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                 event->header.misc = PERF_RECORD_MISC_USER;
 224
 225                 if (prot[2] != 'x') {
 226                         if (!mmap_data || prot[0] != 'r')
 227                                 continue;
 228
 229                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 230                 }
 231
 232                 if (!strcmp(execname, ""))
 233                         strcpy(execname, anonstr);
 234
 235                 size = strlen(execname) + 1;
 236                 memcpy(event->mmap.filename, execname, size);
 237                 size = PERF_ALIGN(size, sizeof(u64));
 238                 event->mmap.len -= event->mmap.start;
 239                 event->mmap.header.size = (sizeof(event->mmap) -
 240                                         (sizeof(event->mmap.filename) - size));
 241                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 242                 event->mmap.header.size += machine->id_hdr_size;
 243                 event->mmap.pid = tgid;
 244                 event->mmap.tid = pid;
 245
 246                 if (process(tool, event, &synth_sample, machine) != 0) {
 247                         rc = -1;
 248                         break;
 249                 }
 250         }
 251
 252         fclose(fp);
 253         return rc;
 254 }
 255
 256 int perf_event__synthesize_modules(struct perf_tool *tool,
 257                                    perf_event__handler_t process,
 258                                    struct machine *machine)
 259 {
 260         int rc = 0;
 261         struct rb_node *nd;
 262         struct map_groups *kmaps = &machine->kmaps;
 263         union perf_event *event = zalloc((sizeof(event->mmap) +
 264                                           machine->id_hdr_size));
 265         if (event == NULL) {
 266                 pr_debug("Not enough memory synthesizing mmap event "
 267                          "for kernel modules\n");
 268                 return -1;
 269         }
 270
 271         event->header.type = PERF_RECORD_MMAP;
 272
 273         /*
 274          * kernel uses 0 for user space maps, see kernel/perf_event.c
 275          * __perf_event_mmap
 276          */
 277         if (machine__is_host(machine))
 278                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 279         else
 280                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 281
 282         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 283              nd; nd = rb_next(nd)) {
 284                 size_t size;
 285                 struct map *pos = rb_entry(nd, struct map, rb_node);
 286
 287                 if (pos->dso->kernel)
 288                         continue;
 289
 290                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 291                 event->mmap.header.type = PERF_RECORD_MMAP;
 292                 event->mmap.header.size = (sizeof(event->mmap) -
 293                                         (sizeof(event->mmap.filename) - size));
 294                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 295                 event->mmap.header.size += machine->id_hdr_size;
 296                 event->mmap.start = pos->start;
 297                 event->mmap.len   = pos->end - pos->start;
 298                 event->mmap.pid   = machine->pid;
 299
 300                 memcpy(event->mmap.filename, pos->dso->long_name,
 301                        pos->dso->long_name_len + 1);
 302                 if (process(tool, event, &synth_sample, machine) != 0) {
 303                         rc = -1;
 304                         break;
 305                 }
 306         }
 307
 308         free(event);
 309         return rc;
 310 }
 311
 312 static int __event__synthesize_thread(union perf_event *comm_event,
 313                                       union perf_event *mmap_event,
 314                                       pid_t pid, int full,
 315                                           perf_event__handler_t process,
 316                                       struct perf_tool *tool,
 317                                       struct machine *machine, bool mmap_data)
 318 {
 319         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 320                                                  process, machine);
 321         if (tgid == -1)
 322                 return -1;
 323         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 324                                                   process, machine, mmap_data);
 325 }
 326
 327 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 328                                       struct thread_map *threads,
 329                                       perf_event__handler_t process,
 330                                       struct machine *machine,
 331                                       bool mmap_data)
 332 {
 333         union perf_event *comm_event, *mmap_event;
 334         int err = -1, thread, j;
 335
 336         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 337         if (comm_event == NULL)
 338                 goto out;
 339
