tools/perf/util/machine.c

   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         machine->id_hdr_size = 0;
  31
  32         machine->root_dir = strdup(root_dir);
  33         if (machine->root_dir == NULL)
  34                 return -ENOMEM;
  35
  36         if (pid != HOST_KERNEL_ID) {
  37                 struct thread *thread = machine__findnew_thread(machine, 0,
  38                                                                 pid);
  39                 char comm[64];
  40
  41                 if (thread == NULL)
  42                         return -ENOMEM;
  43
  44                 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
  45                 thread__set_comm(thread, comm, 0);
  46         }
  47
  48         return 0;
  49 }
  50
  51 struct machine *machine__new_host(void)
  52 {
  53         struct machine *machine = malloc(sizeof(*machine));
  54
  55         if (machine != NULL) {
  56                 machine__init(machine, "", HOST_KERNEL_ID);
  57
  58                 if (machine__create_kernel_maps(machine) < 0)
  59                         goto out_delete;
  60         }
  61
  62         return machine;
  63 out_delete:
  64         free(machine);
  65         return NULL;
  66 }
  67
  68 static void dsos__delete(struct list_head *dsos)
  69 {
  70         struct dso *pos, *n;
  71
  72         list_for_each_entry_safe(pos, n, dsos, node) {
  73                 list_del(&pos->node);
  74                 dso__delete(pos);
  75         }
  76 }
  77
  78 void machine__delete_dead_threads(struct machine *machine)
  79 {
  80         struct thread *n, *t;
  81
  82         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
  83                 list_del(&t->node);
  84                 thread__delete(t);
  85         }
  86 }
  87
  88 void machine__delete_threads(struct machine *machine)
  89 {
  90         struct rb_node *nd = rb_first(&machine->threads);
  91
  92         while (nd) {
  93                 struct thread *t = rb_entry(nd, struct thread, rb_node);
  94
  95                 rb_erase(&t->rb_node, &machine->threads);
  96                 nd = rb_next(nd);
  97                 thread__delete(t);
  98         }
  99 }
 100
 101 void machine__exit(struct machine *machine)
 102 {
 103         map_groups__exit(&machine->kmaps);
 104         dsos__delete(&machine->user_dsos);
 105         dsos__delete(&machine->kernel_dsos);
 106         zfree(&machine->root_dir);
 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 pid,
 331                                     pid_t tid)
 332 {
 333         return __machine__findnew_thread(machine, pid, tid, false);
 334 }
 335
 336 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 337                                 struct perf_sample *sample)
 338 {
 339         struct thread *thread = machine__findnew_thread(machine,
 340                                                         event->comm.pid,
 341                                                         event->comm.tid);
 342
 343         if (dump_trace)
 344                 perf_event__fprintf_comm(event, stdout);
 345
 346         if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
 347                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 348                 return -1;
 349         }
 350
 351         return 0;
 352 }
 353
 354 int machine__process_lost_event(struct machine *machine __maybe_unused,
 355                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 356 {
 357         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 358                     event->lost.id, event->lost.lost);
 359         return 0;
 360 }
 361
 362 struct map *machine__new_module(struct machine *machine, u64 start,
 363                                 const char *filename)
 364 {
 365         struct map *map;
 366         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 367
 368         if (dso == NULL)
 369                 return NULL;
 370
 371         map = map__new2(start, dso, MAP__FUNCTION);
 372         if (map == NULL)
 373                 return NULL;
 374
 375         if (machine__is_host(machine))
 376                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 377         else
 378                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 379         map_groups__insert(&machine->kmaps, map);
 380         return map;
 381 }
 382
 383 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 384 {
 385         struct rb_node *nd;
 386         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 387                      __dsos__fprintf(&machines->host.user_dsos, fp);
 388
 389         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 390                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 391                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 392                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 393         }
 394
 395         return ret;
 396 }
 397
 398 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 399                                      bool (skip)(struct dso *dso, int parm), int parm)
 400 {
 401         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 402                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 403 }
 404
 405 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 406                                      bool (skip)(struct dso *dso, int parm), int parm)
 407 {
 408         struct rb_node *nd;
 409         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 410
