kernel/trace/trace_output.c

   1 /*
   2  * trace_output.c
   3  *
   4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5  *
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11
  12 #include "trace_output.h"
  13
  14 /* must be a power of 2 */
  15 #define EVENT_HASHSIZE  128
  16
  17 DECLARE_RWSEM(trace_event_mutex);
  18
  19 DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
  20 EXPORT_PER_CPU_SYMBOL(ftrace_event_seq);
  21
  22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  23
  24 static int next_event_type = __TRACE_LAST_TYPE + 1;
  25
  26 void trace_print_seq(struct seq_file *m, struct trace_seq *s)
  27 {
  28         int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  29
  30         seq_write(m, s->buffer, len);
  31
  32         trace_seq_init(s);
  33 }
  34
  35 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  36 {
  37         struct trace_seq *s = &iter->seq;
  38         struct trace_entry *entry = iter->ent;
  39         struct bprint_entry *field;
  40         int ret;
  41
  42         trace_assign_type(field, entry);
  43
  44         ret = trace_seq_bprintf(s, field->fmt, field->buf);
  45         if (!ret)
  46                 return TRACE_TYPE_PARTIAL_LINE;
  47
  48         return TRACE_TYPE_HANDLED;
  49 }
  50
  51 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  52 {
  53         struct trace_seq *s = &iter->seq;
  54         struct trace_entry *entry = iter->ent;
  55         struct print_entry *field;
  56         int ret;
  57
  58         trace_assign_type(field, entry);
  59
  60         ret = trace_seq_printf(s, "%s", field->buf);
  61         if (!ret)
  62                 return TRACE_TYPE_PARTIAL_LINE;
  63
  64         return TRACE_TYPE_HANDLED;
  65 }
  66
  67 /**
  68  * trace_seq_printf - sequence printing of trace information
  69  * @s: trace sequence descriptor
  70  * @fmt: printf format string
  71  *
  72  * The tracer may use either sequence operations or its own
  73  * copy to user routines. To simplify formating of a trace
  74  * trace_seq_printf is used to store strings into a special
  75  * buffer (@s). Then the output may be either used by
  76  * the sequencer or pulled into another buffer.
  77  */
  78 int
  79 trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  80 {
  81         int len = (PAGE_SIZE - 1) - s->len;
  82         va_list ap;
  83         int ret;
  84
  85         if (!len)
  86                 return 0;
  87
  88         va_start(ap, fmt);
  89         ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  90         va_end(ap);
  91
  92         /* If we can't write it all, don't bother writing anything */
  93         if (ret >= len)
  94                 return 0;
  95
  96         s->len += ret;
  97
  98         return len;
  99 }
 100 EXPORT_SYMBOL_GPL(trace_seq_printf);
 101
 102 /**
 103  * trace_seq_vprintf - sequence printing of trace information
 104  * @s: trace sequence descriptor
 105  * @fmt: printf format string
 106  *
 107  * The tracer may use either sequence operations or its own
 108  * copy to user routines. To simplify formating of a trace
 109  * trace_seq_printf is used to store strings into a special
 110  * buffer (@s). Then the output may be either used by
 111  * the sequencer or pulled into another buffer.
 112  */
 113 int
 114 trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 115 {
 116         int len = (PAGE_SIZE - 1) - s->len;
 117         int ret;
 118
 119         if (!len)
 120                 return 0;
 121
 122         ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 123
 124         /* If we can't write it all, don't bother writing anything */
 125         if (ret >= len)
 126                 return 0;
 127
 128         s->len += ret;
 129
 130         return len;
 131 }
 132 EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 133
 134 int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 135 {
 136         int len = (PAGE_SIZE - 1) - s->len;
 137         int ret;
 138
 139         if (!len)
 140                 return 0;
 141
 142         ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 143
 144         /* If we can't write it all, don't bother writing anything */
 145         if (ret >= len)
 146                 return 0;
 147
 148         s->len += ret;
 149
 150         return len;
 151 }
 152
 153 /**
 154  * trace_seq_puts - trace sequence printing of simple string
 155  * @s: trace sequence descriptor
 156  * @str: simple string to record
 157  *
 158  * The tracer may use either the sequence operations or its own
 159  * copy to user routines. This function records a simple string
 160  * into a special buffer (@s) for later retrieval by a sequencer
 161  * or other mechanism.
