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 bh_off; 449 int nmi; 450 451 nmi = entry->flags & TRACE_FLAG_NMI; 452 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 453 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 454 bh_off = entry->flags & TRACE_FLAG_BH_OFF; 455 456 irqs_off = 457 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' : 458 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 459 bh_off ? 'b' : 460 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 461 '.'; 462 463 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 464 TRACE_FLAG_PREEMPT_RESCHED)) { 465 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 466 need_resched = 'N'; 467 break; 468 case TRACE_FLAG_NEED_RESCHED: 469 need_resched = 'n'; 470 break; 471 case TRACE_FLAG_PREEMPT_RESCHED: 472 need_resched = 'p'; 473 break; 474 default: 475 need_resched = '.'; 476 break; 477 } 478 479 hardsoft_irq = 480 (nmi && hardirq) ? 'Z' : 481 nmi ? 'z' : 482 (hardirq && softirq) ? 'H' : 483 hardirq ? 'h' : 484 softirq ? 's' : 485 '.' ; 486 487 trace_seq_printf(s, "%c%c%c", 488 irqs_off, need_resched, hardsoft_irq); 489 490 if (entry->preempt_count & 0xf) 491 trace_seq_printf(s, "%x", entry->preempt_count & 0xf); 492 else 493 trace_seq_putc(s, '.'); 494 495 if (entry->preempt_count & 0xf0) 496 trace_seq_printf(s, "%x", entry->preempt_count >> 4); 497 else 498 trace_seq_putc(s, '.'); 499 500 return !trace_seq_has_overflowed(s); 501 } 502 503 static int 504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 505 { 506 char comm[TASK_COMM_LEN]; 507 508 trace_find_cmdline(entry->pid, comm); 509 510 trace_seq_printf(s, "%8.8s-%-7d %3d", 511 comm, entry->pid, cpu); 512 513 return trace_print_lat_fmt(s, entry); 514 } 515 516 #undef MARK 517 #define MARK(v, s) {.val = v, .sym = s} 518 /* trace overhead mark */ 519 static const struct trace_mark { 520 unsigned long long val; /* unit: nsec */ 521 char sym; 522 } mark[] = { 523 MARK(1000000000ULL , '$'), /* 1 sec */ 524 MARK(100000000ULL , '@'), /* 100 msec */ 525 MARK(10000000ULL , '*'), /* 10 msec */ 526 MARK(1000000ULL , '#'), /* 1000 usecs */ 527 MARK(100000ULL , '!'), /* 100 usecs */ 528 MARK(10000ULL , '+'), /* 10 usecs */ 529 }; 530 #undef MARK 531 532 char trace_find_mark(unsigned long long d) 533 { 534 int i; 535 int size = ARRAY_SIZE(mark); 536 537 for (i = 0; i < size; i++) { 538 if (d > mark[i].val) 539 break; 540 } 541 542 return (i == size) ? ' ' : mark[i].sym; 543 } 544 545 static int 546 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 547 { 548 struct trace_array *tr = iter->tr; 549 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 550 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 551 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start; 552 unsigned long long rel_ts = next_ts - iter->ts; 553 struct trace_seq *s = &iter->seq; 554 555 if (in_ns) { 556 abs_ts = ns2usecs(abs_ts); 557 rel_ts = ns2usecs(rel_ts); 558 } 559 560 if (verbose && in_ns) { 561 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 562 unsigned long abs_msec = (unsigned long)abs_ts; 563 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 564 unsigned long rel_msec = (unsigned long)rel_ts; 565 566 trace_seq_printf( 567 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 568 ns2usecs(iter->ts), 569 abs_msec, abs_usec, 570 rel_msec, rel_usec); 571 572 } else if (verbose && !in_ns) { 573 trace_seq_printf( 574 s, "[%016llx] %lld (+%lld): ", 575 iter->ts, abs_ts, rel_ts); 576 577 } else if (!verbose && in_ns) { 578 trace_seq_printf( 579 s, " %4lldus%c: ", 580 abs_ts, 581 trace_find_mark(rel_ts * NSEC_PER_USEC)); 582 583 } else { /* !verbose && !in_ns */ 584 trace_seq_printf(s, " %4lld: ", abs_ts); 585 } 586 587 return !trace_seq_has_overflowed(s); 588 } 589 590 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter, 591 unsigned long long ts) 592 { 593 unsigned long secs, usec_rem; 594 unsigned long long t; 595 596 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 597 t = ns2usecs(ts); 598 usec_rem = do_div(t, USEC_PER_SEC); 599 secs = (unsigned long)t; 600 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem); 601 } else 602 trace_seq_printf(s, " %12llu", ts); 603 } 604 605 int trace_print_context(struct trace_iterator *iter) 606 { 607 struct trace_array *tr = iter->tr; 608 struct trace_seq *s = &iter->seq; 609 struct trace_entry *entry = iter->ent; 610 char comm[TASK_COMM_LEN]; 611 612 trace_find_cmdline(entry->pid, comm); 613 614 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid); 615 616 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 617 unsigned int tgid = trace_find_tgid(entry->pid); 618 619 if (!tgid) 620 trace_seq_printf(s, "(-------) "); 621 else 622 trace_seq_printf(s, "(%7d) ", tgid); 623 } 624 625 trace_seq_printf(s, "[%03d] ", iter->cpu); 626 627 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 628 trace_print_lat_fmt(s, entry); 629 630 trace_print_time(s, iter, iter->ts); 631 trace_seq_puts(s, ": "); 632 633 return !trace_seq_has_overflowed(s); 634 } 635 636 int trace_print_lat_context(struct trace_iterator *iter) 637 { 638 struct trace_entry *entry, *next_entry; 639 struct trace_array *tr = iter->tr; 640 struct trace_seq *s = &iter->seq; 641 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 642 u64 next_ts; 643 644 next_entry = trace_find_next_entry(iter, NULL, &next_ts); 645 if (!next_entry) 646 next_ts = iter->ts; 647 648 /* trace_find_next_entry() may change iter->ent */ 649 entry = iter->ent; 650 651 if (verbose) { 652 char comm[TASK_COMM_LEN]; 653 654 trace_find_cmdline(entry->pid, comm); 655 656 trace_seq_printf( 657 s, "%16s %7d %3d %d %08x %08lx ", 658 comm, entry->pid, iter->cpu, entry->flags, 659 entry->preempt_count & 0xf, iter->idx); 660 } else { 661 lat_print_generic(s, entry, iter->cpu); 662 } 663 664 lat_print_timestamp(iter, next_ts); 665 666 return !trace_seq_has_overflowed(s); 667 } 668 669 /** 670 * ftrace_find_event - find a registered event 671 * @type: the type of event to look for 672 * 673 * Returns an event of type @type otherwise NULL 674 * Called with trace_event_read_lock() held. 675 */ 676 struct trace_event *ftrace_find_event(int type) 677 { 678 struct trace_event *event; 679 unsigned key; 680 681 key = type & (EVENT_HASHSIZE - 1); 682 683 hlist_for_each_entry(event, &event_hash[key], node) { 684 if (event->type == type) 685 return event; 686 } 687 688 return NULL; 689 } 690 691 static LIST_HEAD(ftrace_event_list); 692 693 static int trace_search_list(struct list_head **list) 694 { 695 struct trace_event *e; 696 int next = __TRACE_LAST_TYPE; 697 698 if (list_empty(&ftrace_event_list)) { 699 *list = &ftrace_event_list; 700 return next; 701 } 702 703 /* 704 * We used up all possible max events, 705 * lets see if somebody freed one. 706 */ 707 list_for_each_entry(e, &ftrace_event_list, list) { 708 if (e->type != next) 709 break; 710 next++; 711 } 712 713 /* Did we used up all 65 thousand events??? */ 714 if (next > TRACE_EVENT_TYPE_MAX) 715 return 0; 716 717 *list = &e->list; 718 return next; 719 } 720 721 void trace_event_read_lock(void) 722 { 723 down_read(&trace_event_sem); 724 } 725 726 void trace_event_read_unlock(void) 727 { 728 up_read(&trace_event_sem); 729 } 730 731 /** 732 * register_trace_event - register output for an event type 733 * @event: the event type to register 734 * 735 * Event types are stored in a hash and this hash is used to 736 * find a way to print an event. If the @event->type is set 737 * then it will use that type, otherwise it will assign a 738 * type to use. 739 * 740 * If you assign your own type, please make sure it is added 741 * to the trace_type enum in trace.h, to avoid collisions 742 * with the dynamic types. 