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v5.4
   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/sched/clock.h>
  12#include <linux/sched/mm.h>
 
  13
  14#include "trace_output.h"
  15
  16/* must be a power of 2 */
  17#define EVENT_HASHSIZE	128
  18
  19DECLARE_RWSEM(trace_event_sem);
  20
  21static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
  22
  23static int next_event_type = __TRACE_LAST_TYPE + 1;
  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		trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
 
 226	trace_seq_putc(p, 0);
 227
 228	return ret;
 229}
 230EXPORT_SYMBOL(trace_print_hex_seq);
 231
 232const char *
 233trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
 234		      size_t el_size)
 235{
 236	const char *ret = trace_seq_buffer_ptr(p);
 237	const char *prefix = "";
 238	void *ptr = (void *)buf;
 239	size_t buf_len = count * el_size;
 240
 241	trace_seq_putc(p, '{');
 242
 243	while (ptr < buf + buf_len) {
 244		switch (el_size) {
 245		case 1:
 246			trace_seq_printf(p, "%s0x%x", prefix,
 247					 *(u8 *)ptr);
 248			break;
 249		case 2:
 250			trace_seq_printf(p, "%s0x%x", prefix,
 251					 *(u16 *)ptr);
 252			break;
 253		case 4:
 254			trace_seq_printf(p, "%s0x%x", prefix,
 255					 *(u32 *)ptr);
 256			break;
 257		case 8:
 258			trace_seq_printf(p, "%s0x%llx", prefix,
 259					 *(u64 *)ptr);
 260			break;
 261		default:
 262			trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
 263					 *(u8 *)ptr);
 264			el_size = 1;
 265		}
 266		prefix = ",";
 267		ptr += el_size;
 268	}
 269
 270	trace_seq_putc(p, '}');
 271	trace_seq_putc(p, 0);
 272
 273	return ret;
 274}
 275EXPORT_SYMBOL(trace_print_array_seq);
 276
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 277int trace_raw_output_prep(struct trace_iterator *iter,
 278			  struct trace_event *trace_event)
 279{
 280	struct trace_event_call *event;
 281	struct trace_seq *s = &iter->seq;
 282	struct trace_seq *p = &iter->tmp_seq;
 283	struct trace_entry *entry;
 284
 285	event = container_of(trace_event, struct trace_event_call, event);
 286	entry = iter->ent;
 287
 288	if (entry->type != event->event.type) {
 289		WARN_ON_ONCE(1);
 290		return TRACE_TYPE_UNHANDLED;
 291	}
 292
 293	trace_seq_init(p);
 294	trace_seq_printf(s, "%s: ", trace_event_name(event));
 295
 296	return trace_handle_return(s);
 297}
 298EXPORT_SYMBOL(trace_raw_output_prep);
 299
 300static int trace_output_raw(struct trace_iterator *iter, char *name,
 301			    char *fmt, va_list ap)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 302{
 303	struct trace_seq *s = &iter->seq;
 304
 305	trace_seq_printf(s, "%s: ", name);
 306	trace_seq_vprintf(s, fmt, ap);
 307
 308	return trace_handle_return(s);
 309}
 310
 311int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 312{
 313	va_list ap;
 314	int ret;
 315
 316	va_start(ap, fmt);
 317	ret = trace_output_raw(iter, name, fmt, ap);
 318	va_end(ap);
 319
 320	return ret;
 321}
 322EXPORT_SYMBOL_GPL(trace_output_call);
 323
 324#ifdef CONFIG_KRETPROBES
 325static inline const char *kretprobed(const char *name)
 326{
 327	static const char tramp_name[] = "kretprobe_trampoline";
 328	int size = sizeof(tramp_name);
 329
 330	if (strncmp(tramp_name, name, size) == 0)
 331		return "[unknown/kretprobe'd]";
 332	return name;
 333}
 334#else
 335static inline const char *kretprobed(const char *name)
 336{
 337	return name;
 338}
 339#endif /* CONFIG_KRETPROBES */
 340
 341static void
 342seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
 343{
 344#ifdef CONFIG_KALLSYMS
 345	char str[KSYM_SYMBOL_LEN];
 346	const char *name;
 347
 348	if (offset)
 349		sprint_symbol(str, address);
 350	else
 351		kallsyms_lookup(address, NULL, NULL, NULL, str);
 352	name = kretprobed(str);
 353
 354	if (name && strlen(name)) {
 355		trace_seq_puts(s, name);
 356		return;
 357	}
 358#endif
 359	trace_seq_printf(s, "0x%08lx", address);
 360}
 361
 362#ifndef CONFIG_64BIT
 363# define IP_FMT "%08lx"
 364#else
 365# define IP_FMT "%016lx"
 366#endif
 367
 368static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 369			     unsigned long ip, unsigned long sym_flags)
 370{
 371	struct file *file = NULL;
 372	unsigned long vmstart = 0;
 373	int ret = 1;
 374
 375	if (s->full)
 376		return 0;
 377
 378	if (mm) {
 379		const struct vm_area_struct *vma;
 380
 381		down_read(&mm->mmap_sem);
 382		vma = find_vma(mm, ip);
 383		if (vma) {
 384			file = vma->vm_file;
 385			vmstart = vma->vm_start;
 386		}
 387		if (file) {
 388			ret = trace_seq_path(s, &file->f_path);
 389			if (ret)
 390				trace_seq_printf(s, "[+0x%lx]",
 391						 ip - vmstart);
 392		}
 393		up_read(&mm->mmap_sem);
 394	}
 395	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 396		trace_seq_printf(s, " <" IP_FMT ">", ip);
 397	return !trace_seq_has_overflowed(s);
 398}
 399
 400int
 401seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 402{
 403	if (!ip) {
 404		trace_seq_putc(s, '0');
 405		goto out;
 406	}
 407
 408	seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
 409
 410	if (sym_flags & TRACE_ITER_SYM_ADDR)
 411		trace_seq_printf(s, " <" IP_FMT ">", ip);
 412
 413 out:
 414	return !trace_seq_has_overflowed(s);
 415}
 416
 417/**
 418 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 419 * @s: trace seq struct to write to
 420 * @entry: The trace entry field from the ring buffer
 421 *
 422 * Prints the generic fields of irqs off, in hard or softirq, preempt
 423 * count.
 424 */
 425int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 426{
 427	char hardsoft_irq;
 428	char need_resched;
 429	char irqs_off;
 430	int hardirq;
 431	int softirq;
 
 432	int nmi;
 433
 434	nmi = entry->flags & TRACE_FLAG_NMI;
 435	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 436	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 
 437
 438	irqs_off =
 
 439		(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 440		(entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
 441		'.';
 442
 443	switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
 444				TRACE_FLAG_PREEMPT_RESCHED)) {
 
 
 
 445	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 446		need_resched = 'N';
 447		break;
 
 
 
 
 
 
 448	case TRACE_FLAG_NEED_RESCHED:
 449		need_resched = 'n';
 450		break;
 451	case TRACE_FLAG_PREEMPT_RESCHED:
 452		need_resched = 'p';
 453		break;
 
 
 
 454	default:
 455		need_resched = '.';
 456		break;
 457	}
 458
 459	hardsoft_irq =
 460		(nmi && hardirq)     ? 'Z' :
 461		nmi                  ? 'z' :
 462		(hardirq && softirq) ? 'H' :
 463		hardirq              ? 'h' :
 464		softirq              ? 's' :
 465		                       '.' ;
 466
 467	trace_seq_printf(s, "%c%c%c",
 468			 irqs_off, need_resched, hardsoft_irq);
 469
 470	if (entry->preempt_count)
 471		trace_seq_printf(s, "%x", entry->preempt_count);
 
 
 
 
 
 472	else
 473		trace_seq_putc(s, '.');
 474
 475	return !trace_seq_has_overflowed(s);
 476}
 477
 478static int
 479lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 480{
 481	char comm[TASK_COMM_LEN];
 482
 483	trace_find_cmdline(entry->pid, comm);
 484
 485	trace_seq_printf(s, "%8.8s-%-5d %3d",
 486			 comm, entry->pid, cpu);
 487
 488	return trace_print_lat_fmt(s, entry);
 489}
 490
 491#undef MARK
 492#define MARK(v, s) {.val = v, .sym = s}
 493/* trace overhead mark */
 494static const struct trace_mark {
 495	unsigned long long	val; /* unit: nsec */
 496	char			sym;
 497} mark[] = {
 498	MARK(1000000000ULL	, '$'), /* 1 sec */
 499	MARK(100000000ULL	, '@'), /* 100 msec */
 500	MARK(10000000ULL	, '*'), /* 10 msec */
 501	MARK(1000000ULL		, '#'), /* 1000 usecs */
 502	MARK(100000ULL		, '!'), /* 100 usecs */
 503	MARK(10000ULL		, '+'), /* 10 usecs */
 504};
 505#undef MARK
 506
 507char trace_find_mark(unsigned long long d)
 508{
 509	int i;
 510	int size = ARRAY_SIZE(mark);
 511
 512	for (i = 0; i < size; i++) {
 513		if (d > mark[i].val)
 514			break;
 515	}
 516
 517	return (i == size) ? ' ' : mark[i].sym;
 518}
 519
 520static int
 521lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 522{
 523	struct trace_array *tr = iter->tr;
 524	unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 525	unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 526	unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
 527	unsigned long long rel_ts = next_ts - iter->ts;
 528	struct trace_seq *s = &iter->seq;
 529
 530	if (in_ns) {
 531		abs_ts = ns2usecs(abs_ts);
 532		rel_ts = ns2usecs(rel_ts);
 533	}
 534
 535	if (verbose && in_ns) {
 536		unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 537		unsigned long abs_msec = (unsigned long)abs_ts;
 538		unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 539		unsigned long rel_msec = (unsigned long)rel_ts;
 540
 541		trace_seq_printf(
 542			s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 543			ns2usecs(iter->ts),
 544			abs_msec, abs_usec,
 545			rel_msec, rel_usec);
 546
 547	} else if (verbose && !in_ns) {
 548		trace_seq_printf(
 549			s, "[%016llx] %lld (+%lld): ",
 550			iter->ts, abs_ts, rel_ts);
 551
 552	} else if (!verbose && in_ns) {
 553		trace_seq_printf(
 554			s, " %4lldus%c: ",
 555			abs_ts,
 556			trace_find_mark(rel_ts * NSEC_PER_USEC));
 557
 558	} else { /* !verbose && !in_ns */
 559		trace_seq_printf(s, " %4lld: ", abs_ts);
 560	}
 561
 562	return !trace_seq_has_overflowed(s);
 563}
 564
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 565int trace_print_context(struct trace_iterator *iter)
 566{
 567	struct trace_array *tr = iter->tr;
 568	struct trace_seq *s = &iter->seq;
 569	struct trace_entry *entry = iter->ent;
 570	unsigned long long t;
 571	unsigned long secs, usec_rem;
 572	char comm[TASK_COMM_LEN];
 573
 574	trace_find_cmdline(entry->pid, comm);
 575
 576	trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
 577
 578	if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
 579		unsigned int tgid = trace_find_tgid(entry->pid);
 580
 581		if (!tgid)
 582			trace_seq_printf(s, "(-----) ");
 583		else
 584			trace_seq_printf(s, "(%5d) ", tgid);
 585	}
 586
 587	trace_seq_printf(s, "[%03d] ", iter->cpu);
 588
 589	if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 590		trace_print_lat_fmt(s, entry);
 591
 592	if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 593		t = ns2usecs(iter->ts);
 594		usec_rem = do_div(t, USEC_PER_SEC);
 595		secs = (unsigned long)t;
 596		trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
 597	} else
 598		trace_seq_printf(s, " %12llu: ", iter->ts);
 599
 600	return !trace_seq_has_overflowed(s);
 601}
 602
 603int trace_print_lat_context(struct trace_iterator *iter)
 604{
 
