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 #include <sys/mman.h>
   9
  10 #include "evlist.h"
  11 #include "evsel.h"
  12 #include "session.h"
  13 #include "tool.h"
  14 #include "sort.h"
  15 #include "util.h"
  16 #include "cpumap.h"
  17
  18 static int perf_session__open(struct perf_session *self, bool force)
  19 {
  20         struct stat input_stat;
  21
  22         if (!strcmp(self->filename, "-")) {
  23                 self->fd_pipe = true;
  24                 self->fd = STDIN_FILENO;
  25
  26                 if (perf_session__read_header(self, self->fd) < 0)
  27                         pr_err("incompatible file format (rerun with -v to learn more)");
  28
  29                 return 0;
  30         }
  31
  32         self->fd = open(self->filename, O_RDONLY);
  33         if (self->fd < 0) {
  34                 int err = errno;
  35
  36                 pr_err("failed to open %s: %s", self->filename, strerror(err));
  37                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
  38                         pr_err("  (try 'perf record' first)");
  39                 pr_err("\n");
  40                 return -errno;
  41         }
  42
  43         if (fstat(self->fd, &input_stat) < 0)
  44                 goto out_close;
  45
  46         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  47                 pr_err("file %s not owned by current user or root\n",
  48                        self->filename);
  49                 goto out_close;
  50         }
  51
  52         if (!input_stat.st_size) {
  53                 pr_info("zero-sized file (%s), nothing to do!\n",
  54                         self->filename);
  55                 goto out_close;
  56         }
  57
  58         if (perf_session__read_header(self, self->fd) < 0) {
  59                 pr_err("incompatible file format (rerun with -v to learn more)");
  60                 goto out_close;
  61         }
  62
  63         if (!perf_evlist__valid_sample_type(self->evlist)) {
  64                 pr_err("non matching sample_type");
  65                 goto out_close;
  66         }
  67
  68         if (!perf_evlist__valid_sample_id_all(self->evlist)) {
  69                 pr_err("non matching sample_id_all");
  70                 goto out_close;
  71         }
  72
  73         self->size = input_stat.st_size;
  74         return 0;
  75
  76 out_close:
  77         close(self->fd);
  78         self->fd = -1;
  79         return -1;
  80 }
  81
  82 void perf_session__update_sample_type(struct perf_session *self)
  83 {
  84         self->sample_type = perf_evlist__sample_type(self->evlist);
  85         self->sample_size = __perf_evsel__sample_size(self->sample_type);
  86         self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
  87         self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
  88         self->host_machine.id_hdr_size = self->id_hdr_size;
  89 }
  90
  91 int perf_session__create_kernel_maps(struct perf_session *self)
  92 {
  93         int ret = machine__create_kernel_maps(&self->host_machine);
  94
  95         if (ret >= 0)
  96                 ret = machines__create_guest_kernel_maps(&self->machines);
  97         return ret;
  98 }
  99
 100 static void perf_session__destroy_kernel_maps(struct perf_session *self)
 101 {
 102         machine__destroy_kernel_maps(&self->host_machine);
 103         machines__destroy_guest_kernel_maps(&self->machines);
 104 }
 105
 106 struct perf_session *perf_session__new(const char *filename, int mode,
 107                                        bool force, bool repipe,
 108                                        struct perf_tool *tool)
 109 {
 110         struct perf_session *self;
 111         struct stat st;
 112         size_t len;
 113
 114         if (!filename || !strlen(filename)) {
 115                 if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
 116                         filename = "-";
 117                 else
 118                         filename = "perf.data";
 119         }
 120
 121         len = strlen(filename);
 122         self = zalloc(sizeof(*self) + len);
 123
 124         if (self == NULL)
 125                 goto out;
 126
 127         memcpy(self->filename, filename, len);
 128         /*
 129          * On 64bit we can mmap the data file in one go. No need for tiny mmap
 130          * slices. On 32bit we use 32MB.
 131          */
 132 #if BITS_PER_LONG == 64
 133         self->mmap_window = ULLONG_MAX;
 134 #else
 135         self->mmap_window = 32 * 1024 * 1024ULL;
 136 #endif
 137         self->machines = RB_ROOT;
 138         self->repipe = repipe;
 139         INIT_LIST_HEAD(&self->ordered_samples.samples);
 140         INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
 141         INIT_LIST_HEAD(&self->ordered_samples.to_free);
 142         machine__init(&self->host_machine, "", HOST_KERNEL_ID);
 143         hists__init(&self->hists);
 144
 145         if (mode == O_RDONLY) {
 146                 if (perf_session__open(self, force) < 0)
 147                         goto out_delete;
 148                 perf_session__update_sample_type(self);
 149         } else if (mode == O_WRONLY) {
 150                 /*
 151                  * In O_RDONLY mode this will be performed when reading the
 152                  * kernel MMAP event, in perf_event__process_mmap().
 153                  */
 154                 if (perf_session__create_kernel_maps(self) < 0)
 155                         goto out_delete;
 156         }
 157
 158         if (tool && tool->ordering_requires_timestamps &&
 159             tool->ordered_samples && !self->sample_id_all) {
 160                 dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 161                 tool->ordered_samples = false;
 162         }
 163
 164 out:
 165         return self;
 166 out_delete:
 167         perf_session__delete(self);
 168         return NULL;
 169 }
 170
 171 static void machine__delete_dead_threads(struct machine *machine)
 172 {
 173         struct thread *n, *t;
 174
 175         list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
 176                 list_del(&t->node);
 177                 thread__delete(t);
 178         }
 179 }
 180
 181 static void perf_session__delete_dead_threads(struct perf_session *session)
 182 {
 183         machine__delete_dead_threads(&session->host_machine);
 184 }
 185
 186 static void machine__delete_threads(struct machine *self)
 187 {
 188         struct rb_node *nd = rb_first(&self->threads);
 189
 190         while (nd) {
 191                 struct thread *t = rb_entry(nd, struct thread, rb_node);
 192
 193                 rb_erase(&t->rb_node, &self->threads);
 194                 nd = rb_next(nd);
 195                 thread__delete(t);
 196         }
 197 }
 198
 199 static void perf_session__delete_threads(struct perf_session *session)
 200 {
 201         machine__delete_threads(&session->host_machine);
 202 }
 203
 204 void perf_session__delete(struct perf_session *self)
 205 {
 206         perf_session__destroy_kernel_maps(self);
 207         perf_session__delete_dead_threads(self);
 208         perf_session__delete_threads(self);
 209         machine__exit(&self->host_machine);
 210         close(self->fd);
 211         free(self);
 212 }
 213
 214 void machine__remove_thread(struct machine *self, struct thread *th)
 215 {
 216         self->last_match = NULL;
 217         rb_erase(&th->rb_node, &self->threads);
 218         /*
 219          * We may have references to this thread, for instance in some hist_entry
 220          * instances, so just move them to a separate list.
