1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * trace_output.c 4 * 5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> 6 * 7 */ 8 #include <linux/module.h> 9 #include <linux/mutex.h> 10 #include <linux/ftrace.h> 11 #include <linux/sched/clock.h> 12 #include <linux/sched/mm.h> 13 14 #include "trace_output.h" 15 16 /* must be a power of 2 */ 17 #define EVENT_HASHSIZE 128 18 19 DECLARE_RWSEM(trace_event_sem); 20 21 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 22 23 static int next_event_type = __TRACE_LAST_TYPE + 1; 24 25 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter) 26 { 27 struct trace_seq *s = &iter->seq; 28 struct trace_entry *entry = iter->ent; 29 struct bputs_entry *field; 30 31 trace_assign_type(field, entry); 32 33 trace_seq_puts(s, field->str); 34 35 return trace_handle_return(s); 36 } 37 38 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) 39 { 40 struct trace_seq *s = &iter->seq; 41 struct trace_entry *entry = iter->ent; 42 struct bprint_entry *field; 43 44 trace_assign_type(field, entry); 45 46 trace_seq_bprintf(s, field->fmt, field->buf); 47 48 return trace_handle_return(s); 49 } 50 51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) 52 { 53 struct trace_seq *s = &iter->seq; 54 struct trace_entry *entry = iter->ent; 55 struct print_entry *field; 56 57 trace_assign_type(field, entry); 58 59 trace_seq_puts(s, field->buf); 60 61 return trace_handle_return(s); 62 } 63 64 const char * 65 trace_print_flags_seq(struct trace_seq *p, const char *delim, 66 unsigned long flags, 67 const struct trace_print_flags *flag_array) 68 { 69 unsigned long mask; 70 const char *str; 71 const char *ret = trace_seq_buffer_ptr(p); 72 int i, first = 1; 73 74 for (i = 0; flag_array[i].name && flags; i++) { 75 76 mask = flag_array[i].mask; 77 if ((flags & mask) != mask) 78 continue; 79 80 str = flag_array[i].name; 81 flags &= ~mask; 82 if (!first && delim) 83 trace_seq_puts(p, delim); 84 else 85 first = 0; 86 trace_seq_puts(p, str); 87 } 88 89 /* check for left over flags */ 90 if (flags) { 91 if (!first && delim) 92 trace_seq_puts(p, delim); 93 trace_seq_printf(p, "0x%lx", flags); 94 } 95 96 trace_seq_putc(p, 0); 97 98 return ret; 99 } 100 EXPORT_SYMBOL(trace_print_flags_seq); 101 102 const char * 103 trace_print_symbols_seq(struct trace_seq *p, unsigned long val, 104 const struct trace_print_flags *symbol_array) 105 { 106 int i; 107 const char *ret = trace_seq_buffer_ptr(p); 108 109 for (i = 0; symbol_array[i].name; i++) { 110 111 if (val != symbol_array[i].mask) 112 continue; 113 114 trace_seq_puts(p, symbol_array[i].name); 115 break; 116 } 117 118 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 119 trace_seq_printf(p, "0x%lx", val); 120 121 trace_seq_putc(p, 0); 122 123 return ret; 124 } 125 EXPORT_SYMBOL(trace_print_symbols_seq); 126 127 #if BITS_PER_LONG == 32 128 const char * 129 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim, 130 unsigned long long flags, 131 const struct trace_print_flags_u64 *flag_array) 132 { 133 unsigned long long mask; 134 const char *str; 135 const char *ret = trace_seq_buffer_ptr(p); 136 int i, first = 1; 137 138 for (i = 0; flag_array[i].name && flags; i++) { 139 140 mask = flag_array[i].mask; 141 if ((flags & mask) != mask) 142 continue; 143 144 str = flag_array[i].name; 145 flags &= ~mask; 146 if (!first && delim) 147 trace_seq_puts(p, delim); 148 else 149 first = 0; 150 trace_seq_puts(p, str); 151 } 152 153 /* check for left over flags */ 154 if (flags) { 155 if (!first && delim) 156 trace_seq_puts(p, delim); 157 trace_seq_printf(p, "0x%llx", flags); 158 } 159 160 trace_seq_putc(p, 0); 161 162 return ret; 163 } 164 EXPORT_SYMBOL(trace_print_flags_seq_u64); 165 166 const char * 167 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, 168 const struct trace_print_flags_u64 *symbol_array) 169 { 170 int i; 171 const char *ret = trace_seq_buffer_ptr(p); 172 173 for (i = 0; symbol_array[i].name; i++) { 174 175 if (val != symbol_array[i].mask) 176 continue; 177 178 trace_seq_puts(p, symbol_array[i].name); 179 break; 180 } 181 182 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 183 trace_seq_printf(p, "0x%llx", val); 184 185 trace_seq_putc(p, 0); 186 187 return ret; 188 } 189 EXPORT_SYMBOL(trace_print_symbols_seq_u64); 190 #endif 191 192 const char * 193 