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 <[email protected]>
   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 bh_off;
 449         int nmi;
 450
 451         nmi = entry->flags & TRACE_FLAG_NMI;
 452         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 453         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 454         bh_off = entry->flags & TRACE_FLAG_BH_OFF;
 455
 456         irqs_off =
 457                 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
 458                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 459                 bh_off ? 'b' :
 460                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 461                 '.';
 462
 463         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 464                                 TRACE_FLAG_PREEMPT_RESCHED)) {
 465         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 466                 need_resched = 'N';
 467                 break;
 468         case TRACE_FLAG_NEED_RESCHED:
 469                 need_resched = 'n';
 470                 break;
 471         case TRACE_FLAG_PREEMPT_RESCHED:
 472                 need_resched = 'p';
 473                 break;
 474         default:
 475                 need_resched = '.';
 476                 break;
 477         }
 478
 479         hardsoft_irq =
 480                 (nmi && hardirq)     ? 'Z' :
 481                 nmi                  ? 'z' :
 482                 (hardirq && softirq) ? 'H' :
 483                 hardirq              ? 'h' :
 484                 softirq              ? 's' :
 485                                        '.' ;
 486
 487         trace_seq_printf(s, "%c%c%c",
 488                          irqs_off, need_resched, hardsoft_irq);
 489
 490         if (entry->preempt_count & 0xf)
 491                 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
 492         else
 493                 trace_seq_putc(s, '.');
 494
 495         if (entry->preempt_count & 0xf0)
 496                 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
 497         else
 498                 trace_seq_putc(s, '.');
 499
 500         return !trace_seq_has_overflowed(s);
 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         trace_seq_printf(s, "%8.8s-%-7d %3d",
 511                          comm, entry->pid, cpu);
 512
 513         return trace_print_lat_fmt(s, entry);
 514 }
 515
 516 #undef MARK
 517 #define MARK(v, s) {.val = v, .sym = s}
 518 /* trace overhead mark */
 519 static const struct trace_mark {
 520         unsigned long long      val; /* unit: nsec */
 521         char                    sym;
 522 } mark[] = {
 523         MARK(1000000000ULL      , '$'), /* 1 sec */
 524         MARK(100000000ULL       , '@'), /* 100 msec */
 525         MARK(10000000ULL        , '*'), /* 10 msec */
 526         MARK(1000000ULL         , '#'), /* 1000 usecs */
 527         MARK(100000ULL          , '!'), /* 100 usecs */
 528         MARK(10000ULL           , '+'), /* 10 usecs */
 529 };
 530 #undef MARK
 531
 532 char trace_find_mark(unsigned long long d)
 533 {
 534         int i;
 535         int size = ARRAY_SIZE(mark);
 536
 537         for (i = 0; i < size; i++) {
 538                 if (d > mark[i].val)
 539                         break;
 540         }
 541
 542         return (i == size) ? ' ' : mark[i].sym;
 543 }
 544
 545 static int
 546 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 547 {
 548         struct trace_array *tr = iter->tr;
 549         unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 550         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 551         unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
 552         unsigned long long rel_ts = next_ts - iter->ts;
 553         struct trace_seq *s = &iter->seq;
 554
 555         if (in_ns) {
 556                 abs_ts = ns2usecs(abs_ts);
 557                 rel_ts = ns2usecs(rel_ts);
 558         }
 559
 560         if (verbose && in_ns) {
 561                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 562                 unsigned long abs_msec = (unsigned long)abs_ts;
 563                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 564                 unsigned long rel_msec = (unsigned long)rel_ts;
 565
 566                 trace_seq_printf(
 567                         s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 568                         ns2usecs(iter->ts),
 569                         abs_msec, abs_usec,
 570                         rel_msec, rel_usec);
 571
 572         } else if (verbose && !in_ns) {
 573                 trace_seq_printf(
 574                         s, "[%016llx] %lld (+%lld): ",
 575                         iter->ts, abs_ts, rel_ts);
 576
 577         } else if (!verbose && in_ns) {
 578                 trace_seq_printf(
 579                         s, " %4lldus%c: ",
 580                         abs_ts,
 581                         trace_find_mark(rel_ts * NSEC_PER_USEC));
 582
