1 /* 2 * intel-bts.c: Intel Processor 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 <endian.h> 17 #include <byteswap.h> 18 #include <linux/kernel.h> 19 #include <linux/types.h> 20 #include <linux/bitops.h> 21 #include <linux/log2.h> 22 23 #include "cpumap.h" 24 #include "color.h" 25 #include "evsel.h" 26 #include "evlist.h" 27 #include "machine.h" 28 #include "session.h" 29 #include "util.h" 30 #include "thread.h" 31 #include "thread-stack.h" 32 #include "debug.h" 33 #include "tsc.h" 34 #include "auxtrace.h" 35 #include "intel-pt-decoder/intel-pt-insn-decoder.h" 36 #include "intel-bts.h" 37 38 #define MAX_TIMESTAMP (~0ULL) 39 40 #define INTEL_BTS_ERR_NOINSN 5 41 #define INTEL_BTS_ERR_LOST 9 42 43 #if __BYTE_ORDER == __BIG_ENDIAN 44 #define le64_to_cpu bswap_64 45 #else 46 #define le64_to_cpu 47 #endif 48 49 struct intel_bts { 50 struct auxtrace auxtrace; 51 struct auxtrace_queues queues; 52 struct auxtrace_heap heap; 53 u32 auxtrace_type; 54 struct perf_session *session; 55 struct machine *machine; 56 bool sampling_mode; 57 bool snapshot_mode; 58 bool data_queued; 59 u32 pmu_type; 60 struct perf_tsc_conversion tc; 61 bool cap_user_time_zero; 62 struct itrace_synth_opts synth_opts; 63 bool sample_branches; 64 u32 branches_filter; 65 u64 branches_sample_type; 66 u64 branches_id; 67 size_t branches_event_size; 68 bool synth_needs_swap; 69 }; 70 71 struct intel_bts_queue { 72 struct intel_bts *bts; 73 unsigned int queue_nr; 74 struct auxtrace_buffer *buffer; 75 bool on_heap; 76 bool done; 77 pid_t pid; 78 pid_t tid; 79 int cpu; 80 u64 time; 81 struct intel_pt_insn intel_pt_insn; 82 u32 sample_flags; 83 }; 84 85 struct branch { 86 u64 from; 87 u64 to; 88 u64 misc; 89 }; 90 91 static void intel_bts_dump(struct intel_bts *bts __maybe_unused, 92 unsigned char *buf, size_t len) 93 { 94 struct branch *branch; 95 size_t i, pos = 0, br_sz = sizeof(struct branch), sz; 96 const char *color = PERF_COLOR_BLUE; 97 98 color_fprintf(stdout, color, 99 ". ... Intel BTS data: size %zu bytes\n", 100 len); 101 102 while (len) { 103 if (len >= br_sz) 104 sz = br_sz; 105 else 106 sz = len; 107 printf("."); 108 color_fprintf(stdout, color, " %08x: ", pos); 109 for (i = 0; i < sz; i++) 110 color_fprintf(stdout, color, " %02x", buf[i]); 111 for (; i < br_sz; i++) 112 color_fprintf(stdout, color, " "); 113 if (len >= br_sz) { 114 branch = (struct branch *)buf; 115 color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n", 116 le64_to_cpu(branch->from), 117 le64_to_cpu(branch->to), 118 le64_to_cpu(branch->misc) & 0x10 ? 119 "pred" : "miss"); 120 } else { 121 color_fprintf(stdout, color, " Bad record!\n"); 122 } 123 pos += sz; 124 buf += sz; 125 len -= sz; 126 } 127 } 128 129 static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf, 130 size_t len) 131 { 132 printf(".\n"); 133 intel_bts_dump(bts, buf, len); 134 } 135 136 static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample) 137 { 138 union perf_event event; 139 int err; 140 141 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE, 142 INTEL_BTS_ERR_LOST, sample->cpu, sample->pid, 143 sample->tid, 0, "Lost trace data"); 144 145 err = perf_session__deliver_synth_event(bts->session, &event, NULL); 146 if (err) 147 pr_err("Intel BTS: failed to deliver error event, error %d\n", 148 err); 149 150 return err; 151 } 152 153 static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts, 154 unsigned