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         if (machine__is_host(machine))
 110                 tgid = perf_event__get_comm_tgid(pid, event->comm.comm,
 111                                                  sizeof(event->comm.comm));
 112         else
 113                 tgid = machine->pid;
 114
 115         if (tgid < 0)
 116                 goto out;
 117
 118         event->comm.pid = tgid;
 119         event->comm.header.type = PERF_RECORD_COMM;
 120
 121         size = strlen(event->comm.comm) + 1;
 122         size = PERF_ALIGN(size, sizeof(u64));
 123         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 124         event->comm.header.size = (sizeof(event->comm) -
 125                                 (sizeof(event->comm.comm) - size) +
 126                                 machine->id_hdr_size);
 127         if (!full) {
 128                 event->comm.tid = pid;
 129
 130                 if (process(tool, event, &synth_sample, machine) != 0)
 131                         return -1;
 132
 133                 goto out;
 134         }
 135
 136         if (machine__is_default_guest(machine))
 137                 return 0;
 138
 139         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 140                  machine->root_dir, pid);
 141
 142         tasks = opendir(filename);
 143         if (tasks == NULL) {
 144                 pr_debug("couldn't open %s\n", filename);
 145                 return 0;
 146         }
 147
 148         while (!readdir_r(tasks, &dirent, &next) && next) {
 149                 char *end;
 150                 pid = strtol(dirent.d_name, &end, 10);
 151                 if (*end)
 152                         continue;
 153
 154                 /* already have tgid; jut want to update the comm */
 155                 (void) perf_event__get_comm_tgid(pid, event->comm.comm,
 156                                          sizeof(event->comm.comm));
 157
 158                 size = strlen(event->comm.comm) + 1;
 159                 size = PERF_ALIGN(size, sizeof(u64));
 160                 memset(event->comm.comm + size, 0, machine->id_hdr_size);
 161                 event->comm.header.size = (sizeof(event->comm) -
 162                                           (sizeof(event->comm.comm) - size) +
 163                                           machine->id_hdr_size);
 164
 165                 event->comm.tid = pid;
 166
 167                 if (process(tool, event, &synth_sample, machine) != 0) {
 168                         tgid = -1;
 169                         break;
 170                 }
 171         }
 172
 173         closedir(tasks);
 174 out:
 175         return tgid;
 176 }
 177
 178 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 179                                        union perf_event *event,
 180                                        pid_t pid, pid_t tgid,
 181                                        perf_event__handler_t process,
 182                                        struct machine *machine,
 183                                        bool mmap_data)
 184 {
 185         char filename[PATH_MAX];
 186         FILE *fp;
 187         int rc = 0;
 188
 189         if (machine__is_default_guest(machine))
 190                 return 0;
 191
 192         snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
 193                  machine->root_dir, pid);
 194
 195         fp = fopen(filename, "r");
 196         if (fp == NULL) {
 197                 /*
 198                  * We raced with a task exiting - just return:
 199                  */
 200                 pr_debug("couldn't open %s\n", filename);
 201                 return -1;
 202         }
 203
 204         event->header.type = PERF_RECORD_MMAP;
 205
 206         while (1) {
 207                 char bf[BUFSIZ];
 208                 char prot[5];
 209                 char execname[PATH_MAX];
 210                 char anonstr[] = "//anon";
 211                 size_t size;
 212                 ssize_t n;
 213
 214                 if (fgets(bf, sizeof(bf), fp) == NULL)
 215                         break;
 216
 217                 /* ensure null termination since stack will be reused. */
 218                 strcpy(execname, "");
 219
 220                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 221                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %*x:%*x %*u %s\n",
 222                        &event->mmap.start, &event->mmap.len, prot,
 223                        &event->mmap.pgoff,
 224                        execname);
 225                 /*
 226                  * Anon maps don't have the execname.