 162  */
 163 int trace_seq_puts(struct trace_seq *s, const char *str)
 164 {
 165         int len = strlen(str);
 166
 167         if (len > ((PAGE_SIZE - 1) - s->len))
 168                 return 0;
 169
 170         memcpy(s->buffer + s->len, str, len);
 171         s->len += len;
 172
 173         return len;
 174 }
 175
 176 int trace_seq_putc(struct trace_seq *s, unsigned char c)
 177 {
 178         if (s->len >= (PAGE_SIZE - 1))
 179                 return 0;
 180
 181         s->buffer[s->len++] = c;
 182
 183         return 1;
 184 }
 185
 186 int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 187 {
 188         if (len > ((PAGE_SIZE - 1) - s->len))
 189                 return 0;
 190
 191         memcpy(s->buffer + s->len, mem, len);
 192         s->len += len;
 193
 194         return len;
 195 }
 196
 197 int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 198 {
 199         unsigned char hex[HEX_CHARS];
 200         const unsigned char *data = mem;
 201         int i, j;
 202
 203 #ifdef __BIG_ENDIAN
 204         for (i = 0, j = 0; i < len; i++) {
 205 #else
 206         for (i = len-1, j = 0; i >= 0; i--) {
 207 #endif
 208                 hex[j++] = hex_asc_hi(data[i]);
 209                 hex[j++] = hex_asc_lo(data[i]);
 210         }
 211         hex[j++] = ' ';
 212
 213         return trace_seq_putmem(s, hex, j);
 214 }
 215
 216 void *trace_seq_reserve(struct trace_seq *s, size_t len)
 217 {
 218         void *ret;
 219
 220         if (len > ((PAGE_SIZE - 1) - s->len))
 221                 return NULL;
 222
 223         ret = s->buffer + s->len;
 224         s->len += len;
 225
 226         return ret;
 227 }
 228
 229 int trace_seq_path(struct trace_seq *s, struct path *path)
 230 {
 231         unsigned char *p;
 232
 233         if (s->len >= (PAGE_SIZE - 1))
 234                 return 0;
 235         p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 236         if (!IS_ERR(p)) {
 237                 p = mangle_path(s->buffer + s->len, p, "\n");
 238                 if (p) {
 239                         s->len = p - s->buffer;
 240                         return 1;
 241                 }
 242         } else {
 243                 s->buffer[s->len++] = '?';
 244                 return 1;
 245         }
 246
 247         return 0;
 248 }
 249
 250 const char *
 251 ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 252                        unsigned long flags,
 253                        const struct trace_print_flags *flag_array)
 254 {
 255         unsigned long mask;
 256         const char *str;
 257         const char *ret = p->buffer + p->len;
 258         int i;
 259
 260         for (i = 0;  flag_array[i].name && flags; i++) {
 261
 262                 mask = flag_array[i].mask;
 263                 if ((flags & mask) != mask)
 264                         continue;
 265
 266                 str = flag_array[i].name;
 267                 flags &= ~mask;
 268                 if (p->len && delim)
 269                         trace_seq_puts(p, delim);
 270                 trace_seq_puts(p, str);
 271         }
 272
 273         /* check for left over flags */
 274         if (flags) {
 275                 if (p->len && delim)
 276                         trace_seq_puts(p, delim);
 277                 trace_seq_printf(p, "0x%lx", flags);
 278         }
 279
 280         trace_seq_putc(p, 0);
 281
 282         return ret;
 283 }
 284 EXPORT_SYMBOL(ftrace_print_flags_seq);
 285
 286 const char *
 287 ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 288                          const struct trace_print_flags *symbol_array)
 289 {
 290         int i;
 291         const char *ret = p->buffer + p->len;
 292
 293         for (i = 0;  symbol_array[i].name; i++) {
 294
 295                 if (val != symbol_array[i].mask)
 296                         continue;
 297
 298                 trace_seq_puts(p, symbol_array[i].name);
 299                 break;
 300         }
 301
 302         if (!p->len)
 303                 trace_seq_printf(p, "0x%lx", val);
 304
 305         trace_seq_putc(p, 0);
 306
 307         return ret;
 308 }
 309 EXPORT_SYMBOL(ftrace_print_symbols_seq);
 310
 311 #ifdef CONFIG_KRETPROBES
 312 static inline const char *kretprobed(const char *name)
 313 {
 314         static const char tramp_name[] = "kretprobe_trampoline";
 315         int size = sizeof(tramp_name);
 316
 317         if (strncmp(tramp_name, name, size) == 0)
 318                 return "[unknown/kretprobe'd]";
 319         return name;
 320 }
 321 #else
 322 static inline const char *kretprobed(const char *name)
 323 {
 324         return name;
 325 }
 326 #endif /* CONFIG_KRETPROBES */
 327
 328 static int
 329 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 330 {
 331 #ifdef CONFIG_KALLSYMS
 332         char str[KSYM_SYMBOL_LEN];
 333         const char *name;
 334
 335         kallsyms_lookup(address, NULL, NULL, NULL, str);
 336
 337         name = kretprobed(str);
