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 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_64(void *src, int byte_size)
 446 {
 447         u64 *m = src;
 448
 449         while (byte_size > 0) {
 450                 *m = bswap_64(*m);
 451                 byte_size -= sizeof(u64);
 452                 ++m;
 453         }
 454 }
 455
 456 static void swap_sample_id_all(union perf_event *event, void *data)
 457 {
 458         void *end = (void *) event + event->header.size;
 459         int size = end - data;
 460
 461         BUG_ON(size % sizeof(u64));
 462         mem_bswap_64(data, size);
 463 }
 464
 465 static void perf_event__all64_swap(union perf_event *event,
 466                                    bool sample_id_all __used)
 467 {
 468         struct perf_event_header *hdr = &event->header;
 469         mem_bswap_64(hdr + 1, event->header.size - sizeof(*hdr));
 470 }
 471
 472 static void perf_event__comm_swap(union perf_event *event, bool sample_id_all)
 473 {
 474         event->comm.pid = bswap_32(event->comm.pid);
 475         event->comm.tid = bswap_32(event->comm.tid);
 476
 477         if (sample_id_all) {
 478                 void *data = &event->comm.comm;
 479
 480                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 481                 swap_sample_id_all(event, data);
 482         }
 483 }
 484
 485 static void perf_event__mmap_swap(union perf_event *event,
 486                                   bool sample_id_all)
 487 {
 488         event->mmap.pid   = bswap_32(event->mmap.pid);
 489         event->mmap.tid   = bswap_32(event->mmap.tid);
 490         event->mmap.start = bswap_64(event->mmap.start);
 491         event->mmap.len   = bswap_64(event->mmap.len);
 492         event->mmap.pgoff = bswap_64(event->mmap.pgoff);
 493
 494         if (sample_id_all) {
 495                 void *data = &event->mmap.filename;
 496
 497                 data += ALIGN(strlen(data) + 1, sizeof(u64));
 498                 swap_sample_id_all(event, data);
 499         }
 500 }
 501
 502 static void perf_event__task_swap(union perf_event *event, bool sample_id_all)
 503 {
 504         event->fork.pid  = bswap_32(event->fork.pid);
 505         event->fork.tid  = bswap_32(event->fork.tid);
 506         event->fork.ppid = bswap_32(event->fork.ppid);
 507         event->fork.ptid = bswap_32(event->fork.ptid);
 508         event->fork.time = bswap_64(event->fork.time);
 509
 510         if (sample_id_all)
 511                 swap_sample_id_all(event, &event->fork + 1);
 512 }
 513
 514 static void perf_event__read_swap(union perf_event *event, bool sample_id_all)
 515 {
 516         event->read.pid          = bswap_32(event->read.pid);
 517         event->read.tid          = bswap_32(event->read.tid);
 518         event->read.value        = bswap_64(event->read.value);
 519         event->read.time_enabled = bswap_64(event->read.time_enabled);
 520         event->read.time_running = bswap_64(event->read.time_running);
 521         event->read.id           = bswap_64(event->read.id);
 522
 523         if (sample_id_all)
 524                 swap_sample_id_all(event, &event->read + 1);
 525 }
 526
 527 static u8 revbyte(u8 b)
 528 {
 529         int rev = (b >> 4) | ((b & 0xf) << 4);
 530         rev = ((rev & 0xcc) >> 2) | ((rev & 0x33) << 2);
 531         rev = ((rev & 0xaa) >> 1) | ((rev & 0x55) << 1);
 532         return (u8) rev;
 533 }
 534
 535 /*
 536  * XXX this is hack in attempt to carry flags bitfield
 537  * throught endian village. ABI says:
 538  *
 539  * Bit-fields are allocated from right to left (least to most significant)
 540  * on little-endian implementations and from left to right (most to least
 541  * significant) on big-endian implementations.
 542  *
 543  * The above seems to be byte specific, so we need to reverse each
 544  * byte of the bitfield. 'Internet' also says this might be implementation
 545  * specific and we probably need proper fix and carry perf_event_attr
 546  * bitfield flags in separate data file FEAT_ section. Thought this seems
 547  * to work for now.
