Pileus Git - ~andy/linux/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 DECLARE_RWSEM(trace_event_mutex);
  18
  19 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
  20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
  21
  22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  23
  24 static int next_event_type = __TRACE_LAST_TYPE + 1;
  25
  26 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  27 {
  28         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  29
  30         seq_write(m, s->buffer, len);
  31
  32         trace_seq_init(s);
  33 }
  34
  35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  36 {
  37         struct trace_seq *s = &iter->seq;
  38         struct trace_entry *entry = iter->ent;
  39         struct bprint_entry *field;
  40         int ret;
  41
  42         trace_assign_type(field, entry);
  43
  44         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  45         if (!ret)
  46                 return TRACE_TYPE_PARTIAL_LINE;
  47
  48         return TRACE_TYPE_HANDLED;
  49 }
  50
  51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  52 {
  53         struct trace_seq *s = &iter->seq;
  54         struct trace_entry *entry = iter->ent;
  55         struct print_entry *field;
  56         int ret;
  57
  58         trace_assign_type(field, entry);
  59
  60         ret = trace_seq_printf(s, "%s", field->buf);
  61         if (!ret)
  62                 return TRACE_TYPE_PARTIAL_LINE;
  63
  64         return TRACE_TYPE_HANDLED;
  65 }
  66
  67 /**
  68  * trace_seq_printf - sequence printing of trace information
  69  * @s: trace sequence descriptor
  70  * @fmt: printf format string
  71  *
  72  * The tracer may use either sequence operations or its own
  73  * copy to user routines. To simplify formating of a trace
  74  * trace_seq_printf is used to store strings into a special
  75  * buffer (@s). Then the output may be either used by
  76  * the sequencer or pulled into another buffer.
  77  */
  78 int
  79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  80 {
  81         int len = (PAGE_SIZE - 1) - s->len;
  82         va_list ap;
  83         int ret;
  84
  85         if (!len)
  86                 return 0;
  87
  88         va_start(ap, fmt);
  89         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  90         va_end(ap);
  91
  92         /* If we can't write it all, don't bother writing anything */
  93         if (ret >= len)
  94                 return 0;
  95
  96         s->len += ret;
  97
  98         return len;
  99 }
 100 EXPORT_SYMBOL_GPL(trace_seq_printf);
 101
 102 /**
 103  * trace_seq_vprintf - sequence printing of trace information
 104  * @s: trace sequence descriptor
 105  * @fmt: printf format string
 106  *
 107  * The tracer may use either sequence operations or its own
 108  * copy to user routines. To simplify formating of a trace
 109  * trace_seq_printf is used to store strings into a special
 110  * buffer (@s). Then the output may be either used by
 111  * the sequencer or pulled into another buffer.
 112  */
 113 int
 114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 115 {
 116         int len = (PAGE_SIZE - 1) - s->len;
 117         int ret;
 118
 119         if (!len)
 120                 return 0;
 121
 122         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 123
 124         /* If we can't write it all, don't bother writing anything */
 125         if (ret >= len)
 126                 return 0;
 127
 128         s->len += ret;
 129
 130         return len;
 131 }
 132 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 133
 134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 135 {
 136         int len = (PAGE_SIZE - 1) - s->len;
 137         int ret;
 138
 139         if (!len)
 140                 return 0;
 141
 142         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 143
 144         /* If we can't write it all, don't bother writing anything */
 145         if (ret >= len)
 146                 return 0;
 147
 148         s->len += ret;
 149
 150         return len;
 151 }
 152
 153 /**
 154  * trace_seq_puts - trace sequence printing of simple string
 155  * @s: trace sequence descriptor
 156  * @str: simple string to record
 157  *
 158  * The tracer may use either the sequence operations or its own
 159  * copy to user routines. This function records a simple string
 160  * into a special buffer (@s) for later retrieval by a sequencer
 161  * or other mechanism.
