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_sem);
  18
  19 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  20
  21 static int next_event_type = __TRACE_LAST_TYPE + 1;
  22
  23 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
  24 {
  25         struct trace_seq *s = &iter->seq;
  26         struct trace_entry *entry = iter->ent;
  27         struct bputs_entry *field;
  28
  29         trace_assign_type(field, entry);
  30
  31         trace_seq_puts(s, field->str);
  32
  33         return trace_handle_return(s);
  34 }
  35
  36 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  37 {
  38         struct trace_seq *s = &iter->seq;
  39         struct trace_entry *entry = iter->ent;
  40         struct bprint_entry *field;
  41
  42         trace_assign_type(field, entry);
  43
  44         trace_seq_bprintf(s, field->fmt, field->buf);
  45
  46         return trace_handle_return(s);
  47 }
  48
  49 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  50 {
  51         struct trace_seq *s = &iter->seq;
  52         struct trace_entry *entry = iter->ent;
  53         struct print_entry *field;
  54
  55         trace_assign_type(field, entry);
  56
  57         trace_seq_puts(s, field->buf);
  58
  59         return trace_handle_return(s);
  60 }
  61
  62 const char *
  63 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
  64                        unsigned long flags,
  65                        const struct trace_print_flags *flag_array)
  66 {
  67         unsigned long mask;
  68         const char *str;
  69         const char *ret = trace_seq_buffer_ptr(p);
  70         int i, first = 1;
  71
  72         for (i = 0;  flag_array[i].name && flags; i++) {
  73
  74                 mask = flag_array[i].mask;
  75                 if ((flags & mask) != mask)
  76                         continue;
  77
  78                 str = flag_array[i].name;
  79                 flags &= ~mask;
  80                 if (!first && delim)
  81                         trace_seq_puts(p, delim);
  82                 else
  83                         first = 0;
  84                 trace_seq_puts(p, str);
  85         }
  86
  87         /* check for left over flags */
  88         if (flags) {
  89                 if (!first && delim)
  90                         trace_seq_puts(p, delim);
  91                 trace_seq_printf(p, "0x%lx", flags);
  92         }
  93
  94         trace_seq_putc(p, 0);
  95
  96         return ret;
  97 }
  98 EXPORT_SYMBOL(ftrace_print_flags_seq);
  99
 100 const char *
 101 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 102                          const struct trace_print_flags *symbol_array)
 103 {
 104         int i;
 105         const char *ret = trace_seq_buffer_ptr(p);
 106
 107         for (i = 0;  symbol_array[i].name; i++) {
 108
 109                 if (val != symbol_array[i].mask)
 110                         continue;
 111
 112                 trace_seq_puts(p, symbol_array[i].name);
 113                 break;
 114         }
 115
 116         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 117                 trace_seq_printf(p, "0x%lx", val);
 118
 119         trace_seq_putc(p, 0);
 120
 121         return ret;
 122 }
 123 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 124
 125 #if BITS_PER_LONG == 32
 126 const char *
 127 ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 128                          const struct trace_print_flags_u64 *symbol_array)
 129 {
 130         int i;
 131         const char *ret = trace_seq_buffer_ptr(p);
 132
 133         for (i = 0;  symbol_array[i].name; i++) {
 134
 135                 if (val != symbol_array[i].mask)
 136                         continue;
 137
 138                 trace_seq_puts(p, symbol_array[i].name);
 139                 break;
 140         }
 141
 142         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 143                 trace_seq_printf(p, "0x%llx", val);
 144
 145         trace_seq_putc(p, 0);
 146
 147         return ret;
 148 }
 149 EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
 150 #endif
 151
 152 const char *
 153 ftrace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
 154                          unsigned int bitmask_size)
 155 {
 156         const char *ret = trace_seq_buffer_ptr(p);
 157
 158         trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
 159         trace_seq_putc(p, 0);
 160
 161         return ret;
 162 }
 163 EXPORT_SYMBOL_GPL(ftrace_print_bitmask_seq);
 164
 165 const char *
 166 ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 167 {
 168         int i;
 169         const char *ret = trace_seq_buffer_ptr(p);
 170
 171         for (i = 0; i < buf_len; i++)
