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 = NULL, *iter; 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(iter, &ftrace_event_list, list) { 708 if (iter->type != next) { 709 e = iter; 710 break; 711 } 712 next++; 713 } 714 715 /* Did we used up all 65 thousand events??? */ 716 if (next > TRACE_EVENT_TYPE_MAX) 717 return 0; 718 719 if (e) 720 *list = &e->list; 721 else 722 *list = &ftrace_event_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 (WARN(event->type > __TRACE_LAST_TYPE, 787 "Need to add type to trace.h")) { 788 goto out; 789 } else { 790 /* Is this event already used */ 791 if (ftrace_find_event(event->type)) 792 goto out; 793 } 794 795 if (event->funcs->trace == NULL) 796 event->funcs->trace = trace_nop_print; 797 if (event->funcs->raw == NULL) 798 event->funcs->raw = trace_nop_print; 799 if (event->funcs->hex == NULL) 800 event->funcs->hex = trace_nop_print; 801 if (event->funcs->binary == NULL) 802 event->funcs->binary = trace_nop_print; 803 804 key = event->type & (EVENT_HASHSIZE - 1); 805 806 hlist_add_head(&event->node, &event_hash[key]); 807 808 ret = event->type; 809 out: 810 up_write(&trace_event_sem); 811 812 return ret; 813 } 814 EXPORT_SYMBOL_GPL(register_trace_event); 815 816 /* 817 * Used by module code with the trace_event_sem held for write. 818 */ 819 int __unregister_trace_event(struct trace_event *event) 820 { 821 hlist_del(&event->node); 822 list_del(&event->list); 823 return 0; 824 } 825 826 /** 827 * unregister_trace_event - remove a no longer used event 828 * @event: the event to remove 829 */ 830 int unregister_trace_event(struct trace_event *event) 831 { 832 down_write(&trace_event_sem); 833 __unregister_trace_event(event); 834 up_write(&trace_event_sem); 835 836 return 0; 837 } 838 EXPORT_SYMBOL_GPL(unregister_trace_event); 839 840 /* 841 * Standard events 842 */ 843 844 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 845 struct trace_event *event) 846 { 847 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 848 849 return trace_handle_return(&iter->seq); 850 } 851 852 static void print_fn_trace(struct trace_seq *s, unsigned long ip, 853 unsigned long parent_ip, int flags) 854 { 855 seq_print_ip_sym(s, ip, flags); 856 857 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) { 858 trace_seq_puts(s, " <-"); 859 seq_print_ip_sym(s, parent_ip, flags); 860 } 861 } 862 863 /* TRACE_FN */ 864 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 865 struct trace_event *event) 866 { 867 struct ftrace_entry *field; 868 struct trace_seq *s = &iter->seq; 869 870 trace_assign_type(field, iter->ent); 871 872 print_fn_trace(s, field->ip, field->parent_ip, flags); 873 trace_seq_putc(s, '\n'); 874 875 return trace_handle_return(s); 876 } 877 878 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 879 struct trace_event *event) 880 { 881 struct ftrace_entry *field; 882 883 trace_assign_type(field, iter->ent); 884 885 trace_seq_printf(&iter->seq, "%lx %lx\n", 886 field->ip, 887 field->parent_ip); 888 889 return trace_handle_return(&iter->seq); 890 } 891 892 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 893 struct trace_event *event) 894 { 895 struct ftrace_entry *field; 896 struct trace_seq *s = &iter->seq; 897 898 trace_assign_type(field, iter->ent); 899 900 SEQ_PUT_HEX_FIELD(s, field->ip); 901 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 902 903 return trace_handle_return(s); 904 } 905 906 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 907 struct trace_event *event) 908 { 909 struct ftrace_entry *field; 910 struct trace_seq *s = &iter->seq; 911 912 trace_assign_type(field, iter->ent); 913 914 SEQ_PUT_FIELD(s, field->ip); 915 SEQ_PUT_FIELD(s, field->parent_ip); 916 917 return trace_handle_return(s); 918 } 919 920 static struct trace_event_functions trace_fn_funcs = { 921 .trace = trace_fn_trace, 922 .raw = trace_fn_raw, 923 .hex = trace_fn_hex, 924 .binary = trace_fn_bin, 925 }; 926 927 static struct trace_event trace_fn_event = { 928 .type = TRACE_FN, 929 .funcs = &trace_fn_funcs, 930 }; 931 932 /* TRACE_CTX an TRACE_WAKE */ 933 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 934 char *delim) 935 { 936 struct ctx_switch_entry *field; 937 char comm[TASK_COMM_LEN]; 938 int S, T; 939 940 941 trace_assign_type(field, iter->ent); 942 943 T = task_index_to_char(field->next_state); 944 S = task_index_to_char(field->prev_state); 945 trace_find_cmdline(field->next_pid, comm); 946 trace_seq_printf(&iter->seq, 947 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 948 field->prev_pid, 949 field->prev_prio, 950 S, delim, 951 field->next_cpu, 952 field->next_pid, 953 field->next_prio, 954 T, comm); 955 956 return trace_handle_return(&iter->seq); 957 } 958 959 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 960 struct trace_event *event) 961 { 962 return trace_ctxwake_print(iter, "==>"); 963 } 964 965 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 966 int flags, struct trace_event *event) 967 { 968 return trace_ctxwake_print(iter, " +"); 969 } 970 971 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 972 { 973 struct ctx_switch_entry *field; 974 int T; 975 976 trace_assign_type(field, iter->ent); 977 978 if (!S) 979 S = task_index_to_char(field->prev_state); 980 T = task_index_to_char(field->next_state); 981 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 982 field->prev_pid, 983 field->prev_prio, 984 S, 985 field->next_cpu, 986 field->next_pid, 987 field->next_prio, 988 T); 989 990 return trace_handle_return(&iter->seq); 991 } 992 993 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 994 struct trace_event *event) 995 { 996 return trace_ctxwake_raw(iter, 0); 997 } 998 999 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 1000 struct trace_event *event) 1001 { 1002 return trace_ctxwake_raw(iter, '+'); 1003 } 1004 1005 1006 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 1007 { 1008 struct ctx_switch_entry *field; 1009 struct trace_seq *s = &iter->seq; 1010 int T; 1011 1012 trace_assign_type(field, iter->ent); 1013 1014 if (!S) 1015 S = task_index_to_char(field->prev_state); 1016 T = task_index_to_char(field->next_state); 1017 1018 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 1019 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 1020 SEQ_PUT_HEX_FIELD(s, S); 1021 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 1022 SEQ_PUT_HEX_FIELD(s, field->next_pid); 1023 SEQ_PUT_HEX_FIELD(s, field->next_prio); 1024 SEQ_PUT_HEX_FIELD(s, T); 1025 1026 return trace_handle_return(s); 1027 } 1028 1029 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 1030 struct trace_event *event) 1031 { 1032 return trace_ctxwake_hex(iter, 0); 1033 } 1034 1035 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1036 struct trace_event *event) 1037 { 1038 return trace_ctxwake_hex(iter, '+'); 1039 } 1040 1041 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1042 int flags, struct trace_event *event) 1043 { 1044 struct ctx_switch_entry *field; 1045 struct trace_seq *s = &iter->seq; 1046 1047 trace_assign_type(field, iter->ent); 1048 1049 SEQ_PUT_FIELD(s, field->prev_pid); 1050 SEQ_PUT_FIELD(s, field->prev_prio); 