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   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  * It returns 0 if the trace oversizes the buffer's free
  73  * space, 1 otherwise.
  74  *
  75  * The tracer may use either sequence operations or its own
  76  * copy to user routines. To simplify formating of a trace
  77  * trace_seq_printf is used to store strings into a special
  78  * buffer (@s). Then the output may be either used by
  79  * the sequencer or pulled into another buffer.
  80  */
  81 int
  82 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  83 {
  84         int len = (PAGE_SIZE - 1) - s->len;
  85         va_list ap;
  86         int ret;
  87
  88         if (!len)
  89                 return 0;
  90
  91         va_start(ap, fmt);
  92         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  93         va_end(ap);
  94
  95         /* If we can't write it all, don't bother writing anything */
  96         if (ret >= len)
  97                 return 0;
  98
  99         s->len += ret;
 100
 101         return 1;
 102 }
 103 EXPORT_SYMBOL_GPL(trace_seq_printf);
 104
 105 /**
 106  * trace_seq_vprintf - sequence printing of trace information
 107  * @s: trace sequence descriptor
 108  * @fmt: printf format string
 109  *
 110  * The tracer may use either sequence operations or its own
 111  * copy to user routines. To simplify formating of a trace
 112  * trace_seq_printf is used to store strings into a special
 113  * buffer (@s). Then the output may be either used by
 114  * the sequencer or pulled into another buffer.
 115  */
 116 int
 117 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 118 {
 119         int len = (PAGE_SIZE - 1) - s->len;
 120         int ret;
 121
 122         if (!len)
 123                 return 0;
 124
 125         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 126
 127         /* If we can't write it all, don't bother writing anything */
 128         if (ret >= len)
 129                 return 0;
 130
 131         s->len += ret;
 132
 133         return len;
 134 }
 135 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 136
 137 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 138 {
 139         int len = (PAGE_SIZE - 1) - s->len;
 140         int ret;
 141
 142         if (!len)
 143                 return 0;
 144
 145         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 146
 147         /* If we can't write it all, don't bother writing anything */
 148         if (ret >= len)
 149                 return 0;
 150
 151         s->len += ret;
 152
 153         return len;
 154 }
 155
 156 /**
 157  * trace_seq_puts - trace sequence printing of simple string
 158  * @s: trace sequence descriptor
 159  * @str: simple string to record
 160  *
 161  * The tracer may use either the sequence operations or its own
 162  * copy to user routines. This function records a simple string
 163  * into a special buffer (@s) for later retrieval by a sequencer
 164  * or other mechanism.
 165  */
 166 int trace_seq_puts(struct trace_seq *s, const char *str)
 167 {
 168         int len = strlen(str);
 169
 170         if (len > ((PAGE_SIZE - 1) - s->len))
 171                 return 0;
 172
 173         memcpy(s->buffer + s->len, str, len);
 174         s->len += len;
 175
 176         return len;
 177 }
 178
 179 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 180 {
 181         if (s->len >= (PAGE_SIZE - 1))
 182                 return 0;
 183
 184         s->buffer[s->len++] = c;
 185
 186         return 1;
 187 }
 188
 189 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 190 {
 191         if (len > ((PAGE_SIZE - 1) - s->len))
 192                 return 0;
 193
 194         memcpy(s->buffer + s->len, mem, len);
 195         s->len += len;
 196
 197         return len;
 198 }
 199
 200 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 201 {
 202         unsigned char hex[HEX_CHARS];
 203         const unsigned char *data = mem;
 204         int i, j;
 205
 206 #ifdef __BIG_ENDIAN
 207         for (i = 0, j = 0; i < len; i++) {
 208 #else
 209         for (i = len-1, j = 0; i >= 0; i--) {
 210 #endif
 211                 hex[j++] = hex_asc_hi(data[i]);
 212                 hex[j++] = hex_asc_lo(data[i]);
 213         }
 214         hex[j++] = ' ';
 215
 216         return trace_seq_putmem(s, hex, j);
 217 }
 218
 219 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 220 {
 221         void *ret;
 222
 223         if (len > ((PAGE_SIZE - 1) - s->len))
 224                 return NULL;
 225
 226         ret = s->buffer + s->len;
 227         s->len += len;
 228
 229         return ret;
 230 }
 231
 232 int trace_seq_path(struct trace_seq *s, struct path *path)
 233 {
 234         unsigned char *p;
 235
 236         if (s->len >= (PAGE_SIZE - 1))
 237                 return 0;
 238         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 239         if (!IS_ERR(p)) {
 240                 p = mangle_path(s->buffer + s->len, p, "\n");
 241                 if (p) {
 242                         s->len = p - s->buffer;
 243                         return 1;
