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 48unsigned int proc_map_timeout = DEFAULT_PROC_MAP_PARSE_TIMEOUT; 49 50int 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 */ 72static 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 153static 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 190pid_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 208static 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 221int 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 260static 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 293static 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 366static void perf_record_mmap2__read_build_id(struct perf_record_mmap2 *event, 367 struct machine *machine, 368 bool is_kernel) 369{ 370 struct build_id bid; 371 struct nsinfo *nsi; 372 struct nscookie nc; 373 struct dso *dso = NULL; 374 struct dso_id id; 375 int rc; 376 377 if (is_kernel) { 378 rc = sysfs__read_build_id("/sys/kernel/notes", &bid); 379 goto out; 380 } 381 382 id.maj = event->maj; 383 id.min = event->min; 384 id.ino = event->ino; 385 id.ino_generation = event->ino_generation; 386 387 dso = dsos__findnew_id(&machine->dsos, event->filename, &id); 388 if (dso && dso->has_build_id) { 389 bid = dso->bid; 390 rc = 0; 391 goto out; 392 } 393 394 nsi = nsinfo__new(event->pid); 395 nsinfo__mountns_enter(nsi, &nc); 396 397 rc = filename__read_build_id(event->filename, &bid) > 0 ? 0 : -1; 398 399 nsinfo__mountns_exit(&nc); 400 nsinfo__put(nsi); 401 402out: 403 if (rc == 0) { 404 memcpy(event->build_id, bid.data, sizeof(bid.data)); 405 event->build_id_size = (u8) bid.size; 406 event->header.misc |= PERF_RECORD_MISC_MMAP_BUILD_ID; 407 event->__reserved_1 = 0; 408 event->__reserved_2 = 0; 409 410 if (dso && !dso->has_build_id) 411 dso__set_build_id(dso, &bid); 412 } else { 413 if (event->filename[0] == '/') { 414 pr_debug2("Failed to read build ID for %s\n", 415 event->filename); 416 } 417 } 418 dso__put(dso); 419} 420 421int perf_event__synthesize_mmap_events(struct perf_tool *tool, 422 union perf_event *event, 423 pid_t pid, pid_t tgid, 424 perf_event__handler_t process, 425 struct machine *machine, 426 bool mmap_data) 427{ 428 unsigned long long t; 429 char bf[BUFSIZ]; 430 struct io io; 431 bool truncation = false; 432 unsigned long long timeout = proc_map_timeout * 1000000ULL; 433 int rc = 0; 434 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 435 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 436 437 if (machine__is_default_guest(machine)) 438 return 0; 439 440 snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps", 441 machine->root_dir, pid, pid); 442 443 io.fd = open(bf, O_RDONLY, 0); 444 if (io.fd < 0) { 445 /* 446 * We raced with a task exiting - just return: 447 */ 448 pr_debug("couldn't open %s\n", bf); 449 return -1; 450 } 451 io__init(&io, io.fd, bf, sizeof(bf)); 452 453 event->header.type = PERF_RECORD_MMAP2; 454 t = rdclock(); 455 456 while (!io.eof) { 457 static const char anonstr[] = "//anon"; 458 size_t size, aligned_size; 459 460 /* ensure null termination since stack will be reused. */ 461 event->mmap2.filename[0] = '\0'; 462 463 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 464 if (!read_proc_maps_line(&io, 465 &event->mmap2.start, 466 &event->mmap2.len, 467 &event->mmap2.prot, 468 &event->mmap2.flags, 469 &event->mmap2.pgoff, 470 &event->mmap2.maj, 471 &event->mmap2.min, 472 &event->mmap2.ino, 473 sizeof(event->mmap2.filename), 474 event->mmap2.filename)) 475 continue; 476 477 if ((rdclock() - t) > timeout) { 478 pr_warning("Reading %s/proc/%d/task/%d/maps time out. " 479 "You may want to increase " 480 "the time limit by --proc-map-timeout\n", 481 machine->root_dir, pid, pid); 482 truncation = true; 483 goto out; 484 } 485 486 event->mmap2.ino_generation = 0; 487 488 /* 489 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 490 */ 491 if (machine__is_host(machine)) 492 event->header.misc = PERF_RECORD_MISC_USER; 493 else 494 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 495 496 if ((event->mmap2.prot & PROT_EXEC) == 0) { 497 if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0) 498 continue; 499 500 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 501 } 502 503out: 504 if (truncation) 505 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 506 507 if (!strcmp(event->mmap2.filename, "")) 508 strcpy(event->mmap2.filename, anonstr); 509 510 if (hugetlbfs_mnt_len && 511 !strncmp(event->mmap2.filename, hugetlbfs_mnt, 512 hugetlbfs_mnt_len)) { 513 strcpy(event->mmap2.filename, anonstr); 514 event->mmap2.flags |= MAP_HUGETLB; 515 } 516 517 size = strlen(event->mmap2.filename) + 1; 518 aligned_size = PERF_ALIGN(size, sizeof(u64)); 519 event->mmap2.len -= event->mmap.start; 520 event->mmap2.header.size = (sizeof(event->mmap2) - 521 (sizeof(event->mmap2.filename) - aligned_size)); 522 memset(event->mmap2.filename + size, 0, machine->id_hdr_size + 523 (aligned_size - size)); 524 event->mmap2.header.size += machine->id_hdr_size; 525 event->mmap2.pid = tgid; 526 event->mmap2.tid = pid; 527 528 if (symbol_conf.buildid_mmap2) 529 perf_record_mmap2__read_build_id(&event->mmap2, machine, false); 530 531 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 532 rc = -1; 533 break; 534 } 535 536 if (truncation) 537 break; 538 } 539 540 close(io.fd); 541 return rc; 542} 543 544#ifdef HAVE_FILE_HANDLE 545static int perf_event__synthesize_cgroup(struct perf_tool *tool, 546 union perf_event *event, 547 char *path, size_t mount_len, 548 perf_event__handler_t process, 549 struct machine *machine) 550{ 551 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 552 size_t path_len = strlen(path) - mount_len + 1; 553 struct { 554 struct file_handle fh; 555 uint64_t cgroup_id; 556 } handle; 557 int mount_id; 558 559 while (path_len % sizeof(u64)) 560 path[mount_len + path_len++] = '\0'; 561 562 memset(&event->cgroup, 0, event_size); 563 564 event->cgroup.header.type = PERF_RECORD_CGROUP; 565 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 566 567 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 568 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 569 pr_debug("stat failed: %s\n", path); 570 return -1; 571 } 572 573 event->cgroup.id = handle.cgroup_id; 574 strncpy(event->cgroup.path, path + mount_len, path_len); 575 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 576 577 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 578 pr_debug("process synth event failed\n"); 579 return -1; 580 } 581 582 return 0; 583} 584 585static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 586 union perf_event *event, 587 char *path, size_t mount_len, 588 perf_event__handler_t process, 589 struct machine *machine) 590{ 591 size_t pos = strlen(path); 592 DIR *d; 593 struct dirent *dent; 594 int ret = 0; 595 596 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 597 process, machine) < 0) 598 return -1; 599 600 d = opendir(path); 601 if (d == NULL) { 602 pr_debug("failed to open directory: %s\n", path); 603 return -1; 604 } 605 606 while ((dent = readdir(d)) != NULL) { 607 if (dent->d_type != DT_DIR) 608 continue; 609 if (!strcmp(dent->d_name, ".") || 610 !strcmp(dent->d_name, "..")) 