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 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  23 {
  24         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  25
  26         s->buffer[len] = 0;
  27         seq_puts(m, s->buffer);
  28
  29         trace_seq_init(s);
  30 }
  31
  32 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  33 {
  34         struct trace_seq *s = &iter->seq;
  35         struct trace_entry *entry = iter->ent;
  36         struct bprint_entry *field;
  37         int ret;
  38
  39         trace_assign_type(field, entry);
  40
  41         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  42         if (!ret)
  43                 return TRACE_TYPE_PARTIAL_LINE;
  44
  45         return TRACE_TYPE_HANDLED;
  46 }
  47
  48 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  49 {
  50         struct trace_seq *s = &iter->seq;
  51         struct trace_entry *entry = iter->ent;
  52         struct print_entry *field;
  53         int ret;
  54
  55         trace_assign_type(field, entry);
  56
  57         ret = trace_seq_printf(s, "%s", field->buf);
  58         if (!ret)
  59                 return TRACE_TYPE_PARTIAL_LINE;
  60
  61         return TRACE_TYPE_HANDLED;
  62 }
  63
  64 /**
  65  * trace_seq_printf - sequence printing of trace information
  66  * @s: trace sequence descriptor
  67  * @fmt: printf format string
  68  *
  69  * The tracer may use either sequence operations or its own
  70  * copy to user routines. To simplify formating of a trace
  71  * trace_seq_printf is used to store strings into a special
  72  * buffer (@s). Then the output may be either used by
  73  * the sequencer or pulled into another buffer.
  74  */
  75 int
  76 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  77 {
  78         int len = (PAGE_SIZE - 1) - s->len;
  79         va_list ap;
  80         int ret;
  81
  82         if (!len)
  83                 return 0;
  84
  85         va_start(ap, fmt);
  86         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  87         va_end(ap);
  88
  89         /* If we can't write it all, don't bother writing anything */
  90         if (ret >= len)
  91                 return 0;
  92
  93         s->len += ret;
  94
  95         return len;
  96 }
  97
  98 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  99 {
 100         int len = (PAGE_SIZE - 1) - s->len;
 101         int ret;
 102
 103         if (!len)
 104                 return 0;
 105
 106         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 107
 108         /* If we can't write it all, don't bother writing anything */
 109         if (ret >= len)
 110                 return 0;
 111
 112         s->len += ret;
 113
 114         return len;
 115 }
 116
 117 /**
 118  * trace_seq_puts - trace sequence printing of simple string
 119  * @s: trace sequence descriptor
 120  * @str: simple string to record
 121  *
 122  * The tracer may use either the sequence operations or its own
 123  * copy to user routines. This function records a simple string
 124  * into a special buffer (@s) for later retrieval by a sequencer
 125  * or other mechanism.
 126  */
 127 int trace_seq_puts(struct trace_seq *s, const char *str)
 128 {
 129         int len = strlen(str);
 130
 131         if (len > ((PAGE_SIZE - 1) - s->len))
 132                 return 0;
 133
 134         memcpy(s->buffer + s->len, str, len);
 135         s->len += len;
 136
 137         return len;
 138 }
 139
 140 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 141 {
 142         if (s->len >= (PAGE_SIZE - 1))
 143                 return 0;
 144
 145         s->buffer[s->len++] = c;
 146
 147         return 1;
 148 }
 149
 150 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 151 {
 152         if (len > ((PAGE_SIZE - 1) - s->len))
 153                 return 0;
 154
 155         memcpy(s->buffer + s->len, mem, len);
 156         s->len += len;
 157
 158         return len;
 159 }
 160
 161 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 162 {
 163         unsigned char hex[HEX_CHARS];
 164         const unsigned char *data = mem;
 165         int i, j;
 166
 167 #ifdef __BIG_ENDIAN
 168         for (i = 0, j = 0; i < len; i++) {
 169 #else
