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_printf(s, "%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_vprintf - sequence printing of trace information
 130  * @s: trace sequence descriptor
 131  * @fmt: printf format string
 132  *
 133  * The tracer may use either sequence operations or its own
 134  * copy to user routines. To simplify formating of a trace
 135  * trace_seq_printf is used to store strings into a special
 136  * buffer (@s). Then the output may be either used by
 137  * the sequencer or pulled into another buffer.
 138  */
 139 int
 140 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 141 {
 142         int len = (PAGE_SIZE - 1) - s->len;
 143         int ret;
 144
 145         if (s->full || !len)
 146                 return 0;
 147
 148         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 149
 150         /* If we can't write it all, don't bother writing anything */
 151         if (ret >= len) {
 152                 s->full = 1;
 153                 return 0;
 154         }
 155
 156         s->len += ret;
 157
 158         return len;
 159 }
 160 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 161
 162 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 163 {
 164         int len = (PAGE_SIZE - 1) - s->len;
 165         int ret;
 166
 167         if (s->full || !len)
 168                 return 0;
 169
 170         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 171
 172         /* If we can't write it all, don't bother writing anything */
 173         if (ret >= len) {
 174                 s->full = 1;
 175                 return 0;
 176         }
 177
 178         s->len += ret;
 179
 180         return len;
 181 }
 182
 183 /**
 184  * trace_seq_puts - trace sequence printing of simple string
 185  * @s: trace sequence descriptor
 186  * @str: simple string to record
 187  *
 188  * The tracer may use either the sequence operations or its own
 189  * copy to user routines. This function records a simple string
 190  * into a special buffer (@s) for later retrieval by a sequencer
 191  * or other mechanism.
 192  */
 193 int trace_seq_puts(struct trace_seq *s, const char *str)
 194 {
 195         int len = strlen(str);
 196
 197         if (s->full)
 198                 return 0;
 199
 200         if (len > ((PAGE_SIZE - 1) - s->len)) {
 201                 s->full = 1;
 202                 return 0;
 203         }
 204
 205         memcpy(s->buffer + s->len, str, len);
 206         s->len += len;
 207
 208         return len;
 209 }
 210
 211 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 212 {
 213         if (s->full)
 214                 return 0;
 215
 216         if (s->len >= (PAGE_SIZE - 1)) {
 217                 s->full = 1;
 218                 return 0;
 219         }
 220
 221         s->buffer[s->len++] = c;
 222
 223         return 1;
 224 }
 225 EXPORT_SYMBOL(trace_seq_putc);
 226
 227 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 228 {
 229         if (s->full)
 230                 return 0;
 231
 232         if (len > ((PAGE_SIZE - 1) - s->len)) {
 233                 s->full = 1;
 234                 return 0;
 235         }
 236
 237         memcpy(s->buffer + s->len, mem, len);
 238         s->len += len;
 239
 240         return len;
 241 }
 242
 243 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 244 {
 245         unsigned char hex[HEX_CHARS];
 246         const unsigned char *data = mem;
 247         int i, j;
 248
 249         if (s->full)
 250                 return 0;
 251
 252 #ifdef __BIG_ENDIAN
 253         for (i = 0, j = 0; i < len; i++) {
 254 #else
 255         for (i = len-1, j = 0; i >= 0; i--) {
 256 #endif
 257                 hex[j++] = hex_asc_hi(data[i]);
 258                 hex[j++] = hex_asc_lo(data[i]);
 259         }
 260         hex[j++] = ' ';
 261
 262         return trace_seq_putmem(s, hex, j);
 263 }
 264
 265 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 266 {
 267         void *ret;
 268
 269         if (s->full)
 270                 return NULL;
 271
 272         if (len > ((PAGE_SIZE - 1) - s->len)) {
 273                 s->full = 1;
 274                 return NULL;
 275         }
 276
 277         ret = s->buffer + s->len;
 278         s->len += len;
 279
 280         return ret;
 281 }
 282
 283 int trace_seq_path(struct trace_seq *s, const struct path *path)
 284 {
 285         unsigned char *p;
 286
 287         if (s->full)
 288                 return 0;
 289
 290         if (s->len >= (PAGE_SIZE - 1)) {
 291                 s->full = 1;
 292                 return 0;
 293         }
 294
 295         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 296         if (!IS_ERR(p)) {
 297                 p = mangle_path(s->buffer + s->len, p, "\n");
 298                 if (p) {
 299                         s->len = p - s->buffer;
 300                         return 1;
 301                 }
 302         } else {
 303                 s->buffer[s->len++] = '?';
 304                 return 1;
 305         }
 306
 307         s->full = 1;
 308         return 0;
 309 }
 310
 311 const char *
 312 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 313                        unsigned long flags,
 314                        const struct trace_print_flags *flag_array)
 315 {
 316         unsigned long mask;
 317         const char *str;
 318         const char *ret = p->buffer + p->len;
 319         int i, first = 1;
 320
 321         for (i = 0;  flag_array[i].name && flags; i++) {
 322
 323                 mask = flag_array[i].mask;
 324                 if ((flags & mask) != mask)
 325                         continue;
 326
 327                 str = flag_array[i].name;
 328                 flags &= ~mask;
 329                 if (!first && delim)
 330                         trace_seq_puts(p, delim);
 331                 else
 332                         first = 0;
 333                 trace_seq_puts(p, str);
 334         }
 335
 336         /* check for left over flags */
 337         if (flags) {
 338                 if (!first && delim)
 339                         trace_seq_puts(p, delim);
