tools/perf/util/machine.c

   1 #include <dirent.h>
   2 #include <errno.h>
   3 #include <inttypes.h>
   4 #include <regex.h>
   5 #include "callchain.h"
   6 #include "debug.h"
   7 #include "event.h"
   8 #include "evsel.h"
   9 #include "hist.h"
  10 #include "machine.h"
  11 #include "map.h"
  12 #include "sort.h"
  13 #include "strlist.h"
  14 #include "thread.h"
  15 #include "vdso.h"
  16 #include <stdbool.h>
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <unistd.h>
  20 #include "unwind.h"
  21 #include "linux/hash.h"
  22 #include "asm/bug.h"
  23
  24 #include "sane_ctype.h"
  25 #include <symbol/kallsyms.h>
  26
  27 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
  28
  29 static void dsos__init(struct dsos *dsos)
  30 {
  31         INIT_LIST_HEAD(&dsos->head);
  32         dsos->root = RB_ROOT;
  33         pthread_rwlock_init(&dsos->lock, NULL);
  34 }
  35
  36 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
  37 {
  38         memset(machine, 0, sizeof(*machine));
  39         map_groups__init(&machine->kmaps, machine);
  40         RB_CLEAR_NODE(&machine->rb_node);
  41         dsos__init(&machine->dsos);
  42
  43         machine->threads = RB_ROOT;
  44         pthread_rwlock_init(&machine->threads_lock, NULL);
  45         machine->nr_threads = 0;
  46         INIT_LIST_HEAD(&machine->dead_threads);
  47         machine->last_match = NULL;
  48
  49         machine->vdso_info = NULL;
  50         machine->env = NULL;
  51
  52         machine->pid = pid;
  53
  54         machine->id_hdr_size = 0;
  55         machine->kptr_restrict_warned = false;
  56         machine->comm_exec = false;
  57         machine->kernel_start = 0;
  58
  59         memset(machine->vmlinux_maps, 0, sizeof(machine->vmlinux_maps));
  60
  61         machine->root_dir = strdup(root_dir);
  62         if (machine->root_dir == NULL)
  63                 return -ENOMEM;
  64
  65         if (pid != HOST_KERNEL_ID) {
  66                 struct thread *thread = machine__findnew_thread(machine, -1,
  67                                                                 pid);
  68                 char comm[64];
  69
  70                 if (thread == NULL)
  71                         return -ENOMEM;
  72
  73                 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
  74                 thread__set_comm(thread, comm, 0);
  75                 thread__put(thread);
  76         }
  77
  78         machine->current_tid = NULL;
  79
  80         return 0;
  81 }
  82
  83 struct machine *machine__new_host(void)
  84 {
  85         struct machine *machine = malloc(sizeof(*machine));
  86
  87         if (machine != NULL) {
  88                 machine__init(machine, "", HOST_KERNEL_ID);
  89
  90                 if (machine__create_kernel_maps(machine) < 0)
  91                         goto out_delete;
  92         }
  93
  94         return machine;
  95 out_delete:
  96         free(machine);
  97         return NULL;
  98 }
  99
 100 struct machine *machine__new_kallsyms(void)
 101 {
 102         struct machine *machine = machine__new_host();
 103         /*
 104          * FIXME:
 105          * 1) MAP__FUNCTION will go away when we stop loading separate maps for
 106          *    functions and data objects.
 107          * 2) We should switch to machine__load_kallsyms(), i.e. not explicitely
 108          *    ask for not using the kcore parsing code, once this one is fixed
 109          *    to create a map per module.
 110          */
 111         if (machine && __machine__load_kallsyms(machine, "/proc/kallsyms", MAP__FUNCTION, true) <= 0) {
 112                 machine__delete(machine);
 113                 machine = NULL;
 114         }
 115
 116         return machine;
 117 }
 118
 119 static void dsos__purge(struct dsos *dsos)
 120 {
 121         struct dso *pos, *n;
 122
 123         pthread_rwlock_wrlock(&dsos->lock);
 124
 125         list_for_each_entry_safe(pos, n, &dsos->head, node) {
 126                 RB_CLEAR_NODE(&pos->rb_node);
 127                 pos->root = NULL;
 128                 list_del_init(&pos->node);
 129                 dso__put(pos);
 130         }
 131
 132         pthread_rwlock_unlock(&dsos->lock);
 133 }
 134
 135 static void dsos__exit(struct dsos *dsos)
 136 {
 137         dsos__purge(dsos);
 138         pthread_rwlock_destroy(&dsos->lock);
 139 }
 140
 141 void machine__delete_threads(struct machine *machine)
 142 {
 143         struct rb_node *nd;
 144
 145         pthread_rwlock_wrlock(&machine->threads_lock);
 146         nd = rb_first(&machine->threads);
 147         while (nd) {
 148                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 149
 150                 nd = rb_next(nd);
 151                 __machine__remove_thread(machine, t, false);
 152         }
 153         pthread_rwlock_unlock(&machine->threads_lock);
 154 }
 155
 156 void machine__exit(struct machine *machine)
 157 {
 158         machine__destroy_kernel_maps(machine);
 159         map_groups__exit(&machine->kmaps);
 160         dsos__exit(&machine->dsos);
 161         machine__exit_vdso(machine);
 162         zfree(&machine->root_dir);
 163         zfree(&machine->current_tid);
 164         pthread_rwlock_destroy(&machine->threads_lock);
 165 }
 166
 167 void machine__delete(struct machine *machine)
 168 {
 169         if (machine) {
 170                 machine__exit(machine);
 171                 free(machine);
 172         }
 173 }
 174
 175 void machines__init(struct machines *machines)
 176 {
 177         machine__init(&machines->host, "", HOST_KERNEL_ID);
 178         machines->guests = RB_ROOT;
 179 }
 180
 181 void machines__exit(struct machines *machines)
 182 {
 183         machine__exit(&machines->host);
 184         /* XXX exit guest */
 185 }
 186
 187 struct machine *machines__add(struct machines *machines, pid_t pid,
 188                               const char *root_dir)
 189 {
 190         struct rb_node **p = &machines->guests.rb_node;
 191         struct rb_node *parent = NULL;
 192         struct machine *pos, *machine = malloc(sizeof(*machine));
 193
 194         if (machine == NULL)
 195                 return NULL;
 196
 197         if (machine__init(machine, root_dir, pid) != 0) {
 198                 free(machine);
 199                 return NULL;
 200         }
 201
 202         while (*p != NULL) {
 203                 parent = *p;
 204                 pos = rb_entry(parent, struct machine, rb_node);
 205                 if (pid < pos->pid)
 206                         p = &(*p)->rb_left;
 207                 else
 208                         p = &(*p)->rb_right;
 209         }
 210
 211         rb_link_node(&machine->rb_node, parent, p);
 212         rb_insert_color(&machine->rb_node, &machines->guests);
 213
 214         return machine;
 215 }
 216
 217 void machines__set_comm_exec(struct machines *machines, bool comm_exec)
 218 {
 219         struct rb_node *nd;
 220
 221         machines->host.comm_exec = comm_exec;
 222
 223         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 224                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
 225
 226                 machine->comm_exec = comm_exec;
 227         }
 228 }
 229
 230 struct machine *machines__find(struct machines *machines, pid_t pid)
 231 {
 232         struct rb_node **p = &machines->guests.rb_node;
 233         struct rb_node *parent = NULL;
 234         struct machine *machine;
 235         struct machine *default_machine = NULL;
 236
 237         if (pid == HOST_KERNEL_ID)
 238                 return &machines->host;
 239
 240         while (*p != NULL) {
 241                 parent = *p;
 242                 machine = rb_entry(parent, struct machine, rb_node);
 243                 if (pid < machine->pid)
 244                         p = &(*p)->rb_left;
 245                 else if (pid > machine->pid)
 246                         p = &(*p)->rb_right;
 247                 else
 248                         return machine;
 249                 if (!machine->pid)
 250                         default_machine = machine;
 251         }
 252
 253         return default_machine;
 254 }
 255
 256 struct machine *machines__findnew(struct machines *machines, pid_t pid)
 257 {
 258         char path[PATH_MAX];
 259         const char *root_dir = "";
 260         struct machine *machine = machines__find(machines, pid);
 261
 262         if (machine && (machine->pid == pid))
 263                 goto out;
 264
 265         if ((pid != HOST_KERNEL_ID) &&
 266             (pid != DEFAULT_GUEST_KERNEL_ID) &&
 267             (symbol_conf.guestmount)) {
 268                 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 269                 if (access(path, R_OK)) {
 270                         static struct strlist *seen;
 271
 272                         if (!seen)
 273                                 seen = strlist__new(NULL, NULL);
 274
 275                         if (!strlist__has_entry(seen, path)) {
 276                                 pr_err("Can't access file %s\n", path);
 277                                 strlist__add(seen, path);
 278                         }
 279                         machine = NULL;
 280                         goto out;
 281                 }
 282                 root_dir = path;
 283         }
 284
 285         machine = machines__add(machines, pid, root_dir);
 286 out:
 287         return machine;
 288 }
 289
 290 void machines__process_guests(struct machines *machines,
 291                               machine__process_t process, void *data)
 292 {
 293         struct rb_node *nd;
 294
 295         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 296                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 297                 process(pos, data);
 298         }
 299 }
 300
 301 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 302 {
 303         if (machine__is_host(machine))
 304                 snprintf(bf, size, "[%s]", "kernel.kallsyms");
 305         else if (machine__is_default_guest(machine))
 306                 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 307         else {
 308                 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
 309                          machine->pid);
 310         }
 311
 312         return bf;
 313 }
 314
 315 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 316 {
 317         struct rb_node *node;
 318         struct machine *machine;
 319
 320         machines->host.id_hdr_size = id_hdr_size;
 321
 322         for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 323                 machine = rb_entry(node, struct machine, rb_node);
 324                 machine->id_hdr_size = id_hdr_size;
 325         }
 326
 327         return;
 328 }
 329
 330 static void machine__update_thread_pid(struct machine *machine,
 331                                        struct thread *th, pid_t pid)
 332 {
 333         struct thread *leader;
 334
 335         if (pid == th->pid_ || pid == -1 || th->pid_ != -1)
 336                 return;
 337
 338         th->pid_ = pid;
 339
 340         if (th->pid_ == th->tid)
 341                 return;
 342
 343         leader = __machine__findnew_thread(machine, th->pid_, th->pid_);
 344         if (!leader)
 345                 goto out_err;
 346
 347         if (!leader->mg)
 348                 leader->mg = map_groups__new(machine);
 349
 350         if (!leader->mg)
 351                 goto out_err;
 352
 353         if (th->mg == leader->mg)
 354                 return;
 355
 356         if (th->mg) {
 357                 /*
 358                  * Maps are created from MMAP events which provide the pid and
 359                  * tid.  Consequently there never should be any maps on a thread
 360                  * with an unknown pid.  Just print an error if there are.
