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, -1,
  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         machine->current_tid = NULL;
  49
  50         return 0;
  51 }
  52
  53 struct machine *machine__new_host(void)
  54 {
  55         struct machine *machine = malloc(sizeof(*machine));
  56
  57         if (machine != NULL) {
  58                 machine__init(machine, "", HOST_KERNEL_ID);
  59
  60                 if (machine__create_kernel_maps(machine) < 0)
  61                         goto out_delete;
  62         }
  63
  64         return machine;
  65 out_delete:
  66         free(machine);
  67         return NULL;
  68 }
  69
  70 static void dsos__delete(struct list_head *dsos)
  71 {
  72         struct dso *pos, *n;
  73
  74         list_for_each_entry_safe(pos, n, dsos, node) {
  75                 list_del(&pos->node);
  76                 dso__delete(pos);
  77         }
  78 }
  79
  80 void machine__delete_dead_threads(struct machine *machine)
  81 {
  82         struct thread *n, *t;
  83
  84         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
  85                 list_del(&t->node);
  86                 thread__delete(t);
  87         }
  88 }
  89
  90 void machine__delete_threads(struct machine *machine)
  91 {
  92         struct rb_node *nd = rb_first(&machine->threads);
  93
  94         while (nd) {
  95                 struct thread *t = rb_entry(nd, struct thread, rb_node);
  96
  97                 rb_erase(&t->rb_node, &machine->threads);
  98                 nd = rb_next(nd);
  99                 thread__delete(t);
 100         }
 101 }
 102
 103 void machine__exit(struct machine *machine)
 104 {
 105         map_groups__exit(&machine->kmaps);
 106         dsos__delete(&machine->user_dsos);
 107         dsos__delete(&machine->kernel_dsos);
 108         zfree(&machine->root_dir);
 109         zfree(&machine->current_tid);
 110 }
 111
 112 void machine__delete(struct machine *machine)
 113 {
 114         machine__exit(machine);
 115         free(machine);
 116 }
 117
 118 void machines__init(struct machines *machines)
 119 {
 120         machine__init(&machines->host, "", HOST_KERNEL_ID);
 121         machines->guests = RB_ROOT;
 122         machines->symbol_filter = NULL;
 123 }
 124
 125 void machines__exit(struct machines *machines)
 126 {
 127         machine__exit(&machines->host);
 128         /* XXX exit guest */
 129 }
 130
 131 struct machine *machines__add(struct machines *machines, pid_t pid,
 132                               const char *root_dir)
 133 {
 134         struct rb_node **p = &machines->guests.rb_node;
 135         struct rb_node *parent = NULL;
 136         struct machine *pos, *machine = malloc(sizeof(*machine));
 137
 138         if (machine == NULL)
 139                 return NULL;
 140
 141         if (machine__init(machine, root_dir, pid) != 0) {
 142                 free(machine);
 143                 return NULL;
 144         }
 145
 146         machine->symbol_filter = machines->symbol_filter;
 147
 148         while (*p != NULL) {
 149                 parent = *p;
 150                 pos = rb_entry(parent, struct machine, rb_node);
 151                 if (pid < pos->pid)
 152                         p = &(*p)->rb_left;
 153                 else
 154                         p = &(*p)->rb_right;
 155         }
 156
 157         rb_link_node(&machine->rb_node, parent, p);
 158         rb_insert_color(&machine->rb_node, &machines->guests);
 159
 160         return machine;
 161 }
 162
 163 void machines__set_symbol_filter(struct machines *machines,
 164                                  symbol_filter_t symbol_filter)
 165 {
 166         struct rb_node *nd;
 167
 168         machines->symbol_filter = symbol_filter;
 169         machines->host.symbol_filter = symbol_filter;
 170
 171         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 172                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
 173
 174                 machine->symbol_filter = symbol_filter;
 175         }
 176 }
 177
 178 struct machine *machines__find(struct machines *machines, pid_t pid)
 179 {
 180         struct rb_node **p = &machines->guests.rb_node;
 181         struct rb_node *parent = NULL;
 182         struct machine *machine;
 183         struct machine *default_machine = NULL;
 184
 185         if (pid == HOST_KERNEL_ID)
 186                 return &machines->host;
 187
 188         while (*p != NULL) {
 189                 parent = *p;
 190                 machine = rb_entry(parent, struct machine, rb_node);
 191                 if (pid < machine->pid)
 192                         p = &(*p)->rb_left;
 193                 else if (pid > machine->pid)
 194                         p = &(*p)->rb_right;
 195                 else
 196                         return machine;
 197                 if (!machine->pid)
 198                         default_machine = machine;
 199         }
 200
 201         return default_machine;
 202 }
 203
 204 struct machine *machines__findnew(struct machines *machines, pid_t pid)
 205 {
 206         char path[PATH_MAX];
 207         const char *root_dir = "";
 208         struct machine *machine = machines__find(machines, pid);
 209
 210         if (machine && (machine->pid == pid))
 211                 goto out;
 212
 213         if ((pid != HOST_KERNEL_ID) &&
 214             (pid != DEFAULT_GUEST_KERNEL_ID) &&
 215             (symbol_conf.guestmount)) {
 216                 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 217                 if (access(path, R_OK)) {
