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/kprobes.h> 12 #include <linux/sched/clock.h> 13 #include <linux/sched/mm.h> 14 15 #include "trace_output.h" 16 17 /* must be a power of 2 */ 18 #define EVENT_HASHSIZE 128 19 20 DECLARE_RWSEM(trace_event_sem); 21 22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 23 24 static int next_event_type = __TRACE_LAST_TYPE; 25 26 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter) 27 { 28 struct trace_seq *s = &iter->seq; 29 struct trace_entry *entry = iter->ent; 30 struct bputs_entry *field; 31 32 trace_assign_type(field, entry); 33 34 trace_seq_puts(s, field->str); 35 36 return trace_handle_return(s); 37 } 38 39 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter) 40 { 41 struct trace_seq *s = &iter->seq; 42 struct trace_entry *entry = iter->ent; 43 struct bprint_entry *field; 44 45 trace_assign_type(field, entry); 46 47 trace_seq_bprintf(s, field->fmt, field->buf); 48 49 return trace_handle_return(s); 50 } 51 52 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter) 53 { 54 struct trace_seq *s = &iter->seq; 55 struct trace_entry *entry = iter->ent; 56 struct print_entry *field; 57 58 trace_assign_type(field, entry); 59 60 trace_seq_puts(s, field->buf); 61 62 return trace_handle_return(s); 63 } 64 65 const char * 66 trace_print_flags_seq(struct trace_seq *p, const char *delim, 67 unsigned long flags, 68 const struct trace_print_flags *flag_array) 69 { 70 unsigned long mask; 71 const char *str; 72 const char *ret = trace_seq_buffer_ptr(p); 73 int i, first = 1; 74 75 for (i = 0; flag_array[i].name && flags; i++) { 76 77 mask = flag_array[i].mask; 78 if ((flags & mask) != mask) 79 continue; 80 81 str = flag_array[i].name; 82 flags &= ~mask; 83 if (!first && delim) 84 trace_seq_puts(p, delim); 85 else 86 first = 0; 87 trace_seq_puts(p, str); 88 } 89 90 /* check for left over flags */ 91 if (flags) { 92 if (!first && delim) 93 trace_seq_puts(p, delim); 94 trace_seq_printf(p, "0x%lx", flags); 95 } 96 97 trace_seq_putc(p, 0); 98 99 return ret; 100 } 101 EXPORT_SYMBOL(trace_print_flags_seq); 102 103 const char * 104 trace_print_symbols_seq(struct trace_seq *p, unsigned long val, 105 const struct trace_print_flags *symbol_array) 106 { 107 int i; 108 const char *ret = trace_seq_buffer_ptr(p); 109 110 for (i = 0; symbol_array[i].name; i++) { 111 112 if (val != symbol_array[i].mask) 113 continue; 114 115 trace_seq_puts(p, symbol_array[i].name); 116 break; 117 } 118 119 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 120 trace_seq_printf(p, "0x%lx", val); 121 122 trace_seq_putc(p, 0); 123 124 return ret; 125 } 126 EXPORT_SYMBOL(trace_print_symbols_seq); 127 128 #if BITS_PER_LONG == 32 129 const char * 130 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim, 131 unsigned long long flags, 132 const struct trace_print_flags_u64 *flag_array) 133 { 134 unsigned long long mask; 135 const char *str; 136 const char *ret = trace_seq_buffer_ptr(p); 137 int i, first = 1; 138 139 for (i = 0; flag_array[i].name && flags; i++) { 140 141 mask = flag_array[i].mask; 142 if ((flags & mask) != mask) 143 continue; 144 145 str = flag_array[i].name; 146 flags &= ~mask; 147 if (!first && delim) 148 trace_seq_puts(p, delim); 149 else 150 first = 0; 151 trace_seq_puts(p, str); 152 } 153 154 /* check for left over flags */ 155 if (flags) { 156 if (!first && delim) 157 trace_seq_puts(p, delim); 158 trace_seq_printf(p, "0x%llx", flags); 159 } 160 161 trace_seq_putc(p, 0); 162 163 return ret; 164 } 165 EXPORT_SYMBOL(trace_print_flags_seq_u64); 166 167 const char * 168 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val, 169 const struct trace_print_flags_u64 *symbol_array) 170 { 171 int i; 172 const char *ret = trace_seq_buffer_ptr(p); 173 174 for (i = 0; symbol_array[i].name; i++) { 175 176 if (val != symbol_array[i].mask) 177 continue; 178 179 trace_seq_puts(p, symbol_array[i].name); 180 break; 181 } 182 183 if (ret == (const char *)(trace_seq_buffer_ptr(p))) 184 trace_seq_printf(p, "0x%llx", val); 185 186 trace_seq_putc(p, 0); 187 188 return ret; 189 } 190 EXPORT_SYMBOL(trace_print_symbols_seq_u64); 191 #endif 192 193 const char * 194 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr, 195 unsigned int bitmask_size) 196 { 197 const char *ret = trace_seq_buffer_ptr(p); 198 199 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8); 200 trace_seq_putc(p, 0); 201 202 return ret; 203 } 204 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq); 205 206 /** 207 * trace_print_hex_seq - print buffer as hex sequence 208 * @p: trace seq struct to write to 209 * @buf: The buffer to print 210 * @buf_len: Length of @buf in bytes 211 * @concatenate: Print @buf as single hex string or with spacing 212 * 213 * Prints the passed buffer as a hex sequence either as a whole, 214 * single hex string if @concatenate is true or with spacing after 215 * each byte in case @concatenate is false. 