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 #include "event-parse.h"
  18
  19 static int perf_session__open(struct perf_session *self, bool force)
  20 {
  21         struct stat input_stat;
  22
  23         if (!strcmp(self->filename, "-")) {
  24                 self->fd_pipe = true;
  25                 self->fd = STDIN_FILENO;
  26
  27                 if (perf_session__read_header(self, self->fd) < 0)
  28                         pr_err("incompatible file format (rerun with -v to learn more)");
  29
  30                 return 0;
  31         }
  32
  33         self->fd = open(self->filename, O_RDONLY);
  34         if (self->fd < 0) {
  35                 int err = errno;
  36
  37                 pr_err("failed to open %s: %s", self->filename, strerror(err));
  38                 if (err == ENOENT && !strcmp(self->filename, "perf.data"))
  39                         pr_err("  (try 'perf record' first)");
  40                 pr_err("\n");
  41                 return -errno;
  42         }
  43
  44         if (fstat(self->fd, &input_stat) < 0)
  45                 goto out_close;
  46
  47         if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
  48                 pr_err("file %s not owned by current user or root\n",
  49                        self->filename);
  50                 goto out_close;
  51         }
  52
  53         if (!input_stat.st_size) {
  54                 pr_info("zero-sized file (%s), nothing to do!\n",
  55                         self->filename);
  56                 goto out_close;
  57         }
  58
  59         if (perf_session__read_header(self, self->fd) < 0) {
  60                 pr_err("incompatible file format (rerun with -v to learn more)");
  61                 goto out_close;
  62         }
  63
  64         if (!perf_evlist__valid_sample_type(self->evlist)) {
  65                 pr_err("non matching sample_type");
  66                 goto out_close;
  67         }
  68
  69         if (!perf_evlist__valid_sample_id_all(self->evlist)) {
  70                 pr_err("non matching sample_id_all");
  71                 goto out_close;
  72         }
  73
  74         self->size = input_stat.st_size;
  75         return 0;
  76
  77 out_close:
  78         close(self->fd);
  79         self->fd = -1;
  80         return -1;
  81 }
  82
  83 void perf_session__set_id_hdr_size(struct perf_session *session)
  84 {
  85         u16 id_hdr_size = perf_evlist__id_hdr_size(session->evlist);
  86
  87         session->host_machine.id_hdr_size = id_hdr_size;
  88         machines__set_id_hdr_size(&session->machines, 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__set_id_hdr_size(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 && !perf_evlist__sample_id_all(self->evlist)) {
 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 thread *thread,
 293                                struct ip_callchain *chain,
 294                                struct symbol **parent)
 295 {
 296         u8 cpumode = PERF_RECORD_MISC_USER;
 297         unsigned int i;
 298         int err;
 299
 300         callchain_cursor_reset(&callchain_cursor);
 301
 302         if (chain->nr > PERF_MAX_STACK_DEPTH) {
 303                 pr_warning("corrupted callchain. skipping...\n");
 304                 return 0;
 305         }
 306
 307         for (i = 0; i < chain->nr; i++) {
 308                 u64 ip;
 309                 struct addr_location al;
 310
 311                 if (callchain_param.order == ORDER_CALLEE)
 312                         ip = chain->ips[i];
 313                 else
 314                         ip = chain->ips[chain->nr - i - 1];
 315
 316                 if (ip >= PERF_CONTEXT_MAX) {
 317                         switch (ip) {
 318                         case PERF_CONTEXT_HV:
 319                                 cpumode = PERF_RECORD_MISC_HYPERVISOR;  break;
 320                         case PERF_CONTEXT_KERNEL:
 321                                 cpumode = PERF_RECORD_MISC_KERNEL;      break;
 322                         case PERF_CONTEXT_USER:
 323                                 cpumode = PERF_RECORD_MISC_USER;        break;
 324                         default:
 325                                 pr_debug("invalid callchain context: "
 326                                          "%"PRId64"\n", (s64) ip);
 327                                 /*
 328                                  * It seems the callchain is corrupted.
 329                                  * Discard all.
