tools/perf/util/evsel.c

   1 /*
   2  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
   3  *
   4  * Parts came from builtin-{top,stat,record}.c, see those files for further
   5  * copyright notes.
   6  *
   7  * Released under the GPL v2. (and only v2, not any later version)
   8  */
   9
  10 #include <byteswap.h>
  11 #include "asm/bug.h"
  12 #include "evsel.h"
  13 #include "evlist.h"
  14 #include "util.h"
  15 #include "cpumap.h"
  16 #include "thread_map.h"
  17
  18 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
  19 #define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
  20
  21 int __perf_evsel__sample_size(u64 sample_type)
  22 {
  23         u64 mask = sample_type & PERF_SAMPLE_MASK;
  24         int size = 0;
  25         int i;
  26
  27         for (i = 0; i < 64; i++) {
  28                 if (mask & (1ULL << i))
  29                         size++;
  30         }
  31
  32         size *= sizeof(u64);
  33
  34         return size;
  35 }
  36
  37 static void hists__init(struct hists *hists)
  38 {
  39         memset(hists, 0, sizeof(*hists));
  40         hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
  41         hists->entries_in = &hists->entries_in_array[0];
  42         hists->entries_collapsed = RB_ROOT;
  43         hists->entries = RB_ROOT;
  44         pthread_mutex_init(&hists->lock, NULL);
  45 }
  46
  47 void perf_evsel__init(struct perf_evsel *evsel,
  48                       struct perf_event_attr *attr, int idx)
  49 {
  50         evsel->idx         = idx;
  51         evsel->attr        = *attr;
  52         INIT_LIST_HEAD(&evsel->node);
  53         hists__init(&evsel->hists);
  54 }
  55
  56 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
  57 {
  58         struct perf_evsel *evsel = zalloc(sizeof(*evsel));
  59
  60         if (evsel != NULL)
  61                 perf_evsel__init(evsel, attr, idx);
  62
  63         return evsel;
  64 }
  65
  66 void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts)
  67 {
  68         struct perf_event_attr *attr = &evsel->attr;
  69         int track = !evsel->idx; /* only the first counter needs these */
  70
  71         attr->sample_id_all = opts->sample_id_all_avail ? 1 : 0;
  72         attr->inherit       = !opts->no_inherit;
  73         attr->read_format   = PERF_FORMAT_TOTAL_TIME_ENABLED |
  74                               PERF_FORMAT_TOTAL_TIME_RUNNING |
  75                               PERF_FORMAT_ID;
  76
  77         attr->sample_type  |= PERF_SAMPLE_IP | PERF_SAMPLE_TID;
  78
  79         /*
  80          * We default some events to a 1 default interval. But keep
  81          * it a weak assumption overridable by the user.
  82          */
  83         if (!attr->sample_period || (opts->user_freq != UINT_MAX &&
  84                                      opts->user_interval != ULLONG_MAX)) {
  85                 if (opts->freq) {
  86                         attr->sample_type       |= PERF_SAMPLE_PERIOD;
  87                         attr->freq              = 1;
  88                         attr->sample_freq       = opts->freq;
  89                 } else {
  90                         attr->sample_period = opts->default_interval;
  91                 }
  92         }
  93
  94         if (opts->no_samples)
  95                 attr->sample_freq = 0;
  96
  97         if (opts->inherit_stat)
  98                 attr->inherit_stat = 1;
  99
 100         if (opts->sample_address) {
 101                 attr->sample_type       |= PERF_SAMPLE_ADDR;
 102                 attr->mmap_data = track;
 103         }
 104
 105         if (opts->call_graph)
 106                 attr->sample_type       |= PERF_SAMPLE_CALLCHAIN;
 107
 108         if (opts->system_wide)
 109                 attr->sample_type       |= PERF_SAMPLE_CPU;
 110
 111         if (opts->period)
 112                 attr->sample_type       |= PERF_SAMPLE_PERIOD;
 113
 114         if (opts->sample_id_all_avail &&
 115             (opts->sample_time || opts->system_wide ||
 116              !opts->no_inherit || opts->cpu_list))
 117                 attr->sample_type       |= PERF_SAMPLE_TIME;
 118
 119         if (opts->raw_samples) {
 120                 attr->sample_type       |= PERF_SAMPLE_TIME;
 121                 attr->sample_type       |= PERF_SAMPLE_RAW;
 122                 attr->sample_type       |= PERF_SAMPLE_CPU;
 123         }
 124
 125         if (opts->no_delay) {
 126                 attr->watermark = 0;
