kernel/trace/trace_output.c

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