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From: Adrian Hunter <adrian.hunter@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
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	Arnaldo Carvalho de Melo <acme@kernel.org>,
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Subject: [PATCH V5 09/12] perf tools: Add missing_features for aux_start_paused, aux_pause, aux_resume
Date: Thu,  8 Feb 2024 13:31:24 +0200
Message-Id: <20240208113127.22216-10-adrian.hunter@intel.com>
In-Reply-To: <20240208113127.22216-1-adrian.hunter@intel.com>
References: <20240208113127.22216-1-adrian.hunter@intel.com>
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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>
---
 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 8401685461bf..9d2fde919604 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1890,7 +1890,13 @@ 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");
@@ -3089,6 +3095,8 @@ 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 517cff431de2..8ef5a6fdbd45 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -192,6 +192,7 @@ 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;
-- 
2.34.1