tools/perf/util/session.c

   1 #define _FILE_OFFSET_BITS 64
   2
   3 #include <linux/kernel.h>
   4
   5 #include <byteswap.h>
   6 #include <unistd.h>
   7 #include <sys/types.h>
   8 #include <sys/mman.h>
   9
  10 #include "evlist.h"
  11 #include "evsel.h"
  12 #include "session.h"
  13 #include "sort.h"
  14 #include "util.h"
  15 #include "cpumap.h"
  16
  17 static int perf_session__open(struct perf_session *self, bool force)
  18 {
  19         struct stat input_stat;
  20
  21         if (!strcmp(self->filename, "-")) {
  22                 self->fd_pipe = true;
  23                 self->fd = STDIN_FILENO;
  24
  25                 if (perf_session__read_header(self, self->fd) < 0)
  26                         pr_err("incompatible file format");
  27
  28                 return 0;
  29         }
  30
  31         self->fd = open(self->filename, O_RDONLY);
  32         if (self->fd < 0) {
  33                 int err = errno;
  34
  35                 pr_err("failed to open %s: %s", self->filename, strerror(err));
  36                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
  37                         pr_err("  (try 'perf record' first)");
  38                 pr_err("\n");
  39                 return -errno;
  40         }
  41
  42         if (fstat(self->fd, &input_stat) < 0)
  43                 goto out_close;
  44
  45         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  46                 pr_err("file %s not owned by current user or root\n",
  47                        self->filename);
  48                 goto out_close;
  49         }
  50
  51         if (!input_stat.st_size) {
  52                 pr_info("zero-sized file (%s), nothing to do!\n",
  53                         self->filename);
  54                 goto out_close;
  55         }
  56
  57         if (perf_session__read_header(self, self->fd) < 0) {
  58                 pr_err("incompatible file format");
  59                 goto out_close;
  60         }
  61
  62         if (!perf_evlist__valid_sample_type(self->evlist)) {
  63                 pr_err("non matching sample_type");
  64                 goto out_close;
  65         }
  66
  67         if (!perf_evlist__valid_sample_id_all(self->evlist)) {
  68                 pr_err("non matching sample_id_all");
  69                 goto out_close;
  70         }
  71
  72         self->size = input_stat.st_size;
  73         return 0;
  74
  75 out_close:
  76         close(self->fd);
  77         self->fd = -1;
  78         return -1;
  79 }
  80
  81 static void perf_session__id_header_size(struct perf_session *session)
  82 {
  83        struct perf_sample *data;
  84        u64 sample_type = session->sample_type;
  85        u16 size = 0;
  86
  87         if (!session->sample_id_all)
  88                 goto out;
  89
  90        if (sample_type & PERF_SAMPLE_TID)
  91                size += sizeof(data->tid) * 2;
  92
  93        if (sample_type & PERF_SAMPLE_TIME)
  94                size += sizeof(data->time);
  95
  96        if (sample_type & PERF_SAMPLE_ID)
  97                size += sizeof(data->id);
  98
  99        if (sample_type & PERF_SAMPLE_STREAM_ID)
 100                size += sizeof(data->stream_id);
 101
 102        if (sample_type & PERF_SAMPLE_CPU)
 103                size += sizeof(data->cpu) * 2;
 104 out:
 105        session->id_hdr_size = size;
 106 }
 107
 108 void perf_session__update_sample_type(struct perf_session *self)
 109 {
 110         self->sample_type = perf_evlist__sample_type(self->evlist);
 111         self->sample_size = __perf_evsel__sample_size(self->sample_type);
 112         self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
 113         perf_session__id_header_size(self);
 114 }
 115
 116 int perf_session__create_kernel_maps(struct perf_session *self)
 117 {
 118         int ret = machine__create_kernel_maps(&self->host_machine);
 119
 120         if (ret >= 0)
 121                 ret = machines__create_guest_kernel_maps(&self->machines);
 122         return ret;
 123 }
 124
 125 static void perf_session__destroy_kernel_maps(struct perf_session *self)
 126 {
 127         machine__destroy_kernel_maps(&self->host_machine);
 128         machines__destroy_guest_kernel_maps(&self->machines);
 129 }
 130
 131 struct perf_session *perf_session__new(const char *filename, int mode,
 132                                        bool force, bool repipe,
 133                                        struct perf_event_ops *ops)
 134 {
 135         size_t len = filename ? strlen(filename) + 1 : 0;
 136         struct perf_session *self = zalloc(sizeof(*self) + len);
 137
 138         if (self == NULL)
 139                 goto out;
 140
 141         memcpy(self->filename, filename, len);
 142         self->threads = RB_ROOT;
 143         INIT_LIST_HEAD(&self->dead_threads);
 144         self->last_match = NULL;
 145         /*
 146          * On 64bit we can mmap the data file in one go. No need for tiny mmap
 147          * slices. On 32bit we use 32MB.
 148          */
 149 #if BITS_PER_LONG == 64
 150         self->mmap_window = ULLONG_MAX;
 151 #else
 152         self->mmap_window = 32 * 1024 * 1024ULL;
 153 #endif
 154         self->machines = RB_ROOT;
 155         self->repipe = repipe;
 156         INIT_LIST_HEAD(&self->ordered_samples.samples);
 157         INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
 158         INIT_LIST_HEAD(&self->ordered_samples.to_free);
 159         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 160
 161         if (mode == O_RDONLY) {
 162                 if (perf_session__open(self, force) < 0)
 163                         goto out_delete;
 164                 perf_session__update_sample_type(self);
 165         } else if (mode == O_WRONLY) {
 166                 /*
 167                  * In O_RDONLY mode this will be performed when reading the
 168                  * kernel MMAP event, in perf_event__process_mmap().
