tools/perf/util/event.c

   1 #include <linux/types.h>
   2 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
   3 #include <api/fs/fs.h>
   4 #include "event.h"
   5 #include "debug.h"
   6 #include "hist.h"
   7 #include "machine.h"
   8 #include "sort.h"
   9 #include "string.h"
  10 #include "strlist.h"
  11 #include "thread.h"
  12 #include "thread_map.h"
  13 #include "symbol/kallsyms.h"
  14 #include "asm/bug.h"
  15 #include "stat.h"
  16
  17 static const char *perf_event__names[] = {
  18         [0]                                     = "TOTAL",
  19         [PERF_RECORD_MMAP]                      = "MMAP",
  20         [PERF_RECORD_MMAP2]                     = "MMAP2",
  21         [PERF_RECORD_LOST]                      = "LOST",
  22         [PERF_RECORD_COMM]                      = "COMM",
  23         [PERF_RECORD_EXIT]                      = "EXIT",
  24         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  25         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  26         [PERF_RECORD_FORK]                      = "FORK",
  27         [PERF_RECORD_READ]                      = "READ",
  28         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  29         [PERF_RECORD_AUX]                       = "AUX",
  30         [PERF_RECORD_ITRACE_START]              = "ITRACE_START",
  31         [PERF_RECORD_LOST_SAMPLES]              = "LOST_SAMPLES",
  32         [PERF_RECORD_SWITCH]                    = "SWITCH",
  33         [PERF_RECORD_SWITCH_CPU_WIDE]           = "SWITCH_CPU_WIDE",
  34         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  35         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  36         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  37         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  38         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  39         [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
  40         [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
  41         [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
  42         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
  43         [PERF_RECORD_THREAD_MAP]                = "THREAD_MAP",
  44         [PERF_RECORD_CPU_MAP]                   = "CPU_MAP",
  45         [PERF_RECORD_STAT_CONFIG]               = "STAT_CONFIG",
  46         [PERF_RECORD_STAT]                      = "STAT",
  47         [PERF_RECORD_STAT_ROUND]                = "STAT_ROUND",
  48         [PERF_RECORD_EVENT_UPDATE]              = "EVENT_UPDATE",
  49         [PERF_RECORD_TIME_CONV]                 = "TIME_CONV",
  50 };
  51
  52 const char *perf_event__name(unsigned int id)
  53 {
  54         if (id >= ARRAY_SIZE(perf_event__names))
  55                 return "INVALID";
  56         if (!perf_event__names[id])
  57                 return "UNKNOWN";
  58         return perf_event__names[id];
  59 }
  60
  61 static int perf_tool__process_synth_event(struct perf_tool *tool,
  62                                           union perf_event *event,
  63                                           struct machine *machine,
  64                                           perf_event__handler_t process)
  65 {
  66         struct perf_sample synth_sample = {
  67         .pid       = -1,
  68         .tid       = -1,
  69         .time      = -1,
  70         .stream_id = -1,
  71         .cpu       = -1,
  72         .period    = 1,
  73         .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
  74         };
  75
  76         return process(tool, event, &synth_sample, machine);
  77 };
  78
  79 /*
  80  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  81  * the comm, tgid and ppid.
  82  */
  83 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
  84                                     pid_t *tgid, pid_t *ppid)
  85 {
  86         char filename[PATH_MAX];
  87         char bf[4096];
  88         int fd;
  89         size_t size = 0;
  90         ssize_t n;
  91         char *nl, *name, *tgids, *ppids;
  92
  93         *tgid = -1;
  94         *ppid = -1;
  95
  96         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  97
  98         fd = open(filename, O_RDONLY);
  99         if (fd < 0) {
 100                 pr_debug("couldn't open %s\n", filename);
 101                 return -1;
 102         }
 103
 104         n = read(fd, bf, sizeof(bf) - 1);
 105         close(fd);
 106         if (n <= 0) {
 107                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
 108                            pid);
 109                 return -1;
 110         }
 111         bf[n] = '\0';
 112
 113         name = strstr(bf, "Name:");
 114         tgids = strstr(bf, "Tgid:");
 115         ppids = strstr(bf, "PPid:");
 116
 117         if (name) {
 118                 name += 5;  /* strlen("Name:") */
 119
 120                 while (*name && isspace(*name))
 121                         ++name;
 122
 123                 nl = strchr(name, '\n');
 124                 if (nl)
 125                         *nl = '\0';
 126
 127                 size = strlen(name);
 128                 if (size >= len)
 129                         size = len - 1;
 130                 memcpy(comm, name, size);
 131                 comm[size] = '\0';
 132         } else {
 133                 pr_debug("Name: string not found for pid %d\n", pid);
 134         }
 135
 136         if (tgids) {
 137                 tgids += 5;  /* strlen("Tgid:") */
 138                 *tgid = atoi(tgids);
 139         } else {
 140                 pr_debug("Tgid: string not found for pid %d\n", pid);
 141         }
 142
 143         if (ppids) {
 144                 ppids += 5;  /* strlen("PPid:") */
 145                 *ppid = atoi(ppids);
 146         } else {
 147                 pr_debug("PPid: string not found for pid %d\n", pid);
 148         }
 149
 150         return 0;
 151 }
 152
 153 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
