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 #include "symbol/kallsyms.h"
  11
  12 static const char *perf_event__names[] = {
  13         [0]                                     = "TOTAL",
  14         [PERF_RECORD_MMAP]                      = "MMAP",
  15         [PERF_RECORD_MMAP2]                     = "MMAP2",
  16         [PERF_RECORD_LOST]                      = "LOST",
  17         [PERF_RECORD_COMM]                      = "COMM",
  18         [PERF_RECORD_EXIT]                      = "EXIT",
  19         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  20         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  21         [PERF_RECORD_FORK]                      = "FORK",
  22         [PERF_RECORD_READ]                      = "READ",
  23         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  24         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  25         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  26         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  27         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  28         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  29 };
  30
  31 const char *perf_event__name(unsigned int id)
  32 {
  33         if (id >= ARRAY_SIZE(perf_event__names))
  34                 return "INVALID";
  35         if (!perf_event__names[id])
  36                 return "UNKNOWN";
  37         return perf_event__names[id];
  38 }
  39
  40 static struct perf_sample synth_sample = {
  41         .pid       = -1,
  42         .tid       = -1,
  43         .time      = -1,
  44         .stream_id = -1,
  45         .cpu       = -1,
  46         .period    = 1,
  47 };
  48
  49 static pid_t perf_event__get_comm_tgid(pid_t pid, char *comm, size_t len)
  50 {
  51         char filename[PATH_MAX];
  52         char bf[BUFSIZ];
  53         FILE *fp;
  54         size_t size = 0;
  55         pid_t tgid = -1;
  56
  57         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  58
  59         fp = fopen(filename, "r");
  60         if (fp == NULL) {
  61                 pr_debug("couldn't open %s\n", filename);
  62                 return 0;
  63         }
  64
  65         while (!comm[0] || (tgid < 0)) {
  66                 if (fgets(bf, sizeof(bf), fp) == NULL) {
  67                         pr_warning("couldn't get COMM and pgid, malformed %s\n",
  68                                    filename);
  69                         break;
  70                 }
  71
  72                 if (memcmp(bf, "Name:", 5) == 0) {
  73                         char *name = bf + 5;
  74                         while (*name && isspace(*name))
  75                                 ++name;
  76                         size = strlen(name) - 1;
  77                         if (size >= len)
  78                                 size = len - 1;
  79                         memcpy(comm, name, size);
  80                         comm[size] = '\0';
  81
  82                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  83                         char *tgids = bf + 5;
  84                         while (*tgids && isspace(*tgids))
  85                                 ++tgids;
  86                         tgid = atoi(tgids);
  87                 }
  88         }
  89
  90         fclose(fp);
  91
  92         return tgid;
  93 }
  94
  95 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
  96                                          union perf_event *event, pid_t pid,
  97                                          int full,
  98                                          perf_event__handler_t process,
  99                                          struct machine *machine)
 100 {
 101         char filename[PATH_MAX];
 102         size_t size;
 103         DIR *tasks;
 104         struct dirent dirent, *next;
 105         pid_t tgid;
 106
 107         memset(&event->comm, 0, sizeof(event->comm));
 108
 109         tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
 110                                          sizeof(event->comm.comm));
 111         if (tgid < 0)
 112                 goto out;
 113
 114         event->comm.pid = tgid;
 115         event->comm.header.type = PERF_RECORD_COMM;
 116
 117         size = strlen(event->comm.comm) + 1;
 118         size = PERF_ALIGN(size, sizeof(u64));
 119         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 120         event->comm.header.size = (sizeof(event->comm) -
 121                                 (sizeof(event->comm.comm) - size) +
 122                                 machine->id_hdr_size);
 123         if (!full) {
 124                 event->comm.tid = pid;
 125
 126                 if (process(tool, event, &synth_sample, machine) != 0)
 127                         return -1;
 128
 129                 goto out;
 130         }
 131
 132         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 133                  machine->root_dir, pid);
 134
 135         tasks = opendir(filename);
 136         if (tasks == NULL) {
 137                 pr_debug("couldn't open %s\n", filename);
 138                 return 0;
 139         }
 140
 141         while (!readdir_r(tasks, &dirent, &next) && next) {
 142                 char *end;
 143                 pid = strtol(dirent.d_name, &end, 10);
 144                 if (*end)
 145                         continue;
 146
 147                 /* already have tgid; jut want to update the comm */
 148                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
 149                                          sizeof(event->comm.comm));
 150
 151                 size = strlen(event->comm.comm) + 1;
 152                 size = PERF_ALIGN(size, sizeof(u64));
 153                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
 154                 event->comm.header.size = (sizeof(event->comm) -
 155                                           (sizeof(event->comm.comm) - size) +
 156                                           machine->id_hdr_size);
 157
 158                 event->comm.tid = pid;
 159
 160                 if (process(tool, event, &synth_sample, machine) != 0) {
 161                         tgid = -1;
 162                         break;
 163                 }
 164         }
 165
 166         closedir(tasks);
 167 out:
 168         return tgid;
 169 }
 170
 171 static int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 172                                               union perf_event *event,
 173                                               pid_t pid, pid_t tgid,
 174                                               perf_event__handler_t process,
 175                                               struct machine *machine,
 176                                               bool mmap_data)
 177 {
 178         char filename[PATH_MAX];
 179         FILE *fp;
 180         int rc = 0;
 181
 182         snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
 183                  machine->root_dir, pid);
 184
 185         fp = fopen(filename, "r");
 186         if (fp == NULL) {
 187                 /*
 188                  * We raced with a task exiting - just return:
 189                  */
 190                 pr_debug("couldn't open %s\n", filename);
 191                 return -1;
 192         }
 193
 194         event->header.type = PERF_RECORD_MMAP;
 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                  * Anon maps don't have the execname.