 338
 339         return trace_seq_printf(s, fmt, name);
 340 #endif
 341         return 1;
 342 }
 343
 344 static int
 345 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 346                      unsigned long address)
 347 {
 348 #ifdef CONFIG_KALLSYMS
 349         char str[KSYM_SYMBOL_LEN];
 350         const char *name;
 351
 352         sprint_symbol(str, address);
 353         name = kretprobed(str);
 354
 355         return trace_seq_printf(s, fmt, name);
 356 #endif
 357         return 1;
 358 }
 359
 360 #ifndef CONFIG_64BIT
 361 # define IP_FMT "%08lx"
 362 #else
 363 # define IP_FMT "%016lx"
 364 #endif
 365
 366 int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 367                       unsigned long ip, unsigned long sym_flags)
 368 {
 369         struct file *file = NULL;
 370         unsigned long vmstart = 0;
 371         int ret = 1;
 372
 373         if (mm) {
 374                 const struct vm_area_struct *vma;
 375
 376                 down_read(&mm->mmap_sem);
 377                 vma = find_vma(mm, ip);
 378                 if (vma) {
 379                         file = vma->vm_file;
 380                         vmstart = vma->vm_start;
 381                 }
 382                 if (file) {
 383                         ret = trace_seq_path(s, &file->f_path);
 384                         if (ret)
 385                                 ret = trace_seq_printf(s, "[+0x%lx]",
 386                                                        ip - vmstart);
 387                 }
 388                 up_read(&mm->mmap_sem);
 389         }
 390         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 391                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 392         return ret;
 393 }
 394
 395 int
 396 seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 397                       unsigned long sym_flags)
 398 {
 399         struct mm_struct *mm = NULL;
 400         int ret = 1;
 401         unsigned int i;
 402
 403         if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 404                 struct task_struct *task;
 405                 /*
 406                  * we do the lookup on the thread group leader,
 407                  * since individual threads might have already quit!
 408                  */
 409                 rcu_read_lock();
 410                 task = find_task_by_vpid(entry->tgid);
 411                 if (task)
 412                         mm = get_task_mm(task);
 413                 rcu_read_unlock();
 414         }
 415
 416         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 417                 unsigned long ip = entry->caller[i];
 418
 419                 if (ip == ULONG_MAX || !ret)
 420                         break;
 421                 if (ret)
 422                         ret = trace_seq_puts(s, " => ");
 423                 if (!ip) {
 424                         if (ret)
 425                                 ret = trace_seq_puts(s, "??");
 426                         if (ret)
 427                                 ret = trace_seq_puts(s, "\n");
 428                         continue;
 429                 }
 430                 if (!ret)
 431                         break;
 432                 if (ret)
 433                         ret = seq_print_user_ip(s, mm, ip, sym_flags);
 434                 ret = trace_seq_puts(s, "\n");
 435         }
 436
 437         if (mm)
 438                 mmput(mm);
 439         return ret;
 440 }
 441
 442 int
 443 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 444 {
 445         int ret;
 446
 447         if (!ip)
 448                 return trace_seq_printf(s, "0");
 449
 450         if (sym_flags & TRACE_ITER_SYM_OFFSET)
 451                 ret = seq_print_sym_offset(s, "%s", ip);
 452         else
 453                 ret = seq_print_sym_short(s, "%s", ip);
 454
 455         if (!ret)
 456                 return 0;
 457
 458         if (sym_flags & TRACE_ITER_SYM_ADDR)
 459                 ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 460         return ret;
 461 }
 462
 463 /**
 464  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 465  * @s: trace seq struct to write to
 466  * @entry: The trace entry field from the ring buffer
 467  *
 468  * Prints the generic fields of irqs off, in hard or softirq, preempt
 469  * count and lock depth.
 470  */
 471 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 472 {
 473         int hardirq, softirq;
 474         int ret;
 475
 476         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 477         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 478
 479         if (!trace_seq_printf(s, "%c%c%c",
 480                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 481                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
 482                                   'X' : '.',
 483                               (entry->flags & TRACE_FLAG_NEED_RESCHED) ?
