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v6.8
   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#include <linux/idr.h>
  15
  16#include "trace_output.h"
  17
  18/* must be a power of 2 */
  19#define EVENT_HASHSIZE	128
  20
  21DECLARE_RWSEM(trace_event_sem);
  22
  23static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  24
  25enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
 
 
  26{
  27	struct trace_seq *s = &iter->seq;
  28	struct trace_entry *entry = iter->ent;
  29	struct bputs_entry *field;
  30
  31	trace_assign_type(field, entry);
  32
  33	trace_seq_puts(s, field->str);
 
 
 
 
 
  34
  35	return trace_handle_return(s);
  36}
  37
  38enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  39{
  40	struct trace_seq *s = &iter->seq;
  41	struct trace_entry *entry = iter->ent;
  42	struct bprint_entry *field;
 
  43
  44	trace_assign_type(field, entry);
  45
  46	trace_seq_bprintf(s, field->fmt, field->buf);
 
 
  47
  48	return trace_handle_return(s);
  49}
  50
  51enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  52{
  53	struct trace_seq *s = &iter->seq;
  54	struct trace_entry *entry = iter->ent;
  55	struct print_entry *field;
 
  56
  57	trace_assign_type(field, entry);
  58
  59	trace_seq_puts(s, field->buf);
 
 
  60
  61	return trace_handle_return(s);
  62}
  63
  64const char *
  65trace_print_flags_seq(struct trace_seq *p, const char *delim,
  66		      unsigned long flags,
  67		      const struct trace_print_flags *flag_array)
 
 
 
 
 
 
 
 
 
 
 
 
  68{
  69	unsigned long mask;
  70	const char *str;
  71	const char *ret = trace_seq_buffer_ptr(p);
  72	int i, first = 1;
  73
  74	for (i = 0;  flag_array[i].name && flags; i++) {
 
  75
  76		mask = flag_array[i].mask;
  77		if ((flags & mask) != mask)
  78			continue;
  79
  80		str = flag_array[i].name;
  81		flags &= ~mask;
  82		if (!first && delim)
  83			trace_seq_puts(p, delim);
  84		else
  85			first = 0;
  86		trace_seq_puts(p, str);
  87	}
  88
  89	/* check for left over flags */
  90	if (flags) {
  91		if (!first && delim)
  92			trace_seq_puts(p, delim);
  93		trace_seq_printf(p, "0x%lx", flags);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  94	}
  95
  96	trace_seq_putc(p, 0);
  97
  98	return ret;
  99}
 100EXPORT_SYMBOL(trace_print_flags_seq);
 101
 102const char *
 103trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 104			const struct trace_print_flags *symbol_array)
 105{
 106	int i;
 107	const char *ret = trace_seq_buffer_ptr(p);
 108
 109	for (i = 0;  symbol_array[i].name; i++) {
 
 110
 111		if (val != symbol_array[i].mask)
 112			continue;
 113
 114		trace_seq_puts(p, symbol_array[i].name);
 115		break;
 
 
 116	}
 117
 118	if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 119		trace_seq_printf(p, "0x%lx", val);
 120
 121	trace_seq_putc(p, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 122
 123	return ret;
 124}
 125EXPORT_SYMBOL(trace_print_symbols_seq);
 126
 127#if BITS_PER_LONG == 32
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 128const char *
 129trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
 130		      unsigned long long flags,
 131		      const struct trace_print_flags_u64 *flag_array)
 132{
 133	unsigned long long mask;
 134	const char *str;
 135	const char *ret = trace_seq_buffer_ptr(p);
 136	int i, first = 1;
 137
 138	for (i = 0;  flag_array[i].name && flags; i++) {
 139
 140		mask = flag_array[i].mask;
 141		if ((flags & mask) != mask)
 142			continue;
 143
 144		str = flag_array[i].name;
 145		flags &= ~mask;
 146		if (!first && delim)
 147			trace_seq_puts(p, delim);
 148		else
 149			first = 0;
 150		trace_seq_puts(p, str);
 151	}
 152
 153	/* check for left over flags */
 154	if (flags) {
 155		if (!first && delim)
 156			trace_seq_puts(p, delim);
 157		trace_seq_printf(p, "0x%llx", flags);
 158	}
 159
 160	trace_seq_putc(p, 0);
 161
 162	return ret;
 163}
 164EXPORT_SYMBOL(trace_print_flags_seq_u64);
 165
 166const char *
 167trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 168			 const struct trace_print_flags_u64 *symbol_array)
 169{
 170	int i;
 171	const char *ret = trace_seq_buffer_ptr(p);
 172
 173	for (i = 0;  symbol_array[i].name; i++) {
 174
 175		if (val != symbol_array[i].mask)
 176			continue;
 177
 178		trace_seq_puts(p, symbol_array[i].name);
 179		break;
 180	}
 181
 182	if (ret == (const char *)(trace_seq_buffer_ptr(p)))
 183		trace_seq_printf(p, "0x%llx", val);
 184
 185	trace_seq_putc(p, 0);
 186
 187	return ret;
 188}
 189EXPORT_SYMBOL(trace_print_symbols_seq_u64);
 190#endif
 191
 192const char *
 193trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
 194			unsigned int bitmask_size)
 195{
 196	const char *ret = trace_seq_buffer_ptr(p);
 197
 198	trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
 199	trace_seq_putc(p, 0);
 200
 201	return ret;
 202}
 203EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
 204
 205/**
 206 * trace_print_hex_seq - print buffer as hex sequence
 207 * @p: trace seq struct to write to
 208 * @buf: The buffer to print
 209 * @buf_len: Length of @buf in bytes
 210 * @concatenate: Print @buf as single hex string or with spacing
 211 *
 212 * Prints the passed buffer as a hex sequence either as a whole,
 213 * single hex string if @concatenate is true or with spacing after
 214 * each byte in case @concatenate is false.
 215 */
 216const char *
 217trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
 218		    bool concatenate)
 219{
 220	int i;
 221	const char *ret = trace_seq_buffer_ptr(p);
 222	const char *fmt = concatenate ? "%*phN" : "%*ph";
 223
 224	for (i = 0; i < buf_len; i += 16) {
 225		if (!concatenate && i != 0)
 226			trace_seq_putc(p, ' ');
 227		trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
 228	}
 229	trace_seq_putc(p, 0);
 230
 231	return ret;
 232}
 233EXPORT_SYMBOL(trace_print_hex_seq);
 234
 235const char *
 236trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
 237		      size_t el_size)
 238{
 239	const char *ret = trace_seq_buffer_ptr(p);
 240	const char *prefix = "";
 241	void *ptr = (void *)buf;
 242	size_t buf_len = count * el_size;
 243
 244	trace_seq_putc(p, '{');
 245
 246	while (ptr < buf + buf_len) {
 247		switch (el_size) {
 248		case 1:
 249			trace_seq_printf(p, "%s0x%x", prefix,
 250					 *(u8 *)ptr);
 251			break;
 252		case 2:
 253			trace_seq_printf(p, "%s0x%x", prefix,
 254					 *(u16 *)ptr);
 255			break;
 256		case 4:
 257			trace_seq_printf(p, "%s0x%x", prefix,
 258					 *(u32 *)ptr);
 259			break;
 260		case 8:
 261			trace_seq_printf(p, "%s0x%llx", prefix,
 262					 *(u64 *)ptr);
 263			break;
 264		default:
 265			trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
 266					 *(u8 *)ptr);
 267			el_size = 1;
 268		}
 269		prefix = ",";
 270		ptr += el_size;
 271	}
 272
 273	trace_seq_putc(p, '}');
 
 
 274	trace_seq_putc(p, 0);
 275
 276	return ret;
 277}
 278EXPORT_SYMBOL(trace_print_array_seq);
 
 279
 280const char *
 281trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
 282			 int prefix_type, int rowsize, int groupsize,
 283			 const void *buf, size_t len, bool ascii)
 284{
 285	const char *ret = trace_seq_buffer_ptr(p);
 286
 287	trace_seq_putc(p, '\n');
 288	trace_seq_hex_dump(p, prefix_str, prefix_type,
 289			   rowsize, groupsize, buf, len, ascii);
 290	trace_seq_putc(p, 0);
 291	return ret;
 292}
 293EXPORT_SYMBOL(trace_print_hex_dump_seq);
 294
 295int trace_raw_output_prep(struct trace_iterator *iter,
 296			  struct trace_event *trace_event)
 297{
 298	struct trace_event_call *event;
 299	struct trace_seq *s = &iter->seq;
 300	struct trace_seq *p = &iter->tmp_seq;
 301	struct trace_entry *entry;
 302
 303	event = container_of(trace_event, struct trace_event_call, event);
 304	entry = iter->ent;
 305
 306	if (entry->type != event->event.type) {
 307		WARN_ON_ONCE(1);
 308		return TRACE_TYPE_UNHANDLED;
 309	}
 310
 311	trace_seq_init(p);
 312	trace_seq_printf(s, "%s: ", trace_event_name(event));
 313
 314	return trace_handle_return(s);
 315}
 316EXPORT_SYMBOL(trace_raw_output_prep);
 317
 318void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
 
 319{
 320	va_list ap;
 
 321
 322	va_start(ap, fmt);
 323	trace_check_vprintf(iter, trace_event_format(iter, fmt), ap);
 324	va_end(ap);
 325}
 326EXPORT_SYMBOL(trace_event_printf);
 327
 328static __printf(3, 0)
 329int trace_output_raw(struct trace_iterator *iter, char *name,
 330		     char *fmt, va_list ap)
 331{
 332	struct trace_seq *s = &iter->seq;
 333
 334	trace_seq_printf(s, "%s: ", name);
 335	trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
 336
 337	return trace_handle_return(s);
 338}
 
 339
 340int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 
 341{
 342	va_list ap;
 343	int ret;
 
 344
 345	va_start(ap, fmt);
 346	ret = trace_output_raw(iter, name, fmt, ap);
 347	va_end(ap);
 348
 349	return ret;
 350}
 351EXPORT_SYMBOL_GPL(trace_output_call);
 352
 353static inline const char *kretprobed(const char *name, unsigned long addr)
 354{
 355	if (is_kretprobe_trampoline(addr))
 356		return "[unknown/kretprobe'd]";
 357	return name;
 358}
 359
 360void
 361trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
 
 362{
 363#ifdef CONFIG_KALLSYMS
 364	char str[KSYM_SYMBOL_LEN];
 365	const char *name;
 366
 367	if (offset)
 368		sprint_symbol(str, address);
 369	else
 370		kallsyms_lookup(address, NULL, NULL, NULL, str);
 371	name = kretprobed(str, address);
 372
 373	if (name && strlen(name)) {
 374		trace_seq_puts(s, name);
 375		return;
 376	}
 377#endif
 378	trace_seq_printf(s, "0x%08lx", address);
 379}
 380
 381#ifndef CONFIG_64BIT
 382# define IP_FMT "%08lx"
 383#else
 384# define IP_FMT "%016lx"
 385#endif
 386
 387static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 388			     unsigned long ip, unsigned long sym_flags)
 389{
 390	struct file *file = NULL;
 391	unsigned long vmstart = 0;
 392	int ret = 1;
 393
 394	if (s->full)
 395		return 0;
 396
 397	if (mm) {
 398		const struct vm_area_struct *vma;
 399
 400		mmap_read_lock(mm);
 401		vma = find_vma(mm, ip);
 402		if (vma) {
 403			file = vma->vm_file;
 404			vmstart = vma->vm_start;
 405		}
 406		if (file) {
 407			ret = trace_seq_path(s, file_user_path(file));
 408			if (ret)
 409				trace_seq_printf(s, "[+0x%lx]",
 410						 ip - vmstart);
 411		}
 412		mmap_read_unlock(mm);
 413	}
 414	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 415		trace_seq_printf(s, " <" IP_FMT ">", ip);
 416	return !trace_seq_has_overflowed(s);
 417}
 418
 419int
 420seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 
 421{
 422	if (!ip) {
 423		trace_seq_putc(s, '0');
 424		goto out;
 