 583         } else { /* !verbose && !in_ns */
 584                 trace_seq_printf(s, " %4lld: ", abs_ts);
 585         }
 586
 587         return !trace_seq_has_overflowed(s);
 588 }
 589
 590 static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
 591                              unsigned long long ts)
 592 {
 593         unsigned long secs, usec_rem;
 594         unsigned long long t;
 595
 596         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 597                 t = ns2usecs(ts);
 598                 usec_rem = do_div(t, USEC_PER_SEC);
 599                 secs = (unsigned long)t;
 600                 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
 601         } else
 602                 trace_seq_printf(s, " %12llu", ts);
 603 }
 604
 605 int trace_print_context(struct trace_iterator *iter)
 606 {
 607         struct trace_array *tr = iter->tr;
 608         struct trace_seq *s = &iter->seq;
 609         struct trace_entry *entry = iter->ent;
 610         char comm[TASK_COMM_LEN];
 611
 612         trace_find_cmdline(entry->pid, comm);
 613
 614         trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
 615
 616         if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
 617                 unsigned int tgid = trace_find_tgid(entry->pid);
 618
 619                 if (!tgid)
 620                         trace_seq_printf(s, "(-------) ");
 621                 else
 622                         trace_seq_printf(s, "(%7d) ", tgid);
 623         }
 624
 625         trace_seq_printf(s, "[%03d] ", iter->cpu);
 626
 627         if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 628                 trace_print_lat_fmt(s, entry);
 629
 630         trace_print_time(s, iter, iter->ts);
 631         trace_seq_puts(s, ": ");
 632
 633         return !trace_seq_has_overflowed(s);
 634 }
 635
 636 int trace_print_lat_context(struct trace_iterator *iter)
 637 {
 638         struct trace_entry *entry, *next_entry;
 639         struct trace_array *tr = iter->tr;
 640         struct trace_seq *s = &iter->seq;
 641         unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 642         u64 next_ts;
 643
 644         next_entry = trace_find_next_entry(iter, NULL, &next_ts);
 645         if (!next_entry)
 646                 next_ts = iter->ts;
 647
 648         /* trace_find_next_entry() may change iter->ent */
 649         entry = iter->ent;
 650
 651         if (verbose) {
 652                 char comm[TASK_COMM_LEN];
 653
 654                 trace_find_cmdline(entry->pid, comm);
 655
 656                 trace_seq_printf(
 657                         s, "%16s %7d %3d %d %08x %08lx ",
 658                         comm, entry->pid, iter->cpu, entry->flags,
 659                         entry->preempt_count & 0xf, iter->idx);
 660         } else {
 661                 lat_print_generic(s, entry, iter->cpu);
 662         }
 663
 664         lat_print_timestamp(iter, next_ts);
 665
 666         return !trace_seq_has_overflowed(s);
 667 }
 668
 669 /**
 670  * ftrace_find_event - find a registered event
 671  * @type: the type of event to look for
 672  *
 673  * Returns an event of type @type otherwise NULL
 674  * Called with trace_event_read_lock() held.
 675  */
 676 struct trace_event *ftrace_find_event(int type)
 677 {
 678         struct trace_event *event;
 679         unsigned key;
 680
 681         key = type & (EVENT_HASHSIZE - 1);
 682
 683         hlist_for_each_entry(event, &event_hash[key], node) {
 684                 if (event->type == type)
 685                         return event;
 686         }
 687
 688         return NULL;
 689 }
 690
 691 static LIST_HEAD(ftrace_event_list);
 692
 693 static int trace_search_list(struct list_head **list)
 694 {
 695         struct trace_event *e;
 696         int next = __TRACE_LAST_TYPE;
 697
 698         if (list_empty(&ftrace_event_list)) {
 699                 *list = &ftrace_event_list;
 700                 return next;
 701         }
 702
 703         /*
 704          * We used up all possible max events,
 705          * lets see if somebody freed one.
 706          */
 707         list_for_each_entry(e, &ftrace_event_list, list) {
 708                 if (e->type != next)
 709                         break;
 710                 next++;
 711         }
 712
 713         /* Did we used up all 65 thousand events??? */
 714         if (next > TRACE_EVENT_TYPE_MAX)
 715                 return 0;
 716
 717         *list = &e->list;
 718         return next;
 719 }
 720
 721 void trace_event_read_lock(void)
 722 {
 723         down_read(&trace_event_sem);
 724 }
 725
 726 void trace_event_read_unlock(void)
 727 {
 728         up_read(&trace_event_sem);
 729 }
 730
 731 /**
 732  * register_trace_event - register output for an event type
 733  * @event: the event type to register
 734  *
 735  * Event types are stored in a hash and this hash is used to
 736  * find a way to print an event. If the @event->type is set
 737  * then it will use that type, otherwise it will assign a
 738  * type to use.
