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