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 int
 290 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 291 {
 292         int hardirq, softirq;
 293         char *comm;
 294
 295         comm = trace_find_cmdline(entry->pid);
 296         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 297         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 298
 299         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 300                               comm, entry->pid, cpu,
 301                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 302                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 303                                   'X' : '.',
 304                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 305                                 'N' : '.',
 306                               (hardirq && softirq) ? 'H' :
 307                                 hardirq ? 'h' : softirq ? 's' : '.'))
 308                 return 0;
 309
 310         if (entry->preempt_count)
 311                 return trace_seq_printf(s, "%x", entry->preempt_count);
 312         return trace_seq_puts(s, ".");
 313 }
 314
 315 static unsigned long preempt_mark_thresh = 100;
 316
 317 static int
 318 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 319                     unsigned long rel_usecs)
 320 {
 321         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 322                                 rel_usecs > preempt_mark_thresh ? '!' :
 323                                   rel_usecs > 1 ? '+' : ' ');
 324 }
 325
 326 int trace_print_context(struct trace_iterator *iter)
 327 {
 328         struct trace_seq *s = &iter->seq;
 329         struct trace_entry *entry = iter->ent;
 330         char *comm = trace_find_cmdline(entry->pid);
 331         unsigned long long t = ns2usecs(iter->ts);
 332         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 333         unsigned long secs = (unsigned long)t;
 334
 335         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 336                                 comm, entry->pid, entry->cpu, secs, usec_rem);
 337 }
 338
 339 int trace_print_lat_context(struct trace_iterator *iter)
 340 {
 341         u64 next_ts;
 342         int ret;
 343         struct trace_seq *s = &iter->seq;
 344         struct trace_entry *entry = iter->ent,
 345                            *next_entry = trace_find_next_entry(iter, NULL,
 346                                                                &next_ts);
 347         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 348         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 349         unsigned long rel_usecs;
 350
 351         if (!next_entry)
 352                 next_ts = iter->ts;
 353         rel_usecs = ns2usecs(next_ts - iter->ts);
 354
 355         if (verbose) {
 356                 char *comm = trace_find_cmdline(entry->pid);
 357                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 358                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 359                                        entry->pid, entry->cpu, entry->flags,
 360                                        entry->preempt_count, iter->idx,
 361                                        ns2usecs(iter->ts),
 362                                        abs_usecs / USEC_PER_MSEC,
 363                                        abs_usecs % USEC_PER_MSEC,
 364                                        rel_usecs / USEC_PER_MSEC,
 365                                        rel_usecs % USEC_PER_MSEC);
 366         } else {
 367                 ret = lat_print_generic(s, entry, entry->cpu);
 368                 if (ret)
 369                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 370         }
 371
 372         return ret;
 373 }
 374
 375 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 376
 377 static int task_state_char(unsigned long state)
 378 {
 379         int bit = state ? __ffs(state) + 1 : 0;
 380
 381         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 382 }
 383
 384 /**
 385  * ftrace_find_event - find a registered event
 386  * @type: the type of event to look for
 387  *
 388  * Returns an event of type @type otherwise NULL
 389  */
 390 struct trace_event *ftrace_find_event(int type)
 391 {
 392         struct trace_event *event;
 393         struct hlist_node *n;
 394         unsigned key;
 395
 396         key = type & (EVENT_HASHSIZE - 1);
 397
 398         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 399                 if (event->type == type)
 400                         return event;
 401         }
 402
 403         return NULL;
 404 }
 405
 406 /**
 407  * register_ftrace_event - register output for an event type
 408  * @event: the event type to register
 409  *
 410  * Event types are stored in a hash and this hash is used to
 411  * find a way to print an event. If the @event->type is set
 412  * then it will use that type, otherwise it will assign a
 413  * type to use.
 414  *
 415  * If you assign your own type, please make sure it is added
 416  * to the trace_type enum in trace.h, to avoid collisions
 417  * with the dynamic types.
 418  *
 419  * Returns the event type number or zero on error.
