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 /**
 464  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 465  * @s: trace seq struct to write to
 466  * @entry: The trace entry field from the ring buffer
 467  *
 468  * Prints the generic fields of irqs off, in hard or softirq, preempt
 469  * count and lock depth.
 470  */
 471 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 472 {
 473         int hardirq, softirq;
 474         int ret;
 475
 476         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 477         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 478
 479         if (!trace_seq_printf(s, "%c%c%c",
 480                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 481                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 482                                   'X' : '.',
 483                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 484                                 'N' : '.',
 485                               (hardirq && softirq) ? 'H' :
 486                                 hardirq ? 'h' : softirq ? 's' : '.'))
 487                 return 0;
 488
 489         if (entry->lock_depth < 0)
 490                 ret = trace_seq_putc(s, '.');
 491         else
 492                 ret = trace_seq_printf(s, "%d", entry->lock_depth);
 493         if (!ret)
 494                 return 0;
 495
 496         if (entry->preempt_count)
 497                 return trace_seq_printf(s, "%x", entry->preempt_count);
 498         return trace_seq_putc(s, '.');
 499 }
 500
 501 static int
 502 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 503 {
 504         char comm[TASK_COMM_LEN];
 505
 506         trace_find_cmdline(entry->pid, comm);
 507
 508         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 509                               comm, entry->pid, cpu))
 510                 return 0;
 511
 512         return trace_print_lat_fmt(s, entry);
 513 }
 514
 515 static unsigned long preempt_mark_thresh = 100;
 516
 517 static int
 518 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 519                     unsigned long rel_usecs)
 520 {
 521         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 522                                 rel_usecs > preempt_mark_thresh ? '!' :
 523                                   rel_usecs > 1 ? '+' : ' ');
 524 }
 525
 526 int trace_print_context(struct trace_iterator *iter)
 527 {
 528         struct trace_seq *s = &iter->seq;
 529         struct trace_entry *entry = iter->ent;
 530         unsigned long long t = ns2usecs(iter->ts);
 531         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 532         unsigned long secs = (unsigned long)t;
 533         char comm[TASK_COMM_LEN];
 534
 535         trace_find_cmdline(entry->pid, comm);
 536
 537         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 538                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 539 }
 540
 541 int trace_print_lat_context(struct trace_iterator *iter)
 542 {
 543         u64 next_ts;
 544         int ret;
 545         struct trace_seq *s = &iter->seq;
 546         struct trace_entry *entry = iter->ent,
 547                            *next_entry = trace_find_next_entry(iter, NULL,
 548                                                                &next_ts);
 549         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 550         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 551         unsigned long rel_usecs;
 552
 553         if (!next_entry)
 554                 next_ts = iter->ts;
 555         rel_usecs = ns2usecs(next_ts - iter->ts);
 556
 557         if (verbose) {
 558                 char comm[TASK_COMM_LEN];
 559
 560                 trace_find_cmdline(entry->pid, comm);
 561
 562                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 563                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 564                                        entry->pid, iter->cpu, entry->flags,
 565                                        entry->preempt_count, iter->idx,
 566                                        ns2usecs(iter->ts),
 567                                        abs_usecs / USEC_PER_MSEC,
 568                                        abs_usecs % USEC_PER_MSEC,
 569                                        rel_usecs / USEC_PER_MSEC,
 570                                        rel_usecs % USEC_PER_MSEC);
 571         } else {
 572                 ret = lat_print_generic(s, entry, iter->cpu);
 573                 if (ret)
 574                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 575         }
 576
 577         return ret;
 578 }
 579
 580 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 581
 582 static int task_state_char(unsigned long state)
 583 {
 584         int bit = state ? __ffs(state) + 1 : 0;
 585
 586         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 587 }
 588
 589 /**
 590  * ftrace_find_event - find a registered event
 591  * @type: the type of event to look for
 592  *
 593  * Returns an event of type @type otherwise NULL
 594  * Called with trace_event_read_lock() held.
