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; 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 const char *fmt = concatenate ? "%*phN" : "%*ph"; 223 224 for (i = 0; i < buf_len; i += 16) 225 trace_seq_printf(p, fmt, min(buf_len - i, 16), &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 const char * 278 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str, 279 int prefix_type, int rowsize, int groupsize, 280 const void *buf, size_t len, bool ascii) 281 { 282 const char *ret = trace_seq_buffer_ptr(p); 283 284 trace_seq_putc(p, '\n'); 285 trace_seq_hex_dump(p, prefix_str, prefix_type, 286 rowsize, groupsize, buf, len, ascii); 287 trace_seq_putc(p, 0); 288 return ret; 289 } 290 EXPORT_SYMBOL(trace_print_hex_dump_seq); 291 292 int trace_raw_output_prep(struct trace_iterator *iter, 293 struct trace_event *trace_event) 294 { 295 struct trace_event_call *event; 296 struct trace_seq *s = &iter->seq; 297 struct trace_seq *p = &iter->tmp_seq; 298 struct trace_entry *entry; 299 300 event = container_of(trace_event, struct trace_event_call, event); 301 entry = iter->ent; 302 303 if (entry->type != event->event.type) { 304 WARN_ON_ONCE(1); 305 return TRACE_TYPE_UNHANDLED; 306 } 307 308 trace_seq_init(p); 309 trace_seq_printf(s, "%s: ", trace_event_name(event)); 310 311 return trace_handle_return(s); 312 } 313 EXPORT_SYMBOL(trace_raw_output_prep); 314 315 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...) 316 { 317 va_list ap; 318 319 va_start(ap, fmt); 320 trace_check_vprintf(iter, trace_event_format(iter, fmt), ap); 321 va_end(ap); 322 } 323 EXPORT_SYMBOL(trace_event_printf); 324 325 static int trace_output_raw(struct trace_iterator *iter, char *name, 326 char *fmt, va_list ap) 327 { 328 struct trace_seq *s = &iter->seq; 329 330 trace_seq_printf(s, "%s: ", name); 331 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap); 332 333 return trace_handle_return(s); 334 } 335 336 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) 337 { 338 va_list ap; 339 int ret; 340 341 va_start(ap, fmt); 342 ret = trace_output_raw(iter, name, fmt, ap); 343 va_end(ap); 344 345 return ret; 346 } 347 EXPORT_SYMBOL_GPL(trace_output_call); 348 349 #ifdef CONFIG_KRETPROBES 350 static inline const char *kretprobed(const char *name) 351 { 352 static const char tramp_name[] = "kretprobe_trampoline"; 353 int size = sizeof(tramp_name); 354 355 if (strncmp(tramp_name, name, size) == 0) 356 return "[unknown/kretprobe'd]"; 357 return name; 358 } 359 #else 360 static inline const char *kretprobed(const char *name) 361 { 362 return name; 363 } 364 #endif /* CONFIG_KRETPROBES */ 365 366 void 367 trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) 368 { 369 #ifdef CONFIG_KALLSYMS 370 char str[KSYM_SYMBOL_LEN]; 371 const char *name; 372 373 if (offset) 374 sprint_symbol(str, address); 375 else 376 kallsyms_lookup(address, NULL, NULL, NULL, str); 377 name = kretprobed(str); 378 379 if (name && strlen(name)) { 380 trace_seq_puts(s, name); 381 return; 382 } 383 #endif 384 trace_seq_printf(s, "0x%08lx", address); 385 } 386 387 #ifndef CONFIG_64BIT 388 # define IP_FMT "%08lx" 389 #else 390 # define IP_FMT "%016lx" 391 #endif 392 393 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, 394 unsigned long ip, unsigned long sym_flags) 395 { 396 struct file *file = NULL; 397 unsigned long vmstart = 0; 398 int ret = 1; 399 400 if (s->full) 401 return 0; 402 403 if (mm) { 404 const struct vm_area_struct *vma; 405 406 mmap_read_lock(mm); 407 vma = find_vma(mm, ip); 408 if (vma) { 409 file = vma->vm_file; 410 vmstart = vma->vm_start; 411 } 412 if (file) { 413 ret = trace_seq_path(s, &file->f_path); 414 if (ret) 415 trace_seq_printf(s, "[+0x%lx]", 416 ip - vmstart); 417 } 418 mmap_read_unlock(mm); 419 } 420 if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) 421 trace_seq_printf(s, " <" IP_FMT ">", ip); 422 return !trace_seq_has_overflowed(s); 423 } 424 425 int 426 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) 427 { 428 if (!ip) { 429 trace_seq_putc(s, '0'); 430 goto out; 431 } 432 433 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET); 434 435 if (sym_flags & TRACE_ITER_SYM_ADDR) 436 trace_seq_printf(s, " <" IP_FMT ">", ip); 437 438 out: 439 return !trace_seq_has_overflowed(s); 440 } 441 442 /** 443 * trace_print_lat_fmt - print the irq, preempt and lockdep fields 444 * @s: trace seq struct to write to 445 * @entry: The trace entry field from the ring buffer 446 * 447 * Prints the generic fields of irqs off, in hard or softirq, preempt 448 * count. 