tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include "event.h"
   3 #include "debug.h"
   4 #include "session.h"
   5 #include "sort.h"
   6 #include "string.h"
   7 #include "strlist.h"
   8 #include "thread.h"
   9
  10 static const char *event__name[] = {
  11         [0]                      = "TOTAL",
  12         [PERF_RECORD_MMAP]       = "MMAP",
  13         [PERF_RECORD_LOST]       = "LOST",
  14         [PERF_RECORD_COMM]       = "COMM",
  15         [PERF_RECORD_EXIT]       = "EXIT",
  16         [PERF_RECORD_THROTTLE]   = "THROTTLE",
  17         [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
  18         [PERF_RECORD_FORK]       = "FORK",
  19         [PERF_RECORD_READ]       = "READ",
  20         [PERF_RECORD_SAMPLE]     = "SAMPLE",
  21         [PERF_RECORD_HEADER_ATTR]        = "ATTR",
  22         [PERF_RECORD_HEADER_EVENT_TYPE]  = "EVENT_TYPE",
  23         [PERF_RECORD_HEADER_TRACING_DATA]        = "TRACING_DATA",
  24         [PERF_RECORD_HEADER_BUILD_ID]    = "BUILD_ID",
  25         [PERF_RECORD_FINISHED_ROUND]     = "FINISHED_ROUND",
  26 };
  27
  28 const char *event__get_event_name(unsigned int id)
  29 {
  30         if (id >= ARRAY_SIZE(event__name))
  31                 return "INVALID";
  32         if (!event__name[id])
  33                 return "UNKNOWN";
  34         return event__name[id];
  35 }
  36
  37 static struct sample_data synth_sample = {
  38         .pid       = -1,
  39         .tid       = -1,
  40         .time      = -1,
  41         .stream_id = -1,
  42         .cpu       = -1,
  43         .period    = 1,
  44 };
  45
  46 static pid_t event__synthesize_comm(event_t *event, pid_t pid, int full,
  47                                     event__handler_t process,
  48                                     struct perf_session *session)
  49 {
  50         char filename[PATH_MAX];
  51         char bf[BUFSIZ];
  52         FILE *fp;
  53         size_t size = 0;
  54         DIR *tasks;
  55         struct dirent dirent, *next;
  56         pid_t tgid = 0;
  57
  58         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  59
  60         fp = fopen(filename, "r");
  61         if (fp == NULL) {
  62 out_race:
  63                 /*
  64                  * We raced with a task exiting - just return:
  65                  */
  66                 pr_debug("couldn't open %s\n", filename);
  67                 return 0;
  68         }
  69
  70         memset(&event->comm, 0, sizeof(event->comm));
  71
  72         while (!event->comm.comm[0] || !event->comm.pid) {
  73                 if (fgets(bf, sizeof(bf), fp) == NULL) {
  74                         pr_warning("couldn't get COMM and pgid, malformed %s\n", filename);
  75                         goto out;
  76                 }
  77
  78                 if (memcmp(bf, "Name:", 5) == 0) {
  79                         char *name = bf + 5;
  80                         while (*name && isspace(*name))
  81                                 ++name;
  82                         size = strlen(name) - 1;
  83                         memcpy(event->comm.comm, name, size++);
  84                 } else if (memcmp(bf, "Tgid:", 5) == 0) {
  85                         char *tgids = bf + 5;
  86                         while (*tgids && isspace(*tgids))
  87                                 ++tgids;
  88                         tgid = event->comm.pid = atoi(tgids);
  89                 }
  90         }
  91
  92         event->comm.header.type = PERF_RECORD_COMM;
  93         size = ALIGN(size, sizeof(u64));
  94         memset(event->comm.comm + size, 0, session->id_hdr_size);
  95         event->comm.header.size = (sizeof(event->comm) -
  96                                 (sizeof(event->comm.comm) - size) +
  97                                 session->id_hdr_size);
  98         if (!full) {
  99                 event->comm.tid = pid;
 100
 101                 process(event, &synth_sample, session);
 102                 goto out;
 103         }
 104
 105         snprintf(filename, sizeof(filename), "/proc/%d/task", pid);
 106
 107         tasks = opendir(filename);
 108         if (tasks == NULL)
 109                 goto out_race;
 110
 111         while (!readdir_r(tasks, &dirent, &next) && next) {
 112                 char *end;
 113                 pid = strtol(dirent.d_name, &end, 10);