 361                  */
 362                 if (!map_groups__empty(th->mg))
 363                         pr_err("Discarding thread maps for %d:%d\n",
 364                                th->pid_, th->tid);
 365                 map_groups__put(th->mg);
 366         }
 367
 368         th->mg = map_groups__get(leader->mg);
 369 out_put:
 370         thread__put(leader);
 371         return;
 372 out_err:
 373         pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
 374         goto out_put;
 375 }
 376
 377 /*
 378  * Caller must eventually drop thread->refcnt returned with a successful
 379  * lookup/new thread inserted.
 380  */
 381 static struct thread *____machine__findnew_thread(struct machine *machine,
 382                                                   pid_t pid, pid_t tid,
 383                                                   bool create)
 384 {
 385         struct rb_node **p = &machine->threads.rb_node;
 386         struct rb_node *parent = NULL;
 387         struct thread *th;
 388
 389         /*
 390          * Front-end cache - TID lookups come in blocks,
 391          * so most of the time we dont have to look up
 392          * the full rbtree:
 393          */
 394         th = machine->last_match;
 395         if (th != NULL) {
 396                 if (th->tid == tid) {
 397                         machine__update_thread_pid(machine, th, pid);
 398                         return thread__get(th);
 399                 }
 400
 401                 machine->last_match = NULL;
 402         }
 403
 404         while (*p != NULL) {
 405                 parent = *p;
 406                 th = rb_entry(parent, struct thread, rb_node);
 407
 408                 if (th->tid == tid) {
 409                         machine->last_match = th;
 410                         machine__update_thread_pid(machine, th, pid);
 411                         return thread__get(th);
 412                 }
 413
 414                 if (tid < th->tid)
 415                         p = &(*p)->rb_left;
 416                 else
 417                         p = &(*p)->rb_right;
 418         }
 419
 420         if (!create)
 421                 return NULL;
 422
 423         th = thread__new(pid, tid);
 424         if (th != NULL) {
 425                 rb_link_node(&th->rb_node, parent, p);
 426                 rb_insert_color(&th->rb_node, &machine->threads);
 427
 428                 /*
 429                  * We have to initialize map_groups separately
 430                  * after rb tree is updated.
 431                  *
 432                  * The reason is that we call machine__findnew_thread
 433                  * within thread__init_map_groups to find the thread
 434                  * leader and that would screwed the rb tree.
 435                  */
 436                 if (thread__init_map_groups(th, machine)) {
 437                         rb_erase_init(&th->rb_node, &machine->threads);
 438                         RB_CLEAR_NODE(&th->rb_node);
 439                         thread__put(th);
 440                         return NULL;
 441                 }
 442                 /*
 443                  * It is now in the rbtree, get a ref
 444                  */
 445                 thread__get(th);
 446                 machine->last_match = th;
 447                 ++machine->nr_threads;
 448         }
 449
 450         return th;
 451 }
 452
 453 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
 454 {
 455         return ____machine__findnew_thread(machine, pid, tid, true);
 456 }
 457
 458 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
 459                                        pid_t tid)
 460 {
 461         struct thread *th;
 462
 463         pthread_rwlock_wrlock(&machine->threads_lock);
 464         th = __machine__findnew_thread(machine, pid, tid);
 465         pthread_rwlock_unlock(&machine->threads_lock);
 466         return th;
 467 }
 468
 469 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
 470                                     pid_t tid)
 471 {
 472         struct thread *th;
 473         pthread_rwlock_rdlock(&machine->threads_lock);
 474         th =  ____machine__findnew_thread(machine, pid, tid, false);
 475         pthread_rwlock_unlock(&machine->threads_lock);
 476         return th;
 477 }
 478
 479 struct comm *machine__thread_exec_comm(struct machine *machine,
 480                                        struct thread *thread)
 481 {
 482         if (machine->comm_exec)
 483                 return thread__exec_comm(thread);
 484         else
 485                 return thread__comm(thread);
 486 }
 487
 488 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 489                                 struct perf_sample *sample)
 490 {
 491         struct thread *thread = machine__findnew_thread(machine,
 492                                                         event->comm.pid,
 493                                                         event->comm.tid);
 494         bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
 495         int err = 0;
 496
 497         if (exec)
 498                 machine->comm_exec = true;
 499
 500         if (dump_trace)
 501                 perf_event__fprintf_comm(event, stdout);
 502
 503         if (thread == NULL ||
 504             __thread__set_comm(thread, event->comm.comm, sample->time, exec)) {
 505                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 506                 err = -1;
 507         }
 508
 509         thread__put(thread);
 510
 511         return err;
 512 }
 513
 514 int machine__process_namespaces_event(struct machine *machine __maybe_unused,
 515                                       union perf_event *event,
 516                                       struct perf_sample *sample __maybe_unused)
 517 {
 518         struct thread *thread = machine__findnew_thread(machine,
 519                                                         event->namespaces.pid,
 520                                                         event->namespaces.tid);
 521         int err = 0;
 522
 523         WARN_ONCE(event->namespaces.nr_namespaces > NR_NAMESPACES,
 524                   "\nWARNING: kernel seems to support more namespaces than perf"
 525                   " tool.\nTry updating the perf tool..\n\n");
 526
 527         WARN_ONCE(event->namespaces.nr_namespaces < NR_NAMESPACES,
 528                   "\nWARNING: perf tool seems to support more namespaces than"
 529                   " the kernel.\nTry updating the kernel..\n\n");
 530
 531         if (dump_trace)
 532                 perf_event__fprintf_namespaces(event, stdout);
 533
 534         if (thread == NULL ||
 535             thread__set_namespaces(thread, sample->time, &event->namespaces)) {
 536                 dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n");
 537                 err = -1;
 538         }
 539
 540         thread__put(thread);
 541
 542         return err;
 543 }
 544
 545 int machine__process_lost_event(struct machine *machine __maybe_unused,
 546                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 547 {
 548         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 549                     event->lost.id, event->lost.lost);
 550         return 0;
 551 }
 552
 553 int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
 554                                         union perf_event *event, struct perf_sample *sample)
 555 {
 556         dump_printf(": id:%" PRIu64 ": lost samples :%" PRIu64 "\n",
 557                     sample->id, event->lost_samples.lost);
 558         return 0;
 559 }
 560
 561 static struct dso *machine__findnew_module_dso(struct machine *machine,
 562                                                struct kmod_path *m,
 563                                                const char *filename)
 564 {
 565         struct dso *dso;
 566
 567         pthread_rwlock_wrlock(&machine->dsos.lock);
 568
 569         dso = __dsos__find(&machine->dsos, m->name, true);
 570         if (!dso) {
 571                 dso = __dsos__addnew(&machine->dsos, m->name);
 572                 if (dso == NULL)
 573                         goto out_unlock;
 574
 575                 dso__set_module_info(dso, m, machine);
 576                 dso__set_long_name(dso, strdup(filename), true);
 577         }
 578
 579         dso__get(dso);
 580 out_unlock:
 581         pthread_rwlock_unlock(&machine->dsos.lock);
 582         return dso;
 583 }
 584
 585 int machine__process_aux_event(struct machine *machine __maybe_unused,
 586                                union perf_event *event)
 587 {
 588         if (dump_trace)
 589                 perf_event__fprintf_aux(event, stdout);
 590         return 0;
 591 }
 592
 593 int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
 594                                         union perf_event *event)
 595 {
 596         if (dump_trace)
 597                 perf_event__fprintf_itrace_start(event, stdout);
 598         return 0;
 599 }
 600
 601 int machine__process_switch_event(struct machine *machine __maybe_unused,
 602                                   union perf_event *event)
 603 {
 604         if (dump_trace)
 605                 perf_event__fprintf_switch(event, stdout);
 606         return 0;
 607 }
 608
 609 static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
 610 {
 611         const char *dup_filename;
 612
 613         if (!filename || !dso || !dso->long_name)
 614                 return;
 615         if (dso->long_name[0] != '[')
 616                 return;
 617         if (!strchr(filename, '/'))
 618                 return;
 619
 620         dup_filename = strdup(filename);
 621         if (!dup_filename)
 622                 return;
 623
 624         dso__set_long_name(dso, dup_filename, true);
 625 }
 626
 627 struct map *machine__findnew_module_map(struct machine *machine, u64 start,
 628                                         const char *filename)
 629 {
 630         struct map *map = NULL;
 631         struct dso *dso = NULL;
 632         struct kmod_path m;
 633
 634         if (kmod_path__parse_name(&m, filename))
 635                 return NULL;
 636
 637         map = map_groups__find_by_name(&machine->kmaps, MAP__FUNCTION,
 638                                        m.name);
 639         if (map) {
 640                 /*
 641                  * If the map's dso is an offline module, give dso__load()
 642                  * a chance to find the file path of that module by fixing
 643                  * long_name.