 218                         static struct strlist *seen;
 219
 220                         if (!seen)
 221                                 seen = strlist__new(true, NULL);
 222
 223                         if (!strlist__has_entry(seen, path)) {
 224                                 pr_err("Can't access file %s\n", path);
 225                                 strlist__add(seen, path);
 226                         }
 227                         machine = NULL;
 228                         goto out;
 229                 }
 230                 root_dir = path;
 231         }
 232
 233         machine = machines__add(machines, pid, root_dir);
 234 out:
 235         return machine;
 236 }
 237
 238 void machines__process_guests(struct machines *machines,
 239                               machine__process_t process, void *data)
 240 {
 241         struct rb_node *nd;
 242
 243         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 244                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 245                 process(pos, data);
 246         }
 247 }
 248
 249 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 250 {
 251         if (machine__is_host(machine))
 252                 snprintf(bf, size, "[%s]", "kernel.kallsyms");
 253         else if (machine__is_default_guest(machine))
 254                 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 255         else {
 256                 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
 257                          machine->pid);
 258         }
 259
 260         return bf;
 261 }
 262
 263 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 264 {
 265         struct rb_node *node;
 266         struct machine *machine;
 267
 268         machines->host.id_hdr_size = id_hdr_size;
 269
 270         for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 271                 machine = rb_entry(node, struct machine, rb_node);
 272                 machine->id_hdr_size = id_hdr_size;
 273         }
 274
 275         return;
 276 }
 277
 278 static void machine__update_thread_pid(struct machine *machine,
 279                                        struct thread *th, pid_t pid)
 280 {
 281         struct thread *leader;
 282
 283         if (pid == th->pid_ || pid == -1 || th->pid_ != -1)
 284                 return;
 285
 286         th->pid_ = pid;
 287
 288         if (th->pid_ == th->tid)
 289                 return;
 290
 291         leader = machine__findnew_thread(machine, th->pid_, th->pid_);
 292         if (!leader)
 293                 goto out_err;
 294
 295         if (!leader->mg)
 296                 leader->mg = map_groups__new();
 297
 298         if (!leader->mg)
 299                 goto out_err;
 300
 301         if (th->mg == leader->mg)
 302                 return;
 303
 304         if (th->mg) {
 305                 /*
 306                  * Maps are created from MMAP events which provide the pid and
 307                  * tid.  Consequently there never should be any maps on a thread
 308                  * with an unknown pid.  Just print an error if there are.
 309                  */
 310                 if (!map_groups__empty(th->mg))
 311                         pr_err("Discarding thread maps for %d:%d\n",
 312                                th->pid_, th->tid);
 313                 map_groups__delete(th->mg);
 314         }
 315
 316         th->mg = map_groups__get(leader->mg);
 317
 318         return;
 319
 320 out_err:
 321         pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
 322 }
 323
 324 static struct thread *__machine__findnew_thread(struct machine *machine,
 325                                                 pid_t pid, pid_t tid,
 326                                                 bool create)
 327 {
 328         struct rb_node **p = &machine->threads.rb_node;
 329         struct rb_node *parent = NULL;
 330         struct thread *th;
 331
 332         /*
 333          * Front-end cache - TID lookups come in blocks,
 334          * so most of the time we dont have to look up
 335          * the full rbtree:
 336          */
 337         th = machine->last_match;
 338         if (th && th->tid == tid) {
 339                 machine__update_thread_pid(machine, th, pid);
 340                 return th;
 341         }
 342
 343         while (*p != NULL) {
 344                 parent = *p;
 345                 th = rb_entry(parent, struct thread, rb_node);
 346
 347                 if (th->tid == tid) {
 348                         machine->last_match = th;
 349                         machine__update_thread_pid(machine, th, pid);
 350                         return th;
 351                 }
 352
 353                 if (tid < th->tid)
 354                         p = &(*p)->rb_left;
 355                 else
 356                         p = &(*p)->rb_right;
 357         }
 358
 359         if (!create)
 360                 return NULL;
 361
 362         th = thread__new(pid, tid);
 363         if (th != NULL) {
 364                 rb_link_node(&th->rb_node, parent, p);
 365                 rb_insert_color(&th->rb_node, &machine->threads);
 366                 machine->last_match = th;
 367
 368                 /*
 369                  * We have to initialize map_groups separately
 370                  * after rb tree is updated.
 371                  *
 372                  * The reason is that we call machine__findnew_thread
 373                  * within thread__init_map_groups to find the thread
 374                  * leader and that would screwed the rb tree.
