linux-kernel - [PATCH 1/4] perf trace-event-info: Add tracepoint_id_to

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Date:   Wed, 19 Apr 2023 12:29:09 +0000
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <anshuman.khandual@....com>,
        <jesussanp@...gle.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH 1/4] perf trace-event-info: Add tracepoint_id_to_name() helper

Add tracepoint_id_to_name() helper to search for the trace events directory
by given event id and return the corresponding tracepoint.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/util/trace-event-info.c | 13 +++++++++++++
 tools/perf/util/trace-event.h      |  6 ++++++
 2 files changed, 19 insertions(+)

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index c24b3a15e319..79907caaf0ca 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -466,6 +466,19 @@ static struct tracepoint_path *tracepoint_id_to_path(u64 config)
 	return NULL;
 }
 
+char *tracepoint_id_to_name(u64 config)
+{
+	char buf[MAX_EVENT_LENGTH];
+	struct tracepoint_path *path = NULL;
+
+	path = tracepoint_id_to_path(config);
+	if (path == NULL)
+		return NULL;
+
+	snprintf(buf, sizeof(buf), "%s:%s", path->system, path->name);
+	return strdup(buf);
+}
+
 static struct tracepoint_path *tracepoint_name_to_path(const char *name)
 {
 	struct tracepoint_path *path = zalloc(sizeof(*path));
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index a0cff184b1cd..a69ee29419f3 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -62,6 +62,12 @@ unsigned long long eval_flag(const char *flag);
 
 int read_tracing_data(int fd, struct list_head *pattrs);
 
+/*
+ * Return the tracepoint name in the format "subsystem:event_name",
+ * callers should free the returned string.
+ */
+char *tracepoint_id_to_name(u64 config);
+
 struct tracing_data {
 	/* size is only valid if temp is 'true' */
 	ssize_t size;
-- 
2.30.GIT