kernel/tools/perf/builtin-kvm.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/evsel.h"
   5 #include "util/evlist.h"
   6 #include "util/util.h"
   7 #include "util/cache.h"
   8 #include "util/symbol.h"
   9 #include "util/thread.h"
  10 #include "util/header.h"
  11 #include "util/session.h"
  12 #include "util/intlist.h"
  13 #include "util/parse-options.h"
  14 #include "util/trace-event.h"
  15 #include "util/debug.h"
  16 #include <api/fs/debugfs.h>
  17 #include "util/tool.h"
  18 #include "util/stat.h"
  19 #include "util/top.h"
  20 #include "util/data.h"
  21 #include "util/ordered-events.h"
  22
  23 #include <sys/prctl.h>
  24 #ifdef HAVE_TIMERFD_SUPPORT
  25 #include <sys/timerfd.h>
  26 #endif
  27
  28 #include <termios.h>
  29 #include <semaphore.h>
  30 #include <pthread.h>
  31 #include <math.h>
  32
  33 #ifdef HAVE_KVM_STAT_SUPPORT
  34 #include <asm/kvm_perf.h>
  35 #include "util/kvm-stat.h"
  36
  37 void exit_event_get_key(struct perf_evsel *evsel,
  38                         struct perf_sample *sample,
  39                         struct event_key *key)
  40 {
  41         key->info = 0;
  42         key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON);
  43 }
  44
  45 bool kvm_exit_event(struct perf_evsel *evsel)
  46 {
  47         return !strcmp(evsel->name, KVM_EXIT_TRACE);
  48 }
  49
  50 bool exit_event_begin(struct perf_evsel *evsel,
  51                       struct perf_sample *sample, struct event_key *key)
  52 {
  53         if (kvm_exit_event(evsel)) {
  54                 exit_event_get_key(evsel, sample, key);
  55                 return true;
  56         }
  57
  58         return false;
  59 }
  60
  61 bool kvm_entry_event(struct perf_evsel *evsel)
  62 {
  63         return !strcmp(evsel->name, KVM_ENTRY_TRACE);
  64 }
  65
  66 bool exit_event_end(struct perf_evsel *evsel,
  67                     struct perf_sample *sample __maybe_unused,
  68                     struct event_key *key __maybe_unused)
  69 {
  70         return kvm_entry_event(evsel);
  71 }
  72
  73 static const char *get_exit_reason(struct perf_kvm_stat *kvm,
  74                                    struct exit_reasons_table *tbl,
  75                                    u64 exit_code)
  76 {
  77         while (tbl->reason != NULL) {
  78                 if (tbl->exit_code == exit_code)
  79                         return tbl->reason;
  80                 tbl++;
  81         }
  82
  83         pr_err("unknown kvm exit code:%lld on %s\n",
  84                 (unsigned long long)exit_code, kvm->exit_reasons_isa);
  85         return "UNKNOWN";
  86 }
  87
  88 void exit_event_decode_key(struct perf_kvm_stat *kvm,
  89                            struct event_key *key,
  90                            char *decode)
  91 {
  92         const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
  93                                                   key->key);
  94
  95         scnprintf(decode, DECODE_STR_LEN, "%s", exit_reason);
  96 }
  97
  98 static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
  99 {
 100         struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
 101
 102         for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
 103                 if (!strcmp(events_ops->name, kvm->report_event)) {
 104                         kvm->events_ops = events_ops->ops;
 105                         return true;
 106                 }
 107         }
 108
 109         return false;
 110 }
 111
 112 struct vcpu_event_record {
 113         int vcpu_id;
 114         u64 start_time;
 115         struct kvm_event *last_event;
 116 };
 117
 118
 119 static void init_kvm_event_record(struct perf_kvm_stat *kvm)
 120 {
 121         unsigned int i;
 122
 123         for (i = 0; i < EVENTS_CACHE_SIZE; i++)
 124                 INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
 125 }
 126
 127 #ifdef HAVE_TIMERFD_SUPPORT
 128 static void clear_events_cache_stats(struct list_head *kvm_events_cache)
 129 {
 130         struct list_head *head;
 131         struct kvm_event *event;
 132         unsigned int i;
 133         int j;
 134
 135         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 136                 head = &kvm_events_cache[i];
 137                 list_for_each_entry(event, head, hash_entry) {
 138                         /* reset stats for event */
 139                         event->total.time = 0;
 140                         init_stats(&event->total.stats);
 141
 142                         for (j = 0; j < event->max_vcpu; ++j) {
 143                                 event->vcpu[j].time = 0;
 144                                 init_stats(&event->vcpu[j].stats);
 145                         }
 146                 }
 147         }
 148 }
 149 #endif
 150
 151 static int kvm_events_hash_fn(u64 key)
 152 {
 153         return key & (EVENTS_CACHE_SIZE - 1);
 154 }
 155
 156 static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
 157 {
 158         int old_max_vcpu = event->max_vcpu;
 159         void *prev;
 160
 161         if (vcpu_id < event->max_vcpu)
 162                 return true;
 163
 164         while (event->max_vcpu <= vcpu_id)
 165                 event->max_vcpu += DEFAULT_VCPU_NUM;
 166
 167         prev = event->vcpu;
 168         event->vcpu = realloc(event->vcpu,
 169                               event->max_vcpu * sizeof(*event->vcpu));
 170         if (!event->vcpu) {
 171                 free(prev);
 172                 pr_err("Not enough memory\n");
 173                 return false;
 174         }
 175
 176         memset(event->vcpu + old_max_vcpu, 0,
 177                (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
 178         return true;
 179 }
 180
 181 static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
 182 {
 183         struct kvm_event *event;
 184
 185         event = zalloc(sizeof(*event));
 186         if (!event) {
 187                 pr_err("Not enough memory\n");
 188                 return NULL;
 189         }
 190
 191         event->key = *key;
 192         init_stats(&event->total.stats);
 193         return event;
 194 }
 195
 196 static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
 197                                                struct event_key *key)
 198 {
 199         struct kvm_event *event;
 200         struct list_head *head;
 201
 202         BUG_ON(key->key == INVALID_KEY);
 203
 204         head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
 205         list_for_each_entry(event, head, hash_entry) {
