drm/amdgpu: always reserve two slots for the VM

And drop the now superflous extra reservations.
Signed-off-by: NChristian König <christian.koenig@amd.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Reviewed-by: NJunwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: NHuang Rui <ray.huang@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -964,10 +964,6 @@ static int amdgpu_cs_vm_handling(struct amdgpu_cs_parser *p)
 	if (r)
 		return r;
 
-	r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv, 1);
-	if (r)
-		return r;
-
 	p->job->vm_pd_addr = amdgpu_gmc_pd_addr(vm->root.base.bo);
 
 	if (amdgpu_vm_debug) {

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

@@ -617,7 +617,8 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
 {
 	entry->priority = 0;
 	entry->tv.bo = &vm->root.base.bo->tbo;
-	entry->tv.num_shared = 1;
+	/* One for the VM updates and one for the CS job */
+	entry->tv.num_shared = 2;
 	entry->user_pages = NULL;
 	list_add(&entry->tv.head, validated);
 }
@@ -773,10 +774,6 @@ static int amdgpu_vm_clear_bo(struct amdgpu_device *adev,
 
 	ring = container_of(vm->entity.rq->sched, struct amdgpu_ring, sched);
 
-	r = reservation_object_reserve_shared(bo->tbo.resv, 1);
-	if (r)
-		return r;
-
 	r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 	if (r)
 		goto error;
@@ -1842,10 +1839,6 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	if (r)
 		goto error_free;
 
-	r = reservation_object_reserve_shared(vm->root.base.bo->tbo.resv, 1);
-	if (r)
-		goto error_free;
-
 	r = amdgpu_vm_update_ptes(&params, start, last + 1, addr, flags);
 	if (r)
 		goto error_free;
@@ -3026,6 +3019,10 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 	if (r)
 		goto error_free_root;
 
+	r = reservation_object_reserve_shared(root->tbo.resv, 1);
+	if (r)
+		goto error_unreserve;
+
 	r = amdgpu_vm_clear_bo(adev, vm, root,
 			       adev->vm_manager.root_level,
 			       vm->pte_support_ats);