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drm/amdgpu: Revert "remove the userptr rmn->lock"

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This reverts commit c02196834456f2d5fad334088b70e98ce4967c34.

In the meantime we moved get_user_pages() outside of the reservation lock,
so that shouldn't be an issue any more

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-03-18 19:29:51 +01:00 committed by Alex Deucher
parent 0ccbf11988
commit 0d2b42b0bd
1 changed files with 14 additions and 8 deletions
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22
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
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@ -48,7 +48,8 @@ struct amdgpu_mn {
/* protected by adev->mn_lock */
struct hlist_node node;
/* objects protected by mm->mmap_sem */
/* objects protected by lock */
struct mutex lock;
struct rb_root objects;
};
@ -72,7 +73,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
struct amdgpu_bo *bo, *next_bo;
mutex_lock(&adev->mn_lock);
down_write(&rmn->mm->mmap_sem);
mutex_lock(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
it.rb) {
@ -82,7 +83,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
}
kfree(node);
}
up_write(&rmn->mm->mmap_sem);
mutex_unlock(&rmn->lock);
mutex_unlock(&adev->mn_lock);
mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
kfree(rmn);
@ -126,6 +127,8 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
/* notification is exclusive, but interval is inclusive */
end -= 1;
mutex_lock(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, start, end);
while (it) {
struct amdgpu_mn_node *node;
@ -160,6 +163,8 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
amdgpu_bo_unreserve(bo);
}
}
mutex_unlock(&rmn->lock);
}
static const struct mmu_notifier_ops amdgpu_mn_ops = {
@ -196,6 +201,7 @@ static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
rmn->adev = adev;
rmn->mm = mm;
rmn->mn.ops = &amdgpu_mn_ops;
mutex_init(&rmn->lock);
rmn->objects = RB_ROOT;
r = __mmu_notifier_register(&rmn->mn, mm);
@ -242,7 +248,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
INIT_LIST_HEAD(&bos);
down_write(&rmn->mm->mmap_sem);
mutex_lock(&rmn->lock);
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
kfree(node);
@ -256,7 +262,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
if (!node) {
node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
if (!node) {
up_write(&rmn->mm->mmap_sem);
mutex_unlock(&rmn->lock);
return -ENOMEM;
}
}
@ -271,7 +277,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
interval_tree_insert(&node->it, &rmn->objects);
up_write(&rmn->mm->mmap_sem);
mutex_unlock(&rmn->lock);
return 0;
}
@ -297,7 +303,7 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
return;
}
down_write(&rmn->mm->mmap_sem);
mutex_lock(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
@ -312,6 +318,6 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
kfree(node);
}
up_write(&rmn->mm->mmap_sem);
mutex_unlock(&rmn->lock);
mutex_unlock(&adev->mn_lock);
}