 221          */
 222         list_add_tail(&th->node, &self->dead_threads);
 223 }
 224
 225 static bool symbol__match_parent_regex(struct symbol *sym)
 226 {
 227         if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
 228                 return 1;
 229
 230         return 0;
 231 }
 232
 233 static const u8 cpumodes[] = {
 234         PERF_RECORD_MISC_USER,
 235         PERF_RECORD_MISC_KERNEL,
 236         PERF_RECORD_MISC_GUEST_USER,
 237         PERF_RECORD_MISC_GUEST_KERNEL
 238 };
 239 #define NCPUMODES (sizeof(cpumodes)/sizeof(u8))
 240
 241 static void ip__resolve_ams(struct machine *self, struct thread *thread,
 242                             struct addr_map_symbol *ams,
 243                             u64 ip)
 244 {
 245         struct addr_location al;
 246         size_t i;
 247         u8 m;
 248
 249         memset(&al, 0, sizeof(al));
 250
 251         for (i = 0; i < NCPUMODES; i++) {
 252                 m = cpumodes[i];
 253                 /*
 254                  * We cannot use the header.misc hint to determine whether a
 255                  * branch stack address is user, kernel, guest, hypervisor.
 256                  * Branches may straddle the kernel/user/hypervisor boundaries.
 257                  * Thus, we have to try consecutively until we find a match
 258                  * or else, the symbol is unknown
 259                  */
 260                 thread__find_addr_location(thread, self, m, MAP__FUNCTION,
 261                                 ip, &al, NULL);
 262                 if (al.sym)
 263                         goto found;
 264         }
 265 found:
 266         ams->addr = ip;
 267         ams->al_addr = al.addr;
 268         ams->sym = al.sym;
 269         ams->map = al.map;
 270 }
 271
 272 struct branch_info *machine__resolve_bstack(struct machine *self,
 273                                             struct thread *thr,
 274                                             struct branch_stack *bs)
 275 {
 276         struct branch_info *bi;
 277         unsigned int i;
 278
 279         bi = calloc(bs->nr, sizeof(struct branch_info));
 280         if (!bi)
 281                 return NULL;
 282
 283         for (i = 0; i < bs->nr; i++) {
 284                 ip__resolve_ams(self, thr, &bi[i].to, bs->entries[i].to);
 285                 ip__resolve_ams(self, thr, &bi[i].from, bs->entries[i].from);
 286                 bi[i].flags = bs->entries[i].flags;
 287         }
 288         return bi;
 289 }
 290
 291 int machine__resolve_callchain(struct machine *self,
 292                                struct perf_evsel *evsel __used,
 293                                struct thread *thread,
 294                                struct ip_callchain *chain,
 295                                struct symbol **parent)
 296 {
 297         u8 cpumode = PERF_RECORD_MISC_USER;
 298         unsigned int i;
 299         int err;
 300
 301         callchain_cursor_reset(&callchain_cursor);
 302
 303         if (chain->nr > PERF_MAX_STACK_DEPTH) {
 304                 pr_warning("corrupted callchain. skipping...\n");
 305                 return 0;
 306         }
 307
 308         for (i = 0; i < chain->nr; i++) {
 309                 u64 ip;
 310                 struct addr_location al;
 311
 312                 if (callchain_param.order == ORDER_CALLEE)
 313                         ip = chain->ips[i];
 314                 else
 315                         ip = chain->ips[chain->nr - i - 1];
 316
 317                 if (ip >= PERF_CONTEXT_MAX) {
 318                         switch (ip) {
 319                         case PERF_CONTEXT_HV:
 320                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 321                         case PERF_CONTEXT_KERNEL:
 322                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 323                         case PERF_CONTEXT_USER:
 324                                 cpumode = PERF_RECORD_MISC_USER;        break;
 325                         default:
 326                                 pr_debug("invalid callchain context: "
 327                                          "%"PRId64"\n", (s64) ip);
 328                                 /*
 329                                  * It seems the callchain is corrupted.
 330                                  * Discard all.
 331                                  */
 332                                 callchain_cursor_reset(&callchain_cursor);
 333                                 return 0;
 334                         }
 335                         continue;
 336                 }
 337
 338                 al.filtered = false;
 339                 thread__find_addr_location(thread, self, cpumode,
 340                                            MAP__FUNCTION, ip, &al, NULL);
 341                 if (al.sym != NULL) {
 342                         if (sort__has_parent && !*parent &&
 343                             symbol__match_parent_regex(al.sym))
 344                                 *parent = al.sym;
 345                         if (!symbol_conf.use_callchain)
 346                                 break;
 347                 }
 348
 349                 err = callchain_cursor_append(&callchain_cursor,
 350                                               ip, al.map, al.sym);
 351                 if (err)
 352                         return err;
 353         }
 354
 355         return 0;
 356 }
 357
 358 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
 359                                                  struct perf_session *session __used)
 360 {
 361         dump_printf(": unhandled!\n");
 362         return 0;
 363 }
 364
 365 static int process_event_synth_attr_stub(union perf_event *event __used,
 366                                          struct perf_evlist **pevlist __used)
 367 {
 368         dump_printf(": unhandled!\n");
 369         return 0;
 370 }
 371
 372 static int process_event_sample_stub(struct perf_tool *tool __used,
 373                                      union perf_event *event __used,
 374                                      struct perf_sample *sample __used,
 375                                      struct perf_evsel *evsel __used,
 376                                      struct machine *machine __used)
 377 {
 378         dump_printf(": unhandled!\n");
 379         return 0;
 380 }
 381
 382 static int process_event_stub(struct perf_tool *tool __used,
 383                               union perf_event *event __used,
 384                               struct perf_sample *sample __used,
 385                               struct machine *machine __used)
 386 {
 387         dump_printf(": unhandled!\n");