 172                 trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
 173
 174         trace_seq_putc(p, 0);
 175
 176         return ret;
 177 }
 178 EXPORT_SYMBOL(ftrace_print_hex_seq);
 179
 180 int ftrace_raw_output_prep(struct trace_iterator *iter,
 181                            struct trace_event *trace_event)
 182 {
 183         struct ftrace_event_call *event;
 184         struct trace_seq *s = &iter->seq;
 185         struct trace_seq *p = &iter->tmp_seq;
 186         struct trace_entry *entry;
 187
 188         event = container_of(trace_event, struct ftrace_event_call, event);
 189         entry = iter->ent;
 190
 191         if (entry->type != event->event.type) {
 192                 WARN_ON_ONCE(1);
 193                 return TRACE_TYPE_UNHANDLED;
 194         }
 195
 196         trace_seq_init(p);
 197         trace_seq_printf(s, "%s: ", ftrace_event_name(event));
 198
 199         return trace_handle_return(s);
 200 }
 201 EXPORT_SYMBOL(ftrace_raw_output_prep);
 202
 203 static int ftrace_output_raw(struct trace_iterator *iter, char *name,
 204                              char *fmt, va_list ap)
 205 {
 206         struct trace_seq *s = &iter->seq;
 207
 208         trace_seq_printf(s, "%s: ", name);
 209         trace_seq_vprintf(s, fmt, ap);
 210
 211         return trace_handle_return(s);
 212 }
 213
 214 int ftrace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 215 {
 216         va_list ap;
 217         int ret;
 218
 219         va_start(ap, fmt);
 220         ret = ftrace_output_raw(iter, name, fmt, ap);
 221         va_end(ap);
 222
 223         return ret;
 224 }
 225 EXPORT_SYMBOL_GPL(ftrace_output_call);
 226
 227 #ifdef CONFIG_KRETPROBES
 228 static inline const char *kretprobed(const char *name)
 229 {
 230         static const char tramp_name[] = "kretprobe_trampoline";
 231         int size = sizeof(tramp_name);
 232
 233         if (strncmp(tramp_name, name, size) == 0)
 234                 return "[unknown/kretprobe'd]";
 235         return name;
 236 }
 237 #else
 238 static inline const char *kretprobed(const char *name)
 239 {
 240         return name;
 241 }
 242 #endif /* CONFIG_KRETPROBES */
 243
 244 static void
 245 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 246 {
 247 #ifdef CONFIG_KALLSYMS
 248         char str[KSYM_SYMBOL_LEN];
 249         const char *name;
 250
 251         kallsyms_lookup(address, NULL, NULL, NULL, str);
 252
 253         name = kretprobed(str);
 254
 255         trace_seq_printf(s, fmt, name);
 256 #endif
 257 }
 258
 259 static void
 260 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 261                      unsigned long address)
 262 {
 263 #ifdef CONFIG_KALLSYMS
 264         char str[KSYM_SYMBOL_LEN];
 265         const char *name;
 266
 267         sprint_symbol(str, address);
 268         name = kretprobed(str);
 269
 270         trace_seq_printf(s, fmt, name);
 271 #endif
 272 }
 273
 274 #ifndef CONFIG_64BIT
 275 # define IP_FMT "%08lx"
 276 #else
 277 # define IP_FMT "%016lx"
 278 #endif
 279
 280 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 281                       unsigned long ip, unsigned long sym_flags)
 282 {
 283         struct file *file = NULL;
 284         unsigned long vmstart = 0;
 285         int ret = 1;
 286
 287         if (s->full)
 288                 return 0;
 289
 290         if (mm) {
 291                 const struct vm_area_struct *vma;
 292
 293                 down_read(&mm->mmap_sem);
 294                 vma = find_vma(mm, ip);
 295                 if (vma) {
 296                         file = vma->vm_file;
 297                         vmstart = vma->vm_start;
 298                 }
 299                 if (file) {
 300                         ret = trace_seq_path(s, &file->f_path);
 301                         if (ret)
 302                                 trace_seq_printf(s, "[+0x%lx]",
 303                                                  ip - vmstart);
 304                 }
 305                 up_read(&mm->mmap_sem);
 306         }
 307         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 308                 trace_seq_printf(s, " <" IP_FMT ">", ip);
 309         return !trace_seq_has_overflowed(s);
 310 }
 311
 312 int
 313 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 314                       unsigned long sym_flags)
 315 {
 316         struct mm_struct *mm = NULL;
 317         unsigned int i;
 318
 319         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 320                 struct task_struct *task;
 321                 /*
 322                  * we do the lookup on the thread group leader,
 323                  * since individual threads might have already quit!
