1 #include "callchain.h" 2 #include "debug.h" 3 #include "event.h" 4 #include "evsel.h" 5 #include "hist.h" 6 #include "machine.h" 7 #include "map.h" 8 #include "sort.h" 9 #include "strlist.h" 10 #include "thread.h" 11 #include <stdbool.h> 12 #include <symbol/kallsyms.h> 13 #include "unwind.h" 14 15 int machine__init(struct machine *machine, const char *root_dir, pid_t pid) 16 { 17 map_groups__init(&machine->kmaps); 18 RB_CLEAR_NODE(&machine->rb_node); 19 INIT_LIST_HEAD(&machine->user_dsos); 20 INIT_LIST_HEAD(&machine->kernel_dsos); 21 22 machine->threads = RB_ROOT; 23 INIT_LIST_HEAD(&machine->dead_threads); 24 machine->last_match = NULL; 25 26 machine->kmaps.machine = machine; 27 machine->pid = pid; 28 29 machine->symbol_filter = NULL; 30 31 machine->root_dir = strdup(root_dir); 32 if (machine->root_dir == NULL) 33 return -ENOMEM; 34 35 if (pid != HOST_KERNEL_ID) { 36 struct thread *thread = machine__findnew_thread(machine, 0, 37 pid); 38 char comm[64]; 39 40 if (thread == NULL) 41 return -ENOMEM; 42 43 snprintf(comm, sizeof(comm), "[guest/%d]", pid); 44 thread__set_comm(thread, comm, 0); 45 } 46 47 return 0; 48 } 49 50 struct machine *machine__new_host(void) 51 { 52 struct machine *machine = malloc(sizeof(*machine)); 53 54 if (machine != NULL) { 55 machine__init(machine, "", HOST_KERNEL_ID); 56 57 if (machine__create_kernel_maps(machine) < 0) 58 goto out_delete; 59 } 60 61 return machine; 62 out_delete: 63 free(machine); 64 return NULL; 65 } 66 67 static void dsos__delete(struct list_head *dsos) 68 { 69 struct dso *pos, *n; 70 71 list_for_each_entry_safe(pos, n, dsos, node) { 72 list_del(&pos->node); 73 dso__delete(pos); 74 } 75 } 76 77 void machine__delete_dead_threads(struct machine *machine) 78 { 79 struct thread *n, *t; 80 81 list_for_each_entry_safe(t, n, &machine->dead_threads, node) { 82 list_del(&t->node); 83 thread__delete(t); 84 } 85 } 86 87 void machine__delete_threads(struct machine *machine) 88 { 89 struct rb_node *nd = rb_first(&machine->threads); 90 91 while (nd) { 92 struct thread *t = rb_entry(nd, struct thread, rb_node); 93 94 rb_erase(&t->rb_node, &machine->threads); 95 nd = rb_next(nd); 96 thread__delete(t); 97 } 98 } 99 100 void machine__exit(struct machine *machine) 101 { 102 map_groups__exit(&machine->kmaps); 103 dsos__delete(&machine->user_dsos); 104 dsos__delete(&machine->kernel_dsos); 105 free(machine->root_dir); 106 machine->root_dir = NULL; 107 } 108 109 void machine__delete(struct machine *machine) 110 { 111 machine__exit(machine); 112 free(machine); 113 } 114 115 void machines__init(struct machines *machines) 116 { 117 machine__init(&machines->host, "", HOST_KERNEL_ID); 118 machines->guests = RB_ROOT; 119 machines->symbol_filter = NULL; 120 } 121 122 void machines__exit(struct machines *machines) 123 { 124 machine__exit(&machines->host); 125 /* XXX exit guest */ 126 } 127 128 struct machine *machines__add(struct machines *machines, pid_t pid, 129 const char *root_dir) 130 { 131 struct rb_node **p = &machines->guests.rb_node; 132 struct rb_node *parent = NULL; 133 struct machine *pos, *machine = malloc(sizeof(*machine)); 134 135 if (machine == NULL) 136 return NULL; 137 138 if (machine__init(machine, root_dir, pid) != 0) { 139 free(machine); 140 return NULL; 141 } 142 143 machine->symbol_filter = machines->symbol_filter; 144 145 while (*p != NULL) { 146 parent = *p; 147 pos = rb_entry(parent, struct machine, rb_node); 148 if (pid < pos->pid) 149 p = &(*p)->rb_left; 150 else 151 p = &(*p)->rb_right; 152 } 153 154 rb_link_node(&machine->rb_node, parent, p); 155 rb_insert_color(&machine->rb_node, &machines->guests); 156 157 return machine; 158 } 159 160 void machines__set_symbol_filter(struct machines *machines, 161 symbol_filter_t symbol_filter) 162 { 163 struct rb_node *nd; 164 165 machines->symbol_filter = symbol_filter; 166 machines->host.symbol_filter = symbol_filter; 167 168 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 169 struct machine *machine = rb_entry(nd, struct machine, rb_node); 170 171 machine->symbol_filter = symbol_filter; 172 } 173 } 174 175 struct machine *machines__find(struct machines *machines, pid_t pid) 176 { 177 struct rb_node **p = &machines->guests.rb_node; 178 struct rb_node *parent = NULL; 179 struct machine *machine; 180 struct machine *default_machine = NULL; 181 182 if (pid == HOST_KERNEL_ID) 183 return &machines->host; 184 185 while (*p != NULL) { 186 parent = *p; 187 machine = rb_entry(parent, struct machine, rb_node); 188 if (pid < machine->pid) 189 p = &(*p)->rb_left; 190 else if (pid > machine->pid) 191 p = &(*p)->rb_right; 192 else 193 return machine; 194 if (!machine->pid) 