1051 SEQ_PUT_FIELD(s, field->prev_state); 1052 SEQ_PUT_FIELD(s, field->next_cpu); 1053 SEQ_PUT_FIELD(s, field->next_pid); 1054 SEQ_PUT_FIELD(s, field->next_prio); 1055 SEQ_PUT_FIELD(s, field->next_state); 1056 1057 return trace_handle_return(s); 1058 } 1059 1060 static struct trace_event_functions trace_ctx_funcs = { 1061 .trace = trace_ctx_print, 1062 .raw = trace_ctx_raw, 1063 .hex = trace_ctx_hex, 1064 .binary = trace_ctxwake_bin, 1065 }; 1066 1067 static struct trace_event trace_ctx_event = { 1068 .type = TRACE_CTX, 1069 .funcs = &trace_ctx_funcs, 1070 }; 1071 1072 static struct trace_event_functions trace_wake_funcs = { 1073 .trace = trace_wake_print, 1074 .raw = trace_wake_raw, 1075 .hex = trace_wake_hex, 1076 .binary = trace_ctxwake_bin, 1077 }; 1078 1079 static struct trace_event trace_wake_event = { 1080 .type = TRACE_WAKE, 1081 .funcs = &trace_wake_funcs, 1082 }; 1083 1084 /* TRACE_STACK */ 1085 1086 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1087 int flags, struct trace_event *event) 1088 { 1089 struct stack_entry *field; 1090 struct trace_seq *s = &iter->seq; 1091 unsigned long *p; 1092 unsigned long *end; 1093 1094 trace_assign_type(field, iter->ent); 1095 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1096 1097 trace_seq_puts(s, "<stack trace>\n"); 1098 1099 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1100 1101 if (trace_seq_has_overflowed(s)) 1102 break; 1103 1104 trace_seq_puts(s, " => "); 1105 seq_print_ip_sym(s, *p, flags); 1106 trace_seq_putc(s, '\n'); 1107 } 1108 1109 return trace_handle_return(s); 1110 } 1111 1112 static struct trace_event_functions trace_stack_funcs = { 1113 .trace = trace_stack_print, 1114 }; 1115 1116 static struct trace_event trace_stack_event = { 1117 .type = TRACE_STACK, 1118 .funcs = &trace_stack_funcs, 1119 }; 1120 1121 /* TRACE_USER_STACK */ 1122 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1123 int flags, struct trace_event *event) 1124 { 1125 struct trace_array *tr = iter->tr; 1126 struct userstack_entry *field; 1127 struct trace_seq *s = &iter->seq; 1128 struct mm_struct *mm = NULL; 1129 unsigned int i; 1130 1131 trace_assign_type(field, iter->ent); 1132 1133 trace_seq_puts(s, "<user stack trace>\n"); 1134 1135 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1136 struct task_struct *task; 1137 /* 1138 * we do the lookup on the thread group leader, 1139 * since individual threads might have already quit! 1140 */ 1141 rcu_read_lock(); 1142 task = find_task_by_vpid(field->tgid); 1143 if (task) 1144 mm = get_task_mm(task); 1145 rcu_read_unlock(); 1146 } 1147 1148 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1149 unsigned long ip = field->caller[i]; 1150 1151 if (!ip || trace_seq_has_overflowed(s)) 1152 break; 1153 1154 trace_seq_puts(s, " => "); 1155 seq_print_user_ip(s, mm, ip, flags); 1156 trace_seq_putc(s, '\n'); 1157 } 1158 1159 if (mm) 1160 mmput(mm); 1161 1162 return trace_handle_return(s); 1163 } 1164 1165 static struct trace_event_functions trace_user_stack_funcs = { 1166 .trace = trace_user_stack_print, 1167 }; 1168 1169 static struct trace_event trace_user_stack_event = { 1170 .type = TRACE_USER_STACK, 1171 .funcs = &trace_user_stack_funcs, 1172 }; 1173 1174 /* TRACE_HWLAT */ 1175 static enum print_line_t 1176 trace_hwlat_print(struct trace_iterator *iter, int flags, 1177 struct trace_event *event) 1178 { 1179 struct trace_entry *entry = iter->ent; 1180 struct trace_seq *s = &iter->seq; 1181 struct hwlat_entry *field; 1182 1183 trace_assign_type(field, entry); 1184 1185 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1186 