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 "unwind.h"
  13
  14 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
  15 {
  16         map_groups__init(&machine->kmaps);
  17         RB_CLEAR_NODE(&machine->rb_node);
  18         INIT_LIST_HEAD(&machine->user_dsos);
  19         INIT_LIST_HEAD(&machine->kernel_dsos);
  20
  21         machine->threads = RB_ROOT;
  22         INIT_LIST_HEAD(&machine->dead_threads);
  23         machine->last_match = NULL;
  24
  25         machine->kmaps.machine = machine;
  26         machine->pid = pid;
  27
  28         machine->symbol_filter = NULL;
  29
  30         machine->root_dir = strdup(root_dir);
  31         if (machine->root_dir == NULL)
  32                 return -ENOMEM;
  33
  34         if (pid != HOST_KERNEL_ID) {
  35                 struct thread *thread = machine__findnew_thread(machine, 0,
  36                                                                 pid);
  37                 char comm[64];
  38
  39                 if (thread == NULL)
  40                         return -ENOMEM;
  41
  42                 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
  43                 thread__set_comm(thread, comm, 0);
  44         }
  45
  46         return 0;
  47 }
  48
  49 struct machine *machine__new_host(void)
  50 {
  51         struct machine *machine = malloc(sizeof(*machine));
  52
  53         if (machine != NULL) {
  54                 machine__init(machine, "", HOST_KERNEL_ID);
  55
  56                 if (machine__create_kernel_maps(machine) < 0)
  57                         goto out_delete;
  58         }
  59
  60         return machine;
  61 out_delete:
  62         free(machine);
  63         return NULL;
  64 }
  65
  66 static void dsos__delete(struct list_head *dsos)
  67 {
  68         struct dso *pos, *n;
  69
  70         list_for_each_entry_safe(pos, n, dsos, node) {
  71                 list_del(&pos->node);
  72                 dso__delete(pos);
  73         }
  74 }
  75
  76 void machine__delete_dead_threads(struct machine *machine)
  77 {
  78         struct thread *n, *t;
  79
  80         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
  81                 list_del(&t->node);
  82                 thread__delete(t);
  83         }
  84 }
  85
  86 void machine__delete_threads(struct machine *machine)
  87 {
  88         struct rb_node *nd = rb_first(&machine->threads);
  89
  90         while (nd) {
  91                 struct thread *t = rb_entry(nd, struct thread, rb_node);
  92
  93                 rb_erase(&t->rb_node, &machine->threads);
  94                 nd = rb_next(nd);
  95                 thread__delete(t);
  96         }
  97 }
  98
  99 void machine__exit(struct machine *machine)
 100 {
 101         map_groups__exit(&machine->kmaps);
 102         dsos__delete(&machine->user_dsos);
 103         dsos__delete(&machine->kernel_dsos);
 104         free(machine->root_dir);
 105         machine->root_dir = NULL;
 106 }
 107
 108 void machine__delete(struct machine *machine)
 109 {
 110         machine__exit(machine);
 111         free(machine);
 112 }
 113
 114 void machines__init(struct machines *machines)
 115 {
 116         machine__init(&machines->host, "", HOST_KERNEL_ID);
 117         machines->guests = RB_ROOT;
 118         machines->symbol_filter = NULL;
 119 }
 120
 121 void machines__exit(struct machines *machines)
 122 {
 123         machine__exit(&machines->host);
 124         /* XXX exit guest */
 125 }
 126
 127 struct machine *machines__add(struct machines *machines, pid_t pid,
 128                               const char *root_dir)
 129 {
 130         struct rb_node **p = &machines->guests.rb_node;
 131         struct rb_node *parent = NULL;
 132         struct machine *pos, *machine = malloc(sizeof(*machine));
 133
 134         if (machine == NULL)
 135                 return NULL;
 136
 137         if (machine__init(machine, root_dir, pid) != 0) {
 138                 free(machine);
 139                 return NULL;
 140         }
 141
 142         machine->symbol_filter = machines->symbol_filter;
 143
 144         while (*p != NULL) {
 145                 parent = *p;
 146                 pos = rb_entry(parent, struct machine, rb_node);
 147                 if (pid < pos->pid)
 148                         p = &(*p)->rb_left;
 149                 else
 150                         p = &(*p)->rb_right;
 151         }
 152
 153         rb_link_node(&machine->rb_node, parent, p);
 154         rb_insert_color(&machine->rb_node, &machines->guests);
 155
 156         return machine;
 157 }
 158
 159 void machines__set_symbol_filter(struct machines *machines,
 160                                  symbol_filter_t symbol_filter)
 161 {
 162         struct rb_node *nd;
 163
 164         machines->symbol_filter = symbol_filter;
 165         machines->host.symbol_filter = symbol_filter;
 166
 167         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 168                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
 169
 170                 machine->symbol_filter = symbol_filter;
 171         }
 172 }
 173
 174 struct machine *machines__find(struct machines *machines, pid_t pid)
 175 {
 176         struct rb_node **p = &machines->guests.rb_node;
 177         struct rb_node *parent = NULL;
 178         struct machine *machine;
 179         struct machine *default_machine = NULL;
 180
 181         if (pid == HOST_KERNEL_ID)
 182                 return &machines->host;
 183
 184         while (*p != NULL) {
 185                 parent = *p;
 186                 machine = rb_entry(parent, struct machine, rb_node);
 187                 if (pid < machine->pid)
 188                         p = &(*p)->rb_left;
 189                 else if (pid > machine->pid)
 190                         p = &(*p)->rb_right;
 191                 else
 192                         return machine;
 193                 if (!machine->pid)
 194                         default_machine = machine;
 195         }
 196
 197         return default_machine;
 198 }
 199
 200 struct machine *machines__findnew(struct machines *machines, pid_t pid)
 201 {
 202         char path[PATH_MAX];
 203         const char *root_dir = "";
 204         struct machine *machine = machines__find(machines, pid);
 205
 206         if (machine && (machine->pid == pid))
 207                 goto out;
 208
 209         if ((pid != HOST_KERNEL_ID) &&
 210             (pid != DEFAULT_GUEST_KERNEL_ID) &&
