tools/perf/util/event.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <dirent.h>
   3 #include <errno.h>
   4 #include <inttypes.h>
   5 #include <linux/kernel.h>
   6 #include <linux/types.h>
   7 #include <sys/types.h>
   8 #include <sys/stat.h>
   9 #include <unistd.h>
  10 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  11 #include <api/fs/fs.h>
  12 #include <linux/perf_event.h>
  13 #include "event.h"
  14 #include "debug.h"
  15 #include "hist.h"
  16 #include "machine.h"
  17 #include "sort.h"
  18 #include "string2.h"
  19 #include "strlist.h"
  20 #include "thread.h"
  21 #include "thread_map.h"
  22 #include "sane_ctype.h"
  23 #include "symbol/kallsyms.h"
  24 #include "asm/bug.h"
  25 #include "stat.h"
  26
  27 static const char *perf_event__names[] = {
  28         [0]                                     = "TOTAL",
  29         [PERF_RECORD_MMAP]                      = "MMAP",
  30         [PERF_RECORD_MMAP2]                     = "MMAP2",
  31         [PERF_RECORD_LOST]                      = "LOST",
  32         [PERF_RECORD_COMM]                      = "COMM",
  33         [PERF_RECORD_EXIT]                      = "EXIT",
  34         [PERF_RECORD_THROTTLE]                  = "THROTTLE",
  35         [PERF_RECORD_UNTHROTTLE]                = "UNTHROTTLE",
  36         [PERF_RECORD_FORK]                      = "FORK",
  37         [PERF_RECORD_READ]                      = "READ",
  38         [PERF_RECORD_SAMPLE]                    = "SAMPLE",
  39         [PERF_RECORD_AUX]                       = "AUX",
  40         [PERF_RECORD_ITRACE_START]              = "ITRACE_START",
  41         [PERF_RECORD_LOST_SAMPLES]              = "LOST_SAMPLES",
  42         [PERF_RECORD_SWITCH]                    = "SWITCH",
  43         [PERF_RECORD_SWITCH_CPU_WIDE]           = "SWITCH_CPU_WIDE",
  44         [PERF_RECORD_NAMESPACES]                = "NAMESPACES",
  45         [PERF_RECORD_HEADER_ATTR]               = "ATTR",
  46         [PERF_RECORD_HEADER_EVENT_TYPE]         = "EVENT_TYPE",
  47         [PERF_RECORD_HEADER_TRACING_DATA]       = "TRACING_DATA",
  48         [PERF_RECORD_HEADER_BUILD_ID]           = "BUILD_ID",
  49         [PERF_RECORD_FINISHED_ROUND]            = "FINISHED_ROUND",
  50         [PERF_RECORD_ID_INDEX]                  = "ID_INDEX",
  51         [PERF_RECORD_AUXTRACE_INFO]             = "AUXTRACE_INFO",
  52         [PERF_RECORD_AUXTRACE]                  = "AUXTRACE",
  53         [PERF_RECORD_AUXTRACE_ERROR]            = "AUXTRACE_ERROR",
  54         [PERF_RECORD_THREAD_MAP]                = "THREAD_MAP",
  55         [PERF_RECORD_CPU_MAP]                   = "CPU_MAP",
  56         [PERF_RECORD_STAT_CONFIG]               = "STAT_CONFIG",
  57         [PERF_RECORD_STAT]                      = "STAT",
  58         [PERF_RECORD_STAT_ROUND]                = "STAT_ROUND",
  59         [PERF_RECORD_EVENT_UPDATE]              = "EVENT_UPDATE",
  60         [PERF_RECORD_TIME_CONV]                 = "TIME_CONV",
  61         [PERF_RECORD_HEADER_FEATURE]            = "FEATURE",
  62 };
  63
  64 static const char *perf_ns__names[] = {
  65         [NET_NS_INDEX]          = "net",
  66         [UTS_NS_INDEX]          = "uts",
  67         [IPC_NS_INDEX]          = "ipc",
  68         [PID_NS_INDEX]          = "pid",
  69         [USER_NS_INDEX]         = "user",
  70         [MNT_NS_INDEX]          = "mnt",
  71         [CGROUP_NS_INDEX]       = "cgroup",
  72 };
  73
  74 const char *perf_event__name(unsigned int id)
  75 {
  76         if (id >= ARRAY_SIZE(perf_event__names))
  77                 return "INVALID";
  78         if (!perf_event__names[id])
  79                 return "UNKNOWN";
  80         return perf_event__names[id];
  81 }
  82
  83 static const char *perf_ns__name(unsigned int id)
  84 {
  85         if (id >= ARRAY_SIZE(perf_ns__names))
  86                 return "UNKNOWN";
  87         return perf_ns__names[id];
  88 }
  89
  90 static int perf_tool__process_synth_event(struct perf_tool *tool,
  91                                           union perf_event *event,
  92                                           struct machine *machine,
  93                                           perf_event__handler_t process)
  94 {
  95         struct perf_sample synth_sample = {
  96         .pid       = -1,
  97         .tid       = -1,
  98         .time      = -1,
  99         .stream_id = -1,
 100         .cpu       = -1,
 101         .period    = 1,
 102         .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
 103         };
 104
 105         return process(tool, event, &synth_sample, machine);
 106 };
 107
 108 /*
 109  * Assumes that the first 4095 bytes of /proc/pid/stat contains
 110  * the comm, tgid and ppid.