int queue_nr) 155 { 156 struct intel_bts_queue *btsq; 157 158 btsq = zalloc(sizeof(struct intel_bts_queue)); 159 if (!btsq) 160 return NULL; 161 162 btsq->bts = bts; 163 btsq->queue_nr = queue_nr; 164 btsq->pid = -1; 165 btsq->tid = -1; 166 btsq->cpu = -1; 167 168 return btsq; 169 } 170 171 static int intel_bts_setup_queue(struct intel_bts *bts, 172 struct auxtrace_queue *queue, 173 unsigned int queue_nr) 174 { 175 struct intel_bts_queue *btsq = queue->priv; 176 177 if (list_empty(&queue->head)) 178 return 0; 179 180 if (!btsq) { 181 btsq = intel_bts_alloc_queue(bts, queue_nr); 182 if (!btsq) 183 return -ENOMEM; 184 queue->priv = btsq; 185 186 if (queue->cpu != -1) 187 btsq->cpu = queue->cpu; 188 btsq->tid = queue->tid; 189 } 190 191 if (bts->sampling_mode) 192 return 0; 193 194 if (!btsq->on_heap && !btsq->buffer) { 195 int ret; 196 197 btsq->buffer = auxtrace_buffer__next(queue, NULL); 198 if (!btsq->buffer) 199 return 0; 200 201 ret = auxtrace_heap__add(&bts->heap, queue_nr, 202 btsq->buffer->reference); 203 if (ret) 204 return ret; 205 btsq->on_heap = true; 206 } 207 208 return 0; 209 } 210 211 static int intel_bts_setup_queues(struct intel_bts *bts) 212 { 213 unsigned int i; 214 int ret; 215 216 for (i = 0; i < bts->queues.nr_queues; i++) { 217 ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i], 218 i); 219 if (ret) 220 return ret; 221 } 222 return 0; 223 } 224 225 static inline int intel_bts_update_queues(struct intel_bts *bts) 226 { 227 if (bts->queues.new_data) { 228 bts->queues.new_data = false; 229 return intel_bts_setup_queues(bts); 230 } 231 return 0; 232 } 233 234 static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a, 235 unsigned char *buf_b, size_t len_b) 236 { 237 size_t offs, len; 238 239 if (len_a > len_b) 240 offs = len_a - len_b; 241 else 242 offs = 0; 243 244 for (; offs < len_a; offs += sizeof(struct branch)) { 245 len = len_a - offs; 246 if (!memcmp(buf_a + offs, buf_b, len)) 247 return buf_b + len; 248 } 249 250 return buf_b; 251 } 252 253 static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue, 254 struct auxtrace_buffer *b) 255 { 256 struct auxtrace_buffer *a; 257 void *start; 258 259 if (b->list.prev == &queue->head) 260 return 0; 261 a = list_entry(b->list.prev, struct auxtrace_buffer, list); 262 start = intel_bts_find_overlap(a->data, a->size, b->data, b->size); 263 if (!start) 264 return -EINVAL; 265 b->use_size = b->data + b->size - start; 266 b->use_data = start; 267 return 0; 268 } 269 270 static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq, 271 struct branch *branch) 272 { 273 int ret; 274 struct intel_bts *bts = btsq->bts; 275 union perf_event event; 276 struct perf_sample sample = { .ip = 0, }; 277 278 event.sample.header.type = PERF_RECORD_SAMPLE; 279 event.sample.header.misc = PERF_RECORD_MISC_USER; 280 event.sample.header.size = sizeof(struct perf_event_header); 281 282 sample.ip = le64_to_cpu(branch->from); 283 sample.pid = btsq->pid; 284 sample.tid = btsq->tid; 285 sample.addr = le64_to_cpu(branch->to); 286 sample.id = btsq->bts->branches_id; 287 sample.stream_id = btsq->bts->branches_id; 288 sample.period = 1; 289 sample.cpu = btsq->cpu; 290 sample.flags = btsq->sample_flags; 291 sample.insn_len = btsq->intel_pt_insn.length; 292 293 if (bts->synth_opts.inject) { 294 event.sample.header.size = bts->branches_event_size; 295 ret = perf_event__synthesize_sample(&event, 296 