 169                  */
 170                 if (perf_session__create_kernel_maps(self) < 0)
 171                         goto out_delete;
 172         }
 173
 174         if (ops && ops->ordering_requires_timestamps &&
 175             ops->ordered_samples && !self->sample_id_all) {
 176                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 177                 ops->ordered_samples = false;
 178         }
 179
 180 out:
 181         return self;
 182 out_delete:
 183         perf_session__delete(self);
 184         return NULL;
 185 }
 186
 187 static void perf_session__delete_dead_threads(struct perf_session *self)
 188 {
 189         struct thread *n, *t;
 190
 191         list_for_each_entry_safe(t, n, &self->dead_threads, node) {
 192                 list_del(&t->node);
 193                 thread__delete(t);
 194         }
 195 }
 196
 197 static void perf_session__delete_threads(struct perf_session *self)
 198 {
 199         struct rb_node *nd = rb_first(&self->threads);
 200
 201         while (nd) {
 202                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 203
 204                 rb_erase(&t->rb_node, &self->threads);
 205                 nd = rb_next(nd);
 206                 thread__delete(t);
 207         }
 208 }
 209
 210 void perf_session__delete(struct perf_session *self)
 211 {
 212         perf_session__destroy_kernel_maps(self);
 213         perf_session__delete_dead_threads(self);
 214         perf_session__delete_threads(self);
 215         machine__exit(&self->host_machine);
 216         close(self->fd);
 217         free(self);
 218 }
 219
 220 void perf_session__remove_thread(struct perf_session *self, struct thread *th)
 221 {
 222         self->last_match = NULL;
 223         rb_erase(&th->rb_node, &self->threads);
 224         /*
 225          * We may have references to this thread, for instance in some hist_entry
 226          * instances, so just move them to a separate list.
 227          */
 228         list_add_tail(&th->node, &self->dead_threads);
 229 }
 230
 231 static bool symbol__match_parent_regex(struct symbol *sym)
 232 {
 233         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 234                 return 1;
 235
 236         return 0;
 237 }
 238
 239 int perf_session__resolve_callchain(struct perf_session *self,
 240                                     struct thread *thread,
 241                                     struct ip_callchain *chain,
 242                                     struct symbol **parent)
 243 {
 244         u8 cpumode = PERF_RECORD_MISC_USER;
 245         unsigned int i;
 246         int err;
 247
 248         callchain_cursor_reset(&self->callchain_cursor);
 249
 250         for (i = 0; i < chain->nr; i++) {
 251                 u64 ip;
 252                 struct addr_location al;
 253
 254                 if (callchain_param.order == ORDER_CALLEE)
 255                         ip = chain->ips[i];
 256                 else
 257                         ip = chain->ips[chain->nr - i - 1];
 258
 259                 if (ip >= PERF_CONTEXT_MAX) {
 260                         switch (ip) {
 261                         case PERF_CONTEXT_HV:
 262                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 263                         case PERF_CONTEXT_KERNEL:
 264                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 265                         case PERF_CONTEXT_USER:
 266                                 cpumode = PERF_RECORD_MISC_USER;        break;
 267                         default:
 268                                 break;
 269                         }
 270                         continue;
 271                 }
 272
 273                 al.filtered = false;
 274                 thread__find_addr_location(thread, self, cpumode,
 275                                 MAP__FUNCTION, thread->pid, ip, &al, NULL);
 276                 if (al.sym != NULL) {
 277                         if (sort__has_parent && !*parent &&
 278                             symbol__match_parent_regex(al.sym))
 279                                 *parent = al.sym;
 280                         if (!symbol_conf.use_callchain)
 281                                 break;
 282                 }
 283
 284                 err = callchain_cursor_append(&self->callchain_cursor,
 285                                               ip, al.map, al.sym);
 286                 if (err)
 287                         return err;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int process_event_synth_stub(union perf_event *event __used,
 294                                     struct perf_session *session __used)
 295 {
 296         dump_printf(": unhandled!\n");
 297         return 0;
 298 }
 299
 300 static int process_event_sample_stub(union perf_event *event __used,
 301                                      struct perf_sample *sample __used,
 302                                      struct perf_evsel *evsel __used,
 303                                      struct perf_session *session __used)
 304 {
 305         dump_printf(": unhandled!\n");
 306         return 0;
 307 }
 308
 309 static int process_event_stub(union perf_event *event __used,
 310                               struct perf_sample *sample __used,
 311                               struct perf_session *session __used)
 312 {
 313         dump_printf(": unhandled!\n");
 314         return 0;
 315 }
 316
 317 static int process_finished_round_stub(union perf_event *event __used,
 318                                        struct perf_session *session __used,
 319                                        struct perf_event_ops *ops __used)
 320 {
 321         dump_printf(": unhandled!\n");
 322         return 0;
 323 }
 324