 244                 }
 245         } else {
 246                 s->buffer[s->len++] = '?';
 247                 return 1;
 248         }
 249
 250         return 0;
 251 }
 252
 253 const char *
 254 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 255                        unsigned long flags,
 256                        const struct trace_print_flags *flag_array)
 257 {
 258         unsigned long mask;
 259         const char *str;
 260         const char *ret = p->buffer + p->len;
 261         int i;
 262
 263         for (i = 0;  flag_array[i].name && flags; i++) {
 264
 265                 mask = flag_array[i].mask;
 266                 if ((flags & mask) != mask)
 267                         continue;
 268
 269                 str = flag_array[i].name;
 270                 flags &= ~mask;
 271                 if (p->len && delim)
 272                         trace_seq_puts(p, delim);
 273                 trace_seq_puts(p, str);
 274         }
 275
 276         /* check for left over flags */
 277         if (flags) {
 278                 if (p->len && delim)
 279                         trace_seq_puts(p, delim);
 280                 trace_seq_printf(p, "0x%lx", flags);
 281         }
 282
 283         trace_seq_putc(p, 0);
 284
 285         return ret;
 286 }
 287 EXPORT_SYMBOL(ftrace_print_flags_seq);
 288
 289 const char *
 290 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 291                          const struct trace_print_flags *symbol_array)
 292 {
 293         int i;
 294         const char *ret = p->buffer + p->len;
 295
 296         for (i = 0;  symbol_array[i].name; i++) {
 297
 298                 if (val != symbol_array[i].mask)
 299                         continue;
 300
 301                 trace_seq_puts(p, symbol_array[i].name);
 302                 break;
 303         }
 304
 305         if (!p->len)
 306                 trace_seq_printf(p, "0x%lx", val);
 307
 308         trace_seq_putc(p, 0);
 309
 310         return ret;
 311 }
 312 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 313
 314 #ifdef CONFIG_KRETPROBES
 315 static inline const char *kretprobed(const char *name)
 316 {
 317         static const char tramp_name[] = "kretprobe_trampoline";
 318         int size = sizeof(tramp_name);
 319
 320         if (strncmp(tramp_name, name, size) == 0)
 321                 return "[unknown/kretprobe'd]";
 322         return name;
 323 }
 324 #else
 325 static inline const char *kretprobed(const char *name)
 326 {
 327         return name;
 328 }
 329 #endif /* CONFIG_KRETPROBES */
 330
 331 static int
 332 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 333 {
 334 #ifdef CONFIG_KALLSYMS
 335         char str[KSYM_SYMBOL_LEN];
 336         const char *name;
 337
 338         kallsyms_lookup(address, NULL, NULL, NULL, str);
 339
 340         name = kretprobed(str);
 341
 342         return trace_seq_printf(s, fmt, name);
 343 #endif
 344         return 1;
 345 }
 346
 347 static int
 348 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 349                      unsigned long address)
 350 {
 351 #ifdef CONFIG_KALLSYMS
 352         char str[KSYM_SYMBOL_LEN];
 353         const char *name;
 354
 355         sprint_symbol(str, address);
 356         name = kretprobed(str);
 357
 358         return trace_seq_printf(s, fmt, name);
 359 #endif
 360         return 1;
 361 }
 362
 363 #ifndef CONFIG_64BIT
 364 # define IP_FMT "%08lx"
 365 #else
 366 # define IP_FMT "%016lx"
 367 #endif
 368
 369 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 370                       unsigned long ip, unsigned long sym_flags)
 371 {
 372         struct file *file = NULL;
 373         unsigned long vmstart = 0;
 374         int ret = 1;
 375
 376         if (mm) {
 377                 const struct vm_area_struct *vma;
 378
 379                 down_read(&mm->mmap_sem);
 380                 vma = find_vma(mm, ip);
 381                 if (vma) {
 382                         file = vma->vm_file;
 383                         vmstart = vma->vm_start;
 384                 }
 385                 if (file) {
 386                         ret = trace_seq_path(s, &file->f_path);
 387                         if (ret)
 388                                 ret = trace_seq_printf(s, "[+0x%lx]",
 389                                                        ip - vmstart);
 390                 }
 391                 up_read(&mm->mmap_sem);
 392         }
 393         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 394                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 395         return ret;
 396 }
 397
 398 int
 399 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 400                       unsigned long sym_flags)
 401 {
 402         struct mm_struct *mm = NULL;
 403         int ret = 1;
 404         unsigned int i;
 405
 406         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 407                 struct task_struct *task;
 408                 /*
 409                  * we do the lookup on the thread group leader,
 410                  * since individual threads might have already quit!