 644                  */
 645                 dso__adjust_kmod_long_name(map->dso, filename);
 646                 goto out;
 647         }
 648
 649         dso = machine__findnew_module_dso(machine, &m, filename);
 650         if (dso == NULL)
 651                 goto out;
 652
 653         map = map__new2(start, dso, MAP__FUNCTION);
 654         if (map == NULL)
 655                 goto out;
 656
 657         map_groups__insert(&machine->kmaps, map);
 658
 659         /* Put the map here because map_groups__insert alread got it */
 660         map__put(map);
 661 out:
 662         /* put the dso here, corresponding to  machine__findnew_module_dso */
 663         dso__put(dso);
 664         free(m.name);
 665         return map;
 666 }
 667
 668 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 669 {
 670         struct rb_node *nd;
 671         size_t ret = __dsos__fprintf(&machines->host.dsos.head, fp);
 672
 673         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 674                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 675                 ret += __dsos__fprintf(&pos->dsos.head, fp);
 676         }
 677
 678         return ret;
 679 }
 680
 681 size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp,
 682                                      bool (skip)(struct dso *dso, int parm), int parm)
 683 {
 684         return __dsos__fprintf_buildid(&m->dsos.head, fp, skip, parm);
 685 }
 686
 687 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 688                                      bool (skip)(struct dso *dso, int parm), int parm)
 689 {
 690         struct rb_node *nd;
 691         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 692
 693         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 694                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 695                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 696         }
 697         return ret;
 698 }
 699
 700 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 701 {
 702         int i;
 703         size_t printed = 0;
 704         struct dso *kdso = machine__kernel_map(machine)->dso;
 705
 706         if (kdso->has_build_id) {
 707                 char filename[PATH_MAX];
 708                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 709                         printed += fprintf(fp, "[0] %s\n", filename);
 710         }
 711
 712         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 713                 printed += fprintf(fp, "[%d] %s\n",
 714                                    i + kdso->has_build_id, vmlinux_path[i]);
 715
 716         return printed;
 717 }
 718
 719 size_t machine__fprintf(struct machine *machine, FILE *fp)
 720 {
 721         size_t ret;
 722         struct rb_node *nd;
 723
 724         pthread_rwlock_rdlock(&machine->threads_lock);
 725
 726         ret = fprintf(fp, "Threads: %u\n", machine->nr_threads);
 727
 728         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 729                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 730
 731                 ret += thread__fprintf(pos, fp);
 732         }
 733
 734         pthread_rwlock_unlock(&machine->threads_lock);
 735
 736         return ret;
 737 }
 738
 739 static struct dso *machine__get_kernel(struct machine *machine)
 740 {
 741         const char *vmlinux_name = NULL;
 742         struct dso *kernel;
 743
 744         if (machine__is_host(machine)) {
 745                 vmlinux_name = symbol_conf.vmlinux_name;
 746                 if (!vmlinux_name)
 747                         vmlinux_name = DSO__NAME_KALLSYMS;
 748
 749                 kernel = machine__findnew_kernel(machine, vmlinux_name,
 750                                                  "[kernel]", DSO_TYPE_KERNEL);
 751         } else {
 752                 char bf[PATH_MAX];
 753
 754                 if (machine__is_default_guest(machine))
 755                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 756                 if (!vmlinux_name)
 757                         vmlinux_name = machine__mmap_name(machine, bf,
 758                                                           sizeof(bf));
 759
 760                 kernel = machine__findnew_kernel(machine, vmlinux_name,
 761                                                  "[guest.kernel]",
 762                                                  DSO_TYPE_GUEST_KERNEL);
 763         }
 764
 765         if (kernel != NULL && (!kernel->has_build_id))
 766                 dso__read_running_kernel_build_id(kernel, machine);
 767
 768         return kernel;
 769 }
 770
 771 struct process_args {
 772         u64 start;
 773 };
 774
 775 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 776                                            size_t bufsz)
 777 {
 778         if (machine__is_default_guest(machine))
 779                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 780         else
 781                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 782 }
 783
 784 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 785
 786 /* Figure out the start address of kernel map from /proc/kallsyms.
 787  * Returns the name of the start symbol in *symbol_name. Pass in NULL as
 788  * symbol_name if it's not that important.
 789  */
 790 static int machine__get_running_kernel_start(struct machine *machine,
 791                                              const char **symbol_name, u64 *start)
 792 {
 793         char filename[PATH_MAX];
 794         int i, err = -1;
 795         const char *name;
 796         u64 addr = 0;
 797
 798         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 799
 800         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 801                 return 0;
 802
 803         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 804                 err = kallsyms__get_function_start(filename, name, &addr);
 805                 if (!err)
 806                         break;
 807         }
 808
 809         if (err)
 810                 return -1;
 811
 812         if (symbol_name)
 813                 *symbol_name = name;
 814
 815         *start = addr;
 816         return 0;
 817 }
 818
 819 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 820 {
 821         int type;
 822         u64 start = 0;
 823
 824         if (machine__get_running_kernel_start(machine, NULL, &start))
 825                 return -1;
 826
 827         /* In case of renewal the kernel map, destroy previous one */
 828         machine__destroy_kernel_maps(machine);
 829
 830         for (type = 0; type < MAP__NR_TYPES; ++type) {
 831                 struct kmap *kmap;
 832                 struct map *map;
 833
 834                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 835                 if (machine->vmlinux_maps[type] == NULL)
 836                         return -1;
 837
 838                 machine->vmlinux_maps[type]->map_ip =
 839                         machine->vmlinux_maps[type]->unmap_ip =
 840                                 identity__map_ip;
 841                 map = __machine__kernel_map(machine, type);
 842                 kmap = map__kmap(map);
 843                 if (!kmap)
 844                         return -1;
 845
 846                 kmap->kmaps = &machine->kmaps;
 847                 map_groups__insert(&machine->kmaps, map);
 848         }
 849
 850         return 0;
 851 }
 852
 853 void machine__destroy_kernel_maps(struct machine *machine)
 854 {
 855         int type;
 856
 857         for (type = 0; type < MAP__NR_TYPES; ++type) {
 858                 struct kmap *kmap;
 859                 struct map *map = __machine__kernel_map(machine, type);
 860
 861                 if (map == NULL)
 862                         continue;
 863
 864                 kmap = map__kmap(map);
 865                 map_groups__remove(&machine->kmaps, map);
 866                 if (kmap && kmap->ref_reloc_sym) {
 867                         /*
 868                          * ref_reloc_sym is shared among all maps, so free just
 869                          * on one of them.
