tools/perf/util/synthetic-events.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "util/debug.h"
   4 #include "util/dso.h"
   5 #include "util/event.h"
   6 #include "util/evlist.h"
   7 #include "util/machine.h"
   8 #include "util/map.h"
   9 #include "util/map_symbol.h"
  10 #include "util/branch.h"
  11 #include "util/memswap.h"
  12 #include "util/namespaces.h"
  13 #include "util/session.h"
  14 #include "util/stat.h"
  15 #include "util/symbol.h"
  16 #include "util/synthetic-events.h"
  17 #include "util/target.h"
  18 #include "util/time-utils.h"
  19 #include "util/cgroup.h"
  20 #include <linux/bitops.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/zalloc.h>
  24 #include <linux/perf_event.h>
  25 #include <asm/bug.h>
  26 #include <perf/evsel.h>
  27 #include <perf/cpumap.h>
  28 #include <internal/lib.h> // page_size
  29 #include <internal/threadmap.h>
  30 #include <perf/threadmap.h>
  31 #include <symbol/kallsyms.h>
  32 #include <dirent.h>
  33 #include <errno.h>
  34 #include <inttypes.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  38 #include <api/fs/fs.h>
  39 #include <api/io.h>
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <fcntl.h>
  43 #include <unistd.h>
  44
  45 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
  46
  47 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
  48
  49 int perf_tool__process_synth_event(struct perf_tool *tool,
  50                                    union perf_event *event,
  51                                    struct machine *machine,
  52                                    perf_event__handler_t process)
  53 {
  54         struct perf_sample synth_sample = {
  55                 .pid       = -1,
  56                 .tid       = -1,
  57                 .time      = -1,
  58                 .stream_id = -1,
  59                 .cpu       = -1,
  60                 .period    = 1,
  61                 .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
  62         };
  63
  64         return process(tool, event, &synth_sample, machine);
  65 };
  66
  67 /*
  68  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  69  * the comm, tgid and ppid.
  70  */
  71 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
  72                                     pid_t *tgid, pid_t *ppid, bool *kernel)
  73 {
  74         char bf[4096];
  75         int fd;
  76         size_t size = 0;
  77         ssize_t n;
  78         char *name, *tgids, *ppids, *vmpeak, *threads;
  79
  80         *tgid = -1;
  81         *ppid = -1;
  82
  83         if (pid)
  84                 snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
  85         else
  86                 snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
  87
  88         fd = open(bf, O_RDONLY);
  89         if (fd < 0) {
  90                 pr_debug("couldn't open %s\n", bf);
  91                 return -1;
  92         }
  93
  94         n = read(fd, bf, sizeof(bf) - 1);
  95         close(fd);
  96         if (n <= 0) {
  97                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  98                            tid);
  99                 return -1;
 100         }
 101         bf[n] = '\0';
 102
 103         name = strstr(bf, "Name:");
 104         tgids = strstr(name ?: bf, "Tgid:");
 105         ppids = strstr(tgids ?: bf, "PPid:");
 106         vmpeak = strstr(ppids ?: bf, "VmPeak:");
 107
 108         if (vmpeak)
 109                 threads = NULL;
 110         else
 111                 threads = strstr(ppids ?: bf, "Threads:");
 112
 113         if (name) {
 114                 char *nl;
 115
 116                 name = skip_spaces(name + 5);  /* strlen("Name:") */
 117                 nl = strchr(name, '\n');
 118                 if (nl)
 119                         *nl = '\0';
 120
 121                 size = strlen(name);
 122                 if (size >= len)
 123                         size = len - 1;
 124                 memcpy(comm, name, size);
 125                 comm[size] = '\0';
 126         } else {
 127                 pr_debug("Name: string not found for pid %d\n", tid);
 128         }
 129
 130         if (tgids) {
 131                 tgids += 5;  /* strlen("Tgid:") */
 132                 *tgid = atoi(tgids);
 133         } else {
 134                 pr_debug("Tgid: string not found for pid %d\n", tid);
 135         }
 136
 137         if (ppids) {
 138                 ppids += 5;  /* strlen("PPid:") */
 139                 *ppid = atoi(ppids);
 140         } else {
 141                 pr_debug("PPid: string not found for pid %d\n", tid);
 142         }
 143
 144         if (!vmpeak && threads)
 145                 *kernel = true;
 146         else
 147                 *kernel = false;
 148
 149         return 0;
 150 }
 151
 152 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
 153                                     struct machine *machine,
 154                                     pid_t *tgid, pid_t *ppid, bool *kernel)
 155 {
 156         size_t size;
 157
 158         *ppid = -1;
 159
 160         memset(&event->comm, 0, sizeof(event->comm));
 161
 162         if (machine__is_host(machine)) {
 163                 if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
 164                                              sizeof(event->comm.comm),
 165                                              tgid, ppid, kernel) != 0) {
 166                         return -1;
 167                 }
 168         } else {
 169                 *tgid = machine->pid;
 170         }
 171
 172         if (*tgid < 0)
 173                 return -1;
 174
 175         event->comm.pid = *tgid;
 176         event->comm.header.type = PERF_RECORD_COMM;
 177
 178         size = strlen(event->comm.comm) + 1;
 179         size = PERF_ALIGN(size, sizeof(u64));
 180         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 181         event->comm.header.size = (sizeof(event->comm) -
 182                                 (sizeof(event->comm.comm) - size) +
 183                                 machine->id_hdr_size);
 184         event->comm.tid = tid;
 185
 186         return 0;
 187 }
 188
 189 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 190                                          union perf_event *event, pid_t pid,
 191                                          perf_event__handler_t process,
 192                                          struct machine *machine)
 193 {
 194         pid_t tgid, ppid;
 195         bool kernel_thread;
 196
 197         if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
 198                                      &kernel_thread) != 0)
 199                 return -1;
 200
 201         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 202                 return -1;
 203
 204         return tgid;
 205 }
 206
 207 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
 208                                          struct perf_ns_link_info *ns_link_info)
 209 {
 210         struct stat64 st;
 211         char proc_ns[128];
 212
 213         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
 214         if (stat64(proc_ns, &st) == 0) {
 215                 ns_link_info->dev = st.st_dev;
 216                 ns_link_info->ino = st.st_ino;
 217         }
 218 }
 219
 220 int perf_event__synthesize_namespaces(struct perf_tool *tool,
 221                                       union perf_event *event,
 222                                       pid_t pid, pid_t tgid,
 223                                       perf_event__handler_t process,
 224                                       struct machine *machine)
 225 {
 226         u32 idx;
 227         struct perf_ns_link_info *ns_link_info;
 228
 229         if (!tool || !tool->namespace_events)
 230                 return 0;
 231
 232         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
 233                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 234                machine->id_hdr_size));
 235
 236         event->namespaces.pid = tgid;
 237         event->namespaces.tid = pid;
 238
 239         event->namespaces.nr_namespaces = NR_NAMESPACES;
 240
 241         ns_link_info = event->namespaces.link_info;
 242
 243         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
 244                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
 245                                              &ns_link_info[idx]);
 246
 247         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
 248
 249         event->namespaces.header.size = (sizeof(event->namespaces) +
 250                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 251                         machine->id_hdr_size);
 252
 253         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 254                 return -1;
 255
 256         return 0;
 257 }
 258
 259 static int perf_event__synthesize_fork(struct perf_tool *tool,
 260                                        union perf_event *event,
 261                                        pid_t pid, pid_t tgid, pid_t ppid,
 262                                        perf_event__handler_t process,
 263                                        struct machine *machine)
 264 {
 265         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 266
 267         /*
 268          * for main thread set parent to ppid from status file. For other
 269          * threads set parent pid to main thread. ie., assume main thread
 270          * spawns all threads in a process
 271         */
 272         if (tgid == pid) {
 273                 event->fork.ppid = ppid;
 274                 event->fork.ptid = ppid;
 275         } else {
 276                 event->fork.ppid = tgid;
 277                 event->fork.ptid = tgid;
 278         }
 279         event->fork.pid  = tgid;
 280         event->fork.tid  = pid;
 281         event->fork.header.type = PERF_RECORD_FORK;
 282         event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
 283
 284         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 285
 286         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 287                 return -1;
 288
 289         return 0;
 290 }
 291
 292 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
 293                                 u32 *prot, u32 *flags, __u64 *offset,
 294                                 u32 *maj, u32 *min,
 295                                 __u64 *inode,
 296                                 ssize_t pathname_size, char *pathname)
 297 {
 298         __u64 temp;
 299         int ch;
 300         char *start_pathname = pathname;
 301
 302         if (io__get_hex(io, start) != '-')
 303                 return false;
 304         if (io__get_hex(io, end) != ' ')
 305                 return false;
 306
 307         /* map protection and flags bits */
 308         *prot = 0;
 309         ch = io__get_char(io);
