linux-kernel - [PATCH v9 4/7] perf evsel x86: Make evsel__has_perf

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Message-Id: <20240926144851.245903-5-james.clark@linaro.org>
Date: Thu, 26 Sep 2024 15:48:35 +0100
From: James Clark <james.clark@...aro.org>
To: irogers@...gle.com,
	linux-perf-users@...r.kernel.org,
	kan.liang@...ux.intel.com,
	ak@...ux.intel.com,
	namhyung@...nel.org
Cc: James Clark <james.clark@...aro.org>,
	John Garry <john.g.garry@...cle.com>,
	Will Deacon <will@...nel.org>,
	Mike Leach <mike.leach@...aro.org>,
	Leo Yan <leo.yan@...ux.dev>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Weilin Wang <weilin.wang@...el.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
	Yang Jihong <yangjihong@...edance.com>,
	Colin Ian King <colin.i.king@...il.com>,
	Howard Chu <howardchu95@...il.com>,
	Ze Gao <zegao2021@...il.com>,
	Yunseong Kim <yskelg@...il.com>,
	Sun Haiyong <sunhaiyong@...ngson.cn>,
	Jing Zhang <renyu.zj@...ux.alibaba.com>,
	Yicong Yang <yangyicong@...ilicon.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v9 4/7] perf evsel x86: Make evsel__has_perf_metrics work for legacy events

From: Ian Rogers <irogers@...gle.com>

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 <namhyung@...nel.org>
Signed-off-by: Ian Rogers <irogers@...gle.com>
Acked-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: James Clark <james.clark@...aro.org>
---
 tools/perf/arch/x86/util/evsel.c | 31 ++++++++++++++++++++++++++-----
 tools/perf/util/pmu.c            |  2 +-
 tools/perf/util/pmu.h            |  1 +
 3 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/tools/perf/arch/x86/util/evsel.c b/tools/perf/arch/x86/util/evsel.c
index 090d0f371891..ec2ac3bbb76f 100644
--- a/tools/perf/arch/x86/util/evsel.c
+++ b/tools/perf/arch/x86/util/evsel.c
@@ -21,7 +21,8 @@ void arch_evsel__set_sample_weight(struct evsel *evsel)
 /* 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
@@ -31,11 +32,31 @@ bool evsel__sys_has_perf_metrics(const struct evsel *evsel)
 	 * 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;
+	}
+
+	pmu = evsel->pmu;
+	if (pmu && perf_pmu__is_fake(pmu))
+		pmu = NULL;
 
-	return false;
+	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)
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index e32d601b48f1..8993b5853687 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1168,7 +1168,7 @@ struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pm
 	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;
 }
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index f4271395c374..d352d53b8d55 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -281,5 +281,6 @@ struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pm
 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 */
-- 
2.34.1