 388         return 0;
 389 }
 390
 391 static int process_finished_round_stub(struct perf_tool *tool __used,
 392                                        union perf_event *event __used,
 393                                        struct perf_session *perf_session __used)
 394 {
 395         dump_printf(": unhandled!\n");
 396         return 0;
 397 }
 398
 399 static int process_event_type_stub(struct perf_tool *tool __used,
 400                                    union perf_event *event __used)
 401 {
 402         dump_printf(": unhandled!\n");
 403         return 0;
 404 }
 405
 406 static int process_finished_round(struct perf_tool *tool,
 407                                   union perf_event *event,
 408                                   struct perf_session *session);
 409
 410 static void perf_tool__fill_defaults(struct perf_tool *tool)
 411 {
 412         if (tool->sample == NULL)
 413                 tool->sample = process_event_sample_stub;
 414         if (tool->mmap == NULL)
 415                 tool->mmap = process_event_stub;
 416         if (tool->comm == NULL)
 417                 tool->comm = process_event_stub;
 418         if (tool->fork == NULL)
 419                 tool->fork = process_event_stub;
 420         if (tool->exit == NULL)
 421                 tool->exit = process_event_stub;
 422         if (tool->lost == NULL)
 423                 tool->lost = perf_event__process_lost;
 424         if (tool->read == NULL)
 425                 tool->read = process_event_sample_stub;
 426         if (tool->throttle == NULL)
 427                 tool->throttle = process_event_stub;
 428         if (tool->unthrottle == NULL)
 429                 tool->unthrottle = process_event_stub;
 430         if (tool->attr == NULL)
 431                 tool->attr = process_event_synth_attr_stub;
 432         if (tool->event_type == NULL)
 433                 tool->event_type = process_event_type_stub;
 434         if (tool->tracing_data == NULL)
 435                 tool->tracing_data = process_event_synth_tracing_data_stub;
 436         if (tool->build_id == NULL)
 437                 tool->build_id = process_finished_round_stub;
 438         if (tool->finished_round == NULL) {
 439                 if (tool->ordered_samples)
 440                         tool->finished_round = process_finished_round;
 441                 else
 442                         tool->finished_round = process_finished_round_stub;
 443         }
 444 }
 445
 446 void mem_bswap_32(void *src, int byte_size)
 447 {
 448         u32 *m = src;
 449         while (byte_size > 0) {
 450                 *m = bswap_32(*m);
 451                 byte_size -= sizeof(u32);
 452                 ++m;
 453         }
 454 }
 455
 456 void mem_bswap_64(void *src, int byte_size)
 457 {
 458         u64 *m = src;
 459
 460         while (byte_size > 0) {
 461                 *m = bswap_64(*m);
 462                 byte_size -= sizeof(u64);
 463                 ++m;
 464         }
 465 }
 466
 467 static void swap_sample_id_all(union perf_event *event, void *data)
 468 {
 469         void *end = (void *) event + event->header.size;
 470         int size = end - data;
 471
 472         BUG_ON(size % sizeof(u64));
 473         mem_bswap_64(data, size);
 474 }
 475
 476 static void perf_event__all64_swap(union perf_event *event,
 477                                    bool sample_id_all __used)
 478 {
 479         struct perf_event_header *hdr = &event->header;
 480         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 481 }
 482
 483 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 484 {
 485         event->comm.pid = bswap_32(event->comm.pid);
 486         event->comm.tid = bswap_32(event->comm.tid);
 487
 488         if (sample_id_all) {
 489                 void *data = &event->comm.comm;
 490
 491                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 492                 swap_sample_id_all(event, data);
 493         }
 494 }
 495
 496 static void perf_event__mmap_swap(union perf_event *event,
 497                                   bool sample_id_all)
 498 {
 499         event->mmap.pid   = bswap_32(event->mmap.pid);
 500         event->mmap.tid   = bswap_32(event->mmap.tid);
 501         event->mmap.start = bswap_64(event->mmap.start);
 502         event->mmap.len   = bswap_64(event->mmap.len);
 503         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 504
 505         if (sample_id_all) {
 506                 void *data = &event->mmap.filename;
 507
 508                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 509                 swap_sample_id_all(event, data);
 510         }
 511 }
 512
 513 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 514 {
 515         event->fork.pid  = bswap_32(event->fork.pid);
 516         event->fork.tid  = bswap_32(event->fork.tid);
 517         event->fork.ppid = bswap_32(event->fork.ppid);
 518         event->fork.ptid = bswap_32(event->fork.ptid);
 519         event->fork.time = bswap_64(event->fork.time);
 520
 521         if (sample_id_all)
 522                 swap_sample_id_all(event, &event->fork + 1);
 523 }
 524
 525 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 526 {
 527         event->read.pid          = bswap_32(event->read.pid);
 528         event->read.tid          = bswap_32(event->read.tid);
 529         event->read.value        = bswap_64(event->read.value);
 530         event->read.time_enabled = bswap_64(event->read.time_enabled);
 531         event->read.time_running = bswap_64(event->read.time_running);
 532         event->read.id           = bswap_64(event->read.id);
 533
 534         if (sample_id_all)
 535                 swap_sample_id_all(event, &event->read + 1);
 536 }
 537
 538 static u8 revbyte(u8 b)
 539 {
 540         int rev = (b >> 4) | ((b & 0xf) << 4);
 541         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
 542         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
 543         return (u8) rev;
 544 }
 545
 546 /*
 547  * XXX this is hack in attempt to carry flags bitfield
 548  * throught endian village. ABI says:
 549  *
 550  * Bit-fields are allocated from right to left (least to most significant)
 551  * on little-endian implementations and from left to right (most to least
 552  * significant) on big-endian implementations.
 553  *
 554  * The above seems to be byte specific, so we need to reverse each
 555  * byte of the bitfield. 'Internet' also says this might be implementation
 556  * specific and we probably need proper fix and carry perf_event_attr
 557  * bitfield flags in separate data file FEAT_ section. Thought this seems
 558  * to work for now.
