1// SPDX-License-Identifier: GPL-2.0
  2#include "debug.h"
  3#include "evlist.h"
  4#include "evsel.h"
  5#include "target.h"
  6#include "thread_map.h"
  7#include "tests.h"
  8#include "util/mmap.h"
  9
 10#include <errno.h>
 11#include <signal.h>
 12#include <linux/string.h>
 13#include <perf/cpumap.h>
 14#include <perf/evlist.h>
 15
 16static int exited;
 17static int nr_exit;
 18
 19static void sig_handler(int sig __maybe_unused)
 20{
 21	exited = 1;
 22}
 23
 24/*
 25 * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
 26 * we asked by setting its exec_error to this handler.
 27 */
 28static void workload_exec_failed_signal(int signo __maybe_unused,
 29					siginfo_t *info __maybe_unused,
 30					void *ucontext __maybe_unused)
 31{
 32	exited	= 1;
 33	nr_exit = -1;
 34}
 35
 36/*
 37 * This test will start a workload that does nothing then it checks
 38 * if the number of exit event reported by the kernel is 1 or not
 39 * in order to check the kernel returns correct number of event.
 40 */
 41int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused)
 42{
 43	int err = -1;
 44	union perf_event *event;
 45	struct evsel *evsel;
 46	struct evlist *evlist;
 47	struct target target = {
 48		.uid		= UINT_MAX,
 49		.uses_mmap	= true,
 50	};
 51	const char *argv[] = { "true", NULL };
 52	char sbuf[STRERR_BUFSIZE];
 53	struct perf_cpu_map *cpus;
 54	struct perf_thread_map *threads;
 55	struct mmap *md;
 56
 57	signal(SIGCHLD, sig_handler);
 58
 59	evlist = perf_evlist__new_default();
 60	if (evlist == NULL) {
 61		pr_debug("perf_evlist__new_default\n");
 62		return -1;
 63	}
 64
 65	/*
 66	 * Create maps of threads and cpus to monitor. In this case
 67	 * we start with all threads and cpus (-1, -1) but then in
 68	 * perf_evlist__prepare_workload we'll fill in the only thread
 69	 * we're monitoring, the one forked there.
 70	 */
 71	cpus = perf_cpu_map__dummy_new();
 72	threads = thread_map__new_by_tid(-1);
 73	if (!cpus || !threads) {
 74		err = -ENOMEM;
 75		pr_debug("Not enough memory to create thread/cpu maps\n");
 76		goto out_free_maps;
 77	}
 78
 79	perf_evlist__set_maps(&evlist->core, cpus, threads);
 80
 81	cpus	= NULL;
 82	threads = NULL;
 83
 84	err = perf_evlist__prepare_workload(evlist, &target, argv, false,
 85					    workload_exec_failed_signal);
 86	if (err < 0) {
 87		pr_debug("Couldn't run the workload!\n");
 88		goto out_delete_evlist;
 89	}
 90
 91	evsel = evlist__first(evlist);
 92	evsel->core.attr.task = 1;
 93#ifdef __s390x__
 94	evsel->core.attr.sample_freq = 1000000;
 95#else
 96	evsel->core.attr.sample_freq = 1;
 97#endif
 98	evsel->core.attr.inherit = 0;
 99	evsel->core.attr.watermark = 0;
100	evsel->core.attr.wakeup_events = 1;
101	evsel->core.attr.exclude_kernel = 1;
102
103	err = evlist__open(evlist);
104	if (err < 0) {
105		pr_debug("Couldn't open the evlist: %s\n",
106			 str_error_r(-err, sbuf, sizeof(sbuf)));
107		goto out_delete_evlist;
108	}
109
110	if (evlist__mmap(evlist, 128) < 0) {
111		pr_debug("failed to mmap events: %d (%s)\n", errno,
112			 str_error_r(errno, sbuf, sizeof(sbuf)));
113		goto out_delete_evlist;
114	}
115
116	perf_evlist__start_workload(evlist);
117
118retry:
119	md = &evlist->mmap[0];
120	if (perf_mmap__read_init(md) < 0)
121		goto out_init;
122
123	while ((event = perf_mmap__read_event(md)) != NULL) {
124		if (event->header.type == PERF_RECORD_EXIT)
125			nr_exit++;
126
127		perf_mmap__consume(md);
128	}
129	perf_mmap__read_done(md);
130
131out_init:
132	if (!exited || !nr_exit) {
133		evlist__poll(evlist, -1);
134		goto retry;
135	}
136
137	if (nr_exit != 1) {
138		pr_debug("received %d EXIT records\n", nr_exit);
139		err = -1;
140	}
141
142out_free_maps:
143	perf_cpu_map__put(cpus);
144	perf_thread_map__put(threads);
145out_delete_evlist:
146	evlist__delete(evlist);
147	return err;
148}