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 <stdlib.h> 22 #include <stdio.h> 23 #include <linux/types.h> 24 #include <linux/kernel.h> 25 #include "../perf.h" 26 #include "util.h" 27 #include <subcmd/exec-cmd.h> 28 #include "tests.h" 29 30 #define ENV "PERF_TEST_ATTR" 31 32 extern int verbose; 33 34 static char *dir; 35 36 void test_attr__init(void) 37 { 38 dir = getenv(ENV); 39 test_attr__enabled = (dir != NULL); 40 } 41 42 #define BUFSIZE 1024 43 44 #define __WRITE_ASS(str, fmt, data) \ 45 do { \ 46 char buf[BUFSIZE]; \ 47 size_t size; \ 48 \ 49 size = snprintf(buf, BUFSIZE, #str "=%"fmt "\n", data); \ 50 if (1 != fwrite(buf, size, 1, file)) { \ 51 perror("test attr - failed to write event file"); \ 52 fclose(file); \ 53 return -1; \ 54 } \ 55 \ 56 } while (0) 57 58 #define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field) 59 60 static int store_event(struct perf_event_attr *attr, pid_t pid, int cpu, 61 int fd, int group_fd, unsigned long flags) 62 { 63 FILE *file; 64 char path[PATH_MAX]; 65 66 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 67 attr->type, attr->config, fd); 68 69 file = fopen(path, "w+"); 70 if (!file) { 71 perror("test attr - failed to open event file"); 72 return -1; 73 } 74 75 if (fprintf(file, "[event-%d-%llu-%d]\n", 76 attr->type, attr->config, fd) < 0) { 77 perror("test attr - failed to write event file"); 78 fclose(file); 79 return -1; 80 } 81 82 /* syscall arguments */ 83 __WRITE_ASS(fd, "d", fd); 84 __WRITE_ASS(group_fd, "d", group_fd); 85 __WRITE_ASS(cpu, "d", cpu); 86 __WRITE_ASS(pid, "d", pid); 87 __WRITE_ASS(flags, "lu", flags); 88 89 /* struct perf_event_attr */ 90 WRITE_ASS(type, PRIu32); 91 WRITE_ASS(size, PRIu32); 92 WRITE_ASS(config, "llu"); 93 WRITE_ASS(sample_period, "llu"); 94 WRITE_ASS(sample_type, "llu"); 95 WRITE_ASS(read_format, "llu"); 96 WRITE_ASS(disabled, "d"); 97 WRITE_ASS(inherit, "d"); 98 WRITE_ASS(pinned, "d"); 99 WRITE_ASS(exclusive, "d"); 100 WRITE_ASS(exclude_user, "d"); 101 WRITE_ASS(exclude_kernel, "d"); 102 WRITE_ASS(exclude_hv, "d"); 103 WRITE_ASS(exclude_idle, "d"); 104 WRITE_ASS(mmap, "d"); 105 WRITE_ASS(comm, "d"); 106 WRITE_ASS(freq, "d"); 107 WRITE_ASS(inherit_stat, "d"); 108 WRITE_ASS(enable_on_exec, "d"); 109 WRITE_ASS(task, "d"); 110 WRITE_ASS(watermark, "d"); 111 WRITE_ASS(precise_ip, "d"); 112 WRITE_ASS(mmap_data, "d"); 113 WRITE_ASS(sample_id_all, "d"); 114 WRITE_ASS(exclude_host, "d"); 115 WRITE_ASS(exclude_guest, "d"); 116 WRITE_ASS(exclude_callchain_kernel, "d"); 117 WRITE_ASS(exclude_callchain_user, "d"); 118 WRITE_ASS(wakeup_events, PRIu32); 119 WRITE_ASS(bp_type, PRIu32); 120 WRITE_ASS(config1, "llu"); 121 WRITE_ASS(config2, "llu"); 122 WRITE_ASS(branch_sample_type, "llu"); 123 WRITE_ASS(sample_regs_user, "llu"); 124 WRITE_ASS(sample_stack_user, PRIu32); 125 126 fclose(file); 127 return 0; 128 } 129 130 void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, 131 int fd, int group_fd, unsigned long flags) 132 { 133 int errno_saved = errno; 134 135 if (store_event(attr, pid, cpu, fd, group_fd, flags)) 136 die("test attr FAILED"); 137 138 errno = errno_saved; 139 } 140 141 static int run_dir(const char *d, const char *perf) 142 { 143 char v[] = "-vvvvv"; 144 int vcnt = min(verbose, (int) sizeof(v) - 1); 145 char cmd[3*PATH_MAX]; 146 147 if (verbose > 0) 148 vcnt++; 149 150 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s", 151 d, d, perf, vcnt, v); 152 153 return system(cmd); 154 } 155 156 int test__attr(int subtest __maybe_unused) 157 { 158 struct stat st; 159 char path_perf[PATH_MAX]; 160 char path_dir[PATH_MAX]; 161 162 /* First try developement tree tests. */ 163 if (!lstat("./tests", &st)) 164 return run_dir("./tests", "./perf"); 165 166 /* Then installed path. */ 167 snprintf(path_dir, PATH_MAX, "%s/tests", get_argv_exec_path()); 168 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); 169 170 if (!lstat(path_dir, &st) && 171 !lstat(path_perf, &st)) 172 return run_dir(path_dir, path_perf); 173 174 return TEST_SKIP; 175 } 176