 548  */
 549 static void swap_bitfield(u8 *p, unsigned len)
 550 {
 551         unsigned i;
 552
 553         for (i = 0; i < len; i++) {
 554                 *p = revbyte(*p);
 555                 p++;
 556         }
 557 }
 558
 559 /* exported for swapping attributes in file header */
 560 void perf_event__attr_swap(struct perf_event_attr *attr)
 561 {
 562         attr->type              = bswap_32(attr->type);
 563         attr->size              = bswap_32(attr->size);
 564         attr->config            = bswap_64(attr->config);
 565         attr->sample_period     = bswap_64(attr->sample_period);
 566         attr->sample_type       = bswap_64(attr->sample_type);
 567         attr->read_format       = bswap_64(attr->read_format);
 568         attr->wakeup_events     = bswap_32(attr->wakeup_events);
 569         attr->bp_type           = bswap_32(attr->bp_type);
 570         attr->bp_addr           = bswap_64(attr->bp_addr);
 571         attr->bp_len            = bswap_64(attr->bp_len);
 572
 573         swap_bitfield((u8 *) (&attr->read_format + 1), sizeof(u64));
 574 }
 575
 576 static void perf_event__hdr_attr_swap(union perf_event *event,
 577                                       bool sample_id_all __used)
 578 {
 579         size_t size;
 580
 581         perf_event__attr_swap(&event->attr.attr);
 582
 583         size = event->header.size;
 584         size -= (void *)&event->attr.id - (void *)event;
 585         mem_bswap_64(event->attr.id, size);
 586 }
 587
 588 static void perf_event__event_type_swap(union perf_event *event,
 589                                         bool sample_id_all __used)
 590 {
 591         event->event_type.event_type.event_id =
 592                 bswap_64(event->event_type.event_type.event_id);
 593 }
 594
 595 static void perf_event__tracing_data_swap(union perf_event *event,
 596                                           bool sample_id_all __used)
 597 {
 598         event->tracing_data.size = bswap_32(event->tracing_data.size);
 599 }
 600
 601 typedef void (*perf_event__swap_op)(union perf_event *event,
 602                                     bool sample_id_all);
 603
 604 static perf_event__swap_op perf_event__swap_ops[] = {
 605         [PERF_RECORD_MMAP]                = perf_event__mmap_swap,
 606         [PERF_RECORD_COMM]                = perf_event__comm_swap,
 607         [PERF_RECORD_FORK]                = perf_event__task_swap,
 608         [PERF_RECORD_EXIT]                = perf_event__task_swap,
 609         [PERF_RECORD_LOST]                = perf_event__all64_swap,
 610         [PERF_RECORD_READ]                = perf_event__read_swap,
 611         [PERF_RECORD_SAMPLE]              = perf_event__all64_swap,
 612         [PERF_RECORD_HEADER_ATTR]         = perf_event__hdr_attr_swap,
 613         [PERF_RECORD_HEADER_EVENT_TYPE]   = perf_event__event_type_swap,
 614         [PERF_RECORD_HEADER_TRACING_DATA] = perf_event__tracing_data_swap,
 615         [PERF_RECORD_HEADER_BUILD_ID]     = NULL,
 616         [PERF_RECORD_HEADER_MAX]          = NULL,
 617 };
 618
 619 struct sample_queue {
 620         u64                     timestamp;
 621         u64                     file_offset;
 622         union perf_event        *event;
 623         struct list_head        list;
 624 };
 625
 626 static void perf_session_free_sample_buffers(struct perf_session *session)
 627 {
 628         struct ordered_samples *os = &session->ordered_samples;
 629
 630         while (!list_empty(&os->to_free)) {
 631                 struct sample_queue *sq;
 632
 633                 sq = list_entry(os->to_free.next, struct sample_queue, list);
 634                 list_del(&sq->list);
 635                 free(sq);
 636         }
 637 }
 638
 639 static int perf_session_deliver_event(struct perf_session *session,
 640                                       union perf_event *event,
 641                                       struct perf_sample *sample,
 642                                       struct perf_tool *tool,
 643                                       u64 file_offset);
 644
 645 static void flush_sample_queue(struct perf_session *s,
 646                                struct perf_tool *tool)
 647 {
 648         struct ordered_samples *os = &s->ordered_samples;
 649         struct list_head *head = &os->samples;
 650         struct sample_queue *tmp, *iter;
 651         struct perf_sample sample;
 652         u64 limit = os->next_flush;
 653         u64 last_ts = os->last_sample ? os->last_sample->timestamp : 0ULL;
 654         unsigned idx = 0, progress_next = os->nr_samples / 16;
 655         int ret;
 656
 657         if (!tool->ordered_samples || !limit)
 658                 return;
 659
 660         list_for_each_entry_safe(iter, tmp, head, list) {
 661                 if (iter->timestamp > limit)
 662                         break;
 663
 664                 ret = perf_session__parse_sample(s, iter->event, &sample);
 665                 if (ret)
 666                         pr_err("Can't parse sample, err = %d\n", ret);
 667                 else
 668                         perf_session_deliver_event(s, iter->event, &sample, tool,
 669                                                    iter->file_offset);
 670
 671                 os->last_flush = iter->timestamp;
 672                 list_del(&iter->list);
 673                 list_add(&iter->list, &os->sample_cache);
 674                 if (++idx >= progress_next) {
 675                         progress_next += os->nr_samples / 16;
 676                         ui_progress__update(idx, os->nr_samples,
 677                                             "Processing time ordered events...");
 678                 }
 679         }
 680
 681         if (list_empty(head)) {
 682                 os->last_sample = NULL;
 683         } else if (last_ts <= limit) {
 684                 os->last_sample =
 685                         list_entry(head->prev, struct sample_queue, list);
 686         }
 687
 688         os->nr_samples = 0;
 689 }
 690
 691 /*
 692  * When perf record finishes a pass on every buffers, it records this pseudo
 693  * event.
 694  * We record the max timestamp t found in the pass n.
 695  * Assuming these timestamps are monotonic across cpus, we know that if
 696  * a buffer still has events with timestamps below t, they will be all
 697  * available and then read in the pass n + 1.
 698  * Hence when we start to read the pass n + 2, we can safely flush every
 699  * events with timestamps below t.