field->seqnum, 1187 field->duration, 1188 field->outer_duration, 1189 (long long)field->timestamp.tv_sec, 1190 field->timestamp.tv_nsec, field->count); 1191 1192 if (field->nmi_count) { 1193 /* 1194 * The generic sched_clock() is not NMI safe, thus 1195 * we only record the count and not the time. 1196 */ 1197 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1198 trace_seq_printf(s, " nmi-total:%llu", 1199 field->nmi_total_ts); 1200 trace_seq_printf(s, " nmi-count:%u", 1201 field->nmi_count); 1202 } 1203 1204 trace_seq_putc(s, '\n'); 1205 1206 return trace_handle_return(s); 1207 } 1208 1209 static enum print_line_t 1210 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1211 struct trace_event *event) 1212 { 1213 struct hwlat_entry *field; 1214 struct trace_seq *s = &iter->seq; 1215 1216 trace_assign_type(field, iter->ent); 1217 1218 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1219 field->duration, 1220 field->outer_duration, 1221 (long long)field->timestamp.tv_sec, 1222 field->timestamp.tv_nsec, 1223 field->seqnum); 1224 1225 return trace_handle_return(s); 1226 } 1227 1228 static struct trace_event_functions trace_hwlat_funcs = { 1229 .trace = trace_hwlat_print, 1230 .raw = trace_hwlat_raw, 1231 }; 1232 1233 static struct trace_event trace_hwlat_event = { 1234 .type = TRACE_HWLAT, 1235 .funcs = &trace_hwlat_funcs, 1236 }; 1237 1238 /* TRACE_OSNOISE */ 1239 static enum print_line_t 1240 trace_osnoise_print(struct trace_iterator *iter, int flags, 1241 struct trace_event *event) 1242 { 1243 struct trace_entry *entry = iter->ent; 1244 struct trace_seq *s = &iter->seq; 1245 struct osnoise_entry *field; 1246 u64 ratio, ratio_dec; 1247 u64 net_runtime; 1248 1249 trace_assign_type(field, entry); 1250 1251 /* 1252 * compute the available % of cpu time. 1253 */ 1254 net_runtime = field->runtime - field->noise; 1255 ratio = net_runtime * 10000000; 1256 do_div(ratio, field->runtime); 1257 ratio_dec = do_div(ratio, 100000); 1258 1259 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu", 1260 field->runtime, 1261 field->noise, 1262 ratio, ratio_dec, 1263 field->max_sample); 1264 1265 trace_seq_printf(s, " %6u", field->hw_count); 1266 trace_seq_printf(s, " %6u", field->nmi_count); 1267 trace_seq_printf(s, " %6u", field->irq_count); 1268 trace_seq_printf(s, " %6u", field->softirq_count); 1269 trace_seq_printf(s, " %6u", field->thread_count); 1270 1271 trace_seq_putc(s, '\n'); 1272 1273 return trace_handle_return(s); 1274 } 1275 1276 static enum print_line_t 1277 trace_osnoise_raw(struct trace_iterator *iter, int flags, 1278 struct trace_event *event) 1279 { 1280 struct osnoise_entry *field; 1281 struct trace_seq *s = &iter->seq; 1282 1283 trace_assign_type(field, iter->ent); 1284 1285 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n", 1286 field->runtime, 1287 field->noise, 1288 field->max_sample, 1289 field->hw_count, 1290 field->nmi_count, 1291 field->irq_count, 1292 field->softirq_count, 1293 field->thread_count); 1294 1295 return trace_handle_return(s); 1296 } 1297 1298 static struct trace_event_functions trace_osnoise_funcs = { 1299 .trace = trace_osnoise_print, 1300 .raw = trace_osnoise_raw, 1301 }; 1302 1303 static struct trace_event trace_osnoise_event = { 1304 .type = TRACE_OSNOISE, 1305 .funcs = &trace_osnoise_funcs, 1306 }; 1307 1308 /* TRACE_TIMERLAT */ 1309 static enum print_line_t 1310 trace_timerlat_print(struct trace_iterator *iter, int flags, 1311 struct trace_event *event) 1312 { 1313 struct trace_entry *entry = iter->ent; 1314 struct trace_seq *s = &iter->seq; 1315 