 111  */
 112 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
 113                                     pid_t *tgid, pid_t *ppid)
 114 {
 115         char filename[PATH_MAX];
 116         char bf[4096];
 117         int fd;
 118         size_t size = 0;
 119         ssize_t n;
 120         char *name, *tgids, *ppids;
 121
 122         *tgid = -1;
 123         *ppid = -1;
 124
 125         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
 126
 127         fd = open(filename, O_RDONLY);
 128         if (fd < 0) {
 129                 pr_debug("couldn't open %s\n", filename);
 130                 return -1;
 131         }
 132
 133         n = read(fd, bf, sizeof(bf) - 1);
 134         close(fd);
 135         if (n <= 0) {
 136                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
 137                            pid);
 138                 return -1;
 139         }
 140         bf[n] = '\0';
 141
 142         name = strstr(bf, "Name:");
 143         tgids = strstr(bf, "Tgid:");
 144         ppids = strstr(bf, "PPid:");
 145
 146         if (name) {
 147                 char *nl;
 148
 149                 name += 5;  /* strlen("Name:") */
 150                 name = ltrim(name);
 151
 152                 nl = strchr(name, '\n');
 153                 if (nl)
 154                         *nl = '\0';
 155
 156                 size = strlen(name);
 157                 if (size >= len)
 158                         size = len - 1;
 159                 memcpy(comm, name, size);
 160                 comm[size] = '\0';
 161         } else {
 162                 pr_debug("Name: string not found for pid %d\n", pid);
 163         }
 164
 165         if (tgids) {
 166                 tgids += 5;  /* strlen("Tgid:") */
 167                 *tgid = atoi(tgids);
 168         } else {
 169                 pr_debug("Tgid: string not found for pid %d\n", pid);
 170         }
 171
 172         if (ppids) {
 173                 ppids += 5;  /* strlen("PPid:") */
 174                 *ppid = atoi(ppids);
 175         } else {
 176                 pr_debug("PPid: string not found for pid %d\n", pid);
 177         }
 178
 179         return 0;
 180 }
 181
 182 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
 183                                     struct machine *machine,
 184                                     pid_t *tgid, pid_t *ppid)
 185 {
 186         size_t size;
 187
 188         *ppid = -1;
 189
 190         memset(&event->comm, 0, sizeof(event->comm));
 191
 192         if (machine__is_host(machine)) {
 193                 if (perf_event__get_comm_ids(pid, event->comm.comm,
 194                                              sizeof(event->comm.comm),
 195                                              tgid, ppid) != 0) {
 196                         return -1;
 197                 }
 198         } else {
 199                 *tgid = machine->pid;
 200         }
 201
 202         if (*tgid < 0)
 203                 return -1;
 204
 205         event->comm.pid = *tgid;
 206         event->comm.header.type = PERF_RECORD_COMM;
 207
 208         size = strlen(event->comm.comm) + 1;
 209         size = PERF_ALIGN(size, sizeof(u64));
 210         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 211         event->comm.header.size = (sizeof(event->comm) -
 212                                 (sizeof(event->comm.comm) - size) +
 213                                 machine->id_hdr_size);
 214         event->comm.tid = pid;
 215
 216         return 0;
 217 }
 218
 219 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 220                                          union perf_event *event, pid_t pid,
 221                                          perf_event__handler_t process,
 222                                          struct machine *machine)
 223 {
 224         pid_t tgid, ppid;
 225
 226         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
 227                 return -1;
 228
 229         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 230                 return -1;
 231
 232         return tgid;
 233 }
 234
 235 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
 236                                          struct perf_ns_link_info *ns_link_info)
 237 {
 238         struct stat64 st;
 239         char proc_ns[128];
 240
 241         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
 242         if (stat64(proc_ns, &st) == 0) {
 243                 ns_link_info->dev = st.st_dev;
 244                 ns_link_info->ino = st.st_ino;
 245         }
 246 }
 247
 248 int perf_event__synthesize_namespaces(struct perf_tool *tool,
 249                                       union perf_event *event,
 250                                       pid_t pid, pid_t tgid,
 251                                       perf_event__handler_t process,
 252                                       struct machine *machine)
 253 {
 254         u32 idx;
 255         struct perf_ns_link_info *ns_link_info;
 256
 257         if (!tool || !tool->namespace_events)
 258                 return 0;
 259
 260         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
 261                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 262                machine->id_hdr_size));
 263
 264         event->namespaces.pid = tgid;
 265         event->namespaces.tid = pid;
 266
 267         event->namespaces.nr_namespaces = NR_NAMESPACES;
 268
 269         ns_link_info = event->namespaces.link_info;
 270
 271         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
 272                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
 273                                              &ns_link_info[idx]);
 274
 275         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
 276
 277         event->namespaces.header.size = (sizeof(event->namespaces) +
 278                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 279                         machine->id_hdr_size);
 280
 281         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 282                 return -1;
 283
 284         return 0;
 285 }
 286
 287 static int perf_event__synthesize_fork(struct perf_tool *tool,
 288                                        union perf_event *event,
 289                                        pid_t pid, pid_t tgid, pid_t ppid,
 290                                        perf_event__handler_t process,
 291                                        struct machine *machine)
 292 {
 293         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 294
 295         /*
 296          * for main thread set parent to ppid from status file. For other
 297          * threads set parent pid to main thread. ie., assume main thread
 298          * spawns all threads in a process
 299         */
 300         if (tgid == pid) {
 301                 event->fork.ppid = ppid;
 302                 event->fork.ptid = ppid;
 303         } else {
 304                 event->fork.ppid = tgid;
 305                 event->fork.ptid = tgid;
 306         }
 307         event->fork.pid  = tgid;
 308         event->fork.tid  = pid;
 309         event->fork.header.type = PERF_RECORD_FORK;
 310
 311         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 312
 313         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 314                 return -1;
 315
 316         return 0;
 317 }
 318
 319 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 320                                        union perf_event *event,
 321                                        pid_t pid, pid_t tgid,
 322                                        perf_event__handler_t process,
 323                                        struct machine *machine,
 324                                        bool mmap_data,
 325                                        unsigned int proc_map_timeout)
 326 {
 327         char filename[PATH_MAX];
 328         FILE *fp;
 329         unsigned long long t;
 330         bool truncation = false;
 331         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 332         int rc = 0;
 333         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 334         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 335
 336         if (machine__is_default_guest(machine))
 337                 return 0;
 338
 339         snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
 340                  machine->root_dir, pid, pid);
 341
 342         fp = fopen(filename, "r");
 343         if (fp == NULL) {
 344                 /*
 345                  * We raced with a task exiting - just return:
 346                  */
 347                 pr_debug("couldn't open %s\n", filename);
 348                 return -1;
 349         }
 350
 351         event->header.type = PERF_RECORD_MMAP2;
 352         t = rdclock();
 353
 354         while (1) {
 355                 char bf[BUFSIZ];
 356                 char prot[5];
 357                 char execname[PATH_MAX];
 358                 char anonstr[] = "//anon";
 359                 unsigned int ino;
 360                 size_t size;
 361                 ssize_t n;
 362
 363                 if (fgets(bf, sizeof(bf), fp) == NULL)
 364                         break;
 365
 366                 if ((rdclock() - t) > timeout) {
 367                         pr_warning("Reading %s time out. "
 368                                    "You may want to increase "
 369                                    "the time limit by --proc-map-timeout\n",
 370                                    filename);
 371                         truncation = true;
 372                         goto out;
 373                 }
 374
 375                 /* ensure null termination since stack will be reused. */
 376                 strcpy(execname, "");
 377
 378                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 379                 n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %[^\n]\n",
 380                        &event->mmap2.start, &event->mmap2.len, prot,
 381                        &event->mmap2.pgoff, &event->mmap2.maj,
 382                        &event->mmap2.min,
 383                        &ino, execname);
 384
 385                 /*
 386                  * Anon maps don't have the execname.