 411         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 412                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 413                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 414         }
 415         return ret;
 416 }
 417
 418 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 419 {
 420         int i;
 421         size_t printed = 0;
 422         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 423
 424         if (kdso->has_build_id) {
 425                 char filename[PATH_MAX];
 426                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 427                         printed += fprintf(fp, "[0] %s\n", filename);
 428         }
 429
 430         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 431                 printed += fprintf(fp, "[%d] %s\n",
 432                                    i + kdso->has_build_id, vmlinux_path[i]);
 433
 434         return printed;
 435 }
 436
 437 size_t machine__fprintf(struct machine *machine, FILE *fp)
 438 {
 439         size_t ret = 0;
 440         struct rb_node *nd;
 441
 442         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 443                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 444
 445                 ret += thread__fprintf(pos, fp);
 446         }
 447
 448         return ret;
 449 }
 450
 451 static struct dso *machine__get_kernel(struct machine *machine)
 452 {
 453         const char *vmlinux_name = NULL;
 454         struct dso *kernel;
 455
 456         if (machine__is_host(machine)) {
 457                 vmlinux_name = symbol_conf.vmlinux_name;
 458                 if (!vmlinux_name)
 459                         vmlinux_name = "[kernel.kallsyms]";
 460
 461                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 462                                              "[kernel]",
 463                                              DSO_TYPE_KERNEL);
 464         } else {
 465                 char bf[PATH_MAX];
 466
 467                 if (machine__is_default_guest(machine))
 468                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 469                 if (!vmlinux_name)
 470                         vmlinux_name = machine__mmap_name(machine, bf,
 471                                                           sizeof(bf));
 472
 473                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 474                                              "[guest.kernel]",
 475                                              DSO_TYPE_GUEST_KERNEL);
 476         }
 477
 478         if (kernel != NULL && (!kernel->has_build_id))
 479                 dso__read_running_kernel_build_id(kernel, machine);
 480
 481         return kernel;
 482 }
 483
 484 struct process_args {
 485         u64 start;
 486 };
 487
 488 static int symbol__in_kernel(void *arg, const char *name,
 489                              char type __maybe_unused, u64 start)
 490 {
 491         struct process_args *args = arg;
 492
 493         if (strchr(name, '['))
 494                 return 0;
 495
 496         args->start = start;
 497         return 1;
 498 }
 499
 500 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 501                                            size_t bufsz)
 502 {
 503         if (machine__is_default_guest(machine))
 504                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 505         else
 506                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 507 }
 508
 509 /* Figure out the start address of kernel map from /proc/kallsyms */
 510 static u64 machine__get_kernel_start_addr(struct machine *machine)
 511 {
 512         char filename[PATH_MAX];
 513         struct process_args args;
 514
 515         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 516
 517         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 518                 return 0;
 519
 520         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
 521                 return 0;
 522
 523         return args.start;
 524 }
 525
 526 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 527 {
 528         enum map_type type;
 529         u64 start = machine__get_kernel_start_addr(machine);
 530
 531         for (type = 0; type < MAP__NR_TYPES; ++type) {
 532                 struct kmap *kmap;
 533
 534                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 535                 if (machine->vmlinux_maps[type] == NULL)
 536                         return -1;
 537
 538                 machine->vmlinux_maps[type]->map_ip =
 539                         machine->vmlinux_maps[type]->unmap_ip =
 540                                 identity__map_ip;
 541                 kmap = map__kmap(machine->vmlinux_maps[type]);
 542                 kmap->kmaps = &machine->kmaps;
 543                 map_groups__insert(&machine->kmaps,
 544                                    machine->vmlinux_maps[type]);
 545         }
 546
 547         return 0;
 548 }
 549
 550 void machine__destroy_kernel_maps(struct machine *machine)
 551 {
 552         enum map_type type;
 553
 554         for (type = 0; type < MAP__NR_TYPES; ++type) {
 555                 struct kmap *kmap;
 556
 557                 if (machine->vmlinux_maps[type] == NULL)
 558                         continue;
 559
 560                 kmap = map__kmap(machine->vmlinux_maps[type]);
 561                 map_groups__remove(&machine->kmaps,
 562                                    machine->vmlinux_maps[type]);
 563                 if (kmap->ref_reloc_sym) {
 564                         /*
 565                          * ref_reloc_sym is shared among all maps, so free just
 566                          * on one of them.
