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TOMOYO Linux Cross Reference
Linux/kernel/trace/trace_output.c

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  1 /*
  2  * trace_output.c
  3  *
  4  * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
  5  *
  6  */
  7 #include <linux/module.h>
  8 #include <linux/mutex.h>
  9 #include <linux/ftrace.h>
 10 #include <linux/sched/clock.h>
 11 #include <linux/sched/mm.h>
 12 
 13 #include "trace_output.h"
 14 
 15 /* must be a power of 2 */
 16 #define EVENT_HASHSIZE  128
 17 
 18 DECLARE_RWSEM(trace_event_sem);
 19 
 20 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
 21 
 22 static int next_event_type = __TRACE_LAST_TYPE + 1;
 23 
 24 enum print_line_t trace_print_bputs_msg_only(struct trace_iterator *iter)
 25 {
 26         struct trace_seq *s = &iter->seq;
 27         struct trace_entry *entry = iter->ent;
 28         struct bputs_entry *field;
 29 
 30         trace_assign_type(field, entry);
 31 
 32         trace_seq_puts(s, field->str);
 33 
 34         return trace_handle_return(s);
 35 }
 36 
 37 enum print_line_t trace_print_bprintk_msg_only(struct trace_iterator *iter)
 38 {
 39         struct trace_seq *s = &iter->seq;
 40         struct trace_entry *entry = iter->ent;
 41         struct bprint_entry *field;
 42 
 43         trace_assign_type(field, entry);
 44 
 45         trace_seq_bprintf(s, field->fmt, field->buf);
 46 
 47         return trace_handle_return(s);
 48 }
 49 
 50 enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
 51 {
 52         struct trace_seq *s = &iter->seq;
 53         struct trace_entry *entry = iter->ent;
 54         struct print_entry *field;
 55 
 56         trace_assign_type(field, entry);
 57 
 58         trace_seq_puts(s, field->buf);
 59 
 60         return trace_handle_return(s);
 61 }
 62 
 63 const char *
 64 trace_print_flags_seq(struct trace_seq *p, const char *delim,
 65                       unsigned long flags,
 66                       const struct trace_print_flags *flag_array)
 67 {
 68         unsigned long mask;
 69         const char *str;
 70         const char *ret = trace_seq_buffer_ptr(p);
 71         int i, first = 1;
 72 
 73         for (i = 0;  flag_array[i].name && flags; i++) {
 74 
 75                 mask = flag_array[i].mask;
 76                 if ((flags & mask) != mask)
 77                         continue;
 78 
 79                 str = flag_array[i].name;
 80                 flags &= ~mask;
 81                 if (!first && delim)
 82                         trace_seq_puts(p, delim);
 83                 else
 84                         first = 0;
 85                 trace_seq_puts(p, str);
 86         }
 87 
 88         /* check for left over flags */
 89         if (flags) {
 90                 if (!first && delim)
 91                         trace_seq_puts(p, delim);
 92                 trace_seq_printf(p, "0x%lx", flags);
 93         }
 94 
 95         trace_seq_putc(p, 0);
 96 
 97         return ret;
 98 }
 99 EXPORT_SYMBOL(trace_print_flags_seq);
100 
101 const char *
102 trace_print_symbols_seq(struct trace_seq *p, unsigned long val,
103                         const struct trace_print_flags *symbol_array)
104 {
105         int i;
106         const char *ret = trace_seq_buffer_ptr(p);
107 
108         for (i = 0;  symbol_array[i].name; i++) {
