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   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 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  23 {
  24         struct trace_seq *s = &iter->seq;
  25         struct trace_entry *entry = iter->ent;
  26         struct bprint_entry *field;
  27         int ret;
  28
  29         trace_assign_type(field, entry);
  30
  31         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  32         if (!ret)
  33                 return TRACE_TYPE_PARTIAL_LINE;
  34
  35         return TRACE_TYPE_HANDLED;
  36 }
  37
  38 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  39 {
  40         struct trace_seq *s = &iter->seq;
  41         struct trace_entry *entry = iter->ent;
  42         struct print_entry *field;
  43         int ret;
  44
  45         trace_assign_type(field, entry);
  46
  47         ret = trace_seq_printf(s, "%s", field->buf);
  48         if (!ret)
  49                 return TRACE_TYPE_PARTIAL_LINE;
  50
  51         return TRACE_TYPE_HANDLED;
  52 }
  53
  54 /**
  55  * trace_seq_printf - sequence printing of trace information
  56  * @s: trace sequence descriptor
  57  * @fmt: printf format string
  58  *
  59  * The tracer may use either sequence operations or its own
  60  * copy to user routines. To simplify formating of a trace
  61  * trace_seq_printf is used to store strings into a special
  62  * buffer (@s). Then the output may be either used by
  63  * the sequencer or pulled into another buffer.
  64  */
  65 int
  66 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  67 {
  68         int len = (PAGE_SIZE - 1) - s->len;
  69         va_list ap;
  70         int ret;
  71
  72         if (!len)
  73                 return 0;
  74
  75         va_start(ap, fmt);
  76         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  77         va_end(ap);
  78
  79         /* If we can't write it all, don't bother writing anything */
  80         if (ret >= len)
  81                 return 0;
  82
  83         s->len += ret;
  84
  85         return len;
  86 }
  87
  88 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  89 {
  90         int len = (PAGE_SIZE - 1) - s->len;
  91         int ret;
  92
  93         if (!len)
  94                 return 0;
  95
  96         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
  97
  98         /* If we can't write it all, don't bother writing anything */
  99         if (ret >= len)
 100                 return 0;
 101
 102         s->len += ret;
 103
 104         return len;
 105 }
 106
 107 /**
 108  * trace_seq_puts - trace sequence printing of simple string
 109  * @s: trace sequence descriptor
 110  * @str: simple string to record
 111  *
 112  * The tracer may use either the sequence operations or its own
 113  * copy to user routines. This function records a simple string
 114  * into a special buffer (@s) for later retrieval by a sequencer
 115  * or other mechanism.
 116  */
 117 int trace_seq_puts(struct trace_seq *s, const char *str)
 118 {
 119         int len = strlen(str);
 120
 121         if (len > ((PAGE_SIZE - 1) - s->len))
 122                 return 0;
 123
 124         memcpy(s->buffer + s->len, str, len);
 125         s->len += len;
 126
 127         return len;
 128 }
 129
 130 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 131 {
 132         if (s->len >= (PAGE_SIZE - 1))
 133                 return 0;
 134
 135         s->buffer[s->len++] = c;
 136
 137         return 1;
 138 }
 139
 140 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 141 {
 142         if (len > ((PAGE_SIZE - 1) - s->len))
 143                 return 0;
 144
 145         memcpy(s->buffer + s->len, mem, len);
 146         s->len += len;
 147
 148         return len;
 149 }
 150
 151 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 152 {
 153         unsigned char hex[HEX_CHARS];
 154         unsigned char *data = mem;
 155         int i, j;
 156
 157 #ifdef __BIG_ENDIAN
 158         for (i = 0, j = 0; i < len; i++) {