 114                 if (*end)
 115                         continue;
 116
 117                 event->comm.tid = pid;
 118
 119                 process(event, &synth_sample, session);
 120         }
 121
 122         closedir(tasks);
 123 out:
 124         fclose(fp);
 125
 126         return tgid;
 127 }
 128
 129 static int event__synthesize_mmap_events(event_t *event, pid_t pid, pid_t tgid,
 130                                          event__handler_t process,
 131                                          struct perf_session *session)
 132 {
 133         char filename[PATH_MAX];
 134         FILE *fp;
 135
 136         snprintf(filename, sizeof(filename), "/proc/%d/maps", pid);
 137
 138         fp = fopen(filename, "r");
 139         if (fp == NULL) {
 140                 /*
 141                  * We raced with a task exiting - just return:
 142                  */
 143                 pr_debug("couldn't open %s\n", filename);
 144                 return -1;
 145         }
 146
 147         event->header.type = PERF_RECORD_MMAP;
 148         /*
 149          * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 150          */
 151         event->header.misc = PERF_RECORD_MISC_USER;
 152
 153         while (1) {
 154                 char bf[BUFSIZ], *pbf = bf;
 155                 int n;
 156                 size_t size;
 157                 if (fgets(bf, sizeof(bf), fp) == NULL)
 158                         break;
 159
 160                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 161                 n = hex2u64(pbf, &event->mmap.start);
 162                 if (n < 0)
 163                         continue;
 164                 pbf += n + 1;
 165                 n = hex2u64(pbf, &event->mmap.len);
 166                 if (n < 0)
 167                         continue;
 168                 pbf += n + 3;
 169                 if (*pbf == 'x') { /* vm_exec */
 170                         char *execname = strchr(bf, '/');
 171
 172                         /* Catch VDSO */
 173                         if (execname == NULL)
 174                                 execname = strstr(bf, "[vdso]");
 175
 176                         if (execname == NULL)
 177                                 continue;
 178
 179                         pbf += 3;
 180                         n = hex2u64(pbf, &event->mmap.pgoff);
 181
 182                         size = strlen(execname);
 183                         execname[size - 1] = '\0'; /* Remove \n */
 184                         memcpy(event->mmap.filename, execname, size);
 185                         size = ALIGN(size, sizeof(u64));
 186                         event->mmap.len -= event->mmap.start;
 187                         event->mmap.header.size = (sizeof(event->mmap) -
 188                                                 (sizeof(event->mmap.filename) - size));
 189                         memset(event->mmap.filename + size, 0, session->id_hdr_size);
 190                         event->mmap.header.size += session->id_hdr_size;
 191                         event->mmap.pid = tgid;
 192                         event->mmap.tid = pid;
 193
 194                         process(event, &synth_sample, session);
 195                 }
 196         }
 197
 198         fclose(fp);
 199         return 0;
 200 }
 201
 202 int event__synthesize_modules(event__handler_t process,
 203                               struct perf_session *session,
 204                               struct machine *machine)
 205 {
 206         struct rb_node *nd;
 207         struct map_groups *kmaps = &machine->kmaps;
 208         event_t *event = zalloc(sizeof(event->mmap) + session->id_hdr_size);
 209
 210         if (event == NULL) {
 211                 pr_debug("Not enough memory synthesizing mmap event "
 212                          "for kernel modules\n");
 213                 return -1;
 214         }
 215
 216         event->header.type = PERF_RECORD_MMAP;
 217
 218         /*
 219          * kernel uses 0 for user space maps, see kernel/perf_event.c
 220          * __perf_event_mmap
 221          */
 222         if (machine__is_host(machine))
 223                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 224         else
 225                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 226
 227         for (nd = rb_first(&kmaps->maps[MAP__FUNCTION]);
