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drm/amdgpu: use a rw_semaphore for MMU notifiers

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Allow at least some parallel processing.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2017-09-05 14:50:24 +02:00 committed by Alex Deucher
parent 1b0c0f9dc5
commit 60de1c1740
1 changed files with 13 additions and 13 deletions
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26
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
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@ -50,7 +50,7 @@ struct amdgpu_mn {
struct hlist_node node;
/* objects protected by lock */
struct mutex lock;
struct rw_semaphore lock;
struct rb_root objects;
};
@ -74,7 +74,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
struct amdgpu_bo *bo, *next_bo;
mutex_lock(&adev->mn_lock);
mutex_lock(&rmn->lock);
down_write(&rmn->lock);
hash_del(&rmn->node);
rbtree_postorder_for_each_entry_safe(node, next_node, &rmn->objects,
it.rb) {
@ -84,7 +84,7 @@ static void amdgpu_mn_destroy(struct work_struct *work)
}
kfree(node);
}
mutex_unlock(&rmn->lock);
up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
mmu_notifier_unregister_no_release(&rmn->mn, rmn->mm);
kfree(rmn);
@ -160,7 +160,7 @@ static void amdgpu_mn_invalidate_page(struct mmu_notifier *mn,
struct amdgpu_mn *rmn = container_of(mn, struct amdgpu_mn, mn);
struct interval_tree_node *it;
mutex_lock(&rmn->lock);
down_read(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, address, address);
if (it) {
@ -170,7 +170,7 @@ static void amdgpu_mn_invalidate_page(struct mmu_notifier *mn,
amdgpu_mn_invalidate_node(node, address, address);
}
mutex_unlock(&rmn->lock);
up_read(&rmn->lock);
}
/**
@ -195,7 +195,7 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
/* notification is exclusive, but interval is inclusive */
end -= 1;
mutex_lock(&rmn->lock);
down_read(&rmn->lock);
it = interval_tree_iter_first(&rmn->objects, start, end);
while (it) {
@ -207,7 +207,7 @@ static void amdgpu_mn_invalidate_range_start(struct mmu_notifier *mn,
amdgpu_mn_invalidate_node(node, start, end);
}
mutex_unlock(&rmn->lock);
up_read(&rmn->lock);
}
static const struct mmu_notifier_ops amdgpu_mn_ops = {
@ -248,7 +248,7 @@ 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);
init_rwsem(&rmn->lock);
rmn->objects = RB_ROOT;
r = __mmu_notifier_register(&rmn->mn, mm);
@ -295,7 +295,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
INIT_LIST_HEAD(&bos);
mutex_lock(&rmn->lock);
down_write(&rmn->lock);
while ((it = interval_tree_iter_first(&rmn->objects, addr, end))) {
kfree(node);
@ -309,7 +309,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
if (!node) {
node = kmalloc(sizeof(struct amdgpu_mn_node), GFP_KERNEL);
if (!node) {
mutex_unlock(&rmn->lock);
up_write(&rmn->lock);
return -ENOMEM;
}
}
@ -324,7 +324,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
interval_tree_insert(&node->it, &rmn->objects);
mutex_unlock(&rmn->lock);
up_write(&rmn->lock);
return 0;
}
@ -350,7 +350,7 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
return;
}
mutex_lock(&rmn->lock);
down_write(&rmn->lock);
/* save the next list entry for later */
head = bo->mn_list.next;
@ -365,6 +365,6 @@ void amdgpu_mn_unregister(struct amdgpu_bo *bo)
kfree(node);
}
mutex_unlock(&rmn->lock);
up_write(&rmn->lock);
mutex_unlock(&adev->mn_lock);
}