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                                              struct machine *machine,
 368                                              bool is_kernel)
 369 {
 370         struct build_id bid;
 371         struct nsinfo *nsi;
 372         struct nscookie nc;
 373         struct dso *dso = NULL;
 374         struct dso_id id;
 375         int rc;
 376
 377         if (is_kernel) {
 378                 rc = sysfs__read_build_id("/sys/kernel/notes", &bid);
 379                 goto out;
 380         }
 381
 382         id.maj = event->maj;
 383         id.min = event->min;
 384         id.ino = event->ino;
 385         id.ino_generation = event->ino_generation;
 386
 387         dso = dsos__findnew_id(&machine->dsos, event->filename, &id);
 388         if (dso && dso->has_build_id) {
 389                 bid = dso->bid;
 390                 rc = 0;
 391                 goto out;
 392         }
 393
 394         nsi = nsinfo__new(event->pid);
 395         nsinfo__mountns_enter(nsi, &nc);
 396
 397         rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1;
 398
 399         nsinfo__mountns_exit(&nc);
 400         nsinfo__put(nsi);
 401
 402 out:
 403         if (rc == 0) {
 404                 memcpy(event->build_id, bid.data, sizeof(bid.data));
 405                 event->build_id_size = (u8) bid.size;
 406                 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID;
 407                 event->__reserved_1 = 0;
 408                 event->__reserved_2 = 0;
 409
 410                 if (dso && !dso->has_build_id)
 411                         dso__set_build_id(dso, &bid);
 412         } else {
 413                 if (event->filename[0] == '/') {
 414                         pr_debug2("Failed to read build ID for %s\n",
 415                                   event->filename);
 416                 }
 417         }
 418         dso__put(dso);
 419 }
 420
 421 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 422                                        union perf_event *event,
 423                                        pid_t pid, pid_t tgid,
 424                                        perf_event__handler_t process,
 425                                        struct machine *machine,
 426                                        bool mmap_data)
 427 {
 428         unsigned long long t;
 429         char bf[BUFSIZ];
 430         struct io io;
 431         bool truncation = false;
 432         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 433         int rc = 0;
 434         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 435         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 436
 437         if (machine__is_default_guest(machine))
 438                 return 0;
 439
 440         snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps",
 441                 machine->root_dir, pid, pid);
 442
 443         io.fd = open(bf, O_RDONLY, 0);
 444         if (io.fd < 0) {
 445                 /*
 446                  * We raced with a task exiting - just return:
 447                  */
 448                 pr_debug("couldn't open %s\n", bf);
 449                 return -1;
 450         }
 451         io__init(&io, io.fd, bf, sizeof(bf));
 452
 453         event->header.type = PERF_RECORD_MMAP2;
 454         t = rdclock();
 455
 456         while (!io.eof) {
 457                 static const char anonstr[] = "//anon";
 458                 size_t size, aligned_size;
 459
 460                 /* ensure null termination since stack will be reused. */
 461                 event->mmap2.filename[0] = '\0';
 462
 463                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 464                 if (!read_proc_maps_line(&io,
 465                                         &event->mmap2.start,
 466                                         &event->mmap2.len,
 467                                         &event->mmap2.prot,
 468                                         &event->mmap2.flags,
 469                                         &event->mmap2.pgoff,
 470                                         &event->mmap2.maj,
 471                                         &event->mmap2.min,
 472                                         &event->mmap2.ino,
 473                                         sizeof(event->mmap2.filename),
 474                                         event->mmap2.filename))
 475                         continue;
 476
 477                 if ((rdclock() - t) > timeout) {
 478                         pr_warning("Reading %s/proc/%d/task/%d/maps time out. "
 479                                    "You may want to increase "
 480                                    "the time limit by --proc-map-timeout\n",
 481                                    machine->root_dir, pid, pid);
 482                         truncation = true;
 483                         goto out;
 484                 }
 485
 486                 event->mmap2.ino_generation = 0;
 487
 488                 /*
 489                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 490                  */
 491                 if (machine__is_host(machine))
 492                         event->header.misc = PERF_RECORD_MISC_USER;
 493                 else
 494                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 495
 496                 if ((event->mmap2.prot & PROT_EXEC) == 0) {
 497                         if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0)
 498                                 continue;
 499
 500                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 501                 }
 502
 503 out:
 504                 if (truncation)
 505                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 506
 507                 if (!strcmp(event->mmap2.filename, ""))
 508                         strcpy(event->mmap2.filename, anonstr);
 509
 510                 if (hugetlbfs_mnt_len &&
 511                     !strncmp(event->mmap2.filename, hugetlbfs_mnt,
 512                              hugetlbfs_mnt_len)) {
 513                         strcpy(event->mmap2.filename, anonstr);
 514                         event->mmap2.flags |= MAP_HUGETLB;
 515                 }
 516
 517                 size = strlen(event->mmap2.filename) + 1;
 518                 aligned_size = PERF_ALIGN(size, sizeof(u64));
 519                 event->mmap2.len -= event->mmap.start;
 520                 event->mmap2.header.size = (sizeof(event->mmap2) -
 521                                         (sizeof(event->mmap2.filename) - aligned_size));
 522                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size +
 523                         (aligned_size - size));
 524                 event->mmap2.header.size += machine->id_hdr_size;
 525                 event->mmap2.pid = tgid;
 526                 event->mmap2.tid = pid;
 527
 528                 if (symbol_conf.buildid_mmap2)
 529                         perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
 530
 531                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 532                         rc = -1;
 533                         break;
 534                 }
 535
 536                 if (truncation)
 537                         break;
 538         }
 539
 540         close(io.fd);
 541         return rc;
 542 }
 543
 544 #ifdef HAVE_FILE_HANDLE
 545 static int perf_event__synthesize_cgroup(struct perf_tool *tool,
 546                                          union perf_event *event,
 547                                          char *path, size_t mount_len,
 548                                          perf_event__handler_t process,
 549                                          struct machine *machine)
 550 {
 551         size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path);
 552         size_t path_len = strlen(path) - mount_len + 1;
 553         struct {
 554                 struct file_handle fh;
 555                 uint64_t cgroup_id;
 556         } handle;
 557         int mount_id;
 558
 559         while (path_len % sizeof(u64))
 560                 path[mount_len + path_len++] = '\0';
 561
 562         memset(&event->cgroup, 0, event_size);
 563
 564         event->cgroup.header.type = PERF_RECORD_CGROUP;
 565         event->cgroup.header.size = event_size + path_len + machine->id_hdr_size;
 566
 567         handle.fh.handle_bytes = sizeof(handle.cgroup_id);
 568         if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) {
 569                 pr_debug("stat failed: %s\n", path);
 570                 return -1;
 571         }
 572
 573         event->cgroup.id = handle.cgroup_id;
 574         strncpy(event->cgroup.path, path + mount_len, path_len);
 575         memset(event->cgroup.path + path_len, 0, machine->id_hdr_size);
 576
 577         if (perf_tool__process_synth_event(tool, event, machine, process) < 0) {
 578                 pr_debug("process synth event failed\n");
 579                 return -1;
 580         }
 581
 582         return 0;
 583 }
 584
 585 static int perf_event__walk_cgroup_tree(struct perf_tool *tool,
 586                                         union perf_event *event,
 587                                         char *path, size_t mount_len,
 588                                         perf_event__handler_t process,
 589                                         struct machine *machine)
 590 {
 591         size_t pos = strlen(path);
 592         DIR *d;
 593         struct dirent *dent;
 594         int ret = 0;
 595
 596         if (perf_event__synthesize_cgroup(tool, event, path, mount_len,
 597                                           process, machine) < 0)
 598                 return -1;
 599
 600         d = opendir(path);
 601         if (d == NULL) {
 602                 pr_debug("failed to open directory: %s\n", path);
 603                 return -1;
 604         }
 605
 606         while ((dent = readdir(d)) != NULL) {
 607                 if (dent->d_type != DT_DIR)
 608                         continue;
 609                 if (!strcmp(dent->d_name, ".") ||
 610                     !strcmp(dent->d_name, ".."))