109 
110                 if (val != symbol_array[i].mask)
111                         continue;
112 
113                 trace_seq_puts(p, symbol_array[i].name);
114                 break;
115         }
116 
117         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
118                 trace_seq_printf(p, "0x%lx", val);
119 
120         trace_seq_putc(p, 0);
121 
122         return ret;
123 }
124 EXPORT_SYMBOL(trace_print_symbols_seq);
125 
126 #if BITS_PER_LONG == 32
127 const char *
128 trace_print_flags_seq_u64(struct trace_seq *p, const char *delim,
129                       unsigned long long flags,
130                       const struct trace_print_flags_u64 *flag_array)
131 {
132         unsigned long long mask;
133         const char *str;
134         const char *ret = trace_seq_buffer_ptr(p);
135         int i, first = 1;
136 
137         for (i = 0;  flag_array[i].name && flags; i++) {
138 
139                 mask = flag_array[i].mask;
140                 if ((flags & mask) != mask)
141                         continue;
142 
143                 str = flag_array[i].name;
144                 flags &= ~mask;
145                 if (!first && delim)
146                         trace_seq_puts(p, delim);
147                 else
148                         first = 0;
149                 trace_seq_puts(p, str);
150         }
151 
152         /* check for left over flags */
153         if (flags) {
154                 if (!first && delim)
155                         trace_seq_puts(p, delim);
156                 trace_seq_printf(p, "0x%llx", flags);
157         }
158 
159         trace_seq_putc(p, 0);
160 
161         return ret;
162 }
163 EXPORT_SYMBOL(trace_print_flags_seq_u64);
164 
165 const char *
166 trace_print_symbols_seq_u64(struct trace_seq *p, unsigned long long val,
167                          const struct trace_print_flags_u64 *symbol_array)
168 {
169         int i;
170         const char *ret = trace_seq_buffer_ptr(p);
171 
172         for (i = 0;  symbol_array[i].name; i++) {
173 
174                 if (val != symbol_array[i].mask)
175                         continue;
176 
177                 trace_seq_puts(p, symbol_array[i].name);
178                 break;
179         }
180 
181         if (ret == (const char *)(trace_seq_buffer_ptr(p)))
182                 trace_seq_printf(p, "0x%llx", val);
183 
184         trace_seq_putc(p, 0);
185 
186         return ret;
187 }
188 EXPORT_SYMBOL(trace_print_symbols_seq_u64);
189 #endif
190 
191 const char *
192 trace_print_bitmask_seq(struct trace_seq *p, void *bitmask_ptr,
193                         unsigned int bitmask_size)
194 {
195         const char *ret = trace_seq_buffer_ptr(p);
196 
197         trace_seq_bitmask(p, bitmask_ptr, bitmask_size * 8);
198         trace_seq_putc(p, 0);
199 
200         return ret;
201 }
202 EXPORT_SYMBOL_GPL(trace_print_bitmask_seq);
203 
204 /**
205  * trace_print_hex_seq - print buffer as hex sequence
206  * @p: trace seq struct to write to
207  * @buf: The buffer to print
208  * @buf_len: Length of @buf in bytes
209  * @concatenate: Print @buf as single hex string or with spacing
210  *
211  * Prints the passed buffer as a hex sequence either as a whole,
212  * single hex string if @concatenate is true or with spacing after
213  * each byte in case @concatenate is false.