 159 #else
 160         for (i = len-1, j = 0; i >= 0; i--) {
 161 #endif
 162                 hex[j++] = hex_asc_hi(data[i]);
 163                 hex[j++] = hex_asc_lo(data[i]);
 164         }
 165         hex[j++] = ' ';
 166
 167         return trace_seq_putmem(s, hex, j);
 168 }
 169
 170 int trace_seq_path(struct trace_seq *s, struct path *path)
 171 {
 172         unsigned char *p;
 173
 174         if (s->len >= (PAGE_SIZE - 1))
 175                 return 0;
 176         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 177         if (!IS_ERR(p)) {
 178                 p = mangle_path(s->buffer + s->len, p, "\n");
 179                 if (p) {
 180                         s->len = p - s->buffer;
 181                         return 1;
 182                 }
 183         } else {
 184                 s->buffer[s->len++] = '?';
 185                 return 1;
 186         }
 187
 188         return 0;
 189 }
 190
 191 #ifdef CONFIG_KRETPROBES
 192 static inline const char *kretprobed(const char *name)
 193 {
 194         static const char tramp_name[] = "kretprobe_trampoline";
 195         int size = sizeof(tramp_name);
 196
 197         if (strncmp(tramp_name, name, size) == 0)
 198                 return "[unknown/kretprobe'd]";
 199         return name;
 200 }
 201 #else
 202 static inline const char *kretprobed(const char *name)
 203 {
 204         return name;
 205 }
 206 #endif /* CONFIG_KRETPROBES */
 207
 208 static int
 209 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 210 {
 211 #ifdef CONFIG_KALLSYMS
 212         char str[KSYM_SYMBOL_LEN];
 213         const char *name;
 214
 215         kallsyms_lookup(address, NULL, NULL, NULL, str);
 216
 217         name = kretprobed(str);
 218
 219         return trace_seq_printf(s, fmt, name);
 220 #endif
 221         return 1;
 222 }
 223
 224 static int
 225 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 226                      unsigned long address)
 227 {
 228 #ifdef CONFIG_KALLSYMS
 229         char str[KSYM_SYMBOL_LEN];
 230         const char *name;
 231
 232         sprint_symbol(str, address);
 233         name = kretprobed(str);
 234
 235         return trace_seq_printf(s, fmt, name);
 236 #endif
 237         return 1;
 238 }
 239
 240 #ifndef CONFIG_64BIT
 241 # define IP_FMT "%08lx"
 242 #else
 243 # define IP_FMT "%016lx"
 244 #endif
 245
 246 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 247                       unsigned long ip, unsigned long sym_flags)
 248 {
 249         struct file *file = NULL;
 250         unsigned long vmstart = 0;
 251         int ret = 1;
 252
 253         if (mm) {
 254                 const struct vm_area_struct *vma;
 255
 256                 down_read(&mm->mmap_sem);
 257                 vma = find_vma(mm, ip);
 258                 if (vma) {
 259                         file = vma->vm_file;
 260                         vmstart = vma->vm_start;
 261                 }
 262                 if (file) {
 263                         ret = trace_seq_path(s, &file->f_path);
 264                         if (ret)
 265                                 ret = trace_seq_printf(s, "[+0x%lx]",
 266                                                        ip - vmstart);
 267                 }
 268                 up_read(&mm->mmap_sem);
 269         }
 270         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 271                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 272         return ret;
 273 }
 274
 275 int
 276 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 277                       unsigned long sym_flags)
 278 {
 279         struct mm_struct *mm = NULL;
 280         int ret = 1;
 281         unsigned int i;
 282
 283         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 284                 struct task_struct *task;
 285                 /*
 286                  * we do the lookup on the thread group leader,
 287                  * since individual threads might have already quit!