 605	struct trace_array *tr = iter->tr;
 606	/* trace_find_next_entry will reset ent_size */
 607	int ent_size = iter->ent_size;
 608	struct trace_seq *s = &iter->seq;
 609	u64 next_ts;
 610	struct trace_entry *entry = iter->ent,
 611			   *next_entry = trace_find_next_entry(iter, NULL,
 612							       &next_ts);
 613	unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 
 614
 615	/* Restore the original ent_size */
 616	iter->ent_size = ent_size;
 617
 618	if (!next_entry)
 619		next_ts = iter->ts;
 620
 
 
 
 621	if (verbose) {
 622		char comm[TASK_COMM_LEN];
 623
 624		trace_find_cmdline(entry->pid, comm);
 625
 626		trace_seq_printf(
 627			s, "%16s %5d %3d %d %08x %08lx ",
 628			comm, entry->pid, iter->cpu, entry->flags,
 629			entry->preempt_count, iter->idx);
 630	} else {
 631		lat_print_generic(s, entry, iter->cpu);
 632	}
 633
 634	lat_print_timestamp(iter, next_ts);
 635
 636	return !trace_seq_has_overflowed(s);
 637}
 638
 639/**
 640 * ftrace_find_event - find a registered event
 641 * @type: the type of event to look for
 642 *
 643 * Returns an event of type @type otherwise NULL
 644 * Called with trace_event_read_lock() held.
 645 */
 646struct trace_event *ftrace_find_event(int type)
 647{
 648	struct trace_event *event;
 649	unsigned key;
 650
 651	key = type & (EVENT_HASHSIZE - 1);
 652
 653	hlist_for_each_entry(event, &event_hash[key], node) {
 654		if (event->type == type)
 655			return event;
 656	}
 657
 658	return NULL;
 659}
 660
 661static LIST_HEAD(ftrace_event_list);
 662
 663static int trace_search_list(struct list_head **list)
 664{
 665	struct trace_event *e;
 666	int last = __TRACE_LAST_TYPE;
 667
 668	if (list_empty(&ftrace_event_list)) {
 669		*list = &ftrace_event_list;
 670		return last + 1;
 671	}
 672
 673	/*
 674	 * We used up all possible max events,
 675	 * lets see if somebody freed one.
 676	 */
 677	list_for_each_entry(e, &ftrace_event_list, list) {
 678		if (e->type != last + 1)
 679			break;
 680		last++;
 681	}
 682
 683	/* Did we used up all 65 thousand events??? */
 684	if ((last + 1) > TRACE_EVENT_TYPE_MAX)
 