 227                  */
 228                 if (n < 4)
 229                         continue;
 230                 /*
 231                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 232                  */
 233                 if (machine__is_host(machine))
 234                         event->header.misc = PERF_RECORD_MISC_USER;
 235                 else
 236                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 237
 238                 if (prot[2] != 'x') {
 239                         if (!mmap_data || prot[0] != 'r')
 240                                 continue;
 241
 242                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 243                 }
 244
 245                 if (!strcmp(execname, ""))
 246                         strcpy(execname, anonstr);
 247
 248                 size = strlen(execname) + 1;
 249                 memcpy(event->mmap.filename, execname, size);
 250                 size = PERF_ALIGN(size, sizeof(u64));
 251                 event->mmap.len -= event->mmap.start;
 252                 event->mmap.header.size = (sizeof(event->mmap) -
 253                                         (sizeof(event->mmap.filename) - size));
 254                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 255                 event->mmap.header.size += machine->id_hdr_size;
 256                 event->mmap.pid = tgid;
 257                 event->mmap.tid = pid;
 258
 259                 if (process(tool, event, &synth_sample, machine) != 0) {
 260                         rc = -1;
 261                         break;
 262                 }
 263         }
 264
 265         fclose(fp);
 266         return rc;
 267 }
 268
 269 int perf_event__synthesize_modules(struct perf_tool *tool,
 270                                    perf_event__handler_t process,
 271                                    struct machine *machine)
 272 {
 273         int rc = 0;
 274         struct rb_node *nd;
 275         struct map_groups *kmaps = &machine->kmaps;
 276         union perf_event *event = zalloc((sizeof(event->mmap) +
 277                                           machine->id_hdr_size));
 278         if (event == NULL) {
 279                 pr_debug("Not enough memory synthesizing mmap event "
 280                          "for kernel modules\n");
 281                 return -1;
 282         }
 283
 284         event->header.type = PERF_RECORD_MMAP;
 285
 286         /*
 287          * kernel uses 0 for user space maps, see kernel/perf_event.c
 288          * __perf_event_mmap
 289          */
 290         if (machine__is_host(machine))
 291                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 292         else
 293                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 294
 295         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 296              nd; nd = rb_next(nd)) {
 297                 size_t size;
 298                 struct map *pos = rb_entry(nd, struct map, rb_node);
 299
 300                 if (pos->dso->kernel)
 301                         continue;
 302
 303                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 304                 event->mmap.header.type = PERF_RECORD_MMAP;
 305                 event->mmap.header.size = (sizeof(event->mmap) -
 306                                         (sizeof(event->mmap.filename) - size));
 307                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 308                 event->mmap.header.size += machine->id_hdr_size;
 309                 event->mmap.start = pos->start;
 310                 event->mmap.len   = pos->end - pos->start;
 311                 event->mmap.pid   = machine->pid;
 312
 313                 memcpy(event->mmap.filename, pos->dso->long_name,
 314                        pos->dso->long_name_len + 1);
 315                 if (process(tool, event, &synth_sample, machine) != 0) {
 316                         rc = -1;
 317                         break;
 318                 }
 319         }
 320
 321         free(event);
 322         return rc;
 323 }
 324
 325 static int __event__synthesize_thread(union perf_event *comm_event,
 326                                       union perf_event *mmap_event,
 327                                       pid_t pid, int full,
 328                                           perf_event__handler_t process,
 329                                       struct perf_tool *tool,
 330                                       struct machine *machine, bool mmap_data)
 331 {
 332         pid_t tgid = perf_event__synthesize_comm(tool, comm_event, pid, full,
 333                                                  process, machine);
 334         if (tgid == -1)
 335                 return -1;
 336         return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 337                                                   process, machine, mmap_data);
 338 }
 339
 340 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 341                                       struct thread_map *threads,
 342                                       perf_event__handler_t process,
 343                                       struct machine *machine,
 344                                       bool mmap_data)
 345 {
 346         union perf_event *comm_event, *mmap_event;
 347         int err = -1, thread, j;
 348
 349         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 350         if (comm_event == NULL)
 351                 goto out;
 352
