tools/perf/util/synthetic-events.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "util/cgroup.h"
   4 #include "util/data.h"
   5 #include "util/debug.h"
   6 #include "util/dso.h"
   7 #include "util/event.h"
   8 #include "util/evlist.h"
   9 #include "util/machine.h"
  10 #include "util/map.h"
  11 #include "util/map_symbol.h"
  12 #include "util/branch.h"
  13 #include "util/memswap.h"
  14 #include "util/namespaces.h"
  15 #include "util/session.h"
  16 #include "util/stat.h"
  17 #include "util/symbol.h"
  18 #include "util/synthetic-events.h"
  19 #include "util/target.h"
  20 #include "util/time-utils.h"
  21 #include <linux/bitops.h>
  22 #include <linux/kernel.h>
  23 #include <linux/string.h>
  24 #include <linux/zalloc.h>
  25 #include <linux/perf_event.h>
  26 #include <asm/bug.h>
  27 #include <perf/evsel.h>
  28 #include <perf/cpumap.h>
  29 #include <internal/lib.h> // page_size
  30 #include <internal/threadmap.h>
  31 #include <perf/threadmap.h>
  32 #include <symbol/kallsyms.h>
  33 #include <dirent.h>
  34 #include <errno.h>
  35 #include <inttypes.h>
  36 #include <stdio.h>
  37 #include <string.h>
  38 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  39 #include <api/fs/fs.h>
  40 #include <api/io.h>
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #include <fcntl.h>
  44 #include <unistd.h>
  45
  46 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
  47
  48 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
  49
  50 int perf_tool__process_synth_event(struct perf_tool *tool,
  51                                    union perf_event *event,
  52                                    struct machine *machine,
  53                                    perf_event__handler_t process)
  54 {
  55         struct perf_sample synth_sample = {
  56                 .pid       = -1,
  57                 .tid       = -1,
  58                 .time      = -1,
  59                 .stream_id = -1,
  60                 .cpu       = -1,
  61                 .period    = 1,
  62                 .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
  63         };
  64
  65         return process(tool, event, &synth_sample, machine);
  66 };
  67
  68 /*
  69  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  70  * the comm, tgid and ppid.
  71  */
  72 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len,
  73                                     pid_t *tgid, pid_t *ppid, bool *kernel)
  74 {
  75         char bf[4096];
  76         int fd;
  77         size_t size = 0;
  78         ssize_t n;
  79         char *name, *tgids, *ppids, *vmpeak, *threads;
  80
  81         *tgid = -1;
  82         *ppid = -1;
  83
  84         if (pid)
  85                 snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid);
  86         else
  87                 snprintf(bf, sizeof(bf), "/proc/%d/status", tid);
  88
  89         fd = open(bf, O_RDONLY);
  90         if (fd < 0) {
  91                 pr_debug("couldn't open %s\n", bf);
  92                 return -1;
  93         }
  94
  95         n = read(fd, bf, sizeof(bf) - 1);
  96         close(fd);
  97         if (n <= 0) {
  98                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  99                            tid);
 100                 return -1;
 101         }
 102         bf[n] = '\0';
 103
 104         name = strstr(bf, "Name:");
 105         tgids = strstr(name ?: bf, "Tgid:");
 106         ppids = strstr(tgids ?: bf, "PPid:");
 107         vmpeak = strstr(ppids ?: bf, "VmPeak:");
 108
 109         if (vmpeak)
 110                 threads = NULL;
 111         else
 112                 threads = strstr(ppids ?: bf, "Threads:");
 113
 114         if (name) {
 115                 char *nl;
 116
 117                 name = skip_spaces(name + 5);  /* strlen("Name:") */
 118                 nl = strchr(name, '\n');
 119                 if (nl)
 120                         *nl = '\0';
 121
 122                 size = strlen(name);
 123                 if (size >= len)
 124                         size = len - 1;
 125                 memcpy(comm, name, size);
 126                 comm[size] = '\0';
 127         } else {
 128                 pr_debug("Name: string not found for pid %d\n", tid);
 129         }
 130
 131         if (tgids) {
 132                 tgids += 5;  /* strlen("Tgid:") */
 133                 *tgid = atoi(tgids);
 134         } else {
 135                 pr_debug("Tgid: string not found for pid %d\n", tid);
 136         }
 137
 138         if (ppids) {
 139                 ppids += 5;  /* strlen("PPid:") */
 140                 *ppid = atoi(ppids);
 141         } else {
 142                 pr_debug("PPid: string not found for pid %d\n", tid);
 143         }
 144
 145         if (!vmpeak && threads)
 146                 *kernel = true;
 147         else
 148                 *kernel = false;
 149
 150         return 0;
 151 }
 152
 153 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid,
 154                                     struct machine *machine,
 155                                     pid_t *tgid, pid_t *ppid, bool *kernel)
 156 {
 157         size_t size;
 158
 159         *ppid = -1;
 160
 161         memset(&event->comm, 0, sizeof(event->comm));
 162
 163         if (machine__is_host(machine)) {
 164                 if (perf_event__get_comm_ids(pid, tid, event->comm.comm,
 165                                              sizeof(event->comm.comm),
 166                                              tgid, ppid, kernel) != 0) {
 167                         return -1;
 168                 }
 169         } else {
 170                 *tgid = machine->pid;
 171         }
 172
 173         if (*tgid < 0)
 174                 return -1;
 175
 176         event->comm.pid = *tgid;
 177         event->comm.header.type = PERF_RECORD_COMM;
 178
 179         size = strlen(event->comm.comm) + 1;
 180         size = PERF_ALIGN(size, sizeof(u64));
 181         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 182         event->comm.header.size = (sizeof(event->comm) -
 183                                 (sizeof(event->comm.comm) - size) +
 184                                 machine->id_hdr_size);
 185         event->comm.tid = tid;
 186
 187         return 0;
 188 }
 189
 190 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 191                                          union perf_event *event, pid_t pid,
 192                                          perf_event__handler_t process,
 193                                          struct machine *machine)
 194 {
 195         pid_t tgid, ppid;
 196         bool kernel_thread;
 197
 198         if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid,
 199                                      &kernel_thread) != 0)
 200                 return -1;
 201
 202         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 203                 return -1;
 204
 205         return tgid;
 206 }
 207
 208 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
 209                                          struct perf_ns_link_info *ns_link_info)
 210 {
 211         struct stat64 st;
 212         char proc_ns[128];
 213
 214         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
 215         if (stat64(proc_ns, &st) == 0) {
 216                 ns_link_info->dev = st.st_dev;
 217                 ns_link_info->ino = st.st_ino;
 218         }
 219 }
 220
 221 int perf_event__synthesize_namespaces(struct perf_tool *tool,
 222                                       union perf_event *event,
 223                                       pid_t pid, pid_t tgid,
 224                                       perf_event__handler_t process,
 225                                       struct machine *machine)
 226 {
 227         u32 idx;
 228         struct perf_ns_link_info *ns_link_info;
 229
 230         if (!tool || !tool->namespace_events)
 231                 return 0;
 232
 233         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
 234                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 235                machine->id_hdr_size));
 236
 237         event->namespaces.pid = tgid;
 238         event->namespaces.tid = pid;
 239
 240         event->namespaces.nr_namespaces = NR_NAMESPACES;
 241
 242         ns_link_info = event->namespaces.link_info;
 243
 244         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
 245                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
 246                                              &ns_link_info[idx]);
 247
 248         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
 249
 250         event->namespaces.header.size = (sizeof(event->namespaces) +
 251                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 252                         machine->id_hdr_size);
 253
 254         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 255                 return -1;
 256
 257         return 0;
 258 }
 259
 260 static int perf_event__synthesize_fork(struct perf_tool *tool,
 261                                        union perf_event *event,
 262                                        pid_t pid, pid_t tgid, pid_t ppid,
 263                                        perf_event__handler_t process,
 264                                        struct machine *machine)
 265 {
 266         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 267
 268         /*
 269          * for main thread set parent to ppid from status file. For other
 270          * threads set parent pid to main thread. ie., assume main thread
 271          * spawns all threads in a process
 272         */
 273         if (tgid == pid) {
 274                 event->fork.ppid = ppid;
 275                 event->fork.ptid = ppid;
 276         } else {
 277                 event->fork.ppid = tgid;
 278                 event->fork.ptid = tgid;
 279         }
 280         event->fork.pid  = tgid;
 281         event->fork.tid  = pid;
 282         event->fork.header.type = PERF_RECORD_FORK;
 283         event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
 284
 285         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 286
 287         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 288                 return -1;
 289
 290         return 0;
 291 }
 292
 293 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end,
 294                                 u32 *prot, u32 *flags, __u64 *offset,
 295                                 u32 *maj, u32 *min,
 296                                 __u64 *inode,
 297                                 ssize_t pathname_size, char *pathname)
 298 {
 299         __u64 temp;
 300         int ch;
 301         char *start_pathname = pathname;
 302
 303         if (io__get_hex(io, start) != '-')
 304                 return false;
 305         if (io__get_hex(io, end) != ' ')
 306                 return false;
 307
 308         /* map protection and flags bits */
 309         *prot = 0;