 330                                  */
 331                                 callchain_cursor_reset(&callchain_cursor);
 332                                 return 0;
 333                         }
 334                         continue;
 335                 }
 336
 337                 al.filtered = false;
 338                 thread__find_addr_location(thread, self, cpumode,
 339                                            MAP__FUNCTION, ip, &al, NULL);
 340                 if (al.sym != NULL) {
 341                         if (sort__has_parent && !*parent &&
 342                             symbol__match_parent_regex(al.sym))
 343                                 *parent = al.sym;
 344                         if (!symbol_conf.use_callchain)
 345                                 break;
 346                 }
 347
 348                 err = callchain_cursor_append(&callchain_cursor,
 349                                               ip, al.map, al.sym);
 350                 if (err)
 351                         return err;
 352         }
 353
 354         return 0;
 355 }
 356
 357 static int process_event_synth_tracing_data_stub(union perf_event *event __used,
 358                                                  struct perf_session *session __used)
 359 {
 360         dump_printf(": unhandled!\n");
 361         return 0;
 362 }
 363
 364 static int process_event_synth_attr_stub(union perf_event *event __used,
 365                                          struct perf_evlist **pevlist __used)
 366 {
 367         dump_printf(": unhandled!\n");
 368         return 0;
 369 }
 370
 371 static int process_event_sample_stub(struct perf_tool *tool __used,
 372                                      union perf_event *event __used,
 373                                      struct perf_sample *sample __used,
 374                                      struct perf_evsel *evsel __used,
 375                                      struct machine *machine __used)
 376 {
 377         dump_printf(": unhandled!\n");
 378         return 0;
 379 }
 380
 381 static int process_event_stub(struct perf_tool *tool __used,
 382                               union perf_event *event __used,
 383                               struct perf_sample *sample __used,
 384                               struct machine *machine __used)
 385 {
 386         dump_printf(": unhandled!\n");
 387         return 0;
 388 }
 389
 390 static int process_finished_round_stub(struct perf_tool *tool __used,
 391                                        union perf_event *event __used,
 392                                        struct perf_session *perf_session __used)
 393 {
 394         dump_printf(": unhandled!\n");
 395         return 0;
 396 }
 397
 398 static int process_event_type_stub(struct perf_tool *tool __used,
 399                                    union perf_event *event __used)
 400 {
 401         dump_printf(": unhandled!\n");
 402         return 0;
 403 }
 404
 405 static int process_finished_round(struct perf_tool *tool,
 406                                   union perf_event *event,
 407                                   struct perf_session *session);
 408
 409 static void perf_tool__fill_defaults(struct perf_tool *tool)
 410 {
 411         if (tool->sample == NULL)
 412                 tool->sample = process_event_sample_stub;
 413         if (tool->mmap == NULL)
 414                 tool->mmap = process_event_stub;
 415         if (tool->comm == NULL)
 416                 tool->comm = process_event_stub;
 417         if (tool->fork == NULL)
 418                 tool->fork = process_event_stub;
 419         if (tool->exit == NULL)
 420                 tool->exit = process_event_stub;
 421         if (tool->lost == NULL)
 422                 tool->lost = perf_event__process_lost;
 423         if (tool->read == NULL)
 424                 tool->read = process_event_sample_stub;
 425         if (tool->throttle == NULL)
 426                 tool->throttle = process_event_stub;
 427         if (tool->unthrottle == NULL)
 428                 tool->unthrottle = process_event_stub;
 429         if (tool->attr == NULL)
 430                 tool->attr = process_event_synth_attr_stub;
 431         if (tool->event_type == NULL)
 432                 tool->event_type = process_event_type_stub;
 433         if (tool->tracing_data == NULL)
 434                 tool->tracing_data = process_event_synth_tracing_data_stub;
 435         if (tool->build_id == NULL)
 436                 tool->build_id = process_finished_round_stub;
 437         if (tool->finished_round == NULL) {
 438                 if (tool->ordered_samples)
 439                         tool->finished_round = process_finished_round;
 440                 else
 441                         tool->finished_round = process_finished_round_stub;
 442         }
 443 }
 444
 445 void mem_bswap_32(void *src, int byte_size)
 446 {
 447         u32 *m = src;
 448         while (byte_size > 0) {
 449                 *m = bswap_32(*m);
 450                 byte_size -= sizeof(u32);
 451                 ++m;
 452         }
 453 }
 454
 455 void mem_bswap_64(void *src, int byte_size)
 456 {
 457         u64 *m = src;
 458
 459         while (byte_size > 0) {
 460                 *m = bswap_64(*m);
 461                 byte_size -= sizeof(u64);
 462                 ++m;
 463         }
 464 }
 465
 466 static void swap_sample_id_all(union perf_event *event, void *data)
 467 {
 468         void *end = (void *) event + event->header.size;
 469         int size = end - data;
 470
 471         BUG_ON(size % sizeof(u64));
 472         mem_bswap_64(data, size);
 473 }
 474
 475 static void perf_event__all64_swap(union perf_event *event,
 476                                    bool sample_id_all __used)
 477 {
 478         struct perf_event_header *hdr = &event->header;
 479         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 480 }
 481
 482 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 483 {
 484         event->comm.pid = bswap_32(event->comm.pid);
 485         event->comm.tid = bswap_32(event->comm.tid);
 486
 487         if (sample_id_all) {
 488                 void *data = &event->comm.comm;
 489
 490                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 491                 swap_sample_id_all(event, data);
 492         }
 493 }
 494
 495 static void perf_event__mmap_swap(union perf_event *event,
 496                                   bool sample_id_all)
 497 {
 498         event->mmap.pid   = bswap_32(event->mmap.pid);
 499         event->mmap.tid   = bswap_32(event->mmap.tid);
 500         event->mmap.start = bswap_64(event->mmap.start);
 501         event->mmap.len   = bswap_64(event->mmap.len);
 502         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 503
 504         if (sample_id_all) {
 505                 void *data = &event->mmap.filename;
 506
 507                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 508                 swap_sample_id_all(event, data);
 509         }
 510 }
 511
 512 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 513 {
 514         event->fork.pid  = bswap_32(event->fork.pid);
 515         event->fork.tid  = bswap_32(event->fork.tid);
 516         event->fork.ppid = bswap_32(event->fork.ppid);
 517         event->fork.ptid = bswap_32(event->fork.ptid);
 518         event->fork.time = bswap_64(event->fork.time);
 519
 520         if (sample_id_all)
 521                 swap_sample_id_all(event, &event->fork + 1);
 522 }
 523
 524 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 525 {
 526         event->read.pid          = bswap_32(event->read.pid);
 527         event->read.tid          = bswap_32(event->read.tid);
 528         event->read.value        = bswap_64(event->read.value);
 529         event->read.time_enabled = bswap_64(event->read.time_enabled);
 530         event->read.time_running = bswap_64(event->read.time_running);
 531         event->read.id           = bswap_64(event->read.id);
 532
 533         if (sample_id_all)
 534                 swap_sample_id_all(event, &event->read + 1);
 535 }
 536
 537 static u8 revbyte(u8 b)
 538 {
 539         int rev = (b >> 4) | ((b & 0xf) << 4);
 540         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
 541         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
 542         return (u8) rev;
 543 }
 544
 545 /*
 546  * XXX this is hack in attempt to carry flags bitfield
 547  * throught endian village. ABI says:
 548  *
 549  * Bit-fields are allocated from right to left (least to most significant)
 550  * on little-endian implementations and from left to right (most to least
 551  * significant) on big-endian implementations.