 127                 attr->wakeup_events = 1;
 128         }
 129
 130         attr->mmap = track;
 131         attr->comm = track;
 132
 133         if (opts->target_pid == -1 && opts->target_tid == -1 && !opts->system_wide) {
 134                 attr->disabled = 1;
 135                 attr->enable_on_exec = 1;
 136         }
 137 }
 138
 139 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 140 {
 141         int cpu, thread;
 142         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
 143
 144         if (evsel->fd) {
 145                 for (cpu = 0; cpu < ncpus; cpu++) {
 146                         for (thread = 0; thread < nthreads; thread++) {
 147                                 FD(evsel, cpu, thread) = -1;
 148                         }
 149                 }
 150         }
 151
 152         return evsel->fd != NULL ? 0 : -ENOMEM;
 153 }
 154
 155 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
 156 {
 157         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
 158         if (evsel->sample_id == NULL)
 159                 return -ENOMEM;
 160
 161         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
 162         if (evsel->id == NULL) {
 163                 xyarray__delete(evsel->sample_id);
 164                 evsel->sample_id = NULL;
 165                 return -ENOMEM;
 166         }
 167
 168         return 0;
 169 }
 170
 171 int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
 172 {
 173         evsel->counts = zalloc((sizeof(*evsel->counts) +
 174                                 (ncpus * sizeof(struct perf_counts_values))));
 175         return evsel->counts != NULL ? 0 : -ENOMEM;
 176 }
 177
 178 void perf_evsel__free_fd(struct perf_evsel *evsel)
 179 {
 180         xyarray__delete(evsel->fd);
 181         evsel->fd = NULL;
 182 }
 183
 184 void perf_evsel__free_id(struct perf_evsel *evsel)
 185 {
 186         xyarray__delete(evsel->sample_id);
 187         evsel->sample_id = NULL;
 188         free(evsel->id);
 189         evsel->id = NULL;
 190 }
 191
 192 void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
 193 {
 194         int cpu, thread;
 195
 196         for (cpu = 0; cpu < ncpus; cpu++)
 197                 for (thread = 0; thread < nthreads; ++thread) {
 198                         close(FD(evsel, cpu, thread));
 199                         FD(evsel, cpu, thread) = -1;
 200                 }
 201 }
 202
 203 void perf_evsel__exit(struct perf_evsel *evsel)
 204 {
 205         assert(list_empty(&evsel->node));
 206         xyarray__delete(evsel->fd);
 207         xyarray__delete(evsel->sample_id);
 208         free(evsel->id);
 209 }
 210
 211 void perf_evsel__delete(struct perf_evsel *evsel)
 212 {
 213         perf_evsel__exit(evsel);
 214         close_cgroup(evsel->cgrp);
 215         free(evsel->name);
 216         free(evsel);
 217 }
 218
 219 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
 220                               int cpu, int thread, bool scale)
 221 {
 222         struct perf_counts_values count;
 223         size_t nv = scale ? 3 : 1;
 224
 225         if (FD(evsel, cpu, thread) < 0)
 226                 return -EINVAL;
 227
 228         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
 229                 return -ENOMEM;
 230
 231         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
 232                 return -errno;
 233
 234         if (scale) {
 235                 if (count.run == 0)
 236                         count.val = 0;
 237                 else if (count.run < count.ena)
 238                         count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
 239         } else
 240                 count.ena = count.run = 0;
 241
 242         evsel->counts->cpu[cpu] = count;
 243         return 0;
 244 }
 245
 246 int __perf_evsel__read(struct perf_evsel *evsel,
 247                        int ncpus, int nthreads, bool scale)
 248 {
 249         size_t nv = scale ? 3 : 1;
 250         int cpu, thread;
 251         struct perf_counts_values *aggr = &evsel->counts->aggr, count;
 252
 253         aggr->val = aggr->ena = aggr->run = 0;
 254
 255         for (cpu = 0; cpu < ncpus; cpu++) {
 256                 for (thread = 0; thread < nthreads; thread++) {
 257                         if (FD(evsel, cpu, thread) < 0)
 258                                 continue;
 259
 260                         if (readn(FD(evsel, cpu, thread),
 261                                   &count, nv * sizeof(u64)) < 0)