195 default_machine = machine; 196 } 197 198 return default_machine; 199 } 200 201 struct machine *machines__findnew(struct machines *machines, pid_t pid) 202 { 203 char path[PATH_MAX]; 204 const char *root_dir = ""; 205 struct machine *machine = machines__find(machines, pid); 206 207 if (machine && (machine->pid == pid)) 208 goto out; 209 210 if ((pid != HOST_KERNEL_ID) && 211 (pid != DEFAULT_GUEST_KERNEL_ID) && 212 (symbol_conf.guestmount)) { 213 sprintf(path, "%s/%d", symbol_conf.guestmount, pid); 214 if (access(path, R_OK)) { 215 static struct strlist *seen; 216 217 if (!seen) 218 seen = strlist__new(true, NULL); 219 220 if (!strlist__has_entry(seen, path)) { 221 pr_err("Can't access file %s\n", path); 222 strlist__add(seen, path); 223 } 224 machine = NULL; 225 goto out; 226 } 227 root_dir = path; 228 } 229 230 machine = machines__add(machines, pid, root_dir); 231 out: 232 return machine; 233 } 234 235 void machines__process_guests(struct machines *machines, 236 machine__process_t process, void *data) 237 { 238 struct rb_node *nd; 239 240 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 241 struct machine *pos = rb_entry(nd, struct machine, rb_node); 242 process(pos, data); 243 } 244 } 245 246 char *machine__mmap_name(struct machine *machine, char *bf, size_t size) 247 { 248 if (machine__is_host(machine)) 249 snprintf(bf, size, "[%s]", "kernel.kallsyms"); 250 else if (machine__is_default_guest(machine)) 251 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms"); 252 else { 253 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms", 254 machine->pid); 255 } 256 257 return bf; 258 } 259 260 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size) 261 { 262 struct rb_node *node; 263 struct machine *machine; 264 265 machines->host.id_hdr_size = id_hdr_size; 266 267 for (node = rb_first(&machines->guests); node; node = rb_next(node)) { 268 machine = rb_entry(node, struct machine, rb_node); 269 machine->id_hdr_size = id_hdr_size; 270 } 271 272 return; 273 } 274 275 static struct thread *__machine__findnew_thread(struct machine *machine, 276 pid_t pid, pid_t tid, 277 bool create) 278 { 279 struct rb_node **p = &machine->threads.rb_node; 280 struct rb_node *parent = NULL; 281 struct thread *th; 282 283 /* 284 * Front-end cache - TID lookups come in blocks, 285 * so most of the time we dont have to look up 286 * the full rbtree: 287 */ 288 if (machine->last_match && machine->last_match->tid == tid) { 289 if (pid && pid != machine->last_match->pid_) 290 machine->last_match->pid_ = pid; 291 return machine->last_match; 292 } 293 294 while (*p != NULL) { 295 parent = *p; 296 th = rb_entry(parent, struct thread, rb_node); 297 298 if (th->tid == tid) { 299 machine->last_match = th; 300 if (pid && pid != th->pid_) 301 th->pid_ = pid; 302 return th; 303 } 304 305 if (tid < th->tid) 306 p = &(*p)->rb_left; 307 else 308 p = &(*p)->rb_right; 309 } 310 311 if (!create) 312 return NULL; 313 314 th = thread__new(pid, tid); 315 if (th != NULL) { 316 rb_link_node(&th->rb_node, parent, p); 317 rb_insert_color(&th->rb_node, &machine->threads); 318 machine->last_match = th; 319 } 320 321 return th; 322 } 323 324 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid, 325 pid_t tid) 326 { 327 return __machine__findnew_thread(machine, pid, tid, true); 328 } 329 330 struct thread *machine__find_thread(struct machine *machine, pid_t tid) 331 { 332 return __machine__findnew_thread(machine, 0, tid, false); 333 } 334 335 int machine__process_comm_event(struct machine *machine, union perf_event *event, 336 struct perf_sample *sample) 337 { 338 struct thread *thread = machine__findnew_thread(machine, 339 event->comm.pid, 340 event->comm.tid); 341 342 if (dump_trace) 343 perf_event__fprintf_comm(event, stdout); 344 345 if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) { 346 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n"); 347 return -1; 348 } 349 350 return 0; 351 } 352 353 int machine__process_lost_event(struct machine *machine __maybe_unused, 354 union perf_event *event, struct perf_sample *sample __maybe_unused) 355 { 356 dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n", 357 event->lost.id, event->lost.lost); 358 return 0; 359 } 360 361 struct map *machine__new_module(struct machine *machine, u64 start, 362 const char *filename) 363 { 364 struct map *map; 365 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename); 366 367 if (dso == NULL) 368 return NULL; 369 370 map = map__new2(start, dso, MAP__FUNCTION); 371 if (map == NULL) 372 return NULL; 373 374 if (machine__is_host(machine)) 375 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE; 