 206                 if (event->key.key == key->key && event->key.info == key->info)
 207                         return event;
 208         }
 209
 210         event = kvm_alloc_init_event(key);
 211         if (!event)
 212                 return NULL;
 213
 214         list_add(&event->hash_entry, head);
 215         return event;
 216 }
 217
 218 static bool handle_begin_event(struct perf_kvm_stat *kvm,
 219                                struct vcpu_event_record *vcpu_record,
 220                                struct event_key *key, u64 timestamp)
 221 {
 222         struct kvm_event *event = NULL;
 223
 224         if (key->key != INVALID_KEY)
 225                 event = find_create_kvm_event(kvm, key);
 226
 227         vcpu_record->last_event = event;
 228         vcpu_record->start_time = timestamp;
 229         return true;
 230 }
 231
 232 static void
 233 kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
 234 {
 235         kvm_stats->time += time_diff;
 236         update_stats(&kvm_stats->stats, time_diff);
 237 }
 238
 239 static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 240 {
 241         struct kvm_event_stats *kvm_stats = &event->total;
 242
 243         if (vcpu_id != -1)
 244                 kvm_stats = &event->vcpu[vcpu_id];
 245
 246         return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
 247                                 avg_stats(&kvm_stats->stats));
 248 }
 249
 250 static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 251                              u64 time_diff)
 252 {
 253         if (vcpu_id == -1) {
 254                 kvm_update_event_stats(&event->total, time_diff);
 255                 return true;
 256         }
 257
 258         if (!kvm_event_expand(event, vcpu_id))
 259                 return false;
 260
 261         kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
 262         return true;
 263 }
 264
 265 static bool is_child_event(struct perf_kvm_stat *kvm,
 266                            struct perf_evsel *evsel,
 267                            struct perf_sample *sample,
 268                            struct event_key *key)
 269 {
 270         struct child_event_ops *child_ops;
 271
 272         child_ops = kvm->events_ops->child_ops;
 273
 274         if (!child_ops)
 275                 return false;
 276
 277         for (; child_ops->name; child_ops++) {
 278                 if (!strcmp(evsel->name, child_ops->name)) {
 279                         child_ops->get_key(evsel, sample, key);
 280                         return true;
 281                 }
 282         }
 283
 284         return false;
 285 }
 286
 287 static bool handle_child_event(struct perf_kvm_stat *kvm,
 288                                struct vcpu_event_record *vcpu_record,
 289                                struct event_key *key,
 290                                struct perf_sample *sample __maybe_unused)
 291 {
 292         struct kvm_event *event = NULL;
 293
 294         if (key->key != INVALID_KEY)
 295                 event = find_create_kvm_event(kvm, key);
 296
 297         vcpu_record->last_event = event;
 298
 299         return true;
 300 }
 301
 302 static bool skip_event(const char *event)
 303 {
 304         const char * const *skip_events;
 305
 306         for (skip_events = kvm_skip_events; *skip_events; skip_events++)
 307                 if (!strcmp(event, *skip_events))
 308                         return true;
 309
 310         return false;
 311 }
 312
 313 static bool handle_end_event(struct perf_kvm_stat *kvm,
 314                              struct vcpu_event_record *vcpu_record,
 315                              struct event_key *key,
 316                              struct perf_sample *sample)
 317 {
 318         struct kvm_event *event;
 319         u64 time_begin, time_diff;
 320         int vcpu;
 321
 322         if (kvm->trace_vcpu == -1)
 323                 vcpu = -1;
 324         else
 325                 vcpu = vcpu_record->vcpu_id;
 326
 327         event = vcpu_record->last_event;
 328         time_begin = vcpu_record->start_time;
 329
 330         /* The begin event is not caught. */
 331         if (!time_begin)
 332                 return true;
 333
 334         /*
 335          * In some case, the 'begin event' only records the start timestamp,
 336          * the actual event is recognized in the 'end event' (e.g. mmio-event).
 337          */
 338
 339         /* Both begin and end events did not get the key. */
 340         if (!event && key->key == INVALID_KEY)
 341                 return true;
 342
 343         if (!event)
 344                 event = find_create_kvm_event(kvm, key);
 345
 346         if (!event)
 347                 return false;
 348
 349         vcpu_record->last_event = NULL;
 350         vcpu_record->start_time = 0;
 351
 352         /* seems to happen once in a while during live mode */
 353         if (sample->time < time_begin) {
 354                 pr_debug("End time before begin time; skipping event.\n");
 355                 return true;
 356         }
 357
 358         time_diff = sample->time - time_begin;
 359
 360         if (kvm->duration && time_diff > kvm->duration) {
 361                 char decode[DECODE_STR_LEN];
 362
 363                 kvm->events_ops->decode_key(kvm, &event->key, decode);
 364                 if (!skip_event(decode)) {
 365                         pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
 366                                  sample->time, sample->pid, vcpu_record->vcpu_id,
 367                                  decode, time_diff/1000);
 368                 }
 369         }
 370
 371         return update_kvm_event(event, vcpu, time_diff);
 372 }
 373
 374 static
 375 struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 376                                           struct perf_evsel *evsel,
 377                                           struct perf_sample *sample)
 378 {
 379         /* Only kvm_entry records vcpu id. */
 380         if (!thread__priv(thread) && kvm_entry_event(evsel)) {
 381                 struct vcpu_event_record *vcpu_record;
 382
 383                 vcpu_record = zalloc(sizeof(*vcpu_record));
 384                 if (!vcpu_record) {
 385                         pr_err("%s: Not enough memory\n", __func__);
 386                         return NULL;
 387                 }
 388
 389                 vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample, VCPU_ID);
 390                 thread__set_priv(thread, vcpu_record);
