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