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
   9 #include "session.h"
  10 #include "sort.h"
  11 #include "util.h"
  12
  13 static int perf_session__open(struct perf_session *self, bool force)
  14 {
  15         struct stat input_stat;
  16
  17         if (!strcmp(self->filename, "-")) {
  18                 self->fd_pipe = true;
  19                 self->fd = STDIN_FILENO;
  20
  21                 if (perf_header__read(self, self->fd) < 0)
  22                         pr_err("incompatible file format");
  23
  24                 return 0;
  25         }
  26
  27         self->fd = open(self->filename, O_RDONLY);
  28         if (self->fd < 0) {
  29                 pr_err("failed to open file: %s", self->filename);
  30                 if (!strcmp(self->filename, "perf.data"))
  31                         pr_err("  (try 'perf record' first)");
  32                 pr_err("\n");
  33                 return -errno;
  34         }
  35
  36         if (fstat(self->fd, &input_stat) < 0)
  37                 goto out_close;
  38
  39         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  40                 pr_err("file %s not owned by current user or root\n",
  41                        self->filename);
  42                 goto out_close;
  43         }
  44
  45         if (!input_stat.st_size) {
  46                 pr_info("zero-sized file (%s), nothing to do!\n",
  47                         self->filename);
  48                 goto out_close;
  49         }
  50
  51         if (perf_header__read(self, self->fd) < 0) {
  52                 pr_err("incompatible file format");
  53                 goto out_close;
  54         }
  55
  56         self->size = input_stat.st_size;
  57         return 0;
  58
  59 out_close:
  60         close(self->fd);
  61         self->fd = -1;
  62         return -1;
  63 }
  64
  65 void perf_session__update_sample_type(struct perf_session *self)
  66 {
  67         self->sample_type = perf_header__sample_type(&self->header);
  68 }
  69
  70 int perf_session__create_kernel_maps(struct perf_session *self)
  71 {
  72         int ret = machine__create_kernel_maps(&self->host_machine);
  73
  74         if (ret >= 0)
  75                 ret = machines__create_guest_kernel_maps(&self->machines);
  76         return ret;
  77 }
  78
  79 struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
  80 {
  81         size_t len = filename ? strlen(filename) + 1 : 0;
  82         struct perf_session *self = zalloc(sizeof(*self) + len);
  83
  84         if (self == NULL)
  85                 goto out;
  86
  87         if (perf_header__init(&self->header) < 0)
  88                 goto out_free;
  89
  90         memcpy(self->filename, filename, len);
  91         self->threads = RB_ROOT;
  92         self->hists_tree = RB_ROOT;
  93         self->last_match = NULL;
  94         self->mmap_window = 32;
  95         self->cwd = NULL;
  96         self->cwdlen = 0;
  97         self->machines = RB_ROOT;
  98         self->repipe = repipe;
  99         INIT_LIST_HEAD(&self->ordered_samples.samples_head);
 100         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 101
 102         if (mode == O_RDONLY) {
 103                 if (perf_session__open(self, force) < 0)
 104                         goto out_delete;
 105         } else if (mode == O_WRONLY) {
 106                 /*
 107                  * In O_RDONLY mode this will be performed when reading the
 108                  * kernel MMAP event, in event__process_mmap().