 325 static int process_finished_round(union perf_event *event,
 326                                   struct perf_session *session,
 327                                   struct perf_event_ops *ops);
 328
 329 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
 330 {
 331         if (handler->sample == NULL)
 332                 handler->sample = process_event_sample_stub;
 333         if (handler->mmap == NULL)
 334                 handler->mmap = process_event_stub;
 335         if (handler->comm == NULL)
 336                 handler->comm = process_event_stub;
 337         if (handler->fork == NULL)
 338                 handler->fork = process_event_stub;
 339         if (handler->exit == NULL)
 340                 handler->exit = process_event_stub;
 341         if (handler->lost == NULL)
 342                 handler->lost = perf_event__process_lost;
 343         if (handler->read == NULL)
 344                 handler->read = process_event_stub;
 345         if (handler->throttle == NULL)
 346                 handler->throttle = process_event_stub;
 347         if (handler->unthrottle == NULL)
 348                 handler->unthrottle = process_event_stub;
 349         if (handler->attr == NULL)
 350                 handler->attr = process_event_synth_stub;
 351         if (handler->event_type == NULL)
 352                 handler->event_type = process_event_synth_stub;
 353         if (handler->tracing_data == NULL)
 354                 handler->tracing_data = process_event_synth_stub;
 355         if (handler->build_id == NULL)
 356                 handler->build_id = process_event_synth_stub;
 357         if (handler->finished_round == NULL) {
 358                 if (handler->ordered_samples)
 359                         handler->finished_round = process_finished_round;
 360                 else
 361                         handler->finished_round = process_finished_round_stub;
 362         }
 363 }
 364
 365 void mem_bswap_64(void *src, int byte_size)
 366 {
 367         u64 *m = src;
 368
 369         while (byte_size > 0) {
 370                 *m = bswap_64(*m);
 371                 byte_size -= sizeof(u64);
 372                 ++m;
 373         }
 374 }
 375
 376 static void perf_event__all64_swap(union perf_event *event)
 377 {
 378         struct perf_event_header *hdr = &event->header;
 379         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 380 }
 381
 382 static void perf_event__comm_swap(union perf_event *event)
 383 {
 384         event->comm.pid = bswap_32(event->comm.pid);
 385         event->comm.tid = bswap_32(event->comm.tid);
 386 }
 387
 388 static void perf_event__mmap_swap(union perf_event *event)
 389 {
 390         event->mmap.pid   = bswap_32(event->mmap.pid);
 391         event->mmap.tid   = bswap_32(event->mmap.tid);
 392         event->mmap.start = bswap_64(event->mmap.start);
 393         event->mmap.len   = bswap_64(event->mmap.len);
 394         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 395 }
 396
 397 static void perf_event__task_swap(union perf_event *event)
 398 {
 399         event->fork.pid  = bswap_32(event->fork.pid);
 400         event->fork.tid  = bswap_32(event->fork.tid);
 401         event->fork.ppid = bswap_32(event->fork.ppid);
 402         event->fork.ptid = bswap_32(event->fork.ptid);
 403         event->fork.time = bswap_64(event->fork.time);
 404 }
 405
 406 static void perf_event__read_swap(union perf_event *event)
 407 {
 408         event->read.pid          = bswap_32(event->read.pid);
 409         event->read.tid          = bswap_32(event->read.tid);
 410         event->read.value        = bswap_64(event->read.value);
 411         event->read.time_enabled = bswap_64(event->read.time_enabled);
 412         event->read.time_running = bswap_64(event->read.time_running);
 413         event->read.id           = bswap_64(event->read.id);
 414 }
 415
 416 /* exported for swapping attributes in file header */
 417 void perf_event__attr_swap(struct perf_event_attr *attr)
 418 {
 419         attr->type              = bswap_32(attr->type);
 420         attr->size              = bswap_32(attr->size);
 421         attr->config            = bswap_64(attr->config);
 422         attr->sample_period     = bswap_64(attr->sample_period);
 423         attr->sample_type       = bswap_64(attr->sample_type);
 424         attr->read_format       = bswap_64(attr->read_format);
 425         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 426         attr->bp_type           = bswap_32(attr->bp_type);
 427         attr->bp_addr           = bswap_64(attr->bp_addr);
 428         attr->bp_len            = bswap_64(attr->bp_len);
 429 }
 430
 431 static void perf_event__hdr_attr_swap(union perf_event *event)
 432 {
 433         size_t size;
 434
 435         perf_event__attr_swap(&event->attr.attr);
 436
 437         size = event->header.size;
 438         size -= (void *)&event->attr.id - (void *)event;
 439         mem_bswap_64(event->attr.id, size);
 440 }
 441
 442 static void perf_event__event_type_swap(union perf_event *event)
 443 {
 444         event->event_type.event_type.event_id =
 445                 bswap_64(event->event_type.event_type.event_id);
 446 }
 447
 448 static void perf_event__tracing_data_swap(union perf_event *event)
 449 {
 450         event->tracing_data.size = bswap_32(event->tracing_data.size);
 451 }
 452
 453 typedef void (*perf_event__swap_op)(union perf_event *event);
 454
 455 static perf_event__swap_op perf_event__swap_ops[] = {
 456         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 457         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 458         [PERF_RECORD_FORK]                = perf_event__task_swap,