bts->branches_sample_type, 297 0, &sample, 298 bts->synth_needs_swap); 299 if (ret) 300 return ret; 301 } 302 303 ret = perf_session__deliver_synth_event(bts->session, &event, &sample); 304 if (ret) 305 pr_err("Intel BTS: failed to deliver branch event, error %d\n", 306 ret); 307 308 return ret; 309 } 310 311 static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip) 312 { 313 struct machine *machine = btsq->bts->machine; 314 struct thread *thread; 315 struct addr_location al; 316 unsigned char buf[1024]; 317 size_t bufsz; 318 ssize_t len; 319 int x86_64; 320 uint8_t cpumode; 321 int err = -1; 322 323 bufsz = intel_pt_insn_max_size(); 324 325 if (machine__kernel_ip(machine, ip)) 326 cpumode = PERF_RECORD_MISC_KERNEL; 327 else 328 cpumode = PERF_RECORD_MISC_USER; 329 330 thread = machine__find_thread(machine, -1, btsq->tid); 331 if (!thread) 332 return -1; 333 334 thread__find_addr_map(thread, cpumode, MAP__FUNCTION, ip, &al); 335 if (!al.map || !al.map->dso) 336 goto out_put; 337 338 len = dso__data_read_addr(al.map->dso, al.map, machine, ip, buf, bufsz); 339 if (len <= 0) 340 goto out_put; 341 342 /* Load maps to ensure dso->is_64_bit has been updated */ 343 map__load(al.map, machine->symbol_filter); 344 345 x86_64 = al.map->dso->is_64_bit; 346 347 if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn)) 348 goto out_put; 349 350 err = 0; 351 out_put: 352 thread__put(thread); 353 return err; 354 } 355 356 static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid, 357 pid_t tid, u64 ip) 358 { 359 union perf_event event; 360 int err; 361 362 auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE, 363 INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip, 364 "Failed to get instruction"); 365 366 err = perf_session__deliver_synth_event(bts->session, &event, NULL); 367 if (err) 368 pr_err("Intel BTS: failed to deliver error event, error %d\n", 369 err); 370 371 return err; 372 } 373 374 static int intel_bts_get_branch_type(struct intel_bts_queue *btsq, 375 struct branch *branch) 376 { 377 int err; 378 379 if (!branch->from) { 380 if (branch->to) 381 btsq->sample_flags = PERF_IP_FLAG_BRANCH | 382 PERF_IP_FLAG_TRACE_BEGIN; 383 else 384 btsq->sample_flags = 0; 385 btsq->intel_pt_insn.length = 0; 386 } else if (!branch->to) { 387 btsq->sample_flags = PERF_IP_FLAG_BRANCH | 388 PERF_IP_FLAG_TRACE_END; 389 btsq->intel_pt_insn.length = 0; 390 } else { 391 err = intel_bts_get_next_insn(btsq, branch->from); 392 if (err) { 393 btsq->sample_flags = 0; 394 btsq->intel_pt_insn.length = 0; 395 if (!btsq->bts->synth_opts.errors) 396 return 0; 397 err = intel_bts_synth_error(btsq->bts, btsq->cpu, 398 btsq->pid, btsq->tid, 399 branch->from); 400 return err; 401 } 402 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op); 403 /* Check for an async branch into the kernel */ 404 if (!machine__kernel_ip(btsq->bts->machine, branch->from) && 405 machine__kernel_ip(btsq->bts->machine, branch->to) && 406 btsq->sample_flags != (PERF_IP_FLAG_BRANCH | 407 PERF_IP_FLAG_CALL | 408 PERF_IP_FLAG_SYSCALLRET)) 409 btsq->sample_flags = PERF_IP_FLAG_BRANCH | 410 PERF_IP_FLAG_CALL | 411 PERF_IP_FLAG_ASYNC | 412 PERF_IP_FLAG_INTERRUPT; 413 } 414 415 return 0; 416 } 417 418 static int intel_bts_process_buffer(struct intel_bts_queue *btsq, 419 struct auxtrace_buffer *buffer) 420 { 421 struct branch *branch; 422 size_t sz, bsz = sizeof(struct branch); 423 u32 filter = btsq->bts->branches_filter; 424 int err = 0; 425 426 if (buffer->use_data) { 427 sz = buffer->use_size; 428 branch = buffer->use_data; 429 } else { 430 sz = buffer->size; 431 branch = buffer->data; 432 } 433 434 if (!btsq->bts->sample_branches) 435 return 0; 436 437 for (; sz > bsz; branch += 1, sz -= bsz) { 438 if (!branch->from && !branch->to) 439 continue; 440 intel_bts_get_branch_type(btsq, branch); 441 if (filter && !