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 <subcmd/parse-options.h>
  14 #include "util/trace-event.h"
  15 #include "util/debug.h"
  16 #include "util/tool.h"
  17 #include "util/stat.h"
  18 #include "util/top.h"
  19 #include "util/data.h"
  20 #include "util/ordered-events.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 "util/kvm-stat.h"
  34
  35 void exit_event_get_key(struct perf_evsel *evsel,
  36                         struct perf_sample *sample,
  37                         struct event_key *key)
  38 {
  39         key->info = 0;
  40         key->key = perf_evsel__intval(evsel, sample, kvm_exit_reason);
  41 }
  42
  43 bool kvm_exit_event(struct perf_evsel *evsel)
  44 {
  45         return !strcmp(evsel->name, kvm_exit_trace);
  46 }
  47
  48 bool exit_event_begin(struct perf_evsel *evsel,
  49                       struct perf_sample *sample, struct event_key *key)
  50 {
  51         if (kvm_exit_event(evsel)) {
  52                 exit_event_get_key(evsel, sample, key);
  53                 return true;
  54         }
  55
  56         return false;
  57 }
  58
  59 bool kvm_entry_event(struct perf_evsel *evsel)
  60 {
  61         return !strcmp(evsel->name, kvm_entry_trace);
  62 }
  63
  64 bool exit_event_end(struct perf_evsel *evsel,
  65                     struct perf_sample *sample __maybe_unused,
  66                     struct event_key *key __maybe_unused)
  67 {
  68         return kvm_entry_event(evsel);
  69 }
  70
  71 static const char *get_exit_reason(struct perf_kvm_stat *kvm,
  72                                    struct exit_reasons_table *tbl,
  73                                    u64 exit_code)
  74 {
  75         while (tbl->reason != NULL) {
  76                 if (tbl->exit_code == exit_code)
  77                         return tbl->reason;
  78                 tbl++;
  79         }
  80
  81         pr_err("unknown kvm exit code:%lld on %s\n",
  82                 (unsigned long long)exit_code, kvm->exit_reasons_isa);
  83         return "UNKNOWN";
  84 }
  85
  86 void exit_event_decode_key(struct perf_kvm_stat *kvm,
  87                            struct event_key *key,
  88                            char *decode)
  89 {
  90         const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
  91                                                   key->key);
  92
  93         scnprintf(decode, decode_str_len, "%s", exit_reason);
  94 }
  95
  96 static bool register_kvm_events_ops(struct perf_kvm_stat *kvm)
  97 {
  98         struct kvm_reg_events_ops *events_ops = kvm_reg_events_ops;
  99
 100         for (events_ops = kvm_reg_events_ops; events_ops->name; events_ops++) {
 101                 if (!strcmp(events_ops->name, kvm->report_event)) {
 102                         kvm->events_ops = events_ops->ops;
 103                         return true;
 104                 }
 105         }
 106
 107         return false;
 108 }
 109
 110 struct vcpu_event_record {
 111         int vcpu_id;
 112         u64 start_time;
 113         struct kvm_event *last_event;
 114 };
 115
 116
 117 static void init_kvm_event_record(struct perf_kvm_stat *kvm)
 118 {
 119         unsigned int i;
 120
 121         for (i = 0; i < EVENTS_CACHE_SIZE; i++)
 122                 INIT_LIST_HEAD(&kvm->kvm_events_cache[i]);
 123 }
 124
 125 #ifdef HAVE_TIMERFD_SUPPORT
 126 static void clear_events_cache_stats(struct list_head *kvm_events_cache)
 127 {
 128         struct list_head *head;
 129         struct kvm_event *event;
 130         unsigned int i;
 131         int j;
 132
 133         for (i = 0; i < EVENTS_CACHE_SIZE; i++) {
 134                 head = &kvm_events_cache[i];
 135                 list_for_each_entry(event, head, hash_entry) {
 136                         /* reset stats for event */
 137                         event->total.time = 0;
 138                         init_stats(&event->total.stats);
 139
 140                         for (j = 0; j < event->max_vcpu; ++j) {
 141                                 event->vcpu[j].time = 0;
 142                                 init_stats(&event->vcpu[j].stats);
 143                         }
 144                 }
 145         }
 146 }
 147 #endif
 148
 149 static int kvm_events_hash_fn(u64 key)
 150 {
 151         return key & (EVENTS_CACHE_SIZE - 1);
 152 }
 153
 154 static bool kvm_event_expand(struct kvm_event *event, int vcpu_id)
 155 {
 156         int old_max_vcpu = event->max_vcpu;
 157         void *prev;
 158
 159         if (vcpu_id < event->max_vcpu)
 160                 return true;
 161
 162         while (event->max_vcpu <= vcpu_id)
 163                 event->max_vcpu += DEFAULT_VCPU_NUM;
 164
 165         prev = event->vcpu;
 166         event->vcpu = realloc(event->vcpu,
 167                               event->max_vcpu * sizeof(*event->vcpu));
 168         if (!event->vcpu) {
 169                 free(prev);
 170                 pr_err("Not enough memory\n");
 171                 return false;
 172         }
 173
 174         memset(event->vcpu + old_max_vcpu, 0,
 175                (event->max_vcpu - old_max_vcpu) * sizeof(*event->vcpu));
 176         return true;
 177 }
 178
 179 static struct kvm_event *kvm_alloc_init_event(struct event_key *key)