struct timerlat_entry *field; 1316 1317 trace_assign_type(field, entry); 1318 1319 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n", 1320 field->seqnum, 1321 field->context ? "thread" : "irq", 1322 field->timer_latency); 1323 1324 return trace_handle_return(s); 1325 } 1326 1327 static enum print_line_t 1328 trace_timerlat_raw(struct trace_iterator *iter, int flags, 1329 struct trace_event *event) 1330 { 1331 struct timerlat_entry *field; 1332 struct trace_seq *s = &iter->seq; 1333 1334 trace_assign_type(field, iter->ent); 1335 1336 trace_seq_printf(s, "%u %d %llu\n", 1337 field->seqnum, 1338 field->context, 1339 field->timer_latency); 1340 1341 return trace_handle_return(s); 1342 } 1343 1344 static struct trace_event_functions trace_timerlat_funcs = { 1345 .trace = trace_timerlat_print, 1346 .raw = trace_timerlat_raw, 1347 }; 1348 1349 static struct trace_event trace_timerlat_event = { 1350 .type = TRACE_TIMERLAT, 1351 .funcs = &trace_timerlat_funcs, 1352 }; 1353 1354 /* TRACE_BPUTS */ 1355 static enum print_line_t 1356 trace_bputs_print(struct trace_iterator *iter, int flags, 1357 struct trace_event *event) 1358 { 1359 struct trace_entry *entry = iter->ent; 1360 struct trace_seq *s = &iter->seq; 1361 struct bputs_entry *field; 1362 1363 trace_assign_type(field, entry); 1364 1365 seq_print_ip_sym(s, field->ip, flags); 1366 trace_seq_puts(s, ": "); 1367 trace_seq_puts(s, field->str); 1368 1369 return trace_handle_return(s); 1370 } 1371 1372 1373 static enum print_line_t 1374 trace_bputs_raw(struct trace_iterator *iter, int flags, 1375 struct trace_event *event) 1376 { 1377 struct bputs_entry *field; 1378 struct trace_seq *s = &iter->seq; 1379 1380 trace_assign_type(field, iter->ent); 1381 1382 trace_seq_printf(s, ": %lx : ", field->ip); 1383 trace_seq_puts(s, field->str); 1384 1385 return trace_handle_return(s); 1386 } 1387 1388 static struct trace_event_functions trace_bputs_funcs = { 1389 .trace = trace_bputs_print, 1390 .raw = trace_bputs_raw, 1391 }; 1392 1393 static struct trace_event trace_bputs_event = { 1394 .type = TRACE_BPUTS, 1395 .funcs = &trace_bputs_funcs, 1396 }; 1397 1398 /* TRACE_BPRINT */ 1399 static enum print_line_t 1400 trace_bprint_print(struct trace_iterator *iter, int flags, 1401 struct trace_event *event) 1402 { 1403 struct trace_entry *entry = iter->ent; 1404 struct trace_seq *s = &iter->seq; 1405 struct bprint_entry *field; 1406 1407 trace_assign_type(field, entry); 1408 1409 seq_print_ip_sym(s, field->ip, flags); 1410 trace_seq_puts(s, ": "); 1411 trace_seq_bprintf(s, field->fmt, field->buf); 1412 1413 return trace_handle_return(s); 1414 } 1415 1416 1417 static enum print_line_t 1418 trace_bprint_raw(struct trace_iterator *iter, int flags, 1419 struct trace_event *event) 1420 { 1421 struct bprint_entry *field; 1422 struct trace_seq *s = &iter->seq; 1423 1424 trace_assign_type(field, iter->ent); 1425 1426 trace_seq_printf(s, ": %lx : ", field->ip); 1427 trace_seq_bprintf(s, field->fmt, field->buf); 1428 1429 return trace_handle_return(s); 1430 } 1431 1432 static struct trace_event_functions trace_bprint_funcs = { 1433 .trace = trace_bprint_print, 1434 .raw = trace_bprint_raw, 1435 }; 1436 1437 static struct trace_event trace_bprint_event = { 1438 .type = TRACE_BPRINT, 1439 .funcs = &trace_bprint_funcs, 1440 }; 1441 1442 /* TRACE_PRINT */ 1443 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1444 int flags, struct trace_event *event) 1445 { 1446 struct print_entry *field; 1447 struct trace_seq *s = &iter->seq; 1448 1449 trace_assign_type(field, iter->ent); 1450 1451 