 310         ch = io__get_char(io);
 311         if (ch == 'r')
 312                 *prot |= PROT_READ;
 313         else if (ch != '-')
 314                 return false;
 315         ch = io__get_char(io);
 316         if (ch == 'w')
 317                 *prot |= PROT_WRITE;
 318         else if (ch != '-')
 319                 return false;
 320         ch = io__get_char(io);
 321         if (ch == 'x')
 322                 *prot |= PROT_EXEC;
 323         else if (ch != '-')
 324                 return false;
 325         ch = io__get_char(io);
 326         if (ch == 's')
 327                 *flags = MAP_SHARED;
 328         else if (ch == 'p')
 329                 *flags = MAP_PRIVATE;
 330         else
 331                 return false;
 332         if (io__get_char(io) != ' ')
 333                 return false;
 334
 335         if (io__get_hex(io, offset) != ' ')
 336                 return false;
 337
 338         if (io__get_hex(io, &temp) != ':')
 339                 return false;
 340         *maj = temp;
 341         if (io__get_hex(io, &temp) != ' ')
 342                 return false;
 343         *min = temp;
 344
 345         ch = io__get_dec(io, inode);
 346         if (ch != ' ') {
 347                 *pathname = '\0';
 348                 return ch == '\n';
 349         }
 350         do {
 351                 ch = io__get_char(io);
 352         } while (ch == ' ');
 353         while (true) {
 354                 if (ch < 0)
 355                         return false;
 356                 if (ch == '\0' || ch == '\n' ||
 357                     (pathname + 1 - start_pathname) >= pathname_size) {
 358                         *pathname = '\0';
 359                         return true;
 360                 }
 361                 *pathname++ = ch;
 362                 ch = io__get_char(io);
 363         }
 364 }
 365
 366 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event,
 367                                              bool is_kernel)
 368 {
 369         struct build_id bid;
 370         int rc;
 371
 372         if (is_kernel)
 373                 rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
 374         else
 375                 rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
 376
 377         if (rc == 0) {
 378                 memcpy(event->build_id, bid.data, sizeof(bid.data));
 379                 event->build_id_size = (u8) bid.size;
 380                 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
 381                 event->__reserved_1 = 0;
 382                 event->__reserved_2 = 0;
 383         } else {
 384                 if (event->filename[0] == '/') {
 385                         pr_debug2("Failed to read build ID for %s\n",
 386                                   event->filename);
 387                 }
 388         }
 389 }
 390
 391 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 392                                        union perf_event *event,
 393                                        pid_t pid, pid_t tgid,
 394                                        perf_event__handler_t process,
 395                                        struct machine *machine,
 396                                        bool mmap_data)
 397 {
 398         unsigned long long t;
 399         char bf[BUFSIZ];
 400         struct io io;
 401         bool truncation = false;
 402         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 403         int rc = 0;
 404         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 405         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 406
 407         if (machine__is_default_guest(machine))
 408                 return 0;
 409
 410         snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
 411                 machine->root_dir, pid, pid);
 412
 413         io.fd = open(bf, O_RDONLY, 0);
 414         if (io.fd < 0) {
 415                 /*
 416                  * We raced with a task exiting - just return:
 417                  */
 418                 pr_debug("couldn't open %s\n", bf);
 419                 return -1;
 420         }
 421         io__init(&io, io.fd, bf, sizeof(bf));
 422
 423         event->header.type = PERF_RECORD_MMAP2;
 424         t = rdclock();
 425
 426         while (!io.eof) {
 427                 static const char anonstr[] = "//anon";
 428                 size_t size, aligned_size;
 429
 430                 /* ensure null termination since stack will be reused. */
 431                 event->mmap2.filename[0] = '\0';
 432
 433                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 434                 if (!read_proc_maps_line(&io,
 435                                         &event->mmap2.start,
 436                                         &event->mmap2.len,
 437                                         &event->mmap2.prot,
 438                                         &event->mmap2.flags,
 439                                         &event->mmap2.pgoff,
 440                                         &event->mmap2.maj,
 441                                         &event->mmap2.min,
 442                                         &event->mmap2.ino,
 443                                         sizeof(event->mmap2.filename),
 444                                         event->mmap2.filename))
 445                         continue;
 446
 447                 if ((rdclock() - t) > timeout) {
 448                         pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
 449                                    "You may want to increase "
 450                                    "the time limit by --proc-map-timeout\n",
 451                                    machine->root_dir, pid, pid);
 452                         truncation = true;
 453                         goto out;
 454                 }
 455
 456                 event->mmap2.ino_generation = 0;
 457
 458                 /*
 459                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 460                  */
 461                 if (machine__is_host(machine))
 462                         event->header.misc = PERF_RECORD_MISC_USER;
 463                 else
 464                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 465
 466                 if ((event->mmap2.prot & PROT_EXEC) == 0) {
 467                         if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
 468                                 continue;
 469
 470                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 471                 }
 472
 473 out:
 474                 if (truncation)
 475                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 476
 477                 if (!strcmp(event->mmap2.filename, ""))
 478                         strcpy(event->mmap2.filename, anonstr);
 479
 480                 if (hugetlbfs_mnt_len &&
 481                     !strncmp(event->mmap2.filename, hugetlbfs_mnt,
 482                              hugetlbfs_mnt_len)) {
 483                         strcpy(event->mmap2.filename, anonstr);
 484                         event->mmap2.flags |= MAP_HUGETLB;
 485                 }
 486
 487                 size = strlen(event->mmap2.filename) + 1;
 488                 aligned_size = PERF_ALIGN(size, sizeof(u64));
 489                 event->mmap2.len -= event->mmap.start;
 490                 event->mmap2.header.size = (sizeof(event->mmap2) -
 491                                         (sizeof(event->mmap2.filename) - aligned_size));
 492                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
 493                         (aligned_size - size));
 494                 event->mmap2.header.size += machine->id_hdr_size;
 495                 event->mmap2.pid = tgid;
 496                 event->mmap2.tid = pid;
 497
 498                 if (symbol_conf.buildid_mmap2)
 499                         perf_record_mmap2__read_build_id(&event->mmap2, false);
 500
 501                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 502                         rc = -1;
 503                         break;
 504                 }
 505
 506                 if (truncation)
 507                         break;
 508         }
 509
 510         close(io.fd);
 511         return rc;
 512 }
 513
 514 #ifdef HAVE_FILE_HANDLE
 515 static int perf_event__synthesize_cgroup(struct perf_tool *tool,
 516                                          union perf_event *event,
 517                                          char *path, size_t mount_len,
 518                                          perf_event__handler_t process,
 519                                          struct machine *machine)
 520 {
 521         size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
 522         size_t path_len = strlen(path) - mount_len + 1;
 523         struct {
 524                 struct file_handle fh;
 525                 uint64_t cgroup_id;
 526         } handle;
 527         int mount_id;
 528
 529         while (path_len % sizeof(u64))
 530                 path[mount_len + path_len++] = '\0';
 531
 532         memset(&event->cgroup, 0, event_size);
 533
 534         event->cgroup.header.type = PERF_RECORD_CGROUP;
 535         event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
 536
 537         handle.fh.handle_bytes = sizeof(handle.cgroup_id);
 538         if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
 539                 pr_debug("stat failed: %s\n", path);
 540                 return -1;
 541         }
 542
 543         event->cgroup.id = handle.cgroup_id;
 544         strncpy(event->cgroup.path, path + mount_len, path_len);
 545         memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
 546
 547         if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
 548                 pr_debug("process synth event failed\n");
 549                 return -1;
 550         }
 551
 552         return 0;
 553 }
 554
 555 static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
 556                                         union perf_event *event,
 557                                         char *path, size_t mount_len,
 558                                         perf_event__handler_t process,
 559                                         struct machine *machine)
 560 {
 561         size_t pos = strlen(path);
 562         DIR *d;
 563         struct dirent *dent;
 564         int ret = 0;
 565
 566         if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
 567                                           process, machine) < 0)
 568                 return -1;
 569
 570         d = opendir(path);
 571         if (d == NULL) {
 572                 pr_debug("failed to open directory: %s\n", path);
 573                 return -1;
 574         }
 575
 576         while ((dent = readdir(d)) != NULL) {
 577                 if (dent->d_type != DT_DIR)
 578                         continue;
 579                 if (!strcmp(dent->d_name, ".") ||
 580                     !strcmp(dent->d_name, ".."))
