git.oblomov.eu Git - linux-2.6/blob - 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 static DEFINE_MUTEX(trace_event_mutex);
  18 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  19
  20 static int next_event_type = __TRACE_LAST_TYPE + 1;
  21
  22 /**
  23  * trace_seq_printf - sequence printing of trace information
  24  * @s: trace sequence descriptor
  25  * @fmt: printf format string
  26  *
  27  * The tracer may use either sequence operations or its own
  28  * copy to user routines. To simplify formating of a trace
  29  * trace_seq_printf is used to store strings into a special
  30  * buffer (@s). Then the output may be either used by
  31  * the sequencer or pulled into another buffer.
  32  */
  33 int
  34 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  35 {
  36         int len = (PAGE_SIZE - 1) - s->len;
  37         va_list ap;
  38         int ret;
  39
  40         if (!len)
  41                 return 0;
  42
  43         va_start(ap, fmt);
  44         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  45         va_end(ap);
  46
  47         /* If we can't write it all, don't bother writing anything */
  48         if (ret >= len)
  49                 return 0;
  50
  51         s->len += ret;
  52
  53         return len;
  54 }
  55
  56 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  57 {
  58         int len = (PAGE_SIZE - 1) - s->len;
  59         int ret;
  60
  61         if (!len)
  62                 return 0;
  63
  64         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
  65
  66         /* If we can't write it all, don't bother writing anything */
  67         if (ret >= len)
  68                 return 0;
  69
  70         s->len += ret;
  71
  72         return len;
  73 }
  74
  75 /**
  76  * trace_seq_puts - trace sequence printing of simple string
  77  * @s: trace sequence descriptor
  78  * @str: simple string to record
  79  *
  80  * The tracer may use either the sequence operations or its own
  81  * copy to user routines. This function records a simple string
  82  * into a special buffer (@s) for later retrieval by a sequencer
  83  * or other mechanism.
  84  */
  85 int trace_seq_puts(struct trace_seq *s, const char *str)
  86 {
  87         int len = strlen(str);
  88
  89         if (len > ((PAGE_SIZE - 1) - s->len))
  90                 return 0;
  91
  92         memcpy(s->buffer + s->len, str, len);
  93         s->len += len;
  94
  95         return len;
  96 }
  97
  98 int trace_seq_putc(struct trace_seq *s, unsigned char c)
  99 {
 100         if (s->len >= (PAGE_SIZE - 1))
 101                 return 0;
 102
 103         s->buffer[s->len++] = c;
 104
 105         return 1;
 106 }
 107
 108 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 109 {
 110         if (len > ((PAGE_SIZE - 1) - s->len))
 111                 return 0;
 112
 113         memcpy(s->buffer + s->len, mem, len);
 114         s->len += len;
 115
 116         return len;
 117 }
 118
 119 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 120 {
 121         unsigned char hex[HEX_CHARS];
 122         unsigned char *data = mem;
 123         int i, j;
 124
 125 #ifdef __BIG_ENDIAN
 126         for (i = 0, j = 0; i < len; i++) {
 127 #else
 128         for (i = len-1, j = 0; i >= 0; i--) {
 129 #endif
 130                 hex[j++] = hex_asc_hi(data[i]);
 131                 hex[j++] = hex_asc_lo(data[i]);
 132         }
 133         hex[j++] = ' ';
 134
 135         return trace_seq_putmem(s, hex, j);
 136 }
 137
 138 int trace_seq_path(struct trace_seq *s, struct path *path)
 139 {
 140         unsigned char *p;
 141
 142         if (s->len >= (PAGE_SIZE - 1))
 143                 return 0;
 144         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 145         if (!IS_ERR(p)) {
 146                 p = mangle_path(s->buffer + s->len, p, "\n");
 147                 if (p) {
 148                         s->len = p - s->buffer;
 149                         return 1;
 150                 }
 151         } else {
 152                 s->buffer[s->len++] = '?';
 153                 return 1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 #ifdef CONFIG_KRETPROBES
 160 static inline const char *kretprobed(const char *name)
 161 {
 162         static const char tramp_name[] = "kretprobe_trampoline";
 163         int size = sizeof(tramp_name);
 164
 165         if (strncmp(tramp_name, name, size) == 0)
 166                 return "[unknown/kretprobe'd]";
 167         return name;
 168 }
 169 #else
 170 static inline const char *kretprobed(const char *name)
 171 {
 172         return name;
 173 }
 174 #endif /* CONFIG_KRETPROBES */
 175
 176 static int
 177 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 178 {
 179 #ifdef CONFIG_KALLSYMS
 180         char str[KSYM_SYMBOL_LEN];
 181         const char *name;
 182
 183         kallsyms_lookup(address, NULL, NULL, NULL, str);