 459         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 460         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 461         [PERF_RECORD_READ]                = perf_event__read_swap,
 462         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 463         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 464         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 465         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 466         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 467         [PERF_RECORD_HEADER_MAX]          = NULL,
 468 };
 469
 470 struct sample_queue {
 471         u64                     timestamp;
 472         u64                     file_offset;
 473         union perf_event        *event;
 474         struct list_head        list;
 475 };
 476
 477 static void perf_session_free_sample_buffers(struct perf_session *session)
 478 {
 479         struct ordered_samples *os = &session->ordered_samples;
 480
 481         while (!list_empty(&os->to_free)) {
 482                 struct sample_queue *sq;
 483
 484                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 485                 list_del(&sq->list);
 486                 free(sq);
 487         }
 488 }
 489
 490 static int perf_session_deliver_event(struct perf_session *session,
 491                                       union perf_event *event,
 492                                       struct perf_sample *sample,
 493                                       struct perf_event_ops *ops,
 494                                       u64 file_offset);
 495
 496 static void flush_sample_queue(struct perf_session *s,
 497                                struct perf_event_ops *ops)
 498 {
 499         struct ordered_samples *os = &s->ordered_samples;
 500         struct list_head *head = &os->samples;
 501         struct sample_queue *tmp, *iter;
 502         struct perf_sample sample;
 503         u64 limit = os->next_flush;
 504         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 505         int ret;
 506
 507         if (!ops->ordered_samples || !limit)
 508                 return;
 509
 510         list_for_each_entry_safe(iter, tmp, head, list) {
 511                 if (iter->timestamp > limit)
 512                         break;
 513
 514                 ret = perf_session__parse_sample(s, iter->event, &sample);
 515                 if (ret)
 516                         pr_err("Can't parse sample, err = %d\n", ret);
 517                 else
 518                         perf_session_deliver_event(s, iter->event, &sample, ops,
 519                                                    iter->file_offset);
 520
 521                 os->last_flush = iter->timestamp;
 522                 list_del(&iter->list);
 523                 list_add(&iter->list, &os->sample_cache);
 524         }
 525
 526         if (list_empty(head)) {
 527                 os->last_sample = NULL;
 528         } else if (last_ts <= limit) {
 529                 os->last_sample =
 530                         list_entry(head->prev, struct sample_queue, list);
 531         }
 532 }
 533
 534 /*
 535  * When perf record finishes a pass on every buffers, it records this pseudo
 536  * event.
 537  * We record the max timestamp t found in the pass n.
 538  * Assuming these timestamps are monotonic across cpus, we know that if
 539  * a buffer still has events with timestamps below t, they will be all
 540  * available and then read in the pass n + 1.
 541  * Hence when we start to read the pass n + 2, we can safely flush every
 542  * events with timestamps below t.
 543  *
 544  *    ============ PASS n =================
 545  *       CPU 0         |   CPU 1
 546  *                     |
 547  *    cnt1 timestamps  |   cnt2 timestamps
 548  *          1          |         2
 549  *          2          |         3
 550  *          -          |         4  <--- max recorded
 551  *
 552  *    ============ PASS n + 1 ==============
 553  *       CPU 0         |   CPU 1
 554  *                     |
 555  *    cnt1 timestamps  |   cnt2 timestamps
 556  *          3          |         5
 557  *          4          |         6
 558  *          5          |         7 <---- max recorded
 559  *
 560  *      Flush every events below timestamp 4
 561  *
 562  *    ============ PASS n + 2 ==============
 563  *       CPU 0         |   CPU 1
 564  *                     |
 565  *    cnt1 timestamps  |   cnt2 timestamps
 566  *          6          |         8
 567  *          7          |         9
 568  *          -          |         10
 569  *
 570  *      Flush every events below timestamp 7
 571  *      etc...
 572  */
 573 static int process_finished_round(union perf_event *event __used,
 574                                   struct perf_session *session,
 575                                   struct perf_event_ops *ops)
 576 {
 577         flush_sample_queue(session, ops);
 578         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 579
 580         return 0;
 581 }
 582
 583 /* The queue is ordered by time */
 584 static void __queue_event(struct sample_queue *new, struct perf_session *s)
 585 {
 586         struct ordered_samples *os = &s->ordered_samples;
 587         struct sample_queue *sample = os->last_sample;
 588         u64 timestamp = new->timestamp;
 589         struct list_head *p;
 590
 591         os->last_sample = new;
 592
 593         if (!sample) {
 594                 list_add(&new->list, &os->samples);
 595                 os->max_timestamp = timestamp;
 596                 return;
 597         }
 598
 599         /*
 600          * last_sample might point to some random place in the list as it's
 601          * the last queued event. We expect that the new event is close to
 602          * this.