 170         for (i = len-1, j = 0; i >= 0; i--) {
 171 #endif
 172                 hex[j++] = hex_asc_hi(data[i]);
 173                 hex[j++] = hex_asc_lo(data[i]);
 174         }
 175         hex[j++] = ' ';
 176
 177         return trace_seq_putmem(s, hex, j);
 178 }
 179
 180 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 181 {
 182         void *ret;
 183
 184         if (len > ((PAGE_SIZE - 1) - s->len))
 185                 return NULL;
 186
 187         ret = s->buffer + s->len;
 188         s->len += len;
 189
 190         return ret;
 191 }
 192
 193 int trace_seq_path(struct trace_seq *s, struct path *path)
 194 {
 195         unsigned char *p;
 196
 197         if (s->len >= (PAGE_SIZE - 1))
 198                 return 0;
 199         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 200         if (!IS_ERR(p)) {
 201                 p = mangle_path(s->buffer + s->len, p, "\n");
 202                 if (p) {
 203                         s->len = p - s->buffer;
 204                         return 1;
 205                 }
 206         } else {
 207                 s->buffer[s->len++] = '?';
 208                 return 1;
 209         }
 210
 211         return 0;
 212 }
 213
 214 #ifdef CONFIG_KRETPROBES
 215 static inline const char *kretprobed(const char *name)
 216 {
 217         static const char tramp_name[] = "kretprobe_trampoline";
 218         int size = sizeof(tramp_name);
 219
 220         if (strncmp(tramp_name, name, size) == 0)
 221                 return "[unknown/kretprobe'd]";
 222         return name;
 223 }
 224 #else
 225 static inline const char *kretprobed(const char *name)
 226 {
 227         return name;
 228 }
 229 #endif /* CONFIG_KRETPROBES */
 230
 231 static int
 232 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 233 {
 234 #ifdef CONFIG_KALLSYMS
 235         char str[KSYM_SYMBOL_LEN];
 236         const char *name;
 237
 238         kallsyms_lookup(address, NULL, NULL, NULL, str);
 239
 240         name = kretprobed(str);
 241
 242         return trace_seq_printf(s, fmt, name);
 243 #endif
 244         return 1;
 245 }
 246
 247 static int
 248 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 249                      unsigned long address)
 250 {
 251 #ifdef CONFIG_KALLSYMS
 252         char str[KSYM_SYMBOL_LEN];
 253         const char *name;
 254
 255         sprint_symbol(str, address);
 256         name = kretprobed(str);
 257
 258         return trace_seq_printf(s, fmt, name);
 259 #endif
 260         return 1;
 261 }
 262
 263 #ifndef CONFIG_64BIT
 264 # define IP_FMT "%08lx"
 265 #else
 266 # define IP_FMT "%016lx"
 267 #endif
 268
 269 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 270                       unsigned long ip, unsigned long sym_flags)
 271 {
 272         struct file *file = NULL;
 273         unsigned long vmstart = 0;
 274         int ret = 1;
 275
 276         if (mm) {
 277                 const struct vm_area_struct *vma;
 278
 279                 down_read(&mm->mmap_sem);
 280                 vma = find_vma(mm, ip);
 281                 if (vma) {
 282                         file = vma->vm_file;
 283                         vmstart = vma->vm_start;
 284                 }
 285                 if (file) {
 286                         ret = trace_seq_path(s, &file->f_path);
 287                         if (ret)
 288                                 ret = trace_seq_printf(s, "[+0x%lx]",
 289                                                        ip - vmstart);
 290                 }
 291                 up_read(&mm->mmap_sem);
 292         }
 293         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 294                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 295         return ret;
 296 }
 297
 298 int
 299 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 300                       unsigned long sym_flags)
 301 {
 302         struct mm_struct *mm = NULL;
 303         int ret = 1;
 304         unsigned int i;
 305
 306         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 307                 struct task_struct *task;
 308                 /*
 309                  * we do the lookup on the thread group leader,
 310                  * since individual threads might have already quit!