 217                  */
 218                 if (n < 4)
 219                         continue;
 220                 /*
 221                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 222                  */
 223                 if (machine__is_host(machine))
 224                         event->header.misc = PERF_RECORD_MISC_USER;
 225                 else
 226                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 227
 228                 if (prot[2] != 'x') {
 229                         if (!mmap_data || prot[0] != 'r')
 230                                 continue;
 231
 232                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 233                 }
 234
 235                 if (!strcmp(execname, ""))
 236                         strcpy(execname, anonstr);
 237
 238                 size = strlen(execname) + 1;
 239                 memcpy(event->mmap.filename, execname, size);
 240                 size = PERF_ALIGN(size, sizeof(u64));
 241                 event->mmap.len -= event->mmap.start;
 242                 event->mmap.header.size = (sizeof(event->mmap) -
 243                                         (sizeof(event->mmap.filename) - size));
 244                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 245                 event->mmap.header.size += machine->id_hdr_size;
 246                 event->mmap.pid = tgid;
 247                 event->mmap.tid = pid;
 248
 249                 if (process(tool, event, &synth_sample, machine) != 0) {
 250                         rc = -1;
 251                         break;
 252                 }
 253         }
 254
 255         fclose(fp);
 256         return rc;
 257 }
 258
 259 int perf_event__synthesize_modules(struct perf_tool *tool,
 260                                    perf_event__handler_t process,
 261                                    struct machine *machine)
 262 {
 263         int rc = 0;
 264         struct rb_node *nd;
 265         struct map_groups *kmaps = &machine->kmaps;
 266         union perf_event *event = zalloc((sizeof(event->mmap) +
 267                                           machine->id_hdr_size));
 268         if (event == NULL) {
 269                 pr_debug("Not enough memory synthesizing mmap event "
 270                          "for kernel modules\n");
 271                 return -1;
 272         }
 273
 274         event->header.type = PERF_RECORD_MMAP;
 275
 276         /*
 277          * kernel uses 0 for user space maps, see kernel/perf_event.c
 278          * __perf_event_mmap
 279          */
 280         if (machine__is_host(machine))
 281                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 282         else
 283                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 284
 285         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 286              nd; nd = rb_next(nd)) {
 287                 size_t size;
 288                 struct map *pos = rb_entry(nd, struct map, rb_node);
 289
 290                 if (pos->dso->kernel)
 291                         continue;
 292
 293                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 294                 event->mmap.header.type = PERF_RECORD_MMAP;
 295                 event->mmap.header.size = (sizeof(event->mmap) -
 296                                         (sizeof(event->mmap.filename) - size));
 297                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 298                 event->mmap.header.size += machine->id_hdr_size;
 299                 event->mmap.start = pos->start;
 300                 event->mmap.len   = pos->end - pos->start;
 301                 event->mmap.pid   = machine->pid;
 302
 303                 memcpy(event->mmap.filename, pos->dso->long_name,
 304                        pos->dso->long_name_len + 1);
 305                 if (process(tool, event, &synth_sample, machine) != 0) {
 306                         rc = -1;
 307                         break;
 308                 }
 309         }
 310
 311         free(event);
 312         return rc;
 313 }
 314
 315 static int __event__synthesize_thread(union perf_event *comm_event,
 316                                       union perf_event *mmap_event,
 317                                       pid_t pid, int full,
 318                                           perf_event__handler_t process,
 319                                       struct perf_tool *tool,
 320                                       struct machine *machine, bool mmap_data)
 321 {
 322         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 323                                                  process, machine);
 324         if (tgid == -1)
 325                 return -1;
 326         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 327                                                   process, machine, mmap_data);
 328 }
 329
 330 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 331                                       struct thread_map *threads,
 332                                       perf_event__handler_t process,
 333                                       struct machine *machine,
 334                                       bool mmap_data)
 335 {
 336         union perf_event *comm_event, *mmap_event;
 337         int err = -1, thread, j;