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr, 194 unsigned int bitmask_size) 195 { 196 const char *ret = trace_seq_buffer_ptr(p); 197 198 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8); 199 trace_seq_putc(p, 0); 200 201 return ret; 202 } 203 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq); 204 205 /** 206 * trace_print_hex_seq - print buffer as hex sequence 207 * @p: trace seq struct to write to 208 * @buf: The buffer to print 209 * @buf_len: Length of @buf in bytes 210 * @concatenate: Print @buf as single hex string or with spacing 211 * 212 * Prints the passed buffer as a hex sequence either as a whole, 213 * single hex string if @concatenate is true or with spacing after 214 * each byte in case @concatenate is false. 215 */ 216 const char * 217 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len, 218 bool concatenate) 219 { 220 int i; 221 const char *ret = trace_seq_buffer_ptr(p); 222 223 for (i = 0; i < buf_len; i++) 224 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ", 225 buf[i]); 226 trace_seq_putc(p, 0); 227 228 return ret; 229 } 230 EXPORT_SYMBOL(trace_print_hex_seq); 231 232 const char * 233 trace_print_array_seq(struct trace_seq *p, const void *buf, int count, 234 size_t el_size) 235 { 236 const char *ret = trace_seq_buffer_ptr(p); 237 const char *prefix = ""; 238 void *ptr = (void *)buf; 239 size_t buf_len = count * el_size; 240 241 trace_seq_putc(p, '{'); 242 243 while (ptr < buf + buf_len) { 244 switch (el_size) { 245 case 1: 246 trace_seq_printf(p, "%s0x%x", prefix, 247 *(u8 *)ptr); 248 break; 249 case 2: 250 trace_seq_printf(p, "%s0x%x", prefix, 251 *(u16 *)ptr); 252 break; 253 case 4: 254 trace_seq_printf(p, "%s0x%x", prefix, 255 *(u32 *)ptr); 256 break; 257 case 8: 258 trace_seq_printf(p, "%s0x%llx", prefix, 259 *(u64 *)ptr); 260 break; 261 default: 262 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size, 263 *(u8 *)ptr); 264 el_size = 1; 265 } 266 prefix = ","; 267 ptr += el_size; 268 } 269 270 trace_seq_putc(p, '}'); 271 trace_seq_putc(p, 0); 272 273 return ret; 274 } 275 EXPORT_SYMBOL(trace_print_array_seq); 276 277 int trace_raw_output_prep(struct trace_iterator *iter, 278 struct trace_event *trace_event) 279 { 280 struct trace_event_call *event; 281 struct trace_seq *s = &iter->seq; 282 struct trace_seq *p = &iter->tmp_seq; 283 struct trace_entry *entry; 284 285 event = container_of(trace_event, struct trace_event_call, event); 286 entry = iter->ent; 287 288 if (entry->type != event->event.type) { 289 WARN_ON_ONCE(1); 290 return TRACE_TYPE_UNHANDLED; 291 } 292 293 trace_seq_init(p); 294 trace_seq_printf(s, "%s: ", trace_event_name(event)); 295 296 return trace_handle_return(s); 297 } 298 EXPORT_SYMBOL(trace_raw_output_prep); 299 300 static int trace_output_raw(struct trace_iterator *iter, char *name, 301 char *fmt, va_list ap) 302 { 303 struct trace_seq *s = &iter->seq; 304 305 trace_seq_printf(s, "%s: ", name); 306 trace_seq_vprintf(s, fmt, ap); 307 308 return trace_handle_return(s); 309 } 310 311 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) 312 { 313 va_list ap; 314 int ret; 315 316 va_start(ap, fmt); 317 ret = trace_output_raw(iter, name, fmt, ap); 318 va_end(ap); 319 320 return ret; 321 } 322 EXPORT_SYMBOL_GPL(trace_output_call); 323 324 #ifdef CONFIG_KRETPROBES 325 static inline const char *kretprobed(const char *name) 326 { 327 static const char tramp_name[] = "kretprobe_trampoline"; 328 int size = sizeof(tramp_name); 329 330 if (strncmp(tramp_name, name, size) == 0) 331 return "[unknown/kretprobe'd]"; 332 return name; 333 } 334 #else 335 static inline const char *kretprobed(const char *name) 336 { 337 return name; 338 } 339 #endif /* CONFIG_KRETPROBES */ 340 341 static void 342 seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) 343 { 344 #ifdef CONFIG_KALLSYMS 345 char str[KSYM_SYMBOL_LEN]; 346 const char *name; 347 348 if (offset) 349 sprint_symbol(str, address); 350 else 351 kallsyms_lookup(address, NULL, NULL, NULL, str); 352 name = kretprobed(str); 353 354 if (name && strlen(name)) { 355 trace_seq_puts(s, name); 356 return; 357 } 358 #endif 359 trace_seq_printf(s, "0x%08lx", address); 360 } 361 362 #ifndef CONFIG_64BIT 363 # define IP_FMT "%08lx" 364 #else 365 # define IP_FMT "%016lx" 366 #endif 367 368 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 