tools/perf/util/machine.c

   1 #include "callchain.h"
   2 #include "debug.h"
   3 #include "event.h"
   4 #include "evsel.h"
   5 #include "hist.h"
   6 #include "machine.h"
   7 #include "map.h"
   8 #include "sort.h"
   9 #include "strlist.h"
  10 #include "thread.h"
  11 #include <stdbool.h>
  12 #include "unwind.h"
  13
  14 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
  15 {
  16         map_groups__init(&machine->kmaps);
  17         RB_CLEAR_NODE(&machine->rb_node);
  18         INIT_LIST_HEAD(&machine->user_dsos);
  19         INIT_LIST_HEAD(&machine->kernel_dsos);
  20
  21         machine->threads = RB_ROOT;
  22         INIT_LIST_HEAD(&machine->dead_threads);
  23         machine->last_match = NULL;
  24
  25         machine->kmaps.machine = machine;
  26         machine->pid = pid;
  27
  28         machine->symbol_filter = NULL;
  29
  30         machine->root_dir = strdup(root_dir);
  31         if (machine->root_dir == NULL)
  32                 return -ENOMEM;
  33
  34         if (pid != HOST_KERNEL_ID) {
  35                 struct thread *thread = machine__findnew_thread(machine, 0,
  36                                                                 pid);
  37                 char comm[64];
  38
  39                 if (thread == NULL)
  40                         return -ENOMEM;
  41
  42                 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
  43                 thread__set_comm(thread, comm);
  44         }
  45
  46         return 0;
  47 }
  48
  49 static void dsos__delete(struct list_head *dsos)
  50 {
  51         struct dso *pos, *n;
  52
  53         list_for_each_entry_safe(pos, n, dsos, node) {
  54                 list_del(&pos->node);
  55                 dso__delete(pos);
  56         }
  57 }
  58
  59 void machine__delete_dead_threads(struct machine *machine)
  60 {
  61         struct thread *n, *t;
  62
  63         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
  64                 list_del(&t->node);
  65                 thread__delete(t);
  66         }
  67 }
  68
  69 void machine__delete_threads(struct machine *machine)
  70 {
  71         struct rb_node *nd = rb_first(&machine->threads);
  72
  73         while (nd) {
  74                 struct thread *t = rb_entry(nd, struct thread, rb_node);
  75
  76                 rb_erase(&t->rb_node, &machine->threads);
  77                 nd = rb_next(nd);
  78                 thread__delete(t);
  79         }
  80 }
  81
  82 void machine__exit(struct machine *machine)
  83 {
  84         map_groups__exit(&machine->kmaps);
  85         dsos__delete(&machine->user_dsos);
  86         dsos__delete(&machine->kernel_dsos);
  87         free(machine->root_dir);
  88         machine->root_dir = NULL;
  89 }
  90
  91 void machine__delete(struct machine *machine)
  92 {
  93         machine__exit(machine);
  94         free(machine);
  95 }
  96
  97 void machines__init(struct machines *machines)
  98 {
  99         machine__init(&machines->host, "", HOST_KERNEL_ID);
 100         machines->guests = RB_ROOT;
 101         machines->symbol_filter = NULL;
 102 }
 103
 104 void machines__exit(struct machines *machines)
 105 {
 106         machine__exit(&machines->host);
 107         /* XXX exit guest */
 108 }
 109
 110 struct machine *machines__add(struct machines *machines, pid_t pid,
 111                               const char *root_dir)
 112 {
 113         struct rb_node **p = &machines->guests.rb_node;
 114         struct rb_node *parent = NULL;
 115         struct machine *pos, *machine = malloc(sizeof(*machine));
 116
 117         if (machine == NULL)
 118                 return NULL;
 119
 120         if (machine__init(machine, root_dir, pid) != 0) {
 121                 free(machine);
 122                 return NULL;
 123         }
 124
 125         machine->symbol_filter = machines->symbol_filter;
 126
 127         while (*p != NULL) {
 128                 parent = *p;
 129                 pos = rb_entry(parent, struct machine, rb_node);
 130                 if (pid < pos->pid)
 131                         p = &(*p)->rb_left;
 132                 else
 133                         p = &(*p)->rb_right;
 134         }
 135
 136         rb_link_node(&machine->rb_node, parent, p);
 137         rb_insert_color(&machine->rb_node, &machines->guests);
 138
 139         return machine;
 140 }
 141
 142 void machines__set_symbol_filter(struct machines *machines,
 143                                  symbol_filter_t symbol_filter)
 144 {
 145         struct rb_node *nd;
 146
 147         machines->symbol_filter = symbol_filter;
 148         machines->host.symbol_filter = symbol_filter;
 149
 150         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 151                 struct machine *machine = rb_entry(nd, struct machine, rb_node);
 152
 153                 machine->symbol_filter = symbol_filter;
 154         }
 155 }
 156
 157 struct machine *machines__find(struct machines *machines, pid_t pid)
 158 {
 159         struct rb_node **p = &machines->guests.rb_node;
 160         struct rb_node *parent = NULL;
 161         struct machine *machine;
 162         struct machine *default_machine = NULL;
 163
 164         if (pid == HOST_KERNEL_ID)
 165                 return &machines->host;
 166
 167         while (*p != NULL) {
 168                 parent = *p;
 169                 machine = rb_entry(parent, struct machine, rb_node);
 170                 if (pid < machine->pid)
 171                         p = &(*p)->rb_left;
 172                 else if (pid > machine->pid)
 173                         p = &(*p)->rb_right;
 174                 else
 175                         return machine;
 176                 if (!machine->pid)
 177                         default_machine = machine;
 178         }
 179
 180         return default_machine;
 181 }
 182
 183 struct machine *machines__findnew(struct machines *machines, pid_t pid)
 184 {
 185         char path[PATH_MAX];
 186         const char *root_dir = "";
 187         struct machine *machine = machines__find(machines, pid);
 188
 189         if (machine && (machine->pid == pid))
 190                 goto out;
 191
 192         if ((pid != HOST_KERNEL_ID) &&
 193             (pid != DEFAULT_GUEST_KERNEL_ID) &&
 194             (symbol_conf.guestmount)) {
 195                 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
 196                 if (access(path, R_OK)) {