 420  */
 421 int register_ftrace_event(struct trace_event *event)
 422 {
 423         unsigned key;
 424         int ret = 0;
 425
 426         mutex_lock(&trace_event_mutex);
 427
 428         if (!event->type)
 429                 event->type = next_event_type++;
 430         else if (event->type > __TRACE_LAST_TYPE) {
 431                 printk(KERN_WARNING "Need to add type to trace.h\n");
 432                 WARN_ON(1);
 433         }
 434
 435         if (ftrace_find_event(event->type))
 436                 goto out;
 437
 438         key = event->type & (EVENT_HASHSIZE - 1);
 439
 440         hlist_add_head_rcu(&event->node, &event_hash[key]);
 441
 442         ret = event->type;
 443  out:
 444         mutex_unlock(&trace_event_mutex);
 445
 446         return ret;
 447 }
 448
 449 /**
 450  * unregister_ftrace_event - remove a no longer used event
 451  * @event: the event to remove
 452  */
 453 int unregister_ftrace_event(struct trace_event *event)
 454 {
 455         mutex_lock(&trace_event_mutex);
 456         hlist_del(&event->node);
 457         mutex_unlock(&trace_event_mutex);
 458
 459         return 0;
 460 }
 461
 462 /*
 463  * Standard events
 464  */
 465
 466 int trace_nop_print(struct trace_iterator *iter, int flags)
 467 {
 468         return TRACE_TYPE_HANDLED;
 469 }
 470
 471 /* TRACE_FN */
 472 static int trace_fn_latency(struct trace_iterator *iter, int flags)
 473 {
 474         struct ftrace_entry *field;
 475         struct trace_seq *s = &iter->seq;
 476
 477         trace_assign_type(field, iter->ent);
 478
 479         if (!seq_print_ip_sym(s, field->ip, flags))
 480                 goto partial;
 481         if (!trace_seq_puts(s, " ("))
 482                 goto partial;
 483         if (!seq_print_ip_sym(s, field->parent_ip, flags))
 484                 goto partial;
 485         if (!trace_seq_puts(s, ")\n"))
 486                 goto partial;
 487
 488         return TRACE_TYPE_HANDLED;
 489
 490  partial:
 491         return TRACE_TYPE_PARTIAL_LINE;
 492 }
 493
 494 static int trace_fn_trace(struct trace_iterator *iter, int flags)
 495 {
 496         struct ftrace_entry *field;
 497         struct trace_seq *s = &iter->seq;
 498
 499         trace_assign_type(field, iter->ent);
 500
 501         if (!seq_print_ip_sym(s, field->ip, flags))
 502                 goto partial;
 503
 504         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 505                 if (!trace_seq_printf(s, " <-"))
 506                         goto partial;
 507                 if (!seq_print_ip_sym(s,
 508                                       field->parent_ip,
 509                                       flags))
 510                         goto partial;
 511         }
 512         if (!trace_seq_printf(s, "\n"))
 513                 goto partial;
 514
 515         return TRACE_TYPE_HANDLED;
 516
 517  partial:
 518         return TRACE_TYPE_PARTIAL_LINE;
 519 }
 520
 521 static int trace_fn_raw(struct trace_iterator *iter, int flags)
 522 {
 523         struct ftrace_entry *field;
 524
 525         trace_assign_type(field, iter->ent);
 526
 527         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 528                               field->ip,
 529                               field->parent_ip))
 530                 return TRACE_TYPE_PARTIAL_LINE;
 531
 532         return TRACE_TYPE_HANDLED;
 533 }
 534
 535 static int trace_fn_hex(struct trace_iterator *iter, int flags)
 536 {
 537         struct ftrace_entry *field;
 538         struct trace_seq *s = &iter->seq;
 539
 540         trace_assign_type(field, iter->ent);
 541
 542         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 543         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 544
 545         return TRACE_TYPE_HANDLED;
 546 }
 547
 548 static int trace_fn_bin(struct trace_iterator *iter, int flags)
 549 {
 550         struct ftrace_entry *field;
 551         struct trace_seq *s = &iter->seq;
 552
 553         trace_assign_type(field, iter->ent);
 554
 555         SEQ_PUT_FIELD_RET(s, field->ip);
 556         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 557
 558         return TRACE_TYPE_HANDLED;
 559 }
 560
 561 static struct trace_event trace_fn_event = {
 562         .type           = TRACE_FN,
 563         .trace          = trace_fn_trace,
 564         .latency_trace  = trace_fn_latency,
 565         .raw            = trace_fn_raw,
 566         .hex            = trace_fn_hex,
 567         .binary         = trace_fn_bin,
 568 };
 569
 570 /* TRACE_CTX an TRACE_WAKE */
 571 static int trace_ctxwake_print(struct trace_iterator *iter, char *delim)
 572 {
 573         struct ctx_switch_entry *field;
 574         char *comm;
 575         int S, T;
 576
 577         trace_assign_type(field, iter->ent);
 578
 579         T = task_state_char(field->next_state);
 580         S = task_state_char(field->prev_state);
 581         comm = trace_find_cmdline(field->next_pid);
 582         if (!trace_seq_printf(&iter->seq,
 583                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 584                               field->prev_pid,
