git.oblomov.eu Git - linux-2.6/blob - 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 void
 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
 297         trace_seq_printf(s, "%8.8s-%-5d ", comm, entry->pid);
 298         trace_seq_printf(s, "%3d", cpu);
 299         trace_seq_printf(s, "%c%c",
 300                         (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 301                          (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' : '.',
 302                         ((entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.'));
 303
 304         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 305         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 306         if (hardirq && softirq) {
 307                 trace_seq_putc(s, 'H');
 308         } else {
 309                 if (hardirq) {
 310                         trace_seq_putc(s, 'h');
 311                 } else {
 312                         if (softirq)
 313                                 trace_seq_putc(s, 's');
 314                         else
 315                                 trace_seq_putc(s, '.');
 316                 }
 317         }
 318
 319         if (entry->preempt_count)
 320                 trace_seq_printf(s, "%x", entry->preempt_count);
 321         else
 322                 trace_seq_puts(s, ".");
 323 }
 324
 325 static unsigned long preempt_mark_thresh = 100;
 326
 327 static void
 328 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 329                     unsigned long rel_usecs)
 330 {
 331         trace_seq_printf(s, " %4lldus", abs_usecs);
 332         if (rel_usecs > preempt_mark_thresh)
 333                 trace_seq_puts(s, "!: ");
 334         else if (rel_usecs > 1)
 335                 trace_seq_puts(s, "+: ");
 336         else
 337                 trace_seq_puts(s, " : ");
 338 }
 339
 340 int trace_print_context(struct trace_iterator *iter)
 341 {
 342         struct trace_seq *s = &iter->seq;
 343         struct trace_entry *entry = iter->ent;
 344         char *comm = trace_find_cmdline(entry->pid);
 345         unsigned long long t = ns2usecs(iter->ts);
 346         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 347         unsigned long secs = (unsigned long)t;
 348
 349         if (!trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid))
 350                 goto partial;
 351         if (!trace_seq_printf(s, "[%03d] ", entry->cpu))
 352                 goto partial;
 353         if (!trace_seq_printf(s, "%5lu.%06lu: ", secs, usec_rem))
 354                 goto partial;
 355
 356         return 0;
 357
 358 partial:
 359         return TRACE_TYPE_PARTIAL_LINE;
 360 }
 361
 362 int trace_print_lat_context(struct trace_iterator *iter)
 363 {
 364         u64 next_ts;
 365         struct trace_seq *s = &iter->seq;
 366         struct trace_entry *entry = iter->ent,
 367                            *next_entry = trace_find_next_entry(iter, NULL,
 368                                                                &next_ts);
 369         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 370         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 371         unsigned long rel_usecs;
 372
 373         if (!next_entry)
 374                 next_ts = iter->ts;
 375         rel_usecs = ns2usecs(next_ts - iter->ts);
 376
 377         if (verbose) {
 378                 char *comm = trace_find_cmdline(entry->pid);
 379                 trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 380                                  " %ld.%03ldms (+%ld.%03ldms): ",
 381                                  comm,
 382                                  entry->pid, entry->cpu, entry->flags,
 383                                  entry->preempt_count, iter->idx,
 384                                  ns2usecs(iter->ts),
 385                                  abs_usecs/1000,
 386                                  abs_usecs % 1000, rel_usecs/1000,
 387                                  rel_usecs % 1000);
 388         } else {
 389                 lat_print_generic(s, entry, entry->cpu);
 390                 lat_print_timestamp(s, abs_usecs, rel_usecs);
 391         }
 392
 393         return 0;
 394 }
 395
 396 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 397
 398 static int task_state_char(unsigned long state)
 399 {
 400         int bit = state ? __ffs(state) + 1 : 0;
 401
 402         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 403 }
 404
 405 /**
 406  * ftrace_find_event - find a registered event
 407  * @type: the type of event to look for
 408  *
 409  * Returns an event of type @type otherwise NULL
 410  */
 411 struct trace_event *ftrace_find_event(int type)
 412 {
 413         struct trace_event *event;
 414         struct hlist_node *n;
 415         unsigned key;
 416
 417         key = type & (EVENT_HASHSIZE - 1);
 418
 419         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 420                 if (event->type == type)
 421                         return event;
 422         }
 423
 424         return NULL;
 425 }
 426
 427 /**
 428  * register_ftrace_event - register output for an event type
 429  * @event: the event type to register
 430  *
 431  * Event types are stored in a hash and this hash is used to
 432  * find a way to print an event. If the @event->type is set
 433  * then it will use that type, otherwise it will assign a
 434  * type to use.
