tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include <sys/mman.h>
   3 #include "event.h"
   4 #include "debug.h"
   5 #include "hist.h"
   6 #include "machine.h"
   7 #include "sort.h"
   8 #include "string.h"
   9 #include "strlist.h"
  10 #include "thread.h"
  11 #include "thread_map.h"
  12 #include "symbol/kallsyms.h"
  13
  14 static const char *perf_event__names[] = {
  15         [0]                                     = "TOTAL",
  16         [PERF_RECORD_MMAP]                      = "MMAP",
  17         [PERF_RECORD_MMAP2]                     = "MMAP2",
  18         [PERF_RECORD_LOST]                      = "LOST",
  19         [PERF_RECORD_COMM]                      = "COMM",
  20         [PERF_RECORD_EXIT]                      = "EXIT",
  21         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  22         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  23         [PERF_RECORD_FORK]                      = "FORK",
  24         [PERF_RECORD_READ]                      = "READ",
  25         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  26         [PERF_RECORD_AUX]                       = "AUX",
  27         [PERF_RECORD_ITRACE_START]              = "ITRACE_START",
  28         [PERF_RECORD_LOST_SAMPLES]              = "LOST_SAMPLES",
  29         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  30         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  31         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  32         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  33         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  34         [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
  35         [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
  36         [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
  37         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
  38 };
  39
  40 const char *perf_event__name(unsigned int id)
  41 {
  42         if (id >= ARRAY_SIZE(perf_event__names))
  43                 return "INVALID";
  44         if (!perf_event__names[id])
  45                 return "UNKNOWN";
  46         return perf_event__names[id];
  47 }
  48
  49 static struct perf_sample synth_sample = {
  50         .pid       = -1,
  51         .tid       = -1,
  52         .time      = -1,
  53         .stream_id = -1,
  54         .cpu       = -1,
  55         .period    = 1,
  56 };
  57
  58 /*
  59  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  60  * the comm, tgid and ppid.
  61  */
  62 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
  63                                     pid_t *tgid, pid_t *ppid)
  64 {
  65         char filename[PATH_MAX];
  66         char bf[4096];
  67         int fd;
  68         size_t size = 0, n;
  69         char *nl, *name, *tgids, *ppids;
  70
  71         *tgid = -1;
  72         *ppid = -1;
  73
  74         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  75
  76         fd = open(filename, O_RDONLY);
  77         if (fd < 0) {
  78                 pr_debug("couldn't open %s\n", filename);
  79                 return -1;
  80         }
  81
  82         n = read(fd, bf, sizeof(bf) - 1);
  83         close(fd);
  84         if (n <= 0) {
  85                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  86                            pid);
  87                 return -1;
  88         }
  89         bf[n] = '\0';
  90
  91         name = strstr(bf, "Name:");
  92         tgids = strstr(bf, "Tgid:");
  93         ppids = strstr(bf, "PPid:");
  94
  95         if (name) {
  96                 name += 5;  /* strlen("Name:") */
  97
  98                 while (*name && isspace(*name))
  99                         ++name;
 100
 101                 nl = strchr(name, '\n');
 102                 if (nl)
 103                         *nl = '\0';
 104
 105                 size = strlen(name);
 106                 if (size >= len)
 107                         size = len - 1;
 108                 memcpy(comm, name, size);
 109                 comm[size] = '\0';
 110         } else {
 111                 pr_debug("Name: string not found for pid %d\n", pid);
 112         }
 113
 114         if (tgids) {
 115                 tgids += 5;  /* strlen("Tgid:") */
 116                 *tgid = atoi(tgids);
 117         } else {
 118                 pr_debug("Tgid: string not found for pid %d\n", pid);
 119         }
 120
 121         if (ppids) {
 122                 ppids += 5;  /* strlen("PPid:") */
 123                 *ppid = atoi(ppids);
 124         } else {
 125                 pr_debug("PPid: string not found for pid %d\n", pid);
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
 132                                     struct machine *machine,
 133                                     pid_t *tgid, pid_t *ppid)
 134 {
 135         size_t size;
 136
 137         *ppid = -1;
 138
 139         memset(&event->comm, 0, sizeof(event->comm));
 140
 141         if (machine__is_host(machine)) {
 142                 if (perf_event__get_comm_ids(pid, event->comm.comm,
 143                                              sizeof(event->comm.comm),
 144                                              tgid, ppid) != 0) {
 145                         return -1;
