tools/perf/util/synthetic-events.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include "util/debug.h"
   4 #include "util/dso.h"
   5 #include "util/event.h"
   6 #include "util/evlist.h"
   7 #include "util/machine.h"
   8 #include "util/map.h"
   9 #include "util/map_symbol.h"
  10 #include "util/branch.h"
  11 #include "util/memswap.h"
  12 #include "util/namespaces.h"
  13 #include "util/session.h"
  14 #include "util/stat.h"
  15 #include "util/symbol.h"
  16 #include "util/synthetic-events.h"
  17 #include "util/target.h"
  18 #include "util/time-utils.h"
  19 #include <linux/bitops.h>
  20 #include <linux/kernel.h>
  21 #include <linux/string.h>
  22 #include <linux/zalloc.h>
  23 #include <linux/perf_event.h>
  24 #include <asm/bug.h>
  25 #include <perf/evsel.h>
  26 #include <internal/cpumap.h>
  27 #include <perf/cpumap.h>
  28 #include <internal/lib.h> // page_size
  29 #include <internal/threadmap.h>
  30 #include <perf/threadmap.h>
  31 #include <symbol/kallsyms.h>
  32 #include <dirent.h>
  33 #include <errno.h>
  34 #include <inttypes.h>
  35 #include <stdio.h>
  36 #include <string.h>
  37 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */
  38 #include <api/fs/fs.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <fcntl.h>
  42 #include <unistd.h>
  43
  44 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500
  45
  46 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT;
  47
  48 int perf_tool__process_synth_event(struct perf_tool *tool,
  49                                    union perf_event *event,
  50                                    struct machine *machine,
  51                                    perf_event__handler_t process)
  52 {
  53         struct perf_sample synth_sample = {
  54                 .pid       = -1,
  55                 .tid       = -1,
  56                 .time      = -1,
  57                 .stream_id = -1,
  58                 .cpu       = -1,
  59                 .period    = 1,
  60                 .cpumode   = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK,
  61         };
  62
  63         return process(tool, event, &synth_sample, machine);
  64 };
  65
  66 /*
  67  * Assumes that the first 4095 bytes of /proc/pid/stat contains
  68  * the comm, tgid and ppid.
  69  */
  70 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len,
  71                                     pid_t *tgid, pid_t *ppid)
  72 {
  73         char filename[PATH_MAX];
  74         char bf[4096];
  75         int fd;
  76         size_t size = 0;
  77         ssize_t n;
  78         char *name, *tgids, *ppids;
  79
  80         *tgid = -1;
  81         *ppid = -1;
  82
  83         snprintf(filename, sizeof(filename), "/proc/%d/status", pid);
  84
  85         fd = open(filename, O_RDONLY);
  86         if (fd < 0) {
  87                 pr_debug("couldn't open %s\n", filename);
  88                 return -1;
  89         }
  90
  91         n = read(fd, bf, sizeof(bf) - 1);
  92         close(fd);
  93         if (n <= 0) {
  94                 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n",
  95                            pid);
  96                 return -1;
  97         }
  98         bf[n] = '\0';
  99
 100         name = strstr(bf, "Name:");
 101         tgids = strstr(bf, "Tgid:");
 102         ppids = strstr(bf, "PPid:");
 103
 104         if (name) {
 105                 char *nl;
 106
 107                 name = skip_spaces(name + 5);  /* strlen("Name:") */
 108                 nl = strchr(name, '\n');
 109                 if (nl)
 110                         *nl = '\0';
 111
 112                 size = strlen(name);
 113                 if (size >= len)
 114                         size = len - 1;
 115                 memcpy(comm, name, size);
 116                 comm[size] = '\0';
 117         } else {
 118                 pr_debug("Name: string not found for pid %d\n", pid);
 119         }
 120
 121         if (tgids) {
 122                 tgids += 5;  /* strlen("Tgid:") */
 123                 *tgid = atoi(tgids);
 124         } else {
 125                 pr_debug("Tgid: string not found for pid %d\n", pid);
 126         }
 127
 128         if (ppids) {
 129                 ppids += 5;  /* strlen("PPid:") */
 130                 *ppid = atoi(ppids);
 131         } else {
 132                 pr_debug("PPid: string not found for pid %d\n", pid);
 133         }
 134
 135         return 0;
 136 }
 137
 138 static int perf_event__prepare_comm(union perf_event *event, pid_t pid,
 139                                     struct machine *machine,
 140                                     pid_t *tgid, pid_t *ppid)
 141 {
 142         size_t size;
 143
 144         *ppid = -1;
 145
 146         memset(&event->comm, 0, sizeof(event->comm));
 147
 148         if (machine__is_host(machine)) {
 149                 if (perf_event__get_comm_ids(pid, event->comm.comm,
 150                                              sizeof(event->comm.comm),
 151                                              tgid, ppid) != 0) {
 152                         return -1;
 153                 }
 154         } else {
 155                 *tgid = machine->pid;
 156         }
 157
 158         if (*tgid < 0)
 159                 return -1;
 160
 161         event->comm.pid = *tgid;
 162         event->comm.header.type = PERF_RECORD_COMM;
 163
 164         size = strlen(event->comm.comm) + 1;
 165         size = PERF_ALIGN(size, sizeof(u64));
 166         memset(event->comm.comm + size, 0, machine->id_hdr_size);
 167         event->comm.header.size = (sizeof(event->comm) -
 168                                 (sizeof(event->comm.comm) - size) +
 169                                 machine->id_hdr_size);
 170         event->comm.tid = pid;
 171
 172         return 0;
 173 }
 174
 175 pid_t perf_event__synthesize_comm(struct perf_tool *tool,
 176                                          union perf_event *event, pid_t pid,
 177                                          perf_event__handler_t process,
 178                                          struct machine *machine)
 179 {
 180         pid_t tgid, ppid;
 181
 182         if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0)
 183                 return -1;
 184
 185         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 186                 return -1;
 187
 188         return tgid;
 189 }
 190
 191 static void perf_event__get_ns_link_info(pid_t pid, const char *ns,
 192                                          struct perf_ns_link_info *ns_link_info)
 193 {
 194         struct stat64 st;
 195         char proc_ns[128];
 196
 197         sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns);
 198         if (stat64(proc_ns, &st) == 0) {
 199                 ns_link_info->dev = st.st_dev;
 200                 ns_link_info->ino = st.st_ino;
 201         }
 202 }
 203
 204 int perf_event__synthesize_namespaces(struct perf_tool *tool,
 205                                       union perf_event *event,
 206                                       pid_t pid, pid_t tgid,
 207                                       perf_event__handler_t process,
 208                                       struct machine *machine)
 209 {
 210         u32 idx;
 211         struct perf_ns_link_info *ns_link_info;
 212
 213         if (!tool || !tool->namespace_events)
 214                 return 0;
 215
 216         memset(&event->namespaces, 0, (sizeof(event->namespaces) +
 217                (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 218                machine->id_hdr_size));
 219
 220         event->namespaces.pid = tgid;
 221         event->namespaces.tid = pid;
 222
 223         event->namespaces.nr_namespaces = NR_NAMESPACES;
 224
 225         ns_link_info = event->namespaces.link_info;
 226
 227         for (idx = 0; idx < event->namespaces.nr_namespaces; idx++)
 228                 perf_event__get_ns_link_info(pid, perf_ns__name(idx),
 229                                              &ns_link_info[idx]);
 230
 231         event->namespaces.header.type = PERF_RECORD_NAMESPACES;
 232
 233         event->namespaces.header.size = (sizeof(event->namespaces) +
 234                         (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 235                         machine->id_hdr_size);
 236
 237         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 238                 return -1;
 239
 240         return 0;
 241 }
 242
 243 static int perf_event__synthesize_fork(struct perf_tool *tool,
 244                                        union perf_event *event,
 245                                        pid_t pid, pid_t tgid, pid_t ppid,
 246                                        perf_event__handler_t process,
 247                                        struct machine *machine)
 248 {
 249         memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size);
 250
 251         /*
 252          * for main thread set parent to ppid from status file. For other
