1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include "util/cgroup.h" 4 #include "util/data.h" 5 #include "util/debug.h" 6 #include "util/dso.h" 7 #include "util/event.h" 8 #include "util/evlist.h" 9 #include "util/machine.h" 10 #include "util/map.h" 11 #include "util/map_symbol.h" 12 #include "util/branch.h" 13 #include "util/memswap.h" 14 #include "util/namespaces.h" 15 #include "util/session.h" 16 #include "util/stat.h" 17 #include "util/symbol.h" 18 #include "util/synthetic-events.h" 19 #include "util/target.h" 20 #include "util/time-utils.h" 21 #include <linux/bitops.h> 22 #include <linux/kernel.h> 23 #include <linux/string.h> 24 #include <linux/zalloc.h> 25 #include <linux/perf_event.h> 26 #include <asm/bug.h> 27 #include <perf/evsel.h> 28 #include <perf/cpumap.h> 29 #include <internal/lib.h> // page_size 30 #include <internal/threadmap.h> 31 #include <perf/threadmap.h> 32 #include <symbol/kallsyms.h> 33 #include <dirent.h> 34 #include <errno.h> 35 #include <inttypes.h> 36 #include <stdio.h> 37 #include <string.h> 38 #include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */ 39 #include <api/fs/fs.h> 40 #include <api/io.h> 41 #include <sys/types.h> 42 #include <sys/stat.h> 43 #include <fcntl.h> 44 #include <unistd.h> 45 46 #define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500 47 48 unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT; 49 50 int perf_tool__process_synth_event(struct perf_tool *tool, 51 union perf_event *event, 52 struct machine *machine, 53 perf_event__handler_t process) 54 { 55 struct perf_sample synth_sample = { 56 .pid = -1, 57 .tid = -1, 58 .time = -1, 59 .stream_id = -1, 60 .cpu = -1, 61 .period = 1, 62 .cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK, 63 }; 64 65 return process(tool, event, &synth_sample, machine); 66 }; 67 68 /* 69 * Assumes that the first 4095 bytes of /proc/pid/stat contains 70 * the comm, tgid and ppid. 71 */ 72 static int perf_event__get_comm_ids(pid_t pid, pid_t tid, char *comm, size_t len, 73 pid_t *tgid, pid_t *ppid, bool *kernel) 74 { 75 char bf[4096]; 76 int fd; 77 size_t size = 0; 78 ssize_t n; 79 char *name, *tgids, *ppids, *vmpeak, *threads; 80 81 *tgid = -1; 82 *ppid = -1; 83 84 if (pid) 85 snprintf(bf, sizeof(bf), "/proc/%d/task/%d/status", pid, tid); 86 else 87 snprintf(bf, sizeof(bf), "/proc/%d/status", tid); 88 89 fd = open(bf, O_RDONLY); 90 if (fd < 0) { 91 pr_debug("couldn't open %s\n", bf); 92 return -1; 93 } 94 95 n = read(fd, bf, sizeof(bf) - 1); 96 close(fd); 97 if (n <= 0) { 98 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n", 99 tid); 100 return -1; 101 } 102 bf[n] = '\0'; 103 104 name = strstr(bf, "Name:"); 105 tgids = strstr(name ?: bf, "Tgid:"); 106 ppids = strstr(tgids ?: bf, "PPid:"); 107 vmpeak = strstr(ppids ?: bf, "VmPeak:"); 108 109 if (vmpeak) 110 threads = NULL; 111 else 112 threads = strstr(ppids ?: bf, "Threads:"); 113 114 if (name) { 115 char *nl; 116 117 name = skip_spaces(name + 5); /* strlen("Name:") */ 118 nl = strchr(name, '\n'); 119 if (nl) 120 *nl = '\0'; 121 122 size = strlen(name); 123 if (size >= len) 124 size = len - 1; 125 memcpy(comm, name, size); 126 comm[size] = '\0'; 127 } else { 128 pr_debug("Name: string not found for pid %d\n", tid); 129 } 130 131 if (tgids) { 132 tgids += 5; /* strlen("Tgid:") */ 133 *tgid = atoi(tgids); 134 } else { 135 pr_debug("Tgid: string not found for pid %d\n", tid); 136 } 137 138 if (ppids) { 139 ppids += 5; /* strlen("PPid:") */ 140 *ppid = atoi(ppids); 141 } else { 142 pr_debug("PPid: string not found for pid %d\n", tid); 143 } 144 145 if (!vmpeak && threads) 146 *kernel = true; 147 else 148 *kernel = false; 149 150 return 0; 151 } 152 153 static int perf_event__prepare_comm(union perf_event *event, pid_t pid, pid_t tid, 154 struct machine *machine, 155 pid_t *tgid, pid_t *ppid, bool *kernel) 156 { 157 size_t size; 158 159 *ppid = -1; 160 161 memset(&event->comm, 0, sizeof(event->comm)); 162 163 if (machine__is_host(machine)) { 164 if (perf_event__get_comm_ids(pid, tid, event->comm.comm, 165 sizeof(event->comm.comm), 166 tgid, ppid, kernel) != 0) { 167 return -1; 168 } 169 } else { 170 *tgid = machine->pid; 171 } 172 173 if (*tgid < 0) 174 return -1; 175 176 event->comm.pid = *tgid; 177 event->comm.header.type = PERF_RECORD_COMM; 178 179 size = strlen(event->comm.comm) + 1; 180 size = PERF_ALIGN(size, sizeof(u64)); 181 memset(event->comm.comm + size, 0, machine->id_hdr_size); 182 event->comm.header.size = (sizeof(event->comm) - 183 (sizeof(event->comm.comm) - size) + 184 machine->id_hdr_size); 185 event->comm.tid = tid; 186 187 return 0; 188 } 189 190 pid_t perf_event__synthesize_comm(struct perf_tool *tool, 191 union perf_event *event, pid_t pid, 192 perf_event__handler_t process, 193 struct machine *machine) 194 { 195 pid_t tgid, ppid; 196 bool kernel_thread; 197 198 if (perf_event__prepare_comm(event, 0, pid, machine, &tgid, &ppid, 199 &kernel_thread) != 0) 200 return -1; 201 202 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 203 return -1; 204 205 return tgid; 206 } 207 208 static void perf_event__get_ns_link_info(pid_t pid, const char *ns, 209 struct perf_ns_link_info *ns_link_info) 210 { 211 struct stat64 st; 212 char proc_ns[128]; 213 214 sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns); 215 if (stat64(proc_ns, &st) == 0) { 216 ns_link_info->dev = st.st_dev; 217 ns_link_info->ino = st.st_ino; 218 } 219 } 220 221 int perf_event__synthesize_namespaces(struct perf_tool *tool, 222 union perf_event *event, 223 pid_t pid, pid_t tgid, 224 perf_event__handler_t process, 225 struct machine *machine) 226 { 227 u32 idx; 228 struct perf_ns_link_info *ns_link_info; 229 230 if (!tool || !tool->namespace_events) 231 return 0; 232 233 memset(&event->namespaces, 0, (sizeof(event->namespaces) + 234 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 235 machine->id_hdr_size)); 236 237 event->namespaces.pid = tgid; 238 event->namespaces.tid = pid; 239 240 event->namespaces.nr_namespaces = NR_NAMESPACES; 241 242 ns_link_info = event->namespaces.link_info; 243 244 for (idx = 0; idx < event->namespaces.nr_namespaces; idx++) 245 perf_event__get_ns_link_info(pid, perf_ns__name(idx), 246 &ns_link_info[idx]); 247 248 event->namespaces.header.type = PERF_RECORD_NAMESPACES; 249 250 event->namespaces.header.size = (sizeof(event->namespaces) + 251 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 252 machine->id_hdr_size); 253 254 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 255 return -1; 256 257 return 0; 258 } 259 260 static int perf_event__synthesize_fork(struct perf_tool *tool, 261 union perf_event *event, 262 pid_t pid, pid_t tgid, pid_t ppid, 263 perf_event__handler_t process, 264 struct machine *machine) 265 { 266 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size); 267 268 /* 269 * for main thread set parent to ppid from status file. For other 270 * threads set parent pid to main thread. ie., assume main thread 271 * spawns all threads in a process 272 */ 273 if (tgid == pid) { 274 event->fork.ppid = ppid; 275 event->fork.ptid = ppid; 276 } else { 277 event->fork.ppid = tgid; 278 event->fork.ptid = tgid; 279 } 280 event->fork.pid = tgid; 281 event->fork.tid = pid; 282 event->fork.header.type = PERF_RECORD_FORK; 283 event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC; 284 285 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size); 286 287 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 288 return -1; 289 290 return 0; 291 } 292 293 static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end, 294 