216 */ 217 const char * 218 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len, 219 bool concatenate) 220 { 221 int i; 222 const char *ret = trace_seq_buffer_ptr(p); 223 const char *fmt = concatenate ? "%*phN" : "%*ph"; 224 225 for (i = 0; i < buf_len; i += 16) 226 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]); 227 trace_seq_putc(p, 0); 228 229 return ret; 230 } 231 EXPORT_SYMBOL(trace_print_hex_seq); 232 233 const char * 234 trace_print_array_seq(struct trace_seq *p, const void *buf, int count, 235 size_t el_size) 236 { 237 const char *ret = trace_seq_buffer_ptr(p); 238 const char *prefix = ""; 239 void *ptr = (void *)buf; 240 size_t buf_len = count * el_size; 241 242 trace_seq_putc(p, '{'); 243 244 while (ptr < buf + buf_len) { 245 switch (el_size) { 246 case 1: 247 trace_seq_printf(p, "%s0x%x", prefix, 248 *(u8 *)ptr); 249 break; 250 case 2: 251 trace_seq_printf(p, "%s0x%x", prefix, 252 *(u16 *)ptr); 253 break; 254 case 4: 255 trace_seq_printf(p, "%s0x%x", prefix, 256 *(u32 *)ptr); 257 break; 258 case 8: 259 trace_seq_printf(p, "%s0x%llx", prefix, 260 *(u64 *)ptr); 261 break; 262 default: 263 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size, 264 *(u8 *)ptr); 265 el_size = 1; 266 } 267 prefix = ","; 268 ptr += el_size; 269 } 270 271 trace_seq_putc(p, '}'); 272 trace_seq_putc(p, 0); 273 274 return ret; 275 } 276 EXPORT_SYMBOL(trace_print_array_seq); 277 278 const char * 279 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str, 280 int prefix_type, int rowsize, int groupsize, 281 const void *buf, size_t len, bool ascii) 282 { 283 const char *ret = trace_seq_buffer_ptr(p); 284 285 trace_seq_putc(p, '\n'); 286 trace_seq_hex_dump(p, prefix_str, prefix_type, 287 rowsize, groupsize, buf, len, ascii); 288 trace_seq_putc(p, 0); 289 return ret; 290 } 291 EXPORT_SYMBOL(trace_print_hex_dump_seq); 292 293 int trace_raw_output_prep(struct trace_iterator *iter, 294 struct trace_event *trace_event) 295 { 296 struct trace_event_call *event; 297 struct trace_seq *s = &iter->seq; 298 struct trace_seq *p = &iter->tmp_seq; 299 struct trace_entry *entry; 300 301 event = container_of(trace_event, struct trace_event_call, event); 302 entry = iter->ent; 303 304 if (entry->type != event->event.type) { 305 WARN_ON_ONCE(1); 306 return TRACE_TYPE_UNHANDLED; 307 } 308 309 trace_seq_init(p); 310 trace_seq_printf(s, "%s: ", trace_event_name(event)); 311 312 return trace_handle_return(s); 313 } 314 EXPORT_SYMBOL(trace_raw_output_prep); 315 316 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...) 317 { 318 va_list ap; 319 320 va_start(ap, fmt); 321 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap); 322 va_end(ap); 323 } 324 EXPORT_SYMBOL(trace_event_printf); 325 326 static int trace_output_raw(struct trace_iterator *iter, char *name, 327 char *fmt, va_list ap) 328 { 329 struct trace_seq *s = &iter->seq; 330 331 trace_seq_printf(s, "%s: ", name); 332 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap); 333 334 return trace_handle_return(s); 335 } 336 337 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) 338 { 339 va_list ap; 340 int ret; 341 342 va_start(ap, fmt); 343 ret = trace_output_raw(iter, name, fmt, ap); 344 va_end(ap); 345 346 return ret; 347 } 348 EXPORT_SYMBOL_GPL(trace_output_call); 349 350 static inline const char *kretprobed(const char *name, unsigned long addr) 351 { 352 if (is_kretprobe_trampoline(addr)) 353 return "[unknown/kretprobe'd]"; 354 return name; 355 } 356 357 void 358 trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) 359 { 360 #ifdef CONFIG_KALLSYMS 361 char str[KSYM_SYMBOL_LEN]; 362 const char *name; 363 364 if (offset) 365 sprint_symbol(str, address); 366 else 367 kallsyms_lookup(address, NULL, NULL, NULL, str); 368 name = kretprobed(str, address); 369 370 if (name && strlen(name)) { 371 trace_seq_puts(s, name); 372 return; 373 } 374 #endif 375 trace_seq_printf(s, "0x%08lx", address); 376 } 377 378 #ifndef CONFIG_64BIT 379 # define IP_FMT "%08lx" 380 #else 381 # define IP_FMT "%016lx" 382 #endif 383 384 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 385 unsigned long ip, unsigned long sym_flags) 386 { 387 struct file *file = NULL; 388 unsigned long vmstart = 0; 389 int ret = 1; 390 391 if (s->full) 392 return 0; 393 394 if (mm) { 395 const struct vm_area_struct *vma; 396 397 mmap_read_lock(mm); 398 vma = find_vma(mm, ip); 399 if (vma) { 400 file = vma->vm_file; 401 vmstart = vma->vm_start; 402 } 403 if (file) { 404 ret = trace_seq_path(s, &file->f_path); 405 if (ret) 406 trace_seq_printf(s, "[+0x%lx]", 407 ip - vmstart); 408 } 409 mmap_read_unlock(mm); 410 } 411 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 412 trace_seq_printf(s, " <" IP_FMT ">", ip); 413 return !trace_seq_has_overflowed(s); 414 } 415 416 int 417 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 418 { 419 if (!ip) { 420 trace_seq_putc(s, '0'); 421 goto out; 422 } 423 424 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET); 425 426 if (sym_flags & TRACE_ITER_SYM_ADDR) 427 trace_seq_printf(s, " <" IP_FMT ">", ip); 428 429 out: 430 return !trace_seq_has_overflowed(s); 431 } 432 433 /** 434 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 435 * @s: trace seq struct to write to 436 * @entry: The trace entry field from the ring buffer 437 * 438 * Prints the generic fields of irqs off, in hard or softirq, preempt 439 * count. 