 375                  */
 376                 if (thread__init_map_groups(th, machine)) {
 377                         thread__delete(th);
 378                         return NULL;
 379                 }
 380         }
 381
 382         return th;
 383 }
 384
 385 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
 386                                        pid_t tid)
 387 {
 388         return __machine__findnew_thread(machine, pid, tid, true);
 389 }
 390
 391 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
 392                                     pid_t tid)
 393 {
 394         return __machine__findnew_thread(machine, pid, tid, false);
 395 }
 396
 397 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 398                                 struct perf_sample *sample)
 399 {
 400         struct thread *thread = machine__findnew_thread(machine,
 401                                                         event->comm.pid,
 402                                                         event->comm.tid);
 403
 404         if (dump_trace)
 405                 perf_event__fprintf_comm(event, stdout);
 406
 407         if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
 408                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 409                 return -1;
 410         }
 411
 412         return 0;
 413 }
 414
 415 int machine__process_lost_event(struct machine *machine __maybe_unused,
 416                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 417 {
 418         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 419                     event->lost.id, event->lost.lost);
 420         return 0;
 421 }
 422
 423 struct map *machine__new_module(struct machine *machine, u64 start,
 424                                 const char *filename)
 425 {
 426         struct map *map;
 427         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 428
 429         if (dso == NULL)
 430                 return NULL;
 431
 432         map = map__new2(start, dso, MAP__FUNCTION);
 433         if (map == NULL)
 434                 return NULL;
 435
 436         if (machine__is_host(machine))
 437                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 438         else
 439                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 440         map_groups__insert(&machine->kmaps, map);
 441         return map;
 442 }
 443
 444 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 445 {
 446         struct rb_node *nd;
 447         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 448                      __dsos__fprintf(&machines->host.user_dsos, fp);
 449
 450         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 451                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 452                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 453                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 454         }
 455
 456         return ret;
 457 }
 458
 459 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 460                                      bool (skip)(struct dso *dso, int parm), int parm)
 461 {
 462         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 463                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 464 }
 465
 466 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 467                                      bool (skip)(struct dso *dso, int parm), int parm)
 468 {
 469         struct rb_node *nd;
 470         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 471
 472         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 473                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 474                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 475         }
 476         return ret;
 477 }
 478
 479 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 480 {
 481         int i;
 482         size_t printed = 0;
 483         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 484
 485         if (kdso->has_build_id) {
 486                 char filename[PATH_MAX];
 487                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 488                         printed += fprintf(fp, "[0] %s\n", filename);
 489         }
 490
 491         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 492                 printed += fprintf(fp, "[%d] %s\n",
 493                                    i + kdso->has_build_id, vmlinux_path[i]);
 494
 495         return printed;
 496 }
 497
 498 size_t machine__fprintf(struct machine *machine, FILE *fp)
 499 {
 500         size_t ret = 0;
 501         struct rb_node *nd;
 502
 503         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 504                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 505
 506                 ret += thread__fprintf(pos, fp);
 507         }
 508
 509         return ret;
 510 }
 511
 512 static struct dso *machine__get_kernel(struct machine *machine)
 513 {
 514         const char *vmlinux_name = NULL;
 515         struct dso *kernel;
 516
 517         if (machine__is_host(machine)) {
 518                 vmlinux_name = symbol_conf.vmlinux_name;
 519                 if (!vmlinux_name)
 520                         vmlinux_name = "[kernel.kallsyms]";
 521
 522                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 523                                              "[kernel]",
 524                                              DSO_TYPE_KERNEL);
 525         } else {
 526                 char bf[PATH_MAX];
 527
 528                 if (machine__is_default_guest(machine))
 529                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 530                 if (!vmlinux_name)
 531                         vmlinux_name = machine__mmap_name(machine, bf,
 532                                                           sizeof(bf));
 533
 534                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 535                                              "[guest.kernel]",
 536                                              DSO_TYPE_GUEST_KERNEL);
 537         }
 538
 539         if (kernel != NULL && (!kernel->has_build_id))
 540                 dso__read_running_kernel_build_id(kernel, machine);
 541
 542         return kernel;
 543 }
 544
 545 struct process_args {
 546         u64 start;
 547 };
 548
 549 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 550                                            size_t bufsz)
 551 {
 552         if (machine__is_default_guest(machine))
 553                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 554         else
 555                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 556 }
 557
 558 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 559
 560 /* Figure out the start address of kernel map from /proc/kallsyms.
 561  * Returns the name of the start symbol in *symbol_name. Pass in NULL as
 562  * symbol_name if it's not that important.
 563  */
 564 static u64 machine__get_kernel_start_addr(struct machine *machine,
 565                                           const char **symbol_name)
 566 {
 567         char filename[PATH_MAX];
 568         int i;
 569         const char *name;
 570         u64 addr = 0;
 571
 572         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 573
 574         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 575                 return 0;
 576
 577         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 578                 addr = kallsyms__get_function_start(filename, name);
 579                 if (addr)
 580                         break;
 581         }
 582
 583         if (symbol_name)
 584                 *symbol_name = name;
 585
 586         return addr;
 587 }
 588
 589 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 590 {
 591         enum map_type type;
 592         u64 start = machine__get_kernel_start_addr(machine, NULL);
 593
 594         for (type = 0; type < MAP__NR_TYPES; ++type) {
 595                 struct kmap *kmap;
 596
 597                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 598                 if (machine->vmlinux_maps[type] == NULL)
 599                         return -1;
 600
 601                 machine->vmlinux_maps[type]->map_ip =
 602                         machine->vmlinux_maps[type]->unmap_ip =
 603                                 identity__map_ip;
 604                 kmap = map__kmap(machine->vmlinux_maps[type]);
 605                 kmap->kmaps = &machine->kmaps;
 606                 map_groups__insert(&machine->kmaps,
 607                                    machine->vmlinux_maps[type]);
 608         }
 609
 610         return 0;
 611 }
 612
 613 void machine__destroy_kernel_maps(struct machine *machine)
 614 {
 615         enum map_type type;
 616
 617         for (type = 0; type < MAP__NR_TYPES; ++type) {
 618                 struct kmap *kmap;
 619
 620                 if (machine->vmlinux_maps[type] == NULL)
 621                         continue;
 622
 623                 kmap = map__kmap(machine->vmlinux_maps[type]);
 624                 map_groups__remove(&machine->kmaps,
 625                                    machine->vmlinux_maps[type]);
 626                 if (kmap->ref_reloc_sym) {
 627                         /*
 628                          * ref_reloc_sym is shared among all maps, so free just
 629                          * on one of them.
