tools/perf/util/auxtrace.c

   1 /*
   2  * auxtrace.c: AUX area trace support
   3  * Copyright (c) 2013-2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  */
  15
  16 #include <sys/types.h>
  17 #include <sys/mman.h>
  18 #include <stdbool.h>
  19
  20 #include <linux/kernel.h>
  21 #include <linux/perf_event.h>
  22 #include <linux/types.h>
  23 #include <linux/bitops.h>
  24 #include <linux/log2.h>
  25 #include <linux/string.h>
  26
  27 #include <sys/param.h>
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <limits.h>
  32 #include <errno.h>
  33 #include <linux/list.h>
  34
  35 #include "../perf.h"
  36 #include "util.h"
  37 #include "evlist.h"
  38 #include "cpumap.h"
  39 #include "thread_map.h"
  40 #include "asm/bug.h"
  41 #include "auxtrace.h"
  42
  43 #include <linux/hash.h>
  44
  45 #include "event.h"
  46 #include "session.h"
  47 #include "debug.h"
  48 #include "parse-options.h"
  49
  50 #include "intel-pt.h"
  51 #include "intel-bts.h"
  52
  53 int auxtrace_mmap__mmap(struct auxtrace_mmap *mm,
  54                         struct auxtrace_mmap_params *mp,
  55                         void *userpg, int fd)
  56 {
  57         struct perf_event_mmap_page *pc = userpg;
  58
  59         WARN_ONCE(mm->base, "Uninitialized auxtrace_mmap\n");
  60
  61         mm->userpg = userpg;
  62         mm->mask = mp->mask;
  63         mm->len = mp->len;
  64         mm->prev = 0;
  65         mm->idx = mp->idx;
  66         mm->tid = mp->tid;
  67         mm->cpu = mp->cpu;
  68
  69         if (!mp->len) {
  70                 mm->base = NULL;
  71                 return 0;
  72         }
  73
  74 #if BITS_PER_LONG != 64 && !defined(HAVE_SYNC_COMPARE_AND_SWAP_SUPPORT)
  75         pr_err("Cannot use AUX area tracing mmaps\n");
  76         return -1;
  77 #endif
  78
  79         pc->aux_offset = mp->offset;
  80         pc->aux_size = mp->len;
  81
  82         mm->base = mmap(NULL, mp->len, mp->prot, MAP_SHARED, fd, mp->offset);
  83         if (mm->base == MAP_FAILED) {
  84                 pr_debug2("failed to mmap AUX area\n");
  85                 mm->base = NULL;
  86                 return -1;
  87         }
  88
  89         return 0;
  90 }
  91
  92 void auxtrace_mmap__munmap(struct auxtrace_mmap *mm)
  93 {
  94         if (mm->base) {
  95                 munmap(mm->base, mm->len);
  96                 mm->base = NULL;
  97         }
  98 }
  99
 100 void auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp,
 101                                 off_t auxtrace_offset,
 102                                 unsigned int auxtrace_pages,
 103                                 bool auxtrace_overwrite)
 104 {
 105         if (auxtrace_pages) {
 106                 mp->offset = auxtrace_offset;
 107                 mp->len = auxtrace_pages * (size_t)page_size;
 108                 mp->mask = is_power_of_2(mp->len) ? mp->len - 1 : 0;
 109                 mp->prot = PROT_READ | (auxtrace_overwrite ? 0 : PROT_WRITE);
 110                 pr_debug2("AUX area mmap length %zu\n", mp->len);
 111         } else {
 112                 mp->len = 0;
 113         }
 114 }
 115
 116 void auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp,
 117                                    struct perf_evlist *evlist, int idx,
 118                                    bool per_cpu)
 119 {
 120         mp->idx = idx;
 121
 122         if (per_cpu) {
 123                 mp->cpu = evlist->cpus->map[idx];
 124                 if (evlist->threads)
 125                         mp->tid = thread_map__pid(evlist->threads, 0);
 126                 else
 127                         mp->tid = -1;
 128         } else {
 129                 mp->cpu = -1;
 130                 mp->tid = thread_map__pid(evlist->threads, idx);
 131         }
 132 }
 133
 134 #define AUXTRACE_INIT_NR_QUEUES 32
 135
 136 static struct auxtrace_queue *auxtrace_alloc_queue_array(unsigned int nr_queues)
 137 {
 138         struct auxtrace_queue *queue_array;
 139         unsigned int max_nr_queues, i;
 140
 141         max_nr_queues = UINT_MAX / sizeof(struct auxtrace_queue);
 142         if (nr_queues > max_nr_queues)
 143                 return NULL;
 144
 145         queue_array = calloc(nr_queues, sizeof(struct auxtrace_queue));
 146         if (!queue_array)
 147                 return NULL;
 148
 149         for (i = 0; i < nr_queues; i++) {
 150                 INIT_LIST_HEAD(&queue_array[i].head);
 151                 queue_array[i].priv = NULL;
 152         }
 153
 154         return queue_array;
 155 }
 156
 157 int auxtrace_queues__init(struct auxtrace_queues *queues)
 158 {
 159         queues->nr_queues = AUXTRACE_INIT_NR_QUEUES;
 160         queues->queue_array = auxtrace_alloc_queue_array(queues->nr_queues);
 161         if (!queues->queue_array)
 162                 return -ENOMEM;
 163         return 0;
 164 }
 165
 166 static int auxtrace_queues__grow(struct auxtrace_queues *queues,
 167                                  unsigned int new_nr_queues)
 168 {
 169         unsigned int nr_queues = queues->nr_queues;
 170         struct auxtrace_queue *queue_array;
 171         unsigned int i;
 172
 173         if (!nr_queues)
 174                 nr_queues = AUXTRACE_INIT_NR_QUEUES;
 175
 176         while (nr_queues && nr_queues < new_nr_queues)
 177                 nr_queues <<= 1;
 178
 179         if (nr_queues < queues->nr_queues || nr_queues < new_nr_queues)
 180                 return -EINVAL;
 181
 182         queue_array = auxtrace_alloc_queue_array(nr_queues);
 183         if (!queue_array)
 184                 return -ENOMEM;
 185
 186         for (i = 0; i < queues->nr_queues; i++) {
 187                 list_splice_tail(&queues->queue_array[i].head,
 188                                  &queue_array[i].head);
 189                 queue_array[i].priv = queues->queue_array[i].priv;
 190         }
 191
 192         queues->nr_queues = nr_queues;
 193         queues->queue_array = queue_array;
 194
 195         return 0;
 196 }
 197
 198 static void *auxtrace_copy_data(u64 size, struct perf_session *session)
 199 {
 200         int fd = perf_data_file__fd(session->file);
 201         void *p;
