tools/perf/util/machine.c

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