 340         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 341         if (mmap_event == NULL)
 342                 goto out_free_comm;
 343
 344         err = 0;
 345         for (thread = 0; thread < threads->nr; ++thread) {
 346                 if (__event__synthesize_thread(comm_event, mmap_event,
 347                                                threads->map[thread], 0,
 348                                                process, tool, machine,
 349                                                mmap_data)) {
 350                         err = -1;
 351                         break;
 352                 }
 353
 354                 /*
 355                  * comm.pid is set to thread group id by
 356                  * perf_event__synthesize_comm
 357                  */
 358                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 359                         bool need_leader = true;
 360
 361                         /* is thread group leader in thread_map? */
 362                         for (j = 0; j < threads->nr; ++j) {
 363                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 364                                         need_leader = false;
 365                                         break;
 366                                 }
 367                         }
 368
 369                         /* if not, generate events for it */
 370                         if (need_leader &&
 371                             __event__synthesize_thread(comm_event, mmap_event,
 372                                                        comm_event->comm.pid, 0,
 373                                                        process, tool, machine,
 374                                                        mmap_data)) {
 375                                 err = -1;
 376                                 break;
 377                         }
 378                 }
 379         }
 380         free(mmap_event);
 381 out_free_comm:
 382         free(comm_event);
 383 out:
 384         return err;
 385 }
 386
 387 int perf_event__synthesize_threads(struct perf_tool *tool,
 388                                    perf_event__handler_t process,
 389                                    struct machine *machine, bool mmap_data)
 390 {
 391         DIR *proc;
 392         char proc_path[PATH_MAX];
 393         struct dirent dirent, *next;
 394         union perf_event *comm_event, *mmap_event;
 395         int err = -1;
 396
 397         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 398         if (comm_event == NULL)
 399                 goto out;
 400
 401         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 402         if (mmap_event == NULL)
 403                 goto out_free_comm;
 404
 405         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 406         proc = opendir(proc_path);
 407
 408         if (proc == NULL)
 409                 goto out_free_mmap;
 410
 411         while (!readdir_r(proc, &dirent, &next) && next) {
 412                 char *end;
 413                 pid_t pid = strtol(dirent.d_name, &end, 10);
 414
 415                 if (*end) /* only interested in proper numerical dirents */
 416                         continue;
 417                 /*
 418                  * We may race with exiting thread, so don't stop just because
 419                  * one thread couldn't be synthesized.
 420                  */
 421                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 422                                            process, tool, machine, mmap_data);
 423         }
 424
 425         err = 0;
 426         closedir(proc);
 427 out_free_mmap:
 428         free(mmap_event);
 429 out_free_comm:
 430         free(comm_event);
 431 out:
 432         return err;
 433 }
 434
 435 struct process_symbol_args {
 436         const char *name;
 437         u64        start;
 438 };
 439
 440 static int find_symbol_cb(void *arg, const char *name, char type,
 441                           u64 start)
 442 {
 443         struct process_symbol_args *args = arg;
 444
 445         /*
 446          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 447          * an 'A' to the same address as "_stext".
 448          */
 449         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 450               type == 'A') || strcmp(name, args->name))
 451                 return 0;
 452
 453         args->start = start;
 454         return 1;
 455 }
 456
 457 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 458                                        perf_event__handler_t process,
 459                                        struct machine *machine,
 460                                        const char *symbol_name)
 461 {
 462         size_t size;
 463         const char *filename, *mmap_name;
 464         char path[PATH_MAX];
 465         char name_buff[PATH_MAX];
 466         struct map *map;
 467         int err;
 468         /*
 469          * We should get this from /sys/kernel/sections/.text, but till that is
 470          * available use this, and after it is use this as a fallback for older
 471          * kernels.