 340                 trace_seq_printf(p, "0x%lx", flags);
 341         }
 342
 343         trace_seq_putc(p, 0);
 344
 345         return ret;
 346 }
 347 EXPORT_SYMBOL(ftrace_print_flags_seq);
 348
 349 const char *
 350 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 351                          const struct trace_print_flags *symbol_array)
 352 {
 353         int i;
 354         const char *ret = p->buffer + p->len;
 355
 356         for (i = 0;  symbol_array[i].name; i++) {
 357
 358                 if (val != symbol_array[i].mask)
 359                         continue;
 360
 361                 trace_seq_puts(p, symbol_array[i].name);
 362                 break;
 363         }
 364
 365         if (ret == (const char *)(p->buffer + p->len))
 366                 trace_seq_printf(p, "0x%lx", val);
 367
 368         trace_seq_putc(p, 0);
 369
 370         return ret;
 371 }
 372 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 373
 374 #if BITS_PER_LONG == 32
 375 const char *
 376 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 377                          const struct trace_print_flags_u64 *symbol_array)
 378 {
 379         int i;
 380         const char *ret = p->buffer + p->len;
 381
 382         for (i = 0;  symbol_array[i].name; i++) {
 383
 384                 if (val != symbol_array[i].mask)
 385                         continue;
 386
 387                 trace_seq_puts(p, symbol_array[i].name);
 388                 break;
 389         }
 390
 391         if (ret == (const char *)(p->buffer + p->len))
 392                 trace_seq_printf(p, "0x%llx", val);
 393
 394         trace_seq_putc(p, 0);
 395
 396         return ret;
 397 }
 398 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
 399 #endif
 400
 401 const char *
 402 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 403 {
 404         int i;
 405         const char *ret = p->buffer + p->len;
 406
 407         for (i = 0; i < buf_len; i++)
 408                 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
 409
 410         trace_seq_putc(p, 0);
 411
 412         return ret;
 413 }
 414 EXPORT_SYMBOL(ftrace_print_hex_seq);
 415
 416 int ftrace_raw_output_prep(struct trace_iterator *iter,
 417                            struct trace_event *trace_event)
 418 {
 419         struct ftrace_event_call *event;
 420         struct trace_seq *s = &iter->seq;
 421         struct trace_seq *p = &iter->tmp_seq;
 422         struct trace_entry *entry;
 423         int ret;
 424
 425         event = container_of(trace_event, struct ftrace_event_call, event);
 426         entry = iter->ent;
 427
 428         if (entry->type != event->event.type) {
 429                 WARN_ON_ONCE(1);
 430                 return TRACE_TYPE_UNHANDLED;
 431         }
 432
 433         trace_seq_init(p);
 434         ret = trace_seq_printf(s, "%s: ", event->name);
 435         if (!ret)
 436                 return TRACE_TYPE_PARTIAL_LINE;
 437
 438         return 0;
 439 }
 440 EXPORT_SYMBOL(ftrace_raw_output_prep);
 441
 442 #ifdef CONFIG_KRETPROBES
 443 static inline const char *kretprobed(const char *name)
 444 {
 445         static const char tramp_name[] = "kretprobe_trampoline";
 446         int size = sizeof(tramp_name);
 447
 448         if (strncmp(tramp_name, name, size) == 0)
 449                 return "[unknown/kretprobe'd]";
 450         return name;
 451 }
 452 #else
 453 static inline const char *kretprobed(const char *name)
 454 {
 455         return name;
 456 }
 457 #endif /* CONFIG_KRETPROBES */
 458
 459 static int
 460 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 461 {
 462 #ifdef CONFIG_KALLSYMS
 463         char str[KSYM_SYMBOL_LEN];
 464         const char *name;
 465
 466         kallsyms_lookup(address, NULL, NULL, NULL, str);
 467
 468         name = kretprobed(str);
 469
 470         return trace_seq_printf(s, fmt, name);
 471 #endif
 472         return 1;
 473 }
 474
 475 static int
 476 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 477                      unsigned long address)
 478 {
 479 #ifdef CONFIG_KALLSYMS
 480         char str[KSYM_SYMBOL_LEN];
 481         const char *name;
 482
 483         sprint_symbol(str, address);
 484         name = kretprobed(str);
 485
 486         return trace_seq_printf(s, fmt, name);
 487 #endif
 488         return 1;
 489 }
 490
 491 #ifndef CONFIG_64BIT
 492 # define IP_FMT "%08lx"
 493 #else
 494 # define IP_FMT "%016lx"
 495 #endif
 496
 497 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 498                       unsigned long ip, unsigned long sym_flags)
 499 {
 500         struct file *file = NULL;
 501         unsigned long vmstart = 0;
 502         int ret = 1;
 503
 504         if (s->full)
 505                 return 0;
 506
 507         if (mm) {
 508                 const struct vm_area_struct *vma;
 509
 510                 down_read(&mm->mmap_sem);
 511                 vma = find_vma(mm, ip);
 512                 if (vma) {
 513                         file = vma->vm_file;
 514                         vmstart = vma->vm_start;
 515                 }
 516                 if (file) {
 517                         ret = trace_seq_path(s, &file->f_path);
 518                         if (ret)
 519                                 ret = trace_seq_printf(s, "[+0x%lx]",
 520                                                        ip - vmstart);
 521                 }
 522                 up_read(&mm->mmap_sem);
 523         }
 524         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 525                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 526         return ret;
 527 }
 528
 529 int
 530 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 531                       unsigned long sym_flags)
 532 {
 533         struct mm_struct *mm = NULL;
 534         int ret = 1;
 535         unsigned int i;
 536
 537         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 538                 struct task_struct *task;
 539                 /*
 540                  * we do the lookup on the thread group leader,
 541                  * since individual threads might have already quit!
