tools/perf/util/intel-bts.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * intel-bts.c: Intel Processor Trace support
   4  * Copyright (c) 2013-2015, Intel Corporation.
   5  */
   6
   7 #include <endian.h>
   8 #include <errno.h>
   9 #include <byteswap.h>
  10 #include <inttypes.h>
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/bitops.h>
  14 #include <linux/log2.h>
  15 #include <linux/zalloc.h>
  16
  17 #include "color.h"
  18 #include "evsel.h"
  19 #include "evlist.h"
  20 #include "machine.h"
  21 #include "symbol.h"
  22 #include "session.h"
  23 #include "tool.h"
  24 #include "thread.h"
  25 #include "thread-stack.h"
  26 #include "debug.h"
  27 #include "tsc.h"
  28 #include "auxtrace.h"
  29 #include "intel-pt-decoder/intel-pt-insn-decoder.h"
  30 #include "intel-bts.h"
  31 #include "util/synthetic-events.h"
  32
  33 #define MAX_TIMESTAMP (~0ULL)
  34
  35 #define INTEL_BTS_ERR_NOINSN  5
  36 #define INTEL_BTS_ERR_LOST    9
  37
  38 #if __BYTE_ORDER == __BIG_ENDIAN
  39 #define le64_to_cpu bswap_64
  40 #else
  41 #define le64_to_cpu
  42 #endif
  43
  44 struct intel_bts {
  45         struct auxtrace                 auxtrace;
  46         struct auxtrace_queues          queues;
  47         struct auxtrace_heap            heap;
  48         u32                             auxtrace_type;
  49         struct perf_session             *session;
  50         struct machine                  *machine;
  51         bool                            sampling_mode;
  52         bool                            snapshot_mode;
  53         bool                            data_queued;
  54         u32                             pmu_type;
  55         struct perf_tsc_conversion      tc;
  56         bool                            cap_user_time_zero;
  57         struct itrace_synth_opts        synth_opts;
  58         bool                            sample_branches;
  59         u32                             branches_filter;
  60         u64                             branches_sample_type;
  61         u64                             branches_id;
  62         size_t                          branches_event_size;
  63         unsigned long                   num_events;
  64 };
  65
  66 struct intel_bts_queue {
  67         struct intel_bts        *bts;
  68         unsigned int            queue_nr;
  69         struct auxtrace_buffer  *buffer;
  70         bool                    on_heap;
  71         bool                    done;
  72         pid_t                   pid;
  73         pid_t                   tid;
  74         int                     cpu;
  75         u64                     time;
  76         struct intel_pt_insn    intel_pt_insn;
  77         u32                     sample_flags;
  78 };
  79
  80 struct branch {
  81         u64 from;
  82         u64 to;
  83         u64 misc;
  84 };
  85
  86 static void intel_bts_dump(struct intel_bts *bts __maybe_unused,
  87                            unsigned char *buf, size_t len)
  88 {
  89         struct branch *branch;
  90         size_t i, pos = 0, br_sz = sizeof(struct branch), sz;
  91         const char *color = PERF_COLOR_BLUE;
  92
  93         color_fprintf(stdout, color,
  94                       ". ... Intel BTS data: size %zu bytes\n",
  95                       len);
  96
  97         while (len) {
  98                 if (len >= br_sz)
  99                         sz = br_sz;
 100                 else
 101                         sz = len;
 102                 printf(".");
 103                 color_fprintf(stdout, color, "  %08x: ", pos);
 104                 for (i = 0; i < sz; i++)
 105                         color_fprintf(stdout, color, " %02x", buf[i]);
 106                 for (; i < br_sz; i++)
 107                         color_fprintf(stdout, color, "   ");
 108                 if (len >= br_sz) {
 109                         branch = (struct branch *)buf;
 110                         color_fprintf(stdout, color, " %"PRIx64" -> %"PRIx64" %s\n",
 111                                       le64_to_cpu(branch->from),
 112                                       le64_to_cpu(branch->to),
 113                                       le64_to_cpu(branch->misc) & 0x10 ?