449 */ 450 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry) 451 { 452 char hardsoft_irq; 453 char need_resched; 454 char irqs_off; 455 int hardirq; 456 int softirq; 457 int nmi; 458 459 nmi = entry->flags & TRACE_FLAG_NMI; 460 hardirq = entry->flags & TRACE_FLAG_HARDIRQ; 461 softirq = entry->flags & TRACE_FLAG_SOFTIRQ; 462 463 irqs_off = 464 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' : 465 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : 466 '.'; 467 468 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | 469 TRACE_FLAG_PREEMPT_RESCHED)) { 470 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED: 471 need_resched = 'N'; 472 break; 473 case TRACE_FLAG_NEED_RESCHED: 474 need_resched = 'n'; 475 break; 476 case TRACE_FLAG_PREEMPT_RESCHED: 477 need_resched = 'p'; 478 break; 479 default: 480 need_resched = '.'; 481 break; 482 } 483 484 hardsoft_irq = 485 (nmi && hardirq) ? 'Z' : 486 nmi ? 'z' : 487 (hardirq && softirq) ? 'H' : 488 hardirq ? 'h' : 489 softirq ? 's' : 490 '.' ; 491 492 trace_seq_printf(s, "%c%c%c", 493 irqs_off, need_resched, hardsoft_irq); 494 495 if (entry->preempt_count & 0xf) 496 trace_seq_printf(s, "%x", entry->preempt_count & 0xf); 497 else 498 trace_seq_putc(s, '.'); 499 500 if (entry->preempt_count & 0xf0) 501 trace_seq_printf(s, "%x", entry->preempt_count >> 4); 502 else 503 trace_seq_putc(s, '.'); 504 505 return !trace_seq_has_overflowed(s); 506 } 507 508 static int 509 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu) 510 { 511 char comm[TASK_COMM_LEN]; 512 513 trace_find_cmdline(entry->pid, comm); 514 515 trace_seq_printf(s, "%8.8s-%-7d %3d", 516 comm, entry->pid, cpu); 517 518 return trace_print_lat_fmt(s, entry); 519 } 520 521 #undef MARK 522 #define MARK(v, s) {.val = v, .sym = s} 523 /* trace overhead mark */ 524 static const struct trace_mark { 525 unsigned long long val; /* unit: nsec */ 526 char sym; 527 } mark[] = { 528 MARK(1000000000ULL , '$'), /* 1 sec */ 529 MARK(100000000ULL , '@'), /* 100 msec */ 530 MARK(10000000ULL , '*'), /* 10 msec */ 531 MARK(1000000ULL , '#'), /* 1000 usecs */ 532 MARK(100000ULL , '!'), /* 100 usecs */ 533 MARK(10000ULL , '+'), /* 10 usecs */ 534 }; 535 #undef MARK 536 537 char trace_find_mark(unsigned long long d) 538 { 539 int i; 540 int size = ARRAY_SIZE(mark); 541 542 for (i = 0; i < size; i++) { 543 if (d > mark[i].val) 544 break; 545 } 546 547 return (i == size) ? ' ' : mark[i].sym; 548 } 549 550 static int 551 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts) 552 { 553 struct trace_array *tr = iter->tr; 554 unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE; 555 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS; 556 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start; 557 unsigned long long rel_ts = next_ts - iter->ts; 558 struct trace_seq *s = &iter->seq; 559 560 if (in_ns) { 561 abs_ts = ns2usecs(abs_ts); 562 rel_ts = ns2usecs(rel_ts); 563 } 564 565 if (verbose && in_ns) { 566 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC); 567 unsigned long abs_msec = (unsigned long)abs_ts; 568 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC); 569 unsigned long rel_msec = (unsigned long)rel_ts; 570 571 trace_seq_printf( 572 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ", 573 ns2usecs(iter->ts), 574 abs_msec, abs_usec, 575 rel_msec, rel_usec); 576 577 } else if (verbose && !in_ns) { 578 trace_seq_printf( 579 s, "[%016llx] %lld (+%lld): ", 580 iter->ts, abs_ts, rel_ts); 581 582 } else if (!verbose && in_ns) { 583 trace_seq_printf( 584 s, " %4lldus%c: ", 585 abs_ts, 586 trace_find_mark(rel_ts * NSEC_PER_USEC)); 587 588 } else { /* !verbose && !in_ns */ 589 trace_seq_printf(s, " %4lld: ", abs_ts); 590 } 591 592 return !trace_seq_has_overflowed(s); 593 } 594 595 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter, 596 unsigned long long ts) 597 { 598 unsigned long secs, usec_rem; 599 unsigned long long t; 600 601 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) { 602 