 391         }
 392
 393         return thread__priv(thread);
 394 }
 395
 396 static bool handle_kvm_event(struct perf_kvm_stat *kvm,
 397                              struct thread *thread,
 398                              struct perf_evsel *evsel,
 399                              struct perf_sample *sample)
 400 {
 401         struct vcpu_event_record *vcpu_record;
 402         struct event_key key = { .key = INVALID_KEY,
 403                                  .exit_reasons = kvm->exit_reasons };
 404
 405         vcpu_record = per_vcpu_record(thread, evsel, sample);
 406         if (!vcpu_record)
 407                 return true;
 408
 409         /* only process events for vcpus user cares about */
 410         if ((kvm->trace_vcpu != -1) &&
 411             (kvm->trace_vcpu != vcpu_record->vcpu_id))
 412                 return true;
 413
 414         if (kvm->events_ops->is_begin_event(evsel, sample, &key))
 415                 return handle_begin_event(kvm, vcpu_record, &key, sample->time);
 416
 417         if (is_child_event(kvm, evsel, sample, &key))
 418                 return handle_child_event(kvm, vcpu_record, &key, sample);
 419
 420         if (kvm->events_ops->is_end_event(evsel, sample, &key))
 421                 return handle_end_event(kvm, vcpu_record, &key, sample);
 422
 423         return true;
 424 }
 425
 426 #define GET_EVENT_KEY(func, field)                                      \
 427 static u64 get_event_ ##func(struct kvm_event *event, int vcpu)         \
 428 {                                                                       \
 429         if (vcpu == -1)                                                 \
 430                 return event->total.field;                              \
 431                                                                         \
 432         if (vcpu >= event->max_vcpu)                                    \
 433                 return 0;                                               \
 434                                                                         \
 435         return event->vcpu[vcpu].field;                                 \
 436 }
 437
 438 #define COMPARE_EVENT_KEY(func, field)                                  \
 439 GET_EVENT_KEY(func, field)                                              \
 440 static int compare_kvm_event_ ## func(struct kvm_event *one,            \
 441                                         struct kvm_event *two, int vcpu)\
 442 {                                                                       \
 443         return get_event_ ##func(one, vcpu) >                           \
 444                                 get_event_ ##func(two, vcpu);           \
 445 }
 446
 447 GET_EVENT_KEY(time, time);
 448 COMPARE_EVENT_KEY(count, stats.n);
 449 COMPARE_EVENT_KEY(mean, stats.mean);
 450 GET_EVENT_KEY(max, stats.max);
 451 GET_EVENT_KEY(min, stats.min);
 452
 453 #define DEF_SORT_NAME_KEY(name, compare_key)                            \
 454         { #name, compare_kvm_event_ ## compare_key }
 455
 456 static struct kvm_event_key keys[] = {
 457         DEF_SORT_NAME_KEY(sample, count),
 458         DEF_SORT_NAME_KEY(time, mean),
 459         { NULL, NULL }
 460 };
 461
 462 static bool select_key(struct perf_kvm_stat *kvm)
 463 {
 464         int i;
 465
 466         for (i = 0; keys[i].name; i++) {
 467                 if (!strcmp(keys[i].name, kvm->sort_key)) {
 468                         kvm->compare = keys[i].key;
 469                         return true;
 470                 }
 471         }
 472
 473         pr_err("Unknown compare key:%s\n", kvm->sort_key);
 474         return false;
 475 }
 476
 477 static void insert_to_result(struct rb_root *result, struct kvm_event *event,
 478                              key_cmp_fun bigger, int vcpu)
 479 {
 480         struct rb_node **rb = &result->rb_node;
 481         struct rb_node *parent = NULL;
 482         struct kvm_event *p;
 483
 484         while (*rb) {
 485                 p = container_of(*rb, struct kvm_event, rb);
 486                 parent = *rb;
 487
 488                 if (bigger(event, p, vcpu))
 489                         rb = &(*rb)->rb_left;
 490                 else
 491                         rb = &(*rb)->rb_right;
 492         }
 493
 494         rb_link_node(&event->rb, parent, rb);
 495         rb_insert_color(&event->rb, result);
 496 }
 497
 498 static void
 499 update_total_count(struct perf_kvm_stat *kvm, struct kvm_event *event)
 500 {
 501         int vcpu = kvm->trace_vcpu;
 502
 503         kvm->total_count += get_event_count(event, vcpu);
 504         kvm->total_time += get_event_time(event, vcpu);
 505 }
 506
 507 static bool event_is_valid(struct kvm_event *event, int vcpu)
 508 {
 509         return !!get_event_count(event, vcpu);
 510 }
 511
 512 static void sort_result(struct perf_kvm_stat *kvm)
 513 {
 514         unsigned int i;
 515         int vcpu = kvm->trace_vcpu;
 516         struct kvm_event *event;
 517
 518         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 519                 list_for_each_entry(event, &kvm->kvm_events_cache[i], hash_entry) {
 520                         if (event_is_valid(event, vcpu)) {
 521                                 update_total_count(kvm, event);
 522                                 insert_to_result(&kvm->result, event,
 523                                                  kvm->compare, vcpu);
 524                         }
 525                 }
 526         }
 527 }
 528
 529 /* returns left most element of result, and erase it */
 530 static struct kvm_event *pop_from_result(struct rb_root *result)
 531 {
 532         struct rb_node *node = rb_first(result);
 533
 534         if (!node)
 535                 return NULL;
 536
 537         rb_erase(node, result);
 538         return container_of(node, struct kvm_event, rb);
 539 }
 540
 541 static void print_vcpu_info(struct perf_kvm_stat *kvm)
 542 {
 543         int vcpu = kvm->trace_vcpu;
 544
 545         pr_info("Analyze events for ");
 546
 547         if (kvm->opts.target.system_wide)
 548                 pr_info("all VMs, ");
 549         else if (kvm->opts.target.pid)
 550                 pr_info("pid(s) %s, ", kvm->opts.target.pid);
 551         else
 552                 pr_info("dazed and confused on what is monitored, ");
 553
 554         if (vcpu == -1)
 555                 pr_info("all VCPUs:\n\n");
 556         else
 557                 pr_info("VCPU %d:\n\n", vcpu);
 558 }
 559
 560 static void show_timeofday(void)