 
 
 
 
 
 
 
 
 
 
 
 425	}
 426
 427	trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
 
 428
 429	if (sym_flags & TRACE_ITER_SYM_ADDR)
 430		trace_seq_printf(s, " <" IP_FMT ">", ip);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 431
 432 out:
 433	return !trace_seq_has_overflowed(s);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 434}
 435
 436/**
 437 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 438 * @s: trace seq struct to write to
 439 * @entry: The trace entry field from the ring buffer
 440 *
 441 * Prints the generic fields of irqs off, in hard or softirq, preempt
 442 * count.
 443 */
 444int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 445{
 446	char hardsoft_irq;
 447	char need_resched;
 448	char irqs_off;
 449	int hardirq;
 450	int softirq;
 451	int bh_off;
 452	int nmi;
 453
 454	nmi = entry->flags & TRACE_FLAG_NMI;
 455	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 456	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 457	bh_off = entry->flags & TRACE_FLAG_BH_OFF;
 458
 459	irqs_off =
 460		(entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
 461		(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 462		bh_off ? 'b' :
 463		(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 464		'.';
 465
 466	switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 467				TRACE_FLAG_PREEMPT_RESCHED)) {
 468	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 469		need_resched = 'N';
 470		break;
 471	case TRACE_FLAG_NEED_RESCHED:
 472		need_resched = 'n';
 473		break;
 474	case TRACE_FLAG_PREEMPT_RESCHED:
 475		need_resched = 'p';
 476		break;
 477	default:
 478		need_resched = '.';
 479		break;
 480	}
 481
 482	hardsoft_irq =
 483		(nmi && hardirq)     ? 'Z' :
 484		nmi                  ? 'z' :
 485		(hardirq && softirq) ? 'H' :
 486		hardirq              ? 'h' :
 487		softirq              ? 's' :
 488		                       '.' ;
 489
 490	trace_seq_printf(s, "%c%c%c",
 491			 irqs_off, need_resched, hardsoft_irq);
 492
 493	if (entry->preempt_count & 0xf)
 494		trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
 495	else
 496		trace_seq_putc(s, '.');
 497
 498	if (entry->preempt_count & 0xf0)
 499		trace_seq_printf(s, "%x", entry->preempt_count >> 4);
 500	else
 501		trace_seq_putc(s, '.');
 502
 503	return !trace_seq_has_overflowed(s);
 504}
 505
 506static int
 507lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 508{
 509	char comm[TASK_COMM_LEN];
 510
 511	trace_find_cmdline(entry->pid, comm);
 512
 513	trace_seq_printf(s, "%8.8s-%-7d %3d",
 514			 comm, entry->pid, cpu);
 
 515
 516	return trace_print_lat_fmt(s, entry);
 517}
 518
 519#undef MARK
 520#define MARK(v, s) {.val = v, .sym = s}
 521/* trace overhead mark */
 522static const struct trace_mark {
 523	unsigned long long	val; /* unit: nsec */
 524	char			sym;
 525} mark[] = {
 526	MARK(1000000000ULL	, '$'), /* 1 sec */
 527	MARK(100000000ULL	, '@'), /* 100 msec */
 528	MARK(10000000ULL	, '*'), /* 10 msec */
 529	MARK(1000000ULL		, '#'), /* 1000 usecs */
 530	MARK(100000ULL		, '!'), /* 100 usecs */
 531	MARK(10000ULL		, '+'), /* 10 usecs */
 532};
 533#undef MARK
 534
 535char trace_find_mark(unsigned long long d)
 536{
 537	int i;
 538	int size = ARRAY_SIZE(mark);
 539
 540	for (i = 0; i < size; i++) {
 541		if (d > mark[i].val)
 542			break;
 543	}
 544
 545	return (i == size) ? ' ' : mark[i].sym;
 546}
 547
 548static int
 549lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 
 550{
 551	struct trace_array *tr = iter->tr;
 552	unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 553	unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 554	unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
 555	unsigned long long rel_ts = next_ts - iter->ts;
 556	struct trace_seq *s = &iter->seq;
 557
 558	if (in_ns) {
 559		abs_ts = ns2usecs(abs_ts);
 560		rel_ts = ns2usecs(rel_ts);
 561	}
 562
 563	if (verbose && in_ns) {
 564		unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 565		unsigned long abs_msec = (unsigned long)abs_ts;
 566		unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 567		unsigned long rel_msec = (unsigned long)rel_ts;
 568
 569		trace_seq_printf(
 570			s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 571			ns2usecs(iter->ts),
 572			abs_msec, abs_usec,
 573			rel_msec, rel_usec);
 574
 575	} else if (verbose && !in_ns) {
 576		trace_seq_printf(
 577			s, "[%016llx] %lld (+%lld): ",
 578			iter->ts, abs_ts, rel_ts);
 579
 580	} else if (!verbose && in_ns) {
 581		trace_seq_printf(
 582			s, " %4lldus%c: ",
 583			abs_ts,
 584			trace_find_mark(rel_ts * NSEC_PER_USEC));
 585
 586	} else { /* !verbose && !in_ns */
 587		trace_seq_printf(s, " %4lld: ", abs_ts);
 588	}
 589
 590	return !trace_seq_has_overflowed(s);
 591}
 592
 593static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
 594			     unsigned long long ts)
 595{
 596	unsigned long secs, usec_rem;
 597	unsigned long long t;
 598
 599	if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 600		t = ns2usecs(ts);
 601		usec_rem = do_div(t, USEC_PER_SEC);
 602		secs = (unsigned long)t;
 603		trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
 604	} else
 605		trace_seq_printf(s, " %12llu", ts);
 606}
 607
 608int trace_print_context(struct trace_iterator *iter)
 609{
 610	struct trace_array *tr = iter->tr;
 611	struct trace_seq *s = &iter->seq;
 612	struct trace_entry *entry = iter->ent;
 
 
 
 613	char comm[TASK_COMM_LEN];
 
 614
 615	trace_find_cmdline(entry->pid, comm);
 616
 617	trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
 618
 619	if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
 620		unsigned int tgid = trace_find_tgid(entry->pid);
 621
 622		if (!tgid)
 623			trace_seq_printf(s, "(-------) ");
 624		else
 625			trace_seq_printf(s, "(%7d) ", tgid);
 626	}
 627
 628	trace_seq_printf(s, "[%03d] ", iter->cpu);
 629
 630	if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 631		trace_print_lat_fmt(s, entry);
 632
 633	trace_print_time(s, iter, iter->ts);
 634	trace_seq_puts(s, ": ");
 635
 636	return !trace_seq_has_overflowed(s);
 637}
 638
 639int trace_print_lat_context(struct trace_iterator *iter)
 640{
 641	struct trace_entry *entry, *next_entry;
 642	struct trace_array *tr = iter->tr;
 643	struct trace_seq *s = &iter->seq;
 644	unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 645	u64 next_ts;
 
 
 
 
 
 
 
 
 
 
 
 
 
 646
 647	next_entry = trace_find_next_entry(iter, NULL, &next_ts);
 648	if (!next_entry)
 649		next_ts = iter->ts;
 650
 651	/* trace_find_next_entry() may change iter->ent */
 652	entry = iter->ent;
 653
 654	if (verbose) {
 655		char comm[TASK_COMM_LEN];
 656
 657		trace_find_cmdline(entry->pid, comm);
 658
 659		trace_seq_printf(
 660			s, "%16s %7d %3d %d %08x %08lx ",
 661			comm, entry->pid, iter->cpu, entry->flags,
 662			entry->preempt_count & 0xf, iter->idx);
 
 
 
 
 
 663	} else {
 664		lat_print_generic(s, entry, iter->cpu);
 
 
 665	}
 666
 667	lat_print_timestamp(iter, next_ts);
 
 
 
 
 
 
 
 668
 669	return !trace_seq_has_overflowed(s);
 670}
 671
 672/**
 673 * ftrace_find_event - find a registered event
 674 * @type: the type of event to look for
 675 *
 676 * Returns an event of type @type otherwise NULL
 677 * Called with trace_event_read_lock() held.
 678 */
 679struct trace_event *ftrace_find_event(int type)
 680{
 681	struct trace_event *event;
 
 682	unsigned key;
 683
 684	key = type & (EVENT_HASHSIZE - 1);
 685
 686	hlist_for_each_entry(event, &event_hash[key], node) {
 687		if (event->type == type)
 688			return event;
 689	}
 690
 691	return NULL;
 692}
 693
 694static DEFINE_IDA(trace_event_ida);
 695
 696static void free_trace_event_type(int type)
 697{
 698	if (type >= __TRACE_LAST_TYPE)
 699		ida_free(&trace_event_ida, type);
 700}
 701
 702static int alloc_trace_event_type(void)
 703{
 704	int next;
 
 705
 706	/* Skip static defined type numbers */
 707	next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
 708			       TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
 709	if (next < 0)
 
 
 
 
 
 
 
 
 710		return 0;
 711	return next;
 
 
 712}
 713
 714void trace_event_read_lock(void)
 715{
 716	down_read(&trace_event_sem);
 717}
 718
 719void trace_event_read_unlock(void)
 720{
 721	up_read(&trace_event_sem);
 722}
 723
 724/**
 725 * register_trace_event - register output for an event type
 726 * @event: the event type to register
 727 *
 728 * Event types are stored in a hash and this hash is used to
 729 * find a way to print an event. If the @event->type is set
 730 * then it will use that type, otherwise it will assign a
 731 * type to use.
 732 *
 733 * If you assign your own type, please make sure it is added
 734 * to the trace_type enum in trace.h, to avoid collisions
 735 * with the dynamic types.
 736 *
 737 * Returns the event type number or zero on error.
 738 */
 739int register_trace_event(struct trace_event *event)
 740{
 741	unsigned key;
 742	int ret = 0;
 743
 744	down_write(&trace_event_sem);
 745
 746	if (WARN_ON(!event))
 747		goto out;
 748
 749	if (WARN_ON(!event->funcs))
 750		goto out;
 751
 
 
 752	if (!event->type) {
 753		event->type = alloc_trace_event_type();
 754		if (!event->type)
 
 
 
 
 
 
 
 
 
 
 
 
 
 755			goto out;
 756	} else if (WARN(event->type > __TRACE_LAST_TYPE,
 757			"Need to add type to trace.h")) {
 
 
 
