perf evsel x86: Make evsel__has_perf_metrics work for legacy events

Use PMU interface to better detect core PMU for legacy events. Look
for slots event on core PMU if it is appropriate for the event.

Acked-by: Namhyung Kim <[e-mail]>
Signed-off-by: Ian Rogers <[e-mail]>
Acked-by: Kan Liang <[e-mail]>
Signed-off-by: James Clark <[e-mail]>
Cc: Yang Jihong <[e-mail]>
Cc: Dominique Martinet <[e-mail]>
Cc: Colin Ian King <[e-mail]>
Cc: Howard Chu <[e-mail]>
Cc: Yunseong Kim <[e-mail]>
Cc: Ze Gao <[e-mail]>
Cc: Yicong Yang <[e-mail]>
Cc: Weilin Wang <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Jing Zhang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: [e-mail]
Cc: Athira Rajeev <[e-mail]>
Cc: [e-mail]
Cc: Sun Haiyong <[e-mail]>
Cc: John Garry <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/arch/x86/util/evsel.c

···
 /* Check whether the evsel's PMU supports the perf metrics */
 bool evsel__sys_has_perf_metrics(const struct evsel *evsel)
 {
-	const char *pmu_name = evsel->pmu_name ? evsel->pmu_name : "cpu";
+	struct perf_pmu *pmu;
+	u32 type = evsel->core.attr.type;
 
 	/*
 	 * The PERF_TYPE_RAW type is the core PMU type, e.g., "cpu" PMU
···
 	 * Checking both the PERF_TYPE_RAW type and the slots event
 	 * should be good enough to detect the perf metrics feature.
 	 */
-	if ((evsel->core.attr.type == PERF_TYPE_RAW) &&
-	    perf_pmus__have_event(pmu_name, "slots"))
-		return true;
+again:
+	switch (type) {
+	case PERF_TYPE_HARDWARE:
+	case PERF_TYPE_HW_CACHE:
+		type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
+		if (type)
+			goto again;
+		break;
+	case PERF_TYPE_RAW:
+		break;
+	default:
+		return false;
+	}
 
-	return false;
+	pmu = evsel->pmu;
+	if (pmu && perf_pmu__is_fake(pmu))
+		pmu = NULL;
+
+	if (!pmu) {
+		while ((pmu = perf_pmus__scan_core(pmu)) != NULL) {
+			if (pmu->type == PERF_TYPE_RAW)
+				break;
+		}
+	}
+	return pmu && perf_pmu__have_event(pmu, "slots");
 }
 
 bool arch_evsel__must_be_in_group(const struct evsel *evsel)

tools/perf/util/pmu.c

···
 	return pmu;
 }
 
-static bool perf_pmu__is_fake(const struct perf_pmu *pmu)
+bool perf_pmu__is_fake(const struct perf_pmu *pmu)
 {
 	return pmu->type == PERF_PMU_TYPE_FAKE;
 }

tools/perf/util/pmu.h

···
 void perf_pmu__delete(struct perf_pmu *pmu);
 struct perf_pmu *perf_pmus__find_core_pmu(void);
 const char *perf_pmu__name_from_config(struct perf_pmu *pmu, u64 config);
+bool perf_pmu__is_fake(const struct perf_pmu *pmu);
 
 #endif /* __PMU_H */