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