 
 758		goto out;
 759	} else {
 760		/* Is this event already used */
 761		if (ftrace_find_event(event->type))
 762			goto out;
 763	}
 764
 765	if (event->funcs->trace == NULL)
 766		event->funcs->trace = trace_nop_print;
 767	if (event->funcs->raw == NULL)
 768		event->funcs->raw = trace_nop_print;
 769	if (event->funcs->hex == NULL)
 770		event->funcs->hex = trace_nop_print;
 771	if (event->funcs->binary == NULL)
 772		event->funcs->binary = trace_nop_print;
 773
 774	key = event->type & (EVENT_HASHSIZE - 1);
 775
 776	hlist_add_head(&event->node, &event_hash[key]);
 777
 778	ret = event->type;
 779 out:
 780	up_write(&trace_event_sem);
 781
 782	return ret;
 783}
 784EXPORT_SYMBOL_GPL(register_trace_event);
 785
 786/*
 787 * Used by module code with the trace_event_sem held for write.
 788 */
 789int __unregister_trace_event(struct trace_event *event)
 790{
 791	hlist_del(&event->node);
 792	free_trace_event_type(event->type);
 793	return 0;
 794}
 795
 796/**
 797 * unregister_trace_event - remove a no longer used event
 798 * @event: the event to remove
 799 */
 800int unregister_trace_event(struct trace_event *event)
 801{
 802	down_write(&trace_event_sem);
 803	__unregister_trace_event(event);
 804	up_write(&trace_event_sem);
 805
 806	return 0;
 807}
 808EXPORT_SYMBOL_GPL(unregister_trace_event);
 809
 810/*
 811 * Standard events
 812 */
 813
 814static void print_array(struct trace_iterator *iter, void *pos,
 815			struct ftrace_event_field *field)
 816{
 817	int offset;
 818	int len;
 819	int i;
 820
 821	offset = *(int *)pos & 0xffff;
 822	len = *(int *)pos >> 16;
 823
 824	if (field)
 825		offset += field->offset + sizeof(int);
 826
 827	if (offset + len > iter->ent_size) {
 828		trace_seq_puts(&iter->seq, "<OVERFLOW>");
 829		return;
 830	}
 831
 832	pos = (void *)iter->ent + offset;
 833
 834	for (i = 0; i < len; i++, pos++) {
 835		if (i)
 836			trace_seq_putc(&iter->seq, ',');
 837		trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
 838	}
 839}
 840
 841static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
 842			 struct list_head *head)
 843{
 844	struct ftrace_event_field *field;
 845	int offset;
 846	int len;
 847	int ret;
 848	void *pos;
 849
 850	list_for_each_entry_reverse(field, head, link) {
 851		trace_seq_printf(&iter->seq, " %s=", field->name);
 852		if (field->offset + field->size > iter->ent_size) {
 853			trace_seq_puts(&iter->seq, "<OVERFLOW>");
 854			continue;
 855		}
 856		pos = (void *)iter->ent + field->offset;
 857
 858		switch (field->filter_type) {
 859		case FILTER_COMM:
 860		case FILTER_STATIC_STRING:
 861			trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
 862			break;
 863		case FILTER_RDYN_STRING:
 864		case FILTER_DYN_STRING:
 865			offset = *(int *)pos & 0xffff;
 866			len = *(int *)pos >> 16;
 867
 868			if (field->filter_type == FILTER_RDYN_STRING)
 869				offset += field->offset + sizeof(int);
 870
 871			if (offset + len > iter->ent_size) {
 872				trace_seq_puts(&iter->seq, "<OVERFLOW>");
 873				break;
 874			}
 875			pos = (void *)iter->ent + offset;
 876			trace_seq_printf(&iter->seq, "%.*s", len, (char *)pos);
 877			break;
 878		case FILTER_PTR_STRING:
 879			if (!iter->fmt_size)
 880				trace_iter_expand_format(iter);
 881			pos = *(void **)pos;
 882			ret = strncpy_from_kernel_nofault(iter->fmt, pos,
 883							  iter->fmt_size);
 884			if (ret < 0)
 885				trace_seq_printf(&iter->seq, "(0x%px)", pos);
 886			else
 887				trace_seq_printf(&iter->seq, "(0x%px:%s)",
 888						 pos, iter->fmt);
 889			break;
 890		case FILTER_TRACE_FN:
 891			pos = *(void **)pos;
 892			trace_seq_printf(&iter->seq, "%pS", pos);
 893			break;
 894		case FILTER_CPU:
 895		case FILTER_OTHER:
 896			switch (field->size) {
 897			case 1:
 898				if (isprint(*(char *)pos)) {
 899					trace_seq_printf(&iter->seq, "'%c'",
 900						 *(unsigned char *)pos);
 901				}
 902				trace_seq_printf(&iter->seq, "(%d)",
 903						 *(unsigned char *)pos);
 904				break;
 905			case 2:
 906				trace_seq_printf(&iter->seq, "0x%x (%d)",
 907						 *(unsigned short *)pos,
 908						 *(unsigned short *)pos);
 909				break;
 910			case 4:
 911				/* dynamic array info is 4 bytes */
 912				if (strstr(field->type, "__data_loc")) {
 913					print_array(iter, pos, NULL);
 914					break;
 915				}
 916
 917				if (strstr(field->type, "__rel_loc")) {
 918					print_array(iter, pos, field);
 919					break;
 920				}
 921
 922				trace_seq_printf(&iter->seq, "0x%x (%d)",
 923						 *(unsigned int *)pos,
 924						 *(unsigned int *)pos);
 925				break;
 926			case 8:
 927				trace_seq_printf(&iter->seq, "0x%llx (%lld)",
 928						 *(unsigned long long *)pos,
 929						 *(unsigned long long *)pos);
 930				break;
 931			default:
 932				trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
 933				break;
 934			}
 935			break;
 936		default:
 937			trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
 938		}
 939	}
 940	trace_seq_putc(&iter->seq, '\n');
 941}
 942
 943enum print_line_t print_event_fields(struct trace_iterator *iter,
 944				     struct trace_event *event)
 945{
 946	struct trace_event_call *call;
 947	struct list_head *head;
 948
 949	/* ftrace defined events have separate call structures */
 950	if (event->type <= __TRACE_LAST_TYPE) {
 951		bool found = false;
 952
 953		down_read(&trace_event_sem);
 954		list_for_each_entry(call, &ftrace_events, list) {
 955			if (call->event.type == event->type) {
 956				found = true;
 957				break;
 958			}
 959			/* No need to search all events */
 960			if (call->event.type > __TRACE_LAST_TYPE)
 961				break;
 962		}
 963		up_read(&trace_event_sem);
 964		if (!found) {
 965			trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
 966			goto out;
 967		}
 968	} else {
 969		call = container_of(event, struct trace_event_call, event);
 970	}
 971	head = trace_get_fields(call);
 972
 973	trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
 974
 975	if (head && !list_empty(head))
 976		print_fields(iter, call, head);
 977	else
 978		trace_seq_puts(&iter->seq, "No fields found\n");
 979
 980 out:
 981	return trace_handle_return(&iter->seq);
 982}
 983
 984enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 985				  struct trace_event *event)
 986{
 987	trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
 988
 989	return trace_handle_return(&iter->seq);
 990}
 991
 992static void print_fn_trace(struct trace_seq *s, unsigned long ip,
 993			   unsigned long parent_ip, int flags)
 994{
 995	seq_print_ip_sym(s, ip, flags);
 996
 997	if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
 998		trace_seq_puts(s, " <-");
 999		seq_print_ip_sym(s, parent_ip, flags);
1000	}
1001}
1002
1003/* TRACE_FN */
1004static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1005					struct trace_event *event)
1006{
1007	struct ftrace_entry *field;
1008	struct trace_seq *s = &iter->seq;
1009
1010	trace_assign_type(field, iter->ent);
1011
1012	print_fn_trace(s, field->ip, field->parent_ip, flags);
1013	trace_seq_putc(s, '\n');
 
 
 
 
 
 
 
 
 
 
 
 
 
1014
1015	return trace_handle_return(s);
 
1016}
1017
1018static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1019				      struct trace_event *event)
1020{
1021	struct ftrace_entry *field;
1022
1023	trace_assign_type(field, iter->ent);
1024
1025	trace_seq_printf(&iter->seq, "%lx %lx\n",
1026			 field->ip,
1027			 field->parent_ip);
 
1028
1029	return trace_handle_return(&iter->seq);
1030}
1031
1032static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1033				      struct trace_event *event)
1034{
1035	struct ftrace_entry *field;
1036	struct trace_seq *s = &iter->seq;
1037
1038	trace_assign_type(field, iter->ent);
1039
1040	SEQ_PUT_HEX_FIELD(s, field->ip);
1041	SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1042
1043	return trace_handle_return(s);
1044}
1045
1046static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1047				      struct trace_event *event)
1048{
1049	struct ftrace_entry *field;
1050	struct trace_seq *s = &iter->seq;
1051
1052	trace_assign_type(field, iter->ent);
1053
1054	SEQ_PUT_FIELD(s, field->ip);
1055	SEQ_PUT_FIELD(s, field->parent_ip);
1056
1057	return trace_handle_return(s);
1058}
1059
1060static struct trace_event_functions trace_fn_funcs = {
1061	.trace		= trace_fn_trace,
1062	.raw		= trace_fn_raw,
1063	.hex		= trace_fn_hex,
1064	.binary		= trace_fn_bin,
1065};
1066
1067static struct trace_event trace_fn_event = {
1068	.type		= TRACE_FN,
1069	.funcs		= &trace_fn_funcs,
1070};
1071
1072/* TRACE_CTX an TRACE_WAKE */
1073static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1074					     char *delim)
1075{
1076	struct ctx_switch_entry *field;
1077	char comm[TASK_COMM_LEN];
1078	int S, T;
1079
1080
1081	trace_assign_type(field, iter->ent);
1082
1083	T = task_index_to_char(field->next_state);
1084	S = task_index_to_char(field->prev_state);
1085	trace_find_cmdline(field->next_pid, comm);
1086	trace_seq_printf(&iter->seq,
1087			 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1088			 field->prev_pid,
1089			 field->prev_prio,
1090			 S, delim,
1091			 field->next_cpu,
1092			 field->next_pid,
1093			 field->next_prio,
1094			 T, comm);
 
1095
1096	return trace_handle_return(&iter->seq);
1097}
1098
1099static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1100					 struct trace_event *event)
1101{
1102	return trace_ctxwake_print(iter, "==>");
1103}
1104
1105static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1106					  int flags, struct trace_event *event)
1107{
1108	return trace_ctxwake_print(iter, "  +");
1109}
1110
1111static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1112{
1113	struct ctx_switch_entry *field;
1114	int T;
1115
1116	trace_assign_type(field, iter->ent);
1117
1118	if (!S)
1119		S = task_index_to_char(field->prev_state);
1120	T = task_index_to_char(field->next_state);
1121	trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1122			 field->prev_pid,
1123			 field->prev_prio,
1124			 S,
1125			 field->next_cpu,
1126			 field->next_pid,
1127			 field->next_prio,
1128			 T);
 
