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