linux-kernel - [PATCH v1 2/3] perf pmu: Add PMU kind to simplify differentiating

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Message-ID: <20251114220547.496562-2-irogers@google.com>
Date: Fri, 14 Nov 2025 14:05:46 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Thomas Falcon <thomas.falcon@...el.com>, Howard Chu <howardchu95@...il.com>, 
	James Clark <james.clark@...aro.org>, Zhongqiu Han <quic_zhonhan@...cinc.com>, 
	Anubhav Shelat <ashelat@...hat.com>, Ravi Bangoria <ravi.bangoria@....com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 2/3] perf pmu: Add PMU kind to simplify differentiating

Rather than perf_pmu__is_xxx calls, and a notion of kind so that a
single call can be used.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/pmu.h | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 1ebcf0242af8..cfcaba3e2e75 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -37,6 +37,19 @@ struct perf_pmu_caps {
 	struct list_head list;
 };
 
+enum pmu_kind {
+	/* A perf event syscall PMU. */
+	PERF_PMU_KIND_PE,
+	/* A perf tool provided DRM PMU. */
+	PERF_PMU_KIND_DRM,
+	/* A perf tool provided HWMON PMU. */
+	PERF_PMU_KIND_HWMON,
+	/* Perf tool provided PMU for tool events like time. */
+	PERF_PMU_KIND_TOOL,
+	/* A testing PMU kind. */
+	PERF_PMU_KIND_FAKE
+};
+
 enum {
 	PERF_PMU_TYPE_PE_START    = 0,
 	PERF_PMU_TYPE_PE_END      = 0xFFFDFFFF,
@@ -306,4 +319,25 @@ void perf_pmu__delete(struct perf_pmu *pmu);
 const char *perf_pmu__name_from_config(struct perf_pmu *pmu, u64 config);
 bool perf_pmu__is_fake(const struct perf_pmu *pmu);
 
+static inline enum pmu_kind perf_pmu__kind(const struct perf_pmu *pmu)
+{
+	__u32 type;
+
+	if (!pmu)
+		return PERF_PMU_KIND_PE;
+
+	type = pmu->type;
+	if (type <= PERF_PMU_TYPE_PE_END)
+		return PERF_PMU_KIND_PE;
+	if (type <= PERF_PMU_TYPE_DRM_END)
+		return PERF_PMU_KIND_DRM;
+	if (type <= PERF_PMU_TYPE_DRM_END)
+		return PERF_PMU_KIND_DRM;
+	if (type <= PERF_PMU_TYPE_HWMON_END)
+		return PERF_PMU_KIND_HWMON;
+	if (type == PERF_PMU_TYPE_TOOL)
+		return PERF_PMU_KIND_TOOL;
+	return PERF_PMU_KIND_FAKE;
+}
+
 #endif /* __PMU_H */
-- 
2.52.0.rc1.455.g30608eb744-goog