 630                          */
 631                         if (type == MAP__FUNCTION) {
 632                                 zfree((char **)&kmap->ref_reloc_sym->name);
 633                                 zfree(&kmap->ref_reloc_sym);
 634                         } else
 635                                 kmap->ref_reloc_sym = NULL;
 636                 }
 637
 638                 map__delete(machine->vmlinux_maps[type]);
 639                 machine->vmlinux_maps[type] = NULL;
 640         }
 641 }
 642
 643 int machines__create_guest_kernel_maps(struct machines *machines)
 644 {
 645         int ret = 0;
 646         struct dirent **namelist = NULL;
 647         int i, items = 0;
 648         char path[PATH_MAX];
 649         pid_t pid;
 650         char *endp;
 651
 652         if (symbol_conf.default_guest_vmlinux_name ||
 653             symbol_conf.default_guest_modules ||
 654             symbol_conf.default_guest_kallsyms) {
 655                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 656         }
 657
 658         if (symbol_conf.guestmount) {
 659                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 660                 if (items <= 0)
 661                         return -ENOENT;
 662                 for (i = 0; i < items; i++) {
 663                         if (!isdigit(namelist[i]->d_name[0])) {
 664                                 /* Filter out . and .. */
 665                                 continue;
 666                         }
 667                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 668                         if ((*endp != '\0') ||
 669                             (endp == namelist[i]->d_name) ||
 670                             (errno == ERANGE)) {
 671                                 pr_debug("invalid directory (%s). Skipping.\n",
 672                                          namelist[i]->d_name);
 673                                 continue;
 674                         }
 675                         sprintf(path, "%s/%s/proc/kallsyms",
 676                                 symbol_conf.guestmount,
 677                                 namelist[i]->d_name);
 678                         ret = access(path, R_OK);
 679                         if (ret) {
 680                                 pr_debug("Can't access file %s\n", path);
 681                                 goto failure;
 682                         }
 683                         machines__create_kernel_maps(machines, pid);
 684                 }
 685 failure:
 686                 free(namelist);
 687         }
 688
 689         return ret;
 690 }
 691
 692 void machines__destroy_kernel_maps(struct machines *machines)
 693 {
 694         struct rb_node *next = rb_first(&machines->guests);
 695
 696         machine__destroy_kernel_maps(&machines->host);
 697
 698         while (next) {
 699                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 700
 701                 next = rb_next(&pos->rb_node);
 702                 rb_erase(&pos->rb_node, &machines->guests);
 703                 machine__delete(pos);
 704         }
 705 }
 706
 707 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 708 {
 709         struct machine *machine = machines__findnew(machines, pid);
 710
 711         if (machine == NULL)
 712                 return -1;
 713
 714         return machine__create_kernel_maps(machine);
 715 }
 716
 717 int machine__load_kallsyms(struct machine *machine, const char *filename,
 718                            enum map_type type, symbol_filter_t filter)
 719 {
 720         struct map *map = machine->vmlinux_maps[type];
 721         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 722
 723         if (ret > 0) {
 724                 dso__set_loaded(map->dso, type);
 725                 /*
 726                  * Since /proc/kallsyms will have multiple sessions for the
 727                  * kernel, with modules between them, fixup the end of all
 728                  * sections.
 729                  */
 730                 __map_groups__fixup_end(&machine->kmaps, type);
 731         }
 732
 733         return ret;
 734 }
 735
 736 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 737                                symbol_filter_t filter)
 738 {
 739         struct map *map = machine->vmlinux_maps[type];
 740         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 741
 742         if (ret > 0)
 743                 dso__set_loaded(map->dso, type);
 744
 745         return ret;
 746 }
 747
 748 static void map_groups__fixup_end(struct map_groups *mg)
 749 {
 750         int i;
 751         for (i = 0; i < MAP__NR_TYPES; ++i)
 752                 __map_groups__fixup_end(mg, i);
 753 }
 754
 755 static char *get_kernel_version(const char *root_dir)
 756 {
 757         char version[PATH_MAX];
 758         FILE *file;
 759         char *name, *tmp;
 760         const char *prefix = "Linux version ";
 761
 762         sprintf(version, "%s/proc/version", root_dir);
 763         file = fopen(version, "r");
 764         if (!file)
 765                 return NULL;
 766
 767         version[0] = '\0';
 768         tmp = fgets(version, sizeof(version), file);
 769         fclose(file);
 770
 771         name = strstr(version, prefix);
 772         if (!name)
 773                 return NULL;
 774         name += strlen(prefix);
 775         tmp = strchr(name, ' ');
 776         if (tmp)
 777                 *tmp = '\0';
 778
 779         return strdup(name);
 780 }
 781
 782 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 783                                 const char *dir_name, int depth)
 784 {
 785         struct dirent *dent;
 786         DIR *dir = opendir(dir_name);
 787         int ret = 0;
 788
 789         if (!dir) {
 790                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 791                 return -1;
 792         }
 793
 794         while ((dent = readdir(dir)) != NULL) {
 795                 char path[PATH_MAX];
 796                 struct stat st;
 797
 798                 /*sshfs might return bad dent->d_type, so we have to stat*/
 799                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 800                 if (stat(path, &st))
 801                         continue;
 802
 803                 if (S_ISDIR(st.st_mode)) {
 804                         if (!strcmp(dent->d_name, ".") ||
 805                             !strcmp(dent->d_name, ".."))
