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 pid,
 331                                     pid_t tid)
 332 {
 333         return __machine__findnew_thread(machine, pid, tid, false);
 334 }
 335
 336 int machine__process_comm_event(struct machine *machine, union perf_event *event,
 337                                 struct perf_sample *sample)
 338 {
 339         struct thread *thread = machine__findnew_thread(machine,
 340                                                         event->comm.pid,
 341                                                         event->comm.tid);
 342
 343         if (dump_trace)
 344                 perf_event__fprintf_comm(event, stdout);
 345
 346         if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
 347                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 348                 return -1;
 349         }
 350
 351         return 0;
 352 }
 353
 354 int machine__process_lost_event(struct machine *machine __maybe_unused,
 355                                 union perf_event *event, struct perf_sample *sample __maybe_unused)
 356 {
 357         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 358                     event->lost.id, event->lost.lost);
 359         return 0;
 360 }
 361
 362 struct map *machine__new_module(struct machine *machine, u64 start,
 363                                 const char *filename)
 364 {
 365         struct map *map;
 366         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 367
 368         if (dso == NULL)
 369                 return NULL;
 370
 371         map = map__new2(start, dso, MAP__FUNCTION);
 372         if (map == NULL)
 373                 return NULL;
 374
 375         if (machine__is_host(machine))
 376                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 377         else
 378                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 379         map_groups__insert(&machine->kmaps, map);
 380         return map;
 381 }
 382
 383 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 384 {
 385         struct rb_node *nd;
 386         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 387                      __dsos__fprintf(&machines->host.user_dsos, fp);
 388
 389         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 390                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 391                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 392                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 393         }
 394
 395         return ret;
 396 }
 397
 398 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 399                                      bool (skip)(struct dso *dso, int parm), int parm)
 400 {
 401         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 402                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 403 }
 404
 405 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 406                                      bool (skip)(struct dso *dso, int parm), int parm)
 407 {
 408         struct rb_node *nd;
 409         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 410
 411         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 412                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 413                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 414         }
 415         return ret;
 416 }
 417
 418 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 419 {
 420         int i;
 421         size_t printed = 0;
 422         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 423
 424         if (kdso->has_build_id) {
 425                 char filename[PATH_MAX];
 426                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 427                         printed += fprintf(fp, "[0] %s\n", filename);
 428         }
 429
 430         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 431                 printed += fprintf(fp, "[%d] %s\n",
 432                                    i + kdso->has_build_id, vmlinux_path[i]);
 433
 434         return printed;
 435 }
 436
 437 size_t machine__fprintf(struct machine *machine, FILE *fp)
 438 {
 439         size_t ret = 0;
 440         struct rb_node *nd;
 441
 442         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 443                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 444
 445                 ret += thread__fprintf(pos, fp);
 446         }
 447
 448         return ret;
 449 }
 450
 451 static struct dso *machine__get_kernel(struct machine *machine)
 452 {
 453         const char *vmlinux_name = NULL;
 454         struct dso *kernel;
 455
 456         if (machine__is_host(machine)) {
 457                 vmlinux_name = symbol_conf.vmlinux_name;
 458                 if (!vmlinux_name)
 459                         vmlinux_name = "[kernel.kallsyms]";
 460
 461                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 462                                              "[kernel]",
 463                                              DSO_TYPE_KERNEL);
 464         } else {
 465                 char bf[PATH_MAX];
 466
 467                 if (machine__is_default_guest(machine))
 468                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 469                 if (!vmlinux_name)
 470                         vmlinux_name = machine__mmap_name(machine, bf,
 471                                                           sizeof(bf));
 472
 473                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 474                                              "[guest.kernel]",
 475                                              DSO_TYPE_GUEST_KERNEL);
 476         }
 477
 478         if (kernel != NULL && (!kernel->has_build_id))
 479                 dso__read_running_kernel_build_id(kernel, machine);