t = ns2usecs(ts); 603 usec_rem = do_div(t, USEC_PER_SEC); 604 secs = (unsigned long)t; 605 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem); 606 } else 607 trace_seq_printf(s, " %12llu", ts); 608 } 609 610 int trace_print_context(struct trace_iterator *iter) 611 { 612 struct trace_array *tr = iter->tr; 613 struct trace_seq *s = &iter->seq; 614 struct trace_entry *entry = iter->ent; 615 char comm[TASK_COMM_LEN]; 616 617 trace_find_cmdline(entry->pid, comm); 618 619 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid); 620 621 if (tr->trace_flags & TRACE_ITER_RECORD_TGID) { 622 unsigned int tgid = trace_find_tgid(entry->pid); 623 624 if (!tgid) 625 trace_seq_printf(s, "(-------) "); 626 else 627 trace_seq_printf(s, "(%7d) ", tgid); 628 } 629 630 trace_seq_printf(s, "[%03d] ", iter->cpu); 631 632 if (tr->trace_flags & TRACE_ITER_IRQ_INFO) 633 trace_print_lat_fmt(s, entry); 634 635 trace_print_time(s, iter, iter->ts); 636 trace_seq_puts(s, ": "); 637 638 return !trace_seq_has_overflowed(s); 639 } 640 641 int trace_print_lat_context(struct trace_iterator *iter) 642 { 643 struct trace_entry *entry, *next_entry; 644 struct trace_array *tr = iter->tr; 645 struct trace_seq *s = &iter->seq; 646 unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE); 647 u64 next_ts; 648 649 next_entry = trace_find_next_entry(iter, NULL, &next_ts); 650 if (!next_entry) 651 next_ts = iter->ts; 652 653 /* trace_find_next_entry() may change iter->ent */ 654 entry = iter->ent; 655 656 if (verbose) { 657 char comm[TASK_COMM_LEN]; 658 659 trace_find_cmdline(entry->pid, comm); 660 661 trace_seq_printf( 662 s, "%16s %7d %3d %d %08x %08lx ", 663 comm, entry->pid, iter->cpu, entry->flags, 664 entry->preempt_count & 0xf, iter->idx); 665 } else { 666 lat_print_generic(s, entry, iter->cpu); 667 } 668 669 lat_print_timestamp(iter, next_ts); 670 671 return !trace_seq_has_overflowed(s); 672 } 673 674 /** 675 * ftrace_find_event - find a registered event 676 * @type: the type of event to look for 677 * 678 * Returns an event of type @type otherwise NULL 679 * Called with trace_event_read_lock() held. 680 */ 681 struct trace_event *ftrace_find_event(int type) 682 { 683 struct trace_event *event; 684 unsigned key; 685 686 key = type & (EVENT_HASHSIZE - 1); 687 688 hlist_for_each_entry(event, &event_hash[key], node) { 689 if (event->type == type) 690 return event; 691 } 692 693 return NULL; 694 } 695 696 static LIST_HEAD(ftrace_event_list); 697 698 static int trace_search_list(struct list_head **list) 699 { 700 struct trace_event *e; 701 int next = __TRACE_LAST_TYPE; 702 703 if (list_empty(&ftrace_event_list)) { 704 *list = &ftrace_event_list; 705 return next; 706 } 707 708 /* 709 * We used up all possible max events, 710 * lets see if somebody freed one. 711 */ 712 list_for_each_entry(e, &ftrace_event_list, list) { 713 if (e->type != next) 714 break; 715 next++; 716 } 717 718 /* Did we used up all 65 thousand events??? */ 719 if (next > TRACE_EVENT_TYPE_MAX) 720 return 0; 721 722 *list = &e->list; 723 return next; 724 } 725 726 void trace_event_read_lock(void) 727 { 728 down_read(&trace_event_sem); 729 } 730 731 void trace_event_read_unlock(void) 732 { 733 up_read(&trace_event_sem); 734 } 735 736 /** 737 * register_trace_event - register output for an event type 738 * @event: the event type to register 739 * 740 * Event types are stored in a hash and this hash is used to 741 * find a way to print an event. If the @event->type is set 742 * then it will use that type, otherwise it will assign a 743 * type to use. 744 * 745 * If you assign your own type, please make sure it is added 746 * to the trace_type enum in trace.h, to avoid collisions 747 * with the dynamic types. 748 * 749 * Returns the event type number or zero on error. 