 114                                                         "pred" : "miss");
 115                 } else {
 116                         color_fprintf(stdout, color, " Bad record!\n");
 117                 }
 118                 pos += sz;
 119                 buf += sz;
 120                 len -= sz;
 121         }
 122 }
 123
 124 static void intel_bts_dump_event(struct intel_bts *bts, unsigned char *buf,
 125                                  size_t len)
 126 {
 127         printf(".\n");
 128         intel_bts_dump(bts, buf, len);
 129 }
 130
 131 static int intel_bts_lost(struct intel_bts *bts, struct perf_sample *sample)
 132 {
 133         union perf_event event;
 134         int err;
 135
 136         auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 137                              INTEL_BTS_ERR_LOST, sample->cpu, sample->pid,
 138                              sample->tid, 0, "Lost trace data", sample->time);
 139
 140         err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 141         if (err)
 142                 pr_err("Intel BTS: failed to deliver error event, error %d\n",
 143                        err);
 144
 145         return err;
 146 }
 147
 148 static struct intel_bts_queue *intel_bts_alloc_queue(struct intel_bts *bts,
 149                                                      unsigned int queue_nr)
 150 {
 151         struct intel_bts_queue *btsq;
 152
 153         btsq = zalloc(sizeof(struct intel_bts_queue));
 154         if (!btsq)
 155                 return NULL;
 156
 157         btsq->bts = bts;
 158         btsq->queue_nr = queue_nr;
 159         btsq->pid = -1;
 160         btsq->tid = -1;
 161         btsq->cpu = -1;
 162
 163         return btsq;
 164 }
 165
 166 static int intel_bts_setup_queue(struct intel_bts *bts,
 167                                  struct auxtrace_queue *queue,
 168                                  unsigned int queue_nr)
 169 {
 170         struct intel_bts_queue *btsq = queue->priv;
 171
 172         if (list_empty(&queue->head))
 173                 return 0;
 174
 175         if (!btsq) {
 176                 btsq = intel_bts_alloc_queue(bts, queue_nr);
 177                 if (!btsq)
 178                         return -ENOMEM;
 179                 queue->priv = btsq;
 180
 181                 if (queue->cpu != -1)
 182                         btsq->cpu = queue->cpu;
 183                 btsq->tid = queue->tid;
 184         }
 185
 186         if (bts->sampling_mode)
 187                 return 0;
 188
 189         if (!btsq->on_heap && !btsq->buffer) {
 190                 int ret;
 191
 192                 btsq->buffer = auxtrace_buffer__next(queue, NULL);
 193                 if (!btsq->buffer)
 194                         return 0;
 195
 196                 ret = auxtrace_heap__add(&bts->heap, queue_nr,
 197                                          btsq->buffer->reference);
 198                 if (ret)
 199                         return ret;
 200                 btsq->on_heap = true;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int intel_bts_setup_queues(struct intel_bts *bts)
 207 {
 208         unsigned int i;
 209         int ret;
 210
 211         for (i = 0; i < bts->queues.nr_queues; i++) {
 212                 ret = intel_bts_setup_queue(bts, &bts->queues.queue_array[i],
 213                                             i);
 214                 if (ret)
 215                         return ret;
 216         }
 217         return 0;
 218 }
 219
 220 static inline int intel_bts_update_queues(struct intel_bts *bts)
 221 {
 222         if (bts->queues.new_data) {
 223                 bts->queues.new_data = false;
 224                 return intel_bts_setup_queues(bts);
 225         }
 226         return 0;
 227 }
 228
 229 static unsigned char *intel_bts_find_overlap(unsigned char *buf_a, size_t len_a,
 230                                              unsigned char *buf_b, size_t len_b)
 231 {
 232         size_t offs, len;
 233
 234         if (len_a > len_b)
 235                 offs = len_a - len_b;
 236         else
 237                 offs = 0;
 238
 239         for (; offs < len_a; offs += sizeof(struct branch)) {
 240                 len = len_a - offs;
 241                 if (!memcmp(buf_a + offs, buf_b, len))
 242                         return buf_b + len;
 243         }
 244
 245         return buf_b;
 246 }
 247
 248 static int intel_bts_do_fix_overlap(struct auxtrace_queue *queue,
 249                                     struct auxtrace_buffer *b)
 250 {
 251         struct auxtrace_buffer *a;
 252         void *start;
 253
 254         if (b->list.prev == &queue->head)
 255                 return 0;
 256         a = list_entry(b->list.prev, struct auxtrace_buffer, list);
 257         start = intel_bts_find_overlap(a->data, a->size, b->data, b->size);
 258         if (!start)
 259                 return -EINVAL;
 260         b->use_size = b->data + b->size - start;
 261         b->use_data = start;
 262         return 0;
 263 }
 264
 265 static inline u8 intel_bts_cpumode(struct intel_bts *bts, uint64_t ip)
 266 {
 267         return machine__kernel_ip(bts->machine, ip) ?
