tools/perf/util/util.c

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