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 int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  24 {
  25         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  26         int ret;
  27
  28         ret = seq_write(m, s->buffer, len);
  29
  30         /*
  31          * Only reset this buffer if we successfully wrote to the
  32          * seq_file buffer.
  33          */
  34         if (!ret)
  35                 trace_seq_init(s);
  36
  37         return ret;
  38 }
  39
  40 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
  41 {
  42         struct trace_seq *s = &iter->seq;
  43         struct trace_entry *entry = iter->ent;
  44         struct bputs_entry *field;
  45         int ret;
  46
  47         trace_assign_type(field, entry);
  48
  49         ret = trace_seq_puts(s, field->str);
  50         if (!ret)
  51                 return TRACE_TYPE_PARTIAL_LINE;
  52
  53         return TRACE_TYPE_HANDLED;
  54 }
  55
  56 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  57 {
  58         struct trace_seq *s = &iter->seq;
  59         struct trace_entry *entry = iter->ent;
  60         struct bprint_entry *field;
  61         int ret;
  62
  63         trace_assign_type(field, entry);
  64
  65         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  66         if (!ret)
  67                 return TRACE_TYPE_PARTIAL_LINE;
  68
  69         return TRACE_TYPE_HANDLED;
  70 }
  71
  72 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  73 {
  74         struct trace_seq *s = &iter->seq;
  75         struct trace_entry *entry = iter->ent;
  76         struct print_entry *field;
  77         int ret;
  78
  79         trace_assign_type(field, entry);
  80
  81         ret = trace_seq_puts(s, field->buf);
  82         if (!ret)
  83                 return TRACE_TYPE_PARTIAL_LINE;
  84
  85         return TRACE_TYPE_HANDLED;
  86 }
  87
  88 /**
  89  * trace_seq_printf - sequence printing of trace information
  90  * @s: trace sequence descriptor
  91  * @fmt: printf format string
  92  *
  93  * It returns 0 if the trace oversizes the buffer's free
  94  * space, 1 otherwise.
  95  *
  96  * The tracer may use either sequence operations or its own
  97  * copy to user routines. To simplify formating of a trace
  98  * trace_seq_printf is used to store strings into a special
  99  * buffer (@s). Then the output may be either used by
 100  * the sequencer or pulled into another buffer.
 101  */
 102 int
 103 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 104 {
 105         int len = (PAGE_SIZE - 1) - s->len;
 106         va_list ap;
 107         int ret;
 108
 109         if (s->full || !len)
 110                 return 0;
 111
 112         va_start(ap, fmt);
 113         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
 114         va_end(ap);
 115
 116         /* If we can't write it all, don't bother writing anything */
 117         if (ret >= len) {
 118                 s->full = 1;
 119                 return 0;
 120         }
 121
 122         s->len += ret;
 123
 124         return 1;
 125 }
 126 EXPORT_SYMBOL_GPL(trace_seq_printf);
 127
 128 /**
 129  * trace_seq_bitmask - put a list of longs as a bitmask print output
 130  * @s:          trace sequence descriptor
 131  * @maskp:      points to an array of unsigned longs that represent a bitmask
 132  * @nmaskbits:  The number of bits that are valid in @maskp
 133  *
 134  * It returns 0 if the trace oversizes the buffer's free
 135  * space, 1 otherwise.
 136  *
 137  * Writes a ASCII representation of a bitmask string into @s.
 138  */
 139 int
 140 trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp,
 141                   int nmaskbits)
 142 {
 143         int len = (PAGE_SIZE - 1) - s->len;
 144         int ret;
 145
 146         if (s->full || !len)
 147                 return 0;
 148
 149         ret = bitmap_scnprintf(s->buffer, len, maskp, nmaskbits);
 150         s->len += ret;
 151
 152         return 1;
 153 }
 154 EXPORT_SYMBOL_GPL(trace_seq_bitmask);
 155
 156 /**
 157  * trace_seq_vprintf - sequence printing of trace information
 158  * @s: trace sequence descriptor
 159  * @fmt: printf format string
 160  *
 161  * The tracer may use either sequence operations or its own
 162  * copy to user routines. To simplify formating of a trace
 163  * trace_seq_printf is used to store strings into a special
 164  * buffer (@s). Then the output may be either used by
 165  * the sequencer or pulled into another buffer.
 166  */
 167 int
 168 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 169 {
 170         int len = (PAGE_SIZE - 1) - s->len;
 171         int ret;
 172
 173         if (s->full || !len)
 174                 return 0;
 175
 176         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 177
 178         /* If we can't write it all, don't bother writing anything */
 179         if (ret >= len) {
 180                 s->full = 1;
 181                 return 0;
 182         }
 183
 184         s->len += ret;
 185
 186         return len;
 187 }
 188 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 189
 190 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 191 {
 192         int len = (PAGE_SIZE - 1) - s->len;
 193         int ret;
 194
 195         if (s->full || !len)
 196                 return 0;
 197
 198         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 199
 200         /* If we can't write it all, don't bother writing anything */
 201         if (ret >= len) {
 202                 s->full = 1;
 203                 return 0;
 204         }
 205
 206         s->len += ret;
 207
 208         return len;
 209 }
 210
 211 /**
 212  * trace_seq_puts - trace sequence printing of simple string
 213  * @s: trace sequence descriptor
 214  * @str: simple string to record
 215  *
 216  * The tracer may use either the sequence operations or its own
 217  * copy to user routines. This function records a simple string
 218  * into a special buffer (@s) for later retrieval by a sequencer
 219  * or other mechanism.
