1 #include "../perf.h" 2 #include "util.h" 3 #include "debug.h" 4 #include <api/fs/fs.h> 5 #include <sys/mman.h> 6 #include <sys/utsname.h> 7 #ifdef HAVE_BACKTRACE_SUPPORT 8 #include <execinfo.h> 9 #endif 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include <string.h> 13 #include <errno.h> 14 #include <limits.h> 15 #include <byteswap.h> 16 #include <linux/kernel.h> 17 #include <linux/log2.h> 18 #include <unistd.h> 19 #include "callchain.h" 20 #include "strlist.h" 21 22 struct callchain_param callchain_param = { 23 .mode = CHAIN_GRAPH_ABS, 24 .min_percent = 0.5, 25 .order = ORDER_CALLEE, 26 .key = CCKEY_FUNCTION, 27 .value = CCVAL_PERCENT, 28 }; 29 30 /* 31 * XXX We need to find a better place for these things... 32 */ 33 unsigned int page_size; 34 int cacheline_size; 35 36 unsigned int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH; 37 38 bool test_attr__enabled; 39 40 bool perf_host = true; 41 bool perf_guest = false; 42 43 void event_attr_init(struct perf_event_attr *attr) 44 { 45 if (!perf_host) 46 attr->exclude_host = 1; 47 if (!perf_guest) 48 attr->exclude_guest = 1; 49 /* to capture ABI version */ 50 attr->size = sizeof(*attr); 51 } 52 53 int mkdir_p(char *path, mode_t mode) 54 { 55 struct stat st; 56 int err; 57 char *d = path; 58 59 if (*d != '/') 60 return -1; 61 62 if (stat(path, &st) == 0) 63 return 0; 64 65 while (*++d == '/'); 66 67 while ((d = strchr(d, '/'))) { 68 *d = '\0'; 69 err = stat(path, &st) && mkdir(path, mode); 70 *d++ = '/'; 71 if (err) 72 return -1; 73 while (*d == '/') 74 ++d; 75 } 76 return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0; 77 } 78 79 int rm_rf(char *path) 80 { 81 DIR *dir; 82 int ret = 0; 83 struct dirent *d; 84 char namebuf[PATH_MAX]; 85 86 dir = opendir(path); 87 if (dir == NULL) 88 return 0; 89 90 while ((d = readdir(dir)) != NULL && !ret) { 91 struct stat statbuf; 92 93 if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, "..")) 94 continue; 95 96 scnprintf(namebuf, sizeof(namebuf), "%s/%s", 97 path, d->d_name); 98 99 ret = stat(namebuf, &statbuf); 100 if (ret < 0) { 101 pr_debug("stat failed: %s\n", namebuf); 102 break; 103 } 104 105 if (S_ISREG(statbuf.st_mode)) 106 ret = unlink(namebuf); 107 else if (S_ISDIR(statbuf.st_mode)) 108 ret = rm_rf(namebuf); 109 else { 110 pr_debug("unknown file: %s\n", namebuf); 111 ret = -1; 112 } 113 } 114 closedir(dir); 115 116 if (ret < 0) 117 return ret; 118 119 return rmdir(path); 120 } 121 122 /* A filter which removes dot files */ 123 bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d) 124 { 125 return d->d_name[0] != '.'; 126 } 127 128 /* lsdir reads a directory and store it in strlist */ 129 struct strlist *lsdir(const char *name, 130 bool (*filter)(const char *, struct dirent *)) 131 { 132 struct strlist *list = NULL; 133 DIR *dir; 134 struct dirent *d; 135 136 dir = opendir(name); 137 if (!dir) 138 return NULL; 139 140 list = strlist__new(NULL, NULL); 141 if (!list) { 142 errno = ENOMEM; 143 goto out; 144 } 145 146 while ((d = readdir(dir)) != NULL) { 147 if (!filter || filter(name, d)) 148 strlist__add(list, d->d_name); 149 } 150 