 154                                     struct machine *machine,
 155                                     pid_t *tgid, pid_t *ppid)
 156 {
 157         size_t size;
 158
 159         *ppid = -1;
 160
 161         memset(&event->comm, 0, sizeof(event->comm));
 162
 163         if (machine__is_host(machine)) {
 164                 if (perf_event__get_comm_ids(pid, event->comm.comm,
 165                                              sizeof(event->comm.comm),
 166                                              tgid, ppid) != 0) {
 167                         return -1;
 168                 }
 169         } else {
 170                 *tgid = machine->pid;
 171         }
 172
 173         if (*tgid < 0)
 174                 return -1;
 175
 176         event->comm.pid = *tgid;
 177         event->comm.header.type = PERF_RECORD_COMM;
 178
 179         size = strlen(event->comm.comm) + 1;
 180         size = PERF_ALIGN(size, sizeof(u64));
 181         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 182         event->comm.header.size = (sizeof(event->comm) -
 183                                 (sizeof(event->comm.comm) - size) +
 184                                 machine->id_hdr_size);
 185         event->comm.tid = pid;
 186
 187         return 0;
 188 }
 189
 190 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 191                                          union perf_event *event, pid_t pid,
 192                                          perf_event__handler_t process,
 193                                          struct machine *machine)
 194 {
 195         pid_t tgid, ppid;
 196
 197         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
 198                 return -1;
 199
 200         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 201                 return -1;
 202
 203         return tgid;
 204 }
 205
 206 static int perf_event__synthesize_fork(struct perf_tool *tool,
 207                                        union perf_event *event,
 208                                        pid_t pid, pid_t tgid, pid_t ppid,
 209                                        perf_event__handler_t process,
 210                                        struct machine *machine)
 211 {
 212         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 213
 214         /*
 215          * for main thread set parent to ppid from status file. For other
 216          * threads set parent pid to main thread. ie., assume main thread
 217          * spawns all threads in a process
 218         */
 219         if (tgid == pid) {
 220                 event->fork.ppid = ppid;
 221                 event->fork.ptid = ppid;
 222         } else {
 223                 event->fork.ppid = tgid;
 224                 event->fork.ptid = tgid;
 225         }
 226         event->fork.pid  = tgid;
 227         event->fork.tid  = pid;
 228         event->fork.header.type = PERF_RECORD_FORK;
 229
 230         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 231
 232         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 233                 return -1;
 234
 235         return 0;
 236 }
 237
 238 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 239                                        union perf_event *event,
 240                                        pid_t pid, pid_t tgid,
 241                                        perf_event__handler_t process,
 242                                        struct machine *machine,
 243                                        bool mmap_data,
 244                                        unsigned int proc_map_timeout)
 245 {
 246         char filename[PATH_MAX];
 247         FILE *fp;
 248         unsigned long long t;
 249         bool truncation = false;
 250         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 251         int rc = 0;
 252         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 253         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 254
 255         if (machine__is_default_guest(machine))
 256                 return 0;
 257
 258         snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
 259                  machine->root_dir, pid, pid);
 260
 261         fp = fopen(filename, "r");
 262         if (fp == NULL) {
 263                 /*
 264                  * We raced with a task exiting - just return:
 265                  */
 266                 pr_debug("couldn't open %s\n", filename);
 267                 return -1;
 268         }
 269
 270         event->header.type = PERF_RECORD_MMAP2;
 271         t = rdclock();
 272
 273         while (1) {
 274                 char bf[BUFSIZ];
 275                 char prot[5];
 276                 char execname[PATH_MAX];
 277                 char anonstr[] = "//anon";
 278                 unsigned int ino;
 279                 size_t size;
 280                 ssize_t n;
 281
 282                 if (fgets(bf, sizeof(bf), fp) == NULL)
 283                         break;
 284
 285                 if ((rdclock() - t) > timeout) {
 286                         pr_warning("Reading %s time out. "
 287                                    "You may want to increase "
 288                                    "the time limit by --proc-map-timeout\n",
 289                                    filename);
 290                         truncation = true;
 291                         goto out;
 292                 }
 293
 294                 /* ensure null termination since stack will be reused. */
 295                 strcpy(execname, "");
 296
 297                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 298                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
 299                        &event->mmap2.start, &event->mmap2.len, prot,
 300                        &event->mmap2.pgoff, &event->mmap2.maj,
 301                        &event->mmap2.min,
 302                        &ino, execname);
 303
 304                 /*
 305                  * Anon maps don't have the execname.