 595  */
 596 struct trace_event *ftrace_find_event(int type)
 597 {
 598         struct trace_event *event;
 599         struct hlist_node *n;
 600         unsigned key;
 601
 602         key = type & (EVENT_HASHSIZE - 1);
 603
 604         hlist_for_each_entry(event, n, &event_hash[key], node) {
 605                 if (event->type == type)
 606                         return event;
 607         }
 608
 609         return NULL;
 610 }
 611
 612 static LIST_HEAD(ftrace_event_list);
 613
 614 static int trace_search_list(struct list_head **list)
 615 {
 616         struct trace_event *e;
 617         int last = __TRACE_LAST_TYPE;
 618
 619         if (list_empty(&ftrace_event_list)) {
 620                 *list = &ftrace_event_list;
 621                 return last + 1;
 622         }
 623
 624         /*
 625          * We used up all possible max events,
 626          * lets see if somebody freed one.
 627          */
 628         list_for_each_entry(e, &ftrace_event_list, list) {
 629                 if (e->type != last + 1)
 630                         break;
 631                 last++;
 632         }
 633
 634         /* Did we used up all 65 thousand events??? */
 635         if ((last + 1) > FTRACE_MAX_EVENT)
 636                 return 0;
 637
 638         *list = &e->list;
 639         return last + 1;
 640 }
 641
 642 void trace_event_read_lock(void)
 643 {
 644         down_read(&trace_event_mutex);
 645 }
 646
 647 void trace_event_read_unlock(void)
 648 {
 649         up_read(&trace_event_mutex);
 650 }
 651
 652 /**
 653  * register_ftrace_event - register output for an event type
 654  * @event: the event type to register
 655  *
 656  * Event types are stored in a hash and this hash is used to
 657  * find a way to print an event. If the @event->type is set
 658  * then it will use that type, otherwise it will assign a
 659  * type to use.
 660  *
 661  * If you assign your own type, please make sure it is added
 662  * to the trace_type enum in trace.h, to avoid collisions
 663  * with the dynamic types.
 664  *
 665  * Returns the event type number or zero on error.
 666  */
 667 int register_ftrace_event(struct trace_event *event)
 668 {
 669         unsigned key;
 670         int ret = 0;
 671
 672         down_write(&trace_event_mutex);
 673
 674         if (WARN_ON(!event))
 675                 goto out;
 676
 677         INIT_LIST_HEAD(&event->list);
 678
 679         if (!event->type) {
 680                 struct list_head *list = NULL;
 681
 682                 if (next_event_type > FTRACE_MAX_EVENT) {
 683
 684                         event->type = trace_search_list(&list);
 685                         if (!event->type)
 686                                 goto out;
 687
 688                 } else {
 689
 690                         event->type = next_event_type++;
 691                         list = &ftrace_event_list;
 692                 }
 693
 694                 if (WARN_ON(ftrace_find_event(event->type)))
 695                         goto out;
 696
 697                 list_add_tail(&event->list, list);
 698
 699         } else if (event->type > __TRACE_LAST_TYPE) {
 700                 printk(KERN_WARNING "Need to add type to trace.h\n");
 701                 WARN_ON(1);
 702                 goto out;
 703         } else {
 704                 /* Is this event already used */
 705                 if (ftrace_find_event(event->type))
 706                         goto out;
 707         }
 708
 709         if (event->trace == NULL)
 710                 event->trace = trace_nop_print;
 711         if (event->raw == NULL)
 712                 event->raw = trace_nop_print;
 713         if (event->hex == NULL)
 714                 event->hex = trace_nop_print;
 715         if (event->binary == NULL)
 716                 event->binary = trace_nop_print;
 717
 718         key = event->type & (EVENT_HASHSIZE - 1);
 719
 720         hlist_add_head(&event->node, &event_hash[key]);
 721
 722         ret = event->type;
 723  out:
 724         up_write(&trace_event_mutex);
 725
 726         return ret;
 727 }
 728 EXPORT_SYMBOL_GPL(register_ftrace_event);
 729
 730 /*
 731  * Used by module code with the trace_event_mutex held for write.