 220  */
 221 int trace_seq_puts(struct trace_seq *s, const char *str)
 222 {
 223         int len = strlen(str);
 224
 225         if (s->full)
 226                 return 0;
 227
 228         if (len > ((PAGE_SIZE - 1) - s->len)) {
 229                 s->full = 1;
 230                 return 0;
 231         }
 232
 233         memcpy(s->buffer + s->len, str, len);
 234         s->len += len;
 235
 236         return len;
 237 }
 238
 239 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 240 {
 241         if (s->full)
 242                 return 0;
 243
 244         if (s->len >= (PAGE_SIZE - 1)) {
 245                 s->full = 1;
 246                 return 0;
 247         }
 248
 249         s->buffer[s->len++] = c;
 250
 251         return 1;
 252 }
 253 EXPORT_SYMBOL(trace_seq_putc);
 254
 255 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 256 {
 257         if (s->full)
 258                 return 0;
 259
 260         if (len > ((PAGE_SIZE - 1) - s->len)) {
 261                 s->full = 1;
 262                 return 0;
 263         }
 264
 265         memcpy(s->buffer + s->len, mem, len);
 266         s->len += len;
 267
 268         return len;
 269 }
 270
 271 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 272 {
 273         unsigned char hex[HEX_CHARS];
 274         const unsigned char *data = mem;
 275         int i, j;
 276
 277         if (s->full)
 278                 return 0;
 279
 280 #ifdef __BIG_ENDIAN
 281         for (i = 0, j = 0; i < len; i++) {
 282 #else
 283         for (i = len-1, j = 0; i >= 0; i--) {
 284 #endif
 285                 hex[j++] = hex_asc_hi(data[i]);
 286                 hex[j++] = hex_asc_lo(data[i]);
 287         }
 288         hex[j++] = ' ';
 289
 290         return trace_seq_putmem(s, hex, j);
 291 }
 292
 293 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 294 {
 295         void *ret;
 296
 297         if (s->full)
 298                 return NULL;
 299
 300         if (len > ((PAGE_SIZE - 1) - s->len)) {
 301                 s->full = 1;
 302                 return NULL;
 303         }
 304
 305         ret = s->buffer + s->len;
 306         s->len += len;
 307
 308         return ret;
 309 }
 310
 311 int trace_seq_path(struct trace_seq *s, const struct path *path)
 312 {
 313         unsigned char *p;
 314
 315         if (s->full)
 316                 return 0;
 317
 318         if (s->len >= (PAGE_SIZE - 1)) {
 319                 s->full = 1;
 320                 return 0;
 321         }
 322
 323         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 324         if (!IS_ERR(p)) {
 325                 p = mangle_path(s->buffer + s->len, p, "\n");
 326                 if (p) {
 327                         s->len = p - s->buffer;
 328                         return 1;
 329                 }
 330         } else {
 331                 s->buffer[s->len++] = '?';
 332                 return 1;
 333         }
 334
 335         s->full = 1;
 336         return 0;
 337 }
 338
 339 const char *
 340 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 341                        unsigned long flags,
 342                        const struct trace_print_flags *flag_array)
 343 {
 344         unsigned long mask;
 345         const char *str;
 346         const char *ret = p->buffer + p->len;
 347         int i, first = 1;
 348
 349         for (i = 0;  flag_array[i].name && flags; i++) {
 350
 351                 mask = flag_array[i].mask;
 352                 if ((flags & mask) != mask)
 353                         continue;
 354
 355                 str = flag_array[i].name;
 356                 flags &= ~mask;
 357                 if (!first && delim)
 358                         trace_seq_puts(p, delim);
 359                 else
 360                         first = 0;
 361                 trace_seq_puts(p, str);
 362         }
 363
 364         /* check for left over flags */
 365         if (flags) {
 366                 if (!first && delim)
 367                         trace_seq_puts(p, delim);
 368                 trace_seq_printf(p, "0x%lx", flags);
 369         }
 370
 371         trace_seq_putc(p, 0);
 372
 373         return ret;
 374 }
 375 EXPORT_SYMBOL(ftrace_print_flags_seq);
 376
 377 const char *
 378 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 379                          const struct trace_print_flags *symbol_array)
 380 {
 381         int i;
 382         const char *ret = p->buffer + p->len;
 383
 384         for (i = 0;  symbol_array[i].name; i++) {
 385
 386                 if (val != symbol_array[i].mask)
 387                         continue;
 388
 389                 trace_seq_puts(p, symbol_array[i].name);
 390                 break;
 391         }
 392
 393         if (ret == (const char *)(p->buffer + p->len))
 394                 trace_seq_printf(p, "0x%lx", val);
 395
 396         trace_seq_putc(p, 0);
 397
 398         return ret;
 399 }
 400 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 401
 402 #if BITS_PER_LONG == 32
 403 const char *
 404 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 405                          const struct trace_print_flags_u64 *symbol_array)
 406 {
 407         int i;
 408         const char *ret = p->buffer + p->len;
 409
 410         for (i = 0;  symbol_array[i].name; i++) {
 411
 412                 if (val != symbol_array[i].mask)
 413                         continue;
 414
 415                 trace_seq_puts(p, symbol_array[i].name);
 416                 break;
 417         }
 418
 419         if (ret == (const char *)(p->buffer + p->len))
 420                 trace_seq_printf(p, "0x%llx", val);
 421
 422         trace_seq_putc(p, 0);
 423
 424         return ret;
 425 }
