SAFE public projects git trees. - safe/jmp/linux-2.6/blob - kernel/trace/trace_output.c

   1 /*
   2  * trace_output.c
   3  *
   4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11
  12 #include "trace_output.h"
  13
  14 /* must be a power of 2 */
  15 #define EVENT_HASHSIZE  128
  16
  17 static DEFINE_MUTEX(trace_event_mutex);
  18 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  19
  20 static int next_event_type = __TRACE_LAST_TYPE + 1;
  21
  22 /**
  23  * trace_seq_printf - sequence printing of trace information
  24  * @s: trace sequence descriptor
  25  * @fmt: printf format string
  26  *
  27  * The tracer may use either sequence operations or its own
  28  * copy to user routines. To simplify formating of a trace
  29  * trace_seq_printf is used to store strings into a special
  30  * buffer (@s). Then the output may be either used by
  31  * the sequencer or pulled into another buffer.
  32  */
  33 int
  34 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  35 {
  36         int len = (PAGE_SIZE - 1) - s->len;
  37         va_list ap;
  38         int ret;
  39
  40         if (!len)
  41                 return 0;
  42
  43         va_start(ap, fmt);
  44         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  45         va_end(ap);
  46
  47         /* If we can't write it all, don't bother writing anything */
  48         if (ret >= len)
  49                 return 0;
  50
  51         s->len += ret;
  52
  53         return len;
  54 }
  55
  56 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  57 {
  58         int len = (PAGE_SIZE - 1) - s->len;
  59         int ret;
  60
  61         if (!len)
  62                 return 0;
  63
  64         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
  65
  66         /* If we can't write it all, don't bother writing anything */
  67         if (ret >= len)
  68                 return 0;
  69
  70         s->len += ret;
  71
  72         return len;
  73 }
  74
  75 /**
  76  * trace_seq_puts - trace sequence printing of simple string
  77  * @s: trace sequence descriptor
  78  * @str: simple string to record
  79  *
  80  * The tracer may use either the sequence operations or its own
  81  * copy to user routines. This function records a simple string
  82  * into a special buffer (@s) for later retrieval by a sequencer
  83  * or other mechanism.
  84  */
  85 int trace_seq_puts(struct trace_seq *s, const char *str)
  86 {
  87         int len = strlen(str);
  88
  89         if (len > ((PAGE_SIZE - 1) - s->len))
  90                 return 0;
  91
  92         memcpy(s->buffer + s->len, str, len);
  93         s->len += len;
  94
  95         return len;
  96 }
  97
  98 int trace_seq_putc(struct trace_seq *s, unsigned char c)
  99 {
 100         if (s->len >= (PAGE_SIZE - 1))
 101                 return 0;
 102
 103         s->buffer[s->len++] = c;
 104
 105         return 1;
 106 }
 107
 108 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 109 {
 110         if (len > ((PAGE_SIZE - 1) - s->len))
 111                 return 0;
 112
 113         memcpy(s->buffer + s->len, mem, len);
 114         s->len += len;
 115
 116         return len;
 117 }
 118
 119 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 120 {
 121         unsigned char hex[HEX_CHARS];
 122         unsigned char *data = mem;
 123         int i, j;
 124
 125 #ifdef __BIG_ENDIAN
 126         for (i = 0, j = 0; i < len; i++) {
 127 #else
 128         for (i = len-1, j = 0; i >= 0; i--) {
 129 #endif
 130                 hex[j++] = hex_asc_hi(data[i]);
 131                 hex[j++] = hex_asc_lo(data[i]);
 132         }
 133         hex[j++] = ' ';
 134
 135         return trace_seq_putmem(s, hex, j);
 136 }
 137
 138 int trace_seq_path(struct trace_seq *s, struct path *path)
 139 {
 140         unsigned char *p;
 141
 142         if (s->len >= (PAGE_SIZE - 1))
 143                 return 0;
 144         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 145         if (!IS_ERR(p)) {
 146                 p = mangle_path(s->buffer + s->len, p, "\n");
 147                 if (p) {
 148                         s->len = p - s->buffer;
 149                         return 1;
 150                 }
 151         } else {
 152                 s->buffer[s->len++] = '?';
 153                 return 1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 #ifdef CONFIG_KRETPROBES
 160 static inline const char *kretprobed(const char *name)
 161 {
 162         static const char tramp_name[] = "kretprobe_trampoline";
 163         int size = sizeof(tramp_name);
 164
 165         if (strncmp(tramp_name, name, size) == 0)
 166                 return "[unknown/kretprobe'd]";
 167         return name;
 168 }
 169 #else
 170 static inline const char *kretprobed(const char *name)
 171 {
 172         return name;
 173 }
 174 #endif /* CONFIG_KRETPROBES */
 175
 176 static int
 177 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 178 {
 179 #ifdef CONFIG_KALLSYMS