369 unsigned long ip, unsigned long sym_flags) 370 { 371 struct file *file = NULL; 372 unsigned long vmstart = 0; 373 int ret = 1; 374 375 if (s->full) 376 return 0; 377 378 if (mm) { 379 const struct vm_area_struct *vma; 380 381 down_read(&mm->mmap_sem); 382 vma = find_vma(mm, ip); 383 if (vma) { 384 file = vma->vm_file; 385 vmstart = vma->vm_start; 386 } 387 if (file) { 388 ret = trace_seq_path(s, &file->f_path); 389 if (ret) 390 trace_seq_printf(s, "[+0x%lx]", 391 ip - vmstart); 392 } 393 up_read(&mm->mmap_sem); 394 } 395 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 396 trace_seq_printf(s, " <" IP_FMT ">", ip); 397 return !trace_seq_has_overflowed(s); 398 } 399 400 int 401 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 402 { 403 if (!ip) { 404 trace_seq_putc(s, '0'); 405 goto out; 406 } 407 408 seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET); 409 410 if (sym_flags & TRACE_ITER_SYM_ADDR) 411 trace_seq_printf(s, " <" IP_FMT ">", ip); 412 413 out: 414 return !trace_seq_has_overflowed(s); 415 } 416 417 /** 418 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 419 * @s: trace seq struct to write to 420 * @entry: The trace entry field from the ring buffer 421 * 422 * Prints the generic fields of irqs off, in hard or softirq, preempt 423 * count. 424 */ 425 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 426 { 427 char hardsoft_irq; 428 char need_resched; 429 char irqs_off; 430 int hardirq; 431 int softirq; 432 int nmi; 433 434 nmi = entry->flags & TRACE_FLAG_NMI; 435 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 436 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 437 438 irqs_off = 439 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 440 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 441 '.'; 442 443 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 444 TRACE_FLAG_PREEMPT_RESCHED)) { 445 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 446 need_resched = 'N'; 447 break; 448 case TRACE_FLAG_NEED_RESCHED: 449 need_resched = 'n'; 450 break; 451 case TRACE_FLAG_PREEMPT_RESCHED: 452 need_resched = 'p'; 453 break; 454 default: 455 need_resched = '.'; 456 break; 457 } 458 459 hardsoft_irq = 460 (nmi && hardirq) ? 'Z' : 461 nmi ? 'z' : 462 (hardirq && softirq) ? 'H' : 463 hardirq ? 'h' : 464 softirq ? 's' : 465 '.' ; 466 467 trace_seq_printf(s, "%c%c%c", 468 irqs_off, need_resched, hardsoft_irq); 469 470 if (entry->preempt_count) 471 trace_seq_printf(s, "%x", entry->preempt_count); 472 else 473 trace_seq_putc(s, '.'); 474 475 return !trace_seq_has_overflowed(s); 476 } 477 478 static int 479 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 480 { 481 char comm[TASK_COMM_LEN]; 482 483 trace_find_cmdline(entry->pid, comm); 484 485 trace_seq_printf(s, "%8.8s-%-5d %3d", 486 comm, entry->pid, cpu); 487 488 return trace_print_lat_fmt(s, entry); 489 } 490 491 #undef MARK 492 #define MARK(v, s) {.val = v, .sym = s} 493 /* trace overhead mark */ 494 static const struct trace_mark { 495 unsigned long long val; /* unit: nsec */ 496 char sym; 497 } mark[] = { 498 MARK(1000000000ULL , '$'), /* 1 sec */ 499 MARK(100000000ULL , '@'), /* 100 msec */ 500 MARK(10000000ULL , '*'), /* 10 msec */ 501 MARK(1000000ULL , '#'), /* 1000 usecs */ 502 MARK(100000ULL , '!'), /* 100 usecs */ 503 MARK(10000ULL , '+'), /* 10 usecs */ 504 }; 505 #undef MARK 506 507 char trace_find_mark(unsigned long long d) 508 { 509 int i; 510 int size = ARRAY_SIZE(mark); 511 512 for (i = 0; i < size; i++) { 513 if (d > mark[i].val) 514 break; 515 } 516 517 return (i == size) ? ' ' : mark[i].sym; 518 } 519 520 static int 521 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 522 { 523 struct trace_array *tr = iter->tr; 524 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 525 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 526 unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start; 527 unsigned long long rel_ts = next_ts - iter->ts; 528 struct trace_seq *s = &iter->seq; 529 530 if (in_ns) { 531 abs_ts = ns2usecs(abs_ts); 532 rel_ts = ns2usecs(rel_ts); 533 } 534 535 if (verbose && in_ns) { 536 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 537 unsigned long abs_msec = (unsigned long)abs_ts; 538 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 539 unsigned long rel_msec = (unsigned long)rel_ts; 540 