From: Namhyung Kim <namhyung@kernel.org>
Date: Wed, 7 May 2025 21:59:39 +0000 (-0700)
Subject: perf pmu: Use available core PMU for raw events
X-Git-Tag: v6.16-rc1~57^2~80
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c60b7d6f50ae25a91a6998a8118bba325a382d28;p=linux-block.git

perf pmu: Use available core PMU for raw events

When it finds a matching PMU for a legacy event, it should look for
core PMUs.  The raw events also refers to core events so it should be
handled similarly.

On x86, PERF_TYPE_RAW should match with the existing cpu PMU.  But on
ARM, there's no PMU with the matching type so it'll pick the first core
PMU for it.

Suggested-by: Ian Rogers <irogers@google.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250507215939.54399-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index b99292de7669..3bbd26fec78a 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -727,14 +727,21 @@ struct perf_pmu *evsel__find_pmu(const struct evsel *evsel)
 	legacy_core_type =
 		evsel->core.attr.type == PERF_TYPE_HARDWARE ||
 		evsel->core.attr.type == PERF_TYPE_HW_CACHE;
-	if (!pmu && legacy_core_type) {
-		if (perf_pmus__supports_extended_type()) {
-			u32 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
+	if (!pmu && legacy_core_type && perf_pmus__supports_extended_type()) {
+		u32 type = evsel->core.attr.config >> PERF_PMU_TYPE_SHIFT;
 
-			pmu = perf_pmus__find_by_type(type);
-		} else {
-			pmu = perf_pmus__find_core_pmu();
-		}
+		pmu = perf_pmus__find_by_type(type);
+	}
+	if (!pmu && (legacy_core_type || evsel->core.attr.type == PERF_TYPE_RAW)) {
+		/*
+		 * For legacy events, if there was no extended type info then
+		 * assume the PMU is the first core PMU.
+		 *
+		 * On architectures like ARM there is no sysfs PMU with type
+		 * PERF_TYPE_RAW, assume the RAW events are going to be handled
+		 * by the first core PMU.
+		 */
+		pmu = perf_pmus__find_core_pmu();
 	}
 	((struct evsel *)evsel)->pmu = pmu;
 	return pmu;