214  */
215 const char *
216 trace_print_hex_seq(struct trace_seq *p, const unsigned char *buf, int buf_len,
217                     bool concatenate)
218 {
219         int i;
220         const char *ret = trace_seq_buffer_ptr(p);
221 
222         for (i = 0; i < buf_len; i++)
223                 trace_seq_printf(p, "%s%2.2x", concatenate || i == 0 ? "" : " ",
224                                  buf[i]);
225         trace_seq_putc(p, 0);
226 
227         return ret;
228 }
229 EXPORT_SYMBOL(trace_print_hex_seq);
230 
231 const char *
232 trace_print_array_seq(struct trace_seq *p, const void *buf, int count,
233                       size_t el_size)
234 {
235         const char *ret = trace_seq_buffer_ptr(p);
236         const char *prefix = "";
237         void *ptr = (void *)buf;
238         size_t buf_len = count * el_size;
239 
240         trace_seq_putc(p, '{');
241 
242         while (ptr < buf + buf_len) {
243                 switch (el_size) {
244                 case 1:
245                         trace_seq_printf(p, "%s0x%x", prefix,
246                                          *(u8 *)ptr);
247                         break;
248                 case 2:
249                         trace_seq_printf(p, "%s0x%x", prefix,
250                                          *(u16 *)ptr);
251                         break;
252                 case 4:
253                         trace_seq_printf(p, "%s0x%x", prefix,
254                                          *(u32 *)ptr);
255                         break;
256                 case 8:
257                         trace_seq_printf(p, "%s0x%llx", prefix,
258                                          *(u64 *)ptr);
259                         break;
260                 default:
261                         trace_seq_printf(p, "BAD SIZE:%zu 0x%x", el_size,
262                                          *(u8 *)ptr);
263                         el_size = 1;
264                 }
265                 prefix = ",";
266                 ptr += el_size;
267         }
268 
269         trace_seq_putc(p, '}');
270         trace_seq_putc(p, 0);
271 
272         return ret;
273 }
274 EXPORT_SYMBOL(trace_print_array_seq);
275 
276 int trace_raw_output_prep(struct trace_iterator *iter,
277                           struct trace_event *trace_event)
278 {
279         struct trace_event_call *event;
280         struct trace_seq *s = &iter->seq;
281         struct trace_seq *p = &iter->tmp_seq;
282         struct trace_entry *entry;
283 
284         event = container_of(trace_event, struct trace_event_call, event);
285         entry = iter->ent;
286 
287         if (entry->type != event->event.type) {
288                 WARN_ON_ONCE(1);
289                 return TRACE_TYPE_UNHANDLED;
290         }
291 
292         trace_seq_init(p);
293         trace_seq_printf(s, "%s: ", trace_event_name(event));
294 
295         return trace_handle_return(s);
296 }
297 EXPORT_SYMBOL(trace_raw_output_prep);
298 
299 static int trace_output_raw(struct trace_iterator *iter, char *name,
300                             char *fmt, va_list ap)
301 {
302         struct trace_seq *s = &iter->seq;
303 
304         trace_seq_printf(s, "%s: ", name);
305         trace_seq_vprintf(s, fmt, ap);
306 
307         return trace_handle_return(s);
308 }
309 
310 int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...)
311 {
312         va_list ap;
313         int ret;
314 
315         va_start(ap, fmt);
316         ret = trace_output_raw(iter, name, fmt, ap);
317         va_end(ap);
318 
319         return ret;
320 }
321 EXPORT_SYMBOL_GPL(trace_output_call);
322 
323 #ifdef CONFIG_KRETPROBES
324 static inline const char *kretprobed(const char *name)
325 {
326         static const char tramp_name[] = "kretprobe_trampoline";
327         int size = sizeof(tramp_name);
328 
329         if (strncmp(tramp_name, name, size) == 0)
330                 return "[unknown/kretprobe'd]";
331         return name;
332 }
333 #else
334 static inline const char *kretprobed(const char *name)
335 {
336         return name;
337 }
338 #endif /* CONFIG_KRETPROBES */
339 
340 static void
341 seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
342 {
343         char str[KSYM_SYMBOL_LEN];
344 #ifdef CONFIG_KALLSYMS
345         const char *name;
346 
347         kallsyms_lookup(address, NULL, NULL, NULL, str);
348 
349         name = kretprobed(str);
350 
