diff options
Diffstat (limited to 'drivers/iommu/amd_iommu_v2.c')
| -rw-r--r-- | drivers/iommu/amd_iommu_v2.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c index d4daa05efe60..499b4366a98d 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -45,7 +45,7 @@ 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 + unsigned 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 */ @@ -53,7 +53,8 @@ struct pasid_state { struct pri_queue pri[PRI_QUEUE_SIZE]; /* PRI tag states */ struct device_state *device_state; /* Link to our device_state */ int pasid; /* PASID index */ - spinlock_t lock; /* Protect pri_queues */ + spinlock_t lock; /* Protect pri_queues and + mmu_notifer_count */ wait_queue_head_t wq; /* To wait for count == 0 */ }; @@ -431,15 +432,19 @@ static void mn_invalidate_range_start(struct mmu_notifier *mn, { struct pasid_state *pasid_state; struct device_state *dev_state; + unsigned long flags; pasid_state = mn_to_state(mn); dev_state = pasid_state->device_state; - if (atomic_add_return(1, &pasid_state->mmu_notifier_count) == 1) { + spin_lock_irqsave(&pasid_state->lock, flags); + if (pasid_state->mmu_notifier_count == 0) { amd_iommu_domain_set_gcr3(dev_state->domain, pasid_state->pasid, __pa(empty_page_table)); } + pasid_state->mmu_notifier_count += 1; + spin_unlock_irqrestore(&pasid_state->lock, flags); } static void mn_invalidate_range_end(struct mmu_notifier *mn, @@ -448,15 +453,19 @@ static void mn_invalidate_range_end(struct mmu_notifier *mn, { struct pasid_state *pasid_state; struct device_state *dev_state; + unsigned long flags; pasid_state = mn_to_state(mn); dev_state = pasid_state->device_state; - if (atomic_dec_and_test(&pasid_state->mmu_notifier_count)) { + spin_lock_irqsave(&pasid_state->lock, flags); + pasid_state->mmu_notifier_count -= 1; + if (pasid_state->mmu_notifier_count == 0) { amd_iommu_domain_set_gcr3(dev_state->domain, pasid_state->pasid, __pa(pasid_state->mm->pgd)); } + spin_unlock_irqrestore(&pasid_state->lock, flags); } static void mn_release(struct mmu_notifier *mn, struct mm_struct *mm) @@ -650,7 +659,6 @@ 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); |