1// SPDX-License-Identifier: GPL-2.0-only 2 3#include "util/debug.h" 4#include "util/dso.h" 5#include "util/event.h" 6#include "util/evlist.h" 7#include "util/machine.h" 8#include "util/map.h" 9#include "util/map_symbol.h" 10#include "util/branch.h" 11#include "util/memswap.h" 12#include "util/namespaces.h" 13#include "util/session.h" 14#include "util/stat.h" 15#include "util/symbol.h" 16#include "util/synthetic-events.h" 17#include "util/target.h" 18#include "util/time-utils.h" 19#include "util/cgroup.h" 20#include <linux/bitops.h> 21#include <linux/kernel.h> 22#include <linux/string.h> 23#include <linux/zalloc.h> 24#include <linux/perf_event.h> 25#include <asm/bug.h> 26#include <perf/evsel.h> 27#include <internal/cpumap.h> 28#include <perf/cpumap.h> 29#include <internal/lib.h> // page_size 30#include <internal/threadmap.h> 31#include <perf/threadmap.h> 32#include <symbol/kallsyms.h> 33#include <dirent.h> 34#include <errno.h> 35#include <inttypes.h> 36#include <stdio.h> 37#include <string.h> 38#include <uapi/linux/mman.h> /* To get things like MAP_HUGETLB even on older libc headers */ 39#include <api/fs/fs.h> 40#include <api/io.h> 41#include <sys/types.h> 42#include <sys/stat.h> 43#include <fcntl.h> 44#include <unistd.h> 45 46#define DEFAULT_PROC_MAP_PARSE_TIMEOUT 500 47 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, char *comm, size_t len, 73 pid_t *tgid, pid_t *ppid) 74{ 75 char bf[4096]; 76 int fd; 77 size_t size = 0; 78 ssize_t n; 79 char *name, *tgids, *ppids; 80 81 *tgid = -1; 82 *ppid = -1; 83 84 snprintf(bf, sizeof(bf), "/proc/%d/status", pid); 85 86 fd = open(bf, O_RDONLY); 87 if (fd < 0) { 88 pr_debug("couldn't open %s\n", bf); 89 return -1; 90 } 91 92 n = read(fd, bf, sizeof(bf) - 1); 93 close(fd); 94 if (n <= 0) { 95 pr_warning("Couldn't get COMM, tigd and ppid for pid %d\n", 96 pid); 97 return -1; 98 } 99 bf[n] = '\0'; 100 101 name = strstr(bf, "Name:"); 102 tgids = strstr(bf, "Tgid:"); 103 ppids = strstr(bf, "PPid:"); 104 105 if (name) { 106 char *nl; 107 108 name = skip_spaces(name + 5); /* strlen("Name:") */ 109 nl = strchr(name, '\n'); 110 if (nl) 111 *nl = '\0'; 112 113 size = strlen(name); 114 if (size >= len) 115 size = len - 1; 116 memcpy(comm, name, size); 117 comm[size] = '\0'; 118 } else { 119 pr_debug("Name: string not found for pid %d\n", pid); 120 } 121 122 if (tgids) { 123 tgids += 5; /* strlen("Tgid:") */ 124 *tgid = atoi(tgids); 125 } else { 126 pr_debug("Tgid: string not found for pid %d\n", pid); 127 } 128 129 if (ppids) { 130 ppids += 5; /* strlen("PPid:") */ 131 *ppid = atoi(ppids); 132 } else { 133 pr_debug("PPid: string not found for pid %d\n", pid); 134 } 135 136 return 0; 137} 138 139static int perf_event__prepare_comm(union perf_event *event, pid_t pid, 140 struct machine *machine, 141 pid_t *tgid, pid_t *ppid) 142{ 143 size_t size; 144 145 *ppid = -1; 146 147 memset(&event->comm, 0, sizeof(event->comm)); 148 149 if (machine__is_host(machine)) { 150 if (perf_event__get_comm_ids(pid, event->comm.comm, 151 sizeof(event->comm.comm), 152 tgid, ppid) != 0) { 153 return -1; 154 } 155 } else { 156 *tgid = machine->pid; 157 } 158 159 if (*tgid < 0) 160 return -1; 161 162 event->comm.pid = *tgid; 163 event->comm.header.type = PERF_RECORD_COMM; 164 165 size = strlen(event->comm.comm) + 1; 166 size = PERF_ALIGN(size, sizeof(u64)); 167 memset(event->comm.comm + size, 0, machine->id_hdr_size); 168 event->comm.header.size = (sizeof(event->comm) - 169 (sizeof(event->comm.comm) - size) + 170 machine->id_hdr_size); 171 event->comm.tid = pid; 172 173 return 0; 174} 175 176pid_t perf_event__synthesize_comm(struct perf_tool *tool, 177 union perf_event *event, pid_t pid, 178 perf_event__handler_t process, 179 struct machine *machine) 180{ 181 pid_t tgid, ppid; 182 183 if (perf_event__prepare_comm(event, pid, machine, &tgid, &ppid) != 0) 184 return -1; 185 186 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 187 return -1; 188 189 return tgid; 190} 191 192static void perf_event__get_ns_link_info(pid_t pid, const char *ns, 193 struct perf_ns_link_info *ns_link_info) 194{ 195 struct stat64 st; 196 char proc_ns[128]; 197 198 sprintf(proc_ns, "/proc/%u/ns/%s", pid, ns); 199 if (stat64(proc_ns, &st) == 0) { 200 ns_link_info->dev = st.st_dev; 201 ns_link_info->ino = st.st_ino; 202 } 203} 204 205int perf_event__synthesize_namespaces(struct perf_tool *tool, 206 union perf_event *event, 207 pid_t pid, pid_t tgid, 208 perf_event__handler_t process, 209 struct machine *machine) 210{ 211 u32 idx; 212 struct perf_ns_link_info *ns_link_info; 213 214 if (!tool || !tool->namespace_events) 215 return 0; 216 217 memset(&event->namespaces, 0, (sizeof(event->namespaces) + 218 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 219 machine->id_hdr_size)); 220 221 event->namespaces.pid = tgid; 222 event->namespaces.tid = pid; 223 224 event->namespaces.nr_namespaces = NR_NAMESPACES; 225 226 ns_link_info = event->namespaces.link_info; 227 228 for (idx = 0; idx < event->namespaces.nr_namespaces; idx++) 229 perf_event__get_ns_link_info(pid, perf_ns__name(idx), 230 &ns_link_info[idx]); 231 232 event->namespaces.header.type = PERF_RECORD_NAMESPACES; 233 234 event->namespaces.header.size = (sizeof(event->namespaces) + 235 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 236 machine->id_hdr_size); 237 238 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 239 return -1; 240 241 return 0; 242} 243 244static int perf_event__synthesize_fork(struct perf_tool *tool, 245 union perf_event *event, 246 pid_t pid, pid_t tgid, pid_t ppid, 247 perf_event__handler_t process, 248 struct machine *machine) 249{ 250 memset(&event->fork, 0, sizeof(event->fork) + machine->id_hdr_size); 251 252 /* 253 * for main thread set parent to ppid from status file. For other 254 * threads set parent pid to main thread. ie., assume main thread 255 * spawns all threads in a process 256 */ 257 if (tgid == pid) { 258 event->fork.ppid = ppid; 259 event->fork.ptid = ppid; 260 } else { 261 event->fork.ppid = tgid; 262 event->fork.ptid = tgid; 263 } 264 event->fork.pid = tgid; 265 event->fork.tid = pid; 266 event->fork.header.type = PERF_RECORD_FORK; 267 event->fork.header.misc = PERF_RECORD_MISC_FORK_EXEC; 268 269 event->fork.header.size = (sizeof(event->fork) + machine->id_hdr_size); 270 271 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) 272 return -1; 273 274 return 0; 275} 276 277static bool read_proc_maps_line(struct io *io, __u64 *start, __u64 *end, 278 u32 *prot, u32 *flags, __u64 *offset, 279 u32 *maj, u32 *min, 280 __u64 *inode, 281 ssize_t pathname_size, char *pathname) 282{ 283 __u64 temp; 284 int ch; 285 char *start_pathname = pathname; 286 287 if (io__get_hex(io, start) != '-') 288 return false; 289 if (io__get_hex(io, end) != ' ') 290 return false; 291 