750 */ 751 int register_trace_event(struct trace_event *event) 752 { 753 unsigned key; 754 int ret = 0; 755 756 down_write(&trace_event_sem); 757 758 if (WARN_ON(!event)) 759 goto out; 760 761 if (WARN_ON(!event->funcs)) 762 goto out; 763 764 INIT_LIST_HEAD(&event->list); 765 766 if (!event->type) { 767 struct list_head *list = NULL; 768 769 if (next_event_type > TRACE_EVENT_TYPE_MAX) { 770 771 event->type = trace_search_list(&list); 772 if (!event->type) 773 goto out; 774 775 } else { 776 777 event->type = next_event_type++; 778 list = &ftrace_event_list; 779 } 780 781 if (WARN_ON(ftrace_find_event(event->type))) 782 goto out; 783 784 list_add_tail(&event->list, list); 785 786 } else if (event->type > __TRACE_LAST_TYPE) { 787 printk(KERN_WARNING "Need to add type to trace.h\n"); 788 WARN_ON(1); 789 goto out; 790 } else { 791 /* Is this event already used */ 792 if (ftrace_find_event(event->type)) 793 goto out; 794 } 795 796 if (event->funcs->trace == NULL) 797 event->funcs->trace = trace_nop_print; 798 if (event->funcs->raw == NULL) 799 event->funcs->raw = trace_nop_print; 800 if (event->funcs->hex == NULL) 801 event->funcs->hex = trace_nop_print; 802 if (event->funcs->binary == NULL) 803 event->funcs->binary = trace_nop_print; 804 805 key = event->type & (EVENT_HASHSIZE - 1); 806 807 hlist_add_head(&event->node, &event_hash[key]); 808 809 ret = event->type; 810 out: 811 up_write(&trace_event_sem); 812 813 return ret; 814 } 815 EXPORT_SYMBOL_GPL(register_trace_event); 816 817 /* 818 * Used by module code with the trace_event_sem held for write. 819 */ 820 int __unregister_trace_event(struct trace_event *event) 821 { 822 hlist_del(&event->node); 823 list_del(&event->list); 824 return 0; 825 } 826 827 /** 828 * unregister_trace_event - remove a no longer used event 829 * @event: the event to remove 830 */ 831 int unregister_trace_event(struct trace_event *event) 832 { 833 down_write(&trace_event_sem); 834 __unregister_trace_event(event); 835 up_write(&trace_event_sem); 836 837 return 0; 838 } 839 EXPORT_SYMBOL_GPL(unregister_trace_event); 840 841 /* 842 * Standard events 843 */ 844 845 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 846 struct trace_event *event) 847 { 848 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 849 850 return trace_handle_return(&iter->seq); 851 } 852 853 static void print_fn_trace(struct trace_seq *s, unsigned long ip, 854 unsigned long parent_ip, int flags) 855 { 856 seq_print_ip_sym(s, ip, flags); 857 858 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) { 859 trace_seq_puts(s, " <-"); 860 seq_print_ip_sym(s, parent_ip, flags); 861 } 862 } 863 864 /* TRACE_FN */ 865 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 866 struct trace_event *event) 867 { 868 struct ftrace_entry *field; 869 struct trace_seq *s = &iter->seq; 870 871 trace_assign_type(field, iter->ent); 872 873 print_fn_trace(s, field->ip, field->parent_ip, flags); 874 trace_seq_putc(s, '\n'); 875 876 return trace_handle_return(s); 877 } 878 879 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 880 struct trace_event *event) 881 { 882 struct ftrace_entry *field; 883 884 trace_assign_type(field, iter->ent); 885 886 trace_seq_printf(&iter->seq, "%lx %lx\n", 887 field->ip, 888 field->parent_ip); 889 890 return trace_handle_return(&iter->seq); 891 } 892 893 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 894 struct trace_event *event) 895 { 896 struct ftrace_entry *field; 897 struct trace_seq *s = &iter->seq; 898 899 trace_assign_type(field, iter->ent); 900 901 SEQ_PUT_HEX_FIELD(s, field->ip); 902 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 903 904 return trace_handle_return(s); 905 } 906 907 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 908 struct trace_event *event) 909 { 910 struct ftrace_entry *field; 911 struct trace_seq *s = &iter->seq; 912 913 trace_assign_type(field, iter->ent); 914 915 SEQ_PUT_FIELD(s, field->ip); 916 SEQ_PUT_FIELD(s, field->parent_ip); 917 918 return trace_handle_return(s); 919 } 920 921 static struct trace_event_functions trace_fn_funcs = { 922 .trace = trace_fn_trace, 923 .raw = trace_fn_raw, 924 .hex = trace_fn_hex, 925 .binary = trace_fn_bin, 926 }; 927 928 static struct trace_event trace_fn_event = { 929 .type = TRACE_FN, 930 .funcs = &trace_fn_funcs, 931 }; 932 933 /* TRACE_CTX an TRACE_WAKE */ 934 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 935 char *delim) 936 { 937 struct ctx_switch_entry *field; 938 char comm[TASK_COMM_LEN]; 939 int S, T; 940 941 942 trace_assign_type(field, iter->ent); 943 944 T = task_index_to_char(field->next_state); 945 S = task_index_to_char(field->prev_state); 946 trace_find_cmdline(field->next_pid, comm); 947 trace_seq_printf(&iter->seq, 948 