kernel/trace/trace_output.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * trace_output.c
   4  *
   5  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   6  *
   7  */
   8 #include <linux/module.h>
   9 #include <linux/mutex.h>
  10 #include <linux/ftrace.h>
  11 #include <linux/kprobes.h>
  12 #include <linux/sched/clock.h>
  13 #include <linux/sched/mm.h>
  14
  15 #include "trace_output.h"
  16
  17 /* must be a power of 2 */
  18 #define EVENT_HASHSIZE  128
  19
  20 DECLARE_RWSEM(trace_event_sem);
  21
  22 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  23
  24 static int next_event_type = __TRACE_LAST_TYPE;
  25
  26 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
  27 {
  28         struct trace_seq *s = &iter->seq;
  29         struct trace_entry *entry = iter->ent;
  30         struct bputs_entry *field;
  31
  32         trace_assign_type(field, entry);
  33
  34         trace_seq_puts(s, field->str);
  35
  36         return trace_handle_return(s);
  37 }
  38
  39 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  40 {
  41         struct trace_seq *s = &iter->seq;
  42         struct trace_entry *entry = iter->ent;
  43         struct bprint_entry *field;
  44
  45         trace_assign_type(field, entry);
  46
  47         trace_seq_bprintf(s, field->fmt, field->buf);
  48
  49         return trace_handle_return(s);
  50 }
  51
  52 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  53 {
  54         struct trace_seq *s = &iter->seq;
  55         struct trace_entry *entry = iter->ent;
  56         struct print_entry *field;
  57
  58         trace_assign_type(field, entry);
  59
  60         trace_seq_puts(s, field->buf);
  61
  62         return trace_handle_return(s);
  63 }
  64
  65 const char *
  66 trace_print_flags_seq(struct trace_seq *p, const char *delim,
  67                       unsigned long flags,
  68                       const struct trace_print_flags *flag_array)
  69 {
  70         unsigned long mask;
  71         const char *str;
  72         const char *ret = trace_seq_buffer_ptr(p);
  73         int i, first = 1;
  74
  75         for (i = 0;  flag_array[i].name && flags; i++) {
  76
  77                 mask = flag_array[i].mask;
  78                 if ((flags & mask) != mask)
  79                         continue;
  80
  81                 str = flag_array[i].name;
  82                 flags &= ~mask;
  83                 if (!first && delim)
  84                         trace_seq_puts(p, delim);
  85                 else
  86                         first = 0;
  87                 trace_seq_puts(p, str);
  88         }
  89
  90         /* check for left over flags */
  91         if (flags) {
  92                 if (!first && delim)
  93                         trace_seq_puts(p, delim);
  94                 trace_seq_printf(p, "0x%lx", flags);
  95         }
  96
  97         trace_seq_putc(p, 0);
  98
  99         return ret;
 100 }
 101 EXPORT_SYMBOL(trace_print_flags_seq);
 102
 103 const char *
 104 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 105                         const struct trace_print_flags *symbol_array)
 106 {
 107         int i;
 108         const char *ret = trace_seq_buffer_ptr(p);
 109
 110         for (i = 0;  symbol_array[i].name; i++) {
 111
 112                 if (val != symbol_array[i].mask)
 113                         continue;
 114
 115                 trace_seq_puts(p, symbol_array[i].name);
 116                 break;
 117         }
 118
 119         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 120                 trace_seq_printf(p, "0x%lx", val);
 121
 122         trace_seq_putc(p, 0);
 123
 124         return ret;
 125 }
 126 EXPORT_SYMBOL(trace_print_symbols_seq);
 127
 128 #if BITS_PER_LONG == 32
 129 const char *
 130 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
 131                       unsigned long long flags,
 132                       const struct trace_print_flags_u64 *flag_array)
 133 {
 134         unsigned long long mask;
 135         const char *str;
 136         const char *ret = trace_seq_buffer_ptr(p);
 137         int i, first = 1;
 138
 139         for (i = 0;  flag_array[i].name && flags; i++) {
 140
 141                 mask = flag_array[i].mask;
 142                 if ((flags & mask) != mask)
 143                         continue;
 144
 145                 str = flag_array[i].name;
 146                 flags &= ~mask;
 147                 if (!first && delim)
 148                         trace_seq_puts(p, delim);
 149                 else
 150                         first = 0;
 151                 trace_seq_puts(p, str);
 152         }
 153
 154         /* check for left over flags */
 155         if (flags) {
 156                 if (!first && delim)
 157                         trace_seq_puts(p, delim);
 158                 trace_seq_printf(p, "0x%llx", flags);
 159         }
 160
 161         trace_seq_putc(p, 0);
 162
 163         return ret;
 164 }
 165 EXPORT_SYMBOL(trace_print_flags_seq_u64);
 166
 167 const char *
 168 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 169                          const struct trace_print_flags_u64 *symbol_array)
 170 {
 171         int i;
 172         const char *ret = trace_seq_buffer_ptr(p);
 173
 174         for (i = 0;  symbol_array[i].name; i++) {
 175
 176                 if (val != symbol_array[i].mask)
 177                         continue;
 178
 179                 trace_seq_puts(p, symbol_array[i].name);
 180                 break;
 181         }
 182
 183         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 184                 trace_seq_printf(p, "0x%llx", val);
 185
 186         trace_seq_putc(p, 0);
 187
 188         return ret;
 189 }
 190 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
 191 #endif
 192
 193 const char *
 194 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
 195                         unsigned int bitmask_size)
 196 {
 197         const char *ret = trace_seq_buffer_ptr(p);
 198
 199         trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
 200         trace_seq_putc(p, 0);
 201
 202         return ret;
 203 }
 204 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
 205
 206 /**
 207  * trace_print_hex_seq - print buffer as hex sequence
 208  * @p: trace seq struct to write to
 209  * @buf: The buffer to print
 210  * @buf_len: Length of @buf in bytes
 211  * @concatenate: Print @buf as single hex string or with spacing
 212  *
 213  * Prints the passed buffer as a hex sequence either as a whole,
 214  * single hex string if @concatenate is true or with spacing after
 215  * each byte in case @concatenate is false.
