SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         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 int process_finished_round_stub(event_t *event __used,
 197                                        struct perf_session *session __used,
 198                                        struct perf_event_ops *ops __used)
 199 {
 200         dump_printf(": unhandled!\n");
 201         return 0;
 202 }
 203
 204 static int process_finished_round(event_t *event,
 205                                   struct perf_session *session,
 206                                   struct perf_event_ops *ops);
 207
 208 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
 209 {
 210         if (handler->sample == NULL)
 211                 handler->sample = process_event_stub;
 212         if (handler->mmap == NULL)
 213                 handler->mmap = process_event_stub;
 214         if (handler->comm == NULL)
 215                 handler->comm = process_event_stub;
 216         if (handler->fork == NULL)
 217                 handler->fork = process_event_stub;
 218         if (handler->exit == NULL)
 219                 handler->exit = process_event_stub;
 220         if (handler->lost == NULL)
 221                 handler->lost = process_event_stub;
 222         if (handler->read == NULL)
 223                 handler->read = process_event_stub;
 224         if (handler->throttle == NULL)
 225                 handler->throttle = process_event_stub;
 226         if (handler->unthrottle == NULL)
 227                 handler->unthrottle = process_event_stub;
 228         if (handler->attr == NULL)
 229                 handler->attr = process_event_stub;
 230         if (handler->event_type == NULL)
 231                 handler->event_type = process_event_stub;
 232         if (handler->tracing_data == NULL)
 233                 handler->tracing_data = process_event_stub;
 234         if (handler->build_id == NULL)
 235                 handler->build_id = process_event_stub;
 236         if (handler->finished_round == NULL) {
 237                 if (handler->ordered_samples)
 238                         handler->finished_round = process_finished_round;
 239                 else
 240                         handler->finished_round = process_finished_round_stub;
 241         }
 242 }
 243
 244 static const char *event__name[] = {
 245         [0]                      = "TOTAL",
 246         [PERF_RECORD_MMAP]       = "MMAP",
 247         [PERF_RECORD_LOST]       = "LOST",
 248         [PERF_RECORD_COMM]       = "COMM",
 249         [PERF_RECORD_EXIT]       = "EXIT",
 250         [PERF_RECORD_THROTTLE]   = "THROTTLE",
 251         [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
 252         [PERF_RECORD_FORK]       = "FORK",
 253         [PERF_RECORD_READ]       = "READ",
 254         [PERF_RECORD_SAMPLE]     = "SAMPLE",
 255         [PERF_RECORD_HEADER_ATTR]        = "ATTR",
 256         [PERF_RECORD_HEADER_EVENT_TYPE]  = "EVENT_TYPE",
 257         [PERF_RECORD_HEADER_TRACING_DATA]        = "TRACING_DATA",
 258         [PERF_RECORD_HEADER_BUILD_ID]    = "BUILD_ID",
 259 };
 260
 261 unsigned long event__total[PERF_RECORD_HEADER_MAX];
 262
 263 void event__print_totals(void)
 264 {
 265         int i;
 266         for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
 267                 if (!event__name[i])
 268                         continue;
 269                 pr_info("%10s events: %10ld\n",
 270                         event__name[i], event__total[i]);
 271         }
 272 }
 273
 274 void mem_bswap_64(void *src, int byte_size)
 275 {
 276         u64 *m = src;
 277
 278         while (byte_size > 0) {
 279                 *m = bswap_64(*m);
 280                 byte_size -= sizeof(u64);
 281                 ++m;
 282         }
 283 }
 284
 285 static void event__all64_swap(event_t *self)
 286 {
 287         struct perf_event_header *hdr = &self->header;
 288         mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
 289 }
 290
 291 static void event__comm_swap(event_t *self)
 292 {
 293         self->comm.pid = bswap_32(self->comm.pid);
 294         self->comm.tid = bswap_32(self->comm.tid);
 295 }
 296
 297 static void event__mmap_swap(event_t *self)
 298 {
 299         self->mmap.pid   = bswap_32(self->mmap.pid);
 300         self->mmap.tid   = bswap_32(self->mmap.tid);
 301         self->mmap.start = bswap_64(self->mmap.start);