1129
1130	return trace_handle_return(&iter->seq);
1131}
1132
1133static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1134				       struct trace_event *event)
1135{
1136	return trace_ctxwake_raw(iter, 0);
1137}
1138
1139static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1140					struct trace_event *event)
1141{
1142	return trace_ctxwake_raw(iter, '+');
1143}
1144
1145
1146static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1147{
1148	struct ctx_switch_entry *field;
1149	struct trace_seq *s = &iter->seq;
1150	int T;
1151
1152	trace_assign_type(field, iter->ent);
1153
1154	if (!S)
1155		S = task_index_to_char(field->prev_state);
1156	T = task_index_to_char(field->next_state);
1157
1158	SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1159	SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1160	SEQ_PUT_HEX_FIELD(s, S);
1161	SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1162	SEQ_PUT_HEX_FIELD(s, field->next_pid);
1163	SEQ_PUT_HEX_FIELD(s, field->next_prio);
1164	SEQ_PUT_HEX_FIELD(s, T);
1165
1166	return trace_handle_return(s);
1167}
1168
1169static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1170				       struct trace_event *event)
1171{
1172	return trace_ctxwake_hex(iter, 0);
1173}
1174
1175static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1176					struct trace_event *event)
1177{
1178	return trace_ctxwake_hex(iter, '+');
1179}
1180
1181static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1182					   int flags, struct trace_event *event)
1183{
1184	struct ctx_switch_entry *field;
1185	struct trace_seq *s = &iter->seq;
1186
1187	trace_assign_type(field, iter->ent);
1188
1189	SEQ_PUT_FIELD(s, field->prev_pid);
1190	SEQ_PUT_FIELD(s, field->prev_prio);
1191	SEQ_PUT_FIELD(s, field->prev_state);
1192	SEQ_PUT_FIELD(s, field->next_cpu);
1193	SEQ_PUT_FIELD(s, field->next_pid);
1194	SEQ_PUT_FIELD(s, field->next_prio);
1195	SEQ_PUT_FIELD(s, field->next_state);
1196
1197	return trace_handle_return(s);
1198}
1199
1200static struct trace_event_functions trace_ctx_funcs = {
1201	.trace		= trace_ctx_print,
1202	.raw		= trace_ctx_raw,
1203	.hex		= trace_ctx_hex,
1204	.binary		= trace_ctxwake_bin,
1205};
1206
1207static struct trace_event trace_ctx_event = {
1208	.type		= TRACE_CTX,
1209	.funcs		= &trace_ctx_funcs,
1210};
1211
1212static struct trace_event_functions trace_wake_funcs = {
1213	.trace		= trace_wake_print,
1214	.raw		= trace_wake_raw,
1215	.hex		= trace_wake_hex,
1216	.binary		= trace_ctxwake_bin,
1217};
1218
1219static struct trace_event trace_wake_event = {
1220	.type		= TRACE_WAKE,
1221	.funcs		= &trace_wake_funcs,
1222};
1223
1224/* TRACE_STACK */
1225
1226static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1227					   int flags, struct trace_event *event)
1228{
1229	struct stack_entry *field;
1230	struct trace_seq *s = &iter->seq;
1231	unsigned long *p;
1232	unsigned long *end;
1233
1234	trace_assign_type(field, iter->ent);
1235	end = (unsigned long *)((long)iter->ent + iter->ent_size);
1236
1237	trace_seq_puts(s, "<stack trace>\n");
 
1238
1239	for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1240
1241		if (trace_seq_has_overflowed(s))
1242			break;
1243
1244		trace_seq_puts(s, " => ");
1245		seq_print_ip_sym(s, *p, flags);
1246		trace_seq_putc(s, '\n');
 
1247	}
1248
1249	return trace_handle_return(s);
 
 
 
1250}
1251
1252static struct trace_event_functions trace_stack_funcs = {
1253	.trace		= trace_stack_print,
1254};
1255
1256static struct trace_event trace_stack_event = {
1257	.type		= TRACE_STACK,
1258	.funcs		= &trace_stack_funcs,
1259};
1260
1261/* TRACE_USER_STACK */
1262static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1263						int flags, struct trace_event *event)
1264{
1265	struct trace_array *tr = iter->tr;
1266	struct userstack_entry *field;
1267	struct trace_seq *s = &iter->seq;
1268	struct mm_struct *mm = NULL;
1269	unsigned int i;
1270
1271	trace_assign_type(field, iter->ent);
1272
1273	trace_seq_puts(s, "<user stack trace>\n");
 
1274
1275	if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1276		struct task_struct *task;
1277		/*
1278		 * we do the lookup on the thread group leader,
1279		 * since individual threads might have already quit!
1280		 */
1281		rcu_read_lock();
1282		task = find_task_by_vpid(field->tgid);
1283		if (task)
1284			mm = get_task_mm(task);
1285		rcu_read_unlock();
1286	}
1287
1288	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1289		unsigned long ip = field->caller[i];
1290
1291		if (!ip || trace_seq_has_overflowed(s))
1292			break;
1293
1294		trace_seq_puts(s, " => ");
1295		seq_print_user_ip(s, mm, ip, flags);
1296		trace_seq_putc(s, '\n');
1297	}
1298
1299	if (mm)
1300		mmput(mm);
1301
1302	return trace_handle_return(s);
1303}
1304
1305static struct trace_event_functions trace_user_stack_funcs = {
1306	.trace		= trace_user_stack_print,
1307};
1308
1309static struct trace_event trace_user_stack_event = {
1310	.type		= TRACE_USER_STACK,
1311	.funcs		= &trace_user_stack_funcs,
1312};
1313
1314/* TRACE_HWLAT */
1315static enum print_line_t
1316trace_hwlat_print(struct trace_iterator *iter, int flags,
1317		  struct trace_event *event)
1318{
1319	struct trace_entry *entry = iter->ent;
1320	struct trace_seq *s = &iter->seq;
1321	struct hwlat_entry *field;
1322
1323	trace_assign_type(field, entry);
1324
1325	trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1326			 field->seqnum,
1327			 field->duration,
1328			 field->outer_duration,
1329			 (long long)field->timestamp.tv_sec,
1330			 field->timestamp.tv_nsec, field->count);
1331
1332	if (field->nmi_count) {
1333		/*
1334		 * The generic sched_clock() is not NMI safe, thus
1335		 * we only record the count and not the time.
1336		 */
1337		if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1338			trace_seq_printf(s, " nmi-total:%llu",
1339					 field->nmi_total_ts);
1340		trace_seq_printf(s, " nmi-count:%u",
1341				 field->nmi_count);
1342	}
1343
1344	trace_seq_putc(s, '\n');
1345
1346	return trace_handle_return(s);
1347}
1348
1349static enum print_line_t
1350trace_hwlat_raw(struct trace_iterator *iter, int flags,
1351		struct trace_event *event)
1352{
1353	struct hwlat_entry *field;
1354	struct trace_seq *s = &iter->seq;
1355
1356	trace_assign_type(field, iter->ent);
1357
1358	trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1359			 field->duration,
1360			 field->outer_duration,
1361			 (long long)field->timestamp.tv_sec,
1362			 field->timestamp.tv_nsec,
1363			 field->seqnum);
1364
1365	return trace_handle_return(s);
1366}
1367
1368static struct trace_event_functions trace_hwlat_funcs = {
1369	.trace		= trace_hwlat_print,
1370	.raw		= trace_hwlat_raw,
1371};
1372
1373static struct trace_event trace_hwlat_event = {
1374	.type		= TRACE_HWLAT,
1375	.funcs		= &trace_hwlat_funcs,
1376};
1377
1378/* TRACE_OSNOISE */
1379static enum print_line_t
1380trace_osnoise_print(struct trace_iterator *iter, int flags,
1381		    struct trace_event *event)
1382{
1383	struct trace_entry *entry = iter->ent;
1384	struct trace_seq *s = &iter->seq;
1385	struct osnoise_entry *field;
1386	u64 ratio, ratio_dec;
1387	u64 net_runtime;
1388
1389	trace_assign_type(field, entry);
1390
1391	/*
1392	 * compute the available % of cpu time.
1393	 */
1394	net_runtime = field->runtime - field->noise;
1395	ratio = net_runtime * 10000000;
1396	do_div(ratio, field->runtime);
1397	ratio_dec = do_div(ratio, 100000);
1398
1399	trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1400			 field->runtime,
1401			 field->noise,
1402			 ratio, ratio_dec,
1403			 field->max_sample);
1404
1405	trace_seq_printf(s, " %6u", field->hw_count);
1406	trace_seq_printf(s, " %6u", field->nmi_count);
1407	trace_seq_printf(s, " %6u", field->irq_count);
1408	trace_seq_printf(s, " %6u", field->softirq_count);
1409	trace_seq_printf(s, " %6u", field->thread_count);
1410
1411	trace_seq_putc(s, '\n');
1412
1413	return trace_handle_return(s);
1414}
1415
1416static enum print_line_t
1417trace_osnoise_raw(struct trace_iterator *iter, int flags,
1418		  struct trace_event *event)
1419{
1420	struct osnoise_entry *field;
1421	struct trace_seq *s = &iter->seq;
1422
1423	trace_assign_type(field, iter->ent);
1424
1425	trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1426			 field->runtime,
1427			 field->noise,
1428			 field->max_sample,
1429			 field->hw_count,
1430			 field->nmi_count,
1431			 field->irq_count,
1432			 field->softirq_count,
1433			 field->thread_count);
1434
1435	return trace_handle_return(s);
1436}
1437
1438static struct trace_event_functions trace_osnoise_funcs = {
1439	.trace		= trace_osnoise_print,
1440	.raw		= trace_osnoise_raw,
1441};
1442
1443static struct trace_event trace_osnoise_event = {
1444	.type		= TRACE_OSNOISE,
1445	.funcs		= &trace_osnoise_funcs,
1446};
1447
1448/* TRACE_TIMERLAT */
1449
1450static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1451static enum print_line_t
1452trace_timerlat_print(struct trace_iterator *iter, int flags,
1453		     struct trace_event *event)
1454{
1455	struct trace_entry *entry = iter->ent;
1456	struct trace_seq *s = &iter->seq;
1457	struct timerlat_entry *field;
1458
1459	trace_assign_type(field, entry);
1460
1461	trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1462			 field->seqnum,
1463			 timerlat_lat_context[field->context],
1464			 field->timer_latency);
1465
1466	return trace_handle_return(s);
1467}
1468
1469static enum print_line_t
1470trace_timerlat_raw(struct trace_iterator *iter, int flags,
1471		   struct trace_event *event)
1472{
1473	struct timerlat_entry *field;
1474	struct trace_seq *s = &iter->seq;
1475
1476	trace_assign_type(field, iter->ent);
1477
1478	trace_seq_printf(s, "%u %d %llu\n",
1479			 field->seqnum,
1480			 field->context,
1481			 field->timer_latency);
1482
1483	return trace_handle_return(s);
1484}
1485
1486static struct trace_event_functions trace_timerlat_funcs = {
1487	.trace		= trace_timerlat_print,
1488	.raw		= trace_timerlat_raw,
1489};
1490
1491static struct trace_event trace_timerlat_event = {
1492	.type		= TRACE_TIMERLAT,
1493	.funcs		= &trace_timerlat_funcs,
1494};
1495
1496/* TRACE_BPUTS */
1497static enum print_line_t
1498trace_bputs_print(struct trace_iterator *iter, int flags,
1499		   struct trace_event *event)
1500{
1501	struct trace_entry *entry = iter->ent;
1502	struct trace_seq *s = &iter->seq;
1503	struct bputs_entry *field;
1504
1505	trace_assign_type(field, entry);
1506
1507	seq_print_ip_sym(s, field->ip, flags);
1508	trace_seq_puts(s, ": ");
1509	trace_seq_puts(s, field->str);
1510
1511	return trace_handle_return(s);
1512}
1513
1514
1515static enum print_line_t
1516trace_bputs_raw(struct trace_iterator *iter, int flags,
1517		struct trace_event *event)
1518{
1519	struct bputs_entry *field;
1520	struct trace_seq *s = &iter->seq;
1521
1522	trace_assign_type(field, iter->ent);
1523
1524	trace_seq_printf(s, ": %lx : ", field->ip);
1525	trace_seq_puts(s, field->str);
1526
1527	return trace_handle_return(s);
1528}
1529
1530static struct trace_event_functions trace_bputs_funcs = {
1531	.trace		= trace_bputs_print,
1532	.raw		= trace_bputs_raw,
1533};
1534
1535static struct trace_event trace_bputs_event = {
1536	.type		= TRACE_BPUTS,
1537	.funcs		= &trace_bputs_funcs,
1538};
1539
1540/* TRACE_BPRINT */
1541static enum print_line_t
1542trace_bprint_print(struct trace_iterator *iter, int flags,
1543		   struct trace_event *event)
1544{
1545	struct trace_entry *entry = iter->ent;
1546	struct trace_seq *s = &iter->seq;
1547	struct bprint_entry *field;
1548
1549	trace_assign_type(field, entry);
1550
1551	seq_print_ip_sym(s, field->ip, flags);
1552	trace_seq_puts(s, ": ");
1553	trace_seq_bprintf(s, field->fmt, field->buf);
1554
1555	return trace_handle_return(s);
 