 306                  */
 307                 if (n < 7)
 308                         continue;
 309
 310                 event->mmap2.ino = (u64)ino;
 311
 312                 /*
 313                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 314                  */
 315                 if (machine__is_host(machine))
 316                         event->header.misc = PERF_RECORD_MISC_USER;
 317                 else
 318                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 319
 320                 /* map protection and flags bits */
 321                 event->mmap2.prot = 0;
 322                 event->mmap2.flags = 0;
 323                 if (prot[0] == 'r')
 324                         event->mmap2.prot |= PROT_READ;
 325                 if (prot[1] == 'w')
 326                         event->mmap2.prot |= PROT_WRITE;
 327                 if (prot[2] == 'x')
 328                         event->mmap2.prot |= PROT_EXEC;
 329
 330                 if (prot[3] == 's')
 331                         event->mmap2.flags |= MAP_SHARED;
 332                 else
 333                         event->mmap2.flags |= MAP_PRIVATE;
 334
 335                 if (prot[2] != 'x') {
 336                         if (!mmap_data || prot[0] != 'r')
 337                                 continue;
 338
 339                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 340                 }
 341
 342 out:
 343                 if (truncation)
 344                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 345
 346                 if (!strcmp(execname, ""))
 347                         strcpy(execname, anonstr);
 348
 349                 if (hugetlbfs_mnt_len &&
 350                     !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
 351                         strcpy(execname, anonstr);
 352                         event->mmap2.flags |= MAP_HUGETLB;
 353                 }
 354
 355                 size = strlen(execname) + 1;
 356                 memcpy(event->mmap2.filename, execname, size);
 357                 size = PERF_ALIGN(size, sizeof(u64));
 358                 event->mmap2.len -= event->mmap.start;
 359                 event->mmap2.header.size = (sizeof(event->mmap2) -
 360                                         (sizeof(event->mmap2.filename) - size));
 361                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 362                 event->mmap2.header.size += machine->id_hdr_size;
 363                 event->mmap2.pid = tgid;
 364                 event->mmap2.tid = pid;
 365
 366                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 367                         rc = -1;
 368                         break;
 369                 }
 370
 371                 if (truncation)
 372                         break;
 373         }
 374
 375         fclose(fp);
 376         return rc;
 377 }
 378
 379 int perf_event__synthesize_modules(struct perf_tool *tool,
 380                                    perf_event__handler_t process,
 381                                    struct machine *machine)
 382 {
 383         int rc = 0;
 384         struct map *pos;
 385         struct map_groups *kmaps = &machine->kmaps;
 386         struct maps *maps = &kmaps->maps[MAP__FUNCTION];
 387         union perf_event *event = zalloc((sizeof(event->mmap) +
 388                                           machine->id_hdr_size));
 389         if (event == NULL) {
 390                 pr_debug("Not enough memory synthesizing mmap event "
 391                          "for kernel modules\n");
 392                 return -1;
 393         }
 394
 395         event->header.type = PERF_RECORD_MMAP;
 396
 397         /*
 398          * kernel uses 0 for user space maps, see kernel/perf_event.c
 399          * __perf_event_mmap
 400          */
 401         if (machine__is_host(machine))
 402                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 403         else
 404                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 405
 406         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 407                 size_t size;
 408
 409                 if (__map__is_kernel(pos))
 410                         continue;
 411
 412                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 413                 event->mmap.header.type = PERF_RECORD_MMAP;
 414                 event->mmap.header.size = (sizeof(event->mmap) -
 415                                         (sizeof(event->mmap.filename) - size));
 416                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 417                 event->mmap.header.size += machine->id_hdr_size;
 418                 event->mmap.start = pos->start;
 419                 event->mmap.len   = pos->end - pos->start;
 420                 event->mmap.pid   = machine->pid;
 421
 422                 memcpy(event->mmap.filename, pos->dso->long_name,
 423                        pos->dso->long_name_len + 1);
 424                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 425                         rc = -1;
 426                         break;
 427                 }
 428         }
 429
 430         free(event);
 431         return rc;
 432 }
 433
 434 static int __event__synthesize_thread(union perf_event *comm_event,
 435                                       union perf_event *mmap_event,
 436                                       union perf_event *fork_event,
 437                                       pid_t pid, int full,
 438                                           perf_event__handler_t process,
 439                                       struct perf_tool *tool,
 440                                       struct machine *machine,
 441                                       bool mmap_data,
 442                                       unsigned int proc_map_timeout)
 443 {
 444         char filename[PATH_MAX];
 445         DIR *tasks;
 446         struct dirent *dirent;
 447         pid_t tgid, ppid;
 448         int rc = 0;
 449
 450         /* special case: only send one comm event using passed in pid */
 451         if (!full) {
 452                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 453                                                    process, machine);
 454
 455                 if (tgid == -1)
 456                         return -1;
 457
 458                 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 459                                                           process, machine, mmap_data,
 460                                                           proc_map_timeout);
 461         }
 462
 463         if (machine__is_default_guest(machine))
 464                 return 0;
 465
 466         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 467                  machine->root_dir, pid);
 468
 469         tasks = opendir(filename);
 470         if (tasks == NULL) {
 471                 pr_debug("couldn't open %s\n", filename);
 472                 return 0;
 473         }
 474
 475         while ((dirent = readdir(tasks)) != NULL) {
 476                 char *end;
 477                 pid_t _pid;
 478
 479                 _pid = strtol(dirent->d_name, &end, 10);
 480                 if (*end)
 481                         continue;
 482
 483                 rc = -1;
 484                 if (perf_event__prepare_comm(comm_event, _pid, machine,
 485                                              &tgid, &ppid) != 0)
 486                         break;
 487
 488                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 489                                                 ppid, process, machine) < 0)
 490                         break;
 491                 /*
 492                  * Send the prepared comm event
 493                  */
