tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include "event.h"
   3 #include "debug.h"
   4 #include "machine.h"
   5 #include "sort.h"
   6 #include "string.h"
   7 #include "strlist.h"
   8 #include "thread.h"
   9 #include "thread_map.h"
  10
  11 static const char *perf_event__names[] = {
  12         [0]                                     = "TOTAL",
  13         [PERF_RECORD_MMAP]                      = "MMAP",
  14         [PERF_RECORD_MMAP2]                     = "MMAP2",
  15         [PERF_RECORD_LOST]                      = "LOST",
  16         [PERF_RECORD_COMM]                      = "COMM",
  17         [PERF_RECORD_EXIT]                      = "EXIT",
  18         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  19         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  20         [PERF_RECORD_FORK]                      = "FORK",
  21         [PERF_RECORD_READ]                      = "READ",
  22         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  23         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  24         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  25         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  26         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  27         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  28 };
  29
  30 const char *perf_event__name(unsigned int id)
  31 {
  32         if (id >= ARRAY_SIZE(perf_event__names))
  33                 return "INVALID";
  34         if (!perf_event__names[id])
  35                 return "UNKNOWN";
  36         return perf_event__names[id];
  37 }
  38
  39 static struct perf_sample synth_sample = {
  40         .pid       = -1,
  41         .tid       = -1,
  42         .time      = -1,
  43         .stream_id = -1,
  44         .cpu       = -1,
  45         .period    = 1,
  46 };
  47
  48 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
  49 {
  50         char filename[PATH_MAX];
  51         char bf[BUFSIZ];
  52         FILE *fp;
  53         size_t size = 0;
  54         pid_t tgid = -1;
  55
  56         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  57
  58         fp = fopen(filename, "r");
  59         if (fp == NULL) {
  60                 pr_debug("couldn't open %s\n", filename);
  61                 return 0;
  62         }
  63
  64         while (!comm[0] || (tgid < 0)) {
  65                 if (fgets(bf, sizeof(bf), fp) == NULL) {
  66                         pr_warning("couldn't get COMM and pgid, malformed %s\n",
  67                                    filename);
  68                         break;
  69                 }
  70
  71                 if (memcmp(bf, "Name:", 5) == 0) {
  72                         char *name = bf + 5;
  73                         while (*name && isspace(*name))
  74                                 ++name;
  75                         size = strlen(name) - 1;
  76                         if (size >= len)
  77                                 size = len - 1;
  78                         memcpy(comm, name, size);
  79                         comm[size] = '\0';
  80
  81                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  82                         char *tgids = bf + 5;
  83                         while (*tgids && isspace(*tgids))
  84                                 ++tgids;
  85                         tgid = atoi(tgids);
  86                 }
  87         }
  88
  89         fclose(fp);
  90
  91         return tgid;
  92 }
  93
  94 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
  95                                          union perf_event *event, pid_t pid,
  96                                          int full,
  97                                          perf_event__handler_t process,
  98                                          struct machine *machine)
  99 {
 100         char filename[PATH_MAX];
 101         size_t size;
 102         DIR *tasks;
 103         struct dirent dirent, *next;
 104         pid_t tgid;
 105
 106         memset(&event->comm, 0, sizeof(event->comm));
 107
 108         tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
 109                                          sizeof(event->comm.comm));
 110         if (tgid < 0)
 111                 goto out;
 112
 113         event->comm.pid = tgid;
 114         event->comm.header.type = PERF_RECORD_COMM;
 115
 116         size = strlen(event->comm.comm) + 1;
 117         size = PERF_ALIGN(size, sizeof(u64));
 118         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 119         event->comm.header.size = (sizeof(event->comm) -
 120                                 (sizeof(event->comm.comm) - size) +
 121                                 machine->id_hdr_size);
 122         if (!full) {
 123                 event->comm.tid = pid;
 124
 125                 if (process(tool, event, &synth_sample, machine) != 0)
 126                         return -1;
 127
 128                 goto out;
 129         }
 130
 131         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
 132
 133         tasks = opendir(filename);
 134         if (tasks == NULL) {
 135                 pr_debug("couldn't open %s\n", filename);
 136                 return 0;
 137         }
 138
 139         while (!readdir_r(tasks, &dirent, &next) && next) {
 140                 char *end;
 141                 pid = strtol(dirent.d_name, &end, 10);
 142                 if (*end)
 143                         continue;
 144
 145                 /* already have tgid; jut want to update the comm */
 146                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
 147                                          sizeof(event->comm.comm));
 148
 149                 size = strlen(event->comm.comm) + 1;
 150                 size = PERF_ALIGN(size, sizeof(u64));
 151                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
 152                 event->comm.header.size = (sizeof(event->comm) -
 153                                           (sizeof(event->comm.comm) - size) +
