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perf/x86/cstate: Allow reading the package statistics from local CPU

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The MSR registers for reading the package residency counters are
available on every CPU of the package. To avoid doing unnecessary SMP
calls to read the values for these from the various CPUs inside a
package, allow reading them from any CPU of the package.

Suggested-by: Kan Liang <kan.liang@intel.com>
Signed-off-by: Tero Kristo <tero.kristo@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20230912124432.3616761-2-tero.kristo@linux.intel.com
This commit is contained in:
Tero Kristo 2023-09-12 15:44:31 +03:00 committed by Peter Zijlstra
parent 38cd5b6a87
commit 05276d4831
1 changed files with 3 additions and 0 deletions
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arch/x86/events/intel/cstate.c
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@ -336,6 +336,9 @@ static int cstate_pmu_event_init(struct perf_event *event)
cfg = array_index_nospec((unsigned long)cfg, PERF_CSTATE_PKG_EVENT_MAX);
if (!(pkg_msr_mask & (1 << cfg)))
return -EINVAL;
event->event_caps |= PERF_EV_CAP_READ_ACTIVE_PKG;
event->hw.event_base = pkg_msr[cfg].msr;
cpu = cpumask_any_and(&cstate_pkg_cpu_mask,
topology_die_cpumask(event->cpu));