 581                         continue;
 582
 583                 /* any sane path should be less than PATH_MAX */
 584                 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
 585                         continue;
 586
 587                 if (path[pos - 1] != '/')
 588                         strcat(path, "/");
 589                 strcat(path, dent->d_name);
 590
 591                 ret = perf_event__walk_cgroup_tree(tool, event, path,
 592                                                    mount_len, process, machine);
 593                 if (ret < 0)
 594                         break;
 595
 596                 path[pos] = '\0';
 597         }
 598
 599         closedir(d);
 600         return ret;
 601 }
 602
 603 int perf_event__synthesize_cgroups(struct perf_tool *tool,
 604                                    perf_event__handler_t process,
 605                                    struct machine *machine)
 606 {
 607         union perf_event event;
 608         char cgrp_root[PATH_MAX];
 609         size_t mount_len;  /* length of mount point in the path */
 610
 611         if (!tool || !tool->cgroup_events)
 612                 return 0;
 613
 614         if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
 615                 pr_debug("cannot find cgroup mount point\n");
 616                 return -1;
 617         }
 618
 619         mount_len = strlen(cgrp_root);
 620         /* make sure the path starts with a slash (after mount point) */
 621         strcat(cgrp_root, "/");
 622
 623         if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
 624                                          process, machine) < 0)
 625                 return -1;
 626
 627         return 0;
 628 }
 629 #else
 630 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
 631                                    perf_event__handler_t process __maybe_unused,
 632                                    struct machine *machine __maybe_unused)
 633 {
 634         return -1;
 635 }
 636 #endif
 637
 638 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 639                                    struct machine *machine)
 640 {
 641         int rc = 0;
 642         struct map *pos;
 643         struct maps *maps = machine__kernel_maps(machine);
 644         union perf_event *event;
 645         size_t size = symbol_conf.buildid_mmap2 ?
 646                         sizeof(event->mmap2) : sizeof(event->mmap);
 647
 648         event = zalloc(size + machine->id_hdr_size);
 649         if (event == NULL) {
 650                 pr_debug("Not enough memory synthesizing mmap event "
 651                          "for kernel modules\n");
 652                 return -1;
 653         }
 654
 655         /*
 656          * kernel uses 0 for user space maps, see kernel/perf_event.c
 657          * __perf_event_mmap
 658          */
 659         if (machine__is_host(machine))
 660                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 661         else
 662                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 663
 664         maps__for_each_entry(maps, pos) {
 665                 if (!__map__is_kmodule(pos))
 666                         continue;
 667
 668                 if (symbol_conf.buildid_mmap2) {
 669                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 670                         event->mmap2.header.type = PERF_RECORD_MMAP2;
 671                         event->mmap2.header.size = (sizeof(event->mmap2) -
 672                                                 (sizeof(event->mmap2.filename) - size));
 673                         memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 674                         event->mmap2.header.size += machine->id_hdr_size;
 675                         event->mmap2.start = pos->start;
 676                         event->mmap2.len   = pos->end - pos->start;
 677                         event->mmap2.pid   = machine->pid;
 678
 679                         memcpy(event->mmap2.filename, pos->dso->long_name,
 680                                pos->dso->long_name_len + 1);
 681
 682                         perf_record_mmap2__read_build_id(&event->mmap2, false);
 683                 } else {
 684                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 685                         event->mmap.header.type = PERF_RECORD_MMAP;
 686                         event->mmap.header.size = (sizeof(event->mmap) -
 687                                                 (sizeof(event->mmap.filename) - size));
 688                         memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 689                         event->mmap.header.size += machine->id_hdr_size;
 690                         event->mmap.start = pos->start;
 691                         event->mmap.len   = pos->end - pos->start;
 692                         event->mmap.pid   = machine->pid;
 693
 694                         memcpy(event->mmap.filename, pos->dso->long_name,
 695                                pos->dso->long_name_len + 1);
 696                 }
 697
 698                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 699                         rc = -1;
 700                         break;
 701                 }
 702         }
 703
 704         free(event);
 705         return rc;
 706 }
 707
 708 static int filter_task(const struct dirent *dirent)
 709 {
 710         return isdigit(dirent->d_name[0]);
 711 }
 712
 713 static int __event__synthesize_thread(union perf_event *comm_event,
 714                                       union perf_event *mmap_event,
 715                                       union perf_event *fork_event,
 716                                       union perf_event *namespaces_event,
 717                                       pid_t pid, int full, perf_event__handler_t process,
 718                                       struct perf_tool *tool, struct machine *machine,
 719                                       bool needs_mmap, bool mmap_data)
 720 {
 721         char filename[PATH_MAX];
 722         struct dirent **dirent;
 723         pid_t tgid, ppid;
 724         int rc = 0;
 725         int i, n;
 726
 727         /* special case: only send one comm event using passed in pid */
 728         if (!full) {
 729                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 730                                                    process, machine);
 731
 732                 if (tgid == -1)
 733                         return -1;
 734
 735                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 736                                                       tgid, process, machine) < 0)
 737                         return -1;
 738
 739                 /*
 740                  * send mmap only for thread group leader
 741                  * see thread__init_maps()
 742                  */
 743                 if (pid == tgid && needs_mmap &&
 744                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 745                                                        process, machine, mmap_data))
 746                         return -1;
 747
 748                 return 0;
 749         }
 750
 751         if (machine__is_default_guest(machine))
 752                 return 0;
 753
 754         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 755                  machine->root_dir, pid);
 756
 757         n = scandir(filename, &dirent, filter_task, NULL);
 758         if (n < 0)
 759                 return n;
 760
 761         for (i = 0; i < n; i++) {
 762                 char *end;
 763                 pid_t _pid;
 764                 bool kernel_thread = false;
 765
 766                 _pid = strtol(dirent[i]->d_name, &end, 10);
 767                 if (*end)
 768                         continue;
 769
 770                 /* some threads may exit just after scan, ignore it */
 771                 if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 772                                              &tgid, &ppid, &kernel_thread) != 0)
 773                         continue;
 774
 775                 rc = -1;
 776                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 777                                                 ppid, process, machine) < 0)
 778                         break;
 779
 780                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 781                                                       tgid, process, machine) < 0)
 782                         break;
 783
 784                 /*
 785                  * Send the prepared comm event
 786                  */
 787                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 788                         break;
 789
 790                 rc = 0;
 791                 if (_pid == pid && !kernel_thread && needs_mmap) {
 792                         /* process the parent's maps too */
 793                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 794                                                 process, machine, mmap_data);
 795                         if (rc)
 796                                 break;
 797                 }
 798         }
 799
 800         for (i = 0; i < n; i++)
 801                 zfree(&dirent[i]);
 802         free(dirent);
 803
 804         return rc;
 805 }
 806
 807 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 808                                       struct perf_thread_map *threads,
 809                                       perf_event__handler_t process,
 810                                       struct machine *machine,
 811                                       bool needs_mmap, bool mmap_data)
 812 {
 813         union perf_event *comm_event, *mmap_event, *fork_event;
 814         union perf_event *namespaces_event;
 815         int err = -1, thread, j;
 816
 817         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 818         if (comm_event == NULL)
 819                 goto out;
 820
 821         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 822         if (mmap_event == NULL)
 823                 goto out_free_comm;
 824
 825         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 826         if (fork_event == NULL)
 827                 goto out_free_mmap;
 828
 829         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 830                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 831                                   machine->id_hdr_size);
 832         if (namespaces_event == NULL)
 833                 goto out_free_fork;
 834
 835         err = 0;
 836         for (thread = 0; thread < threads->nr; ++thread) {
 837                 if (__event__synthesize_thread(comm_event, mmap_event,
 838                                                fork_event, namespaces_event,
 839                                                perf_thread_map__pid(threads, thread), 0,
 840                                                process, tool, machine,
 841                                                needs_mmap, mmap_data)) {
 842                         err = -1;
 843                         break;
 844                 }
 845
 846                 /*
 847                  * comm.pid is set to thread group id by
 848                  * perf_event__synthesize_comm
 849                  */
 850                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 851                         bool need_leader = true;
 852
 853                         /* is thread group leader in thread_map? */
 854                         for (j = 0; j < threads->nr; ++j) {
 855                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 856                                         need_leader = false;
 857                                         break;
 858                                 }
 859                         }
 860
 861                         /* if not, generate events for it */
 862                         if (need_leader &&
 863                             __event__synthesize_thread(comm_event, mmap_event,
 864                                                        fork_event, namespaces_event,
 865                                                        comm_event->comm.pid, 0,
 866                                                        process, tool, machine,
 867                                                        needs_mmap, mmap_data)) {
 868                                 err = -1;
 869                                 break;
 870                         }
 871                 }
 872         }
 873         free(namespaces_event);
 874 out_free_fork:
 875         free(fork_event);
 876 out_free_mmap:
 877         free(mmap_event);
 878 out_free_comm:
 879         free(comm_event);
 880 out:
 881         return err;
 882 }
 883
 884 static int __perf_event__synthesize_threads(struct perf_tool *tool,
 885                                             perf_event__handler_t process,
 886                                             struct machine *machine,
 887                                             bool needs_mmap,
 888                                             bool mmap_data,
 889                                             struct dirent **dirent,
 890                                             int start,
 891                                             int num)
 892 {
 893         union perf_event *comm_event, *mmap_event, *fork_event;
 894         union perf_event *namespaces_event;
 895         int err = -1;
 896         char *end;
 897         pid_t pid;
 898         int i;
 899
 900         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 901         if (comm_event == NULL)
 902                 goto out;
 903
 904         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 905         if (mmap_event == NULL)
 906                 goto out_free_comm;
 907
 908         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 909         if (fork_event == NULL)
 910                 goto out_free_mmap;
 911
 912         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 913                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 914                                   machine->id_hdr_size);
 915         if (namespaces_event == NULL)
 916                 goto out_free_fork;
 917
 918         for (i = start; i < start + num; i++) {
 919                 if (!isdigit(dirent[i]->d_name[0]))
 920                         continue;
 921
 922                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 923                 /* only interested in proper numerical dirents */
 924                 if (*end)
 925                         continue;
 926                 /*
 927                  * We may race with exiting thread, so don't stop just because
 928                  * one thread couldn't be synthesized.