 302         self->mmap.len   = bswap_64(self->mmap.len);
 303         self->mmap.pgoff = bswap_64(self->mmap.pgoff);
 304 }
 305
 306 static void event__task_swap(event_t *self)
 307 {
 308         self->fork.pid  = bswap_32(self->fork.pid);
 309         self->fork.tid  = bswap_32(self->fork.tid);
 310         self->fork.ppid = bswap_32(self->fork.ppid);
 311         self->fork.ptid = bswap_32(self->fork.ptid);
 312         self->fork.time = bswap_64(self->fork.time);
 313 }
 314
 315 static void event__read_swap(event_t *self)
 316 {
 317         self->read.pid          = bswap_32(self->read.pid);
 318         self->read.tid          = bswap_32(self->read.tid);
 319         self->read.value        = bswap_64(self->read.value);
 320         self->read.time_enabled = bswap_64(self->read.time_enabled);
 321         self->read.time_running = bswap_64(self->read.time_running);
 322         self->read.id           = bswap_64(self->read.id);
 323 }
 324
 325 static void event__attr_swap(event_t *self)
 326 {
 327         size_t size;
 328
 329         self->attr.attr.type            = bswap_32(self->attr.attr.type);
 330         self->attr.attr.size            = bswap_32(self->attr.attr.size);
 331         self->attr.attr.config          = bswap_64(self->attr.attr.config);
 332         self->attr.attr.sample_period   = bswap_64(self->attr.attr.sample_period);
 333         self->attr.attr.sample_type     = bswap_64(self->attr.attr.sample_type);
 334         self->attr.attr.read_format     = bswap_64(self->attr.attr.read_format);
 335         self->attr.attr.wakeup_events   = bswap_32(self->attr.attr.wakeup_events);
 336         self->attr.attr.bp_type         = bswap_32(self->attr.attr.bp_type);
 337         self->attr.attr.bp_addr         = bswap_64(self->attr.attr.bp_addr);
 338         self->attr.attr.bp_len          = bswap_64(self->attr.attr.bp_len);
 339
 340         size = self->header.size;
 341         size -= (void *)&self->attr.id - (void *)self;
 342         mem_bswap_64(self->attr.id, size);
 343 }
 344
 345 static void event__event_type_swap(event_t *self)
 346 {
 347         self->event_type.event_type.event_id =
 348                 bswap_64(self->event_type.event_type.event_id);
 349 }
 350
 351 static void event__tracing_data_swap(event_t *self)
 352 {
 353         self->tracing_data.size = bswap_32(self->tracing_data.size);
 354 }
 355
 356 typedef void (*event__swap_op)(event_t *self);
 357
 358 static event__swap_op event__swap_ops[] = {
 359         [PERF_RECORD_MMAP]   = event__mmap_swap,
 360         [PERF_RECORD_COMM]   = event__comm_swap,
 361         [PERF_RECORD_FORK]   = event__task_swap,
 362         [PERF_RECORD_EXIT]   = event__task_swap,
 363         [PERF_RECORD_LOST]   = event__all64_swap,
 364         [PERF_RECORD_READ]   = event__read_swap,
 365         [PERF_RECORD_SAMPLE] = event__all64_swap,
 366         [PERF_RECORD_HEADER_ATTR]   = event__attr_swap,
 367         [PERF_RECORD_HEADER_EVENT_TYPE]   = event__event_type_swap,
 368         [PERF_RECORD_HEADER_TRACING_DATA]   = event__tracing_data_swap,
 369         [PERF_RECORD_HEADER_BUILD_ID]   = NULL,
 370         [PERF_RECORD_HEADER_MAX]    = NULL,
 371 };
 372
 373 struct sample_queue {
 374         u64                     timestamp;
 375         struct sample_event     *event;
 376         struct list_head        list;
 377 };
 378
 379 static void flush_sample_queue(struct perf_session *s,
 380                                struct perf_event_ops *ops)
 381 {
 382         struct list_head *head = &s->ordered_samples.samples_head;
 383         u64 limit = s->ordered_samples.next_flush;
 384         struct sample_queue *tmp, *iter;
 385
 386         if (!ops->ordered_samples || !limit)
 387                 return;
 388
 389         list_for_each_entry_safe(iter, tmp, head, list) {
 390                 if (iter->timestamp > limit)
 391                         return;
 392
 393                 if (iter == s->ordered_samples.last_inserted)
 394                         s->ordered_samples.last_inserted = NULL;
 395
 396                 ops->sample((event_t *)iter->event, s);
 397
 398                 s->ordered_samples.last_flush = iter->timestamp;
 399                 list_del(&iter->list);
 400                 free(iter->event);
 401                 free(iter);
 402         }
 403 }
 404
 405 /*
 406  * When perf record finishes a pass on every buffers, it records this pseudo
 407  * event.