 552  *
 553  * The above seems to be byte specific, so we need to reverse each
 554  * byte of the bitfield. 'Internet' also says this might be implementation
 555  * specific and we probably need proper fix and carry perf_event_attr
 556  * bitfield flags in separate data file FEAT_ section. Thought this seems
 557  * to work for now.
 558  */
 559 static void swap_bitfield(u8 *p, unsigned len)
 560 {
 561         unsigned i;
 562
 563         for (i = 0; i < len; i++) {
 564                 *p = revbyte(*p);
 565                 p++;
 566         }
 567 }
 568
 569 /* exported for swapping attributes in file header */
 570 void perf_event__attr_swap(struct perf_event_attr *attr)
 571 {
 572         attr->type              = bswap_32(attr->type);
 573         attr->size              = bswap_32(attr->size);
 574         attr->config            = bswap_64(attr->config);
 575         attr->sample_period     = bswap_64(attr->sample_period);
 576         attr->sample_type       = bswap_64(attr->sample_type);
 577         attr->read_format       = bswap_64(attr->read_format);
 578         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 579         attr->bp_type           = bswap_32(attr->bp_type);
 580         attr->bp_addr           = bswap_64(attr->bp_addr);
 581         attr->bp_len            = bswap_64(attr->bp_len);
 582
 583         swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
 584 }
 585
 586 static void perf_event__hdr_attr_swap(union perf_event *event,
 587                                       bool sample_id_all __used)
 588 {
 589         size_t size;
 590
 591         perf_event__attr_swap(&event->attr.attr);
 592
 593         size = event->header.size;
 594         size -= (void *)&event->attr.id - (void *)event;
 595         mem_bswap_64(event->attr.id, size);
 596 }
 597
 598 static void perf_event__event_type_swap(union perf_event *event,
 599                                         bool sample_id_all __used)
 600 {
 601         event->event_type.event_type.event_id =
 602                 bswap_64(event->event_type.event_type.event_id);
 603 }
 604
 605 static void perf_event__tracing_data_swap(union perf_event *event,
 606                                           bool sample_id_all __used)
 607 {
 608         event->tracing_data.size = bswap_32(event->tracing_data.size);
 609 }
 610
 611 typedef void (*perf_event__swap_op)(union perf_event *event,
 612                                     bool sample_id_all);
 613
 614 static perf_event__swap_op perf_event__swap_ops[] = {
 615         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 616         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 617         [PERF_RECORD_FORK]                = perf_event__task_swap,
 618         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 619         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 620         [PERF_RECORD_READ]                = perf_event__read_swap,
 621         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 622         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 623         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 624         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 625         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 626         [PERF_RECORD_HEADER_MAX]          = NULL,
 627 };
 628
 629 struct sample_queue {
 630         u64                     timestamp;
 631         u64                     file_offset;
 632         union perf_event        *event;
 633         struct list_head        list;
 634 };
 635
 636 static void perf_session_free_sample_buffers(struct perf_session *session)
 637 {
 638         struct ordered_samples *os = &session->ordered_samples;
 639
 640         while (!list_empty(&os->to_free)) {
 641                 struct sample_queue *sq;
 642
 643                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 644                 list_del(&sq->list);
 645                 free(sq);
 646         }
 647 }
 648
 649 static int perf_session_deliver_event(struct perf_session *session,
 650                                       union perf_event *event,
 651                                       struct perf_sample *sample,
 652                                       struct perf_tool *tool,
 653                                       u64 file_offset);
 654
 655 static void flush_sample_queue(struct perf_session *s,
 656                                struct perf_tool *tool)
 657 {
 658         struct ordered_samples *os = &s->ordered_samples;
 659         struct list_head *head = &os->samples;
 660         struct sample_queue *tmp, *iter;
 661         struct perf_sample sample;
 662         u64 limit = os->next_flush;
