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 DECLARE_RWSEM(trace_event_mutex);
  18
  19 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
  20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
  21
  22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  23
  24 static int next_event_type = __TRACE_LAST_TYPE + 1;
  25
  26 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  27 {
  28         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  29
  30         seq_write(m, s->buffer, len);
  31
  32         trace_seq_init(s);
  33 }
  34
  35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  36 {
  37         struct trace_seq *s = &iter->seq;
  38         struct trace_entry *entry = iter->ent;
  39         struct bprint_entry *field;
  40         int ret;
  41
  42         trace_assign_type(field, entry);
  43
  44         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  45         if (!ret)
  46                 return TRACE_TYPE_PARTIAL_LINE;
  47
  48         return TRACE_TYPE_HANDLED;
  49 }
  50
  51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  52 {
  53         struct trace_seq *s = &iter->seq;
  54         struct trace_entry *entry = iter->ent;
  55         struct print_entry *field;
  56         int ret;
  57
  58         trace_assign_type(field, entry);
  59
  60         ret = trace_seq_printf(s, "%s", field->buf);
  61         if (!ret)
  62                 return TRACE_TYPE_PARTIAL_LINE;
  63
  64         return TRACE_TYPE_HANDLED;
  65 }
  66
  67 /**
  68  * trace_seq_printf - sequence printing of trace information
  69  * @s: trace sequence descriptor
  70  * @fmt: printf format string
  71  *
  72  * The tracer may use either sequence operations or its own
  73  * copy to user routines. To simplify formating of a trace
  74  * trace_seq_printf is used to store strings into a special
  75  * buffer (@s). Then the output may be either used by
  76  * the sequencer or pulled into another buffer.
  77  */
  78 int
  79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  80 {
  81         int len = (PAGE_SIZE - 1) - s->len;
  82         va_list ap;
  83         int ret;
  84
  85         if (!len)
  86                 return 0;
  87
  88         va_start(ap, fmt);
  89         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  90         va_end(ap);
  91
  92         /* If we can't write it all, don't bother writing anything */
  93         if (ret >= len)
  94                 return 0;
  95
  96         s->len += ret;
  97
  98         return len;
  99 }
 100 EXPORT_SYMBOL_GPL(trace_seq_printf);
 101
 102 /**
 103  * trace_seq_vprintf - sequence printing of trace information
 104  * @s: trace sequence descriptor
 105  * @fmt: printf format string
 106  *
 107  * The tracer may use either sequence operations or its own
 108  * copy to user routines. To simplify formating of a trace
 109  * trace_seq_printf is used to store strings into a special
 110  * buffer (@s). Then the output may be either used by
 111  * the sequencer or pulled into another buffer.
 112  */
 113 int
 114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 115 {
 116         int len = (PAGE_SIZE - 1) - s->len;
 117         int ret;
 118
 119         if (!len)
 120                 return 0;
 121
 122         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 123
 124         /* If we can't write it all, don't bother writing anything */
 125         if (ret >= len)
 126                 return 0;
 127
 128         s->len += ret;
 129
 130         return len;
 131 }
 132 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 133
 134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 135 {
 136         int len = (PAGE_SIZE - 1) - s->len;
 137         int ret;
 138
 139         if (!len)
 140                 return 0;
 141
 142         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 143
 144         /* If we can't write it all, don't bother writing anything */
 145         if (ret >= len)
 146                 return 0;
 147
 148         s->len += ret;
 149
 150         return len;
 151 }
 152
 153 /**
 154  * trace_seq_puts - trace sequence printing of simple string
 155  * @s: trace sequence descriptor
 156  * @str: simple string to record
 157  *
 158  * The tracer may use either the sequence operations or its own
 159  * copy to user routines. This function records a simple string
 160  * into a special buffer (@s) for later retrieval by a sequencer
 161  * or other mechanism.