151 out: 152 closedir(dir); 153 return list; 154 } 155 156 static int slow_copyfile(const char *from, const char *to) 157 { 158 int err = -1; 159 char *line = NULL; 160 size_t n; 161 FILE *from_fp = fopen(from, "r"), *to_fp; 162 163 if (from_fp == NULL) 164 goto out; 165 166 to_fp = fopen(to, "w"); 167 if (to_fp == NULL) 168 goto out_fclose_from; 169 170 while (getline(&line, &n, from_fp) > 0) 171 if (fputs(line, to_fp) == EOF) 172 goto out_fclose_to; 173 err = 0; 174 out_fclose_to: 175 fclose(to_fp); 176 free(line); 177 out_fclose_from: 178 fclose(from_fp); 179 out: 180 return err; 181 } 182 183 int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size) 184 { 185 void *ptr; 186 loff_t pgoff; 187 188 pgoff = off_in & ~(page_size - 1); 189 off_in -= pgoff; 190 191 ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff); 192 if (ptr == MAP_FAILED) 193 return -1; 194 195 while (size) { 196 ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out); 197 if (ret < 0 && errno == EINTR) 198 continue; 199 if (ret <= 0) 200 break; 201 202 size -= ret; 203 off_in += ret; 204 off_out -= ret; 205 } 206 munmap(ptr, off_in + size); 207 208 return size ? -1 : 0; 209 } 210 211 int copyfile_mode(const char *from, const char *to, mode_t mode) 212 { 213 int fromfd, tofd; 214 struct stat st; 215 int err = -1; 216 char *tmp = NULL, *ptr = NULL; 217 218 if (stat(from, &st)) 219 goto out; 220 221 /* extra 'x' at the end is to reserve space for '.' */ 222 if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) { 223 tmp = NULL; 224 goto out; 225 } 226 ptr = strrchr(tmp, '/'); 227 if (!ptr) 228 goto out; 229 ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1); 230 *ptr = '.'; 231 232 tofd = mkstemp(tmp); 233 if (tofd < 0) 234 goto out; 235 236 if (fchmod(tofd, mode)) 237 goto out_close_to; 238 239 if (st.st_size == 0) { /* /proc? do it slowly... */ 240 err = slow_copyfile(from, tmp); 241 goto out_close_to; 242 } 243 244 fromfd = open(from, O_RDONLY); 245 if (fromfd < 0) 246 goto out_close_to; 247 248 err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size); 249 250 close(fromfd); 251 out_close_to: 252 close(tofd); 253 if (!err) 254 err = link(tmp, to); 255 unlink(tmp); 256 out: 257 free(tmp); 258 return err; 259 } 260 261 int copyfile(const char *from, const char *to) 262 { 263 return copyfile_mode(from, to, 0755); 264 } 265 266 unsigned long convert_unit(unsigned long value, char *unit) 267 { 268 *unit = ' '; 269 270 if (value > 1000) { 271 value /= 1000; 272 *unit = 'K'; 273 } 274 275 if (value > 1000) { 276 value /= 1000; 277 *unit = 'M'; 278 } 279 280 if (value > 1000) { 281 value /= 1000; 282 *unit = 'G'; 283 } 284 285 return value; 286 } 287 288 static ssize_t ion(bool is_read, int fd, void *buf, size_t n) 289 { 290 void *buf_start = buf; 291 size_t left = n; 292 293 while (left) { 294 ssize_t ret = is_read ? read(fd, buf, left) : 295 write(fd, buf, left); 296 297 if (ret < 0 && errno == EINTR) 298 continue; 299 if (ret <= 0) 300 return ret; 301 302 left -= ret; 303 buf += ret; 304 } 305 306 BUG_ON((size_t)(buf - buf_start) != n); 307 return n; 308 } 309 310 /* 311 * Read exactly 'n' bytes or return an error. 