 262                                 return -errno;
 263
 264                         aggr->val += count.val;
 265                         if (scale) {
 266                                 aggr->ena += count.ena;
 267                                 aggr->run += count.run;
 268                         }
 269                 }
 270         }
 271
 272         evsel->counts->scaled = 0;
 273         if (scale) {
 274                 if (aggr->run == 0) {
 275                         evsel->counts->scaled = -1;
 276                         aggr->val = 0;
 277                         return 0;
 278                 }
 279
 280                 if (aggr->run < aggr->ena) {
 281                         evsel->counts->scaled = 1;
 282                         aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
 283                 }
 284         } else
 285                 aggr->ena = aggr->run = 0;
 286
 287         return 0;
 288 }
 289
 290 static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 291                               struct thread_map *threads, bool group,
 292                               struct xyarray *group_fds)
 293 {
 294         int cpu, thread;
 295         unsigned long flags = 0;
 296         int pid = -1, err;
 297
 298         if (evsel->fd == NULL &&
 299             perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
 300                 return -ENOMEM;
 301
 302         if (evsel->cgrp) {
 303                 flags = PERF_FLAG_PID_CGROUP;
 304                 pid = evsel->cgrp->fd;
 305         }
 306
 307         for (cpu = 0; cpu < cpus->nr; cpu++) {
 308                 int group_fd = group_fds ? GROUP_FD(group_fds, cpu) : -1;
 309
 310                 for (thread = 0; thread < threads->nr; thread++) {
 311
 312                         if (!evsel->cgrp)
 313                                 pid = threads->map[thread];
 314
 315                         FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
 316                                                                      pid,
 317                                                                      cpus->map[cpu],
 318                                                                      group_fd, flags);
 319                         if (FD(evsel, cpu, thread) < 0) {
 320                                 err = -errno;
 321                                 goto out_close;
 322                         }
 323
 324                         if (group && group_fd == -1)
 325                                 group_fd = FD(evsel, cpu, thread);
 326                 }
 327         }
 328
 329         return 0;
 330
 331 out_close:
 332         do {
 333                 while (--thread >= 0) {
 334                         close(FD(evsel, cpu, thread));
 335                         FD(evsel, cpu, thread) = -1;
 336                 }
 337                 thread = threads->nr;
 338         } while (--cpu >= 0);
 339         return err;
 340 }
 341
 342 void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
 343 {
 344         if (evsel->fd == NULL)
 345                 return;
 346
 347         perf_evsel__close_fd(evsel, ncpus, nthreads);
 348         perf_evsel__free_fd(evsel);
 349         evsel->fd = NULL;
 350 }
 351
 352 static struct {
 353         struct cpu_map map;
 354         int cpus[1];
 355 } empty_cpu_map = {
 356         .map.nr = 1,
 357         .cpus   = { -1, },
 358 };
 359
 360 static struct {
 361         struct thread_map map;
 362         int threads[1];
 363 } empty_thread_map = {
 364         .map.nr  = 1,
 365         .threads = { -1, },
 366 };
 367
 368 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
 369                      struct thread_map *threads, bool group,
 370                      struct xyarray *group_fd)
 371 {
 372         if (cpus == NULL) {
 373                 /* Work around old compiler warnings about strict aliasing */
 374                 cpus = &empty_cpu_map.map;
 375         }
 376
 377         if (threads == NULL)
 378                 threads = &empty_thread_map.map;
 379
 380         return __perf_evsel__open(evsel, cpus, threads, group, group_fd);
 381 }
 382
 383 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
 384                              struct cpu_map *cpus, bool group,
 385                              struct xyarray *group_fd)
 386 {
 387         return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group,
 388                                   group_fd);
 389 }
 390