 109                  */
 110                 if (perf_session__create_kernel_maps(self) < 0)
 111                         goto out_delete;
 112         }
 113
 114         perf_session__update_sample_type(self);
 115 out:
 116         return self;
 117 out_free:
 118         free(self);
 119         return NULL;
 120 out_delete:
 121         perf_session__delete(self);
 122         return NULL;
 123 }
 124
 125 void perf_session__delete(struct perf_session *self)
 126 {
 127         perf_header__exit(&self->header);
 128         close(self->fd);
 129         free(self->cwd);
 130         free(self);
 131 }
 132
 133 static bool symbol__match_parent_regex(struct symbol *sym)
 134 {
 135         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 136                 return 1;
 137
 138         return 0;
 139 }
 140
 141 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self,
 142                                                    struct thread *thread,
 143                                                    struct ip_callchain *chain,
 144                                                    struct symbol **parent)
 145 {
 146         u8 cpumode = PERF_RECORD_MISC_USER;
 147         unsigned int i;
 148         struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));
 149
 150         if (!syms)
 151                 return NULL;
 152
 153         for (i = 0; i < chain->nr; i++) {
 154                 u64 ip = chain->ips[i];
 155                 struct addr_location al;
 156
 157                 if (ip >= PERF_CONTEXT_MAX) {
 158                         switch (ip) {
 159                         case PERF_CONTEXT_HV:
 160                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 161                         case PERF_CONTEXT_KERNEL:
 162                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 163                         case PERF_CONTEXT_USER:
 164                                 cpumode = PERF_RECORD_MISC_USER;        break;
 165                         default:
 166                                 break;
 167                         }
 168                         continue;
 169                 }
 170
 171                 al.filtered = false;
 172                 thread__find_addr_location(thread, self, cpumode,
 173                                 MAP__FUNCTION, thread->pid, ip, &al, NULL);
 174                 if (al.sym != NULL) {
 175                         if (sort__has_parent && !*parent &&
 176                             symbol__match_parent_regex(al.sym))
 177                                 *parent = al.sym;
 178                         if (!symbol_conf.use_callchain)
 179                                 break;
 180                         syms[i].map = al.map;
 181                         syms[i].sym = al.sym;
 182                 }
 183         }
 184
 185         return syms;
 186 }
 187
 188 static int process_event_stub(event_t *event __used,
 189                               struct perf_session *session __used)
 190 {
 191         dump_printf(": unhandled!\n");
 192         return 0;
 193 }
 194
 195 static int process_finished_round_stub(event_t *event __used,
 196                                        struct perf_session *session __used,
 197                                        struct perf_event_ops *ops __used)
 198 {
 199         dump_printf(": unhandled!\n");
 200         return 0;
 201 }
 202
 203 static int process_finished_round(event_t *event,
 204                                   struct perf_session *session,
 205                                   struct perf_event_ops *ops);
 206
 207 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
 208 {
 209         if (handler->sample == NULL)
 210                 handler->sample = process_event_stub;
 211         if (handler->mmap == NULL)
 212                 handler->mmap = process_event_stub;
 213         if (handler->comm == NULL)
 214                 handler->comm = process_event_stub;
 215         if (handler->fork == NULL)
 216                 handler->fork = process_event_stub;
 217         if (handler->exit == NULL)
 218                 handler->exit = process_event_stub;
 219         if (handler->lost == NULL)
 220                 handler->lost = process_event_stub;
 221         if (handler->read == NULL)
 222                 handler->read = process_event_stub;
 223         if (handler->throttle == NULL)
 224                 handler->throttle = process_event_stub;
 225         if (handler->unthrottle == NULL)
 226                 handler->unthrottle = process_event_stub;
 227         if (handler->attr == NULL)
 228                 handler->attr = process_event_stub;
 229         if (handler->event_type == NULL)
 230                 handler->event_type = process_event_stub;
 231         if (handler->tracing_data == NULL)
 232                 handler->tracing_data = process_event_stub;
 233         if (handler->build_id == NULL)
 234                 handler->build_id = process_event_stub;
 235         if (handler->finished_round == NULL) {
 236                 if (handler->ordered_samples)
 237                         handler->finished_round = process_finished_round;
 238                 else
 239                         handler->finished_round = process_finished_round_stub;
 240         }
 241 }
 242