292 /* map protection and flags bits */ 293 *prot = 0; 294 ch = io__get_char(io); 295 if (ch == 'r') 296 *prot |= PROT_READ; 297 else if (ch != '-') 298 return false; 299 ch = io__get_char(io); 300 if (ch == 'w') 301 *prot |= PROT_WRITE; 302 else if (ch != '-') 303 return false; 304 ch = io__get_char(io); 305 if (ch == 'x') 306 *prot |= PROT_EXEC; 307 else if (ch != '-') 308 return false; 309 ch = io__get_char(io); 310 if (ch == 's') 311 *flags = MAP_SHARED; 312 else if (ch == 'p') 313 *flags = MAP_PRIVATE; 314 else 315 return false; 316 if (io__get_char(io) != ' ') 317 return false; 318 319 if (io__get_hex(io, offset) != ' ') 320 return false; 321 322 if (io__get_hex(io, &temp) != ':') 323 return false; 324 *maj = temp; 325 if (io__get_hex(io, &temp) != ' ') 326 return false; 327 *min = temp; 328 329 ch = io__get_dec(io, inode); 330 if (ch != ' ') { 331 *pathname = '\0'; 332 return ch == '\n'; 333 } 334 do { 335 ch = io__get_char(io); 336 } while (ch == ' '); 337 while (true) { 338 if (ch < 0) 339 return false; 340 if (ch == '\0' || ch == '\n' || 341 (pathname + 1 - start_pathname) >= pathname_size) { 342 *pathname = '\0'; 343 return true; 344 } 345 *pathname++ = ch; 346 ch = io__get_char(io); 347 } 348} 349 350int perf_event__synthesize_mmap_events(struct perf_tool *tool, 351 union perf_event *event, 352 pid_t pid, pid_t tgid, 353 perf_event__handler_t process, 354 struct machine *machine, 355 bool mmap_data) 356{ 357 unsigned long long t; 358 char bf[BUFSIZ]; 359 struct io io; 360 bool truncation = false; 361 unsigned long long timeout = proc_map_timeout * 1000000ULL; 362 int rc = 0; 363 const char *hugetlbfs_mnt = hugetlbfs__mountpoint(); 364 int hugetlbfs_mnt_len = hugetlbfs_mnt ? strlen(hugetlbfs_mnt) : 0; 365 366 if (machine__is_default_guest(machine)) 367 return 0; 368 369 snprintf(bf, sizeof(bf), "%s/proc/%d/task/%d/maps", 370 machine->root_dir, pid, pid); 371 372 io.fd = open(bf, O_RDONLY, 0); 373 if (io.fd < 0) { 374 /* 375 * We raced with a task exiting - just return: 376 */ 377 pr_debug("couldn't open %s\n", bf); 378 return -1; 379 } 380 io__init(&io, io.fd, bf, sizeof(bf)); 381 382 event->header.type = PERF_RECORD_MMAP2; 383 t = rdclock(); 384 385 while (!io.eof) { 386 static const char anonstr[] = "//anon"; 387 size_t size, aligned_size; 388 389 /* ensure null termination since stack will be reused. */ 390 event->mmap2.filename[0] = '\0'; 391 392 /* 00400000-0040c000 r-xp 00000000 fd:01 41038 /bin/cat */ 393 if (!read_proc_maps_line(&io, 394 &event->mmap2.start, 395 &event->mmap2.len, 396 &event->mmap2.prot, 397 &event->mmap2.flags, 398 &event->mmap2.pgoff, 399 &event->mmap2.maj, 400 &event->mmap2.min, 401 &event->mmap2.ino, 402 sizeof(event->mmap2.filename), 403 event->mmap2.filename)) 404 continue; 405 406 if ((rdclock() - t) > timeout) { 407 pr_warning("Reading %s/proc/%d/task/%d/maps time out. " 408 "You may want to increase " 409 "the time limit by --proc-map-timeout\n", 410 machine->root_dir, pid, pid); 411 truncation = true; 412 goto out; 413 } 414 415 event->mmap2.ino_generation = 0; 416 417 /* 418 * Just like the kernel, see __perf_event_mmap in kernel/perf_event.c 419 */ 420 if (machine__is_host(machine)) 421 event->header.misc = PERF_RECORD_MISC_USER; 422 else 423 event->header.misc = PERF_RECORD_MISC_GUEST_USER; 424 425 if ((event->mmap2.prot & PROT_EXEC) == 0) { 426 if (!mmap_data || (event->mmap2.prot & PROT_READ) == 0) 427 continue; 428 429 event->header.misc |= PERF_RECORD_MISC_MMAP_DATA; 430 } 431 432out: 433 if (truncation) 434 event->header.misc |= PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT; 435 436 if (!strcmp(event->mmap2.filename, "")) 437 strcpy(event->mmap2.filename, anonstr); 438 439 if (hugetlbfs_mnt_len && 440 !strncmp(event->mmap2.filename, hugetlbfs_mnt, 441 hugetlbfs_mnt_len)) { 442 strcpy(event->mmap2.filename, anonstr); 443 event->mmap2.flags |= MAP_HUGETLB; 444 } 445 446 size = strlen(event->mmap2.filename) + 1; 447 aligned_size = PERF_ALIGN(size, sizeof(u64)); 448 event->mmap2.len -= event->mmap.start; 449 event->mmap2.header.size = (sizeof(event->mmap2) - 450 (sizeof(event->mmap2.filename) - aligned_size)); 451 memset(event->mmap2.filename + size, 0, machine->id_hdr_size + 452 (aligned_size - size)); 453 event->mmap2.header.size += machine->id_hdr_size; 454 event->mmap2.pid = tgid; 455 event->mmap2.tid = pid; 456 457 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 458 rc = -1; 459 break; 460 } 461 462 if (truncation) 463 break; 464 } 465 466 close(io.fd); 467 return rc; 468} 469 470#ifdef HAVE_FILE_HANDLE 471static int perf_event__synthesize_cgroup(struct perf_tool *tool, 472 union perf_event *event, 473 char *path, size_t mount_len, 474 perf_event__handler_t process, 475 struct machine *machine) 476{ 477 size_t event_size = sizeof(event->cgroup) - sizeof(event->cgroup.path); 478 size_t path_len = strlen(path) - mount_len + 1; 479 struct { 480 struct file_handle fh; 481 uint64_t cgroup_id; 482 } handle; 483 int mount_id; 484 485 while (path_len % sizeof(u64)) 486 path[mount_len + path_len++] = '\0'; 487 488 memset(&event->cgroup, 0, event_size); 489 490 event->cgroup.header.type = PERF_RECORD_CGROUP; 491 event->cgroup.header.size = event_size + path_len + machine->id_hdr_size; 492 493 handle.fh.handle_bytes = sizeof(handle.cgroup_id); 494 if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0) { 495 pr_debug("stat failed: %s\n", path); 496 return -1; 497 } 498 499 event->cgroup.id = handle.cgroup_id; 500 strncpy(event->cgroup.path, path + mount_len, path_len); 501 memset(event->cgroup.path + path_len, 0, machine->id_hdr_size); 502 503 if (perf_tool__process_synth_event(tool, event, machine, process) < 0) { 504 pr_debug("process synth event failed\n"); 505 return -1; 506 } 507 508 return 0; 509} 510 511static int perf_event__walk_cgroup_tree(struct perf_tool *tool, 512 union perf_event *event, 513 char *path, size_t mount_len, 514 perf_event__handler_t process, 515 struct machine *machine) 516{ 517 size_t pos = strlen(path); 518 DIR *d; 519 struct dirent *dent; 520 int ret = 0; 521 522 if (perf_event__synthesize_cgroup(tool, event, path, mount_len, 523 process, machine) < 0) 524 return -1; 525 526 d = opendir(path); 527 if (d == NULL) { 528 pr_debug("failed to open directory: %s\n", path); 529 return -1; 530 } 531 532 while ((dent = readdir(d)) != NULL) { 533 if (dent->d_type != DT_DIR) 534 continue; 535 if (!strcmp(dent->d_name, ".") || 536 !strcmp(dent->d_name, "..")) 