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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * trace_output.c
4 *
5 * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <[email protected]>
6 *
7 */
8#include "trace.h"
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/ftrace.h>
12#include <linux/kprobes.h>
13#include <linux/sched/clock.h>
14#include <linux/sched/mm.h>
15#include <linux/idr.h>
16#include <linux/btf.h>
17#include <linux/bpf.h>
18#include <linux/hashtable.h>
19
20#include "trace_output.h"
21#include "trace_btf.h"
22
23/* 2^7 = 128 */
24#define EVENT_HASH_BITS 7
25
26DECLARE_RWSEM(trace_event_sem);
27
28static DEFINE_HASHTABLE(event_hash, EVENT_HASH_BITS);
29
30enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
31{
32 struct trace_seq *s = &iter->seq;
33 struct trace_entry *entry = iter->ent;
34 struct bputs_entry *field;
35
36 trace_assign_type(field, entry);
37
38 trace_seq_puts(s, field->str);
39
40 return trace_handle_return(s);
41}
42
43enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
44{
45 struct trace_seq *s = &iter->seq;
46 struct trace_entry *entry = iter->ent;
47 struct bprint_entry *field;
48
49 trace_assign_type(field, entry);
50
51 trace_seq_bprintf(s, field->fmt, field->buf);
52
53 return trace_handle_return(s);
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
62 trace_assign_type(field, entry);
63
64 trace_seq_puts(s, field->buf);
65
66 return trace_handle_return(s);
67}
68
69const char *
70trace_print_flags_seq(struct trace_seq *p, const char *delim,
71 unsigned long flags,
72 const struct trace_print_flags *flag_array,
73 size_t flag_array_size)
74{
75 unsigned long mask;
76 const char *str;
77 const char *ret = trace_seq_buffer_ptr(p);
78 int i, first = 1;
79
80 for (i = 0; i < flag_array_size && flags; i++) {
81
82 mask = flag_array[i].mask;
83 if ((flags & mask) != mask)
84 continue;
85
86 str = flag_array[i].name;
87 flags &= ~mask;
88 if (!first && delim)
89 trace_seq_puts(p, delim);
90 else
91 first = 0;
92 trace_seq_puts(p, str);
93 }
94
95 /* check for left over flags */
96 if (flags) {
97 if (!first && delim)
98 trace_seq_puts(p, delim);
99 trace_seq_printf(p, "0x%lx", flags);
100 }
101
102 trace_seq_putc(p, 0);
103
104 return ret;
105}
106EXPORT_SYMBOL(trace_print_flags_seq);
107
108const char *
109trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
110 const struct trace_print_flags *symbol_array,
111 size_t symbol_array_size)
112{
113 int i;
114 const char *ret = trace_seq_buffer_ptr(p);
115
116 for (i = 0; i < symbol_array_size; i++) {
117
118 if (val != symbol_array[i].mask)
119 continue;
120
121 trace_seq_puts(p, symbol_array[i].name);
122 break;
123 }
124
125 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
126 trace_seq_printf(p, "0x%lx", val);
127
128 trace_seq_putc(p, 0);
129
130 return ret;
131}
132EXPORT_SYMBOL(trace_print_symbols_seq);
133
134#if BITS_PER_LONG == 32
135const char *
136trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
137 unsigned long long flags,
138 const struct trace_print_flags_u64 *flag_array,
139 size_t flag_array_size)
140{
141 unsigned long long mask;
142 const char *str;
143 const char *ret = trace_seq_buffer_ptr(p);
144 int i, first = 1;
145
146 for (i = 0; i < flag_array_size && flags; i++) {
147
148 mask = flag_array[i].mask;
149 if ((flags & mask) != mask)
150 continue;
151
152 str = flag_array[i].name;
153 flags &= ~mask;
154 if (!first && delim)
155 trace_seq_puts(p, delim);
156 else
157 first = 0;
158 trace_seq_puts(p, str);
159 }
160
161 /* check for left over flags */
162 if (flags) {
163 if (!first && delim)
164 trace_seq_puts(p, delim);
165 trace_seq_printf(p, "0x%llx", flags);
166 }
167
168 trace_seq_putc(p, 0);
169
170 return ret;
171}
172EXPORT_SYMBOL(trace_print_flags_seq_u64);
173
174const char *
175trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
176 const struct trace_print_flags_u64 *symbol_array,
177 size_t symbol_array_size)
178{
179 int i;
180 const char *ret = trace_seq_buffer_ptr(p);
181
182 for (i = 0; i < symbol_array_size; i++) {
183
184 if (val != symbol_array[i].mask)
185 continue;
186
187 trace_seq_puts(p, symbol_array[i].name);
188 break;
189 }
190
191 if (ret == (const char *)(trace_seq_buffer_ptr(p)))
192 trace_seq_printf(p, "0x%llx", val);
193
194 trace_seq_putc(p, 0);
195
196 return ret;
197}
198EXPORT_SYMBOL(trace_print_symbols_seq_u64);
199#endif
200
201/**
202 * trace_print_bitmask_seq - print a bitmask to a sequence buffer
203 * @iter: The trace iterator for the current event instance
204 * @bitmask_ptr: The pointer to the bitmask data
205 * @bitmask_size: The size of the bitmask in bytes
206 *
207 * Prints a bitmask into a sequence buffer as either a hex string or a
208 * human-readable range list, depending on the instance's "bitmask-list"
209 * trace option. The bitmask is formatted into the iterator's temporary
210 * scratchpad rather than the primary sequence buffer. This avoids
211 * duplication and pointer-collision issues when the returned string is
212 * processed by a "%s" specifier in a TP_printk() macro.
213 *
214 * Returns a pointer to the formatted string within the temporary buffer.
215 */
216const char *
217trace_print_bitmask_seq(struct trace_iterator *iter, void *bitmask_ptr,
218 unsigned int bitmask_size)
219{
220 struct trace_seq *p = &iter->tmp_seq;
221 const struct trace_array *tr = iter->tr;
222 const char *ret;
223
224 trace_seq_init(p);
225 ret = trace_seq_buffer_ptr(p);
226
227 if (tr->trace_flags & TRACE_ITER(BITMASK_LIST))
228 trace_seq_bitmask_list(p, bitmask_ptr, bitmask_size * 8);
229 else
230 trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
231
232 trace_seq_putc(p, 0);
233
234 return ret;
235}
236EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
237
238/**
239 * trace_print_hex_seq - print buffer as hex sequence
240 * @p: trace seq struct to write to
241 * @buf: The buffer to print
242 * @buf_len: Length of @buf in bytes
243 * @concatenate: Print @buf as single hex string or with spacing
244 *
245 * Prints the passed buffer as a hex sequence either as a whole,
246 * single hex string if @concatenate is true or with spacing after
247 * each byte in case @concatenate is false.