 700  *
 701  *    ============ PASS n =================
 702  *       CPU 0         |   CPU 1
 703  *                     |
 704  *    cnt1 timestamps  |   cnt2 timestamps
 705  *          1          |         2
 706  *          2          |         3
 707  *          -          |         4  <--- max recorded
 708  *
 709  *    ============ PASS n + 1 ==============
 710  *       CPU 0         |   CPU 1
 711  *                     |
 712  *    cnt1 timestamps  |   cnt2 timestamps
 713  *          3          |         5
 714  *          4          |         6
 715  *          5          |         7 <---- max recorded
 716  *
 717  *      Flush every events below timestamp 4
 718  *
 719  *    ============ PASS n + 2 ==============
 720  *       CPU 0         |   CPU 1
 721  *                     |
 722  *    cnt1 timestamps  |   cnt2 timestamps
 723  *          6          |         8
 724  *          7          |         9
 725  *          -          |         10
 726  *
 727  *      Flush every events below timestamp 7
 728  *      etc...
 729  */
 730 static int process_finished_round(struct perf_tool *tool,
 731                                   union perf_event *event __used,
 732                                   struct perf_session *session)
 733 {
 734         flush_sample_queue(session, tool);
 735         session->ordered_samples.next_flush = session->ordered_samples.max_timestamp;
 736
 737         return 0;
 738 }
 739
 740 /* The queue is ordered by time */
 741 static void __queue_event(struct sample_queue *new, struct perf_session *s)
 742 {
 743         struct ordered_samples *os = &s->ordered_samples;
 744         struct sample_queue *sample = os->last_sample;
 745         u64 timestamp = new->timestamp;
 746         struct list_head *p;
 747
 748         ++os->nr_samples;
 749         os->last_sample = new;
 750
 751         if (!sample) {
 752                 list_add(&new->list, &os->samples);
 753                 os->max_timestamp = timestamp;
 754                 return;
 755         }
 756
 757         /*
 758          * last_sample might point to some random place in the list as it's
 759          * the last queued event. We expect that the new event is close to
 760          * this.
 761          */
 762         if (sample->timestamp <= timestamp) {
 763                 while (sample->timestamp <= timestamp) {
 764                         p = sample->list.next;
 765                         if (p == &os->samples) {
 766                                 list_add_tail(&new->list, &os->samples);
 767                                 os->max_timestamp = timestamp;
 768                                 return;
 769                         }
 770                         sample = list_entry(p, struct sample_queue, list);
 771                 }
 772                 list_add_tail(&new->list, &sample->list);
 773         } else {
 774                 while (sample->timestamp > timestamp) {
 775                         p = sample->list.prev;
 776                         if (p == &os->samples) {
 777                                 list_add(&new->list, &os->samples);
 778                                 return;
 779                         }
 780                         sample = list_entry(p, struct sample_queue, list);
 781                 }
 782                 list_add(&new->list, &sample->list);
 783         }
 784 }
 785
 786 #define MAX_SAMPLE_BUFFER       (64 * 1024 / sizeof(struct sample_queue))
 787
 788 static int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 789                                     struct perf_sample *sample, u64 file_offset)
 790 {
 791         struct ordered_samples *os = &s->ordered_samples;
 792         struct list_head *sc = &os->sample_cache;
 793         u64 timestamp = sample->time;
 794         struct sample_queue *new;
 795
 796         if (!timestamp || timestamp == ~0ULL)
 797                 return -ETIME;
 798
 799         if (timestamp < s->ordered_samples.last_flush) {
 800                 printf("Warning: Timestamp below last timeslice flush\n");
 801                 return -EINVAL;
 802         }
 803
 804         if (!list_empty(sc)) {
 805                 new = list_entry(sc->next, struct sample_queue, list);
 806                 list_del(&new->list);
 807         } else if (os->sample_buffer) {
 808                 new = os->sample_buffer + os->sample_buffer_idx;
 809                 if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
 810                         os->sample_buffer = NULL;
 811         } else {
 812                 os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
 813                 if (!os->sample_buffer)
 814                         return -ENOMEM;
 815                 list_add(&os->sample_buffer->list, &os->to_free);
 816                 os->sample_buffer_idx = 2;
 817                 new = os->sample_buffer + 1;
 818         }
 819
 820         new->timestamp = timestamp;
 821         new->file_offset = file_offset;
 822         new->event = event;
 823
 824         __queue_event(new, s);
 825
 826         return 0;
 827 }
 828
 829 static void callchain__printf(struct perf_sample *sample)
 830 {
 831         unsigned int i;
 832
 833         printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
 834
 835         for (i = 0; i < sample->callchain->nr; i++)
 836                 printf("..... %2d: %016" PRIx64 "\n",
 837                        i, sample->callchain->ips[i]);
 838 }
 839
 840 static void branch_stack__printf(struct perf_sample *sample)
 841 {
 842         uint64_t i;
 843