 408  * We record the max timestamp t found in the pass n.
 409  * Assuming these timestamps are monotonic across cpus, we know that if
 410  * a buffer still has events with timestamps below t, they will be all
 411  * available and then read in the pass n + 1.
 412  * Hence when we start to read the pass n + 2, we can safely flush every
 413  * events with timestamps below t.
 414  *
 415  *    ============ PASS n =================
 416  *       CPU 0         |   CPU 1
 417  *                     |
 418  *    cnt1 timestamps  |   cnt2 timestamps
 419  *          1          |         2
 420  *          2          |         3
 421  *          -          |         4  <--- max recorded
 422  *
 423  *    ============ PASS n + 1 ==============
 424  *       CPU 0         |   CPU 1
 425  *                     |
 426  *    cnt1 timestamps  |   cnt2 timestamps
 427  *          3          |         5
 428  *          4          |         6
 429  *          5          |         7 <---- max recorded
 430  *
 431  *      Flush every events below timestamp 4
 432  *
 433  *    ============ PASS n + 2 ==============
 434  *       CPU 0         |   CPU 1
 435  *                     |
 436  *    cnt1 timestamps  |   cnt2 timestamps
 437  *          6          |         8
 438  *          7          |         9
 439  *          -          |         10
 440  *
 441  *      Flush every events below timestamp 7
 442  *      etc...
 443  */
 444 static int process_finished_round(event_t *event __used,
 445                                   struct perf_session *session,
 446                                   struct perf_event_ops *ops)
 447 {
 448         flush_sample_queue(session, ops);
 449         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 450
 451         return 0;
 452 }
 453
 454 static void __queue_sample_end(struct sample_queue *new, struct list_head *head)
 455 {
 456         struct sample_queue *iter;
 457
 458         list_for_each_entry_reverse(iter, head, list) {
 459                 if (iter->timestamp < new->timestamp) {
 460                         list_add(&new->list, &iter->list);
 461                         return;
 462                 }
 463         }
 464
 465         list_add(&new->list, head);
 466 }
 467
 468 static void __queue_sample_before(struct sample_queue *new,
 469                                   struct sample_queue *iter,
 470                                   struct list_head *head)
 471 {
 472         list_for_each_entry_continue_reverse(iter, head, list) {
 473                 if (iter->timestamp < new->timestamp) {
 474                         list_add(&new->list, &iter->list);
 475                         return;
 476                 }
 477         }
 478
 479         list_add(&new->list, head);
 480 }
 481
 482 static void __queue_sample_after(struct sample_queue *new,
 483                                  struct sample_queue *iter,
 484                                  struct list_head *head)
 485 {
 486         list_for_each_entry_continue(iter, head, list) {
 487                 if (iter->timestamp > new->timestamp) {
 488                         list_add_tail(&new->list, &iter->list);
 489                         return;
 490                 }
 491         }
 492         list_add_tail(&new->list, head);
 493 }
 494
 495 /* The queue is ordered by time */
 496 static void __queue_sample_event(struct sample_queue *new,
 497                                  struct perf_session *s)
 498 {
 499         struct sample_queue *last_inserted = s->ordered_samples.last_inserted;
 500         struct list_head *head = &s->ordered_samples.samples_head;
 501
 502
 503         if (!last_inserted) {
 504                 __queue_sample_end(new, head);
 505                 return;
 506         }
 507
 508         /*
 509          * Most of the time the current event has a timestamp
 510          * very close to the last event inserted, unless we just switched
 511          * to another event buffer. Having a sorting based on a list and
 512          * on the last inserted event that is close to the current one is
 513          * probably more efficient than an rbtree based sorting.