 
 685		return 0;
 686
 687	*list = &e->list;
 688	return last + 1;
 689}
 690
 691void trace_event_read_lock(void)
 692{
 693	down_read(&trace_event_sem);
 694}
 695
 696void trace_event_read_unlock(void)
 697{
 698	up_read(&trace_event_sem);
 699}
 700
 701/**
 702 * register_trace_event - register output for an event type
 703 * @event: the event type to register
 704 *
 705 * Event types are stored in a hash and this hash is used to
 706 * find a way to print an event. If the @event->type is set
 707 * then it will use that type, otherwise it will assign a
 708 * type to use.
 709 *
 710 * If you assign your own type, please make sure it is added
 711 * to the trace_type enum in trace.h, to avoid collisions
 712 * with the dynamic types.
 713 *
 714 * Returns the event type number or zero on error.
 715 */
 716int register_trace_event(struct trace_event *event)
 717{
 718	unsigned key;
 719	int ret = 0;
 720
 721	down_write(&trace_event_sem);
 722
 723	if (WARN_ON(!event))
 724		goto out;
 725
 726	if (WARN_ON(!event->funcs))
 727		goto out;
 728
 729	INIT_LIST_HEAD(&event->list);
 730
 731	if (!event->type) {
 732		struct list_head *list = NULL;
 733
 734		if (next_event_type > TRACE_EVENT_TYPE_MAX) {
 735
 736			event->type = trace_search_list(&list);
 737			if (!event->type)
 738				goto out;
 739
 740		} else {
 741
 742			event->type = next_event_type++;
 743			list = &ftrace_event_list;
 744		}
 745
 746		if (WARN_ON(ftrace_find_event(event->type)))
 747			goto out;
 748
 749		list_add_tail(&event->list, list);
 750
 751	} else if (event->type > __TRACE_LAST_TYPE) {
 752		printk(KERN_WARNING "Need to add type to trace.h\n");
 753		WARN_ON(1);
 754		goto out;
 755	} else {
 756		/* Is this event already used */
 757		if (ftrace_find_event(event->type))
 758			goto out;
 759	}
 760
 761	if (event->funcs->trace == NULL)
 762		event->funcs->trace = trace_nop_print;
 763	if (event->funcs->raw == NULL)
 764		event->funcs->raw = trace_nop_print;
 765	if (event->funcs->hex == NULL)
 766		event->funcs->hex = trace_nop_print;
 767	if (event->funcs->binary == NULL)
 768		event->funcs->binary = trace_nop_print;
 769
 770	key = event->type & (EVENT_HASHSIZE - 1);
 771
 772	hlist_add_head(&event->node, &event_hash[key]);
 773
 774	ret = event->type;
 775 out:
 776	up_write(&trace_event_sem);
 777
 778	return ret;
 779}
 780EXPORT_SYMBOL_GPL(register_trace_event);
 781
 782/*
 783 * Used by module code with the trace_event_sem held for write.
 784 */
 785int __unregister_trace_event(struct trace_event *event)
 786{
 787	hlist_del(&event->node);
 788	list_del(&event->list);
 789	return 0;
 790}
 791
 792/**
 793 * unregister_trace_event - remove a no longer used event
 794 * @event: the event to remove
 795 */
 796int unregister_trace_event(struct trace_event *event)
 797{
 798	down_write(&trace_event_sem);
 799	__unregister_trace_event(event);
 800	up_write(&trace_event_sem);
 801
 802	return 0;
 803}
 804EXPORT_SYMBOL_GPL(unregister_trace_event);
 805
 806/*
 807 * Standard events
 808 */
 809
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 810enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
 811				  struct trace_event *event)
 812{
 813	trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
 814
 815	return trace_handle_return(&iter->seq);
 816}
 817
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 818/* TRACE_FN */
 819static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
 820					struct trace_event *event)
 821{
 822	struct ftrace_entry *field;
 823	struct trace_seq *s = &iter->seq;
 824
 825	trace_assign_type(field, iter->ent);
 826
 827	seq_print_ip_sym(s, field->ip, flags);
 828
 829	if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
 830		trace_seq_puts(s, " <-");
 831		seq_print_ip_sym(s, field->parent_ip, flags);
 832	}
 833
 834	trace_seq_putc(s, '\n');
 835
 836	return trace_handle_return(s);
 837}
 838
 839static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
 840				      struct trace_event *event)
 841{
 842	struct ftrace_entry *field;
 843
 844	trace_assign_type(field, iter->ent);
 845
 846	trace_seq_printf(&iter->seq, "%lx %lx\n",
 847			 field->ip,
 848			 field->parent_ip);
 849
 850	return trace_handle_return(&iter->seq);
 851}
 852
 853static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
 854				      struct trace_event *event)
 855{
 856	struct ftrace_entry *field;
 857	struct trace_seq *s = &iter->seq;
 858
 859	trace_assign_type(field, iter->ent);
 860
 861	SEQ_PUT_HEX_FIELD(s, field->ip);
 862	SEQ_PUT_HEX_FIELD(s, field->parent_ip);
 863
 864	return trace_handle_return(s);
 865}
 866
 867static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
 868				      struct trace_event *event)
 869{
 870	struct ftrace_entry *field;
 871	struct trace_seq *s = &iter->seq;
 872
 873	trace_assign_type(field, iter->ent);
 874
 875	SEQ_PUT_FIELD(s, field->ip);
 876	SEQ_PUT_FIELD(s, field->parent_ip);
 877
 878	return trace_handle_return(s);
 879}
 880
 881static struct trace_event_functions trace_fn_funcs = {
 882	.trace		= trace_fn_trace,
 883	.raw		= trace_fn_raw,
 884	.hex		= trace_fn_hex,
 885	.binary		= trace_fn_bin,
 886};
 887
 888static struct trace_event trace_fn_event = {
 889	.type		= TRACE_FN,
 890	.funcs		= &trace_fn_funcs,
 891};
 892
 893/* TRACE_CTX an TRACE_WAKE */
 894static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
 895					     char *delim)
 896{
 897	struct ctx_switch_entry *field;
 898	char comm[TASK_COMM_LEN];
 899	int S, T;
 900
 901
 902	trace_assign_type(field, iter->ent);
 903
 904	T = task_index_to_char(field->next_state);
 905	S = task_index_to_char(field->prev_state);
 906	trace_find_cmdline(field->next_pid, comm);
 907	trace_seq_printf(&iter->seq,
 908			 " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
 909			 field->prev_pid,
 910			 field->prev_prio,
 911			 S, delim,
 912			 field->next_cpu,
 913			 field->next_pid,
 914			 field->next_prio,
 915			 T, comm);
 916
 917	return trace_handle_return(&iter->seq);
 918}
 919
 920static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
 921					 struct trace_event *event)
 922{
 923	return trace_ctxwake_print(iter, "==>");
 924}
 925
 926static enum print_line_t trace_wake_print(struct trace_iterator *iter,
 927					  int flags, struct trace_event *event)
 928{
 929	return trace_ctxwake_print(iter, "  +");
 930}
 931
 932static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
 933{
 934	struct ctx_switch_entry *field;
 935	int T;
 936
 937	trace_assign_type(field, iter->ent);
 938
 939	if (!S)
 940		S = task_index_to_char(field->prev_state);
 941	T = task_index_to_char(field->next_state);
 942	trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
 943			 field->prev_pid,
 944			 field->prev_prio,
 945			 S,
 946			 field->next_cpu,
 947			 field->next_pid,
 948			 field->next_prio,
 949			 T);
 950
 951	return trace_handle_return(&iter->seq);
 952}
 953
 954static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
 955				       struct trace_event *event)
 956{
 957	return trace_ctxwake_raw(iter, 0);
 958}
 959
 960static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
 961					struct trace_event *event)
 962{
 963	return trace_ctxwake_raw(iter, '+');
 964}
 965
 966
 967static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
 968{
 969	struct ctx_switch_entry *field;
 970	struct trace_seq *s = &iter->seq;
 971	int T;
 972
 973	trace_assign_type(field, iter->ent);
 974
 975	if (!S)
 976		S = task_index_to_char(field->prev_state);
 977	T = task_index_to_char(field->next_state);
 978
 979	SEQ_PUT_HEX_FIELD(s, field->prev_pid);
 980	SEQ_PUT_HEX_FIELD(s, field->prev_prio);
 981	SEQ_PUT_HEX_FIELD(s, S);
 982	SEQ_PUT_HEX_FIELD(s, field->next_cpu);
 983	SEQ_PUT_HEX_FIELD(s, field->next_pid);
 984	SEQ_PUT_HEX_FIELD(s, field->next_prio);
 985	SEQ_PUT_HEX_FIELD(s, T);
 986
 987	return trace_handle_return(s);
 988}
 989
 990static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
 991				       struct trace_event *event)
 992{
 993	return trace_ctxwake_hex(iter, 0);
 994}
 995
 996static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
 997					struct trace_event *event)
 998{
 999	return trace_ctxwake_hex(iter, '+');
1000}
1001
1002static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1003					   int flags, struct trace_event *event)
1004{
1005	struct ctx_switch_entry *field;
1006	struct trace_seq *s = &iter->seq;
1007
1008	trace_assign_type(field, iter->ent);
1009
1010	SEQ_PUT_FIELD(s, field->prev_pid);
1011	SEQ_PUT_FIELD(s, field->prev_prio);
1012	SEQ_PUT_FIELD(s, field->prev_state);
1013	SEQ_PUT_FIELD(s, field->next_cpu);
1014	SEQ_PUT_FIELD(s, field->next_pid);
1015	SEQ_PUT_FIELD(s, field->next_prio);
1016	SEQ_PUT_FIELD(s, field->next_state);
1017
1018	return trace_handle_return(s);
1019}
1020
1021static struct trace_event_functions trace_ctx_funcs = {
1022	.trace		= trace_ctx_print,
1023	.raw		= trace_ctx_raw,
1024	.hex		= trace_ctx_hex,
1025	.binary		= trace_ctxwake_bin,
1026};
1027
1028static struct trace_event trace_ctx_event = {
1029	.type		= TRACE_CTX,
1030	.funcs		= &trace_ctx_funcs,
1031};
1032
1033static struct trace_event_functions trace_wake_funcs = {
1034	.trace		= trace_wake_print,
1035	.raw		= trace_wake_raw,
1036	.hex		= trace_wake_hex,
1037	.binary		= trace_ctxwake_bin,
1038};
1039
1040static struct trace_event trace_wake_event = {
1041	.type		= TRACE_WAKE,
1042	.funcs		= &trace_wake_funcs,
1043};
1044
1045/* TRACE_STACK */
1046
1047static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1048					   int flags, struct trace_event *event)
1049{
1050	struct stack_entry *field;
1051	struct trace_seq *s = &iter->seq;
1052	unsigned long *p;
1053	unsigned long *end;
 
1054
1055	trace_assign_type(field, iter->ent);
1056	end = (unsigned long *)((long)iter->ent + iter->ent_size);
1057
1058	trace_seq_puts(s, "<stack trace>\n");
1059
1060	for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1061
1062		if (trace_seq_has_overflowed(s))
1063			break;
1064
1065		trace_seq_puts(s, " => ");
1066		seq_print_ip_sym(s, *p, flags);
 
 
 
 
1067		trace_seq_putc(s, '\n');
1068	}
1069
1070	return trace_handle_return(s);
1071}
1072
1073static struct trace_event_functions trace_stack_funcs = {
1074	.trace		= trace_stack_print,
1075};
1076
1077static struct trace_event trace_stack_event = {
1078	.type		= TRACE_STACK,
1079	.funcs		= &trace_stack_funcs,
1080};
1081
1082/* TRACE_USER_STACK */
1083static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1084						int flags, struct trace_event *event)
1085{
1086	struct trace_array *tr = iter->tr;
1087	struct userstack_entry *field;
1088	struct trace_seq *s = &iter->seq;
1089	struct mm_struct *mm = NULL;
1090	unsigned int i;
1091
1092	trace_assign_type(field, iter->ent);
1093
1094	trace_seq_puts(s, "<user stack trace>\n");
1095
1096	if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1097		struct task_struct *task;
1098		/*
1099		 * we do the lookup on the thread group leader,
1100		 * since individual threads might have already quit!
1101		 */
1102		rcu_read_lock();
1103		task = find_task_by_vpid(field->tgid);
1104		if (task)
1105			mm = get_task_mm(task);
1106		rcu_read_unlock();
1107	}
1108
1109	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1110		unsigned long ip = field->caller[i];
1111
1112		if (!ip || trace_seq_has_overflowed(s))
1113			break;
1114
1115		trace_seq_puts(s, " => ");
1116		seq_print_user_ip(s, mm, ip, flags);
1117		trace_seq_putc(s, '\n');
1118	}
1119
1120	if (mm)
1121		mmput(mm);
1122
1123	return trace_handle_return(s);
1124}
1125
1126static struct trace_event_functions trace_user_stack_funcs = {
1127	.trace		= trace_user_stack_print,
1128};
1129
1130static struct trace_event trace_user_stack_event = {
1131	.type		= TRACE_USER_STACK,
1132	.funcs		= &trace_user_stack_funcs,
1133};
1134
1135/* TRACE_HWLAT */
1136static enum print_line_t
1137trace_hwlat_print(struct trace_iterator *iter, int flags,
1138		  struct trace_event *event)
1139{
1140	struct trace_entry *entry = iter->ent;
1141	struct trace_seq *s = &iter->seq;
1142	struct hwlat_entry *field;
1143
1144	trace_assign_type(field, entry);
1145
1146	trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1147			 field->seqnum,
1148			 field->duration,
1149			 field->outer_duration,
1150			 (long long)field->timestamp.tv_sec,
1151			 field->timestamp.tv_nsec);
1152
1153	if (field->nmi_count) {
1154		/*
1155		 * The generic sched_clock() is not NMI safe, thus
1156		 * we only record the count and not the time.
1157		 */
1158		if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1159			trace_seq_printf(s, " nmi-total:%llu",
1160					 field->nmi_total_ts);
1161		trace_seq_printf(s, " nmi-count:%u",
1162				 field->nmi_count);
1163	}
1164
1165	trace_seq_putc(s, '\n');
1166
1167	return trace_handle_return(s);
1168}
1169
1170
1171static enum print_line_t
1172trace_hwlat_raw(struct trace_iterator *iter, int flags,
1173		struct trace_event *event)
1174{
1175	struct hwlat_entry *field;
1176	struct trace_seq *s = &iter->seq;
1177
1178	trace_assign_type(field, iter->ent);
1179
1180	trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1181			 field->duration,
1182			 field->outer_duration,
1183			 (long long)field->timestamp.tv_sec,
1184			 field->timestamp.tv_nsec,
1185			 field->seqnum);
1186
1187	return trace_handle_return(s);
1188}
1189
1190static struct trace_event_functions trace_hwlat_funcs = {
1191	.trace		= trace_hwlat_print,
1192	.raw		= trace_hwlat_raw,
1193};
1194
1195static struct trace_event trace_hwlat_event = {
1196	.type		= TRACE_HWLAT,
1197	.funcs		= &trace_hwlat_funcs,
1198};
1199
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1200/* TRACE_BPUTS */
1201static enum print_line_t
1202trace_bputs_print(struct trace_iterator *iter, int flags,
1203		   struct trace_event *event)
1204{
1205	struct trace_entry *entry = iter->ent;
1206	struct trace_seq *s = &iter->seq;
1207	struct bputs_entry *field;
1208
1209	trace_assign_type(field, entry);
1210
1211	seq_print_ip_sym(s, field->ip, flags);
1212	trace_seq_puts(s, ": ");
1213	trace_seq_puts(s, field->str);
1214
1215	return trace_handle_return(s);
1216}
1217
1218
1219static enum print_line_t
1220trace_bputs_raw(struct trace_iterator *iter, int flags,
1221		struct trace_event *event)
1222{
1223	struct bputs_entry *field;
1224	struct trace_seq *s = &iter->seq;
1225
1226	trace_assign_type(field, iter->ent);
1227
1228	trace_seq_printf(s, ": %lx : ", field->ip);
1229	trace_seq_puts(s, field->str);
1230
1231	return trace_handle_return(s);
1232}
1233
1234static struct trace_event_functions trace_bputs_funcs = {
1235	.trace		= trace_bputs_print,
1236	.raw		= trace_bputs_raw,
1237};
1238
1239static struct trace_event trace_bputs_event = {
1240	.type		= TRACE_BPUTS,
1241	.funcs		= &trace_bputs_funcs,
1242};
1243
1244/* TRACE_BPRINT */
1245static enum print_line_t
1246trace_bprint_print(struct trace_iterator *iter, int flags,
1247		   struct trace_event *event)
1248{
1249	struct trace_entry *entry = iter->ent;
1250	struct trace_seq *s = &iter->seq;
1251	struct bprint_entry *field;
1252
1253	trace_assign_type(field, entry);
1254
1255	seq_print_ip_sym(s, field->ip, flags);
1256	trace_seq_puts(s, ": ");
1257	trace_seq_bprintf(s, field->fmt, field->buf);
1258
1259	return trace_handle_return(s);
1260}
1261
1262
1263static enum print_line_t
1264trace_bprint_raw(struct trace_iterator *iter, int flags,
1265		 struct trace_event *event)
1266{
1267	struct bprint_entry *field;
1268	struct trace_seq *s = &iter->seq;
1269
1270	trace_assign_type(field, iter->ent);
1271
1272	trace_seq_printf(s, ": %lx : ", field->ip);
1273	trace_seq_bprintf(s, field->fmt, field->buf);
1274
1275	return trace_handle_return(s);
1276}
1277
1278static struct trace_event_functions trace_bprint_funcs = {
1279	.trace		= trace_bprint_print,
1280	.raw		= trace_bprint_raw,
1281};
1282
1283static struct trace_event trace_bprint_event = {
1284	.type		= TRACE_BPRINT,
1285	.funcs		= &trace_bprint_funcs,
1286};
1287
1288/* TRACE_PRINT */
1289static enum print_line_t trace_print_print(struct trace_iterator *iter,
1290					   int flags, struct trace_event *event)
1291{
1292	struct print_entry *field;
1293	struct trace_seq *s = &iter->seq;
 