 162  */
 163 int trace_seq_puts(struct trace_seq *s, const char *str)
 164 {
 165         int len = strlen(str);
 166
 167         if (len > ((PAGE_SIZE - 1) - s->len))
 168                 return 0;
 169
 170         memcpy(s->buffer + s->len, str, len);
 171         s->len += len;
 172
 173         return len;
 174 }
 175
 176 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 177 {
 178         if (s->len >= (PAGE_SIZE - 1))
 179                 return 0;
 180
 181         s->buffer[s->len++] = c;
 182
 183         return 1;
 184 }
 185
 186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 187 {
 188         if (len > ((PAGE_SIZE - 1) - s->len))
 189                 return 0;
 190
 191         memcpy(s->buffer + s->len, mem, len);
 192         s->len += len;
 193
 194         return len;
 195 }
 196
 197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 198 {
 199         unsigned char hex[HEX_CHARS];
 200         const unsigned char *data = mem;
 201         int i, j;
 202
 203 #ifdef __BIG_ENDIAN
 204         for (i = 0, j = 0; i < len; i++) {
 205 #else
 206         for (i = len-1, j = 0; i >= 0; i--) {
 207 #endif
 208                 hex[j++] = hex_asc_hi(data[i]);
 209                 hex[j++] = hex_asc_lo(data[i]);
 210         }
 211         hex[j++] = ' ';
 212
 213         return trace_seq_putmem(s, hex, j);
 214 }
 215
 216 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 217 {
 218         void *ret;
 219
 220         if (len > ((PAGE_SIZE - 1) - s->len))
 221                 return NULL;
 222
 223         ret = s->buffer + s->len;
 224         s->len += len;
 225
 226         return ret;
 227 }
 228
 229 int trace_seq_path(struct trace_seq *s, struct path *path)
 230 {
 231         unsigned char *p;
 232
 233         if (s->len >= (PAGE_SIZE - 1))
 234                 return 0;
 235         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 236         if (!IS_ERR(p)) {
 237                 p = mangle_path(s->buffer + s->len, p, "\n");
 238                 if (p) {
 239                         s->len = p - s->buffer;
 240                         return 1;
 241                 }
 242         } else {
 243                 s->buffer[s->len++] = '?';
 244                 return 1;
 245         }
 246
 247         return 0;
 248 }
 249
 250 const char *
 251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 252                        unsigned long flags,
 253                        const struct trace_print_flags *flag_array)
 254 {
 255         unsigned long mask;
 256         const char *str;
 257         const char *ret = p->buffer + p->len;
 258         int i;
 259
 260         for (i = 0;  flag_array[i].name && flags; i++) {
 261
 262                 mask = flag_array[i].mask;
 263                 if ((flags & mask) != mask)
 264                         continue;
 265
 266                 str = flag_array[i].name;
 267                 flags &= ~mask;
 268                 if (p->len && delim)
 269                         trace_seq_puts(p, delim);
 270                 trace_seq_puts(p, str);
 271         }
 272
 273         /* check for left over flags */
 274         if (flags) {
 275                 if (p->len && delim)
 276                         trace_seq_puts(p, delim);
 277                 trace_seq_printf(p, "0x%lx", flags);
 278         }
 279
 280         trace_seq_putc(p, 0);
 281
 282         return ret;
 283 }
 284 EXPORT_SYMBOL(ftrace_print_flags_seq);
 285
 286 const char *
 287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 288                          const struct trace_print_flags *symbol_array)
 289 {
 290         int i;
 291         const char *ret = p->buffer + p->len;
 292
 293         for (i = 0;  symbol_array[i].name; i++) {
 294
 295                 if (val != symbol_array[i].mask)
 296                         continue;
 297
 298                 trace_seq_puts(p, symbol_array[i].name);
 299                 break;
 300         }
 301
 302         if (!p->len)
 303                 trace_seq_printf(p, "0x%lx", val);
 304
 305         trace_seq_putc(p, 0);
 306
 307         return ret;
 308 }
 309 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 310
 311 #ifdef CONFIG_KRETPROBES
 312 static inline const char *kretprobed(const char *name)
 313 {
 314         static const char tramp_name[] = "kretprobe_trampoline";
 315         int size = sizeof(tramp_name);
 316
 317         if (strncmp(tramp_name, name, size) == 0)
 318                 return "[unknown/kretprobe'd]";
 319         return name;
 320 }
 321 #else
 322 static inline const char *kretprobed(const char *name)
 323 {
 324         return name;
 325 }
 326 #endif /* CONFIG_KRETPROBES */
 327
 328 static int
 329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 330 {
 331 #ifdef CONFIG_KALLSYMS
 332         char str[KSYM_SYMBOL_LEN];
 333         const char *name;
 334
 335         kallsyms_lookup(address, NULL, NULL, NULL, str);
 336
 337         name = kretprobed(str);
 338
