tools/perf/util/machine.c

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