 211             (symbol_conf.guestmount)) {
 212                 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 213                 if (access(path, R_OK)) {
 214                         static struct strlist *seen;
 215
 216                         if (!seen)
 217                                 seen = strlist__new(true, NULL);
 218
 219                         if (!strlist__has_entry(seen, path)) {
 220                                 pr_err("Can't access file %s\n", path);
 221                                 strlist__add(seen, path);
 222                         }
 223                         machine = NULL;
 224                         goto out;
 225                 }
 226                 root_dir = path;
 227         }
 228
 229         machine = machines__add(machines, pid, root_dir);
 230 out:
 231         return machine;
 232 }
 233
 234 void machines__process_guests(struct machines *machines,
 235                               machine__process_t process, void *data)
 236 {
 237         struct rb_node *nd;
 238
 239         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 240                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 241                 process(pos, data);
 242         }
 243 }
 244
 245 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 246 {
 247         if (machine__is_host(machine))
 248                 snprintf(bf, size, "[%s]", "kernel.kallsyms");
 249         else if (machine__is_default_guest(machine))
 250                 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 251         else {
 252                 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
 253                          machine->pid);
 254         }
 255
 256         return bf;
 257 }
 258
 259 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 260 {
 261         struct rb_node *node;
 262         struct machine *machine;
 263
 264         machines->host.id_hdr_size = id_hdr_size;
 265
 266         for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 267                 machine = rb_entry(node, struct machine, rb_node);
 268                 machine->id_hdr_size = id_hdr_size;
 269         }
 270
 271         return;
 272 }
 273
 274 static struct thread *__machine__findnew_thread(struct machine *machine,
 275                                                 pid_t pid, pid_t tid,
 276                                                 bool create)
 277 {
 278         struct rb_node **p = &machine->threads.rb_node;
 279         struct rb_node *parent = NULL;
 280         struct thread *th;
 281
 282         /*
 283          * Front-end cache - TID lookups come in blocks,
 284          * so most of the time we dont have to look up
 285          * the full rbtree:
 286          */
 287         if (machine->last_match && machine->last_match->tid == tid) {
 288                 if (pid && pid != machine->last_match->pid_)
 289                         machine->last_match->pid_ = pid;
 290                 return machine->last_match;
 291         }
 292
 293         while (*p != NULL) {
 294                 parent = *p;
 295                 th = rb_entry(parent, struct thread, rb_node);
 296
 297                 if (th->tid == tid) {
 298                         machine->last_match = th;
 299                         if (pid && pid != th->pid_)
 300                                 th->pid_ = pid;
 301                         return th;
 302                 }
 303
 304                 if (tid < th->tid)
 305                         p = &(*p)->rb_left;
 306                 else
 307                         p = &(*p)->rb_right;
 308         }
 309
 310         if (!create)
 311                 return NULL;
 312
 313         th = thread__new(pid, tid);
 314         if (th != NULL) {
 315                 rb_link_node(&th->rb_node, parent, p);
 316                 rb_insert_color(&th->rb_node, &machine->threads);
 317                 machine->last_match = th;
 318         }
 319
 320         return th;
 321 }
 322
 323 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
 324                                        pid_t tid)
 325 {
 326         return __machine__findnew_thread(machine, pid, tid, true);
 327 }
 328
 329 struct thread *machine__find_thread(struct machine *machine, pid_t tid)
 330 {
 331         return __machine__findnew_thread(machine, 0, tid, false);
 332 }
 333
 334 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 335                                 struct perf_sample *sample)
 336 {
 337         struct thread *thread = machine__findnew_thread(machine,
 338                                                         event->comm.pid,
 339                                                         event->comm.tid);
 340
 341         if (dump_trace)
 342                 perf_event__fprintf_comm(event, stdout);
 343
 344         if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
 345                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 346                 return -1;
 347         }
 348
 349         return 0;
 350 }
 351
 352 int machine__process_lost_event(struct machine *machine __maybe_unused,
 353                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 354 {
 355         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 356                     event->lost.id, event->lost.lost);
 357         return 0;
 358 }
 359
 360 struct map *machine__new_module(struct machine *machine, u64 start,
 361                                 const char *filename)
 362 {
 363         struct map *map;
 364         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 365
 366         if (dso == NULL)
 367                 return NULL;
 368
 369         map = map__new2(start, dso, MAP__FUNCTION);
 370         if (map == NULL)
 371                 return NULL;
 372
 373         if (machine__is_host(machine))
 374                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 375         else
 376                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 377         map_groups__insert(&machine->kmaps, map);
 378         return map;
 379 }
 380
 381 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 382 {
 383         struct rb_node *nd;
 384         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 385                      __dsos__fprintf(&machines->host.user_dsos, fp);
 386
 387         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 388                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 389                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 390                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 391         }