 435  *
 436  * If you assign your own type, please make sure it is added
 437  * to the trace_type enum in trace.h, to avoid collisions
 438  * with the dynamic types.
 439  *
 440  * Returns the event type number or zero on error.
 441  */
 442 int register_ftrace_event(struct trace_event *event)
 443 {
 444         unsigned key;
 445         int ret = 0;
 446
 447         mutex_lock(&trace_event_mutex);
 448
 449         if (!event->type)
 450                 event->type = next_event_type++;
 451         else if (event->type > __TRACE_LAST_TYPE) {
 452                 printk(KERN_WARNING "Need to add type to trace.h\n");
 453                 WARN_ON(1);
 454         }
 455
 456         if (ftrace_find_event(event->type))
 457                 goto out;
 458
 459         key = event->type & (EVENT_HASHSIZE - 1);
 460
 461         hlist_add_head_rcu(&event->node, &event_hash[key]);
 462
 463         ret = event->type;
 464  out:
 465         mutex_unlock(&trace_event_mutex);
 466
 467         return ret;
 468 }
 469
 470 /**
 471  * unregister_ftrace_event - remove a no longer used event
 472  * @event: the event to remove
 473  */
 474 int unregister_ftrace_event(struct trace_event *event)
 475 {
 476         mutex_lock(&trace_event_mutex);
 477         hlist_del(&event->node);
 478         mutex_unlock(&trace_event_mutex);
 479
 480         return 0;
 481 }
 482
 483 /*
 484  * Standard events
 485  */
 486
 487 int trace_nop_print(struct trace_iterator *iter, int flags)
 488 {
 489         return 0;
 490 }
 491
 492 /* TRACE_FN */
 493 static int trace_fn_latency(struct trace_iterator *iter, int flags)
 494 {
 495         struct ftrace_entry *field;
 496         struct trace_seq *s = &iter->seq;
 497
 498         trace_assign_type(field, iter->ent);
 499
 500         if (!seq_print_ip_sym(s, field->ip, flags))
 501                 goto partial;
 502         if (!trace_seq_puts(s, " ("))
 503                 goto partial;
 504         if (!seq_print_ip_sym(s, field->parent_ip, flags))
 505                 goto partial;
 506         if (!trace_seq_puts(s, ")\n"))
 507                 goto partial;
 508
 509         return 0;
 510
 511  partial:
 512         return TRACE_TYPE_PARTIAL_LINE;
 513 }
 514
 515 static int trace_fn_trace(struct trace_iterator *iter, int flags)
 516 {
 517         struct ftrace_entry *field;
 518         struct trace_seq *s = &iter->seq;
 519
 520         trace_assign_type(field, iter->ent);
 521
 522         if (!seq_print_ip_sym(s, field->ip, flags))
 523                 goto partial;
 524
 525         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 526                 if (!trace_seq_printf(s, " <-"))
 527                         goto partial;
 528                 if (!seq_print_ip_sym(s,
 529                                       field->parent_ip,
 530                                       flags))
 531                         goto partial;
 532         }
 533         if (!trace_seq_printf(s, "\n"))
 534                 goto partial;
 535
 536         return 0;
 537
 538  partial:
 539         return TRACE_TYPE_PARTIAL_LINE;
 540 }
 541
 542 static int trace_fn_raw(struct trace_iterator *iter, int flags)
 543 {
 544         struct ftrace_entry *field;
 545
 546         trace_assign_type(field, iter->ent);
 547
 548         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 549                               field->ip,
 550                               field->parent_ip))
 551                 return TRACE_TYPE_PARTIAL_LINE;
 552
 553         return 0;
 554 }
 555
 556 static int trace_fn_hex(struct trace_iterator *iter, int flags)
 557 {
 558         struct ftrace_entry *field;
 559         struct trace_seq *s = &iter->seq;
 560
 561         trace_assign_type(field, iter->ent);
 562
 563         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 564         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 565