351         if (name && strlen(name)) {
352                 trace_seq_printf(s, fmt, name);
353                 return;
354         }
355 #endif
356         snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
357         trace_seq_printf(s, fmt, str);
358 }
359 
360 static void
361 seq_print_sym_offset(struct trace_seq *s, const char *fmt,
362                      unsigned long address)
363 {
364         char str[KSYM_SYMBOL_LEN];
365 #ifdef CONFIG_KALLSYMS
366         const char *name;
367 
368         sprint_symbol(str, address);
369         name = kretprobed(str);
370 
371         if (name && strlen(name)) {
372                 trace_seq_printf(s, fmt, name);
373                 return;
374         }
375 #endif
376         snprintf(str, KSYM_SYMBOL_LEN, "0x%08lx", address);
377         trace_seq_printf(s, fmt, str);
378 }
379 
380 #ifndef CONFIG_64BIT
381 # define IP_FMT "%08lx"
382 #else
383 # define IP_FMT "%016lx"
384 #endif
385 
386 static int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
387                              unsigned long ip, unsigned long sym_flags)
388 {
389         struct file *file = NULL;
390         unsigned long vmstart = 0;
391         int ret = 1;
392 
393         if (s->full)
394                 return 0;
395 
396         if (mm) {
397                 const struct vm_area_struct *vma;
398 
399                 down_read(&mm->mmap_sem);
400                 vma = find_vma(mm, ip);
401                 if (vma) {
402                         file = vma->vm_file;
403                         vmstart = vma->vm_start;
404                 }
405                 if (file) {
406                         ret = trace_seq_path(s, &file->f_path);
407                         if (ret)
408                                 trace_seq_printf(s, "[+0x%lx]",
409                                                  ip - vmstart);
410                 }
411                 up_read(&mm->mmap_sem);
412         }
413         if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
414                 trace_seq_printf(s, " <" IP_FMT ">", ip);
415         return !trace_seq_has_overflowed(s);
416 }
417 
418 int
419 seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
420 {
421         if (!ip) {
422                 trace_seq_putc(s, '');
423                 goto out;
424         }
425 
426         if (sym_flags & TRACE_ITER_SYM_OFFSET)
427                 seq_print_sym_offset(s, "%s", ip);
428         else
429                 seq_print_sym_short(s, "%s", ip);
430 
431         if (sym_flags & TRACE_ITER_SYM_ADDR)
432                 trace_seq_printf(s, " <" IP_FMT ">", ip);
433 
434  out:
435         return !trace_seq_has_overflowed(s);
436 }
437 
438 /**
439  * trace_print_lat_fmt - print the irq, preempt and lockdep fields
440  * @s: trace seq struct to write to
441  * @entry: The trace entry field from the ring buffer
442  *
443  * Prints the generic fields of irqs off, in hard or softirq, preempt
444  * count.
445  */
446 int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
447 {
448         char hardsoft_irq;
449         char need_resched;
450         char irqs_off;
451         int hardirq;
452         int softirq;
453         int nmi;
454 
455         nmi = entry->flags & TRACE_FLAG_NMI;
456         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
457         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
458 
459         irqs_off =
460                 (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
461                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ? 'X' :
462                 '.';
463 
464         switch (entry->flags & (TRACE_FLAG_NEED_RESCHED |
465                                 TRACE_FLAG_PREEMPT_RESCHED)) {
466         case TRACE_FLAG_NEED_RESCHED | TRACE_FLAG_PREEMPT_RESCHED:
467                 need_resched = 'N';
468                 break;
469         case TRACE_FLAG_NEED_RESCHED:
470                 need_resched = 'n';
471                 break;
472         case TRACE_FLAG_PREEMPT_RESCHED:
473                 need_resched = 'p';
474                 break;
475         default:
476                 need_resched = '.';
477                 break;
478         }
479 
480         hardsoft_irq =
481                 (nmi && hardirq)     ? 'Z' :
482                 nmi                  ? 'z' :
483                 (hardirq && softirq) ? 'H' :
484                 hardirq              ? 'h' :