 542                  */
 543                 rcu_read_lock();
 544                 task = find_task_by_vpid(entry->tgid);
 545                 if (task)
 546                         mm = get_task_mm(task);
 547                 rcu_read_unlock();
 548         }
 549
 550         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 551                 unsigned long ip = entry->caller[i];
 552
 553                 if (ip == ULONG_MAX || !ret)
 554                         break;
 555                 if (ret)
 556                         ret = trace_seq_puts(s, " => ");
 557                 if (!ip) {
 558                         if (ret)
 559                                 ret = trace_seq_puts(s, "??");
 560                         if (ret)
 561                                 ret = trace_seq_puts(s, "\n");
 562                         continue;
 563                 }
 564                 if (!ret)
 565                         break;
 566                 if (ret)
 567                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 568                 ret = trace_seq_puts(s, "\n");
 569         }
 570
 571         if (mm)
 572                 mmput(mm);
 573         return ret;
 574 }
 575
 576 int
 577 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 578 {
 579         int ret;
 580
 581         if (!ip)
 582                 return trace_seq_printf(s, "0");
 583
 584         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 585                 ret = seq_print_sym_offset(s, "%s", ip);
 586         else
 587                 ret = seq_print_sym_short(s, "%s", ip);
 588
 589         if (!ret)
 590                 return 0;
 591
 592         if (sym_flags & TRACE_ITER_SYM_ADDR)
 593                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 594         return ret;
 595 }
 596
 597 /**
 598  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 599  * @s: trace seq struct to write to
 600  * @entry: The trace entry field from the ring buffer
 601  *
 602  * Prints the generic fields of irqs off, in hard or softirq, preempt
 603  * count.
 604  */
 605 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 606 {
 607         char hardsoft_irq;
 608         char need_resched;
 609         char irqs_off;
 610         int hardirq;
 611         int softirq;
 612         int ret;
 613
 614         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 615         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 616
 617         irqs_off =
 618                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 619                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 620                 '.';
 621         need_resched =
 622                 (entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
 623         hardsoft_irq =
 624                 (hardirq && softirq) ? 'H' :
 625                 hardirq ? 'h' :
 626                 softirq ? 's' :
 627                 '.';
 628
 629         if (!trace_seq_printf(s, "%c%c%c",
 630                               irqs_off, need_resched, hardsoft_irq))
 631                 return 0;
 632
 633         if (entry->preempt_count)
 634                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
 635         else
 636                 ret = trace_seq_putc(s, '.');
 637
 638         return ret;
 639 }
 640
 641 static int
 642 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 643 {
 644         char comm[TASK_COMM_LEN];
 645
 646         trace_find_cmdline(entry->pid, comm);
 647
 648         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 649                               comm, entry->pid, cpu))
 650                 return 0;
 651
 652         return trace_print_lat_fmt(s, entry);
 653 }
 654
 655 static unsigned long preempt_mark_thresh_us = 100;
 656
 657 static int
 658 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 659 {
 660         unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
 661         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 662         unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 663         unsigned long long rel_ts = next_ts - iter->ts;
 664         struct trace_seq *s = &iter->seq;
 665
 666         if (in_ns) {
 667                 abs_ts = ns2usecs(abs_ts);
 668                 rel_ts = ns2usecs(rel_ts);
 669         }
 670
 671         if (verbose && in_ns) {
 672                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 673                 unsigned long abs_msec = (unsigned long)abs_ts;
 674                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 675                 unsigned long rel_msec = (unsigned long)rel_ts;
 676
 677                 return trace_seq_printf(
 678                                 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 679                                 ns2usecs(iter->ts),
 680                                 abs_msec, abs_usec,
 681                                 rel_msec, rel_usec);
 682         } else if (verbose && !in_ns) {
 683                 return trace_seq_printf(
 684                                 s, "[%016llx] %lld (+%lld): ",
 685                                 iter->ts, abs_ts, rel_ts);
 686         } else if (!verbose && in_ns) {
 687                 return trace_seq_printf(
 688                                 s, " %4lldus%c: ",
 689                                 abs_ts,
 690                                 rel_ts > preempt_mark_thresh_us ? '!' :
 691                                   rel_ts > 1 ? '+' : ' ');
 692         } else { /* !verbose && !in_ns */
 693                 return trace_seq_printf(s, " %4lld: ", abs_ts);
 694         }
 695 }
 696
 697 int trace_print_context(struct trace_iterator *iter)
 698 {
 699         struct trace_seq *s = &iter->seq;
 700         struct trace_entry *entry = iter->ent;
 701         unsigned long long t;
 702         unsigned long secs, usec_rem;
 703         char comm[TASK_COMM_LEN];
 704         int ret;
 705         int tgid;
 706
 707         trace_find_cmdline(entry->pid, comm);
 708
 709         ret = trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
 710         if (!ret)
 711                 return 0;
 712
 713         if (trace_flags & TRACE_ITER_TGID) {
 714                 tgid = trace_find_tgid(entry->pid);
 715                 if (tgid < 0)
 716                         ret = trace_seq_puts(s, "(-----) ");
 717                 else
 718                         ret = trace_seq_printf(s, "(%5d) ", tgid);
 719                 if (!ret)
 720                         return 0;
 721         }
 722
 723         ret = trace_seq_printf(s, "[%03d] ", iter->cpu);
 724         if (!ret)
 725                 return 0;
 726
 727         if (trace_flags & TRACE_ITER_IRQ_INFO) {
 728                 ret = trace_print_lat_fmt(s, entry);
 729                 if (!ret)
 730                         return 0;
 731         }
 732
 733         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 734                 t = ns2usecs(iter->ts);
 735                 usec_rem = do_div(t, USEC_PER_SEC);
 736                 secs = (unsigned long)t;
 737                 return trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
 738         } else
 739                 return trace_seq_printf(s, " %12llu: ", iter->ts);
 740 }
 741
 742 int trace_print_lat_context(struct trace_iterator *iter)
 743 {
 744         u64 next_ts;
 745         int ret;
 746         /* trace_find_next_entry will reset ent_size */
 747         int ent_size = iter->ent_size;
 748         struct trace_seq *s = &iter->seq;
 749         struct trace_entry *entry = iter->ent,
 750                            *next_entry = trace_find_next_entry(iter, NULL,
 751                                                                &next_ts);
 752         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 753
 754         /* Restore the original ent_size */
 755         iter->ent_size = ent_size;
 756
 757         if (!next_entry)
 758                 next_ts = iter->ts;
 759
 760         if (verbose) {
 761                 char comm[TASK_COMM_LEN];
 762
 763                 trace_find_cmdline(entry->pid, comm);
 764
 765                 ret = trace_seq_printf(
 766                                 s, "%16s %5d %3d %d %08x %08lx ",
 767                                 comm, entry->pid, iter->cpu, entry->flags,
 768                                 entry->preempt_count, iter->idx);
 769         } else {
 770                 ret = lat_print_generic(s, entry, iter->cpu);
 771         }
 772
 773         if (ret)
 774                 ret = lat_print_timestamp(iter, next_ts);
 775
 776         return ret;
 777 }
 778
 779 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 780
 781 static int task_state_char(unsigned long state)
 782 {
 783         int bit = state ? __ffs(state) + 1 : 0;
 784
 785         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 786 }
 787
 788 /**
 789  * ftrace_find_event - find a registered event
 790  * @type: the type of event to look for
 791  *
 792  * Returns an event of type @type otherwise NULL
 793  * Called with trace_event_read_lock() held.
