kernel/trace/trace_output.c

   1 /*
   2  * trace_output.c
   3  *
   4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11
  12 #include "trace_output.h"
  13
  14 /* must be a power of 2 */
  15 #define EVENT_HASHSIZE  128
  16
  17 DECLARE_RWSEM(trace_event_sem);
  18
  19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  20
  21 static int next_event_type = __TRACE_LAST_TYPE + 1;
  22
  23 #define EVENT_STORAGE_SIZE 128
  24 static DEFINE_MUTEX(event_storage_mutex);
  25 static char event_storage[EVENT_STORAGE_SIZE];
  26
  27 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  28 {
  29         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  30         int ret;
  31
  32         ret = seq_write(m, s->buffer, len);
  33
  34         /*
  35          * Only reset this buffer if we successfully wrote to the
  36          * seq_file buffer.
  37          */
  38         if (!ret)
  39                 trace_seq_init(s);
  40
  41         return ret;
  42 }
  43
  44 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
  45 {
  46         struct trace_seq *s = &iter->seq;
  47         struct trace_entry *entry = iter->ent;
  48         struct bputs_entry *field;
  49         int ret;
  50
  51         trace_assign_type(field, entry);
  52
  53         ret = trace_seq_puts(s, field->str);
  54         if (!ret)
  55                 return TRACE_TYPE_PARTIAL_LINE;
  56
  57         return TRACE_TYPE_HANDLED;
  58 }
  59
  60 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  61 {
  62         struct trace_seq *s = &iter->seq;
  63         struct trace_entry *entry = iter->ent;
  64         struct bprint_entry *field;
  65         int ret;
  66
  67         trace_assign_type(field, entry);
  68
  69         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  70         if (!ret)
  71                 return TRACE_TYPE_PARTIAL_LINE;
  72
  73         return TRACE_TYPE_HANDLED;
  74 }
  75
  76 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  77 {
  78         struct trace_seq *s = &iter->seq;
  79         struct trace_entry *entry = iter->ent;
  80         struct print_entry *field;
  81         int ret;
  82
  83         trace_assign_type(field, entry);
  84
  85         ret = trace_seq_puts(s, field->buf);
  86         if (!ret)
  87                 return TRACE_TYPE_PARTIAL_LINE;
  88
  89         return TRACE_TYPE_HANDLED;
  90 }
  91
  92 /**
  93  * trace_seq_printf - sequence printing of trace information
  94  * @s: trace sequence descriptor
  95  * @fmt: printf format string
  96  *
  97  * It returns 0 if the trace oversizes the buffer's free
  98  * space, 1 otherwise.
  99  *
 100  * The tracer may use either sequence operations or its own
 101  * copy to user routines. To simplify formating of a trace
 102  * trace_seq_printf is used to store strings into a special
 103  * buffer (@s). Then the output may be either used by
 104  * the sequencer or pulled into another buffer.
 105  */
 106 int
 107 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 108 {
 109         int len = (PAGE_SIZE - 1) - s->len;
 110         va_list ap;
 111         int ret;
 112
 113         if (s->full || !len)
 114                 return 0;
 115
 116         va_start(ap, fmt);
 117         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
 118         va_end(ap);
 119
 120         /* If we can't write it all, don't bother writing anything */
 121         if (ret >= len) {
 122                 s->full = 1;
 123                 return 0;
 124         }
 125
 126         s->len += ret;
 127
 128         return 1;
 129 }
 130 EXPORT_SYMBOL_GPL(trace_seq_printf);
 131
 132 /**
 133  * trace_seq_vprintf - sequence printing of trace information
 134  * @s: trace sequence descriptor
 135  * @fmt: printf format string
 136  *
 137  * The tracer may use either sequence operations or its own
 138  * copy to user routines. To simplify formating of a trace
 139  * trace_seq_printf is used to store strings into a special
 140  * buffer (@s). Then the output may be either used by
 141  * the sequencer or pulled into another buffer.
 142  */
 143 int
 144 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 145 {
 146         int len = (PAGE_SIZE - 1) - s->len;
 147         int ret;
 148
 149         if (s->full || !len)
 150                 return 0;
 151
 152         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 153
 154         /* If we can't write it all, don't bother writing anything */
 155         if (ret >= len) {
 156                 s->full = 1;
 157                 return 0;
 158         }
 159
 160         s->len += ret;
 161
 162         return len;
 163 }
 164 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 165
 166 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 167 {
 168         int len = (PAGE_SIZE - 1) - s->len;
 169         int ret;
 170
 171         if (s->full || !len)
 172                 return 0;
 173
 174         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 175
 176         /* If we can't write it all, don't bother writing anything */
 177         if (ret >= len) {
 178                 s->full = 1;
 179                 return 0;
 180         }
 181
 182         s->len += ret;
 183
 184         return len;
 185 }
 186
 187 /**
 188  * trace_seq_puts - trace sequence printing of simple string
 189  * @s: trace sequence descriptor
 190  * @str: simple string to record
 191  *
 192  * The tracer may use either the sequence operations or its own
 193  * copy to user routines. This function records a simple string
 194  * into a special buffer (@s) for later retrieval by a sequencer
 195  * or other mechanism.
