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