 794  */
 795 struct trace_event *ftrace_find_event(int type)
 796 {
 797         struct trace_event *event;
 798         unsigned key;
 799
 800         key = type & (EVENT_HASHSIZE - 1);
 801
 802         hlist_for_each_entry(event, &event_hash[key], node) {
 803                 if (event->type == type)
 804                         return event;
 805         }
 806
 807         return NULL;
 808 }
 809
 810 static LIST_HEAD(ftrace_event_list);
 811
 812 static int trace_search_list(struct list_head **list)
 813 {
 814         struct trace_event *e;
 815         int last = __TRACE_LAST_TYPE;
 816
 817         if (list_empty(&ftrace_event_list)) {
 818                 *list = &ftrace_event_list;
 819                 return last + 1;
 820         }
 821
 822         /*
 823          * We used up all possible max events,
 824          * lets see if somebody freed one.
 825          */
 826         list_for_each_entry(e, &ftrace_event_list, list) {
 827                 if (e->type != last + 1)
 828                         break;
 829                 last++;
 830         }
 831
 832         /* Did we used up all 65 thousand events??? */
 833         if ((last + 1) > FTRACE_MAX_EVENT)
 834                 return 0;
 835
 836         *list = &e->list;
 837         return last + 1;
 838 }
 839
 840 void trace_event_read_lock(void)
 841 {
 842         down_read(&trace_event_sem);
 843 }
 844
 845 void trace_event_read_unlock(void)
 846 {
 847         up_read(&trace_event_sem);
 848 }
 849
 850 /**
 851  * register_ftrace_event - register output for an event type
 852  * @event: the event type to register
 853  *
 854  * Event types are stored in a hash and this hash is used to
 855  * find a way to print an event. If the @event->type is set
 856  * then it will use that type, otherwise it will assign a
 857  * type to use.
 858  *
 859  * If you assign your own type, please make sure it is added
 860  * to the trace_type enum in trace.h, to avoid collisions
 861  * with the dynamic types.
 862  *
 863  * Returns the event type number or zero on error.
 864  */
 865 int register_ftrace_event(struct trace_event *event)
 866 {
 867         unsigned key;
 868         int ret = 0;
 869
 870         down_write(&trace_event_sem);
 871
 872         if (WARN_ON(!event))
 873                 goto out;
 874
 875         if (WARN_ON(!event->funcs))
 876                 goto out;
 877
 878         INIT_LIST_HEAD(&event->list);
 879
 880         if (!event->type) {
 881                 struct list_head *list = NULL;
 882
 883                 if (next_event_type > FTRACE_MAX_EVENT) {
 884
 885                         event->type = trace_search_list(&list);
 886                         if (!event->type)
 887                                 goto out;
 888
 889                 } else {
 890
 891                         event->type = next_event_type++;
 892                         list = &ftrace_event_list;
 893                 }
 894
 895                 if (WARN_ON(ftrace_find_event(event->type)))
 896                         goto out;
 897
 898                 list_add_tail(&event->list, list);
 899
 900         } else if (event->type > __TRACE_LAST_TYPE) {
 901                 printk(KERN_WARNING "Need to add type to trace.h\n");
 902                 WARN_ON(1);
 903                 goto out;
 904         } else {
 905                 /* Is this event already used */
 906                 if (ftrace_find_event(event->type))
 907                         goto out;
 908         }
 909
 910         if (event->funcs->trace == NULL)
 911                 event->funcs->trace = trace_nop_print;
 912         if (event->funcs->raw == NULL)
 913                 event->funcs->raw = trace_nop_print;
 914         if (event->funcs->hex == NULL)
 915                 event->funcs->hex = trace_nop_print;
 916         if (event->funcs->binary == NULL)
 917                 event->funcs->binary = trace_nop_print;
 918
 919         key = event->type & (EVENT_HASHSIZE - 1);
 920
 921         hlist_add_head(&event->node, &event_hash[key]);
 922
 923         ret = event->type;
 924  out:
 925         up_write(&trace_event_sem);
 926
 927         return ret;
 928 }
 929 EXPORT_SYMBOL_GPL(register_ftrace_event);
 930
 931 /*
 932  * Used by module code with the trace_event_sem held for write.
