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:%Ld: lost:%Ld\n", self->lost.id, self->lost.lost);
 463         session->hists.stats.total_lost += self->lost.lost;
 464         return 0;
 465 }
 466
 467 static void event_set_kernel_mmap_len(struct map **maps, event_t *self)
 468 {
 469         maps[MAP__FUNCTION]->start = self->mmap.start;
 470         maps[MAP__FUNCTION]->end   = self->mmap.start + self->mmap.len;
 471         /*
 472          * Be a bit paranoid here, some perf.data file came with
 473          * a zero sized synthesized MMAP event for the kernel.
 474          */
 475         if (maps[MAP__FUNCTION]->end == 0)
 476                 maps[MAP__FUNCTION]->end = ~0ULL;
 477 }
 478
 479 static int event__process_kernel_mmap(event_t *self,
 480                         struct perf_session *session)
 481 {
 482         struct map *map;
 483         char kmmap_prefix[PATH_MAX];
 484         struct machine *machine;
 485         enum dso_kernel_type kernel_type;
 486         bool is_kernel_mmap;
 487
 488         machine = perf_session__findnew_machine(session, self->mmap.pid);
 489         if (!machine) {
 490                 pr_err("Can't find id %d's machine\n", self->mmap.pid);
 491                 goto out_problem;
 492         }
 493
 494         machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
 495         if (machine__is_host(machine))
 496                 kernel_type = DSO_TYPE_KERNEL;
 497         else
 498                 kernel_type = DSO_TYPE_GUEST_KERNEL;
 499
 500         is_kernel_mmap = memcmp(self->mmap.filename,
 501                                 kmmap_prefix,
 502                                 strlen(kmmap_prefix)) == 0;
 503         if (self->mmap.filename[0] == '/' ||
 504             (!is_kernel_mmap && self->mmap.filename[0] == '[')) {
 505
 506                 char short_module_name[1024];
 507                 char *name, *dot;
 508
 509                 if (self->mmap.filename[0] == '/') {
 510                         name = strrchr(self->mmap.filename, '/');
 511                         if (name == NULL)
 512                                 goto out_problem;
 513
 514                         ++name; /* skip / */
 515                         dot = strrchr(name, '.');
 516                         if (dot == NULL)
 517                                 goto out_problem;
 518                         snprintf(short_module_name, sizeof(short_module_name),
 519                                         "[%.*s]", (int)(dot - name), name);
 520                         strxfrchar(short_module_name, '-', '_');
 521                 } else
 522                         strcpy(short_module_name, self->mmap.filename);
 523
 524                 map = machine__new_module(machine, self->mmap.start,
 525                                           self->mmap.filename);
 526                 if (map == NULL)
 527                         goto out_problem;
 528
 529                 name = strdup(short_module_name);
 530                 if (name == NULL)
 531                         goto out_problem;
 532
 533                 map->dso->short_name = name;
 534                 map->dso->sname_alloc = 1;
 535                 map->end = map->start + self->mmap.len;
 536         } else if (is_kernel_mmap) {
 537                 const char *symbol_name = (self->mmap.filename +
 538                                 strlen(kmmap_prefix));
 539                 /*
 540                  * Should be there already, from the build-id table in
 541                  * the header.
