git.oblomov.eu Git - linux-2.6/blob - kernel/trace/trace_output.c

   1 /*
   2  * trace_output.c
   3  *
   4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11
  12 #include "trace_output.h"
  13
  14 /* must be a power of 2 */
  15 #define EVENT_HASHSIZE  128
  16
  17 static DEFINE_MUTEX(trace_event_mutex);
  18 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  19
  20 static int next_event_type = __TRACE_LAST_TYPE + 1;
  21
  22 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  23 {
  24         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  25
  26         s->buffer[len] = 0;
  27         seq_puts(m, s->buffer);
  28
  29         trace_seq_init(s);
  30 }
  31
  32 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  33 {
  34         struct trace_seq *s = &iter->seq;
  35         struct trace_entry *entry = iter->ent;
  36         struct bprint_entry *field;
  37         int ret;
  38
  39         trace_assign_type(field, entry);
  40
  41         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  42         if (!ret)
  43                 return TRACE_TYPE_PARTIAL_LINE;
  44
  45         return TRACE_TYPE_HANDLED;
  46 }
  47
  48 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  49 {
  50         struct trace_seq *s = &iter->seq;
  51         struct trace_entry *entry = iter->ent;
  52         struct print_entry *field;
  53         int ret;
  54
  55         trace_assign_type(field, entry);
  56
  57         ret = trace_seq_printf(s, "%s", field->buf);
  58         if (!ret)
  59                 return TRACE_TYPE_PARTIAL_LINE;
  60
  61         return TRACE_TYPE_HANDLED;
  62 }
  63
  64 /**
  65  * trace_seq_printf - sequence printing of trace information
  66  * @s: trace sequence descriptor
  67  * @fmt: printf format string
  68  *
  69  * The tracer may use either sequence operations or its own
  70  * copy to user routines. To simplify formating of a trace
  71  * trace_seq_printf is used to store strings into a special
  72  * buffer (@s). Then the output may be either used by
  73  * the sequencer or pulled into another buffer.
  74  */
  75 int
  76 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  77 {
  78         int len = (PAGE_SIZE - 1) - s->len;
  79         va_list ap;
  80         int ret;
  81
  82         if (!len)
  83                 return 0;
  84
  85         va_start(ap, fmt);
  86         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  87         va_end(ap);
  88
  89         /* If we can't write it all, don't bother writing anything */
  90         if (ret >= len)
  91                 return 0;
  92
  93         s->len += ret;
  94
  95         return len;
  96 }
  97 EXPORT_SYMBOL_GPL(trace_seq_printf);
  98
  99 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 100 {
 101         int len = (PAGE_SIZE - 1) - s->len;
 102         int ret;
 103
 104         if (!len)
 105                 return 0;
 106
 107         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 108
 109         /* If we can't write it all, don't bother writing anything */
 110         if (ret >= len)
 111                 return 0;
 112
 113         s->len += ret;
 114
 115         return len;
 116 }
 117
 118 /**
 119  * trace_seq_puts - trace sequence printing of simple string
 120  * @s: trace sequence descriptor
 121  * @str: simple string to record
 122  *
 123  * The tracer may use either the sequence operations or its own
 124  * copy to user routines. This function records a simple string
 125  * into a special buffer (@s) for later retrieval by a sequencer
 126  * or other mechanism.