 603          */
 604         if (sample->timestamp <= timestamp) {
 605                 while (sample->timestamp <= timestamp) {
 606                         p = sample->list.next;
 607                         if (p == &os->samples) {
 608                                 list_add_tail(&new->list, &os->samples);
 609                                 os->max_timestamp = timestamp;
 610                                 return;
 611                         }
 612                         sample = list_entry(p, struct sample_queue, list);
 613                 }
 614                 list_add_tail(&new->list, &sample->list);
 615         } else {
 616                 while (sample->timestamp > timestamp) {
 617                         p = sample->list.prev;
 618                         if (p == &os->samples) {
 619                                 list_add(&new->list, &os->samples);
 620                                 return;
 621                         }
 622                         sample = list_entry(p, struct sample_queue, list);
 623                 }
 624                 list_add(&new->list, &sample->list);
 625         }
 626 }
 627
 628 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
 629
 630 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 631                                     struct perf_sample *sample, u64 file_offset)
 632 {
 633         struct ordered_samples *os = &s->ordered_samples;
 634         struct list_head *sc = &os->sample_cache;
 635         u64 timestamp = sample->time;
 636         struct sample_queue *new;
 637
 638         if (!timestamp || timestamp == ~0ULL)
 639                 return -ETIME;
 640
 641         if (timestamp < s->ordered_samples.last_flush) {
 642                 printf("Warning: Timestamp below last timeslice flush\n");
 643                 return -EINVAL;
 644         }
 645
 646         if (!list_empty(sc)) {
 647                 new = list_entry(sc->next, struct sample_queue, list);
 648                 list_del(&new->list);
 649         } else if (os->sample_buffer) {
 650                 new = os->sample_buffer + os->sample_buffer_idx;
 651                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
 652                         os->sample_buffer = NULL;
 653         } else {
 654                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
 655                 if (!os->sample_buffer)
 656                         return -ENOMEM;
 657                 list_add(&os->sample_buffer->list, &os->to_free);
 658                 os->sample_buffer_idx = 2;
 659                 new = os->sample_buffer + 1;
 660         }
 661
 662         new->timestamp = timestamp;
 663         new->file_offset = file_offset;
 664         new->event = event;
 665
 666         __queue_event(new, s);
 667
 668         return 0;
 669 }
 670
 671 static void callchain__printf(struct perf_sample *sample)
 672 {
 673         unsigned int i;
 674
 675         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
 676
 677         for (i = 0; i < sample->callchain->nr; i++)
 678                 printf("..... %2d: %016" PRIx64 "\n",
 679                        i, sample->callchain->ips[i]);
 680 }
 681
 682 static void perf_session__print_tstamp(struct perf_session *session,
 683                                        union perf_event *event,
 684                                        struct perf_sample *sample)
 685 {
 686         if (event->header.type != PERF_RECORD_SAMPLE &&
 687             !session->sample_id_all) {
 688                 fputs("-1 -1 ", stdout);
 689                 return;
 690         }
 691
 692         if ((session->sample_type & PERF_SAMPLE_CPU))
 693                 printf("%u ", sample->cpu);
 694
 695         if (session->sample_type & PERF_SAMPLE_TIME)
 696                 printf("%" PRIu64 " ", sample->time);
 697 }
 698
 699 static void dump_event(struct perf_session *session, union perf_event *event,
 700                        u64 file_offset, struct perf_sample *sample)
 701 {
 702         if (!dump_trace)
 703                 return;
 704
 705         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 706                file_offset, event->header.size, event->header.type);
 707
 708         trace_event(event);
 709
 710         if (sample)
 711                 perf_session__print_tstamp(session, event, sample);
 712
 713         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 714                event->header.size, perf_event__name(event->header.type));
 715 }
 716
 717 static void dump_sample(struct perf_session *session, union perf_event *event,
 718                         struct perf_sample *sample)
 719 {
 720         if (!dump_trace)
 721                 return;
 722
 723         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 724                event->header.misc, sample->pid, sample->tid, sample->ip,
 725                sample->period, sample->addr);
 726
 727         if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
 728                 callchain__printf(sample);
 729 }
 730
 731 static int perf_session_deliver_event(struct perf_session *session,
 732                                       union perf_event *event,
 733                                       struct perf_sample *sample,
 734                                       struct perf_event_ops *ops,
 735                                       u64 file_offset)
 736 {
 737         struct perf_evsel *evsel;
 738
 739         dump_event(session, event, file_offset, sample);
 740
 741         switch (event->header.type) {
 742         case PERF_RECORD_SAMPLE:
 743                 dump_sample(session, event, sample);
 744                 evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 745                 if (evsel == NULL) {
 746                         ++session->hists.stats.nr_unknown_id;
 747                         return -1;
 748                 }
 749                 return ops->sample(event, sample, evsel, session);
 750         case PERF_RECORD_MMAP:
 751                 return ops->mmap(event, sample, session);
 752         case PERF_RECORD_COMM:
 753                 return ops->comm(event, sample, session);
 754         case PERF_RECORD_FORK:
 755                 return ops->fork(event, sample, session);
 756         case PERF_RECORD_EXIT:
 757                 return ops->exit(event, sample, session);
 758         case PERF_RECORD_LOST:
 759                 return ops->lost(event, sample, session);
 760         case PERF_RECORD_READ:
 761                 return ops->read(event, sample, session);
 762         case PERF_RECORD_THROTTLE:
 763                 return ops->throttle(event, sample, session);
 764         case PERF_RECORD_UNTHROTTLE:
 765                 return ops->unthrottle(event, sample, session);
 766         default:
 767                 ++session->hists.stats.nr_unknown_events;
 768                 return -1;
 769         }
 770 }
 771
 772 static int perf_session__preprocess_sample(struct perf_session *session,
 773                                            union perf_event *event, struct perf_sample *sample)
 774 {
 775         if (event->header.type != PERF_RECORD_SAMPLE ||
 776             !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
 777                 return 0;
 778
 779         if (!ip_callchain__valid(sample->callchain, event)) {
 780                 pr_debug("call-chain problem with event, skipping it.\n");
 781                 ++session->hists.stats.nr_invalid_chains;
