1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "util/debug.h" 4 #include "util/dso.h" 5 #include "util/event.h" 6 #include "util/evlist.h" 7 #include "util/machine.h" 8 #include "util/map.h" 9 #include "util/map_symbol.h" 10 #include "util/branch.h" 11 #include "util/memswap.h" 12 #include "util/namespaces.h" 13 #include "util/session.h" 14 #include "util/stat.h" 15 #include "util/symbol.h" 16 #include "util/synthetic-events.h" 17 #include "util/target.h" 18 #include "util/time-utils.h" 19 #include "util/cgroup.h" 20 #include <linux/bitops.h> 21 #include <linux/kernel.h> 22 #include <linux/string.h> 23 #include <linux/zalloc.h> 24 #include <linux/perf_event.h> 25 #include <asm/bug.h> 26 #include <perf/evsel.h> 27 #include <internal/cpumap.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 <sys/types.h> 41 #include <sys/stat.h> 42 #include <fcntl.h> 43 #include <unistd.h> 44 45 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500 46 47 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT; 48 49 int perf_tool__process_synth_event(struct perf_tool *tool, 50 union perf_event *event, 51 struct machine *machine, 52 perf_event__handler_t process) 53 { 54 struct perf_sample synth_sample = { 55 .pid = -1, 56 .tid = -1, 57 .time = -1, 58 .stream_id = -1, 59 .cpu = -1, 60 .period = 1, 61 .cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK, 62 }; 63 64 return process(tool, event, &synth_sample, machine); 65 }; 66 67 /* 68 * Assumes that the first 4095 bytes of /proc/pid/stat contains 69 * the comm, tgid and ppid. 70 */ 71 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len, 72 pid_t *tgid, pid_t *ppid) 73 { 74 char filename[PATH_MAX]; 75 char bf[4096]; 76 int fd; 77 size_t size = 0; 78 ssize_t n; 79 char *name, *tgids, *ppids; 80 81 *tgid = -1; 82 *ppid = -1; 83 84 snprintf(filename, sizeof(filename), "/proc/%d/status", pid); 85 86 fd = open(filename, O_RDONLY); 87 if (fd < 0) { 88 pr_debug("couldn't open %s\n", filename); 89 return -1; 90 } 91 92 n = read(fd, bf, sizeof(bf) - 1); 93 close(fd); 94 if (n <= 0) { 95 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n", 96 pid); 97 return -1; 98 } 99 bf[n] = '\0'; 100 101 name = strstr(bf, "Name:"); 102 tgids = strstr(bf, "Tgid:"); 103 ppids = strstr(bf, "PPid:"); 104 105 if (name) { 106 char *nl; 107 108 name = skip_spaces(name + 5); /* strlen("Name:") */ 109 nl = strchr(name, '\n'); 110 if (nl) 111 *nl = '\0'; 112 113 size = strlen(name); 114 if (size >= len) 115 size = len - 1; 116 memcpy(comm, name, size); 117 comm[size] = '\0'; 118 } else { 119 pr_debug("Name: string not found for pid %d\n", pid); 120 } 121 122 if (tgids) { 123 tgids += 5; /* strlen("Tgid:") */ 124 *tgid = atoi(tgids); 125 } else { 126 pr_debug("Tgid: string not found for pid %d\n", pid); 127 } 128 129 if (ppids) { 130 ppids += 5; /* strlen("PPid:") */ 131 *ppid = atoi(ppids); 132 } else { 133 pr_debug("PPid: string not found for pid %d\n", pid); 134 } 135 136 return 0; 137 } 138 139 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, 140 struct machine *machine, 141 pid_t *tgid, pid_t *ppid) 142 { 143 size_t size; 144 145 *ppid = -1; 146 147 memset(&event->comm, 0, sizeof(event->comm)); 148 149 if (machine__is_host(machine)) { 150 if (perf_event__get_comm_ids(pid, event->comm.comm, 151 sizeof(event->comm.comm), 152 tgid, ppid) != 0) { 153 return -1; 154 } 155 } else { 156 *tgid = machine->pid; 157 } 158 159 if (*tgid < 0) 160 return -1; 161 162 event->comm.pid = *tgid; 163 event->comm.header.type = PERF_RECORD_COMM; 164 165 size = strlen(event->comm.comm) + 1; 166 size = PERF_ALIGN(size, sizeof(u64)); 167 memset(event->comm.comm + size, 0, machine->id_hdr_size); 168 event->comm.header.size = (sizeof(event->comm) - 169 (sizeof(event->comm.comm) - size) + 170 machine->id_hdr_size); 171 event->comm.tid = pid; 172 173 return 0; 174 } 175 176 pid_t perf_event__synthesize_comm(struct perf_tool *tool, 177 union perf_event *event, pid_t pid, 178 perf_event__handler_t process, 179 struct machine *machine) 180 { 181 pid_t tgid, ppid; 182 183 if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0) 184 return -1; 185 186 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 187 return -1; 188 189 return tgid; 190 } 191 192 static void perf_event__get_ns_link_info(pid_t pid, const char *ns, 193 struct perf_ns_link_info *ns_link_info) 194 { 195 struct stat64 st; 196 char proc_ns[128]; 197 198 sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns); 199 if (stat64(proc_ns, &st) == 0) { 200 ns_link_info->dev = st.st_dev; 201 ns_link_info->ino = st.st_ino; 202 } 203 } 204 205 int perf_event__synthesize_namespaces(struct perf_tool *tool, 206 union perf_event *event, 207 pid_t pid, pid_t tgid, 208 perf_event__handler_t process, 209 struct machine *machine) 210 { 211 u32 idx; 212 struct perf_ns_link_info *ns_link_info; 213 214 if (!tool || !tool->namespace_events) 215 return 0; 216 217 memset(&event->namespaces, 0, (sizeof(event->namespaces) + 218 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 219 machine->id_hdr_size)); 220 221 event->namespaces.pid = tgid; 222 event->namespaces.tid = pid; 223 224 event->namespaces.nr_namespaces = NR_NAMESPACES; 225 226 ns_link_info = event->namespaces.link_info; 227 228 for (idx = 0; idx < event->namespaces.nr_namespaces; idx++) 229 perf_event__get_ns_link_info(pid, perf_ns__name(idx), 230 &ns_link_info[idx]); 231 232 event->namespaces.header.type = PERF_RECORD_NAMESPACES; 233 234 event->namespaces.header.size = (sizeof(event->namespaces) + 235 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 236 machine->id_hdr_size); 237 238 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 239 return -1; 240 241 return 0; 242 } 243 244 static int perf_event__synthesize_fork(struct perf_tool *tool, 245 union perf_event *event, 246 pid_t pid, pid_t tgid, pid_t ppid, 247 perf_event__handler_t process, 248 struct machine *machine) 249 { 250 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size); 251 252 /* 253 * for main thread set parent to ppid from status file. For other 254 * threads set parent pid to main thread. ie., assume main thread 255 * spawns all threads in a process 256 */ 257 if (tgid == pid) { 258 event->fork.ppid = ppid; 259 event->fork.ptid = ppid; 260 } else { 261 event->fork.ppid = tgid; 262 event->fork.ptid = tgid; 263 } 264 event->fork.pid = tgid; 265 event->fork.tid = pid; 266 event->fork.header.type = PERF_RECORD_FORK; 267 event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC; 268 