 484                                 'N' : '.',
 485                               (hardirq && softirq) ? 'H' :
 486                                 hardirq ? 'h' : softirq ? 's' : '.'))
 487                 return 0;
 488
 489         if (entry->preempt_count)
 490                 ret = trace_seq_printf(s, "%x", entry->preempt_count);
 491         else
 492                 ret = trace_seq_putc(s, '.');
 493
 494         if (!ret)
 495                 return 0;
 496
 497         if (entry->lock_depth < 0)
 498                 return trace_seq_putc(s, '.');
 499
 500         return trace_seq_printf(s, "%d", entry->lock_depth);
 501 }
 502
 503 static int
 504 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 505 {
 506         char comm[TASK_COMM_LEN];
 507
 508         trace_find_cmdline(entry->pid, comm);
 509
 510         if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 511                               comm, entry->pid, cpu))
 512                 return 0;
 513
 514         return trace_print_lat_fmt(s, entry);
 515 }
 516
 517 static unsigned long preempt_mark_thresh = 100;
 518
 519 static int
 520 lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 521                     unsigned long rel_usecs)
 522 {
 523         return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 524                                 rel_usecs > preempt_mark_thresh ? '!' :
 525                                   rel_usecs > 1 ? '+' : ' ');
 526 }
 527
 528 int trace_print_context(struct trace_iterator *iter)
 529 {
 530         struct trace_seq *s = &iter->seq;
 531         struct trace_entry *entry = iter->ent;
 532         unsigned long long t = ns2usecs(iter->ts);
 533         unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 534         unsigned long secs = (unsigned long)t;
 535         char comm[TASK_COMM_LEN];
 536
 537         trace_find_cmdline(entry->pid, comm);
 538
 539         return trace_seq_printf(s, "%16s-%-5d [%03d] %5lu.%06lu: ",
 540                                 comm, entry->pid, iter->cpu, secs, usec_rem);
 541 }
 542
 543 int trace_print_lat_context(struct trace_iterator *iter)
 544 {
 545         u64 next_ts;
 546         int ret;
 547         struct trace_seq *s = &iter->seq;
 548         struct trace_entry *entry = iter->ent,
 549                            *next_entry = trace_find_next_entry(iter, NULL,
 550                                                                &next_ts);
 551         unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 552         unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 553         unsigned long rel_usecs;
 554
 555         if (!next_entry)
 556                 next_ts = iter->ts;
 557         rel_usecs = ns2usecs(next_ts - iter->ts);
 558
 559         if (verbose) {
 560                 char comm[TASK_COMM_LEN];
 561
 562                 trace_find_cmdline(entry->pid, comm);
 563
 564                 ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 565                                        " %ld.%03ldms (+%ld.%03ldms): ", comm,
 566                                        entry->pid, iter->cpu, entry->flags,
 567                                        entry->preempt_count, iter->idx,
 568                                        ns2usecs(iter->ts),
 569                                        abs_usecs / USEC_PER_MSEC,
 570                                        abs_usecs % USEC_PER_MSEC,
 571                                        rel_usecs / USEC_PER_MSEC,
 572                                        rel_usecs % USEC_PER_MSEC);
 573         } else {
 574                 ret = lat_print_generic(s, entry, iter->cpu);
 575                 if (ret)
 576                         ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 577         }
 578
 579         return ret;
 580 }
 581
 582 static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 583
 584 static int task_state_char(unsigned long state)
 585 {
 586         int bit = state ? __ffs(state) + 1 : 0;
 587
 588         return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 589 }
 590
 591 /**
 592  * ftrace_find_event - find a registered event
 593  * @type: the type of event to look for
 594  *
 595  * Returns an event of type @type otherwise NULL
 596  * Called with trace_event_read_lock() held.
 597  */
 598 struct trace_event *ftrace_find_event(int type)
 599 {
 600         struct trace_event *event;
 601         struct hlist_node *n;
 602         unsigned key;
 603
 604         key = type & (EVENT_HASHSIZE - 1);
 605
 606         hlist_for_each_entry(event, n, &event_hash[key], node) {
 607                 if (event->type == type)
 608                         return event;
 609         }
 610
 611         return NULL;
 612 }
 613
 614 static LIST_HEAD(ftrace_event_list);
 615
 616 static int trace_search_list(struct list_head **list)
 617 {
 618         struct trace_event *e;
 619         int last = __TRACE_LAST_TYPE;
 620
 621         if (list_empty(&ftrace_event_list)) {
 622                 *list = &ftrace_event_list;
 623                 return last + 1;
 624         }
 625
 626         /*
 627          * We used up all possible max events,
 628          * lets see if somebody freed one.
