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