269 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size); 270 271 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 272 return -1; 273 274 return 0; 275 } 276 277 int perf_event__synthesize_mmap_events(struct perf_tool *tool, 278 union perf_event *event, 279 pid_t pid, pid_t tgid, 280 perf_event__handler_t process, 281 struct machine *machine, 282 bool mmap_data) 283 { 284 char filename[PATH_MAX]; 285 FILE *fp; 286 unsigned long long t; 287 bool truncation = false; 288 unsigned long long timeout = proc_map_timeout * 1000000ULL; 289 int rc = 0; 290 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 291 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 292 293 if (machine__is_default_guest(machine)) 294 return 0; 295 296 snprintf(filename, sizeof(filename), "%s/proc/%d/task/%d/maps", 297 machine->root_dir, pid, pid); 298 299 fp = fopen(filename, "r"); 300 if (fp == NULL) { 301 /* 302 * We raced with a task exiting - just return: 303 */ 304 pr_debug("couldn't open %s\n", filename); 305 return -1; 306 } 307 308 event->header.type = PERF_RECORD_MMAP2; 309 t = rdclock(); 310 311 while (1) { 312 char bf[BUFSIZ]; 313 char prot[5]; 314 char execname[PATH_MAX]; 315 char anonstr[] = "//anon"; 316 unsigned int ino; 317 size_t size; 318 ssize_t n; 319 320 if (fgets(bf, sizeof(bf), fp) == NULL) 321 break; 322 323 if ((rdclock() - t) > timeout) { 324 pr_warning("Reading %s time out. " 325 "You may want to increase " 326 "the time limit by --proc-map-timeout\n", 327 filename); 328 truncation = true; 329 goto out; 330 } 331 332 /* ensure null termination since stack will be reused. */ 333 strcpy(execname, ""); 334 335 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 336 n = sscanf(bf, "%"PRI_lx64"-%"PRI_lx64" %s %"PRI_lx64" %x:%x %u %[^\n]\n", 337 &event->mmap2.start, &event->mmap2.len, prot, 338 &event->mmap2.pgoff, &event->mmap2.maj, 339 &event->mmap2.min, 340 &ino, execname); 341 342 /* 343 * Anon maps don't have the execname. 344 */ 345 if (n < 7) 346 continue; 347 348 event->mmap2.ino = (u64)ino; 349 event->mmap2.ino_generation = 0; 350 351 /* 352 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 353 */ 354 if (machine__is_host(machine)) 355 event->header.misc = PERF_RECORD_MISC_USER; 356 else 357 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 358 359 /* map protection and flags bits */ 360 event->mmap2.prot = 0; 361 event->mmap2.flags = 0; 362 if (prot[0] == 'r') 363 event->mmap2.prot |= PROT_READ; 364 if (prot[1] == 'w') 365 event->mmap2.prot |= PROT_WRITE; 366 if (prot[2] == 'x') 367 event->mmap2.prot |= PROT_EXEC; 368 369 if (prot[3] == 's') 370 event->mmap2.flags |= MAP_SHARED; 371 else 372 event->mmap2.flags |= MAP_PRIVATE; 373 374 if (prot[2] != 'x') { 375 if (!mmap_data || prot[0] != 'r') 376 continue; 377 378 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 379 } 380 381 out: 382 if (truncation) 383 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 384 385 if (!strcmp(execname, "")) 386 strcpy(execname, anonstr); 387 388 if (hugetlbfs_mnt_len && 389 !strncmp(execname, hugetlbfs_mnt, hugetlbfs_mnt_len)) { 390 strcpy(execname, anonstr); 391 event->mmap2.flags |= MAP_HUGETLB; 392 } 393 394 size = strlen(execname) + 1; 395 memcpy(event->mmap2.filename, execname, size); 396 size = PERF_ALIGN(size, sizeof(u64)); 397 event->mmap2.len -= event->mmap.start; 398 event->mmap2.header.size = (sizeof(event->mmap2) - 399 (sizeof(event->mmap2.filename) - size)); 400 memset(event->mmap2.filename + size, 0, machine->id_hdr_size); 401 event->mmap2.header.size += machine->id_hdr_size; 402 event->mmap2.pid = tgid; 403 event->mmap2.tid = pid; 404 405 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 406 rc = -1; 407 break; 408 } 409 410 if (truncation) 411 break; 412 } 413 414 fclose(fp); 415 return rc; 416 } 417 418 #ifdef HAVE_FILE_HANDLE 419 static int perf_event__synthesize_cgroup(struct perf_tool *tool, 420 union perf_event *event, 421 char *path, size_t mount_len, 422 perf_event__handler_t process, 423 struct machine *machine) 424 { 425 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 426 size_t path_len = strlen(path) - mount_len + 1; 427 struct { 428 struct file_handle fh; 429 uint64_t cgroup_id; 430 } handle; 431 int mount_id; 432 433 while (path_len % sizeof(u64)) 434 path[mount_len + path_len++] = '\0'; 435 436 memset(&event->cgroup, 0, event_size); 437 438 event->cgroup.header.type = PERF_RECORD_CGROUP; 439 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 440 441 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 442 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 443 pr_debug("stat failed: %s\n", path); 444 return -1; 445 } 446 447 event->cgroup.id = handle.cgroup_id; 448 strncpy(event->cgroup.path, path + mount_len, path_len); 449 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 450 451 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 452 pr_debug("process synth event failed\n"); 453 return -1; 454 } 455 456 return 0; 457 } 458 459 static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 460 union perf_event *event, 461 char *path, size_t mount_len, 462 perf_event__handler_t process, 463 struct machine *machine) 464 { 465 size_t pos = strlen(path); 466 DIR *d; 467 struct dirent *dent; 468 int ret = 0; 469 470 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 471 process, machine) < 0) 472 return -1; 473 474 d = opendir(path); 475 if (d == NULL) { 476 pr_debug("failed to open directory: %s\n", path); 477 return -1; 478 } 479 480 while ((dent = readdir(d)) != NULL) { 481 if (dent->d_type != DT_DIR) 482 continue; 483 if (!strcmp(dent->d_name, ".") || 484 !strcmp(dent->d_name, "..")) 