 228              nd; nd = rb_next(nd)) {
 229                 size_t size;
 230                 struct map *pos = rb_entry(nd, struct map, rb_node);
 231
 232                 if (pos->dso->kernel)
 233                         continue;
 234
 235                 size = ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 236                 event->mmap.header.type = PERF_RECORD_MMAP;
 237                 event->mmap.header.size = (sizeof(event->mmap) -
 238                                         (sizeof(event->mmap.filename) - size));
 239                 memset(event->mmap.filename + size, 0, session->id_hdr_size);
 240                 event->mmap.header.size += session->id_hdr_size;
 241                 event->mmap.start = pos->start;
 242                 event->mmap.len   = pos->end - pos->start;
 243                 event->mmap.pid   = machine->pid;
 244
 245                 memcpy(event->mmap.filename, pos->dso->long_name,
 246                        pos->dso->long_name_len + 1);
 247                 process(event, &synth_sample, session);
 248         }
 249
 250         free(event);
 251         return 0;
 252 }
 253
 254 static int __event__synthesize_thread(event_t *comm_event, event_t *mmap_event,
 255                                       pid_t pid, event__handler_t process,
 256                                       struct perf_session *session)
 257 {
 258         pid_t tgid = event__synthesize_comm(comm_event, pid, 1, process,
 259                                             session);
 260         if (tgid == -1)
 261                 return -1;
 262         return event__synthesize_mmap_events(mmap_event, pid, tgid,
 263                                              process, session);
 264 }
 265
 266 int event__synthesize_thread(pid_t pid, event__handler_t process,
 267                              struct perf_session *session)
 268 {
 269         event_t *comm_event, *mmap_event;
 270         int err = -1;
 271
 272         comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
 273         if (comm_event == NULL)
 274                 goto out;
 275
 276         mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
 277         if (mmap_event == NULL)
 278                 goto out_free_comm;
 279
 280         err = __event__synthesize_thread(comm_event, mmap_event, pid,
 281                                          process, session);
 282         free(mmap_event);
 283 out_free_comm:
 284         free(comm_event);
 285 out:
 286         return err;
 287 }
 288
 289 int event__synthesize_threads(event__handler_t process,
 290                               struct perf_session *session)
 291 {
 292         DIR *proc;
 293         struct dirent dirent, *next;
 294         event_t *comm_event, *mmap_event;
 295         int err = -1;
 296
 297         comm_event = malloc(sizeof(comm_event->comm) + session->id_hdr_size);
 298         if (comm_event == NULL)
 299                 goto out;
 300
 301         mmap_event = malloc(sizeof(mmap_event->mmap) + session->id_hdr_size);
 302         if (mmap_event == NULL)
 303                 goto out_free_comm;
 304
 305         proc = opendir("/proc");
 306         if (proc == NULL)
 307                 goto out_free_mmap;
 308
 309         while (!readdir_r(proc, &dirent, &next) && next) {
 310                 char *end;
 311                 pid_t pid = strtol(dirent.d_name, &end, 10);
 312
 313                 if (*end) /* only interested in proper numerical dirents */
 314                         continue;
 315
 316                 __event__synthesize_thread(comm_event, mmap_event, pid,
 317                                            process, session);
 318         }
 319
 320         closedir(proc);
 321         err = 0;
 322 out_free_mmap:
 323         free(mmap_event);
 324 out_free_comm:
 325         free(comm_event);
 326 out:
 327         return err;
 328 }
 329
 330 struct process_symbol_args {
 331         const char *name;
 332         u64        start;
 333 };
 334
 335 static int find_symbol_cb(void *arg, const char *name, char type,
 336                           u64 start, u64 end __used)
 337 {
 338         struct process_symbol_args *args = arg;
 339
 340         /*
 341          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 342          * an 'A' to the same address as "_stext".