312 */ 313 ssize_t readn(int fd, void *buf, size_t n) 314 { 315 return ion(true, fd, buf, n); 316 } 317 318 /* 319 * Write exactly 'n' bytes or return an error. 320 */ 321 ssize_t writen(int fd, void *buf, size_t n) 322 { 323 return ion(false, fd, buf, n); 324 } 325 326 size_t hex_width(u64 v) 327 { 328 size_t n = 1; 329 330 while ((v >>= 4)) 331 ++n; 332 333 return n; 334 } 335 336 static int hex(char ch) 337 { 338 if ((ch >= '0') && (ch <= '9')) 339 return ch - '0'; 340 if ((ch >= 'a') && (ch <= 'f')) 341 return ch - 'a' + 10; 342 if ((ch >= 'A') && (ch <= 'F')) 343 return ch - 'A' + 10; 344 return -1; 345 } 346 347 /* 348 * While we find nice hex chars, build a long_val. 349 * Return number of chars processed. 350 */ 351 int hex2u64(const char *ptr, u64 *long_val) 352 { 353 const char *p = ptr; 354 *long_val = 0; 355 356 while (*p) { 357 const int hex_val = hex(*p); 358 359 if (hex_val < 0) 360 break; 361 362 *long_val = (*long_val << 4) | hex_val; 363 p++; 364 } 365 366 return p - ptr; 367 } 368 369 /* Obtain a backtrace and print it to stdout. */ 370 #ifdef HAVE_BACKTRACE_SUPPORT 371 void dump_stack(void) 372 { 373 void *array[16]; 374 size_t size = backtrace(array, ARRAY_SIZE(array)); 375 char **strings = backtrace_symbols(array, size); 376 size_t i; 377 378 printf("Obtained %zd stack frames.\n", size); 379 380 for (i = 0; i < size; i++) 381 printf("%s\n", strings[i]); 382 383 free(strings); 384 } 385 #else 386 void dump_stack(void) {} 387 #endif 388 389 void sighandler_dump_stack(int sig) 390 { 391 psignal(sig, "perf"); 392 dump_stack(); 393 signal(sig, SIG_DFL); 394 raise(sig); 395 } 396 397 int parse_nsec_time(const char *str, u64 *ptime) 398 { 399 u64 time_sec, time_nsec; 400 char *end; 401 402 time_sec = strtoul(str, &end, 10); 403 if (*end != '.' && *end != '\0') 404 return -1; 405 406 if (*end == '.') { 407 int i; 408 char nsec_buf[10]; 409 410 if (strlen(++end) > 9) 411 return -1; 412 413 strncpy(nsec_buf, end, 9); 414 nsec_buf[9] = '\0'; 415 416 /* make it nsec precision */ 417 for (i = strlen(nsec_buf); i < 9; i++) 418 nsec_buf[i] = '0'; 419 420 time_nsec = strtoul(nsec_buf, &end, 10); 421 if (*end != '\0') 422 return -1; 423 } else 424 time_nsec = 0; 425 426 *ptime = time_sec * NSEC_PER_SEC + time_nsec; 427 return 0; 428 } 429 430 unsigned long parse_tag_value(const char *str, struct parse_tag *tags) 431 { 432 struct parse_tag *i = tags; 433 434 while (i->tag) { 435 char *s; 436 437 s = strchr(str, i->tag); 438 if (s) { 439 unsigned long int value; 440 char *endptr; 441 442 value = strtoul(str, &endptr, 10); 443 if (s != endptr) 444 break; 445 446 if (value > ULONG_MAX / i->mult) 447 break; 448 value *= i->mult; 449 return value; 450 } 451 i++; 452 } 453 454 return (unsigned long) -1; 455 } 456 457 int get_stack_size(const char *str, unsigned long *_size) 458 { 459 char *endptr; 460 unsigned long size; 461 unsigned long max_size = round_down(USHRT_MAX, sizeof(u64)); 462 463 size = strtoul(str, &endptr, 0); 464 465 do { 466 if (*endptr) 467 break; 468 469 size = round_up(size, sizeof(u64)); 