 426 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
 427 #endif
 428
 429 const char *
 430 ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
 431                          unsigned int bitmask_size)
 432 {
 433         const char *ret = p->buffer + p->len;
 434
 435         trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
 436         trace_seq_putc(p, 0);
 437
 438         return ret;
 439 }
 440 EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
 441
 442 const char *
 443 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 444 {
 445         int i;
 446         const char *ret = p->buffer + p->len;
 447
 448         for (i = 0; i < buf_len; i++)
 449                 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
 450
 451         trace_seq_putc(p, 0);
 452
 453         return ret;
 454 }
 455 EXPORT_SYMBOL(ftrace_print_hex_seq);
 456
 457 int ftrace_raw_output_prep(struct trace_iterator *iter,
 458                            struct trace_event *trace_event)
 459 {
 460         struct ftrace_event_call *event;
 461         struct trace_seq *s = &iter->seq;
 462         struct trace_seq *p = &iter->tmp_seq;
 463         struct trace_entry *entry;
 464         int ret;
 465
 466         event = container_of(trace_event, struct ftrace_event_call, event);
 467         entry = iter->ent;
 468
 469         if (entry->type != event->event.type) {
 470                 WARN_ON_ONCE(1);
 471                 return TRACE_TYPE_UNHANDLED;
 472         }
 473
 474         trace_seq_init(p);
 475         ret = trace_seq_printf(s, "%s: ", ftrace_event_name(event));
 476         if (!ret)
 477                 return TRACE_TYPE_PARTIAL_LINE;
 478
 479         return 0;
 480 }
 481 EXPORT_SYMBOL(ftrace_raw_output_prep);
 482
 483 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
 484                              char *fmt, va_list ap)
 485 {
 486         struct trace_seq *s = &iter->seq;
 487         int ret;
 488
 489         ret = trace_seq_printf(s, "%s: ", name);
 490         if (!ret)
 491                 return TRACE_TYPE_PARTIAL_LINE;
 492
 493         ret = trace_seq_vprintf(s, fmt, ap);
 494
 495         if (!ret)
 496                 return TRACE_TYPE_PARTIAL_LINE;
 497
 498         return TRACE_TYPE_HANDLED;
 499 }
 500
 501 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 502 {
 503         va_list ap;
 504         int ret;
 505
 506         va_start(ap, fmt);
 507         ret = ftrace_output_raw(iter, name, fmt, ap);
 508         va_end(ap);
 509
 510         return ret;
 511 }
 512 EXPORT_SYMBOL_GPL(ftrace_output_call);
 513
 514 #ifdef CONFIG_KRETPROBES
 515 static inline const char *kretprobed(const char *name)
 516 {
 517         static const char tramp_name[] = "kretprobe_trampoline";
 518         int size = sizeof(tramp_name);
 519
 520         if (strncmp(tramp_name, name, size) == 0)
 521                 return "[unknown/kretprobe'd]";
 522         return name;
 523 }
 524 #else
 525 static inline const char *kretprobed(const char *name)
 526 {
 527         return name;
 528 }
 529 #endif /* CONFIG_KRETPROBES */
 530
 531 static int
 532 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 533 {
 534 #ifdef CONFIG_KALLSYMS
 535         char str[KSYM_SYMBOL_LEN];
 536         const char *name;
 537
 538         kallsyms_lookup(address, NULL, NULL, NULL, str);
 539
 540         name = kretprobed(str);
 541
 542         return trace_seq_printf(s, fmt, name);
 543 #endif
 544         return 1;
 545 }
 546
 547 static int
 548 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 549                      unsigned long address)
 550 {
 551 #ifdef CONFIG_KALLSYMS
 552         char str[KSYM_SYMBOL_LEN];
 553         const char *name;
 554
 555         sprint_symbol(str, address);
 556         name = kretprobed(str);
 557
 558         return trace_seq_printf(s, fmt, name);
 559 #endif
 560         return 1;
 561 }
 562
 563 #ifndef CONFIG_64BIT
 564 # define IP_FMT "%08lx"
 565 #else
 566 # define IP_FMT "%016lx"
 567 #endif
 568
 569 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 570                       unsigned long ip, unsigned long sym_flags)
 571 {
 572         struct file *file = NULL;
 573         unsigned long vmstart = 0;
 574         int ret = 1;
 575
 576         if (s->full)
 577                 return 0;
 578
 579         if (mm) {
 580                 const struct vm_area_struct *vma;
 581
 582                 down_read(&mm->mmap_sem);
 583                 vma = find_vma(mm, ip);
 584                 if (vma) {
 585                         file = vma->vm_file;
 586                         vmstart = vma->vm_start;
 587                 }
 588                 if (file) {
 589                         ret = trace_seq_path(s, &file->f_path);
 590                         if (ret)
 591                                 ret = trace_seq_printf(s, "[+0x%lx]",
 592                                                        ip - vmstart);
 593                 }
 594                 up_read(&mm->mmap_sem);
 595         }
 596         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 597                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 598         return ret;
 599 }
 600
 601 int
 602 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 603                       unsigned long sym_flags)
 604 {
 605         struct mm_struct *mm = NULL;
 606         int ret = 1;
 607         unsigned int i;
 608
 609         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 610                 struct task_struct *task;
 611                 /*
 612                  * we do the lookup on the thread group leader,
 613                  * since individual threads might have already quit!