 732  */
 733 int __unregister_ftrace_event(struct trace_event *event)
 734 {
 735         hlist_del(&event->node);
 736         list_del(&event->list);
 737         return 0;
 738 }
 739
 740 /**
 741  * unregister_ftrace_event - remove a no longer used event
 742  * @event: the event to remove
 743  */
 744 int unregister_ftrace_event(struct trace_event *event)
 745 {
 746         down_write(&trace_event_mutex);
 747         __unregister_ftrace_event(event);
 748         up_write(&trace_event_mutex);
 749
 750         return 0;
 751 }
 752 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 753
 754 /*
 755  * Standard events
 756  */
 757
 758 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 759 {
 760         return TRACE_TYPE_HANDLED;
 761 }
 762
 763 /* TRACE_FN */
 764 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 765 {
 766         struct ftrace_entry *field;
 767         struct trace_seq *s = &iter->seq;
 768
 769         trace_assign_type(field, iter->ent);
 770
 771         if (!seq_print_ip_sym(s, field->ip, flags))
 772                 goto partial;
 773
 774         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 775                 if (!trace_seq_printf(s, " <-"))
 776                         goto partial;
 777                 if (!seq_print_ip_sym(s,
 778                                       field->parent_ip,
 779                                       flags))
 780                         goto partial;
 781         }
 782         if (!trace_seq_printf(s, "\n"))
 783                 goto partial;
 784
 785         return TRACE_TYPE_HANDLED;
 786
 787  partial:
 788         return TRACE_TYPE_PARTIAL_LINE;
 789 }
 790
 791 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 792 {
 793         struct ftrace_entry *field;
 794
 795         trace_assign_type(field, iter->ent);
 796
 797         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 798                               field->ip,
 799                               field->parent_ip))
 800                 return TRACE_TYPE_PARTIAL_LINE;
 801
 802         return TRACE_TYPE_HANDLED;
 803 }
 804
 805 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 806 {
 807         struct ftrace_entry *field;
 808         struct trace_seq *s = &iter->seq;
 809
 810         trace_assign_type(field, iter->ent);
 811
 812         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 813         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 814
 815         return TRACE_TYPE_HANDLED;
 816 }
 817
 818 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 819 {
 820         struct ftrace_entry *field;
 821         struct trace_seq *s = &iter->seq;
 822
 823         trace_assign_type(field, iter->ent);
 824
 825         SEQ_PUT_FIELD_RET(s, field->ip);
 826         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 827
 828         return TRACE_TYPE_HANDLED;
 829 }
 830
 831 static struct trace_event trace_fn_event = {
 832         .type           = TRACE_FN,
 833         .trace          = trace_fn_trace,
 834         .raw            = trace_fn_raw,
 835         .hex            = trace_fn_hex,
 836         .binary         = trace_fn_bin,
 837 };
 838
 839 /* TRACE_CTX an TRACE_WAKE */
 840 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 841                                              char *delim)
 842 {
 843         struct ctx_switch_entry *field;
 844         char comm[TASK_COMM_LEN];
 845         int S, T;
 846
 847
 848         trace_assign_type(field, iter->ent);
 849
 850         T = task_state_char(field->next_state);
 851         S = task_state_char(field->prev_state);
 852         trace_find_cmdline(field->next_pid, comm);
 853         if (!trace_seq_printf(&iter->seq,
 854                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 855                               field->prev_pid,
 856                               field->prev_prio,
 857                               S, delim,
 858                               field->next_cpu,
 859                               field->next_pid,
 860                               field->next_prio,
 861                               T, comm))
 862                 return TRACE_TYPE_PARTIAL_LINE;
 863
 864         return TRACE_TYPE_HANDLED;
 865 }
 866
 867 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 868 {
 869         return trace_ctxwake_print(iter, "==>");
 870 }
 871
 872 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 873                                           int flags)
 874 {
 875         return trace_ctxwake_print(iter, "  +");
 876 }
 877
 878 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 879 {
 880         struct ctx_switch_entry *field;
 881         int T;
 882
 883         trace_assign_type(field, iter->ent);
 884
 885         if (!S)
 886                 task_state_char(field->prev_state);
 887         T = task_state_char(field->next_state);
 888         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 889                               field->prev_pid,
 890                               field->prev_prio,
 891                               S,
 892                               field->next_cpu,
 893                               field->next_pid,
 894                               field->next_prio,
 895                               T))