 154                                           machine->id_hdr_size);
 155
 156                 event->comm.tid = pid;
 157
 158                 if (process(tool, event, &synth_sample, machine) != 0) {
 159                         tgid = -1;
 160                         break;
 161                 }
 162         }
 163
 164         closedir(tasks);
 165 out:
 166         return tgid;
 167 }
 168
 169 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 170                                               union perf_event *event,
 171                                               pid_t pid, pid_t tgid,
 172                                               perf_event__handler_t process,
 173                                               struct machine *machine)
 174 {
 175         char filename[PATH_MAX];
 176         FILE *fp;
 177         int rc = 0;
 178
 179         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
 180
 181         fp = fopen(filename, "r");
 182         if (fp == NULL) {
 183                 /*
 184                  * We raced with a task exiting - just return:
 185                  */
 186                 pr_debug("couldn't open %s\n", filename);
 187                 return -1;
 188         }
 189
 190         event->header.type = PERF_RECORD_MMAP;
 191         /*
 192          * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 193          */
 194         event->header.misc = PERF_RECORD_MISC_USER;
 195
 196         while (1) {
 197                 char bf[BUFSIZ];
 198                 char prot[5];
 199                 char execname[PATH_MAX];
 200                 char anonstr[] = "//anon";
 201                 size_t size;
 202                 ssize_t n;
 203
 204                 if (fgets(bf, sizeof(bf), fp) == NULL)
 205                         break;
 206
 207                 /* ensure null termination since stack will be reused. */
 208                 strcpy(execname, "");
 209
 210                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 211                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
 212                        &event->mmap.start, &event->mmap.len, prot,
 213                        &event->mmap.pgoff,
 214                        execname);
 215
 216                 if (n != 5)
 217                         continue;
 218
 219                 if (prot[2] != 'x')
 220                         continue;
 221
 222                 if (!strcmp(execname, ""))
 223                         strcpy(execname, anonstr);
 224
 225                 size = strlen(execname) + 1;
 226                 memcpy(event->mmap.filename, execname, size);
 227                 size = PERF_ALIGN(size, sizeof(u64));
 228                 event->mmap.len -= event->mmap.start;
 229                 event->mmap.header.size = (sizeof(event->mmap) -
 230                                         (sizeof(event->mmap.filename) - size));
 231                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 232                 event->mmap.header.size += machine->id_hdr_size;
 233                 event->mmap.pid = tgid;
 234                 event->mmap.tid = pid;
 235
 236                 if (process(tool, event, &synth_sample, machine) != 0) {
 237                         rc = -1;
 238                         break;
 239                 }
 240         }
 241
 242         fclose(fp);
 243         return rc;
 244 }
 245
 246 int perf_event__synthesize_modules(struct perf_tool *tool,
 247                                    perf_event__handler_t process,
 248                                    struct machine *machine)
 249 {
 250         int rc = 0;
 251         struct rb_node *nd;
 252         struct map_groups *kmaps = &machine->kmaps;
 253         union perf_event *event = zalloc((sizeof(event->mmap) +
 254                                           machine->id_hdr_size));
 255         if (event == NULL) {
 256                 pr_debug("Not enough memory synthesizing mmap event "
 257                          "for kernel modules\n");
 258                 return -1;
 259         }
 260
 261         event->header.type = PERF_RECORD_MMAP;
 262
 263         /*
 264          * kernel uses 0 for user space maps, see kernel/perf_event.c
 265          * __perf_event_mmap
 266          */
 267         if (machine__is_host(machine))
 268                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 269         else
 270                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 271
 272         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 273              nd; nd = rb_next(nd)) {
 274                 size_t size;
 275                 struct map *pos = rb_entry(nd, struct map, rb_node);
 276
 277                 if (pos->dso->kernel)
 278                         continue;
 279
 280                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 281                 event->mmap.header.type = PERF_RECORD_MMAP;
 282                 event->mmap.header.size = (sizeof(event->mmap) -
 283                                         (sizeof(event->mmap.filename) - size));
 284                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 285                 event->mmap.header.size += machine->id_hdr_size;
 286                 event->mmap.start = pos->start;
 287                 event->mmap.len   = pos->end - pos->start;
 288                 event->mmap.pid   = machine->pid;
 289
 290                 memcpy(event->mmap.filename, pos->dso->long_name,
 291                        pos->dso->long_name_len + 1);
 292                 if (process(tool, event, &synth_sample, machine) != 0) {
 293                         rc = -1;
 294                         break;
 295                 }
 296         }
 297
 298         free(event);
 299         return rc;
 300 }
 301
 302 static int __event__synthesize_thread(union perf_event *comm_event,
 303                                       union perf_event *mmap_event,
 304                                       pid_t pid, int full,