 180 {
 181         struct kvm_event *event;
 182
 183         event = zalloc(sizeof(*event));
 184         if (!event) {
 185                 pr_err("Not enough memory\n");
 186                 return NULL;
 187         }
 188
 189         event->key = *key;
 190         init_stats(&event->total.stats);
 191         return event;
 192 }
 193
 194 static struct kvm_event *find_create_kvm_event(struct perf_kvm_stat *kvm,
 195                                                struct event_key *key)
 196 {
 197         struct kvm_event *event;
 198         struct list_head *head;
 199
 200         BUG_ON(key->key == INVALID_KEY);
 201
 202         head = &kvm->kvm_events_cache[kvm_events_hash_fn(key->key)];
 203         list_for_each_entry(event, head, hash_entry) {
 204                 if (event->key.key == key->key && event->key.info == key->info)
 205                         return event;
 206         }
 207
 208         event = kvm_alloc_init_event(key);
 209         if (!event)
 210                 return NULL;
 211
 212         list_add(&event->hash_entry, head);
 213         return event;
 214 }
 215
 216 static bool handle_begin_event(struct perf_kvm_stat *kvm,
 217                                struct vcpu_event_record *vcpu_record,
 218                                struct event_key *key, u64 timestamp)
 219 {
 220         struct kvm_event *event = NULL;
 221
 222         if (key->key != INVALID_KEY)
 223                 event = find_create_kvm_event(kvm, key);
 224
 225         vcpu_record->last_event = event;
 226         vcpu_record->start_time = timestamp;
 227         return true;
 228 }
 229
 230 static void
 231 kvm_update_event_stats(struct kvm_event_stats *kvm_stats, u64 time_diff)
 232 {
 233         kvm_stats->time += time_diff;
 234         update_stats(&kvm_stats->stats, time_diff);
 235 }
 236
 237 static double kvm_event_rel_stddev(int vcpu_id, struct kvm_event *event)
 238 {
 239         struct kvm_event_stats *kvm_stats = &event->total;
 240
 241         if (vcpu_id != -1)
 242                 kvm_stats = &event->vcpu[vcpu_id];
 243
 244         return rel_stddev_stats(stddev_stats(&kvm_stats->stats),
 245                                 avg_stats(&kvm_stats->stats));
 246 }
 247
 248 static bool update_kvm_event(struct kvm_event *event, int vcpu_id,
 249                              u64 time_diff)
 250 {
 251         if (vcpu_id == -1) {
 252                 kvm_update_event_stats(&event->total, time_diff);
 253                 return true;
 254         }
 255
 256         if (!kvm_event_expand(event, vcpu_id))
 257                 return false;
 258
 259         kvm_update_event_stats(&event->vcpu[vcpu_id], time_diff);
 260         return true;
 261 }
 262
 263 static bool is_child_event(struct perf_kvm_stat *kvm,
 264                            struct perf_evsel *evsel,
 265                            struct perf_sample *sample,
 266                            struct event_key *key)
 267 {
 268         struct child_event_ops *child_ops;
 269
 270         child_ops = kvm->events_ops->child_ops;
 271
 272         if (!child_ops)
 273                 return false;
 274
 275         for (; child_ops->name; child_ops++) {
 276                 if (!strcmp(evsel->name, child_ops->name)) {
 277                         child_ops->get_key(evsel, sample, key);
 278                         return true;
 279                 }
 280         }
 281
 282         return false;
 283 }
 284
 285 static bool handle_child_event(struct perf_kvm_stat *kvm,
 286                                struct vcpu_event_record *vcpu_record,
 287                                struct event_key *key,
 288                                struct perf_sample *sample __maybe_unused)
 289 {
 290         struct kvm_event *event = NULL;
 291
 292         if (key->key != INVALID_KEY)
 293                 event = find_create_kvm_event(kvm, key);
 294
 295         vcpu_record->last_event = event;
 296
 297         return true;
 298 }
 299
 300 static bool skip_event(const char *event)
 301 {
 302         const char * const *skip_events;
 303
 304         for (skip_events = kvm_skip_events; *skip_events; skip_events++)
 305                 if (!strcmp(event, *skip_events))
 306                         return true;
 307
 308         return false;
 309 }
 310
 311 static bool handle_end_event(struct perf_kvm_stat *kvm,
 312                              struct vcpu_event_record *vcpu_record,
 313                              struct event_key *key,
 314                              struct perf_sample *sample)
 315 {
 316         struct kvm_event *event;
 317         u64 time_begin, time_diff;
 318         int vcpu;
 319
 320         if (kvm->trace_vcpu == -1)
 321                 vcpu = -1;
 322         else
 323                 vcpu = vcpu_record->vcpu_id;
 324
 325         event = vcpu_record->last_event;
 326         time_begin = vcpu_record->start_time;
 327
 328         /* The begin event is not caught. */
 329         if (!time_begin)
 330                 return true;
 331
 332         /*
 333          * In some case, the 'begin event' only records the start timestamp,
 334          * the actual event is recognized in the 'end event' (e.g. mmio-event).
