--- /dev/null
+/*
+ * Copyright (C) 2010-2012 Advanced Micro Devices, Inc.
+ * Author: Joerg Roedel <jroedel@suse.de>
+ *
+ * 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/mmu_notifier.h>
+#include <linux/amd-iommu.h>
+#include <linux/mm_types.h>
+#include <linux/profile.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/iommu.h>
+#include <linux/wait.h>
+#include <linux/pci.h>
+#include <linux/gfp.h>
+
+#include "amd_iommu_types.h"
+#include "amd_iommu_proto.h"
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Joerg Roedel <jroedel@suse.de>");
+
+#define MAX_DEVICES 0x10000
+#define PRI_QUEUE_SIZE 512
+
+struct pri_queue {
+ atomic_t inflight;
+ bool finish;
+ int status;
+};
+
+struct pasid_state {
+ struct list_head list; /* For global state-list */
+ atomic_t count; /* Reference count */
+ unsigned mmu_notifier_count; /* Counting nested mmu_notifier
+ calls */
+ struct mm_struct *mm; /* mm_struct for the faults */
+ struct mmu_notifier mn; /* mmu_notifier handle */
+ struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */
+ struct device_state *device_state; /* Link to our device_state */
+ int pasid; /* PASID index */
+ bool invalid; /* Used during setup and
+ teardown of the pasid */
+ spinlock_t lock; /* Protect pri_queues and
+ mmu_notifer_count */
+ wait_queue_head_t wq; /* To wait for count == 0 */
+};
+
+struct device_state {
+ struct list_head list;
+ u16 devid;
+ atomic_t count;
+ struct pci_dev *pdev;
+ struct pasid_state **states;
+ struct iommu_domain *domain;
+ int pasid_levels;
+ int max_pasids;
+ amd_iommu_invalid_ppr_cb inv_ppr_cb;
+ amd_iommu_invalidate_ctx inv_ctx_cb;
+ spinlock_t lock;
+ wait_queue_head_t wq;
+};
+
+struct fault {
+ struct work_struct work;
+ struct device_state *dev_state;
+ struct pasid_state *state;
+ struct mm_struct *mm;
+ u64 address;
+ u16 devid;
+ u16 pasid;
+ u16 tag;
+ u16 finish;
+ u16 flags;
+};
+
+static LIST_HEAD(state_list);
+static spinlock_t state_lock;
+
+static struct workqueue_struct *iommu_wq;
+
+static void free_pasid_states(struct device_state *dev_state);
+
+static u16 device_id(struct pci_dev *pdev)
+{
+ u16 devid;
+
+ devid = pdev->bus->number;
+ devid = (devid << 8) | pdev->devfn;
+
+ return devid;
+}
+
+static struct device_state *__get_device_state(u16 devid)
+{
+ struct device_state *dev_state;
+
+ list_for_each_entry(dev_state, &state_list, list) {
+ if (dev_state->devid == devid)
+ return dev_state;
+ }
+
+ return NULL;
+}
+
+static struct device_state *get_device_state(u16 devid)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+
+ spin_lock_irqsave(&state_lock, flags);
+ dev_state = __get_device_state(devid);
+ if (dev_state != NULL)
+ atomic_inc(&dev_state->count);
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ return dev_state;
+}
+
+static void free_device_state(struct device_state *dev_state)
+{
+ /*
+ * First detach device from domain - No more PRI requests will arrive
+ * from that device after it is unbound from the IOMMUv2 domain.
