perf list: Avoid a hardcoded cpu PMU name

Use the first core PMU instead.

On a Raspberry Pi, before:

  $ perf list
  ...
    cpu/t1=v1[,t2=v2,t3 ...]/modifier                  [Raw hardware event descriptor]
         [(see 'man perf-list' on how to encode it)]
  ...

After:

  $ perf list
  ...
    armv8_cortex_a72/t1=v1[,t2=v2,t3 ...]/modifier     [Raw hardware event descriptor]
         [(see 'man perf-list' on how to encode it)]
  ...
  ```

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20230906234416.3472339-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index a7566edc86a3e35e9949739d34b5692a5577125e..b0fc48be623f31bcfd478a79b66b5295708a5a15 100644 (file)
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -395,6 +395,8 @@ void print_symbol_events(const struct print_callbacks *print_cb, void *print_sta
  */
 void print_events(const struct print_callbacks *print_cb, void *print_state)
 {
+       char *tmp;
+
        print_symbol_events(print_cb, print_state, PERF_TYPE_HARDWARE,
                        event_symbols_hw, PERF_COUNT_HW_MAX);
        print_symbol_events(print_cb, print_state, PERF_TYPE_SOFTWARE,
@@ -418,17 +420,21 @@ void print_events(const struct print_callbacks *print_cb, void *print_state)
                        /*long_desc=*/NULL,
                        /*encoding_desc=*/NULL);
 
-       print_cb->print_event(print_state,
-                       /*topic=*/NULL,
-                       /*pmu_name=*/NULL,
-                       "cpu/t1=v1[,t2=v2,t3 ...]/modifier",
-                       /*event_alias=*/NULL,
-                       /*scale_unit=*/NULL,
-                       /*deprecated=*/false,
-                       event_type_descriptors[PERF_TYPE_RAW],
-                       "(see 'man perf-list' on how to encode it)",
-                       /*long_desc=*/NULL,
-                       /*encoding_desc=*/NULL);
+       if (asprintf(&tmp, "%s/t1=v1[,t2=v2,t3 ...]/modifier",
+                    perf_pmus__scan_core(/*pmu=*/NULL)->name) > 0) {
+               print_cb->print_event(print_state,
+                               /*topic=*/NULL,
+                               /*pmu_name=*/NULL,
+                               tmp,
+                               /*event_alias=*/NULL,
+                               /*scale_unit=*/NULL,
+                               /*deprecated=*/false,
+                               event_type_descriptors[PERF_TYPE_RAW],
+                               "(see 'man perf-list' on how to encode it)",
+                               /*long_desc=*/NULL,
+                               /*encoding_desc=*/NULL);
+               free(tmp);
+       }
 
        print_cb->print_event(print_state,
                        /*topic=*/NULL,