 311                  */
 312                 rcu_read_lock();
 313                 task = find_task_by_vpid(entry->ent.tgid);
 314                 if (task)
 315                         mm = get_task_mm(task);
 316                 rcu_read_unlock();
 317         }
 318
 319         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 320                 unsigned long ip = entry->caller[i];
 321
 322                 if (ip == ULONG_MAX || !ret)
 323                         break;
 324                 if (i && ret)
 325                         ret = trace_seq_puts(s, " <- ");
 326                 if (!ip) {
 327                         if (ret)
 328                                 ret = trace_seq_puts(s, "??");
 329                         continue;
 330                 }
 331                 if (!ret)
 332                         break;
 333                 if (ret)
 334                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 335         }
 336
 337         if (mm)
 338                 mmput(mm);
 339         return ret;
 340 }
 341
 342 int
 343 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 344 {
 345         int ret;
 346
 347         if (!ip)
 348                 return trace_seq_printf(s, "0");
 349
 350         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 351                 ret = seq_print_sym_offset(s, "%s", ip);
 352         else
 353                 ret = seq_print_sym_short(s, "%s", ip);
 354
 355         if (!ret)
 356                 return 0;
 357
 358         if (sym_flags & TRACE_ITER_SYM_ADDR)
 359                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 360         return ret;
 361 }
 362
 363 static int
 364 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 365 {
 366         int hardirq, softirq;
 367         char comm[TASK_COMM_LEN];
 368
 369         trace_find_cmdline(entry->pid, comm);
 370         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 371         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 372
 373         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 374                               comm, entry->pid, cpu,
 375                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 376                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 377                                   'X' : '.',
 378                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 379                                 'N' : '.',
 380                               (hardirq && softirq) ? 'H' :
 381                                 hardirq ? 'h' : softirq ? 's' : '.'))
 382                 return 0;
 383
 384         if (entry->preempt_count)
 385                 return trace_seq_printf(s, "%x", entry->preempt_count);
 386         return trace_seq_puts(s, ".");
 387 }
 388
 389 static unsigned long preempt_mark_thresh = 100;
 390
 391 static int
 392 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 393                     unsigned long rel_usecs)
 394 {
 395         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 396                                 rel_usecs > preempt_mark_thresh ? '!' :
 397                                   rel_usecs > 1 ? '+' : ' ');
 398 }
 399
 400 int trace_print_context(struct trace_iterator *iter)
 401 {
 402         struct trace_seq *s = &iter->seq;
 403         struct trace_entry *entry = iter->ent;
 404         unsigned long long t = ns2usecs(iter->ts);
 405         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 406         unsigned long secs = (unsigned long)t;
 407         char comm[TASK_COMM_LEN];
 408
 409         trace_find_cmdline(entry->pid, comm);
 410
 411         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 412                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 413 }
 414
 415 int trace_print_lat_context(struct trace_iterator *iter)
 416 {
 417         u64 next_ts;
 418         int ret;
 419         struct trace_seq *s = &iter->seq;
 420         struct trace_entry *entry = iter->ent,
 421                            *next_entry = trace_find_next_entry(iter, NULL,
 422                                                                &next_ts);
 423         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 424         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 425         unsigned long rel_usecs;
 426
 427         if (!next_entry)
 428                 next_ts = iter->ts;
 429         rel_usecs = ns2usecs(next_ts - iter->ts);
 430
 431         if (verbose) {
 432                 char comm[TASK_COMM_LEN];
 433
 434                 trace_find_cmdline(entry->pid, comm);
 435
 436                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 437                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 438                                        entry->pid, iter->cpu, entry->flags,
 439                                        entry->preempt_count, iter->idx,
 440                                        ns2usecs(iter->ts),
 441                                        abs_usecs / USEC_PER_MSEC,
 442                                        abs_usecs % USEC_PER_MSEC,
 443                                        rel_usecs / USEC_PER_MSEC,
 444                                        rel_usecs % USEC_PER_MSEC);
 445         } else {
 446                 ret = lat_print_generic(s, entry, iter->cpu);
 447                 if (ret)
 448                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 449         }
 450
 451         return ret;
 452 }
 453
 454 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 455
 456 static int task_state_char(unsigned long state)
 457 {
 458         int bit = state ? __ffs(state) + 1 : 0;
 459
 460         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 461 }
 462
 463 /**
 464  * ftrace_find_event - find a registered event
 465  * @type: the type of event to look for
 466  *
 467  * Returns an event of type @type otherwise NULL
 468  */
 469 struct trace_event *ftrace_find_event(int type)
 470 {
 471         struct trace_event *event;
 472         struct hlist_node *n;
 473         unsigned key;
 474
 475         key = type & (EVENT_HASHSIZE - 1);
 476
 477         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 478                 if (event->type == type)
 479                         return event;
 480         }
 481
 482         return NULL;
 483 }
 484
 485 /**
 486  * register_ftrace_event - register output for an event type
 487  * @event: the event type to register
 488  *
 489  * Event types are stored in a hash and this hash is used to
 490  * find a way to print an event. If the @event->type is set
 491  * then it will use that type, otherwise it will assign a
 492  * type to use.