 353         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 354         if (mmap_event == NULL)
 355                 goto out_free_comm;
 356
 357         err = 0;
 358         for (thread = 0; thread < threads->nr; ++thread) {
 359                 if (__event__synthesize_thread(comm_event, mmap_event,
 360                                                threads->map[thread], 0,
 361                                                process, tool, machine,
 362                                                mmap_data)) {
 363                         err = -1;
 364                         break;
 365                 }
 366
 367                 /*
 368                  * comm.pid is set to thread group id by
 369                  * perf_event__synthesize_comm
 370                  */
 371                 if ((int) comm_event->comm.pid != threads->map[thread]) {
 372                         bool need_leader = true;
 373
 374                         /* is thread group leader in thread_map? */
 375                         for (j = 0; j < threads->nr; ++j) {
 376                                 if ((int) comm_event->comm.pid == threads->map[j]) {
 377                                         need_leader = false;
 378                                         break;
 379                                 }
 380                         }
 381
 382                         /* if not, generate events for it */
 383                         if (need_leader &&
 384                             __event__synthesize_thread(comm_event, mmap_event,
 385                                                        comm_event->comm.pid, 0,
 386                                                        process, tool, machine,
 387                                                        mmap_data)) {
 388                                 err = -1;
 389                                 break;
 390                         }
 391                 }
 392         }
 393         free(mmap_event);
 394 out_free_comm:
 395         free(comm_event);
 396 out:
 397         return err;
 398 }
 399
 400 int perf_event__synthesize_threads(struct perf_tool *tool,
 401                                    perf_event__handler_t process,
 402                                    struct machine *machine, bool mmap_data)
 403 {
 404         DIR *proc;
 405         char proc_path[PATH_MAX];
 406         struct dirent dirent, *next;
 407         union perf_event *comm_event, *mmap_event;
 408         int err = -1;
 409
 410         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 411         if (comm_event == NULL)
 412                 goto out;
 413
 414         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 415         if (mmap_event == NULL)
 416                 goto out_free_comm;
 417
 418         if (machine__is_default_guest(machine))
 419                 return 0;
 420
 421         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 422         proc = opendir(proc_path);
 423
 424         if (proc == NULL)
 425                 goto out_free_mmap;
 426
 427         while (!readdir_r(proc, &dirent, &next) && next) {
 428                 char *end;
 429                 pid_t pid = strtol(dirent.d_name, &end, 10);
 430
 431                 if (*end) /* only interested in proper numerical dirents */
 432                         continue;
 433                 /*
 434                  * We may race with exiting thread, so don't stop just because
 435                  * one thread couldn't be synthesized.
 436                  */
 437                 __event__synthesize_thread(comm_event, mmap_event, pid, 1,
 438                                            process, tool, machine, mmap_data);
 439         }
 440
 441         err = 0;
 442         closedir(proc);
 443 out_free_mmap:
 444         free(mmap_event);
 445 out_free_comm:
 446         free(comm_event);
 447 out:
 448         return err;
 449 }
 450
 451 struct process_symbol_args {
 452         const char *name;
 453         u64        start;
 454 };
 455
 456 static int find_symbol_cb(void *arg, const char *name, char type,
 457                           u64 start)
 458 {
 459         struct process_symbol_args *args = arg;
 460
 461         /*
 462          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 463          * an 'A' to the same address as "_stext".
 464          */
 465         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 466               type == 'A') || strcmp(name, args->name))
 467                 return 0;
 468
 469         args->start = start;
 470         return 1;
 471 }
 472
 473 u64 kallsyms__get_function_start(const char *kallsyms_filename,
 474                                  const char *symbol_name)
 475 {
 476         struct process_symbol_args args = { .name = symbol_name, };
 477
 478         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
 479                 return 0;
 480
 481         return args.start;
 482 }
 483
 484 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 485                                        perf_event__handler_t process,
 486                                        struct machine *machine)
 487 {
 488         size_t size;
 489         const char *mmap_name;
 490         char name_buff[PATH_MAX];
 491         struct map *map;
 492         struct kmap *kmap;
 493         int err;
 494         /*
 495          * We should get this from /sys/kernel/sections/.text, but till that is
 496          * available use this, and after it is use this as a fallback for older
 497          * kernels.