 542                  */
 543                 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
 544                                                      kmmap_prefix);
 545                 if (kernel == NULL)
 546                         goto out_problem;
 547
 548                 kernel->kernel = kernel_type;
 549                 if (__machine__create_kernel_maps(machine, kernel) < 0)
 550                         goto out_problem;
 551
 552                 event_set_kernel_mmap_len(machine->vmlinux_maps, self);
 553                 perf_session__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
 554                                                          symbol_name,
 555                                                          self->mmap.pgoff);
 556                 if (machine__is_default_guest(machine)) {
 557                         /*
 558                          * preload dso of guest kernel and modules
 559                          */
 560                         dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
 561                                   NULL);
 562                 }
 563         }
 564         return 0;
 565 out_problem:
 566         return -1;
 567 }
 568
 569 int event__process_mmap(event_t *self, struct sample_data *sample __used,
 570                         struct perf_session *session)
 571 {
 572         struct machine *machine;
 573         struct thread *thread;
 574         struct map *map;
 575         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 576         int ret = 0;
 577
 578         dump_printf(" %d/%d: [%#Lx(%#Lx) @ %#Lx]: %s\n",
 579                         self->mmap.pid, self->mmap.tid, self->mmap.start,
 580                         self->mmap.len, self->mmap.pgoff, self->mmap.filename);
 581
 582         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
 583             cpumode == PERF_RECORD_MISC_KERNEL) {
 584                 ret = event__process_kernel_mmap(self, session);
 585                 if (ret < 0)
 586                         goto out_problem;
 587                 return 0;
 588         }
 589
 590         machine = perf_session__find_host_machine(session);
 591         if (machine == NULL)
 592                 goto out_problem;
 593         thread = perf_session__findnew(session, self->mmap.pid);
 594         if (thread == NULL)
 595                 goto out_problem;
 596         map = map__new(&machine->user_dsos, self->mmap.start,
 597                         self->mmap.len, self->mmap.pgoff,
 598                         self->mmap.pid, self->mmap.filename,
 599                         MAP__FUNCTION);
 600         if (map == NULL)
 601                 goto out_problem;
 602
 603         thread__insert_map(thread, map);
 604         return 0;
 605
 606 out_problem:
 607         dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
 608         return 0;
 609 }
 610
 611 int event__process_task(event_t *self, struct sample_data *sample __used,
 612                         struct perf_session *session)
 613 {
 614         struct thread *thread = perf_session__findnew(session, self->fork.tid);
 615         struct thread *parent = perf_session__findnew(session, self->fork.ptid);
 616
 617         dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
 618                     self->fork.ppid, self->fork.ptid);
 619
 620         if (self->header.type == PERF_RECORD_EXIT) {
 621                 perf_session__remove_thread(session, thread);
 622                 return 0;
 623         }
 624
 625         if (thread == NULL || parent == NULL ||
 626             thread__fork(thread, parent) < 0) {
 627                 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
 628                 return -1;
 629         }
 630
 631         return 0;
 632 }
 633
 634 int event__process(event_t *event, struct sample_data *sample,
 635                    struct perf_session *session)
 636 {
 637         switch (event->header.type) {
 638         case PERF_RECORD_COMM:
 639                 event__process_comm(event, sample, session);
 640                 break;
 641         case PERF_RECORD_MMAP:
 642                 event__process_mmap(event, sample, session);
 643                 break;
 644         case PERF_RECORD_FORK:
 645         case PERF_RECORD_EXIT:
 646                 event__process_task(event, sample, session);
 647                 break;
 648         default:
 649                 break;
 650         }
 651
 652         return 0;
 653 }
 654
 655 void thread__find_addr_map(struct thread *self,
 656                            struct perf_session *session, u8 cpumode,
 657                            enum map_type type, pid_t pid, u64 addr,
 658                            struct addr_location *al)
 659 {
 660         struct map_groups *mg = &self->mg;
 661         struct machine *machine = NULL;
 662
 663         al->thread = self;
 664         al->addr = addr;
 665         al->cpumode = cpumode;
 666         al->filtered = false;
 667
 668         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 669                 al->level = 'k';
 670                 machine = perf_session__find_host_machine(session);
 671                 if (machine == NULL) {
 672                         al->map = NULL;
 673                         return;
 674                 }
 675                 mg = &machine->kmaps;
 676         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 677                 al->level = '.';
 678                 machine = perf_session__find_host_machine(session);
 679         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 680                 al->level = 'g';
 681                 machine = perf_session__find_machine(session, pid);
 682                 if (machine == NULL) {
 683                         al->map = NULL;
 684                         return;
 685                 }
 686                 mg = &machine->kmaps;
 687         } else {
 688                 /*
 689                  * 'u' means guest os user space.
 690                  * TODO: We don't support guest user space. Might support late.
 691                  */
 692                 if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest)
 693                         al->level = 'u';
 694                 else
 695                         al->level = 'H';
 696                 al->map = NULL;
 697
 698                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 699                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 700                         !perf_guest)
 701                         al->filtered = true;
 702                 if ((cpumode == PERF_RECORD_MISC_USER ||
 703                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 704                         !perf_host)
 705                         al->filtered = true;
 706
 707                 return;
 708         }
 709 try_again:
 710         al->map = map_groups__find(mg, type, al->addr);
 711         if (al->map == NULL) {
 712                 /*
 713                  * If this is outside of all known maps, and is a negative
 714                  * address, try to look it up in the kernel dso, as it might be
 715                  * a vsyscall or vdso (which executes in user-mode).