 310         if (ch == 'r')
 311                 *prot |= PROT_READ;
 312         else if (ch != '-')
 313                 return false;
 314         ch = io__get_char(io);
 315         if (ch == 'w')
 316                 *prot |= PROT_WRITE;
 317         else if (ch != '-')
 318                 return false;
 319         ch = io__get_char(io);
 320         if (ch == 'x')
 321                 *prot |= PROT_EXEC;
 322         else if (ch != '-')
 323                 return false;
 324         ch = io__get_char(io);
 325         if (ch == 's')
 326                 *flags = MAP_SHARED;
 327         else if (ch == 'p')
 328                 *flags = MAP_PRIVATE;
 329         else
 330                 return false;
 331         if (io__get_char(io) != ' ')
 332                 return false;
 333
 334         if (io__get_hex(io, offset) != ' ')
 335                 return false;
 336
 337         if (io__get_hex(io, &temp) != ':')
 338                 return false;
 339         *maj = temp;
 340         if (io__get_hex(io, &temp) != ' ')
 341                 return false;
 342         *min = temp;
 343
 344         ch = io__get_dec(io, inode);
 345         if (ch != ' ') {
 346                 *pathname = '\0';
 347                 return ch == '\n';
 348         }
 349         do {
 350                 ch = io__get_char(io);
 351         } while (ch == ' ');
 352         while (true) {
 353                 if (ch < 0)
 354                         return false;
 355                 if (ch == '\0' || ch == '\n' ||
 356                     (pathname + 1 - start_pathname) >= pathname_size) {
 357                         *pathname = '\0';
 358                         return true;
 359                 }
 360                 *pathname++ = ch;
 361                 ch = io__get_char(io);
 362         }
 363 }
 364
 365 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
 366                                              bool is_kernel)
 367 {
 368         struct build_id bid;
 369         int rc;
 370
 371         if (is_kernel)
 372                 rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
 373         else
 374                 rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
 375
 376         if (rc == 0) {
 377                 memcpy(event->build_id, bid.data, sizeof(bid.data));
 378                 event->build_id_size = (u8) bid.size;
 379                 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
 380                 event->__reserved_1 = 0;
 381                 event->__reserved_2 = 0;
 382         } else {
 383                 if (event->filename[0] == '/') {
 384                         pr_debug2("Failed to read build ID for %s\n",
 385                                   event->filename);
 386                 }
 387         }
 388 }
 389
 390 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 391                                        union perf_event *event,
 392                                        pid_t pid, pid_t tgid,
 393                                        perf_event__handler_t process,
 394                                        struct machine *machine,
 395                                        bool mmap_data)
 396 {
 397         unsigned long long t;
 398         char bf[BUFSIZ];
 399         struct io io;
 400         bool truncation = false;
 401         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 402         int rc = 0;
 403         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 404         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 405
 406         if (machine__is_default_guest(machine))
 407                 return 0;
 408
 409         snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
 410                 machine->root_dir, pid, pid);
 411
 412         io.fd = open(bf, O_RDONLY, 0);
 413         if (io.fd < 0) {
 414                 /*
 415                  * We raced with a task exiting - just return:
 416                  */
 417                 pr_debug("couldn't open %s\n", bf);
 418                 return -1;
 419         }
 420         io__init(&io, io.fd, bf, sizeof(bf));
 421
 422         event->header.type = PERF_RECORD_MMAP2;
 423         t = rdclock();
 424
 425         while (!io.eof) {
 426                 static const char anonstr[] = "//anon";
 427                 size_t size, aligned_size;
 428
 429                 /* ensure null termination since stack will be reused. */
 430                 event->mmap2.filename[0] = '\0';
 431
 432                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 433                 if (!read_proc_maps_line(&io,
 434                                         &event->mmap2.start,
 435                                         &event->mmap2.len,
 436                                         &event->mmap2.prot,
 437                                         &event->mmap2.flags,
 438                                         &event->mmap2.pgoff,
 439                                         &event->mmap2.maj,
 440                                         &event->mmap2.min,
 441                                         &event->mmap2.ino,
 442                                         sizeof(event->mmap2.filename),
 443                                         event->mmap2.filename))
 444                         continue;
 445
 446                 if ((rdclock() - t) > timeout) {
 447                         pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
 448                                    "You may want to increase "
 449                                    "the time limit by --proc-map-timeout\n",
 450                                    machine->root_dir, pid, pid);
 451                         truncation = true;
 452                         goto out;
 453                 }
 454
 455                 event->mmap2.ino_generation = 0;
 456
 457                 /*
 458                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 459                  */
 460                 if (machine__is_host(machine))
 461                         event->header.misc = PERF_RECORD_MISC_USER;
 462                 else
 463                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 464
 465                 if ((event->mmap2.prot & PROT_EXEC) == 0) {
 466                         if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
 467                                 continue;
 468
 469                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 470                 }
 471
 472 out:
 473                 if (truncation)
 474                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 475
 476                 if (!strcmp(event->mmap2.filename, ""))
 477                         strcpy(event->mmap2.filename, anonstr);
 478
 479                 if (hugetlbfs_mnt_len &&
 480                     !strncmp(event->mmap2.filename, hugetlbfs_mnt,
 481                              hugetlbfs_mnt_len)) {
 482                         strcpy(event->mmap2.filename, anonstr);
 483                         event->mmap2.flags |= MAP_HUGETLB;
 484                 }
 485
 486                 size = strlen(event->mmap2.filename) + 1;
 487                 aligned_size = PERF_ALIGN(size, sizeof(u64));
 488                 event->mmap2.len -= event->mmap.start;
 489                 event->mmap2.header.size = (sizeof(event->mmap2) -
 490                                         (sizeof(event->mmap2.filename) - aligned_size));
 491                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
 492                         (aligned_size - size));
 493                 event->mmap2.header.size += machine->id_hdr_size;
 494                 event->mmap2.pid = tgid;
 495                 event->mmap2.tid = pid;
 496
 497                 if (symbol_conf.buildid_mmap2)
 498                         perf_record_mmap2__read_build_id(&event->mmap2, false);
 499
 500                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 501                         rc = -1;
 502                         break;
 503                 }
 504
 505                 if (truncation)
 506                         break;
 507         }
 508
 509         close(io.fd);
 510         return rc;
 511 }
 512
 513 #ifdef HAVE_FILE_HANDLE
 514 static int perf_event__synthesize_cgroup(struct perf_tool *tool,
 515                                          union perf_event *event,
 516                                          char *path, size_t mount_len,
 517                                          perf_event__handler_t process,
 518                                          struct machine *machine)
 519 {
 520         size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
 521         size_t path_len = strlen(path) - mount_len + 1;
 522         struct {
 523                 struct file_handle fh;
 524                 uint64_t cgroup_id;
 525         } handle;
 526         int mount_id;
 527
 528         while (path_len % sizeof(u64))
 529                 path[mount_len + path_len++] = '\0';
 530
 531         memset(&event->cgroup, 0, event_size);
 532
 533         event->cgroup.header.type = PERF_RECORD_CGROUP;
 534         event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
 535
 536         handle.fh.handle_bytes = sizeof(handle.cgroup_id);
 537         if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
 538                 pr_debug("stat failed: %s\n", path);
 539                 return -1;
 540         }
 541
 542         event->cgroup.id = handle.cgroup_id;
 543         strncpy(event->cgroup.path, path + mount_len, path_len);
 544         memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
 545
 546         if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
 547                 pr_debug("process synth event failed\n");
 548                 return -1;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
 555                                         union perf_event *event,
 556                                         char *path, size_t mount_len,
 557                                         perf_event__handler_t process,
 558                                         struct machine *machine)
 559 {
 560         size_t pos = strlen(path);
 561         DIR *d;
 562         struct dirent *dent;
 563         int ret = 0;
 564
 565         if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
 566                                           process, machine) < 0)
 567                 return -1;
 568
 569         d = opendir(path);
 570         if (d == NULL) {
 571                 pr_debug("failed to open directory: %s\n", path);
 572                 return -1;
 573         }
 574
 575         while ((dent = readdir(d)) != NULL) {
 576                 if (dent->d_type != DT_DIR)
 577                         continue;
 578                 if (!strcmp(dent->d_name, ".") ||
 579                     !strcmp(dent->d_name, ".."))
