[PATCH 2/6] drm/ttm: remove the backing store if no placement is given

From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	amd-gfx@lists.freedesktop.org
Subject: [PATCH 2/6] drm/ttm: remove the backing store if no placement is given
Date: Tue, 18 Jun 2019 13:54:51 +0200	[thread overview]
Message-ID: <20190618115455.1253-2-christian.koenig@amd.com> (raw)
In-Reply-To: <20190618115455.1253-1-christian.koenig@amd.com>

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

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c7de667d482a..682a1a035b35 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1240,6 +1240,18 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
 	uint32_t new_flags;
 
 	reservation_object_assert_held(bo->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.
 	 */
-- 
2.17.1

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