743 * 744 * Returns the event type number or zero on error. 745 */ 746 int register_trace_event(struct trace_event *event) 747 { 748 unsigned key; 749 int ret = 0; 750 751 down_write(&trace_event_sem); 752 753 if (WARN_ON(!event)) 754 goto out; 755 756 if (WARN_ON(!event->funcs)) 757 goto out; 758 759 INIT_LIST_HEAD(&event->list); 760 761 if (!event->type) { 762 struct list_head *list = NULL; 763 764 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 765 766 event->type = trace_search_list(&list); 767 if (!event->type) 768 goto out; 769 770 } else { 771 772 event->type = next_event_type++; 773 list = &ftrace_event_list; 774 } 775 776 if (WARN_ON(ftrace_find_event(event->type))) 777 goto out; 778 779 list_add_tail(&event->list, list); 780 781 } else if (event->type > __TRACE_LAST_TYPE) { 782 printk(KERN_WARNING "Need to add type to trace.h\n"); 783 WARN_ON(1); 784 goto out; 785 } else { 786 /* Is this event already used */ 787 if (ftrace_find_event(event->type)) 788 goto out; 789 } 790 791 if (event->funcs->trace == NULL) 792 event->funcs->trace = trace_nop_print; 793 if (event->funcs->raw == NULL) 794 event->funcs->raw = trace_nop_print; 795 if (event->funcs->hex == NULL) 796 event->funcs->hex = trace_nop_print; 797 if (event->funcs->binary == NULL) 798 event->funcs->binary = trace_nop_print; 799 800 key = event->type & (EVENT_HASHSIZE - 1); 801 802 hlist_add_head(&event->node, &event_hash[key]); 803 804 ret = event->type; 805 out: 806 up_write(&trace_event_sem); 807 808 return ret; 809 } 810 EXPORT_SYMBOL_GPL(register_trace_event); 811 812 /* 813 * Used by module code with the trace_event_sem held for write. 814 */ 815 int __unregister_trace_event(struct trace_event *event) 816 { 817 hlist_del(&event->node); 818 list_del(&event->list); 819 return 0; 820 } 821 822 /** 823 * unregister_trace_event - remove a no longer used event 824 * @event: the event to remove 825 */ 826 int unregister_trace_event(struct trace_event *event) 827 { 828 down_write(&trace_event_sem); 829 __unregister_trace_event(event); 830 up_write(&trace_event_sem); 831 832 return 0; 833 } 834 EXPORT_SYMBOL_GPL(unregister_trace_event); 835 836 /* 837 * Standard events 838 */ 839 840 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 841 struct trace_event *event) 842 { 843 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 844 845 return trace_handle_return(&iter->seq); 846 } 847 848 static void print_fn_trace(struct trace_seq *s, unsigned long ip, 849 unsigned long parent_ip, int flags) 850 { 851 seq_print_ip_sym(s, ip, flags); 852 853 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) { 854 trace_seq_puts(s, " <-"); 855 seq_print_ip_sym(s, parent_ip, flags); 856 } 857 } 858 859 /* TRACE_FN */ 860 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 861 struct trace_event *event) 862 { 863 struct ftrace_entry *field; 864 struct trace_seq *s = &iter->seq; 865 866 trace_assign_type(field, iter->ent); 867 868 print_fn_trace(s, field->ip, field->parent_ip, flags); 869 trace_seq_putc(s, '\n'); 870 871 return trace_handle_return(s); 872 } 873 874 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 875 struct trace_event *event) 876 { 877 struct ftrace_entry *field; 878 879 trace_assign_type(field, iter->ent); 880 881 trace_seq_printf(&iter->seq, "%lx %lx\n", 882 field->ip, 883 field->parent_ip); 884 885 return trace_handle_return(&iter->seq); 