248 */
249const char *
250trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
251 bool concatenate)
252{
253 int i;
254 const char *ret = trace_seq_buffer_ptr(p);
255 const char *fmt = concatenate ? "%*phN" : "%*ph";
256
257 for (i = 0; i < buf_len; i += 16) {
258 if (!concatenate && i != 0)
259 trace_seq_putc(p, ' ');
260 trace_seq_printf(p, fmt, min(buf_len - i, 16), &buf[i]);
261 }
262 trace_seq_putc(p, 0);
263
264 return ret;
265}
266EXPORT_SYMBOL(trace_print_hex_seq);
267
268const char *
269trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
270 size_t el_size)
271{
272 const char *ret = trace_seq_buffer_ptr(p);
273 const char *prefix = "";
274 void *ptr = (void *)buf;
275 size_t buf_len = count * el_size;
276
277 trace_seq_putc(p, '{');
278
279 while (ptr < buf + buf_len) {
280 switch (el_size) {
281 case 1:
282 trace_seq_printf(p, "%s0x%x", prefix,
283 *(u8 *)ptr);
284 break;
285 case 2:
286 trace_seq_printf(p, "%s0x%x", prefix,
287 *(u16 *)ptr);
288 break;
289 case 4:
290 trace_seq_printf(p, "%s0x%x", prefix,
291 *(u32 *)ptr);
292 break;
293 case 8:
294 trace_seq_printf(p, "%s0x%llx", prefix,
295 *(u64 *)ptr);
296 break;
297 default:
298 trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
299 *(u8 *)ptr);
300 el_size = 1;
301 }
302 prefix = ",";
303 ptr += el_size;
304 }
305
306 trace_seq_putc(p, '}');
307 trace_seq_putc(p, 0);
308
309 return ret;
310}
311EXPORT_SYMBOL(trace_print_array_seq);
312
313const char *
314trace_print_hex_dump_seq(struct trace_seq *p, const char *prefix_str,
315 int prefix_type, int rowsize, int groupsize,
316 const void *buf, size_t len, bool ascii)
317{
318 const char *ret = trace_seq_buffer_ptr(p);
319
320 trace_seq_putc(p, '\n');
321 trace_seq_hex_dump(p, prefix_str, prefix_type,
322 rowsize, groupsize, buf, len, ascii);
323 trace_seq_putc(p, 0);
324 return ret;
325}
326EXPORT_SYMBOL(trace_print_hex_dump_seq);
327
328int trace_raw_output_prep(struct trace_iterator *iter,
329 struct trace_event *trace_event)
330{
331 struct trace_event_call *event;
332 struct trace_seq *s = &iter->seq;
333 struct trace_seq *p = &iter->tmp_seq;
334 struct trace_entry *entry;
335
336 event = container_of(trace_event, struct trace_event_call, event);
337 entry = iter->ent;
338
339 if (entry->type != event->event.type) {
340 WARN_ON_ONCE(1);
341 return TRACE_TYPE_UNHANDLED;
342 }
343
344 trace_seq_init(p);
345 trace_seq_printf(s, "%s: ", trace_event_name(event));
346
347 return trace_handle_return(s);
348}
349EXPORT_SYMBOL(trace_raw_output_prep);
350
351void trace_event_printf(struct trace_iterator *iter, const char *fmt, ...)
352{
353 struct trace_seq *s = &iter->seq;
354 va_list ap;
355
356 if (ignore_event(iter))
357 return;
358
359 va_start(ap, fmt);
360 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
361 va_end(ap);
362}
363EXPORT_SYMBOL(trace_event_printf);
364
365static __printf(3, 0)
366int trace_output_raw(struct trace_iterator *iter, char *name,
367 char *fmt, va_list ap)
368{
369 struct trace_seq *s = &iter->seq;
370
371 trace_seq_printf(s, "%s: ", name);
372 trace_seq_vprintf(s, trace_event_format(iter, fmt), ap);
373
374 return trace_handle_return(s);
375}
376
377int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
378{
379 va_list ap;
380 int ret;
381
382 va_start(ap, fmt);
383 ret = trace_output_raw(iter, name, fmt, ap);
384 va_end(ap);
385
386 return ret;
387}
388EXPORT_SYMBOL_GPL(trace_output_call);
389
390static inline const char *kretprobed(const char *name, unsigned long addr)
391{
392 if (is_kretprobe_trampoline(addr))
393 return "[unknown/kretprobe'd]";
394 return name;
395}
396
397void
398trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset)
399{
400#ifdef CONFIG_KALLSYMS
401 char str[KSYM_SYMBOL_LEN];
402 const char *name;
403
404 if (offset)
405 sprint_symbol(str, address);
406 else
407 kallsyms_lookup(address, NULL, NULL, NULL, str);
408 name = kretprobed(str, address);
409
410 if (name && strlen(name)) {
411 trace_seq_puts(s, name);
412 return;
413 }
414#endif
415 trace_seq_printf(s, "0x%08lx", address);
416}
417
418#ifndef CONFIG_64BIT
419# define IP_FMT "%08lx"
420#else
421# define IP_FMT "%016lx"
422#endif
423
424static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
425 unsigned long ip, unsigned long sym_flags)
426{
427 struct file *file = NULL;
428 unsigned long vmstart = 0;
429 int ret = 1;
430
431 if (s->full)
432 return 0;
433
434 if (mm) {
435 const struct vm_area_struct *vma;
436
437 mmap_read_lock(mm);
438 vma = find_vma(mm, ip);
439 if (vma) {
440 file = vma->vm_file;
441 vmstart = vma->vm_start;
442 }
443 if (file) {
444 ret = trace_seq_path(s, file_user_path(file));
445 if (ret)
446 trace_seq_printf(s, "[+0x%lx]",
447 ip - vmstart);
448 }
449 mmap_read_unlock(mm);
450 }
451 if (ret && ((sym_flags & TRACE_ITER(SYM_ADDR)) || !file))
452 trace_seq_printf(s, " <" IP_FMT ">", ip);
453 return !trace_seq_has_overflowed(s);
454}
455
456int
457seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
458{
459 if (!ip) {
460 trace_seq_putc(s, '0');
461 goto out;
462 }
463
464 trace_seq_print_sym(s, ip, sym_flags & TRACE_ITER(SYM_OFFSET));
465
466 if (sym_flags & TRACE_ITER(SYM_ADDR))
467 trace_seq_printf(s, " <" IP_FMT ">", ip);
468
469 out:
470 return !trace_seq_has_overflowed(s);
471}
472
473/**
474 * trace_print_lat_fmt - print the irq, preempt and lockdep fields
475 * @s: trace seq struct to write to
476 * @entry: The trace entry field from the ring buffer
477 *
478 * Prints the generic fields of irqs off, in hard or softirq, preempt
479 * count.