 387                  */
 388                 if (n < 7)
 389                         continue;
 390
 391                 event->mmap2.ino = (u64)ino;
 392
 393                 /*
 394                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 395                  */
 396                 if (machine__is_host(machine))
 397                         event->header.misc = PERF_RECORD_MISC_USER;
 398                 else
 399                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 400
 401                 /* map protection and flags bits */
 402                 event->mmap2.prot = 0;
 403                 event->mmap2.flags = 0;
 404                 if (prot[0] == 'r')
 405                         event->mmap2.prot |= PROT_READ;
 406                 if (prot[1] == 'w')
 407                         event->mmap2.prot |= PROT_WRITE;
 408                 if (prot[2] == 'x')
 409                         event->mmap2.prot |= PROT_EXEC;
 410
 411                 if (prot[3] == 's')
 412                         event->mmap2.flags |= MAP_SHARED;
 413                 else
 414                         event->mmap2.flags |= MAP_PRIVATE;
 415
 416                 if (prot[2] != 'x') {
 417                         if (!mmap_data || prot[0] != 'r')
 418                                 continue;
 419
 420                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 421                 }
 422
 423 out:
 424                 if (truncation)
 425                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 426
 427                 if (!strcmp(execname, ""))
 428                         strcpy(execname, anonstr);
 429
 430                 if (hugetlbfs_mnt_len &&
 431                     !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
 432                         strcpy(execname, anonstr);
 433                         event->mmap2.flags |= MAP_HUGETLB;
 434                 }
 435
 436                 size = strlen(execname) + 1;
 437                 memcpy(event->mmap2.filename, execname, size);
 438                 size = PERF_ALIGN(size, sizeof(u64));
 439                 event->mmap2.len -= event->mmap.start;
 440                 event->mmap2.header.size = (sizeof(event->mmap2) -
 441                                         (sizeof(event->mmap2.filename) - size));
 442                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 443                 event->mmap2.header.size += machine->id_hdr_size;
 444                 event->mmap2.pid = tgid;
 445                 event->mmap2.tid = pid;
 446
 447                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 448                         rc = -1;
 449                         break;
 450                 }
 451
 452                 if (truncation)
 453                         break;
 454         }
 455
 456         fclose(fp);
 457         return rc;
 458 }
 459
 460 int perf_event__synthesize_modules(struct perf_tool *tool,
 461                                    perf_event__handler_t process,
 462                                    struct machine *machine)
 463 {
 464         int rc = 0;
 465         struct map *pos;
 466         struct map_groups *kmaps = &machine->kmaps;
 467         struct maps *maps = &kmaps->maps[MAP__FUNCTION];
 468         union perf_event *event = zalloc((sizeof(event->mmap) +
 469                                           machine->id_hdr_size));
 470         if (event == NULL) {
 471                 pr_debug("Not enough memory synthesizing mmap event "
 472                          "for kernel modules\n");
 473                 return -1;
 474         }
 475
 476         event->header.type = PERF_RECORD_MMAP;
 477
 478         /*
 479          * kernel uses 0 for user space maps, see kernel/perf_event.c
 480          * __perf_event_mmap
 481          */
 482         if (machine__is_host(machine))
 483                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 484         else
 485                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 486
 487         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 488                 size_t size;
 489
 490                 if (__map__is_kernel(pos))
 491                         continue;
 492
 493                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 494                 event->mmap.header.type = PERF_RECORD_MMAP;
 495                 event->mmap.header.size = (sizeof(event->mmap) -
 496                                         (sizeof(event->mmap.filename) - size));
 497                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 498                 event->mmap.header.size += machine->id_hdr_size;
 499                 event->mmap.start = pos->start;
 500                 event->mmap.len   = pos->end - pos->start;
 501                 event->mmap.pid   = machine->pid;
 502
 503                 memcpy(event->mmap.filename, pos->dso->long_name,
 504                        pos->dso->long_name_len + 1);
 505                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 506                         rc = -1;
 507                         break;
 508                 }
 509         }
 510
 511         free(event);
 512         return rc;
 513 }
 514
 515 static int __event__synthesize_thread(union perf_event *comm_event,
 516                                       union perf_event *mmap_event,
 517                                       union perf_event *fork_event,
 518                                       union perf_event *namespaces_event,
 519                                       pid_t pid, int full,
 520                                       perf_event__handler_t process,
 521                                       struct perf_tool *tool,
 522                                       struct machine *machine,
 523                                       bool mmap_data,
 524                                       unsigned int proc_map_timeout)
 525 {
 526         char filename[PATH_MAX];
 527         DIR *tasks;
 528         struct dirent *dirent;
 529         pid_t tgid, ppid;
 530         int rc = 0;
 531
 532         /* special case: only send one comm event using passed in pid */
 533         if (!full) {
 534                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 535                                                    process, machine);
 536
 537                 if (tgid == -1)
 538                         return -1;
 539
 540                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 541                                                       tgid, process, machine) < 0)
 542                         return -1;
 543
 544
 545                 return perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 546                                                           process, machine, mmap_data,
 547                                                           proc_map_timeout);
 548         }
 549
 550         if (machine__is_default_guest(machine))
 551                 return 0;
 552
 553         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 554                  machine->root_dir, pid);
 555
 556         tasks = opendir(filename);
 557         if (tasks == NULL) {
 558                 pr_debug("couldn't open %s\n", filename);
 559                 return 0;
 560         }
 561
 562         while ((dirent = readdir(tasks)) != NULL) {
 563                 char *end;
 564                 pid_t _pid;
 565
 566                 _pid = strtol(dirent->d_name, &end, 10);
 567                 if (*end)
 568                         continue;
 569
 570                 rc = -1;
 571                 if (perf_event__prepare_comm(comm_event, _pid, machine,
 572                                              &tgid, &ppid) != 0)
 573                         break;
 574
 575                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 576                                                 ppid, process, machine) < 0)
 577                         break;
 578
 579                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 580                                                       tgid, process, machine) < 0)
 581                         break;
 582
 583                 /*
 584                  * Send the prepared comm event
 585                  */
 586                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 587                         break;
 588
 589                 rc = 0;
 590                 if (_pid == pid) {
 591                         /* process the parent's maps too */