 184
 185         name = kretprobed(str);
 186
 187         return trace_seq_printf(s, fmt, name);
 188 #endif
 189         return 1;
 190 }
 191
 192 static int
 193 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 194                      unsigned long address)
 195 {
 196 #ifdef CONFIG_KALLSYMS
 197         char str[KSYM_SYMBOL_LEN];
 198         const char *name;
 199
 200         sprint_symbol(str, address);
 201         name = kretprobed(str);
 202
 203         return trace_seq_printf(s, fmt, name);
 204 #endif
 205         return 1;
 206 }
 207
 208 #ifndef CONFIG_64BIT
 209 # define IP_FMT "%08lx"
 210 #else
 211 # define IP_FMT "%016lx"
 212 #endif
 213
 214 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 215                       unsigned long ip, unsigned long sym_flags)
 216 {
 217         struct file *file = NULL;
 218         unsigned long vmstart = 0;
 219         int ret = 1;
 220
 221         if (mm) {
 222                 const struct vm_area_struct *vma;
 223
 224                 down_read(&mm->mmap_sem);
 225                 vma = find_vma(mm, ip);
 226                 if (vma) {
 227                         file = vma->vm_file;
 228                         vmstart = vma->vm_start;
 229                 }
 230                 if (file) {
 231                         ret = trace_seq_path(s, &file->f_path);
 232                         if (ret)
 233                                 ret = trace_seq_printf(s, "[+0x%lx]",
 234                                                        ip - vmstart);
 235                 }
 236                 up_read(&mm->mmap_sem);
 237         }
 238         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 239                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 240         return ret;
 241 }
 242
 243 int
 244 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 245                       unsigned long sym_flags)
 246 {
 247         struct mm_struct *mm = NULL;
 248         int ret = 1;
 249         unsigned int i;
 250
 251         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 252                 struct task_struct *task;
 253                 /*
 254                  * we do the lookup on the thread group leader,
 255                  * since individual threads might have already quit!
 256                  */
 257                 rcu_read_lock();
 258                 task = find_task_by_vpid(entry->ent.tgid);
 259                 if (task)
 260                         mm = get_task_mm(task);
 261                 rcu_read_unlock();
 262         }
 263
 264         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 265                 unsigned long ip = entry->caller[i];
 266
 267                 if (ip == ULONG_MAX || !ret)
 268                         break;
 269                 if (i && ret)
 270                         ret = trace_seq_puts(s, " <- ");
 271                 if (!ip) {
 272                         if (ret)
 273                                 ret = trace_seq_puts(s, "??");
 274                         continue;
 275                 }
 276                 if (!ret)
 277                         break;
 278                 if (ret)
 279                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 280         }
 281
 282         if (mm)
 283                 mmput(mm);
 284         return ret;
 285 }
 286
 287 int
 288 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 289 {
 290         int ret;
 291
 292         if (!ip)
 293                 return trace_seq_printf(s, "0");
 294
 295         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 296                 ret = seq_print_sym_offset(s, "%s", ip);
 297         else
 298                 ret = seq_print_sym_short(s, "%s", ip);
 299
 300         if (!ret)
 301                 return 0;
 302
 303         if (sym_flags & TRACE_ITER_SYM_ADDR)
 304                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 305         return ret;
 306 }
 307
 308 static int
 309 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 310 {
 311         int hardirq, softirq;
 312         char comm[TASK_COMM_LEN];
 313
 314         trace_find_cmdline(entry->pid, comm);
 315         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 316         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 317
 318         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 319                               comm, entry->pid, cpu,
 320                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 321                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 322                                   'X' : '.',
 323                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 324                                 'N' : '.',
 325                               (hardirq && softirq) ? 'H' :
 326                                 hardirq ? 'h' : softirq ? 's' : '.'))