 566         return 0;
 567 }
 568
 569 static int trace_fn_bin(struct trace_iterator *iter, int flags)
 570 {
 571         struct ftrace_entry *field;
 572         struct trace_seq *s = &iter->seq;
 573
 574         trace_assign_type(field, iter->ent);
 575
 576         SEQ_PUT_FIELD_RET(s, field->ip);
 577         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 578
 579         return 0;
 580 }
 581
 582 static struct trace_event trace_fn_event = {
 583         .type           = TRACE_FN,
 584         .trace          = trace_fn_trace,
 585         .latency_trace  = trace_fn_latency,
 586         .raw            = trace_fn_raw,
 587         .hex            = trace_fn_hex,
 588         .binary         = trace_fn_bin,
 589 };
 590
 591 /* TRACE_CTX an TRACE_WAKE */
 592 static int trace_ctxwake_print(struct trace_iterator *iter, char *delim)
 593 {
 594         struct ctx_switch_entry *field;
 595         char *comm;
 596         int S, T;
 597
 598         trace_assign_type(field, iter->ent);
 599
 600         T = task_state_char(field->next_state);
 601         S = task_state_char(field->prev_state);
 602         comm = trace_find_cmdline(field->next_pid);
 603         if (!trace_seq_printf(&iter->seq,
 604                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 605                               field->prev_pid,
 606                               field->prev_prio,
 607                               S, delim,
 608                               field->next_cpu,
 609                               field->next_pid,
 610                               field->next_prio,
 611                               T, comm))
 612                 return TRACE_TYPE_PARTIAL_LINE;
 613
 614         return 0;
 615 }
 616
 617 static int trace_ctx_print(struct trace_iterator *iter, int flags)
 618 {
 619         return trace_ctxwake_print(iter, "==>");
 620 }
 621
 622 static int trace_wake_print(struct trace_iterator *iter, int flags)
 623 {
 624         return trace_ctxwake_print(iter, "  +");
 625 }
 626
 627 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 628 {
 629         struct ctx_switch_entry *field;
 630         int T;
 631
 632         trace_assign_type(field, iter->ent);
 633
 634         if (!S)
 635                 task_state_char(field->prev_state);
 636         T = task_state_char(field->next_state);
 637         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 638                               field->prev_pid,
 639                               field->prev_prio,
 640                               S,
 641                               field->next_cpu,
 642                               field->next_pid,
 643                               field->next_prio,
 644                               T))
 645                 return TRACE_TYPE_PARTIAL_LINE;
 646
 647         return 0;
 648 }
 649
 650 static int trace_ctx_raw(struct trace_iterator *iter, int flags)
 651 {
 652         return trace_ctxwake_raw(iter, 0);
 653 }
 654
 655 static int trace_wake_raw(struct trace_iterator *iter, int flags)
 656 {
 657         return trace_ctxwake_raw(iter, '+');
 658 }
 659
 660
 661 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 662 {
 663         struct ctx_switch_entry *field;
 664         struct trace_seq *s = &iter->seq;
 665         int T;
 666
 667         trace_assign_type(field, iter->ent);
 668
 669         if (!S)
 670                 task_state_char(field->prev_state);
 671         T = task_state_char(field->next_state);
 672
 673         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 674         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 675         SEQ_PUT_HEX_FIELD_RET(s, S);
 676         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 677         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 678         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 679         SEQ_PUT_HEX_FIELD_RET(s, T);
