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iommu/amd: Handle parallel invalidate_range_start/end calls correctly

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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>
This commit is contained in:
Joerg Roedel 2014-05-20 23:18:26 +02:00
parent 9163b90135
commit e79df31c60
1 changed files with 13 additions and 4 deletions
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17
drivers/iommu/amd_iommu_v2.c
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@ -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);