 162  */
 163 int trace_seq_puts(struct trace_seq *s, const char *str)
 164 {
 165         int len = strlen(str);
 166
 167         if (len > ((PAGE_SIZE - 1) - s->len))
 168                 return 0;
 169
 170         memcpy(s->buffer + s->len, str, len);
 171         s->len += len;
 172
 173         return len;
 174 }
 175
 176 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 177 {
 178         if (s->len >= (PAGE_SIZE - 1))
 179                 return 0;
 180
 181         s->buffer[s->len++] = c;
 182
 183         return 1;
 184 }
 185
 186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 187 {
 188         if (len > ((PAGE_SIZE - 1) - s->len))
 189                 return 0;
 190
 191         memcpy(s->buffer + s->len, mem, len);
 192         s->len += len;
 193
 194         return len;
 195 }
 196
 197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 198 {
 199         unsigned char hex[HEX_CHARS];
 200         const unsigned char *data = mem;
 201         int i, j;
 202
 203 #ifdef __BIG_ENDIAN
 204         for (i = 0, j = 0; i < len; i++) {
 205 #else
 206         for (i = len-1, j = 0; i >= 0; i--) {
 207 #endif
 208                 hex[j++] = hex_asc_hi(data[i]);
 209                 hex[j++] = hex_asc_lo(data[i]);
 210         }
 211         hex[j++] = ' ';
 212
 213         return trace_seq_putmem(s, hex, j);
 214 }
 215
 216 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 217 {
 218         void *ret;
 219
 220         if (len > ((PAGE_SIZE - 1) - s->len))
 221                 return NULL;
 222
 223         ret = s->buffer + s->len;
 224         s->len += len;
 225
 226         return ret;
 227 }
 228
 229 int trace_seq_path(struct trace_seq *s, struct path *path)
 230 {
 231         unsigned char *p;
 232
 233         if (s->len >= (PAGE_SIZE - 1))
 234                 return 0;
 235         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 236         if (!IS_ERR(p)) {
 237                 p = mangle_path(s->buffer + s->len, p, "\n");
 238                 if (p) {
 239                         s->len = p - s->buffer;
 240                         return 1;
 241                 }
 242         } else {
 243                 s->buffer[s->len++] = '?';
 244                 return 1;
 245         }
 246
 247         return 0;
 248 }
 249
 250 const char *
 251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 252                        unsigned long flags,
 253                        const struct trace_print_flags *flag_array)
 254 {
 255         unsigned long mask;
 256         const char *str;
 257         const char *ret = p->buffer + p->len;
 258         int i;
 259
 260         for (i = 0;  flag_array[i].name && flags; i++) {
 261
 262                 mask = flag_array[i].mask;
 263                 if ((flags & mask) != mask)
 264                         continue;
 265
 266                 str = flag_array[i].name;
 267                 flags &= ~mask;
 268                 if (p->len && delim)
 269                         trace_seq_puts(p, delim);
 270                 trace_seq_puts(p, str);
 271         }
 272
 273         /* check for left over flags */
 274         if (flags) {
 275                 if (p->len && delim)
 276                         trace_seq_puts(p, delim);
 277                 trace_seq_printf(p, "0x%lx", flags);
 278         }
 279
 280         trace_seq_putc(p, 0);
 281
 282         return ret;
 283 }
 284 EXPORT_SYMBOL(ftrace_print_flags_seq);
 285
 286 const char *
 287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 288                          const struct trace_print_flags *symbol_array)
 289 {
 290         int i;
 291         const char *ret = p->buffer + p->len;
 292
 293         for (i = 0;  symbol_array[i].name; i++) {
 294
 295                 if (val != symbol_array[i].mask)
 296                         continue;
 297
 298                 trace_seq_puts(p, symbol_array[i].name);
 299                 break;
 300         }
 301
 302         if (!p->len)
 303                 trace_seq_printf(p, "0x%lx", val);
 304
 305         trace_seq_putc(p, 0);
 306
 307         return ret;
 308 }
 309 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 310
 311 #ifdef CONFIG_KRETPROBES
 312 static inline const char *kretprobed(const char *name)
 313 {
 314         static const char tramp_name[] = "kretprobe_trampoline";
 315         int size = sizeof(tramp_name);
 316
 317         if (strncmp(tramp_name, name, size) == 0)
 318                 return "[unknown/kretprobe'd]";
 319         return name;
 320 }
 321 #else
 322 static inline const char *kretprobed(const char *name)
 323 {
 324         return name;
 325 }
 326 #endif /* CONFIG_KRETPROBES */
 327
 328 static int
 329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 330 {
 331 #ifdef CONFIG_KALLSYMS
 332         char str[KSYM_SYMBOL_LEN];
 333         const char *name;
 334
 335         kallsyms_lookup(address, NULL, NULL, NULL, str);
 336
 337         name = kretprobed(str);
 338