440 */ 441 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 442 { 443 char hardsoft_irq; 444 char need_resched; 445 char irqs_off; 446 int hardirq; 447 int softirq; 448 int nmi; 449 450 nmi = entry->flags & TRACE_FLAG_NMI; 451 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 452 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 453 454 irqs_off = 455 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 456 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 457 '.'; 458 459 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 460 TRACE_FLAG_PREEMPT_RESCHED)) { 461 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 462 need_resched = 'N'; 463 break; 464 case TRACE_FLAG_NEED_RESCHED: 465 need_resched = 'n'; 466 break; 467 case TRACE_FLAG_PREEMPT_RESCHED: 468 need_resched = 'p'; 469 break; 470 default: 471 need_resched = '.'; 472 break; 473 } 474 475 hardsoft_irq = 476 (nmi && hardirq) ? 'Z' : 477 nmi ? 'z' : 478 (hardirq && softirq) ? 'H' : 479 hardirq ? 'h' : 480 softirq ? 's' : 481 '.' ; 482 483 trace_seq_printf(s, "%c%c%c", 484 irqs_off, need_resched, hardsoft_irq); 485 486 if (entry->preempt_count & 0xf) 487 trace_seq_printf(s, "%x", entry->preempt_count & 0xf); 488 else 489 trace_seq_putc(s, '.'); 490 491 if (entry->preempt_count & 0xf0) 492 trace_seq_printf(s, "%x", entry->preempt_count >> 4); 493 else 494 trace_seq_putc(s, '.'); 495 496 return !trace_seq_has_overflowed(s); 497 } 498 499 static int 500 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 501 { 502 char comm[TASK_COMM_LEN]; 503 504 trace_find_cmdline(entry->pid, comm); 505 506 trace_seq_printf(s, "%8.8s-%-7d %3d", 507 comm, entry->pid, cpu); 508 509 return trace_print_lat_fmt(s, entry); 510 } 511 512 #undef MARK 513 #define MARK(v, s) {.val = v, .sym = s} 514 /* trace overhead mark */ 515 static const struct trace_mark { 516 unsigned long long val; /* unit: nsec */ 517 char sym; 518 } mark[] = { 519 MARK(1000000000ULL , '$'), /* 1 sec */ 520 MARK(100000000ULL , '@'), /* 100 msec */ 521 MARK(10000000ULL , '*'), /* 10 msec */ 522 MARK(1000000ULL , '#'), /* 1000 usecs */ 523 MARK(100000ULL , '!'), /* 100 usecs */ 524 MARK(10000ULL , '+'), /* 10 usecs */ 525 }; 526 #undef MARK 527 528 char trace_find_mark(unsigned long long d) 529 { 530 int i; 531 int size = ARRAY_SIZE(mark); 532 533 for (i = 0; i < size; i++) { 534 if (d > mark[i].val) 535 break; 536 } 537 538 return (i == size) ? ' ' : mark[i].sym; 539 } 540 541 static int 542 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 543 { 544 struct trace_array *tr = iter->tr; 545 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 546 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 547 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start; 548 unsigned long long rel_ts = next_ts - iter->ts; 549 struct trace_seq *s = &iter->seq; 550 551 if (in_ns) { 552 abs_ts = ns2usecs(abs_ts); 553 rel_ts = ns2usecs(rel_ts); 554 } 555 556 if (verbose && in_ns) { 557 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 558 unsigned long abs_msec = (unsigned long)abs_ts; 559 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 560 unsigned long rel_msec = (unsigned long)rel_ts; 561 562 trace_seq_printf( 563 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 564 ns2usecs(iter->ts), 565 abs_msec, abs_usec, 566 rel_msec, rel_usec); 567 568 } else if (verbose && !in_ns) { 569 trace_seq_printf( 570 s, "[%016llx] %lld (+%lld): ", 571 iter->ts, abs_ts, rel_ts); 572 573 } else if (!verbose && in_ns) { 574 trace_seq_printf( 575 s, " %4lldus%c: ", 576 abs_ts, 577 trace_find_mark(rel_ts * NSEC_PER_USEC)); 578 579 } else { /* !verbose && !in_ns */ 580 trace_seq_printf(s, " %4lld: ", abs_ts); 581 } 582 583 return !trace_seq_has_overflowed(s); 584 } 585 586 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter, 587 unsigned long long ts) 588 { 589 unsigned long secs, usec_rem; 590 unsigned long long t; 591 592 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 593 t = ns2usecs(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", ts); 599 } 600 601 int trace_print_context(struct trace_iterator *iter) 602 { 603 struct trace_array *tr = iter->tr; 604 struct trace_seq *s = &iter->seq; 605 struct trace_entry *entry = iter->ent; 606 char comm[TASK_COMM_LEN]; 607 608 trace_find_cmdline(entry->pid, comm); 609 610 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid); 611 612 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 613 unsigned int tgid = trace_find_tgid(entry->pid); 614 615 if (!tgid) 616 trace_seq_printf(s, "(-------) "); 617 else 618 trace_seq_printf(s, "(%7d) ", tgid); 