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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 DECLARE_RWSEM(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  * Called with trace_event_read_lock() held.
 470  */
 471 struct trace_event *ftrace_find_event(int type)
 472 {
 473         struct trace_event *event;
 474         struct hlist_node *n;
 475         unsigned key;
 476
 477         key = type & (EVENT_HASHSIZE - 1);
 478
 479         hlist_for_each_entry(event, n, &event_hash[key], node) {
 480                 if (event->type == type)
 481                         return event;
 482         }
 483
 484         return NULL;
 485 }
 486
 487 static LIST_HEAD(ftrace_event_list);
 488
 489 static int trace_search_list(struct list_head **list)
 490 {
 491         struct trace_event *e;
 492         int last = __TRACE_LAST_TYPE;
 493
 494         if (list_empty(&ftrace_event_list)) {
 495                 *list = &ftrace_event_list;
 496                 return last + 1;
 497         }
 498
 499         /*
 500          * We used up all possible max events,
 501          * lets see if somebody freed one.
 502          */
 503         list_for_each_entry(e, &ftrace_event_list, list) {
 504                 if (e->type != last + 1)
 505                         break;
 506                 last++;
 507         }
 508
 509         /* Did we used up all 65 thousand events??? */
 510         if ((last + 1) > FTRACE_MAX_EVENT)
 511                 return 0;
 512
 513         *list = &e->list;
 514         return last + 1;
 515 }
 516
 517 void trace_event_read_lock(void)
 518 {
 519         down_read(&trace_event_mutex);
 520 }
 521
 522 void trace_event_read_unlock(void)
 523 {
 524         up_read(&trace_event_mutex);
 525 }
 526
 527 /**
 528  * register_ftrace_event - register output for an event type
 529  * @event: the event type to register
 530  *
 531  * Event types are stored in a hash and this hash is used to
 532  * find a way to print an event. If the @event->type is set
 533  * then it will use that type, otherwise it will assign a
 534  * type to use.
 535  *
 536  * If you assign your own type, please make sure it is added
 537  * to the trace_type enum in trace.h, to avoid collisions
 538  * with the dynamic types.
 539  *
 540  * Returns the event type number or zero on error.
 541  */
 542 int register_ftrace_event(struct trace_event *event)
 543 {
 544         unsigned key;
 545         int ret = 0;
 546
 547         down_write(&trace_event_mutex);
 548
 549         if (WARN_ON(!event))
 550                 goto out;
 551
 552         INIT_LIST_HEAD(&event->list);
 553
 554         if (!event->type) {
 555                 struct list_head *list = NULL;
 556
 557                 if (next_event_type > FTRACE_MAX_EVENT) {
 558
 559                         event->type = trace_search_list(&list);
 560                         if (!event->type)
 561                                 goto out;
 562
 563                 } else {
 564
 565                         event->type = next_event_type++;
 566                         list = &ftrace_event_list;
 567                 }
 568
 569                 if (WARN_ON(ftrace_find_event(event->type)))
 570                         goto out;
 571
 572                 list_add_tail(&event->list, list);
 573
 574         } else if (event->type > __TRACE_LAST_TYPE) {
 575                 printk(KERN_WARNING "Need to add type to trace.h\n");
 576                 WARN_ON(1);
 577                 goto out;
 578         } else {
 579                 /* Is this event already used */
 580                 if (ftrace_find_event(event->type))
 581                         goto out;
 582         }
 583
 584         if (event->trace == NULL)
 585                 event->trace = trace_nop_print;
 586         if (event->raw == NULL)
 587                 event->raw = trace_nop_print;
 588         if (event->hex == NULL)
 589                 event->hex = trace_nop_print;
 590         if (event->binary == NULL)
 591                 event->binary = trace_nop_print;
 592
 593         key = event->type & (EVENT_HASHSIZE - 1);
 594
 595         hlist_add_head(&event->node, &event_hash[key]);
 596
 597         ret = event->type;
 598  out:
 599         up_write(&trace_event_mutex);
 600
 601         return ret;
 602 }
 603 EXPORT_SYMBOL_GPL(register_ftrace_event);
 604
 605 /**
 606  * unregister_ftrace_event - remove a no longer used event
 607  * @event: the event to remove
 608  */
 609 int unregister_ftrace_event(struct trace_event *event)
 610 {
 611         down_write(&trace_event_mutex);
 612         hlist_del(&event->node);
 613         list_del(&event->list);
 614         up_write(&trace_event_mutex);
 615
 616         return 0;
 617 }
 618 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 619
 620 /*
 621  * Standard events
 622  */
 623
 624 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 625 {
 626         return TRACE_TYPE_HANDLED;
 627 }
 628
 629 /* TRACE_FN */