 559  */
 560 static void swap_bitfield(u8 *p, unsigned len)
 561 {
 562         unsigned i;
 563
 564         for (i = 0; i < len; i++) {
 565                 *p = revbyte(*p);
 566                 p++;
 567         }
 568 }
 569
 570 /* exported for swapping attributes in file header */
 571 void perf_event__attr_swap(struct perf_event_attr *attr)
 572 {
 573         attr->type              = bswap_32(attr->type);
 574         attr->size              = bswap_32(attr->size);
 575         attr->config            = bswap_64(attr->config);
 576         attr->sample_period     = bswap_64(attr->sample_period);
 577         attr->sample_type       = bswap_64(attr->sample_type);
 578         attr->read_format       = bswap_64(attr->read_format);
 579         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 580         attr->bp_type           = bswap_32(attr->bp_type);
 581         attr->bp_addr           = bswap_64(attr->bp_addr);
 582         attr->bp_len            = bswap_64(attr->bp_len);
 583
 584         swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
 585 }
 586
 587 static void perf_event__hdr_attr_swap(union perf_event *event,
 588                                       bool sample_id_all __used)
 589 {
 590         size_t size;
 591
 592         perf_event__attr_swap(&event->attr.attr);
 593
 594         size = event->header.size;
 595         size -= (void *)&event->attr.id - (void *)event;
 596         mem_bswap_64(event->attr.id, size);
 597 }
 598
 599 static void perf_event__event_type_swap(union perf_event *event,
 600                                         bool sample_id_all __used)
 601 {
 602         event->event_type.event_type.event_id =
 603                 bswap_64(event->event_type.event_type.event_id);
 604 }
 605
 606 static void perf_event__tracing_data_swap(union perf_event *event,
 607                                           bool sample_id_all __used)
 608 {
 609         event->tracing_data.size = bswap_32(event->tracing_data.size);
 610 }
 611
 612 typedef void (*perf_event__swap_op)(union perf_event *event,
 613                                     bool sample_id_all);
 614
 615 static perf_event__swap_op perf_event__swap_ops[] = {
 616         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 617         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 618         [PERF_RECORD_FORK]                = perf_event__task_swap,
 619         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 620         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 621         [PERF_RECORD_READ]                = perf_event__read_swap,
 622         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 623         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 624         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 625         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 626         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 627         [PERF_RECORD_HEADER_MAX]          = NULL,
 628 };
 629
 630 struct sample_queue {
 631         u64                     timestamp;
 632         u64                     file_offset;
 633         union perf_event        *event;
 634         struct list_head        list;
 635 };
 636
 637 static void perf_session_free_sample_buffers(struct perf_session *session)
 638 {
 639         struct ordered_samples *os = &session->ordered_samples;
 640
 641         while (!list_empty(&os->to_free)) {
 642                 struct sample_queue *sq;
 643
 644                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 645                 list_del(&sq->list);
 646                 free(sq);
 647         }
 648 }
 649
 650 static int perf_session_deliver_event(struct perf_session *session,
 651                                       union perf_event *event,
 652                                       struct perf_sample *sample,
 653                                       struct perf_tool *tool,
 654                                       u64 file_offset);
 655
 656 static void flush_sample_queue(struct perf_session *s,
 657                                struct perf_tool *tool)
 658 {
 659         struct ordered_samples *os = &s->ordered_samples;
 660         struct list_head *head = &os->samples;
 661         struct sample_queue *tmp, *iter;
 662         struct perf_sample sample;
 663         u64 limit = os->next_flush;
 664         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 665         unsigned idx = 0, progress_next = os->nr_samples / 16;
 666         int ret;
 667
 668         if (!tool->ordered_samples || !limit)
 669                 return;
 670
 671         list_for_each_entry_safe(iter, tmp, head, list) {
 672                 if (iter->timestamp > limit)
 673                         break;
 674
 675                 ret = perf_session__parse_sample(s, iter->event, &sample);
 676                 if (ret)
 677                         pr_err("Can't parse sample, err = %d\n", ret);
 678                 else
 679                         perf_session_deliver_event(s, iter->event, &sample, tool,
 680                                                    iter->file_offset);
 681
 682                 os->last_flush = iter->timestamp;
 683                 list_del(&iter->list);
 684                 list_add(&iter->list, &os->sample_cache);
 685                 if (++idx >= progress_next) {
 686                         progress_next += os->nr_samples / 16;
 687                         ui_progress__update(idx, os->nr_samples,
 688                                             "Processing time ordered events...");
 689                 }
 690         }
 691
 692         if (list_empty(head)) {
 693                 os->last_sample = NULL;
 694         } else if (last_ts <= limit) {
 695                 os->last_sample =
 696                         list_entry(head->prev, struct sample_queue, list);
 697         }
 698
 699         os->nr_samples = 0;
 700 }
 701
 702 /*
 703  * When perf record finishes a pass on every buffers, it records this pseudo
 704  * event.
 705  * We record the max timestamp t found in the pass n.
 706  * Assuming these timestamps are monotonic across cpus, we know that if
 707  * a buffer still has events with timestamps below t, they will be all
 708  * available and then read in the pass n + 1.
 709  * Hence when we start to read the pass n + 2, we can safely flush every
 710  * events with timestamps below t.
 711  *
 712  *    ============ PASS n =================
 713  *       CPU 0         |   CPU 1
 714  *                     |
 715  *    cnt1 timestamps  |   cnt2 timestamps
 716  *          1          |         2
 717  *          2          |         3
 718  *          -          |         4  <--- max recorded
 719  *
 720  *    ============ PASS n + 1 ==============
 721  *       CPU 0         |   CPU 1
 722  *                     |
 723  *    cnt1 timestamps  |   cnt2 timestamps
 724  *          3          |         5
 725  *          4          |         6
 726  *          5          |         7 <---- max recorded
 727  *
 728  *      Flush every events below timestamp 4
 729  *
 730  *    ============ PASS n + 2 ==============
 731  *       CPU 0         |   CPU 1
 732  *                     |
 733  *    cnt1 timestamps  |   cnt2 timestamps
 734  *          6          |         8
 735  *          7          |         9
 736  *          -          |         10
 737  *
 738  *      Flush every events below timestamp 7
 739  *      etc...
 740  */
 741 static int process_finished_round(struct perf_tool *tool,
 742                                   union perf_event *event __used,
 743                                   struct perf_session *session)
 744 {
 745         flush_sample_queue(session, tool);
 746         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 747
 748         return 0;
 749 }
 750
 751 /* The queue is ordered by time */
 752 static void __queue_event(struct sample_queue *new, struct perf_session *s)
 753 {
 754         struct ordered_samples *os = &s->ordered_samples;
 755         struct sample_queue *sample = os->last_sample;
 756         u64 timestamp = new->timestamp;
 757         struct list_head *p;
 758
 759         ++os->nr_samples;
 760         os->last_sample = new;
 761
 762         if (!sample) {
 763                 list_add(&new->list, &os->samples);
 764                 os->max_timestamp = timestamp;
 765                 return;
 766         }
 767
 768         /*
 769          * last_sample might point to some random place in the list as it's
 770          * the last queued event. We expect that the new event is close to
 771          * this.