541 trace_seq_printf( 542 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 543 ns2usecs(iter->ts), 544 abs_msec, abs_usec, 545 rel_msec, rel_usec); 546 547 } else if (verbose && !in_ns) { 548 trace_seq_printf( 549 s, "[%016llx] %lld (+%lld): ", 550 iter->ts, abs_ts, rel_ts); 551 552 } else if (!verbose && in_ns) { 553 trace_seq_printf( 554 s, " %4lldus%c: ", 555 abs_ts, 556 trace_find_mark(rel_ts * NSEC_PER_USEC)); 557 558 } else { /* !verbose && !in_ns */ 559 trace_seq_printf(s, " %4lld: ", abs_ts); 560 } 561 562 return !trace_seq_has_overflowed(s); 563 } 564 565 int trace_print_context(struct trace_iterator *iter) 566 { 567 struct trace_array *tr = iter->tr; 568 struct trace_seq *s = &iter->seq; 569 struct trace_entry *entry = iter->ent; 570 unsigned long long t; 571 unsigned long secs, usec_rem; 572 char comm[TASK_COMM_LEN]; 573 574 trace_find_cmdline(entry->pid, comm); 575 576 trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid); 577 578 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 579 unsigned int tgid = trace_find_tgid(entry->pid); 580 581 if (!tgid) 582 trace_seq_printf(s, "(-----) "); 583 else 584 trace_seq_printf(s, "(%5d) ", tgid); 585 } 586 587 trace_seq_printf(s, "[%03d] ", iter->cpu); 588 589 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 590 trace_print_lat_fmt(s, entry); 591 592 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 593 t = ns2usecs(iter->ts); 594 usec_rem = do_div(t, USEC_PER_SEC); 595 secs = (unsigned long)t; 596 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem); 597 } else 598 trace_seq_printf(s, " %12llu: ", iter->ts); 599 600 return !trace_seq_has_overflowed(s); 601 } 602 603 int trace_print_lat_context(struct trace_iterator *iter) 604 { 605 struct trace_array *tr = iter->tr; 606 /* trace_find_next_entry will reset ent_size */ 607 int ent_size = iter->ent_size; 608 struct trace_seq *s = &iter->seq; 609 u64 next_ts; 610 struct trace_entry *entry = iter->ent, 611 *next_entry = trace_find_next_entry(iter, NULL, 612 &next_ts); 613 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 614 615 /* Restore the original ent_size */ 616 iter->ent_size = ent_size; 617 618 if (!next_entry) 619 next_ts = iter->ts; 620 621 if (verbose) { 622 char comm[TASK_COMM_LEN]; 623 624 trace_find_cmdline(entry->pid, comm); 625 626 trace_seq_printf( 627 s, "%16s %5d %3d %d %08x %08lx ", 628 comm, entry->pid, iter->cpu, entry->flags, 629 entry->preempt_count, iter->idx); 630 } else { 631 lat_print_generic(s, entry, iter->cpu); 632 } 633 634 lat_print_timestamp(iter, next_ts); 635 636 return !trace_seq_has_overflowed(s); 637 } 638 639 /** 640 * ftrace_find_event - find a registered event 641 * @type: the type of event to look for 642 * 643 * Returns an event of type @type otherwise NULL 644 * Called with trace_event_read_lock() held. 645 */ 646 struct trace_event *ftrace_find_event(int type) 647 { 648 struct trace_event *event; 649 unsigned key; 650 651 key = type & (EVENT_HASHSIZE - 1); 652 653 hlist_for_each_entry(event, &event_hash[key], node) { 654 if (event->type == type) 655 return event; 656 } 657 658 return NULL; 659 } 660 661 static LIST_HEAD(ftrace_event_list); 662 663 static int trace_search_list(struct list_head **list) 664 { 665 struct trace_event *e; 666 int last = __TRACE_LAST_TYPE; 667 668 if (list_empty(&ftrace_event_list)) { 669 *list = &ftrace_event_list; 670 return last + 1; 671 } 672 673 /* 674 * We used up all possible max events, 675 * lets see if somebody freed one. 676 */ 677 list_for_each_entry(e, &ftrace_event_list, list) { 678 if (e->type != last + 1) 679 break; 680 last++; 681 } 682 683 /* Did we used up all 65 thousand events??? */ 684 if ((last + 1) > TRACE_EVENT_TYPE_MAX) 685 return 0; 686 687 *list = &e->list; 688 return last + 1; 689 } 690 691 void trace_event_read_lock(void) 692 { 693 down_read(&trace_event_sem); 694 } 695 696 void trace_event_read_unlock(void) 697 { 698 up_read(&trace_event_sem); 699 } 700 701 /** 702 * register_trace_event - register output for an event type 703 * @event: the event type to register 704 * 705 * Event types are stored in a hash and this hash is used to 706 * find a way to print an event. If the @event->type is set 707 * then it will use that type, otherwise it will assign a 708 * type to use. 709 * 710 * If you assign your own type, please make sure it is added 711 * to the trace_type enum in trace.h, to avoid collisions 712 * with the dynamic types. 