 180         char str[KSYM_SYMBOL_LEN];
 181         const char *name;
 182
 183         kallsyms_lookup(address, NULL, NULL, NULL, str);
 184
 185         name = kretprobed(str);
 186
 187         return trace_seq_printf(s, fmt, name);
 188 #endif
 189         return 1;
 190 }
 191
 192 static int
 193 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 194                      unsigned long address)
 195 {
 196 #ifdef CONFIG_KALLSYMS
 197         char str[KSYM_SYMBOL_LEN];
 198         const char *name;
 199
 200         sprint_symbol(str, address);
 201         name = kretprobed(str);
 202
 203         return trace_seq_printf(s, fmt, name);
 204 #endif
 205         return 1;
 206 }
 207
 208 #ifndef CONFIG_64BIT
 209 # define IP_FMT "%08lx"
 210 #else
 211 # define IP_FMT "%016lx"
 212 #endif
 213
 214 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 215                       unsigned long ip, unsigned long sym_flags)
 216 {
 217         struct file *file = NULL;
 218         unsigned long vmstart = 0;
 219         int ret = 1;
 220
 221         if (mm) {
 222                 const struct vm_area_struct *vma;
 223
 224                 down_read(&mm->mmap_sem);
 225                 vma = find_vma(mm, ip);
 226                 if (vma) {
 227                         file = vma->vm_file;
 228                         vmstart = vma->vm_start;
 229                 }
 230                 if (file) {
 231                         ret = trace_seq_path(s, &file->f_path);
 232                         if (ret)
 233                                 ret = trace_seq_printf(s, "[+0x%lx]",
 234                                                        ip - vmstart);
 235                 }
 236                 up_read(&mm->mmap_sem);
 237         }
 238         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 239                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 240         return ret;
 241 }
 242
 243 int
 244 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 245                       unsigned long sym_flags)
 246 {
 247         struct mm_struct *mm = NULL;
 248         int ret = 1;
 249         unsigned int i;
 250
 251         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 252                 struct task_struct *task;
 253                 /*
 254                  * we do the lookup on the thread group leader,
 255                  * since individual threads might have already quit!
 256                  */
 257                 rcu_read_lock();
 258                 task = find_task_by_vpid(entry->ent.tgid);
 259                 if (task)
 260                         mm = get_task_mm(task);
 261                 rcu_read_unlock();
 262         }
 263
 264         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 265                 unsigned long ip = entry->caller[i];
 266
 267                 if (ip == ULONG_MAX || !ret)
 268                         break;
 269                 if (i && ret)
 270                         ret = trace_seq_puts(s, " <- ");
 271                 if (!ip) {
 272                         if (ret)
 273                                 ret = trace_seq_puts(s, "??");
 274                         continue;
 275                 }
 276                 if (!ret)
 277                         break;
 278                 if (ret)
 279                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 280         }
 281
 282         if (mm)
 283                 mmput(mm);
 284         return ret;
 285 }
 286
 287 int
 288 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 289 {
 290         int ret;
 291
 292         if (!ip)
 293                 return trace_seq_printf(s, "0");
 294
 295         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 296                 ret = seq_print_sym_offset(s, "%s", ip);
 297         else
 298                 ret = seq_print_sym_short(s, "%s", ip);
 299
 300         if (!ret)
 301                 return 0;
 302
 303         if (sym_flags & TRACE_ITER_SYM_ADDR)
 304                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 305         return ret;
 306 }
 307
 308 static int
 309 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 310 {
 311         int hardirq, softirq;
 312         char *comm;
 313
 314         comm = trace_find_cmdline(entry->pid);
 315         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 316         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 317
 318         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 319                               comm, entry->pid, cpu,
 320                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 321                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 322                                   'X' : '.',
 323                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 324                                 'N' : '.',
 325                               (hardirq && softirq) ? 'H' :
 326                                 hardirq ? 'h' : softirq ? 's' : '.'))