 202         ssize_t ret;
 203
 204         if (size > SSIZE_MAX)
 205                 return NULL;
 206
 207         p = malloc(size);
 208         if (!p)
 209                 return NULL;
 210
 211         ret = readn(fd, p, size);
 212         if (ret != (ssize_t)size) {
 213                 free(p);
 214                 return NULL;
 215         }
 216
 217         return p;
 218 }
 219
 220 static int auxtrace_queues__add_buffer(struct auxtrace_queues *queues,
 221                                        unsigned int idx,
 222                                        struct auxtrace_buffer *buffer)
 223 {
 224         struct auxtrace_queue *queue;
 225         int err;
 226
 227         if (idx >= queues->nr_queues) {
 228                 err = auxtrace_queues__grow(queues, idx + 1);
 229                 if (err)
 230                         return err;
 231         }
 232
 233         queue = &queues->queue_array[idx];
 234
 235         if (!queue->set) {
 236                 queue->set = true;
 237                 queue->tid = buffer->tid;
 238                 queue->cpu = buffer->cpu;
 239         } else if (buffer->cpu != queue->cpu || buffer->tid != queue->tid) {
 240                 pr_err("auxtrace queue conflict: cpu %d, tid %d vs cpu %d, tid %d\n",
 241                        queue->cpu, queue->tid, buffer->cpu, buffer->tid);
 242                 return -EINVAL;
 243         }
 244
 245         buffer->buffer_nr = queues->next_buffer_nr++;
 246
 247         list_add_tail(&buffer->list, &queue->head);
 248
 249         queues->new_data = true;
 250         queues->populated = true;
 251
 252         return 0;
 253 }
 254
 255 /* Limit buffers to 32MiB on 32-bit */
 256 #define BUFFER_LIMIT_FOR_32_BIT (32 * 1024 * 1024)
 257
 258 static int auxtrace_queues__split_buffer(struct auxtrace_queues *queues,
 259                                          unsigned int idx,
 260                                          struct auxtrace_buffer *buffer)
 261 {
 262         u64 sz = buffer->size;
 263         bool consecutive = false;
 264         struct auxtrace_buffer *b;
 265         int err;
 266
 267         while (sz > BUFFER_LIMIT_FOR_32_BIT) {
 268                 b = memdup(buffer, sizeof(struct auxtrace_buffer));
 269                 if (!b)
 270                         return -ENOMEM;
 271                 b->size = BUFFER_LIMIT_FOR_32_BIT;
 272                 b->consecutive = consecutive;
 273                 err = auxtrace_queues__add_buffer(queues, idx, b);
 274                 if (err) {
 275                         auxtrace_buffer__free(b);
 276                         return err;
 277                 }
 278                 buffer->data_offset += BUFFER_LIMIT_FOR_32_BIT;
 279                 sz -= BUFFER_LIMIT_FOR_32_BIT;
 280                 consecutive = true;
 281         }
 282
 283         buffer->size = sz;
 284         buffer->consecutive = consecutive;
 285
 286         return 0;
 287 }
 288
 289 static int auxtrace_queues__add_event_buffer(struct auxtrace_queues *queues,
 290                                              struct perf_session *session,
 291                                              unsigned int idx,
 292                                              struct auxtrace_buffer *buffer)
 293 {
 294         if (session->one_mmap) {
 295                 buffer->data = buffer->data_offset - session->one_mmap_offset +
 296                                session->one_mmap_addr;
 297         } else if (perf_data_file__is_pipe(session->file)) {
 298                 buffer->data = auxtrace_copy_data(buffer->size, session);
 299                 if (!buffer->data)
 300                         return -ENOMEM;
 301                 buffer->data_needs_freeing = true;
 302         } else if (BITS_PER_LONG == 32 &&
 303                    buffer->size > BUFFER_LIMIT_FOR_32_BIT) {
 304                 int err;
 305
 306                 err = auxtrace_queues__split_buffer(queues, idx, buffer);
 307                 if (err)
 308                         return err;
 309         }
 310
 311         return auxtrace_queues__add_buffer(queues, idx, buffer);
 312 }
 313
 314 int auxtrace_queues__add_event(struct auxtrace_queues *queues,
 315                                struct perf_session *session,
 316                                union perf_event *event, off_t data_offset,
 317                                struct auxtrace_buffer **buffer_ptr)
 318 {
 319         struct auxtrace_buffer *buffer;
 320         unsigned int idx;
 321         int err;
 322
 323         buffer = zalloc(sizeof(struct auxtrace_buffer));
 324         if (!buffer)
 325                 return -ENOMEM;
 326
 327         buffer->pid = -1;
 328         buffer->tid = event->auxtrace.tid;
 329         buffer->cpu = event->auxtrace.cpu;
 330         buffer->data_offset = data_offset;
 331         buffer->offset = event->auxtrace.offset;
 332         buffer->reference = event->auxtrace.reference;
 333         buffer->size = event->auxtrace.size;
 334         idx = event->auxtrace.idx;
 335
 336         err = auxtrace_queues__add_event_buffer(queues, session, idx, buffer);
 337         if (err)
 338                 goto out_err;
 339
 340         if (buffer_ptr)
 341                 *buffer_ptr = buffer;
 342
 343         return 0;
 344
 345 out_err:
 346         auxtrace_buffer__free(buffer);
 347         return err;
 348 }
 349
 350 static int auxtrace_queues__add_indexed_event(struct auxtrace_queues *queues,
 351                                               struct perf_session *session,
 352                                               off_t file_offset, size_t sz)
 353 {
 354         union perf_event *event;
 355         int err;
 356         char buf[PERF_SAMPLE_MAX_SIZE];
 357
 358         err = perf_session__peek_event(session, file_offset, buf,
 359                                        PERF_SAMPLE_MAX_SIZE, &event, NULL);
 360         if (err)
 361                 return err;
 362
 363         if (event->header.type == PERF_RECORD_AUXTRACE) {
 364                 if (event->header.size < sizeof(struct auxtrace_event) ||
 365                     event->header.size != sz) {
