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 <api/io.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <fcntl.h> 44 #include <unistd.h> 45 46 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500 47 48 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT; 49 50 int perf_tool__process_synth_event(struct perf_tool *tool, 51 union perf_event *event, 52 struct machine *machine, 53 perf_event__handler_t process) 54 { 55 struct perf_sample synth_sample = { 56 .pid = -1, 57 .tid = -1, 58 .time = -1, 59 .stream_id = -1, 60 .cpu = -1, 61 .period = 1, 62 .cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK, 63 }; 64 65 return process(tool, event, &synth_sample, machine); 66 }; 67 68 /* 69 * Assumes that the first 4095 bytes of /proc/pid/stat contains 70 * the comm, tgid and ppid. 71 */ 72 static int perf_event__get_comm_ids(pid_t pid, char *comm, size_t len, 73 pid_t *tgid, pid_t *ppid) 74 { 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(bf, sizeof(bf), "/proc/%d/status", pid); 85 86 fd = open(bf, O_RDONLY); 87 if (fd < 0) { 88 pr_debug("couldn't open %s\n", bf); 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 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end, 278 u32 *prot, u32 *flags, __u64 *offset, 279 u32 *maj, u32 *min, 280 __u64 *inode, 281 ssize_t pathname_size, char *pathname) 282 { 283 __u64 temp; 284 int ch; 285 char *start_pathname = pathname; 286 287 if (io__get_hex(io, start) != '-') 288 return false; 289 if (io__get_hex(io, end) != ' ') 290 return false; 291 292 /* map protection and flags bits */ 293 *prot = 0; 294 ch = io__get_char(io); 295 if (ch == 'r') 296 *prot |= PROT_READ; 297 else if (ch != '-') 298 return false; 299 ch = io__get_char(io); 300 if (ch == 'w') 301 *prot |= PROT_WRITE; 302 else if (ch != '-') 303 return false; 304 ch = io__get_char(io); 305 if (ch == 'x') 306 *prot |= PROT_EXEC; 307 else if (ch != '-') 308 return false; 309 ch = io__get_char(io); 310 if (ch == 's') 311 *flags = MAP_SHARED; 312 else if (ch == 'p') 313 *flags = MAP_PRIVATE; 314 else 315 return false; 316 if (io__get_char(io) != ' ') 317 return false; 318 319 if (io__get_hex(io, offset) != ' ') 320 return false; 321 322 if (io__get_hex(io, &temp) != ':') 323 return false; 324 *maj = temp; 325 if (io__get_hex(io, &temp) != ' ') 326 return false; 327 *min = temp; 328 329 ch = io__get_dec(io, inode); 330 if (ch != ' ') { 331 *pathname = '\0'; 332 return ch == '\n'; 333 } 334 do { 335 ch = io__get_char(io); 336 } while (ch == ' '); 337 while (true) { 338 if (ch < 0) 339 return false; 340 if (ch == '\0' || ch == '\n' || 341 (pathname + 1 - start_pathname) >= pathname_size) { 342 *pathname = '\0'; 343 return true; 344 } 345 *pathname++ = ch; 346 ch = io__get_char(io); 347 } 348 } 349 350 int perf_event__synthesize_mmap_events(struct perf_tool *tool, 351 union perf_event *event, 352 pid_t pid, pid_t tgid, 353 perf_event__handler_t process, 354 struct machine *machine, 355 bool mmap_data) 356 { 357 unsigned long long t; 358 char bf[BUFSIZ]; 359 struct io io; 360 bool truncation = false; 361 unsigned long long timeout = proc_map_timeout * 1000000ULL; 362 int rc = 0; 363 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 364 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 365 366 if (machine__is_default_guest(machine)) 367 return 0; 368 369 snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps", 370 machine->root_dir, pid, pid); 371 372 io.fd = open(bf, O_RDONLY, 0); 373 if (io.fd < 0) { 374 /* 375 * We raced with a task exiting - just return: 376 */ 377 pr_debug("couldn't open %s\n", bf); 378 return -1; 379 } 380 io__init(&io, io.fd, bf, sizeof(bf)); 381 382 event->header.type = PERF_RECORD_MMAP2; 383 t = rdclock(); 384 385 while (!io.eof) { 386 static const char anonstr[] = "//anon"; 387 size_t size; 388 389 /* ensure null termination since stack will be reused. */ 390 event->mmap2.filename[0] = '\0'; 391 392 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 393 if (!read_proc_maps_line(&io, 394 &event->mmap2.start, 395 &event->mmap2.len, 396 &event->mmap2.prot, 397 &event->mmap2.flags, 398 &event->mmap2.pgoff, 399 &event->mmap2.maj, 400 &event->mmap2.min, 401 &event->mmap2.ino, 402 sizeof(event->mmap2.filename), 403 event->mmap2.filename)) 404 continue; 405 406 if ((rdclock() - t) > timeout) { 407 pr_warning("Reading %s/proc/%d/task/%d/maps time out. " 408 "You may want to increase " 409 "the time limit by --proc-map-timeout\n", 410 machine->root_dir, pid, pid); 411 truncation = true; 412 goto out; 413 } 414 415 event->mmap2.ino_generation = 0; 416 417 /* 418 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 419 */ 420 if (machine__is_host(machine)) 421 event->header.misc = PERF_RECORD_MISC_USER; 422 else 423 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 424 425 if ((event->mmap2.prot & PROT_EXEC) == 0) { 426 if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0) 427 continue; 428 429 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 430 } 431 432 out: 433 if (truncation) 434 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 435 436 if (!strcmp(event->mmap2.filename, "")) 437 strcpy(event->mmap2.filename, anonstr); 438 439 if (hugetlbfs_mnt_len && 440 !strncmp(event->mmap2.filename, hugetlbfs_mnt, 441 hugetlbfs_mnt_len)) { 442 strcpy(event->mmap2.filename, anonstr); 443 event->mmap2.flags |= MAP_HUGETLB; 444 } 445 446 size = strlen(event->mmap2.filename) + 1; 447 size = PERF_ALIGN(size, sizeof(u64)); 448 event->mmap2.len -= event->mmap.start; 449 event->mmap2.header.size = (sizeof(event->mmap2) - 450 (sizeof(event->mmap2.filename) - size)); 451 memset(event->mmap2.filename + size, 0, machine->id_hdr_size); 452 event->mmap2.header.size += machine->id_hdr_size; 453 event->mmap2.pid = tgid; 454 event->mmap2.tid = pid; 455 456 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 457 rc = -1; 458 break; 459 } 460 461 if (truncation) 462 break; 463 } 464 465 close(io.fd); 466 return rc; 467 } 468 469 #ifdef HAVE_FILE_HANDLE 470 static int perf_event__synthesize_cgroup(struct perf_tool *tool, 471 union perf_event *event, 472 char *path, size_t mount_len, 473 perf_event__handler_t process, 474 struct machine *machine) 475 { 476 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 477 size_t path_len = strlen(path) - mount_len + 1; 478 struct { 479 struct file_handle fh; 480 uint64_t cgroup_id; 481 } handle; 482 int mount_id; 483 484 while (path_len % sizeof(u64)) 485 path[mount_len + path_len++] = '\0'; 486 487 memset(&event->cgroup, 0, event_size); 488 489 event->cgroup.header.type = PERF_RECORD_CGROUP; 490 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 491 492 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 493 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 494 pr_debug("stat failed: %s\n", path); 495 return -1; 496 } 497 498 event->cgroup.id = handle.cgroup_id; 499 strncpy(event->cgroup.path, path + mount_len, path_len); 500 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 501 502 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 503 pr_debug("process synth event failed\n"); 504 return -1; 505 } 506 507 return 0; 508 } 509 510 static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 511 union perf_event *event, 512 char *path, size_t mount_len, 513 perf_event__handler_t process, 514 struct machine *machine) 515 { 516 size_t pos = strlen(path); 517 DIR *d; 518 struct dirent *dent; 519 int ret = 0; 520 521 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 522 process, machine) < 0) 523 return -1; 524 525 d = opendir(path); 526 if (d == NULL) { 527 pr_debug("failed to open directory: %s\n", path); 528 return -1; 529 } 530 531 while ((dent = readdir(d)) != NULL) { 532 if (dent->d_type != DT_DIR) 533 continue; 534 if (!strcmp(dent->d_name, ".") || 535 !strcmp(dent->d_name, "..")) 536 continue; 537 538 /* any sane path should be less than PATH_MAX */ 539 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 540 continue; 541 542 if (path[pos - 1] != '/') 543 strcat(path, "/"); 544 strcat(path, dent->d_name); 545 546 ret = perf_event__walk_cgroup_tree(tool, event, path, 547 mount_len, process, machine); 548 if (ret < 0) 549 break; 550 551 path[pos] = '\0'; 552 } 553 554 closedir(d); 555 return ret; 556 } 557 558 int perf_event__synthesize_cgroups(struct perf_tool *tool, 559 perf_event__handler_t process, 560 struct machine *machine) 561 { 562 union perf_event event; 563 char cgrp_root[PATH_MAX]; 564 size_t mount_len; /* length of mount point in the path */ 565 566 if (!tool || !tool->cgroup_events) 567 return 0; 568 569 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 570 pr_debug("cannot find cgroup mount point\n"); 571 return -1; 572 } 573 574 mount_len = strlen(cgrp_root); 575 /* make sure the path starts with a slash (after mount point) */ 576 strcat(cgrp_root, "/"); 577 578 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 579 process, machine) < 0) 580 return -1; 581 582 return 0; 583 } 584 #else 585 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 586 perf_event__handler_t process __maybe_unused, 587 struct machine *machine __maybe_unused) 588 { 589 return -1; 590 } 591 #endif 592 593 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 594 struct machine *machine) 595 { 596 int rc = 0; 597 struct map *pos; 598 struct maps *maps = machine__kernel_maps(machine); 599 union perf_event *event = zalloc((sizeof(event->mmap) + 600 machine->id_hdr_size)); 601 if (event == NULL) { 602 pr_debug("Not enough memory synthesizing mmap event " 603 "for kernel modules\n"); 604 return -1; 605 } 606 607 event->header.type = PERF_RECORD_MMAP; 608 609 /* 610 * kernel uses 0 for user space maps, see kernel/perf_event.c 611 * __perf_event_mmap 612 */ 613 if (machine__is_host(machine)) 614 event->header.misc = PERF_RECORD_MISC_KERNEL; 615 else 616 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 617 618 maps__for_each_entry(maps, pos) { 619 size_t size; 620 621 if (!__map__is_kmodule(pos)) 622 continue; 623 624 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 625 event->mmap.header.type = PERF_RECORD_MMAP; 626 event->mmap.header.size = (sizeof(event->mmap) - 627 (sizeof(event->mmap.filename) - size)); 628 memset(event->mmap.filename + size, 0, machine->id_hdr_size); 629 event->mmap.header.size += machine->id_hdr_size; 630 event->mmap.start = pos->start; 631 event->mmap.len = pos->end - pos->start; 632 event->mmap.pid = machine->pid; 633 634 memcpy(event->mmap.filename, pos->dso->long_name, 635 pos->dso->long_name_len + 1); 636 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 637 rc = -1; 638 break; 639 } 640 } 641 642 free(event); 643 return rc; 644 } 645 646 static int __event__synthesize_thread(union perf_event *comm_event, 647 union perf_event *mmap_event, 648 union perf_event *fork_event, 649 union perf_event *namespaces_event, 650 pid_t pid, int full, perf_event__handler_t process, 651 struct perf_tool *tool, struct machine *machine, bool mmap_data) 652 { 653 char filename[PATH_MAX]; 654 DIR *tasks; 655 struct dirent *dirent; 656 pid_t tgid, ppid; 657 int rc = 0; 658 659 /* special case: only send one comm event using passed in pid */ 660 if (!full) { 661 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 662 process, machine); 663 664 if (tgid == -1) 665 return -1; 666 667 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 668 tgid, process, machine) < 0) 669 return -1; 670 671 /* 672 * send mmap only for thread group leader 673 * see thread__init_maps() 674 */ 675 if (pid == tgid && 676 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 677 process, machine, mmap_data)) 678 return -1; 679 680 return 0; 681 } 682 683 if (machine__is_default_guest(machine)) 684 return 0; 685 686 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 687 machine->root_dir, pid); 688 689 tasks = opendir(filename); 690 if (tasks == NULL) { 691 pr_debug("couldn't open %s\n", filename); 692 return 