 806                                 continue;
 807
 808                         /* Do not follow top-level source and build symlinks */
 809                         if (depth == 0) {
 810                                 if (!strcmp(dent->d_name, "source") ||
 811                                     !strcmp(dent->d_name, "build"))
 812                                         continue;
 813                         }
 814
 815                         ret = map_groups__set_modules_path_dir(mg, path,
 816                                                                depth + 1);
 817                         if (ret < 0)
 818                                 goto out;
 819                 } else {
 820                         char *dot = strrchr(dent->d_name, '.'),
 821                              dso_name[PATH_MAX];
 822                         struct map *map;
 823                         char *long_name;
 824
 825                         if (dot == NULL || strcmp(dot, ".ko"))
 826                                 continue;
 827                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 828                                  (int)(dot - dent->d_name), dent->d_name);
 829
 830                         strxfrchar(dso_name, '-', '_');
 831                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 832                                                        dso_name);
 833                         if (map == NULL)
 834                                 continue;
 835
 836                         long_name = strdup(path);
 837                         if (long_name == NULL) {
 838                                 ret = -1;
 839                                 goto out;
 840                         }
 841                         dso__set_long_name(map->dso, long_name, true);
 842                         dso__kernel_module_get_build_id(map->dso, "");
 843                 }
 844         }
 845
 846 out:
 847         closedir(dir);
 848         return ret;
 849 }
 850
 851 static int machine__set_modules_path(struct machine *machine)
 852 {
 853         char *version;
 854         char modules_path[PATH_MAX];
 855
 856         version = get_kernel_version(machine->root_dir);
 857         if (!version)
 858                 return -1;
 859
 860         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
 861                  machine->root_dir, version);
 862         free(version);
 863
 864         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
 865 }
 866
 867 static int machine__create_module(void *arg, const char *name, u64 start)
 868 {
 869         struct machine *machine = arg;
 870         struct map *map;
 871
 872         map = machine__new_module(machine, start, name);
 873         if (map == NULL)
 874                 return -1;
 875
 876         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 877
 878         return 0;
 879 }
 880
 881 static int machine__create_modules(struct machine *machine)
 882 {
 883         const char *modules;
 884         char path[PATH_MAX];
 885
 886         if (machine__is_default_guest(machine)) {
 887                 modules = symbol_conf.default_guest_modules;
 888         } else {
 889                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 890                 modules = path;
 891         }
 892
 893         if (symbol__restricted_filename(modules, "/proc/modules"))
 894                 return -1;
 895
 896         if (modules__parse(modules, machine, machine__create_module))
 897                 return -1;
 898
 899         if (!machine__set_modules_path(machine))
 900                 return 0;
 901
 902         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 903
 904         return 0;
 905 }
 906
 907 int machine__create_kernel_maps(struct machine *machine)
 908 {
 909         struct dso *kernel = machine__get_kernel(machine);
 910         const char *name;
 911         u64 addr = machine__get_kernel_start_addr(machine, &name);
 912         if (!addr)
 913                 return -1;
 914
 915         if (kernel == NULL ||
 916             __machine__create_kernel_maps(machine, kernel) < 0)
 917                 return -1;
 918
 919         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 920                 if (machine__is_host(machine))
 921                         pr_debug("Problems creating module maps, "
 922                                  "continuing anyway...\n");
 923                 else
 924                         pr_debug("Problems creating module maps for guest %d, "
 925                                  "continuing anyway...\n", machine->pid);
 926         }
 927
 928         /*
 929          * Now that we have all the maps created, just set the ->end of them:
 930          */
 931         map_groups__fixup_end(&machine->kmaps);
 932
 933         if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
 934                                              addr)) {
 935                 machine__destroy_kernel_maps(machine);
 936                 return -1;
 937         }
 938
 939         return 0;
 940 }
 941
 942 static void machine__set_kernel_mmap_len(struct machine *machine,
 943                                          union perf_event *event)
 944 {
 945         int i;
 946
 947         for (i = 0; i < MAP__NR_TYPES; i++) {
 948                 machine->vmlinux_maps[i]->start = event->mmap.start;
 949                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 950                                                    event->mmap.len);
 951                 /*
 952                  * Be a bit paranoid here, some perf.data file came with
 953                  * a zero sized synthesized MMAP event for the kernel.
 954                  */
 955                 if (machine->vmlinux_maps[i]->end == 0)
 956                         machine->vmlinux_maps[i]->end = ~0ULL;
 957         }
 958 }
 959
 960 static bool machine__uses_kcore(struct machine *machine)
 961 {
 962         struct dso *dso;
 963
 964         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 965                 if (dso__is_kcore(dso))
 966                         return true;
 967         }
 968
 969         return false;
 970 }
 971
 972 static int machine__process_kernel_mmap_event(struct machine *machine,
 973                                               union perf_event *event)
 974 {
 975         struct map *map;
 976         char kmmap_prefix[PATH_MAX];
 977         enum dso_kernel_type kernel_type;
 978         bool is_kernel_mmap;
 979
 980         /* If we have maps from kcore then we do not need or want any others */
 981         if (machine__uses_kcore(machine))
 982                 return 0;
 983
 984         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 985         if (machine__is_host(machine))
 986                 kernel_type = DSO_TYPE_KERNEL;
 987         else
 988                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 989
 990         is_kernel_mmap = memcmp(event->mmap.filename,
 991                                 kmmap_prefix,
 992                                 strlen(kmmap_prefix) - 1) == 0;
 993         if (event->mmap.filename[0] == '/' ||
 994             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 995
 996                 char short_module_name[1024];
 997                 char *name, *dot;
 998
 999                 if (event->mmap.filename[0] == '/') {
1000                         name = strrchr(event->mmap.filename, '/');
1001                         if (name == NULL)
1002                                 goto out_problem;
1003
1004                         ++name; /* skip / */
1005                         dot = strrchr(name, '.');
1006                         if (dot == NULL)
1007                                 goto out_problem;
1008                         snprintf(short_module_name, sizeof(short_module_name),
1009                                         "[%.*s]", (int)(dot - name), name);
1010                         strxfrchar(short_module_name, '-', '_');
1011                 } else
1012                         strcpy(short_module_name, event->mmap.filename);
1013
1014                 map = machine__new_module(machine, event->mmap.start,
1015                                           event->mmap.filename);
1016                 if (map == NULL)
1017                         goto out_problem;
1018
1019                 name = strdup(short_module_name);
1020                 if (name == NULL)
1021                         goto out_problem;
1022
1023                 dso__set_short_name(map->dso, name, true);
1024                 map->end = map->start + event->mmap.len;
1025         } else if (is_kernel_mmap) {
1026                 const char *symbol_name = (event->mmap.filename +
1027                                 strlen(kmmap_prefix));
1028                 /*
1029                  * Should be there already, from the build-id table in
1030                  * the header.