 933  */
 934 int __unregister_ftrace_event(struct trace_event *event)
 935 {
 936         hlist_del(&event->node);
 937         list_del(&event->list);
 938         return 0;
 939 }
 940
 941 /**
 942  * unregister_ftrace_event - remove a no longer used event
 943  * @event: the event to remove
 944  */
 945 int unregister_ftrace_event(struct trace_event *event)
 946 {
 947         down_write(&trace_event_sem);
 948         __unregister_ftrace_event(event);
 949         up_write(&trace_event_sem);
 950
 951         return 0;
 952 }
 953 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 954
 955 /*
 956  * Standard events
 957  */
 958
 959 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 960                                   struct trace_event *event)
 961 {
 962         if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
 963                 return TRACE_TYPE_PARTIAL_LINE;
 964
 965         return TRACE_TYPE_HANDLED;
 966 }
 967
 968 /* TRACE_FN */
 969 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 970                                         struct trace_event *event)
 971 {
 972         struct ftrace_entry *field;
 973         struct trace_seq *s = &iter->seq;
 974
 975         trace_assign_type(field, iter->ent);
 976
 977         if (!seq_print_ip_sym(s, field->ip, flags))
 978                 goto partial;
 979
 980         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 981                 if (!trace_seq_printf(s, " <-"))
 982                         goto partial;
 983                 if (!seq_print_ip_sym(s,
 984                                       field->parent_ip,
 985                                       flags))
 986                         goto partial;
 987         }
 988         if (!trace_seq_printf(s, "\n"))
 989                 goto partial;
 990
 991         return TRACE_TYPE_HANDLED;
 992
 993  partial:
 994         return TRACE_TYPE_PARTIAL_LINE;
 995 }
 996
 997 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 998                                       struct trace_event *event)
 999 {
1000         struct ftrace_entry *field;
1001
1002         trace_assign_type(field, iter->ent);
1003
1004         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
1005                               field->ip,
1006                               field->parent_ip))
1007                 return TRACE_TYPE_PARTIAL_LINE;
1008
1009         return TRACE_TYPE_HANDLED;
1010 }
1011
1012 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1013                                       struct trace_event *event)
1014 {
1015         struct ftrace_entry *field;
1016         struct trace_seq *s = &iter->seq;
1017
1018         trace_assign_type(field, iter->ent);
1019
1020         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
1021         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
1022
1023         return TRACE_TYPE_HANDLED;
1024 }
1025
1026 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1027                                       struct trace_event *event)
1028 {
1029         struct ftrace_entry *field;
1030         struct trace_seq *s = &iter->seq;
1031
1032         trace_assign_type(field, iter->ent);
1033
1034         SEQ_PUT_FIELD_RET(s, field->ip);
1035         SEQ_PUT_FIELD_RET(s, field->parent_ip);
1036
1037         return TRACE_TYPE_HANDLED;
1038 }
1039
1040 static struct trace_event_functions trace_fn_funcs = {
1041         .trace          = trace_fn_trace,
1042         .raw            = trace_fn_raw,
1043         .hex            = trace_fn_hex,
1044         .binary         = trace_fn_bin,
1045 };
1046
1047 static struct trace_event trace_fn_event = {
1048         .type           = TRACE_FN,
1049         .funcs          = &trace_fn_funcs,
1050 };
1051
1052 /* TRACE_GRAPH_ENT */
1053 static enum print_line_t trace_graph_ent_trace(struct trace_iterator *iter, int flags,
1054                                         struct trace_event *event)
1055 {
1056         struct trace_seq *s = &iter->seq;
1057         struct ftrace_graph_ent_entry *field;
1058
1059         trace_assign_type(field, iter->ent);
1060
1061         if (!trace_seq_puts(s, "graph_ent: func="))
1062                 return TRACE_TYPE_PARTIAL_LINE;
1063
1064         if (!seq_print_ip_sym(s, field->graph_ent.func, flags))
1065                 return TRACE_TYPE_PARTIAL_LINE;
1066
1067         if (!trace_seq_puts(s, "\n"))
1068                 return TRACE_TYPE_PARTIAL_LINE;
1069
1070         return TRACE_TYPE_HANDLED;
1071 }
1072
1073 static enum print_line_t trace_graph_ent_raw(struct trace_iterator *iter, int flags,
1074                                       struct trace_event *event)
1075 {
1076         struct ftrace_graph_ent_entry *field;
1077
1078         trace_assign_type(field, iter->ent);
1079
1080         if (!trace_seq_printf(&iter->seq, "%lx %d\n",
1081                               field->graph_ent.func,
1082                               field->graph_ent.depth))
1083                 return TRACE_TYPE_PARTIAL_LINE;
1084
1085         return TRACE_TYPE_HANDLED;
1086 }
1087
1088 static enum print_line_t trace_graph_ent_hex(struct trace_iterator *iter, int flags,
1089                                       struct trace_event *event)
1090 {
1091         struct ftrace_graph_ent_entry *field;
1092         struct trace_seq *s = &iter->seq;
1093
1094         trace_assign_type(field, iter->ent);
1095
1096         SEQ_PUT_HEX_FIELD_RET(s, field->graph_ent.func);
1097         SEQ_PUT_HEX_FIELD_RET(s, field->graph_ent.depth);
1098
1099         return TRACE_TYPE_HANDLED;
1100 }
1101
1102 static enum print_line_t trace_graph_ent_bin(struct trace_iterator *iter, int flags,
1103                                       struct trace_event *event)
1104 {
1105         struct ftrace_graph_ent_entry *field;
1106         struct trace_seq *s = &iter->seq;
1107
1108         trace_assign_type(field, iter->ent);