 253          * threads set parent pid to main thread. ie., assume main thread
 254          * spawns all threads in a process
 255         */
 256         if (tgid == pid) {
 257                 event->fork.ppid = ppid;
 258                 event->fork.ptid = ppid;
 259         } else {
 260                 event->fork.ppid = tgid;
 261                 event->fork.ptid = tgid;
 262         }
 263         event->fork.pid  = tgid;
 264         event->fork.tid  = pid;
 265         event->fork.header.type = PERF_RECORD_FORK;
 266         event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC;
 267
 268         event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size);
 269
 270         if (perf_tool__process_synth_event(tool, event, machine, process) != 0)
 271                 return -1;
 272
 273         return 0;
 274 }
 275
 276 int perf_event__synthesize_mmap_events(struct perf_tool *tool,
 277                                        union perf_event *event,
 278                                        pid_t pid, pid_t tgid,
 279                                        perf_event__handler_t process,
 280                                        struct machine *machine,
 281                                        bool mmap_data)
 282 {
 283         char filename[PATH_MAX];
 284         FILE *fp;
 285         unsigned long long t;
 286         bool truncation = false;
 287         unsigned long long timeout = proc_map_timeout * 1000000ULL;
 288         int rc = 0;
 289         const char *hugetlbfs_mnt = hugetlbfs__mountpoint();
 290         int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0;
 291
 292         if (machine__is_default_guest(machine))
 293                 return 0;
 294
 295         snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps",
 296                  machine->root_dir, pid, pid);
 297
 298         fp = fopen(filename, "r");
 299         if (fp == NULL) {
 300                 /*
 301                  * We raced with a task exiting - just return:
 302                  */
 303                 pr_debug("couldn't open %s\n", filename);
 304                 return -1;
 305         }
 306
 307         event->header.type = PERF_RECORD_MMAP2;
 308         t = rdclock();
 309
 310         while (1) {
 311                 char bf[BUFSIZ];
 312                 char prot[5];
 313                 char execname[PATH_MAX];
 314                 char anonstr[] = "//anon";
 315                 unsigned int ino;
 316                 size_t size;
 317                 ssize_t n;
 318
 319                 if (fgets(bf, sizeof(bf), fp) == NULL)
 320                         break;
 321
 322                 if ((rdclock() - t) > timeout) {
 323                         pr_warning("Reading %s time out. "
 324                                    "You may want to increase "
 325                                    "the time limit by --proc-map-timeout\n",
 326                                    filename);
 327                         truncation = true;
 328                         goto out;
 329                 }
 330
 331                 /* ensure null termination since stack will be reused. */
 332                 strcpy(execname, "");
 333
 334                 /* 00400000-0040c000 r-xp 00000000 fd:01 41038  /bin/cat */
 335                 n = sscanf(bf, "%"PRI_lx64"-%"PRI_lx64" %s %"PRI_lx64" %x:%x %u %[^\n]\n",
 336                        &event->mmap2.start, &event->mmap2.len, prot,
 337                        &event->mmap2.pgoff, &event->mmap2.maj,
 338                        &event->mmap2.min,
 339                        &ino, execname);
 340
 341                 /*
 342                  * Anon maps don't have the execname.
 343                  */
 344                 if (n < 7)
 345                         continue;
 346
 347                 event->mmap2.ino = (u64)ino;
 348
 349                 /*
 350                  * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c
 351                  */
 352                 if (machine__is_host(machine))
 353                         event->header.misc = PERF_RECORD_MISC_USER;
 354                 else
 355                         event->header.misc = PERF_RECORD_MISC_GUEST_USER;
 356
 357                 /* map protection and flags bits */
 358                 event->mmap2.prot = 0;
 359                 event->mmap2.flags = 0;
 360                 if (prot[0] == 'r')
 361                         event->mmap2.prot |= PROT_READ;
 362                 if (prot[1] == 'w')
 363                         event->mmap2.prot |= PROT_WRITE;
 364                 if (prot[2] == 'x')
 365                         event->mmap2.prot |= PROT_EXEC;
 366
 367                 if (prot[3] == 's')
 368                         event->mmap2.flags |= MAP_SHARED;
 369                 else
 370                         event->mmap2.flags |= MAP_PRIVATE;
 371
 372                 if (prot[2] != 'x') {
 373                         if (!mmap_data || prot[0] != 'r')
 374                                 continue;
 375
 376                         event->header.misc |= PERF_RECORD_MISC_MMAP_DATA;
 377                 }
 378
 379 out:
 380                 if (truncation)
 381                         event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT;
 382
 383                 if (!strcmp(execname, ""))
 384                         strcpy(execname, anonstr);
 385
 386                 if (hugetlbfs_mnt_len &&
 387                     !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) {
 388                         strcpy(execname, anonstr);
 389                         event->mmap2.flags |= MAP_HUGETLB;
 390                 }
 391
 392                 size = strlen(execname) + 1;
 393                 memcpy(event->mmap2.filename, execname, size);
 394                 size = PERF_ALIGN(size, sizeof(u64));
 395                 event->mmap2.len -= event->mmap.start;
 396                 event->mmap2.header.size = (sizeof(event->mmap2) -
 397                                         (sizeof(event->mmap2.filename) - size));
 398                 memset(event->mmap2.filename + size, 0, machine->id_hdr_size);
 399                 event->mmap2.header.size += machine->id_hdr_size;
 400                 event->mmap2.pid = tgid;
 401                 event->mmap2.tid = pid;
 402
 403                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 404                         rc = -1;
 405                         break;
 406                 }
 407
 408                 if (truncation)
 409                         break;
 410         }
 411
 412         fclose(fp);
 413         return rc;
 414 }
 415
 416 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process,
 417                                    struct machine *machine)
 418 {
 419         int rc = 0;
 420         struct map *pos;
 421         struct maps *maps = machine__kernel_maps(machine);
 422         union perf_event *event = zalloc((sizeof(event->mmap) +
 423                                           machine->id_hdr_size));
 424         if (event == NULL) {
 425                 pr_debug("Not enough memory synthesizing mmap event "
 426                          "for kernel modules\n");
 427                 return -1;
 428         }
 429
 430         event->header.type = PERF_RECORD_MMAP;
 431
 432         /*
 433          * kernel uses 0 for user space maps, see kernel/perf_event.c
 434          * __perf_event_mmap
 435          */
 436         if (machine__is_host(machine))
 437                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 438         else
 439                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 440
 441         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
 442                 size_t size;
 443
 444                 if (!__map__is_kmodule(pos))
 445                         continue;
 446
 447                 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
 448                 event->mmap.header.type = PERF_RECORD_MMAP;
 449                 event->mmap.header.size = (sizeof(event->mmap) -
 450                                         (sizeof(event->mmap.filename) - size));
 451                 memset(event->mmap.filename + size, 0, machine->id_hdr_size);
 452                 event->mmap.header.size += machine->id_hdr_size;
 453                 event->mmap.start = pos->start;
 454                 event->mmap.len   = pos->end - pos->start;
 455                 event->mmap.pid   = machine->pid;
 456
 457                 memcpy(event->mmap.filename, pos->dso->long_name,
 458                        pos->dso->long_name_len + 1);
 459                 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) {
 460                         rc = -1;
 461                         break;
 462                 }
 463         }
 464
 465         free(event);
 466         return rc;
 467 }
 468
 469 static int __event__synthesize_thread(union perf_event *comm_event,
 470                                       union perf_event *mmap_event,