 480
 481         return kernel;
 482 }
 483
 484 struct process_args {
 485         u64 start;
 486 };
 487
 488 static int symbol__in_kernel(void *arg, const char *name,
 489                              char type __maybe_unused, u64 start)
 490 {
 491         struct process_args *args = arg;
 492
 493         if (strchr(name, '['))
 494                 return 0;
 495
 496         args->start = start;
 497         return 1;
 498 }
 499
 500 static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
 501                                            size_t bufsz)
 502 {
 503         if (machine__is_default_guest(machine))
 504                 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
 505         else
 506                 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
 507 }
 508
 509 /* Figure out the start address of kernel map from /proc/kallsyms */
 510 static u64 machine__get_kernel_start_addr(struct machine *machine)
 511 {
 512         char filename[PATH_MAX];
 513         struct process_args args;
 514
 515         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 516
 517         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 518                 return 0;
 519
 520         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
 521                 return 0;
 522
 523         return args.start;
 524 }
 525
 526 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 527 {
 528         enum map_type type;
 529         u64 start = machine__get_kernel_start_addr(machine);
 530
 531         for (type = 0; type < MAP__NR_TYPES; ++type) {
 532                 struct kmap *kmap;
 533
 534                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 535                 if (machine->vmlinux_maps[type] == NULL)
 536                         return -1;
 537
 538                 machine->vmlinux_maps[type]->map_ip =
 539                         machine->vmlinux_maps[type]->unmap_ip =
 540                                 identity__map_ip;
 541                 kmap = map__kmap(machine->vmlinux_maps[type]);
 542                 kmap->kmaps = &machine->kmaps;
 543                 map_groups__insert(&machine->kmaps,
 544                                    machine->vmlinux_maps[type]);
 545         }
 546
 547         return 0;
 548 }
 549
 550 void machine__destroy_kernel_maps(struct machine *machine)
 551 {
 552         enum map_type type;
 553
 554         for (type = 0; type < MAP__NR_TYPES; ++type) {
 555                 struct kmap *kmap;
 556
 557                 if (machine->vmlinux_maps[type] == NULL)
 558                         continue;
 559
 560                 kmap = map__kmap(machine->vmlinux_maps[type]);
 561                 map_groups__remove(&machine->kmaps,
 562                                    machine->vmlinux_maps[type]);
 563                 if (kmap->ref_reloc_sym) {
 564                         /*
 565                          * ref_reloc_sym is shared among all maps, so free just
 566                          * on one of them.
 567                          */
 568                         if (type == MAP__FUNCTION) {
 569                                 zfree((char **)&kmap->ref_reloc_sym->name);
 570                                 zfree(&kmap->ref_reloc_sym);
 571                         } else
 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, true);
 771                         dso__kernel_module_get_build_id(map->dso, "");
 772                 }
 773         }
 774
 775 out:
 776         closedir(dir);
 777         return ret;
 778 }
 779
 780 static int machine__set_modules_path(struct machine *machine)
 781 {
 782         char *version;
 783         char modules_path[PATH_MAX];
 784
 785         version = get_kernel_version(machine->root_dir);
 786         if (!version)
 787                 return -1;
 788
 789         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
 790                  machine->root_dir, version);
 791         free(version);
 792
 793         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
 794 }
 795
 796 static int machine__create_module(void *arg, const char *name, u64 start)
 797 {
 798         struct machine *machine = arg;
 799         struct map *map;
 800
 801         map = machine__new_module(machine, start, name);
 802         if (map == NULL)
 803                 return -1;
 804
 805         dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 806
 807         return 0;
 808 }
 809
 810 static int machine__create_modules(struct machine *machine)
 811 {
 812         const char *modules;
 813         char path[PATH_MAX];
 814
 815         if (machine__is_default_guest(machine)) {
 816                 modules = symbol_conf.default_guest_modules;
 817         } else {
 818                 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
 819                 modules = path;
 820         }
 821
 822         if (symbol__restricted_filename(modules, "/proc/modules"))
 823                 return -1;
 824
 825         if (modules__parse(modules, machine, machine__create_module))
 826                 return -1;
 827
 828         if (!machine__set_modules_path(machine))
 829                 return 0;
 830
 831         pr_debug("Problems setting modules path maps, continuing anyway...\n");
 832
 833         return 0;
 834 }
 835
 836 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
 837
 838 int machine__create_kernel_maps(struct machine *machine)
 839 {
 840         struct dso *kernel = machine__get_kernel(machine);
 841         char filename[PATH_MAX];
 842         const char *name;
 843         u64 addr = 0;
 844         int i;
 845
 846         machine__get_kallsyms_filename(machine, filename, PATH_MAX);
 847
 848         for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
 849                 addr = kallsyms__get_function_start(filename, name);