 
 
 
 
 
 
 
 
1556}
1557
1558
1559static enum print_line_t
1560trace_bprint_raw(struct trace_iterator *iter, int flags,
1561		 struct trace_event *event)
1562{
1563	struct bprint_entry *field;
1564	struct trace_seq *s = &iter->seq;
1565
1566	trace_assign_type(field, iter->ent);
1567
1568	trace_seq_printf(s, ": %lx : ", field->ip);
1569	trace_seq_bprintf(s, field->fmt, field->buf);
 
 
 
1570
1571	return trace_handle_return(s);
 
 
 
1572}
1573
1574static struct trace_event_functions trace_bprint_funcs = {
1575	.trace		= trace_bprint_print,
1576	.raw		= trace_bprint_raw,
1577};
1578
1579static struct trace_event trace_bprint_event = {
1580	.type		= TRACE_BPRINT,
1581	.funcs		= &trace_bprint_funcs,
1582};
1583
1584/* TRACE_PRINT */
1585static enum print_line_t trace_print_print(struct trace_iterator *iter,
1586					   int flags, struct trace_event *event)
1587{
1588	struct print_entry *field;
1589	struct trace_seq *s = &iter->seq;
1590
1591	trace_assign_type(field, iter->ent);
1592
1593	seq_print_ip_sym(s, field->ip, flags);
1594	trace_seq_printf(s, ": %s", field->buf);
 
 
 
1595
1596	return trace_handle_return(s);
 
 
 
1597}
1598
1599static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1600					 struct trace_event *event)
1601{
1602	struct print_entry *field;
1603
1604	trace_assign_type(field, iter->ent);
1605
1606	trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
 
 
 
1607
1608	return trace_handle_return(&iter->seq);
 
1609}
1610
1611static struct trace_event_functions trace_print_funcs = {
1612	.trace		= trace_print_print,
1613	.raw		= trace_print_raw,
1614};
1615
1616static struct trace_event trace_print_event = {
1617	.type	 	= TRACE_PRINT,
1618	.funcs		= &trace_print_funcs,
1619};
1620
1621static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1622					 struct trace_event *event)
1623{
1624	struct raw_data_entry *field;
1625	int i;
1626
1627	trace_assign_type(field, iter->ent);
1628
1629	trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1630
1631	for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1632		trace_seq_printf(&iter->seq, " %02x",
1633				 (unsigned char)field->buf[i]);
1634
1635	trace_seq_putc(&iter->seq, '\n');
1636
1637	return trace_handle_return(&iter->seq);
1638}
1639
1640static struct trace_event_functions trace_raw_data_funcs = {
1641	.trace		= trace_raw_data,
1642	.raw		= trace_raw_data,
1643};
1644
1645static struct trace_event trace_raw_data_event = {
1646	.type	 	= TRACE_RAW_DATA,
1647	.funcs		= &trace_raw_data_funcs,
1648};
1649
1650static enum print_line_t
1651trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1652			 struct trace_event *event)
1653{
1654	struct func_repeats_entry *field;
1655	struct trace_seq *s = &iter->seq;
1656
1657	trace_assign_type(field, iter->ent);
1658
1659	trace_seq_printf(s, "%lu %lu %u %llu\n",
1660			 field->ip,
1661			 field->parent_ip,
1662			 field->count,
1663			 FUNC_REPEATS_GET_DELTA_TS(field));
1664
1665	return trace_handle_return(s);
1666}
1667
1668static enum print_line_t
1669trace_func_repeats_print(struct trace_iterator *iter, int flags,
1670			 struct trace_event *event)
1671{
1672	struct func_repeats_entry *field;
1673	struct trace_seq *s = &iter->seq;
1674
1675	trace_assign_type(field, iter->ent);
1676
1677	print_fn_trace(s, field->ip, field->parent_ip, flags);
1678	trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1679	trace_print_time(s, iter,
1680			 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1681	trace_seq_puts(s, ")\n");
1682
1683	return trace_handle_return(s);
1684}
1685
1686static struct trace_event_functions trace_func_repeats_funcs = {
1687	.trace		= trace_func_repeats_print,
1688	.raw		= trace_func_repeats_raw,
1689};
1690
1691static struct trace_event trace_func_repeats_event = {
1692	.type	 	= TRACE_FUNC_REPEATS,
1693	.funcs		= &trace_func_repeats_funcs,
1694};
1695
1696static struct trace_event *events[] __initdata = {
1697	&trace_fn_event,
1698	&trace_ctx_event,
1699	&trace_wake_event,
1700	&trace_stack_event,
1701	&trace_user_stack_event,
1702	&trace_bputs_event,
1703	&trace_bprint_event,
1704	&trace_print_event,
1705	&trace_hwlat_event,
1706	&trace_osnoise_event,
1707	&trace_timerlat_event,
1708	&trace_raw_data_event,
1709	&trace_func_repeats_event,
1710	NULL
1711};
1712
1713__init int init_events(void)
1714{
1715	struct trace_event *event;
1716	int i, ret;
1717
1718	for (i = 0; events[i]; i++) {
1719		event = events[i];
1720		ret = register_trace_event(event);
1721		WARN_ONCE(!ret, "event %d failed to register", event->type);
 
 
 
 
 
1722	}
1723
1724	return 0;
1725}
v3.5.6
 
   1/*
   2 * trace_output.c
   3 *
   4 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
   5 *
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/mutex.h>
  10#include <linux/ftrace.h>
 
 
 
 
  11
  12#include "trace_output.h"
  13
  14/* must be a power of 2 */
  15#define EVENT_HASHSIZE	128
  16
  17DECLARE_RWSEM(trace_event_mutex);
  18
  19static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  20
  21static int next_event_type = __TRACE_LAST_TYPE + 1;
  22
  23int trace_print_seq(struct seq_file *m, struct trace_seq *s)
  24{
  25	int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len;
  26	int ret;
 
  27
  28	ret = seq_write(m, s->buffer, len);
  29
  30	/*
  31	 * Only reset this buffer if we successfully wrote to the
  32	 * seq_file buffer.
  33	 */
  34	if (!ret)
  35		trace_seq_init(s);
  36
  37	return ret;
  38}
  39
  40enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
  41{
  42	struct trace_seq *s = &iter->seq;
  43	struct trace_entry *entry = iter->ent;
  44	struct bprint_entry *field;
  45	int ret;
  46
  47	trace_assign_type(field, entry);
  48
  49	ret = trace_seq_bprintf(s, field->fmt, field->buf);
  50	if (!ret)
  51		return TRACE_TYPE_PARTIAL_LINE;
  52
  53	return TRACE_TYPE_HANDLED;
  54}
  55
  56enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  57{
  58	struct trace_seq *s = &iter->seq;
  59	struct trace_entry *entry = iter->ent;
  60	struct print_entry *field;
  61	int ret;
  62
  63	trace_assign_type(field, entry);
  64
  65	ret = trace_seq_printf(s, "%s", field->buf);
  66	if (!ret)
  67		return TRACE_TYPE_PARTIAL_LINE;
  68
  69	return TRACE_TYPE_HANDLED;
  70}
  71
  72/**
  73 * trace_seq_printf - sequence printing of trace information
  74 * @s: trace sequence descriptor
  75 * @fmt: printf format string
  76 *
  77 * It returns 0 if the trace oversizes the buffer's free
  78 * space, 1 otherwise.
  79 *
  80 * The tracer may use either sequence operations or its own
  81 * copy to user routines. To simplify formating of a trace
  82 * trace_seq_printf is used to store strings into a special
  83 * buffer (@s). Then the output may be either used by
  84 * the sequencer or pulled into another buffer.
  85 */
  86int
  87trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
  88{
  89	int len = (PAGE_SIZE - 1) - s->len;
  90	va_list ap;
  91	int ret;
 
  92
  93	if (s->full || !len)
  94		return 0;
  95
  96	va_start(ap, fmt);
  97	ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
  98	va_end(ap);
  99
 100	/* If we can't write it all, don't bother writing anything */
 101	if (ret >= len) {
 102		s->full = 1;
 103		return 0;
 
 
 
 104	}
 105
 106	s->len += ret;
 107
 108	return 1;
 109}
 110EXPORT_SYMBOL_GPL(trace_seq_printf);
 111
 112/**
 113 * trace_seq_vprintf - sequence printing of trace information
 114 * @s: trace sequence descriptor
 115 * @fmt: printf format string
 116 *
 117 * The tracer may use either sequence operations or its own
 118 * copy to user routines. To simplify formating of a trace
 119 * trace_seq_printf is used to store strings into a special
 120 * buffer (@s). Then the output may be either used by
 121 * the sequencer or pulled into another buffer.
 122 */
 123int
 124trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
 125{
 126	int len = (PAGE_SIZE - 1) - s->len;
 127	int ret;
 128
 129	if (s->full || !len)
 130		return 0;
 131
 132	ret = vsnprintf(s->buffer + s->len, len, fmt, args);
 133
 134	/* If we can't write it all, don't bother writing anything */
 135	if (ret >= len) {
 136		s->full = 1;
 137		return 0;
 138	}
 139
 140	s->len += ret;
 141
 142	return len;
 143}
 144EXPORT_SYMBOL_GPL(trace_seq_vprintf);
 145
 146int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
 
 
 147{
 148	int len = (PAGE_SIZE - 1) - s->len;
 149	int ret;
 150
 151	if (s->full || !len)
 152		return 0;
 153
 154	ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
 
 155
 156	/* If we can't write it all, don't bother writing anything */
 157	if (ret >= len) {
 158		s->full = 1;
 159		return 0;
 160	}
 161
 162	s->len += ret;
 
