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authorLeo Yan <leo.yan@linaro.org>2021-05-19 12:15:45 +0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-05-25 09:49:37 -0300
commitf99237e46432c4581a30b3afc053cef8d3df3ce5 (patch)
treebfad281d49315d53940b5ebc2743481dd5c5751a /tools/perf/arch
parente582badf1706a005359ef3e184fa97384e93f83a (diff)
downloadlinux-f99237e46432c4581a30b3afc053cef8d3df3ce5.tar.bz2
perf arm-spe: Enable timestamp for per-cpu mode
For per-cpu mmap, it should enable timestamp tracing for Arm SPE; this is helpful for samples correlation. To automatically enable the timestamp, a helper arm_spe_set_timestamp() is introduced for setting "ts_enable" format bit. Signed-off-by: Leo Yan <leo.yan@linaro.org> Reviewed-by: James Clark <james.clark@arm.com> Tested-by: James Clark <james.clark@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Al Grant <Al.Grant@arm.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: John Garry <john.garry@huawei.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20210519041546.1574961-4-leo.yan@linaro.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch')
-rw-r--r--tools/perf/arch/arm64/util/arm-spe.c33
1 files changed, 31 insertions, 2 deletions
diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
index 4c916626c203..bacdf366040d 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -14,6 +14,7 @@
#include "../../../util/cpumap.h"
#include "../../../util/event.h"
#include "../../../util/evsel.h"
+#include "../../../util/evsel_config.h"
#include "../../../util/evlist.h"
#include "../../../util/session.h"
#include <internal/lib.h> // page_size
@@ -32,6 +33,29 @@ struct arm_spe_recording {
struct evlist *evlist;
};
+static void arm_spe_set_timestamp(struct auxtrace_record *itr,
+ struct evsel *evsel)
+{
+ struct arm_spe_recording *ptr;
+ struct perf_pmu *arm_spe_pmu;
+ struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
+ u64 user_bits = 0, bit;
+
+ ptr = container_of(itr, struct arm_spe_recording, itr);
+ arm_spe_pmu = ptr->arm_spe_pmu;
+
+ if (term)
+ user_bits = term->val.cfg_chg;
+
+ bit = perf_pmu__format_bits(&arm_spe_pmu->format, "ts_enable");
+
+ /* Skip if user has set it */
+ if (bit & user_bits)
+ return;
+
+ evsel->core.attr.config |= bit;
+}
+
static size_t
arm_spe_info_priv_size(struct auxtrace_record *itr __maybe_unused,
struct evlist *evlist __maybe_unused)
@@ -121,9 +145,14 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
*/
evlist__to_front(evlist, arm_spe_evsel);
- /* In the case of per-cpu mmaps, sample CPU for AUX event. */
- if (!perf_cpu_map__empty(cpus))
+ /*
+ * In the case of per-cpu mmaps, sample CPU for AUX event;
+ * also enable the timestamp tracing for samples correlation.
+ */
+ if (!perf_cpu_map__empty(cpus)) {
evsel__set_sample_bit(arm_spe_evsel, CPU);
+ arm_spe_set_timestamp(itr, arm_spe_evsel);
+ }
/* Add dummy event to keep tracking */
err = parse_events(evlist, "dummy:u", NULL);