diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/Kconfig | 110 | ||||
| -rw-r--r-- | drivers/iommu/Makefile | 5 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 2810 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_init.c | 1574 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_proto.h | 54 | ||||
| -rw-r--r-- | drivers/iommu/amd_iommu_types.h | 585 | ||||
| -rw-r--r-- | drivers/iommu/dmar.c | 1461 | ||||
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 4016 | ||||
| -rw-r--r-- | drivers/iommu/intr_remapping.c | 797 | ||||
| -rw-r--r-- | drivers/iommu/intr_remapping.h | 17 | ||||
| -rw-r--r-- | drivers/iommu/iommu.c | 124 | ||||
| -rw-r--r-- | drivers/iommu/iova.c | 435 | ||||
| -rw-r--r-- | drivers/iommu/msm_iommu.c | 731 | ||||
| -rw-r--r-- | drivers/iommu/msm_iommu_dev.c | 422 |
14 files changed, 13141 insertions, 0 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig new file mode 100644 index 00000000000..b57b3fa492f --- /dev/null +++ b/drivers/iommu/Kconfig @@ -0,0 +1,110 @@ +# IOMMU_API always gets selected by whoever wants it. +config IOMMU_API + bool + +menuconfig IOMMU_SUPPORT + bool "IOMMU Hardware Support" + default y + ---help--- + Say Y here if you want to compile device drivers for IO Memory + Management Units into the kernel. These devices usually allow to + remap DMA requests and/or remap interrupts from other devices on the + system. + +if IOMMU_SUPPORT + +# MSM IOMMU support +config MSM_IOMMU + bool "MSM IOMMU Support" + depends on ARCH_MSM8X60 || ARCH_MSM8960 + select IOMMU_API + help + Support for the IOMMUs found on certain Qualcomm SOCs. + These IOMMUs allow virtualization of the address space used by most + cores within the multimedia subsystem. + + If unsure, say N here. + +config IOMMU_PGTABLES_L2 + def_bool y + depends on MSM_IOMMU && MMU && SMP && CPU_DCACHE_DISABLE=n + +# AMD IOMMU support +config AMD_IOMMU + bool "AMD IOMMU support" + select SWIOTLB + select PCI_MSI + select PCI_IOV + select IOMMU_API + depends on X86_64 && PCI && ACPI + ---help--- + With this option you can enable support for AMD IOMMU hardware in + your system. An IOMMU is a hardware component which provides + remapping of DMA memory accesses from devices. With an AMD IOMMU you + can isolate the the DMA memory of different devices and protect the + system from misbehaving device drivers or hardware. + + You can find out if your system has an AMD IOMMU if you look into + your BIOS for an option to enable it or if you have an IVRS ACPI + table. + +config AMD_IOMMU_STATS + bool "Export AMD IOMMU statistics to debugfs" + depends on AMD_IOMMU + select DEBUG_FS + ---help--- + This option enables code in the AMD IOMMU driver to collect various + statistics about whats happening in the driver and exports that + information to userspace via debugfs. + If unsure, say N. + +# Intel IOMMU support +config DMAR + bool "Support for DMA Remapping Devices" + depends on PCI_MSI && ACPI && (X86 || IA64_GENERIC) + select IOMMU_API + help + DMA remapping (DMAR) devices support enables independent address + translations for Direct Memory Access (DMA) from devices. + These DMA remapping devices are reported via ACPI tables + and include PCI device scope covered by these DMA + remapping devices. + +config DMAR_DEFAULT_ON + def_bool y + prompt "Enable DMA Remapping Devices by default" + depends on DMAR + help + Selecting this option will enable a DMAR device at boot time if + one is found. If this option is not selected, DMAR support can + be enabled by passing intel_iommu=on to the kernel. + +config DMAR_BROKEN_GFX_WA + bool "Workaround broken graphics drivers (going away soon)" + depends on DMAR && BROKEN && X86 + ---help--- + Current Graphics drivers tend to use physical address + for DMA and avoid using DMA APIs. Setting this config + option permits the IOMMU driver to set a unity map for + all the OS-visible memory. Hence the driver can continue + to use physical addresses for DMA, at least until this + option is removed in the 2.6.32 kernel. + +config DMAR_FLOPPY_WA + def_bool y + depends on DMAR && X86 + ---help--- + Floppy disk drivers are known to bypass DMA API calls + thereby failing to work when IOMMU is enabled. This + workaround will setup a 1:1 mapping for the first + 16MiB to make floppy (an ISA device) work. + +config INTR_REMAP + bool "Support for Interrupt Remapping (EXPERIMENTAL)" + depends on X86_64 && X86_IO_APIC && PCI_MSI && ACPI && EXPERIMENTAL + ---help--- + Supports Interrupt remapping for IO-APIC and MSI devices. + To use x2apic mode in the CPU's which support x2APIC enhancements or + to support platforms with CPU's having > 8 bit APIC ID, say Y. + +endif # IOMMU_SUPPORT diff --git a/drivers/iommu/Makefile b/drivers/iommu/Makefile new file mode 100644 index 00000000000..4d4d77df7ca --- /dev/null +++ b/drivers/iommu/Makefile @@ -0,0 +1,5 @@ +obj-$(CONFIG_IOMMU_API) += iommu.o +obj-$(CONFIG_MSM_IOMMU) += msm_iommu.o msm_iommu_dev.o +obj-$(CONFIG_AMD_IOMMU) += amd_iommu.o amd_iommu_init.o +obj-$(CONFIG_DMAR) += dmar.o iova.o intel-iommu.o +obj-$(CONFIG_INTR_REMAP) += dmar.o intr_remapping.o diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c new file mode 100644 index 00000000000..748eab06385 --- /dev/null +++ b/drivers/iommu/amd_iommu.c @@ -0,0 +1,2810 @@ +/* + * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. + * Author: Joerg Roedel <joerg.roedel@amd.com> + * Leo Duran <leo.duran@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/pci.h> +#include <linux/pci-ats.h> +#include <linux/bitmap.h> +#include <linux/slab.h> +#include <linux/debugfs.h> +#include <linux/scatterlist.h> +#include <linux/dma-mapping.h> +#include <linux/iommu-helper.h> +#include <linux/iommu.h> +#include <linux/delay.h> +#include <linux/amd-iommu.h> +#include <asm/proto.h> +#include <asm/iommu.h> +#include <asm/gart.h> +#include <asm/dma.h> + +#include "amd_iommu_proto.h" +#include "amd_iommu_types.h" + +#define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28)) + +#define LOOP_TIMEOUT 100000 + +static DEFINE_RWLOCK(amd_iommu_devtable_lock); + +/* A list of preallocated protection domains */ +static LIST_HEAD(iommu_pd_list); +static DEFINE_SPINLOCK(iommu_pd_list_lock); + +/* List of all available dev_data structures */ +static LIST_HEAD(dev_data_list); +static DEFINE_SPINLOCK(dev_data_list_lock); + +/* + * Domain for untranslated devices - only allocated + * if iommu=pt passed on kernel cmd line. + */ +static struct protection_domain *pt_domain; + +static struct iommu_ops amd_iommu_ops; + +/* + * general struct to manage commands send to an IOMMU + */ +struct iommu_cmd { + u32 data[4]; +}; + +static void update_domain(struct protection_domain *domain); + +/**************************************************************************** + * + * Helper functions + * + ****************************************************************************/ + +static struct iommu_dev_data *alloc_dev_data(u16 devid) +{ + struct iommu_dev_data *dev_data; + unsigned long flags; + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return NULL; + + dev_data->devid = devid; + atomic_set(&dev_data->bind, 0); + + spin_lock_irqsave(&dev_data_list_lock, flags); + list_add_tail(&dev_data->dev_data_list, &dev_data_list); + spin_unlock_irqrestore(&dev_data_list_lock, flags); + + return dev_data; +} + +static void free_dev_data(struct iommu_dev_data *dev_data) +{ + unsigned long flags; + + spin_lock_irqsave(&dev_data_list_lock, flags); + list_del(&dev_data->dev_data_list); + spin_unlock_irqrestore(&dev_data_list_lock, flags); + + kfree(dev_data); +} + +static struct iommu_dev_data *search_dev_data(u16 devid) +{ + struct iommu_dev_data *dev_data; + unsigned long flags; + + spin_lock_irqsave(&dev_data_list_lock, flags); + list_for_each_entry(dev_data, &dev_data_list, dev_data_list) { + if (dev_data->devid == devid) + goto out_unlock; + } + + dev_data = NULL; + +out_unlock: + spin_unlock_irqrestore(&dev_data_list_lock, flags); + + return dev_data; +} + +static struct iommu_dev_data *find_dev_data(u16 devid) +{ + struct iommu_dev_data *dev_data; + + dev_data = search_dev_data(devid); + + if (dev_data == NULL) + dev_data = alloc_dev_data(devid); + + return dev_data; +} + +static inline u16 get_device_id(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return calc_devid(pdev->bus->number, pdev->devfn); +} + +static struct iommu_dev_data *get_dev_data(struct device *dev) +{ + return dev->archdata.iommu; +} + +/* + * In this function the list of preallocated protection domains is traversed to + * find the domain for a specific device + */ +static struct dma_ops_domain *find_protection_domain(u16 devid) +{ + struct dma_ops_domain *entry, *ret = NULL; + unsigned long flags; + u16 alias = amd_iommu_alias_table[devid]; + + if (list_empty(&iommu_pd_list)) + return NULL; + + spin_lock_irqsave(&iommu_pd_list_lock, flags); + + list_for_each_entry(entry, &iommu_pd_list, list) { + if (entry->target_dev == devid || + entry->target_dev == alias) { + ret = entry; + break; + } + } + + spin_unlock_irqrestore(&iommu_pd_list_lock, flags); + + return ret; +} + +/* + * This function checks if the driver got a valid device from the caller to + * avoid dereferencing invalid pointers. + */ +static bool check_device(struct device *dev) +{ + u16 devid; + + if (!dev || !dev->dma_mask) + return false; + + /* No device or no PCI device */ + if (dev->bus != &pci_bus_type) + return false; + + devid = get_device_id(dev); + + /* Out of our scope? */ + if (devid > amd_iommu_last_bdf) + return false; + + if (amd_iommu_rlookup_table[devid] == NULL) + return false; + + return true; +} + +static int iommu_init_device(struct device *dev) +{ + struct iommu_dev_data *dev_data; + u16 alias; + + if (dev->archdata.iommu) + return 0; + + dev_data = find_dev_data(get_device_id(dev)); + if (!dev_data) + return -ENOMEM; + + alias = amd_iommu_alias_table[dev_data->devid]; + if (alias != dev_data->devid) { + struct iommu_dev_data *alias_data; + + alias_data = find_dev_data(alias); + if (alias_data == NULL) { + pr_err("AMD-Vi: Warning: Unhandled device %s\n", + dev_name(dev)); + free_dev_data(dev_data); + return -ENOTSUPP; + } + dev_data->alias_data = alias_data; + } + + dev->archdata.iommu = dev_data; + + return 0; +} + +static void iommu_ignore_device(struct device *dev) +{ + u16 devid, alias; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + + memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry)); + memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry)); + + amd_iommu_rlookup_table[devid] = NULL; + amd_iommu_rlookup_table[alias] = NULL; +} + +static void iommu_uninit_device(struct device *dev) +{ + /* + * Nothing to do here - we keep dev_data around for unplugged devices + * and reuse it when the device is re-plugged - not doing so would + * introduce a ton of races. + */ +} + +void __init amd_iommu_uninit_devices(void) +{ + struct iommu_dev_data *dev_data, *n; + struct pci_dev *pdev = NULL; + + for_each_pci_dev(pdev) { + + if (!check_device(&pdev->dev)) + continue; + + iommu_uninit_device(&pdev->dev); + } + + /* Free all of our dev_data structures */ + list_for_each_entry_safe(dev_data, n, &dev_data_list, dev_data_list) + free_dev_data(dev_data); +} + +int __init amd_iommu_init_devices(void) +{ + struct pci_dev *pdev = NULL; + int ret = 0; + + for_each_pci_dev(pdev) { + + if (!check_device(&pdev->dev)) + continue; + + ret = iommu_init_device(&pdev->dev); + if (ret == -ENOTSUPP) + iommu_ignore_device(&pdev->dev); + else if (ret) + goto out_free; + } + + return 0; + +out_free: + + amd_iommu_uninit_devices(); + + return ret; +} +#ifdef CONFIG_AMD_IOMMU_STATS + +/* + * Initialization code for statistics collection + */ + +DECLARE_STATS_COUNTER(compl_wait); +DECLARE_STATS_COUNTER(cnt_map_single); +DECLARE_STATS_COUNTER(cnt_unmap_single); +DECLARE_STATS_COUNTER(cnt_map_sg); +DECLARE_STATS_COUNTER(cnt_unmap_sg); +DECLARE_STATS_COUNTER(cnt_alloc_coherent); +DECLARE_STATS_COUNTER(cnt_free_coherent); +DECLARE_STATS_COUNTER(cross_page); +DECLARE_STATS_COUNTER(domain_flush_single); +DECLARE_STATS_COUNTER(domain_flush_all); +DECLARE_STATS_COUNTER(alloced_io_mem); +DECLARE_STATS_COUNTER(total_map_requests); + +static struct dentry *stats_dir; +static struct dentry *de_fflush; + +static void amd_iommu_stats_add(struct __iommu_counter *cnt) +{ + if (stats_dir == NULL) + return; + + cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir, + &cnt->value); +} + +static void amd_iommu_stats_init(void) +{ + stats_dir = debugfs_create_dir("amd-iommu", NULL); + if (stats_dir == NULL) + return; + + de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, + (u32 *)&amd_iommu_unmap_flush); + + amd_iommu_stats_add(&compl_wait); + amd_iommu_stats_add(&cnt_map_single); + amd_iommu_stats_add(&cnt_unmap_single); + amd_iommu_stats_add(&cnt_map_sg); + amd_iommu_stats_add(&cnt_unmap_sg); + amd_iommu_stats_add(&cnt_alloc_coherent); + amd_iommu_stats_add(&cnt_free_coherent); + amd_iommu_stats_add(&cross_page); + amd_iommu_stats_add(&domain_flush_single); + amd_iommu_stats_add(&domain_flush_all); + amd_iommu_stats_add(&alloced_io_mem); + amd_iommu_stats_add(&total_map_requests); +} + +#endif + +/**************************************************************************** + * + * Interrupt handling functions + * + ****************************************************************************/ + +static void dump_dte_entry(u16 devid) +{ + int i; + + for (i = 0; i < 8; ++i) + pr_err("AMD-Vi: DTE[%d]: %08x\n", i, + amd_iommu_dev_table[devid].data[i]); +} + +static void dump_command(unsigned long phys_addr) +{ + struct iommu_cmd *cmd = phys_to_virt(phys_addr); + int i; + + for (i = 0; i < 4; ++i) + pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]); +} + +static void iommu_print_event(struct amd_iommu *iommu, void *__evt) +{ + u32 *event = __evt; + int type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK; + int devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK; + int domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK; + int flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK; + u64 address = (u64)(((u64)event[3]) << 32) | event[2]; + + printk(KERN_ERR "AMD-Vi: Event logged ["); + + switch (type) { + case EVENT_TYPE_ILL_DEV: + printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x " + "address=0x%016llx flags=0x%04x]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + address, flags); + dump_dte_entry(devid); + break; + case EVENT_TYPE_IO_FAULT: + printk("IO_PAGE_FAULT device=%02x:%02x.%x " + "domain=0x%04x address=0x%016llx flags=0x%04x]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + domid, address, flags); + break; + case EVENT_TYPE_DEV_TAB_ERR: + printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x " + "address=0x%016llx flags=0x%04x]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + address, flags); + break; + case EVENT_TYPE_PAGE_TAB_ERR: + printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x " + "domain=0x%04x address=0x%016llx flags=0x%04x]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + domid, address, flags); + break; + case EVENT_TYPE_ILL_CMD: + printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); + dump_command(address); + break; + case EVENT_TYPE_CMD_HARD_ERR: + printk("COMMAND_HARDWARE_ERROR address=0x%016llx " + "flags=0x%04x]\n", address, flags); + break; + case EVENT_TYPE_IOTLB_INV_TO: + printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x " + "address=0x%016llx]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + address); + break; + case EVENT_TYPE_INV_DEV_REQ: + printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x " + "address=0x%016llx flags=0x%04x]\n", + PCI_BUS(devid), PCI_SLOT(devid), PCI_FUNC(devid), + address, flags); + break; + default: + printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type); + } +} + +static void iommu_poll_events(struct amd_iommu *iommu) +{ + u32 head, tail; + unsigned long flags; + + spin_lock_irqsave(&iommu->lock, flags); + + head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); + tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); + + while (head != tail) { + iommu_print_event(iommu, iommu->evt_buf + head); + head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size; + } + + writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); + + spin_unlock_irqrestore(&iommu->lock, flags); +} + +irqreturn_t amd_iommu_int_thread(int irq, void *data) +{ + struct amd_iommu *iommu; + + for_each_iommu(iommu) + iommu_poll_events(iommu); + + return IRQ_HANDLED; +} + +irqreturn_t amd_iommu_int_handler(int irq, void *data) +{ + return IRQ_WAKE_THREAD; +} + +/**************************************************************************** + * + * IOMMU command queuing functions + * + ****************************************************************************/ + +static int wait_on_sem(volatile u64 *sem) +{ + int i = 0; + + while (*sem == 0 && i < LOOP_TIMEOUT) { + udelay(1); + i += 1; + } + + if (i == LOOP_TIMEOUT) { + pr_alert("AMD-Vi: Completion-Wait loop timed out\n"); + return -EIO; + } + + return 0; +} + +static void copy_cmd_to_buffer(struct amd_iommu *iommu, + struct iommu_cmd *cmd, + u32 tail) +{ + u8 *target; + + target = iommu->cmd_buf + tail; + tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; + + /* Copy command to buffer */ + memcpy(target, cmd, sizeof(*cmd)); + + /* Tell the IOMMU about it */ + writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); +} + +static void build_completion_wait(struct iommu_cmd *cmd, u64 address) +{ + WARN_ON(address & 0x7ULL); + + memset(cmd, 0, sizeof(*cmd)); + cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK; + cmd->data[1] = upper_32_bits(__pa(address)); + cmd->data[2] = 1; + CMD_SET_TYPE(cmd, CMD_COMPL_WAIT); +} + +static void build_inv_dte(struct iommu_cmd *cmd, u16 devid) +{ + memset(cmd, 0, sizeof(*cmd)); + cmd->data[0] = devid; + CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY); +} + +static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, + size_t size, u16 domid, int pde) +{ + u64 pages; + int s; + + pages = iommu_num_pages(address, size, PAGE_SIZE); + s = 0; + + if (pages > 1) { + /* + * If we have to flush more than one page, flush all + * TLB entries for this domain + */ + address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; + s = 1; + } + + address &= PAGE_MASK; + + memset(cmd, 0, sizeof(*cmd)); + cmd->data[1] |= domid; + cmd->data[2] = lower_32_bits(address); + cmd->data[3] = upper_32_bits(address); + CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES); + if (s) /* size bit - we flush more than one 4kb page */ + cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; + if (pde) /* PDE bit - we wan't flush everything not only the PTEs */ + cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK; +} + +static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep, + u64 address, size_t size) +{ + u64 pages; + int s; + + pages = iommu_num_pages(address, size, PAGE_SIZE); + s = 0; + + if (pages > 1) { + /* + * If we have to flush more than one page, flush all + * TLB entries for this domain + */ + address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; + s = 1; + } + + address &= PAGE_MASK; + + memset(cmd, 0, sizeof(*cmd)); + cmd->data[0] = devid; + cmd->data[0] |= (qdep & 0xff) << 24; + cmd->data[1] = devid; + cmd->data[2] = lower_32_bits(address); + cmd->data[3] = upper_32_bits(address); + CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES); + if (s) + cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK; +} + +static void build_inv_all(struct iommu_cmd *cmd) +{ + memset(cmd, 0, sizeof(*cmd)); + CMD_SET_TYPE(cmd, CMD_INV_ALL); +} + +/* + * Writes the command to the IOMMUs command buffer and informs the + * hardware about the new command. + */ +static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd) +{ + u32 left, tail, head, next_tail; + unsigned long flags; + + WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED); + +again: + spin_lock_irqsave(&iommu->lock, flags); + + head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); + tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); + next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size; + left = (head - next_tail) % iommu->cmd_buf_size; + + if (left <= 2) { + struct iommu_cmd sync_cmd; + volatile u64 sem = 0; + int ret; + + build_completion_wait(&sync_cmd, (u64)&sem); + copy_cmd_to_buffer(iommu, &sync_cmd, tail); + + spin_unlock_irqrestore(&iommu->lock, flags); + + if ((ret = wait_on_sem(&sem)) != 0) + return ret; + + goto again; + } + + copy_cmd_to_buffer(iommu, cmd, tail); + + /* We need to sync now to make sure all commands are processed */ + iommu->need_sync = true; + + spin_unlock_irqrestore(&iommu->lock, flags); + + return 0; +} + +/* + * This function queues a completion wait command into the command + * buffer of an IOMMU + */ +static int iommu_completion_wait(struct amd_iommu *iommu) +{ + struct iommu_cmd cmd; + volatile u64 sem = 0; + int ret; + + if (!iommu->need_sync) + return 0; + + build_completion_wait(&cmd, (u64)&sem); + + ret = iommu_queue_command(iommu, &cmd); + if (ret) + return ret; + + return wait_on_sem(&sem); +} + +static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid) +{ + struct iommu_cmd cmd; + + build_inv_dte(&cmd, devid); + + return iommu_queue_command(iommu, &cmd); +} + +static void iommu_flush_dte_all(struct amd_iommu *iommu) +{ + u32 devid; + + for (devid = 0; devid <= 0xffff; ++devid) + iommu_flush_dte(iommu, devid); + + iommu_completion_wait(iommu); +} + +/* + * This function uses heavy locking and may disable irqs for some time. But + * this is no issue because it is only called during resume. + */ +static void iommu_flush_tlb_all(struct amd_iommu *iommu) +{ + u32 dom_id; + + for (dom_id = 0; dom_id <= 0xffff; ++dom_id) { + struct iommu_cmd cmd; + build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, + dom_id, 1); + iommu_queue_command(iommu, &cmd); + } + + iommu_completion_wait(iommu); +} + +static void iommu_flush_all(struct amd_iommu *iommu) +{ + struct iommu_cmd cmd; + + build_inv_all(&cmd); + + iommu_queue_command(iommu, &cmd); + iommu_completion_wait(iommu); +} + +void iommu_flush_all_caches(struct amd_iommu *iommu) +{ + if (iommu_feature(iommu, FEATURE_IA)) { + iommu_flush_all(iommu); + } else { + iommu_flush_dte_all(iommu); + iommu_flush_tlb_all(iommu); + } +} + +/* + * Command send function for flushing on-device TLB + */ +static int device_flush_iotlb(struct iommu_dev_data *dev_data, + u64 address, size_t size) +{ + struct amd_iommu *iommu; + struct iommu_cmd cmd; + int qdep; + + qdep = dev_data->ats.qdep; + iommu = amd_iommu_rlookup_table[dev_data->devid]; + + build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size); + + return iommu_queue_command(iommu, &cmd); +} + +/* + * Command send function for invalidating a device table entry + */ +static int device_flush_dte(struct iommu_dev_data *dev_data) +{ + struct amd_iommu *iommu; + int ret; + + iommu = amd_iommu_rlookup_table[dev_data->devid]; + + ret = iommu_flush_dte(iommu, dev_data->devid); + if (ret) + return ret; + + if (dev_data->ats.enabled) + ret = device_flush_iotlb(dev_data, 0, ~0UL); + + return ret; +} + +/* + * TLB invalidation function which is called from the mapping functions. + * It invalidates a single PTE if the range to flush is within a single + * page. Otherwise it flushes the whole TLB of the IOMMU. + */ +static void __domain_flush_pages(struct protection_domain *domain, + u64 address, size_t size, int pde) +{ + struct iommu_dev_data *dev_data; + struct iommu_cmd cmd; + int ret = 0, i; + + build_inv_iommu_pages(&cmd, address, size, domain->id, pde); + + for (i = 0; i < amd_iommus_present; ++i) { + if (!domain->dev_iommu[i]) + continue; + + /* + * Devices of this domain are behind this IOMMU + * We need a TLB flush + */ + ret |= iommu_queue_command(amd_iommus[i], &cmd); + } + + list_for_each_entry(dev_data, &domain->dev_list, list) { + + if (!dev_data->ats.enabled) + continue; + + ret |= device_flush_iotlb(dev_data, address, size); + } + + WARN_ON(ret); +} + +static void domain_flush_pages(struct protection_domain *domain, + u64 address, size_t size) +{ + __domain_flush_pages(domain, address, size, 0); +} + +/* Flush the whole IO/TLB for a given protection domain */ +static void domain_flush_tlb(struct protection_domain *domain) +{ + __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0); +} + +/* Flush the whole IO/TLB for a given protection domain - including PDE */ +static void domain_flush_tlb_pde(struct protection_domain *domain) +{ + __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); +} + +static void domain_flush_complete(struct protection_domain *domain) +{ + int i; + + for (i = 0; i < amd_iommus_present; ++i) { + if (!domain->dev_iommu[i]) + continue; + + /* + * Devices of this domain are behind this IOMMU + * We need to wait for completion of all commands. + */ + iommu_completion_wait(amd_iommus[i]); + } +} + + +/* + * This function flushes the DTEs for all devices in domain + */ +static void domain_flush_devices(struct protection_domain *domain) +{ + struct iommu_dev_data *dev_data; + unsigned long flags; + + spin_lock_irqsave(&domain->lock, flags); + + list_for_each_entry(dev_data, &domain->dev_list, list) + device_flush_dte(dev_data); + + spin_unlock_irqrestore(&domain->lock, flags); +} + +/**************************************************************************** + * + * The functions below are used the create the page table mappings for + * unity mapped regions. + * + ****************************************************************************/ + +/* + * This function is used to add another level to an IO page table. Adding + * another level increases the size of the address space by 9 bits to a size up + * to 64 bits. + */ +static bool increase_address_space(struct protection_domain *domain, + gfp_t gfp) +{ + u64 *pte; + + if (domain->mode == PAGE_MODE_6_LEVEL) + /* address space already 64 bit large */ + return false; + + pte = (void *)get_zeroed_page(gfp); + if (!pte) + return false; + + *pte = PM_LEVEL_PDE(domain->mode, + virt_to_phys(domain->pt_root)); + domain->pt_root = pte; + domain->mode += 1; + domain->updated = true; + + return true; +} + +static u64 *alloc_pte(struct protection_domain *domain, + unsigned long address, + unsigned long page_size, + u64 **pte_page, + gfp_t gfp) +{ + int level, end_lvl; + u64 *pte, *page; + + BUG_ON(!is_power_of_2(page_size)); + + while (address > PM_LEVEL_SIZE(domain->mode)) + increase_address_space(domain, gfp); + + level = domain->mode - 1; + pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; + address = PAGE_SIZE_ALIGN(address, page_size); + end_lvl = PAGE_SIZE_LEVEL(page_size); + + while (level > end_lvl) { + if (!IOMMU_PTE_PRESENT(*pte)) { + page = (u64 *)get_zeroed_page(gfp); + if (!page) + return NULL; + *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); + } + + /* No level skipping support yet */ + if (PM_PTE_LEVEL(*pte) != level) + return NULL; + + level -= 1; + + pte = IOMMU_PTE_PAGE(*pte); + + if (pte_page && level == end_lvl) + *pte_page = pte; + + pte = &pte[PM_LEVEL_INDEX(level, address)]; + } + + return pte; +} + +/* + * This function checks if there is a PTE for a given dma address. If + * there is one, it returns the pointer to it. + */ +static u64 *fetch_pte(struct protection_domain *domain, unsigned long address) +{ + int level; + u64 *pte; + + if (address > PM_LEVEL_SIZE(domain->mode)) + return NULL; + + level = domain->mode - 1; + pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; + + while (level > 0) { + + /* Not Present */ + if (!IOMMU_PTE_PRESENT(*pte)) + return NULL; + + /* Large PTE */ + if (PM_PTE_LEVEL(*pte) == 0x07) { + unsigned long pte_mask, __pte; + + /* + * If we have a series of large PTEs, make + * sure to return a pointer to the first one. + */ + pte_mask = PTE_PAGE_SIZE(*pte); + pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1); + __pte = ((unsigned long)pte) & pte_mask; + + return (u64 *)__pte; + } + + /* No level skipping support yet */ + if (PM_PTE_LEVEL(*pte) != level) + return NULL; + + level -= 1; + + /* Walk to the next level */ + pte = IOMMU_PTE_PAGE(*pte); + pte = &pte[PM_LEVEL_INDEX(level, address)]; + } + + return pte; +} + +/* + * Generic mapping functions. It maps a physical address into a DMA + * address space. It allocates the page table pages if necessary. + * In the future it can be extended to a generic mapping function + * supporting all features of AMD IOMMU page tables like level skipping + * and full 64 bit address spaces. + */ +static int iommu_map_page(struct protection_domain *dom, + unsigned long bus_addr, + unsigned long phys_addr, + int prot, + unsigned long page_size) +{ + u64 __pte, *pte; + int i, count; + + if (!(prot & IOMMU_PROT_MASK)) + return -EINVAL; + + bus_addr = PAGE_ALIGN(bus_addr); + phys_addr = PAGE_ALIGN(phys_addr); + count = PAGE_SIZE_PTE_COUNT(page_size); + pte = alloc_pte(dom, bus_addr, page_size, NULL, GFP_KERNEL); + + for (i = 0; i < count; ++i) + if (IOMMU_PTE_PRESENT(pte[i])) + return -EBUSY; + + if (page_size > PAGE_SIZE) { + __pte = PAGE_SIZE_PTE(phys_addr, page_size); + __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC; + } else + __pte = phys_addr | IOMMU_PTE_P | IOMMU_PTE_FC; + + if (prot & IOMMU_PROT_IR) + __pte |= IOMMU_PTE_IR; + if (prot & IOMMU_PROT_IW) + __pte |= IOMMU_PTE_IW; + + for (i = 0; i < count; ++i) + pte[i] = __pte; + + update_domain(dom); + + return 0; +} + +static unsigned long iommu_unmap_page(struct protection_domain *dom, + unsigned long bus_addr, + unsigned long page_size) +{ + unsigned long long unmap_size, unmapped; + u64 *pte; + + BUG_ON(!is_power_of_2(page_size)); + + unmapped = 0; + + while (unmapped < page_size) { + + pte = fetch_pte(dom, bus_addr); + + if (!pte) { + /* + * No PTE for this address + * move forward in 4kb steps + */ + unmap_size = PAGE_SIZE; + } else if (PM_PTE_LEVEL(*pte) == 0) { + /* 4kb PTE found for this address */ + unmap_size = PAGE_SIZE; + *pte = 0ULL; + } else { + int count, i; + + /* Large PTE found which maps this address */ + unmap_size = PTE_PAGE_SIZE(*pte); + count = PAGE_SIZE_PTE_COUNT(unmap_size); + for (i = 0; i < count; i++) + pte[i] = 0ULL; + } + + bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size; + unmapped += unmap_size; + } + + BUG_ON(!is_power_of_2(unmapped)); + + return unmapped; +} + +/* + * This function checks if a specific unity mapping entry is needed for + * this specific IOMMU. + */ +static int iommu_for_unity_map(struct amd_iommu *iommu, + struct unity_map_entry *entry) +{ + u16 bdf, i; + + for (i = entry->devid_start; i <= entry->devid_end; ++i) { + bdf = amd_iommu_alias_table[i]; + if (amd_iommu_rlookup_table[bdf] == iommu) + return 1; + } + + return 0; +} + +/* + * This function actually applies the mapping to the page table of the + * dma_ops domain. + */ +static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, + struct unity_map_entry *e) +{ + u64 addr; + int ret; + + for (addr = e->address_start; addr < e->address_end; + addr += PAGE_SIZE) { + ret = iommu_map_page(&dma_dom->domain, addr, addr, e->prot, + PAGE_SIZE); + if (ret) + return ret; + /* + * if unity mapping is in aperture range mark the page + * as allocated in the aperture + */ + if (addr < dma_dom->aperture_size) + __set_bit(addr >> PAGE_SHIFT, + dma_dom->aperture[0]->bitmap); + } + + return 0; +} + +/* + * Init the unity mappings for a specific IOMMU in the system + * + * Basically iterates over all unity mapping entries and applies them to + * the default domain DMA of that IOMMU if necessary. + */ +static int iommu_init_unity_mappings(struct amd_iommu *iommu) +{ + struct unity_map_entry *entry; + int ret; + + list_for_each_entry(entry, &amd_iommu_unity_map, list) { + if (!iommu_for_unity_map(iommu, entry)) + continue; + ret = dma_ops_unity_map(iommu->default_dom, entry); + if (ret) + return ret; + } + + return 0; +} + +/* + * Inits the unity mappings required for a specific device + */ +static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, + u16 devid) +{ + struct unity_map_entry *e; + int ret; + + list_for_each_entry(e, &amd_iommu_unity_map, list) { + if (!(devid >= e->devid_start && devid <= e->devid_end)) + continue; + ret = dma_ops_unity_map(dma_dom, e); + if (ret) + return ret; + } + + return 0; +} + +/**************************************************************************** + * + * The next functions belong to the address allocator for the dma_ops + * interface functions. They work like the allocators in the other IOMMU + * drivers. Its basically a bitmap which marks the allocated pages in + * the aperture. Maybe it could be enhanced in the future to a more + * efficient allocator. + * + ****************************************************************************/ + +/* + * The address allocator core functions. + * + * called with domain->lock held + */ + +/* + * Used to reserve address ranges in the aperture (e.g. for exclusion + * ranges. + */ +static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, + unsigned long start_page, + unsigned int pages) +{ + unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; + + if (start_page + pages > last_page) + pages = last_page - start_page; + + for (i = start_page; i < start_page + pages; ++i) { + int index = i / APERTURE_RANGE_PAGES; + int page = i % APERTURE_RANGE_PAGES; + __set_bit(page, dom->aperture[index]->bitmap); + } +} + +/* + * This function is used to add a new aperture range to an existing + * aperture in case of dma_ops domain allocation or address allocation + * failure. + */ +static int alloc_new_range(struct dma_ops_domain *dma_dom, + bool populate, gfp_t gfp) +{ + int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; + struct amd_iommu *iommu; + unsigned long i; + +#ifdef CONFIG_IOMMU_STRESS + populate = false; +#endif + + if (index >= APERTURE_MAX_RANGES) + return -ENOMEM; + + dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); + if (!dma_dom->aperture[index]) + return -ENOMEM; + + dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); + if (!dma_dom->aperture[index]->bitmap) + goto out_free; + + dma_dom->aperture[index]->offset = dma_dom->aperture_size; + + if (populate) { + unsigned long address = dma_dom->aperture_size; + int i, num_ptes = APERTURE_RANGE_PAGES / 512; + u64 *pte, *pte_page; + + for (i = 0; i < num_ptes; ++i) { + pte = alloc_pte(&dma_dom->domain, address, PAGE_SIZE, + &pte_page, gfp); + if (!pte) + goto out_free; + + dma_dom->aperture[index]->pte_pages[i] = pte_page; + + address += APERTURE_RANGE_SIZE / 64; + } + } + + dma_dom->aperture_size += APERTURE_RANGE_SIZE; + + /* Initialize the exclusion range if necessary */ + for_each_iommu(iommu) { + if (iommu->exclusion_start && + iommu->exclusion_start >= dma_dom->aperture[index]->offset + && iommu->exclusion_start < dma_dom->aperture_size) { + unsigned long startpage; + int pages = iommu_num_pages(iommu->exclusion_start, + iommu->exclusion_length, + PAGE_SIZE); + startpage = iommu->exclusion_start >> PAGE_SHIFT; + dma_ops_reserve_addresses(dma_dom, startpage, pages); + } + } + + /* + * Check for areas already mapped as present in the new aperture + * range and mark those pages as reserved in the allocator. Such + * mappings may already exist as a result of requested unity + * mappings for devices. + */ + for (i = dma_dom->aperture[index]->offset; + i < dma_dom->aperture_size; + i += PAGE_SIZE) { + u64 *pte = fetch_pte(&dma_dom->domain, i); + if (!pte || !IOMMU_PTE_PRESENT(*pte)) + continue; + + dma_ops_reserve_addresses(dma_dom, i << PAGE_SHIFT, 1); + } + + update_domain(&dma_dom->domain); + + return 0; + +out_free: + update_domain(&dma_dom->domain); + + free_page((unsigned long)dma_dom->aperture[index]->bitmap); + + kfree(dma_dom->aperture[index]); + dma_dom->aperture[index] = NULL; + + return -ENOMEM; +} + +static unsigned long dma_ops_area_alloc(struct device *dev, + struct dma_ops_domain *dom, + unsigned int pages, + unsigned long align_mask, + u64 dma_mask, + unsigned long start) +{ + unsigned long next_bit = dom->next_address % APERTURE_RANGE_SIZE; + int max_index = dom->aperture_size >> APERTURE_RANGE_SHIFT; + int i = start >> APERTURE_RANGE_SHIFT; + unsigned long boundary_size; + unsigned long address = -1; + unsigned long limit; + + next_bit >>= PAGE_SHIFT; + + boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, + PAGE_SIZE) >> PAGE_SHIFT; + + for (;i < max_index; ++i) { + unsigned long offset = dom->aperture[i]->offset >> PAGE_SHIFT; + + if (dom->aperture[i]->offset >= dma_mask) + break; + + limit = iommu_device_max_index(APERTURE_RANGE_PAGES, offset, + dma_mask >> PAGE_SHIFT); + + address = iommu_area_alloc(dom->aperture[i]->bitmap, + limit, next_bit, pages, 0, + boundary_size, align_mask); + if (address != -1) { + address = dom->aperture[i]->offset + + (address << PAGE_SHIFT); + dom->next_address = address + (pages << PAGE_SHIFT); + break; + } + + next_bit = 0; + } + + return address; +} + +static unsigned long dma_ops_alloc_addresses(struct device *dev, + struct dma_ops_domain *dom, + unsigned int pages, + unsigned long align_mask, + u64 dma_mask) +{ + unsigned long address; + +#ifdef CONFIG_IOMMU_STRESS + dom->next_address = 0; + dom->need_flush = true; +#endif + + address = dma_ops_area_alloc(dev, dom, pages, align_mask, + dma_mask, dom->next_address); + + if (address == -1) { + dom->next_address = 0; + address = dma_ops_area_alloc(dev, dom, pages, align_mask, + dma_mask, 0); + dom->need_flush = true; + } + + if (unlikely(address == -1)) + address = DMA_ERROR_CODE; + + WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); + + return address; +} + +/* + * The address free function. + * + * called with domain->lock held + */ +static void dma_ops_free_addresses(struct dma_ops_domain *dom, + unsigned long address, + unsigned int pages) +{ + unsigned i = address >> APERTURE_RANGE_SHIFT; + struct aperture_range *range = dom->aperture[i]; + + BUG_ON(i >= APERTURE_MAX_RANGES || range == NULL); + +#ifdef CONFIG_IOMMU_STRESS + if (i < 4) + return; +#endif + + if (address >= dom->next_address) + dom->need_flush = true; + + address = (address % APERTURE_RANGE_SIZE) >> PAGE_SHIFT; + + bitmap_clear(range->bitmap, address, pages); + +} + +/**************************************************************************** + * + * The next functions belong to the domain allocation. A domain is + * allocated for every IOMMU as the default domain. If device isolation + * is enabled, every device get its own domain. The most important thing + * about domains is the page table mapping the DMA address space they + * contain. + * + ****************************************************************************/ + +/* + * This function adds a protection domain to the global protection domain list + */ +static void add_domain_to_list(struct protection_domain *domain) +{ + unsigned long flags; + + spin_lock_irqsave(&amd_iommu_pd_lock, flags); + list_add(&domain->list, &amd_iommu_pd_list); + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); +} + +/* + * This function removes a protection domain to the global + * protection domain list + */ +static void del_domain_from_list(struct protection_domain *domain) +{ + unsigned long flags; + + spin_lock_irqsave(&amd_iommu_pd_lock, flags); + list_del(&domain->list); + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); +} + +static u16 domain_id_alloc(void) +{ + unsigned long flags; + int id; + + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID); + BUG_ON(id == 0); + if (id > 0 && id < MAX_DOMAIN_ID) + __set_bit(id, amd_iommu_pd_alloc_bitmap); + else + id = 0; + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + + return id; +} + +static void domain_id_free(int id) +{ + unsigned long flags; + + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + if (id > 0 && id < MAX_DOMAIN_ID) + __clear_bit(id, amd_iommu_pd_alloc_bitmap); + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); +} + +static void free_pagetable(struct protection_domain *domain) +{ + int i, j; + u64 *p1, *p2, *p3; + + p1 = domain->pt_root; + + if (!p1) + return; + + for (i = 0; i < 