537 continue; 538 539 /* any sane path should be less than PATH_MAX */ 540 if (strlen(path) + strlen(dent->d_name) + 1 >= PATH_MAX) 541 continue; 542 543 if (path[pos - 1] != '/') 544 strcat(path, "/"); 545 strcat(path, dent->d_name); 546 547 ret = perf_event__walk_cgroup_tree(tool, event, path, 548 mount_len, process, machine); 549 if (ret < 0) 550 break; 551 552 path[pos] = '\0'; 553 } 554 555 closedir(d); 556 return ret; 557} 558 559int perf_event__synthesize_cgroups(struct perf_tool *tool, 560 perf_event__handler_t process, 561 struct machine *machine) 562{ 563 union perf_event event; 564 char cgrp_root[PATH_MAX]; 565 size_t mount_len; /* length of mount point in the path */ 566 567 if (!tool || !tool->cgroup_events) 568 return 0; 569 570 if (cgroupfs_find_mountpoint(cgrp_root, PATH_MAX, "perf_event") < 0) { 571 pr_debug("cannot find cgroup mount point\n"); 572 return -1; 573 } 574 575 mount_len = strlen(cgrp_root); 576 /* make sure the path starts with a slash (after mount point) */ 577 strcat(cgrp_root, "/"); 578 579 if (perf_event__walk_cgroup_tree(tool, &event, cgrp_root, mount_len, 580 process, machine) < 0) 581 return -1; 582 583 return 0; 584} 585#else 586int perf_event__synthesize_cgroups(struct perf_tool *tool __maybe_unused, 587 perf_event__handler_t process __maybe_unused, 588 struct machine *machine __maybe_unused) 589{ 590 return -1; 591} 592#endif 593 594int perf_event__synthesize_modules(struct perf_tool *tool, perf_event__handler_t process, 595 struct machine *machine) 596{ 597 int rc = 0; 598 struct map *pos; 599 struct maps *maps = machine__kernel_maps(machine); 600 union perf_event *event = zalloc((sizeof(event->mmap) + 601 machine->id_hdr_size)); 602 if (event == NULL) { 603 pr_debug("Not enough memory synthesizing mmap event " 604 "for kernel modules\n"); 605 return -1; 606 } 607 608 event->header.type = PERF_RECORD_MMAP; 609 610 /* 611 * kernel uses 0 for user space maps, see kernel/perf_event.c 612 * __perf_event_mmap 613 */ 614 if (machine__is_host(machine)) 615 event->header.misc = PERF_RECORD_MISC_KERNEL; 616 else 617 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 618 619 maps__for_each_entry(maps, pos) { 620 size_t size; 621 622 if (!__map__is_kmodule(pos)) 623 continue; 624 625 size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64)); 626 event->mmap.header.type = PERF_RECORD_MMAP; 627 event->mmap.header.size = (sizeof(event->mmap) - 628 (sizeof(event->mmap.filename) - size)); 629 memset(event->mmap.filename + size, 0, machine->id_hdr_size); 630 event->mmap.header.size += machine->id_hdr_size; 631 event->mmap.start = pos->start; 632 event->mmap.len = pos->end - pos->start; 633 event->mmap.pid = machine->pid; 634 635 memcpy(event->mmap.filename, pos->dso->long_name, 636 pos->dso->long_name_len + 1); 637 if (perf_tool__process_synth_event(tool, event, machine, process) != 0) { 638 rc = -1; 639 break; 640 } 641 } 642 643 free(event); 644 return rc; 645} 646 647static int __event__synthesize_thread(union perf_event *comm_event, 648 union perf_event *mmap_event, 649 union perf_event *fork_event, 650 union perf_event *namespaces_event, 651 pid_t pid, int full, perf_event__handler_t process, 652 struct perf_tool *tool, struct machine *machine, bool mmap_data) 653{ 654 char filename[PATH_MAX]; 655 DIR *tasks; 656 struct dirent *dirent; 657 pid_t tgid, ppid; 658 int rc = 0; 659 660 /* special case: only send one comm event using passed in pid */ 661 if (!full) { 662 tgid = perf_event__synthesize_comm(tool, comm_event, pid, 663 process, machine); 664 665 if (tgid == -1) 666 return -1; 667 668 if (perf_event__synthesize_namespaces(tool, namespaces_event, pid, 669 tgid, process, machine) < 0) 670 return -1; 671 672 /* 673 * send mmap only for thread group leader 674 * see thread__init_maps() 675 */ 676 if (pid == tgid && 677 perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 678 process, machine, mmap_data)) 679 return -1; 680 681 return 0; 682 } 683 684 if (machine__is_default_guest(machine)) 685 return 0; 686 687 snprintf(filename, sizeof(filename), "%s/proc/%d/task", 688 machine->root_dir, pid); 689 690 tasks = opendir(filename); 691 if (tasks == NULL) { 692 pr_debug("couldn't open %s\n", filename); 693 return 0; 694 } 695 696 while ((dirent = readdir(tasks)) != NULL) { 697 char *end; 698 pid_t _pid; 699 700 _pid = strtol(dirent->d_name, &end, 10); 701 if (*end) 702 continue; 703 704 rc = -1; 705 if (perf_event__prepare_comm(comm_event, _pid, machine, 706 &tgid, &ppid) != 0) 707 break; 708 709 if (perf_event__synthesize_fork(tool, fork_event, _pid, tgid, 710 ppid, process, machine) < 0) 711 break; 712 713 if (perf_event__synthesize_namespaces(tool, namespaces_event, _pid, 714 tgid, process, machine) < 0) 715 break; 716 717 /* 718 * Send the prepared comm event 719 */ 720 if (perf_tool__process_synth_event(tool, comm_event, machine, process) != 0) 721 break; 722 723 rc = 0; 724 if (_pid == pid) { 725 /* process the parent's maps too */ 726 rc = perf_event__synthesize_mmap_events(tool, mmap_event, pid, tgid, 727 process, machine, mmap_data); 728 if (rc) 729 break; 730 } 731 } 732 733 closedir(tasks); 734 return rc; 735} 736 737int perf_event__synthesize_thread_map(struct perf_tool *tool, 738 struct perf_thread_map *threads, 739 perf_event__handler_t process, 740 struct machine *machine, 741 bool mmap_data) 742{ 743 union perf_event *comm_event, *mmap_event, *fork_event; 744 union perf_event *namespaces_event; 745 int err = -1, thread, j; 746 747 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 748 if (comm_event == NULL) 749 goto out; 750 751 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 752 if (mmap_event == NULL) 753 goto out_free_comm; 754 755 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 756 if (fork_event == NULL) 757 goto out_free_mmap; 758 759 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 760 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 761 machine->id_hdr_size); 762 if (namespaces_event == NULL) 763 goto out_free_fork; 764 765 err = 0; 766 for (thread = 0; thread < threads->nr; ++thread) { 767 if (__event__synthesize_thread(comm_event, mmap_event, 768 fork_event, namespaces_event, 769 perf_thread_map__pid(threads, thread), 0, 770 process, tool, machine, 771 mmap_data)) { 772 err = -1; 773 break; 774 } 775 776 /* 777 * comm.pid is set to thread group id by 778 * perf_event__synthesize_comm 779 */ 780 if ((int) comm_event->comm.pid != perf_thread_map__pid(threads, thread)) { 781 bool need_leader = true; 782 783 /* is thread group leader in thread_map? */ 784 for (j = 0; j < threads->nr; ++j) { 785 if ((int) comm_event->comm.pid == perf_thread_map__pid(threads, j)) { 786 need_leader = false; 787 break; 788 } 789 } 790 791 /* if not, generate events for it */ 792 if (need_leader && 793 __event__synthesize_thread(comm_event, mmap_event, 794 fork_event, namespaces_event, 795 comm_event->comm.pid, 0, 796 process, tool, machine, 797 mmap_data)) { 798 err = -1; 799 break; 800 } 801 } 802 } 803 free(namespaces_event); 804out_free_fork: 805 free(fork_event); 806out_free_mmap: 807 