376 else 377 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE; 378 map_groups__insert(&machine->kmaps, map); 379 return map; 380 } 381 382 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp) 383 { 384 struct rb_node *nd; 385 size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) + 386 __dsos__fprintf(&machines->host.user_dsos, fp); 387 388 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 389 struct machine *pos = rb_entry(nd, struct machine, rb_node); 390 ret += __dsos__fprintf(&pos->kernel_dsos, fp); 391 ret += __dsos__fprintf(&pos->user_dsos, fp); 392 } 393 394 return ret; 395 } 396 397 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp, 398 bool (skip)(struct dso *dso, int parm), int parm) 399 { 400 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) + 401 __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm); 402 } 403 404 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp, 405 bool (skip)(struct dso *dso, int parm), int parm) 406 { 407 struct rb_node *nd; 408 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm); 409 410 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { 411 struct machine *pos = rb_entry(nd, struct machine, rb_node); 412 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm); 413 } 414 return ret; 415 } 416 417 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) 418 { 419 int i; 420 size_t printed = 0; 421 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso; 422 423 if (kdso->has_build_id) { 424 char filename[PATH_MAX]; 425 if (dso__build_id_filename(kdso, filename, sizeof(filename))) 426 printed += fprintf(fp, "[0] %s\n", filename); 427 } 428 429 for (i = 0; i < vmlinux_path__nr_entries; ++i) 430 printed += fprintf(fp, "[%d] %s\n", 431 i + kdso->has_build_id, vmlinux_path[i]); 432 433 return printed; 434 } 435 436 size_t machine__fprintf(struct machine *machine, FILE *fp) 437 { 438 size_t ret = 0; 439 struct rb_node *nd; 440 441 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) { 442 struct thread *pos = rb_entry(nd, struct thread, rb_node); 443 444 ret += thread__fprintf(pos, fp); 445 } 446 447 return ret; 448 } 449 450 static struct dso *machine__get_kernel(struct machine *machine) 451 { 452 const char *vmlinux_name = NULL; 453 struct dso *kernel; 454 455 if (machine__is_host(machine)) { 456 vmlinux_name = symbol_conf.vmlinux_name; 457 if (!vmlinux_name) 458 vmlinux_name = "[kernel.kallsyms]"; 459 460 kernel = dso__kernel_findnew(machine, vmlinux_name, 461 "[kernel]", 462 DSO_TYPE_KERNEL); 463 } else { 464 char bf[PATH_MAX]; 465 466 if (machine__is_default_guest(machine)) 467 vmlinux_name = symbol_conf.default_guest_vmlinux_name; 468 if (!vmlinux_name) 469 vmlinux_name = machine__mmap_name(machine, bf, 470 sizeof(bf)); 471 472 kernel = dso__kernel_findnew(machine, vmlinux_name, 473 "[guest.kernel]", 474 DSO_TYPE_GUEST_KERNEL); 475 } 476 477 if (kernel != NULL && (!kernel->has_build_id)) 478 dso__read_running_kernel_build_id(kernel, machine); 479 480 return kernel; 481 } 482 483 struct process_args { 484 u64 start; 485 }; 486 487 static int symbol__in_kernel(void *arg, const char *name, 488 char type __maybe_unused, u64 start) 489 { 490 struct process_args *args = arg; 491 492 if (strchr(name, '[')) 493 return 0; 494 495 args->start = start; 496 return 1; 497 } 498 499 /* Figure out the start address of kernel map from /proc/kallsyms */ 500 static u64 machine__get_kernel_start_addr(struct machine *machine) 501 { 502 const char *filename; 503 char path[PATH_MAX]; 504 struct process_args args; 505 506 if (machine__is_default_guest(machine)) 507 filename = (char *)symbol_conf.default_guest_kallsyms; 508 else { 509 sprintf(path, "%s/proc/kallsyms", machine->root_dir); 510 filename = path; 511 } 512 513 if (symbol__restricted_filename(filename, "/proc/kallsyms")) 514 return 0; 515 516 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0) 517 return 0; 518 519 return args.start; 520 } 521 522 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel) 523 { 524 enum map_type type; 525 u64 start = machine__get_kernel_start_addr(machine); 526 527 for (type = 0; type < MAP__NR_TYPES; ++type) { 528 struct kmap *kmap; 529 530 machine->vmlinux_maps[type] = map__new2(start, kernel, type); 531 if (machine->vmlinux_maps[type] == NULL) 532 return -1; 533 534 machine->vmlinux_maps[type]->map_ip = 535 machine->vmlinux_maps[type]->unmap_ip = 536 identity__map_ip; 537 kmap = map__kmap(machine->vmlinux_maps[type]); 538 kmap->kmaps = &machine->kmaps; 539 map_groups__insert(&machine->kmaps, 540 machine->vmlinux_maps[type]); 541 } 542 543 return 0; 544 } 545 546 void