 339         return trace_seq_printf(s, fmt, name);
 340 #endif
 341         return 1;
 342 }
 343
 344 static int
 345 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 346                      unsigned long address)
 347 {
 348 #ifdef CONFIG_KALLSYMS
 349         char str[KSYM_SYMBOL_LEN];
 350         const char *name;
 351
 352         sprint_symbol(str, address);
 353         name = kretprobed(str);
 354
 355         return trace_seq_printf(s, fmt, name);
 356 #endif
 357         return 1;
 358 }
 359
 360 #ifndef CONFIG_64BIT
 361 # define IP_FMT "%08lx"
 362 #else
 363 # define IP_FMT "%016lx"
 364 #endif
 365
 366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 367                       unsigned long ip, unsigned long sym_flags)
 368 {
 369         struct file *file = NULL;
 370         unsigned long vmstart = 0;
 371         int ret = 1;
 372
 373         if (mm) {
 374                 const struct vm_area_struct *vma;
 375
 376                 down_read(&mm->mmap_sem);
 377                 vma = find_vma(mm, ip);
 378                 if (vma) {
 379                         file = vma->vm_file;
 380                         vmstart = vma->vm_start;
 381                 }
 382                 if (file) {
 383                         ret = trace_seq_path(s, &file->f_path);
 384                         if (ret)
 385                                 ret = trace_seq_printf(s, "[+0x%lx]",
 386                                                        ip - vmstart);
 387                 }
 388                 up_read(&mm->mmap_sem);
 389         }
 390         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 391                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 392         return ret;
 393 }
 394
 395 int
 396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 397                       unsigned long sym_flags)
 398 {
 399         struct mm_struct *mm = NULL;
 400         int ret = 1;
 401         unsigned int i;
 402
 403         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 404                 struct task_struct *task;
 405                 /*
 406                  * we do the lookup on the thread group leader,
 407                  * since individual threads might have already quit!
 408                  */
 409                 rcu_read_lock();
 410                 task = find_task_by_vpid(entry->ent.tgid);
 411                 if (task)
 412                         mm = get_task_mm(task);
 413                 rcu_read_unlock();
 414         }
 415
 416         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 417                 unsigned long ip = entry->caller[i];
 418
 419                 if (ip == ULONG_MAX || !ret)
 420                         break;
 421                 if (ret)
 422                         ret = trace_seq_puts(s, " => ");
 423                 if (!ip) {
 424                         if (ret)
 425                                 ret = trace_seq_puts(s, "??");
 426                         if (ret)
 427                                 ret = trace_seq_puts(s, "\n");
 428                         continue;
 429                 }
 430                 if (!ret)
 431                         break;
 432                 if (ret)
 433                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 434                 ret = trace_seq_puts(s, "\n");
 435         }
 436
 437         if (mm)
 438                 mmput(mm);
 439         return ret;
 440 }
 441
 442 int
 443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 444 {
 445         int ret;
 446
 447         if (!ip)
 448                 return trace_seq_printf(s, "0");
 449
 450         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 451                 ret = seq_print_sym_offset(s, "%s", ip);
 452         else
 453                 ret = seq_print_sym_short(s, "%s", ip);
 454
 455         if (!ret)
 456                 return 0;
 457
 458         if (sym_flags & TRACE_ITER_SYM_ADDR)
 459                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 460         return ret;
 461 }
 462
 463 static int
 464 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 465 {
 466         int hardirq, softirq;
 467         char comm[TASK_COMM_LEN];
 468
 469         trace_find_cmdline(entry->pid, comm);
 470         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 471         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 472
 473         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 474                               comm, entry->pid, cpu,
 475                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 476                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 477                                   'X' : '.',
 478                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 479                                 'N' : '.',
 480                               (hardirq && softirq) ? 'H' :
 481                                 hardirq ? 'h' : softirq ? 's' : '.'))