485 continue; 486 487 /* any sane path should be less than PATH_MAX */ 488 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 489 continue; 490 491 if (path[pos - 1] != '/') 492 strcat(path, "/"); 493 strcat(path, dent->d_name); 494 495 ret = perf_event__walk_cgroup_tree(tool, event, path, 496 mount_len, process, machine); 497 if (ret < 0) 498 break; 499 500 path[pos] = '\0'; 501 } 502 503 closedir(d); 504 return ret; 505 } 506 507 int perf_event__synthesize_cgroups(struct perf_tool *tool, 508 perf_event__handler_t process, 509 struct machine *machine) 510 { 511 union perf_event event; 512 char cgrp_root[PATH_MAX]; 513 size_t mount_len; /* length of mount point in the path */ 514 515 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 516 pr_debug("cannot find cgroup mount point\n"); 517 return -1; 518 } 519 520 mount_len = strlen(cgrp_root); 521 /* make sure the path starts with a slash (after mount point) */ 522 strcat(cgrp_root, "/"); 523 524 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 525 process, machine) < 0) 526 return -1; 527 528 return 0; 529 } 530 #else 531 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 532 perf_event__handler_t process __maybe_unused, 533 struct machine *machine __maybe_unused) 534 { 535 return -1; 536 } 537 #endif 538 539 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 540 struct machine *machine) 541 { 542 int rc = 0; 543 struct map *pos; 544 struct maps *maps = machine__kernel_maps(machine); 545 union perf_event *event = zalloc((sizeof(event->mmap) + 546 machine->id_hdr_size)); 547 if (event == NULL) { 548 pr_debug("Not enough memory synthesizing mmap event " 549 "for kernel modules\n"); 550 return -1; 551 } 552 553 event->header.type = PERF_RECORD_MMAP; 554 555 /* 556 * kernel uses 0 for user space maps, see kernel/perf_event.c 557 * __perf_event_mmap 558 */ 559 if (machine__is_host(machine)) 560 event->header.misc = PERF_RECORD_MISC_KERNEL; 561 else 562 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 563 564 maps__for_each_entry(maps, pos) { 565 size_t size; 566 567 if (!__map__is_kmodule(pos)) 568 continue; 569 570 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 571 event->mmap.header.type = PERF_RECORD_MMAP; 572 event->mmap.header.size = (sizeof(event->mmap) - 573 (sizeof(event->mmap.filename) - size)); 574 memset(event->mmap.filename + size, 0, machine->id_hdr_size); 575 event->mmap.header.size += machine->id_hdr_size; 576 event->mmap.start = pos->start; 577 event->mmap.len = pos->end - pos->start; 578 event->mmap.pid = machine->pid; 579 580 memcpy(event->mmap.filename, pos->dso->long_name, 581 pos->dso->long_name_len + 1); 582 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 583 rc = -1; 584 break; 585 } 586 } 587 588 free(event); 589 return rc; 590 } 591 592 static int __event__synthesize_thread(union perf_event *comm_event, 593 union perf_event *mmap_event, 594 union perf_event *fork_event, 595 union perf_event *namespaces_event, 596 pid_t pid, int full, perf_event__handler_t process, 597 struct perf_tool *tool, struct machine *machine, bool mmap_data) 598 { 599 char filename[PATH_MAX]; 600 DIR *tasks; 601 struct dirent *dirent; 602 pid_t tgid, ppid; 603 int rc = 0; 604 605 /* special case: only send one comm event using passed in pid */ 606 if (!full) { 607 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 608 process, machine); 609 610 if (tgid == -1) 611 return -1; 612 613 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 614 tgid, process, machine) < 0) 615 return -1; 616 617 /* 618 * send mmap only for thread group leader 619 * see thread__init_maps() 620 */ 621 if (pid == tgid && 622 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 623 process, machine, mmap_data)) 624 return -1; 625 626 return 0; 627 } 628 629 if (machine__is_default_guest(machine)) 630 return 0; 631 632 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 633 machine->root_dir, pid); 634 635 tasks = opendir(filename); 636 if (tasks == NULL) { 637 pr_debug("couldn't open %s\n", filename); 638 return 0; 639 } 640 641 while ((dirent = readdir(tasks)) != NULL) { 642 char *end; 643 pid_t _pid; 644 645 _pid = strtol(dirent->d_name, &end, 10); 646 if (*end) 647 continue; 648 649 rc = -1; 650 if (perf_event__prepare_comm(comm_event, _pid, machine, 651 &tgid, &ppid) != 0) 652 break; 653 654 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 655 ppid, process, machine) < 0) 656 break; 657 658 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 659 tgid, process, machine) < 0) 660 break; 661 662 /* 663 * Send the prepared comm event 664 */ 665 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 666 break; 667 668 rc = 0; 669 if (_pid == pid) { 670 /* process the parent's maps too */ 671 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 672 process, machine, mmap_data); 673 if (rc) 674 break; 675 } 676 } 677 678 closedir(tasks); 679 return rc; 680 } 681 682 int perf_event__synthesize_thread_map(struct perf_tool *tool, 683 struct perf_thread_map *threads, 684 perf_event__handler_t process, 685 struct machine *machine, 686 bool mmap_data) 687 { 688 union perf_event *comm_event, *mmap_event, *fork_event; 689 union perf_event *namespaces_event; 690 int err = -1, thread, j; 691 692 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 693 if (comm_event == NULL) 694 goto out; 695 696 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 697 if (mmap_event == NULL) 698 goto out_free_comm; 699 700 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 701 if (fork_event == NULL) 702 goto out_free_mmap; 703 704 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 705 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 706 machine->id_hdr_size); 707 if (namespaces_event == NULL) 708 goto out_free_fork; 709 710 err = 0; 711 for (thread = 0; thread < threads->nr; ++thread) { 712 if (__event__synthesize_thread(comm_event, mmap_event, 713 fork_event, namespaces_event, 714 perf_thread_map__pid(threads, thread), 0, 715 process, tool, machine, 716 mmap_data)) { 717 err = -1; 718 break; 719 } 720 721 /* 722 * comm.pid is set to thread group id by 723 * perf_event__synthesize_comm 724 */ 725 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 726 bool need_leader = true; 727 728 /* is thread group leader in thread_map? */ 729 for (j = 0; j < threads->nr; ++j) { 730 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 731 need_leader = false; 732 break; 733 } 734 } 735 736 /* if not, generate events for it */ 737 if (need_leader && 738 __event__synthesize_thread(comm_event, mmap_event, 739 fork_event, namespaces_event, 740 comm_event->comm.pid, 0, 741 process, tool, machine, 742 mmap_data)) { 743 err = -1; 744 break; 745 } 746 } 747 } 748 free(namespaces_event); 749 out_free_fork: 750 free(fork_event); 751 out_free_mmap: 752 free(mmap_event); 753 out_free_comm: 754 free(comm_event); 755 out: 756 return err; 757 } 758 759 static int __perf_event__synthesize_threads(struct perf_tool *tool, 760 perf_event__handler_t process, 761 struct machine *machine, 762 bool mmap_data, 763 struct dirent **dirent, 764 int start, 765 int num) 766 { 767 union perf_event *comm_event, *mmap_event, *fork_event; 768 union perf_event *namespaces_event; 769 int err = -1; 770 char *end; 771 pid_t pid; 772 int i; 773 774 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 775 if (comm_event == NULL) 776 goto out; 777 778 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 779 if (mmap_event == NULL) 780 goto out_free_comm; 781 782 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 783 if (fork_event == NULL) 784 goto out_free_mmap; 785 786 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 787 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 788 machine->id_hdr_size); 789 if (namespaces_event == NULL) 790 goto out_free_fork; 791 792 for (i = start; i < start + num; i++) { 793 if (!isdigit(dirent[i]->d_name[0])) 794 continue; 795 796 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 797 /* only interested in proper numerical dirents */ 798 if (*end) 799 continue; 800 /* 801 * We may race with exiting thread, so don't stop just because 802 * one thread couldn't be synthesized. 