drm/amdgpu: add lock for interval tree in vm

Change-Id: I62b892a22af37b32e6b4aefca80a25cf45426ed2
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>

2 files changed, 15 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index a5692624070a..306f75700bf8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -954,6 +954,8 @@ struct amdgpu_vm {
 
         /* for id and flush management per ring */
         struct amdgpu_vm_id     ids[AMDGPU_MAX_RINGS];
+        /* for interval tree */
+        spinlock_t              it_lock;
 };
 
 struct amdgpu_vm_manager {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 0bdbb2480f9b..0513f3fed2c2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1028,7 +1028,9 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
         saddr /= AMDGPU_GPU_PAGE_SIZE;
         eaddr /= AMDGPU_GPU_PAGE_SIZE;
 
+        spin_lock(&vm->it_lock);
         it = interval_tree_iter_first(&vm->va, saddr, eaddr - 1);
+        spin_unlock(&vm->it_lock);
         if (it) {
                 struct amdgpu_bo_va_mapping *tmp;
                 tmp = container_of(it, struct amdgpu_bo_va_mapping, it);
@@ -1055,7 +1057,9 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
         mapping->flags = flags;
 
         list_add(&mapping->list, &bo_va->invalids);
+        spin_lock(&vm->it_lock);
         interval_tree_insert(&mapping->it, &vm->va);
+        spin_unlock(&vm->it_lock);
         trace_amdgpu_vm_bo_map(bo_va, mapping);
 
         /* Make sure the page tables are allocated */
@@ -1101,7 +1105,9 @@ int amdgpu_vm_bo_map(struct amdgpu_device *adev,
 
 error_free:
         list_del(&mapping->list);
+        spin_lock(&vm->it_lock);
         interval_tree_remove(&mapping->it, &vm->va);
+        spin_unlock(&vm->it_lock);
         trace_amdgpu_vm_bo_unmap(bo_va, mapping);
         kfree(mapping);
 
@@ -1151,7 +1157,9 @@ int amdgpu_vm_bo_unmap(struct amdgpu_device *adev,
         }
 
         list_del(&mapping->list);
+        spin_lock(&vm->it_lock);
         interval_tree_remove(&mapping->it, &vm->va);
+        spin_unlock(&vm->it_lock);
         trace_amdgpu_vm_bo_unmap(bo_va, mapping);
 
         if (valid)
@@ -1187,13 +1195,17 @@ void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
 
         list_for_each_entry_safe(mapping, next, &bo_va->valids, list) {
                 list_del(&mapping->list);
+                spin_lock(&vm->it_lock);
                 interval_tree_remove(&mapping->it, &vm->va);
+                spin_unlock(&vm->it_lock);
                 trace_amdgpu_vm_bo_unmap(bo_va, mapping);
                 list_add(&mapping->list, &vm->freed);
         }
         list_for_each_entry_safe(mapping, next, &bo_va->invalids, list) {
                 list_del(&mapping->list);
+                spin_lock(&vm->it_lock);
                 interval_tree_remove(&mapping->it, &vm->va);
+                spin_unlock(&vm->it_lock);
                 kfree(mapping);
         }
 
@@ -1248,7 +1260,7 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm)
         INIT_LIST_HEAD(&vm->invalidated);
         INIT_LIST_HEAD(&vm->cleared);
         INIT_LIST_HEAD(&vm->freed);
-
+        spin_lock_init(&vm->it_lock);
         pd_size = amdgpu_vm_directory_size(adev);
         pd_entries = amdgpu_vm_num_pdes(adev);
 
@@ -1312,7 +1324,6 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 
         amdgpu_bo_unref(&vm->page_directory);
         fence_put(vm->page_directory_fence);
-
         for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
                 unsigned id = vm->ids[i].id;