 739  *
 740  * If you assign your own type, please make sure it is added
 741  * to the trace_type enum in trace.h, to avoid collisions
 742  * with the dynamic types.
 743  *
 744  * Returns the event type number or zero on error.
 745  */
 746 int register_trace_event(struct trace_event *event)
 747 {
 748         unsigned key;
 749         int ret = 0;
 750
 751         down_write(&trace_event_sem);
 752
 753         if (WARN_ON(!event))
 754                 goto out;
 755
 756         if (WARN_ON(!event->funcs))
 757                 goto out;
 758
 759         INIT_LIST_HEAD(&event->list);
 760
 761         if (!event->type) {
 762                 struct list_head *list = NULL;
 763
 764                 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
 765
 766                         event->type = trace_search_list(&list);
 767                         if (!event->type)
 768                                 goto out;
 769
 770                 } else {
 771
 772                         event->type = next_event_type++;
 773                         list = &ftrace_event_list;
 774                 }
 775
 776                 if (WARN_ON(ftrace_find_event(event->type)))
 777                         goto out;
 778
 779                 list_add_tail(&event->list, list);
 780
 781         } else if (event->type > __TRACE_LAST_TYPE) {
 782                 printk(KERN_WARNING "Need to add type to trace.h\n");
 783                 WARN_ON(1);
 784                 goto out;
 785         } else {
 786                 /* Is this event already used */
 787                 if (ftrace_find_event(event->type))
 788                         goto out;
 789         }
 790
 791         if (event->funcs->trace == NULL)
 792                 event->funcs->trace = trace_nop_print;
 793         if (event->funcs->raw == NULL)
 794                 event->funcs->raw = trace_nop_print;
 795         if (event->funcs->hex == NULL)
 796                 event->funcs->hex = trace_nop_print;
 797         if (event->funcs->binary == NULL)
 798                 event->funcs->binary = trace_nop_print;
 799
 800         key = event->type & (EVENT_HASHSIZE - 1);
 801
 802         hlist_add_head(&event->node, &event_hash[key]);
 803
 804         ret = event->type;
 805  out:
 806         up_write(&trace_event_sem);
 807
 808         return ret;
 809 }
 810 EXPORT_SYMBOL_GPL(register_trace_event);
 811
 812 /*
 813  * Used by module code with the trace_event_sem held for write.
 814  */
 815 int __unregister_trace_event(struct trace_event *event)
 816 {
 817         hlist_del(&event->node);
 818         list_del(&event->list);
 819         return 0;
 820 }
 821
 822 /**
 823  * unregister_trace_event - remove a no longer used event
 824  * @event: the event to remove
 825  */
 826 int unregister_trace_event(struct trace_event *event)
 827 {
 828         down_write(&trace_event_sem);
 829         __unregister_trace_event(event);
 830         up_write(&trace_event_sem);
 831
 832         return 0;
 833 }
 834 EXPORT_SYMBOL_GPL(unregister_trace_event);
 835
 836 /*
 837  * Standard events
 838  */
 839
 840 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 841                                   struct trace_event *event)
 842 {
 843         trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
 844
 845         return trace_handle_return(&iter->seq);
 846 }
 847
 848 static void print_fn_trace(struct trace_seq *s, unsigned long ip,
 849                            unsigned long parent_ip, int flags)
 850 {
 851         seq_print_ip_sym(s, ip, flags);
 852
 853         if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
 854                 trace_seq_puts(s, " <-");
 855                 seq_print_ip_sym(s, parent_ip, flags);
 856         }
 857 }
 858
 859 /* TRACE_FN */
 860 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 861                                         struct trace_event *event)
 862 {
 863         struct ftrace_entry *field;
 864         struct trace_seq *s = &iter->seq;
 865
 866         trace_assign_type(field, iter->ent);
 867
 868         print_fn_trace(s, field->ip, field->parent_ip, flags);
 869         trace_seq_putc(s, '\n');
 870
 871         return trace_handle_return(s);
 872 }
 873
 874 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 875                                       struct trace_event *event)
 876 {
 877         struct ftrace_entry *field;
 878
 879         trace_assign_type(field, iter->ent);
 880
 881         trace_seq_printf(&iter->seq, "%lx %lx\n",
 882                          field->ip,
 883                          field->parent_ip);
 884
 885         return trace_handle_return(&iter->seq);
 886 }
 887
 888 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
 889                                       struct trace_event *event)
 890 {
 891         struct ftrace_entry *field;
 892         struct trace_seq *s = &iter->seq;
 893
 894         trace_assign_type(field, iter->ent);
 895
 896         SEQ_PUT_HEX_FIELD(s, field->ip);
 897         SEQ_PUT_HEX_FIELD(s, field->parent_ip);
 898
 899         return trace_handle_return(s);