 197                         static struct strlist *seen;
 198
 199                         if (!seen)
 200                                 seen = strlist__new(true, NULL);
 201
 202                         if (!strlist__has_entry(seen, path)) {
 203                                 pr_err("Can't access file %s\n", path);
 204                                 strlist__add(seen, path);
 205                         }
 206                         machine = NULL;
 207                         goto out;
 208                 }
 209                 root_dir = path;
 210         }
 211
 212         machine = machines__add(machines, pid, root_dir);
 213 out:
 214         return machine;
 215 }
 216
 217 void machines__process_guests(struct machines *machines,
 218                               machine__process_t process, void *data)
 219 {
 220         struct rb_node *nd;
 221
 222         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 223                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 224                 process(pos, data);
 225         }
 226 }
 227
 228 char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
 229 {
 230         if (machine__is_host(machine))
 231                 snprintf(bf, size, "[%s]", "kernel.kallsyms");
 232         else if (machine__is_default_guest(machine))
 233                 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
 234         else {
 235                 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
 236                          machine->pid);
 237         }
 238
 239         return bf;
 240 }
 241
 242 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
 243 {
 244         struct rb_node *node;
 245         struct machine *machine;
 246
 247         machines->host.id_hdr_size = id_hdr_size;
 248
 249         for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
 250                 machine = rb_entry(node, struct machine, rb_node);
 251                 machine->id_hdr_size = id_hdr_size;
 252         }
 253
 254         return;
 255 }
 256
 257 static struct thread *__machine__findnew_thread(struct machine *machine,
 258                                                 pid_t pid, pid_t tid,
 259                                                 bool create)
 260 {
 261         struct rb_node **p = &machine->threads.rb_node;
 262         struct rb_node *parent = NULL;
 263         struct thread *th;
 264
 265         /*
 266          * Front-end cache - TID lookups come in blocks,
 267          * so most of the time we dont have to look up
 268          * the full rbtree:
 269          */
 270         if (machine->last_match && machine->last_match->tid == tid) {
 271                 if (pid && pid != machine->last_match->pid_)
 272                         machine->last_match->pid_ = pid;
 273                 return machine->last_match;
 274         }
 275
 276         while (*p != NULL) {
 277                 parent = *p;
 278                 th = rb_entry(parent, struct thread, rb_node);
 279
 280                 if (th->tid == tid) {
 281                         machine->last_match = th;
 282                         if (pid && pid != th->pid_)
 283                                 th->pid_ = pid;
 284                         return th;
 285                 }
 286
 287                 if (tid < th->tid)
 288                         p = &(*p)->rb_left;
 289                 else
 290                         p = &(*p)->rb_right;
 291         }
 292
 293         if (!create)
 294                 return NULL;
 295
 296         th = thread__new(pid, tid);
 297         if (th != NULL) {
 298                 rb_link_node(&th->rb_node, parent, p);
 299                 rb_insert_color(&th->rb_node, &machine->threads);
 300                 machine->last_match = th;
 301         }
 302
 303         return th;
 304 }
 305
 306 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
 307                                        pid_t tid)
 308 {
 309         return __machine__findnew_thread(machine, pid, tid, true);
 310 }
 311
 312 struct thread *machine__find_thread(struct machine *machine, pid_t tid)
 313 {
 314         return __machine__findnew_thread(machine, 0, tid, false);
 315 }
 316
 317 int machine__process_comm_event(struct machine *machine, union perf_event *event)
 318 {
 319         struct thread *thread = machine__findnew_thread(machine,
 320                                                         event->comm.pid,
 321                                                         event->comm.tid);
 322
 323         if (dump_trace)
 324                 perf_event__fprintf_comm(event, stdout);
 325
 326         if (thread == NULL || thread__set_comm(thread, event->comm.comm)) {
 327                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 328                 return -1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 int machine__process_lost_event(struct machine *machine __maybe_unused,
 335                                 union perf_event *event)
 336 {
 337         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 338                     event->lost.id, event->lost.lost);
 339         return 0;
 340 }
 341
 342 struct map *machine__new_module(struct machine *machine, u64 start,
 343                                 const char *filename)
 344 {
 345         struct map *map;
 346         struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
 347
 348         if (dso == NULL)
 349                 return NULL;
 350
 351         map = map__new2(start, dso, MAP__FUNCTION);
 352         if (map == NULL)
 353                 return NULL;
 354
 355         if (machine__is_host(machine))
 356                 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
 357         else
 358                 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
 359         map_groups__insert(&machine->kmaps, map);
 360         return map;
 361 }
 362
 363 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
 364 {
 365         struct rb_node *nd;
 366         size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
 367                      __dsos__fprintf(&machines->host.user_dsos, fp);
 368
 369         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 370                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 371                 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
 372                 ret += __dsos__fprintf(&pos->user_dsos, fp);
 373         }