free(mmap_event); 808out_free_comm: 809 free(comm_event); 810out: 811 return err; 812} 813 814static int __perf_event__synthesize_threads(struct perf_tool *tool, 815 perf_event__handler_t process, 816 struct machine *machine, 817 bool mmap_data, 818 struct dirent **dirent, 819 int start, 820 int num) 821{ 822 union perf_event *comm_event, *mmap_event, *fork_event; 823 union perf_event *namespaces_event; 824 int err = -1; 825 char *end; 826 pid_t pid; 827 int i; 828 829 comm_event = malloc(sizeof(comm_event->comm) + machine->id_hdr_size); 830 if (comm_event == NULL) 831 goto out; 832 833 mmap_event = malloc(sizeof(mmap_event->mmap2) + machine->id_hdr_size); 834 if (mmap_event == NULL) 835 goto out_free_comm; 836 837 fork_event = malloc(sizeof(fork_event->fork) + machine->id_hdr_size); 838 if (fork_event == NULL) 839 goto out_free_mmap; 840 841 namespaces_event = malloc(sizeof(namespaces_event->namespaces) + 842 (NR_NAMESPACES * sizeof(struct perf_ns_link_info)) + 843 machine->id_hdr_size); 844 if (namespaces_event == NULL) 845 goto out_free_fork; 846 847 for (i = start; i < start + num; i++) { 848 if (!isdigit(dirent[i]->d_name[0])) 849 continue; 850 851 pid = (pid_t)strtol(dirent[i]->d_name, &end, 10); 852 /* only interested in proper numerical dirents */ 853 if (*end) 854 continue; 855 /* 856 * We may race with exiting thread, so don't stop just because 857 * one thread couldn't be synthesized. 858 */ 859 __event__synthesize_thread(comm_event, mmap_event, fork_event, 860 namespaces_event, pid, 1, process, 861 tool, machine, mmap_data); 862 } 863 err = 0; 864 865 free(namespaces_event); 866out_free_fork: 867 free(fork_event); 868out_free_mmap: 869 free(mmap_event); 870out_free_comm: 871 free(comm_event); 872out: 873 return err; 874} 875 876struct synthesize_threads_arg { 877 struct perf_tool *tool; 878 perf_event__handler_t process; 879 struct machine *machine; 880 bool mmap_data; 881 struct dirent **dirent; 882 int num; 883 int start; 884}; 885 886static void *synthesize_threads_worker(void *arg) 887{ 888 struct synthesize_threads_arg *args = arg; 889 890 __perf_event__synthesize_threads(args->tool, args->process, 891 args->machine, args->mmap_data, 892 args->dirent, 893 args->start, args->num); 894 return NULL; 895} 896 897int perf_event__synthesize_threads(struct perf_tool *tool, 898 perf_event__handler_t process, 899 struct machine *machine, 900 bool mmap_data, 901 unsigned int nr_threads_synthesize) 902{ 903 struct synthesize_threads_arg *args = NULL; 904 pthread_t *synthesize_threads = NULL; 905 char proc_path[PATH_MAX]; 906 struct dirent **dirent; 907 int num_per_thread; 908 int m, n, i, j; 909 int thread_nr; 910 int base = 0; 911 int err = -1; 912 913 914 if (machine__is_default_guest(machine)) 915 return 0; 916 917 snprintf(proc_path, sizeof(proc_path), "%s/proc", machine->root_dir); 918 n = scandir(proc_path, &dirent, 0, alphasort); 919 if (n < 0) 920 return err; 921 922 if (nr_threads_synthesize == UINT_MAX) 923 thread_nr = sysconf(_SC_NPROCESSORS_ONLN); 924 else 925 thread_nr = nr_threads_synthesize; 926 927 if (thread_nr <= 1) { 928 err = __perf_event__synthesize_threads(tool, process, 929 machine, mmap_data, 930 dirent, base, n); 931 goto free_dirent; 932 } 933 if (thread_nr > n) 934 thread_nr = n; 935 936 synthesize_threads = calloc(sizeof(pthread_t), thread_nr); 937 if (synthesize_threads == NULL) 938 goto free_dirent; 939 940 args = calloc(sizeof(*args), thread_nr); 941 if (args == NULL) 942 goto free_threads; 943 944 num_per_thread = n / thread_nr; 945 m = n % thread_nr; 946 for (i = 0; i < thread_nr; i++) { 947 args[i].tool = tool; 948 args[i].process = process; 949 args[i].machine = machine; 950 args[i].mmap_data = mmap_data; 951 args[i].dirent = dirent; 952 } 953 for (i = 0; i < m; i++) { 954 args[i].num = num_per_thread + 1; 955 args[i].start = i * args[i].num; 956 } 957 if (i != 0) 958 base = args[i-1].start + args[i-1].num; 959 for (j = i; j < thread_nr; j++) { 960 args[j].num = num_per_thread; 961 args[j].start = base + (j - i) * args[i].num; 962 } 963 964 for (i = 0; i < thread_nr; i++) { 965 if (pthread_create(&synthesize_threads[i], NULL, 966 synthesize_threads_worker, &args[i])) 967 goto out_join; 968 } 969 err = 0; 970out_join: 971 for (i = 0; i < thread_nr; i++) 972 pthread_join(synthesize_threads[i], NULL); 973 free(args); 974free_threads: 975 free(synthesize_threads); 976free_dirent: 977 for (i = 0; i < n; i++) 978 zfree(&dirent[i]); 979 free(dirent); 980 981 return err; 982} 983 984int __weak perf_event__synthesize_extra_kmaps(struct perf_tool *tool __maybe_unused, 985 perf_event__handler_t process __maybe_unused, 986 struct machine *machine __maybe_unused) 987{ 988 return 0; 989} 990 991static int __perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 992 perf_event__handler_t process, 993 struct machine *machine) 994{ 995 size_t size; 996 struct map *map = machine__kernel_map(machine); 997 struct kmap *kmap; 998 int err; 999 union perf_event *event; 1000 1001 if (map == NULL) 1002 return -1; 1003 1004 kmap = map__kmap(map); 1005 if (!kmap->ref_reloc_sym) 1006 return -1; 1007 1008 /* 1009 * We should get this from /sys/kernel/sections/.text, but till that is 1010 * available use this, and after it is use this as a fallback for older 1011 * kernels. 1012 */ 1013 event = zalloc((sizeof(event->mmap) + machine->id_hdr_size)); 1014 if (event == NULL) { 1015 pr_debug("Not enough memory synthesizing mmap event " 1016 "for kernel modules\n"); 1017 return -1; 1018 } 1019 1020 if (machine__is_host(machine)) { 1021 /* 1022 * kernel uses PERF_RECORD_MISC_USER for user space maps, 1023 * see kernel/perf_event.c __perf_event_mmap 1024 */ 1025 event->header.misc = PERF_RECORD_MISC_KERNEL; 1026 } else { 1027 event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL; 1028 } 1029 1030 size = snprintf(event->mmap.filename, sizeof(event->mmap.filename), 1031 "%s%s", machine->mmap_name, kmap->ref_reloc_sym->name) + 1; 1032 size = PERF_ALIGN(size, sizeof(u64)); 1033 event->mmap.header.type = PERF_RECORD_MMAP; 1034 event->mmap.header.size = (sizeof(event->mmap) - 1035 (sizeof(event->mmap.filename) - size) + machine->id_hdr_size); 1036 event->mmap.pgoff = kmap->ref_reloc_sym->addr; 1037 event->mmap.start = map->start; 1038 event->mmap.len = map->end - event->mmap.start; 1039 event->mmap.pid = machine->pid; 1040 1041 err = perf_tool__process_synth_event(tool, event, machine, process); 1042 free(event); 1043 1044 return err; 1045} 1046 1047int perf_event__synthesize_kernel_mmap(struct perf_tool *tool, 1048 perf_event__handler_t process, 1049 struct machine *machine) 1050{ 1051 int err; 1052 1053 err = __perf_event__synthesize_kernel_mmap(tool, process, machine); 1054 if (err < 0) 1055 return err; 1056 1057 return