 196  */
 197 int trace_seq_puts(struct trace_seq *s, const char *str)
 198 {
 199         int len = strlen(str);
 200
 201         if (s->full)
 202                 return 0;
 203
 204         if (len > ((PAGE_SIZE - 1) - s->len)) {
 205                 s->full = 1;
 206                 return 0;
 207         }
 208
 209         memcpy(s->buffer + s->len, str, len);
 210         s->len += len;
 211
 212         return len;
 213 }
 214
 215 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 216 {
 217         if (s->full)
 218                 return 0;
 219
 220         if (s->len >= (PAGE_SIZE - 1)) {
 221                 s->full = 1;
 222                 return 0;
 223         }
 224
 225         s->buffer[s->len++] = c;
 226
 227         return 1;
 228 }
 229 EXPORT_SYMBOL(trace_seq_putc);
 230
 231 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 232 {
 233         if (s->full)
 234                 return 0;
 235
 236         if (len > ((PAGE_SIZE - 1) - s->len)) {
 237                 s->full = 1;
 238                 return 0;
 239         }
 240
 241         memcpy(s->buffer + s->len, mem, len);
 242         s->len += len;
 243
 244         return len;
 245 }
 246
 247 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 248 {
 249         unsigned char hex[HEX_CHARS];
 250         const unsigned char *data = mem;
 251         int i, j;
 252
 253         if (s->full)
 254                 return 0;
 255
 256 #ifdef __BIG_ENDIAN
 257         for (i = 0, j = 0; i < len; i++) {
 258 #else
 259         for (i = len-1, j = 0; i >= 0; i--) {
 260 #endif
 261                 hex[j++] = hex_asc_hi(data[i]);
 262                 hex[j++] = hex_asc_lo(data[i]);
 263         }
 264         hex[j++] = ' ';
 265
 266         return trace_seq_putmem(s, hex, j);
 267 }
 268
 269 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 270 {
 271         void *ret;
 272
 273         if (s->full)
 274                 return NULL;
 275
 276         if (len > ((PAGE_SIZE - 1) - s->len)) {
 277                 s->full = 1;
 278                 return NULL;
 279         }
 280
 281         ret = s->buffer + s->len;
 282         s->len += len;
 283
 284         return ret;
 285 }
 286
 287 int trace_seq_path(struct trace_seq *s, const struct path *path)
 288 {
 289         unsigned char *p;
 290
 291         if (s->full)
 292                 return 0;
 293
 294         if (s->len >= (PAGE_SIZE - 1)) {
 295                 s->full = 1;
 296                 return 0;
 297         }
 298
 299         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 300         if (!IS_ERR(p)) {
 301                 p = mangle_path(s->buffer + s->len, p, "\n");
 302                 if (p) {
 303                         s->len = p - s->buffer;
 304                         return 1;
 305                 }
 306         } else {
 307                 s->buffer[s->len++] = '?';
 308                 return 1;
 309         }
 310
 311         s->full = 1;
 312         return 0;
 313 }
 314
 315 const char *
 316 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 317                        unsigned long flags,
 318                        const struct trace_print_flags *flag_array)
 319 {
 320         unsigned long mask;
 321         const char *str;
 322         const char *ret = p->buffer + p->len;
 323         int i, first = 1;
 324
 325         for (i = 0;  flag_array[i].name && flags; i++) {
 326
 327                 mask = flag_array[i].mask;
 328                 if ((flags & mask) != mask)
 329                         continue;
 330
 331                 str = flag_array[i].name;
 332                 flags &= ~mask;
 333                 if (!first && delim)
 334                         trace_seq_puts(p, delim);
 335                 else
 336                         first = 0;
 337                 trace_seq_puts(p, str);
 338         }
 339
 340         /* check for left over flags */
 341         if (flags) {
 342                 if (!first && delim)
 343                         trace_seq_puts(p, delim);
 344                 trace_seq_printf(p, "0x%lx", flags);
 345         }
 346
 347         trace_seq_putc(p, 0);
 348
 349         return ret;
 350 }
 351 EXPORT_SYMBOL(ftrace_print_flags_seq);
 352
 353 const char *
 354 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 355                          const struct trace_print_flags *symbol_array)
 356 {
 357         int i;
 358         const char *ret = p->buffer + p->len;
 359
 360         for (i = 0;  symbol_array[i].name; i++) {
 361
 362                 if (val != symbol_array[i].mask)
 363                         continue;
 364
 365                 trace_seq_puts(p, symbol_array[i].name);
 366                 break;
 367         }
 368
 369         if (ret == (const char *)(p->buffer + p->len))
 370                 trace_seq_printf(p, "0x%lx", val);
 371
 372         trace_seq_putc(p, 0);
 373
 374         return ret;
 375 }
 376 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 377
 378 #if BITS_PER_LONG == 32
 379 const char *
 380 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 381                          const struct trace_print_flags_u64 *symbol_array)
 382 {
 383         int i;
 384         const char *ret = p->buffer + p->len;
 385
 386         for (i = 0;  symbol_array[i].name; i++) {
 387
 388                 if (val != symbol_array[i].mask)
 389                         continue;
 390
 391                 trace_seq_puts(p, symbol_array[i].name);
 392                 break;
 393         }
 394
 395         if (ret == (const char *)(p->buffer + p->len))
 396                 trace_seq_printf(p, "0x%llx", val);
 397
 398         trace_seq_putc(p, 0);
 399
 400         return ret;
 401 }
 402 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
 403 #endif
 404
 405 const char *
 406 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 407 {