 327                 return 0;
 328
 329         if (entry->preempt_count)
 330                 return trace_seq_printf(s, "%x", entry->preempt_count);
 331         return trace_seq_puts(s, ".");
 332 }
 333
 334 static unsigned long preempt_mark_thresh = 100;
 335
 336 static int
 337 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 338                     unsigned long rel_usecs)
 339 {
 340         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 341                                 rel_usecs > preempt_mark_thresh ? '!' :
 342                                   rel_usecs > 1 ? '+' : ' ');
 343 }
 344
 345 int trace_print_context(struct trace_iterator *iter)
 346 {
 347         struct trace_seq *s = &iter->seq;
 348         struct trace_entry *entry = iter->ent;
 349         unsigned long long t = ns2usecs(iter->ts);
 350         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 351         unsigned long secs = (unsigned long)t;
 352         char comm[TASK_COMM_LEN];
 353
 354         trace_find_cmdline(entry->pid, comm);
 355
 356         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 357                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 358 }
 359
 360 int trace_print_lat_context(struct trace_iterator *iter)
 361 {
 362         u64 next_ts;
 363         int ret;
 364         struct trace_seq *s = &iter->seq;
 365         struct trace_entry *entry = iter->ent,
 366                            *next_entry = trace_find_next_entry(iter, NULL,
 367                                                                &next_ts);
 368         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 369         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 370         unsigned long rel_usecs;
 371
 372         if (!next_entry)
 373                 next_ts = iter->ts;
 374         rel_usecs = ns2usecs(next_ts - iter->ts);
 375
 376         if (verbose) {
 377                 char comm[TASK_COMM_LEN];
 378
 379                 trace_find_cmdline(entry->pid, comm);
 380
 381                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 382                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 383                                        entry->pid, iter->cpu, entry->flags,
 384                                        entry->preempt_count, iter->idx,
 385                                        ns2usecs(iter->ts),
 386                                        abs_usecs / USEC_PER_MSEC,
 387                                        abs_usecs % USEC_PER_MSEC,
 388                                        rel_usecs / USEC_PER_MSEC,
 389                                        rel_usecs % USEC_PER_MSEC);
 390         } else {
 391                 ret = lat_print_generic(s, entry, iter->cpu);
 392                 if (ret)
 393                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 394         }
 395
 396         return ret;
 397 }
 398
 399 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 400
 401 static int task_state_char(unsigned long state)
 402 {
 403         int bit = state ? __ffs(state) + 1 : 0;
 404
 405         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 406 }
 407
 408 /**
 409  * ftrace_find_event - find a registered event
 410  * @type: the type of event to look for
 411  *
 412  * Returns an event of type @type otherwise NULL
 413  */
 414 struct trace_event *ftrace_find_event(int type)
 415 {
 416         struct trace_event *event;
 417         struct hlist_node *n;
 418         unsigned key;
 419
 420         key = type & (EVENT_HASHSIZE - 1);
 421
 422         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 423                 if (event->type == type)
 424                         return event;
 425         }
 426
 427         return NULL;
 428 }
 429
 430 /**
 431  * register_ftrace_event - register output for an event type
 432  * @event: the event type to register
 433  *
 434  * Event types are stored in a hash and this hash is used to
 435  * find a way to print an event. If the @event->type is set
 436  * then it will use that type, otherwise it will assign a
 437  * type to use.
 438  *
 439  * If you assign your own type, please make sure it is added
 440  * to the trace_type enum in trace.h, to avoid collisions
 441  * with the dynamic types.
 442  *
 443  * Returns the event type number or zero on error.
 444  */
 445 int register_ftrace_event(struct trace_event *event)
 446 {
 447         unsigned key;
 448         int ret = 0;
 449
 450         mutex_lock(&trace_event_mutex);
 451
 452         if (!event->type)
 453                 event->type = next_event_type++;
 454         else if (event->type > __TRACE_LAST_TYPE) {
 455                 printk(KERN_WARNING "Need to add type to trace.h\n");
 456                 WARN_ON(1);
 457         }
 458
 459         if (ftrace_find_event(event->type))
 460                 goto out;
 461
 462         if (event->trace == NULL)
 463                 event->trace = trace_nop_print;
 464         if (event->raw == NULL)
 465                 event->raw = trace_nop_print;
 466         if (event->hex == NULL)
 467                 event->hex = trace_nop_print;
 468         if (event->binary == NULL)
 469                 event->binary = trace_nop_print;