 716                  *
 717                  * XXX This is nasty, we should have a symbol list in the
 718                  * "[vdso]" dso, but for now lets use the old trick of looking
 719                  * in the whole kernel symbol list.
 720                  */
 721                 if ((long long)al->addr < 0 &&
 722                     cpumode == PERF_RECORD_MISC_KERNEL &&
 723                     machine && mg != &machine->kmaps) {
 724                         mg = &machine->kmaps;
 725                         goto try_again;
 726                 }
 727         } else
 728                 al->addr = al->map->map_ip(al->map, al->addr);
 729 }
 730
 731 void thread__find_addr_location(struct thread *self,
 732                                 struct perf_session *session, u8 cpumode,
 733                                 enum map_type type, pid_t pid, u64 addr,
 734                                 struct addr_location *al,
 735                                 symbol_filter_t filter)
 736 {
 737         thread__find_addr_map(self, session, cpumode, type, pid, addr, al);
 738         if (al->map != NULL)
 739                 al->sym = map__find_symbol(al->map, al->addr, filter);
 740         else
 741                 al->sym = NULL;
 742 }
 743
 744 static void dso__calc_col_width(struct dso *self, struct hists *hists)
 745 {
 746         if (!symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 747             (!symbol_conf.dso_list ||
 748              strlist__has_entry(symbol_conf.dso_list, self->name))) {
 749                 u16 slen = dso__name_len(self);
 750                 hists__new_col_len(hists, HISTC_DSO, slen);
 751         }
 752
 753         self->slen_calculated = 1;
 754 }
 755
 756 int event__preprocess_sample(const event_t *self, struct perf_session *session,
 757                              struct addr_location *al, struct sample_data *data,
 758                              symbol_filter_t filter)
 759 {
 760         u8 cpumode = self->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 761         struct thread *thread = perf_session__findnew(session, self->ip.pid);
 762
 763         if (thread == NULL)
 764                 return -1;
 765
 766         if (symbol_conf.comm_list &&
 767             !strlist__has_entry(symbol_conf.comm_list, thread->comm))
 768                 goto out_filtered;
 769
 770         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 771         /*
 772          * Have we already created the kernel maps for the host machine?
 773          *
 774          * This should have happened earlier, when we processed the kernel MMAP
 775          * events, but for older perf.data files there was no such thing, so do
 776          * it now.
 777          */
 778         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 779             session->host_machine.vmlinux_maps[MAP__FUNCTION] == NULL)
 780                 machine__create_kernel_maps(&session->host_machine);
 781
 782         thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
 783                               self->ip.pid, self->ip.ip, al);
 784         dump_printf(" ...... dso: %s\n",
 785                     al->map ? al->map->dso->long_name :
 786                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 787         al->sym = NULL;
 788         al->cpu = data->cpu;
 789
 790         if (al->map) {
 791                 if (symbol_conf.dso_list &&
 792                     (!al->map || !al->map->dso ||
 793                      !(strlist__has_entry(symbol_conf.dso_list,
 794                                           al->map->dso->short_name) ||
 795                        (al->map->dso->short_name != al->map->dso->long_name &&
 796                         strlist__has_entry(symbol_conf.dso_list,
 797                                            al->map->dso->long_name)))))
 798                         goto out_filtered;
 799                 /*
 800                  * We have to do this here as we may have a dso with no symbol
 801                  * hit that has a name longer than the ones with symbols
 802                  * sampled.