 146                 }
 147         } else {
 148                 *tgid = machine->pid;
 149         }
 150
 151         if (*tgid < 0)
 152                 return -1;
 153
 154         event->comm.pid = *tgid;
 155         event->comm.header.type = PERF_RECORD_COMM;
 156
 157         size = strlen(event->comm.comm) + 1;
 158         size = PERF_ALIGN(size, sizeof(u64));
 159         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 160         event->comm.header.size = (sizeof(event->comm) -
 161                                 (sizeof(event->comm.comm) - size) +
 162                                 machine->id_hdr_size);
 163         event->comm.tid = pid;
 164
 165         return 0;
 166 }
 167
 168 static pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 169                                          union perf_event *event, pid_t pid,
 170                                          perf_event__handler_t process,
 171                                          struct machine *machine)
 172 {
 173         pid_t tgid, ppid;
 174
 175         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
 176                 return -1;
 177
 178         if (process(tool, event, &synth_sample, machine) != 0)
 179                 return -1;
 180
 181         return tgid;
 182 }
 183
 184 static int perf_event__synthesize_fork(struct perf_tool *tool,
 185                                        union perf_event *event,
 186                                        pid_t pid, pid_t tgid, pid_t ppid,
 187                                        perf_event__handler_t process,
 188                                        struct machine *machine)
 189 {
 190         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 191
 192         /*
 193          * for main thread set parent to ppid from status file. For other
 194          * threads set parent pid to main thread. ie., assume main thread
 195          * spawns all threads in a process
 196         */
 197         if (tgid == pid) {
 198                 event->fork.ppid = ppid;
 199                 event->fork.ptid = ppid;
 200         } else {
 201                 event->fork.ppid = tgid;
 202                 event->fork.ptid = tgid;
 203         }
 204         event->fork.pid  = tgid;
 205         event->fork.tid  = pid;
 206         event->fork.header.type = PERF_RECORD_FORK;
 207
 208         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 209
 210         if (process(tool, event, &synth_sample, machine) != 0)
 211                 return -1;
 212
 213         return 0;
 214 }
 215
 216 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 217                                        union perf_event *event,
 218                                        pid_t pid, pid_t tgid,
 219                                        perf_event__handler_t process,
 220                                        struct machine *machine,
 221                                        bool mmap_data,
 222                                        unsigned int proc_map_timeout)
 223 {
 224         char filename[PATH_MAX];
 225         FILE *fp;
 226         unsigned long long t;
 227         bool truncation = false;
 228         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 229         int rc = 0;
 230
 231         if (machine__is_default_guest(machine))
 232                 return 0;
 233
 234         snprintf(filename, sizeof(filename), "%s/proc/%d/maps",
 235                  machine->root_dir, pid);
 236
 237         fp = fopen(filename, "r");
 238         if (fp == NULL) {
 239                 /*
 240                  * We raced with a task exiting - just return:
 241                  */
 242                 pr_debug("couldn't open %s\n", filename);
 243                 return -1;
 244         }
 245
 246         event->header.type = PERF_RECORD_MMAP2;
 247         t = rdclock();
 248
 249         while (1) {
 250                 char bf[BUFSIZ];
 251                 char prot[5];
 252                 char execname[PATH_MAX];
 253                 char anonstr[] = "//anon";
 254                 unsigned int ino;
 255                 size_t size;
 256                 ssize_t n;
 257
 258                 if (fgets(bf, sizeof(bf), fp) == NULL)
 259                         break;
 260
 261                 if ((rdclock() - t) > timeout) {
 262                         pr_warning("Reading %s time out. "
 263                                    "You may want to increase "
 264                                    "the time limit by --proc-map-timeout\n",
 265                                    filename);
 266                         truncation = true;
 267                         goto out;
 268                 }
 269
 270                 /* ensure null termination since stack will be reused. */
 271                 strcpy(execname, "");
 272
 273                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 274                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
 275                        &event->mmap2.start, &event->mmap2.len, prot,
 276                        &event->mmap2.pgoff, &event->mmap2.maj,
 277                        &event->mmap2.min,
 278                        &ino, execname);
 279
 280                 /*
 281                  * Anon maps don't have the execname.