 844         printf("... branch stack: nr:%" PRIu64 "\n", sample->branch_stack->nr);
 845
 846         for (i = 0; i < sample->branch_stack->nr; i++)
 847                 printf("..... %2"PRIu64": %016" PRIx64 " -> %016" PRIx64 "\n",
 848                         i, sample->branch_stack->entries[i].from,
 849                         sample->branch_stack->entries[i].to);
 850 }
 851
 852 static void perf_session__print_tstamp(struct perf_session *session,
 853                                        union perf_event *event,
 854                                        struct perf_sample *sample)
 855 {
 856         if (event->header.type != PERF_RECORD_SAMPLE &&
 857             !session->sample_id_all) {
 858                 fputs("-1 -1 ", stdout);
 859                 return;
 860         }
 861
 862         if ((session->sample_type & PERF_SAMPLE_CPU))
 863                 printf("%u ", sample->cpu);
 864
 865         if (session->sample_type & PERF_SAMPLE_TIME)
 866                 printf("%" PRIu64 " ", sample->time);
 867 }
 868
 869 static void dump_event(struct perf_session *session, union perf_event *event,
 870                        u64 file_offset, struct perf_sample *sample)
 871 {
 872         if (!dump_trace)
 873                 return;
 874
 875         printf("\n%#" PRIx64 " [%#x]: event: %d\n",
 876                file_offset, event->header.size, event->header.type);
 877
 878         trace_event(event);
 879
 880         if (sample)
 881                 perf_session__print_tstamp(session, event, sample);
 882
 883         printf("%#" PRIx64 " [%#x]: PERF_RECORD_%s", file_offset,
 884                event->header.size, perf_event__name(event->header.type));
 885 }
 886
 887 static void dump_sample(struct perf_session *session, union perf_event *event,
 888                         struct perf_sample *sample)
 889 {
 890         if (!dump_trace)
 891                 return;
 892
 893         printf("(IP, %d): %d/%d: %#" PRIx64 " period: %" PRIu64 " addr: %#" PRIx64 "\n",
 894                event->header.misc, sample->pid, sample->tid, sample->ip,
 895                sample->period, sample->addr);
 896
 897         if (session->sample_type & PERF_SAMPLE_CALLCHAIN)
 898                 callchain__printf(sample);
 899
 900         if (session->sample_type & PERF_SAMPLE_BRANCH_STACK)
 901                 branch_stack__printf(sample);
 902 }
 903
 904 static struct machine *
 905         perf_session__find_machine_for_cpumode(struct perf_session *session,
 906                                                union perf_event *event)
 907 {
 908         const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 909
 910         if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 911                 u32 pid;
 912
 913                 if (event->header.type == PERF_RECORD_MMAP)
 914                         pid = event->mmap.pid;
 915                 else
 916                         pid = event->ip.pid;
 917
 918                 return perf_session__find_machine(session, pid);
 919         }
 920
 921         return perf_session__find_host_machine(session);
 922 }
 923
 924 static int perf_session_deliver_event(struct perf_session *session,
 925                                       union perf_event *event,
 926                                       struct perf_sample *sample,
 927                                       struct perf_tool *tool,
 928                                       u64 file_offset)
 929 {
 930         struct perf_evsel *evsel;
 931         struct machine *machine;
 932
 933         dump_event(session, event, file_offset, sample);
 934
 935         evsel = perf_evlist__id2evsel(session->evlist, sample->id);
 936         if (evsel != NULL && event->header.type != PERF_RECORD_SAMPLE) {
 937                 /*
 938                  * XXX We're leaving PERF_RECORD_SAMPLE unnacounted here
 939                  * because the tools right now may apply filters, discarding
 940                  * some of the samples. For consistency, in the future we
 941                  * should have something like nr_filtered_samples and remove
 942                  * the sample->period from total_sample_period, etc, KISS for
 943                  * now tho.
 944                  *
 945                  * Also testing against NULL allows us to handle files without
 946                  * attr.sample_id_all and/or without PERF_SAMPLE_ID. In the
 947                  * future probably it'll be a good idea to restrict event
 948                  * processing via perf_session to files with both set.
 949                  */
 950                 hists__inc_nr_events(&evsel->hists, event->header.type);
 951         }
 952
 953         machine = perf_session__find_machine_for_cpumode(session, event);
 954
 955         switch (event->header.type) {
 956         case PERF_RECORD_SAMPLE:
 957                 dump_sample(session, event, sample);
 958                 if (evsel == NULL) {
 959                         ++session->hists.stats.nr_unknown_id;
 960                         return 0;
 961                 }
 962                 if (machine == NULL) {
 963                         ++session->hists.stats.nr_unprocessable_samples;
 964                         return 0;
 965                 }
 966                 return tool->sample(tool, event, sample, evsel, machine);
 967         case PERF_RECORD_MMAP:
 968                 return tool->mmap(tool, event, sample, machine);
 969         case PERF_RECORD_COMM:
 970                 return tool->comm(tool, event, sample, machine);
 971         case PERF_RECORD_FORK:
 972                 return tool->fork(tool, event, sample, machine);
 973         case PERF_RECORD_EXIT:
 974                 return tool->exit(tool, event, sample, machine);
 975         case PERF_RECORD_LOST:
 976                 if (tool->lost == perf_event__process_lost)
 977                         session->hists.stats.total_lost += event->lost.lost;
 978                 return tool->lost(tool, event, sample, machine);
 979         case PERF_RECORD_READ:
 980                 return tool->read(tool, event, sample, evsel, machine);
 981         case PERF_RECORD_THROTTLE:
 982                 return tool->throttle(tool, event, sample, machine);
 983         case PERF_RECORD_UNTHROTTLE:
 984                 return tool->unthrottle(tool, event, sample, machine);
 985         default:
 986                 ++session->hists.stats.nr_unknown_events;
 987                 return -1;
 988         }
 989 }
 990
 991 static int perf_session__preprocess_sample(struct perf_session *session,
 992                                            union perf_event *event, struct perf_sample *sample)
 993 {
 994         if (event->header.type != PERF_RECORD_SAMPLE ||
 995             !(session->sample_type & PERF_SAMPLE_CALLCHAIN))
 996                 return 0;
 997
 998         if (!ip_callchain__valid(sample->callchain, event)) {
 999                 pr_debug("call-chain problem with event, skipping it.\n");
1000                 ++session->hists.stats.nr_invalid_chains;
1001                 session->hists.stats.total_invalid_chains += sample->period;
1002                 return -EINVAL;
1003         }
1004         return 0;
1005 }
1006
1007 static int perf_session__process_user_event(struct perf_session *session, union perf_event *event,
1008                                             struct perf_tool *tool, u64 file_offset)
1009 {
1010         int err;
1011
1012         dump_event(session, event, file_offset, NULL);
1013
1014         /* These events are processed right away */
1015         switch (event->header.type) {
1016         case PERF_RECORD_HEADER_ATTR:
1017                 err = tool->attr(event, &session->evlist);
1018                 if (err == 0)
1019                         perf_session__update_sample_type(session);
1020                 return err;
1021         case PERF_RECORD_HEADER_EVENT_TYPE:
1022                 return tool->event_type(tool, event);
1023         case PERF_RECORD_HEADER_TRACING_DATA:
1024                 /* setup for reading amidst mmap */
1025                 lseek(session->fd, file_offset, SEEK_SET);
1026                 return tool->tracing_data(event, session);
1027         case PERF_RECORD_HEADER_BUILD_ID:
1028                 return tool->build_id(tool, event, session);
1029         case PERF_RECORD_FINISHED_ROUND:
1030                 return tool->finished_round(tool, event, session);
1031         default:
1032                 return -EINVAL;
1033         }
1034 }
1035
1036 static void event_swap(union perf_event *event, bool sample_id_all)
1037 {
1038         perf_event__swap_op swap;
1039
1040         swap = perf_event__swap_ops[event->header.type];
1041         if (swap)
1042                 swap(event, sample_id_all);
1043 }
1044
1045 static int perf_session__process_event(struct perf_session *session,
1046                                        union perf_event *event,
1047                                        struct perf_tool *tool,
1048                                        u64 file_offset)
1049 {
1050         struct perf_sample sample;
1051         int ret;
1052
1053         if (session->header.needs_swap)
1054                 event_swap(event, session->sample_id_all);
1055
1056         if (event->header.type >= PERF_RECORD_HEADER_MAX)
1057                 return -EINVAL;
1058
1059         hists__inc_nr_events(&session->hists, event->header.type);
1060
1061         if (event->header.type >= PERF_RECORD_USER_TYPE_START)
1062                 return perf_session__process_user_event(session, event, tool, file_offset);
1063
1064         /*
1065          * For all kernel events we get the sample data
1066          */
1067         ret = perf_session__parse_sample(session, event, &sample);
1068         if (ret)
1069                 return ret;
1070
1071         /* Preprocess sample records - precheck callchains */
1072         if (perf_session__preprocess_sample(session, event, &sample))
1073                 return 0;
1074
1075         if (tool->ordered_samples) {
1076                 ret = perf_session_queue_event(session, event, &sample,
1077                                                file_offset);
1078                 if (ret != -ETIME)
1079                         return ret;
1080         }
1081
1082         return perf_session_deliver_event(session, event, &sample, tool,
1083                                           file_offset);
1084 }
1085
1086 void perf_event_header__bswap(struct perf_event_header *self)
1087 {
1088         self->type = bswap_32(self->type);
1089         self->misc = bswap_16(self->misc);
1090         self->size = bswap_16(self->size);
1091 }
1092
1093 struct thread *perf_session__findnew(struct perf_session *session, pid_t pid)
1094 {
1095         return machine__findnew_thread(&session->host_machine, pid);
1096 }
1097
1098 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
1099 {
1100         struct thread *thread = perf_session__findnew(self, 0);
1101
1102         if (thread == NULL || thread__set_comm(thread, "swapper")) {
1103                 pr_err("problem inserting idle task.\n");
1104                 thread = NULL;