 567                          */
 568                         if (type == MAP__FUNCTION) {
 569                                 zfree((char **)&kmap->ref_reloc_sym->name);
 570                                 zfree(&kmap->ref_reloc_sym);
 571                         } else
 572                                 kmap->ref_reloc_sym = NULL;
 573                 }
 574
 575                 map__delete(machine->vmlinux_maps[type]);
 576                 machine->vmlinux_maps[type] = NULL;
 577         }
 578 }
 579
 580 int machines__create_guest_kernel_maps(struct machines *machines)
 581 {
 582         int ret = 0;
 583         struct dirent **namelist = NULL;
 584         int i, items = 0;
 585         char path[PATH_MAX];
 586         pid_t pid;
 587         char *endp;
 588
 589         if (symbol_conf.default_guest_vmlinux_name ||
 590             symbol_conf.default_guest_modules ||
 591             symbol_conf.default_guest_kallsyms) {
 592                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 593         }
 594
 595         if (symbol_conf.guestmount) {
 596                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 597                 if (items <= 0)
 598                         return -ENOENT;
 599                 for (i = 0; i < items; i++) {
 600                         if (!isdigit(namelist[i]->d_name[0])) {
 601                                 /* Filter out . and .. */
 602                                 continue;
 603                         }
 604                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 605                         if ((*endp != '\0') ||
 606                             (endp == namelist[i]->d_name) ||
 607                             (errno == ERANGE)) {
 608                                 pr_debug("invalid directory (%s). Skipping.\n",
 609                                          namelist[i]->d_name);
 610                                 continue;
 611                         }
 612                         sprintf(path, "%s/%s/proc/kallsyms",
 613                                 symbol_conf.guestmount,
 614                                 namelist[i]->d_name);
 615                         ret = access(path, R_OK);
 616                         if (ret) {
 617                                 pr_debug("Can't access file %s\n", path);
 618                                 goto failure;
 619                         }
 620                         machines__create_kernel_maps(machines, pid);
 621                 }
 622 failure:
 623                 free(namelist);
 624         }
 625
 626         return ret;
 627 }
 628
 629 void machines__destroy_kernel_maps(struct machines *machines)
 630 {
 631         struct rb_node *next = rb_first(&machines->guests);
 632
 633         machine__destroy_kernel_maps(&machines->host);
 634
 635         while (next) {
 636                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 637
 638                 next = rb_next(&pos->rb_node);
 639                 rb_erase(&pos->rb_node, &machines->guests);
 640                 machine__delete(pos);
 641         }
 642 }
 643
 644 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 645 {
 646         struct machine *machine = machines__findnew(machines, pid);
 647
 648         if (machine == NULL)
 649                 return -1;
 650
 651         return machine__create_kernel_maps(machine);
 652 }
 653
 654 int machine__load_kallsyms(struct machine *machine, const char *filename,
 655                            enum map_type type, symbol_filter_t filter)
 656 {
 657         struct map *map = machine->vmlinux_maps[type];
 658         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 659
 660         if (ret > 0) {
 661                 dso__set_loaded(map->dso, type);
 662                 /*
 663                  * Since /proc/kallsyms will have multiple sessions for the
 664                  * kernel, with modules between them, fixup the end of all
 665                  * sections.
 666                  */
 667                 __map_groups__fixup_end(&machine->kmaps, type);
 668         }
 669
 670         return ret;
 671 }
 672
 673 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 674                                symbol_filter_t filter)
 675 {
 676         struct map *map = machine->vmlinux_maps[type];
 677         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 678
 679         if (ret > 0)
 680                 dso__set_loaded(map->dso, type);
 681
 682         return ret;
 683 }
 684
 685 static void map_groups__fixup_end(struct map_groups *mg)
 686 {
 687         int i;
 688         for (i = 0; i < MAP__NR_TYPES; ++i)
 689                 __map_groups__fixup_end(mg, i);
 690 }
 691
 692 static char *get_kernel_version(const char *root_dir)
 693 {
 694         char version[PATH_MAX];
 695         FILE *file;
 696         char *name, *tmp;
 697         const char *prefix = "Linux version ";
 698
 699         sprintf(version, "%s/proc/version", root_dir);
 700         file = fopen(version, "r");
 701         if (!file)
 702                 return NULL;
 703
 704         version[0] = '\0';
 705         tmp = fgets(version, sizeof(version), file);
 706         fclose(file);
 707
 708         name = strstr(version, prefix);
 709         if (!name)
 710                 return NULL;
 711         name += strlen(prefix);
 712         tmp = strchr(name, ' ');
 713         if (tmp)
 714                 *tmp = '\0';
 715
 716         return strdup(name);
 717 }
 718
 719 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 720                                 const char *dir_name, int depth)
 721 {
 722         struct dirent *dent;
 723         DIR *dir = opendir(dir_name);
 724         int ret = 0;
 725
 726         if (!dir) {
 727                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 728                 return -1;
 729         }
 730
 731         while ((dent = readdir(dir)) != NULL) {
 732                 char path[PATH_MAX];
 733                 struct stat st;
 734
 735                 /*sshfs might return bad dent->d_type, so we have to stat*/
 736                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 737                 if (stat(path, &st))
 738                         continue;
 739
 740                 if (S_ISDIR(st.st_mode)) {
 741                         if (!strcmp(dent->d_name, ".") ||
 742                             !strcmp(dent->d_name, ".."))