 411                  */
 412                 rcu_read_lock();
 413                 task = find_task_by_vpid(entry->tgid);
 414                 if (task)
 415                         mm = get_task_mm(task);
 416                 rcu_read_unlock();
 417         }
 418
 419         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 420                 unsigned long ip = entry->caller[i];
 421
 422                 if (ip == ULONG_MAX || !ret)
 423                         break;
 424                 if (ret)
 425                         ret = trace_seq_puts(s, " => ");
 426                 if (!ip) {
 427                         if (ret)
 428                                 ret = trace_seq_puts(s, "??");
 429                         if (ret)
 430                                 ret = trace_seq_puts(s, "\n");
 431                         continue;
 432                 }
 433                 if (!ret)
 434                         break;
 435                 if (ret)
 436                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 437                 ret = trace_seq_puts(s, "\n");
 438         }
 439
 440         if (mm)
 441                 mmput(mm);
 442         return ret;
 443 }
 444
 445 int
 446 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 447 {
 448         int ret;
 449
 450         if (!ip)
 451                 return trace_seq_printf(s, "0");
 452
 453         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 454                 ret = seq_print_sym_offset(s, "%s", ip);
 455         else
 456                 ret = seq_print_sym_short(s, "%s", ip);
 457
 458         if (!ret)
 459                 return 0;
 460
 461         if (sym_flags & TRACE_ITER_SYM_ADDR)
 462                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 463         return ret;
 464 }
 465
 466 /**
 467  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 468  * @s: trace seq struct to write to
 469  * @entry: The trace entry field from the ring buffer
 470  *
 471  * Prints the generic fields of irqs off, in hard or softirq, preempt
 472  * count and lock depth.
 473  */
 474 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 475 {
 476         int hardirq, softirq;
 477         int ret;
 478
 479         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 480         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 481
 482         if (!trace_seq_printf(s, "%c%c%c",
 483                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 484                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 485                                   'X' : '.',
 486                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 487                                 'N' : '.',
 488                               (hardirq && softirq) ? 'H' :
 489                                 hardirq ? 'h' : softirq ? 's' : '.'))