 324                  */
 325                 rcu_read_lock();
 326                 task = find_task_by_vpid(entry->tgid);
 327                 if (task)
 328                         mm = get_task_mm(task);
 329                 rcu_read_unlock();
 330         }
 331
 332         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 333                 unsigned long ip = entry->caller[i];
 334
 335                 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
 336                         break;
 337
 338                 trace_seq_puts(s, " => ");
 339
 340                 if (!ip) {
 341                         trace_seq_puts(s, "??");
 342                         trace_seq_putc(s, '\n');
 343                         continue;
 344                 }
 345
 346                 seq_print_user_ip(s, mm, ip, sym_flags);
 347                 trace_seq_putc(s, '\n');
 348         }
 349
 350         if (mm)
 351                 mmput(mm);
 352
 353         return !trace_seq_has_overflowed(s);
 354 }
 355
 356 int
 357 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 358 {
 359         if (!ip) {
 360                 trace_seq_putc(s, '0');
 361                 goto out;
 362         }
 363
 364         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 365                 seq_print_sym_offset(s, "%s", ip);
 366         else
 367                 seq_print_sym_short(s, "%s", ip);
 368
 369         if (sym_flags & TRACE_ITER_SYM_ADDR)
 370                 trace_seq_printf(s, " <" IP_FMT ">", ip);
 371
 372  out:
 373         return !trace_seq_has_overflowed(s);
 374 }
 375
 376 /**
 377  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 378  * @s: trace seq struct to write to
 379  * @entry: The trace entry field from the ring buffer
 380  *
 381  * Prints the generic fields of irqs off, in hard or softirq, preempt
 382  * count.
 383  */
 384 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 385 {
 386         char hardsoft_irq;
 387         char need_resched;
 388         char irqs_off;
 389         int hardirq;
 390         int softirq;
 391
 392         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 393         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 394
 395         irqs_off =
 396                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 397                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 398                 '.';
 399
 400         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 401                                 TRACE_FLAG_PREEMPT_RESCHED)) {
 402         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 403                 need_resched = 'N';
 404                 break;
 405         case TRACE_FLAG_NEED_RESCHED:
 406                 need_resched = 'n';
 407                 break;
 408         case TRACE_FLAG_PREEMPT_RESCHED:
 409                 need_resched = 'p';
 410                 break;
 411         default:
 412                 need_resched = '.';
 413                 break;
 414         }
 415
 416         hardsoft_irq =
 417                 (hardirq && softirq) ? 'H' :
 418                 hardirq ? 'h' :
 419                 softirq ? 's' :
 420                 '.';
 421
 422         trace_seq_printf(s, "%c%c%c",
 423                          irqs_off, need_resched, hardsoft_irq);
 424
 425         if (entry->preempt_count)
 426                 trace_seq_printf(s, "%x", entry->preempt_count);
 427         else
 428                 trace_seq_putc(s, '.');
 429
 430         return !trace_seq_has_overflowed(s);
 431 }
 432
 433 static int
 434 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 435 {
 436         char comm[TASK_COMM_LEN];
 437
 438         trace_find_cmdline(entry->pid, comm);
 439
 440         trace_seq_printf(s, "%8.8s-%-5d %3d",
 441                          comm, entry->pid, cpu);
 442
 443         return trace_print_lat_fmt(s, entry);
 444 }
 445
 446 static unsigned long preempt_mark_thresh_us = 100;
 447
 448 static int
 449 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 450 {
 451         unsigned long verbose = trace_flags & TRACE_ITER_VERBOSE;
 452         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 453         unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 454         unsigned long long rel_ts = next_ts - iter->ts;
 455         struct trace_seq *s = &iter->seq;
 456
 457         if (in_ns) {
 458                 abs_ts = ns2usecs(abs_ts);
 459                 rel_ts = ns2usecs(rel_ts);
 460         }
 461
 462         if (verbose && in_ns) {
 463                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 464                 unsigned long abs_msec = (unsigned long)abs_ts;
