SAFE public projects git trees. - safe/jmp/linux-2.6/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 static DEFINE_MUTEX(trace_event_mutex);
  18 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  19
  20 static int next_event_type = __TRACE_LAST_TYPE + 1;
  21
  22 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  23 {
  24         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  25
  26         s->buffer[len] = 0;
  27         seq_puts(m, s->buffer);
  28
  29         trace_seq_init(s);
  30 }
  31
  32 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  33 {
  34         struct trace_seq *s = &iter->seq;
  35         struct trace_entry *entry = iter->ent;
  36         struct bprint_entry *field;
  37         int ret;
  38
  39         trace_assign_type(field, entry);
  40
  41         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  42         if (!ret)
  43                 return TRACE_TYPE_PARTIAL_LINE;
  44
  45         return TRACE_TYPE_HANDLED;
  46 }
  47
  48 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  49 {
  50         struct trace_seq *s = &iter->seq;
  51         struct trace_entry *entry = iter->ent;
  52         struct print_entry *field;
  53         int ret;
  54
  55         trace_assign_type(field, entry);
  56
  57         ret = trace_seq_printf(s, "%s", field->buf);
  58         if (!ret)
  59                 return TRACE_TYPE_PARTIAL_LINE;
  60
  61         return TRACE_TYPE_HANDLED;
  62 }
  63
  64 /**
  65  * trace_seq_printf - sequence printing of trace information
  66  * @s: trace sequence descriptor
  67  * @fmt: printf format string
  68  *
  69  * The tracer may use either sequence operations or its own
  70  * copy to user routines. To simplify formating of a trace
  71  * trace_seq_printf is used to store strings into a special
  72  * buffer (@s). Then the output may be either used by
  73  * the sequencer or pulled into another buffer.
  74  */
  75 int
  76 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  77 {
  78         int len = (PAGE_SIZE - 1) - s->len;
  79         va_list ap;
  80         int ret;
  81
  82         if (!len)
  83                 return 0;
  84
  85         va_start(ap, fmt);
  86         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  87         va_end(ap);
  88
  89         /* If we can't write it all, don't bother writing anything */
  90         if (ret >= len)
  91                 return 0;
  92
  93         s->len += ret;
  94
  95         return len;
  96 }
  97
  98 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
  99 {
 100         int len = (PAGE_SIZE - 1) - s->len;
 101         int ret;
 102
 103         if (!len)
 104                 return 0;
 105
 106         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 107
 108         /* If we can't write it all, don't bother writing anything */
 109         if (ret >= len)
 110                 return 0;
 111
 112         s->len += ret;
 113
 114         return len;
 115 }
 116
 117 /**
 118  * trace_seq_puts - trace sequence printing of simple string
 119  * @s: trace sequence descriptor
 120  * @str: simple string to record
 121  *
 122  * The tracer may use either the sequence operations or its own
 123  * copy to user routines. This function records a simple string
 124  * into a special buffer (@s) for later retrieval by a sequencer
 125  * or other mechanism.
