1 // SPDX-License-Identifier: GPL-2.0 2 #include "util.h" 3 #include "debug.h" 4 #include "event.h" 5 #include <api/fs/fs.h> 6 #include <sys/stat.h> 7 #include <sys/utsname.h> 8 #include <dirent.h> 9 #include <fcntl.h> 10 #include <inttypes.h> 11 #include <signal.h> 12 #include <stdio.h> 13 #include <stdlib.h> 14 #include <string.h> 15 #include <errno.h> 16 #include <limits.h> 17 #include <linux/capability.h> 18 #include <linux/kernel.h> 19 #include <linux/log2.h> 20 #include <linux/time64.h> 21 #include <unistd.h> 22 #include "cap.h" 23 #include "strlist.h" 24 #include "string2.h" 25 26 /* 27 * XXX We need to find a better place for these things... 28 */ 29 30 bool perf_singlethreaded = true; 31 32 void perf_set_singlethreaded(void) 33 { 34 perf_singlethreaded = true; 35 } 36 37 void perf_set_multithreaded(void) 38 { 39 perf_singlethreaded = false; 40 } 41 42 int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; 43 int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK; 44 45 int sysctl__max_stack(void) 46 { 47 int value; 48 49 if (sysctl__read_int("kernel/perf_event_max_stack", &value) == 0) 50 sysctl_perf_event_max_stack = value; 51 52 if (sysctl__read_int("kernel/perf_event_max_contexts_per_stack", &value) == 0) 53 sysctl_perf_event_max_contexts_per_stack = value; 54 55 return sysctl_perf_event_max_stack; 56 } 57 58 bool test_attr__enabled; 59 60 bool perf_host = true; 61 bool perf_guest = false; 62 63 void event_attr_init(struct perf_event_attr *attr) 64 { 65 if (!perf_host) 66 attr->exclude_host = 1; 67 if (!perf_guest) 68 attr->exclude_guest = 1; 69 /* to capture ABI version */ 70 attr->size = sizeof(*attr); 71 } 72 73 int mkdir_p(char *path, mode_t mode) 74 { 75 struct stat st; 76 int err; 77 char *d = path; 78 79 if (*d != '/') 80 return -1; 81 82 if (stat(path, &st) == 0) 83 return 0; 84 85 while (*++d == '/'); 86 87 while ((d = strchr(d, '/'))) { 88 *d = '\0'; 89 err = stat(path, &st) && mkdir(path, mode); 90 *d++ = '/'; 91 if (err) 92 return -1; 93 while (*d == '/') 94 ++d; 95 } 96 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; 97 } 98 99 static bool match_pat(char *file, const char **pat) 100 { 101 int i = 0; 102 103 if (!pat) 104 return true; 105 106 while (pat[i]) { 107 if (strglobmatch(file, pat[i])) 108 return true; 109 110 i++; 111 } 112 113 return false; 114 } 115 116 /* 117 * The depth specify how deep the removal will go. 118 * 0 - will remove only files under the 'path' directory 119 * 1 .. x - will dive in x-level deep under the 'path' directory 120 * 121 * If specified the pat is array of string patterns ended with NULL, 122 * which are checked upon every file/directory found. Only matching 123 * ones are removed. 124 * 125 * The function returns: 126 * 0 on success 127 * -1 on removal failure with errno set 128 * -2 on pattern failure 129 */ 130 static int rm_rf_depth_pat(const char *path, int depth, const char **pat) 131 { 132 DIR *dir; 133 int ret; 134 struct dirent *d; 135 char namebuf[PATH_MAX]; 136 struct stat statbuf; 137 138 /* Do not fail if there's no file. */ 139 ret = lstat(path, &statbuf); 140 if (ret) 141 return 0; 142 143 /* Try to remove any file we get. */ 144 if (!(statbuf.st_mode & S_IFDIR)) 145 return unlink(path); 146 147 /* We have directory in path. */ 148 dir = opendir(path); 149 if (dir == NULL) 150 return -1; 151 152 while ((d = readdir(dir)) != NULL && !ret) { 153 154 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) 155 continue; 156 157 if (!match_pat(d->d_name, pat)) 158 return -2; 159 160 scnprintf(namebuf, sizeof(namebuf), "%s/%s", 161 path, d->d_name); 162 163 /* We have to check symbolic link itself */ 164 ret = lstat(namebuf, &statbuf); 165 if (ret < 0) { 166 pr_debug("stat failed: %s\n", namebuf); 167 break; 168 } 169 170 if (S_ISDIR(statbuf.st_mode)) 171 ret = depth ? rm_rf_depth_pat(namebuf, depth - 1, pat) : 0; 172 else 173 ret = unlink(namebuf); 174 } 175 closedir(dir); 176 177 if (ret < 0) 178 return ret; 179 180 return rmdir(path); 181 } 182 183 int rm_rf_perf_data(const char *path) 184 { 185 const char *pat[] = { 186 "header", 187 "data.