 490                 return 0;
 491
 492         if (entry->preempt_count)
 493                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
 494         else
 495                 ret = trace_seq_putc(s, '.');
 496
 497         if (!ret)
 498                 return 0;
 499
 500         if (entry->lock_depth < 0)
 501                 return trace_seq_putc(s, '.');
 502
 503         return trace_seq_printf(s, "%d", entry->lock_depth);
 504 }
 505
 506 static int
 507 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 508 {
 509         char comm[TASK_COMM_LEN];
 510
 511         trace_find_cmdline(entry->pid, comm);
 512
 513         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 514                               comm, entry->pid, cpu))
 515                 return 0;
 516
 517         return trace_print_lat_fmt(s, entry);
 518 }
 519
 520 static unsigned long preempt_mark_thresh = 100;
 521
 522 static int
 523 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 524                     unsigned long rel_usecs)
 525 {
 526         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 527                                 rel_usecs > preempt_mark_thresh ? '!' :
 528                                   rel_usecs > 1 ? '+' : ' ');
 529 }
 530
 531 int trace_print_context(struct trace_iterator *iter)
 532 {
 533         struct trace_seq *s = &iter->seq;
 534         struct trace_entry *entry = iter->ent;
 535         unsigned long long t = ns2usecs(iter->ts);
 536         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 537         unsigned long secs = (unsigned long)t;
 538         char comm[TASK_COMM_LEN];
 539
 540         trace_find_cmdline(entry->pid, comm);
 541
 542         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 543                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 544 }
 545
 546 int trace_print_lat_context(struct trace_iterator *iter)
 547 {
 548         u64 next_ts;
 549         int ret;
 550         struct trace_seq *s = &iter->seq;
 551         struct trace_entry *entry = iter->ent,
 552                            *next_entry = trace_find_next_entry(iter, NULL,
 553                                                                &next_ts);
 554         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 555         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 556         unsigned long rel_usecs;
 557
 558         if (!next_entry)
 559                 next_ts = iter->ts;
 560         rel_usecs = ns2usecs(next_ts - iter->ts);
 561
 562         if (verbose) {
 563                 char comm[TASK_COMM_LEN];
 564
 565                 trace_find_cmdline(entry->pid, comm);
 566
 567                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 568                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 569                                        entry->pid, iter->cpu, entry->flags,
 570                                        entry->preempt_count, iter->idx,
 571                                        ns2usecs(iter->ts),
 572                                        abs_usecs / USEC_PER_MSEC,
 573                                        abs_usecs % USEC_PER_MSEC,
 574                                        rel_usecs / USEC_PER_MSEC,
 575                                        rel_usecs % USEC_PER_MSEC);
 576         } else {
 577                 ret = lat_print_generic(s, entry, iter->cpu);
 578                 if (ret)
 579                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 580         }
 581
 582         return ret;
 583 }
 584
 585 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 586
 587 static int task_state_char(unsigned long state)
 588 {
 589         int bit = state ? __ffs(state) + 1 : 0;
 590
 591         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 592 }
 593
 594 /**
 595  * ftrace_find_event - find a registered event
 596  * @type: the type of event to look for
 597  *
 598  * Returns an event of type @type otherwise NULL
 599  * Called with trace_event_read_lock() held.
 600  */
 601 struct trace_event *ftrace_find_event(int type)
 602 {
 603         struct trace_event *event;
 604         struct hlist_node *n;
 605         unsigned key;
 606
 607         key = type & (EVENT_HASHSIZE - 1);
 608
 609         hlist_for_each_entry(event, n, &event_hash[key], node) {
 610                 if (event->type == type)
 611                         return event;
 612         }
 613
 614         return NULL;
 615 }
 616
 617 static LIST_HEAD(ftrace_event_list);
 618
 619 static int trace_search_list(struct list_head **list)
 620 {
 621         struct trace_event *e;
 622         int last = __TRACE_LAST_TYPE;
 623
 624         if (list_empty(&ftrace_event_list)) {
 625                 *list = &ftrace_event_list;
 626                 return last + 1;
 627         }
 628
 629         /*
 630          * We used up all possible max events,
 631          * lets see if somebody freed one.
 632          */
 633         list_for_each_entry(e, &ftrace_event_list, list) {
 634                 if (e->type != last + 1)
 635                         break;
 636                 last++;
 637         }
 638
 639         /* Did we used up all 65 thousand events??? */
 640         if ((last + 1) > FTRACE_MAX_EVENT)
 641                 return 0;
 642
 643         *list = &e->list;
 644         return last + 1;
 645 }
 646
 647 void trace_event_read_lock(void)
 648 {
 649         down_read(&trace_event_mutex);
 650 }
 651
 652 void trace_event_read_unlock(void)
 653 {
 654         up_read(&trace_event_mutex);
 655 }
 656
 657 /**
 658  * register_ftrace_event - register output for an event type
 659  * @event: the event type to register
 660  *
 661  * Event types are stored in a hash and this hash is used to
 662  * find a way to print an event. If the @event->type is set
 663  * then it will use that type, otherwise it will assign a
 664  * type to use.