 592                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 593                                                 process, machine, mmap_data, proc_map_timeout);
 594                         if (rc)
 595                                 break;
 596                 }
 597         }
 598
 599         closedir(tasks);
 600         return rc;
 601 }
 602
 603 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 604                                       struct thread_map *threads,
 605                                       perf_event__handler_t process,
 606                                       struct machine *machine,
 607                                       bool mmap_data,
 608                                       unsigned int proc_map_timeout)
 609 {
 610         union perf_event *comm_event, *mmap_event, *fork_event;
 611         union perf_event *namespaces_event;
 612         int err = -1, thread, j;
 613
 614         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 615         if (comm_event == NULL)
 616                 goto out;
 617
 618         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 619         if (mmap_event == NULL)
 620                 goto out_free_comm;
 621
 622         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 623         if (fork_event == NULL)
 624                 goto out_free_mmap;
 625
 626         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 627                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 628                                   machine->id_hdr_size);
 629         if (namespaces_event == NULL)
 630                 goto out_free_fork;
 631
 632         err = 0;
 633         for (thread = 0; thread < threads->nr; ++thread) {
 634                 if (__event__synthesize_thread(comm_event, mmap_event,
 635                                                fork_event, namespaces_event,
 636                                                thread_map__pid(threads, thread), 0,
 637                                                process, tool, machine,
 638                                                mmap_data, proc_map_timeout)) {
 639                         err = -1;
 640                         break;
 641                 }
 642
 643                 /*
 644                  * comm.pid is set to thread group id by
 645                  * perf_event__synthesize_comm
 646                  */
 647                 if ((int) comm_event->comm.pid != thread_map__pid(threads, thread)) {
 648                         bool need_leader = true;
 649
 650                         /* is thread group leader in thread_map? */
 651                         for (j = 0; j < threads->nr; ++j) {
 652                                 if ((int) comm_event->comm.pid == thread_map__pid(threads, j)) {
 653                                         need_leader = false;
 654                                         break;
 655                                 }
 656                         }
 657
 658                         /* if not, generate events for it */
 659                         if (need_leader &&
 660                             __event__synthesize_thread(comm_event, mmap_event,
 661                                                        fork_event, namespaces_event,
 662                                                        comm_event->comm.pid, 0,
 663                                                        process, tool, machine,
 664                                                        mmap_data, proc_map_timeout)) {
 665                                 err = -1;
 666                                 break;
 667                         }
 668                 }
 669         }
 670         free(namespaces_event);
 671 out_free_fork:
 672         free(fork_event);
 673 out_free_mmap:
 674         free(mmap_event);
 675 out_free_comm:
 676         free(comm_event);
 677 out:
 678         return err;
 679 }
 680
 681 int perf_event__synthesize_threads(struct perf_tool *tool,
 682                                    perf_event__handler_t process,
 683                                    struct machine *machine,
 684                                    bool mmap_data,
 685                                    unsigned int proc_map_timeout)
 686 {
 687         DIR *proc;
 688         char proc_path[PATH_MAX];
 689         struct dirent *dirent;
 690         union perf_event *comm_event, *mmap_event, *fork_event;
 691         union perf_event *namespaces_event;
 692         int err = -1;
 693
 694         if (machine__is_default_guest(machine))
 695                 return 0;
 696
 697         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 698         if (comm_event == NULL)
 699                 goto out;
 700
 701         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 702         if (mmap_event == NULL)
 703                 goto out_free_comm;
 704
 705         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 706         if (fork_event == NULL)
 707                 goto out_free_mmap;
 708
 709         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 710                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 711                                   machine->id_hdr_size);
 712         if (namespaces_event == NULL)
 713                 goto out_free_fork;
 714
 715         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 716         proc = opendir(proc_path);
 717
 718         if (proc == NULL)
 719                 goto out_free_namespaces;
 720
 721         while ((dirent = readdir(proc)) != NULL) {
 722                 char *end;
 723                 pid_t pid = strtol(dirent->d_name, &end, 10);
 724
 725                 if (*end) /* only interested in proper numerical dirents */
 726                         continue;
 727                 /*
 728                  * We may race with exiting thread, so don't stop just because
 729                  * one thread couldn't be synthesized.
 730                  */
 731                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 732                                            namespaces_event, pid, 1, process,
 733                                            tool, machine, mmap_data,
 734                                            proc_map_timeout);
 735         }
 736
 737         err = 0;
 738         closedir(proc);
 739 out_free_namespaces:
 740         free(namespaces_event);
 741 out_free_fork:
 742         free(fork_event);
 743 out_free_mmap:
 744         free(mmap_event);
 745 out_free_comm:
 746         free(comm_event);
 747 out:
 748         return err;
 749 }
 750
 751 struct process_symbol_args {
 752         const char *name;
 753         u64        start;
 754 };
 755
 756 static int find_symbol_cb(void *arg, const char *name, char type,
 757                           u64 start)
 758 {
 759         struct process_symbol_args *args = arg;
 760
 761         /*
 762          * Must be a function or at least an alias, as in PARISC64, where "_text" is
 763          * an 'A' to the same address as "_stext".
 764          */
 765         if (!(symbol_type__is_a(type, MAP__FUNCTION) ||
 766               type == 'A') || strcmp(name, args->name))
 767                 return 0;
 768
 769         args->start = start;
 770         return 1;
 771 }
 772
 773 int kallsyms__get_function_start(const char *kallsyms_filename,
 774                                  const char *symbol_name, u64 *addr)
 775 {
 776         struct process_symbol_args args = { .name = symbol_name, };
 777
 778         if (kallsyms__parse(kallsyms_filename, &args, find_symbol_cb) <= 0)
 779                 return -1;
 780
 781         *addr = args.start;
 782         return 0;
 783 }
 784
 785 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 786                                        perf_event__handler_t process,
 787                                        struct machine *machine)
 788 {
 789         size_t size;
 790         const char *mmap_name;
 791         char name_buff[PATH_MAX];
 792         struct map *map = machine__kernel_map(machine);
 793         struct kmap *kmap;
 794         int err;
 795         union perf_event *event;
 796
 797         if (map == NULL)
 798                 return -1;
 799
 800         kmap = map__kmap(map);
 801         if (!kmap->ref_reloc_sym)
 802                 return -1;
 803
 804         /*
 805          * We should get this from /sys/kernel/sections/.text, but till that is
 806          * available use this, and after it is use this as a fallback for older
 807          * kernels.