*", 188 NULL, 189 }; 190 191 return rm_rf_depth_pat(path, 0, pat); 192 } 193 194 int rm_rf(const char *path) 195 { 196 return rm_rf_depth_pat(path, INT_MAX, NULL); 197 } 198 199 /* A filter which removes dot files */ 200 bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d) 201 { 202 return d->d_name[0] != '.'; 203 } 204 205 /* lsdir reads a directory and store it in strlist */ 206 struct strlist *lsdir(const char *name, 207 bool (*filter)(const char *, struct dirent *)) 208 { 209 struct strlist *list = NULL; 210 DIR *dir; 211 struct dirent *d; 212 213 dir = opendir(name); 214 if (!dir) 215 return NULL; 216 217 list = strlist__new(NULL, NULL); 218 if (!list) { 219 errno = ENOMEM; 220 goto out; 221 } 222 223 while ((d = readdir(dir)) != NULL) { 224 if (!filter || filter(name, d)) 225 strlist__add(list, d->d_name); 226 } 227 228 out: 229 closedir(dir); 230 return list; 231 } 232 233 size_t hex_width(u64 v) 234 { 235 size_t n = 1; 236 237 while ((v >>= 4)) 238 ++n; 239 240 return n; 241 } 242 243 int perf_event_paranoid(void) 244 { 245 int value; 246 247 if (sysctl__read_int("kernel/perf_event_paranoid", &value)) 248 return INT_MAX; 249 250 return value; 251 } 252 253 bool perf_event_paranoid_check(int max_level) 254 { 255 return perf_cap__capable(CAP_SYS_ADMIN) || 256 perf_event_paranoid() <= max_level; 257 } 258 259 static int 260 fetch_ubuntu_kernel_version(unsigned int *puint) 261 { 262 ssize_t len; 263 size_t line_len = 0; 264 char *ptr, *line = NULL; 265 int version, patchlevel, sublevel, err; 266 FILE *vsig; 267 268 if (!puint) 269 return 0; 270 271 vsig = fopen("/proc/version_signature", "r"); 272 if (!vsig) { 273 pr_debug("Open /proc/version_signature failed: %s\n", 274 strerror(errno)); 275 return -1; 276 } 277 278 len = getline(&line, &line_len, vsig); 279 fclose(vsig); 280 err = -1; 281 if (len <= 0) { 282 pr_debug("Reading from /proc/version_signature failed: %s\n", 283 strerror(errno)); 284 goto errout; 285 } 286 287 ptr = strrchr(line, ' '); 288 if (!ptr) { 289 pr_debug("Parsing /proc/version_signature failed: %s\n", line); 290 goto errout; 291 } 292 293 err = sscanf(ptr + 1, "%d.%d.%d", 294 &version, &patchlevel, &sublevel); 295 if (err != 3) { 296 pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n", 297 line); 298 goto errout; 299 } 300 301 *puint = (version << 16) + (patchlevel << 8) + sublevel; 302 err = 0; 303 errout: 304 free(line); 305 return err; 306 } 307 308 int 309 fetch_kernel_version(unsigned int *puint, char *str, 310 size_t str_size) 311 { 312 struct utsname utsname; 313 int version, patchlevel, sublevel, err; 314 bool int_ver_ready = false; 315 316 if (access("/proc/version_signature", R_OK) == 0) 317 if (!fetch_ubuntu_kernel_version(puint)) 318 int_ver_ready = true; 319 320 if (uname(&utsname)) 321 return -1; 322 323 if (str && str_size) { 324 strncpy(str, utsname.release, str_size); 325 str[str_size - 1] = '\0'; 326 } 327 328 if (!puint || int_ver_ready) 329 return 0; 330 331 err = sscanf(utsname.release, "%d.%d.%d", 332 &version, &patchlevel, &sublevel); 333 334 if (err != 3) { 335 pr_debug("Unable to get kernel version from uname '%s'\n", 336 utsname.release); 337 return -1; 338 } 339 340 *puint = (version << 16) + (patchlevel << 8) + sublevel; 341 return 0; 342 } 343 344 const char *perf_tip(const char *dirpath) 345 { 346 struct strlist *tips; 347 struct str_node *node; 348 char *tip = NULL; 349 struct strlist_config conf = { 350 .dirname = dirpath, 351 .file_only = true, 352 }; 353 354 tips = strlist__new("tips.txt", &conf); 355 if (tips == NULL) 356 return errno == ENOENT ? NULL : 357 "Tip: check path of tips.txt or get more memory! ;-p"; 358 359 if (strlist__nr_entries(tips) == 0) 360 goto out; 361 362 node = strlist__entry(tips, random() % strlist__nr_entries(tips)); 363 if (asprintf(&tip, "Tip: %s", node->s) < 0) 364 tip = (char *)"Tip: get more memory! ;-)"; 365 366 out: 367 strlist__delete(tips); 368 369 return tip; 370 } 371 372 char *perf_exe(char *buf, int len) 373 { 374 int n = readlink("/proc/self/exe", buf, len); 375 if (n > 0) { 376 buf[n] = 0; 377 return buf; 378 } 379 return strcpy(buf, "perf"); 380 } 381