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 #include <linux/idr.h> 15 16 #include "trace_output.h" 17 18 /* must be a power of 2 */ 19 #define EVENT_HASHSIZE 128 20 21 DECLARE_RWSEM(trace_event_sem); 22 23 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; 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 __printf(3, 0) 326 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 DEFINE_IDA(trace_event_ida); 692 693 static void free_trace_event_type(int type) 694 { 695 if (type >= __TRACE_LAST_TYPE) 696 ida_free(&trace_event_ida, type); 697 } 698 699 static int alloc_trace_event_type(void) 700 { 701 int next; 702 703 /* Skip static defined type numbers */ 704 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE, 705 TRACE_EVENT_TYPE_MAX, GFP_KERNEL); 706 if (next < 0) 707 return 0; 708 return next; 709 } 710 711 void trace_event_read_lock(void) 712 { 713 down_read(&trace_event_sem); 714 } 715 716 void trace_event_read_unlock(void) 717 { 718 up_read(&trace_event_sem); 719 } 720 721 /** 722 * register_trace_event - register output for an event type 723 * @event: the event type to register 724 * 725 * Event types are stored in a hash and this hash is used to 726 * find a way to print an event. If the @event->type is set 727 * then it will use that type, otherwise it will assign a 728 * type to use. 729 * 730 * If you assign your own type, please make sure it is added 731 * to the trace_type enum in trace.h, to avoid collisions 732 * with the dynamic types. 733 * 734 * Returns the event type number or zero on error. 735 */ 736 int register_trace_event(struct trace_event *event) 737 { 738 unsigned key; 739 int ret = 0; 740 741 down_write(&trace_event_sem); 742 743 if (WARN_ON(!event)) 744 goto out; 745 746 if (WARN_ON(!event->funcs)) 747 goto out; 748 749 if (!event->type) { 750 event->type = alloc_trace_event_type(); 751 if (!event->type) 752 goto out; 753 } else if (WARN(event->type > __TRACE_LAST_TYPE, 754 "Need to add type to trace.h")) { 755 goto out; 756 } else { 757 /* Is this event already used */ 758 if (ftrace_find_event(event->type)) 759 goto out; 760 } 761 762 if (event->funcs->trace == NULL) 763 event->funcs->trace = trace_nop_print; 764 if (event->funcs->raw == NULL) 765 event->funcs->raw = trace_nop_print; 766 if (event->funcs->hex == NULL) 767 event->funcs->hex = trace_nop_print; 768 if (event->funcs->binary == NULL) 769 event->funcs->binary = trace_nop_print; 770 771 key = event->type & (EVENT_HASHSIZE - 1); 772 773 hlist_add_head(&event->node, &event_hash[key]); 774 775 ret = event->type; 776 out: 777 up_write(&trace_event_sem); 778 779 return ret; 780 } 781 EXPORT_SYMBOL_GPL(register_trace_event); 782 783 /* 784 * Used by module code with the trace_event_sem held for write. 785 */ 786 int __unregister_trace_event(struct trace_event *event) 787 { 788 hlist_del(&event->node); 789 free_trace_event_type(event->type); 790 return 0; 791 } 792 793 /** 794 * unregister_trace_event - remove a no longer used event 795 * @event: the event to remove 796 */ 797 int unregister_trace_event(struct trace_event *event) 798 { 799 down_write(&trace_event_sem); 800 __unregister_trace_event(event); 801 up_write(&trace_event_sem); 802 803 return 0; 804 } 805 EXPORT_SYMBOL_GPL(unregister_trace_event); 806 807 /* 808 * Standard events 809 */ 810 811 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags, 812 struct trace_event *event) 813 { 814 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type); 815 816 return trace_handle_return(&iter->seq); 817 } 818 819 static void print_fn_trace(struct trace_seq *s, unsigned long ip, 820 unsigned long parent_ip, int flags) 821 { 822 seq_print_ip_sym(s, ip, flags); 823 824 if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) { 825 trace_seq_puts(s, " <-"); 826 seq_print_ip_sym(s, parent_ip, flags); 827 } 828 } 829 830 /* TRACE_FN */ 831 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags, 832 struct trace_event *event) 833 { 834 struct ftrace_entry *field; 835 struct trace_seq *s = &iter->seq; 836 837 trace_assign_type(field, iter->ent); 838 839 print_fn_trace(s, field->ip, field->parent_ip, flags); 840 trace_seq_putc(s, '\n'); 841 842 return trace_handle_return(s); 843 } 844 845 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags, 846 struct trace_event *event) 847 { 848 struct ftrace_entry *field; 849 850 trace_assign_type(field, iter->ent); 851 852 trace_seq_printf(&iter->seq, "%lx %lx\n", 853 field->ip, 854 field->parent_ip); 855 856 return trace_handle_return(&iter->seq); 857 } 858 859 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags, 860 struct trace_event *event) 861 { 862 struct ftrace_entry *field; 863 struct trace_seq *s = &iter->seq; 864 865 trace_assign_type(field, iter->ent); 866 867 SEQ_PUT_HEX_FIELD(s, field->ip); 868 SEQ_PUT_HEX_FIELD(s, field->parent_ip); 869 870 return trace_handle_return(s); 871 } 872 873 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags, 874 struct trace_event *event) 875 { 876 struct ftrace_entry *field; 877 struct trace_seq *s = &iter->seq; 878 879 trace_assign_type(field, iter->ent); 880 881 SEQ_PUT_FIELD(s, field->ip); 882 SEQ_PUT_FIELD(s, field->parent_ip); 883 884 return trace_handle_return(s); 885 } 886 887 static struct trace_event_functions trace_fn_funcs = { 888 .trace = trace_fn_trace, 889 .raw = trace_fn_raw, 890 .hex = trace_fn_hex, 891 .binary = trace_fn_bin, 892 }; 893 894 static struct trace_event trace_fn_event = { 895 .type = TRACE_FN, 896 .funcs = &trace_fn_funcs, 897 }; 898 899 /* TRACE_CTX an TRACE_WAKE */ 900 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter, 901 char *delim) 902 { 903 struct ctx_switch_entry *field; 904 char comm[TASK_COMM_LEN]; 905 int S, T; 906 907 908 trace_assign_type(field, iter->ent); 909 910 T = task_index_to_char(field->next_state); 911 S = task_index_to_char(field->prev_state); 912 trace_find_cmdline(field->next_pid, comm); 913 trace_seq_printf(&iter->seq, 914 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n", 915 field->prev_pid, 916 field->prev_prio, 917 S, delim, 918 field->next_cpu, 919 field->next_pid, 920 field->next_prio, 921 T, comm); 922 923 return trace_handle_return(&iter->seq); 924 } 925 926 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags, 927 struct trace_event *event) 928 { 929 return trace_ctxwake_print(iter, "==>"); 930 } 931 932 static enum print_line_t trace_wake_print(struct trace_iterator *iter, 933 int flags, struct trace_event *event) 934 { 935 return trace_ctxwake_print(iter, " +"); 936 } 937 938 static int trace_ctxwake_raw(struct trace_iterator *iter, char S) 939 { 940 struct ctx_switch_entry *field; 941 int T; 942 943 trace_assign_type(field, iter->ent); 944 945 if (!S) 946 S = task_index_to_char(field->prev_state); 947 T = task_index_to_char(field->next_state); 948 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n", 949 field->prev_pid, 950 field->prev_prio, 951 S, 952 field->next_cpu, 953 field->next_pid, 954 field->next_prio, 955 T); 956 957 return trace_handle_return(&iter->seq); 958 } 959 960 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags, 961 struct trace_event *event) 962 { 963 return trace_ctxwake_raw(iter, 0); 964 } 965 966 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags, 967 struct trace_event *event) 968 { 969 return trace_ctxwake_raw(iter, '+'); 970 } 971 972 973 static int trace_ctxwake_hex(struct trace_iterator *iter, char S) 974 { 975 struct ctx_switch_entry *field; 976 struct trace_seq *s = &iter->seq; 977 int T; 978 979 trace_assign_type(field, iter->ent); 980 981 if (!S) 982 S = task_index_to_char(field->prev_state); 983 T = task_index_to_char(field->next_state); 