 493  *
 494  * If you assign your own type, please make sure it is added
 495  * to the trace_type enum in trace.h, to avoid collisions
 496  * with the dynamic types.
 497  *
 498  * Returns the event type number or zero on error.
 499  */
 500 int register_ftrace_event(struct trace_event *event)
 501 {
 502         unsigned key;
 503         int ret = 0;
 504
 505         mutex_lock(&trace_event_mutex);
 506
 507         if (!event) {
 508                 ret = next_event_type++;
 509                 goto out;
 510         }
 511
 512         if (!event->type)
 513                 event->type = next_event_type++;
 514         else if (event->type > __TRACE_LAST_TYPE) {
 515                 printk(KERN_WARNING "Need to add type to trace.h\n");
 516                 WARN_ON(1);
 517         }
 518
 519         if (ftrace_find_event(event->type))
 520                 goto out;
 521
 522         if (event->trace == NULL)
 523                 event->trace = trace_nop_print;
 524         if (event->raw == NULL)
 525                 event->raw = trace_nop_print;
 526         if (event->hex == NULL)
 527                 event->hex = trace_nop_print;
 528         if (event->binary == NULL)
 529                 event->binary = trace_nop_print;
 530
 531         key = event->type & (EVENT_HASHSIZE - 1);
 532
 533         hlist_add_head_rcu(&event->node, &event_hash[key]);
 534
 535         ret = event->type;
 536  out:
 537         mutex_unlock(&trace_event_mutex);
 538
 539         return ret;
 540 }
 541
 542 /**
 543  * unregister_ftrace_event - remove a no longer used event
 544  * @event: the event to remove
 545  */
 546 int unregister_ftrace_event(struct trace_event *event)
 547 {
 548         mutex_lock(&trace_event_mutex);
 549         hlist_del(&event->node);
 550         mutex_unlock(&trace_event_mutex);
 551
 552         return 0;
 553 }
 554
 555 /*
 556  * Standard events
 557  */
 558
 559 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 560 {
 561         return TRACE_TYPE_HANDLED;
 562 }
 563
 564 /* TRACE_FN */
 565 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 566 {
 567         struct ftrace_entry *field;
 568         struct trace_seq *s = &iter->seq;
 569
 570         trace_assign_type(field, iter->ent);
 571
 572         if (!seq_print_ip_sym(s, field->ip, flags))
 573                 goto partial;
 574
 575         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 576                 if (!trace_seq_printf(s, " <-"))
 577                         goto partial;
 578                 if (!seq_print_ip_sym(s,
 579                                       field->parent_ip,
 580                                       flags))
 581                         goto partial;
 582         }
 583         if (!trace_seq_printf(s, "\n"))
 584                 goto partial;
 585
 586         return TRACE_TYPE_HANDLED;
 587
 588  partial:
 589         return TRACE_TYPE_PARTIAL_LINE;
 590 }
 591
 592 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 593 {
 594         struct ftrace_entry *field;
 595
 596         trace_assign_type(field, iter->ent);
 597
 598         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 599                               field->ip,
 600                               field->parent_ip))
 601                 return TRACE_TYPE_PARTIAL_LINE;
 602
 603         return TRACE_TYPE_HANDLED;
 604 }
 605
 606 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 607 {
 608         struct ftrace_entry *field;
 609         struct trace_seq *s = &iter->seq;
 610
 611         trace_assign_type(field, iter->ent);
 612
 613         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 614         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 615
 616         return TRACE_TYPE_HANDLED;
 617 }
 618
 619 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 620 {
 621         struct ftrace_entry *field;
 622         struct trace_seq *s = &iter->seq;
 623
 624         trace_assign_type(field, iter->ent);
 625
 626         SEQ_PUT_FIELD_RET(s, field->ip);
 627         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 628
 629         return TRACE_TYPE_HANDLED;
 630 }
 631
 632 static struct trace_event trace_fn_event = {
 633         .type           = TRACE_FN,