 343          */
 344         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 345               type == 'A') || strcmp(name, args->name))
 346                 return 0;
 347
 348         args->start = start;
 349         return 1;
 350 }
 351
 352 int event__synthesize_kernel_mmap(event__handler_t process,
 353                                   struct perf_session *session,
 354                                   struct machine *machine,
 355                                   const char *symbol_name)
 356 {
 357         size_t size;
 358         const char *filename, *mmap_name;
 359         char path[PATH_MAX];
 360         char name_buff[PATH_MAX];
 361         struct map *map;
 362         int err;
 363         /*
 364          * We should get this from /sys/kernel/sections/.text, but till that is
 365          * available use this, and after it is use this as a fallback for older
 366          * kernels.
 367          */
 368         struct process_symbol_args args = { .name = symbol_name, };
 369         event_t *event = zalloc(sizeof(event->mmap) + session->id_hdr_size);
 370
 371         if (event == NULL) {
 372                 pr_debug("Not enough memory synthesizing mmap event "
 373                          "for kernel modules\n");
 374                 return -1;
 375         }
 376
 377         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 378         if (machine__is_host(machine)) {
 379                 /*
 380                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 381                  * see kernel/perf_event.c __perf_event_mmap
 382                  */
 383                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 384                 filename = "/proc/kallsyms";
 385         } else {
 386                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 387                 if (machine__is_default_guest(machine))
 388                         filename = (char *) symbol_conf.default_guest_kallsyms;
 389                 else {
 390                         sprintf(path, "%s/proc/kallsyms", machine->root_dir);
 391                         filename = path;
 392                 }
 393         }
 394
 395         if (kallsyms__parse(filename, &args, find_symbol_cb) <= 0)
 396                 return -ENOENT;
 397
 398         map = machine->vmlinux_maps[MAP__FUNCTION];
 399         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 400                         "%s%s", mmap_name, symbol_name) + 1;
 401         size = ALIGN(size, sizeof(u64));
 402         event->mmap.header.type = PERF_RECORD_MMAP;
 403         event->mmap.header.size = (sizeof(event->mmap) -
 404                         (sizeof(event->mmap.filename) - size) + session->id_hdr_size);
 405         event->mmap.pgoff = args.start;
 406         event->mmap.start = map->start;
 407         event->mmap.len   = map->end - event->mmap.start;
 408         event->mmap.pid   = machine->pid;
 409
 410         err = process(event, &synth_sample, session);
 411         free(event);
 412
 413         return err;
 414 }
 415
 416 static void thread__comm_adjust(struct thread *self, struct hists *hists)
 417 {
 418         char *comm = self->comm;
 419
 420         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 421             (!symbol_conf.comm_list ||
 422              strlist__has_entry(symbol_conf.comm_list, comm))) {
 423                 u16 slen = strlen(comm);
 424
 425                 if (hists__new_col_len(hists, HISTC_COMM, slen))
 426                         hists__set_col_len(hists, HISTC_THREAD, slen + 6);
 427         }
 428 }
 429
 430 static int thread__set_comm_adjust(struct thread *self, const char *comm,
 431                                    struct hists *hists)
 432 {
 433         int ret = thread__set_comm(self, comm);
 434
 435         if (ret)
 436                 return ret;
 437
 438         thread__comm_adjust(self, hists);
 439
 440         return 0;
 441 }
 442
 443 int event__process_comm(event_t *self, struct sample_data *sample __used,
 444                         struct perf_session *session)
 445 {
 446         struct thread *thread = perf_session__findnew(session, self->comm.tid);
 447
 448         dump_printf(": %s:%d\n", self->comm.comm, self->comm.tid);
 449
 450         if (thread == NULL || thread__set_comm_adjust(thread, self->comm.comm,
 451                                                       &session->hists)) {
 452                 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
 453                 return -1;
 454         }
 455
 456         return 0;
 457 }
 458
 459 int event__process_lost(event_t *self, struct sample_data *sample __used,
 460                         struct perf_session *session)
 461 {
 462         dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
 463                     self->lost.id, self->lost.lost);
 464         session->hists.stats.total_lost += self->lost.lost;
 465         return 0;
 466 }
 467
 468 static void event_set_kernel_mmap_len(struct map **maps, event_t *self)
 469 {
 470         maps[MAP__FUNCTION]->start = self->mmap.start;
 471         maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 472         /*
 473          * Be a bit paranoid here, some perf.data file came with
 474          * a zero sized synthesized MMAP event for the kernel.