 772          */
 773         if (sample->timestamp <= timestamp) {
 774                 while (sample->timestamp <= timestamp) {
 775                         p = sample->list.next;
 776                         if (p == &os->samples) {
 777                                 list_add_tail(&new->list, &os->samples);
 778                                 os->max_timestamp = timestamp;
 779                                 return;
 780                         }
 781                         sample = list_entry(p, struct sample_queue, list);
 782                 }
 783                 list_add_tail(&new->list, &sample->list);
 784         } else {
 785                 while (sample->timestamp > timestamp) {
 786                         p = sample->list.prev;
 787                         if (p == &os->samples) {
 788                                 list_add(&new->list, &os->samples);
 789                                 return;
 790                         }
 791                         sample = list_entry(p, struct sample_queue, list);
 792                 }
 793                 list_add(&new->list, &sample->list);
 794         }
 795 }
 796
 797 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
 798
 799 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 800                                     struct perf_sample *sample, u64 file_offset)
 801 {
 802         struct ordered_samples *os = &s->ordered_samples;
 803         struct list_head *sc = &os->sample_cache;
 804         u64 timestamp = sample->time;
 805         struct sample_queue *new;
 806
 807         if (!timestamp || timestamp == ~0ULL)
 808                 return -ETIME;
 809
 810         if (timestamp < s->ordered_samples.last_flush) {
 811                 printf("Warning: Timestamp below last timeslice flush\n");
 812                 return -EINVAL;
 813         }
 814
 815         if (!list_empty(sc)) {
 816                 new = list_entry(sc->next, struct sample_queue, list);
 817                 list_del(&new->list);
 818         } else if (os->sample_buffer) {
 819                 new = os->sample_buffer + os->sample_buffer_idx;
 820                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
 821                         os->sample_buffer = NULL;
 822         } else {
 823                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
 824                 if (!os->sample_buffer)
 825                         return -ENOMEM;
 826                 list_add(&os->sample_buffer->list, &os->to_free);
 827                 os->sample_buffer_idx = 2;
 828                 new = os->sample_buffer + 1;
 829         }
 830
 831         new->timestamp = timestamp;
 832         new->file_offset = file_offset;
 833         new->event = event;
 834
 835         __queue_event(new, s);
 836
 837         return 0;
 838 }
 839
 840 static void callchain__printf(struct perf_sample *sample)
 841 {
 842         unsigned int i;
 843
 844         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
 845
 846         for (i = 0; i < sample->callchain->nr; i++)
 847                 printf("..... %2d: %016" PRIx64 "\n",
 848                        i, sample->callchain->ips[i]);
 849 }
 850
 851 static void branch_stack__printf(struct perf_sample *sample)
 852 {
 853         uint64_t i;
 854
 855         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 856
 857         for (i = 0; i < sample->branch_stack->nr; i++)
 858                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
 859                         i, sample->branch_stack->entries[i].from,
 860                         sample->branch_stack->entries[i].to);
 861 }
 862
 863 static void perf_session__print_tstamp(struct perf_session *session,
 864                                        union perf_event *event,
 865                                        struct perf_sample *sample)
 866 {
 867         if (event->header.type != PERF_RECORD_SAMPLE &&
 868             !session->sample_id_all) {
 869                 fputs("-1 -1 ", stdout);
 870                 return;
 871         }
 872
 873         if ((session->sample_type & PERF_SAMPLE_CPU))
 874                 printf("%u ", sample->cpu);
 875
 876         if (session->sample_type & PERF_SAMPLE_TIME)
 877                 printf("%" PRIu64 " ", sample->time);
 878 }
 879
 880 static void dump_event(struct perf_session *session, union perf_event *event,
 881                        u64 file_offset, struct perf_sample *sample)
 882 {
 883         if (!dump_trace)
 884                 return;
 885
 886         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 887                file_offset, event->header.size, event->header.type);
 888
 889         trace_event(event);
 890
 891         if (sample)
 892                 perf_session__print_tstamp(session, event, sample);
 893
 894         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 895                event->header.size, perf_event__name(event->header.type));
 896 }
 897
 898 static void dump_sample(struct perf_session *session, union perf_event *event,
 899                         struct perf_sample *sample)
 900 {
 901         if (!dump_trace)
 902                 return;
 903
 904         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 905                event->header.misc, sample->pid, sample->tid, sample->ip,
 906                sample->period, sample->addr);
 907
 908         if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
 909                 callchain__printf(sample);
 910
 911         if (session->sample_type & PERF_SAMPLE_BRANCH_STACK)
 912                 branch_stack__printf(sample);
 913 }
 914
 915 static struct machine *
 916         perf_session__find_machine_for_cpumode(struct perf_session *session,
 917                                                union perf_event *event)
 918 {
 919         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 920
 921         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 922                 u32 pid;
 923
 924                 if (event->header.type == PERF_RECORD_MMAP)
 925                         pid = event->mmap.pid;
 926                 else
 927                         pid = event->ip.pid;
 928
 929                 return perf_session__find_machine(session, pid);
 930         }
 931
 932         return perf_session__find_host_machine(session);
 933 }
 934
 935 static int perf_session_deliver_event(struct perf_session *session,
 936                                       union perf_event *event,
 937                                       struct perf_sample *sample,
 938                                       struct perf_tool *tool,
 939                                       u64 file_offset)
 940 {
 941         struct perf_evsel *evsel;
 942         struct machine *machine;
 943
 944         dump_event(session, event, file_offset, sample);
 945
 946         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 947         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
 948                 /*
 949                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
 950                  * because the tools right now may apply filters, discarding
 951                  * some of the samples. For consistency, in the future we
 952                  * should have something like nr_filtered_samples and remove
 953                  * the sample->period from total_sample_period, etc, KISS for
 954                  * now tho.
 955                  *
 956                  * Also testing against NULL allows us to handle files without
 957                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
 958                  * future probably it'll be a good idea to restrict event
 959                  * processing via perf_session to files with both set.