619 } 620 621 trace_seq_printf(s, "[%03d] ", iter->cpu); 622 623 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 624 trace_print_lat_fmt(s, entry); 625 626 trace_print_time(s, iter, iter->ts); 627 trace_seq_puts(s, ": "); 628 629 return !trace_seq_has_overflowed(s); 630 } 631 632 int trace_print_lat_context(struct trace_iterator *iter) 633 { 634 struct trace_entry *entry, *next_entry; 635 struct trace_array *tr = iter->tr; 636 struct trace_seq *s = &iter->seq; 637 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 638 u64 next_ts; 639 640 next_entry = trace_find_next_entry(iter, NULL, &next_ts); 641 if (!next_entry) 642 next_ts = iter->ts; 643 644 /* trace_find_next_entry() may change iter->ent */ 645 entry = iter->ent; 646 647 if (verbose) { 648 char comm[TASK_COMM_LEN]; 649 650 trace_find_cmdline(entry->pid, comm); 651 652 trace_seq_printf( 653 s, "%16s %7d %3d %d %08x %08lx ", 654 comm, entry->pid, iter->cpu, entry->flags, 655 entry->preempt_count & 0xf, iter->idx); 656 } else { 657 lat_print_generic(s, entry, iter->cpu); 658 } 659 660 lat_print_timestamp(iter, next_ts); 661 662 return !trace_seq_has_overflowed(s); 663 } 664 665 /** 666 * ftrace_find_event - find a registered event 667 * @type: the type of event to look for 668 * 669 * Returns an event of type @type otherwise NULL 670 * Called with trace_event_read_lock() held. 671 */ 672 struct trace_event *ftrace_find_event(int type) 673 { 674 struct trace_event *event; 675 unsigned key; 676 677 key = type & (EVENT_HASHSIZE - 1); 678 679 hlist_for_each_entry(event, &event_hash[key], node) { 680 if (event->type == type) 681 return event; 682 } 683 684 return NULL; 685 } 686 687 static LIST_HEAD(ftrace_event_list); 688 689 static int trace_search_list(struct list_head **list) 690 { 691 struct trace_event *e; 692 int next = __TRACE_LAST_TYPE; 693 694 if (list_empty(&ftrace_event_list)) { 695 *list = &ftrace_event_list; 696 return next; 697 } 698 699 /* 700 * We used up all possible max events, 701 * lets see if somebody freed one. 702 */ 703 list_for_each_entry(e, &ftrace_event_list, list) { 704 if (e->type != next) 705 break; 706 next++; 707 } 708 709 /* Did we used up all 65 thousand events??? */ 710 if (next > TRACE_EVENT_TYPE_MAX) 711 return 0; 712 713 *list = &e->list; 714 return next; 715 } 716 717 void trace_event_read_lock(void) 718 { 719 down_read(&trace_event_sem); 720 } 721 722 void trace_event_read_unlock(void) 723 { 724 up_read(&trace_event_sem); 725 } 726 727 /** 728 * register_trace_event - register output for an event type 729 * @event: the event type to register 730 * 731 * Event types are stored in a hash and this hash is used to 732 * find a way to print an event. If the @event->type is set 733 * then it will use that type, otherwise it will assign a 734 * type to use. 735 * 736 * If you assign your own type, please make sure it is added 737 * to the trace_type enum in trace.h, to avoid collisions 738 * with the dynamic types. 739 * 740 * Returns the event type number or zero on error. 741 */ 742 int register_trace_event(struct trace_event *event) 743 { 744 unsigned key; 745 int ret = 0; 746 747 down_write(&trace_event_sem); 748 749 if (WARN_ON(!event)) 750 goto out; 751 752 if (WARN_ON(!event->funcs)) 753 goto out; 754 755 INIT_LIST_HEAD(&event->list); 756 757 if (!event->type) { 758 struct list_head *list = NULL; 759 760 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 761 762 event->type = trace_search_list(&list); 763 if (!event->type) 764 goto out; 765 766 } else { 767 768 event->type = next_event_type++; 769 list = &ftrace_event_list; 770 } 771 772 if (WARN_ON(ftrace_find_event(event->type))) 773 goto out; 774 775 list_add_tail(&event->list, list); 776 777 } else if (event->type > __TRACE_LAST_TYPE) { 778 printk(KERN_WARNING "Need to add type to trace.h\n"); 779 WARN_ON(1); 780 goto out; 781 } else { 782 /* Is this event already used */ 783 if (ftrace_find_event(event->type)) 784 goto out; 785 } 786 787 if (event->funcs->trace == NULL) 788 event->funcs->trace = trace_nop_print; 789 if (event->funcs->raw == NULL) 790 event->funcs->raw = trace_nop_print; 791 if (event->funcs->hex == NULL) 792 event->funcs->hex = trace_nop_print; 793 if (event->funcs->binary == NULL) 794 event->funcs->binary = trace_nop_print; 795 796 key = event->type & (EVENT_HASHSIZE - 1); 797 798 hlist_add_head(&event->node, &event_hash[key]); 799 800 ret = event->type; 801 out: 802 up_write(&trace_event_sem); 803 804 return ret; 805 } 806 EXPORT_SYMBOL_GPL(register_trace_event); 807 808 /* 809 * Used by module code with the trace_event_sem held for write. 