 408         int i;
 409         const char *ret = p->buffer + p->len;
 410
 411         for (i = 0; i < buf_len; i++)
 412                 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
 413
 414         trace_seq_putc(p, 0);
 415
 416         return ret;
 417 }
 418 EXPORT_SYMBOL(ftrace_print_hex_seq);
 419
 420 int ftrace_raw_output_prep(struct trace_iterator *iter,
 421                            struct trace_event *trace_event)
 422 {
 423         struct ftrace_event_call *event;
 424         struct trace_seq *s = &iter->seq;
 425         struct trace_seq *p = &iter->tmp_seq;
 426         struct trace_entry *entry;
 427         int ret;
 428
 429         event = container_of(trace_event, struct ftrace_event_call, event);
 430         entry = iter->ent;
 431
 432         if (entry->type != event->event.type) {
 433                 WARN_ON_ONCE(1);
 434                 return TRACE_TYPE_UNHANDLED;
 435         }
 436
 437         trace_seq_init(p);
 438         ret = trace_seq_printf(s, "%s: ", event->name);
 439         if (!ret)
 440                 return TRACE_TYPE_PARTIAL_LINE;
 441
 442         return 0;
 443 }
 444 EXPORT_SYMBOL(ftrace_raw_output_prep);
 445
 446 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
 447                              char *fmt, va_list ap)
 448 {
 449         struct trace_seq *s = &iter->seq;
 450         int ret;
 451
 452         ret = trace_seq_printf(s, "%s: ", name);
 453         if (!ret)
 454                 return TRACE_TYPE_PARTIAL_LINE;
 455
 456         ret = trace_seq_vprintf(s, fmt, ap);
 457
 458         if (!ret)
 459                 return TRACE_TYPE_PARTIAL_LINE;
 460
 461         return TRACE_TYPE_HANDLED;
 462 }
 463
 464 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 465 {
 466         va_list ap;
 467         int ret;
 468
 469         va_start(ap, fmt);
 470         ret = ftrace_output_raw(iter, name, fmt, ap);
 471         va_end(ap);
 472
 473         return ret;
 474 }
 475 EXPORT_SYMBOL_GPL(ftrace_output_call);
 476
 477 int ftrace_event_define_field(struct ftrace_event_call *call,
 478                               char *type, int len, char *item, int offset,
 479                               int field_size, int sign, int filter)
 480 {
 481         int ret;
 482
 483         mutex_lock(&event_storage_mutex);
 484         snprintf(event_storage, sizeof(event_storage),
 485                  "%s[%d]", type, len);
 486         ret = trace_define_field(call, event_storage, item, offset,
 487                                  field_size, sign, filter);
 488         mutex_unlock(&event_storage_mutex);
 489
 490         return ret;
 491 }
 492 EXPORT_SYMBOL_GPL(ftrace_event_define_field);
 493
 494 #ifdef CONFIG_KRETPROBES
 495 static inline const char *kretprobed(const char *name)
 496 {
 497         static const char tramp_name[] = "kretprobe_trampoline";
 498         int size = sizeof(tramp_name);
 499
 500         if (strncmp(tramp_name, name, size) == 0)
 501                 return "[unknown/kretprobe'd]";
 502         return name;
 503 }
 504 #else
 505 static inline const char *kretprobed(const char *name)
 506 {
 507         return name;
 508 }
 509 #endif /* CONFIG_KRETPROBES */
 510
 511 static int
 512 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 513 {
 514 #ifdef CONFIG_KALLSYMS
 515         char str[KSYM_SYMBOL_LEN];
 516         const char *name;
 517
 518         kallsyms_lookup(address, NULL, NULL, NULL, str);
 519
 520         name = kretprobed(str);
 521
 522         return trace_seq_printf(s, fmt, name);
 523 #endif
 524         return 1;
 525 }
 526
 527 static int
 528 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 529                      unsigned long address)
 530 {
 531 #ifdef CONFIG_KALLSYMS
 532         char str[KSYM_SYMBOL_LEN];
 533         const char *name;
 534
 535         sprint_symbol(str, address);
 536         name = kretprobed(str);
 537
 538         return trace_seq_printf(s, fmt, name);
 539 #endif
 540         return 1;
 541 }
 542
 543 #ifndef CONFIG_64BIT
 544 # define IP_FMT "%08lx"
 545 #else
 546 # define IP_FMT "%016lx"
 547 #endif
 548
 549 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 550                       unsigned long ip, unsigned long sym_flags)
 551 {
 552         struct file *file = NULL;
 553         unsigned long vmstart = 0;
 554         int ret = 1;
 555
 556         if (s->full)
 557                 return 0;
 558
 559         if (mm) {
 560                 const struct vm_area_struct *vma;
 561
 562                 down_read(&mm->mmap_sem);
 563                 vma = find_vma(mm, ip);
 564                 if (vma) {
 565                         file = vma->vm_file;
 566                         vmstart = vma->vm_start;
 567                 }
 568                 if (file) {
 569                         ret = trace_seq_path(s, &file->f_path);
 570                         if (ret)
 571                                 ret = trace_seq_printf(s, "[+0x%lx]",
 572                                                        ip - vmstart);
 573                 }
 574                 up_read(&mm->mmap_sem);
 575         }
 576         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 577                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 578         return ret;
 579 }
 580
 581 int
 582 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 583                       unsigned long sym_flags)
 584 {
 585         struct mm_struct *mm = NULL;
 586         int ret = 1;
 587         unsigned int i;
 588
 589         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 590                 struct task_struct *task;
 591                 /*
 592                  * we do the lookup on the thread group leader,
 593                  * since individual threads might have already quit!