machine__destroy_kernel_maps(struct machine *machine) 547 { 548 enum map_type type; 549 550 for (type = 0; type < MAP__NR_TYPES; ++type) { 551 struct kmap *kmap; 552 553 if (machine->vmlinux_maps[type] == NULL) 554 continue; 555 556 kmap = map__kmap(machine->vmlinux_maps[type]); 557 map_groups__remove(&machine->kmaps, 558 machine->vmlinux_maps[type]); 559 if (kmap->ref_reloc_sym) { 560 /* 561 * ref_reloc_sym is shared among all maps, so free just 562 * on one of them. 563 */ 564 if (type == MAP__FUNCTION) { 565 free((char *)kmap->ref_reloc_sym->name); 566 kmap->ref_reloc_sym->name = NULL; 567 free(kmap->ref_reloc_sym); 568 } 569 kmap->ref_reloc_sym = NULL; 570 } 571 572 map__delete(machine->vmlinux_maps[type]); 573 machine->vmlinux_maps[type] = NULL; 574 } 575 } 576 577 int machines__create_guest_kernel_maps(struct machines *machines) 578 { 579 int ret = 0; 580 struct dirent **namelist = NULL; 581 int i, items = 0; 582 char path[PATH_MAX]; 583 pid_t pid; 584 char *endp; 585 586 if (symbol_conf.default_guest_vmlinux_name || 587 symbol_conf.default_guest_modules || 588 symbol_conf.default_guest_kallsyms) { 589 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID); 590 } 591 592 if (symbol_conf.guestmount) { 593 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL); 594 if (items <= 0) 595 return -ENOENT; 596 for (i = 0; i < items; i++) { 597 if (!isdigit(namelist[i]->d_name[0])) { 598 /* Filter out . and .. */ 599 continue; 600 } 601 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10); 602 if ((*endp != '\0') || 603 (endp == namelist[i]->d_name) || 604 (errno == ERANGE)) { 605 pr_debug("invalid directory (%s). Skipping.\n", 606 namelist[i]->d_name); 607 continue; 608 } 609 sprintf(path, "%s/%s/proc/kallsyms", 610 symbol_conf.guestmount, 611 namelist[i]->d_name); 612 ret = access(path, R_OK); 613 if (ret) { 614 pr_debug("Can't access file %s\n", path); 615 goto failure; 616 } 617 machines__create_kernel_maps(machines, pid); 618 } 619 failure: 620 free(namelist); 621 } 622 623 return ret; 624 } 625 626 void machines__destroy_kernel_maps(struct machines *machines) 627 { 628 struct rb_node *next = rb_first(&machines->guests); 629 630 machine__destroy_kernel_maps(&machines->host); 631 632 while (next) { 633 struct machine *pos = rb_entry(next, struct machine, rb_node); 634 635 next = rb_next(&pos->rb_node); 636 rb_erase(&pos->rb_node, &machines->guests); 637 machine__delete(pos); 638 } 639 } 640 641 int machines__create_kernel_maps(struct machines *machines, pid_t pid) 642 { 643 struct machine *machine = machines__findnew(machines, pid); 644 645 if (machine == NULL) 646 return -1; 647 648 return machine__create_kernel_maps(machine); 649 } 650 651 int machine__load_kallsyms(struct machine *machine, const char *filename, 652 enum map_type type, symbol_filter_t filter) 653 { 654 struct map *map = machine->vmlinux_maps[type]; 655 int ret = dso__load_kallsyms(map->dso, filename, map, filter); 656 657 if (ret > 0) { 658 dso__set_loaded(map->dso, type); 659 /* 660 * Since /proc/kallsyms will have multiple sessions for the 661 * kernel, with modules between them, fixup the end of all 662 * sections. 663 */ 664 __map_groups__fixup_end(&machine->kmaps, type); 665 } 666 667 return ret; 668 } 669 670 int machine__load_vmlinux_path(struct machine *machine, enum map_type type, 671 symbol_filter_t filter) 672 { 673 struct map *map = machine->vmlinux_maps[type]; 674 int ret = dso__load_vmlinux_path(map->dso, map, filter); 675 676 if (ret > 0) 677 dso__set_loaded(map->dso, type); 678 679 return ret; 680 } 681 682 static void map_groups__fixup_end(struct map_groups *mg) 683 { 684 int i; 685 for (i = 0; i < MAP__NR_TYPES; ++i) 686 __map_groups__fixup_end(mg, i); 687 } 688 689 static char *get_kernel_version(const char *root_dir) 690 { 691 char version[PATH_MAX]; 692 FILE *file; 693 char *name, *tmp; 694 const char *prefix = "Linux version "; 695 696 sprintf(version, "%s/proc/version", root_dir); 697 file = fopen(version, "r"); 698 if (!file) 699 return NULL; 700 701 version[0] = '\0'; 702 tmp = fgets(version, sizeof(version), file); 703 fclose(file); 704 705 name = strstr(version, prefix); 706 if (!name) 707 return NULL; 708 name += strlen(prefix); 709 tmp = strchr(name, ' '); 710 if (tmp) 711 *tmp = '\0'; 712 713 return strdup(name); 714 } 715 716 static int map_groups__set_modules_path_dir(struct map_groups *mg, 717 const char *dir_name) 718 { 719 struct dirent *dent; 720 DIR *dir = opendir(dir_name); 721 int ret = 0; 722 723 if (!dir) { 724 pr_debug("%s: cannot open %s dir\n", __func__, dir_name); 725 return -1; 726 } 727 728 while ((dent = readdir(dir)) != NULL) { 729 char path[PATH_MAX]; 730 struct stat st; 731 732 /*sshfs might return bad dent->d_type, so we have to stat*/ 733 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); 734 if (stat(path, &st)) 735 continue; 736 737 if (S_ISDIR(st.st_mode)) { 738 if (!strcmp(dent->d_name, ".") || 739 !strcmp(dent->d_name, "..")) 