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// SPDX-License-Identifier: GPL-2.0
#include <errno.h>
#include <inttypes.h>
/* For the CLR_() macros */
#include <pthread.h>
#include <stdlib.h>
#include <perf/cpumap.h>
#include "debug.h"
#include "evlist.h"
#include "evsel.h"
#include "thread_map.h"
#include "tests.h"
#include "util/mmap.h"
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <perf/evlist.h>
#include <perf/mmap.h>
/*
* This test will generate random numbers of calls to some getpid syscalls,
* then establish an mmap for a group of events that are created to monitor
* the syscalls.
*
* It will receive the events, using mmap, use its PERF_SAMPLE_ID generated
* sample.id field to map back to its respective perf_evsel instance.
*
* Then it checks if the number of syscalls reported as perf events by
* the kernel corresponds to the number of syscalls made.
*/
static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
{
int err = -1;
union perf_event *event;
struct perf_thread_map *threads;
struct perf_cpu_map *cpus;
struct evlist *evlist;
cpu_set_t cpu_set;
const char *syscall_names[] = { "getsid", "getppid", "getpgid", };
pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };
#define nsyscalls ARRAY_SIZE(syscall_names)
unsigned int nr_events[nsyscalls],
expected_nr_events[nsyscalls], i, j;
struct evsel *evsels[nsyscalls], *evsel;
char sbuf[STRERR_BUFSIZE];
struct mmap *md;
threads = thread_map__new(-1, getpid(), UINT_MAX);
if (threads == NULL) {
pr_debug("thread_map__new\n");
return -1;
}
cpus = perf_cpu_map__new(NULL);
if (cpus == NULL) {
pr_debug("perf_cpu_map__new\n");
goto out_free_threads;
}
CPU_ZERO(&cpu_set);
CPU_SET(cpus->map[0], &cpu_set);
sched_setaffinity(0, sizeof(cpu_set), &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
pr_debug("sched_setaffinity() failed on CPU %d: %s ",
cpus->map[0], str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_free_cpus;
}
evlist = evlist__new();
if (evlist == NULL) {
pr_debug("evlist__new\n");
goto out_free_cpus;
}
perf_evlist__set_maps(&evlist->core, cpus, threads);
for (i = 0; i < nsyscalls; ++i) {
char name[64];
snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);
evsels[i] = evsel__newtp("syscalls", name);
if (IS_ERR(evsels[i])) {
pr_debug("evsel__new(%s)\n", name);
goto out_delete_evlist;
}
evsels[i]->core.attr.wakeup_events = 1;
evsel__set_sample_id(evsels[i], false);
evlist__add(evlist, evsels[i]);
if (evsel__open(evsels[i], cpus, threads) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_delete_evlist;
}
nr_events[i] = 0;
expected_nr_events[i] = 1 + rand() % 127;
}
if (evlist__mmap(evlist, 128) < 0) {
pr_debug("failed to mmap events: %d (%s)\n", errno,
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_delete_evlist;
}
for (i = 0; i < nsyscalls; ++i)
for (j = 0; j < expected_nr_events[i]; ++j) {
int foo = syscalls[i]();
++foo;
}
md = &evlist->mmap[0];
if (perf_mmap__read_init(&md->core) < 0)
goto out_init;
while ((event = perf_mmap__read_event(&md->core)) != NULL) {
struct perf_sample sample;
if (event->header.type != PERF_RECORD_SAMPLE) {
pr_debug("unexpected %s event\n",
perf_event__name(event->header.type));
goto out_delete_evlist;
}
err = evlist__parse_sample(evlist, event, &sample);
if (err) {
pr_err("Can't parse sample, err = %d\n", err);
goto out_delete_evlist;
}
err = -1;
evsel = evlist__id2evsel(evlist, sample.id);
if (evsel == NULL) {
pr_debug("event with id %" PRIu64
" doesn't map to an evsel\n", sample.id);
goto out_delete_evlist;
}
nr_events[evsel->core.idx]++;
perf_mmap__consume(&md->core);
}
perf_mmap__read_done(&md->core);
out_init:
err = 0;
evlist__for_each_entry(evlist, evsel) {
if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) {
pr_debug("expected %d %s events, got %d\n",
expected_nr_events[evsel->core.idx],
evsel__name(evsel), nr_events[evsel->core.idx]);
err = -1;
goto out_delete_evlist;
}
}
out_delete_evlist:
evlist__delete(evlist);
out_free_cpus:
perf_cpu_map__put(cpus);
out_free_threads:
perf_thread_map__put(threads);
return err;
}
DEFINE_SUITE("Read samples using the mmap interface", basic_mmap);
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