 900 }
 901
 902 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
 903                                       struct trace_event *event)
 904 {
 905         struct ftrace_entry *field;
 906         struct trace_seq *s = &iter->seq;
 907
 908         trace_assign_type(field, iter->ent);
 909
 910         SEQ_PUT_FIELD(s, field->ip);
 911         SEQ_PUT_FIELD(s, field->parent_ip);
 912
 913         return trace_handle_return(s);
 914 }
 915
 916 static struct trace_event_functions trace_fn_funcs = {
 917         .trace          = trace_fn_trace,
 918         .raw            = trace_fn_raw,
 919         .hex            = trace_fn_hex,
 920         .binary         = trace_fn_bin,
 921 };
 922
 923 static struct trace_event trace_fn_event = {
 924         .type           = TRACE_FN,
 925         .funcs          = &trace_fn_funcs,
 926 };
 927
 928 /* TRACE_CTX an TRACE_WAKE */
 929 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 930                                              char *delim)
 931 {
 932         struct ctx_switch_entry *field;
 933         char comm[TASK_COMM_LEN];
 934         int S, T;
 935
 936
 937         trace_assign_type(field, iter->ent);
 938
 939         T = task_index_to_char(field->next_state);
 940         S = task_index_to_char(field->prev_state);
 941         trace_find_cmdline(field->next_pid, comm);
 942         trace_seq_printf(&iter->seq,
 943                          " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
 944                          field->prev_pid,
 945                          field->prev_prio,
 946                          S, delim,
 947                          field->next_cpu,
 948                          field->next_pid,
 949                          field->next_prio,
 950                          T, comm);
 951
 952         return trace_handle_return(&iter->seq);
 953 }
 954
 955 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
 956                                          struct trace_event *event)
 957 {
 958         return trace_ctxwake_print(iter, "==>");
 959 }
 960
 961 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 962                                           int flags, struct trace_event *event)
 963 {
 964         return trace_ctxwake_print(iter, "  +");
 965 }
 966
 967 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 968 {
 969         struct ctx_switch_entry *field;
 970         int T;
 971
 972         trace_assign_type(field, iter->ent);
 973
 974         if (!S)
 975                 S = task_index_to_char(field->prev_state);
 976         T = task_index_to_char(field->next_state);
 977         trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 978                          field->prev_pid,
 979                          field->prev_prio,
 980                          S,
 981                          field->next_cpu,
 982                          field->next_pid,
 983                          field->next_prio,
 984                          T);
 985
 986         return trace_handle_return(&iter->seq);
 987 }
 988
 989 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
 990                                        struct trace_event *event)
 991 {
 992         return trace_ctxwake_raw(iter, 0);
 993 }
 994
 995 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
 996                                         struct trace_event *event)
 997 {
 998         return trace_ctxwake_raw(iter, '+');
 999 }
1000
1001
1002 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1003 {
1004         struct ctx_switch_entry *field;
1005         struct trace_seq *s = &iter->seq;
1006         int T;
1007
1008         trace_assign_type(field, iter->ent);
1009
1010         if (!S)
1011                 S = task_index_to_char(field->prev_state);
1012         T = task_index_to_char(field->next_state);
1013
1014         SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1015         SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1016         SEQ_PUT_HEX_FIELD(s, S);
1017         SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1018         SEQ_PUT_HEX_FIELD(s, field->next_pid);
1019         SEQ_PUT_HEX_FIELD(s, field->next_prio);
1020         SEQ_PUT_HEX_FIELD(s, T);
1021
1022         return trace_handle_return(s);
1023 }
1024
1025 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1026                                        struct trace_event *event)
1027 {
1028         return trace_ctxwake_hex(iter, 0);
1029 }
1030
1031 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1032                                         struct trace_event *event)
1033 {
1034         return trace_ctxwake_hex(iter, '+');
1035 }
1036
1037 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1038                                            int flags, struct trace_event *event)
1039 {
1040         struct ctx_switch_entry *field;
1041         struct trace_seq *s = &iter->seq;
1042
1043         trace_assign_type(field, iter->ent);
1044
1045         SEQ_PUT_FIELD(s, field->prev_pid);
1046         SEQ_PUT_FIELD(s, field->prev_prio);
1047         SEQ_PUT_FIELD(s, field->prev_state);