 929                  */
 930                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 931                                            namespaces_event, pid, 1, process,
 932                                            tool, machine, needs_mmap, mmap_data);
 933         }
 934         err = 0;
 935
 936         free(namespaces_event);
 937 out_free_fork:
 938         free(fork_event);
 939 out_free_mmap:
 940         free(mmap_event);
 941 out_free_comm:
 942         free(comm_event);
 943 out:
 944         return err;
 945 }
 946
 947 struct synthesize_threads_arg {
 948         struct perf_tool *tool;
 949         perf_event__handler_t process;
 950         struct machine *machine;
 951         bool needs_mmap;
 952         bool mmap_data;
 953         struct dirent **dirent;
 954         int num;
 955         int start;
 956 };
 957
 958 static void *synthesize_threads_worker(void *arg)
 959 {
 960         struct synthesize_threads_arg *args = arg;
 961
 962         __perf_event__synthesize_threads(args->tool, args->process,
 963                                          args->machine,
 964                                          args->needs_mmap, args->mmap_data,
 965                                          args->dirent,
 966                                          args->start, args->num);
 967         return NULL;
 968 }
 969
 970 int perf_event__synthesize_threads(struct perf_tool *tool,
 971                                    perf_event__handler_t process,
 972                                    struct machine *machine,
 973                                    bool needs_mmap, bool mmap_data,
 974                                    unsigned int nr_threads_synthesize)
 975 {
 976         struct synthesize_threads_arg *args = NULL;
 977         pthread_t *synthesize_threads = NULL;
 978         char proc_path[PATH_MAX];
 979         struct dirent **dirent;
 980         int num_per_thread;
 981         int m, n, i, j;
 982         int thread_nr;
 983         int base = 0;
 984         int err = -1;
 985
 986
 987         if (machine__is_default_guest(machine))
 988                 return 0;
 989
 990         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 991         n = scandir(proc_path, &dirent, filter_task, NULL);
 992         if (n < 0)
 993                 return err;
 994
 995         if (nr_threads_synthesize == UINT_MAX)
 996                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
 997         else
 998                 thread_nr = nr_threads_synthesize;
 999
1000         if (thread_nr <= 1) {
1001                 err = __perf_event__synthesize_threads(tool, process,
1002                                                        machine,
1003                                                        needs_mmap, mmap_data,
1004                                                        dirent, base, n);
1005                 goto free_dirent;
1006         }
1007         if (thread_nr > n)
1008                 thread_nr = n;
1009
1010         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1011         if (synthesize_threads == NULL)
1012                 goto free_dirent;
1013
1014         args = calloc(sizeof(*args), thread_nr);
1015         if (args == NULL)
1016                 goto free_threads;
1017
1018         num_per_thread = n / thread_nr;
1019         m = n % thread_nr;
1020         for (i = 0; i < thread_nr; i++) {
1021                 args[i].tool = tool;
1022                 args[i].process = process;
1023                 args[i].machine = machine;
1024                 args[i].needs_mmap = needs_mmap;
1025                 args[i].mmap_data = mmap_data;
1026                 args[i].dirent = dirent;
1027         }
1028         for (i = 0; i < m; i++) {
1029                 args[i].num = num_per_thread + 1;
1030                 args[i].start = i * args[i].num;
1031         }
1032         if (i != 0)
1033                 base = args[i-1].start + args[i-1].num;
1034         for (j = i; j < thread_nr; j++) {
1035                 args[j].num = num_per_thread;
1036                 args[j].start = base + (j - i) * args[i].num;
1037         }
1038
1039         for (i = 0; i < thread_nr; i++) {
1040                 if (pthread_create(&synthesize_threads[i], NULL,
1041                                    synthesize_threads_worker, &args[i]))
1042                         goto out_join;
1043         }
1044         err = 0;
1045 out_join:
1046         for (i = 0; i < thread_nr; i++)
1047                 pthread_join(synthesize_threads[i], NULL);
1048         free(args);
1049 free_threads:
1050         free(synthesize_threads);
1051 free_dirent:
1052         for (i = 0; i < n; i++)
1053                 zfree(&dirent[i]);
1054         free(dirent);
1055
1056         return err;
1057 }
1058
1059 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1060                                               perf_event__handler_t process __maybe_unused,
1061                                               struct machine *machine __maybe_unused)
1062 {
1063         return 0;
1064 }
1065
1066 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1067                                                 perf_event__handler_t process,
1068                                                 struct machine *machine)
1069 {
1070         union perf_event *event;
1071         size_t size = symbol_conf.buildid_mmap2 ?
1072                         sizeof(event->mmap2) : sizeof(event->mmap);
1073         struct map *map = machine__kernel_map(machine);
1074         struct kmap *kmap;
1075         int err;
1076
1077         if (map == NULL)
1078                 return -1;
1079
1080         kmap = map__kmap(map);
1081         if (!kmap->ref_reloc_sym)
1082                 return -1;
1083
1084         /*
1085          * We should get this from /sys/kernel/sections/.text, but till that is
1086          * available use this, and after it is use this as a fallback for older
1087          * kernels.
1088          */
1089         event = zalloc(size + machine->id_hdr_size);
1090         if (event == NULL) {
1091                 pr_debug("Not enough memory synthesizing mmap event "
1092                          "for kernel modules\n");
1093                 return -1;
1094         }
1095
1096         if (machine__is_host(machine)) {
1097                 /*
1098                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
1099                  * see kernel/perf_event.c __perf_event_mmap
1100                  */
1101                 event->header.misc = PERF_RECORD_MISC_KERNEL;
1102         } else {
1103                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1104         }
1105
1106         if (symbol_conf.buildid_mmap2) {
1107                 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1108                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1109                 size = PERF_ALIGN(size, sizeof(u64));
1110                 event->mmap2.header.type = PERF_RECORD_MMAP2;
1111                 event->mmap2.header.size = (sizeof(event->mmap2) -
1112                                 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1113                 event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1114                 event->mmap2.start = map->start;
1115                 event->mmap2.len   = map->end - event->mmap.start;
1116                 event->mmap2.pid   = machine->pid;
1117
1118                 perf_record_mmap2__read_build_id(&event->mmap2, true);
1119         } else {
1120                 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1121                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1122                 size = PERF_ALIGN(size, sizeof(u64));
1123                 event->mmap.header.type = PERF_RECORD_MMAP;
1124                 event->mmap.header.size = (sizeof(event->mmap) -
1125                                 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1126                 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1127                 event->mmap.start = map->start;
1128                 event->mmap.len   = map->end - event->mmap.start;
1129                 event->mmap.pid   = machine->pid;
1130         }
1131
1132         err = perf_tool__process_synth_event(tool, event, machine, process);
1133         free(event);
1134
1135         return err;
1136 }
1137
1138 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1139                                        perf_event__handler_t process,
1140                                        struct machine *machine)
1141 {
1142         int err;
1143
1144         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1145         if (err < 0)
1146                 return err;
1147
1148         return perf_event__synthesize_extra_kmaps(tool, process, machine);
1149 }
1150
1151 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1152                                       struct perf_thread_map *threads,
1153                                       perf_event__handler_t process,
1154                                       struct machine *machine)
1155 {
1156         union perf_event *event;
1157         int i, err, size;
1158
1159         size  = sizeof(event->thread_map);
1160         size += threads->nr * sizeof(event->thread_map.entries[0]);
1161
1162         event = zalloc(size);
1163         if (!event)
1164                 return -ENOMEM;
1165
1166         event->header.type = PERF_RECORD_THREAD_MAP;
1167         event->header.size = size;
1168         event->thread_map.nr = threads->nr;
1169
1170         for (i = 0; i < threads->nr; i++) {
1171                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1172                 char *comm = perf_thread_map__comm(threads, i);
1173
1174                 if (!comm)
1175                         comm = (char *) "";
1176
1177                 entry->pid = perf_thread_map__pid(threads, i);
1178                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1179         }
1180
1181         err = process(tool, event, NULL, machine);
1182
1183         free(event);
1184         return err;
1185 }
1186
1187 static void synthesize_cpus(struct perf_record_cpu_map_data *data,
1188                             const struct perf_cpu_map *map)
1189 {
1190         int i, map_nr = perf_cpu_map__nr(map);
1191
1192         data->cpus_data.nr = map_nr;
1193
1194         for (i = 0; i < map_nr; i++)
1195                 data->cpus_data.cpu[i] = perf_cpu_map__cpu(map, i).cpu;
1196 }
1197
1198 static void synthesize_mask(struct perf_record_cpu_map_data *data,
1199                             const struct perf_cpu_map *map, int max)
1200 {
1201         int idx;
1202         struct perf_cpu cpu;
1203
1204         /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1205         data->mask32_data.nr = BITS_TO_U32(max);
1206         data->mask32_data.long_size = 4;
1207
1208         perf_cpu_map__for_each_cpu(cpu, idx, map) {
1209                 int bit_word = cpu.cpu / 32;
1210                 __u32 bit_mask = 1U << (cpu.cpu & 31);
1211
1212                 data->mask32_data.mask[bit_word] |= bit_mask;
1213         }
1214 }
1215
1216 static size_t cpus_size(const struct perf_cpu_map *map)
1217 {
1218         return sizeof(struct cpu_map_entries) + perf_cpu_map__nr(map) * sizeof(u16);
1219 }
1220
1221 static size_t mask_size(const struct perf_cpu_map *map, int *max)
1222 {
1223         *max = perf_cpu_map__max(map).cpu;
1224         return sizeof(struct perf_record_mask_cpu_map32) + BITS_TO_U32(*max) * sizeof(__u32);
1225 }
1226
1227 static void *cpu_map_data__alloc(const struct perf_cpu_map *map, size_t *size,
1228                                  u16 *type, int *max)
1229 {
1230         size_t size_cpus, size_mask;
1231         bool is_dummy = perf_cpu_map__empty(map);
1232
1233         /*
1234          * Both array and mask data have variable size based
1235          * on the number of cpus and their actual values.