512; ++i) { + if (!IOMMU_PTE_PRESENT(p1[i])) + continue; + + p2 = IOMMU_PTE_PAGE(p1[i]); + for (j = 0; j < 512; ++j) { + if (!IOMMU_PTE_PRESENT(p2[j])) + continue; + p3 = IOMMU_PTE_PAGE(p2[j]); + free_page((unsigned long)p3); + } + + free_page((unsigned long)p2); + } + + free_page((unsigned long)p1); + + domain->pt_root = NULL; +} + +/* + * Free a domain, only used if something went wrong in the + * allocation path and we need to free an already allocated page table + */ +static void dma_ops_domain_free(struct dma_ops_domain *dom) +{ + int i; + + if (!dom) + return; + + del_domain_from_list(&dom->domain); + + free_pagetable(&dom->domain); + + for (i = 0; i < APERTURE_MAX_RANGES; ++i) { + if (!dom->aperture[i]) + continue; + free_page((unsigned long)dom->aperture[i]->bitmap); + kfree(dom->aperture[i]); + } + + kfree(dom); +} + +/* + * Allocates a new protection domain usable for the dma_ops functions. + * It also initializes the page table and the address allocator data + * structures required for the dma_ops interface + */ +static struct dma_ops_domain *dma_ops_domain_alloc(void) +{ + struct dma_ops_domain *dma_dom; + + dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL); + if (!dma_dom) + return NULL; + + spin_lock_init(&dma_dom->domain.lock); + + dma_dom->domain.id = domain_id_alloc(); + if (dma_dom->domain.id == 0) + goto free_dma_dom; + INIT_LIST_HEAD(&dma_dom->domain.dev_list); + dma_dom->domain.mode = PAGE_MODE_2_LEVEL; + dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); + dma_dom->domain.flags = PD_DMA_OPS_MASK; + dma_dom->domain.priv = dma_dom; + if (!dma_dom->domain.pt_root) + goto free_dma_dom; + + dma_dom->need_flush = false; + dma_dom->target_dev = 0xffff; + + add_domain_to_list(&dma_dom->domain); + + if (alloc_new_range(dma_dom, true, GFP_KERNEL)) + goto free_dma_dom; + + /* + * mark the first page as allocated so we never return 0 as + * a valid dma-address. So we can use 0 as error value + */ + dma_dom->aperture[0]->bitmap[0] = 1; + dma_dom->next_address = 0; + + + return dma_dom; + +free_dma_dom: + dma_ops_domain_free(dma_dom); + + return NULL; +} + +/* + * little helper function to check whether a given protection domain is a + * dma_ops domain + */ +static bool dma_ops_domain(struct protection_domain *domain) +{ + return domain->flags & PD_DMA_OPS_MASK; +} + +static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats) +{ + u64 pte_root = virt_to_phys(domain->pt_root); + u32 flags = 0; + + pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK) + << DEV_ENTRY_MODE_SHIFT; + pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV; + + if (ats) + flags |= DTE_FLAG_IOTLB; + + amd_iommu_dev_table[devid].data[3] |= flags; + amd_iommu_dev_table[devid].data[2] = domain->id; + amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); + amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); +} + +static void clear_dte_entry(u16 devid) +{ + /* remove entry from the device table seen by the hardware */ + amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; + amd_iommu_dev_table[devid].data[1] = 0; + amd_iommu_dev_table[devid].data[2] = 0; + + amd_iommu_apply_erratum_63(devid); +} + +static void do_attach(struct iommu_dev_data *dev_data, + struct protection_domain *domain) +{ + struct amd_iommu *iommu; + bool ats; + + iommu = amd_iommu_rlookup_table[dev_data->devid]; + ats = dev_data->ats.enabled; + + /* Update data structures */ + dev_data->domain = domain; + list_add(&dev_data->list, &domain->dev_list); + set_dte_entry(dev_data->devid, domain, ats); + + /* Do reference counting */ + domain->dev_iommu[iommu->index] += 1; + domain->dev_cnt += 1; + + /* Flush the DTE entry */ + device_flush_dte(dev_data); +} + +static void do_detach(struct iommu_dev_data *dev_data) +{ + struct amd_iommu *iommu; + + iommu = amd_iommu_rlookup_table[dev_data->devid]; + + /* decrease reference counters */ + dev_data->domain->dev_iommu[iommu->index] -= 1; + dev_data->domain->dev_cnt -= 1; + + /* Update data structures */ + dev_data->domain = NULL; + list_del(&dev_data->list); + clear_dte_entry(dev_data->devid); + + /* Flush the DTE entry */ + device_flush_dte(dev_data); +} + +/* + * If a device is not yet associated with a domain, this function does + * assigns it visible for the hardware + */ +static int __attach_device(struct iommu_dev_data *dev_data, + struct protection_domain *domain) +{ + int ret; + + /* lock domain */ + spin_lock(&domain->lock); + + if (dev_data->alias_data != NULL) { + struct iommu_dev_data *alias_data = dev_data->alias_data; + + /* Some sanity checks */ + ret = -EBUSY; + if (alias_data->domain != NULL && + alias_data->domain != domain) + goto out_unlock; + + if (dev_data->domain != NULL && + dev_data->domain != domain) + goto out_unlock; + + /* Do real assignment */ + if (alias_data->domain == NULL) + do_attach(alias_data, domain); + + atomic_inc(&alias_data->bind); + } + + if (dev_data->domain == NULL) + do_attach(dev_data, domain); + + atomic_inc(&dev_data->bind); + + ret = 0; + +out_unlock: + + /* ready */ + spin_unlock(&domain->lock); + + return ret; +} + +/* + * If a device is not yet associated with a domain, this function does + * assigns it visible for the hardware + */ +static int attach_device(struct device *dev, + struct protection_domain *domain) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct iommu_dev_data *dev_data; + unsigned long flags; + int ret; + + dev_data = get_dev_data(dev); + + if (amd_iommu_iotlb_sup && pci_enable_ats(pdev, PAGE_SHIFT) == 0) { + dev_data->ats.enabled = true; + dev_data->ats.qdep = pci_ats_queue_depth(pdev); + } + + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + ret = __attach_device(dev_data, domain); + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + + /* + * We might boot into a crash-kernel here. The crashed kernel + * left the caches in the IOMMU dirty. So we have to flush + * here to evict all dirty stuff. + */ + domain_flush_tlb_pde(domain); + + return ret; +} + +/* + * Removes a device from a protection domain (unlocked) + */ +static void __detach_device(struct iommu_dev_data *dev_data) +{ + struct protection_domain *domain; + unsigned long flags; + + BUG_ON(!dev_data->domain); + + domain = dev_data->domain; + + spin_lock_irqsave(&domain->lock, flags); + + if (dev_data->alias_data != NULL) { + struct iommu_dev_data *alias_data = dev_data->alias_data; + + if (atomic_dec_and_test(&alias_data->bind)) + do_detach(alias_data); + } + + if (atomic_dec_and_test(&dev_data->bind)) + do_detach(dev_data); + + spin_unlock_irqrestore(&domain->lock, flags); + + /* + * If we run in passthrough mode the device must be assigned to the + * passthrough domain if it is detached from any other domain. + * Make sure we can deassign from the pt_domain itself. + */ + if (iommu_pass_through && + (dev_data->domain == NULL && domain != pt_domain)) + __attach_device(dev_data, pt_domain); +} + +/* + * Removes a device from a protection domain (with devtable_lock held) + */ +static void detach_device(struct device *dev) +{ + struct iommu_dev_data *dev_data; + unsigned long flags; + + dev_data = get_dev_data(dev); + + /* lock device table */ + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + __detach_device(dev_data); + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + + if (dev_data->ats.enabled) { + pci_disable_ats(to_pci_dev(dev)); + dev_data->ats.enabled = false; + } +} + +/* + * Find out the protection domain structure for a given PCI device. This + * will give us the pointer to the page table root for example. + */ +static struct protection_domain *domain_for_device(struct device *dev) +{ + struct iommu_dev_data *dev_data; + struct protection_domain *dom = NULL; + unsigned long flags; + + dev_data = get_dev_data(dev); + + if (dev_data->domain) + return dev_data->domain; + + if (dev_data->alias_data != NULL) { + struct iommu_dev_data *alias_data = dev_data->alias_data; + + read_lock_irqsave(&amd_iommu_devtable_lock, flags); + if (alias_data->domain != NULL) { + __attach_device(dev_data, alias_data->domain); + dom = alias_data->domain; + } + read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + } + + return dom; +} + +static int device_change_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + u16 devid; + struct protection_domain *domain; + struct dma_ops_domain *dma_domain; + struct amd_iommu *iommu; + unsigned long flags; + + if (!check_device(dev)) + return 0; + + devid = get_device_id(dev); + iommu = amd_iommu_rlookup_table[devid]; + + switch (action) { + case BUS_NOTIFY_UNBOUND_DRIVER: + + domain = domain_for_device(dev); + + if (!domain) + goto out; + if (iommu_pass_through) + break; + detach_device(dev); + break; + case BUS_NOTIFY_ADD_DEVICE: + + iommu_init_device(dev); + + domain = domain_for_device(dev); + + /* allocate a protection domain if a device is added */ + dma_domain = find_protection_domain(devid); + if (dma_domain) + goto out; + dma_domain = dma_ops_domain_alloc(); + if (!dma_domain) + goto out; + dma_domain->target_dev = devid; + + spin_lock_irqsave(&iommu_pd_list_lock, flags); + list_add_tail(&dma_domain->list, &iommu_pd_list); + spin_unlock_irqrestore(&iommu_pd_list_lock, flags); + + break; + case BUS_NOTIFY_DEL_DEVICE: + + iommu_uninit_device(dev); + + default: + goto out; + } + + iommu_completion_wait(iommu); + +out: + return 0; +} + +static struct notifier_block device_nb = { + .notifier_call = device_change_notifier, +}; + +void amd_iommu_init_notifier(void) +{ + bus_register_notifier(&pci_bus_type, &device_nb); +} + +/***************************************************************************** + * + * The next functions belong to the dma_ops mapping/unmapping code. + * + *****************************************************************************/ + +/* + * In the dma_ops path we only have the struct device. This function + * finds the corresponding IOMMU, the protection domain and the + * requestor id for a given device. + * If the device is not yet associated with a domain this is also done + * in this function. + */ +static struct protection_domain *get_domain(struct device *dev) +{ + struct protection_domain *domain; + struct dma_ops_domain *dma_dom; + u16 devid = get_device_id(dev); + + if (!check_device(dev)) + return ERR_PTR(-EINVAL); + + domain = domain_for_device(dev); + if (domain != NULL && !dma_ops_domain(domain)) + return ERR_PTR(-EBUSY); + + if (domain != NULL) + return domain; + + /* Device not bount yet - bind it */ + dma_dom = find_protection_domain(devid); + if (!dma_dom) + dma_dom = amd_iommu_rlookup_table[devid]->default_dom; + attach_device(dev, &dma_dom->domain); + DUMP_printk("Using protection domain %d for device %s\n", + dma_dom->domain.id, dev_name(dev)); + + return &dma_dom->domain; +} + +static void update_device_table(struct protection_domain *domain) +{ + struct iommu_dev_data *dev_data; + + list_for_each_entry(dev_data, &domain->dev_list, list) + set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled); +} + +static void update_domain(struct protection_domain *domain) +{ + if (!domain->updated) + return; + + update_device_table(domain); + + domain_flush_devices(domain); + domain_flush_tlb_pde(domain); + + domain->updated = false; +} + +/* + * This function fetches the PTE for a given address in the aperture + */ +static u64* dma_ops_get_pte(struct dma_ops_domain *dom, + unsigned long address) +{ + struct aperture_range *aperture; + u64 *pte, *pte_page; + + aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; + if (!aperture) + return NULL; + + pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; + if (!pte) { + pte = alloc_pte(&dom->domain, address, PAGE_SIZE, &pte_page, + GFP_ATOMIC); + aperture->pte_pages[APERTURE_PAGE_INDEX(address)] = pte_page; + } else + pte += PM_LEVEL_INDEX(0, address); + + update_domain(&dom->domain); + + return pte; +} + +/* + * This is the generic map function. It maps one 4kb page at paddr to + * the given address in the DMA address space for the domain. + */ +static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom, + unsigned long address, + phys_addr_t paddr, + int direction) +{ + u64 *pte, __pte; + + WARN_ON(address > dom->aperture_size); + + paddr &= PAGE_MASK; + + pte = dma_ops_get_pte(dom, address); + if (!pte) + return DMA_ERROR_CODE; + + __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; + + if (direction == DMA_TO_DEVICE) + __pte |= IOMMU_PTE_IR; + else if (direction == DMA_FROM_DEVICE) + __pte |= IOMMU_PTE_IW; + else if (direction == DMA_BIDIRECTIONAL) + __pte |= IOMMU_PTE_IR | IOMMU_PTE_IW; + + WARN_ON(*pte); + + *pte = __pte; + + return (dma_addr_t)address; +} + +/* + * The generic unmapping function for on page in the DMA address space. + */ +static void dma_ops_domain_unmap(struct dma_ops_domain *dom, + unsigned long address) +{ + struct aperture_range *aperture; + u64 *pte; + + if (address >= dom->aperture_size) + return; + + aperture = dom->aperture[APERTURE_RANGE_INDEX(address)]; + if (!aperture) + return; + + pte = aperture->pte_pages[APERTURE_PAGE_INDEX(address)]; + if (!pte) + return; + + pte += PM_LEVEL_INDEX(0, address); + + WARN_ON(!*pte); + + *pte = 0ULL; +} + +/* + * This function contains common code for mapping of a physically + * contiguous memory region into DMA address space. It is used by all + * mapping functions provided with this IOMMU driver. + * Must be called with the domain lock held. + */ +static dma_addr_t __map_single(struct device *dev, + struct dma_ops_domain *dma_dom, + phys_addr_t paddr, + size_t size, + int dir, + bool align, + u64 dma_mask) +{ + dma_addr_t offset = paddr & ~PAGE_MASK; + dma_addr_t address, start, ret; + unsigned int pages; + unsigned long align_mask = 0; + int i; + + pages = iommu_num_pages(paddr, size, PAGE_SIZE); + paddr &= PAGE_MASK; + + INC_STATS_COUNTER(total_map_requests); + + if (pages > 1) + INC_STATS_COUNTER(cross_page); + + if (align) + align_mask = (1UL << get_order(size)) - 1; + +retry: + address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, + dma_mask); + if (unlikely(address == DMA_ERROR_CODE)) { + /* + * setting next_address here will let the address + * allocator only scan the new allocated range in the + * first run. This is a small optimization. + */ + dma_dom->next_address = dma_dom->aperture_size; + + if (alloc_new_range(dma_dom, false, GFP_ATOMIC)) + goto out; + + /* + * aperture was successfully enlarged by 128 MB, try + * allocation again + */ + goto retry; + } + + start = address; + for (i = 0; i < pages; ++i) { + ret = dma_ops_domain_map(dma_dom, start, paddr, dir); + if (ret == DMA_ERROR_CODE) + goto out_unmap; + + paddr += PAGE_SIZE; + start += PAGE_SIZE; + } + address += offset; + + ADD_STATS_COUNTER(alloced_io_mem, size); + + if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { + domain_flush_tlb(&dma_dom->domain); + dma_dom->need_flush = false; + } else if (unlikely(amd_iommu_np_cache)) + domain_flush_pages(&dma_dom->domain, address, size); + +out: + return address; + +out_unmap: + + for (--i; i >= 0; --i) { + start -= PAGE_SIZE; + dma_ops_domain_unmap(dma_dom, start); + } + + dma_ops_free_addresses(dma_dom, address, pages); + + return DMA_ERROR_CODE; +} + +/* + * Does the reverse of the __map_single function. Must be called with + * the domain lock held too + */ +static void __unmap_single(struct dma_ops_domain *dma_dom, + dma_addr_t dma_addr, + size_t size, + int dir) +{ + dma_addr_t flush_addr; + dma_addr_t i, start; + unsigned int pages; + + if ((dma_addr == DMA_ERROR_CODE) || + (dma_addr + size > dma_dom->aperture_size)) + return; + + flush_addr = dma_addr; + pages = iommu_num_pages(dma_addr, size, PAGE_SIZE); + dma_addr &= PAGE_MASK; + start = dma_addr; + + for (i = 0; i < pages; ++i) { + dma_ops_domain_unmap(dma_dom, start); + start += PAGE_SIZE; + } + + SUB_STATS_COUNTER(alloced_io_mem, size); + + dma_ops_free_addresses(dma_dom, dma_addr, pages); + + if (amd_iommu_unmap_flush || dma_dom->need_flush) { + domain_flush_pages(&dma_dom->domain, flush_addr, size); + dma_dom->need_flush = false; + } +} + +/* + * The exported map_single function for dma_ops. + */ +static dma_addr_t map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + unsigned long flags; + struct protection_domain *domain; + dma_addr_t addr; + u64 dma_mask; + phys_addr_t paddr = page_to_phys(page) + offset; + + INC_STATS_COUNTER(cnt_map_single); + + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) + return (dma_addr_t)paddr; + else if (IS_ERR(domain)) + return DMA_ERROR_CODE; + + dma_mask = *dev->dma_mask; + + spin_lock_irqsave(&domain->lock, flags); + + addr = __map_single(dev, domain->priv, paddr, size, dir, false, + dma_mask); + if (addr == DMA_ERROR_CODE) + goto out; + + domain_flush_complete(domain); + +out: + spin_unlock_irqrestore(&domain->lock, flags); + + return addr; +} + +/* + * The exported unmap_single function for dma_ops. + */ +static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir, struct dma_attrs *attrs) +{ + unsigned long flags; + struct protection_domain *domain; + + INC_STATS_COUNTER(cnt_unmap_single); + + domain = get_domain(dev); + if (IS_ERR(domain)) + return; + + spin_lock_irqsave(&domain->lock, flags); + + __unmap_single(domain->priv, dma_addr, size, dir); + + domain_flush_complete(domain); + + spin_unlock_irqrestore(&domain->lock, flags); +} + +/* + * This is a special map_sg function which is used if we should map a + * device which is not handled by an AMD IOMMU in the system. + */ +static int map_sg_no_iommu(struct device *dev, struct scatterlist *sglist, + int nelems, int dir) +{ + struct scatterlist *s; + int i; + + for_each_sg(sglist, s, nelems, i) { + s->dma_address = (dma_addr_t)sg_phys(s); + s->dma_length = s->length; + } + + return nelems; +} + +/* + * The exported map_sg function for dma_ops (handles scatter-gather + * lists). + */ +static int map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + unsigned long flags; + struct protection_domain *domain; + int i; + struct scatterlist *s; + phys_addr_t paddr; + int mapped_elems = 0; + u64 dma_mask; + + INC_STATS_COUNTER(cnt_map_sg); + + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) + return map_sg_no_iommu(dev, sglist, nelems, dir); + else if (IS_ERR(domain)) + return 0; + + dma_mask = *dev->dma_mask; + + spin_lock_irqsave(&domain->lock, flags); + + for_each_sg(sglist, s, nelems, i) { + paddr = sg_phys(s); + + s->dma_address = __map_single(dev, domain->priv, + paddr, s->length, dir, false, + dma_mask); + + if (s->dma_address) { + s->dma_length = s->length; + mapped_elems++; + } else + goto unmap; + } + + domain_flush_complete(domain); + +out: + spin_unlock_irqrestore(&domain->lock, flags); + + return mapped_elems; +unmap: + for_each_sg(sglist, s, mapped_elems, i) { + if (s->dma_address) + __unmap_single(domain->priv, s->dma_address, + s->dma_length, dir); + s->dma_address = s->dma_length = 0; + } + + mapped_elems = 0; + + goto out; +} + +/* + * The exported map_sg function for dma_ops (handles scatter-gather + * lists). + */ +static void unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + unsigned long flags; + struct protection_domain *domain; + struct scatterlist *s; + int i; + + INC_STATS_COUNTER(cnt_unmap_sg); + + domain = get_domain(dev); + if (IS_ERR(domain)) + return; + + spin_lock_irqsave(&domain->lock, flags); + + for_each_sg(sglist, s, nelems, i) { + __unmap_single(domain->priv, s->dma_address, + s->dma_length, dir); + s->dma_address = s->dma_length = 0; + } + + domain_flush_complete(domain); + + spin_unlock_irqrestore(&domain->lock, flags); +} + +/* + * The exported alloc_coherent function for dma_ops. + */ +static void *alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t flag) +{ + unsigned long flags; + void *virt_addr; + struct protection_domain *domain; + phys_addr_t paddr; + u64 dma_mask = dev->coherent_dma_mask; + + INC_STATS_COUNTER(cnt_alloc_coherent); + + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) { + virt_addr = (void *)__get_free_pages(flag, get_order(size)); + *dma_addr = __pa(virt_addr); + return virt_addr; + } else if (IS_ERR(domain)) + return NULL; + + dma_mask = dev->coherent_dma_mask; + flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); + flag |= __GFP_ZERO; + + virt_addr = (void *)__get_free_pages(flag, get_order(size)); + if (!virt_addr) + return NULL; + + paddr = virt_to_phys(virt_addr); + + if (!dma_mask) + dma_mask = *dev->dma_mask; + + spin_lock_irqsave(&domain->lock, flags); + + *dma_addr = __map_single(dev, domain->priv, paddr, + size, DMA_BIDIRECTIONAL, true, dma_mask); + + if (*dma_addr == DMA_ERROR_CODE) { + spin_unlock_irqrestore(&domain->lock, flags); + goto out_free; + } + + domain_flush_complete(domain); + + spin_unlock_irqrestore(&domain->lock, flags); + + return virt_addr; + +out_free: + + free_pages((unsigned long)virt_addr, get_order(size)); + + return NULL; +} + +/* + * The exported free_coherent function for dma_ops. + */ +static void free_coherent(struct device *dev, size_t size, + void *virt_addr, dma_addr_t dma_addr) +{ + unsigned long flags; + struct protection_domain *domain; + + INC_STATS_COUNTER(cnt_free_coherent); + + domain = get_domain(dev); + if (IS_ERR(domain)) + goto free_mem; + + spin_lock_irqsave(&domain->lock, flags); + + __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); + + domain_flush_complete(domain); + + spin_unlock_irqrestore(&domain->lock, flags); + +free_mem: + free_pages((unsigned long)virt_addr, get_order(size)); +} + +/* + * This function is called by the DMA layer to find out if we can handle a + * particular device. It is part of the dma_ops. + */ +static int amd_iommu_dma_supported(struct device *dev, u64 mask) +{ + return check_device(dev); +} + +/* + * The function for pre-allocating protection domains. + * + * If the driver core informs the DMA layer if a driver grabs a device + * we don't need to preallocate the protection domains anymore. + * For now we have to. + */ +static void prealloc_protection_domains(void) +{ + struct pci_dev *dev = NULL; + struct dma_ops_domain *dma_dom; + u16 devid; + + for_each_pci_dev(dev) { + + /* Do we handle this device? */ + if (!check_device(&dev->dev)) + continue; + + /* Is there already any domain for it? */ + if (domain_for_device(&dev->dev)) + continue; + + devid = get_device_id(&dev->dev); + + dma_dom = dma_ops_domain_alloc(); + if (!dma_dom) + continue; + init_unity_mappings_for_device(dma_dom, devid); + dma_dom->target_dev = devid; + + attach_device(&dev->dev, &dma_dom->domain); + + list_add_tail(&dma_dom->list, &iommu_pd_list); + } +} + +static struct dma_map_ops amd_iommu_dma_ops = { + .alloc_coherent = alloc_coherent, + .free_coherent = free_coherent, + .map_page = map_page, + .unmap_page = unmap_page, + .map_sg = map_sg, + .unmap_sg = unmap_sg, + .dma_supported = amd_iommu_dma_supported, +}; + +static unsigned device_dma_ops_init(void) +{ + struct pci_dev *pdev = NULL; + unsigned unhandled = 0; + + for_each_pci_dev(pdev) { + if (!check_device(&pdev->dev)) { + unhandled += 1; + continue; + } + + pdev->dev.archdata.dma_ops = &amd_iommu_dma_ops; + } + + return unhandled; +} + +/* + * The function which clues the AMD IOMMU driver into dma_ops. + */ + +void __init amd_iommu_init_api(void) +{ + register_iommu(&amd_iommu_ops); +} + +int __init amd_iommu_init_dma_ops(void) +{ + struct amd_iommu *iommu; + int ret, unhandled; + + /* + * first allocate a default protection domain for every IOMMU we + * found in the system. Devices not assigned to any other + * protection domain will be assigned to the default one. + */ + for_each_iommu(iommu) { + iommu->default_dom = dma_ops_domain_alloc(); + if (iommu->default_dom == NULL) + return -ENOMEM; + iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; + ret = iommu_init_unity_mappings(iommu); + if (ret) + goto free_domains; + } + + /* + * Pre-allocate the protection domains for each device. + */ + prealloc_protection_domains(); + + iommu_detected = 1; + swiotlb = 0; + + /* Make the driver finally visible to the drivers */ + unhandled = device_dma_ops_init(); + if (unhandled && max_pfn > MAX_DMA32_PFN) { + /* There are unhandled devices - initialize swiotlb for them */ + swiotlb = 1; + } + + amd_iommu_stats_init(); + + return 0; + +free_domains: + + for_each_iommu(iommu) { + if (iommu->default_dom) + dma_ops_domain_free(iommu->default_dom); + } + + return ret; +} + +/***************************************************************************** + * + * The following functions belong to the exported interface of AMD IOMMU + * + * This interface allows access to lower level functions of the IOMMU + * like protection domain handling and assignement of devices to domains + * which is not possible with the dma_ops interface. + * + *****************************************************************************/ + +static void cleanup_domain(struct protection_domain *domain) +{ + struct iommu_dev_data *dev_data, *next; + unsigned long flags; + + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + + list_for_each_entry_safe(dev_data, next, &domain->dev_list, list) { + __detach_device(dev_data); + atomic_set(&dev_data->bind, 0); + } + + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); +} + +static void protection_domain_free(struct protection_domain *domain) +{ + if (!domain) + return; + + del_domain_from_list(domain); + + if (domain->id) + domain_id_free(domain->id); + + kfree(domain); +} + +static struct protection_domain *protection_domain_alloc(void) +{ + struct protection_domain *domain; + + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) + return NULL; + + spin_lock_init(&domain->lock); + mutex_init(&domain->api_lock); + domain->id = domain_id_alloc(); + if (!domain->id) + goto out_err; + INIT_LIST_HEAD(&domain->dev_list); + + add_domain_to_list(domain); + + return domain; + +out_err: + kfree(domain); + + return NULL; +} + +static int amd_iommu_domain_init(struct iommu_domain *dom) +{ + struct protection_domain *domain; + + domain = protection_domain_alloc(); + if (!domain) + goto out_free; + + domain->mode = PAGE_MODE_3_LEVEL; + domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL); + if (!domain->pt_root) + goto out_free; + + dom->priv = domain; + + return 0; + +out_free: + protection_domain_free(domain); + + return -ENOMEM; +} + +static void amd_iommu_domain_destroy(struct iommu_domain *dom) +{ + struct protection_domain *domain = dom->priv; + + if (!domain) + return; + + if (domain->dev_cnt > 0) + cleanup_domain(domain); + + BUG_ON(domain->dev_cnt != 0); + + free_pagetable(domain); + + protection_domain_free(domain); + + dom->priv = NULL; +} + +static void amd_iommu_detach_device(struct iommu_domain *dom, + struct device *dev) +{ + struct iommu_dev_data *dev_data = dev->archdata.iommu; + struct amd_iommu *iommu; + u16 devid; + + if (!check_device(dev)) + return; + + devid = get_device_id(dev); + + if (dev_data->domain != NULL) + detach_device(dev); + + iommu = amd_iommu_rlookup_table[devid]; + if (!iommu) + return; + + iommu_completion_wait(iommu); +} + +static int amd_iommu_attach_device(struct iommu_domain *dom, + struct device *dev) +{ + struct protection_domain *domain = dom->priv; + struct iommu_dev_data *dev_data; + struct amd_iommu *iommu; + int ret; + + if (!check_device(dev)) + return -EINVAL; + + dev_data = dev->archdata.iommu; + + iommu = amd_iommu_rlookup_table[dev_data->devid]; + if (!iommu) + return -EINVAL; + + if (dev_data->domain) + detach_device(dev); + + ret = attach_device(dev, domain); + + iommu_completion_wait(iommu); + + return ret; +} + +static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova, + phys_addr_t paddr, int gfp_order, int iommu_prot) +{ + unsigned long page_size = 0x1000UL << gfp_order; + struct protection_domain *domain = dom->priv; + int prot = 0; + int ret; + + if (iommu_prot & IOMMU_READ) + prot |= IOMMU_PROT_IR; + if (iommu_prot & IOMMU_WRITE) + prot |= IOMMU_PROT_IW; + + mutex_lock(&domain->api_lock); + ret = iommu_map_page(domain, iova, paddr, prot, page_size); + mutex_unlock(&domain->api_lock); + + return ret; +} + +static int amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova, + int gfp_order) +{ + struct protection_domain *domain = dom->priv; + unsigned long page_size, unmap_size; + + page_size = 0x1000UL << gfp_order; + + mutex_lock(&domain->api_lock); + unmap_size = iommu_unmap_page(domain, iova, page_size); + mutex_unlock(&domain->api_lock); + + domain_flush_tlb_pde(domain); + + return get_order(unmap_size); +} + +static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, + unsigned long iova) +{ + struct protection_domain *domain = dom->priv; + unsigned long offset_mask; + phys_addr_t paddr; + u64 *pte, __pte; + + pte = fetch_pte(domain, iova); + + if (!pte || !IOMMU_PTE_PRESENT(*pte)) + return 0; + + if (PM_PTE_LEVEL(*pte) == 0) + offset_mask = PAGE_SIZE - 1; + else + offset_mask = PTE_PAGE_SIZE(*pte) - 1; + + __pte = *pte & PM_ADDR_MASK; + paddr = (__pte & ~offset_mask) | (iova & offset_mask); + + return paddr; +} + +static int amd_iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + switch (cap) { + case IOMMU_CAP_CACHE_COHERENCY: + return 1; + } + + return 0; +} + +static struct iommu_ops amd_iommu_ops = { + .domain_init = amd_iommu_domain_init, + .domain_destroy = amd_iommu_domain_destroy, + .attach_dev = amd_iommu_attach_device, + .detach_dev = amd_iommu_detach_device, + .map = amd_iommu_map, + .unmap = amd_iommu_unmap, + .iova_to_phys = amd_iommu_iova_to_phys, + .domain_has_cap = amd_iommu_domain_has_cap, +}; + +/***************************************************************************** + * + * The next functions do a basic initialization of IOMMU for pass through + * mode + * + * In passthrough mode the IOMMU is initialized and enabled but not used for + * DMA-API translation. + * + *****************************************************************************/ + +int __init amd_iommu_init_passthrough(void) +{ + struct amd_iommu *iommu; + struct pci_dev *dev = NULL; + u16 devid; + + /* allocate passthrough domain */ + pt_domain = protection_domain_alloc(); + if (!pt_domain) + return -ENOMEM; + + pt_domain->mode |= PAGE_MODE_NONE; + + for_each_pci_dev(dev) { + if (!check_device(&dev->dev)) + continue; + + devid = get_device_id(&dev->dev); + + iommu = amd_iommu_rlookup_table[devid]; + if (!iommu) + continue; + + attach_device(&dev->dev, pt_domain); + } + + pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); + + return 0; +} diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c new file mode 100644 index 00000000000..82d2410f420 --- /dev/null +++ b/drivers/iommu/amd_iommu_init.c @@ -0,0 +1,1574 @@ +/* + * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. + * Author: Joerg Roedel <joerg.roedel@amd.com> + * Leo Duran <leo.duran@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/pci.h> +#include <linux/acpi.h> +#include <linux/list.h> +#include <linux/slab.h> +#include <linux/syscore_ops.h> +#include <linux/interrupt.h> +#include <linux/msi.h> +#include <linux/amd-iommu.h> +#include <asm/pci-direct.h> +#include <asm/iommu.h> +#include <asm/gart.h> +#include <asm/x86_init.h> +#include <asm/iommu_table.h> + +#include "amd_iommu_proto.h" +#include "amd_iommu_types.h" + +/* + * definitions for the ACPI scanning code + */ +#define IVRS_HEADER_LENGTH 48 + +#define ACPI_IVHD_TYPE 0x10 +#define ACPI_IVMD_TYPE_ALL 0x20 +#define ACPI_IVMD_TYPE 0x21 +#define ACPI_IVMD_TYPE_RANGE 0x22 + +#define IVHD_DEV_ALL 0x01 +#define IVHD_DEV_SELECT 0x02 +#define IVHD_DEV_SELECT_RANGE_START 0x03 +#define IVHD_DEV_RANGE_END 0x04 +#define IVHD_DEV_ALIAS 0x42 +#define IVHD_DEV_ALIAS_RANGE 0x43 +#define IVHD_DEV_EXT_SELECT 0x46 +#define IVHD_DEV_EXT_SELECT_RANGE 0x47 + +#define IVHD_FLAG_HT_TUN_EN_MASK 0x01 +#define IVHD_FLAG_PASSPW_EN_MASK 0x02 +#define IVHD_FLAG_RESPASSPW_EN_MASK 0x04 +#define IVHD_FLAG_ISOC_EN_MASK 0x08 + +#define IVMD_FLAG_EXCL_RANGE 0x08 +#define IVMD_FLAG_UNITY_MAP 0x01 + +#define ACPI_DEVFLAG_INITPASS 0x01 +#define ACPI_DEVFLAG_EXTINT 0x02 +#define ACPI_DEVFLAG_NMI 0x04 +#define ACPI_DEVFLAG_SYSMGT1 0x10 +#define ACPI_DEVFLAG_SYSMGT2 0x20 +#define ACPI_DEVFLAG_LINT0 0x40 +#define ACPI_DEVFLAG_LINT1 0x80 +#define ACPI_DEVFLAG_ATSDIS 0x10000000 + +/* + * ACPI table definitions + * + * These data structures are laid over the table to parse the important values + * out of it. + */ + +/* + * structure describing one IOMMU in the ACPI table. Typically followed by one + * or more ivhd_entrys. + */ +struct ivhd_header { + u8 type; + u8 flags; + u16 length; + u16 devid; + u16 cap_ptr; + u64 mmio_phys; + u16 pci_seg; + u16 info; + u32 reserved; +} __attribute__((packed)); + +/* + * A device entry describing which devices a specific IOMMU translates and + * which requestor ids they use. + */ +struct ivhd_entry { + u8 type; + u16 devid; + u8 flags; + u32 ext; +} __attribute__((packed)); + +/* + * An AMD IOMMU memory definition structure. It defines things like exclusion + * ranges for devices and regions that should be unity mapped. + */ +struct ivmd_header { + u8 type; + u8 flags; + u16 length; + u16 devid; + u16 aux; + u64 resv; + u64 range_start; + u64 range_length; +} __attribute__((packed)); + +bool amd_iommu_dump; + +static int __initdata amd_iommu_detected; +static bool __initdata amd_iommu_disabled; + +u16 amd_iommu_last_bdf; /* largest PCI device id we have + to handle */ +LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings + we find in ACPI */ +bool amd_iommu_unmap_flush; /* if true, flush on every unmap */ + +LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the + system */ + +/* Array to assign indices to IOMMUs*/ +struct amd_iommu *amd_iommus[MAX_IOMMUS]; +int amd_iommus_present; + +/* IOMMUs have a non-present cache? */ +bool amd_iommu_np_cache __read_mostly; +bool amd_iommu_iotlb_sup __read_mostly = true; + +/* + * The ACPI table parsing functions set this variable on an error + */ +static int __initdata amd_iommu_init_err; + +/* + * List of protection domains - used during resume + */ +LIST_HEAD(amd_iommu_pd_list); +spinlock_t amd_iommu_pd_lock; + +/* + * Pointer to the device table which is shared by all AMD IOMMUs + * it is indexed by the PCI device id or the HT unit id and contains + * information about the domain the device belongs to as well as the + * page table root pointer. + */ +struct dev_table_entry *amd_iommu_dev_table; + +/* + * The alias table is a driver specific data structure which contains the + * mappings of the PCI device ids to the actual requestor ids on the IOMMU. + * More than one device can share the same requestor id. + */ +u16 *amd_iommu_alias_table; + +/* + * The rlookup table is used to find the IOMMU which is responsible + * for a specific device. It is also indexed by the PCI device id. + */ +struct amd_iommu **amd_iommu_rlookup_table; + +/* + * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap + * to know which ones are already in use. + */ +unsigned long *amd_iommu_pd_alloc_bitmap; + +static u32 dev_table_size; /* size of the device table */ +static u32 alias_table_size; /* size of the alias table */ +static u32 rlookup_table_size; /* size if the rlookup table */ + +/* + * This function flushes all internal caches of + * the IOMMU used by this driver. + */ +extern void iommu_flush_all_caches(struct amd_iommu *iommu); + +static inline void update_last_devid(u16 devid) +{ + if (devid > amd_iommu_last_bdf) + amd_iommu_last_bdf = devid; +} + +static inline unsigned long tbl_size(int entry_size) +{ + unsigned shift = PAGE_SHIFT + + get_order(((int)amd_iommu_last_bdf + 1) * entry_size); + + return 1UL << shift; +} + +/* Access to l1 and l2 indexed register spaces */ + +static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address) +{ + u32 val; + + pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16)); + pci_read_config_dword(iommu->dev, 0xfc, &val); + return val; +} + +static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val) +{ + pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31)); + pci_write_config_dword(iommu->dev, 0xfc, val); + pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16)); +} + +static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address) +{ + u32 val; + + pci_write_config_dword(iommu->dev, 0xf0, address); + pci_read_config_dword(iommu->dev, 0xf4, &val); + return val; +} + +static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val) +{ + pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8)); + pci_write_config_dword(iommu->dev, 0xf4, val); +} + +/**************************************************************************** + * + * AMD IOMMU MMIO register space handling functions + * + * These functions are used to program the IOMMU device registers in + * MMIO space required for that driver. + * + ****************************************************************************/ + +/* + * This function set the exclusion range in the IOMMU. DMA accesses to the + * exclusion range are passed through untranslated + */ +static void iommu_set_exclusion_range(struct amd_iommu *iommu) +{ + u64 start = iommu->exclusion_start & PAGE_MASK; + u64 limit = (start + iommu->exclusion_length) & PAGE_MASK; + u64 entry; + + if (!iommu->exclusion_start) + return; + + entry = start | MMIO_EXCL_ENABLE_MASK; + memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET, + &entry, sizeof(entry)); + + entry = limit; + memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET, + &entry, sizeof(entry)); +} + +/* Programs the physical address of the device table into the IOMMU hardware */ +static void __init iommu_set_device_table(struct amd_iommu *iommu) +{ + u64 entry; + + BUG_ON(iommu->mmio_base == NULL); + + entry = virt_to_phys(amd_iommu_dev_table); + entry |= (dev_table_size >> 12) - 1; + memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET, + &entry, sizeof(entry)); +} + +/* Generic functions to enable/disable certain features of the IOMMU. */ +static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit) +{ + u32 ctrl; + + ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); + ctrl |= (1 << bit); + writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); +} + +static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit) +{ + u32 ctrl; + + ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET); + ctrl &= ~(1 << bit); + writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET); +} + +/* Function to enable the hardware */ +static void iommu_enable(struct amd_iommu *iommu) +{ + static const char * const feat_str[] = { + "PreF", "PPR", "X2APIC", "NX", "GT", "[5]", + "IA", "GA", "HE", "PC", NULL + }; + int i; + + printk(KERN_INFO "AMD-Vi: Enabling IOMMU at %s cap 0x%hx", + dev_name(&iommu->dev->dev), iommu->cap_ptr); + + if (iommu->cap & (1 << IOMMU_CAP_EFR)) { + printk(KERN_CONT " extended features: "); + for (i = 0; feat_str[i]; ++i) + if (iommu_feature(iommu, (1ULL << i))) + printk(KERN_CONT " %s", feat_str[i]); + } + printk(KERN_CONT "\n"); + + iommu_feature_enable(iommu, CONTROL_IOMMU_EN); +} + +static void iommu_disable(struct amd_iommu *iommu) +{ + /* Disable command buffer */ + iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); + + /* Disable event logging and event interrupts */ + iommu_feature_disable(iommu, CONTROL_EVT_INT_EN); + iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN); + + /* Disable IOMMU hardware itself */ + iommu_feature_disable(iommu, CONTROL_IOMMU_EN); +} + +/* + * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in + * the system has one. + */ +static u8 * __init iommu_map_mmio_space(u64 address) +{ + u8 *ret; + + if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) { + pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n", + address); + pr_err("AMD-Vi: This is a BIOS bug. Please contact your hardware vendor\n"); + return NULL; + } + + ret = ioremap_nocache(address, MMIO_REGION_LENGTH); + if (ret != NULL) + return ret; + + release_mem_region(address, MMIO_REGION_LENGTH); + + return NULL; +} + +static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu) +{ + if (iommu->mmio_base) + iounmap(iommu->mmio_base); + release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH); +} + +/**************************************************************************** + * + * The