[PATCH 1/3] perf list: Check if libpfm4 event is supported

Namhyung Kim
2023-06-08T23:24:10Z

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.

Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/pfm.c | 58 +++++++++++++++++++++++++++++++++++++------
1 file changed, 50 insertions(+), 8 deletions(-)

diff --git a/tools/perf/util/pfm.c b/tools/perf/util/pfm.c
index 076aecc22c16..4c1024c343dd 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 @@ int parse_libpfm_events_option(const struct option *opt, const char *str,
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)