 268                PERF_RECORD_MISC_KERNEL :
 269                PERF_RECORD_MISC_USER;
 270 }
 271
 272 static int intel_bts_synth_branch_sample(struct intel_bts_queue *btsq,
 273                                          struct branch *branch)
 274 {
 275         int ret;
 276         struct intel_bts *bts = btsq->bts;
 277         union perf_event event;
 278         struct perf_sample sample = { .ip = 0, };
 279
 280         if (bts->synth_opts.initial_skip &&
 281             bts->num_events++ <= bts->synth_opts.initial_skip)
 282                 return 0;
 283
 284         sample.ip = le64_to_cpu(branch->from);
 285         sample.cpumode = intel_bts_cpumode(bts, sample.ip);
 286         sample.pid = btsq->pid;
 287         sample.tid = btsq->tid;
 288         sample.addr = le64_to_cpu(branch->to);
 289         sample.id = btsq->bts->branches_id;
 290         sample.stream_id = btsq->bts->branches_id;
 291         sample.period = 1;
 292         sample.cpu = btsq->cpu;
 293         sample.flags = btsq->sample_flags;
 294         sample.insn_len = btsq->intel_pt_insn.length;
 295         memcpy(sample.insn, btsq->intel_pt_insn.buf, INTEL_PT_INSN_BUF_SZ);
 296
 297         event.sample.header.type = PERF_RECORD_SAMPLE;
 298         event.sample.header.misc = sample.cpumode;
 299         event.sample.header.size = sizeof(struct perf_event_header);
 300
 301         if (bts->synth_opts.inject) {
 302                 event.sample.header.size = bts->branches_event_size;
 303                 ret = perf_event__synthesize_sample(&event,
 304                                                     bts->branches_sample_type,
 305                                                     0, &sample);
 306                 if (ret)
 307                         return ret;
 308         }
 309
 310         ret = perf_session__deliver_synth_event(bts->session, &event, &sample);
 311         if (ret)
 312                 pr_err("Intel BTS: failed to deliver branch event, error %d\n",
 313                        ret);
 314
 315         return ret;
 316 }
 317
 318 static int intel_bts_get_next_insn(struct intel_bts_queue *btsq, u64 ip)
 319 {
 320         struct machine *machine = btsq->bts->machine;
 321         struct thread *thread;
 322         unsigned char buf[INTEL_PT_INSN_BUF_SZ];
 323         ssize_t len;
 324         bool x86_64;
 325         int err = -1;
 326
 327         thread = machine__find_thread(machine, -1, btsq->tid);
 328         if (!thread)
 329                 return -1;
 330
 331         len = thread__memcpy(thread, machine, buf, ip, INTEL_PT_INSN_BUF_SZ, &x86_64);
 332         if (len <= 0)
 333                 goto out_put;
 334
 335         if (intel_pt_get_insn(buf, len, x86_64, &btsq->intel_pt_insn))
 336                 goto out_put;
 337
 338         err = 0;
 339 out_put:
 340         thread__put(thread);
 341         return err;
 342 }
 343
 344 static int intel_bts_synth_error(struct intel_bts *bts, int cpu, pid_t pid,
 345                                  pid_t tid, u64 ip)
 346 {
 347         union perf_event event;
 348         int err;
 349
 350         auxtrace_synth_error(&event.auxtrace_error, PERF_AUXTRACE_ERROR_ITRACE,
 351                              INTEL_BTS_ERR_NOINSN, cpu, pid, tid, ip,
 352                              "Failed to get instruction", 0);
 353
 354         err = perf_session__deliver_synth_event(bts->session, &event, NULL);
 355         if (err)
 356                 pr_err("Intel BTS: failed to deliver error event, error %d\n",
 357                        err);
 358
 359         return err;
 360 }
 361
 362 static int intel_bts_get_branch_type(struct intel_bts_queue *btsq,
 363                                      struct branch *branch)
 364 {
 365         int err;
 366
 367         if (!branch->from) {
 368                 if (branch->to)
 369                         btsq->sample_flags = PERF_IP_FLAG_BRANCH |
 370                                              PERF_IP_FLAG_TRACE_BEGIN;
 371                 else
 372                         btsq->sample_flags = 0;
 373                 btsq->intel_pt_insn.length = 0;
 374         } else if (!branch->to) {
 375                 btsq->sample_flags = PERF_IP_FLAG_BRANCH |
 376                                      PERF_IP_FLAG_TRACE_END;
 377                 btsq->intel_pt_insn.length = 0;
 378         } else {
 379                 err = intel_bts_get_next_insn(btsq, branch->from);
 380                 if (err) {