 782                 session->hists.stats.total_invalid_chains += sample->period;
 783                 return -EINVAL;
 784         }
 785         return 0;
 786 }
 787
 788 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
 789                                             struct perf_event_ops *ops, u64 file_offset)
 790 {
 791         dump_event(session, event, file_offset, NULL);
 792
 793         /* These events are processed right away */
 794         switch (event->header.type) {
 795         case PERF_RECORD_HEADER_ATTR:
 796                 return ops->attr(event, session);
 797         case PERF_RECORD_HEADER_EVENT_TYPE:
 798                 return ops->event_type(event, session);
 799         case PERF_RECORD_HEADER_TRACING_DATA:
 800                 /* setup for reading amidst mmap */
 801                 lseek(session->fd, file_offset, SEEK_SET);
 802                 return ops->tracing_data(event, session);
 803         case PERF_RECORD_HEADER_BUILD_ID:
 804                 return ops->build_id(event, session);
 805         case PERF_RECORD_FINISHED_ROUND:
 806                 return ops->finished_round(event, session, ops);
 807         default:
 808                 return -EINVAL;
 809         }
 810 }
 811
 812 static int perf_session__process_event(struct perf_session *session,
 813                                        union perf_event *event,
 814                                        struct perf_event_ops *ops,
 815                                        u64 file_offset)
 816 {
 817         struct perf_sample sample;
 818         int ret;
 819
 820         if (session->header.needs_swap &&
 821             perf_event__swap_ops[event->header.type])
 822                 perf_event__swap_ops[event->header.type](event);
 823
 824         if (event->header.type >= PERF_RECORD_HEADER_MAX)
 825                 return -EINVAL;
 826
 827         hists__inc_nr_events(&session->hists, event->header.type);
 828
 829         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
 830                 return perf_session__process_user_event(session, event, ops, file_offset);
 831
 832         /*
 833          * For all kernel events we get the sample data
 834          */
 835         ret = perf_session__parse_sample(session, event, &sample);
 836         if (ret)
 837                 return ret;
 838
 839         /* Preprocess sample records - precheck callchains */
 840         if (perf_session__preprocess_sample(session, event, &sample))
 841                 return 0;
 842
 843         if (ops->ordered_samples) {
 844                 ret = perf_session_queue_event(session, event, &sample,
 845                                                file_offset);
 846                 if (ret != -ETIME)
 847                         return ret;
 848         }
 849
 850         return perf_session_deliver_event(session, event, &sample, ops,
 851                                           file_offset);
 852 }
 853
 854 void perf_event_header__bswap(struct perf_event_header *self)
 855 {
 856         self->type = bswap_32(self->type);
 857         self->misc = bswap_16(self->misc);
 858         self->size = bswap_16(self->size);
 859 }
 860
 861 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 862 {
 863         struct thread *thread = perf_session__findnew(self, 0);
 864
 865         if (thread == NULL || thread__set_comm(thread, "swapper")) {
 866                 pr_err("problem inserting idle task.\n");
 867                 thread = NULL;
 868         }
 869
 870         return thread;
 871 }
 872
 873 static void perf_session__warn_about_errors(const struct perf_session *session,
 874                                             const struct perf_event_ops *ops)
 875 {
 876         if (ops->lost == perf_event__process_lost &&
 877             session->hists.stats.total_lost != 0) {
 878                 ui__warning("Processed %" PRIu64 " events and LOST %" PRIu64
 879                             "!\n\nCheck IO/CPU overload!\n\n",
 880                             session->hists.stats.total_period,
 881                             session->hists.stats.total_lost);
 882         }
 883
 884         if (session->hists.stats.nr_unknown_events != 0) {
 885                 ui__warning("Found %u unknown events!\n\n"
 886                             "Is this an older tool processing a perf.data "
 887                             "file generated by a more recent tool?\n\n"
 888                             "If that is not the case, consider "
 889                             "reporting to linux-kernel@vger.kernel.org.\n\n",
 890                             session->hists.stats.nr_unknown_events);
 891         }
 892
 893         if (session->hists.stats.nr_unknown_id != 0) {
 894                 ui__warning("%u samples with id not present in the header\n",
 895                             session->hists.stats.nr_unknown_id);
 896         }
 897
 898         if (session->hists.stats.nr_invalid_chains != 0) {
 899                 ui__warning("Found invalid callchains!\n\n"
 900                             "%u out of %u events were discarded for this reason.\n\n"
 901                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
 902                             session->hists.stats.nr_invalid_chains,
 903                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
 904         }
 905 }
 906
 907 #define session_done()  (*(volatile int *)(&session_done))
 908 volatile int session_done;
 909
 910 static int __perf_session__process_pipe_events(struct perf_session *self,
 911                                                struct perf_event_ops *ops)
 912 {
 913         union perf_event event;
 914         uint32_t size;
 915         int skip = 0;
 916         u64 head;
 917         int err;
 918         void *p;
 919
 920         perf_event_ops__fill_defaults(ops);
 921
 922         head = 0;
 923 more:
 924         err = readn(self->fd, &event, sizeof(struct perf_event_header));
 925         if (err <= 0) {
 926                 if (err == 0)
 927                         goto done;
 928
 929                 pr_err("failed to read event header\n");
 930                 goto out_err;
 931         }
 932
 933         if (self->header.needs_swap)
 934                 perf_event_header__bswap(&event.header);
 935
 936         size = event.header.size;
 937         if (size == 0)
 938                 size = 8;
 939
 940         p = &event;
 941         p += sizeof(struct perf_event_header);
 942
 943         if (size - sizeof(struct perf_event_header)) {
 944                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
 945                 if (err <= 0) {
 946                         if (err == 0) {
 947                                 pr_err("unexpected end of event stream\n");
 948                                 goto done;
 949                         }
 950
 951                         pr_err("failed to read event data\n");
 952                         goto out_err;
 953                 }
 954         }
 955
 956         if (size == 0 ||
 957             (skip = perf_session__process_event(self, &event, ops, head)) < 0) {
 958                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
 959                             head, event.header.size, event.header.type);
 960                 /*
 961                  * assume we lost track of the stream, check alignment, and
 962                  * increment a single u64 in the hope to catch on again 'soon'.