611 continue; 612 613 /* any sane path should be less than PATH_MAX */ 614 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 615 continue; 616 617 if (path[pos - 1] != '/') 618 strcat(path, "/"); 619 strcat(path, dent->d_name); 620 621 ret = perf_event__walk_cgroup_tree(tool, event, path, 622 mount_len, process, machine); 623 if (ret < 0) 624 break; 625 626 path[pos] = '\0'; 627 } 628 629 closedir(d); 630 return ret; 631} 632 633int perf_event__synthesize_cgroups(struct perf_tool *tool, 634 perf_event__handler_t process, 635 struct machine *machine) 636{ 637 union perf_event event; 638 char cgrp_root[PATH_MAX]; 639 size_t mount_len; /* length of mount point in the path */ 640 641 if (!tool || !tool->cgroup_events) 642 return 0; 643 644 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 645 pr_debug("cannot find cgroup mount point\n"); 646 return -1; 647 } 648 649 mount_len = strlen(cgrp_root); 650 /* make sure the path starts with a slash (after mount point) */ 651 strcat(cgrp_root, "/"); 652 653 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 654 process, machine) < 0) 655 return -1; 656 657 return 0; 658} 659#else 660int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 661 perf_event__handler_t process __maybe_unused, 662 struct machine *machine __maybe_unused) 663{ 664 return -1; 665} 666#endif 667 668struct perf_event__synthesize_modules_maps_cb_args { 669 struct perf_tool *tool; 670 perf_event__handler_t process; 671 struct machine *machine; 672 union perf_event *event; 673}; 674 675static int perf_event__synthesize_modules_maps_cb(struct map *map, void *data) 676{ 677 struct perf_event__synthesize_modules_maps_cb_args *args = data; 678 union perf_event *event = args->event; 679 struct dso *dso; 680 size_t size; 681 682 if (!__map__is_kmodule(map)) 683 return 0; 684 685 dso = map__dso(map); 686 if (symbol_conf.buildid_mmap2) { 687 size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64)); 688 event->mmap2.header.type = PERF_RECORD_MMAP2; 689 event->mmap2.header.size = (sizeof(event->mmap2) - 690 (sizeof(event->mmap2.filename) - size)); 691 memset(event->mmap2.filename + size, 0, args->machine->id_hdr_size); 692 event->mmap2.header.size += args->machine->id_hdr_size; 693 event->mmap2.start = map__start(map); 694 event->mmap2.len = map__size(map); 695 event->mmap2.pid = args->machine->pid; 696 697 memcpy(event->mmap2.filename, dso->long_name, dso->long_name_len + 1); 698 699 perf_record_mmap2__read_build_id(&event->mmap2, args->machine, false); 700 } else { 701 size = PERF_ALIGN(dso->long_name_len + 1, sizeof(u64)); 702 event->mmap.header.type = PERF_RECORD_MMAP; 703 event->mmap.header.size = (sizeof(event->mmap) - 704 (sizeof(event->mmap.filename) - size)); 705 memset(event->mmap.filename + size, 0, args->machine->id_hdr_size); 706 event->mmap.header.size += args->machine->id_hdr_size; 707 event->mmap.start = map__start(map); 708 event->mmap.len = map__size(map); 709 event->mmap.pid = args->machine->pid; 710 711 memcpy(event->mmap.filename, dso->long_name, dso->long_name_len + 1); 712 } 713 714 if (perf_tool__process_synth_event(args->tool, event, args->machine, args->process) != 0) 715 return -1; 716 717 return 0; 718} 719 720int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 721 struct machine *machine) 722{ 723 int rc; 724 struct maps *maps = machine__kernel_maps(machine); 725 struct perf_event__synthesize_modules_maps_cb_args args = { 726 .tool = tool, 727 .process = process, 728 .machine = machine, 729 }; 730 size_t size = symbol_conf.buildid_mmap2 731 ? sizeof(args.event->mmap2) 732 : sizeof(args.event->mmap); 733 734 args.event = zalloc(size + machine->id_hdr_size); 735 if (args.event == NULL) { 736 pr_debug("Not enough memory synthesizing mmap event " 737 "for kernel modules\n"); 738 return -1; 739 } 740 741 /* 742 * kernel uses 0 for user space maps, see kernel/perf_event.c 743 * __perf_event_mmap 744 */ 745 if (machine__is_host(machine)) 746 args.event->header.misc = PERF_RECORD_MISC_KERNEL; 747 else 748 args.event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 749 750 rc = maps__for_each_map(maps, perf_event__synthesize_modules_maps_cb, &args); 751 752 free(args.event); 753 return rc; 754} 755 756static int filter_task(const struct dirent *dirent) 757{ 758 return isdigit(dirent->d_name[0]); 759} 760 761static int __event__synthesize_thread(union perf_event *comm_event, 762 union perf_event *mmap_event, 763 union perf_event *fork_event, 764 union perf_event *namespaces_event, 765 pid_t pid, int full, perf_event__handler_t process, 766 struct perf_tool *tool, struct machine *machine, 767 bool needs_mmap, bool mmap_data) 768{ 769 char filename[PATH_MAX]; 770 struct dirent **dirent; 771 pid_t tgid, ppid; 772 int rc = 0; 773 int i, n; 774 775 /* special case: only send one comm event using passed in pid */ 776 if (!full) { 777 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 778 process, machine); 779 780 if (tgid == -1) 781 return -1; 782 783 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 784 tgid, process, machine) < 0) 785 return -1; 786 787 /* 788 * send mmap only for thread group leader 789 * see thread__init_maps() 790 */ 791 if (pid == tgid && needs_mmap && 792 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 793 process, machine, mmap_data)) 794 return -1; 795 796 return 0; 797 } 798 799 if (machine__is_default_guest(machine)) 800 return 0; 801 802 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 803 machine->root_dir, pid); 804 805 n = scandir(filename, &dirent, filter_task, NULL); 806 if (n < 0) 807 return n; 808 809 for (i = 0; i < n; i++) { 810 char *end; 811 pid_t _pid; 812 bool kernel_thread = false; 813 814 _pid = strtol(dirent[i]->d_name, &end, 10); 815 if (*end) 816 continue; 817 818 /* some threads may exit just after scan, ignore it */ 819 if (perf_event__prepare_comm(comm_event, pid, _pid, machine, 820 &tgid, &ppid, &kernel_thread) != 0) 821 continue; 822 823 rc = -1; 824 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 825 ppid, process, machine) < 0) 826 break; 827 828 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 829 tgid, process, machine) < 0) 830 break; 831 832 /* 833 * Send the prepared comm event 834 */ 835 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 836 break; 837 838 rc = 0; 839 if (_pid == pid && !kernel_thread && needs_mmap) { 840 /* process the parent's maps too */ 841 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 842 process, machine, mmap_data); 843 if (rc) 844 break; 845 } 846 } 847 848 for (i = 0; i < n; i++) 849 zfree(&dirent[i]); 850 free(dirent); 851 852 return rc; 853} 854 855int perf_event__synthesize_thread_map(struct perf_tool *tool, 856 struct perf_thread_map *threads, 857 perf_event__handler_t process, 858 struct machine *machine, 859 bool needs_mmap, bool mmap_data) 860{ 861 union perf_event *comm_event, *mmap_event, *fork_event; 862 union perf_event *namespaces_event; 863 int err = -1, thread, j; 864 865 