 663         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 664         unsigned idx = 0, progress_next = os->nr_samples / 16;
 665         int ret;
 666
 667         if (!tool->ordered_samples || !limit)
 668                 return;
 669
 670         list_for_each_entry_safe(iter, tmp, head, list) {
 671                 if (iter->timestamp > limit)
 672                         break;
 673
 674                 ret = perf_evlist__parse_sample(s->evlist, iter->event, &sample,
 675                                                 s->header.needs_swap);
 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         u64 sample_type = perf_evlist__sample_type(session->evlist);
 868
 869         if (event->header.type != PERF_RECORD_SAMPLE &&
 870             !perf_evlist__sample_id_all(session->evlist)) {
 871                 fputs("-1 -1 ", stdout);
 872                 return;
 873         }
 874
 875         if ((sample_type & PERF_SAMPLE_CPU))
 876                 printf("%u ", sample->cpu);
 877
 878         if (sample_type & PERF_SAMPLE_TIME)
 879                 printf("%" PRIu64 " ", sample->time);
 880 }
 881
 882 static void dump_event(struct perf_session *session, union perf_event *event,
 883                        u64 file_offset, struct perf_sample *sample)
 884 {
 885         if (!dump_trace)
 886                 return;
 887
 888         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 889                file_offset, event->header.size, event->header.type);
 890
 891         trace_event(event);
 892
 893         if (sample)
 894                 perf_session__print_tstamp(session, event, sample);
 895
 896         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 897                event->header.size, perf_event__name(event->header.type));
 898 }
 899
 900 static void dump_sample(struct perf_session *session, union perf_event *event,
 901                         struct perf_sample *sample)
 902 {
 903         u64 sample_type;
 904
 905         if (!dump_trace)
 906                 return;
 907
 908         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 909                event->header.misc, sample->pid, sample->tid, sample->ip,
 910                sample->period, sample->addr);
 911
 912         sample_type = perf_evlist__sample_type(session->evlist);
 913
 914         if (sample_type & PERF_SAMPLE_CALLCHAIN)
 915                 callchain__printf(sample);
 916
 917         if (sample_type & PERF_SAMPLE_BRANCH_STACK)
 918                 branch_stack__printf(sample);
 919 }
 920
 921 static struct machine *
 922         perf_session__find_machine_for_cpumode(struct perf_session *session,
 923                                                union perf_event *event)
 924 {
 925         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 926
 927         if (perf_guest &&
 928             ((cpumode == PERF_RECORD_MISC_GUEST_KERNEL) ||
 929              (cpumode == PERF_RECORD_MISC_GUEST_USER))) {
 930                 u32 pid;
 931
 932                 if (event->header.type == PERF_RECORD_MMAP)
 933                         pid = event->mmap.pid;
 934                 else
 935                         pid = event->ip.pid;
 936
 937                 return perf_session__findnew_machine(session, pid);
 938         }
 939
 940         return perf_session__find_host_machine(session);
 941 }
 942
 943 static int perf_session_deliver_event(struct perf_session *session,
 944                                       union perf_event *event,
 945                                       struct perf_sample *sample,
 946                                       struct perf_tool *tool,
 947                                       u64 file_offset)
 948 {
 949         struct perf_evsel *evsel;
 950         struct machine *machine;
 951
 952         dump_event(session, event, file_offset, sample);
 953
 954         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 955         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
 956                 /*
 957                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
 958                  * because the tools right now may apply filters, discarding
 959                  * some of the samples. For consistency, in the future we
 960                  * should have something like nr_filtered_samples and remove
 961                  * the sample->period from total_sample_period, etc, KISS for
 962                  * now tho.
 963                  *
 964                  * Also testing against NULL allows us to handle files without
 965                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
 966                  * future probably it'll be a good idea to restrict event
 967                  * processing via perf_session to files with both set.