 381                         btsq->sample_flags = 0;
 382                         btsq->intel_pt_insn.length = 0;
 383                         if (!btsq->bts->synth_opts.errors)
 384                                 return 0;
 385                         err = intel_bts_synth_error(btsq->bts, btsq->cpu,
 386                                                     btsq->pid, btsq->tid,
 387                                                     branch->from);
 388                         return err;
 389                 }
 390                 btsq->sample_flags = intel_pt_insn_type(btsq->intel_pt_insn.op);
 391                 /* Check for an async branch into the kernel */
 392                 if (!machine__kernel_ip(btsq->bts->machine, branch->from) &&
 393                     machine__kernel_ip(btsq->bts->machine, branch->to) &&
 394                     btsq->sample_flags != (PERF_IP_FLAG_BRANCH |
 395                                            PERF_IP_FLAG_CALL |
 396                                            PERF_IP_FLAG_SYSCALLRET))
 397                         btsq->sample_flags = PERF_IP_FLAG_BRANCH |
 398                                              PERF_IP_FLAG_CALL |
 399                                              PERF_IP_FLAG_ASYNC |
 400                                              PERF_IP_FLAG_INTERRUPT;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int intel_bts_process_buffer(struct intel_bts_queue *btsq,
 407                                     struct auxtrace_buffer *buffer,
 408                                     struct thread *thread)
 409 {
 410         struct branch *branch;
 411         size_t sz, bsz = sizeof(struct branch);
 412         u32 filter = btsq->bts->branches_filter;
 413         int err = 0;
 414
 415         if (buffer->use_data) {
 416                 sz = buffer->use_size;
 417                 branch = buffer->use_data;
 418         } else {
 419                 sz = buffer->size;
 420                 branch = buffer->data;
 421         }
 422
 423         if (!btsq->bts->sample_branches)
 424                 return 0;
 425
 426         for (; sz > bsz; branch += 1, sz -= bsz) {
 427                 if (!branch->from && !branch->to)
 428                         continue;
 429                 intel_bts_get_branch_type(btsq, branch);
 430                 if (btsq->bts->synth_opts.thread_stack)
 431                         thread_stack__event(thread, btsq->cpu, btsq->sample_flags,
 432                                             le64_to_cpu(branch->from),
 433                                             le64_to_cpu(branch->to),
 434                                             btsq->intel_pt_insn.length,
 435                                             buffer->buffer_nr + 1, true, 0, 0);
 436                 if (filter && !(filter & btsq->sample_flags))
 437                         continue;
 438                 err = intel_bts_synth_branch_sample(btsq, branch);
 439                 if (err)
 440                         break;
 441         }
 442         return err;
 443 }
 444
 445 static int intel_bts_process_queue(struct intel_bts_queue *btsq, u64 *timestamp)
 446 {
 447         struct auxtrace_buffer *buffer = btsq->buffer, *old_buffer = buffer;
 448         struct auxtrace_queue *queue;
 449         struct thread *thread;
 450         int err;
 451
 452         if (btsq->done)
 453                 return 1;
 454
 455         if (btsq->pid == -1) {
 456                 thread = machine__find_thread(btsq->bts->machine, -1,
 457                                               btsq->tid);
 458                 if (thread)
 459                         btsq->pid = thread->pid_;
 460         } else {
 461                 thread = machine__findnew_thread(btsq->bts->machine, btsq->pid,
 462                                                  btsq->tid);
 463         }
 464
 465         queue = &btsq->bts->queues.queue_array[btsq->queue_nr];
 466
 467         if (!buffer)
 468                 buffer = auxtrace_buffer__next(queue, NULL);
 469
 470         if (!buffer) {
 471                 if (!btsq->bts->sampling_mode)
 472                         btsq->done = 1;
 473                 err = 1;
 474                 goto out_put;
 475         }
 476
 477         /* Currently there is no support for split buffers */
 478         if (buffer->consecutive) {
 479                 err = -EINVAL;
 480                 goto out_put;
 481         }
 482
