// SPDX-License-Identifier: GPL-2.0
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#include <errno.h>
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#include <inttypes.h>
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/* For the CLR_() macros */
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#include <pthread.h>
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#include "evlist.h"
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#include "evsel.h"
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#include "thread_map.h"
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#include "cpumap.h"
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#include "tests.h"
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#include <linux/err.h>
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#include <linux/kernel.h>
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/*
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* This test will generate random numbers of calls to some getpid syscalls,
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* then establish an mmap for a group of events that are created to monitor
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* the syscalls.
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*
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* It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
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* sample.id field to map back to its respective perf_evsel instance.
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*
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* Then it checks if the number of syscalls reported as perf events by
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* the kernel corresponds to the number of syscalls made.
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*/
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int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unused)
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{
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int err = -1;
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union perf_event *event;
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struct thread_map *threads;
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struct cpu_map *cpus;
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struct perf_evlist *evlist;
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cpu_set_t cpu_set;
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const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
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pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
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#define nsyscalls ARRAY_SIZE(syscall_names)
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unsigned int nr_events[nsyscalls],
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expected_nr_events[nsyscalls], i, j;
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struct perf_evsel *evsels[nsyscalls], *evsel;
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char sbuf[STRERR_BUFSIZE];
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struct perf_mmap *md;
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threads = thread_map__new(-1, getpid(), UINT_MAX);
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if (threads == NULL) {
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pr_debug("thread_map__new\n");
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return -1;
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}
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cpus = cpu_map__new(NULL);
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if (cpus == NULL) {
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pr_debug("cpu_map__new\n");
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goto out_free_threads;
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}
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CPU_ZERO(&cpu_set);
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CPU_SET(cpus->map[0], &cpu_set);
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sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
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if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
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pr_debug("sched_setaffinity() failed on CPU %d: %s ",
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cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_free_cpus;
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}
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evlist = perf_evlist__new();
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if (evlist == NULL) {
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pr_debug("perf_evlist__new\n");
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goto out_free_cpus;
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}
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perf_evlist__set_maps(evlist, cpus, threads);
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for (i = 0; i < nsyscalls; ++i) {
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char name[64];
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snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
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evsels[i] = perf_evsel__newtp("syscalls", name);
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if (IS_ERR(evsels[i])) {
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pr_debug("perf_evsel__new(%s)\n", name);
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goto out_delete_evlist;
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}
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evsels[i]->attr.wakeup_events = 1;
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perf_evsel__set_sample_id(evsels[i], false);
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perf_evlist__add(evlist, evsels[i]);
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if (perf_evsel__open(evsels[i], cpus, threads) < 0) {
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pr_debug("failed to open counter: %s, "
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"tweak /proc/sys/kernel/perf_event_paranoid?\n",
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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nr_events[i] = 0;
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expected_nr_events[i] = 1 + rand() % 127;
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}
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if (perf_evlist__mmap(evlist, 128) < 0) {
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pr_debug("failed to mmap events: %d (%s)\n", errno,
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str_error_r(errno, sbuf, sizeof(sbuf)));
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goto out_delete_evlist;
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}
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for (i = 0; i < nsyscalls; ++i)
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for (j = 0; j < expected_nr_events[i]; ++j) {
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int foo = syscalls[i]();
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++foo;
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}
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md = &evlist->mmap[0];
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if (perf_mmap__read_init(md) < 0)
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goto out_init;
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while ((event = perf_mmap__read_event(md)) != NULL) {
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struct perf_sample sample;
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if (event->header.type != PERF_RECORD_SAMPLE) {
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pr_debug("unexpected %s event\n",
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perf_event__name(event->header.type));
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goto out_delete_evlist;
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}
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err = perf_evlist__parse_sample(evlist, event, &sample);
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if (err) {
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pr_err("Can't parse sample, err = %d\n", err);
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goto out_delete_evlist;
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}
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err = -1;
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evsel = perf_evlist__id2evsel(evlist, sample.id);
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if (evsel == NULL) {
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pr_debug("event with id %" PRIu64
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" doesn't map to an evsel\n", sample.id);
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goto out_delete_evlist;
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}
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nr_events[evsel->idx]++;
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perf_mmap__consume(md);
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}
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perf_mmap__read_done(md);
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out_init:
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err = 0;
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evlist__for_each_entry(evlist, evsel) {
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if (nr_events[evsel->idx] != expected_nr_events[evsel->idx]) {
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pr_debug("expected %d %s events, got %d\n",
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expected_nr_events[evsel->idx],
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perf_evsel__name(evsel), nr_events[evsel->idx]);
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err = -1;
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goto out_delete_evlist;
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}
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}
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out_delete_evlist:
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perf_evlist__delete(evlist);
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cpus = NULL;
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threads = NULL;
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out_free_cpus:
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cpu_map__put(cpus);
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out_free_threads:
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thread_map__put(threads);
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return err;
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}
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