 611                         continue;
 612
 613                 /* any sane path should be less than PATH_MAX */
 614                 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX)
 615                         continue;
 616
 617                 if (path[pos - 1] != '/')
 618                         strcat(path, "/");
 619                 strcat(path, dent->d_name);
 620
 621                 ret = perf_event__walk_cgroup_tree(tool, event, path,
 622                                                    mount_len, process, machine);
 623                 if (ret < 0)
 624                         break;
 625
 626                 path[pos] = '\0';
 627         }
 628
 629         closedir(d);
 630         return ret;
 631 }
 632
 633 int perf_event__synthesize_cgroups(struct perf_tool *tool,
 634                                    perf_event__handler_t process,
 635                                    struct machine *machine)
 636 {
 637         union perf_event event;
 638         char cgrp_root[PATH_MAX];
 639         size_t mount_len;  /* length of mount point in the path */
 640
 641         if (!tool || !tool->cgroup_events)
 642                 return 0;
 643
 644         if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) {
 645                 pr_debug("cannot find cgroup mount point\n");
 646                 return -1;
 647         }
 648
 649         mount_len = strlen(cgrp_root);
 650         /* make sure the path starts with a slash (after mount point) */
 651         strcat(cgrp_root, "/");
 652
 653         if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len,
 654                                          process, machine) < 0)
 655                 return -1;
 656
 657         return 0;
 658 }
 659 #else
 660 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused,
 661                                    perf_event__handler_t process __maybe_unused,
 662                                    struct machine *machine __maybe_unused)
 663 {
 664         return -1;
 665 }
 666 #endif
 667
 668 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 669                                    struct machine *machine)
 670 {
 671         int rc = 0;
 672         struct map *pos;
 673         struct maps *maps = machine__kernel_maps(machine);
 674         union perf_event *event;
 675         size_t size = symbol_conf.buildid_mmap2 ?
 676                         sizeof(event->mmap2) : sizeof(event->mmap);
 677
 678         event = zalloc(size + machine->id_hdr_size);
 679         if (event == NULL) {
 680                 pr_debug("Not enough memory synthesizing mmap event "
 681                          "for kernel modules\n");
 682                 return -1;
 683         }
 684
 685         /*
 686          * kernel uses 0 for user space maps, see kernel/perf_event.c
 687          * __perf_event_mmap
 688          */
 689         if (machine__is_host(machine))
 690                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 691         else
 692                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 693
 694         maps__for_each_entry(maps, pos) {
 695                 if (!__map__is_kmodule(pos))
 696                         continue;
 697
 698                 if (symbol_conf.buildid_mmap2) {
 699                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 700                         event->mmap2.header.type = PERF_RECORD_MMAP2;
 701                         event->mmap2.header.size = (sizeof(event->mmap2) -
 702                                                 (sizeof(event->mmap2.filename) - size));
 703                         memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 704                         event->mmap2.header.size += machine->id_hdr_size;
 705                         event->mmap2.start = pos->start;
 706                         event->mmap2.len   = pos->end - pos->start;
 707                         event->mmap2.pid   = machine->pid;
 708
 709                         memcpy(event->mmap2.filename, pos->dso->long_name,
 710                                pos->dso->long_name_len + 1);
 711
 712                         perf_record_mmap2__read_build_id(&event->mmap2, machine, false);
 713                 } else {
 714                         size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 715                         event->mmap.header.type = PERF_RECORD_MMAP;
 716                         event->mmap.header.size = (sizeof(event->mmap) -
 717                                                 (sizeof(event->mmap.filename) - size));
 718                         memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 719                         event->mmap.header.size += machine->id_hdr_size;
 720                         event->mmap.start = pos->start;
 721                         event->mmap.len   = pos->end - pos->start;
 722                         event->mmap.pid   = machine->pid;
 723
 724                         memcpy(event->mmap.filename, pos->dso->long_name,
 725                                pos->dso->long_name_len + 1);
 726                 }
 727
 728                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 729                         rc = -1;
 730                         break;
 731                 }
 732         }
 733
 734         free(event);
 735         return rc;
 736 }
 737
 738 static int filter_task(const struct dirent *dirent)
 739 {
 740         return isdigit(dirent->d_name[0]);
 741 }
 742
 743 static int __event__synthesize_thread(union perf_event *comm_event,
 744                                       union perf_event *mmap_event,
 745                                       union perf_event *fork_event,
 746                                       union perf_event *namespaces_event,
 747                                       pid_t pid, int full, perf_event__handler_t process,
 748                                       struct perf_tool *tool, struct machine *machine,
 749                                       bool needs_mmap, bool mmap_data)
 750 {
 751         char filename[PATH_MAX];
 752         struct dirent **dirent;
 753         pid_t tgid, ppid;
 754         int rc = 0;
 755         int i, n;
 756
 757         /* special case: only send one comm event using passed in pid */
 758         if (!full) {
 759                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 760                                                    process, machine);
 761
 762                 if (tgid == -1)
 763                         return -1;
 764
 765                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 766                                                       tgid, process, machine) < 0)
 767                         return -1;
 768
 769                 /*
 770                  * send mmap only for thread group leader
 771                  * see thread__init_maps()
 772                  */
 773                 if (pid == tgid && needs_mmap &&
 774                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 775                                                        process, machine, mmap_data))
 776                         return -1;
 777
 778                 return 0;
 779         }
 780
 781         if (machine__is_default_guest(machine))
 782                 return 0;
 783
 784         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 785                  machine->root_dir, pid);
 786
 787         n = scandir(filename, &dirent, filter_task, NULL);
 788         if (n < 0)
 789                 return n;
 790
 791         for (i = 0; i < n; i++) {
 792                 char *end;
 793                 pid_t _pid;
 794                 bool kernel_thread = false;
 795
 796                 _pid = strtol(dirent[i]->d_name, &end, 10);
 797                 if (*end)
 798                         continue;
 799
 800                 /* some threads may exit just after scan, ignore it */
 801                 if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 802                                              &tgid, &ppid, &kernel_thread) != 0)
 803                         continue;
 804
 805                 rc = -1;
 806                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 807                                                 ppid, process, machine) < 0)
 808                         break;
 809
 810                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 811                                                       tgid, process, machine) < 0)
 812                         break;
 813
 814                 /*
 815                  * Send the prepared comm event
 816                  */
 817                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 818                         break;
 819
 820                 rc = 0;
 821                 if (_pid == pid && !kernel_thread && needs_mmap) {
 822                         /* process the parent's maps too */
 823                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 824                                                 process, machine, mmap_data);
 825                         if (rc)
 826                                 break;
 827                 }
 828         }
 829
 830         for (i = 0; i < n; i++)
 831                 zfree(&dirent[i]);
 832         free(dirent);
 833
 834         return rc;
 835 }
 836
 837 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 838                                       struct perf_thread_map *threads,
 839                                       perf_event__handler_t process,
 840                                       struct machine *machine,
 841                                       bool needs_mmap, bool mmap_data)
 842 {
 843         union perf_event *comm_event, *mmap_event, *fork_event;
 844         union perf_event *namespaces_event;
 845         int err = -1, thread, j;
 846
 847         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 848         if (comm_event == NULL)
 849                 goto out;
 850
 851         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 852         if (mmap_event == NULL)
 853                 goto out_free_comm;
 854
 855         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 856         if (fork_event == NULL)
 857                 goto out_free_mmap;
 858
 859         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 860                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 861                                   machine->id_hdr_size);