 743                                 continue;
 744
 745                         /* Do not follow top-level source and build symlinks */
 746                         if (depth == 0) {
 747                                 if (!strcmp(dent->d_name, "source") ||
 748                                     !strcmp(dent->d_name, "build"))
 749                                         continue;
 750                         }
 751
 752                         ret = map_groups__set_modules_path_dir(mg, path,
 753                                                                depth + 1);
 754                         if (ret < 0)
 755                                 goto out;
 756                 } else {
 757                         char *dot = strrchr(dent->d_name, '.'),
 758                              dso_name[PATH_MAX];
 759                         struct map *map;
 760                         char *long_name;
 761
 762                         if (dot == NULL || strcmp(dot, ".ko"))
 763                                 continue;
 764                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 765                                  (int)(dot - dent->d_name), dent->d_name);
 766
 767                         strxfrchar(dso_name, '-', '_');
 768                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 769                                                        dso_name);
 770                         if (map == NULL)
 771                                 continue;
 772
 773                         long_name = strdup(path);
 774                         if (long_name == NULL) {
 775                                 ret = -1;
 776                                 goto out;
 777                         }
 778                         dso__set_long_name(map->dso, long_name, true);
 779                         dso__kernel_module_get_build_id(map->dso, "");
 780                 }
 781         }
 782
 783 out:
 784         closedir(dir);
 785         return ret;
 786 }
 787
 788 static int machine__set_modules_path(struct machine *machine)
 789 {
 790         char *version;
 791         char modules_path[PATH_MAX];
 792
 793         version = get_kernel_version(machine->root_dir);
 794         if (!version)
 795                 return -1;
 796
 797         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
 798                  machine->root_dir, version);
 799         free(version);
 800
 801         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
 802 }
 803
 804 static int machine__create_module(void *arg, const char *name, u64 start)
 805 {
 806         struct machine *machine = arg;
 807         struct map *map;
 808
 809         map = machine__new_module(machine, start, name);
 810         if (map == NULL)
 811                 return -1;
 812
 813         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 814
 815         return 0;
 816 }
 817
 818 static int machine__create_modules(struct machine *machine)
 819 {
 820         const char *modules;
 821         char path[PATH_MAX];
 822
 823         if (machine__is_default_guest(machine)) {
 824                 modules = symbol_conf.default_guest_modules;
 825         } else {
 826                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 827                 modules = path;
 828         }
 829
 830         if (symbol__restricted_filename(modules, "/proc/modules"))
 831                 return -1;
 832
 833         if (modules__parse(modules, machine, machine__create_module))
 834                 return -1;
 835
 836         if (!machine__set_modules_path(machine))
 837                 return 0;
 838
 839         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 840
 841         return 0;
 842 }
 843
 844 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 845
 846 int machine__create_kernel_maps(struct machine *machine)
 847 {
 848         struct dso *kernel = machine__get_kernel(machine);
 849         char filename[PATH_MAX];
 850         const char *name;
 851         u64 addr = 0;
 852         int i;
 853
 854         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 855
 856         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 857                 addr = kallsyms__get_function_start(filename, name);
 858                 if (addr)
 859                         break;
 860         }
 861         if (!addr)
 862                 return -1;
 863
 864         if (kernel == NULL ||
 865             __machine__create_kernel_maps(machine, kernel) < 0)
 866                 return -1;
 867
 868         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 869                 if (machine__is_host(machine))
 870                         pr_debug("Problems creating module maps, "
 871                                  "continuing anyway...\n");
 872                 else
 873                         pr_debug("Problems creating module maps for guest %d, "
 874                                  "continuing anyway...\n", machine->pid);
 875         }
 876
 877         /*
 878          * Now that we have all the maps created, just set the ->end of them:
 879          */
 880         map_groups__fixup_end(&machine->kmaps);
 881
 882         if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
 883                                              addr)) {
 884                 machine__destroy_kernel_maps(machine);
 885                 return -1;
 886         }
 887
 888         return 0;
 889 }
 890
 891 static void machine__set_kernel_mmap_len(struct machine *machine,
 892                                          union perf_event *event)
 893 {
 894         int i;
 895
 896         for (i = 0; i < MAP__NR_TYPES; i++) {
 897                 machine->vmlinux_maps[i]->start = event->mmap.start;
 898                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 899                                                    event->mmap.len);
 900                 /*
 901                  * Be a bit paranoid here, some perf.data file came with
 902                  * a zero sized synthesized MMAP event for the kernel.