 498          */
 499         union perf_event *event = zalloc((sizeof(event->mmap) +
 500                                           machine->id_hdr_size));
 501         if (event == NULL) {
 502                 pr_debug("Not enough memory synthesizing mmap event "
 503                          "for kernel modules\n");
 504                 return -1;
 505         }
 506
 507         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 508         if (machine__is_host(machine)) {
 509                 /*
 510                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 511                  * see kernel/perf_event.c __perf_event_mmap
 512                  */
 513                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 514         } else {
 515                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 516         }
 517
 518         map = machine->vmlinux_maps[MAP__FUNCTION];
 519         kmap = map__kmap(map);
 520         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 521                         "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
 522         size = PERF_ALIGN(size, sizeof(u64));
 523         event->mmap.header.type = PERF_RECORD_MMAP;
 524         event->mmap.header.size = (sizeof(event->mmap) -
 525                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 526         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 527         event->mmap.start = map->start;
 528         event->mmap.len   = map->end - event->mmap.start;
 529         event->mmap.pid   = machine->pid;
 530
 531         err = process(tool, event, &synth_sample, machine);
 532         free(event);
 533
 534         return err;
 535 }
 536
 537 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 538 {
 539         return fprintf(fp, ": %s:%d\n", event->comm.comm, event->comm.tid);
 540 }
 541
 542 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 543                              union perf_event *event,
 544                              struct perf_sample *sample,
 545                              struct machine *machine)
 546 {
 547         return machine__process_comm_event(machine, event, sample);
 548 }
 549
 550 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 551                              union perf_event *event,
 552                              struct perf_sample *sample,
 553                              struct machine *machine)
 554 {
 555         return machine__process_lost_event(machine, event, sample);
 556 }
 557
 558 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 559 {
 560         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 561                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 562                        event->mmap.len, event->mmap.pgoff,
 563                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 564                        event->mmap.filename);
 565 }
 566
 567 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 568 {
 569         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 570                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c %s\n",
 571                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 572                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 573                        event->mmap2.min, event->mmap2.ino,
 574                        event->mmap2.ino_generation,
 575                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 576                        event->mmap2.filename);
 577 }
 578
 579 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 580                              union perf_event *event,
 581                              struct perf_sample *sample,
 582                              struct machine *machine)
 583 {
 584         return machine__process_mmap_event(machine, event, sample);
 585 }
 586
 587 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 588                              union perf_event *event,
 589                              struct perf_sample *sample,
 590                              struct machine *machine)
 591 {
 592         return machine__process_mmap2_event(machine, event, sample);
 593 }
 594
 595 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 596 {
 597         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 598                        event->fork.pid, event->fork.tid,
 599                        event->fork.ppid, event->fork.ptid);
 600 }
 601
 602 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 603                              union perf_event *event,
 604                              struct perf_sample *sample,
 605                              struct machine *machine)
 606 {
 607         return machine__process_fork_event(machine, event, sample);
 608 }
 609
 610 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 611                              union perf_event *event,
 612                              struct perf_sample *sample,
 613                              struct machine *machine)
 614 {
 615         return machine__process_exit_event(machine, event, sample);
 616 }
 617
 618 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 619 {
 620         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 621                              perf_event__name(event->header.type));
 622
 623         switch (event->header.type) {
 624         case PERF_RECORD_COMM:
 625                 ret += perf_event__fprintf_comm(event, fp);
 626                 break;
 627         case PERF_RECORD_FORK:
 628         case PERF_RECORD_EXIT:
 629                 ret += perf_event__fprintf_task(event, fp);
 630                 break;
 631         case PERF_RECORD_MMAP:
 632                 ret += perf_event__fprintf_mmap(event, fp);
 633                 break;
 634         case PERF_RECORD_MMAP2:
 635                 ret += perf_event__fprintf_mmap2(event, fp);
 636                 break;
 637         default:
 638                 ret += fprintf(fp, "\n");
 639         }
 640
 641         return ret;
 642 }
 643
 644 int perf_event__process(struct perf_tool *tool __maybe_unused,
 645                         union perf_event *event,
 646                         struct perf_sample *sample,
 647                         struct machine *machine)
 648 {
 649         return machine__process_event(machine, event, sample);
 650 }
 651
 652 void thread__find_addr_map(struct thread *thread,
 653                            struct machine *machine, u8 cpumode,
 654                            enum map_type type, u64 addr,
 655                            struct addr_location *al)
 656 {
 657         struct map_groups *mg = &thread->mg;
 658         bool load_map = false;
 659
 660         al->machine = machine;
 661         al->thread = thread;
 662         al->addr = addr;
 663         al->cpumode = cpumode;
 664         al->filtered = false;
 665
 666         if (machine == NULL) {
 667                 al->map = NULL;
 668                 return;
 669         }
 670
 671         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 672                 al->level = 'k';
 673                 mg = &machine->kmaps;
 674                 load_map = true;
 675         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 676                 al->level = '.';
 677         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 678                 al->level = 'g';
 679                 mg = &machine->kmaps;
 680                 load_map = true;
 681         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
 682                 al->level = 'u';
 683         } else {
 684                 al->level = 'H';
 685                 al->map = NULL;
 686
 687                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 688                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 689                         !perf_guest)
 690                         al->filtered = true;
 691                 if ((cpumode == PERF_RECORD_MISC_USER ||
 692                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 693                         !perf_host)
 694                         al->filtered = true;
 695
 696                 return;
 697         }
 698 try_again:
 699         al->map = map_groups__find(mg, type, al->addr);
 700         if (al->map == NULL) {
 701                 /*
 702                  * If this is outside of all known maps, and is a negative
 703                  * address, try to look it up in the kernel dso, as it might be
 704                  * a vsyscall or vdso (which executes in user-mode).