803 */ 804 __event__synthesize_thread(comm_event, mmap_event, fork_event, 805 namespaces_event, pid, 1, process, 806 tool, machine, mmap_data); 807 } 808 err = 0; 809 810 free(namespaces_event); 811 out_free_fork: 812 free(fork_event); 813 out_free_mmap: 814 free(mmap_event); 815 out_free_comm: 816 free(comm_event); 817 out: 818 return err; 819 } 820 821 struct synthesize_threads_arg { 822 struct perf_tool *tool; 823 perf_event__handler_t process; 824 struct machine *machine; 825 bool mmap_data; 826 struct dirent **dirent; 827 int num; 828 int start; 829 }; 830 831 static void *synthesize_threads_worker(void *arg) 832 { 833 struct synthesize_threads_arg *args = arg; 834 835 __perf_event__synthesize_threads(args->tool, args->process, 836 args->machine, args->mmap_data, 837 args->dirent, 838 args->start, args->num); 839 return NULL; 840 } 841 842 int perf_event__synthesize_threads(struct perf_tool *tool, 843 perf_event__handler_t process, 844 struct machine *machine, 845 bool mmap_data, 846 unsigned int nr_threads_synthesize) 847 { 848 struct synthesize_threads_arg *args = NULL; 849 pthread_t *synthesize_threads = NULL; 850 char proc_path[PATH_MAX]; 851 struct dirent **dirent; 852 int num_per_thread; 853 int m, n, i, j; 854 int thread_nr; 855 int base = 0; 856 int err = -1; 857 858 859 if (machine__is_default_guest(machine)) 860 return 0; 861 862 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 863 n = scandir(proc_path, &dirent, 0, alphasort); 864 if (n < 0) 865 return err; 866 867 if (nr_threads_synthesize == UINT_MAX) 868 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 869 else 870 thread_nr = nr_threads_synthesize; 871 872 if (thread_nr <= 1) { 873 err = __perf_event__synthesize_threads(tool, process, 874 machine, mmap_data, 875 dirent, base, n); 876 goto free_dirent; 877 } 878 if (thread_nr > n) 879 thread_nr = n; 880 881 synthesize_threads = calloc(sizeof(pthread_t), thread_nr); 882 if (synthesize_threads == NULL) 883 goto free_dirent; 884 885 args = calloc(sizeof(*args), thread_nr); 886 if (args == NULL) 887 goto free_threads; 888 889 num_per_thread = n / thread_nr; 890 m = n % thread_nr; 891 for (i = 0; i < thread_nr; i++) { 892 args[i].tool = tool; 893 args[i].process = process; 894 args[i].machine = machine; 895 args[i].mmap_data = mmap_data; 896 args[i].dirent = dirent; 897 } 898 for (i = 0; i < m; i++) { 899 args[i].num = num_per_thread + 1; 900 args[i].start = i * args[i].num; 901 } 902 if (i != 0) 903 base = args[i-1].start + args[i-1].num; 904 for (j = i; j < thread_nr; j++) { 905 args[j].num = num_per_thread; 906 args[j].start = base + (j - i) * args[i].num; 907 } 908 909 for (i = 0; i < thread_nr; i++) { 910 if (pthread_create(&synthesize_threads[i], NULL, 911 synthesize_threads_worker, &args[i])) 912 goto out_join; 913 } 914 err = 0; 915 out_join: 916 for (i = 0; i < thread_nr; i++) 917 pthread_join(synthesize_threads[i], NULL); 918 free(args); 919 free_threads: 920 free(synthesize_threads); 921 free_dirent: 922 for (i = 0; i < n; i++) 923 zfree(&dirent[i]); 924 free(dirent); 925 926 return err; 927 } 928 929 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 930 perf_event__handler_t process __maybe_unused, 931 struct machine *machine __maybe_unused) 932 { 933 return 0; 934 } 935 936 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 937 perf_event__handler_t process, 938 struct machine *machine) 939 { 940 size_t size; 941 struct map *map = machine__kernel_map(machine); 942 struct kmap *kmap; 943 int err; 944 union perf_event *event; 945 946 if (map == NULL) 947 return -1; 948 949 kmap = map__kmap(map); 950 if (!kmap->ref_reloc_sym) 951 return -1; 952 953 /* 954 * We should get this from /sys/kernel/sections/.text, but till that is 955 * available use this, and after it is use this as a fallback for older 956 * kernels. 957 */ 958 event = zalloc((sizeof(event->mmap) + machine->id_hdr_size)); 959 if (event == NULL) { 960 pr_debug("Not enough memory synthesizing mmap event " 961 "for kernel modules\n"); 962 return -1; 963 } 964 965 if (machine__is_host(machine)) { 966 /* 967 * kernel uses PERF_RECORD_MISC_USER for user space maps, 968 * see kernel/perf_event.c __perf_event_mmap 969 */ 970 event->header.misc = PERF_RECORD_MISC_KERNEL; 971 } else { 972 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 973 } 974 975 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 976 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 977 size = PERF_ALIGN(size, sizeof(u64)); 978 event->mmap.header.type = PERF_RECORD_MMAP; 979 event->mmap.header.size = (sizeof(event->mmap) - 980 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 981 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 982 event->mmap.start = map->start; 983 event->mmap.len = map->end - event->mmap.start; 984 event->mmap.pid = machine->pid; 985 986 err = perf_tool__process_synth_event(tool, event, machine, process); 987 free(event); 988 989 return err; 990 } 991 992 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 993 perf_event__handler_t process, 994 struct machine *machine) 995 { 996 int err; 997 998 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 999 if (err < 0) 1000 return err; 1001 1002 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1003 } 1004 1005 int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1006 struct perf_thread_map *threads, 1007 perf_event__handler_t process, 1008 struct machine *machine) 1009 { 1010 union perf_event *event; 1011 int i, err, size; 1012 1013 size = sizeof(event->thread_map); 1014 size += threads->nr * sizeof(event->thread_map.entries[0]); 1015 1016 event = zalloc(size); 1017 if (!event) 1018 return -ENOMEM; 1019 1020 event->header.type = PERF_RECORD_THREAD_MAP; 1021 event->header.size = size; 1022 event->thread_map.nr = threads->nr; 1023 1024 for (i = 0; i < threads->nr; i++) { 1025 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1026 char *comm = perf_thread_map__comm(threads, i); 1027 1028 if (!comm) 1029 comm = (char *) ""; 1030 1031 entry->pid = perf_thread_map__pid(threads, i); 1032 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1033 } 1034 1035 err = process(tool, event, NULL, machine); 1036 1037 free(event); 1038 return err; 1039 } 1040 1041 static void synthesize_cpus(struct cpu_map_entries *cpus, 1042 struct perf_cpu_map *map) 1043 { 1044 int i; 1045 1046 cpus->nr = map->nr; 1047 1048 for (i = 0; i < map->nr; i++) 1049 cpus->cpu[i] = map->map[i]; 1050 } 1051 1052 static void synthesize_mask(struct perf_record_record_cpu_map *mask, 1053 struct perf_cpu_map *map, int max) 1054 { 1055 int i; 1056 1057 mask->nr = BITS_TO_LONGS(max); 1058 mask->long_size = sizeof(long); 1059 1060 for (i = 0; i < map->nr; i++) 1061 set_bit(map->map[i], mask->mask); 1062 } 1063 1064 static size_t cpus_size(struct perf_cpu_map *map) 1065 { 1066 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16); 1067 } 1068 1069 static size_t mask_size(struct perf_cpu_map *map, int *max) 1070 { 1071 int i; 1072 1073 *max = 0; 1074 1075 for (i = 0; i < map->nr; i++) { 1076 /* bit possition of the cpu is + 1 */ 1077 int bit = map->map[i] + 1; 1078 1079 if (bit > *max) 1080 *max = bit; 1081 } 1082 1083 return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long); 1084 } 1085 1086 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max) 1087 { 1088 size_t size_cpus, size_mask; 1089 bool is_dummy = perf_cpu_map__empty(map); 1090 1091 /* 1092 * Both array and mask data have variable size based 1093 * on the number of cpus and their actual values. 1094 * The size of the 'struct perf_record_cpu_map_data' is: 1095 * 1096 * array = size of 'struct cpu_map_entries' + 1097 * number of cpus * sizeof(u64) 1098 * 1099 * mask = size of 'struct perf_record_record_cpu_map' + 1100 * maximum cpu bit converted to size of longs 1101 * 1102 * and finaly + the size of 'struct perf_record_cpu_map_data'. 1103 */ 1104 size_cpus = cpus_size(map); 1105 size_mask = mask_size(map, max); 1106 1107 if (is_dummy || (size_cpus < size_mask)) { 1108 *size += size_cpus; 1109 *type = PERF_CPU_MAP__CPUS; 1110 } else { 1111 *size += size_mask; 1112 *type = PERF_CPU_MAP__MASK; 1113 } 1114 1115 *size += sizeof(struct perf_record_cpu_map_data); 1116 *size = PERF_ALIGN(*size, sizeof(u64)); 1117 return zalloc(*size); 1118 } 1119 1120 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map, 1121 u16 type, int max) 1122 { 1123 data->type = type; 1124 1125 switch (type) { 1126 case PERF_CPU_MAP__CPUS: 1127 synthesize_cpus((struct cpu_map_entries *) data->data, map); 1128 break; 1129 case PERF_CPU_MAP__MASK: 1130 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max); 1131 default: 1132 break; 1133 }; 1134 } 1135 1136 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map) 1137 { 1138 size_t size = sizeof(struct perf_record_cpu_map); 1139 struct perf_record_cpu_map *event; 1140 int max; 1141 u16 type; 1142 1143 event = cpu_map_data__alloc(map, &size, &type, &max); 1144 if (!event) 1145 return NULL; 1146 1147 event->header.type = PERF_RECORD_CPU_MAP; 1148 event->header.size = size; 1149 event->data.type = type; 1150 1151 cpu_map_data__synthesize(&event->data, map, type, max); 1152 return event; 1153 } 1154 1155 int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1156 struct perf_cpu_map *map, 1157 perf_event__handler_t process, 1158 struct machine *machine) 1159 { 1160 struct perf_record_cpu_map *event; 1161 int err; 1162 1163 event = cpu_map_event__new(map); 1164 if (!event) 1165 return -ENOMEM; 1166 1167 err = process(tool, (union perf_event *) event, NULL, machine); 1168 1169 free(event); 1170 return err; 1171 } 1172 1173 int perf_event__synthesize_stat_config(struct perf_tool *tool, 1174 struct perf_stat_config *config, 1175 perf_event__handler_t process, 1176 struct machine *machine) 1177 { 1178 struct perf_record_stat_config *event; 1179 int size, i = 0, err; 1180 1181 size = sizeof(*event); 1182 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1183 1184 event = zalloc(size); 1185 if (!event) 1186 return -ENOMEM; 1187 1188 event->header.type = PERF_RECORD_STAT_CONFIG; 1189 event->header.size = size; 1190 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1191 1192 #define ADD(__term, __val) \ 1193 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1194 event->data[i].val = __val; \ 1195 i++; 1196 1197 ADD(AGGR_MODE, config->aggr_mode) 1198 ADD(INTERVAL, config->interval) 1199 ADD(SCALE, config->scale) 1200 1201 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1202 "stat config terms unbalanced\n"); 1203 #undef ADD 1204 1205 err = process(tool, (union perf_event *) event, NULL, machine); 1206 1207 free(event); 1208 return err; 1209 } 1210 1211 int perf_event__synthesize_stat(struct perf_tool *tool, 1212 u32 cpu, u32 thread, u64 id, 1213 struct perf_counts_values *count, 1214 perf_event__handler_t process, 1215 struct machine *machine) 1216 { 1217 struct perf_record_stat event; 1218 1219 event.header.type = PERF_RECORD_STAT; 1220 event.header.size = sizeof(event); 1221 event.header.misc = 0; 1222 1223 event.id = id; 1224 event.cpu = cpu; 1225 event.thread = thread; 1226 event.val = count->val; 1227 event.ena = count->ena; 1228 event.run = count->run; 1229 1230 return process(tool, (union perf_event *) &event, NULL, machine); 1231 } 1232 1233 int perf_event__synthesize_stat_round(struct perf_tool *tool, 1234 u64 evtime, u64 type, 1235 perf_event__handler_t process, 1236 struct machine *machine) 1237 { 1238 struct perf_record_stat_round event; 1239 1240 event.header.type = PERF_RECORD_STAT_ROUND; 1241 event.header.size = sizeof(event); 1242 event.header.misc = 0; 1243 1244 event.time = evtime; 1245 event.type = type; 1246 1247 return process(tool, (union perf_event *) &event, NULL, machine); 1248 } 1249 1250 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1251 { 1252 size_t sz, result = sizeof(struct perf_record_sample); 1253 1254 if (type & PERF_SAMPLE_IDENTIFIER) 1255 result += sizeof(u64); 1256 1257 if (type & PERF_SAMPLE_IP) 1258 result += sizeof(u64); 1259 1260 if (type & PERF_SAMPLE_TID) 1261 result += sizeof(u64); 1262 1263 if (type & PERF_SAMPLE_TIME) 1264 result += sizeof(u64); 1265 1266 if (type & PERF_SAMPLE_ADDR) 1267 result += sizeof(u64); 1268 1269 if (type & PERF_SAMPLE_ID) 1270 result += sizeof(u64); 1271 1272 if (type & PERF_SAMPLE_STREAM_ID) 1273 result += sizeof(u64); 1274 1275 if (type & PERF_SAMPLE_CPU) 1276 result += sizeof(u64); 1277 1278 if (type & PERF_SAMPLE_PERIOD) 1279 result += sizeof(u64); 1280 1281 if (type & PERF_SAMPLE_READ) { 1282 result += sizeof(u64); 1283 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1284 result += sizeof(u64); 1285 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1286 result += sizeof(u64); 1287 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1288 if (read_format & PERF_FORMAT_GROUP) { 1289 sz = sample->read.group.nr * 1290 sizeof(struct sample_read_value); 1291 result += sz; 1292 } else { 1293 result += sizeof(u64); 1294 } 1295 } 1296 1297 if (type & PERF_SAMPLE_CALLCHAIN) { 1298 sz = (sample->callchain->nr + 1) * sizeof(u64); 1299 result += sz; 1300 } 1301 1302 if (type & PERF_SAMPLE_RAW) { 1303 result += sizeof(u32); 1304 result += sample->raw_size; 1305 } 1306 1307 if (type & PERF_SAMPLE_BRANCH_STACK) { 1308 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1309 /* nr, hw_idx */ 1310 sz += 2 * sizeof(u64); 1311 result += sz; 1312 } 1313 1314 if (type & PERF_SAMPLE_REGS_USER) { 1315 if (sample->user_regs.abi) { 1316 result += sizeof(u64); 1317 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1318 result += sz; 1319 } else { 1320 result += sizeof(u64); 1321 } 1322 } 1323 1324 if (type & PERF_SAMPLE_STACK_USER) { 1325 sz = sample->user_stack.size; 1326 result += sizeof(u64); 1327 if (sz) { 1328 result += sz; 1329 result += sizeof(u64); 1330 } 1331 } 1332 1333 if (type & PERF_SAMPLE_WEIGHT) 1334 result += sizeof(u64); 1335 1336 if (type & PERF_SAMPLE_DATA_SRC) 1337 result += sizeof(u64); 1338 1339 if (type & PERF_SAMPLE_TRANSACTION) 1340 result += sizeof(u64); 1341 1342 if (type & PERF_SAMPLE_REGS_INTR) { 1343 if (sample->intr_regs.abi) { 1344 result += sizeof(u64); 1345 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1346 result += sz; 1347 } else { 1348 result += sizeof(u64); 1349 } 1350 } 1351 1352 if (type & PERF_SAMPLE_PHYS_ADDR) 1353 result += sizeof(u64); 1354 1355 if (type & PERF_SAMPLE_CGROUP) 1356 result += sizeof(u64); 1357 1358 if (type & PERF_SAMPLE_AUX) { 1359 result += sizeof(u64); 1360 result += sample->aux_sample.size; 1361 } 1362 1363 return result; 1364 } 1365 1366 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1367 const struct perf_sample *sample) 1368 { 1369 __u64 *array; 1370 size_t sz; 1371 /* 1372 * used for cross-endian analysis. See git commit 65014ab3 1373 * for why this goofiness is needed. 1374 */ 1375 union u64_swap u; 1376 1377 array = event->sample.array; 1378 1379 if (type & PERF_SAMPLE_IDENTIFIER) { 1380 *array = sample->id; 1381 array++; 1382 } 1383 1384 if (type & PERF_SAMPLE_IP) { 1385 *array = sample->ip; 1386 array++; 1387 } 1388 1389 if (type & PERF_SAMPLE_TID) { 1390 u.val32[0] = sample->pid; 1391 u.val32[1] = sample->tid; 1392 *array = u.val64; 1393 array++; 1394 } 1395 1396 if (type & PERF_SAMPLE_TIME) { 1397 *array = sample->time; 1398 array++; 1399 } 1400 1401 if (type & PERF_SAMPLE_ADDR) { 1402 *array = sample->addr; 1403 array++; 1404 } 1405 1406 if (type & PERF_SAMPLE_ID) { 1407 *array = sample->id; 1408 array++; 1409 } 1410 1411 if (type & PERF_SAMPLE_STREAM_ID) { 1412 *array = sample->stream_id; 1413 array++; 1414 } 1415 1416 if (type & PERF_SAMPLE_CPU) { 1417 u.val32[0] = sample->cpu; 1418 u.val32[1] = 0; 1419 *array = u.val64; 1420 array++; 1421 } 1422 1423 if (type & PERF_SAMPLE_PERIOD) { 1424 *array = sample->period; 1425 array++; 1426 } 1427 1428 if (type & PERF_SAMPLE_READ) { 1429 if (read_format & PERF_FORMAT_GROUP) 1430 *array = sample->read.group.nr; 1431 else 1432 *array = sample->read.one.value; 1433 array++; 1434 1435 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1436 *array = sample->read.time_enabled; 1437 array++; 1438 } 1439 1440 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1441 *array = sample->read.time_running; 1442 array++; 1443 } 1444 1445 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1446 if (read_format & PERF_FORMAT_GROUP) { 1447 sz = sample->read.group.nr * 1448 sizeof(struct sample_read_value); 1449 memcpy(array, sample->read.group.values, sz); 1450 array = (void *)array + sz; 1451 } else { 1452 *array = sample->read.one.id; 1453 array++; 1454 } 1455 } 1456 1457 if (type & PERF_SAMPLE_CALLCHAIN) { 1458 sz = (sample->callchain->nr + 1) * sizeof(u64); 1459 memcpy(array, sample->callchain, sz); 1460 array = (void *)array + sz; 1461 } 1462 1463 if (type & PERF_SAMPLE_RAW) { 1464 u.val32[0] = sample->raw_size; 1465 *array = u.val64; 1466 array = (void *)array + sizeof(u32); 1467 1468 memcpy(array, sample->raw_data, sample->raw_size); 1469 array = (void *)array + sample->raw_size; 1470 } 1471 1472 if (type & PERF_SAMPLE_BRANCH_STACK) { 1473 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1474 /* nr, hw_idx */ 1475 sz += 2 * sizeof(u64); 1476 memcpy(array, sample->branch_stack, sz); 1477 array = (void *)array + sz; 1478 } 1479 1480 if (type & PERF_SAMPLE_REGS_USER) { 1481 if (sample->user_regs.abi) { 1482 *array++ = sample->user_regs.abi; 1483 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1484 memcpy(array, sample->user_regs.regs, sz); 1485 array = (void *)array + sz; 1486 } else { 1487 *array++ = 0; 1488 } 1489 } 1490 1491 if (type & PERF_SAMPLE_STACK_USER) { 1492 sz = sample->user_stack.size; 1493 *array++ = sz; 1494 if (sz) { 1495 memcpy(array, sample->user_stack.data, sz); 1496 array = (void *)array + sz; 1497 *array++ = sz; 1498 } 1499 } 1500 1501 if (type & PERF_SAMPLE_WEIGHT) { 1502 *array = sample->weight; 1503 array++; 1504 } 1505 1506 if (type & PERF_SAMPLE_DATA_SRC) { 1507 *array = sample->data_src; 1508 array++; 1509 } 1510 1511 if (type & PERF_SAMPLE_TRANSACTION) { 1512 *array = sample->transaction; 1513 array++; 1514 } 1515 1516 if (type & PERF_SAMPLE_REGS_INTR) { 1517 if (sample->intr_regs.abi) { 1518 *array++ = sample->intr_regs.abi; 1519 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1520 memcpy(array, sample->intr_regs.regs, sz); 1521 array = (void *)array + sz; 1522 } else { 1523 *array++ = 0; 1524 } 1525 } 1526 1527 if (type & PERF_SAMPLE_PHYS_ADDR) { 1528 *array = sample->phys_addr; 1529 array++; 1530 } 1531 1532 if (type & PERF_SAMPLE_CGROUP) { 1533 *array = sample->cgroup; 1534 array++; 1535 } 1536 1537 if (type & PERF_SAMPLE_AUX) { 1538 sz = sample->aux_sample.size; 1539 *array++ = sz; 1540 memcpy(array, sample->aux_sample.data, sz); 1541 array = (void *)array + sz; 1542 } 1543 1544 return 0; 1545 } 1546 1547 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1548 struct evlist *evlist, struct machine *machine) 1549 { 1550 union perf_event *ev; 1551 struct evsel *evsel; 1552 size_t nr = 0, i = 0, sz, max_nr, n; 1553 int err; 1554 1555 pr_debug2("Synthesizing id index\n"); 1556 1557 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / 1558 sizeof(struct id_index_entry); 1559 1560 evlist__for_each_entry(evlist, evsel) 1561 nr += evsel->core.ids; 1562 1563 n = nr > max_nr ? max_nr : nr; 1564 sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry); 1565 ev = zalloc(sz); 1566 if (!ev) 1567 return -ENOMEM; 1568 1569 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1570 ev->id_index.header.size = sz; 1571 ev->id_index.nr = n; 1572 1573 evlist__for_each_entry(evlist, evsel) { 1574 u32 j; 1575 1576 for (j = 0; j < evsel->core.ids; j++) { 1577 struct id_index_entry *e; 1578 struct perf_sample_id *sid; 1579 1580 if (i >= n) { 1581 err = process(tool, ev, NULL, machine); 1582 if (err) 1583 goto out_err; 1584 nr -= n; 1585 i = 0; 1586 } 1587 1588 e = &ev->id_index.entries[i++]; 1589 1590 e->id = evsel->core.id[j]; 1591 1592 sid = perf_evlist__id2sid(evlist, e->id); 1593 if (!sid) { 1594 free(ev); 1595 return -ENOENT; 1596 } 1597 1598 e->idx = sid->idx; 1599 e->cpu = sid->cpu; 1600 e->tid = sid->tid; 1601 } 1602 } 1603 1604 sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry); 1605 ev->id_index.header.size = sz; 1606 ev->id_index.nr = nr; 1607 1608 err = process(tool, ev, NULL, machine); 1609 out_err: 1610 free(ev); 1611 1612 return err; 1613 } 1614 1615 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1616 struct target *target, struct perf_thread_map *threads, 1617 perf_event__handler_t process, bool data_mmap, 1618 unsigned int nr_threads_synthesize) 1619 { 1620 if (target__has_task(target)) 1621 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); 1622 else if (target__has_cpu(target)) 1623 return perf_event__synthesize_threads(tool, process, 1624 machine, data_mmap, 1625 nr_threads_synthesize); 1626 /* command specified */ 1627 return 0; 1628 } 1629 1630 int machine__synthesize_threads(struct machine *machine, struct target *target, 1631 struct perf_thread_map *threads, bool data_mmap, 1632 unsigned int nr_threads_synthesize) 1633 { 1634 return __machine__synthesize_threads(machine, NULL, target, threads, 1635 perf_event__process, data_mmap, 1636 nr_threads_synthesize); 1637 } 1638 1639 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1640 { 1641 struct perf_record_event_update *ev; 1642 1643 size += sizeof(*ev); 1644 size = PERF_ALIGN(size, sizeof(u64)); 1645 1646 ev = zalloc(size); 1647 if (ev) { 1648 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1649 ev->header.size = (u16)size; 1650 ev->type = type; 1651 ev->id = id; 1652 } 1653 return ev; 1654 } 1655 1656 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1657 perf_event__handler_t process) 1658 { 1659 size_t size = strlen(evsel->unit); 1660 struct perf_record_event_update *ev; 1661 int err; 1662 1663 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1664 if (ev == NULL) 1665 return -ENOMEM; 1666 1667 strlcpy(ev->data, evsel->unit, size + 1); 1668 err = process(tool, (union perf_event *)ev, NULL, NULL); 1669 free(ev); 1670 return err; 1671 } 1672 1673 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 1674 perf_event__handler_t process) 1675 { 1676 struct perf_record_event_update *ev; 1677 struct perf_record_event_update_scale *ev_data; 1678 int err; 1679 1680 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 1681 if (ev == NULL) 1682 return -ENOMEM; 1683 1684 ev_data = (struct perf_record_event_update_scale *)ev->data; 1685 ev_data->scale = evsel->scale; 1686 err = process(tool, (union perf_event *)ev, NULL, NULL); 1687 free(ev); 1688 return err; 1689 } 1690 1691 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 1692 perf_event__handler_t process) 1693 { 1694 struct perf_record_event_update *ev; 1695 size_t len = strlen(evsel->name); 1696 int err; 1697 1698 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 1699 if (ev == NULL) 1700 return -ENOMEM; 1701 1702 strlcpy(ev->data, evsel->name, len + 1); 1703 err = process(tool, (union perf_event *)ev, NULL, NULL); 1704 free(ev); 1705 return err; 1706 } 1707 1708 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 1709 perf_event__handler_t process) 1710 { 1711 size_t size = sizeof(struct perf_record_event_update); 1712 struct perf_record_event_update *ev; 1713 int max, err; 1714 u16 type; 1715 1716 if (!evsel->core.own_cpus) 1717 return 0; 1718 1719 ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max); 1720 if (!ev) 1721 return -ENOMEM; 1722 1723 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1724 ev->header.size = (u16)size; 1725 ev->type = PERF_EVENT_UPDATE__CPUS; 1726 ev->id = evsel->core.id[0]; 1727 1728 cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data, 1729 evsel->core.own_cpus, type, max); 1730 1731 err = process(tool, (union perf_event *)ev, NULL, NULL); 1732 free(ev); 1733 return err; 1734 } 1735 1736 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 1737 perf_event__handler_t process) 1738 { 1739 struct evsel *evsel; 1740 int err = 0; 1741 1742 evlist__for_each_entry(evlist, evsel) { 1743 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 1744 evsel->core.id, process); 1745 if (err) { 1746 pr_debug("failed to create perf header attribute\n"); 1747 return err; 1748 } 1749 } 1750 1751 return err; 1752 } 1753 1754 static bool has_unit(struct evsel *evsel) 1755 { 1756 return evsel->unit && *evsel->unit; 1757 } 1758 1759 static bool has_scale(struct evsel *evsel) 1760 { 1761 return evsel->scale != 1; 1762 } 1763 1764 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 1765 perf_event__handler_t process, bool is_pipe) 1766 { 1767 struct evsel *evsel; 1768 int err; 1769 1770 /* 1771 * Synthesize other events stuff not carried within 1772 * attr event - unit, scale, name 1773 */ 1774 evlist__for_each_entry(evsel_list, evsel) { 1775 if (!evsel->supported) 1776 continue; 1777 1778 /* 1779 * Synthesize unit and scale only if it's defined. 1780 */ 1781 if (has_unit(evsel)) { 1782 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 1783 if (err < 0) { 1784 pr_err("Couldn't synthesize evsel unit.