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(const 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(const 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(const 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(const 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(dso)) {
 389                 bid = *dso__bid(dso);
 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(dso))
 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(const 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(const 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(const 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(const 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(const 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 struct perf_event__synthesize_modules_maps_cb_args {
 669         const struct perf_tool *tool;
 670         perf_event__handler_t process;
 671         struct machine *machine;
 672         union perf_event *event;
 673 };
 674
 675 static int perf_event__synthesize_modules_maps_cb(struct map *map, void *data)
 676 {
 677         struct perf_event__synthesize_modules_maps_cb_args *args = data;
 678         union perf_event *event = args->event;
 679         struct dso *dso;
 680         size_t size;
 681
 682         if (!__map__is_kmodule(map))
 683                 return 0;
 684
 685         dso = map__dso(map);
 686         if (symbol_conf.buildid_mmap2) {
 687                 size = PERF_ALIGN(dso__long_name_len(dso) + 1, sizeof(u64));
 688                 event->mmap2.header.type = PERF_RECORD_MMAP2;
 689                 event->mmap2.header.size = (sizeof(event->mmap2) -
 690                                         (sizeof(event->mmap2.filename) - size));
 691                 memset(event->mmap2.filename + size, 0, args->machine->id_hdr_size);
 692                 event->mmap2.header.size += args->machine->id_hdr_size;
 693                 event->mmap2.start = map__start(map);
 694                 event->mmap2.len   = map__size(map);
 695                 event->mmap2.pid   = args->machine->pid;
 696
 697                 memcpy(event->mmap2.filename, dso__long_name(dso), dso__long_name_len(dso) + 1);
 698
 699                 perf_record_mmap2__read_build_id(&event->mmap2, args->machine, false);
 700         } else {
 701                 size = PERF_ALIGN(dso__long_name_len(dso) + 1, sizeof(u64));
 702                 event->mmap.header.type = PERF_RECORD_MMAP;
 703                 event->mmap.header.size = (sizeof(event->mmap) -
 704                                         (sizeof(event->mmap.filename) - size));
 705                 memset(event->mmap.filename + size, 0, args->machine->id_hdr_size);
 706                 event->mmap.header.size += args->machine->id_hdr_size;
 707                 event->mmap.start = map__start(map);
 708                 event->mmap.len   = map__size(map);
 709                 event->mmap.pid   = args->machine->pid;
 710
 711                 memcpy(event->mmap.filename, dso__long_name(dso), dso__long_name_len(dso) + 1);
 712         }
 713
 714         if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0)
 715                 return -1;
 716
 717         return 0;
 718 }
 719
 720 int perf_event__synthesize_modules(const struct perf_tool *tool, perf_event__handler_t process,
 721                                    struct machine *machine)
 722 {
 723         int rc;
 724         struct maps *maps = machine__kernel_maps(machine);
 725         struct perf_event__synthesize_modules_maps_cb_args args = {
 726                 .tool = tool,
 727                 .process = process,
 728                 .machine = machine,
 729         };
 730         size_t size = symbol_conf.buildid_mmap2
 731                 ? sizeof(args.event->mmap2)
 732                 : sizeof(args.event->mmap);
 733
 734         args.event = zalloc(size + machine->id_hdr_size);
 735         if (args.event == NULL) {
 736                 pr_debug("Not enough memory synthesizing mmap event "
 737                          "for kernel modules\n");
 738                 return -1;
 739         }
 740
 741         /*
 742          * kernel uses 0 for user space maps, see kernel/perf_event.c
 743          * __perf_event_mmap
 744          */
 745         if (machine__is_host(machine))
 746                 args.event->header.misc = PERF_RECORD_MISC_KERNEL;
 747         else
 748                 args.event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 749
 750         rc = maps__for_each_map(maps, perf_event__synthesize_modules_maps_cb, &args);
 751
 752         free(args.event);
 753         return rc;
 754 }
 755
 756 static int filter_task(const struct dirent *dirent)
 757 {
 758         return isdigit(dirent->d_name[0]);
 759 }
 760
 761 static int __event__synthesize_thread(union perf_event *comm_event,
 762                                       union perf_event *mmap_event,
 763                                       union perf_event *fork_event,
 764                                       union perf_event *namespaces_event,
 765                                       pid_t pid, int full, perf_event__handler_t process,
 766                                       const struct perf_tool *tool, struct machine *machine,
 767                                       bool needs_mmap, bool mmap_data)
 768 {
 769         char filename[PATH_MAX];
 770         struct dirent **dirent;
 771         pid_t tgid, ppid;
 772         int rc = 0;
 773         int i, n;
 774
 775         /* special case: only send one comm event using passed in pid */
 776         if (!full) {
 777                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 778                                                    process, machine);
 779
 780                 if (tgid == -1)
 781                         return -1;
 782
 783                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 784                                                       tgid, process, machine) < 0)
 785                         return -1;
 786
 787                 /*
 788                  * send mmap only for thread group leader
 789                  * see thread__init_maps()
 790                  */
 791                 if (pid == tgid && needs_mmap &&
 792                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 793                                                        process, machine, mmap_data))
 794                         return -1;
 795
 796                 return 0;
 797         }
 798
 799         if (machine__is_default_guest(machine))
 800                 return 0;
 801
 802         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 803                  machine->root_dir, pid);
 804
 805         n = scandir(filename, &dirent, filter_task, NULL);
 806         if (n < 0)
 807                 return n;
 808
 809         for (i = 0; i < n; i++) {
 810                 char *end;
 811                 pid_t _pid;
 812                 bool kernel_thread = false;
 813
 814                 _pid = strtol(dirent[i]->d_name, &end, 10);
 815                 if (*end)
 816                         continue;
 817
 818                 /* some threads may exit just after scan, ignore it */
 819                 if (perf_event__prepare_comm(comm_event, pid, _pid, machine,
 820                                              &tgid, &ppid, &kernel_thread) != 0)
 821                         continue;
 822
 823                 rc = -1;
 824                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 825                                                 ppid, process, machine) < 0)
 826                         break;
 827
 828                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 829                                                       tgid, process, machine) < 0)
 830                         break;
 831
 832                 /*
 833                  * Send the prepared comm event
 834                  */
 835                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 836                         break;
 837
 838                 rc = 0;
 839                 if (_pid == pid && !kernel_thread && needs_mmap) {
 840                         /* process the parent's maps too */
 841                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 842                                                 process, machine, mmap_data);
 843                         if (rc)
 844                                 break;
 845                 }
 846         }
 847
 848         for (i = 0; i < n; i++)
 849                 zfree(&dirent[i]);
 850         free(dirent);
 851
 852         return rc;
 853 }
 854
 855 int perf_event__synthesize_thread_map(const struct perf_tool *tool,
 856                                       struct perf_thread_map *threads,
 857                                       perf_event__handler_t process,
 858                                       struct machine *machine,
 859                                       bool needs_mmap, bool mmap_data)
 860 {
 861         union perf_event *comm_event, *mmap_event, *fork_event;
 862         union perf_event *namespaces_event;
 863         int err = -1, thread, j;
 864
 865         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 866         if (comm_event == NULL)
 867                 goto out;
 868
 869         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 870         if (mmap_event == NULL)
 871                 goto out_free_comm;
 872
 873         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 874         if (fork_event == NULL)
 875                 goto out_free_mmap;
 876
 877         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 878                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 879                                   machine->id_hdr_size);