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 949 field->prev_pid, 950 field->prev_prio, 951 S, delim, 952 field->next_cpu, 953 field->next_pid, 954 field->next_prio, 955 T, comm); 956 957 return trace_handle_return(&iter->seq); 958 } 959 960 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 961 struct trace_event *event) 962 { 963 return trace_ctxwake_print(iter, "==>"); 964 } 965 966 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 967 int flags, struct trace_event *event) 968 { 969 return trace_ctxwake_print(iter, " +"); 970 } 971 972 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 973 { 974 struct ctx_switch_entry *field; 975 int T; 976 977 trace_assign_type(field, iter->ent); 978 979 if (!S) 980 S = task_index_to_char(field->prev_state); 981 T = task_index_to_char(field->next_state); 982 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 983 field->prev_pid, 984 field->prev_prio, 985 S, 986 field->next_cpu, 987 field->next_pid, 988 field->next_prio, 989 T); 990 991 return trace_handle_return(&iter->seq); 992 } 993 994 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 995 struct trace_event *event) 996 { 997 return trace_ctxwake_raw(iter, 0); 998 } 999 1000 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 1001 struct trace_event *event) 1002 { 1003 return trace_ctxwake_raw(iter, '+'); 1004 } 1005 1006 1007 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 1008 { 1009 struct ctx_switch_entry *field; 1010 struct trace_seq *s = &iter->seq; 1011 int T; 1012 1013 trace_assign_type(field, iter->ent); 1014 1015 if (!S) 1016 S = task_index_to_char(field->prev_state); 1017 T = task_index_to_char(field->next_state); 1018 1019 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 1020 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 1021 SEQ_PUT_HEX_FIELD(s, S); 1022 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 1023 SEQ_PUT_HEX_FIELD(s, field->next_pid); 1024 SEQ_PUT_HEX_FIELD(s, field->next_prio); 1025 SEQ_PUT_HEX_FIELD(s, T); 1026 1027 return trace_handle_return(s); 1028 } 1029 1030 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1031 struct trace_event *event) 1032 { 1033 return trace_ctxwake_hex(iter, 0); 1034 } 1035 1036 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1037 struct trace_event *event) 1038 { 1039 return trace_ctxwake_hex(iter, '+'); 1040 } 1041 1042 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1043 int flags, struct trace_event *event) 1044 { 1045 struct ctx_switch_entry *field; 1046 struct trace_seq *s = &iter->seq; 1047 1048 trace_assign_type(field, iter->ent); 1049 1050 SEQ_PUT_FIELD(s, field->prev_pid); 1051 SEQ_PUT_FIELD(s, field->prev_prio); 1052 SEQ_PUT_FIELD(s, field->prev_state); 1053 SEQ_PUT_FIELD(s, field->next_cpu); 1054 SEQ_PUT_FIELD(s, field->next_pid); 1055 SEQ_PUT_FIELD(s, field->next_prio); 1056 SEQ_PUT_FIELD(s, field->next_state); 1057 1058 return trace_handle_return(s); 1059 } 1060 1061 static struct trace_event_functions trace_ctx_funcs = { 1062 .trace = trace_ctx_print, 1063 .raw = trace_ctx_raw, 1064 .hex = trace_ctx_hex, 1065 .binary = trace_ctxwake_bin, 1066 }; 1067 1068 static struct trace_event trace_ctx_event = { 1069 .type = TRACE_CTX, 1070 .funcs = &trace_ctx_funcs, 1071 }; 1072 1073 static struct trace_event_functions trace_wake_funcs = { 1074 .trace = trace_wake_print, 1075 .raw = trace_wake_raw, 1076 .hex = trace_wake_hex, 1077 .binary = trace_ctxwake_bin, 1078 }; 1079 1080 static struct trace_event trace_wake_event = { 1081 .type = TRACE_WAKE, 1082 .funcs = &trace_wake_funcs, 1083 }; 1084 1085 /* TRACE_STACK */ 1086 1087 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1088 int flags, struct trace_event *event) 1089 { 1090 struct stack_entry *field; 1091 struct trace_seq *s = &iter->seq; 1092 unsigned long *p; 1093 unsigned long *end; 1094 1095 trace_assign_type(field, iter->ent); 1096 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1097 1098 trace_seq_puts(s, "<stack trace>\n"); 1099 1100 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1101 1102 if (trace_seq_has_overflowed(s)) 1103 break; 1104 1105 trace_seq_puts(s, " => "); 1106 seq_print_ip_sym(s, *p, flags); 1107 trace_seq_putc(s, '\n'); 1108 } 1109 1110 return trace_handle_return(s); 1111 } 1112 1113 static