 870                          */
 871                         if (type == MAP__FUNCTION) {
 872                                 zfree((char **)&kmap->ref_reloc_sym->name);
 873                                 zfree(&kmap->ref_reloc_sym);
 874                         } else
 875                                 kmap->ref_reloc_sym = NULL;
 876                 }
 877
 878                 map__put(machine->vmlinux_maps[type]);
 879                 machine->vmlinux_maps[type] = NULL;
 880         }
 881 }
 882
 883 int machines__create_guest_kernel_maps(struct machines *machines)
 884 {
 885         int ret = 0;
 886         struct dirent **namelist = NULL;
 887         int i, items = 0;
 888         char path[PATH_MAX];
 889         pid_t pid;
 890         char *endp;
 891
 892         if (symbol_conf.default_guest_vmlinux_name ||
 893             symbol_conf.default_guest_modules ||
 894             symbol_conf.default_guest_kallsyms) {
 895                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 896         }
 897
 898         if (symbol_conf.guestmount) {
 899                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 900                 if (items <= 0)
 901                         return -ENOENT;
 902                 for (i = 0; i < items; i++) {
 903                         if (!isdigit(namelist[i]->d_name[0])) {
 904                                 /* Filter out . and .. */
 905                                 continue;
 906                         }
 907                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 908                         if ((*endp != '\0') ||
 909                             (endp == namelist[i]->d_name) ||
 910                             (errno == ERANGE)) {
 911                                 pr_debug("invalid directory (%s). Skipping.\n",
 912                                          namelist[i]->d_name);
 913                                 continue;
 914                         }
 915                         sprintf(path, "%s/%s/proc/kallsyms",
 916                                 symbol_conf.guestmount,
 917                                 namelist[i]->d_name);
 918                         ret = access(path, R_OK);
 919                         if (ret) {
 920                                 pr_debug("Can't access file %s\n", path);
 921                                 goto failure;
 922                         }
 923                         machines__create_kernel_maps(machines, pid);
 924                 }
 925 failure:
 926                 free(namelist);
 927         }
 928
 929         return ret;
 930 }
 931
 932 void machines__destroy_kernel_maps(struct machines *machines)
 933 {
 934         struct rb_node *next = rb_first(&machines->guests);
 935
 936         machine__destroy_kernel_maps(&machines->host);
 937
 938         while (next) {
 939                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 940
 941                 next = rb_next(&pos->rb_node);
 942                 rb_erase(&pos->rb_node, &machines->guests);
 943                 machine__delete(pos);
 944         }
 945 }
 946
 947 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 948 {
 949         struct machine *machine = machines__findnew(machines, pid);
 950
 951         if (machine == NULL)
 952                 return -1;
 953
 954         return machine__create_kernel_maps(machine);
 955 }
 956
 957 int __machine__load_kallsyms(struct machine *machine, const char *filename,
 958                              enum map_type type, bool no_kcore)
 959 {
 960         struct map *map = machine__kernel_map(machine);
 961         int ret = __dso__load_kallsyms(map->dso, filename, map, no_kcore);
 962
 963         if (ret > 0) {
 964                 dso__set_loaded(map->dso, type);
 965                 /*
 966                  * Since /proc/kallsyms will have multiple sessions for the
 967                  * kernel, with modules between them, fixup the end of all
 968                  * sections.
 969                  */
 970                 __map_groups__fixup_end(&machine->kmaps, type);
 971         }
 972
 973         return ret;
 974 }
 975
 976 int machine__load_kallsyms(struct machine *machine, const char *filename,
 977                            enum map_type type)
 978 {
 979         return __machine__load_kallsyms(machine, filename, type, false);
 980 }
 981
 982 int machine__load_vmlinux_path(struct machine *machine, enum map_type type)
 983 {
 984         struct map *map = machine__kernel_map(machine);
 985         int ret = dso__load_vmlinux_path(map->dso, map);
 986
 987         if (ret > 0)
 988                 dso__set_loaded(map->dso, type);
 989
 990         return ret;
 991 }
 992
 993 static void map_groups__fixup_end(struct map_groups *mg)
 994 {
 995         int i;
 996         for (i = 0; i < MAP__NR_TYPES; ++i)
 997                 __map_groups__fixup_end(mg, i);
 998 }
 999
1000 static char *get_kernel_version(const char *root_dir)
1001 {
1002         char version[PATH_MAX];
1003         FILE *file;
1004         char *name, *tmp;
1005         const char *prefix = "Linux version ";
1006
1007         sprintf(version, "%s/proc/version", root_dir);
1008         file = fopen(version, "r");
1009         if (!file)
1010                 return NULL;
1011
1012         version[0] = '\0';
1013         tmp = fgets(version, sizeof(version), file);
1014         fclose(file);
1015
1016         name = strstr(version, prefix);
1017         if (!name)
1018                 return NULL;
1019         name += strlen(prefix);
1020         tmp = strchr(name, ' ');
1021         if (tmp)
1022                 *tmp = '\0';
1023
1024         return strdup(name);
1025 }
1026
1027 static bool is_kmod_dso(struct dso *dso)
1028 {
1029         return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1030                dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1031 }
1032
1033 static int map_groups__set_module_path(struct map_groups *mg, const char *path,
1034                                        struct kmod_path *m)
1035 {
1036         struct map *map;
1037         char *long_name;
1038
1039         map = map_groups__find_by_name(mg, MAP__FUNCTION, m->name);
1040         if (map == NULL)
1041                 return 0;
1042
1043         long_name = strdup(path);
1044         if (long_name == NULL)
1045                 return -ENOMEM;
1046
1047         dso__set_long_name(map->dso, long_name, true);
1048         dso__kernel_module_get_build_id(map->dso, "");
1049
1050         /*
1051          * Full name could reveal us kmod compression, so
1052          * we need to update the symtab_type if needed.
1053          */
1054         if (m->comp && is_kmod_dso(map->dso))
1055                 map->dso->symtab_type++;
1056
1057         return 0;
1058 }
1059
1060 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1061                                 const char *dir_name, int depth)
1062 {
1063         struct dirent *dent;
1064         DIR *dir = opendir(dir_name);
1065         int ret = 0;
1066
1067         if (!dir) {
1068                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1069                 return -1;
1070         }
1071
1072         while ((dent = readdir(dir)) != NULL) {
1073                 char path[PATH_MAX];
1074                 struct stat st;
1075
1076                 /*sshfs might return bad dent->d_type, so we have to stat*/
1077                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1078                 if (stat(path, &st))
1079                         continue;
1080
1081                 if (S_ISDIR(st.st_mode)) {
1082                         if (!strcmp(dent->d_name, ".") ||
1083                             !strcmp(dent->d_name, ".."))
1084                                 continue;
1085
1086                         /* Do not follow top-level source and build symlinks */
1087                         if (depth == 0) {
1088                                 if (!strcmp(dent->d_name, "source") ||
1089                                     !strcmp(dent->d_name, "build"))
1090                                         continue;
1091                         }
1092
1093                         ret = map_groups__set_modules_path_dir(mg, path,
1094                                                                depth + 1);
1095                         if (ret < 0)
1096                                 goto out;
1097                 } else {
1098                         struct kmod_path m;
1099
1100                         ret = kmod_path__parse_name(&m, dent->d_name);
1101                         if (ret)
1102                                 goto out;
1103
1104                         if (m.kmod)
1105                                 ret = map_groups__set_module_path(mg, path, &m);
1106
1107                         free(m.name);
1108
1109                         if (ret)
1110                                 goto out;
1111                 }
1112         }
1113
1114 out:
1115         closedir(dir);
1116         return ret;
1117 }
1118
1119 static int machine__set_modules_path(struct machine *machine)
1120 {
1121         char *version;
1122         char modules_path[PATH_MAX];
1123
1124         version = get_kernel_version(machine->root_dir);
1125         if (!version)
1126                 return -1;
1127
1128         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
1129                  machine->root_dir, version);
1130         free(version);
1131
1132         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
1133 }
1134 int __weak arch__fix_module_text_start(u64 *start __maybe_unused,
1135                                 const char *name __maybe_unused)
1136 {
1137         return 0;
1138 }
1139
1140 static int machine__create_module(void *arg, const char *name, u64 start)
1141 {
1142         struct machine *machine = arg;
1143         struct map *map;
1144
1145         if (arch__fix_module_text_start(&start, name) < 0)
1146                 return -1;
1147
1148         map = machine__findnew_module_map(machine, start, name);
1149         if (map == NULL)
1150                 return -1;
1151
1152         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1153
1154         return 0;
1155 }
1156
1157 static int machine__create_modules(struct machine *machine)
1158 {
1159         const char *modules;
1160         char path[PATH_MAX];
1161
1162         if (machine__is_default_guest(machine)) {
1163                 modules = symbol_conf.default_guest_modules;
1164         } else {
1165                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
1166                 modules = path;
1167         }
1168
1169         if (symbol__restricted_filename(modules, "/proc/modules"))
1170                 return -1;
1171
1172         if (modules__parse(modules, machine, machine__create_module))
1173                 return -1;
1174
1175         if (!machine__set_modules_path(machine))
1176                 return 0;
1177
1178         pr_debug("Problems setting modules path maps, continuing anyway...\n");
1179
1180         return 0;
1181 }
1182
1183 int machine__create_kernel_maps(struct machine *machine)
1184 {
1185         struct dso *kernel = machine__get_kernel(machine);
1186         const char *name = NULL;
1187         u64 addr = 0;
1188         int ret;
1189
1190         if (kernel == NULL)
1191                 return -1;
1192
1193         ret = __machine__create_kernel_maps(machine, kernel);
1194         dso__put(kernel);
1195         if (ret < 0)
1196                 return -1;
1197
1198         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
1199                 if (machine__is_host(machine))
1200                         pr_debug("Problems creating module maps, "
1201                                  "continuing anyway...\n");
1202                 else
1203                         pr_debug("Problems creating module maps for guest %d, "
1204                                  "continuing anyway...\n", machine->pid);
1205         }
1206
1207         /*
1208          * Now that we have all the maps created, just set the ->end of them:
1209          */
1210         map_groups__fixup_end(&machine->kmaps);
1211
1212         if (!machine__get_running_kernel_start(machine, &name, &addr)) {
1213                 if (name &&
1214                     maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name, addr)) {
1215                         machine__destroy_kernel_maps(machine);
1216                         return -1;
1217                 }
1218         }
1219
1220         return 0;
1221 }
1222
1223 static void machine__set_kernel_mmap_len(struct machine *machine,
1224                                          union perf_event *event)
1225 {
1226         int i;
1227
1228         for (i = 0; i < MAP__NR_TYPES; i++) {
1229                 machine->vmlinux_maps[i]->start = event->mmap.start;
1230                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
1231                                                    event->mmap.len);
1232                 /*
1233                  * Be a bit paranoid here, some perf.data file came with
1234                  * a zero sized synthesized MMAP event for the kernel.