1294
1295	trace_assign_type(field, iter->ent);
1296
1297	seq_print_ip_sym(s, field->ip, flags);
 
 
1298	trace_seq_printf(s, ": %s", field->buf);
1299
1300	return trace_handle_return(s);
1301}
1302
1303static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1304					 struct trace_event *event)
1305{
1306	struct print_entry *field;
1307
1308	trace_assign_type(field, iter->ent);
1309
1310	trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1311
1312	return trace_handle_return(&iter->seq);
1313}
1314
1315static struct trace_event_functions trace_print_funcs = {
1316	.trace		= trace_print_print,
1317	.raw		= trace_print_raw,
1318};
1319
1320static struct trace_event trace_print_event = {
1321	.type	 	= TRACE_PRINT,
1322	.funcs		= &trace_print_funcs,
1323};
1324
1325static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1326					 struct trace_event *event)
1327{
1328	struct raw_data_entry *field;
1329	int i;
1330
1331	trace_assign_type(field, iter->ent);
1332
1333	trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1334
1335	for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1336		trace_seq_printf(&iter->seq, " %02x",
1337				 (unsigned char)field->buf[i]);
1338
1339	trace_seq_putc(&iter->seq, '\n');
1340
1341	return trace_handle_return(&iter->seq);
1342}
1343
1344static struct trace_event_functions trace_raw_data_funcs = {
1345	.trace		= trace_raw_data,
1346	.raw		= trace_raw_data,
1347};
1348
1349static struct trace_event trace_raw_data_event = {
1350	.type	 	= TRACE_RAW_DATA,
1351	.funcs		= &trace_raw_data_funcs,
1352};
1353
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1354
1355static struct trace_event *events[] __initdata = {
1356	&trace_fn_event,
1357	&trace_ctx_event,
1358	&trace_wake_event,
1359	&trace_stack_event,
1360	&trace_user_stack_event,
1361	&trace_bputs_event,
1362	&trace_bprint_event,
1363	&trace_print_event,
1364	&trace_hwlat_event,
 
 
1365	&trace_raw_data_event,
 
1366	NULL
1367};
1368
1369__init static int init_events(void)
1370{
1371	struct trace_event *event;
1372	int i, ret;
1373
1374	for (i = 0; events[i]; i++) {
1375		event = events[i];
1376
1377		ret = register_trace_event(event);
1378		if (!ret) {
1379			printk(KERN_WARNING "event %d failed to register\n",
1380			       event->type);
1381			WARN_ON_ONCE(1);
1382		}
1383	}
1384
1385	return 0;
1386}
1387early_initcall(init_events);
v6.13.7
   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	struct trace_seq *s = &iter->seq;
 321	va_list ap;
 322
 323	if (ignore_event(iter))
 324		return;
 325
 326	va_start(ap, fmt);
 327	trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
 328	va_end(ap);
 329}
 330EXPORT_SYMBOL(trace_event_printf);
 331
 332static __printf(3, 0)
 333int trace_output_raw(struct trace_iterator *iter, char *name,
 334		     char *fmt, va_list ap)
 335{
 336	struct trace_seq *s = &iter->seq;
 337
 338	trace_seq_printf(s, "%s: ", name);
 339	trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
 340
 341	return trace_handle_return(s);
 342}
 343
 344int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
 345{
 346	va_list ap;
 347	int ret;
 348
 349	va_start(ap, fmt);
 350	ret = trace_output_raw(iter, name, fmt, ap);
 351	va_end(ap);
 352
 353	return ret;
 354}
 355EXPORT_SYMBOL_GPL(trace_output_call);
 356
 357static inline const char *kretprobed(const char *name, unsigned long addr)
 
 358{
 359	if (is_kretprobe_trampoline(addr))
 
 
 
 360		return "[unknown/kretprobe'd]";
 361	return name;
 362}
 
 
 
 
 
