drm/amdgpu: add some lockdep checks to the VM code

Whenever a bo_va structure is added or removed the VM and eventually
added BO should be locked.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Reviewed-by: NFelix Kuehling <Felix.Kuehling@amd.com>
Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -2244,6 +2244,8 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,
 {
 	struct amdgpu_bo_va *bo_va;
 
+	dma_resv_assert_held(vm->root.bo->tbo.base.resv);
+
 	bo_va = kzalloc(sizeof(struct amdgpu_bo_va), GFP_KERNEL);
 	if (bo_va == NULL) {
 		return NULL;
@@ -2257,6 +2259,7 @@ struct amdgpu_bo_va *amdgpu_vm_bo_add(struct amdgpu_device *adev,
 	if (!bo)
 		return bo_va;
 
+	dma_resv_assert_held(bo->tbo.base.resv);
 	if (amdgpu_dmabuf_is_xgmi_accessible(adev, bo)) {
 		bo_va->is_xgmi = true;
 		/* Power up XGMI if it can be potentially used */
@@ -2651,7 +2654,10 @@ void amdgpu_vm_bo_rmv(struct amdgpu_device *adev,
 	struct amdgpu_vm *vm = bo_va->base.vm;
 	struct amdgpu_vm_bo_base **base;
 
+	dma_resv_assert_held(vm->root.bo->tbo.base.resv);
+
 	if (bo) {
+		dma_resv_assert_held(bo->tbo.base.resv);
 		if (bo->tbo.base.resv == vm->root.bo->tbo.base.resv)
 			vm->bulk_moveable = false;