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   1 /*
   2  * trace_output.c
   3  *
   4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11
  12 #include "trace_output.h"
  13
  14 /* must be a power of 2 */
  15 #define EVENT_HASHSIZE  128
  16
  17 static DEFINE_MUTEX(trace_event_mutex);
  18 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  19
  20 static int next_event_type = __TRACE_LAST_TYPE + 1;
  21
  22 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 static LIST_HEAD(ftrace_event_list);
 487
 488 static int trace_search_list(struct list_head **list)
 489 {
 490         struct trace_event *e;
 491         int last = __TRACE_LAST_TYPE;
 492
 493         if (list_empty(&ftrace_event_list)) {
 494                 *list = &ftrace_event_list;
 495                 return last + 1;
 496         }
 497
 498         /*
 499          * We used up all possible max events,
 500          * lets see if somebody freed one.
 501          */
 502         list_for_each_entry(e, &ftrace_event_list, list) {
 503                 if (e->type != last + 1)
 504                         break;
 505                 last++;
 506         }
 507
 508         /* Did we used up all 65 thousand events??? */
 509         if ((last + 1) > FTRACE_MAX_EVENT)
 510                 return 0;
 511
 512         *list = &e->list;
 513         return last + 1;
 514 }
 515
 516 /**
 517  * register_ftrace_event - register output for an event type
 518  * @event: the event type to register
 519  *
 520  * Event types are stored in a hash and this hash is used to
 521  * find a way to print an event. If the @event->type is set
 522  * then it will use that type, otherwise it will assign a
 523  * type to use.
 524  *
 525  * If you assign your own type, please make sure it is added
 526  * to the trace_type enum in trace.h, to avoid collisions
 527  * with the dynamic types.
 528  *
 529  * Returns the event type number or zero on error.
 530  */
 531 int register_ftrace_event(struct trace_event *event)
 532 {
 533         unsigned key;
 534         int ret = 0;
 535
 536         mutex_lock(&trace_event_mutex);
 537
 538         if (WARN_ON(!event))
 539                 goto out;
 540
 541         INIT_LIST_HEAD(&event->list);
 542
 543         if (!event->type) {
 544                 struct list_head *list = NULL;
 545
 546                 if (next_event_type > FTRACE_MAX_EVENT) {
 547
 548                         event->type = trace_search_list(&list);
 549                         if (!event->type)
 550                                 goto out;
 551
 552                 } else {
 553
 554                         event->type = next_event_type++;
 555                         list = &ftrace_event_list;
 556                 }
 557
 558                 if (WARN_ON(ftrace_find_event(event->type)))
 559                         goto out;
 560
 561                 list_add_tail(&event->list, list);
 562
 563         } else if (event->type > __TRACE_LAST_TYPE) {
 564                 printk(KERN_WARNING "Need to add type to trace.h\n");
 565                 WARN_ON(1);
 566                 goto out;
 567         } else {
 568                 /* Is this event already used */
 569                 if (ftrace_find_event(event->type))
 570                         goto out;
 571         }
 572
 573         if (event->trace == NULL)
 574                 event->trace = trace_nop_print;
 575         if (event->raw == NULL)
 576                 event->raw = trace_nop_print;
 577         if (event->hex == NULL)
 578                 event->hex = trace_nop_print;
 579         if (event->binary == NULL)
 580                 event->binary = trace_nop_print;
 581
 582         key = event->type & (EVENT_HASHSIZE - 1);
 583
 584         hlist_add_head_rcu(&event->node, &event_hash[key]);
 585
 586         ret = event->type;
 587  out:
 588         mutex_unlock(&trace_event_mutex);
 589
 590         return ret;
 591 }
 592 EXPORT_SYMBOL_GPL(register_ftrace_event);
 593
 594 /**
 595  * unregister_ftrace_event - remove a no longer used event
 596  * @event: the event to remove
 597  */
 598 int unregister_ftrace_event(struct trace_event *event)
 599 {
 600         mutex_lock(&trace_event_mutex);
 601         hlist_del(&event->node);
 602         list_del(&event->list);
 603         mutex_unlock(&trace_event_mutex);
 604
 605         return 0;
 606 }
 607 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 608
 609 /*
 610  * Standard events
 611  */
 612
 613 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 614 {
 615         return TRACE_TYPE_HANDLED;
 616 }
 617
 618 /* TRACE_FN */
 619 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 620 {
 621         struct ftrace_entry *field;
 622         struct trace_seq *s = &iter->seq;
 623
 624         trace_assign_type(field, iter->ent);
 625
 626         if (!seq_print_ip_sym(s, field->ip, flags))
 627                 goto partial;