 465                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 466                 unsigned long rel_msec = (unsigned long)rel_ts;
 467
 468                 trace_seq_printf(
 469                         s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 470                         ns2usecs(iter->ts),
 471                         abs_msec, abs_usec,
 472                         rel_msec, rel_usec);
 473
 474         } else if (verbose && !in_ns) {
 475                 trace_seq_printf(
 476                         s, "[%016llx] %lld (+%lld): ",
 477                         iter->ts, abs_ts, rel_ts);
 478
 479         } else if (!verbose && in_ns) {
 480                 trace_seq_printf(
 481                         s, " %4lldus%c: ",
 482                         abs_ts,
 483                         rel_ts > preempt_mark_thresh_us ? '!' :
 484                         rel_ts > 1 ? '+' : ' ');
 485
 486         } else { /* !verbose && !in_ns */
 487                 trace_seq_printf(s, " %4lld: ", abs_ts);
 488         }
 489
 490         return !trace_seq_has_overflowed(s);
 491 }
 492
 493 int trace_print_context(struct trace_iterator *iter)
 494 {
 495         struct trace_seq *s = &iter->seq;
 496         struct trace_entry *entry = iter->ent;
 497         unsigned long long t;
 498         unsigned long secs, usec_rem;
 499         char comm[TASK_COMM_LEN];
 500
 501         trace_find_cmdline(entry->pid, comm);
 502
 503         trace_seq_printf(s, "%16s-%-5d [%03d] ",
 504                                comm, entry->pid, iter->cpu);
 505
 506         if (trace_flags & TRACE_ITER_IRQ_INFO)
 507                 trace_print_lat_fmt(s, entry);
 508
 509         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 510                 t = ns2usecs(iter->ts);
 511                 usec_rem = do_div(t, USEC_PER_SEC);
 512                 secs = (unsigned long)t;
 513                 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
 514         } else
 515                 trace_seq_printf(s, " %12llu: ", iter->ts);
 516
 517         return !trace_seq_has_overflowed(s);
 518 }
 519
 520 int trace_print_lat_context(struct trace_iterator *iter)
 521 {
 522         u64 next_ts;
 523         /* trace_find_next_entry will reset ent_size */
 524         int ent_size = iter->ent_size;
 525         struct trace_seq *s = &iter->seq;
 526         struct trace_entry *entry = iter->ent,
 527                            *next_entry = trace_find_next_entry(iter, NULL,
 528                                                                &next_ts);
 529         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 530
 531         /* Restore the original ent_size */
 532         iter->ent_size = ent_size;
 533
 534         if (!next_entry)
 535                 next_ts = iter->ts;
 536
 537         if (verbose) {
 538                 char comm[TASK_COMM_LEN];
 539
 540                 trace_find_cmdline(entry->pid, comm);
 541
 542                 trace_seq_printf(
 543                         s, "%16s %5d %3d %d %08x %08lx ",
 544                         comm, entry->pid, iter->cpu, entry->flags,
 545                         entry->preempt_count, iter->idx);
 546         } else {
 547                 lat_print_generic(s, entry, iter->cpu);
 548         }
 549
 550         lat_print_timestamp(iter, next_ts);
 551
 552         return !trace_seq_has_overflowed(s);
 553 }
 554
 555 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 556
 557 static int task_state_char(unsigned long state)
 558 {
 559         int bit = state ? __ffs(state) + 1 : 0;
 560
 561         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 562 }
 563
 564 /**
 565  * ftrace_find_event - find a registered event
 566  * @type: the type of event to look for
 567  *
 568  * Returns an event of type @type otherwise NULL
 569  * Called with trace_event_read_lock() held.
 570  */
 571 struct trace_event *ftrace_find_event(int type)
 572 {
 573         struct trace_event *event;
 574         unsigned key;
 575
 576         key = type & (EVENT_HASHSIZE - 1);
 577
 578         hlist_for_each_entry(event, &event_hash[key], node) {
 579                 if (event->type == type)
 580                         return event;
 581         }
 582
 583         return NULL;
 584 }
 585
 586 static LIST_HEAD(ftrace_event_list);
 587
 588 static int trace_search_list(struct list_head **list)
 589 {
 590         struct trace_event *e;
 591         int last = __TRACE_LAST_TYPE;
 592
 593         if (list_empty(&ftrace_event_list)) {
 594                 *list = &ftrace_event_list;
 595                 return last + 1;
 596         }
 597
 598         /*
 599          * We used up all possible max events,
 600          * lets see if somebody freed one.