1235                  */
1236                 if (machine->vmlinux_maps[i]->end == 0)
1237                         machine->vmlinux_maps[i]->end = ~0ULL;
1238         }
1239 }
1240
1241 static bool machine__uses_kcore(struct machine *machine)
1242 {
1243         struct dso *dso;
1244
1245         list_for_each_entry(dso, &machine->dsos.head, node) {
1246                 if (dso__is_kcore(dso))
1247                         return true;
1248         }
1249
1250         return false;
1251 }
1252
1253 static int machine__process_kernel_mmap_event(struct machine *machine,
1254                                               union perf_event *event)
1255 {
1256         struct map *map;
1257         char kmmap_prefix[PATH_MAX];
1258         enum dso_kernel_type kernel_type;
1259         bool is_kernel_mmap;
1260
1261         /* If we have maps from kcore then we do not need or want any others */
1262         if (machine__uses_kcore(machine))
1263                 return 0;
1264
1265         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
1266         if (machine__is_host(machine))
1267                 kernel_type = DSO_TYPE_KERNEL;
1268         else
1269                 kernel_type = DSO_TYPE_GUEST_KERNEL;
1270
1271         is_kernel_mmap = memcmp(event->mmap.filename,
1272                                 kmmap_prefix,
1273                                 strlen(kmmap_prefix) - 1) == 0;
1274         if (event->mmap.filename[0] == '/' ||
1275             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
1276                 map = machine__findnew_module_map(machine, event->mmap.start,
1277                                                   event->mmap.filename);
1278                 if (map == NULL)
1279                         goto out_problem;
1280
1281                 map->end = map->start + event->mmap.len;
1282         } else if (is_kernel_mmap) {
1283                 const char *symbol_name = (event->mmap.filename +
1284                                 strlen(kmmap_prefix));
1285                 /*
1286                  * Should be there already, from the build-id table in
1287                  * the header.
1288                  */
1289                 struct dso *kernel = NULL;
1290                 struct dso *dso;
1291
1292                 pthread_rwlock_rdlock(&machine->dsos.lock);
1293
1294                 list_for_each_entry(dso, &machine->dsos.head, node) {
1295
1296                         /*
1297                          * The cpumode passed to is_kernel_module is not the
1298                          * cpumode of *this* event. If we insist on passing
1299                          * correct cpumode to is_kernel_module, we should
1300                          * record the cpumode when we adding this dso to the
1301                          * linked list.
1302                          *
1303                          * However we don't really need passing correct
1304                          * cpumode.  We know the correct cpumode must be kernel
1305                          * mode (if not, we should not link it onto kernel_dsos
1306                          * list).
1307                          *
1308                          * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
1309                          * is_kernel_module() treats it as a kernel cpumode.
1310                          */
1311
1312                         if (!dso->kernel ||
1313                             is_kernel_module(dso->long_name,
1314                                              PERF_RECORD_MISC_CPUMODE_UNKNOWN))
1315                                 continue;
1316
1317
1318                         kernel = dso;
1319                         break;
1320                 }
1321
1322                 pthread_rwlock_unlock(&machine->dsos.lock);
1323
1324                 if (kernel == NULL)
1325                         kernel = machine__findnew_dso(machine, kmmap_prefix);
1326                 if (kernel == NULL)
1327                         goto out_problem;
1328
1329                 kernel->kernel = kernel_type;
1330                 if (__machine__create_kernel_maps(machine, kernel) < 0) {
1331                         dso__put(kernel);
1332                         goto out_problem;
1333                 }
1334
1335                 if (strstr(kernel->long_name, "vmlinux"))
1336                         dso__set_short_name(kernel, "[kernel.vmlinux]", false);
1337
1338                 machine__set_kernel_mmap_len(machine, event);
1339
1340                 /*
1341                  * Avoid using a zero address (kptr_restrict) for the ref reloc
1342                  * symbol. Effectively having zero here means that at record
1343                  * time /proc/sys/kernel/kptr_restrict was non zero.
1344                  */
1345                 if (event->mmap.pgoff != 0) {
1346                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
1347                                                          symbol_name,
1348                                                          event->mmap.pgoff);
1349                 }
1350
1351                 if (machine__is_default_guest(machine)) {
1352                         /*
1353                          * preload dso of guest kernel and modules
1354                          */
1355                         dso__load(kernel, machine__kernel_map(machine));
1356                 }
1357         }
1358         return 0;
1359 out_problem:
1360         return -1;
1361 }
1362
1363 int machine__process_mmap2_event(struct machine *machine,
1364                                  union perf_event *event,
1365                                  struct perf_sample *sample)
1366 {
1367         struct thread *thread;
1368         struct map *map;
1369         enum map_type type;
1370         int ret = 0;
1371
1372         if (dump_trace)
1373                 perf_event__fprintf_mmap2(event, stdout);
1374
1375         if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1376             sample->cpumode == PERF_RECORD_MISC_KERNEL) {
1377                 ret = machine__process_kernel_mmap_event(machine, event);
1378                 if (ret < 0)
1379                         goto out_problem;
1380                 return 0;
1381         }
1382
1383         thread = machine__findnew_thread(machine, event->mmap2.pid,
1384                                         event->mmap2.tid);
1385         if (thread == NULL)
1386                 goto out_problem;
1387
1388         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1389                 type = MAP__VARIABLE;
1390         else
1391                 type = MAP__FUNCTION;
1392
1393         map = map__new(machine, event->mmap2.start,
1394                         event->mmap2.len, event->mmap2.pgoff,
1395                         event->mmap2.pid, event->mmap2.maj,
1396                         event->mmap2.min, event->mmap2.ino,
1397                         event->mmap2.ino_generation,
1398                         event->mmap2.prot,
1399                         event->mmap2.flags,
1400                         event->mmap2.filename, type, thread);
1401
1402         if (map == NULL)
1403                 goto out_problem_map;
1404
1405         ret = thread__insert_map(thread, map);
1406         if (ret)
1407                 goto out_problem_insert;
1408
1409         thread__put(thread);
1410         map__put(map);
1411         return 0;
1412
1413 out_problem_insert:
1414         map__put(map);
1415 out_problem_map:
1416         thread__put(thread);
1417 out_problem:
1418         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1419         return 0;
1420 }
1421
1422 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1423                                 struct perf_sample *sample)
1424 {
1425         struct thread *thread;
1426         struct map *map;
1427         enum map_type type;
1428         int ret = 0;
1429
1430         if (dump_trace)
1431                 perf_event__fprintf_mmap(event, stdout);
1432
1433         if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1434             sample->cpumode == PERF_RECORD_MISC_KERNEL) {
1435                 ret = machine__process_kernel_mmap_event(machine, event);
1436                 if (ret < 0)
1437                         goto out_problem;
1438                 return 0;
1439         }
1440
1441         thread = machine__findnew_thread(machine, event->mmap.pid,
1442                                          event->mmap.tid);
1443         if (thread == NULL)
1444                 goto out_problem;
1445
1446         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1447                 type = MAP__VARIABLE;
1448         else
1449                 type = MAP__FUNCTION;
1450
1451         map = map__new(machine, event->mmap.start,
1452                         event->mmap.len, event->mmap.pgoff,
1453                         event->mmap.pid, 0, 0, 0, 0, 0, 0,
1454                         event->mmap.filename,
1455                         type, thread);
1456
1457         if (map == NULL)
1458                 goto out_problem_map;
1459
1460         ret = thread__insert_map(thread, map);
1461         if (ret)
1462                 goto out_problem_insert;
1463
1464         thread__put(thread);
1465         map__put(map);
1466         return 0;
1467
1468 out_problem_insert:
1469         map__put(map);
1470 out_problem_map:
1471         thread__put(thread);
1472 out_problem:
1473         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1474         return 0;
1475 }
1476
1477 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock)
1478 {
1479         if (machine->last_match == th)
1480                 machine->last_match = NULL;
1481
1482         BUG_ON(refcount_read(&th->refcnt) == 0);
1483         if (lock)
1484                 pthread_rwlock_wrlock(&machine->threads_lock);
1485         rb_erase_init(&th->rb_node, &machine->threads);
1486         RB_CLEAR_NODE(&th->rb_node);
1487         --machine->nr_threads;
1488         /*
1489          * Move it first to the dead_threads list, then drop the reference,
1490          * if this is the last reference, then the thread__delete destructor
1491          * will be called and we will remove it from the dead_threads list.