 630 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 631 {
 632         struct ftrace_entry *field;
 633         struct trace_seq *s = &iter->seq;
 634
 635         trace_assign_type(field, iter->ent);
 636
 637         if (!seq_print_ip_sym(s, field->ip, flags))
 638                 goto partial;
 639
 640         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 641                 if (!trace_seq_printf(s, " <-"))
 642                         goto partial;
 643                 if (!seq_print_ip_sym(s,
 644                                       field->parent_ip,
 645                                       flags))
 646                         goto partial;
 647         }
 648         if (!trace_seq_printf(s, "\n"))
 649                 goto partial;
 650
 651         return TRACE_TYPE_HANDLED;
 652
 653  partial:
 654         return TRACE_TYPE_PARTIAL_LINE;
 655 }
 656
 657 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 658 {
 659         struct ftrace_entry *field;
 660
 661         trace_assign_type(field, iter->ent);
 662
 663         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 664                               field->ip,
 665                               field->parent_ip))
 666                 return TRACE_TYPE_PARTIAL_LINE;
 667
 668         return TRACE_TYPE_HANDLED;
 669 }
 670
 671 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 672 {
 673         struct ftrace_entry *field;
 674         struct trace_seq *s = &iter->seq;
 675
 676         trace_assign_type(field, iter->ent);
 677
 678         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 679         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 680
 681         return TRACE_TYPE_HANDLED;
 682 }
 683
 684 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 685 {
 686         struct ftrace_entry *field;
 687         struct trace_seq *s = &iter->seq;
 688
 689         trace_assign_type(field, iter->ent);
 690
 691         SEQ_PUT_FIELD_RET(s, field->ip);
 692         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 693
 694         return TRACE_TYPE_HANDLED;
 695 }
 696
 697 static struct trace_event trace_fn_event = {
 698         .type           = TRACE_FN,
 699         .trace          = trace_fn_trace,
 700         .raw            = trace_fn_raw,
 701         .hex            = trace_fn_hex,
 702         .binary         = trace_fn_bin,
 703 };
 704
 705 /* TRACE_CTX an TRACE_WAKE */
 706 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 707                                              char *delim)
 708 {
 709         struct ctx_switch_entry *field;
 710         char comm[TASK_COMM_LEN];
 711         int S, T;
 712
 713
 714         trace_assign_type(field, iter->ent);
 715
 716         T = task_state_char(field->next_state);
 717         S = task_state_char(field->prev_state);
 718         trace_find_cmdline(field->next_pid, comm);
 719         if (!trace_seq_printf(&iter->seq,
 720                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 721                               field->prev_pid,
 722                               field->prev_prio,
 723                               S, delim,
 724                               field->next_cpu,
 725                               field->next_pid,
 726                               field->next_prio,
 727                               T, comm))
 728                 return TRACE_TYPE_PARTIAL_LINE;
 729
 730         return TRACE_TYPE_HANDLED;
 731 }
 732
 733 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 734 {
 735         return trace_ctxwake_print(iter, "==>");
 736 }
 737
 738 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 739                                           int flags)
 740 {
 741         return trace_ctxwake_print(iter, "  +");
 742 }
 743
 744 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 745 {
 746         struct ctx_switch_entry *field;
 747         int T;
 748
 749         trace_assign_type(field, iter->ent);
 750
 751         if (!S)
 752                 task_state_char(field->prev_state);
 753         T = task_state_char(field->next_state);
 754         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 755                               field->prev_pid,
 756                               field->prev_prio,
 757                               S,
 758                               field->next_cpu,
 759                               field->next_pid,
 760                               field->next_prio,
 761                               T))
 762                 return TRACE_TYPE_PARTIAL_LINE;
 763
 764         return TRACE_TYPE_HANDLED;
 765 }
 766
 767 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 768 {
 769         return trace_ctxwake_raw(iter, 0);
 770 }
 771
 772 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 773 {
 774         return trace_ctxwake_raw(iter, '+');
 775 }
 776
 777
 778 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 779 {
 780         struct ctx_switch_entry *field;
