aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kernel/amd_iommu.c
diff options
context:
space:
mode:
authorOhad Ben-Cohen <ohad@wizery.com>2011-06-05 18:22:18 +0300
committerJoerg Roedel <joerg.roedel@amd.com>2011-06-21 10:49:29 +0200
commit29b68415e335ba9e0eb6057f9405aa4d9c23efe4 (patch)
tree76d1a8990ab1e5db5f6860262cb52c186d477925 /arch/x86/kernel/amd_iommu.c
parentb10f127e1a4d8cac5414c6e2b152c205b66c9f16 (diff)
x86: amd_iommu: move to drivers/iommu/
This should ease finding similarities with different platforms, with the intention of solving problems once in a generic framework which everyone can use. Compile-tested on x86_64. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
-rw-r--r--arch/x86/kernel/amd_iommu.c2764
1 files changed, 0 insertions, 2764 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
deleted file mode 100644
index 7c3a95e54ec..00000000000
--- a/arch/x86/kernel/amd_iommu.c
+++ /dev/null
@@ -1,2764 +0,0 @@
-/*
- * 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 <asm/proto.h>
-#include <asm/iommu.h>
-#include <asm/gart.h>
-#include <asm/dma.h>
-#include <asm/amd_iommu_proto.h>
-#include <asm/amd_iommu_types.h>
-#include <asm/amd_iommu.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);
-
-/*
- * 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 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;
- struct pci_dev *pdev;
- u16 devid, alias;
-
- if (dev->archdata.iommu)
- return 0;
-
- dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
- if (!dev_data)
- return -ENOMEM;
-
- dev_data->dev = dev;
-
- devid = get_device_id(dev);
- alias = amd_iommu_alias_table[devid];
- pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff);
- if (pdev)
- dev_data->alias = &pdev->dev;
- else {
- kfree(dev_data);
- return -ENOTSUPP;
- }
-
- atomic_set(&dev_data->bind, 0);
-
- 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)
-{
- kfree(dev->archdata.iommu);
-}
-
-void __init amd_iommu_uninit_devices(void)
-{
- struct pci_dev *pdev = NULL;
-
- for_each_pci_dev(pdev) {
-
- if (!check_device(&pdev->dev))
- continue;
-
- iommu_uninit_device(&pdev->dev);
- }
-}
-
-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 device *dev, u64 address, size_t size)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- struct amd_iommu *iommu;
- struct iommu_cmd cmd;
- u16 devid;
- int qdep;
-
- qdep = pci_ats_queue_depth(pdev);
- devid = get_device_id(dev);
- iommu = amd_iommu_rlookup_table[devid];
-
- build_inv_iotlb_pages(&cmd, 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 device *dev)
-{
- struct amd_iommu *iommu;
- struct pci_dev *pdev;
- u16 devid;
- int ret;
-
- pdev = to_pci_dev(dev);
- devid = get_device_id(dev);
- iommu = amd_iommu_rlookup_table[devid];
-
- ret = iommu_flush_dte(iommu, devid);
- if (ret)
- return ret;
-
- if (pci_ats_enabled(pdev))
- ret = device_flush_iotlb(dev, 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) {
- struct pci_dev *pdev = to_pci_dev(dev_data->dev);
-
- if (!pci_ats_enabled(pdev))
- continue;
-
- ret |= device_flush_iotlb(dev_data->dev, 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->dev);
-
- 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 device *dev, struct protection_domain *domain)
-{
- struct iommu_dev_data *dev_data;
- struct amd_iommu *iommu;
- struct pci_dev *pdev;
- bool ats = false;
- u16 devid;
-
- devid = get_device_id(dev);
- iommu = amd_iommu_rlookup_table[devid];
- dev_data = get_dev_data(dev);
- pdev = to_pci_dev(dev);
-
- if (amd_iommu_iotlb_sup)
- ats = pci_ats_enabled(pdev);
-
- /* Update data structures */
- dev_data->domain = domain;
- list_add(&dev_data->list, &domain->dev_list);
- set_dte_entry(devid, domain, ats);
-
- /* Do reference counting */
- domain->dev_iommu[iommu->index] += 1;
- domain->dev_cnt += 1;
-
- /* Flush the DTE entry */
- device_flush_dte(dev);
-}
-
-static void do_detach(struct device *dev)
-{
- struct iommu_dev_data *dev_data;
- struct amd_iommu *iommu;
- u16 devid;
-
- devid = get_device_id(dev);
- iommu = amd_iommu_rlookup_table[devid];
- dev_data = get_dev_data(dev);
-
- /* 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(devid);
-
- /* Flush the DTE entry */
- device_flush_dte(dev);
-}
-
-/*
- * 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 iommu_dev_data *dev_data, *alias_data;
- int ret;
-
- dev_data = get_dev_data(dev);
- alias_data = get_dev_data(dev_data->alias);
-
- if (!alias_data)
- return -EINVAL;
-
- /* lock domain */
- spin_lock(&domain->lock);
-
- /* 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 (dev_data->alias != dev) {
- alias_data = get_dev_data(dev_data->alias);
- if (alias_data->domain == NULL)
- do_attach(dev_data->alias, domain);
-
- atomic_inc(&alias_data->bind);
- }
-
- if (dev_data->domain == NULL)
- do_attach(dev, 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);
- unsigned long flags;
- int ret;
-
- if (amd_iommu_iotlb_sup)
- pci_enable_ats(pdev, PAGE_SHIFT);
-
- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
- ret = __attach_device(dev, 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 device *dev)
-{
- struct iommu_dev_data *dev_data = get_dev_data(dev);
- struct iommu_dev_data *alias_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 != dev) {
- alias_data = get_dev_data(dev_data->alias);
- if (atomic_dec_and_test(&alias_data->bind))
- do_detach(dev_data->alias);
- }
-
- if (atomic_dec_and_test(&dev_data->bind))
- do_detach(dev);
-
- 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, pt_domain);
-}
-
-/*
- * Removes a device from a protection domain (with devtable_lock held)
- */
-static void detach_device(struct device *dev)
-{
- struct pci_dev *pdev = to_pci_dev(dev);
- unsigned long flags;
-
- /* lock device table */
- write_lock_irqsave(&amd_iommu_devtable_lock, flags);
- __detach_device(dev);
- write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
-
- if (amd_iommu_iotlb_sup && pci_ats_enabled(pdev))
- pci_disable_ats(pdev);
-}
-
-/*
- * 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 protection_domain *dom;
- struct iommu_dev_data *dev_data, *alias_data;
- unsigned long flags;
- u16 devid;
-
- devid = get_device_id(dev);
- dev_data = get_dev_data(dev);
- alias_data = get_dev_data(dev_data->alias);
- if (!alias_data)
- return NULL;
-
- read_lock_irqsave(&amd_iommu_devtable_lock, flags);
- dom = dev_data->domain;
- if (dom == NULL &&
- alias_data->domain != NULL) {
- __attach_device(dev, 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;
- }
-
- device_flush_dte(dev);
- 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) {
- struct pci_dev *pdev = to_pci_dev(dev_data->dev);
- u16 devid = get_device_id(dev_data->dev);
- set_dte_entry(devid, domain, pci_ats_enabled(pdev));
- }
-}
-
-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) {
- struct device *dev = dev_data->dev;
-
- __detach_device(dev);
- 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;
-
- device_flush_dte(dev);
- 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;
- u16 devid;
-
- if (!check_device(dev))
- return -EINVAL;
-
- dev_data = dev->archdata.iommu;
-
- devid = get_device_id(dev);
-
- iommu = amd_iommu_rlookup_table[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;
-}