+ */
+ iommu_detach_device(dev_state->domain, &dev_state->pdev->dev);
+
+ /* Everything is down now, free the IOMMUv2 domain */
+ iommu_domain_free(dev_state->domain);
+
+ /* Finally get rid of the device-state */
+ kfree(dev_state);
+}
+
+static void put_device_state(struct device_state *dev_state)
+{
+ if (atomic_dec_and_test(&dev_state->count))
+ wake_up(&dev_state->wq);
+}
+
+/* Must be called under dev_state->lock */
+static struct pasid_state **__get_pasid_state_ptr(struct device_state *dev_state,
+ int pasid, bool alloc)
+{
+ struct pasid_state **root, **ptr;
+ int level, index;
+
+ level = dev_state->pasid_levels;
+ root = dev_state->states;
+
+ while (true) {
+
+ index = (pasid >> (9 * level)) & 0x1ff;
+ ptr = &root[index];
+
+ if (level == 0)
+ break;
+
+ if (*ptr == NULL) {
+ if (!alloc)
+ return NULL;
+
+ *ptr = (void *)get_zeroed_page(GFP_ATOMIC);
+ if (*ptr == NULL)
+ return NULL;
+ }
+
+ root = (struct pasid_state **)*ptr;
+ level -= 1;
+ }
+
+ return ptr;
+}
+
+static int set_pasid_state(struct device_state *dev_state,
+ struct pasid_state *pasid_state,
+ int pasid)
+{
+ struct pasid_state **ptr;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&dev_state->lock, flags);
+ ptr = __get_pasid_state_ptr(dev_state, pasid, true);
+
+ ret = -ENOMEM;
+ if (ptr == NULL)
+ goto out_unlock;
+
+ ret = -ENOMEM;
+ if (*ptr != NULL)
+ goto out_unlock;
+
+ *ptr = pasid_state;
+
+ ret = 0;
+
+out_unlock:
+ spin_unlock_irqrestore(&dev_state->lock, flags);
+
+ return ret;
+}
+
+static void clear_pasid_state(struct device_state *dev_state, int pasid)
+{
+ struct pasid_state **ptr;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev_state->lock, flags);
+ ptr = __get_pasid_state_ptr(dev_state, pasid, true);
+
+ if (ptr == NULL)
+ goto out_unlock;
+
+ *ptr = NULL;
+
+out_unlock:
+ spin_unlock_irqrestore(&dev_state->lock, flags);
+}
+
+static struct pasid_state *get_pasid_state(struct device_state *dev_state,
+ int pasid)
+{
+ struct pasid_state **ptr, *ret = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev_state->lock, flags);
+ ptr = __get_pasid_state_ptr(dev_state, pasid, false);
+
+ if (ptr == NULL)
+ goto out_unlock;
+
+ ret = *ptr;
+ if (ret)
+ atomic_inc(&ret->count);
+
+out_unlock:
+ spin_unlock_irqrestore(&dev_state->lock, flags);
+
+ return ret;
+}
+
+static void free_pasid_state(struct pasid_state *pasid_state)
+{
+ kfree(pasid_state);
+}
+
+static void put_pasid_state(struct pasid_state *pasid_state)
+{
+ if (atomic_dec_and_test(&pasid_state->count))
+ wake_up(&pasid_state->wq);
+}
+
+static void put_pasid_state_wait(struct pasid_state *pasid_state)
+{
+ atomic_dec(&pasid_state->count);
+ wait_event(pasid_state->wq, !atomic_read(&pasid_state->count));
+ free_pasid_state(pasid_state);
+}
+
+static void unbind_pasid(struct pasid_state *pasid_state)
+{
+ struct iommu_domain *domain;
+
+ domain = pasid_state->device_state->domain;
+
+ /*
+ * Mark pasid_state as invalid, no more faults will we added to the
+ * work queue after this is visible everywhere.
+ */
+ pasid_state->invalid = true;
+
+ /* Make sure this is visible */
+ smp_wmb();
+
+ /* After this the device/pasid can't access the mm anymore */
+ amd_iommu_domain_clear_gcr3(domain, pasid_state->pasid);
+
+ /* Make sure no more pending faults are in the queue */
+ flush_workqueue(iommu_wq);
+}
+
+static void free_pasid_states_level1(struct pasid_state **tbl)
+{
+ int i;
+
+ for (i = 0; i < 512; ++i) {
+ if (tbl[i] == NULL)
+ continue;
+
+ free_page((unsigned long)tbl[i]);
+ }
+}
+
+static void free_pasid_states_level2(struct pasid_state **tbl)
+{
+ struct pasid_state **ptr;
+ int i;
+
+ for (i = 0; i < 512; ++i) {
+ if (tbl[i] == NULL)
+ continue;
+
+ ptr = (struct pasid_state **)tbl[i];
+ free_pasid_states_level1(ptr);
+ }
+}
+
+static void free_pasid_states(struct device_state *dev_state)
+{
+ struct pasid_state *pasid_state;
+ int i;
+
+ for (i = 0; i < dev_state->max_pasids; ++i) {
+ pasid_state = get_pasid_state(dev_state, i);