480 */
481int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
482{
483 char hardsoft_irq;
484 char need_resched;
485 char irqs_off;
486 int hardirq;
487 int softirq;
488 int bh_off;
489 int nmi;
490
491 nmi = entry->flags & TRACE_FLAG_NMI;
492 hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
493 softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
494 bh_off = entry->flags & TRACE_FLAG_BH_OFF;
495
496 irqs_off =
497 (entry->flags & TRACE_FLAG_IRQS_OFF && bh_off) ? 'D' :
498 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
499 bh_off ? 'b' :
500 '.';
501
502 switch (entry->flags & (TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY |
503 TRACE_FLAG_PREEMPT_RESCHED)) {
504 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
505 need_resched = 'B';
506 break;
507 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
508 need_resched = 'N';
509 break;
510 case TRACE_FLAG_NEED_RESCHED_LAZY | TRACE_FLAG_PREEMPT_RESCHED:
511 need_resched = 'L';
512 break;
513 case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_NEED_RESCHED_LAZY:
514 need_resched = 'b';
515 break;
516 case TRACE_FLAG_NEED_RESCHED:
517 need_resched = 'n';
518 break;
519 case TRACE_FLAG_PREEMPT_RESCHED:
520 need_resched = 'p';
521 break;
522 case TRACE_FLAG_NEED_RESCHED_LAZY:
523 need_resched = 'l';
524 break;
525 default:
526 need_resched = '.';
527 break;
528 }
529
530 hardsoft_irq =
531 (nmi && hardirq) ? 'Z' :
532 nmi ? 'z' :
533 (hardirq && softirq) ? 'H' :
534 hardirq ? 'h' :
535 softirq ? 's' :
536 '.' ;
537
538 trace_seq_printf(s, "%c%c%c",
539 irqs_off, need_resched, hardsoft_irq);
540
541 if (entry->preempt_count & 0xf)
542 trace_seq_printf(s, "%x", entry->preempt_count & 0xf);
543 else
544 trace_seq_putc(s, '.');
545
546 if (entry->preempt_count & 0xf0)
547 trace_seq_printf(s, "%x", entry->preempt_count >> 4);
548 else
549 trace_seq_putc(s, '.');
550
551 return !trace_seq_has_overflowed(s);
552}
553
554static int
555lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
556{
557 char comm[TASK_COMM_LEN];
558
559 trace_find_cmdline(entry->pid, comm);
560
561 trace_seq_printf(s, "%8.8s-%-7d %3d",
562 comm, entry->pid, cpu);
563
564 return trace_print_lat_fmt(s, entry);
565}
566
567#undef MARK
568#define MARK(v, s) {.val = v, .sym = s}
569/* trace overhead mark */
570static const struct trace_mark {
571 unsigned long long val; /* unit: nsec */
572 char sym;
573} mark[] = {
574 MARK(1000000000ULL , '$'), /* 1 sec */
575 MARK(100000000ULL , '@'), /* 100 msec */
576 MARK(10000000ULL , '*'), /* 10 msec */
577 MARK(1000000ULL , '#'), /* 1000 usecs */
578 MARK(100000ULL , '!'), /* 100 usecs */
579 MARK(10000ULL , '+'), /* 10 usecs */
580};
581#undef MARK
582
583char trace_find_mark(unsigned long long d)
584{
585 int i;
586 int size = ARRAY_SIZE(mark);
587
588 for (i = 0; i < size; i++) {
589 if (d > mark[i].val)
590 break;
591 }
592
593 return (i == size) ? ' ' : mark[i].sym;
594}
595
596static int
597lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
598{
599 struct trace_array *tr = iter->tr;
600 unsigned long verbose = tr->trace_flags & TRACE_ITER(VERBOSE);
601 unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
602 unsigned long long abs_ts = iter->ts - iter->array_buffer->time_start;
603 unsigned long long rel_ts = next_ts - iter->ts;
604 struct trace_seq *s = &iter->seq;
605
606 if (in_ns) {
607 abs_ts = ns2usecs(abs_ts);
608 rel_ts = ns2usecs(rel_ts);
609 }
610
611 if (verbose && in_ns) {
612 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
613 unsigned long abs_msec = (unsigned long)abs_ts;
614 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
615 unsigned long rel_msec = (unsigned long)rel_ts;
616
617 trace_seq_printf(
618 s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
619 ns2usecs(iter->ts),
620 abs_msec, abs_usec,
621 rel_msec, rel_usec);
622
623 } else if (verbose && !in_ns) {
624 trace_seq_printf(
625 s, "[%016llx] %lld (+%lld): ",
626 iter->ts, abs_ts, rel_ts);
627
628 } else if (!verbose && in_ns) {
629 trace_seq_printf(
630 s, " %4lldus%c: ",
631 abs_ts,
632 trace_find_mark(rel_ts * NSEC_PER_USEC));
633
634 } else { /* !verbose && !in_ns */
635 trace_seq_printf(s, " %4lld: ", abs_ts);
636 }
637
638 return !trace_seq_has_overflowed(s);
639}
640
641static void trace_print_time(struct trace_seq *s, struct trace_iterator *iter,
642 unsigned long long ts)
643{
644 unsigned long secs, usec_rem;
645 unsigned long long t;
646
647 if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
648 t = ns2usecs(ts);
649 usec_rem = do_div(t, USEC_PER_SEC);
650 secs = (unsigned long)t;
651 trace_seq_printf(s, " %5lu.%06lu", secs, usec_rem);
652 } else
653 trace_seq_printf(s, " %12llu", ts);
654}
655
656int trace_print_context(struct trace_iterator *iter)
657{
658 struct trace_array *tr = iter->tr;
659 struct trace_seq *s = &iter->seq;
660 struct trace_entry *entry = iter->ent;
661 char comm[TASK_COMM_LEN];
662
663 trace_find_cmdline(entry->pid, comm);
664
665 trace_seq_printf(s, "%16s-%-7d ", comm, entry->pid);
666
667 if (tr->trace_flags & TRACE_ITER(RECORD_TGID)) {
668 unsigned int tgid = trace_find_tgid(entry->pid);
669
670 if (!tgid)
671 trace_seq_printf(s, "(-------) ");
672 else
673 trace_seq_printf(s, "(%7d) ", tgid);
674 }
675
676 trace_seq_printf(s, "[%03d] ", iter->cpu);
677
678 if (tr->trace_flags & TRACE_ITER(IRQ_INFO))
679 trace_print_lat_fmt(s, entry);
680
681 trace_print_time(s, iter, iter->ts);
682 trace_seq_puts(s, ": ");
683
684 return !trace_seq_has_overflowed(s);
685}
686
687int trace_print_lat_context(struct trace_iterator *iter)
688{
689 struct trace_entry *entry, *next_entry;
690 struct trace_array *tr = iter->tr;
691 struct trace_seq *s = &iter->seq;
692 unsigned long verbose = (tr->trace_flags & TRACE_ITER(VERBOSE));
693 u64 next_ts;
694
695 next_entry = trace_find_next_entry(iter, NULL, &next_ts);
696 if (!next_entry)
697 next_ts = iter->ts;
698
699 /* trace_find_next_entry() may change iter->ent */
700 entry = iter->ent;
701
702 if (verbose) {
703 char comm[TASK_COMM_LEN];
704
705 trace_find_cmdline(entry->pid, comm);
706
707 trace_seq_printf(
708 s, "%16s %7d %3d %d %08x %08lx ",
709 comm, entry->pid, iter->cpu, entry->flags,
710 entry->preempt_count & 0xf, iter->idx);
711 } else {
712 lat_print_generic(s, entry, iter->cpu);
713 }
714
715 lat_print_timestamp(iter, next_ts);
716
717 return !trace_seq_has_overflowed(s);
718}
719
720#ifdef CONFIG_FUNCTION_TRACE_ARGS
721void print_function_args(struct trace_seq *s, unsigned long *args,
722 unsigned long func)
723{
724 const struct btf_param *param;
725 const struct btf_type *t;
726 const struct btf_enum *enums;
727 const char *param_name;