 968                  */
 969                 hists__inc_nr_events(&evsel->hists, event->header.type);
 970         }
 971
 972         machine = perf_session__find_machine_for_cpumode(session, event);
 973
 974         switch (event->header.type) {
 975         case PERF_RECORD_SAMPLE:
 976                 dump_sample(session, event, sample);
 977                 if (evsel == NULL) {
 978                         ++session->hists.stats.nr_unknown_id;
 979                         return 0;
 980                 }
 981                 if (machine == NULL) {
 982                         ++session->hists.stats.nr_unprocessable_samples;
 983                         return 0;
 984                 }
 985                 return tool->sample(tool, event, sample, evsel, machine);
 986         case PERF_RECORD_MMAP:
 987                 return tool->mmap(tool, event, sample, machine);
 988         case PERF_RECORD_COMM:
 989                 return tool->comm(tool, event, sample, machine);
 990         case PERF_RECORD_FORK:
 991                 return tool->fork(tool, event, sample, machine);
 992         case PERF_RECORD_EXIT:
 993                 return tool->exit(tool, event, sample, machine);
 994         case PERF_RECORD_LOST:
 995                 if (tool->lost == perf_event__process_lost)
 996                         session->hists.stats.total_lost += event->lost.lost;
 997                 return tool->lost(tool, event, sample, machine);
 998         case PERF_RECORD_READ:
 999                 return tool->read(tool, event, sample, evsel, machine);
1000         case PERF_RECORD_THROTTLE:
1001                 return tool->throttle(tool, event, sample, machine);
1002         case PERF_RECORD_UNTHROTTLE:
1003                 return tool->unthrottle(tool, event, sample, machine);
1004         default:
1005                 ++session->hists.stats.nr_unknown_events;
1006                 return -1;
1007         }
1008 }
1009
1010 static int perf_session__preprocess_sample(struct perf_session *session,
1011                                            union perf_event *event, struct perf_sample *sample)
1012 {
1013         if (event->header.type != PERF_RECORD_SAMPLE ||
1014             !(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_CALLCHAIN))
1015                 return 0;
1016
1017         if (!ip_callchain__valid(sample->callchain, event)) {
1018                 pr_debug("call-chain problem with event, skipping it.\n");
1019                 ++session->hists.stats.nr_invalid_chains;
1020                 session->hists.stats.total_invalid_chains += sample->period;
1021                 return -EINVAL;
1022         }
1023         return 0;
1024 }
1025
1026 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
1027                                             struct perf_tool *tool, u64 file_offset)
1028 {
1029         int err;
1030
1031         dump_event(session, event, file_offset, NULL);
1032
1033         /* These events are processed right away */
1034         switch (event->header.type) {
1035         case PERF_RECORD_HEADER_ATTR:
1036                 err = tool->attr(event, &session->evlist);
1037                 if (err == 0)
1038                         perf_session__set_id_hdr_size(session);
1039                 return err;
1040         case PERF_RECORD_HEADER_EVENT_TYPE:
1041                 return tool->event_type(tool, event);
1042         case PERF_RECORD_HEADER_TRACING_DATA:
1043                 /* setup for reading amidst mmap */
1044                 lseek(session->fd, file_offset, SEEK_SET);
1045                 return tool->tracing_data(event, session);
1046         case PERF_RECORD_HEADER_BUILD_ID:
1047                 return tool->build_id(tool, event, session);
1048         case PERF_RECORD_FINISHED_ROUND:
1049                 return tool->finished_round(tool, event, session);
1050         default:
1051                 return -EINVAL;
1052         }
1053 }
1054
1055 static void event_swap(union perf_event *event, bool sample_id_all)
1056 {
1057         perf_event__swap_op swap;
1058
1059         swap = perf_event__swap_ops[event->header.type];
1060         if (swap)
1061                 swap(event, sample_id_all);
1062 }
1063
1064 static int perf_session__process_event(struct perf_session *session,
1065                                        union perf_event *event,
1066                                        struct perf_tool *tool,
1067                                        u64 file_offset)
1068 {
1069         struct perf_sample sample;
1070         int ret;
1071
1072         if (session->header.needs_swap)
1073                 event_swap(event, perf_evlist__sample_id_all(session->evlist));
1074
1075         if (event->header.type >= PERF_RECORD_HEADER_MAX)
1076                 return -EINVAL;
1077
1078         hists__inc_nr_events(&session->hists, event->header.type);
1079
1080         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1081                 return perf_session__process_user_event(session, event, tool, file_offset);
1082
1083         /*
1084          * For all kernel events we get the sample data
1085          */
1086         ret = perf_evlist__parse_sample(session->evlist, event, &sample,
1087                                         session->header.needs_swap);
1088         if (ret)
1089                 return ret;
1090
1091         /* Preprocess sample records - precheck callchains */
1092         if (perf_session__preprocess_sample(session, event, &sample))
1093                 return 0;
1094
1095         if (tool->ordered_samples) {
1096                 ret = perf_session_queue_event(session, event, &sample,
1097                                                file_offset);
1098                 if (ret != -ETIME)
1099                         return ret;
1100         }
1101
1102         return perf_session_deliver_event(session, event, &sample, tool,
1103                                           file_offset);
1104 }
1105
1106 void perf_event_header__bswap(struct perf_event_header *self)
1107 {
1108         self->type = bswap_32(self->type);
1109         self->misc = bswap_16(self->misc);
1110         self->size = bswap_16(self->size);
1111 }
1112
1113 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
1114 {
1115         return machine__findnew_thread(&session->host_machine, pid);
1116 }
1117
1118 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1119 {
1120         struct thread *thread = perf_session__findnew(self, 0);
1121
1122         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1123                 pr_err("problem inserting idle task.\n");