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 866 if (comm_event == NULL) 867 goto out; 868 869 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 870 if (mmap_event == NULL) 871 goto out_free_comm; 872 873 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 874 if (fork_event == NULL) 875 goto out_free_mmap; 876 877 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 878 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 879 machine->id_hdr_size); 880 if (namespaces_event == NULL) 881 goto out_free_fork; 882 883 err = 0; 884 for (thread = 0; thread < threads->nr; ++thread) { 885 if (__event__synthesize_thread(comm_event, mmap_event, 886 fork_event, namespaces_event, 887 perf_thread_map__pid(threads, thread), 0, 888 process, tool, machine, 889 needs_mmap, mmap_data)) { 890 err = -1; 891 break; 892 } 893 894 /* 895 * comm.pid is set to thread group id by 896 * perf_event__synthesize_comm 897 */ 898 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 899 bool need_leader = true; 900 901 /* is thread group leader in thread_map? */ 902 for (j = 0; j < threads->nr; ++j) { 903 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 904 need_leader = false; 905 break; 906 } 907 } 908 909 /* if not, generate events for it */ 910 if (need_leader && 911 __event__synthesize_thread(comm_event, mmap_event, 912 fork_event, namespaces_event, 913 comm_event->comm.pid, 0, 914 process, tool, machine, 915 needs_mmap, mmap_data)) { 916 err = -1; 917 break; 918 } 919 } 920 } 921 free(namespaces_event); 922out_free_fork: 923 free(fork_event); 924out_free_mmap: 925 free(mmap_event); 926out_free_comm: 927 free(comm_event); 928out: 929 return err; 930} 931 932static int __perf_event__synthesize_threads(struct perf_tool *tool, 933 perf_event__handler_t process, 934 struct machine *machine, 935 bool needs_mmap, 936 bool mmap_data, 937 struct dirent **dirent, 938 int start, 939 int num) 940{ 941 union perf_event *comm_event, *mmap_event, *fork_event; 942 union perf_event *namespaces_event; 943 int err = -1; 944 char *end; 945 pid_t pid; 946 int i; 947 948 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 949 if (comm_event == NULL) 950 goto out; 951 952 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 953 if (mmap_event == NULL) 954 goto out_free_comm; 955 956 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 957 if (fork_event == NULL) 958 goto out_free_mmap; 959 960 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 961 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 962 machine->id_hdr_size); 963 if (namespaces_event == NULL) 964 goto out_free_fork; 965 966 for (i = start; i < start + num; i++) { 967 if (!isdigit(dirent[i]->d_name[0])) 968 continue; 969 970 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 971 /* only interested in proper numerical dirents */ 972 if (*end) 973 continue; 974 /* 975 * We may race with exiting thread, so don't stop just because 976 * one thread couldn't be synthesized. 977 */ 978 __event__synthesize_thread(comm_event, mmap_event, fork_event, 979 namespaces_event, pid, 1, process, 980 tool, machine, needs_mmap, mmap_data); 981 } 982 err = 0; 983 984 free(namespaces_event); 985out_free_fork: 986 free(fork_event); 987out_free_mmap: 988 free(mmap_event); 989out_free_comm: 990 free(comm_event); 991out: 992 return err; 993} 994 995struct synthesize_threads_arg { 996 struct perf_tool *tool; 997 perf_event__handler_t process; 998 struct machine *machine; 999 bool needs_mmap; 1000 bool mmap_data; 1001 struct dirent **dirent; 1002 int num; 1003 int start; 1004}; 1005 1006static void *synthesize_threads_worker(void *arg) 1007{ 1008 struct synthesize_threads_arg *args = arg; 1009 1010 __perf_event__synthesize_threads(args->tool, args->process, 1011 args->machine, 1012 args->needs_mmap, args->mmap_data, 1013 args->dirent, 1014 args->start, args->num); 1015 return NULL; 1016} 1017 1018int perf_event__synthesize_threads(struct perf_tool *tool, 1019 perf_event__handler_t process, 1020 struct machine *machine, 1021 bool needs_mmap, bool mmap_data, 1022 unsigned int nr_threads_synthesize) 1023{ 1024 struct synthesize_threads_arg *args = NULL; 1025 pthread_t *synthesize_threads = NULL; 1026 char proc_path[PATH_MAX]; 1027 struct dirent **dirent; 1028 int num_per_thread; 1029 int m, n, i, j; 1030 int thread_nr; 1031 int base = 0; 1032 int err = -1; 1033 1034 1035 if (machine__is_default_guest(machine)) 1036 return 0; 1037 1038 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 1039 n = scandir(proc_path, &dirent, filter_task, NULL); 1040 if (n < 0) 1041 return err; 1042 1043 if (nr_threads_synthesize == UINT_MAX) 1044 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 1045 else 1046 thread_nr = nr_threads_synthesize; 1047 1048 if (thread_nr <= 1) { 1049 err = __perf_event__synthesize_threads(tool, process, 1050 machine, 1051 needs_mmap, mmap_data, 1052 dirent, base, n); 1053 goto free_dirent; 1054 } 1055 if (thread_nr > n) 1056 thread_nr = n; 1057 1058 synthesize_threads = calloc(thread_nr, sizeof(pthread_t)); 1059 if (synthesize_threads == NULL) 1060 goto free_dirent; 1061 1062 args = calloc(thread_nr, sizeof(*args)); 1063 if (args == NULL) 1064 goto free_threads; 1065 1066 num_per_thread = n / thread_nr; 1067 m = n % thread_nr; 1068 for (i = 0; i < thread_nr; i++) { 1069 args[i].tool = tool; 1070 args[i].process = process; 1071 args[i].machine = machine; 1072 args[i].needs_mmap = needs_mmap; 1073 args[i].mmap_data = mmap_data; 1074 args[i].dirent = dirent; 1075 } 1076 for (i = 0; i < m; i++) { 1077 args[i].num = num_per_thread + 1; 1078 args[i].start = i * args[i].num; 1079 } 1080 if (i != 0) 1081 base = args[i-1].start + args[i-1].num; 1082 for (j = i; j < thread_nr; j++) { 1083 args[j].num = num_per_thread; 1084 args[j].start = base + (j - i) * args[i].num; 1085 } 1086 1087 for (i = 0; i < thread_nr; i++) { 1088 if (pthread_create(&synthesize_threads[i], NULL, 1089 synthesize_threads_worker, &args[i])) 1090 goto out_join; 1091 } 1092 err = 0; 1093out_join: 1094 for (i = 0; i < thread_nr; i++) 1095 pthread_join(synthesize_threads[i], NULL); 1096 free(args); 1097free_threads: 1098 free(synthesize_threads); 1099free_dirent: 1100 for (i = 0; i < n; i++) 1101 zfree(&dirent[i]); 1102 free(dirent); 1103 1104 return err; 1105} 1106 1107int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 1108 perf_event__handler_t process __maybe_unused, 1109 struct machine *machine __maybe_unused) 1110{ 1111 return 0; 1112} 1113 1114static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1115 perf_event__handler_t process, 1116 struct machine *machine) 1117{ 1118 union perf_event *event; 1119 size_t size = symbol_conf.buildid_mmap2 ? 1120 sizeof(event->mmap2) : sizeof(event->mmap); 1121 struct map *map = machine__kernel_map(machine); 1122 struct kmap *kmap; 1123 int err; 1124 1125 if (map == NULL) 1126 return -1; 1127 1128 kmap = map__kmap(map); 1129 if (!kmap->ref_reloc_sym) 1130 return -1; 1131 1132 /* 1133 * We should get this from /sys/kernel/sections/.text, but till that is 1134 * available use this, and after it is use this as a fallback for older 1135 * kernels. 