1492          */
1493         list_add_tail(&th->node, &machine->dead_threads);
1494         if (lock)
1495                 pthread_rwlock_unlock(&machine->threads_lock);
1496         thread__put(th);
1497 }
1498
1499 void machine__remove_thread(struct machine *machine, struct thread *th)
1500 {
1501         return __machine__remove_thread(machine, th, true);
1502 }
1503
1504 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1505                                 struct perf_sample *sample)
1506 {
1507         struct thread *thread = machine__find_thread(machine,
1508                                                      event->fork.pid,
1509                                                      event->fork.tid);
1510         struct thread *parent = machine__findnew_thread(machine,
1511                                                         event->fork.ppid,
1512                                                         event->fork.ptid);
1513         int err = 0;
1514
1515         if (dump_trace)
1516                 perf_event__fprintf_task(event, stdout);
1517
1518         /*
1519          * There may be an existing thread that is not actually the parent,
1520          * either because we are processing events out of order, or because the
1521          * (fork) event that would have removed the thread was lost. Assume the
1522          * latter case and continue on as best we can.
1523          */
1524         if (parent->pid_ != (pid_t)event->fork.ppid) {
1525                 dump_printf("removing erroneous parent thread %d/%d\n",
1526                             parent->pid_, parent->tid);
1527                 machine__remove_thread(machine, parent);
1528                 thread__put(parent);
1529                 parent = machine__findnew_thread(machine, event->fork.ppid,
1530                                                  event->fork.ptid);
1531         }
1532
1533         /* if a thread currently exists for the thread id remove it */
1534         if (thread != NULL) {
1535                 machine__remove_thread(machine, thread);
1536                 thread__put(thread);
1537         }
1538
1539         thread = machine__findnew_thread(machine, event->fork.pid,
1540                                          event->fork.tid);
1541
1542         if (thread == NULL || parent == NULL ||
1543             thread__fork(thread, parent, sample->time) < 0) {
1544                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1545                 err = -1;
1546         }
1547         thread__put(thread);
1548         thread__put(parent);
1549
1550         return err;
1551 }
1552
1553 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1554                                 struct perf_sample *sample __maybe_unused)
1555 {
1556         struct thread *thread = machine__find_thread(machine,
1557                                                      event->fork.pid,
1558                                                      event->fork.tid);
1559
1560         if (dump_trace)
1561                 perf_event__fprintf_task(event, stdout);
1562
1563         if (thread != NULL) {
1564                 thread__exited(thread);
1565                 thread__put(thread);
1566         }
1567
1568         return 0;
1569 }
1570
1571 int machine__process_event(struct machine *machine, union perf_event *event,
1572                            struct perf_sample *sample)
1573 {
1574         int ret;
1575
1576         switch (event->header.type) {
1577         case PERF_RECORD_COMM:
1578                 ret = machine__process_comm_event(machine, event, sample); break;
1579         case PERF_RECORD_MMAP:
1580                 ret = machine__process_mmap_event(machine, event, sample); break;
1581         case PERF_RECORD_NAMESPACES:
1582                 ret = machine__process_namespaces_event(machine, event, sample); break;
1583         case PERF_RECORD_MMAP2:
1584                 ret = machine__process_mmap2_event(machine, event, sample); break;
1585         case PERF_RECORD_FORK:
1586                 ret = machine__process_fork_event(machine, event, sample); break;
1587         case PERF_RECORD_EXIT:
1588                 ret = machine__process_exit_event(machine, event, sample); break;
1589         case PERF_RECORD_LOST:
1590                 ret = machine__process_lost_event(machine, event, sample); break;
1591         case PERF_RECORD_AUX:
1592                 ret = machine__process_aux_event(machine, event); break;
1593         case PERF_RECORD_ITRACE_START:
1594                 ret = machine__process_itrace_start_event(machine, event); break;
1595         case PERF_RECORD_LOST_SAMPLES:
1596                 ret = machine__process_lost_samples_event(machine, event, sample); break;
1597         case PERF_RECORD_SWITCH:
1598         case PERF_RECORD_SWITCH_CPU_WIDE:
1599                 ret = machine__process_switch_event(machine, event); break;
1600         default:
1601                 ret = -1;
1602                 break;
1603         }
1604
1605         return ret;
1606 }
1607
1608 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1609 {
1610         if (!regexec(regex, sym->name, 0, NULL, 0))
1611                 return 1;
1612         return 0;
1613 }
1614
1615 static void ip__resolve_ams(struct thread *thread,
1616                             struct addr_map_symbol *ams,
1617                             u64 ip)
1618 {
1619         struct addr_location al;
1620
1621         memset(&al, 0, sizeof(al));
1622         /*
1623          * We cannot use the header.misc hint to determine whether a
1624          * branch stack address is user, kernel, guest, hypervisor.
1625          * Branches may straddle the kernel/user/hypervisor boundaries.
1626          * Thus, we have to try consecutively until we find a match
1627          * or else, the symbol is unknown
1628          */
1629         thread__find_cpumode_addr_location(thread, MAP__FUNCTION, ip, &al);
1630
1631         ams->addr = ip;
1632         ams->al_addr = al.addr;
1633         ams->sym = al.sym;
1634         ams->map = al.map;
1635 }
1636
1637 static void ip__resolve_data(struct thread *thread,
1638                              u8 m, struct addr_map_symbol *ams, u64 addr)
1639 {
1640         struct addr_location al;
1641
1642         memset(&al, 0, sizeof(al));
1643
1644         thread__find_addr_location(thread, m, MAP__VARIABLE, addr, &al);
1645         if (al.map == NULL) {
1646                 /*
1647                  * some shared data regions have execute bit set which puts
1648                  * their mapping in the MAP__FUNCTION type array.
1649                  * Check there as a fallback option before dropping the sample.
1650                  */
1651                 thread__find_addr_location(thread, m, MAP__FUNCTION, addr, &al);
1652         }
1653
1654         ams->addr = addr;
1655         ams->al_addr = al.addr;
1656         ams->sym = al.sym;
1657         ams->map = al.map;
1658 }
1659
1660 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1661                                      struct addr_location *al)
1662 {
1663         struct mem_info *mi = zalloc(sizeof(*mi));
1664
1665         if (!mi)
1666                 return NULL;
1667
1668         ip__resolve_ams(al->thread, &mi->iaddr, sample->ip);
1669         ip__resolve_data(al->thread, al->cpumode, &mi->daddr, sample->addr);
1670         mi->data_src.val = sample->data_src;
1671
1672         return mi;
1673 }
1674
1675 static int add_callchain_ip(struct thread *thread,
1676                             struct callchain_cursor *cursor,
1677                             struct symbol **parent,
1678                             struct addr_location *root_al,
1679                             u8 *cpumode,
1680                             u64 ip,
1681                             bool branch,
1682                             struct branch_flags *flags,
1683                             int nr_loop_iter,
1684                             int samples)
1685 {
1686         struct addr_location al;
1687
1688         al.filtered = 0;
1689         al.sym = NULL;
1690         if (!cpumode) {
1691                 thread__find_cpumode_addr_location(thread, MAP__FUNCTION,
1692                                                    ip, &al);
1693         } else {
1694                 if (ip >= PERF_CONTEXT_MAX) {
1695                         switch (ip) {
1696                         case PERF_CONTEXT_HV:
1697                                 *cpumode = PERF_RECORD_MISC_HYPERVISOR;
1698                                 break;
1699                         case PERF_CONTEXT_KERNEL:
1700                                 *cpumode = PERF_RECORD_MISC_KERNEL;
1701                                 break;
1702                         case PERF_CONTEXT_USER:
1703                                 *cpumode = PERF_RECORD_MISC_USER;
1704                                 break;
1705                         default:
1706                                 pr_debug("invalid callchain context: "
1707                                          "%"PRId64"\n", (s64) ip);
1708                                 /*
1709                                  * It seems the callchain is corrupted.
1710                                  * Discard all.
