iommu/amd: Handle parallel invalidate_range_start/end calls correctly

Add a counter to the pasid_state so that we do not restore
the original page-table before all invalidate_range_start
to invalidate_range_end sections have finished.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 13 insertions, 4 deletions

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index c65f3ec60bec..d4daa05efe60 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -45,6 +45,8 @@ struct pri_queue {
 struct pasid_state {
         struct list_head list;                  /* For global state-list */
         atomic_t count;                         /* Reference count */
+        atomic_t mmu_notifier_count;            /* Counting nested mmu_notifier
+                                                   calls */
         struct task_struct *task;               /* Task bound to this PASID */
         struct mm_struct *mm;                   /* mm_struct for the faults */
         struct mmu_notifier mn;                 /* mmu_otifier handle */
@@ -433,8 +435,11 @@ static void mn_invalidate_range_start(struct mmu_notifier *mn,
         pasid_state = mn_to_state(mn);
         dev_state   = pasid_state->device_state;
 
-        amd_iommu_domain_set_gcr3(dev_state->domain, pasid_state->pasid,
-                                  __pa(empty_page_table));
+        if (atomic_add_return(1, &pasid_state->mmu_notifier_count) == 1) {
+                amd_iommu_domain_set_gcr3(dev_state->domain,
+                                          pasid_state->pasid,
+                                          __pa(empty_page_table));
+        }
 }
 
 static void mn_invalidate_range_end(struct mmu_notifier *mn,
@@ -447,8 +452,11 @@ static void mn_invalidate_range_end(struct mmu_notifier *mn,
         pasid_state = mn_to_state(mn);
         dev_state   = pasid_state->device_state;
 
-        amd_iommu_domain_set_gcr3(dev_state->domain, pasid_state->pasid,
-                                  __pa(pasid_state->mm->pgd));
+        if (atomic_dec_and_test(&pasid_state->mmu_notifier_count)) {
+                amd_iommu_domain_set_gcr3(dev_state->domain,
+                                          pasid_state->pasid,
+                                          __pa(pasid_state->mm->pgd));
+        }
 }
 
 static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm)
@@ -642,6 +650,7 @@ int amd_iommu_bind_pasid(struct pci_dev *pdev, int pasid,
                 goto out;
 
         atomic_set(&pasid_state->count, 1);
+        atomic_set(&pasid_state->mmu_notifier_count, 0);
         init_waitqueue_head(&pasid_state->wq);
         spin_lock_init(&pasid_state->lock);