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