1 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/* 23 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select 24 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu. 25 */ 26#define __SANE_USERSPACE_TYPES__ 27#include <stdlib.h> 28#include <stdio.h> 29#include <inttypes.h> 30#include <linux/types.h> 31#include <linux/kernel.h> 32#include "../perf.h" 33#include "util.h" 34#include "exec_cmd.h" 35#include "tests.h" 36 37#define ENV "PERF_TEST_ATTR" 38 39extern int verbose; 40 41static char *dir; 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 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir, 74 attr->type, attr->config, fd); 75 76 file = fopen(path, "w+"); 77 if (!file) { 78 perror("test attr - failed to open event file"); 79 return -1; 80 } 81 82 if (fprintf(file, "[event-%d-%llu-%d]\n", 83 attr->type, attr->config, fd) < 0) { 84 perror("test attr - failed to write event file"); 85 fclose(file); 86 return -1; 87 } 88 89 /* syscall arguments */ 90 __WRITE_ASS(fd, "d", fd); 91 __WRITE_ASS(group_fd, "d", group_fd); 92 __WRITE_ASS(cpu, "d", cpu); 93 __WRITE_ASS(pid, "d", pid); 94 __WRITE_ASS(flags, "lu", flags); 95 96 /* struct perf_event_attr */ 97 WRITE_ASS(type, PRIu32); 98 WRITE_ASS(size, PRIu32); 99 WRITE_ASS(config, "llu"); 100 WRITE_ASS(sample_period, "llu"); 101 WRITE_ASS(sample_type, "llu"); 102 WRITE_ASS(read_format, "llu"); 103 WRITE_ASS(disabled, "d"); 104 WRITE_ASS(inherit, "d"); 105 WRITE_ASS(pinned, "d"); 106 WRITE_ASS(exclusive, "d"); 107 WRITE_ASS(exclude_user, "d"); 108 WRITE_ASS(exclude_kernel, "d"); 109 WRITE_ASS(exclude_hv, "d"); 110 WRITE_ASS(exclude_idle, "d"); 111 WRITE_ASS(mmap, "d"); 112 WRITE_ASS(comm, "d"); 113 WRITE_ASS(freq, "d"); 114 WRITE_ASS(inherit_stat, "d"); 115 WRITE_ASS(enable_on_exec, "d"); 116 WRITE_ASS(task, "d"); 117 WRITE_ASS(watermark, "d"); 118 WRITE_ASS(precise_ip, "d"); 119 WRITE_ASS(mmap_data, "d"); 120 WRITE_ASS(sample_id_all, "d"); 121 WRITE_ASS(exclude_host, "d"); 122 WRITE_ASS(exclude_guest, "d"); 123 WRITE_ASS(exclude_callchain_kernel, "d"); 124 WRITE_ASS(exclude_callchain_user, "d"); 125 WRITE_ASS(wakeup_events, PRIu32); 126 WRITE_ASS(bp_type, PRIu32); 127 WRITE_ASS(config1, "llu"); 128 WRITE_ASS(config2, "llu"); 129 WRITE_ASS(branch_sample_type, "llu"); 130 WRITE_ASS(sample_regs_user, "llu"); 131 WRITE_ASS(sample_stack_user, PRIu32); 132 133 fclose(file); 134 return 0; 135} 136 137void test_attr__open(struct perf_event_attr *attr, pid_t pid, int cpu, 138 int fd, int group_fd, unsigned long flags) 139{ 140 int errno_saved = errno; 141 142 if (store_event(attr, pid, cpu, fd, group_fd, flags)) 143 die("test attr FAILED"); 144 145 errno = errno_saved; 146} 147 148static int run_dir(const char *d, const char *perf) 149{ 150 char v[] = "-vvvvv"; 151 int vcnt = min(verbose, (int) sizeof(v) - 1); 152 char cmd[3*PATH_MAX]; 153 154 if (verbose) 155 vcnt++; 156 157 snprintf(cmd, 3*PATH_MAX, PYTHON " %s/attr.py -d %s/attr/ -p %s %.*s", 158 d, d, perf, vcnt, v); 159 160 return system(cmd); 161} 162 163int test__attr(void) 164{ 165 struct stat st; 166 char path_perf[PATH_MAX]; 167 char path_dir[PATH_MAX]; 168 169 /* First try developement tree tests. */ 170 if (!lstat("./tests", &st)) 171 return run_dir("./tests", "./perf"); 172 173 /* Then installed path. */ 174 snprintf(path_dir, PATH_MAX, "%s/tests", perf_exec_path()); 175 snprintf(path_perf, PATH_MAX, "%s/perf", BINDIR); 176 177 if (!lstat(path_dir, &st) && 178 !lstat(path_perf, &st)) 179 return run_dir(path_dir, path_perf); 180 181 fprintf(stderr, " (omitted)"); 182 return 0; 183} 184