1109
1110         SEQ_PUT_FIELD_RET(s, field->graph_ent.func);
1111         SEQ_PUT_FIELD_RET(s, field->graph_ent.depth);
1112
1113         return TRACE_TYPE_HANDLED;
1114 }
1115
1116 static struct trace_event_functions trace_graph_ent_funcs = {
1117         .trace          = trace_graph_ent_trace,
1118         .raw            = trace_graph_ent_raw,
1119         .hex            = trace_graph_ent_hex,
1120         .binary         = trace_graph_ent_bin,
1121 };
1122
1123 static struct trace_event trace_graph_ent_event = {
1124         .type           = TRACE_GRAPH_ENT,
1125         .funcs          = &trace_graph_ent_funcs,
1126 };
1127
1128 /* TRACE_GRAPH_RET */
1129 static enum print_line_t trace_graph_ret_trace(struct trace_iterator *iter, int flags,
1130                                         struct trace_event *event)
1131 {
1132         struct trace_seq *s = &iter->seq;
1133         struct trace_entry *entry = iter->ent;
1134         struct ftrace_graph_ret_entry *field;
1135
1136         trace_assign_type(field, entry);
1137
1138         if (!trace_seq_puts(s, "graph_ret: func="))
1139                 return TRACE_TYPE_PARTIAL_LINE;
1140
1141         if (!seq_print_ip_sym(s, field->ret.func, flags))
1142                 return TRACE_TYPE_PARTIAL_LINE;
1143
1144         if (!trace_seq_puts(s, "\n"))
1145                 return TRACE_TYPE_PARTIAL_LINE;
1146
1147         return TRACE_TYPE_HANDLED;
1148 }
1149
1150 static enum print_line_t trace_graph_ret_raw(struct trace_iterator *iter, int flags,
1151                                       struct trace_event *event)
1152 {
1153         struct ftrace_graph_ret_entry *field;
1154
1155         trace_assign_type(field, iter->ent);
1156
1157         if (!trace_seq_printf(&iter->seq, "%lx %lld %lld %ld %d\n",
1158                               field->ret.func,
1159                               field->ret.calltime,
1160                               field->ret.rettime,
1161                               field->ret.overrun,
1162                               field->ret.depth));
1163                 return TRACE_TYPE_PARTIAL_LINE;
1164
1165         return TRACE_TYPE_HANDLED;
1166 }
1167
1168 static enum print_line_t trace_graph_ret_hex(struct trace_iterator *iter, int flags,
1169                                       struct trace_event *event)
1170 {
1171         struct ftrace_graph_ret_entry *field;
1172         struct trace_seq *s = &iter->seq;
1173
1174         trace_assign_type(field, iter->ent);
1175
1176         SEQ_PUT_HEX_FIELD_RET(s, field->ret.func);
1177         SEQ_PUT_HEX_FIELD_RET(s, field->ret.calltime);
1178         SEQ_PUT_HEX_FIELD_RET(s, field->ret.rettime);
1179         SEQ_PUT_HEX_FIELD_RET(s, field->ret.overrun);
1180         SEQ_PUT_HEX_FIELD_RET(s, field->ret.depth);
1181
1182         return TRACE_TYPE_HANDLED;
1183 }
1184
1185 static enum print_line_t trace_graph_ret_bin(struct trace_iterator *iter, int flags,
1186                                       struct trace_event *event)
1187 {
1188         struct ftrace_graph_ret_entry *field;
1189         struct trace_seq *s = &iter->seq;
1190
1191         trace_assign_type(field, iter->ent);
1192
1193         SEQ_PUT_FIELD_RET(s, field->ret.func);
1194         SEQ_PUT_FIELD_RET(s, field->ret.calltime);
1195         SEQ_PUT_FIELD_RET(s, field->ret.rettime);
1196         SEQ_PUT_FIELD_RET(s, field->ret.overrun);
1197         SEQ_PUT_FIELD_RET(s, field->ret.depth);
1198
1199         return TRACE_TYPE_HANDLED;
1200 }
1201
1202 static struct trace_event_functions trace_graph_ret_funcs = {
1203         .trace          = trace_graph_ret_trace,
1204         .raw            = trace_graph_ret_raw,
1205         .hex            = trace_graph_ret_hex,
1206         .binary         = trace_graph_ret_bin,
1207 };
1208
1209 static struct trace_event trace_graph_ret_event = {
1210         .type           = TRACE_GRAPH_RET,
1211         .funcs          = &trace_graph_ret_funcs,
1212 };
1213
1214 /* TRACE_CTX an TRACE_WAKE */
1215 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1216                                              char *delim)
1217 {
1218         struct ctx_switch_entry *field;
1219         char comm[TASK_COMM_LEN];
1220         int S, T;
1221
1222
1223         trace_assign_type(field, iter->ent);
1224
1225         T = task_state_char(field->next_state);
1226         S = task_state_char(field->prev_state);
1227         trace_find_cmdline(field->next_pid, comm);
1228         if (!trace_seq_printf(&iter->seq,
1229                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
1230                               field->prev_pid,
1231                               field->prev_prio,
1232                               S, delim,
1233                               field->next_cpu,
1234                               field->next_pid,
1235                               field->next_prio,
1236                               T, comm))
1237                 return TRACE_TYPE_PARTIAL_LINE;
1238
1239         return TRACE_TYPE_HANDLED;
1240 }
1241
1242 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1243                                          struct trace_event *event)
1244 {
1245         return trace_ctxwake_print(iter, "==>");
1246 }
1247
1248 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1249                                           int flags, struct trace_event *event)
1250 {
1251         return trace_ctxwake_print(iter, "  +");
1252 }
1253
1254 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1255 {
1256         struct ctx_switch_entry *field;
1257         int T;
1258
1259         trace_assign_type(field, iter->ent);
1260
1261         if (!S)
1262                 S = task_state_char(field->prev_state);
1263         T = task_state_char(field->next_state);
1264         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1265                               field->prev_pid,