 127  */
 128 int trace_seq_puts(struct trace_seq *s, const char *str)
 129 {
 130         int len = strlen(str);
 131
 132         if (len > ((PAGE_SIZE - 1) - s->len))
 133                 return 0;
 134
 135         memcpy(s->buffer + s->len, str, len);
 136         s->len += len;
 137
 138         return len;
 139 }
 140
 141 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 142 {
 143         if (s->len >= (PAGE_SIZE - 1))
 144                 return 0;
 145
 146         s->buffer[s->len++] = c;
 147
 148         return 1;
 149 }
 150
 151 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 152 {
 153         if (len > ((PAGE_SIZE - 1) - s->len))
 154                 return 0;
 155
 156         memcpy(s->buffer + s->len, mem, len);
 157         s->len += len;
 158
 159         return len;
 160 }
 161
 162 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 163 {
 164         unsigned char hex[HEX_CHARS];
 165         const unsigned char *data = mem;
 166         int i, j;
 167
 168 #ifdef __BIG_ENDIAN
 169         for (i = 0, j = 0; i < len; i++) {
 170 #else
 171         for (i = len-1, j = 0; i >= 0; i--) {
 172 #endif
 173                 hex[j++] = hex_asc_hi(data[i]);
 174                 hex[j++] = hex_asc_lo(data[i]);
 175         }
 176         hex[j++] = ' ';
 177
 178         return trace_seq_putmem(s, hex, j);
 179 }
 180
 181 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 182 {
 183         void *ret;
 184
 185         if (len > ((PAGE_SIZE - 1) - s->len))
 186                 return NULL;
 187
 188         ret = s->buffer + s->len;
 189         s->len += len;
 190
 191         return ret;
 192 }
 193
 194 int trace_seq_path(struct trace_seq *s, struct path *path)
 195 {
 196         unsigned char *p;
 197
 198         if (s->len >= (PAGE_SIZE - 1))
 199                 return 0;
 200         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 201         if (!IS_ERR(p)) {
 202                 p = mangle_path(s->buffer + s->len, p, "\n");
 203                 if (p) {
 204                         s->len = p - s->buffer;
 205                         return 1;
 206                 }
 207         } else {
 208                 s->buffer[s->len++] = '?';
 209                 return 1;
 210         }
 211
 212         return 0;
 213 }
 214
 215 #ifdef CONFIG_KRETPROBES
 216 static inline const char *kretprobed(const char *name)
 217 {
 218         static const char tramp_name[] = "kretprobe_trampoline";
 219         int size = sizeof(tramp_name);
 220
 221         if (strncmp(tramp_name, name, size) == 0)
 222                 return "[unknown/kretprobe'd]";
 223         return name;
 224 }
 225 #else
 226 static inline const char *kretprobed(const char *name)
 227 {
 228         return name;
 229 }
 230 #endif /* CONFIG_KRETPROBES */
 231
 232 static int
 233 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 234 {
 235 #ifdef CONFIG_KALLSYMS
 236         char str[KSYM_SYMBOL_LEN];
 237         const char *name;
 238
 239         kallsyms_lookup(address, NULL, NULL, NULL, str);
 240
 241         name = kretprobed(str);
 242
 243         return trace_seq_printf(s, fmt, name);
 244 #endif
 245         return 1;
 246 }
 247
 248 static int
 249 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 250                      unsigned long address)
 251 {
 252 #ifdef CONFIG_KALLSYMS
 253         char str[KSYM_SYMBOL_LEN];
 254         const char *name;
 255
 256         sprint_symbol(str, address);
 257         name = kretprobed(str);
 258
 259         return trace_seq_printf(s, fmt, name);
 260 #endif
 261         return 1;
 262 }
 263
 264 #ifndef CONFIG_64BIT
 265 # define IP_FMT "%08lx"
 266 #else
 267 # define IP_FMT "%016lx"
 268 #endif
 269
 270 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 271                       unsigned long ip, unsigned long sym_flags)
 272 {
 273         struct file *file = NULL;
 274         unsigned long vmstart = 0;
 275         int ret = 1;
 276
 277         if (mm) {
 278                 const struct vm_area_struct *vma;
 279
 280                 down_read(&mm->mmap_sem);
 281                 vma = find_vma(mm, ip);
 282                 if (vma) {
 283                         file = vma->vm_file;
 284                         vmstart = vma->vm_start;
 285                 }
 286                 if (file) {
 287                         ret = trace_seq_path(s, &file->f_path);
 288                         if (ret)
 289                                 ret = trace_seq_printf(s, "[+0x%lx]",
 290                                                        ip - vmstart);
 291                 }
 292                 up_read(&mm->mmap_sem);
 293         }
 294         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 295                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 296         return ret;
 297 }
 298
 299 int
 300 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 301                       unsigned long sym_flags)
 302 {
 303         struct mm_struct *mm = NULL;
 304         int ret = 1;
 305         unsigned int i;
 306
 307         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 308                 struct task_struct *task;
 309                 /*
 310                  * we do the lookup on the thread group leader,
 311                  * since individual threads might have already quit!
