// 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. */int test__basic_mmap(struct test *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("perf_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] = perf_evsel__newtp("syscalls", name);		if (IS_ERR(evsels[i])) {			pr_debug("perf_evsel__new(%s)\n", name);			goto out_delete_evlist;		} 		evsels[i]->core.attr.wakeup_events = 1;		perf_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 = perf_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 = perf_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->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->idx] != expected_nr_events[evsel->idx]) {			pr_debug("expected %d %s events, got %d\n",				 expected_nr_events[evsel->idx],				 perf_evsel__name(evsel), nr_events[evsel->idx]);			err = -1;			goto out_delete_evlist;		}	} out_delete_evlist:	evlist__delete(evlist);	cpus	= NULL;	threads = NULL;out_free_cpus:	perf_cpu_map__put(cpus);out_free_threads:	perf_thread_map__put(threads);	return err;}