1 /* 2 * The struct perf_event_attr test support. 3 * 4 * This test is embedded inside into perf directly and is governed 5 * by the PERF_TEST_ATTR environment variable and hook inside 6 * sys_perf_event_open function. 7 * 8 * The general idea is to store 'struct perf_event_attr' details for 9 * each event created within single perf command. Each event details 10 * are stored into separate text file. Once perf command is finished 11 * these files can be checked for values we expect for command. 12 * 13 * Besides 'struct perf_event_attr' values we also store 'fd' and 14 * 'group_fd' values to allow checking for groups created. 15 * 16 * This all is triggered by setting PERF_TEST_ATTR environment variable. 17 * It must contain name of existing directory with access and write 18 * permissions. All the event text files are stored there. 19 */ 20 21 #include <debug.h> 22 #include <errno.h> 23 #include <inttypes.h> 24 #include <stdlib.h> 25 #include <stdio.h> 26 #include <linux/types.h> 27 #include <linux/kernel.h> 28 #include <sys/param.h> 29 #include <sys/types.h> 30 #include <sys/stat.h> 31 #include <unistd.h> 32 #include "../perf.h" 33 #include <subcmd/exec-cmd.h> 34 #include "tests.h" 35 36 #define ENV "PERF_TEST_ATTR" 37 38 static char *dir; 39 static bool ready; 40 41 void test_attr__init(void) 42 { 43 dir = getenv(ENV); 44 test_attr__enabled = (dir != NULL); 45 } 46 47 #define BUFSIZE 1024 48 49 #define __WRITE_ASS(str, fmt, data) \ 50 do { \ 51 char buf[BUFSIZE]; \ 52 size_t size; \ 53 \ 54 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \ 55 if (1 != fwrite(buf, size, 1, file)) { \ 56 perror("test attr - failed to write event file"); \ 57 fclose(file); \ 58 return -1; \ 59 } \ 60 \ 61 } while (0) 62 63 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 64 65 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, 66 int fd, int group_fd, unsigned long flags) 67 { 68 FILE *file; 69 char path[PATH_MAX]; 70 71 if (!ready) 72 return 0; 73 74 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 75 attr->type, attr->config, fd); 76 77 file = fopen(path, "w+"); 78 if (!file) { 79 perror("test attr - failed to open event file"); 80 return -1; 81 } 82 83 if (fprintf(file, "[event-%d-%llu-%d]\n", 84 attr->type, attr->config, fd) < 0) { 85 perror("test attr - failed to write event file"); 86 fclose(file); 87 return -1; 88 } 89 90 /* syscall arguments */ 91 __WRITE_ASS(fd, "d", fd); 92 __WRITE_ASS(group_fd, "d", group_fd); 93 __WRITE_ASS(cpu, "d", cpu); 94 __WRITE_ASS(pid, "d", pid); 95 __WRITE_ASS(flags, "lu", flags); 96 97 /* struct perf_event_attr */ 98 WRITE_ASS(type, PRIu32); 99 WRITE_ASS(size, PRIu32); 100 WRITE_ASS(config, "llu"); 101 WRITE_ASS(sample_period, "llu"); 102 WRITE_ASS(sample_type, "llu"); 103 WRITE_ASS(read_format, "llu"); 104 WRITE_ASS(disabled, "d"); 105 WRITE_ASS(inherit, "d"); 106 WRITE_ASS(pinned, "d"); 107 WRITE_ASS(exclusive, "d"); 108 WRITE_ASS(exclude_user, "d"); 109 WRITE_ASS(exclude_kernel, "d"); 110 WRITE_ASS(exclude_hv, "d"); 111 WRITE_ASS(exclude_idle, "d"); 112 WRITE_ASS(mmap, "d"); 113 WRITE_ASS(comm, "d"); 114 WRITE_ASS(freq, "d"); 115 WRITE_ASS(inherit_stat, "d"); 116 WRITE_ASS(enable_on_exec, "d"); 117 WRITE_ASS(task, "d"); 118 WRITE_ASS(watermark, "d"); 119 WRITE_ASS(precise_ip, "d"); 120 WRITE_ASS(mmap_data, "d"); 121 WRITE_ASS(sample_id_all, "d"); 122 WRITE_ASS(exclude_host, "d"); 123 WRITE_ASS(exclude_guest, "d"); 124 WRITE_ASS(exclude_callchain_kernel, "d"); 125 WRITE_ASS(exclude_callchain_user, "d"); 126 WRITE_ASS(wakeup_events, PRIu32); 127 WRITE_ASS(bp_type, PRIu32); 128 WRITE_ASS(config1, "llu"); 129 WRITE_ASS(config2, "llu"); 130 WRITE_ASS(branch_sample_type, "llu"); 131 WRITE_ASS(sample_regs_user, "llu"); 132 WRITE_ASS(sample_stack_user, PRIu32); 133 134 fclose(file); 135 return 0; 136 } 137 138 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, 139 int fd, int group_fd, unsigned long flags) 140 { 141 int errno_saved = errno; 142 143 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) { 144 pr_err("test attr FAILED"); 145 exit(128); 146 } 147 148 errno = errno_saved; 149 } 150 151 void test_attr__ready(void) 152 { 153 if (unlikely(test_attr__enabled) && !ready) 154 ready = true; 155 } 156 157 static int run_dir(const char *d, const char *perf) 158 { 159 char v[] = "-vvvvv"; 160 int vcnt = min(verbose, (int) sizeof(v) - 1); 161 char cmd[3*PATH_MAX]; 162 163 if (verbose > 0) 164 vcnt++; 165 166 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s", 167 d, d, perf, vcnt, v); 168 169 return system(cmd); 170 } 171 172 int test__attr(struct test *test __maybe_unused, int subtest __maybe_unused) 173 { 174 struct stat st; 175 char path_perf[PATH_MAX]; 176 char path_dir[PATH_MAX]; 177 178 /* First try developement tree tests. */ 179 if (!lstat("./tests", &st)) 180 return run_dir("./tests", "./perf"); 181 182 /* Then installed path. */ 183 snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path()); 184 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); 185 186 if (!lstat(path_dir, &st) && 187 !lstat(path_perf, &st)) 188 return run_dir(path_dir, path_perf); 189 190 return TEST_SKIP; 191 } 192