 366                         err = -EINVAL;
 367                         goto out;
 368                 }
 369                 file_offset += event->header.size;
 370                 err = auxtrace_queues__add_event(queues, session, event,
 371                                                  file_offset, NULL);
 372         }
 373 out:
 374         return err;
 375 }
 376
 377 void auxtrace_queues__free(struct auxtrace_queues *queues)
 378 {
 379         unsigned int i;
 380
 381         for (i = 0; i < queues->nr_queues; i++) {
 382                 while (!list_empty(&queues->queue_array[i].head)) {
 383                         struct auxtrace_buffer *buffer;
 384
 385                         buffer = list_entry(queues->queue_array[i].head.next,
 386                                             struct auxtrace_buffer, list);
 387                         list_del(&buffer->list);
 388                         auxtrace_buffer__free(buffer);
 389                 }
 390         }
 391
 392         zfree(&queues->queue_array);
 393         queues->nr_queues = 0;
 394 }
 395
 396 static void auxtrace_heapify(struct auxtrace_heap_item *heap_array,
 397                              unsigned int pos, unsigned int queue_nr,
 398                              u64 ordinal)
 399 {
 400         unsigned int parent;
 401
 402         while (pos) {
 403                 parent = (pos - 1) >> 1;
 404                 if (heap_array[parent].ordinal <= ordinal)
 405                         break;
 406                 heap_array[pos] = heap_array[parent];
 407                 pos = parent;
 408         }
 409         heap_array[pos].queue_nr = queue_nr;
 410         heap_array[pos].ordinal = ordinal;
 411 }
 412
 413 int auxtrace_heap__add(struct auxtrace_heap *heap, unsigned int queue_nr,
 414                        u64 ordinal)
 415 {
 416         struct auxtrace_heap_item *heap_array;
 417
 418         if (queue_nr >= heap->heap_sz) {
 419                 unsigned int heap_sz = AUXTRACE_INIT_NR_QUEUES;
 420
 421                 while (heap_sz <= queue_nr)
 422                         heap_sz <<= 1;
 423                 heap_array = realloc(heap->heap_array,
 424                                      heap_sz * sizeof(struct auxtrace_heap_item));
 425                 if (!heap_array)
 426                         return -ENOMEM;
 427                 heap->heap_array = heap_array;
 428                 heap->heap_sz = heap_sz;
 429         }
 430
 431         auxtrace_heapify(heap->heap_array, heap->heap_cnt++, queue_nr, ordinal);
 432
 433         return 0;
 434 }
 435
 436 void auxtrace_heap__free(struct auxtrace_heap *heap)
 437 {
 438         zfree(&heap->heap_array);
 439         heap->heap_cnt = 0;
 440         heap->heap_sz = 0;
 441 }
 442
 443 void auxtrace_heap__pop(struct auxtrace_heap *heap)
 444 {
 445         unsigned int pos, last, heap_cnt = heap->heap_cnt;
 446         struct auxtrace_heap_item *heap_array;
 447
 448         if (!heap_cnt)
 449                 return;
 450
 451         heap->heap_cnt -= 1;
 452
 453         heap_array = heap->heap_array;
 454
 455         pos = 0;
 456         while (1) {
 457                 unsigned int left, right;
 458
 459                 left = (pos << 1) + 1;
 460                 if (left >= heap_cnt)
 461                         break;
 462                 right = left + 1;
 463                 if (right >= heap_cnt) {
 464                         heap_array[pos] = heap_array[left];
 465                         return;
 466                 }
 467                 if (heap_array[left].ordinal < heap_array[right].ordinal) {
 468                         heap_array[pos] = heap_array[left];
 469                         pos = left;
 470                 } else {
 471                         heap_array[pos] = heap_array[right];
 472                         pos = right;
 473                 }
 474         }
 475
 476         last = heap_cnt - 1;
 477         auxtrace_heapify(heap_array, pos, heap_array[last].queue_nr,
 478                          heap_array[last].ordinal);
 479 }
 480
 481 size_t auxtrace_record__info_priv_size(struct auxtrace_record *itr)
 482 {
 483         if (itr)
 484                 return itr->info_priv_size(itr);
 485         return 0;
 486 }
 487
 488 static int auxtrace_not_supported(void)
 489 {
 490         pr_err("AUX area tracing is not supported on this architecture\n");
 491         return -EINVAL;
 492 }
 493
 494 int auxtrace_record__info_fill(struct auxtrace_record *itr,
 495                                struct perf_session *session,
 496                                struct auxtrace_info_event *auxtrace_info,
 497                                size_t priv_size)
 498 {
 499         if (itr)
 500                 return itr->info_fill(itr, session, auxtrace_info, priv_size);
 501         return auxtrace_not_supported();
 502 }
 503
 504 void auxtrace_record__free(struct auxtrace_record *itr)
 505 {
 506         if (itr)
 507                 itr->free(itr);
 508 }
 509
 510 int auxtrace_record__snapshot_start(struct auxtrace_record *itr)
 511 {
 512         if (itr && itr->snapshot_start)
 513                 return itr->snapshot_start(itr);
 514         return 0;
 515 }
 516
 517 int auxtrace_record__snapshot_finish(struct auxtrace_record *itr)
 518 {
 519         if (itr && itr->snapshot_finish)
 520                 return itr->snapshot_finish(itr);
 521         return 0;
 522 }
 523
 524 int auxtrace_record__find_snapshot(struct auxtrace_record *itr, int idx,
 525                                    struct auxtrace_mmap *mm,
 526                                    unsigned char *data, u64 *head, u64 *old)
 527 {
 528         if (itr && itr->find_snapshot)
 529                 return itr->find_snapshot(itr, idx, mm, data, head, old);
 530         return 0;
 531 }
 532
 533 int auxtrace_record__options(struct auxtrace_record *itr,
 534                              struct perf_evlist *evlist,
 535                              struct record_opts *opts)
 536 {
 537         if (itr)
 538                 return itr->recording_options(itr, evlist, opts);
 539         return 0;
 540 }
 541
 542 u64 auxtrace_record__reference(struct auxtrace_record *itr)