 374
 375         return ret;
 376 }
 377
 378 size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
 379                                      bool (skip)(struct dso *dso, int parm), int parm)
 380 {
 381         return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
 382                __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
 383 }
 384
 385 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
 386                                      bool (skip)(struct dso *dso, int parm), int parm)
 387 {
 388         struct rb_node *nd;
 389         size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
 390
 391         for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
 392                 struct machine *pos = rb_entry(nd, struct machine, rb_node);
 393                 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
 394         }
 395         return ret;
 396 }
 397
 398 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
 399 {
 400         int i;
 401         size_t printed = 0;
 402         struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
 403
 404         if (kdso->has_build_id) {
 405                 char filename[PATH_MAX];
 406                 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
 407                         printed += fprintf(fp, "[0] %s\n", filename);
 408         }
 409
 410         for (i = 0; i < vmlinux_path__nr_entries; ++i)
 411                 printed += fprintf(fp, "[%d] %s\n",
 412                                    i + kdso->has_build_id, vmlinux_path[i]);
 413
 414         return printed;
 415 }
 416
 417 size_t machine__fprintf(struct machine *machine, FILE *fp)
 418 {
 419         size_t ret = 0;
 420         struct rb_node *nd;
 421
 422         for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
 423                 struct thread *pos = rb_entry(nd, struct thread, rb_node);
 424
 425                 ret += thread__fprintf(pos, fp);
 426         }
 427
 428         return ret;
 429 }
 430
 431 static struct dso *machine__get_kernel(struct machine *machine)
 432 {
 433         const char *vmlinux_name = NULL;
 434         struct dso *kernel;
 435
 436         if (machine__is_host(machine)) {
 437                 vmlinux_name = symbol_conf.vmlinux_name;
 438                 if (!vmlinux_name)
 439                         vmlinux_name = "[kernel.kallsyms]";
 440
 441                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 442                                              "[kernel]",
 443                                              DSO_TYPE_KERNEL);
 444         } else {
 445                 char bf[PATH_MAX];
 446
 447                 if (machine__is_default_guest(machine))
 448                         vmlinux_name = symbol_conf.default_guest_vmlinux_name;
 449                 if (!vmlinux_name)
 450                         vmlinux_name = machine__mmap_name(machine, bf,
 451                                                           sizeof(bf));
 452
 453                 kernel = dso__kernel_findnew(machine, vmlinux_name,
 454                                              "[guest.kernel]",
 455                                              DSO_TYPE_GUEST_KERNEL);
 456         }
 457
 458         if (kernel != NULL && (!kernel->has_build_id))
 459                 dso__read_running_kernel_build_id(kernel, machine);
 460
 461         return kernel;
 462 }
 463
 464 struct process_args {
 465         u64 start;
 466 };
 467
 468 static int symbol__in_kernel(void *arg, const char *name,
 469                              char type __maybe_unused, u64 start)
 470 {
 471         struct process_args *args = arg;
 472
 473         if (strchr(name, '['))
 474                 return 0;
 475
 476         args->start = start;
 477         return 1;
 478 }
 479
 480 /* Figure out the start address of kernel map from /proc/kallsyms */
 481 static u64 machine__get_kernel_start_addr(struct machine *machine)
 482 {
 483         const char *filename;
 484         char path[PATH_MAX];
 485         struct process_args args;
 486
 487         if (machine__is_host(machine)) {
 488                 filename = "/proc/kallsyms";
 489         } else {
 490                 if (machine__is_default_guest(machine))
 491                         filename = (char *)symbol_conf.default_guest_kallsyms;
 492                 else {
 493                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 494                         filename = path;
 495                 }
 496         }
 497
 498         if (symbol__restricted_filename(filename, "/proc/kallsyms"))
 499                 return 0;
 500
 501         if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
 502                 return 0;
 503
 504         return args.start;
 505 }
 506
 507 int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
 508 {
 509         enum map_type type;
 510         u64 start = machine__get_kernel_start_addr(machine);
 511
 512         for (type = 0; type < MAP__NR_TYPES; ++type) {
 513                 struct kmap *kmap;
 514
 515                 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
 516                 if (machine->vmlinux_maps[type] == NULL)
 517                         return -1;
 518
 519                 machine->vmlinux_maps[type]->map_ip =
 520                         machine->vmlinux_maps[type]->unmap_ip =
 521                                 identity__map_ip;
 522                 kmap = map__kmap(machine->vmlinux_maps[type]);
 523                 kmap->kmaps = &machine->kmaps;
 524                 map_groups__insert(&machine->kmaps,
 525                                    machine->vmlinux_maps[type]);
 526         }
 527
 528         return 0;
 529 }
 530
 531 void machine__destroy_kernel_maps(struct machine *machine)
 532 {
 533         enum map_type type;
 534
 535         for (type = 0; type < MAP__NR_TYPES; ++type) {
 536                 struct kmap *kmap;
 537
 538                 if (machine->vmlinux_maps[type] == NULL)
 539                         continue;
 540
 541                 kmap = map__kmap(machine->vmlinux_maps[type]);
 542                 map_groups__remove(&machine->kmaps,
 543                                    machine->vmlinux_maps[type]);
 544                 if (kmap->ref_reloc_sym) {
 545                         /*
 546                          * ref_reloc_sym is shared among all maps, so free just
 547                          * on one of them.