713 * 714 * Returns the event type number or zero on error. 715 */ 716 int register_trace_event(struct trace_event *event) 717 { 718 unsigned key; 719 int ret = 0; 720 721 down_write(&trace_event_sem); 722 723 if (WARN_ON(!event)) 724 goto out; 725 726 if (WARN_ON(!event->funcs)) 727 goto out; 728 729 INIT_LIST_HEAD(&event->list); 730 731 if (!event->type) { 732 struct list_head *list = NULL; 733 734 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 735 736 event->type = trace_search_list(&list); 737 if (!event->type) 738 goto out; 739 740 } else { 741 742 event->type = next_event_type++; 743 list = &ftrace_event_list; 744 } 745 746 if (WARN_ON(ftrace_find_event(event->type))) 747 goto out; 748 749 list_add_tail(&event->list, list); 750 751 } else if (event->type > __TRACE_LAST_TYPE) { 752 printk(KERN_WARNING "Need to add type to trace.h\n"); 753 WARN_ON(1); 754 goto out; 755 } else { 756 /* Is this event already used */ 757 if (ftrace_find_event(event->type)) 758 goto out; 759 } 760 761 if (event->funcs->trace == NULL) 762 event->funcs->trace = trace_nop_print; 763 if (event->funcs->raw == NULL) 764 event->funcs->raw = trace_nop_print; 765 if (event->funcs->hex == NULL) 766 event->funcs->hex = trace_nop_print; 767 if (event->funcs->binary == NULL) 768 event->funcs->binary = trace_nop_print; 769 770 key = event->type & (EVENT_HASHSIZE - 1); 771 772 hlist_add_head(&event->node, &event_hash[key]); 773 774 ret = event->type; 775 out: 776 up_write(&trace_event_sem); 777 778 return ret; 779 } 780 EXPORT_SYMBOL_GPL(register_trace_event); 781 782 /* 783 * Used by module code with the trace_event_sem held for write. 784 */ 785 int __unregister_trace_event(struct trace_event *event) 786 { 787 hlist_del(&event->node); 788 list_del(&event->list); 789 return 0; 790 } 791 792 /** 793 * unregister_trace_event - remove a no longer used event 794 * @event: the event to remove 795 */ 796 int unregister_trace_event(struct trace_event *event) 797 { 798 down_write(&trace_event_sem); 799 __unregister_trace_event(event); 800 up_write(&trace_event_sem); 801 802 return 0; 803 } 804 EXPORT_SYMBOL_GPL(unregister_trace_event); 805 806 /* 807 * Standard events 808 */ 809 810 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 811 struct trace_event *event) 812 { 813 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 814 815 return trace_handle_return(&iter->seq); 816 } 817 818 /* TRACE_FN */ 819 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 820 struct trace_event *event) 821 { 822 struct ftrace_entry *field; 823 struct trace_seq *s = &iter->seq; 824 825 trace_assign_type(field, iter->ent); 826 827 seq_print_ip_sym(s, field->ip, flags); 828 829 if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { 830 trace_seq_puts(s, " <-"); 831 seq_print_ip_sym(s, field->parent_ip, flags); 832 } 833 834 trace_seq_putc(s, '\n'); 835 836 return trace_handle_return(s); 837 } 838 839 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 840 struct trace_event *event) 841 { 842 struct ftrace_entry *field; 843 844 trace_assign_type(field, iter->ent); 845 846 trace_seq_printf(&iter->seq, "%lx %lx\n", 847 field->ip, 848 field->parent_ip); 849 850 return trace_handle_return(&iter->seq); 851 } 852 853 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 854 struct trace_event *event) 855 { 856 struct ftrace_entry *field; 857 struct trace_seq *s = &iter->seq; 858 859 trace_assign_type(field, iter->ent); 860 861 SEQ_PUT_HEX_FIELD(s, field->ip); 862 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 863 864 return trace_handle_return(s); 865 } 866 867 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 868 struct trace_event *event) 869 { 870 struct ftrace_entry *field; 871 struct trace_seq *s = &iter->seq; 872 873 trace_assign_type(field, iter->ent); 874 875 SEQ_PUT_FIELD(s, field->ip); 876 SEQ_PUT_FIELD(s, field->parent_ip); 877 878 return trace_handle_return(s); 879 } 880 881 static struct trace_event_functions trace_fn_funcs = { 882 .trace = trace_fn_trace, 883 .raw = trace_fn_raw, 884 .hex = trace_fn_hex, 885 .binary = trace_fn_bin, 886 }; 887 888 static struct trace_event trace_fn_event = { 889 .type = TRACE_FN, 890 .funcs = &trace_fn_funcs, 