struct trace_event_functions trace_stack_funcs = { 1114 .trace = trace_stack_print, 1115 }; 1116 1117 static struct trace_event trace_stack_event = { 1118 .type = TRACE_STACK, 1119 .funcs = &trace_stack_funcs, 1120 }; 1121 1122 /* TRACE_USER_STACK */ 1123 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1124 int flags, struct trace_event *event) 1125 { 1126 struct trace_array *tr = iter->tr; 1127 struct userstack_entry *field; 1128 struct trace_seq *s = &iter->seq; 1129 struct mm_struct *mm = NULL; 1130 unsigned int i; 1131 1132 trace_assign_type(field, iter->ent); 1133 1134 trace_seq_puts(s, "<user stack trace>\n"); 1135 1136 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1137 struct task_struct *task; 1138 /* 1139 * we do the lookup on the thread group leader, 1140 * since individual threads might have already quit! 1141 */ 1142 rcu_read_lock(); 1143 task = find_task_by_vpid(field->tgid); 1144 if (task) 1145 mm = get_task_mm(task); 1146 rcu_read_unlock(); 1147 } 1148 1149 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1150 unsigned long ip = field->caller[i]; 1151 1152 if (!ip || trace_seq_has_overflowed(s)) 1153 break; 1154 1155 trace_seq_puts(s, " => "); 1156 seq_print_user_ip(s, mm, ip, flags); 1157 trace_seq_putc(s, '\n'); 1158 } 1159 1160 if (mm) 1161 mmput(mm); 1162 1163 return trace_handle_return(s); 1164 } 1165 1166 static struct trace_event_functions trace_user_stack_funcs = { 1167 .trace = trace_user_stack_print, 1168 }; 1169 1170 static struct trace_event trace_user_stack_event = { 1171 .type = TRACE_USER_STACK, 1172 .funcs = &trace_user_stack_funcs, 1173 }; 1174 1175 /* TRACE_HWLAT */ 1176 static enum print_line_t 1177 trace_hwlat_print(struct trace_iterator *iter, int flags, 1178 struct trace_event *event) 1179 { 1180 struct trace_entry *entry = iter->ent; 1181 struct trace_seq *s = &iter->seq; 1182 struct hwlat_entry *field; 1183 1184 trace_assign_type(field, entry); 1185 1186 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1187 field->seqnum, 1188 field->duration, 1189 field->outer_duration, 1190 (long long)field->timestamp.tv_sec, 1191 field->timestamp.tv_nsec, field->count); 1192 1193 if (field->nmi_count) { 1194 /* 1195 * The generic sched_clock() is not NMI safe, thus 1196 * we only record the count and not the time. 1197 */ 1198 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1199 trace_seq_printf(s, " nmi-total:%llu", 1200 field->nmi_total_ts); 1201 trace_seq_printf(s, " nmi-count:%u", 1202 field->nmi_count); 1203 } 1204 1205 trace_seq_putc(s, '\n'); 1206 1207 return trace_handle_return(s); 1208 } 1209 1210 static enum print_line_t 1211 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1212 struct trace_event *event) 1213 { 1214 struct hwlat_entry *field; 1215 struct trace_seq *s = &iter->seq; 1216 1217 trace_assign_type(field, iter->ent); 1218 1219 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1220 field->duration, 1221 field->outer_duration, 1222 (long long)field->timestamp.tv_sec, 1223 field->timestamp.tv_nsec, 1224 field->seqnum); 1225 1226 return trace_handle_return(s); 1227 } 1228 1229 static struct trace_event_functions trace_hwlat_funcs = { 1230 .trace = trace_hwlat_print, 1231 .raw = trace_hwlat_raw, 1232 }; 1233 1234 static struct trace_event trace_hwlat_event = { 1235 .type = TRACE_HWLAT, 1236 .funcs = &trace_hwlat_funcs, 1237 }; 1238 1239 /* TRACE_OSNOISE */ 1240 static enum print_line_t 1241 trace_osnoise_print(struct trace_iterator *iter, int flags, 1242 struct trace_event *event) 1243 { 1244 struct trace_entry *entry = iter->ent; 1245 struct trace_seq *s = &iter->seq; 1246 struct osnoise_entry *field; 1247 u64 ratio, ratio_dec; 1248 u64 net_runtime; 1249 1250 trace_assign_type(field, entry); 1251 1252 /* 1253 * compute the available % of cpu time. 1254 */ 1255 net_runtime = field->runtime - field->noise; 1256 ratio = net_runtime * 10000000; 1257 do_div(ratio, field->runtime); 1258 ratio_dec = do_div(ratio, 100000); 1259 1260 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu", 1261 field->runtime, 1262 field->noise, 1263 ratio, ratio_dec, 1264 field->max_sample); 1265 1266 trace_seq_printf(s, " %6u", field->hw_count); 1267 trace_seq_printf(s, " %6u", field->nmi_count); 1268 trace_seq_printf(s, " %6u", field->irq_count); 