1236          * The size of the 'struct perf_record_cpu_map_data' is:
1237          *
1238          *   array = size of 'struct cpu_map_entries' +
1239          *           number of cpus * sizeof(u64)
1240          *
1241          *   mask  = size of 'struct perf_record_record_cpu_map' +
1242          *           maximum cpu bit converted to size of longs
1243          *
1244          * and finally + the size of 'struct perf_record_cpu_map_data'.
1245          */
1246         size_cpus = cpus_size(map);
1247         size_mask = mask_size(map, max);
1248
1249         if (is_dummy || (size_cpus < size_mask)) {
1250                 *size += size_cpus;
1251                 *type  = PERF_CPU_MAP__CPUS;
1252         } else {
1253                 *size += size_mask;
1254                 *type  = PERF_CPU_MAP__MASK;
1255         }
1256
1257         *size += sizeof(__u16); /* For perf_record_cpu_map_data.type. */
1258         *size = PERF_ALIGN(*size, sizeof(u64));
1259         return zalloc(*size);
1260 }
1261
1262 static void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data,
1263                                      const struct perf_cpu_map *map,
1264                                      u16 type, int max)
1265 {
1266         data->type = type;
1267
1268         switch (type) {
1269         case PERF_CPU_MAP__CPUS:
1270                 synthesize_cpus(data, map);
1271                 break;
1272         case PERF_CPU_MAP__MASK:
1273                 synthesize_mask(data, map, max);
1274         default:
1275                 break;
1276         }
1277 }
1278
1279 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1280 {
1281         size_t size = sizeof(struct perf_event_header);
1282         struct perf_record_cpu_map *event;
1283         int max;
1284         u16 type;
1285
1286         event = cpu_map_data__alloc(map, &size, &type, &max);
1287         if (!event)
1288                 return NULL;
1289
1290         event->header.type = PERF_RECORD_CPU_MAP;
1291         event->header.size = size;
1292         event->data.type   = type;
1293
1294         cpu_map_data__synthesize(&event->data, map, type, max);
1295         return event;
1296 }
1297
1298 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1299                                    const struct perf_cpu_map *map,
1300                                    perf_event__handler_t process,
1301                                    struct machine *machine)
1302 {
1303         struct perf_record_cpu_map *event;
1304         int err;
1305
1306         event = cpu_map_event__new(map);
1307         if (!event)
1308                 return -ENOMEM;
1309
1310         err = process(tool, (union perf_event *) event, NULL, machine);
1311
1312         free(event);
1313         return err;
1314 }
1315
1316 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1317                                        struct perf_stat_config *config,
1318                                        perf_event__handler_t process,
1319                                        struct machine *machine)
1320 {
1321         struct perf_record_stat_config *event;
1322         int size, i = 0, err;
1323
1324         size  = sizeof(*event);
1325         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1326
1327         event = zalloc(size);
1328         if (!event)
1329                 return -ENOMEM;
1330
1331         event->header.type = PERF_RECORD_STAT_CONFIG;
1332         event->header.size = size;
1333         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1334
1335 #define ADD(__term, __val)                                      \
1336         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1337         event->data[i].val = __val;                             \
1338         i++;
1339
1340         ADD(AGGR_MODE,  config->aggr_mode)
1341         ADD(INTERVAL,   config->interval)
1342         ADD(SCALE,      config->scale)
1343
1344         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1345                   "stat config terms unbalanced\n");
1346 #undef ADD
1347
1348         err = process(tool, (union perf_event *) event, NULL, machine);
1349
1350         free(event);
1351         return err;
1352 }
1353
1354 int perf_event__synthesize_stat(struct perf_tool *tool,
1355                                 struct perf_cpu cpu, u32 thread, u64 id,
1356                                 struct perf_counts_values *count,
1357                                 perf_event__handler_t process,
1358                                 struct machine *machine)
1359 {
1360         struct perf_record_stat event;
1361
1362         event.header.type = PERF_RECORD_STAT;
1363         event.header.size = sizeof(event);
1364         event.header.misc = 0;
1365
1366         event.id        = id;
1367         event.cpu       = cpu.cpu;
1368         event.thread    = thread;
1369         event.val       = count->val;
1370         event.ena       = count->ena;
1371         event.run       = count->run;
1372
1373         return process(tool, (union perf_event *) &event, NULL, machine);
1374 }
1375
1376 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1377                                       u64 evtime, u64 type,
1378                                       perf_event__handler_t process,
1379                                       struct machine *machine)
1380 {
1381         struct perf_record_stat_round event;
1382
1383         event.header.type = PERF_RECORD_STAT_ROUND;
1384         event.header.size = sizeof(event);
1385         event.header.misc = 0;
1386
1387         event.time = evtime;
1388         event.type = type;
1389
1390         return process(tool, (union perf_event *) &event, NULL, machine);
1391 }
1392
1393 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1394 {
1395         size_t sz, result = sizeof(struct perf_record_sample);
1396
1397         if (type & PERF_SAMPLE_IDENTIFIER)
1398                 result += sizeof(u64);
1399
1400         if (type & PERF_SAMPLE_IP)
1401                 result += sizeof(u64);
1402
1403         if (type & PERF_SAMPLE_TID)
1404                 result += sizeof(u64);
1405
1406         if (type & PERF_SAMPLE_TIME)
1407                 result += sizeof(u64);
1408
1409         if (type & PERF_SAMPLE_ADDR)
1410                 result += sizeof(u64);
1411
1412         if (type & PERF_SAMPLE_ID)
1413                 result += sizeof(u64);
1414
1415         if (type & PERF_SAMPLE_STREAM_ID)
1416                 result += sizeof(u64);
1417
1418         if (type & PERF_SAMPLE_CPU)
1419                 result += sizeof(u64);
1420
1421         if (type & PERF_SAMPLE_PERIOD)
1422                 result += sizeof(u64);
1423
1424         if (type & PERF_SAMPLE_READ) {
1425                 result += sizeof(u64);
1426                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1427                         result += sizeof(u64);
1428                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1429                         result += sizeof(u64);
1430                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1431                 if (read_format & PERF_FORMAT_GROUP) {
1432                         sz = sample_read_value_size(read_format);
1433                         result += sz * sample->read.group.nr;
1434                 } else {
1435                         result += sizeof(u64);
1436                         if (read_format & PERF_FORMAT_LOST)
1437                                 result += sizeof(u64);
1438                 }
1439         }
1440
1441         if (type & PERF_SAMPLE_CALLCHAIN) {
1442                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1443                 result += sz;
1444         }
1445
1446         if (type & PERF_SAMPLE_RAW) {
1447                 result += sizeof(u32);
1448                 result += sample->raw_size;
1449         }
1450
1451         if (type & PERF_SAMPLE_BRANCH_STACK) {
1452                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1453                 /* nr, hw_idx */
1454                 sz += 2 * sizeof(u64);
1455                 result += sz;
1456         }
1457
1458         if (type & PERF_SAMPLE_REGS_USER) {
1459                 if (sample->user_regs.abi) {
1460                         result += sizeof(u64);
1461                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1462                         result += sz;
1463                 } else {
1464                         result += sizeof(u64);
1465                 }
1466         }
1467
1468         if (type & PERF_SAMPLE_STACK_USER) {
1469                 sz = sample->user_stack.size;
1470                 result += sizeof(u64);
1471                 if (sz) {
1472                         result += sz;
1473                         result += sizeof(u64);
1474                 }
1475         }
1476
1477         if (type & PERF_SAMPLE_WEIGHT_TYPE)
1478                 result += sizeof(u64);
1479
1480         if (type & PERF_SAMPLE_DATA_SRC)
1481                 result += sizeof(u64);
1482
1483         if (type & PERF_SAMPLE_TRANSACTION)
1484                 result += sizeof(u64);
1485
1486         if (type & PERF_SAMPLE_REGS_INTR) {
1487                 if (sample->intr_regs.abi) {
1488                         result += sizeof(u64);
1489                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1490                         result += sz;
1491                 } else {
1492                         result += sizeof(u64);
1493                 }
1494         }
1495
1496         if (type & PERF_SAMPLE_PHYS_ADDR)
1497                 result += sizeof(u64);
1498
1499         if (type & PERF_SAMPLE_CGROUP)
1500                 result += sizeof(u64);
1501
1502         if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1503                 result += sizeof(u64);
1504
1505         if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1506                 result += sizeof(u64);
1507
1508         if (type & PERF_SAMPLE_AUX) {
1509                 result += sizeof(u64);
1510                 result += sample->aux_sample.size;
1511         }
1512
1513         return result;
1514 }
1515
1516 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1517                                                __u64 *array, u64 type __maybe_unused)
1518 {
1519         *array = data->weight;
1520 }
1521
1522 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1523                                      const struct perf_sample *sample)
1524 {
1525         size_t sz = sample_read_value_size(read_format);
1526         struct sample_read_value *v = sample->read.group.values;
1527
1528         sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1529                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1530                 memcpy(array, v, sz);
1531                 array = (void *)array + sz;
1532         }
1533         return array;
1534 }
1535
1536 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1537                                   const struct perf_sample *sample)
1538 {
1539         __u64 *array;
1540         size_t sz;
1541         /*
1542          * used for cross-endian analysis. See git commit 65014ab3
1543          * for why this goofiness is needed.