 862         if (namespaces_event == NULL)
 863                 goto out_free_fork;
 864
 865         err = 0;
 866         for (thread = 0; thread < threads->nr; ++thread) {
 867                 if (__event__synthesize_thread(comm_event, mmap_event,
 868                                                fork_event, namespaces_event,
 869                                                perf_thread_map__pid(threads, thread), 0,
 870                                                process, tool, machine,
 871                                                needs_mmap, mmap_data)) {
 872                         err = -1;
 873                         break;
 874                 }
 875
 876                 /*
 877                  * comm.pid is set to thread group id by
 878                  * perf_event__synthesize_comm
 879                  */
 880                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 881                         bool need_leader = true;
 882
 883                         /* is thread group leader in thread_map? */
 884                         for (j = 0; j < threads->nr; ++j) {
 885                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 886                                         need_leader = false;
 887                                         break;
 888                                 }
 889                         }
 890
 891                         /* if not, generate events for it */
 892                         if (need_leader &&
 893                             __event__synthesize_thread(comm_event, mmap_event,
 894                                                        fork_event, namespaces_event,
 895                                                        comm_event->comm.pid, 0,
 896                                                        process, tool, machine,
 897                                                        needs_mmap, mmap_data)) {
 898                                 err = -1;
 899                                 break;
 900                         }
 901                 }
 902         }
 903         free(namespaces_event);
 904 out_free_fork:
 905         free(fork_event);
 906 out_free_mmap:
 907         free(mmap_event);
 908 out_free_comm:
 909         free(comm_event);
 910 out:
 911         return err;
 912 }
 913
 914 static int __perf_event__synthesize_threads(struct perf_tool *tool,
 915                                             perf_event__handler_t process,
 916                                             struct machine *machine,
 917                                             bool needs_mmap,
 918                                             bool mmap_data,
 919                                             struct dirent **dirent,
 920                                             int start,
 921                                             int num)
 922 {
 923         union perf_event *comm_event, *mmap_event, *fork_event;
 924         union perf_event *namespaces_event;
 925         int err = -1;
 926         char *end;
 927         pid_t pid;
 928         int i;
 929
 930         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 931         if (comm_event == NULL)
 932                 goto out;
 933
 934         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 935         if (mmap_event == NULL)
 936                 goto out_free_comm;
 937
 938         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 939         if (fork_event == NULL)
 940                 goto out_free_mmap;
 941
 942         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 943                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 944                                   machine->id_hdr_size);
 945         if (namespaces_event == NULL)
 946                 goto out_free_fork;
 947
 948         for (i = start; i < start + num; i++) {
 949                 if (!isdigit(dirent[i]->d_name[0]))
 950                         continue;
 951
 952                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 953                 /* only interested in proper numerical dirents */
 954                 if (*end)
 955                         continue;
 956                 /*
 957                  * We may race with exiting thread, so don't stop just because
 958                  * one thread couldn't be synthesized.
 959                  */
 960                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 961                                            namespaces_event, pid, 1, process,
 962                                            tool, machine, needs_mmap, mmap_data);
 963         }
 964         err = 0;
 965
 966         free(namespaces_event);
 967 out_free_fork:
 968         free(fork_event);
 969 out_free_mmap:
 970         free(mmap_event);
 971 out_free_comm:
 972         free(comm_event);
 973 out:
 974         return err;
 975 }
 976
 977 struct synthesize_threads_arg {
 978         struct perf_tool *tool;
 979         perf_event__handler_t process;
 980         struct machine *machine;
 981         bool needs_mmap;
 982         bool mmap_data;
 983         struct dirent **dirent;
 984         int num;
 985         int start;
 986 };
 987
 988 static void *synthesize_threads_worker(void *arg)
 989 {
 990         struct synthesize_threads_arg *args = arg;
 991
 992         __perf_event__synthesize_threads(args->tool, args->process,
 993                                          args->machine,
 994                                          args->needs_mmap, args->mmap_data,
 995                                          args->dirent,
 996                                          args->start, args->num);
 997         return NULL;
 998 }
 999
1000 int perf_event__synthesize_threads(struct perf_tool *tool,
1001                                    perf_event__handler_t process,
1002                                    struct machine *machine,
1003                                    bool needs_mmap, bool mmap_data,
1004                                    unsigned int nr_threads_synthesize)
1005 {
1006         struct synthesize_threads_arg *args = NULL;
1007         pthread_t *synthesize_threads = NULL;
1008         char proc_path[PATH_MAX];
1009         struct dirent **dirent;
1010         int num_per_thread;
1011         int m, n, i, j;
1012         int thread_nr;
1013         int base = 0;
1014         int err = -1;
1015
1016
1017         if (machine__is_default_guest(machine))
1018                 return 0;
1019
1020         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1021         n = scandir(proc_path, &dirent, filter_task, NULL);
1022         if (n < 0)
1023                 return err;
1024
1025         if (nr_threads_synthesize == UINT_MAX)
1026                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1027         else
1028                 thread_nr = nr_threads_synthesize;
1029
1030         if (thread_nr <= 1) {
1031                 err = __perf_event__synthesize_threads(tool, process,
1032                                                        machine,
1033                                                        needs_mmap, mmap_data,
1034                                                        dirent, base, n);
1035                 goto free_dirent;
1036         }
1037         if (thread_nr > n)
1038                 thread_nr = n;
1039
1040         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
1041         if (synthesize_threads == NULL)
1042                 goto free_dirent;
1043
1044         args = calloc(sizeof(*args), thread_nr);
1045         if (args == NULL)
1046                 goto free_threads;
1047
1048         num_per_thread = n / thread_nr;
1049         m = n % thread_nr;
1050         for (i = 0; i < thread_nr; i++) {
1051                 args[i].tool = tool;
1052                 args[i].process = process;
1053                 args[i].machine = machine;
1054                 args[i].needs_mmap = needs_mmap;
1055                 args[i].mmap_data = mmap_data;
1056                 args[i].dirent = dirent;
1057         }
1058         for (i = 0; i < m; i++) {
1059                 args[i].num = num_per_thread + 1;
1060                 args[i].start = i * args[i].num;
1061         }
1062         if (i != 0)
1063                 base = args[i-1].start + args[i-1].num;
1064         for (j = i; j < thread_nr; j++) {
1065                 args[j].num = num_per_thread;
1066                 args[j].start = base + (j - i) * args[i].num;
1067         }
1068
1069         for (i = 0; i < thread_nr; i++) {
1070                 if (pthread_create(&synthesize_threads[i], NULL,
1071                                    synthesize_threads_worker, &args[i]))
1072                         goto out_join;
1073         }
1074         err = 0;
1075 out_join:
1076         for (i = 0; i < thread_nr; i++)
1077                 pthread_join(synthesize_threads[i], NULL);
1078         free(args);
1079 free_threads:
1080         free(synthesize_threads);
1081 free_dirent:
1082         for (i = 0; i < n; i++)
1083                 zfree(&dirent[i]);
1084         free(dirent);
1085
1086         return err;
1087 }
1088
1089 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
1090                                               perf_event__handler_t process __maybe_unused,
1091                                               struct machine *machine __maybe_unused)
1092 {
1093         return 0;
1094 }
1095
1096 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1097                                                 perf_event__handler_t process,
1098                                                 struct machine *machine)
1099 {
1100         union perf_event *event;
1101         size_t size = symbol_conf.buildid_mmap2 ?
1102                         sizeof(event->mmap2) : sizeof(event->mmap);
1103         struct map *map = machine__kernel_map(machine);
1104         struct kmap *kmap;
1105         int err;
1106
1107         if (map == NULL)
1108                 return -1;
1109
1110         kmap = map__kmap(map);
1111         if (!kmap->ref_reloc_sym)
1112                 return -1;
1113
1114         /*
1115          * We should get this from /sys/kernel/sections/.text, but till that is
1116          * available use this, and after it is use this as a fallback for older
1117          * kernels.