+ if (pasid_state == NULL)
+ continue;
+
+ put_pasid_state(pasid_state);
+
+ /*
+ * This will call the mn_release function and
+ * unbind the PASID
+ */
+ mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
+
+ put_pasid_state_wait(pasid_state); /* Reference taken in
+ amd_iommu_bind_pasid */
+
+ /* Drop reference taken in amd_iommu_bind_pasid */
+ put_device_state(dev_state);
+ }
+
+ if (dev_state->pasid_levels == 2)
+ free_pasid_states_level2(dev_state->states);
+ else if (dev_state->pasid_levels == 1)
+ free_pasid_states_level1(dev_state->states);
+ else if (dev_state->pasid_levels != 0)
+ BUG();
+
+ free_page((unsigned long)dev_state->states);
+}
+
+static struct pasid_state *mn_to_state(struct mmu_notifier *mn)
+{
+ return container_of(mn, struct pasid_state, mn);
+}
+
+static void __mn_flush_page(struct mmu_notifier *mn,
+ unsigned long address)
+{
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+
+ pasid_state = mn_to_state(mn);
+ dev_state = pasid_state->device_state;
+
+ amd_iommu_flush_page(dev_state->domain, pasid_state->pasid, address);
+}
+
+static int mn_clear_flush_young(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start,
+ unsigned long end)
+{
+ for (; start < end; start += PAGE_SIZE)
+ __mn_flush_page(mn, start);
+
+ return 0;
+}
+
+static void mn_invalidate_page(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long address)
+{
+ __mn_flush_page(mn, address);
+}
+
+static void mn_invalidate_range(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+
+ pasid_state = mn_to_state(mn);
+ dev_state = pasid_state->device_state;
+
+ if ((start ^ (end - 1)) < PAGE_SIZE)
+ amd_iommu_flush_page(dev_state->domain, pasid_state->pasid,
+ start);
+ else
+ amd_iommu_flush_tlb(dev_state->domain, pasid_state->pasid);
+}
+
+static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
+{
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+ bool run_inv_ctx_cb;
+
+ might_sleep();
+
+ pasid_state = mn_to_state(mn);
+ dev_state = pasid_state->device_state;
+ run_inv_ctx_cb = !pasid_state->invalid;
+
+ if (run_inv_ctx_cb && dev_state->inv_ctx_cb)
+ dev_state->inv_ctx_cb(dev_state->pdev, pasid_state->pasid);
+
+ unbind_pasid(pasid_state);
+}
+
+static struct mmu_notifier_ops iommu_mn = {
+ .release = mn_release,
+ .clear_flush_young = mn_clear_flush_young,
+ .invalidate_page = mn_invalidate_page,
+ .invalidate_range = mn_invalidate_range,
+};
+
+static void set_pri_tag_status(struct pasid_state *pasid_state,
+ u16 tag, int status)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pasid_state->lock, flags);
+ pasid_state->pri[tag].status = status;
+ spin_unlock_irqrestore(&pasid_state->lock, flags);
+}
+
+static void finish_pri_tag(struct device_state *dev_state,
+ struct pasid_state *pasid_state,
+ u16 tag)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&pasid_state->lock, flags);
+ if (atomic_dec_and_test(&pasid_state->pri[tag].inflight) &&
+ pasid_state->pri[tag].finish) {
+ amd_iommu_complete_ppr(dev_state->pdev, pasid_state->pasid,
+ pasid_state->pri[tag].status, tag);
+ pasid_state->pri[tag].finish = false;
+ pasid_state->pri[tag].status = PPR_SUCCESS;
+ }
+ spin_unlock_irqrestore(&pasid_state->lock, flags);
+}
+
+static void handle_fault_error(struct fault *fault)
+{
+ int status;
+
+ if (!fault->dev_state->inv_ppr_cb) {
+ set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
+ return;
+ }
+
+ status = fault->dev_state->inv_ppr_cb(fault->dev_state->pdev,
+ fault->pasid,
+ fault->address,
+ fault->flags);
+ switch (status) {
+ case AMD_IOMMU_INV_PRI_RSP_SUCCESS:
+ set_pri_tag_status(fault->state, fault->tag, PPR_SUCCESS);
+ break;
+ case AMD_IOMMU_INV_PRI_RSP_INVALID:
+ set_pri_tag_status(fault->state, fault->tag, PPR_INVALID);
+ break;
+ case AMD_IOMMU_INV_PRI_RSP_FAIL:
+ set_pri_tag_status(fault->state, fault->tag, PPR_FAILURE);
+ break;
+ default:
+ BUG();
+ }
+}
+
+static void do_fault(struct work_struct *work)
+{
+ struct fault *fault = container_of(work, struct fault, work);