 628
 629         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 630                 if (!trace_seq_printf(s, " <-"))
 631                         goto partial;
 632                 if (!seq_print_ip_sym(s,
 633                                       field->parent_ip,
 634                                       flags))
 635                         goto partial;
 636         }
 637         if (!trace_seq_printf(s, "\n"))
 638                 goto partial;
 639
 640         return TRACE_TYPE_HANDLED;
 641
 642  partial:
 643         return TRACE_TYPE_PARTIAL_LINE;
 644 }
 645
 646 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 647 {
 648         struct ftrace_entry *field;
 649
 650         trace_assign_type(field, iter->ent);
 651
 652         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 653                               field->ip,
 654                               field->parent_ip))
 655                 return TRACE_TYPE_PARTIAL_LINE;
 656
 657         return TRACE_TYPE_HANDLED;
 658 }
 659
 660 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 661 {
 662         struct ftrace_entry *field;
 663         struct trace_seq *s = &iter->seq;
 664
 665         trace_assign_type(field, iter->ent);
 666
 667         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 668         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 669
 670         return TRACE_TYPE_HANDLED;
 671 }
 672
 673 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 674 {
 675         struct ftrace_entry *field;
 676         struct trace_seq *s = &iter->seq;
 677
 678         trace_assign_type(field, iter->ent);
 679
 680         SEQ_PUT_FIELD_RET(s, field->ip);
 681         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 682
 683         return TRACE_TYPE_HANDLED;
 684 }
 685
 686 static struct trace_event trace_fn_event = {
 687         .type           = TRACE_FN,
 688         .trace          = trace_fn_trace,
 689         .raw            = trace_fn_raw,
 690         .hex            = trace_fn_hex,
 691         .binary         = trace_fn_bin,
 692 };
 693
 694 /* TRACE_CTX an TRACE_WAKE */
 695 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 696                                              char *delim)
 697 {
 698         struct ctx_switch_entry *field;
 699         char comm[TASK_COMM_LEN];
 700         int S, T;
 701
 702
 703         trace_assign_type(field, iter->ent);
 704
 705         T = task_state_char(field->next_state);
 706         S = task_state_char(field->prev_state);
 707         trace_find_cmdline(field->next_pid, comm);
 708         if (!trace_seq_printf(&iter->seq,
 709                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 710                               field->prev_pid,
 711                               field->prev_prio,
 712                               S, delim,
 713                               field->next_cpu,
 714                               field->next_pid,
 715                               field->next_prio,
 716                               T, comm))
 717                 return TRACE_TYPE_PARTIAL_LINE;
 718
 719         return TRACE_TYPE_HANDLED;
 720 }
 721
 722 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 723 {
 724         return trace_ctxwake_print(iter, "==>");
 725 }
 726
 727 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 728                                           int flags)
 729 {
 730         return trace_ctxwake_print(iter, "  +");
 731 }
 732
 733 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 734 {
 735         struct ctx_switch_entry *field;
 736         int T;
 737
 738         trace_assign_type(field, iter->ent);
 739
 740         if (!S)
 741                 task_state_char(field->prev_state);
 742         T = task_state_char(field->next_state);
 743         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 744                               field->prev_pid,
 745                               field->prev_prio,
 746                               S,
 747                               field->next_cpu,
 748                               field->next_pid,
 749                               field->next_prio,
 750                               T))
 751                 return TRACE_TYPE_PARTIAL_LINE;
 752
 753         return TRACE_TYPE_HANDLED;
 754 }
 755
 756 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 757 {
 758         return trace_ctxwake_raw(iter, 0);
 759 }
 760
 761 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 762 {
 763         return trace_ctxwake_raw(iter, '+');
 764 }
 765
 766
 767 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 768 {
 769         struct ctx_switch_entry *field;
 770         struct trace_seq *s = &iter->seq;
 771         int T;
 772
 773         trace_assign_type(field, iter->ent);
 774
 775         if (!S)
 776                 task_state_char(field->prev_state);