 282                  */
 283                 if (n < 7)
 284                         continue;
 285
 286                 event->mmap2.ino = (u64)ino;
 287
 288                 /*
 289                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 290                  */
 291                 if (machine__is_host(machine))
 292                         event->header.misc = PERF_RECORD_MISC_USER;
 293                 else
 294                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 295
 296                 /* map protection and flags bits */
 297                 event->mmap2.prot = 0;
 298                 event->mmap2.flags = 0;
 299                 if (prot[0] == 'r')
 300                         event->mmap2.prot |= PROT_READ;
 301                 if (prot[1] == 'w')
 302                         event->mmap2.prot |= PROT_WRITE;
 303                 if (prot[2] == 'x')
 304                         event->mmap2.prot |= PROT_EXEC;
 305
 306                 if (prot[3] == 's')
 307                         event->mmap2.flags |= MAP_SHARED;
 308                 else
 309                         event->mmap2.flags |= MAP_PRIVATE;
 310
 311                 if (prot[2] != 'x') {
 312                         if (!mmap_data || prot[0] != 'r')
 313                                 continue;
 314
 315                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 316                 }
 317
 318 out:
 319                 if (truncation)
 320                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 321
 322                 if (!strcmp(execname, ""))
 323                         strcpy(execname, anonstr);
 324
 325                 size = strlen(execname) + 1;
 326                 memcpy(event->mmap2.filename, execname, size);
 327                 size = PERF_ALIGN(size, sizeof(u64));
 328                 event->mmap2.len -= event->mmap.start;
 329                 event->mmap2.header.size = (sizeof(event->mmap2) -
 330                                         (sizeof(event->mmap2.filename) - size));
 331                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 332                 event->mmap2.header.size += machine->id_hdr_size;
 333                 event->mmap2.pid = tgid;
 334                 event->mmap2.tid = pid;
 335
 336                 if (process(tool, event, &synth_sample, machine) != 0) {
 337                         rc = -1;
 338                         break;
 339                 }
 340
 341                 if (truncation)
 342                         break;
 343         }
 344
 345         fclose(fp);
 346         return rc;
 347 }
 348
 349 int perf_event__synthesize_modules(struct perf_tool *tool,
 350                                    perf_event__handler_t process,
 351                                    struct machine *machine)
 352 {
 353         int rc = 0;
 354         struct map *pos;
 355         struct map_groups *kmaps = &machine->kmaps;
 356         struct maps *maps = &kmaps->maps[MAP__FUNCTION];
 357         union perf_event *event = zalloc((sizeof(event->mmap) +
 358                                           machine->id_hdr_size));
 359         if (event == NULL) {
 360                 pr_debug("Not enough memory synthesizing mmap event "
 361                          "for kernel modules\n");
 362                 return -1;
 363         }
 364
 365         event->header.type = PERF_RECORD_MMAP;
 366
 367         /*
 368          * kernel uses 0 for user space maps, see kernel/perf_event.c
 369          * __perf_event_mmap
 370          */
 371         if (machine__is_host(machine))
 372                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 373         else
 374                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 375
 376         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 377                 size_t size;
 378
 379                 if (pos->dso->kernel)
 380                         continue;
 381
 382                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 383                 event->mmap.header.type = PERF_RECORD_MMAP;
 384                 event->mmap.header.size = (sizeof(event->mmap) -
 385                                         (sizeof(event->mmap.filename) - size));
 386                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 387                 event->mmap.header.size += machine->id_hdr_size;
 388                 event->mmap.start = pos->start;
 389                 event->mmap.len   = pos->end - pos->start;
 390                 event->mmap.pid   = machine->pid;
 391
 392                 memcpy(event->mmap.filename, pos->dso->long_name,
 393                        pos->dso->long_name_len + 1);
 394                 if (process(tool, event, &synth_sample, machine) != 0) {
 395                         rc = -1;
 396                         break;
 397                 }
 398         }
 399
 400         free(event);
 401         return rc;
 402 }
 403
 404 static int __event__synthesize_thread(union perf_event *comm_event,
 405                                       union perf_event *mmap_event,