 335          */
 336
 337         /* Both begin and end events did not get the key. */
 338         if (!event && key->key == INVALID_KEY)
 339                 return true;
 340
 341         if (!event)
 342                 event = find_create_kvm_event(kvm, key);
 343
 344         if (!event)
 345                 return false;
 346
 347         vcpu_record->last_event = NULL;
 348         vcpu_record->start_time = 0;
 349
 350         /* seems to happen once in a while during live mode */
 351         if (sample->time < time_begin) {
 352                 pr_debug("End time before begin time; skipping event.\n");
 353                 return true;
 354         }
 355
 356         time_diff = sample->time - time_begin;
 357
 358         if (kvm->duration && time_diff > kvm->duration) {
 359                 char decode[decode_str_len];
 360
 361                 kvm->events_ops->decode_key(kvm, &event->key, decode);
 362                 if (!skip_event(decode)) {
 363                         pr_info("%" PRIu64 " VM %d, vcpu %d: %s event took %" PRIu64 "usec\n",
 364                                  sample->time, sample->pid, vcpu_record->vcpu_id,
 365                                  decode, time_diff/1000);
 366                 }
 367         }
 368
 369         return update_kvm_event(event, vcpu, time_diff);
 370 }
 371
 372 static
 373 struct vcpu_event_record *per_vcpu_record(struct thread *thread,
 374                                           struct perf_evsel *evsel,
 375                                           struct perf_sample *sample)
 376 {
 377         /* Only kvm_entry records vcpu id. */
 378         if (!thread__priv(thread) && kvm_entry_event(evsel)) {
 379                 struct vcpu_event_record *vcpu_record;
 380
 381                 vcpu_record = zalloc(sizeof(*vcpu_record));
 382                 if (!vcpu_record) {
 383                         pr_err("%s: Not enough memory\n", __func__);
 384                         return NULL;
 385                 }
 386
 387                 vcpu_record->vcpu_id = perf_evsel__intval(evsel, sample,
 388                                                           vcpu_id_str);
 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         int err = 0;
 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                 err = -1;
 670
 671         thread__put(thread);
 672         return err;
 673 }
 674
 675 static int cpu_isa_config(struct perf_kvm_stat *kvm)
 676 {
 677         char buf[64], *cpuid;
 678         int err;
 679
 680         if (kvm->live) {
 681                 err = get_cpuid(buf, sizeof(buf));
 682                 if (err != 0) {
 683                         pr_err("Failed to look up CPU type\n");
 684                         return err;
 685                 }
 686                 cpuid = buf;
 687         } else
 688                 cpuid = kvm->session->header.env.cpuid;
 689
 690         if (!cpuid) {
 691                 pr_err("Failed to look up CPU type\n");
 692                 return -EINVAL;
 693         }
 694
 695         err = cpu_isa_init(kvm, cpuid);
 696         if (err == -ENOTSUP)
 697                 pr_err("CPU %s is not supported.\n", cpuid);
 698
 699         return err;
 700 }
 701
 702 static bool verify_vcpu(int vcpu)
 703 {
 704         if (vcpu != -1 && vcpu < 0) {
 705                 pr_err("Invalid vcpu:%d.\n", vcpu);
 706                 return false;
 707         }
 708
 709         return true;
 710 }
 711
 712 #ifdef HAVE_TIMERFD_SUPPORT
 713 /* keeping the max events to a modest level to keep
 714  * the processing of samples per mmap smooth.
 715  */
 716 #define PERF_KVM__MAX_EVENTS_PER_MMAP  25
 717
 718 static s64 perf_kvm__mmap_read_idx(struct perf_kvm_stat *kvm, int idx,
 719                                    u64 *mmap_time)
 720 {
 721         union perf_event *event;
 722         struct perf_sample sample;
 723         s64 n = 0;
 724         int err;
 725
 726         *mmap_time = ULLONG_MAX;
 727         while ((event = perf_evlist__mmap_read(kvm->evlist, idx)) != NULL) {
 728                 err = perf_evlist__parse_sample(kvm->evlist, event, &sample);
 729                 if (err) {
 730                         perf_evlist__mmap_consume(kvm->evlist, idx);
 731                         pr_err("Failed to parse sample\n");
 732                         return -1;
 733                 }
 734
 735                 err = perf_session__queue_event(kvm->session, event, &sample, 0);
 736                 /*
 737                  * FIXME: Here we can't consume the event, as perf_session__queue_event will
 738                  *        point to it, and it'll get possibly overwritten by the kernel.
 739                  */
 740                 perf_evlist__mmap_consume(kvm->evlist, idx);
 741
 742                 if (err) {
 743                         pr_err("Failed to enqueue sample: %d\n", err);
 744                         return -1;
 745                 }
 746
 747                 /* save time stamp of our first sample for this mmap */
 748                 if (n == 0)
 749                         *mmap_time = sample.time;
 750
 751                 /* limit events per mmap handled all at once */
 752                 n++;
 753                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 754                         break;
 755         }
 756
 757         return n;
 758 }
 759
 760 static int perf_kvm__mmap_read(struct perf_kvm_stat *kvm)
 761 {
 762         int i, err, throttled = 0;
 763         s64 n, ntotal = 0;
 764         u64 flush_time = ULLONG_MAX, mmap_time;
 765
 766         for (i = 0; i < kvm->evlist->nr_mmaps; i++) {
 767                 n = perf_kvm__mmap_read_idx(kvm, i, &mmap_time);
 768                 if (n < 0)
 769                         return -1;
 770
 771                 /* flush time is going to be the minimum of all the individual
 772                  * mmap times. Essentially, we flush all the samples queued up
 773                  * from the last pass under our minimal start time -- that leaves
 774                  * a very small race for samples to come in with a lower timestamp.
 775                  * The ioctl to return the perf_clock timestamp should close the
 776                  * race entirely.