 594                  */
 595                 rcu_read_lock();
 596                 task = find_task_by_vpid(entry->tgid);
 597                 if (task)
 598                         mm = get_task_mm(task);
 599                 rcu_read_unlock();
 600         }
 601
 602         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 603                 unsigned long ip = entry->caller[i];
 604
 605                 if (ip == ULONG_MAX || !ret)
 606                         break;
 607                 if (ret)
 608                         ret = trace_seq_puts(s, " => ");
 609                 if (!ip) {
 610                         if (ret)
 611                                 ret = trace_seq_puts(s, "??");
 612                         if (ret)
 613                                 ret = trace_seq_putc(s, '\n');
 614                         continue;
 615                 }
 616                 if (!ret)
 617                         break;
 618                 if (ret)
 619                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 620                 ret = trace_seq_putc(s, '\n');
 621         }
 622
 623         if (mm)
 624                 mmput(mm);
 625         return ret;
 626 }
 627
 628 int
 629 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 630 {
 631         int ret;
 632
 633         if (!ip)
 634                 return trace_seq_putc(s, '0');
 635
 636         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 637                 ret = seq_print_sym_offset(s, "%s", ip);
 638         else
 639                 ret = seq_print_sym_short(s, "%s", ip);
 640
 641         if (!ret)
 642                 return 0;
 643
 644         if (sym_flags & TRACE_ITER_SYM_ADDR)
 645                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 646         return ret;
 647 }
 648
 649 /**
 650  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 651  * @s: trace seq struct to write to
 652  * @entry: The trace entry field from the ring buffer
 653  *
 654  * Prints the generic fields of irqs off, in hard or softirq, preempt
 655  * count.
 656  */
 657 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 658 {
 659         char hardsoft_irq;
 660         char need_resched;
 661         char irqs_off;
 662         int hardirq;
 663         int softirq;
 664         int ret;
 665
 666         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 667         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 668
 669         irqs_off =
 670                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 671                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 672                 '.';
 673
 674         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 675                                 TRACE_FLAG_PREEMPT_RESCHED)) {
 676         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 677                 need_resched = 'N';
 678                 break;
 679         case TRACE_FLAG_NEED_RESCHED:
 680                 need_resched = 'n';
 681                 break;
 682         case TRACE_FLAG_PREEMPT_RESCHED:
 683                 need_resched = 'p';
 684                 break;
 685         default:
 686                 need_resched = '.';
 687                 break;
 688         }
 689
 690         hardsoft_irq =
 691                 (hardirq && softirq) ? 'H' :
 692                 hardirq ? 'h' :
 693                 softirq ? 's' :
 694                 '.';
 695
 696         if (!trace_seq_printf(s, "%c%c%c",
 697                               irqs_off, need_resched, hardsoft_irq))
 698                 return 0;
 699
 700         if (entry->preempt_count)
 701                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
 702         else
 703                 ret = trace_seq_putc(s, '.');
 704
 705         return ret;
 706 }
 707
 708 static int
 709 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 710 {
 711         char comm[TASK_COMM_LEN];
 712
 713         trace_find_cmdline(entry->pid, comm);
 714
 715         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 716                               comm, entry->pid, cpu))
 717                 return 0;
 718
 719         return trace_print_lat_fmt(s, entry);
 720 }
 721
 722 static unsigned long preempt_mark_thresh_us = 100;
 723
 724 static int
 725 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 726 {
 727         unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
 728         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 729         unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 730         unsigned long long rel_ts = next_ts - iter->ts;
 731         struct trace_seq *s = &iter->seq;
 732
 733         if (in_ns) {
 734                 abs_ts = ns2usecs(abs_ts);
 735                 rel_ts = ns2usecs(rel_ts);
 736         }
 737
 738         if (verbose && in_ns) {
 739                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 740                 unsigned long abs_msec = (unsigned long)abs_ts;
 741                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 742                 unsigned long rel_msec = (unsigned long)rel_ts;
 743
 744                 return trace_seq_printf(
 745                                 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 746                                 ns2usecs(iter->ts),
 747                                 abs_msec, abs_usec,
 748                                 rel_msec, rel_usec);
 749         } else if (verbose && !in_ns) {
 750                 return trace_seq_printf(
 751                                 s, "[%016llx] %lld (+%lld): ",
 752                                 iter->ts, abs_ts, rel_ts);
 753         } else if (!verbose && in_ns) {
 754                 return trace_seq_printf(
 755                                 s, " %4lldus%c: ",
 756                                 abs_ts,
 757                                 rel_ts > preempt_mark_thresh_us ? '!' :
 758                                   rel_ts > 1 ? '+' : ' ');
 759         } else { /* !verbose && !in_ns */
 760                 return trace_seq_printf(s, " %4lld: ", abs_ts);
 761         }
 762 }
 763
 764 int trace_print_context(struct trace_iterator *iter)
 765 {
 766         struct trace_seq *s = &iter->seq;
 767         struct trace_entry *entry = iter->ent;
 768         unsigned long long t;
 769         unsigned long secs, usec_rem;
 770         char comm[TASK_COMM_LEN];
 771         int ret;
 772
 773         trace_find_cmdline(entry->pid, comm);
 774
 775         ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
 776                                comm, entry->pid, iter->cpu);
 777         if (!ret)
 778                 return 0;
 779