1118          */
1119         event = zalloc(size + machine->id_hdr_size);
1120         if (event == NULL) {
1121                 pr_debug("Not enough memory synthesizing mmap event "
1122                          "for kernel modules\n");
1123                 return -1;
1124         }
1125
1126         if (machine__is_host(machine)) {
1127                 /*
1128                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
1129                  * see kernel/perf_event.c __perf_event_mmap
1130                  */
1131                 event->header.misc = PERF_RECORD_MISC_KERNEL;
1132         } else {
1133                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1134         }
1135
1136         if (symbol_conf.buildid_mmap2) {
1137                 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1138                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1139                 size = PERF_ALIGN(size, sizeof(u64));
1140                 event->mmap2.header.type = PERF_RECORD_MMAP2;
1141                 event->mmap2.header.size = (sizeof(event->mmap2) -
1142                                 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1143                 event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1144                 event->mmap2.start = map->start;
1145                 event->mmap2.len   = map->end - event->mmap.start;
1146                 event->mmap2.pid   = machine->pid;
1147
1148                 perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1149         } else {
1150                 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1151                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1152                 size = PERF_ALIGN(size, sizeof(u64));
1153                 event->mmap.header.type = PERF_RECORD_MMAP;
1154                 event->mmap.header.size = (sizeof(event->mmap) -
1155                                 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1156                 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1157                 event->mmap.start = map->start;
1158                 event->mmap.len   = map->end - event->mmap.start;
1159                 event->mmap.pid   = machine->pid;
1160         }
1161
1162         err = perf_tool__process_synth_event(tool, event, machine, process);
1163         free(event);
1164
1165         return err;
1166 }
1167
1168 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
1169                                        perf_event__handler_t process,
1170                                        struct machine *machine)
1171 {
1172         int err;
1173
1174         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1175         if (err < 0)
1176                 return err;
1177
1178         return perf_event__synthesize_extra_kmaps(tool, process, machine);
1179 }
1180
1181 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
1182                                       struct perf_thread_map *threads,
1183                                       perf_event__handler_t process,
1184                                       struct machine *machine)
1185 {
1186         union perf_event *event;
1187         int i, err, size;
1188
1189         size  = sizeof(event->thread_map);
1190         size += threads->nr * sizeof(event->thread_map.entries[0]);
1191
1192         event = zalloc(size);
1193         if (!event)
1194                 return -ENOMEM;
1195
1196         event->header.type = PERF_RECORD_THREAD_MAP;
1197         event->header.size = size;
1198         event->thread_map.nr = threads->nr;
1199
1200         for (i = 0; i < threads->nr; i++) {
1201                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1202                 char *comm = perf_thread_map__comm(threads, i);
1203
1204                 if (!comm)
1205                         comm = (char *) "";
1206
1207                 entry->pid = perf_thread_map__pid(threads, i);
1208                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1209         }
1210
1211         err = process(tool, event, NULL, machine);
1212
1213         free(event);
1214         return err;
1215 }
1216
1217 struct synthesize_cpu_map_data {
1218         const struct perf_cpu_map *map;
1219         int nr;
1220         int min_cpu;
1221         int max_cpu;
1222         int has_any_cpu;
1223         int type;
1224         size_t size;
1225         struct perf_record_cpu_map_data *data;
1226 };
1227
1228 static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1229 {
1230         data->data->type = PERF_CPU_MAP__CPUS;
1231         data->data->cpus_data.nr = data->nr;
1232         for (int i = 0; i < data->nr; i++)
1233                 data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
1234 }
1235
1236 static void synthesize_mask(struct synthesize_cpu_map_data *data)
1237 {
1238         int idx;
1239         struct perf_cpu cpu;
1240
1241         /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1242         data->data->type = PERF_CPU_MAP__MASK;
1243         data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1244         data->data->mask32_data.long_size = 4;
1245
1246         perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1247                 int bit_word = cpu.cpu / 32;
1248                 u32 bit_mask = 1U << (cpu.cpu & 31);
1249
1250                 data->data->mask32_data.mask[bit_word] |= bit_mask;
1251         }
1252 }
1253
1254 static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1255 {
1256         data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1257         data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1258         data->data->range_cpu_data.start_cpu = data->min_cpu;
1259         data->data->range_cpu_data.end_cpu = data->max_cpu;
1260 }
1261
1262 static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1263                                  size_t header_size)
1264 {
1265         size_t size_cpus, size_mask;
1266
1267         syn_data->nr = perf_cpu_map__nr(syn_data->map);
1268         syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
1269
1270         syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1271         syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1272         if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1273                 /* A consecutive range of CPUs can be encoded using a range. */
1274                 assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1275                 syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1276                 syn_data->size = header_size + sizeof(u64);
1277                 return zalloc(syn_data->size);
1278         }
1279
1280         size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1281         /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1282         size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1283                 BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1284         if (syn_data->has_any_cpu || size_cpus < size_mask) {
1285                 /* Follow the CPU map encoding. */
1286                 syn_data->type = PERF_CPU_MAP__CPUS;
1287                 syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1288                 return zalloc(syn_data->size);
1289         }
1290         /* Encode using a bitmask. */
1291         syn_data->type = PERF_CPU_MAP__MASK;
1292         syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1293         return zalloc(syn_data->size);
1294 }
1295
1296 static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
1297 {
1298         switch (data->type) {
1299         case PERF_CPU_MAP__CPUS:
1300                 synthesize_cpus(data);
1301                 break;
1302         case PERF_CPU_MAP__MASK:
1303                 synthesize_mask(data);
1304                 break;
1305         case PERF_CPU_MAP__RANGE_CPUS:
1306                 synthesize_range_cpus(data);
1307                 break;
1308         default:
1309                 break;
1310         }
1311 }
1312
1313 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1314 {
1315         struct synthesize_cpu_map_data syn_data = { .map = map };
1316         struct perf_record_cpu_map *event;
1317
1318
1319         event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1320         if (!event)
1321                 return NULL;
1322
1323         syn_data.data = &event->data;
1324         event->header.type = PERF_RECORD_CPU_MAP;
1325         event->header.size = syn_data.size;
1326         cpu_map_data__synthesize(&syn_data);
1327         return event;
1328 }
1329
1330
1331 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1332                                    const struct perf_cpu_map *map,
1333                                    perf_event__handler_t process,