 216  */
 217 const char *
 218 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
 219                     bool concatenate)
 220 {
 221         int i;
 222         const char *ret = trace_seq_buffer_ptr(p);
 223         const char *fmt = concatenate ? "%*phN" : "%*ph";
 224
 225         for (i = 0; i < buf_len; i += 16)
 226                 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
 227         trace_seq_putc(p, 0);
 228
 229         return ret;
 230 }
 231 EXPORT_SYMBOL(trace_print_hex_seq);
 232
 233 const char *
 234 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
 235                       size_t el_size)
 236 {
 237         const char *ret = trace_seq_buffer_ptr(p);
 238         const char *prefix = "";
 239         void *ptr = (void *)buf;
 240         size_t buf_len = count * el_size;
 241
 242         trace_seq_putc(p, '{');
 243
 244         while (ptr < buf + buf_len) {
 245                 switch (el_size) {
 246                 case 1:
 247                         trace_seq_printf(p, "%s0x%x", prefix,
 248                                          *(u8 *)ptr);
 249                         break;
 250                 case 2:
 251                         trace_seq_printf(p, "%s0x%x", prefix,
 252                                          *(u16 *)ptr);
 253                         break;
 254                 case 4:
 255                         trace_seq_printf(p, "%s0x%x", prefix,
 256                                          *(u32 *)ptr);
 257                         break;
 258                 case 8:
 259                         trace_seq_printf(p, "%s0x%llx", prefix,
 260                                          *(u64 *)ptr);
 261                         break;
 262                 default:
 263                         trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
 264                                          *(u8 *)ptr);
 265                         el_size = 1;
 266                 }
 267                 prefix = ",";
 268                 ptr += el_size;
 269         }
 270
 271         trace_seq_putc(p, '}');
 272         trace_seq_putc(p, 0);
 273
 274         return ret;
 275 }
 276 EXPORT_SYMBOL(trace_print_array_seq);
 277
 278 const char *
 279 trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
 280                          int prefix_type, int rowsize, int groupsize,
 281                          const void *buf, size_t len, bool ascii)
 282 {
 283         const char *ret = trace_seq_buffer_ptr(p);
 284
 285         trace_seq_putc(p, '\n');
 286         trace_seq_hex_dump(p, prefix_str, prefix_type,
 287                            rowsize, groupsize, buf, len, ascii);
 288         trace_seq_putc(p, 0);
 289         return ret;
 290 }
 291 EXPORT_SYMBOL(trace_print_hex_dump_seq);
 292
 293 int trace_raw_output_prep(struct trace_iterator *iter,
 294                           struct trace_event *trace_event)
 295 {
 296         struct trace_event_call *event;
 297         struct trace_seq *s = &iter->seq;
 298         struct trace_seq *p = &iter->tmp_seq;
 299         struct trace_entry *entry;
 300
 301         event = container_of(trace_event, struct trace_event_call, event);
 302         entry = iter->ent;
 303
 304         if (entry->type != event->event.type) {
 305                 WARN_ON_ONCE(1);
 306                 return TRACE_TYPE_UNHANDLED;
 307         }
 308
 309         trace_seq_init(p);
 310         trace_seq_printf(s, "%s: ", trace_event_name(event));
 311
 312         return trace_handle_return(s);
 313 }
 314 EXPORT_SYMBOL(trace_raw_output_prep);
 315
 316 void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
 317 {
 318         va_list ap;
 319
 320         va_start(ap, fmt);
 321         trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
 322         va_end(ap);
 323 }
 324 EXPORT_SYMBOL(trace_event_printf);
 325
 326 static int trace_output_raw(struct trace_iterator *iter, char *name,
 327                             char *fmt, va_list ap)
 328 {
 329         struct trace_seq *s = &iter->seq;
 330
 331         trace_seq_printf(s, "%s: ", name);
 332         trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
 333
 334         return trace_handle_return(s);
 335 }
 336
 337 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 338 {
 339         va_list ap;
 340         int ret;
 341
 342         va_start(ap, fmt);
 343         ret = trace_output_raw(iter, name, fmt, ap);
 344         va_end(ap);
 345
 346         return ret;
 347 }
 348 EXPORT_SYMBOL_GPL(trace_output_call);
 349
 350 static inline const char *kretprobed(const char *name, unsigned long addr)
 351 {
 352         if (is_kretprobe_trampoline(addr))
 353                 return "[unknown/kretprobe'd]";
 354         return name;
 355 }
 356
 357 void
 358 trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
 359 {
 360 #ifdef CONFIG_KALLSYMS
 361         char str[KSYM_SYMBOL_LEN];
 362         const char *name;
 363
 364         if (offset)
 365                 sprint_symbol(str, address);
 366         else
 367                 kallsyms_lookup(address, NULL, NULL, NULL, str);
 368         name = kretprobed(str, address);
 369
 370         if (name && strlen(name)) {
 371                 trace_seq_puts(s, name);
 372                 return;
 373         }
 374 #endif
 375         trace_seq_printf(s, "0x%08lx", address);
 376 }
 377
 378 #ifndef CONFIG_64BIT
 379 # define IP_FMT "%08lx"
 380 #else
 381 # define IP_FMT "%016lx"
 382 #endif
 383
 384 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 385                              unsigned long ip, unsigned long sym_flags)
 386 {
 387         struct file *file = NULL;
 388         unsigned long vmstart = 0;
 389         int ret = 1;
 390
 391         if (s->full)
 392                 return 0;
 393
 394         if (mm) {
 395                 const struct vm_area_struct *vma;
 396
 397                 mmap_read_lock(mm);
 398                 vma = find_vma(mm, ip);
 399                 if (vma) {
 400                         file = vma->vm_file;
 401                         vmstart = vma->vm_start;
 402                 }
 403                 if (file) {
 404                         ret = trace_seq_path(s, &file->f_path);
 405                         if (ret)
 406                                 trace_seq_printf(s, "[+0x%lx]",
 407                                                  ip - vmstart);
 408                 }
 409                 mmap_read_unlock(mm);
 410         }
 411         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 412                 trace_seq_printf(s, " <" IP_FMT ">", ip);
 413         return !trace_seq_has_overflowed(s);
 414 }
 415
 416 int
 417 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 418 {
 419         if (!ip) {
 420                 trace_seq_putc(s, '0');
 421                 goto out;
 422         }
 423
 424         trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
 425
 426         if (sym_flags & TRACE_ITER_SYM_ADDR)
 427                 trace_seq_printf(s, " <" IP_FMT ">", ip);
 428
 429  out:
 430         return !trace_seq_has_overflowed(s);
 431 }
 432
 433 /**
 434  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 435  * @s: trace seq struct to write to
 436  * @entry: The trace entry field from the ring buffer
 437  *
 438  * Prints the generic fields of irqs off, in hard or softirq, preempt
 439  * count.