 305                                           perf_event__handler_t process,
 306                                       struct perf_tool *tool,
 307                                       struct machine *machine)
 308 {
 309         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 310                                                  process, machine);
 311         if (tgid == -1)
 312                 return -1;
 313         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 314                                                   process, machine);
 315 }
 316
 317 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 318                                       struct thread_map *threads,
 319                                       perf_event__handler_t process,
 320                                       struct machine *machine)
 321 {
 322         union perf_event *comm_event, *mmap_event;
 323         int err = -1, thread, j;
 324
 325         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 326         if (comm_event == NULL)
 327                 goto out;
 328
 329         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 330         if (mmap_event == NULL)
 331                 goto out_free_comm;
 332
 333         err = 0;
 334         for (thread = 0; thread < threads->nr; ++thread) {
 335                 if (__event__synthesize_thread(comm_event, mmap_event,
 336                                                threads->map[thread], 0,
 337                                                process, tool, machine)) {
 338                         err = -1;
 339                         break;
 340                 }
 341
 342                 /*
 343                  * comm.pid is set to thread group id by
 344                  * perf_event__synthesize_comm
 345                  */
 346                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 347                         bool need_leader = true;
 348
 349                         /* is thread group leader in thread_map? */
 350                         for (j = 0; j < threads->nr; ++j) {
 351                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 352                                         need_leader = false;
 353                                         break;
 354                                 }
 355                         }
 356
 357                         /* if not, generate events for it */
 358                         if (need_leader &&
 359                             __event__synthesize_thread(comm_event,
 360                                                       mmap_event,
 361                                                       comm_event->comm.pid, 0,
 362                                                       process, tool, machine)) {
 363                                 err = -1;
 364                                 break;
 365                         }
 366                 }
 367         }
 368         free(mmap_event);
 369 out_free_comm:
 370         free(comm_event);
 371 out:
 372         return err;
 373 }
 374
 375 int perf_event__synthesize_threads(struct perf_tool *tool,
 376                                    perf_event__handler_t process,
 377                                    struct machine *machine)
 378 {
 379         DIR *proc;
 380         struct dirent dirent, *next;
 381         union perf_event *comm_event, *mmap_event;
 382         int err = -1;
 383
 384         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 385         if (comm_event == NULL)
 386                 goto out;
 387
 388         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 389         if (mmap_event == NULL)
 390                 goto out_free_comm;
 391
 392         proc = opendir("/proc");
 393         if (proc == NULL)
 394                 goto out_free_mmap;
 395
 396         while (!readdir_r(proc, &dirent, &next) && next) {
 397                 char *end;
 398                 pid_t pid = strtol(dirent.d_name, &end, 10);
 399
 400                 if (*end) /* only interested in proper numerical dirents */
 401                         continue;
 402                 /*
 403                  * We may race with exiting thread, so don't stop just because
 404                  * one thread couldn't be synthesized.
 405                  */
 406                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 407                                            process, tool, machine);
 408         }
 409
 410         err = 0;
 411         closedir(proc);
 412 out_free_mmap:
 413         free(mmap_event);
 414 out_free_comm:
 415         free(comm_event);
 416 out:
 417         return err;
 418 }
 419
 420 struct process_symbol_args {
 421         const char *name;
 422         u64        start;
 423 };
 424
 425 static int find_symbol_cb(void *arg, const char *name, char type,
 426                           u64 start)
 427 {
 428         struct process_symbol_args *args = arg;
 429
 430         /*
 431          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 432          * an 'A' to the same address as "_stext".
 433          */
 434         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 435               type == 'A') || strcmp(name, args->name))
 436                 return 0;
 437
 438         args->start = start;
 439         return 1;
 440 }
 441
 442 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 443                                        perf_event__handler_t process,
 444                                        struct machine *machine,
 445                                        const char *symbol_name)
 446 {
 447         size_t size;
 448         const char *filename, *mmap_name;
 449         char path[PATH_MAX];
 450         char name_buff[PATH_MAX];
 451         struct map *map;
 452         int err;
 453         /*
 454          * We should get this from /sys/kernel/sections/.text, but till that is
 455          * available use this, and after it is use this as a fallback for older
 456          * kernels.
