perf pmu: Let pmu's with no events show up on perf list

perf list only lists PMUs with events.  Add a flag to cause a PMU to be
also listed separately.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1414061124-26830-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index e243ad962a4d..91dca604c422 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -747,15 +747,18 @@ void print_pmu_events(const char *event_glob, bool name_only)
 
         pmu = NULL;
         len = 0;
-        while ((pmu = perf_pmu__scan(pmu)) != NULL)
+        while ((pmu = perf_pmu__scan(pmu)) != NULL) {
                 list_for_each_entry(alias, &pmu->aliases, list)
                         len++;
+                if (pmu->selectable)
+                        len++;
+        }
         aliases = malloc(sizeof(char *) * len);
         if (!aliases)
                 return;
         pmu = NULL;
         j = 0;
-        while ((pmu = perf_pmu__scan(pmu)) != NULL)
+        while ((pmu = perf_pmu__scan(pmu)) != NULL) {
                 list_for_each_entry(alias, &pmu->aliases, list) {
                         char *name = format_alias(buf, sizeof(buf), pmu, alias);
                         bool is_cpu = !strcmp(pmu->name, "cpu");
@@ -772,6 +775,12 @@ void print_pmu_events(const char *event_glob, bool name_only)
                         aliases[j] = strdup(aliases[j]);
                         j++;
                 }
+                if (pmu->selectable) {
+                        scnprintf(buf, sizeof(buf), "%s//", pmu->name);
+                        aliases[j] = strdup(buf);
+                        j++;
+                }
+        }
         len = j;
         qsort(aliases, len, sizeof(char *), cmp_string);
         for (j = 0; j < len; j++) {