 634         .trace          = trace_fn_trace,
 635         .raw            = trace_fn_raw,
 636         .hex            = trace_fn_hex,
 637         .binary         = trace_fn_bin,
 638 };
 639
 640 /* TRACE_CTX an TRACE_WAKE */
 641 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 642                                              char *delim)
 643 {
 644         struct ctx_switch_entry *field;
 645         char comm[TASK_COMM_LEN];
 646         int S, T;
 647
 648
 649         trace_assign_type(field, iter->ent);
 650
 651         T = task_state_char(field->next_state);
 652         S = task_state_char(field->prev_state);
 653         trace_find_cmdline(field->next_pid, comm);
 654         if (!trace_seq_printf(&iter->seq,
 655                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 656                               field->prev_pid,
 657                               field->prev_prio,
 658                               S, delim,
 659                               field->next_cpu,
 660                               field->next_pid,
 661                               field->next_prio,
 662                               T, comm))
 663                 return TRACE_TYPE_PARTIAL_LINE;
 664
 665         return TRACE_TYPE_HANDLED;
 666 }
 667
 668 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 669 {
 670         return trace_ctxwake_print(iter, "==>");
 671 }
 672
 673 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 674                                           int flags)
 675 {
 676         return trace_ctxwake_print(iter, "  +");
 677 }
 678
 679 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 680 {
 681         struct ctx_switch_entry *field;
 682         int T;
 683
 684         trace_assign_type(field, iter->ent);
 685
 686         if (!S)
 687                 task_state_char(field->prev_state);
 688         T = task_state_char(field->next_state);
 689         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 690                               field->prev_pid,
 691                               field->prev_prio,
 692                               S,
 693                               field->next_cpu,
 694                               field->next_pid,
 695                               field->next_prio,
 696                               T))
 697                 return TRACE_TYPE_PARTIAL_LINE;
 698
 699         return TRACE_TYPE_HANDLED;
 700 }
 701
 702 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 703 {
 704         return trace_ctxwake_raw(iter, 0);
 705 }
 706
 707 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 708 {
 709         return trace_ctxwake_raw(iter, '+');
 710 }
 711
 712
 713 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 714 {
 715         struct ctx_switch_entry *field;
 716         struct trace_seq *s = &iter->seq;
 717         int T;
 718
 719         trace_assign_type(field, iter->ent);
 720
 721         if (!S)
 722                 task_state_char(field->prev_state);
 723         T = task_state_char(field->next_state);
 724
 725         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 726         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 727         SEQ_PUT_HEX_FIELD_RET(s, S);
 728         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 729         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 730         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 731         SEQ_PUT_HEX_FIELD_RET(s, T);
 732
 733         return TRACE_TYPE_HANDLED;
 734 }
 735
 736 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 737 {
 738         return trace_ctxwake_hex(iter, 0);
 739 }
 740
 741 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 742 {
 743         return trace_ctxwake_hex(iter, '+');
 744 }
 745
 746 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 747                                            int flags)
 748 {
 749         struct ctx_switch_entry *field;
 750         struct trace_seq *s = &iter->seq;
 751
 752         trace_assign_type(field, iter->ent);
 753
 754         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 755         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 756         SEQ_PUT_FIELD_RET(s, field->prev_state);