984 985 SEQ_PUT_HEX_FIELD(s, field->prev_pid); 986 SEQ_PUT_HEX_FIELD(s, field->prev_prio); 987 SEQ_PUT_HEX_FIELD(s, S); 988 SEQ_PUT_HEX_FIELD(s, field->next_cpu); 989 SEQ_PUT_HEX_FIELD(s, field->next_pid); 990 SEQ_PUT_HEX_FIELD(s, field->next_prio); 991 SEQ_PUT_HEX_FIELD(s, T); 992 993 return trace_handle_return(s); 994 } 995 996 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags, 997 struct trace_event *event) 998 { 999 return trace_ctxwake_hex(iter, 0); 1000 } 1001 1002 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags, 1003 struct trace_event *event) 1004 { 1005 return trace_ctxwake_hex(iter, '+'); 1006 } 1007 1008 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter, 1009 int flags, struct trace_event *event) 1010 { 1011 struct ctx_switch_entry *field; 1012 struct trace_seq *s = &iter->seq; 1013 1014 trace_assign_type(field, iter->ent); 1015 1016 SEQ_PUT_FIELD(s, field->prev_pid); 1017 SEQ_PUT_FIELD(s, field->prev_prio); 1018 SEQ_PUT_FIELD(s, field->prev_state); 1019 SEQ_PUT_FIELD(s, field->next_cpu); 1020 SEQ_PUT_FIELD(s, field->next_pid); 1021 SEQ_PUT_FIELD(s, field->next_prio); 1022 SEQ_PUT_FIELD(s, field->next_state); 1023 1024 return trace_handle_return(s); 1025 } 1026 1027 static struct trace_event_functions trace_ctx_funcs = { 1028 .trace = trace_ctx_print, 1029 .raw = trace_ctx_raw, 1030 .hex = trace_ctx_hex, 1031 .binary = trace_ctxwake_bin, 1032 }; 1033 1034 static struct trace_event trace_ctx_event = { 1035 .type = TRACE_CTX, 1036 .funcs = &trace_ctx_funcs, 1037 }; 1038 1039 static struct trace_event_functions trace_wake_funcs = { 1040 .trace = trace_wake_print, 1041 .raw = trace_wake_raw, 1042 .hex = trace_wake_hex, 1043 .binary = trace_ctxwake_bin, 1044 }; 1045 1046 static struct trace_event trace_wake_event = { 1047 .type = TRACE_WAKE, 1048 .funcs = &trace_wake_funcs, 1049 }; 1050 1051 /* TRACE_STACK */ 1052 1053 static enum print_line_t trace_stack_print(struct trace_iterator *iter, 1054 int flags, struct trace_event *event) 1055 { 1056 struct stack_entry *field; 1057 struct trace_seq *s = &iter->seq; 1058 unsigned long *p; 1059 unsigned long *end; 1060 1061 trace_assign_type(field, iter->ent); 1062 end = (unsigned long *)((long)iter->ent + iter->ent_size); 1063 1064 trace_seq_puts(s, "<stack trace>\n"); 1065 1066 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) { 1067 1068 if (trace_seq_has_overflowed(s)) 1069 break; 1070 1071 trace_seq_puts(s, " => "); 1072 seq_print_ip_sym(s, *p, flags); 1073 trace_seq_putc(s, '\n'); 1074 } 1075 1076 return trace_handle_return(s); 1077 } 1078 1079 static struct trace_event_functions trace_stack_funcs = { 1080 .trace = trace_stack_print, 1081 }; 1082 1083 static struct trace_event trace_stack_event = { 1084 .type = TRACE_STACK, 1085 .funcs = &trace_stack_funcs, 1086 }; 1087 1088 /* TRACE_USER_STACK */ 1089 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter, 1090 int flags, struct trace_event *event) 1091 { 1092 struct trace_array *tr = iter->tr; 1093 struct userstack_entry *field; 1094 struct trace_seq *s = &iter->seq; 1095 struct mm_struct *mm = NULL; 1096 unsigned int i; 1097 1098 trace_assign_type(field, iter->ent); 1099 1100 trace_seq_puts(s, "<user stack trace>\n"); 1101 1102 if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) { 1103 struct task_struct *task; 1104 /* 1105 * we do the lookup on the thread group leader, 1106 * since individual threads might have already quit! 1107 */ 1108 rcu_read_lock(); 1109 task = find_task_by_vpid(field->tgid); 1110 if (task) 1111 mm = get_task_mm(task); 1112 rcu_read_unlock(); 1113 } 1114 1115 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { 1116 unsigned long ip = field->caller[i]; 1117 1118 if (!ip || trace_seq_has_overflowed(s)) 1119 break; 1120 1121 trace_seq_puts(s, " => "); 1122 seq_print_user_ip(s, mm, ip, flags); 