 781         struct trace_seq *s = &iter->seq;
 782         int T;
 783
 784         trace_assign_type(field, iter->ent);
 785
 786         if (!S)
 787                 task_state_char(field->prev_state);
 788         T = task_state_char(field->next_state);
 789
 790         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 791         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 792         SEQ_PUT_HEX_FIELD_RET(s, S);
 793         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 794         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 795         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 796         SEQ_PUT_HEX_FIELD_RET(s, T);
 797
 798         return TRACE_TYPE_HANDLED;
 799 }
 800
 801 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 802 {
 803         return trace_ctxwake_hex(iter, 0);
 804 }
 805
 806 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 807 {
 808         return trace_ctxwake_hex(iter, '+');
 809 }
 810
 811 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 812                                            int flags)
 813 {
 814         struct ctx_switch_entry *field;
 815         struct trace_seq *s = &iter->seq;
 816
 817         trace_assign_type(field, iter->ent);
 818
 819         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 820         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 821         SEQ_PUT_FIELD_RET(s, field->prev_state);
 822         SEQ_PUT_FIELD_RET(s, field->next_pid);
 823         SEQ_PUT_FIELD_RET(s, field->next_prio);
 824         SEQ_PUT_FIELD_RET(s, field->next_state);
 825
 826         return TRACE_TYPE_HANDLED;
 827 }
 828
 829 static struct trace_event trace_ctx_event = {
 830         .type           = TRACE_CTX,
 831         .trace          = trace_ctx_print,
 832         .raw            = trace_ctx_raw,
 833         .hex            = trace_ctx_hex,
 834         .binary         = trace_ctxwake_bin,
 835 };
 836
 837 static struct trace_event trace_wake_event = {
 838         .type           = TRACE_WAKE,
 839         .trace          = trace_wake_print,
 840         .raw            = trace_wake_raw,
 841         .hex            = trace_wake_hex,
 842         .binary         = trace_ctxwake_bin,
 843 };
 844
 845 /* TRACE_SPECIAL */
 846 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 847                                              int flags)
 848 {
 849         struct special_entry *field;
 850
 851         trace_assign_type(field, iter->ent);
 852
 853         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 854                               field->arg1,
 855                               field->arg2,
 856                               field->arg3))
 857                 return TRACE_TYPE_PARTIAL_LINE;
 858
 859         return TRACE_TYPE_HANDLED;
 860 }
 861
 862 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 863                                            int flags)
 864 {
 865         struct special_entry *field;
 866         struct trace_seq *s = &iter->seq;
 867
 868         trace_assign_type(field, iter->ent);
 869
 870         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 871         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 872         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 873
 874         return TRACE_TYPE_HANDLED;
 875 }
 876
 877 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 878                                            int flags)
 879 {
 880         struct special_entry *field;
 881         struct trace_seq *s = &iter->seq;
 882
 883         trace_assign_type(field, iter->ent);
 884
 885         SEQ_PUT_FIELD_RET(s, field->arg1);
 886         SEQ_PUT_FIELD_RET(s, field->arg2);
 887         SEQ_PUT_FIELD_RET(s, field->arg3);
 888
 889         return TRACE_TYPE_HANDLED;
 890 }
 891
 892 static struct trace_event trace_special_event = {
 893         .type           = TRACE_SPECIAL,
 894         .trace          = trace_special_print,
 895         .raw            = trace_special_print,
 896         .hex            = trace_special_hex,
 897         .binary         = trace_special_bin,
 898 };
 899
 900 /* TRACE_STACK */
 901
 902 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 903                                            int flags)
 904 {
 905         struct stack_entry *field;
 906         struct trace_seq *s = &iter->seq;
 907         int i;
 908
 909         trace_assign_type(field, iter->ent);
 910
 911         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 912                 if (!field->caller[i])
 913                         break;
 914                 if (i) {
 915                         if (!trace_seq_puts(s, " <= "))
 916                                 goto partial;
 917
 918                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 919                                 goto partial;
 920                 }
 921                 if (!trace_seq_puts(s, "\n"))
 922                         goto partial;
 923         }
 924