 392
 393         return ret;
 394 }
 395
 396 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 397                                      bool (skip)(struct dso *dso, int parm), int parm)
 398 {
 399         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 400                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 401 }
 402
 403 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 404                                      bool (skip)(struct dso *dso, int parm), int parm)
 405 {
 406         struct rb_node *nd;
 407         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 408
 409         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 410                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 411                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 412         }
 413         return ret;
 414 }
 415
 416 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 417 {
 418         int i;
 419         size_t printed = 0;
 420         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 421
 422         if (kdso->has_build_id) {
 423                 char filename[PATH_MAX];
 424                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 425                         printed += fprintf(fp, "[0] %s\n", filename);
 426         }
 427
 428         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 429                 printed += fprintf(fp, "[%d] %s\n",
 430                                    i + kdso->has_build_id, vmlinux_path[i]);
 431
 432         return printed;
 433 }
 434
 435 size_t machine__fprintf(struct machine *machine, FILE *fp)
 436 {
 437         size_t ret = 0;
 438         struct rb_node *nd;
 439
 440         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 441                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 442
 443                 ret += thread__fprintf(pos, fp);
 444         }
 445
 446         return ret;
 447 }
 448
 449 static struct dso *machine__get_kernel(struct machine *machine)
 450 {
 451         const char *vmlinux_name = NULL;
 452         struct dso *kernel;
 453
 454         if (machine__is_host(machine)) {
 455                 vmlinux_name = symbol_conf.vmlinux_name;
 456                 if (!vmlinux_name)
 457                         vmlinux_name = "[kernel.kallsyms]";
 458
 459                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 460                                              "[kernel]",
 461                                              DSO_TYPE_KERNEL);
 462         } else {
 463                 char bf[PATH_MAX];
 464
 465                 if (machine__is_default_guest(machine))
 466                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 467                 if (!vmlinux_name)
 468                         vmlinux_name = machine__mmap_name(machine, bf,
 469                                                           sizeof(bf));
 470
 471                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 472                                              "[guest.kernel]",
 473                                              DSO_TYPE_GUEST_KERNEL);
 474         }
 475
 476         if (kernel != NULL && (!kernel->has_build_id))
 477                 dso__read_running_kernel_build_id(kernel, machine);
 478
 479         return kernel;
 480 }
 481
 482 struct process_args {
 483         u64 start;
 484 };
 485
 486 static int symbol__in_kernel(void *arg, const char *name,
 487                              char type __maybe_unused, u64 start)
 488 {
 489         struct process_args *args = arg;
 490
 491         if (strchr(name, '['))
 492                 return 0;
 493
 494         args->start = start;
 495         return 1;
 496 }
 497
 498 /* Figure out the start address of kernel map from /proc/kallsyms */
 499 static u64 machine__get_kernel_start_addr(struct machine *machine)
 500 {
 501         const char *filename;
 502         char path[PATH_MAX];
 503         struct process_args args;
 504
 505         if (machine__is_host(machine)) {
 506                 filename = "/proc/kallsyms";
 507         } else {
 508                 if (machine__is_default_guest(machine))
 509                         filename = (char *)symbol_conf.default_guest_kallsyms;
 510                 else {
 511                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 512                         filename = path;
 513                 }
 514         }
 515
 516         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 517                 return 0;
 518
 519         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
 520                 return 0;
 521
 522         return args.start;
 523 }
 524
 525 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 526 {
 527         enum map_type type;
 528         u64 start = machine__get_kernel_start_addr(machine);
 529
 530         for (type = 0; type < MAP__NR_TYPES; ++type) {
 531                 struct kmap *kmap;
 532
 533                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 534                 if (machine->vmlinux_maps[type] == NULL)
 535                         return -1;
 536
 537                 machine->vmlinux_maps[type]->map_ip =
 538                         machine->vmlinux_maps[type]->unmap_ip =
 539                                 identity__map_ip;
 540                 kmap = map__kmap(machine->vmlinux_maps[type]);
 541                 kmap->kmaps = &machine->kmaps;
 542                 map_groups__insert(&machine->kmaps,
 543                                    machine->vmlinux_maps[type]);
 544         }
 545
 546         return 0;
 547 }
 548
 549 void machine__destroy_kernel_maps(struct machine *machine)
 550 {
 551         enum map_type type;
 552
 553         for (type = 0; type < MAP__NR_TYPES; ++type) {
 554                 struct kmap *kmap;
 555
 556                 if (machine->vmlinux_maps[type] == NULL)
 557                         continue;
 558
 559                 kmap = map__kmap(machine->vmlinux_maps[type]);
 560                 map_groups__remove(&machine->kmaps,
 561                                    machine->vmlinux_maps[type]);
 562                 if (kmap->ref_reloc_sym) {
 563                         /*
 564                          * ref_reloc_sym is shared among all maps, so free just
 565                          * on one of them.