 548                          */
 549                         if (type == MAP__FUNCTION) {
 550                                 free((char *)kmap->ref_reloc_sym->name);
 551                                 kmap->ref_reloc_sym->name = NULL;
 552                                 free(kmap->ref_reloc_sym);
 553                         }
 554                         kmap->ref_reloc_sym = NULL;
 555                 }
 556
 557                 map__delete(machine->vmlinux_maps[type]);
 558                 machine->vmlinux_maps[type] = NULL;
 559         }
 560 }
 561
 562 int machines__create_guest_kernel_maps(struct machines *machines)
 563 {
 564         int ret = 0;
 565         struct dirent **namelist = NULL;
 566         int i, items = 0;
 567         char path[PATH_MAX];
 568         pid_t pid;
 569         char *endp;
 570
 571         if (symbol_conf.default_guest_vmlinux_name ||
 572             symbol_conf.default_guest_modules ||
 573             symbol_conf.default_guest_kallsyms) {
 574                 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
 575         }
 576
 577         if (symbol_conf.guestmount) {
 578                 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
 579                 if (items <= 0)
 580                         return -ENOENT;
 581                 for (i = 0; i < items; i++) {
 582                         if (!isdigit(namelist[i]->d_name[0])) {
 583                                 /* Filter out . and .. */
 584                                 continue;
 585                         }
 586                         pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
 587                         if ((*endp != '\0') ||
 588                             (endp == namelist[i]->d_name) ||
 589                             (errno == ERANGE)) {
 590                                 pr_debug("invalid directory (%s). Skipping.\n",
 591                                          namelist[i]->d_name);
 592                                 continue;
 593                         }
 594                         sprintf(path, "%s/%s/proc/kallsyms",
 595                                 symbol_conf.guestmount,
 596                                 namelist[i]->d_name);
 597                         ret = access(path, R_OK);
 598                         if (ret) {
 599                                 pr_debug("Can't access file %s\n", path);
 600                                 goto failure;
 601                         }
 602                         machines__create_kernel_maps(machines, pid);
 603                 }
 604 failure:
 605                 free(namelist);
 606         }
 607
 608         return ret;
 609 }
 610
 611 void machines__destroy_kernel_maps(struct machines *machines)
 612 {
 613         struct rb_node *next = rb_first(&machines->guests);
 614
 615         machine__destroy_kernel_maps(&machines->host);
 616
 617         while (next) {
 618                 struct machine *pos = rb_entry(next, struct machine, rb_node);
 619
 620                 next = rb_next(&pos->rb_node);
 621                 rb_erase(&pos->rb_node, &machines->guests);
 622                 machine__delete(pos);
 623         }
 624 }
 625
 626 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
 627 {
 628         struct machine *machine = machines__findnew(machines, pid);
 629
 630         if (machine == NULL)
 631                 return -1;
 632
 633         return machine__create_kernel_maps(machine);
 634 }
 635
 636 int machine__load_kallsyms(struct machine *machine, const char *filename,
 637                            enum map_type type, symbol_filter_t filter)
 638 {
 639         struct map *map = machine->vmlinux_maps[type];
 640         int ret = dso__load_kallsyms(map->dso, filename, map, filter);
 641
 642         if (ret > 0) {
 643                 dso__set_loaded(map->dso, type);
 644                 /*
 645                  * Since /proc/kallsyms will have multiple sessions for the
 646                  * kernel, with modules between them, fixup the end of all
 647                  * sections.
 648                  */
 649                 __map_groups__fixup_end(&machine->kmaps, type);
 650         }
 651
 652         return ret;
 653 }
 654
 655 int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
 656                                symbol_filter_t filter)
 657 {
 658         struct map *map = machine->vmlinux_maps[type];
 659         int ret = dso__load_vmlinux_path(map->dso, map, filter);
 660
 661         if (ret > 0)
 662                 dso__set_loaded(map->dso, type);
 663
 664         return ret;
 665 }
 666
 667 static void map_groups__fixup_end(struct map_groups *mg)
 668 {
 669         int i;
 670         for (i = 0; i < MAP__NR_TYPES; ++i)
 671                 __map_groups__fixup_end(mg, i);
 672 }
 673
 674 static char *get_kernel_version(const char *root_dir)
 675 {
 676         char version[PATH_MAX];
 677         FILE *file;
 678         char *name, *tmp;
 679         const char *prefix = "Linux version ";
 680
 681         sprintf(version, "%s/proc/version", root_dir);
 682         file = fopen(version, "r");
 683         if (!file)
 684                 return NULL;
 685
 686         version[0] = '\0';
 687         tmp = fgets(version, sizeof(version), file);
 688         fclose(file);
 689
 690         name = strstr(version, prefix);
 691         if (!name)
 692                 return NULL;
 693         name += strlen(prefix);
 694         tmp = strchr(name, ' ');
 695         if (tmp)
 696                 *tmp = '\0';
 697
 698         return strdup(name);
 699 }
 700
 701 static int map_groups__set_modules_path_dir(struct map_groups *mg,
 702                                 const char *dir_name)
 703 {
 704         struct dirent *dent;
 705         DIR *dir = opendir(dir_name);
 706         int ret = 0;
 707
 708         if (!dir) {
 709                 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
 710                 return -1;
 711         }
 712
 713         while ((dent = readdir(dir)) != NULL) {
 714                 char path[PATH_MAX];
 715                 struct stat st;
 716
 717                 /*sshfs might return bad dent->d_type, so we have to stat*/
 718                 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
 719                 if (stat(path, &st))
 720                         continue;
 721
 722                 if (S_ISDIR(st.st_mode)) {
 723                         if (!strcmp(dent->d_name, ".") ||
 724                             !strcmp(dent->d_name, ".."))