 629          */
 630         list_for_each_entry(e, &ftrace_event_list, list) {
 631                 if (e->type != last + 1)
 632                         break;
 633                 last++;
 634         }
 635
 636         /* Did we used up all 65 thousand events??? */
 637         if ((last + 1) > FTRACE_MAX_EVENT)
 638                 return 0;
 639
 640         *list = &e->list;
 641         return last + 1;
 642 }
 643
 644 void trace_event_read_lock(void)
 645 {
 646         down_read(&trace_event_mutex);
 647 }
 648
 649 void trace_event_read_unlock(void)
 650 {
 651         up_read(&trace_event_mutex);
 652 }
 653
 654 /**
 655  * register_ftrace_event - register output for an event type
 656  * @event: the event type to register
 657  *
 658  * Event types are stored in a hash and this hash is used to
 659  * find a way to print an event. If the @event->type is set
 660  * then it will use that type, otherwise it will assign a
 661  * type to use.
 662  *
 663  * If you assign your own type, please make sure it is added
 664  * to the trace_type enum in trace.h, to avoid collisions
 665  * with the dynamic types.
 666  *
 667  * Returns the event type number or zero on error.
 668  */
 669 int register_ftrace_event(struct trace_event *event)
 670 {
 671         unsigned key;
 672         int ret = 0;
 673
 674         down_write(&trace_event_mutex);
 675
 676         if (WARN_ON(!event))
 677                 goto out;
 678
 679         INIT_LIST_HEAD(&event->list);
 680
 681         if (!event->type) {
 682                 struct list_head *list = NULL;
 683
 684                 if (next_event_type > FTRACE_MAX_EVENT) {
 685
 686                         event->type = trace_search_list(&list);
 687                         if (!event->type)
 688                                 goto out;
 689
 690                 } else {
 691
 692                         event->type = next_event_type++;
 693                         list = &ftrace_event_list;
 694                 }
 695
 696                 if (WARN_ON(ftrace_find_event(event->type)))
 697                         goto out;
 698
 699                 list_add_tail(&event->list, list);
 700
 701         } else if (event->type > __TRACE_LAST_TYPE) {
 702                 printk(KERN_WARNING "Need to add type to trace.h\n");
 703                 WARN_ON(1);
 704                 goto out;
 705         } else {
 706                 /* Is this event already used */
 707                 if (ftrace_find_event(event->type))
 708                         goto out;
 709         }
 710
 711         if (event->trace == NULL)
 712                 event->trace = trace_nop_print;
 713         if (event->raw == NULL)
 714                 event->raw = trace_nop_print;
 715         if (event->hex == NULL)
 716                 event->hex = trace_nop_print;
 717         if (event->binary == NULL)
 718                 event->binary = trace_nop_print;
 719
 720         key = event->type & (EVENT_HASHSIZE - 1);
 721
 722         hlist_add_head(&event->node, &event_hash[key]);
 723
 724         ret = event->type;
 725  out:
 726         up_write(&trace_event_mutex);
 727
 728         return ret;
 729 }
 730 EXPORT_SYMBOL_GPL(register_ftrace_event);
 731
 732 /*
 733  * Used by module code with the trace_event_mutex held for write.