functions below belong to the first pass of AMD IOMMU ACPI table + * parsing. In this pass we try to find out the highest device id this + * code has to handle. Upon this information the size of the shared data + * structures is determined later. + * + ****************************************************************************/ + +/* + * This function calculates the length of a given IVHD entry + */ +static inline int ivhd_entry_length(u8 *ivhd) +{ + return 0x04 << (*ivhd >> 6); +} + +/* + * This function reads the last device id the IOMMU has to handle from the PCI + * capability header for this IOMMU + */ +static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr) +{ + u32 cap; + + cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET); + update_last_devid(calc_devid(MMIO_GET_BUS(cap), MMIO_GET_LD(cap))); + + return 0; +} + +/* + * After reading the highest device id from the IOMMU PCI capability header + * this function looks if there is a higher device id defined in the ACPI table + */ +static int __init find_last_devid_from_ivhd(struct ivhd_header *h) +{ + u8 *p = (void *)h, *end = (void *)h; + struct ivhd_entry *dev; + + p += sizeof(*h); + end += h->length; + + find_last_devid_on_pci(PCI_BUS(h->devid), + PCI_SLOT(h->devid), + PCI_FUNC(h->devid), + h->cap_ptr); + + while (p < end) { + dev = (struct ivhd_entry *)p; + switch (dev->type) { + case IVHD_DEV_SELECT: + case IVHD_DEV_RANGE_END: + case IVHD_DEV_ALIAS: + case IVHD_DEV_EXT_SELECT: + /* all the above subfield types refer to device ids */ + update_last_devid(dev->devid); + break; + default: + break; + } + p += ivhd_entry_length(p); + } + + WARN_ON(p != end); + + return 0; +} + +/* + * Iterate over all IVHD entries in the ACPI table and find the highest device + * id which we need to handle. This is the first of three functions which parse + * the ACPI table. So we check the checksum here. + */ +static int __init find_last_devid_acpi(struct acpi_table_header *table) +{ + int i; + u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table; + struct ivhd_header *h; + + /* + * Validate checksum here so we don't need to do it when + * we actually parse the table + */ + for (i = 0; i < table->length; ++i) + checksum += p[i]; + if (checksum != 0) { + /* ACPI table corrupt */ + amd_iommu_init_err = -ENODEV; + return 0; + } + + p += IVRS_HEADER_LENGTH; + + end += table->length; + while (p < end) { + h = (struct ivhd_header *)p; + switch (h->type) { + case ACPI_IVHD_TYPE: + find_last_devid_from_ivhd(h); + break; + default: + break; + } + p += h->length; + } + WARN_ON(p != end); + + return 0; +} + +/**************************************************************************** + * + * The following functions belong the the code path which parses the ACPI table + * the second time. In this ACPI parsing iteration we allocate IOMMU specific + * data structures, initialize the device/alias/rlookup table and also + * basically initialize the hardware. + * + ****************************************************************************/ + +/* + * Allocates the command buffer. This buffer is per AMD IOMMU. We can + * write commands to that buffer later and the IOMMU will execute them + * asynchronously + */ +static u8 * __init alloc_command_buffer(struct amd_iommu *iommu) +{ + u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(CMD_BUFFER_SIZE)); + + if (cmd_buf == NULL) + return NULL; + + iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED; + + return cmd_buf; +} + +/* + * This function resets the command buffer if the IOMMU stopped fetching + * commands from it. + */ +void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu) +{ + iommu_feature_disable(iommu, CONTROL_CMDBUF_EN); + + writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET); + writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET); + + iommu_feature_enable(iommu, CONTROL_CMDBUF_EN); +} + +/* + * This function writes the command buffer address to the hardware and + * enables it. + */ +static void iommu_enable_command_buffer(struct amd_iommu *iommu) +{ + u64 entry; + + BUG_ON(iommu->cmd_buf == NULL); + + entry = (u64)virt_to_phys(iommu->cmd_buf); + entry |= MMIO_CMD_SIZE_512; + + memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, + &entry, sizeof(entry)); + + amd_iommu_reset_cmd_buffer(iommu); + iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED); +} + +static void __init free_command_buffer(struct amd_iommu *iommu) +{ + free_pages((unsigned long)iommu->cmd_buf, + get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED))); +} + +/* allocates the memory where the IOMMU will log its events to */ +static u8 * __init alloc_event_buffer(struct amd_iommu *iommu) +{ + iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(EVT_BUFFER_SIZE)); + + if (iommu->evt_buf == NULL) + return NULL; + + iommu->evt_buf_size = EVT_BUFFER_SIZE; + + return iommu->evt_buf; +} + +static void iommu_enable_event_buffer(struct amd_iommu *iommu) +{ + u64 entry; + + BUG_ON(iommu->evt_buf == NULL); + + entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK; + + memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET, + &entry, sizeof(entry)); + + /* set head and tail to zero manually */ + writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET); + writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET); + + iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN); +} + +static void __init free_event_buffer(struct amd_iommu *iommu) +{ + free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE)); +} + +/* sets a specific bit in the device table entry. */ +static void set_dev_entry_bit(u16 devid, u8 bit) +{ + int i = (bit >> 5) & 0x07; + int _bit = bit & 0x1f; + + amd_iommu_dev_table[devid].data[i] |= (1 << _bit); +} + +static int get_dev_entry_bit(u16 devid, u8 bit) +{ + int i = (bit >> 5) & 0x07; + int _bit = bit & 0x1f; + + return (amd_iommu_dev_table[devid].data[i] & (1 << _bit)) >> _bit; +} + + +void amd_iommu_apply_erratum_63(u16 devid) +{ + int sysmgt; + + sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) | + (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1); + + if (sysmgt == 0x01) + set_dev_entry_bit(devid, DEV_ENTRY_IW); +} + +/* Writes the specific IOMMU for a device into the rlookup table */ +static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid) +{ + amd_iommu_rlookup_table[devid] = iommu; +} + +/* + * This function takes the device specific flags read from the ACPI + * table and sets up the device table entry with that information + */ +static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu, + u16 devid, u32 flags, u32 ext_flags) +{ + if (flags & ACPI_DEVFLAG_INITPASS) + set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS); + if (flags & ACPI_DEVFLAG_EXTINT) + set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS); + if (flags & ACPI_DEVFLAG_NMI) + set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS); + if (flags & ACPI_DEVFLAG_SYSMGT1) + set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1); + if (flags & ACPI_DEVFLAG_SYSMGT2) + set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2); + if (flags & ACPI_DEVFLAG_LINT0) + set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS); + if (flags & ACPI_DEVFLAG_LINT1) + set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS); + + amd_iommu_apply_erratum_63(devid); + + set_iommu_for_device(iommu, devid); +} + +/* + * Reads the device exclusion range from ACPI and initialize IOMMU with + * it + */ +static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m) +{ + struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; + + if (!(m->flags & IVMD_FLAG_EXCL_RANGE)) + return; + + if (iommu) { + /* + * We only can configure exclusion ranges per IOMMU, not + * per device. But we can enable the exclusion range per + * device. This is done here + */ + set_dev_entry_bit(m->devid, DEV_ENTRY_EX); + iommu->exclusion_start = m->range_start; + iommu->exclusion_length = m->range_length; + } +} + +/* + * This function reads some important data from the IOMMU PCI space and + * initializes the driver data structure with it. It reads the hardware + * capabilities and the first/last device entries + */ +static void __init init_iommu_from_pci(struct amd_iommu *iommu) +{ + int cap_ptr = iommu->cap_ptr; + u32 range, misc, low, high; + int i, j; + + pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET, + &iommu->cap); + pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET, + &range); + pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET, + &misc); + + iommu->first_device = calc_devid(MMIO_GET_BUS(range), + MMIO_GET_FD(range)); + iommu->last_device = calc_devid(MMIO_GET_BUS(range), + MMIO_GET_LD(range)); + iommu->evt_msi_num = MMIO_MSI_NUM(misc); + + if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB))) + amd_iommu_iotlb_sup = false; + + /* read extended feature bits */ + low = readl(iommu->mmio_base + MMIO_EXT_FEATURES); + high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4); + + iommu->features = ((u64)high << 32) | low; + + if (!is_rd890_iommu(iommu->dev)) + return; + + /* + * Some rd890 systems may not be fully reconfigured by the BIOS, so + * it's necessary for us to store this information so it can be + * reprogrammed on resume + */ + + pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4, + &iommu->stored_addr_lo); + pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8, + &iommu->stored_addr_hi); + + /* Low bit locks writes to configuration space */ + iommu->stored_addr_lo &= ~1; + + for (i = 0; i < 6; i++) + for (j = 0; j < 0x12; j++) + iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j); + + for (i = 0; i < 0x83; i++) + iommu->stored_l2[i] = iommu_read_l2(iommu, i); +} + +/* + * Takes a pointer to an AMD IOMMU entry in the ACPI table and + * initializes the hardware and our data structures with it. + */ +static void __init init_iommu_from_acpi(struct amd_iommu *iommu, + struct ivhd_header *h) +{ + u8 *p = (u8 *)h; + u8 *end = p, flags = 0; + u16 devid = 0, devid_start = 0, devid_to = 0; + u32 dev_i, ext_flags = 0; + bool alias = false; + struct ivhd_entry *e; + + /* + * First save the recommended feature enable bits from ACPI + */ + iommu->acpi_flags = h->flags; + + /* + * Done. Now parse the device entries + */ + p += sizeof(struct ivhd_header); + end += h->length; + + + while (p < end) { + e = (struct ivhd_entry *)p; + switch (e->type) { + case IVHD_DEV_ALL: + + DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x" + " last device %02x:%02x.%x flags: %02x\n", + PCI_BUS(iommu->first_device), + PCI_SLOT(iommu->first_device), + PCI_FUNC(iommu->first_device), + PCI_BUS(iommu->last_device), + PCI_SLOT(iommu->last_device), + PCI_FUNC(iommu->last_device), + e->flags); + + for (dev_i = iommu->first_device; + dev_i <= iommu->last_device; ++dev_i) + set_dev_entry_from_acpi(iommu, dev_i, + e->flags, 0); + break; + case IVHD_DEV_SELECT: + + DUMP_printk(" DEV_SELECT\t\t\t devid: %02x:%02x.%x " + "flags: %02x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags); + + devid = e->devid; + set_dev_entry_from_acpi(iommu, devid, e->flags, 0); + break; + case IVHD_DEV_SELECT_RANGE_START: + + DUMP_printk(" DEV_SELECT_RANGE_START\t " + "devid: %02x:%02x.%x flags: %02x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags); + + devid_start = e->devid; + flags = e->flags; + ext_flags = 0; + alias = false; + break; + case IVHD_DEV_ALIAS: + + DUMP_printk(" DEV_ALIAS\t\t\t devid: %02x:%02x.%x " + "flags: %02x devid_to: %02x:%02x.%x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags, + PCI_BUS(e->ext >> 8), + PCI_SLOT(e->ext >> 8), + PCI_FUNC(e->ext >> 8)); + + devid = e->devid; + devid_to = e->ext >> 8; + set_dev_entry_from_acpi(iommu, devid , e->flags, 0); + set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0); + amd_iommu_alias_table[devid] = devid_to; + break; + case IVHD_DEV_ALIAS_RANGE: + + DUMP_printk(" DEV_ALIAS_RANGE\t\t " + "devid: %02x:%02x.%x flags: %02x " + "devid_to: %02x:%02x.%x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags, + PCI_BUS(e->ext >> 8), + PCI_SLOT(e->ext >> 8), + PCI_FUNC(e->ext >> 8)); + + devid_start = e->devid; + flags = e->flags; + devid_to = e->ext >> 8; + ext_flags = 0; + alias = true; + break; + case IVHD_DEV_EXT_SELECT: + + DUMP_printk(" DEV_EXT_SELECT\t\t devid: %02x:%02x.%x " + "flags: %02x ext: %08x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags, e->ext); + + devid = e->devid; + set_dev_entry_from_acpi(iommu, devid, e->flags, + e->ext); + break; + case IVHD_DEV_EXT_SELECT_RANGE: + + DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: " + "%02x:%02x.%x flags: %02x ext: %08x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid), + e->flags, e->ext); + + devid_start = e->devid; + flags = e->flags; + ext_flags = e->ext; + alias = false; + break; + case IVHD_DEV_RANGE_END: + + DUMP_printk(" DEV_RANGE_END\t\t devid: %02x:%02x.%x\n", + PCI_BUS(e->devid), + PCI_SLOT(e->devid), + PCI_FUNC(e->devid)); + + devid = e->devid; + for (dev_i = devid_start; dev_i <= devid; ++dev_i) { + if (alias) { + amd_iommu_alias_table[dev_i] = devid_to; + set_dev_entry_from_acpi(iommu, + devid_to, flags, ext_flags); + } + set_dev_entry_from_acpi(iommu, dev_i, + flags, ext_flags); + } + break; + default: + break; + } + + p += ivhd_entry_length(p); + } +} + +/* Initializes the device->iommu mapping for the driver */ +static int __init init_iommu_devices(struct amd_iommu *iommu) +{ + u32 i; + + for (i = iommu->first_device; i <= iommu->last_device; ++i) + set_iommu_for_device(iommu, i); + + return 0; +} + +static void __init free_iommu_one(struct amd_iommu *iommu) +{ + free_command_buffer(iommu); + free_event_buffer(iommu); + iommu_unmap_mmio_space(iommu); +} + +static void __init free_iommu_all(void) +{ + struct amd_iommu *iommu, *next; + + for_each_iommu_safe(iommu, next) { + list_del(&iommu->list); + free_iommu_one(iommu); + kfree(iommu); + } +} + +/* + * This function clues the initialization function for one IOMMU + * together and also allocates the command buffer and programs the + * hardware. It does NOT enable the IOMMU. This is done afterwards. + */ +static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h) +{ + spin_lock_init(&iommu->lock); + + /* Add IOMMU to internal data structures */ + list_add_tail(&iommu->list, &amd_iommu_list); + iommu->index = amd_iommus_present++; + + if (unlikely(iommu->index >= MAX_IOMMUS)) { + WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n"); + return -ENOSYS; + } + + /* Index is fine - add IOMMU to the array */ + amd_iommus[iommu->index] = iommu; + + /* + * Copy data from ACPI table entry to the iommu struct + */ + iommu->dev = pci_get_bus_and_slot(PCI_BUS(h->devid), h->devid & 0xff); + if (!iommu->dev) + return 1; + + iommu->cap_ptr = h->cap_ptr; + iommu->pci_seg = h->pci_seg; + iommu->mmio_phys = h->mmio_phys; + iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys); + if (!iommu->mmio_base) + return -ENOMEM; + + iommu->cmd_buf = alloc_command_buffer(iommu); + if (!iommu->cmd_buf) + return -ENOMEM; + + iommu->evt_buf = alloc_event_buffer(iommu); + if (!iommu->evt_buf) + return -ENOMEM; + + iommu->int_enabled = false; + + init_iommu_from_pci(iommu); + init_iommu_from_acpi(iommu, h); + init_iommu_devices(iommu); + + if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) + amd_iommu_np_cache = true; + + return pci_enable_device(iommu->dev); +} + +/* + * Iterates over all IOMMU entries in the ACPI table, allocates the + * IOMMU structure and initializes it with init_iommu_one() + */ +static int __init init_iommu_all(struct acpi_table_header *table) +{ + u8 *p = (u8 *)table, *end = (u8 *)table; + struct ivhd_header *h; + struct amd_iommu *iommu; + int ret; + + end += table->length; + p += IVRS_HEADER_LENGTH; + + while (p < end) { + h = (struct ivhd_header *)p; + switch (*p) { + case ACPI_IVHD_TYPE: + + DUMP_printk("device: %02x:%02x.%01x cap: %04x " + "seg: %d flags: %01x info %04x\n", + PCI_BUS(h->devid), PCI_SLOT(h->devid), + PCI_FUNC(h->devid), h->cap_ptr, + h->pci_seg, h->flags, h->info); + DUMP_printk(" mmio-addr: %016llx\n", + h->mmio_phys); + + iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL); + if (iommu == NULL) { + amd_iommu_init_err = -ENOMEM; + return 0; + } + + ret = init_iommu_one(iommu, h); + if (ret) { + amd_iommu_init_err = ret; + return 0; + } + break; + default: + break; + } + p += h->length; + + } + WARN_ON(p != end); + + return 0; +} + +/**************************************************************************** + * + * The following functions initialize the MSI interrupts for all IOMMUs + * in the system. Its a bit challenging because there could be multiple + * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per + * pci_dev. + * + ****************************************************************************/ + +static int iommu_setup_msi(struct amd_iommu *iommu) +{ + int r; + + if (pci_enable_msi(iommu->dev)) + return 1; + + r = request_threaded_irq(iommu->dev->irq, + amd_iommu_int_handler, + amd_iommu_int_thread, + 0, "AMD-Vi", + iommu->dev); + + if (r) { + pci_disable_msi(iommu->dev); + return 1; + } + + iommu->int_enabled = true; + iommu_feature_enable(iommu, CONTROL_EVT_INT_EN); + + return 0; +} + +static int iommu_init_msi(struct amd_iommu *iommu) +{ + if (iommu->int_enabled) + return 0; + + if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI)) + return iommu_setup_msi(iommu); + + return 1; +} + +/**************************************************************************** + * + * The next functions belong to the third pass of parsing the ACPI + * table. In this last pass the memory mapping requirements are + * gathered (like exclusion and unity mapping reanges). + * + ****************************************************************************/ + +static void __init free_unity_maps(void) +{ + struct unity_map_entry *entry, *next; + + list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) { + list_del(&entry->list); + kfree(entry); + } +} + +/* called when we find an exclusion range definition in ACPI */ +static int __init init_exclusion_range(struct ivmd_header *m) +{ + int i; + + switch (m->type) { + case ACPI_IVMD_TYPE: + set_device_exclusion_range(m->devid, m); + break; + case ACPI_IVMD_TYPE_ALL: + for (i = 0; i <= amd_iommu_last_bdf; ++i) + set_device_exclusion_range(i, m); + break; + case ACPI_IVMD_TYPE_RANGE: + for (i = m->devid; i <= m->aux; ++i) + set_device_exclusion_range(i, m); + break; + default: + break; + } + + return 0; +} + +/* called for unity map ACPI definition */ +static int __init init_unity_map_range(struct ivmd_header *m) +{ + struct unity_map_entry *e = 0; + char *s; + + e = kzalloc(sizeof(*e), GFP_KERNEL); + if (e == NULL) + return -ENOMEM; + + switch (m->type) { + default: + kfree(e); + return 0; + case ACPI_IVMD_TYPE: + s = "IVMD_TYPEi\t\t\t"; + e->devid_start = e->devid_end = m->devid; + break; + case ACPI_IVMD_TYPE_ALL: + s = "IVMD_TYPE_ALL\t\t"; + e->devid_start = 0; + e->devid_end = amd_iommu_last_bdf; + break; + case ACPI_IVMD_TYPE_RANGE: + s = "IVMD_TYPE_RANGE\t\t"; + e->devid_start = m->devid; + e->devid_end = m->aux; + break; + } + e->address_start = PAGE_ALIGN(m->range_start); + e->address_end = e->address_start + PAGE_ALIGN(m->range_length); + e->prot = m->flags >> 1; + + DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x" + " range_start: %016llx range_end: %016llx flags: %x\n", s, + PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start), + PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end), + PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end), + e->address_start, e->address_end, m->flags); + + list_add_tail(&e->list, &amd_iommu_unity_map); + + return 0; +} + +/* iterates over all memory definitions we find in the ACPI table */ +static int __init init_memory_definitions(struct acpi_table_header *table) +{ + u8 *p = (u8 *)table, *end = (u8 *)table; + struct ivmd_header *m; + + end += table->length; + p += IVRS_HEADER_LENGTH; + + while (p < end) { + m = (struct ivmd_header *)p; + if (m->flags & IVMD_FLAG_EXCL_RANGE) + init_exclusion_range(m); + else if (m->flags & IVMD_FLAG_UNITY_MAP) + init_unity_map_range(m); + + p += m->length; + } + + return 0; +} + +/* + * Init the device table to not allow DMA access for devices and + * suppress all page faults + */ +static void init_device_table(void) +{ + u32 devid; + + for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) { + set_dev_entry_bit(devid, DEV_ENTRY_VALID); + set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION); + } +} + +static void iommu_init_flags(struct amd_iommu *iommu) +{ + iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ? + iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) : + iommu_feature_disable(iommu, CONTROL_HT_TUN_EN); + + iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ? + iommu_feature_enable(iommu, CONTROL_PASSPW_EN) : + iommu_feature_disable(iommu, CONTROL_PASSPW_EN); + + iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ? + iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) : + iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN); + + iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ? + iommu_feature_enable(iommu, CONTROL_ISOC_EN) : + iommu_feature_disable(iommu, CONTROL_ISOC_EN); + + /* + * make IOMMU memory accesses cache coherent + */ + iommu_feature_enable(iommu, CONTROL_COHERENT_EN); +} + +static void iommu_apply_resume_quirks(struct amd_iommu *iommu) +{ + int i, j; + u32 ioc_feature_control; + struct pci_dev *pdev = NULL; + + /* RD890 BIOSes may not have completely reconfigured the iommu */ + if (!is_rd890_iommu(iommu->dev)) + return; + + /* + * First, we need to ensure that the iommu is enabled. This is + * controlled by a register in the northbridge + */ + pdev = pci_get_bus_and_slot(iommu->dev->bus->number, PCI_DEVFN(0, 0)); + + if (!pdev) + return; + + /* Select Northbridge indirect register 0x75 and enable writing */ + pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7)); + pci_read_config_dword(pdev, 0x64, &ioc_feature_control); + + /* Enable the iommu */ + if (!(ioc_feature_control & 0x1)) + pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1); + + pci_dev_put(pdev); + + /* Restore the iommu BAR */ + pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4, + iommu->stored_addr_lo); + pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8, + iommu->stored_addr_hi); + + /* Restore the l1 indirect regs for each of the 6 l1s */ + for (i = 0; i < 6; i++) + for (j = 0; j < 0x12; j++) + iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]); + + /* Restore the l2 indirect regs */ + for (i = 0; i < 0x83; i++) + iommu_write_l2(iommu, i, iommu->stored_l2[i]); + + /* Lock PCI setup registers */ + pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4, + iommu->stored_addr_lo | 1); +} + +/* + * This function finally enables all IOMMUs found in the system after + * they have been initialized + */ +static void enable_iommus(void) +{ + struct amd_iommu *iommu; + + for_each_iommu(iommu) { + iommu_disable(iommu); + iommu_init_flags(iommu); + iommu_set_device_table(iommu); + iommu_enable_command_buffer(iommu); + iommu_enable_event_buffer(iommu); + iommu_set_exclusion_range(iommu); + iommu_init_msi(iommu); + iommu_enable(iommu); + iommu_flush_all_caches(iommu); + } +} + +static void disable_iommus(void) +{ + struct amd_iommu *iommu; + + for_each_iommu(iommu) + iommu_disable(iommu); +} + +/* + * Suspend/Resume support + * disable suspend until real resume implemented + */ + +static void amd_iommu_resume(void) +{ + struct amd_iommu *iommu; + + for_each_iommu(iommu) + iommu_apply_resume_quirks(iommu); + + /* re-load the hardware */ + enable_iommus(); + + /* + * we have to flush after the IOMMUs are enabled because a + * disabled IOMMU will never execute the commands we send + */ + for_each_iommu(iommu) + iommu_flush_all_caches(iommu); +} + +static int amd_iommu_suspend(void) +{ + /* disable IOMMUs to go out of the way for BIOS */ + disable_iommus(); + + return 0; +} + +static struct syscore_ops amd_iommu_syscore_ops = { + .suspend = amd_iommu_suspend, + .resume = amd_iommu_resume, +}; + +/* + * This is the core init function for AMD IOMMU hardware in the system. + * This function is called from the generic x86 DMA layer initialization + * code. + * + * This function basically parses the ACPI table for AMD IOMMU (IVRS) + * three times: + * + * 1 pass) Find the highest PCI device id the driver has to handle. + * Upon this information the size of the data structures is + * determined that needs to be allocated. + * + * 2 pass) Initialize the data structures just allocated with the + * information in the ACPI table about available AMD IOMMUs + * in the system. It also maps the PCI devices in the + * system to specific IOMMUs + * + * 3 pass) After the basic data structures are allocated and + * initialized we update them with information about memory + * remapping requirements parsed out of the ACPI table in + * this last pass. + * + * After that the hardware is initialized and ready to go. In the last + * step we do some Linux specific things like registering the driver in + * the dma_ops interface and initializing the suspend/resume support + * functions. Finally it prints some information about AMD IOMMUs and + * the driver state and enables the hardware. + */ +static int __init amd_iommu_init(void) +{ + int i, ret = 0; + + /* + * First parse ACPI tables to find the largest Bus/Dev/Func + * we need to handle. Upon this information the shared data + * structures for the IOMMUs in the system will be allocated + */ + if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0) + return -ENODEV; + + ret = amd_iommu_init_err; + if (ret) + goto out; + + dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE); + alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE); + rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE); + + ret = -ENOMEM; + + /* Device table - directly used by all IOMMUs */ + amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(dev_table_size)); + if (amd_iommu_dev_table == NULL) + goto out; + + /* + * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the + * IOMMU see for that device + */ + amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL, + get_order(alias_table_size)); + if (amd_iommu_alias_table == NULL) + goto free; + + /* IOMMU rlookup table - find the IOMMU for a specific device */ + amd_iommu_rlookup_table = (void *)__get_free_pages( + GFP_KERNEL | __GFP_ZERO, + get_order(rlookup_table_size)); + if (amd_iommu_rlookup_table == NULL) + goto free; + + amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages( + GFP_KERNEL | __GFP_ZERO, + get_order(MAX_DOMAIN_ID/8)); + if (amd_iommu_pd_alloc_bitmap == NULL) + goto free; + + /* init the device table */ + init_device_table(); + + /* + * let all alias entries point to itself + */ + for (i = 0; i <= amd_iommu_last_bdf; ++i) + amd_iommu_alias_table[i] = i; + + /* + * never allocate domain 0 because its used as the non-allocated and + * error value placeholder + */ + amd_iommu_pd_alloc_bitmap[0] = 1; + + spin_lock_init(&amd_iommu_pd_lock); + + /* + * now the data structures are allocated and basically initialized + * start the real acpi table scan + */ + ret = -ENODEV; + if (acpi_table_parse("IVRS", init_iommu_all) != 0) + goto free; + + if (amd_iommu_init_err) { + ret = amd_iommu_init_err; + goto free; + } + + if (acpi_table_parse("IVRS", init_memory_definitions) != 0) + goto free; + + if (amd_iommu_init_err) { + ret = amd_iommu_init_err; + goto free; + } + + ret = amd_iommu_init_devices(); + if (ret) + goto free; + + enable_iommus(); + + if (iommu_pass_through) + ret = amd_iommu_init_passthrough(); + else + ret = amd_iommu_init_dma_ops(); + + if (ret) + goto free_disable; + + amd_iommu_init_api(); + + amd_iommu_init_notifier(); + + register_syscore_ops(&amd_iommu_syscore_ops); + + if (iommu_pass_through) + goto out; + + if (amd_iommu_unmap_flush) + printk(KERN_INFO "AMD-Vi: IO/TLB flush on unmap enabled\n"); + else + printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n"); + + x86_platform.iommu_shutdown = disable_iommus; +out: + return ret; + +free_disable: + disable_iommus(); + +free: + amd_iommu_uninit_devices(); + + free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, + get_order(MAX_DOMAIN_ID/8)); + + free_pages((unsigned long)amd_iommu_rlookup_table, + get_order(rlookup_table_size)); + + free_pages((unsigned long)amd_iommu_alias_table, + get_order(alias_table_size)); + + free_pages((unsigned long)amd_iommu_dev_table, + get_order(dev_table_size)); + + free_iommu_all(); + + free_unity_maps(); + +#ifdef CONFIG_GART_IOMMU + /* + * We failed to initialize the AMD IOMMU - try fallback to GART + * if possible. + */ + gart_iommu_init(); + +#endif + + goto out; +} + +/**************************************************************************** + * + * Early detect code. This code runs at IOMMU detection time in the DMA + * layer. It just looks if there is an IVRS ACPI table to detect AMD + * IOMMUs + * + ****************************************************************************/ +static int __init early_amd_iommu_detect(struct acpi_table_header *table) +{ + return 0; +} + +int __init amd_iommu_detect(void) +{ + if (no_iommu || (iommu_detected && !gart_iommu_aperture)) + return -ENODEV; + + if (amd_iommu_disabled) + return -ENODEV; + + if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) { + iommu_detected = 1; + amd_iommu_detected = 1; + x86_init.iommu.iommu_init = amd_iommu_init; + + /* Make sure ACS will be enabled */ + pci_request_acs(); + return 1; + } + return -ENODEV; +} + +/**************************************************************************** + * + * Parsing functions for the AMD IOMMU specific kernel command line + * options. + * + ****************************************************************************/ + +static int __init parse_amd_iommu_dump(char *str) +{ + amd_iommu_dump = true; + + return 1; +} + +static int __init parse_amd_iommu_options(char *str) +{ + for (; *str; ++str) { + if (strncmp(str, "fullflush", 9) == 0) + amd_iommu_unmap_flush = true; + if (strncmp(str, "off", 3) == 0) + amd_iommu_disabled = true; + } + + return 1; +} + +__setup("amd_iommu_dump", parse_amd_iommu_dump); +__setup("amd_iommu=", parse_amd_iommu_options); + +IOMMU_INIT_FINISH(amd_iommu_detect, + gart_iommu_hole_init, + 0, + 0); diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h new file mode 100644 index 00000000000..7ffaa64410b --- /dev/null +++ b/drivers/iommu/amd_iommu_proto.h @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2009-2010 Advanced Micro Devices, Inc. + * Author: Joerg Roedel <joerg.roedel@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _ASM_X86_AMD_IOMMU_PROTO_H +#define _ASM_X86_AMD_IOMMU_PROTO_H + +#include "amd_iommu_types.h" + +extern int amd_iommu_init_dma_ops(void); +extern int amd_iommu_init_passthrough(void); +extern irqreturn_t amd_iommu_int_thread(int irq, void *data); +extern irqreturn_t amd_iommu_int_handler(int irq, void *data); +extern void amd_iommu_apply_erratum_63(u16 devid); +extern void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu); +extern int amd_iommu_init_devices(void); +extern void amd_iommu_uninit_devices(void); +extern void amd_iommu_init_notifier(void); +extern void amd_iommu_init_api(void); +#ifndef CONFIG_AMD_IOMMU_STATS + +static inline void amd_iommu_stats_init(void) { } + +#endif /* !CONFIG_AMD_IOMMU_STATS */ + +static inline bool is_rd890_iommu(struct pci_dev *pdev) +{ + return (pdev->vendor == PCI_VENDOR_ID_ATI) && + (pdev->device == PCI_DEVICE_ID_RD890_IOMMU); +} + +static inline bool iommu_feature(struct amd_iommu *iommu, u64 f) +{ + if (!(iommu->cap & (1 << IOMMU_CAP_EFR))) + return false; + + return !!(iommu->features & f); +} + +#endif /* _ASM_X86_AMD_IOMMU_PROTO_H */ diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h new file mode 100644 index 00000000000..5b9c5075e81 --- /dev/null +++ b/drivers/iommu/amd_iommu_types.h @@ -0,0 +1,585 @@ +/* + * Copyright (C) 2007-2010 Advanced Micro Devices, Inc. + * Author: Joerg Roedel <joerg.roedel@amd.com> + * Leo Duran <leo.duran@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef _ASM_X86_AMD_IOMMU_TYPES_H +#define _ASM_X86_AMD_IOMMU_TYPES_H + +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/list.h> +#include <linux/spinlock.h> + +/* + * Maximum number of IOMMUs supported + */ +#define MAX_IOMMUS 32 + +/* + * some size calculation constants + */ +#define DEV_TABLE_ENTRY_SIZE 32 +#define ALIAS_TABLE_ENTRY_SIZE 2 +#define RLOOKUP_TABLE_ENTRY_SIZE (sizeof(void *)) + +/* Length of the MMIO region for the AMD IOMMU */ +#define MMIO_REGION_LENGTH 0x4000 + +/* Capability offsets used by the driver */ +#define MMIO_CAP_HDR_OFFSET 0x00 +#define MMIO_RANGE_OFFSET 0x0c +#define MMIO_MISC_OFFSET 0x10 + +/* Masks, shifts and macros to parse the device range capability */ +#define MMIO_RANGE_LD_MASK 0xff000000 +#define MMIO_RANGE_FD_MASK 0x00ff0000 +#define MMIO_RANGE_BUS_MASK 0x0000ff00 +#define MMIO_RANGE_LD_SHIFT 24 +#define MMIO_RANGE_FD_SHIFT 16 +#define MMIO_RANGE_BUS_SHIFT 8 +#define MMIO_GET_LD(x) (((x) & MMIO_RANGE_LD_MASK) >> MMIO_RANGE_LD_SHIFT) +#define MMIO_GET_FD(x) (((x) & MMIO_RANGE_FD_MASK) >> MMIO_RANGE_FD_SHIFT) +#define MMIO_GET_BUS(x) (((x) & MMIO_RANGE_BUS_MASK) >> MMIO_RANGE_BUS_SHIFT) +#define MMIO_MSI_NUM(x) ((x) & 0x1f) + +/* Flag masks for the AMD IOMMU exclusion range */ +#define MMIO_EXCL_ENABLE_MASK 0x01ULL +#define MMIO_EXCL_ALLOW_MASK 0x02ULL + +/* Used offsets into the MMIO space */ +#define MMIO_DEV_TABLE_OFFSET 0x0000 +#define MMIO_CMD_BUF_OFFSET 0x0008 +#define MMIO_EVT_BUF_OFFSET 0x0010 +#define MMIO_CONTROL_OFFSET 0x0018 +#define MMIO_EXCL_BASE_OFFSET 0x0020 +#define MMIO_EXCL_LIMIT_OFFSET 0x0028 +#define MMIO_EXT_FEATURES 0x0030 +#define MMIO_CMD_HEAD_OFFSET 0x2000 +#define MMIO_CMD_TAIL_OFFSET 0x2008 +#define MMIO_EVT_HEAD_OFFSET 0x2010 +#define MMIO_EVT_TAIL_OFFSET 0x2018 +#define MMIO_STATUS_OFFSET 0x2020 + + +/* Extended Feature Bits */ +#define FEATURE_PREFETCH (1ULL<<0) +#define FEATURE_PPR (1ULL<<1) +#define FEATURE_X2APIC (1ULL<<2) +#define FEATURE_NX (1ULL<<3) +#define FEATURE_GT (1ULL<<4) +#define FEATURE_IA (1ULL<<6) +#define FEATURE_GA (1ULL<<7) +#define FEATURE_HE (1ULL<<8) +#define FEATURE_PC (1ULL<<9) + +/* MMIO status bits */ +#define MMIO_STATUS_COM_WAIT_INT_MASK 0x04 + +/* event logging constants */ +#define EVENT_ENTRY_SIZE 0x10 +#define EVENT_TYPE_SHIFT 28 +#define EVENT_TYPE_MASK 0xf +#define EVENT_TYPE_ILL_DEV 0x1 +#define EVENT_TYPE_IO_FAULT 0x2 +#define EVENT_TYPE_DEV_TAB_ERR 0x3 +#define EVENT_TYPE_PAGE_TAB_ERR 0x4 +#define EVENT_TYPE_ILL_CMD 0x5 +#define EVENT_TYPE_CMD_HARD_ERR 0x6 +#define EVENT_TYPE_IOTLB_INV_TO 0x7 +#define EVENT_TYPE_INV_DEV_REQ 0x8 +#define EVENT_DEVID_MASK 0xffff +#define EVENT_DEVID_SHIFT 0 +#define EVENT_DOMID_MASK 0xffff +#define EVENT_DOMID_SHIFT 0 +#define EVENT_FLAGS_MASK 0xfff +#define EVENT_FLAGS_SHIFT 0x10 + +/* feature control bits */ +#define CONTROL_IOMMU_EN 0x00ULL +#define CONTROL_HT_TUN_EN 0x01ULL +#define CONTROL_EVT_LOG_EN 0x02ULL +#define CONTROL_EVT_INT_EN 0x03ULL +#define CONTROL_COMWAIT_EN 0x04ULL +#define CONTROL_PASSPW_EN 0x08ULL +#define CONTROL_RESPASSPW_EN 0x09ULL +#define CONTROL_COHERENT_EN 0x0aULL +#define CONTROL_ISOC_EN 0x0bULL +#define CONTROL_CMDBUF_EN 0x0cULL +#define CONTROL_PPFLOG_EN 0x0dULL +#define CONTROL_PPFINT_EN 0x0eULL + +/* command specific defines */ +#define CMD_COMPL_WAIT 0x01 +#define CMD_INV_DEV_ENTRY 0x02 +#define CMD_INV_IOMMU_PAGES 0x03 +#define CMD_INV_IOTLB_PAGES 0x04 +#define CMD_INV_ALL 0x08 + +#define CMD_COMPL_WAIT_STORE_MASK 0x01 +#define CMD_COMPL_WAIT_INT_MASK 0x02 +#define CMD_INV_IOMMU_PAGES_SIZE_MASK 0x01 +#define CMD_INV_IOMMU_PAGES_PDE_MASK 0x02 + +#define CMD_INV_IOMMU_ALL_PAGES_ADDRESS 0x7fffffffffffffffULL + +/* macros and definitions for device table entries */ +#define DEV_ENTRY_VALID 0x00 +#define DEV_ENTRY_TRANSLATION 0x01 +#define DEV_ENTRY_IR 0x3d +#define DEV_ENTRY_IW 0x3e +#define DEV_ENTRY_NO_PAGE_FAULT 0x62 +#define DEV_ENTRY_EX 0x67 +#define DEV_ENTRY_SYSMGT1 0x68 +#define DEV_ENTRY_SYSMGT2 0x69 +#define DEV_ENTRY_INIT_PASS 0xb8 +#define DEV_ENTRY_EINT_PASS 0xb9 +#define DEV_ENTRY_NMI_PASS 0xba +#define DEV_ENTRY_LINT0_PASS 0xbe +#define DEV_ENTRY_LINT1_PASS 0xbf +#define DEV_ENTRY_MODE_MASK 0x07 +#define DEV_ENTRY_MODE_SHIFT 0x09 + +/* constants to configure the command buffer */ +#define CMD_BUFFER_SIZE 8192 +#define CMD_BUFFER_UNINITIALIZED 1 +#define CMD_BUFFER_ENTRIES 512 +#define MMIO_CMD_SIZE_SHIFT 56 +#define MMIO_CMD_SIZE_512 (0x9ULL << MMIO_CMD_SIZE_SHIFT) + +/* constants for event buffer handling */ +#define EVT_BUFFER_SIZE 8192 /* 512 entries */ +#define EVT_LEN_MASK (0x9ULL << 56) + +#define PAGE_MODE_NONE 0x00 +#define PAGE_MODE_1_LEVEL 0x01 +#define PAGE_MODE_2_LEVEL 0x02 +#define PAGE_MODE_3_LEVEL 0x03 +#define PAGE_MODE_4_LEVEL 0x04 +#define PAGE_MODE_5_LEVEL 0x05 +#define PAGE_MODE_6_LEVEL 0x06 + +#define PM_LEVEL_SHIFT(x) (12 + ((x) * 9)) +#define PM_LEVEL_SIZE(x) (((x) < 6) ? \ + ((1ULL << PM_LEVEL_SHIFT((x))) - 1): \ + (0xffffffffffffffffULL)) +#define PM_LEVEL_INDEX(x, a) (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL) +#define PM_LEVEL_ENC(x) (((x) << 9) & 0xe00ULL) +#define PM_LEVEL_PDE(x, a) ((a) | PM_LEVEL_ENC((x)) | \ + IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW) +#define PM_PTE_LEVEL(pte) (((pte) >> 9) & 0x7ULL) + +#define PM_MAP_4k 0 +#define PM_ADDR_MASK 0x000ffffffffff000ULL +#define PM_MAP_MASK(lvl) (PM_ADDR_MASK & \ + (~((1ULL << (12 + ((lvl) * 9))) - 1))) +#define PM_ALIGNED(lvl, addr) ((PM_MAP_MASK(lvl) & (addr)) == (addr)) + +/* + * Returns the page table level to use for a given page size + * Pagesize is expected to be a power-of-two + */ +#define PAGE_SIZE_LEVEL(pagesize) \ + ((__ffs(pagesize) - 12) / 9) +/* + * Returns the number of ptes to use for a given page size + * Pagesize is expected to be a power-of-two + */ +#define PAGE_SIZE_PTE_COUNT(pagesize) \ + (1ULL << ((__ffs(pagesize) - 12) % 9)) + +/* + * Aligns a given io-virtual address to a given page size + * Pagesize is expected to be a power-of-two + */ +#define PAGE_SIZE_ALIGN(address, pagesize) \ + ((address) & ~((pagesize) - 1)) +/* + * Creates an IOMMU PTE for an address an a given pagesize + * The PTE has no permission bits set + * Pagesize is expected to be a power-of-two larger than 4096 + */ +#define PAGE_SIZE_PTE(address, pagesize) \ + (((address) | ((pagesize) - 1)) & \ + (~(pagesize >> 1)) & PM_ADDR_MASK) + +/* + * Takes a PTE value with mode=0x07 and returns the page size it maps + */ +#define PTE_PAGE_SIZE(pte) \ + (1ULL << (1 + ffz(((pte) | 0xfffULL)))) + +#define IOMMU_PTE_P (1ULL << 0) +#define IOMMU_PTE_TV (1ULL << 1) +#define IOMMU_PTE_U (1ULL << 59) +#define IOMMU_PTE_FC (1ULL << 60) +#define IOMMU_PTE_IR (1ULL << 61) +#define IOMMU_PTE_IW (1ULL << 62) + +#define DTE_FLAG_IOTLB 0x01 + +#define IOMMU_PAGE_MASK (((1ULL << 52) - 1) & ~0xfffULL) +#define IOMMU_PTE_PRESENT(pte) ((pte) & IOMMU_PTE_P) +#define IOMMU_PTE_PAGE(pte) (phys_to_virt((pte) & IOMMU_PAGE_MASK)) +#define IOMMU_PTE_MODE(pte) (((pte) >> 9) & 0x07) + +#define IOMMU_PROT_MASK 0x03 +#define IOMMU_PROT_IR 0x01 +#define IOMMU_PROT_IW 0x02 + +/* IOMMU capabilities */ +#define IOMMU_CAP_IOTLB 24 +#define IOMMU_CAP_NPCACHE 26 +#define IOMMU_CAP_EFR 27 + +#define MAX_DOMAIN_ID 65536 + +/* FIXME: move this macro to <linux/pci.h> */ +#define PCI_BUS(x) (((x) >> 8) & 0xff) + +/* Protection domain flags */ +#define PD_DMA_OPS_MASK (1UL << 0) /* domain used for dma_ops */ +#define PD_DEFAULT_MASK (1UL << 1) /* domain is a default dma_ops + domain for an IOMMU */ +#define PD_PASSTHROUGH_MASK (1UL << 2) /* domain has no page + translation */ + +extern bool amd_iommu_dump; +#define DUMP_printk(format, arg...) \ + do { \ + if (amd_iommu_dump) \ + printk(KERN_INFO "AMD-Vi: " format, ## arg); \ + } while(0); + +/* global flag if IOMMUs cache non-present entries */ +extern bool amd_iommu_np_cache; +/* Only true if all IOMMUs support device IOTLBs */ +extern bool amd_iommu_iotlb_sup; + +/* + * Make iterating over all IOMMUs easier + */ +#define