728 char name[KSYM_NAME_LEN];
729 unsigned long arg;
730 struct btf *btf;
731 s32 tid, nr = 0;
732 int a, p, x, i;
733 u16 encode;
734
735 trace_seq_printf(s, "(");
736
737 if (!args)
738 goto out;
739 if (lookup_symbol_name(func, name))
740 goto out;
741
742 /* TODO: Pass module name here too */
743 t = btf_find_func_proto(name, &btf);
744 if (IS_ERR_OR_NULL(t))
745 goto out;
746
747 param = btf_get_func_param(t, &nr);
748 if (!param)
749 goto out_put;
750
751 for (a = 0, p = 0; p < nr; a++, p++) {
752 if (p)
753 trace_seq_puts(s, ", ");
754
755 /* This only prints what the arch allows (6 args by default) */
756 if (a == FTRACE_REGS_MAX_ARGS) {
757 trace_seq_puts(s, "...");
758 break;
759 }
760
761 arg = args[a];
762
763 param_name = btf_name_by_offset(btf, param[p].name_off);
764 if (param_name)
765 trace_seq_printf(s, "%s=", param_name);
766 t = btf_type_skip_modifiers(btf, param[p].type, &tid);
767
768 switch (t ? BTF_INFO_KIND(t->info) : BTF_KIND_UNKN) {
769 case BTF_KIND_UNKN:
770 trace_seq_putc(s, '?');
771 /* Still print unknown type values */
772 fallthrough;
773 case BTF_KIND_PTR:
774 trace_seq_printf(s, "0x%lx", arg);
775 break;
776 case BTF_KIND_INT:
777 encode = btf_int_encoding(t);
778 /* Print unsigned ints as hex */
779 if (encode & BTF_INT_SIGNED)
780 trace_seq_printf(s, "%ld", arg);
781 else
782 trace_seq_printf(s, "0x%lx", arg);
783 break;
784 case BTF_KIND_ENUM:
785 trace_seq_printf(s, "%ld", arg);
786 enums = btf_enum(t);
787 for (i = 0; i < btf_vlen(t); i++) {
788 if (arg == enums[i].val) {
789 trace_seq_printf(s, " [%s]",
790 btf_name_by_offset(btf,
791 enums[i].name_off));
792 break;
793 }
794 }
795 break;
796 default:
797 /* This does not handle complex arguments */
798 trace_seq_printf(s, "(%s)[0x%lx", btf_type_str(t), arg);
799 for (x = sizeof(long); x < t->size; x += sizeof(long)) {
800 trace_seq_putc(s, ':');
801 if (++a == FTRACE_REGS_MAX_ARGS) {
802 trace_seq_puts(s, "...]");
803 goto out_put;
804 }
805 trace_seq_printf(s, "0x%lx", args[a]);
806 }
807 trace_seq_putc(s, ']');
808 break;
809 }
810 }
811out_put:
812 btf_put(btf);
813out:
814 trace_seq_printf(s, ")");
815}
816#endif
817
818/**
819 * ftrace_find_event - find a registered event
820 * @type: the type of event to look for
821 *
822 * Returns an event of type @type otherwise NULL
823 * Called with trace_event_read_lock() held.
824 */
825struct trace_event *ftrace_find_event(int type)
826{
827 struct trace_event *event;
828
829 hash_for_each_possible(event_hash, event, node, type) {
830 if (event->type == type)
831 return event;
832 }
833
834 return NULL;
835}
836
837static DEFINE_IDA(trace_event_ida);
838
839static void free_trace_event_type(int type)
840{
841 if (type >= __TRACE_LAST_TYPE)
842 ida_free(&trace_event_ida, type);
843}
844
845static int alloc_trace_event_type(void)
846{
847 int next;
848
849 /* Skip static defined type numbers */
850 next = ida_alloc_range(&trace_event_ida, __TRACE_LAST_TYPE,
851 TRACE_EVENT_TYPE_MAX, GFP_KERNEL);
852 if (next < 0)
853 return 0;
854 return next;
855}
856
857void trace_event_read_lock(void)
858{
859 down_read(&trace_event_sem);
860}
861
862void trace_event_read_unlock(void)
863{
864 up_read(&trace_event_sem);
865}
866
867/**
868 * register_trace_event - register output for an event type
869 * @event: the event type to register
870 *
871 * Event types are stored in a hash and this hash is used to
872 * find a way to print an event. If the @event->type is set
873 * then it will use that type, otherwise it will assign a
874 * type to use.
875 *
876 * If you assign your own type, please make sure it is added
877 * to the trace_type enum in trace.h, to avoid collisions
878 * with the dynamic types.
879 *
880 * Returns the event type number or zero on error.
881 */
882int register_trace_event(struct trace_event *event)
883{
884 int ret = 0;
885
886 down_write(&trace_event_sem);
887
888 if (WARN_ON(!event))
889 goto out;
890
891 if (WARN_ON(!event->funcs))
892 goto out;
893
894 if (!event->type) {
895 event->type = alloc_trace_event_type();
896 if (!event->type)
897 goto out;
898 } else if (WARN(event->type > __TRACE_LAST_TYPE,
899 "Need to add type to trace.h")) {
900 goto out;
901 } else {
902 /* Is this event already used */
903 if (ftrace_find_event(event->type))
904 goto out;
905 }
906
907 if (event->funcs->trace == NULL)
908 event->funcs->trace = trace_nop_print;
909 if (event->funcs->raw == NULL)
910 event->funcs->raw = trace_nop_print;
911 if (event->funcs->hex == NULL)
912 event->funcs->hex = trace_nop_print;
913 if (event->funcs->binary == NULL)
914 event->funcs->binary = trace_nop_print;
915
916 hash_add(event_hash, &event->node, event->type);
917
918 ret = event->type;
919 out:
920 up_write(&trace_event_sem);
921
922 return ret;
923}
924EXPORT_SYMBOL_GPL(register_trace_event);
925
926/*
927 * Used by module code with the trace_event_sem held for write.
928 */
929int __unregister_trace_event(struct trace_event *event)
930{
931 hash_del(&event->node);
932 free_trace_event_type(event->type);
933 return 0;
934}
935
936/**
937 * unregister_trace_event - remove a no longer used event
938 * @event: the event to remove
939 */
940int unregister_trace_event(struct trace_event *event)
941{
942 down_write(&trace_event_sem);
943 __unregister_trace_event(event);
944 up_write(&trace_event_sem);
945
946 return 0;
947}
948EXPORT_SYMBOL_GPL(unregister_trace_event);
949
950/*
951 * Standard events
952 */
953
954static void print_array(struct trace_iterator *iter, void *pos,
955 struct ftrace_event_field *field)
956{
957 int offset;
958 int len;
959 int i;
960
961 offset = *(int *)pos & 0xffff;
962 len = *(int *)pos >> 16;
963
964 if (field)
965 offset += field->offset + sizeof(int);
966
967 if (offset + len > iter->ent_size) {
968 trace_seq_puts(&iter->seq, "<OVERFLOW>");
969 return;
970 }
971
972 pos = (void *)iter->ent + offset;
973
974 for (i = 0; i < len; i++, pos++) {
975 if (i)
976 trace_seq_putc(&iter->seq, ',');
977 trace_seq_printf(&iter->seq, "%02x", *(unsigned char *)pos);
978 }
979}
980
981static void print_fields(struct trace_iterator *iter, struct trace_event_call *call,
982 struct list_head *head)
983{
984 struct ftrace_event_field *field;
985 struct trace_array *tr = iter->tr;
986 unsigned long long laddr;
987 unsigned long addr;
988 int offset;
989 int len;
990 int ret;
991 int i;
992 void *pos;
993 char *str;
994
995 list_for_each_entry_reverse(field, head, link) {
996 trace_seq_printf(&iter->seq, " %s=", field->name);
997 if (field->offset + field->size > iter->ent_size) {
998 trace_seq_puts(&iter->seq, "<OVERFLOW>");
999 continue;
1000 }