 483         if (!buffer->data) {
 484                 int fd = perf_data__fd(btsq->bts->session->data);
 485
 486                 buffer->data = auxtrace_buffer__get_data(buffer, fd);
 487                 if (!buffer->data) {
 488                         err = -ENOMEM;
 489                         goto out_put;
 490                 }
 491         }
 492
 493         if (btsq->bts->snapshot_mode && !buffer->consecutive &&
 494             intel_bts_do_fix_overlap(queue, buffer)) {
 495                 err = -ENOMEM;
 496                 goto out_put;
 497         }
 498
 499         if (!btsq->bts->synth_opts.callchain &&
 500             !btsq->bts->synth_opts.thread_stack && thread &&
 501             (!old_buffer || btsq->bts->sampling_mode ||
 502              (btsq->bts->snapshot_mode && !buffer->consecutive)))
 503                 thread_stack__set_trace_nr(thread, btsq->cpu, buffer->buffer_nr + 1);
 504
 505         err = intel_bts_process_buffer(btsq, buffer, thread);
 506
 507         auxtrace_buffer__drop_data(buffer);
 508
 509         btsq->buffer = auxtrace_buffer__next(queue, buffer);
 510         if (btsq->buffer) {
 511                 if (timestamp)
 512                         *timestamp = btsq->buffer->reference;
 513         } else {
 514                 if (!btsq->bts->sampling_mode)
 515                         btsq->done = 1;
 516         }
 517 out_put:
 518         thread__put(thread);
 519         return err;
 520 }
 521
 522 static int intel_bts_flush_queue(struct intel_bts_queue *btsq)
 523 {
 524         u64 ts = 0;
 525         int ret;
 526
 527         while (1) {
 528                 ret = intel_bts_process_queue(btsq, &ts);
 529                 if (ret < 0)
 530                         return ret;
 531                 if (ret)
 532                         break;
 533         }
 534         return 0;
 535 }
 536
 537 static int intel_bts_process_tid_exit(struct intel_bts *bts, pid_t tid)
 538 {
 539         struct auxtrace_queues *queues = &bts->queues;
 540         unsigned int i;
 541
 542         for (i = 0; i < queues->nr_queues; i++) {
 543                 struct auxtrace_queue *queue = &bts->queues.queue_array[i];
 544                 struct intel_bts_queue *btsq = queue->priv;
 545
 546                 if (btsq && btsq->tid == tid)
 547                         return intel_bts_flush_queue(btsq);
 548         }
 549         return 0;
 550 }
 551
 552 static int intel_bts_process_queues(struct intel_bts *bts, u64 timestamp)
 553 {
 554         while (1) {
 555                 unsigned int queue_nr;
 556                 struct auxtrace_queue *queue;
 557                 struct intel_bts_queue *btsq;
 558                 u64 ts = 0;
 559                 int ret;
 560
 561                 if (!bts->heap.heap_cnt)
 562                         return 0;
 563
 564                 if (bts->heap.heap_array[0].ordinal > timestamp)
 565                         return 0;
 566
 567                 queue_nr = bts->heap.heap_array[0].queue_nr;
 568                 queue = &bts->queues.queue_array[queue_nr];
 569                 btsq = queue->priv;
 570
 571                 auxtrace_heap__pop(&bts->heap);
 572
 573                 ret = intel_bts_process_queue(btsq, &ts);
 574                 if (ret < 0) {
 575                         auxtrace_heap__add(&bts->heap, queue_nr, ts);
 576                         return ret;
 577                 }
 578
 579                 if (!ret) {
 580                         ret = auxtrace_heap__add(&bts->heap, queue_nr, ts);
 581                         if (ret < 0)
 582                                 return ret;
 583                 } else {
 584                         btsq->on_heap = false;
 585                 }
 586         }
 587
 588         return 0;
 589 }
 590
 591 static int intel_bts_process_event(struct perf_session *session,
 592                                    union perf_event *event,
 593                                    struct perf_sample *sample,
 594                                    struct perf_tool *tool)
 595 {
 596         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 597                                              auxtrace);
 598         u64 timestamp;
 599         int err;
 600
 601         if (dump_trace)
 602                 return 0;
 603
 604         if (!tool->ordered_events) {
 605                 pr_err("Intel BTS requires ordered events\n");
 606                 return -EINVAL;
