drm/amdgpu: hide VRAM sysfs attributes on GPUs without VRAM

Otherwise accessing them can cause a crash.

Signed-off-by: Christian König <[email protected]>
Tested-by: Mangesh Gadre <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Reviewed-by: Arunpravin Paneer Selvam <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

Author: ChristianKoenigAMD

drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c

@@ -234,6 +234,9 @@ static umode_t amdgpu_vram_attrs_is_visible(struct kobject *kobj,
 	    !adev->gmc.vram_vendor)
 		return 0;
 
+	if (!ttm_resource_manager_used(&adev->mman.vram_mgr.manager))
+		return 0;
+
 	return attr->mode;
 }