 601          */
 602         list_for_each_entry(e, &ftrace_event_list, list) {
 603                 if (e->type != last + 1)
 604                         break;
 605                 last++;
 606         }
 607
 608         /* Did we used up all 65 thousand events??? */
 609         if ((last + 1) > FTRACE_MAX_EVENT)
 610                 return 0;
 611
 612         *list = &e->list;
 613         return last + 1;
 614 }
 615
 616 void trace_event_read_lock(void)
 617 {
 618         down_read(&trace_event_sem);
 619 }
 620
 621 void trace_event_read_unlock(void)
 622 {
 623         up_read(&trace_event_sem);
 624 }
 625
 626 /**
 627  * register_ftrace_event - register output for an event type
 628  * @event: the event type to register
 629  *
 630  * Event types are stored in a hash and this hash is used to
 631  * find a way to print an event. If the @event->type is set
 632  * then it will use that type, otherwise it will assign a
 633  * type to use.
 634  *
 635  * If you assign your own type, please make sure it is added
 636  * to the trace_type enum in trace.h, to avoid collisions
 637  * with the dynamic types.
 638  *
 639  * Returns the event type number or zero on error.
 640  */
 641 int register_ftrace_event(struct trace_event *event)
 642 {
 643         unsigned key;
 644         int ret = 0;
 645
 646         down_write(&trace_event_sem);
 647
 648         if (WARN_ON(!event))
 649                 goto out;
 650
 651         if (WARN_ON(!event->funcs))
 652                 goto out;
 653
 654         INIT_LIST_HEAD(&event->list);
 655
 656         if (!event->type) {
 657                 struct list_head *list = NULL;
 658
 659                 if (next_event_type > FTRACE_MAX_EVENT) {
 660
 661                         event->type = trace_search_list(&list);
 662                         if (!event->type)
 663                                 goto out;
 664
 665                 } else {
 666
 667                         event->type = next_event_type++;
 668                         list = &ftrace_event_list;
 669                 }
 670
 671                 if (WARN_ON(ftrace_find_event(event->type)))
 672                         goto out;
 673
 674                 list_add_tail(&event->list, list);
 675
 676         } else if (event->type > __TRACE_LAST_TYPE) {
 677                 printk(KERN_WARNING "Need to add type to trace.h\n");
 678                 WARN_ON(1);
 679                 goto out;
 680         } else {
 681                 /* Is this event already used */
 682                 if (ftrace_find_event(event->type))
 683                         goto out;
 684         }
 685
 686         if (event->funcs->trace == NULL)
 687                 event->funcs->trace = trace_nop_print;
 688         if (event->funcs->raw == NULL)
 689                 event->funcs->raw = trace_nop_print;
 690         if (event->funcs->hex == NULL)
 691                 event->funcs->hex = trace_nop_print;
 692         if (event->funcs->binary == NULL)
 693                 event->funcs->binary = trace_nop_print;
 694
 695         key = event->type & (EVENT_HASHSIZE - 1);
 696
 697         hlist_add_head(&event->node, &event_hash[key]);
 698
 699         ret = event->type;
 700  out:
 701         up_write(&trace_event_sem);
 702
 703         return ret;
 704 }
 705 EXPORT_SYMBOL_GPL(register_ftrace_event);
 706
 707 /*
 708  * Used by module code with the trace_event_sem held for write.
 709  */
 710 int __unregister_ftrace_event(struct trace_event *event)
 711 {
 712         hlist_del(&event->node);
 713         list_del(&event->list);
 714         return 0;
 715 }
 716
 717 /**
 718  * unregister_ftrace_event - remove a no longer used event
 719  * @event: the event to remove
 720  */
 721 int unregister_ftrace_event(struct trace_event *event)
 722 {
 723         down_write(&trace_event_sem);
 724         __unregister_ftrace_event(event);
 725         up_write(&trace_event_sem);
 726
 727         return 0;
 728 }
 729 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 730
 731 /*
 732  * Standard events
 733  */
 734
 735 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 736                                   struct trace_event *event)
 737 {
 738         trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
 739
 740         return trace_handle_return(&iter->seq);
 741 }
 742
 743 /* TRACE_FN */
 744 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 745                                         struct trace_event *event)
 746 {
 747         struct ftrace_entry *field;
 748         struct trace_seq *s = &iter->seq;
 749
 750         trace_assign_type(field, iter->ent);
 751
 752         seq_print_ip_sym(s, field->ip, flags);
 753