 327                 return 0;
 328
 329         if (entry->preempt_count)
 330                 return trace_seq_printf(s, "%x", entry->preempt_count);
 331         return trace_seq_puts(s, ".");
 332 }
 333
 334 static unsigned long preempt_mark_thresh = 100;
 335
 336 static int
 337 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 338                     unsigned long rel_usecs)
 339 {
 340         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 341                                 rel_usecs > preempt_mark_thresh ? '!' :
 342                                   rel_usecs > 1 ? '+' : ' ');
 343 }
 344
 345 int trace_print_context(struct trace_iterator *iter)
 346 {
 347         struct trace_seq *s = &iter->seq;
 348         struct trace_entry *entry = iter->ent;
 349         char *comm = trace_find_cmdline(entry->pid);
 350         unsigned long long t = ns2usecs(iter->ts);
 351         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 352         unsigned long secs = (unsigned long)t;
 353
 354         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 355                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 356 }
 357
 358 int trace_print_lat_context(struct trace_iterator *iter)
 359 {
 360         u64 next_ts;
 361         int ret;
 362         struct trace_seq *s = &iter->seq;
 363         struct trace_entry *entry = iter->ent,
 364                            *next_entry = trace_find_next_entry(iter, NULL,
 365                                                                &next_ts);
 366         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 367         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 368         unsigned long rel_usecs;
 369
 370         if (!next_entry)
 371                 next_ts = iter->ts;
 372         rel_usecs = ns2usecs(next_ts - iter->ts);
 373
 374         if (verbose) {
 375                 char *comm = trace_find_cmdline(entry->pid);
 376                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 377                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 378                                        entry->pid, iter->cpu, entry->flags,
 379                                        entry->preempt_count, iter->idx,
 380                                        ns2usecs(iter->ts),
 381                                        abs_usecs / USEC_PER_MSEC,
 382                                        abs_usecs % USEC_PER_MSEC,
 383                                        rel_usecs / USEC_PER_MSEC,
 384                                        rel_usecs % USEC_PER_MSEC);
 385         } else {
 386                 ret = lat_print_generic(s, entry, iter->cpu);
 387                 if (ret)
 388                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 389         }
 390
 391         return ret;
 392 }
 393
 394 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 395
 396 static int task_state_char(unsigned long state)
 397 {
 398         int bit = state ? __ffs(state) + 1 : 0;
 399
 400         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 401 }
 402
 403 /**
 404  * ftrace_find_event - find a registered event
 405  * @type: the type of event to look for
 406  *
 407  * Returns an event of type @type otherwise NULL
 408  */
 409 struct trace_event *ftrace_find_event(int type)
 410 {
 411         struct trace_event *event;
 412         struct hlist_node *n;
 413         unsigned key;
 414
 415         key = type & (EVENT_HASHSIZE - 1);
 416
 417         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 418                 if (event->type == type)
 419                         return event;
 420         }
 421
 422         return NULL;
 423 }
 424
 425 /**
 426  * register_ftrace_event - register output for an event type
 427  * @event: the event type to register
 428  *
 429  * Event types are stored in a hash and this hash is used to
 430  * find a way to print an event. If the @event->type is set
 431  * then it will use that type, otherwise it will assign a
 432  * type to use.
 433  *
 434  * If you assign your own type, please make sure it is added
 435  * to the trace_type enum in trace.h, to avoid collisions
 436  * with the dynamic types.
 437  *
 438  * Returns the event type number or zero on error.