 163
 164	return len;
 165}
 166
 167/**
 168 * trace_seq_puts - trace sequence printing of simple string
 169 * @s: trace sequence descriptor
 170 * @str: simple string to record
 171 *
 172 * The tracer may use either the sequence operations or its own
 173 * copy to user routines. This function records a simple string
 174 * into a special buffer (@s) for later retrieval by a sequencer
 175 * or other mechanism.
 176 */
 177int trace_seq_puts(struct trace_seq *s, const char *str)
 178{
 179	int len = strlen(str);
 180
 181	if (s->full)
 182		return 0;
 183
 184	if (len > ((PAGE_SIZE - 1) - s->len)) {
 185		s->full = 1;
 186		return 0;
 187	}
 188
 189	memcpy(s->buffer + s->len, str, len);
 190	s->len += len;
 191
 192	return len;
 193}
 194
 195int trace_seq_putc(struct trace_seq *s, unsigned char c)
 196{
 197	if (s->full)
 198		return 0;
 199
 200	if (s->len >= (PAGE_SIZE - 1)) {
 201		s->full = 1;
 202		return 0;
 203	}
 204
 205	s->buffer[s->len++] = c;
 206
 207	return 1;
 208}
 209EXPORT_SYMBOL(trace_seq_putc);
 210
 211int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
 212{
 213	if (s->full)
 214		return 0;
 215
 216	if (len > ((PAGE_SIZE - 1) - s->len)) {
 217		s->full = 1;
 218		return 0;
 219	}
 220
 221	memcpy(s->buffer + s->len, mem, len);
 222	s->len += len;
 223
 224	return len;
 225}
 226
 227int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
 228{
 229	unsigned char hex[HEX_CHARS];
 230	const unsigned char *data = mem;
 231	int i, j;
 232
 233	if (s->full)
 234		return 0;
 235
 236#ifdef __BIG_ENDIAN
 237	for (i = 0, j = 0; i < len; i++) {
 238#else
 239	for (i = len-1, j = 0; i >= 0; i--) {
 240#endif
 241		hex[j++] = hex_asc_hi(data[i]);
 242		hex[j++] = hex_asc_lo(data[i]);
 243	}
 244	hex[j++] = ' ';
 245
 246	return trace_seq_putmem(s, hex, j);
 247}
 248
 249void *trace_seq_reserve(struct trace_seq *s, size_t len)
 250{
 251	void *ret;
 252
 253	if (s->full)
 254		return NULL;
 255
 256	if (len > ((PAGE_SIZE - 1) - s->len)) {
 257		s->full = 1;
 258		return NULL;
 259	}
 260
 261	ret = s->buffer + s->len;
 262	s->len += len;
 263
 264	return ret;
 265}
 
 266
 267int trace_seq_path(struct trace_seq *s, const struct path *path)
 268{
 269	unsigned char *p;
 270
 271	if (s->full)
 272		return 0;
 273
 274	if (s->len >= (PAGE_SIZE - 1)) {
 275		s->full = 1;
 276		return 0;
 277	}
 278
 279	p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
 280	if (!IS_ERR(p)) {
 281		p = mangle_path(s->buffer + s->len, p, "\n");
 282		if (p) {
 283			s->len = p - s->buffer;
 284			return 1;
 285		}
 286	} else {
 287		s->buffer[s->len++] = '?';
 288		return 1;
 289	}
 290
 291	s->full = 1;
 292	return 0;
 293}
 294
 295const char *
 296ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
 297		       unsigned long flags,
 298		       const struct trace_print_flags *flag_array)
 299{
 300	unsigned long mask;
 301	const char *str;
 302	const char *ret = p->buffer + p->len;
 303	int i, first = 1;
 304
 305	for (i = 0;  flag_array[i].name && flags; i++) {
 306
 307		mask = flag_array[i].mask;
 308		if ((flags & mask) != mask)
 309			continue;
 310
 311		str = flag_array[i].name;
 312		flags &= ~mask;
 313		if (!first && delim)
 314			trace_seq_puts(p, delim);
 315		else
 316			first = 0;
 317		trace_seq_puts(p, str);
 318	}
 319
 320	/* check for left over flags */
 321	if (flags) {
 322		if (!first && delim)
 323			trace_seq_puts(p, delim);
 324		trace_seq_printf(p, "0x%lx", flags);
 325	}
 326
 327	trace_seq_putc(p, 0);
 328
 329	return ret;
 330}
 331EXPORT_SYMBOL(ftrace_print_flags_seq);
 332
 333const char *
 334ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
 335			 const struct trace_print_flags *symbol_array)
 336{
 337	int i;
 338	const char *ret = p->buffer + p->len;
 339
 340	for (i = 0;  symbol_array[i].name; i++) {
 341
 342		if (val != symbol_array[i].mask)
 343			continue;
 344
 345		trace_seq_puts(p, symbol_array[i].name);
 346		break;
 347	}
 348
 349	if (ret == (const char *)(p->buffer + p->len))
 350		trace_seq_printf(p, "0x%lx", val);
 351		
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 352	trace_seq_putc(p, 0);
 353
 354	return ret;
 355}
 356EXPORT_SYMBOL(ftrace_print_symbols_seq);
 357
 358#if BITS_PER_LONG == 32
 
 
 
 
 
 
 
 
 
 
 359const char *
 360ftrace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
 361			 const struct trace_print_flags_u64 *symbol_array)
 362{
 363	int i;
 364	const char *ret = p->buffer + p->len;
 
 365
 366	for (i = 0;  symbol_array[i].name; i++) {
 
 
 
 
 
 367
 368		if (val != symbol_array[i].mask)
 369			continue;
 
 370
 371		trace_seq_puts(p, symbol_array[i].name);
 372		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 373	}
 374
 375	if (ret == (const char *)(p->buffer + p->len))
 376		trace_seq_printf(p, "0x%llx", val);
 377
 378	trace_seq_putc(p, 0);
 379
 380	return ret;
 381}
 382EXPORT_SYMBOL(ftrace_print_symbols_seq_u64);
 383#endif
 384
 385const char *
 386ftrace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 387{
 388	int i;
 389	const char *ret = p->buffer + p->len;
 
 
 390
 391	for (i = 0; i < buf_len; i++)
 392		trace_seq_printf(p, "%s%2.2x", i == 0 ? "" : " ", buf[i]);
 393
 394	trace_seq_putc(p, 0);
 
 
 
 
 
 
 395
 396	return ret;
 397}
 398EXPORT_SYMBOL(ftrace_print_hex_seq);
 399
 400#ifdef CONFIG_KRETPROBES
 401static inline const char *kretprobed(const char *name)
 402{
 403	static const char tramp_name[] = "kretprobe_trampoline";
 404	int size = sizeof(tramp_name);
 405
 406	if (strncmp(tramp_name, name, size) == 0)
 407		return "[unknown/kretprobe'd]";
 408	return name;
 409}
 410#else
 411static inline const char *kretprobed(const char *name)
 
 
 
 412{
 413	return name;
 
 
 
 
 
 414}
 415#endif /* CONFIG_KRETPROBES */
 416
 417static int
 418seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
 419{
 420#ifdef CONFIG_KALLSYMS
 421	char str[KSYM_SYMBOL_LEN];
 422	const char *name;
 423
 424	kallsyms_lookup(address, NULL, NULL, NULL, str);
 
 
 425
 426	name = kretprobed(str);
 
 
 427
 428	return trace_seq_printf(s, fmt, name);
 429#endif
 430	return 1;
 
 
 431}
 432
 433static int
 434seq_print_sym_offset(struct trace_seq *s, const char *fmt,
 435		     unsigned long address)
 436{
 437#ifdef CONFIG_KALLSYMS
 438	char str[KSYM_SYMBOL_LEN];
 439	const char *name;
 440
 441	sprint_symbol(str, address);
 442	name = kretprobed(str);
 
 
 
 443
 444	return trace_seq_printf(s, fmt, name);
 
 
 
 445#endif
 446	return 1;
 447}
 448
 449#ifndef CONFIG_64BIT
 450# define IP_FMT "%08lx"
 451#else
 452# define IP_FMT "%016lx"
 453#endif
 454
 455int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 456		      unsigned long ip, unsigned long sym_flags)
 457{
 458	struct file *file = NULL;
 459	unsigned long vmstart = 0;
 460	int ret = 1;
 461
 462	if (s->full)
 463		return 0;
 464
 465	if (mm) {
 466		const struct vm_area_struct *vma;
 467
 468		down_read(&mm->mmap_sem);
 469		vma = find_vma(mm, ip);
 470		if (vma) {
 471			file = vma->vm_file;
 472			vmstart = vma->vm_start;
 473		}
 474		if (file) {
 475			ret = trace_seq_path(s, &file->f_path);
 476			if (ret)
 477				ret = trace_seq_printf(s, "[+0x%lx]",
 478						       ip - vmstart);
 479		}
 480		up_read(&mm->mmap_sem);
 481	}
 482	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 483		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 484	return ret;
 485}
 486
 487int
 488seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 489		      unsigned long sym_flags)
 490{
 491	struct mm_struct *mm = NULL;
 492	int ret = 1;
 493	unsigned int i;
 494
 495	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 496		struct task_struct *task;
 497		/*
 498		 * we do the lookup on the thread group leader,
 499		 * since individual threads might have already quit!
 500		 */
 501		rcu_read_lock();
 502		task = find_task_by_vpid(entry->tgid);
 503		if (task)
 504			mm = get_task_mm(task);
 505		rcu_read_unlock();
 506	}
 507
 508	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
 509		unsigned long ip = entry->caller[i];
 510
 511		if (ip == ULONG_MAX || !ret)
 512			break;
 513		if (ret)
 514			ret = trace_seq_puts(s, " => ");
 515		if (!ip) {
 516			if (ret)
 517				ret = trace_seq_puts(s, "??");
 518			if (ret)
 519				ret = trace_seq_puts(s, "\n");
 520			continue;
 521		}
 522		if (!ret)
 523			break;
 524		if (ret)
 525			ret = seq_print_user_ip(s, mm, ip, sym_flags);
 526		ret = trace_seq_puts(s, "\n");
 527	}
 528
 529	if (mm)
 530		mmput(mm);
 531	return ret;
 532}
 533
 534int
 535seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 536{
 537	int ret;
 538
 539	if (!ip)
 540		return trace_seq_printf(s, "0");
 541
 542	if (sym_flags & TRACE_ITER_SYM_OFFSET)
 543		ret = seq_print_sym_offset(s, "%s", ip);
 544	else
 545		ret = seq_print_sym_short(s, "%s", ip);
 546
 547	if (!ret)
 548		return 0;
 549
 550	if (sym_flags & TRACE_ITER_SYM_ADDR)
 551		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
 552	return ret;
 553}
 554
 555/**
 556 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 557 * @s: trace seq struct to write to
 558 * @entry: The trace entry field from the ring buffer
 559 *
 560 * Prints the generic fields of irqs off, in hard or softirq, preempt
 561 * count.
 562 */
 563int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 564{
 565	char hardsoft_irq;
 566	char need_resched;
 567	char irqs_off;
 568	int hardirq;
 569	int softirq;
 570	int ret;
 
 571
 
 572	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 573	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 
 574
 575	irqs_off =
 
 576		(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 
 577		(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 578		'.';
 579	need_resched =
 580		(entry->flags & TRACE_FLAG_NEED_RESCHED) ? 'N' : '.';
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 581	hardsoft_irq =
 