 406                                       union perf_event *fork_event,
 407                                       pid_t pid, int full,
 408                                           perf_event__handler_t process,
 409                                       struct perf_tool *tool,
 410                                       struct machine *machine,
 411                                       bool mmap_data,
 412                                       unsigned int proc_map_timeout)
 413 {
 414         char filename[PATH_MAX];
 415         DIR *tasks;
 416         struct dirent dirent, *next;
 417         pid_t tgid, ppid;
 418         int rc = 0;
 419
 420         /* special case: only send one comm event using passed in pid */
 421         if (!full) {
 422                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 423                                                    process, machine);
 424
 425                 if (tgid == -1)
 426                         return -1;
 427
 428                 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 429                                                           process, machine, mmap_data,
 430                                                           proc_map_timeout);
 431         }
 432
 433         if (machine__is_default_guest(machine))
 434                 return 0;
 435
 436         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 437                  machine->root_dir, pid);
 438
 439         tasks = opendir(filename);
 440         if (tasks == NULL) {
 441                 pr_debug("couldn't open %s\n", filename);
 442                 return 0;
 443         }
 444
 445         while (!readdir_r(tasks, &dirent, &next) && next) {
 446                 char *end;
 447                 pid_t _pid;
 448
 449                 _pid = strtol(dirent.d_name, &end, 10);
 450                 if (*end)
 451                         continue;
 452
 453                 rc = -1;
 454                 if (perf_event__prepare_comm(comm_event, _pid, machine,
 455                                              &tgid, &ppid) != 0)
 456                         break;
 457
 458                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 459                                                 ppid, process, machine) < 0)
 460                         break;
 461                 /*
 462                  * Send the prepared comm event
 463                  */
 464                 if (process(tool, comm_event, &synth_sample, machine) != 0)
 465                         break;
 466
 467                 rc = 0;
 468                 if (_pid == pid) {
 469                         /* process the parent's maps too */
 470                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 471                                                 process, machine, mmap_data, proc_map_timeout);
 472                         if (rc)
 473                                 break;
 474                 }
 475         }
 476
 477         closedir(tasks);
 478         return rc;
 479 }
 480
 481 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 482                                       struct thread_map *threads,
 483                                       perf_event__handler_t process,
 484                                       struct machine *machine,
 485                                       bool mmap_data,
 486                                       unsigned int proc_map_timeout)
 487 {
 488         union perf_event *comm_event, *mmap_event, *fork_event;
 489         int err = -1, thread, j;
 490
 491         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 492         if (comm_event == NULL)
 493                 goto out;
 494
 495         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 496         if (mmap_event == NULL)
 497                 goto out_free_comm;
 498
 499         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 500         if (fork_event == NULL)
 501                 goto out_free_mmap;
 502
 503         err = 0;
 504         for (thread = 0; thread < threads->nr; ++thread) {
 505                 if (__event__synthesize_thread(comm_event, mmap_event,
 506                                                fork_event,
 507                                                thread_map__pid(threads, thread), 0,
 508                                                process, tool, machine,
 509                                                mmap_data, proc_map_timeout)) {
 510                         err = -1;
 511                         break;
 512                 }
 513
 514                 /*
 515                  * comm.pid is set to thread group id by
 516                  * perf_event__synthesize_comm
 517                  */
 518                 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
 519                         bool need_leader = true;
 520
 521                         /* is thread group leader in thread_map? */
 522                         for (j = 0; j < threads->nr; ++j) {
 523                                 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