 754         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 755                 trace_seq_puts(s, " <-");
 756                 seq_print_ip_sym(s, field->parent_ip, flags);
 757         }
 758
 759         trace_seq_putc(s, '\n');
 760
 761         return trace_handle_return(s);
 762 }
 763
 764 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 765                                       struct trace_event *event)
 766 {
 767         struct ftrace_entry *field;
 768
 769         trace_assign_type(field, iter->ent);
 770
 771         trace_seq_printf(&iter->seq, "%lx %lx\n",
 772                          field->ip,
 773                          field->parent_ip);
 774
 775         return trace_handle_return(&iter->seq);
 776 }
 777
 778 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
 779                                       struct trace_event *event)
 780 {
 781         struct ftrace_entry *field;
 782         struct trace_seq *s = &iter->seq;
 783
 784         trace_assign_type(field, iter->ent);
 785
 786         SEQ_PUT_HEX_FIELD(s, field->ip);
 787         SEQ_PUT_HEX_FIELD(s, field->parent_ip);
 788
 789         return trace_handle_return(s);
 790 }
 791
 792 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
 793                                       struct trace_event *event)
 794 {
 795         struct ftrace_entry *field;
 796         struct trace_seq *s = &iter->seq;
 797
 798         trace_assign_type(field, iter->ent);
 799
 800         SEQ_PUT_FIELD(s, field->ip);
 801         SEQ_PUT_FIELD(s, field->parent_ip);
 802
 803         return trace_handle_return(s);
 804 }
 805
 806 static struct trace_event_functions trace_fn_funcs = {
 807         .trace          = trace_fn_trace,
 808         .raw            = trace_fn_raw,
 809         .hex            = trace_fn_hex,
 810         .binary         = trace_fn_bin,
 811 };
 812
 813 static struct trace_event trace_fn_event = {
 814         .type           = TRACE_FN,
 815         .funcs          = &trace_fn_funcs,
 816 };
 817
 818 /* TRACE_CTX an TRACE_WAKE */
 819 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 820                                              char *delim)
 821 {
 822         struct ctx_switch_entry *field;
 823         char comm[TASK_COMM_LEN];
 824         int S, T;
 825
 826
 827         trace_assign_type(field, iter->ent);
 828
 829         T = task_state_char(field->next_state);
 830         S = task_state_char(field->prev_state);
 831         trace_find_cmdline(field->next_pid, comm);
 832         trace_seq_printf(&iter->seq,
 833                          " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 834                          field->prev_pid,
 835                          field->prev_prio,
 836                          S, delim,
 837                          field->next_cpu,
 838                          field->next_pid,
 839                          field->next_prio,
 840                          T, comm);
 841
 842         return trace_handle_return(&iter->seq);
 843 }
 844
 845 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
 846                                          struct trace_event *event)
 847 {
 848         return trace_ctxwake_print(iter, "==>");
 849 }
 850
 851 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 852                                           int flags, struct trace_event *event)
 853 {
 854         return trace_ctxwake_print(iter, "  +");
 855 }
 856
 857 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 858 {
 859         struct ctx_switch_entry *field;
 860         int T;
 861
 862         trace_assign_type(field, iter->ent);
 863
 864         if (!S)
 865                 S = task_state_char(field->prev_state);
 866         T = task_state_char(field->next_state);
 867         trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 868                          field->prev_pid,
 869                          field->prev_prio,
 870                          S,
 871                          field->next_cpu,
 872                          field->next_pid,
 873                          field->next_prio,
 874                          T);
 875
 876         return trace_handle_return(&iter->seq);
 877 }
 878
 879 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
 880                                        struct trace_event *event)
 881 {
 882         return trace_ctxwake_raw(iter, 0);
 883 }
 884
 885 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
 886                                         struct trace_event *event)
 887 {
 888         return trace_ctxwake_raw(iter, '+');
 889 }
 890
 891
 892 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 893 {
 894         struct ctx_switch_entry *field;
 895         struct trace_seq *s = &iter->seq;
