310 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <errno.h>3#include <inttypes.h>4#include <stdlib.h>5#include <perf/cpumap.h>6 7#include "debug.h"8#include "event.h"9#include "evlist.h"10#include "evsel.h"11#include "thread_map.h"12#include "tests.h"13#include "util/mmap.h"14#include "util/sample.h"15#include <linux/err.h>16#include <linux/kernel.h>17#include <linux/string.h>18#include <perf/evlist.h>19#include <perf/mmap.h>20 21/*22 * This test will generate random numbers of calls to some getpid syscalls,23 * then establish an mmap for a group of events that are created to monitor24 * the syscalls.25 *26 * It will receive the events, using mmap, use its PERF_SAMPLE_ID generated27 * sample.id field to map back to its respective perf_evsel instance.28 *29 * Then it checks if the number of syscalls reported as perf events by30 * the kernel corresponds to the number of syscalls made.31 */32static int test__basic_mmap(struct test_suite *test __maybe_unused, int subtest __maybe_unused)33{34 int err = TEST_FAIL;35 union perf_event *event;36 struct perf_thread_map *threads;37 struct perf_cpu_map *cpus;38 struct evlist *evlist;39 cpu_set_t cpu_set;40 const char *syscall_names[] = { "getsid", "getppid", "getpgid", };41 pid_t (*syscalls[])(void) = { (void *)getsid, getppid, (void*)getpgid };42#define nsyscalls ARRAY_SIZE(syscall_names)43 unsigned int nr_events[nsyscalls],44 expected_nr_events[nsyscalls], i, j;45 struct evsel *evsels[nsyscalls], *evsel;46 char sbuf[STRERR_BUFSIZE];47 struct mmap *md;48 49 threads = thread_map__new(-1, getpid(), UINT_MAX);50 if (threads == NULL) {51 pr_debug("thread_map__new\n");52 return -1;53 }54 55 cpus = perf_cpu_map__new_online_cpus();56 if (cpus == NULL) {57 pr_debug("perf_cpu_map__new\n");58 goto out_free_threads;59 }60 61 CPU_ZERO(&cpu_set);62 CPU_SET(perf_cpu_map__cpu(cpus, 0).cpu, &cpu_set);63 sched_setaffinity(0, sizeof(cpu_set), &cpu_set);64 if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {65 pr_debug("sched_setaffinity() failed on CPU %d: %s ",66 perf_cpu_map__cpu(cpus, 0).cpu,67 str_error_r(errno, sbuf, sizeof(sbuf)));68 goto out_free_cpus;69 }70 71 evlist = evlist__new();72 if (evlist == NULL) {73 pr_debug("evlist__new\n");74 goto out_free_cpus;75 }76 77 perf_evlist__set_maps(&evlist->core, cpus, threads);78 79 for (i = 0; i < nsyscalls; ++i) {80 char name[64];81 82 snprintf(name, sizeof(name), "sys_enter_%s", syscall_names[i]);83 evsels[i] = evsel__newtp("syscalls", name);84 if (IS_ERR(evsels[i])) {85 pr_debug("evsel__new(%s)\n", name);86 if (PTR_ERR(evsels[i]) == -EACCES) {87 /* Permissions failure, flag the failure as a skip. */88 err = TEST_SKIP;89 }90 goto out_delete_evlist;91 }92 93 evsels[i]->core.attr.wakeup_events = 1;94 evsel__set_sample_id(evsels[i], false);95 96 evlist__add(evlist, evsels[i]);97 98 if (evsel__open(evsels[i], cpus, threads) < 0) {99 pr_debug("failed to open counter: %s, "100 "tweak /proc/sys/kernel/perf_event_paranoid?\n",101 str_error_r(errno, sbuf, sizeof(sbuf)));102 goto out_delete_evlist;103 }104 105 nr_events[i] = 0;106 expected_nr_events[i] = 1 + rand() % 127;107 }108 109 if (evlist__mmap(evlist, 128) < 0) {110 pr_debug("failed to mmap events: %d (%s)\n", errno,111 str_error_r(errno, sbuf, sizeof(sbuf)));112 goto out_delete_evlist;113 }114 115 for (i = 0; i < nsyscalls; ++i)116 for (j = 0; j < expected_nr_events[i]; ++j) {117 syscalls[i]();118 }119 120 md = &evlist->mmap[0];121 if (perf_mmap__read_init(&md->core) < 0)122 goto out_init;123 124 while ((event = perf_mmap__read_event(&md->core)) != NULL) {125 struct perf_sample sample;126 127 if (event->header.type != PERF_RECORD_SAMPLE) {128 pr_debug("unexpected %s event\n",129 perf_event__name(event->header.type));130 goto out_delete_evlist;131 }132 133 err = evlist__parse_sample(evlist, event, &sample);134 if (err) {135 pr_err("Can't parse sample, err = %d\n", err);136 goto out_delete_evlist;137 }138 139 err = -1;140 evsel = evlist__id2evsel(evlist, sample.id);141 if (evsel == NULL) {142 pr_debug("event with id %" PRIu64143 " doesn't map to an evsel\n", sample.id);144 goto out_delete_evlist;145 }146 nr_events[evsel->core.idx]++;147 perf_mmap__consume(&md->core);148 }149 perf_mmap__read_done(&md->core);150 151out_init:152 err = 0;153 evlist__for_each_entry(evlist, evsel) {154 if (nr_events[evsel->core.idx] != expected_nr_events[evsel->core.idx]) {155 pr_debug("expected %d %s events, got %d\n",156 expected_nr_events[evsel->core.idx],157 evsel__name(evsel), nr_events[evsel->core.idx]);158 err = -1;159 goto out_delete_evlist;160 }161 }162 163out_delete_evlist:164 evlist__delete(evlist);165out_free_cpus:166 perf_cpu_map__put(cpus);167out_free_threads:168 perf_thread_map__put(threads);169 return err;170}171 172static int test_stat_user_read(int event)173{174 struct perf_counts_values counts = { .val = 0 };175 struct perf_thread_map *threads;176 struct perf_evsel *evsel;177 struct perf_event_mmap_page *pc;178 struct perf_event_attr attr = {179 .type = PERF_TYPE_HARDWARE,180 .config = event,181#ifdef __aarch64__182 .config1 = 0x2, /* Request user access */183#endif184 };185 int err, i, ret = TEST_FAIL;186 bool opened = false, mapped = false;187 188 threads = perf_thread_map__new_dummy();189 TEST_ASSERT_VAL("failed to create threads", threads);190 191 perf_thread_map__set_pid(threads, 0, 0);192 193 evsel = perf_evsel__new(&attr);194 TEST_ASSERT_VAL("failed to create evsel", evsel);195 196 err = perf_evsel__open(evsel, NULL, threads);197 if (err) {198 pr_err("failed to open evsel: %s\n", strerror(-err));199 ret = TEST_SKIP;200 goto out;201 }202 opened = true;203 204 err = perf_evsel__mmap(evsel, 0);205 if (err) {206 pr_err("failed to mmap evsel: %s\n", strerror(-err));207 goto out;208 }209 mapped = true;210 211 pc = perf_evsel__mmap_base(evsel, 0, 0);212 if (!pc) {213 pr_err("failed to get mmapped address\n");214 goto out;215 }216 217 if (!pc->cap_user_rdpmc || !pc->index) {218 pr_err("userspace counter access not %s\n",219 !pc->cap_user_rdpmc ? "supported" : "enabled");220 ret = TEST_SKIP;221 goto out;222 }223 if (pc->pmc_width < 32) {224 pr_err("userspace counter width not set (%d)\n", pc->pmc_width);225 goto out;226 }227 228 perf_evsel__read(evsel, 0, 0, &counts);229 if (counts.val == 0) {230 pr_err("failed to read value for evsel\n");231 goto out;232 }233 234 for (i = 0; i < 5; i++) {235 volatile int count = 0x10000 << i;236 __u64 start, end, last = 0;237 238 pr_debug("\tloop = %u, ", count);239 240 perf_evsel__read(evsel, 0, 0, &counts);241 start = counts.val;242 243 while (count--) ;244 245 perf_evsel__read(evsel, 0, 0, &counts);246 end = counts.val;247 248 if ((end - start) < last) {249 pr_err("invalid counter data: end=%llu start=%llu last= %llu\n",250 end, start, last);251 goto out;252 }253 last = end - start;254 pr_debug("count = %llu\n", end - start);255 }256 ret = TEST_OK;257 258out:259 if (mapped)260 perf_evsel__munmap(evsel);261 if (opened)262 perf_evsel__close(evsel);263 perf_evsel__delete(evsel);264 265 perf_thread_map__put(threads);266 return ret;267}268 269static int test__mmap_user_read_instr(struct test_suite *test __maybe_unused,270 int subtest __maybe_unused)271{272 return test_stat_user_read(PERF_COUNT_HW_INSTRUCTIONS);273}274 275static int test__mmap_user_read_cycles(struct test_suite *test __maybe_unused,276 int subtest __maybe_unused)277{278 return test_stat_user_read(PERF_COUNT_HW_CPU_CYCLES);279}280 281static struct test_case tests__basic_mmap[] = {282 TEST_CASE_REASON("Read samples using the mmap interface",283 basic_mmap,284 "permissions"),285 TEST_CASE_REASON("User space counter reading of instructions",286 mmap_user_read_instr,287#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \288 (defined(__riscv) && __riscv_xlen == 64)289 "permissions"290#else291 "unsupported"292#endif293 ),294 TEST_CASE_REASON("User space counter reading of cycles",295 mmap_user_read_cycles,296#if defined(__i386__) || defined(__x86_64__) || defined(__aarch64__) || \297 (defined(__riscv) && __riscv_xlen == 64)298 "permissions"299#else300 "unsupported"301#endif302 ),303 { .name = NULL, }304};305 306struct test_suite suite__basic_mmap = {307 .desc = "mmap interface tests",308 .test_cases = tests__basic_mmap,309};310