 312                  */
 313                 rcu_read_lock();
 314                 task = find_task_by_vpid(entry->ent.tgid);
 315                 if (task)
 316                         mm = get_task_mm(task);
 317                 rcu_read_unlock();
 318         }
 319
 320         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 321                 unsigned long ip = entry->caller[i];
 322
 323                 if (ip == ULONG_MAX || !ret)
 324                         break;
 325                 if (i && ret)
 326                         ret = trace_seq_puts(s, " <- ");
 327                 if (!ip) {
 328                         if (ret)
 329                                 ret = trace_seq_puts(s, "??");
 330                         continue;
 331                 }
 332                 if (!ret)
 333                         break;
 334                 if (ret)
 335                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 336         }
 337
 338         if (mm)
 339                 mmput(mm);
 340         return ret;
 341 }
 342
 343 int
 344 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 345 {
 346         int ret;
 347
 348         if (!ip)
 349                 return trace_seq_printf(s, "0");
 350
 351         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 352                 ret = seq_print_sym_offset(s, "%s", ip);
 353         else
 354                 ret = seq_print_sym_short(s, "%s", ip);
 355
 356         if (!ret)
 357                 return 0;
 358
 359         if (sym_flags & TRACE_ITER_SYM_ADDR)
 360                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 361         return ret;
 362 }
 363
 364 static int
 365 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 366 {
 367         int hardirq, softirq;
 368         char comm[TASK_COMM_LEN];
 369
 370         trace_find_cmdline(entry->pid, comm);
 371         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 372         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 373
 374         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 375                               comm, entry->pid, cpu,
 376                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 377                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 378                                   'X' : '.',
 379                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 380                                 'N' : '.',
 381                               (hardirq && softirq) ? 'H' :
 382                                 hardirq ? 'h' : softirq ? 's' : '.'))
 383                 return 0;
 384
 385         if (entry->preempt_count)
 386                 return trace_seq_printf(s, "%x", entry->preempt_count);
 387         return trace_seq_puts(s, ".");
 388 }
 389
 390 static unsigned long preempt_mark_thresh = 100;
 391
 392 static int
 393 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 394                     unsigned long rel_usecs)
 395 {
 396         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 397                                 rel_usecs > preempt_mark_thresh ? '!' :
 398                                   rel_usecs > 1 ? '+' : ' ');
 399 }
 400
 401 int trace_print_context(struct trace_iterator *iter)
 402 {
 403         struct trace_seq *s = &iter->seq;
 404         struct trace_entry *entry = iter->ent;
 405         unsigned long long t = ns2usecs(iter->ts);
 406         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 407         unsigned long secs = (unsigned long)t;
 408         char comm[TASK_COMM_LEN];
 409
 410         trace_find_cmdline(entry->pid, comm);
 411
 412         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 413                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 414 }
 415
 416 int trace_print_lat_context(struct trace_iterator *iter)
 417 {
 418         u64 next_ts;
 419         int ret;
 420         struct trace_seq *s = &iter->seq;
 421         struct trace_entry *entry = iter->ent,
 422                            *next_entry = trace_find_next_entry(iter, NULL,
 423                                                                &next_ts);
 424         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 425         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 426         unsigned long rel_usecs;
 427
 428         if (!next_entry)
 429                 next_ts = iter->ts;
 430         rel_usecs = ns2usecs(next_ts - iter->ts);
 431
 432         if (verbose) {
 433                 char comm[TASK_COMM_LEN];
 434
 435                 trace_find_cmdline(entry->pid, comm);
 436
 437                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 438                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 439                                        entry->pid, iter->cpu, entry->flags,