 734  */
 735 int __unregister_ftrace_event(struct trace_event *event)
 736 {
 737         hlist_del(&event->node);
 738         list_del(&event->list);
 739         return 0;
 740 }
 741
 742 /**
 743  * unregister_ftrace_event - remove a no longer used event
 744  * @event: the event to remove
 745  */
 746 int unregister_ftrace_event(struct trace_event *event)
 747 {
 748         down_write(&trace_event_mutex);
 749         __unregister_ftrace_event(event);
 750         up_write(&trace_event_mutex);
 751
 752         return 0;
 753 }
 754 EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 755
 756 /*
 757  * Standard events
 758  */
 759
 760 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags)
 761 {
 762         return TRACE_TYPE_HANDLED;
 763 }
 764
 765 /* TRACE_FN */
 766 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags)
 767 {
 768         struct ftrace_entry *field;
 769         struct trace_seq *s = &iter->seq;
 770
 771         trace_assign_type(field, iter->ent);
 772
 773         if (!seq_print_ip_sym(s, field->ip, flags))
 774                 goto partial;
 775
 776         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 777                 if (!trace_seq_printf(s, " <-"))
 778                         goto partial;
 779                 if (!seq_print_ip_sym(s,
 780                                       field->parent_ip,
 781                                       flags))
 782                         goto partial;
 783         }
 784         if (!trace_seq_printf(s, "\n"))
 785                 goto partial;
 786
 787         return TRACE_TYPE_HANDLED;
 788
 789  partial:
 790         return TRACE_TYPE_PARTIAL_LINE;
 791 }
 792
 793 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags)
 794 {
 795         struct ftrace_entry *field;
 796
 797         trace_assign_type(field, iter->ent);
 798
 799         if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 800                               field->ip,
 801                               field->parent_ip))
 802                 return TRACE_TYPE_PARTIAL_LINE;
 803
 804         return TRACE_TYPE_HANDLED;
 805 }
 806
 807 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags)
 808 {
 809         struct ftrace_entry *field;
 810         struct trace_seq *s = &iter->seq;
 811
 812         trace_assign_type(field, iter->ent);
 813
 814         SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 815         SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 816
 817         return TRACE_TYPE_HANDLED;
 818 }
 819
 820 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags)
 821 {
 822         struct ftrace_entry *field;
 823         struct trace_seq *s = &iter->seq;
 824
 825         trace_assign_type(field, iter->ent);
 826
 827         SEQ_PUT_FIELD_RET(s, field->ip);
 828         SEQ_PUT_FIELD_RET(s, field->parent_ip);
 829
 830         return TRACE_TYPE_HANDLED;
 831 }
 832
 833 static struct trace_event trace_fn_event = {
 834         .type           = TRACE_FN,
 835         .trace          = trace_fn_trace,
 836         .raw            = trace_fn_raw,
 837         .hex            = trace_fn_hex,
 838         .binary         = trace_fn_bin,
 839 };
 840
 841 /* TRACE_CTX an TRACE_WAKE */
 842 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 843                                              char *delim)
 844 {
 845         struct ctx_switch_entry *field;
 846         char comm[TASK_COMM_LEN];
 847         int S, T;
 848
 849
 850         trace_assign_type(field, iter->ent);
 851
 852         T = task_state_char(field->next_state);
 853         S = task_state_char(field->prev_state);
 854         trace_find_cmdline(field->next_pid, comm);
 855         if (!trace_seq_printf(&iter->seq,
 856                               " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 857                               field->prev_pid,
 858                               field->prev_prio,
 859                               S, delim,
 860                               field->next_cpu,
 861                               field->next_pid,
 862                               field->next_prio,
 863                               T, comm))
 864                 return TRACE_TYPE_PARTIAL_LINE;
 865
 866         return TRACE_TYPE_HANDLED;
 867 }
 868
 869 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags)
 870 {
 871         return trace_ctxwake_print(iter, "==>");
 872 }
 873
 874 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 875                                           int flags)
 876 {
 877         return trace_ctxwake_print(iter, "  +");
 878 }
 879
 880 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 881 {
 882         struct ctx_switch_entry *field;
 883         int T;
 884
 885         trace_assign_type(field, iter->ent);
 886
 887         if (!S)
 888                 S = task_state_char(field->prev_state);
 889         T = task_state_char(field->next_state);
 890         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 891                               field->prev_pid,
 892                               field->prev_prio,
 893                               S,
 894                               field->next_cpu,
 895                               field->next_pid,
 896                               field->next_prio,
 897                               T))