 339         return trace_seq_printf(s, fmt, name);
 340 #endif
 341         return 1;
 342 }
 343
 344 static int
 345 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 346                      unsigned long address)
 347 {
 348 #ifdef CONFIG_KALLSYMS
 349         char str[KSYM_SYMBOL_LEN];
 350         const char *name;
 351
 352         sprint_symbol(str, address);
 353         name = kretprobed(str);
 354
 355         return trace_seq_printf(s, fmt, name);
 356 #endif
 357         return 1;
 358 }
 359
 360 #ifndef CONFIG_64BIT
 361 # define IP_FMT "%08lx"
 362 #else
 363 # define IP_FMT "%016lx"
 364 #endif
 365
 366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 367                       unsigned long ip, unsigned long sym_flags)
 368 {
 369         struct file *file = NULL;
 370         unsigned long vmstart = 0;
 371         int ret = 1;
 372
 373         if (mm) {
 374                 const struct vm_area_struct *vma;
 375
 376                 down_read(&mm->mmap_sem);
 377                 vma = find_vma(mm, ip);
 378                 if (vma) {
 379                         file = vma->vm_file;
 380                         vmstart = vma->vm_start;
 381                 }
 382                 if (file) {
 383                         ret = trace_seq_path(s, &file->f_path);
 384                         if (ret)
 385                                 ret = trace_seq_printf(s, "[+0x%lx]",
 386                                                        ip - vmstart);
 387                 }
 388                 up_read(&mm->mmap_sem);
 389         }
 390         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 391                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 392         return ret;
 393 }
 394
 395 int
 396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 397                       unsigned long sym_flags)
 398 {
 399         struct mm_struct *mm = NULL;
 400         int ret = 1;
 401         unsigned int i;
 402
 403         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 404                 struct task_struct *task;
 405                 /*
 406                  * we do the lookup on the thread group leader,
 407                  * since individual threads might have already quit!
 408                  */
 409                 rcu_read_lock();
 410                 task = find_task_by_vpid(entry->tgid);
 411                 if (task)
 412                         mm = get_task_mm(task);
 413                 rcu_read_unlock();
 414         }
 415
 416         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 417                 unsigned long ip = entry->caller[i];
 418
 419                 if (ip == ULONG_MAX || !ret)
 420                         break;
 421                 if (ret)
 422                         ret = trace_seq_puts(s, " => ");
 423                 if (!ip) {
 424                         if (ret)
 425                                 ret = trace_seq_puts(s, "??");
 426                         if (ret)
 427                                 ret = trace_seq_puts(s, "\n");
 428                         continue;
 429                 }
 430                 if (!ret)
 431                         break;
 432                 if (ret)
 433                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 434                 ret = trace_seq_puts(s, "\n");
 435         }
 436
 437         if (mm)
 438                 mmput(mm);
 439         return ret;
 440 }
 441
 442 int
 443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 444 {
 445         int ret;
 446
 447         if (!ip)
 448                 return trace_seq_printf(s, "0");
 449
 450         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 451                 ret = seq_print_sym_offset(s, "%s", ip);
 452         else
 453                 ret = seq_print_sym_short(s, "%s", ip);
 454
 455         if (!ret)
 456                 return 0;
 457
 458         if (sym_flags & TRACE_ITER_SYM_ADDR)
 459                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 460         return ret;
 461 }
 462
 463 static int
 464 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 465 {
 466         int hardirq, softirq;
 467         char comm[TASK_COMM_LEN];
 468         int ret;
 469
 470         trace_find_cmdline(entry->pid, comm);
 471         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 472         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 473
 474         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 475                               comm, entry->pid, cpu,
 476                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 477                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 478                                   'X' : '.',
 479                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 480                                 'N' : '.',
 481                               (hardirq && softirq) ? 'H' :
 482                                 hardirq ? 'h' : softirq ? 's' : '.'))