 475          */
 476         if (maps[MAP__FUNCTION]->end == 0)
 477                 maps[MAP__FUNCTION]->end = ~0ULL;
 478 }
 479
 480 static int event__process_kernel_mmap(event_t *self,
 481                         struct perf_session *session)
 482 {
 483         struct map *map;
 484         char kmmap_prefix[PATH_MAX];
 485         struct machine *machine;
 486         enum dso_kernel_type kernel_type;
 487         bool is_kernel_mmap;
 488
 489         machine = perf_session__findnew_machine(session, self->mmap.pid);
 490         if (!machine) {
 491                 pr_err("Can't find id %d's machine\n", self->mmap.pid);
 492                 goto out_problem;
 493         }
 494
 495         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 496         if (machine__is_host(machine))
 497                 kernel_type = DSO_TYPE_KERNEL;
 498         else
 499                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 500
 501         is_kernel_mmap = memcmp(self->mmap.filename,
 502                                 kmmap_prefix,
 503                                 strlen(kmmap_prefix)) == 0;
 504         if (self->mmap.filename[0] == '/' ||
 505             (!is_kernel_mmap && self->mmap.filename[0] == '[')) {
 506
 507                 char short_module_name[1024];
 508                 char *name, *dot;
 509
 510                 if (self->mmap.filename[0] == '/') {
 511                         name = strrchr(self->mmap.filename, '/');
 512                         if (name == NULL)
 513                                 goto out_problem;
 514
 515                         ++name; /* skip / */
 516                         dot = strrchr(name, '.');
 517                         if (dot == NULL)
 518                                 goto out_problem;
 519                         snprintf(short_module_name, sizeof(short_module_name),
 520                                         "[%.*s]", (int)(dot - name), name);
 521                         strxfrchar(short_module_name, '-', '_');
 522                 } else
 523                         strcpy(short_module_name, self->mmap.filename);
 524
 525                 map = machine__new_module(machine, self->mmap.start,
 526                                           self->mmap.filename);
 527                 if (map == NULL)
 528                         goto out_problem;
 529
 530                 name = strdup(short_module_name);
 531                 if (name == NULL)
 532                         goto out_problem;
 533
 534                 map->dso->short_name = name;
 535                 map->dso->sname_alloc = 1;
 536                 map->end = map->start + self->mmap.len;
 537         } else if (is_kernel_mmap) {
 538                 const char *symbol_name = (self->mmap.filename +
 539                                 strlen(kmmap_prefix));
 540                 /*
 541                  * Should be there already, from the build-id table in
 542                  * the header.