1048         SEQ_PUT_FIELD(s, field->next_cpu);
1049         SEQ_PUT_FIELD(s, field->next_pid);
1050         SEQ_PUT_FIELD(s, field->next_prio);
1051         SEQ_PUT_FIELD(s, field->next_state);
1052
1053         return trace_handle_return(s);
1054 }
1055
1056 static struct trace_event_functions trace_ctx_funcs = {
1057         .trace          = trace_ctx_print,
1058         .raw            = trace_ctx_raw,
1059         .hex            = trace_ctx_hex,
1060         .binary         = trace_ctxwake_bin,
1061 };
1062
1063 static struct trace_event trace_ctx_event = {
1064         .type           = TRACE_CTX,
1065         .funcs          = &trace_ctx_funcs,
1066 };
1067
1068 static struct trace_event_functions trace_wake_funcs = {
1069         .trace          = trace_wake_print,
1070         .raw            = trace_wake_raw,
1071         .hex            = trace_wake_hex,
1072         .binary         = trace_ctxwake_bin,
1073 };
1074
1075 static struct trace_event trace_wake_event = {
1076         .type           = TRACE_WAKE,
1077         .funcs          = &trace_wake_funcs,
1078 };
1079
1080 /* TRACE_STACK */
1081
1082 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1083                                            int flags, struct trace_event *event)
1084 {
1085         struct stack_entry *field;
1086         struct trace_seq *s = &iter->seq;
1087         unsigned long *p;
1088         unsigned long *end;
1089
1090         trace_assign_type(field, iter->ent);
1091         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1092
1093         trace_seq_puts(s, "<stack trace>\n");
1094
1095         for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1096
1097                 if (trace_seq_has_overflowed(s))
1098                         break;
1099
1100                 trace_seq_puts(s, " => ");
1101                 seq_print_ip_sym(s, *p, flags);
1102                 trace_seq_putc(s, '\n');
1103         }
1104
1105         return trace_handle_return(s);
1106 }
1107
1108 static struct trace_event_functions trace_stack_funcs = {
1109         .trace          = trace_stack_print,
1110 };
1111
1112 static struct trace_event trace_stack_event = {
1113         .type           = TRACE_STACK,
1114         .funcs          = &trace_stack_funcs,
1115 };
1116
1117 /* TRACE_USER_STACK */
1118 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1119                                                 int flags, struct trace_event *event)
1120 {
1121         struct trace_array *tr = iter->tr;
1122         struct userstack_entry *field;
1123         struct trace_seq *s = &iter->seq;
1124         struct mm_struct *mm = NULL;
1125         unsigned int i;
1126
1127         trace_assign_type(field, iter->ent);
1128
1129         trace_seq_puts(s, "<user stack trace>\n");
1130
1131         if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1132                 struct task_struct *task;
1133                 /*
1134                  * we do the lookup on the thread group leader,
1135                  * since individual threads might have already quit!
1136                  */
1137                 rcu_read_lock();
1138                 task = find_task_by_vpid(field->tgid);
1139                 if (task)
1140                         mm = get_task_mm(task);
1141                 rcu_read_unlock();
1142         }
1143
1144         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1145                 unsigned long ip = field->caller[i];
1146
1147                 if (!ip || trace_seq_has_overflowed(s))
1148                         break;
1149
1150                 trace_seq_puts(s, " => ");
1151                 seq_print_user_ip(s, mm, ip, flags);
1152                 trace_seq_putc(s, '\n');
1153         }
1154
1155         if (mm)
1156                 mmput(mm);
1157
1158         return trace_handle_return(s);
1159 }
1160
1161 static struct trace_event_functions trace_user_stack_funcs = {
1162         .trace          = trace_user_stack_print,
1163 };
1164
1165 static struct trace_event trace_user_stack_event = {
1166         .type           = TRACE_USER_STACK,
1167         .funcs          = &trace_user_stack_funcs,
1168 };
1169
1170 /* TRACE_HWLAT */
1171 static enum print_line_t
1172 trace_hwlat_print(struct trace_iterator *iter, int flags,
1173                   struct trace_event *event)
1174 {
1175         struct trace_entry *entry = iter->ent;
1176         struct trace_seq *s = &iter->seq;
1177         struct hwlat_entry *field;
1178
1179         trace_assign_type(field, entry);
1180
1181         trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1182                          field->seqnum,
1183                          field->duration,
1184                          field->outer_duration,
1185                          (long long)field->timestamp.tv_sec,
1186                          field->timestamp.tv_nsec, field->count);
1187
1188         if (field->nmi_count) {
1189                 /*
1190                  * The generic sched_clock() is not NMI safe, thus
1191                  * we only record the count and not the time.