 725                                 continue;
 726
 727                         ret = map_groups__set_modules_path_dir(mg, path);
 728                         if (ret < 0)
 729                                 goto out;
 730                 } else {
 731                         char *dot = strrchr(dent->d_name, '.'),
 732                              dso_name[PATH_MAX];
 733                         struct map *map;
 734                         char *long_name;
 735
 736                         if (dot == NULL || strcmp(dot, ".ko"))
 737                                 continue;
 738                         snprintf(dso_name, sizeof(dso_name), "[%.*s]",
 739                                  (int)(dot - dent->d_name), dent->d_name);
 740
 741                         strxfrchar(dso_name, '-', '_');
 742                         map = map_groups__find_by_name(mg, MAP__FUNCTION,
 743                                                        dso_name);
 744                         if (map == NULL)
 745                                 continue;
 746
 747                         long_name = strdup(path);
 748                         if (long_name == NULL) {
 749                                 ret = -1;
 750                                 goto out;
 751                         }
 752                         dso__set_long_name(map->dso, long_name);
 753                         map->dso->lname_alloc = 1;
 754                         dso__kernel_module_get_build_id(map->dso, "");
 755                 }
 756         }
 757
 758 out:
 759         closedir(dir);
 760         return ret;
 761 }
 762
 763 static int machine__set_modules_path(struct machine *machine)
 764 {
 765         char *version;
 766         char modules_path[PATH_MAX];
 767
 768         version = get_kernel_version(machine->root_dir);
 769         if (!version)
 770                 return -1;
 771
 772         snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s/kernel",
 773                  machine->root_dir, version);
 774         free(version);
 775
 776         return map_groups__set_modules_path_dir(&machine->kmaps, modules_path);
 777 }
 778
 779 static int machine__create_modules(struct machine *machine)
 780 {
 781         char *line = NULL;
 782         size_t n;
 783         FILE *file;
 784         struct map *map;
 785         const char *modules;
 786         char path[PATH_MAX];
 787
 788         if (machine__is_default_guest(machine))
 789                 modules = symbol_conf.default_guest_modules;
 790         else {
 791                 sprintf(path, "%s/proc/modules", machine->root_dir);
 792                 modules = path;
 793         }
 794
 795         if (symbol__restricted_filename(path, "/proc/modules"))
 796                 return -1;
 797
 798         file = fopen(modules, "r");
 799         if (file == NULL)
 800                 return -1;
 801
 802         while (!feof(file)) {
 803                 char name[PATH_MAX];
 804                 u64 start;
 805                 char *sep;
 806                 int line_len;
 807
 808                 line_len = getline(&line, &n, file);
 809                 if (line_len < 0)
 810                         break;
 811
 812                 if (!line)
 813                         goto out_failure;
 814
 815                 line[--line_len] = '\0'; /* \n */
 816
 817                 sep = strrchr(line, 'x');
 818                 if (sep == NULL)
 819                         continue;
 820
 821                 hex2u64(sep + 1, &start);
 822
 823                 sep = strchr(line, ' ');
 824                 if (sep == NULL)
 825                         continue;
 826
 827                 *sep = '\0';
 828
 829                 snprintf(name, sizeof(name), "[%s]", line);
 830                 map = machine__new_module(machine, start, name);
 831                 if (map == NULL)
 832                         goto out_delete_line;
 833                 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
 834         }
 835
 836         free(line);
 837         fclose(file);
 838
 839         if (machine__set_modules_path(machine) < 0) {
 840                 pr_debug("Problems setting modules path maps, continuing anyway...\n");
 841         }
 842         return 0;
 843
 844 out_delete_line:
 845         free(line);
 846 out_failure:
 847         return -1;
 848 }
 849
 850 int machine__create_kernel_maps(struct machine *machine)
 851 {
 852         struct dso *kernel = machine__get_kernel(machine);
 853
 854         if (kernel == NULL ||
 855             __machine__create_kernel_maps(machine, kernel) < 0)
 856                 return -1;
 857
 858         if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
 859                 if (machine__is_host(machine))
 860                         pr_debug("Problems creating module maps, "
 861                                  "continuing anyway...\n");
 862                 else
 863                         pr_debug("Problems creating module maps for guest %d, "
 864                                  "continuing anyway...\n", machine->pid);
 865         }
 866
 867         /*
 868          * Now that we have all the maps created, just set the ->end of them:
 869          */
 870         map_groups__fixup_end(&machine->kmaps);
 871         return 0;
 872 }
 873
 874 static void machine__set_kernel_mmap_len(struct machine *machine,
 875                                          union perf_event *event)
 876 {
 877         int i;
 878
 879         for (i = 0; i < MAP__NR_TYPES; i++) {
 880                 machine->vmlinux_maps[i]->start = event->mmap.start;
 881                 machine->vmlinux_maps[i]->end   = (event->mmap.start +
 882                                                    event->mmap.len);
 883                 /*
 884                  * Be a bit paranoid here, some perf.data file came with
 885                  * a zero sized synthesized MMAP event for the kernel.