 440                                        entry->preempt_count, iter->idx,
 441                                        ns2usecs(iter->ts),
 442                                        abs_usecs / USEC_PER_MSEC,
 443                                        abs_usecs % USEC_PER_MSEC,
 444                                        rel_usecs / USEC_PER_MSEC,
 445                                        rel_usecs % USEC_PER_MSEC);
 446         } else {
 447                 ret = lat_print_generic(s, entry, iter->cpu);
 448                 if (ret)
 449                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 450         }
 451
 452         return ret;
 453 }
 454
 455 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 456
 457 static int task_state_char(unsigned long state)
 458 {
 459         int bit = state ? __ffs(state) + 1 : 0;
 460
 461         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 462 }
 463
 464 /**
 465  * ftrace_find_event - find a registered event
 466  * @type: the type of event to look for
 467  *
 468  * Returns an event of type @type otherwise NULL
 469  */
 470 struct trace_event *ftrace_find_event(int type)
 471 {
 472         struct trace_event *event;
 473         struct hlist_node *n;
 474         unsigned key;
 475
 476         key = type & (EVENT_HASHSIZE - 1);
 477
 478         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 479                 if (event->type == type)
 480                         return event;
 481         }
 482
 483         return NULL;
 484 }
 485
 486 /**
 487  * register_ftrace_event - register output for an event type
 488  * @event: the event type to register
 489  *
 490  * Event types are stored in a hash and this hash is used to
 491  * find a way to print an event. If the @event->type is set
 492  * then it will use that type, otherwise it will assign a
 493  * type to use.
 494  *
 495  * If you assign your own type, please make sure it is added
 496  * to the trace_type enum in trace.h, to avoid collisions
 497  * with the dynamic types.
 498  *
 499  * Returns the event type number or zero on error.
 500  */
 501 int register_ftrace_event(struct trace_event *event)
 502 {
 503         unsigned key;
 504         int ret = 0;
 505
 506         mutex_lock(&trace_event_mutex);
 507
 508         if (!event) {
 509                 ret = next_event_type++;
 510                 goto out;
 511         }
 512
 513         if (!event->type)
 514                 event->type = next_event_type++;
 515         else if (event->type > __TRACE_LAST_TYPE) {
 516                 printk(KERN_WARNING "Need to add type to trace.h\n");
 517                 WARN_ON(1);
 518         }
 519
 520         if (ftrace_find_event(event->type))
 521                 goto out;
 522
 523         if (event->trace == NULL)
 524                 event->trace = trace_nop_print;
 525         if (event->raw == NULL)
 526                 event->raw = trace_nop_print;
 527         if (event->hex == NULL)
 528                 event->hex = trace_nop_print;
 529         if (event->binary == NULL)
 530                 event->binary = trace_nop_print;
 531
 532         key = event->type & (EVENT_HASHSIZE - 1);
 533
 534         hlist_add_head_rcu(&event->node, &event_hash[key]);
 535
 536         ret = event->type;
 537  out:
 538         mutex_unlock(&trace_event_mutex);
 539
 540         return ret;
 541 }
 542 EXPORT_SYMBOL_GPL(register_ftrace_event);
 543
 544 /**
 545  * unregister_ftrace_event - remove a no longer used event
 546  * @event: the event to remove
 547  */
 548 int unregister_ftrace_event(struct trace_event *event)
 549 {
 550         mutex_lock(&trace_event_mutex);
 551         hlist_del(&event->node);
 552         mutex_unlock(&trace_event_mutex);
 553
 554         return 0;
 555 }
 556 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 557
 558 /*
 559  * Standard events
 560  */
 561
 562 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 563 {
 564         return TRACE_TYPE_HANDLED;
 565 }
 566
 567 /* TRACE_FN */
 568 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 569 {
 570         struct ftrace_entry *field;
 571         struct trace_seq *s = &iter->seq;
 572
 573         trace_assign_type(field, iter->ent);
 574
 575         if (!seq_print_ip_sym(s, field->ip, flags))
 576                 goto partial;
 577
 578         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 579                 if (!trace_seq_printf(s, " <-"))
 580                         goto partial;
 581                 if (!seq_print_ip_sym(s,
 582                                       field->parent_ip,
 583                                       flags))