 483                 return 0;
 484
 485         if (entry->lock_depth < 0)
 486                 ret = trace_seq_putc(s, '.');
 487         else
 488                 ret = trace_seq_printf(s, "%d", entry->lock_depth);
 489         if (!ret)
 490                 return 0;
 491
 492         if (entry->preempt_count)
 493                 return trace_seq_printf(s, "%x", entry->preempt_count);
 494         return trace_seq_putc(s, '.');
 495 }
 496
 497 static unsigned long preempt_mark_thresh = 100;
 498
 499 static int
 500 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 501                     unsigned long rel_usecs)
 502 {
 503         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 504                                 rel_usecs > preempt_mark_thresh ? '!' :
 505                                   rel_usecs > 1 ? '+' : ' ');
 506 }
 507
 508 int trace_print_context(struct trace_iterator *iter)
 509 {
 510         struct trace_seq *s = &iter->seq;
 511         struct trace_entry *entry = iter->ent;
 512         unsigned long long t = ns2usecs(iter->ts);
 513         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 514         unsigned long secs = (unsigned long)t;
 515         char comm[TASK_COMM_LEN];
 516
 517         trace_find_cmdline(entry->pid, comm);
 518
 519         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 520                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 521 }
 522
 523 int trace_print_lat_context(struct trace_iterator *iter)
 524 {
 525         u64 next_ts;
 526         int ret;
 527         struct trace_seq *s = &iter->seq;
 528         struct trace_entry *entry = iter->ent,
 529                            *next_entry = trace_find_next_entry(iter, NULL,
 530                                                                &next_ts);
 531         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 532         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 533         unsigned long rel_usecs;
 534
 535         if (!next_entry)
 536                 next_ts = iter->ts;
 537         rel_usecs = ns2usecs(next_ts - iter->ts);
 538
 539         if (verbose) {
 540                 char comm[TASK_COMM_LEN];
 541
 542                 trace_find_cmdline(entry->pid, comm);
 543
 544                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 545                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 546                                        entry->pid, iter->cpu, entry->flags,
 547                                        entry->preempt_count, iter->idx,
 548                                        ns2usecs(iter->ts),
 549                                        abs_usecs / USEC_PER_MSEC,
 550                                        abs_usecs % USEC_PER_MSEC,
 551                                        rel_usecs / USEC_PER_MSEC,
 552                                        rel_usecs % USEC_PER_MSEC);
 553         } else {
 554                 ret = lat_print_generic(s, entry, iter->cpu);
 555                 if (ret)
 556                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 557         }
 558
 559         return ret;
 560 }
 561
 562 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 563
 564 static int task_state_char(unsigned long state)
 565 {
 566         int bit = state ? __ffs(state) + 1 : 0;
 567
 568         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 569 }
 570
 571 /**
 572  * ftrace_find_event - find a registered event
 573  * @type: the type of event to look for
 574  *
 575  * Returns an event of type @type otherwise NULL
 576  * Called with trace_event_read_lock() held.
 577  */
 578 struct trace_event *ftrace_find_event(int type)
 579 {
 580         struct trace_event *event;
 581         struct hlist_node *n;
 582         unsigned key;
 583
 584         key = type & (EVENT_HASHSIZE - 1);
 585
 586         hlist_for_each_entry(event, n, &event_hash[key], node) {
 587                 if (event->type == type)
 588                         return event;
 589         }
 590
 591         return NULL;
 592 }
 593
 594 static LIST_HEAD(ftrace_event_list);
 595
 596 static int trace_search_list(struct list_head **list)
 597 {
 598         struct trace_event *e;
 599         int last = __TRACE_LAST_TYPE;
 600
 601         if (list_empty(&ftrace_event_list)) {
 602                 *list = &ftrace_event_list;
 603                 return last + 1;
 604         }
 605
 606         /*
 607          * We used up all possible max events,
 608          * lets see if somebody freed one.