u32 *prot, u32 *flags, __u64 *offset, 295 u32 *maj, u32 *min, 296 __u64 *inode, 297 ssize_t pathname_size, char *pathname) 298 { 299 __u64 temp; 300 int ch; 301 char *start_pathname = pathname; 302 303 if (io__get_hex(io, start) != '-') 304 return false; 305 if (io__get_hex(io, end) != ' ') 306 return false; 307 308 /* map protection and flags bits */ 309 *prot = 0; 310 ch = io__get_char(io); 311 if (ch == 'r') 312 *prot |= PROT_READ; 313 else if (ch != '-') 314 return false; 315 ch = io__get_char(io); 316 if (ch == 'w') 317 *prot |= PROT_WRITE; 318 else if (ch != '-') 319 return false; 320 ch = io__get_char(io); 321 if (ch == 'x') 322 *prot |= PROT_EXEC; 323 else if (ch != '-') 324 return false; 325 ch = io__get_char(io); 326 if (ch == 's') 327 *flags = MAP_SHARED; 328 else if (ch == 'p') 329 *flags = MAP_PRIVATE; 330 else 331 return false; 332 if (io__get_char(io) != ' ') 333 return false; 334 335 if (io__get_hex(io, offset) != ' ') 336 return false; 337 338 if (io__get_hex(io, &temp) != ':') 339 return false; 340 *maj = temp; 341 if (io__get_hex(io, &temp) != ' ') 342 return false; 343 *min = temp; 344 345 ch = io__get_dec(io, inode); 346 if (ch != ' ') { 347 *pathname = '\0'; 348 return ch == '\n'; 349 } 350 do { 351 ch = io__get_char(io); 352 } while (ch == ' '); 353 while (true) { 354 if (ch < 0) 355 return false; 356 if (ch == '\0' || ch == '\n' || 357 (pathname + 1 - start_pathname) >= pathname_size) { 358 *pathname = '\0'; 359 return true; 360 } 361 *pathname++ = ch; 362 ch = io__get_char(io); 363 } 364 } 365 366 static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event, 367 bool is_kernel) 368 { 369 struct build_id bid; 370 int rc; 371 372 if (is_kernel) 373 rc = sysfs__read_build_id("/sys/kernel/notes", &bid); 374 else 375 rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1; 376 377 if (rc == 0) { 378 memcpy(event->build_id, bid.data, sizeof(bid.data)); 379 event->build_id_size = (u8) bid.size; 380 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID; 381 event->__reserved_1 = 0; 382 event->__reserved_2 = 0; 383 } else { 384 if (event->filename[0] == '/') { 385 pr_debug2("Failed to read build ID for %s\n", 386 event->filename); 387 } 388 } 389 } 390 391 int perf_event__synthesize_mmap_events(struct perf_tool *tool, 392 union perf_event *event, 393 pid_t pid, pid_t tgid, 394 perf_event__handler_t process, 395 struct machine *machine, 396 bool mmap_data) 397 { 398 unsigned long long t; 399 char bf[BUFSIZ]; 400 struct io io; 401 bool truncation = false; 402 unsigned long long timeout = proc_map_timeout * 1000000ULL; 403 int rc = 0; 404 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 405 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 406 407 if (machine__is_default_guest(machine)) 408 return 0; 409 410 snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps", 411 machine->root_dir, pid, pid); 412 413 io.fd = open(bf, O_RDONLY, 0); 414 if (io.fd < 0) { 415 /* 416 * We raced with a task exiting - just return: 417 */ 418 pr_debug("couldn't open %s\n", bf); 419 return -1; 420 } 421 io__init(&io, io.fd, bf, sizeof(bf)); 422 423 event->header.type = PERF_RECORD_MMAP2; 424 t = rdclock(); 425 426 while (!io.eof) { 427 static const char anonstr[] = "//anon"; 428 size_t size, aligned_size; 429 430 /* ensure null termination since stack will be reused. */ 431 event->mmap2.filename[0] = '\0'; 432 433 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 434 if (!read_proc_maps_line(&io, 435 &event->mmap2.start, 436 &event->mmap2.len, 437 &event->mmap2.prot, 438 &event->mmap2.flags, 439 &event->mmap2.pgoff, 440 &event->mmap2.maj, 441 &event->mmap2.min, 442 &event->mmap2.ino, 443 sizeof(event->mmap2.filename), 444 event->mmap2.filename)) 445 continue; 446 447 if ((rdclock() - t) > timeout) { 448 pr_warning("Reading %s/proc/%d/task/%d/maps time out. " 449 "You may want to increase " 450 "the time limit by --proc-map-timeout\n", 451 machine->root_dir, pid, pid); 452 truncation = true; 453 goto out; 454 } 455 456 event->mmap2.ino_generation = 0; 457 458 /* 459 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 460 */ 461 if (machine__is_host(machine)) 462 event->header.misc = PERF_RECORD_MISC_USER; 463 else 464 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 465 466 if ((event->mmap2.prot & PROT_EXEC) == 0) { 467 if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0) 468 continue; 469 470 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 471 } 472 473 out: 474 if (truncation) 475 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 476 477 if (!strcmp(event->mmap2.filename, "")) 478 strcpy(event->mmap2.filename, anonstr); 479 480 if (hugetlbfs_mnt_len && 481 !strncmp(event->mmap2.filename, hugetlbfs_mnt, 482 hugetlbfs_mnt_len)) { 483 strcpy(event->mmap2.filename, anonstr); 484 event->mmap2.flags |= MAP_HUGETLB; 485 } 486 487 size = strlen(event->mmap2.filename) + 1; 488 aligned_size = PERF_ALIGN(size, sizeof(u64)); 489 event->mmap2.len -= event->mmap.start; 490 event->mmap2.header.size = (sizeof(event->mmap2) - 491 (sizeof(event->mmap2.filename) - aligned_size)); 492 memset(event->mmap2.filename + size, 0, machine->id_hdr_size + 493 (aligned_size - size)); 494 event->mmap2.header.size += machine->id_hdr_size; 495 event->mmap2.pid = tgid; 496 event->mmap2.tid = pid; 497 498 if (symbol_conf.buildid_mmap2) 499 perf_record_mmap2__read_build_id(&event->mmap2, false); 500 501 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 502 rc = -1; 503 break; 504 } 505 506 if (truncation) 507 break; 508 } 509 510 close(io.fd); 511 return rc; 512 } 513 514 #ifdef HAVE_FILE_HANDLE 515 static int perf_event__synthesize_cgroup(struct perf_tool *tool, 516 union perf_event *event, 517 char *path, size_t mount_len, 518 perf_event__handler_t process, 519 struct machine *machine) 520 { 521 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 522 size_t path_len = strlen(path) - mount_len + 1; 523 struct { 524 struct file_handle fh; 525 uint64_t cgroup_id; 526 } handle; 527 int mount_id; 528 529 while (path_len % sizeof(u64)) 530 path[mount_len + path_len++] = '\0'; 531 532 memset(&event->cgroup, 0, event_size); 533 534 event->cgroup.header.type = PERF_RECORD_CGROUP; 535 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 536 537 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 538 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 539 pr_debug("stat failed: %s\n", path); 540 return -1; 541 } 542 543 event->cgroup.id = handle.cgroup_id; 544 strncpy(event->cgroup.path, path + mount_len, path_len); 545 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 546 547 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 548 pr_debug("process synth event failed\n"); 549 return -1; 550 } 551 552 return 0; 553 } 554 555 static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 556 union perf_event *event, 557 char *path, size_t mount_len, 558 perf_event__handler_t process, 559 struct machine *machine) 560 { 561 size_t pos = strlen(path); 562 DIR *d; 563 struct dirent *dent; 564 int ret = 0; 565 566 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 567 process, machine) < 0) 568 return -1; 569 570 d = opendir(path); 571 if (d == NULL) { 572 pr_debug("failed to open directory: %s\n", path); 573 return -1; 574 } 575 576 while ((dent = readdir(d)) != NULL) { 577 if (dent->d_type != DT_DIR) 578 continue; 579 if (!strcmp(dent->d_name, ".") || 580 !strcmp(dent->d_name, "..")) 