 880         if (namespaces_event == NULL)
 881                 goto out_free_fork;
 882
 883         err = 0;
 884         for (thread = 0; thread < threads->nr; ++thread) {
 885                 if (__event__synthesize_thread(comm_event, mmap_event,
 886                                                fork_event, namespaces_event,
 887                                                perf_thread_map__pid(threads, thread), 0,
 888                                                process, tool, machine,
 889                                                needs_mmap, mmap_data)) {
 890                         err = -1;
 891                         break;
 892                 }
 893
 894                 /*
 895                  * comm.pid is set to thread group id by
 896                  * perf_event__synthesize_comm
 897                  */
 898                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 899                         bool need_leader = true;
 900
 901                         /* is thread group leader in thread_map? */
 902                         for (j = 0; j < threads->nr; ++j) {
 903                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 904                                         need_leader = false;
 905                                         break;
 906                                 }
 907                         }
 908
 909                         /* if not, generate events for it */
 910                         if (need_leader &&
 911                             __event__synthesize_thread(comm_event, mmap_event,
 912                                                        fork_event, namespaces_event,
 913                                                        comm_event->comm.pid, 0,
 914                                                        process, tool, machine,
 915                                                        needs_mmap, mmap_data)) {
 916                                 err = -1;
 917                                 break;
 918                         }
 919                 }
 920         }
 921         free(namespaces_event);
 922 out_free_fork:
 923         free(fork_event);
 924 out_free_mmap:
 925         free(mmap_event);
 926 out_free_comm:
 927         free(comm_event);
 928 out:
 929         return err;
 930 }
 931
 932 static int __perf_event__synthesize_threads(const struct perf_tool *tool,
 933                                             perf_event__handler_t process,
 934                                             struct machine *machine,
 935                                             bool needs_mmap,
 936                                             bool mmap_data,
 937                                             struct dirent **dirent,
 938                                             int start,
 939                                             int num)
 940 {
 941         union perf_event *comm_event, *mmap_event, *fork_event;
 942         union perf_event *namespaces_event;
 943         int err = -1;
 944         char *end;
 945         pid_t pid;
 946         int i;
 947
 948         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 949         if (comm_event == NULL)
 950                 goto out;
 951
 952         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 953         if (mmap_event == NULL)
 954                 goto out_free_comm;
 955
 956         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 957         if (fork_event == NULL)
 958                 goto out_free_mmap;
 959
 960         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 961                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 962                                   machine->id_hdr_size);
 963         if (namespaces_event == NULL)
 964                 goto out_free_fork;
 965
 966         for (i = start; i < start + num; i++) {
 967                 if (!isdigit(dirent[i]->d_name[0]))
 968                         continue;
 969
 970                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 971                 /* only interested in proper numerical dirents */
 972                 if (*end)
 973                         continue;
 974                 /*
 975                  * We may race with exiting thread, so don't stop just because
 976                  * one thread couldn't be synthesized.
 977                  */
 978                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 979                                            namespaces_event, pid, 1, process,
 980                                            tool, machine, needs_mmap, mmap_data);
 981         }
 982         err = 0;
 983
 984         free(namespaces_event);
 985 out_free_fork:
 986         free(fork_event);
 987 out_free_mmap:
 988         free(mmap_event);
 989 out_free_comm:
 990         free(comm_event);
 991 out:
 992         return err;
 993 }
 994
 995 struct synthesize_threads_arg {
 996         const struct perf_tool *tool;
 997         perf_event__handler_t process;
 998         struct machine *machine;
 999         bool needs_mmap;
1000         bool mmap_data;
1001         struct dirent **dirent;
1002         int num;
1003         int start;
1004 };
1005
1006 static void *synthesize_threads_worker(void *arg)
1007 {
1008         struct synthesize_threads_arg *args = arg;
1009
1010         __perf_event__synthesize_threads(args->tool, args->process,
1011                                          args->machine,
1012                                          args->needs_mmap, args->mmap_data,
1013                                          args->dirent,
1014                                          args->start, args->num);
1015         return NULL;
1016 }
1017
1018 int perf_event__synthesize_threads(const struct perf_tool *tool,
1019                                    perf_event__handler_t process,
1020                                    struct machine *machine,
1021                                    bool needs_mmap, bool mmap_data,
1022                                    unsigned int nr_threads_synthesize)
1023 {
1024         struct synthesize_threads_arg *args = NULL;
1025         pthread_t *synthesize_threads = NULL;
1026         char proc_path[PATH_MAX];
1027         struct dirent **dirent;
1028         int num_per_thread;
1029         int m, n, i, j;
1030         int thread_nr;
1031         int base = 0;
1032         int err = -1;
1033
1034
1035         if (machine__is_default_guest(machine))
1036                 return 0;
1037
1038         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
1039         n = scandir(proc_path, &dirent, filter_task, NULL);
1040         if (n < 0)
1041                 return err;
1042
1043         if (nr_threads_synthesize == UINT_MAX)
1044                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
1045         else
1046                 thread_nr = nr_threads_synthesize;
1047
1048         if (thread_nr <= 1) {
1049                 err = __perf_event__synthesize_threads(tool, process,
1050                                                        machine,
1051                                                        needs_mmap, mmap_data,
1052                                                        dirent, base, n);
1053                 goto free_dirent;
1054         }
1055         if (thread_nr > n)
1056                 thread_nr = n;
1057
1058         synthesize_threads = calloc(thread_nr, sizeof(pthread_t));
1059         if (synthesize_threads == NULL)
1060                 goto free_dirent;
1061
1062         args = calloc(thread_nr, sizeof(*args));
1063         if (args == NULL)
1064                 goto free_threads;
1065
1066         num_per_thread = n / thread_nr;
1067         m = n % thread_nr;
1068         for (i = 0; i < thread_nr; i++) {
1069                 args[i].tool = tool;
1070                 args[i].process = process;
1071                 args[i].machine = machine;
1072                 args[i].needs_mmap = needs_mmap;
1073                 args[i].mmap_data = mmap_data;
1074                 args[i].dirent = dirent;
1075         }
1076         for (i = 0; i < m; i++) {
1077                 args[i].num = num_per_thread + 1;
1078                 args[i].start = i * args[i].num;
1079         }
1080         if (i != 0)
1081                 base = args[i-1].start + args[i-1].num;
1082         for (j = i; j < thread_nr; j++) {
1083                 args[j].num = num_per_thread;
1084                 args[j].start = base + (j - i) * args[i].num;
1085         }
1086
1087         for (i = 0; i < thread_nr; i++) {
1088                 if (pthread_create(&synthesize_threads[i], NULL,
1089                                    synthesize_threads_worker, &args[i]))
1090                         goto out_join;
1091         }
1092         err = 0;
1093 out_join:
1094         for (i = 0; i < thread_nr; i++)
1095                 pthread_join(synthesize_threads[i], NULL);
1096         free(args);
1097 free_threads:
1098         free(synthesize_threads);
1099 free_dirent:
1100         for (i = 0; i < n; i++)
1101                 zfree(&dirent[i]);
1102         free(dirent);
1103
1104         return err;
1105 }
1106
1107 int __weak perf_event__synthesize_extra_kmaps(const struct perf_tool *tool __maybe_unused,
1108                                               perf_event__handler_t process __maybe_unused,
1109                                               struct machine *machine __maybe_unused)
1110 {
1111         return 0;
1112 }
1113
1114 static int __perf_event__synthesize_kernel_mmap(const struct perf_tool *tool,
1115                                                 perf_event__handler_t process,
1116                                                 struct machine *machine)
1117 {
1118         union perf_event *event;
1119         size_t size = symbol_conf.buildid_mmap2 ?