 391 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
 392                                 struct thread_map *threads, bool group,
 393                                 struct xyarray *group_fd)
 394 {
 395         return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group,
 396                                   group_fd);
 397 }
 398
 399 static int perf_event__parse_id_sample(const union perf_event *event, u64 type,
 400                                        struct perf_sample *sample)
 401 {
 402         const u64 *array = event->sample.array;
 403
 404         array += ((event->header.size -
 405                    sizeof(event->header)) / sizeof(u64)) - 1;
 406
 407         if (type & PERF_SAMPLE_CPU) {
 408                 u32 *p = (u32 *)array;
 409                 sample->cpu = *p;
 410                 array--;
 411         }
 412
 413         if (type & PERF_SAMPLE_STREAM_ID) {
 414                 sample->stream_id = *array;
 415                 array--;
 416         }
 417
 418         if (type & PERF_SAMPLE_ID) {
 419                 sample->id = *array;
 420                 array--;
 421         }
 422
 423         if (type & PERF_SAMPLE_TIME) {
 424                 sample->time = *array;
 425                 array--;
 426         }
 427
 428         if (type & PERF_SAMPLE_TID) {
 429                 u32 *p = (u32 *)array;
 430                 sample->pid = p[0];
 431                 sample->tid = p[1];
 432         }
 433
 434         return 0;
 435 }
 436
 437 static bool sample_overlap(const union perf_event *event,
 438                            const void *offset, u64 size)
 439 {
 440         const void *base = event;
 441
 442         if (offset + size > base + event->header.size)
 443                 return true;
 444
 445         return false;
 446 }
 447
 448 int perf_event__parse_sample(const union perf_event *event, u64 type,
 449                              int sample_size, bool sample_id_all,
 450                              struct perf_sample *data, bool swapped)
 451 {
 452         const u64 *array;
 453
 454         /*
 455          * used for cross-endian analysis. See git commit 65014ab3
 456          * for why this goofiness is needed.
 457          */
 458         union {
 459                 u64 val64;
 460                 u32 val32[2];
 461         } u;
 462
 463         memset(data, 0, sizeof(*data));
 464         data->cpu = data->pid = data->tid = -1;
 465         data->stream_id = data->id = data->time = -1ULL;
 466
 467         if (event->header.type != PERF_RECORD_SAMPLE) {
 468                 if (!sample_id_all)
 469                         return 0;
 470                 return perf_event__parse_id_sample(event, type, data);
 471         }
 472
 473         array = event->sample.array;
 474
 475         if (sample_size + sizeof(event->header) > event->header.size)
 476                 return -EFAULT;
 477
 478         if (type & PERF_SAMPLE_IP) {
 479                 data->ip = event->ip.ip;
 480                 array++;
 481         }
 482
 483         if (type & PERF_SAMPLE_TID) {
 484                 u.val64 = *array;
 485                 if (swapped) {
 486                         /* undo swap of u64, then swap on individual u32s */
 487                         u.val64 = bswap_64(u.val64);
 488                         u.val32[0] = bswap_32(u.val32[0]);
 489                         u.val32[1] = bswap_32(u.val32[1]);
 490                 }
 491
 492                 data->pid = u.val32[0];
 493                 data->tid = u.val32[1];
 494                 array++;
 495         }
 496
 497         if (type & PERF_SAMPLE_TIME) {
 498                 data->time = *array;
 499                 array++;
 500         }
 501
 502         data->addr = 0;
 503         if (type & PERF_SAMPLE_ADDR) {
 504                 data->addr = *array;
 505                 array++;
 506         }
 507
 508         data->id = -1ULL;
 509         if (type & PERF_SAMPLE_ID) {
 510                 data->id = *array;
 511                 array++;
 512         }
 513
 514         if (type & PERF_SAMPLE_STREAM_ID) {
 515                 data->stream_id = *array;
 516                 array++;
 517         }
 518
 519         if (type & PERF_SAMPLE_CPU) {
 520
 521                 u.val64 = *array;
 522                 if (swapped) {
 523                         /* undo swap of u64, then swap on individual u32s */
 524                         u.val64 = bswap_64(u.val64);