740 continue; 741 742 ret = map_groups__set_modules_path_dir(mg, path); 743 if (ret < 0) 744 goto out; 745 } else { 746 char *dot = strrchr(dent->d_name, '.'), 747 dso_name[PATH_MAX]; 748 struct map *map; 749 char *long_name; 750 751 if (dot == NULL || strcmp(dot, ".ko")) 752 continue; 753 snprintf(dso_name, sizeof(dso_name), "[%.*s]", 754 (int)(dot - dent->d_name), dent->d_name); 755 756 strxfrchar(dso_name, '-', '_'); 757 map = map_groups__find_by_name(mg, MAP__FUNCTION, 758 dso_name); 759 if (map == NULL) 760 continue; 761 762 long_name = strdup(path); 763 if (long_name == NULL) { 764 ret = -1; 765 goto out; 766 } 767 dso__set_long_name(map->dso, long_name, true); 768 dso__kernel_module_get_build_id(map->dso, ""); 769 } 770 } 771 772 out: 773 closedir(dir); 774 return ret; 775 } 776 777 static int machine__set_modules_path(struct machine *machine) 778 { 779 char *version; 780 char modules_path[PATH_MAX]; 781 782 version = get_kernel_version(machine->root_dir); 783 if (!version) 784 return -1; 785 786 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel", 787 machine->root_dir, version); 788 free(version); 789 790 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path); 791 } 792 793 static int machine__create_module(void *arg, const char *name, u64 start) 794 { 795 struct machine *machine = arg; 796 struct map *map; 797 798 map = machine__new_module(machine, start, name); 799 if (map == NULL) 800 return -1; 801 802 dso__kernel_module_get_build_id(map->dso, machine->root_dir); 803 804 return 0; 805 } 806 807 static int machine__create_modules(struct machine *machine) 808 { 809 const char *modules; 810 char path[PATH_MAX]; 811 812 if (machine__is_default_guest(machine)) { 813 modules = symbol_conf.default_guest_modules; 814 } else { 815 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir); 816 modules = path; 817 } 818 819 if (symbol__restricted_filename(modules, "/proc/modules")) 820 return -1; 821 822 if (modules__parse(modules, machine, machine__create_module)) 823 return -1; 824 825 if (!machine__set_modules_path(machine)) 826 return 0; 827 828 pr_debug("Problems setting modules path maps, continuing anyway...\n"); 829 830 return 0; 831 } 832 833 int machine__create_kernel_maps(struct machine *machine) 834 { 835 struct dso *kernel = machine__get_kernel(machine); 836 837 if (kernel == NULL || 838 __machine__create_kernel_maps(machine, kernel) < 0) 839 return -1; 840 841 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) { 842 if (machine__is_host(machine)) 843 pr_debug("Problems creating module maps, " 844 "continuing anyway...\n"); 845 else 846 pr_debug("Problems creating module maps for guest %d, " 847 "continuing anyway...\n", machine->pid); 848 } 849 850 /* 851 * Now that we have all the maps created, just set the ->end of them: 852 */ 853 map_groups__fixup_end(&machine->kmaps); 854 return 0; 855 } 856 857 static void machine__set_kernel_mmap_len(struct machine *machine, 858 union perf_event *event) 859 { 860 int i; 861 862 for (i = 0; i < MAP__NR_TYPES; i++) { 863 machine->vmlinux_maps[i]->start = event->mmap.start; 864 machine->vmlinux_maps[i]->end = (event->mmap.start + 865 event->mmap.len); 866 /* 867 * Be a bit paranoid here, some perf.data file came with 868 * a zero sized synthesized MMAP event for the kernel. 869 */ 870 if (machine->vmlinux_maps[i]->end == 0) 871 machine->vmlinux_maps[i]->end = ~0ULL; 872 } 873 } 874 875 static bool machine__uses_kcore(struct machine *machine) 876 { 877 struct dso *dso; 878 879 list_for_each_entry(dso, &machine->kernel_dsos, node) { 880 if (dso__is_kcore(dso)) 881 return true; 882 } 883 884 return false; 885 } 886 887 static int machine__process_kernel_mmap_event(struct machine *machine, 888 union perf_event *event) 889 { 890 struct map *map; 891 char kmmap_prefix[PATH_MAX]; 892 enum dso_kernel_type kernel_type; 893 bool is_kernel_mmap; 894 895 /* If we have maps from kcore then we do not need or want any others */ 896 if (machine__uses_kcore(machine)) 897 return 0; 898 899 machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix)); 900 if (machine__is_host(machine)) 901 kernel_type = DSO_TYPE_KERNEL; 902 else 903 kernel_type = DSO_TYPE_GUEST_KERNEL; 904 905 is_kernel_mmap = memcmp(event->mmap.filename, 906 kmmap_prefix, 907 strlen(kmmap_prefix) - 1) == 0; 908 if (event->mmap.filename[0] == '/' || 909 (!is_kernel_mmap && event->mmap.filename[0] == '[')) { 910 911 char short_module_name[1024]; 912 char *name, *dot; 913 914 if (event->mmap.filename[0] == '/') { 915 name = strrchr(event->mmap.filename, '/'); 916 if (name == NULL) 917 goto out_problem; 918 919 ++name; /* skip / */ 920 dot = strrchr(name, '.'); 921 if (dot == NULL) 922 goto out_problem; 923 snprintf(short_module_name, sizeof(short_module_name), 924 "[%.