 903                  */
 904                 if (machine->vmlinux_maps[i]->end == 0)
 905                         machine->vmlinux_maps[i]->end = ~0ULL;
 906         }
 907 }
 908
 909 static bool machine__uses_kcore(struct machine *machine)
 910 {
 911         struct dso *dso;
 912
 913         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 914                 if (dso__is_kcore(dso))
 915                         return true;
 916         }
 917
 918         return false;
 919 }
 920
 921 static int machine__process_kernel_mmap_event(struct machine *machine,
 922                                               union perf_event *event)
 923 {
 924         struct map *map;
 925         char kmmap_prefix[PATH_MAX];
 926         enum dso_kernel_type kernel_type;
 927         bool is_kernel_mmap;
 928
 929         /* If we have maps from kcore then we do not need or want any others */
 930         if (machine__uses_kcore(machine))
 931                 return 0;
 932
 933         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 934         if (machine__is_host(machine))
 935                 kernel_type = DSO_TYPE_KERNEL;
 936         else
 937                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 938
 939         is_kernel_mmap = memcmp(event->mmap.filename,
 940                                 kmmap_prefix,
 941                                 strlen(kmmap_prefix) - 1) == 0;
 942         if (event->mmap.filename[0] == '/' ||
 943             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 944
 945                 char short_module_name[1024];
 946                 char *name, *dot;
 947
 948                 if (event->mmap.filename[0] == '/') {
 949                         name = strrchr(event->mmap.filename, '/');
 950                         if (name == NULL)
 951                                 goto out_problem;
 952
 953                         ++name; /* skip / */
 954                         dot = strrchr(name, '.');
 955                         if (dot == NULL)
 956                                 goto out_problem;
 957                         snprintf(short_module_name, sizeof(short_module_name),
 958                                         "[%.*s]", (int)(dot - name), name);
 959                         strxfrchar(short_module_name, '-', '_');
 960                 } else
 961                         strcpy(short_module_name, event->mmap.filename);
 962
 963                 map = machine__new_module(machine, event->mmap.start,
 964                                           event->mmap.filename);
 965                 if (map == NULL)
 966                         goto out_problem;
 967
 968                 name = strdup(short_module_name);
 969                 if (name == NULL)
 970                         goto out_problem;
 971
 972                 dso__set_short_name(map->dso, name, true);
 973                 map->end = map->start + event->mmap.len;
 974         } else if (is_kernel_mmap) {
 975                 const char *symbol_name = (event->mmap.filename +
 976                                 strlen(kmmap_prefix));
 977                 /*
 978                  * Should be there already, from the build-id table in
 979                  * the header.
 980                  */
 981                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 982                                                      kmmap_prefix);
 983                 if (kernel == NULL)
 984                         goto out_problem;
 985
 986                 kernel->kernel = kernel_type;
 987                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 988                         goto out_problem;
 989
 990                 machine__set_kernel_mmap_len(machine, event);
 991
 992                 /*
 993                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 994                  * symbol. Effectively having zero here means that at record
 995                  * time /proc/sys/kernel/kptr_restrict was non zero.