1266                               field->prev_prio,
1267                               S,
1268                               field->next_cpu,
1269                               field->next_pid,
1270                               field->next_prio,
1271                               T))
1272                 return TRACE_TYPE_PARTIAL_LINE;
1273
1274         return TRACE_TYPE_HANDLED;
1275 }
1276
1277 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1278                                        struct trace_event *event)
1279 {
1280         return trace_ctxwake_raw(iter, 0);
1281 }
1282
1283 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1284                                         struct trace_event *event)
1285 {
1286         return trace_ctxwake_raw(iter, '+');
1287 }
1288
1289
1290 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1291 {
1292         struct ctx_switch_entry *field;
1293         struct trace_seq *s = &iter->seq;
1294         int T;
1295
1296         trace_assign_type(field, iter->ent);
1297
1298         if (!S)
1299                 S = task_state_char(field->prev_state);
1300         T = task_state_char(field->next_state);
1301
1302         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1303         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1304         SEQ_PUT_HEX_FIELD_RET(s, S);
1305         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1306         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1307         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1308         SEQ_PUT_HEX_FIELD_RET(s, T);
1309
1310         return TRACE_TYPE_HANDLED;
1311 }
1312
1313 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1314                                        struct trace_event *event)
1315 {
1316         return trace_ctxwake_hex(iter, 0);
1317 }
1318
1319 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1320                                         struct trace_event *event)
1321 {
1322         return trace_ctxwake_hex(iter, '+');
1323 }
1324
1325 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1326                                            int flags, struct trace_event *event)
1327 {
1328         struct ctx_switch_entry *field;
1329         struct trace_seq *s = &iter->seq;
1330
1331         trace_assign_type(field, iter->ent);
1332
1333         SEQ_PUT_FIELD_RET(s, field->prev_pid);
1334         SEQ_PUT_FIELD_RET(s, field->prev_prio);
1335         SEQ_PUT_FIELD_RET(s, field->prev_state);
1336         SEQ_PUT_FIELD_RET(s, field->next_pid);
1337         SEQ_PUT_FIELD_RET(s, field->next_prio);
1338         SEQ_PUT_FIELD_RET(s, field->next_state);
1339
1340         return TRACE_TYPE_HANDLED;
1341 }
1342
1343 static struct trace_event_functions trace_ctx_funcs = {
1344         .trace          = trace_ctx_print,
1345         .raw            = trace_ctx_raw,
1346         .hex            = trace_ctx_hex,
1347         .binary         = trace_ctxwake_bin,
1348 };
1349
1350 static struct trace_event trace_ctx_event = {
1351         .type           = TRACE_CTX,
1352         .funcs          = &trace_ctx_funcs,
1353 };
1354
1355 static struct trace_event_functions trace_wake_funcs = {
1356         .trace          = trace_wake_print,
1357         .raw            = trace_wake_raw,
1358         .hex            = trace_wake_hex,
1359         .binary         = trace_ctxwake_bin,
1360 };
1361
1362 static struct trace_event trace_wake_event = {
1363         .type           = TRACE_WAKE,
1364         .funcs          = &trace_wake_funcs,
1365 };
1366
1367 /* TRACE_STACK */
1368
1369 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1370                                            int flags, struct trace_event *event)
1371 {
1372         struct stack_entry *field;
1373         struct trace_seq *s = &iter->seq;
1374         unsigned long *p;
1375         unsigned long *end;
1376
1377         trace_assign_type(field, iter->ent);
1378         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1379
1380         if (!trace_seq_puts(s, "<stack trace>\n"))
1381                 goto partial;
1382
1383         for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1384                 if (!trace_seq_puts(s, " => "))
1385                         goto partial;
1386
1387                 if (!seq_print_ip_sym(s, *p, flags))
1388                         goto partial;
1389                 if (!trace_seq_puts(s, "\n"))
1390                         goto partial;
1391         }
1392
1393         return TRACE_TYPE_HANDLED;
1394
1395  partial:
1396         return TRACE_TYPE_PARTIAL_LINE;
1397 }
1398
1399 static struct trace_event_functions trace_stack_funcs = {
1400         .trace          = trace_stack_print,
1401 };
1402
1403 static struct trace_event trace_stack_event = {
1404         .type           = TRACE_STACK,
1405         .funcs          = &trace_stack_funcs,
1406 };
1407
1408 /* TRACE_USER_STACK */
1409 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1410                                                 int flags, struct trace_event *event)
1411 {
1412         struct userstack_entry *field;
1413         struct trace_seq *s = &iter->seq;
1414
1415         trace_assign_type(field, iter->ent);
1416
1417         if (!trace_seq_puts(s, "<user stack trace>\n"))
1418                 goto partial;
1419
1420         if (!seq_print_userip_objs(field, s, flags))
1421                 goto partial;
1422
1423         return TRACE_TYPE_HANDLED;
1424
1425  partial:
1426         return TRACE_TYPE_PARTIAL_LINE;
1427 }
1428
1429 static struct trace_event_functions trace_user_stack_funcs = {
1430         .trace          = trace_user_stack_print,
1431 };
1432
1433 static struct trace_event trace_user_stack_event = {
1434         .type           = TRACE_USER_STACK,
1435         .funcs          = &trace_user_stack_funcs,
1436 };
