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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /tools/perf/tests/mmap-basic.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/tests/mmap-basic.c')
-rw-r--r--tools/perf/tests/mmap-basic.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
new file mode 100644
index 000000000..8322fc229
--- /dev/null
+++ b/tools/perf/tests/mmap-basic.c
@@ -0,0 +1,305 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <errno.h>
+#include <inttypes.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 = TEST_FAIL;
+ 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(perf_cpu_map__cpu(cpus, 0).cpu, &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 ",
+ perf_cpu_map__cpu(cpus, 0).cpu,
+ 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);
+ if (PTR_ERR(evsels[i]) == -EACCES) {
+ /* Permissions failure, flag the failure as a skip. */
+ err = TEST_SKIP;
+ }
+ 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) {
+ syscalls[i]();
+ }
+
+ 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;
+}
+
+static int test_stat_user_read(int event)
+{
+ struct perf_counts_values counts = { .val = 0 };
+ struct perf_thread_map *threads;
+ struct perf_evsel *evsel;
+ struct perf_event_mmap_page *pc;
+ struct perf_event_attr attr = {
+ .type = PERF_TYPE_HARDWARE,
+ .config = event,
+#ifdef __aarch64__
+ .config1 = 0x2, /* Request user access */
+#endif
+ };
+ int err, i, ret = TEST_FAIL;
+ bool opened = false, mapped = false;
+
+ threads = perf_thread_map__new_dummy();
+ TEST_ASSERT_VAL("failed to create threads", threads);
+
+ perf_thread_map__set_pid(threads, 0, 0);
+
+ evsel = perf_evsel__new(&attr);
+ TEST_ASSERT_VAL("failed to create evsel", evsel);
+
+ err = perf_evsel__open(evsel, NULL, threads);
+ if (err) {
+ pr_err("failed to open evsel: %s\n", strerror(-err));
+ ret = TEST_SKIP;
+ goto out;
+ }
+ opened = true;
+
+ err = perf_evsel__mmap(evsel, 0);
+ if (err) {
+ pr_err("failed to mmap evsel: %s\n", strerror(-err));
+ goto out;
+ }
+ mapped = true;
+
+ pc = perf_evsel__mmap_base(evsel, 0, 0);
+ if (!pc) {
+ pr_err("failed to get mmapped address\n");
+ goto out;
+ }
+
+ if (!pc->cap_user_rdpmc || !pc->index) {
+ pr_err("userspace counter access not %s\n",
+ !pc->cap_user_rdpmc ? "supported" : "enabled");
+ ret = TEST_SKIP;
+ goto out;
+ }
+ if (pc->pmc_width < 32) {
+ pr_err("userspace counter width not set (%d)\n", pc->pmc_width);
+ goto out;
+ }
+
+ perf_evsel__read(evsel, 0, 0, &counts);
+ if (counts.val == 0) {
+ pr_err("failed to read value for evsel\n");
+ goto out;
+ }
+
+ for (i = 0; i < 5; i++) {
+ volatile int count = 0x10000 << i;
+ __u64 start, end, last = 0;
+
+ pr_debug("\tloop = %u, ", count);
+
+ perf_evsel__read(evsel, 0, 0, &counts);
+ start = counts.val;
+
+ while (count--) ;
+
+ perf_evsel__read(evsel, 0, 0, &counts);
+ end = counts.val;
+
+ if ((end - start) < last) {
+ pr_err("invalid counter data: end=%llu start=%llu last= %llu\n",
+ end, start, last);
+ goto out;
+ }
+ last = end - start;
+ pr_debug("count = %llu\n", end - start);
+ }
+ ret = TEST_OK;
+
+out:
+ if (mapped)
+ perf_evsel__munmap(evsel);
+ if (opened)
+ perf_evsel__close(evsel);
+ perf_evsel__delete(evsel);
+
+ perf_thread_map__put(threads);
+ return ret;
+}
+
+static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused,
+ int subtest __maybe_unused)
+{
+ return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);
+}
+
+static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused,
+ int subtest __maybe_unused)
+{
+ return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);
+}
+
+static struct test_case tests__basic_mmap[] = {
+ TEST_CASE_REASON("Read samples using the mmap interface",
+ basic_mmap,
+ "permissions"),
+ TEST_CASE_REASON("User space counter reading of instructions",
+ mmap_user_read_instr,
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
+ "permissions"
+#else
+ "unsupported"
+#endif
+ ),
+ TEST_CASE_REASON("User space counter reading of cycles",
+ mmap_user_read_cycles,
+#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__)
+ "permissions"
+#else
+ "unsupported"
+#endif
+ ),
+ { .name = NULL, }
+};
+
+struct test_suite suite__basic_mmap = {
+ .desc = "mmap interface tests",
+ .test_cases = tests__basic_mmap,
+};