linux-kernel - [PATCH 05/11] perf tools: Add API probes for new clock IDs

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Date:   Wed,  9 Feb 2022 10:49:23 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        kvm@...r.kernel.org, H Peter Anvin <hpa@...or.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Leo Yan <leo.yan@...aro.org>
Subject: [PATCH 05/11] perf tools: Add API probes for new clock IDs

Add ability to check whether the kernel supports new clock IDs
CLOCK_PERF_HW_CLOCK and CLOCK_PERF_HW_CLOCK_NS.
They will be used in a subsequent patch.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/perf_api_probe.c | 22 ++++++++++++++++++++++
 tools/perf/util/perf_api_probe.h |  2 ++
 2 files changed, 24 insertions(+)

diff --git a/tools/perf/util/perf_api_probe.c b/tools/perf/util/perf_api_probe.c
index c28dd50bd571..c70af544a08c 100644
--- a/tools/perf/util/perf_api_probe.c
+++ b/tools/perf/util/perf_api_probe.c
@@ -109,6 +109,18 @@ static void perf_probe_cgroup(struct evsel *evsel)
 	evsel->core.attr.cgroup = 1;
 }
 
+static void perf_probe_hw_clock(struct evsel *evsel)
+{
+	evsel->core.attr.use_clockid = 1;
+	evsel->core.attr.clockid = CLOCK_PERF_HW_CLOCK;
+}
+
+static void perf_probe_hw_clock_ns(struct evsel *evsel)
+{
+	evsel->core.attr.use_clockid = 1;
+	evsel->core.attr.clockid = CLOCK_PERF_HW_CLOCK_NS;
+}
+
 bool perf_can_sample_identifier(void)
 {
 	return perf_probe_api(perf_probe_sample_identifier);
@@ -195,3 +207,13 @@ bool perf_can_record_cgroup(void)
 {
 	return perf_probe_api(perf_probe_cgroup);
 }
+
+bool perf_can_perf_clock_hw_clock(void)
+{
+	return perf_probe_api(perf_probe_hw_clock);
+}
+
+bool perf_can_perf_clock_hw_clock_ns(void)
+{
+	return perf_probe_api(perf_probe_hw_clock_ns);
+}
diff --git a/tools/perf/util/perf_api_probe.h b/tools/perf/util/perf_api_probe.h
index b104168efb15..5b30cbd260cf 100644
--- a/tools/perf/util/perf_api_probe.h
+++ b/tools/perf/util/perf_api_probe.h
@@ -13,5 +13,7 @@ bool perf_can_record_text_poke_events(void);
 bool perf_can_sample_identifier(void);
 bool perf_can_record_build_id(void);
 bool perf_can_record_cgroup(void);
+bool perf_can_perf_clock_hw_clock(void);
+bool perf_can_perf_clock_hw_clock_ns(void);
 
 #endif // __PERF_API_PROBE_H
-- 
2.25.1