 514          */
 515         if (last_inserted->timestamp >= new->timestamp)
 516                 __queue_sample_before(new, last_inserted, head);
 517         else
 518                 __queue_sample_after(new, last_inserted, head);
 519 }
 520
 521 static int queue_sample_event(event_t *event, struct sample_data *data,
 522                               struct perf_session *s)
 523 {
 524         u64 timestamp = data->time;
 525         struct sample_queue *new;
 526
 527
 528         if (timestamp < s->ordered_samples.last_flush) {
 529                 printf("Warning: Timestamp below last timeslice flush\n");
 530                 return -EINVAL;
 531         }
 532
 533         new = malloc(sizeof(*new));
 534         if (!new)
 535                 return -ENOMEM;
 536
 537         new->timestamp = timestamp;
 538
 539         new->event = malloc(event->header.size);
 540         if (!new->event) {
 541                 free(new);
 542                 return -ENOMEM;
 543         }
 544
 545         memcpy(new->event, event, event->header.size);
 546
 547         __queue_sample_event(new, s);
 548         s->ordered_samples.last_inserted = new;
 549
 550         if (new->timestamp > s->ordered_samples.max_timestamp)
 551                 s->ordered_samples.max_timestamp = new->timestamp;
 552
 553         return 0;
 554 }
 555
 556 static int perf_session__process_sample(event_t *event, struct perf_session *s,
 557                                         struct perf_event_ops *ops)
 558 {
 559         struct sample_data data;
 560
 561         if (!ops->ordered_samples)
 562                 return ops->sample(event, s);
 563
 564         bzero(&data, sizeof(struct sample_data));
 565         event__parse_sample(event, s->sample_type, &data);
 566
 567         queue_sample_event(event, &data, s);
 568
 569         return 0;
 570 }
 571
 572 static int perf_session__process_event(struct perf_session *self,
 573                                        event_t *event,
 574                                        struct perf_event_ops *ops,
 575                                        u64 offset, u64 head)
 576 {
 577         trace_event(event);
 578
 579         if (event->header.type < PERF_RECORD_HEADER_MAX) {
 580                 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
 581                             offset + head, event->header.size,
 582                             event__name[event->header.type]);
 583                 ++event__total[0];
 584                 ++event__total[event->header.type];
 585         }
 586
 587         if (self->header.needs_swap && event__swap_ops[event->header.type])
 588                 event__swap_ops[event->header.type](event);
 589
 590         switch (event->header.type) {
 591         case PERF_RECORD_SAMPLE:
 592                 return perf_session__process_sample(event, self, ops);
 593         case PERF_RECORD_MMAP:
 594                 return ops->mmap(event, self);
 595         case PERF_RECORD_COMM:
 596                 return ops->comm(event, self);
 597         case PERF_RECORD_FORK:
 598                 return ops->fork(event, self);
 599         case PERF_RECORD_EXIT:
 600                 return ops->exit(event, self);
 601         case PERF_RECORD_LOST:
 602                 return ops->lost(event, self);
 603         case PERF_RECORD_READ:
 604                 return ops->read(event, self);
 605         case PERF_RECORD_THROTTLE:
 606                 return ops->throttle(event, self);
 607         case PERF_RECORD_UNTHROTTLE:
 608                 return ops->unthrottle(event, self);
 609         case PERF_RECORD_HEADER_ATTR:
 610                 return ops->attr(event, self);
 611         case PERF_RECORD_HEADER_EVENT_TYPE:
 612                 return ops->event_type(event, self);
 613         case PERF_RECORD_HEADER_TRACING_DATA:
 614                 /* setup for reading amidst mmap */
 615                 lseek(self->fd, offset + head, SEEK_SET);
 616                 return ops->tracing_data(event, self);
 617         case PERF_RECORD_HEADER_BUILD_ID:
 618                 return ops->build_id(event, self);
 619         case PERF_RECORD_FINISHED_ROUND:
 620                 return ops->finished_round(event, self, ops);
 621         default:
 622                 self->unknown_events++;
 623                 return -1;
 624         }
 625 }
 626
 627 void perf_event_header__bswap(struct perf_event_header *self)
 628 {
 629         self->type = bswap_32(self->type);
 630         self->misc = bswap_16(self->misc);
 631         self->size = bswap_16(self->size);
 632 }
 633
 634 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
 635 {
 636         struct thread *thread = perf_session__findnew(self, 0);
 637
 638         if (thread == NULL || thread__set_comm(thread, "swapper")) {
 639                 pr_err("problem inserting idle task.\n");
 640                 thread = NULL;
 641         }
 642
 643         return thread;
 644 }
 645
 646 int do_read(int fd, void *buf, size_t size)
 647 {
 648         void *buf_start = buf;
 649
 650         while (size) {
 651                 int ret = read(fd, buf, size);
 652
 653                 if (ret <= 0)
 654                         return ret;
 655
 656                 size -= ret;
 657                 buf += ret;
 658         }
 659
 660         return buf - buf_start;
 661 }
 662
 663 #define session_done()  (*(volatile int *)(&session_done))
