drm/amdgpu: mask out WC from BO on unsupported arches

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index a2a16acee34d..b8fbbd7699e4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 #include <drm/drmP.h>
 #include <drm/amdgpu_drm.h>
+#include <drm/drm_cache.h>
 #include "amdgpu.h"
 #include "amdgpu_trace.h"
 
@@ -261,6 +262,13 @@ int amdgpu_bo_create_restricted(struct amdgpu_device *adev,
                                        AMDGPU_GEM_DOMAIN_OA);
 
         bo->flags = flags;
+
+        /* For architectures that don't support WC memory,
+         * mask out the WC flag from the BO
+         */
+        if (!drm_arch_can_wc_memory())
+                bo->flags &= ~AMDGPU_GEM_CREATE_CPU_GTT_USWC;
+
         amdgpu_fill_placement_to_bo(bo, placement);
         /* Kernel allocation are uninterruptible */
         r = ttm_bo_init(&adev->mman.bdev, &bo->tbo, size, type,