1105         }
1106
1107         return thread;
1108 }
1109
1110 static void perf_session__warn_about_errors(const struct perf_session *session,
1111                                             const struct perf_tool *tool)
1112 {
1113         if (tool->lost == perf_event__process_lost &&
1114             session->hists.stats.nr_events[PERF_RECORD_LOST] != 0) {
1115                 ui__warning("Processed %d events and lost %d chunks!\n\n"
1116                             "Check IO/CPU overload!\n\n",
1117                             session->hists.stats.nr_events[0],
1118                             session->hists.stats.nr_events[PERF_RECORD_LOST]);
1119         }
1120
1121         if (session->hists.stats.nr_unknown_events != 0) {
1122                 ui__warning("Found %u unknown events!\n\n"
1123                             "Is this an older tool processing a perf.data "
1124                             "file generated by a more recent tool?\n\n"
1125                             "If that is not the case, consider "
1126                             "reporting to linux-kernel@vger.kernel.org.\n\n",
1127                             session->hists.stats.nr_unknown_events);
1128         }
1129
1130         if (session->hists.stats.nr_unknown_id != 0) {
1131                 ui__warning("%u samples with id not present in the header\n",
1132                             session->hists.stats.nr_unknown_id);
1133         }
1134
1135         if (session->hists.stats.nr_invalid_chains != 0) {
1136                 ui__warning("Found invalid callchains!\n\n"
1137                             "%u out of %u events were discarded for this reason.\n\n"
1138                             "Consider reporting to linux-kernel@vger.kernel.org.\n\n",
1139                             session->hists.stats.nr_invalid_chains,
1140                             session->hists.stats.nr_events[PERF_RECORD_SAMPLE]);
1141         }
1142
1143         if (session->hists.stats.nr_unprocessable_samples != 0) {
1144                 ui__warning("%u unprocessable samples recorded.\n"
1145                             "Do you have a KVM guest running and not using 'perf kvm'?\n",
1146                             session->hists.stats.nr_unprocessable_samples);
1147         }
1148 }
1149
1150 #define session_done()  (*(volatile int *)(&session_done))
1151 volatile int session_done;
1152
1153 static int __perf_session__process_pipe_events(struct perf_session *self,
1154                                                struct perf_tool *tool)
1155 {
1156         union perf_event *event;
1157         uint32_t size, cur_size = 0;
1158         void *buf = NULL;
1159         int skip = 0;
1160         u64 head;
1161         int err;
1162         void *p;
1163
1164         perf_tool__fill_defaults(tool);
1165
1166         head = 0;
1167         cur_size = sizeof(union perf_event);
1168
1169         buf = malloc(cur_size);
1170         if (!buf)
1171                 return -errno;
1172 more:
1173         event = buf;
1174         err = readn(self->fd, event, sizeof(struct perf_event_header));
1175         if (err <= 0) {
1176                 if (err == 0)
1177                         goto done;
1178
1179                 pr_err("failed to read event header\n");
1180                 goto out_err;
1181         }
1182
1183         if (self->header.needs_swap)
1184                 perf_event_header__bswap(&event->header);
1185
1186         size = event->header.size;
1187         if (size == 0)
1188                 size = 8;
1189
1190         if (size > cur_size) {
1191                 void *new = realloc(buf, size);
1192                 if (!new) {
1193                         pr_err("failed to allocate memory to read event\n");
1194                         goto out_err;
1195                 }
1196                 buf = new;
1197                 cur_size = size;
1198                 event = buf;
1199         }
1200         p = event;
1201         p += sizeof(struct perf_event_header);
1202
1203         if (size - sizeof(struct perf_event_header)) {
1204                 err = readn(self->fd, p, size - sizeof(struct perf_event_header));
1205                 if (err <= 0) {
1206                         if (err == 0) {
1207                                 pr_err("unexpected end of event stream\n");
1208                                 goto done;
1209                         }
1210
1211                         pr_err("failed to read event data\n");
1212                         goto out_err;
1213                 }
1214         }
1215
1216         if ((skip = perf_session__process_event(self, event, tool, head)) < 0) {
1217                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1218                        head, event->header.size, event->header.type);
1219                 err = -EINVAL;
1220                 goto out_err;
1221         }
1222
1223         head += size;
1224
1225         if (skip > 0)
1226                 head += skip;
1227
1228         if (!session_done())
1229                 goto more;
1230 done:
1231         err = 0;
1232 out_err:
1233         free(buf);
1234         perf_session__warn_about_errors(self, tool);
1235         perf_session_free_sample_buffers(self);
1236         return err;
1237 }
1238
1239 static union perf_event *
1240 fetch_mmaped_event(struct perf_session *session,
1241                    u64 head, size_t mmap_size, char *buf)
1242 {
1243         union perf_event *event;
1244
1245         /*
1246          * Ensure we have enough space remaining to read
1247          * the size of the event in the headers.