 996                  */
 997                 if (event->mmap.pgoff != 0) {
 998                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 999                                                          symbol_name,
1000                                                          event->mmap.pgoff);
1001                 }
1002
1003                 if (machine__is_default_guest(machine)) {
1004                         /*
1005                          * preload dso of guest kernel and modules
1006                          */
1007                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1008                                   NULL);
1009                 }
1010         }
1011         return 0;
1012 out_problem:
1013         return -1;
1014 }
1015
1016 int machine__process_mmap2_event(struct machine *machine,
1017                                  union perf_event *event,
1018                                  struct perf_sample *sample __maybe_unused)
1019 {
1020         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1021         struct thread *thread;
1022         struct map *map;
1023         enum map_type type;
1024         int ret = 0;
1025
1026         if (dump_trace)
1027                 perf_event__fprintf_mmap2(event, stdout);
1028
1029         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1030             cpumode == PERF_RECORD_MISC_KERNEL) {
1031                 ret = machine__process_kernel_mmap_event(machine, event);
1032                 if (ret < 0)
1033                         goto out_problem;
1034                 return 0;
1035         }
1036
1037         thread = machine__findnew_thread(machine, event->mmap2.pid,
1038                                         event->mmap2.tid);
1039         if (thread == NULL)
1040                 goto out_problem;
1041
1042         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1043                 type = MAP__VARIABLE;
1044         else
1045                 type = MAP__FUNCTION;
1046
1047         map = map__new(&machine->user_dsos, event->mmap2.start,
1048                         event->mmap2.len, event->mmap2.pgoff,
1049                         event->mmap2.pid, event->mmap2.maj,
1050                         event->mmap2.min, event->mmap2.ino,
1051                         event->mmap2.ino_generation,
1052                         event->mmap2.filename, type);
1053
1054         if (map == NULL)
1055                 goto out_problem;
1056
1057         thread__insert_map(thread, map);
1058         return 0;
1059
1060 out_problem:
1061         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1062         return 0;
1063 }
1064
1065 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1066                                 struct perf_sample *sample __maybe_unused)
1067 {
1068         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1069         struct thread *thread;
1070         struct map *map;
1071         enum map_type type;
1072         int ret = 0;
1073
1074         if (dump_trace)
1075                 perf_event__fprintf_mmap(event, stdout);
1076
1077         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1078             cpumode == PERF_RECORD_MISC_KERNEL) {
1079                 ret = machine__process_kernel_mmap_event(machine, event);
1080                 if (ret < 0)
1081                         goto out_problem;
1082                 return 0;
1083         }
1084
1085         thread = machine__findnew_thread(machine, event->mmap.pid,
1086                                          event->mmap.tid);
1087         if (thread == NULL)
1088                 goto out_problem;
1089
1090         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1091                 type = MAP__VARIABLE;
1092         else
1093                 type = MAP__FUNCTION;
1094
1095         map = map__new(&machine->user_dsos, event->mmap.start,
1096                         event->mmap.len, event->mmap.pgoff,
1097                         event->mmap.pid, 0, 0, 0, 0,
1098                         event->mmap.filename,
1099                         type);
1100
1101         if (map == NULL)
1102                 goto out_problem;
1103
1104         thread__insert_map(thread, map);
1105         return 0;
1106
1107 out_problem:
1108         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1109         return 0;
1110 }
1111
1112 static void machine__remove_thread(struct machine *machine, struct thread *th)
1113 {
1114         machine->last_match = NULL;
1115         rb_erase(&th->rb_node, &machine->threads);
1116         /*
1117          * We may have references to this thread, for instance in some hist_entry
1118          * instances, so just move them to a separate list.