 963                  */
 964                 if (unlikely(head & 7))
 965                         head &= ~7ULL;
 966
 967                 size = 8;
 968         }
 969
 970         head += size;
 971
 972         if (skip > 0)
 973                 head += skip;
 974
 975         if (!session_done())
 976                 goto more;
 977 done:
 978         err = 0;
 979 out_err:
 980         perf_session__warn_about_errors(self, ops);
 981         perf_session_free_sample_buffers(self);
 982         return err;
 983 }
 984
 985 static union perf_event *
 986 fetch_mmaped_event(struct perf_session *session,
 987                    u64 head, size_t mmap_size, char *buf)
 988 {
 989         union perf_event *event;
 990
 991         /*
 992          * Ensure we have enough space remaining to read
 993          * the size of the event in the headers.
 994          */
 995         if (head + sizeof(event->header) > mmap_size)
 996                 return NULL;
 997
 998         event = (union perf_event *)(buf + head);
 999
1000         if (session->header.needs_swap)
1001                 perf_event_header__bswap(&event->header);
1002
1003         if (head + event->header.size > mmap_size)
1004                 return NULL;
1005
1006         return event;
1007 }
1008
1009 int __perf_session__process_events(struct perf_session *session,
1010                                    u64 data_offset, u64 data_size,
1011                                    u64 file_size, struct perf_event_ops *ops)
1012 {
1013         u64 head, page_offset, file_offset, file_pos, progress_next;
1014         int err, mmap_prot, mmap_flags, map_idx = 0;
1015         struct ui_progress *progress;
1016         size_t  page_size, mmap_size;
1017         char *buf, *mmaps[8];
1018         union perf_event *event;
1019         uint32_t size;
1020
1021         perf_event_ops__fill_defaults(ops);
1022
1023         page_size = sysconf(_SC_PAGESIZE);
1024
1025         page_offset = page_size * (data_offset / page_size);
1026         file_offset = page_offset;
1027         head = data_offset - page_offset;
1028
1029         if (data_offset + data_size < file_size)
1030                 file_size = data_offset + data_size;
1031
1032         progress_next = file_size / 16;
1033         progress = ui_progress__new("Processing events...", file_size);
1034         if (progress == NULL)
1035                 return -1;
1036
1037         mmap_size = session->mmap_window;
1038         if (mmap_size > file_size)
1039                 mmap_size = file_size;
1040
1041         memset(mmaps, 0, sizeof(mmaps));
1042
1043         mmap_prot  = PROT_READ;
1044         mmap_flags = MAP_SHARED;
1045
1046         if (session->header.needs_swap) {
1047                 mmap_prot  |= PROT_WRITE;
1048                 mmap_flags = MAP_PRIVATE;
1049         }
1050 remap:
1051         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1052                    file_offset);
1053         if (buf == MAP_FAILED) {
1054                 pr_err("failed to mmap file\n");
1055                 err = -errno;
1056                 goto out_err;
1057         }
1058         mmaps[map_idx] = buf;
1059         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1060         file_pos = file_offset + head;
1061
1062 more:
1063         event = fetch_mmaped_event(session, head, mmap_size, buf);
1064         if (!event) {
1065                 if (mmaps[map_idx]) {
1066                         munmap(mmaps[map_idx], mmap_size);
1067                         mmaps[map_idx] = NULL;
1068                 }
1069
1070                 page_offset = page_size * (head / page_size);
1071                 file_offset += page_offset;
1072                 head -= page_offset;
1073                 goto remap;
1074         }
1075
1076         size = event->header.size;
1077
1078         if (size == 0 ||
1079             perf_session__process_event(session, event, ops, file_pos) < 0) {
1080                 dump_printf("%#" PRIx64 " [%#x]: skipping unknown header type: %d\n",
1081                             file_offset + head, event->header.size,
1082                             event->header.type);
1083                 /*
1084                  * assume we lost track of the stream, check alignment, and
1085                  * increment a single u64 in the hope to catch on again 'soon'.
1086                  */
1087                 if (unlikely(head & 7))
1088                         head &= ~7ULL;
1089
1090                 size = 8;
1091         }
1092
1093         head += size;
1094         file_pos += size;
1095
1096         if (file_pos >= progress_next) {
1097                 progress_next += file_size / 16;
1098                 ui_progress__update(progress, file_pos);
1099         }
1100
1101         if (file_pos < file_size)
1102                 goto more;
1103
1104         err = 0;
1105         /* do the final flush for ordered samples */
1106         session->ordered_samples.next_flush = ULLONG_MAX;
1107         flush_sample_queue(session, ops);
1108 out_err:
1109         ui_progress__delete(progress);
1110         perf_session__warn_about_errors(session, ops);
1111         perf_session_free_sample_buffers(session);
1112         return err;
1113 }
1114
1115 int perf_session__process_events(struct perf_session *self,
1116                                  struct perf_event_ops *ops)
1117 {
1118         int err;
1119
1120         if (perf_session__register_idle_thread(self) == NULL)
1121                 return -ENOMEM;
1122
1123         if (!self->fd_pipe)
1124                 err = __perf_session__process_events(self,
1125                                                      self->header.data_offset,
1126                                                      self->header.data_size,
1127                                                      self->size, ops);
1128         else
1129                 err = __perf_session__process_pipe_events(self, ops);
1130
1131         return err;
1132 }
1133
1134 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1135 {
1136         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1137                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1138                 return false;
1139         }
1140
1141         return true;
1142 }
1143
1144 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
1145                                              const char *symbol_name,
1146                                              u64 addr)
1147 {
1148         char *bracket;
1149         enum map_type i;
1150         struct ref_reloc_sym *ref;
1151
1152         ref = zalloc(sizeof(struct ref_reloc_sym));
1153         if (ref == NULL)
1154                 return -ENOMEM;
1155
1156         ref->name = strdup(symbol_name);
1157         if (ref->name == NULL) {
1158                 free(ref);
1159                 return -ENOMEM;
1160         }
1161