 543 {
 544         if (itr)
 545                 return itr->reference(itr);
 546         return 0;
 547 }
 548
 549 int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
 550                                     struct record_opts *opts, const char *str)
 551 {
 552         if (!str)
 553                 return 0;
 554
 555         if (itr)
 556                 return itr->parse_snapshot_options(itr, opts, str);
 557
 558         pr_err("No AUX area tracing to snapshot\n");
 559         return -EINVAL;
 560 }
 561
 562 struct auxtrace_record *__weak
 563 auxtrace_record__init(struct perf_evlist *evlist __maybe_unused, int *err)
 564 {
 565         *err = 0;
 566         return NULL;
 567 }
 568
 569 static int auxtrace_index__alloc(struct list_head *head)
 570 {
 571         struct auxtrace_index *auxtrace_index;
 572
 573         auxtrace_index = malloc(sizeof(struct auxtrace_index));
 574         if (!auxtrace_index)
 575                 return -ENOMEM;
 576
 577         auxtrace_index->nr = 0;
 578         INIT_LIST_HEAD(&auxtrace_index->list);
 579
 580         list_add_tail(&auxtrace_index->list, head);
 581
 582         return 0;
 583 }
 584
 585 void auxtrace_index__free(struct list_head *head)
 586 {
 587         struct auxtrace_index *auxtrace_index, *n;
 588
 589         list_for_each_entry_safe(auxtrace_index, n, head, list) {
 590                 list_del(&auxtrace_index->list);
 591                 free(auxtrace_index);
 592         }
 593 }
 594
 595 static struct auxtrace_index *auxtrace_index__last(struct list_head *head)
 596 {
 597         struct auxtrace_index *auxtrace_index;
 598         int err;
 599
 600         if (list_empty(head)) {
 601                 err = auxtrace_index__alloc(head);
 602                 if (err)
 603                         return NULL;
 604         }
 605
 606         auxtrace_index = list_entry(head->prev, struct auxtrace_index, list);
 607
 608         if (auxtrace_index->nr >= PERF_AUXTRACE_INDEX_ENTRY_COUNT) {
 609                 err = auxtrace_index__alloc(head);
 610                 if (err)
 611                         return NULL;
 612                 auxtrace_index = list_entry(head->prev, struct auxtrace_index,
 613                                             list);
 614         }
 615
 616         return auxtrace_index;
 617 }
 618
 619 int auxtrace_index__auxtrace_event(struct list_head *head,
 620                                    union perf_event *event, off_t file_offset)
 621 {
 622         struct auxtrace_index *auxtrace_index;
 623         size_t nr;
 624
 625         auxtrace_index = auxtrace_index__last(head);
 626         if (!auxtrace_index)
 627                 return -ENOMEM;
 628
 629         nr = auxtrace_index->nr;
 630         auxtrace_index->entries[nr].file_offset = file_offset;
 631         auxtrace_index->entries[nr].sz = event->header.size;
 632         auxtrace_index->nr += 1;
 633
 634         return 0;
 635 }
 636
 637 static int auxtrace_index__do_write(int fd,
 638                                     struct auxtrace_index *auxtrace_index)
 639 {
 640         struct auxtrace_index_entry ent;
 641         size_t i;
 642
 643         for (i = 0; i < auxtrace_index->nr; i++) {
 644                 ent.file_offset = auxtrace_index->entries[i].file_offset;
 645                 ent.sz = auxtrace_index->entries[i].sz;
 646                 if (writen(fd, &ent, sizeof(ent)) != sizeof(ent))
 647                         return -errno;
 648         }
 649         return 0;
 650 }
 651
 652 int auxtrace_index__write(int fd, struct list_head *head)
 653 {
 654         struct auxtrace_index *auxtrace_index;
 655         u64 total = 0;
 656         int err;
 657
 658         list_for_each_entry(auxtrace_index, head, list)
 659                 total += auxtrace_index->nr;
 660
 661         if (writen(fd, &total, sizeof(total)) != sizeof(total))
 662                 return -errno;
 663
 664         list_for_each_entry(auxtrace_index, head, list) {
 665                 err = auxtrace_index__do_write(fd, auxtrace_index);
 666                 if (err)
 667                         return err;
 668         }
 669
 670         return 0;
 671 }
 672
 673 static int auxtrace_index__process_entry(int fd, struct list_head *head,
 674                                          bool needs_swap)
 675 {
 676         struct auxtrace_index *auxtrace_index;
 677         struct auxtrace_index_entry ent;
 678         size_t nr;
 679
 680         if (readn(fd, &ent, sizeof(ent)) != sizeof(ent))
 681                 return -1;
 682
 683         auxtrace_index = auxtrace_index__last(head);
 684         if (!auxtrace_index)
 685                 return -1;
 686
 687         nr = auxtrace_index->nr;
 688         if (needs_swap) {
 689                 auxtrace_index->entries[nr].file_offset =
 690                                                 bswap_64(ent.file_offset);
 691                 auxtrace_index->entries[nr].sz = bswap_64(ent.sz);
 692         } else {
 693                 auxtrace_index->entries[nr].file_offset = ent.file_offset;
 694                 auxtrace_index->entries[nr].sz = ent.sz;
 695         }
 696
 697         auxtrace_index->nr = nr + 1;
 698
 699         return 0;
 700 }
 701
 702 int auxtrace_index__process(int fd, u64 size, struct perf_session *session,
 703                             bool needs_swap)
 704 {
 705         struct list_head *head = &session->auxtrace_index;
 706         u64 nr;
 707
 708         if (readn(fd, &nr, sizeof(u64)) != sizeof(u64))
 709                 return -1;
 710
 711         if (needs_swap)
 712                 nr = bswap_64(nr);
 713
 714         if (sizeof(u64) + nr * sizeof(struct auxtrace_index_entry) > size)
 715                 return -1;
 716
 717         while (nr--) {
 718                 int err;
 719
 720                 err = auxtrace_index__process_entry(fd, head, needs_swap);
 721                 if (err)
 722                         return -1;
 723         }
 724
 725         return 0;
 726 }
 727
 728 static int auxtrace_queues__process_index_entry(struct auxtrace_queues *queues,
 729                                                 struct perf_session *session,