 561 {
 562         char date[64];
 563         struct timeval tv;
 564         struct tm ltime;
 565
 566         gettimeofday(&tv, NULL);
 567         if (localtime_r(&tv.tv_sec, &ltime)) {
 568                 strftime(date, sizeof(date), "%H:%M:%S", &ltime);
 569                 pr_info("%s.%06ld", date, tv.tv_usec);
 570         } else
 571                 pr_info("00:00:00.000000");
 572
 573         return;
 574 }
 575
 576 static void print_result(struct perf_kvm_stat *kvm)
 577 {
 578         char decode[DECODE_STR_LEN];
 579         struct kvm_event *event;
 580         int vcpu = kvm->trace_vcpu;
 581
 582         if (kvm->live) {
 583                 puts(CONSOLE_CLEAR);
 584                 show_timeofday();
 585         }
 586
 587         pr_info("\n\n");
 588         print_vcpu_info(kvm);
 589         pr_info("%*s ", DECODE_STR_LEN, kvm->events_ops->name);
 590         pr_info("%10s ", "Samples");
 591         pr_info("%9s ", "Samples%");
 592
 593         pr_info("%9s ", "Time%");
 594         pr_info("%11s ", "Min Time");
 595         pr_info("%11s ", "Max Time");
 596         pr_info("%16s ", "Avg time");
 597         pr_info("\n\n");
 598
 599         while ((event = pop_from_result(&kvm->result))) {
 600                 u64 ecount, etime, max, min;
 601
 602                 ecount = get_event_count(event, vcpu);
 603                 etime = get_event_time(event, vcpu);
 604                 max = get_event_max(event, vcpu);
 605                 min = get_event_min(event, vcpu);
 606
 607                 kvm->events_ops->decode_key(kvm, &event->key, decode);
 608                 pr_info("%*s ", DECODE_STR_LEN, decode);
 609                 pr_info("%10llu ", (unsigned long long)ecount);
 610                 pr_info("%8.2f%% ", (double)ecount / kvm->total_count * 100);
 611                 pr_info("%8.2f%% ", (double)etime / kvm->total_time * 100);
 612                 pr_info("%9.2fus ", (double)min / 1e3);
 613                 pr_info("%9.2fus ", (double)max / 1e3);
 614                 pr_info("%9.2fus ( +-%7.2f%% )", (double)etime / ecount/1e3,
 615                         kvm_event_rel_stddev(vcpu, event));
 616                 pr_info("\n");
 617         }
 618
 619         pr_info("\nTotal Samples:%" PRIu64 ", Total events handled time:%.2fus.\n\n",
 620                 kvm->total_count, kvm->total_time / 1e3);
 621
 622         if (kvm->lost_events)
 623                 pr_info("\nLost events: %" PRIu64 "\n\n", kvm->lost_events);
 624 }
 625
 626 #ifdef HAVE_TIMERFD_SUPPORT
 627 static int process_lost_event(struct perf_tool *tool,
 628                               union perf_event *event __maybe_unused,
 629                               struct perf_sample *sample __maybe_unused,
 630                               struct machine *machine __maybe_unused)
 631 {
 632         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat, tool);
 633
 634         kvm->lost_events++;
 635         return 0;
 636 }
 637 #endif
 638
 639 static bool skip_sample(struct perf_kvm_stat *kvm,
 640                         struct perf_sample *sample)
 641 {
 642         if (kvm->pid_list && intlist__find(kvm->pid_list, sample->pid) == NULL)
 643                 return true;
 644
 645         return false;
 646 }
 647
 648 static int process_sample_event(struct perf_tool *tool,
 649                                 union perf_event *event,
 650                                 struct perf_sample *sample,
 651                                 struct perf_evsel *evsel,
 652                                 struct machine *machine)
 653 {
 654         struct thread *thread;
 655         struct perf_kvm_stat *kvm = container_of(tool, struct perf_kvm_stat,
 656                                                  tool);
 657
 658         if (skip_sample(kvm, sample))
 659                 return 0;
 660
 661         thread = machine__findnew_thread(machine, sample->pid, sample->tid);
 662         if (thread == NULL) {
 663                 pr_debug("problem processing %d event, skipping it.\n",
 664                         event->header.type);
 665                 return -1;
 666         }
 667
 668         if (!handle_kvm_event(kvm, thread, evsel, sample))
 669                 return -1;
 670
 671         return 0;
 672 }
 673
 674 static int cpu_isa_config(struct perf_kvm_stat *kvm)
 675 {
 676         char buf[64], *cpuid;
 677         int err;
 678
 679         if (kvm->live) {
 680                 err = get_cpuid(buf, sizeof(buf));
 681                 if (err != 0) {
 682                         pr_err("Failed to look up CPU type\n");
 683                         return err;
 684                 }
 685                 cpuid = buf;
 686         } else
 687                 cpuid = kvm->session->header.env.cpuid;
 688
 689         if (!cpuid) {
 690                 pr_err("Failed to look up CPU type\n");
 691                 return -EINVAL;
 692         }
 693
 694         err = cpu_isa_init(kvm, cpuid);
 695         if (err == -ENOTSUP)
 696                 pr_err("CPU %s is not supported.\n", cpuid);
 697
 698         return err;
 699 }
 700
 701 static bool verify_vcpu(int vcpu)
 702 {
 703         if (vcpu != -1 && vcpu < 0) {
 704                 pr_err("Invalid vcpu:%d.\n", vcpu);
 705                 return false;
 706         }
 707
 708         return true;
 709 }
 710
 711 #ifdef HAVE_TIMERFD_SUPPORT
 712 /* keeping the max events to a modest level to keep
 713  * the processing of samples per mmap smooth.
 714  */
 715 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
 716
 717 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
 718                                    u64 *mmap_time)
 719 {
 720         union perf_event *event;
 721         struct perf_sample sample;
 722         s64 n = 0;
 723         int err;
 724
 725         *mmap_time = ULLONG_MAX;
 726         while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
 727                 err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
 728                 if (err) {
 729                         perf_evlist__mmap_consume(kvm->evlist, idx);
 730                         pr_err("Failed to parse sample\n");
 731                         return -1;
 732                 }
 733
 734                 err = perf_session__queue_event(kvm->session, event, &sample, 0);
 735                 /*
 736                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
 737                  *        point to it, and it'll get possibly overwritten by the kernel.