1124                 thread = NULL;
1125         }
1126
1127         return thread;
1128 }
1129
1130 static void perf_session__warn_about_errors(const struct perf_session *session,
1131                                             const struct perf_tool *tool)
1132 {
1133         if (tool->lost == perf_event__process_lost &&
1134             session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
1135                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1136                             "Check IO/CPU overload!\n\n",
1137                             session->hists.stats.nr_events[0],
1138                             session->hists.stats.nr_events[PERF_RECORD_LOST]);
1139         }
1140
1141         if (session->hists.stats.nr_unknown_events != 0) {
1142                 ui__warning("Found %u unknown events!\n\n"
1143                             "Is this an older tool processing a perf.data "
1144                             "file generated by a more recent tool?\n\n"
1145                             "If that is not the case, consider "
1146                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1147                             session->hists.stats.nr_unknown_events);
1148         }
1149
1150         if (session->hists.stats.nr_unknown_id != 0) {
1151                 ui__warning("%u samples with id not present in the header\n",
1152                             session->hists.stats.nr_unknown_id);
1153         }
1154
1155         if (session->hists.stats.nr_invalid_chains != 0) {
1156                 ui__warning("Found invalid callchains!\n\n"
1157                             "%u out of %u events were discarded for this reason.\n\n"
1158                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1159                             session->hists.stats.nr_invalid_chains,
1160                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
1161         }
1162
1163         if (session->hists.stats.nr_unprocessable_samples != 0) {
1164                 ui__warning("%u unprocessable samples recorded.\n"
1165                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1166                             session->hists.stats.nr_unprocessable_samples);
1167         }
1168 }
1169
1170 #define session_done()  (*(volatile int *)(&session_done))
1171 volatile int session_done;
1172
1173 static int __perf_session__process_pipe_events(struct perf_session *self,
1174                                                struct perf_tool *tool)
1175 {
1176         union perf_event *event;
1177         uint32_t size, cur_size = 0;
1178         void *buf = NULL;
1179         int skip = 0;
1180         u64 head;
1181         int err;
1182         void *p;
1183
1184         perf_tool__fill_defaults(tool);
1185
1186         head = 0;
1187         cur_size = sizeof(union perf_event);
1188
1189         buf = malloc(cur_size);
1190         if (!buf)
1191                 return -errno;
1192 more:
1193         event = buf;
1194         err = readn(self->fd, event, sizeof(struct perf_event_header));
1195         if (err <= 0) {
1196                 if (err == 0)
1197                         goto done;
1198
1199                 pr_err("failed to read event header\n");
1200                 goto out_err;
1201         }
1202
1203         if (self->header.needs_swap)
1204                 perf_event_header__bswap(&event->header);
1205
1206         size = event->header.size;
1207         if (size == 0)
1208                 size = 8;
1209
1210         if (size > cur_size) {
1211                 void *new = realloc(buf, size);
1212                 if (!new) {
1213                         pr_err("failed to allocate memory to read event\n");
1214                         goto out_err;
1215                 }
1216                 buf = new;
1217                 cur_size = size;
1218                 event = buf;
1219         }
1220         p = event;
1221         p += sizeof(struct perf_event_header);
1222
1223         if (size - sizeof(struct perf_event_header)) {
1224                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1225                 if (err <= 0) {
1226                         if (err == 0) {
1227                                 pr_err("unexpected end of event stream\n");
1228                                 goto done;
1229                         }
1230
1231                         pr_err("failed to read event data\n");
1232                         goto out_err;
1233                 }
1234         }
1235
1236         if ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
1237                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1238                        head, event->header.size, event->header.type);
1239                 err = -EINVAL;
1240                 goto out_err;
1241         }
1242
1243         head += size;
1244
1245         if (skip > 0)
1246                 head += skip;
1247
1248         if (!session_done())
1249                 goto more;
1250 done:
1251         err = 0;
1252 out_err:
1253         free(buf);
1254         perf_session__warn_about_errors(self, tool);
1255         perf_session_free_sample_buffers(self);
1256         return err;
1257 }
1258
1259 static union perf_event *
1260 fetch_mmaped_event(struct perf_session *session,
1261                    u64 head, size_t mmap_size, char *buf)
1262 {
1263         union perf_event *event;
1264
1265         /*
1266          * Ensure we have enough space remaining to read
1267          * the size of the event in the headers.
1268          */
1269         if (head + sizeof(event->header) > mmap_size)
1270                 return NULL;
1271
1272         event = (union perf_event *)(buf + head);
1273
1274         if (session->header.needs_swap)
1275                 perf_event_header__bswap(&event->header);
1276
1277         if (head + event->header.size > mmap_size)
1278                 return NULL;
1279
1280         return event;
1281 }
1282
1283 int __perf_session__process_events(struct perf_session *session,
1284                                    u64 data_offset, u64 data_size,
1285                                    u64 file_size, struct perf_tool *tool)
1286 {
1287         u64 head, page_offset, file_offset, file_pos, progress_next;
1288         int err, mmap_prot, mmap_flags, map_idx = 0;
1289         size_t  page_size, mmap_size;
1290         char *buf, *mmaps[8];
1291         union perf_event *event;
1292         uint32_t size;
1293
1294         perf_tool__fill_defaults(tool);
1295
1296         page_size = sysconf(_SC_PAGESIZE);
1297
1298         page_offset = page_size * (data_offset / page_size);