 482                 return 0;
 483
 484         if (entry->preempt_count)
 485                 return trace_seq_printf(s, "%x", entry->preempt_count);
 486         return trace_seq_puts(s, ".");
 487 }
 488
 489 static unsigned long preempt_mark_thresh = 100;
 490
 491 static int
 492 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 493                     unsigned long rel_usecs)
 494 {
 495         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 496                                 rel_usecs > preempt_mark_thresh ? '!' :
 497                                   rel_usecs > 1 ? '+' : ' ');
 498 }
 499
 500 int trace_print_context(struct trace_iterator *iter)
 501 {
 502         struct trace_seq *s = &iter->seq;
 503         struct trace_entry *entry = iter->ent;
 504         unsigned long long t = ns2usecs(iter->ts);
 505         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 506         unsigned long secs = (unsigned long)t;
 507         char comm[TASK_COMM_LEN];
 508
 509         trace_find_cmdline(entry->pid, comm);
 510
 511         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 512                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 513 }
 514
 515 int trace_print_lat_context(struct trace_iterator *iter)
 516 {
 517         u64 next_ts;
 518         int ret;
 519         struct trace_seq *s = &iter->seq;
 520         struct trace_entry *entry = iter->ent,
 521                            *next_entry = trace_find_next_entry(iter, NULL,
 522                                                                &next_ts);
 523         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 524         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 525         unsigned long rel_usecs;
 526
 527         if (!next_entry)
 528                 next_ts = iter->ts;
 529         rel_usecs = ns2usecs(next_ts - iter->ts);
 530
 531         if (verbose) {
 532                 char comm[TASK_COMM_LEN];
 533
 534                 trace_find_cmdline(entry->pid, comm);
 535
 536                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 537                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 538                                        entry->pid, iter->cpu, entry->flags,
 539                                        entry->preempt_count, iter->idx,
 540                                        ns2usecs(iter->ts),
 541                                        abs_usecs / USEC_PER_MSEC,
 542                                        abs_usecs % USEC_PER_MSEC,
 543                                        rel_usecs / USEC_PER_MSEC,
 544                                        rel_usecs % USEC_PER_MSEC);
 545         } else {
 546                 ret = lat_print_generic(s, entry, iter->cpu);
 547                 if (ret)
 548                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 549         }
 550
 551         return ret;
 552 }
 553
 554 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 555
 556 static int task_state_char(unsigned long state)
 557 {
 558         int bit = state ? __ffs(state) + 1 : 0;
 559
 560         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 561 }
 562
 563 /**
 564  * ftrace_find_event - find a registered event
 565  * @type: the type of event to look for
 566  *
 567  * Returns an event of type @type otherwise NULL
 568  * Called with trace_event_read_lock() held.
 569  */
 570 struct trace_event *ftrace_find_event(int type)
 571 {
 572         struct trace_event *event;
 573         struct hlist_node *n;
 574         unsigned key;
 575
 576         key = type & (EVENT_HASHSIZE - 1);
 577
 578         hlist_for_each_entry(event, n, &event_hash[key], node) {
 579                 if (event->type == type)
 580                         return event;
 581         }
 582
 583         return NULL;
 584 }
 585
 586 static LIST_HEAD(ftrace_event_list);
 587
 588 static int trace_search_list(struct list_head **list)
 589 {
 590         struct trace_event *e;
 591         int last = __TRACE_LAST_TYPE;
 592
 593         if (list_empty(&ftrace_event_list)) {
 594                 *list = &ftrace_event_list;
 595                 return last + 1;
 596         }
 597
 598         /*
 599          * We used up all possible max events,
 600          * lets see if somebody freed one.