(filter & btsq->sample_flags)) 442 continue; 443 err = intel_bts_synth_branch_sample(btsq, branch); 444 if (err) 445 break; 446 } 447 return err; 448 } 449 450 static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp) 451 { 452 struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer; 453 struct auxtrace_queue *queue; 454 struct thread *thread; 455 int err; 456 457 if (btsq->done) 458 return 1; 459 460 if (btsq->pid == -1) { 461 thread = machine__find_thread(btsq->bts->machine, -1, 462 btsq->tid); 463 if (thread) 464 btsq->pid = thread->pid_; 465 } else { 466 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid, 467 btsq->tid); 468 } 469 470 queue = &btsq->bts->queues.queue_array[btsq->queue_nr]; 471 472 if (!buffer) 473 buffer = auxtrace_buffer__next(queue, NULL); 474 475 if (!buffer) { 476 if (!btsq->bts->sampling_mode) 477 btsq->done = 1; 478 err = 1; 479 goto out_put; 480 } 481 482 /* Currently there is no support for split buffers */ 483 if (buffer->consecutive) { 484 err = -EINVAL; 485 goto out_put; 486 } 487 488 if (!buffer->data) { 489 int fd = perf_data_file__fd(btsq->bts->session->file); 490 491 buffer->data = auxtrace_buffer__get_data(buffer, fd); 492 if (!buffer->data) { 493 err = -ENOMEM; 494 goto out_put; 495 } 496 } 497 498 if (btsq->bts->snapshot_mode && !buffer->consecutive && 499 intel_bts_do_fix_overlap(queue, buffer)) { 500 err = -ENOMEM; 501 goto out_put; 502 } 503 504 if (!btsq->bts->synth_opts.callchain && thread && 505 (!old_buffer || btsq->bts->sampling_mode || 506 (btsq->bts->snapshot_mode && !buffer->consecutive))) 507 thread_stack__set_trace_nr(thread, buffer->buffer_nr + 1); 508 509 err = intel_bts_process_buffer(btsq, buffer); 510 511 auxtrace_buffer__drop_data(buffer); 512 513 btsq->buffer = auxtrace_buffer__next(queue, buffer); 514 if (btsq->buffer) { 515 if (timestamp) 516 *timestamp = btsq->buffer->reference; 517 } else { 518 if (!btsq->bts->sampling_mode) 519 btsq->done = 1; 520 } 521 out_put: 522 thread__put(thread); 523 return err; 524 } 525 526 static int intel_bts_flush_queue(struct intel_bts_queue *btsq) 527 { 528 u64 ts = 0; 529 int ret; 530 531 while (1) { 532 ret = intel_bts_process_queue(btsq, &ts); 533 if (ret < 0) 534 return ret; 535 if (ret) 536 break; 537 } 538 return 0; 539 } 540 541 static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid) 542 { 543 struct auxtrace_queues *queues = &bts->queues; 544 unsigned int i; 545 546 for (i = 0; i < queues->nr_queues; i++) { 547 struct auxtrace_queue *queue = &bts->queues.queue_array[i]; 548 struct intel_bts_queue *btsq = queue->priv; 549 550 if (btsq && btsq->tid == tid) 551 return intel_bts_flush_queue(btsq); 552 } 553 return 0; 554 } 555 556 static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp) 557 { 558 while (1) { 559 unsigned int queue_nr; 560 struct auxtrace_queue *queue; 561 struct intel_bts_queue *btsq; 562 u64 ts = 0; 563 int ret; 564 565 if (!bts->heap.heap_cnt) 566 return 0; 567 568 if (bts->heap.heap_array[0].ordinal > timestamp) 569 return 0; 570 571 queue_nr = bts->heap.heap_array[0].queue_nr; 572 queue = &bts->queues.queue_array[queue_nr]; 573 btsq = queue->priv; 574 575 auxtrace_heap__pop(&bts->heap); 576 577 ret = intel_bts_process_queue(btsq, &ts); 578 if (ret < 0) { 579 auxtrace_heap__add(&bts->heap, queue_nr, ts); 580 return ret; 581 } 582 583 if (!ret) { 584 ret = auxtrace_heap__add(&bts->heap, queue_nr, ts); 585 if (ret < 0) 586 return ret; 587 } else { 588 btsq->on_heap = false; 589 } 590 } 591 592 return 0; 593 } 594 595 static int intel_bts_process_event(struct perf_session *session, 596 union perf_event *event, 597 struct perf_sample *sample, 598 struct perf_tool *tool) 599 { 600 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts, 601 auxtrace); 602 u64 timestamp; 603 int err; 604 605 if (dump_trace) 606 return 0; 607 608 if (!tool->ordered_events) { 609 pr_err("Intel BTS requires ordered events\n"); 610 return -EINVAL; 611 } 612 613 if (sample->time && sample->time != (u64)-1) 614 timestamp = perf_time_to_tsc(sample->time, &bts->tc); 615 else 616 timestamp = 0; 617 618 err = intel_bts_update_queues(bts); 619 if (err) 620 return err; 621 622 err = intel_bts_process_queues(bts, timestamp); 623 if (err) 624 return err; 625 if (event->header.type == PERF_RECORD_EXIT) { 626 err = intel_bts_process_tid_exit(bts, event->fork.tid); 627 if (err) 628 return err; 629 } 630 631 if (event->header.type == PERF_RECORD_AUX && 632 (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) && 633 bts->synth_opts.errors) 634 err = intel_bts_lost(bts, sample); 635 636 return err; 637 } 638 639 static int intel_bts_process_auxtrace_event(struct perf_session *session, 640 union perf_event *event, 641 struct perf_tool *tool __maybe_unused) 642 { 643 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts, 644 auxtrace); 645 646 if (bts->sampling_mode) 647 return 0; 648 649 if (!bts->data_queued) { 650 struct auxtrace_buffer *buffer; 651 off_t data_offset; 652 int fd = perf_data_file__fd(session->file); 653 int err; 654 655 if (perf_data_file__is_pipe(session->file)) { 656 data_offset = 0; 657 } else { 658 data_offset = lseek(fd, 0, SEEK_CUR); 659 if (data_offset == -1) 660 return -errno; 661 } 662 663 err = auxtrace_queues__add_event(&bts->queues, session, event, 664 data_offset, &buffer); 665 if (err) 666 return err; 667 668 /* Dump here now we have copied a piped trace out of the pipe */ 669 if (dump_trace) { 670 if (auxtrace_buffer__get_data(buffer, fd)) { 671 intel_bts_dump_event(bts, buffer->data, 672 buffer->size); 673 auxtrace_buffer__put_data(buffer); 674 } 675 } 676 } 677 678 return 0; 679 } 680 681 static int intel_bts_flush(struct perf_session *session __maybe_unused, 682 struct perf_tool *tool __maybe_unused) 683 { 684 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts, 685 auxtrace); 686 int ret; 687 688 if (dump_trace || bts->sampling_mode) 689 return 0; 690 691 if (!tool->ordered_events) 692 return -EINVAL; 693 694 ret = intel_bts_update_queues(bts); 695 if (ret < 0) 696 return ret; 697 698 return intel_bts_process_queues(bts, MAX_TIMESTAMP); 699 } 700 701 static void intel_bts_free_queue(void *priv) 702 { 703 struct intel_bts_queue *btsq = priv; 704 705 if (!btsq) 706 return; 707 free(btsq); 708 } 709 710 static void intel_bts_free_events(struct perf_session *session) 711 { 712 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts, 