 524                                         need_leader = false;
 525                                         break;
 526                                 }
 527                         }
 528
 529                         /* if not, generate events for it */
 530                         if (need_leader &&
 531                             __event__synthesize_thread(comm_event, mmap_event,
 532                                                        fork_event,
 533                                                        comm_event->comm.pid, 0,
 534                                                        process, tool, machine,
 535                                                        mmap_data, proc_map_timeout)) {
 536                                 err = -1;
 537                                 break;
 538                         }
 539                 }
 540         }
 541         free(fork_event);
 542 out_free_mmap:
 543         free(mmap_event);
 544 out_free_comm:
 545         free(comm_event);
 546 out:
 547         return err;
 548 }
 549
 550 int perf_event__synthesize_threads(struct perf_tool *tool,
 551                                    perf_event__handler_t process,
 552                                    struct machine *machine,
 553                                    bool mmap_data,
 554                                    unsigned int proc_map_timeout)
 555 {
 556         DIR *proc;
 557         char proc_path[PATH_MAX];
 558         struct dirent dirent, *next;
 559         union perf_event *comm_event, *mmap_event, *fork_event;
 560         int err = -1;
 561
 562         if (machine__is_default_guest(machine))
 563                 return 0;
 564
 565         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 566         if (comm_event == NULL)
 567                 goto out;
 568
 569         mmap_event = malloc(sizeof(mmap_event->mmap) + machine->id_hdr_size);
 570         if (mmap_event == NULL)
 571                 goto out_free_comm;
 572
 573         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 574         if (fork_event == NULL)
 575                 goto out_free_mmap;
 576
 577         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 578         proc = opendir(proc_path);
 579
 580         if (proc == NULL)
 581                 goto out_free_fork;
 582
 583         while (!readdir_r(proc, &dirent, &next) && next) {
 584                 char *end;
 585                 pid_t pid = strtol(dirent.d_name, &end, 10);
 586
 587                 if (*end) /* only interested in proper numerical dirents */
 588                         continue;
 589                 /*
 590                  * We may race with exiting thread, so don't stop just because
 591                  * one thread couldn't be synthesized.
 592                  */
 593                 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
 594                                            1, process, tool, machine, mmap_data,
 595                                            proc_map_timeout);
 596         }
 597
 598         err = 0;
 599         closedir(proc);
 600 out_free_fork:
 601         free(fork_event);
 602 out_free_mmap:
 603         free(mmap_event);
 604 out_free_comm:
 605         free(comm_event);
 606 out:
 607         return err;
 608 }
 609
 610 struct process_symbol_args {
 611         const char *name;
 612         u64        start;
 613 };
 614
 615 static int find_symbol_cb(void *arg, const char *name, char type,
 616                           u64 start)
 617 {
 618         struct process_symbol_args *args = arg;
 619
 620         /*
 621          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 622          * an 'A' to the same address as "_stext".
 623          */
 624         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 625               type == 'A') || strcmp(name, args->name))
 626                 return 0;
 627
 628         args->start = start;
 629         return 1;
 630 }
 631
 632 u64 kallsyms__get_function_start(const char *kallsyms_filename,
 633                                  const char *symbol_name)
 634 {
 635         struct process_symbol_args args = { .name = symbol_name, };
 636
 637         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
 638                 return 0;
 639
 640         return args.start;
 641 }
 642
 643 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 644                                        perf_event__handler_t process,
 645                                        struct machine *machine)
 646 {
 647         size_t size;
 648         const char *mmap_name;
 649         char name_buff[PATH_MAX];
 650         struct map *map;
 651         struct kmap *kmap;
 652         int err;
 653         union perf_event *event;
 654
 655         if (machine->vmlinux_maps[0] == NULL)
 656                 return -1;
 657
 658         /*
 659          * We should get this from /sys/kernel/sections/.text, but till that is
 660          * available use this, and after it is use this as a fallback for older
 661          * kernels.