891 }; 892 893 /* TRACE_CTX an TRACE_WAKE */ 894 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 895 char *delim) 896 { 897 struct ctx_switch_entry *field; 898 char comm[TASK_COMM_LEN]; 899 int S, T; 900 901 902 trace_assign_type(field, iter->ent); 903 904 T = task_index_to_char(field->next_state); 905 S = task_index_to_char(field->prev_state); 906 trace_find_cmdline(field->next_pid, comm); 907 trace_seq_printf(&iter->seq, 908 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", 909 field->prev_pid, 910 field->prev_prio, 911 S, delim, 912 field->next_cpu, 913 field->next_pid, 914 field->next_prio, 915 T, comm); 916 917 return trace_handle_return(&iter->seq); 918 } 919 920 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 921 struct trace_event *event) 922 { 923 return trace_ctxwake_print(iter, "==>"); 924 } 925 926 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 927 int flags, struct trace_event *event) 928 { 929 return trace_ctxwake_print(iter, " +"); 930 } 931 932 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 933 { 934 struct ctx_switch_entry *field; 935 int T; 936 937 trace_assign_type(field, iter->ent); 938 939 if (!S) 940 S = task_index_to_char(field->prev_state); 941 T = task_index_to_char(field->next_state); 942 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 943 field->prev_pid, 944 field->prev_prio, 945 S, 946 field->next_cpu, 947 field->next_pid, 948 field->next_prio, 949 T); 950 951 return trace_handle_return(&iter->seq); 952 } 953 954 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 955 struct trace_event *event) 956 { 957 return trace_ctxwake_raw(iter, 0); 958 } 959 960 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 961 struct trace_event *event) 962 { 963 return trace_ctxwake_raw(iter, '+'); 964 } 965 966 967 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 968 { 969 struct ctx_switch_entry *field; 970 struct trace_seq *s = &iter->seq; 971 int T; 972 973 trace_assign_type(field, iter->ent); 974 975 if (!S) 976 S = task_index_to_char(field->prev_state); 977 T = task_index_to_char(field->next_state); 978 979 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 980 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 981 SEQ_PUT_HEX_FIELD(s, S); 982 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 983 SEQ_PUT_HEX_FIELD(s, field->next_pid); 984 SEQ_PUT_HEX_FIELD(s, field->next_prio); 985 SEQ_PUT_HEX_FIELD(s, T); 986 987 return trace_handle_return(s); 988 } 989 990 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 991 struct trace_event *event) 992 { 993 return trace_ctxwake_hex(iter, 0); 994 } 995 996 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 997 struct trace_event *event) 998 { 999 return trace_ctxwake_hex(iter, '+'); 1000 } 1001 1002 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1003 int flags, struct trace_event *event) 1004 { 1005 struct ctx_switch_entry *field; 1006 struct trace_seq *s = &iter->seq; 1007 1008 trace_assign_type(field, iter->ent); 1009 1010 SEQ_PUT_FIELD(s, field->prev_pid); 1011 SEQ_PUT_FIELD(s, field->prev_prio); 1012 SEQ_PUT_FIELD(s, field->prev_state); 1013 SEQ_PUT_FIELD(s, field->next_cpu); 1014 SEQ_PUT_FIELD(s, field->next_pid); 1015 SEQ_PUT_FIELD(s, field->next_prio); 1016 SEQ_PUT_FIELD(s, field->next_state); 1017 1018 return trace_handle_return(s); 1019 } 1020 1021 static struct trace_event_functions trace_ctx_funcs = { 1022 .trace = trace_ctx_print, 1023 .raw = trace_ctx_raw, 1024 .hex = trace_ctx_hex, 1025 .binary = trace_ctxwake_bin, 1026 }; 1027 1028 static struct trace_event trace_ctx_event = { 1029 .type = TRACE_CTX, 1030 .funcs = &trace_ctx_funcs, 1031 }; 1032 1033 static struct trace_event_functions trace_wake_funcs = { 1034 .trace = trace_wake_print, 1035 .raw = trace_wake_raw, 1036 .hex = trace_wake_hex, 1037 .binary = trace_ctxwake_bin, 1038 }; 1039 1040 static struct trace_event trace_wake_event = { 1041 .type = TRACE_WAKE, 1042 .funcs = &trace_wake_funcs, 1043 }; 1044 1045 /* TRACE_STACK */ 1046 1047 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1048 int flags, struct trace_event *event) 1049 { 1050 struct stack_entry *field; 1051 struct trace_seq *s = &iter->seq; 1052 unsigned long *p; 1053 unsigned long *end; 1054 1055 trace_assign_type(field, iter->ent); 1056 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1057 