0; 693 } 694 695 while ((dirent = readdir(tasks)) != NULL) { 696 char *end; 697 pid_t _pid; 698 699 _pid = strtol(dirent->d_name, &end, 10); 700 if (*end) 701 continue; 702 703 rc = -1; 704 if (perf_event__prepare_comm(comm_event, _pid, machine, 705 &tgid, &ppid) != 0) 706 break; 707 708 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 709 ppid, process, machine) < 0) 710 break; 711 712 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 713 tgid, process, machine) < 0) 714 break; 715 716 /* 717 * Send the prepared comm event 718 */ 719 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 720 break; 721 722 rc = 0; 723 if (_pid == pid) { 724 /* process the parent's maps too */ 725 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 726 process, machine, mmap_data); 727 if (rc) 728 break; 729 } 730 } 731 732 closedir(tasks); 733 return rc; 734 } 735 736 int perf_event__synthesize_thread_map(struct perf_tool *tool, 737 struct perf_thread_map *threads, 738 perf_event__handler_t process, 739 struct machine *machine, 740 bool mmap_data) 741 { 742 union perf_event *comm_event, *mmap_event, *fork_event; 743 union perf_event *namespaces_event; 744 int err = -1, thread, j; 745 746 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 747 if (comm_event == NULL) 748 goto out; 749 750 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 751 if (mmap_event == NULL) 752 goto out_free_comm; 753 754 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 755 if (fork_event == NULL) 756 goto out_free_mmap; 757 758 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 759 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 760 machine->id_hdr_size); 761 if (namespaces_event == NULL) 762 goto out_free_fork; 763 764 err = 0; 765 for (thread = 0; thread < threads->nr; ++thread) { 766 if (__event__synthesize_thread(comm_event, mmap_event, 767 fork_event, namespaces_event, 768 perf_thread_map__pid(threads, thread), 0, 769 process, tool, machine, 770 mmap_data)) { 771 err = -1; 772 break; 773 } 774 775 /* 776 * comm.pid is set to thread group id by 777 * perf_event__synthesize_comm 778 */ 779 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 780 bool need_leader = true; 781 782 /* is thread group leader in thread_map? */ 783 for (j = 0; j < threads->nr; ++j) { 784 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 785 need_leader = false; 786 break; 787 } 788 } 789 790 /* if not, generate events for it */ 791 if (need_leader && 792 __event__synthesize_thread(comm_event, mmap_event, 793 fork_event, namespaces_event, 794 comm_event->comm.pid, 0, 795 process, tool, machine, 796 mmap_data)) { 797 err = -1; 798 break; 799 } 800 } 801 } 802 free(namespaces_event); 803 out_free_fork: 804 free(fork_event); 805 out_free_mmap: 806 free(mmap_event); 807 out_free_comm: 808 free(comm_event); 809 out: 810 return err; 811 } 812 813 static int __perf_event__synthesize_threads(struct perf_tool *tool, 814 perf_event__handler_t process, 815 struct machine *machine, 816 bool mmap_data, 817 struct dirent **dirent, 818 int start, 819 int num) 820 { 821 union perf_event *comm_event, *mmap_event, *fork_event; 822 union perf_event *namespaces_event; 823 int err = -1; 824 char *end; 825 pid_t pid; 826 int i; 827 828 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 829 if (comm_event == NULL) 830 goto out; 831 832 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 833 if (mmap_event == NULL) 834 goto out_free_comm; 835 836 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 837 if (fork_event == NULL) 838 goto out_free_mmap; 839 840 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 841 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 842 machine->id_hdr_size); 843 if (namespaces_event == NULL) 844 goto out_free_fork; 845 846 for (i = start; i < start + num; i++) { 847 if (!isdigit(dirent[i]->d_name[0])) 848 continue; 849 850 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 851 /* only interested in proper numerical dirents */ 852 if (*end) 853 continue; 854 /* 855 * We may race with exiting thread, so don't stop just because 856 * one thread couldn't be synthesized. 857 */ 858 __event__synthesize_thread(comm_event, mmap_event, fork_event, 859 namespaces_event, pid, 1, process, 860 tool, machine, mmap_data); 861 } 862 err = 0; 863 864 free(namespaces_event); 865 out_free_fork: 866 free(fork_event); 867 out_free_mmap: 868 free(mmap_event); 869 out_free_comm: 870 free(comm_event); 871 out: 872 return err; 873 } 874 875 struct synthesize_threads_arg { 876 struct perf_tool *tool; 877 perf_event__handler_t process; 878 struct machine *machine; 879 bool mmap_data; 880 struct dirent **dirent; 881 int num; 882 int start; 883 }; 884 885 static void *synthesize_threads_worker(void *arg) 886 { 887 struct synthesize_threads_arg *args = arg; 888 889 __perf_event__synthesize_threads(args->tool, args->process, 890 args->machine, args->mmap_data, 891 args->dirent, 892 args->start, args->num); 893 return NULL; 894 } 895 896 int perf_event__synthesize_threads(struct perf_tool *tool, 897 perf_event__handler_t process, 898 struct machine *machine, 899 bool mmap_data, 900 unsigned int nr_threads_synthesize) 901 { 902 struct synthesize_threads_arg *args = NULL; 903 pthread_t *synthesize_threads = NULL; 904 char proc_path[PATH_MAX]; 905 struct dirent **dirent; 906 int num_per_thread; 907 int m, n, i, j; 908 int thread_nr; 909 int base = 0; 910 int err = -1; 911 912 913 if (machine__is_default_guest(machine)) 914 return 0; 915 916 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 917 n = scandir(proc_path, &dirent, 0, alphasort); 918 if (n < 0) 919 return err; 920 921 if (nr_threads_synthesize == UINT_MAX) 922 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 923 else 924 thread_nr = nr_threads_synthesize; 925 926 if (thread_nr <= 1) { 927 err = __perf_event__synthesize_threads(tool, process, 928 machine, mmap_data, 929 dirent, base, n); 930 goto free_dirent; 931 } 932 if (thread_nr > n) 933 thread_nr = n; 934 935 synthesize_threads = calloc(sizeof(pthread_t), thread_nr); 936 if (synthesize_threads == NULL) 937 goto free_dirent; 938 939 args = calloc(sizeof(*args), thread_nr); 940 if (args == NULL) 941 goto free_threads; 942 943 num_per_thread = n / thread_nr; 944 m = n % thread_nr; 945 for (i = 0; i < thread_nr; i++) { 946 args[i].tool = tool; 947 args[i].process = process; 948 args[i].machine = machine; 949 args[i].mmap_data = mmap_data; 950 args[i].dirent = dirent; 951 } 952 for (i = 0; i < m; i++) { 953 args[i].num = num_per_thread + 1; 954 args[i].start = i * args[i].num; 955 } 956 if (i != 0) 957 base = args[i-1].start + args[i-1].num; 958 for (j = i; j < thread_nr; j++) { 959 args[j].num = num_per_thread; 960 args[j].start = base + (j - i) * args[i].num; 961 } 962 963 for (i = 0; i < thread_nr; i++) { 964 if (pthread_create(&synthesize_threads[i], NULL, 965 synthesize_threads_worker, &args[i])) 966 goto out_join; 967 } 968 err = 0; 969 out_join: 970 for (i = 0; i < thread_nr; i++) 971 pthread_join(synthesize_threads[i], NULL); 972 free(args); 973 free_threads: 974 free(synthesize_threads); 975 free_dirent: 976 for (i = 0; i < n; i++) 977 zfree(&dirent[i]); 978 free(dirent); 979 980 return err; 981 } 982 983 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 984 perf_event__handler_t process __maybe_unused, 985 struct machine *machine __maybe_unused) 986 { 987 return 0; 988 } 989 990 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 991 perf_event__handler_t process, 992 struct machine *machine) 993 { 994 size_t size; 995 struct map *map = machine__kernel_map(machine); 996 struct kmap *kmap; 997 int err; 998 union perf_event *event; 999 1000 if (map == NULL) 1001 return -1; 1002 1003 kmap = map__kmap(map); 1004 if (!kmap->ref_reloc_sym) 1005 return -1; 1006 1007 /* 1008 * We should get this from /sys/kernel/sections/.text, but till that is 1009 * available use this, and after it is use this as a fallback for older 1010 * kernels. 1011 */ 1012 event = zalloc((sizeof(event->mmap) + machine->id_hdr_size)); 1013 if (event == NULL) { 1014 pr_debug("Not enough memory synthesizing mmap event " 1015 "for kernel modules\n"); 1016 return -1; 1017 } 1018 1019 if (machine__is_host(machine)) { 1020 /* 1021 * kernel uses PERF_RECORD_MISC_USER for user space maps, 1022 * see kernel/perf_event.c __perf_event_mmap 1023 */ 1024 event->header.misc = PERF_RECORD_MISC_KERNEL; 1025 } else { 1026 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 1027 } 1028 1029 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 1030 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1031 size = PERF_ALIGN(size, sizeof(u64)); 1032 event->mmap.header.type = PERF_RECORD_MMAP; 1033 event->mmap.header.size = (sizeof(event->mmap) - 1034 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 1035 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 1036 event->mmap.start = map->start; 1037 event->mmap.len = map->end - event->mmap.start; 1038 event->mmap.pid = machine->pid; 1039 1040 err = perf_tool__process_synth_event(tool, event, machine, process); 1041 free(event); 1042 1043 return err; 1044 } 1045 1046 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1047 perf_event__handler_t process, 1048 struct machine *machine) 1049 { 1050 int err; 1051 1052 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 1053 if (err < 0) 1054 return err; 1055 1056 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1057 } 1058 1059 int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1060 struct perf_thread_map *threads, 1061 perf_event__handler_t process, 1062 struct machine *machine) 1063 { 1064 union perf_event *event; 1065 int i, err, size; 1066 1067 size = sizeof(event->thread_map); 1068 size += threads->nr * sizeof(event->thread_map.entries[0]); 1069 1070 event = zalloc(size); 1071 if (!event) 1072 return -ENOMEM; 1073 1074 event->header.type = PERF_RECORD_THREAD_MAP; 1075 event->header.size = size; 1076 event->thread_map.nr = threads->nr; 1077 1078 for (i = 0; i < threads->nr; i++) { 1079 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1080 char *comm = perf_thread_map__comm(threads, i); 1081 1082 if (!comm) 1083 comm = (char *) ""; 1084 1085 entry->pid = perf_thread_map__pid(threads, i); 1086 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1087 } 1088 1089 err = process(tool, event, NULL, machine); 1090 1091 free(event); 1092 return err; 1093 } 1094 1095 static void synthesize_cpus(struct cpu_map_entries *cpus, 1096 struct perf_cpu_map *map) 1097 { 1098 int i; 1099 1100 cpus->nr = map->nr; 1101 1102 for (i = 0; i < map->nr; i++) 1103 cpus->cpu[i] = map->map[i]; 1104 } 1105 1106 static void synthesize_mask(struct perf_record_record_cpu_map *mask, 1107 struct perf_cpu_map *map, int max) 1108 { 1109 int i; 1110 1111 mask->nr = BITS_TO_LONGS(max); 1112 mask->long_size = sizeof(long); 1113 1114 for (i = 0; i < map->nr; i++) 1115 set_bit(map->map[i], mask->mask); 1116 } 1117 1118 static size_t cpus_size(struct perf_cpu_map *map) 1119 { 1120 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16); 1121 } 1122 1123 static size_t mask_size(struct perf_cpu_map *map, int *max) 1124 { 1125 int i; 1126 1127 *max = 0; 1128 1129 for (i = 0; i < map->nr; i++) { 1130 /* bit possition of the cpu is + 1 */ 1131 int bit = map->map[i] + 1; 1132 1133 if (bit > *max) 1134 *max = bit; 1135 } 1136 1137 return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long); 1138 } 1139 1140 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max) 1141 { 1142 size_t size_cpus, size_mask; 1143 bool is_dummy = perf_cpu_map__empty(map); 1144 1145 /* 1146 * Both array and mask data have variable size based 1147 * on the number of cpus and their actual values. 1148 * The size of the 'struct perf_record_cpu_map_data' is: 1149 * 1150 * array = size of 'struct cpu_map_entries' + 1151 * number of cpus * sizeof(u64) 1152 * 1153 * mask = size of 'struct perf_record_record_cpu_map' + 1154 * maximum cpu bit converted to size of longs 1155 * 1156 * and finaly + the size of 'struct perf_record_cpu_map_data'. 