 730                                                 struct auxtrace_index_entry *ent)
 731 {
 732         return auxtrace_queues__add_indexed_event(queues, session,
 733                                                   ent->file_offset, ent->sz);
 734 }
 735
 736 int auxtrace_queues__process_index(struct auxtrace_queues *queues,
 737                                    struct perf_session *session)
 738 {
 739         struct auxtrace_index *auxtrace_index;
 740         struct auxtrace_index_entry *ent;
 741         size_t i;
 742         int err;
 743
 744         list_for_each_entry(auxtrace_index, &session->auxtrace_index, list) {
 745                 for (i = 0; i < auxtrace_index->nr; i++) {
 746                         ent = &auxtrace_index->entries[i];
 747                         err = auxtrace_queues__process_index_entry(queues,
 748                                                                    session,
 749                                                                    ent);
 750                         if (err)
 751                                 return err;
 752                 }
 753         }
 754         return 0;
 755 }
 756
 757 struct auxtrace_buffer *auxtrace_buffer__next(struct auxtrace_queue *queue,
 758                                               struct auxtrace_buffer *buffer)
 759 {
 760         if (buffer) {
 761                 if (list_is_last(&buffer->list, &queue->head))
 762                         return NULL;
 763                 return list_entry(buffer->list.next, struct auxtrace_buffer,
 764                                   list);
 765         } else {
 766                 if (list_empty(&queue->head))
 767                         return NULL;
 768                 return list_entry(queue->head.next, struct auxtrace_buffer,
 769                                   list);
 770         }
 771 }
 772
 773 void *auxtrace_buffer__get_data(struct auxtrace_buffer *buffer, int fd)
 774 {
 775         size_t adj = buffer->data_offset & (page_size - 1);
 776         size_t size = buffer->size + adj;
 777         off_t file_offset = buffer->data_offset - adj;
 778         void *addr;
 779
 780         if (buffer->data)
 781                 return buffer->data;
 782
 783         addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, file_offset);
 784         if (addr == MAP_FAILED)
 785                 return NULL;
 786
 787         buffer->mmap_addr = addr;
 788         buffer->mmap_size = size;
 789
 790         buffer->data = addr + adj;
 791
 792         return buffer->data;
 793 }
 794
 795 void auxtrace_buffer__put_data(struct auxtrace_buffer *buffer)
 796 {
 797         if (!buffer->data || !buffer->mmap_addr)
 798                 return;
 799         munmap(buffer->mmap_addr, buffer->mmap_size);
 800         buffer->mmap_addr = NULL;
 801         buffer->mmap_size = 0;
 802         buffer->data = NULL;
 803         buffer->use_data = NULL;
 804 }
 805
 806 void auxtrace_buffer__drop_data(struct auxtrace_buffer *buffer)
 807 {
 808         auxtrace_buffer__put_data(buffer);
 809         if (buffer->data_needs_freeing) {
 810                 buffer->data_needs_freeing = false;
 811                 zfree(&buffer->data);
 812                 buffer->use_data = NULL;
 813                 buffer->size = 0;
 814         }
 815 }
 816
 817 void auxtrace_buffer__free(struct auxtrace_buffer *buffer)
 818 {
 819         auxtrace_buffer__drop_data(buffer);
 820         free(buffer);
 821 }
 822
 823 void auxtrace_synth_error(struct auxtrace_error_event *auxtrace_error, int type,
 824                           int code, int cpu, pid_t pid, pid_t tid, u64 ip,
 825                           const char *msg)
 826 {
 827         size_t size;
 828
 829         memset(auxtrace_error, 0, sizeof(struct auxtrace_error_event));
 830
 831         auxtrace_error->header.type = PERF_RECORD_AUXTRACE_ERROR;
 832         auxtrace_error->type = type;
 833         auxtrace_error->code = code;
 834         auxtrace_error->cpu = cpu;
 835         auxtrace_error->pid = pid;
 836         auxtrace_error->tid = tid;
 837         auxtrace_error->ip = ip;
 838         strlcpy(auxtrace_error->msg, msg, MAX_AUXTRACE_ERROR_MSG);
 839
 840         size = (void *)auxtrace_error->msg - (void *)auxtrace_error +
 841                strlen(auxtrace_error->msg) + 1;
 842         auxtrace_error->header.size = PERF_ALIGN(size, sizeof(u64));
 843 }
 844
 845 int perf_event__synthesize_auxtrace_info(struct auxtrace_record *itr,
 846                                          struct perf_tool *tool,
 847                                          struct perf_session *session,
 848                                          perf_event__handler_t process)
 849 {
 850         union perf_event *ev;
 851         size_t priv_size;
 852         int err;
 853
 854         pr_debug2("Synthesizing auxtrace information\n");
 855         priv_size = auxtrace_record__info_priv_size(itr);
 856         ev = zalloc(sizeof(struct auxtrace_info_event) + priv_size);
 857         if (!ev)
 858                 return -ENOMEM;
 859
 860         ev->auxtrace_info.header.type = PERF_RECORD_AUXTRACE_INFO;
 861         ev->auxtrace_info.header.size = sizeof(struct auxtrace_info_event) +
 862                                         priv_size;
 863         err = auxtrace_record__info_fill(itr, session, &ev->auxtrace_info,
 864                                          priv_size);
 865         if (err)
 866                 goto out_free;
 867
 868         err = process(tool, ev, NULL, NULL);
 869 out_free:
 870         free(ev);
 871         return err;
 872 }
 873
 874 static bool auxtrace__dont_decode(struct perf_session *session)
 875 {
 876         return !session->itrace_synth_opts ||
 877                session->itrace_synth_opts->dont_decode;
 878 }
 879
 880 int perf_event__process_auxtrace_info(struct perf_tool *tool __maybe_unused,
 881                                       union perf_event *event,
 882                                       struct perf_session *session)
 883 {
 884         enum auxtrace_type type = event->auxtrace_info.type;
 885
 886         if (dump_trace)