 607         }
 608
 609         if (sample->time && sample->time != (u64)-1)
 610                 timestamp = perf_time_to_tsc(sample->time, &bts->tc);
 611         else
 612                 timestamp = 0;
 613
 614         err = intel_bts_update_queues(bts);
 615         if (err)
 616                 return err;
 617
 618         err = intel_bts_process_queues(bts, timestamp);
 619         if (err)
 620                 return err;
 621         if (event->header.type == PERF_RECORD_EXIT) {
 622                 err = intel_bts_process_tid_exit(bts, event->fork.tid);
 623                 if (err)
 624                         return err;
 625         }
 626
 627         if (event->header.type == PERF_RECORD_AUX &&
 628             (event->aux.flags & PERF_AUX_FLAG_TRUNCATED) &&
 629             bts->synth_opts.errors)
 630                 err = intel_bts_lost(bts, sample);
 631
 632         return err;
 633 }
 634
 635 static int intel_bts_process_auxtrace_event(struct perf_session *session,
 636                                             union perf_event *event,
 637                                             struct perf_tool *tool __maybe_unused)
 638 {
 639         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 640                                              auxtrace);
 641
 642         if (bts->sampling_mode)
 643                 return 0;
 644
 645         if (!bts->data_queued) {
 646                 struct auxtrace_buffer *buffer;
 647                 off_t data_offset;
 648                 int fd = perf_data__fd(session->data);
 649                 int err;
 650
 651                 if (perf_data__is_pipe(session->data)) {
 652                         data_offset = 0;
 653                 } else {
 654                         data_offset = lseek(fd, 0, SEEK_CUR);
 655                         if (data_offset == -1)
 656                                 return -errno;
 657                 }
 658
 659                 err = auxtrace_queues__add_event(&bts->queues, session, event,
 660                                                  data_offset, &buffer);
 661                 if (err)
 662                         return err;
 663
 664                 /* Dump here now we have copied a piped trace out of the pipe */
 665                 if (dump_trace) {
 666                         if (auxtrace_buffer__get_data(buffer, fd)) {
 667                                 intel_bts_dump_event(bts, buffer->data,
 668                                                      buffer->size);
 669                                 auxtrace_buffer__put_data(buffer);
 670                         }
 671                 }
 672         }
 673
 674         return 0;
 675 }
 676
 677 static int intel_bts_flush(struct perf_session *session,
 678                            struct perf_tool *tool __maybe_unused)
 679 {
 680         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 681                                              auxtrace);
 682         int ret;
 683
 684         if (dump_trace || bts->sampling_mode)
 685                 return 0;
 686
 687         if (!tool->ordered_events)
 688                 return -EINVAL;
 689
 690         ret = intel_bts_update_queues(bts);
 691         if (ret < 0)
 692                 return ret;
 693
 694         return intel_bts_process_queues(bts, MAX_TIMESTAMP);
 695 }
 696
 697 static void intel_bts_free_queue(void *priv)
 698 {
 699         struct intel_bts_queue *btsq = priv;
 700
 701         if (!btsq)
 702                 return;
 703         free(btsq);
 704 }
 705
 706 static void intel_bts_free_events(struct perf_session *session)
 707 {
 708         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 709                                              auxtrace);
 710         struct auxtrace_queues *queues = &bts->queues;
 711         unsigned int i;
 712
 713         for (i = 0; i < queues->nr_queues; i++) {
 714                 intel_bts_free_queue(queues->queue_array[i].priv);
 715                 queues->queue_array[i].priv = NULL;
 716         }
 717         auxtrace_queues__free(queues);
 718 }
 719
 720 static void intel_bts_free(struct perf_session *session)
 721 {
 722         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 723                                              auxtrace);
 724
 725         auxtrace_heap__free(&bts->heap);
 726         intel_bts_free_events(session);
 727         session->auxtrace = NULL;
 728         free(bts);
