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