1001 pos = (void *)iter->ent + field->offset;
1002
1003 switch (field->filter_type) {
1004 case FILTER_COMM:
1005 case FILTER_STATIC_STRING:
1006 trace_seq_printf(&iter->seq, "%.*s", field->size, (char *)pos);
1007 break;
1008 case FILTER_RDYN_STRING:
1009 case FILTER_DYN_STRING:
1010 offset = *(int *)pos & 0xffff;
1011 len = *(int *)pos >> 16;
1012
1013 if (field->filter_type == FILTER_RDYN_STRING)
1014 offset += field->offset + sizeof(int);
1015
1016 if (offset + len > iter->ent_size) {
1017 trace_seq_puts(&iter->seq, "<OVERFLOW>");
1018 break;
1019 }
1020 str = (char *)iter->ent + offset;
1021 /* Check if there's any non printable strings */
1022 for (i = 0; i < len; i++) {
1023 if (str[i] && !(isascii(str[i]) && isprint(str[i])))
1024 break;
1025 }
1026 if (i < len) {
1027 for (i = 0; i < len; i++) {
1028 if (isascii(str[i]) && isprint(str[i]))
1029 trace_seq_putc(&iter->seq, str[i]);
1030 else
1031 trace_seq_putc(&iter->seq, '.');
1032 }
1033 trace_seq_puts(&iter->seq, " (");
1034 for (i = 0; i < len; i++) {
1035 if (i)
1036 trace_seq_putc(&iter->seq, ':');
1037 trace_seq_printf(&iter->seq, "%02x", str[i]);
1038 }
1039 trace_seq_putc(&iter->seq, ')');
1040 } else {
1041 trace_seq_printf(&iter->seq, "%.*s", len, str);
1042 }
1043 break;
1044 case FILTER_PTR_STRING:
1045 if (!iter->fmt_size)
1046 trace_iter_expand_format(iter);
1047 addr = trace_adjust_address(tr, *(unsigned long *)pos);
1048 ret = strncpy_from_kernel_nofault(iter->fmt, (void *)addr,
1049 iter->fmt_size);
1050 if (ret < 0)
1051 trace_seq_printf(&iter->seq, "(0x%px)", pos);
1052 else
1053 trace_seq_printf(&iter->seq, "(0x%px:%s)",
1054 pos, iter->fmt);
1055 break;
1056 case FILTER_TRACE_FN:
1057 addr = trace_adjust_address(tr, *(unsigned long *)pos);
1058 trace_seq_printf(&iter->seq, "%pS", (void *)addr);
1059 break;
1060 case FILTER_CPU:
1061 case FILTER_OTHER:
1062 switch (field->size) {
1063 case 1:
1064 if (isprint(*(char *)pos)) {
1065 trace_seq_printf(&iter->seq, "'%c'",
1066 *(unsigned char *)pos);
1067 }
1068 trace_seq_printf(&iter->seq, "(%d)",
1069 *(unsigned char *)pos);
1070 break;
1071 case 2:
1072 trace_seq_printf(&iter->seq, "0x%x (%d)",
1073 *(unsigned short *)pos,
1074 *(unsigned short *)pos);
1075 break;
1076 case 4:
1077 /* dynamic array info is 4 bytes */
1078 if (strstr(field->type, "__data_loc")) {
1079 print_array(iter, pos, NULL);
1080 break;
1081 }
1082
1083 if (strstr(field->type, "__rel_loc")) {
1084 print_array(iter, pos, field);
1085 break;
1086 }
1087
1088 addr = *(unsigned int *)pos;
1089
1090 /* Some fields reference offset from _stext. */
1091 if (!strcmp(field->name, "caller_offs") ||
1092 !strcmp(field->name, "parent_offs")) {
1093 unsigned long ip;
1094
1095 ip = addr + (unsigned long)_stext;
1096 ip = trace_adjust_address(tr, ip);
1097 trace_seq_printf(&iter->seq, "%pS ", (void *)ip);
1098 }
1099
1100 if (sizeof(long) == 4) {
1101 addr = trace_adjust_address(tr, addr);
1102 trace_seq_printf(&iter->seq, "%pS (%d)",
1103 (void *)addr, (int)addr);
1104 } else {
1105 trace_seq_printf(&iter->seq, "0x%x (%d)",
1106 (unsigned int)addr, (int)addr);
1107 }
1108 break;
1109 case 8:
1110 laddr = *(unsigned long long *)pos;
1111 if (sizeof(long) == 8) {
1112 laddr = trace_adjust_address(tr, (unsigned long)laddr);
1113 trace_seq_printf(&iter->seq, "%pS (%lld)",
1114 (void *)(long)laddr, laddr);
1115 } else {
1116 trace_seq_printf(&iter->seq, "0x%llx (%lld)", laddr, laddr);
1117 }
1118 break;
1119 default:
1120 trace_seq_puts(&iter->seq, "<INVALID-SIZE>");
1121 break;
1122 }
1123 break;
1124 default:
1125 trace_seq_puts(&iter->seq, "<INVALID-TYPE>");
1126 }
1127 }
1128 trace_seq_putc(&iter->seq, '\n');
1129}
1130
1131enum print_line_t print_event_fields(struct trace_iterator *iter,
1132 struct trace_event *event)
1133{
1134 struct trace_event_call *call;
1135 struct list_head *head;
1136
1137 lockdep_assert_held_read(&trace_event_sem);
1138
1139 /* ftrace defined events have separate call structures */
1140 if (event->type <= __TRACE_LAST_TYPE) {
1141 bool found = false;
1142
1143 list_for_each_entry(call, &ftrace_events, list) {
1144 if (call->event.type == event->type) {
1145 found = true;
1146 break;
1147 }
1148 /* No need to search all events */
1149 if (call->event.type > __TRACE_LAST_TYPE)
1150 break;
1151 }
1152 if (!found) {
1153 trace_seq_printf(&iter->seq, "UNKNOWN TYPE %d\n", event->type);
1154 goto out;
1155 }
1156 } else {
1157 call = container_of(event, struct trace_event_call, event);
1158 }
1159 head = trace_get_fields(call);
1160
1161 trace_seq_printf(&iter->seq, "%s:", trace_event_name(call));
1162
1163 if (head && !list_empty(head))
1164 print_fields(iter, call, head);
1165 else
1166 trace_seq_puts(&iter->seq, "No fields found\n");
1167
1168 out:
1169 return trace_handle_return(&iter->seq);
1170}
1171
1172enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
1173 struct trace_event *event)
1174{
1175 trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
1176
1177 return trace_handle_return(&iter->seq);
1178}
1179
1180static void print_fn_trace(struct trace_seq *s, unsigned long ip,
1181 unsigned long parent_ip, unsigned long *args,
1182 struct trace_array *tr, int flags)
1183{
1184 ip = trace_adjust_address(tr, ip);
1185 parent_ip = trace_adjust_address(tr, parent_ip);
1186
1187 seq_print_ip_sym(s, ip, flags);
1188 if (args)
1189 print_function_args(s, args, ip);
1190
1191 if ((flags & TRACE_ITER(PRINT_PARENT)) && parent_ip) {
1192 trace_seq_puts(s, " <-");
1193 seq_print_ip_sym(s, parent_ip, flags);
1194 }
1195}
1196
1197/* TRACE_FN */
1198static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
1199 struct trace_event *event)
1200{
1201 struct ftrace_entry *field;
1202 struct trace_seq *s = &iter->seq;
1203 unsigned long *args;
1204 int args_size;
1205
1206 trace_assign_type(field, iter->ent);
1207
1208 args_size = iter->ent_size - offsetof(struct ftrace_entry, args);
1209 if (args_size >= FTRACE_REGS_MAX_ARGS * sizeof(long))
1210 args = field->args;
1211 else
1212 args = NULL;
1213
1214 print_fn_trace(s, field->ip, field->parent_ip, args, iter->tr, flags);
1215 trace_seq_putc(s, '\n');
1216
1217 return trace_handle_return(s);
1218}
1219
1220static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
1221 struct trace_event *event)
1222{
1223 struct ftrace_entry *field;
1224
1225 trace_assign_type(field, iter->ent);
1226
1227 trace_seq_printf(&iter->seq, "%lx %lx\n",
1228 field->ip,
1229 field->parent_ip);
1230
1231 return trace_handle_return(&iter->seq);
1232}
1233
1234static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
1235 struct trace_event *event)
1236{
1237 struct ftrace_entry *field;