 665  *
 666  * If you assign your own type, please make sure it is added
 667  * to the trace_type enum in trace.h, to avoid collisions
 668  * with the dynamic types.
 669  *
 670  * Returns the event type number or zero on error.
 671  */
 672 int register_ftrace_event(struct trace_event *event)
 673 {
 674         unsigned key;
 675         int ret = 0;
 676
 677         down_write(&trace_event_mutex);
 678
 679         if (WARN_ON(!event))
 680                 goto out;
 681
 682         INIT_LIST_HEAD(&event->list);
 683
 684         if (!event->type) {
 685                 struct list_head *list = NULL;
 686
 687                 if (next_event_type > FTRACE_MAX_EVENT) {
 688
 689                         event->type = trace_search_list(&list);
 690                         if (!event->type)
 691                                 goto out;
 692
 693                 } else {
 694
 695                         event->type = next_event_type++;
 696                         list = &ftrace_event_list;
 697                 }
 698
 699                 if (WARN_ON(ftrace_find_event(event->type)))
 700                         goto out;
 701
 702                 list_add_tail(&event->list, list);
 703
 704         } else if (event->type > __TRACE_LAST_TYPE) {
 705                 printk(KERN_WARNING "Need to add type to trace.h\n");
 706                 WARN_ON(1);
 707                 goto out;
 708         } else {
 709                 /* Is this event already used */
 710                 if (ftrace_find_event(event->type))
 711                         goto out;
 712         }
 713
 714         if (event->trace == NULL)
 715                 event->trace = trace_nop_print;
 716         if (event->raw == NULL)
 717                 event->raw = trace_nop_print;
 718         if (event->hex == NULL)
 719                 event->hex = trace_nop_print;
 720         if (event->binary == NULL)
 721                 event->binary = trace_nop_print;
 722
 723         key = event->type & (EVENT_HASHSIZE - 1);
 724
 725         hlist_add_head(&event->node, &event_hash[key]);
 726
 727         ret = event->type;
 728  out:
 729         up_write(&trace_event_mutex);
 730
 731         return ret;
 732 }
 733 EXPORT_SYMBOL_GPL(register_ftrace_event);
 734
 735 /*
 736  * Used by module code with the trace_event_mutex held for write.
 737  */
 738 int __unregister_ftrace_event(struct trace_event *event)
 739 {
 740         hlist_del(&event->node);
 741         list_del(&event->list);
 742         return 0;
 743 }
 744
 745 /**
 746  * unregister_ftrace_event - remove a no longer used event
 747  * @event: the event to remove
 748  */
 749 int unregister_ftrace_event(struct trace_event *event)
 750 {
 751         down_write(&trace_event_mutex);
 752         __unregister_ftrace_event(event);
 753         up_write(&trace_event_mutex);
 754
 755         return 0;
 756 }
 757 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 758
 759 /*
 760  * Standard events
 761  */
 762
 763 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 764 {
 765         return TRACE_TYPE_HANDLED;
 766 }
 767
 768 /* TRACE_FN */
 769 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 770 {
 771         struct ftrace_entry *field;
 772         struct trace_seq *s = &iter->seq;
 773
 774         trace_assign_type(field, iter->ent);
 775
 776         if (!seq_print_ip_sym(s, field->ip, flags))
 777                 goto partial;
 778
 779         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 780                 if (!trace_seq_printf(s, " <-"))
 781                         goto partial;
 782                 if (!seq_print_ip_sym(s,
 783                                       field->parent_ip,
 784                                       flags))
 785                         goto partial;
 786         }
 787         if (!trace_seq_printf(s, "\n"))
 788                 goto partial;
 789
 790         return TRACE_TYPE_HANDLED;
 791
 792  partial:
 793         return TRACE_TYPE_PARTIAL_LINE;
 794 }
 795
 796 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 797 {
 798         struct ftrace_entry *field;
 799
 800         trace_assign_type(field, iter->ent);
 801
 802         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 803                               field->ip,
 804                               field->parent_ip))
 805                 return TRACE_TYPE_PARTIAL_LINE;
 806
 807         return TRACE_TYPE_HANDLED;
 808 }
 809
 810 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 811 {
 812         struct ftrace_entry *field;