 808          */
 809         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
 810         if (event == NULL) {
 811                 pr_debug("Not enough memory synthesizing mmap event "
 812                          "for kernel modules\n");
 813                 return -1;
 814         }
 815
 816         mmap_name = machine__mmap_name(machine, name_buff, sizeof(name_buff));
 817         if (machine__is_host(machine)) {
 818                 /*
 819                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 820                  * see kernel/perf_event.c __perf_event_mmap
 821                  */
 822                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 823         } else {
 824                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 825         }
 826
 827         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 828                         "%s%s", mmap_name, kmap->ref_reloc_sym->name) + 1;
 829         size = PERF_ALIGN(size, sizeof(u64));
 830         event->mmap.header.type = PERF_RECORD_MMAP;
 831         event->mmap.header.size = (sizeof(event->mmap) -
 832                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 833         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 834         event->mmap.start = map->start;
 835         event->mmap.len   = map->end - event->mmap.start;
 836         event->mmap.pid   = machine->pid;
 837
 838         err = perf_tool__process_synth_event(tool, event, machine, process);
 839         free(event);
 840
 841         return err;
 842 }
 843
 844 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
 845                                       struct thread_map *threads,
 846                                       perf_event__handler_t process,
 847                                       struct machine *machine)
 848 {
 849         union perf_event *event;
 850         int i, err, size;
 851
 852         size  = sizeof(event->thread_map);
 853         size += threads->nr * sizeof(event->thread_map.entries[0]);
 854
 855         event = zalloc(size);
 856         if (!event)
 857                 return -ENOMEM;
 858
 859         event->header.type = PERF_RECORD_THREAD_MAP;
 860         event->header.size = size;
 861         event->thread_map.nr = threads->nr;
 862
 863         for (i = 0; i < threads->nr; i++) {
 864                 struct thread_map_event_entry *entry = &event->thread_map.entries[i];
 865                 char *comm = thread_map__comm(threads, i);
 866
 867                 if (!comm)
 868                         comm = (char *) "";
 869
 870                 entry->pid = thread_map__pid(threads, i);
 871                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
 872         }
 873
 874         err = process(tool, event, NULL, machine);
 875
 876         free(event);
 877         return err;
 878 }
 879
 880 static void synthesize_cpus(struct cpu_map_entries *cpus,
 881                             struct cpu_map *map)
 882 {
 883         int i;
 884
 885         cpus->nr = map->nr;
 886
 887         for (i = 0; i < map->nr; i++)
 888                 cpus->cpu[i] = map->map[i];
 889 }
 890
 891 static void synthesize_mask(struct cpu_map_mask *mask,
 892                             struct cpu_map *map, int max)
 893 {
 894         int i;
 895
 896         mask->nr = BITS_TO_LONGS(max);
 897         mask->long_size = sizeof(long);
 898
 899         for (i = 0; i < map->nr; i++)
 900                 set_bit(map->map[i], mask->mask);
 901 }
 902
 903 static size_t cpus_size(struct cpu_map *map)
 904 {
 905         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
 906 }
 907
 908 static size_t mask_size(struct cpu_map *map, int *max)
 909 {
 910         int i;
 911
 912         *max = 0;
 913
 914         for (i = 0; i < map->nr; i++) {
 915                 /* bit possition of the cpu is + 1 */
 916                 int bit = map->map[i] + 1;
 917
 918                 if (bit > *max)
 919                         *max = bit;
 920         }
 921
 922         return sizeof(struct cpu_map_mask) + BITS_TO_LONGS(*max) * sizeof(long);
 923 }
 924
 925 void *cpu_map_data__alloc(struct cpu_map *map, size_t *size, u16 *type, int *max)
 926 {
 927         size_t size_cpus, size_mask;
 928         bool is_dummy = cpu_map__empty(map);
 929
 930         /*
 931          * Both array and mask data have variable size based
 932          * on the number of cpus and their actual values.
 933          * The size of the 'struct cpu_map_data' is:
 934          *
 935          *   array = size of 'struct cpu_map_entries' +
 936          *           number of cpus * sizeof(u64)
 937          *
 938          *   mask  = size of 'struct cpu_map_mask' +
 939          *           maximum cpu bit converted to size of longs
 940          *
 941          * and finaly + the size of 'struct cpu_map_data'.
 942          */
 943         size_cpus = cpus_size(map);
 944         size_mask = mask_size(map, max);
 945
 946         if (is_dummy || (size_cpus < size_mask)) {
 947                 *size += size_cpus;
 948                 *type  = PERF_CPU_MAP__CPUS;
 949         } else {
 950                 *size += size_mask;
 951                 *type  = PERF_CPU_MAP__MASK;
 952         }
 953
 954         *size += sizeof(struct cpu_map_data);
 955         *size = PERF_ALIGN(*size, sizeof(u64));
 956         return zalloc(*size);
 957 }
 958
 959 void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map,
 960                               u16 type, int max)
 961 {
 962         data->type = type;
 963
 964         switch (type) {
 965         case PERF_CPU_MAP__CPUS:
 966                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
 967                 break;
 968         case PERF_CPU_MAP__MASK:
 969                 synthesize_mask((struct cpu_map_mask *) data->data, map, max);
 970         default:
 971                 break;
 972         };
 973 }
 974
 975 static struct cpu_map_event* cpu_map_event__new(struct cpu_map *map)
 976 {
 977         size_t size = sizeof(struct cpu_map_event);
 978         struct cpu_map_event *event;
 979         int max;
 980         u16 type;
 981
 982         event = cpu_map_data__alloc(map, &size, &type, &max);
 983         if (!event)
 984                 return NULL;
 985
 986         event->header.type = PERF_RECORD_CPU_MAP;
 987         event->header.size = size;
 988         event->data.type   = type;
 989
 990         cpu_map_data__synthesize(&event->data, map, type, max);
 991         return event;
 992 }
 993
 994 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
 995                                    struct cpu_map *map,
 996                                    perf_event__handler_t process,
 997                                    struct machine *machine)
 998 {
 999         struct cpu_map_event *event;
1000         int err;
1001
1002         event = cpu_map_event__new(map);
1003         if (!event)
1004                 return -ENOMEM;
1005
1006         err = process(tool, (union perf_event *) event, NULL, machine);
1007
1008         free(event);
1009         return err;
1010 }
1011
1012 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1013                                        struct perf_stat_config *config,
1014                                        perf_event__handler_t process,
1015                                        struct machine *machine)
1016 {
1017         struct stat_config_event *event;
1018         int size, i = 0, err;
1019
1020         size  = sizeof(*event);
1021         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1022
1023         event = zalloc(size);
1024         if (!event)
1025                 return -ENOMEM;
1026
1027         event->header.type = PERF_RECORD_STAT_CONFIG;
1028         event->header.size = size;
1029         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1030
1031 #define ADD(__term, __val)                                      \
1032         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1033         event->data[i].val = __val;                             \
1034         i++;
1035
1036         ADD(AGGR_MODE,  config->aggr_mode)