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
+ u64 address;
+ int ret, write;
+
+ write = !!(fault->flags & PPR_FAULT_WRITE);
+
+ mm = fault->state->mm;
+ address = fault->address;
+
+ down_read(&mm->mmap_sem);
+ vma = find_extend_vma(mm, address);
+ if (!vma || address < vma->vm_start) {
+ /* failed to get a vma in the right range */
+ up_read(&mm->mmap_sem);
+ handle_fault_error(fault);
+ goto out;
+ }
+
+ ret = handle_mm_fault(mm, vma, address, write);
+ if (ret & VM_FAULT_ERROR) {
+ /* failed to service fault */
+ up_read(&mm->mmap_sem);
+ handle_fault_error(fault);
+ goto out;
+ }
+
+ up_read(&mm->mmap_sem);
+
+out:
+ finish_pri_tag(fault->dev_state, fault->state, fault->tag);
+
+ put_pasid_state(fault->state);
+
+ kfree(fault);
+}
+
+static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
+{
+ struct amd_iommu_fault *iommu_fault;
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+ unsigned long flags;
+ struct fault *fault;
+ bool finish;
+ u16 tag;
+ int ret;
+
+ iommu_fault = data;
+ tag = iommu_fault->tag & 0x1ff;
+ finish = (iommu_fault->tag >> 9) & 1;
+
+ ret = NOTIFY_DONE;
+ dev_state = get_device_state(iommu_fault->device_id);
+ if (dev_state == NULL)
+ goto out;
+
+ pasid_state = get_pasid_state(dev_state, iommu_fault->pasid);
+ if (pasid_state == NULL || pasid_state->invalid) {
+ /* We know the device but not the PASID -> send INVALID */
+ amd_iommu_complete_ppr(dev_state->pdev, iommu_fault->pasid,
+ PPR_INVALID, tag);
+ goto out_drop_state;
+ }
+
+ spin_lock_irqsave(&pasid_state->lock, flags);
+ atomic_inc(&pasid_state->pri[tag].inflight);
+ if (finish)
+ pasid_state->pri[tag].finish = true;
+ spin_unlock_irqrestore(&pasid_state->lock, flags);
+
+ fault = kzalloc(sizeof(*fault), GFP_ATOMIC);
+ if (fault == NULL) {
+ /* We are OOM - send success and let the device re-fault */
+ finish_pri_tag(dev_state, pasid_state, tag);
+ goto out_drop_state;
+ }
+
+ fault->dev_state = dev_state;
+ fault->address = iommu_fault->address;
+ fault->state = pasid_state;
+ fault->tag = tag;
+ fault->finish = finish;
+ fault->pasid = iommu_fault->pasid;
+ fault->flags = iommu_fault->flags;
+ INIT_WORK(&fault->work, do_fault);
+
+ queue_work(iommu_wq, &fault->work);
+
+ ret = NOTIFY_OK;
+
+out_drop_state:
+
+ if (ret != NOTIFY_OK && pasid_state)
+ put_pasid_state(pasid_state);
+
+ put_device_state(dev_state);
+
+out:
+ return ret;
+}
+
+static struct notifier_block ppr_nb = {
+ .notifier_call = ppr_notifier,
+};
+
+int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
+ struct task_struct *task)
+{
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+ struct mm_struct *mm;
+ u16 devid;
+ int ret;
+
+ might_sleep();
+
+ if (!amd_iommu_v2_supported())
+ return -ENODEV;
+
+ devid = device_id(pdev);
+ dev_state = get_device_state(devid);
+
+ if (dev_state == NULL)
+ return -EINVAL;
+
+ ret = -EINVAL;
+ if (pasid < 0 || pasid >= dev_state->max_pasids)
+ goto out;
+
+ ret = -ENOMEM;
+ pasid_state = kzalloc(sizeof(*pasid_state), GFP_KERNEL);
+ if (pasid_state == NULL)
+ goto out;
+
+
+ atomic_set(&pasid_state->count, 1);
+ init_waitqueue_head(&pasid_state->wq);
+ spin_lock_init(&pasid_state->lock);
+
+ mm = get_task_mm(task);
+ pasid_state->mm = mm;
+ pasid_state->device_state = dev_state;
+ pasid_state->pasid = pasid;
+ pasid_state->invalid = true; /* Mark as valid only if we are
+ done with setting up the pasid */
+ pasid_state->mn.ops = &iommu_mn;
+
+ if (pasid_state->mm == NULL)
+ goto out_free;
+
+ mmu_notifier_register(&pasid_state->mn, mm);
+
+ ret = set_pasid_state(dev_state, pasid_state, pasid);
+ if (ret)
+ goto out_unregister;
+
+ ret = amd_iommu_domain_set_gcr3(dev_state->domain, pasid,
+ __pa(pasid_state->mm->pgd));
+ if (ret)
+ goto out_clear_state;
+
+ /* Now we are ready to handle faults */
+ pasid_state->invalid = false;
+
+ /*
+ * Drop the reference to the mm_struct here. We rely on the
+ * mmu_notifier release call-back to inform us when the mm
+ * is going away.
