drm/amdgpu: add perfmons accessible during df c-states
During DF C-State, Perfmon counters outside of range 1D700-1D7FF will encounter SLVERR affecting xGMI performance monitoring. PerfmonCtr[7:4] is being added to avoid SLVERR during read since it falls within this range. PerfmonCtl[7:4] is being added in order to arm PerfmonCtr[7:4]. Since PerfmonCtl[7:4] exists outside of range 1D700-1D7FF, DF routines will be enabled to opportunistically re-arm PerfmonCtl[7:4] on retry after SLVERR. Signed-off-by: Jonathan Kim <Jonathan.Kim@amd.com> Acked-by: Alex Deucher <Alexander.Deucher@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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