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 40 void test_attr__init(void) 41 { 42 dir = getenv(ENV); 43 test_attr__enabled = (dir != NULL); 44 } 45 46 #define BUFSIZE 1024 47 48 #define __WRITE_ASS(str, fmt, data) \ 49 do { \ 50 char buf[BUFSIZE]; \ 51 size_t size; \ 52 \ 53 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \ 54 if (1 != fwrite(buf, size, 1, file)) { \ 55 perror("test attr - failed to write event file"); \ 56 fclose(file); \ 57 return -1; \ 58 } \ 59 \ 60 } while (0) 61 62 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 63 64 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, 65 int fd, int group_fd, unsigned long flags) 66 { 67 FILE *file; 68 char path[PATH_MAX]; 69 70 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 71 attr->type, attr->config, fd); 72 73 file = fopen(path, "w+"); 74 if (!file) { 75 perror("test attr - failed to open event file"); 76 return -1; 77 } 78 79 if (fprintf(file, "[event-%d-%llu-%d]\n", 80 attr->type, attr->config, fd) < 0) { 81 perror("test attr - failed to write event file"); 82 fclose(file); 83 return -1; 84 } 85 86 /* syscall arguments */ 87 __WRITE_ASS(fd, "d", fd); 88 __WRITE_ASS(group_fd, "d", group_fd); 89 __WRITE_ASS(cpu, "d", cpu); 90 __WRITE_ASS(pid, "d", pid); 91 __WRITE_ASS(flags, "lu", flags); 92 93 /* struct perf_event_attr */ 94 WRITE_ASS(type, PRIu32); 95 WRITE_ASS(size, PRIu32); 96 WRITE_ASS(config, "llu"); 97 WRITE_ASS(sample_period, "llu"); 98 WRITE_ASS(sample_type, "llu"); 99 WRITE_ASS(read_format, "llu"); 100 WRITE_ASS(disabled, "d"); 101 WRITE_ASS(inherit, "d"); 102 WRITE_ASS(pinned, "d"); 103 WRITE_ASS(exclusive, "d"); 104 WRITE_ASS(exclude_user, "d"); 105 WRITE_ASS(exclude_kernel, "d"); 106 WRITE_ASS(exclude_hv, "d"); 107 WRITE_ASS(exclude_idle, "d"); 108 WRITE_ASS(mmap, "d"); 109 WRITE_ASS(comm, "d"); 110 WRITE_ASS(freq, "d"); 111 WRITE_ASS(inherit_stat, "d"); 112 WRITE_ASS(enable_on_exec, "d"); 113 WRITE_ASS(task, "d"); 114 WRITE_ASS(watermark, "d"); 115 WRITE_ASS(precise_ip, "d"); 116 WRITE_ASS(mmap_data, "d"); 117 WRITE_ASS(sample_id_all, "d"); 118 WRITE_ASS(exclude_host, "d"); 119 WRITE_ASS(exclude_guest, "d"); 120 WRITE_ASS(exclude_callchain_kernel, "d"); 121 WRITE_ASS(exclude_callchain_user, "d"); 122 WRITE_ASS(wakeup_events, PRIu32); 123 WRITE_ASS(bp_type, PRIu32); 124 WRITE_ASS(config1, "llu"); 125 WRITE_ASS(config2, "llu"); 126 WRITE_ASS(branch_sample_type, "llu"); 127 WRITE_ASS(sample_regs_user, "llu"); 128 WRITE_ASS(sample_stack_user, PRIu32); 129 130 fclose(file); 131 return 0; 132 } 133 134 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, 135 int fd, int group_fd, unsigned long flags) 136 { 137 int errno_saved = errno; 138 139 if (store_event(attr, pid, cpu, fd, group_fd, flags)) { 140 pr_err("test attr FAILED"); 141 exit(128); 142 } 143 144 errno = errno_saved; 145 } 146 147 static int run_dir(const char *d, const char *perf) 148 { 149 char v[] = "-vvvvv"; 150 int vcnt = min(verbose, (int) sizeof(v) - 1); 151 char cmd[3*PATH_MAX]; 152 153 if (verbose > 0) 154 vcnt++; 155 156 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s", 157 d, d, perf, vcnt, v); 158 159 return system(cmd); 160 } 161 162 int test__attr(int subtest __maybe_unused) 163 { 164 struct stat st; 165 char path_perf[PATH_MAX]; 166 char path_dir[PATH_MAX]; 167 168 /* First try developement tree tests. */ 169 if (!lstat("./tests", &st)) 170 return run_dir("./tests", "./perf"); 171 172 /* Then installed path. */ 173 snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path()); 174 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); 175 176 if (!lstat(path_dir, &st) && 177 !lstat(path_perf, &st)) 178 return run_dir(path_dir, path_perf); 179 180 return TEST_SKIP; 181 } 182