+ */
+ mmput(mm);
+
+ return 0;
+
+out_clear_state:
+ clear_pasid_state(dev_state, pasid);
+
+out_unregister:
+ mmu_notifier_unregister(&pasid_state->mn, mm);
+
+out_free:
+ mmput(mm);
+ free_pasid_state(pasid_state);
+
+out:
+ put_device_state(dev_state);
+
+ return ret;
+}
+EXPORT_SYMBOL(amd_iommu_bind_pasid);
+
+void amd_iommu_unbind_pasid(struct pci_dev *pdev, int pasid)
+{
+ struct pasid_state *pasid_state;
+ struct device_state *dev_state;
+ u16 devid;
+
+ might_sleep();
+
+ if (!amd_iommu_v2_supported())
+ return;
+
+ devid = device_id(pdev);
+ dev_state = get_device_state(devid);
+ if (dev_state == NULL)
+ return;
+
+ if (pasid < 0 || pasid >= dev_state->max_pasids)
+ goto out;
+
+ pasid_state = get_pasid_state(dev_state, pasid);
+ if (pasid_state == NULL)
+ goto out;
+ /*
+ * Drop reference taken here. We are safe because we still hold
+ * the reference taken in the amd_iommu_bind_pasid function.
+ */
+ put_pasid_state(pasid_state);
+
+ /* Clear the pasid state so that the pasid can be re-used */
+ clear_pasid_state(dev_state, pasid_state->pasid);
+
+ /*
+ * Call mmu_notifier_unregister to drop our reference
+ * to pasid_state->mm
+ */
+ mmu_notifier_unregister(&pasid_state->mn, pasid_state->mm);
+
+ put_pasid_state_wait(pasid_state); /* Reference taken in
+ amd_iommu_bind_pasid */
+out:
+ /* Drop reference taken in this function */
+ put_device_state(dev_state);
+
+ /* Drop reference taken in amd_iommu_bind_pasid */
+ put_device_state(dev_state);
+}
+EXPORT_SYMBOL(amd_iommu_unbind_pasid);
+
+int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+ int ret, tmp;
+ u16 devid;
+
+ might_sleep();
+
+ if (!amd_iommu_v2_supported())
+ return -ENODEV;
+
+ if (pasids <= 0 || pasids > (PASID_MASK + 1))
+ return -EINVAL;
+
+ devid = device_id(pdev);
+
+ dev_state = kzalloc(sizeof(*dev_state), GFP_KERNEL);
+ if (dev_state == NULL)
+ return -ENOMEM;
+
+ spin_lock_init(&dev_state->lock);
+ init_waitqueue_head(&dev_state->wq);
+ dev_state->pdev = pdev;
+ dev_state->devid = devid;
+
+ tmp = pasids;
+ for (dev_state->pasid_levels = 0; (tmp - 1) & ~0x1ff; tmp >>= 9)
+ dev_state->pasid_levels += 1;
+
+ atomic_set(&dev_state->count, 1);
+ dev_state->max_pasids = pasids;
+
+ ret = -ENOMEM;
+ dev_state->states = (void *)get_zeroed_page(GFP_KERNEL);
+ if (dev_state->states == NULL)
+ goto out_free_dev_state;
+
+ dev_state->domain = iommu_domain_alloc(&pci_bus_type);
+ if (dev_state->domain == NULL)
+ goto out_free_states;
+
+ amd_iommu_domain_direct_map(dev_state->domain);
+
+ ret = amd_iommu_domain_enable_v2(dev_state->domain, pasids);
+ if (ret)
+ goto out_free_domain;
+
+ ret = iommu_attach_device(dev_state->domain, &pdev->dev);
+ if (ret != 0)
+ goto out_free_domain;
+
+ spin_lock_irqsave(&state_lock, flags);
+
+ if (__get_device_state(devid) != NULL) {
+ spin_unlock_irqrestore(&state_lock, flags);
+ ret = -EBUSY;
+ goto out_free_domain;
+ }
+
+ list_add_tail(&dev_state->list, &state_list);
+
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ return 0;
+
+out_free_domain:
+ iommu_domain_free(dev_state->domain);
+
+out_free_states:
+ free_page((unsigned long)dev_state->states);
+
+out_free_dev_state:
+ kfree(dev_state);
+
+ return ret;
+}
+EXPORT_SYMBOL(amd_iommu_init_device);
+
+void amd_iommu_free_device(struct pci_dev *pdev)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+ u16 devid;
+
+ if (!amd_iommu_v2_supported())
+ return;
+
+ devid = device_id(pdev);
+
+ spin_lock_irqsave(&state_lock, flags);
+
+ dev_state = __get_device_state(devid);
+ if (dev_state == NULL) {
+ spin_unlock_irqrestore(&state_lock, flags);
+ return;
+ }
+
+ list_del(&dev_state->list);
+
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ /* Get rid of any remaining pasid states */
+ free_pasid_states(dev_state);
+
+ put_device_state(dev_state);
+ /*
+ * Wait until the last reference is dropped before freeing
+ * the device state.
