AMDGPU_RESV_FW_EXTEND
amdgpu_ttm_init_vram_resv(adev, AMDGPU_RESV_FW_EXTEND,
ret = amdgpu_ttm_mark_vram_reserved(adev, AMDGPU_RESV_FW_EXTEND);
amdgpu_ttm_unmark_vram_reserved(adev, AMDGPU_RESV_FW_EXTEND);