 471                                       union perf_event *fork_event,
 472                                       union perf_event *namespaces_event,
 473                                       pid_t pid, int full, perf_event__handler_t process,
 474                                       struct perf_tool *tool, struct machine *machine, bool mmap_data)
 475 {
 476         char filename[PATH_MAX];
 477         DIR *tasks;
 478         struct dirent *dirent;
 479         pid_t tgid, ppid;
 480         int rc = 0;
 481
 482         /* special case: only send one comm event using passed in pid */
 483         if (!full) {
 484                 tgid = perf_event__synthesize_comm(tool, comm_event, pid,
 485                                                    process, machine);
 486
 487                 if (tgid == -1)
 488                         return -1;
 489
 490                 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid,
 491                                                       tgid, process, machine) < 0)
 492                         return -1;
 493
 494                 /*
 495                  * send mmap only for thread group leader
 496                  * see thread__init_map_groups
 497                  */
 498                 if (pid == tgid &&
 499                     perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 500                                                        process, machine, mmap_data))
 501                         return -1;
 502
 503                 return 0;
 504         }
 505
 506         if (machine__is_default_guest(machine))
 507                 return 0;
 508
 509         snprintf(filename, sizeof(filename), "%s/proc/%d/task",
 510                  machine->root_dir, pid);
 511
 512         tasks = opendir(filename);
 513         if (tasks == NULL) {
 514                 pr_debug("couldn't open %s\n", filename);
 515                 return 0;
 516         }
 517
 518         while ((dirent = readdir(tasks)) != NULL) {
 519                 char *end;
 520                 pid_t _pid;
 521
 522                 _pid = strtol(dirent->d_name, &end, 10);
 523                 if (*end)
 524                         continue;
 525
 526                 rc = -1;
 527                 if (perf_event__prepare_comm(comm_event, _pid, machine,
 528                                              &tgid, &ppid) != 0)
 529                         break;
 530
 531                 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid,
 532                                                 ppid, process, machine) < 0)
 533                         break;
 534
 535                 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid,
 536                                                       tgid, process, machine) < 0)
 537                         break;
 538
 539                 /*
 540                  * Send the prepared comm event
 541                  */
 542                 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0)
 543                         break;
 544
 545                 rc = 0;
 546                 if (_pid == pid) {
 547                         /* process the parent's maps too */
 548                         rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid,
 549                                                 process, machine, mmap_data);
 550                         if (rc)
 551                                 break;
 552                 }
 553         }
 554
 555         closedir(tasks);
 556         return rc;
 557 }
 558
 559 int perf_event__synthesize_thread_map(struct perf_tool *tool,
 560                                       struct perf_thread_map *threads,
 561                                       perf_event__handler_t process,
 562                                       struct machine *machine,
 563                                       bool mmap_data)
 564 {
 565         union perf_event *comm_event, *mmap_event, *fork_event;
 566         union perf_event *namespaces_event;
 567         int err = -1, thread, j;
 568
 569         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 570         if (comm_event == NULL)
 571                 goto out;
 572
 573         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 574         if (mmap_event == NULL)
 575                 goto out_free_comm;
 576
 577         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 578         if (fork_event == NULL)
 579                 goto out_free_mmap;
 580
 581         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 582                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 583                                   machine->id_hdr_size);
 584         if (namespaces_event == NULL)
 585                 goto out_free_fork;
 586
 587         err = 0;
 588         for (thread = 0; thread < threads->nr; ++thread) {
 589                 if (__event__synthesize_thread(comm_event, mmap_event,
 590                                                fork_event, namespaces_event,
 591                                                perf_thread_map__pid(threads, thread), 0,
 592                                                process, tool, machine,
 593                                                mmap_data)) {
 594                         err = -1;
 595                         break;
 596                 }
 597
 598                 /*
 599                  * comm.pid is set to thread group id by
 600                  * perf_event__synthesize_comm
 601                  */
 602                 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) {
 603                         bool need_leader = true;
 604
 605                         /* is thread group leader in thread_map? */
 606                         for (j = 0; j < threads->nr; ++j) {
 607                                 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) {
 608                                         need_leader = false;
 609                                         break;
 610                                 }
 611                         }
 612
 613                         /* if not, generate events for it */
 614                         if (need_leader &&
 615                             __event__synthesize_thread(comm_event, mmap_event,
 616                                                        fork_event, namespaces_event,
 617                                                        comm_event->comm.pid, 0,
 618                                                        process, tool, machine,
 619                                                        mmap_data)) {
 620                                 err = -1;
 621                                 break;
 622                         }
 623                 }
 624         }
 625         free(namespaces_event);
 626 out_free_fork:
 627         free(fork_event);
 628 out_free_mmap:
 629         free(mmap_event);
 630 out_free_comm:
 631         free(comm_event);
 632 out:
 633         return err;
 634 }
 635
 636 static int __perf_event__synthesize_threads(struct perf_tool *tool,
 637                                             perf_event__handler_t process,
 638                                             struct machine *machine,
 639                                             bool mmap_data,
 640                                             struct dirent **dirent,
 641                                             int start,
 642                                             int num)
 643 {
 644         union perf_event *comm_event, *mmap_event, *fork_event;
 645         union perf_event *namespaces_event;
 646         int err = -1;
 647         char *end;
 648         pid_t pid;
 649         int i;
 650
 651         comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size);
 652         if (comm_event == NULL)
 653                 goto out;
 654
 655         mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size);
 656         if (mmap_event == NULL)
 657                 goto out_free_comm;
 658
 659         fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size);
 660         if (fork_event == NULL)
 661                 goto out_free_mmap;
 662
 663         namespaces_event = malloc(sizeof(namespaces_event->namespaces) +
 664                                   (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) +
 665                                   machine->id_hdr_size);
 666         if (namespaces_event == NULL)
 667                 goto out_free_fork;
 668
 669         for (i = start; i < start + num; i++) {
 670                 if (!isdigit(dirent[i]->d_name[0]))
 671                         continue;
 672
 673                 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10);
 674                 /* only interested in proper numerical dirents */
 675                 if (*end)
 676                         continue;
 677                 /*
 678                  * We may race with exiting thread, so don't stop just because
 679                  * one thread couldn't be synthesized.