1162         bracket = strchr(ref->name, ']');
1163         if (bracket)
1164                 *bracket = '\0';
1165
1166         ref->addr = addr;
1167
1168         for (i = 0; i < MAP__NR_TYPES; ++i) {
1169                 struct kmap *kmap = map__kmap(maps[i]);
1170                 kmap->ref_reloc_sym = ref;
1171         }
1172
1173         return 0;
1174 }
1175
1176 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1177 {
1178         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1179                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1180                machines__fprintf_dsos(&self->machines, fp);
1181 }
1182
1183 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1184                                           bool with_hits)
1185 {
1186         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1187         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1188 }
1189
1190 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1191 {
1192         struct perf_evsel *pos;
1193         size_t ret = fprintf(fp, "Aggregated stats:\n");
1194
1195         ret += hists__fprintf_nr_events(&session->hists, fp);
1196
1197         list_for_each_entry(pos, &session->evlist->entries, node) {
1198                 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1199                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1200         }
1201
1202         return ret;
1203 }
1204
1205 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1206                                               unsigned int type)
1207 {
1208         struct perf_evsel *pos;
1209
1210         list_for_each_entry(pos, &session->evlist->entries, node) {
1211                 if (pos->attr.type == type)
1212                         return pos;
1213         }
1214         return NULL;
1215 }
1216
1217 void perf_session__print_ip(union perf_event *event,
1218                             struct perf_sample *sample,
1219                             struct perf_session *session,
1220                             int print_sym, int print_dso)
1221 {
1222         struct addr_location al;
1223         const char *symname, *dsoname;
1224         struct callchain_cursor *cursor = &session->callchain_cursor;
1225         struct callchain_cursor_node *node;
1226
1227         if (perf_event__preprocess_sample(event, session, &al, sample,
1228                                           NULL) < 0) {
1229                 error("problem processing %d event, skipping it.\n",
1230                         event->header.type);
1231                 return;
1232         }
1233
1234         if (symbol_conf.use_callchain && sample->callchain) {
1235
1236                 if (perf_session__resolve_callchain(session, al.thread,
1237                                                 sample->callchain, NULL) != 0) {
1238                         if (verbose)
1239                                 error("Failed to resolve callchain. Skipping\n");
1240                         return;
1241                 }
1242                 callchain_cursor_commit(cursor);
1243
1244                 while (1) {
1245                         node = callchain_cursor_current(cursor);
1246                         if (!node)
1247                                 break;
1248
1249                         printf("\t%16" PRIx64, node->ip);
1250                         if (print_sym) {
1251                                 if (node->sym && node->sym->name)
1252                                         symname = node->sym->name;
1253                                 else
1254                                         symname = "";
1255
1256                                 printf(" %s", symname);
1257                         }
1258                         if (print_dso) {
1259                                 if (node->map && node->map->dso && node->map->dso->name)
1260                                         dsoname = node->map->dso->name;
1261                                 else
1262                                         dsoname = "";
1263
1264                                 printf(" (%s)", dsoname);
1265                         }
1266                         printf("\n");
1267
1268                         callchain_cursor_advance(cursor);
1269                 }
1270
1271         } else {
1272                 printf("%16" PRIx64, sample->ip);
1273                 if (print_sym) {
1274                         if (al.sym && al.sym->name)
1275                                 symname = al.sym->name;
1276                         else
1277                                 symname = "";
1278
1279                         printf(" %s", symname);
1280                 }
1281
1282                 if (print_dso) {
1283                         if (al.map && al.map->dso && al.map->dso->name)
1284                                 dsoname = al.map->dso->name;
1285                         else
1286                                 dsoname = "";
1287
1288                         printf(" (%s)", dsoname);
1289                 }
1290         }
1291 }
1292
1293 int perf_session__cpu_bitmap(struct perf_session *session,
1294                              const char *cpu_list, unsigned long *cpu_bitmap)
1295 {
1296         int i;
1297         struct cpu_map *map;
1298
1299         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1300                 struct perf_evsel *evsel;
1301
1302                 evsel = perf_session__find_first_evtype(session, i);
1303                 if (!evsel)
1304                         continue;
1305
1306                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1307                         pr_err("File does not contain CPU events. "
1308                                "Remove -c option to proceed.\n");
1309                         return -1;
1310                 }
1311         }
1312
1313         map = cpu_map__new(cpu_list);
1314
1315         for (i = 0; i < map->nr; i++) {
1316                 int cpu = map->map[i];
1317
1318                 if (cpu >= MAX_NR_CPUS) {
1319                         pr_err("Requested CPU %d too large. "
1320                                "Consider raising MAX_NR_CPUS\n", cpu);
1321                         return -1;
1322                 }
1323
1324                 set_bit(cpu, cpu_bitmap);
1325         }
1326
1327         return 0;
1328 }
1329
1330 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1331                                 bool full)
1332 {
1333         struct stat st;
1334         int ret;
1335
1336         if (session == NULL || fp == NULL)
1337                 return;
1338
1339         ret = fstat(session->fd, &st);
1340         if (ret == -1)
1341                 return;
1342
1343         fprintf(fp, "# ========\n");
1344         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1345         perf_header__fprintf_info(session, fp, full);
1346         fprintf(fp, "# ========\n#\n");
1347 }