 609          */
 610         list_for_each_entry(e, &ftrace_event_list, list) {
 611                 if (e->type != last + 1)
 612                         break;
 613                 last++;
 614         }
 615
 616         /* Did we used up all 65 thousand events??? */
 617         if ((last + 1) > FTRACE_MAX_EVENT)
 618                 return 0;
 619
 620         *list = &e->list;
 621         return last + 1;
 622 }
 623
 624 void trace_event_read_lock(void)
 625 {
 626         down_read(&trace_event_mutex);
 627 }
 628
 629 void trace_event_read_unlock(void)
 630 {
 631         up_read(&trace_event_mutex);
 632 }
 633
 634 /**
 635  * register_ftrace_event - register output for an event type
 636  * @event: the event type to register
 637  *
 638  * Event types are stored in a hash and this hash is used to
 639  * find a way to print an event. If the @event->type is set
 640  * then it will use that type, otherwise it will assign a
 641  * type to use.
 642  *
 643  * If you assign your own type, please make sure it is added
 644  * to the trace_type enum in trace.h, to avoid collisions
 645  * with the dynamic types.
 646  *
 647  * Returns the event type number or zero on error.
 648  */
 649 int register_ftrace_event(struct trace_event *event)
 650 {
 651         unsigned key;
 652         int ret = 0;
 653
 654         down_write(&trace_event_mutex);
 655
 656         if (WARN_ON(!event))
 657                 goto out;
 658
 659         INIT_LIST_HEAD(&event->list);
 660
 661         if (!event->type) {
 662                 struct list_head *list = NULL;
 663
 664                 if (next_event_type > FTRACE_MAX_EVENT) {
 665
 666                         event->type = trace_search_list(&list);
 667                         if (!event->type)
 668                                 goto out;
 669
 670                 } else {
 671
 672                         event->type = next_event_type++;
 673                         list = &ftrace_event_list;
 674                 }
 675
 676                 if (WARN_ON(ftrace_find_event(event->type)))
 677                         goto out;
 678
 679                 list_add_tail(&event->list, list);
 680
 681         } else if (event->type > __TRACE_LAST_TYPE) {
 682                 printk(KERN_WARNING "Need to add type to trace.h\n");
 683                 WARN_ON(1);
 684                 goto out;
 685         } else {
 686                 /* Is this event already used */
 687                 if (ftrace_find_event(event->type))
 688                         goto out;
 689         }
 690
 691         if (event->trace == NULL)
 692                 event->trace = trace_nop_print;
 693         if (event->raw == NULL)
 694                 event->raw = trace_nop_print;
 695         if (event->hex == NULL)
 696                 event->hex = trace_nop_print;
 697         if (event->binary == NULL)
 698                 event->binary = trace_nop_print;
 699
 700         key = event->type & (EVENT_HASHSIZE - 1);
 701
 702         hlist_add_head(&event->node, &event_hash[key]);
 703
 704         ret = event->type;
 705  out:
 706         up_write(&trace_event_mutex);
 707
 708         return ret;
 709 }
 710 EXPORT_SYMBOL_GPL(register_ftrace_event);
 711
 712 /*
 713  * Used by module code with the trace_event_mutex held for write.
 714  */
 715 int __unregister_ftrace_event(struct trace_event *event)
 716 {
 717         hlist_del(&event->node);
 718         list_del(&event->list);
 719         return 0;
 720 }
 721
 722 /**
 723  * unregister_ftrace_event - remove a no longer used event
 724  * @event: the event to remove
 725  */
 726 int unregister_ftrace_event(struct trace_event *event)
 727 {
 728         down_write(&trace_event_mutex);
 729         __unregister_ftrace_event(event);
 730         up_write(&trace_event_mutex);
 731
 732         return 0;
 733 }
 734 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 735
 736 /*
 737  * Standard events
 738  */
 739
 740 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 741 {
 742         return TRACE_TYPE_HANDLED;
 743 }
 744
 745 /* TRACE_FN */
 746 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 747 {
 748         struct ftrace_entry *field;
 749         struct trace_seq *s = &iter->seq;
 750
 751         trace_assign_type(field, iter->ent);
 752
 753         if (!seq_print_ip_sym(s, field->ip, flags))
 754                 goto partial;
 755
 756         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 757                 if (!trace_seq_printf(s, " <-"))
 758                         goto partial;
 759                 if (!seq_print_ip_sym(s,
 760                                       field->parent_ip,
 761                                       flags))
 762                         goto partial;
 763         }