1123 trace_seq_putc(s, '\n'); 1124 } 1125 1126 if (mm) 1127 mmput(mm); 1128 1129 return trace_handle_return(s); 1130 } 1131 1132 static struct trace_event_functions trace_user_stack_funcs = { 1133 .trace = trace_user_stack_print, 1134 }; 1135 1136 static struct trace_event trace_user_stack_event = { 1137 .type = TRACE_USER_STACK, 1138 .funcs = &trace_user_stack_funcs, 1139 }; 1140 1141 /* TRACE_HWLAT */ 1142 static enum print_line_t 1143 trace_hwlat_print(struct trace_iterator *iter, int flags, 1144 struct trace_event *event) 1145 { 1146 struct trace_entry *entry = iter->ent; 1147 struct trace_seq *s = &iter->seq; 1148 struct hwlat_entry *field; 1149 1150 trace_assign_type(field, entry); 1151 1152 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d", 1153 field->seqnum, 1154 field->duration, 1155 field->outer_duration, 1156 (long long)field->timestamp.tv_sec, 1157 field->timestamp.tv_nsec, field->count); 1158 1159 if (field->nmi_count) { 1160 /* 1161 * The generic sched_clock() is not NMI safe, thus 1162 * we only record the count and not the time. 1163 */ 1164 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK)) 1165 trace_seq_printf(s, " nmi-total:%llu", 1166 field->nmi_total_ts); 1167 trace_seq_printf(s, " nmi-count:%u", 1168 field->nmi_count); 1169 } 1170 1171 trace_seq_putc(s, '\n'); 1172 1173 return trace_handle_return(s); 1174 } 1175 1176 static enum print_line_t 1177 trace_hwlat_raw(struct trace_iterator *iter, int flags, 1178 struct trace_event *event) 1179 { 1180 struct hwlat_entry *field; 1181 struct trace_seq *s = &iter->seq; 1182 1183 trace_assign_type(field, iter->ent); 1184 1185 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n", 1186 field->duration, 1187 field->outer_duration, 1188 (long long)field->timestamp.tv_sec, 1189 field->timestamp.tv_nsec, 1190 field->seqnum); 1191 1192 return trace_handle_return(s); 1193 } 1194 1195 static struct trace_event_functions trace_hwlat_funcs = { 1196 .trace = trace_hwlat_print, 1197 .raw = trace_hwlat_raw, 1198 }; 1199 1200 static struct trace_event trace_hwlat_event = { 1201 .type = TRACE_HWLAT, 1202 .funcs = &trace_hwlat_funcs, 1203 }; 1204 1205 /* TRACE_OSNOISE */ 1206 static enum print_line_t 1207 trace_osnoise_print(struct trace_iterator *iter, int flags, 1208 struct trace_event *event) 1209 { 1210 struct trace_entry *entry = iter->ent; 1211 struct trace_seq *s = &iter->seq; 1212 struct osnoise_entry *field; 1213 u64 ratio, ratio_dec; 1214 u64 net_runtime; 1215 1216 trace_assign_type(field, entry); 1217 1218 /* 1219 * compute the available % of cpu time. 1220 */ 1221 net_runtime = field->runtime - field->noise; 1222 ratio = net_runtime * 10000000; 1223 do_div(ratio, field->runtime); 1224 ratio_dec = do_div(ratio, 100000); 1225 1226 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu", 1227 field->runtime, 1228 field->noise, 1229 ratio, ratio_dec, 1230 field->max_sample); 1231 1232 trace_seq_printf(s, " %6u", field->hw_count); 1233 trace_seq_printf(s, " %6u", field->nmi_count); 1234 trace_seq_printf(s, " %6u", field->irq_count); 1235 trace_seq_printf(s, " %6u", field->softirq_count); 1236 trace_seq_printf(s, " %6u", field->thread_count); 1237 1238 trace_seq_putc(s, '\n'); 1239 1240 return trace_handle_return(s); 1241 } 1242 1243 static enum print_line_t 1244 trace_osnoise_raw(struct trace_iterator *iter, int flags, 1245 struct trace_event *event) 1246 { 1247 struct osnoise_entry *field; 1248 struct trace_seq *s = &iter->seq; 1249 1250 trace_assign_type(field, iter->ent); 1251 1252 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n", 1253 field->runtime, 1254 field->noise, 1255 field->max_sample, 1256 field->hw_count, 1257 field->nmi_count, 1258 field->irq_count, 1259 field->softirq_count, 1260 field->thread_count); 1261 1262 return trace_handle_return(s); 1263 } 1264 1265 static