1248          */
1249         if (head + sizeof(event->header) > mmap_size)
1250                 return NULL;
1251
1252         event = (union perf_event *)(buf + head);
1253
1254         if (session->header.needs_swap)
1255                 perf_event_header__bswap(&event->header);
1256
1257         if (head + event->header.size > mmap_size)
1258                 return NULL;
1259
1260         return event;
1261 }
1262
1263 int __perf_session__process_events(struct perf_session *session,
1264                                    u64 data_offset, u64 data_size,
1265                                    u64 file_size, struct perf_tool *tool)
1266 {
1267         u64 head, page_offset, file_offset, file_pos, progress_next;
1268         int err, mmap_prot, mmap_flags, map_idx = 0;
1269         size_t  page_size, mmap_size;
1270         char *buf, *mmaps[8];
1271         union perf_event *event;
1272         uint32_t size;
1273
1274         perf_tool__fill_defaults(tool);
1275
1276         page_size = sysconf(_SC_PAGESIZE);
1277
1278         page_offset = page_size * (data_offset / page_size);
1279         file_offset = page_offset;
1280         head = data_offset - page_offset;
1281
1282         if (data_offset + data_size < file_size)
1283                 file_size = data_offset + data_size;
1284
1285         progress_next = file_size / 16;
1286
1287         mmap_size = session->mmap_window;
1288         if (mmap_size > file_size)
1289                 mmap_size = file_size;
1290
1291         memset(mmaps, 0, sizeof(mmaps));
1292
1293         mmap_prot  = PROT_READ;
1294         mmap_flags = MAP_SHARED;
1295
1296         if (session->header.needs_swap) {
1297                 mmap_prot  |= PROT_WRITE;
1298                 mmap_flags = MAP_PRIVATE;
1299         }
1300 remap:
1301         buf = mmap(NULL, mmap_size, mmap_prot, mmap_flags, session->fd,
1302                    file_offset);
1303         if (buf == MAP_FAILED) {
1304                 pr_err("failed to mmap file\n");
1305                 err = -errno;
1306                 goto out_err;
1307         }
1308         mmaps[map_idx] = buf;
1309         map_idx = (map_idx + 1) & (ARRAY_SIZE(mmaps) - 1);
1310         file_pos = file_offset + head;
1311
1312 more:
1313         event = fetch_mmaped_event(session, head, mmap_size, buf);
1314         if (!event) {
1315                 if (mmaps[map_idx]) {
1316                         munmap(mmaps[map_idx], mmap_size);
1317                         mmaps[map_idx] = NULL;
1318                 }
1319
1320                 page_offset = page_size * (head / page_size);
1321                 file_offset += page_offset;
1322                 head -= page_offset;
1323                 goto remap;
1324         }
1325
1326         size = event->header.size;
1327
1328         if (size == 0 ||
1329             perf_session__process_event(session, event, tool, file_pos) < 0) {
1330                 pr_err("%#" PRIx64 " [%#x]: failed to process type: %d\n",
1331                        file_offset + head, event->header.size,
1332                        event->header.type);
1333                 err = -EINVAL;
1334                 goto out_err;
1335         }
1336
1337         head += size;
1338         file_pos += size;
1339
1340         if (file_pos >= progress_next) {
1341                 progress_next += file_size / 16;
1342                 ui_progress__update(file_pos, file_size,
1343                                     "Processing events...");
1344         }
1345
1346         if (file_pos < file_size)
1347                 goto more;
1348
1349         err = 0;
1350         /* do the final flush for ordered samples */
1351         session->ordered_samples.next_flush = ULLONG_MAX;
1352         flush_sample_queue(session, tool);
1353 out_err:
1354         perf_session__warn_about_errors(session, tool);
1355         perf_session_free_sample_buffers(session);
1356         return err;
1357 }
1358
1359 int perf_session__process_events(struct perf_session *self,
1360                                  struct perf_tool *tool)
1361 {
1362         int err;
1363
1364         if (perf_session__register_idle_thread(self) == NULL)
1365                 return -ENOMEM;
1366
1367         if (!self->fd_pipe)
1368                 err = __perf_session__process_events(self,
1369                                                      self->header.data_offset,
1370                                                      self->header.data_size,
1371                                                      self->size, tool);
1372         else
1373                 err = __perf_session__process_pipe_events(self, tool);
1374
1375         return err;
1376 }
1377
1378 bool perf_session__has_traces(struct perf_session *self, const char *msg)
1379 {
1380         if (!(self->sample_type & PERF_SAMPLE_RAW)) {
1381                 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
1382                 return false;
1383         }
1384
1385         return true;
1386 }
1387
1388 int maps__set_kallsyms_ref_reloc_sym(struct map **maps,
1389                                      const char *symbol_name, u64 addr)
1390 {
1391         char *bracket;
1392         enum map_type i;
1393         struct ref_reloc_sym *ref;
1394
1395         ref = zalloc(sizeof(struct ref_reloc_sym));
1396         if (ref == NULL)
1397                 return -ENOMEM;
1398
1399         ref->name = strdup(symbol_name);
1400         if (ref->name == NULL) {
1401                 free(ref);
1402                 return -ENOMEM;
1403         }
1404
1405         bracket = strchr(ref->name, ']');
1406         if (bracket)
1407                 *bracket = '\0';
1408
1409         ref->addr = addr;
1410
1411         for (i = 0; i < MAP__NR_TYPES; ++i) {
1412                 struct kmap *kmap = map__kmap(maps[i]);
1413                 kmap->ref_reloc_sym = ref;
1414         }
1415
1416         return 0;
1417 }
1418
1419 size_t perf_session__fprintf_dsos(struct perf_session *self, FILE *fp)
1420 {
1421         return __dsos__fprintf(&self->host_machine.kernel_dsos, fp) +
1422                __dsos__fprintf(&self->host_machine.user_dsos, fp) +
1423                machines__fprintf_dsos(&self->machines, fp);
1424 }
1425
1426 size_t perf_session__fprintf_dsos_buildid(struct perf_session *self, FILE *fp,
1427                                           bool with_hits)
1428 {
1429         size_t ret = machine__fprintf_dsos_buildid(&self->host_machine, fp, with_hits);
1430         return ret + machines__fprintf_dsos_buildid(&self->machines, fp, with_hits);
1431 }
1432
1433 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
1434 {
1435         struct perf_evsel *pos;
1436         size_t ret = fprintf(fp, "Aggregated stats:\n");
1437
1438         ret += hists__fprintf_nr_events(&session->hists, fp);
1439
1440         list_for_each_entry(pos, &session->evlist->entries, node) {
1441                 ret += fprintf(fp, "%s stats:\n", perf_evsel__name(pos));
1442                 ret += hists__fprintf_nr_events(&pos->hists, fp);
1443         }
1444
1445         return ret;
1446 }
1447
1448 size_t perf_session__fprintf(struct perf_session *session, FILE *fp)
1449 {
1450         /*
1451          * FIXME: Here we have to actually print all the machines in this
1452          * session, not just the host...