seq_print_ip_sym(s, field->ip, flags); 1452 trace_seq_printf(s, ": %s", field->buf); 1453 1454 return trace_handle_return(s); 1455 } 1456 1457 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1458 struct trace_event *event) 1459 { 1460 struct print_entry *field; 1461 1462 trace_assign_type(field, iter->ent); 1463 1464 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1465 1466 return trace_handle_return(&iter->seq); 1467 } 1468 1469 static struct trace_event_functions trace_print_funcs = { 1470 .trace = trace_print_print, 1471 .raw = trace_print_raw, 1472 }; 1473 1474 static struct trace_event trace_print_event = { 1475 .type = TRACE_PRINT, 1476 .funcs = &trace_print_funcs, 1477 }; 1478 1479 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1480 struct trace_event *event) 1481 { 1482 struct raw_data_entry *field; 1483 int i; 1484 1485 trace_assign_type(field, iter->ent); 1486 1487 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1488 1489 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1490 trace_seq_printf(&iter->seq, " %02x", 1491 (unsigned char)field->buf[i]); 1492 1493 trace_seq_putc(&iter->seq, '\n'); 1494 1495 return trace_handle_return(&iter->seq); 1496 } 1497 1498 static struct trace_event_functions trace_raw_data_funcs = { 1499 .trace = trace_raw_data, 1500 .raw = trace_raw_data, 1501 }; 1502 1503 static struct trace_event trace_raw_data_event = { 1504 .type = TRACE_RAW_DATA, 1505 .funcs = &trace_raw_data_funcs, 1506 }; 1507 1508 static enum print_line_t 1509 trace_func_repeats_raw(struct trace_iterator *iter, int flags, 1510 struct trace_event *event) 1511 { 1512 struct func_repeats_entry *field; 1513 struct trace_seq *s = &iter->seq; 1514 1515 trace_assign_type(field, iter->ent); 1516 1517 trace_seq_printf(s, "%lu %lu %u %llu\n", 1518 field->ip, 1519 field->parent_ip, 1520 field->count, 1521 FUNC_REPEATS_GET_DELTA_TS(field)); 1522 1523 return trace_handle_return(s); 1524 } 1525 1526 static enum print_line_t 1527 trace_func_repeats_print(struct trace_iterator *iter, int flags, 1528 struct trace_event *event) 1529 { 1530 struct func_repeats_entry *field; 1531 struct trace_seq *s = &iter->seq; 1532 1533 trace_assign_type(field, iter->ent); 1534 1535 print_fn_trace(s, field->ip, field->parent_ip, flags); 1536 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count); 1537 trace_print_time(s, iter, 1538 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field)); 1539 trace_seq_puts(s, ")\n"); 1540 1541 return trace_handle_return(s); 1542 } 1543 1544 static struct trace_event_functions trace_func_repeats_funcs = { 1545 .trace = trace_func_repeats_print, 1546 .raw = trace_func_repeats_raw, 1547 }; 1548 1549 static struct trace_event trace_func_repeats_event = { 1550 .type = TRACE_FUNC_REPEATS, 1551 .funcs = &trace_func_repeats_funcs, 1552 }; 1553 1554 static struct trace_event *events[] __initdata = { 1555 &trace_fn_event, 1556 &trace_ctx_event, 1557 &trace_wake_event, 1558 &trace_stack_event, 1559 &trace_user_stack_event, 1560 &trace_bputs_event, 1561 &trace_bprint_event, 1562 &trace_print_event, 1563 &trace_hwlat_event, 1564 &trace_osnoise_event, 1565 &trace_timerlat_event, 1566 &trace_raw_data_event, 1567 &trace_func_repeats_event, 1568 NULL 1569 }; 1570 1571 __init static int init_events(void) 1572 { 1573 struct trace_event *event; 1574 int i, ret; 1575 1576 for (i = 0; events[i]; i++) { 1577 event = events[i]; 1578 ret = register_trace_event(event); 1579 WARN_ONCE(!ret, "event %d failed to register", event->type); 1580 } 1581 1582 return 0; 1583 } 1584 early_initcall(init_events); 1585