 440  */
 441 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 442 {
 443         char hardsoft_irq;
 444         char need_resched;
 445         char irqs_off;
 446         int hardirq;
 447         int softirq;
 448         int nmi;
 449
 450         nmi = entry->flags & TRACE_FLAG_NMI;
 451         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 452         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 453
 454         irqs_off =
 455                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 456                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 457                 '.';
 458
 459         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 460                                 TRACE_FLAG_PREEMPT_RESCHED)) {
 461         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 462                 need_resched = 'N';
 463                 break;
 464         case TRACE_FLAG_NEED_RESCHED:
 465                 need_resched = 'n';
 466                 break;
 467         case TRACE_FLAG_PREEMPT_RESCHED:
 468                 need_resched = 'p';
 469                 break;
 470         default:
 471                 need_resched = '.';
 472                 break;
 473         }
 474
 475         hardsoft_irq =
 476                 (nmi && hardirq)     ? 'Z' :
 477                 nmi                  ? 'z' :
 478                 (hardirq && softirq) ? 'H' :
 479                 hardirq              ? 'h' :
 480                 softirq              ? 's' :
 481                                        '.' ;
 482
 483         trace_seq_printf(s, "%c%c%c",
 484                          irqs_off, need_resched, hardsoft_irq);
 485
 486         if (entry->preempt_count & 0xf)
 487                 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
 488         else
 489                 trace_seq_putc(s, '.');
 490
 491         if (entry->preempt_count & 0xf0)
 492                 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
 493         else
 494                 trace_seq_putc(s, '.');
 495
 496         return !trace_seq_has_overflowed(s);
 497 }
 498
 499 static int
 500 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 501 {
 502         char comm[TASK_COMM_LEN];
 503
 504         trace_find_cmdline(entry->pid, comm);
 505
 506         trace_seq_printf(s, "%8.8s-%-7d %3d",
 507                          comm, entry->pid, cpu);
 508
 509         return trace_print_lat_fmt(s, entry);
 510 }
 511
 512 #undef MARK
 513 #define MARK(v, s) {.val = v, .sym = s}
 514 /* trace overhead mark */
 515 static const struct trace_mark {
 516         unsigned long long      val; /* unit: nsec */
 517         char                    sym;
 518 } mark[] = {
 519         MARK(1000000000ULL      , '$'), /* 1 sec */
 520         MARK(100000000ULL       , '@'), /* 100 msec */
 521         MARK(10000000ULL        , '*'), /* 10 msec */
 522         MARK(1000000ULL         , '#'), /* 1000 usecs */
 523         MARK(100000ULL          , '!'), /* 100 usecs */
 524         MARK(10000ULL           , '+'), /* 10 usecs */
 525 };
 526 #undef MARK
 527
 528 char trace_find_mark(unsigned long long d)
 529 {
 530         int i;
 531         int size = ARRAY_SIZE(mark);
 532
 533         for (i = 0; i < size; i++) {
 534                 if (d > mark[i].val)
 535                         break;
 536         }
 537
 538         return (i == size) ? ' ' : mark[i].sym;
 539 }
 540
 541 static int
 542 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 543 {
 544         struct trace_array *tr = iter->tr;
 545         unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 546         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 547         unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
 548         unsigned long long rel_ts = next_ts - iter->ts;
 549         struct trace_seq *s = &iter->seq;
 550
 551         if (in_ns) {
 552                 abs_ts = ns2usecs(abs_ts);
 553                 rel_ts = ns2usecs(rel_ts);
 554         }
 555
 556         if (verbose && in_ns) {
 557                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 558                 unsigned long abs_msec = (unsigned long)abs_ts;
 559                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 560                 unsigned long rel_msec = (unsigned long)rel_ts;
 561
 562                 trace_seq_printf(
 563                         s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 564                         ns2usecs(iter->ts),
 565                         abs_msec, abs_usec,
 566                         rel_msec, rel_usec);
 567
 568         } else if (verbose && !in_ns) {
 569                 trace_seq_printf(
 570                         s, "[%016llx] %lld (+%lld): ",
 571                         iter->ts, abs_ts, rel_ts);
 572
 573         } else if (!verbose && in_ns) {
 574                 trace_seq_printf(
 575                         s, " %4lldus%c: ",
 576                         abs_ts,
 577                         trace_find_mark(rel_ts * NSEC_PER_USEC));
 578
 579         } else { /* !verbose && !in_ns */
 580                 trace_seq_printf(s, " %4lld: ", abs_ts);
 581         }
 582
 583         return !trace_seq_has_overflowed(s);
 584 }
 585
 586 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
 587                              unsigned long long ts)
 588 {
 589         unsigned long secs, usec_rem;
 590         unsigned long long t;
 591
 592         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 593                 t = ns2usecs(ts);
 594                 usec_rem = do_div(t, USEC_PER_SEC);
 595                 secs = (unsigned long)t;
 596                 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
 597         } else
 598                 trace_seq_printf(s, " %12llu", ts);
 599 }
 600
 601 int trace_print_context(struct trace_iterator *iter)
 602 {
 603         struct trace_array *tr = iter->tr;
 604         struct trace_seq *s = &iter->seq;
 605         struct trace_entry *entry = iter->ent;
 606         char comm[TASK_COMM_LEN];
 607
 608         trace_find_cmdline(entry->pid, comm);
 609
 610         trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
 611
 612         if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
