[PATCH 6/6] drm/ttm: stop allocating a dummy resource for pipelined gutting

[Ruhl, Michael J]

>-----Original Message-----
>From: dri-devel <dri-devel-bounces at lists.freedesktop.org> On Behalf Of
>Christian König
>Sent: Thursday, July 7, 2022 6:25 AM
>To: intel-gfx at lists.freedesktop.org; dri-devel at lists.freedesktop.org;
>nouveau at lists.freedesktop.org; amd-gfx at lists.freedesktop.org
>Cc: Christian König <christian.koenig at amd.com>
>Subject: [PATCH 6/6] drm/ttm: stop allocating a dummy resource for pipelined
>gutting
>
>That should not be necessary any more when drivers should at least be
>able to handle a move without a resource.
>
>Signed-off-by: Christian König <christian.koenig at amd.com>

Reviewed-by: Michael J. Ruhl <michael.j.ruhl at intel.com>

M

>---
> drivers/gpu/drm/ttm/ttm_bo_util.c | 15 ++-------------
> 1 file changed, 2 insertions(+), 13 deletions(-)
>
>diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c
>b/drivers/gpu/drm/ttm/ttm_bo_util.c
>index 1530982338e9..1e76149c62ff 100644
>--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
>+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
>@@ -603,16 +603,10 @@ EXPORT_SYMBOL(ttm_bo_move_sync_cleanup);
>  */
> int ttm_bo_pipeline_gutting(struct ttm_buffer_object *bo)
> {
>-	static const struct ttm_place sys_mem = { .mem_type =
>TTM_PL_SYSTEM };
> 	struct ttm_buffer_object *ghost;
>-	struct ttm_resource *sys_res;
> 	struct ttm_tt *ttm;
> 	int ret;
>
>-	ret = ttm_resource_alloc(bo, &sys_mem, &sys_res);
>-	if (ret)
>-		return ret;
>-
> 	/* If already idle, no need for ghost object dance. */
> 	ret = ttm_bo_wait(bo, false, true);
> 	if (ret != -EBUSY) {
>@@ -620,14 +614,13 @@ int ttm_bo_pipeline_gutting(struct
>ttm_buffer_object *bo)
> 			/* See comment below about clearing. */
> 			ret = ttm_tt_create(bo, true);
> 			if (ret)
>-				goto error_free_sys_mem;
>+				return ret;
> 		} else {
> 			ttm_tt_unpopulate(bo->bdev, bo->ttm);
> 			if (bo->type == ttm_bo_type_device)
> 				ttm_tt_mark_for_clear(bo->ttm);
> 		}
> 		ttm_resource_free(bo, &bo->resource);
>-		ttm_bo_assign_mem(bo, sys_res);
> 		return 0;
> 	}
>
>@@ -644,7 +637,7 @@ int ttm_bo_pipeline_gutting(struct ttm_buffer_object
>*bo)
> 	ret = ttm_tt_create(bo, true);
> 	swap(bo->ttm, ttm);
> 	if (ret)
>-		goto error_free_sys_mem;
>+		return ret;
>
> 	ret = ttm_buffer_object_transfer(bo, &ghost);
> 	if (ret)
>@@ -658,13 +651,9 @@ int ttm_bo_pipeline_gutting(struct
>ttm_buffer_object *bo)
> 	dma_resv_unlock(&ghost->base._resv);
> 	ttm_bo_put(ghost);
> 	bo->ttm = ttm;
>-	ttm_bo_assign_mem(bo, sys_res);
> 	return 0;
>
> error_destroy_tt:
> 	ttm_tt_destroy(bo->bdev, ttm);
>-
>-error_free_sys_mem:
>-	ttm_resource_free(bo, &sys_res);
> 	return ret;
> }
>--
>2.25.1