 580                         continue;
 581
 582                 /* any sane path should be less than PATH_MAX */
 583                 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
 584                         continue;
 585
 586                 if (path[pos - 1] != '/')
 587                         strcat(path, "/");
 588                 strcat(path, dent->d_name);
 589
 590                 ret = perf_event__walk_cgroup_tree(tool, event, path,
 591                                                    mount_len, process, machine);
 592                 if (ret < 0)
 593                         break;
 594
 595                 path[pos] = '\0';
 596         }
 597
 598         closedir(d);
 599         return ret;
 600 }
 601
 602 int perf_event__synthesize_cgroups(struct perf_tool *tool,
 603                                    perf_event__handler_t process,
 604                                    struct machine *machine)
 605 {
 606         union perf_event event;
 607         char cgrp_root[PATH_MAX];
 608         size_t mount_len;  /* length of mount point in the path */
 609
 610         if (!tool || !tool->cgroup_events)
 611                 return 0;
 612
 613         if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
 614                 pr_debug("cannot find cgroup mount point\n");
 615                 return -1;
 616         }
 617
 618         mount_len = strlen(cgrp_root);
 619         /* make sure the path starts with a slash (after mount point) */
 620         strcat(cgrp_root, "/");
 621
 622         if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
 623                                          process, machine) < 0)
 624                 return -1;
 625
 626         return 0;
 627 }
 628 #else
 629 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
 630                                    perf_event__handler_t process __maybe_unused,
 631                                    struct machine *machine __maybe_unused)
 632 {
 633         return -1;
 634 }
 635 #endif
 636
 637 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 638                                    struct machine *machine)
 639 {
 640         int rc = 0;
 641         struct map *pos;
 642         struct maps *maps = machine__kernel_maps(machine);
 643         union perf_event *event;
 644         size_t size = symbol_conf.buildid_mmap2 ?
 645                         sizeof(event->mmap2) : sizeof(event->mmap);
 646
 647         event = zalloc(size + machine->id_hdr_size);
 648         if (event == NULL) {
 649                 pr_debug("Not enough memory synthesizing mmap event "
 650                          "for kernel modules\n");
 651                 return -1;
 652         }
 653
 654         /*
 655          * kernel uses 0 for user space maps, see kernel/perf_event.c
 656          * __perf_event_mmap
 657          */
 658         if (machine__is_host(machine))
 659                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 660         else
 661                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 662
 663         maps__for_each_entry(maps, pos) {
 664                 if (!__map__is_kmodule(pos))
 665                         continue;
 666
 667                 if (symbol_conf.buildid_mmap2) {
 668                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 669                         event->mmap2.header.type = PERF_RECORD_MMAP2;
 670                         event->mmap2.header.size = (sizeof(event->mmap2) -
 671                                                 (sizeof(event->mmap2.filename) - size));
 672                         memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 673                         event->mmap2.header.size += machine->id_hdr_size;
 674                         event->mmap2.start = pos->start;
 675                         event->mmap2.len   = pos->end - pos->start;
 676                         event->mmap2.pid   = machine->pid;
 677
 678                         memcpy(event->mmap2.filename, pos->dso->long_name,
 679                                pos->dso->long_name_len + 1);
 680
 681                         perf_record_mmap2__read_build_id(&event->mmap2, false);
 682                 } else {
 683                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 684                         event->mmap.header.type = PERF_RECORD_MMAP;
 685                         event->mmap.header.size = (sizeof(event->mmap) -
 686                                                 (sizeof(event->mmap.filename) - size));
 687                         memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 688                         event->mmap.header.size += machine->id_hdr_size;
 689                         event->mmap.start = pos->start;
 690                         event->mmap.len   = pos->end - pos->start;
 691                         event->mmap.pid   = machine->pid;
 692
 693                         memcpy(event->mmap.filename, pos->dso->long_name,
 694                                pos->dso->long_name_len + 1);
 695                 }
 696
 697                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 698                         rc = -1;
 699                         break;
 700                 }
 701         }
 702
 703         free(event);
 704         return rc;
 705 }
 706
 707 static int filter_task(const struct dirent *dirent)
 708 {
 709         return isdigit(dirent->d_name[0]);
 710 }
 711
 712 static int __event__synthesize_thread(union perf_event *comm_event,
 713                                       union perf_event *mmap_event,
 714                                       union perf_event *fork_event,
 715                                       union perf_event *namespaces_event,
 716                                       pid_t pid, int full, perf_event__handler_t process,
 717                                       struct perf_tool *tool, struct machine *machine, bool mmap_data)
 718 {
 719         char filename[PATH_MAX];
 720         struct dirent **dirent;
 721         pid_t tgid, ppid;
 722         int rc = 0;
 723         int i, n;
 724
 725         /* special case: only send one comm event using passed in pid */
 726         if (!full) {
 727                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 728                                                    process, machine);
 729
 730                 if (tgid == -1)
 731                         return -1;
 732
 733                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 734                                                       tgid, process, machine) < 0)
 735                         return -1;
 736
 737                 /*
 738                  * send mmap only for thread group leader
 739                  * see thread__init_maps()
 740                  */
 741                 if (pid == tgid &&
 742                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 743                                                        process, machine, mmap_data))
 744                         return -1;
 745
 746                 return 0;
 747         }
 748
 749         if (machine__is_default_guest(machine))
 750                 return 0;
 751
 752         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 753                  machine->root_dir, pid);
 754
 755         n = scandir(filename, &dirent, filter_task, alphasort);
 756         if (n < 0)
 757                 return n;
 758
 759         for (i = 0; i < n; i++) {
 760                 char *end;
 761                 pid_t _pid;
 762                 bool kernel_thread = false;
 763
 764                 _pid = strtol(dirent[i]->d_name, &end, 10);
 765                 if (*end)
 766                         continue;
 767
 768                 rc = -1;
 769                 if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 770                                              &tgid, &ppid, &kernel_thread) != 0)
 771                         break;
 772
 773                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 774                                                 ppid, process, machine) < 0)
 775                         break;
 776
 777                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 778                                                       tgid, process, machine) < 0)
 779                         break;
 780
 781                 /*
 782                  * Send the prepared comm event
 783                  */
 784                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 785                         break;
 786
 787                 rc = 0;
 788                 if (_pid == pid && !kernel_thread) {
 789                         /* process the parent's maps too */
 790                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 791                                                 process, machine, mmap_data);
 792                         if (rc)
 793                                 break;
 794                 }
 795         }
 796
 797         for (i = 0; i < n; i++)
 798                 zfree(&dirent[i]);
 799         free(dirent);
 800
 801         return rc;
 802 }
 803
 804 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 805                                       struct perf_thread_map *threads,
 806                                       perf_event__handler_t process,
 807                                       struct machine *machine,
 808                                       bool mmap_data)
 809 {
 810         union perf_event *comm_event, *mmap_event, *fork_event;
 811         union perf_event *namespaces_event;
 812         int err = -1, thread, j;
 813
 814         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 815         if (comm_event == NULL)
 816                 goto out;
 817
 818         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 819         if (mmap_event == NULL)
 820                 goto out_free_comm;
 821
 822         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 823         if (fork_event == NULL)
 824                 goto out_free_mmap;
 825
