perf intel-tpebs: Add support for updating counts in evsel__tpebs_read

Rename to reflect evsel argument and for consistency with other tpebs
functions.

Update count from prev_raw_counts when available.

Eventually this will allow inteval mode support.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Weilin Wang <weilin.wang@intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: Andreas Färber <afaerber@suse.de>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Falcon <thomas.falcon@intel.com>
Link: https://lore.kernel.org/r/20250414174134.3095492-11-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

3 files changed, 25 insertions, 40 deletions

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index c2e0ed7815b0..2079ffab29f8 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1718,11 +1718,6 @@ static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
 	return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
 }
 
-static int evsel__read_retire_lat(struct evsel *evsel, int cpu_map_idx, int thread)
-{
-	return tpebs_set_evsel(evsel, cpu_map_idx, thread);
-}
-
 static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
 			     u64 val, u64 ena, u64 run, u64 lost)
 {
@@ -1730,8 +1725,8 @@ static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
 
 	count = perf_counts(counter->counts, cpu_map_idx, thread);
 
-	if (counter->retire_lat) {
-		evsel__read_retire_lat(counter, cpu_map_idx, thread);
+	if (evsel__is_retire_lat(counter)) {
+		evsel__tpebs_read(counter, cpu_map_idx, thread);
 		perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
 		return;
 	}
@@ -1889,7 +1884,7 @@ int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
 		return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread);
 
 	if (evsel__is_retire_lat(evsel))
-		return evsel__read_retire_lat(evsel, cpu_map_idx, thread);
+		return evsel__tpebs_read(evsel, cpu_map_idx, thread);
 
 	if (evsel->core.attr.read_format & PERF_FORMAT_GROUP)
 		return evsel__read_group(evsel, cpu_map_idx, thread);
diff --git a/tools/perf/util/intel-tpebs.c b/tools/perf/util/intel-tpebs.c
index b48f3692c798..8cbb3b3c0056 100644
--- a/tools/perf/util/intel-tpebs.c
+++ b/tools/perf/util/intel-tpebs.c
@@ -415,49 +415,39 @@ out:
 	return ret;
 }
 
-
-int tpebs_set_evsel(struct evsel *evsel, int cpu_map_idx, int thread)
+int evsel__tpebs_read(struct evsel *evsel, int cpu_map_idx, int thread)
 {
-	__u64 val;
+	struct perf_counts_values *count, *old_count = NULL;
 	struct tpebs_retire_lat *t;
-	struct perf_counts_values *count;
+	uint64_t val;
+
+	/* Only set retire_latency value to the first CPU and thread. */
+	if (cpu_map_idx != 0 || thread != 0)
+		return 0;
+
+	if (evsel->prev_raw_counts)
+		old_count = perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
 
-	/* Non reitre_latency evsel should never enter this function. */
-	if (!evsel__is_retire_lat(evsel))
-		return -1;
+	count = perf_counts(evsel->counts, cpu_map_idx, thread);
 
 	/*
 	 * Need to stop the forked record to ensure get sampled data from the
 	 * PIPE to process and get non-zero retire_lat value for hybrid.
 	 */
 	tpebs_stop();
-	count = perf_counts(evsel->counts, cpu_map_idx, thread);
 
 	t = tpebs_retire_lat__find(evsel);
-
-	/* Set ena and run to non-zero */
-	count->ena = count->run = 1;
-	count->lost = 0;
-
-	if (!t) {
-		/*
-		 * Set default value or 0 when retire_latency for this event is
-		 * not found from sampling data (record_tpebs not set or 0
-		 * sample recorded).
-		 */
-		count->val = 0;
-		return 0;
+	val = rint(t->val);
+
+	if (old_count) {
+		count->val = old_count->val + val;
+		count->run = old_count->run + 1;
+		count->ena = old_count->ena + 1;
+	} else {
+		count->val = val;
+		count->run++;
+		count->ena++;
 	}
-
-	/*
-	 * Only set retire_latency value to the first CPU and thread.
-	 */
-	if (cpu_map_idx == 0 && thread == 0)
-		val = rint(t->val);
-	else
-		val = 0;
-
-	count->val = val;
 	return 0;
 }
 
diff --git a/tools/perf/util/intel-tpebs.h b/tools/perf/util/intel-tpebs.h
index 5c671181ec60..218a82866cee 100644
--- a/tools/perf/util/intel-tpebs.h
+++ b/tools/perf/util/intel-tpebs.h
@@ -12,6 +12,6 @@ extern bool tpebs_recording;
 
 int evsel__tpebs_open(struct evsel *evsel);
 void evsel__tpebs_close(struct evsel *evsel);
-int tpebs_set_evsel(struct evsel *evsel, int cpu_map_idx, int thread);
+int evsel__tpebs_read(struct evsel *evsel, int cpu_map_idx, int thread);
 
 #endif /* __INTEL_TPEBS_H */