 705                  *
 706                  * XXX This is nasty, we should have a symbol list in the
 707                  * "[vdso]" dso, but for now lets use the old trick of looking
 708                  * in the whole kernel symbol list.
 709                  */
 710                 if ((long long)al->addr < 0 &&
 711                     cpumode == PERF_RECORD_MISC_USER &&
 712                     machine && mg != &machine->kmaps) {
 713                         mg = &machine->kmaps;
 714                         goto try_again;
 715                 }
 716         } else {
 717                 /*
 718                  * Kernel maps might be changed when loading symbols so loading
 719                  * must be done prior to using kernel maps.
 720                  */
 721                 if (load_map)
 722                         map__load(al->map, machine->symbol_filter);
 723                 al->addr = al->map->map_ip(al->map, al->addr);
 724         }
 725 }
 726
 727 void thread__find_addr_location(struct thread *thread, struct machine *machine,
 728                                 u8 cpumode, enum map_type type, u64 addr,
 729                                 struct addr_location *al)
 730 {
 731         thread__find_addr_map(thread, machine, cpumode, type, addr, al);
 732         if (al->map != NULL)
 733                 al->sym = map__find_symbol(al->map, al->addr,
 734                                            machine->symbol_filter);
 735         else
 736                 al->sym = NULL;
 737 }
 738
 739 int perf_event__preprocess_sample(const union perf_event *event,
 740                                   struct machine *machine,
 741                                   struct addr_location *al,
 742                                   struct perf_sample *sample)
 743 {
 744         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 745         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 746                                                         sample->pid);
 747
 748         if (thread == NULL)
 749                 return -1;
 750
 751         if (thread__is_filtered(thread))
 752                 goto out_filtered;
 753
 754         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 755         /*
 756          * Have we already created the kernel maps for this machine?
 757          *
 758          * This should have happened earlier, when we processed the kernel MMAP
 759          * events, but for older perf.data files there was no such thing, so do
 760          * it now.
 761          */
 762         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 763             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 764                 machine__create_kernel_maps(machine);
 765
 766         thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
 767                               sample->ip, al);
 768         dump_printf(" ...... dso: %s\n",
 769                     al->map ? al->map->dso->long_name :
 770                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 771         al->sym = NULL;
 772         al->cpu = sample->cpu;
 773
 774         if (al->map) {
 775                 struct dso *dso = al->map->dso;
 776
 777                 if (symbol_conf.dso_list &&
 778                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
 779                                                   dso->short_name) ||
 780                                (dso->short_name != dso->long_name &&
 781                                 strlist__has_entry(symbol_conf.dso_list,
 782                                                    dso->long_name)))))
 783                         goto out_filtered;
 784
 785                 al->sym = map__find_symbol(al->map, al->addr,
 786                                            machine->symbol_filter);
 787         }
 788
 789         if (symbol_conf.sym_list &&
 790                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
 791                                                 al->sym->name)))
 792                 goto out_filtered;
 793
 794         return 0;
 795
 796 out_filtered:
 797         al->filtered = true;
 798         return 0;
 799 }