drm/amdgpu: Revert "remove the userptr rmn->lock"
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>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index d7ec9bd..c47f2222 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -48,7 +48,8 @@
/* 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 @@
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 @@
}
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 @@
/* 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 @@
amdgpu_bo_unreserve(bo);
}
}
+
+ mutex_unlock(&rmn->lock);
}
static const struct mmu_notifier_ops amdgpu_mn_ops = {
@@ -196,6 +201,7 @@
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 @@
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 @@
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 @@
interval_tree_insert(&node->it, &rmn->objects);
- up_write(&rmn->mm->mmap_sem);
+ mutex_unlock(&rmn->lock);
return 0;
}
@@ -297,7 +303,7 @@
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 @@
kfree(node);
}
- up_write(&rmn->mm->mmap_sem);
+ mutex_unlock(&rmn->lock);
mutex_unlock(&adev->mn_lock);
}