drm/amdgpu: remove TOPDOWN flags when allocating VRAM in large bar system

Since VRAM manager is changed from drm mm to drm buddy, the
TOP_DOWN flag should not be set by default in the large bar system.
Removing this flag helps improve drm buddy allocator efficiency and
reduce the risk of splitting higher order block into lower order.

Signed-off-by: Shane Xiao <shane.xiao@amd.com>
Reviewed-by: Christian K�nig <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 981010de0a2829a7e05fc343e8eed6e57900066f..e3e1ed4314dd65a84a918e4fc343a023abc713f5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -139,7 +139,7 @@ void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain)
 
                if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED)
                        places[c].lpfn = visible_pfn;
-               else
+               else if (adev->gmc.real_vram_size != adev->gmc.visible_vram_size)
                        places[c].flags |= TTM_PL_FLAG_TOPDOWN;
 
                if (flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS)