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