 566                          */
 567                         if (type == MAP__FUNCTION) {
 568                                 free((char *)kmap->ref_reloc_sym->name);
 569                                 kmap->ref_reloc_sym->name = NULL;
 570                                 free(kmap->ref_reloc_sym);
 571                         }
 572                         kmap->ref_reloc_sym = NULL;
 573                 }
 574
 575                 map__delete(machine->vmlinux_maps[type]);
 576                 machine->vmlinux_maps[type] = NULL;
 577         }
 578 }
 579
 580 int machines__create_guest_kernel_maps(struct machines *machines)
 581 {
 582         int ret = 0;
 583         struct dirent **namelist = NULL;
 584         int i, items = 0;
 585         char path[PATH_MAX];
 586         pid_t pid;
 587         char *endp;
 588
 589         if (symbol_conf.default_guest_vmlinux_name ||
 590             symbol_conf.default_guest_modules ||
 591             symbol_conf.default_guest_kallsyms) {
 592                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 593         }
 594
 595         if (symbol_conf.guestmount) {
 596                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 597                 if (items <= 0)
 598                         return -ENOENT;
 599                 for (i = 0; i < items; i++) {
 600                         if (!isdigit(namelist[i]->d_name[0])) {
 601                                 /* Filter out . and .. */
 602                                 continue;
 603                         }
 604                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 605                         if ((*endp != '\0') ||
 606                             (endp == namelist[i]->d_name) ||
 607                             (errno == ERANGE)) {
 608                                 pr_debug("invalid directory (%s). Skipping.\n",
 609                                          namelist[i]->d_name);
 610                                 continue;
 611                         }
 612                         sprintf(path, "%s/%s/proc/kallsyms",
 613                                 symbol_conf.guestmount,
 614                                 namelist[i]->d_name);
 615                         ret = access(path, R_OK);
 616                         if (ret) {
 617                                 pr_debug("Can't access file %s\n", path);
 618                                 goto failure;
 619                         }
 620                         machines__create_kernel_maps(machines, pid);
 621                 }
 622 failure:
 623                 free(namelist);
 624         }
 625
 626         return ret;
 627 }
 628
 629 void machines__destroy_kernel_maps(struct machines *machines)
 630 {
 631         struct rb_node *next = rb_first(&machines->guests);
 632
 633         machine__destroy_kernel_maps(&machines->host);
 634
 635         while (next) {
 636                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 637
 638                 next = rb_next(&pos->rb_node);
 639                 rb_erase(&pos->rb_node, &machines->guests);
 640                 machine__delete(pos);
 641         }
 642 }
 643
 644 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 645 {
 646         struct machine *machine = machines__findnew(machines, pid);
 647
 648         if (machine == NULL)
 649                 return -1;
 650
 651         return machine__create_kernel_maps(machine);
 652 }
 653
 654 int machine__load_kallsyms(struct machine *machine, const char *filename,
 655                            enum map_type type, symbol_filter_t filter)
 656 {
 657         struct map *map = machine->vmlinux_maps[type];
 658         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 659
 660         if (ret > 0) {
 661                 dso__set_loaded(map->dso, type);
 662                 /*
 663                  * Since /proc/kallsyms will have multiple sessions for the
 664                  * kernel, with modules between them, fixup the end of all
 665                  * sections.
 666                  */
 667                 __map_groups__fixup_end(&machine->kmaps, type);
 668         }
 669
 670         return ret;
 671 }
 672
 673 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 674                                symbol_filter_t filter)
 675 {
 676         struct map *map = machine->vmlinux_maps[type];
 677         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 678
 679         if (ret > 0)
 680                 dso__set_loaded(map->dso, type);
 681
 682         return ret;
 683 }
 684
 685 static void map_groups__fixup_end(struct map_groups *mg)
 686 {
 687         int i;
 688         for (i = 0; i < MAP__NR_TYPES; ++i)
 689                 __map_groups__fixup_end(mg, i);
 690 }
 691
 692 static char *get_kernel_version(const char *root_dir)
 693 {
 694         char version[PATH_MAX];
 695         FILE *file;
 696         char *name, *tmp;
 697         const char *prefix = "Linux version ";
 698
 699         sprintf(version, "%s/proc/version", root_dir);
 700         file = fopen(version, "r");
 701         if (!file)
 702                 return NULL;
 703
 704         version[0] = '\0';
 705         tmp = fgets(version, sizeof(version), file);
 706         fclose(file);
 707
 708         name = strstr(version, prefix);
 709         if (!name)
 710                 return NULL;
 711         name += strlen(prefix);
 712         tmp = strchr(name, ' ');
 713         if (tmp)
 714                 *tmp = '\0';
 715
 716         return strdup(name);
 717 }
 718
 719 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 720                                 const char *dir_name)
 721 {
 722         struct dirent *dent;
 723         DIR *dir = opendir(dir_name);
 724         int ret = 0;
 725
 726         if (!dir) {
 727                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 728                 return -1;
 729         }
 730
 731         while ((dent = readdir(dir)) != NULL) {
 732                 char path[PATH_MAX];
 733                 struct stat st;
 734
 735                 /*sshfs might return bad dent->d_type, so we have to stat*/
 736                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 737                 if (stat(path, &st))
 738                         continue;
 739
 740                 if (S_ISDIR(st.st_mode)) {
 741                         if (!strcmp(dent->d_name, ".") ||
 742                             !strcmp(dent->d_name, ".."))