1037         ADD(INTERVAL,   config->interval)
1038         ADD(SCALE,      config->scale)
1039
1040         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1041                   "stat config terms unbalanced\n");
1042 #undef ADD
1043
1044         err = process(tool, (union perf_event *) event, NULL, machine);
1045
1046         free(event);
1047         return err;
1048 }
1049
1050 int perf_event__synthesize_stat(struct perf_tool *tool,
1051                                 u32 cpu, u32 thread, u64 id,
1052                                 struct perf_counts_values *count,
1053                                 perf_event__handler_t process,
1054                                 struct machine *machine)
1055 {
1056         struct stat_event event;
1057
1058         event.header.type = PERF_RECORD_STAT;
1059         event.header.size = sizeof(event);
1060         event.header.misc = 0;
1061
1062         event.id        = id;
1063         event.cpu       = cpu;
1064         event.thread    = thread;
1065         event.val       = count->val;
1066         event.ena       = count->ena;
1067         event.run       = count->run;
1068
1069         return process(tool, (union perf_event *) &event, NULL, machine);
1070 }
1071
1072 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1073                                       u64 evtime, u64 type,
1074                                       perf_event__handler_t process,
1075                                       struct machine *machine)
1076 {
1077         struct stat_round_event event;
1078
1079         event.header.type = PERF_RECORD_STAT_ROUND;
1080         event.header.size = sizeof(event);
1081         event.header.misc = 0;
1082
1083         event.time = evtime;
1084         event.type = type;
1085
1086         return process(tool, (union perf_event *) &event, NULL, machine);
1087 }
1088
1089 void perf_event__read_stat_config(struct perf_stat_config *config,
1090                                   struct stat_config_event *event)
1091 {
1092         unsigned i;
1093
1094         for (i = 0; i < event->nr; i++) {
1095
1096                 switch (event->data[i].tag) {
1097 #define CASE(__term, __val)                                     \
1098                 case PERF_STAT_CONFIG_TERM__##__term:           \
1099                         config->__val = event->data[i].val;     \
1100                         break;
1101
1102                 CASE(AGGR_MODE, aggr_mode)
1103                 CASE(SCALE,     scale)
1104                 CASE(INTERVAL,  interval)
1105 #undef CASE
1106                 default:
1107                         pr_warning("unknown stat config term %" PRIu64 "\n",
1108                                    event->data[i].tag);
1109                 }
1110         }
1111 }
1112
1113 size_t perf_event__fprintf_comm(union perf_event *event, FILE *fp)
1114 {
1115         const char *s;
1116
1117         if (event->header.misc & PERF_RECORD_MISC_COMM_EXEC)
1118                 s = " exec";
1119         else
1120                 s = "";
1121
1122         return fprintf(fp, "%s: %s:%d/%d\n", s, event->comm.comm, event->comm.pid, event->comm.tid);
1123 }
1124
1125 size_t perf_event__fprintf_namespaces(union perf_event *event, FILE *fp)
1126 {
1127         size_t ret = 0;
1128         struct perf_ns_link_info *ns_link_info;
1129         u32 nr_namespaces, idx;
1130
1131         ns_link_info = event->namespaces.link_info;
1132         nr_namespaces = event->namespaces.nr_namespaces;
1133
1134         ret += fprintf(fp, " %d/%d - nr_namespaces: %u\n\t\t[",
1135                        event->namespaces.pid,
1136                        event->namespaces.tid,
1137                        nr_namespaces);
1138
1139         for (idx = 0; idx < nr_namespaces; idx++) {
1140                 if (idx && (idx % 4 == 0))
1141                         ret += fprintf(fp, "\n\t\t ");
1142
1143                 ret  += fprintf(fp, "%u/%s: %" PRIu64 "/%#" PRIx64 "%s", idx,
1144                                 perf_ns__name(idx), (u64)ns_link_info[idx].dev,
1145                                 (u64)ns_link_info[idx].ino,
1146                                 ((idx + 1) != nr_namespaces) ? ", " : "]\n");
1147         }
1148
1149         return ret;
1150 }
1151
1152 int perf_event__process_comm(struct perf_tool *tool __maybe_unused,
1153                              union perf_event *event,
1154                              struct perf_sample *sample,
1155                              struct machine *machine)
1156 {
1157         return machine__process_comm_event(machine, event, sample);
1158 }
1159
1160 int perf_event__process_namespaces(struct perf_tool *tool __maybe_unused,
1161                                    union perf_event *event,
1162                                    struct perf_sample *sample,
1163                                    struct machine *machine)
1164 {
1165         return machine__process_namespaces_event(machine, event, sample);
1166 }
1167
1168 int perf_event__process_lost(struct perf_tool *tool __maybe_unused,
1169                              union perf_event *event,
1170                              struct perf_sample *sample,
1171                              struct machine *machine)
1172 {
1173         return machine__process_lost_event(machine, event, sample);
1174 }
1175
1176 int perf_event__process_aux(struct perf_tool *tool __maybe_unused,
1177                             union perf_event *event,
1178                             struct perf_sample *sample __maybe_unused,
1179                             struct machine *machine)
1180 {
1181         return machine__process_aux_event(machine, event);
1182 }
1183
1184 int perf_event__process_itrace_start(struct perf_tool *tool __maybe_unused,
1185                                      union perf_event *event,
1186                                      struct perf_sample *sample __maybe_unused,
1187                                      struct machine *machine)
1188 {
1189         return machine__process_itrace_start_event(machine, event);
1190 }
1191
1192 int perf_event__process_lost_samples(struct perf_tool *tool __maybe_unused,
1193                                      union perf_event *event,
1194                                      struct perf_sample *sample,
1195                                      struct machine *machine)
1196 {
1197         return machine__process_lost_samples_event(machine, event, sample);
1198 }
1199
1200 int perf_event__process_switch(struct perf_tool *tool __maybe_unused,
1201                                union perf_event *event,
1202                                struct perf_sample *sample __maybe_unused,
1203                                struct machine *machine)
1204 {
1205         return machine__process_switch_event(machine, event);
1206 }
1207
1208 size_t perf_event__fprintf_mmap(union perf_event *event, FILE *fp)
1209 {
1210         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64 "]: %c %s\n",
1211                        event->mmap.pid, event->mmap.tid, event->mmap.start,
1212                        event->mmap.len, event->mmap.pgoff,
1213                        (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) ? 'r' : 'x',
1214                        event->mmap.filename);
1215 }
1216
1217 size_t perf_event__fprintf_mmap2(union perf_event *event, FILE *fp)
1218 {
1219         return fprintf(fp, " %d/%d: [%#" PRIx64 "(%#" PRIx64 ") @ %#" PRIx64
1220                            " %02x:%02x %"PRIu64" %"PRIu64"]: %c%c%c%c %s\n",
1221                        event->mmap2.pid, event->mmap2.tid, event->mmap2.start,
1222                        event->mmap2.len, event->mmap2.pgoff, event->mmap2.maj,
1223                        event->mmap2.min, event->mmap2.ino,
1224                        event->mmap2.ino_generation,
1225                        (event->mmap2.prot & PROT_READ) ? 'r' : '-',
1226                        (event->mmap2.prot & PROT_WRITE) ? 'w' : '-',
1227                        (event->mmap2.prot & PROT_EXEC) ? 'x' : '-',
1228                        (event->mmap2.flags & MAP_SHARED) ? 's' : 'p',
1229                        event->mmap2.filename);