1299         file_offset = page_offset;
1300         head = data_offset - page_offset;
1301
1302         if (data_offset + data_size < file_size)
1303                 file_size = data_offset + data_size;
1304
1305         progress_next = file_size / 16;
1306
1307         mmap_size = session->mmap_window;
1308         if (mmap_size > file_size)
1309                 mmap_size = file_size;
1310
1311         memset(mmaps, 0, sizeof(mmaps));
1312
1313         mmap_prot  = PROT_READ;
1314         mmap_flags = MAP_SHARED;
1315
1316         if (session->header.needs_swap) {
1317                 mmap_prot  |= PROT_WRITE;
1318                 mmap_flags = MAP_PRIVATE;
1319         }
1320 remap:
1321         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1322                    file_offset);
1323         if (buf == MAP_FAILED) {
1324                 pr_err("failed to mmap file\n");
1325                 err = -errno;
1326                 goto out_err;
1327         }
1328         mmaps[map_idx] = buf;
1329         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1330         file_pos = file_offset + head;
1331
1332 more:
1333         event = fetch_mmaped_event(session, head, mmap_size, buf);
1334         if (!event) {
1335                 if (mmaps[map_idx]) {
1336                         munmap(mmaps[map_idx], mmap_size);
1337                         mmaps[map_idx] = NULL;
1338                 }
1339
1340                 page_offset = page_size * (head / page_size);
1341                 file_offset += page_offset;
1342                 head -= page_offset;
1343                 goto remap;
1344         }
1345
1346         size = event->header.size;
1347
1348         if (size == 0 ||
1349             perf_session__process_event(session, event, tool, file_pos) < 0) {
1350                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1351                        file_offset + head, event->header.size,
1352                        event->header.type);
1353                 err = -EINVAL;
1354                 goto out_err;
1355         }
1356
1357         head += size;
1358         file_pos += size;
1359
1360         if (file_pos >= progress_next) {
1361                 progress_next += file_size / 16;
1362                 ui_progress__update(file_pos, file_size,
1363                                     "Processing events...");
1364         }
1365
1366         if (file_pos < file_size)
1367                 goto more;
1368
1369         err = 0;
1370         /* do the final flush for ordered samples */
1371         session->ordered_samples.next_flush = ULLONG_MAX;
1372         flush_sample_queue(session, tool);
1373 out_err:
1374         perf_session__warn_about_errors(session, tool);
1375         perf_session_free_sample_buffers(session);
1376         return err;
1377 }
1378
1379 int perf_session__process_events(struct perf_session *self,
1380                                  struct perf_tool *tool)
1381 {
1382         int err;
1383
1384         if (perf_session__register_idle_thread(self) == NULL)
1385                 return -ENOMEM;
1386
1387         if (!self->fd_pipe)
1388                 err = __perf_session__process_events(self,
1389                                                      self->header.data_offset,
1390                                                      self->header.data_size,
1391                                                      self->size, tool);
1392         else
1393                 err = __perf_session__process_pipe_events(self, tool);
1394
1395         return err;
1396 }
1397
1398 bool perf_session__has_traces(struct perf_session *session, const char *msg)
1399 {
1400         if (!(perf_evlist__sample_type(session->evlist) & PERF_SAMPLE_RAW)) {
1401                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1402                 return false;
1403         }
1404
1405         return true;
1406 }
1407
1408 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1409                                      const char *symbol_name, u64 addr)
1410 {
1411         char *bracket;
1412         enum map_type i;
1413         struct ref_reloc_sym *ref;
1414
1415         ref = zalloc(sizeof(struct ref_reloc_sym));
1416         if (ref == NULL)
1417                 return -ENOMEM;
1418
1419         ref->name = strdup(symbol_name);
1420         if (ref->name == NULL) {
1421                 free(ref);
1422                 return -ENOMEM;
1423         }
1424
1425         bracket = strchr(ref->name, ']');
1426         if (bracket)
1427                 *bracket = '\0';
1428
1429         ref->addr = addr;
1430
1431         for (i = 0; i < MAP__NR_TYPES; ++i) {
1432                 struct kmap *kmap = map__kmap(maps[i]);
1433                 kmap->ref_reloc_sym = ref;
1434         }
1435
1436         return 0;
1437 }
1438
1439 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1440 {
1441         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1442                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1443                machines__fprintf_dsos(&self->machines, fp);
1444 }
1445
1446 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1447                                           bool with_hits)
1448 {
1449         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1450         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1451 }
1452
1453 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1454 {
1455         struct perf_evsel *pos;
1456         size_t ret = fprintf(fp, "Aggregated stats:\n");
1457
1458         ret += hists__fprintf_nr_events(&session->hists, fp);
1459
1460         list_for_each_entry(pos, &session->evlist->entries, node) {
1461                 ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
1462                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1463         }
1464
1465         return ret;
1466 }
1467
1468 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1469 {
1470         /*
1471          * FIXME: Here we have to actually print all the machines in this
1472          * session, not just the host...
1473          */
1474         return machine__fprintf(&session->host_machine, fp);
1475 }
1476
1477 void perf_session__remove_thread(struct perf_session *session,
1478                                  struct thread *th)
1479 {
1480         /*
1481          * FIXME: This one makes no sense, we need to remove the thread from
1482          * the machine it belongs to, perf_session can have many machines, so
1483          * doing it always on ->host_machine is wrong.  Fix when auditing all
1484          * the 'perf kvm' code.