 601          */
 602         list_for_each_entry(e, &ftrace_event_list, list) {
 603                 if (e->type != last + 1)
 604                         break;
 605                 last++;
 606         }
 607
 608         /* Did we used up all 65 thousand events??? */
 609         if ((last + 1) > FTRACE_MAX_EVENT)
 610                 return 0;
 611
 612         *list = &e->list;
 613         return last + 1;
 614 }
 615
 616 void trace_event_read_lock(void)
 617 {
 618         down_read(&trace_event_mutex);
 619 }
 620
 621 void trace_event_read_unlock(void)
 622 {
 623         up_read(&trace_event_mutex);
 624 }
 625
 626 /**
 627  * register_ftrace_event - register output for an event type
 628  * @event: the event type to register
 629  *
 630  * Event types are stored in a hash and this hash is used to
 631  * find a way to print an event. If the @event->type is set
 632  * then it will use that type, otherwise it will assign a
 633  * type to use.
 634  *
 635  * If you assign your own type, please make sure it is added
 636  * to the trace_type enum in trace.h, to avoid collisions
 637  * with the dynamic types.
 638  *
 639  * Returns the event type number or zero on error.
 640  */
 641 int register_ftrace_event(struct trace_event *event)
 642 {
 643         unsigned key;
 644         int ret = 0;
 645
 646         down_write(&trace_event_mutex);
 647
 648         if (WARN_ON(!event))
 649                 goto out;
 650
 651         INIT_LIST_HEAD(&event->list);
 652
 653         if (!event->type) {
 654                 struct list_head *list = NULL;
 655
 656                 if (next_event_type > FTRACE_MAX_EVENT) {
 657
 658                         event->type = trace_search_list(&list);
 659                         if (!event->type)
 660                                 goto out;
 661
 662                 } else {
 663
 664                         event->type = next_event_type++;
 665                         list = &ftrace_event_list;
 666                 }
 667
 668                 if (WARN_ON(ftrace_find_event(event->type)))
 669                         goto out;
 670
 671                 list_add_tail(&event->list, list);
 672
 673         } else if (event->type > __TRACE_LAST_TYPE) {
 674                 printk(KERN_WARNING "Need to add type to trace.h\n");
 675                 WARN_ON(1);
 676                 goto out;
 677         } else {
 678                 /* Is this event already used */
 679                 if (ftrace_find_event(event->type))
 680                         goto out;
 681         }
 682
 683         if (event->trace == NULL)
 684                 event->trace = trace_nop_print;
 685         if (event->raw == NULL)
 686                 event->raw = trace_nop_print;
 687         if (event->hex == NULL)
 688                 event->hex = trace_nop_print;
 689         if (event->binary == NULL)
 690                 event->binary = trace_nop_print;
 691
 692         key = event->type & (EVENT_HASHSIZE - 1);
 693
 694         hlist_add_head(&event->node, &event_hash[key]);
 695
 696         ret = event->type;
 697  out:
 698         up_write(&trace_event_mutex);
 699
 700         return ret;
 701 }
 702 EXPORT_SYMBOL_GPL(register_ftrace_event);
 703
 704 /*
 705  * Used by module code with the trace_event_mutex held for write.
 706  */
 707 int __unregister_ftrace_event(struct trace_event *event)
 708 {
 709         hlist_del(&event->node);
 710         list_del(&event->list);
 711         return 0;
 712 }
 713
 714 /**
 715  * unregister_ftrace_event - remove a no longer used event
 716  * @event: the event to remove
 717  */
 718 int unregister_ftrace_event(struct trace_event *event)
 719 {
 720         down_write(&trace_event_mutex);
 721         __unregister_ftrace_event(event);
 722         up_write(&trace_event_mutex);
 723
 724         return 0;
 725 }
 726 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 727
 728 /*
 729  * Standard events
 730  */
 731
 732 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 733 {
 734         return TRACE_TYPE_HANDLED;
 735 }
 736
 737 /* TRACE_FN */
 738 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 739 {
 740         struct ftrace_entry *field;
 741         struct trace_seq *s = &iter->seq;
 742
 743         trace_assign_type(field, iter->ent);
 744
 745         if (!seq_print_ip_sym(s, field->ip, flags))
 746                 goto partial;
 747
 748         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 749                 if (!trace_seq_printf(s, " <-"))
 750                         goto partial;
 751                 if (!seq_print_ip_sym(s,
 752                                       field->parent_ip,
 753                                       flags))
 754                         goto partial;
 755         }