 662          */
 663         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
 664         if (event == NULL) {
 665                 pr_debug("Not enough memory synthesizing mmap event "
 666                          "for kernel modules\n");
 667                 return -1;
 668         }
 669
 670         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 671         if (machine__is_host(machine)) {
 672                 /*
 673                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 674                  * see kernel/perf_event.c __perf_event_mmap
 675                  */
 676                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 677         } else {
 678                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 679         }
 680
 681         map = machine->vmlinux_maps[MAP__FUNCTION];
 682         kmap = map__kmap(map);
 683         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 684                         "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
 685         size = PERF_ALIGN(size, sizeof(u64));
 686         event->mmap.header.type = PERF_RECORD_MMAP;
 687         event->mmap.header.size = (sizeof(event->mmap) -
 688                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 689         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 690         event->mmap.start = map->start;
 691         event->mmap.len   = map->end - event->mmap.start;
 692         event->mmap.pid   = machine->pid;
 693
 694         err = process(tool, event, &synth_sample, machine);
 695         free(event);
 696
 697         return err;
 698 }
 699
 700 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
 701 {
 702         const char *s;
 703
 704         if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
 705                 s = " exec";
 706         else
 707                 s = "";
 708
 709         return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
 710 }
 711
 712 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
 713                              union perf_event *event,
 714                              struct perf_sample *sample,
 715                              struct machine *machine)
 716 {
 717         return machine__process_comm_event(machine, event, sample);
 718 }
 719
 720 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
 721                              union perf_event *event,
 722                              struct perf_sample *sample,
 723                              struct machine *machine)
 724 {
 725         return machine__process_lost_event(machine, event, sample);
 726 }
 727
 728 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
 729                             union perf_event *event,
 730                             struct perf_sample *sample __maybe_unused,
 731                             struct machine *machine)
 732 {
 733         return machine__process_aux_event(machine, event);
 734 }
 735
 736 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
 737                                      union perf_event *event,
 738                                      struct perf_sample *sample __maybe_unused,
 739                                      struct machine *machine)
 740 {
 741         return machine__process_itrace_start_event(machine, event);
 742 }
 743
 744 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
 745                                      union perf_event *event,
 746                                      struct perf_sample *sample,
 747                                      struct machine *machine)
 748 {
 749         return machine__process_lost_samples_event(machine, event, sample);
 750 }
 751
 752 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
 753 {
 754         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
 755                        event->mmap.pid, event->mmap.tid, event->mmap.start,
 756                        event->mmap.len, event->mmap.pgoff,
 757                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
 758                        event->mmap.filename);
 759 }
 760
 761 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
 762 {
 763         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
 764                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
 765                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
 766                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
 767                        event->mmap2.min, event->mmap2.ino,
 768                        event->mmap2.ino_generation,
 769                        (event->mmap2.prot & PROT_READ) ? 'r' : '-',
 770                        (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
 771                        (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
 772                        (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
 773                        event->mmap2.filename);
 774 }
 775
 776 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
 777                              union perf_event *event,
 778                              struct perf_sample *sample,
 779                              struct machine *machine)
 780 {
 781         return machine__process_mmap_event(machine, event, sample);
 782 }
 783
 784 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
 785                              union perf_event *event,
 786                              struct perf_sample *sample,
 787                              struct machine *machine)
 788 {
 789         return machine__process_mmap2_event(machine, event, sample);
 790 }
 791
 792 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
 793 {
 794         return fprintf(fp, "(%d:%d):(%d:%d)\n",
 795                        event->fork.pid, event->fork.tid,
 796                        event->fork.ppid, event->fork.ptid);
 797 }
