From: =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>
Date: Tue, 20 Feb 2018 19:09:56 +0100
Subject: drm/amdgpu: drop the backing store when DMA-buf imports are evicted
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Git-commit: 82dee2418946737b5efa8d84e07ef921727018bc
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Instead of moving this to the SYSTEM domain just drop the backing store
and let the resulting allocation be freed.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -204,6 +204,12 @@ static void amdgpu_evict_flags(struct tt
 		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
 	};
 
+	if (bo->type == ttm_bo_type_sg) {
+		placement->num_placement = 0;
+		placement->num_busy_placement = 0;
+		return;
+	}
+
 	if (!amdgpu_ttm_bo_is_amdgpu_bo(bo)) {
 		placement->placement = &placements;
 		placement->busy_placement = &placements;