581 continue; 582 583 /* any sane path should be less than PATH_MAX */ 584 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 585 continue; 586 587 if (path[pos - 1] != '/') 588 strcat(path, "/"); 589 strcat(path, dent->d_name); 590 591 ret = perf_event__walk_cgroup_tree(tool, event, path, 592 mount_len, process, machine); 593 if (ret < 0) 594 break; 595 596 path[pos] = '\0'; 597 } 598 599 closedir(d); 600 return ret; 601 } 602 603 int perf_event__synthesize_cgroups(struct perf_tool *tool, 604 perf_event__handler_t process, 605 struct machine *machine) 606 { 607 union perf_event event; 608 char cgrp_root[PATH_MAX]; 609 size_t mount_len; /* length of mount point in the path */ 610 611 if (!tool || !tool->cgroup_events) 612 return 0; 613 614 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 615 pr_debug("cannot find cgroup mount point\n"); 616 return -1; 617 } 618 619 mount_len = strlen(cgrp_root); 620 /* make sure the path starts with a slash (after mount point) */ 621 strcat(cgrp_root, "/"); 622 623 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 624 process, machine) < 0) 625 return -1; 626 627 return 0; 628 } 629 #else 630 int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 631 perf_event__handler_t process __maybe_unused, 632 struct machine *machine __maybe_unused) 633 { 634 return -1; 635 } 636 #endif 637 638 int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 639 struct machine *machine) 640 { 641 int rc = 0; 642 struct map *pos; 643 struct maps *maps = machine__kernel_maps(machine); 644 union perf_event *event; 645 size_t size = symbol_conf.buildid_mmap2 ? 646 sizeof(event->mmap2) : sizeof(event->mmap); 647 648 event = zalloc(size + machine->id_hdr_size); 649 if (event == NULL) { 650 pr_debug("Not enough memory synthesizing mmap event " 651 "for kernel modules\n"); 652 return -1; 653 } 654 655 /* 656 * kernel uses 0 for user space maps, see kernel/perf_event.c 657 * __perf_event_mmap 658 */ 659 if (machine__is_host(machine)) 660 event->header.misc = PERF_RECORD_MISC_KERNEL; 661 else 662 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 663 664 maps__for_each_entry(maps, pos) { 665 if (!__map__is_kmodule(pos)) 666 continue; 667 668 if (symbol_conf.buildid_mmap2) { 669 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 670 event->mmap2.header.type = PERF_RECORD_MMAP2; 671 event->mmap2.header.size = (sizeof(event->mmap2) - 672 (sizeof(event->mmap2.filename) - size)); 673 memset(event->mmap2.filename + size, 0, machine->id_hdr_size); 674 event->mmap2.header.size += machine->id_hdr_size; 675 event->mmap2.start = pos->start; 676 event->mmap2.len = pos->end - pos->start; 677 event->mmap2.pid = machine->pid; 678 679 memcpy(event->mmap2.filename, pos->dso->long_name, 680 pos->dso->long_name_len + 1); 681 682 perf_record_mmap2__read_build_id(&event->mmap2, false); 683 } else { 684 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 685 event->mmap.header.type = PERF_RECORD_MMAP; 686 event->mmap.header.size = (sizeof(event->mmap) - 687 (sizeof(event->mmap.filename) - size)); 688 memset(event->mmap.filename + size, 0, machine->id_hdr_size); 689 event->mmap.header.size += machine->id_hdr_size; 690 event->mmap.start = pos->start; 691 event->mmap.len = pos->end - pos->start; 692 event->mmap.pid = machine->pid; 693 694 memcpy(event->mmap.filename, pos->dso->long_name, 695 pos->dso->long_name_len + 1); 696 } 697 698 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 699 rc = -1; 700 break; 701 } 702 } 703 704 free(event); 705 return rc; 706 } 707 708 static int filter_task(const struct dirent *dirent) 709 { 710 return isdigit(dirent->d_name[0]); 711 } 712 713 static int __event__synthesize_thread(union perf_event *comm_event, 714 union perf_event *mmap_event, 715 union perf_event *fork_event, 716 union perf_event *namespaces_event, 717 pid_t pid, int full, perf_event__handler_t process, 718 struct perf_tool *tool, struct machine *machine, 719 bool needs_mmap, bool mmap_data) 720 { 721 char filename[PATH_MAX]; 722 struct dirent **dirent; 723 pid_t tgid, ppid; 724 int rc = 0; 725 int i, n; 726 727 /* special case: only send one comm event using passed in pid */ 728 if (!full) { 729 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 730 process, machine); 731 732 if (tgid == -1) 733 return -1; 734 735 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 736 tgid, process, machine) < 0) 737 return -1; 738 739 /* 740 * send mmap only for thread group leader 741 * see thread__init_maps() 742 */ 743 if (pid == tgid && needs_mmap && 744 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 745 process, machine, mmap_data)) 746 return -1; 747 748 return 0; 749 } 750 751 if (machine__is_default_guest(machine)) 752 return 0; 753 754 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 755 machine->root_dir, pid); 756 757 n = scandir(filename, &dirent, filter_task, NULL); 758 if (n < 0) 759 return n; 760 761 for (i = 0; i < n; i++) { 762 char *end; 763 pid_t _pid; 764 bool kernel_thread = false; 765 766 _pid = strtol(dirent[i]->d_name, &end, 10); 767 if (*end) 768 continue; 769 770 /* some threads may exit just after scan, ignore it */ 771 if (perf_event__prepare_comm(comm_event, pid, _pid, machine, 772 &tgid, &ppid, &kernel_thread) != 0) 773 continue; 774 775 rc = -1; 776 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 777 ppid, process, machine) < 0) 778 break; 779 780 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 781 tgid, process, machine) < 0) 782 break; 783 784 /* 785 * Send the prepared comm event 786 */ 787 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 788 break; 789 790 rc = 0; 791 if (_pid == pid && !kernel_thread && needs_mmap) { 792 /* process the parent's maps too */ 793 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 794 process, machine, mmap_data); 795 if (rc) 796 break; 797 } 798 } 799 800 for (i = 0; i < n; i++) 801 zfree(&dirent[i]); 802 free(dirent); 803 804 return rc; 805 } 806 807 int perf_event__synthesize_thread_map(struct perf_tool *tool, 808 struct perf_thread_map *threads, 809 perf_event__handler_t process, 810 struct machine *machine, 811 bool needs_mmap, bool mmap_data) 812 { 813 union perf_event *comm_event, *mmap_event, *fork_event; 814 union perf_event *namespaces_event; 815 int err = -1, thread, j; 816 817 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 818 if (comm_event == NULL) 819 goto out; 820 821 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 822 if (mmap_event == NULL) 823 goto out_free_comm; 824 825 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 826 if (fork_event == NULL) 827 goto out_free_mmap; 828 829 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 830 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 831 machine->id_hdr_size); 832 if (namespaces_event == NULL) 833 goto out_free_fork; 834 835 err = 0; 836 for (thread = 0; thread < threads->nr; ++thread) { 837 if (__event__synthesize_thread(comm_event, mmap_event, 838 fork_event, namespaces_event, 839 perf_thread_map__pid(threads, thread), 0, 840 process, tool, machine, 841 needs_mmap, mmap_data)) { 842 err = -1; 843 break; 844 } 845 846 /* 847 * comm.pid is set to thread group id by 848 * perf_event__synthesize_comm 849 */ 850 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 851 bool need_leader = true; 852 853 /* is thread group leader in thread_map? */ 854 for (j = 0; j < threads->nr; ++j) { 855 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 856 need_leader = false; 857 break; 858 } 859 } 860 861 /* if not, generate events for it */ 862 if (need_leader && 863 __event__synthesize_thread(comm_event, mmap_event, 864 fork_event, namespaces_event, 865 