713 auxtrace); 714 struct auxtrace_queues *queues = &bts->queues; 715 unsigned int i; 716 717 for (i = 0; i < queues->nr_queues; i++) { 718 intel_bts_free_queue(queues->queue_array[i].priv); 719 queues->queue_array[i].priv = NULL; 720 } 721 auxtrace_queues__free(queues); 722 } 723 724 static void intel_bts_free(struct perf_session *session) 725 { 726 struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts, 727 auxtrace); 728 729 auxtrace_heap__free(&bts->heap); 730 intel_bts_free_events(session); 731 session->auxtrace = NULL; 732 free(bts); 733 } 734 735 struct intel_bts_synth { 736 struct perf_tool dummy_tool; 737 struct perf_session *session; 738 }; 739 740 static int intel_bts_event_synth(struct perf_tool *tool, 741 union perf_event *event, 742 struct perf_sample *sample __maybe_unused, 743 struct machine *machine __maybe_unused) 744 { 745 struct intel_bts_synth *intel_bts_synth = 746 container_of(tool, struct intel_bts_synth, dummy_tool); 747 748 return perf_session__deliver_synth_event(intel_bts_synth->session, 749 event, NULL); 750 } 751 752 static int intel_bts_synth_event(struct perf_session *session, 753 struct perf_event_attr *attr, u64 id) 754 { 755 struct intel_bts_synth intel_bts_synth; 756 757 memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth)); 758 intel_bts_synth.session = session; 759 760 return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1, 761 &id, intel_bts_event_synth); 762 } 763 764 static int intel_bts_synth_events(struct intel_bts *bts, 765 struct perf_session *session) 766 { 767 struct perf_evlist *evlist = session->evlist; 768 struct perf_evsel *evsel; 769 struct perf_event_attr attr; 770 bool found = false; 771 u64 id; 772 int err; 773 774 evlist__for_each(evlist, evsel) { 775 if (evsel->attr.type == bts->pmu_type && evsel->ids) { 776 found = true; 777 break; 778 } 779 } 780 781 if (!found) { 782 pr_debug("There are no selected events with Intel BTS data\n"); 783 return 0; 784 } 785 786 memset(&attr, 0, sizeof(struct perf_event_attr)); 787 attr.size = sizeof(struct perf_event_attr); 788 attr.type = PERF_TYPE_HARDWARE; 789 attr.sample_type = evsel->attr.sample_type & PERF_SAMPLE_MASK; 790 attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID | 791 PERF_SAMPLE_PERIOD; 792 attr.sample_type &= ~(u64)PERF_SAMPLE_TIME; 793 attr.sample_type &= ~(u64)PERF_SAMPLE_CPU; 794 attr.exclude_user = evsel->attr.exclude_user; 795 attr.exclude_kernel = evsel->attr.exclude_kernel; 796 attr.exclude_hv = evsel->attr.exclude_hv; 797 attr.exclude_host = evsel->attr.exclude_host; 798 attr.exclude_guest = evsel->attr.exclude_guest; 799 attr.sample_id_all = evsel->attr.sample_id_all; 800 attr.read_format = evsel->attr.read_format; 801 802 id = evsel->id[0] + 1000000000; 803 if (!id) 804 id = 1; 805 806 if (bts->synth_opts.branches) { 807 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS; 808 attr.sample_period = 1; 809 attr.sample_type |= PERF_SAMPLE_ADDR; 810 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n", 811 id, (u64)attr.sample_type); 812 err = intel_bts_synth_event(session, &attr, id); 813 if (err) { 814 pr_err("%s: failed to synthesize 'branches' event type\n", 815 __func__); 816 return err; 817 } 818 bts->sample_branches = true; 819 bts->branches_sample_type = attr.sample_type; 820 bts->branches_id = id; 821 /* 822 * We only use sample types from PERF_SAMPLE_MASK so we can use 