 777         T = task_state_char(field->next_state);
 778
 779         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 780         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 781         SEQ_PUT_HEX_FIELD_RET(s, S);
 782         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 783         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 784         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 785         SEQ_PUT_HEX_FIELD_RET(s, T);
 786
 787         return TRACE_TYPE_HANDLED;
 788 }
 789
 790 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 791 {
 792         return trace_ctxwake_hex(iter, 0);
 793 }
 794
 795 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 796 {
 797         return trace_ctxwake_hex(iter, '+');
 798 }
 799
 800 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 801                                            int flags)
 802 {
 803         struct ctx_switch_entry *field;
 804         struct trace_seq *s = &iter->seq;
 805
 806         trace_assign_type(field, iter->ent);
 807
 808         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 809         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 810         SEQ_PUT_FIELD_RET(s, field->prev_state);
 811         SEQ_PUT_FIELD_RET(s, field->next_pid);
 812         SEQ_PUT_FIELD_RET(s, field->next_prio);
 813         SEQ_PUT_FIELD_RET(s, field->next_state);
 814
 815         return TRACE_TYPE_HANDLED;
 816 }
 817
 818 static struct trace_event trace_ctx_event = {
 819         .type           = TRACE_CTX,
 820         .trace          = trace_ctx_print,
 821         .raw            = trace_ctx_raw,
 822         .hex            = trace_ctx_hex,
 823         .binary         = trace_ctxwake_bin,
 824 };
 825
 826 static struct trace_event trace_wake_event = {
 827         .type           = TRACE_WAKE,
 828         .trace          = trace_wake_print,
 829         .raw            = trace_wake_raw,
 830         .hex            = trace_wake_hex,
 831         .binary         = trace_ctxwake_bin,
 832 };
 833
 834 /* TRACE_SPECIAL */
 835 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 836                                              int flags)
 837 {
 838         struct special_entry *field;
 839
 840         trace_assign_type(field, iter->ent);
 841
 842         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 843                               field->arg1,
 844                               field->arg2,
 845                               field->arg3))
 846                 return TRACE_TYPE_PARTIAL_LINE;
 847
 848         return TRACE_TYPE_HANDLED;
 849 }
 850
 851 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 852                                            int flags)
 853 {
 854         struct special_entry *field;
 855         struct trace_seq *s = &iter->seq;
 856
 857         trace_assign_type(field, iter->ent);
 858
 859         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 860         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 861         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 862
 863         return TRACE_TYPE_HANDLED;
 864 }
 865
 866 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 867                                            int flags)
 868 {
 869         struct special_entry *field;
 870         struct trace_seq *s = &iter->seq;
 871
 872         trace_assign_type(field, iter->ent);
 873
 874         SEQ_PUT_FIELD_RET(s, field->arg1);
 875         SEQ_PUT_FIELD_RET(s, field->arg2);
 876         SEQ_PUT_FIELD_RET(s, field->arg3);
 877
 878         return TRACE_TYPE_HANDLED;
 879 }
 880
 881 static struct trace_event trace_special_event = {
 882         .type           = TRACE_SPECIAL,
 883         .trace          = trace_special_print,
 884         .raw            = trace_special_print,
 885         .hex            = trace_special_hex,
 886         .binary         = trace_special_bin,
 887 };
 888
 889 /* TRACE_STACK */
 890
 891 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 892                                            int flags)
 893 {
 894         struct stack_entry *field;
 895         struct trace_seq *s = &iter->seq;
 896         int i;
 897
 898         trace_assign_type(field, iter->ent);
 899
 900         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 901                 if (!field->caller[i])
 902                         break;
 903                 if (i) {
 904                         if (!trace_seq_puts(s, " <= "))
 905                                 goto partial;
 906
 907                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 908                                 goto partial;
 909                 }
 910                 if (!trace_seq_puts(s, "\n"))
 911                         goto partial;
 912         }
 913
 914         return TRACE_TYPE_HANDLED;
 915
 916  partial:
 917         return TRACE_TYPE_PARTIAL_LINE;
