perf tools: Factor out evsel__id_hdr_size()

Factor out evsel__id_hdr_size() so it can be reused.

This is needed by perf inject. When injecting events from a guest perf.data
file, there is a possibility that the sample ID numbers conflict. To
re-write an ID sample, the old one needs to be removed first, which means
determining how big it is with evsel__id_hdr_size() and then subtracting
that from the event size.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: kvm@vger.kernel.org
Link: https://lore.kernel.org/r/20220711093218.10967-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 1 insertions, 27 deletions

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 48af7d379d82..03fbe151b0c4 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1244,34 +1244,8 @@ bool evlist__valid_read_format(struct evlist *evlist)
 u16 evlist__id_hdr_size(struct evlist *evlist)
 {
 	struct evsel *first = evlist__first(evlist);
-	struct perf_sample *data;
-	u64 sample_type;
-	u16 size = 0;
 
-	if (!first->core.attr.sample_id_all)
-		goto out;
-
-	sample_type = first->core.attr.sample_type;
-
-	if (sample_type & PERF_SAMPLE_TID)
-		size += sizeof(data->tid) * 2;
-
-       if (sample_type & PERF_SAMPLE_TIME)
-		size += sizeof(data->time);
-
-	if (sample_type & PERF_SAMPLE_ID)
-		size += sizeof(data->id);
-
-	if (sample_type & PERF_SAMPLE_STREAM_ID)
-		size += sizeof(data->stream_id);
-
-	if (sample_type & PERF_SAMPLE_CPU)
-		size += sizeof(data->cpu) * 2;
-
-	if (sample_type & PERF_SAMPLE_IDENTIFIER)
-		size += sizeof(data->id);
-out:
-	return size;
+	return first->core.attr.sample_id_all ? evsel__id_hdr_size(first) : 0;
 }
 
 bool evlist__valid_sample_id_all(struct evlist *evlist)