mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
It uses things like perf_event__name() but were not including event.h, where its prototype lives, fix it. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
307 lines
7.6 KiB
C
307 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <stdlib.h>
|
|
#include <perf/cpumap.h>
|
|
|
|
#include "debug.h"
|
|
#include "event.h"
|
|
#include "evlist.h"
|
|
#include "evsel.h"
|
|
#include "thread_map.h"
|
|
#include "tests.h"
|
|
#include "util/mmap.h"
|
|
#include "util/sample.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,
|
|
};
|