 
 363
 364void
 365trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
 366{
 367#ifdef CONFIG_KALLSYMS
 368	char str[KSYM_SYMBOL_LEN];
 369	const char *name;
 370
 371	if (offset)
 372		sprint_symbol(str, address);
 373	else
 374		kallsyms_lookup(address, NULL, NULL, NULL, str);
 375	name = kretprobed(str, address);
 376
 377	if (name && strlen(name)) {
 378		trace_seq_puts(s, name);
 379		return;
 380	}
 381#endif
 382	trace_seq_printf(s, "0x%08lx", address);
 383}
 384
 385#ifndef CONFIG_64BIT
 386# define IP_FMT "%08lx"
 387#else
 388# define IP_FMT "%016lx"
 389#endif
 390
 391static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 392			     unsigned long ip, unsigned long sym_flags)
 393{
 394	struct file *file = NULL;
 395	unsigned long vmstart = 0;
 396	int ret = 1;
 397
 398	if (s->full)
 399		return 0;
 400
 401	if (mm) {
 402		const struct vm_area_struct *vma;
 403
 404		mmap_read_lock(mm);
 405		vma = find_vma(mm, ip);
 406		if (vma) {
 407			file = vma->vm_file;
 408			vmstart = vma->vm_start;
 409		}
 410		if (file) {
 411			ret = trace_seq_path(s, file_user_path(file));
 412			if (ret)
 413				trace_seq_printf(s, "[+0x%lx]",
 414						 ip - vmstart);
 415		}
 416		mmap_read_unlock(mm);
 417	}
 418	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 419		trace_seq_printf(s, " <" IP_FMT ">", ip);
 420	return !trace_seq_has_overflowed(s);
 421}
 422
 423int
 424seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
 425{
 426	if (!ip) {
 427		trace_seq_putc(s, '0');
 428		goto out;
 429	}
 430
 431	trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER_SYM_OFFSET);
 432
 433	if (sym_flags & TRACE_ITER_SYM_ADDR)
 434		trace_seq_printf(s, " <" IP_FMT ">", ip);
 435
 436 out:
 437	return !trace_seq_has_overflowed(s);
 438}
 439
 440/**
 441 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
 442 * @s: trace seq struct to write to
 443 * @entry: The trace entry field from the ring buffer
 444 *
 445 * Prints the generic fields of irqs off, in hard or softirq, preempt
 446 * count.
 447 */
 448int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 449{
 450	char hardsoft_irq;
 451	char need_resched;
 452	char irqs_off;
 453	int hardirq;
 454	int softirq;
 455	int bh_off;
 456	int nmi;
 457
 458	nmi = entry->flags & TRACE_FLAG_NMI;
 459	hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
 460	softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 461	bh_off = entry->flags & TRACE_FLAG_BH_OFF;
 462
 463	irqs_off =
 464		(entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
 465		(entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
 466		bh_off ? 'b' :
 467		'.';
 468
 469	switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY |
 470				TRACE_FLAG_PREEMPT_RESCHED)) {
 471	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
 472		need_resched = 'B';
 473		break;
 474	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
 475		need_resched = 'N';
 476		break;
 477	case TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
 478		need_resched = 'L';
 479		break;
 480	case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY:
 481		need_resched = 'b';
 482		break;
 483	case TRACE_FLAG_NEED_RESCHED:
 484		need_resched = 'n';
 485		break;
 486	case TRACE_FLAG_PREEMPT_RESCHED:
 487		need_resched = 'p';
 488		break;
 489	case TRACE_FLAG_NEED_RESCHED_LAZY:
 490		need_resched = 'l';
 491		break;
 492	default:
 493		need_resched = '.';
 494		break;
 495	}
 496
 497	hardsoft_irq =
 498		(nmi && hardirq)     ? 'Z' :
 499		nmi                  ? 'z' :
 500		(hardirq && softirq) ? 'H' :
 501		hardirq              ? 'h' :
 502		softirq              ? 's' :
 503		                       '.' ;
 504
 505	trace_seq_printf(s, "%c%c%c",
 506			 irqs_off, need_resched, hardsoft_irq);
 507
 508	if (entry->preempt_count & 0xf)
 509		trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
 510	else
 511		trace_seq_putc(s, '.');
 512
 513	if (entry->preempt_count & 0xf0)
 514		trace_seq_printf(s, "%x", entry->preempt_count >> 4);
 515	else
 516		trace_seq_putc(s, '.');
 517
 518	return !trace_seq_has_overflowed(s);
 519}
 520
 521static int
 522lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
 523{
 524	char comm[TASK_COMM_LEN];
 525
 526	trace_find_cmdline(entry->pid, comm);
 527
 528	trace_seq_printf(s, "%8.8s-%-7d %3d",
 529			 comm, entry->pid, cpu);
 530
 531	return trace_print_lat_fmt(s, entry);
 532}
 533
 534#undef MARK
 535#define MARK(v, s) {.val = v, .sym = s}
 536/* trace overhead mark */
 537static const struct trace_mark {
 538	unsigned long long	val; /* unit: nsec */
 539	char			sym;
 540} mark[] = {
 541	MARK(1000000000ULL	, '$'), /* 1 sec */
 542	MARK(100000000ULL	, '@'), /* 100 msec */
 543	MARK(10000000ULL	, '*'), /* 10 msec */
 544	MARK(1000000ULL		, '#'), /* 1000 usecs */
 545	MARK(100000ULL		, '!'), /* 100 usecs */
 546	MARK(10000ULL		, '+'), /* 10 usecs */
 547};
 548#undef MARK
 549
 550char trace_find_mark(unsigned long long d)
 551{
 552	int i;
 553	int size = ARRAY_SIZE(mark);
 554
 555	for (i = 0; i < size; i++) {
 556		if (d > mark[i].val)
 557			break;
 558	}
 559
 560	return (i == size) ? ' ' : mark[i].sym;
 561}
 562
 563static int
 564lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
 565{
 566	struct trace_array *tr = iter->tr;
 567	unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
 568	unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
 569	unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
 570	unsigned long long rel_ts = next_ts - iter->ts;
 571	struct trace_seq *s = &iter->seq;
 572
 573	if (in_ns) {
 574		abs_ts = ns2usecs(abs_ts);
 575		rel_ts = ns2usecs(rel_ts);
 576	}
 577
 578	if (verbose && in_ns) {
 579		unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
 580		unsigned long abs_msec = (unsigned long)abs_ts;
 581		unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
 582		unsigned long rel_msec = (unsigned long)rel_ts;
 583
 584		trace_seq_printf(
 585			s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
 586			ns2usecs(iter->ts),
 587			abs_msec, abs_usec,
 588			rel_msec, rel_usec);
 589
 590	} else if (verbose && !in_ns) {
 591		trace_seq_printf(
 592			s, "[%016llx] %lld (+%lld): ",
 593			iter->ts, abs_ts, rel_ts);
 594
 595	} else if (!verbose && in_ns) {
 596		trace_seq_printf(
 597			s, " %4lldus%c: ",
 598			abs_ts,
 599			trace_find_mark(rel_ts * NSEC_PER_USEC));
 600
 601	} else { /* !verbose && !in_ns */
 602		trace_seq_printf(s, " %4lld: ", abs_ts);
 603	}
 604
 605	return !trace_seq_has_overflowed(s);
 606}
 607
 608static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
 609			     unsigned long long ts)
 610{
 611	unsigned long secs, usec_rem;
 612	unsigned long long t;
 613
 614	if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
 615		t = ns2usecs(ts);
 616		usec_rem = do_div(t, USEC_PER_SEC);
 617		secs = (unsigned long)t;
 618		trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
 619	} else
 620		trace_seq_printf(s, " %12llu", ts);
 621}
 622
 623int trace_print_context(struct trace_iterator *iter)
 624{
 625	struct trace_array *tr = iter->tr;
 626	struct trace_seq *s = &iter->seq;
 627	struct trace_entry *entry = iter->ent;
 
 
 628	char comm[TASK_COMM_LEN];
 629
 630	trace_find_cmdline(entry->pid, comm);
 631
 632	trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
 633
 634	if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
 635		unsigned int tgid = trace_find_tgid(entry->pid);
 636
 637		if (!tgid)
 638			trace_seq_printf(s, "(-------) ");
 639		else
 640			trace_seq_printf(s, "(%7d) ", tgid);
 641	}
 642
 643	trace_seq_printf(s, "[%03d] ", iter->cpu);
 644
 645	if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
 646		trace_print_lat_fmt(s, entry);
 647
 648	trace_print_time(s, iter, iter->ts);
 649	trace_seq_puts(s, ": ");
 
 
 
 
 
 650
 651	return !trace_seq_has_overflowed(s);
 652}
 653
 654int trace_print_lat_context(struct trace_iterator *iter)
 655{
 656	struct trace_entry *entry, *next_entry;
 657	struct trace_array *tr = iter->tr;
 
 
 658	struct trace_seq *s = &iter->seq;
 
 
 
 
 659	unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
 660	u64 next_ts;
 661
 662	next_entry = trace_find_next_entry(iter, NULL, &next_ts);
 
 
 663	if (!next_entry)
 664		next_ts = iter->ts;
 665
 666	/* trace_find_next_entry() may change iter->ent */
 667	entry = iter->ent;
 668
 669	if (verbose) {
 670		char comm[TASK_COMM_LEN];
 671
 672		trace_find_cmdline(entry->pid, comm);
 673
 674		trace_seq_printf(
 675			s, "%16s %7d %3d %d %08x %08lx ",
 676			comm, entry->pid, iter->cpu, entry->flags,
 677			entry->preempt_count & 0xf, iter->idx);
 678	} else {
 679		lat_print_generic(s, entry, iter->cpu);
 680	}
 681
 682	lat_print_timestamp(iter, next_ts);
 683
 684	return !trace_seq_has_overflowed(s);
 685}
 686
 687/**
 688 * ftrace_find_event - find a registered event
 689 * @type: the type of event to look for
 690 *
 691 * Returns an event of type @type otherwise NULL
 692 * Called with trace_event_read_lock() held.
 693 */
 694struct trace_event *ftrace_find_event(int type)
 695{
 696	struct trace_event *event;
 697	unsigned key;
 698
 699	key = type & (EVENT_HASHSIZE - 1);
 700
 701	hlist_for_each_entry(event, &event_hash[key], node) {
 702		if (event->type == type)
 703			return event;
 704	}
 705
 706	return NULL;
 707}
 708
 709static DEFINE_IDA(trace_event_ida);
 710
 711static void free_trace_event_type(int type)
 712{
 713	if (type >= __TRACE_LAST_TYPE)
 714		ida_free(&trace_event_ida, type);
 715}
 
 
 
 
 716
 717static int alloc_trace_event_type(void)
 718{
 719	int next;
 
 
 
 
 
 
 720
 721	/* Skip static defined type numbers */
 722	next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
 723			       TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
 724	if (next < 0)
 725		return 0;
 726	return next;
 
 
 727}
 728
 729void trace_event_read_lock(void)
 730{
 731	down_read(&trace_event_sem);
 732}
 733
 734void trace_event_read_unlock(void)
 735{
 736	up_read(&trace_event_sem);
 737}
 738
 739/**
 740 * register_trace_event - register output for an event type
 741 * @event: the event type to register
 742 *
 743 * Event types are stored in a hash and this hash is used to
 744 * find a way to print an event. If the @event->type is set
 745 * then it will use that type, otherwise it will assign a
 746 * type to use.
 747 *
 748 * If you assign your own type, please make sure it is added
 749 * to the trace_type enum in trace.h, to avoid collisions
 750 * with the dynamic types.
 751 *
 752 * Returns the event type number or zero on error.
 753 */
 754int register_trace_event(struct trace_event *event)
 755{
 756	unsigned key;
 757	int ret = 0;
 758
 759	down_write(&trace_event_sem);
 760
 761	if (WARN_ON(!event))
 762		goto out;
 763
 764	if (WARN_ON(!event->funcs))
 765		goto out;
 766
 
 
 767	if (!event->type) {
 768		event->type = alloc_trace_event_type();
 769		if (!event->type)
 
 
 
 
 
 
 
 
 
 
 
 
 
 770			goto out;
 771	} else if (WARN(event->type > __TRACE_LAST_TYPE,
 772			"Need to add type to trace.h")) {
 
 
 