 680
 681         return 0;
 682 }
 683
 684 static int trace_ctx_hex(struct trace_iterator *iter, int flags)
 685 {
 686         return trace_ctxwake_hex(iter, 0);
 687 }
 688
 689 static int trace_wake_hex(struct trace_iterator *iter, int flags)
 690 {
 691         return trace_ctxwake_hex(iter, '+');
 692 }
 693
 694 static int trace_ctxwake_bin(struct trace_iterator *iter, int flags)
 695 {
 696         struct ctx_switch_entry *field;
 697         struct trace_seq *s = &iter->seq;
 698
 699         trace_assign_type(field, iter->ent);
 700
 701         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 702         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 703         SEQ_PUT_FIELD_RET(s, field->prev_state);
 704         SEQ_PUT_FIELD_RET(s, field->next_pid);
 705         SEQ_PUT_FIELD_RET(s, field->next_prio);
 706         SEQ_PUT_FIELD_RET(s, field->next_state);
 707
 708         return 0;
 709 }
 710
 711 static struct trace_event trace_ctx_event = {
 712         .type           = TRACE_CTX,
 713         .trace          = trace_ctx_print,
 714         .latency_trace  = trace_ctx_print,
 715         .raw            = trace_ctx_raw,
 716         .hex            = trace_ctx_hex,
 717         .binary         = trace_ctxwake_bin,
 718 };
 719
 720 static struct trace_event trace_wake_event = {
 721         .type           = TRACE_WAKE,
 722         .trace          = trace_wake_print,
 723         .latency_trace  = trace_wake_print,
 724         .raw            = trace_wake_raw,
 725         .hex            = trace_wake_hex,
 726         .binary         = trace_ctxwake_bin,
 727 };
 728
 729 /* TRACE_SPECIAL */
 730 static int trace_special_print(struct trace_iterator *iter, int flags)
 731 {
 732         struct special_entry *field;
 733
 734         trace_assign_type(field, iter->ent);
 735
 736         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 737                               field->arg1,
 738                               field->arg2,
 739                               field->arg3))
 740                 return TRACE_TYPE_PARTIAL_LINE;
 741
 742         return 0;
 743 }
 744
 745 static int trace_special_hex(struct trace_iterator *iter, int flags)
 746 {
 747         struct special_entry *field;
 748         struct trace_seq *s = &iter->seq;
 749
 750         trace_assign_type(field, iter->ent);
 751
 752         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 753         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 754         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 755
 756         return 0;
 757 }
 758
 759 static int trace_special_bin(struct trace_iterator *iter, int flags)
 760 {
 761         struct special_entry *field;
 762         struct trace_seq *s = &iter->seq;
 763
 764         trace_assign_type(field, iter->ent);
 765
 766         SEQ_PUT_FIELD_RET(s, field->arg1);
 767         SEQ_PUT_FIELD_RET(s, field->arg2);
 768         SEQ_PUT_FIELD_RET(s, field->arg3);
 769
 770         return 0;
 771 }
 772
 773 static struct trace_event trace_special_event = {
 774         .type           = TRACE_SPECIAL,
 775         .trace          = trace_special_print,
 776         .latency_trace  = trace_special_print,
 777         .raw            = trace_special_print,
 778         .hex            = trace_special_hex,
 779         .binary         = trace_special_bin,
 780 };
 781
 782 /* TRACE_STACK */
 783
 784 static int trace_stack_print(struct trace_iterator *iter, int flags)
 785 {
 786         struct stack_entry *field;
 787         struct trace_seq *s = &iter->seq;
 788         int i;
 789
 790         trace_assign_type(field, iter->ent);
 791
 792         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 793                 if (i) {
 794                         if (!trace_seq_puts(s, " <= "))