 764         if (!trace_seq_printf(s, "\n"))
 765                 goto partial;
 766
 767         return TRACE_TYPE_HANDLED;
 768
 769  partial:
 770         return TRACE_TYPE_PARTIAL_LINE;
 771 }
 772
 773 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 774 {
 775         struct ftrace_entry *field;
 776
 777         trace_assign_type(field, iter->ent);
 778
 779         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 780                               field->ip,
 781                               field->parent_ip))
 782                 return TRACE_TYPE_PARTIAL_LINE;
 783
 784         return TRACE_TYPE_HANDLED;
 785 }
 786
 787 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 788 {
 789         struct ftrace_entry *field;
 790         struct trace_seq *s = &iter->seq;
 791
 792         trace_assign_type(field, iter->ent);
 793
 794         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 795         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 796
 797         return TRACE_TYPE_HANDLED;
 798 }
 799
 800 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 801 {
 802         struct ftrace_entry *field;
 803         struct trace_seq *s = &iter->seq;
 804
 805         trace_assign_type(field, iter->ent);
 806
 807         SEQ_PUT_FIELD_RET(s, field->ip);
 808         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 809
 810         return TRACE_TYPE_HANDLED;
 811 }
 812
 813 static struct trace_event trace_fn_event = {
 814         .type           = TRACE_FN,
 815         .trace          = trace_fn_trace,
 816         .raw            = trace_fn_raw,
 817         .hex            = trace_fn_hex,
 818         .binary         = trace_fn_bin,
 819 };
 820
 821 /* TRACE_CTX an TRACE_WAKE */
 822 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 823                                              char *delim)
 824 {
 825         struct ctx_switch_entry *field;
 826         char comm[TASK_COMM_LEN];
 827         int S, T;
 828
 829
 830         trace_assign_type(field, iter->ent);
 831
 832         T = task_state_char(field->next_state);
 833         S = task_state_char(field->prev_state);
 834         trace_find_cmdline(field->next_pid, comm);
 835         if (!trace_seq_printf(&iter->seq,
 836                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 837                               field->prev_pid,
 838                               field->prev_prio,
 839                               S, delim,
 840                               field->next_cpu,
 841                               field->next_pid,
 842                               field->next_prio,
 843                               T, comm))
 844                 return TRACE_TYPE_PARTIAL_LINE;
 845
 846         return TRACE_TYPE_HANDLED;
 847 }
 848
 849 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 850 {
 851         return trace_ctxwake_print(iter, "==>");
 852 }
 853
 854 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 855                                           int flags)
 856 {
 857         return trace_ctxwake_print(iter, "  +");
 858 }
 859
 860 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 861 {
 862         struct ctx_switch_entry *field;
 863         int T;
 864
 865         trace_assign_type(field, iter->ent);
 866
 867         if (!S)
 868                 task_state_char(field->prev_state);
 869         T = task_state_char(field->next_state);
 870         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 871                               field->prev_pid,
 872                               field->prev_prio,
 873                               S,
 874                               field->next_cpu,
 875                               field->next_pid,
 876                               field->next_prio,
 877                               T))
 878                 return TRACE_TYPE_PARTIAL_LINE;
 879
 880         return TRACE_TYPE_HANDLED;
 881 }
 882
 883 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 884 {
 885         return trace_ctxwake_raw(iter, 0);
 886 }
 887
 888 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 889 {
 890         return trace_ctxwake_raw(iter, '+');
 891 }
 892
 893
 894 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 895 {
 896         struct ctx_switch_entry *field;
 897         struct trace_seq *s = &iter->seq;
 898         int T;
 899
 900         trace_assign_type(field, iter->ent);
 901
 902         if (!S)
 903                 task_state_char(field->prev_state);
 904         T = task_state_char(field->next_state);
 905
 906         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 907         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 908         SEQ_PUT_HEX_FIELD_RET(s, S);