perf_event__synthesize_extra_kmaps(tool, process, machine); 1058} 1059 1060int perf_event__synthesize_thread_map2(struct perf_tool *tool, 1061 struct perf_thread_map *threads, 1062 perf_event__handler_t process, 1063 struct machine *machine) 1064{ 1065 union perf_event *event; 1066 int i, err, size; 1067 1068 size = sizeof(event->thread_map); 1069 size += threads->nr * sizeof(event->thread_map.entries[0]); 1070 1071 event = zalloc(size); 1072 if (!event) 1073 return -ENOMEM; 1074 1075 event->header.type = PERF_RECORD_THREAD_MAP; 1076 event->header.size = size; 1077 event->thread_map.nr = threads->nr; 1078 1079 for (i = 0; i < threads->nr; i++) { 1080 struct perf_record_thread_map_entry *entry = &event->thread_map.entries[i]; 1081 char *comm = perf_thread_map__comm(threads, i); 1082 1083 if (!comm) 1084 comm = (char *) ""; 1085 1086 entry->pid = perf_thread_map__pid(threads, i); 1087 strncpy((char *) &entry->comm, comm, sizeof(entry->comm)); 1088 } 1089 1090 err = process(tool, event, NULL, machine); 1091 1092 free(event); 1093 return err; 1094} 1095 1096static void synthesize_cpus(struct cpu_map_entries *cpus, 1097 struct perf_cpu_map *map) 1098{ 1099 int i; 1100 1101 cpus->nr = map->nr; 1102 1103 for (i = 0; i < map->nr; i++) 1104 cpus->cpu[i] = map->map[i]; 1105} 1106 1107static void synthesize_mask(struct perf_record_record_cpu_map *mask, 1108 struct perf_cpu_map *map, int max) 1109{ 1110 int i; 1111 1112 mask->nr = BITS_TO_LONGS(max); 1113 mask->long_size = sizeof(long); 1114 1115 for (i = 0; i < map->nr; i++) 1116 set_bit(map->map[i], mask->mask); 1117} 1118 1119static size_t cpus_size(struct perf_cpu_map *map) 1120{ 1121 return sizeof(struct cpu_map_entries) + map->nr * sizeof(u16); 1122} 1123 1124static size_t mask_size(struct perf_cpu_map *map, int *max) 1125{ 1126 int i; 1127 1128 *max = 0; 1129 1130 for (i = 0; i < map->nr; i++) { 1131 /* bit possition of the cpu is + 1 */ 1132 int bit = map->map[i] + 1; 1133 1134 if (bit > *max) 1135 *max = bit; 1136 } 1137 1138 return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long); 1139} 1140 1141void *cpu_map_data__alloc(struct perf_cpu_map *map, size_t *size, u16 *type, int *max) 1142{ 1143 size_t size_cpus, size_mask; 1144 bool is_dummy = perf_cpu_map__empty(map); 1145 1146 /* 1147 * Both array and mask data have variable size based 1148 * on the number of cpus and their actual values. 1149 * The size of the 'struct perf_record_cpu_map_data' is: 1150 * 1151 * array = size of 'struct cpu_map_entries' + 1152 * number of cpus * sizeof(u64) 1153 * 1154 * mask = size of 'struct perf_record_record_cpu_map' + 1155 * maximum cpu bit converted to size of longs 1156 * 1157 * and finaly + the size of 'struct perf_record_cpu_map_data'. 1158 */ 1159 size_cpus = cpus_size(map); 1160 size_mask = mask_size(map, max); 1161 1162 if (is_dummy || (size_cpus < size_mask)) { 1163 *size += size_cpus; 1164 *type = PERF_CPU_MAP__CPUS; 1165 } else { 1166 *size += size_mask; 1167 *type = PERF_CPU_MAP__MASK; 1168 } 1169 1170 *size += sizeof(struct perf_record_cpu_map_data); 1171 *size = PERF_ALIGN(*size, sizeof(u64)); 1172 return zalloc(*size); 1173} 1174 1175void cpu_map_data__synthesize(struct perf_record_cpu_map_data *data, struct perf_cpu_map *map, 1176 u16 type, int max) 1177{ 1178 data->type = type; 1179 1180 switch (type) { 1181 case PERF_CPU_MAP__CPUS: 1182 synthesize_cpus((struct cpu_map_entries *) data->data, map); 1183 break; 1184 case PERF_CPU_MAP__MASK: 1185 synthesize_mask((struct perf_record_record_cpu_map *)data->data, map, max); 1186 default: 1187 break; 1188 } 1189} 1190 1191static struct perf_record_cpu_map *cpu_map_event__new(struct perf_cpu_map *map) 1192{ 1193 size_t size = sizeof(struct perf_record_cpu_map); 1194 struct perf_record_cpu_map *event; 1195 int max; 1196 u16 type; 1197 1198 event = cpu_map_data__alloc(map, &size, &type, &max); 1199 if (!event) 1200 return NULL; 1201 1202 event->header.type = PERF_RECORD_CPU_MAP; 1203 event->header.size = size; 1204 event->data.type = type; 1205 1206 cpu_map_data__synthesize(&event->data, map, type, max); 1207 return event; 1208} 1209 1210int perf_event__synthesize_cpu_map(struct perf_tool *tool, 1211 struct perf_cpu_map *map, 1212 perf_event__handler_t process, 1213 struct machine *machine) 1214{ 1215 struct perf_record_cpu_map *event; 1216 int err; 1217 1218 event = cpu_map_event__new(map); 1219 if (!event) 1220 return -ENOMEM; 1221 1222 err = process(tool, (union perf_event *) event, NULL, machine); 1223 1224 free(event); 1225 return err; 1226} 1227 1228int perf_event__synthesize_stat_config(struct perf_tool *tool, 1229 struct perf_stat_config *config, 1230 perf_event__handler_t process, 1231 struct machine *machine) 1232{ 1233 struct perf_record_stat_config *event; 1234 int size, i = 0, err; 1235 1236 size = sizeof(*event); 1237 size += (PERF_STAT_CONFIG_TERM__MAX * sizeof(event->data[0])); 1238 1239 event = zalloc(size); 1240 if (!event) 1241 return -ENOMEM; 1242 1243 event->header.type = PERF_RECORD_STAT_CONFIG; 1244 event->header.size = size; 1245 event->nr = PERF_STAT_CONFIG_TERM__MAX; 1246 1247#define ADD(__term, __val) \ 1248 event->data[i].tag = PERF_STAT_CONFIG_TERM__##__term; \ 1249 event->data[i].val = __val; \ 1250 i++; 1251 1252 ADD(AGGR_MODE, config->aggr_mode) 1253 ADD(INTERVAL, config->interval) 1254 ADD(SCALE, config->scale) 1255 1256 WARN_ONCE(i != PERF_STAT_CONFIG_TERM__MAX, 1257 "stat config terms unbalanced\n"); 1258#undef ADD 1259 1260 err = process(tool, (union perf_event *) event, NULL, machine); 1261 1262 free(event); 1263 return err; 1264} 1265 1266int perf_event__synthesize_stat(struct perf_tool *tool, 1267 u32 cpu, u32 thread, u64 id, 1268 struct perf_counts_values *count, 1269 perf_event__handler_t process, 1270 struct machine *machine) 1271{ 1272 struct perf_record_stat event; 1273 1274 event.header.type = PERF_RECORD_STAT; 1275 event.header.size = sizeof(event); 1276 event.header.misc = 0; 1277 1278 event.id = id; 1279 event.cpu = cpu; 1280 event.thread = thread; 1281 event.val = count->val; 1282 event.ena = count->ena; 1283 event.run = count->run; 1284 1285 return process(tool, (union perf_event *) &event, NULL, machine); 1286} 1287 1288int perf_event__synthesize_stat_round(struct perf_tool *tool, 1289 u64 evtime, u64 type, 1290 perf_event__handler_t process, 1291 struct machine *machine) 1292{ 1293 struct perf_record_stat_round event; 1294 1295 event.header.type = PERF_RECORD_STAT_ROUND; 1296 event.header.size = sizeof(event); 1297 event.header.misc = 0; 1298 1299 event.time = evtime; 1300 event.type = type; 1301 1302 return process(tool, (union perf_event *) &event, NULL, machine); 1303} 1304 1305size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type, u64 read_format) 1306{ 1307 size_t sz, result = sizeof(struct