 738                  */
 739                 perf_evlist__mmap_consume(kvm->evlist, idx);
 740
 741                 if (err) {
 742                         pr_err("Failed to enqueue sample: %d\n", err);
 743                         return -1;
 744                 }
 745
 746                 /* save time stamp of our first sample for this mmap */
 747                 if (n == 0)
 748                         *mmap_time = sample.time;
 749
 750                 /* limit events per mmap handled all at once */
 751                 n++;
 752                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 753                         break;
 754         }
 755
 756         return n;
 757 }
 758
 759 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
 760 {
 761         int i, err, throttled = 0;
 762         s64 n, ntotal = 0;
 763         u64 flush_time = ULLONG_MAX, mmap_time;
 764
 765         for (i = 0; i < kvm->evlist->nr_mmaps; i++) {
 766                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
 767                 if (n < 0)
 768                         return -1;
 769
 770                 /* flush time is going to be the minimum of all the individual
 771                  * mmap times. Essentially, we flush all the samples queued up
 772                  * from the last pass under our minimal start time -- that leaves
 773                  * a very small race for samples to come in with a lower timestamp.
 774                  * The ioctl to return the perf_clock timestamp should close the
 775                  * race entirely.
 776                  */
 777                 if (mmap_time < flush_time)
 778                         flush_time = mmap_time;
 779
 780                 ntotal += n;
 781                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 782                         throttled = 1;
 783         }
 784
 785         /* flush queue after each round in which we processed events */
 786         if (ntotal) {
 787                 struct ordered_events *oe = &kvm->session->ordered_events;
 788
 789                 oe->next_flush = flush_time;
 790                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
 791                 if (err) {
 792                         if (kvm->lost_events)
 793                                 pr_info("\nLost events: %" PRIu64 "\n\n",
 794                                         kvm->lost_events);
 795                         return err;
 796                 }
 797         }
 798
 799         return throttled;
 800 }
 801
 802 static volatile int done;
 803
 804 static void sig_handler(int sig __maybe_unused)
 805 {
 806         done = 1;
 807 }
 808
 809 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
 810 {
 811         struct itimerspec new_value;
 812         int rc = -1;
 813
 814         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
 815         if (kvm->timerfd < 0) {
 816                 pr_err("timerfd_create failed\n");
 817                 goto out;
 818         }
 819
 820         new_value.it_value.tv_sec = kvm->display_time;
 821         new_value.it_value.tv_nsec = 0;
 822         new_value.it_interval.tv_sec = kvm->display_time;
 823         new_value.it_interval.tv_nsec = 0;
 824
 825         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
 826                 pr_err("timerfd_settime failed: %d\n", errno);
 827                 close(kvm->timerfd);
 828                 goto out;
 829         }
 830
 831         rc = 0;
 832 out:
 833         return rc;
 834 }
 835
 836 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
 837 {
 838         uint64_t c;
 839         int rc;
 840
 841         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
 842         if (rc < 0) {
 843                 if (errno == EAGAIN)
 844                         return 0;
 845
 846                 pr_err("Failed to read timer fd: %d\n", errno);
 847                 return -1;
 848         }
 849
 850         if (rc != sizeof(uint64_t)) {
 851                 pr_err("Error reading timer fd - invalid size returned\n");
 852                 return -1;
 853         }
 854
 855         if (c != 1)
 856                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
 857
 858         /* update display */
 859         sort_result(kvm);
 860         print_result(kvm);
 861
 862         /* reset counts */
 863         clear_events_cache_stats(kvm->kvm_events_cache);
 864         kvm->total_count = 0;
 865         kvm->total_time = 0;
 866         kvm->lost_events = 0;
 867
 868         return 0;
 869 }
 870
 871 static int fd_set_nonblock(int fd)
 872 {
 873         long arg = 0;
 874
 875         arg = fcntl(fd, F_GETFL);
 876         if (arg < 0) {
 877                 pr_err("Failed to get current flags for fd %d\n", fd);
 878                 return -1;
 879         }
 880
 881         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
 882                 pr_err("Failed to set non-block option on fd %d\n", fd);
 883                 return -1;
 884         }
 885
 886         return 0;
 887 }
 888
 889 static int perf_kvm__handle_stdin(void)
 890 {
 891         int c;
 892
 893         c = getc(stdin);
 894         if (c == 'q')
 895                 return 1;
 896
 897         return 0;
 898 }
 899
 900 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 901 {
 902         int nr_stdin, ret, err = -EINVAL;
 903         struct termios save;
 904
 905         /* live flag must be set first */
 906         kvm->live = true;
 907
 908         ret = cpu_isa_config(kvm);
 909         if (ret < 0)
 910                 return ret;
 911
 912         if (!verify_vcpu(kvm->trace_vcpu) ||
 913             !select_key(kvm) ||
 914             !register_kvm_events_ops(kvm)) {
 915                 goto out;
 916         }
 917
 918         set_term_quiet_input(&save);
 919         init_kvm_event_record(kvm);
 920
 921         signal(SIGINT, sig_handler);
 922         signal(SIGTERM, sig_handler);
 923
 924         /* add timer fd */
 925         if (perf_kvm__timerfd_create(kvm) < 0) {
 926                 err = -1;
 927                 goto out;
 928         }
 929
 930         if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
 931                 goto out;
 932
 933         nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
 934         if (nr_stdin < 0)
 935                 goto out;
 936
 937         if (fd_set_nonblock(fileno(stdin)) != 0)
 938                 goto out;
 939
 940         /* everything is good - enable the events and process */
 941         perf_evlist__enable(kvm->evlist);
 942
 943         while (!done) {
 944                 struct fdarray *fda = &kvm->evlist->pollfd;
 945                 int rc;
 946
 947                 rc = perf_kvm__mmap_read(kvm);
 948                 if (rc < 0)
 949                         break;
 950
 951                 err = perf_kvm__handle_timerfd(kvm);
 952                 if (err)
 953                         goto out;
 954
 955                 if (fda->entries[nr_stdin].revents & POLLIN)
 956                         done = perf_kvm__handle_stdin();
 957
 958                 if (!rc && !done)
 959                         err = fdarray__poll(fda, 100);
 960         }
 961
 962         perf_evlist__disable(kvm->evlist);
 963
 964         if (err == 0) {
 965                 sort_result(kvm);
 966                 print_result(kvm);
 967         }
 968
 969 out:
 970         if (kvm->timerfd >= 0)
 971                 close(kvm->timerfd);
 972
 973         tcsetattr(0, TCSAFLUSH, &save);
 974         return err;
 975 }
 976
 977 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
 978 {
 979         int err, rc = -1;
 980         struct perf_evsel *pos;
 981         struct perf_evlist *evlist = kvm->evlist;
 982         char sbuf[STRERR_BUFSIZE];
 983
 984         perf_evlist__config(evlist, &kvm->opts);
 985
 986         /*
 987          * Note: exclude_{guest,host} do not apply here.