 896                 return TRACE_TYPE_PARTIAL_LINE;
 897
 898         return TRACE_TYPE_HANDLED;
 899 }
 900
 901 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 902 {
 903         return trace_ctxwake_raw(iter, 0);
 904 }
 905
 906 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 907 {
 908         return trace_ctxwake_raw(iter, '+');
 909 }
 910
 911
 912 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 913 {
 914         struct ctx_switch_entry *field;
 915         struct trace_seq *s = &iter->seq;
 916         int T;
 917
 918         trace_assign_type(field, iter->ent);
 919
 920         if (!S)
 921                 task_state_char(field->prev_state);
 922         T = task_state_char(field->next_state);
 923
 924         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 925         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 926         SEQ_PUT_HEX_FIELD_RET(s, S);
 927         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 928         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 929         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 930         SEQ_PUT_HEX_FIELD_RET(s, T);
 931
 932         return TRACE_TYPE_HANDLED;
 933 }
 934
 935 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 936 {
 937         return trace_ctxwake_hex(iter, 0);
 938 }
 939
 940 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 941 {
 942         return trace_ctxwake_hex(iter, '+');
 943 }
 944
 945 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 946                                            int flags)
 947 {
 948         struct ctx_switch_entry *field;
 949         struct trace_seq *s = &iter->seq;
 950
 951         trace_assign_type(field, iter->ent);
 952
 953         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 954         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 955         SEQ_PUT_FIELD_RET(s, field->prev_state);
 956         SEQ_PUT_FIELD_RET(s, field->next_pid);
 957         SEQ_PUT_FIELD_RET(s, field->next_prio);
 958         SEQ_PUT_FIELD_RET(s, field->next_state);
 959
 960         return TRACE_TYPE_HANDLED;
 961 }
 962
 963 static struct trace_event trace_ctx_event = {
 964         .type           = TRACE_CTX,
 965         .trace          = trace_ctx_print,
 966         .raw            = trace_ctx_raw,
 967         .hex            = trace_ctx_hex,
 968         .binary         = trace_ctxwake_bin,
 969 };
 970
 971 static struct trace_event trace_wake_event = {
 972         .type           = TRACE_WAKE,
 973         .trace          = trace_wake_print,
 974         .raw            = trace_wake_raw,
 975         .hex            = trace_wake_hex,
 976         .binary         = trace_ctxwake_bin,
 977 };
 978
 979 /* TRACE_SPECIAL */
 980 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 981                                              int flags)
 982 {
 983         struct special_entry *field;
 984
 985         trace_assign_type(field, iter->ent);
 986
 987         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 988                               field->arg1,
 989                               field->arg2,
 990                               field->arg3))
 991                 return TRACE_TYPE_PARTIAL_LINE;
 992
 993         return TRACE_TYPE_HANDLED;
 994 }
 995
 996 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 997                                            int flags)
 998 {
 999         struct special_entry *field;
1000         struct trace_seq *s = &iter->seq;
1001
1002         trace_assign_type(field, iter->ent);
1003
1004         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1005         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1006         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1007
1008         return TRACE_TYPE_HANDLED;
1009 }
1010
1011 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1012                                            int flags)
1013 {
1014         struct special_entry *field;
1015         struct trace_seq *s = &iter->seq;
1016
1017         trace_assign_type(field, iter->ent);
1018
1019         SEQ_PUT_FIELD_RET(s, field->arg1);
1020         SEQ_PUT_FIELD_RET(s, field->arg2);
1021         SEQ_PUT_FIELD_RET(s, field->arg3);
1022
1023         return TRACE_TYPE_HANDLED;
1024 }
1025
1026 static struct trace_event trace_special_event = {
1027         .type           = TRACE_SPECIAL,
1028         .trace          = trace_special_print,
1029         .raw            = trace_special_print,
1030         .hex            = trace_special_hex,
1031         .binary         = trace_special_bin,
1032 };
1033
1034 /* TRACE_STACK */
1035
1036 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1037                                            int flags)
1038 {
1039         struct stack_entry *field;
1040         struct trace_seq *s = &iter->seq;
1041         int i;
1042
1043         trace_assign_type(field, iter->ent);
1044
1045         if (!trace_seq_puts(s, "<stack trace>\n"))
1046                 goto partial;
1047         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1048                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1049                         break;
1050                 if (!trace_seq_puts(s, " => "))