 664 volatile int session_done;
 665
 666 static int __perf_session__process_pipe_events(struct perf_session *self,
 667                                                struct perf_event_ops *ops)
 668 {
 669         event_t event;
 670         uint32_t size;
 671         int skip = 0;
 672         u64 head;
 673         int err;
 674         void *p;
 675
 676         perf_event_ops__fill_defaults(ops);
 677
 678         head = 0;
 679 more:
 680         err = do_read(self->fd, &event, sizeof(struct perf_event_header));
 681         if (err <= 0) {
 682                 if (err == 0)
 683                         goto done;
 684
 685                 pr_err("failed to read event header\n");
 686                 goto out_err;
 687         }
 688
 689         if (self->header.needs_swap)
 690                 perf_event_header__bswap(&event.header);
 691
 692         size = event.header.size;
 693         if (size == 0)
 694                 size = 8;
 695
 696         p = &event;
 697         p += sizeof(struct perf_event_header);
 698
 699         err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
 700         if (err <= 0) {
 701                 if (err == 0) {
 702                         pr_err("unexpected end of event stream\n");
 703                         goto done;
 704                 }
 705
 706                 pr_err("failed to read event data\n");
 707                 goto out_err;
 708         }
 709
 710         if (size == 0 ||
 711             (skip = perf_session__process_event(self, &event, ops,
 712                                                 0, head)) < 0) {
 713                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 714                             head, event.header.size, event.header.type);
 715                 /*
 716                  * assume we lost track of the stream, check alignment, and
 717                  * increment a single u64 in the hope to catch on again 'soon'.
 718                  */
 719                 if (unlikely(head & 7))
 720                         head &= ~7ULL;
 721
 722                 size = 8;
 723         }
 724
 725         head += size;
 726
 727         dump_printf("\n%#Lx [%#x]: event: %d\n",
 728                     head, event.header.size, event.header.type);
 729
 730         if (skip > 0)
 731                 head += skip;
 732
 733         if (!session_done())
 734                 goto more;
 735 done:
 736         err = 0;
 737 out_err:
 738         return err;
 739 }
 740
 741 int __perf_session__process_events(struct perf_session *self,
 742                                    u64 data_offset, u64 data_size,
 743                                    u64 file_size, struct perf_event_ops *ops)
 744 {
 745         int err, mmap_prot, mmap_flags;
 746         u64 head, shift;
 747         u64 offset = 0;
 748         size_t  page_size;
 749         event_t *event;
 750         uint32_t size;
 751         char *buf;
 752         struct ui_progress *progress = ui_progress__new("Processing events...",
 753                                                         self->size);
 754         if (progress == NULL)
 755                 return -1;
 756
 757         perf_event_ops__fill_defaults(ops);
 758
 759         page_size = sysconf(_SC_PAGESIZE);
 760
 761         head = data_offset;
 762         shift = page_size * (head / page_size);
 763         offset += shift;
 764         head -= shift;
 765
 766         mmap_prot  = PROT_READ;
 767         mmap_flags = MAP_SHARED;
 768
 769         if (self->header.needs_swap) {
 770                 mmap_prot  |= PROT_WRITE;
 771                 mmap_flags = MAP_PRIVATE;
 772         }
 773 remap:
 774         buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
 775                    mmap_flags, self->fd, offset);
 776         if (buf == MAP_FAILED) {
 777                 pr_err("failed to mmap file\n");
 778                 err = -errno;
 779                 goto out_err;
 780         }
 781
 782 more:
 783         event = (event_t *)(buf + head);
 784         ui_progress__update(progress, offset);
 785
 786         if (self->header.needs_swap)
 787                 perf_event_header__bswap(&event->header);
 788         size = event->header.size;
 789         if (size == 0)
 790                 size = 8;
 791
 792         if (head + event->header.size >= page_size * self->mmap_window) {
 793                 int munmap_ret;
 794
 795                 shift = page_size * (head / page_size);
 796
 797                 munmap_ret = munmap(buf, page_size * self->mmap_window);
 798                 assert(munmap_ret == 0);
 799
 800                 offset += shift;
 801                 head -= shift;
 802                 goto remap;
 803         }
 804
 805         size = event->header.size;
 806
 807         dump_printf("\n%#Lx [%#x]: event: %d\n",
 808                     offset + head, event->header.size, event->header.type);
 809
 810         if (size == 0 ||
 811             perf_session__process_event(self, event, ops, offset, head) < 0) {
 812                 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
 813                             offset + head, event->header.size,
 814                             event->header.type);
 815                 /*
 816                  * assume we lost track of the stream, check alignment, and
 817                  * increment a single u64 in the hope to catch on again 'soon'.