1136 */ 1137 event = zalloc(size + machine->id_hdr_size); 1138 if (event == NULL) { 1139 pr_debug("Not enough memory synthesizing mmap event " 1140 "for kernel modules\n"); 1141 return -1; 1142 } 1143 1144 if (machine__is_host(machine)) { 1145 /* 1146 * kernel uses PERF_RECORD_MISC_USER for user space maps, 1147 * see kernel/perf_event.c __perf_event_mmap 1148 */ 1149 event->header.misc = PERF_RECORD_MISC_KERNEL; 1150 } else { 1151 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 1152 } 1153 1154 if (symbol_conf.buildid_mmap2) { 1155 size = snprintf(event->mmap2.filename, sizeof(event->mmap2.filename), 1156 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1157 size = PERF_ALIGN(size, sizeof(u64)); 1158 event->mmap2.header.type = PERF_RECORD_MMAP2; 1159 event->mmap2.header.size = (sizeof(event->mmap2) - 1160 (sizeof(event->mmap2.filename) - size) + machine->id_hdr_size); 1161 event->mmap2.pgoff = kmap->ref_reloc_sym->addr; 1162 event->mmap2.start = map__start(map); 1163 event->mmap2.len = map__end(map) - event->mmap.start; 1164 event->mmap2.pid = machine->pid; 1165 1166 perf_record_mmap2__read_build_id(&event->mmap2, machine, true); 1167 } else { 1168 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 1169 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1170 size = PERF_ALIGN(size, sizeof(u64)); 1171 event->mmap.header.type = PERF_RECORD_MMAP; 1172 event->mmap.header.size = (sizeof(event->mmap) - 1173 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 1174 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 1175 event->mmap.start = map__start(map); 1176 event->mmap.len = map__end(map) - event->mmap.start; 1177 event->mmap.pid = machine->pid; 1178 } 1179 1180 err = perf_tool__process_synth_event(tool, event, machine, process); 1181 free(event); 1182 1183 return err; 1184} 1185 1186int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1187 perf_event__handler_t process, 1188 struct machine *machine) 1189{ 1190 int err; 1191 1192 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 1193 if (err < 0) 1194 return err; 1195 1196 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1197} 1198 1199int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1200 struct perf_thread_map *threads, 1201 perf_event__handler_t process, 1202 struct machine *machine) 1203{ 1204 union perf_event *event; 1205 int i, err, size; 1206 1207 size = sizeof(event->thread_map); 1208 size += threads->nr * sizeof(event->thread_map.entries[0]); 1209 1210 event = zalloc(size); 1211 if (!event) 1212 return -ENOMEM; 1213 1214 event->header.type = PERF_RECORD_THREAD_MAP; 1215 event->header.size = size; 1216 event->thread_map.nr = threads->nr; 1217 1218 for (i = 0; i < threads->nr; i++) { 1219 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1220 char *comm = perf_thread_map__comm(threads, i); 1221 1222 if (!comm) 1223 comm = (char *) ""; 1224 1225 entry->pid = perf_thread_map__pid(threads, i); 1226 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1227 } 1228 1229 err = process(tool, event, NULL, machine); 1230 1231 free(event); 1232 return err; 1233} 1234 1235struct synthesize_cpu_map_data { 1236 const struct perf_cpu_map *map; 1237 int nr; 1238 int min_cpu; 1239 int max_cpu; 1240 int has_any_cpu; 1241 int type; 1242 size_t size; 1243 struct perf_record_cpu_map_data *data; 1244}; 1245 1246static void synthesize_cpus(struct synthesize_cpu_map_data *data) 1247{ 1248 data->data->type = PERF_CPU_MAP__CPUS; 1249 data->data->cpus_data.nr = data->nr; 1250 for (int i = 0; i < data->nr; i++) 1251 data->data->cpus_data.cpu[i] = perf_cpu_map__cpu(data->map, i).cpu; 1252} 1253 1254static void synthesize_mask(struct synthesize_cpu_map_data *data) 1255{ 1256 int idx; 1257 struct perf_cpu cpu; 1258 1259 /* Due to padding, the 4bytes per entry mask variant is always smaller. */ 1260 data->data->type = PERF_CPU_MAP__MASK; 1261 data->data->mask32_data.nr = BITS_TO_U32(data->max_cpu); 1262 data->data->mask32_data.long_size = 4; 1263 1264 perf_cpu_map__for_each_cpu(cpu, idx, data->map) { 1265 int bit_word = cpu.cpu / 32; 1266 u32 bit_mask = 1U << (cpu.cpu & 31); 1267 1268 data->data->mask32_data.mask[bit_word] |= bit_mask; 1269 } 1270} 1271 1272static void synthesize_range_cpus(struct synthesize_cpu_map_data *data) 1273{ 1274 data->data->type = PERF_CPU_MAP__RANGE_CPUS; 1275 data->data->range_cpu_data.any_cpu = data->has_any_cpu; 1276 data->data->range_cpu_data.start_cpu = data->min_cpu; 1277 data->data->range_cpu_data.end_cpu = data->max_cpu; 1278} 1279 1280static void *cpu_map_data__alloc(struct synthesize_cpu_map_data *syn_data, 1281 size_t header_size) 1282{ 1283 size_t size_cpus, size_mask; 1284 1285 syn_data->nr = perf_cpu_map__nr(syn_data->map); 1286 syn_data->has_any_cpu = (perf_cpu_map__cpu(syn_data->map, 0).cpu == -1) ? 1 : 0; 1287 1288 syn_data->min_cpu = perf_cpu_map__cpu(syn_data->map, syn_data->has_any_cpu).cpu; 1289 syn_data->max_cpu = perf_cpu_map__max(syn_data->map).cpu; 1290 if (syn_data->max_cpu - syn_data->min_cpu + 1 == syn_data->nr - syn_data->has_any_cpu) { 1291 /* A consecutive range of CPUs can be encoded using a range. */ 1292 assert(sizeof(u16) + sizeof(struct perf_record_range_cpu_map) == sizeof(u64)); 1293 syn_data->type = PERF_CPU_MAP__RANGE_CPUS; 1294 syn_data->size = header_size + sizeof(u64); 1295 return zalloc(syn_data->size); 1296 } 1297 1298 size_cpus = sizeof(u16) + sizeof(struct cpu_map_entries) + syn_data->nr * sizeof(u16); 1299 /* Due to padding, the 4bytes per entry mask variant is always smaller. */ 1300 size_mask = sizeof(u16) + sizeof(struct perf_record_mask_cpu_map32) + 1301 BITS_TO_U32(syn_data->max_cpu) * sizeof(__u32); 1302 if (syn_data->has_any_cpu || size_cpus < size_mask) { 1303 /* Follow the CPU map encoding. */ 1304 syn_data->type = PERF_CPU_MAP__CPUS; 1305 syn_data->size = header_size + PERF_ALIGN(size_cpus, sizeof(u64)); 1306 return zalloc(syn_data->size); 1307 } 1308 /* Encode using a bitmask. */ 1309 syn_data->type = PERF_CPU_MAP__MASK; 1310 syn_data->size = header_size + PERF_ALIGN(size_mask, sizeof(u64)); 1311 return zalloc(syn_data->size); 1312} 1313 1314static void cpu_map_data__synthesize(struct synthesize_cpu_map_data *data) 1315{ 1316 switch (data->type) { 1317 case PERF_CPU_MAP__CPUS: 1318 synthesize_cpus(data); 1319 break; 1320 case PERF_CPU_MAP__MASK: 1321 synthesize_mask(data); 1322 break; 1323 case PERF_CPU_MAP__RANGE_CPUS: 1324 synthesize_range_cpus(data); 1325 break; 1326 default: 1327 break; 1328 } 1329} 1330 1331static struct perf_record_cpu_map *cpu_map_event__new(const struct perf_cpu_map *map) 1332{ 1333 struct synthesize_cpu_map_data syn_data = { .map = map }; 1334 struct perf_record_cpu_map *event; 1335 1336 1337 event = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header)); 1338 if (!event) 1339 return NULL; 1340 1341 syn_data.data = &event->data; 1342 event->header.type = PERF_RECORD_CPU_MAP; 1343 event->header.size = syn_data.size; 1344 cpu_map_data__synthesize(&syn_data); 1345 return event; 1346} 1347 1348 1349int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1350 