 584                         goto partial;
 585         }
 586         if (!trace_seq_printf(s, "\n"))
 587                 goto partial;
 588
 589         return TRACE_TYPE_HANDLED;
 590
 591  partial:
 592         return TRACE_TYPE_PARTIAL_LINE;
 593 }
 594
 595 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 596 {
 597         struct ftrace_entry *field;
 598
 599         trace_assign_type(field, iter->ent);
 600
 601         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 602                               field->ip,
 603                               field->parent_ip))
 604                 return TRACE_TYPE_PARTIAL_LINE;
 605
 606         return TRACE_TYPE_HANDLED;
 607 }
 608
 609 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 610 {
 611         struct ftrace_entry *field;
 612         struct trace_seq *s = &iter->seq;
 613
 614         trace_assign_type(field, iter->ent);
 615
 616         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 617         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 618
 619         return TRACE_TYPE_HANDLED;
 620 }
 621
 622 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 623 {
 624         struct ftrace_entry *field;
 625         struct trace_seq *s = &iter->seq;
 626
 627         trace_assign_type(field, iter->ent);
 628
 629         SEQ_PUT_FIELD_RET(s, field->ip);
 630         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 631
 632         return TRACE_TYPE_HANDLED;
 633 }
 634
 635 static struct trace_event trace_fn_event = {
 636         .type           = TRACE_FN,
 637         .trace          = trace_fn_trace,
 638         .raw            = trace_fn_raw,
 639         .hex            = trace_fn_hex,
 640         .binary         = trace_fn_bin,
 641 };
 642
 643 /* TRACE_CTX an TRACE_WAKE */
 644 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 645                                              char *delim)
 646 {
 647         struct ctx_switch_entry *field;
 648         char comm[TASK_COMM_LEN];
 649         int S, T;
 650
 651
 652         trace_assign_type(field, iter->ent);
 653
 654         T = task_state_char(field->next_state);
 655         S = task_state_char(field->prev_state);
 656         trace_find_cmdline(field->next_pid, comm);
 657         if (!trace_seq_printf(&iter->seq,
 658                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 659                               field->prev_pid,
 660                               field->prev_prio,
 661                               S, delim,
 662                               field->next_cpu,
 663                               field->next_pid,
 664                               field->next_prio,
 665                               T, comm))
 666                 return TRACE_TYPE_PARTIAL_LINE;
 667
 668         return TRACE_TYPE_HANDLED;
 669 }
 670
 671 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 672 {
 673         return trace_ctxwake_print(iter, "==>");
 674 }
 675
 676 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 677                                           int flags)
 678 {
 679         return trace_ctxwake_print(iter, "  +");
 680 }
 681
 682 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 683 {
 684         struct ctx_switch_entry *field;
 685         int T;
 686
 687         trace_assign_type(field, iter->ent);
 688
 689         if (!S)
 690                 task_state_char(field->prev_state);
 691         T = task_state_char(field->next_state);
 692         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 693                               field->prev_pid,
 694                               field->prev_prio,
 695                               S,
 696                               field->next_cpu,
 697                               field->next_pid,
 698                               field->next_prio,
 699                               T))
 700                 return TRACE_TYPE_PARTIAL_LINE;
 701
 702         return TRACE_TYPE_HANDLED;
 703 }
 704
 705 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 706 {
 707         return trace_ctxwake_raw(iter, 0);
 708 }
 709
 710 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 711 {
 712         return trace_ctxwake_raw(iter, '+');
 713 }
 714
 715
 716 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 717 {
 718         struct ctx_switch_entry *field;
 719         struct trace_seq *s = &iter->seq;
 720         int T;
 721
 722         trace_assign_type(field, iter->ent);
 723
 724         if (!S)
 725                 task_state_char(field->prev_state);
 726         T = task_state_char(field->next_state);
 727
 728         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 729         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 730         SEQ_PUT_HEX_FIELD_RET(s, S);