 898                 return TRACE_TYPE_PARTIAL_LINE;
 899
 900         return TRACE_TYPE_HANDLED;
 901 }
 902
 903 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags)
 904 {
 905         return trace_ctxwake_raw(iter, 0);
 906 }
 907
 908 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags)
 909 {
 910         return trace_ctxwake_raw(iter, '+');
 911 }
 912
 913
 914 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 915 {
 916         struct ctx_switch_entry *field;
 917         struct trace_seq *s = &iter->seq;
 918         int T;
 919
 920         trace_assign_type(field, iter->ent);
 921
 922         if (!S)
 923                 S = task_state_char(field->prev_state);
 924         T = task_state_char(field->next_state);
 925
 926         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
 927         SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
 928         SEQ_PUT_HEX_FIELD_RET(s, S);
 929         SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
 930         SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
 931         SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
 932         SEQ_PUT_HEX_FIELD_RET(s, T);
 933
 934         return TRACE_TYPE_HANDLED;
 935 }
 936
 937 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags)
 938 {
 939         return trace_ctxwake_hex(iter, 0);
 940 }
 941
 942 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags)
 943 {
 944         return trace_ctxwake_hex(iter, '+');
 945 }
 946
 947 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
 948                                            int flags)
 949 {
 950         struct ctx_switch_entry *field;
 951         struct trace_seq *s = &iter->seq;
 952
 953         trace_assign_type(field, iter->ent);
 954
 955         SEQ_PUT_FIELD_RET(s, field->prev_pid);
 956         SEQ_PUT_FIELD_RET(s, field->prev_prio);
 957         SEQ_PUT_FIELD_RET(s, field->prev_state);
 958         SEQ_PUT_FIELD_RET(s, field->next_pid);
 959         SEQ_PUT_FIELD_RET(s, field->next_prio);
 960         SEQ_PUT_FIELD_RET(s, field->next_state);
 961
 962         return TRACE_TYPE_HANDLED;
 963 }
 964
 965 static struct trace_event trace_ctx_event = {
 966         .type           = TRACE_CTX,
 967         .trace          = trace_ctx_print,
 968         .raw            = trace_ctx_raw,
 969         .hex            = trace_ctx_hex,
 970         .binary         = trace_ctxwake_bin,
 971 };
 972
 973 static struct trace_event trace_wake_event = {
 974         .type           = TRACE_WAKE,
 975         .trace          = trace_wake_print,
 976         .raw            = trace_wake_raw,
 977         .hex            = trace_wake_hex,
 978         .binary         = trace_ctxwake_bin,
 979 };
 980
 981 /* TRACE_SPECIAL */
 982 static enum print_line_t trace_special_print(struct trace_iterator *iter,
 983                                              int flags)
 984 {
 985         struct special_entry *field;
 986
 987         trace_assign_type(field, iter->ent);
 988
 989         if (!trace_seq_printf(&iter->seq, "# %ld %ld %ld\n",
 990                               field->arg1,
 991                               field->arg2,
 992                               field->arg3))
 993                 return TRACE_TYPE_PARTIAL_LINE;
 994
 995         return TRACE_TYPE_HANDLED;
 996 }
 997
 998 static enum print_line_t trace_special_hex(struct trace_iterator *iter,
 999                                            int flags)
1000 {
1001         struct special_entry *field;
1002         struct trace_seq *s = &iter->seq;
1003
1004         trace_assign_type(field, iter->ent);
1005
1006         SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
1007         SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
1008         SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
1009
1010         return TRACE_TYPE_HANDLED;
1011 }
1012
1013 static enum print_line_t trace_special_bin(struct trace_iterator *iter,
1014                                            int flags)
1015 {
1016         struct special_entry *field;
1017         struct trace_seq *s = &iter->seq;
1018
1019         trace_assign_type(field, iter->ent);
1020
1021         SEQ_PUT_FIELD_RET(s, field->arg1);
1022         SEQ_PUT_FIELD_RET(s, field->arg2);
1023         SEQ_PUT_FIELD_RET(s, field->arg3);
1024
1025         return TRACE_TYPE_HANDLED;
1026 }
1027
1028 static struct trace_event trace_special_event = {
1029         .type           = TRACE_SPECIAL,
1030         .trace          = trace_special_print,
1031         .raw            = trace_special_print,
1032         .hex            = trace_special_hex,
1033         .binary         = trace_special_bin,
1034 };
1035
1036 /* TRACE_STACK */
1037
1038 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1039                                            int flags)
1040 {
1041         struct stack_entry *field;
1042         struct trace_seq *s = &iter->seq;
1043         int i;
1044
1045         trace_assign_type(field, iter->ent);
1046
1047         if (!trace_seq_puts(s, "<stack trace>\n"))
1048                 goto partial;
1049         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1050                 if (!field->caller[i] || (field->caller[i] == ULONG_MAX))
1051                         break;
1052                 if (!trace_seq_puts(s, " => "))