1544          */
1545         union u64_swap u;
1546
1547         array = event->sample.array;
1548
1549         if (type & PERF_SAMPLE_IDENTIFIER) {
1550                 *array = sample->id;
1551                 array++;
1552         }
1553
1554         if (type & PERF_SAMPLE_IP) {
1555                 *array = sample->ip;
1556                 array++;
1557         }
1558
1559         if (type & PERF_SAMPLE_TID) {
1560                 u.val32[0] = sample->pid;
1561                 u.val32[1] = sample->tid;
1562                 *array = u.val64;
1563                 array++;
1564         }
1565
1566         if (type & PERF_SAMPLE_TIME) {
1567                 *array = sample->time;
1568                 array++;
1569         }
1570
1571         if (type & PERF_SAMPLE_ADDR) {
1572                 *array = sample->addr;
1573                 array++;
1574         }
1575
1576         if (type & PERF_SAMPLE_ID) {
1577                 *array = sample->id;
1578                 array++;
1579         }
1580
1581         if (type & PERF_SAMPLE_STREAM_ID) {
1582                 *array = sample->stream_id;
1583                 array++;
1584         }
1585
1586         if (type & PERF_SAMPLE_CPU) {
1587                 u.val32[0] = sample->cpu;
1588                 u.val32[1] = 0;
1589                 *array = u.val64;
1590                 array++;
1591         }
1592
1593         if (type & PERF_SAMPLE_PERIOD) {
1594                 *array = sample->period;
1595                 array++;
1596         }
1597
1598         if (type & PERF_SAMPLE_READ) {
1599                 if (read_format & PERF_FORMAT_GROUP)
1600                         *array = sample->read.group.nr;
1601                 else
1602                         *array = sample->read.one.value;
1603                 array++;
1604
1605                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1606                         *array = sample->read.time_enabled;
1607                         array++;
1608                 }
1609
1610                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1611                         *array = sample->read.time_running;
1612                         array++;
1613                 }
1614
1615                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1616                 if (read_format & PERF_FORMAT_GROUP) {
1617                         array = copy_read_group_values(array, read_format,
1618                                                        sample);
1619                 } else {
1620                         *array = sample->read.one.id;
1621                         array++;
1622
1623                         if (read_format & PERF_FORMAT_LOST) {
1624                                 *array = sample->read.one.lost;
1625                                 array++;
1626                         }
1627                 }
1628         }
1629
1630         if (type & PERF_SAMPLE_CALLCHAIN) {
1631                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1632                 memcpy(array, sample->callchain, sz);
1633                 array = (void *)array + sz;
1634         }
1635
1636         if (type & PERF_SAMPLE_RAW) {
1637                 u.val32[0] = sample->raw_size;
1638                 *array = u.val64;
1639                 array = (void *)array + sizeof(u32);
1640
1641                 memcpy(array, sample->raw_data, sample->raw_size);
1642                 array = (void *)array + sample->raw_size;
1643         }
1644
1645         if (type & PERF_SAMPLE_BRANCH_STACK) {
1646                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1647                 /* nr, hw_idx */
1648                 sz += 2 * sizeof(u64);
1649                 memcpy(array, sample->branch_stack, sz);
1650                 array = (void *)array + sz;
1651         }
1652
1653         if (type & PERF_SAMPLE_REGS_USER) {
1654                 if (sample->user_regs.abi) {
1655                         *array++ = sample->user_regs.abi;
1656                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1657                         memcpy(array, sample->user_regs.regs, sz);
1658                         array = (void *)array + sz;
1659                 } else {
1660                         *array++ = 0;
1661                 }
1662         }
1663
1664         if (type & PERF_SAMPLE_STACK_USER) {
1665                 sz = sample->user_stack.size;
1666                 *array++ = sz;
1667                 if (sz) {
1668                         memcpy(array, sample->user_stack.data, sz);
1669                         array = (void *)array + sz;
1670                         *array++ = sz;
1671                 }
1672         }
1673
1674         if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1675                 arch_perf_synthesize_sample_weight(sample, array, type);
1676                 array++;
1677         }
1678
1679         if (type & PERF_SAMPLE_DATA_SRC) {
1680                 *array = sample->data_src;
1681                 array++;
1682         }
1683
1684         if (type & PERF_SAMPLE_TRANSACTION) {
1685                 *array = sample->transaction;
1686                 array++;
1687         }
1688
1689         if (type & PERF_SAMPLE_REGS_INTR) {
1690                 if (sample->intr_regs.abi) {
1691                         *array++ = sample->intr_regs.abi;
1692                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1693                         memcpy(array, sample->intr_regs.regs, sz);
1694                         array = (void *)array + sz;
1695                 } else {
1696                         *array++ = 0;
1697                 }
1698         }
1699
1700         if (type & PERF_SAMPLE_PHYS_ADDR) {
1701                 *array = sample->phys_addr;
1702                 array++;
1703         }
1704
1705         if (type & PERF_SAMPLE_CGROUP) {
1706                 *array = sample->cgroup;
1707                 array++;
1708         }
1709
1710         if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1711                 *array = sample->data_page_size;
1712                 array++;
1713         }
1714
1715         if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1716                 *array = sample->code_page_size;
1717                 array++;
1718         }
1719
1720         if (type & PERF_SAMPLE_AUX) {
1721                 sz = sample->aux_sample.size;
1722                 *array++ = sz;
1723                 memcpy(array, sample->aux_sample.data, sz);
1724                 array = (void *)array + sz;
1725         }
1726
1727         return 0;
1728 }
1729
1730 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1731 {
1732         __u64 *start = array;
1733
1734         /*
1735          * used for cross-endian analysis. See git commit 65014ab3
1736          * for why this goofiness is needed.
