drm/xe: Pipeline evict / restore of pinned BOs during suspend / resume

Rather than waiting for each evict / restore of pinned BOs to complete
just wait on migrate exec queue to be idle once during suspend / resume.

Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240305173503.285223-1-matthew.brost@intel.com

drivers/gpu/drm/xe/xe_bo.c

@@ -816,7 +816,6 @@ static int xe_bo_move(struct ttm_buffer_object *ttm_bo, bool evict,
  * @bo: The buffer object to move.
  *
  * On successful completion, the object memory will be moved to sytem memory.
- * This function blocks until the object has been fully moved.
  *
  * This is needed to for special handling of pinned VRAM object during
  * suspend-resume.
@@ -873,9 +872,6 @@ int xe_bo_evict_pinned(struct xe_bo *bo)
 	if (ret)
 		goto err_res_free;
 
-	dma_resv_wait_timeout(bo->ttm.base.resv, DMA_RESV_USAGE_KERNEL,
-			      false, MAX_SCHEDULE_TIMEOUT);
-
 	return 0;
 
 err_res_free:
@@ -888,7 +884,6 @@ int xe_bo_evict_pinned(struct xe_bo *bo)
  * @bo: The buffer object to move.
  *
  * On successful completion, the object memory will be moved back to VRAM.
- * This function blocks until the object has been fully moved.
  *
  * This is needed to for special handling of pinned VRAM object during
  * suspend-resume.
@@ -930,9 +925,6 @@ int xe_bo_restore_pinned(struct xe_bo *bo)
 	if (ret)
 		goto err_res_free;
 
-	dma_resv_wait_timeout(bo->ttm.base.resv, DMA_RESV_USAGE_KERNEL,
-			      false, MAX_SCHEDULE_TIMEOUT);
-
 	return 0;
 
 err_res_free:

drivers/gpu/drm/xe/xe_bo_evict.c

@@ -220,7 +220,7 @@ int xe_bo_restore_user(struct xe_device *xe)
 	list_splice_tail(&still_in_list, &xe->pinned.external_vram);
 	spin_unlock(&xe->pinned.lock);
 
-	/* Wait for validate to complete */
+	/* Wait for restore to complete */
 	for_each_tile(tile, xe, id)
 		xe_tile_migrate_wait(tile);