perf/x86: Optimize the is_x86_event

The current is_x86_event has to go through the hybrid_pmus list to find
the matched pmu, then check if it's a X86 PMU and a X86 event. It's not
necessary.

The X86 PMU has a unique type ID on a non-hybrid machine, and a unique
capability type. They are good enough to do the check.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250424134718.311934-5-kan.liang@linux.intel.com

diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index b2762f268dd0fc17eab0843236d1099dd369f7ab..92c3fb61f2d69a9206a970e34445515e1f1a3bd3 100644 (file)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -762,15 +762,16 @@ void x86_pmu_enable_all(int added)
 
 int is_x86_event(struct perf_event *event)
 {
-       int i;
-
-       if (!is_hybrid())
-               return event->pmu == &pmu;
-
-       for (i = 0; i < x86_pmu.num_hybrid_pmus; i++) {
-               if (event->pmu == &x86_pmu.hybrid_pmu[i].pmu)
-                       return true;
-       }
+       /*
+        * For a non-hybrid platforms, the type of X86 pmu is
+        * always PERF_TYPE_RAW.
+        * For a hybrid platform, the PERF_PMU_CAP_EXTENDED_HW_TYPE
+        * is a unique capability for the X86 PMU.
+        * Use them to detect a X86 event.
+        */
+       if (event->pmu->type == PERF_TYPE_RAW ||
+           event->pmu->capabilities & PERF_PMU_CAP_EXTENDED_HW_TYPE)
+               return true;
 
        return false;
 }