1157 */ 1158 size_cpus = cpus_size(map); 1159 size_mask = mask_size(map, max); 1160 1161 if (is_dummy || (size_cpus < size_mask)) { 1162 *size += size_cpus; 1163 *type = PERF_CPU_MAP__CPUS; 1164 } else { 1165 *size += size_mask; 1166 *type = PERF_CPU_MAP__MASK; 1167 } 1168 1169 *size += sizeof(struct perf_record_cpu_map_data); 1170 *size = PERF_ALIGN(*size, sizeof(u64)); 1171 return zalloc(*size); 1172 } 1173 1174 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map, 1175 u16 type, int max) 1176 { 1177 data->type = type; 1178 1179 switch (type) { 1180 case PERF_CPU_MAP__CPUS: 1181 synthesize_cpus((struct cpu_map_entries *) data->data, map); 1182 break; 1183 case PERF_CPU_MAP__MASK: 1184 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max); 1185 default: 1186 break; 1187 } 1188 } 1189 1190 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map) 1191 { 1192 size_t size = sizeof(struct perf_record_cpu_map); 1193 struct perf_record_cpu_map *event; 1194 int max; 1195 u16 type; 1196 1197 event = cpu_map_data__alloc(map, &size, &type, &max); 1198 if (!event) 1199 return NULL; 1200 1201 event->header.type = PERF_RECORD_CPU_MAP; 1202 event->header.size = size; 1203 event->data.type = type; 1204 1205 cpu_map_data__synthesize(&event->data, map, type, max); 1206 return event; 1207 } 1208 1209 int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1210 struct perf_cpu_map *map, 1211 perf_event__handler_t process, 1212 struct machine *machine) 1213 { 1214 struct perf_record_cpu_map *event; 1215 int err; 1216 1217 event = cpu_map_event__new(map); 1218 if (!event) 1219 return -ENOMEM; 1220 1221 err = process(tool, (union perf_event *) event, NULL, machine); 1222 1223 free(event); 1224 return err; 1225 } 1226 1227 int perf_event__synthesize_stat_config(struct perf_tool *tool, 1228 struct perf_stat_config *config, 1229 perf_event__handler_t process, 1230 struct machine *machine) 1231 { 1232 struct perf_record_stat_config *event; 1233 int size, i = 0, err; 1234 1235 size = sizeof(*event); 1236 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1237 1238 event = zalloc(size); 1239 if (!event) 1240 return -ENOMEM; 1241 1242 event->header.type = PERF_RECORD_STAT_CONFIG; 1243 event->header.size = size; 1244 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1245 1246 #define ADD(__term, __val) \ 1247 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1248 event->data[i].val = __val; \ 1249 i++; 1250 1251 ADD(AGGR_MODE, config->aggr_mode) 1252 ADD(INTERVAL, config->interval) 1253 ADD(SCALE, config->scale) 1254 1255 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1256 "stat config terms unbalanced\n"); 1257 #undef ADD 1258 1259 err = process(tool, (union perf_event *) event, NULL, machine); 1260 1261 free(event); 1262 return err; 1263 } 1264 1265 int perf_event__synthesize_stat(struct perf_tool *tool, 1266 u32 cpu, u32 thread, u64 id, 1267 struct perf_counts_values *count, 1268 perf_event__handler_t process, 1269 struct machine *machine) 1270 { 1271 struct perf_record_stat event; 1272 1273 event.header.type = PERF_RECORD_STAT; 1274 event.header.size = sizeof(event); 1275 event.header.misc = 0; 1276 1277 event.id = id; 1278 event.cpu = cpu; 1279 event.thread = thread; 1280 event.val = count->val; 1281 event.ena = count->ena; 1282 event.run = count->run; 1283 1284 return process(tool, (union perf_event *) &event, NULL, machine); 1285 } 1286 1287 int perf_event__synthesize_stat_round(struct perf_tool *tool, 1288 u64 evtime, u64 type, 1289 perf_event__handler_t process, 1290 struct machine *machine) 1291 { 1292 struct perf_record_stat_round event; 1293 1294 event.header.type = PERF_RECORD_STAT_ROUND; 1295 event.header.size = sizeof(event); 1296 event.header.misc = 0; 1297 1298 event.time = evtime; 1299 event.type = type; 1300 1301 return process(tool, (union perf_event *) &event, NULL, machine); 1302 } 1303 1304 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1305 { 1306 size_t sz, result = sizeof(struct perf_record_sample); 1307 1308 if (type & PERF_SAMPLE_IDENTIFIER) 1309 result += sizeof(u64); 1310 1311 if (type & PERF_SAMPLE_IP) 1312 result += sizeof(u64); 1313 1314 if (type & PERF_SAMPLE_TID) 1315 result += sizeof(u64); 1316 1317 if (type & PERF_SAMPLE_TIME) 1318 result += sizeof(u64); 1319 1320 if (type & PERF_SAMPLE_ADDR) 1321 result += sizeof(u64); 1322 1323 if (type & PERF_SAMPLE_ID) 1324 result += sizeof(u64); 1325 1326 if (type & PERF_SAMPLE_STREAM_ID) 1327 result += sizeof(u64); 1328 1329 if (type & PERF_SAMPLE_CPU) 1330 result += sizeof(u64); 1331 1332 if (type & PERF_SAMPLE_PERIOD) 1333 result += sizeof(u64); 1334 1335 if (type & PERF_SAMPLE_READ) { 1336 result += sizeof(u64); 1337 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1338 result += sizeof(u64); 1339 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1340 result += sizeof(u64); 1341 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1342 if (read_format & PERF_FORMAT_GROUP) { 1343 sz = sample->read.group.nr * 1344 sizeof(struct sample_read_value); 1345 result += sz; 1346 } else { 1347 result += sizeof(u64); 1348 } 1349 } 1350 1351 if (type & PERF_SAMPLE_CALLCHAIN) { 1352 sz = (sample->callchain->nr + 1) * sizeof(u64); 1353 result += sz; 1354 } 1355 1356 if (type & PERF_SAMPLE_RAW) { 1357 result += sizeof(u32); 1358 result += sample->raw_size; 1359 } 1360 1361 if (type & PERF_SAMPLE_BRANCH_STACK) { 1362 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1363 /* nr, hw_idx */ 1364 sz += 2 * sizeof(u64); 1365 result += sz; 1366 } 1367 1368 if (type & PERF_SAMPLE_REGS_USER) { 1369 if (sample->user_regs.abi) { 1370 result += sizeof(u64); 1371 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1372 result += sz; 1373 } else { 1374 result += sizeof(u64); 1375 } 1376 } 1377 1378 if (type & PERF_SAMPLE_STACK_USER) { 1379 sz = sample->user_stack.size; 1380 result += sizeof(u64); 1381 if (sz) { 1382 result += sz; 1383 result += sizeof(u64); 1384 } 1385 } 1386 1387 if (type & PERF_SAMPLE_WEIGHT) 1388 result += sizeof(u64); 1389 1390 if (type & PERF_SAMPLE_DATA_SRC) 1391 result += sizeof(u64); 1392 1393 if (type & PERF_SAMPLE_TRANSACTION) 1394 result += sizeof(u64); 1395 1396 if (type & PERF_SAMPLE_REGS_INTR) { 1397 if (sample->intr_regs.abi) { 1398 result += sizeof(u64); 1399 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1400 result += sz; 1401 } else { 1402 result += sizeof(u64); 1403 } 1404 } 1405 1406 if (type & PERF_SAMPLE_PHYS_ADDR) 1407 result += sizeof(u64); 1408 1409 if (type & PERF_SAMPLE_CGROUP) 1410 result += sizeof(u64); 1411 1412 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) 1413 result += sizeof(u64); 1414 1415 if (type & PERF_SAMPLE_AUX) { 1416 result += sizeof(u64); 1417 result += sample->aux_sample.size; 1418 } 1419 1420 return result; 1421 } 1422 1423 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1424 const struct perf_sample *sample) 1425 { 1426 __u64 *array; 1427 size_t sz; 1428 /* 1429 * used for cross-endian analysis. See git commit 65014ab3 1430 * for why this goofiness is needed. 1431 */ 1432 union u64_swap u; 1433 1434 array = event->sample.array; 1435 1436 if (type & PERF_SAMPLE_IDENTIFIER) { 1437 *array = sample->id; 1438 array++; 1439 } 1440 1441 if (type & PERF_SAMPLE_IP) { 1442 *array = sample->ip; 1443 array++; 1444 } 1445 1446 if (type & PERF_SAMPLE_TID) { 1447 u.val32[0] = sample->pid; 1448 u.val32[1] = sample->tid; 1449 *array = u.val64; 1450 array++; 1451 } 1452 1453 if (type & PERF_SAMPLE_TIME) { 1454 *array = sample->time; 1455 array++; 1456 } 1457 1458 if (type & PERF_SAMPLE_ADDR) { 1459 *array = sample->addr; 1460 array++; 1461 } 1462 1463 if (type & PERF_SAMPLE_ID) { 1464 *array = sample->id; 1465 array++; 1466 } 1467 1468 if (type & PERF_SAMPLE_STREAM_ID) { 1469 *array = sample->stream_id; 1470 array++; 1471 } 1472 1473 if (type & PERF_SAMPLE_CPU) { 1474 u.val32[0] = sample->cpu; 1475 u.val32[1] = 0; 1476 *array = u.val64; 1477 array++; 1478 } 1479 1480 if (type & PERF_SAMPLE_PERIOD) { 1481 *array = sample->period; 1482 array++; 1483 } 1484 1485 if (type & PERF_SAMPLE_READ) { 1486 if (read_format & PERF_FORMAT_GROUP) 1487 *array = sample->read.group.nr; 1488 else 1489 *array = sample->read.one.value; 1490 array++; 1491 1492 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1493 *array = sample->read.time_enabled; 1494 array++; 1495 } 1496 1497 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1498 *array = sample->read.time_running; 1499 array++; 1500 } 1501 1502 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1503 if (read_format & PERF_FORMAT_GROUP) { 1504 sz = sample->read.group.nr * 1505 sizeof(struct sample_read_value); 1506 memcpy(array, sample->read.group.values, sz); 1507 array = (void *)array + sz; 1508 } else { 1509 *array = sample->read.one.id; 1510 array++; 1511 } 1512 } 1513 1514 if (type & PERF_SAMPLE_CALLCHAIN) { 1515 sz = (sample->callchain->nr + 1) * sizeof(u64); 1516 memcpy(array, sample->callchain, sz); 1517 array = (void *)array + sz; 1518 } 1519 1520 if (type & PERF_SAMPLE_RAW) { 1521 u.val32[0] = sample->raw_size; 1522 *array = u.val64; 1523 array = (void *)array + sizeof(u32); 1524 1525 memcpy(array, sample->raw_data, sample->raw_size); 1526 array = (void *)array + sample->raw_size; 1527 } 1528 1529 if (type & PERF_SAMPLE_BRANCH_STACK) { 1530 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1531 /* nr, hw_idx */ 1532 sz += 2 * sizeof(u64); 1533 memcpy(array, sample->branch_stack, sz); 1534 array = (void *)array + sz; 1535 } 1536 1537 if (type & PERF_SAMPLE_REGS_USER) { 1538 if (sample->user_regs.abi) { 1539 *array++ = sample->user_regs.abi; 1540 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1541 memcpy(array, sample->user_regs.regs, sz); 1542 array = (void *)array + sz; 1543 } else { 1544 *array++ = 0; 1545 } 1546 } 1547 1548 if (type & PERF_SAMPLE_STACK_USER) { 1549 sz = sample->user_stack.size; 1550 *array++ = sz; 1551 if (sz) { 1552 memcpy(array, sample->user_stack.data, sz); 1553 array = (void *)array + sz; 1554 *array++ = sz; 1555 } 1556 } 1557 1558 if (type & PERF_SAMPLE_WEIGHT) { 1559 *array = sample->weight; 1560 array++; 1561 } 1562 1563 if (type & PERF_SAMPLE_DATA_SRC) { 1564 *array = sample->data_src; 1565 array++; 1566 } 1567 1568 if (type & PERF_SAMPLE_TRANSACTION) { 1569 *array = sample->transaction; 1570 array++; 1571 } 1572 1573 if (type & PERF_SAMPLE_REGS_INTR) { 1574 if (sample->intr_regs.abi) { 1575 *array++ = sample->intr_regs.abi; 1576 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1577 memcpy(array, sample->intr_regs.regs, sz); 1578 array = (void *)array + sz; 1579 } else { 1580 *array++ = 0; 1581 } 1582 } 1583 1584 if (type & PERF_SAMPLE_PHYS_ADDR) { 1585 *array = sample->phys_addr; 1586 array++; 1587 } 1588 1589 if (type & PERF_SAMPLE_CGROUP) { 1590 *array = sample->cgroup; 1591 array++; 1592 } 1593 1594 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 1595 *array = sample->data_page_size; 1596 array++; 1597 } 1598 1599 if (type & PERF_SAMPLE_AUX) { 1600 sz = sample->aux_sample.size; 1601 *array++ = sz; 1602 memcpy(array, sample->aux_sample.data, sz); 1603 array = (void *)array + sz; 1604 } 1605 1606 return 0; 1607 } 1608 1609 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1610 struct evlist *evlist, struct machine *machine) 1611 { 1612 union perf_event *ev; 1613 struct evsel *evsel; 1614 size_t nr = 0, i = 0, sz, max_nr, n; 1615 int err; 1616 1617 pr_debug2("Synthesizing id index\n"); 1618 1619 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / 1620 sizeof(struct id_index_entry); 1621 1622 evlist__for_each_entry(evlist, evsel) 1623 nr += evsel->core.ids; 1624 1625 n = nr > max_nr ? max_nr : nr; 1626 sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry); 1627 ev = zalloc(sz); 1628 if (!ev) 1629 return -ENOMEM; 1630 1631 