1120                         sizeof(event->mmap2) : sizeof(event->mmap);
1121         struct map *map = machine__kernel_map(machine);
1122         struct kmap *kmap;
1123         int err;
1124
1125         if (map == NULL)
1126                 return -1;
1127
1128         kmap = map__kmap(map);
1129         if (!kmap->ref_reloc_sym)
1130                 return -1;
1131
1132         /*
1133          * We should get this from /sys/kernel/sections/.text, but till that is
1134          * available use this, and after it is use this as a fallback for older
1135          * kernels.
1136          */
1137         event = zalloc(size + machine->id_hdr_size);
1138         if (event == NULL) {
1139                 pr_debug("Not enough memory synthesizing mmap event "
1140                          "for kernel modules\n");
1141                 return -1;
1142         }
1143
1144         if (machine__is_host(machine)) {
1145                 /*
1146                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
1147                  * see kernel/perf_event.c __perf_event_mmap
1148                  */
1149                 event->header.misc = PERF_RECORD_MISC_KERNEL;
1150         } else {
1151                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
1152         }
1153
1154         if (symbol_conf.buildid_mmap2) {
1155                 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename),
1156                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1157                 size = PERF_ALIGN(size, sizeof(u64));
1158                 event->mmap2.header.type = PERF_RECORD_MMAP2;
1159                 event->mmap2.header.size = (sizeof(event->mmap2) -
1160                                 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size);
1161                 event->mmap2.pgoff = kmap->ref_reloc_sym->addr;
1162                 event->mmap2.start = map__start(map);
1163                 event->mmap2.len   = map__end(map) - event->mmap.start;
1164                 event->mmap2.pid   = machine->pid;
1165
1166                 perf_record_mmap2__read_build_id(&event->mmap2, machine, true);
1167         } else {
1168                 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
1169                                 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
1170                 size = PERF_ALIGN(size, sizeof(u64));
1171                 event->mmap.header.type = PERF_RECORD_MMAP;
1172                 event->mmap.header.size = (sizeof(event->mmap) -
1173                                 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
1174                 event->mmap.pgoff = kmap->ref_reloc_sym->addr;
1175                 event->mmap.start = map__start(map);
1176                 event->mmap.len   = map__end(map) - event->mmap.start;
1177                 event->mmap.pid   = machine->pid;
1178         }
1179
1180         err = perf_tool__process_synth_event(tool, event, machine, process);
1181         free(event);
1182
1183         return err;
1184 }
1185
1186 int perf_event__synthesize_kernel_mmap(const struct perf_tool *tool,
1187                                        perf_event__handler_t process,
1188                                        struct machine *machine)
1189 {
1190         int err;
1191
1192         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
1193         if (err < 0)
1194                 return err;
1195
1196         return perf_event__synthesize_extra_kmaps(tool, process, machine);
1197 }
1198
1199 int perf_event__synthesize_thread_map2(const struct perf_tool *tool,
1200                                       struct perf_thread_map *threads,
1201                                       perf_event__handler_t process,
1202                                       struct machine *machine)
1203 {
1204         union perf_event *event;
1205         int i, err, size;
1206
1207         size  = sizeof(event->thread_map);
1208         size += threads->nr * sizeof(event->thread_map.entries[0]);
1209
1210         event = zalloc(size);
1211         if (!event)
1212                 return -ENOMEM;
1213
1214         event->header.type = PERF_RECORD_THREAD_MAP;
1215         event->header.size = size;
1216         event->thread_map.nr = threads->nr;
1217
1218         for (i = 0; i < threads->nr; i++) {
1219                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
1220                 char *comm = perf_thread_map__comm(threads, i);
1221
1222                 if (!comm)
1223                         comm = (char *) "";
1224
1225                 entry->pid = perf_thread_map__pid(threads, i);
1226                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
1227         }
1228
1229         err = process(tool, event, NULL, machine);
1230
1231         free(event);
1232         return err;
1233 }
1234
1235 struct synthesize_cpu_map_data {
1236         const struct perf_cpu_map *map;
1237         int nr;
1238         int min_cpu;
1239         int max_cpu;
1240         int has_any_cpu;
1241         int type;
1242         size_t size;
1243         struct perf_record_cpu_map_data *data;
1244 };
1245
1246 static void synthesize_cpus(struct synthesize_cpu_map_data *data)
1247 {
1248         data->data->type = PERF_CPU_MAP__CPUS;
1249         data->data->cpus_data.nr = data->nr;
1250         for (int i = 0; i < data->nr; i++)
1251                 data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu;
1252 }
1253
1254 static void synthesize_mask(struct synthesize_cpu_map_data *data)
1255 {
1256         int idx;
1257         struct perf_cpu cpu;
1258
1259         /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1260         data->data->type = PERF_CPU_MAP__MASK;
1261         data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu);
1262         data->data->mask32_data.long_size = 4;
1263
1264         perf_cpu_map__for_each_cpu(cpu, idx, data->map) {
1265                 int bit_word = cpu.cpu / 32;
1266                 u32 bit_mask = 1U << (cpu.cpu & 31);
1267
1268                 data->data->mask32_data.mask[bit_word] |= bit_mask;
1269         }
1270 }
1271
1272 static void synthesize_range_cpus(struct synthesize_cpu_map_data *data)
1273 {
1274         data->data->type = PERF_CPU_MAP__RANGE_CPUS;
1275         data->data->range_cpu_data.any_cpu = data->has_any_cpu;
1276         data->data->range_cpu_data.start_cpu = data->min_cpu;
1277         data->data->range_cpu_data.end_cpu = data->max_cpu;
1278 }
1279
1280 static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data,
1281                                  size_t header_size)
1282 {
1283         size_t size_cpus, size_mask;
1284
1285         syn_data->nr = perf_cpu_map__nr(syn_data->map);
1286         syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0;
1287
1288         syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu;
1289         syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu;
1290         if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) {
1291                 /* A consecutive range of CPUs can be encoded using a range. */
1292                 assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64));
1293                 syn_data->type = PERF_CPU_MAP__RANGE_CPUS;
1294                 syn_data->size = header_size + sizeof(u64);
1295                 return zalloc(syn_data->size);
1296         }
1297
1298         size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16);
1299         /* Due to padding, the 4bytes per entry mask variant is always smaller. */
1300         size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) +
1301                 BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32);
1302         if (syn_data->has_any_cpu || size_cpus < size_mask) {
1303                 /* Follow the CPU map encoding. */
1304                 syn_data->type = PERF_CPU_MAP__CPUS;
1305                 syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64));
1306                 return zalloc(syn_data->size);
1307         }
1308         /* Encode using a bitmask. */
1309         syn_data->type = PERF_CPU_MAP__MASK;
1310         syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64));
1311         return zalloc(syn_data->size);
1312 }
1313
1314 static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data)
1315 {
1316         switch (data->type) {
1317         case PERF_CPU_MAP__CPUS:
1318                 synthesize_cpus(data);
1319                 break;
1320         case PERF_CPU_MAP__MASK:
1321                 synthesize_mask(data);
1322                 break;
1323         case PERF_CPU_MAP__RANGE_CPUS:
1324                 synthesize_range_cpus(data);
1325                 break;
1326         default:
1327                 break;
1328         }
1329 }
1330
1331 static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map)
1332 {
1333         struct synthesize_cpu_map_data syn_data = { .map = map };
1334         struct perf_record_cpu_map *event;
1335
1336
1337         event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header));
1338         if (!event)
1339                 return NULL;
1340
1341         syn_data.data = &event->data;
1342         event->header.type = PERF_RECORD_CPU_MAP;
1343         event->header.size = syn_data.size;