 472          */
 473         struct process_symbol_args args = { .name = symbol_name, };
 474         union perf_event *event = zalloc((sizeof(event->mmap) +
 475                                           machine->id_hdr_size));
 476         if (event == NULL) {
 477                 pr_debug("Not enough memory synthesizing mmap event "
 478                          "for kernel modules\n");
 479                 return -1;
 480         }
 481
 482         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 483         if (machine__is_host(machine)) {
 484                 /*
 485                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 486                  * see kernel/perf_event.c __perf_event_mmap
 487                  */
 488                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 489                 filename = "/proc/kallsyms";
 490         } else {
 491                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 492                 if (machine__is_default_guest(machine))
 493                         filename = (char *) symbol_conf.default_guest_kallsyms;
 494                 else {
 495                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 496                         filename = path;
 497                 }
 498         }
 499
 500         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0) {
 501                 free(event);
 502                 return -ENOENT;
 503         }
 504
 505         map = machine->vmlinux_maps[MAP__FUNCTION];
 506         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 507                         "%s%s", mmap_name, symbol_name) + 1;
 508         size = PERF_ALIGN(size, sizeof(u64));
 509         event->mmap.header.type = PERF_RECORD_MMAP;
 510         event->mmap.header.size = (sizeof(event->mmap) -
 511                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 512         event->mmap.pgoff = args.start;
 513         event->mmap.start = map->start;
 514         event->mmap.len   = map->end - event->mmap.start;
 515         event->mmap.pid   = machine->pid;
 516
 517         err = process(tool, event, &synth_sample, machine);
 518         free(event);
 519
 520         return err;
 521 }
 522
 523 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 524 {
 525         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 526 }
 527
 528 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 529                              union perf_event *event,
 530                              struct perf_sample *sample,
 531                              struct machine *machine)
 532 {
 533         return machine__process_comm_event(machine, event, sample);
 534 }
 535
 536 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 537                              union perf_event *event,
 538                              struct perf_sample *sample,
 539                              struct machine *machine)
 540 {
 541         return machine__process_lost_event(machine, event, sample);
 542 }
 543
 544 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 545 {
 546         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 547                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 548                        event->mmap.len, event->mmap.pgoff,
 549                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 550                        event->mmap.filename);
 551 }
 552
 553 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 554 {
 555         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 556                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
 557                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 558                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 559                        event->mmap2.min, event->mmap2.ino,
 560                        event->mmap2.ino_generation,
 561                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 562                        event->mmap2.filename);
 563 }
 564
 565 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 566                              union perf_event *event,
 567                              struct perf_sample *sample,
 568                              struct machine *machine)
 569 {
 570         return machine__process_mmap_event(machine, event, sample);
 571 }
 572
 573 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 574                              union perf_event *event,
 575                              struct perf_sample *sample,
 576                              struct machine *machine)
 577 {
 578         return machine__process_mmap2_event(machine, event, sample);
 579 }
 580
 581 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 582 {
 583         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 584                        event->fork.pid, event->fork.tid,
 585                        event->fork.ppid, event->fork.ptid);
 586 }
 587
 588 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 589                              union perf_event *event,
 590                              struct perf_sample *sample,
 591                              struct machine *machine)
 592 {
 593         return machine__process_fork_event(machine, event, sample);
 594 }
 595
 596 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 597                              union perf_event *event,
 598                              struct perf_sample *sample,
 599                              struct machine *machine)
 600 {
 601         return machine__process_exit_event(machine, event, sample);
 602 }
 603
 604 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 605 {
 606         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 607                              perf_event__name(event->header.type));
 608
 609         switch (event->header.type) {
 610         case PERF_RECORD_COMM:
 611                 ret += perf_event__fprintf_comm(event, fp);
 612                 break;
 613         case PERF_RECORD_FORK:
 614         case PERF_RECORD_EXIT:
 615                 ret += perf_event__fprintf_task(event, fp);
 616                 break;
 617         case PERF_RECORD_MMAP:
 618                 ret += perf_event__fprintf_mmap(event, fp);
 619                 break;
 620         case PERF_RECORD_MMAP2:
 621                 ret += perf_event__fprintf_mmap2(event, fp);
 622                 break;
 623         default:
 624                 ret += fprintf(fp, "\n");
 625         }
 626
 627         return ret;
 628 }
 629
 630 int perf_event__process(struct perf_tool *tool __maybe_unused,
 631                         union perf_event *event,
 632                         struct perf_sample *sample,
 633                         struct machine *machine)
 634 {
 635         return machine__process_event(machine, event, sample);
 636 }
 637
 638 void thread__find_addr_map(struct thread *thread,
 639                            struct machine *machine, u8 cpumode,
 640                            enum map_type type, u64 addr,
 641                            struct addr_location *al)
 642 {
 643         struct map_groups *mg = &thread->mg;
 644         bool load_map = false;
 645
 646         al->machine = machine;
 647         al->thread = thread;
 648         al->addr = addr;
 649         al->cpumode = cpumode;
 650         al->filtered = false;
 651
 652         if (machine == NULL) {
 653                 al->map = NULL;
 654                 return;
 655         }
 656
 657         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 658                 al->level = 'k';
 659                 mg = &machine->kmaps;
 660                 load_map = true;
 661         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 662                 al->level = '.';
 663         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 664                 al->level = 'g';
 665                 mg = &machine->kmaps;
 666                 load_map = true;
 667         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
 668                 al->level = 'u';
 669         } else {
 670                 al->level = 'H';
 671                 al->map = NULL;
 672
 673                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 674                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 675                         !perf_guest)
 676                         al->filtered = true;
 677                 if ((cpumode == PERF_RECORD_MISC_USER ||
 678                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 679                         !perf_host)
 680                         al->filtered = true;
 681
 682                 return;
 683         }
 684 try_again:
 685         al->map = map_groups__find(mg, type, al->addr);
 686         if (al->map == NULL) {
 687                 /*
 688                  * If this is outside of all known maps, and is a negative
 689                  * address, try to look it up in the kernel dso, as it might be
 690                  * a vsyscall or vdso (which executes in user-mode).