 777                  */
 778                 if (mmap_time < flush_time)
 779                         flush_time = mmap_time;
 780
 781                 ntotal += n;
 782                 if (n == PERF_KVM__MAX_EVENTS_PER_MMAP)
 783                         throttled = 1;
 784         }
 785
 786         /* flush queue after each round in which we processed events */
 787         if (ntotal) {
 788                 struct ordered_events *oe = &kvm->session->ordered_events;
 789
 790                 oe->next_flush = flush_time;
 791                 err = ordered_events__flush(oe, OE_FLUSH__ROUND);
 792                 if (err) {
 793                         if (kvm->lost_events)
 794                                 pr_info("\nLost events: %" PRIu64 "\n\n",
 795                                         kvm->lost_events);
 796                         return err;
 797                 }
 798         }
 799
 800         return throttled;
 801 }
 802
 803 static volatile int done;
 804
 805 static void sig_handler(int sig __maybe_unused)
 806 {
 807         done = 1;
 808 }
 809
 810 static int perf_kvm__timerfd_create(struct perf_kvm_stat *kvm)
 811 {
 812         struct itimerspec new_value;
 813         int rc = -1;
 814
 815         kvm->timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK);
 816         if (kvm->timerfd < 0) {
 817                 pr_err("timerfd_create failed\n");
 818                 goto out;
 819         }
 820
 821         new_value.it_value.tv_sec = kvm->display_time;
 822         new_value.it_value.tv_nsec = 0;
 823         new_value.it_interval.tv_sec = kvm->display_time;
 824         new_value.it_interval.tv_nsec = 0;
 825
 826         if (timerfd_settime(kvm->timerfd, 0, &new_value, NULL) != 0) {
 827                 pr_err("timerfd_settime failed: %d\n", errno);
 828                 close(kvm->timerfd);
 829                 goto out;
 830         }
 831
 832         rc = 0;
 833 out:
 834         return rc;
 835 }
 836
 837 static int perf_kvm__handle_timerfd(struct perf_kvm_stat *kvm)
 838 {
 839         uint64_t c;
 840         int rc;
 841
 842         rc = read(kvm->timerfd, &c, sizeof(uint64_t));
 843         if (rc < 0) {
 844                 if (errno == EAGAIN)
 845                         return 0;
 846
 847                 pr_err("Failed to read timer fd: %d\n", errno);
 848                 return -1;
 849         }
 850
 851         if (rc != sizeof(uint64_t)) {
 852                 pr_err("Error reading timer fd - invalid size returned\n");
 853                 return -1;
 854         }
 855
 856         if (c != 1)
 857                 pr_debug("Missed timer beats: %" PRIu64 "\n", c-1);
 858
 859         /* update display */
 860         sort_result(kvm);
 861         print_result(kvm);
 862
 863         /* reset counts */
 864         clear_events_cache_stats(kvm->kvm_events_cache);
 865         kvm->total_count = 0;
 866         kvm->total_time = 0;
 867         kvm->lost_events = 0;
 868
 869         return 0;
 870 }
 871
 872 static int fd_set_nonblock(int fd)
 873 {
 874         long arg = 0;
 875
 876         arg = fcntl(fd, F_GETFL);
 877         if (arg < 0) {
 878                 pr_err("Failed to get current flags for fd %d\n", fd);
 879                 return -1;
 880         }
 881
 882         if (fcntl(fd, F_SETFL, arg | O_NONBLOCK) < 0) {
 883                 pr_err("Failed to set non-block option on fd %d\n", fd);
 884                 return -1;
 885         }
 886
 887         return 0;
 888 }
 889
 890 static int perf_kvm__handle_stdin(void)
 891 {
 892         int c;
 893
 894         c = getc(stdin);
 895         if (c == 'q')
 896                 return 1;
 897
 898         return 0;
 899 }
 900
 901 static int kvm_events_live_report(struct perf_kvm_stat *kvm)
 902 {
 903         int nr_stdin, ret, err = -EINVAL;
 904         struct termios save;
 905
 906         /* live flag must be set first */
 907         kvm->live = true;
 908
 909         ret = cpu_isa_config(kvm);
 910         if (ret < 0)
 911                 return ret;
 912
 913         if (!verify_vcpu(kvm->trace_vcpu) ||
 914             !select_key(kvm) ||
 915             !register_kvm_events_ops(kvm)) {
 916                 goto out;
 917         }
 918
 919         set_term_quiet_input(&save);
 920         init_kvm_event_record(kvm);
 921
 922         signal(SIGINT, sig_handler);
 923         signal(SIGTERM, sig_handler);
 924
 925         /* add timer fd */
 926         if (perf_kvm__timerfd_create(kvm) < 0) {
 927                 err = -1;
 928                 goto out;
 929         }
 930
 931         if (perf_evlist__add_pollfd(kvm->evlist, kvm->timerfd) < 0)
 932                 goto out;
 933
 934         nr_stdin = perf_evlist__add_pollfd(kvm->evlist, fileno(stdin));
 935         if (nr_stdin < 0)
 936                 goto out;
 937
 938         if (fd_set_nonblock(fileno(stdin)) != 0)
 939                 goto out;
 940
 941         /* everything is good - enable the events and process */
 942         perf_evlist__enable(kvm->evlist);
 943
 944         while (!done) {
 945                 struct fdarray *fda = &kvm->evlist->pollfd;
 946                 int rc;
 947
 948                 rc = perf_kvm__mmap_read(kvm);
 949                 if (rc < 0)
 950                         break;
 951
 952                 err = perf_kvm__handle_timerfd(kvm);
 953                 if (err)
 954                         goto out;
 955
 956                 if (fda->entries[nr_stdin].revents & POLLIN)
 957                         done = perf_kvm__handle_stdin();
 958
 959                 if (!rc && !done)
 960                         err = fdarray__poll(fda, 100);
 961         }
 962
 963         perf_evlist__disable(kvm->evlist);
 964
 965         if (err == 0) {
 966                 sort_result(kvm);
 967                 print_result(kvm);
 968         }
 969
 970 out:
 971         if (kvm->timerfd >= 0)
 972                 close(kvm->timerfd);
 973
 974         tcsetattr(0, TCSAFLUSH, &save);
 975         return err;
 976 }
 977
 978 static int kvm_live_open_events(struct perf_kvm_stat *kvm)
 979 {
 980         int err, rc = -1;
 981         struct perf_evsel *pos;
 982         struct perf_evlist *evlist = kvm->evlist;
 983         char sbuf[STRERR_BUFSIZE];
 984
 985         perf_evlist__config(evlist, &kvm->opts, NULL);
 986
 987         /*
 988          * Note: exclude_{guest,host} do not apply here.