 613                 unsigned int tgid = trace_find_tgid(entry->pid);
 614
 615                 if (!tgid)
 616                         trace_seq_printf(s, "(-------) ");
 617                 else
 618                         trace_seq_printf(s, "(%7d) ", tgid);
 619         }
 620
 621         trace_seq_printf(s, "[%03d] ", iter->cpu);
 622
 623         if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 624                 trace_print_lat_fmt(s, entry);
 625
 626         trace_print_time(s, iter, iter->ts);
 627         trace_seq_puts(s, ": ");
 628
 629         return !trace_seq_has_overflowed(s);
 630 }
 631
 632 int trace_print_lat_context(struct trace_iterator *iter)
 633 {
 634         struct trace_entry *entry, *next_entry;
 635         struct trace_array *tr = iter->tr;
 636         struct trace_seq *s = &iter->seq;
 637         unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 638         u64 next_ts;
 639
 640         next_entry = trace_find_next_entry(iter, NULL, &next_ts);
 641         if (!next_entry)
 642                 next_ts = iter->ts;
 643
 644         /* trace_find_next_entry() may change iter->ent */
 645         entry = iter->ent;
 646
 647         if (verbose) {
 648                 char comm[TASK_COMM_LEN];
 649
 650                 trace_find_cmdline(entry->pid, comm);
 651
 652                 trace_seq_printf(
 653                         s, "%16s %7d %3d %d %08x %08lx ",
 654                         comm, entry->pid, iter->cpu, entry->flags,
 655                         entry->preempt_count & 0xf, iter->idx);
 656         } else {
 657                 lat_print_generic(s, entry, iter->cpu);
 658         }
 659
 660         lat_print_timestamp(iter, next_ts);
 661
 662         return !trace_seq_has_overflowed(s);
 663 }
 664
 665 /**
 666  * ftrace_find_event - find a registered event
 667  * @type: the type of event to look for
 668  *
 669  * Returns an event of type @type otherwise NULL
 670  * Called with trace_event_read_lock() held.
 671  */
 672 struct trace_event *ftrace_find_event(int type)
 673 {
 674         struct trace_event *event;
 675         unsigned key;
 676
 677         key = type & (EVENT_HASHSIZE - 1);
 678
 679         hlist_for_each_entry(event, &event_hash[key], node) {
 680                 if (event->type == type)
 681                         return event;
 682         }
 683
 684         return NULL;
 685 }
 686
 687 static LIST_HEAD(ftrace_event_list);
 688
 689 static int trace_search_list(struct list_head **list)
 690 {
 691         struct trace_event *e;
 692         int next = __TRACE_LAST_TYPE;
 693
 694         if (list_empty(&ftrace_event_list)) {
 695                 *list = &ftrace_event_list;
 696                 return next;
 697         }
 698
 699         /*
 700          * We used up all possible max events,
 701          * lets see if somebody freed one.
 702          */
 703         list_for_each_entry(e, &ftrace_event_list, list) {
 704                 if (e->type != next)
 705                         break;
 706                 next++;
 707         }
 708
 709         /* Did we used up all 65 thousand events??? */
 710         if (next > TRACE_EVENT_TYPE_MAX)
 711                 return 0;
 712
 713         *list = &e->list;
 714         return next;
 715 }
 716
 717 void trace_event_read_lock(void)
 718 {
 719         down_read(&trace_event_sem);
 720 }
 721
 722 void trace_event_read_unlock(void)
 723 {
 724         up_read(&trace_event_sem);
 725 }
 726
 727 /**
 728  * register_trace_event - register output for an event type
 729  * @event: the event type to register
 730  *
 731  * Event types are stored in a hash and this hash is used to
 732  * find a way to print an event. If the @event->type is set
 733  * then it will use that type, otherwise it will assign a
 734  * type to use.
 735  *
 736  * If you assign your own type, please make sure it is added
 737  * to the trace_type enum in trace.h, to avoid collisions
 738  * with the dynamic types.
 739  *
 740  * Returns the event type number or zero on error.
 741  */
 742 int register_trace_event(struct trace_event *event)
 743 {
 744         unsigned key;
 745         int ret = 0;
 746
 747         down_write(&trace_event_sem);
 748
 749         if (WARN_ON(!event))
 750                 goto out;
 751
 752         if (WARN_ON(!event->funcs))
 753                 goto out;
 754
 755         INIT_LIST_HEAD(&event->list);
 756
 757         if (!event->type) {
 758                 struct list_head *list = NULL;
 759
 760                 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
 761
 762                         event->type = trace_search_list(&list);
 763                         if (!event->type)
 764                                 goto out;
 765
 766                 } else {
 767
 768                         event->type = next_event_type++;
 769                         list = &ftrace_event_list;
 770                 }
 771
 772                 if (WARN_ON(ftrace_find_event(event->type)))
 773                         goto out;
 774
 775                 list_add_tail(&event->list, list);
 776
 777         } else if (event->type > __TRACE_LAST_TYPE) {
 778                 printk(KERN_WARNING "Need to add type to trace.h\n");
 779                 WARN_ON(1);
 780                 goto out;
 781         } else {
 782                 /* Is this event already used */
 783                 if (ftrace_find_event(event->type))
 784                         goto out;
 785         }
 786
 787         if (event->funcs->trace == NULL)
 788                 event->funcs->trace = trace_nop_print;
 789         if (event->funcs->raw == NULL)
 790                 event->funcs->raw = trace_nop_print;
 791         if (event->funcs->hex == NULL)
 792                 event->funcs->hex = trace_nop_print;
 793         if (event->funcs->binary == NULL)
 794                 event->funcs->binary = trace_nop_print;
 795
 796         key = event->type & (EVENT_HASHSIZE - 1);
 797
 798         hlist_add_head(&event->node, &event_hash[key]);
 799
 800         ret = event->type;
 801  out:
 802         up_write(&trace_event_sem);
 803
 804         return ret;
 805 }
 806 EXPORT_SYMBOL_GPL(register_trace_event);
 807
 808 /*
 809  * Used by module code with the trace_event_sem held for write.