 896         int T;
 897
 898         trace_assign_type(field, iter->ent);
 899
 900         if (!S)
 901                 S = task_state_char(field->prev_state);
 902         T = task_state_char(field->next_state);
 903
 904         SEQ_PUT_HEX_FIELD(s, field->prev_pid);
 905         SEQ_PUT_HEX_FIELD(s, field->prev_prio);
 906         SEQ_PUT_HEX_FIELD(s, S);
 907         SEQ_PUT_HEX_FIELD(s, field->next_cpu);
 908         SEQ_PUT_HEX_FIELD(s, field->next_pid);
 909         SEQ_PUT_HEX_FIELD(s, field->next_prio);
 910         SEQ_PUT_HEX_FIELD(s, T);
 911
 912         return trace_handle_return(s);
 913 }
 914
 915 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
 916                                        struct trace_event *event)
 917 {
 918         return trace_ctxwake_hex(iter, 0);
 919 }
 920
 921 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
 922                                         struct trace_event *event)
 923 {
 924         return trace_ctxwake_hex(iter, '+');
 925 }
 926
 927 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 928                                            int flags, struct trace_event *event)
 929 {
 930         struct ctx_switch_entry *field;
 931         struct trace_seq *s = &iter->seq;
 932
 933         trace_assign_type(field, iter->ent);
 934
 935         SEQ_PUT_FIELD(s, field->prev_pid);
 936         SEQ_PUT_FIELD(s, field->prev_prio);
 937         SEQ_PUT_FIELD(s, field->prev_state);
 938         SEQ_PUT_FIELD(s, field->next_cpu);
 939         SEQ_PUT_FIELD(s, field->next_pid);
 940         SEQ_PUT_FIELD(s, field->next_prio);
 941         SEQ_PUT_FIELD(s, field->next_state);
 942
 943         return trace_handle_return(s);
 944 }
 945
 946 static struct trace_event_functions trace_ctx_funcs = {
 947         .trace          = trace_ctx_print,
 948         .raw            = trace_ctx_raw,
 949         .hex            = trace_ctx_hex,
 950         .binary         = trace_ctxwake_bin,
 951 };
 952
 953 static struct trace_event trace_ctx_event = {
 954         .type           = TRACE_CTX,
 955         .funcs          = &trace_ctx_funcs,
 956 };
 957
 958 static struct trace_event_functions trace_wake_funcs = {
 959         .trace          = trace_wake_print,
 960         .raw            = trace_wake_raw,
 961         .hex            = trace_wake_hex,
 962         .binary         = trace_ctxwake_bin,
 963 };
 964
 965 static struct trace_event trace_wake_event = {
 966         .type           = TRACE_WAKE,
 967         .funcs          = &trace_wake_funcs,
 968 };
 969
 970 /* TRACE_STACK */
 971
 972 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
 973                                            int flags, struct trace_event *event)
 974 {
 975         struct stack_entry *field;
 976         struct trace_seq *s = &iter->seq;
 977         unsigned long *p;
 978         unsigned long *end;
 979
 980         trace_assign_type(field, iter->ent);
 981         end = (unsigned long *)((long)iter->ent + iter->ent_size);
 982
 983         trace_seq_puts(s, "<stack trace>\n");
 984
 985         for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
 986
 987                 if (trace_seq_has_overflowed(s))
 988                         break;
 989
 990                 trace_seq_puts(s, " => ");
 991                 seq_print_ip_sym(s, *p, flags);
 992                 trace_seq_putc(s, '\n');
 993         }
 994
 995         return trace_handle_return(s);
 996 }
 997
 998 static struct trace_event_functions trace_stack_funcs = {
 999         .trace          = trace_stack_print,
1000 };
1001
1002 static struct trace_event trace_stack_event = {
1003         .type           = TRACE_STACK,
1004         .funcs          = &trace_stack_funcs,
1005 };
1006
1007 /* TRACE_USER_STACK */
1008 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1009                                                 int flags, struct trace_event *event)
1010 {
1011         struct userstack_entry *field;
1012         struct trace_seq *s = &iter->seq;
1013
1014         trace_assign_type(field, iter->ent);
1015
1016         trace_seq_puts(s, "<user stack trace>\n");
1017         seq_print_userip_objs(field, s, flags);
1018
1019         return trace_handle_return(s);
1020 }
1021
1022 static struct trace_event_functions trace_user_stack_funcs = {
1023         .trace          = trace_user_stack_print,
1024 };
1025
1026 static struct trace_event trace_user_stack_event = {
1027         .type           = TRACE_USER_STACK,
1028         .funcs          = &trace_user_stack_funcs,
1029 };
1030
1031 /* TRACE_BPUTS */
1032 static enum print_line_t
1033 trace_bputs_print(struct trace_iterator *iter, int flags,
1034                    struct trace_event *event)