1711                                  */
1712                                 callchain_cursor_reset(cursor);
1713                                 return 1;
1714                         }
1715                         return 0;
1716                 }
1717                 thread__find_addr_location(thread, *cpumode, MAP__FUNCTION,
1718                                            ip, &al);
1719         }
1720
1721         if (al.sym != NULL) {
1722                 if (perf_hpp_list.parent && !*parent &&
1723                     symbol__match_regex(al.sym, &parent_regex))
1724                         *parent = al.sym;
1725                 else if (have_ignore_callees && root_al &&
1726                   symbol__match_regex(al.sym, &ignore_callees_regex)) {
1727                         /* Treat this symbol as the root,
1728                            forgetting its callees. */
1729                         *root_al = al;
1730                         callchain_cursor_reset(cursor);
1731                 }
1732         }
1733
1734         if (symbol_conf.hide_unresolved && al.sym == NULL)
1735                 return 0;
1736         return callchain_cursor_append(cursor, al.addr, al.map, al.sym,
1737                                        branch, flags, nr_loop_iter, samples);
1738 }
1739
1740 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1741                                            struct addr_location *al)
1742 {
1743         unsigned int i;
1744         const struct branch_stack *bs = sample->branch_stack;
1745         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1746
1747         if (!bi)
1748                 return NULL;
1749
1750         for (i = 0; i < bs->nr; i++) {
1751                 ip__resolve_ams(al->thread, &bi[i].to, bs->entries[i].to);
1752                 ip__resolve_ams(al->thread, &bi[i].from, bs->entries[i].from);
1753                 bi[i].flags = bs->entries[i].flags;
1754         }
1755         return bi;
1756 }
1757
1758 #define CHASHSZ 127
1759 #define CHASHBITS 7
1760 #define NO_ENTRY 0xff
1761
1762 #define PERF_MAX_BRANCH_DEPTH 127
1763
1764 /* Remove loops. */
1765 static int remove_loops(struct branch_entry *l, int nr)
1766 {
1767         int i, j, off;
1768         unsigned char chash[CHASHSZ];
1769
1770         memset(chash, NO_ENTRY, sizeof(chash));
1771
1772         BUG_ON(PERF_MAX_BRANCH_DEPTH > 255);
1773
1774         for (i = 0; i < nr; i++) {
1775                 int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ;
1776
1777                 /* no collision handling for now */
1778                 if (chash[h] == NO_ENTRY) {
1779                         chash[h] = i;
1780                 } else if (l[chash[h]].from == l[i].from) {
1781                         bool is_loop = true;
1782                         /* check if it is a real loop */
1783                         off = 0;
1784                         for (j = chash[h]; j < i && i + off < nr; j++, off++)
1785                                 if (l[j].from != l[i + off].from) {
1786                                         is_loop = false;
1787                                         break;
1788                                 }
1789                         if (is_loop) {
1790                                 memmove(l + i, l + i + off,
1791                                         (nr - (i + off)) * sizeof(*l));
1792                                 nr -= off;
1793                         }
1794                 }
1795         }
1796         return nr;
1797 }
1798
1799 /*
1800  * Recolve LBR callstack chain sample
1801  * Return:
1802  * 1 on success get LBR callchain information
1803  * 0 no available LBR callchain information, should try fp
1804  * negative error code on other errors.
1805  */
1806 static int resolve_lbr_callchain_sample(struct thread *thread,
1807                                         struct callchain_cursor *cursor,
1808                                         struct perf_sample *sample,
1809                                         struct symbol **parent,
1810                                         struct addr_location *root_al,
1811                                         int max_stack)
1812 {
1813         struct ip_callchain *chain = sample->callchain;
1814         int chain_nr = min(max_stack, (int)chain->nr), i;
1815         u8 cpumode = PERF_RECORD_MISC_USER;
1816         u64 ip;
1817
1818         for (i = 0; i < chain_nr; i++) {
1819                 if (chain->ips[i] == PERF_CONTEXT_USER)
1820                         break;
1821         }
1822
1823         /* LBR only affects the user callchain */
1824         if (i != chain_nr) {
1825                 struct branch_stack *lbr_stack = sample->branch_stack;
1826                 int lbr_nr = lbr_stack->nr, j, k;
1827                 bool branch;
1828                 struct branch_flags *flags;
1829                 /*
1830                  * LBR callstack can only get user call chain.
1831                  * The mix_chain_nr is kernel call chain
1832                  * number plus LBR user call chain number.
1833                  * i is kernel call chain number,
1834                  * 1 is PERF_CONTEXT_USER,
1835                  * lbr_nr + 1 is the user call chain number.
1836                  * For details, please refer to the comments
1837                  * in callchain__printf
1838                  */
1839                 int mix_chain_nr = i + 1 + lbr_nr + 1;
1840
1841                 for (j = 0; j < mix_chain_nr; j++) {
1842                         int err;
1843                         branch = false;
1844                         flags = NULL;
1845
1846                         if (callchain_param.order == ORDER_CALLEE) {
1847                                 if (j < i + 1)
1848                                         ip = chain->ips[j];
1849                                 else if (j > i + 1) {
1850                                         k = j - i - 2;
1851                                         ip = lbr_stack->entries[k].from;
1852                                         branch = true;
1853                                         flags = &lbr_stack->entries[k].flags;
1854                                 } else {
1855                                         ip = lbr_stack->entries[0].to;
1856                                         branch = true;
1857                                         flags = &lbr_stack->entries[0].flags;
1858                                 }
1859                         } else {
1860                                 if (j < lbr_nr) {
1861                                         k = lbr_nr - j - 1;
1862                                         ip = lbr_stack->entries[k].from;
1863                                         branch = true;
1864                                         flags = &lbr_stack->entries[k].flags;
1865                                 }
1866                                 else if (j > lbr_nr)
1867                                         ip = chain->ips[i + 1 - (j - lbr_nr)];
1868                                 else {
1869                                         ip = lbr_stack->entries[0].to;
1870                                         branch = true;
1871                                         flags = &lbr_stack->entries[0].flags;
1872                                 }
1873                         }
1874
1875                         err = add_callchain_ip(thread, cursor, parent,
1876                                                root_al, &cpumode, ip,
1877                                                branch, flags, 0, 0);
1878                         if (err)
1879                                 return (err < 0) ? err : 0;
1880                 }
1881                 return 1;
1882         }
1883
1884         return 0;
1885 }
1886
1887 static int thread__resolve_callchain_sample(struct thread *thread,
1888                                             struct callchain_cursor *cursor,
1889                                             struct perf_evsel *evsel,
1890                                             struct perf_sample *sample,
1891                                             struct symbol **parent,
1892                                             struct addr_location *root_al,
1893                                             int max_stack)
1894 {
1895         struct branch_stack *branch = sample->branch_stack;
1896         struct ip_callchain *chain = sample->callchain;
1897         int chain_nr = chain->nr;
1898         u8 cpumode = PERF_RECORD_MISC_USER;
1899         int i, j, err, nr_entries;
1900         int skip_idx = -1;
1901         int first_call = 0;
1902         int nr_loop_iter;
1903
1904         if (perf_evsel__has_branch_callstack(evsel)) {
1905                 err = resolve_lbr_callchain_sample(thread, cursor, sample, parent,
1906                                                    root_al, max_stack);
1907                 if (err)
1908                         return (err < 0) ? err : 0;
1909         }
1910
1911         /*
1912          * Based on DWARF debug information, some architectures skip
1913          * a callchain entry saved by the kernel.
1914          */
1915         skip_idx = arch_skip_callchain_idx(thread, chain);
1916
1917         /*
1918          * Add branches to call stack for easier browsing. This gives
1919          * more context for a sample than just the callers.
1920          *
1921          * This uses individual histograms of paths compared to the
1922          * aggregated histograms the normal LBR mode uses.
1923          *
1924          * Limitations for now:
1925          * - No extra filters
1926          * - No annotations (should annotate somehow)
1927          */
1928
1929         if (branch && callchain_param.branch_callstack) {
1930                 int nr = min(max_stack, (int)branch->nr);
1931                 struct branch_entry be[nr];
1932
1933                 if (branch->nr > PERF_MAX_BRANCH_DEPTH) {
1934                         pr_warning("corrupted branch chain. skipping...\n");
1935                         goto check_calls;
1936                 }
1937
1938                 for (i = 0; i < nr; i++) {
1939                         if (callchain_param.order == ORDER_CALLEE) {
1940                                 be[i] = branch->entries[i];
1941                                 /*
1942                                  * Check for overlap into the callchain.
1943                                  * The return address is one off compared to
1944                                  * the branch entry. To adjust for this
1945                                  * assume the calling instruction is not longer
1946                                  * than 8 bytes.
1947                                  */
1948                                 if (i == skip_idx ||
1949                                     chain->ips[first_call] >= PERF_CONTEXT_MAX)
1950                                         first_call++;
1951                                 else if (be[i].from < chain->ips[first_call] &&
1952                                     be[i].from >= chain->ips[first_call] - 8)
1953                                         first_call++;
1954                         } else
1955                                 be[i] = branch->entries[branch->nr - i - 1];
1956                 }
1957
1958                 nr_loop_iter = nr;
1959                 nr = remove_loops(be, nr);
1960
1961                 /*
1962                  * Get the number of iterations.