 439  */
 440 int register_ftrace_event(struct trace_event *event)
 441 {
 442         unsigned key;
 443         int ret = 0;
 444
 445         mutex_lock(&trace_event_mutex);
 446
 447         if (!event->type)
 448                 event->type = next_event_type++;
 449         else if (event->type > __TRACE_LAST_TYPE) {
 450                 printk(KERN_WARNING "Need to add type to trace.h\n");
 451                 WARN_ON(1);
 452         }
 453
 454         if (ftrace_find_event(event->type))
 455                 goto out;
 456
 457         if (event->trace == NULL)
 458                 event->trace = trace_nop_print;
 459         if (event->raw == NULL)
 460                 event->raw = trace_nop_print;
 461         if (event->hex == NULL)
 462                 event->hex = trace_nop_print;
 463         if (event->binary == NULL)
 464                 event->binary = trace_nop_print;
 465
 466         key = event->type & (EVENT_HASHSIZE - 1);
 467
 468         hlist_add_head_rcu(&event->node, &event_hash[key]);
 469
 470         ret = event->type;
 471  out:
 472         mutex_unlock(&trace_event_mutex);
 473
 474         return ret;
 475 }
 476
 477 /**
 478  * unregister_ftrace_event - remove a no longer used event
 479  * @event: the event to remove
 480  */
 481 int unregister_ftrace_event(struct trace_event *event)
 482 {
 483         mutex_lock(&trace_event_mutex);
 484         hlist_del(&event->node);
 485         mutex_unlock(&trace_event_mutex);
 486
 487         return 0;
 488 }
 489
 490 /*
 491  * Standard events
 492  */
 493
 494 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 495 {
 496         return TRACE_TYPE_HANDLED;
 497 }
 498
 499 /* TRACE_FN */
 500 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 501 {
 502         struct ftrace_entry *field;
 503         struct trace_seq *s = &iter->seq;
 504
 505         trace_assign_type(field, iter->ent);
 506
 507         if (!seq_print_ip_sym(s, field->ip, flags))
 508                 goto partial;
 509
 510         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 511                 if (!trace_seq_printf(s, " <-"))
 512                         goto partial;
 513                 if (!seq_print_ip_sym(s,
 514                                       field->parent_ip,
 515                                       flags))
 516                         goto partial;
 517         }
 518         if (!trace_seq_printf(s, "\n"))
 519                 goto partial;
 520
 521         return TRACE_TYPE_HANDLED;
 522
 523  partial:
 524         return TRACE_TYPE_PARTIAL_LINE;
 525 }
 526
 527 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 528 {
 529         struct ftrace_entry *field;
 530
 531         trace_assign_type(field, iter->ent);
 532
 533         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 534                               field->ip,
 535                               field->parent_ip))
 536                 return TRACE_TYPE_PARTIAL_LINE;
 537
 538         return TRACE_TYPE_HANDLED;
 539 }
 540
 541 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 542 {
 543         struct ftrace_entry *field;
 544         struct trace_seq *s = &iter->seq;
 545
 546         trace_assign_type(field, iter->ent);
 547
 548         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 549         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 550
 551         return TRACE_TYPE_HANDLED;
 552 }
 553
 554 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 555 {
 556         struct ftrace_entry *field;
 557         struct trace_seq *s = &iter->seq;
 558
 559         trace_assign_type(field, iter->ent);
 560
 561         SEQ_PUT_FIELD_RET(s, field->ip);
 562         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 563
 564         return TRACE_TYPE_HANDLED;
 565 }
 566
 567 static struct trace_event trace_fn_event = {
 568         .type           = TRACE_FN,
 569         .trace          = trace_fn_trace,
 570         .raw            = trace_fn_raw,
 571         .hex            = trace_fn_hex,
 572         .binary         = trace_fn_bin,
 573 };
 574
 575 /* TRACE_CTX an TRACE_WAKE */
 576 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 577                                              char *delim)
 578 {
 579         struct ctx_switch_entry *field;
 580         char *comm;
 581         int S, T;
 582
 583         trace_assign_type(field, iter->ent);
 584
 585         T = task_state_char(field->next_state);
 586         S = task_state_char(field->prev_state);
 587         comm = trace_find_cmdline(field->next_pid);
 588         if (!trace_seq_printf(&iter->seq,
 589                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 590                               field->prev_pid,
 591                               field->prev_prio,