470 if (!size || size > max_size) 471 break; 472 473 *_size = size; 474 return 0; 475 476 } while (0); 477 478 pr_err("callchain: Incorrect stack dump size (max %ld): %s\n", 479 max_size, str); 480 return -1; 481 } 482 483 int parse_callchain_record(const char *arg, struct callchain_param *param) 484 { 485 char *tok, *name, *saveptr = NULL; 486 char *buf; 487 int ret = -1; 488 489 /* We need buffer that we know we can write to. */ 490 buf = malloc(strlen(arg) + 1); 491 if (!buf) 492 return -ENOMEM; 493 494 strcpy(buf, arg); 495 496 tok = strtok_r((char *)buf, ",", &saveptr); 497 name = tok ? : (char *)buf; 498 499 do { 500 /* Framepointer style */ 501 if (!strncmp(name, "fp", sizeof("fp"))) { 502 if (!strtok_r(NULL, ",", &saveptr)) { 503 param->record_mode = CALLCHAIN_FP; 504 ret = 0; 505 } else 506 pr_err("callchain: No more arguments " 507 "needed for --call-graph fp\n"); 508 break; 509 510 /* Dwarf style */ 511 } else if (!strncmp(name, "dwarf", sizeof("dwarf"))) { 512 const unsigned long default_stack_dump_size = 8192; 513 514 ret = 0; 515 param->record_mode = CALLCHAIN_DWARF; 516 param->dump_size = default_stack_dump_size; 517 518 tok = strtok_r(NULL, ",", &saveptr); 519 if (tok) { 520 unsigned long size = 0; 521 522 ret = get_stack_size(tok, &size); 523 param->dump_size = size; 524 } 525 } else if (!strncmp(name, "lbr", sizeof("lbr"))) { 526 if (!strtok_r(NULL, ",", &saveptr)) { 527 param->record_mode = CALLCHAIN_LBR; 528 ret = 0; 529 } else 530 pr_err("callchain: No more arguments " 531 "needed for --call-graph lbr\n"); 532 break; 533 } else { 534 pr_err("callchain: Unknown --call-graph option " 535 "value: %s\n", arg); 536 break; 537 } 538 539 } while (0); 540 541 free(buf); 542 return ret; 543 } 544 545 const char *get_filename_for_perf_kvm(void) 546 { 547 const char *filename; 548 549 if (perf_host && !perf_guest) 550 filename = strdup("perf.data.host"); 551 else if (!perf_host && perf_guest) 552 filename = strdup("perf.data.guest"); 553 else 554 filename = strdup("perf.data.kvm"); 555 556 return filename; 557 } 558 559 int perf_event_paranoid(void) 560 { 561 int value; 562 563 if (sysctl__read_int("kernel/perf_event_paranoid", &value)) 564 return INT_MAX; 565 566 return value; 567 } 568 569 void mem_bswap_32(void *src, int byte_size) 570 { 571 u32 *m = src; 572 while (byte_size > 0) { 573 *m = bswap_32(*m); 574 byte_size -= sizeof(u32); 575 ++m; 576 } 577 } 578 579 void mem_bswap_64(void *src, int byte_size) 580 { 581 u64 *m = src; 582 583 while (byte_size > 0) { 584 *m = bswap_64(*m); 585 byte_size -= sizeof(u64); 586 ++m; 587 } 588 } 589 590 bool find_process(const char *name) 591 { 592 size_t len = strlen(name); 593 DIR *dir; 594 struct dirent *d; 595 int ret = -1; 596 597 dir = opendir(procfs__mountpoint()); 598 if (!dir) 599 return false; 600 601 /* Walk through the directory. */ 602 while (ret && (d = readdir(dir)) != NULL) { 603 char path[PATH_MAX]; 604 char *data; 605 size_t size; 606 607 if ((d->d_type != DT_DIR) || 608 !strcmp(".", d->d_name) || 609 !strcmp("..", d->d_name)) 610 continue; 611 612 