 850                 if (addr)
 851                         break;
 852         }
 853         if (!addr)
 854                 return -1;
 855
 856         if (kernel == NULL ||
 857             __machine__create_kernel_maps(machine, kernel) < 0)
 858                 return -1;
 859
 860         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 861                 if (machine__is_host(machine))
 862                         pr_debug("Problems creating module maps, "
 863                                  "continuing anyway...\n");
 864                 else
 865                         pr_debug("Problems creating module maps for guest %d, "
 866                                  "continuing anyway...\n", machine->pid);
 867         }
 868
 869         /*
 870          * Now that we have all the maps created, just set the ->end of them:
 871          */
 872         map_groups__fixup_end(&machine->kmaps);
 873
 874         if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
 875                                              addr)) {
 876                 machine__destroy_kernel_maps(machine);
 877                 return -1;
 878         }
 879
 880         return 0;
 881 }
 882
 883 static void machine__set_kernel_mmap_len(struct machine *machine,
 884                                          union perf_event *event)
 885 {
 886         int i;
 887
 888         for (i = 0; i < MAP__NR_TYPES; i++) {
 889                 machine->vmlinux_maps[i]->start = event->mmap.start;
 890                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 891                                                    event->mmap.len);
 892                 /*
 893                  * Be a bit paranoid here, some perf.data file came with
 894                  * a zero sized synthesized MMAP event for the kernel.
 895                  */
 896                 if (machine->vmlinux_maps[i]->end == 0)
 897                         machine->vmlinux_maps[i]->end = ~0ULL;
 898         }
 899 }
 900
 901 static bool machine__uses_kcore(struct machine *machine)
 902 {
 903         struct dso *dso;
 904
 905         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 906                 if (dso__is_kcore(dso))
 907                         return true;
 908         }
 909
 910         return false;
 911 }
 912
 913 static int machine__process_kernel_mmap_event(struct machine *machine,
 914                                               union perf_event *event)
 915 {
 916         struct map *map;
 917         char kmmap_prefix[PATH_MAX];
 918         enum dso_kernel_type kernel_type;
 919         bool is_kernel_mmap;
 920
 921         /* If we have maps from kcore then we do not need or want any others */
 922         if (machine__uses_kcore(machine))
 923                 return 0;
 924
 925         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 926         if (machine__is_host(machine))
 927                 kernel_type = DSO_TYPE_KERNEL;
 928         else
 929                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 930
 931         is_kernel_mmap = memcmp(event->mmap.filename,
 932                                 kmmap_prefix,
 933                                 strlen(kmmap_prefix) - 1) == 0;
 934         if (event->mmap.filename[0] == '/' ||
 935             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 936
 937                 char short_module_name[1024];
 938                 char *name, *dot;
 939
 940                 if (event->mmap.filename[0] == '/') {
 941                         name = strrchr(event->mmap.filename, '/');
 942                         if (name == NULL)
 943                                 goto out_problem;
 944
 945                         ++name; /* skip / */
 946                         dot = strrchr(name, '.');
 947                         if (dot == NULL)
 948                                 goto out_problem;
 949                         snprintf(short_module_name, sizeof(short_module_name),
 950                                         "[%.*s]", (int)(dot - name), name);
 951                         strxfrchar(short_module_name, '-', '_');
 952                 } else
 953                         strcpy(short_module_name, event->mmap.filename);
 954
 955                 map = machine__new_module(machine, event->mmap.start,
 956                                           event->mmap.filename);
 957                 if (map == NULL)
 958                         goto out_problem;
 959
 960                 name = strdup(short_module_name);
 961                 if (name == NULL)
 962                         goto out_problem;
 963
 964                 dso__set_short_name(map->dso, name, true);
 965                 map->end = map->start + event->mmap.len;
 966         } else if (is_kernel_mmap) {
 967                 const char *symbol_name = (event->mmap.filename +
 968                                 strlen(kmmap_prefix));
 969                 /*
 970                  * Should be there already, from the build-id table in
 971                  * the header.
 972                  */
 973                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 974                                                      kmmap_prefix);
 975                 if (kernel == NULL)
 976                         goto out_problem;
 977
 978                 kernel->kernel = kernel_type;
 979                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 980                         goto out_problem;
 981
 982                 machine__set_kernel_mmap_len(machine, event);
 983
 984                 /*
 985                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 986                  * symbol. Effectively having zero here means that at record
 987                  * time /proc/sys/kernel/kptr_restrict was non zero.