 614                  */
 615                 rcu_read_lock();
 616                 task = find_task_by_vpid(entry->tgid);
 617                 if (task)
 618                         mm = get_task_mm(task);
 619                 rcu_read_unlock();
 620         }
 621
 622         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 623                 unsigned long ip = entry->caller[i];
 624
 625                 if (ip == ULONG_MAX || !ret)
 626                         break;
 627                 if (ret)
 628                         ret = trace_seq_puts(s, " => ");
 629                 if (!ip) {
 630                         if (ret)
 631                                 ret = trace_seq_puts(s, "??");
 632                         if (ret)
 633                                 ret = trace_seq_putc(s, '\n');
 634                         continue;
 635                 }
 636                 if (!ret)
 637                         break;
 638                 if (ret)
 639                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 640                 ret = trace_seq_putc(s, '\n');
 641         }
 642
 643         if (mm)
 644                 mmput(mm);
 645         return ret;
 646 }
 647
 648 int
 649 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 650 {
 651         int ret;
 652
 653         if (!ip)
 654                 return trace_seq_putc(s, '0');
 655
 656         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 657                 ret = seq_print_sym_offset(s, "%s", ip);
 658         else
 659                 ret = seq_print_sym_short(s, "%s", ip);
 660
 661         if (!ret)
 662                 return 0;
 663
 664         if (sym_flags & TRACE_ITER_SYM_ADDR)
 665                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 666         return ret;
 667 }
 668
 669 /**
 670  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 671  * @s: trace seq struct to write to
 672  * @entry: The trace entry field from the ring buffer
 673  *
 674  * Prints the generic fields of irqs off, in hard or softirq, preempt
 675  * count.
 676  */
 677 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 678 {
 679         char hardsoft_irq;
 680         char need_resched;
 681         char irqs_off;
 682         int hardirq;
 683         int softirq;
 684         int ret;
 685
 686         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 687         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 688
 689         irqs_off =
 690                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 691                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 692                 '.';
 693
 694         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 695                                 TRACE_FLAG_PREEMPT_RESCHED)) {
 696         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 697                 need_resched = 'N';
 698                 break;
 699         case TRACE_FLAG_NEED_RESCHED:
 700                 need_resched = 'n';
 701                 break;
 702         case TRACE_FLAG_PREEMPT_RESCHED:
 703                 need_resched = 'p';
 704                 break;
 705         default:
 706                 need_resched = '.';
 707                 break;
 708         }
 709
 710         hardsoft_irq =
 711                 (hardirq && softirq) ? 'H' :
 712                 hardirq ? 'h' :
 713                 softirq ? 's' :
 714                 '.';
 715
 716         if (!trace_seq_printf(s, "%c%c%c",
 717                               irqs_off, need_resched, hardsoft_irq))
 718                 return 0;
 719
 720         if (entry->preempt_count)
 721                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
 722         else
 723                 ret = trace_seq_putc(s, '.');
 724
 725         return ret;
 726 }
 727
 728 static int
 729 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 730 {
 731         char comm[TASK_COMM_LEN];
 732
 733         trace_find_cmdline(entry->pid, comm);
 734
 735         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 736                               comm, entry->pid, cpu))
 737                 return 0;
 738
 739         return trace_print_lat_fmt(s, entry);
 740 }
 741
 742 static unsigned long preempt_mark_thresh_us = 100;
 743
 744 static int
 745 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 746 {
 747         unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
 748         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 749         unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 750         unsigned long long rel_ts = next_ts - iter->ts;
 751         struct trace_seq *s = &iter->seq;
 752
 753         if (in_ns) {
 754                 abs_ts = ns2usecs(abs_ts);
 755                 rel_ts = ns2usecs(rel_ts);
 756         }
 757
 758         if (verbose && in_ns) {
 759                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 760                 unsigned long abs_msec = (unsigned long)abs_ts;
 761                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 762                 unsigned long rel_msec = (unsigned long)rel_ts;
 763
 764                 return trace_seq_printf(
 765                                 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 766                                 ns2usecs(iter->ts),
 767                                 abs_msec, abs_usec,
 768                                 rel_msec, rel_usec);
 769         } else if (verbose && !in_ns) {
 770                 return trace_seq_printf(
 771                                 s, "[%016llx] %lld (+%lld): ",
 772                                 iter->ts, abs_ts, rel_ts);
 773         } else if (!verbose && in_ns) {
 774                 return trace_seq_printf(
 775                                 s, " %4lldus%c: ",
 776                                 abs_ts,
 777                                 rel_ts > preempt_mark_thresh_us ? '!' :
 778                                   rel_ts > 1 ? '+' : ' ');
 779         } else { /* !verbose && !in_ns */
 780                 return trace_seq_printf(s, " %4lld: ", abs_ts);
 781         }
 782 }
 783
 784 int trace_print_context(struct trace_iterator *iter)
 785 {
 786         struct trace_seq *s = &iter->seq;
 787         struct trace_entry *entry = iter->ent;
 788         unsigned long long t;
 789         unsigned long secs, usec_rem;
 790         char comm[TASK_COMM_LEN];
 791         int ret;
 792
 793         trace_find_cmdline(entry->pid, comm);
 794
 795         ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
 796                                comm, entry->pid, iter->cpu);
 797         if (!ret)
 798                 return 0;
 799