1344         cpu_map_data__synthesize(&syn_data);
1345         return event;
1346 }
1347
1348
1349 int perf_event__synthesize_cpu_map(const struct perf_tool *tool,
1350                                    const struct perf_cpu_map *map,
1351                                    perf_event__handler_t process,
1352                                    struct machine *machine)
1353 {
1354         struct perf_record_cpu_map *event;
1355         int err;
1356
1357         event = cpu_map_event__new(map);
1358         if (!event)
1359                 return -ENOMEM;
1360
1361         err = process(tool, (union perf_event *) event, NULL, machine);
1362
1363         free(event);
1364         return err;
1365 }
1366
1367 int perf_event__synthesize_stat_config(const struct perf_tool *tool,
1368                                        struct perf_stat_config *config,
1369                                        perf_event__handler_t process,
1370                                        struct machine *machine)
1371 {
1372         struct perf_record_stat_config *event;
1373         int size, i = 0, err;
1374
1375         size  = sizeof(*event);
1376         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1377
1378         event = zalloc(size);
1379         if (!event)
1380                 return -ENOMEM;
1381
1382         event->header.type = PERF_RECORD_STAT_CONFIG;
1383         event->header.size = size;
1384         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1385
1386 #define ADD(__term, __val)                                      \
1387         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1388         event->data[i].val = __val;                             \
1389         i++;
1390
1391         ADD(AGGR_MODE,  config->aggr_mode)
1392         ADD(INTERVAL,   config->interval)
1393         ADD(SCALE,      config->scale)
1394         ADD(AGGR_LEVEL, config->aggr_level)
1395
1396         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1397                   "stat config terms unbalanced\n");
1398 #undef ADD
1399
1400         err = process(tool, (union perf_event *) event, NULL, machine);
1401
1402         free(event);
1403         return err;
1404 }
1405
1406 int perf_event__synthesize_stat(const struct perf_tool *tool,
1407                                 struct perf_cpu cpu, u32 thread, u64 id,
1408                                 struct perf_counts_values *count,
1409                                 perf_event__handler_t process,
1410                                 struct machine *machine)
1411 {
1412         struct perf_record_stat event;
1413
1414         event.header.type = PERF_RECORD_STAT;
1415         event.header.size = sizeof(event);
1416         event.header.misc = 0;
1417
1418         event.id        = id;
1419         event.cpu       = cpu.cpu;
1420         event.thread    = thread;
1421         event.val       = count->val;
1422         event.ena       = count->ena;
1423         event.run       = count->run;
1424
1425         return process(tool, (union perf_event *) &event, NULL, machine);
1426 }
1427
1428 int perf_event__synthesize_stat_round(const struct perf_tool *tool,
1429                                       u64 evtime, u64 type,
1430                                       perf_event__handler_t process,
1431                                       struct machine *machine)
1432 {
1433         struct perf_record_stat_round event;
1434
1435         event.header.type = PERF_RECORD_STAT_ROUND;
1436         event.header.size = sizeof(event);
1437         event.header.misc = 0;
1438
1439         event.time = evtime;
1440         event.type = type;
1441
1442         return process(tool, (union perf_event *) &event, NULL, machine);
1443 }
1444
1445 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1446 {
1447         size_t sz, result = sizeof(struct perf_record_sample);
1448
1449         if (type & PERF_SAMPLE_IDENTIFIER)
1450                 result += sizeof(u64);
1451
1452         if (type & PERF_SAMPLE_IP)
1453                 result += sizeof(u64);
1454
1455         if (type & PERF_SAMPLE_TID)
1456                 result += sizeof(u64);
1457
1458         if (type & PERF_SAMPLE_TIME)
1459                 result += sizeof(u64);
1460
1461         if (type & PERF_SAMPLE_ADDR)
1462                 result += sizeof(u64);
1463
1464         if (type & PERF_SAMPLE_ID)
1465                 result += sizeof(u64);
1466
1467         if (type & PERF_SAMPLE_STREAM_ID)
1468                 result += sizeof(u64);
1469
1470         if (type & PERF_SAMPLE_CPU)
1471                 result += sizeof(u64);
1472
1473         if (type & PERF_SAMPLE_PERIOD)
1474                 result += sizeof(u64);
1475
1476         if (type & PERF_SAMPLE_READ) {
1477                 result += sizeof(u64);
1478                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1479                         result += sizeof(u64);
1480                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1481                         result += sizeof(u64);
1482                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1483                 if (read_format & PERF_FORMAT_GROUP) {
1484                         sz = sample_read_value_size(read_format);
1485                         result += sz * sample->read.group.nr;
1486                 } else {
1487                         result += sizeof(u64);
1488                         if (read_format & PERF_FORMAT_LOST)
1489                                 result += sizeof(u64);
1490                 }
1491         }
1492
1493         if (type & PERF_SAMPLE_CALLCHAIN) {
1494                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1495                 result += sz;
1496         }
1497
1498         if (type & PERF_SAMPLE_RAW) {
1499                 result += sizeof(u32);
1500                 result += sample->raw_size;
1501         }
1502
1503         if (type & PERF_SAMPLE_BRANCH_STACK) {
1504                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1505                 /* nr, hw_idx */
1506                 sz += 2 * sizeof(u64);
1507                 result += sz;
1508         }
1509
1510         if (type & PERF_SAMPLE_REGS_USER) {
1511                 if (sample->user_regs.abi) {
1512                         result += sizeof(u64);
1513                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1514                         result += sz;
1515                 } else {
1516                         result += sizeof(u64);
1517                 }
1518         }
1519
1520         if (type & PERF_SAMPLE_STACK_USER) {
1521                 sz = sample->user_stack.size;
1522                 result += sizeof(u64);
1523                 if (sz) {
1524                         result += sz;
1525                         result += sizeof(u64);
1526                 }
1527         }
1528
1529         if (type & PERF_SAMPLE_WEIGHT_TYPE)
1530                 result += sizeof(u64);
1531
1532         if (type & PERF_SAMPLE_DATA_SRC)
1533                 result += sizeof(u64);
1534
1535         if (type & PERF_SAMPLE_TRANSACTION)
1536                 result += sizeof(u64);
1537
1538         if (type & PERF_SAMPLE_REGS_INTR) {
1539                 if (sample->intr_regs.abi) {
1540                         result += sizeof(u64);
1541                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1542                         result += sz;
1543                 } else {
1544                         result += sizeof(u64);
1545                 }
1546         }
1547
1548         if (type & PERF_SAMPLE_PHYS_ADDR)
1549                 result += sizeof(u64);
1550
1551         if (type & PERF_SAMPLE_CGROUP)
1552                 result += sizeof(u64);
1553
1554         if (type & PERF_SAMPLE_DATA_PAGE_SIZE)
1555                 result += sizeof(u64);
1556
1557         if (type & PERF_SAMPLE_CODE_PAGE_SIZE)
1558                 result += sizeof(u64);
1559
1560         if (type & PERF_SAMPLE_AUX) {
1561                 result += sizeof(u64);
1562                 result += sample->aux_sample.size;
1563         }
1564
1565         return result;
1566 }
1567
1568 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data,
1569                                                __u64 *array, u64 type __maybe_unused)
1570 {
1571         *array = data->weight;
1572 }
1573
1574 static __u64 *copy_read_group_values(__u64 *array, __u64 read_format,
1575                                      const struct perf_sample *sample)
1576 {
1577         size_t sz = sample_read_value_size(read_format);
1578         struct sample_read_value *v = sample->read.group.values;
1579
1580         sample_read_group__for_each(v, sample->read.group.nr, read_format) {
1581                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1582                 memcpy(array, v, sz);
1583                 array = (void *)array + sz;
1584         }
1585         return array;
1586 }
1587
1588 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1589                                   const struct perf_sample *sample)
1590 {
1591         __u64 *array;
1592         size_t sz;
1593         /*
1594          * used for cross-endian analysis. See git commit 65014ab3
1595          * for why this goofiness is needed.