 826         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 827                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 828                                   machine->id_hdr_size);
 829         if (namespaces_event == NULL)
 830                 goto out_free_fork;
 831
 832         err = 0;
 833         for (thread = 0; thread < threads->nr; ++thread) {
 834                 if (__event__synthesize_thread(comm_event, mmap_event,
 835                                                fork_event, namespaces_event,
 836                                                perf_thread_map__pid(threads, thread), 0,
 837                                                process, tool, machine,
 838                                                mmap_data)) {
 839                         err = -1;
 840                         break;
 841                 }
 842
 843                 /*
 844                  * comm.pid is set to thread group id by
 845                  * perf_event__synthesize_comm
 846                  */
 847                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 848                         bool need_leader = true;
 849
 850                         /* is thread group leader in thread_map? */
 851                         for (j = 0; j < threads->nr; ++j) {
 852                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 853                                         need_leader = false;
 854                                         break;
 855                                 }
 856                         }
 857
 858                         /* if not, generate events for it */
 859                         if (need_leader &&
 860                             __event__synthesize_thread(comm_event, mmap_event,
 861                                                        fork_event, namespaces_event,
 862                                                        comm_event->comm.pid, 0,
 863                                                        process, tool, machine,
 864                                                        mmap_data)) {
 865                                 err = -1;
 866                                 break;
 867                         }
 868                 }
 869         }
 870         free(namespaces_event);
 871 out_free_fork:
 872         free(fork_event);
 873 out_free_mmap:
 874         free(mmap_event);
 875 out_free_comm:
 876         free(comm_event);
 877 out:
 878         return err;
 879 }
 880
 881 static int __perf_event__synthesize_threads(struct perf_tool *tool,
 882                                             perf_event__handler_t process,
 883                                             struct machine *machine,
 884                                             bool mmap_data,
 885                                             struct dirent **dirent,
 886                                             int start,
 887                                             int num)
 888 {
 889         union perf_event *comm_event, *mmap_event, *fork_event;
 890         union perf_event *namespaces_event;
 891         int err = -1;
 892         char *end;
 893         pid_t pid;
 894         int i;
 895
 896         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 897         if (comm_event == NULL)
 898                 goto out;
 899
 900         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 901         if (mmap_event == NULL)
 902                 goto out_free_comm;
 903
 904         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 905         if (fork_event == NULL)
 906                 goto out_free_mmap;
 907
 908         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 909                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 910                                   machine->id_hdr_size);
 911         if (namespaces_event == NULL)
 912                 goto out_free_fork;
 913
 914         for (i = start; i < start + num; i++) {
 915                 if (!isdigit(dirent[i]->d_name[0]))
 916                         continue;
 917
 918                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 919                 /* only interested in proper numerical dirents */
 920                 if (*end)
 921                         continue;
 922                 /*
 923                  * We may race with exiting thread, so don't stop just because
 924                  * one thread couldn't be synthesized.
 925                  */
 926                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 927                                            namespaces_event, pid, 1, process,
 928                                            tool, machine, mmap_data);
 929         }
 930         err = 0;
 931
 932         free(namespaces_event);
 933 out_free_fork:
 934         free(fork_event);
 935 out_free_mmap:
 936         free(mmap_event);
 937 out_free_comm:
 938         free(comm_event);
 939 out:
 940         return err;
 941 }
 942
 943 struct synthesize_threads_arg {
 944         struct perf_tool *tool;
 945         perf_event__handler_t process;
 946         struct machine *machine;
 947         bool mmap_data;
 948         struct dirent **dirent;
 949         int num;
 950         int start;
 951 };
 952
 953 static void *synthesize_threads_worker(void *arg)
 954 {
 955         struct synthesize_threads_arg *args = arg;
 956
 957         __perf_event__synthesize_threads(args->tool, args->process,
 958                                          args->machine, args->mmap_data,
 959                                          args->dirent,
 960                                          args->start, args->num);
 961         return NULL;
 962 }
 963
 964 int perf_event__synthesize_threads(struct perf_tool *tool,
 965                                    perf_event__handler_t process,
 966                                    struct machine *machine,
 967                                    bool mmap_data,
 968                                    unsigned int nr_threads_synthesize)
 969 {
 970         struct synthesize_threads_arg *args = NULL;
 971         pthread_t *synthesize_threads = NULL;
 972         char proc_path[PATH_MAX];
 973         struct dirent **dirent;
 974         int num_per_thread;
 975         int m, n, i, j;
 976         int thread_nr;
 977         int base = 0;
 978         int err = -1;
 979
 980
 981         if (machine__is_default_guest(machine))
 982                 return 0;
 983
 984         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 985         n = scandir(proc_path, &dirent, filter_task, alphasort);
 986         if (n < 0)
 987                 return err;
 988
 989         if (nr_threads_synthesize == UINT_MAX)
 990                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
 991         else
 992                 thread_nr = nr_threads_synthesize;
 993
 994         if (thread_nr <= 1) {
 995                 err = __perf_event__synthesize_threads(tool, process,
 996                                                        machine, mmap_data,
 997                                                        dirent, base, n);
 998                 goto free_dirent;
 999         }
1000         if (thread_nr > n)
1001                 thread_nr = n;
1002
1003         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1004         if (synthesize_threads == NULL)
1005                 goto free_dirent;
1006
1007         args = calloc(sizeof(*args), thread_nr);
1008         if (args == NULL)
1009                 goto free_threads;
1010
1011         num_per_thread = n / thread_nr;
1012         m = n % thread_nr;
1013         for (i = 0; i < thread_nr; i++) {
1014                 args[i].tool = tool;
1015                 args[i].process = process;
1016                 args[i].machine = machine;
1017                 args[i].mmap_data = mmap_data;
1018                 args[i].dirent = dirent;
1019         }
1020         for (i = 0; i < m; i++) {
1021                 args[i].num = num_per_thread + 1;
1022                 args[i].start = i * args[i].num;
1023         }
1024         if (i != 0)
1025                 base = args[i-1].start + args[i-1].num;
1026         for (j = i; j < thread_nr; j++) {
1027                 args[j].num = num_per_thread;
1028                 args[j].start = base + (j - i) * args[i].num;
1029         }
1030
1031         for (i = 0; i < thread_nr; i++) {
1032                 if (pthread_create(&synthesize_threads[i], NULL,
1033                                    synthesize_threads_worker, &args[i]))
1034                         goto out_join;
1035         }
1036         err = 0;
1037 out_join:
1038         for (i = 0; i < thread_nr; i++)
1039                 pthread_join(synthesize_threads[i], NULL);
1040         free(args);
1041 free_threads:
1042         free(synthesize_threads);
1043 free_dirent:
1044         for (i = 0; i < n; i++)
1045                 zfree(&dirent[i]);
1046         free(dirent);
1047
1048         return err;
1049 }
1050
1051 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1052                                               perf_event__handler_t process __maybe_unused,
1053                                               struct machine *machine __maybe_unused)
1054 {
1055         return 0;
1056 }
1057
1058 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1059                                                 perf_event__handler_t process,
1060                                                 struct machine *machine)
1061 {
1062         union perf_event *event;
1063         size_t size = symbol_conf.buildid_mmap2 ?
1064                         sizeof(event->mmap2) : sizeof(event->mmap);
1065         struct map *map = machine__kernel_map(machine);
1066         struct kmap *kmap;
1067         int err;
1068
1069         if (map == NULL)
1070                 return -1;
1071
1072         kmap = map__kmap(map);
1073         if (!kmap->ref_reloc_sym)
1074                 return -1;
1075
1076         /*
1077          * We should get this from /sys/kernel/sections/.text, but till that is
1078          * available use this, and after it is use this as a fallback for older
1079          * kernels.