 886                  */
 887                 if (machine->vmlinux_maps[i]->end == 0)
 888                         machine->vmlinux_maps[i]->end = ~0ULL;
 889         }
 890 }
 891
 892 static bool machine__uses_kcore(struct machine *machine)
 893 {
 894         struct dso *dso;
 895
 896         list_for_each_entry(dso, &machine->kernel_dsos, node) {
 897                 if (dso__is_kcore(dso))
 898                         return true;
 899         }
 900
 901         return false;
 902 }
 903
 904 static int machine__process_kernel_mmap_event(struct machine *machine,
 905                                               union perf_event *event)
 906 {
 907         struct map *map;
 908         char kmmap_prefix[PATH_MAX];
 909         enum dso_kernel_type kernel_type;
 910         bool is_kernel_mmap;
 911
 912         /* If we have maps from kcore then we do not need or want any others */
 913         if (machine__uses_kcore(machine))
 914                 return 0;
 915
 916         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 917         if (machine__is_host(machine))
 918                 kernel_type = DSO_TYPE_KERNEL;
 919         else
 920                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 921
 922         is_kernel_mmap = memcmp(event->mmap.filename,
 923                                 kmmap_prefix,
 924                                 strlen(kmmap_prefix) - 1) == 0;
 925         if (event->mmap.filename[0] == '/' ||
 926             (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
 927
 928                 char short_module_name[1024];
 929                 char *name, *dot;
 930
 931                 if (event->mmap.filename[0] == '/') {
 932                         name = strrchr(event->mmap.filename, '/');
 933                         if (name == NULL)
 934                                 goto out_problem;
 935
 936                         ++name; /* skip / */
 937                         dot = strrchr(name, '.');
 938                         if (dot == NULL)
 939                                 goto out_problem;
 940                         snprintf(short_module_name, sizeof(short_module_name),
 941                                         "[%.*s]", (int)(dot - name), name);
 942                         strxfrchar(short_module_name, '-', '_');
 943                 } else
 944                         strcpy(short_module_name, event->mmap.filename);
 945
 946                 map = machine__new_module(machine, event->mmap.start,
 947                                           event->mmap.filename);
 948                 if (map == NULL)
 949                         goto out_problem;
 950
 951                 name = strdup(short_module_name);
 952                 if (name == NULL)
 953                         goto out_problem;
 954
 955                 map->dso->short_name = name;
 956                 map->dso->sname_alloc = 1;
 957                 map->end = map->start + event->mmap.len;
 958         } else if (is_kernel_mmap) {
 959                 const char *symbol_name = (event->mmap.filename +
 960                                 strlen(kmmap_prefix));
 961                 /*
 962                  * Should be there already, from the build-id table in
 963                  * the header.
 964                  */
 965                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 966                                                      kmmap_prefix);
 967                 if (kernel == NULL)
 968                         goto out_problem;
 969
 970                 kernel->kernel = kernel_type;
 971                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 972                         goto out_problem;
 973
 974                 machine__set_kernel_mmap_len(machine, event);
 975
 976                 /*
 977                  * Avoid using a zero address (kptr_restrict) for the ref reloc
 978                  * symbol. Effectively having zero here means that at record
 979                  * time /proc/sys/kernel/kptr_restrict was non zero.
 980                  */
 981                 if (event->mmap.pgoff != 0) {
 982                         maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 983                                                          symbol_name,
 984                                                          event->mmap.pgoff);
 985                 }
 986
 987                 if (machine__is_default_guest(machine)) {
 988                         /*
 989                          * preload dso of guest kernel and modules
 990                          */
 991                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
 992                                   NULL);
 993                 }
 994         }
 995         return 0;
 996 out_problem:
 997         return -1;
 998 }
 999
1000 int machine__process_mmap2_event(struct machine *machine,
1001                                  union perf_event *event)
1002 {
1003         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1004         struct thread *thread;
1005         struct map *map;
1006         enum map_type type;
1007         int ret = 0;
1008
1009         if (dump_trace)
1010                 perf_event__fprintf_mmap2(event, stdout);
1011
1012         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1013             cpumode == PERF_RECORD_MISC_KERNEL) {
1014                 ret = machine__process_kernel_mmap_event(machine, event);
1015                 if (ret < 0)
1016                         goto out_problem;
1017                 return 0;
1018         }
1019
1020         thread = machine__findnew_thread(machine, event->mmap2.pid,
1021                                         event->mmap2.pid);
1022         if (thread == NULL)
1023                 goto out_problem;
1024
1025         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1026                 type = MAP__VARIABLE;
1027         else
1028                 type = MAP__FUNCTION;
1029
1030         map = map__new(&machine->user_dsos, event->mmap2.start,
1031                         event->mmap2.len, event->mmap2.pgoff,
1032                         event->mmap2.pid, event->mmap2.maj,
1033                         event->mmap2.min, event->mmap2.ino,
1034                         event->mmap2.ino_generation,
1035                         event->mmap2.filename, type);
1036
1037         if (map == NULL)
1038                 goto out_problem;
1039
1040         thread__insert_map(thread, map);
1041         return 0;
1042
1043 out_problem:
1044         dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1045         return 0;
1046 }
1047
1048 int machine__process_mmap_event(struct machine *machine, union perf_event *event)
1049 {
1050         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1051         struct thread *thread;
1052         struct map *map;
1053         enum map_type type;
1054         int ret = 0;
1055
1056         if (dump_trace)
1057                 perf_event__fprintf_mmap(event, stdout);
1058
1059         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1060             cpumode == PERF_RECORD_MISC_KERNEL) {
1061                 ret = machine__process_kernel_mmap_event(machine, event);
1062                 if (ret < 0)
1063                         goto out_problem;
1064                 return 0;
1065         }
1066
1067         thread = machine__findnew_thread(machine, event->mmap.pid,
1068                                          event->mmap.pid);
1069         if (thread == NULL)
1070                 goto out_problem;
1071
1072         if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1073                 type = MAP__VARIABLE;
1074         else
1075                 type = MAP__FUNCTION;
1076
1077         map = map__new(&machine->user_dsos, event->mmap.start,
1078                         event->mmap.len, event->mmap.pgoff,
1079                         event->mmap.pid, 0, 0, 0, 0,
1080                         event->mmap.filename,
1081                         type);
1082
1083         if (map == NULL)
1084                 goto out_problem;
1085
1086         thread__insert_map(thread, map);
1087         return 0;
1088
1089 out_problem:
1090         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1091         return 0;
1092 }
1093
1094 static void machine__remove_thread(struct machine *machine, struct thread *th)
1095 {
1096         machine->last_match = NULL;
1097         rb_erase(&th->rb_node, &machine->threads);
1098         /*
1099          * We may have references to this thread, for instance in some hist_entry
1100          * instances, so just move them to a separate list.