*s]", (int)(dot - name), name); 925 strxfrchar(short_module_name, '-', '_'); 926 } else 927 strcpy(short_module_name, event->mmap.filename); 928 929 map = machine__new_module(machine, event->mmap.start, 930 event->mmap.filename); 931 if (map == NULL) 932 goto out_problem; 933 934 name = strdup(short_module_name); 935 if (name == NULL) 936 goto out_problem; 937 938 dso__set_short_name(map->dso, name, true); 939 map->end = map->start + event->mmap.len; 940 } else if (is_kernel_mmap) { 941 const char *symbol_name = (event->mmap.filename + 942 strlen(kmmap_prefix)); 943 /* 944 * Should be there already, from the build-id table in 945 * the header. 946 */ 947 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos, 948 kmmap_prefix); 949 if (kernel == NULL) 950 goto out_problem; 951 952 kernel->kernel = kernel_type; 953 if (__machine__create_kernel_maps(machine, kernel) < 0) 954 goto out_problem; 955 956 machine__set_kernel_mmap_len(machine, event); 957 958 /* 959 * Avoid using a zero address (kptr_restrict) for the ref reloc 960 * symbol. Effectively having zero here means that at record 961 * time /proc/sys/kernel/kptr_restrict was non zero. 962 */ 963 if (event->mmap.pgoff != 0) { 964 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, 965 symbol_name, 966 event->mmap.pgoff); 967 } 968 969 if (machine__is_default_guest(machine)) { 970 /* 971 * preload dso of guest kernel and modules 972 */ 973 dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION], 974 NULL); 975 } 976 } 977 return 0; 978 out_problem: 979 return -1; 980 } 981 982 int machine__process_mmap2_event(struct machine *machine, 983 union perf_event *event, 984 struct perf_sample *sample __maybe_unused) 985 { 986 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 987 struct thread *thread; 988 struct map *map; 989 enum map_type type; 990 int ret = 0; 991 992 if (dump_trace) 993 perf_event__fprintf_mmap2(event, stdout); 994 995 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL || 996 cpumode == PERF_RECORD_MISC_KERNEL) { 997 ret = machine__process_kernel_mmap_event(machine, event); 998 if (ret < 0) 999 goto out_problem; 1000 return 0; 1001 } 1002 1003 thread = machine__findnew_thread(machine, event->mmap2.pid, 1004 event->mmap2.pid); 1005 if (thread == NULL) 1006 goto out_problem; 1007 1008 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) 1009 type = MAP__VARIABLE; 1010 else 1011 type = MAP__FUNCTION; 1012 1013 map = map__new(&machine->user_dsos, event->mmap2.start, 1014 event->mmap2.len, event->mmap2.pgoff, 1015 event->mmap2.pid, event->mmap2.maj, 1016 event->mmap2.min, event->mmap2.ino, 1017 event->mmap2.ino_generation, 1018 event->mmap2.filename, type); 1019 1020 if (map == NULL) 1021 goto out_problem; 1022 1023 thread__insert_map(thread, map); 1024 return 0; 1025 1026 out_problem: 1027 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n"); 1028 return 0; 1029 } 1030 1031 int machine__process_mmap_event(struct machine *machine, union perf_event *event, 1032 struct perf_sample *sample __maybe_unused) 1033 { 1034 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; 1035 struct thread *thread; 1036 struct map *map; 1037 enum map_type type; 1038 int ret = 0; 1039 1040 if (dump_trace) 1041 perf_event__fprintf_mmap(event, stdout); 1042 1043 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL || 1044 cpumode == PERF_RECORD_MISC_KERNEL) { 1045 ret = machine__process_kernel_mmap_event(machine, event); 1046 if (ret < 0) 1047 goto out_problem; 1048 return 0; 1049 } 1050 1051 thread = machine__findnew_thread(machine, event->mmap.pid, 1052 event->mmap.pid); 1053 if (thread == NULL) 1054 goto out_problem; 1055 1056 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) 1057 type = MAP__VARIABLE; 1058 else 1059 type = MAP__FUNCTION; 1060 1061 map = map__new(&machine->user_dsos, event->mmap.start, 1062 event->mmap.len, event->mmap.pgoff, 1063 event->mmap.pid, 0, 0, 0, 0, 1064 event->mmap.filename, 1065 type); 1066 1067 if (map == NULL) 1068 goto out_problem; 1069 1070 thread__insert_map(thread, map); 1071 return 0; 1072 1073 out_problem: 1074 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n"); 1075 return 0; 1076 } 1077 1078 