for_each_iommu(iommu) \ + list_for_each_entry((iommu), &amd_iommu_list, list) +#define for_each_iommu_safe(iommu, next) \ + list_for_each_entry_safe((iommu), (next), &amd_iommu_list, list) + +#define APERTURE_RANGE_SHIFT 27 /* 128 MB */ +#define APERTURE_RANGE_SIZE (1ULL << APERTURE_RANGE_SHIFT) +#define APERTURE_RANGE_PAGES (APERTURE_RANGE_SIZE >> PAGE_SHIFT) +#define APERTURE_MAX_RANGES 32 /* allows 4GB of DMA address space */ +#define APERTURE_RANGE_INDEX(a) ((a) >> APERTURE_RANGE_SHIFT) +#define APERTURE_PAGE_INDEX(a) (((a) >> 21) & 0x3fULL) + +/* + * This structure contains generic data for IOMMU protection domains + * independent of their use. + */ +struct protection_domain { + struct list_head list; /* for list of all protection domains */ + struct list_head dev_list; /* List of all devices in this domain */ + spinlock_t lock; /* mostly used to lock the page table*/ + struct mutex api_lock; /* protect page tables in the iommu-api path */ + u16 id; /* the domain id written to the device table */ + int mode; /* paging mode (0-6 levels) */ + u64 *pt_root; /* page table root pointer */ + unsigned long flags; /* flags to find out type of domain */ + bool updated; /* complete domain flush required */ + unsigned dev_cnt; /* devices assigned to this domain */ + unsigned dev_iommu[MAX_IOMMUS]; /* per-IOMMU reference count */ + void *priv; /* private data */ + +}; + +/* + * This struct contains device specific data for the IOMMU + */ +struct iommu_dev_data { + struct list_head list; /* For domain->dev_list */ + struct list_head dev_data_list; /* For global dev_data_list */ + struct iommu_dev_data *alias_data;/* The alias dev_data */ + struct protection_domain *domain; /* Domain the device is bound to */ + atomic_t bind; /* Domain attach reverent count */ + u16 devid; /* PCI Device ID */ + struct { + bool enabled; + int qdep; + } ats; /* ATS state */ +}; + +/* + * For dynamic growth the aperture size is split into ranges of 128MB of + * DMA address space each. This struct represents one such range. + */ +struct aperture_range { + + /* address allocation bitmap */ + unsigned long *bitmap; + + /* + * Array of PTE pages for the aperture. In this array we save all the + * leaf pages of the domain page table used for the aperture. This way + * we don't need to walk the page table to find a specific PTE. We can + * just calculate its address in constant time. + */ + u64 *pte_pages[64]; + + unsigned long offset; +}; + +/* + * Data container for a dma_ops specific protection domain + */ +struct dma_ops_domain { + struct list_head list; + + /* generic protection domain information */ + struct protection_domain domain; + + /* size of the aperture for the mappings */ + unsigned long aperture_size; + + /* address we start to search for free addresses */ + unsigned long next_address; + + /* address space relevant data */ + struct aperture_range *aperture[APERTURE_MAX_RANGES]; + + /* This will be set to true when TLB needs to be flushed */ + bool need_flush; + + /* + * if this is a preallocated domain, keep the device for which it was + * preallocated in this variable + */ + u16 target_dev; +}; + +/* + * Structure where we save information about one hardware AMD IOMMU in the + * system. + */ +struct amd_iommu { + struct list_head list; + + /* Index within the IOMMU array */ + int index; + + /* locks the accesses to the hardware */ + spinlock_t lock; + + /* Pointer to PCI device of this IOMMU */ + struct pci_dev *dev; + + /* physical address of MMIO space */ + u64 mmio_phys; + /* virtual address of MMIO space */ + u8 *mmio_base; + + /* capabilities of that IOMMU read from ACPI */ + u32 cap; + + /* flags read from acpi table */ + u8 acpi_flags; + + /* Extended features */ + u64 features; + + /* + * Capability pointer. There could be more than one IOMMU per PCI + * device function if there are more than one AMD IOMMU capability + * pointers. + */ + u16 cap_ptr; + + /* pci domain of this IOMMU */ + u16 pci_seg; + + /* first device this IOMMU handles. read from PCI */ + u16 first_device; + /* last device this IOMMU handles. read from PCI */ + u16 last_device; + + /* start of exclusion range of that IOMMU */ + u64 exclusion_start; + /* length of exclusion range of that IOMMU */ + u64 exclusion_length; + + /* command buffer virtual address */ + u8 *cmd_buf; + /* size of command buffer */ + u32 cmd_buf_size; + + /* size of event buffer */ + u32 evt_buf_size; + /* event buffer virtual address */ + u8 *evt_buf; + /* MSI number for event interrupt */ + u16 evt_msi_num; + + /* true if interrupts for this IOMMU are already enabled */ + bool int_enabled; + + /* if one, we need to send a completion wait command */ + bool need_sync; + + /* default dma_ops domain for that IOMMU */ + struct dma_ops_domain *default_dom; + + /* + * We can't rely on the BIOS to restore all values on reinit, so we + * need to stash them + */ + + /* The iommu BAR */ + u32 stored_addr_lo; + u32 stored_addr_hi; + + /* + * Each iommu has 6 l1s, each of which is documented as having 0x12 + * registers + */ + u32 stored_l1[6][0x12]; + + /* The l2 indirect registers */ + u32 stored_l2[0x83]; +}; + +/* + * List with all IOMMUs in the system. This list is not locked because it is + * only written and read at driver initialization or suspend time + */ +extern struct list_head amd_iommu_list; + +/* + * Array with pointers to each IOMMU struct + * The indices are referenced in the protection domains + */ +extern struct amd_iommu *amd_iommus[MAX_IOMMUS]; + +/* Number of IOMMUs present in the system */ +extern int amd_iommus_present; + +/* + * Declarations for the global list of all protection domains + */ +extern spinlock_t amd_iommu_pd_lock; +extern struct list_head amd_iommu_pd_list; + +/* + * Structure defining one entry in the device table + */ +struct dev_table_entry { + u32 data[8]; +}; + +/* + * One entry for unity mappings parsed out of the ACPI table. + */ +struct unity_map_entry { + struct list_head list; + + /* starting device id this entry is used for (including) */ + u16 devid_start; + /* end device id this entry is used for (including) */ + u16 devid_end; + + /* start address to unity map (including) */ + u64 address_start; + /* end address to unity map (including) */ + u64 address_end; + + /* required protection */ + int prot; +}; + +/* + * List of all unity mappings. It is not locked because as runtime it is only + * read. It is created at ACPI table parsing time. + */ +extern struct list_head amd_iommu_unity_map; + +/* + * Data structures for device handling + */ + +/* + * Device table used by hardware. Read and write accesses by software are + * locked with the amd_iommu_pd_table lock. + */ +extern struct dev_table_entry *amd_iommu_dev_table; + +/* + * Alias table to find requestor ids to device ids. Not locked because only + * read on runtime. + */ +extern u16 *amd_iommu_alias_table; + +/* + * Reverse lookup table to find the IOMMU which translates a specific device. + */ +extern struct amd_iommu **amd_iommu_rlookup_table; + +/* size of the dma_ops aperture as power of 2 */ +extern unsigned amd_iommu_aperture_order; + +/* largest PCI device id we expect translation requests for */ +extern u16 amd_iommu_last_bdf; + +/* allocation bitmap for domain ids */ +extern unsigned long *amd_iommu_pd_alloc_bitmap; + +/* + * If true, the addresses will be flushed on unmap time, not when + * they are reused + */ +extern bool amd_iommu_unmap_flush; + +/* takes bus and device/function and returns the device id + * FIXME: should that be in generic PCI code? */ +static inline u16 calc_devid(u8 bus, u8 devfn) +{ + return (((u16)bus) << 8) | devfn; +} + +#ifdef CONFIG_AMD_IOMMU_STATS + +struct __iommu_counter { + char *name; + struct dentry *dent; + u64 value; +}; + +#define DECLARE_STATS_COUNTER(nm) \ + static struct __iommu_counter nm = { \ + .name = #nm, \ + } + +#define INC_STATS_COUNTER(name) name.value += 1 +#define ADD_STATS_COUNTER(name, x) name.value += (x) +#define SUB_STATS_COUNTER(name, x) name.value -= (x) + +#else /* CONFIG_AMD_IOMMU_STATS */ + +#define DECLARE_STATS_COUNTER(name) +#define INC_STATS_COUNTER(name) +#define ADD_STATS_COUNTER(name, x) +#define SUB_STATS_COUNTER(name, x) + +#endif /* CONFIG_AMD_IOMMU_STATS */ + +#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */ diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c new file mode 100644 index 00000000000..3dc9befa5ae --- /dev/null +++ b/drivers/iommu/dmar.c @@ -0,0 +1,1461 @@ +/* + * Copyright (c) 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Copyright (C) 2006-2008 Intel Corporation + * Author: Ashok Raj <ashok.raj@intel.com> + * Author: Shaohua Li <shaohua.li@intel.com> + * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> + * + * This file implements early detection/parsing of Remapping Devices + * reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI + * tables. + * + * These routines are used by both DMA-remapping and Interrupt-remapping + */ + +#include <linux/pci.h> +#include <linux/dmar.h> +#include <linux/iova.h> +#include <linux/intel-iommu.h> +#include <linux/timer.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/tboot.h> +#include <linux/dmi.h> +#include <linux/slab.h> +#include <asm/iommu_table.h> + +#define PREFIX "DMAR: " + +/* No locks are needed as DMA remapping hardware unit + * list is constructed at boot time and hotplug of + * these units are not supported by the architecture. + */ +LIST_HEAD(dmar_drhd_units); + +static struct acpi_table_header * __initdata dmar_tbl; +static acpi_size dmar_tbl_size; + +static void __init dmar_register_drhd_unit(struct dmar_drhd_unit *drhd) +{ + /* + * add INCLUDE_ALL at the tail, so scan the list will find it at + * the very end. + */ + if (drhd->include_all) + list_add_tail(&drhd->list, &dmar_drhd_units); + else + list_add(&drhd->list, &dmar_drhd_units); +} + +static int __init dmar_parse_one_dev_scope(struct acpi_dmar_device_scope *scope, + struct pci_dev **dev, u16 segment) +{ + struct pci_bus *bus; + struct pci_dev *pdev = NULL; + struct acpi_dmar_pci_path *path; + int count; + + bus = pci_find_bus(segment, scope->bus); + path = (struct acpi_dmar_pci_path *)(scope + 1); + count = (scope->length - sizeof(struct acpi_dmar_device_scope)) + / sizeof(struct acpi_dmar_pci_path); + + while (count) { + if (pdev) + pci_dev_put(pdev); + /* + * Some BIOSes list non-exist devices in DMAR table, just + * ignore it + */ + if (!bus) { + printk(KERN_WARNING + PREFIX "Device scope bus [%d] not found\n", + scope->bus); + break; + } + pdev = pci_get_slot(bus, PCI_DEVFN(path->dev, path->fn)); + if (!pdev) { + printk(KERN_WARNING PREFIX + "Device scope device [%04x:%02x:%02x.%02x] not found\n", + segment, bus->number, path->dev, path->fn); + break; + } + path ++; + count --; + bus = pdev->subordinate; + } + if (!pdev) { + printk(KERN_WARNING PREFIX + "Device scope device [%04x:%02x:%02x.%02x] not found\n", + segment, scope->bus, path->dev, path->fn); + *dev = NULL; + return 0; + } + if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT && \ + pdev->subordinate) || (scope->entry_type == \ + ACPI_DMAR_SCOPE_TYPE_BRIDGE && !pdev->subordinate)) { + pci_dev_put(pdev); + printk(KERN_WARNING PREFIX + "Device scope type does not match for %s\n", + pci_name(pdev)); + return -EINVAL; + } + *dev = pdev; + return 0; +} + +static int __init dmar_parse_dev_scope(void *start, void *end, int *cnt, + struct pci_dev ***devices, u16 segment) +{ + struct acpi_dmar_device_scope *scope; + void * tmp = start; + int index; + int ret; + + *cnt = 0; + while (start < end) { + scope = start; + if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || + scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) + (*cnt)++; + else if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC) { + printk(KERN_WARNING PREFIX + "Unsupported device scope\n"); + } + start += scope->length; + } + if (*cnt == 0) + return 0; + + *devices = kcalloc(*cnt, sizeof(struct pci_dev *), GFP_KERNEL); + if (!*devices) + return -ENOMEM; + + start = tmp; + index = 0; + while (start < end) { + scope = start; + if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT || + scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE) { + ret = dmar_parse_one_dev_scope(scope, + &(*devices)[index], segment); + if (ret) { + kfree(*devices); + return ret; + } + index ++; + } + start += scope->length; + } + + return 0; +} + +/** + * dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition + * structure which uniquely represent one DMA remapping hardware unit + * present in the platform + */ +static int __init +dmar_parse_one_drhd(struct acpi_dmar_header *header) +{ + struct acpi_dmar_hardware_unit *drhd; + struct dmar_drhd_unit *dmaru; + int ret = 0; + + drhd = (struct acpi_dmar_hardware_unit *)header; + dmaru = kzalloc(sizeof(*dmaru), GFP_KERNEL); + if (!dmaru) + return -ENOMEM; + + dmaru->hdr = header; + dmaru->reg_base_addr = drhd->address; + dmaru->segment = drhd->segment; + dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */ + + ret = alloc_iommu(dmaru); + if (ret) { + kfree(dmaru); + return ret; + } + dmar_register_drhd_unit(dmaru); + return 0; +} + +static int __init dmar_parse_dev(struct dmar_drhd_unit *dmaru) +{ + struct acpi_dmar_hardware_unit *drhd; + int ret = 0; + + drhd = (struct acpi_dmar_hardware_unit *) dmaru->hdr; + + if (dmaru->include_all) + return 0; + + ret = dmar_parse_dev_scope((void *)(drhd + 1), + ((void *)drhd) + drhd->header.length, + &dmaru->devices_cnt, &dmaru->devices, + drhd->segment); + if (ret) { + list_del(&dmaru->list); + kfree(dmaru); + } + return ret; +} + +#ifdef CONFIG_DMAR +LIST_HEAD(dmar_rmrr_units); + +static void __init dmar_register_rmrr_unit(struct dmar_rmrr_unit *rmrr) +{ + list_add(&rmrr->list, &dmar_rmrr_units); +} + + +static int __init +dmar_parse_one_rmrr(struct acpi_dmar_header *header) +{ + struct acpi_dmar_reserved_memory *rmrr; + struct dmar_rmrr_unit *rmrru; + + rmrru = kzalloc(sizeof(*rmrru), GFP_KERNEL); + if (!rmrru) + return -ENOMEM; + + rmrru->hdr = header; + rmrr = (struct acpi_dmar_reserved_memory *)header; + rmrru->base_address = rmrr->base_address; + rmrru->end_address = rmrr->end_address; + + dmar_register_rmrr_unit(rmrru); + return 0; +} + +static int __init +rmrr_parse_dev(struct dmar_rmrr_unit *rmrru) +{ + struct acpi_dmar_reserved_memory *rmrr; + int ret; + + rmrr = (struct acpi_dmar_reserved_memory *) rmrru->hdr; + ret = dmar_parse_dev_scope((void *)(rmrr + 1), + ((void *)rmrr) + rmrr->header.length, + &rmrru->devices_cnt, &rmrru->devices, rmrr->segment); + + if (ret || (rmrru->devices_cnt == 0)) { + list_del(&rmrru->list); + kfree(rmrru); + } + return ret; +} + +static LIST_HEAD(dmar_atsr_units); + +static int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr) +{ + struct acpi_dmar_atsr *atsr; + struct dmar_atsr_unit *atsru; + + atsr = container_of(hdr, struct acpi_dmar_atsr, header); + atsru = kzalloc(sizeof(*atsru), GFP_KERNEL); + if (!atsru) + return -ENOMEM; + + atsru->hdr = hdr; + atsru->include_all = atsr->flags & 0x1; + + list_add(&atsru->list, &dmar_atsr_units); + + return 0; +} + +static int __init atsr_parse_dev(struct dmar_atsr_unit *atsru) +{ + int rc; + struct acpi_dmar_atsr *atsr; + + if (atsru->include_all) + return 0; + + atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header); + rc = dmar_parse_dev_scope((void *)(atsr + 1), + (void *)atsr + atsr->header.length, + &atsru->devices_cnt, &atsru->devices, + atsr->segment); + if (rc || !atsru->devices_cnt) { + list_del(&atsru->list); + kfree(atsru); + } + + return rc; +} + +int dmar_find_matched_atsr_unit(struct pci_dev *dev) +{ + int i; + struct pci_bus *bus; + struct acpi_dmar_atsr *atsr; + struct dmar_atsr_unit *atsru; + + dev = pci_physfn(dev); + + list_for_each_entry(atsru, &dmar_atsr_units, list) { + atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header); + if (atsr->segment == pci_domain_nr(dev->bus)) + goto found; + } + + return 0; + +found: + for (bus = dev->bus; bus; bus = bus->parent) { + struct pci_dev *bridge = bus->self; + + if (!bridge || !pci_is_pcie(bridge) || + bridge->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) + return 0; + + if (bridge->pcie_type == PCI_EXP_TYPE_ROOT_PORT) { + for (i = 0; i < atsru->devices_cnt; i++) + if (atsru->devices[i] == bridge) + return 1; + break; + } + } + + if (atsru->include_all) + return 1; + + return 0; +} +#endif + +#ifdef CONFIG_ACPI_NUMA +static int __init +dmar_parse_one_rhsa(struct acpi_dmar_header *header) +{ + struct acpi_dmar_rhsa *rhsa; + struct dmar_drhd_unit *drhd; + + rhsa = (struct acpi_dmar_rhsa *)header; + for_each_drhd_unit(drhd) { + if (drhd->reg_base_addr == rhsa->base_address) { + int node = acpi_map_pxm_to_node(rhsa->proximity_domain); + + if (!node_online(node)) + node = -1; + drhd->iommu->node = node; + return 0; + } + } + WARN_TAINT( + 1, TAINT_FIRMWARE_WORKAROUND, + "Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + drhd->reg_base_addr, + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + + return 0; +} +#endif + +static void __init +dmar_table_print_dmar_entry(struct acpi_dmar_header *header) +{ + struct acpi_dmar_hardware_unit *drhd; + struct acpi_dmar_reserved_memory *rmrr; + struct acpi_dmar_atsr *atsr; + struct acpi_dmar_rhsa *rhsa; + + switch (header->type) { + case ACPI_DMAR_TYPE_HARDWARE_UNIT: + drhd = container_of(header, struct acpi_dmar_hardware_unit, + header); + printk (KERN_INFO PREFIX + "DRHD base: %#016Lx flags: %#x\n", + (unsigned long long)drhd->address, drhd->flags); + break; + case ACPI_DMAR_TYPE_RESERVED_MEMORY: + rmrr = container_of(header, struct acpi_dmar_reserved_memory, + header); + printk (KERN_INFO PREFIX + "RMRR base: %#016Lx end: %#016Lx\n", + (unsigned long long)rmrr->base_address, + (unsigned long long)rmrr->end_address); + break; + case ACPI_DMAR_TYPE_ATSR: + atsr = container_of(header, struct acpi_dmar_atsr, header); + printk(KERN_INFO PREFIX "ATSR flags: %#x\n", atsr->flags); + break; + case ACPI_DMAR_HARDWARE_AFFINITY: + rhsa = container_of(header, struct acpi_dmar_rhsa, header); + printk(KERN_INFO PREFIX "RHSA base: %#016Lx proximity domain: %#x\n", + (unsigned long long)rhsa->base_address, + rhsa->proximity_domain); + break; + } +} + +/** + * dmar_table_detect - checks to see if the platform supports DMAR devices + */ +static int __init dmar_table_detect(void) +{ + acpi_status status = AE_OK; + + /* if we could find DMAR table, then there are DMAR devices */ + status = acpi_get_table_with_size(ACPI_SIG_DMAR, 0, + (struct acpi_table_header **)&dmar_tbl, + &dmar_tbl_size); + + if (ACPI_SUCCESS(status) && !dmar_tbl) { + printk (KERN_WARNING PREFIX "Unable to map DMAR\n"); + status = AE_NOT_FOUND; + } + + return (ACPI_SUCCESS(status) ? 1 : 0); +} + +/** + * parse_dmar_table - parses the DMA reporting table + */ +static int __init +parse_dmar_table(void) +{ + struct acpi_table_dmar *dmar; + struct acpi_dmar_header *entry_header; + int ret = 0; + + /* + * Do it again, earlier dmar_tbl mapping could be mapped with + * fixed map. + */ + dmar_table_detect(); + + /* + * ACPI tables may not be DMA protected by tboot, so use DMAR copy + * SINIT saved in SinitMleData in TXT heap (which is DMA protected) + */ + dmar_tbl = tboot_get_dmar_table(dmar_tbl); + + dmar = (struct acpi_table_dmar *)dmar_tbl; + if (!dmar) + return -ENODEV; + + if (dmar->width < PAGE_SHIFT - 1) { + printk(KERN_WARNING PREFIX "Invalid DMAR haw\n"); + return -EINVAL; + } + + printk (KERN_INFO PREFIX "Host address width %d\n", + dmar->width + 1); + + entry_header = (struct acpi_dmar_header *)(dmar + 1); + while (((unsigned long)entry_header) < + (((unsigned long)dmar) + dmar_tbl->length)) { + /* Avoid looping forever on bad ACPI tables */ + if (entry_header->length == 0) { + printk(KERN_WARNING PREFIX + "Invalid 0-length structure\n"); + ret = -EINVAL; + break; + } + + dmar_table_print_dmar_entry(entry_header); + + switch (entry_header->type) { + case ACPI_DMAR_TYPE_HARDWARE_UNIT: + ret = dmar_parse_one_drhd(entry_header); + break; + case ACPI_DMAR_TYPE_RESERVED_MEMORY: +#ifdef CONFIG_DMAR + ret = dmar_parse_one_rmrr(entry_header); +#endif + break; + case ACPI_DMAR_TYPE_ATSR: +#ifdef CONFIG_DMAR + ret = dmar_parse_one_atsr(entry_header); +#endif + break; + case ACPI_DMAR_HARDWARE_AFFINITY: +#ifdef CONFIG_ACPI_NUMA + ret = dmar_parse_one_rhsa(entry_header); +#endif + break; + default: + printk(KERN_WARNING PREFIX + "Unknown DMAR structure type %d\n", + entry_header->type); + ret = 0; /* for forward compatibility */ + break; + } + if (ret) + break; + + entry_header = ((void *)entry_header + entry_header->length); + } + return ret; +} + +static int dmar_pci_device_match(struct pci_dev *devices[], int cnt, + struct pci_dev *dev) +{ + int index; + + while (dev) { + for (index = 0; index < cnt; index++) + if (dev == devices[index]) + return 1; + + /* Check our parent */ + dev = dev->bus->self; + } + + return 0; +} + +struct dmar_drhd_unit * +dmar_find_matched_drhd_unit(struct pci_dev *dev) +{ + struct dmar_drhd_unit *dmaru = NULL; + struct acpi_dmar_hardware_unit *drhd; + + dev = pci_physfn(dev); + + list_for_each_entry(dmaru, &dmar_drhd_units, list) { + drhd = container_of(dmaru->hdr, + struct acpi_dmar_hardware_unit, + header); + + if (dmaru->include_all && + drhd->segment == pci_domain_nr(dev->bus)) + return dmaru; + + if (dmar_pci_device_match(dmaru->devices, + dmaru->devices_cnt, dev)) + return dmaru; + } + + return NULL; +} + +int __init dmar_dev_scope_init(void) +{ + struct dmar_drhd_unit *drhd, *drhd_n; + int ret = -ENODEV; + + list_for_each_entry_safe(drhd, drhd_n, &dmar_drhd_units, list) { + ret = dmar_parse_dev(drhd); + if (ret) + return ret; + } + +#ifdef CONFIG_DMAR + { + struct dmar_rmrr_unit *rmrr, *rmrr_n; + struct dmar_atsr_unit *atsr, *atsr_n; + + list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) { + ret = rmrr_parse_dev(rmrr); + if (ret) + return ret; + } + + list_for_each_entry_safe(atsr, atsr_n, &dmar_atsr_units, list) { + ret = atsr_parse_dev(atsr); + if (ret) + return ret; + } + } +#endif + + return ret; +} + + +int __init dmar_table_init(void) +{ + static int dmar_table_initialized; + int ret; + + if (dmar_table_initialized) + return 0; + + dmar_table_initialized = 1; + + ret = parse_dmar_table(); + if (ret) { + if (ret != -ENODEV) + printk(KERN_INFO PREFIX "parse DMAR table failure.\n"); + return ret; + } + + if (list_empty(&dmar_drhd_units)) { + printk(KERN_INFO PREFIX "No DMAR devices found\n"); + return -ENODEV; + } + +#ifdef CONFIG_DMAR + if (list_empty(&dmar_rmrr_units)) + printk(KERN_INFO PREFIX "No RMRR found\n"); + + if (list_empty(&dmar_atsr_units)) + printk(KERN_INFO PREFIX "No ATSR found\n"); +#endif + + return 0; +} + +static void warn_invalid_dmar(u64 addr, const char *message) +{ + WARN_TAINT_ONCE( + 1, TAINT_FIRMWARE_WORKAROUND, + "Your BIOS is broken; DMAR reported at address %llx%s!\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + addr, message, + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); +} + +int __init check_zero_address(void) +{ + struct acpi_table_dmar *dmar; + struct acpi_dmar_header *entry_header; + struct acpi_dmar_hardware_unit *drhd; + + dmar = (struct acpi_table_dmar *)dmar_tbl; + entry_header = (struct acpi_dmar_header *)(dmar + 1); + + while (((unsigned long)entry_header) < + (((unsigned long)dmar) + dmar_tbl->length)) { + /* Avoid looping forever on bad ACPI tables */ + if (entry_header->length == 0) { + printk(KERN_WARNING PREFIX + "Invalid 0-length structure\n"); + return 0; + } + + if (entry_header->type == ACPI_DMAR_TYPE_HARDWARE_UNIT) { + void __iomem *addr; + u64 cap, ecap; + + drhd = (void *)entry_header; + if (!drhd->address) { + warn_invalid_dmar(0, ""); + goto failed; + } + + addr = early_ioremap(drhd->address, VTD_PAGE_SIZE); + if (!addr ) { + printk("IOMMU: can't validate: %llx\n", drhd->address); + goto failed; + } + cap = dmar_readq(addr + DMAR_CAP_REG); + ecap = dmar_readq(addr + DMAR_ECAP_REG); + early_iounmap(addr, VTD_PAGE_SIZE); + if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) { + warn_invalid_dmar(drhd->address, + " returns all ones"); + goto failed; + } + } + + entry_header = ((void *)entry_header + entry_header->length); + } + return 1; + +failed: +#ifdef CONFIG_DMAR + dmar_disabled = 1; +#endif + return 0; +} + +int __init detect_intel_iommu(void) +{ + int ret; + + ret = dmar_table_detect(); + if (ret) + ret = check_zero_address(); + { +#ifdef CONFIG_INTR_REMAP + struct acpi_table_dmar *dmar; + + dmar = (struct acpi_table_dmar *) dmar_tbl; + if (ret && cpu_has_x2apic && dmar->flags & 0x1) + printk(KERN_INFO + "Queued invalidation will be enabled to support " + "x2apic and Intr-remapping.\n"); +#endif +#ifdef CONFIG_DMAR + if (ret && !no_iommu && !iommu_detected && !dmar_disabled) { + iommu_detected = 1; + /* Make sure ACS will be enabled */ + pci_request_acs(); + } +#endif +#ifdef CONFIG_X86 + if (ret) + x86_init.iommu.iommu_init = intel_iommu_init; +#endif + } + early_acpi_os_unmap_memory(dmar_tbl, dmar_tbl_size); + dmar_tbl = NULL; + + return ret ? 1 : -ENODEV; +} + + +int alloc_iommu(struct dmar_drhd_unit *drhd) +{ + struct intel_iommu *iommu; + int map_size; + u32 ver; + static int iommu_allocated = 0; + int agaw = 0; + int msagaw = 0; + + if (!drhd->reg_base_addr) { + warn_invalid_dmar(0, ""); + return -EINVAL; + } + + iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); + if (!iommu) + return -ENOMEM; + + iommu->seq_id = iommu_allocated++; + sprintf (iommu->name, "dmar%d", iommu->seq_id); + + iommu->reg = ioremap(drhd->reg_base_addr, VTD_PAGE_SIZE); + if (!iommu->reg) { + printk(KERN_ERR "IOMMU: can't map the region\n"); + goto error; + } + iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG); + iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG); + + if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) { + warn_invalid_dmar(drhd->reg_base_addr, " returns all ones"); + goto err_unmap; + } + +#ifdef CONFIG_DMAR + agaw = iommu_calculate_agaw(iommu); + if (agaw < 0) { + printk(KERN_ERR + "Cannot get a valid agaw for iommu (seq_id = %d)\n", + iommu->seq_id); + goto err_unmap; + } + msagaw = iommu_calculate_max_sagaw(iommu); + if (msagaw < 0) { + printk(KERN_ERR + "Cannot get a valid max agaw for iommu (seq_id = %d)\n", + iommu->seq_id); + goto err_unmap; + } +#endif + iommu->agaw = agaw; + iommu->msagaw = msagaw; + + iommu->node = -1; + + /* the registers might be more than one page */ + map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), + cap_max_fault_reg_offset(iommu->cap)); + map_size = VTD_PAGE_ALIGN(map_size); + if (map_size > VTD_PAGE_SIZE) { + iounmap(iommu->reg); + iommu->reg = ioremap(drhd->reg_base_addr, map_size); + if (!iommu->reg) { + printk(KERN_ERR "IOMMU: can't map the region\n"); + goto error; + } + } + + ver = readl(iommu->reg + DMAR_VER_REG); + pr_info("IOMMU %d: reg_base_addr %llx ver %d:%d cap %llx ecap %llx\n", + iommu->seq_id, + (unsigned long long)drhd->reg_base_addr, + DMAR_VER_MAJOR(ver), DMAR_VER_MINOR(ver), + (unsigned long long)iommu->cap, + (unsigned long long)iommu->ecap); + + spin_lock_init(&iommu->register_lock); + + drhd->iommu = iommu; + return 0; + + err_unmap: + iounmap(iommu->reg); + error: + kfree(iommu); + return -1; +} + +void free_iommu(struct intel_iommu *iommu) +{ + if (!iommu) + return; + +#ifdef CONFIG_DMAR + free_dmar_iommu(iommu); +#endif + + if (iommu->reg) + iounmap(iommu->reg); + kfree(iommu); +} + +/* + * Reclaim all the submitted descriptors which have completed its work. + */ +static inline void reclaim_free_desc(struct q_inval *qi) +{ + while (qi->desc_status[qi->free_tail] == QI_DONE || + qi->desc_status[qi->free_tail] == QI_ABORT) { + qi->desc_status[qi->free_tail] = QI_FREE; + qi->free_tail = (qi->free_tail + 1) % QI_LENGTH; + qi->free_cnt++; + } +} + +static int qi_check_fault(struct intel_iommu *iommu, int index) +{ + u32 fault; + int head, tail; + struct q_inval *qi = iommu->qi; + int wait_index = (index + 1) % QI_LENGTH; + + if (qi->desc_status[wait_index] == QI_ABORT) + return -EAGAIN; + + fault = readl(iommu->reg + DMAR_FSTS_REG); + + /* + * If IQE happens, the head points to the descriptor associated + * with the error. No new descriptors are fetched until the IQE + * is cleared. + */ + if (fault & DMA_FSTS_IQE) { + head = readl(iommu->reg + DMAR_IQH_REG); + if ((head >> DMAR_IQ_SHIFT) == index) { + printk(KERN_ERR "VT-d detected invalid descriptor: " + "low=%llx, high=%llx\n", + (unsigned long long)qi->desc[index].low, + (unsigned long long)qi->desc[index].high); + memcpy(&qi->desc[index], &qi->desc[wait_index], + sizeof(struct qi_desc)); + __iommu_flush_cache(iommu, &qi->desc[index], + sizeof(struct qi_desc)); + writel(DMA_FSTS_IQE, iommu->reg + DMAR_FSTS_REG); + return -EINVAL; + } + } + + /* + * If ITE happens, all pending wait_desc commands are aborted. + * No new descriptors are fetched until the ITE is cleared. + */ + if (fault & DMA_FSTS_ITE) { + head = readl(iommu->reg + DMAR_IQH_REG); + head = ((head >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; + head |= 1; + tail = readl(iommu->reg + DMAR_IQT_REG); + tail = ((tail >> DMAR_IQ_SHIFT) - 1 + QI_LENGTH) % QI_LENGTH; + + writel(DMA_FSTS_ITE, iommu->reg + DMAR_FSTS_REG); + + do { + if (qi->desc_status[head] == QI_IN_USE) + qi->desc_status[head] = QI_ABORT; + head = (head - 2 + QI_LENGTH) % QI_LENGTH; + } while (head != tail); + + if (qi->desc_status[wait_index] == QI_ABORT) + return -EAGAIN; + } + + if (fault & DMA_FSTS_ICE) + writel(DMA_FSTS_ICE, iommu->reg + DMAR_FSTS_REG); + + return 0; +} + +/* + * Submit the queued invalidation descriptor to the remapping + * hardware unit and wait for its completion. + */ +int qi_submit_sync(struct qi_desc *desc, struct intel_iommu *iommu) +{ + int rc; + struct q_inval *qi = iommu->qi; + struct qi_desc *hw, wait_desc; + int wait_index, index; + unsigned long flags; + + if (!qi) + return 0; + + hw = qi->desc; + +restart: + rc = 0; + + spin_lock_irqsave(&qi->q_lock, flags); + while (qi->free_cnt < 3) { + spin_unlock_irqrestore(&qi->q_lock, flags); + cpu_relax(); + spin_lock_irqsave(&qi->q_lock, flags); + } + + index = qi->free_head; + wait_index = (index + 1) % QI_LENGTH; + + qi->desc_status[index] = qi->desc_status[wait_index] = QI_IN_USE; + + hw[index] = *desc; + + wait_desc.low = QI_IWD_STATUS_DATA(QI_DONE) | + QI_IWD_STATUS_WRITE | QI_IWD_TYPE; + wait_desc.high = virt_to_phys(&qi->desc_status[wait_index]); + + hw[wait_index] = wait_desc; + + __iommu_flush_cache(iommu, &hw[index], sizeof(struct qi_desc)); + __iommu_flush_cache(iommu, &hw[wait_index], sizeof(struct qi_desc)); + + qi->free_head = (qi->free_head + 2) % QI_LENGTH; + qi->free_cnt -= 2; + + /* + * update the HW tail register indicating the presence of + * new descriptors. + */ + writel(qi->free_head << DMAR_IQ_SHIFT, iommu->reg + DMAR_IQT_REG); + + while (qi->desc_status[wait_index] != QI_DONE) { + /* + * We will leave the interrupts disabled, to prevent interrupt + * context to queue another cmd while a cmd is already submitted + * and waiting for completion on this cpu. This is to avoid + * a deadlock where the interrupt context can wait indefinitely + * for free slots in the queue. + */ + rc = qi_check_fault(iommu, index); + if (rc) + break; + + spin_unlock(&qi->q_lock); + cpu_relax(); + spin_lock(&qi->q_lock); + } + + qi->desc_status[index] = QI_DONE; + + reclaim_free_desc(qi); + spin_unlock_irqrestore(&qi->q_lock, flags); + + if (rc == -EAGAIN) + goto restart; + + return rc; +} + +/* + * Flush the global interrupt entry cache. + */ +void qi_global_iec(struct intel_iommu *iommu) +{ + struct qi_desc desc; + + desc.low = QI_IEC_TYPE; + desc.high = 0; + + /* should never fail */ + qi_submit_sync(&desc, iommu); +} + +void qi_flush_context(struct intel_iommu *iommu, u16 did, u16 sid, u8 fm, + u64 type) +{ + struct qi_desc desc; + + desc.low = QI_CC_FM(fm) | QI_CC_SID(sid) | QI_CC_DID(did) + | QI_CC_GRAN(type) | QI_CC_TYPE; + desc.high = 0; + + qi_submit_sync(&desc, iommu); +} + +void qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr, + unsigned int size_order, u64 type) +{ + u8 dw = 0, dr = 0; + + struct qi_desc desc; + int ih = 0; + + if (cap_write_drain(iommu->cap)) + dw = 1; + + if (cap_read_drain(iommu->cap)) + dr = 1; + + desc.low = QI_IOTLB_DID(did) | QI_IOTLB_DR(dr) | QI_IOTLB_DW(dw) + | QI_IOTLB_GRAN(type) | QI_IOTLB_TYPE; + desc.high = QI_IOTLB_ADDR(addr) | QI_IOTLB_IH(ih) + | QI_IOTLB_AM(size_order); + + qi_submit_sync(&desc, iommu); +} + +void qi_flush_dev_iotlb(struct intel_iommu *iommu, u16 sid, u16 qdep, + u64 addr, unsigned mask) +{ + struct qi_desc desc; + + if (mask) { + BUG_ON(addr & ((1 << (VTD_PAGE_SHIFT + mask)) - 1)); + addr |= (1 << (VTD_PAGE_SHIFT + mask - 1)) - 1; + desc.high = QI_DEV_IOTLB_ADDR(addr) | QI_DEV_IOTLB_SIZE; + } else + desc.high = QI_DEV_IOTLB_ADDR(addr); + + if (qdep >= QI_DEV_IOTLB_MAX_INVS) + qdep = 0; + + desc.low = QI_DEV_IOTLB_SID(sid) | QI_DEV_IOTLB_QDEP(qdep) | + QI_DIOTLB_TYPE; + + qi_submit_sync(&desc, iommu); +} + +/* + * Disable Queued Invalidation interface. + */ +void dmar_disable_qi(struct intel_iommu *iommu) +{ + unsigned long flags; + u32 sts; + cycles_t start_time = get_cycles(); + + if (!ecap_qis(iommu->ecap)) + return; + + spin_lock_irqsave(&iommu->register_lock, flags); + + sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); + if (!(sts & DMA_GSTS_QIES)) + goto end; + + /* + * Give a chance to HW to complete the pending invalidation requests. + */ + while ((readl(iommu->reg + DMAR_IQT_REG) != + readl(iommu->reg + DMAR_IQH_REG)) && + (DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time))) + cpu_relax(); + + iommu->gcmd &= ~DMA_GCMD_QIE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, + !(sts & DMA_GSTS_QIES), sts); +end: + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +/* + * Enable queued invalidation. + */ +static void __dmar_enable_qi(struct intel_iommu *iommu) +{ + u32 sts; + unsigned long flags; + struct q_inval *qi = iommu->qi; + + qi->free_head = qi->free_tail = 0; + qi->free_cnt = QI_LENGTH; + + spin_lock_irqsave(&iommu->register_lock, flags); + + /* write zero to the tail reg */ + writel(0, iommu->reg + DMAR_IQT_REG); + + dmar_writeq(iommu->reg + DMAR_IQA_REG, virt_to_phys(qi->desc)); + + iommu->gcmd |= DMA_GCMD_QIE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl, (sts & DMA_GSTS_QIES), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +/* + * Enable Queued Invalidation interface. This is a must to support + * interrupt-remapping. Also used by DMA-remapping, which replaces + * register based IOTLB invalidation. + */ +int dmar_enable_qi(struct intel_iommu *iommu) +{ + struct q_inval *qi; + struct page *desc_page; + + if (!ecap_qis(iommu->ecap)) + return -ENOENT; + + /* + * queued invalidation is already setup and enabled. + */ + if (iommu->qi) + return 0; + + iommu->qi = kmalloc(sizeof(*qi), GFP_ATOMIC); + if (!iommu->qi) + return -ENOMEM; + + qi = iommu->qi; + + + desc_page = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, 0); + if (!desc_page) { + kfree(qi); + iommu->qi = 0; + return -ENOMEM; + } + + qi->desc = page_address(desc_page); + + qi->desc_status = kmalloc(QI_LENGTH * sizeof(int), GFP_ATOMIC); + if (!qi->desc_status) { + free_page((unsigned long) qi->desc); + kfree(qi); + iommu->qi = 0; + return -ENOMEM; + } + + qi->free_head = qi->free_tail = 0; + qi->free_cnt = QI_LENGTH; + + spin_lock_init(&qi->q_lock); + + __dmar_enable_qi(iommu); + + return 0; +} + +/* iommu interrupt handling. Most stuff are MSI-like. */ + +enum faulttype { + DMA_REMAP, + INTR_REMAP, + UNKNOWN, +}; + +static const char *dma_remap_fault_reasons[] = +{ + "Software", + "Present bit in root entry is clear", + "Present bit in context entry is clear", + "Invalid context entry", + "Access beyond MGAW", + "PTE Write access is not set", + "PTE Read access is not set", + "Next page table ptr is invalid", + "Root table address invalid", + "Context table ptr is invalid", + "non-zero reserved fields in RTP", + "non-zero reserved fields in CTP", + "non-zero reserved fields in PTE", +}; + +static const char *intr_remap_fault_reasons[] = +{ + "Detected reserved fields in the decoded interrupt-remapped request", + "Interrupt index exceeded the interrupt-remapping table size", + "Present field in the IRTE entry is clear", + "Error accessing interrupt-remapping table pointed by IRTA_REG", + "Detected reserved fields in the IRTE entry", + "Blocked a compatibility format interrupt request", + "Blocked an interrupt request due to source-id verification failure", +}; + +#define MAX_FAULT_REASON_IDX (ARRAY_SIZE(fault_reason_strings) - 1) + +const char *dmar_get_fault_reason(u8 fault_reason, int *fault_type) +{ + if (fault_reason >= 0x20 && (fault_reason <= 0x20 + + ARRAY_SIZE(intr_remap_fault_reasons))) { + *fault_type = INTR_REMAP; + return intr_remap_fault_reasons[fault_reason - 0x20]; + } else if (fault_reason < ARRAY_SIZE(dma_remap_fault_reasons)) { + *fault_type = DMA_REMAP; + return dma_remap_fault_reasons[fault_reason]; + } else { + *fault_type = UNKNOWN; + return "Unknown"; + } +} + +void dmar_msi_unmask(struct irq_data *data) +{ + struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); + unsigned long flag; + + /* unmask it */ + spin_lock_irqsave(&iommu->register_lock, flag); + writel(0, iommu->reg + DMAR_FECTL_REG); + /* Read a reg to force flush the post write */ + readl(iommu->reg + DMAR_FECTL_REG); + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_mask(struct irq_data *data) +{ + unsigned long flag; + struct intel_iommu *iommu = irq_data_get_irq_handler_data(data); + + /* mask it */ + spin_lock_irqsave(&iommu->register_lock, flag); + writel(DMA_FECTL_IM, iommu->reg + DMAR_FECTL_REG); + /* Read a reg to force flush the post write */ + readl(iommu->reg + DMAR_FECTL_REG); + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_write(int irq, struct msi_msg *msg) +{ + struct intel_iommu *iommu = irq_get_handler_data(irq); + unsigned long flag; + + spin_lock_irqsave(&iommu->register_lock, flag); + writel(msg->data, iommu->reg + DMAR_FEDATA_REG); + writel(msg->address_lo, iommu->reg + DMAR_FEADDR_REG); + writel(msg->address_hi, iommu->reg + DMAR_FEUADDR_REG); + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +void dmar_msi_read(int irq, struct msi_msg *msg) +{ + struct intel_iommu *iommu = irq_get_handler_data(irq); + unsigned long flag; + + spin_lock_irqsave(&iommu->register_lock, flag); + msg->data = readl(iommu->reg + DMAR_FEDATA_REG); + msg->address_lo = readl(iommu->reg + DMAR_FEADDR_REG); + msg->address_hi = readl(iommu->reg + DMAR_FEUADDR_REG); + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +static int dmar_fault_do_one(struct intel_iommu *iommu, int type, + u8 fault_reason, u16 source_id, unsigned long long addr) +{ + const char *reason; + int fault_type; + + reason = dmar_get_fault_reason(fault_reason, &fault_type); + + if (fault_type == INTR_REMAP) + printk(KERN_ERR "INTR-REMAP: Request device [[%02x:%02x.%d] " + "fault index %llx\n" + "INTR-REMAP:[fault reason %02d] %s\n", + (source_id >> 8), PCI_SLOT(source_id & 0xFF), + PCI_FUNC(source_id & 0xFF), addr >> 48, + fault_reason, reason); + else + printk(KERN_ERR + "DMAR:[%s] Request device [%02x:%02x.%d] " + "fault addr %llx \n" + "DMAR:[fault reason %02d] %s\n", + (type ? "DMA Read" : "DMA Write"), + (source_id >> 8), PCI_SLOT(source_id & 0xFF), + PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); + return 0; +} + +#define PRIMARY_FAULT_REG_LEN (16) +irqreturn_t dmar_fault(int irq, void *dev_id) +{ + struct intel_iommu *iommu = dev_id; + int reg, fault_index; + u32 fault_status; + unsigned long flag; + + spin_lock_irqsave(&iommu->register_lock, flag); + fault_status = readl(iommu->reg + DMAR_FSTS_REG); + if (fault_status) + printk(KERN_ERR "DRHD: handling fault status reg %x\n", + fault_status); + + /* TBD: ignore advanced fault log currently */ + if (!(fault_status & DMA_FSTS_PPF)) + goto clear_rest; + + fault_index = dma_fsts_fault_record_index(fault_status); + reg = cap_fault_reg_offset(iommu->cap); + while (1) { + u8 fault_reason; + u16 source_id; + u64 guest_addr; + int type; + u32 data; + + /* highest 32 bits */ + data = readl(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 12); + if (!