 543                  */
 544                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 545                                                      kmmap_prefix);
 546                 if (kernel == NULL)
 547                         goto out_problem;
 548
 549                 kernel->kernel = kernel_type;
 550                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 551                         goto out_problem;
 552
 553                 event_set_kernel_mmap_len(machine->vmlinux_maps, self);
 554                 perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 555                                                          symbol_name,
 556                                                          self->mmap.pgoff);
 557                 if (machine__is_default_guest(machine)) {
 558                         /*
 559                          * preload dso of guest kernel and modules
 560                          */
 561                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
 562                                   NULL);
 563                 }
 564         }
 565         return 0;
 566 out_problem:
 567         return -1;
 568 }
 569
 570 int event__process_mmap(event_t *self, struct sample_data *sample __used,
 571                         struct perf_session *session)
 572 {
 573         struct machine *machine;
 574         struct thread *thread;
 575         struct map *map;
 576         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 577         int ret = 0;
 578
 579         dump_printf(" %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %s\n",
 580                         self->mmap.pid, self->mmap.tid, self->mmap.start,
 581                         self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 582
 583         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
 584             cpumode == PERF_RECORD_MISC_KERNEL) {
 585                 ret = event__process_kernel_mmap(self, session);
 586                 if (ret < 0)
 587                         goto out_problem;
 588                 return 0;
 589         }
 590
 591         machine = perf_session__find_host_machine(session);
 592         if (machine == NULL)
 593                 goto out_problem;
 594         thread = perf_session__findnew(session, self->mmap.pid);
 595         if (thread == NULL)
 596                 goto out_problem;
 597         map = map__new(&machine->user_dsos, self->mmap.start,
 598                         self->mmap.len, self->mmap.pgoff,
 599                         self->mmap.pid, self->mmap.filename,
 600                         MAP__FUNCTION);
 601         if (map == NULL)
 602                 goto out_problem;
 603
 604         thread__insert_map(thread, map);
 605         return 0;
 606
 607 out_problem:
 608         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 609         return 0;
 610 }
 611
 612 int event__process_task(event_t *self, struct sample_data *sample __used,
 613                         struct perf_session *session)
 614 {
 615         struct thread *thread = perf_session__findnew(session, self->fork.tid);
 616         struct thread *parent = perf_session__findnew(session, self->fork.ptid);
 617
 618         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 619                     self->fork.ppid, self->fork.ptid);
 620
 621         if (self->header.type == PERF_RECORD_EXIT) {
 622                 perf_session__remove_thread(session, thread);
 623                 return 0;
 624         }
 625
 626         if (thread == NULL || parent == NULL ||
 627             thread__fork(thread, parent) < 0) {
 628                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635 int event__process(event_t *event, struct sample_data *sample,
 636                    struct perf_session *session)
 637 {
 638         switch (event->header.type) {
 639         case PERF_RECORD_COMM:
 640                 event__process_comm(event, sample, session);
 641                 break;
 642         case PERF_RECORD_MMAP:
 643                 event__process_mmap(event, sample, session);
 644                 break;
 645         case PERF_RECORD_FORK:
 646         case PERF_RECORD_EXIT:
 647                 event__process_task(event, sample, session);
 648                 break;
 649         default:
 650                 break;
 651         }
 652
 653         return 0;
 654 }
 655
 656 void thread__find_addr_map(struct thread *self,
 657                            struct perf_session *session, u8 cpumode,
 658                            enum map_type type, pid_t pid, u64 addr,
 659                            struct addr_location *al)
 660 {
 661         struct map_groups *mg = &self->mg;
 662         struct machine *machine = NULL;
 663
 664         al->thread = self;
 665         al->addr = addr;
 666         al->cpumode = cpumode;
 667         al->filtered = false;
 668
 669         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 670                 al->level = 'k';
 671                 machine = perf_session__find_host_machine(session);
 672                 if (machine == NULL) {
 673                         al->map = NULL;
 674                         return;
 675                 }
 676                 mg = &machine->kmaps;
 677         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 678                 al->level = '.';
 679                 machine = perf_session__find_host_machine(session);
 680         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 681                 al->level = 'g';
 682                 machine = perf_session__find_machine(session, pid);
 683                 if (machine == NULL) {
 684                         al->map = NULL;
 685                         return;
 686                 }
 687                 mg = &machine->kmaps;
 688         } else {
 689                 /*
 690                  * 'u' means guest os user space.
 691                  * TODO: We don't support guest user space. Might support late.
 692                  */
 693                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
 694                         al->level = 'u';
 695                 else
 696                         al->level = 'H';
 697                 al->map = NULL;
 698
 699                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 700                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 701                         !perf_guest)
 702                         al->filtered = true;
 703                 if ((cpumode == PERF_RECORD_MISC_USER ||
 704                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 705                         !perf_host)
 706                         al->filtered = true;
 707
 708                 return;
 709         }
 710 try_again:
 711         al->map = map_groups__find(mg, type, al->addr);
 712         if (al->map == NULL) {
 713                 /*
 714                  * If this is outside of all known maps, and is a negative
 715                  * address, try to look it up in the kernel dso, as it might be
 716                  * a vsyscall or vdso (which executes in user-mode).