 757         SEQ_PUT_FIELD_RET(s, field->next_pid);
 758         SEQ_PUT_FIELD_RET(s, field->next_prio);
 759         SEQ_PUT_FIELD_RET(s, field->next_state);
 760
 761         return TRACE_TYPE_HANDLED;
 762 }
 763
 764 static struct trace_event trace_ctx_event = {
 765         .type           = TRACE_CTX,
 766         .trace          = trace_ctx_print,
 767         .raw            = trace_ctx_raw,
 768         .hex            = trace_ctx_hex,
 769         .binary         = trace_ctxwake_bin,
 770 };
 771
 772 static struct trace_event trace_wake_event = {
 773         .type           = TRACE_WAKE,
 774         .trace          = trace_wake_print,
 775         .raw            = trace_wake_raw,
 776         .hex            = trace_wake_hex,
 777         .binary         = trace_ctxwake_bin,
 778 };
 779
 780 /* TRACE_SPECIAL */
 781 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 782                                              int flags)
 783 {
 784         struct special_entry *field;
 785
 786         trace_assign_type(field, iter->ent);
 787
 788         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 789                               field->arg1,
 790                               field->arg2,
 791                               field->arg3))
 792                 return TRACE_TYPE_PARTIAL_LINE;
 793
 794         return TRACE_TYPE_HANDLED;
 795 }
 796
 797 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 798                                            int flags)
 799 {
 800         struct special_entry *field;
 801         struct trace_seq *s = &iter->seq;
 802
 803         trace_assign_type(field, iter->ent);
 804
 805         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 806         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 807         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 808
 809         return TRACE_TYPE_HANDLED;
 810 }
 811
 812 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 813                                            int flags)
 814 {
 815         struct special_entry *field;
 816         struct trace_seq *s = &iter->seq;
 817
 818         trace_assign_type(field, iter->ent);
 819
 820         SEQ_PUT_FIELD_RET(s, field->arg1);
 821         SEQ_PUT_FIELD_RET(s, field->arg2);
 822         SEQ_PUT_FIELD_RET(s, field->arg3);
 823
 824         return TRACE_TYPE_HANDLED;
 825 }
 826
 827 static struct trace_event trace_special_event = {
 828         .type           = TRACE_SPECIAL,
 829         .trace          = trace_special_print,
 830         .raw            = trace_special_print,
 831         .hex            = trace_special_hex,
 832         .binary         = trace_special_bin,
 833 };
 834
 835 /* TRACE_STACK */
 836
 837 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 838                                            int flags)
 839 {
 840         struct stack_entry *field;
 841         struct trace_seq *s = &iter->seq;
 842         int i;
 843
 844         trace_assign_type(field, iter->ent);
 845
 846         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 847                 if (i) {
 848                         if (!trace_seq_puts(s, " <= "))
 849                                 goto partial;
 850
 851                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 852                                 goto partial;
 853                 }
 854                 if (!trace_seq_puts(s, "\n"))
 855                         goto partial;
 856         }
 857
 858         return TRACE_TYPE_HANDLED;
 859
 860  partial:
 861         return TRACE_TYPE_PARTIAL_LINE;
 862 }
 863
 864 static struct trace_event trace_stack_event = {
 865         .type           = TRACE_STACK,
 866         .trace          = trace_stack_print,
 867         .raw            = trace_special_print,
 868         .hex            = trace_special_hex,
 869         .binary         = trace_special_bin,
 870 };
 871
 872 /* TRACE_USER_STACK */
 873 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 874                                                 int flags)
 875 {
 876         struct userstack_entry *field;
 877         struct trace_seq *s = &iter->seq;
 878
 879         trace_assign_type(field, iter->ent);
 880
 881         if (!seq_print_userip_objs(field, s, flags))