 988          *       This command processes KVM tracepoints from host only
 989          */
 990         evlist__for_each(evlist, pos) {
 991                 struct perf_event_attr *attr = &pos->attr;
 992
 993                 /* make sure these *are* set */
 994                 perf_evsel__set_sample_bit(pos, TID);
 995                 perf_evsel__set_sample_bit(pos, TIME);
 996                 perf_evsel__set_sample_bit(pos, CPU);
 997                 perf_evsel__set_sample_bit(pos, RAW);
 998                 /* make sure these are *not*; want as small a sample as possible */
 999                 perf_evsel__reset_sample_bit(pos, PERIOD);
1000                 perf_evsel__reset_sample_bit(pos, IP);
1001                 perf_evsel__reset_sample_bit(pos, CALLCHAIN);
1002                 perf_evsel__reset_sample_bit(pos, ADDR);
1003                 perf_evsel__reset_sample_bit(pos, READ);
1004                 attr->mmap = 0;
1005                 attr->comm = 0;
1006                 attr->task = 0;
1007
1008                 attr->sample_period = 1;
1009
1010                 attr->watermark = 0;
1011                 attr->wakeup_events = 1000;
1012
1013                 /* will enable all once we are ready */
1014                 attr->disabled = 1;
1015         }
1016
1017         err = perf_evlist__open(evlist);
1018         if (err < 0) {
1019                 printf("Couldn't create the events: %s\n",
1020                        strerror_r(errno, sbuf, sizeof(sbuf)));
1021                 goto out;
1022         }
1023
1024         if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
1025                 ui__error("Failed to mmap the events: %s\n",
1026                           strerror_r(errno, sbuf, sizeof(sbuf)));
1027                 perf_evlist__close(evlist);
1028                 goto out;
1029         }
1030
1031         rc = 0;
1032
1033 out:
1034         return rc;
1035 }
1036 #endif
1037
1038 static int read_events(struct perf_kvm_stat *kvm)
1039 {
1040         int ret;
1041
1042         struct perf_tool eops = {
1043                 .sample                 = process_sample_event,
1044                 .comm                   = perf_event__process_comm,
1045                 .ordered_events         = true,
1046         };
1047         struct perf_data_file file = {
1048                 .path = kvm->file_name,
1049                 .mode = PERF_DATA_MODE_READ,
1050                 .force = kvm->force,
1051         };
1052
1053         kvm->tool = eops;
1054         kvm->session = perf_session__new(&file, false, &kvm->tool);
1055         if (!kvm->session) {
1056                 pr_err("Initializing perf session failed\n");
1057                 return -1;
1058         }
1059
1060         symbol__init(&kvm->session->header.env);
1061
1062         if (!perf_session__has_traces(kvm->session, "kvm record"))
1063                 return -EINVAL;
1064
1065         /*
1066          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1067          * traced in the old kernel.
1068          */
1069         ret = cpu_isa_config(kvm);
1070         if (ret < 0)
1071                 return ret;
1072
1073         return perf_session__process_events(kvm->session);
1074 }
1075
1076 static int parse_target_str(struct perf_kvm_stat *kvm)
1077 {
1078         if (kvm->opts.target.pid) {
1079                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1080                 if (kvm->pid_list == NULL) {
1081                         pr_err("Error parsing process id string\n");
1082                         return -EINVAL;
1083                 }
1084         }
1085
1086         return 0;
1087 }
1088
1089 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1090 {
1091         int ret = -EINVAL;
1092         int vcpu = kvm->trace_vcpu;
1093
1094         if (parse_target_str(kvm) != 0)
1095                 goto exit;
1096
1097         if (!verify_vcpu(vcpu))
1098                 goto exit;
1099
1100         if (!select_key(kvm))
1101                 goto exit;
1102
1103         if (!register_kvm_events_ops(kvm))
1104                 goto exit;
1105
1106         init_kvm_event_record(kvm);
1107         setup_pager();
1108
1109         ret = read_events(kvm);
1110         if (ret)
1111                 goto exit;
1112
1113         sort_result(kvm);
1114         print_result(kvm);
1115
1116 exit:
1117         return ret;
1118 }
1119
1120 #define STRDUP_FAIL_EXIT(s)             \
1121         ({      char *_p;               \
1122         _p = strdup(s);         \
1123                 if (!_p)                \
1124                         return -ENOMEM; \
1125                 _p;                     \
1126         })
1127
1128 static int
1129 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1130 {
1131         unsigned int rec_argc, i, j, events_tp_size;
1132         const char **rec_argv;
1133         const char * const record_args[] = {
1134                 "record",
1135                 "-R",
1136                 "-m", "1024",
1137                 "-c", "1",
1138         };
1139         const char * const kvm_stat_record_usage[] = {
1140                 "perf kvm stat record [<options>]",
1141                 NULL
1142         };
1143         const char * const *events_tp;
1144         events_tp_size = 0;
1145
1146         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1147                 events_tp_size++;
1148
1149         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1150                    2 * events_tp_size;
1151         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1152
1153         if (rec_argv == NULL)
1154                 return -ENOMEM;
1155
1156         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1157                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1158
1159         for (j = 0; j < events_tp_size; j++) {
1160                 rec_argv[i++] = "-e";
1161                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1162         }
1163
1164         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1165         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1166
1167         for (j = 1; j < (unsigned int)argc; j++, i++)
1168                 rec_argv[i] = argv[j];
1169
1170         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1171         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1172         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1173
1174         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1175         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1176         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1177         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1178         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1179         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1180         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1181         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1182         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1183         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1184         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1185         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1186         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1187         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1188         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1189
1190         record_usage = kvm_stat_record_usage;