1101          */
1102         list_add_tail(&th->node, &machine->dead_threads);
1103 }
1104
1105 int machine__process_fork_event(struct machine *machine, union perf_event *event)
1106 {
1107         struct thread *thread = machine__find_thread(machine, event->fork.tid);
1108         struct thread *parent = machine__findnew_thread(machine,
1109                                                         event->fork.ppid,
1110                                                         event->fork.ptid);
1111
1112         /* if a thread currently exists for the thread id remove it */
1113         if (thread != NULL)
1114                 machine__remove_thread(machine, thread);
1115
1116         thread = machine__findnew_thread(machine, event->fork.pid,
1117                                          event->fork.tid);
1118         if (dump_trace)
1119                 perf_event__fprintf_task(event, stdout);
1120
1121         if (thread == NULL || parent == NULL ||
1122             thread__fork(thread, parent) < 0) {
1123                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1124                 return -1;
1125         }
1126
1127         return 0;
1128 }
1129
1130 int machine__process_exit_event(struct machine *machine __maybe_unused,
1131                                 union perf_event *event)
1132 {
1133         struct thread *thread = machine__find_thread(machine, event->fork.tid);
1134
1135         if (dump_trace)
1136                 perf_event__fprintf_task(event, stdout);
1137
1138         if (thread != NULL)
1139                 thread__exited(thread);
1140
1141         return 0;
1142 }
1143
1144 int machine__process_event(struct machine *machine, union perf_event *event)
1145 {
1146         int ret;
1147
1148         switch (event->header.type) {
1149         case PERF_RECORD_COMM:
1150                 ret = machine__process_comm_event(machine, event); break;
1151         case PERF_RECORD_MMAP:
1152                 ret = machine__process_mmap_event(machine, event); break;
1153         case PERF_RECORD_MMAP2:
1154                 ret = machine__process_mmap2_event(machine, event); break;
1155         case PERF_RECORD_FORK:
1156                 ret = machine__process_fork_event(machine, event); break;
1157         case PERF_RECORD_EXIT:
1158                 ret = machine__process_exit_event(machine, event); break;
1159         case PERF_RECORD_LOST:
1160                 ret = machine__process_lost_event(machine, event); break;
1161         default:
1162                 ret = -1;
1163                 break;
1164         }
1165
1166         return ret;
1167 }
1168
1169 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1170 {
1171         if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1172                 return 1;
1173         return 0;
1174 }
1175
1176 static const u8 cpumodes[] = {
1177         PERF_RECORD_MISC_USER,
1178         PERF_RECORD_MISC_KERNEL,
1179         PERF_RECORD_MISC_GUEST_USER,
1180         PERF_RECORD_MISC_GUEST_KERNEL
1181 };
1182 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
1183
1184 static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1185                             struct addr_map_symbol *ams,
1186                             u64 ip)
1187 {
1188         struct addr_location al;
1189         size_t i;
1190         u8 m;
1191
1192         memset(&al, 0, sizeof(al));
1193
1194         for (i = 0; i < NCPUMODES; i++) {
1195                 m = cpumodes[i];
1196                 /*
1197                  * We cannot use the header.misc hint to determine whether a
1198                  * branch stack address is user, kernel, guest, hypervisor.
1199                  * Branches may straddle the kernel/user/hypervisor boundaries.