 338
 339         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 340         if (comm_event == NULL)
 341                 goto out;
 342
 343         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 344         if (mmap_event == NULL)
 345                 goto out_free_comm;
 346
 347         err = 0;
 348         for (thread = 0; thread < threads->nr; ++thread) {
 349                 if (__event__synthesize_thread(comm_event, mmap_event,
 350                                                threads->map[thread], 0,
 351                                                process, tool, machine,
 352                                                mmap_data)) {
 353                         err = -1;
 354                         break;
 355                 }
 356
 357                 /*
 358                  * comm.pid is set to thread group id by
 359                  * perf_event__synthesize_comm
 360                  */
 361                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 362                         bool need_leader = true;
 363
 364                         /* is thread group leader in thread_map? */
 365                         for (j = 0; j < threads->nr; ++j) {
 366                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 367                                         need_leader = false;
 368                                         break;
 369                                 }
 370                         }
 371
 372                         /* if not, generate events for it */
 373                         if (need_leader &&
 374                             __event__synthesize_thread(comm_event, mmap_event,
 375                                                        comm_event->comm.pid, 0,
 376                                                        process, tool, machine,
 377                                                        mmap_data)) {
 378                                 err = -1;
 379                                 break;
 380                         }
 381                 }
 382         }
 383         free(mmap_event);
 384 out_free_comm:
 385         free(comm_event);
 386 out:
 387         return err;
 388 }
 389
 390 int perf_event__synthesize_threads(struct perf_tool *tool,
 391                                    perf_event__handler_t process,
 392                                    struct machine *machine, bool mmap_data)
 393 {
 394         DIR *proc;
 395         char proc_path[PATH_MAX];
 396         struct dirent dirent, *next;
 397         union perf_event *comm_event, *mmap_event;
 398         int err = -1;
 399
 400         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 401         if (comm_event == NULL)
 402                 goto out;
 403
 404         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 405         if (mmap_event == NULL)
 406                 goto out_free_comm;
 407
 408         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 409         proc = opendir(proc_path);
 410
 411         if (proc == NULL)
 412                 goto out_free_mmap;
 413
 414         while (!readdir_r(proc, &dirent, &next) && next) {
 415                 char *end;
 416                 pid_t pid = strtol(dirent.d_name, &end, 10);
 417
 418                 if (*end) /* only interested in proper numerical dirents */
 419                         continue;
 420                 /*
 421                  * We may race with exiting thread, so don't stop just because
 422                  * one thread couldn't be synthesized.
 423                  */
 424                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 425                                            process, tool, machine, mmap_data);
 426         }
 427
 428         err = 0;
 429         closedir(proc);
 430 out_free_mmap:
 431         free(mmap_event);
 432 out_free_comm:
 433         free(comm_event);
 434 out:
 435         return err;
 436 }
 437
 438 struct process_symbol_args {
 439         const char *name;
 440         u64        start;
 441 };
 442
 443 static int find_symbol_cb(void *arg, const char *name, char type,
 444                           u64 start)
 445 {
 446         struct process_symbol_args *args = arg;
 447
 448         /*
 449          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 450          * an 'A' to the same address as "_stext".
 451          */
 452         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 453               type == 'A') || strcmp(name, args->name))
 454                 return 0;
 455
 456         args->start = start;
 457         return 1;
 458 }
 459
 460 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 461                                        perf_event__handler_t process,
 462                                        struct machine *machine,
 463                                        const char *symbol_name)
 464 {
 465         size_t size;
 466         const char *filename, *mmap_name;
 467         char path[PATH_MAX];
 468         char name_buff[PATH_MAX];
 469         struct map *map;
 470         int err;
 471         /*
 472          * We should get this from /sys/kernel/sections/.text, but till that is
 473          * available use this, and after it is use this as a fallback for older
 474          * kernels.