 756         if (!trace_seq_printf(s, "\n"))
 757                 goto partial;
 758
 759         return TRACE_TYPE_HANDLED;
 760
 761  partial:
 762         return TRACE_TYPE_PARTIAL_LINE;
 763 }
 764
 765 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 766 {
 767         struct ftrace_entry *field;
 768
 769         trace_assign_type(field, iter->ent);
 770
 771         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 772                               field->ip,
 773                               field->parent_ip))
 774                 return TRACE_TYPE_PARTIAL_LINE;
 775
 776         return TRACE_TYPE_HANDLED;
 777 }
 778
 779 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 780 {
 781         struct ftrace_entry *field;
 782         struct trace_seq *s = &iter->seq;
 783
 784         trace_assign_type(field, iter->ent);
 785
 786         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 787         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 788
 789         return TRACE_TYPE_HANDLED;
 790 }
 791
 792 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 793 {
 794         struct ftrace_entry *field;
 795         struct trace_seq *s = &iter->seq;
 796
 797         trace_assign_type(field, iter->ent);
 798
 799         SEQ_PUT_FIELD_RET(s, field->ip);
 800         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 801
 802         return TRACE_TYPE_HANDLED;
 803 }
 804
 805 static struct trace_event trace_fn_event = {
 806         .type           = TRACE_FN,
 807         .trace          = trace_fn_trace,
 808         .raw            = trace_fn_raw,
 809         .hex            = trace_fn_hex,
 810         .binary         = trace_fn_bin,
 811 };
 812
 813 /* TRACE_CTX an TRACE_WAKE */
 814 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 815                                              char *delim)
 816 {
 817         struct ctx_switch_entry *field;
 818         char comm[TASK_COMM_LEN];
 819         int S, T;
 820
 821
 822         trace_assign_type(field, iter->ent);
 823
 824         T = task_state_char(field->next_state);
 825         S = task_state_char(field->prev_state);
 826         trace_find_cmdline(field->next_pid, comm);
 827         if (!trace_seq_printf(&iter->seq,
 828                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 829                               field->prev_pid,
 830                               field->prev_prio,
 831                               S, delim,
 832                               field->next_cpu,
 833                               field->next_pid,
 834                               field->next_prio,
 835                               T, comm))
 836                 return TRACE_TYPE_PARTIAL_LINE;
 837
 838         return TRACE_TYPE_HANDLED;
 839 }
 840
 841 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 842 {
 843         return trace_ctxwake_print(iter, "==>");
 844 }
 845
 846 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 847                                           int flags)
 848 {
 849         return trace_ctxwake_print(iter, "  +");
 850 }
 851
 852 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 853 {
 854         struct ctx_switch_entry *field;
 855         int T;
 856
 857         trace_assign_type(field, iter->ent);
 858
 859         if (!S)
 860                 task_state_char(field->prev_state);
 861         T = task_state_char(field->next_state);
 862         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 863                               field->prev_pid,
 864                               field->prev_prio,
 865                               S,
 866                               field->next_cpu,
 867                               field->next_pid,
 868                               field->next_prio,
 869                               T))
 870                 return TRACE_TYPE_PARTIAL_LINE;
 871
 872         return TRACE_TYPE_HANDLED;
 873 }
 874
 875 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 876 {
 877         return trace_ctxwake_raw(iter, 0);
 878 }
 879
 880 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 881 {
 882         return trace_ctxwake_raw(iter, '+');
 883 }
 884
 885
 886 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 887 {
 888         struct ctx_switch_entry *field;
 889         struct trace_seq *s = &iter->seq;
 890         int T;
 891
 892         trace_assign_type(field, iter->ent);
 893
 894         if (!S)
 895                 task_state_char(field->prev_state);
 896         T = task_state_char(field->next_state);
 897
 898         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 899         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 900         SEQ_PUT_HEX_FIELD_RET(s, S);