scnprintf(path, sizeof(path), "%s/%s/comm", 613 procfs__mountpoint(), d->d_name); 614 615 if (filename__read_str(path, &data, &size)) 616 continue; 617 618 ret = strncmp(name, data, len); 619 free(data); 620 } 621 622 closedir(dir); 623 return ret ? false : true; 624 } 625 626 int 627 fetch_kernel_version(unsigned int *puint, char *str, 628 size_t str_size) 629 { 630 struct utsname utsname; 631 int version, patchlevel, sublevel, err; 632 633 if (uname(&utsname)) 634 return -1; 635 636 if (str && str_size) { 637 strncpy(str, utsname.release, str_size); 638 str[str_size - 1] = '\0'; 639 } 640 641 err = sscanf(utsname.release, "%d.%d.%d", 642 &version, &patchlevel, &sublevel); 643 644 if (err != 3) { 645 pr_debug("Unablt to get kernel version from uname '%s'\n", 646 utsname.release); 647 return -1; 648 } 649 650 if (puint) 651 *puint = (version << 16) + (patchlevel << 8) + sublevel; 652 return 0; 653 } 654 655 const char *perf_tip(const char *dirpath) 656 { 657 struct strlist *tips; 658 struct str_node *node; 659 char *tip = NULL; 660 struct strlist_config conf = { 661 .dirname = dirpath, 662 .file_only = true, 663 }; 664 665 tips = strlist__new("tips.txt", &conf); 666 if (tips == NULL) 667 return errno == ENOENT ? NULL : "Tip: get more memory! ;-p"; 668 669 if (strlist__nr_entries(tips) == 0) 670 goto out; 671 672 node = strlist__entry(tips, random() % strlist__nr_entries(tips)); 673 if (asprintf(&tip, "Tip: %s", node->s) < 0) 674 tip = (char *)"Tip: get more memory! ;-)"; 675 676 out: 677 strlist__delete(tips); 678 679 return tip; 680 } 681 682 bool is_regular_file(const char *file) 683 { 684 struct stat st; 685 686 if (stat(file, &st)) 687 return false; 688 689 return S_ISREG(st.st_mode); 690 } 691 692 int fetch_current_timestamp(char *buf, size_t sz) 693 { 694 struct timeval tv; 695 struct tm tm; 696 char dt[32]; 697 698 if (gettimeofday(&tv, NULL) || !localtime_r(&tv.tv_sec, &tm)) 699 return -1; 700 701 if (!strftime(dt, sizeof(dt), "%Y%m%d%H%M%S", &tm)) 702 return -1; 703 704 scnprintf(buf, sz, "%s%02u", dt, (unsigned)tv.tv_usec / 10000); 705 706 return 0; 707 } 708 709 void print_binary(unsigned char *data, size_t len, 710 size_t bytes_per_line, print_binary_t printer, 711 void *extra) 712 { 713 size_t i, j, mask; 714 715 if (!printer) 716 return; 717 718 bytes_per_line = roundup_pow_of_two(bytes_per_line); 719 mask = bytes_per_line - 1; 720 721 printer(BINARY_PRINT_DATA_BEGIN, 0, extra); 722 for (i = 0; i < len; i++) { 723 if ((i & mask) == 0) { 724 printer(BINARY_PRINT_LINE_BEGIN, -1, extra); 725 printer(BINARY_PRINT_ADDR, i, extra); 726 } 727 728 printer(BINARY_PRINT_NUM_DATA, data[i], extra); 729 730 if (((i & mask) == mask) || i == len - 1) { 731 for (j = 0; j < mask-(i & mask); j++) 732 printer(BINARY_PRINT_NUM_PAD, -1, extra); 733 734 printer(BINARY_PRINT_SEP, i, extra); 735 for (j = i & ~mask; j <= i; j++) 736 printer(BINARY_PRINT_CHAR_DATA, data[j], extra); 737 for (j = 0; j < mask-(i & mask); j++) 738 printer(BINARY_PRINT_CHAR_PAD, i, extra); 739 printer(BINARY_PRINT_LINE_END, -1, extra); 740 } 741 } 742 printer(BINARY_PRINT_DATA_END, -1, extra); 743 } 744