+ */
+ wait_event(dev_state->wq, !atomic_read(&dev_state->count));
+ free_device_state(dev_state);
+}
+EXPORT_SYMBOL(amd_iommu_free_device);
+
+int amd_iommu_set_invalid_ppr_cb(struct pci_dev *pdev,
+ amd_iommu_invalid_ppr_cb cb)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+ u16 devid;
+ int ret;
+
+ if (!amd_iommu_v2_supported())
+ return -ENODEV;
+
+ devid = device_id(pdev);
+
+ spin_lock_irqsave(&state_lock, flags);
+
+ ret = -EINVAL;
+ dev_state = __get_device_state(devid);
+ if (dev_state == NULL)
+ goto out_unlock;
+
+ dev_state->inv_ppr_cb = cb;
+
+ ret = 0;
+
+out_unlock:
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(amd_iommu_set_invalid_ppr_cb);
+
+int amd_iommu_set_invalidate_ctx_cb(struct pci_dev *pdev,
+ amd_iommu_invalidate_ctx cb)
+{
+ struct device_state *dev_state;
+ unsigned long flags;
+ u16 devid;
+ int ret;
+
+ if (!amd_iommu_v2_supported())
+ return -ENODEV;
+
+ devid = device_id(pdev);
+
+ spin_lock_irqsave(&state_lock, flags);
+
+ ret = -EINVAL;
+ dev_state = __get_device_state(devid);
+ if (dev_state == NULL)
+ goto out_unlock;
+
+ dev_state->inv_ctx_cb = cb;
+
+ ret = 0;
+
+out_unlock:
+ spin_unlock_irqrestore(&state_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(amd_iommu_set_invalidate_ctx_cb);
+
+static int __init amd_iommu_v2_init(void)
+{
+ int ret;
+
+ pr_info("AMD IOMMUv2 driver by Joerg Roedel <jroedel@suse.de>\n");
+
+ if (!amd_iommu_v2_supported()) {
+ pr_info("AMD IOMMUv2 functionality not available on this system\n");
+ /*
+ * Load anyway to provide the symbols to other modules
+ * which may use AMD IOMMUv2 optionally.
+ */
+ return 0;
+ }
+
+ spin_lock_init(&state_lock);
+
+ ret = -ENOMEM;
+ iommu_wq = create_workqueue("amd_iommu_v2");
+ if (iommu_wq == NULL)
+ goto out;
+
+ amd_iommu_register_ppr_notifier(&ppr_nb);
+
+ return 0;
+
+out:
+ return ret;
+}
+
+static void __exit amd_iommu_v2_exit(void)
+{
+ struct device_state *dev_state;
+ int i;
+
+ if (!amd_iommu_v2_supported())
+ return;
+
+ amd_iommu_unregister_ppr_notifier(&ppr_nb);
+
+ flush_workqueue(iommu_wq);
+
+ /*
+ * The loop below might call flush_workqueue(), so call
+ * destroy_workqueue() after it
+ */
+ for (i = 0; i < MAX_DEVICES; ++i) {
+ dev_state = get_device_state(i);
+
+ if (dev_state == NULL)
+ continue;
+
+ WARN_ON_ONCE(1);
+
+ put_device_state(dev_state);
+ amd_iommu_free_device(dev_state->pdev);
+ }
+
+ destroy_workqueue(iommu_wq);
+}
+
+module_init(amd_iommu_v2_init);
+module_exit(amd_iommu_v2_exit);
Code Review / kvmfornfv.git / blobdiff