 800         if (trace_flags & TRACE_ITER_IRQ_INFO) {
 801                 ret = trace_print_lat_fmt(s, entry);
 802                 if (!ret)
 803                         return 0;
 804         }
 805
 806         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 807                 t = ns2usecs(iter->ts);
 808                 usec_rem = do_div(t, USEC_PER_SEC);
 809                 secs = (unsigned long)t;
 810                 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
 811         } else
 812                 return trace_seq_printf(s, " %12llu: ", iter->ts);
 813 }
 814
 815 int trace_print_lat_context(struct trace_iterator *iter)
 816 {
 817         u64 next_ts;
 818         int ret;
 819         /* trace_find_next_entry will reset ent_size */
 820         int ent_size = iter->ent_size;
 821         struct trace_seq *s = &iter->seq;
 822         struct trace_entry *entry = iter->ent,
 823                            *next_entry = trace_find_next_entry(iter, NULL,
 824                                                                &next_ts);
 825         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 826
 827         /* Restore the original ent_size */
 828         iter->ent_size = ent_size;
 829
 830         if (!next_entry)
 831                 next_ts = iter->ts;
 832
 833         if (verbose) {
 834                 char comm[TASK_COMM_LEN];
 835
 836                 trace_find_cmdline(entry->pid, comm);
 837
 838                 ret = trace_seq_printf(
 839                                 s, "%16s %5d %3d %d %08x %08lx ",
 840                                 comm, entry->pid, iter->cpu, entry->flags,
 841                                 entry->preempt_count, iter->idx);
 842         } else {
 843                 ret = lat_print_generic(s, entry, iter->cpu);
 844         }
 845
 846         if (ret)
 847                 ret = lat_print_timestamp(iter, next_ts);
 848
 849         return ret;
 850 }
 851
 852 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 853
 854 static int task_state_char(unsigned long state)
 855 {
 856         int bit = state ? __ffs(state) + 1 : 0;
 857
 858         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 859 }
 860
 861 /**
 862  * ftrace_find_event - find a registered event
 863  * @type: the type of event to look for
 864  *
 865  * Returns an event of type @type otherwise NULL
 866  * Called with trace_event_read_lock() held.
 867  */
 868 struct trace_event *ftrace_find_event(int type)
 869 {
 870         struct trace_event *event;
 871         unsigned key;
 872
 873         key = type & (EVENT_HASHSIZE - 1);
 874
 875         hlist_for_each_entry(event, &event_hash[key], node) {
 876                 if (event->type == type)
 877                         return event;
 878         }
 879
 880         return NULL;
 881 }
 882
 883 static LIST_HEAD(ftrace_event_list);
 884
 885 static int trace_search_list(struct list_head **list)
 886 {
 887         struct trace_event *e;
 888         int last = __TRACE_LAST_TYPE;
 889
 890         if (list_empty(&ftrace_event_list)) {
 891                 *list = &ftrace_event_list;
 892                 return last + 1;
 893         }
 894
 895         /*
 896          * We used up all possible max events,
 897          * lets see if somebody freed one.
 898          */
 899         list_for_each_entry(e, &ftrace_event_list, list) {
 900                 if (e->type != last + 1)
 901                         break;
 902                 last++;
 903         }
 904
 905         /* Did we used up all 65 thousand events??? */
 906         if ((last + 1) > FTRACE_MAX_EVENT)
 907                 return 0;
 908
 909         *list = &e->list;
 910         return last + 1;
 911 }
 912
 913 void trace_event_read_lock(void)
 914 {
 915         down_read(&trace_event_sem);
 916 }
 917
 918 void trace_event_read_unlock(void)
 919 {
 920         up_read(&trace_event_sem);
 921 }
 922
 923 /**
 924  * register_ftrace_event - register output for an event type
 925  * @event: the event type to register
 926  *
 927  * Event types are stored in a hash and this hash is used to
 928  * find a way to print an event. If the @event->type is set
 929  * then it will use that type, otherwise it will assign a
 930  * type to use.
 931  *
 932  * If you assign your own type, please make sure it is added
 933  * to the trace_type enum in trace.h, to avoid collisions
 934  * with the dynamic types.
 935  *
 936  * Returns the event type number or zero on error.
 937  */
 938 int register_ftrace_event(struct trace_event *event)
 939 {
 940         unsigned key;
 941         int ret = 0;
 942
 943         down_write(&trace_event_sem);
 944
 945         if (WARN_ON(!event))
 946                 goto out;
 947
 948         if (WARN_ON(!event->funcs))
 949                 goto out;
 950
 951         INIT_LIST_HEAD(&event->list);
 952
 953         if (!event->type) {
 954                 struct list_head *list = NULL;
 955
 956                 if (next_event_type > FTRACE_MAX_EVENT) {
 957
 958                         event->type = trace_search_list(&list);
 959                         if (!event->type)
 960                                 goto out;
 961
 962                 } else {
 963
 964                         event->type = next_event_type++;
 965                         list = &ftrace_event_list;
 966                 }
 967
 968                 if (WARN_ON(ftrace_find_event(event->type)))
 969                         goto out;
 970
 971                 list_add_tail(&event->list, list);
 972
 973         } else if (event->type > __TRACE_LAST_TYPE) {
 974                 printk(KERN_WARNING "Need to add type to trace.h\n");
 975                 WARN_ON(1);
 976                 goto out;
 977         } else {
 978                 /* Is this event already used */
 979                 if (ftrace_find_event(event->type))
 980                         goto out;
 981         }
 982
 983         if (event->funcs->trace == NULL)
 984                 event->funcs->trace = trace_nop_print;
 985         if (event->funcs->raw == NULL)
 986                 event->funcs->raw = trace_nop_print;
 987         if (event->funcs->hex == NULL)
 988                 event->funcs->hex = trace_nop_print;
 989         if (event->funcs->binary == NULL)
 990                 event->funcs->binary = trace_nop_print;
 991
 992         key = event->type & (EVENT_HASHSIZE - 1);
 993
 994         hlist_add_head(&event->node, &event_hash[key]);
 995
 996         ret = event->type;
 997  out:
 998         up_write(&trace_event_sem);
 999
1000         return ret;
1001 }
1002 EXPORT_SYMBOL_GPL(register_ftrace_event);
1003
1004 /*
1005  * Used by module code with the trace_event_sem held for write.