(data & DMA_FRCD_F)) + break; + + fault_reason = dma_frcd_fault_reason(data); + type = dma_frcd_type(data); + + data = readl(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 8); + source_id = dma_frcd_source_id(data); + + guest_addr = dmar_readq(iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN); + guest_addr = dma_frcd_page_addr(guest_addr); + /* clear the fault */ + writel(DMA_FRCD_F, iommu->reg + reg + + fault_index * PRIMARY_FAULT_REG_LEN + 12); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + + dmar_fault_do_one(iommu, type, fault_reason, + source_id, guest_addr); + + fault_index++; + if (fault_index >= cap_num_fault_regs(iommu->cap)) + fault_index = 0; + spin_lock_irqsave(&iommu->register_lock, flag); + } +clear_rest: + /* clear all the other faults */ + fault_status = readl(iommu->reg + DMAR_FSTS_REG); + writel(fault_status, iommu->reg + DMAR_FSTS_REG); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + return IRQ_HANDLED; +} + +int dmar_set_interrupt(struct intel_iommu *iommu) +{ + int irq, ret; + + /* + * Check if the fault interrupt is already initialized. + */ + if (iommu->irq) + return 0; + + irq = create_irq(); + if (!irq) { + printk(KERN_ERR "IOMMU: no free vectors\n"); + return -EINVAL; + } + + irq_set_handler_data(irq, iommu); + iommu->irq = irq; + + ret = arch_setup_dmar_msi(irq); + if (ret) { + irq_set_handler_data(irq, NULL); + iommu->irq = 0; + destroy_irq(irq); + return ret; + } + + ret = request_irq(irq, dmar_fault, 0, iommu->name, iommu); + if (ret) + printk(KERN_ERR "IOMMU: can't request irq\n"); + return ret; +} + +int __init enable_drhd_fault_handling(void) +{ + struct dmar_drhd_unit *drhd; + + /* + * Enable fault control interrupt. + */ + for_each_drhd_unit(drhd) { + int ret; + struct intel_iommu *iommu = drhd->iommu; + ret = dmar_set_interrupt(iommu); + + if (ret) { + printk(KERN_ERR "DRHD %Lx: failed to enable fault, " + " interrupt, ret %d\n", + (unsigned long long)drhd->reg_base_addr, ret); + return -1; + } + + /* + * Clear any previous faults. + */ + dmar_fault(iommu->irq, iommu); + } + + return 0; +} + +/* + * Re-enable Queued Invalidation interface. + */ +int dmar_reenable_qi(struct intel_iommu *iommu) +{ + if (!ecap_qis(iommu->ecap)) + return -ENOENT; + + if (!iommu->qi) + return -ENOENT; + + /* + * First disable queued invalidation. + */ + dmar_disable_qi(iommu); + /* + * Then enable queued invalidation again. Since there is no pending + * invalidation requests now, it's safe to re-enable queued + * invalidation. + */ + __dmar_enable_qi(iommu); + + return 0; +} + +/* + * Check interrupt remapping support in DMAR table description. + */ +int __init dmar_ir_support(void) +{ + struct acpi_table_dmar *dmar; + dmar = (struct acpi_table_dmar *)dmar_tbl; + if (!dmar) + return 0; + return dmar->flags & 0x1; +} +IOMMU_INIT_POST(detect_intel_iommu); diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c new file mode 100644 index 00000000000..c621c98c99d --- /dev/null +++ b/drivers/iommu/intel-iommu.c @@ -0,0 +1,4016 @@ +/* + * Copyright (c) 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Copyright (C) 2006-2008 Intel Corporation + * Author: Ashok Raj <ashok.raj@intel.com> + * Author: Shaohua Li <shaohua.li@intel.com> + * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> + * Author: Fenghua Yu <fenghua.yu@intel.com> + */ + +#include <linux/init.h> +#include <linux/bitmap.h> +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/pci.h> +#include <linux/dmar.h> +#include <linux/dma-mapping.h> +#include <linux/mempool.h> +#include <linux/timer.h> +#include <linux/iova.h> +#include <linux/iommu.h> +#include <linux/intel-iommu.h> +#include <linux/syscore_ops.h> +#include <linux/tboot.h> +#include <linux/dmi.h> +#include <linux/pci-ats.h> +#include <asm/cacheflush.h> +#include <asm/iommu.h> + +#define ROOT_SIZE VTD_PAGE_SIZE +#define CONTEXT_SIZE VTD_PAGE_SIZE + +#define IS_BRIDGE_HOST_DEVICE(pdev) \ + ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST) +#define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY) +#define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) +#define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e) + +#define IOAPIC_RANGE_START (0xfee00000) +#define IOAPIC_RANGE_END (0xfeefffff) +#define IOVA_START_ADDR (0x1000) + +#define DEFAULT_DOMAIN_ADDRESS_WIDTH 48 + +#define MAX_AGAW_WIDTH 64 + +#define __DOMAIN_MAX_PFN(gaw) ((((uint64_t)1) << (gaw-VTD_PAGE_SHIFT)) - 1) +#define __DOMAIN_MAX_ADDR(gaw) ((((uint64_t)1) << gaw) - 1) + +/* We limit DOMAIN_MAX_PFN to fit in an unsigned long, and DOMAIN_MAX_ADDR + to match. That way, we can use 'unsigned long' for PFNs with impunity. */ +#define DOMAIN_MAX_PFN(gaw) ((unsigned long) min_t(uint64_t, \ + __DOMAIN_MAX_PFN(gaw), (unsigned long)-1)) +#define DOMAIN_MAX_ADDR(gaw) (((uint64_t)__DOMAIN_MAX_PFN(gaw)) << VTD_PAGE_SHIFT) + +#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT) +#define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32)) +#define DMA_64BIT_PFN IOVA_PFN(DMA_BIT_MASK(64)) + +/* page table handling */ +#define LEVEL_STRIDE (9) +#define LEVEL_MASK (((u64)1 << LEVEL_STRIDE) - 1) + +static inline int agaw_to_level(int agaw) +{ + return agaw + 2; +} + +static inline int agaw_to_width(int agaw) +{ + return 30 + agaw * LEVEL_STRIDE; +} + +static inline int width_to_agaw(int width) +{ + return (width - 30) / LEVEL_STRIDE; +} + +static inline unsigned int level_to_offset_bits(int level) +{ + return (level - 1) * LEVEL_STRIDE; +} + +static inline int pfn_level_offset(unsigned long pfn, int level) +{ + return (pfn >> level_to_offset_bits(level)) & LEVEL_MASK; +} + +static inline unsigned long level_mask(int level) +{ + return -1UL << level_to_offset_bits(level); +} + +static inline unsigned long level_size(int level) +{ + return 1UL << level_to_offset_bits(level); +} + +static inline unsigned long align_to_level(unsigned long pfn, int level) +{ + return (pfn + level_size(level) - 1) & level_mask(level); +} + +static inline unsigned long lvl_to_nr_pages(unsigned int lvl) +{ + return 1 << ((lvl - 1) * LEVEL_STRIDE); +} + +/* VT-d pages must always be _smaller_ than MM pages. Otherwise things + are never going to work. */ +static inline unsigned long dma_to_mm_pfn(unsigned long dma_pfn) +{ + return dma_pfn >> (PAGE_SHIFT - VTD_PAGE_SHIFT); +} + +static inline unsigned long mm_to_dma_pfn(unsigned long mm_pfn) +{ + return mm_pfn << (PAGE_SHIFT - VTD_PAGE_SHIFT); +} +static inline unsigned long page_to_dma_pfn(struct page *pg) +{ + return mm_to_dma_pfn(page_to_pfn(pg)); +} +static inline unsigned long virt_to_dma_pfn(void *p) +{ + return page_to_dma_pfn(virt_to_page(p)); +} + +/* global iommu list, set NULL for ignored DMAR units */ +static struct intel_iommu **g_iommus; + +static void __init check_tylersburg_isoch(void); +static int rwbf_quirk; + +/* + * set to 1 to panic kernel if can't successfully enable VT-d + * (used when kernel is launched w/ TXT) + */ +static int force_on = 0; + +/* + * 0: Present + * 1-11: Reserved + * 12-63: Context Ptr (12 - (haw-1)) + * 64-127: Reserved + */ +struct root_entry { + u64 val; + u64 rsvd1; +}; +#define ROOT_ENTRY_NR (VTD_PAGE_SIZE/sizeof(struct root_entry)) +static inline bool root_present(struct root_entry *root) +{ + return (root->val & 1); +} +static inline void set_root_present(struct root_entry *root) +{ + root->val |= 1; +} +static inline void set_root_value(struct root_entry *root, unsigned long value) +{ + root->val |= value & VTD_PAGE_MASK; +} + +static inline struct context_entry * +get_context_addr_from_root(struct root_entry *root) +{ + return (struct context_entry *) + (root_present(root)?phys_to_virt( + root->val & VTD_PAGE_MASK) : + NULL); +} + +/* + * low 64 bits: + * 0: present + * 1: fault processing disable + * 2-3: translation type + * 12-63: address space root + * high 64 bits: + * 0-2: address width + * 3-6: aval + * 8-23: domain id + */ +struct context_entry { + u64 lo; + u64 hi; +}; + +static inline bool context_present(struct context_entry *context) +{ + return (context->lo & 1); +} +static inline void context_set_present(struct context_entry *context) +{ + context->lo |= 1; +} + +static inline void context_set_fault_enable(struct context_entry *context) +{ + context->lo &= (((u64)-1) << 2) | 1; +} + +static inline void context_set_translation_type(struct context_entry *context, + unsigned long value) +{ + context->lo &= (((u64)-1) << 4) | 3; + context->lo |= (value & 3) << 2; +} + +static inline void context_set_address_root(struct context_entry *context, + unsigned long value) +{ + context->lo |= value & VTD_PAGE_MASK; +} + +static inline void context_set_address_width(struct context_entry *context, + unsigned long value) +{ + context->hi |= value & 7; +} + +static inline void context_set_domain_id(struct context_entry *context, + unsigned long value) +{ + context->hi |= (value & ((1 << 16) - 1)) << 8; +} + +static inline void context_clear_entry(struct context_entry *context) +{ + context->lo = 0; + context->hi = 0; +} + +/* + * 0: readable + * 1: writable + * 2-6: reserved + * 7: super page + * 8-10: available + * 11: snoop behavior + * 12-63: Host physcial address + */ +struct dma_pte { + u64 val; +}; + +static inline void dma_clear_pte(struct dma_pte *pte) +{ + pte->val = 0; +} + +static inline void dma_set_pte_readable(struct dma_pte *pte) +{ + pte->val |= DMA_PTE_READ; +} + +static inline void dma_set_pte_writable(struct dma_pte *pte) +{ + pte->val |= DMA_PTE_WRITE; +} + +static inline void dma_set_pte_snp(struct dma_pte *pte) +{ + pte->val |= DMA_PTE_SNP; +} + +static inline void dma_set_pte_prot(struct dma_pte *pte, unsigned long prot) +{ + pte->val = (pte->val & ~3) | (prot & 3); +} + +static inline u64 dma_pte_addr(struct dma_pte *pte) +{ +#ifdef CONFIG_64BIT + return pte->val & VTD_PAGE_MASK; +#else + /* Must have a full atomic 64-bit read */ + return __cmpxchg64(&pte->val, 0ULL, 0ULL) & VTD_PAGE_MASK; +#endif +} + +static inline void dma_set_pte_pfn(struct dma_pte *pte, unsigned long pfn) +{ + pte->val |= (uint64_t)pfn << VTD_PAGE_SHIFT; +} + +static inline bool dma_pte_present(struct dma_pte *pte) +{ + return (pte->val & 3) != 0; +} + +static inline int first_pte_in_page(struct dma_pte *pte) +{ + return !((unsigned long)pte & ~VTD_PAGE_MASK); +} + +/* + * This domain is a statically identity mapping domain. + * 1. This domain creats a static 1:1 mapping to all usable memory. + * 2. It maps to each iommu if successful. + * 3. Each iommu mapps to this domain if successful. + */ +static struct dmar_domain *si_domain; +static int hw_pass_through = 1; + +/* devices under the same p2p bridge are owned in one domain */ +#define DOMAIN_FLAG_P2P_MULTIPLE_DEVICES (1 << 0) + +/* domain represents a virtual machine, more than one devices + * across iommus may be owned in one domain, e.g. kvm guest. + */ +#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 1) + +/* si_domain contains mulitple devices */ +#define DOMAIN_FLAG_STATIC_IDENTITY (1 << 2) + +struct dmar_domain { + int id; /* domain id */ + int nid; /* node id */ + unsigned long iommu_bmp; /* bitmap of iommus this domain uses*/ + + struct list_head devices; /* all devices' list */ + struct iova_domain iovad; /* iova's that belong to this domain */ + + struct dma_pte *pgd; /* virtual address */ + int gaw; /* max guest address width */ + + /* adjusted guest address width, 0 is level 2 30-bit */ + int agaw; + + int flags; /* flags to find out type of domain */ + + int iommu_coherency;/* indicate coherency of iommu access */ + int iommu_snooping; /* indicate snooping control feature*/ + int iommu_count; /* reference count of iommu */ + int iommu_superpage;/* Level of superpages supported: + 0 == 4KiB (no superpages), 1 == 2MiB, + 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */ + spinlock_t iommu_lock; /* protect iommu set in domain */ + u64 max_addr; /* maximum mapped address */ +}; + +/* PCI domain-device relationship */ +struct device_domain_info { + struct list_head link; /* link to domain siblings */ + struct list_head global; /* link to global list */ + int segment; /* PCI domain */ + u8 bus; /* PCI bus number */ + u8 devfn; /* PCI devfn number */ + struct pci_dev *dev; /* it's NULL for PCIe-to-PCI bridge */ + struct intel_iommu *iommu; /* IOMMU used by this device */ + struct dmar_domain *domain; /* pointer to domain */ +}; + +static void flush_unmaps_timeout(unsigned long data); + +DEFINE_TIMER(unmap_timer, flush_unmaps_timeout, 0, 0); + +#define HIGH_WATER_MARK 250 +struct deferred_flush_tables { + int next; + struct iova *iova[HIGH_WATER_MARK]; + struct dmar_domain *domain[HIGH_WATER_MARK]; +}; + +static struct deferred_flush_tables *deferred_flush; + +/* bitmap for indexing intel_iommus */ +static int g_num_of_iommus; + +static DEFINE_SPINLOCK(async_umap_flush_lock); +static LIST_HEAD(unmaps_to_do); + +static int timer_on; +static long list_size; + +static void domain_remove_dev_info(struct dmar_domain *domain); + +#ifdef CONFIG_DMAR_DEFAULT_ON +int dmar_disabled = 0; +#else +int dmar_disabled = 1; +#endif /*CONFIG_DMAR_DEFAULT_ON*/ + +static int dmar_map_gfx = 1; +static int dmar_forcedac; +static int intel_iommu_strict; +static int intel_iommu_superpage = 1; + +#define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1)) +static DEFINE_SPINLOCK(device_domain_lock); +static LIST_HEAD(device_domain_list); + +static struct iommu_ops intel_iommu_ops; + +static int __init intel_iommu_setup(char *str) +{ + if (!str) + return -EINVAL; + while (*str) { + if (!strncmp(str, "on", 2)) { + dmar_disabled = 0; + printk(KERN_INFO "Intel-IOMMU: enabled\n"); + } else if (!strncmp(str, "off", 3)) { + dmar_disabled = 1; + printk(KERN_INFO "Intel-IOMMU: disabled\n"); + } else if (!strncmp(str, "igfx_off", 8)) { + dmar_map_gfx = 0; + printk(KERN_INFO + "Intel-IOMMU: disable GFX device mapping\n"); + } else if (!strncmp(str, "forcedac", 8)) { + printk(KERN_INFO + "Intel-IOMMU: Forcing DAC for PCI devices\n"); + dmar_forcedac = 1; + } else if (!strncmp(str, "strict", 6)) { + printk(KERN_INFO + "Intel-IOMMU: disable batched IOTLB flush\n"); + intel_iommu_strict = 1; + } else if (!strncmp(str, "sp_off", 6)) { + printk(KERN_INFO + "Intel-IOMMU: disable supported super page\n"); + intel_iommu_superpage = 0; + } + + str += strcspn(str, ","); + while (*str == ',') + str++; + } + return 0; +} +__setup("intel_iommu=", intel_iommu_setup); + +static struct kmem_cache *iommu_domain_cache; +static struct kmem_cache *iommu_devinfo_cache; +static struct kmem_cache *iommu_iova_cache; + +static inline void *alloc_pgtable_page(int node) +{ + struct page *page; + void *vaddr = NULL; + + page = alloc_pages_node(node, GFP_ATOMIC | __GFP_ZERO, 0); + if (page) + vaddr = page_address(page); + return vaddr; +} + +static inline void free_pgtable_page(void *vaddr) +{ + free_page((unsigned long)vaddr); +} + +static inline void *alloc_domain_mem(void) +{ + return kmem_cache_alloc(iommu_domain_cache, GFP_ATOMIC); +} + +static void free_domain_mem(void *vaddr) +{ + kmem_cache_free(iommu_domain_cache, vaddr); +} + +static inline void * alloc_devinfo_mem(void) +{ + return kmem_cache_alloc(iommu_devinfo_cache, GFP_ATOMIC); +} + +static inline void free_devinfo_mem(void *vaddr) +{ + kmem_cache_free(iommu_devinfo_cache, vaddr); +} + +struct iova *alloc_iova_mem(void) +{ + return kmem_cache_alloc(iommu_iova_cache, GFP_ATOMIC); +} + +void free_iova_mem(struct iova *iova) +{ + kmem_cache_free(iommu_iova_cache, iova); +} + + +static int __iommu_calculate_agaw(struct intel_iommu *iommu, int max_gaw) +{ + unsigned long sagaw; + int agaw = -1; + + sagaw = cap_sagaw(iommu->cap); + for (agaw = width_to_agaw(max_gaw); + agaw >= 0; agaw--) { + if (test_bit(agaw, &sagaw)) + break; + } + + return agaw; +} + +/* + * Calculate max SAGAW for each iommu. + */ +int iommu_calculate_max_sagaw(struct intel_iommu *iommu) +{ + return __iommu_calculate_agaw(iommu, MAX_AGAW_WIDTH); +} + +/* + * calculate agaw for each iommu. + * "SAGAW" may be different across iommus, use a default agaw, and + * get a supported less agaw for iommus that don't support the default agaw. + */ +int iommu_calculate_agaw(struct intel_iommu *iommu) +{ + return __iommu_calculate_agaw(iommu, DEFAULT_DOMAIN_ADDRESS_WIDTH); +} + +/* This functionin only returns single iommu in a domain */ +static struct intel_iommu *domain_get_iommu(struct dmar_domain *domain) +{ + int iommu_id; + + /* si_domain and vm domain should not get here. */ + BUG_ON(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE); + BUG_ON(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY); + + iommu_id = find_first_bit(&domain->iommu_bmp, g_num_of_iommus); + if (iommu_id < 0 || iommu_id >= g_num_of_iommus) + return NULL; + + return g_iommus[iommu_id]; +} + +static void domain_update_iommu_coherency(struct dmar_domain *domain) +{ + int i; + + domain->iommu_coherency = 1; + + for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) { + if (!ecap_coherent(g_iommus[i]->ecap)) { + domain->iommu_coherency = 0; + break; + } + } +} + +static void domain_update_iommu_snooping(struct dmar_domain *domain) +{ + int i; + + domain->iommu_snooping = 1; + + for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) { + if (!ecap_sc_support(g_iommus[i]->ecap)) { + domain->iommu_snooping = 0; + break; + } + } +} + +static void domain_update_iommu_superpage(struct dmar_domain *domain) +{ + int i, mask = 0xf; + + if (!intel_iommu_superpage) { + domain->iommu_superpage = 0; + return; + } + + domain->iommu_superpage = 4; /* 1TiB */ + + for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) { + mask |= cap_super_page_val(g_iommus[i]->cap); + if (!mask) { + break; + } + } + domain->iommu_superpage = fls(mask); +} + +/* Some capabilities may be different across iommus */ +static void domain_update_iommu_cap(struct dmar_domain *domain) +{ + domain_update_iommu_coherency(domain); + domain_update_iommu_snooping(domain); + domain_update_iommu_superpage(domain); +} + +static struct intel_iommu *device_to_iommu(int segment, u8 bus, u8 devfn) +{ + struct dmar_drhd_unit *drhd = NULL; + int i; + + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + if (segment != drhd->segment) + continue; + + for (i = 0; i < drhd->devices_cnt; i++) { + if (drhd->devices[i] && + drhd->devices[i]->bus->number == bus && + drhd->devices[i]->devfn == devfn) + return drhd->iommu; + if (drhd->devices[i] && + drhd->devices[i]->subordinate && + drhd->devices[i]->subordinate->number <= bus && + drhd->devices[i]->subordinate->subordinate >= bus) + return drhd->iommu; + } + + if (drhd->include_all) + return drhd->iommu; + } + + return NULL; +} + +static void domain_flush_cache(struct dmar_domain *domain, + void *addr, int size) +{ + if (!domain->iommu_coherency) + clflush_cache_range(addr, size); +} + +/* Gets context entry for a given bus and devfn */ +static struct context_entry * device_to_context_entry(struct intel_iommu *iommu, + u8 bus, u8 devfn) +{ + struct root_entry *root; + struct context_entry *context; + unsigned long phy_addr; + unsigned long flags; + + spin_lock_irqsave(&iommu->lock, flags); + root = &iommu->root_entry[bus]; + context = get_context_addr_from_root(root); + if (!context) { + context = (struct context_entry *) + alloc_pgtable_page(iommu->node); + if (!context) { + spin_unlock_irqrestore(&iommu->lock, flags); + return NULL; + } + __iommu_flush_cache(iommu, (void *)context, CONTEXT_SIZE); + phy_addr = virt_to_phys((void *)context); + set_root_value(root, phy_addr); + set_root_present(root); + __iommu_flush_cache(iommu, root, sizeof(*root)); + } + spin_unlock_irqrestore(&iommu->lock, flags); + return &context[devfn]; +} + +static int device_context_mapped(struct intel_iommu *iommu, u8 bus, u8 devfn) +{ + struct root_entry *root; + struct context_entry *context; + int ret; + unsigned long flags; + + spin_lock_irqsave(&iommu->lock, flags); + root = &iommu->root_entry[bus]; + context = get_context_addr_from_root(root); + if (!context) { + ret = 0; + goto out; + } + ret = context_present(&context[devfn]); +out: + spin_unlock_irqrestore(&iommu->lock, flags); + return ret; +} + +static void clear_context_table(struct intel_iommu *iommu, u8 bus, u8 devfn) +{ + struct root_entry *root; + struct context_entry *context; + unsigned long flags; + + spin_lock_irqsave(&iommu->lock, flags); + root = &iommu->root_entry[bus]; + context = get_context_addr_from_root(root); + if (context) { + context_clear_entry(&context[devfn]); + __iommu_flush_cache(iommu, &context[devfn], \ + sizeof(*context)); + } + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static void free_context_table(struct intel_iommu *iommu) +{ + struct root_entry *root; + int i; + unsigned long flags; + struct context_entry *context; + + spin_lock_irqsave(&iommu->lock, flags); + if (!iommu->root_entry) { + goto out; + } + for (i = 0; i < ROOT_ENTRY_NR; i++) { + root = &iommu->root_entry[i]; + context = get_context_addr_from_root(root); + if (context) + free_pgtable_page(context); + } + free_pgtable_page(iommu->root_entry); + iommu->root_entry = NULL; +out: + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static struct dma_pte *pfn_to_dma_pte(struct dmar_domain *domain, + unsigned long pfn, int large_level) +{ + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + struct dma_pte *parent, *pte = NULL; + int level = agaw_to_level(domain->agaw); + int offset, target_level; + + BUG_ON(!domain->pgd); + BUG_ON(addr_width < BITS_PER_LONG && pfn >> addr_width); + parent = domain->pgd; + + /* Search pte */ + if (!large_level) + target_level = 1; + else + target_level = large_level; + + while (level > 0) { + void *tmp_page; + + offset = pfn_level_offset(pfn, level); + pte = &parent[offset]; + if (!large_level && (pte->val & DMA_PTE_LARGE_PAGE)) + break; + if (level == target_level) + break; + + if (!dma_pte_present(pte)) { + uint64_t pteval; + + tmp_page = alloc_pgtable_page(domain->nid); + + if (!tmp_page) + return NULL; + + domain_flush_cache(domain, tmp_page, VTD_PAGE_SIZE); + pteval = ((uint64_t)virt_to_dma_pfn(tmp_page) << VTD_PAGE_SHIFT) | DMA_PTE_READ | DMA_PTE_WRITE; + if (cmpxchg64(&pte->val, 0ULL, pteval)) { + /* Someone else set it while we were thinking; use theirs. */ + free_pgtable_page(tmp_page); + } else { + dma_pte_addr(pte); + domain_flush_cache(domain, pte, sizeof(*pte)); + } + } + parent = phys_to_virt(dma_pte_addr(pte)); + level--; + } + + return pte; +} + + +/* return address's pte at specific level */ +static struct dma_pte *dma_pfn_level_pte(struct dmar_domain *domain, + unsigned long pfn, + int level, int *large_page) +{ + struct dma_pte *parent, *pte = NULL; + int total = agaw_to_level(domain->agaw); + int offset; + + parent = domain->pgd; + while (level <= total) { + offset = pfn_level_offset(pfn, total); + pte = &parent[offset]; + if (level == total) + return pte; + + if (!dma_pte_present(pte)) { + *large_page = total; + break; + } + + if (pte->val & DMA_PTE_LARGE_PAGE) { + *large_page = total; + return pte; + } + + parent = phys_to_virt(dma_pte_addr(pte)); + total--; + } + return NULL; +} + +/* clear last level pte, a tlb flush should be followed */ +static void dma_pte_clear_range(struct dmar_domain *domain, + unsigned long start_pfn, + unsigned long last_pfn) +{ + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + unsigned int large_page = 1; + struct dma_pte *first_pte, *pte; + + BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); + BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(start_pfn > last_pfn); + + /* we don't need lock here; nobody else touches the iova range */ + do { + large_page = 1; + first_pte = pte = dma_pfn_level_pte(domain, start_pfn, 1, &large_page); + if (!pte) { + start_pfn = align_to_level(start_pfn + 1, large_page + 1); + continue; + } + do { + dma_clear_pte(pte); + start_pfn += lvl_to_nr_pages(large_page); + pte++; + } while (start_pfn <= last_pfn && !first_pte_in_page(pte)); + + domain_flush_cache(domain, first_pte, + (void *)pte - (void *)first_pte); + + } while (start_pfn && start_pfn <= last_pfn); +} + +/* free page table pages. last level pte should already be cleared */ +static void dma_pte_free_pagetable(struct dmar_domain *domain, + unsigned long start_pfn, + unsigned long last_pfn) +{ + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + struct dma_pte *first_pte, *pte; + int total = agaw_to_level(domain->agaw); + int level; + unsigned long tmp; + int large_page = 2; + + BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); + BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(start_pfn > last_pfn); + + /* We don't need lock here; nobody else touches the iova range */ + level = 2; + while (level <= total) { + tmp = align_to_level(start_pfn, level); + + /* If we can't even clear one PTE at this level, we're done */ + if (tmp + level_size(level) - 1 > last_pfn) + return; + + do { + large_page = level; + first_pte = pte = dma_pfn_level_pte(domain, tmp, level, &large_page); + if (large_page > level) + level = large_page + 1; + if (!pte) { + tmp = align_to_level(tmp + 1, level + 1); + continue; + } + do { + if (dma_pte_present(pte)) { + free_pgtable_page(phys_to_virt(dma_pte_addr(pte))); + dma_clear_pte(pte); + } + pte++; + tmp += level_size(level); + } while (!first_pte_in_page(pte) && + tmp + level_size(level) - 1 <= last_pfn); + + domain_flush_cache(domain, first_pte, + (void *)pte - (void *)first_pte); + + } while (tmp && tmp + level_size(level) - 1 <= last_pfn); + level++; + } + /* free pgd */ + if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) { + free_pgtable_page(domain->pgd); + domain->pgd = NULL; + } +} + +/* iommu handling */ +static int iommu_alloc_root_entry(struct intel_iommu *iommu) +{ + struct root_entry *root; + unsigned long flags; + + root = (struct root_entry *)alloc_pgtable_page(iommu->node); + if (!root) + return -ENOMEM; + + __iommu_flush_cache(iommu, root, ROOT_SIZE); + + spin_lock_irqsave(&iommu->lock, flags); + iommu->root_entry = root; + spin_unlock_irqrestore(&iommu->lock, flags); + + return 0; +} + +static void iommu_set_root_entry(struct intel_iommu *iommu) +{ + void *addr; + u32 sts; + unsigned long flag; + + addr = iommu->root_entry; + + spin_lock_irqsave(&iommu->register_lock, flag); + dmar_writeq(iommu->reg + DMAR_RTADDR_REG, virt_to_phys(addr)); + + writel(iommu->gcmd | DMA_GCMD_SRTP, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (sts & DMA_GSTS_RTPS), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +static void iommu_flush_write_buffer(struct intel_iommu *iommu) +{ + u32 val; + unsigned long flag; + + if (!rwbf_quirk && !cap_rwbf(iommu->cap)) + return; + + spin_lock_irqsave(&iommu->register_lock, flag); + writel(iommu->gcmd | DMA_GCMD_WBF, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (!(val & DMA_GSTS_WBFS)), val); + + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +/* return value determine if we need a write buffer flush */ +static void __iommu_flush_context(struct intel_iommu *iommu, + u16 did, u16 source_id, u8 function_mask, + u64 type) +{ + u64 val = 0; + unsigned long flag; + + switch (type) { + case DMA_CCMD_GLOBAL_INVL: + val = DMA_CCMD_GLOBAL_INVL; + break; + case DMA_CCMD_DOMAIN_INVL: + val = DMA_CCMD_DOMAIN_INVL|DMA_CCMD_DID(did); + break; + case DMA_CCMD_DEVICE_INVL: + val = DMA_CCMD_DEVICE_INVL|DMA_CCMD_DID(did) + | DMA_CCMD_SID(source_id) | DMA_CCMD_FM(function_mask); + break; + default: + BUG(); + } + val |= DMA_CCMD_ICC; + + spin_lock_irqsave(&iommu->register_lock, flag); + dmar_writeq(iommu->reg + DMAR_CCMD_REG, val); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_CCMD_REG, + dmar_readq, (!(val & DMA_CCMD_ICC)), val); + + spin_unlock_irqrestore(&iommu->register_lock, flag); +} + +/* return value determine if we need a write buffer flush */ +static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, + u64 addr, unsigned int size_order, u64 type) +{ + int tlb_offset = ecap_iotlb_offset(iommu->ecap); + u64 val = 0, val_iva = 0; + unsigned long flag; + + switch (type) { + case DMA_TLB_GLOBAL_FLUSH: + /* global flush doesn't need set IVA_REG */ + val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT; + break; + case DMA_TLB_DSI_FLUSH: + val = DMA_TLB_DSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); + break; + case DMA_TLB_PSI_FLUSH: + val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); + /* Note: always flush non-leaf currently */ + val_iva = size_order | addr; + break; + default: + BUG(); + } + /* Note: set drain read/write */ +#if 0 + /* + * This is probably to be super secure.. Looks like we can + * ignore it without any impact. + */ + if (cap_read_drain(iommu->cap)) + val |= DMA_TLB_READ_DRAIN; +#endif + if (cap_write_drain(iommu->cap)) + val |= DMA_TLB_WRITE_DRAIN; + + spin_lock_irqsave(&iommu->register_lock, flag); + /* Note: Only uses first TLB reg currently */ + if (val_iva) + dmar_writeq(iommu->reg + tlb_offset, val_iva); + dmar_writeq(iommu->reg + tlb_offset + 8, val); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, tlb_offset + 8, + dmar_readq, (!(val & DMA_TLB_IVT)), val); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + + /* check IOTLB invalidation granularity */ + if (DMA_TLB_IAIG(val) == 0) + printk(KERN_ERR"IOMMU: flush IOTLB failed\n"); + if (DMA_TLB_IAIG(val) != DMA_TLB_IIRG(type)) + pr_debug("IOMMU: tlb flush request %Lx, actual %Lx\n", + (unsigned long long)DMA_TLB_IIRG(type), + (unsigned long long)DMA_TLB_IAIG(val)); +} + +static struct device_domain_info *iommu_support_dev_iotlb( + struct dmar_domain *domain, int segment, u8 bus, u8 devfn) +{ + int found = 0; + unsigned long flags; + struct device_domain_info *info; + struct intel_iommu *iommu = device_to_iommu(segment, bus, devfn); + + if (!ecap_dev_iotlb_support(iommu->ecap)) + return NULL; + + if (!iommu->qi) + return NULL; + + spin_lock_irqsave(&device_domain_lock, flags); + list_for_each_entry(info, &domain->devices, link) + if (info->bus == bus && info->devfn == devfn) { + found = 1; + break; + } + spin_unlock_irqrestore(&device_domain_lock, flags); + + if (!found || !info->dev) + return NULL; + + if (!pci_find_ext_capability(info->dev, PCI_EXT_CAP_ID_ATS)) + return NULL; + + if (!dmar_find_matched_atsr_unit(info->dev)) + return NULL; + + info->iommu = iommu; + + return info; +} + +static void iommu_enable_dev_iotlb(struct device_domain_info *info) +{ + if (!info) + return; + + pci_enable_ats(info->dev, VTD_PAGE_SHIFT); +} + +static void iommu_disable_dev_iotlb(struct device_domain_info *info) +{ + if (!info->dev || !pci_ats_enabled(info->dev)) + return; + + pci_disable_ats(info->dev); +} + +static void iommu_flush_dev_iotlb(struct dmar_domain *domain, + u64 addr, unsigned mask) +{ + u16 sid, qdep; + unsigned long flags; + struct device_domain_info *info; + + spin_lock_irqsave(&device_domain_lock, flags); + list_for_each_entry(info, &domain->devices, link) { + if (!info->dev || !pci_ats_enabled(info->dev)) + continue; + + sid = info->bus << 8 | info->devfn; + qdep = pci_ats_queue_depth(info->dev); + qi_flush_dev_iotlb(info->iommu, sid, qdep, addr, mask); + } + spin_unlock_irqrestore(&device_domain_lock, flags); +} + +static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, + unsigned long pfn, unsigned int pages, int map) +{ + unsigned int mask = ilog2(__roundup_pow_of_two(pages)); + uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT; + + BUG_ON(pages == 0); + + /* + * Fallback to domain selective flush if no PSI support or the size is + * too big. + * PSI requires page size to be 2 ^ x, and the base address is naturally + * aligned to the size + */ + if (!cap_pgsel_inv(iommu->cap) || mask > cap_max_amask_val(iommu->cap)) + iommu->flush.flush_iotlb(iommu, did, 0, 0, + DMA_TLB_DSI_FLUSH); + else + iommu->flush.flush_iotlb(iommu, did, addr, mask, + DMA_TLB_PSI_FLUSH); + + /* + * In caching mode, changes of pages from non-present to present require + * flush. However, device IOTLB doesn't need to be flushed in this case. + */ + if (!cap_caching_mode(iommu->cap) || !map) + iommu_flush_dev_iotlb(iommu->domains[did], addr, mask); +} + +static void iommu_disable_protect_mem_regions(struct intel_iommu *iommu) +{ + u32 pmen; + unsigned long flags; + + spin_lock_irqsave(&iommu->register_lock, flags); + pmen = readl(iommu->reg + DMAR_PMEN_REG); + pmen &= ~DMA_PMEN_EPM; + writel(pmen, iommu->reg + DMAR_PMEN_REG); + + /* wait for the protected region status bit to clear */ + IOMMU_WAIT_OP(iommu, DMAR_PMEN_REG, + readl, !(pmen & DMA_PMEN_PRS), pmen); + + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +static int iommu_enable_translation(struct intel_iommu *iommu) +{ + u32 sts; + unsigned long flags; + + spin_lock_irqsave(&iommu->register_lock, flags); + iommu->gcmd |= DMA_GCMD_TE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (sts & DMA_GSTS_TES), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flags); + return 0; +} + +static int iommu_disable_translation(struct intel_iommu *iommu) +{ + u32 sts; + unsigned long flag; + + spin_lock_irqsave(&iommu->register_lock, flag); + iommu->gcmd &= ~DMA_GCMD_TE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + /* Make sure hardware complete it */ + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (!(sts & DMA_GSTS_TES)), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + return 0; +} + + +static int iommu_init_domains(struct intel_iommu *iommu) +{ + unsigned long ndomains; + unsigned long nlongs; + + ndomains = cap_ndoms(iommu->cap); + pr_debug("IOMMU %d: Number of Domains supportd <%ld>\n", iommu->seq_id, + ndomains); + nlongs = BITS_TO_LONGS(ndomains); + + spin_lock_init(&iommu->lock); + + /* TBD: there might be 64K domains, + * consider other allocation for future chip + */ + iommu->domain_ids = kcalloc(nlongs, sizeof(unsigned long), GFP_KERNEL); + if (!iommu->domain_ids) { + printk(KERN_ERR "Allocating domain id array failed\n"); + return -ENOMEM; + } + iommu->domains = kcalloc(ndomains, sizeof(struct dmar_domain *), + GFP_KERNEL); + if (!iommu->domains) { + printk(KERN_ERR "Allocating domain array failed\n"); + return -ENOMEM; + } + + /* + * if Caching mode is set, then invalid translations are tagged + * with domainid 0. Hence we need to pre-allocate it. + */ + if (cap_caching_mode(iommu->cap)) + set_bit(0, iommu->domain_ids); + return 0; +} + + +static void domain_exit(struct dmar_domain *domain); +static void vm_domain_exit(struct dmar_domain *domain); + +void free_dmar_iommu(struct intel_iommu *iommu) +{ + struct dmar_domain *domain; + int i; + unsigned long flags; + + if ((iommu->domains) && (iommu->domain_ids)) { + for_each_set_bit(i, iommu->domain_ids, cap_ndoms(iommu->cap)) { + domain = iommu->domains[i]; + clear_bit(i, iommu->domain_ids); + + spin_lock_irqsave(&domain->iommu_lock, flags); + if (--domain->iommu_count == 0) { + if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) + vm_domain_exit(domain); + else + domain_exit(domain); + } + spin_unlock_irqrestore(&domain->iommu_lock, flags); + } + } + + if (iommu->gcmd & DMA_GCMD_TE) + iommu_disable_translation(iommu); + + if (iommu->irq) { + irq_set_handler_data(iommu->irq, NULL); + /* This will mask the irq */ + free_irq(iommu->irq, iommu); + destroy_irq(iommu->irq); + } + + kfree(iommu->domains); + kfree(iommu->domain_ids); + + g_iommus[iommu->seq_id] = NULL; + + /* if all iommus are freed, free g_iommus */ + for (i = 0; i < g_num_of_iommus; i++) { + if (g_iommus[i]) + break; + } + + if (i == g_num_of_iommus) + kfree(g_iommus); + + /* free context mapping */ + free_context_table(iommu); +} + +static struct dmar_domain *alloc_domain(void) +{ + struct dmar_domain *domain; + + domain = alloc_domain_mem(); + if (!domain) + return NULL; + + domain->nid = -1; + memset(&domain->iommu_bmp, 0, sizeof(unsigned long)); + domain->flags = 0; + + return domain; +} + +static int iommu_attach_domain(struct dmar_domain *domain, + struct intel_iommu *iommu) +{ + int num; + unsigned long ndomains; + unsigned long flags; + + ndomains = cap_ndoms(iommu->cap); + + spin_lock_irqsave(&iommu->lock, flags); + + num = find_first_zero_bit(iommu->domain_ids, ndomains); + if (num >= ndomains) { + spin_unlock_irqrestore(&iommu->lock, flags); + printk(KERN_ERR "IOMMU: no free domain ids\n"); + return -ENOMEM; + } + + domain->id = num; + set_bit(num, iommu->domain_ids); + set_bit(iommu->seq_id, &domain->iommu_bmp); + iommu->domains[num] = domain; + spin_unlock_irqrestore(&iommu->lock, flags); + + return 0; +} + +static void iommu_detach_domain(struct dmar_domain *domain, + struct intel_iommu *iommu) +{ + unsigned long flags; + int num, ndomains; + int found = 0; + + spin_lock_irqsave(&iommu->lock, flags); + ndomains = cap_ndoms(iommu->cap); + for_each_set_bit(num, iommu->domain_ids, ndomains) { + if (iommu->domains[num] == domain) { + found = 1; + break; + } + } + + if (found) { + clear_bit(num, iommu->domain_ids); + clear_bit(iommu->seq_id, &domain->iommu_bmp); + iommu->domains[num] = NULL; + } + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static struct iova_domain reserved_iova_list; +static struct lock_class_key reserved_rbtree_key; + +static int dmar_init_reserved_ranges(void) +{ + struct pci_dev *pdev = NULL; + struct iova *iova; + int i; + + init_iova_domain(&reserved_iova_list, DMA_32BIT_PFN); + + lockdep_set_class(&reserved_iova_list.iova_rbtree_lock, + &reserved_rbtree_key); + + /* IOAPIC ranges shouldn't be accessed by DMA */ + iova = reserve_iova(&reserved_iova_list, IOVA_PFN(IOAPIC_RANGE_START), + IOVA_PFN(IOAPIC_RANGE_END)); + if (!iova) { + printk(KERN_ERR "Reserve IOAPIC range failed\n"); + return -ENODEV; + } + + /* Reserve all PCI MMIO to avoid peer-to-peer access */ + for_each_pci_dev(pdev) { + struct resource *r; + + for (i = 0; i < PCI_NUM_RESOURCES; i++) { + r = &pdev->resource[i]; + if (!r->flags || !(r->flags & IORESOURCE_MEM)) + continue; + iova = reserve_iova(&reserved_iova_list, + IOVA_PFN(r->start), + IOVA_PFN(r->end)); + if (!iova) { + printk(KERN_ERR "Reserve iova failed\n"); + return -ENODEV; + } + } + } + return 0; +} + +static void domain_reserve_special_ranges(struct dmar_domain *domain) +{ + copy_reserved_iova(&reserved_iova_list, &domain->iovad); +} + +static inline int guestwidth_to_adjustwidth(int gaw) +{ + int agaw; + int r = (gaw - 12) % 9; + + if (r == 0) + agaw = gaw; + else + agaw = gaw + 9 - r; + if (agaw > 64) + agaw = 64; + return agaw; +} + +static int domain_init(struct dmar_domain *domain, int guest_width) +{ + struct intel_iommu *iommu; + int adjust_width, agaw; + unsigned long sagaw; + + init_iova_domain(&domain->iovad, DMA_32BIT_PFN); + spin_lock_init(&domain->iommu_lock); + + domain_reserve_special_ranges(domain); + + /* calculate AGAW */ + iommu = domain_get_iommu(domain); + if (guest_width > cap_mgaw(iommu->cap)) + guest_width = cap_mgaw(iommu->cap); + domain->gaw = guest_width; + adjust_width = guestwidth_to_adjustwidth(guest_width); + agaw = width_to_agaw(adjust_width); + sagaw = cap_sagaw(iommu->cap); + if (!test_bit(agaw, &sagaw)) { + /* hardware doesn't support it, choose a bigger one */ + pr_debug("IOMMU: hardware doesn't support agaw %d\n", agaw); + agaw = find_next_bit(&sagaw, 5, agaw); + if (agaw >= 5) + return -ENODEV; + } + domain->agaw = agaw; + INIT_LIST_HEAD(&domain->devices); + + if (ecap_coherent(iommu->ecap)) + domain->iommu_coherency = 1; + else + domain->iommu_coherency = 0; + + if (ecap_sc_support(iommu->ecap)) + domain->iommu_snooping = 1; + else + domain->iommu_snooping = 0; + + domain->iommu_superpage = fls(cap_super_page_val(iommu->cap)); + domain->iommu_count = 1; + domain->nid = iommu->node; + + /* always allocate the top pgd */ + domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid); + if (!domain->pgd) + return -ENOMEM; + __iommu_flush_cache(iommu, domain->pgd, PAGE_SIZE); + return 0; +} + +static void domain_exit(struct dmar_domain *domain) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + + /* Domain 0 is reserved, so dont process it */ + if (!domain) + return; + + /* Flush any lazy unmaps that may reference this domain */ + if (!intel_iommu_strict) + flush_unmaps_timeout(0); + + domain_remove_dev_info(domain); + /* destroy iovas */ + put_iova_domain(&domain->iovad); + + /* clear ptes */ + dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); + + /* free page tables */ + dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); + + for_each_active_iommu(iommu, drhd) + if (test_bit(iommu->seq_id, &domain->iommu_bmp)) + iommu_detach_domain(domain, iommu); + + free_domain_mem(domain); +} + +static int domain_context_mapping_one(struct dmar_domain *domain, int segment, + u8 bus, u8 devfn, int translation) +{ + struct context_entry *context; + unsigned long flags; + struct intel_iommu *iommu; + struct dma_pte *pgd; + unsigned long num; + unsigned long ndomains; + int id; + int agaw; + struct device_domain_info *info = NULL; + + pr_debug("Set context mapping for %02x:%02x.