 803                  */
 804                 if (!sort_dso.elide && !al->map->dso->slen_calculated)
 805                         dso__calc_col_width(al->map->dso, &session->hists);
 806
 807                 al->sym = map__find_symbol(al->map, al->addr, filter);
 808         } else {
 809                 const unsigned int unresolved_col_width = BITS_PER_LONG / 4;
 810
 811                 if (hists__col_len(&session->hists, HISTC_DSO) < unresolved_col_width &&
 812                     !symbol_conf.col_width_list_str && !symbol_conf.field_sep &&
 813                     !symbol_conf.dso_list)
 814                         hists__set_col_len(&session->hists, HISTC_DSO,
 815                                            unresolved_col_width);
 816         }
 817
 818         if (symbol_conf.sym_list && al->sym &&
 819             !strlist__has_entry(symbol_conf.sym_list, al->sym->name))
 820                 goto out_filtered;
 821
 822         return 0;
 823
 824 out_filtered:
 825         al->filtered = true;
 826         return 0;
 827 }
 828
 829 static int event__parse_id_sample(const event_t *event,
 830                                   struct perf_session *session,
 831                                   struct sample_data *sample)
 832 {
 833         const u64 *array;
 834         u64 type;
 835
 836         sample->cpu = sample->pid = sample->tid = -1;
 837         sample->stream_id = sample->id = sample->time = -1ULL;
 838
 839         if (!session->sample_id_all)
 840                 return 0;
 841
 842         array = event->sample.array;
 843         array += ((event->header.size -
 844                    sizeof(event->header)) / sizeof(u64)) - 1;
 845         type = session->sample_type;
 846
 847         if (type & PERF_SAMPLE_CPU) {
 848                 u32 *p = (u32 *)array;
 849                 sample->cpu = *p;
 850                 array--;
 851         }
 852
 853         if (type & PERF_SAMPLE_STREAM_ID) {
 854                 sample->stream_id = *array;
 855                 array--;
 856         }
 857
 858         if (type & PERF_SAMPLE_ID) {
 859                 sample->id = *array;
 860                 array--;
 861         }
 862
 863         if (type & PERF_SAMPLE_TIME) {
 864                 sample->time = *array;
 865                 array--;
 866         }
 867
 868         if (type & PERF_SAMPLE_TID) {
 869                 u32 *p = (u32 *)array;
 870                 sample->pid = p[0];
 871                 sample->tid = p[1];
 872         }
 873
 874         return 0;
 875 }
 876
 877 int event__parse_sample(const event_t *event, struct perf_session *session,
 878                         struct sample_data *data)
 879 {
 880         const u64 *array;
 881         u64 type;
 882
 883         if (event->header.type != PERF_RECORD_SAMPLE)
 884                 return event__parse_id_sample(event, session, data);
 885
 886         array = event->sample.array;
 887         type = session->sample_type;
 888
 889         if (type & PERF_SAMPLE_IP) {
 890                 data->ip = event->ip.ip;
 891                 array++;
 892         }
 893
 894         if (type & PERF_SAMPLE_TID) {
 895                 u32 *p = (u32 *)array;
 896                 data->pid = p[0];
 897                 data->tid = p[1];
 898                 array++;
 899         }
 900
 901         if (type & PERF_SAMPLE_TIME) {
 902                 data->time = *array;
 903                 array++;
 904         }
 905
 906         if (type & PERF_SAMPLE_ADDR) {
 907                 data->addr = *array;
 908                 array++;
 909         }
 910
 911         data->id = -1ULL;
 912         if (type & PERF_SAMPLE_ID) {
 913                 data->id = *array;
 914                 array++;
 915         }
 916
 917         if (type & PERF_SAMPLE_STREAM_ID) {
 918                 data->stream_id = *array;
 919                 array++;
 920         }
 921
 922         if (type & PERF_SAMPLE_CPU) {
 923                 u32 *p = (u32 *)array;
 924                 data->cpu = *p;
 925                 array++;
 926         } else
 927                 data->cpu = -1;
 928
 929         if (type & PERF_SAMPLE_PERIOD) {
 930                 data->period = *array;
 931                 array++;
 932         }
 933
 934         if (type & PERF_SAMPLE_READ) {
 935                 pr_debug("PERF_SAMPLE_READ is unsuported for now\n");
 936                 return -1;
 937         }
 938
 939         if (type & PERF_SAMPLE_CALLCHAIN) {
 940                 data->callchain = (struct ip_callchain *)array;
 941                 array += 1 + data->callchain->nr;
 942         }
 943
 944         if (type & PERF_SAMPLE_RAW) {
 945                 u32 *p = (u32 *)array;
 946                 data->raw_size = *p;
 947                 p++;
 948                 data->raw_data = p;
 949         }
 950
 951         return 0;
 952 }