1058 trace_seq_puts(s, "<stack trace>\n"); 1059 1060 for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) { 1061 1062 if (trace_seq_has_overflowed(s)) 1063 break; 1064 1065 trace_seq_puts(s, " => "); 1066 seq_print_ip_sym(s, *p, flags); 1067 trace_seq_putc(s, '\n'); 1068 } 1069 1070 return trace_handle_return(s); 1071 } 1072 1073 static struct trace_event_functions trace_stack_funcs = { 1074 .trace = trace_stack_print, 1075 }; 1076 1077 static struct trace_event trace_stack_event = { 1078 .type = TRACE_STACK, 1079 .funcs = &trace_stack_funcs, 1080 }; 1081 1082 /* TRACE_USER_STACK */ 1083 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1084 int flags, struct trace_event *event) 1085 { 1086 struct trace_array *tr = iter->tr; 1087 struct userstack_entry *field; 1088 struct trace_seq *s = &iter->seq; 1089 struct mm_struct *mm = NULL; 1090 unsigned int i; 1091 1092 trace_assign_type(field, iter->ent); 1093 1094 trace_seq_puts(s, "<user stack trace>\n"); 1095 1096 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1097 struct task_struct *task; 1098 /* 1099 * we do the lookup on the thread group leader, 1100 * since individual threads might have already quit! 1101 */ 1102 rcu_read_lock(); 1103 task = find_task_by_vpid(field->tgid); 1104 if (task) 1105 mm = get_task_mm(task); 1106 rcu_read_unlock(); 1107 } 1108 1109 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1110 unsigned long ip = field->caller[i]; 1111 1112 if (ip == ULONG_MAX || trace_seq_has_overflowed(s)) 1113 break; 1114 1115 trace_seq_puts(s, " => "); 1116 1117 if (!ip) { 1118 trace_seq_puts(s, "??"); 1119 trace_seq_putc(s, '\n'); 1120 continue; 1121 } 1122 1123 seq_print_user_ip(s, mm, ip, flags); 1124 trace_seq_putc(s, '\n'); 1125 } 1126 1127 if (mm) 1128 mmput(mm); 1129 1130 return trace_handle_return(s); 1131 } 1132 1133 static struct trace_event_functions trace_user_stack_funcs = { 1134 .trace = trace_user_stack_print, 1135 }; 1136 1137 static struct trace_event trace_user_stack_event = { 1138 .type = TRACE_USER_STACK, 1139 .funcs = &trace_user_stack_funcs, 1140 }; 1141 1142 /* TRACE_HWLAT */ 1143 static enum print_line_t 1144 trace_hwlat_print(struct trace_iterator *iter, int flags, 1145 struct trace_event *event) 1146 { 1147 struct trace_entry *entry = iter->ent; 1148 struct trace_seq *s = &iter->seq; 1149 struct hwlat_entry *field; 1150 1151 trace_assign_type(field, entry); 1152 1153 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld", 1154 field->seqnum, 1155 field->duration, 1156 field->outer_duration, 1157 (long long)field->timestamp.tv_sec, 1158 field->timestamp.tv_nsec); 1159 1160 if (field->nmi_count) { 1161 /* 1162 * The generic sched_clock() is not NMI safe, thus 1163 * we only record the count and not the time. 1164 */ 1165 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1166 trace_seq_printf(s, " nmi-total:%llu", 1167 field->nmi_total_ts); 1168 trace_seq_printf(s, " nmi-count:%u", 1169 field->nmi_count); 1170 } 1171 1172 trace_seq_putc(s, '\n'); 1173 1174 return trace_handle_return(s); 1175 } 1176 1177 1178 static enum print_line_t 1179 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1180 struct trace_event *event) 1181 { 1182 struct hwlat_entry *field; 1183 struct trace_seq *s = &iter->seq; 1184 1185 trace_assign_type(field, iter->ent); 1186 1187 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1188 field->duration, 1189 field->outer_duration, 1190 (long long)field->timestamp.tv_sec, 1191 field->timestamp.tv_nsec, 1192 field->seqnum); 1193 1194 return trace_handle_return(s); 1195 } 1196 1197 static struct trace_event_functions trace_hwlat_funcs = { 1198 .trace = trace_hwlat_print, 1199 .raw = trace_hwlat_raw, 1200 }; 1201 1202 static struct trace_event trace_hwlat_event = { 1203 .type = TRACE_HWLAT, 1204 .funcs = &trace_hwlat_funcs, 1205 }; 1206 1207 /* TRACE_BPUTS */ 1208 static enum print_line_t 1209 trace_bputs_print(struct trace_iterator *iter, int flags, 1210 struct trace_event *event) 1211 { 1212 struct trace_entry *entry = iter->ent; 1213 struct trace_seq *s = &iter->seq; 1214 struct bputs_entry *field; 1215 1216 trace_assign_type(field, entry); 1217 1218 seq_print_ip_sym(s, field->ip, flags); 1219 trace_seq_puts(s, ": "); 1220 trace_seq_puts(s, field->str); 1221 1222 return trace_handle_return(s); 1223 } 