1238 struct trace_seq *s = &iter->seq;
1239
1240 trace_assign_type(field, iter->ent);
1241
1242 SEQ_PUT_HEX_FIELD(s, field->ip);
1243 SEQ_PUT_HEX_FIELD(s, field->parent_ip);
1244
1245 return trace_handle_return(s);
1246}
1247
1248static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
1249 struct trace_event *event)
1250{
1251 struct ftrace_entry *field;
1252 struct trace_seq *s = &iter->seq;
1253
1254 trace_assign_type(field, iter->ent);
1255
1256 SEQ_PUT_FIELD(s, field->ip);
1257 SEQ_PUT_FIELD(s, field->parent_ip);
1258
1259 return trace_handle_return(s);
1260}
1261
1262static struct trace_event_functions trace_fn_funcs = {
1263 .trace = trace_fn_trace,
1264 .raw = trace_fn_raw,
1265 .hex = trace_fn_hex,
1266 .binary = trace_fn_bin,
1267};
1268
1269static struct trace_event trace_fn_event = {
1270 .type = TRACE_FN,
1271 .funcs = &trace_fn_funcs,
1272};
1273
1274/* TRACE_CTX an TRACE_WAKE */
1275static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
1276 char *delim)
1277{
1278 struct ctx_switch_entry *field;
1279 char comm[TASK_COMM_LEN];
1280 int S, T;
1281
1282
1283 trace_assign_type(field, iter->ent);
1284
1285 T = task_index_to_char(field->next_state);
1286 S = task_index_to_char(field->prev_state);
1287 trace_find_cmdline(field->next_pid, comm);
1288 trace_seq_printf(&iter->seq,
1289 " %7d:%3d:%c %s [%03d] %7d:%3d:%c %s\n",
1290 field->prev_pid,
1291 field->prev_prio,
1292 S, delim,
1293 field->next_cpu,
1294 field->next_pid,
1295 field->next_prio,
1296 T, comm);
1297
1298 return trace_handle_return(&iter->seq);
1299}
1300
1301static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
1302 struct trace_event *event)
1303{
1304 return trace_ctxwake_print(iter, "==>");
1305}
1306
1307static enum print_line_t trace_wake_print(struct trace_iterator *iter,
1308 int flags, struct trace_event *event)
1309{
1310 return trace_ctxwake_print(iter, " +");
1311}
1312
1313static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
1314{
1315 struct ctx_switch_entry *field;
1316 int T;
1317
1318 trace_assign_type(field, iter->ent);
1319
1320 if (!S)
1321 S = task_index_to_char(field->prev_state);
1322 T = task_index_to_char(field->next_state);
1323 trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
1324 field->prev_pid,
1325 field->prev_prio,
1326 S,
1327 field->next_cpu,
1328 field->next_pid,
1329 field->next_prio,
1330 T);
1331
1332 return trace_handle_return(&iter->seq);
1333}
1334
1335static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
1336 struct trace_event *event)
1337{
1338 return trace_ctxwake_raw(iter, 0);
1339}
1340
1341static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
1342 struct trace_event *event)
1343{
1344 return trace_ctxwake_raw(iter, '+');
1345}
1346
1347
1348static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
1349{
1350 struct ctx_switch_entry *field;
1351 struct trace_seq *s = &iter->seq;
1352 int T;
1353
1354 trace_assign_type(field, iter->ent);
1355
1356 if (!S)
1357 S = task_index_to_char(field->prev_state);
1358 T = task_index_to_char(field->next_state);
1359
1360 SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1361 SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1362 SEQ_PUT_HEX_FIELD(s, S);
1363 SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1364 SEQ_PUT_HEX_FIELD(s, field->next_pid);
1365 SEQ_PUT_HEX_FIELD(s, field->next_prio);
1366 SEQ_PUT_HEX_FIELD(s, T);
1367
1368 return trace_handle_return(s);
1369}
1370
1371static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1372 struct trace_event *event)
1373{
1374 return trace_ctxwake_hex(iter, 0);
1375}
1376
1377static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1378 struct trace_event *event)
1379{
1380 return trace_ctxwake_hex(iter, '+');
1381}
1382
1383static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1384 int flags, struct trace_event *event)
1385{
1386 struct ctx_switch_entry *field;
1387 struct trace_seq *s = &iter->seq;
1388
1389 trace_assign_type(field, iter->ent);
1390
1391 SEQ_PUT_FIELD(s, field->prev_pid);
1392 SEQ_PUT_FIELD(s, field->prev_prio);
1393 SEQ_PUT_FIELD(s, field->prev_state);
1394 SEQ_PUT_FIELD(s, field->next_cpu);
1395 SEQ_PUT_FIELD(s, field->next_pid);
1396 SEQ_PUT_FIELD(s, field->next_prio);
1397 SEQ_PUT_FIELD(s, field->next_state);
1398
1399 return trace_handle_return(s);
1400}
1401
1402static struct trace_event_functions trace_ctx_funcs = {
1403 .trace = trace_ctx_print,
1404 .raw = trace_ctx_raw,
1405 .hex = trace_ctx_hex,
1406 .binary = trace_ctxwake_bin,
1407};
1408
1409static struct trace_event trace_ctx_event = {
1410 .type = TRACE_CTX,
1411 .funcs = &trace_ctx_funcs,
1412};
1413
1414static struct trace_event_functions trace_wake_funcs = {
1415 .trace = trace_wake_print,
1416 .raw = trace_wake_raw,
1417 .hex = trace_wake_hex,
1418 .binary = trace_ctxwake_bin,
1419};
1420
1421static struct trace_event trace_wake_event = {
1422 .type = TRACE_WAKE,
1423 .funcs = &trace_wake_funcs,
1424};
1425
1426/* TRACE_STACK */
1427
1428static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1429 int flags, struct trace_event *event)
1430{
1431 struct stack_entry *field;
1432 struct trace_seq *s = &iter->seq;
1433 unsigned long *p;
1434 unsigned long *end;
1435
1436 trace_assign_type(field, iter->ent);
1437 end = (unsigned long *)((long)iter->ent + iter->ent_size);
1438
1439 trace_seq_puts(s, "<stack trace>\n");
1440
1441 for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {
1442
1443 if (trace_seq_has_overflowed(s))
1444 break;
1445
1446 trace_seq_puts(s, " => ");
1447 if ((*p) == FTRACE_TRAMPOLINE_MARKER) {
1448 trace_seq_puts(s, "[FTRACE TRAMPOLINE]\n");
1449 continue;
1450 }
1451 seq_print_ip_sym(s, trace_adjust_address(iter->tr, *p), flags);
1452 trace_seq_putc(s, '\n');
1453 }
1454
1455 return trace_handle_return(s);
1456}
1457
1458static struct trace_event_functions trace_stack_funcs = {
1459 .trace = trace_stack_print,
1460};
1461
1462static struct trace_event trace_stack_event = {
1463 .type = TRACE_STACK,
1464 .funcs = &trace_stack_funcs,
1465};
1466
1467/* TRACE_USER_STACK */
1468static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1469 int flags, struct trace_event *event)
1470{
1471 struct trace_array *tr = iter->tr;
1472 struct userstack_entry *field;
1473 struct trace_seq *s = &iter->seq;
1474 struct mm_struct *mm = NULL;
1475 unsigned int i;
1476
1477 trace_assign_type(field, iter->ent);
1478
1479 trace_seq_puts(s, "<user stack trace>\n");
1480
1481 if (tr->trace_flags & TRACE_ITER(SYM_USEROBJ)) {
1482 struct task_struct *task;
1483 /*
1484 * we do the lookup on the thread group leader,
1485 * since individual threads might have already quit!