 457          */
 458         struct process_symbol_args args = { .name = symbol_name, };
 459         union perf_event *event = zalloc((sizeof(event->mmap) +
 460                                           machine->id_hdr_size));
 461         if (event == NULL) {
 462                 pr_debug("Not enough memory synthesizing mmap event "
 463                          "for kernel modules\n");
 464                 return -1;
 465         }
 466
 467         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 468         if (machine__is_host(machine)) {
 469                 /*
 470                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 471                  * see kernel/perf_event.c __perf_event_mmap
 472                  */
 473                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 474                 filename = "/proc/kallsyms";
 475         } else {
 476                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 477                 if (machine__is_default_guest(machine))
 478                         filename = (char *) symbol_conf.default_guest_kallsyms;
 479                 else {
 480                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 481                         filename = path;
 482                 }
 483         }
 484
 485         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
 486                 free(event);
 487                 return -ENOENT;
 488         }
 489
 490         map = machine->vmlinux_maps[MAP__FUNCTION];
 491         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 492                         "%s%s", mmap_name, symbol_name) + 1;
 493         size = PERF_ALIGN(size, sizeof(u64));
 494         event->mmap.header.type = PERF_RECORD_MMAP;
 495         event->mmap.header.size = (sizeof(event->mmap) -
 496                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 497         event->mmap.pgoff = args.start;
 498         event->mmap.start = map->start;
 499         event->mmap.len   = map->end - event->mmap.start;
 500         event->mmap.pid   = machine->pid;
 501
 502         err = process(tool, event, &synth_sample, machine);
 503         free(event);
 504
 505         return err;
 506 }
 507
 508 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 509 {
 510         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 511 }
 512
 513 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 514                              union perf_event *event,
 515                              struct perf_sample *sample __maybe_unused,
 516                              struct machine *machine)
 517 {
 518         return machine__process_comm_event(machine, event);
 519 }
 520
 521 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 522                              union perf_event *event,
 523                              struct perf_sample *sample __maybe_unused,
 524                              struct machine *machine)
 525 {
 526         return machine__process_lost_event(machine, event);
 527 }
 528
 529 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 530 {
 531         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
 532                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 533                        event->mmap.len, event->mmap.pgoff, event->mmap.filename);
 534 }
 535
 536 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 537 {
 538         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 539                            " %02x:%02x %"PRIu64" %"PRIu64"]: %s\n",
 540                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 541                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 542                        event->mmap2.min, event->mmap2.ino,
 543                        event->mmap2.ino_generation,
 544                        event->mmap2.filename);
 545 }
 546
 547 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 548                              union perf_event *event,
 549                              struct perf_sample *sample __maybe_unused,
 550                              struct machine *machine)
 551 {
 552         return machine__process_mmap_event(machine, event);
 553 }
 554
 555 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 556                              union perf_event *event,
 557                              struct perf_sample *sample __maybe_unused,
 558                              struct machine *machine)
 559 {
 560         return machine__process_mmap2_event(machine, event);
 561 }
 562
 563 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 564 {
 565         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 566                        event->fork.pid, event->fork.tid,
 567                        event->fork.ppid, event->fork.ptid);
 568 }
 569
 570 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 571                              union perf_event *event,
 572                              struct perf_sample *sample __maybe_unused,
 573                              struct machine *machine)
 574 {
 575         return machine__process_fork_event(machine, event);
 576 }
 577
 578 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 579                              union perf_event *event,
 580                              struct perf_sample *sample __maybe_unused,
 581                              struct machine *machine)
 582 {
 583         return machine__process_exit_event(machine, event);
 584 }
 585
 586 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 587 {
 588         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 589                              perf_event__name(event->header.type));
 590
 591         switch (event->header.type) {
 592         case PERF_RECORD_COMM:
 593                 ret += perf_event__fprintf_comm(event, fp);
 594                 break;
 595         case PERF_RECORD_FORK:
 596         case PERF_RECORD_EXIT:
 597                 ret += perf_event__fprintf_task(event, fp);
 598                 break;
 599         case PERF_RECORD_MMAP:
 600                 ret += perf_event__fprintf_mmap(event, fp);
 601                 break;
 602         case PERF_RECORD_MMAP2:
 603                 ret += perf_event__fprintf_mmap2(event, fp);
 604                 break;
 605         default:
 606                 ret += fprintf(fp, "\n");
 607         }
 608
 609         return ret;
 610 }
 611
 612 int perf_event__process(struct perf_tool *tool __maybe_unused,
 613                         union perf_event *event,
 614                         struct perf_sample *sample __maybe_unused,
 615                         struct machine *machine)
 616 {
 617         return machine__process_event(machine, event);
 618 }
 619
 620 void thread__find_addr_map(struct thread *self,
 621                            struct machine *machine, u8 cpumode,
 622                            enum map_type type, u64 addr,
 623                            struct addr_location *al)
 624 {
 625         struct map_groups *mg = &self->mg;
 626         bool load_map = false;
 627
 628         al->thread = self;
 629         al->addr = addr;
 630         al->cpumode = cpumode;
 631         al->filtered = false;
 632
 633         if (machine == NULL) {
 634                 al->map = NULL;
 635                 return;
 636         }
 637
 638         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 639                 al->level = 'k';
 640                 mg = &machine->kmaps;
 641                 load_map = true;
 642         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 643                 al->level = '.';
 644         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 645                 al->level = 'g';
 646                 mg = &machine->kmaps;
 647                 load_map = true;
 648         } else {
 649                 /*
 650                  * 'u' means guest os user space.