 470
 471         key = event->type & (EVENT_HASHSIZE - 1);
 472
 473         hlist_add_head_rcu(&event->node, &event_hash[key]);
 474
 475         ret = event->type;
 476  out:
 477         mutex_unlock(&trace_event_mutex);
 478
 479         return ret;
 480 }
 481
 482 /**
 483  * unregister_ftrace_event - remove a no longer used event
 484  * @event: the event to remove
 485  */
 486 int unregister_ftrace_event(struct trace_event *event)
 487 {
 488         mutex_lock(&trace_event_mutex);
 489         hlist_del(&event->node);
 490         mutex_unlock(&trace_event_mutex);
 491
 492         return 0;
 493 }
 494
 495 /*
 496  * Standard events
 497  */
 498
 499 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 500 {
 501         return TRACE_TYPE_HANDLED;
 502 }
 503
 504 /* TRACE_FN */
 505 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 506 {
 507         struct ftrace_entry *field;
 508         struct trace_seq *s = &iter->seq;
 509
 510         trace_assign_type(field, iter->ent);
 511
 512         if (!seq_print_ip_sym(s, field->ip, flags))
 513                 goto partial;
 514
 515         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 516                 if (!trace_seq_printf(s, " <-"))
 517                         goto partial;
 518                 if (!seq_print_ip_sym(s,
 519                                       field->parent_ip,
 520                                       flags))
 521                         goto partial;
 522         }
 523         if (!trace_seq_printf(s, "\n"))
 524                 goto partial;
 525
 526         return TRACE_TYPE_HANDLED;
 527
 528  partial:
 529         return TRACE_TYPE_PARTIAL_LINE;
 530 }
 531
 532 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 533 {
 534         struct ftrace_entry *field;
 535
 536         trace_assign_type(field, iter->ent);
 537
 538         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 539                               field->ip,
 540                               field->parent_ip))
 541                 return TRACE_TYPE_PARTIAL_LINE;
 542
 543         return TRACE_TYPE_HANDLED;
 544 }
 545
 546 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 547 {
 548         struct ftrace_entry *field;
 549         struct trace_seq *s = &iter->seq;
 550
 551         trace_assign_type(field, iter->ent);
 552
 553         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 554         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 555
 556         return TRACE_TYPE_HANDLED;
 557 }
 558
 559 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 560 {
 561         struct ftrace_entry *field;
 562         struct trace_seq *s = &iter->seq;
 563
 564         trace_assign_type(field, iter->ent);
 565
 566         SEQ_PUT_FIELD_RET(s, field->ip);
 567         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 568
 569         return TRACE_TYPE_HANDLED;
 570 }
 571
 572 static struct trace_event trace_fn_event = {
 573         .type           = TRACE_FN,
 574         .trace          = trace_fn_trace,
 575         .raw            = trace_fn_raw,
 576         .hex            = trace_fn_hex,
 577         .binary         = trace_fn_bin,
 578 };
 579
 580 /* TRACE_CTX an TRACE_WAKE */
 581 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 582                                              char *delim)
 583 {
 584         struct ctx_switch_entry *field;
 585         char comm[TASK_COMM_LEN];
 586         int S, T;
 587
 588
 589         trace_assign_type(field, iter->ent);
 590
 591         T = task_state_char(field->next_state);
 592         S = task_state_char(field->prev_state);
 593         trace_find_cmdline(field->next_pid, comm);
 594         if (!trace_seq_printf(&iter->seq,
 595                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 596                               field->prev_pid,
 597                               field->prev_prio,
 598                               S, delim,
 599                               field->next_cpu,
 600                               field->next_pid,
 601                               field->next_prio,
 602                               T, comm))
 603                 return TRACE_TYPE_PARTIAL_LINE;
 604
 605         return TRACE_TYPE_HANDLED;
 606 }
 607
 608 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 609 {
 610         return trace_ctxwake_print(iter, "==>");
 611 }
 612
 613 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 614                                           int flags)
 615 {
 616         return trace_ctxwake_print(iter, "  +");
 617 }
 618
 619 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 620 {
 621         struct ctx_switch_entry *field;
 622         int T;
 623
 624         trace_assign_type(field, iter->ent);
 625
 626         if (!S)
 627                 task_state_char(field->prev_state);
 628         T = task_state_char(field->next_state);
 629         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 630                               field->prev_pid,
 631                               field->prev_prio,
 632                               S,
 633                               field->next_cpu,
 634                               field->next_pid,