810 */ 811 int __unregister_trace_event(struct trace_event *event) 812 { 813 hlist_del(&event->node); 814 list_del(&event->list); 815 return 0; 816 } 817 818 /** 819 * unregister_trace_event - remove a no longer used event 820 * @event: the event to remove 821 */ 822 int unregister_trace_event(struct trace_event *event) 823 { 824 down_write(&trace_event_sem); 825 __unregister_trace_event(event); 826 up_write(&trace_event_sem); 827 828 return 0; 829 } 830 EXPORT_SYMBOL_GPL(unregister_trace_event); 831 832 /* 833 * Standard events 834 */ 835 836 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 837 struct trace_event *event) 838 { 839 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 840 841 return trace_handle_return(&iter->seq); 842 } 843 844 static void print_fn_trace(struct trace_seq *s, unsigned long ip, 845 unsigned long parent_ip, int flags) 846 { 847 seq_print_ip_sym(s, ip, flags); 848 849 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) { 850 trace_seq_puts(s, " <-"); 851 seq_print_ip_sym(s, parent_ip, flags); 852 } 853 } 854 855 /* TRACE_FN */ 856 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 857 struct trace_event *event) 858 { 859 struct ftrace_entry *field; 860 struct trace_seq *s = &iter->seq; 861 862 trace_assign_type(field, iter->ent); 863 864 print_fn_trace(s, field->ip, field->parent_ip, flags); 865 trace_seq_putc(s, '\n'); 866 867 return trace_handle_return(s); 868 } 869 870 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 871 struct trace_event *event) 872 { 873 struct ftrace_entry *field; 874 875 trace_assign_type(field, iter->ent); 876 877 trace_seq_printf(&iter->seq, "%lx %lx\n", 878 field->ip, 879 field->parent_ip); 880 881 return trace_handle_return(&iter->seq); 882 } 883 884 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 885 struct trace_event *event) 886 { 887 struct ftrace_entry *field; 888 struct trace_seq *s = &iter->seq; 889 890 trace_assign_type(field, iter->ent); 891 892 SEQ_PUT_HEX_FIELD(s, field->ip); 893 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 894 895 return trace_handle_return(s); 896 } 897 898 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 899 struct trace_event *event) 900 { 901 struct ftrace_entry *field; 902 struct trace_seq *s = &iter->seq; 903 904 trace_assign_type(field, iter->ent); 905 906 SEQ_PUT_FIELD(s, field->ip); 907 SEQ_PUT_FIELD(s, field->parent_ip); 908 909 return trace_handle_return(s); 910 } 911 912 static struct trace_event_functions trace_fn_funcs = { 913 .trace = trace_fn_trace, 914 .raw = trace_fn_raw, 915 .hex = trace_fn_hex, 916 .binary = trace_fn_bin, 917 }; 918 919 static struct trace_event trace_fn_event = { 920 .type = TRACE_FN, 921 .funcs = &trace_fn_funcs, 922 }; 923 924 /* TRACE_CTX an TRACE_WAKE */ 925 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 926 char *delim) 927 { 928 struct ctx_switch_entry *field; 929 char comm[TASK_COMM_LEN]; 930 int S, T; 931 932 933 trace_assign_type(field, iter->ent); 934 935 T = task_index_to_char(field->next_state); 936 S = task_index_to_char(field->prev_state); 937 trace_find_cmdline(field->next_pid, comm); 938 trace_seq_printf(&iter->seq, 939 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 940 field->prev_pid, 941 field->prev_prio, 942 S, delim, 943 field->next_cpu, 944 field->next_pid, 945 field->next_prio, 946 T, comm); 947 948 return trace_handle_return(&iter->seq); 949 } 950 951 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 952 struct trace_event *event) 953 { 954 return trace_ctxwake_print(iter, "==>"); 955 } 956 957 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 958 int flags, struct trace_event *event) 959 { 960 return trace_ctxwake_print(iter, " +"); 961 } 962 963 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 964 { 965 struct ctx_switch_entry *field; 966 int T; 967 968 trace_assign_type(field, iter->ent); 969 970 if (!S) 971 S = task_index_to_char(field->prev_state); 972 T = task_index_to_char(field->next_state); 973 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 974 field->prev_pid, 975 field->prev_prio, 976 S, 977 field->next_cpu, 978 field->next_pid, 979 field->next_prio, 980 T); 981 982 return trace_handle_return(&iter->seq); 983 } 984 985 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 986 struct trace_event *event) 987 { 988 return trace_ctxwake_raw(iter, 0); 989 } 990 991 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 992 struct trace_event *event) 993 { 994 return trace_ctxwake_raw(iter, '+'); 995 } 996 997 998 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 999 { 1000 struct ctx_switch_entry *field; 1001 struct trace_seq *s = &iter->seq; 1002 int T; 1003 1004 trace_assign_type(field, iter->ent); 1005 1006 if (!S) 1007 S = task_index_to_char(field->prev_state); 1008 T = task_index_to_char(field->next_state); 1009 1010 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 1011 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 1012 SEQ_PUT_HEX_FIELD(s, S); 1013 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 1014 SEQ_PUT_HEX_FIELD(s, field->next_pid); 1015 SEQ_PUT_HEX_FIELD(s, field->next_prio); 1016 SEQ_PUT_HEX_FIELD(s, T); 1017 1018 return trace_handle_return(s); 1019 } 1020 1021 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1022 struct trace_event *event) 1023 { 1024 