 909         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 910         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 911         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 912         SEQ_PUT_HEX_FIELD_RET(s, T);
 913
 914         return TRACE_TYPE_HANDLED;
 915 }
 916
 917 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 918 {
 919         return trace_ctxwake_hex(iter, 0);
 920 }
 921
 922 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 923 {
 924         return trace_ctxwake_hex(iter, '+');
 925 }
 926
 927 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 928                                            int flags)
 929 {
 930         struct ctx_switch_entry *field;
 931         struct trace_seq *s = &iter->seq;
 932
 933         trace_assign_type(field, iter->ent);
 934
 935         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 936         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 937         SEQ_PUT_FIELD_RET(s, field->prev_state);
 938         SEQ_PUT_FIELD_RET(s, field->next_pid);
 939         SEQ_PUT_FIELD_RET(s, field->next_prio);
 940         SEQ_PUT_FIELD_RET(s, field->next_state);
 941
 942         return TRACE_TYPE_HANDLED;
 943 }
 944
 945 static struct trace_event trace_ctx_event = {
 946         .type           = TRACE_CTX,
 947         .trace          = trace_ctx_print,
 948         .raw            = trace_ctx_raw,
 949         .hex            = trace_ctx_hex,
 950         .binary         = trace_ctxwake_bin,
 951 };
 952
 953 static struct trace_event trace_wake_event = {
 954         .type           = TRACE_WAKE,
 955         .trace          = trace_wake_print,
 956         .raw            = trace_wake_raw,
 957         .hex            = trace_wake_hex,
 958         .binary         = trace_ctxwake_bin,
 959 };
 960
 961 /* TRACE_SPECIAL */
 962 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 963                                              int flags)
 964 {
 965         struct special_entry *field;
 966
 967         trace_assign_type(field, iter->ent);
 968
 969         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 970                               field->arg1,
 971                               field->arg2,
 972                               field->arg3))
 973                 return TRACE_TYPE_PARTIAL_LINE;
 974
 975         return TRACE_TYPE_HANDLED;
 976 }
 977
 978 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 979                                            int flags)
 980 {
 981         struct special_entry *field;
 982         struct trace_seq *s = &iter->seq;
 983
 984         trace_assign_type(field, iter->ent);
 985
 986         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 987         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 988         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 989
 990         return TRACE_TYPE_HANDLED;
 991 }
 992
 993 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 994                                            int flags)
 995 {
 996         struct special_entry *field;
 997         struct trace_seq *s = &iter->seq;
 998
 999         trace_assign_type(field, iter->ent);
1000
1001         SEQ_PUT_FIELD_RET(s, field->arg1);
1002         SEQ_PUT_FIELD_RET(s, field->arg2);
1003         SEQ_PUT_FIELD_RET(s, field->arg3);
1004
1005         return TRACE_TYPE_HANDLED;
1006 }
1007
1008 static struct trace_event trace_special_event = {
1009         .type           = TRACE_SPECIAL,
1010         .trace          = trace_special_print,
1011         .raw            = trace_special_print,
1012         .hex            = trace_special_hex,
1013         .binary         = trace_special_bin,
1014 };
1015
1016 /* TRACE_STACK */
1017
1018 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1019                                            int flags)
1020 {
1021         struct stack_entry *field;
1022         struct trace_seq *s = &iter->seq;
1023         int i;
1024
1025         trace_assign_type(field, iter->ent);
1026
1027         if (!trace_seq_puts(s, "<stack trace>\n"))
1028                 goto partial;
1029         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1030                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1031                         break;
1032                 if (!trace_seq_puts(s, " => "))
1033                         goto partial;
1034
1035                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1036                         goto partial;
1037                 if (!trace_seq_puts(s, "\n"))
1038                         goto partial;
1039         }
1040
1041         return TRACE_TYPE_HANDLED;
1042
1043  partial:
1044         return TRACE_TYPE_PARTIAL_LINE;
1045 }
1046
1047 static struct trace_event trace_stack_event = {
1048         .type           = TRACE_STACK,