 635                               field->next_prio,
 636                               T))
 637                 return TRACE_TYPE_PARTIAL_LINE;
 638
 639         return TRACE_TYPE_HANDLED;
 640 }
 641
 642 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 643 {
 644         return trace_ctxwake_raw(iter, 0);
 645 }
 646
 647 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 648 {
 649         return trace_ctxwake_raw(iter, '+');
 650 }
 651
 652
 653 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 654 {
 655         struct ctx_switch_entry *field;
 656         struct trace_seq *s = &iter->seq;
 657         int T;
 658
 659         trace_assign_type(field, iter->ent);
 660
 661         if (!S)
 662                 task_state_char(field->prev_state);
 663         T = task_state_char(field->next_state);
 664
 665         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 666         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 667         SEQ_PUT_HEX_FIELD_RET(s, S);
 668         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 669         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 670         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 671         SEQ_PUT_HEX_FIELD_RET(s, T);
 672
 673         return TRACE_TYPE_HANDLED;
 674 }
 675
 676 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 677 {
 678         return trace_ctxwake_hex(iter, 0);
 679 }
 680
 681 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 682 {
 683         return trace_ctxwake_hex(iter, '+');
 684 }
 685
 686 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 687                                            int flags)
 688 {
 689         struct ctx_switch_entry *field;
 690         struct trace_seq *s = &iter->seq;
 691
 692         trace_assign_type(field, iter->ent);
 693
 694         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 695         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 696         SEQ_PUT_FIELD_RET(s, field->prev_state);
 697         SEQ_PUT_FIELD_RET(s, field->next_pid);
 698         SEQ_PUT_FIELD_RET(s, field->next_prio);
 699         SEQ_PUT_FIELD_RET(s, field->next_state);
 700
 701         return TRACE_TYPE_HANDLED;
 702 }
 703
 704 static struct trace_event trace_ctx_event = {
 705         .type           = TRACE_CTX,
 706         .trace          = trace_ctx_print,
 707         .raw            = trace_ctx_raw,
 708         .hex            = trace_ctx_hex,
 709         .binary         = trace_ctxwake_bin,
 710 };
 711
 712 static struct trace_event trace_wake_event = {
 713         .type           = TRACE_WAKE,
 714         .trace          = trace_wake_print,
 715         .raw            = trace_wake_raw,
 716         .hex            = trace_wake_hex,
 717         .binary         = trace_ctxwake_bin,
 718 };
 719
 720 /* TRACE_SPECIAL */
 721 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 722                                              int flags)
 723 {
 724         struct special_entry *field;
 725
 726         trace_assign_type(field, iter->ent);
 727
 728         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 729                               field->arg1,
 730                               field->arg2,
 731                               field->arg3))
 732                 return TRACE_TYPE_PARTIAL_LINE;
 733
 734         return TRACE_TYPE_HANDLED;
 735 }
 736
 737 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 738                                            int flags)
 739 {
 740         struct special_entry *field;
 741         struct trace_seq *s = &iter->seq;
 742
 743         trace_assign_type(field, iter->ent);
 744
 745         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 746         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 747         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 748
 749         return TRACE_TYPE_HANDLED;
 750 }
 751
 752 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 753                                            int flags)
 754 {
 755         struct special_entry *field;
 756         struct trace_seq *s = &iter->seq;
 757
 758         trace_assign_type(field, iter->ent);
 759
 760         SEQ_PUT_FIELD_RET(s, field->arg1);
 761         SEQ_PUT_FIELD_RET(s, field->arg2);
 762         SEQ_PUT_FIELD_RET(s, field->arg3);
 763
 764         return TRACE_TYPE_HANDLED;
 765 }
 766
 767 static struct trace_event trace_special_event = {
 768         .type           = TRACE_SPECIAL,
 769         .trace          = trace_special_print,
 770         .raw            = trace_special_print,
 771         .hex            = trace_special_hex,
 772         .binary         = trace_special_bin,
 773 };
 774
 775 /* TRACE_STACK */
 776
 777 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 778                                            int flags)
 779 {
 780         struct stack_entry *field;
 781         struct trace_seq *s = &iter->seq;
 782         int i;
 783
 784         trace_assign_type(field, iter->ent);
 785
 786         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 787                 if (i) {
 788                         if (!trace_seq_puts(s, " <= "))
 789                                 goto partial;
 790