 988                  */
 989                 if (event->mmap.pgoff != 0) {
 990                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 991                                                          symbol_name,
 992                                                          event->mmap.pgoff);
 993                 }
 994
 995                 if (machine__is_default_guest(machine)) {
 996                         /*
 997                          * preload dso of guest kernel and modules
 998                          */
 999                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1000                                   NULL);
1001                 }
1002         }
1003         return 0;
1004 out_problem:
1005         return -1;
1006 }
1007
1008 int machine__process_mmap2_event(struct machine *machine,
1009                                  union perf_event *event,
1010                                  struct perf_sample *sample __maybe_unused)
1011 {
1012         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1013         struct thread *thread;
1014         struct map *map;
1015         enum map_type type;
1016         int ret = 0;
1017
1018         if (dump_trace)
1019                 perf_event__fprintf_mmap2(event, stdout);
1020
1021         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1022             cpumode == PERF_RECORD_MISC_KERNEL) {
1023                 ret = machine__process_kernel_mmap_event(machine, event);
1024                 if (ret < 0)
1025                         goto out_problem;
1026                 return 0;
1027         }
1028
1029         thread = machine__findnew_thread(machine, event->mmap2.pid,
1030                                         event->mmap2.tid);
1031         if (thread == NULL)
1032                 goto out_problem;
1033
1034         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1035                 type = MAP__VARIABLE;
1036         else
1037                 type = MAP__FUNCTION;
1038
1039         map = map__new(&machine->user_dsos, event->mmap2.start,
1040                         event->mmap2.len, event->mmap2.pgoff,
1041                         event->mmap2.pid, event->mmap2.maj,
1042                         event->mmap2.min, event->mmap2.ino,
1043                         event->mmap2.ino_generation,
1044                         event->mmap2.filename, type);
1045
1046         if (map == NULL)
1047                 goto out_problem;
1048
1049         thread__insert_map(thread, map);
1050         return 0;
1051
1052 out_problem:
1053         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1054         return 0;
1055 }
1056
1057 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1058                                 struct perf_sample *sample __maybe_unused)
1059 {
1060         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1061         struct thread *thread;
1062         struct map *map;
1063         enum map_type type;
1064         int ret = 0;
1065
1066         if (dump_trace)
1067                 perf_event__fprintf_mmap(event, stdout);
1068
1069         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1070             cpumode == PERF_RECORD_MISC_KERNEL) {
1071                 ret = machine__process_kernel_mmap_event(machine, event);
1072                 if (ret < 0)
1073                         goto out_problem;
1074                 return 0;
1075         }
1076
1077         thread = machine__findnew_thread(machine, event->mmap.pid,
1078                                          event->mmap.tid);
1079         if (thread == NULL)
1080                 goto out_problem;
1081
1082         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1083                 type = MAP__VARIABLE;
1084         else
1085                 type = MAP__FUNCTION;
1086
1087         map = map__new(&machine->user_dsos, event->mmap.start,
1088                         event->mmap.len, event->mmap.pgoff,
1089                         event->mmap.pid, 0, 0, 0, 0,
1090                         event->mmap.filename,
1091                         type);
1092
1093         if (map == NULL)
1094                 goto out_problem;
1095
1096         thread__insert_map(thread, map);
1097         return 0;
1098
1099 out_problem:
1100         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1101         return 0;
1102 }
1103
1104 static void machine__remove_thread(struct machine *machine, struct thread *th)
1105 {
1106         machine->last_match = NULL;
1107         rb_erase(&th->rb_node, &machine->threads);
1108         /*
1109          * We may have references to this thread, for instance in some hist_entry
1110          * instances, so just move them to a separate list.