1596          */
1597         union u64_swap u;
1598
1599         array = event->sample.array;
1600
1601         if (type & PERF_SAMPLE_IDENTIFIER) {
1602                 *array = sample->id;
1603                 array++;
1604         }
1605
1606         if (type & PERF_SAMPLE_IP) {
1607                 *array = sample->ip;
1608                 array++;
1609         }
1610
1611         if (type & PERF_SAMPLE_TID) {
1612                 u.val32[0] = sample->pid;
1613                 u.val32[1] = sample->tid;
1614                 *array = u.val64;
1615                 array++;
1616         }
1617
1618         if (type & PERF_SAMPLE_TIME) {
1619                 *array = sample->time;
1620                 array++;
1621         }
1622
1623         if (type & PERF_SAMPLE_ADDR) {
1624                 *array = sample->addr;
1625                 array++;
1626         }
1627
1628         if (type & PERF_SAMPLE_ID) {
1629                 *array = sample->id;
1630                 array++;
1631         }
1632
1633         if (type & PERF_SAMPLE_STREAM_ID) {
1634                 *array = sample->stream_id;
1635                 array++;
1636         }
1637
1638         if (type & PERF_SAMPLE_CPU) {
1639                 u.val32[0] = sample->cpu;
1640                 u.val32[1] = 0;
1641                 *array = u.val64;
1642                 array++;
1643         }
1644
1645         if (type & PERF_SAMPLE_PERIOD) {
1646                 *array = sample->period;
1647                 array++;
1648         }
1649
1650         if (type & PERF_SAMPLE_READ) {
1651                 if (read_format & PERF_FORMAT_GROUP)
1652                         *array = sample->read.group.nr;
1653                 else
1654                         *array = sample->read.one.value;
1655                 array++;
1656
1657                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1658                         *array = sample->read.time_enabled;
1659                         array++;
1660                 }
1661
1662                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1663                         *array = sample->read.time_running;
1664                         array++;
1665                 }
1666
1667                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1668                 if (read_format & PERF_FORMAT_GROUP) {
1669                         array = copy_read_group_values(array, read_format,
1670                                                        sample);
1671                 } else {
1672                         *array = sample->read.one.id;
1673                         array++;
1674
1675                         if (read_format & PERF_FORMAT_LOST) {
1676                                 *array = sample->read.one.lost;
1677                                 array++;
1678                         }
1679                 }
1680         }
1681
1682         if (type & PERF_SAMPLE_CALLCHAIN) {
1683                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1684                 memcpy(array, sample->callchain, sz);
1685                 array = (void *)array + sz;
1686         }
1687
1688         if (type & PERF_SAMPLE_RAW) {
1689                 u32 *array32 = (void *)array;
1690
1691                 *array32 = sample->raw_size;
1692                 array32++;
1693
1694                 memcpy(array32, sample->raw_data, sample->raw_size);
1695                 array = (void *)(array32 + (sample->raw_size / sizeof(u32)));
1696
1697                 /* make sure the array is 64-bit aligned */
1698                 BUG_ON(((long)array) % sizeof(u64));
1699         }
1700
1701         if (type & PERF_SAMPLE_BRANCH_STACK) {
1702                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1703                 /* nr, hw_idx */
1704                 sz += 2 * sizeof(u64);
1705                 memcpy(array, sample->branch_stack, sz);
1706                 array = (void *)array + sz;
1707         }
1708
1709         if (type & PERF_SAMPLE_REGS_USER) {
1710                 if (sample->user_regs.abi) {
1711                         *array++ = sample->user_regs.abi;
1712                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1713                         memcpy(array, sample->user_regs.regs, sz);
1714                         array = (void *)array + sz;
1715                 } else {
1716                         *array++ = 0;
1717                 }
1718         }
1719
1720         if (type & PERF_SAMPLE_STACK_USER) {
1721                 sz = sample->user_stack.size;
1722                 *array++ = sz;
1723                 if (sz) {
1724                         memcpy(array, sample->user_stack.data, sz);
1725                         array = (void *)array + sz;
1726                         *array++ = sz;
1727                 }
1728         }
1729
1730         if (type & PERF_SAMPLE_WEIGHT_TYPE) {
1731                 arch_perf_synthesize_sample_weight(sample, array, type);
1732                 array++;
1733         }
1734
1735         if (type & PERF_SAMPLE_DATA_SRC) {
1736                 *array = sample->data_src;
1737                 array++;
1738         }
1739
1740         if (type & PERF_SAMPLE_TRANSACTION) {
1741                 *array = sample->transaction;
1742                 array++;
1743         }
1744
1745         if (type & PERF_SAMPLE_REGS_INTR) {
1746                 if (sample->intr_regs.abi) {
1747                         *array++ = sample->intr_regs.abi;
1748                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1749                         memcpy(array, sample->intr_regs.regs, sz);
1750                         array = (void *)array + sz;
1751                 } else {
1752                         *array++ = 0;
1753                 }
1754         }
1755
1756         if (type & PERF_SAMPLE_PHYS_ADDR) {
1757                 *array = sample->phys_addr;
1758                 array++;
1759         }
1760
1761         if (type & PERF_SAMPLE_CGROUP) {
1762                 *array = sample->cgroup;
1763                 array++;
1764         }
1765
1766         if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
1767                 *array = sample->data_page_size;
1768                 array++;
1769         }
1770
1771         if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
1772                 *array = sample->code_page_size;
1773                 array++;
1774         }
1775
1776         if (type & PERF_SAMPLE_AUX) {
1777                 sz = sample->aux_sample.size;
1778                 *array++ = sz;
1779                 memcpy(array, sample->aux_sample.data, sz);
1780                 array = (void *)array + sz;
1781         }
1782
1783         return 0;
1784 }
1785
1786 int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample)
1787 {
1788         __u64 *start = array;
1789
1790         /*
1791          * used for cross-endian analysis. See git commit 65014ab3
1792          * for why this goofiness is needed.