1963                  * It's only approximation, but good enough in practice.
1964                  */
1965                 if (nr_loop_iter > nr)
1966                         nr_loop_iter = nr_loop_iter - nr + 1;
1967                 else
1968                         nr_loop_iter = 0;
1969
1970                 for (i = 0; i < nr; i++) {
1971                         if (i == nr - 1)
1972                                 err = add_callchain_ip(thread, cursor, parent,
1973                                                        root_al,
1974                                                        NULL, be[i].to,
1975                                                        true, &be[i].flags,
1976                                                        nr_loop_iter, 1);
1977                         else
1978                                 err = add_callchain_ip(thread, cursor, parent,
1979                                                        root_al,
1980                                                        NULL, be[i].to,
1981                                                        true, &be[i].flags,
1982                                                        0, 0);
1983
1984                         if (!err)
1985                                 err = add_callchain_ip(thread, cursor, parent, root_al,
1986                                                        NULL, be[i].from,
1987                                                        true, &be[i].flags,
1988                                                        0, 0);
1989                         if (err == -EINVAL)
1990                                 break;
1991                         if (err)
1992                                 return err;
1993                 }
1994                 chain_nr -= nr;
1995         }
1996
1997 check_calls:
1998         for (i = first_call, nr_entries = 0;
1999              i < chain_nr && nr_entries < max_stack; i++) {
2000                 u64 ip;
2001
2002                 if (callchain_param.order == ORDER_CALLEE)
2003                         j = i;
2004                 else
2005                         j = chain->nr - i - 1;
2006
2007 #ifdef HAVE_SKIP_CALLCHAIN_IDX
2008                 if (j == skip_idx)
2009                         continue;
2010 #endif
2011                 ip = chain->ips[j];
2012
2013                 if (ip < PERF_CONTEXT_MAX)
2014                        ++nr_entries;
2015
2016                 err = add_callchain_ip(thread, cursor, parent,
2017                                        root_al, &cpumode, ip,
2018                                        false, NULL, 0, 0);
2019
2020                 if (err)
2021                         return (err < 0) ? err : 0;
2022         }
2023
2024         return 0;
2025 }
2026
2027 static int unwind_entry(struct unwind_entry *entry, void *arg)
2028 {
2029         struct callchain_cursor *cursor = arg;
2030
2031         if (symbol_conf.hide_unresolved && entry->sym == NULL)
2032                 return 0;
2033         return callchain_cursor_append(cursor, entry->ip,
2034                                        entry->map, entry->sym,
2035                                        false, NULL, 0, 0);
2036 }
2037
2038 static int thread__resolve_callchain_unwind(struct thread *thread,
2039                                             struct callchain_cursor *cursor,
2040                                             struct perf_evsel *evsel,
2041                                             struct perf_sample *sample,
2042                                             int max_stack)
2043 {
2044         /* Can we do dwarf post unwind? */
2045         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
2046               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
2047                 return 0;
2048
2049         /* Bail out if nothing was captured. */
2050         if ((!sample->user_regs.regs) ||
2051             (!sample->user_stack.size))
2052                 return 0;
2053
2054         return unwind__get_entries(unwind_entry, cursor,
2055                                    thread, sample, max_stack);
2056 }
2057
2058 int thread__resolve_callchain(struct thread *thread,
2059                               struct callchain_cursor *cursor,
2060                               struct perf_evsel *evsel,
2061                               struct perf_sample *sample,
2062                               struct symbol **parent,
2063                               struct addr_location *root_al,
2064                               int max_stack)
2065 {
2066         int ret = 0;
2067
2068         callchain_cursor_reset(&callchain_cursor);
2069
2070         if (callchain_param.order == ORDER_CALLEE) {
2071                 ret = thread__resolve_callchain_sample(thread, cursor,
2072                                                        evsel, sample,
2073                                                        parent, root_al,
2074                                                        max_stack);
2075                 if (ret)
2076                         return ret;
2077                 ret = thread__resolve_callchain_unwind(thread, cursor,
2078                                                        evsel, sample,
2079                                                        max_stack);
2080         } else {
2081                 ret = thread__resolve_callchain_unwind(thread, cursor,
2082                                                        evsel, sample,
2083                                                        max_stack);
2084                 if (ret)
2085                         return ret;
2086                 ret = thread__resolve_callchain_sample(thread, cursor,
2087                                                        evsel, sample,
2088                                                        parent, root_al,
2089                                                        max_stack);
2090         }
2091
2092         return ret;
2093 }
2094
2095 int machine__for_each_thread(struct machine *machine,
2096                              int (*fn)(struct thread *thread, void *p),
2097                              void *priv)
2098 {
2099         struct rb_node *nd;
2100         struct thread *thread;
2101         int rc = 0;
2102
2103         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
2104                 thread = rb_entry(nd, struct thread, rb_node);
2105                 rc = fn(thread, priv);
2106                 if (rc != 0)
2107                         return rc;
2108         }
2109
2110         list_for_each_entry(thread, &machine->dead_threads, node) {
2111                 rc = fn(thread, priv);
2112                 if (rc != 0)
2113                         return rc;
2114         }
2115         return rc;
2116 }
2117
2118 int machines__for_each_thread(struct machines *machines,
2119                               int (*fn)(struct thread *thread, void *p),
2120                               void *priv)
2121 {
2122         struct rb_node *nd;
2123         int rc = 0;
2124
2125         rc = machine__for_each_thread(&machines->host, fn, priv);
2126         if (rc != 0)
2127                 return rc;
2128
2129         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
2130                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
2131
2132                 rc = machine__for_each_thread(machine, fn, priv);
2133                 if (rc != 0)
2134                         return rc;
2135         }
2136         return rc;
2137 }
2138
2139 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
2140                                   struct target *target, struct thread_map *threads,
2141                                   perf_event__handler_t process, bool data_mmap,
2142                                   unsigned int proc_map_timeout)
2143 {
2144         if (target__has_task(target))
2145                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap, proc_map_timeout);
2146         else if (target__has_cpu(target))
2147                 return perf_event__synthesize_threads(tool, process, machine, data_mmap, proc_map_timeout);
2148         /* command specified */
2149         return 0;
2150 }
2151
2152 pid_t machine__get_current_tid(struct machine *machine, int cpu)
2153 {
2154         if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid)
2155                 return -1;
2156
2157         return machine->current_tid[cpu];
2158 }
2159
2160 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
2161                              pid_t tid)
2162 {
2163         struct thread *thread;
2164
2165         if (cpu < 0)
2166                 return -EINVAL;
2167
2168         if (!machine->current_tid) {
2169                 int i;
2170
2171                 machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t));
2172                 if (!machine->current_tid)
2173                         return -ENOMEM;
2174                 for (i = 0; i < MAX_NR_CPUS; i++)
2175                         machine->current_tid[i] = -1;
2176         }
2177
2178         if (cpu >= MAX_NR_CPUS) {
2179                 pr_err("Requested CPU %d too large. ", cpu);
2180                 pr_err("Consider raising MAX_NR_CPUS\n");
2181                 return -EINVAL;
2182         }
2183
2184         machine->current_tid[cpu] = tid;
2185
2186         thread = machine__findnew_thread(machine, pid, tid);
2187         if (!thread)
2188                 return -ENOMEM;
2189
2190         thread->cpu = cpu;
2191         thread__put(thread);
2192
2193         return 0;
2194 }
2195
2196 int machine__get_kernel_start(struct machine *machine)
2197 {
2198         struct map *map = machine__kernel_map(machine);
2199         int err = 0;
2200
2201         /*
2202          * The only addresses above 2^63 are kernel addresses of a 64-bit
2203          * kernel.  Note that addresses are unsigned so that on a 32-bit system
2204          * all addresses including kernel addresses are less than 2^32.  In
2205          * that case (32-bit system), if the kernel mapping is unknown, all
2206          * addresses will be assumed to be in user space - see
2207          * machine__kernel_ip().
2208          */
2209         machine->kernel_start = 1ULL << 63;
2210         if (map) {
2211                 err = map__load(map);
2212                 if (map->start)
2213                         machine->kernel_start = map->start;
2214         }
2215         return err;
2216 }
2217
2218 struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
2219 {
2220         return dsos__findnew(&machine->dsos, filename);
2221 }
2222
2223 char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
2224 {
2225         struct machine *machine = vmachine;
2226         struct map *map;
2227         struct symbol *sym = map_groups__find_symbol(&machine->kmaps, MAP__FUNCTION, *addrp, &map);
2228
2229         if (sym == NULL)
2230                 return NULL;
2231
2232         *modp = __map__is_kmodule(map) ? (char *)map->dso->short_name : NULL;
2233         *addrp = map->unmap_ip(map, sym->start);
2234         return sym->name;
2235 }