comm_event->comm.pid, 0, 866 process, tool, machine, 867 needs_mmap, mmap_data)) { 868 err = -1; 869 break; 870 } 871 } 872 } 873 free(namespaces_event); 874 out_free_fork: 875 free(fork_event); 876 out_free_mmap: 877 free(mmap_event); 878 out_free_comm: 879 free(comm_event); 880 out: 881 return err; 882 } 883 884 static int __perf_event__synthesize_threads(struct perf_tool *tool, 885 perf_event__handler_t process, 886 struct machine *machine, 887 bool needs_mmap, 888 bool mmap_data, 889 struct dirent **dirent, 890 int start, 891 int num) 892 { 893 union perf_event *comm_event, *mmap_event, *fork_event; 894 union perf_event *namespaces_event; 895 int err = -1; 896 char *end; 897 pid_t pid; 898 int i; 899 900 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 901 if (comm_event == NULL) 902 goto out; 903 904 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 905 if (mmap_event == NULL) 906 goto out_free_comm; 907 908 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 909 if (fork_event == NULL) 910 goto out_free_mmap; 911 912 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 913 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 914 machine->id_hdr_size); 915 if (namespaces_event == NULL) 916 goto out_free_fork; 917 918 for (i = start; i < start + num; i++) { 919 if (!isdigit(dirent[i]->d_name[0])) 920 continue; 921 922 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 923 /* only interested in proper numerical dirents */ 924 if (*end) 925 continue; 926 /* 927 * We may race with exiting thread, so don't stop just because 928 * one thread couldn't be synthesized. 929 */ 930 __event__synthesize_thread(comm_event, mmap_event, fork_event, 931 namespaces_event, pid, 1, process, 932 tool, machine, needs_mmap, mmap_data); 933 } 934 err = 0; 935 936 free(namespaces_event); 937 out_free_fork: 938 free(fork_event); 939 out_free_mmap: 940 free(mmap_event); 941 out_free_comm: 942 free(comm_event); 943 out: 944 return err; 945 } 946 947 struct synthesize_threads_arg { 948 struct perf_tool *tool; 949 perf_event__handler_t process; 950 struct machine *machine; 951 bool needs_mmap; 952 bool mmap_data; 953 struct dirent **dirent; 954 int num; 955 int start; 956 }; 957 958 static void *synthesize_threads_worker(void *arg) 959 { 960 struct synthesize_threads_arg *args = arg; 961 962 __perf_event__synthesize_threads(args->tool, args->process, 963 args->machine, 964 args->needs_mmap, args->mmap_data, 965 args->dirent, 966 args->start, args->num); 967 return NULL; 968 } 969 970 int perf_event__synthesize_threads(struct perf_tool *tool, 971 perf_event__handler_t process, 972 struct machine *machine, 973 bool needs_mmap, bool mmap_data, 974 unsigned int nr_threads_synthesize) 975 { 976 struct synthesize_threads_arg *args = NULL; 977 pthread_t *synthesize_threads = NULL; 978 char proc_path[PATH_MAX]; 979 struct dirent **dirent; 980 int num_per_thread; 981 int m, n, i, j; 982 int thread_nr; 983 int base = 0; 984 int err = -1; 985 986 987 if (machine__is_default_guest(machine)) 988 return 0; 989 990 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 991 n = scandir(proc_path, &dirent, filter_task, NULL); 992 if (n < 0) 993 return err; 994 995 if (nr_threads_synthesize == UINT_MAX) 996 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 997 else 998 thread_nr = nr_threads_synthesize; 999 1000 if (thread_nr <= 1) { 1001 err = __perf_event__synthesize_threads(tool, process, 1002 machine, 1003 needs_mmap, mmap_data, 1004 dirent, base, n); 1005 goto free_dirent; 1006 } 1007 if (thread_nr > n) 1008 thread_nr = n; 1009 1010 synthesize_threads = calloc(sizeof(pthread_t), thread_nr); 1011 if (synthesize_threads == NULL) 1012 goto free_dirent; 1013 1014 args = calloc(sizeof(*args), thread_nr); 1015 if (args == NULL) 1016 goto free_threads; 1017 1018 num_per_thread = n / thread_nr; 1019 m = n % thread_nr; 1020 for (i = 0; i < thread_nr; i++) { 1021 args[i].tool = tool; 1022 args[i].process = process; 1023 args[i].machine = machine; 1024 args[i].needs_mmap = needs_mmap; 1025 args[i].mmap_data = mmap_data; 1026 args[i].dirent = dirent; 1027 } 1028 for (i = 0; i < m; i++) { 1029 args[i].num = num_per_thread + 1; 1030 args[i].start = i * args[i].num; 1031 } 1032 if (i != 0) 1033 base = args[i-1].start + args[i-1].num; 1034 for (j = i; j < thread_nr; j++) { 1035 args[j].num = num_per_thread; 1036 args[j].start = base + (j - i) * args[i].num; 1037 } 1038 1039 for (i = 0; i < thread_nr; i++) { 1040 if (pthread_create(&synthesize_threads[i], NULL, 1041 synthesize_threads_worker, &args[i])) 1042 goto out_join; 1043 } 1044 err = 0; 1045 out_join: 1046 for (i = 0; i < thread_nr; i++) 1047 pthread_join(synthesize_threads[i], NULL); 1048 free(args); 1049 free_threads: 1050 free(synthesize_threads); 1051 free_dirent: 1052 for (i = 0; i < n; i++) 1053 zfree(&dirent[i]); 1054 free(dirent); 1055 1056 return err; 1057 } 1058 1059 int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 1060 perf_event__handler_t process __maybe_unused, 1061 struct machine *machine __maybe_unused) 1062 { 1063 return 0; 1064 } 1065 1066 static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1067 perf_event__handler_t process, 1068 struct machine *machine) 1069 { 1070 union perf_event *event; 1071 size_t size = symbol_conf.buildid_mmap2 ? 1072 sizeof(event->mmap2) : sizeof(event->mmap); 1073 struct map *map = machine__kernel_map(machine); 1074 struct kmap *kmap; 1075 int err; 1076 1077 if (map == NULL) 1078 return -1; 1079 1080 kmap = map__kmap(map); 1081 if (!kmap->ref_reloc_sym) 1082 return -1; 1083 1084 /* 1085 * We should get this from /sys/kernel/sections/.text, but till that is 1086 * available use this, and after it is use this as a fallback for older 1087 * kernels. 1088 */ 1089 event = zalloc(size + machine->id_hdr_size); 1090 if (event == NULL) { 1091 pr_debug("Not enough memory synthesizing mmap event " 1092 "for kernel modules\n"); 1093 return -1; 1094 } 1095 1096 if (machine__is_host(machine)) { 1097 /* 1098 * kernel uses PERF_RECORD_MISC_USER for user space maps, 1099 * see kernel/perf_event.c __perf_event_mmap 1100 */ 1101 event->header.misc = PERF_RECORD_MISC_KERNEL; 1102 } else { 1103 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 1104 } 1105 1106 if (symbol_conf.buildid_mmap2) { 1107 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename), 1108 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1109 size = PERF_ALIGN(size, sizeof(u64)); 1110 event->mmap2.header.type = PERF_RECORD_MMAP2; 1111 event->mmap2.header.size = (sizeof(event->mmap2) - 1112 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size); 1113 event->mmap2.pgoff = kmap->ref_reloc_sym->addr; 1114 event->mmap2.start = map->start; 1115 event->mmap2.len = map->end - event->mmap.start; 1116 event->mmap2.pid = machine->pid; 1117 1118 perf_record_mmap2__read_build_id(&event->mmap2, true); 1119 } else { 1120 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 1121 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1122 size = PERF_ALIGN(size, sizeof(u64)); 1123 event->mmap.header.type = PERF_RECORD_MMAP; 1124 event->mmap.header.size = (sizeof(event->mmap) - 1125 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 1126 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 1127 event->mmap.start = map->start; 1128 event->mmap.len = map->end - event->mmap.start; 1129 event->mmap.pid = machine->pid; 1130 } 1131 1132 err = perf_tool__process_synth_event(tool, event, machine, process); 1133 free(event); 1134 1135 return err; 1136 } 1137 1138 