1031                  */
1032                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
1033                                                      kmmap_prefix);
1034                 if (kernel == NULL)
1035                         goto out_problem;
1036
1037                 kernel->kernel = kernel_type;
1038                 if (__machine__create_kernel_maps(machine, kernel) < 0)
1039                         goto out_problem;
1040
1041                 machine__set_kernel_mmap_len(machine, event);
1042
1043                 /*
1044                  * Avoid using a zero address (kptr_restrict) for the ref reloc
1045                  * symbol. Effectively having zero here means that at record
1046                  * time /proc/sys/kernel/kptr_restrict was non zero.
1047                  */
1048                 if (event->mmap.pgoff != 0) {
1049                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
1050                                                          symbol_name,
1051                                                          event->mmap.pgoff);
1052                 }
1053
1054                 if (machine__is_default_guest(machine)) {
1055                         /*
1056                          * preload dso of guest kernel and modules
1057                          */
1058                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1059                                   NULL);
1060                 }
1061         }
1062         return 0;
1063 out_problem:
1064         return -1;
1065 }
1066
1067 int machine__process_mmap2_event(struct machine *machine,
1068                                  union perf_event *event,
1069                                  struct perf_sample *sample __maybe_unused)
1070 {
1071         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1072         struct thread *thread;
1073         struct map *map;
1074         enum map_type type;
1075         int ret = 0;
1076
1077         if (dump_trace)
1078                 perf_event__fprintf_mmap2(event, stdout);
1079
1080         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1081             cpumode == PERF_RECORD_MISC_KERNEL) {
1082                 ret = machine__process_kernel_mmap_event(machine, event);
1083                 if (ret < 0)
1084                         goto out_problem;
1085                 return 0;
1086         }
1087
1088         thread = machine__findnew_thread(machine, event->mmap2.pid,
1089                                         event->mmap2.tid);
1090         if (thread == NULL)
1091                 goto out_problem;
1092
1093         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1094                 type = MAP__VARIABLE;
1095         else
1096                 type = MAP__FUNCTION;
1097
1098         map = map__new(machine, event->mmap2.start,
1099                         event->mmap2.len, event->mmap2.pgoff,
1100                         event->mmap2.pid, event->mmap2.maj,
1101                         event->mmap2.min, event->mmap2.ino,
1102                         event->mmap2.ino_generation,
1103                         event->mmap2.prot,
1104                         event->mmap2.flags,
1105                         event->mmap2.filename, type);
1106
1107         if (map == NULL)
1108                 goto out_problem;
1109
1110         thread__insert_map(thread, map);
1111         return 0;
1112
1113 out_problem:
1114         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1115         return 0;
1116 }
1117
1118 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1119                                 struct perf_sample *sample __maybe_unused)
1120 {
1121         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1122         struct thread *thread;
1123         struct map *map;
1124         enum map_type type;
1125         int ret = 0;
1126
1127         if (dump_trace)
1128                 perf_event__fprintf_mmap(event, stdout);
1129
1130         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1131             cpumode == PERF_RECORD_MISC_KERNEL) {
1132                 ret = machine__process_kernel_mmap_event(machine, event);
1133                 if (ret < 0)
1134                         goto out_problem;
1135                 return 0;
1136         }
1137
1138         thread = machine__findnew_thread(machine, event->mmap.pid,
1139                                          event->mmap.tid);
1140         if (thread == NULL)
1141                 goto out_problem;
1142
1143         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1144                 type = MAP__VARIABLE;
1145         else
1146                 type = MAP__FUNCTION;
1147
1148         map = map__new(machine, event->mmap.start,
1149                         event->mmap.len, event->mmap.pgoff,
1150                         event->mmap.pid, 0, 0, 0, 0, 0, 0,
1151                         event->mmap.filename,
1152                         type);
1153
1154         if (map == NULL)
1155                 goto out_problem;
1156
1157         thread__insert_map(thread, map);
1158         return 0;
1159
1160 out_problem:
1161         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1162         return 0;
1163 }
1164
1165 static void machine__remove_thread(struct machine *machine, struct thread *th)
1166 {
1167         machine->last_match = NULL;
1168         rb_erase(&th->rb_node, &machine->threads);
1169         /*
1170          * We may have references to this thread, for instance in some hist_entry
1171          * instances, so just move them to a separate list.
