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