1737          */
1738         union u64_swap u;
1739
1740         if (type & PERF_SAMPLE_TID) {
1741                 u.val32[0] = sample->pid;
1742                 u.val32[1] = sample->tid;
1743                 *array = u.val64;
1744                 array++;
1745         }
1746
1747         if (type & PERF_SAMPLE_TIME) {
1748                 *array = sample->time;
1749                 array++;
1750         }
1751
1752         if (type & PERF_SAMPLE_ID) {
1753                 *array = sample->id;
1754                 array++;
1755         }
1756
1757         if (type & PERF_SAMPLE_STREAM_ID) {
1758                 *array = sample->stream_id;
1759                 array++;
1760         }
1761
1762         if (type & PERF_SAMPLE_CPU) {
1763                 u.val32[0] = sample->cpu;
1764                 u.val32[1] = 0;
1765                 *array = u.val64;
1766                 array++;
1767         }
1768
1769         if (type & PERF_SAMPLE_IDENTIFIER) {
1770                 *array = sample->id;
1771                 array++;
1772         }
1773
1774         return (void *)array - (void *)start;
1775 }
1776
1777 int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1778                                       struct evlist *evlist, struct machine *machine, size_t from)
1779 {
1780         union perf_event *ev;
1781         struct evsel *evsel;
1782         size_t nr = 0, i = 0, sz, max_nr, n, pos;
1783         size_t e1_sz = sizeof(struct id_index_entry);
1784         size_t e2_sz = sizeof(struct id_index_entry_2);
1785         size_t etot_sz = e1_sz + e2_sz;
1786         bool e2_needed = false;
1787         int err;
1788
1789         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1790
1791         pos = 0;
1792         evlist__for_each_entry(evlist, evsel) {
1793                 if (pos++ < from)
1794                         continue;
1795                 nr += evsel->core.ids;
1796         }
1797
1798         if (!nr)
1799                 return 0;
1800
1801         pr_debug2("Synthesizing id index\n");
1802
1803         n = nr > max_nr ? max_nr : nr;
1804         sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1805         ev = zalloc(sz);
1806         if (!ev)
1807                 return -ENOMEM;
1808
1809         sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1810
1811         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1812         ev->id_index.nr = n;
1813
1814         pos = 0;
1815         evlist__for_each_entry(evlist, evsel) {
1816                 u32 j;
1817
1818                 if (pos++ < from)
1819                         continue;
1820                 for (j = 0; j < evsel->core.ids; j++, i++) {
1821                         struct id_index_entry *e;
1822                         struct id_index_entry_2 *e2;
1823                         struct perf_sample_id *sid;
1824
1825                         if (i >= n) {
1826                                 ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1827                                 err = process(tool, ev, NULL, machine);
1828                                 if (err)
1829                                         goto out_err;
1830                                 nr -= n;
1831                                 i = 0;
1832                                 e2_needed = false;
1833                         }
1834
1835                         e = &ev->id_index.entries[i];
1836
1837                         e->id = evsel->core.id[j];
1838
1839                         sid = evlist__id2sid(evlist, e->id);
1840                         if (!sid) {
1841                                 free(ev);
1842                                 return -ENOENT;
1843                         }
1844
1845                         e->idx = sid->idx;
1846                         e->cpu = sid->cpu.cpu;
1847                         e->tid = sid->tid;
1848
1849                         if (sid->machine_pid)
1850                                 e2_needed = true;
1851
1852                         e2 = (void *)ev + sz;
1853                         e2[i].machine_pid = sid->machine_pid;
1854                         e2[i].vcpu        = sid->vcpu.cpu;
1855                 }
1856         }
1857
1858         sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1859         ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1860         ev->id_index.nr = nr;
1861
1862         err = process(tool, ev, NULL, machine);
1863 out_err:
1864         free(ev);
1865
1866         return err;
1867 }
1868
1869 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1870                                     struct evlist *evlist, struct machine *machine)
1871 {
1872         return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1873 }
1874
1875 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1876                                   struct target *target, struct perf_thread_map *threads,
1877                                   perf_event__handler_t process, bool needs_mmap,
1878                                   bool data_mmap, unsigned int nr_threads_synthesize)
1879 {
1880         /*
1881          * When perf runs in non-root PID namespace, and the namespace's proc FS
1882          * is not mounted, nsinfo__is_in_root_namespace() returns false.
1883          * In this case, the proc FS is coming for the parent namespace, thus
1884          * perf tool will wrongly gather process info from its parent PID
1885          * namespace.
1886          *
1887          * To avoid the confusion that the perf tool runs in a child PID
1888          * namespace but it synthesizes thread info from its parent PID
1889          * namespace, returns failure with warning.
1890          */
1891         if (!nsinfo__is_in_root_namespace()) {
1892                 pr_err("Perf runs in non-root PID namespace but it tries to ");
1893                 pr_err("gather process info from its parent PID namespace.\n");
1894                 pr_err("Please mount the proc file system properly, e.g. ");
1895                 pr_err("add the option '--mount-proc' for unshare command.\n");
1896                 return -EPERM;
1897         }
1898
1899         if (target__has_task(target))
1900                 return perf_event__synthesize_thread_map(tool, threads, process, machine,
1901                                                          needs_mmap, data_mmap);
1902         else if (target__has_cpu(target))
1903                 return perf_event__synthesize_threads(tool, process, machine,
1904                                                       needs_mmap, data_mmap,
1905                                                       nr_threads_synthesize);
1906         /* command specified */
1907         return 0;
1908 }
1909
1910 int machine__synthesize_threads(struct machine *machine, struct target *target,
1911                                 struct perf_thread_map *threads, bool needs_mmap,
1912                                 bool data_mmap, unsigned int nr_threads_synthesize)
1913 {
1914         return __machine__synthesize_threads(machine, NULL, target, threads,
1915                                              perf_event__process, needs_mmap,
1916                                              data_mmap, nr_threads_synthesize);
1917 }
1918
1919 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1920 {
1921         struct perf_record_event_update *ev;
1922
1923         size += sizeof(*ev);
1924         size  = PERF_ALIGN(size, sizeof(u64));
1925
1926         ev = zalloc(size);
1927         if (ev) {
1928                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1929                 ev->header.size = (u16)size;
1930                 ev->type        = type;
1931                 ev->id          = id;
1932         }
1933         return ev;
1934 }
1935
1936 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1937                                              perf_event__handler_t process)
1938 {
1939         size_t size = strlen(evsel->unit);
1940         struct perf_record_event_update *ev;
1941         int err;
1942
1943         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1944         if (ev == NULL)
1945                 return -ENOMEM;
1946
1947         strlcpy(ev->data, evsel->unit, size + 1);
1948         err = process(tool, (union perf_event *)ev, NULL, NULL);
1949         free(ev);
1950         return err;
1951 }
1952
1953 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1954                                               perf_event__handler_t process)
1955 {
1956         struct perf_record_event_update *ev;
1957         struct perf_record_event_update_scale *ev_data;
1958         int err;
1959
1960         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1961         if (ev == NULL)
1962                 return -ENOMEM;
1963
1964         ev_data = (struct perf_record_event_update_scale *)ev->data;
1965         ev_data->scale = evsel->scale;
1966         err = process(tool, (union perf_event *)ev, NULL, NULL);
1967         free(ev);
1968         return err;
1969 }
1970
1971 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1972                                              perf_event__handler_t process)
1973 {
1974         struct perf_record_event_update *ev;
1975         size_t len = strlen(evsel->name);
1976         int err;
1977
1978         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1979         if (ev == NULL)
1980                 return -ENOMEM;
1981
1982         strlcpy(ev->data, evsel->name, len + 1);
1983         err = process(tool, (union perf_event *)ev, NULL, NULL);
1984         free(ev);
1985         return err;
1986 }
1987
1988 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
1989                                              perf_event__handler_t process)
1990 {
1991         size_t size = sizeof(struct perf_record_event_update);
1992         struct perf_record_event_update *ev;
1993         int max, err;
1994         u16 type;
1995
1996         if (!evsel->core.own_cpus)
1997                 return 0;
1998
1999         ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
2000         if (!ev)
2001                 return -ENOMEM;
2002
2003         ev->header.type = PERF_RECORD_EVENT_UPDATE;
2004         ev->header.size = (u16)size;
2005         ev->type        = PERF_EVENT_UPDATE__CPUS;
2006         ev->id          = evsel->core.id[0];
2007
2008         cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
2009                                  evsel->core.own_cpus, type, max);
2010
2011         err = process(tool, (union perf_event *)ev, NULL, NULL);
2012         free(ev);
2013         return err;
2014 }
2015
2016 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2017                                  perf_event__handler_t process)
2018 {
2019         struct evsel *evsel;
2020         int err = 0;
2021
2022         evlist__for_each_entry(evlist, evsel) {
2023                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2024                                                   evsel->core.id, process);
2025                 if (err) {
2026                         pr_debug("failed to create perf header attribute\n");
2027                         return err;
2028                 }
2029         }
2030
2031         return err;
2032 }
2033
2034 static bool has_unit(struct evsel *evsel)
2035 {
2036         return evsel->unit && *evsel->unit;
2037 }
2038
2039 static bool has_scale(struct evsel *evsel)
2040 {
2041         return evsel->scale != 1;
2042 }
2043
2044 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2045                                       perf_event__handler_t process, bool is_pipe)
2046 {
2047         struct evsel *evsel;
2048         int err;
2049
2050         /*
2051          * Synthesize other events stuff not carried within
2052          * attr event - unit, scale, name
2053          */
2054         evlist__for_each_entry(evsel_list, evsel) {
2055                 if (!evsel->supported)
2056                         continue;
2057
2058                 /*
2059                  * Synthesize unit and scale only if it's defined.