 494                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 495                         break;
 496
 497                 rc = 0;
 498                 if (_pid == pid) {
 499                         /* process the parent's maps too */
 500                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 501                                                 process, machine, mmap_data, proc_map_timeout);
 502                         if (rc)
 503                                 break;
 504                 }
 505         }
 506
 507         closedir(tasks);
 508         return rc;
 509 }
 510
 511 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 512                                       struct thread_map *threads,
 513                                       perf_event__handler_t process,
 514                                       struct machine *machine,
 515                                       bool mmap_data,
 516                                       unsigned int proc_map_timeout)
 517 {
 518         union perf_event *comm_event, *mmap_event, *fork_event;
 519         int err = -1, thread, j;
 520
 521         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 522         if (comm_event == NULL)
 523                 goto out;
 524
 525         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 526         if (mmap_event == NULL)
 527                 goto out_free_comm;
 528
 529         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 530         if (fork_event == NULL)
 531                 goto out_free_mmap;
 532
 533         err = 0;
 534         for (thread = 0; thread < threads->nr; ++thread) {
 535                 if (__event__synthesize_thread(comm_event, mmap_event,
 536                                                fork_event,
 537                                                thread_map__pid(threads, thread), 0,
 538                                                process, tool, machine,
 539                                                mmap_data, proc_map_timeout)) {
 540                         err = -1;
 541                         break;
 542                 }
 543
 544                 /*
 545                  * comm.pid is set to thread group id by
 546                  * perf_event__synthesize_comm
 547                  */
 548                 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
 549                         bool need_leader = true;
 550
 551                         /* is thread group leader in thread_map? */
 552                         for (j = 0; j < threads->nr; ++j) {
 553                                 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
 554                                         need_leader = false;
 555                                         break;
 556                                 }
 557                         }
 558
 559                         /* if not, generate events for it */
 560                         if (need_leader &&
 561                             __event__synthesize_thread(comm_event, mmap_event,
 562                                                        fork_event,
 563                                                        comm_event->comm.pid, 0,
 564                                                        process, tool, machine,
 565                                                        mmap_data, proc_map_timeout)) {
 566                                 err = -1;
 567                                 break;
 568                         }
 569                 }
 570         }
 571         free(fork_event);
 572 out_free_mmap:
 573         free(mmap_event);
 574 out_free_comm:
 575         free(comm_event);
 576 out:
 577         return err;
 578 }
 579
 580 int perf_event__synthesize_threads(struct perf_tool *tool,
 581                                    perf_event__handler_t process,
 582                                    struct machine *machine,
 583                                    bool mmap_data,
 584                                    unsigned int proc_map_timeout)
 585 {
 586         DIR *proc;
 587         char proc_path[PATH_MAX];
 588         struct dirent *dirent;
 589         union perf_event *comm_event, *mmap_event, *fork_event;
 590         int err = -1;
 591
 592         if (machine__is_default_guest(machine))
 593                 return 0;
 594
 595         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 596         if (comm_event == NULL)
 597                 goto out;
 598
 599         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 600         if (mmap_event == NULL)
 601                 goto out_free_comm;
 602
 603         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 604         if (fork_event == NULL)
 605                 goto out_free_mmap;
 606
 607         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 608         proc = opendir(proc_path);
 609
 610         if (proc == NULL)
 611                 goto out_free_fork;
 612
 613         while ((dirent = readdir(proc)) != NULL) {
 614                 char *end;
 615                 pid_t pid = strtol(dirent->d_name, &end, 10);
 616
 617                 if (*end) /* only interested in proper numerical dirents */
 618                         continue;
 619                 /*
 620                  * We may race with exiting thread, so don't stop just because
 621                  * one thread couldn't be synthesized.
 622                  */
 623                 __event__synthesize_thread(comm_event, mmap_event, fork_event, pid,
 624                                            1, process, tool, machine, mmap_data,
 625                                            proc_map_timeout);
 626         }
 627
 628         err = 0;
 629         closedir(proc);
 630 out_free_fork:
 631         free(fork_event);
 632 out_free_mmap:
 633         free(mmap_event);
 634 out_free_comm:
 635         free(comm_event);
 636 out:
 637         return err;
 638 }
 639
 640 struct process_symbol_args {
 641         const char *name;
 642         u64        start;
 643 };
 644
 645 static int find_symbol_cb(void *arg, const char *name, char type,
 646                           u64 start)
 647 {
 648         struct process_symbol_args *args = arg;
 649
 650         /*
 651          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 652          * an 'A' to the same address as "_stext".
 653          */
 654         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 655               type == 'A') || strcmp(name, args->name))
 656                 return 0;
 657
 658         args->start = start;
 659         return 1;
 660 }
 661
 662 u64 kallsyms__get_function_start(const char *kallsyms_filename,
 663                                  const char *symbol_name)
 664 {
 665         struct process_symbol_args args = { .name = symbol_name, };
 666
 667         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
 668                 return 0;
 669
 670         return args.start;
 671 }
 672
 673 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 674                                        perf_event__handler_t process,
 675                                        struct machine *machine)
 676 {
 677         size_t size;
 678         const char *mmap_name;
 679         char name_buff[PATH_MAX];
 680         struct map *map = machine__kernel_map(machine);
 681         struct kmap *kmap;
 682         int err;
 683         union perf_event *event;
 684
 685         if (map == NULL)
 686                 return -1;
 687
 688         kmap = map__kmap(map);
 689         if (!kmap->ref_reloc_sym)
 690                 return -1;
 691
 692         /*
 693          * We should get this from /sys/kernel/sections/.text, but till that is
 694          * available use this, and after it is use this as a fallback for older
 695          * kernels.