1224 1225 1226 static enum print_line_t 1227 trace_bputs_raw(struct trace_iterator *iter, int flags, 1228 struct trace_event *event) 1229 { 1230 struct bputs_entry *field; 1231 struct trace_seq *s = &iter->seq; 1232 1233 trace_assign_type(field, iter->ent); 1234 1235 trace_seq_printf(s, ": %lx : ", field->ip); 1236 trace_seq_puts(s, field->str); 1237 1238 return trace_handle_return(s); 1239 } 1240 1241 static struct trace_event_functions trace_bputs_funcs = { 1242 .trace = trace_bputs_print, 1243 .raw = trace_bputs_raw, 1244 }; 1245 1246 static struct trace_event trace_bputs_event = { 1247 .type = TRACE_BPUTS, 1248 .funcs = &trace_bputs_funcs, 1249 }; 1250 1251 /* TRACE_BPRINT */ 1252 static enum print_line_t 1253 trace_bprint_print(struct trace_iterator *iter, int flags, 1254 struct trace_event *event) 1255 { 1256 struct trace_entry *entry = iter->ent; 1257 struct trace_seq *s = &iter->seq; 1258 struct bprint_entry *field; 1259 1260 trace_assign_type(field, entry); 1261 1262 seq_print_ip_sym(s, field->ip, flags); 1263 trace_seq_puts(s, ": "); 1264 trace_seq_bprintf(s, field->fmt, field->buf); 1265 1266 return trace_handle_return(s); 1267 } 1268 1269 1270 static enum print_line_t 1271 trace_bprint_raw(struct trace_iterator *iter, int flags, 1272 struct trace_event *event) 1273 { 1274 struct bprint_entry *field; 1275 struct trace_seq *s = &iter->seq; 1276 1277 trace_assign_type(field, iter->ent); 1278 1279 trace_seq_printf(s, ": %lx : ", field->ip); 1280 trace_seq_bprintf(s, field->fmt, field->buf); 1281 1282 return trace_handle_return(s); 1283 } 1284 1285 static struct trace_event_functions trace_bprint_funcs = { 1286 .trace = trace_bprint_print, 1287 .raw = trace_bprint_raw, 1288 }; 1289 1290 static struct trace_event trace_bprint_event = { 1291 .type = TRACE_BPRINT, 1292 .funcs = &trace_bprint_funcs, 1293 }; 1294 1295 /* TRACE_PRINT */ 1296 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1297 int flags, struct trace_event *event) 1298 { 1299 struct print_entry *field; 1300 struct trace_seq *s = &iter->seq; 1301 1302 trace_assign_type(field, iter->ent); 1303 1304 seq_print_ip_sym(s, field->ip, flags); 1305 trace_seq_printf(s, ": %s", field->buf); 1306 1307 return trace_handle_return(s); 1308 } 1309 1310 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1311 struct trace_event *event) 1312 { 1313 struct print_entry *field; 1314 1315 trace_assign_type(field, iter->ent); 1316 1317 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1318 1319 return trace_handle_return(&iter->seq); 1320 } 1321 1322 static struct trace_event_functions trace_print_funcs = { 1323 .trace = trace_print_print, 1324 .raw = trace_print_raw, 1325 }; 1326 1327 static struct trace_event trace_print_event = { 1328 .type = TRACE_PRINT, 1329 .funcs = &trace_print_funcs, 1330 }; 1331 1332 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1333 struct trace_event *event) 1334 { 1335 struct raw_data_entry *field; 1336 int i; 1337 1338 trace_assign_type(field, iter->ent); 1339 1340 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1341 1342 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1343 trace_seq_printf(&iter->seq, " %02x", 1344 (unsigned char)field->buf[i]); 1345 1346 trace_seq_putc(&iter->seq, '\n'); 1347 1348 return trace_handle_return(&iter->seq); 1349 } 1350 1351 static struct trace_event_functions trace_raw_data_funcs = { 1352 .trace = trace_raw_data, 1353 .raw = trace_raw_data, 1354 }; 1355 1356 static struct trace_event trace_raw_data_event = { 1357 .type = TRACE_RAW_DATA, 1358 .funcs = &trace_raw_data_funcs, 1359 }; 1360 1361 1362 static struct trace_event *events[] __initdata = { 1363 &trace_fn_event, 1364 &trace_ctx_event, 1365 &trace_wake_event, 1366 &trace_stack_event, 1367 &trace_user_stack_event, 1368 &trace_bputs_event, 1369 &trace_bprint_event, 1370 &trace_print_event, 1371 &trace_hwlat_event, 1372 &trace_raw_data_event, 1373 NULL 1374 }; 1375 1376 __init static int init_events(void) 1377 { 1378 struct trace_event *event; 1379 int i, ret; 1380 1381 for (i = 0; events[i]; i++) { 1382 event = events[i]; 1383 1384 ret = register_trace_event(event); 1385 if (!ret) { 1386 printk(KERN_WARNING "event %d failed to register\n", 1387 event->type); 1388 WARN_ON_ONCE(1); 1389 } 1390 } 1391 1392 return 0; 1393 } 1394 early_initcall(init_events); 1395