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 #include "pmus.h" 38 39 #define ENV "PERF_TEST_ATTR" 40 41 static char *dir; 42 static bool ready; 43 44 void test_attr__init(void) 45 { 46 dir = getenv(ENV); 47 test_attr__enabled = (dir != NULL); 48 } 49 50 #define BUFSIZE 1024 51 52 #define __WRITE_ASS(str, fmt, data) \ 53 do { \ 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 68 static 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 } 146 147 void 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 } 159 160 void test_attr__ready(void) 161 { 162 if (unlikely(test_attr__enabled) && !ready) 163 ready = true; 164 } 165 166 static 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 } 180 181 static 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 >1 191 * core PMU then each PMU will have a different type whic 192 * 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 } 217 218 DEFINE_SUITE("Setup struct perf_event_attr", attr); 219