1334                                    struct machine *machine)
1335 {
1336         struct perf_record_cpu_map *event;
1337         int err;
1338
1339         event = cpu_map_event__new(map);
1340         if (!event)
1341                 return -ENOMEM;
1342
1343         err = process(tool, (union perf_event *) event, NULL, machine);
1344
1345         free(event);
1346         return err;
1347 }
1348
1349 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1350                                        struct perf_stat_config *config,
1351                                        perf_event__handler_t process,
1352                                        struct machine *machine)
1353 {
1354         struct perf_record_stat_config *event;
1355         int size, i = 0, err;
1356
1357         size  = sizeof(*event);
1358         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1359
1360         event = zalloc(size);
1361         if (!event)
1362                 return -ENOMEM;
1363
1364         event->header.type = PERF_RECORD_STAT_CONFIG;
1365         event->header.size = size;
1366         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1367
1368 #define ADD(__term, __val)                                      \
1369         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1370         event->data[i].val = __val;                             \
1371         i++;
1372
1373         ADD(AGGR_MODE,  config->aggr_mode)
1374         ADD(INTERVAL,   config->interval)
1375         ADD(SCALE,      config->scale)
1376
1377         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1378                   "stat config terms unbalanced\n");
1379 #undef ADD
1380
1381         err = process(tool, (union perf_event *) event, NULL, machine);
1382
1383         free(event);
1384         return err;
1385 }
1386
1387 int perf_event__synthesize_stat(struct perf_tool *tool,
1388                                 struct perf_cpu cpu, u32 thread, u64 id,
1389                                 struct perf_counts_values *count,
1390                                 perf_event__handler_t process,
1391                                 struct machine *machine)
1392 {
1393         struct perf_record_stat event;
1394
1395         event.header.type = PERF_RECORD_STAT;
1396         event.header.size = sizeof(event);
1397         event.header.misc = 0;
1398
1399         event.id        = id;
1400         event.cpu       = cpu.cpu;
1401         event.thread    = thread;
1402         event.val       = count->val;
1403         event.ena       = count->ena;
1404         event.run       = count->run;
1405
1406         return process(tool, (union perf_event *) &event, NULL, machine);
1407 }
1408
1409 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1410                                       u64 evtime, u64 type,
1411                                       perf_event__handler_t process,
1412                                       struct machine *machine)
1413 {
1414         struct perf_record_stat_round event;
1415
1416         event.header.type = PERF_RECORD_STAT_ROUND;
1417         event.header.size = sizeof(event);
1418         event.header.misc = 0;
1419
1420         event.time = evtime;
1421         event.type = type;
1422
1423         return process(tool, (union perf_event *) &event, NULL, machine);
1424 }
1425
1426 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1427 {
1428         size_t sz, result = sizeof(struct perf_record_sample);
1429
1430         if (type & PERF_SAMPLE_IDENTIFIER)
1431                 result += sizeof(u64);
1432
1433         if (type & PERF_SAMPLE_IP)
1434                 result += sizeof(u64);
1435
1436         if (type & PERF_SAMPLE_TID)
1437                 result += sizeof(u64);
1438
1439         if (type & PERF_SAMPLE_TIME)
1440                 result += sizeof(u64);
1441
1442         if (type & PERF_SAMPLE_ADDR)
1443                 result += sizeof(u64);
1444
1445         if (type & PERF_SAMPLE_ID)
1446                 result += sizeof(u64);
1447
1448         if (type & PERF_SAMPLE_STREAM_ID)
1449                 result += sizeof(u64);
1450
1451         if (type & PERF_SAMPLE_CPU)
1452                 result += sizeof(u64);
1453
1454         if (type & PERF_SAMPLE_PERIOD)
1455                 result += sizeof(u64);
1456
1457         if (type & PERF_SAMPLE_READ) {
1458                 result += sizeof(u64);
1459                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1460                         result += sizeof(u64);
1461                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1462                         result += sizeof(u64);
1463                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1464                 if (read_format & PERF_FORMAT_GROUP) {
1465                         sz = sample_read_value_size(read_format);
1466                         result += sz * sample->read.group.nr;
1467                 } else {
1468                         result += sizeof(u64);
1469                         if (read_format & PERF_FORMAT_LOST)
1470                                 result += sizeof(u64);
1471                 }
1472         }
1473
1474         if (type & PERF_SAMPLE_CALLCHAIN) {
1475                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1476                 result += sz;
1477         }
1478
1479         if (type & PERF_SAMPLE_RAW) {
1480                 result += sizeof(u32);
1481                 result += sample->raw_size;
1482         }
1483
1484         if (type & PERF_SAMPLE_BRANCH_STACK) {
1485                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1486                 /* nr, hw_idx */
1487                 sz += 2 * sizeof(u64);
1488                 result += sz;
1489         }
1490
1491         if (type & PERF_SAMPLE_REGS_USER) {
1492                 if (sample->user_regs.abi) {
1493                         result += sizeof(u64);
1494                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1495                         result += sz;
1496                 } else {
1497                         result += sizeof(u64);
1498                 }
1499         }
1500
1501         if (type & PERF_SAMPLE_STACK_USER) {
1502                 sz = sample->user_stack.size;
1503                 result += sizeof(u64);
1504                 if (sz) {
1505                         result += sz;
1506                         result += sizeof(u64);
1507                 }
1508         }
1509
1510         if (type & PERF_SAMPLE_WEIGHT_TYPE)
1511                 result += sizeof(u64);
1512
1513         if (type & PERF_SAMPLE_DATA_SRC)
1514                 result += sizeof(u64);
1515
1516         if (type & PERF_SAMPLE_TRANSACTION)
1517                 result += sizeof(u64);
1518
1519         if (type & PERF_SAMPLE_REGS_INTR) {
1520                 if (sample->intr_regs.abi) {
1521                         result += sizeof(u64);
1522                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1523                         result += sz;
1524                 } else {
1525                         result += sizeof(u64);
1526                 }
1527         }
1528
1529         if (type & PERF_SAMPLE_PHYS_ADDR)
1530                 result += sizeof(u64);
1531
1532         if (type & PERF_SAMPLE_CGROUP)
1533                 result += sizeof(u64);
1534
1535         if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1536                 result += sizeof(u64);
1537
1538         if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1539                 result += sizeof(u64);
1540
1541         if (type & PERF_SAMPLE_AUX) {
1542                 result += sizeof(u64);
1543                 result += sample->aux_sample.size;
1544         }
1545
1546         return result;
1547 }
1548
1549 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1550                                                __u64 *array, u64 type __maybe_unused)
1551 {
1552         *array = data->weight;
1553 }
1554
1555 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1556                                      const struct perf_sample *sample)
1557 {
1558         size_t sz = sample_read_value_size(read_format);
1559         struct sample_read_value *v = sample->read.group.values;
1560
1561         sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1562                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1563                 memcpy(array, v, sz);
1564                 array = (void *)array + sz;
1565         }
1566         return array;
1567 }
1568
1569 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1570                                   const struct perf_sample *sample)
1571 {
1572         __u64 *array;
1573         size_t sz;
1574         /*
1575          * used for cross-endian analysis. See git commit 65014ab3
1576          * for why this goofiness is needed.