 989          *       This command processes KVM tracepoints from host only
 990          */
 991         evlist__for_each_entry(evlist, pos) {
 992                 struct perf_event_attr *attr = &pos->attr;
 993
 994                 /* make sure these *are* set */
 995                 perf_evsel__set_sample_bit(pos, TID);
 996                 perf_evsel__set_sample_bit(pos, TIME);
 997                 perf_evsel__set_sample_bit(pos, CPU);
 998                 perf_evsel__set_sample_bit(pos, RAW);
 999                 /* make sure these are *not*; want as small a sample as possible */
1000                 perf_evsel__reset_sample_bit(pos, PERIOD);
1001                 perf_evsel__reset_sample_bit(pos, IP);
1002                 perf_evsel__reset_sample_bit(pos, CALLCHAIN);
1003                 perf_evsel__reset_sample_bit(pos, ADDR);
1004                 perf_evsel__reset_sample_bit(pos, READ);
1005                 attr->mmap = 0;
1006                 attr->comm = 0;
1007                 attr->task = 0;
1008
1009                 attr->sample_period = 1;
1010
1011                 attr->watermark = 0;
1012                 attr->wakeup_events = 1000;
1013
1014                 /* will enable all once we are ready */
1015                 attr->disabled = 1;
1016         }
1017
1018         err = perf_evlist__open(evlist);
1019         if (err < 0) {
1020                 printf("Couldn't create the events: %s\n",
1021                        str_error_r(errno, sbuf, sizeof(sbuf)));
1022                 goto out;
1023         }
1024
1025         if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
1026                 ui__error("Failed to mmap the events: %s\n",
1027                           str_error_r(errno, sbuf, sizeof(sbuf)));
1028                 perf_evlist__close(evlist);
1029                 goto out;
1030         }
1031
1032         rc = 0;
1033
1034 out:
1035         return rc;
1036 }
1037 #endif
1038
1039 static int read_events(struct perf_kvm_stat *kvm)
1040 {
1041         int ret;
1042
1043         struct perf_tool eops = {
1044                 .sample                 = process_sample_event,
1045                 .comm                   = perf_event__process_comm,
1046                 .ordered_events         = true,
1047         };
1048         struct perf_data_file file = {
1049                 .path = kvm->file_name,
1050                 .mode = PERF_DATA_MODE_READ,
1051                 .force = kvm->force,
1052         };
1053
1054         kvm->tool = eops;
1055         kvm->session = perf_session__new(&file, false, &kvm->tool);
1056         if (!kvm->session) {
1057                 pr_err("Initializing perf session failed\n");
1058                 return -1;
1059         }
1060
1061         symbol__init(&kvm->session->header.env);
1062
1063         if (!perf_session__has_traces(kvm->session, "kvm record")) {
1064                 ret = -EINVAL;
1065                 goto out_delete;
1066         }
1067
1068         /*
1069          * Do not use 'isa' recorded in kvm_exit tracepoint since it is not
1070          * traced in the old kernel.
1071          */
1072         ret = cpu_isa_config(kvm);
1073         if (ret < 0)
1074                 goto out_delete;
1075
1076         ret = perf_session__process_events(kvm->session);
1077
1078 out_delete:
1079         perf_session__delete(kvm->session);
1080         return ret;
1081 }
1082
1083 static int parse_target_str(struct perf_kvm_stat *kvm)
1084 {
1085         if (kvm->opts.target.pid) {
1086                 kvm->pid_list = intlist__new(kvm->opts.target.pid);
1087                 if (kvm->pid_list == NULL) {
1088                         pr_err("Error parsing process id string\n");
1089                         return -EINVAL;
1090                 }
1091         }
1092
1093         return 0;
1094 }
1095
1096 static int kvm_events_report_vcpu(struct perf_kvm_stat *kvm)
1097 {
1098         int ret = -EINVAL;
1099         int vcpu = kvm->trace_vcpu;
1100
1101         if (parse_target_str(kvm) != 0)
1102                 goto exit;
1103
1104         if (!verify_vcpu(vcpu))
1105                 goto exit;
1106
1107         if (!select_key(kvm))
1108                 goto exit;
1109
1110         if (!register_kvm_events_ops(kvm))
1111                 goto exit;
1112
1113         init_kvm_event_record(kvm);
1114         setup_pager();
1115
1116         ret = read_events(kvm);
1117         if (ret)
1118                 goto exit;
1119
1120         sort_result(kvm);
1121         print_result(kvm);
1122
1123 exit:
1124         return ret;
1125 }
1126
1127 #define STRDUP_FAIL_EXIT(s)             \
1128         ({      char *_p;               \
1129         _p = strdup(s);         \
1130                 if (!_p)                \
1131                         return -ENOMEM; \
1132                 _p;                     \
1133         })
1134
1135 int __weak setup_kvm_events_tp(struct perf_kvm_stat *kvm __maybe_unused)
1136 {
1137         return 0;
1138 }
1139
1140 static int
1141 kvm_events_record(struct perf_kvm_stat *kvm, int argc, const char **argv)
1142 {
1143         unsigned int rec_argc, i, j, events_tp_size;
1144         const char **rec_argv;
1145         const char * const record_args[] = {
1146                 "record",
1147                 "-R",
1148                 "-m", "1024",
1149                 "-c", "1",
1150         };
1151         const char * const kvm_stat_record_usage[] = {
1152                 "perf kvm stat record [<options>]",
1153                 NULL
1154         };
1155         const char * const *events_tp;
1156         int ret;
1157
1158         events_tp_size = 0;
1159         ret = setup_kvm_events_tp(kvm);
1160         if (ret < 0) {
1161                 pr_err("Unable to setup the kvm tracepoints\n");
1162                 return ret;
1163         }
1164
1165         for (events_tp = kvm_events_tp; *events_tp; events_tp++)
1166                 events_tp_size++;
1167
1168         rec_argc = ARRAY_SIZE(record_args) + argc + 2 +