1111          */
1112         list_add_tail(&th->node, &machine->dead_threads);
1113 }
1114
1115 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1116                                 struct perf_sample *sample)
1117 {
1118         struct thread *thread = machine__find_thread(machine,
1119                                                      event->fork.pid,
1120                                                      event->fork.tid);
1121         struct thread *parent = machine__findnew_thread(machine,
1122                                                         event->fork.ppid,
1123                                                         event->fork.ptid);
1124
1125         /* if a thread currently exists for the thread id remove it */
1126         if (thread != NULL)
1127                 machine__remove_thread(machine, thread);
1128
1129         thread = machine__findnew_thread(machine, event->fork.pid,
1130                                          event->fork.tid);
1131         if (dump_trace)
1132                 perf_event__fprintf_task(event, stdout);
1133
1134         if (thread == NULL || parent == NULL ||
1135             thread__fork(thread, parent, sample->time) < 0) {
1136                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1137                 return -1;
1138         }
1139
1140         return 0;
1141 }
1142
1143 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1144                                 struct perf_sample *sample __maybe_unused)
1145 {
1146         struct thread *thread = machine__find_thread(machine,
1147                                                      event->fork.pid,
1148                                                      event->fork.tid);
1149
1150         if (dump_trace)
1151                 perf_event__fprintf_task(event, stdout);
1152
1153         if (thread != NULL)
1154                 thread__exited(thread);
1155
1156         return 0;
1157 }
1158
1159 int machine__process_event(struct machine *machine, union perf_event *event,
1160                            struct perf_sample *sample)
1161 {
1162         int ret;
1163
1164         switch (event->header.type) {
1165         case PERF_RECORD_COMM:
1166                 ret = machine__process_comm_event(machine, event, sample); break;
1167         case PERF_RECORD_MMAP:
1168                 ret = machine__process_mmap_event(machine, event, sample); break;
1169         case PERF_RECORD_MMAP2:
1170                 ret = machine__process_mmap2_event(machine, event, sample); break;
1171         case PERF_RECORD_FORK:
1172                 ret = machine__process_fork_event(machine, event, sample); break;
1173         case PERF_RECORD_EXIT:
1174                 ret = machine__process_exit_event(machine, event, sample); break;
1175         case PERF_RECORD_LOST:
1176                 ret = machine__process_lost_event(machine, event, sample); break;
1177         default:
1178                 ret = -1;
1179                 break;
1180         }
1181
1182         return ret;
1183 }
1184
1185 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1186 {
1187         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1188                 return 1;
1189         return 0;
1190 }
1191
1192 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1193                             struct addr_map_symbol *ams,
1194                             u64 ip)
1195 {
1196         struct addr_location al;
1197
1198         memset(&al, 0, sizeof(al));
1199         /*
1200          * We cannot use the header.misc hint to determine whether a
1201          * branch stack address is user, kernel, guest, hypervisor.
1202          * Branches may straddle the kernel/user/hypervisor boundaries.
1203          * Thus, we have to try consecutively until we find a match
1204          * or else, the symbol is unknown
1205          */
1206         thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1207
1208         ams->addr = ip;
1209         ams->al_addr = al.addr;
1210         ams->sym = al.sym;
1211         ams->map = al.map;
1212 }
1213
1214 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1215                              u8 m, struct addr_map_symbol *ams, u64 addr)
1216 {
1217         struct addr_location al;
1218
1219         memset(&al, 0, sizeof(al));
1220
1221         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1222                                    &al);
1223         ams->addr = addr;
1224         ams->al_addr = al.addr;
1225         ams->sym = al.sym;
1226         ams->map = al.map;
1227 }
1228
1229 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1230                                      struct addr_location *al)
1231 {
1232         struct mem_info *mi = zalloc(sizeof(*mi));
1233
1234         if (!mi)
1235                 return NULL;
1236
1237         ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1238         ip__resolve_data(al->machine, al->thread, al->cpumode,
1239                          &mi->daddr, sample->addr);
1240         mi->data_src.val = sample->data_src;
1241
1242         return mi;
1243 }
1244
1245 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1246                                            struct addr_location *al)
1247 {
1248         unsigned int i;
1249         const struct branch_stack *bs = sample->branch_stack;
1250         struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1251
1252         if (!bi)
1253                 return NULL;
1254
1255         for (i = 0; i < bs->nr; i++) {
1256                 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1257                 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1258                 bi[i].flags = bs->entries[i].flags;
1259         }
1260         return bi;
1261 }
1262
1263 static int machine__resolve_callchain_sample(struct machine *machine,
1264                                              struct thread *thread,
1265                                              struct ip_callchain *chain,
1266                                              struct symbol **parent,
1267                                              struct addr_location *root_al,
1268                                              int max_stack)
1269 {
1270         u8 cpumode = PERF_RECORD_MISC_USER;
1271         int chain_nr = min(max_stack, (int)chain->nr);
1272         int i;
1273         int err;
1274
1275         callchain_cursor_reset(&callchain_cursor);
1276
1277         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1278                 pr_warning("corrupted callchain. skipping...\n");
1279                 return 0;
1280         }
1281
1282         for (i = 0; i < chain_nr; i++) {
1283                 u64 ip;
1284                 struct addr_location al;
1285
1286                 if (callchain_param.order == ORDER_CALLEE)
1287                         ip = chain->ips[i];
1288                 else
1289                         ip = chain->ips[chain->nr - i - 1];
1290
1291                 if (ip >= PERF_CONTEXT_MAX) {
1292                         switch (ip) {
1293                         case PERF_CONTEXT_HV:
1294                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1295                                 break;
1296                         case PERF_CONTEXT_KERNEL:
1297                                 cpumode = PERF_RECORD_MISC_KERNEL;
1298                                 break;
1299                         case PERF_CONTEXT_USER:
1300                                 cpumode = PERF_RECORD_MISC_USER;
1301                                 break;
1302                         default:
1303                                 pr_debug("invalid callchain context: "
1304                                          "%"PRId64"\n", (s64) ip);
1305                                 /*
1306                                  * It seems the callchain is corrupted.