const struct perf_cpu_map *map, 1351 perf_event__handler_t process, 1352 struct machine *machine) 1353{ 1354 struct perf_record_cpu_map *event; 1355 int err; 1356 1357 event = cpu_map_event__new(map); 1358 if (!event) 1359 return -ENOMEM; 1360 1361 err = process(tool, (union perf_event *) event, NULL, machine); 1362 1363 free(event); 1364 return err; 1365} 1366 1367int perf_event__synthesize_stat_config(struct perf_tool *tool, 1368 struct perf_stat_config *config, 1369 perf_event__handler_t process, 1370 struct machine *machine) 1371{ 1372 struct perf_record_stat_config *event; 1373 int size, i = 0, err; 1374 1375 size = sizeof(*event); 1376 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1377 1378 event = zalloc(size); 1379 if (!event) 1380 return -ENOMEM; 1381 1382 event->header.type = PERF_RECORD_STAT_CONFIG; 1383 event->header.size = size; 1384 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1385 1386#define ADD(__term, __val) \ 1387 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1388 event->data[i].val = __val; \ 1389 i++; 1390 1391 ADD(AGGR_MODE, config->aggr_mode) 1392 ADD(INTERVAL, config->interval) 1393 ADD(SCALE, config->scale) 1394 ADD(AGGR_LEVEL, config->aggr_level) 1395 1396 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1397 "stat config terms unbalanced\n"); 1398#undef ADD 1399 1400 err = process(tool, (union perf_event *) event, NULL, machine); 1401 1402 free(event); 1403 return err; 1404} 1405 1406int perf_event__synthesize_stat(struct perf_tool *tool, 1407 struct perf_cpu cpu, u32 thread, u64 id, 1408 struct perf_counts_values *count, 1409 perf_event__handler_t process, 1410 struct machine *machine) 1411{ 1412 struct perf_record_stat event; 1413 1414 event.header.type = PERF_RECORD_STAT; 1415 event.header.size = sizeof(event); 1416 event.header.misc = 0; 1417 1418 event.id = id; 1419 event.cpu = cpu.cpu; 1420 event.thread = thread; 1421 event.val = count->val; 1422 event.ena = count->ena; 1423 event.run = count->run; 1424 1425 return process(tool, (union perf_event *) &event, NULL, machine); 1426} 1427 1428int perf_event__synthesize_stat_round(struct perf_tool *tool, 1429 u64 evtime, u64 type, 1430 perf_event__handler_t process, 1431 struct machine *machine) 1432{ 1433 struct perf_record_stat_round event; 1434 1435 event.header.type = PERF_RECORD_STAT_ROUND; 1436 event.header.size = sizeof(event); 1437 event.header.misc = 0; 1438 1439 event.time = evtime; 1440 event.type = type; 1441 1442 return process(tool, (union perf_event *) &event, NULL, machine); 1443} 1444 1445size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1446{ 1447 size_t sz, result = sizeof(struct perf_record_sample); 1448 1449 if (type & PERF_SAMPLE_IDENTIFIER) 1450 result += sizeof(u64); 1451 1452 if (type & PERF_SAMPLE_IP) 1453 result += sizeof(u64); 1454 1455 if (type & PERF_SAMPLE_TID) 1456 result += sizeof(u64); 1457 1458 if (type & PERF_SAMPLE_TIME) 1459 result += sizeof(u64); 1460 1461 if (type & PERF_SAMPLE_ADDR) 1462 result += sizeof(u64); 1463 1464 if (type & PERF_SAMPLE_ID) 1465 result += sizeof(u64); 1466 1467 if (type & PERF_SAMPLE_STREAM_ID) 1468 result += sizeof(u64); 1469 1470 if (type & PERF_SAMPLE_CPU) 1471 result += sizeof(u64); 1472 1473 if (type & PERF_SAMPLE_PERIOD) 1474 result += sizeof(u64); 1475 1476 if (type & PERF_SAMPLE_READ) { 1477 result += sizeof(u64); 1478 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1479 result += sizeof(u64); 1480 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1481 result += sizeof(u64); 1482 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1483 if (read_format & PERF_FORMAT_GROUP) { 1484 sz = sample_read_value_size(read_format); 1485 result += sz * sample->read.group.nr; 1486 } else { 1487 result += sizeof(u64); 1488 if (read_format & PERF_FORMAT_LOST) 1489 result += sizeof(u64); 1490 } 1491 } 1492 1493 if (type & PERF_SAMPLE_CALLCHAIN) { 1494 sz = (sample->callchain->nr + 1) * sizeof(u64); 1495 result += sz; 1496 } 1497 1498 if (type & PERF_SAMPLE_RAW) { 1499 result += sizeof(u32); 1500 result += sample->raw_size; 1501 } 1502 1503 if (type & PERF_SAMPLE_BRANCH_STACK) { 1504 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1505 /* nr, hw_idx */ 1506 sz += 2 * sizeof(u64); 1507 result += sz; 1508 } 1509 1510 if (type & PERF_SAMPLE_REGS_USER) { 1511 if (sample->user_regs.abi) { 1512 result += sizeof(u64); 1513 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1514 result += sz; 1515 } else { 1516 result += sizeof(u64); 1517 } 1518 } 1519 1520 if (type & PERF_SAMPLE_STACK_USER) { 1521 sz = sample->user_stack.size; 1522 result += sizeof(u64); 1523 if (sz) { 1524 result += sz; 1525 result += sizeof(u64); 1526 } 1527 } 1528 1529 if (type & PERF_SAMPLE_WEIGHT_TYPE) 1530 result += sizeof(u64); 1531 1532 if (type & PERF_SAMPLE_DATA_SRC) 1533 result += sizeof(u64); 1534 1535 if (type & PERF_SAMPLE_TRANSACTION) 1536 result += sizeof(u64); 1537 1538 if (type & PERF_SAMPLE_REGS_INTR) { 1539 if (sample->intr_regs.abi) { 1540 result += sizeof(u64); 1541 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1542 result += sz; 1543 } else { 1544 result += sizeof(u64); 1545 } 1546 } 1547 1548 if (type & PERF_SAMPLE_PHYS_ADDR) 1549 result += sizeof(u64); 1550 1551 if (type & PERF_SAMPLE_CGROUP) 1552 result += sizeof(u64); 1553 1554 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) 1555 result += sizeof(u64); 1556 1557 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) 1558 result += sizeof(u64); 1559 1560 if (type & PERF_SAMPLE_AUX) { 1561 result += sizeof(u64); 1562 result += sample->aux_sample.size; 1563 } 1564 1565 return result; 1566} 1567 1568void __weak arch_perf_synthesize_sample_weight(const struct perf_sample *data, 1569 __u64 *array, u64 type __maybe_unused) 1570{ 1571 *array = data->weight; 1572} 1573 1574static __u64 *copy_read_group_values(__u64 *array, __u64 read_format, 1575 const struct perf_sample *sample) 1576{ 1577 size_t sz = sample_read_value_size(read_format); 1578 struct sample_read_value *v = sample->read.group.values; 1579 1580 sample_read_group__for_each(v, sample->read.group.nr, read_format) { 1581 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1582 memcpy(array, v, sz); 1583 array = (void *)array + sz; 1584 } 1585 return array; 1586} 1587 1588int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1589 const struct perf_sample *sample) 1590{ 1591 __u64 *array; 1592 size_t sz; 1593 /* 1594 * used for cross-endian analysis. See git commit 65014ab3 1595 * for why this goofiness is needed. 