static void machine__remove_thread(struct machine *machine, struct thread *th) 1079 { 1080 machine->last_match = NULL; 1081 rb_erase(&th->rb_node, &machine->threads); 1082 /* 1083 * We may have references to this thread, for instance in some hist_entry 1084 * instances, so just move them to a separate list. 1085 */ 1086 list_add_tail(&th->node, &machine->dead_threads); 1087 } 1088 1089 int machine__process_fork_event(struct machine *machine, union perf_event *event, 1090 struct perf_sample *sample) 1091 { 1092 struct thread *thread = machine__find_thread(machine, event->fork.tid); 1093 struct thread *parent = machine__findnew_thread(machine, 1094 event->fork.ppid, 1095 event->fork.ptid); 1096 1097 /* if a thread currently exists for the thread id remove it */ 1098 if (thread != NULL) 1099 machine__remove_thread(machine, thread); 1100 1101 thread = machine__findnew_thread(machine, event->fork.pid, 1102 event->fork.tid); 1103 if (dump_trace) 1104 perf_event__fprintf_task(event, stdout); 1105 1106 if (thread == NULL || parent == NULL || 1107 thread__fork(thread, parent, sample->time) < 0) { 1108 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n"); 1109 return -1; 1110 } 1111 1112 return 0; 1113 } 1114 1115 int machine__process_exit_event(struct machine *machine, union perf_event *event, 1116 struct perf_sample *sample __maybe_unused) 1117 { 1118 struct thread *thread = machine__find_thread(machine, event->fork.tid); 1119 1120 if (dump_trace) 1121 perf_event__fprintf_task(event, stdout); 1122 1123 if (thread != NULL) 1124 thread__exited(thread); 1125 1126 return 0; 1127 } 1128 1129 int machine__process_event(struct machine *machine, union perf_event *event, 1130 struct perf_sample *sample) 1131 { 1132 int ret; 1133 1134 switch (event->header.type) { 1135 case PERF_RECORD_COMM: 1136 ret = machine__process_comm_event(machine, event, sample); break; 1137 case PERF_RECORD_MMAP: 1138 ret = machine__process_mmap_event(machine, event, sample); break; 1139 case PERF_RECORD_MMAP2: 1140 ret = machine__process_mmap2_event(machine, event, sample); break; 1141 case PERF_RECORD_FORK: 1142 ret = machine__process_fork_event(machine, event, sample); break; 1143 case PERF_RECORD_EXIT: 1144 ret = machine__process_exit_event(machine, event, sample); break; 1145 case PERF_RECORD_LOST: 1146 ret = machine__process_lost_event(machine, event, sample); break; 1147 default: 1148 ret = -1; 1149 break; 1150 } 1151 1152 return ret; 1153 } 1154 1155 static bool symbol__match_regex(struct symbol *sym, regex_t *regex) 1156 { 1157 if (sym->name && !regexec(regex, sym->name, 0, NULL, 0)) 1158 return 1; 1159 return 0; 1160 } 1161 1162 static const u8 cpumodes[] = { 1163 PERF_RECORD_MISC_USER, 1164 PERF_RECORD_MISC_KERNEL, 1165 PERF_RECORD_MISC_GUEST_USER, 1166 PERF_RECORD_MISC_GUEST_KERNEL 1167 }; 1168 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8)) 1169 1170 static void ip__resolve_ams(struct machine *machine, struct thread *thread, 1171 struct addr_map_symbol *ams, 1172 u64 ip) 1173 { 1174 struct addr_location al; 1175 size_t i; 1176 u8 m; 1177 1178 memset(&al, 0, sizeof(al)); 1179 1180 for (i = 0; i < NCPUMODES; i++) { 1181 m = cpumodes[i]; 1182 /* 1183 * We cannot use the header.misc hint to determine whether a 1184 * branch stack address is user, kernel, guest, hypervisor. 1185 * Branches may straddle the kernel/user/hypervisor boundaries. 1186 * Thus, we have to try consecutively until we find a match 1187 * or else, the symbol is unknown 1188 */ 1189 thread__find_addr_location(thread, machine, m, MAP__FUNCTION, 1190 ip, &al); 1191 if (al.sym) 1192 goto found; 1193 } 1194 found: 1195 ams->addr = ip; 1196 ams->al_addr = al.addr; 1197 ams->sym = al.sym; 1198 ams->map = al.map; 1199 } 1200 1201 static void ip__resolve_data(struct machine *machine, struct thread *thread, 1202 u8 m, struct addr_map_symbol *ams, u64 addr) 1203 { 1204 struct addr_location al; 1205 1206 memset(&al, 0, sizeof(al)); 1207 1208 thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr, 1209 &al); 1210 ams->addr = addr; 1211 ams->al_addr = al.addr; 1212 ams->sym = al.sym; 1213 ams->map = al.map; 1214 } 1215 1216 struct mem_info *machine__resolve_mem(struct machine *machine, 1217 struct thread *thr, 1218 struct perf_sample *sample, 1219 u8 cpumode) 1220 { 1221 struct mem_info *mi = zalloc(sizeof(*mi)); 1222 1223 if (!mi) 1224 return NULL; 1225 1226 ip__resolve_ams(machine, thr, &mi->iaddr, sample->ip); 1227 ip__resolve_data(machine, thr, cpumode, &mi->daddr, sample->addr); 1228 mi->data_src.val = sample->data_src; 1229 1230 return mi; 1231 } 1232 1233 struct branch_info *machine__resolve_bstack(struct