 126  */
 127 int trace_seq_puts(struct trace_seq *s, const char *str)
 128 {
 129         int len = strlen(str);
 130
 131         if (len > ((PAGE_SIZE - 1) - s->len))
 132                 return 0;
 133
 134         memcpy(s->buffer + s->len, str, len);
 135         s->len += len;
 136
 137         return len;
 138 }
 139
 140 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 141 {
 142         if (s->len >= (PAGE_SIZE - 1))
 143                 return 0;
 144
 145         s->buffer[s->len++] = c;
 146
 147         return 1;
 148 }
 149
 150 int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
 151 {
 152         if (len > ((PAGE_SIZE - 1) - s->len))
 153                 return 0;
 154
 155         memcpy(s->buffer + s->len, mem, len);
 156         s->len += len;
 157
 158         return len;
 159 }
 160
 161 int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
 162 {
 163         unsigned char hex[HEX_CHARS];
 164         unsigned char *data = mem;
 165         int i, j;
 166
 167 #ifdef __BIG_ENDIAN
 168         for (i = 0, j = 0; i < len; i++) {
 169 #else
 170         for (i = len-1, j = 0; i >= 0; i--) {
 171 #endif
 172                 hex[j++] = hex_asc_hi(data[i]);
 173                 hex[j++] = hex_asc_lo(data[i]);
 174         }
 175         hex[j++] = ' ';
 176
 177         return trace_seq_putmem(s, hex, j);
 178 }
 179
 180 int trace_seq_path(struct trace_seq *s, struct path *path)
 181 {
 182         unsigned char *p;
 183
 184         if (s->len >= (PAGE_SIZE - 1))
 185                 return 0;
 186         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 187         if (!IS_ERR(p)) {
 188                 p = mangle_path(s->buffer + s->len, p, "\n");
 189                 if (p) {
 190                         s->len = p - s->buffer;
 191                         return 1;
 192                 }
 193         } else {
 194                 s->buffer[s->len++] = '?';
 195                 return 1;
 196         }
 197
 198         return 0;
 199 }
 200
 201 #ifdef CONFIG_KRETPROBES
 202 static inline const char *kretprobed(const char *name)
 203 {
 204         static const char tramp_name[] = "kretprobe_trampoline";
 205         int size = sizeof(tramp_name);
 206
 207         if (strncmp(tramp_name, name, size) == 0)
 208                 return "[unknown/kretprobe'd]";
 209         return name;
 210 }
 211 #else
 212 static inline const char *kretprobed(const char *name)
 213 {
 214         return name;
 215 }
 216 #endif /* CONFIG_KRETPROBES */
 217
 218 static int
 219 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 220 {
 221 #ifdef CONFIG_KALLSYMS
 222         char str[KSYM_SYMBOL_LEN];
 223         const char *name;
 224
 225         kallsyms_lookup(address, NULL, NULL, NULL, str);
 226
 227         name = kretprobed(str);
 228
 229         return trace_seq_printf(s, fmt, name);
 230 #endif
 231         return 1;
 232 }
 233
 234 static int
 235 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 236                      unsigned long address)
 237 {
 238 #ifdef CONFIG_KALLSYMS
 239         char str[KSYM_SYMBOL_LEN];
 240         const char *name;
 241
 242         sprint_symbol(str, address);
 243         name = kretprobed(str);
 244
 245         return trace_seq_printf(s, fmt, name);
 246 #endif
 247         return 1;
 248 }
 249
 250 #ifndef CONFIG_64BIT
 251 # define IP_FMT "%08lx"
 252 #else
 253 # define IP_FMT "%016lx"
 254 #endif
 255
 256 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 257                       unsigned long ip, unsigned long sym_flags)
 258 {
 259         struct file *file = NULL;
 260         unsigned long vmstart = 0;
 261         int ret = 1;
 262
 263         if (mm) {
 264                 const struct vm_area_struct *vma;
 265
 266                 down_read(&mm->mmap_sem);
 267                 vma = find_vma(mm, ip);
 268                 if (vma) {
 269                         file = vma->vm_file;
 270                         vmstart = vma->vm_start;
 271                 }
 272                 if (file) {
 273                         ret = trace_seq_path(s, &file->f_path);
 274                         if (ret)
 275                                 ret = trace_seq_printf(s, "[+0x%lx]",
 276                                                        ip - vmstart);
 277                 }
 278                 up_read(&mm->mmap_sem);
 279         }
 280         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 281                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 282         return ret;
 283 }
 284
 285 int
 286 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 287                       unsigned long sym_flags)
 288 {
 289         struct mm_struct *mm = NULL;
 290         int ret = 1;
 291         unsigned int i;
 292
 293         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 294                 struct task_struct *task;
 295                 /*
 296                  * we do the lookup on the thread group leader,
 297                  * since individual threads might have already quit!
