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