1169                    2 * events_tp_size;
1170         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1171
1172         if (rec_argv == NULL)
1173                 return -ENOMEM;
1174
1175         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1176                 rec_argv[i] = STRDUP_FAIL_EXIT(record_args[i]);
1177
1178         for (j = 0; j < events_tp_size; j++) {
1179                 rec_argv[i++] = "-e";
1180                 rec_argv[i++] = STRDUP_FAIL_EXIT(kvm_events_tp[j]);
1181         }
1182
1183         rec_argv[i++] = STRDUP_FAIL_EXIT("-o");
1184         rec_argv[i++] = STRDUP_FAIL_EXIT(kvm->file_name);
1185
1186         for (j = 1; j < (unsigned int)argc; j++, i++)
1187                 rec_argv[i] = argv[j];
1188
1189         set_option_flag(record_options, 'e', "event", PARSE_OPT_HIDDEN);
1190         set_option_flag(record_options, 0, "filter", PARSE_OPT_HIDDEN);
1191         set_option_flag(record_options, 'R', "raw-samples", PARSE_OPT_HIDDEN);
1192
1193         set_option_flag(record_options, 'F', "freq", PARSE_OPT_DISABLED);
1194         set_option_flag(record_options, 0, "group", PARSE_OPT_DISABLED);
1195         set_option_flag(record_options, 'g', NULL, PARSE_OPT_DISABLED);
1196         set_option_flag(record_options, 0, "call-graph", PARSE_OPT_DISABLED);
1197         set_option_flag(record_options, 'd', "data", PARSE_OPT_DISABLED);
1198         set_option_flag(record_options, 'T', "timestamp", PARSE_OPT_DISABLED);
1199         set_option_flag(record_options, 'P', "period", PARSE_OPT_DISABLED);
1200         set_option_flag(record_options, 'n', "no-samples", PARSE_OPT_DISABLED);
1201         set_option_flag(record_options, 'N', "no-buildid-cache", PARSE_OPT_DISABLED);
1202         set_option_flag(record_options, 'B', "no-buildid", PARSE_OPT_DISABLED);
1203         set_option_flag(record_options, 'G', "cgroup", PARSE_OPT_DISABLED);
1204         set_option_flag(record_options, 'b', "branch-any", PARSE_OPT_DISABLED);
1205         set_option_flag(record_options, 'j', "branch-filter", PARSE_OPT_DISABLED);
1206         set_option_flag(record_options, 'W', "weight", PARSE_OPT_DISABLED);
1207         set_option_flag(record_options, 0, "transaction", PARSE_OPT_DISABLED);
1208
1209         record_usage = kvm_stat_record_usage;
1210         return cmd_record(i, rec_argv, NULL);
1211 }
1212
1213 static int
1214 kvm_events_report(struct perf_kvm_stat *kvm, int argc, const char **argv)
1215 {
1216         const struct option kvm_events_report_options[] = {
1217                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1218                            "event for reporting: vmexit, "
1219                            "mmio (x86 only), ioport (x86 only)"),
1220                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1221                             "vcpu id to report"),
1222                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1223                             "key for sorting: sample(sort by samples number)"
1224                             " time (sort by avg time)"),
1225                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1226                            "analyze events only for given process id(s)"),
1227                 OPT_BOOLEAN('f', "force", &kvm->force, "don't complain, do it"),
1228                 OPT_END()
1229         };
1230
1231         const char * const kvm_events_report_usage[] = {
1232                 "perf kvm stat report [<options>]",
1233                 NULL
1234         };
1235
1236         if (argc) {
1237                 argc = parse_options(argc, argv,
1238                                      kvm_events_report_options,
1239                                      kvm_events_report_usage, 0);
1240                 if (argc)
1241                         usage_with_options(kvm_events_report_usage,
1242                                            kvm_events_report_options);
1243         }
1244
1245         if (!kvm->opts.target.pid)
1246                 kvm->opts.target.system_wide = true;
1247
1248         return kvm_events_report_vcpu(kvm);
1249 }
1250
1251 #ifdef HAVE_TIMERFD_SUPPORT
1252 static struct perf_evlist *kvm_live_event_list(void)
1253 {
1254         struct perf_evlist *evlist;
1255         char *tp, *name, *sys;
1256         int err = -1;
1257         const char * const *events_tp;
1258
1259         evlist = perf_evlist__new();
1260         if (evlist == NULL)
1261                 return NULL;
1262
1263         for (events_tp = kvm_events_tp; *events_tp; events_tp++) {
1264
1265                 tp = strdup(*events_tp);
1266                 if (tp == NULL)
1267                         goto out;
1268
1269                 /* split tracepoint into subsystem and name */
1270                 sys = tp;
1271                 name = strchr(tp, ':');
1272                 if (name == NULL) {
1273                         pr_err("Error parsing %s tracepoint: subsystem delimiter not found\n",
1274                                *events_tp);
1275                         free(tp);
1276                         goto out;
1277                 }
1278                 *name = '\0';
1279                 name++;
1280
1281                 if (perf_evlist__add_newtp(evlist, sys, name, NULL)) {
1282                         pr_err("Failed to add %s tracepoint to the list\n", *events_tp);
1283                         free(tp);
1284                         goto out;
1285                 }
1286
1287                 free(tp);
1288         }
1289
1290         err = 0;
1291
1292 out:
1293         if (err) {
1294                 perf_evlist__delete(evlist);
1295                 evlist = NULL;
1296         }
1297
1298         return evlist;
1299 }
1300
1301 static int kvm_events_live(struct perf_kvm_stat *kvm,
1302                            int argc, const char **argv)
1303 {
1304         char errbuf[BUFSIZ];
1305         int err;
1306
1307         const struct option live_options[] = {