 918 }
 919
 920 static struct trace_event trace_stack_event = {
 921         .type           = TRACE_STACK,
 922         .trace          = trace_stack_print,
 923         .raw            = trace_special_print,
 924         .hex            = trace_special_hex,
 925         .binary         = trace_special_bin,
 926 };
 927
 928 /* TRACE_USER_STACK */
 929 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 930                                                 int flags)
 931 {
 932         struct userstack_entry *field;
 933         struct trace_seq *s = &iter->seq;
 934
 935         trace_assign_type(field, iter->ent);
 936
 937         if (!seq_print_userip_objs(field, s, flags))
 938                 goto partial;
 939
 940         if (!trace_seq_putc(s, '\n'))
 941                 goto partial;
 942
 943         return TRACE_TYPE_HANDLED;
 944
 945  partial:
 946         return TRACE_TYPE_PARTIAL_LINE;
 947 }
 948
 949 static struct trace_event trace_user_stack_event = {
 950         .type           = TRACE_USER_STACK,
 951         .trace          = trace_user_stack_print,
 952         .raw            = trace_special_print,
 953         .hex            = trace_special_hex,
 954         .binary         = trace_special_bin,
 955 };
 956
 957 /* TRACE_BPRINT */
 958 static enum print_line_t
 959 trace_bprint_print(struct trace_iterator *iter, int flags)
 960 {
 961         struct trace_entry *entry = iter->ent;
 962         struct trace_seq *s = &iter->seq;
 963         struct bprint_entry *field;
 964
 965         trace_assign_type(field, entry);
 966
 967         if (!seq_print_ip_sym(s, field->ip, flags))
 968                 goto partial;
 969
 970         if (!trace_seq_puts(s, ": "))
 971                 goto partial;
 972
 973         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 974                 goto partial;
 975
 976         return TRACE_TYPE_HANDLED;
 977
 978  partial:
 979         return TRACE_TYPE_PARTIAL_LINE;
 980 }
 981
 982
 983 static enum print_line_t
 984 trace_bprint_raw(struct trace_iterator *iter, int flags)
 985 {
 986         struct bprint_entry *field;
 987         struct trace_seq *s = &iter->seq;
 988
 989         trace_assign_type(field, iter->ent);
 990
 991         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 992                 goto partial;
 993
 994         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 995                 goto partial;
 996
 997         return TRACE_TYPE_HANDLED;
 998
 999  partial:
1000         return TRACE_TYPE_PARTIAL_LINE;
1001 }
1002
1003
1004 static struct trace_event trace_bprint_event = {
1005         .type           = TRACE_BPRINT,
1006         .trace          = trace_bprint_print,
1007         .raw            = trace_bprint_raw,
1008 };
1009
1010 /* TRACE_PRINT */
1011 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1012                                            int flags)
1013 {
1014         struct print_entry *field;
1015         struct trace_seq *s = &iter->seq;
1016
1017         trace_assign_type(field, iter->ent);
1018
1019         if (!seq_print_ip_sym(s, field->ip, flags))
1020                 goto partial;
1021
1022         if (!trace_seq_printf(s, ": %s", field->buf))
1023                 goto partial;
1024
1025         return TRACE_TYPE_HANDLED;
1026
1027  partial:
1028         return TRACE_TYPE_PARTIAL_LINE;
1029 }
1030
1031 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1032 {
1033         struct print_entry *field;
1034
1035         trace_assign_type(field, iter->ent);
1036
1037         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1038                 goto partial;
1039
1040         return TRACE_TYPE_HANDLED;
1041
1042  partial:
1043         return TRACE_TYPE_PARTIAL_LINE;
1044 }
1045
1046 static struct trace_event trace_print_event = {
1047         .type           = TRACE_PRINT,
1048         .trace          = trace_print_print,
1049         .raw            = trace_print_raw,
1050 };
1051
1052
1053 static struct trace_event *events[] __initdata = {
1054         &trace_fn_event,
1055         &trace_ctx_event,
1056         &trace_wake_event,
1057         &trace_special_event,
1058         &trace_stack_event,
1059         &trace_user_stack_event,
1060         &trace_bprint_event,
1061         &trace_print_event,
1062         NULL
1063 };
1064
1065 __init static int init_events(void)
1066 {
1067         struct trace_event *event;
1068         int i, ret;
1069
1070         for (i = 0; events[i]; i++) {
1071                 event = events[i];
1072
1073                 ret = register_ftrace_event(event);
1074                 if (!ret) {
1075                         printk(KERN_WARNING "event %d failed to register\n",
1076                                event->type);
1077                         WARN_ON_ONCE(1);
1078                 }
1079         }
1080
1081         return 0;
1082 }
1083 device_initcall(init_events);