1192                  */
1193                 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1194                         trace_seq_printf(s, " nmi-total:%llu",
1195                                          field->nmi_total_ts);
1196                 trace_seq_printf(s, " nmi-count:%u",
1197                                  field->nmi_count);
1198         }
1199
1200         trace_seq_putc(s, '\n');
1201
1202         return trace_handle_return(s);
1203 }
1204
1205 static enum print_line_t
1206 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1207                 struct trace_event *event)
1208 {
1209         struct hwlat_entry *field;
1210         struct trace_seq *s = &iter->seq;
1211
1212         trace_assign_type(field, iter->ent);
1213
1214         trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1215                          field->duration,
1216                          field->outer_duration,
1217                          (long long)field->timestamp.tv_sec,
1218                          field->timestamp.tv_nsec,
1219                          field->seqnum);
1220
1221         return trace_handle_return(s);
1222 }
1223
1224 static struct trace_event_functions trace_hwlat_funcs = {
1225         .trace          = trace_hwlat_print,
1226         .raw            = trace_hwlat_raw,
1227 };
1228
1229 static struct trace_event trace_hwlat_event = {
1230         .type           = TRACE_HWLAT,
1231         .funcs          = &trace_hwlat_funcs,
1232 };
1233
1234 /* TRACE_OSNOISE */
1235 static enum print_line_t
1236 trace_osnoise_print(struct trace_iterator *iter, int flags,
1237                     struct trace_event *event)
1238 {
1239         struct trace_entry *entry = iter->ent;
1240         struct trace_seq *s = &iter->seq;
1241         struct osnoise_entry *field;
1242         u64 ratio, ratio_dec;
1243         u64 net_runtime;
1244
1245         trace_assign_type(field, entry);
1246
1247         /*
1248          * compute the available % of cpu time.
1249          */
1250         net_runtime = field->runtime - field->noise;
1251         ratio = net_runtime * 10000000;
1252         do_div(ratio, field->runtime);
1253         ratio_dec = do_div(ratio, 100000);
1254
1255         trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1256                          field->runtime,
1257                          field->noise,
1258                          ratio, ratio_dec,
1259                          field->max_sample);
1260
1261         trace_seq_printf(s, " %6u", field->hw_count);
1262         trace_seq_printf(s, " %6u", field->nmi_count);
1263         trace_seq_printf(s, " %6u", field->irq_count);
1264         trace_seq_printf(s, " %6u", field->softirq_count);
1265         trace_seq_printf(s, " %6u", field->thread_count);
1266
1267         trace_seq_putc(s, '\n');
1268
1269         return trace_handle_return(s);
1270 }
1271
1272 static enum print_line_t
1273 trace_osnoise_raw(struct trace_iterator *iter, int flags,
1274                   struct trace_event *event)
1275 {
1276         struct osnoise_entry *field;
1277         struct trace_seq *s = &iter->seq;
1278
1279         trace_assign_type(field, iter->ent);
1280
1281         trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1282                          field->runtime,
1283                          field->noise,
1284                          field->max_sample,
1285                          field->hw_count,
1286                          field->nmi_count,
1287                          field->irq_count,
1288                          field->softirq_count,
1289                          field->thread_count);
1290
1291         return trace_handle_return(s);
1292 }
1293
1294 static struct trace_event_functions trace_osnoise_funcs = {
1295         .trace          = trace_osnoise_print,
1296         .raw            = trace_osnoise_raw,
1297 };
1298
1299 static struct trace_event trace_osnoise_event = {
1300         .type           = TRACE_OSNOISE,
1301         .funcs          = &trace_osnoise_funcs,
1302 };
1303
1304 /* TRACE_TIMERLAT */
1305 static enum print_line_t
1306 trace_timerlat_print(struct trace_iterator *iter, int flags,
1307                      struct trace_event *event)
1308 {
1309         struct trace_entry *entry = iter->ent;
1310         struct trace_seq *s = &iter->seq;
1311         struct timerlat_entry *field;
1312
1313         trace_assign_type(field, entry);
1314