 887                 fprintf(stdout, " type: %u\n", type);
 888
 889         switch (type) {
 890         case PERF_AUXTRACE_INTEL_PT:
 891                 return intel_pt_process_auxtrace_info(event, session);
 892         case PERF_AUXTRACE_INTEL_BTS:
 893                 return intel_bts_process_auxtrace_info(event, session);
 894         case PERF_AUXTRACE_UNKNOWN:
 895         default:
 896                 return -EINVAL;
 897         }
 898 }
 899
 900 s64 perf_event__process_auxtrace(struct perf_tool *tool,
 901                                  union perf_event *event,
 902                                  struct perf_session *session)
 903 {
 904         s64 err;
 905
 906         if (dump_trace)
 907                 fprintf(stdout, " size: %#"PRIx64"  offset: %#"PRIx64"  ref: %#"PRIx64"  idx: %u  tid: %d  cpu: %d\n",
 908                         event->auxtrace.size, event->auxtrace.offset,
 909                         event->auxtrace.reference, event->auxtrace.idx,
 910                         event->auxtrace.tid, event->auxtrace.cpu);
 911
 912         if (auxtrace__dont_decode(session))
 913                 return event->auxtrace.size;
 914
 915         if (!session->auxtrace || event->header.type != PERF_RECORD_AUXTRACE)
 916                 return -EINVAL;
 917
 918         err = session->auxtrace->process_auxtrace_event(session, event, tool);
 919         if (err < 0)
 920                 return err;
 921
 922         return event->auxtrace.size;
 923 }
 924
 925 #define PERF_ITRACE_DEFAULT_PERIOD_TYPE         PERF_ITRACE_PERIOD_NANOSECS
 926 #define PERF_ITRACE_DEFAULT_PERIOD              100000
 927 #define PERF_ITRACE_DEFAULT_CALLCHAIN_SZ        16
 928 #define PERF_ITRACE_MAX_CALLCHAIN_SZ            1024
 929
 930 void itrace_synth_opts__set_default(struct itrace_synth_opts *synth_opts)
 931 {
 932         synth_opts->instructions = true;
 933         synth_opts->branches = true;
 934         synth_opts->transactions = true;
 935         synth_opts->errors = true;
 936         synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE;
 937         synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
 938         synth_opts->callchain_sz = PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
 939 }
 940
 941 /*
 942  * Please check tools/perf/Documentation/perf-script.txt for information
 943  * about the options parsed here, which is introduced after this cset,
 944  * when support in 'perf script' for these options is introduced.
 945  */
 946 int itrace_parse_synth_opts(const struct option *opt, const char *str,
 947                             int unset)
 948 {
 949         struct itrace_synth_opts *synth_opts = opt->value;
 950         const char *p;
 951         char *endptr;
 952         bool period_type_set = false;
 953         bool period_set = false;
 954
 955         synth_opts->set = true;
 956
 957         if (unset) {
 958                 synth_opts->dont_decode = true;
 959                 return 0;
 960         }
 961
 962         if (!str) {
 963                 itrace_synth_opts__set_default(synth_opts);
 964                 return 0;
 965         }
 966
 967         for (p = str; *p;) {
 968                 switch (*p++) {
 969                 case 'i':
 970                         synth_opts->instructions = true;
 971                         while (*p == ' ' || *p == ',')
 972                                 p += 1;
 973                         if (isdigit(*p)) {
 974                                 synth_opts->period = strtoull(p, &endptr, 10);
 975                                 period_set = true;
 976                                 p = endptr;
 977                                 while (*p == ' ' || *p == ',')
 978                                         p += 1;
 979                                 switch (*p++) {
 980                                 case 'i':
 981                                         synth_opts->period_type =
 982                                                 PERF_ITRACE_PERIOD_INSTRUCTIONS;
 983                                         period_type_set = true;
 984                                         break;
 985                                 case 't':
 986                                         synth_opts->period_type =
 987                                                 PERF_ITRACE_PERIOD_TICKS;
 988                                         period_type_set = true;
 989                                         break;
 990                                 case 'm':
 991                                         synth_opts->period *= 1000;
 992                                         /* Fall through */
 993                                 case 'u':
 994                                         synth_opts->period *= 1000;
 995                                         /* Fall through */
 996                                 case 'n':
 997                                         if (*p++ != 's')
 998                                                 goto out_err;
 999                                         synth_opts->period_type =
1000                                                 PERF_ITRACE_PERIOD_NANOSECS;
1001                                         period_type_set = true;
1002                                         break;
1003                                 case '\0':
1004                                         goto out;
1005                                 default:
1006                                         goto out_err;
1007                                 }
1008                         }
1009                         break;
1010                 case 'b':
1011                         synth_opts->branches = true;
1012                         break;
1013                 case 'x':
1014                         synth_opts->transactions = true;
1015                         break;
1016                 case 'e':
1017                         synth_opts->errors = true;
1018                         break;
1019                 case 'd':
1020                         synth_opts->log = true;
1021                         break;
1022                 case 'c':
1023                         synth_opts->branches = true;