886 } 887 888 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 889 struct trace_event *event) 890 { 891 struct ftrace_entry *field; 892 struct trace_seq *s = &iter->seq; 893 894 trace_assign_type(field, iter->ent); 895 896 SEQ_PUT_HEX_FIELD(s, field->ip); 897 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 898 899 return trace_handle_return(s); 900 } 901 902 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 903 struct trace_event *event) 904 { 905 struct ftrace_entry *field; 906 struct trace_seq *s = &iter->seq; 907 908 trace_assign_type(field, iter->ent); 909 910 SEQ_PUT_FIELD(s, field->ip); 911 SEQ_PUT_FIELD(s, field->parent_ip); 912 913 return trace_handle_return(s); 914 } 915 916 static struct trace_event_functions trace_fn_funcs = { 917 .trace = trace_fn_trace, 918 .raw = trace_fn_raw, 919 .hex = trace_fn_hex, 920 .binary = trace_fn_bin, 921 }; 922 923 static struct trace_event trace_fn_event = { 924 .type = TRACE_FN, 925 .funcs = &trace_fn_funcs, 926 }; 927 928 /* TRACE_CTX an TRACE_WAKE */ 929 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 930 char *delim) 931 { 932 struct ctx_switch_entry *field; 933 char comm[TASK_COMM_LEN]; 934 int S, T; 935 936 937 trace_assign_type(field, iter->ent); 938 939 T = task_index_to_char(field->next_state); 940 S = task_index_to_char(field->prev_state); 941 trace_find_cmdline(field->next_pid, comm); 942 trace_seq_printf(&iter->seq, 943 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 944 field->prev_pid, 945 field->prev_prio, 946 S, delim, 947 field->next_cpu, 948 field->next_pid, 949 field->next_prio, 950 T, comm); 951 952 return trace_handle_return(&iter->seq); 953 } 954 955 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 956 struct trace_event *event) 957 { 958 return trace_ctxwake_print(iter, "==>"); 959 } 960 961 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 962 int flags, struct trace_event *event) 963 { 964 return trace_ctxwake_print(iter, " +"); 965 } 966 967 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 968 { 969 struct ctx_switch_entry *field; 970 int T; 971 972 trace_assign_type(field, iter->ent); 973 974 if (!S) 975 S = task_index_to_char(field->prev_state); 976 T = task_index_to_char(field->next_state); 977 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 978 field->prev_pid, 979 field->prev_prio, 980 S, 981 field->next_cpu, 982 field->next_pid, 983 field->next_prio, 984 T); 985 986 return trace_handle_return(&iter->seq); 987 } 988 989 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 990 struct trace_event *event) 991 { 992 return trace_ctxwake_raw(iter, 0); 993 } 994 995 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 996 struct trace_event *event) 997 { 998 return trace_ctxwake_raw(iter, '+'); 999 } 1000 1001 1002 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 1003 { 1004 struct ctx_switch_entry *field; 1005 struct trace_seq *s = &iter->seq; 1006 int T; 1007 1008 trace_assign_type(field, iter->ent); 1009 1010 if (!S) 1011 S = task_index_to_char(field->prev_state); 1012 T = task_index_to_char(field->next_state); 1013 1014 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 1015 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 1016 SEQ_PUT_HEX_FIELD(s, S); 1017 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 1018 SEQ_PUT_HEX_FIELD(s, field->next_pid); 1019 SEQ_PUT_HEX_FIELD(s, field->next_prio); 1020 SEQ_PUT_HEX_FIELD(s, T); 1021 1022 return trace_handle_return(s); 1023 } 1024 1025 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1026 struct trace_event *event) 1027 { 1028 return trace_ctxwake_hex(iter, 0); 1029 } 1030 1031 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1032 