 585                               field->prev_prio,
 586                               S, delim,
 587                               field->next_cpu,
 588                               field->next_pid,
 589                               field->next_prio,
 590                               T, comm))
 591                 return TRACE_TYPE_PARTIAL_LINE;
 592
 593         return TRACE_TYPE_HANDLED;
 594 }
 595
 596 static int trace_ctx_print(struct trace_iterator *iter, int flags)
 597 {
 598         return trace_ctxwake_print(iter, "==>");
 599 }
 600
 601 static int trace_wake_print(struct trace_iterator *iter, int flags)
 602 {
 603         return trace_ctxwake_print(iter, "  +");
 604 }
 605
 606 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 607 {
 608         struct ctx_switch_entry *field;
 609         int T;
 610
 611         trace_assign_type(field, iter->ent);
 612
 613         if (!S)
 614                 task_state_char(field->prev_state);
 615         T = task_state_char(field->next_state);
 616         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 617                               field->prev_pid,
 618                               field->prev_prio,
 619                               S,
 620                               field->next_cpu,
 621                               field->next_pid,
 622                               field->next_prio,
 623                               T))
 624                 return TRACE_TYPE_PARTIAL_LINE;
 625
 626         return TRACE_TYPE_HANDLED;
 627 }
 628
 629 static int trace_ctx_raw(struct trace_iterator *iter, int flags)
 630 {
 631         return trace_ctxwake_raw(iter, 0);
 632 }
 633
 634 static int trace_wake_raw(struct trace_iterator *iter, int flags)
 635 {
 636         return trace_ctxwake_raw(iter, '+');
 637 }
 638
 639
 640 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 641 {
 642         struct ctx_switch_entry *field;
 643         struct trace_seq *s = &iter->seq;
 644         int T;
 645
 646         trace_assign_type(field, iter->ent);
 647
 648         if (!S)
 649                 task_state_char(field->prev_state);
 650         T = task_state_char(field->next_state);
 651
 652         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 653         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 654         SEQ_PUT_HEX_FIELD_RET(s, S);
 655         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 656         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 657         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 658         SEQ_PUT_HEX_FIELD_RET(s, T);
 659
 660         return TRACE_TYPE_HANDLED;
 661 }
 662
 663 static int trace_ctx_hex(struct trace_iterator *iter, int flags)
 664 {
 665         return trace_ctxwake_hex(iter, 0);
 666 }
 667
 668 static int trace_wake_hex(struct trace_iterator *iter, int flags)
 669 {
 670         return trace_ctxwake_hex(iter, '+');
 671 }
 672
 673 static int trace_ctxwake_bin(struct trace_iterator *iter, int flags)
 674 {
 675         struct ctx_switch_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->prev_pid);
 681         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 682         SEQ_PUT_FIELD_RET(s, field->prev_state);
 683         SEQ_PUT_FIELD_RET(s, field->next_pid);
 684         SEQ_PUT_FIELD_RET(s, field->next_prio);
 685         SEQ_PUT_FIELD_RET(s, field->next_state);
 686
 687         return TRACE_TYPE_HANDLED;
 688 }
 689
 690 static struct trace_event trace_ctx_event = {
 691         .type           = TRACE_CTX,
 692         .trace          = trace_ctx_print,
 693         .latency_trace  = trace_ctx_print,
 694         .raw            = trace_ctx_raw,
 695         .hex            = trace_ctx_hex,
 696         .binary         = trace_ctxwake_bin,
 697 };
 698
 699 static struct trace_event trace_wake_event = {
 700         .type           = TRACE_WAKE,
 701         .trace          = trace_wake_print,
 702         .latency_trace  = trace_wake_print,
 703         .raw            = trace_wake_raw,
 704         .hex            = trace_wake_hex,
 705         .binary         = trace_ctxwake_bin,
 706 };
 707
 708 /* TRACE_SPECIAL */
 709 static int trace_special_print(struct trace_iterator *iter, int flags)
 710 {
 711         struct special_entry *field;
 712
 713         trace_assign_type(field, iter->ent);
 714
 715         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 716                               field->arg1,
 717                               field->arg2,
 718                               field->arg3))
 719                 return TRACE_TYPE_PARTIAL_LINE;
 720
 721         return TRACE_TYPE_HANDLED;
 722 }
 723
 724 static int trace_special_hex(struct trace_iterator *iter, int flags)
 725 {
 726         struct special_entry *field;
 727         struct trace_seq *s = &iter->seq;
 728
 729         trace_assign_type(field, iter->ent);
 730
 731         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 732         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 733         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 734
 735         return TRACE_TYPE_HANDLED;
 736 }
 737