%d\n", + bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); + + BUG_ON(!domain->pgd); + BUG_ON(translation != CONTEXT_TT_PASS_THROUGH && + translation != CONTEXT_TT_MULTI_LEVEL); + + iommu = device_to_iommu(segment, bus, devfn); + if (!iommu) + return -ENODEV; + + context = device_to_context_entry(iommu, bus, devfn); + if (!context) + return -ENOMEM; + spin_lock_irqsave(&iommu->lock, flags); + if (context_present(context)) { + spin_unlock_irqrestore(&iommu->lock, flags); + return 0; + } + + id = domain->id; + pgd = domain->pgd; + + if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE || + domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) { + int found = 0; + + /* find an available domain id for this device in iommu */ + ndomains = cap_ndoms(iommu->cap); + for_each_set_bit(num, iommu->domain_ids, ndomains) { + if (iommu->domains[num] == domain) { + id = num; + found = 1; + break; + } + } + + if (found == 0) { + num = find_first_zero_bit(iommu->domain_ids, ndomains); + if (num >= ndomains) { + spin_unlock_irqrestore(&iommu->lock, flags); + printk(KERN_ERR "IOMMU: no free domain ids\n"); + return -EFAULT; + } + + set_bit(num, iommu->domain_ids); + iommu->domains[num] = domain; + id = num; + } + + /* Skip top levels of page tables for + * iommu which has less agaw than default. + * Unnecessary for PT mode. + */ + if (translation != CONTEXT_TT_PASS_THROUGH) { + for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) { + pgd = phys_to_virt(dma_pte_addr(pgd)); + if (!dma_pte_present(pgd)) { + spin_unlock_irqrestore(&iommu->lock, flags); + return -ENOMEM; + } + } + } + } + + context_set_domain_id(context, id); + + if (translation != CONTEXT_TT_PASS_THROUGH) { + info = iommu_support_dev_iotlb(domain, segment, bus, devfn); + translation = info ? CONTEXT_TT_DEV_IOTLB : + CONTEXT_TT_MULTI_LEVEL; + } + /* + * In pass through mode, AW must be programmed to indicate the largest + * AGAW value supported by hardware. And ASR is ignored by hardware. + */ + if (unlikely(translation == CONTEXT_TT_PASS_THROUGH)) + context_set_address_width(context, iommu->msagaw); + else { + context_set_address_root(context, virt_to_phys(pgd)); + context_set_address_width(context, iommu->agaw); + } + + context_set_translation_type(context, translation); + context_set_fault_enable(context); + context_set_present(context); + domain_flush_cache(domain, context, sizeof(*context)); + + /* + * It's a non-present to present mapping. If hardware doesn't cache + * non-present entry we only need to flush the write-buffer. If the + * _does_ cache non-present entries, then it does so in the special + * domain #0, which we have to flush: + */ + if (cap_caching_mode(iommu->cap)) { + iommu->flush.flush_context(iommu, 0, + (((u16)bus) << 8) | devfn, + DMA_CCMD_MASK_NOBIT, + DMA_CCMD_DEVICE_INVL); + iommu->flush.flush_iotlb(iommu, domain->id, 0, 0, DMA_TLB_DSI_FLUSH); + } else { + iommu_flush_write_buffer(iommu); + } + iommu_enable_dev_iotlb(info); + spin_unlock_irqrestore(&iommu->lock, flags); + + spin_lock_irqsave(&domain->iommu_lock, flags); + if (!test_and_set_bit(iommu->seq_id, &domain->iommu_bmp)) { + domain->iommu_count++; + if (domain->iommu_count == 1) + domain->nid = iommu->node; + domain_update_iommu_cap(domain); + } + spin_unlock_irqrestore(&domain->iommu_lock, flags); + return 0; +} + +static int +domain_context_mapping(struct dmar_domain *domain, struct pci_dev *pdev, + int translation) +{ + int ret; + struct pci_dev *tmp, *parent; + + ret = domain_context_mapping_one(domain, pci_domain_nr(pdev->bus), + pdev->bus->number, pdev->devfn, + translation); + if (ret) + return ret; + + /* dependent device mapping */ + tmp = pci_find_upstream_pcie_bridge(pdev); + if (!tmp) + return 0; + /* Secondary interface's bus number and devfn 0 */ + parent = pdev->bus->self; + while (parent != tmp) { + ret = domain_context_mapping_one(domain, + pci_domain_nr(parent->bus), + parent->bus->number, + parent->devfn, translation); + if (ret) + return ret; + parent = parent->bus->self; + } + if (pci_is_pcie(tmp)) /* this is a PCIe-to-PCI bridge */ + return domain_context_mapping_one(domain, + pci_domain_nr(tmp->subordinate), + tmp->subordinate->number, 0, + translation); + else /* this is a legacy PCI bridge */ + return domain_context_mapping_one(domain, + pci_domain_nr(tmp->bus), + tmp->bus->number, + tmp->devfn, + translation); +} + +static int domain_context_mapped(struct pci_dev *pdev) +{ + int ret; + struct pci_dev *tmp, *parent; + struct intel_iommu *iommu; + + iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number, + pdev->devfn); + if (!iommu) + return -ENODEV; + + ret = device_context_mapped(iommu, pdev->bus->number, pdev->devfn); + if (!ret) + return ret; + /* dependent device mapping */ + tmp = pci_find_upstream_pcie_bridge(pdev); + if (!tmp) + return ret; + /* Secondary interface's bus number and devfn 0 */ + parent = pdev->bus->self; + while (parent != tmp) { + ret = device_context_mapped(iommu, parent->bus->number, + parent->devfn); + if (!ret) + return ret; + parent = parent->bus->self; + } + if (pci_is_pcie(tmp)) + return device_context_mapped(iommu, tmp->subordinate->number, + 0); + else + return device_context_mapped(iommu, tmp->bus->number, + tmp->devfn); +} + +/* Returns a number of VTD pages, but aligned to MM page size */ +static inline unsigned long aligned_nrpages(unsigned long host_addr, + size_t size) +{ + host_addr &= ~PAGE_MASK; + return PAGE_ALIGN(host_addr + size) >> VTD_PAGE_SHIFT; +} + +/* Return largest possible superpage level for a given mapping */ +static inline int hardware_largepage_caps(struct dmar_domain *domain, + unsigned long iov_pfn, + unsigned long phy_pfn, + unsigned long pages) +{ + int support, level = 1; + unsigned long pfnmerge; + + support = domain->iommu_superpage; + + /* To use a large page, the virtual *and* physical addresses + must be aligned to 2MiB/1GiB/etc. Lower bits set in either + of them will mean we have to use smaller pages. So just + merge them and check both at once. */ + pfnmerge = iov_pfn | phy_pfn; + + while (support && !(pfnmerge & ~VTD_STRIDE_MASK)) { + pages >>= VTD_STRIDE_SHIFT; + if (!pages) + break; + pfnmerge >>= VTD_STRIDE_SHIFT; + level++; + support--; + } + return level; +} + +static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn, + struct scatterlist *sg, unsigned long phys_pfn, + unsigned long nr_pages, int prot) +{ + struct dma_pte *first_pte = NULL, *pte = NULL; + phys_addr_t uninitialized_var(pteval); + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + unsigned long sg_res; + unsigned int largepage_lvl = 0; + unsigned long lvl_pages = 0; + + BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width); + + if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) + return -EINVAL; + + prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP; + + if (sg) + sg_res = 0; + else { + sg_res = nr_pages + 1; + pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot; + } + + while (nr_pages > 0) { + uint64_t tmp; + + if (!sg_res) { + sg_res = aligned_nrpages(sg->offset, sg->length); + sg->dma_address = ((dma_addr_t)iov_pfn << VTD_PAGE_SHIFT) + sg->offset; + sg->dma_length = sg->length; + pteval = page_to_phys(sg_page(sg)) | prot; + phys_pfn = pteval >> VTD_PAGE_SHIFT; + } + + if (!pte) { + largepage_lvl = hardware_largepage_caps(domain, iov_pfn, phys_pfn, sg_res); + + first_pte = pte = pfn_to_dma_pte(domain, iov_pfn, largepage_lvl); + if (!pte) + return -ENOMEM; + /* It is large page*/ + if (largepage_lvl > 1) + pteval |= DMA_PTE_LARGE_PAGE; + else + pteval &= ~(uint64_t)DMA_PTE_LARGE_PAGE; + + } + /* We don't need lock here, nobody else + * touches the iova range + */ + tmp = cmpxchg64_local(&pte->val, 0ULL, pteval); + if (tmp) { + static int dumps = 5; + printk(KERN_CRIT "ERROR: DMA PTE for vPFN 0x%lx already set (to %llx not %llx)\n", + iov_pfn, tmp, (unsigned long long)pteval); + if (dumps) { + dumps--; + debug_dma_dump_mappings(NULL); + } + WARN_ON(1); + } + + lvl_pages = lvl_to_nr_pages(largepage_lvl); + + BUG_ON(nr_pages < lvl_pages); + BUG_ON(sg_res < lvl_pages); + + nr_pages -= lvl_pages; + iov_pfn += lvl_pages; + phys_pfn += lvl_pages; + pteval += lvl_pages * VTD_PAGE_SIZE; + sg_res -= lvl_pages; + + /* If the next PTE would be the first in a new page, then we + need to flush the cache on the entries we've just written. + And then we'll need to recalculate 'pte', so clear it and + let it get set again in the if (!pte) block above. + + If we're done (!nr_pages) we need to flush the cache too. + + Also if we've been setting superpages, we may need to + recalculate 'pte' and switch back to smaller pages for the + end of the mapping, if the trailing size is not enough to + use another superpage (i.e. sg_res < lvl_pages). */ + pte++; + if (!nr_pages || first_pte_in_page(pte) || + (largepage_lvl > 1 && sg_res < lvl_pages)) { + domain_flush_cache(domain, first_pte, + (void *)pte - (void *)first_pte); + pte = NULL; + } + + if (!sg_res && nr_pages) + sg = sg_next(sg); + } + return 0; +} + +static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn, + struct scatterlist *sg, unsigned long nr_pages, + int prot) +{ + return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot); +} + +static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn, + unsigned long phys_pfn, unsigned long nr_pages, + int prot) +{ + return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot); +} + +static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn) +{ + if (!iommu) + return; + + clear_context_table(iommu, bus, devfn); + iommu->flush.flush_context(iommu, 0, 0, 0, + DMA_CCMD_GLOBAL_INVL); + iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH); +} + +static void domain_remove_dev_info(struct dmar_domain *domain) +{ + struct device_domain_info *info; + unsigned long flags; + struct intel_iommu *iommu; + + spin_lock_irqsave(&device_domain_lock, flags); + while (!list_empty(&domain->devices)) { + info = list_entry(domain->devices.next, + struct device_domain_info, link); + list_del(&info->link); + list_del(&info->global); + if (info->dev) + info->dev->dev.archdata.iommu = NULL; + spin_unlock_irqrestore(&device_domain_lock, flags); + + iommu_disable_dev_iotlb(info); + iommu = device_to_iommu(info->segment, info->bus, info->devfn); + iommu_detach_dev(iommu, info->bus, info->devfn); + free_devinfo_mem(info); + + spin_lock_irqsave(&device_domain_lock, flags); + } + spin_unlock_irqrestore(&device_domain_lock, flags); +} + +/* + * find_domain + * Note: we use struct pci_dev->dev.archdata.iommu stores the info + */ +static struct dmar_domain * +find_domain(struct pci_dev *pdev) +{ + struct device_domain_info *info; + + /* No lock here, assumes no domain exit in normal case */ + info = pdev->dev.archdata.iommu; + if (info) + return info->domain; + return NULL; +} + +/* domain is initialized */ +static struct dmar_domain *get_domain_for_dev(struct pci_dev *pdev, int gaw) +{ + struct dmar_domain *domain, *found = NULL; + struct intel_iommu *iommu; + struct dmar_drhd_unit *drhd; + struct device_domain_info *info, *tmp; + struct pci_dev *dev_tmp; + unsigned long flags; + int bus = 0, devfn = 0; + int segment; + int ret; + + domain = find_domain(pdev); + if (domain) + return domain; + + segment = pci_domain_nr(pdev->bus); + + dev_tmp = pci_find_upstream_pcie_bridge(pdev); + if (dev_tmp) { + if (pci_is_pcie(dev_tmp)) { + bus = dev_tmp->subordinate->number; + devfn = 0; + } else { + bus = dev_tmp->bus->number; + devfn = dev_tmp->devfn; + } + spin_lock_irqsave(&device_domain_lock, flags); + list_for_each_entry(info, &device_domain_list, global) { + if (info->segment == segment && + info->bus == bus && info->devfn == devfn) { + found = info->domain; + break; + } + } + spin_unlock_irqrestore(&device_domain_lock, flags); + /* pcie-pci bridge already has a domain, uses it */ + if (found) { + domain = found; + goto found_domain; + } + } + + domain = alloc_domain(); + if (!domain) + goto error; + + /* Allocate new domain for the device */ + drhd = dmar_find_matched_drhd_unit(pdev); + if (!drhd) { + printk(KERN_ERR "IOMMU: can't find DMAR for device %s\n", + pci_name(pdev)); + return NULL; + } + iommu = drhd->iommu; + + ret = iommu_attach_domain(domain, iommu); + if (ret) { + free_domain_mem(domain); + goto error; + } + + if (domain_init(domain, gaw)) { + domain_exit(domain); + goto error; + } + + /* register pcie-to-pci device */ + if (dev_tmp) { + info = alloc_devinfo_mem(); + if (!info) { + domain_exit(domain); + goto error; + } + info->segment = segment; + info->bus = bus; + info->devfn = devfn; + info->dev = NULL; + info->domain = domain; + /* This domain is shared by devices under p2p bridge */ + domain->flags |= DOMAIN_FLAG_P2P_MULTIPLE_DEVICES; + + /* pcie-to-pci bridge already has a domain, uses it */ + found = NULL; + spin_lock_irqsave(&device_domain_lock, flags); + list_for_each_entry(tmp, &device_domain_list, global) { + if (tmp->segment == segment && + tmp->bus == bus && tmp->devfn == devfn) { + found = tmp->domain; + break; + } + } + if (found) { + spin_unlock_irqrestore(&device_domain_lock, flags); + free_devinfo_mem(info); + domain_exit(domain); + domain = found; + } else { + list_add(&info->link, &domain->devices); + list_add(&info->global, &device_domain_list); + spin_unlock_irqrestore(&device_domain_lock, flags); + } + } + +found_domain: + info = alloc_devinfo_mem(); + if (!info) + goto error; + info->segment = segment; + info->bus = pdev->bus->number; + info->devfn = pdev->devfn; + info->dev = pdev; + info->domain = domain; + spin_lock_irqsave(&device_domain_lock, flags); + /* somebody is fast */ + found = find_domain(pdev); + if (found != NULL) { + spin_unlock_irqrestore(&device_domain_lock, flags); + if (found != domain) { + domain_exit(domain); + domain = found; + } + free_devinfo_mem(info); + return domain; + } + list_add(&info->link, &domain->devices); + list_add(&info->global, &device_domain_list); + pdev->dev.archdata.iommu = info; + spin_unlock_irqrestore(&device_domain_lock, flags); + return domain; +error: + /* recheck it here, maybe others set it */ + return find_domain(pdev); +} + +static int iommu_identity_mapping; +#define IDENTMAP_ALL 1 +#define IDENTMAP_GFX 2 +#define IDENTMAP_AZALIA 4 + +static int iommu_domain_identity_map(struct dmar_domain *domain, + unsigned long long start, + unsigned long long end) +{ + unsigned long first_vpfn = start >> VTD_PAGE_SHIFT; + unsigned long last_vpfn = end >> VTD_PAGE_SHIFT; + + if (!reserve_iova(&domain->iovad, dma_to_mm_pfn(first_vpfn), + dma_to_mm_pfn(last_vpfn))) { + printk(KERN_ERR "IOMMU: reserve iova failed\n"); + return -ENOMEM; + } + + pr_debug("Mapping reserved region %llx-%llx for domain %d\n", + start, end, domain->id); + /* + * RMRR range might have overlap with physical memory range, + * clear it first + */ + dma_pte_clear_range(domain, first_vpfn, last_vpfn); + + return domain_pfn_mapping(domain, first_vpfn, first_vpfn, + last_vpfn - first_vpfn + 1, + DMA_PTE_READ|DMA_PTE_WRITE); +} + +static int iommu_prepare_identity_map(struct pci_dev *pdev, + unsigned long long start, + unsigned long long end) +{ + struct dmar_domain *domain; + int ret; + + domain = get_domain_for_dev(pdev, DEFAULT_DOMAIN_ADDRESS_WIDTH); + if (!domain) + return -ENOMEM; + + /* For _hardware_ passthrough, don't bother. But for software + passthrough, we do it anyway -- it may indicate a memory + range which is reserved in E820, so which didn't get set + up to start with in si_domain */ + if (domain == si_domain && hw_pass_through) { + printk("Ignoring identity map for HW passthrough device %s [0x%Lx - 0x%Lx]\n", + pci_name(pdev), start, end); + return 0; + } + + printk(KERN_INFO + "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n", + pci_name(pdev), start, end); + + if (end < start) { + WARN(1, "Your BIOS is broken; RMRR ends before it starts!\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + ret = -EIO; + goto error; + } + + if (end >> agaw_to_width(domain->agaw)) { + WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + agaw_to_width(domain->agaw), + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + ret = -EIO; + goto error; + } + + ret = iommu_domain_identity_map(domain, start, end); + if (ret) + goto error; + + /* context entry init */ + ret = domain_context_mapping(domain, pdev, CONTEXT_TT_MULTI_LEVEL); + if (ret) + goto error; + + return 0; + + error: + domain_exit(domain); + return ret; +} + +static inline int iommu_prepare_rmrr_dev(struct dmar_rmrr_unit *rmrr, + struct pci_dev *pdev) +{ + if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO) + return 0; + return iommu_prepare_identity_map(pdev, rmrr->base_address, + rmrr->end_address); +} + +#ifdef CONFIG_DMAR_FLOPPY_WA +static inline void iommu_prepare_isa(void) +{ + struct pci_dev *pdev; + int ret; + + pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL); + if (!pdev) + return; + + printk(KERN_INFO "IOMMU: Prepare 0-16MiB unity mapping for LPC\n"); + ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024 - 1); + + if (ret) + printk(KERN_ERR "IOMMU: Failed to create 0-16MiB identity map; " + "floppy might not work\n"); + +} +#else +static inline void iommu_prepare_isa(void) +{ + return; +} +#endif /* !CONFIG_DMAR_FLPY_WA */ + +static int md_domain_init(struct dmar_domain *domain, int guest_width); + +static int __init si_domain_work_fn(unsigned long start_pfn, + unsigned long end_pfn, void *datax) +{ + int *ret = datax; + + *ret = iommu_domain_identity_map(si_domain, + (uint64_t)start_pfn << PAGE_SHIFT, + (uint64_t)end_pfn << PAGE_SHIFT); + return *ret; + +} + +static int __init si_domain_init(int hw) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + int nid, ret = 0; + + si_domain = alloc_domain(); + if (!si_domain) + return -EFAULT; + + pr_debug("Identity mapping domain is domain %d\n", si_domain->id); + + for_each_active_iommu(iommu, drhd) { + ret = iommu_attach_domain(si_domain, iommu); + if (ret) { + domain_exit(si_domain); + return -EFAULT; + } + } + + if (md_domain_init(si_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) { + domain_exit(si_domain); + return -EFAULT; + } + + si_domain->flags = DOMAIN_FLAG_STATIC_IDENTITY; + + if (hw) + return 0; + + for_each_online_node(nid) { + work_with_active_regions(nid, si_domain_work_fn, &ret); + if (ret) + return ret; + } + + return 0; +} + +static void domain_remove_one_dev_info(struct dmar_domain *domain, + struct pci_dev *pdev); +static int identity_mapping(struct pci_dev *pdev) +{ + struct device_domain_info *info; + + if (likely(!iommu_identity_mapping)) + return 0; + + info = pdev->dev.archdata.iommu; + if (info && info != DUMMY_DEVICE_DOMAIN_INFO) + return (info->domain == si_domain); + + return 0; +} + +static int domain_add_dev_info(struct dmar_domain *domain, + struct pci_dev *pdev, + int translation) +{ + struct device_domain_info *info; + unsigned long flags; + int ret; + + info = alloc_devinfo_mem(); + if (!info) + return -ENOMEM; + + ret = domain_context_mapping(domain, pdev, translation); + if (ret) { + free_devinfo_mem(info); + return ret; + } + + info->segment = pci_domain_nr(pdev->bus); + info->bus = pdev->bus->number; + info->devfn = pdev->devfn; + info->dev = pdev; + info->domain = domain; + + spin_lock_irqsave(&device_domain_lock, flags); + list_add(&info->link, &domain->devices); + list_add(&info->global, &device_domain_list); + pdev->dev.archdata.iommu = info; + spin_unlock_irqrestore(&device_domain_lock, flags); + + return 0; +} + +static int iommu_should_identity_map(struct pci_dev *pdev, int startup) +{ + if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev)) + return 1; + + if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev)) + return 1; + + if (!(iommu_identity_mapping & IDENTMAP_ALL)) + return 0; + + /* + * We want to start off with all devices in the 1:1 domain, and + * take them out later if we find they can't access all of memory. + * + * However, we can't do this for PCI devices behind bridges, + * because all PCI devices behind the same bridge will end up + * with the same source-id on their transactions. + * + * Practically speaking, we can't change things around for these + * devices at run-time, because we can't be sure there'll be no + * DMA transactions in flight for any of their siblings. + * + * So PCI devices (unless they're on the root bus) as well as + * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of + * the 1:1 domain, just in _case_ one of their siblings turns out + * not to be able to map all of memory. + */ + if (!pci_is_pcie(pdev)) { + if (!pci_is_root_bus(pdev->bus)) + return 0; + if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI) + return 0; + } else if (pdev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) + return 0; + + /* + * At boot time, we don't yet know if devices will be 64-bit capable. + * Assume that they will -- if they turn out not to be, then we can + * take them out of the 1:1 domain later. + */ + if (!startup) { + /* + * If the device's dma_mask is less than the system's memory + * size then this is not a candidate for identity mapping. + */ + u64 dma_mask = pdev->dma_mask; + + if (pdev->dev.coherent_dma_mask && + pdev->dev.coherent_dma_mask < dma_mask) + dma_mask = pdev->dev.coherent_dma_mask; + + return dma_mask >= dma_get_required_mask(&pdev->dev); + } + + return 1; +} + +static int __init iommu_prepare_static_identity_mapping(int hw) +{ + struct pci_dev *pdev = NULL; + int ret; + + ret = si_domain_init(hw); + if (ret) + return -EFAULT; + + for_each_pci_dev(pdev) { + /* Skip Host/PCI Bridge devices */ + if (IS_BRIDGE_HOST_DEVICE(pdev)) + continue; + if (iommu_should_identity_map(pdev, 1)) { + printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n", + hw ? "hardware" : "software", pci_name(pdev)); + + ret = domain_add_dev_info(si_domain, pdev, + hw ? CONTEXT_TT_PASS_THROUGH : + CONTEXT_TT_MULTI_LEVEL); + if (ret) + return ret; + } + } + + return 0; +} + +static int __init init_dmars(void) +{ + struct dmar_drhd_unit *drhd; + struct dmar_rmrr_unit *rmrr; + struct pci_dev *pdev; + struct intel_iommu *iommu; + int i, ret; + + /* + * for each drhd + * allocate root + * initialize and program root entry to not present + * endfor + */ + for_each_drhd_unit(drhd) { + g_num_of_iommus++; + /* + * lock not needed as this is only incremented in the single + * threaded kernel __init code path all other access are read + * only + */ + } + + g_iommus = kcalloc(g_num_of_iommus, sizeof(struct intel_iommu *), + GFP_KERNEL); + if (!g_iommus) { + printk(KERN_ERR "Allocating global iommu array failed\n"); + ret = -ENOMEM; + goto error; + } + + deferred_flush = kzalloc(g_num_of_iommus * + sizeof(struct deferred_flush_tables), GFP_KERNEL); + if (!deferred_flush) { + ret = -ENOMEM; + goto error; + } + + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + + iommu = drhd->iommu; + g_iommus[iommu->seq_id] = iommu; + + ret = iommu_init_domains(iommu); + if (ret) + goto error; + + /* + * TBD: + * we could share the same root & context tables + * among all IOMMU's. Need to Split it later. + */ + ret = iommu_alloc_root_entry(iommu); + if (ret) { + printk(KERN_ERR "IOMMU: allocate root entry failed\n"); + goto error; + } + if (!ecap_pass_through(iommu->ecap)) + hw_pass_through = 0; + } + + /* + * Start from the sane iommu hardware state. + */ + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + + iommu = drhd->iommu; + + /* + * If the queued invalidation is already initialized by us + * (for example, while enabling interrupt-remapping) then + * we got the things already rolling from a sane state. + */ + if (iommu->qi) + continue; + + /* + * Clear any previous faults. + */ + dmar_fault(-1, iommu); + /* + * Disable queued invalidation if supported and already enabled + * before OS handover. + */ + dmar_disable_qi(iommu); + } + + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + + iommu = drhd->iommu; + + if (dmar_enable_qi(iommu)) { + /* + * Queued Invalidate not enabled, use Register Based + * Invalidate + */ + iommu->flush.flush_context = __iommu_flush_context; + iommu->flush.flush_iotlb = __iommu_flush_iotlb; + printk(KERN_INFO "IOMMU %d 0x%Lx: using Register based " + "invalidation\n", + iommu->seq_id, + (unsigned long long)drhd->reg_base_addr); + } else { + iommu->flush.flush_context = qi_flush_context; + iommu->flush.flush_iotlb = qi_flush_iotlb; + printk(KERN_INFO "IOMMU %d 0x%Lx: using Queued " + "invalidation\n", + iommu->seq_id, + (unsigned long long)drhd->reg_base_addr); + } + } + + if (iommu_pass_through) + iommu_identity_mapping |= IDENTMAP_ALL; + +#ifdef CONFIG_DMAR_BROKEN_GFX_WA + iommu_identity_mapping |= IDENTMAP_GFX; +#endif + + check_tylersburg_isoch(); + + /* + * If pass through is not set or not enabled, setup context entries for + * identity mappings for rmrr, gfx, and isa and may fall back to static + * identity mapping if iommu_identity_mapping is set. + */ + if (iommu_identity_mapping) { + ret = iommu_prepare_static_identity_mapping(hw_pass_through); + if (ret) { + printk(KERN_CRIT "Failed to setup IOMMU pass-through\n"); + goto error; + } + } + /* + * For each rmrr + * for each dev attached to rmrr + * do + * locate drhd for dev, alloc domain for dev + * allocate free domain + * allocate page table entries for rmrr + * if context not allocated for bus + * allocate and init context + * set present in root table for this bus + * init context with domain, translation etc + * endfor + * endfor + */ + printk(KERN_INFO "IOMMU: Setting RMRR:\n"); + for_each_rmrr_units(rmrr) { + for (i = 0; i < rmrr->devices_cnt; i++) { + pdev = rmrr->devices[i]; + /* + * some BIOS lists non-exist devices in DMAR + * table. + */ + if (!pdev) + continue; + ret = iommu_prepare_rmrr_dev(rmrr, pdev); + if (ret) + printk(KERN_ERR + "IOMMU: mapping reserved region failed\n"); + } + } + + iommu_prepare_isa(); + + /* + * for each drhd + * enable fault log + * global invalidate context cache + * global invalidate iotlb + * enable translation + */ + for_each_drhd_unit(drhd) { + if (drhd->ignored) { + /* + * we always have to disable PMRs or DMA may fail on + * this device + */ + if (force_on) + iommu_disable_protect_mem_regions(drhd->iommu); + continue; + } + iommu = drhd->iommu; + + iommu_flush_write_buffer(iommu); + + ret = dmar_set_interrupt(iommu); + if (ret) + goto error; + + iommu_set_root_entry(iommu); + + iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL); + iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH); + + ret = iommu_enable_translation(iommu); + if (ret) + goto error; + + iommu_disable_protect_mem_regions(iommu); + } + + return 0; +error: + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + iommu = drhd->iommu; + free_iommu(iommu); + } + kfree(g_iommus); + return ret; +} + +/* This takes a number of _MM_ pages, not VTD pages */ +static struct iova *intel_alloc_iova(struct device *dev, + struct dmar_domain *domain, + unsigned long nrpages, uint64_t dma_mask) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct iova *iova = NULL; + + /* Restrict dma_mask to the width that the iommu can handle */ + dma_mask = min_t(uint64_t, DOMAIN_MAX_ADDR(domain->gaw), dma_mask); + + if (!dmar_forcedac && dma_mask > DMA_BIT_MASK(32)) { + /* + * First try to allocate an io virtual address in + * DMA_BIT_MASK(32) and if that fails then try allocating + * from higher range + */ + iova = alloc_iova(&domain->iovad, nrpages, + IOVA_PFN(DMA_BIT_MASK(32)), 1); + if (iova) + return iova; + } + iova = alloc_iova(&domain->iovad, nrpages, IOVA_PFN(dma_mask), 1); + if (unlikely(!iova)) { + printk(KERN_ERR "Allocating %ld-page iova for %s failed", + nrpages, pci_name(pdev)); + return NULL; + } + + return iova; +} + +static struct dmar_domain *__get_valid_domain_for_dev(struct pci_dev *pdev) +{ + struct dmar_domain *domain; + int ret; + + domain = get_domain_for_dev(pdev, + DEFAULT_DOMAIN_ADDRESS_WIDTH); + if (!domain) { + printk(KERN_ERR + "Allocating domain for %s failed", pci_name(pdev)); + return NULL; + } + + /* make sure context mapping is ok */ + if (unlikely(!domain_context_mapped(pdev))) { + ret = domain_context_mapping(domain, pdev, + CONTEXT_TT_MULTI_LEVEL); + if (ret) { + printk(KERN_ERR + "Domain context map for %s failed", + pci_name(pdev)); + return NULL; + } + } + + return domain; +} + +static inline struct dmar_domain *get_valid_domain_for_dev(struct pci_dev *dev) +{ + struct device_domain_info *info; + + /* No lock here, assumes no domain exit in normal case */ + info = dev->dev.archdata.iommu; + if (likely(info)) + return info->domain; + + return __get_valid_domain_for_dev(dev); +} + +static int iommu_dummy(struct pci_dev *pdev) +{ + return pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO; +} + +/* Check if the pdev needs to go through non-identity map and unmap process.*/ +static int iommu_no_mapping(struct device *dev) +{ + struct pci_dev *pdev; + int found; + + if (unlikely(dev->bus != &pci_bus_type)) + return 1; + + pdev = to_pci_dev(dev); + if (iommu_dummy(pdev)) + return 1; + + if (!iommu_identity_mapping) + return 0; + + found = identity_mapping(pdev); + if (found) { + if (iommu_should_identity_map(pdev, 0)) + return 1; + else { + /* + * 32 bit DMA is removed from si_domain and fall back + * to non-identity mapping. + */ + domain_remove_one_dev_info(si_domain, pdev); + printk(KERN_INFO "32bit %s uses non-identity mapping\n", + pci_name(pdev)); + return 0; + } + } else { + /* + * In case of a detached 64 bit DMA device from vm, the device + * is put into si_domain for identity mapping. + */ + if (iommu_should_identity_map(pdev, 0)) { + int ret; + ret = domain_add_dev_info(si_domain, pdev, + hw_pass_through ? + CONTEXT_TT_PASS_THROUGH : + CONTEXT_TT_MULTI_LEVEL); + if (!ret) { + printk(KERN_INFO "64bit %s uses identity mapping\n", + pci_name(pdev)); + return 1; + } + } + } + + return 0; +} + +static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr, + size_t size, int dir, u64 dma_mask) +{ + struct pci_dev *pdev = to_pci_dev(hwdev); + struct dmar_domain *domain; + phys_addr_t start_paddr; + struct iova *iova; + int prot = 0; + int ret; + struct intel_iommu *iommu; + unsigned long paddr_pfn = paddr >> PAGE_SHIFT; + + BUG_ON(dir == DMA_NONE); + + if (iommu_no_mapping(hwdev)) + return paddr; + + domain = get_valid_domain_for_dev(pdev); + if (!domain) + return 0; + + iommu = domain_get_iommu(domain); + size = aligned_nrpages(paddr, size); + + iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size), dma_mask); + if (!iova) + goto error; + + /* + * Check if DMAR supports zero-length reads on write only + * mappings.. + */ + if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \ + !cap_zlr(iommu->cap)) + prot |= DMA_PTE_READ; + if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) + prot |= DMA_PTE_WRITE; + /* + * paddr - (paddr + size) might be partial page, we should map the whole + * page. Note: if two part of one page are separately mapped, we + * might have two guest_addr mapping to the same host paddr, but this + * is not a big problem + */ + ret = domain_pfn_mapping(domain, mm_to_dma_pfn(iova->pfn_lo), + mm_to_dma_pfn(paddr_pfn), size, prot); + if (ret) + goto error; + + /* it's a non-present to present mapping. Only flush if caching mode */ + if (cap_caching_mode(iommu->cap)) + iommu_flush_iotlb_psi(iommu, domain->id, mm_to_dma_pfn(iova->pfn_lo), size, 1); + else + iommu_flush_write_buffer(iommu); + + start_paddr = (phys_addr_t)iova->pfn_lo << PAGE_SHIFT; + start_paddr += paddr & ~PAGE_MASK; + return start_paddr; + +error: + if (iova) + __free_iova(&domain->iovad, iova); + printk(KERN_ERR"Device %s request: %zx@%llx dir %d --- failed\n", + pci_name(pdev), size, (unsigned long long)paddr, dir); + return 0; +} + +static dma_addr_t intel_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return __intel_map_single(dev, page_to_phys(page) + offset, size, + dir, to_pci_dev(dev)->dma_mask); +} + +static void flush_unmaps(void) +{ + int i, j; + + timer_on = 0; + + /* just flush them all */ + for (i = 0; i < g_num_of_iommus; i++) { + struct intel_iommu *iommu = g_iommus[i]; + if (!iommu) + continue; + + if (!deferred_flush[i].next) + continue; + + /* In caching mode, global flushes turn emulation expensive */ + if (!cap_caching_mode(iommu->cap)) + iommu->flush.flush_iotlb(iommu, 0, 0, 0, + DMA_TLB_GLOBAL_FLUSH); + for (j = 0; j < deferred_flush[i].next; j++) { + unsigned long mask; + struct iova *iova = deferred_flush[i].iova[j]; + struct dmar_domain *domain = deferred_flush[i].domain[j]; + + /* On real hardware multiple invalidations are expensive */ + if (cap_caching_mode(iommu->cap)) + iommu_flush_iotlb_psi(iommu, domain->id, + iova->pfn_lo, iova->pfn_hi - iova->pfn_lo + 1, 0); + else { + mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1)); + iommu_flush_dev_iotlb(deferred_flush[i].domain[j], + (uint64_t)iova->pfn_lo << PAGE_SHIFT, mask); + } + __free_iova(&deferred_flush[i].domain[j]->iovad, iova); + } + deferred_flush[i].next = 0; + } + + list_size = 0; +} + +static void flush_unmaps_timeout(unsigned long data) +{ + unsigned long flags; + + spin_lock_irqsave(&async_umap_flush_lock, flags); + flush_unmaps(); + spin_unlock_irqrestore(&async_umap_flush_lock, flags); +} + +static void add_unmap(struct dmar_domain *dom, struct iova *iova) +{ + unsigned long flags; + int next, iommu_id; + struct intel_iommu *iommu; + + spin_lock_irqsave(&async_umap_flush_lock, flags); + if (list_size == HIGH_WATER_MARK) + flush_unmaps(); + + iommu = domain_get_iommu(dom); + iommu_id = iommu->seq_id; + + next = deferred_flush[iommu_id].next; + deferred_flush[iommu_id].domain[next] = dom; + deferred_flush[iommu_id].iova[next] = iova; + deferred_flush[iommu_id].next++; + + if (!timer_on) { + mod_timer(&unmap_timer, jiffies + msecs_to_jiffies(10)); + timer_on = 1; + } + list_size++; + spin_unlock_irqrestore(&async_umap_flush_lock, flags); +} + +static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct pci_dev *pdev = to_pci_dev(dev); + struct dmar_domain *domain; + unsigned long start_pfn, last_pfn; + struct iova *iova; + struct intel_iommu *iommu; + + if (iommu_no_mapping(dev)) + return; + + domain = find_domain(pdev); + BUG_ON(!domain); + + iommu = domain_get_iommu(domain); + + iova = find_iova(&domain->iovad, IOVA_PFN(dev_addr)); + if (WARN_ONCE(!iova, "Driver unmaps unmatched page at PFN %llx\n", + (unsigned long long)dev_addr)) + return; + + start_pfn = mm_to_dma_pfn(iova->pfn_lo); + last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1; + + pr_debug("Device %s unmapping: pfn %lx-%lx\n", + pci_name(pdev), start_pfn, last_pfn); + + /* clear the whole page */ + dma_pte_clear_range(domain, start_pfn, last_pfn); + + /* free page tables */ + dma_pte_free_pagetable(domain, start_pfn, last_pfn); + + if (intel_iommu_strict) { + iommu_flush_iotlb_psi(iommu, domain->id, start_pfn, + last_pfn - start_pfn + 1, 0); + /* free iova */ + __free_iova(&domain->iovad, iova); + } else { + add_unmap(domain, iova); + /* + * queue up the release of the unmap to save the 1/6th of the + * cpu used up by the iotlb flush operation... + */ + } +} + +static void *intel_alloc_coherent(struct device *hwdev, size_t size, + dma_addr_t *dma_handle, gfp_t flags) +{ + void *vaddr; + int order; + + size = PAGE_ALIGN(size); + order = get_order(size); + + if (!iommu_no_mapping(hwdev)) + flags &= ~(GFP_DMA | GFP_DMA32); + else if (hwdev->coherent_dma_mask < dma_get_required_mask(hwdev)) { + if (hwdev->coherent_dma_mask < DMA_BIT_MASK(32)) + flags |= GFP_DMA; + else + flags |= GFP_DMA32; + } + + vaddr = (void *)__get_free_pages(flags, order); + if (!vaddr) + return NULL; + memset(vaddr, 0, size); + + *dma_handle = __intel_map_single(hwdev, virt_to_bus(vaddr), size, + DMA_BIDIRECTIONAL, + hwdev->coherent_dma_mask); + if (*dma_handle) + return vaddr; + free_pages((unsigned long)vaddr, order); + return NULL; +} + +static void intel_free_coherent(struct device *hwdev, size_t size, void *vaddr, + dma_addr_t dma_handle) +{ + int order; + + size = PAGE_ALIGN(size); + order = get_order(size); + + intel_unmap_page(hwdev, dma_handle, size, DMA_BIDIRECTIONAL, NULL); + free_pages((unsigned long)vaddr, order); +} + +static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, + int nelems, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct pci_dev *pdev = to_pci_dev(hwdev); + struct dmar_domain *domain; + unsigned long start_pfn, last_pfn; + struct iova *iova; + struct intel_iommu *iommu; + + if (iommu_no_mapping(hwdev)) + return; + + domain = find_domain(pdev); + BUG_ON(!domain); + + iommu = domain_get_iommu(domain); + + iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address)); + if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n", + (unsigned long long)sglist[0].dma_address)) + return; + + start_pfn = mm_to_dma_pfn(iova->pfn_lo); + last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1; + + /* clear the whole page */ + dma_pte_clear_range(domain, start_pfn, last_pfn); + + /* free page tables */ + dma_pte_free_pagetable(domain, start_pfn, last_pfn); + + if (intel_iommu_strict) { + iommu_flush_iotlb_psi(iommu, domain->id, start_pfn, + last_pfn - start_pfn + 1, 0); + /* free iova */ + __free_iova(&domain->iovad, iova); + } else { + add_unmap(domain, iova); + /* + * queue up the release of the unmap to save the 1/6th of the + * cpu used up by the iotlb flush operation... + */ + } +} + +static int intel_nontranslate_map_sg(struct device *hddev, + struct scatterlist *sglist, int nelems, int dir) +{ + int i; + struct scatterlist *sg; + + for_each_sg(sglist, sg, nelems, i) { + BUG_ON(!sg_page(sg)); + sg->dma_address = page_to_phys(sg_page(sg)) + sg->offset; + sg->dma_length = sg->length; + } + return nelems; +} + +static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems, + enum dma_data_direction dir, struct dma_attrs *attrs) +{ + int i; + struct pci_dev *pdev = to_pci_dev(hwdev); + struct dmar_domain *domain; + size_t size = 0; + int prot = 0; + struct iova *iova = NULL; + int ret; + struct scatterlist *sg; + unsigned long start_vpfn; + struct intel_iommu *iommu; + + BUG_ON(dir == DMA_NONE); + if (iommu_no_mapping(hwdev)) + return intel_nontranslate_map_sg(hwdev, sglist, nelems, dir); + + domain = get_valid_domain_for_dev(pdev); + if (!domain) + return 0; + + iommu = domain_get_iommu(domain); + + for_each_sg(sglist, sg, nelems, i) + size += aligned_nrpages(sg->offset, sg->length); + + iova = intel_alloc_iova(hwdev, domain, dma_to_mm_pfn(size), + pdev->dma_mask); + if (!iova) { + sglist->dma_length = 0; + return 0; + } + + /* + * Check if DMAR supports zero-length reads on write only + * mappings.. + */ + if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL || \ + !cap_zlr(iommu->cap)) + prot |= DMA_PTE_READ; + if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) + prot |= DMA_PTE_WRITE; + + start_vpfn = mm_to_dma_pfn(iova->pfn_lo); + + ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot); + if (unlikely(ret)) { + /* clear the page */ + dma_pte_clear_range(domain, start_vpfn, + start_vpfn + size - 1); + /* free page tables */ + dma_pte_free_pagetable(domain, start_vpfn, + start_vpfn + size - 1); + /* free iova */ + __free_iova(&domain->iovad, iova); + return 0; + } + + /* it's a non-present to present mapping. Only flush if caching mode */ + if (cap_caching_mode(iommu->cap)) + iommu_flush_iotlb_psi(iommu, domain->id, start_vpfn, size, 1); + else + iommu_flush_write_buffer(iommu); + + return nelems; +} + +static int intel_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return !dma_addr; +} + +struct dma_map_ops intel_dma_ops = { + .alloc_coherent = intel_alloc_coherent, + .free_coherent = intel_free_coherent, + .map_sg = intel_map_sg, + .unmap_sg = intel_unmap_sg, + .map_page = intel_map_page, + .unmap_page = intel_unmap_page, + .mapping_error = intel_mapping_error, +}; + +static inline int iommu_domain_cache_init(void) +{ + int ret = 0; + + iommu_domain_cache = kmem_cache_create("iommu_domain", + sizeof(struct dmar_domain), + 0, + SLAB_HWCACHE_ALIGN, + + NULL); + if (!iommu_domain_cache) { + printk(KERN_ERR "Couldn't create iommu_domain cache\n"); + ret = -ENOMEM; + } + + return ret; +} + +static inline int iommu_devinfo_cache_init(void) +{ + int ret = 0; + + iommu_devinfo_cache = kmem_cache_create("iommu_devinfo", + sizeof(struct device_domain_info), + 0, + SLAB_HWCACHE_ALIGN, + NULL); + if (!iommu_devinfo_cache) { + printk(KERN_ERR "Couldn't create devinfo cache\n"); + ret = -ENOMEM; + } + + return ret; +} + +static inline int iommu_iova_cache_init(void) +{ + int ret = 0; + + iommu_iova_cache = kmem_cache_create("iommu_iova", + sizeof(struct iova), + 0, + SLAB_HWCACHE_ALIGN, + NULL); + if (!iommu_iova_cache) { + printk(KERN_ERR "Couldn't create iova cache\n"); + ret = -ENOMEM; + } + + return ret; +} + +static int __init iommu_init_mempool(void) +{ + int ret; + ret = iommu_iova_cache_init(); + if (ret) + return ret; + + ret = iommu_domain_cache_init(); + if (ret) + goto domain_error; + + ret = iommu_devinfo_cache_init(); + if (!ret) + return ret; + + kmem_cache_destroy(iommu_domain_cache); +domain_error: + kmem_cache_destroy(iommu_iova_cache); + + return -ENOMEM; +} + +static void __init iommu_exit_mempool(void) +{ + kmem_cache_destroy(iommu_devinfo_cache); + kmem_cache_destroy(iommu_domain_cache); + kmem_cache_destroy(iommu_iova_cache); + +} + +static void quirk_ioat_snb_local_iommu(struct pci_dev *pdev) +{ + struct dmar_drhd_unit *drhd; + u32 vtbar; + int rc; + + /* We know that this device on this chipset has its own IOMMU. + * If we find it under a different IOMMU, then the BIOS is lying + * to us. Hope that the IOMMU for this device is actually + * disabled, and it needs no translation... + */ + rc = pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(0, 0), 0xb0, &vtbar); + if (rc) { + /* "can't" happen */ + dev_info(&pdev->dev, "failed to run vt-d quirk\n"); + return; + } + vtbar &= 0xffff0000; + + /* we know that the this iommu should be at offset 0xa000 from vtbar */ + drhd = dmar_find_matched_drhd_unit(pdev); + if (WARN_TAINT_ONCE(!drhd || drhd->reg_base_addr - vtbar != 0xa000, + TAINT_FIRMWARE_WORKAROUND, + "BIOS assigned incorrect VT-d unit for Intel(R) QuickData Technology device\n")) + pdev->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO; +} +DECLARE_PCI_FIXUP_ENABLE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB, quirk_ioat_snb_local_iommu); + +static void __init init_no_remapping_devices(void) +{ + struct dmar_drhd_unit *drhd; + + for_each_drhd_unit(drhd) { + if (!drhd->include_all) { + int i; + for (i = 0; i < drhd->devices_cnt; i++) + if (drhd->devices[i] != NULL) + break; + /* ignore DMAR unit if no pci devices exist */ + if (i == drhd->devices_cnt) + drhd->ignored = 1; + } + } + + if (dmar_map_gfx) + return; + + for_each_drhd_unit(drhd) { + int i; + if (drhd->ignored || drhd->include_all) + continue; + + for (i = 0; i < drhd->devices_cnt; i++) + if (drhd->devices[i] && + !IS_GFX_DEVICE(drhd->devices[i])) + break; + + if (i < drhd->devices_cnt) + continue; + + /* bypass IOMMU if it is just for gfx devices */ + drhd->ignored = 1; + for (i = 0; i < drhd->devices_cnt; i++) { + if (!drhd->devices[i]) + continue; + drhd->devices[i]->dev.archdata.iommu = DUMMY_DEVICE_DOMAIN_INFO; + } + } +} + +#ifdef CONFIG_SUSPEND +static int init_iommu_hw(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + + for_each_active_iommu(iommu, drhd) + if (iommu->qi) + dmar_reenable_qi(iommu); + + for_each_iommu(iommu, drhd) { + if (drhd->ignored) { + /* + * we always have to disable PMRs or DMA may fail on + * this device + */ + if (force_on) + iommu_disable_protect_mem_regions(iommu); + continue; + } + + iommu_flush_write_buffer(iommu); + + iommu_set_root_entry(iommu); + + iommu->flush.flush_context(iommu, 0, 0, 0, + DMA_CCMD_GLOBAL_INVL); + iommu->flush.flush_iotlb(iommu, 0, 0, 0, + DMA_TLB_GLOBAL_FLUSH); + if (iommu_enable_translation(iommu)) + return 1; + iommu_disable_protect_mem_regions(iommu); + } + + return 0; +} + +static void iommu_flush_all(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + + for_each_active_iommu(iommu, drhd) { + iommu->flush.flush_context(iommu, 0, 0, 0, + DMA_CCMD_GLOBAL_INVL); + iommu->flush.flush_iotlb(iommu, 0, 0, 0, + DMA_TLB_GLOBAL_FLUSH); + } +} + +static int iommu_suspend(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + unsigned long flag; + + for_each_active_iommu(iommu, drhd) { + iommu->iommu_state = kzalloc(sizeof(u32) * MAX_SR_DMAR_REGS, + GFP_ATOMIC); + if (!iommu->iommu_state) + goto nomem; + } + + iommu_flush_all(); + + for_each_active_iommu(iommu, drhd) { + iommu_disable_translation(iommu); + + spin_lock_irqsave(&iommu->register_lock, flag); + + iommu->iommu_state[SR_DMAR_FECTL_REG] = + readl(iommu->reg + DMAR_FECTL_REG); + iommu->iommu_state[SR_DMAR_FEDATA_REG] = + readl(iommu->reg + DMAR_FEDATA_REG); + iommu->iommu_state[SR_DMAR_FEADDR_REG] = + readl(iommu->reg + DMAR_FEADDR_REG); + iommu->iommu_state[SR_DMAR_FEUADDR_REG] = + readl(iommu->reg + DMAR_FEUADDR_REG); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + } + return 0; + +nomem: + for_each_active_iommu(iommu, drhd) + kfree(iommu->iommu_state); + + return -ENOMEM; +} + +static void iommu_resume(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + unsigned long flag; + + if (init_iommu_hw()) { + if (force_on) + panic("tboot: IOMMU setup failed, DMAR can not resume!