struct trace_event *event) 1033 { 1034 return trace_ctxwake_hex(iter, '+'); 1035 } 1036 1037 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1038 int flags, struct trace_event *event) 1039 { 1040 struct ctx_switch_entry *field; 1041 struct trace_seq *s = &iter->seq; 1042 1043 trace_assign_type(field, iter->ent); 1044 1045 SEQ_PUT_FIELD(s, field->prev_pid); 1046 SEQ_PUT_FIELD(s, field->prev_prio); 1047 SEQ_PUT_FIELD(s, field->prev_state); 1048 SEQ_PUT_FIELD(s, field->next_cpu); 1049 SEQ_PUT_FIELD(s, field->next_pid); 1050 SEQ_PUT_FIELD(s, field->next_prio); 1051 SEQ_PUT_FIELD(s, field->next_state); 1052 1053 return trace_handle_return(s); 1054 } 1055 1056 static struct trace_event_functions trace_ctx_funcs = { 1057 .trace = trace_ctx_print, 1058 .raw = trace_ctx_raw, 1059 .hex = trace_ctx_hex, 1060 .binary = trace_ctxwake_bin, 1061 }; 1062 1063 static struct trace_event trace_ctx_event = { 1064 .type = TRACE_CTX, 1065 .funcs = &trace_ctx_funcs, 1066 }; 1067 1068 static struct trace_event_functions trace_wake_funcs = { 1069 .trace = trace_wake_print, 1070 .raw = trace_wake_raw, 1071 .hex = trace_wake_hex, 1072 .binary = trace_ctxwake_bin, 1073 }; 1074 1075 static struct trace_event trace_wake_event = { 1076 .type = TRACE_WAKE, 1077 .funcs = &trace_wake_funcs, 1078 }; 1079 1080 /* TRACE_STACK */ 1081 1082 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1083 int flags, struct trace_event *event) 1084 { 1085 struct stack_entry *field; 1086 struct trace_seq *s = &iter->seq; 1087 unsigned long *p; 1088 unsigned long *end; 1089 1090 trace_assign_type(field, iter->ent); 1091 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1092 1093 trace_seq_puts(s, "<stack trace>\n"); 1094 1095 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1096 1097 if (trace_seq_has_overflowed(s)) 1098 break; 1099 1100 trace_seq_puts(s, " => "); 1101 seq_print_ip_sym(s, *p, flags); 1102 trace_seq_putc(s, '\n'); 1103 } 1104 1105 return trace_handle_return(s); 1106 } 1107 1108 static struct trace_event_functions trace_stack_funcs = { 1109 .trace = trace_stack_print, 1110 }; 1111 1112 static struct trace_event trace_stack_event = { 1113 .type = TRACE_STACK, 1114 .funcs = &trace_stack_funcs, 1115 }; 1116 1117 /* TRACE_USER_STACK */ 1118 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1119 int flags, struct trace_event *event) 1120 { 1121 struct trace_array *tr = iter->tr; 1122 struct userstack_entry *field; 1123 struct trace_seq *s = &iter->seq; 1124 struct mm_struct *mm = NULL; 1125 unsigned int i; 1126 1127 trace_assign_type(field, iter->ent); 1128 1129 trace_seq_puts(s, "<user stack trace>\n"); 1130 1131 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1132 struct task_struct *task; 1133 /* 1134 * we do the lookup on the thread group leader, 1135 * since individual threads might have already quit! 1136 */ 1137 rcu_read_lock(); 1138 task = find_task_by_vpid(field->tgid); 1139 if (task) 1140 mm = get_task_mm(task); 1141 rcu_read_unlock(); 1142 } 1143 1144 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1145 unsigned long ip = field->caller[i]; 1146 1147 if (!ip || trace_seq_has_overflowed(s)) 1148 break; 1149 1150 trace_seq_puts(s, " => "); 1151 seq_print_user_ip(s, mm, ip, flags); 1152 trace_seq_putc(s, '\n'); 1153 } 1154 1155 if (mm) 1156 mmput(mm); 1157 1158 return trace_handle_return(s); 1159 } 1160 1161 static struct trace_event_functions trace_user_stack_funcs = { 1162 .trace = trace_user_stack_print, 1163 }; 1164 1165 static struct trace_event trace_user_stack_event = { 1166 .type = TRACE_USER_STACK, 1167 .funcs = &trace_user_stack_funcs, 1168 }; 1169 1170 /* TRACE_HWLAT */ 1171 static enum print_line_t 1172 trace_hwlat_print(struct