 780         if (trace_flags & TRACE_ITER_IRQ_INFO) {
 781                 ret = trace_print_lat_fmt(s, entry);
 782                 if (!ret)
 783                         return 0;
 784         }
 785
 786         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 787                 t = ns2usecs(iter->ts);
 788                 usec_rem = do_div(t, USEC_PER_SEC);
 789                 secs = (unsigned long)t;
 790                 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
 791         } else
 792                 return trace_seq_printf(s, " %12llu: ", iter->ts);
 793 }
 794
 795 int trace_print_lat_context(struct trace_iterator *iter)
 796 {
 797         u64 next_ts;
 798         int ret;
 799         /* trace_find_next_entry will reset ent_size */
 800         int ent_size = iter->ent_size;
 801         struct trace_seq *s = &iter->seq;
 802         struct trace_entry *entry = iter->ent,
 803                            *next_entry = trace_find_next_entry(iter, NULL,
 804                                                                &next_ts);
 805         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 806
 807         /* Restore the original ent_size */
 808         iter->ent_size = ent_size;
 809
 810         if (!next_entry)
 811                 next_ts = iter->ts;
 812
 813         if (verbose) {
 814                 char comm[TASK_COMM_LEN];
 815
 816                 trace_find_cmdline(entry->pid, comm);
 817
 818                 ret = trace_seq_printf(
 819                                 s, "%16s %5d %3d %d %08x %08lx ",
 820                                 comm, entry->pid, iter->cpu, entry->flags,
 821                                 entry->preempt_count, iter->idx);
 822         } else {
 823                 ret = lat_print_generic(s, entry, iter->cpu);
 824         }
 825
 826         if (ret)
 827                 ret = lat_print_timestamp(iter, next_ts);
 828
 829         return ret;
 830 }
 831
 832 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 833
 834 static int task_state_char(unsigned long state)
 835 {
 836         int bit = state ? __ffs(state) + 1 : 0;
 837
 838         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 839 }
 840
 841 /**
 842  * ftrace_find_event - find a registered event
 843  * @type: the type of event to look for
 844  *
 845  * Returns an event of type @type otherwise NULL
 846  * Called with trace_event_read_lock() held.
 847  */
 848 struct trace_event *ftrace_find_event(int type)
 849 {
 850         struct trace_event *event;
 851         unsigned key;
 852
 853         key = type & (EVENT_HASHSIZE - 1);
 854
 855         hlist_for_each_entry(event, &event_hash[key], node) {
 856                 if (event->type == type)
 857                         return event;
 858         }
 859
 860         return NULL;
 861 }
 862
 863 static LIST_HEAD(ftrace_event_list);
 864
 865 static int trace_search_list(struct list_head **list)
 866 {
 867         struct trace_event *e;
 868         int last = __TRACE_LAST_TYPE;
 869
 870         if (list_empty(&ftrace_event_list)) {
 871                 *list = &ftrace_event_list;
 872                 return last + 1;
 873         }
 874
 875         /*
 876          * We used up all possible max events,
 877          * lets see if somebody freed one.
 878          */
 879         list_for_each_entry(e, &ftrace_event_list, list) {
 880                 if (e->type != last + 1)
 881                         break;
 882                 last++;
 883         }
 884
 885         /* Did we used up all 65 thousand events??? */
 886         if ((last + 1) > FTRACE_MAX_EVENT)
 887                 return 0;
 888
 889         *list = &e->list;
 890         return last + 1;
 891 }
 892
 893 void trace_event_read_lock(void)
 894 {
 895         down_read(&trace_event_sem);
 896 }
 897
 898 void trace_event_read_unlock(void)
 899 {
 900         up_read(&trace_event_sem);
 901 }
 902
 903 /**
 904  * register_ftrace_event - register output for an event type
 905  * @event: the event type to register
 906  *
 907  * Event types are stored in a hash and this hash is used to
 908  * find a way to print an event. If the @event->type is set
 909  * then it will use that type, otherwise it will assign a
 910  * type to use.
 911  *
 912  * If you assign your own type, please make sure it is added
 913  * to the trace_type enum in trace.h, to avoid collisions
 914  * with the dynamic types.
 915  *
 916  * Returns the event type number or zero on error.
 917  */
 918 int register_ftrace_event(struct trace_event *event)
 919 {
 920         unsigned key;
 921         int ret = 0;
 922
 923         down_write(&trace_event_sem);
 924
 925         if (WARN_ON(!event))
 926                 goto out;
 927
 928         if (WARN_ON(!event->funcs))
 929                 goto out;
 930
 931         INIT_LIST_HEAD(&event->list);
 932
 933         if (!event->type) {
 934                 struct list_head *list = NULL;
 935
 936                 if (next_event_type > FTRACE_MAX_EVENT) {
 937
 938                         event->type = trace_search_list(&list);
 939                         if (!event->type)
 940                                 goto out;
 941
 942                 } else {
 943
 944                         event->type = next_event_type++;
 945                         list = &ftrace_event_list;
 946                 }
 947
 948                 if (WARN_ON(ftrace_find_event(event->type)))
 949                         goto out;
 950
 951                 list_add_tail(&event->list, list);
 952
 953         } else if (event->type > __TRACE_LAST_TYPE) {
 954                 printk(KERN_WARNING "Need to add type to trace.h\n");
 955                 WARN_ON(1);
 956                 goto out;
 957         } else {
 958                 /* Is this event already used */
 959                 if (ftrace_find_event(event->type))
 960                         goto out;
 961         }
 962
 963         if (event->funcs->trace == NULL)
 964                 event->funcs->trace = trace_nop_print;
 965         if (event->funcs->raw == NULL)
 966                 event->funcs->raw = trace_nop_print;
 967         if (event->funcs->hex == NULL)
 968                 event->funcs->hex = trace_nop_print;
 969         if (event->funcs->binary == NULL)
 970                 event->funcs->binary = trace_nop_print;
 971
 972         key = event->type & (EVENT_HASHSIZE - 1);
 973
 974         hlist_add_head(&event->node, &event_hash[key]);
 975
 976         ret = event->type;
 977  out:
 978         up_write(&trace_event_sem);
 979
 980         return ret;
 981 }
 982 EXPORT_SYMBOL_GPL(register_ftrace_event);
 983
 984 /*
 985  * Used by module code with the trace_event_sem held for write.