1596 */ 1597 union u64_swap u; 1598 1599 array = event->sample.array; 1600 1601 if (type & PERF_SAMPLE_IDENTIFIER) { 1602 *array = sample->id; 1603 array++; 1604 } 1605 1606 if (type & PERF_SAMPLE_IP) { 1607 *array = sample->ip; 1608 array++; 1609 } 1610 1611 if (type & PERF_SAMPLE_TID) { 1612 u.val32[0] = sample->pid; 1613 u.val32[1] = sample->tid; 1614 *array = u.val64; 1615 array++; 1616 } 1617 1618 if (type & PERF_SAMPLE_TIME) { 1619 *array = sample->time; 1620 array++; 1621 } 1622 1623 if (type & PERF_SAMPLE_ADDR) { 1624 *array = sample->addr; 1625 array++; 1626 } 1627 1628 if (type & PERF_SAMPLE_ID) { 1629 *array = sample->id; 1630 array++; 1631 } 1632 1633 if (type & PERF_SAMPLE_STREAM_ID) { 1634 *array = sample->stream_id; 1635 array++; 1636 } 1637 1638 if (type & PERF_SAMPLE_CPU) { 1639 u.val32[0] = sample->cpu; 1640 u.val32[1] = 0; 1641 *array = u.val64; 1642 array++; 1643 } 1644 1645 if (type & PERF_SAMPLE_PERIOD) { 1646 *array = sample->period; 1647 array++; 1648 } 1649 1650 if (type & PERF_SAMPLE_READ) { 1651 if (read_format & PERF_FORMAT_GROUP) 1652 *array = sample->read.group.nr; 1653 else 1654 *array = sample->read.one.value; 1655 array++; 1656 1657 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1658 *array = sample->read.time_enabled; 1659 array++; 1660 } 1661 1662 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1663 *array = sample->read.time_running; 1664 array++; 1665 } 1666 1667 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1668 if (read_format & PERF_FORMAT_GROUP) { 1669 array = copy_read_group_values(array, read_format, 1670 sample); 1671 } else { 1672 *array = sample->read.one.id; 1673 array++; 1674 1675 if (read_format & PERF_FORMAT_LOST) { 1676 *array = sample->read.one.lost; 1677 array++; 1678 } 1679 } 1680 } 1681 1682 if (type & PERF_SAMPLE_CALLCHAIN) { 1683 sz = (sample->callchain->nr + 1) * sizeof(u64); 1684 memcpy(array, sample->callchain, sz); 1685 array = (void *)array + sz; 1686 } 1687 1688 if (type & PERF_SAMPLE_RAW) { 1689 u.val32[0] = sample->raw_size; 1690 *array = u.val64; 1691 array = (void *)array + sizeof(u32); 1692 1693 memcpy(array, sample->raw_data, sample->raw_size); 1694 array = (void *)array + sample->raw_size; 1695 } 1696 1697 if (type & PERF_SAMPLE_BRANCH_STACK) { 1698 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1699 /* nr, hw_idx */ 1700 sz += 2 * sizeof(u64); 1701 memcpy(array, sample->branch_stack, sz); 1702 array = (void *)array + sz; 1703 } 1704 1705 if (type & PERF_SAMPLE_REGS_USER) { 1706 if (sample->user_regs.abi) { 1707 *array++ = sample->user_regs.abi; 1708 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1709 memcpy(array, sample->user_regs.regs, sz); 1710 array = (void *)array + sz; 1711 } else { 1712 *array++ = 0; 1713 } 1714 } 1715 1716 if (type & PERF_SAMPLE_STACK_USER) { 1717 sz = sample->user_stack.size; 1718 *array++ = sz; 1719 if (sz) { 1720 memcpy(array, sample->user_stack.data, sz); 1721 array = (void *)array + sz; 1722 *array++ = sz; 1723 } 1724 } 1725 1726 if (type & PERF_SAMPLE_WEIGHT_TYPE) { 1727 arch_perf_synthesize_sample_weight(sample, array, type); 1728 array++; 1729 } 1730 1731 if (type & PERF_SAMPLE_DATA_SRC) { 1732 *array = sample->data_src; 1733 array++; 1734 } 1735 1736 if (type & PERF_SAMPLE_TRANSACTION) { 1737 *array = sample->transaction; 1738 array++; 1739 } 1740 1741 if (type & PERF_SAMPLE_REGS_INTR) { 1742 if (sample->intr_regs.abi) { 1743 *array++ = sample->intr_regs.abi; 1744 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1745 memcpy(array, sample->intr_regs.regs, sz); 1746 array = (void *)array + sz; 1747 } else { 1748 *array++ = 0; 1749 } 1750 } 1751 1752 if (type & PERF_SAMPLE_PHYS_ADDR) { 1753 *array = sample->phys_addr; 1754 array++; 1755 } 1756 1757 if (type & PERF_SAMPLE_CGROUP) { 1758 *array = sample->cgroup; 1759 array++; 1760 } 1761 1762 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) { 1763 *array = sample->data_page_size; 1764 array++; 1765 } 1766 1767 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) { 1768 *array = sample->code_page_size; 1769 array++; 1770 } 1771 1772 if (type & PERF_SAMPLE_AUX) { 1773 sz = sample->aux_sample.size; 1774 *array++ = sz; 1775 memcpy(array, sample->aux_sample.data, sz); 1776 array = (void *)array + sz; 1777 } 1778 1779 return 0; 1780} 1781 1782int perf_event__synthesize_id_sample(__u64 *array, u64 type, const struct perf_sample *sample) 1783{ 1784 __u64 *start = array; 1785 1786 /* 1787 * used for cross-endian analysis. See git commit 65014ab3 1788 * for why this goofiness is needed. 1789 */ 1790 union u64_swap u; 1791 1792 if (type & PERF_SAMPLE_TID) { 1793 u.val32[0] = sample->pid; 1794 u.val32[1] = sample->tid; 1795 *array = u.val64; 1796 array++; 1797 } 1798 1799 if (type & PERF_SAMPLE_TIME) { 1800 *array = sample->time; 1801 array++; 1802 } 1803 1804 if (type & PERF_SAMPLE_ID) { 1805 *array = sample->id; 1806 array++; 1807 } 1808 1809 if (type & PERF_SAMPLE_STREAM_ID) { 1810 *array = sample->stream_id; 1811 array++; 1812 } 1813 1814 if (type & PERF_SAMPLE_CPU) { 1815 u.val32[0] = sample->cpu; 1816 u.val32[1] = 0; 1817 *array = u.val64; 1818 array++; 1819 } 1820 1821 if (type & PERF_SAMPLE_IDENTIFIER) { 1822 *array = sample->id; 1823 array++; 1824 } 1825 1826 return (void *)array - (void *)start; 1827} 1828 1829int __perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1830 struct evlist *evlist, struct machine *machine, size_t from) 1831{ 1832 union perf_event *ev; 1833 struct evsel *evsel; 1834 size_t nr = 0, i = 0, sz, max_nr, n, pos; 1835 size_t e1_sz = sizeof(struct id_index_entry); 1836 size_t e2_sz = sizeof(struct id_index_entry_2); 1837 size_t etot_sz = e1_sz + e2_sz; 1838 bool e2_needed = false; 1839 int err; 1840 1841 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / etot_sz; 1842 1843 pos = 0; 1844 evlist__for_each_entry(evlist, evsel) { 1845 if (pos++ < from) 1846 continue; 1847 nr += evsel->core.ids; 1848 } 1849 1850 if (!nr) 1851 return 0; 1852 1853 pr_debug2("Synthesizing id index\n"); 1854 1855 n = nr > max_nr ? max_nr : nr; 1856 sz = sizeof(struct perf_record_id_index) + n * etot_sz; 1857 ev = zalloc(sz); 1858 if (!ev) 1859 return -ENOMEM; 1860 1861 sz = sizeof(struct perf_record_id_index) + n * e1_sz; 1862 1863 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1864 ev->id_index.nr = n; 1865 1866 pos = 0; 1867 evlist__for_each_entry(evlist, evsel) { 1868 u32 j; 1869 1870 if (pos++ < from) 1871 continue; 1872 for (j = 0; j < evsel->core.ids; j++, i++) { 1873 struct id_index_entry *e; 1874 struct id_index_entry_2 *e2; 1875 struct perf_sample_id *sid; 1876 1877 if (i >= n) { 1878 ev->id_index.header.size = sz + (e2_needed ? n * e2_sz : 0); 1879 err = process(tool, ev, NULL, machine); 1880 if (err) 1881 goto out_err; 1882 nr -= n; 1883 i = 0; 1884 e2_needed = false; 1885 } 1886 1887 e = &ev->id_index.entries[i]; 1888 1889 e->id = evsel->core.id[j]; 1890 1891 sid = evlist__id2sid(evlist, e->id); 1892 if (!sid) { 1893 free(ev); 1894 return -ENOENT; 1895 } 1896 1897 e->idx = sid->idx; 1898 e->cpu = sid->cpu.cpu; 1899 e->tid = sid->tid; 1900 1901 if (sid->machine_pid) 1902 e2_needed = true; 1903 1904 e2 = (void *)ev + sz; 1905 e2[i].machine_pid = sid->machine_pid; 1906 e2[i].vcpu = sid->vcpu.cpu; 1907 } 1908 } 1909 1910 sz = sizeof(struct perf_record_id_index) + nr * e1_sz; 1911 ev->id_index.header.size = sz + (e2_needed ? nr * e2_sz : 0); 1912 ev->id_index.nr = nr; 1913 1914 err = process(tool, ev, NULL, machine); 1915out_err: 1916 free(ev); 1917 1918 return err; 1919} 1920 1921int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1922 struct evlist *evlist, struct machine *machine) 1923{ 1924 return __perf_event__synthesize_id_index(tool, process, evlist, machine, 0); 1925} 1926 1927int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1928 struct target *target, struct perf_thread_map *threads, 1929 perf_event__handler_t process, bool needs_mmap, 1930 bool data_mmap, unsigned int nr_threads_synthesize) 1931{ 1932 /* 1933 * When perf runs in non-root PID namespace, and the namespace's proc FS 1934 * is not mounted, nsinfo__is_in_root_namespace() returns false. 