 288                  */
 289                 rcu_read_lock();
 290                 task = find_task_by_vpid(entry->ent.tgid);
 291                 if (task)
 292                         mm = get_task_mm(task);
 293                 rcu_read_unlock();
 294         }
 295
 296         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 297                 unsigned long ip = entry->caller[i];
 298
 299                 if (ip == ULONG_MAX || !ret)
 300                         break;
 301                 if (i && ret)
 302                         ret = trace_seq_puts(s, " <- ");
 303                 if (!ip) {
 304                         if (ret)
 305                                 ret = trace_seq_puts(s, "??");
 306                         continue;
 307                 }
 308                 if (!ret)
 309                         break;
 310                 if (ret)
 311                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 312         }
 313
 314         if (mm)
 315                 mmput(mm);
 316         return ret;
 317 }
 318
 319 int
 320 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 321 {
 322         int ret;
 323
 324         if (!ip)
 325                 return trace_seq_printf(s, "0");
 326
 327         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 328                 ret = seq_print_sym_offset(s, "%s", ip);
 329         else
 330                 ret = seq_print_sym_short(s, "%s", ip);
 331
 332         if (!ret)
 333                 return 0;
 334
 335         if (sym_flags & TRACE_ITER_SYM_ADDR)
 336                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 337         return ret;
 338 }
 339
 340 static int
 341 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 342 {
 343         int hardirq, softirq;
 344         char comm[TASK_COMM_LEN];
 345
 346         trace_find_cmdline(entry->pid, comm);
 347         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 348         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 349
 350         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 351                               comm, entry->pid, cpu,
 352                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 353                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 354                                   'X' : '.',
 355                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 356                                 'N' : '.',
 357                               (hardirq && softirq) ? 'H' :
 358                                 hardirq ? 'h' : softirq ? 's' : '.'))
 359                 return 0;
 360
 361         if (entry->preempt_count)
 362                 return trace_seq_printf(s, "%x", entry->preempt_count);
 363         return trace_seq_puts(s, ".");
 364 }
 365
 366 static unsigned long preempt_mark_thresh = 100;
 367
 368 static int
 369 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 370                     unsigned long rel_usecs)
 371 {
 372         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 373                                 rel_usecs > preempt_mark_thresh ? '!' :
 374                                   rel_usecs > 1 ? '+' : ' ');
 375 }
 376
 377 int trace_print_context(struct trace_iterator *iter)
 378 {
 379         struct trace_seq *s = &iter->seq;
 380         struct trace_entry *entry = iter->ent;
 381         unsigned long long t = ns2usecs(iter->ts);
 382         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 383         unsigned long secs = (unsigned long)t;
 384         char comm[TASK_COMM_LEN];
 385
 386         trace_find_cmdline(entry->pid, comm);
 387
 388         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 389                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 390 }
 391
 392 int trace_print_lat_context(struct trace_iterator *iter)
 393 {
 394         u64 next_ts;
 395         int ret;
 396         struct trace_seq *s = &iter->seq;
 397         struct trace_entry *entry = iter->ent,
 398                            *next_entry = trace_find_next_entry(iter, NULL,
 399                                                                &next_ts);
 400         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 401         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 402         unsigned long rel_usecs;
 403
 404         if (!next_entry)
 405                 next_ts = iter->ts;
 406         rel_usecs = ns2usecs(next_ts - iter->ts);
 407
 408         if (verbose) {
 409                 char comm[TASK_COMM_LEN];
 410
 411                 trace_find_cmdline(entry->pid, comm);
 412
 413                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 414                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 415                                        entry->pid, iter->cpu, entry->flags,
 416                                        entry->preempt_count, iter->idx,
 417                                        ns2usecs(iter->ts),
 418                                        abs_usecs / USEC_PER_MSEC,
 419                                        abs_usecs % USEC_PER_MSEC,
 420                                        rel_usecs / USEC_PER_MSEC,
 421                                        rel_usecs % USEC_PER_MSEC);
 422         } else {
 423                 ret = lat_print_generic(s, entry, iter->cpu);
 424                 if (ret)
 425                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 426         }
 427
 428         return ret;
 429 }
 430
 431 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 432
 433 static int task_state_char(unsigned long state)
 434 {
 435         int bit = state ? __ffs(state) + 1 : 0;
 436
 437         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 438 }
 439
 440 /**
 441  * ftrace_find_event - find a registered event
 442  * @type: the type of event to look for
 443  *
 444  * Returns an event of type @type otherwise NULL
 445  */
 446 struct trace_event *ftrace_find_event(int type)
 447 {
 448         struct trace_event *event;
 449         struct hlist_node *n;
 450         unsigned key;
 451
 452         key = type & (EVENT_HASHSIZE - 1);
 453
 454         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 455                 if (event->type == type)
 456                         return event;
 457         }
 458
 459         return NULL;
 460 }
 461
 462 /**
 463  * register_ftrace_event - register output for an event type
 464  * @event: the event type to register
 465  *
 466  * Event types are stored in a hash and this hash is used to
 467  * find a way to print an event. If the @event->type is set
 468  * then it will use that type, otherwise it will assign a
 469  * type to use.