 925         return TRACE_TYPE_HANDLED;
 926
 927  partial:
 928         return TRACE_TYPE_PARTIAL_LINE;
 929 }
 930
 931 static struct trace_event trace_stack_event = {
 932         .type           = TRACE_STACK,
 933         .trace          = trace_stack_print,
 934         .raw            = trace_special_print,
 935         .hex            = trace_special_hex,
 936         .binary         = trace_special_bin,
 937 };
 938
 939 /* TRACE_USER_STACK */
 940 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 941                                                 int flags)
 942 {
 943         struct userstack_entry *field;
 944         struct trace_seq *s = &iter->seq;
 945
 946         trace_assign_type(field, iter->ent);
 947
 948         if (!seq_print_userip_objs(field, s, flags))
 949                 goto partial;
 950
 951         if (!trace_seq_putc(s, '\n'))
 952                 goto partial;
 953
 954         return TRACE_TYPE_HANDLED;
 955
 956  partial:
 957         return TRACE_TYPE_PARTIAL_LINE;
 958 }
 959
 960 static struct trace_event trace_user_stack_event = {
 961         .type           = TRACE_USER_STACK,
 962         .trace          = trace_user_stack_print,
 963         .raw            = trace_special_print,
 964         .hex            = trace_special_hex,
 965         .binary         = trace_special_bin,
 966 };
 967
 968 /* TRACE_BPRINT */
 969 static enum print_line_t
 970 trace_bprint_print(struct trace_iterator *iter, int flags)
 971 {
 972         struct trace_entry *entry = iter->ent;
 973         struct trace_seq *s = &iter->seq;
 974         struct bprint_entry *field;
 975
 976         trace_assign_type(field, entry);
 977
 978         if (!seq_print_ip_sym(s, field->ip, flags))
 979                 goto partial;
 980
 981         if (!trace_seq_puts(s, ": "))
 982                 goto partial;
 983
 984         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 985                 goto partial;
 986
 987         return TRACE_TYPE_HANDLED;
 988
 989  partial:
 990         return TRACE_TYPE_PARTIAL_LINE;
 991 }
 992
 993
 994 static enum print_line_t
 995 trace_bprint_raw(struct trace_iterator *iter, int flags)
 996 {
 997         struct bprint_entry *field;
 998         struct trace_seq *s = &iter->seq;
 999
1000         trace_assign_type(field, iter->ent);
1001
1002         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1003                 goto partial;
1004
1005         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1006                 goto partial;
1007
1008         return TRACE_TYPE_HANDLED;
1009
1010  partial:
1011         return TRACE_TYPE_PARTIAL_LINE;
1012 }
1013
1014
1015 static struct trace_event trace_bprint_event = {
1016         .type           = TRACE_BPRINT,
1017         .trace          = trace_bprint_print,
1018         .raw            = trace_bprint_raw,
1019 };
1020
1021 /* TRACE_PRINT */
1022 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1023                                            int flags)
1024 {
1025         struct print_entry *field;
1026         struct trace_seq *s = &iter->seq;
1027
1028         trace_assign_type(field, iter->ent);
1029
1030         if (!seq_print_ip_sym(s, field->ip, flags))
1031                 goto partial;
1032
1033         if (!trace_seq_printf(s, ": %s", field->buf))
1034                 goto partial;
1035
1036         return TRACE_TYPE_HANDLED;
1037
1038  partial:
1039         return TRACE_TYPE_PARTIAL_LINE;
1040 }
1041
1042 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1043 {
1044         struct print_entry *field;
1045
1046         trace_assign_type(field, iter->ent);
1047
1048         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1049                 goto partial;
1050
1051         return TRACE_TYPE_HANDLED;
1052
1053  partial:
1054         return TRACE_TYPE_PARTIAL_LINE;
1055 }
1056
1057 static struct trace_event trace_print_event = {
1058         .type           = TRACE_PRINT,
1059         .trace          = trace_print_print,
1060         .raw            = trace_print_raw,
1061 };
1062
1063
1064 static struct trace_event *events[] __initdata = {
1065         &trace_fn_event,
1066         &trace_ctx_event,
1067         &trace_wake_event,
1068         &trace_special_event,
1069         &trace_stack_event,
1070         &trace_user_stack_event,
1071         &trace_bprint_event,
1072         &trace_print_event,
1073         NULL
1074 };
1075
1076 __init static int init_events(void)
1077 {
1078         struct trace_event *event;
1079         int i, ret;
1080
1081         for (i = 0; events[i]; i++) {
1082                 event = events[i];
1083
1084                 ret = register_ftrace_event(event);
1085                 if (!ret) {
1086                         printk(KERN_WARNING "event %d failed to register\n",
1087                                event->type);
1088                         WARN_ON_ONCE(1);
1089                 }
1090         }
1091
1092         return 0;
1093 }
1094 device_initcall(init_events);