1080          */
1081         event = zalloc(size + machine->id_hdr_size);
1082         if (event == NULL) {
1083                 pr_debug("Not enough memory synthesizing mmap event "
1084                          "for kernel modules\n");
1085                 return -1;
1086         }
1087
1088         if (machine__is_host(machine)) {
1089                 /*
1090                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
1091                  * see kernel/perf_event.c __perf_event_mmap
1092                  */
1093                 event->header.misc = PERF_RECORD_MISC_KERNEL;
1094         } else {
1095                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1096         }
1097
1098         if (symbol_conf.buildid_mmap2) {
1099                 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1100                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1101                 size = PERF_ALIGN(size, sizeof(u64));
1102                 event->mmap2.header.type = PERF_RECORD_MMAP2;
1103                 event->mmap2.header.size = (sizeof(event->mmap2) -
1104                                 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1105                 event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1106                 event->mmap2.start = map->start;
1107                 event->mmap2.len   = map->end - event->mmap.start;
1108                 event->mmap2.pid   = machine->pid;
1109
1110                 perf_record_mmap2__read_build_id(&event->mmap2, true);
1111         } else {
1112                 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1113                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1114                 size = PERF_ALIGN(size, sizeof(u64));
1115                 event->mmap.header.type = PERF_RECORD_MMAP;
1116                 event->mmap.header.size = (sizeof(event->mmap) -
1117                                 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1118                 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1119                 event->mmap.start = map->start;
1120                 event->mmap.len   = map->end - event->mmap.start;
1121                 event->mmap.pid   = machine->pid;
1122         }
1123
1124         err = perf_tool__process_synth_event(tool, event, machine, process);
1125         free(event);
1126
1127         return err;
1128 }
1129
1130 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1131                                        perf_event__handler_t process,
1132                                        struct machine *machine)
1133 {
1134         int err;
1135
1136         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1137         if (err < 0)
1138                 return err;
1139
1140         return perf_event__synthesize_extra_kmaps(tool, process, machine);
1141 }
1142
1143 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1144                                       struct perf_thread_map *threads,
1145                                       perf_event__handler_t process,
1146                                       struct machine *machine)
1147 {
1148         union perf_event *event;
1149         int i, err, size;
1150
1151         size  = sizeof(event->thread_map);
1152         size += threads->nr * sizeof(event->thread_map.entries[0]);
1153
1154         event = zalloc(size);
1155         if (!event)
1156                 return -ENOMEM;
1157
1158         event->header.type = PERF_RECORD_THREAD_MAP;
1159         event->header.size = size;
1160         event->thread_map.nr = threads->nr;
1161
1162         for (i = 0; i < threads->nr; i++) {
1163                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1164                 char *comm = perf_thread_map__comm(threads, i);
1165
1166                 if (!comm)
1167                         comm = (char *) "";
1168
1169                 entry->pid = perf_thread_map__pid(threads, i);
1170                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1171         }
1172
1173         err = process(tool, event, NULL, machine);
1174
1175         free(event);
1176         return err;
1177 }
1178
1179 static void synthesize_cpus(struct cpu_map_entries *cpus,
1180                             struct perf_cpu_map *map)
1181 {
1182         int i;
1183
1184         cpus->nr = map->nr;
1185
1186         for (i = 0; i < map->nr; i++)
1187                 cpus->cpu[i] = map->map[i];
1188 }
1189
1190 static void synthesize_mask(struct perf_record_record_cpu_map *mask,
1191                             struct perf_cpu_map *map, int max)
1192 {
1193         int i;
1194
1195         mask->nr = BITS_TO_LONGS(max);
1196         mask->long_size = sizeof(long);
1197
1198         for (i = 0; i < map->nr; i++)
1199                 set_bit(map->map[i], mask->mask);
1200 }
1201
1202 static size_t cpus_size(struct perf_cpu_map *map)
1203 {
1204         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
1205 }
1206
1207 static size_t mask_size(struct perf_cpu_map *map, int *max)
1208 {
1209         int i;
1210
1211         *max = 0;
1212
1213         for (i = 0; i < map->nr; i++) {
1214                 /* bit position of the cpu is + 1 */
1215                 int bit = map->map[i] + 1;
1216
1217                 if (bit > *max)
1218                         *max = bit;
1219         }
1220
1221         return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
1222 }
1223
1224 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max)
1225 {
1226         size_t size_cpus, size_mask;
1227         bool is_dummy = perf_cpu_map__empty(map);
1228
1229         /*
1230          * Both array and mask data have variable size based
1231          * on the number of cpus and their actual values.
1232          * The size of the 'struct perf_record_cpu_map_data' is:
1233          *
1234          *   array = size of 'struct cpu_map_entries' +
1235          *           number of cpus * sizeof(u64)
1236          *
1237          *   mask  = size of 'struct perf_record_record_cpu_map' +
1238          *           maximum cpu bit converted to size of longs
1239          *
1240          * and finally + the size of 'struct perf_record_cpu_map_data'.
1241          */
1242         size_cpus = cpus_size(map);
1243         size_mask = mask_size(map, max);
1244
1245         if (is_dummy || (size_cpus < size_mask)) {
1246                 *size += size_cpus;
1247                 *type  = PERF_CPU_MAP__CPUS;
1248         } else {
1249                 *size += size_mask;
1250                 *type  = PERF_CPU_MAP__MASK;
1251         }
1252
1253         *size += sizeof(struct perf_record_cpu_map_data);
1254         *size = PERF_ALIGN(*size, sizeof(u64));
1255         return zalloc(*size);
1256 }
1257
1258 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map,
1259                               u16 type, int max)
1260 {
1261         data->type = type;
1262
1263         switch (type) {
1264         case PERF_CPU_MAP__CPUS:
1265                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
1266                 break;
1267         case PERF_CPU_MAP__MASK:
1268                 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max);
1269         default:
1270                 break;
1271         }
1272 }
1273
1274 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map)
1275 {
1276         size_t size = sizeof(struct perf_record_cpu_map);
1277         struct perf_record_cpu_map *event;
1278         int max;
1279         u16 type;
1280
1281         event = cpu_map_data__alloc(map, &size, &type, &max);
1282         if (!event)
1283                 return NULL;
1284
1285         event->header.type = PERF_RECORD_CPU_MAP;
1286         event->header.size = size;
1287         event->data.type   = type;
1288
1289         cpu_map_data__synthesize(&event->data, map, type, max);
1290         return event;
1291 }
1292
1293 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1294                                    struct perf_cpu_map *map,
1295                                    perf_event__handler_t process,
1296                                    struct machine *machine)
1297 {
1298         struct perf_record_cpu_map *event;
1299         int err;
1300
1301         event = cpu_map_event__new(map);
1302         if (!event)
1303                 return -ENOMEM;
1304
1305         err = process(tool, (union perf_event *) event, NULL, machine);
1306
1307         free(event);
1308         return err;
1309 }
1310
1311 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1312                                        struct perf_stat_config *config,
1313                                        perf_event__handler_t process,
1314                                        struct machine *machine)
1315 {
1316         struct perf_record_stat_config *event;
1317         int size, i = 0, err;
1318
1319         size  = sizeof(*event);
1320         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1321
1322         event = zalloc(size);
1323         if (!event)
1324                 return -ENOMEM;
1325
1326         event->header.type = PERF_RECORD_STAT_CONFIG;
1327         event->header.size = size;
1328         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1329
1330 #define ADD(__term, __val)                                      \
1331         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1332         event->data[i].val = __val;                             \
1333         i++;
1334
1335         ADD(AGGR_MODE,  config->aggr_mode)
1336         ADD(INTERVAL,   config->interval)
1337         ADD(SCALE,      config->scale)
1338
1339         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1340                   "stat config terms unbalanced\n");
1341 #undef ADD
1342
1343         err = process(tool, (union perf_event *) event, NULL, machine);
1344
1345         free(event);
1346         return err;
1347 }
1348
1349 int perf_event__synthesize_stat(struct perf_tool *tool,
1350                                 u32 cpu, u32 thread, u64 id,
1351                                 struct perf_counts_values *count,
1352                                 perf_event__handler_t process,
1353                                 struct machine *machine)
1354 {
1355         struct perf_record_stat event;
1356
1357         event.header.type = PERF_RECORD_STAT;
1358         event.header.size = sizeof(event);
1359         event.header.misc = 0;