1200                  * Thus, we have to try consecutively until we find a match
1201                  * or else, the symbol is unknown
1202                  */
1203                 thread__find_addr_location(thread, machine, m, MAP__FUNCTION,
1204                                 ip, &al);
1205                 if (al.sym)
1206                         goto found;
1207         }
1208 found:
1209         ams->addr = ip;
1210         ams->al_addr = al.addr;
1211         ams->sym = al.sym;
1212         ams->map = al.map;
1213 }
1214
1215 static void ip__resolve_data(struct machine *machine, struct thread *thread,
1216                              u8 m, struct addr_map_symbol *ams, u64 addr)
1217 {
1218         struct addr_location al;
1219
1220         memset(&al, 0, sizeof(al));
1221
1222         thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1223                                    &al);
1224         ams->addr = addr;
1225         ams->al_addr = al.addr;
1226         ams->sym = al.sym;
1227         ams->map = al.map;
1228 }
1229
1230 struct mem_info *machine__resolve_mem(struct machine *machine,
1231                                       struct thread *thr,
1232                                       struct perf_sample *sample,
1233                                       u8 cpumode)
1234 {
1235         struct mem_info *mi = zalloc(sizeof(*mi));
1236
1237         if (!mi)
1238                 return NULL;
1239
1240         ip__resolve_ams(machine, thr, &mi->iaddr, sample->ip);
1241         ip__resolve_data(machine, thr, cpumode, &mi->daddr, sample->addr);
1242         mi->data_src.val = sample->data_src;
1243
1244         return mi;
1245 }
1246
1247 struct branch_info *machine__resolve_bstack(struct machine *machine,
1248                                             struct thread *thr,
1249                                             struct branch_stack *bs)
1250 {
1251         struct branch_info *bi;
1252         unsigned int i;
1253
1254         bi = calloc(bs->nr, sizeof(struct branch_info));
1255         if (!bi)
1256                 return NULL;
1257
1258         for (i = 0; i < bs->nr; i++) {
1259                 ip__resolve_ams(machine, thr, &bi[i].to, bs->entries[i].to);
1260                 ip__resolve_ams(machine, thr, &bi[i].from, bs->entries[i].from);
1261                 bi[i].flags = bs->entries[i].flags;
1262         }
1263         return bi;
1264 }
1265
1266 static int machine__resolve_callchain_sample(struct machine *machine,
1267                                              struct thread *thread,
1268                                              struct ip_callchain *chain,
1269                                              struct symbol **parent,
1270                                              struct addr_location *root_al)
1271 {
1272         u8 cpumode = PERF_RECORD_MISC_USER;
1273         unsigned int i;
1274         int err;
1275
1276         callchain_cursor_reset(&callchain_cursor);
1277
1278         if (chain->nr > PERF_MAX_STACK_DEPTH) {
1279                 pr_warning("corrupted callchain. skipping...\n");
1280                 return 0;
1281         }
1282
1283         for (i = 0; i < chain->nr; i++) {
1284                 u64 ip;
1285                 struct addr_location al;
1286
1287                 if (callchain_param.order == ORDER_CALLEE)
1288                         ip = chain->ips[i];
1289                 else
1290                         ip = chain->ips[chain->nr - i - 1];
1291
1292                 if (ip >= PERF_CONTEXT_MAX) {
1293                         switch (ip) {
1294                         case PERF_CONTEXT_HV:
1295                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1296                                 break;
1297                         case PERF_CONTEXT_KERNEL:
1298                                 cpumode = PERF_RECORD_MISC_KERNEL;
1299                                 break;
1300                         case PERF_CONTEXT_USER:
1301                                 cpumode = PERF_RECORD_MISC_USER;
1302                                 break;
1303                         default:
1304                                 pr_debug("invalid callchain context: "
1305                                          "%"PRId64"\n", (s64) ip);
1306                                 /*
1307                                  * It seems the callchain is corrupted.
1308                                  * Discard all.
1309                                  */
1310                                 callchain_cursor_reset(&callchain_cursor);
1311                                 return 0;
1312                         }
1313                         continue;
1314                 }
1315
1316                 al.filtered = false;
1317                 thread__find_addr_location(thread, machine, cpumode,
1318                                            MAP__FUNCTION, ip, &al);
1319                 if (al.sym != NULL) {
1320                         if (sort__has_parent && !*parent &&
1321                             symbol__match_regex(al.sym, &parent_regex))
1322                                 *parent = al.sym;
1323                         else if (have_ignore_callees && root_al &&
1324                           symbol__match_regex(al.sym, &ignore_callees_regex)) {
1325                                 /* Treat this symbol as the root,
1326                                    forgetting its callees. */
1327                                 *root_al = al;
1328                                 callchain_cursor_reset(&callchain_cursor);
1329                         }
1330                         if (!symbol_conf.use_callchain)
1331                                 break;
1332                 }
1333
1334                 err = callchain_cursor_append(&callchain_cursor,
1335                                               ip, al.map, al.sym);
1336                 if (err)
1337                         return err;
1338         }
1339
1340         return 0;
1341 }
1342
1343 static int unwind_entry(struct unwind_entry *entry, void *arg)
1344 {
1345         struct callchain_cursor *cursor = arg;
1346         return callchain_cursor_append(cursor, entry->ip,
1347                                        entry->map, entry->sym);
1348 }
1349
1350 int machine__resolve_callchain(struct machine *machine,
1351                                struct perf_evsel *evsel,
1352                                struct thread *thread,
1353                                struct perf_sample *sample,
1354                                struct symbol **parent,
1355                                struct addr_location *root_al)
1356 {
1357         int ret;
1358
1359         ret = machine__resolve_callchain_sample(machine, thread,
1360                                                 sample->callchain, parent, root_al);
1361         if (ret)
1362                 return ret;
1363
1364         /* Can we do dwarf post unwind? */
1365         if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1366               (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1367                 return 0;
1368
1369         /* Bail out if nothing was captured. */
1370         if ((!sample->user_regs.regs) ||
1371             (!sample->user_stack.size))
1372                 return 0;
1373
1374         return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1375                                    thread, evsel->attr.sample_regs_user,
1376                                    sample);
1377
1378 }