1935 * In this case, the proc FS is coming for the parent namespace, thus 1936 * perf tool will wrongly gather process info from its parent PID 1937 * namespace. 1938 * 1939 * To avoid the confusion that the perf tool runs in a child PID 1940 * namespace but it synthesizes thread info from its parent PID 1941 * namespace, returns failure with warning. 1942 */ 1943 if (!nsinfo__is_in_root_namespace()) { 1944 pr_err("Perf runs in non-root PID namespace but it tries to "); 1945 pr_err("gather process info from its parent PID namespace.\n"); 1946 pr_err("Please mount the proc file system properly, e.g. "); 1947 pr_err("add the option '--mount-proc' for unshare command.\n"); 1948 return -EPERM; 1949 } 1950 1951 if (target__has_task(target)) 1952 return perf_event__synthesize_thread_map(tool, threads, process, machine, 1953 needs_mmap, data_mmap); 1954 else if (target__has_cpu(target)) 1955 return perf_event__synthesize_threads(tool, process, machine, 1956 needs_mmap, data_mmap, 1957 nr_threads_synthesize); 1958 /* command specified */ 1959 return 0; 1960} 1961 1962int machine__synthesize_threads(struct machine *machine, struct target *target, 1963 struct perf_thread_map *threads, bool needs_mmap, 1964 bool data_mmap, unsigned int nr_threads_synthesize) 1965{ 1966 return __machine__synthesize_threads(machine, NULL, target, threads, 1967 perf_event__process, needs_mmap, 1968 data_mmap, nr_threads_synthesize); 1969} 1970 1971static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1972{ 1973 struct perf_record_event_update *ev; 1974 1975 size += sizeof(*ev); 1976 size = PERF_ALIGN(size, sizeof(u64)); 1977 1978 ev = zalloc(size); 1979 if (ev) { 1980 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1981 ev->header.size = (u16)size; 1982 ev->type = type; 1983 ev->id = id; 1984 } 1985 return ev; 1986} 1987 1988int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1989 perf_event__handler_t process) 1990{ 1991 size_t size = strlen(evsel->unit); 1992 struct perf_record_event_update *ev; 1993 int err; 1994 1995 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1996 if (ev == NULL) 1997 return -ENOMEM; 1998 1999 strlcpy(ev->unit, evsel->unit, size + 1); 2000 err = process(tool, (union perf_event *)ev, NULL, NULL); 2001 free(ev); 2002 return err; 2003} 2004 2005int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 2006 perf_event__handler_t process) 2007{ 2008 struct perf_record_event_update *ev; 2009 struct perf_record_event_update_scale *ev_data; 2010 int err; 2011 2012 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 2013 if (ev == NULL) 2014 return -ENOMEM; 2015 2016 ev->scale.scale = evsel->scale; 2017 err = process(tool, (union perf_event *)ev, NULL, NULL); 2018 free(ev); 2019 return err; 2020} 2021 2022int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 2023 perf_event__handler_t process) 2024{ 2025 struct perf_record_event_update *ev; 2026 size_t len = strlen(evsel__name(evsel)); 2027 int err; 2028 2029 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 2030 if (ev == NULL) 2031 return -ENOMEM; 2032 2033 strlcpy(ev->name, evsel->name, len + 1); 2034 err = process(tool, (union perf_event *)ev, NULL, NULL); 2035 free(ev); 2036 return err; 2037} 2038 2039int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 2040 perf_event__handler_t process) 2041{ 2042 struct synthesize_cpu_map_data syn_data = { .map = evsel->core.own_cpus }; 2043 struct perf_record_event_update *ev; 2044 int err; 2045 2046 ev = cpu_map_data__alloc(&syn_data, sizeof(struct perf_event_header) + 2 * sizeof(u64)); 2047 if (!ev) 2048 return -ENOMEM; 2049 2050 syn_data.data = &ev->cpus.cpus; 2051 ev->header.type = PERF_RECORD_EVENT_UPDATE; 2052 ev->header.size = (u16)syn_data.size; 2053 ev->type = PERF_EVENT_UPDATE__CPUS; 2054 ev->id = evsel->core.id[0]; 2055 cpu_map_data__synthesize(&syn_data); 2056 2057 err = process(tool, (union perf_event *)ev, NULL, NULL); 2058 free(ev); 2059 return err; 2060} 2061 2062int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 2063 perf_event__handler_t process) 2064{ 2065 struct evsel *evsel; 2066 int err = 0; 2067 2068 evlist__for_each_entry(evlist, evsel) { 2069 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 2070 evsel->core.id, process); 2071 if (err) { 2072 pr_debug("failed to create perf header attribute\n"); 2073 return err; 2074 } 2075 } 2076 2077 return err; 2078} 2079 2080static bool has_unit(struct evsel *evsel) 2081{ 2082 return evsel->unit && *evsel->unit; 2083} 2084 2085static bool has_scale(struct evsel *evsel) 2086{ 2087 return evsel->scale != 1; 2088} 2089 2090int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 2091 perf_event__handler_t process, bool is_pipe) 2092{ 2093 struct evsel *evsel; 2094 int err; 2095 2096 /* 2097 * Synthesize other events stuff not carried within 2098 * attr event - unit, scale, name 2099 */ 2100 evlist__for_each_entry(evsel_list, evsel) { 2101 if (!evsel->supported) 2102 continue; 2103 2104 /* 2105 * Synthesize unit and scale only if it's defined. 2106 */ 2107 if (has_unit(evsel)) { 2108 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 2109 if (err < 0) { 2110 pr_err("Couldn't synthesize evsel unit.\n"); 2111 return err; 2112 } 2113 } 2114 2115 if (has_scale(evsel)) { 2116 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 2117 if (err < 0) { 2118 pr_err("Couldn't synthesize evsel evsel.\n"); 2119 return err; 2120 } 2121 } 2122 2123 if (evsel->core.own_cpus) { 2124 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 2125 if (err < 0) { 2126 pr_err("Couldn't synthesize evsel cpus.\n"); 2127 return err; 2128 } 2129 } 2130 2131 /* 2132 * Name is needed only for pipe output, 2133 * perf.data carries event names. 2134 */ 2135 if (is_pipe) { 2136 err = perf_event__synthesize_event_update_name(tool, evsel, process); 2137 if (err < 0) { 2138 pr_err("Couldn't synthesize evsel name.