1486 */
1487 rcu_read_lock();
1488 task = find_task_by_vpid(field->tgid);
1489 if (task)
1490 mm = get_task_mm(task);
1491 rcu_read_unlock();
1492 }
1493
1494 for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1495 unsigned long ip = field->caller[i];
1496
1497 if (!ip || trace_seq_has_overflowed(s))
1498 break;
1499
1500 trace_seq_puts(s, " => ");
1501 seq_print_user_ip(s, mm, ip, flags);
1502 trace_seq_putc(s, '\n');
1503 }
1504
1505 if (mm)
1506 mmput(mm);
1507
1508 return trace_handle_return(s);
1509}
1510
1511static struct trace_event_functions trace_user_stack_funcs = {
1512 .trace = trace_user_stack_print,
1513};
1514
1515static struct trace_event trace_user_stack_event = {
1516 .type = TRACE_USER_STACK,
1517 .funcs = &trace_user_stack_funcs,
1518};
1519
1520/* TRACE_HWLAT */
1521static enum print_line_t
1522trace_hwlat_print(struct trace_iterator *iter, int flags,
1523 struct trace_event *event)
1524{
1525 struct trace_entry *entry = iter->ent;
1526 struct trace_seq *s = &iter->seq;
1527 struct hwlat_entry *field;
1528
1529 trace_assign_type(field, entry);
1530
1531 trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%ptSp count:%d",
1532 field->seqnum,
1533 field->duration,
1534 field->outer_duration,
1535 &field->timestamp,
1536 field->count);
1537
1538 if (field->nmi_count) {
1539 /*
1540 * The generic sched_clock() is not NMI safe, thus
1541 * we only record the count and not the time.
1542 */
1543 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1544 trace_seq_printf(s, " nmi-total:%llu",
1545 field->nmi_total_ts);
1546 trace_seq_printf(s, " nmi-count:%u",
1547 field->nmi_count);
1548 }
1549
1550 trace_seq_putc(s, '\n');
1551
1552 return trace_handle_return(s);
1553}
1554
1555static enum print_line_t
1556trace_hwlat_raw(struct trace_iterator *iter, int flags,
1557 struct trace_event *event)
1558{
1559 struct hwlat_entry *field;
1560 struct trace_seq *s = &iter->seq;
1561
1562 trace_assign_type(field, iter->ent);
1563
1564 trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1565 field->duration,
1566 field->outer_duration,
1567 (long long)field->timestamp.tv_sec,
1568 field->timestamp.tv_nsec,
1569 field->seqnum);
1570
1571 return trace_handle_return(s);
1572}
1573
1574static struct trace_event_functions trace_hwlat_funcs = {
1575 .trace = trace_hwlat_print,
1576 .raw = trace_hwlat_raw,
1577};
1578
1579static struct trace_event trace_hwlat_event = {
1580 .type = TRACE_HWLAT,
1581 .funcs = &trace_hwlat_funcs,
1582};
1583
1584/* TRACE_OSNOISE */
1585static enum print_line_t
1586trace_osnoise_print(struct trace_iterator *iter, int flags,
1587 struct trace_event *event)
1588{
1589 struct trace_entry *entry = iter->ent;
1590 struct trace_seq *s = &iter->seq;
1591 struct osnoise_entry *field;
1592 u64 ratio, ratio_dec;
1593 u64 net_runtime;
1594
1595 trace_assign_type(field, entry);
1596
1597 /*
1598 * compute the available % of cpu time.
1599 */
1600 net_runtime = field->runtime - field->noise;
1601 ratio = net_runtime * 10000000;
1602 do_div(ratio, field->runtime);
1603 ratio_dec = do_div(ratio, 100000);
1604
1605 trace_seq_printf(s, "%llu %10llu %3llu.%05llu %7llu",
1606 field->runtime,
1607 field->noise,
1608 ratio, ratio_dec,
1609 field->max_sample);
1610
1611 trace_seq_printf(s, " %6u", field->hw_count);
1612 trace_seq_printf(s, " %6u", field->nmi_count);
1613 trace_seq_printf(s, " %6u", field->irq_count);
1614 trace_seq_printf(s, " %6u", field->softirq_count);
1615 trace_seq_printf(s, " %6u", field->thread_count);
1616
1617 trace_seq_putc(s, '\n');
1618
1619 return trace_handle_return(s);
1620}
1621
1622static enum print_line_t
1623trace_osnoise_raw(struct trace_iterator *iter, int flags,
1624 struct trace_event *event)
1625{
1626 struct osnoise_entry *field;
1627 struct trace_seq *s = &iter->seq;
1628
1629 trace_assign_type(field, iter->ent);
1630
1631 trace_seq_printf(s, "%lld %llu %llu %u %u %u %u %u\n",
1632 field->runtime,
1633 field->noise,
1634 field->max_sample,
1635 field->hw_count,
1636 field->nmi_count,
1637 field->irq_count,
1638 field->softirq_count,
1639 field->thread_count);
1640
1641 return trace_handle_return(s);
1642}
1643
1644static struct trace_event_functions trace_osnoise_funcs = {
1645 .trace = trace_osnoise_print,
1646 .raw = trace_osnoise_raw,
1647};
1648
1649static struct trace_event trace_osnoise_event = {
1650 .type = TRACE_OSNOISE,
1651 .funcs = &trace_osnoise_funcs,
1652};
1653
1654/* TRACE_TIMERLAT */
1655
1656static char *timerlat_lat_context[] = {"irq", "thread", "user-ret"};
1657static enum print_line_t
1658trace_timerlat_print(struct trace_iterator *iter, int flags,
1659 struct trace_event *event)
1660{
1661 struct trace_entry *entry = iter->ent;
1662 struct trace_seq *s = &iter->seq;
1663 struct timerlat_entry *field;
1664
1665 trace_assign_type(field, entry);
1666
1667 trace_seq_printf(s, "#%-5u context %6s timer_latency %9llu ns\n",
1668 field->seqnum,
1669 timerlat_lat_context[field->context],
1670 field->timer_latency);
1671
1672 return trace_handle_return(s);
1673}
1674
1675static enum print_line_t
1676trace_timerlat_raw(struct trace_iterator *iter, int flags,
1677 struct trace_event *event)
1678{
1679 struct timerlat_entry *field;
1680 struct trace_seq *s = &iter->seq;
1681
1682 trace_assign_type(field, iter->ent);
1683
1684 trace_seq_printf(s, "%u %d %llu\n",
1685 field->seqnum,
1686 field->context,
1687 field->timer_latency);
1688
1689 return trace_handle_return(s);
1690}
1691
1692static struct trace_event_functions trace_timerlat_funcs = {
1693 .trace = trace_timerlat_print,
1694 .raw = trace_timerlat_raw,
1695};
1696
1697static struct trace_event trace_timerlat_event = {
1698 .type = TRACE_TIMERLAT,
1699 .funcs = &trace_timerlat_funcs,
1700};
1701
1702/* TRACE_BPUTS */
1703static enum print_line_t
1704trace_bputs_print(struct trace_iterator *iter, int flags,
1705 struct trace_event *event)
1706{
1707 struct trace_entry *entry = iter->ent;
1708 struct trace_seq *s = &iter->seq;