return trace_ctxwake_hex(iter, 0); 1025 } 1026 1027 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1028 struct trace_event *event) 1029 { 1030 return trace_ctxwake_hex(iter, '+'); 1031 } 1032 1033 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1034 int flags, struct trace_event *event) 1035 { 1036 struct ctx_switch_entry *field; 1037 struct trace_seq *s = &iter->seq; 1038 1039 trace_assign_type(field, iter->ent); 1040 1041 SEQ_PUT_FIELD(s, field->prev_pid); 1042 SEQ_PUT_FIELD(s, field->prev_prio); 1043 SEQ_PUT_FIELD(s, field->prev_state); 1044 SEQ_PUT_FIELD(s, field->next_cpu); 1045 SEQ_PUT_FIELD(s, field->next_pid); 1046 SEQ_PUT_FIELD(s, field->next_prio); 1047 SEQ_PUT_FIELD(s, field->next_state); 1048 1049 return trace_handle_return(s); 1050 } 1051 1052 static struct trace_event_functions trace_ctx_funcs = { 1053 .trace = trace_ctx_print, 1054 .raw = trace_ctx_raw, 1055 .hex = trace_ctx_hex, 1056 .binary = trace_ctxwake_bin, 1057 }; 1058 1059 static struct trace_event trace_ctx_event = { 1060 .type = TRACE_CTX, 1061 .funcs = &trace_ctx_funcs, 1062 }; 1063 1064 static struct trace_event_functions trace_wake_funcs = { 1065 .trace = trace_wake_print, 1066 .raw = trace_wake_raw, 1067 .hex = trace_wake_hex, 1068 .binary = trace_ctxwake_bin, 1069 }; 1070 1071 static struct trace_event trace_wake_event = { 1072 .type = TRACE_WAKE, 1073 .funcs = &trace_wake_funcs, 1074 }; 1075 1076 /* TRACE_STACK */ 1077 1078 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1079 int flags, struct trace_event *event) 1080 { 1081 struct stack_entry *field; 1082 struct trace_seq *s = &iter->seq; 1083 unsigned long *p; 1084 unsigned long *end; 1085 1086 trace_assign_type(field, iter->ent); 1087 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1088 1089 trace_seq_puts(s, "<stack trace>\n"); 1090 1091 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1092 1093 if (trace_seq_has_overflowed(s)) 1094 break; 1095 1096 trace_seq_puts(s, " => "); 1097 seq_print_ip_sym(s, *p, flags); 1098 trace_seq_putc(s, '\n'); 1099 } 1100 1101 return trace_handle_return(s); 1102 } 1103 1104 static struct trace_event_functions trace_stack_funcs = { 1105 .trace = trace_stack_print, 1106 }; 1107 1108 static struct trace_event trace_stack_event = { 1109 .type = TRACE_STACK, 1110 .funcs = &trace_stack_funcs, 1111 }; 1112 1113 /* TRACE_USER_STACK */ 1114 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1115 int flags, struct trace_event *event) 1116 { 1117 struct trace_array *tr = iter->tr; 1118 struct userstack_entry *field; 1119 struct trace_seq *s = &iter->seq; 1120 struct mm_struct *mm = NULL; 1121 unsigned int i; 1122 1123 trace_assign_type(field, iter->ent); 1124 1125 trace_seq_puts(s, "<user stack trace>\n"); 1126 1127 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1128 struct task_struct *task; 1129 /* 1130 * we do the lookup on the thread group leader, 1131 * since individual threads might have already quit! 1132 */ 1133 rcu_read_lock(); 1134 task = find_task_by_vpid(field->tgid); 1135 if (task) 1136 mm = get_task_mm(task); 1137 rcu_read_unlock(); 1138 } 1139 1140 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1141 unsigned long ip = field->caller[i]; 1142 1143 if (!ip || trace_seq_has_overflowed(s)) 1144 break; 1145 1146 trace_seq_puts(s, " => "); 1147 seq_print_user_ip(s, mm, ip, flags); 1148 trace_seq_putc(s, '\n'); 1149 } 1150 1151 if (mm) 1152 mmput(mm); 1153 1154 return trace_handle_return(s); 1155 } 1156 1157 static struct trace_event_functions trace_user_stack_funcs = { 1158 .trace = trace_user_stack_print, 1159 }; 1160 1161 static struct trace_event trace_user_stack_event = { 1162 .type = TRACE_USER_STACK, 1163 .funcs = &trace_user_stack_funcs, 1164 }; 1165 1166 /* TRACE_HWLAT */ 1167 static enum print_line_t 1168 trace_hwlat_print(struct trace_iterator *iter, int flags, 1169 struct trace_event *event) 1170 { 1171 struct trace_entry *entry = iter->ent; 1172 struct trace_seq *s = &iter->seq; 1173 struct hwlat_entry *field; 1174 1175 trace_assign_type(field, entry); 1176 1177 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1178 field->seqnum, 1179 field->duration, 1180 field->outer_duration, 1181 (long long)field->timestamp.tv_sec, 1182 field->timestamp.tv_nsec, field->count); 1183 1184 if (field->nmi_count) { 1185 /* 1186 * The generic sched_clock() is not NMI safe, thus 1187 * we only record the count and not the time. 1188 */ 1189 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1190 trace_seq_printf(s, " nmi-total:%llu", 1191 field->nmi_total_ts); 1192 trace_seq_printf(s, " nmi-count:%u", 1193 field->nmi_count); 1194 } 1195 1196 trace_seq_putc(s, '\n'); 1197 1198 return trace_handle_return(s); 1199 } 1200 1201 static enum print_line_t 1202 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1203 struct trace_event *event) 1204 { 1205 struct hwlat_entry *field; 1206 struct trace_seq *s = &iter->seq; 1207 1208 trace_assign_type(field, iter->ent); 1209 1210 