perf evlist: Introduce method to find if there is a bpf-output event

We'll use it in the next patch, to deciding how to set up the ring
buffer.
Signed-off-by: Howard Chu <howardchu95@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240815013626.935097-2-howardchu95@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

@@ -2627,3 +2627,15 @@ void evlist__uniquify_name(struct evlist *evlist)
 		}
 	}
 }
+
+bool evlist__has_bpf_output(struct evlist *evlist)
+{
+	struct evsel *evsel;
+
+	evlist__for_each_entry(evlist, evsel) {
+		if (evsel__is_bpf_output(evsel))
+			return true;
+	}
+
+	return false;
+}

tools/perf/util/evlist.h

@@ -447,5 +447,6 @@ int evlist__scnprintf_evsels(struct evlist *evlist, size_t size, char *bf);
 void evlist__check_mem_load_aux(struct evlist *evlist);
 void evlist__warn_user_requested_cpus(struct evlist *evlist, const char *cpu_list);
 void evlist__uniquify_name(struct evlist *evlist);
+bool evlist__has_bpf_output(struct evlist *evlist);
 
 #endif /* __PERF_EVLIST_H */