 810  */
 811 int __unregister_trace_event(struct trace_event *event)
 812 {
 813         hlist_del(&event->node);
 814         list_del(&event->list);
 815         return 0;
 816 }
 817
 818 /**
 819  * unregister_trace_event - remove a no longer used event
 820  * @event: the event to remove
 821  */
 822 int unregister_trace_event(struct trace_event *event)
 823 {
 824         down_write(&trace_event_sem);
 825         __unregister_trace_event(event);
 826         up_write(&trace_event_sem);
 827
 828         return 0;
 829 }
 830 EXPORT_SYMBOL_GPL(unregister_trace_event);
 831
 832 /*
 833  * Standard events
 834  */
 835
 836 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 837                                   struct trace_event *event)
 838 {
 839         trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
 840
 841         return trace_handle_return(&iter->seq);
 842 }
 843
 844 static void print_fn_trace(struct trace_seq *s, unsigned long ip,
 845                            unsigned long parent_ip, int flags)
 846 {
 847         seq_print_ip_sym(s, ip, flags);
 848
 849         if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
 850                 trace_seq_puts(s, " <-");
 851                 seq_print_ip_sym(s, parent_ip, flags);
 852         }
 853 }
 854
 855 /* TRACE_FN */
 856 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 857                                         struct trace_event *event)
 858 {
 859         struct ftrace_entry *field;
 860         struct trace_seq *s = &iter->seq;
 861
 862         trace_assign_type(field, iter->ent);
 863
 864         print_fn_trace(s, field->ip, field->parent_ip, flags);
 865         trace_seq_putc(s, '\n');
 866
 867         return trace_handle_return(s);
 868 }
 869
 870 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 871                                       struct trace_event *event)
 872 {
 873         struct ftrace_entry *field;
 874
 875         trace_assign_type(field, iter->ent);
 876
 877         trace_seq_printf(&iter->seq, "%lx %lx\n",
 878                          field->ip,
 879                          field->parent_ip);
 880
 881         return trace_handle_return(&iter->seq);
 882 }
 883
 884 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
 885                                       struct trace_event *event)
 886 {
 887         struct ftrace_entry *field;
 888         struct trace_seq *s = &iter->seq;
 889
 890         trace_assign_type(field, iter->ent);
 891
 892         SEQ_PUT_HEX_FIELD(s, field->ip);
 893         SEQ_PUT_HEX_FIELD(s, field->parent_ip);
 894
 895         return trace_handle_return(s);
 896 }
 897
 898 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
 899                                       struct trace_event *event)
 900 {
 901         struct ftrace_entry *field;
 902         struct trace_seq *s = &iter->seq;
 903
 904         trace_assign_type(field, iter->ent);
 905
 906         SEQ_PUT_FIELD(s, field->ip);
 907         SEQ_PUT_FIELD(s, field->parent_ip);
 908
 909         return trace_handle_return(s);
 910 }
 911
 912 static struct trace_event_functions trace_fn_funcs = {
 913         .trace          = trace_fn_trace,
 914         .raw            = trace_fn_raw,
 915         .hex            = trace_fn_hex,
 916         .binary         = trace_fn_bin,
 917 };
 918
 919 static struct trace_event trace_fn_event = {
 920         .type           = TRACE_FN,
 921         .funcs          = &trace_fn_funcs,
 922 };
 923
 924 /* TRACE_CTX an TRACE_WAKE */
 925 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 926                                              char *delim)
 927 {
 928         struct ctx_switch_entry *field;
 929         char comm[TASK_COMM_LEN];
 930         int S, T;
 931
 932
 933         trace_assign_type(field, iter->ent);
 934
 935         T = task_index_to_char(field->next_state);
 936         S = task_index_to_char(field->prev_state);
 937         trace_find_cmdline(field->next_pid, comm);
 938         trace_seq_printf(&iter->seq,
 939                          " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
 940                          field->prev_pid,
 941                          field->prev_prio,
 942                          S, delim,
 943                          field->next_cpu,
 944                          field->next_pid,
 945                          field->next_prio,
 946                          T, comm);
 947
 948         return trace_handle_return(&iter->seq);
 949 }
 950
 951 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
 952                                          struct trace_event *event)
 953 {
 954         return trace_ctxwake_print(iter, "==>");
 955 }
 956
 957 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 958                                           int flags, struct trace_event *event)
 959 {
 960         return trace_ctxwake_print(iter, "  +");
 961 }
 962
 963 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 964 {
 965         struct ctx_switch_entry *field;
 966         int T;
 967
 968         trace_assign_type(field, iter->ent);
 969
 970         if (!S)
 971                 S = task_index_to_char(field->prev_state);
 972         T = task_index_to_char(field->next_state);
 973         trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 974                          field->prev_pid,
 975                          field->prev_prio,
 976                          S,
 977                          field->next_cpu,
 978                          field->next_pid,
 979                          field->next_prio,
 980                          T);
 981
 982         return trace_handle_return(&iter->seq);
 983 }
 984
 985 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
 986                                        struct trace_event *event)
 987 {
 988         return trace_ctxwake_raw(iter, 0);
 989 }
 990
 991 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
 992                                         struct trace_event *event)
 993 {
 994         return trace_ctxwake_raw(iter, '+');
 995 }
 996
 997
 998 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 999 {
1000         struct ctx_switch_entry *field;
1001         struct trace_seq *s = &iter->seq;
1002         int T;
1003
1004         trace_assign_type(field, iter->ent);
1005
1006         if (!S)
1007                 S = task_index_to_char(field->prev_state);