 
 773		goto out;
 774	} else {
 775		/* Is this event already used */
 776		if (ftrace_find_event(event->type))
 777			goto out;
 778	}
 779
 780	if (event->funcs->trace == NULL)
 781		event->funcs->trace = trace_nop_print;
 782	if (event->funcs->raw == NULL)
 783		event->funcs->raw = trace_nop_print;
 784	if (event->funcs->hex == NULL)
 785		event->funcs->hex = trace_nop_print;
 786	if (event->funcs->binary == NULL)
 787		event->funcs->binary = trace_nop_print;
 788
 789	key = event->type & (EVENT_HASHSIZE - 1);
 790
 791	hlist_add_head(&event->node, &event_hash[key]);
 792
 793	ret = event->type;
 794 out:
 795	up_write(&trace_event_sem);
 796
 797	return ret;
 798}
 799EXPORT_SYMBOL_GPL(register_trace_event);
 800
 801/*
 802 * Used by module code with the trace_event_sem held for write.
 803 */
 804int __unregister_trace_event(struct trace_event *event)
 805{
 806	hlist_del(&event->node);
 807	free_trace_event_type(event->type);
 808	return 0;
 809}
 810
 811/**
 812 * unregister_trace_event - remove a no longer used event
 813 * @event: the event to remove
 814 */
 815int unregister_trace_event(struct trace_event *event)
 816{
 817	down_write(&trace_event_sem);
 818	__unregister_trace_event(event);
 819	up_write(&trace_event_sem);
 820
 821	return 0;
 822}
 823EXPORT_SYMBOL_GPL(unregister_trace_event);
 824
 825/*
 826 * Standard events
 827 */
 828
 829static void print_array(struct trace_iterator *iter, void *pos,
 830			struct ftrace_event_field *field)
 831{
 832	int offset;
 833	int len;
 834	int i;
 835
 836	offset = *(int *)pos & 0xffff;
 837	len = *(int *)pos >> 16;
 838
 839	if (field)
 840		offset += field->offset + sizeof(int);
 841
 842	if (offset + len > iter->ent_size) {
 843		trace_seq_puts(&iter->seq, "<OVERFLOW>");
 844		return;
 845	}
 846
 847	pos = (void *)iter->ent + offset;
 848
 849	for (i = 0; i < len; i++, pos++) {
 850		if (i)
 851			trace_seq_putc(&iter->seq, ',');
 852		trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
 853	}
 854}
 855
 856static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
 857			 struct list_head *head)
 858{
 859	struct ftrace_event_field *field;
 860	int offset;
 861	int len;
 862	int ret;
 863	void *pos;
 864
 865	list_for_each_entry_reverse(field, head, link) {
 866		trace_seq_printf(&iter->seq, " %s=", field->name);
 867		if (field->offset + field->size > iter->ent_size) {
 868			trace_seq_puts(&iter->seq, "<OVERFLOW>");
 869			continue;
 870		}
 871		pos = (void *)iter->ent + field->offset;
 872
 873		switch (field->filter_type) {
 874		case FILTER_COMM:
 875		case FILTER_STATIC_STRING:
 876			trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
 877			break;
 878		case FILTER_RDYN_STRING:
 879		case FILTER_DYN_STRING:
 880			offset = *(int *)pos & 0xffff;
 881			len = *(int *)pos >> 16;
 882
 883			if (field->filter_type == FILTER_RDYN_STRING)
 884				offset += field->offset + sizeof(int);
 885
 886			if (offset + len > iter->ent_size) {
 887				trace_seq_puts(&iter->seq, "<OVERFLOW>");
 888				break;
 889			}
 890			pos = (void *)iter->ent + offset;
 891			trace_seq_printf(&iter->seq, "%.*s", len, (char *)pos);
 892			break;
 893		case FILTER_PTR_STRING:
 894			if (!iter->fmt_size)
 895				trace_iter_expand_format(iter);
 896			pos = *(void **)pos;
 897			ret = strncpy_from_kernel_nofault(iter->fmt, pos,
 898							  iter->fmt_size);
 899			if (ret < 0)
 900				trace_seq_printf(&iter->seq, "(0x%px)", pos);
 901			else
 902				trace_seq_printf(&iter->seq, "(0x%px:%s)",
 903						 pos, iter->fmt);
 904			break;
 905		case FILTER_TRACE_FN:
 906			pos = *(void **)pos;
 907			trace_seq_printf(&iter->seq, "%pS", pos);
 908			break;
 909		case FILTER_CPU:
 910		case FILTER_OTHER:
 911			switch (field->size) {
 912			case 1:
 913				if (isprint(*(char *)pos)) {
 914					trace_seq_printf(&iter->seq, "'%c'",
 915						 *(unsigned char *)pos);
 916				}
 917				trace_seq_printf(&iter->seq, "(%d)",
 918						 *(unsigned char *)pos);
 919				break;
 920			case 2:
 921				trace_seq_printf(&iter->seq, "0x%x (%d)",
 922						 *(unsigned short *)pos,
 923						 *(unsigned short *)pos);
 924				break;
 925			case 4:
 926				/* dynamic array info is 4 bytes */
 927				if (strstr(field->type, "__data_loc")) {
 928					print_array(iter, pos, NULL);
 929					break;
 930				}
 931
 932				if (strstr(field->type, "__rel_loc")) {
 933					print_array(iter, pos, field);
 934					break;
 935				}
 936
 937				trace_seq_printf(&iter->seq, "0x%x (%d)",
 938						 *(unsigned int *)pos,
 939						 *(unsigned int *)pos);
 940				break;
 941			case 8:
 942				trace_seq_printf(&iter->seq, "0x%llx (%lld)",
 943						 *(unsigned long long *)pos,
 944						 *(unsigned long long *)pos);
 945				break;
 946			default:
 947				trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
 948				break;
 949			}
 950			break;
 951		default:
 952			trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
 953		}
 954	}
 955	trace_seq_putc(&iter->seq, '\n');
 956}
 957
 958enum print_line_t print_event_fields(struct trace_iterator *iter,
 959				     struct trace_event *event)
 960{
 961	struct trace_event_call *call;
 962	struct list_head *head;
 963
 964	/* ftrace defined events have separate call structures */
 965	if (event->type <= __TRACE_LAST_TYPE) {
 966		bool found = false;
 967
 968		down_read(&trace_event_sem);
 969		list_for_each_entry(call, &ftrace_events, list) {
 970			if (call->event.type == event->type) {
 971				found = true;
 972				break;
 973			}
 974			/* No need to search all events */
 975			if (call->event.type > __TRACE_LAST_TYPE)
 976				break;
 977		}
 978		up_read(&trace_event_sem);
 979		if (!found) {
 980			trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
 981			goto out;
 982		}
 983	} else {
 984		call = container_of(event, struct trace_event_call, event);
 985	}
 986	head = trace_get_fields(call);
 987
 988	trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
 989
 990	if (head && !list_empty(head))
 991		print_fields(iter, call, head);
 992	else
 993		trace_seq_puts(&iter->seq, "No fields found\n");
 994
 995 out:
 996	return trace_handle_return(&iter->seq);
 997}
 998
 999enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
1000				  struct trace_event *event)
1001{
1002	trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
1003
1004	return trace_handle_return(&iter->seq);
1005}
1006
1007static void print_fn_trace(struct trace_seq *s, unsigned long ip,
1008			   unsigned long parent_ip, long delta, int flags)
1009{
1010	ip += delta;
1011	parent_ip += delta;
1012
1013	seq_print_ip_sym(s, ip, flags);
1014
1015	if ((flags & TRACE_ITER_PRINT_PARENT) && parent_ip) {
1016		trace_seq_puts(s, " <-");
1017		seq_print_ip_sym(s, parent_ip, flags);
1018	}
1019}
1020
1021/* TRACE_FN */
1022static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1023					struct trace_event *event)
1024{
1025	struct ftrace_entry *field;
1026	struct trace_seq *s = &iter->seq;
1027
1028	trace_assign_type(field, iter->ent);
1029
1030	print_fn_trace(s, field->ip, field->parent_ip, iter->tr->text_delta, flags);
 
 
 
 
 