perf_record_sample); 1308 1309 if (type & PERF_SAMPLE_IDENTIFIER) 1310 result += sizeof(u64); 1311 1312 if (type & PERF_SAMPLE_IP) 1313 result += sizeof(u64); 1314 1315 if (type & PERF_SAMPLE_TID) 1316 result += sizeof(u64); 1317 1318 if (type & PERF_SAMPLE_TIME) 1319 result += sizeof(u64); 1320 1321 if (type & PERF_SAMPLE_ADDR) 1322 result += sizeof(u64); 1323 1324 if (type & PERF_SAMPLE_ID) 1325 result += sizeof(u64); 1326 1327 if (type & PERF_SAMPLE_STREAM_ID) 1328 result += sizeof(u64); 1329 1330 if (type & PERF_SAMPLE_CPU) 1331 result += sizeof(u64); 1332 1333 if (type & PERF_SAMPLE_PERIOD) 1334 result += sizeof(u64); 1335 1336 if (type & PERF_SAMPLE_READ) { 1337 result += sizeof(u64); 1338 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) 1339 result += sizeof(u64); 1340 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) 1341 result += sizeof(u64); 1342 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1343 if (read_format & PERF_FORMAT_GROUP) { 1344 sz = sample->read.group.nr * 1345 sizeof(struct sample_read_value); 1346 result += sz; 1347 } else { 1348 result += sizeof(u64); 1349 } 1350 } 1351 1352 if (type & PERF_SAMPLE_CALLCHAIN) { 1353 sz = (sample->callchain->nr + 1) * sizeof(u64); 1354 result += sz; 1355 } 1356 1357 if (type & PERF_SAMPLE_RAW) { 1358 result += sizeof(u32); 1359 result += sample->raw_size; 1360 } 1361 1362 if (type & PERF_SAMPLE_BRANCH_STACK) { 1363 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1364 /* nr, hw_idx */ 1365 sz += 2 * sizeof(u64); 1366 result += sz; 1367 } 1368 1369 if (type & PERF_SAMPLE_REGS_USER) { 1370 if (sample->user_regs.abi) { 1371 result += sizeof(u64); 1372 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1373 result += sz; 1374 } else { 1375 result += sizeof(u64); 1376 } 1377 } 1378 1379 if (type & PERF_SAMPLE_STACK_USER) { 1380 sz = sample->user_stack.size; 1381 result += sizeof(u64); 1382 if (sz) { 1383 result += sz; 1384 result += sizeof(u64); 1385 } 1386 } 1387 1388 if (type & PERF_SAMPLE_WEIGHT) 1389 result += sizeof(u64); 1390 1391 if (type & PERF_SAMPLE_DATA_SRC) 1392 result += sizeof(u64); 1393 1394 if (type & PERF_SAMPLE_TRANSACTION) 1395 result += sizeof(u64); 1396 1397 if (type & PERF_SAMPLE_REGS_INTR) { 1398 if (sample->intr_regs.abi) { 1399 result += sizeof(u64); 1400 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1401 result += sz; 1402 } else { 1403 result += sizeof(u64); 1404 } 1405 } 1406 1407 if (type & PERF_SAMPLE_PHYS_ADDR) 1408 result += sizeof(u64); 1409 1410 if (type & PERF_SAMPLE_CGROUP) 1411 result += sizeof(u64); 1412 1413 if (type & PERF_SAMPLE_AUX) { 1414 result += sizeof(u64); 1415 result += sample->aux_sample.size; 1416 } 1417 1418 return result; 1419} 1420 1421int perf_event__synthesize_sample(union perf_event *event, u64 type, u64 read_format, 1422 const struct perf_sample *sample) 1423{ 1424 __u64 *array; 1425 size_t sz; 1426 /* 1427 * used for cross-endian analysis. See git commit 65014ab3 1428 * for why this goofiness is needed. 1429 */ 1430 union u64_swap u; 1431 1432 array = event->sample.array; 1433 1434 if (type & PERF_SAMPLE_IDENTIFIER) { 1435 *array = sample->id; 1436 array++; 1437 } 1438 1439 if (type & PERF_SAMPLE_IP) { 1440 *array = sample->ip; 1441 array++; 1442 } 1443 1444 if (type & PERF_SAMPLE_TID) { 1445 u.val32[0] = sample->pid; 1446 u.val32[1] = sample->tid; 1447 *array = u.val64; 1448 array++; 1449 } 1450 1451 if (type & PERF_SAMPLE_TIME) { 1452 *array = sample->time; 1453 array++; 1454 } 1455 1456 if (type & PERF_SAMPLE_ADDR) { 1457 *array = sample->addr; 1458 array++; 1459 } 1460 1461 if (type & PERF_SAMPLE_ID) { 1462 *array = sample->id; 1463 array++; 1464 } 1465 1466 if (type & PERF_SAMPLE_STREAM_ID) { 1467 *array = sample->stream_id; 1468 array++; 1469 } 1470 1471 if (type & PERF_SAMPLE_CPU) { 1472 u.val32[0] = sample->cpu; 1473 u.val32[1] = 0; 1474 *array = u.val64; 1475 array++; 1476 } 1477 1478 if (type & PERF_SAMPLE_PERIOD) { 1479 *array = sample->period; 1480 array++; 1481 } 1482 1483 if (type & PERF_SAMPLE_READ) { 1484 if (read_format & PERF_FORMAT_GROUP) 1485 *array = sample->read.group.nr; 1486 else 1487 *array = sample->read.one.value; 1488 array++; 1489 1490 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) { 1491 *array = sample->read.time_enabled; 1492 array++; 1493 } 1494 1495 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) { 1496 *array = sample->read.time_running; 1497 array++; 1498 } 1499 1500 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */ 1501 if (read_format & PERF_FORMAT_GROUP) { 1502 sz = sample->read.group.nr * 1503 sizeof(struct sample_read_value); 1504 memcpy(array, sample->read.group.values, sz); 1505 array = (void *)array + sz; 1506 } else { 1507 *array = sample->read.one.id; 1508 array++; 1509 } 1510 } 1511 1512 if (type & PERF_SAMPLE_CALLCHAIN) { 1513 sz = (sample->callchain->nr + 1) * sizeof(u64); 1514 memcpy(array, sample->callchain, sz); 1515 array = (void *)array + sz; 1516 } 1517 1518 if (type & PERF_SAMPLE_RAW) { 1519 u.val32[0] = sample->raw_size; 1520 *array = u.val64; 1521 array = (void *)array + sizeof(u32); 1522 1523 memcpy(array, sample->raw_data, sample->raw_size); 1524 array = (void *)array + sample->raw_size; 1525 } 1526 1527 if (type & PERF_SAMPLE_BRANCH_STACK) { 1528 sz = sample->branch_stack->nr * sizeof(struct branch_entry); 1529 /* nr, hw_idx */ 1530 sz += 2 * sizeof(u64); 1531 memcpy(array, sample->branch_stack, sz); 1532 array = (void *)array + sz; 1533 } 1534 1535 if (type & PERF_SAMPLE_REGS_USER) { 1536 if (sample->user_regs.abi) { 1537 *array++ = sample->user_regs.abi; 1538 sz = hweight64(sample->user_regs.mask) * sizeof(u64); 1539 memcpy(array, sample->user_regs.regs, sz); 1540 array = (void *)array + sz; 1541 } else { 1542 *array++ = 0; 1543 } 1544 } 1545 1546 if (type & PERF_SAMPLE_STACK_USER) { 1547 sz = sample->user_stack.size; 1548 *array++ = sz; 1549 if (sz) { 1550 memcpy(array, sample->user_stack.data, sz); 1551 array = (void *)array + sz; 1552 *array++ = sz; 1553 } 1554 } 1555 1556 if (type & PERF_SAMPLE_WEIGHT) { 1557 *array = sample->weight; 1558 array++; 1559 } 1560 1561 if (type & PERF_SAMPLE_DATA_SRC) { 1562 *array = sample->data_src; 1563 array++; 1564 } 1565 1566 if (type & PERF_SAMPLE_TRANSACTION) { 1567 *array = sample->transaction; 1568 array++; 1569 } 1570 1571 if (type & PERF_SAMPLE_REGS_INTR) { 1572 if (sample->intr_regs.abi) { 1573 *array++ = sample->intr_regs.abi; 1574 sz = hweight64(sample->intr_regs.mask) * sizeof(u64); 1575 memcpy(array, sample->intr_regs.regs, sz); 1576 array = (void *)array + sz; 1577 } else { 1578 *array++ = 0; 1579 } 1580 } 1581 1582 if (type & PERF_SAMPLE_PHYS_ADDR) { 1583 *array = sample->phys_addr; 1584 array++; 1585 } 1586 1587 if (type & PERF_SAMPLE_CGROUP) { 1588 *array = sample->cgroup; 1589 