1191         return cmd_record(i, rec_argv, NULL);
1192 }
1193
1194 static int
1195 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1196 {
1197         const struct option kvm_events_report_options[] = {
1198                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1199                            "event for reporting: vmexit, "
1200                            "mmio (x86 only), ioport (x86 only)"),
1201                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1202                             "vcpu id to report"),
1203                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1204                             "key for sorting: sample(sort by samples number)"
1205                             " time (sort by avg time)"),
1206                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1207                            "analyze events only for given process id(s)"),
1208                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1209                 OPT_END()
1210         };
1211
1212         const char * const kvm_events_report_usage[] = {
1213                 "perf kvm stat report [<options>]",
1214                 NULL
1215         };
1216
1217         if (argc) {
1218                 argc = parse_options(argc, argv,
1219                                      kvm_events_report_options,
1220                                      kvm_events_report_usage, 0);
1221                 if (argc)
1222                         usage_with_options(kvm_events_report_usage,
1223                                            kvm_events_report_options);
1224         }
1225
1226         if (!kvm->opts.target.pid)
1227                 kvm->opts.target.system_wide = true;
1228
1229         return kvm_events_report_vcpu(kvm);
1230 }
1231
1232 #ifdef HAVE_TIMERFD_SUPPORT
1233 static struct perf_evlist *kvm_live_event_list(void)
1234 {
1235         struct perf_evlist *evlist;
1236         char *tp, *name, *sys;
1237         int err = -1;
1238         const char * const *events_tp;
1239
1240         evlist = perf_evlist__new();
1241         if (evlist == NULL)
1242                 return NULL;
1243
1244         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1245
1246                 tp = strdup(*events_tp);
1247                 if (tp == NULL)
1248                         goto out;
1249
1250                 /* split tracepoint into subsystem and name */
1251                 sys = tp;
1252                 name = strchr(tp, ':');
1253                 if (name == NULL) {
1254                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1255                                *events_tp);
1256                         free(tp);
1257                         goto out;
1258                 }
1259                 *name = '\0';
1260                 name++;
1261
1262                 if (perf_evlist__add_newtp(evlist, sys, name, NULL)) {
1263                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1264                         free(tp);
1265                         goto out;
1266                 }
1267
1268                 free(tp);
1269         }
1270
1271         err = 0;
1272
1273 out:
1274         if (err) {
1275                 perf_evlist__delete(evlist);
1276                 evlist = NULL;
1277         }
1278
1279         return evlist;
1280 }
1281
1282 static int kvm_events_live(struct perf_kvm_stat *kvm,
1283                            int argc, const char **argv)
1284 {
1285         char errbuf[BUFSIZ];
1286         int err;
1287
1288         const struct option live_options[] = {
1289                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1290                         "record events on existing process id"),
1291                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1292                         "number of mmap data pages",
1293                         perf_evlist__parse_mmap_pages),
1294                 OPT_INCR('v', "verbose", &verbose,
1295                         "be more verbose (show counter open errors, etc)"),
1296                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1297                         "system-wide collection from all CPUs"),
1298                 OPT_UINTEGER('d', "display", &kvm->display_time,
1299                         "time in seconds between display updates"),
1300                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1301                         "event for reporting: "
1302                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1303                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1304                         "vcpu id to report"),
1305                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1306                         "key for sorting: sample(sort by samples number)"
1307                         " time (sort by avg time)"),
1308                 OPT_U64(0, "duration", &kvm->duration,
1309                         "show events other than"
1310                         " HLT (x86 only) or Wait state (s390 only)"
1311                         " that take longer than duration usecs"),
1312                 OPT_END()
1313         };
1314         const char * const live_usage[] = {
1315                 "perf kvm stat live [<options>]",
1316                 NULL
1317         };
1318         struct perf_data_file file = {
1319                 .mode = PERF_DATA_MODE_WRITE,
1320         };
1321
1322
1323         /* event handling */
1324         kvm->tool.sample = process_sample_event;
1325         kvm->tool.comm   = perf_event__process_comm;
1326         kvm->tool.exit   = perf_event__process_exit;
1327         kvm->tool.fork   = perf_event__process_fork;
1328         kvm->tool.lost   = process_lost_event;
1329         kvm->tool.ordered_events = true;
1330         perf_tool__fill_defaults(&kvm->tool);
1331
1332         /* set defaults */
1333         kvm->display_time = 1;
1334         kvm->opts.user_interval = 1;
1335         kvm->opts.mmap_pages = 512;
1336         kvm->opts.target.uses_mmap = false;
1337         kvm->opts.target.uid_str = NULL;
1338         kvm->opts.target.uid = UINT_MAX;
1339
1340         symbol__init(NULL);
1341         disable_buildid_cache();
1342
1343         use_browser = 0;
1344         setup_browser(false);
1345
1346         if (argc) {
1347                 argc = parse_options(argc, argv, live_options,
1348                                      live_usage, 0);
1349                 if (argc)
1350                         usage_with_options(live_usage, live_options);
1351         }
1352
1353         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1354
1355         /*
1356          * target related setups
1357          */
1358         err = target__validate(&kvm->opts.target);
1359         if (err) {
1360                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1361                 ui__warning("%s", errbuf);
1362         }
1363
1364         if (target__none(&kvm->opts.target))
1365                 kvm->opts.target.system_wide = true;
1366
1367
1368         /*
1369          * generate the event list
1370          */
1371         kvm->evlist = kvm_live_event_list();
1372         if (kvm->evlist == NULL) {
1373                 err = -1;
1374                 goto out;
1375         }
1376
1377         symbol_conf.nr_events = kvm->evlist->nr_entries;
1378
1379         if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1380                 usage_with_options(live_usage, live_options);
1381
1382         /*
