drm/amdgpu/gfx: consolidate mqd buffer setup code

It was duplicated across multiple generations.

Reviewed-by: Alex Xie <AlexBin.Xie@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index b1766fa..1f27905 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -43,6 +43,10 @@ void amdgpu_gfx_kiq_fini(struct amdgpu_device *adev);
 int amdgpu_gfx_kiq_init(struct amdgpu_device *adev,
 			unsigned hpd_size);
 
+int amdgpu_gfx_compute_mqd_sw_init(struct amdgpu_device *adev,
+				   unsigned mqd_size);
+void amdgpu_gfx_compute_mqd_sw_fini(struct amdgpu_device *adev);
+
 /**
  * amdgpu_gfx_create_bitmask - create a bitmask
  *