 651                  * TODO: We don't support guest user space. Might support late.
 652                  */
 653                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
 654                         al->level = 'u';
 655                 else
 656                         al->level = 'H';
 657                 al->map = NULL;
 658
 659                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 660                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 661                         !perf_guest)
 662                         al->filtered = true;
 663                 if ((cpumode == PERF_RECORD_MISC_USER ||
 664                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 665                         !perf_host)
 666                         al->filtered = true;
 667
 668                 return;
 669         }
 670 try_again:
 671         al->map = map_groups__find(mg, type, al->addr);
 672         if (al->map == NULL) {
 673                 /*
 674                  * If this is outside of all known maps, and is a negative
 675                  * address, try to look it up in the kernel dso, as it might be
 676                  * a vsyscall or vdso (which executes in user-mode).
 677                  *
 678                  * XXX This is nasty, we should have a symbol list in the
 679                  * "[vdso]" dso, but for now lets use the old trick of looking
 680                  * in the whole kernel symbol list.
 681                  */
 682                 if ((long long)al->addr < 0 &&
 683                     cpumode == PERF_RECORD_MISC_USER &&
 684                     machine && mg != &machine->kmaps) {
 685                         mg = &machine->kmaps;
 686                         goto try_again;
 687                 }
 688         } else {
 689                 /*
 690                  * Kernel maps might be changed when loading symbols so loading
 691                  * must be done prior to using kernel maps.
 692                  */
 693                 if (load_map)
 694                         map__load(al->map, machine->symbol_filter);
 695                 al->addr = al->map->map_ip(al->map, al->addr);
 696         }
 697 }
 698
 699 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 700                                 u8 cpumode, enum map_type type, u64 addr,
 701                                 struct addr_location *al)
 702 {
 703         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 704         if (al->map != NULL)
 705                 al->sym = map__find_symbol(al->map, al->addr,
 706                                            machine->symbol_filter);
 707         else
 708                 al->sym = NULL;
 709 }
 710
 711 int perf_event__preprocess_sample(const union perf_event *event,
 712                                   struct machine *machine,
 713                                   struct addr_location *al,
 714                                   struct perf_sample *sample)
 715 {
 716         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 717         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 718                                                         sample->pid);
 719
 720         if (thread == NULL)
 721                 return -1;
 722
 723         if (symbol_conf.comm_list &&
 724             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 725                 goto out_filtered;
 726
 727         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->tid);
 728         /*
 729          * Have we already created the kernel maps for this machine?
 730          *
 731          * This should have happened earlier, when we processed the kernel MMAP
 732          * events, but for older perf.data files there was no such thing, so do
 733          * it now.
 734          */
 735         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 736             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 737                 machine__create_kernel_maps(machine);
 738
 739         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 740                               sample->ip, al);
 741         dump_printf(" ...... dso: %s\n",
 742                     al->map ? al->map->dso->long_name :
 743                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 744         al->sym = NULL;
 745         al->cpu = sample->cpu;
 746
 747         if (al->map) {
 748                 struct dso *dso = al->map->dso;
 749
 750                 if (symbol_conf.dso_list &&
 751                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 752                                                   dso->short_name) ||
 753                                (dso->short_name != dso->long_name &&
 754                                 strlist__has_entry(symbol_conf.dso_list,
 755                                                    dso->long_name)))))
 756                         goto out_filtered;
 757
 758                 al->sym = map__find_symbol(al->map, al->addr,
 759                                            machine->symbol_filter);
 760         }
 761
 762         if (symbol_conf.sym_list &&
 763                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
 764                                                 al->sym->name)))
 765                 goto out_filtered;
 766
 767         return 0;
 768
 769 out_filtered:
 770         al->filtered = true;
 771         return 0;
 772 }