 298                  */
 299                 rcu_read_lock();
 300                 task = find_task_by_vpid(entry->ent.tgid);
 301                 if (task)
 302                         mm = get_task_mm(task);
 303                 rcu_read_unlock();
 304         }
 305
 306         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 307                 unsigned long ip = entry->caller[i];
 308
 309                 if (ip == ULONG_MAX || !ret)
 310                         break;
 311                 if (i && ret)
 312                         ret = trace_seq_puts(s, " <- ");
 313                 if (!ip) {
 314                         if (ret)
 315                                 ret = trace_seq_puts(s, "??");
 316                         continue;
 317                 }
 318                 if (!ret)
 319                         break;
 320                 if (ret)
 321                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 322         }
 323
 324         if (mm)
 325                 mmput(mm);
 326         return ret;
 327 }
 328
 329 int
 330 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 331 {
 332         int ret;
 333
 334         if (!ip)
 335                 return trace_seq_printf(s, "0");
 336
 337         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 338                 ret = seq_print_sym_offset(s, "%s", ip);
 339         else
 340                 ret = seq_print_sym_short(s, "%s", ip);
 341
 342         if (!ret)
 343                 return 0;
 344
 345         if (sym_flags & TRACE_ITER_SYM_ADDR)
 346                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 347         return ret;
 348 }
 349
 350 static int
 351 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 352 {
 353         int hardirq, softirq;
 354         char comm[TASK_COMM_LEN];
 355
 356         trace_find_cmdline(entry->pid, comm);
 357         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 358         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 359
 360         if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
 361                               comm, entry->pid, cpu,
 362                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 363                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 364                                   'X' : '.',
 365                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 366                                 'N' : '.',
 367                               (hardirq && softirq) ? 'H' :
 368                                 hardirq ? 'h' : softirq ? 's' : '.'))
 369                 return 0;
 370
 371         if (entry->preempt_count)
 372                 return trace_seq_printf(s, "%x", entry->preempt_count);
 373         return trace_seq_puts(s, ".");
 374 }
 375
 376 static unsigned long preempt_mark_thresh = 100;
 377
 378 static int
 379 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 380                     unsigned long rel_usecs)
 381 {
 382         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 383                                 rel_usecs > preempt_mark_thresh ? '!' :
 384                                   rel_usecs > 1 ? '+' : ' ');
 385 }
 386
 387 int trace_print_context(struct trace_iterator *iter)
 388 {
 389         struct trace_seq *s = &iter->seq;
 390         struct trace_entry *entry = iter->ent;
 391         unsigned long long t = ns2usecs(iter->ts);
 392         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 393         unsigned long secs = (unsigned long)t;
 394         char comm[TASK_COMM_LEN];
 395
 396         trace_find_cmdline(entry->pid, comm);
 397
 398         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 399                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 400 }
 401
 402 int trace_print_lat_context(struct trace_iterator *iter)
 403 {
 404         u64 next_ts;
 405         int ret;
 406         struct trace_seq *s = &iter->seq;
 407         struct trace_entry *entry = iter->ent,
 408                            *next_entry = trace_find_next_entry(iter, NULL,
 409                                                                &next_ts);
 410         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 411         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 412         unsigned long rel_usecs;
 413
 414         if (!next_entry)
 415                 next_ts = iter->ts;
 416         rel_usecs = ns2usecs(next_ts - iter->ts);
 417
 418         if (verbose) {
 419                 char comm[TASK_COMM_LEN];
 420
 421                 trace_find_cmdline(entry->pid, comm);
 422
 423                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08lx]"
 424                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 425                                        entry->pid, iter->cpu, entry->flags,
 426                                        entry->preempt_count, iter->idx,
 427                                        ns2usecs(iter->ts),
 428                                        abs_usecs / USEC_PER_MSEC,
 429                                        abs_usecs % USEC_PER_MSEC,
 430                                        rel_usecs / USEC_PER_MSEC,
 431                                        rel_usecs % USEC_PER_MSEC);
 432         } else {
 433                 ret = lat_print_generic(s, entry, iter->cpu);
 434                 if (ret)
 435                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 436         }
 437
 438         return ret;
 439 }
 440
 441 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 442
 443 static int task_state_char(unsigned long state)
 444 {
 445         int bit = state ? __ffs(state) + 1 : 0;
 446
 447         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 448 }
 449
 450 /**
 451  * ftrace_find_event - find a registered event
 452  * @type: the type of event to look for
 453  *
 454  * Returns an event of type @type otherwise NULL
 455  */
 456 struct trace_event *ftrace_find_event(int type)
 457 {
 458         struct trace_event *event;
 459         struct hlist_node *n;
 460         unsigned key;
 461
 462         key = type & (EVENT_HASHSIZE - 1);
 463
 464         hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
 465                 if (event->type == type)
 466                         return event;
 467         }
 468
 469         return NULL;
 470 }
 471
 472 /**
 473  * register_ftrace_event - register output for an event type
 474  * @event: the event type to register
 475  *
 476  * Event types are stored in a hash and this hash is used to
 477  * find a way to print an event. If the @event->type is set
 478  * then it will use that type, otherwise it will assign a
 479  * type to use.
