perf list: Fix the output to not include tracepoints without an id

Stop perf list from displaying tracepoints without an id file,
those are special tracepoints that are not interfaced to
perfcounters so listing them is erroneous and passing them as
events will produce no output.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 17 insertions, 1 deletions

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index f77407b5832e..4858d83b3b67 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -121,13 +121,29 @@ static unsigned long hw_cache_stat[C(MAX)] = {
            (strcmp(sys_dirent.d_name, ".")) &&                                 \
            (strcmp(sys_dirent.d_name, "..")))
 
+static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
+{
+        char evt_path[MAXPATHLEN];
+        int fd;
+
+        snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
+                        sys_dir->d_name, evt_dir->d_name);
+        fd = open(evt_path, O_RDONLY);
+        if (fd < 0)
+                return -EINVAL;
+        close(fd);
+
+        return 0;
+}
+
 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next, file, st)    \
         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
         if (snprintf(file, MAXPATHLEN, "%s/%s/%s", debugfs_path,               \
                      sys_dirent.d_name, evt_dirent.d_name) &&                  \
            (!stat(file, &st)) && (S_ISDIR(st.st_mode)) &&                      \
            (strcmp(evt_dirent.d_name, ".")) &&                                 \
-           (strcmp(evt_dirent.d_name, "..")))
+           (strcmp(evt_dirent.d_name, "..")) &&                                \
+           (!tp_event_has_id(&sys_dirent, &evt_dirent)))
 
 #define MAX_EVENT_LENGTH 30