 
1031	trace_seq_putc(s, '\n');
1032
1033	return trace_handle_return(s);
1034}
1035
1036static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1037				      struct trace_event *event)
1038{
1039	struct ftrace_entry *field;
1040
1041	trace_assign_type(field, iter->ent);
1042
1043	trace_seq_printf(&iter->seq, "%lx %lx\n",
1044			 field->ip,
1045			 field->parent_ip);
1046
1047	return trace_handle_return(&iter->seq);
1048}
1049
1050static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1051				      struct trace_event *event)
1052{
1053	struct ftrace_entry *field;
1054	struct trace_seq *s = &iter->seq;
1055
1056	trace_assign_type(field, iter->ent);
1057
1058	SEQ_PUT_HEX_FIELD(s, field->ip);
1059	SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1060
1061	return trace_handle_return(s);
1062}
1063
1064static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1065				      struct trace_event *event)
1066{
1067	struct ftrace_entry *field;
1068	struct trace_seq *s = &iter->seq;
1069
1070	trace_assign_type(field, iter->ent);
1071
1072	SEQ_PUT_FIELD(s, field->ip);
1073	SEQ_PUT_FIELD(s, field->parent_ip);
1074
1075	return trace_handle_return(s);
1076}
1077
1078static struct trace_event_functions trace_fn_funcs = {
1079	.trace		= trace_fn_trace,
1080	.raw		= trace_fn_raw,
1081	.hex		= trace_fn_hex,
1082	.binary		= trace_fn_bin,
1083};
1084
1085static struct trace_event trace_fn_event = {
1086	.type		= TRACE_FN,
1087	.funcs		= &trace_fn_funcs,
1088};
1089
1090/* TRACE_CTX an TRACE_WAKE */
1091static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1092					     char *delim)
1093{
1094	struct ctx_switch_entry *field;
1095	char comm[TASK_COMM_LEN];
1096	int S, T;
1097
1098
1099	trace_assign_type(field, iter->ent);
1100
1101	T = task_index_to_char(field->next_state);
1102	S = task_index_to_char(field->prev_state);
1103	trace_find_cmdline(field->next_pid, comm);
1104	trace_seq_printf(&iter->seq,
1105			 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1106			 field->prev_pid,
1107			 field->prev_prio,
1108			 S, delim,
1109			 field->next_cpu,
1110			 field->next_pid,
1111			 field->next_prio,
1112			 T, comm);
1113
1114	return trace_handle_return(&iter->seq);
1115}
1116
1117static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1118					 struct trace_event *event)
1119{
1120	return trace_ctxwake_print(iter, "==>");
1121}
1122
1123static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1124					  int flags, struct trace_event *event)
1125{
1126	return trace_ctxwake_print(iter, "  +");
1127}
1128
1129static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1130{
1131	struct ctx_switch_entry *field;
1132	int T;
1133
1134	trace_assign_type(field, iter->ent);
1135
1136	if (!S)
1137		S = task_index_to_char(field->prev_state);
1138	T = task_index_to_char(field->next_state);
1139	trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1140			 field->prev_pid,
1141			 field->prev_prio,
1142			 S,
1143			 field->next_cpu,
1144			 field->next_pid,
1145			 field->next_prio,
1146			 T);
1147
1148	return trace_handle_return(&iter->seq);
1149}
1150
1151static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1152				       struct trace_event *event)
1153{
1154	return trace_ctxwake_raw(iter, 0);
1155}
1156
1157static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1158					struct trace_event *event)
1159{
1160	return trace_ctxwake_raw(iter, '+');
1161}
1162
1163
1164static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1165{
1166	struct ctx_switch_entry *field;
1167	struct trace_seq *s = &iter->seq;
1168	int T;
1169
1170	trace_assign_type(field, iter->ent);
1171
1172	if (!S)
1173		S = task_index_to_char(field->prev_state);
1174	T = task_index_to_char(field->next_state);
1175
1176	SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1177	SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1178	SEQ_PUT_HEX_FIELD(s, S);
1179	SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1180	SEQ_PUT_HEX_FIELD(s, field->next_pid);
1181	SEQ_PUT_HEX_FIELD(s, field->next_prio);
1182	SEQ_PUT_HEX_FIELD(s, T);
1183
1184	return trace_handle_return(s);
1185}
1186
1187static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1188				       struct trace_event *event)
1189{
1190	return trace_ctxwake_hex(iter, 0);
1191}
1192
1193static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1194					struct trace_event *event)
1195{
1196	return trace_ctxwake_hex(iter, '+');
1197}
1198
1199static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1200					   int flags, struct trace_event *event)
1201{
1202	struct ctx_switch_entry *field;
1203	struct trace_seq *s = &iter->seq;
1204
1205	trace_assign_type(field, iter->ent);
1206
1207	SEQ_PUT_FIELD(s, field->prev_pid);
1208	SEQ_PUT_FIELD(s, field->prev_prio);
1209	SEQ_PUT_FIELD(s, field->prev_state);
1210	SEQ_PUT_FIELD(s, field->next_cpu);
1211	SEQ_PUT_FIELD(s, field->next_pid);
1212	SEQ_PUT_FIELD(s, field->next_prio);
1213	SEQ_PUT_FIELD(s, field->next_state);
1214
1215	return trace_handle_return(s);
1216}
1217
1218static struct trace_event_functions trace_ctx_funcs = {
1219	.trace		= trace_ctx_print,
1220	.raw		= trace_ctx_raw,
1221	.hex		= trace_ctx_hex,
1222	.binary		= trace_ctxwake_bin,
1223};
1224
1225static struct trace_event trace_ctx_event = {
1226	.type		= TRACE_CTX,
1227	.funcs		= &trace_ctx_funcs,
1228};
1229
1230static struct trace_event_functions trace_wake_funcs = {
1231	.trace		= trace_wake_print,
1232	.raw		= trace_wake_raw,
1233	.hex		= trace_wake_hex,
1234	.binary		= trace_ctxwake_bin,
1235};
1236
1237static struct trace_event trace_wake_event = {
1238	.type		= TRACE_WAKE,
1239	.funcs		= &trace_wake_funcs,
1240};
1241
1242/* TRACE_STACK */
1243
1244static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1245					   int flags, struct trace_event *event)
1246{
1247	struct stack_entry *field;
1248	struct trace_seq *s = &iter->seq;
1249	unsigned long *p;
1250	unsigned long *end;
1251	long delta = iter->tr->text_delta;
1252
1253	trace_assign_type(field, iter->ent);
1254	end = (unsigned long *)((long)iter->ent + iter->ent_size);
1255
1256	trace_seq_puts(s, "<stack trace>\n");
1257
1258	for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1259
1260		if (trace_seq_has_overflowed(s))
1261			break;
1262
1263		trace_seq_puts(s, " => ");
1264		if ((*p) == FTRACE_TRAMPOLINE_MARKER) {
1265			trace_seq_puts(s, "[FTRACE TRAMPOLINE]\n");
1266			continue;
1267		}
1268		seq_print_ip_sym(s, (*p) + delta, flags);
1269		trace_seq_putc(s, '\n');
1270	}
1271
1272	return trace_handle_return(s);
1273}
1274
1275static struct trace_event_functions trace_stack_funcs = {
1276	.trace		= trace_stack_print,
1277};
1278
1279static struct trace_event trace_stack_event = {
1280	.type		= TRACE_STACK,
1281	.funcs		= &trace_stack_funcs,
1282};
1283
1284/* TRACE_USER_STACK */
1285static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1286						int flags, struct trace_event *event)
1287{
1288	struct trace_array *tr = iter->tr;
1289	struct userstack_entry *field;
1290	struct trace_seq *s = &iter->seq;
1291	struct mm_struct *mm = NULL;
1292	unsigned int i;
1293
1294	trace_assign_type(field, iter->ent);
1295
1296	trace_seq_puts(s, "<user stack trace>\n");
1297
1298	if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1299		struct task_struct *task;
1300		/*
1301		 * we do the lookup on the thread group leader,
1302		 * since individual threads might have already quit!
1303		 */
1304		rcu_read_lock();
1305		task = find_task_by_vpid(field->tgid);
1306		if (task)
1307			mm = get_task_mm(task);
1308		rcu_read_unlock();
1309	}
1310
1311	for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1312		unsigned long ip = field->caller[i];
1313
1314		if (!ip || trace_seq_has_overflowed(s))
1315			break;
1316
1317		trace_seq_puts(s, " => ");
1318		seq_print_user_ip(s, mm, ip, flags);
1319		trace_seq_putc(s, '\n');
1320	}
1321
1322	if (mm)
1323		mmput(mm);
1324
1325	return trace_handle_return(s);
1326}
1327
1328static struct trace_event_functions trace_user_stack_funcs = {
1329	.trace		= trace_user_stack_print,
1330};
1331
1332static struct trace_event trace_user_stack_event = {
1333	.type		= TRACE_USER_STACK,
1334	.funcs		= &trace_user_stack_funcs,
1335};
1336
1337/* TRACE_HWLAT */
1338static enum print_line_t
1339trace_hwlat_print(struct trace_iterator *iter, int flags,
1340		  struct trace_event *event)
1341{
1342	struct trace_entry *entry = iter->ent;
1343	struct trace_seq *s = &iter->seq;
1344	struct hwlat_entry *field;
1345
1346	trace_assign_type(field, entry);
1347
1348	trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld count:%d",
1349			 field->seqnum,
1350			 field->duration,
1351			 field->outer_duration,
1352			 (long long)field->timestamp.tv_sec,
1353			 field->timestamp.tv_nsec, field->count);
1354
1355	if (field->nmi_count) {
1356		/*
1357		 * The generic sched_clock() is not NMI safe, thus
1358		 * we only record the count and not the time.
1359		 */
1360		if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1361			trace_seq_printf(s, " nmi-total:%llu",
1362					 field->nmi_total_ts);
1363		trace_seq_printf(s, " nmi-count:%u",
1364				 field->nmi_count);
1365	}
1366
1367	trace_seq_putc(s, '\n');
1368
1369	return trace_handle_return(s);
1370}
1371
 