1577          */
1578         union u64_swap u;
1579
1580         array = event->sample.array;
1581
1582         if (type & PERF_SAMPLE_IDENTIFIER) {
1583                 *array = sample->id;
1584                 array++;
1585         }
1586
1587         if (type & PERF_SAMPLE_IP) {
1588                 *array = sample->ip;
1589                 array++;
1590         }
1591
1592         if (type & PERF_SAMPLE_TID) {
1593                 u.val32[0] = sample->pid;
1594                 u.val32[1] = sample->tid;
1595                 *array = u.val64;
1596                 array++;
1597         }
1598
1599         if (type & PERF_SAMPLE_TIME) {
1600                 *array = sample->time;
1601                 array++;
1602         }
1603
1604         if (type & PERF_SAMPLE_ADDR) {
1605                 *array = sample->addr;
1606                 array++;
1607         }
1608
1609         if (type & PERF_SAMPLE_ID) {
1610                 *array = sample->id;
1611                 array++;
1612         }
1613
1614         if (type & PERF_SAMPLE_STREAM_ID) {
1615                 *array = sample->stream_id;
1616                 array++;
1617         }
1618
1619         if (type & PERF_SAMPLE_CPU) {
1620                 u.val32[0] = sample->cpu;
1621                 u.val32[1] = 0;
1622                 *array = u.val64;
1623                 array++;
1624         }
1625
1626         if (type & PERF_SAMPLE_PERIOD) {
1627                 *array = sample->period;
1628                 array++;
1629         }
1630
1631         if (type & PERF_SAMPLE_READ) {
1632                 if (read_format & PERF_FORMAT_GROUP)
1633                         *array = sample->read.group.nr;
1634                 else
1635                         *array = sample->read.one.value;
1636                 array++;
1637
1638                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1639                         *array = sample->read.time_enabled;
1640                         array++;
1641                 }
1642
1643                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1644                         *array = sample->read.time_running;
1645                         array++;
1646                 }
1647
1648                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1649                 if (read_format & PERF_FORMAT_GROUP) {
1650                         array = copy_read_group_values(array, read_format,
1651                                                        sample);
1652                 } else {
1653                         *array = sample->read.one.id;
1654                         array++;
1655
1656                         if (read_format & PERF_FORMAT_LOST) {
1657                                 *array = sample->read.one.lost;
1658                                 array++;
1659                         }
1660                 }
1661         }
1662
1663         if (type & PERF_SAMPLE_CALLCHAIN) {
1664                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1665                 memcpy(array, sample->callchain, sz);
1666                 array = (void *)array + sz;
1667         }
1668
1669         if (type & PERF_SAMPLE_RAW) {
1670                 u.val32[0] = sample->raw_size;
1671                 *array = u.val64;
1672                 array = (void *)array + sizeof(u32);
1673
1674                 memcpy(array, sample->raw_data, sample->raw_size);
1675                 array = (void *)array + sample->raw_size;
1676         }
1677
1678         if (type & PERF_SAMPLE_BRANCH_STACK) {
1679                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1680                 /* nr, hw_idx */
1681                 sz += 2 * sizeof(u64);
1682                 memcpy(array, sample->branch_stack, sz);
1683                 array = (void *)array + sz;
1684         }
1685
1686         if (type & PERF_SAMPLE_REGS_USER) {
1687                 if (sample->user_regs.abi) {
1688                         *array++ = sample->user_regs.abi;
1689                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1690                         memcpy(array, sample->user_regs.regs, sz);
1691                         array = (void *)array + sz;
1692                 } else {
1693                         *array++ = 0;
1694                 }
1695         }
1696
1697         if (type & PERF_SAMPLE_STACK_USER) {
1698                 sz = sample->user_stack.size;
1699                 *array++ = sz;
1700                 if (sz) {
1701                         memcpy(array, sample->user_stack.data, sz);
1702                         array = (void *)array + sz;
1703                         *array++ = sz;
1704                 }
1705         }
1706
1707         if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1708                 arch_perf_synthesize_sample_weight(sample, array, type);
1709                 array++;
1710         }
1711
1712         if (type & PERF_SAMPLE_DATA_SRC) {
1713                 *array = sample->data_src;
1714                 array++;
1715         }
1716
1717         if (type & PERF_SAMPLE_TRANSACTION) {
1718                 *array = sample->transaction;
1719                 array++;
1720         }
1721
1722         if (type & PERF_SAMPLE_REGS_INTR) {
1723                 if (sample->intr_regs.abi) {
1724                         *array++ = sample->intr_regs.abi;
1725                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1726                         memcpy(array, sample->intr_regs.regs, sz);
1727                         array = (void *)array + sz;
1728                 } else {
1729                         *array++ = 0;
1730                 }
1731         }
1732
1733         if (type & PERF_SAMPLE_PHYS_ADDR) {
1734                 *array = sample->phys_addr;
1735                 array++;
1736         }
1737
1738         if (type & PERF_SAMPLE_CGROUP) {
1739                 *array = sample->cgroup;
1740                 array++;
1741         }
1742
1743         if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1744                 *array = sample->data_page_size;
1745                 array++;
1746         }
1747
1748         if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1749                 *array = sample->code_page_size;
1750                 array++;
1751         }
1752
1753         if (type & PERF_SAMPLE_AUX) {
1754                 sz = sample->aux_sample.size;
1755                 *array++ = sz;
1756                 memcpy(array, sample->aux_sample.data, sz);
1757                 array = (void *)array + sz;
1758         }
1759
1760         return 0;
1761 }
1762
1763 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1764 {
1765         __u64 *start = array;
1766
1767         /*
1768          * used for cross-endian analysis. See git commit 65014ab3
1769          * for why this goofiness is needed.
1770          */
1771         union u64_swap u;
1772
1773         if (type & PERF_SAMPLE_TID) {
1774                 u.val32[0] = sample->pid;
1775                 u.val32[1] = sample->tid;
1776                 *array = u.val64;
1777                 array++;
1778         }
1779
1780         if (type & PERF_SAMPLE_TIME) {
1781                 *array = sample->time;
1782                 array++;
1783         }
1784
1785         if (type & PERF_SAMPLE_ID) {
1786                 *array = sample->id;
1787                 array++;
1788         }
1789
1790         if (type & PERF_SAMPLE_STREAM_ID) {
1791                 *array = sample->stream_id;
1792                 array++;
1793         }
1794
1795         if (type & PERF_SAMPLE_CPU) {
1796                 u.val32[0] = sample->cpu;
1797                 u.val32[1] = 0;
1798                 *array = u.val64;
1799                 array++;
1800         }
1801
1802         if (type & PERF_SAMPLE_IDENTIFIER) {
1803                 *array = sample->id;
1804                 array++;
1805         }
1806
1807         return (void *)array - (void *)start;
1808 }
1809
1810 int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1811                                       struct evlist *evlist, struct machine *machine, size_t from)
1812 {
1813         union perf_event *ev;
1814         struct evsel *evsel;
1815         size_t nr = 0, i = 0, sz, max_nr, n, pos;
1816         size_t e1_sz = sizeof(struct id_index_entry);
1817         size_t e2_sz = sizeof(struct id_index_entry_2);
1818         size_t etot_sz = e1_sz + e2_sz;
1819         bool e2_needed = false;
1820         int err;
1821
1822         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1823
1824         pos = 0;
1825         evlist__for_each_entry(evlist, evsel) {
1826                 if (pos++ < from)
1827                         continue;
1828                 nr += evsel->core.ids;
1829         }
1830
1831         if (!nr)
1832                 return 0;
1833
1834         pr_debug2("Synthesizing id index\n");
1835
1836         n = nr > max_nr ? max_nr : nr;
1837         sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1838         ev = zalloc(sz);
1839         if (!ev)
1840                 return -ENOMEM;
1841
1842         sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1843
1844         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1845         ev->id_index.nr = n;
1846
1847         pos = 0;
1848         evlist__for_each_entry(evlist, evsel) {
1849                 u32 j;
1850
1851                 if (pos++ < from)
1852                         continue;
1853                 for (j = 0; j < evsel->core.ids; j++, i++) {
1854                         struct id_index_entry *e;
1855                         struct id_index_entry_2 *e2;
1856                         struct perf_sample_id *sid;
1857
1858                         if (i >= n) {
1859                                 ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1860                                 err = process(tool, ev, NULL, machine);
1861                                 if (err)
1862                                         goto out_err;
1863                                 nr -= n;
1864                                 i = 0;
1865                                 e2_needed = false;
1866                         }
1867
1868                         e = &ev->id_index.entries[i];
1869
1870                         e->id = evsel->core.id[j];
1871
1872                         sid = evlist__id2sid(evlist, e->id);
1873                         if (!sid) {
1874                                 free(ev);
1875                                 return -ENOENT;
1876                         }
1877
1878                         e->idx = sid->idx;
1879                         e->cpu = sid->cpu.cpu;
1880                         e->tid = sid->tid;
1881
1882                         if (sid->machine_pid)
1883                                 e2_needed = true;
1884
1885                         e2 = (void *)ev + sz;
1886                         e2[i].machine_pid = sid->machine_pid;
1887                         e2[i].vcpu        = sid->vcpu.cpu;
1888                 }
1889         }
1890
1891         sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1892         ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1893         ev->id_index.nr = nr;
1894
1895         err = process(tool, ev, NULL, machine);
1896 out_err:
1897         free(ev);
1898
1899         return err;
1900 }
1901
1902 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1903                                     struct evlist *evlist, struct machine *machine)
1904 {
1905         return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1906 }
1907
1908 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1909                                   struct target *target, struct perf_thread_map *threads,
1910                                   perf_event__handler_t process, bool needs_mmap,
1911                                   bool data_mmap, unsigned int nr_threads_synthesize)
1912 {
1913         /*
1914          * When perf runs in non-root PID namespace, and the namespace's proc FS
1915          * is not mounted, nsinfo__is_in_root_namespace() returns false.