 691                  *
 692                  * XXX This is nasty, we should have a symbol list in the
 693                  * "[vdso]" dso, but for now lets use the old trick of looking
 694                  * in the whole kernel symbol list.
 695                  */
 696                 if ((long long)al->addr < 0 &&
 697                     cpumode == PERF_RECORD_MISC_USER &&
 698                     machine && mg != &machine->kmaps) {
 699                         mg = &machine->kmaps;
 700                         goto try_again;
 701                 }
 702         } else {
 703                 /*
 704                  * Kernel maps might be changed when loading symbols so loading
 705                  * must be done prior to using kernel maps.
 706                  */
 707                 if (load_map)
 708                         map__load(al->map, machine->symbol_filter);
 709                 al->addr = al->map->map_ip(al->map, al->addr);
 710         }
 711 }
 712
 713 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 714                                 u8 cpumode, enum map_type type, u64 addr,
 715                                 struct addr_location *al)
 716 {
 717         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 718         if (al->map != NULL)
 719                 al->sym = map__find_symbol(al->map, al->addr,
 720                                            machine->symbol_filter);
 721         else
 722                 al->sym = NULL;
 723 }
 724
 725 int perf_event__preprocess_sample(const union perf_event *event,
 726                                   struct machine *machine,
 727                                   struct addr_location *al,
 728                                   struct perf_sample *sample)
 729 {
 730         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 731         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 732                                                         sample->pid);
 733
 734         if (thread == NULL)
 735                 return -1;
 736
 737         if (thread__is_filtered(thread))
 738                 goto out_filtered;
 739
 740         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 741         /*
 742          * Have we already created the kernel maps for this machine?
 743          *
 744          * This should have happened earlier, when we processed the kernel MMAP
 745          * events, but for older perf.data files there was no such thing, so do
 746          * it now.
 747          */
 748         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 749             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 750                 machine__create_kernel_maps(machine);
 751
 752         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 753                               sample->ip, al);
 754         dump_printf(" ...... dso: %s\n",
 755                     al->map ? al->map->dso->long_name :
 756                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 757         al->sym = NULL;
 758         al->cpu = sample->cpu;
 759
 760         if (al->map) {
 761                 struct dso *dso = al->map->dso;
 762
 763                 if (symbol_conf.dso_list &&
 764                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 765                                                   dso->short_name) ||
 766                                (dso->short_name != dso->long_name &&
 767                                 strlist__has_entry(symbol_conf.dso_list,
 768                                                    dso->long_name)))))
 769                         goto out_filtered;
 770
 771                 al->sym = map__find_symbol(al->map, al->addr,
 772                                            machine->symbol_filter);
 773         }
 774
 775         if (symbol_conf.sym_list &&
 776                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
 777                                                 al->sym->name)))
 778                 goto out_filtered;
 779
 780         return 0;
 781
 782 out_filtered:
 783         al->filtered = true;
 784         return 0;
 785 }