 743                                 continue;
 744
 745                         ret = map_groups__set_modules_path_dir(mg, path);
 746                         if (ret < 0)
 747                                 goto out;
 748                 } else {
 749                         char *dot = strrchr(dent->d_name, '.'),
 750                              dso_name[PATH_MAX];
 751                         struct map *map;
 752                         char *long_name;
 753
 754                         if (dot == NULL || strcmp(dot, ".ko"))
 755                                 continue;
 756                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 757                                  (int)(dot - dent->d_name), dent->d_name);
 758
 759                         strxfrchar(dso_name, '-', '_');
 760                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 761                                                        dso_name);
 762                         if (map == NULL)
 763                                 continue;
 764
 765                         long_name = strdup(path);
 766                         if (long_name == NULL) {
 767                                 ret = -1;
 768                                 goto out;
 769                         }
 770                         dso__set_long_name(map->dso, long_name);
 771                         map->dso->lname_alloc = 1;
 772                         dso__kernel_module_get_build_id(map->dso, "");
 773                 }
 774         }
 775
 776 out:
 777         closedir(dir);
 778         return ret;
 779 }
 780
 781 static int machine__set_modules_path(struct machine *machine)
 782 {
 783         char *version;
 784         char modules_path[PATH_MAX];
 785
 786         version = get_kernel_version(machine->root_dir);
 787         if (!version)
 788                 return -1;
 789
 790         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
 791                  machine->root_dir, version);
 792         free(version);
 793
 794         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
 795 }
 796
 797 static int machine__create_module(void *arg, const char *name, u64 start)
 798 {
 799         struct machine *machine = arg;
 800         struct map *map;
 801
 802         map = machine__new_module(machine, start, name);
 803         if (map == NULL)
 804                 return -1;
 805
 806         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 807
 808         return 0;
 809 }
 810
 811 static int machine__create_modules(struct machine *machine)
 812 {
 813         const char *modules;
 814         char path[PATH_MAX];
 815
 816         if (machine__is_default_guest(machine)) {
 817                 modules = symbol_conf.default_guest_modules;
 818         } else {
 819                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 820                 modules = path;
 821         }
 822
 823         if (symbol__restricted_filename(modules, "/proc/modules"))
 824                 return -1;
 825
 826         if (modules__parse(modules, machine, machine__create_module))
 827                 return -1;
 828
 829         if (!machine__set_modules_path(machine))
 830                 return 0;
 831
 832         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 833
 834         return 0;
 835 }
 836
 837 int machine__create_kernel_maps(struct machine *machine)
 838 {
 839         struct dso *kernel = machine__get_kernel(machine);
 840
 841         if (kernel == NULL ||
 842             __machine__create_kernel_maps(machine, kernel) < 0)
 843                 return -1;
 844
 845         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 846                 if (machine__is_host(machine))
 847                         pr_debug("Problems creating module maps, "
 848                                  "continuing anyway...\n");
 849                 else
 850                         pr_debug("Problems creating module maps for guest %d, "
 851                                  "continuing anyway...\n", machine->pid);
 852         }
 853
 854         /*
 855          * Now that we have all the maps created, just set the ->end of them:
 856          */
 857         map_groups__fixup_end(&machine->kmaps);
 858         return 0;
 859 }
 860
 861 static void machine__set_kernel_mmap_len(struct machine *machine,
 862                                          union perf_event *event)
 863 {
 864         int i;
 865
 866         for (i = 0; i < MAP__NR_TYPES; i++) {
 867                 machine->vmlinux_maps[i]->start = event->mmap.start;
 868                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 869                                                    event->mmap.len);
 870                 /*
 871                  * Be a bit paranoid here, some perf.data file came with
 872                  * a zero sized synthesized MMAP event for the kernel.
 873                  */
 874                 if (machine->vmlinux_maps[i]->end == 0)
 875                         machine->vmlinux_maps[i]->end = ~0ULL;
 876         }
 877 }
 878
 879 static bool machine__uses_kcore(struct machine *machine)
 880 {
 881         struct dso *dso;
 882
 883         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 884                 if (dso__is_kcore(dso))
 885                         return true;
 886         }
 887
 888         return false;
 889 }
 890
 891 static int machine__process_kernel_mmap_event(struct machine *machine,
 892                                               union perf_event *event)
 893 {
 894         struct map *map;
 895         char kmmap_prefix[PATH_MAX];
 896         enum dso_kernel_type kernel_type;
 897         bool is_kernel_mmap;
 898
 899         /* If we have maps from kcore then we do not need or want any others */
 900         if (machine__uses_kcore(machine))
 901                 return 0;
 902
 903         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 904         if (machine__is_host(machine))
 905                 kernel_type = DSO_TYPE_KERNEL;
 906         else
 907                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 908
 909         is_kernel_mmap = memcmp(event->mmap.filename,
 910                                 kmmap_prefix,
 911                                 strlen(kmmap_prefix) - 1) == 0;
 912         if (event->mmap.filename[0] == '/' ||
 913             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 914
 915                 char short_module_name[1024];
 916                 char *name, *dot;
 917
 918                 if (event->mmap.filename[0] == '/') {
 919                         name = strrchr(event->mmap.filename, '/');
 920                         if (name == NULL)
 921                                 goto out_problem;
 922
 923                         ++name; /* skip / */
 924                         dot = strrchr(name, '.');
 925                         if (dot == NULL)
 926                                 goto out_problem;
 927                         snprintf(short_module_name, sizeof(short_module_name),
 928                                         "[%.*s]", (int)(dot - name), name);
 929                         strxfrchar(short_module_name, '-', '_');
 930                 } else
 931                         strcpy(short_module_name, event->mmap.filename);
 932
 933                 map = machine__new_module(machine, event->mmap.start,
 934                                           event->mmap.filename);
 935                 if (map == NULL)
 936                         goto out_problem;
 937
 938                 name = strdup(short_module_name);
 939                 if (name == NULL)
 940                         goto out_problem;
 941
 942                 map->dso->short_name = name;
 943                 map->dso->sname_alloc = 1;
 944                 map->end = map->start + event->mmap.len;
 945         } else if (is_kernel_mmap) {
 946                 const char *symbol_name = (event->mmap.filename +
 947                                 strlen(kmmap_prefix));
 948                 /*
 949                  * Should be there already, from the build-id table in
 950                  * the header.