1307                                  * Discard all.
1308                                  */
1309                                 callchain_cursor_reset(&callchain_cursor);
1310                                 return 0;
1311                         }
1312                         continue;
1313                 }
1314
1315                 al.filtered = 0;
1316                 thread__find_addr_location(thread, machine, cpumode,
1317                                            MAP__FUNCTION, ip, &al);
1318                 if (al.sym != NULL) {
1319                         if (sort__has_parent && !*parent &&
1320                             symbol__match_regex(al.sym, &parent_regex))
1321                                 *parent = al.sym;
1322                         else if (have_ignore_callees && root_al &&
1323                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1324                                 /* Treat this symbol as the root,
1325                                    forgetting its callees. */
1326                                 *root_al = al;
1327                                 callchain_cursor_reset(&callchain_cursor);
1328                         }
1329                 }
1330
1331                 err = callchain_cursor_append(&callchain_cursor,
1332                                               ip, al.map, al.sym);
1333                 if (err)
1334                         return err;
1335         }
1336
1337         return 0;
1338 }
1339
1340 static int unwind_entry(struct unwind_entry *entry, void *arg)
1341 {
1342         struct callchain_cursor *cursor = arg;
1343         return callchain_cursor_append(cursor, entry->ip,
1344                                        entry->map, entry->sym);
1345 }
1346
1347 int machine__resolve_callchain(struct machine *machine,
1348                                struct perf_evsel *evsel,
1349                                struct thread *thread,
1350                                struct perf_sample *sample,
1351                                struct symbol **parent,
1352                                struct addr_location *root_al,
1353                                int max_stack)
1354 {
1355         int ret;
1356
1357         ret = machine__resolve_callchain_sample(machine, thread,
1358                                                 sample->callchain, parent,
1359                                                 root_al, max_stack);
1360         if (ret)
1361                 return ret;
1362
1363         /* Can we do dwarf post unwind? */
1364         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1365               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1366                 return 0;
1367
1368         /* Bail out if nothing was captured. */
1369         if ((!sample->user_regs.regs) ||
1370             (!sample->user_stack.size))
1371                 return 0;
1372
1373         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1374                                    thread, sample, max_stack);
1375
1376 }
1377
1378 int machine__for_each_thread(struct machine *machine,
1379                              int (*fn)(struct thread *thread, void *p),
1380                              void *priv)
1381 {
1382         struct rb_node *nd;
1383         struct thread *thread;
1384         int rc = 0;
1385
1386         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1387                 thread = rb_entry(nd, struct thread, rb_node);
1388                 rc = fn(thread, priv);
1389                 if (rc != 0)
1390                         return rc;
1391         }
1392
1393         list_for_each_entry(thread, &machine->dead_threads, node) {
1394                 rc = fn(thread, priv);
1395                 if (rc != 0)
1396                         return rc;
1397         }
1398         return rc;
1399 }
1400
1401 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1402                                   struct target *target, struct thread_map *threads,
1403                                   perf_event__handler_t process, bool data_mmap)
1404 {
1405         if (target__has_task(target))
1406                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1407         else if (target__has_cpu(target))
1408                 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1409         /* command specified */
1410         return 0;
1411 }