trace_iterator *iter, int flags, 1173 struct trace_event *event) 1174 { 1175 struct trace_entry *entry = iter->ent; 1176 struct trace_seq *s = &iter->seq; 1177 struct hwlat_entry *field; 1178 1179 trace_assign_type(field, entry); 1180 1181 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1182 field->seqnum, 1183 field->duration, 1184 field->outer_duration, 1185 (long long)field->timestamp.tv_sec, 1186 field->timestamp.tv_nsec, field->count); 1187 1188 if (field->nmi_count) { 1189 /* 1190 * The generic sched_clock() is not NMI safe, thus 1191 * we only record the count and not the time. 1192 */ 1193 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1194 trace_seq_printf(s, " nmi-total:%llu", 1195 field->nmi_total_ts); 1196 trace_seq_printf(s, " nmi-count:%u", 1197 field->nmi_count); 1198 } 1199 1200 trace_seq_putc(s, '\n'); 1201 1202 return trace_handle_return(s); 1203 } 1204 1205 static enum print_line_t 1206 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1207 struct trace_event *event) 1208 { 1209 struct hwlat_entry *field; 1210 struct trace_seq *s = &iter->seq; 1211 1212 trace_assign_type(field, iter->ent); 1213 1214 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1215 field->duration, 1216 field->outer_duration, 1217 (long long)field->timestamp.tv_sec, 1218 field->timestamp.tv_nsec, 1219 field->seqnum); 1220 1221 return trace_handle_return(s); 1222 } 1223 1224 static struct trace_event_functions trace_hwlat_funcs = { 1225 .trace = trace_hwlat_print, 1226 .raw = trace_hwlat_raw, 1227 }; 1228 1229 static struct trace_event trace_hwlat_event = { 1230 .type = TRACE_HWLAT, 1231 .funcs = &trace_hwlat_funcs, 1232 }; 1233 1234 /* TRACE_OSNOISE */ 1235 static enum print_line_t 1236 trace_osnoise_print(struct trace_iterator *iter, int flags, 1237 struct trace_event *event) 1238 { 1239 struct trace_entry *entry = iter->ent; 1240 struct trace_seq *s = &iter->seq; 1241 struct osnoise_entry *field; 1242 u64 ratio, ratio_dec; 1243 u64 net_runtime; 1244 1245 trace_assign_type(field, entry); 1246 1247 /* 1248 * compute the available % of cpu time. 1249 */ 1250 net_runtime = field->runtime - field->noise; 1251 ratio = net_runtime * 10000000; 1252 do_div(ratio, field->runtime); 1253 ratio_dec = do_div(ratio, 100000); 1254 1255 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu", 1256 field->runtime, 1257 field->noise, 1258 ratio, ratio_dec, 1259 field->max_sample); 1260 1261 trace_seq_printf(s, " %6u", field->hw_count); 1262 trace_seq_printf(s, " %6u", field->nmi_count); 1263 trace_seq_printf(s, " %6u", field->irq_count); 1264 trace_seq_printf(s, " %6u", field->softirq_count); 1265 trace_seq_printf(s, " %6u", field->thread_count); 1266 1267 trace_seq_putc(s, '\n'); 1268 1269 return trace_handle_return(s); 1270 } 1271 1272 static enum print_line_t 1273 trace_osnoise_raw(struct trace_iterator *iter, int flags, 1274 struct trace_event *event) 1275 { 1276 struct osnoise_entry *field; 1277 struct trace_seq *s = &iter->seq; 1278 1279 trace_assign_type(field, iter->ent); 1280 1281 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n", 1282 field->runtime, 1283 field->noise, 1284 field->max_sample, 1285 field->hw_count, 1286 field->nmi_count, 1287 field->irq_count, 1288 field->softirq_count, 1289 field->thread_count); 1290 1291 return trace_handle_return(s); 1292 } 1293 1294 static struct trace_event_functions trace_osnoise_funcs = { 1295 .trace = trace_osnoise_print, 1296 .raw = trace_osnoise_raw, 1297 }; 1298 1299 static struct trace_event trace_osnoise_event = { 1300 .type = TRACE_OSNOISE, 1301 .funcs = &trace_osnoise_funcs, 1302 }; 1303 1304 /* TRACE_TIMERLAT */ 1305 static enum print_line_t 1306 trace_timerlat_print(struct