 791                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 792                                 goto partial;
 793                 }
 794                 if (!trace_seq_puts(s, "\n"))
 795                         goto partial;
 796         }
 797
 798         return TRACE_TYPE_HANDLED;
 799
 800  partial:
 801         return TRACE_TYPE_PARTIAL_LINE;
 802 }
 803
 804 static struct trace_event trace_stack_event = {
 805         .type           = TRACE_STACK,
 806         .trace          = trace_stack_print,
 807         .raw            = trace_special_print,
 808         .hex            = trace_special_hex,
 809         .binary         = trace_special_bin,
 810 };
 811
 812 /* TRACE_USER_STACK */
 813 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 814                                                 int flags)
 815 {
 816         struct userstack_entry *field;
 817         struct trace_seq *s = &iter->seq;
 818
 819         trace_assign_type(field, iter->ent);
 820
 821         if (!seq_print_userip_objs(field, s, flags))
 822                 goto partial;
 823
 824         if (!trace_seq_putc(s, '\n'))
 825                 goto partial;
 826
 827         return TRACE_TYPE_HANDLED;
 828
 829  partial:
 830         return TRACE_TYPE_PARTIAL_LINE;
 831 }
 832
 833 static struct trace_event trace_user_stack_event = {
 834         .type           = TRACE_USER_STACK,
 835         .trace          = trace_user_stack_print,
 836         .raw            = trace_special_print,
 837         .hex            = trace_special_hex,
 838         .binary         = trace_special_bin,
 839 };
 840
 841 /* TRACE_BPRINT */
 842 static enum print_line_t
 843 trace_bprint_print(struct trace_iterator *iter, int flags)
 844 {
 845         struct trace_entry *entry = iter->ent;
 846         struct trace_seq *s = &iter->seq;
 847         struct bprint_entry *field;
 848
 849         trace_assign_type(field, entry);
 850
 851         if (!seq_print_ip_sym(s, field->ip, flags))
 852                 goto partial;
 853
 854         if (!trace_seq_puts(s, ": "))
 855                 goto partial;
 856
 857         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 858                 goto partial;
 859
 860         return TRACE_TYPE_HANDLED;
 861
 862  partial:
 863         return TRACE_TYPE_PARTIAL_LINE;
 864 }
 865
 866
 867 static enum print_line_t
 868 trace_bprint_raw(struct trace_iterator *iter, int flags)
 869 {
 870         struct bprint_entry *field;
 871         struct trace_seq *s = &iter->seq;
 872
 873         trace_assign_type(field, iter->ent);
 874
 875         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 876                 goto partial;
 877
 878         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 879                 goto partial;
 880
 881         return TRACE_TYPE_HANDLED;
 882
 883  partial:
 884         return TRACE_TYPE_PARTIAL_LINE;
 885 }
 886
 887
 888 static struct trace_event trace_bprint_event = {
 889         .type           = TRACE_BPRINT,
 890         .trace          = trace_bprint_print,
 891         .raw            = trace_bprint_raw,
 892 };
 893
 894 /* TRACE_PRINT */
 895 static enum print_line_t trace_print_print(struct trace_iterator *iter,
 896                                            int flags)
 897 {
 898         struct print_entry *field;
 899         struct trace_seq *s = &iter->seq;
 900
 901         trace_assign_type(field, iter->ent);
 902
 903         if (!seq_print_ip_sym(s, field->ip, flags))
 904                 goto partial;
 905
 906         if (!trace_seq_printf(s, ": %s", field->buf))
 907                 goto partial;
 908
 909         return TRACE_TYPE_HANDLED;
 910
 911  partial:
 912         return TRACE_TYPE_PARTIAL_LINE;
 913 }
 914
 915 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 916 {
 917         struct print_entry *field;
 918
 919         trace_assign_type(field, iter->ent);
 920
 921         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 922                 goto partial;
 923
 924         return TRACE_TYPE_HANDLED;
 925
 926  partial:
 927         return TRACE_TYPE_PARTIAL_LINE;
 928 }
 929
 930 static struct trace_event trace_print_event = {
 931         .type           = TRACE_PRINT,
 932         .trace          = trace_print_print,
 933         .raw            = trace_print_raw,
 934 };
 935
 936
 937 static struct trace_event *events[] __initdata = {
 938         &trace_fn_event,
 939         &trace_ctx_event,
 940         &trace_wake_event,
 941         &trace_special_event,
 942         &trace_stack_event,
 943         &trace_user_stack_event,
 944         &trace_bprint_event,
 945         &trace_print_event,
 946         NULL
 947 };
 948
 949 __init static int init_events(void)
 950 {
 951         struct trace_event *event;
 952         int i, ret;
 953
 954         for (i = 0; events[i]; i++) {
 955                 event = events[i];
 956
 957                 ret = register_ftrace_event(event);
 958                 if (!ret) {
 959                         printk(KERN_WARNING "event %d failed to register\n",
 960                                event->type);
 961                         WARN_ON_ONCE(1);
 962                 }
 963         }
 964
 965         return 0;
 966 }
 967 device_initcall(init_events);