1172          */
1173         list_add_tail(&th->node, &machine->dead_threads);
1174 }
1175
1176 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1177                                 struct perf_sample *sample)
1178 {
1179         struct thread *thread = machine__find_thread(machine,
1180                                                      event->fork.pid,
1181                                                      event->fork.tid);
1182         struct thread *parent = machine__findnew_thread(machine,
1183                                                         event->fork.ppid,
1184                                                         event->fork.ptid);
1185
1186         /* if a thread currently exists for the thread id remove it */
1187         if (thread != NULL)
1188                 machine__remove_thread(machine, thread);
1189
1190         thread = machine__findnew_thread(machine, event->fork.pid,
1191                                          event->fork.tid);
1192         if (dump_trace)
1193                 perf_event__fprintf_task(event, stdout);
1194
1195         if (thread == NULL || parent == NULL ||
1196             thread__fork(thread, parent, sample->time) < 0) {
1197                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1198                 return -1;
1199         }
1200
1201         return 0;
1202 }
1203
1204 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1205                                 struct perf_sample *sample __maybe_unused)
1206 {
1207         struct thread *thread = machine__find_thread(machine,
1208                                                      event->fork.pid,
1209                                                      event->fork.tid);
1210
1211         if (dump_trace)
1212                 perf_event__fprintf_task(event, stdout);
1213
1214         if (thread != NULL)
1215                 thread__exited(thread);
1216
1217         return 0;
1218 }
1219
1220 int machine__process_event(struct machine *machine, union perf_event *event,
1221                            struct perf_sample *sample)
1222 {
1223         int ret;
1224
1225         switch (event->header.type) {
1226         case PERF_RECORD_COMM:
1227                 ret = machine__process_comm_event(machine, event, sample); break;
1228         case PERF_RECORD_MMAP:
1229                 ret = machine__process_mmap_event(machine, event, sample); break;
1230         case PERF_RECORD_MMAP2:
1231                 ret = machine__process_mmap2_event(machine, event, sample); break;
1232         case PERF_RECORD_FORK:
1233                 ret = machine__process_fork_event(machine, event, sample); break;
1234         case PERF_RECORD_EXIT:
1235                 ret = machine__process_exit_event(machine, event, sample); break;
1236         case PERF_RECORD_LOST:
1237                 ret = machine__process_lost_event(machine, event, sample); break;
1238         default:
1239                 ret = -1;
1240                 break;
1241         }
1242
1243         return ret;
1244 }
1245
1246 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1247 {
1248         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1249                 return 1;
1250         return 0;
1251 }
1252
1253 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1254                             struct addr_map_symbol *ams,
1255                             u64 ip)
1256 {
1257         struct addr_location al;
1258
1259         memset(&al, 0, sizeof(al));
1260         /*
1261          * We cannot use the header.misc hint to determine whether a
1262          * branch stack address is user, kernel, guest, hypervisor.
1263          * Branches may straddle the kernel/user/hypervisor boundaries.
1264          * Thus, we have to try consecutively until we find a match
1265          * or else, the symbol is unknown
1266          */
1267         thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1268
1269         ams->addr = ip;
1270         ams->al_addr = al.addr;
1271         ams->sym = al.sym;
1272         ams->map = al.map;
1273 }
1274
1275 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1276                              u8 m, struct addr_map_symbol *ams, u64 addr)
1277 {
1278         struct addr_location al;
1279
1280         memset(&al, 0, sizeof(al));
1281
1282         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1283                                    &al);
1284         ams->addr = addr;
1285         ams->al_addr = al.addr;
1286         ams->sym = al.sym;
1287         ams->map = al.map;
1288 }
1289
1290 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1291                                      struct addr_location *al)
1292 {
1293         struct mem_info *mi = zalloc(sizeof(*mi));
1294
1295         if (!mi)
1296                 return NULL;
1297
1298         ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1299         ip__resolve_data(al->machine, al->thread, al->cpumode,
1300                          &mi->daddr, sample->addr);
1301         mi->data_src.val = sample->data_src;
1302
1303         return mi;
1304 }
1305
1306 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1307                                            struct addr_location *al)
1308 {
1309         unsigned int i;
1310         const struct branch_stack *bs = sample->branch_stack;
1311         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1312
1313         if (!bi)
1314                 return NULL;
1315
1316         for (i = 0; i < bs->nr; i++) {
1317                 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1318                 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1319                 bi[i].flags = bs->entries[i].flags;
1320         }
1321         return bi;
1322 }
1323
1324 static int machine__resolve_callchain_sample(struct machine *machine,
1325                                              struct thread *thread,
1326                                              struct ip_callchain *chain,
1327                                              struct symbol **parent,
1328                                              struct addr_location *root_al,
1329                                              int max_stack)
1330 {
1331         u8 cpumode = PERF_RECORD_MISC_USER;
1332         int chain_nr = min(max_stack, (int)chain->nr);
1333         int i;
1334         int j;
1335         int err;
1336         int skip_idx __maybe_unused;
1337
1338         callchain_cursor_reset(&callchain_cursor);
1339
1340         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1341                 pr_warning("corrupted callchain. skipping...\n");
1342                 return 0;
1343         }
1344
1345         /*
1346          * Based on DWARF debug information, some architectures skip
1347          * a callchain entry saved by the kernel.