int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1139 perf_event__handler_t process, 1140 struct machine *machine) 1141 { 1142 int err; 1143 1144 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 1145 if (err < 0) 1146 return err; 1147 1148 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1149 } 1150 1151 int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1152 struct perf_thread_map *threads, 1153 perf_event__handler_t process, 1154 struct machine *machine) 1155 { 1156 union perf_event *event; 1157 int i, err, size; 1158 1159 size = sizeof(event->thread_map); 1160 size += threads->nr * sizeof(event->thread_map.entries[0]); 1161 1162 event = zalloc(size); 1163 if (!event) 1164 return -ENOMEM; 1165 1166 event->header.type = PERF_RECORD_THREAD_MAP; 1167 event->header.size = size; 1168 event->thread_map.nr = threads->nr; 1169 1170 for (i = 0; i < threads->nr; i++) { 1171 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1172 char *comm = perf_thread_map__comm(threads, i); 1173 1174 if (!comm) 1175 comm = (char *) ""; 1176 1177 entry->pid = perf_thread_map__pid(threads, i); 1178 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1179 } 1180 1181 err = process(tool, event, NULL, machine); 1182 1183 free(event); 1184 return err; 1185 } 1186 1187 static void synthesize_cpus(struct cpu_map_entries *cpus, 1188 struct perf_cpu_map *map) 1189 { 1190 int i, map_nr = perf_cpu_map__nr(map); 1191 1192 cpus->nr = map_nr; 1193 1194 for (i = 0; i < map_nr; i++) 1195 cpus->cpu[i] = perf_cpu_map__cpu(map, i).cpu; 1196 } 1197 1198 static void synthesize_mask(struct perf_record_record_cpu_map *mask, 1199 struct perf_cpu_map *map, int max) 1200 { 1201 int i; 1202 1203 mask->nr = BITS_TO_LONGS(max); 1204 mask->long_size = sizeof(long); 1205 1206 for (i = 0; i < perf_cpu_map__nr(map); i++) 1207 set_bit(perf_cpu_map__cpu(map, i).cpu, mask->mask); 1208 } 1209 1210 static size_t cpus_size(struct perf_cpu_map *map) 1211 { 1212 return sizeof(struct cpu_map_entries) + perf_cpu_map__nr(map) * sizeof(u16); 1213 } 1214 1215 static size_t mask_size(struct perf_cpu_map *map, int *max) 1216 { 1217 int i; 1218 1219 *max = 0; 1220 1221 for (i = 0; i < perf_cpu_map__nr(map); i++) { 1222 /* bit position of the cpu is + 1 */ 1223 int bit = perf_cpu_map__cpu(map, i).cpu + 1; 1224 1225 if (bit > *max) 1226 *max = bit; 1227 } 1228 1229 return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long); 1230 } 1231 1232 void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max) 1233 { 1234 size_t size_cpus, size_mask; 1235 bool is_dummy = perf_cpu_map__empty(map); 1236 1237 /* 1238 * Both array and mask data have variable size based 1239 * on the number of cpus and their actual values. 1240 * The size of the 'struct perf_record_cpu_map_data' is: 1241 * 1242 * array = size of 'struct cpu_map_entries' + 1243 * number of cpus * sizeof(u64) 1244 * 1245 * mask = size of 'struct perf_record_record_cpu_map' + 1246 * maximum cpu bit converted to size of longs 1247 * 1248 * and finally + the size of 'struct perf_record_cpu_map_data'. 1249 */ 1250 size_cpus = cpus_size(map); 1251 size_mask = mask_size(map, max); 1252 1253 if (is_dummy || (size_cpus < size_mask)) { 1254 *size += size_cpus; 1255 *type = PERF_CPU_MAP__CPUS; 1256 } else { 1257 *size += size_mask; 1258 *type = PERF_CPU_MAP__MASK; 1259 } 1260 1261 *size += sizeof(struct perf_record_cpu_map_data); 1262 *size = PERF_ALIGN(*size, sizeof(u64)); 1263 return zalloc(*size); 1264 } 1265 1266 void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map, 1267 u16 type, int max) 1268 { 1269 data->type = type; 1270 1271 switch (type) { 1272 case PERF_CPU_MAP__CPUS: 1273 synthesize_cpus((struct cpu_map_entries *) data->data, map); 1274 break; 1275 case PERF_CPU_MAP__MASK: 1276 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max); 1277 default: 1278 break; 1279 } 1280 } 1281 1282 static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map) 1283 { 1284 size_t size = sizeof(struct perf_record_cpu_map); 1285 struct perf_record_cpu_map *event; 1286 int max; 1287 u16 type; 1288 1289 event = cpu_map_data__alloc(map, &size, &type, &max); 1290 if (!event) 1291 return NULL; 1292 1293 event->header.type = PERF_RECORD_CPU_MAP; 1294 event->header.size = size; 1295 event->data.type = type; 1296 1297 cpu_map_data__synthesize(&event->data, map, type, max); 1298 return event; 1299 } 1300 1301 int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1302 struct perf_cpu_map *map, 1303 perf_event__handler_t process, 1304 struct machine *machine) 1305 { 1306 struct perf_record_cpu_map *event; 1307 int err; 1308 1309 event = cpu_map_event__new(map); 1310 if (!event) 1311 return -ENOMEM; 1312 1313 err = process(tool, (union perf_event *) event, NULL, machine); 1314 1315 free(event); 1316 return err; 1317 } 1318 1319 int perf_event__synthesize_stat_config(struct perf_tool *tool, 1320 struct perf_stat_config *config, 1321 perf_event__handler_t process, 1322 struct machine *machine) 1323 { 1324 struct perf_record_stat_config *event; 1325 int size, i = 0, err; 1326 1327 size = sizeof(*event); 1328 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1329 1330 event = zalloc(size); 1331 if (!event) 1332 return -ENOMEM; 1333 1334 event->header.type = PERF_RECORD_STAT_CONFIG; 1335 event->header.size = size; 1336 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1337 1338 #define ADD(__term, __val) \ 1339 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1340 event->data[i].val = __val; \ 1341 i++; 1342 1343 ADD(AGGR_MODE, config->aggr_mode) 1344 ADD(INTERVAL, config->interval) 1345 ADD(SCALE, config->scale) 1346 1347 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1348 "stat config terms unbalanced\n"); 1349 #undef ADD 1350 1351 err = process(tool, (union perf_event *) event, NULL, machine); 1352 1353 free(event); 1354 return err; 1355 } 1356 1357 int perf_event__synthesize_stat(struct perf_tool *tool, 1358 struct perf_cpu cpu, u32 thread, u64 id, 1359 struct perf_counts_values *count, 1360 perf_event__handler_t process, 1361 struct machine *machine) 1362 { 1363 struct perf_record_stat event; 1364 1365 event.header.type = PERF_RECORD_STAT; 1366 event.header.size = sizeof(event); 1367 event.header.misc = 0; 1368 1369 event.id = id; 1370 event.cpu = cpu.cpu; 1371 event.thread = thread; 1372 event.val = count->val; 1373 event.ena = count->ena; 1374 event.run = count->run; 1375 1376 return process(tool, (union perf_event *) &event, NULL, machine); 1377 } 1378 1379 int perf_event__synthesize_stat_round(struct perf_tool *tool, 1380 u64 evtime, u64 type, 1381 perf_event__handler_t process, 1382 struct machine *machine) 1383 { 1384 struct perf_record_stat_round event; 1385 1386 event.header.type = PERF_RECORD_STAT_ROUND; 1387 event.header.size = sizeof(event); 1388 event.header.misc = 0; 1389 1390 event.time = evtime; 1391 event.type = type; 1392 1393 return process(tool, (union perf_event *) &event, NULL, machine); 1394 } 1395 1396 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1397 { 1398 size_t sz, result = sizeof(struct perf_record_sample); 1399 1400 if (type & PERF_SAMPLE_IDENTIFIER) 1401 result += sizeof(u64); 1402 1403 if (type & PERF_SAMPLE_IP) 1404 result += sizeof(u64); 1405 1406 if (type & PERF_SAMPLE_TID) 1407 result += sizeof(u64); 1408 1409 if (type & PERF_SAMPLE_TIME) 1410 result += sizeof(u64); 1411 1412 if (type & PERF_SAMPLE_ADDR) 1413 result += sizeof(u64); 1414 1415 if (type & PERF_SAMPLE_ID) 1416 result += sizeof(u64); 1417 1418 if (type & PERF_SAMPLE_STREAM_ID) 1419 result += sizeof(u64); 1420 1421 if (type & PERF_SAMPLE_CPU) 1422 result += sizeof(u64); 1423 1424 if (type & PERF_SAMPLE_PERIOD) 1425 result += sizeof(u64); 1426 1427 if (type & PERF_SAMPLE_READ) { 1428 result += sizeof(u64); 1429 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1430 result += sizeof(u64); 1431 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1432 result += sizeof(u64); 1433 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1434 if (read_format & PERF_FORMAT_GROUP) { 1435 sz = sample->read.group.nr * 1436 sizeof(struct sample_read_value); 1437 result += sz; 1438 } else { 1439 result += sizeof(u64); 1440 } 1441 } 1442 1443 if (type & PERF_SAMPLE_CALLCHAIN) { 1444 sz = (sample->callchain->nr + 1) * sizeof(u64); 1445 result += sz; 1446 } 1447 1448 if (type & PERF_SAMPLE_RAW) { 1449 result += sizeof(u32); 1450 result += sample->raw_size; 1451 } 1452 1453 if (type & PERF_SAMPLE_BRANCH_STACK) { 1454 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1455 /* nr, hw_idx */ 1456 sz += 2 * sizeof(u64); 1457 result += sz; 1458 } 1459 1460 if (type & PERF_SAMPLE_REGS_USER) { 1461 if (sample->user_regs.abi) { 1462 result += sizeof(u64); 1463 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1464 result += sz; 1465 } else { 1466 result += sizeof(u64); 1467 } 1468 } 1469 1470 if (type & PERF_SAMPLE_STACK_USER) { 1471 sz = sample->user_stack.size; 1472 result += sizeof(u64); 1473 if (sz) { 1474 result += sz; 1475 result += sizeof(u64); 1476 } 1477 } 1478 1479 if (type & PERF_SAMPLE_WEIGHT_TYPE) 1480 result += sizeof(u64); 1481 1482 if (type & PERF_SAMPLE_DATA_SRC) 1483 result += sizeof(u64); 1484 1485 if (type & PERF_SAMPLE_TRANSACTION) 1486 result += sizeof(u64); 1487 1488 if (type & PERF_SAMPLE_REGS_INTR) { 1489 if (sample->intr_regs.abi) { 1490 result += sizeof(u64); 1491 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1492 result += sz; 1493 } else { 1494 result += sizeof(u64); 1495 } 1496 } 1497 1498 if (type & PERF_SAMPLE_PHYS_ADDR) 1499 result += sizeof(u64); 1500 1501 if (type & PERF_SAMPLE_CGROUP) 1502 result += sizeof(u64); 1503 1504 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) 1505 result += sizeof(u64); 1506 1507 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) 1508 result += sizeof(u64); 1509 1510 if (type & PERF_SAMPLE_AUX) { 1511 result += sizeof(u64); 1512 result += sample->aux_sample.size; 1513 } 1514 1515 return result; 1516 } 1517 1518 void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data, 1519 __u64 *array, u64 type __maybe_unused) 1520 { 1521 *array = data->weight; 1522 } 1523 1524 int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1525 const struct perf_sample *sample) 1526 { 1527 __u64 *array; 1528 size_t sz; 1529 /* 1530 * used for cross-endian analysis. See git commit 65014ab3 1531 * for why this goofiness is needed. 1532 */ 1533 union u64_swap u; 1534 1535 array = event->sample.array; 1536 1537 if (type & PERF_SAMPLE_IDENTIFIER) { 1538 *array = sample->id; 1539 array++; 1540 } 1541 1542 if (type & PERF_SAMPLE_IP) { 1543 *array = sample->ip; 1544 array++; 1545 } 1546 1547 if (type & PERF_SAMPLE_TID) { 1548 u.val32[0] = sample->pid; 1549 u.val32[1] = sample->tid; 1550 *array = u.val64; 1551 array++; 1552 } 1553 1554 if (type & PERF_SAMPLE_TIME) { 1555 *array = sample->time; 1556 array++; 1557 } 1558 1559 if (type & PERF_SAMPLE_ADDR) { 1560 *array = sample->addr; 1561 array++; 1562 } 1563 1564 if (type & PERF_SAMPLE_ID) { 1565 *array = sample->id; 1566 array++; 1567 } 1568 1569 if (type & PERF_SAMPLE_STREAM_ID) { 1570 *array = sample->stream_id; 1571 array++; 1572 } 1573 1574 if (type & PERF_SAMPLE_CPU) { 1575 u.val32[0] = sample->cpu; 1576 u.val32[1] = 0; 1577 *array = u.val64; 1578 array++; 1579 } 1580 1581 if (type & PERF_SAMPLE_PERIOD) { 1582 *array = sample->period; 1583 array++; 1584 } 1585 1586 if (type & PERF_SAMPLE_READ) { 1587 if (read_format & PERF_FORMAT_GROUP) 1588 *array = sample->read.group.nr; 1589 else 1590 *array = sample->read.one.value; 1591 array++; 1592 1593 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1594 *array = sample->read.time_enabled; 1595 array++; 1596 } 1597 1598 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1599 *array = sample->read.time_running; 1600 array++; 1601 } 1602 1603 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1604 if (read_format & PERF_FORMAT_GROUP) { 1605 sz = sample->read.group.nr * 1606 sizeof(struct sample_read_value); 1607 memcpy(array, sample->read.group.values, sz); 1608 array = (void *)array + sz; 1609 } else { 1610 *array = sample->read.one.id; 1611 array++; 1612 } 1613 } 1614 1615 if (type & PERF_SAMPLE_CALLCHAIN) { 1616 sz = (sample->callchain->nr + 1) * sizeof(u64); 1617 memcpy(array, sample->callchain, sz); 1618 array = (void *)array + sz; 1619 } 1620 1621 if (type & PERF_SAMPLE_RAW) { 1622 u.val32[0] = sample->raw_size; 1623 *array = u.val64; 1624 array = (void *)array + sizeof(u32); 1625 1626 memcpy(array, sample->raw_data, sample->raw_size); 1627 array = (void *)array + sample->raw_size; 1628 } 1629 1630 if (type & PERF_SAMPLE_BRANCH_STACK) { 1631 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1632 /* nr, hw_idx */ 1633 sz += 2 * sizeof(u64); 1634 memcpy(array, sample->branch_stack, sz); 1635 array = (void *)array + sz; 1636 } 1637 1638 if (type & PERF_SAMPLE_REGS_USER) { 1639 if (sample->user_regs.abi) { 1640 *array++ = sample->user_regs.abi; 1641 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1642 memcpy(array, sample->user_regs.regs, sz); 1643 array = (void *)array + sz; 1644 } else { 1645 *array++ = 0; 1646 } 1647 } 1648 1649 if (type & PERF_SAMPLE_STACK_USER) { 1650 sz = sample->user_stack.size; 1651 *array++ = sz; 1652 if (sz) { 1653 memcpy(array, sample->user_stack.data, sz); 1654 array = (void *)array + sz; 1655 *array++ = sz; 1656 } 1657 } 1658 1659 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 1660 arch_perf_synthesize_sample_weight(sample, array, type); 1661 array++; 1662 } 1663 1664 if (type & PERF_SAMPLE_DATA_SRC) { 1665 *array = sample->data_src; 1666 array++; 1667 } 1668 1669 if (type & PERF_SAMPLE_TRANSACTION) { 1670 *array = sample->transaction; 1671 array++; 1672 } 1673 1674 if (type & PERF_SAMPLE_REGS_INTR) { 1675 if (sample->intr_regs.abi) { 1676 *array++ = sample->intr_regs.abi; 1677 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1678 memcpy(array, sample->intr_regs.regs, sz); 1679 array = (void *)array + sz; 1680 } else { 1681 *array++ = 0; 1682 } 1683 } 1684 1685 if (type & PERF_SAMPLE_PHYS_ADDR) { 1686 *array = sample->phys_addr; 1687 array++; 1688 } 1689 1690 if (type & PERF_SAMPLE_CGROUP) { 1691 *array = sample->cgroup; 1692 array++; 1693 } 1694 1695 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 1696 *array = sample->data_page_size; 1697 array++; 1698 } 1699 1700 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 1701 *array = sample->code_page_size; 1702 array++; 1703 } 1704 1705 if (type & PERF_SAMPLE_AUX) { 1706 sz = sample->aux_sample.size; 1707 *array++ = sz; 1708 memcpy(array, sample->aux_sample.data, sz); 1709 array = (void *)array + sz; 1710 } 1711 1712 return 0; 1713 } 1714 1715 int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1716 struct evlist *evlist, struct machine *machine) 1717 { 1718 union perf_event *ev; 1719 struct evsel *evsel; 1720 size_t nr = 0, i = 0, sz, max_nr, n; 1721 int err; 1722 1723 pr_debug2("Synthesizing id index\n"); 1724 1725 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / 1726 sizeof(struct id_index_entry); 1727 1728 evlist__for_each_entry(evlist, evsel) 1729 nr += evsel->core.ids; 1730 