 696          */
 697         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
 698         if (event == NULL) {
 699                 pr_debug("Not enough memory synthesizing mmap event "
 700                          "for kernel modules\n");
 701                 return -1;
 702         }
 703
 704         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 705         if (machine__is_host(machine)) {
 706                 /*
 707                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 708                  * see kernel/perf_event.c __perf_event_mmap
 709                  */
 710                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 711         } else {
 712                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 713         }
 714
 715         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 716                         "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
 717         size = PERF_ALIGN(size, sizeof(u64));
 718         event->mmap.header.type = PERF_RECORD_MMAP;
 719         event->mmap.header.size = (sizeof(event->mmap) -
 720                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 721         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 722         event->mmap.start = map->start;
 723         event->mmap.len   = map->end - event->mmap.start;
 724         event->mmap.pid   = machine->pid;
 725
 726         err = perf_tool__process_synth_event(tool, event, machine, process);
 727         free(event);
 728
 729         return err;
 730 }
 731
 732 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
 733                                       struct thread_map *threads,
 734                                       perf_event__handler_t process,
 735                                       struct machine *machine)
 736 {
 737         union perf_event *event;
 738         int i, err, size;
 739
 740         size  = sizeof(event->thread_map);
 741         size += threads->nr * sizeof(event->thread_map.entries[0]);
 742
 743         event = zalloc(size);
 744         if (!event)
 745                 return -ENOMEM;
 746
 747         event->header.type = PERF_RECORD_THREAD_MAP;
 748         event->header.size = size;
 749         event->thread_map.nr = threads->nr;
 750
 751         for (i = 0; i < threads->nr; i++) {
 752                 struct thread_map_event_entry *entry = &event->thread_map.entries[i];
 753                 char *comm = thread_map__comm(threads, i);
 754
 755                 if (!comm)
 756                         comm = (char *) "";
 757
 758                 entry->pid = thread_map__pid(threads, i);
 759                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
 760         }
 761
 762         err = process(tool, event, NULL, machine);
 763
 764         free(event);
 765         return err;
 766 }
 767
 768 static void synthesize_cpus(struct cpu_map_entries *cpus,
 769                             struct cpu_map *map)
 770 {
 771         int i;
 772
 773         cpus->nr = map->nr;
 774
 775         for (i = 0; i < map->nr; i++)
 776                 cpus->cpu[i] = map->map[i];
 777 }
 778
 779 static void synthesize_mask(struct cpu_map_mask *mask,
 780                             struct cpu_map *map, int max)
 781 {
 782         int i;
 783
 784         mask->nr = BITS_TO_LONGS(max);
 785         mask->long_size = sizeof(long);
 786
 787         for (i = 0; i < map->nr; i++)
 788                 set_bit(map->map[i], mask->mask);
 789 }
 790
 791 static size_t cpus_size(struct cpu_map *map)
 792 {
 793         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
 794 }
 795
 796 static size_t mask_size(struct cpu_map *map, int *max)
 797 {
 798         int i;
 799
 800         *max = 0;
 801
 802         for (i = 0; i < map->nr; i++) {
 803                 /* bit possition of the cpu is + 1 */
 804                 int bit = map->map[i] + 1;
 805
 806                 if (bit > *max)
 807                         *max = bit;
 808         }
 809
 810         return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
 811 }
 812
 813 void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
 814 {
 815         size_t size_cpus, size_mask;
 816         bool is_dummy = cpu_map__empty(map);
 817
 818         /*
 819          * Both array and mask data have variable size based
 820          * on the number of cpus and their actual values.
 821          * The size of the 'struct cpu_map_data' is:
 822          *
 823          *   array = size of 'struct cpu_map_entries' +
 824          *           number of cpus * sizeof(u64)
 825          *
 826          *   mask  = size of 'struct cpu_map_mask' +
 827          *           maximum cpu bit converted to size of longs
 828          *
 829          * and finaly + the size of 'struct cpu_map_data'.
 830          */
 831         size_cpus = cpus_size(map);
 832         size_mask = mask_size(map, max);
 833
 834         if (is_dummy || (size_cpus < size_mask)) {
 835                 *size += size_cpus;
 836                 *type  = PERF_CPU_MAP__CPUS;
 837         } else {
 838                 *size += size_mask;
 839                 *type  = PERF_CPU_MAP__MASK;
 840         }
 841
 842         *size += sizeof(struct cpu_map_data);
 843         *size = PERF_ALIGN(*size, sizeof(u64));
 844         return zalloc(*size);
 845 }
 846
 847 void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
 848                               u16 type, int max)
 849 {
 850         data->type = type;
 851
 852         switch (type) {
 853         case PERF_CPU_MAP__CPUS:
 854                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
 855                 break;
 856         case PERF_CPU_MAP__MASK:
 857                 synthesize_mask((struct cpu_map_mask *) data->data, map, max);
 858         default:
 859                 break;
 860         };
 861 }
 862
 863 static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
 864 {
 865         size_t size = sizeof(struct cpu_map_event);
 866         struct cpu_map_event *event;
 867         int max;
 868         u16 type;
 869
 870         event = cpu_map_data__alloc(map, &size, &type, &max);
 871         if (!event)
 872                 return NULL;
 873
 874         event->header.type = PERF_RECORD_CPU_MAP;
 875         event->header.size = size;
 876         event->data.type   = type;
 877
 878         cpu_map_data__synthesize(&event->data, map, type, max);
 879         return event;
 880 }
 881
 882 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
 883                                    struct cpu_map *map,
 884                                    perf_event__handler_t process,
 885                                    struct machine *machine)
 886 {
 887         struct cpu_map_event *event;
 888         int err;
 889
 890         event = cpu_map_event__new(map);
 891         if (!event)
 892                 return -ENOMEM;
 893
 894         err = process(tool, (union perf_event *) event, NULL, machine);
 895
 896         free(event);
 897         return err;
 898 }
 899
 900 int perf_event__synthesize_stat_config(struct perf_tool *tool,
 901                                        struct perf_stat_config *config,
 902                                        perf_event__handler_t process,
 903                                        struct machine *machine)
 904 {
 905         struct stat_config_event *event;