1348          */
1349         skip_idx = arch_skip_callchain_idx(machine, thread, chain);
1350
1351         for (i = 0; i < chain_nr; i++) {
1352                 u64 ip;
1353                 struct addr_location al;
1354
1355                 if (callchain_param.order == ORDER_CALLEE)
1356                         j = i;
1357                 else
1358                         j = chain->nr - i - 1;
1359
1360 #ifdef HAVE_SKIP_CALLCHAIN_IDX
1361                 if (j == skip_idx)
1362                         continue;
1363 #endif
1364                 ip = chain->ips[j];
1365
1366                 if (ip >= PERF_CONTEXT_MAX) {
1367                         switch (ip) {
1368                         case PERF_CONTEXT_HV:
1369                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1370                                 break;
1371                         case PERF_CONTEXT_KERNEL:
1372                                 cpumode = PERF_RECORD_MISC_KERNEL;
1373                                 break;
1374                         case PERF_CONTEXT_USER:
1375                                 cpumode = PERF_RECORD_MISC_USER;
1376                                 break;
1377                         default:
1378                                 pr_debug("invalid callchain context: "
1379                                          "%"PRId64"\n", (s64) ip);
1380                                 /*
1381                                  * It seems the callchain is corrupted.
1382                                  * Discard all.
1383                                  */
1384                                 callchain_cursor_reset(&callchain_cursor);
1385                                 return 0;
1386                         }
1387                         continue;
1388                 }
1389
1390                 al.filtered = 0;
1391                 thread__find_addr_location(thread, machine, cpumode,
1392                                            MAP__FUNCTION, ip, &al);
1393                 if (al.sym != NULL) {
1394                         if (sort__has_parent && !*parent &&
1395                             symbol__match_regex(al.sym, &parent_regex))
1396                                 *parent = al.sym;
1397                         else if (have_ignore_callees && root_al &&
1398                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1399                                 /* Treat this symbol as the root,
1400                                    forgetting its callees. */
1401                                 *root_al = al;
1402                                 callchain_cursor_reset(&callchain_cursor);
1403                         }
1404                 }
1405
1406                 err = callchain_cursor_append(&callchain_cursor,
1407                                               ip, al.map, al.sym);
1408                 if (err)
1409                         return err;
1410         }
1411
1412         return 0;
1413 }
1414
1415 static int unwind_entry(struct unwind_entry *entry, void *arg)
1416 {
1417         struct callchain_cursor *cursor = arg;
1418         return callchain_cursor_append(cursor, entry->ip,
1419                                        entry->map, entry->sym);
1420 }
1421
1422 int machine__resolve_callchain(struct machine *machine,
1423                                struct perf_evsel *evsel,
1424                                struct thread *thread,
1425                                struct perf_sample *sample,
1426                                struct symbol **parent,
1427                                struct addr_location *root_al,
1428                                int max_stack)
1429 {
1430         int ret;
1431
1432         ret = machine__resolve_callchain_sample(machine, thread,
1433                                                 sample->callchain, parent,
1434                                                 root_al, max_stack);
1435         if (ret)
1436                 return ret;
1437
1438         /* Can we do dwarf post unwind? */
1439         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1440               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1441                 return 0;
1442
1443         /* Bail out if nothing was captured. */
1444         if ((!sample->user_regs.regs) ||
1445             (!sample->user_stack.size))
1446                 return 0;
1447
1448         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1449                                    thread, sample, max_stack);
1450
1451 }
1452
1453 int machine__for_each_thread(struct machine *machine,
1454                              int (*fn)(struct thread *thread, void *p),
1455                              void *priv)
1456 {
1457         struct rb_node *nd;
1458         struct thread *thread;
1459         int rc = 0;
1460
1461         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1462                 thread = rb_entry(nd, struct thread, rb_node);
1463                 rc = fn(thread, priv);
1464                 if (rc != 0)
1465                         return rc;
1466         }
1467
1468         list_for_each_entry(thread, &machine->dead_threads, node) {
1469                 rc = fn(thread, priv);
1470                 if (rc != 0)
1471                         return rc;
1472         }
1473         return rc;
1474 }
1475
1476 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1477                                   struct target *target, struct thread_map *threads,
1478                                   perf_event__handler_t process, bool data_mmap)
1479 {
1480         if (target__has_task(target))
1481                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1482         else if (target__has_cpu(target))
1483                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1484         /* command specified */
1485         return 0;
1486 }
1487
1488 pid_t machine__get_current_tid(struct machine *machine, int cpu)
1489 {
1490         if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid)
1491                 return -1;
1492
1493         return machine->current_tid[cpu];
1494 }
1495
1496 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
1497                              pid_t tid)
1498 {
1499         struct thread *thread;
1500
1501         if (cpu < 0)
1502                 return -EINVAL;
1503
1504         if (!machine->current_tid) {
1505                 int i;
1506
1507                 machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t));
1508                 if (!machine->current_tid)
1509                         return -ENOMEM;
1510                 for (i = 0; i < MAX_NR_CPUS; i++)
1511                         machine->current_tid[i] = -1;
1512         }
1513
1514         if (cpu >= MAX_NR_CPUS) {
1515                 pr_err("Requested CPU %d too large. ", cpu);
1516                 pr_err("Consider raising MAX_NR_CPUS\n");
1517                 return -EINVAL;
1518         }
1519
1520         machine->current_tid[cpu] = tid;
1521
1522         thread = machine__findnew_thread(machine, pid, tid);
1523         if (!thread)
1524                 return -ENOMEM;
1525
1526         thread->cpu = cpu;
1527
1528         return 0;
1529 }