 480  *
 481  * If you assign your own type, please make sure it is added
 482  * to the trace_type enum in trace.h, to avoid collisions
 483  * with the dynamic types.
 484  *
 485  * Returns the event type number or zero on error.
 486  */
 487 int register_ftrace_event(struct trace_event *event)
 488 {
 489         unsigned key;
 490         int ret = 0;
 491
 492         mutex_lock(&trace_event_mutex);
 493
 494         if (!event) {
 495                 ret = next_event_type++;
 496                 goto out;
 497         }
 498
 499         if (!event->type)
 500                 event->type = next_event_type++;
 501         else if (event->type > __TRACE_LAST_TYPE) {
 502                 printk(KERN_WARNING "Need to add type to trace.h\n");
 503                 WARN_ON(1);
 504         }
 505
 506         if (ftrace_find_event(event->type))
 507                 goto out;
 508
 509         if (event->trace == NULL)
 510                 event->trace = trace_nop_print;
 511         if (event->raw == NULL)
 512                 event->raw = trace_nop_print;
 513         if (event->hex == NULL)
 514                 event->hex = trace_nop_print;
 515         if (event->binary == NULL)
 516                 event->binary = trace_nop_print;
 517
 518         key = event->type & (EVENT_HASHSIZE - 1);
 519
 520         hlist_add_head_rcu(&event->node, &event_hash[key]);
 521
 522         ret = event->type;
 523  out:
 524         mutex_unlock(&trace_event_mutex);
 525
 526         return ret;
 527 }
 528
 529 /**
 530  * unregister_ftrace_event - remove a no longer used event
 531  * @event: the event to remove
 532  */
 533 int unregister_ftrace_event(struct trace_event *event)
 534 {
 535         mutex_lock(&trace_event_mutex);
 536         hlist_del(&event->node);
 537         mutex_unlock(&trace_event_mutex);
 538
 539         return 0;
 540 }
 541
 542 /*
 543  * Standard events
 544  */
 545
 546 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 547 {
 548         return TRACE_TYPE_HANDLED;
 549 }
 550
 551 /* TRACE_FN */
 552 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 553 {
 554         struct ftrace_entry *field;
 555         struct trace_seq *s = &iter->seq;
 556
 557         trace_assign_type(field, iter->ent);
 558
 559         if (!seq_print_ip_sym(s, field->ip, flags))
 560                 goto partial;
 561
 562         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 563                 if (!trace_seq_printf(s, " <-"))
 564                         goto partial;
 565                 if (!seq_print_ip_sym(s,
 566                                       field->parent_ip,
 567                                       flags))
 568                         goto partial;
 569         }
 570         if (!trace_seq_printf(s, "\n"))
 571                 goto partial;
 572
 573         return TRACE_TYPE_HANDLED;
 574
 575  partial:
 576         return TRACE_TYPE_PARTIAL_LINE;
 577 }
 578
 579 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 580 {
 581         struct ftrace_entry *field;
 582
 583         trace_assign_type(field, iter->ent);
 584
 585         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 586                               field->ip,
 587                               field->parent_ip))
 588                 return TRACE_TYPE_PARTIAL_LINE;
 589
 590         return TRACE_TYPE_HANDLED;
 591 }
 592
 593 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 594 {
 595         struct ftrace_entry *field;
 596         struct trace_seq *s = &iter->seq;
 597
 598         trace_assign_type(field, iter->ent);
 599
 600         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 601         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 602
 603         return TRACE_TYPE_HANDLED;
 604 }
 605
 606 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 607 {
 608         struct ftrace_entry *field;
 609         struct trace_seq *s = &iter->seq;
 610
 611         trace_assign_type(field, iter->ent);
 612
 613         SEQ_PUT_FIELD_RET(s, field->ip);
 614         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 615
 616         return TRACE_TYPE_HANDLED;
 617 }
 618
 619 static struct trace_event trace_fn_event = {
