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