\n"); 1785 return err; 1786 } 1787 } 1788 1789 if (has_scale(evsel)) { 1790 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 1791 if (err < 0) { 1792 pr_err("Couldn't synthesize evsel evsel.\n"); 1793 return err; 1794 } 1795 } 1796 1797 if (evsel->core.own_cpus) { 1798 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 1799 if (err < 0) { 1800 pr_err("Couldn't synthesize evsel cpus.\n"); 1801 return err; 1802 } 1803 } 1804 1805 /* 1806 * Name is needed only for pipe output, 1807 * perf.data carries event names. 1808 */ 1809 if (is_pipe) { 1810 err = perf_event__synthesize_event_update_name(tool, evsel, process); 1811 if (err < 0) { 1812 pr_err("Couldn't synthesize evsel name.\n"); 1813 return err; 1814 } 1815 } 1816 } 1817 return 0; 1818 } 1819 1820 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 1821 u32 ids, u64 *id, perf_event__handler_t process) 1822 { 1823 union perf_event *ev; 1824 size_t size; 1825 int err; 1826 1827 size = sizeof(struct perf_event_attr); 1828 size = PERF_ALIGN(size, sizeof(u64)); 1829 size += sizeof(struct perf_event_header); 1830 size += ids * sizeof(u64); 1831 1832 ev = zalloc(size); 1833 1834 if (ev == NULL) 1835 return -ENOMEM; 1836 1837 ev->attr.attr = *attr; 1838 memcpy(ev->attr.id, id, ids * sizeof(u64)); 1839 1840 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 1841 ev->attr.header.size = (u16)size; 1842 1843 if (ev->attr.header.size == size) 1844 err = process(tool, ev, NULL, NULL); 1845 else 1846 err = -E2BIG; 1847 1848 free(ev); 1849 1850 return err; 1851 } 1852 1853 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 1854 perf_event__handler_t process) 1855 { 1856 union perf_event ev; 1857 struct tracing_data *tdata; 1858 ssize_t size = 0, aligned_size = 0, padding; 1859 struct feat_fd ff; 1860 1861 /* 1862 * We are going to store the size of the data followed 1863 * by the data contents. Since the fd descriptor is a pipe, 1864 * we cannot seek back to store the size of the data once 1865 * we know it. Instead we: 1866 * 1867 * - write the tracing data to the temp file 1868 * - get/write the data size to pipe 1869 * - write the tracing data from the temp file 1870 * to the pipe 1871 */ 1872 tdata = tracing_data_get(&evlist->core.entries, fd, true); 1873 if (!tdata) 1874 return -1; 1875 1876 memset(&ev, 0, sizeof(ev)); 1877 1878 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 1879 size = tdata->size; 1880 aligned_size = PERF_ALIGN(size, sizeof(u64)); 1881 padding = aligned_size - size; 1882 ev.tracing_data.header.size = sizeof(ev.tracing_data); 1883 ev.tracing_data.size = aligned_size; 1884 1885 process(tool, &ev, NULL, NULL); 1886 1887 /* 1888 * The put function will copy all the tracing data 1889 * stored in temp file to the pipe. 1890 */ 1891 tracing_data_put(tdata); 1892 1893 ff = (struct feat_fd){ .fd = fd }; 1894 if (write_padded(&ff, NULL, 0, padding)) 1895 return -1; 1896 1897 return aligned_size; 1898 } 1899 1900 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 1901 perf_event__handler_t process, struct machine *machine) 1902 { 1903 union perf_event ev; 1904 size_t len; 1905 1906 if (!pos->hit) 1907 return 0; 1908 1909 memset(&ev, 0, sizeof(ev)); 1910 1911 len = pos->long_name_len + 1; 1912 len = PERF_ALIGN(len, NAME_ALIGN); 1913 memcpy(&ev.build_id.build_id, pos->build_id, sizeof(pos->build_id)); 1914 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 1915 ev.build_id.header.misc = misc; 1916 ev.build_id.pid = machine->pid; 1917 ev.build_id.header.size = sizeof(ev.build_id) + len; 1918 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 1919 1920 return process(tool, &ev, NULL, machine); 1921 } 1922 1923 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 1924 struct evlist *evlist, perf_event__handler_t process, bool attrs) 1925 { 1926 int err; 1927 1928 if (attrs) { 1929 err = perf_event__synthesize_attrs(tool, evlist, process); 1930 if (err < 0) { 1931 pr_err("Couldn't synthesize attrs.\n"); 1932 return err; 1933 } 1934 } 1935 1936 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 1937 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 1938 if (err < 0) { 1939 pr_err("Couldn't synthesize thread map.\n"); 1940 return err; 1941 } 1942 1943 err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL); 1944 if (err < 0) { 1945 pr_err("Couldn't synthesize thread map.\n"); 1946 return err; 1947 } 1948 1949 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 1950 if (err < 0) { 1951 pr_err("Couldn't synthesize config.\n"); 1952 return err; 1953 } 1954 1955 return 0; 1956 } 1957 1958 int __weak perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused, 1959 struct perf_tool *tool __maybe_unused, 1960 perf_event__handler_t process __maybe_unused, 1961 struct machine *machine __maybe_unused) 1962 { 1963 return 0; 1964 } 1965 1966 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 1967 1968 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 1969 struct evlist *evlist, perf_event__handler_t process) 1970 { 1971 struct perf_header *header = &session->header; 1972 struct perf_record_header_feature *fe; 1973 struct feat_fd ff; 1974 size_t sz, sz_hdr; 1975 int feat, ret; 1976 1977 sz_hdr = sizeof(fe->header); 1978 sz = sizeof(union perf_event); 1979 /* get a nice alignment */ 1980 sz = PERF_ALIGN(sz, page_size); 1981 1982 memset(&ff, 0, sizeof(ff)); 1983 1984 ff.buf = malloc(sz); 1985 if (!ff.buf) 1986 return -ENOMEM; 1987 1988 ff.size = sz - sz_hdr; 1989 ff.ph = &session->header; 1990 1991 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 1992 if (!feat_ops[feat].synthesize) { 1993 pr_debug("No record header feature for header :%d\n", feat); 1994 continue; 1995 } 1996 1997 ff.offset = sizeof(*fe); 1998 1999 ret = feat_ops[feat].write(&ff, evlist); 2000 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2001 pr_debug("Error writing feature\n"); 2002 continue; 2003 } 2004 /* ff.buf may have changed due to realloc in do_write() */ 2005 fe = ff.buf; 2006 memset(fe, 0, sizeof(*fe)); 2007 2008 fe->feat_id = feat; 2009 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2010 fe->header.size = ff.offset; 2011 2012 ret = process(tool, ff.buf, NULL, NULL); 2013 if (ret) { 2014 free(ff.buf); 2015 return ret; 2016 } 2017 } 2018 2019 /* Send HEADER_LAST_FEATURE mark. */ 2020 fe = ff.buf; 2021 fe->feat_id = HEADER_LAST_FEATURE; 2022 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2023 fe->header.size = sizeof(*fe); 2024 2025 ret = process(tool, ff.buf, NULL, NULL); 2026 2027 free(ff.buf); 2028 return ret; 2029 } 2030