 
 582		(hardirq && softirq) ? 'H' :
 583		hardirq ? 'h' :
 584		softirq ? 's' :
 585		'.';
 
 
 
 586
 587	if (!trace_seq_printf(s, "%c%c%c",
 588			      irqs_off, need_resched, hardsoft_irq))
 589		return 0;
 
 590
 591	if (entry->preempt_count)
 592		ret = trace_seq_printf(s, "%x", entry->preempt_count);
 593	else
 594		ret = trace_seq_putc(s, '.');
 595
 596	return ret;
 597}
 598
 599static int
 600lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 601{
 602	char comm[TASK_COMM_LEN];
 603
 604	trace_find_cmdline(entry->pid, comm);
 605
 606	if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
 607			      comm, entry->pid, cpu))
 608		return 0;
 609
 610	return trace_print_lat_fmt(s, entry);
 611}
 612
 613static unsigned long preempt_mark_thresh = 100;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 614
 615static int
 616lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
 617		    unsigned long rel_usecs)
 618{
 619	return trace_seq_printf(s, " %4lldus%c: ", abs_usecs,
 620				rel_usecs > preempt_mark_thresh ? '!' :
 621				  rel_usecs > 1 ? '+' : ' ');
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 622}
 623
 624int trace_print_context(struct trace_iterator *iter)
 625{
 
 626	struct trace_seq *s = &iter->seq;
 627	struct trace_entry *entry = iter->ent;
 628	unsigned long long t = ns2usecs(iter->ts);
 629	unsigned long usec_rem = do_div(t, USEC_PER_SEC);
 630	unsigned long secs = (unsigned long)t;
 631	char comm[TASK_COMM_LEN];
 632	int ret;
 633
 634	trace_find_cmdline(entry->pid, comm);
 635
 636	ret = trace_seq_printf(s, "%16s-%-5d [%03d] ",
 637			       comm, entry->pid, iter->cpu);
 638	if (!ret)
 639		return 0;
 640
 641	if (trace_flags & TRACE_ITER_IRQ_INFO) {
 642		ret = trace_print_lat_fmt(s, entry);
 643		if (!ret)
 644			return 0;
 645	}
 646
 647	return trace_seq_printf(s, " %5lu.%06lu: ",
 648				secs, usec_rem);
 
 
 
 
 
 
 
 649}
 650
 651int trace_print_lat_context(struct trace_iterator *iter)
 652{
 
 
 
 
 653	u64 next_ts;
 654	int ret;
 655	/* trace_find_next_entry will reset ent_size */
 656	int ent_size = iter->ent_size;
 657	struct trace_seq *s = &iter->seq;
 658	struct trace_entry *entry = iter->ent,
 659			   *next_entry = trace_find_next_entry(iter, NULL,
 660							       &next_ts);
 661	unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
 662	unsigned long abs_usecs = ns2usecs(iter->ts - iter->tr->time_start);
 663	unsigned long rel_usecs;
 664
 665	/* Restore the original ent_size */
 666	iter->ent_size = ent_size;
 667
 
 668	if (!next_entry)
 669		next_ts = iter->ts;
 670	rel_usecs = ns2usecs(next_ts - iter->ts);
 
 
 671
 672	if (verbose) {
 673		char comm[TASK_COMM_LEN];
 674
 675		trace_find_cmdline(entry->pid, comm);
 676
 677		ret = trace_seq_printf(s, "%16s %5d %3d %d %08x %08lx [%08llx]"
 678				       " %ld.%03ldms (+%ld.%03ldms): ", comm,
 679				       entry->pid, iter->cpu, entry->flags,
 680				       entry->preempt_count, iter->idx,
 681				       ns2usecs(iter->ts),
 682				       abs_usecs / USEC_PER_MSEC,
 683				       abs_usecs % USEC_PER_MSEC,
 684				       rel_usecs / USEC_PER_MSEC,
 685				       rel_usecs % USEC_PER_MSEC);
 686	} else {
 687		ret = lat_print_generic(s, entry, iter->cpu);
 688		if (ret)
 689			ret = lat_print_timestamp(s, abs_usecs, rel_usecs);
 690	}
 691
 692	return ret;
 693}
 694
 695static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
 696
 697static int task_state_char(unsigned long state)
 698{
 699	int bit = state ? __ffs(state) + 1 : 0;
 700
 701	return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
 702}
 703
 704/**
 705 * ftrace_find_event - find a registered event
 706 * @type: the type of event to look for
 707 *
 708 * Returns an event of type @type otherwise NULL
 709 * Called with trace_event_read_lock() held.
 710 */
 711struct trace_event *ftrace_find_event(int type)
 712{
 713	struct trace_event *event;
 714	struct hlist_node *n;
 715	unsigned key;
 716
 717	key = type & (EVENT_HASHSIZE - 1);
 718
 719	hlist_for_each_entry(event, n, &event_hash[key], node) {
 720		if (event->type == type)
 721			return event;
 722	}
 723
 724	return NULL;
 725}
 726
 727static LIST_HEAD(ftrace_event_list);
 728
 729static int trace_search_list(struct list_head **list)
 730{
 731	struct trace_event *e;
 732	int last = __TRACE_LAST_TYPE;
 
 733
 734	if (list_empty(&ftrace_event_list)) {
 735		*list = &ftrace_event_list;
 736		return last + 1;
 737	}
 738
 739	/*
 740	 * We used up all possible max events,
 741	 * lets see if somebody freed one.
 742	 */
 743	list_for_each_entry(e, &ftrace_event_list, list) {
 744		if (e->type != last + 1)
 745			break;
 746		last++;
 747	}
 748
 749	/* Did we used up all 65 thousand events??? */
 750	if ((last + 1) > FTRACE_MAX_EVENT)
 751		return 0;
 752
 753	*list = &e->list;
 754	return last + 1;
 755}
 756
 757void trace_event_read_lock(void)
 758{
 759	down_read(&trace_event_mutex);
 760}
 761
 762void trace_event_read_unlock(void)
 763{
 764	up_read(&trace_event_mutex);
 765}
 766
 767/**
 768 * register_ftrace_event - register output for an event type
 769 * @event: the event type to register
 770 *
 771 * Event types are stored in a hash and this hash is used to
 772 * find a way to print an event. If the @event->type is set
 773 * then it will use that type, otherwise it will assign a
 774 * type to use.
 775 *
 776 * If you assign your own type, please make sure it is added
 777 * to the trace_type enum in trace.h, to avoid collisions
 778 * with the dynamic types.
 779 *
 780 * Returns the event type number or zero on error.
 781 */
 782int register_ftrace_event(struct trace_event *event)
 783{
 784	unsigned key;
 785	int ret = 0;
 786
 787	down_write(&trace_event_mutex);
 788
 789	if (WARN_ON(!event))
 790		goto out;
 791
 792	if (WARN_ON(!event->funcs))
 793		goto out;
 794
 795	INIT_LIST_HEAD(&event->list);
 796
 797	if (!event->type) {
 798		struct list_head *list = NULL;
 799
 800		if (next_event_type > FTRACE_MAX_EVENT) {
 801
 802			event->type = trace_search_list(&list);
 803			if (!event->type)
 804				goto out;
 805
 806		} else {
 807			
 808			event->type = next_event_type++;
 809			list = &ftrace_event_list;
 810		}
 811
 812		if (WARN_ON(ftrace_find_event(event->type)))
 813			goto out;
 814
 815		list_add_tail(&event->list, list);
 816
 817	} else if (event->type > __TRACE_LAST_TYPE) {
 818		printk(KERN_WARNING "Need to add type to trace.h\n");
 819		WARN_ON(1);
 820		goto out;
 821	} else {
 822		/* Is this event already used */
 823		if (ftrace_find_event(event->type))
 824			goto out;
 825	}
 826
 827	if (event->funcs->trace == NULL)
 828		event->funcs->trace = trace_nop_print;
 829	if (event->funcs->raw == NULL)
 830		event->funcs->raw = trace_nop_print;
 831	if (event->funcs->hex == NULL)
 832		event->funcs->hex = trace_nop_print;
 833	if (event->funcs->binary == NULL)
 834		event->funcs->binary = trace_nop_print;
 835
 836	key = event->type & (EVENT_HASHSIZE - 1);
 837
 838	hlist_add_head(&event->node, &event_hash[key]);
 839
 840	ret = event->type;
 841 out:
 842	up_write(&trace_event_mutex);
 843
 844	return ret;
 845}
 846EXPORT_SYMBOL_GPL(register_ftrace_event);
 847
 848/*
 849 * Used by module code with the trace_event_mutex held for write.
 850 */
 851int __unregister_ftrace_event(struct trace_event *event)
 852{
 853	hlist_del(&event->node);
 854	list_del(&event->list);
 855	return 0;
 856}
 857
 858/**
 859 * unregister_ftrace_event - remove a no longer used event
 860 * @event: the event to remove
 861 */
 862int unregister_ftrace_event(struct trace_event *event)
 863{
 864	down_write(&trace_event_mutex);
 865	__unregister_ftrace_event(event);
 866	up_write(&trace_event_mutex);
 867
 868	return 0;
 869}
 870EXPORT_SYMBOL_GPL(unregister_ftrace_event);
 871
 872/*
 873 * Standard events
 874 */
 875
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 876enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 877				  struct trace_event *event)
 878{
 879	if (!trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type))
 880		return TRACE_TYPE_PARTIAL_LINE;
 
 
 
 
 
 
 
 881
 882	return TRACE_TYPE_HANDLED;
 
 
 