 906         int size, i = 0, err;
 907
 908         size  = sizeof(*event);
 909         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
 910
 911         event = zalloc(size);
 912         if (!event)
 913                 return -ENOMEM;
 914
 915         event->header.type = PERF_RECORD_STAT_CONFIG;
 916         event->header.size = size;
 917         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
 918
 919 #define ADD(__term, __val)                                      \
 920         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
 921         event->data[i].val = __val;                             \
 922         i++;
 923
 924         ADD(AGGR_MODE,  config->aggr_mode)
 925         ADD(INTERVAL,   config->interval)
 926         ADD(SCALE,      config->scale)
 927
 928         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
 929                   "stat config terms unbalanced\n");
 930 #undef ADD
 931
 932         err = process(tool, (union perf_event *) event, NULL, machine);
 933
 934         free(event);
 935         return err;
 936 }
 937
 938 int perf_event__synthesize_stat(struct perf_tool *tool,
 939                                 u32 cpu, u32 thread, u64 id,
 940                                 struct perf_counts_values *count,
 941                                 perf_event__handler_t process,
 942                                 struct machine *machine)
 943 {
 944         struct stat_event event;
 945
 946         event.header.type = PERF_RECORD_STAT;
 947         event.header.size = sizeof(event);
 948         event.header.misc = 0;
 949
 950         event.id        = id;
 951         event.cpu       = cpu;
 952         event.thread    = thread;
 953         event.val       = count->val;
 954         event.ena       = count->ena;
 955         event.run       = count->run;
 956
 957         return process(tool, (union perf_event *) &event, NULL, machine);
 958 }
 959
 960 int perf_event__synthesize_stat_round(struct perf_tool *tool,
 961                                       u64 evtime, u64 type,
 962                                       perf_event__handler_t process,
 963                                       struct machine *machine)
 964 {
 965         struct stat_round_event event;
 966
 967         event.header.type = PERF_RECORD_STAT_ROUND;
 968         event.header.size = sizeof(event);
 969         event.header.misc = 0;
 970
 971         event.time = evtime;
 972         event.type = type;
 973
 974         return process(tool, (union perf_event *) &event, NULL, machine);
 975 }
 976
 977 void perf_event__read_stat_config(struct perf_stat_config *config,
 978                                   struct stat_config_event *event)
 979 {
 980         unsigned i;
 981
 982         for (i = 0; i < event->nr; i++) {
 983
 984                 switch (event->data[i].tag) {
 985 #define CASE(__term, __val)                                     \
 986                 case PERF_STAT_CONFIG_TERM__##__term:           \
 987                         config->__val = event->data[i].val;     \
 988                         break;
 989
 990                 CASE(AGGR_MODE, aggr_mode)
 991                 CASE(SCALE,     scale)
 992                 CASE(INTERVAL,  interval)
 993 #undef CASE
 994                 default:
 995                         pr_warning("unknown stat config term %" PRIu64 "\n",
 996                                    event->data[i].tag);
 997                 }
 998         }
 999 }
1000
1001 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
1002 {
1003         const char *s;
1004
1005         if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
1006                 s = " exec";
1007         else
1008                 s = "";
1009
1010         return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
1011 }
1012
1013 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
1014                              union perf_event *event,
1015                              struct perf_sample *sample,
1016                              struct machine *machine)
1017 {
1018         return machine__process_comm_event(machine, event, sample);
1019 }
1020
1021 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
1022                              union perf_event *event,
1023                              struct perf_sample *sample,
1024                              struct machine *machine)
1025 {
1026         return machine__process_lost_event(machine, event, sample);
1027 }
1028
1029 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
1030                             union perf_event *event,
1031                             struct perf_sample *sample __maybe_unused,
1032                             struct machine *machine)
1033 {
1034         return machine__process_aux_event(machine, event);
1035 }
1036
1037 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
1038                                      union perf_event *event,
1039                                      struct perf_sample *sample __maybe_unused,
1040                                      struct machine *machine)
1041 {
1042         return machine__process_itrace_start_event(machine, event);
1043 }
1044
1045 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
1046                                      union perf_event *event,
1047                                      struct perf_sample *sample,
1048                                      struct machine *machine)
1049 {
1050         return machine__process_lost_samples_event(machine, event, sample);
1051 }
1052
1053 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
1054                                union perf_event *event,
1055                                struct perf_sample *sample __maybe_unused,
1056                                struct machine *machine)
1057 {
1058         return machine__process_switch_event(machine, event);
1059 }
1060
1061 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
1062 {
1063         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
1064                        event->mmap.pid, event->mmap.tid, event->mmap.start,
1065                        event->mmap.len, event->mmap.pgoff,
1066                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
1067                        event->mmap.filename);
1068 }
1069
1070 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
1071 {
1072         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
1073                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
1074                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
1075                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
1076                        event->mmap2.min, event->mmap2.ino,
1077                        event->mmap2.ino_generation,
1078                        (event->mmap2.prot & PROT_READ) ? 'r' : '-',
1079                        (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
1080                        (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
1081                        (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
1082                        event->mmap2.filename);
1083 }
1084
1085 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
1086 {
1087         struct thread_map *threads = thread_map__new_event(&event->thread_map);
1088         size_t ret;
1089
1090         ret = fprintf(fp, " nr: ");
1091
1092         if (threads)
