1// SPDX-License-Identifier: GPL-2.0 2/* 3 * The struct perf_event_attr test support. 4 * 5 * This test is embedded inside into perf directly and is governed 6 * by the PERF_TEST_ATTR environment variable and hook inside 7 * sys_perf_event_open function. 8 * 9 * The general idea is to store 'struct perf_event_attr' details for 10 * each event created within single perf command. Each event details 11 * are stored into separate text file. Once perf command is finished 12 * these files can be checked for values we expect for command. 13 * 14 * Besides 'struct perf_event_attr' values we also store 'fd' and 15 * '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 write 19 * 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 38#define ENV "PERF_TEST_ATTR" 39 40static char *dir; 41static bool ready; 42 43void test_attr__init(void) 44{ 45 dir = getenv(ENV); 46 test_attr__enabled = (dir != NULL); 47} 48 49#define BUFSIZE 1024 50 51#define __WRITE_ASS(str, fmt, data) \ 52do { \ 53 char buf[BUFSIZE]; \ 54 size_t size; \ 55 \ 56 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \ 57 if (1 != fwrite(buf, size, 1, file)) { \ 58 perror("test attr - failed to write event file"); \ 59 fclose(file); \ 60 return -1; \ 61 } \ 62 \ 63} while (0) 64 65#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 66 67static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, 68 int fd, int group_fd, unsigned long flags) 69{ 70 FILE *file; 71 char path[PATH_MAX]; 72 73 if (!ready) 74 return 0; 75 76 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 77 attr->type, attr->config, fd); 78 79 file = fopen(path, "w+"); 80 if (!file) { 81 perror("test attr - failed to open event file"); 82 return -1; 83 } 84 85 if (fprintf(file, "[event-%d-%llu-%d]\n", 86 attr->type, attr->config, fd) < 0) { 87 perror("test attr - failed to write event file"); 88 fclose(file); 89 return -1; 90 } 91 92 /* syscall arguments */ 93 __WRITE_ASS(fd, "d", fd); 94 __WRITE_ASS(group_fd, "d", group_fd); 95 __WRITE_ASS(cpu, "d", cpu); 96 __WRITE_ASS(pid, "d", pid); 97 __WRITE_ASS(flags, "lu", flags); 98 99 /* struct perf_event_attr */ 100 WRITE_ASS(type, PRIu32); 101 WRITE_ASS(size, PRIu32); 102 WRITE_ASS(config, "llu"); 103 WRITE_ASS(sample_period, "llu"); 104 WRITE_ASS(sample_type, "llu"); 105 WRITE_ASS(read_format, "llu"); 106 WRITE_ASS(disabled, "d"); 107 WRITE_ASS(inherit, "d"); 108 WRITE_ASS(pinned, "d"); 109 WRITE_ASS(exclusive, "d"); 110 WRITE_ASS(exclude_user, "d"); 111 WRITE_ASS(exclude_kernel, "d"); 112 WRITE_ASS(exclude_hv, "d"); 113 WRITE_ASS(exclude_idle, "d"); 114 WRITE_ASS(mmap, "d"); 115 WRITE_ASS(comm, "d"); 116 WRITE_ASS(freq, "d"); 117 WRITE_ASS(inherit_stat, "d"); 118 WRITE_ASS(enable_on_exec, "d"); 119 WRITE_ASS(task, "d"); 120 WRITE_ASS(watermark, "d"); 121 WRITE_ASS(precise_ip, "d"); 122 WRITE_ASS(mmap_data, "d"); 123 WRITE_ASS(sample_id_all, "d"); 124 WRITE_ASS(exclude_host, "d"); 125 WRITE_ASS(exclude_guest, "d"); 126 WRITE_ASS(exclude_callchain_kernel, "d"); 127 WRITE_ASS(exclude_callchain_user, "d"); 128 WRITE_ASS(mmap2, "d"); 129 WRITE_ASS(comm_exec, "d"); 130 WRITE_ASS(context_switch, "d"); 131 WRITE_ASS(write_backward, "d"); 132 WRITE_ASS(namespaces, "d"); 133 WRITE_ASS(use_clockid, "d"); 134 WRITE_ASS(wakeup_events, PRIu32); 135 WRITE_ASS(bp_type, PRIu32); 136 WRITE_ASS(config1, "llu"); 137 WRITE_ASS(config2, "llu"); 138 WRITE_ASS(branch_sample_type, "llu"); 139 WRITE_ASS(sample_regs_user, "llu"); 140 WRITE_ASS(sample_stack_user, PRIu32); 141 142 fclose(file); 143 return 0; 144} 145 146void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, 147 int fd, int group_fd, unsigned long flags) 148{ 149 int errno_saved = errno; 150 151 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) { 152 pr_err("test attr FAILED"); 153 exit(128); 154 } 155 156 errno = errno_saved; 157} 158 159void test_attr__ready(void) 160{ 161 if (unlikely(test_attr__enabled) && !ready) 162 ready = true; 163} 164 165static int run_dir(const char *d, const char *perf) 166{ 167 char v[] = "-vvvvv"; 168 int vcnt = min(verbose, (int) sizeof(v) - 1); 169 char cmd[3*PATH_MAX]; 170 171 if (verbose > 0) 172 vcnt++; 173 174 scnprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s", 175 d, d, perf, vcnt, v); 176 177 return system(cmd) ? TEST_FAIL : TEST_OK; 178} 179 180int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused) 181{ 182 struct stat st; 183 char path_perf[PATH_MAX]; 184 char path_dir[PATH_MAX]; 185 186 /* First try development tree tests. */ 187 if (!lstat("./tests", &st)) 188 return run_dir("./tests", "./perf"); 189 190 /* Then installed path. */ 191 snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path()); 192 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); 193 194 if (!lstat(path_dir, &st) && 195 !lstat(path_perf, &st)) 196 return run_dir(path_dir, path_perf); 197 198 return TEST_SKIP; 199} 200