[PATCH] drm/amdgpu: Inherit coherence flags on dmabuf import

[Felix Kuehling]

When importing dmabufs from other amdgpu devices, inherit the coherence
flags from the exported BO. This ensures correct MTYPEs in the GPU PTEs
for multi-GPU mappings of shared BOs.

Fixes: 763fbebb20e1 ("drm/amdgpu: Set MTYPE in PTE based on BO flags")
Tested-by: Gang Ba <Gang.Ba at amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
index 7bd8e33b14be..271e30e34d93 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c
@@ -328,7 +328,9 @@ amdgpu_dma_buf_create_obj(struct drm_device *dev, struct dma_buf *dma_buf)
 	if (dma_buf->ops == &amdgpu_dmabuf_ops) {
 		struct amdgpu_bo *other = gem_to_amdgpu_bo(dma_buf->priv);
 
-		flags |= other->flags & AMDGPU_GEM_CREATE_CPU_GTT_USWC;
+		flags |= other->flags & (AMDGPU_GEM_CREATE_CPU_GTT_USWC |
+					 AMDGPU_GEM_CREATE_COHERENT |
+					 AMDGPU_GEM_CREATE_UNCACHED);
 	}
 
 	ret = amdgpu_gem_object_create(adev, dma_buf->size, PAGE_SIZE,
-- 
2.32.0