1093                 ret += thread_map__fprintf(threads, fp);
1094         else
1095                 ret += fprintf(fp, "failed to get threads from event\n");
1096
1097         thread_map__put(threads);
1098         return ret;
1099 }
1100
1101 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
1102 {
1103         struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
1104         size_t ret;
1105
1106         ret = fprintf(fp, ": ");
1107
1108         if (cpus)
1109                 ret += cpu_map__fprintf(cpus, fp);
1110         else
1111                 ret += fprintf(fp, "failed to get cpumap from event\n");
1112
1113         cpu_map__put(cpus);
1114         return ret;
1115 }
1116
1117 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
1118                              union perf_event *event,
1119                              struct perf_sample *sample,
1120                              struct machine *machine)
1121 {
1122         return machine__process_mmap_event(machine, event, sample);
1123 }
1124
1125 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
1126                              union perf_event *event,
1127                              struct perf_sample *sample,
1128                              struct machine *machine)
1129 {
1130         return machine__process_mmap2_event(machine, event, sample);
1131 }
1132
1133 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
1134 {
1135         return fprintf(fp, "(%d:%d):(%d:%d)\n",
1136                        event->fork.pid, event->fork.tid,
1137                        event->fork.ppid, event->fork.ptid);
1138 }
1139
1140 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
1141                              union perf_event *event,
1142                              struct perf_sample *sample,
1143                              struct machine *machine)
1144 {
1145         return machine__process_fork_event(machine, event, sample);
1146 }
1147
1148 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
1149                              union perf_event *event,
1150                              struct perf_sample *sample,
1151                              struct machine *machine)
1152 {
1153         return machine__process_exit_event(machine, event, sample);
1154 }
1155
1156 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
1157 {
1158         return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s]\n",
1159                        event->aux.aux_offset, event->aux.aux_size,
1160                        event->aux.flags,
1161                        event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
1162                        event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "");
1163 }
1164
1165 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
1166 {
1167         return fprintf(fp, " pid: %u tid: %u\n",
1168                        event->itrace_start.pid, event->itrace_start.tid);
1169 }
1170
1171 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
1172 {
1173         bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
1174         const char *in_out = out ? "OUT" : "IN ";
1175
1176         if (event->header.type == PERF_RECORD_SWITCH)
1177                 return fprintf(fp, " %s\n", in_out);
1178
1179         return fprintf(fp, " %s  %s pid/tid: %5u/%-5u\n",
1180                        in_out, out ? "next" : "prev",
1181                        event->context_switch.next_prev_pid,
1182                        event->context_switch.next_prev_tid);
1183 }
1184
1185 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
1186 {
1187         size_t ret = fprintf(fp, "PERF_RECORD_%s",
1188                              perf_event__name(event->header.type));
1189
1190         switch (event->header.type) {
1191         case PERF_RECORD_COMM:
1192                 ret += perf_event__fprintf_comm(event, fp);
1193                 break;
1194         case PERF_RECORD_FORK:
1195         case PERF_RECORD_EXIT:
1196                 ret += perf_event__fprintf_task(event, fp);
1197                 break;
1198         case PERF_RECORD_MMAP:
1199                 ret += perf_event__fprintf_mmap(event, fp);
1200                 break;
1201         case PERF_RECORD_MMAP2:
1202                 ret += perf_event__fprintf_mmap2(event, fp);
1203                 break;
1204         case PERF_RECORD_AUX:
1205                 ret += perf_event__fprintf_aux(event, fp);
1206                 break;
1207         case PERF_RECORD_ITRACE_START:
1208                 ret += perf_event__fprintf_itrace_start(event, fp);
1209                 break;
1210         case PERF_RECORD_SWITCH:
1211         case PERF_RECORD_SWITCH_CPU_WIDE:
1212                 ret += perf_event__fprintf_switch(event, fp);
1213                 break;
1214         default:
1215                 ret += fprintf(fp, "\n");
1216         }
1217
1218         return ret;
1219 }
1220
1221 int perf_event__process(struct perf_tool *tool __maybe_unused,
1222                         union perf_event *event,
1223                         struct perf_sample *sample,
1224                         struct machine *machine)
1225 {
1226         return machine__process_event(machine, event, sample);
1227 }
1228
1229 void thread__find_addr_map(struct thread *thread, u8 cpumode,
1230                            enum map_type type, u64 addr,
1231                            struct addr_location *al)
1232 {
1233         struct map_groups *mg = thread->mg;
1234         struct machine *machine = mg->machine;
1235         bool load_map = false;
1236
1237         al->machine = machine;
1238         al->thread = thread;
1239         al->addr = addr;
1240         al->cpumode = cpumode;
1241         al->filtered = 0;
1242
1243         if (machine == NULL) {
1244                 al->map = NULL;
1245                 return;
1246         }
1247
1248         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
1249                 al->level = 'k';
1250                 mg = &machine->kmaps;
1251                 load_map = true;
1252         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
1253                 al->level = '.';
1254         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
1255                 al->level = 'g';
1256                 mg = &machine->kmaps;
1257                 load_map = true;
1258         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
1259                 al->level = 'u';
1260         } else {
1261                 al->level = 'H';
1262                 al->map = NULL;
1263
1264                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
1265                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
1266                         !perf_guest)
1267                         al->filtered |= (1 << HIST_FILTER__GUEST);
1268                 if ((cpumode == PERF_RECORD_MISC_USER ||
1269                         cpumode == PERF_RECORD_MISC_KERNEL) &&
1270                         !perf_host)
1271                         al->filtered |= (1 << HIST_FILTER__HOST);
1272
1273                 return;
1274         }
1275 try_again:
1276         al->map = map_groups__find(mg, type, al->addr);
1277         if (al->map == NULL) {
1278                 /*
1279                  * If this is outside of all known maps, and is a negative
1280                  * address, try to look it up in the kernel dso, as it might be
1281                  * a vsyscall or vdso (which executes in user-mode).