1269 trace_seq_printf(s, " %6u", field->softirq_count); 1270 trace_seq_printf(s, " %6u", field->thread_count); 1271 1272 trace_seq_putc(s, '\n'); 1273 1274 return trace_handle_return(s); 1275 } 1276 1277 static enum print_line_t 1278 trace_osnoise_raw(struct trace_iterator *iter, int flags, 1279 struct trace_event *event) 1280 { 1281 struct osnoise_entry *field; 1282 struct trace_seq *s = &iter->seq; 1283 1284 trace_assign_type(field, iter->ent); 1285 1286 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n", 1287 field->runtime, 1288 field->noise, 1289 field->max_sample, 1290 field->hw_count, 1291 field->nmi_count, 1292 field->irq_count, 1293 field->softirq_count, 1294 field->thread_count); 1295 1296 return trace_handle_return(s); 1297 } 1298 1299 static struct trace_event_functions trace_osnoise_funcs = { 1300 .trace = trace_osnoise_print, 1301 .raw = trace_osnoise_raw, 1302 }; 1303 1304 static struct trace_event trace_osnoise_event = { 1305 .type = TRACE_OSNOISE, 1306 .funcs = &trace_osnoise_funcs, 1307 }; 1308 1309 /* TRACE_TIMERLAT */ 1310 static enum print_line_t 1311 trace_timerlat_print(struct trace_iterator *iter, int flags, 1312 struct trace_event *event) 1313 { 1314 struct trace_entry *entry = iter->ent; 1315 struct trace_seq *s = &iter->seq; 1316 struct timerlat_entry *field; 1317 1318 trace_assign_type(field, entry); 1319 1320 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n", 1321 field->seqnum, 1322 field->context ? "thread" : "irq", 1323 field->timer_latency); 1324 1325 return trace_handle_return(s); 1326 } 1327 1328 static enum print_line_t 1329 trace_timerlat_raw(struct trace_iterator *iter, int flags, 1330 struct trace_event *event) 1331 { 1332 struct timerlat_entry *field; 1333 struct trace_seq *s = &iter->seq; 1334 1335 trace_assign_type(field, iter->ent); 1336 1337 trace_seq_printf(s, "%u %d %llu\n", 1338 field->seqnum, 1339 field->context, 1340 field->timer_latency); 1341 1342 return trace_handle_return(s); 1343 } 1344 1345 static struct trace_event_functions trace_timerlat_funcs = { 1346 .trace = trace_timerlat_print, 1347 .raw = trace_timerlat_raw, 1348 }; 1349 1350 static struct trace_event trace_timerlat_event = { 1351 .type = TRACE_TIMERLAT, 1352 .funcs = &trace_timerlat_funcs, 1353 }; 1354 1355 /* TRACE_BPUTS */ 1356 static enum print_line_t 1357 trace_bputs_print(struct trace_iterator *iter, int flags, 1358 struct trace_event *event) 1359 { 1360 struct trace_entry *entry = iter->ent; 1361 struct trace_seq *s = &iter->seq; 1362 struct bputs_entry *field; 1363 1364 trace_assign_type(field, entry); 1365 1366 seq_print_ip_sym(s, field->ip, flags); 1367 trace_seq_puts(s, ": "); 1368 trace_seq_puts(s, field->str); 1369 1370 return trace_handle_return(s); 1371 } 1372 1373 1374 static enum print_line_t 1375 trace_bputs_raw(struct trace_iterator *iter, int flags, 1376 struct trace_event *event) 1377 { 1378 struct bputs_entry *field; 1379 struct trace_seq *s = &iter->seq; 1380 1381 trace_assign_type(field, iter->ent); 1382 1383 trace_seq_printf(s, ": %lx : ", field->ip); 1384 trace_seq_puts(s, field->str); 1385 1386 return trace_handle_return(s); 1387 } 1388 1389 static struct trace_event_functions trace_bputs_funcs = { 1390 .trace = trace_bputs_print, 1391 .raw = trace_bputs_raw, 1392 }; 1393 1394 static struct trace_event trace_bputs_event = { 1395 .type = TRACE_BPUTS, 1396 .funcs = &trace_bputs_funcs, 1397 }; 1398 1399 /* TRACE_BPRINT */ 1400 static enum print_line_t 1401 trace_bprint_print(struct trace_iterator *iter, int flags, 1402 struct trace_event *event) 1403 { 1404 struct trace_entry *entry = iter->ent; 1405 struct trace_seq *s = &iter->seq; 1406 struct bprint_entry *field; 1407 1408 trace_assign_type(field, entry); 1409 1410 seq_print_ip_sym(s, field->ip, flags); 1411 trace_seq_puts(s, ": "); 1412 trace_seq_bprintf(s, field->fmt, field->buf); 1413 1414 return trace_handle_return(s); 1415 } 1416 1417 1418 static enum print_line_t 1419 trace_bprint_raw(struct trace_iterator *iter, int flags, 1420 struct trace_event *event) 1421 { 1422 struct bprint_entry *field; 1423 struct trace_seq *s = &iter->seq; 1424 1425 trace_assign_type(field, iter->ent); 1426 1427 trace_seq_printf(s, ": %lx : ", field->ip); 1428 