1308                 OPT_STRING('p', "pid", &kvm->opts.target.pid, "pid",
1309                         "record events on existing process id"),
1310                 OPT_CALLBACK('m', "mmap-pages", &kvm->opts.mmap_pages, "pages",
1311                         "number of mmap data pages",
1312                         perf_evlist__parse_mmap_pages),
1313                 OPT_INCR('v', "verbose", &verbose,
1314                         "be more verbose (show counter open errors, etc)"),
1315                 OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
1316                         "system-wide collection from all CPUs"),
1317                 OPT_UINTEGER('d', "display", &kvm->display_time,
1318                         "time in seconds between display updates"),
1319                 OPT_STRING(0, "event", &kvm->report_event, "report event",
1320                         "event for reporting: "
1321                         "vmexit, mmio (x86 only), ioport (x86 only)"),
1322                 OPT_INTEGER(0, "vcpu", &kvm->trace_vcpu,
1323                         "vcpu id to report"),
1324                 OPT_STRING('k', "key", &kvm->sort_key, "sort-key",
1325                         "key for sorting: sample(sort by samples number)"
1326                         " time (sort by avg time)"),
1327                 OPT_U64(0, "duration", &kvm->duration,
1328                         "show events other than"
1329                         " HLT (x86 only) or Wait state (s390 only)"
1330                         " that take longer than duration usecs"),
1331                 OPT_UINTEGER(0, "proc-map-timeout", &kvm->opts.proc_map_timeout,
1332                                 "per thread proc mmap processing timeout in ms"),
1333                 OPT_END()
1334         };
1335         const char * const live_usage[] = {
1336                 "perf kvm stat live [<options>]",
1337                 NULL
1338         };
1339         struct perf_data_file file = {
1340                 .mode = PERF_DATA_MODE_WRITE,
1341         };
1342
1343
1344         /* event handling */
1345         kvm->tool.sample = process_sample_event;
1346         kvm->tool.comm   = perf_event__process_comm;
1347         kvm->tool.exit   = perf_event__process_exit;
1348         kvm->tool.fork   = perf_event__process_fork;
1349         kvm->tool.lost   = process_lost_event;
1350         kvm->tool.ordered_events = true;
1351         perf_tool__fill_defaults(&kvm->tool);
1352
1353         /* set defaults */
1354         kvm->display_time = 1;
1355         kvm->opts.user_interval = 1;
1356         kvm->opts.mmap_pages = 512;
1357         kvm->opts.target.uses_mmap = false;
1358         kvm->opts.target.uid_str = NULL;
1359         kvm->opts.target.uid = UINT_MAX;
1360         kvm->opts.proc_map_timeout = 500;
1361
1362         symbol__init(NULL);
1363         disable_buildid_cache();
1364
1365         use_browser = 0;
1366
1367         if (argc) {
1368                 argc = parse_options(argc, argv, live_options,
1369                                      live_usage, 0);
1370                 if (argc)
1371                         usage_with_options(live_usage, live_options);
1372         }
1373
1374         kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
1375
1376         /*
1377          * target related setups
1378          */
1379         err = target__validate(&kvm->opts.target);
1380         if (err) {
1381                 target__strerror(&kvm->opts.target, err, errbuf, BUFSIZ);
1382                 ui__warning("%s", errbuf);
1383         }
1384
1385         if (target__none(&kvm->opts.target))
1386                 kvm->opts.target.system_wide = true;
1387
1388
1389         /*
1390          * generate the event list
1391          */
1392         err = setup_kvm_events_tp(kvm);
1393         if (err < 0) {
1394                 pr_err("Unable to setup the kvm tracepoints\n");
1395                 return err;
1396         }
1397
1398         kvm->evlist = kvm_live_event_list();
1399         if (kvm->evlist == NULL) {
1400                 err = -1;
1401                 goto out;
1402         }
1403
1404         symbol_conf.nr_events = kvm->evlist->nr_entries;
1405
1406         if (perf_evlist__create_maps(kvm->evlist, &kvm->opts.target) < 0)
1407                 usage_with_options(live_usage, live_options);
1408
1409         /*
1410          * perf session
1411          */
1412         kvm->session = perf_session__new(&file, false, &kvm->tool);
1413         if (kvm->session == NULL) {
1414                 err = -1;
1415                 goto out;
1416         }
1417         kvm->session->evlist = kvm->evlist;
1418         perf_session__set_id_hdr_size(kvm->session);
1419         ordered_events__set_copy_on_queue(&kvm->session->ordered_events, true);
1420         machine__synthesize_threads(&kvm->session->machines.host, &kvm->opts.target,
1421                                     kvm->evlist->threads, false, kvm->opts.proc_map_timeout);
1422         err = kvm_live_open_events(kvm);
1423         if (err)
1424                 goto out;
1425
1426         err = kvm_events_live_report(kvm);
1427
1428 out:
1429         perf_session__delete(kvm->session);
1430         kvm->session = NULL;
1431         perf_evlist__delete(kvm->evlist);
1432
1433         return err;
1434 }
1435 #endif
1436
1437 static void print_kvm_stat_usage(void)
1438 {
1439         printf("Usage: perf kvm stat <command>\n\n");
1440
1441         printf("# Available commands:\n");
1442         printf("\trecord: record kvm events\n");
1443         printf("\treport: report statistical data of kvm events\n");
1444         printf("\tlive:   live reporting of statistical data of kvm events\n");
1445
1446         printf("\nOtherwise, it is the alias of 'perf stat':\n");
1447 }
1448
1449 static int kvm_cmd_stat(const char *file_name, int argc, const char **argv)
1450 {
1451         struct perf_kvm_stat kvm = {
1452                 .file_name = file_name,
1453