1383          * perf session
1384          */
1385         kvm->session = perf_session__new(&file, false, &kvm->tool);
1386         if (kvm->session == NULL) {
1387                 err = -1;
1388                 goto out;
1389         }
1390         kvm->session->evlist = kvm->evlist;
1391         perf_session__set_id_hdr_size(kvm->session);
1392         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1393         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1394                                     kvm->evlist->threads, false);
1395         err = kvm_live_open_events(kvm);
1396         if (err)
1397                 goto out;
1398
1399         err = kvm_events_live_report(kvm);
1400
1401 out:
1402         exit_browser(0);
1403
1404         if (kvm->session)
1405                 perf_session__delete(kvm->session);
1406         kvm->session = NULL;
1407         if (kvm->evlist)
1408                 perf_evlist__delete(kvm->evlist);
1409
1410         return err;
1411 }
1412 #endif
1413
1414 static void print_kvm_stat_usage(void)
1415 {
1416         printf("Usage: perf kvm stat <command>\n\n");
1417
1418         printf("# Available commands:\n");
1419         printf("\trecord: record kvm events\n");
1420         printf("\treport: report statistical data of kvm events\n");
1421         printf("\tlive:   live reporting of statistical data of kvm events\n");
1422
1423         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1424 }
1425
1426 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1427 {
1428         struct perf_kvm_stat kvm = {
1429                 .file_name = file_name,
1430
1431                 .trace_vcpu     = -1,
1432                 .report_event   = "vmexit",
1433                 .sort_key       = "sample",
1434
1435         };
1436
1437         if (argc == 1) {
1438                 print_kvm_stat_usage();
1439                 goto perf_stat;
1440         }
1441
1442         if (!strncmp(argv[1], "rec", 3))
1443                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1444
1445         if (!strncmp(argv[1], "rep", 3))
1446                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1447
1448 #ifdef HAVE_TIMERFD_SUPPORT
1449         if (!strncmp(argv[1], "live", 4))
1450                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1451 #endif
1452
1453 perf_stat:
1454         return cmd_stat(argc, argv, NULL);
1455 }
1456 #endif /* HAVE_KVM_STAT_SUPPORT */
1457
1458 static int __cmd_record(const char *file_name, int argc, const char **argv)
1459 {
1460         int rec_argc, i = 0, j;
1461         const char **rec_argv;
1462
1463         rec_argc = argc + 2;
1464         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1465         rec_argv[i++] = strdup("record");
1466         rec_argv[i++] = strdup("-o");
1467         rec_argv[i++] = strdup(file_name);
1468         for (j = 1; j < argc; j++, i++)
1469                 rec_argv[i] = argv[j];
1470
1471         BUG_ON(i != rec_argc);
1472
1473         return cmd_record(i, rec_argv, NULL);
1474 }
1475
1476 static int __cmd_report(const char *file_name, int argc, const char **argv)
1477 {
1478         int rec_argc, i = 0, j;
1479         const char **rec_argv;
1480
1481         rec_argc = argc + 2;
1482         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1483         rec_argv[i++] = strdup("report");
1484         rec_argv[i++] = strdup("-i");
1485         rec_argv[i++] = strdup(file_name);
1486         for (j = 1; j < argc; j++, i++)
1487                 rec_argv[i] = argv[j];
1488
1489         BUG_ON(i != rec_argc);
1490
1491         return cmd_report(i, rec_argv, NULL);
1492 }
1493
1494 static int
1495 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1496 {
1497         int rec_argc, i = 0, j;
1498         const char **rec_argv;
1499
1500         rec_argc = argc + 2;
1501         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1502         rec_argv[i++] = strdup("buildid-list");
1503         rec_argv[i++] = strdup("-i");
1504         rec_argv[i++] = strdup(file_name);
1505         for (j = 1; j < argc; j++, i++)
1506                 rec_argv[i] = argv[j];
1507
1508         BUG_ON(i != rec_argc);
1509
1510         return cmd_buildid_list(i, rec_argv, NULL);
1511 }
1512
1513 int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
1514 {
1515         const char *file_name = NULL;
1516         const struct option kvm_options[] = {
1517                 OPT_STRING('i', "input", &file_name, "file",
1518                            "Input file name"),
1519                 OPT_STRING('o', "output", &file_name, "file",
1520                            "Output file name"),
1521                 OPT_BOOLEAN(0, "guest", &perf_guest,
1522                             "Collect guest os data"),
1523                 OPT_BOOLEAN(0, "host", &perf_host,
1524                             "Collect host os data"),
1525                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1526                            "guest mount directory under which every guest os"
1527                            " instance has a subdir"),
1528                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1529                            "file", "file saving guest os vmlinux"),
1530                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1531                            "file", "file saving guest os /proc/kallsyms"),
1532                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1533                            "file", "file saving guest os /proc/modules"),
1534                 OPT_INCR('v', "verbose", &verbose,
1535                             "be more verbose (show counter open errors, etc)"),
1536                 OPT_END()
1537         };
1538
1539         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1540                                                 "buildid-list", "stat", NULL };
1541         const char *kvm_usage[] = { NULL, NULL };
1542
1543         perf_host  = 0;
1544         perf_guest = 1;
1545
1546         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1547                                         PARSE_OPT_STOP_AT_NON_OPTION);
1548         if (!argc)
1549                 usage_with_options(kvm_usage, kvm_options);
1550
1551         if (!perf_host)
1552                 perf_guest = 1;
1553
1554         if (!file_name) {
1555                 file_name = get_filename_for_perf_kvm();
1556
1557                 if (!file_name) {
1558                         pr_err("Failed to allocate memory for filename\n");
1559                         return -ENOMEM;
1560                 }
1561         }
1562
1563         if (!strncmp(argv[0], "rec", 3))
1564                 return __cmd_record(file_name, argc, argv);
1565         else if (!strncmp(argv[0], "rep", 3))
1566                 return __cmd_report(file_name, argc, argv);
1567         else if (!strncmp(argv[0], "diff", 4))
1568                 return cmd_diff(argc, argv, NULL);
1569         else if (!strncmp(argv[0], "top", 3))
1570                 return cmd_top(argc, argv, NULL);
1571         else if (!strncmp(argv[0], "buildid-list", 12))
1572                 return __cmd_buildid_list(file_name, argc, argv);
1573 #ifdef HAVE_KVM_STAT_SUPPORT
1574         else if (!strncmp(argv[0], "stat", 4))
1575                 return kvm_cmd_stat(file_name, argc, argv);
1576 #endif
1577         else
1578                 usage_with_options(kvm_usage, kvm_options);
1579
1580         return 0;
1581 }