1230 }
1231
1232 size_t perf_event__fprintf_thread_map(union perf_event *event, FILE *fp)
1233 {
1234         struct thread_map *threads = thread_map__new_event(&event->thread_map);
1235         size_t ret;
1236
1237         ret = fprintf(fp, " nr: ");
1238
1239         if (threads)
1240                 ret += thread_map__fprintf(threads, fp);
1241         else
1242                 ret += fprintf(fp, "failed to get threads from event\n");
1243
1244         thread_map__put(threads);
1245         return ret;
1246 }
1247
1248 size_t perf_event__fprintf_cpu_map(union perf_event *event, FILE *fp)
1249 {
1250         struct cpu_map *cpus = cpu_map__new_data(&event->cpu_map.data);
1251         size_t ret;
1252
1253         ret = fprintf(fp, ": ");
1254
1255         if (cpus)
1256                 ret += cpu_map__fprintf(cpus, fp);
1257         else
1258                 ret += fprintf(fp, "failed to get cpumap from event\n");
1259
1260         cpu_map__put(cpus);
1261         return ret;
1262 }
1263
1264 int perf_event__process_mmap(struct perf_tool *tool __maybe_unused,
1265                              union perf_event *event,
1266                              struct perf_sample *sample,
1267                              struct machine *machine)
1268 {
1269         return machine__process_mmap_event(machine, event, sample);
1270 }
1271
1272 int perf_event__process_mmap2(struct perf_tool *tool __maybe_unused,
1273                              union perf_event *event,
1274                              struct perf_sample *sample,
1275                              struct machine *machine)
1276 {
1277         return machine__process_mmap2_event(machine, event, sample);
1278 }
1279
1280 size_t perf_event__fprintf_task(union perf_event *event, FILE *fp)
1281 {
1282         return fprintf(fp, "(%d:%d):(%d:%d)\n",
1283                        event->fork.pid, event->fork.tid,
1284                        event->fork.ppid, event->fork.ptid);
1285 }
1286
1287 int perf_event__process_fork(struct perf_tool *tool __maybe_unused,
1288                              union perf_event *event,
1289                              struct perf_sample *sample,
1290                              struct machine *machine)
1291 {
1292         return machine__process_fork_event(machine, event, sample);
1293 }
1294
1295 int perf_event__process_exit(struct perf_tool *tool __maybe_unused,
1296                              union perf_event *event,
1297                              struct perf_sample *sample,
1298                              struct machine *machine)
1299 {
1300         return machine__process_exit_event(machine, event, sample);
1301 }
1302
1303 size_t perf_event__fprintf_aux(union perf_event *event, FILE *fp)
1304 {
1305         return fprintf(fp, " offset: %#"PRIx64" size: %#"PRIx64" flags: %#"PRIx64" [%s%s%s]\n",
1306                        event->aux.aux_offset, event->aux.aux_size,
1307                        event->aux.flags,
1308                        event->aux.flags & PERF_AUX_FLAG_TRUNCATED ? "T" : "",
1309                        event->aux.flags & PERF_AUX_FLAG_OVERWRITE ? "O" : "",
1310                        event->aux.flags & PERF_AUX_FLAG_PARTIAL   ? "P" : "");
1311 }
1312
1313 size_t perf_event__fprintf_itrace_start(union perf_event *event, FILE *fp)
1314 {
1315         return fprintf(fp, " pid: %u tid: %u\n",
1316                        event->itrace_start.pid, event->itrace_start.tid);
1317 }
1318
1319 size_t perf_event__fprintf_switch(union perf_event *event, FILE *fp)
1320 {
1321         bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
1322         const char *in_out = out ? "OUT" : "IN ";
1323
1324         if (event->header.type == PERF_RECORD_SWITCH)
1325                 return fprintf(fp, " %s\n", in_out);
1326
1327         return fprintf(fp, " %s  %s pid/tid: %5u/%-5u\n",
1328                        in_out, out ? "next" : "prev",
1329                        event->context_switch.next_prev_pid,
1330                        event->context_switch.next_prev_tid);
1331 }
1332
1333 size_t perf_event__fprintf(union perf_event *event, FILE *fp)
1334 {
1335         size_t ret = fprintf(fp, "PERF_RECORD_%s",
1336                              perf_event__name(event->header.type));
1337
1338         switch (event->header.type) {
1339         case PERF_RECORD_COMM:
1340                 ret += perf_event__fprintf_comm(event, fp);
1341                 break;
1342         case PERF_RECORD_FORK:
1343         case PERF_RECORD_EXIT:
1344                 ret += perf_event__fprintf_task(event, fp);
1345                 break;
1346         case PERF_RECORD_MMAP:
1347                 ret += perf_event__fprintf_mmap(event, fp);
1348                 break;
1349         case PERF_RECORD_NAMESPACES:
1350                 ret += perf_event__fprintf_namespaces(event, fp);
1351                 break;
1352         case PERF_RECORD_MMAP2:
1353                 ret += perf_event__fprintf_mmap2(event, fp);
1354                 break;
1355         case PERF_RECORD_AUX:
1356                 ret += perf_event__fprintf_aux(event, fp);
1357                 break;
1358         case PERF_RECORD_ITRACE_START:
1359                 ret += perf_event__fprintf_itrace_start(event, fp);
1360                 break;
1361         case PERF_RECORD_SWITCH:
1362         case PERF_RECORD_SWITCH_CPU_WIDE:
1363                 ret += perf_event__fprintf_switch(event, fp);
1364                 break;
1365         default:
1366                 ret += fprintf(fp, "\n");
1367         }
1368
1369         return ret;
1370 }
1371
1372 int perf_event__process(struct perf_tool *tool __maybe_unused,
1373                         union perf_event *event,
1374                         struct perf_sample *sample,
1375                         struct machine *machine)
1376 {
1377         return machine__process_event(machine, event, sample);
1378 }
1379
1380 void thread__find_addr_map(struct thread *thread, u8 cpumode,
1381                            enum map_type type, u64 addr,
1382                            struct addr_location *al)
1383 {
1384         struct map_groups *mg = thread->mg;
1385         struct machine *machine = mg->machine;
1386         bool load_map = false;
1387
1388         al->machine = machine;
1389         al->thread = thread;
1390         al->addr = addr;
1391         al->cpumode = cpumode;
1392         al->filtered = 0;
1393
1394         if (machine == NULL) {
1395                 al->map = NULL;
1396                 return;
1397         }
1398
1399         if (cpumode == PERF_RECORD_MISC_KERNEL && perf_host) {
1400                 al->level = 'k';
1401                 mg = &machine->kmaps;
1402                 load_map = true;
1403         } else if (cpumode == PERF_RECORD_MISC_USER && perf_host) {
1404                 al->level = '.';
1405         } else if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
1406                 al->level = 'g';
1407                 mg = &machine->kmaps;
1408                 load_map = true;
1409         } else if (cpumode == PERF_RECORD_MISC_GUEST_USER && perf_guest) {
1410                 al->level = 'u';
1411         } else {
1412                 al->level = 'H';
1413                 al->map = NULL;
1414
1415                 if ((cpumode == PERF_RECORD_MISC_GUEST_USER ||
1416                         cpumode == PERF_RECORD_MISC_GUEST_KERNEL) &&
1417                         !perf_guest)
1418                         al->filtered |= (1 << HIST_FILTER__GUEST);
1419                 if ((cpumode == PERF_RECORD_MISC_USER ||
1420                         cpumode == PERF_RECORD_MISC_KERNEL) &&
1421                         !perf_host)
1422                         al->filtered |= (1 << HIST_FILTER__HOST);
1423
1424                 return;
1425         }
1426 try_again:
1427         al->map = map_groups__find(mg, type, al->addr);
1428         if (al->map == NULL) {
1429                 /*
1430                  * If this is outside of all known maps, and is a negative
1431                  * address, try to look it up in the kernel dso, as it might be
1432                  * a vsyscall or vdso (which executes in user-mode).