1916          * In this case, the proc FS is coming for the parent namespace, thus
1917          * perf tool will wrongly gather process info from its parent PID
1918          * namespace.
1919          *
1920          * To avoid the confusion that the perf tool runs in a child PID
1921          * namespace but it synthesizes thread info from its parent PID
1922          * namespace, returns failure with warning.
1923          */
1924         if (!nsinfo__is_in_root_namespace()) {
1925                 pr_err("Perf runs in non-root PID namespace but it tries to ");
1926                 pr_err("gather process info from its parent PID namespace.\n");
1927                 pr_err("Please mount the proc file system properly, e.g. ");
1928                 pr_err("add the option '--mount-proc' for unshare command.\n");
1929                 return -EPERM;
1930         }
1931
1932         if (target__has_task(target))
1933                 return perf_event__synthesize_thread_map(tool, threads, process, machine,
1934                                                          needs_mmap, data_mmap);
1935         else if (target__has_cpu(target))
1936                 return perf_event__synthesize_threads(tool, process, machine,
1937                                                       needs_mmap, data_mmap,
1938                                                       nr_threads_synthesize);
1939         /* command specified */
1940         return 0;
1941 }
1942
1943 int machine__synthesize_threads(struct machine *machine, struct target *target,
1944                                 struct perf_thread_map *threads, bool needs_mmap,
1945                                 bool data_mmap, unsigned int nr_threads_synthesize)
1946 {
1947         return __machine__synthesize_threads(machine, NULL, target, threads,
1948                                              perf_event__process, needs_mmap,
1949                                              data_mmap, nr_threads_synthesize);
1950 }
1951
1952 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1953 {
1954         struct perf_record_event_update *ev;
1955
1956         size += sizeof(*ev);
1957         size  = PERF_ALIGN(size, sizeof(u64));
1958
1959         ev = zalloc(size);
1960         if (ev) {
1961                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1962                 ev->header.size = (u16)size;
1963                 ev->type        = type;
1964                 ev->id          = id;
1965         }
1966         return ev;
1967 }
1968
1969 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1970                                              perf_event__handler_t process)
1971 {
1972         size_t size = strlen(evsel->unit);
1973         struct perf_record_event_update *ev;
1974         int err;
1975
1976         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1977         if (ev == NULL)
1978                 return -ENOMEM;
1979
1980         strlcpy(ev->unit, evsel->unit, size + 1);
1981         err = process(tool, (union perf_event *)ev, NULL, NULL);
1982         free(ev);
1983         return err;
1984 }
1985
1986 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1987                                               perf_event__handler_t process)
1988 {
1989         struct perf_record_event_update *ev;
1990         struct perf_record_event_update_scale *ev_data;
1991         int err;
1992
1993         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1994         if (ev == NULL)
1995                 return -ENOMEM;
1996
1997         ev->scale.scale = evsel->scale;
1998         err = process(tool, (union perf_event *)ev, NULL, NULL);
1999         free(ev);
2000         return err;
2001 }
2002
2003 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
2004                                              perf_event__handler_t process)
2005 {
2006         struct perf_record_event_update *ev;
2007         size_t len = strlen(evsel->name);
2008         int err;
2009
2010         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2011         if (ev == NULL)
2012                 return -ENOMEM;
2013
2014         strlcpy(ev->name, evsel->name, len + 1);
2015         err = process(tool, (union perf_event *)ev, NULL, NULL);
2016         free(ev);
2017         return err;
2018 }
2019
2020 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
2021                                              perf_event__handler_t process)
2022 {
2023         struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2024         struct perf_record_event_update *ev;
2025         int err;
2026
2027         ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
2028         if (!ev)
2029                 return -ENOMEM;
2030
2031         syn_data.data = &ev->cpus.cpus;
2032         ev->header.type = PERF_RECORD_EVENT_UPDATE;
2033         ev->header.size = (u16)syn_data.size;
2034         ev->type        = PERF_EVENT_UPDATE__CPUS;
2035         ev->id          = evsel->core.id[0];
2036         cpu_map_data__synthesize(&syn_data);
2037
2038         err = process(tool, (union perf_event *)ev, NULL, NULL);
2039         free(ev);
2040         return err;
2041 }
2042
2043 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
2044                                  perf_event__handler_t process)
2045 {
2046         struct evsel *evsel;
2047         int err = 0;
2048
2049         evlist__for_each_entry(evlist, evsel) {
2050                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2051                                                   evsel->core.id, process);
2052                 if (err) {
2053                         pr_debug("failed to create perf header attribute\n");
2054                         return err;
2055                 }
2056         }
2057
2058         return err;
2059 }
2060
2061 static bool has_unit(struct evsel *evsel)
2062 {
2063         return evsel->unit && *evsel->unit;
2064 }
2065
2066 static bool has_scale(struct evsel *evsel)
2067 {
2068         return evsel->scale != 1;
2069 }
2070
2071 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
2072                                       perf_event__handler_t process, bool is_pipe)
2073 {
2074         struct evsel *evsel;
2075         int err;
2076
2077         /*
2078          * Synthesize other events stuff not carried within
2079          * attr event - unit, scale, name
2080          */
2081         evlist__for_each_entry(evsel_list, evsel) {
2082                 if (!evsel->supported)
2083                         continue;
2084
2085                 /*
2086                  * Synthesize unit and scale only if it's defined.
2087                  */
2088                 if (has_unit(evsel)) {
2089                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2090                         if (err < 0) {
2091                                 pr_err("Couldn't synthesize evsel unit.\n");
2092                                 return err;
2093                         }
2094                 }
2095
2096                 if (has_scale(evsel)) {
2097                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2098                         if (err < 0) {
2099                                 pr_err("Couldn't synthesize evsel evsel.\n");
2100                                 return err;
2101                         }
2102                 }
2103
2104                 if (evsel->core.own_cpus) {
2105                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2106                         if (err < 0) {
2107                                 pr_err("Couldn't synthesize evsel cpus.\n");
2108                                 return err;
2109                         }
2110                 }
2111
2112                 /*
2113                  * Name is needed only for pipe output,
2114                  * perf.data carries event names.
