From: Namhyung Kim <namhyung@kernel.org>
Date: Thu, 8 Jun 2023 23:23:58 +0000 (-0700)
Subject: perf list: Check if libpfm4 event is supported
X-Git-Tag: v6.6.7~2391^2~156
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d1f1cecc92ae0dba44eac3ce10baf4edb4553e41;p=platform%2Fkernel%2Flinux-starfive.git

perf list: Check if libpfm4 event is supported

Some of its event info cannot be used directly due to missing default
attributes.  Let's check if the event is supported before printing like
we do for hw and cache events.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers>@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20230608232400.3056312-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c
index 076aecc..4c1024c 100644
--- a/tools/perf/util/pfm.c
+++ b/tools/perf/util/pfm.c
@@ -13,6 +13,8 @@
 #include "util/pmus.h"
 #include "util/pfm.h"
 #include "util/strbuf.h"
+#include "util/cpumap.h"
+#include "util/thread_map.h"
 
 #include <string.h>
 #include <linux/kernel.h>
@@ -123,6 +125,36 @@ error:
 	return -1;
 }
 
+static bool is_libpfm_event_supported(const char *name, struct perf_cpu_map *cpus,
+				      struct perf_thread_map *threads)
+{
+	struct perf_pmu *pmu;
+	struct evsel *evsel;
+	struct perf_event_attr attr = {};
+	bool result = true;
+	int ret;
+
+	ret = pfm_get_perf_event_encoding(name, PFM_PLM0|PFM_PLM3,
+					  &attr, NULL, NULL);
+	if (ret != PFM_SUCCESS)
+		return false;
+
+	pmu = perf_pmus__find_by_type((unsigned int)attr.type);
+	evsel = parse_events__add_event(0, &attr, name, /*metric_id=*/NULL, pmu);
+	if (evsel == NULL)
+		return false;
+
+	evsel->is_libpfm_event = true;
+
+	if (evsel__open(evsel, cpus, threads) < 0)
+		result = false;
+
+	evsel__close(evsel);
+	evsel__delete(evsel);
+
+	return result;
+}
+
 static const char *srcs[PFM_ATTR_CTRL_MAX] = {
 	[PFM_ATTR_CTRL_UNKNOWN] = "???",
 	[PFM_ATTR_CTRL_PMU] = "PMU",
@@ -146,6 +178,8 @@ print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
 {
 	int j, ret;
 	char topic[80], name[80];
+	struct perf_cpu_map *cpus = perf_cpu_map__empty_new(1);
+	struct perf_thread_map *threads = thread_map__new_by_tid(0);
 
 	strbuf_setlen(buf, 0);
 	snprintf(topic, sizeof(topic), "pfm %s", pinfo->name);
@@ -185,14 +219,15 @@ print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
 				    ainfo.name, ainfo.desc);
 		}
 	}
-	print_cb->print_event(print_state,
-			pinfo->name,
-			topic,
-			name, info->equiv,
-			/*scale_unit=*/NULL,
-			/*deprecated=*/NULL, "PFM event",
-			info->desc, /*long_desc=*/NULL,
-			/*encoding_desc=*/buf->buf);
+
+	if (is_libpfm_event_supported(name, cpus, threads)) {
+		print_cb->print_event(print_state, pinfo->name, topic,
+				      name, info->equiv,
+				      /*scale_unit=*/NULL,
+				      /*deprecated=*/NULL, "PFM event",
+				      info->desc, /*long_desc=*/NULL,
+				      /*encoding_desc=*/buf->buf);
+	}
 
 	pfm_for_each_event_attr(j, info) {
 		pfm_event_attr_info_t ainfo;
@@ -215,6 +250,10 @@ print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
 			print_attr_flags(buf, &ainfo);
 			snprintf(name, sizeof(name), "%s::%s:%s",
 				 pinfo->name, info->name, ainfo.name);
+
+			if (!is_libpfm_event_supported(name, cpus, threads))
+				continue;
+
 			print_cb->print_event(print_state,
 					pinfo->name,
 					topic,
@@ -225,6 +264,9 @@ print_libpfm_event(const struct print_callbacks *print_cb, void *print_state,
 					/*encoding_desc=*/buf->buf);
 		}
 	}
+
+	perf_cpu_map__put(cpus);
+	perf_thread_map__put(threads);
 }
 
 void print_libpfm_events(const struct print_callbacks *print_cb, void *print_state)