perf tools: Improve aux_output not supported error

For example:

 Before:
   $ perf record -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -- ls -l
   Error:
   branch-loads: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'

 After:
   $ perf record -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -- ls -l
   Error:
   branch-loads: PMU Hardware doesn't support 'aux_output' feature

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200710151104.15137-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 11794d3..b1845f7 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2535,6 +2535,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
         "No such device - did you specify an out-of-range profile CPU?");
                break;
        case EOPNOTSUPP:
+               if (evsel->core.attr.aux_output)
+                       return scnprintf(msg, size,
+       "%s: PMU Hardware doesn't support 'aux_output' feature",
+                                        evsel__name(evsel));
                if (evsel->core.attr.sample_period != 0)
                        return scnprintf(msg, size,
        "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",