1360
1361         event.id        = id;
1362         event.cpu       = cpu;
1363         event.thread    = thread;
1364         event.val       = count->val;
1365         event.ena       = count->ena;
1366         event.run       = count->run;
1367
1368         return process(tool, (union perf_event *) &event, NULL, machine);
1369 }
1370
1371 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1372                                       u64 evtime, u64 type,
1373                                       perf_event__handler_t process,
1374                                       struct machine *machine)
1375 {
1376         struct perf_record_stat_round event;
1377
1378         event.header.type = PERF_RECORD_STAT_ROUND;
1379         event.header.size = sizeof(event);
1380         event.header.misc = 0;
1381
1382         event.time = evtime;
1383         event.type = type;
1384
1385         return process(tool, (union perf_event *) &event, NULL, machine);
1386 }
1387
1388 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1389 {
1390         size_t sz, result = sizeof(struct perf_record_sample);
1391
1392         if (type & PERF_SAMPLE_IDENTIFIER)
1393                 result += sizeof(u64);
1394
1395         if (type & PERF_SAMPLE_IP)
1396                 result += sizeof(u64);
1397
1398         if (type & PERF_SAMPLE_TID)
1399                 result += sizeof(u64);
1400
1401         if (type & PERF_SAMPLE_TIME)
1402                 result += sizeof(u64);
1403
1404         if (type & PERF_SAMPLE_ADDR)
1405                 result += sizeof(u64);
1406
1407         if (type & PERF_SAMPLE_ID)
1408                 result += sizeof(u64);
1409
1410         if (type & PERF_SAMPLE_STREAM_ID)
1411                 result += sizeof(u64);
1412
1413         if (type & PERF_SAMPLE_CPU)
1414                 result += sizeof(u64);
1415
1416         if (type & PERF_SAMPLE_PERIOD)
1417                 result += sizeof(u64);
1418
1419         if (type & PERF_SAMPLE_READ) {
1420                 result += sizeof(u64);
1421                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1422                         result += sizeof(u64);
1423                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1424                         result += sizeof(u64);
1425                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1426                 if (read_format & PERF_FORMAT_GROUP) {
1427                         sz = sample->read.group.nr *
1428                              sizeof(struct sample_read_value);
1429                         result += sz;
1430                 } else {
1431                         result += sizeof(u64);
1432                 }
1433         }
1434
1435         if (type & PERF_SAMPLE_CALLCHAIN) {
1436                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1437                 result += sz;
1438         }
1439
1440         if (type & PERF_SAMPLE_RAW) {
1441                 result += sizeof(u32);
1442                 result += sample->raw_size;
1443         }
1444
1445         if (type & PERF_SAMPLE_BRANCH_STACK) {
1446                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1447                 /* nr, hw_idx */
1448                 sz += 2 * sizeof(u64);
1449                 result += sz;
1450         }
1451
1452         if (type & PERF_SAMPLE_REGS_USER) {
1453                 if (sample->user_regs.abi) {
1454                         result += sizeof(u64);
1455                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1456                         result += sz;
1457                 } else {
1458                         result += sizeof(u64);
1459                 }
1460         }
1461
1462         if (type & PERF_SAMPLE_STACK_USER) {
1463                 sz = sample->user_stack.size;
1464                 result += sizeof(u64);
1465                 if (sz) {
1466                         result += sz;
1467                         result += sizeof(u64);
1468                 }
1469         }
1470
1471         if (type & PERF_SAMPLE_WEIGHT_TYPE)
1472                 result += sizeof(u64);
1473
1474         if (type & PERF_SAMPLE_DATA_SRC)
1475                 result += sizeof(u64);
1476
1477         if (type & PERF_SAMPLE_TRANSACTION)
1478                 result += sizeof(u64);
1479
1480         if (type & PERF_SAMPLE_REGS_INTR) {
1481                 if (sample->intr_regs.abi) {
1482                         result += sizeof(u64);
1483                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1484                         result += sz;
1485                 } else {
1486                         result += sizeof(u64);
1487                 }
1488         }
1489
1490         if (type & PERF_SAMPLE_PHYS_ADDR)
1491                 result += sizeof(u64);
1492
1493         if (type & PERF_SAMPLE_CGROUP)
1494                 result += sizeof(u64);
1495
1496         if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1497                 result += sizeof(u64);
1498
1499         if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1500                 result += sizeof(u64);
1501
1502         if (type & PERF_SAMPLE_AUX) {
1503                 result += sizeof(u64);
1504                 result += sample->aux_sample.size;
1505         }
1506
1507         return result;
1508 }
1509
1510 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1511                                                __u64 *array, u64 type __maybe_unused)
1512 {
1513         *array = data->weight;
1514 }
1515
1516 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1517                                   const struct perf_sample *sample)
1518 {
1519         __u64 *array;
1520         size_t sz;
1521         /*
1522          * used for cross-endian analysis. See git commit 65014ab3
1523          * for why this goofiness is needed.
1524          */
1525         union u64_swap u;
1526
1527         array = event->sample.array;
1528
1529         if (type & PERF_SAMPLE_IDENTIFIER) {
1530                 *array = sample->id;
1531                 array++;
1532         }
1533
1534         if (type & PERF_SAMPLE_IP) {
1535                 *array = sample->ip;
1536                 array++;
1537         }
1538
1539         if (type & PERF_SAMPLE_TID) {
1540                 u.val32[0] = sample->pid;
1541                 u.val32[1] = sample->tid;
1542                 *array = u.val64;
1543                 array++;
1544         }
1545
1546         if (type & PERF_SAMPLE_TIME) {
1547                 *array = sample->time;
1548                 array++;
1549         }
1550
1551         if (type & PERF_SAMPLE_ADDR) {
1552                 *array = sample->addr;
1553                 array++;
1554         }
1555
1556         if (type & PERF_SAMPLE_ID) {
1557                 *array = sample->id;
1558                 array++;
1559         }
1560
1561         if (type & PERF_SAMPLE_STREAM_ID) {
1562                 *array = sample->stream_id;
1563                 array++;
1564         }
1565
1566         if (type & PERF_SAMPLE_CPU) {
1567                 u.val32[0] = sample->cpu;
1568                 u.val32[1] = 0;
1569                 *array = u.val64;
1570                 array++;
1571         }
1572
1573         if (type & PERF_SAMPLE_PERIOD) {
1574                 *array = sample->period;
1575                 array++;
1576         }
1577
1578         if (type & PERF_SAMPLE_READ) {
1579                 if (read_format & PERF_FORMAT_GROUP)
1580                         *array = sample->read.group.nr;
1581                 else
1582                         *array = sample->read.one.value;
1583                 array++;
1584
1585                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1586                         *array = sample->read.time_enabled;
1587                         array++;
1588                 }
1589
1590                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1591                         *array = sample->read.time_running;
1592                         array++;
1593                 }
1594
1595                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1596                 if (read_format & PERF_FORMAT_GROUP) {
1597                         sz = sample->read.group.nr *
1598                              sizeof(struct sample_read_value);
1599                         memcpy(array, sample->read.group.values, sz);
1600                         array = (void *)array + sz;
1601                 } else {
1602                         *array = sample->read.one.id;
1603                         array++;
1604                 }
1605         }
1606
1607         if (type & PERF_SAMPLE_CALLCHAIN) {
1608                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1609                 memcpy(array, sample->callchain, sz);
1610                 array = (void *)array + sz;
1611         }
1612
1613         if (type & PERF_SAMPLE_RAW) {
1614                 u.val32[0] = sample->raw_size;
1615                 *array = u.val64;
1616                 array = (void *)array + sizeof(u32);
1617
1618                 memcpy(array, sample->raw_data, sample->raw_size);
1619                 array = (void *)array + sample->raw_size;
1620         }
1621
1622         if (type & PERF_SAMPLE_BRANCH_STACK) {
1623                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1624                 /* nr, hw_idx */
1625                 sz += 2 * sizeof(u64);
1626                 memcpy(array, sample->branch_stack, sz);
1627                 array = (void *)array + sz;
1628         }
1629
1630         if (type & PERF_SAMPLE_REGS_USER) {
1631                 if (sample->user_regs.abi) {
1632                         *array++ = sample->user_regs.abi;
1633                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1634                         memcpy(array, sample->user_regs.regs, sz);
1635                         array = (void *)array + sz;
1636                 } else {
1637                         *array++ = 0;
1638                 }
1639         }
1640
1641         if (type & PERF_SAMPLE_STACK_USER) {
1642                 sz = sample->user_stack.size;
1643                 *array++ = sz;
1644                 if (sz) {
1645                         memcpy(array, sample->user_stack.data, sz);
1646                         array = (void *)array + sz;
1647                         *array++ = sz;
1648                 }
1649         }
1650