array++; 1590 } 1591 1592 if (type & PERF_SAMPLE_AUX) { 1593 sz = sample->aux_sample.size; 1594 *array++ = sz; 1595 memcpy(array, sample->aux_sample.data, sz); 1596 array = (void *)array + sz; 1597 } 1598 1599 return 0; 1600} 1601 1602int perf_event__synthesize_id_index(struct perf_tool *tool, perf_event__handler_t process, 1603 struct evlist *evlist, struct machine *machine) 1604{ 1605 union perf_event *ev; 1606 struct evsel *evsel; 1607 size_t nr = 0, i = 0, sz, max_nr, n; 1608 int err; 1609 1610 pr_debug2("Synthesizing id index\n"); 1611 1612 max_nr = (UINT16_MAX - sizeof(struct perf_record_id_index)) / 1613 sizeof(struct id_index_entry); 1614 1615 evlist__for_each_entry(evlist, evsel) 1616 nr += evsel->core.ids; 1617 1618 n = nr > max_nr ? max_nr : nr; 1619 sz = sizeof(struct perf_record_id_index) + n * sizeof(struct id_index_entry); 1620 ev = zalloc(sz); 1621 if (!ev) 1622 return -ENOMEM; 1623 1624 ev->id_index.header.type = PERF_RECORD_ID_INDEX; 1625 ev->id_index.header.size = sz; 1626 ev->id_index.nr = n; 1627 1628 evlist__for_each_entry(evlist, evsel) { 1629 u32 j; 1630 1631 for (j = 0; j < evsel->core.ids; j++) { 1632 struct id_index_entry *e; 1633 struct perf_sample_id *sid; 1634 1635 if (i >= n) { 1636 err = process(tool, ev, NULL, machine); 1637 if (err) 1638 goto out_err; 1639 nr -= n; 1640 i = 0; 1641 } 1642 1643 e = &ev->id_index.entries[i++]; 1644 1645 e->id = evsel->core.id[j]; 1646 1647 sid = perf_evlist__id2sid(evlist, e->id); 1648 if (!sid) { 1649 free(ev); 1650 return -ENOENT; 1651 } 1652 1653 e->idx = sid->idx; 1654 e->cpu = sid->cpu; 1655 e->tid = sid->tid; 1656 } 1657 } 1658 1659 sz = sizeof(struct perf_record_id_index) + nr * sizeof(struct id_index_entry); 1660 ev->id_index.header.size = sz; 1661 ev->id_index.nr = nr; 1662 1663 err = process(tool, ev, NULL, machine); 1664out_err: 1665 free(ev); 1666 1667 return err; 1668} 1669 1670int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, 1671 struct target *target, struct perf_thread_map *threads, 1672 perf_event__handler_t process, bool data_mmap, 1673 unsigned int nr_threads_synthesize) 1674{ 1675 if (target__has_task(target)) 1676 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); 1677 else if (target__has_cpu(target)) 1678 return perf_event__synthesize_threads(tool, process, 1679 machine, data_mmap, 1680 nr_threads_synthesize); 1681 /* command specified */ 1682 return 0; 1683} 1684 1685int machine__synthesize_threads(struct machine *machine, struct target *target, 1686 struct perf_thread_map *threads, bool data_mmap, 1687 unsigned int nr_threads_synthesize) 1688{ 1689 return __machine__synthesize_threads(machine, NULL, target, threads, 1690 perf_event__process, data_mmap, 1691 nr_threads_synthesize); 1692} 1693 1694static struct perf_record_event_update *event_update_event__new(size_t size, u64 type, u64 id) 1695{ 1696 struct perf_record_event_update *ev; 1697 1698 size += sizeof(*ev); 1699 size = PERF_ALIGN(size, sizeof(u64)); 1700 1701 ev = zalloc(size); 1702 if (ev) { 1703 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1704 ev->header.size = (u16)size; 1705 ev->type = type; 1706 ev->id = id; 1707 } 1708 return ev; 1709} 1710 1711int perf_event__synthesize_event_update_unit(struct perf_tool *tool, struct evsel *evsel, 1712 perf_event__handler_t process) 1713{ 1714 size_t size = strlen(evsel->unit); 1715 struct perf_record_event_update *ev; 1716 int err; 1717 1718 ev = event_update_event__new(size + 1, PERF_EVENT_UPDATE__UNIT, evsel->core.id[0]); 1719 if (ev == NULL) 1720 return -ENOMEM; 1721 1722 strlcpy(ev->data, evsel->unit, size + 1); 1723 err = process(tool, (union perf_event *)ev, NULL, NULL); 1724 free(ev); 1725 return err; 1726} 1727 1728int perf_event__synthesize_event_update_scale(struct perf_tool *tool, struct evsel *evsel, 1729 perf_event__handler_t process) 1730{ 1731 struct perf_record_event_update *ev; 1732 struct perf_record_event_update_scale *ev_data; 1733 int err; 1734 1735 ev = event_update_event__new(sizeof(*ev_data), PERF_EVENT_UPDATE__SCALE, evsel->core.id[0]); 1736 if (ev == NULL) 1737 return -ENOMEM; 1738 1739 ev_data = (struct perf_record_event_update_scale *)ev->data; 1740 ev_data->scale = evsel->scale; 1741 err = process(tool, (union perf_event *)ev, NULL, NULL); 1742 free(ev); 1743 return err; 1744} 1745 1746int perf_event__synthesize_event_update_name(struct perf_tool *tool, struct evsel *evsel, 1747 perf_event__handler_t process) 1748{ 1749 struct perf_record_event_update *ev; 1750 size_t len = strlen(evsel->name); 1751 int err; 1752 1753 ev = event_update_event__new(len + 1, PERF_EVENT_UPDATE__NAME, evsel->core.id[0]); 1754 if (ev == NULL) 1755 return -ENOMEM; 1756 1757 strlcpy(ev->data, evsel->name, len + 1); 1758 err = process(tool, (union perf_event *)ev, NULL, NULL); 1759 free(ev); 1760 return err; 1761} 1762 1763int perf_event__synthesize_event_update_cpus(struct perf_tool *tool, struct evsel *evsel, 1764 perf_event__handler_t process) 1765{ 1766 size_t size = sizeof(struct perf_record_event_update); 1767 struct perf_record_event_update *ev; 1768 int max, err; 1769 u16 type; 1770 1771 if (!evsel->core.own_cpus) 1772 return 0; 1773 1774 ev = cpu_map_data__alloc(evsel->core.own_cpus, &size, &type, &max); 1775 if (!ev) 1776 return -ENOMEM; 1777 1778 ev->header.type = PERF_RECORD_EVENT_UPDATE; 1779 ev->header.size = (u16)size; 1780 ev->type = PERF_EVENT_UPDATE__CPUS; 1781 ev->id = evsel->core.id[0]; 1782 1783 cpu_map_data__synthesize((struct perf_record_cpu_map_data *)ev->data, 1784 evsel->core.own_cpus, type, max); 1785 1786 err = process(tool, (union perf_event *)ev, NULL, NULL); 1787 free(ev); 1788 return err; 1789} 1790 1791int perf_event__synthesize_attrs(struct perf_tool *tool, struct evlist *evlist, 1792 perf_event__handler_t process) 1793{ 1794 struct evsel *evsel; 1795 int err = 0; 1796 1797 evlist__for_each_entry(evlist, evsel) { 1798 err = perf_event__synthesize_attr(tool, &evsel->core.attr, evsel->core.ids, 1799 evsel->core.id, process); 1800 if (err) { 1801 pr_debug("failed to create perf header attribute\n"); 1802 return err; 1803 } 1804 } 1805 1806 return err; 1807} 1808 1809static bool has_unit(struct evsel *evsel) 1810{ 1811 return evsel->unit && *evsel->unit; 1812} 1813 1814static bool has_scale(struct evsel *evsel) 1815{ 1816 return evsel->scale != 1; 1817} 1818 1819int perf_event__synthesize_extra_attr(struct perf_tool *tool, struct evlist *evsel_list, 1820 perf_event__handler_t process, bool is_pipe) 1821{ 1822 struct evsel *evsel; 1823 int err; 1824 1825 /* 1826 * Synthesize other events stuff not carried within 1827 * attr event - unit, scale, name 1828 */ 1829 evlist__for_each_entry(evsel_list, evsel) { 1830 if (!evsel->supported) 1831 continue; 1832 1833 /* 1834 * Synthesize unit and scale only if it's defined. 