1315         trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1316                          field->seqnum,
1317                          field->context ? "thread" : "irq",
1318                          field->timer_latency);
1319
1320         return trace_handle_return(s);
1321 }
1322
1323 static enum print_line_t
1324 trace_timerlat_raw(struct trace_iterator *iter, int flags,
1325                    struct trace_event *event)
1326 {
1327         struct timerlat_entry *field;
1328         struct trace_seq *s = &iter->seq;
1329
1330         trace_assign_type(field, iter->ent);
1331
1332         trace_seq_printf(s, "%u %d %llu\n",
1333                          field->seqnum,
1334                          field->context,
1335                          field->timer_latency);
1336
1337         return trace_handle_return(s);
1338 }
1339
1340 static struct trace_event_functions trace_timerlat_funcs = {
1341         .trace          = trace_timerlat_print,
1342         .raw            = trace_timerlat_raw,
1343 };
1344
1345 static struct trace_event trace_timerlat_event = {
1346         .type           = TRACE_TIMERLAT,
1347         .funcs          = &trace_timerlat_funcs,
1348 };
1349
1350 /* TRACE_BPUTS */
1351 static enum print_line_t
1352 trace_bputs_print(struct trace_iterator *iter, int flags,
1353                    struct trace_event *event)
1354 {
1355         struct trace_entry *entry = iter->ent;
1356         struct trace_seq *s = &iter->seq;
1357         struct bputs_entry *field;
1358
1359         trace_assign_type(field, entry);
1360
1361         seq_print_ip_sym(s, field->ip, flags);
1362         trace_seq_puts(s, ": ");
1363         trace_seq_puts(s, field->str);
1364
1365         return trace_handle_return(s);
1366 }
1367
1368
1369 static enum print_line_t
1370 trace_bputs_raw(struct trace_iterator *iter, int flags,
1371                 struct trace_event *event)
1372 {
1373         struct bputs_entry *field;
1374         struct trace_seq *s = &iter->seq;
1375
1376         trace_assign_type(field, iter->ent);
1377
1378         trace_seq_printf(s, ": %lx : ", field->ip);
1379         trace_seq_puts(s, field->str);
1380
1381         return trace_handle_return(s);
1382 }
1383
1384 static struct trace_event_functions trace_bputs_funcs = {
1385         .trace          = trace_bputs_print,
1386         .raw            = trace_bputs_raw,
1387 };
1388
1389 static struct trace_event trace_bputs_event = {
1390         .type           = TRACE_BPUTS,
1391         .funcs          = &trace_bputs_funcs,
1392 };
1393
1394 /* TRACE_BPRINT */
1395 static enum print_line_t
1396 trace_bprint_print(struct trace_iterator *iter, int flags,
1397                    struct trace_event *event)
1398 {
1399         struct trace_entry *entry = iter->ent;
1400         struct trace_seq *s = &iter->seq;
1401         struct bprint_entry *field;
1402
1403         trace_assign_type(field, entry);
1404
1405         seq_print_ip_sym(s, field->ip, flags);
1406         trace_seq_puts(s, ": ");
1407         trace_seq_bprintf(s, field->fmt, field->buf);
1408
1409         return trace_handle_return(s);
1410 }
1411
1412
1413 static enum print_line_t
1414 trace_bprint_raw(struct trace_iterator *iter, int flags,
1415                  struct trace_event *event)
1416 {
1417         struct bprint_entry *field;
1418         struct trace_seq *s = &iter->seq;
1419
1420         trace_assign_type(field, iter->ent);
1421
1422         trace_seq_printf(s, ": %lx : ", field->ip);
1423         trace_seq_bprintf(s, field->fmt, field->buf);
1424
1425         return trace_handle_return(s);
1426 }
1427
1428 static struct trace_event_functions trace_bprint_funcs = {
1429         .trace          = trace_bprint_print,
1430         .raw            = trace_bprint_raw,
1431 };
1432
1433 static struct trace_event trace_bprint_event = {
1434         .type           = TRACE_BPRINT,
1435         .funcs          = &trace_bprint_funcs,
1436 };
1437
1438 /* TRACE_PRINT */
1439 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1440                                            int flags, struct trace_event *event)
1441 {
1442         struct print_entry *field;
1443         struct trace_seq *s = &iter->seq;
1444
1445         trace_assign_type(field, iter->ent);
1446
1447         seq_print_ip_sym(s, field->ip, flags);
1448         trace_seq_printf(s, ": %s", field->buf);
1449
1450         return trace_handle_return(s);
1451 }
1452