 475          */
 476         struct process_symbol_args args = { .name = symbol_name, };
 477         union perf_event *event = zalloc((sizeof(event->mmap) +
 478                                           machine->id_hdr_size));
 479         if (event == NULL) {
 480                 pr_debug("Not enough memory synthesizing mmap event "
 481                          "for kernel modules\n");
 482                 return -1;
 483         }
 484
 485         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 486         if (machine__is_host(machine)) {
 487                 /*
 488                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 489                  * see kernel/perf_event.c __perf_event_mmap
 490                  */
 491                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 492                 filename = "/proc/kallsyms";
 493         } else {
 494                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 495                 if (machine__is_default_guest(machine))
 496                         filename = (char *) symbol_conf.default_guest_kallsyms;
 497                 else {
 498                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 499                         filename = path;
 500                 }
 501         }
 502
 503         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
 504                 free(event);
 505                 return -ENOENT;
 506         }
 507
 508         map = machine->vmlinux_maps[MAP__FUNCTION];
 509         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 510                         "%s%s", mmap_name, symbol_name) + 1;
 511         size = PERF_ALIGN(size, sizeof(u64));
 512         event->mmap.header.type = PERF_RECORD_MMAP;
 513         event->mmap.header.size = (sizeof(event->mmap) -
 514                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 515         event->mmap.pgoff = args.start;
 516         event->mmap.start = map->start;
 517         event->mmap.len   = map->end - event->mmap.start;
 518         event->mmap.pid   = machine->pid;
 519
 520         err = process(tool, event, &synth_sample, machine);
 521         free(event);
 522
 523         return err;
 524 }
 525
 526 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 527 {
 528         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 529 }
 530
 531 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 532                              union perf_event *event,
 533                              struct perf_sample *sample,
 534                              struct machine *machine)
 535 {
 536         return machine__process_comm_event(machine, event, sample);
 537 }
 538
 539 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 540                              union perf_event *event,
 541                              struct perf_sample *sample,
 542                              struct machine *machine)
 543 {
 544         return machine__process_lost_event(machine, event, sample);
 545 }
 546
 547 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 548 {
 549         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 550                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 551                        event->mmap.len, event->mmap.pgoff,
 552                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 553                        event->mmap.filename);
 554 }
 555
 556 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 557 {
 558         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 559                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
 560                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 561                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 562                        event->mmap2.min, event->mmap2.ino,
 563                        event->mmap2.ino_generation,
 564                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 565                        event->mmap2.filename);
 566 }
 567
 568 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 569                              union perf_event *event,
 570                              struct perf_sample *sample,
 571                              struct machine *machine)
 572 {
 573         return machine__process_mmap_event(machine, event, sample);
 574 }
 575
 576 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 577                              union perf_event *event,
 578                              struct perf_sample *sample,
 579                              struct machine *machine)
 580 {
 581         return machine__process_mmap2_event(machine, event, sample);
 582 }
 583
 584 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 585 {
 586         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 587                        event->fork.pid, event->fork.tid,
 588                        event->fork.ppid, event->fork.ptid);
 589 }
 590
 591 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 592                              union perf_event *event,
 593                              struct perf_sample *sample,
 594                              struct machine *machine)
 595 {
 596         return machine__process_fork_event(machine, event, sample);
 597 }
 598
 599 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 600                              union perf_event *event,
 601                              struct perf_sample *sample,
 602                              struct machine *machine)
 603 {
 604         return machine__process_exit_event(machine, event, sample);
 605 }
 606
 607 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 608 {
 609         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 610                              perf_event__name(event->header.type));
 611
 612         switch (event->header.type) {
 613         case PERF_RECORD_COMM:
 614                 ret += perf_event__fprintf_comm(event, fp);
 615                 break;
 616         case PERF_RECORD_FORK:
 617         case PERF_RECORD_EXIT:
 618                 ret += perf_event__fprintf_task(event, fp);
 619                 break;
 620         case PERF_RECORD_MMAP:
 621                 ret += perf_event__fprintf_mmap(event, fp);
 622                 break;
 623         case PERF_RECORD_MMAP2:
 624                 ret += perf_event__fprintf_mmap2(event, fp);
 625                 break;
 626         default:
 627                 ret += fprintf(fp, "\n");
 628         }
 629
 630         return ret;
 631 }
 632
 633 int perf_event__process(struct perf_tool *tool __maybe_unused,
