drm/ttm: remove the backing store if no placement is given

Pipeline removal of the BOs backing store when no placement is given
during validation.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/353994/?series=73646&rev=1

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 151edfd..6d1e91b 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1196,6 +1196,18 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
        uint32_t new_flags;
 
        dma_resv_assert_held(bo->base.resv);
+
+       /*
+        * Remove the backing store if no placement is given.
+        */
+       if (!placement->num_placement && !placement->num_busy_placement) {
+               ret = ttm_bo_pipeline_gutting(bo);
+               if (ret)
+                       return ret;
+
+               return ttm_tt_create(bo, false);
+       }
+
        /*
         * Check whether we need to move buffer.
         */