linux-kernel - [PATCH] perf: arm-spe: Fix perf report --mem-mode

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Date:   Fri,  8 Apr 2022 15:40:56 +0100
From:   James Clark <james.clark@....com>
To:     acme@...nel.org, linux-perf-users@...r.kernel.org,
        leo.yan@...aro.com
Cc:     German.Gomez@....com, James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] perf: arm-spe: Fix perf report --mem-mode

Since commit bb30acae4c4d ("perf report: Bail out --mem-mode if mem info
is not available") "perf mem report" and "perf report --mem-mode" don't
allow opening the file unless one of the events has PERF_SAMPLE_DATA_SRC
set.

SPE doesn't have this set even though synthetic memory data is generated
after it is decoded. Fix this issue by setting DATA_SRC on SPE events.
This has no effect on the data collected because the SPE driver doesn't
do anything with that flag and doesn't generate samples.

Fixes: bb30acae4c4d ("perf report: Bail out --mem-mode if mem info is not available")
Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/arch/arm64/util/arm-spe.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
index 86e2e926aa0e..a1419e6341c0 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -239,6 +239,12 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
 		arm_spe_set_timestamp(itr, arm_spe_evsel);
 	}
 
+	/*
+	 * Set this only so that perf report knows that SPE generates memory info. It has no effect
+	 * on the opening of the event or the SPE data produced.
+	 */
+	evsel__set_sample_bit(arm_spe_evsel, DATA_SRC);
+
 	/* Add dummy event to keep tracking */
 	err = parse_events(evlist, "dummy:u", NULL);
 	if (err)
@@ -523,6 +529,5 @@ struct perf_event_attr
 
 	arm_spe_pmu->selectable = true;
 	arm_spe_pmu->is_uncore = false;
-
 	return attr;
 }
-- 
2.28.0