trace_iterator *iter, int flags, 1307 struct trace_event *event) 1308 { 1309 struct trace_entry *entry = iter->ent; 1310 struct trace_seq *s = &iter->seq; 1311 struct timerlat_entry *field; 1312 1313 trace_assign_type(field, entry); 1314 1315 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n", 1316 field->seqnum, 1317 field->context ? "thread" : "irq", 1318 field->timer_latency); 1319 1320 return trace_handle_return(s); 1321 } 1322 1323 static enum print_line_t 1324 trace_timerlat_raw(struct trace_iterator *iter, int flags, 1325 struct trace_event *event) 1326 { 1327 struct timerlat_entry *field; 1328 struct trace_seq *s = &iter->seq; 1329 1330 trace_assign_type(field, iter->ent); 1331 1332 trace_seq_printf(s, "%u %d %llu\n", 1333 field->seqnum, 1334 field->context, 1335 field->timer_latency); 1336 1337 return trace_handle_return(s); 1338 } 1339 1340 static struct trace_event_functions trace_timerlat_funcs = { 1341 .trace = trace_timerlat_print, 1342 .raw = trace_timerlat_raw, 1343 }; 1344 1345 static struct trace_event trace_timerlat_event = { 1346 .type = TRACE_TIMERLAT, 1347 .funcs = &trace_timerlat_funcs, 1348 }; 1349 1350 /* TRACE_BPUTS */ 1351 static enum print_line_t 1352 trace_bputs_print(struct trace_iterator *iter, int flags, 1353 struct trace_event *event) 1354 { 1355 struct trace_entry *entry = iter->ent; 1356 struct trace_seq *s = &iter->seq; 1357 struct bputs_entry *field; 1358 1359 trace_assign_type(field, entry); 1360 1361 seq_print_ip_sym(s, field->ip, flags); 1362 trace_seq_puts(s, ": "); 1363 trace_seq_puts(s, field->str); 1364 1365 return trace_handle_return(s); 1366 } 1367 1368 1369 static enum print_line_t 1370 trace_bputs_raw(struct trace_iterator *iter, int flags, 1371 struct trace_event *event) 1372 { 1373 struct bputs_entry *field; 1374 struct trace_seq *s = &iter->seq; 1375 1376 trace_assign_type(field, iter->ent); 1377 1378 trace_seq_printf(s, ": %lx : ", field->ip); 1379 trace_seq_puts(s, field->str); 1380 1381 return trace_handle_return(s); 1382 } 1383 1384 static struct trace_event_functions trace_bputs_funcs = { 1385 .trace = trace_bputs_print, 1386 .raw = trace_bputs_raw, 1387 }; 1388 1389 static struct trace_event trace_bputs_event = { 1390 .type = TRACE_BPUTS, 1391 .funcs = &trace_bputs_funcs, 1392 }; 1393 1394 /* TRACE_BPRINT */ 1395 static enum print_line_t 1396 trace_bprint_print(struct trace_iterator *iter, int flags, 1397 struct trace_event *event) 1398 { 1399 struct trace_entry *entry = iter->ent; 1400 struct trace_seq *s = &iter->seq; 1401 struct bprint_entry *field; 1402 1403 trace_assign_type(field, entry); 1404 1405 seq_print_ip_sym(s, field->ip, flags); 1406 trace_seq_puts(s, ": "); 1407 trace_seq_bprintf(s, field->fmt, field->buf); 1408 1409 return trace_handle_return(s); 1410 } 1411 1412 1413 static enum print_line_t 1414 trace_bprint_raw(struct trace_iterator *iter, int flags, 1415 struct trace_event *event) 1416 { 1417 struct bprint_entry *field; 1418 struct trace_seq *s = &iter->seq; 1419 1420 trace_assign_type(field, iter->ent); 1421 1422 trace_seq_printf(s, ": %lx : ", field->ip); 1423 trace_seq_bprintf(s, field->fmt, field->buf); 1424 1425 return trace_handle_return(s); 1426 } 1427 1428 static struct trace_event_functions trace_bprint_funcs = { 1429 .trace = trace_bprint_print, 1430 .raw = trace_bprint_raw, 1431 }; 1432 1433 static struct trace_event trace_bprint_event = { 1434 .type = TRACE_BPRINT, 1435 .funcs = &trace_bprint_funcs, 1436 }; 1437 1438 /* TRACE_PRINT */ 1439 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1440 int flags, struct trace_event *event) 1441 { 1442 struct print_entry *field; 1443 struct trace_seq *s = &iter->seq; 1444 1445 