perf auxtrace: Add auxtrace_synth_id_range_start() helper

To avoid hardcoding the offset value for synthetic event IDs
in multiple auxtrace modules (arm-spe, cs-etm, intel-pt, etc.),
and to improve code reusability, this patch unifies
the handling of the ID offset via a dedicated helper function.

Signed-off-by: tanze <tanze@kylinos.cn>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Author: tanze

tools/perf/util/arm-spe.c

@@ -1733,10 +1733,7 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
 	attr.sample_period = spe->synth_opts.period;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (spe->synth_opts.flc) {
 		spe->sample_flc = true;

tools/perf/util/auxtrace.c

@@ -62,6 +62,22 @@
 #include <internal/lib.h>
 #include "util/sample.h"
 
+#define AUXTRACE_SYNTH_EVENT_ID_OFFSET	1000000000ULL
+
+/*
+ * Event IDs are allocated sequentially, so a big offset from any
+ * existing ID will reach a unused range.
+ */
+u64 auxtrace_synth_id_range_start(struct evsel *evsel)
+{
+	u64 id = evsel->core.id[0] + AUXTRACE_SYNTH_EVENT_ID_OFFSET;
+
+	if (!id)
+		id = 1;
+
+	return id;
+}
+
 /*
  * Make a group from 'leader' to 'last', requiring that the events were not
  * already grouped to a different leader.

tools/perf/util/auxtrace.h

@@ -648,6 +648,7 @@ void auxtrace__free_events(struct perf_session *session);
 void auxtrace__free(struct perf_session *session);
 bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
 				 struct evsel *evsel);
+u64 auxtrace_synth_id_range_start(struct evsel *evsel);
 
 #define ITRACE_HELP \
 "				i[period]:    		synthesize instructions events\n" \

tools/perf/util/cs-etm.c

@@ -1726,10 +1726,7 @@ static int cs_etm__synth_events(struct cs_etm_auxtrace *etm,
 	attr.read_format = evsel->core.attr.read_format;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (etm->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;

tools/perf/util/intel-bts.c

@@ -777,9 +777,7 @@ static int intel_bts_synth_events(struct intel_bts *bts,
 	attr.sample_id_all = evsel->core.attr.sample_id_all;
 	attr.read_format = evsel->core.attr.read_format;
 
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (bts->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;

tools/perf/util/intel-pt.c

@@ -3987,9 +3987,7 @@ static int intel_pt_synth_events(struct intel_pt *pt,
 	attr.sample_id_all = evsel->core.attr.sample_id_all;
 	attr.read_format = evsel->core.attr.read_format;
 
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	if (pt->synth_opts.branches) {
 		attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;

tools/perf/util/powerpc-vpadtl.c

@@ -656,9 +656,7 @@ powerpc_vpadtl_synth_events(struct powerpc_vpadtl *vpa, struct perf_session *ses
 	attr.config = PERF_SYNTH_POWERPC_VPA_DTL;
 
 	/* create new id val to be a fixed offset from evsel id */
-	id = evsel->core.id[0] + 1000000000;
-	if (!id)
-		id = 1;
+	id = auxtrace_synth_id_range_start(evsel);
 
 	err = perf_session__deliver_synth_attr_event(session, &attr, id);
 	if (err)