823 * __perf_evsel__sample_size() here. 824 */ 825 bts->branches_event_size = sizeof(struct sample_event) + 826 __perf_evsel__sample_size(attr.sample_type); 827 } 828 829 bts->synth_needs_swap = evsel->needs_swap; 830 831 return 0; 832 } 833 834 static const char * const intel_bts_info_fmts[] = { 835 [INTEL_BTS_PMU_TYPE] = " PMU Type %"PRId64"\n", 836 [INTEL_BTS_TIME_SHIFT] = " Time Shift %"PRIu64"\n", 837 [INTEL_BTS_TIME_MULT] = " Time Muliplier %"PRIu64"\n", 838 [INTEL_BTS_TIME_ZERO] = " Time Zero %"PRIu64"\n", 839 [INTEL_BTS_CAP_USER_TIME_ZERO] = " Cap Time Zero %"PRId64"\n", 840 [INTEL_BTS_SNAPSHOT_MODE] = " Snapshot mode %"PRId64"\n", 841 }; 842 843 static void intel_bts_print_info(u64 *arr, int start, int finish) 844 { 845 int i; 846 847 if (!dump_trace) 848 return; 849 850 for (i = start; i <= finish; i++) 851 fprintf(stdout, intel_bts_info_fmts[i], arr[i]); 852 } 853 854 u64 intel_bts_auxtrace_info_priv[INTEL_BTS_AUXTRACE_PRIV_SIZE]; 855 856 int intel_bts_process_auxtrace_info(union perf_event *event, 857 struct perf_session *session) 858 { 859 struct auxtrace_info_event *auxtrace_info = &event->auxtrace_info; 860 size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE; 861 struct intel_bts *bts; 862 int err; 863 864 if (auxtrace_info->header.size < sizeof(struct auxtrace_info_event) + 865 min_sz) 866 return -EINVAL; 867 868 bts = zalloc(sizeof(struct intel_bts)); 869 if (!bts) 870 return -ENOMEM; 871 872 err = auxtrace_queues__init(&bts->queues); 873 if (err) 874 goto err_free; 875 876 bts->session = session; 877 bts->machine = &session->machines.host; /* No kvm support */ 878 bts->auxtrace_type = auxtrace_info->type; 879 bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE]; 880 bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT]; 881 bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT]; 882 bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO]; 883 bts->cap_user_time_zero = 884 auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO]; 885 bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE]; 886 887 bts->sampling_mode = false; 888 889 bts->auxtrace.process_event = intel_bts_process_event; 890 bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event; 891 bts->auxtrace.flush_events = intel_bts_flush; 892 bts->auxtrace.free_events = intel_bts_free_events; 893 bts->auxtrace.free = intel_bts_free; 894 session->auxtrace = &bts->auxtrace; 895 896 intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE, 897 INTEL_BTS_SNAPSHOT_MODE); 898 899 if (dump_trace) 900 return 0; 901 902 if (session->itrace_synth_opts && session->itrace_synth_opts->set) 903 bts->synth_opts = *session->itrace_synth_opts; 904 else 905 itrace_synth_opts__set_default(&bts->synth_opts); 906 907 if (bts->synth_opts.calls) 908 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC | 909 PERF_IP_FLAG_TRACE_END; 910 if (bts->synth_opts.returns) 911 bts->branches_filter |= PERF_IP_FLAG_RETURN | 912 PERF_IP_FLAG_TRACE_BEGIN; 913 914 err = intel_bts_synth_events(bts, session); 915 if (err) 916 goto err_free_queues; 917 918 err = auxtrace_queues__process_index(&bts->queues, session); 919 if (err) 920 goto err_free_queues; 921 922 if (bts->queues.populated) 923 bts->data_queued = true; 924 925 return 0; 926 927 err_free_queues: 928 auxtrace_queues__free(&bts->queues); 929 session->auxtrace = NULL; 930 err_free: 931 free(bts); 932 return err; 933 } 934