1006  */
1007 int __unregister_ftrace_event(struct trace_event *event)
1008 {
1009         hlist_del(&event->node);
1010         list_del(&event->list);
1011         return 0;
1012 }
1013
1014 /**
1015  * unregister_ftrace_event - remove a no longer used event
1016  * @event: the event to remove
1017  */
1018 int unregister_ftrace_event(struct trace_event *event)
1019 {
1020         down_write(&trace_event_sem);
1021         __unregister_ftrace_event(event);
1022         up_write(&trace_event_sem);
1023
1024         return 0;
1025 }
1026 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
1027
1028 /*
1029  * Standard events
1030  */
1031
1032 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
1033                                   struct trace_event *event)
1034 {
1035         if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
1036                 return TRACE_TYPE_PARTIAL_LINE;
1037
1038         return TRACE_TYPE_HANDLED;
1039 }
1040
1041 /* TRACE_FN */
1042 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1043                                         struct trace_event *event)
1044 {
1045         struct ftrace_entry *field;
1046         struct trace_seq *s = &iter->seq;
1047
1048         trace_assign_type(field, iter->ent);
1049
1050         if (!seq_print_ip_sym(s, field->ip, flags))
1051                 goto partial;
1052
1053         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
1054                 if (!trace_seq_puts(s, " <-"))
1055                         goto partial;
1056                 if (!seq_print_ip_sym(s,
1057                                       field->parent_ip,
1058                                       flags))
1059                         goto partial;
1060         }
1061         if (!trace_seq_putc(s, '\n'))
1062                 goto partial;
1063
1064         return TRACE_TYPE_HANDLED;
1065
1066  partial:
1067         return TRACE_TYPE_PARTIAL_LINE;
1068 }
1069
1070 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1071                                       struct trace_event *event)
1072 {
1073         struct ftrace_entry *field;
1074
1075         trace_assign_type(field, iter->ent);
1076
1077         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
1078                               field->ip,
1079                               field->parent_ip))
1080                 return TRACE_TYPE_PARTIAL_LINE;
1081
1082         return TRACE_TYPE_HANDLED;
1083 }
1084
1085 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1086                                       struct trace_event *event)
1087 {
1088         struct ftrace_entry *field;
1089         struct trace_seq *s = &iter->seq;
1090
1091         trace_assign_type(field, iter->ent);
1092
1093         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
1094         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
1095
1096         return TRACE_TYPE_HANDLED;
1097 }
1098
1099 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1100                                       struct trace_event *event)
1101 {
1102         struct ftrace_entry *field;
1103         struct trace_seq *s = &iter->seq;
1104
1105         trace_assign_type(field, iter->ent);
1106
1107         SEQ_PUT_FIELD_RET(s, field->ip);
1108         SEQ_PUT_FIELD_RET(s, field->parent_ip);
1109
1110         return TRACE_TYPE_HANDLED;
1111 }
1112
1113 static struct trace_event_functions trace_fn_funcs = {
1114         .trace          = trace_fn_trace,
1115         .raw            = trace_fn_raw,
1116         .hex            = trace_fn_hex,
1117         .binary         = trace_fn_bin,
1118 };
1119
1120 static struct trace_event trace_fn_event = {
1121         .type           = TRACE_FN,
1122         .funcs          = &trace_fn_funcs,
1123 };
1124
1125 /* TRACE_CTX an TRACE_WAKE */
1126 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1127                                              char *delim)
1128 {
1129         struct ctx_switch_entry *field;
1130         char comm[TASK_COMM_LEN];
1131         int S, T;
1132
1133
1134         trace_assign_type(field, iter->ent);
1135
1136         T = task_state_char(field->next_state);
1137         S = task_state_char(field->prev_state);
1138         trace_find_cmdline(field->next_pid, comm);
1139         if (!trace_seq_printf(&iter->seq,
1140                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1141                               field->prev_pid,
1142                               field->prev_prio,
1143                               S, delim,
1144                               field->next_cpu,
1145                               field->next_pid,
1146                               field->next_prio,
1147                               T, comm))
1148                 return TRACE_TYPE_PARTIAL_LINE;
1149
1150         return TRACE_TYPE_HANDLED;
1151 }
1152
1153 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1154                                          struct trace_event *event)
1155 {
1156         return trace_ctxwake_print(iter, "==>");
1157 }
1158
1159 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1160                                           int flags, struct trace_event *event)
1161 {
1162         return trace_ctxwake_print(iter, "  +");
1163 }
1164
1165 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1166 {
1167         struct ctx_switch_entry *field;
1168         int T;
1169
1170         trace_assign_type(field, iter->ent);
1171
1172         if (!S)
1173                 S = task_state_char(field->prev_state);
1174         T = task_state_char(field->next_state);
1175         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1176                               field->prev_pid,
1177                               field->prev_prio,
1178                               S,
