tools/perf/util/session.c

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