 960                  */
 961                 hists__inc_nr_events(&evsel->hists, event->header.type);
 962         }
 963
 964         machine = perf_session__find_machine_for_cpumode(session, event);
 965
 966         switch (event->header.type) {
 967         case PERF_RECORD_SAMPLE:
 968                 dump_sample(session, event, sample);
 969                 if (evsel == NULL) {
 970                         ++session->hists.stats.nr_unknown_id;
 971                         return 0;
 972                 }
 973                 if (machine == NULL) {
 974                         ++session->hists.stats.nr_unprocessable_samples;
 975                         return 0;
 976                 }
 977                 return tool->sample(tool, event, sample, evsel, machine);
 978         case PERF_RECORD_MMAP:
 979                 return tool->mmap(tool, event, sample, machine);
 980         case PERF_RECORD_COMM:
 981                 return tool->comm(tool, event, sample, machine);
 982         case PERF_RECORD_FORK:
 983                 return tool->fork(tool, event, sample, machine);
 984         case PERF_RECORD_EXIT:
 985                 return tool->exit(tool, event, sample, machine);
 986         case PERF_RECORD_LOST:
 987                 if (tool->lost == perf_event__process_lost)
 988                         session->hists.stats.total_lost += event->lost.lost;
 989                 return tool->lost(tool, event, sample, machine);
 990         case PERF_RECORD_READ:
 991                 return tool->read(tool, event, sample, evsel, machine);
 992         case PERF_RECORD_THROTTLE:
 993                 return tool->throttle(tool, event, sample, machine);
 994         case PERF_RECORD_UNTHROTTLE:
 995                 return tool->unthrottle(tool, event, sample, machine);
 996         default:
 997                 ++session->hists.stats.nr_unknown_events;
 998                 return -1;
 999         }
1000 }
1001
1002 static int perf_session__preprocess_sample(struct perf_session *session,
1003                                            union perf_event *event, struct perf_sample *sample)
1004 {
1005         if (event->header.type != PERF_RECORD_SAMPLE ||
1006             !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
1007                 return 0;
1008
1009         if (!ip_callchain__valid(sample->callchain, event)) {
1010                 pr_debug("call-chain problem with event, skipping it.\n");
1011                 ++session->hists.stats.nr_invalid_chains;
1012                 session->hists.stats.total_invalid_chains += sample->period;
1013                 return -EINVAL;
1014         }
1015         return 0;
1016 }
1017
1018 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
1019                                             struct perf_tool *tool, u64 file_offset)
1020 {
1021         int err;
1022
1023         dump_event(session, event, file_offset, NULL);
1024
1025         /* These events are processed right away */
1026         switch (event->header.type) {
1027         case PERF_RECORD_HEADER_ATTR:
1028                 err = tool->attr(event, &session->evlist);
1029                 if (err == 0)
1030                         perf_session__update_sample_type(session);
1031                 return err;
1032         case PERF_RECORD_HEADER_EVENT_TYPE:
1033                 return tool->event_type(tool, event);
1034         case PERF_RECORD_HEADER_TRACING_DATA:
1035                 /* setup for reading amidst mmap */
1036                 lseek(session->fd, file_offset, SEEK_SET);
1037                 return tool->tracing_data(event, session);
1038         case PERF_RECORD_HEADER_BUILD_ID:
1039                 return tool->build_id(tool, event, session);
1040         case PERF_RECORD_FINISHED_ROUND:
1041                 return tool->finished_round(tool, event, session);
1042         default:
1043                 return -EINVAL;
1044         }
1045 }
1046
1047 static void event_swap(union perf_event *event, bool sample_id_all)
1048 {
1049         perf_event__swap_op swap;
1050
1051         swap = perf_event__swap_ops[event->header.type];
1052         if (swap)
1053                 swap(event, sample_id_all);
1054 }
1055
1056 static int perf_session__process_event(struct perf_session *session,
1057                                        union perf_event *event,
1058                                        struct perf_tool *tool,
1059                                        u64 file_offset)
1060 {
1061         struct perf_sample sample;
1062         int ret;
1063
1064         if (session->header.needs_swap)
1065                 event_swap(event, session->sample_id_all);
1066
1067         if (event->header.type >= PERF_RECORD_HEADER_MAX)
1068                 return -EINVAL;
1069
1070         hists__inc_nr_events(&session->hists, event->header.type);
1071
1072         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1073                 return perf_session__process_user_event(session, event, tool, file_offset);
1074
1075         /*
1076          * For all kernel events we get the sample data
1077          */
1078         ret = perf_session__parse_sample(session, event, &sample);
1079         if (ret)
1080                 return ret;
1081
1082         /* Preprocess sample records - precheck callchains */
1083         if (perf_session__preprocess_sample(session, event, &sample))
1084                 return 0;
1085
1086         if (tool->ordered_samples) {
1087                 ret = perf_session_queue_event(session, event, &sample,
1088                                                file_offset);
1089                 if (ret != -ETIME)
1090                         return ret;
1091         }
1092
1093         return perf_session_deliver_event(session, event, &sample, tool,
1094                                           file_offset);
1095 }
1096
1097 void perf_event_header__bswap(struct perf_event_header *self)
1098 {
1099         self->type = bswap_32(self->type);
1100         self->misc = bswap_16(self->misc);
1101         self->size = bswap_16(self->size);
1102 }
1103
1104 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
1105 {
1106         return machine__findnew_thread(&session->host_machine, pid);
1107 }
1108
1109 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1110 {
1111         struct thread *thread = perf_session__findnew(self, 0);
1112
1113         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1114                 pr_err("problem inserting idle task.\n");
1115                 thread = NULL;
1116         }
1117
1118         return thread;
1119 }
1120
1121 static void perf_session__warn_about_errors(const struct perf_session *session,
1122                                             const struct perf_tool *tool)
1123 {
1124         if (tool->lost == perf_event__process_lost &&
1125             session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
1126                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1127                             "Check IO/CPU overload!\n\n",
1128                             session->hists.stats.nr_events[0],
1129                             session->hists.stats.nr_events[PERF_RECORD_LOST]);
1130         }
1131
1132         if (session->hists.stats.nr_unknown_events != 0) {
1133                 ui__warning("Found %u unknown events!\n\n"
1134                             "Is this an older tool processing a perf.data "
1135                             "file generated by a more recent tool?\n\n"
1136                             "If that is not the case, consider "
1137                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1138                             session->hists.stats.nr_unknown_events);
1139         }
1140
1141         if (session->hists.stats.nr_unknown_id != 0) {
1142                 ui__warning("%u samples with id not present in the header\n",
1143                             session->hists.stats.nr_unknown_id);
1144         }
1145
1146         if (session->hists.stats.nr_invalid_chains != 0) {
1147                 ui__warning("Found invalid callchains!\n\n"
1148                             "%u out of %u events were discarded for this reason.\n\n"
1149                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1150                             session->hists.stats.nr_invalid_chains,
1151                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
1152         }
1153
1154         if (session->hists.stats.nr_unprocessable_samples != 0) {
1155                 ui__warning("%u unprocessable samples recorded.\n"
1156                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1157                             session->hists.stats.nr_unprocessable_samples);
1158         }
1159 }
1160
1161 #define session_done()  (*(volatile int *)(&session_done))
1162 volatile int session_done;
1163
1164 static int __perf_session__process_pipe_events(struct perf_session *self,
1165                                                struct perf_tool *tool)
1166 {
1167         union perf_event *event;
1168         uint32_t size, cur_size = 0;
1169         void *buf = NULL;
1170         int skip = 0;
1171         u64 head;
1172         int err;
1173         void *p;
1174
1175         perf_tool__fill_defaults(tool);
1176
1177         head = 0;
1178         cur_size = sizeof(union perf_event);
1179
1180         buf = malloc(cur_size);
1181         if (!buf)
1182                 return -errno;
1183 more:
1184         event = buf;
1185         err = readn(self->fd, event, sizeof(struct perf_event_header));
1186         if (err <= 0) {