1835 */ 1836 if (has_unit(evsel)) { 1837 err = perf_event__synthesize_event_update_unit(tool, evsel, process); 1838 if (err < 0) { 1839 pr_err("Couldn't synthesize evsel unit.\n"); 1840 return err; 1841 } 1842 } 1843 1844 if (has_scale(evsel)) { 1845 err = perf_event__synthesize_event_update_scale(tool, evsel, process); 1846 if (err < 0) { 1847 pr_err("Couldn't synthesize evsel evsel.\n"); 1848 return err; 1849 } 1850 } 1851 1852 if (evsel->core.own_cpus) { 1853 err = perf_event__synthesize_event_update_cpus(tool, evsel, process); 1854 if (err < 0) { 1855 pr_err("Couldn't synthesize evsel cpus.\n"); 1856 return err; 1857 } 1858 } 1859 1860 /* 1861 * Name is needed only for pipe output, 1862 * perf.data carries event names. 1863 */ 1864 if (is_pipe) { 1865 err = perf_event__synthesize_event_update_name(tool, evsel, process); 1866 if (err < 0) { 1867 pr_err("Couldn't synthesize evsel name.\n"); 1868 return err; 1869 } 1870 } 1871 } 1872 return 0; 1873} 1874 1875int perf_event__synthesize_attr(struct perf_tool *tool, struct perf_event_attr *attr, 1876 u32 ids, u64 *id, perf_event__handler_t process) 1877{ 1878 union perf_event *ev; 1879 size_t size; 1880 int err; 1881 1882 size = sizeof(struct perf_event_attr); 1883 size = PERF_ALIGN(size, sizeof(u64)); 1884 size += sizeof(struct perf_event_header); 1885 size += ids * sizeof(u64); 1886 1887 ev = zalloc(size); 1888 1889 if (ev == NULL) 1890 return -ENOMEM; 1891 1892 ev->attr.attr = *attr; 1893 memcpy(ev->attr.id, id, ids * sizeof(u64)); 1894 1895 ev->attr.header.type = PERF_RECORD_HEADER_ATTR; 1896 ev->attr.header.size = (u16)size; 1897 1898 if (ev->attr.header.size == size) 1899 err = process(tool, ev, NULL, NULL); 1900 else 1901 err = -E2BIG; 1902 1903 free(ev); 1904 1905 return err; 1906} 1907 1908int perf_event__synthesize_tracing_data(struct perf_tool *tool, int fd, struct evlist *evlist, 1909 perf_event__handler_t process) 1910{ 1911 union perf_event ev; 1912 struct tracing_data *tdata; 1913 ssize_t size = 0, aligned_size = 0, padding; 1914 struct feat_fd ff; 1915 1916 /* 1917 * We are going to store the size of the data followed 1918 * by the data contents. Since the fd descriptor is a pipe, 1919 * we cannot seek back to store the size of the data once 1920 * we know it. Instead we: 1921 * 1922 * - write the tracing data to the temp file 1923 * - get/write the data size to pipe 1924 * - write the tracing data from the temp file 1925 * to the pipe 1926 */ 1927 tdata = tracing_data_get(&evlist->core.entries, fd, true); 1928 if (!tdata) 1929 return -1; 1930 1931 memset(&ev, 0, sizeof(ev)); 1932 1933 ev.tracing_data.header.type = PERF_RECORD_HEADER_TRACING_DATA; 1934 size = tdata->size; 1935 aligned_size = PERF_ALIGN(size, sizeof(u64)); 1936 padding = aligned_size - size; 1937 ev.tracing_data.header.size = sizeof(ev.tracing_data); 1938 ev.tracing_data.size = aligned_size; 1939 1940 process(tool, &ev, NULL, NULL); 1941 1942 /* 1943 * The put function will copy all the tracing data 1944 * stored in temp file to the pipe. 1945 */ 1946 tracing_data_put(tdata); 1947 1948 ff = (struct feat_fd){ .fd = fd }; 1949 if (write_padded(&ff, NULL, 0, padding)) 1950 return -1; 1951 1952 return aligned_size; 1953} 1954 1955int perf_event__synthesize_build_id(struct perf_tool *tool, struct dso *pos, u16 misc, 1956 perf_event__handler_t process, struct machine *machine) 1957{ 1958 union perf_event ev; 1959 size_t len; 1960 1961 if (!pos->hit) 1962 return 0; 1963 1964 memset(&ev, 0, sizeof(ev)); 1965 1966 len = pos->long_name_len + 1; 1967 len = PERF_ALIGN(len, NAME_ALIGN); 1968 memcpy(&ev.build_id.build_id, pos->bid.data, sizeof(pos->bid.data)); 1969 ev.build_id.header.type = PERF_RECORD_HEADER_BUILD_ID; 1970 ev.build_id.header.misc = misc; 1971 ev.build_id.pid = machine->pid; 1972 ev.build_id.header.size = sizeof(ev.build_id) + len; 1973 memcpy(&ev.build_id.filename, pos->long_name, pos->long_name_len); 1974 1975 return process(tool, &ev, NULL, machine); 1976} 1977 1978int perf_event__synthesize_stat_events(struct perf_stat_config *config, struct perf_tool *tool, 1979 struct evlist *evlist, perf_event__handler_t process, bool attrs) 1980{ 1981 int err; 1982 1983 if (attrs) { 1984 err = perf_event__synthesize_attrs(tool, evlist, process); 1985 if (err < 0) { 1986 pr_err("Couldn't synthesize attrs.\n"); 1987 return err; 1988 } 1989 } 1990 1991 err = perf_event__synthesize_extra_attr(tool, evlist, process, attrs); 1992 err = perf_event__synthesize_thread_map2(tool, evlist->core.threads, process, NULL); 1993 if (err < 0) { 1994 pr_err("Couldn't synthesize thread map.\n"); 1995 return err; 1996 } 1997 1998 err = perf_event__synthesize_cpu_map(tool, evlist->core.cpus, process, NULL); 1999 if (err < 0) { 2000 pr_err("Couldn't synthesize thread map.\n"); 2001 return err; 2002 } 2003 2004 err = perf_event__synthesize_stat_config(tool, config, process, NULL); 2005 if (err < 0) { 2006 pr_err("Couldn't synthesize config.\n"); 2007 return err; 2008 } 2009 2010 return 0; 2011} 2012 2013extern const struct perf_header_feature_ops feat_ops[HEADER_LAST_FEATURE]; 2014 2015int perf_event__synthesize_features(struct perf_tool *tool, struct perf_session *session, 2016 struct evlist *evlist, perf_event__handler_t process) 2017{ 2018 struct perf_header *header = &session->header; 2019 struct perf_record_header_feature *fe; 2020 struct feat_fd ff; 2021 size_t sz, sz_hdr; 2022 int feat, ret; 2023 2024 sz_hdr = sizeof(fe->header); 2025 sz = sizeof(union perf_event); 2026 /* get a nice alignment */ 2027 sz = PERF_ALIGN(sz, page_size); 2028 2029 memset(&ff, 0, sizeof(ff)); 2030 2031 ff.buf = malloc(sz); 2032 if (!ff.buf) 2033 return -ENOMEM; 2034 2035 ff.size = sz - sz_hdr; 2036 ff.ph = &session->header; 2037 2038 for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) { 2039 if (!feat_ops[feat].synthesize) { 2040 pr_debug("No record header feature for header :%d\n", feat); 2041 continue; 2042 } 2043 2044 ff.offset = sizeof(*fe); 2045 2046 ret = feat_ops[feat].write(&ff, evlist); 2047 if (ret || ff.offset <= (ssize_t)sizeof(*fe)) { 2048 pr_debug("Error writing feature\n"); 2049 continue; 2050 } 2051 /* ff.buf may have changed due to realloc in do_write() */ 2052 fe = ff.buf; 2053 memset(fe, 0, sizeof(*fe)); 2054 2055 fe->feat_id = feat; 2056 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2057 fe->header.size = ff.offset; 2058 2059 ret = process(tool, ff.buf, NULL, NULL); 2060 if (ret) { 2061 free(ff.buf); 2062 return ret; 2063 } 2064 } 2065 2066 /* Send HEADER_LAST_FEATURE mark. */ 2067 fe = ff.buf; 2068 fe->feat_id = HEADER_LAST_FEATURE; 2069 fe->header.type = PERF_RECORD_HEADER_FEATURE; 2070 fe->header.size = sizeof(*fe); 2071 2072 ret = process(tool, ff.buf, NULL, NULL); 2073 2074 free(ff.buf); 2075 return ret; 2076} 2077