1035 {
1036         struct trace_entry *entry = iter->ent;
1037         struct trace_seq *s = &iter->seq;
1038         struct bputs_entry *field;
1039
1040         trace_assign_type(field, entry);
1041
1042         seq_print_ip_sym(s, field->ip, flags);
1043         trace_seq_puts(s, ": ");
1044         trace_seq_puts(s, field->str);
1045
1046         return trace_handle_return(s);
1047 }
1048
1049
1050 static enum print_line_t
1051 trace_bputs_raw(struct trace_iterator *iter, int flags,
1052                 struct trace_event *event)
1053 {
1054         struct bputs_entry *field;
1055         struct trace_seq *s = &iter->seq;
1056
1057         trace_assign_type(field, iter->ent);
1058
1059         trace_seq_printf(s, ": %lx : ", field->ip);
1060         trace_seq_puts(s, field->str);
1061
1062         return trace_handle_return(s);
1063 }
1064
1065 static struct trace_event_functions trace_bputs_funcs = {
1066         .trace          = trace_bputs_print,
1067         .raw            = trace_bputs_raw,
1068 };
1069
1070 static struct trace_event trace_bputs_event = {
1071         .type           = TRACE_BPUTS,
1072         .funcs          = &trace_bputs_funcs,
1073 };
1074
1075 /* TRACE_BPRINT */
1076 static enum print_line_t
1077 trace_bprint_print(struct trace_iterator *iter, int flags,
1078                    struct trace_event *event)
1079 {
1080         struct trace_entry *entry = iter->ent;
1081         struct trace_seq *s = &iter->seq;
1082         struct bprint_entry *field;
1083
1084         trace_assign_type(field, entry);
1085
1086         seq_print_ip_sym(s, field->ip, flags);
1087         trace_seq_puts(s, ": ");
1088         trace_seq_bprintf(s, field->fmt, field->buf);
1089
1090         return trace_handle_return(s);
1091 }
1092
1093
1094 static enum print_line_t
1095 trace_bprint_raw(struct trace_iterator *iter, int flags,
1096                  struct trace_event *event)
1097 {
1098         struct bprint_entry *field;
1099         struct trace_seq *s = &iter->seq;
1100
1101         trace_assign_type(field, iter->ent);
1102
1103         trace_seq_printf(s, ": %lx : ", field->ip);
1104         trace_seq_bprintf(s, field->fmt, field->buf);
1105
1106         return trace_handle_return(s);
1107 }
1108
1109 static struct trace_event_functions trace_bprint_funcs = {
1110         .trace          = trace_bprint_print,
1111         .raw            = trace_bprint_raw,
1112 };
1113
1114 static struct trace_event trace_bprint_event = {
1115         .type           = TRACE_BPRINT,
1116         .funcs          = &trace_bprint_funcs,
1117 };
1118
1119 /* TRACE_PRINT */
1120 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1121                                            int flags, struct trace_event *event)
1122 {
1123         struct print_entry *field;
1124         struct trace_seq *s = &iter->seq;
1125
1126         trace_assign_type(field, iter->ent);
1127
1128         seq_print_ip_sym(s, field->ip, flags);
1129         trace_seq_printf(s, ": %s", field->buf);
1130
1131         return trace_handle_return(s);
1132 }
1133
1134 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1135                                          struct trace_event *event)
1136 {
1137         struct print_entry *field;
1138
1139         trace_assign_type(field, iter->ent);
1140
1141         trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1142
1143         return trace_handle_return(&iter->seq);
1144 }
1145
1146 static struct trace_event_functions trace_print_funcs = {
1147         .trace          = trace_print_print,
1148         .raw            = trace_print_raw,
1149 };
1150
1151 static struct trace_event trace_print_event = {
1152         .type           = TRACE_PRINT,
1153         .funcs          = &trace_print_funcs,
1154 };
1155
1156
1157 static struct trace_event *events[] __initdata = {
1158         &trace_fn_event,
1159         &trace_ctx_event,
1160         &trace_wake_event,
1161         &trace_stack_event,
1162         &trace_user_stack_event,
1163         &trace_bputs_event,
1164         &trace_bprint_event,
1165         &trace_print_event,
1166         NULL
1167 };
1168
1169 __init static int init_events(void)
1170 {
1171         struct trace_event *event;
1172         int i, ret;
1173
1174         for (i = 0; events[i]; i++) {
1175                 event = events[i];
1176
1177                 ret = register_ftrace_event(event);
1178                 if (!ret) {
1179                         printk(KERN_WARNING "event %d failed to register\n",
1180                                event->type);
1181                         WARN_ON_ONCE(1);
1182                 }
1183         }
1184
1185         return 0;
1186 }
1187 early_initcall(init_events);