1433                  *
1434                  * XXX This is nasty, we should have a symbol list in the
1435                  * "[vdso]" dso, but for now lets use the old trick of looking
1436                  * in the whole kernel symbol list.
1437                  */
1438                 if (cpumode == PERF_RECORD_MISC_USER && machine &&
1439                     mg != &machine->kmaps &&
1440                     machine__kernel_ip(machine, al->addr)) {
1441                         mg = &machine->kmaps;
1442                         load_map = true;
1443                         goto try_again;
1444                 }
1445         } else {
1446                 /*
1447                  * Kernel maps might be changed when loading symbols so loading
1448                  * must be done prior to using kernel maps.
1449                  */
1450                 if (load_map)
1451                         map__load(al->map);
1452                 al->addr = al->map->map_ip(al->map, al->addr);
1453         }
1454 }
1455
1456 void thread__find_addr_location(struct thread *thread,
1457                                 u8 cpumode, enum map_type type, u64 addr,
1458                                 struct addr_location *al)
1459 {
1460         thread__find_addr_map(thread, cpumode, type, addr, al);
1461         if (al->map != NULL)
1462                 al->sym = map__find_symbol(al->map, al->addr);
1463         else
1464                 al->sym = NULL;
1465 }
1466
1467 /*
1468  * Callers need to drop the reference to al->thread, obtained in
1469  * machine__findnew_thread()
1470  */
1471 int machine__resolve(struct machine *machine, struct addr_location *al,
1472                      struct perf_sample *sample)
1473 {
1474         struct thread *thread = machine__findnew_thread(machine, sample->pid,
1475                                                         sample->tid);
1476
1477         if (thread == NULL)
1478                 return -1;
1479
1480         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
1481         /*
1482          * Have we already created the kernel maps for this machine?
1483          *
1484          * This should have happened earlier, when we processed the kernel MMAP
1485          * events, but for older perf.data files there was no such thing, so do
1486          * it now.
1487          */
1488         if (sample->cpumode == PERF_RECORD_MISC_KERNEL &&
1489             machine__kernel_map(machine) == NULL)
1490                 machine__create_kernel_maps(machine);
1491
1492         thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->ip, al);
1493         dump_printf(" ...... dso: %s\n",
1494                     al->map ? al->map->dso->long_name :
1495                         al->level == 'H' ? "[hypervisor]" : "<not found>");
1496
1497         if (thread__is_filtered(thread))
1498                 al->filtered |= (1 << HIST_FILTER__THREAD);
1499
1500         al->sym = NULL;
1501         al->cpu = sample->cpu;
1502         al->socket = -1;
1503
1504         if (al->cpu >= 0) {
1505                 struct perf_env *env = machine->env;
1506
1507                 if (env && env->cpu)
1508                         al->socket = env->cpu[al->cpu].socket_id;
1509         }
1510
1511         if (al->map) {
1512                 struct dso *dso = al->map->dso;
1513
1514                 if (symbol_conf.dso_list &&
1515                     (!dso || !(strlist__has_entry(symbol_conf.dso_list,
1516                                                   dso->short_name) ||
1517                                (dso->short_name != dso->long_name &&
1518                                 strlist__has_entry(symbol_conf.dso_list,
1519                                                    dso->long_name))))) {
1520                         al->filtered |= (1 << HIST_FILTER__DSO);
1521                 }
1522
1523                 al->sym = map__find_symbol(al->map, al->addr);
1524         } else if (symbol_conf.dso_list) {
1525                 al->filtered |= (1 << HIST_FILTER__DSO);
1526         }
1527
1528         if (symbol_conf.sym_list &&
1529                 (!al->sym || !strlist__has_entry(symbol_conf.sym_list,
1530                                                 al->sym->name))) {
1531                 al->filtered |= (1 << HIST_FILTER__SYMBOL);
1532         }
1533
1534         return 0;
1535 }
1536
1537 /*
1538  * The preprocess_sample method will return with reference counts for the
1539  * in it, when done using (and perhaps getting ref counts if needing to
1540  * keep a pointer to one of those entries) it must be paired with
1541  * addr_location__put(), so that the refcounts can be decremented.
1542  */
1543 void addr_location__put(struct addr_location *al)
1544 {
1545         thread__zput(al->thread);
1546 }
1547
1548 bool is_bts_event(struct perf_event_attr *attr)
1549 {
1550         return attr->type == PERF_TYPE_HARDWARE &&
1551                (attr->config & PERF_COUNT_HW_BRANCH_INSTRUCTIONS) &&
1552                attr->sample_period == 1;
1553 }
1554
1555 bool sample_addr_correlates_sym(struct perf_event_attr *attr)
1556 {
1557         if (attr->type == PERF_TYPE_SOFTWARE &&
1558             (attr->config == PERF_COUNT_SW_PAGE_FAULTS ||
1559              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
1560              attr->config == PERF_COUNT_SW_PAGE_FAULTS_MAJ))
1561                 return true;
1562
1563         if (is_bts_event(attr))
1564                 return true;
1565
1566         return false;
1567 }
1568
1569 void thread__resolve(struct thread *thread, struct addr_location *al,
1570                      struct perf_sample *sample)
1571 {
1572         thread__find_addr_map(thread, sample->cpumode, MAP__FUNCTION, sample->addr, al);
1573         if (!al->map)
1574                 thread__find_addr_map(thread, sample->cpumode, MAP__VARIABLE,
1575                                       sample->addr, al);
1576
1577         al->cpu = sample->cpu;
1578         al->sym = NULL;
1579
1580         if (al->map)
1581                 al->sym = map__find_symbol(al->map, al->addr);
1582 }