 717                  *
 718                  * XXX This is nasty, we should have a symbol list in the
 719                  * "[vdso]" dso, but for now lets use the old trick of looking
 720                  * in the whole kernel symbol list.
 721                  */
 722                 if ((long long)al->addr < 0 &&
 723                     cpumode == PERF_RECORD_MISC_KERNEL &&
 724                     machine && mg != &machine->kmaps) {
 725                         mg = &machine->kmaps;
 726                         goto try_again;
 727                 }
 728         } else
 729                 al->addr = al->map->map_ip(al->map, al->addr);
 730 }
 731
 732 void thread__find_addr_location(struct thread *self,
 733                                 struct perf_session *session, u8 cpumode,
 734                                 enum map_type type, pid_t pid, u64 addr,
 735                                 struct addr_location *al,
 736                                 symbol_filter_t filter)
 737 {
 738         thread__find_addr_map(self, session, cpumode, type, pid, addr, al);
 739         if (al->map != NULL)
 740                 al->sym = map__find_symbol(al->map, al->addr, filter);
 741         else
 742                 al->sym = NULL;
 743 }
 744
 745 static void dso__calc_col_width(struct dso *self, struct hists *hists)
 746 {
 747         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 748             (!symbol_conf.dso_list ||
 749              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 750                 u16 slen = dso__name_len(self);
 751                 hists__new_col_len(hists, HISTC_DSO, slen);
 752         }
 753
 754         self->slen_calculated = 1;
 755 }
 756
 757 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 758                              struct addr_location *al, struct sample_data *data,
 759                              symbol_filter_t filter)
 760 {
 761         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 762         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 763
 764         if (thread == NULL)
 765                 return -1;
 766
 767         if (symbol_conf.comm_list &&
 768             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 769                 goto out_filtered;
 770
 771         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 772         /*
 773          * Have we already created the kernel maps for the host machine?
 774          *
 775          * This should have happened earlier, when we processed the kernel MMAP
 776          * events, but for older perf.data files there was no such thing, so do
 777          * it now.
 778          */
 779         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 780             session->host_machine.vmlinux_maps[MAP__FUNCTION] == NULL)
 781                 machine__create_kernel_maps(&session->host_machine);
 782
 783         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
 784                               self->ip.pid, self->ip.ip, al);
 785         dump_printf(" ...... dso: %s\n",
 786                     al->map ? al->map->dso->long_name :
 787                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 788         al->sym = NULL;
 789         al->cpu = data->cpu;
 790
 791         if (al->map) {
 792                 if (symbol_conf.dso_list &&
 793                     (!al->map || !al->map->dso ||
 794                      !(strlist__has_entry(symbol_conf.dso_list,
 795                                           al->map->dso->short_name) ||
 796                        (al->map->dso->short_name != al->map->dso->long_name &&
 797                         strlist__has_entry(symbol_conf.dso_list,
 798                                            al->map->dso->long_name)))))
 799                         goto out_filtered;
 800                 /*
 801                  * We have to do this here as we may have a dso with no symbol
 802                  * hit that has a name longer than the ones with symbols
 803                  * sampled.
 804                  */
 805                 if (!sort_dso.elide && !al->map->dso->slen_calculated)
 806                         dso__calc_col_width(al->map->dso, &session->hists);
 807
 808                 al->sym = map__find_symbol(al->map, al->addr, filter);
 809         } else {
 810                 const unsigned int unresolved_col_width = BITS_PER_LONG / 4;
 811
 812                 if (hists__col_len(&session->hists, HISTC_DSO) < unresolved_col_width &&
 813                     !symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 814                     !symbol_conf.dso_list)
 815                         hists__set_col_len(&session->hists, HISTC_DSO,
 816                                            unresolved_col_width);
 817         }
 818
 819         if (symbol_conf.sym_list && al->sym &&
 820             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 821                 goto out_filtered;
 822
 823         return 0;
 824
 825 out_filtered:
 826         al->filtered = true;
 827         return 0;
 828 }