1793          */
1794         union u64_swap u;
1795
1796         if (type & PERF_SAMPLE_TID) {
1797                 u.val32[0] = sample->pid;
1798                 u.val32[1] = sample->tid;
1799                 *array = u.val64;
1800                 array++;
1801         }
1802
1803         if (type & PERF_SAMPLE_TIME) {
1804                 *array = sample->time;
1805                 array++;
1806         }
1807
1808         if (type & PERF_SAMPLE_ID) {
1809                 *array = sample->id;
1810                 array++;
1811         }
1812
1813         if (type & PERF_SAMPLE_STREAM_ID) {
1814                 *array = sample->stream_id;
1815                 array++;
1816         }
1817
1818         if (type & PERF_SAMPLE_CPU) {
1819                 u.val32[0] = sample->cpu;
1820                 u.val32[1] = 0;
1821                 *array = u.val64;
1822                 array++;
1823         }
1824
1825         if (type & PERF_SAMPLE_IDENTIFIER) {
1826                 *array = sample->id;
1827                 array++;
1828         }
1829
1830         return (void *)array - (void *)start;
1831 }
1832
1833 int __perf_event__synthesize_id_index(const struct perf_tool *tool, perf_event__handler_t process,
1834                                       struct evlist *evlist, struct machine *machine, size_t from)
1835 {
1836         union perf_event *ev;
1837         struct evsel *evsel;
1838         size_t nr = 0, i = 0, sz, max_nr, n, pos;
1839         size_t e1_sz = sizeof(struct id_index_entry);
1840         size_t e2_sz = sizeof(struct id_index_entry_2);
1841         size_t etot_sz = e1_sz + e2_sz;
1842         bool e2_needed = false;
1843         int err;
1844
1845         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz;
1846
1847         pos = 0;
1848         evlist__for_each_entry(evlist, evsel) {
1849                 if (pos++ < from)
1850                         continue;
1851                 nr += evsel->core.ids;
1852         }
1853
1854         if (!nr)
1855                 return 0;
1856
1857         pr_debug2("Synthesizing id index\n");
1858
1859         n = nr > max_nr ? max_nr : nr;
1860         sz = sizeof(struct perf_record_id_index) + n * etot_sz;
1861         ev = zalloc(sz);
1862         if (!ev)
1863                 return -ENOMEM;
1864
1865         sz = sizeof(struct perf_record_id_index) + n * e1_sz;
1866
1867         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1868         ev->id_index.nr = n;
1869
1870         pos = 0;
1871         evlist__for_each_entry(evlist, evsel) {
1872                 u32 j;
1873
1874                 if (pos++ < from)
1875                         continue;
1876                 for (j = 0; j < evsel->core.ids; j++, i++) {
1877                         struct id_index_entry *e;
1878                         struct id_index_entry_2 *e2;
1879                         struct perf_sample_id *sid;
1880
1881                         if (i >= n) {
1882                                 ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0);
1883                                 err = process(tool, ev, NULL, machine);
1884                                 if (err)
1885                                         goto out_err;
1886                                 nr -= n;
1887                                 i = 0;
1888                                 e2_needed = false;
1889                         }
1890
1891                         e = &ev->id_index.entries[i];
1892
1893                         e->id = evsel->core.id[j];
1894
1895                         sid = evlist__id2sid(evlist, e->id);
1896                         if (!sid) {
1897                                 free(ev);
1898                                 return -ENOENT;
1899                         }
1900
1901                         e->idx = sid->idx;
1902                         e->cpu = sid->cpu.cpu;
1903                         e->tid = sid->tid;
1904
1905                         if (sid->machine_pid)
1906                                 e2_needed = true;
1907
1908                         e2 = (void *)ev + sz;
1909                         e2[i].machine_pid = sid->machine_pid;
1910                         e2[i].vcpu        = sid->vcpu.cpu;
1911                 }
1912         }
1913
1914         sz = sizeof(struct perf_record_id_index) + nr * e1_sz;
1915         ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0);
1916         ev->id_index.nr = nr;
1917
1918         err = process(tool, ev, NULL, machine);
1919 out_err:
1920         free(ev);
1921
1922         return err;
1923 }
1924
1925 int perf_event__synthesize_id_index(const struct perf_tool *tool, perf_event__handler_t process,
1926                                     struct evlist *evlist, struct machine *machine)
1927 {
1928         return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0);
1929 }
1930
1931 int __machine__synthesize_threads(struct machine *machine, const struct perf_tool *tool,
1932                                   struct target *target, struct perf_thread_map *threads,
1933                                   perf_event__handler_t process, bool needs_mmap,
1934                                   bool data_mmap, unsigned int nr_threads_synthesize)
1935 {
1936         /*
1937          * When perf runs in non-root PID namespace, and the namespace's proc FS
1938          * is not mounted, nsinfo__is_in_root_namespace() returns false.
1939          * In this case, the proc FS is coming for the parent namespace, thus
1940          * perf tool will wrongly gather process info from its parent PID
1941          * namespace.
1942          *
1943          * To avoid the confusion that the perf tool runs in a child PID
1944          * namespace but it synthesizes thread info from its parent PID
1945          * namespace, returns failure with warning.
1946          */
1947         if (!nsinfo__is_in_root_namespace()) {
1948                 pr_err("Perf runs in non-root PID namespace but it tries to ");
1949                 pr_err("gather process info from its parent PID namespace.\n");
1950                 pr_err("Please mount the proc file system properly, e.g. ");
1951                 pr_err("add the option '--mount-proc' for unshare command.\n");
1952                 return -EPERM;
1953         }
1954
1955         if (target__has_task(target))
1956                 return perf_event__synthesize_thread_map(tool, threads, process, machine,
1957                                                          needs_mmap, data_mmap);
1958         else if (target__has_cpu(target))
1959                 return perf_event__synthesize_threads(tool, process, machine,
1960                                                       needs_mmap, data_mmap,
1961                                                       nr_threads_synthesize);
1962         /* command specified */
1963         return 0;
1964 }
1965
1966 int machine__synthesize_threads(struct machine *machine, struct target *target,
1967                                 struct perf_thread_map *threads, bool needs_mmap,
1968                                 bool data_mmap, unsigned int nr_threads_synthesize)
1969 {
1970         return __machine__synthesize_threads(machine, NULL, target, threads,
1971                                              perf_event__process, needs_mmap,
1972                                              data_mmap, nr_threads_synthesize);
1973 }
1974
1975 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1976 {
1977         struct perf_record_event_update *ev;
1978
1979         size += sizeof(*ev);
1980         size  = PERF_ALIGN(size, sizeof(u64));
1981
1982         ev = zalloc(size);
1983         if (ev) {
1984                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1985                 ev->header.size = (u16)size;
1986                 ev->type        = type;
1987                 ev->id          = id;
1988         }
1989         return ev;
1990 }
1991
1992 int perf_event__synthesize_event_update_unit(const struct perf_tool *tool, struct evsel *evsel,
1993                                              perf_event__handler_t process)
1994 {
1995         size_t size = strlen(evsel->unit);
1996         struct perf_record_event_update *ev;
1997         int err;
1998
1999         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
2000         if (ev == NULL)
2001                 return -ENOMEM;
2002
2003         strlcpy(ev->unit, evsel->unit, size + 1);
2004         err = process(tool, (union perf_event *)ev, NULL, NULL);
2005         free(ev);
2006         return err;
2007 }
2008
2009 int perf_event__synthesize_event_update_scale(const struct perf_tool *tool, struct evsel *evsel,
2010                                               perf_event__handler_t process)
2011 {
2012         struct perf_record_event_update *ev;
2013         struct perf_record_event_update_scale *ev_data;
2014         int err;
2015
2016         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
2017         if (ev == NULL)
2018                 return -ENOMEM;
2019
2020         ev->scale.scale = evsel->scale;
2021         err = process(tool, (union perf_event *)ev, NULL, NULL);
2022         free(ev);
2023         return err;
2024 }
2025
2026 int perf_event__synthesize_event_update_name(const struct perf_tool *tool, struct evsel *evsel,
2027                                              perf_event__handler_t process)
2028 {
2029         struct perf_record_event_update *ev;
2030         size_t len = strlen(evsel__name(evsel));
2031         int err;
2032
2033         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
2034         if (ev == NULL)
2035                 return -ENOMEM;
2036
2037         strlcpy(ev->name, evsel->name, len + 1);
2038         err = process(tool, (union perf_event *)ev, NULL, NULL);
2039         free(ev);
2040         return err;
2041 }
2042
2043 int perf_event__synthesize_event_update_cpus(const struct perf_tool *tool, struct evsel *evsel,
2044                                              perf_event__handler_t process)
2045 {
2046         struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus };
2047         struct perf_record_event_update *ev;
2048         int err;
2049
2050         ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64));
2051         if (!ev)
2052                 return -ENOMEM;
2053
2054         syn_data.data = &ev->cpus.cpus;
2055         ev->header.type = PERF_RECORD_EVENT_UPDATE;
2056         ev->header.size = (u16)syn_data.size;
2057         ev->type        = PERF_EVENT_UPDATE__CPUS;
2058         ev->id          = evsel->core.id[0];
2059         cpu_map_data__synthesize(&syn_data);
2060
2061         err = process(tool, (union perf_event *)ev, NULL, NULL);
2062         free(ev);
2063         return err;
2064 }
2065
2066 int perf_event__synthesize_attrs(const struct perf_tool *tool, struct evlist *evlist,
2067                                  perf_event__handler_t process)
2068 {
2069         struct evsel *evsel;
2070         int err = 0;
2071
2072         evlist__for_each_entry(evlist, evsel) {
2073                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
2074                                                   evsel->core.id, process);
2075                 if (err) {
2076                         pr_debug("failed to create perf header attribute\n");
2077                         return err;
2078                 }
2079         }
2080
2081         return err;
2082 }
2083
2084 static bool has_unit(struct evsel *evsel)
2085 {
2086         return evsel->unit && *evsel->unit;
2087 }
2088
2089 static bool has_scale(struct evsel *evsel)
2090 {
2091         return evsel->scale != 1;
2092 }
2093
2094 int perf_event__synthesize_extra_attr(const struct perf_tool *tool, struct evlist *evsel_list,
2095                                       perf_event__handler_t process, bool is_pipe)
2096 {
2097         struct evsel *evsel;
2098         int err;
2099
2100         /*
2101          * Synthesize other events stuff not carried within
2102          * attr event - unit, scale, name
2103          */
2104         evlist__for_each_entry(evsel_list, evsel) {
2105                 if (!evsel->supported)
2106                         continue;
2107
2108                 /*
2109                  * Synthesize unit and scale only if it's defined.