 680                  */
 681                 __event__synthesize_thread(comm_event, mmap_event, fork_event,
 682                                            namespaces_event, pid, 1, process,
 683                                            tool, machine, mmap_data);
 684         }
 685         err = 0;
 686
 687         free(namespaces_event);
 688 out_free_fork:
 689         free(fork_event);
 690 out_free_mmap:
 691         free(mmap_event);
 692 out_free_comm:
 693         free(comm_event);
 694 out:
 695         return err;
 696 }
 697
 698 struct synthesize_threads_arg {
 699         struct perf_tool *tool;
 700         perf_event__handler_t process;
 701         struct machine *machine;
 702         bool mmap_data;
 703         struct dirent **dirent;
 704         int num;
 705         int start;
 706 };
 707
 708 static void *synthesize_threads_worker(void *arg)
 709 {
 710         struct synthesize_threads_arg *args = arg;
 711
 712         __perf_event__synthesize_threads(args->tool, args->process,
 713                                          args->machine, args->mmap_data,
 714                                          args->dirent,
 715                                          args->start, args->num);
 716         return NULL;
 717 }
 718
 719 int perf_event__synthesize_threads(struct perf_tool *tool,
 720                                    perf_event__handler_t process,
 721                                    struct machine *machine,
 722                                    bool mmap_data,
 723                                    unsigned int nr_threads_synthesize)
 724 {
 725         struct synthesize_threads_arg *args = NULL;
 726         pthread_t *synthesize_threads = NULL;
 727         char proc_path[PATH_MAX];
 728         struct dirent **dirent;
 729         int num_per_thread;
 730         int m, n, i, j;
 731         int thread_nr;
 732         int base = 0;
 733         int err = -1;
 734
 735
 736         if (machine__is_default_guest(machine))
 737                 return 0;
 738
 739         snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir);
 740         n = scandir(proc_path, &dirent, 0, alphasort);
 741         if (n < 0)
 742                 return err;
 743
 744         if (nr_threads_synthesize == UINT_MAX)
 745                 thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
 746         else
 747                 thread_nr = nr_threads_synthesize;
 748
 749         if (thread_nr <= 1) {
 750                 err = __perf_event__synthesize_threads(tool, process,
 751                                                        machine, mmap_data,
 752                                                        dirent, base, n);
 753                 goto free_dirent;
 754         }
 755         if (thread_nr > n)
 756                 thread_nr = n;
 757
 758         synthesize_threads = calloc(sizeof(pthread_t), thread_nr);
 759         if (synthesize_threads == NULL)
 760                 goto free_dirent;
 761
 762         args = calloc(sizeof(*args), thread_nr);
 763         if (args == NULL)
 764                 goto free_threads;
 765
 766         num_per_thread = n / thread_nr;
 767         m = n % thread_nr;
 768         for (i = 0; i < thread_nr; i++) {
 769                 args[i].tool = tool;
 770                 args[i].process = process;
 771                 args[i].machine = machine;
 772                 args[i].mmap_data = mmap_data;
 773                 args[i].dirent = dirent;
 774         }
 775         for (i = 0; i < m; i++) {
 776                 args[i].num = num_per_thread + 1;
 777                 args[i].start = i * args[i].num;
 778         }
 779         if (i != 0)
 780                 base = args[i-1].start + args[i-1].num;
 781         for (j = i; j < thread_nr; j++) {
 782                 args[j].num = num_per_thread;
 783                 args[j].start = base + (j - i) * args[i].num;
 784         }
 785
 786         for (i = 0; i < thread_nr; i++) {
 787                 if (pthread_create(&synthesize_threads[i], NULL,
 788                                    synthesize_threads_worker, &args[i]))
 789                         goto out_join;
 790         }
 791         err = 0;
 792 out_join:
 793         for (i = 0; i < thread_nr; i++)
 794                 pthread_join(synthesize_threads[i], NULL);
 795         free(args);
 796 free_threads:
 797         free(synthesize_threads);
 798 free_dirent:
 799         for (i = 0; i < n; i++)
 800                 zfree(&dirent[i]);
 801         free(dirent);
 802
 803         return err;
 804 }
 805
 806 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused,
 807                                               perf_event__handler_t process __maybe_unused,
 808                                               struct machine *machine __maybe_unused)
 809 {
 810         return 0;
 811 }
 812
 813 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 814                                                 perf_event__handler_t process,
 815                                                 struct machine *machine)
 816 {
 817         size_t size;
 818         struct map *map = machine__kernel_map(machine);
 819         struct kmap *kmap;
 820         int err;
 821         union perf_event *event;
 822
 823         if (map == NULL)
 824                 return -1;
 825
 826         kmap = map__kmap(map);
 827         if (!kmap->ref_reloc_sym)
 828                 return -1;
 829
 830         /*
 831          * We should get this from /sys/kernel/sections/.text, but till that is
 832          * available use this, and after it is use this as a fallback for older
 833          * kernels.
 834          */
 835         event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
 836         if (event == NULL) {
 837                 pr_debug("Not enough memory synthesizing mmap event "
 838                          "for kernel modules\n");
 839                 return -1;
 840         }
 841
 842         if (machine__is_host(machine)) {
 843                 /*
 844                  * kernel uses PERF_RECORD_MISC_USER for user space maps,
 845                  * see kernel/perf_event.c __perf_event_mmap
 846                  */
 847                 event->header.misc = PERF_RECORD_MISC_KERNEL;
 848         } else {
 849                 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
 850         }
 851
 852         size = snprintf(event->mmap.filename, sizeof(event->mmap.filename),
 853                         "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1;
 854         size = PERF_ALIGN(size, sizeof(u64));
 855         event->mmap.header.type = PERF_RECORD_MMAP;
 856         event->mmap.header.size = (sizeof(event->mmap) -
 857                         (sizeof(event->mmap.filename) - size) + machine->id_hdr_size);
 858         event->mmap.pgoff = kmap->ref_reloc_sym->addr;
 859         event->mmap.start = map->start;
 860         event->mmap.len   = map->end - event->mmap.start;
 861         event->mmap.pid   = machine->pid;
 862
 863         err = perf_tool__process_synth_event(tool, event, machine, process);
 864         free(event);
 865
 866         return err;
 867 }
 868
 869 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
 870                                        perf_event__handler_t process,
 871                                        struct machine *machine)
 872 {
 873         int err;
 874
 875         err = __perf_event__synthesize_kernel_mmap(tool, process, machine);
 876         if (err < 0)
 877                 return err;
 878
 879         return perf_event__synthesize_extra_kmaps(tool, process, machine);
 880 }
 881
 882 int perf_event__synthesize_thread_map2(struct perf_tool *tool,
 883                                       struct perf_thread_map *threads,
 884                                       perf_event__handler_t process,
 885                                       struct machine *machine)
 886 {
 887         union perf_event *event;
 888         int i, err, size;
 889
 890         size  = sizeof(event->thread_map);
 891         size += threads->nr * sizeof(event->thread_map.entries[0]);
 892
 893         event = zalloc(size);
 894         if (!event)
 895                 return -ENOMEM;
 896
 897         event->header.type = PERF_RECORD_THREAD_MAP;
 898         event->header.size = size;
 899         event->thread_map.nr = threads->nr;
 900
 901         for (i = 0; i < threads->nr; i++) {
 902                 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i];
 903                 char *comm = perf_thread_map__comm(threads, i);
 904
 905                 if (!comm)
 906                         comm = (char *) "";
 907
 908                 entry->pid = perf_thread_map__pid(threads, i);
 909                 strncpy((char *) &entry->comm, comm, sizeof(entry->comm));
 910         }
 911
 912         err = process(tool, event, NULL, machine);
 913
 914         free(event);
 915         return err;
 916 }
 917
 918 static void synthesize_cpus(struct cpu_map_entries *cpus,
 919                             struct perf_cpu_map *map)
 920 {
 921         int i;
 922
 923         cpus->nr = map->nr;
 924
 925         for (i = 0; i < map->nr; i++)
 926                 cpus->cpu[i] = map->map[i];
 927 }
 928
 929 static void synthesize_mask(struct perf_record_record_cpu_map *mask,
 930                             struct perf_cpu_map *map, int max)
 931 {
 932         int i;
 933
 934         mask->nr = BITS_TO_LONGS(max);
 935         mask->long_size = sizeof(long);
 936
 937         for (i = 0; i < map->nr; i++)
 938                 set_bit(map->map[i], mask->mask);
 939 }
 940
 941 static size_t cpus_size(struct perf_cpu_map *map)
 942 {
 943         return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16);
 944 }
 945
 946 static size_t mask_size(struct perf_cpu_map *map, int *max)
 947 {
 948         int i;
 949
 950         *max = 0;
 951
 952         for (i = 0; i < map->nr; i++) {
 953                 /* bit possition of the cpu is + 1 */
 954                 int bit = map->map[i] + 1;
 955
 956                 if (bit > *max)
 957                         *max = bit;
 958         }
 959
 960         return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
 961 }
 962
 963 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max)
 964 {
 965         size_t size_cpus, size_mask;
 966         bool is_dummy = perf_cpu_map__empty(map);
 967
 968         /*
 969          * Both array and mask data have variable size based
 970          * on the number of cpus and their actual values.
 971          * The size of the 'struct perf_record_cpu_map_data' is:
 972          *
 973          *   array = size of 'struct cpu_map_entries' +
 974          *           number of cpus * sizeof(u64)
 975          *
 976          *   mask  = size of 'struct perf_record_record_cpu_map' +
 977          *           maximum cpu bit converted to size of longs
 978          *
 979          * and finaly + the size of 'struct perf_record_cpu_map_data'.
 980          */
 981         size_cpus = cpus_size(map);
 982         size_mask = mask_size(map, max);
 983
 984         if (is_dummy || (size_cpus < size_mask)) {
 985                 *size += size_cpus;
 986                 *type  = PERF_CPU_MAP__CPUS;
 987         } else {
 988                 *size += size_mask;
 989                 *type  = PERF_CPU_MAP__MASK;
 990         }
 991
 992         *size += sizeof(struct perf_record_cpu_map_data);
 993         *size = PERF_ALIGN(*size, sizeof(u64));
 994         return zalloc(*size);
 995 }
 996
 997 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map,
 998                               u16 type, int max)
 999 {
1000         data->type = type;
1001
1002         switch (type) {
1003         case PERF_CPU_MAP__CPUS:
1004                 synthesize_cpus((struct cpu_map_entries *) data->data, map);
1005                 break;
1006         case PERF_CPU_MAP__MASK:
1007                 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max);
1008         default:
1009                 break;
1010         };
1011 }
1012
1013 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map)
1014 {
1015         size_t size = sizeof(struct perf_record_cpu_map);
1016         struct perf_record_cpu_map *event;
1017         int max;
1018         u16 type;
1019
1020         event = cpu_map_data__alloc(map, &size, &type, &max);
1021         if (!event)
1022                 return NULL;
1023
1024         event->header.type = PERF_RECORD_CPU_MAP;
1025         event->header.size = size;
1026         event->data.type   = type;
1027
1028         cpu_map_data__synthesize(&event->data, map, type, max);
1029         return event;
1030 }
1031
1032 int perf_event__synthesize_cpu_map(struct perf_tool *tool,
1033                                    struct perf_cpu_map *map,
1034                                    perf_event__handler_t process,
1035                                    struct machine *machine)
1036 {
1037         struct perf_record_cpu_map *event;
1038         int err;
1039
1040         event = cpu_map_event__new(map);
1041         if (!event)
1042                 return -ENOMEM;
1043
1044         err = process(tool, (union perf_event *) event, NULL, machine);
1045
1046         free(event);
1047         return err;
1048 }
1049
1050 int perf_event__synthesize_stat_config(struct perf_tool *tool,
1051                                        struct perf_stat_config *config,
1052                                        perf_event__handler_t process,
1053                                        struct machine *machine)
1054 {
1055         struct perf_record_stat_config *event;
1056         int size, i = 0, err;
1057
1058         size  = sizeof(*event);
1059         size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0]));
1060
1061         event = zalloc(size);
1062         if (!event)
1063                 return -ENOMEM;
1064
1065         event->header.type = PERF_RECORD_STAT_CONFIG;
1066         event->header.size = size;
1067         event->nr          = PERF_STAT_CONFIG_TERM__MAX;
1068
1069 #define ADD(__term, __val)                                      \
1070         event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term;   \
1071         event->data[i].val = __val;                             \
1072         i++;
1073
1074         ADD(AGGR_MODE,  config->aggr_mode)
1075         ADD(INTERVAL,   config->interval)
1076         ADD(SCALE,      config->scale)
1077
1078         WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX,
1079                   "stat config terms unbalanced\n");
1080 #undef ADD
1081
1082         err = process(tool, (union perf_event *) event, NULL, machine);
1083
1084         free(event);
1085         return err;
1086 }
1087
1088 int perf_event__synthesize_stat(struct perf_tool *tool,
1089                                 u32 cpu, u32 thread, u64 id,
1090                                 struct perf_counts_values *count,
1091                                 perf_event__handler_t process,
1092                                 struct machine *machine)
1093 {
1094         struct perf_record_stat event;
1095
1096         event.header.type = PERF_RECORD_STAT;
1097         event.header.size = sizeof(event);
1098         event.header.misc = 0;
1099
1100         event.id        = id;
1101         event.cpu       = cpu;
1102         event.thread    = thread;
1103         event.val       = count->val;
1104         event.ena       = count->ena;
1105         event.run       = count->run;
1106
1107         return process(tool, (union perf_event *) &event, NULL, machine);
1108 }
1109
1110 int perf_event__synthesize_stat_round(struct perf_tool *tool,
1111                                       u64 evtime, u64 type,
1112                                       perf_event__handler_t process,
1113                                       struct machine *machine)
1114 {
1115         struct perf_record_stat_round event;
1116
1117         event.header.type = PERF_RECORD_STAT_ROUND;
1118         event.header.size = sizeof(event);
1119         event.header.misc = 0;
1120
1121         event.time = evtime;
1122         event.type = type;
1123
1124         return process(tool, (union perf_event *) &event, NULL, machine);
1125 }
1126
1127 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format)
1128 {
1129         size_t sz, result = sizeof(struct perf_record_sample);
1130
1131         if (type & PERF_SAMPLE_IDENTIFIER)
1132                 result += sizeof(u64);
1133
1134         if (type & PERF_SAMPLE_IP)
1135                 result += sizeof(u64);
1136
1137         if (type & PERF_SAMPLE_TID)
1138                 result += sizeof(u64);
1139
1140         if (type & PERF_SAMPLE_TIME)
1141                 result += sizeof(u64);
1142
1143         if (type & PERF_SAMPLE_ADDR)
1144                 result += sizeof(u64);
1145
1146         if (type & PERF_SAMPLE_ID)
1147                 result += sizeof(u64);
1148
1149         if (type & PERF_SAMPLE_STREAM_ID)
1150                 result += sizeof(u64);
1151
1152         if (type & PERF_SAMPLE_CPU)
1153                 result += sizeof(u64);
1154
1155         if (type & PERF_SAMPLE_PERIOD)
1156                 result += sizeof(u64);
1157
1158         if (type & PERF_SAMPLE_READ) {
1159                 result += sizeof(u64);
1160                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1161                         result += sizeof(u64);
1162                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1163                         result += sizeof(u64);
1164                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1165                 if (read_format & PERF_FORMAT_GROUP) {
1166                         sz = sample->read.group.nr *
1167                              sizeof(struct sample_read_value);
1168                         result += sz;
1169                 } else {
1170                         result += sizeof(u64);
1171                 }
1172         }
1173
1174         if (type & PERF_SAMPLE_CALLCHAIN) {
1175                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1176                 result += sz;
1177         }
1178
1179         if (type & PERF_SAMPLE_RAW) {
1180                 result += sizeof(u32);
1181                 result += sample->raw_size;
1182         }
1183
1184         if (type & PERF_SAMPLE_BRANCH_STACK) {
1185                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1186                 sz += sizeof(u64);
1187                 result += sz;
1188         }
1189
1190         if (type & PERF_SAMPLE_REGS_USER) {
1191                 if (sample->user_regs.abi) {
1192                         result += sizeof(u64);
1193                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1194                         result += sz;
1195                 } else {
1196                         result += sizeof(u64);
1197                 }
1198         }
1199
1200         if (type & PERF_SAMPLE_STACK_USER) {
1201                 sz = sample->user_stack.size;