1709 struct bputs_entry *field;
1710
1711 trace_assign_type(field, entry);
1712
1713 seq_print_ip_sym(s, field->ip, flags);
1714 trace_seq_puts(s, ": ");
1715 trace_seq_puts(s, field->str);
1716
1717 return trace_handle_return(s);
1718}
1719
1720
1721static enum print_line_t
1722trace_bputs_raw(struct trace_iterator *iter, int flags,
1723 struct trace_event *event)
1724{
1725 struct bputs_entry *field;
1726 struct trace_seq *s = &iter->seq;
1727
1728 trace_assign_type(field, iter->ent);
1729
1730 trace_seq_printf(s, ": %lx : ", field->ip);
1731 trace_seq_puts(s, field->str);
1732
1733 return trace_handle_return(s);
1734}
1735
1736static struct trace_event_functions trace_bputs_funcs = {
1737 .trace = trace_bputs_print,
1738 .raw = trace_bputs_raw,
1739};
1740
1741static struct trace_event trace_bputs_event = {
1742 .type = TRACE_BPUTS,
1743 .funcs = &trace_bputs_funcs,
1744};
1745
1746/* TRACE_BPRINT */
1747static enum print_line_t
1748trace_bprint_print(struct trace_iterator *iter, int flags,
1749 struct trace_event *event)
1750{
1751 struct trace_entry *entry = iter->ent;
1752 struct trace_seq *s = &iter->seq;
1753 struct bprint_entry *field;
1754
1755 trace_assign_type(field, entry);
1756
1757 seq_print_ip_sym(s, field->ip, flags);
1758 trace_seq_puts(s, ": ");
1759 trace_seq_bprintf(s, field->fmt, field->buf);
1760
1761 return trace_handle_return(s);
1762}
1763
1764
1765static enum print_line_t
1766trace_bprint_raw(struct trace_iterator *iter, int flags,
1767 struct trace_event *event)
1768{
1769 struct bprint_entry *field;
1770 struct trace_seq *s = &iter->seq;
1771
1772 trace_assign_type(field, iter->ent);
1773
1774 trace_seq_printf(s, ": %lx : ", field->ip);
1775 trace_seq_bprintf(s, field->fmt, field->buf);
1776
1777 return trace_handle_return(s);
1778}
1779
1780static struct trace_event_functions trace_bprint_funcs = {
1781 .trace = trace_bprint_print,
1782 .raw = trace_bprint_raw,
1783};
1784
1785static struct trace_event trace_bprint_event = {
1786 .type = TRACE_BPRINT,
1787 .funcs = &trace_bprint_funcs,
1788};
1789
1790/* TRACE_PRINT */
1791static enum print_line_t trace_print_print(struct trace_iterator *iter,
1792 int flags, struct trace_event *event)
1793{
1794 struct print_entry *field;
1795 struct trace_seq *s = &iter->seq;
1796 unsigned long ip;
1797
1798 trace_assign_type(field, iter->ent);
1799
1800 ip = trace_adjust_address(iter->tr, field->ip);
1801
1802 seq_print_ip_sym(s, ip, flags);
1803 trace_seq_printf(s, ": %s", field->buf);
1804
1805 return trace_handle_return(s);
1806}
1807
1808static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1809 struct trace_event *event)
1810{
1811 struct print_entry *field;
1812
1813 trace_assign_type(field, iter->ent);
1814
1815 trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1816
1817 return trace_handle_return(&iter->seq);
1818}
1819
1820static struct trace_event_functions trace_print_funcs = {
1821 .trace = trace_print_print,
1822 .raw = trace_print_raw,
1823};
1824
1825static struct trace_event trace_print_event = {
1826 .type = TRACE_PRINT,
1827 .funcs = &trace_print_funcs,
1828};
1829
1830static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1831 struct trace_event *event)
1832{
1833 struct raw_data_entry *field;
1834 int i;
1835
1836 trace_assign_type(field, iter->ent);
1837
1838 trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1839
1840 for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1841 trace_seq_printf(&iter->seq, " %02x",
1842 (unsigned char)field->buf[i]);
1843
1844 trace_seq_putc(&iter->seq, '\n');
1845
1846 return trace_handle_return(&iter->seq);
1847}
1848
1849static struct trace_event_functions trace_raw_data_funcs = {
1850 .trace = trace_raw_data,
1851 .raw = trace_raw_data,
1852};
1853
1854static struct trace_event trace_raw_data_event = {
1855 .type = TRACE_RAW_DATA,
1856 .funcs = &trace_raw_data_funcs,
1857};
1858
1859static enum print_line_t
1860trace_func_repeats_raw(struct trace_iterator *iter, int flags,
1861 struct trace_event *event)
1862{
1863 struct func_repeats_entry *field;
1864 struct trace_seq *s = &iter->seq;
1865
1866 trace_assign_type(field, iter->ent);
1867
1868 trace_seq_printf(s, "%lu %lu %u %llu\n",
1869 field->ip,
1870 field->parent_ip,
1871 field->count,
1872 FUNC_REPEATS_GET_DELTA_TS(field));
1873
1874 return trace_handle_return(s);
1875}
1876
1877static enum print_line_t
1878trace_func_repeats_print(struct trace_iterator *iter, int flags,
1879 struct trace_event *event)
1880{
1881 struct func_repeats_entry *field;
1882 struct trace_seq *s = &iter->seq;
1883
1884 trace_assign_type(field, iter->ent);
1885
1886 print_fn_trace(s, field->ip, field->parent_ip, NULL, iter->tr, flags);
1887 trace_seq_printf(s, " (repeats: %u, last_ts:", field->count);
1888 trace_print_time(s, iter,
1889 iter->ts - FUNC_REPEATS_GET_DELTA_TS(field));
1890 trace_seq_puts(s, ")\n");
1891
1892 return trace_handle_return(s);
1893}
1894
1895static struct trace_event_functions trace_func_repeats_funcs = {
1896 .trace = trace_func_repeats_print,
1897 .raw = trace_func_repeats_raw,
1898};
1899
1900static struct trace_event trace_func_repeats_event = {
1901 .type = TRACE_FUNC_REPEATS,
1902 .funcs = &trace_func_repeats_funcs,
1903};
1904
1905static struct trace_event *events[] __initdata = {
1906 &trace_fn_event,
1907 &trace_ctx_event,
1908 &trace_wake_event,
1909 &trace_stack_event,
1910 &trace_user_stack_event,
1911 &trace_bputs_event,
1912 &trace_bprint_event,
1913 &trace_print_event,
1914 &trace_hwlat_event,
1915 &trace_osnoise_event,
1916 &trace_timerlat_event,
1917 &trace_raw_data_event,
1918 &trace_func_repeats_event,
1919 NULL
1920};
1921
1922__init int init_events(void)
1923{
1924 struct trace_event *event;
1925 int i, ret;
1926
1927 for (i = 0; events[i]; i++) {
1928 event = events[i];
1929 ret = register_trace_event(event);
1930 WARN_ONCE(!ret, "event %d failed to register", event->type);
1931 }
1932
1933 return 0;
1934}