 620         .type           = TRACE_FN,
 621         .trace          = trace_fn_trace,
 622         .raw            = trace_fn_raw,
 623         .hex            = trace_fn_hex,
 624         .binary         = trace_fn_bin,
 625 };
 626
 627 /* TRACE_CTX an TRACE_WAKE */
 628 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 629                                              char *delim)
 630 {
 631         struct ctx_switch_entry *field;
 632         char comm[TASK_COMM_LEN];
 633         int S, T;
 634
 635
 636         trace_assign_type(field, iter->ent);
 637
 638         T = task_state_char(field->next_state);
 639         S = task_state_char(field->prev_state);
 640         trace_find_cmdline(field->next_pid, comm);
 641         if (!trace_seq_printf(&iter->seq,
 642                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 643                               field->prev_pid,
 644                               field->prev_prio,
 645                               S, delim,
 646                               field->next_cpu,
 647                               field->next_pid,
 648                               field->next_prio,
 649                               T, comm))
 650                 return TRACE_TYPE_PARTIAL_LINE;
 651
 652         return TRACE_TYPE_HANDLED;
 653 }
 654
 655 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 656 {
 657         return trace_ctxwake_print(iter, "==>");
 658 }
 659
 660 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 661                                           int flags)
 662 {
 663         return trace_ctxwake_print(iter, "  +");
 664 }
 665
 666 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 667 {
 668         struct ctx_switch_entry *field;
 669         int T;
 670
 671         trace_assign_type(field, iter->ent);
 672
 673         if (!S)
 674                 task_state_char(field->prev_state);
 675         T = task_state_char(field->next_state);
 676         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 677                               field->prev_pid,
 678                               field->prev_prio,
 679                               S,
 680                               field->next_cpu,
 681                               field->next_pid,
 682                               field->next_prio,
 683                               T))
 684                 return TRACE_TYPE_PARTIAL_LINE;
 685
 686         return TRACE_TYPE_HANDLED;
 687 }
 688
 689 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 690 {
 691         return trace_ctxwake_raw(iter, 0);
 692 }
 693
 694 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 695 {
 696         return trace_ctxwake_raw(iter, '+');
 697 }
 698
 699
 700 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 701 {
 702         struct ctx_switch_entry *field;
 703         struct trace_seq *s = &iter->seq;
 704         int T;
 705
 706         trace_assign_type(field, iter->ent);
 707
 708         if (!S)
 709                 task_state_char(field->prev_state);
 710         T = task_state_char(field->next_state);
 711
 712         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 713         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 714         SEQ_PUT_HEX_FIELD_RET(s, S);
 715         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 716         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 717         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 718         SEQ_PUT_HEX_FIELD_RET(s, T);
 719
 720         return TRACE_TYPE_HANDLED;
 721 }
 722
 723 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 724 {
 725         return trace_ctxwake_hex(iter, 0);
 726 }
 727
 728 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 729 {
 730         return trace_ctxwake_hex(iter, '+');
 731 }
 732
 733 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 734                                            int flags)
 735 {
 736         struct ctx_switch_entry *field;
 737         struct trace_seq *s = &iter->seq;
 738
 739         trace_assign_type(field, iter->ent);
 740
 741         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 742         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 743         SEQ_PUT_FIELD_RET(s, field->prev_state);