1202                 result += sizeof(u64);
1203                 if (sz) {
1204                         result += sz;
1205                         result += sizeof(u64);
1206                 }
1207         }
1208
1209         if (type & PERF_SAMPLE_WEIGHT)
1210                 result += sizeof(u64);
1211
1212         if (type & PERF_SAMPLE_DATA_SRC)
1213                 result += sizeof(u64);
1214
1215         if (type & PERF_SAMPLE_TRANSACTION)
1216                 result += sizeof(u64);
1217
1218         if (type & PERF_SAMPLE_REGS_INTR) {
1219                 if (sample->intr_regs.abi) {
1220                         result += sizeof(u64);
1221                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1222                         result += sz;
1223                 } else {
1224                         result += sizeof(u64);
1225                 }
1226         }
1227
1228         if (type & PERF_SAMPLE_PHYS_ADDR)
1229                 result += sizeof(u64);
1230
1231         return result;
1232 }
1233
1234 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format,
1235                                   const struct perf_sample *sample)
1236 {
1237         __u64 *array;
1238         size_t sz;
1239         /*
1240          * used for cross-endian analysis. See git commit 65014ab3
1241          * for why this goofiness is needed.
1242          */
1243         union u64_swap u;
1244
1245         array = event->sample.array;
1246
1247         if (type & PERF_SAMPLE_IDENTIFIER) {
1248                 *array = sample->id;
1249                 array++;
1250         }
1251
1252         if (type & PERF_SAMPLE_IP) {
1253                 *array = sample->ip;
1254                 array++;
1255         }
1256
1257         if (type & PERF_SAMPLE_TID) {
1258                 u.val32[0] = sample->pid;
1259                 u.val32[1] = sample->tid;
1260                 *array = u.val64;
1261                 array++;
1262         }
1263
1264         if (type & PERF_SAMPLE_TIME) {
1265                 *array = sample->time;
1266                 array++;
1267         }
1268
1269         if (type & PERF_SAMPLE_ADDR) {
1270                 *array = sample->addr;
1271                 array++;
1272         }
1273
1274         if (type & PERF_SAMPLE_ID) {
1275                 *array = sample->id;
1276                 array++;
1277         }
1278
1279         if (type & PERF_SAMPLE_STREAM_ID) {
1280                 *array = sample->stream_id;
1281                 array++;
1282         }
1283
1284         if (type & PERF_SAMPLE_CPU) {
1285                 u.val32[0] = sample->cpu;
1286                 u.val32[1] = 0;
1287                 *array = u.val64;
1288                 array++;
1289         }
1290
1291         if (type & PERF_SAMPLE_PERIOD) {
1292                 *array = sample->period;
1293                 array++;
1294         }
1295
1296         if (type & PERF_SAMPLE_READ) {
1297                 if (read_format & PERF_FORMAT_GROUP)
1298                         *array = sample->read.group.nr;
1299                 else
1300                         *array = sample->read.one.value;
1301                 array++;
1302
1303                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1304                         *array = sample->read.time_enabled;
1305                         array++;
1306                 }
1307
1308                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1309                         *array = sample->read.time_running;
1310                         array++;
1311                 }
1312
1313                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1314                 if (read_format & PERF_FORMAT_GROUP) {
1315                         sz = sample->read.group.nr *
1316                              sizeof(struct sample_read_value);
1317                         memcpy(array, sample->read.group.values, sz);
1318                         array = (void *)array + sz;
1319                 } else {
1320                         *array = sample->read.one.id;
1321                         array++;
1322                 }
1323         }
1324
1325         if (type & PERF_SAMPLE_CALLCHAIN) {
1326                 sz = (sample->callchain->nr + 1) * sizeof(u64);
1327                 memcpy(array, sample->callchain, sz);
1328                 array = (void *)array + sz;
1329         }
1330
1331         if (type & PERF_SAMPLE_RAW) {
1332                 u.val32[0] = sample->raw_size;
1333                 *array = u.val64;
1334                 array = (void *)array + sizeof(u32);
1335
1336                 memcpy(array, sample->raw_data, sample->raw_size);
1337                 array = (void *)array + sample->raw_size;
1338         }
1339
1340         if (type & PERF_SAMPLE_BRANCH_STACK) {
1341                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1342                 sz += sizeof(u64);
1343                 memcpy(array, sample->branch_stack, sz);
1344                 array = (void *)array + sz;
1345         }
1346
1347         if (type & PERF_SAMPLE_REGS_USER) {
1348                 if (sample->user_regs.abi) {
1349                         *array++ = sample->user_regs.abi;
1350                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
1351                         memcpy(array, sample->user_regs.regs, sz);
1352                         array = (void *)array + sz;
1353                 } else {
1354                         *array++ = 0;
1355                 }
1356         }
1357
1358         if (type & PERF_SAMPLE_STACK_USER) {
1359                 sz = sample->user_stack.size;
1360                 *array++ = sz;
1361                 if (sz) {
1362                         memcpy(array, sample->user_stack.data, sz);
1363                         array = (void *)array + sz;
1364                         *array++ = sz;
1365                 }
1366         }
1367
1368         if (type & PERF_SAMPLE_WEIGHT) {
1369                 *array = sample->weight;
1370                 array++;
1371         }
1372
1373         if (type & PERF_SAMPLE_DATA_SRC) {
1374                 *array = sample->data_src;
1375                 array++;
1376         }
1377
1378         if (type & PERF_SAMPLE_TRANSACTION) {
1379                 *array = sample->transaction;
1380                 array++;
1381         }
1382
1383         if (type & PERF_SAMPLE_REGS_INTR) {
1384                 if (sample->intr_regs.abi) {
1385                         *array++ = sample->intr_regs.abi;
1386                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
1387                         memcpy(array, sample->intr_regs.regs, sz);
1388                         array = (void *)array + sz;
1389                 } else {
1390                         *array++ = 0;
1391                 }
1392         }
1393
1394         if (type & PERF_SAMPLE_PHYS_ADDR) {
1395                 *array = sample->phys_addr;
1396                 array++;
1397         }
1398
1399         return 0;
1400 }
1401
1402 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process,
1403                                     struct evlist *evlist, struct machine *machine)
1404 {
1405         union perf_event *ev;
1406         struct evsel *evsel;
1407         size_t nr = 0, i = 0, sz, max_nr, n;
1408         int err;
1409
1410         pr_debug2("Synthesizing id index\n");
1411
1412         max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) /
1413                  sizeof(struct id_index_entry);
1414
1415         evlist__for_each_entry(evlist, evsel)
1416                 nr += evsel->core.ids;
1417
1418         n = nr > max_nr ? max_nr : nr;
1419         sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry);
1420         ev = zalloc(sz);
1421         if (!ev)
1422                 return -ENOMEM;
1423
1424         ev->id_index.header.type = PERF_RECORD_ID_INDEX;
1425         ev->id_index.header.size = sz;
1426         ev->id_index.nr = n;
1427
1428         evlist__for_each_entry(evlist, evsel) {
1429                 u32 j;
1430
1431                 for (j = 0; j < evsel->core.ids; j++) {
1432                         struct id_index_entry *e;
1433                         struct perf_sample_id *sid;
1434
1435                         if (i >= n) {
1436                                 err = process(tool, ev, NULL, machine);
1437                                 if (err)
1438                                         goto out_err;