 986  */
 987 int __unregister_ftrace_event(struct trace_event *event)
 988 {
 989         hlist_del(&event->node);
 990         list_del(&event->list);
 991         return 0;
 992 }
 993
 994 /**
 995  * unregister_ftrace_event - remove a no longer used event
 996  * @event: the event to remove
 997  */
 998 int unregister_ftrace_event(struct trace_event *event)
 999 {
1000         down_write(&trace_event_sem);
1001         __unregister_ftrace_event(event);
1002         up_write(&trace_event_sem);
1003
1004         return 0;
1005 }
1006 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
1007
1008 /*
1009  * Standard events
1010  */
1011
1012 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
1013                                   struct trace_event *event)
1014 {
1015         if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
1016                 return TRACE_TYPE_PARTIAL_LINE;
1017
1018         return TRACE_TYPE_HANDLED;
1019 }
1020
1021 /* TRACE_FN */
1022 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1023                                         struct trace_event *event)
1024 {
1025         struct ftrace_entry *field;
1026         struct trace_seq *s = &iter->seq;
1027
1028         trace_assign_type(field, iter->ent);
1029
1030         if (!seq_print_ip_sym(s, field->ip, flags))
1031                 goto partial;
1032
1033         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
1034                 if (!trace_seq_puts(s, " <-"))
1035                         goto partial;
1036                 if (!seq_print_ip_sym(s,
1037                                       field->parent_ip,
1038                                       flags))
1039                         goto partial;
1040         }
1041         if (!trace_seq_putc(s, '\n'))
1042                 goto partial;
1043
1044         return TRACE_TYPE_HANDLED;
1045
1046  partial:
1047         return TRACE_TYPE_PARTIAL_LINE;
1048 }
1049
1050 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1051                                       struct trace_event *event)
1052 {
1053         struct ftrace_entry *field;
1054
1055         trace_assign_type(field, iter->ent);
1056
1057         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
1058                               field->ip,
1059                               field->parent_ip))
1060                 return TRACE_TYPE_PARTIAL_LINE;
1061
1062         return TRACE_TYPE_HANDLED;
1063 }
1064
1065 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1066                                       struct trace_event *event)
1067 {
1068         struct ftrace_entry *field;
1069         struct trace_seq *s = &iter->seq;
1070
1071         trace_assign_type(field, iter->ent);
1072
1073         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
1074         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
1075
1076         return TRACE_TYPE_HANDLED;
1077 }
1078
1079 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1080                                       struct trace_event *event)
1081 {
1082         struct ftrace_entry *field;
1083         struct trace_seq *s = &iter->seq;
1084
1085         trace_assign_type(field, iter->ent);
1086
1087         SEQ_PUT_FIELD_RET(s, field->ip);
1088         SEQ_PUT_FIELD_RET(s, field->parent_ip);
1089
1090         return TRACE_TYPE_HANDLED;
1091 }
1092
1093 static struct trace_event_functions trace_fn_funcs = {
1094         .trace          = trace_fn_trace,
1095         .raw            = trace_fn_raw,
1096         .hex            = trace_fn_hex,
1097         .binary         = trace_fn_bin,
1098 };
1099
1100 static struct trace_event trace_fn_event = {
1101         .type           = TRACE_FN,
1102         .funcs          = &trace_fn_funcs,
1103 };
1104
1105 /* TRACE_CTX an TRACE_WAKE */
1106 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1107                                              char *delim)
1108 {
1109         struct ctx_switch_entry *field;
1110         char comm[TASK_COMM_LEN];
1111         int S, T;
1112
1113
1114         trace_assign_type(field, iter->ent);
1115
1116         T = task_state_char(field->next_state);
1117         S = task_state_char(field->prev_state);
1118         trace_find_cmdline(field->next_pid, comm);
1119         if (!trace_seq_printf(&iter->seq,
1120                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1121                               field->prev_pid,
1122                               field->prev_prio,
1123                               S, delim,
1124                               field->next_cpu,
1125                               field->next_pid,
1126                               field->next_prio,
1127                               T, comm))
1128                 return TRACE_TYPE_PARTIAL_LINE;
1129
1130         return TRACE_TYPE_HANDLED;
1131 }
1132
1133 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1134                                          struct trace_event *event)
1135 {
1136         return trace_ctxwake_print(iter, "==>");
1137 }
1138
1139 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1140                                           int flags, struct trace_event *event)
1141 {
1142         return trace_ctxwake_print(iter, "  +");
1143 }
1144
1145 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1146 {
1147         struct ctx_switch_entry *field;
1148         int T;
1149
1150         trace_assign_type(field, iter->ent);
1151
1152         if (!S)
1153                 S = task_state_char(field->prev_state);
1154         T = task_state_char(field->next_state);
1155         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1156                               field->prev_pid,
1157                               field->prev_prio,
1158                               S,