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1632 ev->id_index.header.size = sz; 1633 ev->id_index.nr = n; 1634 1635 evlist__for_each_entry(evlist, evsel) { 1636 u32 j; 1637 1638 for (j = 0; j < evsel->core.ids; j++) { 1639 struct id_index_entry *e; 1640 struct perf_sample_id *sid; 1641 1642 if (i >= n) { 1643 err = process(tool, ev, NULL, machine); 1644 if (err) 1645 goto out_err; 1646 nr -= n; 1647 i = 0; 1648 } 1649 1650 e = &ev->id_index.entries[i++]; 1651 1652 e->id = evsel->core.id[j]; 1653 1654 sid = evlist__id2sid(evlist, e->id); 1655 if (!sid) { 1656 free(ev); 1657 return -ENOENT; 1658 } 1659 1660 e->idx = sid->idx; 1661 e->cpu = sid->cpu; 1662 e->tid = sid->tid; 1663 } 1664 } 1665 1666 sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry); 1667 ev->id_index.header.size = sz; 1668 ev->id_index.nr = nr; 1669 1670 err = process(tool, ev, NULL, machine); 1671 out_err: 1672 free(ev); 1673 1674 return err; 1675 } 1676 1677 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1678 struct target *target, struct perf_thread_map *threads, 1679 perf_event__handler_t process, bool data_mmap, 1680 unsigned int nr_threads_synthesize) 1681 { 1682 if (target__has_task(target)) 1683 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); 1684 else if (target__has_cpu(target)) 1685 return perf_event__synthesize_threads(tool, process, 1686 machine, data_mmap, 1687 nr_threads_synthesize); 1688 /* command specified */ 1689 return 0; 1690 } 1691 1692 int machine__synthesize_threads(struct machine *machine, struct target *target, 1693 struct perf_thread_map *threads, bool data_mmap, 1694 unsigned int nr_threads_synthesize) 1695 { 1696 return __machine__synthesize_threads(machine, NULL, target, threads, 1697 perf_event__process, data_mmap, 1698 nr_threads_synthesize); 1699 } 1700 1701 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1702 { 1703 struct perf_record_event_update *ev; 1704 1705 size += sizeof(*ev); 1706 size = PERF_ALIGN(size, sizeof(u64)); 1707 1708 ev = zalloc(size); 1709 if (ev) { 1710 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1711 ev->header.size = (u16)size; 1712 ev->type = type; 1713 ev->id = id; 1714 } 1715 return ev; 1716 } 1717 1718 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1719 perf_event__handler_t process) 1720 { 1721 size_t size = strlen(evsel->unit); 1722 struct perf_record_event_update *ev; 1723 int err; 1724 1725 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1726 if (ev == NULL) 1727 return -ENOMEM; 1728 1729 strlcpy(ev->data, evsel->unit, size + 1); 1730 err = process(tool, (union perf_event *)ev, NULL, NULL); 1731 free(ev); 1732 return err; 1733 } 1734 1735 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 1736 perf_event__handler_t process) 1737 { 1738 struct perf_record_event_update *ev; 1739 struct perf_record_event_update_scale *ev_data; 1740 int err; 1741 1742 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 1743 if (ev == NULL) 1744 return -ENOMEM; 1745 1746 ev_data = (struct perf_record_event_update_scale *)ev->data; 1747 ev_data->scale = evsel->scale; 1748 err = process(tool, (union perf_event *)ev, NULL, NULL); 1749 free(ev); 1750 return err; 1751 } 1752 1753 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 1754 perf_event__handler_t process) 1755 { 1756 struct perf_record_event_update *ev; 1757 size_t len = strlen(evsel->name); 1758 int err; 1759 1760 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 1761 if (ev == NULL) 1762 return -ENOMEM; 1763 1764 strlcpy(ev->data, evsel->name, len + 1); 1765 err = process(tool, (union perf_event *)ev, NULL, NULL); 1766 free(ev); 1767 return err; 1768 } 1769 1770 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 1771 perf_event__handler_t process) 1772 { 1773 size_t size = sizeof(struct perf_record_event_update); 1774 struct perf_record_event_update *ev; 1775 int max, err; 1776 u16 type; 1777 1778 if (!evsel->core.own_cpus) 1779 return 0; 1780 1781 ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max); 1782 if (!ev) 1783 return -ENOMEM; 1784 1785 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1786 ev->header.size = (u16)size; 1787 ev->type = PERF_EVENT_UPDATE__CPUS; 1788 ev->id = evsel->core.id[0]; 1789 1790 cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data, 1791 evsel->core.own_cpus, type, max); 1792 1793 err = process(tool, (union perf_event *)ev, NULL, NULL); 1794 free(ev); 1795 return err; 1796 } 1797 1798 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 1799 perf_event__handler_t process) 1800 { 1801 struct evsel *evsel; 1802 int err = 0; 1803 1804 evlist__for_each_entry(evlist, evsel) { 1805 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 1806 evsel->core.id, process); 1807 if (err) { 1808 pr_debug("failed to create perf header attribute\n"); 1809 return err; 1810 } 1811 } 1812 1813 return err; 1814 } 1815 1816 static bool has_unit(struct evsel *evsel) 1817 { 1818 return evsel->unit && *evsel->unit; 1819 } 1820 1821 static bool has_scale(struct evsel *evsel) 1822 { 1823 return evsel->scale != 1; 1824 } 1825 1826 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 1827 perf_event__handler_t process, bool is_pipe) 1828 { 1829 struct evsel *evsel; 1830 int err; 1831 1832 /* 1833 * Synthesize other events stuff not carried within 1834 * attr event - unit, scale, name 1835 */ 1836 evlist__for_each_entry(evsel_list, evsel) { 1837 if (!evsel->supported) 1838 continue; 1839 1840 /* 1841 * Synthesize unit and scale only if it's defined. 1842 */ 1843 if (has_unit(evsel)) { 1844 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 1845 if (err < 0) { 1846 pr_err("Couldn't synthesize evsel unit.\n"); 1847 return err; 1848 } 1849 } 1850 1851 if (has_scale(evsel)) { 1852 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 1853 if (err < 0) { 1854 pr_err("Couldn't synthesize evsel evsel.\n"); 1855 return err; 1856 } 1857 } 1858 1859 if (evsel->core.own_cpus) { 1860 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 1861 if (err < 0) { 1862 pr_err("Couldn't synthesize evsel cpus.