 470  *
 471  * If you assign your own type, please make sure it is added
 472  * to the trace_type enum in trace.h, to avoid collisions
 473  * with the dynamic types.
 474  *
 475  * Returns the event type number or zero on error.
 476  */
 477 int register_ftrace_event(struct trace_event *event)
 478 {
 479         unsigned key;
 480         int ret = 0;
 481
 482         mutex_lock(&trace_event_mutex);
 483
 484         if (!event->type)
 485                 event->type = next_event_type++;
 486         else if (event->type > __TRACE_LAST_TYPE) {
 487                 printk(KERN_WARNING "Need to add type to trace.h\n");
 488                 WARN_ON(1);
 489         }
 490
 491         if (ftrace_find_event(event->type))
 492                 goto out;
 493
 494         if (event->trace == NULL)
 495                 event->trace = trace_nop_print;
 496         if (event->raw == NULL)
 497                 event->raw = trace_nop_print;
 498         if (event->hex == NULL)
 499                 event->hex = trace_nop_print;
 500         if (event->binary == NULL)
 501                 event->binary = trace_nop_print;
 502
 503         key = event->type & (EVENT_HASHSIZE - 1);
 504
 505         hlist_add_head_rcu(&event->node, &event_hash[key]);
 506
 507         ret = event->type;
 508  out:
 509         mutex_unlock(&trace_event_mutex);
 510
 511         return ret;
 512 }
 513
 514 /**
 515  * unregister_ftrace_event - remove a no longer used event
 516  * @event: the event to remove
 517  */
 518 int unregister_ftrace_event(struct trace_event *event)
 519 {
 520         mutex_lock(&trace_event_mutex);
 521         hlist_del(&event->node);
 522         mutex_unlock(&trace_event_mutex);
 523
 524         return 0;
 525 }
 526
 527 /*
 528  * Standard events
 529  */
 530
 531 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 532 {
 533         return TRACE_TYPE_HANDLED;
 534 }
 535
 536 /* TRACE_FN */
 537 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 538 {
 539         struct ftrace_entry *field;
 540         struct trace_seq *s = &iter->seq;
 541
 542         trace_assign_type(field, iter->ent);
 543
 544         if (!seq_print_ip_sym(s, field->ip, flags))
 545                 goto partial;
 546
 547         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 548                 if (!trace_seq_printf(s, " <-"))
 549                         goto partial;
 550                 if (!seq_print_ip_sym(s,
 551                                       field->parent_ip,
 552                                       flags))
 553                         goto partial;
 554         }
 555         if (!trace_seq_printf(s, "\n"))
 556                 goto partial;
 557
 558         return TRACE_TYPE_HANDLED;
 559
 560  partial:
 561         return TRACE_TYPE_PARTIAL_LINE;
 562 }
 563
 564 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 565 {
 566         struct ftrace_entry *field;
 567
 568         trace_assign_type(field, iter->ent);
 569
 570         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 571                               field->ip,
 572                               field->parent_ip))
 573                 return TRACE_TYPE_PARTIAL_LINE;
 574
 575         return TRACE_TYPE_HANDLED;
 576 }
 577
 578 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 579 {
 580         struct ftrace_entry *field;
 581         struct trace_seq *s = &iter->seq;
 582
 583         trace_assign_type(field, iter->ent);
 584
 585         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 586         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 587
 588         return TRACE_TYPE_HANDLED;
 589 }
 590
 591 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 592 {
 593         struct ftrace_entry *field;
 594         struct trace_seq *s = &iter->seq;
 595
 596         trace_assign_type(field, iter->ent);
 597
 598         SEQ_PUT_FIELD_RET(s, field->ip);
 599         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 600
 601         return TRACE_TYPE_HANDLED;
 602 }
 603
 604 static struct trace_event trace_fn_event = {
 605         .type           = TRACE_FN,
 606         .trace          = trace_fn_trace,
 607         .raw            = trace_fn_raw,