 813         struct trace_seq *s = &iter->seq;
 814
 815         trace_assign_type(field, iter->ent);
 816
 817         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 818         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 819
 820         return TRACE_TYPE_HANDLED;
 821 }
 822
 823 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 824 {
 825         struct ftrace_entry *field;
 826         struct trace_seq *s = &iter->seq;
 827
 828         trace_assign_type(field, iter->ent);
 829
 830         SEQ_PUT_FIELD_RET(s, field->ip);
 831         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 832
 833         return TRACE_TYPE_HANDLED;
 834 }
 835
 836 static struct trace_event trace_fn_event = {
 837         .type           = TRACE_FN,
 838         .trace          = trace_fn_trace,
 839         .raw            = trace_fn_raw,
 840         .hex            = trace_fn_hex,
 841         .binary         = trace_fn_bin,
 842 };
 843
 844 /* TRACE_CTX an TRACE_WAKE */
 845 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 846                                              char *delim)
 847 {
 848         struct ctx_switch_entry *field;
 849         char comm[TASK_COMM_LEN];
 850         int S, T;
 851
 852
 853         trace_assign_type(field, iter->ent);
 854
 855         T = task_state_char(field->next_state);
 856         S = task_state_char(field->prev_state);
 857         trace_find_cmdline(field->next_pid, comm);
 858         if (!trace_seq_printf(&iter->seq,
 859                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 860                               field->prev_pid,
 861                               field->prev_prio,
 862                               S, delim,
 863                               field->next_cpu,
 864                               field->next_pid,
 865                               field->next_prio,
 866                               T, comm))
 867                 return TRACE_TYPE_PARTIAL_LINE;
 868
 869         return TRACE_TYPE_HANDLED;
 870 }
 871
 872 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 873 {
 874         return trace_ctxwake_print(iter, "==>");
 875 }
 876
 877 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 878                                           int flags)
 879 {
 880         return trace_ctxwake_print(iter, "  +");
 881 }
 882
 883 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 884 {
 885         struct ctx_switch_entry *field;
 886         int T;
 887
 888         trace_assign_type(field, iter->ent);
 889
 890         if (!S)
 891                 S = task_state_char(field->prev_state);
 892         T = task_state_char(field->next_state);
 893         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 894                               field->prev_pid,
 895                               field->prev_prio,
 896                               S,
 897                               field->next_cpu,
 898                               field->next_pid,
 899                               field->next_prio,
 900                               T))
 901                 return TRACE_TYPE_PARTIAL_LINE;
 902
 903         return TRACE_TYPE_HANDLED;
 904 }
 905
 906 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 907 {
 908         return trace_ctxwake_raw(iter, 0);
 909 }
 910
 911 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 912 {
 913         return trace_ctxwake_raw(iter, '+');
 914 }
 915
 916
 917 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 918 {
 919         struct ctx_switch_entry *field;
 920         struct trace_seq *s = &iter->seq;
 921         int T;
 922
 923         trace_assign_type(field, iter->ent);
 924
 925         if (!S)
 926                 S = task_state_char(field->prev_state);
 927         T = task_state_char(field->next_state);
 928
 929         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 930         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 931         SEQ_PUT_HEX_FIELD_RET(s, S);
 932         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 933         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 934         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 935         SEQ_PUT_HEX_FIELD_RET(s, T);
 936
 937         return TRACE_TYPE_HANDLED;
 938 }
 939
 940 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 941 {
 942         return trace_ctxwake_hex(iter, 0);
 943 }
 944
 945 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 946 {
 947         return trace_ctxwake_hex(iter, '+');
 948 }