trace_seq_bprintf(s, field->fmt, field->buf); 1429 1430 return trace_handle_return(s); 1431 } 1432 1433 static struct trace_event_functions trace_bprint_funcs = { 1434 .trace = trace_bprint_print, 1435 .raw = trace_bprint_raw, 1436 }; 1437 1438 static struct trace_event trace_bprint_event = { 1439 .type = TRACE_BPRINT, 1440 .funcs = &trace_bprint_funcs, 1441 }; 1442 1443 /* TRACE_PRINT */ 1444 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1445 int flags, struct trace_event *event) 1446 { 1447 struct print_entry *field; 1448 struct trace_seq *s = &iter->seq; 1449 1450 trace_assign_type(field, iter->ent); 1451 1452 seq_print_ip_sym(s, field->ip, flags); 1453 trace_seq_printf(s, ": %s", field->buf); 1454 1455 return trace_handle_return(s); 1456 } 1457 1458 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1459 struct trace_event *event) 1460 { 1461 struct print_entry *field; 1462 1463 trace_assign_type(field, iter->ent); 1464 1465 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1466 1467 return trace_handle_return(&iter->seq); 1468 } 1469 1470 static struct trace_event_functions trace_print_funcs = { 1471 .trace = trace_print_print, 1472 .raw = trace_print_raw, 1473 }; 1474 1475 static struct trace_event trace_print_event = { 1476 .type = TRACE_PRINT, 1477 .funcs = &trace_print_funcs, 1478 }; 1479 1480 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1481 struct trace_event *event) 1482 { 1483 struct raw_data_entry *field; 1484 int i; 1485 1486 trace_assign_type(field, iter->ent); 1487 1488 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1489 1490 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1491 trace_seq_printf(&iter->seq, " %02x", 1492 (unsigned char)field->buf[i]); 1493 1494 trace_seq_putc(&iter->seq, '\n'); 1495 1496 return trace_handle_return(&iter->seq); 1497 } 1498 1499 static struct trace_event_functions trace_raw_data_funcs = { 1500 .trace = trace_raw_data, 1501 .raw = trace_raw_data, 1502 }; 1503 1504 static struct trace_event trace_raw_data_event = { 1505 .type = TRACE_RAW_DATA, 1506 .funcs = &trace_raw_data_funcs, 1507 }; 1508 1509 static enum print_line_t 1510 trace_func_repeats_raw(struct trace_iterator *iter, int flags, 1511 struct trace_event *event) 1512 { 1513 struct func_repeats_entry *field; 1514 struct trace_seq *s = &iter->seq; 1515 1516 trace_assign_type(field, iter->ent); 1517 1518 trace_seq_printf(s, "%lu %lu %u %llu\n", 1519 field->ip, 1520 field->parent_ip, 1521 field->count, 1522 FUNC_REPEATS_GET_DELTA_TS(field)); 1523 1524 return trace_handle_return(s); 1525 } 1526 1527 static enum print_line_t 1528 trace_func_repeats_print(struct trace_iterator *iter, int flags, 1529 struct trace_event *event) 1530 { 1531 struct func_repeats_entry *field; 1532 struct trace_seq *s = &iter->seq; 1533 1534 trace_assign_type(field, iter->ent); 1535 1536 print_fn_trace(s, field->ip, field->parent_ip, flags); 1537 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count); 1538 trace_print_time(s, iter, 1539 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field)); 1540 trace_seq_puts(s, ")\n"); 1541 1542 return trace_handle_return(s); 1543 } 1544 1545 static struct trace_event_functions trace_func_repeats_funcs = { 1546 .trace = trace_func_repeats_print, 1547 .raw = trace_func_repeats_raw, 1548 }; 1549 1550 static struct trace_event trace_func_repeats_event = { 1551 .type = TRACE_FUNC_REPEATS, 1552 .funcs = &trace_func_repeats_funcs, 1553 }; 1554 1555 static struct trace_event *events[] __initdata = { 1556 &trace_fn_event, 1557 &trace_ctx_event, 1558 &trace_wake_event, 1559 &trace_stack_event, 1560 &trace_user_stack_event, 1561 &trace_bputs_event, 1562 &trace_bprint_event, 1563 &trace_print_event, 1564 &trace_hwlat_event, 1565 &trace_osnoise_event, 1566 &trace_timerlat_event, 1567 &trace_raw_data_event, 1568 &trace_func_repeats_event, 1569 NULL 1570 }; 1571 1572 __init static int init_events(void) 1573 { 1574 struct trace_event *event; 1575 int i, ret; 1576 1577 for (i = 0; events[i]; i++) { 1578 event = events[i]; 1579 1580 ret = register_trace_event(event); 1581 if (!ret) { 1582 printk(KERN_WARNING "event %d failed to register\n", 1583 event->type); 1584 WARN_ON_ONCE(1); 1585 } 1586 } 1587 1588 return 0; 1589 } 1590 early_initcall(init_events); 1591