1439                                 nr -= n;
1440                                 i = 0;
1441                         }
1442
1443                         e = &ev->id_index.entries[i++];
1444
1445                         e->id = evsel->core.id[j];
1446
1447                         sid = perf_evlist__id2sid(evlist, e->id);
1448                         if (!sid) {
1449                                 free(ev);
1450                                 return -ENOENT;
1451                         }
1452
1453                         e->idx = sid->idx;
1454                         e->cpu = sid->cpu;
1455                         e->tid = sid->tid;
1456                 }
1457         }
1458
1459         sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry);
1460         ev->id_index.header.size = sz;
1461         ev->id_index.nr = nr;
1462
1463         err = process(tool, ev, NULL, machine);
1464 out_err:
1465         free(ev);
1466
1467         return err;
1468 }
1469
1470 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1471                                   struct target *target, struct perf_thread_map *threads,
1472                                   perf_event__handler_t process, bool data_mmap,
1473                                   unsigned int nr_threads_synthesize)
1474 {
1475         if (target__has_task(target))
1476                 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1477         else if (target__has_cpu(target))
1478                 return perf_event__synthesize_threads(tool, process,
1479                                                       machine, data_mmap,
1480                                                       nr_threads_synthesize);
1481         /* command specified */
1482         return 0;
1483 }
1484
1485 int machine__synthesize_threads(struct machine *machine, struct target *target,
1486                                 struct perf_thread_map *threads, bool data_mmap,
1487                                 unsigned int nr_threads_synthesize)
1488 {
1489         return __machine__synthesize_threads(machine, NULL, target, threads,
1490                                              perf_event__process, data_mmap,
1491                                              nr_threads_synthesize);
1492 }
1493
1494 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id)
1495 {
1496         struct perf_record_event_update *ev;
1497
1498         size += sizeof(*ev);
1499         size  = PERF_ALIGN(size, sizeof(u64));
1500
1501         ev = zalloc(size);
1502         if (ev) {
1503                 ev->header.type = PERF_RECORD_EVENT_UPDATE;
1504                 ev->header.size = (u16)size;
1505                 ev->type        = type;
1506                 ev->id          = id;
1507         }
1508         return ev;
1509 }
1510
1511 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel,
1512                                              perf_event__handler_t process)
1513 {
1514         size_t size = strlen(evsel->unit);
1515         struct perf_record_event_update *ev;
1516         int err;
1517
1518         ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]);
1519         if (ev == NULL)
1520                 return -ENOMEM;
1521
1522         strlcpy(ev->data, evsel->unit, size + 1);
1523         err = process(tool, (union perf_event *)ev, NULL, NULL);
1524         free(ev);
1525         return err;
1526 }
1527
1528 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel,
1529                                               perf_event__handler_t process)
1530 {
1531         struct perf_record_event_update *ev;
1532         struct perf_record_event_update_scale *ev_data;
1533         int err;
1534
1535         ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]);
1536         if (ev == NULL)
1537                 return -ENOMEM;
1538
1539         ev_data = (struct perf_record_event_update_scale *)ev->data;
1540         ev_data->scale = evsel->scale;
1541         err = process(tool, (union perf_event *)ev, NULL, NULL);
1542         free(ev);
1543         return err;
1544 }
1545
1546 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel,
1547                                              perf_event__handler_t process)
1548 {
1549         struct perf_record_event_update *ev;
1550         size_t len = strlen(evsel->name);
1551         int err;
1552
1553         ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]);
1554         if (ev == NULL)
1555                 return -ENOMEM;
1556
1557         strlcpy(ev->data, evsel->name, len + 1);
1558         err = process(tool, (union perf_event *)ev, NULL, NULL);
1559         free(ev);
1560         return err;
1561 }
1562
1563 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel,
1564                                              perf_event__handler_t process)
1565 {
1566         size_t size = sizeof(struct perf_record_event_update);
1567         struct perf_record_event_update *ev;
1568         int max, err;
1569         u16 type;
1570
1571         if (!evsel->core.own_cpus)
1572                 return 0;
1573
1574         ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max);
1575         if (!ev)
1576                 return -ENOMEM;
1577
1578         ev->header.type = PERF_RECORD_EVENT_UPDATE;
1579         ev->header.size = (u16)size;
1580         ev->type        = PERF_EVENT_UPDATE__CPUS;
1581         ev->id          = evsel->core.id[0];
1582
1583         cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data,
1584                                  evsel->core.own_cpus, type, max);
1585
1586         err = process(tool, (union perf_event *)ev, NULL, NULL);
1587         free(ev);
1588         return err;
1589 }
1590
1591 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist,
1592                                  perf_event__handler_t process)
1593 {
1594         struct evsel *evsel;
1595         int err = 0;
1596
1597         evlist__for_each_entry(evlist, evsel) {
1598                 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids,
1599                                                   evsel->core.id, process);
1600                 if (err) {
1601                         pr_debug("failed to create perf header attribute\n");
1602                         return err;
1603                 }
1604         }
1605
1606         return err;
1607 }
1608
1609 static bool has_unit(struct evsel *evsel)
1610 {
1611         return evsel->unit && *evsel->unit;
1612 }
1613
1614 static bool has_scale(struct evsel *evsel)
1615 {
1616         return evsel->scale != 1;
1617 }
1618
1619 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list,
1620                                       perf_event__handler_t process, bool is_pipe)
1621 {
1622         struct evsel *evsel;
1623         int err;
1624
1625         /*
1626          * Synthesize other events stuff not carried within
1627          * attr event - unit, scale, name
1628          */
1629         evlist__for_each_entry(evsel_list, evsel) {
1630                 if (!evsel->supported)
1631                         continue;
1632
1633                 /*
1634                  * Synthesize unit and scale only if it's defined.
1635                  */
1636                 if (has_unit(evsel)) {
1637                         err = perf_event__synthesize_event_update_unit(tool, evsel, process);
1638                         if (err < 0) {
1639                                 pr_err("Couldn't synthesize evsel unit.\n");
1640                                 return err;
1641                         }
1642                 }
1643
1644                 if (has_scale(evsel)) {
1645                         err = perf_event__synthesize_event_update_scale(tool, evsel, process);
1646                         if (err < 0) {
1647                                 pr_err("Couldn't synthesize evsel evsel.\n");
1648                                 return err;
1649                         }
1650                 }
1651
1652                 if (evsel->core.own_cpus) {
1653                         err = perf_event__synthesize_event_update_cpus(tool, evsel, process);
1654                         if (err < 0) {
1655                                 pr_err("Couldn't synthesize evsel cpus.\n");
1656                                 return err;
1657                         }
1658                 }
1659
1660                 /*
1661                  * Name is needed only for pipe output,
1662                  * perf.data carries event names.
