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Reading from the DSB command buffer might be somewhat expensive on discrete GPUs because the buffer resides in GPU local memory. Avoid such reads in the indexed register write handling by tracking the previous instruction in intel_dsb. TODO: actually measure this Reviewed-by: Animesh Manna <animesh.manna@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240930170415.23841-2-ville.syrjala@linux.intel.com