 243 void mem_bswap_64(void *src, int byte_size)
 244 {
 245         u64 *m = src;
 246
 247         while (byte_size > 0) {
 248                 *m = bswap_64(*m);
 249                 byte_size -= sizeof(u64);
 250                 ++m;
 251         }
 252 }
 253
 254 static void event__all64_swap(event_t *self)
 255 {
 256         struct perf_event_header *hdr = &self->header;
 257         mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
 258 }
 259
 260 static void event__comm_swap(event_t *self)
 261 {
 262         self->comm.pid = bswap_32(self->comm.pid);
 263         self->comm.tid = bswap_32(self->comm.tid);
 264 }
 265
 266 static void event__mmap_swap(event_t *self)
 267 {
 268         self->mmap.pid   = bswap_32(self->mmap.pid);
 269         self->mmap.tid   = bswap_32(self->mmap.tid);
 270         self->mmap.start = bswap_64(self->mmap.start);
 271         self->mmap.len   = bswap_64(self->mmap.len);
 272         self->mmap.pgoff = bswap_64(self->mmap.pgoff);
 273 }
 274
 275 static void event__task_swap(event_t *self)
 276 {
 277         self->fork.pid  = bswap_32(self->fork.pid);
 278         self->fork.tid  = bswap_32(self->fork.tid);
 279         self->fork.ppid = bswap_32(self->fork.ppid);
 280         self->fork.ptid = bswap_32(self->fork.ptid);
 281         self->fork.time = bswap_64(self->fork.time);
 282 }
 283
 284 static void event__read_swap(event_t *self)
 285 {
 286         self->read.pid          = bswap_32(self->read.pid);
 287         self->read.tid          = bswap_32(self->read.tid);
 288         self->read.value        = bswap_64(self->read.value);
 289         self->read.time_enabled = bswap_64(self->read.time_enabled);
 290         self->read.time_running = bswap_64(self->read.time_running);
 291         self->read.id           = bswap_64(self->read.id);
 292 }
 293
 294 static void event__attr_swap(event_t *self)
 295 {
 296         size_t size;
 297
 298         self->attr.attr.type            = bswap_32(self->attr.attr.type);
 299         self->attr.attr.size            = bswap_32(self->attr.attr.size);
 300         self->attr.attr.config          = bswap_64(self->attr.attr.config);
 301         self->attr.attr.sample_period   = bswap_64(self->attr.attr.sample_period);
 302         self->attr.attr.sample_type     = bswap_64(self->attr.attr.sample_type);
 303         self->attr.attr.read_format     = bswap_64(self->attr.attr.read_format);
 304         self->attr.attr.wakeup_events   = bswap_32(self->attr.attr.wakeup_events);
 305         self->attr.attr.bp_type         = bswap_32(self->attr.attr.bp_type);
 306         self->attr.attr.bp_addr         = bswap_64(self->attr.attr.bp_addr);
 307         self->attr.attr.bp_len          = bswap_64(self->attr.attr.bp_len);
 308
 309         size = self->header.size;
 310         size -= (void *)&self->attr.id - (void *)self;
 311         mem_bswap_64(self->attr.id, size);
 312 }
 313
 314 static void event__event_type_swap(event_t *self)
 315 {
 316         self->event_type.event_type.event_id =
 317                 bswap_64(self->event_type.event_type.event_id);
 318 }
 319
 320 static void event__tracing_data_swap(event_t *self)
 321 {
 322         self->tracing_data.size = bswap_32(self->tracing_data.size);
 323 }
 324
 325 typedef void (*event__swap_op)(event_t *self);
 326
 327 static event__swap_op event__swap_ops[] = {
 328         [PERF_RECORD_MMAP]   = event__mmap_swap,
 329         [PERF_RECORD_COMM]   = event__comm_swap,
 330         [PERF_RECORD_FORK]   = event__task_swap,
 331         [PERF_RECORD_EXIT]   = event__task_swap,
 332         [PERF_RECORD_LOST]   = event__all64_swap,
 333         [PERF_RECORD_READ]   = event__read_swap,
 334         [PERF_RECORD_SAMPLE] = event__all64_swap,
 335         [PERF_RECORD_HEADER_ATTR]   = event__attr_swap,
 336         [PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
 337         [PERF_RECORD_HEADER_TRACING_DATA]   = event__tracing_data_swap,
 338         [PERF_RECORD_HEADER_BUILD_ID]   = NULL,
 339         [PERF_RECORD_HEADER_MAX]    = NULL,
 340 };
 341
 342 struct sample_queue {
 343         u64                     timestamp;
 344         struct sample_event     *event;
 345         struct list_head        list;
 346 };
 347
 348 static void flush_sample_queue(struct perf_session *s,
 349                                struct perf_event_ops *ops)
 350 {
 351         struct list_head *head = &s->ordered_samples.samples_head;
 352         u64 limit = s->ordered_samples.next_flush;
 353         struct sample_queue *tmp, *iter;
 354
 355         if (!ops->ordered_samples || !limit)
 356                 return;
 357
 358         list_for_each_entry_safe(iter, tmp, head, list) {
 359                 if (iter->timestamp > limit)
 360                         return;
 361
 362                 if (iter == s->ordered_samples.last_inserted)
 363                         s->ordered_samples.last_inserted = NULL;
 364
 365                 ops->sample((event_t *)iter->event, s);
 366
 367                 s->ordered_samples.last_flush = iter->timestamp;
 368                 list_del(&iter->list);
 369                 free(iter->event);
 370                 free(iter);
 371         }
 372 }
 373
 374 /*
 375  * When perf record finishes a pass on every buffers, it records this pseudo
 376  * event.