 882                 goto partial;
 883
 884         if (!trace_seq_putc(s, '\n'))
 885                 goto partial;
 886
 887         return TRACE_TYPE_HANDLED;
 888
 889  partial:
 890         return TRACE_TYPE_PARTIAL_LINE;
 891 }
 892
 893 static struct trace_event trace_user_stack_event = {
 894         .type           = TRACE_USER_STACK,
 895         .trace          = trace_user_stack_print,
 896         .raw            = trace_special_print,
 897         .hex            = trace_special_hex,
 898         .binary         = trace_special_bin,
 899 };
 900
 901 /* TRACE_BPRINT */
 902 static enum print_line_t
 903 trace_bprint_print(struct trace_iterator *iter, int flags)
 904 {
 905         struct trace_entry *entry = iter->ent;
 906         struct trace_seq *s = &iter->seq;
 907         struct bprint_entry *field;
 908
 909         trace_assign_type(field, entry);
 910
 911         if (!seq_print_ip_sym(s, field->ip, flags))
 912                 goto partial;
 913
 914         if (!trace_seq_puts(s, ": "))
 915                 goto partial;
 916
 917         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 918                 goto partial;
 919
 920         return TRACE_TYPE_HANDLED;
 921
 922  partial:
 923         return TRACE_TYPE_PARTIAL_LINE;
 924 }
 925
 926
 927 static enum print_line_t
 928 trace_bprint_raw(struct trace_iterator *iter, int flags)
 929 {
 930         struct bprint_entry *field;
 931         struct trace_seq *s = &iter->seq;
 932
 933         trace_assign_type(field, iter->ent);
 934
 935         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 936                 goto partial;
 937
 938         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 939                 goto partial;
 940
 941         return TRACE_TYPE_HANDLED;
 942
 943  partial:
 944         return TRACE_TYPE_PARTIAL_LINE;
 945 }
 946
 947
 948 static struct trace_event trace_bprint_event = {
 949         .type           = TRACE_BPRINT,
 950         .trace          = trace_bprint_print,
 951         .raw            = trace_bprint_raw,
 952 };
 953
 954 /* TRACE_PRINT */
 955 static enum print_line_t trace_print_print(struct trace_iterator *iter,
 956                                            int flags)
 957 {
 958         struct print_entry *field;
 959         struct trace_seq *s = &iter->seq;
 960
 961         trace_assign_type(field, iter->ent);
 962
 963         if (!seq_print_ip_sym(s, field->ip, flags))
 964                 goto partial;
 965
 966         if (!trace_seq_printf(s, ": %s", field->buf))
 967                 goto partial;
 968
 969         return TRACE_TYPE_HANDLED;
 970
 971  partial:
 972         return TRACE_TYPE_PARTIAL_LINE;
 973 }
 974
 975 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 976 {
 977         struct print_entry *field;
 978
 979         trace_assign_type(field, iter->ent);
 980
 981         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 982                 goto partial;
 983
 984         return TRACE_TYPE_HANDLED;
 985
 986  partial:
 987         return TRACE_TYPE_PARTIAL_LINE;
 988 }
 989
 990 static struct trace_event trace_print_event = {
 991         .type           = TRACE_PRINT,
 992         .trace          = trace_print_print,
 993         .raw            = trace_print_raw,
 994 };
 995
 996
 997 static struct trace_event *events[] __initdata = {
 998         &trace_fn_event,
 999         &trace_ctx_event,
1000         &trace_wake_event,
1001         &trace_special_event,
1002         &trace_stack_event,
1003         &trace_user_stack_event,
1004         &trace_bprint_event,
1005         &trace_print_event,
1006         NULL
1007 };
1008
1009 __init static int init_events(void)
1010 {
1011         struct trace_event *event;
1012         int i, ret;
1013
1014         for (i = 0; events[i]; i++) {
1015                 event = events[i];
1016
1017                 ret = register_ftrace_event(event);
1018                 if (!ret) {
1019                         printk(KERN_WARNING "event %d failed to register\n",
1020                                event->type);
1021                         WARN_ON_ONCE(1);
1022                 }
1023         }
1024
1025         return 0;
1026 }
1027 device_initcall(init_events);