 731         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 732         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 733         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 734         SEQ_PUT_HEX_FIELD_RET(s, T);
 735
 736         return TRACE_TYPE_HANDLED;
 737 }
 738
 739 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 740 {
 741         return trace_ctxwake_hex(iter, 0);
 742 }
 743
 744 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 745 {
 746         return trace_ctxwake_hex(iter, '+');
 747 }
 748
 749 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 750                                            int flags)
 751 {
 752         struct ctx_switch_entry *field;
 753         struct trace_seq *s = &iter->seq;
 754
 755         trace_assign_type(field, iter->ent);
 756
 757         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 758         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 759         SEQ_PUT_FIELD_RET(s, field->prev_state);
 760         SEQ_PUT_FIELD_RET(s, field->next_pid);
 761         SEQ_PUT_FIELD_RET(s, field->next_prio);
 762         SEQ_PUT_FIELD_RET(s, field->next_state);
 763
 764         return TRACE_TYPE_HANDLED;
 765 }
 766
 767 static struct trace_event trace_ctx_event = {
 768         .type           = TRACE_CTX,
 769         .trace          = trace_ctx_print,
 770         .raw            = trace_ctx_raw,
 771         .hex            = trace_ctx_hex,
 772         .binary         = trace_ctxwake_bin,
 773 };
 774
 775 static struct trace_event trace_wake_event = {
 776         .type           = TRACE_WAKE,
 777         .trace          = trace_wake_print,
 778         .raw            = trace_wake_raw,
 779         .hex            = trace_wake_hex,
 780         .binary         = trace_ctxwake_bin,
 781 };
 782
 783 /* TRACE_SPECIAL */
 784 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 785                                              int flags)
 786 {
 787         struct special_entry *field;
 788
 789         trace_assign_type(field, iter->ent);
 790
 791         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 792                               field->arg1,
 793                               field->arg2,
 794                               field->arg3))
 795                 return TRACE_TYPE_PARTIAL_LINE;
 796
 797         return TRACE_TYPE_HANDLED;
 798 }
 799
 800 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 801                                            int flags)
 802 {
 803         struct special_entry *field;
 804         struct trace_seq *s = &iter->seq;
 805
 806         trace_assign_type(field, iter->ent);
 807
 808         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 809         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 810         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 811
 812         return TRACE_TYPE_HANDLED;
 813 }
 814
 815 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 816                                            int flags)
 817 {
 818         struct special_entry *field;
 819         struct trace_seq *s = &iter->seq;
 820
 821         trace_assign_type(field, iter->ent);
 822
 823         SEQ_PUT_FIELD_RET(s, field->arg1);
 824         SEQ_PUT_FIELD_RET(s, field->arg2);
 825         SEQ_PUT_FIELD_RET(s, field->arg3);
 826
 827         return TRACE_TYPE_HANDLED;
 828 }
 829
 830 static struct trace_event trace_special_event = {
 831         .type           = TRACE_SPECIAL,
 832         .trace          = trace_special_print,
 833         .raw            = trace_special_print,
 834         .hex            = trace_special_hex,
 835         .binary         = trace_special_bin,
 836 };
 837
 838 /* TRACE_STACK */
 839
 840 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 841                                            int flags)
 842 {
 843         struct stack_entry *field;
 844         struct trace_seq *s = &iter->seq;
 845         int i;
 846
 847         trace_assign_type(field, iter->ent);
 848
 849         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 850                 if (i) {
 851                         if (!trace_seq_puts(s, " <= "))
 852                                 goto partial;
 853
 854                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 855                                 goto partial;
 856                 }
 857                 if (!trace_seq_puts(s, "\n"))
 858                         goto partial;
 859         }
 860
 861         return TRACE_TYPE_HANDLED;
 862
 863  partial:
 864         return TRACE_TYPE_PARTIAL_LINE;
 865 }
 866
 867 static struct trace_event trace_stack_event = {
 868         .type           = TRACE_STACK,
 869         .trace          = trace_stack_print,