\n"); + else + WARN(1, "IOMMU setup failed, DMAR can not resume!\n"); + return; + } + + for_each_active_iommu(iommu, drhd) { + + spin_lock_irqsave(&iommu->register_lock, flag); + + writel(iommu->iommu_state[SR_DMAR_FECTL_REG], + iommu->reg + DMAR_FECTL_REG); + writel(iommu->iommu_state[SR_DMAR_FEDATA_REG], + iommu->reg + DMAR_FEDATA_REG); + writel(iommu->iommu_state[SR_DMAR_FEADDR_REG], + iommu->reg + DMAR_FEADDR_REG); + writel(iommu->iommu_state[SR_DMAR_FEUADDR_REG], + iommu->reg + DMAR_FEUADDR_REG); + + spin_unlock_irqrestore(&iommu->register_lock, flag); + } + + for_each_active_iommu(iommu, drhd) + kfree(iommu->iommu_state); +} + +static struct syscore_ops iommu_syscore_ops = { + .resume = iommu_resume, + .suspend = iommu_suspend, +}; + +static void __init init_iommu_pm_ops(void) +{ + register_syscore_ops(&iommu_syscore_ops); +} + +#else +static inline void init_iommu_pm_ops(void) {} +#endif /* CONFIG_PM */ + +/* + * Here we only respond to action of unbound device from driver. + * + * Added device is not attached to its DMAR domain here yet. That will happen + * when mapping the device to iova. + */ +static int device_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct pci_dev *pdev = to_pci_dev(dev); + struct dmar_domain *domain; + + if (iommu_no_mapping(dev)) + return 0; + + domain = find_domain(pdev); + if (!domain) + return 0; + + if (action == BUS_NOTIFY_UNBOUND_DRIVER && !iommu_pass_through) { + domain_remove_one_dev_info(domain, pdev); + + if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) && + !(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) && + list_empty(&domain->devices)) + domain_exit(domain); + } + + return 0; +} + +static struct notifier_block device_nb = { + .notifier_call = device_notifier, +}; + +int __init intel_iommu_init(void) +{ + int ret = 0; + + /* VT-d is required for a TXT/tboot launch, so enforce that */ + force_on = tboot_force_iommu(); + + if (dmar_table_init()) { + if (force_on) + panic("tboot: Failed to initialize DMAR table\n"); + return -ENODEV; + } + + if (dmar_dev_scope_init()) { + if (force_on) + panic("tboot: Failed to initialize DMAR device scope\n"); + return -ENODEV; + } + + /* + * Check the need for DMA-remapping initialization now. + * Above initialization will also be used by Interrupt-remapping. + */ + if (no_iommu || dmar_disabled) + return -ENODEV; + + if (iommu_init_mempool()) { + if (force_on) + panic("tboot: Failed to initialize iommu memory\n"); + return -ENODEV; + } + + if (dmar_init_reserved_ranges()) { + if (force_on) + panic("tboot: Failed to reserve iommu ranges\n"); + return -ENODEV; + } + + init_no_remapping_devices(); + + ret = init_dmars(); + if (ret) { + if (force_on) + panic("tboot: Failed to initialize DMARs\n"); + printk(KERN_ERR "IOMMU: dmar init failed\n"); + put_iova_domain(&reserved_iova_list); + iommu_exit_mempool(); + return ret; + } + printk(KERN_INFO + "PCI-DMA: Intel(R) Virtualization Technology for Directed I/O\n"); + + init_timer(&unmap_timer); +#ifdef CONFIG_SWIOTLB + swiotlb = 0; +#endif + dma_ops = &intel_dma_ops; + + init_iommu_pm_ops(); + + register_iommu(&intel_iommu_ops); + + bus_register_notifier(&pci_bus_type, &device_nb); + + return 0; +} + +static void iommu_detach_dependent_devices(struct intel_iommu *iommu, + struct pci_dev *pdev) +{ + struct pci_dev *tmp, *parent; + + if (!iommu || !pdev) + return; + + /* dependent device detach */ + tmp = pci_find_upstream_pcie_bridge(pdev); + /* Secondary interface's bus number and devfn 0 */ + if (tmp) { + parent = pdev->bus->self; + while (parent != tmp) { + iommu_detach_dev(iommu, parent->bus->number, + parent->devfn); + parent = parent->bus->self; + } + if (pci_is_pcie(tmp)) /* this is a PCIe-to-PCI bridge */ + iommu_detach_dev(iommu, + tmp->subordinate->number, 0); + else /* this is a legacy PCI bridge */ + iommu_detach_dev(iommu, tmp->bus->number, + tmp->devfn); + } +} + +static void domain_remove_one_dev_info(struct dmar_domain *domain, + struct pci_dev *pdev) +{ + struct device_domain_info *info; + struct intel_iommu *iommu; + unsigned long flags; + int found = 0; + struct list_head *entry, *tmp; + + iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number, + pdev->devfn); + if (!iommu) + return; + + spin_lock_irqsave(&device_domain_lock, flags); + list_for_each_safe(entry, tmp, &domain->devices) { + info = list_entry(entry, struct device_domain_info, link); + if (info->segment == pci_domain_nr(pdev->bus) && + info->bus == pdev->bus->number && + info->devfn == pdev->devfn) { + list_del(&info->link); + list_del(&info->global); + if (info->dev) + info->dev->dev.archdata.iommu = NULL; + spin_unlock_irqrestore(&device_domain_lock, flags); + + iommu_disable_dev_iotlb(info); + iommu_detach_dev(iommu, info->bus, info->devfn); + iommu_detach_dependent_devices(iommu, pdev); + free_devinfo_mem(info); + + spin_lock_irqsave(&device_domain_lock, flags); + + if (found) + break; + else + continue; + } + + /* if there is no other devices under the same iommu + * owned by this domain, clear this iommu in iommu_bmp + * update iommu count and coherency + */ + if (iommu == device_to_iommu(info->segment, info->bus, + info->devfn)) + found = 1; + } + + if (found == 0) { + unsigned long tmp_flags; + spin_lock_irqsave(&domain->iommu_lock, tmp_flags); + clear_bit(iommu->seq_id, &domain->iommu_bmp); + domain->iommu_count--; + domain_update_iommu_cap(domain); + spin_unlock_irqrestore(&domain->iommu_lock, tmp_flags); + + if (!(domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) && + !(domain->flags & DOMAIN_FLAG_STATIC_IDENTITY)) { + spin_lock_irqsave(&iommu->lock, tmp_flags); + clear_bit(domain->id, iommu->domain_ids); + iommu->domains[domain->id] = NULL; + spin_unlock_irqrestore(&iommu->lock, tmp_flags); + } + } + + spin_unlock_irqrestore(&device_domain_lock, flags); +} + +static void vm_domain_remove_all_dev_info(struct dmar_domain *domain) +{ + struct device_domain_info *info; + struct intel_iommu *iommu; + unsigned long flags1, flags2; + + spin_lock_irqsave(&device_domain_lock, flags1); + while (!list_empty(&domain->devices)) { + info = list_entry(domain->devices.next, + struct device_domain_info, link); + list_del(&info->link); + list_del(&info->global); + if (info->dev) + info->dev->dev.archdata.iommu = NULL; + + spin_unlock_irqrestore(&device_domain_lock, flags1); + + iommu_disable_dev_iotlb(info); + iommu = device_to_iommu(info->segment, info->bus, info->devfn); + iommu_detach_dev(iommu, info->bus, info->devfn); + iommu_detach_dependent_devices(iommu, info->dev); + + /* clear this iommu in iommu_bmp, update iommu count + * and capabilities + */ + spin_lock_irqsave(&domain->iommu_lock, flags2); + if (test_and_clear_bit(iommu->seq_id, + &domain->iommu_bmp)) { + domain->iommu_count--; + domain_update_iommu_cap(domain); + } + spin_unlock_irqrestore(&domain->iommu_lock, flags2); + + free_devinfo_mem(info); + spin_lock_irqsave(&device_domain_lock, flags1); + } + spin_unlock_irqrestore(&device_domain_lock, flags1); +} + +/* domain id for virtual machine, it won't be set in context */ +static unsigned long vm_domid; + +static struct dmar_domain *iommu_alloc_vm_domain(void) +{ + struct dmar_domain *domain; + + domain = alloc_domain_mem(); + if (!domain) + return NULL; + + domain->id = vm_domid++; + domain->nid = -1; + memset(&domain->iommu_bmp, 0, sizeof(unsigned long)); + domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE; + + return domain; +} + +static int md_domain_init(struct dmar_domain *domain, int guest_width) +{ + int adjust_width; + + init_iova_domain(&domain->iovad, DMA_32BIT_PFN); + spin_lock_init(&domain->iommu_lock); + + domain_reserve_special_ranges(domain); + + /* calculate AGAW */ + domain->gaw = guest_width; + adjust_width = guestwidth_to_adjustwidth(guest_width); + domain->agaw = width_to_agaw(adjust_width); + + INIT_LIST_HEAD(&domain->devices); + + domain->iommu_count = 0; + domain->iommu_coherency = 0; + domain->iommu_snooping = 0; + domain->iommu_superpage = 0; + domain->max_addr = 0; + domain->nid = -1; + + /* always allocate the top pgd */ + domain->pgd = (struct dma_pte *)alloc_pgtable_page(domain->nid); + if (!domain->pgd) + return -ENOMEM; + domain_flush_cache(domain, domain->pgd, PAGE_SIZE); + return 0; +} + +static void iommu_free_vm_domain(struct dmar_domain *domain) +{ + unsigned long flags; + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + unsigned long i; + unsigned long ndomains; + + for_each_drhd_unit(drhd) { + if (drhd->ignored) + continue; + iommu = drhd->iommu; + + ndomains = cap_ndoms(iommu->cap); + for_each_set_bit(i, iommu->domain_ids, ndomains) { + if (iommu->domains[i] == domain) { + spin_lock_irqsave(&iommu->lock, flags); + clear_bit(i, iommu->domain_ids); + iommu->domains[i] = NULL; + spin_unlock_irqrestore(&iommu->lock, flags); + break; + } + } + } +} + +static void vm_domain_exit(struct dmar_domain *domain) +{ + /* Domain 0 is reserved, so dont process it */ + if (!domain) + return; + + vm_domain_remove_all_dev_info(domain); + /* destroy iovas */ + put_iova_domain(&domain->iovad); + + /* clear ptes */ + dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); + + /* free page tables */ + dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); + + iommu_free_vm_domain(domain); + free_domain_mem(domain); +} + +static int intel_iommu_domain_init(struct iommu_domain *domain) +{ + struct dmar_domain *dmar_domain; + + dmar_domain = iommu_alloc_vm_domain(); + if (!dmar_domain) { + printk(KERN_ERR + "intel_iommu_domain_init: dmar_domain == NULL\n"); + return -ENOMEM; + } + if (md_domain_init(dmar_domain, DEFAULT_DOMAIN_ADDRESS_WIDTH)) { + printk(KERN_ERR + "intel_iommu_domain_init() failed\n"); + vm_domain_exit(dmar_domain); + return -ENOMEM; + } + domain->priv = dmar_domain; + + return 0; +} + +static void intel_iommu_domain_destroy(struct iommu_domain *domain) +{ + struct dmar_domain *dmar_domain = domain->priv; + + domain->priv = NULL; + vm_domain_exit(dmar_domain); +} + +static int intel_iommu_attach_device(struct iommu_domain *domain, + struct device *dev) +{ + struct dmar_domain *dmar_domain = domain->priv; + struct pci_dev *pdev = to_pci_dev(dev); + struct intel_iommu *iommu; + int addr_width; + + /* normally pdev is not mapped */ + if (unlikely(domain_context_mapped(pdev))) { + struct dmar_domain *old_domain; + + old_domain = find_domain(pdev); + if (old_domain) { + if (dmar_domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE || + dmar_domain->flags & DOMAIN_FLAG_STATIC_IDENTITY) + domain_remove_one_dev_info(old_domain, pdev); + else + domain_remove_dev_info(old_domain); + } + } + + iommu = device_to_iommu(pci_domain_nr(pdev->bus), pdev->bus->number, + pdev->devfn); + if (!iommu) + return -ENODEV; + + /* check if this iommu agaw is sufficient for max mapped address */ + addr_width = agaw_to_width(iommu->agaw); + if (addr_width > cap_mgaw(iommu->cap)) + addr_width = cap_mgaw(iommu->cap); + + if (dmar_domain->max_addr > (1LL << addr_width)) { + printk(KERN_ERR "%s: iommu width (%d) is not " + "sufficient for the mapped address (%llx)\n", + __func__, addr_width, dmar_domain->max_addr); + return -EFAULT; + } + dmar_domain->gaw = addr_width; + + /* + * Knock out extra levels of page tables if necessary + */ + while (iommu->agaw < dmar_domain->agaw) { + struct dma_pte *pte; + + pte = dmar_domain->pgd; + if (dma_pte_present(pte)) { + dmar_domain->pgd = (struct dma_pte *) + phys_to_virt(dma_pte_addr(pte)); + free_pgtable_page(pte); + } + dmar_domain->agaw--; + } + + return domain_add_dev_info(dmar_domain, pdev, CONTEXT_TT_MULTI_LEVEL); +} + +static void intel_iommu_detach_device(struct iommu_domain *domain, + struct device *dev) +{ + struct dmar_domain *dmar_domain = domain->priv; + struct pci_dev *pdev = to_pci_dev(dev); + + domain_remove_one_dev_info(dmar_domain, pdev); +} + +static int intel_iommu_map(struct iommu_domain *domain, + unsigned long iova, phys_addr_t hpa, + int gfp_order, int iommu_prot) +{ + struct dmar_domain *dmar_domain = domain->priv; + u64 max_addr; + int prot = 0; + size_t size; + int ret; + + if (iommu_prot & IOMMU_READ) + prot |= DMA_PTE_READ; + if (iommu_prot & IOMMU_WRITE) + prot |= DMA_PTE_WRITE; + if ((iommu_prot & IOMMU_CACHE) && dmar_domain->iommu_snooping) + prot |= DMA_PTE_SNP; + + size = PAGE_SIZE << gfp_order; + max_addr = iova + size; + if (dmar_domain->max_addr < max_addr) { + u64 end; + + /* check if minimum agaw is sufficient for mapped address */ + end = __DOMAIN_MAX_ADDR(dmar_domain->gaw) + 1; + if (end < max_addr) { + printk(KERN_ERR "%s: iommu width (%d) is not " + "sufficient for the mapped address (%llx)\n", + __func__, dmar_domain->gaw, max_addr); + return -EFAULT; + } + dmar_domain->max_addr = max_addr; + } + /* Round up size to next multiple of PAGE_SIZE, if it and + the low bits of hpa would take us onto the next page */ + size = aligned_nrpages(hpa, size); + ret = domain_pfn_mapping(dmar_domain, iova >> VTD_PAGE_SHIFT, + hpa >> VTD_PAGE_SHIFT, size, prot); + return ret; +} + +static int intel_iommu_unmap(struct iommu_domain *domain, + unsigned long iova, int gfp_order) +{ + struct dmar_domain *dmar_domain = domain->priv; + size_t size = PAGE_SIZE << gfp_order; + + dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, + (iova + size - 1) >> VTD_PAGE_SHIFT); + + if (dmar_domain->max_addr == iova + size) + dmar_domain->max_addr = iova; + + return gfp_order; +} + +static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain, + unsigned long iova) +{ + struct dmar_domain *dmar_domain = domain->priv; + struct dma_pte *pte; + u64 phys = 0; + + pte = pfn_to_dma_pte(dmar_domain, iova >> VTD_PAGE_SHIFT, 0); + if (pte) + phys = dma_pte_addr(pte); + + return phys; +} + +static int intel_iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + struct dmar_domain *dmar_domain = domain->priv; + + if (cap == IOMMU_CAP_CACHE_COHERENCY) + return dmar_domain->iommu_snooping; + if (cap == IOMMU_CAP_INTR_REMAP) + return intr_remapping_enabled; + + return 0; +} + +static struct iommu_ops intel_iommu_ops = { + .domain_init = intel_iommu_domain_init, + .domain_destroy = intel_iommu_domain_destroy, + .attach_dev = intel_iommu_attach_device, + .detach_dev = intel_iommu_detach_device, + .map = intel_iommu_map, + .unmap = intel_iommu_unmap, + .iova_to_phys = intel_iommu_iova_to_phys, + .domain_has_cap = intel_iommu_domain_has_cap, +}; + +static void __devinit quirk_iommu_rwbf(struct pci_dev *dev) +{ + /* + * Mobile 4 Series Chipset neglects to set RWBF capability, + * but needs it: + */ + printk(KERN_INFO "DMAR: Forcing write-buffer flush capability\n"); + rwbf_quirk = 1; + + /* https://bugzilla.redhat.com/show_bug.cgi?id=538163 */ + if (dev->revision == 0x07) { + printk(KERN_INFO "DMAR: Disabling IOMMU for graphics on this chipset\n"); + dmar_map_gfx = 0; + } +} + +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_rwbf); + +#define GGC 0x52 +#define GGC_MEMORY_SIZE_MASK (0xf << 8) +#define GGC_MEMORY_SIZE_NONE (0x0 << 8) +#define GGC_MEMORY_SIZE_1M (0x1 << 8) +#define GGC_MEMORY_SIZE_2M (0x3 << 8) +#define GGC_MEMORY_VT_ENABLED (0x8 << 8) +#define GGC_MEMORY_SIZE_2M_VT (0x9 << 8) +#define GGC_MEMORY_SIZE_3M_VT (0xa << 8) +#define GGC_MEMORY_SIZE_4M_VT (0xb << 8) + +static void __devinit quirk_calpella_no_shadow_gtt(struct pci_dev *dev) +{ + unsigned short ggc; + + if (pci_read_config_word(dev, GGC, &ggc)) + return; + + if (!(ggc & GGC_MEMORY_VT_ENABLED)) { + printk(KERN_INFO "DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics\n"); + dmar_map_gfx = 0; + } +} +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0040, quirk_calpella_no_shadow_gtt); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0044, quirk_calpella_no_shadow_gtt); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x0062, quirk_calpella_no_shadow_gtt); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x006a, quirk_calpella_no_shadow_gtt); + +/* On Tylersburg chipsets, some BIOSes have been known to enable the + ISOCH DMAR unit for the Azalia sound device, but not give it any + TLB entries, which causes it to deadlock. Check for that. We do + this in a function called from init_dmars(), instead of in a PCI + quirk, because we don't want to print the obnoxious "BIOS broken" + message if VT-d is actually disabled. +*/ +static void __init check_tylersburg_isoch(void) +{ + struct pci_dev *pdev; + uint32_t vtisochctrl; + + /* If there's no Azalia in the system anyway, forget it. */ + pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x3a3e, NULL); + if (!pdev) + return; + pci_dev_put(pdev); + + /* System Management Registers. Might be hidden, in which case + we can't do the sanity check. But that's OK, because the + known-broken BIOSes _don't_ actually hide it, so far. */ + pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x342e, NULL); + if (!pdev) + return; + + if (pci_read_config_dword(pdev, 0x188, &vtisochctrl)) { + pci_dev_put(pdev); + return; + } + + pci_dev_put(pdev); + + /* If Azalia DMA is routed to the non-isoch DMAR unit, fine. */ + if (vtisochctrl & 1) + return; + + /* Drop all bits other than the number of TLB entries */ + vtisochctrl &= 0x1c; + + /* If we have the recommended number of TLB entries (16), fine. */ + if (vtisochctrl == 0x10) + return; + + /* Zero TLB entries? You get to ride the short bus to school. */ + if (!vtisochctrl) { + WARN(1, "Your BIOS is broken; DMA routed to ISOCH DMAR unit but no TLB space.\n" + "BIOS vendor: %s; Ver: %s; Product Version: %s\n", + dmi_get_system_info(DMI_BIOS_VENDOR), + dmi_get_system_info(DMI_BIOS_VERSION), + dmi_get_system_info(DMI_PRODUCT_VERSION)); + iommu_identity_mapping |= IDENTMAP_AZALIA; + return; + } + + printk(KERN_WARNING "DMAR: Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n", + vtisochctrl); +} diff --git a/drivers/iommu/intr_remapping.c b/drivers/iommu/intr_remapping.c new file mode 100644 index 00000000000..1a89d4a2cad --- /dev/null +++ b/drivers/iommu/intr_remapping.c @@ -0,0 +1,797 @@ +#include <linux/interrupt.h> +#include <linux/dmar.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/hpet.h> +#include <linux/pci.h> +#include <linux/irq.h> +#include <asm/io_apic.h> +#include <asm/smp.h> +#include <asm/cpu.h> +#include <linux/intel-iommu.h> +#include "intr_remapping.h" +#include <acpi/acpi.h> +#include <asm/pci-direct.h> + +static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; +static struct hpet_scope ir_hpet[MAX_HPET_TBS]; +static int ir_ioapic_num, ir_hpet_num; +int intr_remapping_enabled; + +static int disable_intremap; +static int disable_sourceid_checking; + +static __init int setup_nointremap(char *str) +{ + disable_intremap = 1; + return 0; +} +early_param("nointremap", setup_nointremap); + +static __init int setup_intremap(char *str) +{ + if (!str) + return -EINVAL; + + if (!strncmp(str, "on", 2)) + disable_intremap = 0; + else if (!strncmp(str, "off", 3)) + disable_intremap = 1; + else if (!strncmp(str, "nosid", 5)) + disable_sourceid_checking = 1; + + return 0; +} +early_param("intremap", setup_intremap); + +static DEFINE_SPINLOCK(irq_2_ir_lock); + +static struct irq_2_iommu *irq_2_iommu(unsigned int irq) +{ + struct irq_cfg *cfg = irq_get_chip_data(irq); + return cfg ? &cfg->irq_2_iommu : NULL; +} + +int get_irte(int irq, struct irte *entry) +{ + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + unsigned long flags; + int index; + + if (!entry || !irq_iommu) + return -1; + + spin_lock_irqsave(&irq_2_ir_lock, flags); + + index = irq_iommu->irte_index + irq_iommu->sub_handle; + *entry = *(irq_iommu->iommu->ir_table->base + index); + + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + return 0; +} + +int alloc_irte(struct intel_iommu *iommu, int irq, u16 count) +{ + struct ir_table *table = iommu->ir_table; + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + u16 index, start_index; + unsigned int mask = 0; + unsigned long flags; + int i; + + if (!count || !irq_iommu) + return -1; + + /* + * start the IRTE search from index 0. + */ + index = start_index = 0; + + if (count > 1) { + count = __roundup_pow_of_two(count); + mask = ilog2(count); + } + + if (mask > ecap_max_handle_mask(iommu->ecap)) { + printk(KERN_ERR + "Requested mask %x exceeds the max invalidation handle" + " mask value %Lx\n", mask, + ecap_max_handle_mask(iommu->ecap)); + return -1; + } + + spin_lock_irqsave(&irq_2_ir_lock, flags); + do { + for (i = index; i < index + count; i++) + if (table->base[i].present) + break; + /* empty index found */ + if (i == index + count) + break; + + index = (index + count) % INTR_REMAP_TABLE_ENTRIES; + + if (index == start_index) { + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + printk(KERN_ERR "can't allocate an IRTE\n"); + return -1; + } + } while (1); + + for (i = index; i < index + count; i++) + table->base[i].present = 1; + + irq_iommu->iommu = iommu; + irq_iommu->irte_index = index; + irq_iommu->sub_handle = 0; + irq_iommu->irte_mask = mask; + + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + + return index; +} + +static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask) +{ + struct qi_desc desc; + + desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask) + | QI_IEC_SELECTIVE; + desc.high = 0; + + return qi_submit_sync(&desc, iommu); +} + +int map_irq_to_irte_handle(int irq, u16 *sub_handle) +{ + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + unsigned long flags; + int index; + + if (!irq_iommu) + return -1; + + spin_lock_irqsave(&irq_2_ir_lock, flags); + *sub_handle = irq_iommu->sub_handle; + index = irq_iommu->irte_index; + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + return index; +} + +int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle) +{ + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + unsigned long flags; + + if (!irq_iommu) + return -1; + + spin_lock_irqsave(&irq_2_ir_lock, flags); + + irq_iommu->iommu = iommu; + irq_iommu->irte_index = index; + irq_iommu->sub_handle = subhandle; + irq_iommu->irte_mask = 0; + + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + + return 0; +} + +int modify_irte(int irq, struct irte *irte_modified) +{ + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + struct intel_iommu *iommu; + unsigned long flags; + struct irte *irte; + int rc, index; + + if (!irq_iommu) + return -1; + + spin_lock_irqsave(&irq_2_ir_lock, flags); + + iommu = irq_iommu->iommu; + + index = irq_iommu->irte_index + irq_iommu->sub_handle; + irte = &iommu->ir_table->base[index]; + + set_64bit(&irte->low, irte_modified->low); + set_64bit(&irte->high, irte_modified->high); + __iommu_flush_cache(iommu, irte, sizeof(*irte)); + + rc = qi_flush_iec(iommu, index, 0); + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + + return rc; +} + +struct intel_iommu *map_hpet_to_ir(u8 hpet_id) +{ + int i; + + for (i = 0; i < MAX_HPET_TBS; i++) + if (ir_hpet[i].id == hpet_id) + return ir_hpet[i].iommu; + return NULL; +} + +struct intel_iommu *map_ioapic_to_ir(int apic) +{ + int i; + + for (i = 0; i < MAX_IO_APICS; i++) + if (ir_ioapic[i].id == apic) + return ir_ioapic[i].iommu; + return NULL; +} + +struct intel_iommu *map_dev_to_ir(struct pci_dev *dev) +{ + struct dmar_drhd_unit *drhd; + + drhd = dmar_find_matched_drhd_unit(dev); + if (!drhd) + return NULL; + + return drhd->iommu; +} + +static int clear_entries(struct irq_2_iommu *irq_iommu) +{ + struct irte *start, *entry, *end; + struct intel_iommu *iommu; + int index; + + if (irq_iommu->sub_handle) + return 0; + + iommu = irq_iommu->iommu; + index = irq_iommu->irte_index + irq_iommu->sub_handle; + + start = iommu->ir_table->base + index; + end = start + (1 << irq_iommu->irte_mask); + + for (entry = start; entry < end; entry++) { + set_64bit(&entry->low, 0); + set_64bit(&entry->high, 0); + } + + return qi_flush_iec(iommu, index, irq_iommu->irte_mask); +} + +int free_irte(int irq) +{ + struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); + unsigned long flags; + int rc; + + if (!irq_iommu) + return -1; + + spin_lock_irqsave(&irq_2_ir_lock, flags); + + rc = clear_entries(irq_iommu); + + irq_iommu->iommu = NULL; + irq_iommu->irte_index = 0; + irq_iommu->sub_handle = 0; + irq_iommu->irte_mask = 0; + + spin_unlock_irqrestore(&irq_2_ir_lock, flags); + + return rc; +} + +/* + * source validation type + */ +#define SVT_NO_VERIFY 0x0 /* no verification is required */ +#define SVT_VERIFY_SID_SQ 0x1 /* verify using SID and SQ fields */ +#define SVT_VERIFY_BUS 0x2 /* verify bus of request-id */ + +/* + * source-id qualifier + */ +#define SQ_ALL_16 0x0 /* verify all 16 bits of request-id */ +#define SQ_13_IGNORE_1 0x1 /* verify most significant 13 bits, ignore + * the third least significant bit + */ +#define SQ_13_IGNORE_2 0x2 /* verify most significant 13 bits, ignore + * the second and third least significant bits + */ +#define SQ_13_IGNORE_3 0x3 /* verify most significant 13 bits, ignore + * the least three significant bits + */ + +/* + * set SVT, SQ and SID fields of irte to verify + * source ids of interrupt requests + */ +static void set_irte_sid(struct irte *irte, unsigned int svt, + unsigned int sq, unsigned int sid) +{ + if (disable_sourceid_checking) + svt = SVT_NO_VERIFY; + irte->svt = svt; + irte->sq = sq; + irte->sid = sid; +} + +int set_ioapic_sid(struct irte *irte, int apic) +{ + int i; + u16 sid = 0; + + if (!irte) + return -1; + + for (i = 0; i < MAX_IO_APICS; i++) { + if (ir_ioapic[i].id == apic) { + sid = (ir_ioapic[i].bus << 8) | ir_ioapic[i].devfn; + break; + } + } + + if (sid == 0) { + pr_warning("Failed to set source-id of IOAPIC (%d)\n", apic); + return -1; + } + + set_irte_sid(irte, 1, 0, sid); + + return 0; +} + +int set_hpet_sid(struct irte *irte, u8 id) +{ + int i; + u16 sid = 0; + + if (!irte) + return -1; + + for (i = 0; i < MAX_HPET_TBS; i++) { + if (ir_hpet[i].id == id) { + sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn; + break; + } + } + + if (sid == 0) { + pr_warning("Failed to set source-id of HPET block (%d)\n", id); + return -1; + } + + /* + * Should really use SQ_ALL_16. Some platforms are broken. + * While we figure out the right quirks for these broken platforms, use + * SQ_13_IGNORE_3 for now. + */ + set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid); + + return 0; +} + +int set_msi_sid(struct irte *irte, struct pci_dev *dev) +{ + struct pci_dev *bridge; + + if (!irte || !dev) + return -1; + + /* PCIe device or Root Complex integrated PCI device */ + if (pci_is_pcie(dev) || !dev->bus->parent) { + set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, + (dev->bus->number << 8) | dev->devfn); + return 0; + } + + bridge = pci_find_upstream_pcie_bridge(dev); + if (bridge) { + if (pci_is_pcie(bridge))/* this is a PCIe-to-PCI/PCIX bridge */ + set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16, + (bridge->bus->number << 8) | dev->bus->number); + else /* this is a legacy PCI bridge */ + set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, + (bridge->bus->number << 8) | bridge->devfn); + } + + return 0; +} + +static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) +{ + u64 addr; + u32 sts; + unsigned long flags; + + addr = virt_to_phys((void *)iommu->ir_table->base); + + spin_lock_irqsave(&iommu->register_lock, flags); + + dmar_writeq(iommu->reg + DMAR_IRTA_REG, + (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE); + + /* Set interrupt-remapping table pointer */ + iommu->gcmd |= DMA_GCMD_SIRTP; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (sts & DMA_GSTS_IRTPS), sts); + spin_unlock_irqrestore(&iommu->register_lock, flags); + + /* + * global invalidation of interrupt entry cache before enabling + * interrupt-remapping. + */ + qi_global_iec(iommu); + + spin_lock_irqsave(&iommu->register_lock, flags); + + /* Enable interrupt-remapping */ + iommu->gcmd |= DMA_GCMD_IRE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, (sts & DMA_GSTS_IRES), sts); + + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + + +static int setup_intr_remapping(struct intel_iommu *iommu, int mode) +{ + struct ir_table *ir_table; + struct page *pages; + + ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table), + GFP_ATOMIC); + + if (!iommu->ir_table) + return -ENOMEM; + + pages = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO, + INTR_REMAP_PAGE_ORDER); + + if (!pages) { + printk(KERN_ERR "failed to allocate pages of order %d\n", + INTR_REMAP_PAGE_ORDER); + kfree(iommu->ir_table); + return -ENOMEM; + } + + ir_table->base = page_address(pages); + + iommu_set_intr_remapping(iommu, mode); + return 0; +} + +/* + * Disable Interrupt Remapping. + */ +static void iommu_disable_intr_remapping(struct intel_iommu *iommu) +{ + unsigned long flags; + u32 sts; + + if (!ecap_ir_support(iommu->ecap)) + return; + + /* + * global invalidation of interrupt entry cache before disabling + * interrupt-remapping. + */ + qi_global_iec(iommu); + + spin_lock_irqsave(&iommu->register_lock, flags); + + sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); + if (!(sts & DMA_GSTS_IRES)) + goto end; + + iommu->gcmd &= ~DMA_GCMD_IRE; + writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); + + IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, + readl, !(sts & DMA_GSTS_IRES), sts); + +end: + spin_unlock_irqrestore(&iommu->register_lock, flags); +} + +int __init intr_remapping_supported(void) +{ + struct dmar_drhd_unit *drhd; + + if (disable_intremap) + return 0; + + if (!dmar_ir_support()) + return 0; + + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + if (!ecap_ir_support(iommu->ecap)) + return 0; + } + + return 1; +} + +int __init enable_intr_remapping(int eim) +{ + struct dmar_drhd_unit *drhd; + int setup = 0; + + if (parse_ioapics_under_ir() != 1) { + printk(KERN_INFO "Not enable interrupt remapping\n"); + return -1; + } + + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + /* + * If the queued invalidation is already initialized, + * shouldn't disable it. + */ + if (iommu->qi) + continue; + + /* + * Clear previous faults. + */ + dmar_fault(-1, iommu); + + /* + * Disable intr remapping and queued invalidation, if already + * enabled prior to OS handover. + */ + iommu_disable_intr_remapping(iommu); + + dmar_disable_qi(iommu); + } + + /* + * check for the Interrupt-remapping support + */ + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + if (!ecap_ir_support(iommu->ecap)) + continue; + + if (eim && !ecap_eim_support(iommu->ecap)) { + printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, " + " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap); + return -1; + } + } + + /* + * Enable queued invalidation for all the DRHD's. + */ + for_each_drhd_unit(drhd) { + int ret; + struct intel_iommu *iommu = drhd->iommu; + ret = dmar_enable_qi(iommu); + + if (ret) { + printk(KERN_ERR "DRHD %Lx: failed to enable queued, " + " invalidation, ecap %Lx, ret %d\n", + drhd->reg_base_addr, iommu->ecap, ret); + return -1; + } + } + + /* + * Setup Interrupt-remapping for all the DRHD's now. + */ + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + if (!ecap_ir_support(iommu->ecap)) + continue; + + if (setup_intr_remapping(iommu, eim)) + goto error; + + setup = 1; + } + + if (!setup) + goto error; + + intr_remapping_enabled = 1; + + return 0; + +error: + /* + * handle error condition gracefully here! + */ + return -1; +} + +static void ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope, + struct intel_iommu *iommu) +{ + struct acpi_dmar_pci_path *path; + u8 bus; + int count; + + bus = scope->bus; + path = (struct acpi_dmar_pci_path *)(scope + 1); + count = (scope->length - sizeof(struct acpi_dmar_device_scope)) + / sizeof(struct acpi_dmar_pci_path); + + while (--count > 0) { + /* + * Access PCI directly due to the PCI + * subsystem isn't initialized yet. + */ + bus = read_pci_config_byte(bus, path->dev, path->fn, + PCI_SECONDARY_BUS); + path++; + } + ir_hpet[ir_hpet_num].bus = bus; + ir_hpet[ir_hpet_num].devfn = PCI_DEVFN(path->dev, path->fn); + ir_hpet[ir_hpet_num].iommu = iommu; + ir_hpet[ir_hpet_num].id = scope->enumeration_id; + ir_hpet_num++; +} + +static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope, + struct intel_iommu *iommu) +{ + struct acpi_dmar_pci_path *path; + u8 bus; + int count; + + bus = scope->bus; + path = (struct acpi_dmar_pci_path *)(scope + 1); + count = (scope->length - sizeof(struct acpi_dmar_device_scope)) + / sizeof(struct acpi_dmar_pci_path); + + while (--count > 0) { + /* + * Access PCI directly due to the PCI + * subsystem isn't initialized yet. + */ + bus = read_pci_config_byte(bus, path->dev, path->fn, + PCI_SECONDARY_BUS); + path++; + } + + ir_ioapic[ir_ioapic_num].bus = bus; + ir_ioapic[ir_ioapic_num].devfn = PCI_DEVFN(path->dev, path->fn); + ir_ioapic[ir_ioapic_num].iommu = iommu; + ir_ioapic[ir_ioapic_num].id = scope->enumeration_id; + ir_ioapic_num++; +} + +static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header, + struct intel_iommu *iommu) +{ + struct acpi_dmar_hardware_unit *drhd; + struct acpi_dmar_device_scope *scope; + void *start, *end; + + drhd = (struct acpi_dmar_hardware_unit *)header; + + start = (void *)(drhd + 1); + end = ((void *)drhd) + header->length; + + while (start < end) { + scope = start; + if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) { + if (ir_ioapic_num == MAX_IO_APICS) { + printk(KERN_WARNING "Exceeded Max IO APICS\n"); + return -1; + } + + printk(KERN_INFO "IOAPIC id %d under DRHD base " + " 0x%Lx IOMMU %d\n", scope->enumeration_id, + drhd->address, iommu->seq_id); + + ir_parse_one_ioapic_scope(scope, iommu); + } else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET) { + if (ir_hpet_num == MAX_HPET_TBS) { + printk(KERN_WARNING "Exceeded Max HPET blocks\n"); + return -1; + } + + printk(KERN_INFO "HPET id %d under DRHD base" + " 0x%Lx\n", scope->enumeration_id, + drhd->address); + + ir_parse_one_hpet_scope(scope, iommu); + } + start += scope->length; + } + + return 0; +} + +/* + * Finds the assocaition between IOAPIC's and its Interrupt-remapping + * hardware unit. + */ +int __init parse_ioapics_under_ir(void) +{ + struct dmar_drhd_unit *drhd; + int ir_supported = 0; + + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + if (ecap_ir_support(iommu->ecap)) { + if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu)) + return -1; + + ir_supported = 1; + } + } + + if (ir_supported && ir_ioapic_num != nr_ioapics) { + printk(KERN_WARNING + "Not all IO-APIC's listed under remapping hardware\n"); + return -1; + } + + return ir_supported; +} + +void disable_intr_remapping(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + + /* + * Disable Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + iommu_disable_intr_remapping(iommu); + } +} + +int reenable_intr_remapping(int eim) +{ + struct dmar_drhd_unit *drhd; + int setup = 0; + struct intel_iommu *iommu = NULL; + + for_each_iommu(iommu, drhd) + if (iommu->qi) + dmar_reenable_qi(iommu); + + /* + * Setup Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + /* Set up interrupt remapping for iommu.