1187                 if (err == 0)
1188                         goto done;
1189
1190                 pr_err("failed to read event header\n");
1191                 goto out_err;
1192         }
1193
1194         if (self->header.needs_swap)
1195                 perf_event_header__bswap(&event->header);
1196
1197         size = event->header.size;
1198         if (size == 0)
1199                 size = 8;
1200
1201         if (size > cur_size) {
1202                 void *new = realloc(buf, size);
1203                 if (!new) {
1204                         pr_err("failed to allocate memory to read event\n");
1205                         goto out_err;
1206                 }
1207                 buf = new;
1208                 cur_size = size;
1209                 event = buf;
1210         }
1211         p = event;
1212         p += sizeof(struct perf_event_header);
1213
1214         if (size - sizeof(struct perf_event_header)) {
1215                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1216                 if (err <= 0) {
1217                         if (err == 0) {
1218                                 pr_err("unexpected end of event stream\n");
1219                                 goto done;
1220                         }
1221
1222                         pr_err("failed to read event data\n");
1223                         goto out_err;
1224                 }
1225         }
1226
1227         if ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
1228                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1229                        head, event->header.size, event->header.type);
1230                 err = -EINVAL;
1231                 goto out_err;
1232         }
1233
1234         head += size;
1235
1236         if (skip > 0)
1237                 head += skip;
1238
1239         if (!session_done())
1240                 goto more;
1241 done:
1242         err = 0;
1243 out_err:
1244         free(buf);
1245         perf_session__warn_about_errors(self, tool);
1246         perf_session_free_sample_buffers(self);
1247         return err;
1248 }
1249
1250 static union perf_event *
1251 fetch_mmaped_event(struct perf_session *session,
1252                    u64 head, size_t mmap_size, char *buf)
1253 {
1254         union perf_event *event;
1255
1256         /*
1257          * Ensure we have enough space remaining to read
1258          * the size of the event in the headers.
1259          */
1260         if (head + sizeof(event->header) > mmap_size)
1261                 return NULL;
1262
1263         event = (union perf_event *)(buf + head);
1264
1265         if (session->header.needs_swap)
1266                 perf_event_header__bswap(&event->header);
1267
1268         if (head + event->header.size > mmap_size)
1269                 return NULL;
1270
1271         return event;
1272 }
1273
1274 int __perf_session__process_events(struct perf_session *session,
1275                                    u64 data_offset, u64 data_size,
1276                                    u64 file_size, struct perf_tool *tool)
1277 {
1278         u64 head, page_offset, file_offset, file_pos, progress_next;
1279         int err, mmap_prot, mmap_flags, map_idx = 0;
1280         size_t  page_size, mmap_size;
1281         char *buf, *mmaps[8];
1282         union perf_event *event;
1283         uint32_t size;
1284
1285         perf_tool__fill_defaults(tool);
1286
1287         page_size = sysconf(_SC_PAGESIZE);
1288
1289         page_offset = page_size * (data_offset / page_size);
1290         file_offset = page_offset;
1291         head = data_offset - page_offset;
1292
1293         if (data_offset + data_size < file_size)
1294                 file_size = data_offset + data_size;
1295
1296         progress_next = file_size / 16;
1297
1298         mmap_size = session->mmap_window;
1299         if (mmap_size > file_size)
1300                 mmap_size = file_size;
1301
1302         memset(mmaps, 0, sizeof(mmaps));
1303
1304         mmap_prot  = PROT_READ;
1305         mmap_flags = MAP_SHARED;
1306
1307         if (session->header.needs_swap) {
1308                 mmap_prot  |= PROT_WRITE;
1309                 mmap_flags = MAP_PRIVATE;
1310         }
1311 remap:
1312         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1313                    file_offset);
1314         if (buf == MAP_FAILED) {
1315                 pr_err("failed to mmap file\n");
1316                 err = -errno;
1317                 goto out_err;
1318         }
1319         mmaps[map_idx] = buf;
1320         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1321         file_pos = file_offset + head;
1322
1323 more:
1324         event = fetch_mmaped_event(session, head, mmap_size, buf);
1325         if (!event) {
1326                 if (mmaps[map_idx]) {
1327                         munmap(mmaps[map_idx], mmap_size);
1328                         mmaps[map_idx] = NULL;
1329                 }
1330
1331                 page_offset = page_size * (head / page_size);
1332                 file_offset += page_offset;
1333                 head -= page_offset;
1334                 goto remap;
1335         }
1336
1337         size = event->header.size;
1338
1339         if (size == 0 ||
1340             perf_session__process_event(session, event, tool, file_pos) < 0) {
1341                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1342                        file_offset + head, event->header.size,
1343                        event->header.type);
1344                 err = -EINVAL;
1345                 goto out_err;
1346         }
1347
1348         head += size;
1349         file_pos += size;
1350
1351         if (file_pos >= progress_next) {
1352                 progress_next += file_size / 16;
1353                 ui_progress__update(file_pos, file_size,
1354                                     "Processing events...");
1355         }
1356
1357         if (file_pos < file_size)
1358                 goto more;
1359
1360         err = 0;
1361         /* do the final flush for ordered samples */
1362         session->ordered_samples.next_flush = ULLONG_MAX;
1363         flush_sample_queue(session, tool);
1364 out_err:
1365         perf_session__warn_about_errors(session, tool);
1366         perf_session_free_sample_buffers(session);
1367         return err;
1368 }
1369
1370 int perf_session__process_events(struct perf_session *self,
1371                                  struct perf_tool *tool)
1372 {
1373         int err;
1374
1375         if (perf_session__register_idle_thread(self) == NULL)
1376                 return -ENOMEM;
1377
1378         if (!self->fd_pipe)
1379                 err = __perf_session__process_events(self,
1380                                                      self->header.data_offset,
1381                                                      self->header.data_size,
1382                                                      self->size, tool);
1383         else
1384                 err = __perf_session__process_pipe_events(self, tool);
1385
1386         return err;
1387 }
1388
1389 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1390 {
1391         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1392                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1393                 return false;
1394         }
1395
1396         return true;
1397 }
1398
1399 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1400                                      const char *symbol_name, u64 addr)
1401 {
1402         char *bracket;
1403         enum map_type i;
1404         struct ref_reloc_sym *ref;
1405
1406         ref = zalloc(sizeof(struct ref_reloc_sym));
1407         if (ref == NULL)
1408                 return -ENOMEM;
1409
1410         ref->name = strdup(symbol_name);
1411         if (ref->name == NULL) {
1412                 free(ref);
1413                 return -ENOMEM;
1414         }
1415
1416         bracket = strchr(ref->name, ']');
1417         if (bracket)
1418                 *bracket = '\0';
1419
1420         ref->addr = addr;
1421
1422         for (i = 0; i < MAP__NR_TYPES; ++i) {
1423                 struct kmap *kmap = map__kmap(maps[i]);
1424                 kmap->ref_reloc_sym = ref;
1425         }
1426
1427         return 0;
1428 }
1429
1430 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1431 {
1432         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1433                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1434                machines__fprintf_dsos(&self->machines, fp);
1435 }
1436
1437 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1438                                           bool with_hits)
1439 {
1440         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1441         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1442 }
1443
1444 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1445 {
1446         struct perf_evsel *pos;
1447         size_t ret = fprintf(fp, "Aggregated stats:\n");
1448
1449         ret += hists__fprintf_nr_events(&session->hists, fp);
1450
1451         list_for_each_entry(pos, &session->evlist->entries, node) {
1452                 ret += fprintf(fp, "%s stats:\n", event_name(pos));
1453                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1454         }
1455
1456         return ret;
1457 }
1458
1459 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1460 {
1461         /*
1462          * FIXME: Here we have to actually print all the machines in this
1463          * session, not just the host...