 377  * We record the max timestamp t found in the pass n.
 378  * Assuming these timestamps are monotonic across cpus, we know that if
 379  * a buffer still has events with timestamps below t, they will be all
 380  * available and then read in the pass n + 1.
 381  * Hence when we start to read the pass n + 2, we can safely flush every
 382  * events with timestamps below t.
 383  *
 384  *    ============ PASS n =================
 385  *       CPU 0         |   CPU 1
 386  *                     |
 387  *    cnt1 timestamps  |   cnt2 timestamps
 388  *          1          |         2
 389  *          2          |         3
 390  *          -          |         4  <--- max recorded
 391  *
 392  *    ============ PASS n + 1 ==============
 393  *       CPU 0         |   CPU 1
 394  *                     |
 395  *    cnt1 timestamps  |   cnt2 timestamps
 396  *          3          |         5
 397  *          4          |         6
 398  *          5          |         7 <---- max recorded
 399  *
 400  *      Flush every events below timestamp 4
 401  *
 402  *    ============ PASS n + 2 ==============
 403  *       CPU 0         |   CPU 1
 404  *                     |
 405  *    cnt1 timestamps  |   cnt2 timestamps
 406  *          6          |         8
 407  *          7          |         9
 408  *          -          |         10
 409  *
 410  *      Flush every events below timestamp 7
 411  *      etc...
 412  */
 413 static int process_finished_round(event_t *event __used,
 414                                   struct perf_session *session,
 415                                   struct perf_event_ops *ops)
 416 {
 417         flush_sample_queue(session, ops);
 418         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 419
 420         return 0;
 421 }
 422
 423 static void __queue_sample_end(struct sample_queue *new, struct list_head *head)
 424 {
 425         struct sample_queue *iter;
 426
 427         list_for_each_entry_reverse(iter, head, list) {
 428                 if (iter->timestamp < new->timestamp) {
 429                         list_add(&new->list, &iter->list);
 430                         return;
 431                 }
 432         }
 433
 434         list_add(&new->list, head);
 435 }
 436
 437 static void __queue_sample_before(struct sample_queue *new,
 438                                   struct sample_queue *iter,
 439                                   struct list_head *head)
 440 {
 441         list_for_each_entry_continue_reverse(iter, head, list) {
 442                 if (iter->timestamp < new->timestamp) {
 443                         list_add(&new->list, &iter->list);
 444                         return;
 445                 }
 446         }
 447
 448         list_add(&new->list, head);
 449 }
 450
 451 static void __queue_sample_after(struct sample_queue *new,
 452                                  struct sample_queue *iter,
 453                                  struct list_head *head)
 454 {
 455         list_for_each_entry_continue(iter, head, list) {
 456                 if (iter->timestamp > new->timestamp) {
 457                         list_add_tail(&new->list, &iter->list);
 458                         return;
 459                 }
 460         }
 461         list_add_tail(&new->list, head);
 462 }
 463
 464 /* The queue is ordered by time */
 465 static void __queue_sample_event(struct sample_queue *new,
 466                                  struct perf_session *s)
 467 {
 468         struct sample_queue *last_inserted = s->ordered_samples.last_inserted;
 469         struct list_head *head = &s->ordered_samples.samples_head;
 470
 471
 472         if (!last_inserted) {
 473                 __queue_sample_end(new, head);
 474                 return;
 475         }
 476
 477         /*
 478          * Most of the time the current event has a timestamp
 479          * very close to the last event inserted, unless we just switched
 480          * to another event buffer. Having a sorting based on a list and
 481          * on the last inserted event that is close to the current one is
 482          * probably more efficient than an rbtree based sorting.