1731 n = nr > max_nr ? max_nr : nr; 1732 sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry); 1733 ev = zalloc(sz); 1734 if (!ev) 1735 return -ENOMEM; 1736 1737 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1738 ev->id_index.header.size = sz; 1739 ev->id_index.nr = n; 1740 1741 evlist__for_each_entry(evlist, evsel) { 1742 u32 j; 1743 1744 for (j = 0; j < evsel->core.ids; j++) { 1745 struct id_index_entry *e; 1746 struct perf_sample_id *sid; 1747 1748 if (i >= n) { 1749 err = process(tool, ev, NULL, machine); 1750 if (err) 1751 goto out_err; 1752 nr -= n; 1753 i = 0; 1754 } 1755 1756 e = &ev->id_index.entries[i++]; 1757 1758 e->id = evsel->core.id[j]; 1759 1760 sid = evlist__id2sid(evlist, e->id); 1761 if (!sid) { 1762 free(ev); 1763 return -ENOENT; 1764 } 1765 1766 e->idx = sid->idx; 1767 e->cpu = sid->cpu.cpu; 1768 e->tid = sid->tid; 1769 } 1770 } 1771 1772 sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry); 1773 ev->id_index.header.size = sz; 1774 ev->id_index.nr = nr; 1775 1776 err = process(tool, ev, NULL, machine); 1777 out_err: 1778 free(ev); 1779 1780 return err; 1781 } 1782 1783 int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1784 struct target *target, struct perf_thread_map *threads, 1785 perf_event__handler_t process, bool needs_mmap, 1786 bool data_mmap, unsigned int nr_threads_synthesize) 1787 { 1788 /* 1789 * When perf runs in non-root PID namespace, and the namespace's proc FS 1790 * is not mounted, nsinfo__is_in_root_namespace() returns false. 1791 * In this case, the proc FS is coming for the parent namespace, thus 1792 * perf tool will wrongly gather process info from its parent PID 1793 * namespace. 1794 * 1795 * To avoid the confusion that the perf tool runs in a child PID 1796 * namespace but it synthesizes thread info from its parent PID 1797 * namespace, returns failure with warning. 1798 */ 1799 if (!nsinfo__is_in_root_namespace()) { 1800 pr_err("Perf runs in non-root PID namespace but it tries to "); 1801 pr_err("gather process info from its parent PID namespace.\n"); 1802 pr_err("Please mount the proc file system properly, e.g. "); 1803 pr_err("add the option '--mount-proc' for unshare command.\n"); 1804 return -EPERM; 1805 } 1806 1807 if (target__has_task(target)) 1808 return perf_event__synthesize_thread_map(tool, threads, process, machine, 1809 needs_mmap, data_mmap); 1810 else if (target__has_cpu(target)) 1811 return perf_event__synthesize_threads(tool, process, machine, 1812 needs_mmap, data_mmap, 1813 nr_threads_synthesize); 1814 /* command specified */ 1815 return 0; 1816 } 1817 1818 int machine__synthesize_threads(struct machine *machine, struct target *target, 1819 struct perf_thread_map *threads, bool needs_mmap, 1820 bool data_mmap, unsigned int nr_threads_synthesize) 1821 { 1822 return __machine__synthesize_threads(machine, NULL, target, threads, 1823 perf_event__process, needs_mmap, 1824 data_mmap, nr_threads_synthesize); 1825 } 1826 1827 static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1828 { 1829 struct perf_record_event_update *ev; 1830 1831 size += sizeof(*ev); 1832 size = PERF_ALIGN(size, sizeof(u64)); 1833 1834 ev = zalloc(size); 1835 if (ev) { 1836 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1837 ev->header.size = (u16)size; 1838 ev->type = type; 1839 ev->id = id; 1840 } 1841 return ev; 1842 } 1843 1844 int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1845 perf_event__handler_t process) 1846 { 1847 size_t size = strlen(evsel->unit); 1848 struct perf_record_event_update *ev; 1849 int err; 1850 1851 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1852 if (ev == NULL) 1853 return -ENOMEM; 1854 1855 strlcpy(ev->data, evsel->unit, size + 1); 1856 err = process(tool, (union perf_event *)ev, NULL, NULL); 1857 free(ev); 1858 return err; 1859 } 1860 1861 int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 1862 perf_event__handler_t process) 1863 { 1864 struct perf_record_event_update *ev; 1865 struct perf_record_event_update_scale *ev_data; 1866 int err; 1867 1868 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 1869 if (ev == NULL) 1870 return -ENOMEM; 1871 1872 ev_data = (struct perf_record_event_update_scale *)ev->data; 1873 ev_data->scale = evsel->scale; 1874 err = process(tool, (union perf_event *)ev, NULL, NULL); 1875 free(ev); 1876 return err; 1877 } 1878 1879 int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 1880 perf_event__handler_t process) 1881 { 1882 struct perf_record_event_update *ev; 1883 size_t len = strlen(evsel->name); 1884 int err; 1885 1886 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 1887 if (ev == NULL) 1888 return -ENOMEM; 1889 1890 strlcpy(ev->data, evsel->name, len + 1); 1891 err = process(tool, (union perf_event *)ev, NULL, NULL); 1892 free(ev); 1893 return err; 1894 } 1895 1896 int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 1897 perf_event__handler_t process) 1898 { 1899 size_t size = sizeof(struct perf_record_event_update); 1900 struct perf_record_event_update *ev; 1901 int max, err; 1902 u16 type; 1903 1904 if (!evsel->core.own_cpus) 1905 return 0; 1906 1907 ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max); 1908 if (!ev) 1909 return -ENOMEM; 1910 1911 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1912 ev->header.size = (u16)size; 1913 ev->type = PERF_EVENT_UPDATE__CPUS; 1914 ev->id = evsel->core.id[0]; 1915 1916 cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data, 1917 evsel->core.own_cpus, type, max); 1918 1919 err = process(tool, (union perf_event *)ev, NULL, NULL); 1920 free(ev); 1921 return err; 1922 } 1923 1924 int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 1925 perf_event__handler_t process) 1926 { 1927 struct evsel *evsel; 1928 int err = 0; 1929 1930 evlist__for_each_entry(evlist, evsel) { 1931 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 1932 evsel->core.id, process); 1933 if (err) { 1934 pr_debug("failed to create perf header attribute\n"); 1935 return err; 1936 } 1937 } 1938 1939 return err; 1940 } 1941 1942 static bool has_unit(struct evsel *evsel) 1943 { 1944 return evsel->unit && *evsel->unit; 1945 } 1946 1947 static bool has_scale(struct evsel *evsel) 1948 { 1949 return evsel->scale != 1; 1950 } 1951 1952 int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 1953 perf_event__handler_t process, bool is_pipe) 1954 { 1955 struct evsel *evsel; 1956 int err; 1957 1958 /* 1959 * Synthesize other events stuff not carried within 1960 * attr event - unit, scale, name 1961 */ 1962 evlist__for_each_entry(evsel_list, evsel) { 1963 if (!evsel->supported) 1964 continue; 1965 1966 /* 1967 * Synthesize unit and scale only if it's defined. 1968 */ 1969 if (has_unit(evsel)) { 1970 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 1971 if (err < 0) { 1972 pr_err("Couldn't synthesize evsel unit.\n"); 1973 return err; 1974 } 1975 } 1976 1977 if (has_scale(evsel)) { 1978 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 1979 if (err < 0) { 1980 pr_err("Couldn't synthesize evsel evsel.\n"); 1981 return err; 1982 } 1983 } 1984 1985 if (evsel->core.own_cpus) { 1986 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 1987 if (err < 0) { 1988 pr_err("Couldn't synthesize evsel cpus.\n"); 1989 return err; 1990 } 1991 } 1992 1993 /* 1994 * Name is needed only for pipe output, 1995 * perf.data carries event names. 1996 */ 1997 if (is_pipe) { 1998 err = perf_event__synthesize_event_update_name(tool, evsel, process); 1999 if (err < 0) { 2000 pr_err("Couldn't synthesize evsel name.