1051                         goto partial;
1052
1053                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1054                         goto partial;
1055                 if (!trace_seq_puts(s, "\n"))
1056                         goto partial;
1057         }
1058
1059         return TRACE_TYPE_HANDLED;
1060
1061  partial:
1062         return TRACE_TYPE_PARTIAL_LINE;
1063 }
1064
1065 static struct trace_event trace_stack_event = {
1066         .type           = TRACE_STACK,
1067         .trace          = trace_stack_print,
1068         .raw            = trace_special_print,
1069         .hex            = trace_special_hex,
1070         .binary         = trace_special_bin,
1071 };
1072
1073 /* TRACE_USER_STACK */
1074 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1075                                                 int flags)
1076 {
1077         struct userstack_entry *field;
1078         struct trace_seq *s = &iter->seq;
1079
1080         trace_assign_type(field, iter->ent);
1081
1082         if (!trace_seq_puts(s, "<user stack trace>\n"))
1083                 goto partial;
1084
1085         if (!seq_print_userip_objs(field, s, flags))
1086                 goto partial;
1087
1088         return TRACE_TYPE_HANDLED;
1089
1090  partial:
1091         return TRACE_TYPE_PARTIAL_LINE;
1092 }
1093
1094 static struct trace_event trace_user_stack_event = {
1095         .type           = TRACE_USER_STACK,
1096         .trace          = trace_user_stack_print,
1097         .raw            = trace_special_print,
1098         .hex            = trace_special_hex,
1099         .binary         = trace_special_bin,
1100 };
1101
1102 /* TRACE_BPRINT */
1103 static enum print_line_t
1104 trace_bprint_print(struct trace_iterator *iter, int flags)
1105 {
1106         struct trace_entry *entry = iter->ent;
1107         struct trace_seq *s = &iter->seq;
1108         struct bprint_entry *field;
1109
1110         trace_assign_type(field, entry);
1111
1112         if (!seq_print_ip_sym(s, field->ip, flags))
1113                 goto partial;
1114
1115         if (!trace_seq_puts(s, ": "))
1116                 goto partial;
1117
1118         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1119                 goto partial;
1120
1121         return TRACE_TYPE_HANDLED;
1122
1123  partial:
1124         return TRACE_TYPE_PARTIAL_LINE;
1125 }
1126
1127
1128 static enum print_line_t
1129 trace_bprint_raw(struct trace_iterator *iter, int flags)
1130 {
1131         struct bprint_entry *field;
1132         struct trace_seq *s = &iter->seq;
1133
1134         trace_assign_type(field, iter->ent);
1135
1136         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1137                 goto partial;
1138
1139         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1140                 goto partial;
1141
1142         return TRACE_TYPE_HANDLED;
1143
1144  partial:
1145         return TRACE_TYPE_PARTIAL_LINE;
1146 }
1147
1148
1149 static struct trace_event trace_bprint_event = {
1150         .type           = TRACE_BPRINT,
1151         .trace          = trace_bprint_print,
1152         .raw            = trace_bprint_raw,
1153 };
1154
1155 /* TRACE_PRINT */
1156 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1157                                            int flags)
1158 {
1159         struct print_entry *field;
1160         struct trace_seq *s = &iter->seq;
1161
1162         trace_assign_type(field, iter->ent);
1163
1164         if (!seq_print_ip_sym(s, field->ip, flags))
1165                 goto partial;
1166
1167         if (!trace_seq_printf(s, ": %s", field->buf))
1168                 goto partial;
1169
1170         return TRACE_TYPE_HANDLED;
1171
1172  partial:
1173         return TRACE_TYPE_PARTIAL_LINE;
1174 }
1175
1176 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1177 {
1178         struct print_entry *field;
1179
1180         trace_assign_type(field, iter->ent);
1181
1182         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1183                 goto partial;
1184
1185         return TRACE_TYPE_HANDLED;
1186
1187  partial:
1188         return TRACE_TYPE_PARTIAL_LINE;
1189 }
1190
1191 static struct trace_event trace_print_event = {
1192         .type           = TRACE_PRINT,
1193         .trace          = trace_print_print,
1194         .raw            = trace_print_raw,
1195 };
1196
1197
1198 static struct trace_event *events[] __initdata = {
1199         &trace_fn_event,
1200         &trace_ctx_event,
1201         &trace_wake_event,
1202         &trace_special_event,
1203         &trace_stack_event,
1204         &trace_user_stack_event,
1205         &trace_bprint_event,
1206         &trace_print_event,
1207         NULL
1208 };
1209
1210 __init static int init_events(void)
1211 {
1212         struct trace_event *event;
1213         int i, ret;
1214
1215         for (i = 0; events[i]; i++) {
1216                 event = events[i];
1217
1218                 ret = register_ftrace_event(event);
1219                 if (!ret) {
1220                         printk(KERN_WARNING "event %d failed to register\n",
1221                                event->type);
1222                         WARN_ON_ONCE(1);
1223                 }
1224         }
1225
1226         return 0;
1227 }
1228 device_initcall(init_events);