1159                               field->next_cpu,
1160                               field->next_pid,
1161                               field->next_prio,
1162                               T))
1163                 return TRACE_TYPE_PARTIAL_LINE;
1164
1165         return TRACE_TYPE_HANDLED;
1166 }
1167
1168 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1169                                        struct trace_event *event)
1170 {
1171         return trace_ctxwake_raw(iter, 0);
1172 }
1173
1174 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1175                                         struct trace_event *event)
1176 {
1177         return trace_ctxwake_raw(iter, '+');
1178 }
1179
1180
1181 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1182 {
1183         struct ctx_switch_entry *field;
1184         struct trace_seq *s = &iter->seq;
1185         int T;
1186
1187         trace_assign_type(field, iter->ent);
1188
1189         if (!S)
1190                 S = task_state_char(field->prev_state);
1191         T = task_state_char(field->next_state);
1192
1193         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1194         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1195         SEQ_PUT_HEX_FIELD_RET(s, S);
1196         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1197         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1198         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1199         SEQ_PUT_HEX_FIELD_RET(s, T);
1200
1201         return TRACE_TYPE_HANDLED;
1202 }
1203
1204 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1205                                        struct trace_event *event)
1206 {
1207         return trace_ctxwake_hex(iter, 0);
1208 }
1209
1210 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1211                                         struct trace_event *event)
1212 {
1213         return trace_ctxwake_hex(iter, '+');
1214 }
1215
1216 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1217                                            int flags, struct trace_event *event)
1218 {
1219         struct ctx_switch_entry *field;
1220         struct trace_seq *s = &iter->seq;
1221
1222         trace_assign_type(field, iter->ent);
1223
1224         SEQ_PUT_FIELD_RET(s, field->prev_pid);
1225         SEQ_PUT_FIELD_RET(s, field->prev_prio);
1226         SEQ_PUT_FIELD_RET(s, field->prev_state);
1227         SEQ_PUT_FIELD_RET(s, field->next_pid);
1228         SEQ_PUT_FIELD_RET(s, field->next_prio);
1229         SEQ_PUT_FIELD_RET(s, field->next_state);
1230
1231         return TRACE_TYPE_HANDLED;
1232 }
1233
1234 static struct trace_event_functions trace_ctx_funcs = {
1235         .trace          = trace_ctx_print,
1236         .raw            = trace_ctx_raw,
1237         .hex            = trace_ctx_hex,
1238         .binary         = trace_ctxwake_bin,
1239 };
1240
1241 static struct trace_event trace_ctx_event = {
1242         .type           = TRACE_CTX,
1243         .funcs          = &trace_ctx_funcs,
1244 };
1245
1246 static struct trace_event_functions trace_wake_funcs = {
1247         .trace          = trace_wake_print,
1248         .raw            = trace_wake_raw,
1249         .hex            = trace_wake_hex,
1250         .binary         = trace_ctxwake_bin,
1251 };
1252
1253 static struct trace_event trace_wake_event = {
1254         .type           = TRACE_WAKE,
1255         .funcs          = &trace_wake_funcs,
1256 };
1257
1258 /* TRACE_STACK */
1259
1260 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1261                                            int flags, struct trace_event *event)
1262 {
1263         struct stack_entry *field;
1264         struct trace_seq *s = &iter->seq;
1265         unsigned long *p;
1266         unsigned long *end;
1267
1268         trace_assign_type(field, iter->ent);
1269         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1270
1271         if (!trace_seq_puts(s, "<stack trace>\n"))
1272                 goto partial;
1273
1274         for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1275                 if (!trace_seq_puts(s, " => "))
1276                         goto partial;
1277
1278                 if (!seq_print_ip_sym(s, *p, flags))
1279                         goto partial;
1280                 if (!trace_seq_putc(s, '\n'))
1281                         goto partial;
1282         }
1283
1284         return TRACE_TYPE_HANDLED;
1285
1286  partial:
1287         return TRACE_TYPE_PARTIAL_LINE;
1288 }
1289
1290 static struct trace_event_functions trace_stack_funcs = {
1291         .trace          = trace_stack_print,
1292 };
1293
1294 static struct trace_event trace_stack_event = {
1295         .type           = TRACE_STACK,
1296         .funcs          = &trace_stack_funcs,
1297 };
1298
1299 /* TRACE_USER_STACK */
1300 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1301                                                 int flags, struct trace_event *event)
1302 {
1303         struct userstack_entry *field;
1304         struct trace_seq *s = &iter->seq;
1305
1306         trace_assign_type(field, iter->ent);
1307
1308         if (!trace_seq_puts(s, "<user stack trace>\n"))
1309                 goto partial;
1310
1311         if (!seq_print_userip_objs(field, s, flags))
1312                 goto partial;
1313
1314         return TRACE_TYPE_HANDLED;
1315
1316  partial:
1317         return TRACE_TYPE_PARTIAL_LINE;
1318 }
1319
1320 static struct trace_event_functions trace_user_stack_funcs = {
1321         .trace          = trace_user_stack_print,
1322 };
1323
1324 static struct trace_event trace_user_stack_event = {
1325         .type           = TRACE_USER_STACK,
1326         .funcs          = &trace_user_stack_funcs,
1327 };
1328
1329 /* TRACE_BPUTS */