 951                  */
 952                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 953                                                      kmmap_prefix);
 954                 if (kernel == NULL)
 955                         goto out_problem;
 956
 957                 kernel->kernel = kernel_type;
 958                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 959                         goto out_problem;
 960
 961                 machine__set_kernel_mmap_len(machine, event);
 962
 963                 /*
 964                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 965                  * symbol. Effectively having zero here means that at record
 966                  * time /proc/sys/kernel/kptr_restrict was non zero.
 967                  */
 968                 if (event->mmap.pgoff != 0) {
 969                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 970                                                          symbol_name,
 971                                                          event->mmap.pgoff);
 972                 }
 973
 974                 if (machine__is_default_guest(machine)) {
 975                         /*
 976                          * preload dso of guest kernel and modules
 977                          */
 978                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
 979                                   NULL);
 980                 }
 981         }
 982         return 0;
 983 out_problem:
 984         return -1;
 985 }
 986
 987 int machine__process_mmap2_event(struct machine *machine,
 988                                  union perf_event *event,
 989                                  struct perf_sample *sample __maybe_unused)
 990 {
 991         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 992         struct thread *thread;
 993         struct map *map;
 994         enum map_type type;
 995         int ret = 0;
 996
 997         if (dump_trace)
 998                 perf_event__fprintf_mmap2(event, stdout);
 999
1000         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1001             cpumode == PERF_RECORD_MISC_KERNEL) {
1002                 ret = machine__process_kernel_mmap_event(machine, event);
1003                 if (ret < 0)
1004                         goto out_problem;
1005                 return 0;
1006         }
1007
1008         thread = machine__findnew_thread(machine, event->mmap2.pid,
1009                                         event->mmap2.pid);
1010         if (thread == NULL)
1011                 goto out_problem;
1012
1013         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1014                 type = MAP__VARIABLE;
1015         else
1016                 type = MAP__FUNCTION;
1017
1018         map = map__new(&machine->user_dsos, event->mmap2.start,
1019                         event->mmap2.len, event->mmap2.pgoff,
1020                         event->mmap2.pid, event->mmap2.maj,
1021                         event->mmap2.min, event->mmap2.ino,
1022                         event->mmap2.ino_generation,
1023                         event->mmap2.filename, type);
1024
1025         if (map == NULL)
1026                 goto out_problem;
1027
1028         thread__insert_map(thread, map);
1029         return 0;
1030
1031 out_problem:
1032         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1033         return 0;
1034 }
1035
1036 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1037                                 struct perf_sample *sample __maybe_unused)
1038 {
1039         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1040         struct thread *thread;
1041         struct map *map;
1042         enum map_type type;
1043         int ret = 0;
1044
1045         if (dump_trace)
1046                 perf_event__fprintf_mmap(event, stdout);
1047
1048         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1049             cpumode == PERF_RECORD_MISC_KERNEL) {
1050                 ret = machine__process_kernel_mmap_event(machine, event);
1051                 if (ret < 0)
1052                         goto out_problem;
1053                 return 0;
1054         }
1055
1056         thread = machine__findnew_thread(machine, event->mmap.pid,
1057                                          event->mmap.pid);
1058         if (thread == NULL)
1059                 goto out_problem;
1060
1061         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1062                 type = MAP__VARIABLE;
1063         else
1064                 type = MAP__FUNCTION;
1065
1066         map = map__new(&machine->user_dsos, event->mmap.start,
1067                         event->mmap.len, event->mmap.pgoff,
1068                         event->mmap.pid, 0, 0, 0, 0,
1069                         event->mmap.filename,
1070                         type);
1071
1072         if (map == NULL)
1073                 goto out_problem;
1074
1075         thread__insert_map(thread, map);
1076         return 0;
1077
1078 out_problem:
1079         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1080         return 0;
1081 }
1082
1083 static void machine__remove_thread(struct machine *machine, struct thread *th)
1084 {
1085         machine->last_match = NULL;
1086         rb_erase(&th->rb_node, &machine->threads);
1087         /*
1088          * We may have references to this thread, for instance in some hist_entry
1089          * instances, so just move them to a separate list.