1008         T = task_index_to_char(field->next_state);
1009
1010         SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1011         SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1012         SEQ_PUT_HEX_FIELD(s, S);
1013         SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1014         SEQ_PUT_HEX_FIELD(s, field->next_pid);
1015         SEQ_PUT_HEX_FIELD(s, field->next_prio);
1016         SEQ_PUT_HEX_FIELD(s, T);
1017
1018         return trace_handle_return(s);
1019 }
1020
1021 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1022                                        struct trace_event *event)
1023 {
1024         return trace_ctxwake_hex(iter, 0);
1025 }
1026
1027 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1028                                         struct trace_event *event)
1029 {
1030         return trace_ctxwake_hex(iter, '+');
1031 }
1032
1033 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1034                                            int flags, struct trace_event *event)
1035 {
1036         struct ctx_switch_entry *field;
1037         struct trace_seq *s = &iter->seq;
1038
1039         trace_assign_type(field, iter->ent);
1040
1041         SEQ_PUT_FIELD(s, field->prev_pid);
1042         SEQ_PUT_FIELD(s, field->prev_prio);
1043         SEQ_PUT_FIELD(s, field->prev_state);
1044         SEQ_PUT_FIELD(s, field->next_cpu);
1045         SEQ_PUT_FIELD(s, field->next_pid);
1046         SEQ_PUT_FIELD(s, field->next_prio);
1047         SEQ_PUT_FIELD(s, field->next_state);
1048
1049         return trace_handle_return(s);
1050 }
1051
1052 static struct trace_event_functions trace_ctx_funcs = {
1053         .trace          = trace_ctx_print,
1054         .raw            = trace_ctx_raw,
1055         .hex            = trace_ctx_hex,
1056         .binary         = trace_ctxwake_bin,
1057 };
1058
1059 static struct trace_event trace_ctx_event = {
1060         .type           = TRACE_CTX,
1061         .funcs          = &trace_ctx_funcs,
1062 };
1063
1064 static struct trace_event_functions trace_wake_funcs = {
1065         .trace          = trace_wake_print,
1066         .raw            = trace_wake_raw,
1067         .hex            = trace_wake_hex,
1068         .binary         = trace_ctxwake_bin,
1069 };
1070
1071 static struct trace_event trace_wake_event = {
1072         .type           = TRACE_WAKE,
1073         .funcs          = &trace_wake_funcs,
1074 };
1075
1076 /* TRACE_STACK */
1077
1078 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1079                                            int flags, struct trace_event *event)
1080 {
1081         struct stack_entry *field;
1082         struct trace_seq *s = &iter->seq;
1083         unsigned long *p;
1084         unsigned long *end;
1085
1086         trace_assign_type(field, iter->ent);
1087         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1088
1089         trace_seq_puts(s, "<stack trace>\n");
1090
1091         for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1092
1093                 if (trace_seq_has_overflowed(s))
1094                         break;
1095
1096                 trace_seq_puts(s, " => ");
1097                 seq_print_ip_sym(s, *p, flags);
1098                 trace_seq_putc(s, '\n');
1099         }
1100
1101         return trace_handle_return(s);
1102 }
1103
1104 static struct trace_event_functions trace_stack_funcs = {
1105         .trace          = trace_stack_print,
1106 };
1107
1108 static struct trace_event trace_stack_event = {
1109         .type           = TRACE_STACK,
1110         .funcs          = &trace_stack_funcs,
1111 };
1112
1113 /* TRACE_USER_STACK */
1114 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1115                                                 int flags, struct trace_event *event)
1116 {
1117         struct trace_array *tr = iter->tr;
1118         struct userstack_entry *field;
1119         struct trace_seq *s = &iter->seq;
1120         struct mm_struct *mm = NULL;
1121         unsigned int i;
1122
1123         trace_assign_type(field, iter->ent);
1124
1125         trace_seq_puts(s, "<user stack trace>\n");
1126
1127         if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1128                 struct task_struct *task;
1129                 /*
1130                  * we do the lookup on the thread group leader,
1131                  * since individual threads might have already quit!
1132                  */
1133                 rcu_read_lock();
1134                 task = find_task_by_vpid(field->tgid);
1135                 if (task)
1136                         mm = get_task_mm(task);
1137                 rcu_read_unlock();
1138         }
1139
1140         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1141                 unsigned long ip = field->caller[i];
1142
1143                 if (!ip || trace_seq_has_overflowed(s))
1144                         break;
1145
1146                 trace_seq_puts(s, " => ");
1147                 seq_print_user_ip(s, mm, ip, flags);
1148                 trace_seq_putc(s, '\n');
1149         }
1150
1151         if (mm)
1152                 mmput(mm);
1153
1154         return trace_handle_return(s);
1155 }
1156
1157 static struct trace_event_functions trace_user_stack_funcs = {
1158         .trace          = trace_user_stack_print,
1159 };
1160
1161 static struct trace_event trace_user_stack_event = {
1162         .type           = TRACE_USER_STACK,
1163         .funcs          = &trace_user_stack_funcs,
1164 };
1165
1166 /* TRACE_HWLAT */
1167 static enum print_line_t
1168 trace_hwlat_print(struct trace_iterator *iter, int flags,
1169                   struct trace_event *event)
1170 {
1171         struct trace_entry *entry = iter->ent;
1172         struct trace_seq *s = &iter->seq;
1173         struct hwlat_entry *field;
1174
1175         trace_assign_type(field, entry);
1176
1177         trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1178                          field->seqnum,
1179                          field->duration,
1180                          field->outer_duration,
1181                          (long long)field->timestamp.tv_sec,
1182                          field->timestamp.tv_nsec, field->count);
1183
1184         if (field->nmi_count) {
1185                 /*
1186                  * The generic sched_clock() is not NMI safe, thus
1187                  * we only record the count and not the time.