 795                                 goto partial;
 796
 797                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 798                                 goto partial;
 799                 }
 800                 if (!trace_seq_puts(s, "\n"))
 801                         goto partial;
 802         }
 803
 804         return 0;
 805
 806  partial:
 807         return TRACE_TYPE_PARTIAL_LINE;
 808 }
 809
 810 static struct trace_event trace_stack_event = {
 811         .type           = TRACE_STACK,
 812         .trace          = trace_stack_print,
 813         .latency_trace  = trace_stack_print,
 814         .raw            = trace_special_print,
 815         .hex            = trace_special_hex,
 816         .binary         = trace_special_bin,
 817 };
 818
 819 /* TRACE_USER_STACK */
 820 static int trace_user_stack_print(struct trace_iterator *iter, int flags)
 821 {
 822         struct userstack_entry *field;
 823         struct trace_seq *s = &iter->seq;
 824
 825         trace_assign_type(field, iter->ent);
 826
 827         if (!seq_print_userip_objs(field, s, flags))
 828                 goto partial;
 829
 830         if (!trace_seq_putc(s, '\n'))
 831                 goto partial;
 832
 833         return 0;
 834
 835  partial:
 836         return TRACE_TYPE_PARTIAL_LINE;
 837 }
 838
 839 static struct trace_event trace_user_stack_event = {
 840         .type           = TRACE_USER_STACK,
 841         .trace          = trace_user_stack_print,
 842         .latency_trace  = trace_user_stack_print,
 843         .raw            = trace_special_print,
 844         .hex            = trace_special_hex,
 845         .binary         = trace_special_bin,
 846 };
 847
 848 /* TRACE_PRINT */
 849 static int trace_print_print(struct trace_iterator *iter, int flags)
 850 {
 851         struct print_entry *field;
 852         struct trace_seq *s = &iter->seq;
 853
 854         trace_assign_type(field, iter->ent);
 855
 856         if (!seq_print_ip_sym(s, field->ip, flags))
 857                 goto partial;
 858
 859         if (!trace_seq_printf(s, ": %s", field->buf))
 860                 goto partial;
 861
 862         return 0;
 863
 864  partial:
 865         return TRACE_TYPE_PARTIAL_LINE;
 866 }
 867
 868 static int trace_print_raw(struct trace_iterator *iter, int flags)
 869 {
 870         struct print_entry *field;
 871
 872         trace_assign_type(field, iter->ent);
 873
 874         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 875                 goto partial;
 876
 877         return 0;
 878
 879  partial:
 880         return TRACE_TYPE_PARTIAL_LINE;
 881 }
 882
 883 static struct trace_event trace_print_event = {
 884         .type           = TRACE_PRINT,
 885         .trace          = trace_print_print,
 886         .latency_trace  = trace_print_print,
 887         .raw            = trace_print_raw,
 888         .hex            = trace_nop_print,
 889         .binary         = trace_nop_print,
 890 };
 891
 892 static struct trace_event *events[] __initdata = {
 893         &trace_fn_event,
 894         &trace_ctx_event,
 895         &trace_wake_event,
 896         &trace_special_event,
 897         &trace_stack_event,
 898         &trace_user_stack_event,
 899         &trace_print_event,
 900         NULL
 901 };
 902
 903 __init static int init_events(void)
 904 {
 905         struct trace_event *event;
 906         int i, ret;
 907
 908         for (i = 0; events[i]; i++) {
 909                 event = events[i];
 910
 911                 ret = register_ftrace_event(event);
 912                 if (!ret) {
 913                         printk(KERN_WARNING "event %d failed to register\n",
 914                                event->type);
 915                         WARN_ON_ONCE(1);
 916                 }
 917         }
 918
 919         return 0;
 920 }
 921 device_initcall(init_events);