1119          */
1120         list_add_tail(&th->node, &machine->dead_threads);
1121 }
1122
1123 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1124                                 struct perf_sample *sample)
1125 {
1126         struct thread *thread = machine__find_thread(machine,
1127                                                      event->fork.pid,
1128                                                      event->fork.tid);
1129         struct thread *parent = machine__findnew_thread(machine,
1130                                                         event->fork.ppid,
1131                                                         event->fork.ptid);
1132
1133         /* if a thread currently exists for the thread id remove it */
1134         if (thread != NULL)
1135                 machine__remove_thread(machine, thread);
1136
1137         thread = machine__findnew_thread(machine, event->fork.pid,
1138                                          event->fork.tid);
1139         if (dump_trace)
1140                 perf_event__fprintf_task(event, stdout);
1141
1142         if (thread == NULL || parent == NULL ||
1143             thread__fork(thread, parent, sample->time) < 0) {
1144                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1145                 return -1;
1146         }
1147
1148         return 0;
1149 }
1150
1151 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1152                                 struct perf_sample *sample __maybe_unused)
1153 {
1154         struct thread *thread = machine__find_thread(machine,
1155                                                      event->fork.pid,
1156                                                      event->fork.tid);
1157
1158         if (dump_trace)
1159                 perf_event__fprintf_task(event, stdout);
1160
1161         if (thread != NULL)
1162                 thread__exited(thread);
1163
1164         return 0;
1165 }
1166
1167 int machine__process_event(struct machine *machine, union perf_event *event,
1168                            struct perf_sample *sample)
1169 {
1170         int ret;
1171
1172         switch (event->header.type) {
1173         case PERF_RECORD_COMM:
1174                 ret = machine__process_comm_event(machine, event, sample); break;
1175         case PERF_RECORD_MMAP:
1176                 ret = machine__process_mmap_event(machine, event, sample); break;
1177         case PERF_RECORD_MMAP2:
1178                 ret = machine__process_mmap2_event(machine, event, sample); break;
1179         case PERF_RECORD_FORK:
1180                 ret = machine__process_fork_event(machine, event, sample); break;
1181         case PERF_RECORD_EXIT:
1182                 ret = machine__process_exit_event(machine, event, sample); break;
1183         case PERF_RECORD_LOST:
1184                 ret = machine__process_lost_event(machine, event, sample); break;
1185         default:
1186                 ret = -1;
1187                 break;
1188         }
1189
1190         return ret;
1191 }
1192
1193 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1194 {
1195         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1196                 return 1;
1197         return 0;
1198 }
1199
1200 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1201                             struct addr_map_symbol *ams,
1202                             u64 ip)
1203 {
1204         struct addr_location al;
1205
1206         memset(&al, 0, sizeof(al));
1207         /*
1208          * We cannot use the header.misc hint to determine whether a
1209          * branch stack address is user, kernel, guest, hypervisor.
1210          * Branches may straddle the kernel/user/hypervisor boundaries.
1211          * Thus, we have to try consecutively until we find a match
1212          * or else, the symbol is unknown
1213          */
1214         thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1215
1216         ams->addr = ip;
1217         ams->al_addr = al.addr;
1218         ams->sym = al.sym;
1219         ams->map = al.map;
1220 }
1221
1222 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1223                              u8 m, struct addr_map_symbol *ams, u64 addr)
1224 {
1225         struct addr_location al;
1226
1227         memset(&al, 0, sizeof(al));
1228
1229         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1230                                    &al);
1231         ams->addr = addr;
1232         ams->al_addr = al.addr;
1233         ams->sym = al.sym;
1234         ams->map = al.map;
1235 }
1236
1237 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1238                                      struct addr_location *al)
1239 {
1240         struct mem_info *mi = zalloc(sizeof(*mi));
1241
1242         if (!mi)
1243                 return NULL;
1244
1245         ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1246         ip__resolve_data(al->machine, al->thread, al->cpumode,
1247                          &mi->daddr, sample->addr);
1248         mi->data_src.val = sample->data_src;
1249
1250         return mi;
1251 }
1252
1253 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1254                                            struct addr_location *al)
1255 {
1256         unsigned int i;
1257         const struct branch_stack *bs = sample->branch_stack;
1258         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1259
1260         if (!bi)
1261                 return NULL;
1262
1263         for (i = 0; i < bs->nr; i++) {
1264                 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1265                 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1266                 bi[i].flags = bs->entries[i].flags;
1267         }
1268         return bi;
1269 }
1270
1271 static int machine__resolve_callchain_sample(struct machine *machine,
1272                                              struct thread *thread,
1273                                              struct ip_callchain *chain,
1274                                              struct symbol **parent,
1275                                              struct addr_location *root_al,
1276                                              int max_stack)
1277 {
1278         u8 cpumode = PERF_RECORD_MISC_USER;
1279         int chain_nr = min(max_stack, (int)chain->nr);
1280         int i;
1281         int err;
1282
1283         callchain_cursor_reset(&callchain_cursor);
1284
1285         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1286                 pr_warning("corrupted callchain. skipping...\n");
1287                 return 0;
1288         }
1289
1290         for (i = 0; i < chain_nr; i++) {
1291                 u64 ip;
1292                 struct addr_location al;
1293
1294                 if (callchain_param.order == ORDER_CALLEE)
1295                         ip = chain->ips[i];
1296                 else
1297                         ip = chain->ips[chain->nr - i - 1];
1298
1299                 if (ip >= PERF_CONTEXT_MAX) {
1300                         switch (ip) {
1301                         case PERF_CONTEXT_HV:
1302                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1303                                 break;
1304                         case PERF_CONTEXT_KERNEL:
1305                                 cpumode = PERF_RECORD_MISC_KERNEL;
1306                                 break;
1307                         case PERF_CONTEXT_USER:
1308                                 cpumode = PERF_RECORD_MISC_USER;
1309                                 break;
1310                         default:
1311                                 pr_debug("invalid callchain context: "
1312                                          "%"PRId64"\n", (s64) ip);
1313                                 /*
1314                                  * It seems the callchain is corrupted.