1282                  *
1283                  * XXX This is nasty, we should have a symbol list in the
1284                  * "[vdso]" dso, but for now lets use the old trick of looking
1285                  * in the whole kernel symbol list.
1286                  */
1287                 if (cpumode == PERF_RECORD_MISC_USER && machine &&
1288                     mg != &machine->kmaps &&
1289                     machine__kernel_ip(machine, al->addr)) {
1290                         mg = &machine->kmaps;
1291                         load_map = true;
1292                         goto try_again;
1293                 }
1294         } else {
1295                 /*
1296                  * Kernel maps might be changed when loading symbols so loading
1297                  * must be done prior to using kernel maps.
1298                  */
1299                 if (load_map)
1300                         map__load(al->map);
1301                 al->addr = al->map->map_ip(al->map, al->addr);
1302         }
1303 }
1304
1305 void thread__find_addr_location(struct thread *thread,
1306                                 u8 cpumode, enum map_type type, u64 addr,
1307                                 struct addr_location *al)
1308 {
1309         thread__find_addr_map(thread, cpumode, type, addr, al);
1310         if (al->map != NULL)
1311                 al->sym = map__find_symbol(al->map, al->addr);
1312         else
1313                 al->sym = NULL;
1314 }
1315
1316 /*
1317  * Callers need to drop the reference to al->thread, obtained in
1318  * machine__findnew_thread()
1319  */
1320 int machine__resolve(struct machine *machine, struct addr_location *al,
1321                      struct perf_sample *sample)
1322 {
1323         struct thread *thread = machine__findnew_thread(machine, sample->pid,
1324                                                         sample->tid);
1325
1326         if (thread == NULL)
1327                 return -1;
1328
1329         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1330         /*
1331          * Have we already created the kernel maps for this machine?
1332          *
1333          * This should have happened earlier, when we processed the kernel MMAP
1334          * events, but for older perf.data files there was no such thing, so do
1335          * it now.
1336          */
1337         if (sample->cpumode == PERF_RECORD_MISC_KERNEL &&
1338             machine__kernel_map(machine) == NULL)
1339                 machine__create_kernel_maps(machine);
1340
1341         thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, al);
1342         dump_printf(" ...... dso: %s\n",
1343                     al->map ? al->map->dso->long_name :
1344                         al->level == 'H' ? "[hypervisor]" : "<not found>");
1345
1346         if (thread__is_filtered(thread))
1347                 al->filtered |= (1 << HIST_FILTER__THREAD);
1348
1349         al->sym = NULL;
1350         al->cpu = sample->cpu;
1351         al->socket = -1;
1352
1353         if (al->cpu >= 0) {
1354                 struct perf_env *env = machine->env;
1355
1356                 if (env && env->cpu)
1357                         al->socket = env->cpu[al->cpu].socket_id;
1358         }
1359
1360         if (al->map) {
1361                 struct dso *dso = al->map->dso;
1362
1363                 if (symbol_conf.dso_list &&
1364                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1365                                                   dso->short_name) ||
1366                                (dso->short_name != dso->long_name &&
1367                                 strlist__has_entry(symbol_conf.dso_list,
1368                                                    dso->long_name))))) {
1369                         al->filtered |= (1 << HIST_FILTER__DSO);
1370                 }
1371
1372                 al->sym = map__find_symbol(al->map, al->addr);
1373         } else if (symbol_conf.dso_list) {
1374                 al->filtered |= (1 << HIST_FILTER__DSO);
1375         }
1376
1377         if (symbol_conf.sym_list &&
1378                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1379                                                 al->sym->name))) {
1380                 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1381         }
1382
1383         return 0;
1384 }
1385
1386 /*
1387  * The preprocess_sample method will return with reference counts for the
1388  * in it, when done using (and perhaps getting ref counts if needing to
1389  * keep a pointer to one of those entries) it must be paired with
1390  * addr_location__put(), so that the refcounts can be decremented.
1391  */
1392 void addr_location__put(struct addr_location *al)
1393 {
1394         thread__zput(al->thread);
1395 }
1396
1397 bool is_bts_event(struct perf_event_attr *attr)
1398 {
1399         return attr->type == PERF_TYPE_HARDWARE &&
1400                (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1401                attr->sample_period == 1;
1402 }
1403
1404 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1405 {
1406         if (attr->type == PERF_TYPE_SOFTWARE &&
1407             (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1408              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1409              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1410                 return true;
1411
1412         if (is_bts_event(attr))
1413                 return true;
1414
1415         return false;
1416 }
1417
1418 void thread__resolve(struct thread *thread, struct addr_location *al,
1419                      struct perf_sample *sample)
1420 {
1421         thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->addr, al);
1422         if (!al->map)
1423                 thread__find_addr_map(thread, sample->cpumode, MAP__VARIABLE,
1424                                       sample->addr, al);
1425
1426         al->cpu = sample->cpu;
1427         al->sym = NULL;
1428
1429         if (al->map)
1430                 al->sym = map__find_symbol(al->map, al->addr);
1431 }