 870         .raw            = trace_special_print,
 871         .hex            = trace_special_hex,
 872         .binary         = trace_special_bin,
 873 };
 874
 875 /* TRACE_USER_STACK */
 876 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 877                                                 int flags)
 878 {
 879         struct userstack_entry *field;
 880         struct trace_seq *s = &iter->seq;
 881
 882         trace_assign_type(field, iter->ent);
 883
 884         if (!seq_print_userip_objs(field, s, flags))
 885                 goto partial;
 886
 887         if (!trace_seq_putc(s, '\n'))
 888                 goto partial;
 889
 890         return TRACE_TYPE_HANDLED;
 891
 892  partial:
 893         return TRACE_TYPE_PARTIAL_LINE;
 894 }
 895
 896 static struct trace_event trace_user_stack_event = {
 897         .type           = TRACE_USER_STACK,
 898         .trace          = trace_user_stack_print,
 899         .raw            = trace_special_print,
 900         .hex            = trace_special_hex,
 901         .binary         = trace_special_bin,
 902 };
 903
 904 /* TRACE_BPRINT */
 905 static enum print_line_t
 906 trace_bprint_print(struct trace_iterator *iter, int flags)
 907 {
 908         struct trace_entry *entry = iter->ent;
 909         struct trace_seq *s = &iter->seq;
 910         struct bprint_entry *field;
 911
 912         trace_assign_type(field, entry);
 913
 914         if (!seq_print_ip_sym(s, field->ip, flags))
 915                 goto partial;
 916
 917         if (!trace_seq_puts(s, ": "))
 918                 goto partial;
 919
 920         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 921                 goto partial;
 922
 923         return TRACE_TYPE_HANDLED;
 924
 925  partial:
 926         return TRACE_TYPE_PARTIAL_LINE;
 927 }
 928
 929
 930 static enum print_line_t
 931 trace_bprint_raw(struct trace_iterator *iter, int flags)
 932 {
 933         struct bprint_entry *field;
 934         struct trace_seq *s = &iter->seq;
 935
 936         trace_assign_type(field, iter->ent);
 937
 938         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 939                 goto partial;
 940
 941         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 942                 goto partial;
 943
 944         return TRACE_TYPE_HANDLED;
 945
 946  partial:
 947         return TRACE_TYPE_PARTIAL_LINE;
 948 }
 949
 950
 951 static struct trace_event trace_bprint_event = {
 952         .type           = TRACE_BPRINT,
 953         .trace          = trace_bprint_print,
 954         .raw            = trace_bprint_raw,
 955 };
 956
 957 /* TRACE_PRINT */
 958 static enum print_line_t trace_print_print(struct trace_iterator *iter,
 959                                            int flags)
 960 {
 961         struct print_entry *field;
 962         struct trace_seq *s = &iter->seq;
 963
 964         trace_assign_type(field, iter->ent);
 965
 966         if (!seq_print_ip_sym(s, field->ip, flags))
 967                 goto partial;
 968
 969         if (!trace_seq_printf(s, ": %s", field->buf))
 970                 goto partial;
 971
 972         return TRACE_TYPE_HANDLED;
 973
 974  partial:
 975         return TRACE_TYPE_PARTIAL_LINE;
 976 }
 977
 978 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 979 {
 980         struct print_entry *field;
 981
 982         trace_assign_type(field, iter->ent);
 983
 984         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 985                 goto partial;
 986
 987         return TRACE_TYPE_HANDLED;
 988
 989  partial:
 990         return TRACE_TYPE_PARTIAL_LINE;
 991 }
 992
 993 static struct trace_event trace_print_event = {
 994         .type           = TRACE_PRINT,
 995         .trace          = trace_print_print,
 996         .raw            = trace_print_raw,
 997 };
 998
 999
1000 static struct trace_event *events[] __initdata = {
1001         &trace_fn_event,
1002         &trace_ctx_event,
1003         &trace_wake_event,
1004         &trace_special_event,
1005         &trace_stack_event,
1006         &trace_user_stack_event,
1007         &trace_bprint_event,
1008         &trace_print_event,
1009         NULL
1010 };
1011
1012 __init static int init_events(void)
1013 {
1014         struct trace_event *event;
1015         int i, ret;
1016
1017         for (i = 0; events[i]; i++) {
1018                 event = events[i];
1019
1020                 ret = register_ftrace_event(event);
1021                 if (!ret) {
1022                         printk(KERN_WARNING "event %d failed to register\n",
1023                                event->type);
1024                         WARN_ON_ONCE(1);
1025                 }
1026         }
1027
1028         return 0;
1029 }
1030 device_initcall(init_events);