1090          */
1091         list_add_tail(&th->node, &machine->dead_threads);
1092 }
1093
1094 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1095                                 struct perf_sample *sample)
1096 {
1097         struct thread *thread = machine__find_thread(machine, event->fork.tid);
1098         struct thread *parent = machine__findnew_thread(machine,
1099                                                         event->fork.ppid,
1100                                                         event->fork.ptid);
1101
1102         /* if a thread currently exists for the thread id remove it */
1103         if (thread != NULL)
1104                 machine__remove_thread(machine, thread);
1105
1106         thread = machine__findnew_thread(machine, event->fork.pid,
1107                                          event->fork.tid);
1108         if (dump_trace)
1109                 perf_event__fprintf_task(event, stdout);
1110
1111         if (thread == NULL || parent == NULL ||
1112             thread__fork(thread, parent, sample->time) < 0) {
1113                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1114                 return -1;
1115         }
1116
1117         return 0;
1118 }
1119
1120 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1121                                 struct perf_sample *sample __maybe_unused)
1122 {
1123         struct thread *thread = machine__find_thread(machine, event->fork.tid);
1124
1125         if (dump_trace)
1126                 perf_event__fprintf_task(event, stdout);
1127
1128         if (thread != NULL)
1129                 thread__exited(thread);
1130
1131         return 0;
1132 }
1133
1134 int machine__process_event(struct machine *machine, union perf_event *event,
1135                            struct perf_sample *sample)
1136 {
1137         int ret;
1138
1139         switch (event->header.type) {
1140         case PERF_RECORD_COMM:
1141                 ret = machine__process_comm_event(machine, event, sample); break;
1142         case PERF_RECORD_MMAP:
1143                 ret = machine__process_mmap_event(machine, event, sample); break;
1144         case PERF_RECORD_MMAP2:
1145                 ret = machine__process_mmap2_event(machine, event, sample); break;
1146         case PERF_RECORD_FORK:
1147                 ret = machine__process_fork_event(machine, event, sample); break;
1148         case PERF_RECORD_EXIT:
1149                 ret = machine__process_exit_event(machine, event, sample); break;
1150         case PERF_RECORD_LOST:
1151                 ret = machine__process_lost_event(machine, event, sample); break;
1152         default:
1153                 ret = -1;
1154                 break;
1155         }
1156
1157         return ret;
1158 }
1159
1160 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1161 {
1162         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1163                 return 1;
1164         return 0;
1165 }
1166
1167 static const u8 cpumodes[] = {
1168         PERF_RECORD_MISC_USER,
1169         PERF_RECORD_MISC_KERNEL,
1170         PERF_RECORD_MISC_GUEST_USER,
1171         PERF_RECORD_MISC_GUEST_KERNEL
1172 };
1173 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
1174
1175 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1176                             struct addr_map_symbol *ams,
1177                             u64 ip)
1178 {
1179         struct addr_location al;
1180         size_t i;
1181         u8 m;
1182
1183         memset(&al, 0, sizeof(al));
1184
1185         for (i = 0; i < NCPUMODES; i++) {
1186                 m = cpumodes[i];
1187                 /*
1188                  * We cannot use the header.misc hint to determine whether a
1189                  * branch stack address is user, kernel, guest, hypervisor.
1190                  * Branches may straddle the kernel/user/hypervisor boundaries.
1191                  * Thus, we have to try consecutively until we find a match
1192                  * or else, the symbol is unknown
1193                  */
1194                 thread__find_addr_location(thread, machine, m, MAP__FUNCTION,
1195                                 ip, &al);
1196                 if (al.sym)
1197                         goto found;
1198         }
1199 found:
1200         ams->addr = ip;
1201         ams->al_addr = al.addr;
1202         ams->sym = al.sym;
1203         ams->map = al.map;
1204 }
1205
1206 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1207                              u8 m, struct addr_map_symbol *ams, u64 addr)
1208 {
1209         struct addr_location al;
1210
1211         memset(&al, 0, sizeof(al));
1212
1213         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1214                                    &al);
1215         ams->addr = addr;
1216         ams->al_addr = al.addr;
1217         ams->sym = al.sym;
1218         ams->map = al.map;
1219 }
1220
1221 struct mem_info *machine__resolve_mem(struct machine *machine,
1222                                       struct thread *thr,
1223                                       struct perf_sample *sample,
1224                                       u8 cpumode)
1225 {
1226         struct mem_info *mi = zalloc(sizeof(*mi));
1227
1228         if (!mi)
1229                 return NULL;
1230
1231         ip__resolve_ams(machine, thr, &mi->iaddr, sample->ip);
1232         ip__resolve_data(machine, thr, cpumode, &mi->daddr, sample->addr);
1233         mi->data_src.val = sample->data_src;
1234
1235         return mi;
1236 }
1237
1238 struct branch_info *machine__resolve_bstack(struct machine *machine,
1239                                             struct thread *thr,
1240                                             struct branch_stack *bs)
1241 {
1242         struct branch_info *bi;
1243         unsigned int i;
1244
1245         bi = calloc(bs->nr, sizeof(struct branch_info));
1246         if (!bi)
1247                 return NULL;
1248
1249         for (i = 0; i < bs->nr; i++) {
1250                 ip__resolve_ams(machine, thr, &bi[i].to, bs->entries[i].to);
1251                 ip__resolve_ams(machine, thr, &bi[i].from, bs->entries[i].from);
1252                 bi[i].flags = bs->entries[i].flags;
1253         }
1254         return bi;
1255 }
1256
1257 static int machine__resolve_callchain_sample(struct machine *machine,
1258                                              struct thread *thread,
1259                                              struct ip_callchain *chain,