 744         SEQ_PUT_FIELD_RET(s, field->next_pid);
 745         SEQ_PUT_FIELD_RET(s, field->next_prio);
 746         SEQ_PUT_FIELD_RET(s, field->next_state);
 747
 748         return TRACE_TYPE_HANDLED;
 749 }
 750
 751 static struct trace_event trace_ctx_event = {
 752         .type           = TRACE_CTX,
 753         .trace          = trace_ctx_print,
 754         .raw            = trace_ctx_raw,
 755         .hex            = trace_ctx_hex,
 756         .binary         = trace_ctxwake_bin,
 757 };
 758
 759 static struct trace_event trace_wake_event = {
 760         .type           = TRACE_WAKE,
 761         .trace          = trace_wake_print,
 762         .raw            = trace_wake_raw,
 763         .hex            = trace_wake_hex,
 764         .binary         = trace_ctxwake_bin,
 765 };
 766
 767 /* TRACE_SPECIAL */
 768 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 769                                              int flags)
 770 {
 771         struct special_entry *field;
 772
 773         trace_assign_type(field, iter->ent);
 774
 775         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 776                               field->arg1,
 777                               field->arg2,
 778                               field->arg3))
 779                 return TRACE_TYPE_PARTIAL_LINE;
 780
 781         return TRACE_TYPE_HANDLED;
 782 }
 783
 784 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 785                                            int flags)
 786 {
 787         struct special_entry *field;
 788         struct trace_seq *s = &iter->seq;
 789
 790         trace_assign_type(field, iter->ent);
 791
 792         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
 793         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
 794         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
 795
 796         return TRACE_TYPE_HANDLED;
 797 }
 798
 799 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
 800                                            int flags)
 801 {
 802         struct special_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->arg1);
 808         SEQ_PUT_FIELD_RET(s, field->arg2);
 809         SEQ_PUT_FIELD_RET(s, field->arg3);
 810
 811         return TRACE_TYPE_HANDLED;
 812 }
 813
 814 static struct trace_event trace_special_event = {
 815         .type           = TRACE_SPECIAL,
 816         .trace          = trace_special_print,
 817         .raw            = trace_special_print,
 818         .hex            = trace_special_hex,
 819         .binary         = trace_special_bin,
 820 };
 821
 822 /* TRACE_STACK */
 823
 824 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 825                                            int flags)
 826 {
 827         struct stack_entry *field;
 828         struct trace_seq *s = &iter->seq;
 829         int i;
 830
 831         trace_assign_type(field, iter->ent);
 832
 833         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 834                 if (i) {
 835                         if (!trace_seq_puts(s, " <= "))
 836                                 goto partial;
 837
 838                         if (!seq_print_ip_sym(s, field->caller[i], flags))
 839                                 goto partial;
 840                 }
 841                 if (!trace_seq_puts(s, "\n"))
 842                         goto partial;
 843         }
 844
 845         return TRACE_TYPE_HANDLED;
 846
 847  partial:
 848         return TRACE_TYPE_PARTIAL_LINE;
 849 }
 850
 851 static struct trace_event trace_stack_event = {
 852         .type           = TRACE_STACK,
 853         .trace          = trace_stack_print,
 854         .raw            = trace_special_print,
 855         .hex            = trace_special_hex,
 856         .binary         = trace_special_bin,
 857 };
 858
 859 /* TRACE_USER_STACK */
 860 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 861                                                 int flags)
 862 {
 863         struct userstack_entry *field;
 864         struct trace_seq *s = &iter->seq;
 865
 866         trace_assign_type(field, iter->ent);
 867
 868         if (!seq_print_userip_objs(field, s, flags))