\n"); 2001 return err; 2002 } 2003 } 2004 } 2005 return 0; 2006 } 2007 2008 int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 2009 u32 ids, u64 *id, perf_event__handler_t process) 2010 { 2011 union perf_event *ev; 2012 size_t size; 2013 int err; 2014 2015 size = sizeof(struct perf_event_attr); 2016 size = PERF_ALIGN(size, sizeof(u64)); 2017 size += sizeof(struct perf_event_header); 2018 size += ids * sizeof(u64); 2019 2020 ev = zalloc(size); 2021 2022 if (ev == NULL) 2023 return -ENOMEM; 2024 2025 ev->attr.attr = *attr; 2026 memcpy(ev->attr.id, id, ids * sizeof(u64)); 2027 2028 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 2029 ev->attr.header.size = (u16)size; 2030 2031 if (ev->attr.header.size == size) 2032 err = process(tool, ev, NULL, NULL); 2033 else 2034 err = -E2BIG; 2035 2036 free(ev); 2037 2038 return err; 2039 } 2040 2041 int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 2042 perf_event__handler_t process) 2043 { 2044 union perf_event ev; 2045 struct tracing_data *tdata; 2046 ssize_t size = 0, aligned_size = 0, padding; 2047 struct feat_fd ff; 2048 2049 /* 2050 * We are going to store the size of the data followed 2051 * by the data contents. Since the fd descriptor is a pipe, 2052 * we cannot seek back to store the size of the data once 2053 * we know it. Instead we: 2054 * 2055 * - write the tracing data to the temp file 2056 * - get/write the data size to pipe 2057 * - write the tracing data from the temp file 2058 * to the pipe 2059 */ 2060 tdata = tracing_data_get(&evlist->core.entries, fd, true); 2061 if (!tdata) 2062 return -1; 2063 2064 memset(&ev, 0, sizeof(ev)); 2065 2066 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 2067 size = tdata->size; 2068 aligned_size = PERF_ALIGN(size, sizeof(u64)); 2069 padding = aligned_size - size; 2070 ev.tracing_data.header.size = sizeof(ev.tracing_data); 2071 ev.tracing_data.size = aligned_size; 2072 2073 process(tool, &ev, NULL, NULL); 2074 2075 /* 2076 * The put function will copy all the tracing data 2077 * stored in temp file to the pipe. 2078 */ 2079 tracing_data_put(tdata); 2080 2081 ff = (struct feat_fd){ .fd = fd }; 2082 if (write_padded(&ff, NULL, 0, padding)) 2083 return -1; 2084 2085 return aligned_size; 2086 } 2087 2088 int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 2089 perf_event__handler_t process, struct machine *machine) 2090 { 2091 union perf_event ev; 2092 size_t len; 2093 2094 if (!pos->hit) 2095 return 0; 2096 2097 memset(&ev, 0, sizeof(ev)); 2098 2099 len = pos->long_name_len + 1; 2100 len = PERF_ALIGN(len, NAME_ALIGN); 2101 memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data)); 2102 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 2103 ev.build_id.header.misc = misc; 2104 ev.build_id.pid = machine->pid; 2105 ev.build_id.header.size = sizeof(ev.build_id) + len; 2106 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 2107 2108 return process(tool, &ev, NULL, machine); 2109 } 2110 2111 int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 2112 struct evlist *evlist, perf_event__handler_t process, bool attrs) 2113 { 2114 int err; 2115 2116 if (attrs) { 2117 err = perf_event__synthesize_attrs(tool, evlist, process); 2118 if (err < 0) { 2119 pr_err("Couldn't synthesize attrs.\n"); 2120 return err; 2121 } 2122 } 2123 2124 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 2125 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 2126 if (err < 0) { 2127 pr_err("Couldn't synthesize thread map.\n"); 2128 return err; 2129 } 2130 2131 err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL); 2132 if (err < 0) { 2133 pr_err("Couldn't synthesize thread map.\n"); 2134 return err; 2135 } 2136 2137 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 2138 if (err < 0) { 2139 pr_err("Couldn't synthesize config.\n"); 2140 return err; 2141 } 2142 2143 return 0; 2144 } 2145 2146 extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 2147 2148 int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 2149 struct evlist *evlist, perf_event__handler_t process) 2150 { 2151 struct perf_header *header = &session->header; 2152 struct perf_record_header_feature *fe; 2153 struct feat_fd ff; 2154 size_t sz, sz_hdr; 2155 int feat, ret; 2156 2157 sz_hdr = sizeof(fe->header); 2158 sz = sizeof(union perf_event); 2159 /* get a nice alignment */ 2160 sz = PERF_ALIGN(sz, page_size); 2161 2162 memset(&ff, 0, sizeof(ff)); 2163 2164 ff.buf = malloc(sz); 2165 if (!ff.buf) 2166 return -ENOMEM; 2167 2168 ff.size = sz - sz_hdr; 2169 ff.ph = &session->header; 2170 2171 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 2172 if (!feat_ops[feat].synthesize) { 2173 pr_debug("No record header feature for header :%d\n", feat); 2174 continue; 2175 } 2176 2177 ff.offset = sizeof(*fe); 2178 2179 ret = feat_ops[feat].write(&ff, evlist); 2180 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2181 pr_debug("Error writing feature\n"); 2182 continue; 2183 } 2184 /* ff.buf may have changed due to realloc in do_write() */ 2185 fe = ff.buf; 2186 memset(fe, 0, sizeof(*fe)); 2187 2188 fe->feat_id = feat; 2189 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2190 fe->header.size = ff.offset; 2191 2192 ret = process(tool, ff.buf, NULL, NULL); 2193 if (ret) { 2194 free(ff.buf); 2195 return ret; 2196 } 2197 } 2198 2199 /* Send HEADER_LAST_FEATURE mark. */ 2200 fe = ff.buf; 2201 fe->feat_id = HEADER_LAST_FEATURE; 2202 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2203 fe->header.size = sizeof(*fe); 2204 2205 ret = process(tool, ff.buf, NULL, NULL); 2206 2207 free(ff.buf); 2208 return ret; 2209 } 2210 2211 int perf_event__synthesize_for_pipe(struct perf_tool *tool, 2212 struct perf_session *session, 2213 struct perf_data *data, 2214 perf_event__handler_t process) 2215 { 2216 int err; 2217 int ret = 0; 2218 struct evlist *evlist = session->evlist; 2219 2220 /* 2221 * We need to synthesize events first, because some 2222 * features works on top of them (on report side). 2223 */ 2224 err = perf_event__synthesize_attrs(tool, evlist, process); 2225 if (err < 0) { 2226 pr_err("Couldn't synthesize attrs.\n"); 2227 return err; 2228 } 2229 ret += err; 2230 2231 err = perf_event__synthesize_features(tool, session, evlist, process); 2232 if (err < 0) { 2233 pr_err("Couldn't synthesize features.\n"); 2234 return err; 2235 } 2236 ret += err; 2237 2238 if (have_tracepoints(&evlist->core.entries)) { 2239 int fd = perf_data__fd(data); 2240 2241 /* 2242 * FIXME err <= 0 here actually means that 2243 * there were no tracepoints so its not really 2244 * an error, just that we don't need to 2245 * synthesize anything. We really have to 2246 * return this more properly and also 2247 * propagate errors that now are calling die() 2248 */ 2249 err = perf_event__synthesize_tracing_data(tool, fd, evlist, 2250 process); 2251 if (err <= 0) { 2252 pr_err("Couldn't record tracing data.\n"); 2253 return err; 2254 } 2255 ret += err; 2256 } 2257 2258 return ret; 2259 } 2260 2261 int parse_synth_opt(char *synth) 2262 { 2263 char *p, *q; 2264 int ret = 0; 2265 2266 if (synth == NULL) 2267 return -1; 2268 2269 for (q = synth; (p = strsep(&q, ",")); p = q) { 2270 if (!strcasecmp(p, "no") || !strcasecmp(p, "none")) 2271 return 0; 2272 2273 if (!strcasecmp(p, "all")) 2274 return PERF_SYNTH_ALL; 2275 2276 if (!strcasecmp(p, "task")) 2277 ret |= PERF_SYNTH_TASK; 2278 else if (!strcasecmp(p, "mmap")) 2279 ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP; 2280 else if (!strcasecmp(p, "cgroup")) 2281 ret |= PERF_SYNTH_CGROUP; 2282 else 2283 return -1; 2284 } 2285 2286 return ret; 2287 } 2288