2115                  */
2116                 if (is_pipe) {
2117                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
2118                         if (err < 0) {
2119                                 pr_err("Couldn't synthesize evsel name.\n");
2120                                 return err;
2121                         }
2122                 }
2123         }
2124         return 0;
2125 }
2126
2127 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
2128                                 u32 ids, u64 *id, perf_event__handler_t process)
2129 {
2130         union perf_event *ev;
2131         size_t size;
2132         int err;
2133
2134         size = sizeof(struct perf_event_attr);
2135         size = PERF_ALIGN(size, sizeof(u64));
2136         size += sizeof(struct perf_event_header);
2137         size += ids * sizeof(u64);
2138
2139         ev = zalloc(size);
2140
2141         if (ev == NULL)
2142                 return -ENOMEM;
2143
2144         ev->attr.attr = *attr;
2145         memcpy(ev->attr.id, id, ids * sizeof(u64));
2146
2147         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2148         ev->attr.header.size = (u16)size;
2149
2150         if (ev->attr.header.size == size)
2151                 err = process(tool, ev, NULL, NULL);
2152         else
2153                 err = -E2BIG;
2154
2155         free(ev);
2156
2157         return err;
2158 }
2159
2160 #ifdef HAVE_LIBTRACEEVENT
2161 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
2162                                         perf_event__handler_t process)
2163 {
2164         union perf_event ev;
2165         struct tracing_data *tdata;
2166         ssize_t size = 0, aligned_size = 0, padding;
2167         struct feat_fd ff;
2168
2169         /*
2170          * We are going to store the size of the data followed
2171          * by the data contents. Since the fd descriptor is a pipe,
2172          * we cannot seek back to store the size of the data once
2173          * we know it. Instead we:
2174          *
2175          * - write the tracing data to the temp file
2176          * - get/write the data size to pipe
2177          * - write the tracing data from the temp file
2178          *   to the pipe
2179          */
2180         tdata = tracing_data_get(&evlist->core.entries, fd, true);
2181         if (!tdata)
2182                 return -1;
2183
2184         memset(&ev, 0, sizeof(ev));
2185
2186         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2187         size = tdata->size;
2188         aligned_size = PERF_ALIGN(size, sizeof(u64));
2189         padding = aligned_size - size;
2190         ev.tracing_data.header.size = sizeof(ev.tracing_data);
2191         ev.tracing_data.size = aligned_size;
2192
2193         process(tool, &ev, NULL, NULL);
2194
2195         /*
2196          * The put function will copy all the tracing data
2197          * stored in temp file to the pipe.
2198          */
2199         tracing_data_put(tdata);
2200
2201         ff = (struct feat_fd){ .fd = fd };
2202         if (write_padded(&ff, NULL, 0, padding))
2203                 return -1;
2204
2205         return aligned_size;
2206 }
2207 #endif
2208
2209 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
2210                                     perf_event__handler_t process, struct machine *machine)
2211 {
2212         union perf_event ev;
2213         size_t len;
2214
2215         if (!pos->hit)
2216                 return 0;
2217
2218         memset(&ev, 0, sizeof(ev));
2219
2220         len = pos->long_name_len + 1;
2221         len = PERF_ALIGN(len, NAME_ALIGN);
2222         memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data));
2223         ev.build_id.size = pos->bid.size;
2224         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2225         ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2226         ev.build_id.pid = machine->pid;
2227         ev.build_id.header.size = sizeof(ev.build_id) + len;
2228         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
2229
2230         return process(tool, &ev, NULL, machine);
2231 }
2232
2233 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
2234                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
2235 {
2236         int err;
2237
2238         if (attrs) {
2239                 err = perf_event__synthesize_attrs(tool, evlist, process);
2240                 if (err < 0) {
2241                         pr_err("Couldn't synthesize attrs.\n");
2242                         return err;
2243                 }
2244         }
2245
2246         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2247         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2248         if (err < 0) {
2249                 pr_err("Couldn't synthesize thread map.\n");
2250                 return err;
2251         }
2252
2253         err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2254         if (err < 0) {
2255                 pr_err("Couldn't synthesize thread map.\n");
2256                 return err;
2257         }
2258
2259         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2260         if (err < 0) {
2261                 pr_err("Couldn't synthesize config.\n");
2262                 return err;
2263         }
2264
2265         return 0;
2266 }
2267
2268 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2269
2270 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
2271                                     struct evlist *evlist, perf_event__handler_t process)
2272 {
2273         struct perf_header *header = &session->header;
2274         struct perf_record_header_feature *fe;
2275         struct feat_fd ff;
2276         size_t sz, sz_hdr;
2277         int feat, ret;
2278
2279         sz_hdr = sizeof(fe->header);
2280         sz = sizeof(union perf_event);
2281         /* get a nice alignment */
2282         sz = PERF_ALIGN(sz, page_size);
2283
2284         memset(&ff, 0, sizeof(ff));
2285
2286         ff.buf = malloc(sz);
2287         if (!ff.buf)
2288                 return -ENOMEM;
2289
2290         ff.size = sz - sz_hdr;
2291         ff.ph = &session->header;
2292
2293         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2294                 if (!feat_ops[feat].synthesize) {
2295                         pr_debug("No record header feature for header :%d\n", feat);
2296                         continue;
2297                 }
2298
2299                 ff.offset = sizeof(*fe);
2300
2301                 ret = feat_ops[feat].write(&ff, evlist);
2302                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2303                         pr_debug("Error writing feature\n");
2304                         continue;
2305                 }
2306                 /* ff.buf may have changed due to realloc in do_write() */
2307                 fe = ff.buf;
2308                 memset(fe, 0, sizeof(*fe));
2309
2310                 fe->feat_id = feat;
2311                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
2312                 fe->header.size = ff.offset;
2313
2314                 ret = process(tool, ff.buf, NULL, NULL);
2315                 if (ret) {
2316                         free(ff.buf);
2317                         return ret;
2318                 }
2319         }
2320
2321         /* Send HEADER_LAST_FEATURE mark. */
2322         fe = ff.buf;
2323         fe->feat_id     = HEADER_LAST_FEATURE;
2324         fe->header.type = PERF_RECORD_HEADER_FEATURE;
2325         fe->header.size = sizeof(*fe);
2326
2327         ret = process(tool, ff.buf, NULL, NULL);
2328
2329         free(ff.buf);
2330         return ret;
2331 }
2332
2333 int perf_event__synthesize_for_pipe(struct perf_tool *tool,
2334                                     struct perf_session *session,
2335                                     struct perf_data *data,
2336                                     perf_event__handler_t process)
2337 {
2338         int err;
2339         int ret = 0;
2340         struct evlist *evlist = session->evlist;
2341
2342         /*
2343          * We need to synthesize events first, because some
2344          * features works on top of them (on report side).
2345          */
2346         err = perf_event__synthesize_attrs(tool, evlist, process);
2347         if (err < 0) {
2348                 pr_err("Couldn't synthesize attrs.\n");
2349                 return err;
2350         }
2351         ret += err;
2352
2353         err = perf_event__synthesize_features(tool, session, evlist, process);
2354         if (err < 0) {
2355                 pr_err("Couldn't synthesize features.\n");
2356                 return err;
2357         }
2358         ret += err;
2359
2360 #ifdef HAVE_LIBTRACEEVENT
2361         if (have_tracepoints(&evlist->core.entries)) {
2362                 int fd = perf_data__fd(data);
2363
2364                 /*
2365                  * FIXME err <= 0 here actually means that
2366                  * there were no tracepoints so its not really
2367                  * an error, just that we don't need to
2368                  * synthesize anything.  We really have to
2369                  * return this more properly and also
2370                  * propagate errors that now are calling die()
2371                  */
2372                 err = perf_event__synthesize_tracing_data(tool, fd, evlist,
2373                                                           process);
2374                 if (err <= 0) {
2375                         pr_err("Couldn't record tracing data.\n");
2376                         return err;
2377                 }
2378                 ret += err;
2379         }
2380 #else
2381         (void)data;
2382 #endif
2383
2384         return ret;
2385 }
2386
2387 int parse_synth_opt(char *synth)
2388 {
2389         char *p, *q;
2390         int ret = 0;
2391
2392         if (synth == NULL)
2393                 return -1;
2394
2395         for (q = synth; (p = strsep(&q, ",")); p = q) {
2396                 if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2397                         return 0;
2398
2399                 if (!strcasecmp(p, "all"))
2400                         return PERF_SYNTH_ALL;
2401
2402                 if (!strcasecmp(p, "task"))
2403                         ret |= PERF_SYNTH_TASK;
2404                 else if (!strcasecmp(p, "mmap"))
2405                         ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2406                 else if (!strcasecmp(p, "cgroup"))
2407                         ret |= PERF_SYNTH_CGROUP;
2408                 else
2409                         return -1;
2410         }
2411
2412         return ret;
2413 }