1188                  */
1189                 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1190                         trace_seq_printf(s, " nmi-total:%llu",
1191                                          field->nmi_total_ts);
1192                 trace_seq_printf(s, " nmi-count:%u",
1193                                  field->nmi_count);
1194         }
1195
1196         trace_seq_putc(s, '\n');
1197
1198         return trace_handle_return(s);
1199 }
1200
1201 static enum print_line_t
1202 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1203                 struct trace_event *event)
1204 {
1205         struct hwlat_entry *field;
1206         struct trace_seq *s = &iter->seq;
1207
1208         trace_assign_type(field, iter->ent);
1209
1210         trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1211                          field->duration,
1212                          field->outer_duration,
1213                          (long long)field->timestamp.tv_sec,
1214                          field->timestamp.tv_nsec,
1215                          field->seqnum);
1216
1217         return trace_handle_return(s);
1218 }
1219
1220 static struct trace_event_functions trace_hwlat_funcs = {
1221         .trace          = trace_hwlat_print,
1222         .raw            = trace_hwlat_raw,
1223 };
1224
1225 static struct trace_event trace_hwlat_event = {
1226         .type           = TRACE_HWLAT,
1227         .funcs          = &trace_hwlat_funcs,
1228 };
1229
1230 /* TRACE_OSNOISE */
1231 static enum print_line_t
1232 trace_osnoise_print(struct trace_iterator *iter, int flags,
1233                     struct trace_event *event)
1234 {
1235         struct trace_entry *entry = iter->ent;
1236         struct trace_seq *s = &iter->seq;
1237         struct osnoise_entry *field;
1238         u64 ratio, ratio_dec;
1239         u64 net_runtime;
1240
1241         trace_assign_type(field, entry);
1242
1243         /*
1244          * compute the available % of cpu time.
1245          */
1246         net_runtime = field->runtime - field->noise;
1247         ratio = net_runtime * 10000000;
1248         do_div(ratio, field->runtime);
1249         ratio_dec = do_div(ratio, 100000);
1250
1251         trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1252                          field->runtime,
1253                          field->noise,
1254                          ratio, ratio_dec,
1255                          field->max_sample);
1256
1257         trace_seq_printf(s, " %6u", field->hw_count);
1258         trace_seq_printf(s, " %6u", field->nmi_count);
1259         trace_seq_printf(s, " %6u", field->irq_count);
1260         trace_seq_printf(s, " %6u", field->softirq_count);
1261         trace_seq_printf(s, " %6u", field->thread_count);
1262
1263         trace_seq_putc(s, '\n');
1264
1265         return trace_handle_return(s);
1266 }
1267
1268 static enum print_line_t
1269 trace_osnoise_raw(struct trace_iterator *iter, int flags,
1270                   struct trace_event *event)
1271 {
1272         struct osnoise_entry *field;
1273         struct trace_seq *s = &iter->seq;
1274
1275         trace_assign_type(field, iter->ent);
1276
1277         trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1278                          field->runtime,
1279                          field->noise,
1280                          field->max_sample,
1281                          field->hw_count,
1282                          field->nmi_count,
1283                          field->irq_count,
1284                          field->softirq_count,
1285                          field->thread_count);
1286
1287         return trace_handle_return(s);
1288 }
1289
1290 static struct trace_event_functions trace_osnoise_funcs = {
1291         .trace          = trace_osnoise_print,
1292         .raw            = trace_osnoise_raw,
1293 };
1294
1295 static struct trace_event trace_osnoise_event = {
1296         .type           = TRACE_OSNOISE,
1297         .funcs          = &trace_osnoise_funcs,
1298 };
1299
1300 /* TRACE_TIMERLAT */
1301 static enum print_line_t
1302 trace_timerlat_print(struct trace_iterator *iter, int flags,
1303                      struct trace_event *event)
1304 {
1305         struct trace_entry *entry = iter->ent;
1306         struct trace_seq *s = &iter->seq;
1307         struct timerlat_entry *field;
1308
1309         trace_assign_type(field, entry);
1310
1311         trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1312                          field->seqnum,
1313                          field->context ? "thread" : "irq",
1314                          field->timer_latency);
1315
1316         return trace_handle_return(s);
1317 }
1318
1319 static enum print_line_t
1320 trace_timerlat_raw(struct trace_iterator *iter, int flags,
1321                    struct trace_event *event)
1322 {
1323         struct timerlat_entry *field;
1324         struct trace_seq *s = &iter->seq;
1325
1326         trace_assign_type(field, iter->ent);
1327
1328         trace_seq_printf(s, "%u %d %llu\n",
1329                          field->seqnum,
1330                          field->context,
1331                          field->timer_latency);
1332
1333         return trace_handle_return(s);
1334 }
1335
1336 static struct trace_event_functions trace_timerlat_funcs = {
1337         .trace          = trace_timerlat_print,
1338         .raw            = trace_timerlat_raw,
1339 };
1340
1341 static struct trace_event trace_timerlat_event = {
1342         .type           = TRACE_TIMERLAT,
1343         .funcs          = &trace_timerlat_funcs,
1344 };
1345
1346 /* TRACE_BPUTS */
1347 static enum print_line_t
1348 trace_bputs_print(struct trace_iterator *iter, int flags,
1349                    struct trace_event *event)
1350 {
1351         struct trace_entry *entry = iter->ent;
1352         struct trace_seq *s = &iter->seq;
1353         struct bputs_entry *field;
1354
1355         trace_assign_type(field, entry);
1356
1357         seq_print_ip_sym(s, field->ip, flags);
1358         trace_seq_puts(s, ": ");
1359         trace_seq_puts(s, field->str);
1360
1361         return trace_handle_return(s);
1362 }
1363
1364
1365 static enum print_line_t
1366 trace_bputs_raw(struct trace_iterator *iter, int flags,
1367                 struct trace_event *event)
1368 {
1369         struct bputs_entry *field;
1370         struct trace_seq *s = &iter->seq;
1371
1372         trace_assign_type(field, iter->ent);
1373
1374         trace_seq_printf(s, ": %lx : ", field->ip);
1375         trace_seq_puts(s, field->str);
1376
1377         return trace_handle_return(s);
1378 }
1379