 869                 goto partial;
 870
 871         if (!trace_seq_putc(s, '\n'))
 872                 goto partial;
 873
 874         return TRACE_TYPE_HANDLED;
 875
 876  partial:
 877         return TRACE_TYPE_PARTIAL_LINE;
 878 }
 879
 880 static struct trace_event trace_user_stack_event = {
 881         .type           = TRACE_USER_STACK,
 882         .trace          = trace_user_stack_print,
 883         .raw            = trace_special_print,
 884         .hex            = trace_special_hex,
 885         .binary         = trace_special_bin,
 886 };
 887
 888 /* TRACE_BPRINT */
 889 static enum print_line_t
 890 trace_bprint_print(struct trace_iterator *iter, int flags)
 891 {
 892         struct trace_entry *entry = iter->ent;
 893         struct trace_seq *s = &iter->seq;
 894         struct bprint_entry *field;
 895
 896         trace_assign_type(field, entry);
 897
 898         if (!seq_print_ip_sym(s, field->ip, flags))
 899                 goto partial;
 900
 901         if (!trace_seq_puts(s, ": "))
 902                 goto partial;
 903
 904         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 905                 goto partial;
 906
 907         return TRACE_TYPE_HANDLED;
 908
 909  partial:
 910         return TRACE_TYPE_PARTIAL_LINE;
 911 }
 912
 913
 914 static enum print_line_t
 915 trace_bprint_raw(struct trace_iterator *iter, int flags)
 916 {
 917         struct bprint_entry *field;
 918         struct trace_seq *s = &iter->seq;
 919
 920         trace_assign_type(field, iter->ent);
 921
 922         if (!trace_seq_printf(s, ": %lx : ", field->ip))
 923                 goto partial;
 924
 925         if (!trace_seq_bprintf(s, field->fmt, field->buf))
 926                 goto partial;
 927
 928         return TRACE_TYPE_HANDLED;
 929
 930  partial:
 931         return TRACE_TYPE_PARTIAL_LINE;
 932 }
 933
 934
 935 static struct trace_event trace_bprint_event = {
 936         .type           = TRACE_BPRINT,
 937         .trace          = trace_bprint_print,
 938         .raw            = trace_bprint_raw,
 939 };
 940
 941 /* TRACE_PRINT */
 942 static enum print_line_t trace_print_print(struct trace_iterator *iter,
 943                                            int flags)
 944 {
 945         struct print_entry *field;
 946         struct trace_seq *s = &iter->seq;
 947
 948         trace_assign_type(field, iter->ent);
 949
 950         if (!seq_print_ip_sym(s, field->ip, flags))
 951                 goto partial;
 952
 953         if (!trace_seq_printf(s, ": %s", field->buf))
 954                 goto partial;
 955
 956         return TRACE_TYPE_HANDLED;
 957
 958  partial:
 959         return TRACE_TYPE_PARTIAL_LINE;
 960 }
 961
 962 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
 963 {
 964         struct print_entry *field;
 965
 966         trace_assign_type(field, iter->ent);
 967
 968         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
 969                 goto partial;
 970
 971         return TRACE_TYPE_HANDLED;
 972
 973  partial:
 974         return TRACE_TYPE_PARTIAL_LINE;
 975 }
 976
 977 static struct trace_event trace_print_event = {
 978         .type           = TRACE_PRINT,
 979         .trace          = trace_print_print,
 980         .raw            = trace_print_raw,
 981 };
 982
 983
 984 static struct trace_event *events[] __initdata = {
 985         &trace_fn_event,
 986         &trace_ctx_event,
 987         &trace_wake_event,
 988         &trace_special_event,
 989         &trace_stack_event,
 990         &trace_user_stack_event,
 991         &trace_bprint_event,
 992         &trace_print_event,
 993         NULL
 994 };
 995
 996 __init static int init_events(void)
 997 {
 998         struct trace_event *event;
 999         int i, ret;
1000
1001         for (i = 0; events[i]; i++) {
1002                 event = events[i];
1003
1004                 ret = register_ftrace_event(event);
1005                 if (!ret) {
1006                         printk(KERN_WARNING "event %d failed to register\n",
1007                                event->type);
1008                         WARN_ON_ONCE(1);
1009                 }
1010         }
1011
1012         return 0;
1013 }
1014 device_initcall(init_events);