1024                         synth_opts->calls = true;
1025                         break;
1026                 case 'r':
1027                         synth_opts->branches = true;
1028                         synth_opts->returns = true;
1029                         break;
1030                 case 'g':
1031                         synth_opts->callchain = true;
1032                         synth_opts->callchain_sz =
1033                                         PERF_ITRACE_DEFAULT_CALLCHAIN_SZ;
1034                         while (*p == ' ' || *p == ',')
1035                                 p += 1;
1036                         if (isdigit(*p)) {
1037                                 unsigned int val;
1038
1039                                 val = strtoul(p, &endptr, 10);
1040                                 p = endptr;
1041                                 if (!val || val > PERF_ITRACE_MAX_CALLCHAIN_SZ)
1042                                         goto out_err;
1043                                 synth_opts->callchain_sz = val;
1044                         }
1045                         break;
1046                 case ' ':
1047                 case ',':
1048                         break;
1049                 default:
1050                         goto out_err;
1051                 }
1052         }
1053 out:
1054         if (synth_opts->instructions) {
1055                 if (!period_type_set)
1056                         synth_opts->period_type =
1057                                         PERF_ITRACE_DEFAULT_PERIOD_TYPE;
1058                 if (!period_set)
1059                         synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD;
1060         }
1061
1062         return 0;
1063
1064 out_err:
1065         pr_err("Bad Instruction Tracing options '%s'\n", str);
1066         return -EINVAL;
1067 }
1068
1069 static const char * const auxtrace_error_type_name[] = {
1070         [PERF_AUXTRACE_ERROR_ITRACE] = "instruction trace",
1071 };
1072
1073 static const char *auxtrace_error_name(int type)
1074 {
1075         const char *error_type_name = NULL;
1076
1077         if (type < PERF_AUXTRACE_ERROR_MAX)
1078                 error_type_name = auxtrace_error_type_name[type];
1079         if (!error_type_name)
1080                 error_type_name = "unknown AUX";
1081         return error_type_name;
1082 }
1083
1084 size_t perf_event__fprintf_auxtrace_error(union perf_event *event, FILE *fp)
1085 {
1086         struct auxtrace_error_event *e = &event->auxtrace_error;
1087         int ret;
1088
1089         ret = fprintf(fp, " %s error type %u",
1090                       auxtrace_error_name(e->type), e->type);
1091         ret += fprintf(fp, " cpu %d pid %d tid %d ip %#"PRIx64" code %u: %s\n",
1092                        e->cpu, e->pid, e->tid, e->ip, e->code, e->msg);
1093         return ret;
1094 }
1095
1096 void perf_session__auxtrace_error_inc(struct perf_session *session,
1097                                       union perf_event *event)
1098 {
1099         struct auxtrace_error_event *e = &event->auxtrace_error;
1100
1101         if (e->type < PERF_AUXTRACE_ERROR_MAX)
1102                 session->evlist->stats.nr_auxtrace_errors[e->type] += 1;
1103 }
1104
1105 void events_stats__auxtrace_error_warn(const struct events_stats *stats)
1106 {
1107         int i;
1108
1109         for (i = 0; i < PERF_AUXTRACE_ERROR_MAX; i++) {
1110                 if (!stats->nr_auxtrace_errors[i])
1111                         continue;
1112                 ui__warning("%u %s errors\n",
1113                             stats->nr_auxtrace_errors[i],
1114                             auxtrace_error_name(i));
1115         }
1116 }
1117
1118 int perf_event__process_auxtrace_error(struct perf_tool *tool __maybe_unused,
1119                                        union perf_event *event,
1120                                        struct perf_session *session)
1121 {
1122         if (auxtrace__dont_decode(session))
1123                 return 0;
1124
1125         perf_event__fprintf_auxtrace_error(event, stdout);
1126         return 0;
1127 }
1128
1129 static int __auxtrace_mmap__read(struct auxtrace_mmap *mm,
1130                                  struct auxtrace_record *itr,
1131                                  struct perf_tool *tool, process_auxtrace_t fn,
1132                                  bool snapshot, size_t snapshot_size)
1133 {
1134         u64 head, old = mm->prev, offset, ref;
1135         unsigned char *data = mm->base;
1136         size_t size, head_off, old_off, len1, len2, padding;
1137         union perf_event ev;
1138         void *data1, *data2;
1139
1140         if (snapshot) {
1141                 head = auxtrace_mmap__read_snapshot_head(mm);
1142                 if (auxtrace_record__find_snapshot(itr, mm->idx, mm, data,
1143                                                    &head, &old))
1144                         return -1;
1145         } else {
1146                 head = auxtrace_mmap__read_head(mm);
1147         }
1148
1149         if (old == head)
1150                 return 0;
1151
1152         pr_debug3("auxtrace idx %d old %#"PRIx64" head %#"PRIx64" diff %#"PRIx64"\n",
1153                   mm->idx, old, head, head - old);
1154
1155         if (mm->mask) {
1156                 head_off = head & mm->mask;
1157                 old_off = old & mm->mask;
1158         } else {
1159                 head_off = head % mm->len;
1160                 old_off = old % mm->len;
1161         }
1162
1163         if (head_off > old_off)
1164                 size = head_off - old_off;
1165         else
1166                 size = mm->len - (old_off - head_off);
1167
1168         if (snapshot && size > snapshot_size)
1169                 size = snapshot_size;
1170
1171         ref = auxtrace_record__reference(itr);
1172
1173         if (head > old || size <= head || mm->mask) {
1174                 offset = head - size;
1175         } else {
1176                 /*
1177                  * When the buffer size is not a power of 2, 'head' wraps at the
1178                  * highest multiple of the buffer size, so we have to subtract
1179                  * the remainder here.