1380 static struct trace_event_functions trace_bputs_funcs = {
1381         .trace          = trace_bputs_print,
1382         .raw            = trace_bputs_raw,
1383 };
1384
1385 static struct trace_event trace_bputs_event = {
1386         .type           = TRACE_BPUTS,
1387         .funcs          = &trace_bputs_funcs,
1388 };
1389
1390 /* TRACE_BPRINT */
1391 static enum print_line_t
1392 trace_bprint_print(struct trace_iterator *iter, int flags,
1393                    struct trace_event *event)
1394 {
1395         struct trace_entry *entry = iter->ent;
1396         struct trace_seq *s = &iter->seq;
1397         struct bprint_entry *field;
1398
1399         trace_assign_type(field, entry);
1400
1401         seq_print_ip_sym(s, field->ip, flags);
1402         trace_seq_puts(s, ": ");
1403         trace_seq_bprintf(s, field->fmt, field->buf);
1404
1405         return trace_handle_return(s);
1406 }
1407
1408
1409 static enum print_line_t
1410 trace_bprint_raw(struct trace_iterator *iter, int flags,
1411                  struct trace_event *event)
1412 {
1413         struct bprint_entry *field;
1414         struct trace_seq *s = &iter->seq;
1415
1416         trace_assign_type(field, iter->ent);
1417
1418         trace_seq_printf(s, ": %lx : ", field->ip);
1419         trace_seq_bprintf(s, field->fmt, field->buf);
1420
1421         return trace_handle_return(s);
1422 }
1423
1424 static struct trace_event_functions trace_bprint_funcs = {
1425         .trace          = trace_bprint_print,
1426         .raw            = trace_bprint_raw,
1427 };
1428
1429 static struct trace_event trace_bprint_event = {
1430         .type           = TRACE_BPRINT,
1431         .funcs          = &trace_bprint_funcs,
1432 };
1433
1434 /* TRACE_PRINT */
1435 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1436                                            int flags, struct trace_event *event)
1437 {
1438         struct print_entry *field;
1439         struct trace_seq *s = &iter->seq;
1440
1441         trace_assign_type(field, iter->ent);
1442
1443         seq_print_ip_sym(s, field->ip, flags);
1444         trace_seq_printf(s, ": %s", field->buf);
1445
1446         return trace_handle_return(s);
1447 }
1448
1449 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1450                                          struct trace_event *event)
1451 {
1452         struct print_entry *field;
1453
1454         trace_assign_type(field, iter->ent);
1455
1456         trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1457
1458         return trace_handle_return(&iter->seq);
1459 }
1460
1461 static struct trace_event_functions trace_print_funcs = {
1462         .trace          = trace_print_print,
1463         .raw            = trace_print_raw,
1464 };
1465
1466 static struct trace_event trace_print_event = {
1467         .type           = TRACE_PRINT,
1468         .funcs          = &trace_print_funcs,
1469 };
1470
1471 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1472                                          struct trace_event *event)
1473 {
1474         struct raw_data_entry *field;
1475         int i;
1476
1477         trace_assign_type(field, iter->ent);
1478
1479         trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1480
1481         for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1482                 trace_seq_printf(&iter->seq, " %02x",
1483                                  (unsigned char)field->buf[i]);
1484
1485         trace_seq_putc(&iter->seq, '\n');
1486
1487         return trace_handle_return(&iter->seq);
1488 }
1489
1490 static struct trace_event_functions trace_raw_data_funcs = {
1491         .trace          = trace_raw_data,
1492         .raw            = trace_raw_data,
1493 };
1494
1495 static struct trace_event trace_raw_data_event = {
1496         .type           = TRACE_RAW_DATA,
1497         .funcs          = &trace_raw_data_funcs,
1498 };
1499
1500 static enum print_line_t
1501 trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1502                          struct trace_event *event)
1503 {
1504         struct func_repeats_entry *field;
1505         struct trace_seq *s = &iter->seq;
1506
1507         trace_assign_type(field, iter->ent);
1508
1509         trace_seq_printf(s, "%lu %lu %u %llu\n",
1510                          field->ip,
1511                          field->parent_ip,
1512                          field->count,
1513                          FUNC_REPEATS_GET_DELTA_TS(field));
1514
1515         return trace_handle_return(s);
1516 }
1517
1518 static enum print_line_t
1519 trace_func_repeats_print(struct trace_iterator *iter, int flags,
1520                          struct trace_event *event)
1521 {
1522         struct func_repeats_entry *field;
1523         struct trace_seq *s = &iter->seq;
1524
1525         trace_assign_type(field, iter->ent);
1526
1527         print_fn_trace(s, field->ip, field->parent_ip, flags);
1528         trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1529         trace_print_time(s, iter,
1530                          iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1531         trace_seq_puts(s, ")\n");
1532
1533         return trace_handle_return(s);
1534 }
1535
1536 static struct trace_event_functions trace_func_repeats_funcs = {
1537         .trace          = trace_func_repeats_print,
1538         .raw            = trace_func_repeats_raw,
1539 };
1540
1541 static struct trace_event trace_func_repeats_event = {
1542         .type           = TRACE_FUNC_REPEATS,
1543         .funcs          = &trace_func_repeats_funcs,
1544 };
1545
1546 static struct trace_event *events[] __initdata = {
1547         &trace_fn_event,
1548         &trace_ctx_event,
1549         &trace_wake_event,
1550         &trace_stack_event,
1551         &trace_user_stack_event,
1552         &trace_bputs_event,
1553         &trace_bprint_event,
1554         &trace_print_event,
1555         &trace_hwlat_event,
1556         &trace_osnoise_event,
1557         &trace_timerlat_event,
1558         &trace_raw_data_event,
1559         &trace_func_repeats_event,
1560         NULL
1561 };
1562
1563 __init static int init_events(void)
1564 {
1565         struct trace_event *event;
1566         int i, ret;
1567
1568         for (i = 0; events[i]; i++) {
1569                 event = events[i];
1570
1571                 ret = register_trace_event(event);
1572                 if (!ret) {
1573                         printk(KERN_WARNING "event %d failed to register\n",
1574                                event->type);
1575                         WARN_ON_ONCE(1);
1576                 }
1577         }
1578
1579         return 0;
1580 }
1581 early_initcall(init_events);