1485          */
1486         machine__remove_thread(&session->host_machine, th);
1487 }
1488
1489 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1490                                               unsigned int type)
1491 {
1492         struct perf_evsel *pos;
1493
1494         list_for_each_entry(pos, &session->evlist->entries, node) {
1495                 if (pos->attr.type == type)
1496                         return pos;
1497         }
1498         return NULL;
1499 }
1500
1501 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1502                           struct machine *machine, int print_sym,
1503                           int print_dso, int print_symoffset)
1504 {
1505         struct addr_location al;
1506         struct callchain_cursor_node *node;
1507
1508         if (perf_event__preprocess_sample(event, machine, &al, sample,
1509                                           NULL) < 0) {
1510                 error("problem processing %d event, skipping it.\n",
1511                         event->header.type);
1512                 return;
1513         }
1514
1515         if (symbol_conf.use_callchain && sample->callchain) {
1516
1517                 if (machine__resolve_callchain(machine, al.thread,
1518                                                 sample->callchain, NULL) != 0) {
1519                         if (verbose)
1520                                 error("Failed to resolve callchain. Skipping\n");
1521                         return;
1522                 }
1523                 callchain_cursor_commit(&callchain_cursor);
1524
1525                 while (1) {
1526                         node = callchain_cursor_current(&callchain_cursor);
1527                         if (!node)
1528                                 break;
1529
1530                         printf("\t%16" PRIx64, node->ip);
1531                         if (print_sym) {
1532                                 printf(" ");
1533                                 symbol__fprintf_symname(node->sym, stdout);
1534                         }
1535                         if (print_dso) {
1536                                 printf(" (");
1537                                 map__fprintf_dsoname(node->map, stdout);
1538                                 printf(")");
1539                         }
1540                         printf("\n");
1541
1542                         callchain_cursor_advance(&callchain_cursor);
1543                 }
1544
1545         } else {
1546                 printf("%16" PRIx64, sample->ip);
1547                 if (print_sym) {
1548                         printf(" ");
1549                         if (print_symoffset)
1550                                 symbol__fprintf_symname_offs(al.sym, &al,
1551                                                              stdout);
1552                         else
1553                                 symbol__fprintf_symname(al.sym, stdout);
1554                 }
1555
1556                 if (print_dso) {
1557                         printf(" (");
1558                         map__fprintf_dsoname(al.map, stdout);
1559                         printf(")");
1560                 }
1561         }
1562 }
1563
1564 int perf_session__cpu_bitmap(struct perf_session *session,
1565                              const char *cpu_list, unsigned long *cpu_bitmap)
1566 {
1567         int i;
1568         struct cpu_map *map;
1569
1570         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1571                 struct perf_evsel *evsel;
1572
1573                 evsel = perf_session__find_first_evtype(session, i);
1574                 if (!evsel)
1575                         continue;
1576
1577                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1578                         pr_err("File does not contain CPU events. "
1579                                "Remove -c option to proceed.\n");
1580                         return -1;
1581                 }
1582         }
1583
1584         map = cpu_map__new(cpu_list);
1585         if (map == NULL) {
1586                 pr_err("Invalid cpu_list\n");
1587                 return -1;
1588         }
1589
1590         for (i = 0; i < map->nr; i++) {
1591                 int cpu = map->map[i];
1592
1593                 if (cpu >= MAX_NR_CPUS) {
1594                         pr_err("Requested CPU %d too large. "
1595                                "Consider raising MAX_NR_CPUS\n", cpu);
1596                         return -1;
1597                 }
1598
1599                 set_bit(cpu, cpu_bitmap);
1600         }
1601
1602         return 0;
1603 }
1604
1605 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1606                                 bool full)
1607 {
1608         struct stat st;
1609         int ret;
1610
1611         if (session == NULL || fp == NULL)
1612                 return;
1613
1614         ret = fstat(session->fd, &st);
1615         if (ret == -1)
1616                 return;
1617
1618         fprintf(fp, "# ========\n");
1619         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1620         perf_header__fprintf_info(session, fp, full);
1621         fprintf(fp, "# ========\n#\n");
1622 }
1623
1624
1625 int __perf_session__set_tracepoints_handlers(struct perf_session *session,
1626                                              const struct perf_evsel_str_handler *assocs,
1627                                              size_t nr_assocs)
1628 {
1629         struct perf_evlist *evlist = session->evlist;
1630         struct event_format *format;
1631         struct perf_evsel *evsel;
1632         char *tracepoint, *name;
1633         size_t i;
1634         int err;
1635
1636         for (i = 0; i < nr_assocs; i++) {
1637                 err = -ENOMEM;
1638                 tracepoint = strdup(assocs[i].name);
1639                 if (tracepoint == NULL)
1640                         goto out;
1641
1642                 err = -ENOENT;
1643                 name = strchr(tracepoint, ':');
1644                 if (name == NULL)
1645                         goto out_free;
1646
1647                 *name++ = '\0';
1648                 format = pevent_find_event_by_name(session->pevent,
1649                                                    tracepoint, name);
1650                 if (format == NULL) {
1651                         /*
1652                          * Adding a handler for an event not in the session,
1653                          * just ignore it.
1654                          */
1655                         goto next;
1656                 }
1657
1658                 evsel = perf_evlist__find_tracepoint_by_id(evlist, format->id);
1659                 if (evsel == NULL)
1660                         goto next;
1661
1662                 err = -EEXIST;
1663                 if (evsel->handler.func != NULL)
1664                         goto out_free;
1665                 evsel->handler.func = assocs[i].handler;
1666 next:
1667                 free(tracepoint);
1668         }
1669
1670         err = 0;
1671 out:
1672         return err;
1673
1674 out_free:
1675         free(tracepoint);
1676         goto out;
1677 }