 949
 950 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 951                                            int flags)
 952 {
 953         struct ctx_switch_entry *field;
 954         struct trace_seq *s = &iter->seq;
 955
 956         trace_assign_type(field, iter->ent);
 957
 958         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 959         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 960         SEQ_PUT_FIELD_RET(s, field->prev_state);
 961         SEQ_PUT_FIELD_RET(s, field->next_pid);
 962         SEQ_PUT_FIELD_RET(s, field->next_prio);
 963         SEQ_PUT_FIELD_RET(s, field->next_state);
 964
 965         return TRACE_TYPE_HANDLED;
 966 }
 967
 968 static struct trace_event trace_ctx_event = {
 969         .type           = TRACE_CTX,
 970         .trace          = trace_ctx_print,
 971         .raw            = trace_ctx_raw,
 972         .hex            = trace_ctx_hex,
 973         .binary         = trace_ctxwake_bin,
 974 };
 975
 976 static struct trace_event trace_wake_event = {
 977         .type           = TRACE_WAKE,
 978         .trace          = trace_wake_print,
 979         .raw            = trace_wake_raw,
 980         .hex            = trace_wake_hex,
 981         .binary         = trace_ctxwake_bin,
 982 };
 983
 984 /* TRACE_SPECIAL */
 985 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 986                                              int flags)
 987 {
 988         struct special_entry *field;
 989
 990         trace_assign_type(field, iter->ent);
 991
 992         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 993                               field->arg1,
 994                               field->arg2,
 995                               field->arg3))
 996                 return TRACE_TYPE_PARTIAL_LINE;
 997
 998         return TRACE_TYPE_HANDLED;
 999 }
1000
1001 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
1002                                            int flags)
1003 {
1004         struct special_entry *field;
1005         struct trace_seq *s = &iter->seq;
1006
1007         trace_assign_type(field, iter->ent);
1008
1009         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1010         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1011         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1012
1013         return TRACE_TYPE_HANDLED;
1014 }
1015
1016 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1017                                            int flags)
1018 {
1019         struct special_entry *field;
1020         struct trace_seq *s = &iter->seq;
1021
1022         trace_assign_type(field, iter->ent);
1023
1024         SEQ_PUT_FIELD_RET(s, field->arg1);
1025         SEQ_PUT_FIELD_RET(s, field->arg2);
1026         SEQ_PUT_FIELD_RET(s, field->arg3);
1027
1028         return TRACE_TYPE_HANDLED;
1029 }
1030
1031 static struct trace_event trace_special_event = {
1032         .type           = TRACE_SPECIAL,
1033         .trace          = trace_special_print,
1034         .raw            = trace_special_print,
1035         .hex            = trace_special_hex,
1036         .binary         = trace_special_bin,
1037 };
1038
1039 /* TRACE_STACK */
1040
1041 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1042                                            int flags)
1043 {
1044         struct stack_entry *field;
1045         struct trace_seq *s = &iter->seq;
1046         int i;
1047
1048         trace_assign_type(field, iter->ent);
1049
1050         if (!trace_seq_puts(s, "<stack trace>\n"))
1051                 goto partial;
1052         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1053                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1054                         break;
1055                 if (!trace_seq_puts(s, " => "))
1056                         goto partial;
1057
1058                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1059                         goto partial;
1060                 if (!trace_seq_puts(s, "\n"))
1061                         goto partial;
1062         }
1063
1064         return TRACE_TYPE_HANDLED;
1065
1066  partial:
1067         return TRACE_TYPE_PARTIAL_LINE;
1068 }
1069
1070 static struct trace_event trace_stack_event = {
1071         .type           = TRACE_STACK,
1072         .trace          = trace_stack_print,
1073         .raw            = trace_special_print,
1074         .hex            = trace_special_hex,
1075         .binary         = trace_special_bin,
1076 };
1077
1078 /* TRACE_USER_STACK */