1651         if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1652                 arch_perf_synthesize_sample_weight(sample, array, type);
1653                 array++;
1654         }
1655
1656         if (type & PERF_SAMPLE_DATA_SRC) {
1657                 *array = sample->data_src;
1658                 array++;
1659         }
1660
1661         if (type & PERF_SAMPLE_TRANSACTION) {
1662                 *array = sample->transaction;
1663                 array++;
1664         }
1665
1666         if (type & PERF_SAMPLE_REGS_INTR) {
1667                 if (sample->intr_regs.abi) {
1668                         *array++ = sample->intr_regs.abi;
1669                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1670                         memcpy(array, sample->intr_regs.regs, sz);
1671                         array = (void *)array + sz;
1672                 } else {
1673                         *array++ = 0;
1674                 }
1675         }
1676
1677         if (type & PERF_SAMPLE_PHYS_ADDR) {
1678                 *array = sample->phys_addr;
1679                 array++;
1680         }
1681
1682         if (type & PERF_SAMPLE_CGROUP) {
1683                 *array = sample->cgroup;
1684                 array++;
1685         }
1686
1687         if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1688                 *array = sample->data_page_size;
1689                 array++;
1690         }
1691
1692         if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1693                 *array = sample->code_page_size;
1694                 array++;
1695         }
1696
1697         if (type & PERF_SAMPLE_AUX) {
1698                 sz = sample->aux_sample.size;
1699                 *array++ = sz;
1700                 memcpy(array, sample->aux_sample.data, sz);
1701                 array = (void *)array + sz;
1702         }
1703
1704         return 0;
1705 }
1706
1707 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1708                                     struct evlist *evlist, struct machine *machine)
1709 {
1710         union perf_event *ev;
1711         struct evsel *evsel;
1712         size_t nr = 0, i = 0, sz, max_nr, n;
1713         int err;
1714
1715         pr_debug2("Synthesizing id index\n");
1716
1717         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) /
1718                  sizeof(struct id_index_entry);
1719
1720         evlist__for_each_entry(evlist, evsel)
1721                 nr += evsel->core.ids;
1722
1723         n = nr > max_nr ? max_nr : nr;
1724         sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry);
1725         ev = zalloc(sz);
1726         if (!ev)
1727                 return -ENOMEM;
1728
1729         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1730         ev->id_index.header.size = sz;
1731         ev->id_index.nr = n;
1732
1733         evlist__for_each_entry(evlist, evsel) {
1734                 u32 j;
1735
1736                 for (j = 0; j < evsel->core.ids; j++) {
1737                         struct id_index_entry *e;
1738                         struct perf_sample_id *sid;
1739
1740                         if (i >= n) {
1741                                 err = process(tool, ev, NULL, machine);
1742                                 if (err)
1743                                         goto out_err;
1744                                 nr -= n;
1745                                 i = 0;
1746                         }
1747
1748                         e = &ev->id_index.entries[i++];
1749
1750                         e->id = evsel->core.id[j];
1751
1752                         sid = evlist__id2sid(evlist, e->id);
1753                         if (!sid) {
1754                                 free(ev);
1755                                 return -ENOENT;
1756                         }
1757
1758                         e->idx = sid->idx;
1759                         e->cpu = sid->cpu;
1760                         e->tid = sid->tid;
1761                 }
1762         }
1763
1764         sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry);
1765         ev->id_index.header.size = sz;
1766         ev->id_index.nr = nr;
1767
1768         err = process(tool, ev, NULL, machine);
1769 out_err:
1770         free(ev);
1771
1772         return err;
1773 }
1774
1775 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1776                                   struct target *target, struct perf_thread_map *threads,
1777                                   perf_event__handler_t process, bool data_mmap,
1778                                   unsigned int nr_threads_synthesize)
1779 {
1780         if (target__has_task(target))
1781                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1782         else if (target__has_cpu(target))
1783                 return perf_event__synthesize_threads(tool, process,
1784                                                       machine, data_mmap,
1785                                                       nr_threads_synthesize);
1786         /* command specified */
1787         return 0;
1788 }
1789
1790 int machine__synthesize_threads(struct machine *machine, struct target *target,
1791                                 struct perf_thread_map *threads, bool data_mmap,
1792                                 unsigned int nr_threads_synthesize)
1793 {
1794         return __machine__synthesize_threads(machine, NULL, target, threads,
1795                                              perf_event__process, data_mmap,
1796                                              nr_threads_synthesize);
1797 }
1798
1799 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1800 {
1801         struct perf_record_event_update *ev;
1802
1803         size += sizeof(*ev);
1804         size  = PERF_ALIGN(size, sizeof(u64));
1805
1806         ev = zalloc(size);
1807         if (ev) {
1808                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1809                 ev->header.size = (u16)size;
1810                 ev->type        = type;
1811                 ev->id          = id;
1812         }
1813         return ev;
1814 }
1815
1816 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1817                                              perf_event__handler_t process)
1818 {
1819         size_t size = strlen(evsel->unit);
1820         struct perf_record_event_update *ev;
1821         int err;
1822
1823         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1824         if (ev == NULL)
1825                 return -ENOMEM;
1826
1827         strlcpy(ev->data, evsel->unit, size + 1);
1828         err = process(tool, (union perf_event *)ev, NULL, NULL);
1829         free(ev);
1830         return err;
1831 }
1832
1833 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1834                                               perf_event__handler_t process)
1835 {
1836         struct perf_record_event_update *ev;
1837         struct perf_record_event_update_scale *ev_data;
1838         int err;
1839
1840         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1841         if (ev == NULL)
1842                 return -ENOMEM;
1843
1844         ev_data = (struct perf_record_event_update_scale *)ev->data;
1845         ev_data->scale = evsel->scale;
1846         err = process(tool, (union perf_event *)ev, NULL, NULL);
1847         free(ev);
1848         return err;
1849 }
1850
1851 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1852                                              perf_event__handler_t process)
1853 {
1854         struct perf_record_event_update *ev;
1855         size_t len = strlen(evsel->name);
1856         int err;
1857
1858         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1859         if (ev == NULL)
1860                 return -ENOMEM;
1861
1862         strlcpy(ev->data, evsel->name, len + 1);
1863         err = process(tool, (union perf_event *)ev, NULL, NULL);
1864         free(ev);
1865         return err;
1866 }
1867
1868 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
1869                                              perf_event__handler_t process)
1870 {
1871         size_t size = sizeof(struct perf_record_event_update);
1872         struct perf_record_event_update *ev;
1873         int max, err;
1874         u16 type;
1875
1876         if (!evsel->core.own_cpus)
1877                 return 0;
1878
1879         ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
1880         if (!ev)
1881                 return -ENOMEM;
1882
1883         ev->header.type = PERF_RECORD_EVENT_UPDATE;
1884         ev->header.size = (u16)size;
1885         ev->type        = PERF_EVENT_UPDATE__CPUS;
1886         ev->id          = evsel->core.id[0];
1887
1888         cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
1889                                  evsel->core.own_cpus, type, max);
1890
1891         err = process(tool, (union perf_event *)ev, NULL, NULL);
1892         free(ev);
1893         return err;
1894 }
1895
1896 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
1897                                  perf_event__handler_t process)
1898 {
1899         struct evsel *evsel;
1900         int err = 0;
1901
1902         evlist__for_each_entry(evlist, evsel) {
1903                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
1904                                                   evsel->core.id, process);
1905                 if (err) {
1906                         pr_debug("failed to create perf header attribute\n");
1907                         return err;
1908                 }
1909         }
1910
1911         return err;
1912 }
1913
1914 static bool has_unit(struct evsel *evsel)
1915 {
1916         return evsel->unit && *evsel->unit;
1917 }
1918
1919 static bool has_scale(struct evsel *evsel)
1920 {
1921         return evsel->scale != 1;
1922 }
1923
1924 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
1925                                       perf_event__handler_t process, bool is_pipe)
1926 {
1927         struct evsel *evsel;
1928         int err;
1929
1930         /*
1931          * Synthesize other events stuff not carried within
1932          * attr event - unit, scale, name
1933          */
1934         evlist__for_each_entry(evsel_list, evsel) {
1935                 if (!evsel->supported)
1936                         continue;
1937
1938                 /*
1939                  * Synthesize unit and scale only if it's defined.
