drm/amdgpu: improve vmid assigment V2

V2: the signaled items on the LRU maintain their order
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -216,6 +216,20 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 				      struct amdgpu_vm_manager_id,
 				      list);
 
+	if (id->mgr_id->active && !fence_is_signaled(id->mgr_id->active)) {
+		struct amdgpu_vm_manager_id *mgr_id, *tmp;
+		struct list_head *head = &adev->vm_manager.ids_lru;
+		list_for_each_entry_safe(mgr_id, tmp, &adev->vm_manager.ids_lru, list) {
+			if (mgr_id->active && fence_is_signaled(mgr_id->active)) {
+				list_move(&mgr_id->list, head);
+				head = &mgr_id->list;
+			}
+		}
+		id->mgr_id = list_first_entry(&adev->vm_manager.ids_lru,
+					      struct amdgpu_vm_manager_id,
+					      list);
+	}
+
 	r = amdgpu_sync_fence(ring->adev, sync, id->mgr_id->active);
 	if (!r) {
 		fence_put(id->mgr_id->active);