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