From: Kan Liang <kan.liang@linux.intel.com>
Date: Thu, 5 Sep 2024 17:07:35 +0000 (-0700)
Subject: perf mem: Check mem_events for all eligible PMUs
X-Git-Tag: v6.10.13~331
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f0ca1e9bef743c574ce5943981f86df3fbba2070;p=thirdparty%2Fkernel%2Fstable.git

perf mem: Check mem_events for all eligible PMUs

[ Upstream commit 6e05d28ff232cf445cc6ae59336b7f2081ef9b96 ]

The current perf_pmu__mem_events_init() only checks the availability of
the mem_events for the first eligible PMU. It works for non-hybrid
machines and hybrid machines that have the same mem_events.

However, it may bring issues if a hybrid machine has a different
mem_events on different PMU, e.g., Alder Lake and Raptor Lake. A
mem-loads-aux event is only required for the p-core. The mem_events on
both e-core and p-core should be checked and marked.

The issue was not found, because it's hidden by another bug, which only
records the mem-events for the e-core. The wrong check for the p-core
events didn't yell.

Fixes: abbdd79b786e036e ("perf mem: Clean up perf_mem_events__name()")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240905170737.4070743-1-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index c157bd31f2e5a..0b2cb59212938 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -3266,7 +3266,7 @@ static int perf_c2c__record(int argc, const char **argv)
 		return -1;
 	}
 
-	if (perf_pmu__mem_events_init(pmu)) {
+	if (perf_pmu__mem_events_init()) {
 		pr_err("failed: memory events not supported\n");
 		return -1;
 	}
diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index 93413cfcd585a..7fdbaaed14af2 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -97,7 +97,7 @@ static int __cmd_record(int argc, const char **argv, struct perf_mem *mem)
 		return -1;
 	}
 
-	if (perf_pmu__mem_events_init(pmu)) {
+	if (perf_pmu__mem_events_init()) {
 		pr_err("failed: memory events not supported\n");
 		return -1;
 	}
diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
index 6dda47bb774fa..c844aca0726ce 100644
--- a/tools/perf/util/mem-events.c
+++ b/tools/perf/util/mem-events.c
@@ -191,7 +191,7 @@ static bool perf_pmu__mem_events_supported(const char *mnt, struct perf_pmu *pmu
 	return !stat(path, &st);
 }
 
-int perf_pmu__mem_events_init(struct perf_pmu *pmu)
+static int __perf_pmu__mem_events_init(struct perf_pmu *pmu)
 {
 	const char *mnt = sysfs__mount();
 	bool found = false;
@@ -218,6 +218,18 @@ int perf_pmu__mem_events_init(struct perf_pmu *pmu)
 	return found ? 0 : -ENOENT;
 }
 
+int perf_pmu__mem_events_init(void)
+{
+	struct perf_pmu *pmu = NULL;
+
+	while ((pmu = perf_pmus__scan_mem(pmu)) != NULL) {
+		if (__perf_pmu__mem_events_init(pmu))
+			return -ENOENT;
+	}
+
+	return 0;
+}
+
 void perf_pmu__mem_events_list(struct perf_pmu *pmu)
 {
 	int j;
diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
index ca31014d7934f..a6fc2a5939388 100644
--- a/tools/perf/util/mem-events.h
+++ b/tools/perf/util/mem-events.h
@@ -30,7 +30,7 @@ extern unsigned int perf_mem_events__loads_ldlat;
 extern struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX];
 
 int perf_pmu__mem_events_parse(struct perf_pmu *pmu, const char *str);
-int perf_pmu__mem_events_init(struct perf_pmu *pmu);
+int perf_pmu__mem_events_init(void);
 
 struct perf_mem_event *perf_pmu__mem_events_ptr(struct perf_pmu *pmu, int i);
 struct perf_pmu *perf_mem_events_find_pmu(void);