evswitch.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2// Copyright (C) 2019, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
 3
 4#include <errno.h>
 5#include "evswitch.h"
 6#include "evlist.h"
 7
 8bool evswitch__discard(struct evswitch *evswitch, struct evsel *evsel)
 9{
10	if (evswitch->on && evswitch->discarding) {
11		if (evswitch->on != evsel)
12			return true;
13
14		evswitch->discarding = false;
15
16		if (!evswitch->show_on_off_events)
17			return true;
18
19		return false;
20	}
21
22	if (evswitch->off && !evswitch->discarding) {
23		if (evswitch->off != evsel)
24			return false;
25
26		evswitch->discarding = true;
27
28		if (!evswitch->show_on_off_events)
29			return true;
30	}
31
32	return false;
33}
34
35static int evswitch__fprintf_enoent(FILE *fp, const char *evtype, const char *evname)
36{
37	int printed = fprintf(fp, "ERROR: switch-%s event not found (%s)\n", evtype, evname);
38
39	return printed += fprintf(fp, "HINT:  use 'perf evlist' to see the available event names\n");
40}
41
42int evswitch__init(struct evswitch *evswitch, struct evlist *evlist, FILE *fp)
43{
44	if (evswitch->on_name) {
45		evswitch->on = evlist__find_evsel_by_str(evlist, evswitch->on_name);
46		if (evswitch->on == NULL) {
47			evswitch__fprintf_enoent(fp, "on", evswitch->on_name);
48			return -ENOENT;
49		}
50		evswitch->discarding = true;
51	}
52
53	if (evswitch->off_name) {
54		evswitch->off = evlist__find_evsel_by_str(evlist, evswitch->off_name);
55		if (evswitch->off == NULL) {
56			evswitch__fprintf_enoent(fp, "off", evswitch->off_name);
57			return -ENOENT;
58		}
59	}
60
61	return 0;
62}