 483          */
 484         if (last_inserted->timestamp >= new->timestamp)
 485                 __queue_sample_before(new, last_inserted, head);
 486         else
 487                 __queue_sample_after(new, last_inserted, head);
 488 }
 489
 490 static int queue_sample_event(event_t *event, struct sample_data *data,
 491                               struct perf_session *s)
 492 {
 493         u64 timestamp = data->time;
 494         struct sample_queue *new;
 495
 496
 497         if (timestamp < s->ordered_samples.last_flush) {
 498                 printf("Warning: Timestamp below last timeslice flush\n");
 499                 return -EINVAL;
 500         }
 501
 502         new = malloc(sizeof(*new));
 503         if (!new)
 504                 return -ENOMEM;
 505
 506         new->timestamp = timestamp;
 507
 508         new->event = malloc(event->header.size);
 509         if (!new->event) {
 510                 free(new);
 511                 return -ENOMEM;
 512         }
 513
 514         memcpy(new->event, event, event->header.size);
 515
 516         __queue_sample_event(new, s);
 517         s->ordered_samples.last_inserted = new;
 518
 519         if (new->timestamp > s->ordered_samples.max_timestamp)
 520                 s->ordered_samples.max_timestamp = new->timestamp;
 521
 522         return 0;
 523 }
 524
 525 static int perf_session__process_sample(event_t *event, struct perf_session *s,
 526                                         struct perf_event_ops *ops)
 527 {
 528         struct sample_data data;
 529
 530         if (!ops->ordered_samples)
 531                 return ops->sample(event, s);
 532
 533         bzero(&data, sizeof(struct sample_data));
 534         event__parse_sample(event, s->sample_type, &data);
 535
 536         queue_sample_event(event, &data, s);
 537
 538         return 0;
 539 }
 540
 541 static int perf_session__process_event(struct perf_session *self,
 542                                        event_t *event,
 543                                        struct perf_event_ops *ops,
 544                                        u64 offset, u64 head)
 545 {
 546         trace_event(event);
 547
 548         if (event->header.type < PERF_RECORD_HEADER_MAX) {
 549                 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
 550                             offset + head, event->header.size,
 551                             event__name[event->header.type]);
 552                 hists__inc_nr_events(self, event->header.type);
 553         }
 554
 555         if (self->header.needs_swap && event__swap_ops[event->header.type])
 556                 event__swap_ops[event->header.type](event);
 557
 558         switch (event->header.type) {
 559         case PERF_RECORD_SAMPLE:
 560                 return perf_session__process_sample(event, self, ops);
 561         case PERF_RECORD_MMAP:
 562                 return ops->mmap(event, self);
 563         case PERF_RECORD_COMM:
 564                 return ops->comm(event, self);
 565         case PERF_RECORD_FORK:
 566                 return ops->fork(event, self);
 567         case PERF_RECORD_EXIT:
 568                 return ops->exit(event, self);
 569         case PERF_RECORD_LOST:
 570                 return ops->lost(event, self);
 571         case PERF_RECORD_READ:
 572                 return ops->read(event, self);
 573         case PERF_RECORD_THROTTLE:
 574                 return ops->throttle(event, self);
 575         case PERF_RECORD_UNTHROTTLE:
 576                 return ops->unthrottle(event, self);
 577         case PERF_RECORD_HEADER_ATTR:
 578                 return ops->attr(event, self);
 579         case PERF_RECORD_HEADER_EVENT_TYPE:
 580                 return ops->event_type(event, self);
 581         case PERF_RECORD_HEADER_TRACING_DATA:
 582                 /* setup for reading amidst mmap */
 583                 lseek(self->fd, offset + head, SEEK_SET);
 584                 return ops->tracing_data(event, self);
 585         case PERF_RECORD_HEADER_BUILD_ID:
 586                 return ops->build_id(event, self);
 587         case PERF_RECORD_FINISHED_ROUND:
 588                 return ops->finished_round(event, self, ops);
 589         default:
 590                 ++self->hists.stats.nr_unknown_events;
 591                 return -1;
 592         }
 593 }
 594
 595 void perf_event_header__bswap(struct perf_event_header *self)
 596 {
 597         self->type = bswap_32(self->type);
 598         self->misc = bswap_16(self->misc);
 599         self->size = bswap_16(self->size);
 600 }
 601
 602 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 603 {
 604         struct thread *thread = perf_session__findnew(self, 0);
 605
 606         if (thread == NULL || thread__set_comm(thread, "swapper")) {
 607                 pr_err("problem inserting idle task.\n");
 608                 thread = NULL;
 609         }
 610
 611         return thread;
 612 }
 613
 614 int do_read(int fd, void *buf, size_t size)
 615 {
 616         void *buf_start = buf;
 617
 618         while (size) {
 619                 int ret = read(fd, buf, size);
 620
 621                 if (ret <= 0)
 622                         return ret;
 623
 624                 size -= ret;
 625                 buf += ret;
 626         }
 627
 628         return buf - buf_start;
 629 }
 630
 631 #define session_done()  (*(volatile int *)(&session_done))
 632 volatile int session_done;
 633
 634 static int __perf_session__process_pipe_events(struct perf_session *self,