 592                               S, delim,
 593                               field->next_cpu,
 594                               field->next_pid,
 595                               field->next_prio,
 596                               T, comm))
 597                 return TRACE_TYPE_PARTIAL_LINE;
 598
 599         return TRACE_TYPE_HANDLED;
 600 }
 601
 602 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 603 {
 604         return trace_ctxwake_print(iter, "==>");
 605 }
 606
 607 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 608                                           int flags)
 609 {
 610         return trace_ctxwake_print(iter, "  +");
 611 }
 612
 613 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 614 {
 615         struct ctx_switch_entry *field;
 616         int T;
 617
 618         trace_assign_type(field, iter->ent);
 619
 620         if (!S)
 621                 task_state_char(field->prev_state);
 622         T = task_state_char(field->next_state);
 623         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 624                               field->prev_pid,
 625                               field->prev_prio,
 626                               S,
 627                               field->next_cpu,
 628                               field->next_pid,
 629                               field->next_prio,
 630                               T))
 631                 return TRACE_TYPE_PARTIAL_LINE;
 632
 633         return TRACE_TYPE_HANDLED;
 634 }
 635
 636 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 637 {
 638         return trace_ctxwake_raw(iter, 0);
 639 }
 640
 641 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 642 {
 643         return trace_ctxwake_raw(iter, '+');
 644 }
 645
 646
 647 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 648 {
 649         struct ctx_switch_entry *field;
 650         struct trace_seq *s = &iter->seq;
 651         int T;
 652
 653         trace_assign_type(field, iter->ent);
 654
 655         if (!S)
 656                 task_state_char(field->prev_state);
 657         T = task_state_char(field->next_state);
 658
 659         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 660         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 661         SEQ_PUT_HEX_FIELD_RET(s, S);
 662         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 663         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 664         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 665         SEQ_PUT_HEX_FIELD_RET(s, T);
 666
 667         return TRACE_TYPE_HANDLED;
 668 }
 669
 670 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 671 {
 672         return trace_ctxwake_hex(iter, 0);
 673 }
 674
 675 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 676 {
 677         return trace_ctxwake_hex(iter, '+');
 678 }
 679
 680 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 681                                            int flags)
 682 {
 683         struct ctx_switch_entry *field;
 684         struct trace_seq *s = &iter->seq;
 685
 686         trace_assign_type(field, iter->ent);
 687
 688         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 689         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 690         SEQ_PUT_FIELD_RET(s, field->prev_state);
 691         SEQ_PUT_FIELD_RET(s, field->next_pid);
 692         SEQ_PUT_FIELD_RET(s, field->next_prio);
 693         SEQ_PUT_FIELD_RET(s, field->next_state);
 694
 695         return TRACE_TYPE_HANDLED;
 696 }
 697
 698 static struct trace_event trace_ctx_event = {
 699         .type           = TRACE_CTX,
 700         .trace          = trace_ctx_print,
 701         .raw            = trace_ctx_raw,
 702         .hex            = trace_ctx_hex,
 703         .binary         = trace_ctxwake_bin,
 704 };
 705
 706 static struct trace_event trace_wake_event = {
 707         .type           = TRACE_WAKE,
 708         .trace          = trace_wake_print,
 709         .raw            = trace_wake_raw,
 710         .hex            = trace_wake_hex,
 711         .binary         = trace_ctxwake_bin,
 712 };
 713
 714 /* TRACE_SPECIAL */
 715 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 716                                              int flags)
 717 {
 718         struct special_entry *field;
 719
 720         trace_assign_type(field, iter->ent);
 721
 722         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 723                               field->arg1,
 724                               field->arg2,
 725                               field->arg3))
 726                 return TRACE_TYPE_PARTIAL_LINE;
 727
 728         return TRACE_TYPE_HANDLED;
 729 }
 730
 731 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 732                                            int flags)