 738 static int trace_special_bin(struct trace_iterator *iter, int flags)
 739 {
 740         struct special_entry *field;
 741         struct trace_seq *s = &iter->seq;
 742
 743         trace_assign_type(field, iter->ent);
 744
 745         SEQ_PUT_FIELD_RET(s, field->arg1);
 746         SEQ_PUT_FIELD_RET(s, field->arg2);
 747         SEQ_PUT_FIELD_RET(s, field->arg3);
 748
 749         return TRACE_TYPE_HANDLED;
 750 }
 751
 752 static struct trace_event trace_special_event = {
 753         .type           = TRACE_SPECIAL,
 754         .trace          = trace_special_print,
 755         .latency_trace  = trace_special_print,
 756         .raw            = trace_special_print,
 757         .hex            = trace_special_hex,
 758         .binary         = trace_special_bin,
 759 };
 760
 761 /* TRACE_STACK */
 762
 763 static int trace_stack_print(struct trace_iterator *iter, int flags)
 764 {
 765         struct stack_entry *field;
 766         struct trace_seq *s = &iter->seq;
 767         int i;
 768
 769         trace_assign_type(field, iter->ent);
 770
 771         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 772                 if (i) {
 773                         if (!trace_seq_puts(s, " <= "))
 774                                 goto partial;
 775
 776                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 777                                 goto partial;
 778                 }
 779                 if (!trace_seq_puts(s, "\n"))
 780                         goto partial;
 781         }
 782
 783         return TRACE_TYPE_HANDLED;
 784
 785  partial:
 786         return TRACE_TYPE_PARTIAL_LINE;
 787 }
 788
 789 static struct trace_event trace_stack_event = {
 790         .type           = TRACE_STACK,
 791         .trace          = trace_stack_print,
 792         .latency_trace  = trace_stack_print,
 793         .raw            = trace_special_print,
 794         .hex            = trace_special_hex,
 795         .binary         = trace_special_bin,
 796 };
 797
 798 /* TRACE_USER_STACK */
 799 static int trace_user_stack_print(struct trace_iterator *iter, int flags)
 800 {
 801         struct userstack_entry *field;
 802         struct trace_seq *s = &iter->seq;
 803
 804         trace_assign_type(field, iter->ent);
 805
 806         if (!seq_print_userip_objs(field, s, flags))
 807                 goto partial;
 808
 809         if (!trace_seq_putc(s, '\n'))
 810                 goto partial;
 811
 812         return TRACE_TYPE_HANDLED;
 813
 814  partial:
 815         return TRACE_TYPE_PARTIAL_LINE;
 816 }
 817
 818 static struct trace_event trace_user_stack_event = {
 819         .type           = TRACE_USER_STACK,
 820         .trace          = trace_user_stack_print,
 821         .latency_trace  = trace_user_stack_print,
 822         .raw            = trace_special_print,
 823         .hex            = trace_special_hex,
 824         .binary         = trace_special_bin,
 825 };
 826
 827 /* TRACE_PRINT */
 828 static int trace_print_print(struct trace_iterator *iter, int flags)
 829 {
 830         struct print_entry *field;
 831         struct trace_seq *s = &iter->seq;
 832
 833         trace_assign_type(field, iter->ent);
 834
 835         if (!seq_print_ip_sym(s, field->ip, flags))
 836                 goto partial;
 837
 838         if (!trace_seq_printf(s, ": %s", field->buf))
 839                 goto partial;
 840
 841         return TRACE_TYPE_HANDLED;
 842
 843  partial:
 844         return TRACE_TYPE_PARTIAL_LINE;
 845 }
 846
 847 static int trace_print_raw(struct trace_iterator *iter, int flags)
 848 {
 849         struct print_entry *field;
 850
 851         trace_assign_type(field, iter->ent);
 852
 853         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 854                 goto partial;
 855
 856         return TRACE_TYPE_HANDLED;
 857
 858  partial:
 859         return TRACE_TYPE_PARTIAL_LINE;
 860 }
 861
 862 static struct trace_event trace_print_event = {
 863         .type           = TRACE_PRINT,
 864         .trace          = trace_print_print,
 865         .latency_trace  = trace_print_print,
 866         .raw            = trace_print_raw,
 867         .hex            = trace_nop_print,
 868         .binary         = trace_nop_print,
 869 };
 870
 871 static struct trace_event *events[] __initdata = {
 872         &trace_fn_event,
 873         &trace_ctx_event,
 874         &trace_wake_event,
 875         &trace_special_event,
 876         &trace_stack_event,
 877         &trace_user_stack_event,
 878         &trace_print_event,
 879         NULL
 880 };
 881
 882 __init static int init_events(void)
 883 {
 884         struct trace_event *event;
 885         int i, ret;
 886
 887         for (i = 0; events[i]; i++) {
 888                 event = events[i];
 889
 890                 ret = register_ftrace_event(event);
 891                 if (!ret) {
 892                         printk(KERN_WARNING "event %d failed to register\n",
 893                                event->type);
 894                         WARN_ON_ONCE(1);
 895                 }
 896         }
 897
 898         return 0;
 899 }
 900 device_initcall(init_events);