2110                  */
2111                 if (has_unit(evsel)) {
2112                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
2113                         if (err < 0) {
2114                                 pr_err("Couldn't synthesize evsel unit.\n");
2115                                 return err;
2116                         }
2117                 }
2118
2119                 if (has_scale(evsel)) {
2120                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
2121                         if (err < 0) {
2122                                 pr_err("Couldn't synthesize evsel evsel.\n");
2123                                 return err;
2124                         }
2125                 }
2126
2127                 if (evsel->core.own_cpus) {
2128                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
2129                         if (err < 0) {
2130                                 pr_err("Couldn't synthesize evsel cpus.\n");
2131                                 return err;
2132                         }
2133                 }
2134
2135                 /*
2136                  * Name is needed only for pipe output,
2137                  * perf.data carries event names.
2138                  */
2139                 if (is_pipe) {
2140                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
2141                         if (err < 0) {
2142                                 pr_err("Couldn't synthesize evsel name.\n");
2143                                 return err;
2144                         }
2145                 }
2146         }
2147         return 0;
2148 }
2149
2150 int perf_event__synthesize_attr(const struct perf_tool *tool, struct perf_event_attr *attr,
2151                                 u32 ids, u64 *id, perf_event__handler_t process)
2152 {
2153         union perf_event *ev;
2154         size_t size;
2155         int err;
2156
2157         size = sizeof(struct perf_event_attr);
2158         size = PERF_ALIGN(size, sizeof(u64));
2159         size += sizeof(struct perf_event_header);
2160         size += ids * sizeof(u64);
2161
2162         ev = zalloc(size);
2163
2164         if (ev == NULL)
2165                 return -ENOMEM;
2166
2167         ev->attr.attr = *attr;
2168         memcpy(perf_record_header_attr_id(ev), id, ids * sizeof(u64));
2169
2170         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
2171         ev->attr.header.size = (u16)size;
2172
2173         if (ev->attr.header.size == size)
2174                 err = process(tool, ev, NULL, NULL);
2175         else
2176                 err = -E2BIG;
2177
2178         free(ev);
2179
2180         return err;
2181 }
2182
2183 #ifdef HAVE_LIBTRACEEVENT
2184 int perf_event__synthesize_tracing_data(const struct perf_tool *tool, int fd, struct evlist *evlist,
2185                                         perf_event__handler_t process)
2186 {
2187         union perf_event ev;
2188         struct tracing_data *tdata;
2189         ssize_t size = 0, aligned_size = 0, padding;
2190         struct feat_fd ff;
2191
2192         /*
2193          * We are going to store the size of the data followed
2194          * by the data contents. Since the fd descriptor is a pipe,
2195          * we cannot seek back to store the size of the data once
2196          * we know it. Instead we:
2197          *
2198          * - write the tracing data to the temp file
2199          * - get/write the data size to pipe
2200          * - write the tracing data from the temp file
2201          *   to the pipe
2202          */
2203         tdata = tracing_data_get(&evlist->core.entries, fd, true);
2204         if (!tdata)
2205                 return -1;
2206
2207         memset(&ev, 0, sizeof(ev.tracing_data));
2208
2209         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
2210         size = tdata->size;
2211         aligned_size = PERF_ALIGN(size, sizeof(u64));
2212         padding = aligned_size - size;
2213         ev.tracing_data.header.size = sizeof(ev.tracing_data);
2214         ev.tracing_data.size = aligned_size;
2215
2216         process(tool, &ev, NULL, NULL);
2217
2218         /*
2219          * The put function will copy all the tracing data
2220          * stored in temp file to the pipe.
