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