 635                                                struct perf_event_ops *ops)
 636 {
 637         event_t event;
 638         uint32_t size;
 639         int skip = 0;
 640         u64 head;
 641         int err;
 642         void *p;
 643
 644         perf_event_ops__fill_defaults(ops);
 645
 646         head = 0;
 647 more:
 648         err = do_read(self->fd, &event, sizeof(struct perf_event_header));
 649         if (err <= 0) {
 650                 if (err == 0)
 651                         goto done;
 652
 653                 pr_err("failed to read event header\n");
 654                 goto out_err;
 655         }
 656
 657         if (self->header.needs_swap)
 658                 perf_event_header__bswap(&event.header);
 659
 660         size = event.header.size;
 661         if (size == 0)
 662                 size = 8;
 663
 664         p = &event;
 665         p += sizeof(struct perf_event_header);
 666
 667         if (size - sizeof(struct perf_event_header)) {
 668                 err = do_read(self->fd, p,
 669                               size - sizeof(struct perf_event_header));
 670                 if (err <= 0) {
 671                         if (err == 0) {
 672                                 pr_err("unexpected end of event stream\n");
 673                                 goto done;
 674                         }
 675
 676                         pr_err("failed to read event data\n");
 677                         goto out_err;
 678                 }
 679         }
 680
 681         if (size == 0 ||
 682             (skip = perf_session__process_event(self, &event, ops,
 683                                                 0, head)) < 0) {
 684                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 685                             head, event.header.size, event.header.type);
 686                 /*
 687                  * assume we lost track of the stream, check alignment, and
 688                  * increment a single u64 in the hope to catch on again 'soon'.
 689                  */
 690                 if (unlikely(head & 7))
 691                         head &= ~7ULL;
 692
 693                 size = 8;
 694         }
 695
 696         head += size;
 697
 698         dump_printf("\n%#Lx [%#x]: event: %d\n",
 699                     head, event.header.size, event.header.type);
 700
 701         if (skip > 0)
 702                 head += skip;
 703
 704         if (!session_done())
 705                 goto more;
 706 done:
 707         err = 0;
 708 out_err:
 709         return err;
 710 }
 711
 712 int __perf_session__process_events(struct perf_session *self,
 713                                    u64 data_offset, u64 data_size,
 714                                    u64 file_size, struct perf_event_ops *ops)
 715 {
 716         int err, mmap_prot, mmap_flags;
 717         u64 head, shift;
 718         u64 offset = 0;
 719         size_t  page_size;
 720         event_t *event;
 721         uint32_t size;
 722         char *buf;
 723         struct ui_progress *progress = ui_progress__new("Processing events...",
 724                                                         self->size);
 725         if (progress == NULL)
 726                 return -1;
 727
 728         perf_event_ops__fill_defaults(ops);
 729
 730         page_size = sysconf(_SC_PAGESIZE);
 731
 732         head = data_offset;
 733         shift = page_size * (head / page_size);
 734         offset += shift;
 735         head -= shift;
 736
 737         mmap_prot  = PROT_READ;
 738         mmap_flags = MAP_SHARED;
 739
 740         if (self->header.needs_swap) {
 741                 mmap_prot  |= PROT_WRITE;
 742                 mmap_flags = MAP_PRIVATE;
 743         }
 744 remap:
 745         buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
 746                    mmap_flags, self->fd, offset);
 747         if (buf == MAP_FAILED) {
 748                 pr_err("failed to mmap file\n");
 749                 err = -errno;
 750                 goto out_err;
 751         }
 752
 753 more:
 754         event = (event_t *)(buf + head);
 755         ui_progress__update(progress, offset);
 756
 757         if (self->header.needs_swap)
 758                 perf_event_header__bswap(&event->header);
 759         size = event->header.size;
 760         if (size == 0)
 761                 size = 8;
 762
 763         if (head + event->header.size >= page_size * self->mmap_window) {
 764                 int munmap_ret;
 765
 766                 shift = page_size * (head / page_size);
 767
 768                 munmap_ret = munmap(buf, page_size * self->mmap_window);
 769                 assert(munmap_ret == 0);
 770
 771                 offset += shift;
 772                 head -= shift;
 773                 goto remap;
 774         }
 775
 776         size = event->header.size;
 777
 778         dump_printf("\n%#Lx [%#x]: event: %d\n",
 779                     offset + head, event->header.size, event->header.type);
 780
 781         if (size == 0 ||
 782             perf_session__process_event(self, event, ops, offset, head) < 0) {
 783                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 784                             offset + head, event->header.size,
 785                             event->header.type);
 786                 /*
 787                  * assume we lost track of the stream, check alignment, and
 788                  * increment a single u64 in the hope to catch on again 'soon'.