2060                  */
2061                 if (has_unit(evsel)) {
2062                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2063                         if (err < 0) {
2064                                 pr_err("Couldn't synthesize evsel unit.\n");
2065                                 return err;
2066                         }
2067                 }
2068
2069                 if (has_scale(evsel)) {
2070                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2071                         if (err < 0) {
2072                                 pr_err("Couldn't synthesize evsel evsel.\n");
2073                                 return err;
2074                         }
2075                 }
2076
2077                 if (evsel->core.own_cpus) {
2078                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2079                         if (err < 0) {
2080                                 pr_err("Couldn't synthesize evsel cpus.\n");
2081                                 return err;
2082                         }
2083                 }
2084
2085                 /*
2086                  * Name is needed only for pipe output,
2087                  * perf.data carries event names.
2088                  */
2089                 if (is_pipe) {
2090                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
2091                         if (err < 0) {
2092                                 pr_err("Couldn't synthesize evsel name.\n");
2093                                 return err;
2094                         }
2095                 }
2096         }
2097         return 0;
2098 }
2099
2100 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2101                                 u32 ids, u64 *id, perf_event__handler_t process)
2102 {
2103         union perf_event *ev;
2104         size_t size;
2105         int err;
2106
2107         size = sizeof(struct perf_event_attr);
2108         size = PERF_ALIGN(size, sizeof(u64));
2109         size += sizeof(struct perf_event_header);
2110         size += ids * sizeof(u64);
2111
2112         ev = zalloc(size);
2113
2114         if (ev == NULL)
2115                 return -ENOMEM;
2116
2117         ev->attr.attr = *attr;
2118         memcpy(ev->attr.id, id, ids * sizeof(u64));
2119
2120         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2121         ev->attr.header.size = (u16)size;
2122
2123         if (ev->attr.header.size == size)
2124                 err = process(tool, ev, NULL, NULL);
2125         else
2126                 err = -E2BIG;
2127
2128         free(ev);
2129
2130         return err;
2131 }
2132
2133 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2134                                         perf_event__handler_t process)
2135 {
2136         union perf_event ev;
2137         struct tracing_data *tdata;
2138         ssize_t size = 0, aligned_size = 0, padding;
2139         struct feat_fd ff;
2140
2141         /*
2142          * We are going to store the size of the data followed
2143          * by the data contents. Since the fd descriptor is a pipe,
2144          * we cannot seek back to store the size of the data once
2145          * we know it. Instead we:
2146          *
2147          * - write the tracing data to the temp file
2148          * - get/write the data size to pipe
2149          * - write the tracing data from the temp file
2150          *   to the pipe
2151          */
2152         tdata = tracing_data_get(&evlist->core.entries, fd, true);
2153         if (!tdata)
2154                 return -1;
2155
2156         memset(&ev, 0, sizeof(ev));
2157
2158         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2159         size = tdata->size;
2160         aligned_size = PERF_ALIGN(size, sizeof(u64));
2161         padding = aligned_size - size;
2162         ev.tracing_data.header.size = sizeof(ev.tracing_data);
2163         ev.tracing_data.size = aligned_size;
2164
2165         process(tool, &ev, NULL, NULL);
2166
2167         /*
2168          * The put function will copy all the tracing data
2169          * stored in temp file to the pipe.
2170          */
2171         tracing_data_put(tdata);
2172
2173         ff = (struct feat_fd){ .fd = fd };
2174         if (write_padded(&ff, NULL, 0, padding))
2175                 return -1;
2176
2177         return aligned_size;
2178 }
2179
2180 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2181                                     perf_event__handler_t process, struct machine *machine)
2182 {
2183         union perf_event ev;
2184         size_t len;
2185
2186         if (!pos->hit)
2187                 return 0;
2188
2189         memset(&ev, 0, sizeof(ev));
2190
2191         len = pos->long_name_len + 1;
2192         len = PERF_ALIGN(len, NAME_ALIGN);
2193         memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2194         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2195         ev.build_id.header.misc = misc;
2196         ev.build_id.pid = machine->pid;
2197         ev.build_id.header.size = sizeof(ev.build_id) + len;
2198         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2199
2200         return process(tool, &ev, NULL, machine);
2201 }
2202
2203 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2204                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
2205 {
2206         int err;
2207
2208         if (attrs) {
2209                 err = perf_event__synthesize_attrs(tool, evlist, process);
2210                 if (err < 0) {
2211                         pr_err("Couldn't synthesize attrs.\n");
2212                         return err;
2213                 }
2214         }
2215
2216         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2217         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2218         if (err < 0) {
2219                 pr_err("Couldn't synthesize thread map.\n");
2220                 return err;
2221         }
2222
2223         err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2224         if (err < 0) {
2225                 pr_err("Couldn't synthesize thread map.\n");
2226                 return err;
2227         }
2228
2229         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2230         if (err < 0) {
2231                 pr_err("Couldn't synthesize config.\n");
2232                 return err;
2233         }
2234
2235         return 0;
2236 }
2237
2238 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2239
2240 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2241                                     struct evlist *evlist, perf_event__handler_t process)
2242 {
2243         struct perf_header *header = &session->header;
2244         struct perf_record_header_feature *fe;
2245         struct feat_fd ff;
2246         size_t sz, sz_hdr;
2247         int feat, ret;
2248
2249         sz_hdr = sizeof(fe->header);
2250         sz = sizeof(union perf_event);
2251         /* get a nice alignment */
2252         sz = PERF_ALIGN(sz, page_size);
2253
2254         memset(&ff, 0, sizeof(ff));
2255
2256         ff.buf = malloc(sz);
2257         if (!ff.buf)
2258                 return -ENOMEM;
2259
2260         ff.size = sz - sz_hdr;
2261         ff.ph = &session->header;
2262
2263         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2264                 if (!feat_ops[feat].synthesize) {
2265                         pr_debug("No record header feature for header :%d\n", feat);
2266                         continue;
2267                 }
2268
2269                 ff.offset = sizeof(*fe);
2270
2271                 ret = feat_ops[feat].write(&ff, evlist);
2272                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2273                         pr_debug("Error writing feature\n");
2274                         continue;
2275                 }
2276                 /* ff.buf may have changed due to realloc in do_write() */
2277                 fe = ff.buf;
2278                 memset(fe, 0, sizeof(*fe));
2279
2280                 fe->feat_id = feat;
2281                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
2282                 fe->header.size = ff.offset;
2283
2284                 ret = process(tool, ff.buf, NULL, NULL);
2285                 if (ret) {
2286                         free(ff.buf);
2287                         return ret;
2288                 }
2289         }
2290
2291         /* Send HEADER_LAST_FEATURE mark. */
2292         fe = ff.buf;
2293         fe->feat_id     = HEADER_LAST_FEATURE;
2294         fe->header.type = PERF_RECORD_HEADER_FEATURE;
2295         fe->header.size = sizeof(*fe);
2296
2297         ret = process(tool, ff.buf, NULL, NULL);
2298
2299         free(ff.buf);
2300         return ret;
2301 }
2302
2303 int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2304                                     struct perf_session *session,
2305                                     struct perf_data *data,
2306                                     perf_event__handler_t process)
2307 {
2308         int err;
2309         int ret = 0;
2310         struct evlist *evlist = session->evlist;
2311
2312         /*
2313          * We need to synthesize events first, because some
2314          * features works on top of them (on report side).
2315          */
2316         err = perf_event__synthesize_attrs(tool, evlist, process);
2317         if (err < 0) {
2318                 pr_err("Couldn't synthesize attrs.\n");
2319                 return err;
2320         }
2321         ret += err;
2322
2323         err = perf_event__synthesize_features(tool, session, evlist, process);
2324         if (err < 0) {
2325                 pr_err("Couldn't synthesize features.\n");
2326                 return err;
2327         }
2328         ret += err;
2329
2330         if (have_tracepoints(&evlist->core.entries)) {
2331                 int fd = perf_data__fd(data);
2332
2333                 /*
2334                  * FIXME err <= 0 here actually means that
2335                  * there were no tracepoints so its not really
2336                  * an error, just that we don't need to
2337                  * synthesize anything.  We really have to
2338                  * return this more properly and also
2339                  * propagate errors that now are calling die()
2340                  */
2341                 err = perf_event__synthesize_tracing_data(tool, fd, evlist,
2342                                                           process);
2343                 if (err <= 0) {
2344                         pr_err("Couldn't record tracing data.\n");
2345                         return err;
2346                 }
2347                 ret += err;
2348         }
2349
2350         return ret;
2351 }
2352
2353 int parse_synth_opt(char *synth)
2354 {
2355         char *p, *q;
2356         int ret = 0;
2357
2358         if (synth == NULL)
2359                 return -1;
2360
2361         for (q = synth; (p = strsep(&q, ",")); p = q) {
2362                 if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2363                         return 0;
2364
2365                 if (!strcasecmp(p, "all"))
2366                         return PERF_SYNTH_ALL;
2367
2368                 if (!strcasecmp(p, "task"))
2369                         ret |= PERF_SYNTH_TASK;
2370                 else if (!strcasecmp(p, "mmap"))
2371                         ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2372                 else if (!strcasecmp(p, "cgroup"))
2373                         ret |= PERF_SYNTH_CGROUP;
2374                 else
2375                         return -1;
2376         }
2377
2378         return ret;
2379 }