1330 static enum print_line_t
1331 trace_bputs_print(struct trace_iterator *iter, int flags,
1332                    struct trace_event *event)
1333 {
1334         struct trace_entry *entry = iter->ent;
1335         struct trace_seq *s = &iter->seq;
1336         struct bputs_entry *field;
1337
1338         trace_assign_type(field, entry);
1339
1340         if (!seq_print_ip_sym(s, field->ip, flags))
1341                 goto partial;
1342
1343         if (!trace_seq_puts(s, ": "))
1344                 goto partial;
1345
1346         if (!trace_seq_puts(s, field->str))
1347                 goto partial;
1348
1349         return TRACE_TYPE_HANDLED;
1350
1351  partial:
1352         return TRACE_TYPE_PARTIAL_LINE;
1353 }
1354
1355
1356 static enum print_line_t
1357 trace_bputs_raw(struct trace_iterator *iter, int flags,
1358                 struct trace_event *event)
1359 {
1360         struct bputs_entry *field;
1361         struct trace_seq *s = &iter->seq;
1362
1363         trace_assign_type(field, iter->ent);
1364
1365         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1366                 goto partial;
1367
1368         if (!trace_seq_puts(s, field->str))
1369                 goto partial;
1370
1371         return TRACE_TYPE_HANDLED;
1372
1373  partial:
1374         return TRACE_TYPE_PARTIAL_LINE;
1375 }
1376
1377 static struct trace_event_functions trace_bputs_funcs = {
1378         .trace          = trace_bputs_print,
1379         .raw            = trace_bputs_raw,
1380 };
1381
1382 static struct trace_event trace_bputs_event = {
1383         .type           = TRACE_BPUTS,
1384         .funcs          = &trace_bputs_funcs,
1385 };
1386
1387 /* TRACE_BPRINT */
1388 static enum print_line_t
1389 trace_bprint_print(struct trace_iterator *iter, int flags,
1390                    struct trace_event *event)
1391 {
1392         struct trace_entry *entry = iter->ent;
1393         struct trace_seq *s = &iter->seq;
1394         struct bprint_entry *field;
1395
1396         trace_assign_type(field, entry);
1397
1398         if (!seq_print_ip_sym(s, field->ip, flags))
1399                 goto partial;
1400
1401         if (!trace_seq_puts(s, ": "))
1402                 goto partial;
1403
1404         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1405                 goto partial;
1406
1407         return TRACE_TYPE_HANDLED;
1408
1409  partial:
1410         return TRACE_TYPE_PARTIAL_LINE;
1411 }
1412
1413
1414 static enum print_line_t
1415 trace_bprint_raw(struct trace_iterator *iter, int flags,
1416                  struct trace_event *event)
1417 {
1418         struct bprint_entry *field;
1419         struct trace_seq *s = &iter->seq;
1420
1421         trace_assign_type(field, iter->ent);
1422
1423         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1424                 goto partial;
1425
1426         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1427                 goto partial;
1428
1429         return TRACE_TYPE_HANDLED;
1430
1431  partial:
1432         return TRACE_TYPE_PARTIAL_LINE;
1433 }
1434
1435 static struct trace_event_functions trace_bprint_funcs = {
1436         .trace          = trace_bprint_print,
1437         .raw            = trace_bprint_raw,
1438 };
1439
1440 static struct trace_event trace_bprint_event = {
1441         .type           = TRACE_BPRINT,
1442         .funcs          = &trace_bprint_funcs,
1443 };
1444
1445 /* TRACE_PRINT */
1446 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1447                                            int flags, struct trace_event *event)
1448 {
1449         struct print_entry *field;
1450         struct trace_seq *s = &iter->seq;
1451
1452         trace_assign_type(field, iter->ent);
1453
1454         if (!seq_print_ip_sym(s, field->ip, flags))
1455                 goto partial;
1456
1457         if (!trace_seq_printf(s, ": %s", field->buf))
1458                 goto partial;
1459
1460         return TRACE_TYPE_HANDLED;
1461
1462  partial:
1463         return TRACE_TYPE_PARTIAL_LINE;
1464 }
1465
1466 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1467                                          struct trace_event *event)
1468 {
1469         struct print_entry *field;
1470
1471         trace_assign_type(field, iter->ent);
1472
1473         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1474                 goto partial;
1475
1476         return TRACE_TYPE_HANDLED;
1477
1478  partial:
1479         return TRACE_TYPE_PARTIAL_LINE;
1480 }
1481
1482 static struct trace_event_functions trace_print_funcs = {
1483         .trace          = trace_print_print,
1484         .raw            = trace_print_raw,
1485 };
1486
1487 static struct trace_event trace_print_event = {
1488         .type           = TRACE_PRINT,
1489         .funcs          = &trace_print_funcs,
1490 };
1491
1492
1493 static struct trace_event *events[] __initdata = {
1494         &trace_fn_event,
1495         &trace_ctx_event,
1496         &trace_wake_event,
1497         &trace_stack_event,
1498         &trace_user_stack_event,
1499         &trace_bputs_event,
1500         &trace_bprint_event,
1501         &trace_print_event,
1502         NULL
1503 };
1504
1505 __init static int init_events(void)
1506 {
1507         struct trace_event *event;
1508         int i, ret;
1509
1510         for (i = 0; events[i]; i++) {
1511                 event = events[i];
1512
1513                 ret = register_ftrace_event(event);
1514                 if (!ret) {
1515                         printk(KERN_WARNING "event %d failed to register\n",
1516                                event->type);
1517                         WARN_ON_ONCE(1);
1518                 }
1519         }
1520
1521         return 0;
1522 }
1523 early_initcall(init_events);