1 // SPDX-License-Identifier: GPL-2.0
4 /* For the CLR_() macros */
7 #include <perf/cpumap.h>
12 #include "thread_map.h"
14 #include "util/mmap.h"
15 #include <linux/err.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
18 #include <perf/evlist.h>
19 #include <perf/mmap.h>
22 * This test will generate random numbers of calls to some getpid syscalls,
23 * then establish an mmap for a group of events that are created to monitor
26 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
27 * sample.id field to map back to its respective perf_evsel instance.
29 * Then it checks if the number of syscalls reported as perf events by
30 * the kernel corresponds to the number of syscalls made.
32 static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
35 union perf_event *event;
36 struct perf_thread_map *threads;
37 struct perf_cpu_map *cpus;
38 struct evlist *evlist;
40 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
41 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
42 #define nsyscalls ARRAY_SIZE(syscall_names)
43 unsigned int nr_events[nsyscalls],
44 expected_nr_events[nsyscalls], i, j;
45 struct evsel *evsels[nsyscalls], *evsel;
46 char sbuf[STRERR_BUFSIZE];
49 threads = thread_map__new(-1, getpid(), UINT_MAX);
50 if (threads == NULL) {
51 pr_debug("thread_map__new\n");
55 cpus = perf_cpu_map__new(NULL);
57 pr_debug("perf_cpu_map__new\n");
58 goto out_free_threads;
62 CPU_SET(perf_cpu_map__cpu(cpus, 0).cpu, &cpu_set);
63 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
64 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
65 pr_debug("sched_setaffinity() failed on CPU %d: %s ",
66 perf_cpu_map__cpu(cpus, 0).cpu,
67 str_error_r(errno, sbuf, sizeof(sbuf)));
71 evlist = evlist__new();
73 pr_debug("evlist__new\n");
77 perf_evlist__set_maps(&evlist->core, cpus, threads);
79 for (i = 0; i < nsyscalls; ++i) {
82 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
83 evsels[i] = evsel__newtp("syscalls", name);
84 if (IS_ERR(evsels[i])) {
85 pr_debug("evsel__new(%s)\n", name);
86 if (PTR_ERR(evsels[i]) == -EACCES) {
87 /* Permissions failure, flag the failure as a skip. */
90 goto out_delete_evlist;
93 evsels[i]->core.attr.wakeup_events = 1;
94 evsel__set_sample_id(evsels[i], false);
96 evlist__add(evlist, evsels[i]);
98 if (evsel__open(evsels[i], cpus, threads) < 0) {
99 pr_debug("failed to open counter: %s, "
100 "tweak /proc/sys/kernel/perf_event_paranoid?\n",
101 str_error_r(errno, sbuf, sizeof(sbuf)));
102 goto out_delete_evlist;
106 expected_nr_events[i] = 1 + rand() % 127;
109 if (evlist__mmap(evlist, 128) < 0) {
110 pr_debug("failed to mmap events: %d (%s)\n", errno,
111 str_error_r(errno, sbuf, sizeof(sbuf)));
112 goto out_delete_evlist;
115 for (i = 0; i < nsyscalls; ++i)
116 for (j = 0; j < expected_nr_events[i]; ++j) {
117 int foo = syscalls[i]();
121 md = &evlist->mmap[0];
122 if (perf_mmap__read_init(&md->core) < 0)
125 while ((event = perf_mmap__read_event(&md->core)) != NULL) {
126 struct perf_sample sample;
128 if (event->header.type != PERF_RECORD_SAMPLE) {
129 pr_debug("unexpected %s event\n",
130 perf_event__name(event->header.type));
131 goto out_delete_evlist;
134 err = evlist__parse_sample(evlist, event, &sample);
136 pr_err("Can't parse sample, err = %d\n", err);
137 goto out_delete_evlist;
141 evsel = evlist__id2evsel(evlist, sample.id);
143 pr_debug("event with id %" PRIu64
144 " doesn't map to an evsel\n", sample.id);
145 goto out_delete_evlist;
147 nr_events[evsel->core.idx]++;
148 perf_mmap__consume(&md->core);
150 perf_mmap__read_done(&md->core);
154 evlist__for_each_entry(evlist, evsel) {
155 if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) {
156 pr_debug("expected %d %s events, got %d\n",
157 expected_nr_events[evsel->core.idx],
158 evsel__name(evsel), nr_events[evsel->core.idx]);
160 goto out_delete_evlist;
165 evlist__delete(evlist);
167 perf_cpu_map__put(cpus);
169 perf_thread_map__put(threads);
173 static struct test_case tests__basic_mmap[] = {
174 TEST_CASE_REASON("Read samples using the mmap interface",
180 struct test_suite suite__basic_mmap = {
181 .desc = "Read samples using the mmap interface",
182 .test_cases = tests__basic_mmap,