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1211 field->duration, 1212 field->outer_duration, 1213 (long long)field->timestamp.tv_sec, 1214 field->timestamp.tv_nsec, 1215 field->seqnum); 1216 1217 return trace_handle_return(s); 1218 } 1219 1220 static struct trace_event_functions trace_hwlat_funcs = { 1221 .trace = trace_hwlat_print, 1222 .raw = trace_hwlat_raw, 1223 }; 1224 1225 static struct trace_event trace_hwlat_event = { 1226 .type = TRACE_HWLAT, 1227 .funcs = &trace_hwlat_funcs, 1228 }; 1229 1230 /* TRACE_OSNOISE */ 1231 static enum print_line_t 1232 trace_osnoise_print(struct trace_iterator *iter, int flags, 1233 struct trace_event *event) 1234 { 1235 struct trace_entry *entry = iter->ent; 1236 struct trace_seq *s = &iter->seq; 1237 struct osnoise_entry *field; 1238 u64 ratio, ratio_dec; 1239 u64 net_runtime; 1240 1241 trace_assign_type(field, entry); 1242 1243 /* 1244 * compute the available % of cpu time. 1245 */ 1246 net_runtime = field->runtime - field->noise; 1247 ratio = net_runtime * 10000000; 1248 do_div(ratio, field->runtime); 1249 ratio_dec = do_div(ratio, 100000); 1250 1251 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu", 1252 field->runtime, 1253 field->noise, 1254 ratio, ratio_dec, 1255 field->max_sample); 1256 1257 trace_seq_printf(s, " %6u", field->hw_count); 1258 trace_seq_printf(s, " %6u", field->nmi_count); 1259 trace_seq_printf(s, " %6u", field->irq_count); 1260 trace_seq_printf(s, " %6u", field->softirq_count); 1261 trace_seq_printf(s, " %6u", field->thread_count); 1262 1263 trace_seq_putc(s, '\n'); 1264 1265 return trace_handle_return(s); 1266 } 1267 1268 static enum print_line_t 1269 trace_osnoise_raw(struct trace_iterator *iter, int flags, 1270 struct trace_event *event) 1271 { 1272 struct osnoise_entry *field; 1273 struct trace_seq *s = &iter->seq; 1274 1275 trace_assign_type(field, iter->ent); 1276 1277 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n", 1278 field->runtime, 1279 field->noise, 1280 field->max_sample, 1281 field->hw_count, 1282 field->nmi_count, 1283 field->irq_count, 1284 field->softirq_count, 1285 field->thread_count); 1286 1287 return trace_handle_return(s); 1288 } 1289 1290 static struct trace_event_functions trace_osnoise_funcs = { 1291 .trace = trace_osnoise_print, 1292 .raw = trace_osnoise_raw, 1293 }; 1294 1295 static struct trace_event trace_osnoise_event = { 1296 .type = TRACE_OSNOISE, 1297 .funcs = &trace_osnoise_funcs, 1298 }; 1299 1300 /* TRACE_TIMERLAT */ 1301 static enum print_line_t 1302 trace_timerlat_print(struct trace_iterator *iter, int flags, 1303 struct trace_event *event) 1304 { 1305 struct trace_entry *entry = iter->ent; 1306 struct trace_seq *s = &iter->seq; 1307 struct timerlat_entry *field; 1308 1309 trace_assign_type(field, entry); 1310 1311 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n", 1312 field->seqnum, 1313 field->context ? "thread" : "irq", 1314 field->timer_latency); 1315 1316 return trace_handle_return(s); 1317 } 1318 1319 static enum print_line_t 1320 trace_timerlat_raw(struct trace_iterator *iter, int flags, 1321 struct trace_event *event) 1322 { 1323 struct timerlat_entry *field; 1324 struct trace_seq *s = &iter->seq; 1325 1326 trace_assign_type(field, iter->ent); 1327 1328 trace_seq_printf(s, "%u %d %llu\n", 1329 field->seqnum, 1330 field->context, 1331 field->timer_latency); 1332 1333 return trace_handle_return(s); 1334 } 1335 1336 static struct trace_event_functions trace_timerlat_funcs = { 1337 .trace = trace_timerlat_print, 1338 .raw = trace_timerlat_raw, 1339 }; 1340 1341 static struct trace_event trace_timerlat_event = { 1342 .type = TRACE_TIMERLAT, 1343 .funcs = &trace_timerlat_funcs, 1344 }; 1345 1346 /* TRACE_BPUTS */ 1347 static enum print_line_t 1348 trace_bputs_print(struct trace_iterator *iter, int flags, 1349 struct trace_event *event) 1350 { 1351 struct trace_entry *entry = iter->ent; 1352 struct trace_seq *s = &iter->seq; 1353 struct bputs_entry *field; 1354 1355 trace_assign_type(field, entry); 1356 1357 seq_print_ip_sym(s, field->ip, flags); 1358 trace_seq_puts(s, ": "); 1359 trace_seq_puts(s, field->str); 1360 1361 return trace_handle_return(s); 1362 } 1363 1364 1365 static enum print_line_t 1366 trace_bputs_raw(struct trace_iterator *iter, int flags, 1367 struct trace_event *event) 1368 { 1369 struct bputs_entry *field; 1370 struct trace_seq *s = &iter->seq; 1371 1372 trace_assign_type(field, iter->ent); 1373 1374 trace_seq_printf(s, ": %lx : ", field->ip); 1375 trace_seq_puts(s, field->str); 1376 1377 return trace_handle_return(s); 1378 } 1379 1380 static struct trace_event_functions trace_bputs_funcs = { 1381 .trace = trace_bputs_print, 1382 .raw = trace_bputs_raw, 1383 }; 1384 1385 static struct trace_event trace_bputs_event = { 1386 .type = TRACE_BPUTS, 1387 .funcs = &trace_bputs_funcs, 1388 }; 1389 1390 /* TRACE_BPRINT */ 1391 static enum print_line_t 1392 trace_bprint_print(struct trace_iterator *iter, int flags, 1393 