2221          */
2222         tracing_data_put(tdata);
2223
2224         ff = (struct feat_fd){ .fd = fd };
2225         if (write_padded(&ff, NULL, 0, padding))
2226                 return -1;
2227
2228         return aligned_size;
2229 }
2230 #endif
2231
2232 int perf_event__synthesize_build_id(const struct perf_tool *tool,
2233                                     struct perf_sample *sample,
2234                                     struct machine *machine,
2235                                     perf_event__handler_t process,
2236                                     const struct evsel *evsel,
2237                                     __u16 misc,
2238                                     const struct build_id *bid,
2239                                     const char *filename)
2240 {
2241         union perf_event ev;
2242         size_t len;
2243
2244         len = sizeof(ev.build_id) + strlen(filename) + 1;
2245         len = PERF_ALIGN(len, sizeof(u64));
2246
2247         memset(&ev, 0, len);
2248
2249         ev.build_id.size = min(bid->size, sizeof(ev.build_id.build_id));
2250         memcpy(ev.build_id.build_id, bid->data, ev.build_id.size);
2251         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
2252         ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE;
2253         ev.build_id.pid = machine->pid;
2254         ev.build_id.header.size = len;
2255         strcpy(ev.build_id.filename, filename);
2256
2257         if (evsel) {
2258                 void *array = &ev;
2259                 int ret;
2260
2261                 array += ev.header.size;
2262                 ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
2263                 if (ret < 0)
2264                         return ret;
2265
2266                 if (ret & 7) {
2267                         pr_err("Bad id sample size %d\n", ret);
2268                         return -EINVAL;
2269                 }
2270
2271                 ev.header.size += ret;
2272         }
2273
2274         return process(tool, &ev, sample, machine);
2275 }
2276
2277 int perf_event__synthesize_mmap2_build_id(const struct perf_tool *tool,
2278                                           struct perf_sample *sample,
2279                                           struct machine *machine,
2280                                           perf_event__handler_t process,
2281                                           const struct evsel *evsel,
2282                                           __u16 misc,
2283                                           __u32 pid, __u32 tid,
2284                                           __u64 start, __u64 len, __u64 pgoff,
2285                                           const struct build_id *bid,
2286                                           __u32 prot, __u32 flags,
2287                                           const char *filename)
2288 {
2289         union perf_event ev;
2290         size_t ev_len;
2291         void *array;
2292         int ret;
2293
2294         ev_len = sizeof(ev.mmap2) - sizeof(ev.mmap2.filename) + strlen(filename) + 1;
2295         ev_len = PERF_ALIGN(ev_len, sizeof(u64));
2296
2297         memset(&ev, 0, ev_len);
2298
2299         ev.mmap2.header.type = PERF_RECORD_MMAP2;
2300         ev.mmap2.header.misc = misc | PERF_RECORD_MISC_MMAP_BUILD_ID;
2301         ev.mmap2.header.size = ev_len;
2302
2303         ev.mmap2.pid = pid;
2304         ev.mmap2.tid = tid;
2305         ev.mmap2.start = start;
2306         ev.mmap2.len = len;
2307         ev.mmap2.pgoff = pgoff;
2308
2309         ev.mmap2.build_id_size = min(bid->size, sizeof(ev.mmap2.build_id));
2310         memcpy(ev.mmap2.build_id, bid->data, ev.mmap2.build_id_size);
2311
2312         ev.mmap2.prot = prot;
2313         ev.mmap2.flags = flags;
2314
2315         memcpy(ev.mmap2.filename, filename, min(strlen(filename), sizeof(ev.mmap.filename)));
2316
2317         array = &ev;
2318         array += ev.header.size;
2319         ret = perf_event__synthesize_id_sample(array, evsel->core.attr.sample_type, sample);
2320         if (ret < 0)
2321                 return ret;
2322
2323         if (ret & 7) {
2324                 pr_err("Bad id sample size %d\n", ret);
2325                 return -EINVAL;
2326         }
2327
2328         ev.header.size += ret;
2329
2330         return process(tool, &ev, sample, machine);
2331 }
2332
2333 int perf_event__synthesize_stat_events(struct perf_stat_config *config, const struct perf_tool *tool,
2334                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
2335 {
2336         int err;
2337
2338         if (attrs) {
2339                 err = perf_event__synthesize_attrs(tool, evlist, process);
2340                 if (err < 0) {
2341                         pr_err("Couldn't synthesize attrs.\n");
2342                         return err;
2343                 }
2344         }
2345
2346         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
2347         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
2348         if (err < 0) {
2349                 pr_err("Couldn't synthesize thread map.\n");
2350                 return err;
2351         }
2352
2353         err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL);
2354         if (err < 0) {
2355                 pr_err("Couldn't synthesize thread map.\n");
2356                 return err;
2357         }
2358
2359         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
2360         if (err < 0) {
2361                 pr_err("Couldn't synthesize config.\n");
2362                 return err;
2363         }
2364
2365         return 0;
2366 }
2367
2368 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
2369
2370 int perf_event__synthesize_features(const struct perf_tool *tool, struct perf_session *session,
2371                                     struct evlist *evlist, perf_event__handler_t process)
2372 {
2373         struct perf_header *header = &session->header;
2374         struct perf_record_header_feature *fe;
2375         struct feat_fd ff;
2376         size_t sz, sz_hdr;
2377         int feat, ret;
2378
2379         sz_hdr = sizeof(fe->header);
2380         sz = sizeof(union perf_event);
2381         /* get a nice alignment */
2382         sz = PERF_ALIGN(sz, page_size);
2383
2384         memset(&ff, 0, sizeof(ff));
2385
2386         ff.buf = malloc(sz);
2387         if (!ff.buf)
2388                 return -ENOMEM;
2389
2390         ff.size = sz - sz_hdr;
2391         ff.ph = &session->header;
2392
2393         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
2394                 if (!feat_ops[feat].synthesize) {
2395                         pr_debug("No record header feature for header :%d\n", feat);
2396                         continue;
2397                 }
2398
2399                 ff.offset = sizeof(*fe);
2400
2401                 ret = feat_ops[feat].write(&ff, evlist);
2402                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
2403                         pr_debug("Error writing feature\n");
2404                         continue;
2405                 }
2406                 /* ff.buf may have changed due to realloc in do_write() */
2407                 fe = ff.buf;
2408                 memset(fe, 0, sizeof(*fe));
2409
2410                 fe->feat_id = feat;
2411                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
2412                 fe->header.size = ff.offset;
2413
2414                 ret = process(tool, ff.buf, NULL, NULL);
2415                 if (ret) {
2416                         free(ff.buf);
2417                         return ret;
2418                 }
2419         }
2420
2421         /* Send HEADER_LAST_FEATURE mark. */
2422         fe = ff.buf;
2423         fe->feat_id     = HEADER_LAST_FEATURE;
2424         fe->header.type = PERF_RECORD_HEADER_FEATURE;
2425         fe->header.size = sizeof(*fe);
2426
2427         ret = process(tool, ff.buf, NULL, NULL);
2428
2429         free(ff.buf);
2430         return ret;
2431 }
2432
2433 int perf_event__synthesize_for_pipe(const struct perf_tool *tool,
2434                                     struct perf_session *session,
2435                                     struct perf_data *data,
2436                                     perf_event__handler_t process)
2437 {
2438         int err;
2439         int ret = 0;
2440         struct evlist *evlist = session->evlist;
2441
2442         /*
2443          * We need to synthesize events first, because some
2444          * features works on top of them (on report side).
2445          */
2446         err = perf_event__synthesize_attrs(tool, evlist, process);
2447         if (err < 0) {
2448                 pr_err("Couldn't synthesize attrs.\n");
2449                 return err;
2450         }
2451         ret += err;
2452
2453         err = perf_event__synthesize_features(tool, session, evlist, process);
2454         if (err < 0) {
2455                 pr_err("Couldn't synthesize features.\n");
2456                 return err;
2457         }
2458         ret += err;
2459
2460 #ifdef HAVE_LIBTRACEEVENT
2461         if (have_tracepoints(&evlist->core.entries)) {
2462                 int fd = perf_data__fd(data);
2463
2464                 /*
2465                  * FIXME err <= 0 here actually means that
2466                  * there were no tracepoints so its not really
2467                  * an error, just that we don't need to
2468                  * synthesize anything.  We really have to
2469                  * return this more properly and also
2470                  * propagate errors that now are calling die()
2471                  */
2472                 err = perf_event__synthesize_tracing_data(tool, fd, evlist,
2473                                                           process);
2474                 if (err <= 0) {
2475                         pr_err("Couldn't record tracing data.\n");
2476                         return err;
2477                 }
2478                 ret += err;
2479         }
2480 #else
2481         (void)data;
2482 #endif
2483
2484         return ret;
2485 }
2486
2487 int parse_synth_opt(char *synth)
2488 {
2489         char *p, *q;
2490         int ret = 0;
2491
2492         if (synth == NULL)
2493                 return -1;
2494
2495         for (q = synth; (p = strsep(&q, ",")); p = q) {
2496                 if (!strcasecmp(p, "no") || !strcasecmp(p, "none"))
2497                         return 0;
2498
2499                 if (!strcasecmp(p, "all"))
2500                         return PERF_SYNTH_ALL;
2501
2502                 if (!strcasecmp(p, "task"))
2503                         ret |= PERF_SYNTH_TASK;
2504                 else if (!strcasecmp(p, "mmap"))
2505                         ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP;
2506                 else if (!strcasecmp(p, "cgroup"))
2507                         ret |= PERF_SYNTH_CGROUP;
2508                 else
2509                         return -1;
2510         }
2511
2512         return ret;
2513 }