 798
 799 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
 800                              union perf_event *event,
 801                              struct perf_sample *sample,
 802                              struct machine *machine)
 803 {
 804         return machine__process_fork_event(machine, event, sample);
 805 }
 806
 807 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
 808                              union perf_event *event,
 809                              struct perf_sample *sample,
 810                              struct machine *machine)
 811 {
 812         return machine__process_exit_event(machine, event, sample);
 813 }
 814
 815 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
 816 {
 817         return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
 818                        event->aux.aux_offset, event->aux.aux_size,
 819                        event->aux.flags,
 820                        event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
 821                        event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
 822 }
 823
 824 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
 825 {
 826         return fprintf(fp, " pid: %u tid: %u\n",
 827                        event->itrace_start.pid, event->itrace_start.tid);
 828 }
 829
 830 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
 831 {
 832         size_t ret = fprintf(fp, "PERF_RECORD_%s",
 833                              perf_event__name(event->header.type));
 834
 835         switch (event->header.type) {
 836         case PERF_RECORD_COMM:
 837                 ret += perf_event__fprintf_comm(event, fp);
 838                 break;
 839         case PERF_RECORD_FORK:
 840         case PERF_RECORD_EXIT:
 841                 ret += perf_event__fprintf_task(event, fp);
 842                 break;
 843         case PERF_RECORD_MMAP:
 844                 ret += perf_event__fprintf_mmap(event, fp);
 845                 break;
 846         case PERF_RECORD_MMAP2:
 847                 ret += perf_event__fprintf_mmap2(event, fp);
 848                 break;
 849         case PERF_RECORD_AUX:
 850                 ret += perf_event__fprintf_aux(event, fp);
 851                 break;
 852         case PERF_RECORD_ITRACE_START:
 853                 ret += perf_event__fprintf_itrace_start(event, fp);
 854                 break;
 855         default:
 856                 ret += fprintf(fp, "\n");
 857         }
 858
 859         return ret;
 860 }
 861
 862 int perf_event__process(struct perf_tool *tool __maybe_unused,
 863                         union perf_event *event,
 864                         struct perf_sample *sample,
 865                         struct machine *machine)
 866 {
 867         return machine__process_event(machine, event, sample);
 868 }
 869
 870 void thread__find_addr_map(struct thread *thread, u8 cpumode,
 871                            enum map_type type, u64 addr,
 872                            struct addr_location *al)
 873 {
 874         struct map_groups *mg = thread->mg;
 875         struct machine *machine = mg->machine;
 876         bool load_map = false;
 877
 878         al->machine = machine;
 879         al->thread = thread;
 880         al->addr = addr;
 881         al->cpumode = cpumode;
 882         al->filtered = 0;
 883
 884         if (machine == NULL) {
 885                 al->map = NULL;
 886                 return;
 887         }
 888
 889         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
 890                 al->level = 'k';
 891                 mg = &machine->kmaps;
 892                 load_map = true;
 893         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
 894                 al->level = '.';
 895         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
 896                 al->level = 'g';
 897                 mg = &machine->kmaps;
 898                 load_map = true;
 899         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
 900                 al->level = 'u';
 901         } else {
 902                 al->level = 'H';
 903                 al->map = NULL;
 904
 905                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
 906                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
 907                         !perf_guest)
 908                         al->filtered |= (1 << HIST_FILTER__GUEST);
 909                 if ((cpumode == PERF_RECORD_MISC_USER ||
 910                         cpumode == PERF_RECORD_MISC_KERNEL) &&
 911                         !perf_host)
 912                         al->filtered |= (1 << HIST_FILTER__HOST);
 913
 914                 return;
 915         }
 916 try_again:
 917         al->map = map_groups__find(mg, type, al->addr);
 918         if (al->map == NULL) {
 919                 /*
 920                  * If this is outside of all known maps, and is a negative
 921                  * address, try to look it up in the kernel dso, as it might be
 922                  * a vsyscall or vdso (which executes in user-mode).
 923                  *
 924                  * XXX This is nasty, we should have a symbol list in the
 925                  * "[vdso]" dso, but for now lets use the old trick of looking
 926                  * in the whole kernel symbol list.
 927                  */
 928                 if (cpumode == PERF_RECORD_MISC_USER && machine &&
 929                     mg != &machine->kmaps &&
 930                     machine__kernel_ip(machine, al->addr)) {
 931                         mg = &machine->kmaps;
 932                         load_map = true;
 933                         goto try_again;
 934                 }
 935         } else {
 936                 /*
 937                  * Kernel maps might be changed when loading symbols so loading
 938                  * must be done prior to using kernel maps.
