linux-kernel - [PATCH 29/49] perf pmu: Add hybrid helper functions

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Date:   Mon,  8 Feb 2021 07:25:26 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...nel.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com
Subject: [PATCH 29/49] perf pmu: Add hybrid helper functions

From: Jin Yao <yao.jin@...ux.intel.com>

The functions perf_pmu__is_hybrid and perf_pmu__find_hybrid_pmu
can be used to identify the hybrid platform and return the found
hybrid cpu pmu. All the detected hybrid pmus have been saved in
'perf_pmu__hybrid_pmus' list. So we just need to search this list
for a pmu name.

perf_pmu__hybrid_type_to_pmu converts the user specified string
to hybrid pmu name. This is used to support the '--cputype' option
in next patches.

perf_pmu__hybrid_exist checks if hybrid pmus exist.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
 tools/perf/util/pmu.c | 40 ++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/pmu.h | 11 +++++++++++
 2 files changed, 51 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index e97b121..04447f5 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -1842,3 +1842,43 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu)
 
 	return nr_caps;
 }
+
+struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name)
+{
+	struct perf_pmu *pmu;
+
+	if (!name)
+		return NULL;
+
+	perf_pmu__for_each_hybrid_pmus(pmu) {
+		if (!strcmp(name, pmu->name))
+			return pmu;
+	}
+
+	return NULL;
+}
+
+bool perf_pmu__is_hybrid(const char *name)
+{
+	return perf_pmu__find_hybrid_pmu(name) != NULL;
+}
+
+char *perf_pmu__hybrid_type_to_pmu(const char *type)
+{
+	char *pmu_name = NULL;
+
+	if (asprintf(&pmu_name, "cpu_%s", type) < 0)
+		return NULL;
+
+	if (perf_pmu__is_hybrid(pmu_name))
+		return pmu_name;
+
+	/*
+	 * The pmus may be not scanned yet, so check the sysfs.
+	 */
+	if (pmu_is_hybrid(pmu_name))
+		return pmu_name;
+
+	free(pmu_name);
+	return NULL;;
+}
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 99bdb5d..bb74595 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -131,4 +131,15 @@ int perf_pmu__caps_parse(struct perf_pmu *pmu);
 #define perf_pmu__for_each_hybrid_pmus(pmu)	\
 	list_for_each_entry(pmu, &perf_pmu__hybrid_pmus, hybrid_list)
 
+struct perf_pmu *perf_pmu__find_hybrid_pmu(const char *name);
+
+bool perf_pmu__is_hybrid(const char *name);
+
+char *perf_pmu__hybrid_type_to_pmu(const char *type);
+
+static inline bool perf_pmu__hybrid_exist(void)
+{
+	return !list_empty(&perf_pmu__hybrid_pmus);
+}
+
 #endif /* __PMU_H */
-- 
2.7.4