1179                               field->next_cpu,
1180                               field->next_pid,
1181                               field->next_prio,
1182                               T))
1183                 return TRACE_TYPE_PARTIAL_LINE;
1184
1185         return TRACE_TYPE_HANDLED;
1186 }
1187
1188 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1189                                        struct trace_event *event)
1190 {
1191         return trace_ctxwake_raw(iter, 0);
1192 }
1193
1194 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1195                                         struct trace_event *event)
1196 {
1197         return trace_ctxwake_raw(iter, '+');
1198 }
1199
1200
1201 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1202 {
1203         struct ctx_switch_entry *field;
1204         struct trace_seq *s = &iter->seq;
1205         int T;
1206
1207         trace_assign_type(field, iter->ent);
1208
1209         if (!S)
1210                 S = task_state_char(field->prev_state);
1211         T = task_state_char(field->next_state);
1212
1213         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1214         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1215         SEQ_PUT_HEX_FIELD_RET(s, S);
1216         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1217         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1218         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1219         SEQ_PUT_HEX_FIELD_RET(s, T);
1220
1221         return TRACE_TYPE_HANDLED;
1222 }
1223
1224 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1225                                        struct trace_event *event)
1226 {
1227         return trace_ctxwake_hex(iter, 0);
1228 }
1229
1230 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1231                                         struct trace_event *event)
1232 {
1233         return trace_ctxwake_hex(iter, '+');
1234 }
1235
1236 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1237                                            int flags, struct trace_event *event)
1238 {
1239         struct ctx_switch_entry *field;
1240         struct trace_seq *s = &iter->seq;
1241
1242         trace_assign_type(field, iter->ent);
1243
1244         SEQ_PUT_FIELD_RET(s, field->prev_pid);
1245         SEQ_PUT_FIELD_RET(s, field->prev_prio);
1246         SEQ_PUT_FIELD_RET(s, field->prev_state);
1247         SEQ_PUT_FIELD_RET(s, field->next_pid);
1248         SEQ_PUT_FIELD_RET(s, field->next_prio);
1249         SEQ_PUT_FIELD_RET(s, field->next_state);
1250
1251         return TRACE_TYPE_HANDLED;
1252 }
1253
1254 static struct trace_event_functions trace_ctx_funcs = {
1255         .trace          = trace_ctx_print,
1256         .raw            = trace_ctx_raw,
1257         .hex            = trace_ctx_hex,
1258         .binary         = trace_ctxwake_bin,
1259 };
1260
1261 static struct trace_event trace_ctx_event = {
1262         .type           = TRACE_CTX,
1263         .funcs          = &trace_ctx_funcs,
1264 };
1265
1266 static struct trace_event_functions trace_wake_funcs = {
1267         .trace          = trace_wake_print,
1268         .raw            = trace_wake_raw,
1269         .hex            = trace_wake_hex,
1270         .binary         = trace_ctxwake_bin,
1271 };
1272
1273 static struct trace_event trace_wake_event = {
1274         .type           = TRACE_WAKE,
1275         .funcs          = &trace_wake_funcs,
1276 };
1277
1278 /* TRACE_STACK */
1279
1280 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1281                                            int flags, struct trace_event *event)
1282 {
1283         struct stack_entry *field;
1284         struct trace_seq *s = &iter->seq;
1285         unsigned long *p;
1286         unsigned long *end;
1287
1288         trace_assign_type(field, iter->ent);
1289         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1290
1291         if (!trace_seq_puts(s, "<stack trace>\n"))
1292                 goto partial;
1293
1294         for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1295                 if (!trace_seq_puts(s, " => "))
1296                         goto partial;
1297
1298                 if (!seq_print_ip_sym(s, *p, flags))
1299                         goto partial;
1300                 if (!trace_seq_putc(s, '\n'))
1301                         goto partial;
1302         }
1303
1304         return TRACE_TYPE_HANDLED;
1305
1306  partial:
1307         return TRACE_TYPE_PARTIAL_LINE;
1308 }
1309
1310 static struct trace_event_functions trace_stack_funcs = {
1311         .trace          = trace_stack_print,
1312 };
1313
1314 static struct trace_event trace_stack_event = {
1315         .type           = TRACE_STACK,
1316         .funcs          = &trace_stack_funcs,
1317 };
1318
1319 /* TRACE_USER_STACK */
1320 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1321                                                 int flags, struct trace_event *event)
1322 {
1323         struct userstack_entry *field;
1324         struct trace_seq *s = &iter->seq;
1325
1326         trace_assign_type(field, iter->ent);
1327
1328         if (!trace_seq_puts(s, "<user stack trace>\n"))
1329                 goto partial;
1330
1331         if (!seq_print_userip_objs(field, s, flags))
1332                 goto partial;
1333
1334         return TRACE_TYPE_HANDLED;
1335
1336  partial:
1337         return TRACE_TYPE_PARTIAL_LINE;
1338 }
1339
1340 static struct trace_event_functions trace_user_stack_funcs = {
1341         .trace          = trace_user_stack_print,
1342 };
1343
1344 static struct trace_event trace_user_stack_event = {
1345         .type           = TRACE_USER_STACK,
1346         .funcs          = &trace_user_stack_funcs,
1347 };
1348
1349 /* TRACE_BPUTS */