1940                  */
1941                 if (has_unit(evsel)) {
1942                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
1943                         if (err < 0) {
1944                                 pr_err("Couldn't synthesize evsel unit.\n");
1945                                 return err;
1946                         }
1947                 }
1948
1949                 if (has_scale(evsel)) {
1950                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
1951                         if (err < 0) {
1952                                 pr_err("Couldn't synthesize evsel evsel.\n");
1953                                 return err;
1954                         }
1955                 }
1956
1957                 if (evsel->core.own_cpus) {
1958                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
1959                         if (err < 0) {
1960                                 pr_err("Couldn't synthesize evsel cpus.\n");
1961                                 return err;
1962                         }
1963                 }
1964
1965                 /*
1966                  * Name is needed only for pipe output,
1967                  * perf.data carries event names.
1968                  */
1969                 if (is_pipe) {
1970                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
1971                         if (err < 0) {
1972                                 pr_err("Couldn't synthesize evsel name.\n");
1973                                 return err;
1974                         }
1975                 }
1976         }
1977         return 0;
1978 }
1979
1980 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
1981                                 u32 ids, u64 *id, perf_event__handler_t process)
1982 {
1983         union perf_event *ev;
1984         size_t size;
1985         int err;
1986
1987         size = sizeof(struct perf_event_attr);
1988         size = PERF_ALIGN(size, sizeof(u64));
1989         size += sizeof(struct perf_event_header);
1990         size += ids * sizeof(u64);
1991
1992         ev = zalloc(size);
1993
1994         if (ev == NULL)
1995                 return -ENOMEM;
1996
1997         ev->attr.attr = *attr;
1998         memcpy(ev->attr.id, id, ids * sizeof(u64));
1999
2000         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2001         ev->attr.header.size = (u16)size;
2002
2003         if (ev->attr.header.size == size)
2004                 err = process(tool, ev, NULL, NULL);
2005         else
2006                 err = -E2BIG;
2007
2008         free(ev);
2009
2010         return err;
2011 }
2012
2013 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2014                                         perf_event__handler_t process)
2015 {
2016         union perf_event ev;
2017         struct tracing_data *tdata;
2018         ssize_t size = 0, aligned_size = 0, padding;
2019         struct feat_fd ff;
2020
2021         /*
2022          * We are going to store the size of the data followed
2023          * by the data contents. Since the fd descriptor is a pipe,
2024          * we cannot seek back to store the size of the data once
2025          * we know it. Instead we:
2026          *
2027          * - write the tracing data to the temp file
2028          * - get/write the data size to pipe
2029          * - write the tracing data from the temp file
2030          *   to the pipe
2031          */
2032         tdata = tracing_data_get(&evlist->core.entries, fd, true);
2033         if (!tdata)
2034                 return -1;
2035
2036         memset(&ev, 0, sizeof(ev));
2037
2038         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2039         size = tdata->size;
2040         aligned_size = PERF_ALIGN(size, sizeof(u64));
2041         padding = aligned_size - size;
2042         ev.tracing_data.header.size = sizeof(ev.tracing_data);
2043         ev.tracing_data.size = aligned_size;
2044
2045         process(tool, &ev, NULL, NULL);
2046
2047         /*
2048          * The put function will copy all the tracing data
2049          * stored in temp file to the pipe.
2050          */
2051         tracing_data_put(tdata);
2052
2053         ff = (struct feat_fd){ .fd = fd };
2054         if (write_padded(&ff, NULL, 0, padding))
2055                 return -1;
2056
2057         return aligned_size;
2058 }
2059
2060 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2061                                     perf_event__handler_t process, struct machine *machine)
2062 {
2063         union perf_event ev;
2064         size_t len;
2065
2066         if (!pos->hit)
2067                 return 0;
2068
2069         memset(&ev, 0, sizeof(ev));
2070
2071         len = pos->long_name_len + 1;
2072         len = PERF_ALIGN(len, NAME_ALIGN);
2073         memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2074         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2075         ev.build_id.header.misc = misc;
2076         ev.build_id.pid = machine->pid;
2077         ev.build_id.header.size = sizeof(ev.build_id) + len;
2078         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2079
2080         return process(tool, &ev, NULL, machine);
2081 }
2082
2083 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2084                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
2085 {
2086         int err;
2087
2088         if (attrs) {
2089                 err = perf_event__synthesize_attrs(tool, evlist, process);
2090                 if (err < 0) {
2091                         pr_err("Couldn't synthesize attrs.\n");
2092                         return err;
2093                 }
2094         }
2095
2096         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2097         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2098         if (err < 0) {
2099                 pr_err("Couldn't synthesize thread map.\n");
2100                 return err;
2101         }
2102
2103         err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL);
2104         if (err < 0) {
2105                 pr_err("Couldn't synthesize thread map.\n");
2106                 return err;
2107         }
2108
2109         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2110         if (err < 0) {
2111                 pr_err("Couldn't synthesize config.\n");
2112                 return err;
2113         }
2114
2115         return 0;
2116 }
2117
2118 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2119
2120 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2121                                     struct evlist *evlist, perf_event__handler_t process)
2122 {
2123         struct perf_header *header = &session->header;
2124         struct perf_record_header_feature *fe;
2125         struct feat_fd ff;
2126         size_t sz, sz_hdr;
2127         int feat, ret;
2128
2129         sz_hdr = sizeof(fe->header);
2130         sz = sizeof(union perf_event);
2131         /* get a nice alignment */
2132         sz = PERF_ALIGN(sz, page_size);
2133
2134         memset(&ff, 0, sizeof(ff));
2135
2136         ff.buf = malloc(sz);
2137         if (!ff.buf)
2138                 return -ENOMEM;
2139
2140         ff.size = sz - sz_hdr;
2141         ff.ph = &session->header;
2142
2143         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2144                 if (!feat_ops[feat].synthesize) {
2145                         pr_debug("No record header feature for header :%d\n", feat);
2146                         continue;
2147                 }
2148
2149                 ff.offset = sizeof(*fe);
2150
2151                 ret = feat_ops[feat].write(&ff, evlist);
2152                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2153                         pr_debug("Error writing feature\n");
2154                         continue;
2155                 }
2156                 /* ff.buf may have changed due to realloc in do_write() */
2157                 fe = ff.buf;
2158                 memset(fe, 0, sizeof(*fe));
2159
2160                 fe->feat_id = feat;
2161                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
2162                 fe->header.size = ff.offset;
2163
2164                 ret = process(tool, ff.buf, NULL, NULL);
2165                 if (ret) {
2166                         free(ff.buf);
2167                         return ret;
2168                 }
2169         }
2170
2171         /* Send HEADER_LAST_FEATURE mark. */
2172         fe = ff.buf;
2173         fe->feat_id     = HEADER_LAST_FEATURE;
2174         fe->header.type = PERF_RECORD_HEADER_FEATURE;
2175         fe->header.size = sizeof(*fe);
2176
2177         ret = process(tool, ff.buf, NULL, NULL);
2178
2179         free(ff.buf);
2180         return ret;
2181 }