1079 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1080                                                 int flags)
1081 {
1082         struct userstack_entry *field;
1083         struct trace_seq *s = &iter->seq;
1084
1085         trace_assign_type(field, iter->ent);
1086
1087         if (!trace_seq_puts(s, "<user stack trace>\n"))
1088                 goto partial;
1089
1090         if (!seq_print_userip_objs(field, s, flags))
1091                 goto partial;
1092
1093         return TRACE_TYPE_HANDLED;
1094
1095  partial:
1096         return TRACE_TYPE_PARTIAL_LINE;
1097 }
1098
1099 static struct trace_event trace_user_stack_event = {
1100         .type           = TRACE_USER_STACK,
1101         .trace          = trace_user_stack_print,
1102         .raw            = trace_special_print,
1103         .hex            = trace_special_hex,
1104         .binary         = trace_special_bin,
1105 };
1106
1107 /* TRACE_BPRINT */
1108 static enum print_line_t
1109 trace_bprint_print(struct trace_iterator *iter, int flags)
1110 {
1111         struct trace_entry *entry = iter->ent;
1112         struct trace_seq *s = &iter->seq;
1113         struct bprint_entry *field;
1114
1115         trace_assign_type(field, entry);
1116
1117         if (!seq_print_ip_sym(s, field->ip, flags))
1118                 goto partial;
1119
1120         if (!trace_seq_puts(s, ": "))
1121                 goto partial;
1122
1123         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1124                 goto partial;
1125
1126         return TRACE_TYPE_HANDLED;
1127
1128  partial:
1129         return TRACE_TYPE_PARTIAL_LINE;
1130 }
1131
1132
1133 static enum print_line_t
1134 trace_bprint_raw(struct trace_iterator *iter, int flags)
1135 {
1136         struct bprint_entry *field;
1137         struct trace_seq *s = &iter->seq;
1138
1139         trace_assign_type(field, iter->ent);
1140
1141         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1142                 goto partial;
1143
1144         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1145                 goto partial;
1146
1147         return TRACE_TYPE_HANDLED;
1148
1149  partial:
1150         return TRACE_TYPE_PARTIAL_LINE;
1151 }
1152
1153
1154 static struct trace_event trace_bprint_event = {
1155         .type           = TRACE_BPRINT,
1156         .trace          = trace_bprint_print,
1157         .raw            = trace_bprint_raw,
1158 };
1159
1160 /* TRACE_PRINT */
1161 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1162                                            int flags)
1163 {
1164         struct print_entry *field;
1165         struct trace_seq *s = &iter->seq;
1166
1167         trace_assign_type(field, iter->ent);
1168
1169         if (!seq_print_ip_sym(s, field->ip, flags))
1170                 goto partial;
1171
1172         if (!trace_seq_printf(s, ": %s", field->buf))
1173                 goto partial;
1174
1175         return TRACE_TYPE_HANDLED;
1176
1177  partial:
1178         return TRACE_TYPE_PARTIAL_LINE;
1179 }
1180
1181 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1182 {
1183         struct print_entry *field;
1184
1185         trace_assign_type(field, iter->ent);
1186
1187         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1188                 goto partial;
1189
1190         return TRACE_TYPE_HANDLED;
1191
1192  partial:
1193         return TRACE_TYPE_PARTIAL_LINE;
1194 }
1195
1196 static struct trace_event trace_print_event = {
1197         .type           = TRACE_PRINT,
1198         .trace          = trace_print_print,
1199         .raw            = trace_print_raw,
1200 };
1201
1202
1203 static struct trace_event *events[] __initdata = {
1204         &trace_fn_event,
1205         &trace_ctx_event,
1206         &trace_wake_event,
1207         &trace_special_event,
1208         &trace_stack_event,
1209         &trace_user_stack_event,
1210         &trace_bprint_event,
1211         &trace_print_event,
1212         NULL
1213 };
1214
1215 __init static int init_events(void)
1216 {
1217         struct trace_event *event;
1218         int i, ret;
1219
1220         for (i = 0; events[i]; i++) {
1221                 event = events[i];
1222
1223                 ret = register_ftrace_event(event);
1224                 if (!ret) {
1225                         printk(KERN_WARNING "event %d failed to register\n",
1226                                event->type);
1227                         WARN_ON_ONCE(1);
1228                 }
1229         }
1230
1231         return 0;
1232 }
1233 device_initcall(init_events);