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1// SPDX-License-Identifier: GPL-2.02/*3 * The struct perf_event_attr test support.4 *5 * This test is embedded inside into perf directly and is governed6 * by the PERF_TEST_ATTR environment variable and hook inside7 * sys_perf_event_open function.8 *9 * The general idea is to store 'struct perf_event_attr' details for10 * each event created within single perf command. Each event details11 * are stored into separate text file. Once perf command is finished12 * these files can be checked for values we expect for command.13 *14 * Besides 'struct perf_event_attr' values we also store 'fd' and15 * 'group_fd' values to allow checking for groups created.16 *17 * This all is triggered by setting PERF_TEST_ATTR environment variable.18 * It must contain name of existing directory with access and write19 * permissions. All the event text files are stored there.20 */21 22#include <debug.h>23#include <errno.h>24#include <inttypes.h>25#include <stdlib.h>26#include <stdio.h>27#include <linux/types.h>28#include <linux/kernel.h>29#include <sys/param.h>30#include <sys/types.h>31#include <sys/stat.h>32#include <unistd.h>33#include <subcmd/exec-cmd.h>34#include "event.h"35#include "util.h"36#include "tests.h"37#include "pmus.h"38 39#define ENV "PERF_TEST_ATTR"40 41static char *dir;42static bool ready;43 44void test_attr__init(void)45{46 dir = getenv(ENV);47 test_attr__enabled = (dir != NULL);48}49 50#define BUFSIZE 102451 52#define __WRITE_ASS(str, fmt, data) \53do { \54 char buf[BUFSIZE]; \55 size_t size; \56 \57 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \58 if (1 != fwrite(buf, size, 1, file)) { \59 perror("test attr - failed to write event file"); \60 fclose(file); \61 return -1; \62 } \63 \64} while (0)65 66#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)67 68static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,69 int fd, int group_fd, unsigned long flags)70{71 FILE *file;72 char path[PATH_MAX];73 74 if (!ready)75 return 0;76 77 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,78 attr->type, attr->config, fd);79 80 file = fopen(path, "w+");81 if (!file) {82 perror("test attr - failed to open event file");83 return -1;84 }85 86 if (fprintf(file, "[event-%d-%llu-%d]\n",87 attr->type, attr->config, fd) < 0) {88 perror("test attr - failed to write event file");89 fclose(file);90 return -1;91 }92 93 /* syscall arguments */94 __WRITE_ASS(fd, "d", fd);95 __WRITE_ASS(group_fd, "d", group_fd);96 __WRITE_ASS(cpu, "d", cpu.cpu);97 __WRITE_ASS(pid, "d", pid);98 __WRITE_ASS(flags, "lu", flags);99 100 /* struct perf_event_attr */101 WRITE_ASS(type, PRIu32);102 WRITE_ASS(size, PRIu32);103 WRITE_ASS(config, "llu");104 WRITE_ASS(sample_period, "llu");105 WRITE_ASS(sample_type, "llu");106 WRITE_ASS(read_format, "llu");107 WRITE_ASS(disabled, "d");108 WRITE_ASS(inherit, "d");109 WRITE_ASS(pinned, "d");110 WRITE_ASS(exclusive, "d");111 WRITE_ASS(exclude_user, "d");112 WRITE_ASS(exclude_kernel, "d");113 WRITE_ASS(exclude_hv, "d");114 WRITE_ASS(exclude_idle, "d");115 WRITE_ASS(mmap, "d");116 WRITE_ASS(comm, "d");117 WRITE_ASS(freq, "d");118 WRITE_ASS(inherit_stat, "d");119 WRITE_ASS(enable_on_exec, "d");120 WRITE_ASS(task, "d");121 WRITE_ASS(watermark, "d");122 WRITE_ASS(precise_ip, "d");123 WRITE_ASS(mmap_data, "d");124 WRITE_ASS(sample_id_all, "d");125 WRITE_ASS(exclude_host, "d");126 WRITE_ASS(exclude_guest, "d");127 WRITE_ASS(exclude_callchain_kernel, "d");128 WRITE_ASS(exclude_callchain_user, "d");129 WRITE_ASS(mmap2, "d");130 WRITE_ASS(comm_exec, "d");131 WRITE_ASS(context_switch, "d");132 WRITE_ASS(write_backward, "d");133 WRITE_ASS(namespaces, "d");134 WRITE_ASS(use_clockid, "d");135 WRITE_ASS(wakeup_events, PRIu32);136 WRITE_ASS(bp_type, PRIu32);137 WRITE_ASS(config1, "llu");138 WRITE_ASS(config2, "llu");139 WRITE_ASS(branch_sample_type, "llu");140 WRITE_ASS(sample_regs_user, "llu");141 WRITE_ASS(sample_stack_user, PRIu32);142 143 fclose(file);144 return 0;145}146 147void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,148 int fd, int group_fd, unsigned long flags)149{150 int errno_saved = errno;151 152 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {153 pr_err("test attr FAILED");154 exit(128);155 }156 157 errno = errno_saved;158}159 160void test_attr__ready(void)161{162 if (unlikely(test_attr__enabled) && !ready)163 ready = true;164}165 166static int run_dir(const char *d, const char *perf)167{168 char v[] = "-vvvvv";169 int vcnt = min(verbose, (int) sizeof(v) - 1);170 char cmd[3*PATH_MAX];171 172 if (verbose > 0)173 vcnt++;174 175 scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s",176 d, d, perf, vcnt, v);177 178 return system(cmd) ? TEST_FAIL : TEST_OK;179}180 181static int test__attr(struct test_suite *test __maybe_unused, int subtest __maybe_unused)182{183 struct stat st;184 char path_perf[PATH_MAX];185 char path_dir[PATH_MAX];186 char *exec_path;187 188 if (perf_pmus__num_core_pmus() > 1) {189 /*190 * TODO: Attribute tests hard code the PMU type. If there are >1191 * core PMU then each PMU will have a different type which192 * requires additional support.193 */194 pr_debug("Skip test on hybrid systems");195 return TEST_SKIP;196 }197 198 /* First try development tree tests. */199 if (!lstat("./tests", &st))200 return run_dir("./tests", "./perf");201 202 exec_path = get_argv_exec_path();203 if (exec_path == NULL)204 return -1;205 206 /* Then installed path. */207 snprintf(path_dir, PATH_MAX, "%s/tests", exec_path);208 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR);209 free(exec_path);210 211 if (!lstat(path_dir, &st) &&212 !lstat(path_perf, &st))213 return run_dir(path_dir, path_perf);214 215 return TEST_SKIP;216}217 218DEFINE_SUITE("Setup struct perf_event_attr", attr);219