1260                                              struct symbol **parent,
1261                                              struct addr_location *root_al,
1262                                              int max_stack)
1263 {
1264         u8 cpumode = PERF_RECORD_MISC_USER;
1265         int chain_nr = min(max_stack, (int)chain->nr);
1266         int i;
1267         int err;
1268
1269         callchain_cursor_reset(&callchain_cursor);
1270
1271         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1272                 pr_warning("corrupted callchain. skipping...\n");
1273                 return 0;
1274         }
1275
1276         for (i = 0; i < chain_nr; i++) {
1277                 u64 ip;
1278                 struct addr_location al;
1279
1280                 if (callchain_param.order == ORDER_CALLEE)
1281                         ip = chain->ips[i];
1282                 else
1283                         ip = chain->ips[chain->nr - i - 1];
1284
1285                 if (ip >= PERF_CONTEXT_MAX) {
1286                         switch (ip) {
1287                         case PERF_CONTEXT_HV:
1288                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1289                                 break;
1290                         case PERF_CONTEXT_KERNEL:
1291                                 cpumode = PERF_RECORD_MISC_KERNEL;
1292                                 break;
1293                         case PERF_CONTEXT_USER:
1294                                 cpumode = PERF_RECORD_MISC_USER;
1295                                 break;
1296                         default:
1297                                 pr_debug("invalid callchain context: "
1298                                          "%"PRId64"\n", (s64) ip);
1299                                 /*
1300                                  * It seems the callchain is corrupted.
1301                                  * Discard all.
1302                                  */
1303                                 callchain_cursor_reset(&callchain_cursor);
1304                                 return 0;
1305                         }
1306                         continue;
1307                 }
1308
1309                 al.filtered = false;
1310                 thread__find_addr_location(thread, machine, cpumode,
1311                                            MAP__FUNCTION, ip, &al);
1312                 if (al.sym != NULL) {
1313                         if (sort__has_parent && !*parent &&
1314                             symbol__match_regex(al.sym, &parent_regex))
1315                                 *parent = al.sym;
1316                         else if (have_ignore_callees && root_al &&
1317                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1318                                 /* Treat this symbol as the root,
1319                                    forgetting its callees. */
1320                                 *root_al = al;
1321                                 callchain_cursor_reset(&callchain_cursor);
1322                         }
1323                         if (!symbol_conf.use_callchain)
1324                                 break;
1325                 }
1326
1327                 err = callchain_cursor_append(&callchain_cursor,
1328                                               ip, al.map, al.sym);
1329                 if (err)
1330                         return err;
1331         }
1332
1333         return 0;
1334 }
1335
1336 static int unwind_entry(struct unwind_entry *entry, void *arg)
1337 {
1338         struct callchain_cursor *cursor = arg;
1339         return callchain_cursor_append(cursor, entry->ip,
1340                                        entry->map, entry->sym);
1341 }
1342
1343 int machine__resolve_callchain(struct machine *machine,
1344                                struct perf_evsel *evsel,
1345                                struct thread *thread,
1346                                struct perf_sample *sample,
1347                                struct symbol **parent,
1348                                struct addr_location *root_al,
1349                                int max_stack)
1350 {
1351         int ret;
1352
1353         ret = machine__resolve_callchain_sample(machine, thread,
1354                                                 sample->callchain, parent,
1355                                                 root_al, max_stack);
1356         if (ret)
1357                 return ret;
1358
1359         /* Can we do dwarf post unwind? */
1360         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1361               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1362                 return 0;
1363
1364         /* Bail out if nothing was captured. */
1365         if ((!sample->user_regs.regs) ||
1366             (!sample->user_stack.size))
1367                 return 0;
1368
1369         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1370                                    thread, evsel->attr.sample_regs_user,
1371                                    sample);
1372
1373 }
1374
1375 int machine__for_each_thread(struct machine *machine,
1376                              int (*fn)(struct thread *thread, void *p),
1377                              void *priv)
1378 {
1379         struct rb_node *nd;
1380         struct thread *thread;
1381         int rc = 0;
1382
1383         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1384                 thread = rb_entry(nd, struct thread, rb_node);
1385                 rc = fn(thread, priv);
1386                 if (rc != 0)
1387                         return rc;
1388         }
1389
1390         list_for_each_entry(thread, &machine->dead_threads, node) {
1391                 rc = fn(thread, priv);
1392                 if (rc != 0)
1393                         return rc;
1394         }
1395         return rc;
1396 }
1397
1398 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1399                                   struct target *target, struct thread_map *threads,
1400                                   perf_event__handler_t process, bool data_mmap)
1401 {
1402         if (target__has_task(target))
1403                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1404         else if (target__has_cpu(target))
1405                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1406         /* command specified */
1407         return 0;
1408 }