 901         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 902         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 903         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 904         SEQ_PUT_HEX_FIELD_RET(s, T);
 905
 906         return TRACE_TYPE_HANDLED;
 907 }
 908
 909 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 910 {
 911         return trace_ctxwake_hex(iter, 0);
 912 }
 913
 914 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 915 {
 916         return trace_ctxwake_hex(iter, '+');
 917 }
 918
 919 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 920                                            int flags)
 921 {
 922         struct ctx_switch_entry *field;
 923         struct trace_seq *s = &iter->seq;
 924
 925         trace_assign_type(field, iter->ent);
 926
 927         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 928         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 929         SEQ_PUT_FIELD_RET(s, field->prev_state);
 930         SEQ_PUT_FIELD_RET(s, field->next_pid);
 931         SEQ_PUT_FIELD_RET(s, field->next_prio);
 932         SEQ_PUT_FIELD_RET(s, field->next_state);
 933
 934         return TRACE_TYPE_HANDLED;
 935 }
 936
 937 static struct trace_event trace_ctx_event = {
 938         .type           = TRACE_CTX,
 939         .trace          = trace_ctx_print,
 940         .raw            = trace_ctx_raw,
 941         .hex            = trace_ctx_hex,
 942         .binary         = trace_ctxwake_bin,
 943 };
 944
 945 static struct trace_event trace_wake_event = {
 946         .type           = TRACE_WAKE,
 947         .trace          = trace_wake_print,
 948         .raw            = trace_wake_raw,
 949         .hex            = trace_wake_hex,
 950         .binary         = trace_ctxwake_bin,
 951 };
 952
 953 /* TRACE_SPECIAL */
 954 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 955                                              int flags)
 956 {
 957         struct special_entry *field;
 958
 959         trace_assign_type(field, iter->ent);
 960
 961         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 962                               field->arg1,
 963                               field->arg2,
 964                               field->arg3))
 965                 return TRACE_TYPE_PARTIAL_LINE;
 966
 967         return TRACE_TYPE_HANDLED;
 968 }
 969
 970 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 971                                            int flags)
 972 {
 973         struct special_entry *field;
 974         struct trace_seq *s = &iter->seq;
 975
 976         trace_assign_type(field, iter->ent);
 977
 978         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 979         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 980         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 981
 982         return TRACE_TYPE_HANDLED;
 983 }
 984
 985 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 986                                            int flags)
 987 {
 988         struct special_entry *field;
 989         struct trace_seq *s = &iter->seq;
 990
 991         trace_assign_type(field, iter->ent);
 992
 993         SEQ_PUT_FIELD_RET(s, field->arg1);
 994         SEQ_PUT_FIELD_RET(s, field->arg2);
 995         SEQ_PUT_FIELD_RET(s, field->arg3);
 996
 997         return TRACE_TYPE_HANDLED;
 998 }
 999
1000 static struct trace_event trace_special_event = {
1001         .type           = TRACE_SPECIAL,
1002         .trace          = trace_special_print,
1003         .raw            = trace_special_print,
1004         .hex            = trace_special_hex,
1005         .binary         = trace_special_bin,
1006 };
1007
1008 /* TRACE_STACK */
1009
1010 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1011                                            int flags)
1012 {
1013         struct stack_entry *field;
1014         struct trace_seq *s = &iter->seq;
1015         int i;
1016
1017         trace_assign_type(field, iter->ent);
1018
1019         if (!trace_seq_puts(s, "<stack trace>\n"))
1020                 goto partial;
1021         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1022                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1023                         break;
1024                 if (!trace_seq_puts(s, " => "))
1025                         goto partial;
1026
1027                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1028                         goto partial;
1029                 if (!trace_seq_puts(s, "\n"))
1030                         goto partial;
1031         }
1032
1033         return TRACE_TYPE_HANDLED;
1034
1035  partial:
1036         return TRACE_TYPE_PARTIAL_LINE;
1037 }
1038
1039 static struct trace_event trace_stack_event = {
1040         .type           = TRACE_STACK,