 733 {
 734         struct special_entry *field;
 735         struct trace_seq *s = &iter->seq;
 736
 737         trace_assign_type(field, iter->ent);
 738
 739         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 740         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 741         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 742
 743         return TRACE_TYPE_HANDLED;
 744 }
 745
 746 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 747                                            int flags)
 748 {
 749         struct special_entry *field;
 750         struct trace_seq *s = &iter->seq;
 751
 752         trace_assign_type(field, iter->ent);
 753
 754         SEQ_PUT_FIELD_RET(s, field->arg1);
 755         SEQ_PUT_FIELD_RET(s, field->arg2);
 756         SEQ_PUT_FIELD_RET(s, field->arg3);
 757
 758         return TRACE_TYPE_HANDLED;
 759 }
 760
 761 static struct trace_event trace_special_event = {
 762         .type           = TRACE_SPECIAL,
 763         .trace          = trace_special_print,
 764         .raw            = trace_special_print,
 765         .hex            = trace_special_hex,
 766         .binary         = trace_special_bin,
 767 };
 768
 769 /* TRACE_STACK */
 770
 771 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 772                                            int flags)
 773 {
 774         struct stack_entry *field;
 775         struct trace_seq *s = &iter->seq;
 776         int i;
 777
 778         trace_assign_type(field, iter->ent);
 779
 780         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 781                 if (i) {
 782                         if (!trace_seq_puts(s, " <= "))
 783                                 goto partial;
 784
 785                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 786                                 goto partial;
 787                 }
 788                 if (!trace_seq_puts(s, "\n"))
 789                         goto partial;
 790         }
 791
 792         return TRACE_TYPE_HANDLED;
 793
 794  partial:
 795         return TRACE_TYPE_PARTIAL_LINE;
 796 }
 797
 798 static struct trace_event trace_stack_event = {
 799         .type           = TRACE_STACK,
 800         .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         .raw            = trace_special_print,
 831         .hex            = trace_special_hex,
 832         .binary         = trace_special_bin,
 833 };
 834
 835 /* TRACE_PRINT */
 836 static enum print_line_t
 837 trace_print_print(struct trace_iterator *iter, int flags)
 838 {
 839         struct trace_entry *entry = iter->ent;
 840         struct trace_seq *s = &iter->seq;
 841         struct print_entry *field;
 842
 843         trace_assign_type(field, entry);
 844
 845         if (!seq_print_ip_sym(s, field->ip, flags))
 846                 goto partial;
 847
 848         if (!trace_seq_puts(s, ": "))
 849                 goto partial;
 850
 851         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 852                 goto partial;
 853
 854         return TRACE_TYPE_HANDLED;
 855
 856  partial:
 857         return TRACE_TYPE_PARTIAL_LINE;
 858 }
 859
 860
 861 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 862 {
 863         struct print_entry *field;
 864         struct trace_seq *s = &iter->seq;
 865
 866         trace_assign_type(field, iter->ent);
 867
 868         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 869                 goto partial;
 870
 871         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 872                 goto partial;
 873
 874         return TRACE_TYPE_HANDLED;
 875
 876  partial:
 877         return TRACE_TYPE_PARTIAL_LINE;
 878 }
 879
 880
 881 static struct trace_event trace_print_event = {
 882         .type           = TRACE_PRINT,
 883         .trace          = trace_print_print,
 884         .raw            = trace_print_raw,
 885 };
 886
 887 static struct trace_event *events[] __initdata = {
 888         &trace_fn_event,
 889         &trace_ctx_event,
 890         &trace_wake_event,
 891         &trace_special_event,
 892         &trace_stack_event,
 893         &trace_user_stack_event,
 894         &trace_print_event,
 895         NULL
 896 };
 897
 898 __init static int init_events(void)
 899 {
 900         struct trace_event *event;
 901         int i, ret;
 902
 903         for (i = 0; events[i]; i++) {
 904                 event = events[i];
 905
 906                 ret = register_ftrace_event(event);
 907                 if (!ret) {
 908                         printk(KERN_WARNING "event %d failed to register\n",
 909                                event->type);
 910                         WARN_ON_ONCE(1);
 911                 }
 912         }
 913
 914         return 0;
 915 }
 916 device_initcall(init_events);