[PATCH v8 06/10] perf evsel: Assemble offcpu samples

[Howard Chu]

Use the data in bpf-output samples, to assemble offcpu samples.

Suggested-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
Signed-off-by: Howard Chu <howardchu95@xxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20241108204137.2444151-7-howardchu95@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/evsel.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8d0308f62484..654fb5196ecf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2792,6 +2792,35 @@ static inline bool evsel__has_branch_counters(const struct evsel *evsel)
 	return false;
 }
 
+static int __set_offcpu_sample(struct perf_sample *data)
+{
+	u64 *array = data->raw_data;
+	u32 max_size = data->raw_size, *p32;
+	const void *endp = (void *)array + max_size;
+
+	if (array == NULL)
+		return -EFAULT;
+
+	OVERFLOW_CHECK_u64(array);
+	p32 = (void *)array++;
+	data->pid = p32[0];
+	data->tid = p32[1];
+
+	OVERFLOW_CHECK_u64(array);
+	data->period = *array++;
+
+	OVERFLOW_CHECK_u64(array);
+	data->callchain = (struct ip_callchain *)array++;
+	OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size);
+	data->ip = data->callchain->ips[1];
+	array += data->callchain->nr;
+
+	OVERFLOW_CHECK_u64(array);
+	data->cgroup = *array;
+
+	return 0;
+}
+
 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 			struct perf_sample *data)
 {
@@ -3143,6 +3172,9 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 		array = (void *)array + sz;
 	}
 
+	if (evsel__is_offcpu_event(evsel))
+		return __set_offcpu_sample(data);
+
 	return 0;
 }
 
-- 
2.43.0