[PATCH v5 1/4] perf trace-event-info: Add tracepoint_id_to_name() helper

[Yang Jihong]

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@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/util/trace-event-info.c | 12 ++++++++++++
 tools/perf/util/trace-event.h      |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index c24b3a15e319..319ccf09a435 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -466,6 +466,18 @@ static struct tracepoint_path *tracepoint_id_to_path(u64 config)
 	return NULL;
 }
 
+char *tracepoint_id_to_name(u64 config)
+{
+	struct tracepoint_path *path = tracepoint_id_to_path(config);
+	char *buf = NULL;
+
+	if (path && asprintf(&buf, "%s:%s", path->system, path->name) < 0)
+		buf = NULL;
+
+	put_tracepoints_path(path);
+	return 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