v4.19.13 snapshot.
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
new file mode 100644
index 0000000..0919b07
--- /dev/null
+++ b/tools/perf/tests/mmap-basic.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <inttypes.h>
+/* For the CLR_() macros */
+#include <pthread.h>
+
+#include "evlist.h"
+#include "evsel.h"
+#include "thread_map.h"
+#include "cpumap.h"
+#include "tests.h"
+#include <linux/err.h>
+#include <linux/kernel.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 thread_map *threads;
+ struct cpu_map *cpus;
+ struct perf_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 perf_evsel *evsels[nsyscalls], *evsel;
+ char sbuf[STRERR_BUFSIZE];
+ struct perf_mmap *md;
+
+ threads = thread_map__new(-1, getpid(), UINT_MAX);
+ if (threads == NULL) {
+ pr_debug("thread_map__new\n");
+ return -1;
+ }
+
+ cpus = cpu_map__new(NULL);
+ if (cpus == NULL) {
+ pr_debug("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 = perf_evlist__new();
+ if (evlist == NULL) {
+ pr_debug("perf_evlist__new\n");
+ goto out_free_cpus;
+ }
+
+ perf_evlist__set_maps(evlist, 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]->attr.wakeup_events = 1;
+ perf_evsel__set_sample_id(evsels[i], false);
+
+ perf_evlist__add(evlist, evsels[i]);
+
+ if (perf_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 (perf_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) < 0)
+ goto out_init;
+
+ while ((event = perf_mmap__read_event(md)) != 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);
+ }
+ perf_mmap__read_done(md);
+
+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:
+ perf_evlist__delete(evlist);
+ cpus = NULL;
+ threads = NULL;
+out_free_cpus:
+ cpu_map__put(cpus);
+out_free_threads:
+ thread_map__put(threads);
+ return err;
+}