 729 }
 730
 731 static bool intel_bts_evsel_is_auxtrace(struct perf_session *session,
 732                                         struct evsel *evsel)
 733 {
 734         struct intel_bts *bts = container_of(session->auxtrace, struct intel_bts,
 735                                              auxtrace);
 736
 737         return evsel->core.attr.type == bts->pmu_type;
 738 }
 739
 740 struct intel_bts_synth {
 741         struct perf_tool dummy_tool;
 742         struct perf_session *session;
 743 };
 744
 745 static int intel_bts_event_synth(struct perf_tool *tool,
 746                                  union perf_event *event,
 747                                  struct perf_sample *sample __maybe_unused,
 748                                  struct machine *machine __maybe_unused)
 749 {
 750         struct intel_bts_synth *intel_bts_synth =
 751                         container_of(tool, struct intel_bts_synth, dummy_tool);
 752
 753         return perf_session__deliver_synth_event(intel_bts_synth->session,
 754                                                  event, NULL);
 755 }
 756
 757 static int intel_bts_synth_event(struct perf_session *session,
 758                                  struct perf_event_attr *attr, u64 id)
 759 {
 760         struct intel_bts_synth intel_bts_synth;
 761
 762         memset(&intel_bts_synth, 0, sizeof(struct intel_bts_synth));
 763         intel_bts_synth.session = session;
 764
 765         return perf_event__synthesize_attr(&intel_bts_synth.dummy_tool, attr, 1,
 766                                            &id, intel_bts_event_synth);
 767 }
 768
 769 static int intel_bts_synth_events(struct intel_bts *bts,
 770                                   struct perf_session *session)
 771 {
 772         struct evlist *evlist = session->evlist;
 773         struct evsel *evsel;
 774         struct perf_event_attr attr;
 775         bool found = false;
 776         u64 id;
 777         int err;
 778
 779         evlist__for_each_entry(evlist, evsel) {
 780                 if (evsel->core.attr.type == bts->pmu_type && evsel->core.ids) {
 781                         found = true;
 782                         break;
 783                 }
 784         }
 785
 786         if (!found) {
 787                 pr_debug("There are no selected events with Intel BTS data\n");
 788                 return 0;
 789         }
 790
 791         memset(&attr, 0, sizeof(struct perf_event_attr));
 792         attr.size = sizeof(struct perf_event_attr);
 793         attr.type = PERF_TYPE_HARDWARE;
 794         attr.sample_type = evsel->core.attr.sample_type & PERF_SAMPLE_MASK;
 795         attr.sample_type |= PERF_SAMPLE_IP | PERF_SAMPLE_TID |
 796                             PERF_SAMPLE_PERIOD;
 797         attr.sample_type &= ~(u64)PERF_SAMPLE_TIME;
 798         attr.sample_type &= ~(u64)PERF_SAMPLE_CPU;
 799         attr.exclude_user = evsel->core.attr.exclude_user;
 800         attr.exclude_kernel = evsel->core.attr.exclude_kernel;
 801         attr.exclude_hv = evsel->core.attr.exclude_hv;
 802         attr.exclude_host = evsel->core.attr.exclude_host;
 803         attr.exclude_guest = evsel->core.attr.exclude_guest;
 804         attr.sample_id_all = evsel->core.attr.sample_id_all;
 805         attr.read_format = evsel->core.attr.read_format;
 806
 807         id = evsel->core.id[0] + 1000000000;
 808         if (!id)
 809                 id = 1;
 810
 811         if (bts->synth_opts.branches) {
 812                 attr.config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS;
 813                 attr.sample_period = 1;
 814                 attr.sample_type |= PERF_SAMPLE_ADDR;
 815                 pr_debug("Synthesizing 'branches' event with id %" PRIu64 " sample type %#" PRIx64 "\n",
 816                          id, (u64)attr.sample_type);
 817                 err = intel_bts_synth_event(session, &attr, id);
 818                 if (err) {
 819                         pr_err("%s: failed to synthesize 'branches' event type\n",
 820                                __func__);
 821                         return err;
 822                 }
 823                 bts->sample_branches = true;
 824                 bts->branches_sample_type = attr.sample_type;
 825                 bts->branches_id = id;
 826                 /*
 827                  * We only use sample types from PERF_SAMPLE_MASK so we can use
 828                  * __evsel__sample_size() here.
