RE: [PATCH 3/5] drm/ttm: remove the backing store if no placement is given

["He, Roger" <Hongbo.He@amd.com>]

Acked-by: Roger He <Hongbo.He@amd.com>

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces@lists.freedesktop.org] On Behalf Of Christian K?nig
Sent: Sunday, March 25, 2018 6:58 PM
To: linaro-mm-sig@lists.linaro.org; linux-media@vger.kernel.org; dri-devel@lists.freedesktop.org; amd-gfx@lists.freedesktop.org; sumit.semwal@linaro.org
Subject: [PATCH 3/5] drm/ttm: remove the backing store if no placement is given

Pipeline removal of the BOs backing store when the 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 98e06f8bf23b..17e821f01d0a 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1078,6 +1078,18 @@ 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.
 	 */
--
2.14.1

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