 608         .hex            = trace_fn_hex,
 609         .binary         = trace_fn_bin,
 610 };
 611
 612 /* TRACE_CTX an TRACE_WAKE */
 613 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 614                                              char *delim)
 615 {
 616         struct ctx_switch_entry *field;
 617         char comm[TASK_COMM_LEN];
 618         int S, T;
 619
 620
 621         trace_assign_type(field, iter->ent);
 622
 623         T = task_state_char(field->next_state);
 624         S = task_state_char(field->prev_state);
 625         trace_find_cmdline(field->next_pid, comm);
 626         if (!trace_seq_printf(&iter->seq,
 627                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 628                               field->prev_pid,
 629                               field->prev_prio,
 630                               S, delim,
 631                               field->next_cpu,
 632                               field->next_pid,
 633                               field->next_prio,
 634                               T, comm))
 635                 return TRACE_TYPE_PARTIAL_LINE;
 636
 637         return TRACE_TYPE_HANDLED;
 638 }
 639
 640 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 641 {
 642         return trace_ctxwake_print(iter, "==>");
 643 }
 644
 645 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 646                                           int flags)
 647 {
 648         return trace_ctxwake_print(iter, "  +");
 649 }
 650
 651 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 652 {
 653         struct ctx_switch_entry *field;
 654         int T;
 655
 656         trace_assign_type(field, iter->ent);
 657
 658         if (!S)
 659                 task_state_char(field->prev_state);
 660         T = task_state_char(field->next_state);
 661         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 662                               field->prev_pid,
 663                               field->prev_prio,
 664                               S,
 665                               field->next_cpu,
 666                               field->next_pid,
 667                               field->next_prio,
 668                               T))
 669                 return TRACE_TYPE_PARTIAL_LINE;
 670
 671         return TRACE_TYPE_HANDLED;
 672 }
 673
 674 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 675 {
 676         return trace_ctxwake_raw(iter, 0);
 677 }
 678
 679 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 680 {
 681         return trace_ctxwake_raw(iter, '+');
 682 }
 683
 684
 685 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 686 {
 687         struct ctx_switch_entry *field;
 688         struct trace_seq *s = &iter->seq;
 689         int T;
 690
 691         trace_assign_type(field, iter->ent);
 692
 693         if (!S)
 694                 task_state_char(field->prev_state);
 695         T = task_state_char(field->next_state);
 696
 697         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 698         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 699         SEQ_PUT_HEX_FIELD_RET(s, S);
 700         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 701         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 702         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 703         SEQ_PUT_HEX_FIELD_RET(s, T);
 704
 705         return TRACE_TYPE_HANDLED;
 706 }
 707
 708 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 709 {
 710         return trace_ctxwake_hex(iter, 0);
 711 }
 712
 713 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 714 {
 715         return trace_ctxwake_hex(iter, '+');
 716 }
 717
 718 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 719                                            int flags)
 720 {
 721         struct ctx_switch_entry *field;
 722         struct trace_seq *s = &iter->seq;
 723
 724         trace_assign_type(field, iter->ent);
 725
 726         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 727         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 728         SEQ_PUT_FIELD_RET(s, field->prev_state);
 729         SEQ_PUT_FIELD_RET(s, field->next_pid);