\n"); 2139 return err; 2140 } 2141 } 2142 } 2143 return 0; 2144} 2145 2146int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 2147 u32 ids, u64 *id, perf_event__handler_t process) 2148{ 2149 union perf_event *ev; 2150 size_t size; 2151 int err; 2152 2153 size = sizeof(struct perf_event_attr); 2154 size = PERF_ALIGN(size, sizeof(u64)); 2155 size += sizeof(struct perf_event_header); 2156 size += ids * sizeof(u64); 2157 2158 ev = zalloc(size); 2159 2160 if (ev == NULL) 2161 return -ENOMEM; 2162 2163 ev->attr.attr = *attr; 2164 memcpy(perf_record_header_attr_id(ev), id, ids * sizeof(u64)); 2165 2166 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 2167 ev->attr.header.size = (u16)size; 2168 2169 if (ev->attr.header.size == size) 2170 err = process(tool, ev, NULL, NULL); 2171 else 2172 err = -E2BIG; 2173 2174 free(ev); 2175 2176 return err; 2177} 2178 2179#ifdef HAVE_LIBTRACEEVENT 2180int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 2181 perf_event__handler_t process) 2182{ 2183 union perf_event ev; 2184 struct tracing_data *tdata; 2185 ssize_t size = 0, aligned_size = 0, padding; 2186 struct feat_fd ff; 2187 2188 /* 2189 * We are going to store the size of the data followed 2190 * by the data contents. Since the fd descriptor is a pipe, 2191 * we cannot seek back to store the size of the data once 2192 * we know it. Instead we: 2193 * 2194 * - write the tracing data to the temp file 2195 * - get/write the data size to pipe 2196 * - write the tracing data from the temp file 2197 * to the pipe 2198 */ 2199 tdata = tracing_data_get(&evlist->core.entries, fd, true); 2200 if (!tdata) 2201 return -1; 2202 2203 memset(&ev, 0, sizeof(ev)); 2204 2205 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 2206 size = tdata->size; 2207 aligned_size = PERF_ALIGN(size, sizeof(u64)); 2208 padding = aligned_size - size; 2209 ev.tracing_data.header.size = sizeof(ev.tracing_data); 2210 ev.tracing_data.size = aligned_size; 2211 2212 process(tool, &ev, NULL, NULL); 2213 2214 /* 2215 * The put function will copy all the tracing data 2216 * stored in temp file to the pipe. 2217 */ 2218 tracing_data_put(tdata); 2219 2220 ff = (struct feat_fd){ .fd = fd }; 2221 if (write_padded(&ff, NULL, 0, padding)) 2222 return -1; 2223 2224 return aligned_size; 2225} 2226#endif 2227 2228int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 2229 perf_event__handler_t process, struct machine *machine) 2230{ 2231 union perf_event ev; 2232 size_t len; 2233 2234 if (!pos->hit) 2235 return 0; 2236 2237 memset(&ev, 0, sizeof(ev)); 2238 2239 len = pos->long_name_len + 1; 2240 len = PERF_ALIGN(len, NAME_ALIGN); 2241 ev.build_id.size = min(pos->bid.size, sizeof(pos->bid.data)); 2242 memcpy(&ev.build_id.build_id, pos->bid.data, ev.build_id.size); 2243 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 2244 ev.build_id.header.misc = misc | PERF_RECORD_MISC_BUILD_ID_SIZE; 2245 ev.build_id.pid = machine->pid; 2246 ev.build_id.header.size = sizeof(ev.build_id) + len; 2247 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 2248 2249 return process(tool, &ev, NULL, machine); 2250} 2251 2252int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 2253 struct evlist *evlist, perf_event__handler_t process, bool attrs) 2254{ 2255 int err; 2256 2257 if (attrs) { 2258 err = perf_event__synthesize_attrs(tool, evlist, process); 2259 if (err < 0) { 2260 pr_err("Couldn't synthesize attrs.\n"); 2261 return err; 2262 } 2263 } 2264 2265 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 2266 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 2267 if (err < 0) { 2268 pr_err("Couldn't synthesize thread map.\n"); 2269 return err; 2270 } 2271 2272 err = perf_event__synthesize_cpu_map(tool, evlist->core.user_requested_cpus, process, NULL); 2273 if (err < 0) { 2274 pr_err("Couldn't synthesize thread map.\n"); 2275 return err; 2276 } 2277 2278 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 2279 if (err < 0) { 2280 pr_err("Couldn't synthesize config.\n"); 2281 return err; 2282 } 2283 2284 return 0; 2285} 2286 2287extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 2288 2289int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 2290 struct evlist *evlist, perf_event__handler_t process) 2291{ 2292 struct perf_header *header = &session->header; 2293 struct perf_record_header_feature *fe; 2294 struct feat_fd ff; 2295 size_t sz, sz_hdr; 2296 int feat, ret; 2297 2298 sz_hdr = sizeof(fe->header); 2299 sz = sizeof(union perf_event); 2300 /* get a nice alignment */ 2301 sz = PERF_ALIGN(sz, page_size); 2302 2303 memset(&ff, 0, sizeof(ff)); 2304 2305 ff.buf = malloc(sz); 2306 if (!ff.buf) 2307 return -ENOMEM; 2308 2309 ff.size = sz - sz_hdr; 2310 ff.ph = &session->header; 2311 2312 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 2313 if (!feat_ops[feat].synthesize) { 2314 pr_debug("No record header feature for header :%d\n", feat); 2315 continue; 2316 } 2317 2318 ff.offset = sizeof(*fe); 2319 2320 ret = feat_ops[feat].write(&ff, evlist); 2321 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2322 pr_debug("Error writing feature\n"); 2323 continue; 2324 } 2325 /* ff.buf may have changed due to realloc in do_write() */ 2326 fe = ff.buf; 2327 memset(fe, 0, sizeof(*fe)); 2328 2329 fe->feat_id = feat; 2330 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2331 fe->header.size = ff.offset; 2332 2333 ret = process(tool, ff.buf, NULL, NULL); 2334 if (ret) { 2335 free(ff.buf); 2336 return ret; 2337 } 2338 } 2339 2340 /* Send HEADER_LAST_FEATURE mark. */ 2341 fe = ff.buf; 2342 fe->feat_id = HEADER_LAST_FEATURE; 2343 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2344 fe->header.size = sizeof(*fe); 2345 2346 ret = process(tool, ff.buf, NULL, NULL); 2347 2348 free(ff.buf); 2349 return ret; 2350} 2351 2352int perf_event__synthesize_for_pipe(struct perf_tool *tool, 2353 struct perf_session *session, 2354 struct perf_data *data, 2355 perf_event__handler_t process) 2356{ 2357 int err; 2358 int ret = 0; 2359 struct evlist *evlist = session->evlist; 2360 2361 /* 2362 * We need to synthesize events first, because some 2363 * features works on top of them (on report side). 2364 */ 2365 err = perf_event__synthesize_attrs(tool, evlist, process); 2366 if (err < 0) { 2367 pr_err("Couldn't synthesize attrs.\n"); 2368 return err; 2369 } 2370 ret += err; 2371 2372 err = perf_event__synthesize_features(tool, session, evlist, process); 2373 if (err < 0) { 2374 pr_err("Couldn't synthesize features.\n"); 2375 return err; 2376 } 2377 ret += err; 2378 2379#ifdef HAVE_LIBTRACEEVENT 2380 if (have_tracepoints(&evlist->core.entries)) { 2381 int fd = perf_data__fd(data); 2382 2383 /* 2384 * FIXME err <= 0 here actually means that 2385 * there were no tracepoints so its not really 2386 * an error, just that we don't need to 2387 * synthesize anything. We really have to 2388 * return this more properly and also 2389 * propagate errors that now are calling die() 2390 */ 2391 err = perf_event__synthesize_tracing_data(tool, fd, evlist, 2392 process); 2393 if (err <= 0) { 2394 pr_err("Couldn't record tracing data.\n"); 2395 return err; 2396 } 2397 ret += err; 2398 } 2399#else 2400 (void)data; 2401#endif 2402 2403 return ret; 2404} 2405 2406int parse_synth_opt(char *synth) 2407{ 2408 char *p, *q; 2409 int ret = 0; 2410 2411 if (synth == NULL) 2412 return -1; 2413 2414 for (q = synth; (p = strsep(&q, ",")); p = q) { 2415 if (!strcasecmp(p, "no") || !strcasecmp(p, "none")) 2416 return 0; 2417 2418 if (!strcasecmp(p, "all")) 2419 return PERF_SYNTH_ALL; 2420 2421 if (!strcasecmp(p, "task")) 2422 ret |= PERF_SYNTH_TASK; 2423 else if (!strcasecmp(p, "mmap")) 2424 ret |= PERF_SYNTH_TASK | PERF_SYNTH_MMAP; 2425 else if (!strcasecmp(p, "cgroup")) 2426 ret |= PERF_SYNTH_CGROUP; 2427 else 2428 return -1; 2429 } 2430 2431 return ret; 2432} 2433