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CP DMA and PKT3_WRITE_DATA (in CmdUpdateBuffer) don't (currently) write through L2. Therefore, to make these writes visible to later accesses we must invalidate L2 rather than just writing it back, to avoid the possibility that stale data is read through L2. Cc: "17.0" <mesa-stable@lists.freedesktop.org> Signed-off-by: Alex Smith <asmith@feralinteractive.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Signed-off-by: Dave Airlie <airlied@redhat.com>