struct trace_event *event) 1394 { 1395 struct trace_entry *entry = iter->ent; 1396 struct trace_seq *s = &iter->seq; 1397 struct bprint_entry *field; 1398 1399 trace_assign_type(field, entry); 1400 1401 seq_print_ip_sym(s, field->ip, flags); 1402 trace_seq_puts(s, ": "); 1403 trace_seq_bprintf(s, field->fmt, field->buf); 1404 1405 return trace_handle_return(s); 1406 } 1407 1408 1409 static enum print_line_t 1410 trace_bprint_raw(struct trace_iterator *iter, int flags, 1411 struct trace_event *event) 1412 { 1413 struct bprint_entry *field; 1414 struct trace_seq *s = &iter->seq; 1415 1416 trace_assign_type(field, iter->ent); 1417 1418 trace_seq_printf(s, ": %lx : ", field->ip); 1419 trace_seq_bprintf(s, field->fmt, field->buf); 1420 1421 return trace_handle_return(s); 1422 } 1423 1424 static struct trace_event_functions trace_bprint_funcs = { 1425 .trace = trace_bprint_print, 1426 .raw = trace_bprint_raw, 1427 }; 1428 1429 static struct trace_event trace_bprint_event = { 1430 .type = TRACE_BPRINT, 1431 .funcs = &trace_bprint_funcs, 1432 }; 1433 1434 /* TRACE_PRINT */ 1435 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1436 int flags, struct trace_event *event) 1437 { 1438 struct print_entry *field; 1439 struct trace_seq *s = &iter->seq; 1440 1441 trace_assign_type(field, iter->ent); 1442 1443 seq_print_ip_sym(s, field->ip, flags); 1444 trace_seq_printf(s, ": %s", field->buf); 1445 1446 return trace_handle_return(s); 1447 } 1448 1449 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1450 struct trace_event *event) 1451 { 1452 struct print_entry *field; 1453 1454 trace_assign_type(field, iter->ent); 1455 1456 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1457 1458 return trace_handle_return(&iter->seq); 1459 } 1460 1461 static struct trace_event_functions trace_print_funcs = { 1462 .trace = trace_print_print, 1463 .raw = trace_print_raw, 1464 }; 1465 1466 static struct trace_event trace_print_event = { 1467 .type = TRACE_PRINT, 1468 .funcs = &trace_print_funcs, 1469 }; 1470 1471 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1472 struct trace_event *event) 1473 { 1474 struct raw_data_entry *field; 1475 int i; 1476 1477 trace_assign_type(field, iter->ent); 1478 1479 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1480 1481 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1482 trace_seq_printf(&iter->seq, " %02x", 1483 (unsigned char)field->buf[i]); 1484 1485 trace_seq_putc(&iter->seq, '\n'); 1486 1487 return trace_handle_return(&iter->seq); 1488 } 1489 1490 static struct trace_event_functions trace_raw_data_funcs = { 1491 .trace = trace_raw_data, 1492 .raw = trace_raw_data, 1493 }; 1494 1495 static struct trace_event trace_raw_data_event = { 1496 .type = TRACE_RAW_DATA, 1497 .funcs = &trace_raw_data_funcs, 1498 }; 1499 1500 static enum print_line_t 1501 trace_func_repeats_raw(struct trace_iterator *iter, int flags, 1502 struct trace_event *event) 1503 { 1504 struct func_repeats_entry *field; 1505 struct trace_seq *s = &iter->seq; 1506 1507 trace_assign_type(field, iter->ent); 1508 1509 trace_seq_printf(s, "%lu %lu %u %llu\n", 1510 field->ip, 1511 field->parent_ip, 1512 field->count, 1513 FUNC_REPEATS_GET_DELTA_TS(field)); 1514 1515 return trace_handle_return(s); 1516 } 1517 1518 static enum print_line_t 1519 trace_func_repeats_print(struct trace_iterator *iter, int flags, 1520 struct trace_event *event) 1521 { 1522 struct func_repeats_entry *field; 1523 struct trace_seq *s = &iter->seq; 1524 1525 trace_assign_type(field, iter->ent); 1526 1527 print_fn_trace(s, field->ip, field->parent_ip, flags); 1528 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count); 1529 trace_print_time(s, iter, 1530 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field)); 1531 trace_seq_puts(s, ")\n"); 1532 1533 return trace_handle_return(s); 1534 } 1535 1536 static struct trace_event_functions trace_func_repeats_funcs = { 1537 .trace = trace_func_repeats_print, 1538 .raw = trace_func_repeats_raw, 1539 }; 1540 1541 static struct trace_event trace_func_repeats_event = { 1542 .type = TRACE_FUNC_REPEATS, 1543 .funcs = &trace_func_repeats_funcs, 1544 }; 1545 1546 static struct trace_event *events[] __initdata = { 1547 &trace_fn_event, 1548 &trace_ctx_event, 1549 &trace_wake_event, 1550 &trace_stack_event, 1551 &trace_user_stack_event, 1552 &trace_bputs_event, 1553 &trace_bprint_event, 1554 &trace_print_event, 1555 &trace_hwlat_event, 1556 &trace_osnoise_event, 1557 &trace_timerlat_event, 1558 &trace_raw_data_event, 1559 &trace_func_repeats_event, 1560 NULL 1561 }; 1562 1563 __init static int init_events(void) 1564 { 1565 struct trace_event *event; 1566 int i, ret; 1567 1568 for (i = 0; events[i]; i++) { 1569 event = events[i]; 1570 1571 ret = register_trace_event(event); 1572 if (!ret) { 1573 printk(KERN_WARNING "event %d failed to register\n", 1574 event->type); 1575 WARN_ON_ONCE(1); 1576 } 1577 } 1578 1579 return 0; 1580 } 1581 early_initcall(init_events); 1582