 634                         union perf_event *event,
 635                         struct perf_sample *sample,
 636                         struct machine *machine)
 637 {
 638         return machine__process_event(machine, event, sample);
 639 }
 640
 641 void thread__find_addr_map(struct thread *thread,
 642                            struct machine *machine, u8 cpumode,
 643                            enum map_type type, u64 addr,
 644                            struct addr_location *al)
 645 {
 646         struct map_groups *mg = &thread->mg;
 647         bool load_map = false;
 648
 649         al->machine = machine;
 650         al->thread = thread;
 651         al->addr = addr;
 652         al->cpumode = cpumode;
 653         al->filtered = false;
 654
 655         if (machine == NULL) {
 656                 al->map = NULL;
 657                 return;
 658         }
 659
 660         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 661                 al->level = 'k';
 662                 mg = &machine->kmaps;
 663                 load_map = true;
 664         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 665                 al->level = '.';
 666         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 667                 al->level = 'g';
 668                 mg = &machine->kmaps;
 669                 load_map = true;
 670         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
 671                 al->level = 'u';
 672         } else {
 673                 al->level = 'H';
 674                 al->map = NULL;
 675
 676                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 677                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 678                         !perf_guest)
 679                         al->filtered = true;
 680                 if ((cpumode == PERF_RECORD_MISC_USER ||
 681                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 682                         !perf_host)
 683                         al->filtered = true;
 684
 685                 return;
 686         }
 687 try_again:
 688         al->map = map_groups__find(mg, type, al->addr);
 689         if (al->map == NULL) {
 690                 /*
 691                  * If this is outside of all known maps, and is a negative
 692                  * address, try to look it up in the kernel dso, as it might be
 693                  * a vsyscall or vdso (which executes in user-mode).
 694                  *
 695                  * XXX This is nasty, we should have a symbol list in the
 696                  * "[vdso]" dso, but for now lets use the old trick of looking
 697                  * in the whole kernel symbol list.
 698                  */
 699                 if ((long long)al->addr < 0 &&
 700                     cpumode == PERF_RECORD_MISC_USER &&
 701                     machine && mg != &machine->kmaps) {
 702                         mg = &machine->kmaps;
 703                         goto try_again;
 704                 }
 705         } else {
 706                 /*
 707                  * Kernel maps might be changed when loading symbols so loading
 708                  * must be done prior to using kernel maps.
 709                  */
 710                 if (load_map)
 711                         map__load(al->map, machine->symbol_filter);
 712                 al->addr = al->map->map_ip(al->map, al->addr);
 713         }
 714 }
 715
 716 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 717                                 u8 cpumode, enum map_type type, u64 addr,
 718                                 struct addr_location *al)
 719 {
 720         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 721         if (al->map != NULL)
 722                 al->sym = map__find_symbol(al->map, al->addr,
 723                                            machine->symbol_filter);
 724         else
 725                 al->sym = NULL;
 726 }
 727
 728 int perf_event__preprocess_sample(const union perf_event *event,
 729                                   struct machine *machine,
 730                                   struct addr_location *al,
 731                                   struct perf_sample *sample)
 732 {
 733         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 734         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 735                                                         sample->pid);
 736
 737         if (thread == NULL)
 738                 return -1;
 739
 740         if (thread__is_filtered(thread))
 741                 goto out_filtered;
 742
 743         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 744         /*
 745          * Have we already created the kernel maps for this machine?
 746          *
 747          * This should have happened earlier, when we processed the kernel MMAP
 748          * events, but for older perf.data files there was no such thing, so do
 749          * it now.
 750          */
 751         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 752             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 753                 machine__create_kernel_maps(machine);
 754
 755         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 756                               sample->ip, al);
 757         dump_printf(" ...... dso: %s\n",
 758                     al->map ? al->map->dso->long_name :
 759                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 760         al->sym = NULL;
 761         al->cpu = sample->cpu;
 762
 763         if (al->map) {
 764                 struct dso *dso = al->map->dso;
 765
 766                 if (symbol_conf.dso_list &&
 767                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 768                                                   dso->short_name) ||
 769                                (dso->short_name != dso->long_name &&
 770                                 strlist__has_entry(symbol_conf.dso_list,
 771                                                    dso->long_name)))))
 772                         goto out_filtered;
 773
 774                 al->sym = map__find_symbol(al->map, al->addr,
 775                                            machine->symbol_filter);
 776         }
 777
 778         if (symbol_conf.sym_list &&
 779                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
 780                                                 al->sym->name)))
 781                 goto out_filtered;
 782
 783         return 0;
 784
 785 out_filtered:
 786         al->filtered = true;
 787         return 0;
 788 }