 525                         u.val32[0] = bswap_32(u.val32[0]);
 526                 }
 527
 528                 data->cpu = u.val32[0];
 529                 array++;
 530         }
 531
 532         if (type & PERF_SAMPLE_PERIOD) {
 533                 data->period = *array;
 534                 array++;
 535         }
 536
 537         if (type & PERF_SAMPLE_READ) {
 538                 fprintf(stderr, "PERF_SAMPLE_READ is unsuported for now\n");
 539                 return -1;
 540         }
 541
 542         if (type & PERF_SAMPLE_CALLCHAIN) {
 543                 if (sample_overlap(event, array, sizeof(data->callchain->nr)))
 544                         return -EFAULT;
 545
 546                 data->callchain = (struct ip_callchain *)array;
 547
 548                 if (sample_overlap(event, array, data->callchain->nr))
 549                         return -EFAULT;
 550
 551                 array += 1 + data->callchain->nr;
 552         }
 553
 554         if (type & PERF_SAMPLE_RAW) {
 555                 const u64 *pdata;
 556
 557                 u.val64 = *array;
 558                 if (WARN_ONCE(swapped,
 559                               "Endianness of raw data not corrected!\n")) {
 560                         /* undo swap of u64, then swap on individual u32s */
 561                         u.val64 = bswap_64(u.val64);
 562                         u.val32[0] = bswap_32(u.val32[0]);
 563                         u.val32[1] = bswap_32(u.val32[1]);
 564                 }
 565
 566                 if (sample_overlap(event, array, sizeof(u32)))
 567                         return -EFAULT;
 568
 569                 data->raw_size = u.val32[0];
 570                 pdata = (void *) array + sizeof(u32);
 571
 572                 if (sample_overlap(event, pdata, data->raw_size))
 573                         return -EFAULT;
 574
 575                 data->raw_data = (void *) pdata;
 576         }
 577
 578         return 0;
 579 }
 580
 581 int perf_event__synthesize_sample(union perf_event *event, u64 type,
 582                                   const struct perf_sample *sample,
 583                                   bool swapped)
 584 {
 585         u64 *array;
 586
 587         /*
 588          * used for cross-endian analysis. See git commit 65014ab3
 589          * for why this goofiness is needed.
 590          */
 591         union {
 592                 u64 val64;
 593                 u32 val32[2];
 594         } u;
 595
 596         array = event->sample.array;
 597
 598         if (type & PERF_SAMPLE_IP) {
 599                 event->ip.ip = sample->ip;
 600                 array++;
 601         }
 602
 603         if (type & PERF_SAMPLE_TID) {
 604                 u.val32[0] = sample->pid;
 605                 u.val32[1] = sample->tid;
 606                 if (swapped) {
 607                         /*
 608                          * Inverse of what is done in perf_event__parse_sample
 609                          */
 610                         u.val32[0] = bswap_32(u.val32[0]);
 611                         u.val32[1] = bswap_32(u.val32[1]);
 612                         u.val64 = bswap_64(u.val64);
 613                 }
 614
 615                 *array = u.val64;
 616                 array++;
 617         }
 618
 619         if (type & PERF_SAMPLE_TIME) {
 620                 *array = sample->time;
 621                 array++;
 622         }
 623
 624         if (type & PERF_SAMPLE_ADDR) {
 625                 *array = sample->addr;
 626                 array++;
 627         }
 628
 629         if (type & PERF_SAMPLE_ID) {
 630                 *array = sample->id;
 631                 array++;
 632         }
 633
 634         if (type & PERF_SAMPLE_STREAM_ID) {
 635                 *array = sample->stream_id;
 636                 array++;
 637         }
 638
 639         if (type & PERF_SAMPLE_CPU) {
 640                 u.val32[0] = sample->cpu;
 641                 if (swapped) {
 642                         /*
 643                          * Inverse of what is done in perf_event__parse_sample
 644                          */
 645                         u.val32[0] = bswap_32(u.val32[0]);
 646                         u.val64 = bswap_64(u.val64);
 647                 }
 648                 *array = u.val64;
 649                 array++;
 650         }
 651
 652         if (type & PERF_SAMPLE_PERIOD) {
 653                 *array = sample->period;
 654                 array++;
 655         }
 656
 657         return 0;
 658 }