machine *machine, 1234 struct thread *thr, 1235 struct branch_stack *bs) 1236 { 1237 struct branch_info *bi; 1238 unsigned int i; 1239 1240 bi = calloc(bs->nr, sizeof(struct branch_info)); 1241 if (!bi) 1242 return NULL; 1243 1244 for (i = 0; i < bs->nr; i++) { 1245 ip__resolve_ams(machine, thr, &bi[i].to, bs->entries[i].to); 1246 ip__resolve_ams(machine, thr, &bi[i].from, bs->entries[i].from); 1247 bi[i].flags = bs->entries[i].flags; 1248 } 1249 return bi; 1250 } 1251 1252 static int machine__resolve_callchain_sample(struct machine *machine, 1253 struct thread *thread, 1254 struct ip_callchain *chain, 1255 struct symbol **parent, 1256 struct addr_location *root_al, 1257 int max_stack) 1258 { 1259 u8 cpumode = PERF_RECORD_MISC_USER; 1260 int chain_nr = min(max_stack, (int)chain->nr); 1261 int i; 1262 int err; 1263 1264 callchain_cursor_reset(&callchain_cursor); 1265 1266 if (chain->nr > PERF_MAX_STACK_DEPTH) { 1267 pr_warning("corrupted callchain. skipping...\n"); 1268 return 0; 1269 } 1270 1271 for (i = 0; i < chain_nr; i++) { 1272 u64 ip; 1273 struct addr_location al; 1274 1275 if (callchain_param.order == ORDER_CALLEE) 1276 ip = chain->ips[i]; 1277 else 1278 ip = chain->ips[chain->nr - i - 1]; 1279 1280 if (ip >= PERF_CONTEXT_MAX) { 1281 switch (ip) { 1282 case PERF_CONTEXT_HV: 1283 cpumode = PERF_RECORD_MISC_HYPERVISOR; 1284 break; 1285 case PERF_CONTEXT_KERNEL: 1286 cpumode = PERF_RECORD_MISC_KERNEL; 1287 break; 1288 case PERF_CONTEXT_USER: 1289 cpumode = PERF_RECORD_MISC_USER; 1290 break; 1291 default: 1292 pr_debug("invalid callchain context: " 1293 "%"PRId64"\n", (s64) ip); 1294 /* 1295 * It seems the callchain is corrupted. 1296 * Discard all. 1297 */ 1298 callchain_cursor_reset(&callchain_cursor); 1299 return 0; 1300 } 1301 continue; 1302 } 1303 1304 al.filtered = false; 1305 thread__find_addr_location(thread, machine, cpumode, 1306 MAP__FUNCTION, ip, &al); 1307 if (al.sym != NULL) { 1308 if (sort__has_parent && !*parent && 1309 symbol__match_regex(al.sym, &parent_regex)) 1310 *parent = al.sym; 1311 else if (have_ignore_callees && root_al && 1312 symbol__match_regex(al.sym, &ignore_callees_regex)) { 1313 /* Treat this symbol as the root, 1314 forgetting its callees. */ 1315 *root_al = al; 1316 callchain_cursor_reset(&callchain_cursor); 1317 } 1318 if (!symbol_conf.use_callchain) 1319 break; 1320 } 1321 1322 err = callchain_cursor_append(&callchain_cursor, 1323 ip, al.map, al.sym); 1324 if (err) 1325 return err; 1326 } 1327 1328 return 0; 1329 } 1330 1331 static int unwind_entry(struct unwind_entry *entry, void *arg) 1332 { 1333 struct callchain_cursor *cursor = arg; 1334 return callchain_cursor_append(cursor, entry->ip, 1335 entry->map, entry->sym); 1336 } 1337 1338 int machine__resolve_callchain(struct machine *machine, 1339 struct perf_evsel *evsel, 1340 struct thread *thread, 1341 struct perf_sample *sample, 1342 struct symbol **parent, 1343 struct addr_location *root_al, 1344 int max_stack) 1345 { 1346 int ret; 1347 1348 ret = machine__resolve_callchain_sample(machine, thread, 1349 sample->callchain, parent, 1350 root_al, max_stack); 1351 if (ret) 1352 return ret; 1353 1354 /* Can we do dwarf post unwind? */ 1355 if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) && 1356 (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER))) 1357 return 0; 1358 1359 /* Bail out if nothing was captured. */ 1360 if ((!sample->user_regs.regs) || 1361 (!sample->user_stack.size)) 1362 return 0; 1363 1364 return unwind__get_entries(unwind_entry, &callchain_cursor, machine, 1365 thread, evsel->attr.sample_regs_user, 1366 sample, max_stack); 1367 1368 } 1369 1370 int machine__for_each_thread(struct machine *machine, 1371 int (*fn)(struct thread *thread, void *p), 1372 void *priv) 1373 { 1374 struct rb_node *nd; 1375 struct thread *thread; 1376 int rc = 0; 1377 1378 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) { 1379 thread = rb_entry(nd, struct thread, rb_node); 1380 rc = fn(thread, priv); 1381 if (rc != 0) 1382 return rc; 1383 } 1384 1385 list_for_each_entry(thread, &machine->dead_threads, node) { 1386 rc = fn(thread, priv); 1387 if (rc != 0) 1388 return rc; 1389 } 1390 return rc; 1391 } 1392 1393 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1394 struct target *target, struct thread_map *threads, 1395 perf_event__handler_t process, bool data_mmap) 1396 { 1397 if (target__has_task(target)) 1398 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); 1399 else if (target__has_cpu(target)) 1400 return perf_event__synthesize_threads(tool, process, machine, data_mmap); 1401 /* command specified */ 1402 return 0; 1403 } 1404