[PATCH V13 11/14] perf tools: Add missing_features for aux_start_paused, aux_pause, aux_resume

Adrian Hunter
2024-10-14T10:53:44Z

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.hunter@intel.com>
Acked-by: Ian Rogers <irogers@google.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
---

Changes in V13:
Add error message also in EOPNOTSUPP case (Leo)

tools/perf/util/evsel.c | 12 ++++++++++++
tools/perf/util/evsel.h | 1 +
2 files changed, 13 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 9621c8c12406..fd28ff5437b5 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2177,6 +2177,12 @@ bool evsel__detect_missing_features(struct evsel *evsel)
perf_missing_features.inherit_sample_read = true;
pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n");
return true;
+ } else 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;
@@ -3397,6 +3403,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
return scnprintf(msg, size,
"%s: PMU Hardware doesn't support 'aux_output' feature",
evsel__name(evsel));
+ if (evsel->core.attr.aux_action)
+ return scnprintf(msg, size,
+ "%s: PMU Hardware doesn't support 'aux_action' 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'",
@@ -3427,6 +3437,8 @@ 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 bd08d94d3f8a..d40df2051718 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;
bool inherit_sample_read;
};

--
2.43.0