 883}
 884
 885/* TRACE_FN */
 886static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 887					struct trace_event *event)
 888{
 889	struct ftrace_entry *field;
 890	struct trace_seq *s = &iter->seq;
 891
 892	trace_assign_type(field, iter->ent);
 893
 894	if (!seq_print_ip_sym(s, field->ip, flags))
 895		goto partial;
 896
 897	if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 898		if (!trace_seq_printf(s, " <-"))
 899			goto partial;
 900		if (!seq_print_ip_sym(s,
 901				      field->parent_ip,
 902				      flags))
 903			goto partial;
 904	}
 905	if (!trace_seq_printf(s, "\n"))
 906		goto partial;
 907
 908	return TRACE_TYPE_HANDLED;
 909
 910 partial:
 911	return TRACE_TYPE_PARTIAL_LINE;
 912}
 913
 914static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 915				      struct trace_event *event)
 916{
 917	struct ftrace_entry *field;
 918
 919	trace_assign_type(field, iter->ent);
 920
 921	if (!trace_seq_printf(&iter->seq, "%lx %lx\n",
 922			      field->ip,
 923			      field->parent_ip))
 924		return TRACE_TYPE_PARTIAL_LINE;
 925
 926	return TRACE_TYPE_HANDLED;
 927}
 928
 929static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
 930				      struct trace_event *event)
 931{
 932	struct ftrace_entry *field;
 933	struct trace_seq *s = &iter->seq;
 934
 935	trace_assign_type(field, iter->ent);
 936
 937	SEQ_PUT_HEX_FIELD_RET(s, field->ip);
 938	SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
 939
 940	return TRACE_TYPE_HANDLED;
 941}
 942
 943static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
 944				      struct trace_event *event)
 945{
 946	struct ftrace_entry *field;
 947	struct trace_seq *s = &iter->seq;
 948
 949	trace_assign_type(field, iter->ent);
 950
 951	SEQ_PUT_FIELD_RET(s, field->ip);
 952	SEQ_PUT_FIELD_RET(s, field->parent_ip);
 953
 954	return TRACE_TYPE_HANDLED;
 955}
 956
 957static struct trace_event_functions trace_fn_funcs = {
 958	.trace		= trace_fn_trace,
 959	.raw		= trace_fn_raw,
 960	.hex		= trace_fn_hex,
 961	.binary		= trace_fn_bin,
 962};
 963
 964static struct trace_event trace_fn_event = {
 965	.type		= TRACE_FN,
 966	.funcs		= &trace_fn_funcs,
 967};
 968
 969/* TRACE_CTX an TRACE_WAKE */
 970static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 971					     char *delim)
 972{
 973	struct ctx_switch_entry *field;
 974	char comm[TASK_COMM_LEN];
 975	int S, T;
 976
 977
 978	trace_assign_type(field, iter->ent);
 979
 980	T = task_state_char(field->next_state);
 981	S = task_state_char(field->prev_state);
 982	trace_find_cmdline(field->next_pid, comm);
 983	if (!trace_seq_printf(&iter->seq,
 984			      " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 985			      field->prev_pid,
 986			      field->prev_prio,
 987			      S, delim,
 988			      field->next_cpu,
 989			      field->next_pid,
 990			      field->next_prio,
 991			      T, comm))
 992		return TRACE_TYPE_PARTIAL_LINE;
 993
 994	return TRACE_TYPE_HANDLED;
 995}
 996
 997static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
 998					 struct trace_event *event)
 999{
1000	return trace_ctxwake_print(iter, "==>");
1001}
1002
1003static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1004					  int flags, struct trace_event *event)
1005{
1006	return trace_ctxwake_print(iter, "  +");
1007}
1008
1009static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1010{
1011	struct ctx_switch_entry *field;
1012	int T;
1013
1014	trace_assign_type(field, iter->ent);
1015
1016	if (!S)
1017		S = task_state_char(field->prev_state);
1018	T = task_state_char(field->next_state);
1019	if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1020			      field->prev_pid,
1021			      field->prev_prio,
1022			      S,
1023			      field->next_cpu,
1024			      field->next_pid,
1025			      field->next_prio,
1026			      T))
1027		return TRACE_TYPE_PARTIAL_LINE;
1028
1029	return TRACE_TYPE_HANDLED;
1030}
1031
1032static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1033				       struct trace_event *event)
1034{
1035	return trace_ctxwake_raw(iter, 0);
1036}
1037
1038static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1039					struct trace_event *event)
1040{
1041	return trace_ctxwake_raw(iter, '+');
1042}
1043
1044
1045static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1046{
1047	struct ctx_switch_entry *field;
1048	struct trace_seq *s = &iter->seq;
1049	int T;
1050
1051	trace_assign_type(field, iter->ent);
1052
1053	if (!S)
1054		S = task_state_char(field->prev_state);
1055	T = task_state_char(field->next_state);
1056
1057	SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
1058	SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
1059	SEQ_PUT_HEX_FIELD_RET(s, S);
1060	SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
1061	SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
1062	SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
1063	SEQ_PUT_HEX_FIELD_RET(s, T);
1064
1065	return TRACE_TYPE_HANDLED;
1066}
1067
1068static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1069				       struct trace_event *event)
1070{
1071	return trace_ctxwake_hex(iter, 0);
1072}
1073
1074static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1075					struct trace_event *event)
1076{
1077	return trace_ctxwake_hex(iter, '+');
1078}
1079
1080static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1081					   int flags, struct trace_event *event)
1082{
1083	struct ctx_switch_entry *field;
1084	struct trace_seq *s = &iter->seq;
1085
1086	trace_assign_type(field, iter->ent);
1087
1088	SEQ_PUT_FIELD_RET(s, field->prev_pid);
1089	SEQ_PUT_FIELD_RET(s, field->prev_prio);
1090	SEQ_PUT_FIELD_RET(s, field->prev_state);
1091	SEQ_PUT_FIELD_RET(s, field->next_pid);
1092	SEQ_PUT_FIELD_RET(s, field->next_prio);
1093	SEQ_PUT_FIELD_RET(s, field->next_state);
 
1094
1095	return TRACE_TYPE_HANDLED;
1096}
1097
1098static struct trace_event_functions trace_ctx_funcs = {
1099	.trace		= trace_ctx_print,
1100	.raw		= trace_ctx_raw,
1101	.hex		= trace_ctx_hex,
1102	.binary		= trace_ctxwake_bin,
1103};
1104
1105static struct trace_event trace_ctx_event = {
1106	.type		= TRACE_CTX,
1107	.funcs		= &trace_ctx_funcs,
1108};
1109
1110static struct trace_event_functions trace_wake_funcs = {
1111	.trace		= trace_wake_print,
1112	.raw		= trace_wake_raw,
1113	.hex		= trace_wake_hex,
1114	.binary		= trace_ctxwake_bin,
1115};
1116
1117static struct trace_event trace_wake_event = {
1118	.type		= TRACE_WAKE,
1119	.funcs		= &trace_wake_funcs,
1120};
1121
1122/* TRACE_STACK */
1123
1124static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1125					   int flags, struct trace_event *event)
1126{
1127	struct stack_entry *field;
1128	struct trace_seq *s = &iter->seq;
1129	unsigned long *p;
1130	unsigned long *end;
1131
1132	trace_assign_type(field, iter->ent);
1133	end = (unsigned long *)((long)iter->ent + iter->ent_size);
1134
1135	if (!trace_seq_puts(s, "<stack trace>\n"))
1136		goto partial;
1137
1138	for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1139		if (!trace_seq_puts(s, " => "))
1140			goto partial;
 
1141
1142		if (!seq_print_ip_sym(s, *p, flags))
1143			goto partial;
1144		if (!trace_seq_puts(s, "\n"))
1145			goto partial;
1146	}
1147
1148	return TRACE_TYPE_HANDLED;
1149
1150 partial:
1151	return TRACE_TYPE_PARTIAL_LINE;
1152}
1153
1154static struct trace_event_functions trace_stack_funcs = {
1155	.trace		= trace_stack_print,
1156};
1157
1158static struct trace_event trace_stack_event = {
1159	.type		= TRACE_STACK,
1160	.funcs		= &trace_stack_funcs,
1161};
1162
1163/* TRACE_USER_STACK */
1164static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1165						int flags, struct trace_event *event)
1166{
 
1167	struct userstack_entry *field;
1168	struct trace_seq *s = &iter->seq;
 
 
1169
1170	trace_assign_type(field, iter->ent);
1171
1172	if (!trace_seq_puts(s, "<user stack trace>\n"))
1173		goto partial;
1174
1175	if (!seq_print_userip_objs(field, s, flags))
1176		goto partial;
 
 
 
 
 
 
 
 
 
 
1177
1178	return TRACE_TYPE_HANDLED;
 
 
 
 
1179
1180 partial:
1181	return TRACE_TYPE_PARTIAL_LINE;
 
 
 
 
 
 
 
1182}
1183
1184static struct trace_event_functions trace_user_stack_funcs = {
1185	.trace		= trace_user_stack_print,
1186};
1187
1188static struct trace_event trace_user_stack_event = {
1189	.type		= TRACE_USER_STACK,
1190	.funcs		= &trace_user_stack_funcs,
1191};
1192
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1193/* TRACE_BPRINT */
1194static enum print_line_t
1195trace_bprint_print(struct trace_iterator *iter, int flags,
1196		   struct trace_event *event)
1197{
1198	struct trace_entry *entry = iter->ent;
1199	struct trace_seq *s = &iter->seq;
1200	struct bprint_entry *field;
1201
1202	trace_assign_type(field, entry);
1203
1204	if (!seq_print_ip_sym(s, field->ip, flags))
1205		goto partial;
 
1206
1207	if (!trace_seq_puts(s, ": "))
1208		goto partial;
1209
1210	if (!trace_seq_bprintf(s, field->fmt, field->buf))
1211		goto partial;
1212
1213	return TRACE_TYPE_HANDLED;
1214
1215 partial:
1216	return TRACE_TYPE_PARTIAL_LINE;
1217}
1218
1219
1220static enum print_line_t
1221trace_bprint_raw(struct trace_iterator *iter, int flags,
1222		 struct trace_event *event)
1223{
1224	struct bprint_entry *field;
1225	struct trace_seq *s = &iter->seq;
1226
1227	trace_assign_type(field, iter->ent);
1228
1229	if (!trace_seq_printf(s, ": %lx : ", field->ip))
1230		goto partial;
1231
1232	if (!trace_seq_bprintf(s, field->fmt, field->buf))
1233		goto partial;
1234
1235	return TRACE_TYPE_HANDLED;
1236
1237 partial:
1238	return TRACE_TYPE_PARTIAL_LINE;
1239}
1240
1241static struct trace_event_functions trace_bprint_funcs = {
1242	.trace		= trace_bprint_print,
1243	.raw		= trace_bprint_raw,
1244};
1245
1246static struct trace_event trace_bprint_event = {
1247	.type		= TRACE_BPRINT,
1248	.funcs		= &trace_bprint_funcs,
1249};
1250
1251/* TRACE_PRINT */
1252static enum print_line_t trace_print_print(struct trace_iterator *iter,
1253					   int flags, struct trace_event *event)
1254{
1255	struct print_entry *field;
1256	struct trace_seq *s = &iter->seq;
1257
1258	trace_assign_type(field, iter->ent);
1259
1260	if (!seq_print_ip_sym(s, field->ip, flags))
1261		goto partial;
1262
1263	if (!trace_seq_printf(s, ": %s", field->buf))
1264		goto partial;
1265
1266	return TRACE_TYPE_HANDLED;
1267
1268 partial:
1269	return TRACE_TYPE_PARTIAL_LINE;
1270}
1271
1272static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1273					 struct trace_event *event)
1274{
1275	struct print_entry *field;
1276
1277	trace_assign_type(field, iter->ent);
1278
1279	if (!trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf))
1280		goto partial;
1281
1282	return TRACE_TYPE_HANDLED;
1283
1284 partial:
1285	return TRACE_TYPE_PARTIAL_LINE;
1286}
1287
1288static struct trace_event_functions trace_print_funcs = {
1289	.trace		= trace_print_print,
1290	.raw		= trace_print_raw,
1291};
1292
1293static struct trace_event trace_print_event = {
1294	.type	 	= TRACE_PRINT,
1295	.funcs		= &trace_print_funcs,
1296};
1297
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1298
1299static struct trace_event *events[] __initdata = {
1300	&trace_fn_event,
1301	&trace_ctx_event,
1302	&trace_wake_event,
1303	&trace_stack_event,
1304	&trace_user_stack_event,
 
1305	&trace_bprint_event,
1306	&trace_print_event,
 
 
 
 
 
1307	NULL
1308};
1309
1310__init static int init_events(void)
1311{
1312	struct trace_event *event;
1313	int i, ret;
1314
1315	for (i = 0; events[i]; i++) {
1316		event = events[i];
1317
1318		ret = register_ftrace_event(event);
1319		if (!ret) {
1320			printk(KERN_WARNING "event %d failed to register\n",
1321			       event->type);
1322			WARN_ON_ONCE(1);
1323		}
1324	}
1325
1326	return 0;
1327}
1328device_initcall(init_events);