\n"); 1863 return err; 1864 } 1865 } 1866 1867 /* 1868 * Name is needed only for pipe output, 1869 * perf.data carries event names. 1870 */ 1871 if (is_pipe) { 1872 err = perf_event__synthesize_event_update_name(tool, evsel, process); 1873 if (err < 0) { 1874 pr_err("Couldn't synthesize evsel name.\n"); 1875 return err; 1876 } 1877 } 1878 } 1879 return 0; 1880 } 1881 1882 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 1883 u32 ids, u64 *id, perf_event__handler_t process) 1884 { 1885 union perf_event *ev; 1886 size_t size; 1887 int err; 1888 1889 size = sizeof(struct perf_event_attr); 1890 size = PERF_ALIGN(size, sizeof(u64)); 1891 size += sizeof(struct perf_event_header); 1892 size += ids * sizeof(u64); 1893 1894 ev = zalloc(size); 1895 1896 if (ev == NULL) 1897 return -ENOMEM; 1898 1899 ev->attr.attr = *attr; 1900 memcpy(ev->attr.id, id, ids * sizeof(u64)); 1901 1902 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 1903 ev->attr.header.size = (u16)size; 1904 1905 if (ev->attr.header.size == size) 1906 err = process(tool, ev, NULL, NULL); 1907 else 1908 err = -E2BIG; 1909 1910 free(ev); 1911 1912 return err; 1913 } 1914 1915 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 1916 perf_event__handler_t process) 1917 { 1918 union perf_event ev; 1919 struct tracing_data *tdata; 1920 ssize_t size = 0, aligned_size = 0, padding; 1921 struct feat_fd ff; 1922 1923 /* 1924 * We are going to store the size of the data followed 1925 * by the data contents. Since the fd descriptor is a pipe, 1926 * we cannot seek back to store the size of the data once 1927 * we know it. Instead we: 1928 * 1929 * - write the tracing data to the temp file 1930 * - get/write the data size to pipe 1931 * - write the tracing data from the temp file 1932 * to the pipe 1933 */ 1934 tdata = tracing_data_get(&evlist->core.entries, fd, true); 1935 if (!tdata) 1936 return -1; 1937 1938 memset(&ev, 0, sizeof(ev)); 1939 1940 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 1941 size = tdata->size; 1942 aligned_size = PERF_ALIGN(size, sizeof(u64)); 1943 padding = aligned_size - size; 1944 ev.tracing_data.header.size = sizeof(ev.tracing_data); 1945 ev.tracing_data.size = aligned_size; 1946 1947 process(tool, &ev, NULL, NULL); 1948 1949 /* 1950 * The put function will copy all the tracing data 1951 * stored in temp file to the pipe. 1952 */ 1953 tracing_data_put(tdata); 1954 1955 ff = (struct feat_fd){ .fd = fd }; 1956 if (write_padded(&ff, NULL, 0, padding)) 1957 return -1; 1958 1959 return aligned_size; 1960 } 1961 1962 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 1963 perf_event__handler_t process, struct machine *machine) 1964 { 1965 union perf_event ev; 1966 size_t len; 1967 1968 if (!pos->hit) 1969 return 0; 1970 1971 memset(&ev, 0, sizeof(ev)); 1972 1973 len = pos->long_name_len + 1; 1974 len = PERF_ALIGN(len, NAME_ALIGN); 1975 memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data)); 1976 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 1977 ev.build_id.header.misc = misc; 1978 ev.build_id.pid = machine->pid; 1979 ev.build_id.header.size = sizeof(ev.build_id) + len; 1980 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 1981 1982 return process(tool, &ev, NULL, machine); 1983 } 1984 1985 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 1986 struct evlist *evlist, perf_event__handler_t process, bool attrs) 1987 { 1988 int err; 1989 1990 if (attrs) { 1991 err = perf_event__synthesize_attrs(tool, evlist, process); 1992 if (err < 0) { 1993 pr_err("Couldn't synthesize attrs.\n"); 1994 return err; 1995 } 1996 } 1997 1998 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 1999 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 2000 if (err < 0) { 2001 pr_err("Couldn't synthesize thread map.\n"); 2002 return err; 2003 } 2004 2005 err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL); 2006 if (err < 0) { 2007 pr_err("Couldn't synthesize thread map.\n"); 2008 return err; 2009 } 2010 2011 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 2012 if (err < 0) { 2013 pr_err("Couldn't synthesize config.\n"); 2014 return err; 2015 } 2016 2017 return 0; 2018 } 2019 2020 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 2021 2022 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 2023 struct evlist *evlist, perf_event__handler_t process) 2024 { 2025 struct perf_header *header = &session->header; 2026 struct perf_record_header_feature *fe; 2027 struct feat_fd ff; 2028 size_t sz, sz_hdr; 2029 int feat, ret; 2030 2031 sz_hdr = sizeof(fe->header); 2032 sz = sizeof(union perf_event); 2033 /* get a nice alignment */ 2034 sz = PERF_ALIGN(sz, page_size); 2035 2036 memset(&ff, 0, sizeof(ff)); 2037 2038 ff.buf = malloc(sz); 2039 if (!ff.buf) 2040 return -ENOMEM; 2041 2042 ff.size = sz - sz_hdr; 2043 ff.ph = &session->header; 2044 2045 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 2046 if (!feat_ops[feat].synthesize) { 2047 pr_debug("No record header feature for header :%d\n", feat); 2048 continue; 2049 } 2050 2051 ff.offset = sizeof(*fe); 2052 2053 ret = feat_ops[feat].write(&ff, evlist); 2054 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2055 pr_debug("Error writing feature\n"); 2056 continue; 2057 } 2058 /* ff.buf may have changed due to realloc in do_write() */ 2059 fe = ff.buf; 2060 memset(fe, 0, sizeof(*fe)); 2061 2062 fe->feat_id = feat; 2063 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2064 fe->header.size = ff.offset; 2065 2066 ret = process(tool, ff.buf, NULL, NULL); 2067 if (ret) { 2068 free(ff.buf); 2069 return ret; 2070 } 2071 } 2072 2073 /* Send HEADER_LAST_FEATURE mark. */ 2074 fe = ff.buf; 2075 fe->feat_id = HEADER_LAST_FEATURE; 2076 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2077 fe->header.size = sizeof(*fe); 2078 2079 ret = process(tool, ff.buf, NULL, NULL); 2080 2081 free(ff.buf); 2082 return ret; 2083 } 2084