1053                         goto partial;
1054
1055                 if (!seq_print_ip_sym(s, field->caller[i], flags))
1056                         goto partial;
1057                 if (!trace_seq_puts(s, "\n"))
1058                         goto partial;
1059         }
1060
1061         return TRACE_TYPE_HANDLED;
1062
1063  partial:
1064         return TRACE_TYPE_PARTIAL_LINE;
1065 }
1066
1067 static struct trace_event trace_stack_event = {
1068         .type           = TRACE_STACK,
1069         .trace          = trace_stack_print,
1070         .raw            = trace_special_print,
1071         .hex            = trace_special_hex,
1072         .binary         = trace_special_bin,
1073 };
1074
1075 /* TRACE_USER_STACK */
1076 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1077                                                 int flags)
1078 {
1079         struct userstack_entry *field;
1080         struct trace_seq *s = &iter->seq;
1081
1082         trace_assign_type(field, iter->ent);
1083
1084         if (!trace_seq_puts(s, "<user stack trace>\n"))
1085                 goto partial;
1086
1087         if (!seq_print_userip_objs(field, s, flags))
1088                 goto partial;
1089
1090         return TRACE_TYPE_HANDLED;
1091
1092  partial:
1093         return TRACE_TYPE_PARTIAL_LINE;
1094 }
1095
1096 static struct trace_event trace_user_stack_event = {
1097         .type           = TRACE_USER_STACK,
1098         .trace          = trace_user_stack_print,
1099         .raw            = trace_special_print,
1100         .hex            = trace_special_hex,
1101         .binary         = trace_special_bin,
1102 };
1103
1104 /* TRACE_BPRINT */
1105 static enum print_line_t
1106 trace_bprint_print(struct trace_iterator *iter, int flags)
1107 {
1108         struct trace_entry *entry = iter->ent;
1109         struct trace_seq *s = &iter->seq;
1110         struct bprint_entry *field;
1111
1112         trace_assign_type(field, entry);
1113
1114         if (!seq_print_ip_sym(s, field->ip, flags))
1115                 goto partial;
1116
1117         if (!trace_seq_puts(s, ": "))
1118                 goto partial;
1119
1120         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1121                 goto partial;
1122
1123         return TRACE_TYPE_HANDLED;
1124
1125  partial:
1126         return TRACE_TYPE_PARTIAL_LINE;
1127 }
1128
1129
1130 static enum print_line_t
1131 trace_bprint_raw(struct trace_iterator *iter, int flags)
1132 {
1133         struct bprint_entry *field;
1134         struct trace_seq *s = &iter->seq;
1135
1136         trace_assign_type(field, iter->ent);
1137
1138         if (!trace_seq_printf(s, ": %lx : ", field->ip))
1139                 goto partial;
1140
1141         if (!trace_seq_bprintf(s, field->fmt, field->buf))
1142                 goto partial;
1143
1144         return TRACE_TYPE_HANDLED;
1145
1146  partial:
1147         return TRACE_TYPE_PARTIAL_LINE;
1148 }
1149
1150
1151 static struct trace_event trace_bprint_event = {
1152         .type           = TRACE_BPRINT,
1153         .trace          = trace_bprint_print,
1154         .raw            = trace_bprint_raw,
1155 };
1156
1157 /* TRACE_PRINT */
1158 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1159                                            int flags)
1160 {
1161         struct print_entry *field;
1162         struct trace_seq *s = &iter->seq;
1163
1164         trace_assign_type(field, iter->ent);
1165
1166         if (!seq_print_ip_sym(s, field->ip, flags))
1167                 goto partial;
1168
1169         if (!trace_seq_printf(s, ": %s", field->buf))
1170                 goto partial;
1171
1172         return TRACE_TYPE_HANDLED;
1173
1174  partial:
1175         return TRACE_TYPE_PARTIAL_LINE;
1176 }
1177
1178 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags)
1179 {
1180         struct print_entry *field;
1181
1182         trace_assign_type(field, iter->ent);
1183
1184         if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1185                 goto partial;
1186
1187         return TRACE_TYPE_HANDLED;
1188
1189  partial:
1190         return TRACE_TYPE_PARTIAL_LINE;
1191 }
1192
1193 static struct trace_event trace_print_event = {
1194         .type           = TRACE_PRINT,
1195         .trace          = trace_print_print,
1196         .raw            = trace_print_raw,
1197 };
1198
1199
1200 static struct trace_event *events[] __initdata = {
1201         &trace_fn_event,
1202         &trace_ctx_event,
1203         &trace_wake_event,
1204         &trace_special_event,
1205         &trace_stack_event,
1206         &trace_user_stack_event,
1207         &trace_bprint_event,
1208         &trace_print_event,
1209         NULL
1210 };
1211
1212 __init static int init_events(void)
1213 {
1214         struct trace_event *event;
1215         int i, ret;
1216
1217         for (i = 0; events[i]; i++) {
1218                 event = events[i];
1219
1220                 ret = register_ftrace_event(event);
1221                 if (!ret) {
1222                         printk(KERN_WARNING "event %d failed to register\n",
1223                                event->type);
1224                         WARN_ON_ONCE(1);
1225                 }
1226         }
1227
1228         return 0;
1229 }
1230 device_initcall(init_events);