1454                 .trace_vcpu     = -1,
1455                 .report_event   = "vmexit",
1456                 .sort_key       = "sample",
1457
1458         };
1459
1460         if (argc == 1) {
1461                 print_kvm_stat_usage();
1462                 goto perf_stat;
1463         }
1464
1465         if (!strncmp(argv[1], "rec", 3))
1466                 return kvm_events_record(&kvm, argc - 1, argv + 1);
1467
1468         if (!strncmp(argv[1], "rep", 3))
1469                 return kvm_events_report(&kvm, argc - 1 , argv + 1);
1470
1471 #ifdef HAVE_TIMERFD_SUPPORT
1472         if (!strncmp(argv[1], "live", 4))
1473                 return kvm_events_live(&kvm, argc - 1 , argv + 1);
1474 #endif
1475
1476 perf_stat:
1477         return cmd_stat(argc, argv, NULL);
1478 }
1479 #endif /* HAVE_KVM_STAT_SUPPORT */
1480
1481 static int __cmd_record(const char *file_name, int argc, const char **argv)
1482 {
1483         int rec_argc, i = 0, j;
1484         const char **rec_argv;
1485
1486         rec_argc = argc + 2;
1487         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1488         rec_argv[i++] = strdup("record");
1489         rec_argv[i++] = strdup("-o");
1490         rec_argv[i++] = strdup(file_name);
1491         for (j = 1; j < argc; j++, i++)
1492                 rec_argv[i] = argv[j];
1493
1494         BUG_ON(i != rec_argc);
1495
1496         return cmd_record(i, rec_argv, NULL);
1497 }
1498
1499 static int __cmd_report(const char *file_name, int argc, const char **argv)
1500 {
1501         int rec_argc, i = 0, j;
1502         const char **rec_argv;
1503
1504         rec_argc = argc + 2;
1505         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1506         rec_argv[i++] = strdup("report");
1507         rec_argv[i++] = strdup("-i");
1508         rec_argv[i++] = strdup(file_name);
1509         for (j = 1; j < argc; j++, i++)
1510                 rec_argv[i] = argv[j];
1511
1512         BUG_ON(i != rec_argc);
1513
1514         return cmd_report(i, rec_argv, NULL);
1515 }
1516
1517 static int
1518 __cmd_buildid_list(const char *file_name, int argc, const char **argv)
1519 {
1520         int rec_argc, i = 0, j;
1521         const char **rec_argv;
1522
1523         rec_argc = argc + 2;
1524         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1525         rec_argv[i++] = strdup("buildid-list");
1526         rec_argv[i++] = strdup("-i");
1527         rec_argv[i++] = strdup(file_name);
1528         for (j = 1; j < argc; j++, i++)
1529                 rec_argv[i] = argv[j];
1530
1531         BUG_ON(i != rec_argc);
1532
1533         return cmd_buildid_list(i, rec_argv, NULL);
1534 }
1535
1536 int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
1537 {
1538         const char *file_name = NULL;
1539         const struct option kvm_options[] = {
1540                 OPT_STRING('i', "input", &file_name, "file",
1541                            "Input file name"),
1542                 OPT_STRING('o', "output", &file_name, "file",
1543                            "Output file name"),
1544                 OPT_BOOLEAN(0, "guest", &perf_guest,
1545                             "Collect guest os data"),
1546                 OPT_BOOLEAN(0, "host", &perf_host,
1547                             "Collect host os data"),
1548                 OPT_STRING(0, "guestmount", &symbol_conf.guestmount, "directory",
1549                            "guest mount directory under which every guest os"
1550                            " instance has a subdir"),
1551                 OPT_STRING(0, "guestvmlinux", &symbol_conf.default_guest_vmlinux_name,
1552                            "file", "file saving guest os vmlinux"),
1553                 OPT_STRING(0, "guestkallsyms", &symbol_conf.default_guest_kallsyms,
1554                            "file", "file saving guest os /proc/kallsyms"),
1555                 OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
1556                            "file", "file saving guest os /proc/modules"),
1557                 OPT_INCR('v', "verbose", &verbose,
1558                             "be more verbose (show counter open errors, etc)"),
1559                 OPT_END()
1560         };
1561
1562         const char *const kvm_subcommands[] = { "top", "record", "report", "diff",
1563                                                 "buildid-list", "stat", NULL };
1564         const char *kvm_usage[] = { NULL, NULL };
1565
1566         perf_host  = 0;
1567         perf_guest = 1;
1568
1569         argc = parse_options_subcommand(argc, argv, kvm_options, kvm_subcommands, kvm_usage,
1570                                         PARSE_OPT_STOP_AT_NON_OPTION);
1571         if (!argc)
1572                 usage_with_options(kvm_usage, kvm_options);
1573
1574         if (!perf_host)
1575                 perf_guest = 1;
1576
1577         if (!file_name) {
1578                 file_name = get_filename_for_perf_kvm();
1579
1580                 if (!file_name) {
1581                         pr_err("Failed to allocate memory for filename\n");
1582                         return -ENOMEM;
1583                 }
1584         }
1585
1586         if (!strncmp(argv[0], "rec", 3))
1587                 return __cmd_record(file_name, argc, argv);
1588         else if (!strncmp(argv[0], "rep", 3))
1589                 return __cmd_report(file_name, argc, argv);
1590         else if (!strncmp(argv[0], "diff", 4))
1591                 return cmd_diff(argc, argv, NULL);
1592         else if (!strncmp(argv[0], "top", 3))
1593                 return cmd_top(argc, argv, NULL);
1594         else if (!strncmp(argv[0], "buildid-list", 12))
1595                 return __cmd_buildid_list(file_name, argc, argv);
1596 #ifdef HAVE_KVM_STAT_SUPPORT
1597         else if (!strncmp(argv[0], "stat", 4))
1598                 return kvm_cmd_stat(file_name, argc, argv);
1599 #endif
1600         else
1601                 usage_with_options(kvm_usage, kvm_options);
1602
1603         return 0;
1604 }