 939                  */
 940                 if (load_map)
 941                         map__load(al->map, machine->symbol_filter);
 942                 al->addr = al->map->map_ip(al->map, al->addr);
 943         }
 944 }
 945
 946 void thread__find_addr_location(struct thread *thread,
 947                                 u8 cpumode, enum map_type type, u64 addr,
 948                                 struct addr_location *al)
 949 {
 950         thread__find_addr_map(thread, cpumode, type, addr, al);
 951         if (al->map != NULL)
 952                 al->sym = map__find_symbol(al->map, al->addr,
 953                                            thread->mg->machine->symbol_filter);
 954         else
 955                 al->sym = NULL;
 956 }
 957
 958 /*
 959  * Callers need to drop the reference to al->thread, obtained in
 960  * machine__findnew_thread()
 961  */
 962 int perf_event__preprocess_sample(const union perf_event *event,
 963                                   struct machine *machine,
 964                                   struct addr_location *al,
 965                                   struct perf_sample *sample)
 966 {
 967         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 968         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 969                                                         sample->tid);
 970
 971         if (thread == NULL)
 972                 return -1;
 973
 974         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 975         /*
 976          * Have we already created the kernel maps for this machine?
 977          *
 978          * This should have happened earlier, when we processed the kernel MMAP
 979          * events, but for older perf.data files there was no such thing, so do
 980          * it now.
 981          */
 982         if (cpumode == PERF_RECORD_MISC_KERNEL &&
 983             machine->vmlinux_maps[MAP__FUNCTION] == NULL)
 984                 machine__create_kernel_maps(machine);
 985
 986         thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->ip, al);
 987         dump_printf(" ...... dso: %s\n",
 988                     al->map ? al->map->dso->long_name :
 989                         al->level == 'H' ? "[hypervisor]" : "<not found>");
 990
 991         if (thread__is_filtered(thread))
 992                 al->filtered |= (1 << HIST_FILTER__THREAD);
 993
 994         al->sym = NULL;
 995         al->cpu = sample->cpu;
 996
 997         if (al->map) {
 998                 struct dso *dso = al->map->dso;
 999
1000                 if (symbol_conf.dso_list &&
1001                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1002                                                   dso->short_name) ||
1003                                (dso->short_name != dso->long_name &&
1004                                 strlist__has_entry(symbol_conf.dso_list,
1005                                                    dso->long_name))))) {
1006                         al->filtered |= (1 << HIST_FILTER__DSO);
1007                 }
1008
1009                 al->sym = map__find_symbol(al->map, al->addr,
1010                                            machine->symbol_filter);
1011         }
1012
1013         if (symbol_conf.sym_list &&
1014                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1015                                                 al->sym->name))) {
1016                 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1017         }
1018
1019         return 0;
1020 }
1021
1022 /*
1023  * The preprocess_sample method will return with reference counts for the
1024  * in it, when done using (and perhaps getting ref counts if needing to
1025  * keep a pointer to one of those entries) it must be paired with
1026  * addr_location__put(), so that the refcounts can be decremented.
1027  */
1028 void addr_location__put(struct addr_location *al)
1029 {
1030         thread__zput(al->thread);
1031 }
1032
1033 bool is_bts_event(struct perf_event_attr *attr)
1034 {
1035         return attr->type == PERF_TYPE_HARDWARE &&
1036                (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1037                attr->sample_period == 1;
1038 }
1039
1040 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1041 {
1042         if (attr->type == PERF_TYPE_SOFTWARE &&
1043             (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1044              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1045              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1046                 return true;
1047
1048         if (is_bts_event(attr))
1049                 return true;
1050
1051         return false;
1052 }
1053
1054 void perf_event__preprocess_sample_addr(union perf_event *event,
1055                                         struct perf_sample *sample,
1056                                         struct thread *thread,
1057                                         struct addr_location *al)
1058 {
1059         u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1060
1061         thread__find_addr_map(thread, cpumode, MAP__FUNCTION, sample->addr, al);
1062         if (!al->map)
1063                 thread__find_addr_map(thread, cpumode, MAP__VARIABLE,
1064                                       sample->addr, al);
1065
1066         al->cpu = sample->cpu;
1067         al->sym = NULL;
1068
1069         if (al->map)
1070                 al->sym = map__find_symbol(al->map, al->addr, NULL);
1071 }