struct trace_event_functions trace_osnoise_funcs = { 1266 .trace = trace_osnoise_print, 1267 .raw = trace_osnoise_raw, 1268 }; 1269 1270 static struct trace_event trace_osnoise_event = { 1271 .type = TRACE_OSNOISE, 1272 .funcs = &trace_osnoise_funcs, 1273 }; 1274 1275 /* TRACE_TIMERLAT */ 1276 static enum print_line_t 1277 trace_timerlat_print(struct trace_iterator *iter, int flags, 1278 struct trace_event *event) 1279 { 1280 struct trace_entry *entry = iter->ent; 1281 struct trace_seq *s = &iter->seq; 1282 struct timerlat_entry *field; 1283 1284 trace_assign_type(field, entry); 1285 1286 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n", 1287 field->seqnum, 1288 field->context ? "thread" : "irq", 1289 field->timer_latency); 1290 1291 return trace_handle_return(s); 1292 } 1293 1294 static enum print_line_t 1295 trace_timerlat_raw(struct trace_iterator *iter, int flags, 1296 struct trace_event *event) 1297 { 1298 struct timerlat_entry *field; 1299 struct trace_seq *s = &iter->seq; 1300 1301 trace_assign_type(field, iter->ent); 1302 1303 trace_seq_printf(s, "%u %d %llu\n", 1304 field->seqnum, 1305 field->context, 1306 field->timer_latency); 1307 1308 return trace_handle_return(s); 1309 } 1310 1311 static struct trace_event_functions trace_timerlat_funcs = { 1312 .trace = trace_timerlat_print, 1313 .raw = trace_timerlat_raw, 1314 }; 1315 1316 static struct trace_event trace_timerlat_event = { 1317 .type = TRACE_TIMERLAT, 1318 .funcs = &trace_timerlat_funcs, 1319 }; 1320 1321 /* TRACE_BPUTS */ 1322 static enum print_line_t 1323 trace_bputs_print(struct trace_iterator *iter, int flags, 1324 struct trace_event *event) 1325 { 1326 struct trace_entry *entry = iter->ent; 1327 struct trace_seq *s = &iter->seq; 1328 struct bputs_entry *field; 1329 1330 trace_assign_type(field, entry); 1331 1332 seq_print_ip_sym(s, field->ip, flags); 1333 trace_seq_puts(s, ": "); 1334 trace_seq_puts(s, field->str); 1335 1336 return trace_handle_return(s); 1337 } 1338 1339 1340 static enum print_line_t 1341 trace_bputs_raw(struct trace_iterator *iter, int flags, 1342 struct trace_event *event) 1343 { 1344 struct bputs_entry *field; 1345 struct trace_seq *s = &iter->seq; 1346 1347 trace_assign_type(field, iter->ent); 1348 1349 trace_seq_printf(s, ": %lx : ", field->ip); 1350 trace_seq_puts(s, field->str); 1351 1352 return trace_handle_return(s); 1353 } 1354 1355 static struct trace_event_functions trace_bputs_funcs = { 1356 .trace = trace_bputs_print, 1357 .raw = trace_bputs_raw, 1358 }; 1359 1360 static struct trace_event trace_bputs_event = { 1361 .type = TRACE_BPUTS, 1362 .funcs = &trace_bputs_funcs, 1363 }; 1364 1365 /* TRACE_BPRINT */ 1366 static enum print_line_t 1367 trace_bprint_print(struct trace_iterator *iter, int flags, 1368 struct trace_event *event) 1369 { 1370 struct trace_entry *entry = iter->ent; 1371 struct trace_seq *s = &iter->seq; 1372 struct bprint_entry *field; 1373 1374 trace_assign_type(field, entry); 1375 1376 seq_print_ip_sym(s, field->ip, flags); 1377 trace_seq_puts(s, ": "); 1378 trace_seq_bprintf(s, field->fmt, field->buf); 1379 1380 return trace_handle_return(s); 1381 } 1382 1383 1384 static enum print_line_t 1385 trace_bprint_raw(struct trace_iterator *iter, int flags, 1386 struct trace_event *event) 1387 { 1388 struct bprint_entry *field; 1389 struct trace_seq *s = &iter->seq; 1390 1391 trace_assign_type(field, iter->ent); 1392 1393 trace_seq_printf(s, ": %lx : ", field->ip); 1394 trace_seq_bprintf(s, field->fmt, field->buf); 1395 1396 return trace_handle_return(s); 1397 } 1398 1399 static struct trace_event_functions trace_bprint_funcs = { 1400 .trace = trace_bprint_print, 1401 .raw = trace_bprint_raw, 1402 }; 1403 1404 static struct trace_event trace_bprint_event = { 1405 .type = TRACE_BPRINT, 1406 .funcs = &trace_bprint_funcs, 1407 }; 1408 1409 /* TRACE_PRINT */ 1410 static enum print_line_t trace_print_print(struct trace_iterator *iter, 1411 int flags, struct trace_event *event) 1412 { 1413 struct print_entry *field; 1414 struct trace_seq *s = &iter->seq; 1415 1416 trace_assign_type(field, iter->ent); 1417 1418 seq_print_ip_sym(s, field->ip, flags); 1419 trace_seq_printf(s, ": %s", field->buf); 1420 1421 return trace_handle_return(s); 1422 } 1423 1424 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags, 1425 struct trace_event *event) 1426 { 1427 struct print_entry *field; 1428 1429 trace_assign_type(field, iter->ent); 1430 1431 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf); 1432 1433 return trace_handle_return(&iter->seq); 1434 } 1435 1436 static struct trace_event_functions trace_print_funcs = { 1437 .trace = trace_print_print, 1438 .raw = trace_print_raw, 1439 }; 1440 1441 static struct trace_event trace_print_event = { 1442 .type = TRACE_PRINT, 1443 .funcs = &trace_print_funcs, 1444 }; 1445 1446 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags, 1447 struct trace_event *event) 1448 { 1449 struct raw_data_entry *field; 1450 int i; 1451 1452 trace_assign_type(field, iter->ent); 1453 1454 trace_seq_printf(&iter->seq, "# %x buf:", field->id); 1455 1456 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++) 1457 trace_seq_printf(&iter->seq, " %02x", 1458 (unsigned char)field->buf[i]); 1459 1460 trace_seq_putc(&iter->seq, '\n'); 1461 1462 return trace_handle_return(&iter->seq); 1463 } 1464 1465 static struct trace_event_functions trace_raw_data_funcs = { 1466 .trace = trace_raw_data, 1467 .raw = trace_raw_data, 1468 }; 1469 1470 static struct trace_event trace_raw_data_event = { 1471 .type = TRACE_RAW_DATA, 1472 .funcs = &trace_raw_data_funcs, 1473 }; 1474 1475 static enum print_line_t 1476 trace_func_repeats_raw(struct trace_iterator *iter, int flags, 1477 struct trace_event *event) 1478 { 1479 struct func_repeats_entry *field; 1480 struct trace_seq *s = &iter->seq; 1481 1482 trace_assign_type(field, iter->ent); 1483 1484 trace_seq_printf(s, "%lu %lu %u %llu\n", 1485 field->ip, 1486 field->parent_ip, 1487 field->count, 1488 FUNC_REPEATS_GET_DELTA_TS(field)); 1489 1490 return trace_handle_return(s); 1491 } 1492 1493 static enum print_line_t 1494 trace_func_repeats_print(struct trace_iterator *iter, int flags, 1495 struct trace_event *event) 1496 { 1497 struct func_repeats_entry *field; 1498 struct trace_seq *s = &iter->seq; 1499 1500 trace_assign_type(field, iter->ent); 1501 1502 print_fn_trace(s, field->ip, field->parent_ip, flags); 1503 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count); 1504 trace_print_time(s, iter, 1505 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field)); 1506 trace_seq_puts(s, ")\n"); 1507 1508 return trace_handle_return(s); 1509 } 1510 1511 static struct trace_event_functions trace_func_repeats_funcs = { 1512 .trace = trace_func_repeats_print, 1513 .raw = trace_func_repeats_raw, 1514 }; 1515 1516 static struct trace_event trace_func_repeats_event = { 1517 .type = TRACE_FUNC_REPEATS, 1518 .funcs = &trace_func_repeats_funcs, 1519 }; 1520 1521 static struct trace_event *events[] __initdata = { 1522 &trace_fn_event, 1523 &trace_ctx_event, 1524 &trace_wake_event, 1525 &trace_stack_event, 1526 &trace_user_stack_event, 1527 &trace_bputs_event, 1528 &trace_bprint_event, 1529 &trace_print_event, 1530 &trace_hwlat_event, 1531 &trace_osnoise_event, 1532 &trace_timerlat_event, 1533 &trace_raw_data_event, 1534 &trace_func_repeats_event, 1535 NULL 1536 }; 1537 1538 __init int init_events(void) 1539 { 1540 struct trace_event *event; 1541 int i, ret; 1542 1543 for (i = 0; events[i]; i++) { 1544 event = events[i]; 1545 ret = register_trace_event(event); 1546 WARN_ONCE(!ret, "event %d failed to register", event->type); 1547 } 1548 1549 return 0; 1550 } 1551