 730         SEQ_PUT_FIELD_RET(s, field->next_prio);
 731         SEQ_PUT_FIELD_RET(s, field->next_state);
 732
 733         return TRACE_TYPE_HANDLED;
 734 }
 735
 736 static struct trace_event trace_ctx_event = {
 737         .type           = TRACE_CTX,
 738         .trace          = trace_ctx_print,
 739         .raw            = trace_ctx_raw,
 740         .hex            = trace_ctx_hex,
 741         .binary         = trace_ctxwake_bin,
 742 };
 743
 744 static struct trace_event trace_wake_event = {
 745         .type           = TRACE_WAKE,
 746         .trace          = trace_wake_print,
 747         .raw            = trace_wake_raw,
 748         .hex            = trace_wake_hex,
 749         .binary         = trace_ctxwake_bin,
 750 };
 751
 752 /* TRACE_SPECIAL */
 753 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 754                                              int flags)
 755 {
 756         struct special_entry *field;
 757
 758         trace_assign_type(field, iter->ent);
 759
 760         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 761                               field->arg1,
 762                               field->arg2,
 763                               field->arg3))
 764                 return TRACE_TYPE_PARTIAL_LINE;
 765
 766         return TRACE_TYPE_HANDLED;
 767 }
 768
 769 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 770                                            int flags)
 771 {
 772         struct special_entry *field;
 773         struct trace_seq *s = &iter->seq;
 774
 775         trace_assign_type(field, iter->ent);
 776
 777         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 778         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 779         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 780
 781         return TRACE_TYPE_HANDLED;
 782 }
 783
 784 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 785                                            int flags)
 786 {
 787         struct special_entry *field;
 788         struct trace_seq *s = &iter->seq;
 789
 790         trace_assign_type(field, iter->ent);
 791
 792         SEQ_PUT_FIELD_RET(s, field->arg1);
 793         SEQ_PUT_FIELD_RET(s, field->arg2);
 794         SEQ_PUT_FIELD_RET(s, field->arg3);
 795
 796         return TRACE_TYPE_HANDLED;
 797 }
 798
 799 static struct trace_event trace_special_event = {
 800         .type           = TRACE_SPECIAL,
 801         .trace          = trace_special_print,
 802         .raw            = trace_special_print,
 803         .hex            = trace_special_hex,
 804         .binary         = trace_special_bin,
 805 };
 806
 807 /* TRACE_STACK */
 808
 809 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 810                                            int flags)
 811 {
 812         struct stack_entry *field;
 813         struct trace_seq *s = &iter->seq;
 814         int i;
 815
 816         trace_assign_type(field, iter->ent);
 817
 818         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 819                 if (i) {
 820                         if (!trace_seq_puts(s, " <= "))
 821                                 goto partial;
 822
 823                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 824                                 goto partial;
 825                 }
 826                 if (!trace_seq_puts(s, "\n"))
 827                         goto partial;
 828         }
 829
 830         return TRACE_TYPE_HANDLED;
 831
 832  partial:
 833         return TRACE_TYPE_PARTIAL_LINE;
 834 }
 835
 836 static struct trace_event trace_stack_event = {
 837         .type           = TRACE_STACK,
 838         .trace          = trace_stack_print,
 839         .raw            = trace_special_print,
 840         .hex            = trace_special_hex,
 841         .binary         = trace_special_bin,
 842 };
 843
 844 /* TRACE_USER_STACK */
 845 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 846                                                 int flags)
 847 {
 848         struct userstack_entry *field;
 849         struct trace_seq *s = &iter->seq;
 850
 851         trace_assign_type(field, iter->ent);
 852
 853         if (!seq_print_userip_objs(field, s, flags))