1041         .trace          = trace_stack_print,
1042         .raw            = trace_special_print,
1043         .hex            = trace_special_hex,
1044         .binary         = trace_special_bin,
1045 };
1046
1047 /* TRACE_USER_STACK */
1048 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1049                                                 int flags)
1050 {
1051         struct userstack_entry *field;
1052         struct trace_seq *s = &iter->seq;
1053
1054         trace_assign_type(field, iter->ent);
1055
1056         if (!trace_seq_puts(s, "<user stack trace>\n"))
1057                 goto partial;
1058
1059         if (!seq_print_userip_objs(field, s, flags))
1060                 goto partial;
1061
1062         return TRACE_TYPE_HANDLED;
1063
1064  partial:
1065         return TRACE_TYPE_PARTIAL_LINE;
1066 }
1067
1068 static struct trace_event trace_user_stack_event = {
1069         .type           = TRACE_USER_STACK,
1070         .trace          = trace_user_stack_print,
1071         .raw            = trace_special_print,
1072         .hex            = trace_special_hex,
1073         .binary         = trace_special_bin,
1074 };
1075
1076 /* TRACE_BPRINT */
1077 static enum print_line_t
1078 trace_bprint_print(struct trace_iterator *iter, int flags)
1079 {
1080         struct trace_entry *entry = iter->ent;
1081         struct trace_seq *s = &iter->seq;
1082         struct bprint_entry *field;
1083
1084         trace_assign_type(field, entry);
1085
1086         if (!seq_print_ip_sym(s, field->ip, flags))
1087                 goto partial;
1088
1089         if (!trace_seq_puts(s, ": "))
1090                 goto partial;
1091
1092         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1093                 goto partial;
1094
1095         return TRACE_TYPE_HANDLED;
1096
1097  partial:
1098         return TRACE_TYPE_PARTIAL_LINE;
1099 }
1100
1101
1102 static enum print_line_t
1103 trace_bprint_raw(struct trace_iterator *iter, int flags)
1104 {
1105         struct bprint_entry *field;
1106         struct trace_seq *s = &iter->seq;
1107
1108         trace_assign_type(field, iter->ent);
1109
1110         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1111                 goto partial;
1112
1113         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1114                 goto partial;
1115
1116         return TRACE_TYPE_HANDLED;
1117
1118  partial:
1119         return TRACE_TYPE_PARTIAL_LINE;
1120 }
1121
1122
1123 static struct trace_event trace_bprint_event = {
1124         .type           = TRACE_BPRINT,
1125         .trace          = trace_bprint_print,
1126         .raw            = trace_bprint_raw,
1127 };
1128
1129 /* TRACE_PRINT */
1130 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1131                                            int flags)
1132 {
1133         struct print_entry *field;
1134         struct trace_seq *s = &iter->seq;
1135
1136         trace_assign_type(field, iter->ent);
1137
1138         if (!seq_print_ip_sym(s, field->ip, flags))
1139                 goto partial;
1140
1141         if (!trace_seq_printf(s, ": %s", field->buf))
1142                 goto partial;
1143
1144         return TRACE_TYPE_HANDLED;
1145
1146  partial:
1147         return TRACE_TYPE_PARTIAL_LINE;
1148 }
1149
1150 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1151 {
1152         struct print_entry *field;
1153
1154         trace_assign_type(field, iter->ent);
1155
1156         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1157                 goto partial;
1158
1159         return TRACE_TYPE_HANDLED;
1160
1161  partial:
1162         return TRACE_TYPE_PARTIAL_LINE;
1163 }
1164
1165 static struct trace_event trace_print_event = {
1166         .type           = TRACE_PRINT,
1167         .trace          = trace_print_print,
1168         .raw            = trace_print_raw,
1169 };
1170
1171
1172 static struct trace_event *events[] __initdata = {
1173         &trace_fn_event,
1174         &trace_ctx_event,
1175         &trace_wake_event,
1176         &trace_special_event,
1177         &trace_stack_event,
1178         &trace_user_stack_event,
1179         &trace_bprint_event,
1180         &trace_print_event,
1181         NULL
1182 };
1183
1184 __init static int init_events(void)
1185 {
1186         struct trace_event *event;
1187         int i, ret;
1188
1189         for (i = 0; events[i]; i++) {
1190                 event = events[i];
1191
1192                 ret = register_ftrace_event(event);
1193                 if (!ret) {
1194                         printk(KERN_WARNING "event %d failed to register\n",
1195                                event->type);
1196                         WARN_ON_ONCE(1);
1197                 }
1198         }
1199
1200         return 0;
1201 }
1202 device_initcall(init_events);