 829                  */
 830                 bts->branches_event_size = sizeof(struct perf_record_sample) +
 831                                            __evsel__sample_size(attr.sample_type);
 832         }
 833
 834         return 0;
 835 }
 836
 837 static const char * const intel_bts_info_fmts[] = {
 838         [INTEL_BTS_PMU_TYPE]            = "  PMU Type           %"PRId64"\n",
 839         [INTEL_BTS_TIME_SHIFT]          = "  Time Shift         %"PRIu64"\n",
 840         [INTEL_BTS_TIME_MULT]           = "  Time Muliplier     %"PRIu64"\n",
 841         [INTEL_BTS_TIME_ZERO]           = "  Time Zero          %"PRIu64"\n",
 842         [INTEL_BTS_CAP_USER_TIME_ZERO]  = "  Cap Time Zero      %"PRId64"\n",
 843         [INTEL_BTS_SNAPSHOT_MODE]       = "  Snapshot mode      %"PRId64"\n",
 844 };
 845
 846 static void intel_bts_print_info(__u64 *arr, int start, int finish)
 847 {
 848         int i;
 849
 850         if (!dump_trace)
 851                 return;
 852
 853         for (i = start; i <= finish; i++)
 854                 fprintf(stdout, intel_bts_info_fmts[i], arr[i]);
 855 }
 856
 857 int intel_bts_process_auxtrace_info(union perf_event *event,
 858                                     struct perf_session *session)
 859 {
 860         struct perf_record_auxtrace_info *auxtrace_info = &event->auxtrace_info;
 861         size_t min_sz = sizeof(u64) * INTEL_BTS_SNAPSHOT_MODE;
 862         struct intel_bts *bts;
 863         int err;
 864
 865         if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
 866                                         min_sz)
 867                 return -EINVAL;
 868
 869         bts = zalloc(sizeof(struct intel_bts));
 870         if (!bts)
 871                 return -ENOMEM;
 872
 873         err = auxtrace_queues__init(&bts->queues);
 874         if (err)
 875                 goto err_free;
 876
 877         bts->session = session;
 878         bts->machine = &session->machines.host; /* No kvm support */
 879         bts->auxtrace_type = auxtrace_info->type;
 880         bts->pmu_type = auxtrace_info->priv[INTEL_BTS_PMU_TYPE];
 881         bts->tc.time_shift = auxtrace_info->priv[INTEL_BTS_TIME_SHIFT];
 882         bts->tc.time_mult = auxtrace_info->priv[INTEL_BTS_TIME_MULT];
 883         bts->tc.time_zero = auxtrace_info->priv[INTEL_BTS_TIME_ZERO];
 884         bts->cap_user_time_zero =
 885                         auxtrace_info->priv[INTEL_BTS_CAP_USER_TIME_ZERO];
 886         bts->snapshot_mode = auxtrace_info->priv[INTEL_BTS_SNAPSHOT_MODE];
 887
 888         bts->sampling_mode = false;
 889
 890         bts->auxtrace.process_event = intel_bts_process_event;
 891         bts->auxtrace.process_auxtrace_event = intel_bts_process_auxtrace_event;
 892         bts->auxtrace.flush_events = intel_bts_flush;
 893         bts->auxtrace.free_events = intel_bts_free_events;
 894         bts->auxtrace.free = intel_bts_free;
 895         bts->auxtrace.evsel_is_auxtrace = intel_bts_evsel_is_auxtrace;
 896         session->auxtrace = &bts->auxtrace;
 897
 898         intel_bts_print_info(&auxtrace_info->priv[0], INTEL_BTS_PMU_TYPE,
 899                              INTEL_BTS_SNAPSHOT_MODE);
 900
 901         if (dump_trace)
 902                 return 0;
 903
 904         if (session->itrace_synth_opts->set) {
 905                 bts->synth_opts = *session->itrace_synth_opts;
 906         } else {
 907                 itrace_synth_opts__set_default(&bts->synth_opts,
 908                                 session->itrace_synth_opts->default_no_sample);
 909                 bts->synth_opts.thread_stack =
 910                                 session->itrace_synth_opts->thread_stack;
 911         }
 912
 913         if (bts->synth_opts.calls)
 914                 bts->branches_filter |= PERF_IP_FLAG_CALL | PERF_IP_FLAG_ASYNC |
 915                                         PERF_IP_FLAG_TRACE_END;
 916         if (bts->synth_opts.returns)
 917                 bts->branches_filter |= PERF_IP_FLAG_RETURN |
 918                                         PERF_IP_FLAG_TRACE_BEGIN;
 919
 920         err = intel_bts_synth_events(bts, session);
 921         if (err)
 922                 goto err_free_queues;
 923
 924         err = auxtrace_queues__process_index(&bts->queues, session);
 925         if (err)
 926                 goto err_free_queues;
 927
 928         if (bts->queues.populated)
 929                 bts->data_queued = true;
 930
 931         return 0;
 932
 933 err_free_queues:
 934         auxtrace_queues__free(&bts->queues);
 935         session->auxtrace = NULL;
 936 err_free:
 937         free(bts);
 938         return err;
 939 }