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-rw-r--r--drivers/iommu/amd_iommu.c2824
1 files changed, 2824 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
new file mode 100644
index 00000000000..a14f8dc2346
--- /dev/null
+++ b/drivers/iommu/amd_iommu.c
@@ -0,0 +1,2824 @@
+/*
+ * 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/msidef.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, old_size;
+
+#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;
+ }
+ }
+
+ old_size = dma_dom->aperture_size;
+ dma_dom->aperture_size += APERTURE_RANGE_SIZE;
+
+ /* Reserve address range used for MSI messages */
+ if (old_size < MSI_ADDR_BASE_LO &&
+ dma_dom->aperture_size > MSI_ADDR_BASE_LO) {
+ unsigned long spage;
+ int pages;
+
+ pages = iommu_num_pages(MSI_ADDR_BASE_LO, 0x10000, PAGE_SIZE);
+ spage = MSI_ADDR_BASE_LO >> PAGE_SHIFT;
+
+ dma_ops_reserve_addresses(dma_dom, spage, pages);
+ }
+
+ /* 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;
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-23 12:52:07 +0000