drm/amdgpu: Add new ring callback to insert memory sync
Used to flush and invalidate various caches. v2: Rename function hook Signed-off-by: NAndrey Grodzovsky <andrey.grodzovsky@amd.com> Reviewed-by: NLuben Tuikov <luben.tuikov@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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