1350 static enum print_line_t
1351 trace_bputs_print(struct trace_iterator *iter, int flags,
1352                    struct trace_event *event)
1353 {
1354         struct trace_entry *entry = iter->ent;
1355         struct trace_seq *s = &iter->seq;
1356         struct bputs_entry *field;
1357
1358         trace_assign_type(field, entry);
1359
1360         if (!seq_print_ip_sym(s, field->ip, flags))
1361                 goto partial;
1362
1363         if (!trace_seq_puts(s, ": "))
1364                 goto partial;
1365
1366         if (!trace_seq_puts(s, field->str))
1367                 goto partial;
1368
1369         return TRACE_TYPE_HANDLED;
1370
1371  partial:
1372         return TRACE_TYPE_PARTIAL_LINE;
1373 }
1374
1375
1376 static enum print_line_t
1377 trace_bputs_raw(struct trace_iterator *iter, int flags,
1378                 struct trace_event *event)
1379 {
1380         struct bputs_entry *field;
1381         struct trace_seq *s = &iter->seq;
1382
1383         trace_assign_type(field, iter->ent);
1384
1385         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1386                 goto partial;
1387
1388         if (!trace_seq_puts(s, field->str))
1389                 goto partial;
1390
1391         return TRACE_TYPE_HANDLED;
1392
1393  partial:
1394         return TRACE_TYPE_PARTIAL_LINE;
1395 }
1396
1397 static struct trace_event_functions trace_bputs_funcs = {
1398         .trace          = trace_bputs_print,
1399         .raw            = trace_bputs_raw,
1400 };
1401
1402 static struct trace_event trace_bputs_event = {
1403         .type           = TRACE_BPUTS,
1404         .funcs          = &trace_bputs_funcs,
1405 };
1406
1407 /* TRACE_BPRINT */
1408 static enum print_line_t
1409 trace_bprint_print(struct trace_iterator *iter, int flags,
1410                    struct trace_event *event)
1411 {
1412         struct trace_entry *entry = iter->ent;
1413         struct trace_seq *s = &iter->seq;
1414         struct bprint_entry *field;
1415
1416         trace_assign_type(field, entry);
1417
1418         if (!seq_print_ip_sym(s, field->ip, flags))
1419                 goto partial;
1420
1421         if (!trace_seq_puts(s, ": "))
1422                 goto partial;
1423
1424         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1425                 goto partial;
1426
1427         return TRACE_TYPE_HANDLED;
1428
1429  partial:
1430         return TRACE_TYPE_PARTIAL_LINE;
1431 }
1432
1433
1434 static enum print_line_t
1435 trace_bprint_raw(struct trace_iterator *iter, int flags,
1436                  struct trace_event *event)
1437 {
1438         struct bprint_entry *field;
1439         struct trace_seq *s = &iter->seq;
1440
1441         trace_assign_type(field, iter->ent);
1442
1443         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1444                 goto partial;
1445
1446         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1447                 goto partial;
1448
1449         return TRACE_TYPE_HANDLED;
1450
1451  partial:
1452         return TRACE_TYPE_PARTIAL_LINE;
1453 }
1454
1455 static struct trace_event_functions trace_bprint_funcs = {
1456         .trace          = trace_bprint_print,
1457         .raw            = trace_bprint_raw,
1458 };
1459
1460 static struct trace_event trace_bprint_event = {
1461         .type           = TRACE_BPRINT,
1462         .funcs          = &trace_bprint_funcs,
1463 };
1464
1465 /* TRACE_PRINT */
1466 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1467                                            int flags, struct trace_event *event)
1468 {
1469         struct print_entry *field;
1470         struct trace_seq *s = &iter->seq;
1471
1472         trace_assign_type(field, iter->ent);
1473
1474         if (!seq_print_ip_sym(s, field->ip, flags))
1475                 goto partial;
1476
1477         if (!trace_seq_printf(s, ": %s", field->buf))
1478                 goto partial;
1479
1480         return TRACE_TYPE_HANDLED;
1481
1482  partial:
1483         return TRACE_TYPE_PARTIAL_LINE;
1484 }
1485
1486 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1487                                          struct trace_event *event)
1488 {
1489         struct print_entry *field;
1490
1491         trace_assign_type(field, iter->ent);
1492
1493         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1494                 goto partial;
1495
1496         return TRACE_TYPE_HANDLED;
1497
1498  partial:
1499         return TRACE_TYPE_PARTIAL_LINE;
1500 }
1501
1502 static struct trace_event_functions trace_print_funcs = {
1503         .trace          = trace_print_print,
1504         .raw            = trace_print_raw,
1505 };
1506
1507 static struct trace_event trace_print_event = {
1508         .type           = TRACE_PRINT,
1509         .funcs          = &trace_print_funcs,
1510 };
1511
1512
1513 static struct trace_event *events[] __initdata = {
1514         &trace_fn_event,
1515         &trace_ctx_event,
1516         &trace_wake_event,
1517         &trace_stack_event,
1518         &trace_user_stack_event,
1519         &trace_bputs_event,
1520         &trace_bprint_event,
1521         &trace_print_event,
1522         NULL
1523 };
1524
1525 __init static int init_events(void)
1526 {
1527         struct trace_event *event;
1528         int i, ret;
1529
1530         for (i = 0; events[i]; i++) {
1531                 event = events[i];
1532
1533                 ret = register_ftrace_event(event);
1534                 if (!ret) {
1535                         printk(KERN_WARNING "event %d failed to register\n",
1536                                event->type);
1537                         WARN_ON_ONCE(1);
1538                 }
1539         }
1540
1541         return 0;
1542 }
1543 early_initcall(init_events);