1180                  */
1181                 u64 rem = (0ULL - mm->len) % mm->len;
1182
1183                 offset = head - size - rem;
1184         }
1185
1186         if (size > head_off) {
1187                 len1 = size - head_off;
1188                 data1 = &data[mm->len - len1];
1189                 len2 = head_off;
1190                 data2 = &data[0];
1191         } else {
1192                 len1 = size;
1193                 data1 = &data[head_off - len1];
1194                 len2 = 0;
1195                 data2 = NULL;
1196         }
1197
1198         if (itr->alignment) {
1199                 unsigned int unwanted = len1 % itr->alignment;
1200
1201                 len1 -= unwanted;
1202                 size -= unwanted;
1203         }
1204
1205         /* padding must be written by fn() e.g. record__process_auxtrace() */
1206         padding = size & 7;
1207         if (padding)
1208                 padding = 8 - padding;
1209
1210         memset(&ev, 0, sizeof(ev));
1211         ev.auxtrace.header.type = PERF_RECORD_AUXTRACE;
1212         ev.auxtrace.header.size = sizeof(ev.auxtrace);
1213         ev.auxtrace.size = size + padding;
1214         ev.auxtrace.offset = offset;
1215         ev.auxtrace.reference = ref;
1216         ev.auxtrace.idx = mm->idx;
1217         ev.auxtrace.tid = mm->tid;
1218         ev.auxtrace.cpu = mm->cpu;
1219
1220         if (fn(tool, &ev, data1, len1, data2, len2))
1221                 return -1;
1222
1223         mm->prev = head;
1224
1225         if (!snapshot) {
1226                 auxtrace_mmap__write_tail(mm, head);
1227                 if (itr->read_finish) {
1228                         int err;
1229
1230                         err = itr->read_finish(itr, mm->idx);
1231                         if (err < 0)
1232                                 return err;
1233                 }
1234         }
1235
1236         return 1;
1237 }
1238
1239 int auxtrace_mmap__read(struct auxtrace_mmap *mm, struct auxtrace_record *itr,
1240                         struct perf_tool *tool, process_auxtrace_t fn)
1241 {
1242         return __auxtrace_mmap__read(mm, itr, tool, fn, false, 0);
1243 }
1244
1245 int auxtrace_mmap__read_snapshot(struct auxtrace_mmap *mm,
1246                                  struct auxtrace_record *itr,
1247                                  struct perf_tool *tool, process_auxtrace_t fn,
1248                                  size_t snapshot_size)
1249 {
1250         return __auxtrace_mmap__read(mm, itr, tool, fn, true, snapshot_size);
1251 }
1252
1253 /**
1254  * struct auxtrace_cache - hash table to implement a cache
1255  * @hashtable: the hashtable
1256  * @sz: hashtable size (number of hlists)
1257  * @entry_size: size of an entry
1258  * @limit: limit the number of entries to this maximum, when reached the cache
1259  *         is dropped and caching begins again with an empty cache
1260  * @cnt: current number of entries
1261  * @bits: hashtable size (@sz = 2^@bits)
1262  */
1263 struct auxtrace_cache {
1264         struct hlist_head *hashtable;
1265         size_t sz;
1266         size_t entry_size;
1267         size_t limit;
1268         size_t cnt;
1269         unsigned int bits;
1270 };
1271
1272 struct auxtrace_cache *auxtrace_cache__new(unsigned int bits, size_t entry_size,
1273                                            unsigned int limit_percent)
1274 {
1275         struct auxtrace_cache *c;
1276         struct hlist_head *ht;
1277         size_t sz, i;
1278
1279         c = zalloc(sizeof(struct auxtrace_cache));
1280         if (!c)
1281                 return NULL;
1282
1283         sz = 1UL << bits;
1284
1285         ht = calloc(sz, sizeof(struct hlist_head));
1286         if (!ht)
1287                 goto out_free;
1288
1289         for (i = 0; i < sz; i++)
1290                 INIT_HLIST_HEAD(&ht[i]);
1291
1292         c->hashtable = ht;
1293         c->sz = sz;
1294         c->entry_size = entry_size;
1295         c->limit = (c->sz * limit_percent) / 100;
1296         c->bits = bits;
1297
1298         return c;
1299
1300 out_free:
1301         free(c);
1302         return NULL;
1303 }
1304
1305 static void auxtrace_cache__drop(struct auxtrace_cache *c)
1306 {
1307         struct auxtrace_cache_entry *entry;
1308         struct hlist_node *tmp;
1309         size_t i;
1310
1311         if (!c)
1312                 return;
1313
1314         for (i = 0; i < c->sz; i++) {
1315                 hlist_for_each_entry_safe(entry, tmp, &c->hashtable[i], hash) {
1316                         hlist_del(&entry->hash);
1317                         auxtrace_cache__free_entry(c, entry);
1318                 }
1319         }
1320
1321         c->cnt = 0;
1322 }
1323
1324 void auxtrace_cache__free(struct auxtrace_cache *c)
1325 {
1326         if (!c)
1327                 return;
1328
1329         auxtrace_cache__drop(c);
1330         free(c->hashtable);
1331         free(c);
1332 }
1333
1334 void *auxtrace_cache__alloc_entry(struct auxtrace_cache *c)
1335 {
1336         return malloc(c->entry_size);
1337 }
1338
1339 void auxtrace_cache__free_entry(struct auxtrace_cache *c __maybe_unused,
1340                                 void *entry)
1341 {
1342         free(entry);
1343 }
1344
1345 int auxtrace_cache__add(struct auxtrace_cache *c, u32 key,
1346                         struct auxtrace_cache_entry *entry)
1347 {
1348         if (c->limit && ++c->cnt > c->limit)
1349                 auxtrace_cache__drop(c);
1350
1351         entry->key = key;
1352         hlist_add_head(&entry->hash, &c->hashtable[hash_32(key, c->bits)]);
1353
1354         return 0;
1355 }
1356
1357 void *auxtrace_cache__lookup(struct auxtrace_cache *c, u32 key)
1358 {
1359         struct auxtrace_cache_entry *entry;
1360         struct hlist_head *hlist;
1361
1362         if (!c)
1363                 return NULL;
1364
1365         hlist = &c->hashtable[hash_32(key, c->bits)];
1366         hlist_for_each_entry(entry, hlist, hash) {
1367                 if (entry->key == key)
1368                         return entry;
1369         }
1370
1371         return NULL;
1372 }