1464          */
1465         return machine__fprintf(&session->host_machine, fp);
1466 }
1467
1468 void perf_session__remove_thread(struct perf_session *session,
1469                                  struct thread *th)
1470 {
1471         /*
1472          * FIXME: This one makes no sense, we need to remove the thread from
1473          * the machine it belongs to, perf_session can have many machines, so
1474          * doing it always on ->host_machine is wrong.  Fix when auditing all
1475          * the 'perf kvm' code.
1476          */
1477         machine__remove_thread(&session->host_machine, th);
1478 }
1479
1480 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1481                                               unsigned int type)
1482 {
1483         struct perf_evsel *pos;
1484
1485         list_for_each_entry(pos, &session->evlist->entries, node) {
1486                 if (pos->attr.type == type)
1487                         return pos;
1488         }
1489         return NULL;
1490 }
1491
1492 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1493                           struct machine *machine, struct perf_evsel *evsel,
1494                           int print_sym, int print_dso, int print_symoffset)
1495 {
1496         struct addr_location al;
1497         struct callchain_cursor_node *node;
1498
1499         if (perf_event__preprocess_sample(event, machine, &al, sample,
1500                                           NULL) < 0) {
1501                 error("problem processing %d event, skipping it.\n",
1502                         event->header.type);
1503                 return;
1504         }
1505
1506         if (symbol_conf.use_callchain && sample->callchain) {
1507
1508                 if (machine__resolve_callchain(machine, evsel, al.thread,
1509                                                 sample->callchain, NULL) != 0) {
1510                         if (verbose)
1511                                 error("Failed to resolve callchain. Skipping\n");
1512                         return;
1513                 }
1514                 callchain_cursor_commit(&callchain_cursor);
1515
1516                 while (1) {
1517                         node = callchain_cursor_current(&callchain_cursor);
1518                         if (!node)
1519                                 break;
1520
1521                         printf("\t%16" PRIx64, node->ip);
1522                         if (print_sym) {
1523                                 printf(" ");
1524                                 symbol__fprintf_symname(node->sym, stdout);
1525                         }
1526                         if (print_dso) {
1527                                 printf(" (");
1528                                 map__fprintf_dsoname(node->map, stdout);
1529                                 printf(")");
1530                         }
1531                         printf("\n");
1532
1533                         callchain_cursor_advance(&callchain_cursor);
1534                 }
1535
1536         } else {
1537                 printf("%16" PRIx64, sample->ip);
1538                 if (print_sym) {
1539                         printf(" ");
1540                         if (print_symoffset)
1541                                 symbol__fprintf_symname_offs(al.sym, &al,
1542                                                              stdout);
1543                         else
1544                                 symbol__fprintf_symname(al.sym, stdout);
1545                 }
1546
1547                 if (print_dso) {
1548                         printf(" (");
1549                         map__fprintf_dsoname(al.map, stdout);
1550                         printf(")");
1551                 }
1552         }
1553 }
1554
1555 int perf_session__cpu_bitmap(struct perf_session *session,
1556                              const char *cpu_list, unsigned long *cpu_bitmap)
1557 {
1558         int i;
1559         struct cpu_map *map;
1560
1561         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1562                 struct perf_evsel *evsel;
1563
1564                 evsel = perf_session__find_first_evtype(session, i);
1565                 if (!evsel)
1566                         continue;
1567
1568                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1569                         pr_err("File does not contain CPU events. "
1570                                "Remove -c option to proceed.\n");
1571                         return -1;
1572                 }
1573         }
1574
1575         map = cpu_map__new(cpu_list);
1576         if (map == NULL) {
1577                 pr_err("Invalid cpu_list\n");
1578                 return -1;
1579         }
1580
1581         for (i = 0; i < map->nr; i++) {
1582                 int cpu = map->map[i];
1583
1584                 if (cpu >= MAX_NR_CPUS) {
1585                         pr_err("Requested CPU %d too large. "
1586                                "Consider raising MAX_NR_CPUS\n", cpu);
1587                         return -1;
1588                 }
1589
1590                 set_bit(cpu, cpu_bitmap);
1591         }
1592
1593         return 0;
1594 }
1595
1596 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1597                                 bool full)
1598 {
1599         struct stat st;
1600         int ret;
1601
1602         if (session == NULL || fp == NULL)
1603                 return;
1604
1605         ret = fstat(session->fd, &st);
1606         if (ret == -1)
1607                 return;
1608
1609         fprintf(fp, "# ========\n");
1610         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1611         perf_header__fprintf_info(session, fp, full);
1612         fprintf(fp, "# ========\n#\n");
1613 }