*/ + iommu_set_intr_remapping(iommu, eim); + setup = 1; + } + + if (!setup) + goto error; + + return 0; + +error: + /* + * handle error condition gracefully here! + */ + return -1; +} + diff --git a/drivers/iommu/intr_remapping.h b/drivers/iommu/intr_remapping.h new file mode 100644 index 00000000000..5662fecfee6 --- /dev/null +++ b/drivers/iommu/intr_remapping.h @@ -0,0 +1,17 @@ +#include <linux/intel-iommu.h> + +struct ioapic_scope { + struct intel_iommu *iommu; + unsigned int id; + unsigned int bus; /* PCI bus number */ + unsigned int devfn; /* PCI devfn number */ +}; + +struct hpet_scope { + struct intel_iommu *iommu; + u8 id; + unsigned int bus; + unsigned int devfn; +}; + +#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c new file mode 100644 index 00000000000..6e6b6a11b3c --- /dev/null +++ b/drivers/iommu/iommu.c @@ -0,0 +1,124 @@ +/* + * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. + * Author: Joerg Roedel <joerg.roedel@amd.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/bug.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/errno.h> +#include <linux/iommu.h> + +static struct iommu_ops *iommu_ops; + +void register_iommu(struct iommu_ops *ops) +{ + if (iommu_ops) + BUG(); + + iommu_ops = ops; +} + +bool iommu_found(void) +{ + return iommu_ops != NULL; +} +EXPORT_SYMBOL_GPL(iommu_found); + +struct iommu_domain *iommu_domain_alloc(void) +{ + struct iommu_domain *domain; + int ret; + + domain = kmalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) + return NULL; + + ret = iommu_ops->domain_init(domain); + if (ret) + goto out_free; + + return domain; + +out_free: + kfree(domain); + + return NULL; +} +EXPORT_SYMBOL_GPL(iommu_domain_alloc); + +void iommu_domain_free(struct iommu_domain *domain) +{ + iommu_ops->domain_destroy(domain); + kfree(domain); +} +EXPORT_SYMBOL_GPL(iommu_domain_free); + +int iommu_attach_device(struct iommu_domain *domain, struct device *dev) +{ + return iommu_ops->attach_dev(domain, dev); +} +EXPORT_SYMBOL_GPL(iommu_attach_device); + +void iommu_detach_device(struct iommu_domain *domain, struct device *dev) +{ + iommu_ops->detach_dev(domain, dev); +} +EXPORT_SYMBOL_GPL(iommu_detach_device); + +phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, + unsigned long iova) +{ + return iommu_ops->iova_to_phys(domain, iova); +} +EXPORT_SYMBOL_GPL(iommu_iova_to_phys); + +int iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + return iommu_ops->domain_has_cap(domain, cap); +} +EXPORT_SYMBOL_GPL(iommu_domain_has_cap); + +int iommu_map(struct iommu_domain *domain, unsigned long iova, + phys_addr_t paddr, int gfp_order, int prot) +{ + unsigned long invalid_mask; + size_t size; + + size = 0x1000UL << gfp_order; + invalid_mask = size - 1; + + BUG_ON((iova | paddr) & invalid_mask); + + return iommu_ops->map(domain, iova, paddr, gfp_order, prot); +} +EXPORT_SYMBOL_GPL(iommu_map); + +int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order) +{ + unsigned long invalid_mask; + size_t size; + + size = 0x1000UL << gfp_order; + invalid_mask = size - 1; + + BUG_ON(iova & invalid_mask); + + return iommu_ops->unmap(domain, iova, gfp_order); +} +EXPORT_SYMBOL_GPL(iommu_unmap); diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c new file mode 100644 index 00000000000..c5c274ab5c5 --- /dev/null +++ b/drivers/iommu/iova.c @@ -0,0 +1,435 @@ +/* + * Copyright © 2006-2009, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> + */ + +#include <linux/iova.h> + +void +init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit) +{ + spin_lock_init(&iovad->iova_rbtree_lock); + iovad->rbroot = RB_ROOT; + iovad->cached32_node = NULL; + iovad->dma_32bit_pfn = pfn_32bit; +} + +static struct rb_node * +__get_cached_rbnode(struct iova_domain *iovad, unsigned long *limit_pfn) +{ + if ((*limit_pfn != iovad->dma_32bit_pfn) || + (iovad->cached32_node == NULL)) + return rb_last(&iovad->rbroot); + else { + struct rb_node *prev_node = rb_prev(iovad->cached32_node); + struct iova *curr_iova = + container_of(iovad->cached32_node, struct iova, node); + *limit_pfn = curr_iova->pfn_lo - 1; + return prev_node; + } +} + +static void +__cached_rbnode_insert_update(struct iova_domain *iovad, + unsigned long limit_pfn, struct iova *new) +{ + if (limit_pfn != iovad->dma_32bit_pfn) + return; + iovad->cached32_node = &new->node; +} + +static void +__cached_rbnode_delete_update(struct iova_domain *iovad, struct iova *free) +{ + struct iova *cached_iova; + struct rb_node *curr; + + if (!iovad->cached32_node) + return; + curr = iovad->cached32_node; + cached_iova = container_of(curr, struct iova, node); + + if (free->pfn_lo >= cached_iova->pfn_lo) { + struct rb_node *node = rb_next(&free->node); + struct iova *iova = container_of(node, struct iova, node); + + /* only cache if it's below 32bit pfn */ + if (node && iova->pfn_lo < iovad->dma_32bit_pfn) + iovad->cached32_node = node; + else + iovad->cached32_node = NULL; + } +} + +/* Computes the padding size required, to make the + * the start address naturally aligned on its size + */ +static int +iova_get_pad_size(int size, unsigned int limit_pfn) +{ + unsigned int pad_size = 0; + unsigned int order = ilog2(size); + + if (order) + pad_size = (limit_pfn + 1) % (1 << order); + + return pad_size; +} + +static int __alloc_and_insert_iova_range(struct iova_domain *iovad, + unsigned long size, unsigned long limit_pfn, + struct iova *new, bool size_aligned) +{ + struct rb_node *prev, *curr = NULL; + unsigned long flags; + unsigned long saved_pfn; + unsigned int pad_size = 0; + + /* Walk the tree backwards */ + spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); + saved_pfn = limit_pfn; + curr = __get_cached_rbnode(iovad, &limit_pfn); + prev = curr; + while (curr) { + struct iova *curr_iova = container_of(curr, struct iova, node); + + if (limit_pfn < curr_iova->pfn_lo) + goto move_left; + else if (limit_pfn < curr_iova->pfn_hi) + goto adjust_limit_pfn; + else { + if (size_aligned) + pad_size = iova_get_pad_size(size, limit_pfn); + if ((curr_iova->pfn_hi + size + pad_size) <= limit_pfn) + break; /* found a free slot */ + } +adjust_limit_pfn: + limit_pfn = curr_iova->pfn_lo - 1; +move_left: + prev = curr; + curr = rb_prev(curr); + } + + if (!curr) { + if (size_aligned) + pad_size = iova_get_pad_size(size, limit_pfn); + if ((IOVA_START_PFN + size + pad_size) > limit_pfn) { + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + return -ENOMEM; + } + } + + /* pfn_lo will point to size aligned address if size_aligned is set */ + new->pfn_lo = limit_pfn - (size + pad_size) + 1; + new->pfn_hi = new->pfn_lo + size - 1; + + /* Insert the new_iova into domain rbtree by holding writer lock */ + /* Add new node and rebalance tree. */ + { + struct rb_node **entry, *parent = NULL; + + /* If we have 'prev', it's a valid place to start the + insertion. Otherwise, start from the root. */ + if (prev) + entry = &prev; + else + entry = &iovad->rbroot.rb_node; + + /* Figure out where to put new node */ + while (*entry) { + struct iova *this = container_of(*entry, + struct iova, node); + parent = *entry; + + if (new->pfn_lo < this->pfn_lo) + entry = &((*entry)->rb_left); + else if (new->pfn_lo > this->pfn_lo) + entry = &((*entry)->rb_right); + else + BUG(); /* this should not happen */ + } + + /* Add new node and rebalance tree. */ + rb_link_node(&new->node, parent, entry); + rb_insert_color(&new->node, &iovad->rbroot); + } + __cached_rbnode_insert_update(iovad, saved_pfn, new); + + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + + + return 0; +} + +static void +iova_insert_rbtree(struct rb_root *root, struct iova *iova) +{ + struct rb_node **new = &(root->rb_node), *parent = NULL; + /* Figure out where to put new node */ + while (*new) { + struct iova *this = container_of(*new, struct iova, node); + parent = *new; + + if (iova->pfn_lo < this->pfn_lo) + new = &((*new)->rb_left); + else if (iova->pfn_lo > this->pfn_lo) + new = &((*new)->rb_right); + else + BUG(); /* this should not happen */ + } + /* Add new node and rebalance tree. */ + rb_link_node(&iova->node, parent, new); + rb_insert_color(&iova->node, root); +} + +/** + * alloc_iova - allocates an iova + * @iovad - iova domain in question + * @size - size of page frames to allocate + * @limit_pfn - max limit address + * @size_aligned - set if size_aligned address range is required + * This function allocates an iova in the range limit_pfn to IOVA_START_PFN + * looking from limit_pfn instead from IOVA_START_PFN. If the size_aligned + * flag is set then the allocated address iova->pfn_lo will be naturally + * aligned on roundup_power_of_two(size). + */ +struct iova * +alloc_iova(struct iova_domain *iovad, unsigned long size, + unsigned long limit_pfn, + bool size_aligned) +{ + struct iova *new_iova; + int ret; + + new_iova = alloc_iova_mem(); + if (!new_iova) + return NULL; + + /* If size aligned is set then round the size to + * to next power of two. + */ + if (size_aligned) + size = __roundup_pow_of_two(size); + + ret = __alloc_and_insert_iova_range(iovad, size, limit_pfn, + new_iova, size_aligned); + + if (ret) { + free_iova_mem(new_iova); + return NULL; + } + + return new_iova; +} + +/** + * find_iova - find's an iova for a given pfn + * @iovad - iova domain in question. + * pfn - page frame number + * This function finds and returns an iova belonging to the + * given doamin which matches the given pfn. + */ +struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn) +{ + unsigned long flags; + struct rb_node *node; + + /* Take the lock so that no other thread is manipulating the rbtree */ + spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); + node = iovad->rbroot.rb_node; + while (node) { + struct iova *iova = container_of(node, struct iova, node); + + /* If pfn falls within iova's range, return iova */ + if ((pfn >= iova->pfn_lo) && (pfn <= iova->pfn_hi)) { + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + /* We are not holding the lock while this iova + * is referenced by the caller as the same thread + * which called this function also calls __free_iova() + * and it is by desing that only one thread can possibly + * reference a particular iova and hence no conflict. + */ + return iova; + } + + if (pfn < iova->pfn_lo) + node = node->rb_left; + else if (pfn > iova->pfn_lo) + node = node->rb_right; + } + + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + return NULL; +} + +/** + * __free_iova - frees the given iova + * @iovad: iova domain in question. + * @iova: iova in question. + * Frees the given iova belonging to the giving domain + */ +void +__free_iova(struct iova_domain *iovad, struct iova *iova) +{ + unsigned long flags; + + spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); + __cached_rbnode_delete_update(iovad, iova); + rb_erase(&iova->node, &iovad->rbroot); + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + free_iova_mem(iova); +} + +/** + * free_iova - finds and frees the iova for a given pfn + * @iovad: - iova domain in question. + * @pfn: - pfn that is allocated previously + * This functions finds an iova for a given pfn and then + * frees the iova from that domain. + */ +void +free_iova(struct iova_domain *iovad, unsigned long pfn) +{ + struct iova *iova = find_iova(iovad, pfn); + if (iova) + __free_iova(iovad, iova); + +} + +/** + * put_iova_domain - destroys the iova doamin + * @iovad: - iova domain in question. + * All the iova's in that domain are destroyed. + */ +void put_iova_domain(struct iova_domain *iovad) +{ + struct rb_node *node; + unsigned long flags; + + spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); + node = rb_first(&iovad->rbroot); + while (node) { + struct iova *iova = container_of(node, struct iova, node); + rb_erase(node, &iovad->rbroot); + free_iova_mem(iova); + node = rb_first(&iovad->rbroot); + } + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); +} + +static int +__is_range_overlap(struct rb_node *node, + unsigned long pfn_lo, unsigned long pfn_hi) +{ + struct iova *iova = container_of(node, struct iova, node); + + if ((pfn_lo <= iova->pfn_hi) && (pfn_hi >= iova->pfn_lo)) + return 1; + return 0; +} + +static struct iova * +__insert_new_range(struct iova_domain *iovad, + unsigned long pfn_lo, unsigned long pfn_hi) +{ + struct iova *iova; + + iova = alloc_iova_mem(); + if (!iova) + return iova; + + iova->pfn_hi = pfn_hi; + iova->pfn_lo = pfn_lo; + iova_insert_rbtree(&iovad->rbroot, iova); + return iova; +} + +static void +__adjust_overlap_range(struct iova *iova, + unsigned long *pfn_lo, unsigned long *pfn_hi) +{ + if (*pfn_lo < iova->pfn_lo) + iova->pfn_lo = *pfn_lo; + if (*pfn_hi > iova->pfn_hi) + *pfn_lo = iova->pfn_hi + 1; +} + +/** + * reserve_iova - reserves an iova in the given range + * @iovad: - iova domain pointer + * @pfn_lo: - lower page frame address + * @pfn_hi:- higher pfn adderss + * This function allocates reserves the address range from pfn_lo to pfn_hi so + * that this address is not dished out as part of alloc_iova. + */ +struct iova * +reserve_iova(struct iova_domain *iovad, + unsigned long pfn_lo, unsigned long pfn_hi) +{ + struct rb_node *node; + unsigned long flags; + struct iova *iova; + unsigned int overlap = 0; + + spin_lock_irqsave(&iovad->iova_rbtree_lock, flags); + for (node = rb_first(&iovad->rbroot); node; node = rb_next(node)) { + if (__is_range_overlap(node, pfn_lo, pfn_hi)) { + iova = container_of(node, struct iova, node); + __adjust_overlap_range(iova, &pfn_lo, &pfn_hi); + if ((pfn_lo >= iova->pfn_lo) && + (pfn_hi <= iova->pfn_hi)) + goto finish; + overlap = 1; + + } else if (overlap) + break; + } + + /* We are here either because this is the first reserver node + * or need to insert remaining non overlap addr range + */ + iova = __insert_new_range(iovad, pfn_lo, pfn_hi); +finish: + + spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); + return iova; +} + +/** + * copy_reserved_iova - copies the reserved between domains + * @from: - source doamin from where to copy + * @to: - destination domin where to copy + * This function copies reserved iova's from one doamin to + * other. + */ +void +copy_reserved_iova(struct iova_domain *from, struct iova_domain *to) +{ + unsigned long flags; + struct rb_node *node; + + spin_lock_irqsave(&from->iova_rbtree_lock, flags); + for (node = rb_first(&from->rbroot); node; node = rb_next(node)) { + struct iova *iova = container_of(node, struct iova, node); + struct iova *new_iova; + new_iova = reserve_iova(to, iova->pfn_lo, iova->pfn_hi); + if (!new_iova) + printk(KERN_ERR "Reserve iova range %lx@%lx failed\n", + iova->pfn_lo, iova->pfn_lo); + } + spin_unlock_irqrestore(&from->iova_rbtree_lock, flags); +} diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c new file mode 100644 index 00000000000..1a584e077c6 --- /dev/null +++ b/drivers/iommu/msm_iommu.c @@ -0,0 +1,731 @@ +/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/iommu.h> +#include <linux/clk.h> + +#include <asm/cacheflush.h> +#include <asm/sizes.h> + +#include <mach/iommu_hw-8xxx.h> +#include <mach/iommu.h> + +#define MRC(reg, processor, op1, crn, crm, op2) \ +__asm__ __volatile__ ( \ +" mrc " #processor "," #op1 ", %0," #crn "," #crm "," #op2 "\n" \ +: "=r" (reg)) + +#define RCP15_PRRR(reg) MRC(reg, p15, 0, c10, c2, 0) +#define RCP15_NMRR(reg) MRC(reg, p15, 0, c10, c2, 1) + +static int msm_iommu_tex_class[4]; + +DEFINE_SPINLOCK(msm_iommu_lock); + +struct msm_priv { + unsigned long *pgtable; + struct list_head list_attached; +}; + +static int __enable_clocks(struct msm_iommu_drvdata *drvdata) +{ + int ret; + + ret = clk_enable(drvdata->pclk); + if (ret) + goto fail; + + if (drvdata->clk) { + ret = clk_enable(drvdata->clk); + if (ret) + clk_disable(drvdata->pclk); + } +fail: + return ret; +} + +static void __disable_clocks(struct msm_iommu_drvdata *drvdata) +{ + if (drvdata->clk) + clk_disable(drvdata->clk); + clk_disable(drvdata->pclk); +} + +static int __flush_iotlb(struct iommu_domain *domain) +{ + struct msm_priv *priv = domain->priv; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + int ret = 0; +#ifndef CONFIG_IOMMU_PGTABLES_L2 + unsigned long *fl_table = priv->pgtable; + int i; + + if (!list_empty(&priv->list_attached)) { + dmac_flush_range(fl_table, fl_table + SZ_16K); + + for (i = 0; i < NUM_FL_PTE; i++) + if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) { + void *sl_table = __va(fl_table[i] & + FL_BASE_MASK); + dmac_flush_range(sl_table, sl_table + SZ_4K); + } + } +#endif + + list_for_each_entry(ctx_drvdata, &priv->list_attached, attached_elm) { + if (!ctx_drvdata->pdev || !ctx_drvdata->pdev->dev.parent) + BUG(); + + iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent); + BUG_ON(!iommu_drvdata); + + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + + SET_CTX_TLBIALL(iommu_drvdata->base, ctx_drvdata->num, 0); + __disable_clocks(iommu_drvdata); + } +fail: + return ret; +} + +static void __reset_context(void __iomem *base, int ctx) +{ + SET_BPRCOSH(base, ctx, 0); + SET_BPRCISH(base, ctx, 0); + SET_BPRCNSH(base, ctx, 0); + SET_BPSHCFG(base, ctx, 0); + SET_BPMTCFG(base, ctx, 0); + SET_ACTLR(base, ctx, 0); + SET_SCTLR(base, ctx, 0); + SET_FSRRESTORE(base, ctx, 0); + SET_TTBR0(base, ctx, 0); + SET_TTBR1(base, ctx, 0); + SET_TTBCR(base, ctx, 0); + SET_BFBCR(base, ctx, 0); + SET_PAR(base, ctx, 0); + SET_FAR(base, ctx, 0); + SET_CTX_TLBIALL(base, ctx, 0); + SET_TLBFLPTER(base, ctx, 0); + SET_TLBSLPTER(base, ctx, 0); + SET_TLBLKCR(base, ctx, 0); + SET_PRRR(base, ctx, 0); + SET_NMRR(base, ctx, 0); +} + +static void __program_context(void __iomem *base, int ctx, phys_addr_t pgtable) +{ + unsigned int prrr, nmrr; + __reset_context(base, ctx); + + /* Set up HTW mode */ + /* TLB miss configuration: perform HTW on miss */ + SET_TLBMCFG(base, ctx, 0x3); + + /* V2P configuration: HTW for access */ + SET_V2PCFG(base, ctx, 0x3); + + SET_TTBCR(base, ctx, 0); + SET_TTBR0_PA(base, ctx, (pgtable >> 14)); + + /* Invalidate the TLB for this context */ + SET_CTX_TLBIALL(base, ctx, 0); + + /* Set interrupt number to "secure" interrupt */ + SET_IRPTNDX(base, ctx, 0); + + /* Enable context fault interrupt */ + SET_CFEIE(base, ctx, 1); + + /* Stall access on a context fault and let the handler deal with it */ + SET_CFCFG(base, ctx, 1); + + /* Redirect all cacheable requests to L2 slave port. */ + SET_RCISH(base, ctx, 1); + SET_RCOSH(base, ctx, 1); + SET_RCNSH(base, ctx, 1); + + /* Turn on TEX Remap */ + SET_TRE(base, ctx, 1); + + /* Set TEX remap attributes */ + RCP15_PRRR(prrr); + RCP15_NMRR(nmrr); + SET_PRRR(base, ctx, prrr); + SET_NMRR(base, ctx, nmrr); + + /* Turn on BFB prefetch */ + SET_BFBDFE(base, ctx, 1); + +#ifdef CONFIG_IOMMU_PGTABLES_L2 + /* Configure page tables as inner-cacheable and shareable to reduce + * the TLB miss penalty. + */ + SET_TTBR0_SH(base, ctx, 1); + SET_TTBR1_SH(base, ctx, 1); + + SET_TTBR0_NOS(base, ctx, 1); + SET_TTBR1_NOS(base, ctx, 1); + + SET_TTBR0_IRGNH(base, ctx, 0); /* WB, WA */ + SET_TTBR0_IRGNL(base, ctx, 1); + + SET_TTBR1_IRGNH(base, ctx, 0); /* WB, WA */ + SET_TTBR1_IRGNL(base, ctx, 1); + + SET_TTBR0_ORGN(base, ctx, 1); /* WB, WA */ + SET_TTBR1_ORGN(base, ctx, 1); /* WB, WA */ +#endif + + /* Enable the MMU */ + SET_M(base, ctx, 1); +} + +static int msm_iommu_domain_init(struct iommu_domain *domain) +{ + struct msm_priv *priv = kzalloc(sizeof(*priv), GFP_KERNEL); + + if (!priv) + goto fail_nomem; + + INIT_LIST_HEAD(&priv->list_attached); + priv->pgtable = (unsigned long *)__get_free_pages(GFP_KERNEL, + get_order(SZ_16K)); + + if (!priv->pgtable) + goto fail_nomem; + + memset(priv->pgtable, 0, SZ_16K); + domain->priv = priv; + return 0; + +fail_nomem: + kfree(priv); + return -ENOMEM; +} + +static void msm_iommu_domain_destroy(struct iommu_domain *domain) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + int i; + + spin_lock_irqsave(&msm_iommu_lock, flags); + priv = domain->priv; + domain->priv = NULL; + + if (priv) { + fl_table = priv->pgtable; + + for (i = 0; i < NUM_FL_PTE; i++) + if ((fl_table[i] & 0x03) == FL_TYPE_TABLE) + free_page((unsigned long) __va(((fl_table[i]) & + FL_BASE_MASK))); + + free_pages((unsigned long)priv->pgtable, get_order(SZ_16K)); + priv->pgtable = NULL; + } + + kfree(priv); + spin_unlock_irqrestore(&msm_iommu_lock, flags); +} + +static int msm_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) +{ + struct msm_priv *priv; + struct msm_iommu_ctx_dev *ctx_dev; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + struct msm_iommu_ctx_drvdata *tmp_drvdata; + int ret = 0; + unsigned long flags; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + + if (!priv || !dev) { + ret = -EINVAL; + goto fail; + } + + iommu_drvdata = dev_get_drvdata(dev->parent); + ctx_drvdata = dev_get_drvdata(dev); + ctx_dev = dev->platform_data; + + if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) { + ret = -EINVAL; + goto fail; + } + + if (!list_empty(&ctx_drvdata->attached_elm)) { + ret = -EBUSY; + goto fail; + } + + list_for_each_entry(tmp_drvdata, &priv->list_attached, attached_elm) + if (tmp_drvdata == ctx_drvdata) { + ret = -EBUSY; + goto fail; + } + + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + + __program_context(iommu_drvdata->base, ctx_dev->num, + __pa(priv->pgtable)); + + __disable_clocks(iommu_drvdata); + list_add(&(ctx_drvdata->attached_elm), &priv->list_attached); + ret = __flush_iotlb(domain); + +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static void msm_iommu_detach_dev(struct iommu_domain *domain, + struct device *dev) +{ + struct msm_priv *priv; + struct msm_iommu_ctx_dev *ctx_dev; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + unsigned long flags; + int ret; + + spin_lock_irqsave(&msm_iommu_lock, flags); + priv = domain->priv; + + if (!priv || !dev) + goto fail; + + iommu_drvdata = dev_get_drvdata(dev->parent); + ctx_drvdata = dev_get_drvdata(dev); + ctx_dev = dev->platform_data; + + if (!iommu_drvdata || !ctx_drvdata || !ctx_dev) + goto fail; + + ret = __flush_iotlb(domain); + if (ret) + goto fail; + + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + + __reset_context(iommu_drvdata->base, ctx_dev->num); + __disable_clocks(iommu_drvdata); + list_del_init(&ctx_drvdata->attached_elm); + +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); +} + +static int msm_iommu_map(struct iommu_domain *domain, unsigned long va, + phys_addr_t pa, int order, int prot) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + unsigned long *fl_pte; + unsigned long fl_offset; + unsigned long *sl_table; + unsigned long *sl_pte; + unsigned long sl_offset; + unsigned int pgprot; + size_t len = 0x1000UL << order; + int ret = 0, tex, sh; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + sh = (prot & MSM_IOMMU_ATTR_SH) ? 1 : 0; + tex = msm_iommu_tex_class[prot & MSM_IOMMU_CP_MASK]; + + if (tex < 0 || tex > NUM_TEX_CLASS - 1) { + ret = -EINVAL; + goto fail; + } + + priv = domain->priv; + if (!priv) { + ret = -EINVAL; + goto fail; + } + + fl_table = priv->pgtable; + + if (len != SZ_16M && len != SZ_1M && + len != SZ_64K && len != SZ_4K) { + pr_debug("Bad size: %d\n", len); + ret = -EINVAL; + goto fail; + } + + if (!fl_table) { + pr_debug("Null page table\n"); + ret = -EINVAL; + goto fail; + } + + if (len == SZ_16M || len == SZ_1M) { + pgprot = sh ? FL_SHARED : 0; + pgprot |= tex & 0x01 ? FL_BUFFERABLE : 0; + pgprot |= tex & 0x02 ? FL_CACHEABLE : 0; + pgprot |= tex & 0x04 ? FL_TEX0 : 0; + } else { + pgprot = sh ? SL_SHARED : 0; + pgprot |= tex & 0x01 ? SL_BUFFERABLE : 0; + pgprot |= tex & 0x02 ? SL_CACHEABLE : 0; + pgprot |= tex & 0x04 ? SL_TEX0 : 0; + } + + fl_offset = FL_OFFSET(va); /* Upper 12 bits */ + fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */ + + if (len == SZ_16M) { + int i = 0; + for (i = 0; i < 16; i++) + *(fl_pte+i) = (pa & 0xFF000000) | FL_SUPERSECTION | + FL_AP_READ | FL_AP_WRITE | FL_TYPE_SECT | + FL_SHARED | FL_NG | pgprot; + } + + if (len == SZ_1M) + *fl_pte = (pa & 0xFFF00000) | FL_AP_READ | FL_AP_WRITE | FL_NG | + FL_TYPE_SECT | FL_SHARED | pgprot; + + /* Need a 2nd level table */ + if ((len == SZ_4K || len == SZ_64K) && (*fl_pte) == 0) { + unsigned long *sl; + sl = (unsigned long *) __get_free_pages(GFP_ATOMIC, + get_order(SZ_4K)); + + if (!sl) { + pr_debug("Could not allocate second level table\n"); + ret = -ENOMEM; + goto fail; + } + + memset(sl, 0, SZ_4K); + *fl_pte = ((((int)__pa(sl)) & FL_BASE_MASK) | FL_TYPE_TABLE); + } + + sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK)); + sl_offset = SL_OFFSET(va); + sl_pte = sl_table + sl_offset; + + + if (len == SZ_4K) + *sl_pte = (pa & SL_BASE_MASK_SMALL) | SL_AP0 | SL_AP1 | SL_NG | + SL_SHARED | SL_TYPE_SMALL | pgprot; + + if (len == SZ_64K) { + int i; + + for (i = 0; i < 16; i++) + *(sl_pte+i) = (pa & SL_BASE_MASK_LARGE) | SL_AP0 | + SL_NG | SL_AP1 | SL_SHARED | SL_TYPE_LARGE | pgprot; + } + + ret = __flush_iotlb(domain); +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va, + int order) +{ + struct msm_priv *priv; + unsigned long flags; + unsigned long *fl_table; + unsigned long *fl_pte; + unsigned long fl_offset; + unsigned long *sl_table; + unsigned long *sl_pte; + unsigned long sl_offset; + size_t len = 0x1000UL << order; + int i, ret = 0; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + + if (!priv) { + ret = -ENODEV; + goto fail; + } + + fl_table = priv->pgtable; + + if (len != SZ_16M && len != SZ_1M && + len != SZ_64K && len != SZ_4K) { + pr_debug("Bad length: %d\n", len); + ret = -EINVAL; + goto fail; + } + + if (!fl_table) { + pr_debug("Null page table\n"); + ret = -EINVAL; + goto fail; + } + + fl_offset = FL_OFFSET(va); /* Upper 12 bits */ + fl_pte = fl_table + fl_offset; /* int pointers, 4 bytes */ + + if (*fl_pte == 0) { + pr_debug("First level PTE is 0\n"); + ret = -ENODEV; + goto fail; + } + + /* Unmap supersection */ + if (len == SZ_16M) + for (i = 0; i < 16; i++) + *(fl_pte+i) = 0; + + if (len == SZ_1M) + *fl_pte = 0; + + sl_table = (unsigned long *) __va(((*fl_pte) & FL_BASE_MASK)); + sl_offset = SL_OFFSET(va); + sl_pte = sl_table + sl_offset; + + if (len == SZ_64K) { + for (i = 0; i < 16; i++) + *(sl_pte+i) = 0; + } + + if (len == SZ_4K) + *sl_pte = 0; + + if (len == SZ_4K || len == SZ_64K) { + int used = 0; + + for (i = 0; i < NUM_SL_PTE; i++) + if (sl_table[i]) + used = 1; + if (!used) { + free_page((unsigned long)sl_table); + *fl_pte = 0; + } + } + + ret = __flush_iotlb(domain); +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static phys_addr_t msm_iommu_iova_to_phys(struct iommu_domain *domain, + unsigned long va) +{ + struct msm_priv *priv; + struct msm_iommu_drvdata *iommu_drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata; + unsigned int par; + unsigned long flags; + void __iomem *base; + phys_addr_t ret = 0; + int ctx; + + spin_lock_irqsave(&msm_iommu_lock, flags); + + priv = domain->priv; + if (list_empty(&priv->list_attached)) + goto fail; + + ctx_drvdata = list_entry(priv->list_attached.next, + struct msm_iommu_ctx_drvdata, attached_elm); + iommu_drvdata = dev_get_drvdata(ctx_drvdata->pdev->dev.parent); + + base = iommu_drvdata->base; + ctx = ctx_drvdata->num; + + ret = __enable_clocks(iommu_drvdata); + if (ret) + goto fail; + + /* Invalidate context TLB */ + SET_CTX_TLBIALL(base, ctx, 0); + SET_V2PPR(base, ctx, va & V2Pxx_VA); + + par = GET_PAR(base, ctx); + + /* We are dealing with a supersection */ + if (GET_NOFAULT_SS(base, ctx)) + ret = (par & 0xFF000000) | (va & 0x00FFFFFF); + else /* Upper 20 bits from PAR, lower 12 from VA */ + ret = (par & 0xFFFFF000) | (va & 0x00000FFF); + + if (GET_FAULT(base, ctx)) + ret = 0; + + __disable_clocks(iommu_drvdata); +fail: + spin_unlock_irqrestore(&msm_iommu_lock, flags); + return ret; +} + +static int msm_iommu_domain_has_cap(struct iommu_domain *domain, + unsigned long cap) +{ + return 0; +} + +static void print_ctx_regs(void __iomem *base, int ctx) +{ + unsigned int fsr = GET_FSR(base, ctx); + pr_err("FAR = %08x PAR = %08x\n", + GET_FAR(base, ctx), GET_PAR(base, ctx)); + pr_err("FSR = %08x [%s%s%s%s%s%s%s%s%s%s]\n", fsr, + (fsr & 0x02) ? "TF " : "", + (fsr & 0x04) ? "AFF " : "", + (fsr & 0x08) ? "APF " : "", + (fsr & 0x10) ? "TLBMF " : "", + (fsr & 0x20) ? "HTWDEEF " : "", + (fsr & 0x40) ? "HTWSEEF " : "", + (fsr & 0x80) ? "MHF " : "", + (fsr & 0x10000) ? "SL " : "", + (fsr & 0x40000000) ? "SS " : "", + (fsr & 0x80000000) ? "MULTI " : ""); + + pr_err("FSYNR0 = %08x FSYNR1 = %08x\n", + GET_FSYNR0(base, ctx), GET_FSYNR1(base, ctx)); + pr_err("TTBR0 = %08x TTBR1 = %08x\n", + GET_TTBR0(base, ctx), GET_TTBR1(base, ctx)); + pr_err("SCTLR = %08x ACTLR = %08x\n", + GET_SCTLR(base, ctx), GET_ACTLR(base, ctx)); + pr_err("PRRR = %08x NMRR = %08x\n", + GET_PRRR(base, ctx), GET_NMRR(base, ctx)); +} + +irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id) +{ + struct msm_iommu_drvdata *drvdata = dev_id; + void __iomem *base; + unsigned int fsr; + int i, ret; + + spin_lock(&msm_iommu_lock); + + if (!drvdata) { + pr_err("Invalid device ID in context interrupt handler\n"); + goto fail; + } + + base = drvdata->base; + + pr_err("Unexpected IOMMU page fault!\n"); + pr_err("base = %08x\n", (unsigned int) base); + + ret = __enable_clocks(drvdata); + if (ret) + goto fail; + + for (i = 0; i < drvdata->ncb; i++) { + fsr = GET_FSR(base, i); + if (fsr) { + pr_err("Fault occurred in context %d.\n", i); + pr_err("Interesting registers:\n"); + print_ctx_regs(base, i); + SET_FSR(base, i, 0x4000000F); + } + } + __disable_clocks(drvdata); +fail: + spin_unlock(&msm_iommu_lock); + return 0; +} + +static struct iommu_ops msm_iommu_ops = { + .domain_init = msm_iommu_domain_init, + .domain_destroy = msm_iommu_domain_destroy, + .attach_dev = msm_iommu_attach_dev, + .detach_dev = msm_iommu_detach_dev, + .map = msm_iommu_map, + .unmap = msm_iommu_unmap, + .iova_to_phys = msm_iommu_iova_to_phys, + .domain_has_cap = msm_iommu_domain_has_cap +}; + +static int __init get_tex_class(int icp, int ocp, int mt, int nos) +{ + int i = 0; + unsigned int prrr = 0; + unsigned int nmrr = 0; + int c_icp, c_ocp, c_mt, c_nos; + + RCP15_PRRR(prrr); + RCP15_NMRR(nmrr); + + for (i = 0; i < NUM_TEX_CLASS; i++) { + c_nos = PRRR_NOS(prrr, i); + c_mt = PRRR_MT(prrr, i); + c_icp = NMRR_ICP(nmrr, i); + c_ocp = NMRR_OCP(nmrr, i); + + if (icp == c_icp && ocp == c_ocp && c_mt == mt && c_nos == nos) + return i; + } + + return -ENODEV; +} + +static void __init setup_iommu_tex_classes(void) +{ + msm_iommu_tex_class[MSM_IOMMU_ATTR_NONCACHED] = + get_tex_class(CP_NONCACHED, CP_NONCACHED, MT_NORMAL, 1); + + msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_WA] = + get_tex_class(CP_WB_WA, CP_WB_WA, MT_NORMAL, 1); + + msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WB_NWA] = + get_tex_class(CP_WB_NWA, CP_WB_NWA, MT_NORMAL, 1); + + msm_iommu_tex_class[MSM_IOMMU_ATTR_CACHED_WT] = + get_tex_class(CP_WT, CP_WT, MT_NORMAL, 1); +} + +static int __init msm_iommu_init(void) +{ + setup_iommu_tex_classes(); + register_iommu(&msm_iommu_ops); + return 0; +} + +subsys_initcall(msm_iommu_init); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); diff --git a/drivers/iommu/msm_iommu_dev.c b/drivers/iommu/msm_iommu_dev.c new file mode 100644 index 00000000000..8e8fb079852 --- /dev/null +++ b/drivers/iommu/msm_iommu_dev.c @@ -0,0 +1,422 @@ +/* Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/clk.h> +#include <linux/iommu.h> +#include <linux/interrupt.h> +#include <linux/err.h> +#include <linux/slab.h> + +#include <mach/iommu_hw-8xxx.h> +#include <mach/iommu.h> +#include <mach/clk.h> + +struct iommu_ctx_iter_data { + /* input */ + const char *name; + + /* output */ + struct device *dev; +}; + +static struct platform_device *msm_iommu_root_dev; + +static int each_iommu_ctx(struct device *dev, void *data) +{ + struct iommu_ctx_iter_data *res = data; + struct msm_iommu_ctx_dev *c = dev->platform_data; + + if (!res || !c || !c->name || !res->name) + return -EINVAL; + + if (!strcmp(res->name, c->name)) { + res->dev = dev; + return 1; + } + return 0; +} + +static int each_iommu(struct device *dev, void *data) +{ + return device_for_each_child(dev, data, each_iommu_ctx); +} + +struct device *msm_iommu_get_ctx(const char *ctx_name) +{ + struct iommu_ctx_iter_data r; + int found; + + if (!msm_iommu_root_dev) { + pr_err("No root IOMMU device.\n"); + goto fail; + } + + r.name = ctx_name; + found = device_for_each_child(&msm_iommu_root_dev->dev, &r, each_iommu); + + if (!found) { + pr_err("Could not find context <%s>\n", ctx_name); + goto fail; + } + + return r.dev; +fail: + return NULL; +} +EXPORT_SYMBOL(msm_iommu_get_ctx); + +static void msm_iommu_reset(void __iomem *base, int ncb) +{ + int ctx; + + SET_RPUE(base, 0); + SET_RPUEIE(base, 0); + SET_ESRRESTORE(base, 0); + SET_TBE(base, 0); + SET_CR(base, 0); + SET_SPDMBE(base, 0); + SET_TESTBUSCR(base, 0); + SET_TLBRSW(base, 0); + SET_GLOBAL_TLBIALL(base, 0); + SET_RPU_ACR(base, 0); + SET_TLBLKCRWE(base, 1); + + for (ctx = 0; ctx < ncb; ctx++) { + SET_BPRCOSH(base, ctx, 0); + SET_BPRCISH(base, ctx, 0); + SET_BPRCNSH(base, ctx, 0); + SET_BPSHCFG(base, ctx, 0); + SET_BPMTCFG(base, ctx, 0); + SET_ACTLR(base, ctx, 0); + SET_SCTLR(base, ctx, 0); + SET_FSRRESTORE(base, ctx, 0); + SET_TTBR0(base, ctx, 0); + SET_TTBR1(base, ctx, 0); + SET_TTBCR(base, ctx, 0); + SET_BFBCR(base, ctx, 0); + SET_PAR(base, ctx, 0); + SET_FAR(base, ctx, 0); + SET_CTX_TLBIALL(base, ctx, 0); + SET_TLBFLPTER(base, ctx, 0); + SET_TLBSLPTER(base, ctx, 0); + SET_TLBLKCR(base, ctx, 0); + SET_PRRR(base, ctx, 0); + SET_NMRR(base, ctx, 0); + SET_CONTEXTIDR(base, ctx, 0); + } +} + +static int msm_iommu_probe(struct platform_device *pdev) +{ + struct resource *r, *r2; + struct clk *iommu_clk; + struct clk *iommu_pclk; + struct msm_iommu_drvdata *drvdata; + struct msm_iommu_dev *iommu_dev = pdev->dev.platform_data; + void __iomem *regs_base; + resource_size_t len; + int ret, irq, par; + + if (pdev->id == -1) { + msm_iommu_root_dev = pdev; + return 0; + } + + drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL); + + if (!drvdata) { + ret = -ENOMEM; + goto fail; + } + + if (!iommu_dev) { + ret = -ENODEV; + goto fail; + } + + iommu_pclk = clk_get(NULL, "smmu_pclk"); + if (IS_ERR(iommu_pclk)) { + ret = -ENODEV; + goto fail; + } + + ret = clk_enable(iommu_pclk); + if (ret) + goto fail_enable; + + iommu_clk = clk_get(&pdev->dev, "iommu_clk"); + + if (!IS_ERR(iommu_clk)) { + if (clk_get_rate(iommu_clk) == 0) + clk_set_min_rate(iommu_clk, 1); + + ret = clk_enable(iommu_clk); + if (ret) { + clk_put(iommu_clk); + goto fail_pclk; + } + } else + iommu_clk = NULL; + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "physbase"); + + if (!r) { + ret = -ENODEV; + goto fail_clk; + } + + len = resource_size(r); + + r2 = request_mem_region(r->start, len, r->name); + if (!r2) { + pr_err("Could not request memory region: start=%p, len=%d\n", + (void *) r->start, len); + ret = -EBUSY; + goto fail_clk; + } + + regs_base = ioremap(r2->start, len); + + if (!regs_base) { + pr_err("Could not ioremap: start=%p, len=%d\n", + (void *) r2->start, len); + ret = -EBUSY; + goto fail_mem; + } + + irq = platform_get_irq_byname(pdev, "secure_irq"); + if (irq < 0) { + ret = -ENODEV; + goto fail_io; + } + + msm_iommu_reset(regs_base, iommu_dev->ncb); + + SET_M(regs_base, 0, 1); + SET_PAR(regs_base, 0, 0); + SET_V2PCFG(regs_base, 0, 1); + SET_V2PPR(regs_base, 0, 0); + par = GET_PAR(regs_base, 0); + SET_V2PCFG(regs_base, 0, 0); + SET_M(regs_base, 0, 0); + + if (!par) { + pr_err("%s: Invalid PAR value detected\n", iommu_dev->name); + ret = -ENODEV; + goto fail_io; + } + + ret = request_irq(irq, msm_iommu_fault_handler, 0, + "msm_iommu_secure_irpt_handler", drvdata); + if (ret) { + pr_err("Request IRQ %d failed with ret=%d\n", irq, ret); + goto fail_io; + } + + + drvdata->pclk = iommu_pclk; + drvdata->clk = iommu_clk; + drvdata->base = regs_base; + drvdata->irq = irq; + drvdata->ncb = iommu_dev->ncb; + + pr_info("device %s mapped at %p, irq %d with %d ctx banks\n", + iommu_dev->name, regs_base, irq, iommu_dev->ncb); + + platform_set_drvdata(pdev, drvdata); + + if (iommu_clk) + clk_disable(iommu_clk); + + clk_disable(iommu_pclk); + + return 0; +fail_io: + iounmap(regs_base); +fail_mem: + release_mem_region(r->start, len); +fail_clk: + if (iommu_clk) { + clk_disable(iommu_clk); + clk_put(iommu_clk); + } +fail_pclk: + clk_disable(iommu_pclk); +fail_enable: + clk_put(iommu_pclk); +fail: + kfree(drvdata); + return ret; +} + +static int msm_iommu_remove(struct platform_device *pdev) +{ + struct msm_iommu_drvdata *drv = NULL; + + drv = platform_get_drvdata(pdev); + if (drv) { + if (drv->clk) + clk_put(drv->clk); + clk_put(drv->pclk); + memset(drv, 0, sizeof(*drv)); + kfree(drv); + platform_set_drvdata(pdev, NULL); + } + return 0; +} + +static int msm_iommu_ctx_probe(struct platform_device *pdev) +{ + struct msm_iommu_ctx_dev *c = pdev->dev.platform_data; + struct msm_iommu_drvdata *drvdata; + struct msm_iommu_ctx_drvdata *ctx_drvdata = NULL; + int i, ret; + if (!c || !pdev->dev.parent) { + ret = -EINVAL; + goto fail; + } + + drvdata = dev_get_drvdata(pdev->dev.parent); + + if (!drvdata) { + ret = -ENODEV; + goto fail; + } + + ctx_drvdata = kzalloc(sizeof(*ctx_drvdata), GFP_KERNEL); + if (!ctx_drvdata) { + ret = -ENOMEM; + goto fail; + } + ctx_drvdata->num = c->num; + ctx_drvdata->pdev = pdev; + + INIT_LIST_HEAD(&ctx_drvdata->attached_elm); + platform_set_drvdata(pdev, ctx_drvdata); + + ret = clk_enable(drvdata->pclk); + if (ret) + goto fail; + + if (drvdata->clk) { + ret = clk_enable(drvdata->clk); + if (ret) { + clk_disable(drvdata->pclk); + goto fail; + } + } + + /* Program the M2V tables for this context */ + for (i = 0; i < MAX_NUM_MIDS; i++) { + int mid = c->mids[i]; + if (mid == -1) + break; + + SET_M2VCBR_N(drvdata->base, mid, 0); + SET_CBACR_N(drvdata->base, c->num, 0); + + /* Set VMID = 0 */ + SET_VMID(drvdata->base, mid, 0); + + /* Set the context number for that MID to this context */ + SET_CBNDX(drvdata->base, mid, c->num); + + /* Set MID associated with this context bank to 0*/ + SET_CBVMID(drvdata->base, c->num, 0); + + /* Set the ASID for TLB tagging for this context */ + SET_CONTEXTIDR_ASID(drvdata->base, c->num, c->num); + + /* Set security bit override to be Non-secure */ + SET_NSCFG(drvdata->base, mid, 3); + } + + if (drvdata->clk) + clk_disable(drvdata->clk); + clk_disable(drvdata->pclk); + + dev_info(&pdev->dev, "context %s using bank %d\n", c->name, c->num); + return 0; +fail: + kfree(ctx_drvdata); + return ret; +} + +static int msm_iommu_ctx_remove(struct platform_device *pdev) +{ + struct msm_iommu_ctx_drvdata *drv = NULL; + drv = platform_get_drvdata(pdev); + if (drv) { + memset(drv, 0, sizeof(struct msm_iommu_ctx_drvdata)); + kfree(drv); + platform_set_drvdata(pdev, NULL); + } + return 0; +} + +static struct platform_driver msm_iommu_driver = { + .driver = { + .name = "msm_iommu", + }, + .probe = msm_iommu_probe, + .remove = msm_iommu_remove, +}; + +static struct platform_driver msm_iommu_ctx_driver = { + .driver = { + .name = "msm_iommu_ctx", + }, + .probe = msm_iommu_ctx_probe, + .remove = msm_iommu_ctx_remove, +}; + +static int __init msm_iommu_driver_init(void) +{ + int ret; + ret = platform_driver_register(&msm_iommu_driver); + if (ret != 0) { + pr_err("Failed to register IOMMU driver\n"); + goto error; + } + + ret = platform_driver_register(&msm_iommu_ctx_driver); + if (ret != 0) { + pr_err("Failed to register IOMMU context driver\n"); + goto error; + } + +error: + return ret; +} + +static void __exit msm_iommu_driver_exit(void) +{ + platform_driver_unregister(&msm_iommu_ctx_driver); + platform_driver_unregister(&msm_iommu_driver); +} + +subsys_initcall(msm_iommu_driver_init); +module_exit(msm_iommu_driver_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Stepan Moskovchenko <stepanm@codeaurora.org>"); |