1663                  */
1664                 if (is_pipe) {
1665                         err = perf_event__synthesize_event_update_name(tool, evsel, process);
1666                         if (err < 0) {
1667                                 pr_err("Couldn't synthesize evsel name.\n");
1668                                 return err;
1669                         }
1670                 }
1671         }
1672         return 0;
1673 }
1674
1675 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr,
1676                                 u32 ids, u64 *id, perf_event__handler_t process)
1677 {
1678         union perf_event *ev;
1679         size_t size;
1680         int err;
1681
1682         size = sizeof(struct perf_event_attr);
1683         size = PERF_ALIGN(size, sizeof(u64));
1684         size += sizeof(struct perf_event_header);
1685         size += ids * sizeof(u64);
1686
1687         ev = zalloc(size);
1688
1689         if (ev == NULL)
1690                 return -ENOMEM;
1691
1692         ev->attr.attr = *attr;
1693         memcpy(ev->attr.id, id, ids * sizeof(u64));
1694
1695         ev->attr.header.type = PERF_RECORD_HEADER_ATTR;
1696         ev->attr.header.size = (u16)size;
1697
1698         if (ev->attr.header.size == size)
1699                 err = process(tool, ev, NULL, NULL);
1700         else
1701                 err = -E2BIG;
1702
1703         free(ev);
1704
1705         return err;
1706 }
1707
1708 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist,
1709                                         perf_event__handler_t process)
1710 {
1711         union perf_event ev;
1712         struct tracing_data *tdata;
1713         ssize_t size = 0, aligned_size = 0, padding;
1714         struct feat_fd ff;
1715
1716         /*
1717          * We are going to store the size of the data followed
1718          * by the data contents. Since the fd descriptor is a pipe,
1719          * we cannot seek back to store the size of the data once
1720          * we know it. Instead we:
1721          *
1722          * - write the tracing data to the temp file
1723          * - get/write the data size to pipe
1724          * - write the tracing data from the temp file
1725          *   to the pipe
1726          */
1727         tdata = tracing_data_get(&evlist->core.entries, fd, true);
1728         if (!tdata)
1729                 return -1;
1730
1731         memset(&ev, 0, sizeof(ev));
1732
1733         ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA;
1734         size = tdata->size;
1735         aligned_size = PERF_ALIGN(size, sizeof(u64));
1736         padding = aligned_size - size;
1737         ev.tracing_data.header.size = sizeof(ev.tracing_data);
1738         ev.tracing_data.size = aligned_size;
1739
1740         process(tool, &ev, NULL, NULL);
1741
1742         /*
1743          * The put function will copy all the tracing data
1744          * stored in temp file to the pipe.
1745          */
1746         tracing_data_put(tdata);
1747
1748         ff = (struct feat_fd){ .fd = fd };
1749         if (write_padded(&ff, NULL, 0, padding))
1750                 return -1;
1751
1752         return aligned_size;
1753 }
1754
1755 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc,
1756                                     perf_event__handler_t process, struct machine *machine)
1757 {
1758         union perf_event ev;
1759         size_t len;
1760
1761         if (!pos->hit)
1762                 return 0;
1763
1764         memset(&ev, 0, sizeof(ev));
1765
1766         len = pos->long_name_len + 1;
1767         len = PERF_ALIGN(len, NAME_ALIGN);
1768         memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id));
1769         ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID;
1770         ev.build_id.header.misc = misc;
1771         ev.build_id.pid = machine->pid;
1772         ev.build_id.header.size = sizeof(ev.build_id) + len;
1773         memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len);
1774
1775         return process(tool, &ev, NULL, machine);
1776 }
1777
1778 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool,
1779                                        struct evlist *evlist, perf_event__handler_t process, bool attrs)
1780 {
1781         int err;
1782
1783         if (attrs) {
1784                 err = perf_event__synthesize_attrs(tool, evlist, process);
1785                 if (err < 0) {
1786                         pr_err("Couldn't synthesize attrs.\n");
1787                         return err;
1788                 }
1789         }
1790
1791         err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs);
1792         err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL);
1793         if (err < 0) {
1794                 pr_err("Couldn't synthesize thread map.\n");
1795                 return err;
1796         }
1797
1798         err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL);
1799         if (err < 0) {
1800                 pr_err("Couldn't synthesize thread map.\n");
1801                 return err;
1802         }
1803
1804         err = perf_event__synthesize_stat_config(tool, config, process, NULL);
1805         if (err < 0) {
1806                 pr_err("Couldn't synthesize config.\n");
1807                 return err;
1808         }
1809
1810         return 0;
1811 }
1812
1813 int __weak perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused,
1814                                        struct perf_tool *tool __maybe_unused,
1815                                        perf_event__handler_t process __maybe_unused,
1816                                        struct machine *machine __maybe_unused)
1817 {
1818         return 0;
1819 }
1820
1821 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE];
1822
1823 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session,
1824                                     struct evlist *evlist, perf_event__handler_t process)
1825 {
1826         struct perf_header *header = &session->header;
1827         struct perf_record_header_feature *fe;
1828         struct feat_fd ff;
1829         size_t sz, sz_hdr;
1830         int feat, ret;
1831
1832         sz_hdr = sizeof(fe->header);
1833         sz = sizeof(union perf_event);
1834         /* get a nice alignment */
1835         sz = PERF_ALIGN(sz, page_size);
1836
1837         memset(&ff, 0, sizeof(ff));
1838
1839         ff.buf = malloc(sz);
1840         if (!ff.buf)
1841                 return -ENOMEM;
1842
1843         ff.size = sz - sz_hdr;
1844         ff.ph = &session->header;
1845
1846         for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
1847                 if (!feat_ops[feat].synthesize) {
1848                         pr_debug("No record header feature for header :%d\n", feat);
1849                         continue;
1850                 }
1851
1852                 ff.offset = sizeof(*fe);
1853
1854                 ret = feat_ops[feat].write(&ff, evlist);
1855                 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) {
1856                         pr_debug("Error writing feature\n");
1857                         continue;
1858                 }
1859                 /* ff.buf may have changed due to realloc in do_write() */
1860                 fe = ff.buf;
1861                 memset(fe, 0, sizeof(*fe));
1862
1863                 fe->feat_id = feat;
1864                 fe->header.type = PERF_RECORD_HEADER_FEATURE;
1865                 fe->header.size = ff.offset;
1866
1867                 ret = process(tool, ff.buf, NULL, NULL);
1868                 if (ret) {
1869                         free(ff.buf);
1870                         return ret;
1871                 }
1872         }
1873
1874         /* Send HEADER_LAST_FEATURE mark. */
1875         fe = ff.buf;
1876         fe->feat_id     = HEADER_LAST_FEATURE;
1877         fe->header.type = PERF_RECORD_HEADER_FEATURE;
1878         fe->header.size = sizeof(*fe);
1879
1880         ret = process(tool, ff.buf, NULL, NULL);
1881
1882         free(ff.buf);
1883         return ret;
1884 }