1315                                  * Discard all.
1316                                  */
1317                                 callchain_cursor_reset(&callchain_cursor);
1318                                 return 0;
1319                         }
1320                         continue;
1321                 }
1322
1323                 al.filtered = 0;
1324                 thread__find_addr_location(thread, machine, cpumode,
1325                                            MAP__FUNCTION, ip, &al);
1326                 if (al.sym != NULL) {
1327                         if (sort__has_parent && !*parent &&
1328                             symbol__match_regex(al.sym, &parent_regex))
1329                                 *parent = al.sym;
1330                         else if (have_ignore_callees && root_al &&
1331                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1332                                 /* Treat this symbol as the root,
1333                                    forgetting its callees. */
1334                                 *root_al = al;
1335                                 callchain_cursor_reset(&callchain_cursor);
1336                         }
1337                 }
1338
1339                 err = callchain_cursor_append(&callchain_cursor,
1340                                               ip, al.map, al.sym);
1341                 if (err)
1342                         return err;
1343         }
1344
1345         return 0;
1346 }
1347
1348 static int unwind_entry(struct unwind_entry *entry, void *arg)
1349 {
1350         struct callchain_cursor *cursor = arg;
1351         return callchain_cursor_append(cursor, entry->ip,
1352                                        entry->map, entry->sym);
1353 }
1354
1355 int machine__resolve_callchain(struct machine *machine,
1356                                struct perf_evsel *evsel,
1357                                struct thread *thread,
1358                                struct perf_sample *sample,
1359                                struct symbol **parent,
1360                                struct addr_location *root_al,
1361                                int max_stack)
1362 {
1363         int ret;
1364
1365         ret = machine__resolve_callchain_sample(machine, thread,
1366                                                 sample->callchain, parent,
1367                                                 root_al, max_stack);
1368         if (ret)
1369                 return ret;
1370
1371         /* Can we do dwarf post unwind? */
1372         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1373               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1374                 return 0;
1375
1376         /* Bail out if nothing was captured. */
1377         if ((!sample->user_regs.regs) ||
1378             (!sample->user_stack.size))
1379                 return 0;
1380
1381         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1382                                    thread, sample, max_stack);
1383
1384 }
1385
1386 int machine__for_each_thread(struct machine *machine,
1387                              int (*fn)(struct thread *thread, void *p),
1388                              void *priv)
1389 {
1390         struct rb_node *nd;
1391         struct thread *thread;
1392         int rc = 0;
1393
1394         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1395                 thread = rb_entry(nd, struct thread, rb_node);
1396                 rc = fn(thread, priv);
1397                 if (rc != 0)
1398                         return rc;
1399         }
1400
1401         list_for_each_entry(thread, &machine->dead_threads, node) {
1402                 rc = fn(thread, priv);
1403                 if (rc != 0)
1404                         return rc;
1405         }
1406         return rc;
1407 }
1408
1409 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1410                                   struct target *target, struct thread_map *threads,
1411                                   perf_event__handler_t process, bool data_mmap)
1412 {
1413         if (target__has_task(target))
1414                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1415         else if (target__has_cpu(target))
1416                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1417         /* command specified */
1418         return 0;
1419 }