 854                 goto partial;
 855
 856         if (!trace_seq_putc(s, '\n'))
 857                 goto partial;
 858
 859         return TRACE_TYPE_HANDLED;
 860
 861  partial:
 862         return TRACE_TYPE_PARTIAL_LINE;
 863 }
 864
 865 static struct trace_event trace_user_stack_event = {
 866         .type           = TRACE_USER_STACK,
 867         .trace          = trace_user_stack_print,
 868         .raw            = trace_special_print,
 869         .hex            = trace_special_hex,
 870         .binary         = trace_special_bin,
 871 };
 872
 873 /* TRACE_BPRINT */
 874 static enum print_line_t
 875 trace_bprint_print(struct trace_iterator *iter, int flags)
 876 {
 877         struct trace_entry *entry = iter->ent;
 878         struct trace_seq *s = &iter->seq;
 879         struct bprint_entry *field;
 880
 881         trace_assign_type(field, entry);
 882
 883         if (!seq_print_ip_sym(s, field->ip, flags))
 884                 goto partial;
 885
 886         if (!trace_seq_puts(s, ": "))
 887                 goto partial;
 888
 889         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 890                 goto partial;
 891
 892         return TRACE_TYPE_HANDLED;
 893
 894  partial:
 895         return TRACE_TYPE_PARTIAL_LINE;
 896 }
 897
 898
 899 static enum print_line_t
 900 trace_bprint_raw(struct trace_iterator *iter, int flags)
 901 {
 902         struct bprint_entry *field;
 903         struct trace_seq *s = &iter->seq;
 904
 905         trace_assign_type(field, iter->ent);
 906
 907         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 908                 goto partial;
 909
 910         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 911                 goto partial;
 912
 913         return TRACE_TYPE_HANDLED;
 914
 915  partial:
 916         return TRACE_TYPE_PARTIAL_LINE;
 917 }
 918
 919
 920 static struct trace_event trace_bprint_event = {
 921         .type           = TRACE_BPRINT,
 922         .trace          = trace_bprint_print,
 923         .raw            = trace_bprint_raw,
 924 };
 925
 926 /* TRACE_PRINT */
 927 static enum print_line_t trace_print_print(struct trace_iterator *iter,
 928                                            int flags)
 929 {
 930         struct print_entry *field;
 931         struct trace_seq *s = &iter->seq;
 932
 933         trace_assign_type(field, iter->ent);
 934
 935         if (!seq_print_ip_sym(s, field->ip, flags))
 936                 goto partial;
 937
 938         if (!trace_seq_printf(s, ": %s", field->buf))
 939                 goto partial;
 940
 941         return TRACE_TYPE_HANDLED;
 942
 943  partial:
 944         return TRACE_TYPE_PARTIAL_LINE;
 945 }
 946
 947 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 948 {
 949         struct print_entry *field;
 950
 951         trace_assign_type(field, iter->ent);
 952
 953         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 954                 goto partial;
 955
 956         return TRACE_TYPE_HANDLED;
 957
 958  partial:
 959         return TRACE_TYPE_PARTIAL_LINE;
 960 }
 961
 962 static struct trace_event trace_print_event = {
 963         .type           = TRACE_PRINT,
 964         .trace          = trace_print_print,
 965         .raw            = trace_print_raw,
 966 };
 967
 968
 969 static struct trace_event *events[] __initdata = {
 970         &trace_fn_event,
 971         &trace_ctx_event,
 972         &trace_wake_event,
 973         &trace_special_event,
 974         &trace_stack_event,
 975         &trace_user_stack_event,
 976         &trace_bprint_event,
 977         &trace_print_event,
 978         NULL
 979 };
 980
 981 __init static int init_events(void)
 982 {
 983         struct trace_event *event;
 984         int i, ret;
 985
 986         for (i = 0; events[i]; i++) {
 987                 event = events[i];
 988
 989                 ret = register_ftrace_event(event);
 990                 if (!ret) {
 991                         printk(KERN_WARNING "event %d failed to register\n",
 992                                event->type);
 993                         WARN_ON_ONCE(1);
 994                 }
 995         }
 996
 997         return 0;
 998 }
 999 device_initcall(init_events);