1453 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1454                                          struct trace_event *event)
1455 {
1456         struct print_entry *field;
1457
1458         trace_assign_type(field, iter->ent);
1459
1460         trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1461
1462         return trace_handle_return(&iter->seq);
1463 }
1464
1465 static struct trace_event_functions trace_print_funcs = {
1466         .trace          = trace_print_print,
1467         .raw            = trace_print_raw,
1468 };
1469
1470 static struct trace_event trace_print_event = {
1471         .type           = TRACE_PRINT,
1472         .funcs          = &trace_print_funcs,
1473 };
1474
1475 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1476                                          struct trace_event *event)
1477 {
1478         struct raw_data_entry *field;
1479         int i;
1480
1481         trace_assign_type(field, iter->ent);
1482
1483         trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1484
1485         for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1486                 trace_seq_printf(&iter->seq, " %02x",
1487                                  (unsigned char)field->buf[i]);
1488
1489         trace_seq_putc(&iter->seq, '\n');
1490
1491         return trace_handle_return(&iter->seq);
1492 }
1493
1494 static struct trace_event_functions trace_raw_data_funcs = {
1495         .trace          = trace_raw_data,
1496         .raw            = trace_raw_data,
1497 };
1498
1499 static struct trace_event trace_raw_data_event = {
1500         .type           = TRACE_RAW_DATA,
1501         .funcs          = &trace_raw_data_funcs,
1502 };
1503
1504 static enum print_line_t
1505 trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1506                          struct trace_event *event)
1507 {
1508         struct func_repeats_entry *field;
1509         struct trace_seq *s = &iter->seq;
1510
1511         trace_assign_type(field, iter->ent);
1512
1513         trace_seq_printf(s, "%lu %lu %u %llu\n",
1514                          field->ip,
1515                          field->parent_ip,
1516                          field->count,
1517                          FUNC_REPEATS_GET_DELTA_TS(field));
1518
1519         return trace_handle_return(s);
1520 }
1521
1522 static enum print_line_t
1523 trace_func_repeats_print(struct trace_iterator *iter, int flags,
1524                          struct trace_event *event)
1525 {
1526         struct func_repeats_entry *field;
1527         struct trace_seq *s = &iter->seq;
1528
1529         trace_assign_type(field, iter->ent);
1530
1531         print_fn_trace(s, field->ip, field->parent_ip, flags);
1532         trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1533         trace_print_time(s, iter,
1534                          iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1535         trace_seq_puts(s, ")\n");
1536
1537         return trace_handle_return(s);
1538 }
1539
1540 static struct trace_event_functions trace_func_repeats_funcs = {
1541         .trace          = trace_func_repeats_print,
1542         .raw            = trace_func_repeats_raw,
1543 };
1544
1545 static struct trace_event trace_func_repeats_event = {
1546         .type           = TRACE_FUNC_REPEATS,
1547         .funcs          = &trace_func_repeats_funcs,
1548 };
1549
1550 static struct trace_event *events[] __initdata = {
1551         &trace_fn_event,
1552         &trace_ctx_event,
1553         &trace_wake_event,
1554         &trace_stack_event,
1555         &trace_user_stack_event,
1556         &trace_bputs_event,
1557         &trace_bprint_event,
1558         &trace_print_event,
1559         &trace_hwlat_event,
1560         &trace_osnoise_event,
1561         &trace_timerlat_event,
1562         &trace_raw_data_event,
1563         &trace_func_repeats_event,
1564         NULL
1565 };
1566
1567 __init static int init_events(void)
1568 {
1569         struct trace_event *event;
1570         int i, ret;
1571
1572         for (i = 0; events[i]; i++) {
1573                 event = events[i];
1574
1575                 ret = register_trace_event(event);
1576                 if (!ret) {
1577                         printk(KERN_WARNING "event %d failed to register\n",
1578                                event->type);
1579                         WARN_ON_ONCE(1);
1580                 }
1581         }
1582
1583         return 0;
1584 }
1585 early_initcall(init_events);