1437
1438 /* TRACE_BPUTS */
1439 static enum print_line_t
1440 trace_bputs_print(struct trace_iterator *iter, int flags,
1441                    struct trace_event *event)
1442 {
1443         struct trace_entry *entry = iter->ent;
1444         struct trace_seq *s = &iter->seq;
1445         struct bputs_entry *field;
1446
1447         trace_assign_type(field, entry);
1448
1449         if (!seq_print_ip_sym(s, field->ip, flags))
1450                 goto partial;
1451
1452         if (!trace_seq_puts(s, ": "))
1453                 goto partial;
1454
1455         if (!trace_seq_puts(s, field->str))
1456                 goto partial;
1457
1458         return TRACE_TYPE_HANDLED;
1459
1460  partial:
1461         return TRACE_TYPE_PARTIAL_LINE;
1462 }
1463
1464
1465 static enum print_line_t
1466 trace_bputs_raw(struct trace_iterator *iter, int flags,
1467                 struct trace_event *event)
1468 {
1469         struct bputs_entry *field;
1470         struct trace_seq *s = &iter->seq;
1471
1472         trace_assign_type(field, iter->ent);
1473
1474         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1475                 goto partial;
1476
1477         if (!trace_seq_puts(s, field->str))
1478                 goto partial;
1479
1480         return TRACE_TYPE_HANDLED;
1481
1482  partial:
1483         return TRACE_TYPE_PARTIAL_LINE;
1484 }
1485
1486 static struct trace_event_functions trace_bputs_funcs = {
1487         .trace          = trace_bputs_print,
1488         .raw            = trace_bputs_raw,
1489 };
1490
1491 static struct trace_event trace_bputs_event = {
1492         .type           = TRACE_BPUTS,
1493         .funcs          = &trace_bputs_funcs,
1494 };
1495
1496 /* TRACE_BPRINT */
1497 static enum print_line_t
1498 trace_bprint_print(struct trace_iterator *iter, int flags,
1499                    struct trace_event *event)
1500 {
1501         struct trace_entry *entry = iter->ent;
1502         struct trace_seq *s = &iter->seq;
1503         struct bprint_entry *field;
1504
1505         trace_assign_type(field, entry);
1506
1507         if (!seq_print_ip_sym(s, field->ip, flags))
1508                 goto partial;
1509
1510         if (!trace_seq_puts(s, ": "))
1511                 goto partial;
1512
1513         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1514                 goto partial;
1515
1516         return TRACE_TYPE_HANDLED;
1517
1518  partial:
1519         return TRACE_TYPE_PARTIAL_LINE;
1520 }
1521
1522
1523 static enum print_line_t
1524 trace_bprint_raw(struct trace_iterator *iter, int flags,
1525                  struct trace_event *event)
1526 {
1527         struct bprint_entry *field;
1528         struct trace_seq *s = &iter->seq;
1529
1530         trace_assign_type(field, iter->ent);
1531
1532         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1533                 goto partial;
1534
1535         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1536                 goto partial;
1537
1538         return TRACE_TYPE_HANDLED;
1539
1540  partial:
1541         return TRACE_TYPE_PARTIAL_LINE;
1542 }
1543
1544 static struct trace_event_functions trace_bprint_funcs = {
1545         .trace          = trace_bprint_print,
1546         .raw            = trace_bprint_raw,
1547 };
1548
1549 static struct trace_event trace_bprint_event = {
1550         .type           = TRACE_BPRINT,
1551         .funcs          = &trace_bprint_funcs,
1552 };
1553
1554 /* TRACE_PRINT */
1555 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1556                                            int flags, struct trace_event *event)
1557 {
1558         struct print_entry *field;
1559         struct trace_seq *s = &iter->seq;
1560
1561         trace_assign_type(field, iter->ent);
1562
1563         if (!seq_print_ip_sym(s, field->ip, flags))
1564                 goto partial;
1565
1566         if (!trace_seq_printf(s, ": %s", field->buf))
1567                 goto partial;
1568
1569         return TRACE_TYPE_HANDLED;
1570
1571  partial:
1572         return TRACE_TYPE_PARTIAL_LINE;
1573 }
1574
1575 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1576                                          struct trace_event *event)
1577 {
1578         struct print_entry *field;
1579
1580         trace_assign_type(field, iter->ent);
1581
1582         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1583                 goto partial;
1584
1585         return TRACE_TYPE_HANDLED;
1586
1587  partial:
1588         return TRACE_TYPE_PARTIAL_LINE;
1589 }
1590
1591 static struct trace_event_functions trace_print_funcs = {
1592         .trace          = trace_print_print,
1593         .raw            = trace_print_raw,
1594 };
1595
1596 static struct trace_event trace_print_event = {
1597         .type           = TRACE_PRINT,
1598         .funcs          = &trace_print_funcs,
1599 };
1600
1601
1602 static struct trace_event *events[] __initdata = {
1603         &trace_fn_event,
1604         &trace_graph_ent_event,
1605         &trace_graph_ret_event,
1606         &trace_ctx_event,
1607         &trace_wake_event,
1608         &trace_stack_event,
1609         &trace_user_stack_event,
1610         &trace_bputs_event,
1611         &trace_bprint_event,
1612         &trace_print_event,
1613         NULL
1614 };
1615
1616 __init static int init_events(void)
1617 {
1618         struct trace_event *event;
1619         int i, ret;
1620
1621         for (i = 0; events[i]; i++) {
1622                 event = events[i];
1623
1624                 ret = register_ftrace_event(event);
1625                 if (!ret) {
1626                         printk(KERN_WARNING "event %d failed to register\n",
1627                                event->type);
1628                         WARN_ON_ONCE(1);
1629                 }
1630         }
1631
1632         return 0;
1633 }
1634 early_initcall(init_events);