1372static enum print_line_t
1373trace_hwlat_raw(struct trace_iterator *iter, int flags,
1374		struct trace_event *event)
1375{
1376	struct hwlat_entry *field;
1377	struct trace_seq *s = &iter->seq;
1378
1379	trace_assign_type(field, iter->ent);
1380
1381	trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1382			 field->duration,
1383			 field->outer_duration,
1384			 (long long)field->timestamp.tv_sec,
1385			 field->timestamp.tv_nsec,
1386			 field->seqnum);
1387
1388	return trace_handle_return(s);
1389}
1390
1391static struct trace_event_functions trace_hwlat_funcs = {
1392	.trace		= trace_hwlat_print,
1393	.raw		= trace_hwlat_raw,
1394};
1395
1396static struct trace_event trace_hwlat_event = {
1397	.type		= TRACE_HWLAT,
1398	.funcs		= &trace_hwlat_funcs,
1399};
1400
1401/* TRACE_OSNOISE */
1402static enum print_line_t
1403trace_osnoise_print(struct trace_iterator *iter, int flags,
1404		    struct trace_event *event)
1405{
1406	struct trace_entry *entry = iter->ent;
1407	struct trace_seq *s = &iter->seq;
1408	struct osnoise_entry *field;
1409	u64 ratio, ratio_dec;
1410	u64 net_runtime;
1411
1412	trace_assign_type(field, entry);
1413
1414	/*
1415	 * compute the available % of cpu time.
1416	 */
1417	net_runtime = field->runtime - field->noise;
1418	ratio = net_runtime * 10000000;
1419	do_div(ratio, field->runtime);
1420	ratio_dec = do_div(ratio, 100000);
1421
1422	trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1423			 field->runtime,
1424			 field->noise,
1425			 ratio, ratio_dec,
1426			 field->max_sample);
1427
1428	trace_seq_printf(s, " %6u", field->hw_count);
1429	trace_seq_printf(s, " %6u", field->nmi_count);
1430	trace_seq_printf(s, " %6u", field->irq_count);
1431	trace_seq_printf(s, " %6u", field->softirq_count);
1432	trace_seq_printf(s, " %6u", field->thread_count);
1433
1434	trace_seq_putc(s, '\n');
1435
1436	return trace_handle_return(s);
1437}
1438
1439static enum print_line_t
1440trace_osnoise_raw(struct trace_iterator *iter, int flags,
1441		  struct trace_event *event)
1442{
1443	struct osnoise_entry *field;
1444	struct trace_seq *s = &iter->seq;
1445
1446	trace_assign_type(field, iter->ent);
1447
1448	trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1449			 field->runtime,
1450			 field->noise,
1451			 field->max_sample,
1452			 field->hw_count,
1453			 field->nmi_count,
1454			 field->irq_count,
1455			 field->softirq_count,
1456			 field->thread_count);
1457
1458	return trace_handle_return(s);
1459}
1460
1461static struct trace_event_functions trace_osnoise_funcs = {
1462	.trace		= trace_osnoise_print,
1463	.raw		= trace_osnoise_raw,
1464};
1465
1466static struct trace_event trace_osnoise_event = {
1467	.type		= TRACE_OSNOISE,
1468	.funcs		= &trace_osnoise_funcs,
1469};
1470
1471/* TRACE_TIMERLAT */
1472
1473static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1474static enum print_line_t
1475trace_timerlat_print(struct trace_iterator *iter, int flags,
1476		     struct trace_event *event)
1477{
1478	struct trace_entry *entry = iter->ent;
1479	struct trace_seq *s = &iter->seq;
1480	struct timerlat_entry *field;
1481
1482	trace_assign_type(field, entry);
1483
1484	trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1485			 field->seqnum,
1486			 timerlat_lat_context[field->context],
1487			 field->timer_latency);
1488
1489	return trace_handle_return(s);
1490}
1491
1492static enum print_line_t
1493trace_timerlat_raw(struct trace_iterator *iter, int flags,
1494		   struct trace_event *event)
1495{
1496	struct timerlat_entry *field;
1497	struct trace_seq *s = &iter->seq;
1498
1499	trace_assign_type(field, iter->ent);
1500
1501	trace_seq_printf(s, "%u %d %llu\n",
1502			 field->seqnum,
1503			 field->context,
1504			 field->timer_latency);
1505
1506	return trace_handle_return(s);
1507}
1508
1509static struct trace_event_functions trace_timerlat_funcs = {
1510	.trace		= trace_timerlat_print,
1511	.raw		= trace_timerlat_raw,
1512};
1513
1514static struct trace_event trace_timerlat_event = {
1515	.type		= TRACE_TIMERLAT,
1516	.funcs		= &trace_timerlat_funcs,
1517};
1518
1519/* TRACE_BPUTS */
1520static enum print_line_t
1521trace_bputs_print(struct trace_iterator *iter, int flags,
1522		   struct trace_event *event)
1523{
1524	struct trace_entry *entry = iter->ent;
1525	struct trace_seq *s = &iter->seq;
1526	struct bputs_entry *field;
1527
1528	trace_assign_type(field, entry);
1529
1530	seq_print_ip_sym(s, field->ip, flags);
1531	trace_seq_puts(s, ": ");
1532	trace_seq_puts(s, field->str);
1533
1534	return trace_handle_return(s);
1535}
1536
1537
1538static enum print_line_t
1539trace_bputs_raw(struct trace_iterator *iter, int flags,
1540		struct trace_event *event)
1541{
1542	struct bputs_entry *field;
1543	struct trace_seq *s = &iter->seq;
1544
1545	trace_assign_type(field, iter->ent);
1546
1547	trace_seq_printf(s, ": %lx : ", field->ip);
1548	trace_seq_puts(s, field->str);
1549
1550	return trace_handle_return(s);
1551}
1552
1553static struct trace_event_functions trace_bputs_funcs = {
1554	.trace		= trace_bputs_print,
1555	.raw		= trace_bputs_raw,
1556};
1557
1558static struct trace_event trace_bputs_event = {
1559	.type		= TRACE_BPUTS,
1560	.funcs		= &trace_bputs_funcs,
1561};
1562
1563/* TRACE_BPRINT */
1564static enum print_line_t
1565trace_bprint_print(struct trace_iterator *iter, int flags,
1566		   struct trace_event *event)
1567{
1568	struct trace_entry *entry = iter->ent;
1569	struct trace_seq *s = &iter->seq;
1570	struct bprint_entry *field;
1571
1572	trace_assign_type(field, entry);
1573
1574	seq_print_ip_sym(s, field->ip, flags);
1575	trace_seq_puts(s, ": ");
1576	trace_seq_bprintf(s, field->fmt, field->buf);
1577
1578	return trace_handle_return(s);
1579}
1580
1581
1582static enum print_line_t
1583trace_bprint_raw(struct trace_iterator *iter, int flags,
1584		 struct trace_event *event)
1585{
1586	struct bprint_entry *field;
1587	struct trace_seq *s = &iter->seq;
1588
1589	trace_assign_type(field, iter->ent);
1590
1591	trace_seq_printf(s, ": %lx : ", field->ip);
1592	trace_seq_bprintf(s, field->fmt, field->buf);
1593
1594	return trace_handle_return(s);
1595}
1596
1597static struct trace_event_functions trace_bprint_funcs = {
1598	.trace		= trace_bprint_print,
1599	.raw		= trace_bprint_raw,
1600};
1601
1602static struct trace_event trace_bprint_event = {
1603	.type		= TRACE_BPRINT,
1604	.funcs		= &trace_bprint_funcs,
1605};
1606
1607/* TRACE_PRINT */
1608static enum print_line_t trace_print_print(struct trace_iterator *iter,
1609					   int flags, struct trace_event *event)
1610{
1611	struct print_entry *field;
1612	struct trace_seq *s = &iter->seq;
1613	unsigned long ip;
1614
1615	trace_assign_type(field, iter->ent);
1616
1617	ip = field->ip + iter->tr->text_delta;
1618
1619	seq_print_ip_sym(s, ip, flags);
1620	trace_seq_printf(s, ": %s", field->buf);
1621
1622	return trace_handle_return(s);
1623}
1624
1625static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1626					 struct trace_event *event)
1627{
1628	struct print_entry *field;
1629
1630	trace_assign_type(field, iter->ent);
1631
1632	trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1633
1634	return trace_handle_return(&iter->seq);
1635}
1636
1637static struct trace_event_functions trace_print_funcs = {
1638	.trace		= trace_print_print,
1639	.raw		= trace_print_raw,
1640};
1641
1642static struct trace_event trace_print_event = {
1643	.type	 	= TRACE_PRINT,
1644	.funcs		= &trace_print_funcs,
1645};
1646
1647static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1648					 struct trace_event *event)
1649{
1650	struct raw_data_entry *field;
1651	int i;
1652
1653	trace_assign_type(field, iter->ent);
1654
1655	trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1656
1657	for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1658		trace_seq_printf(&iter->seq, " %02x",
1659				 (unsigned char)field->buf[i]);
1660
1661	trace_seq_putc(&iter->seq, '\n');
1662
1663	return trace_handle_return(&iter->seq);
1664}
1665
1666static struct trace_event_functions trace_raw_data_funcs = {
1667	.trace		= trace_raw_data,
1668	.raw		= trace_raw_data,
1669};
1670
1671static struct trace_event trace_raw_data_event = {
1672	.type	 	= TRACE_RAW_DATA,
1673	.funcs		= &trace_raw_data_funcs,
1674};
1675
1676static enum print_line_t
1677trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1678			 struct trace_event *event)
1679{
1680	struct func_repeats_entry *field;
1681	struct trace_seq *s = &iter->seq;
1682
1683	trace_assign_type(field, iter->ent);
1684
1685	trace_seq_printf(s, "%lu %lu %u %llu\n",
1686			 field->ip,
1687			 field->parent_ip,
1688			 field->count,
1689			 FUNC_REPEATS_GET_DELTA_TS(field));
1690
1691	return trace_handle_return(s);
1692}
1693
1694static enum print_line_t
1695trace_func_repeats_print(struct trace_iterator *iter, int flags,
1696			 struct trace_event *event)
1697{
1698	struct func_repeats_entry *field;
1699	struct trace_seq *s = &iter->seq;
1700
1701	trace_assign_type(field, iter->ent);
1702
1703	print_fn_trace(s, field->ip, field->parent_ip, iter->tr->text_delta, flags);
1704	trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1705	trace_print_time(s, iter,
1706			 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1707	trace_seq_puts(s, ")\n");
1708
1709	return trace_handle_return(s);
1710}
1711
1712static struct trace_event_functions trace_func_repeats_funcs = {
1713	.trace		= trace_func_repeats_print,
1714	.raw		= trace_func_repeats_raw,
1715};
1716
1717static struct trace_event trace_func_repeats_event = {
1718	.type	 	= TRACE_FUNC_REPEATS,
1719	.funcs		= &trace_func_repeats_funcs,
1720};
1721
1722static struct trace_event *events[] __initdata = {
1723	&trace_fn_event,
1724	&trace_ctx_event,
1725	&trace_wake_event,
1726	&trace_stack_event,
1727	&trace_user_stack_event,
1728	&trace_bputs_event,
1729	&trace_bprint_event,
1730	&trace_print_event,
1731	&trace_hwlat_event,
1732	&trace_osnoise_event,
1733	&trace_timerlat_event,
1734	&trace_raw_data_event,
1735	&trace_func_repeats_event,
1736	NULL
1737};
1738
1739__init int init_events(void)
1740{
1741	struct trace_event *event;
1742	int i, ret;
1743
1744	for (i = 0; events[i]; i++) {
1745		event = events[i];
 
1746		ret = register_trace_event(event);
1747		WARN_ONCE(!ret, "event %d failed to register", event->type);
 
 
 
 
1748	}
1749
1750	return 0;
1751}