 789                  */
 790                 if (unlikely(head & 7))
 791                         head &= ~7ULL;
 792
 793                 size = 8;
 794         }
 795
 796         head += size;
 797
 798         if (offset + head >= data_offset + data_size)
 799                 goto done;
 800
 801         if (offset + head < file_size)
 802                 goto more;
 803 done:
 804         err = 0;
 805         /* do the final flush for ordered samples */
 806         self->ordered_samples.next_flush = ULLONG_MAX;
 807         flush_sample_queue(self, ops);
 808 out_err:
 809         ui_progress__delete(progress);
 810         return err;
 811 }
 812
 813 int perf_session__process_events(struct perf_session *self,
 814                                  struct perf_event_ops *ops)
 815 {
 816         int err;
 817
 818         if (perf_session__register_idle_thread(self) == NULL)
 819                 return -ENOMEM;
 820
 821         if (!symbol_conf.full_paths) {
 822                 char bf[PATH_MAX];
 823
 824                 if (getcwd(bf, sizeof(bf)) == NULL) {
 825                         err = -errno;
 826 out_getcwd_err:
 827                         pr_err("failed to get the current directory\n");
 828                         goto out_err;
 829                 }
 830                 self->cwd = strdup(bf);
 831                 if (self->cwd == NULL) {
 832                         err = -ENOMEM;
 833                         goto out_getcwd_err;
 834                 }
 835                 self->cwdlen = strlen(self->cwd);
 836         }
 837
 838         if (!self->fd_pipe)
 839                 err = __perf_session__process_events(self,
 840                                                      self->header.data_offset,
 841                                                      self->header.data_size,
 842                                                      self->size, ops);
 843         else
 844                 err = __perf_session__process_pipe_events(self, ops);
 845 out_err:
 846         return err;
 847 }
 848
 849 bool perf_session__has_traces(struct perf_session *self, const char *msg)
 850 {
 851         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
 852                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
 853                 return false;
 854         }
 855
 856         return true;
 857 }
 858
 859 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
 860                                              const char *symbol_name,
 861                                              u64 addr)
 862 {
 863         char *bracket;
 864         enum map_type i;
 865         struct ref_reloc_sym *ref;
 866
 867         ref = zalloc(sizeof(struct ref_reloc_sym));
 868         if (ref == NULL)
 869                 return -ENOMEM;
 870
 871         ref->name = strdup(symbol_name);
 872         if (ref->name == NULL) {
 873                 free(ref);
 874                 return -ENOMEM;
 875         }
 876
 877         bracket = strchr(ref->name, ']');
 878         if (bracket)
 879                 *bracket = '\0';
 880
 881         ref->addr = addr;
 882
 883         for (i = 0; i < MAP__NR_TYPES; ++i) {
 884                 struct kmap *kmap = map__kmap(maps[i]);
 885                 kmap->ref_reloc_sym = ref;
 886         }
 887
 888         return 0;
 889 }
 890
 891 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
 892 {
 893         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
 894                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
 895                machines__fprintf_dsos(&self->machines, fp);
 896 }