SPM is hardware feature that allows us to dump performance counters
at a sampling interval to a buffer. It is used by RGP to report cache
counters.
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13704>
Samuel Pitoiset