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

[James Clark]

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 at arm.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