[PATCH V12 11/14] perf tools: Add missing_features for aux_start_paused, aux_pause, aux_resume

[Adrian Hunter]

Display "feature is not supported" error message if aux_start_paused,
aux_pause or aux_resume result in a perf_event_open() error.

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
Acked-by: Ian Rogers <irog...@google.com>
Reviewed-by: Andi Kleen <a...@linux.intel.com>
---
 tools/perf/util/evsel.c | 10 +++++++++-
 tools/perf/util/evsel.h |  1 +
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index d34ceab9e454..927aa61e7b14 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2147,7 +2147,13 @@ bool evsel__detect_missing_features(struct evsel *evsel)
         * Must probe features in the order they were added to the
         * perf_event_attr interface.
         */
-       if (!perf_missing_features.branch_counters &&
+       if (!perf_missing_features.aux_pause_resume &&
+           (evsel->core.attr.aux_pause || evsel->core.attr.aux_resume ||
+            evsel->core.attr.aux_start_paused)) {
+               perf_missing_features.aux_pause_resume = true;
+               pr_debug2_peo("Kernel has no aux_pause/aux_resume support, 
bailing out\n");
+               return false;
+       } else if (!perf_missing_features.branch_counters &&
            (evsel->core.attr.branch_sample_type & 
PERF_SAMPLE_BRANCH_COUNTERS)) {
                perf_missing_features.branch_counters = true;
                pr_debug2("switching off branch counters support\n");
@@ -3397,6 +3403,8 @@ int evsel__open_strerror(struct evsel *evsel, struct 
target *target,
                        return scnprintf(msg, size, "clockid feature not 
supported.");
                if (perf_missing_features.clockid_wrong)
                        return scnprintf(msg, size, "wrong clockid (%d).", 
clockid);
+               if (perf_missing_features.aux_pause_resume)
+                       return scnprintf(msg, size, "The 'aux_pause / 
aux_resume' feature is not supported, update the kernel.");
                if (perf_missing_features.aux_output)
                        return scnprintf(msg, size, "The 'aux_output' feature 
is not supported, update the kernel.");
                if (!target__has_cpu(target))
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 15e745a9a798..778fcdb8261f 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -221,6 +221,7 @@ struct perf_missing_features {
        bool weight_struct;
        bool read_lost;
        bool branch_counters;
+       bool aux_pause_resume;
 };
 
 extern struct perf_missing_features perf_missing_features;
-- 
2.43.0