1049         .trace          = trace_stack_print,
1050         .raw            = trace_special_print,
1051         .hex            = trace_special_hex,
1052         .binary         = trace_special_bin,
1053 };
1054
1055 /* TRACE_USER_STACK */
1056 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1057                                                 int flags)
1058 {
1059         struct userstack_entry *field;
1060         struct trace_seq *s = &iter->seq;
1061
1062         trace_assign_type(field, iter->ent);
1063
1064         if (!trace_seq_puts(s, "<user stack trace>\n"))
1065                 goto partial;
1066
1067         if (!seq_print_userip_objs(field, s, flags))
1068                 goto partial;
1069
1070         return TRACE_TYPE_HANDLED;
1071
1072  partial:
1073         return TRACE_TYPE_PARTIAL_LINE;
1074 }
1075
1076 static struct trace_event trace_user_stack_event = {
1077         .type           = TRACE_USER_STACK,
1078         .trace          = trace_user_stack_print,
1079         .raw            = trace_special_print,
1080         .hex            = trace_special_hex,
1081         .binary         = trace_special_bin,
1082 };
1083
1084 /* TRACE_BPRINT */
1085 static enum print_line_t
1086 trace_bprint_print(struct trace_iterator *iter, int flags)
1087 {
1088         struct trace_entry *entry = iter->ent;
1089         struct trace_seq *s = &iter->seq;
1090         struct bprint_entry *field;
1091
1092         trace_assign_type(field, entry);
1093
1094         if (!seq_print_ip_sym(s, field->ip, flags))
1095                 goto partial;
1096
1097         if (!trace_seq_puts(s, ": "))
1098                 goto partial;
1099
1100         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1101                 goto partial;
1102
1103         return TRACE_TYPE_HANDLED;
1104
1105  partial:
1106         return TRACE_TYPE_PARTIAL_LINE;
1107 }
1108
1109
1110 static enum print_line_t
1111 trace_bprint_raw(struct trace_iterator *iter, int flags)
1112 {
1113         struct bprint_entry *field;
1114         struct trace_seq *s = &iter->seq;
1115
1116         trace_assign_type(field, iter->ent);
1117
1118         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1119                 goto partial;
1120
1121         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1122                 goto partial;
1123
1124         return TRACE_TYPE_HANDLED;
1125
1126  partial:
1127         return TRACE_TYPE_PARTIAL_LINE;
1128 }
1129
1130
1131 static struct trace_event trace_bprint_event = {
1132         .type           = TRACE_BPRINT,
1133         .trace          = trace_bprint_print,
1134         .raw            = trace_bprint_raw,
1135 };
1136
1137 /* TRACE_PRINT */
1138 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1139                                            int flags)
1140 {
1141         struct print_entry *field;
1142         struct trace_seq *s = &iter->seq;
1143
1144         trace_assign_type(field, iter->ent);
1145
1146         if (!seq_print_ip_sym(s, field->ip, flags))
1147                 goto partial;
1148
1149         if (!trace_seq_printf(s, ": %s", field->buf))
1150                 goto partial;
1151
1152         return TRACE_TYPE_HANDLED;
1153
1154  partial:
1155         return TRACE_TYPE_PARTIAL_LINE;
1156 }
1157
1158 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1159 {
1160         struct print_entry *field;
1161
1162         trace_assign_type(field, iter->ent);
1163
1164         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1165                 goto partial;
1166
1167         return TRACE_TYPE_HANDLED;
1168
1169  partial:
1170         return TRACE_TYPE_PARTIAL_LINE;
1171 }
1172
1173 static struct trace_event trace_print_event = {
1174         .type           = TRACE_PRINT,
1175         .trace          = trace_print_print,
1176         .raw            = trace_print_raw,
1177 };
1178
1179
1180 static struct trace_event *events[] __initdata = {
1181         &trace_fn_event,
1182         &trace_ctx_event,
1183         &trace_wake_event,
1184         &trace_special_event,
1185         &trace_stack_event,
1186         &trace_user_stack_event,
1187         &trace_bprint_event,
1188         &trace_print_event,
1189         NULL
1190 };
1191
1192 __init static int init_events(void)
1193 {
1194         struct trace_event *event;
1195         int i, ret;
1196
1197         for (i = 0; events[i]; i++) {
1198                 event = events[i];
1199
1200                 ret = register_ftrace_event(event);
1201                 if (!ret) {
1202                         printk(KERN_WARNING "event %d failed to register\n",
1203                                event->type);
1204                         WARN_ON_ONCE(1);
1205                 }
1206         }
1207
1208         return 0;
1209 }
1210 device_initcall(init_events);