1453          */
1454         return machine__fprintf(&session->host_machine, fp);
1455 }
1456
1457 void perf_session__remove_thread(struct perf_session *session,
1458                                  struct thread *th)
1459 {
1460         /*
1461          * FIXME: This one makes no sense, we need to remove the thread from
1462          * the machine it belongs to, perf_session can have many machines, so
1463          * doing it always on ->host_machine is wrong.  Fix when auditing all
1464          * the 'perf kvm' code.
1465          */
1466         machine__remove_thread(&session->host_machine, th);
1467 }
1468
1469 struct perf_evsel *perf_session__find_first_evtype(struct perf_session *session,
1470                                               unsigned int type)
1471 {
1472         struct perf_evsel *pos;
1473
1474         list_for_each_entry(pos, &session->evlist->entries, node) {
1475                 if (pos->attr.type == type)
1476                         return pos;
1477         }
1478         return NULL;
1479 }
1480
1481 void perf_event__print_ip(union perf_event *event, struct perf_sample *sample,
1482                           struct machine *machine, int print_sym,
1483                           int print_dso, int print_symoffset)
1484 {
1485         struct addr_location al;
1486         struct callchain_cursor_node *node;
1487
1488         if (perf_event__preprocess_sample(event, machine, &al, sample,
1489                                           NULL) < 0) {
1490                 error("problem processing %d event, skipping it.\n",
1491                         event->header.type);
1492                 return;
1493         }
1494
1495         if (symbol_conf.use_callchain && sample->callchain) {
1496
1497                 if (machine__resolve_callchain(machine, al.thread,
1498                                                 sample->callchain, NULL) != 0) {
1499                         if (verbose)
1500                                 error("Failed to resolve callchain. Skipping\n");
1501                         return;
1502                 }
1503                 callchain_cursor_commit(&callchain_cursor);
1504
1505                 while (1) {
1506                         node = callchain_cursor_current(&callchain_cursor);
1507                         if (!node)
1508                                 break;
1509
1510                         printf("\t%16" PRIx64, node->ip);
1511                         if (print_sym) {
1512                                 printf(" ");
1513                                 symbol__fprintf_symname(node->sym, stdout);
1514                         }
1515                         if (print_dso) {
1516                                 printf(" (");
1517                                 map__fprintf_dsoname(node->map, stdout);
1518                                 printf(")");
1519                         }
1520                         printf("\n");
1521
1522                         callchain_cursor_advance(&callchain_cursor);
1523                 }
1524
1525         } else {
1526                 printf("%16" PRIx64, sample->ip);
1527                 if (print_sym) {
1528                         printf(" ");
1529                         if (print_symoffset)
1530                                 symbol__fprintf_symname_offs(al.sym, &al,
1531                                                              stdout);
1532                         else
1533                                 symbol__fprintf_symname(al.sym, stdout);
1534                 }
1535
1536                 if (print_dso) {
1537                         printf(" (");
1538                         map__fprintf_dsoname(al.map, stdout);
1539                         printf(")");
1540                 }
1541         }
1542 }
1543
1544 int perf_session__cpu_bitmap(struct perf_session *session,
1545                              const char *cpu_list, unsigned long *cpu_bitmap)
1546 {
1547         int i;
1548         struct cpu_map *map;
1549
1550         for (i = 0; i < PERF_TYPE_MAX; ++i) {
1551                 struct perf_evsel *evsel;
1552
1553                 evsel = perf_session__find_first_evtype(session, i);
1554                 if (!evsel)
1555                         continue;
1556
1557                 if (!(evsel->attr.sample_type & PERF_SAMPLE_CPU)) {
1558                         pr_err("File does not contain CPU events. "
1559                                "Remove -c option to proceed.\n");
1560                         return -1;
1561                 }
1562         }
1563
1564         map = cpu_map__new(cpu_list);
1565         if (map == NULL) {
1566                 pr_err("Invalid cpu_list\n");
1567                 return -1;
1568         }
1569
1570         for (i = 0; i < map->nr; i++) {
1571                 int cpu = map->map[i];
1572
1573                 if (cpu >= MAX_NR_CPUS) {
1574                         pr_err("Requested CPU %d too large. "
1575                                "Consider raising MAX_NR_CPUS\n", cpu);
1576                         return -1;
1577                 }
1578
1579                 set_bit(cpu, cpu_bitmap);
1580         }
1581
1582         return 0;
1583 }
1584
1585 void perf_session__fprintf_info(struct perf_session *session, FILE *fp,
1586                                 bool full)
1587 {
1588         struct stat st;
1589         int ret;
1590
1591         if (session == NULL || fp == NULL)
1592                 return;
1593
1594         ret = fstat(session->fd, &st);
1595         if (ret == -1)
1596                 return;
1597
1598         fprintf(fp, "# ========\n");
1599         fprintf(fp, "# captured on: %s", ctime(&st.st_ctime));
1600         perf_header__fprintf_info(session, fp, full);
1601         fprintf(fp, "# ========\n#\n");
1602 }