trace_assign_type(field, iter->ent); 1446 1447 seq_print_ip_sym(s, field->ip, flags); 1448 trace_seq_printf(s, ": %s", field->buf); 1449 1450 return trace_handle_return(s); 1451 } 1452 1453 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1454 struct trace_event *event) 1455 { 1456 struct print_entry *field; 1457 1458 trace_assign_type(field, iter->ent); 1459 1460 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1461 1462 return trace_handle_return(&iter->seq); 1463 } 1464 1465 static struct trace_event_functions trace_print_funcs = { 1466 .trace = trace_print_print, 1467 .raw = trace_print_raw, 1468 }; 1469 1470 static struct trace_event trace_print_event = { 1471 .type = TRACE_PRINT, 1472 .funcs = &trace_print_funcs, 1473 }; 1474 1475 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1476 struct trace_event *event) 1477 { 1478 struct raw_data_entry *field; 1479 int i; 1480 1481 trace_assign_type(field, iter->ent); 1482 1483 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1484 1485 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1486 trace_seq_printf(&iter->seq, " %02x", 1487 (unsigned char)field->buf[i]); 1488 1489 trace_seq_putc(&iter->seq, '\n'); 1490 1491 return trace_handle_return(&iter->seq); 1492 } 1493 1494 static struct trace_event_functions trace_raw_data_funcs = { 1495 .trace = trace_raw_data, 1496 .raw = trace_raw_data, 1497 }; 1498 1499 static struct trace_event trace_raw_data_event = { 1500 .type = TRACE_RAW_DATA, 1501 .funcs = &trace_raw_data_funcs, 1502 }; 1503 1504 static enum print_line_t 1505 trace_func_repeats_raw(struct trace_iterator *iter, int flags, 1506 struct trace_event *event) 1507 { 1508 struct func_repeats_entry *field; 1509 struct trace_seq *s = &iter->seq; 1510 1511 trace_assign_type(field, iter->ent); 1512 1513 trace_seq_printf(s, "%lu %lu %u %llu\n", 1514 field->ip, 1515 field->parent_ip, 1516 field->count, 1517 FUNC_REPEATS_GET_DELTA_TS(field)); 1518 1519 return trace_handle_return(s); 1520 } 1521 1522 static enum print_line_t 1523 trace_func_repeats_print(struct trace_iterator *iter, int flags, 1524 struct trace_event *event) 1525 { 1526 struct func_repeats_entry *field; 1527 struct trace_seq *s = &iter->seq; 1528 1529 trace_assign_type(field, iter->ent); 1530 1531 print_fn_trace(s, field->ip, field->parent_ip, flags); 1532 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count); 1533 trace_print_time(s, iter, 1534 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field)); 1535 trace_seq_puts(s, ")\n"); 1536 1537 return trace_handle_return(s); 1538 } 1539 1540 static struct trace_event_functions trace_func_repeats_funcs = { 1541 .trace = trace_func_repeats_print, 1542 .raw = trace_func_repeats_raw, 1543 }; 1544 1545 static struct trace_event trace_func_repeats_event = { 1546 .type = TRACE_FUNC_REPEATS, 1547 .funcs = &trace_func_repeats_funcs, 1548 }; 1549 1550 static struct trace_event *events[] __initdata = { 1551 &trace_fn_event, 1552 &trace_ctx_event, 1553 &trace_wake_event, 1554 &trace_stack_event, 1555 &trace_user_stack_event, 1556 &trace_bputs_event, 1557 &trace_bprint_event, 1558 &trace_print_event, 1559 &trace_hwlat_event, 1560 &trace_osnoise_event, 1561 &trace_timerlat_event, 1562 &trace_raw_data_event, 1563 &trace_func_repeats_event, 1564 NULL 1565 }; 1566 1567 __init static int init_events(void) 1568 { 1569 struct trace_event *event; 1570 int i, ret; 1571 1572 for (i = 0; events[i]; i++) { 1573 event = events[i]; 1574 1575 ret = register_trace_event(event); 1576 if (!ret) { 1577 printk(KERN_WARNING "event %d failed to register\n", 1578 event->type); 1579 WARN_ON_ONCE(1); 1580 } 1581 } 1582 1583 return 0; 1584 } 1585 early_initcall(init_events); 1586