 818                  */
 819                 if (unlikely(head & 7))
 820                         head &= ~7ULL;
 821
 822                 size = 8;
 823         }
 824
 825         head += size;
 826
 827         if (offset + head >= data_offset + data_size)
 828                 goto done;
 829
 830         if (offset + head < file_size)
 831                 goto more;
 832 done:
 833         err = 0;
 834         /* do the final flush for ordered samples */
 835         self->ordered_samples.next_flush = ULLONG_MAX;
 836         flush_sample_queue(self, ops);
 837 out_err:
 838         ui_progress__delete(progress);
 839         return err;
 840 }
 841
 842 int perf_session__process_events(struct perf_session *self,
 843                                  struct perf_event_ops *ops)
 844 {
 845         int err;
 846
 847         if (perf_session__register_idle_thread(self) == NULL)
 848                 return -ENOMEM;
 849
 850         if (!symbol_conf.full_paths) {
 851                 char bf[PATH_MAX];
 852
 853                 if (getcwd(bf, sizeof(bf)) == NULL) {
 854                         err = -errno;
 855 out_getcwd_err:
 856                         pr_err("failed to get the current directory\n");
 857                         goto out_err;
 858                 }
 859                 self->cwd = strdup(bf);
 860                 if (self->cwd == NULL) {
 861                         err = -ENOMEM;
 862                         goto out_getcwd_err;
 863                 }
 864                 self->cwdlen = strlen(self->cwd);
 865         }
 866
 867         if (!self->fd_pipe)
 868                 err = __perf_session__process_events(self,
 869                                                      self->header.data_offset,
 870                                                      self->header.data_size,
 871                                                      self->size, ops);
 872         else
 873                 err = __perf_session__process_pipe_events(self, ops);
 874 out_err:
 875         return err;
 876 }
 877
 878 bool perf_session__has_traces(struct perf_session *self, const char *msg)
 879 {
 880         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
 881                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
 882                 return false;
 883         }
 884
 885         return true;
 886 }
 887
 888 int perf_session__set_kallsyms_ref_reloc_sym(struct map **maps,
 889                                              const char *symbol_name,
 890                                              u64 addr)
 891 {
 892         char *bracket;
 893         enum map_type i;
 894         struct ref_reloc_sym *ref;
 895
 896         ref = zalloc(sizeof(struct ref_reloc_sym));
 897         if (ref == NULL)
 898                 return -ENOMEM;
 899
 900         ref->name = strdup(symbol_name);
 901         if (ref->name == NULL) {
 902                 free(ref);
 903                 return -ENOMEM;
 904         }
 905
 906         bracket = strchr(ref->name, ']');
 907         if (bracket)
 908                 *bracket = '\0';
 909
 910         ref->addr = addr;
 911
 912         for (i = 0; i < MAP__NR_TYPES; ++i) {
 913                 struct kmap *kmap = map__kmap(maps[i]);
 914                 kmap->ref_reloc_sym = ref;
 915         }
 916
 917         return 0;
 918 }