Contributors: 13
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Ian Rogers |
591 |
39.58% |
7 |
9.33% |
| Arnaldo Carvalho de Melo |
557 |
37.31% |
33 |
44.00% |
| Jiri Olsa |
227 |
15.20% |
24 |
32.00% |
| Kan Liang |
37 |
2.48% |
1 |
1.33% |
| Masami Hiramatsu |
27 |
1.81% |
1 |
1.33% |
| Alexandre Ghiti |
24 |
1.61% |
1 |
1.33% |
| Han Pingtian |
10 |
0.67% |
1 |
1.33% |
| Namhyung Kim |
5 |
0.33% |
1 |
1.33% |
| Adrian Hunter |
5 |
0.33% |
2 |
2.67% |
| Alexander Yarygin |
3 |
0.20% |
1 |
1.33% |
| Ingo Molnar |
3 |
0.20% |
1 |
1.33% |
| Zhouyi Zhou |
3 |
0.20% |
1 |
1.33% |
| Greg Kroah-Hartman |
1 |
0.07% |
1 |
1.33% |
| Total |
1493 |
|
75 |
|
// 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_online_cpus();
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__) || \
(defined(__riscv) && __riscv_xlen == 64)
"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__) || \
(defined(__riscv) && __riscv_xlen == 64)
"permissions"
#else
"unsupported"
#endif
),
{ .name = NULL, }
};
struct test_suite suite__basic_mmap = {
.desc = "mmap interface tests",
.test_cases = tests__basic_mmap,
};