485                 softirq              ? 's' :
486                                        '.' ;
487 
488         trace_seq_printf(s, "%c%c%c",
489                          irqs_off, need_resched, hardsoft_irq);
490 
491         if (entry->preempt_count)
492                 trace_seq_printf(s, "%x", entry->preempt_count);
493         else
494                 trace_seq_putc(s, '.');
495 
496         return !trace_seq_has_overflowed(s);
497 }
498 
499 static int
500 lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
501 {
502         char comm[TASK_COMM_LEN];
503 
504         trace_find_cmdline(entry->pid, comm);
505 
506         trace_seq_printf(s, "%8.8s-%-5d %3d",
507                          comm, entry->pid, cpu);
508 
509         return trace_print_lat_fmt(s, entry);
510 }
511 
512 #undef MARK
513 #define MARK(v, s) {.val = v, .sym = s}
514 /* trace overhead mark */
515 static const struct trace_mark {
516         unsigned long long      val; /* unit: nsec */
517         char                    sym;
518 } mark[] = {
519         MARK(1000000000ULL      , '$'), /* 1 sec */
520         MARK(100000000ULL       , '@'), /* 100 msec */
521         MARK(10000000ULL        , '*'), /* 10 msec */
522         MARK(1000000ULL         , '#'), /* 1000 usecs */
523         MARK(100000ULL          , '!'), /* 100 usecs */
524         MARK(10000ULL           , '+'), /* 10 usecs */
525 };
526 #undef MARK
527 
528 char trace_find_mark(unsigned long long d)
529 {
530         int i;
531         int size = ARRAY_SIZE(mark);
532 
533         for (i = 0; i < size; i++) {
534                 if (d > mark[i].val)
535                         break;
536         }
537 
538         return (i == size) ? ' ' : mark[i].sym;
539 }
540 
541 static int
542 lat_print_timestamp(struct trace_iterator *iter, u64 next_ts)
543 {
544         struct trace_array *tr = iter->tr;
545         unsigned long verbose = tr->trace_flags & TRACE_ITER_VERBOSE;
546         unsigned long in_ns = iter->iter_flags & TRACE_FILE_TIME_IN_NS;
547         unsigned long long abs_ts = iter->ts - iter->trace_buffer->time_start;
548         unsigned long long rel_ts = next_ts - iter->ts;
549         struct trace_seq *s = &iter->seq;
550 
551         if (in_ns) {
552                 abs_ts = ns2usecs(abs_ts);
553                 rel_ts = ns2usecs(rel_ts);
554         }
555 
556         if (verbose && in_ns) {
557                 unsigned long abs_usec = do_div(abs_ts, USEC_PER_MSEC);
558                 unsigned long abs_msec = (unsigned long)abs_ts;
559                 unsigned long rel_usec = do_div(rel_ts, USEC_PER_MSEC);
560                 unsigned long rel_msec = (unsigned long)rel_ts;
561 
562                 trace_seq_printf(
563                         s, "[%08llx] %ld.%03ldms (+%ld.%03ldms): ",
564                         ns2usecs(iter->ts),
565                         abs_msec, abs_usec,
566                         rel_msec, rel_usec);
567 
568         } else if (verbose && !in_ns) {
569                 trace_seq_printf(
570                         s, "[%016llx] %lld (+%lld): ",
571                         iter->ts, abs_ts, rel_ts);
572 
573         } else if (!verbose && in_ns) {
574                 trace_seq_printf(
575                         s, " %4lldus%c: ",
576                         abs_ts,
577                         trace_find_mark(rel_ts * NSEC_PER_USEC));
578 
579         } else { /* !verbose && !in_ns */
580                 trace_seq_printf(s, " %4lld: ", abs_ts);
581         }
582 
583         return !trace_seq_has_overflowed(s);
584 }
585 
586 int trace_print_context(struct trace_iterator *iter)
587 {
588         struct trace_array *tr = iter->tr;
589         struct trace_seq *s = &iter->seq;
590         struct trace_entry *entry = iter->ent;
591         unsigned long long t;
592         unsigned long secs, usec_rem;
593         char comm[TASK_COMM_LEN];
594 
595         trace_find_cmdline(entry->pid, comm);
596 
597         trace_seq_printf(s, "%16s-%-5d [%03d] ",
598                                comm, entry->pid, iter->cpu);
599 
600         if (tr->trace_flags & TRACE_ITER_RECORD_TGID) {
601                 unsigned int tgid = trace_find_tgid(entry->pid);
602 
603                 if (!tgid)
604                         trace_seq_printf(s, "(-----) ");
605                 else
606                         trace_seq_printf(s, "(%5d) ", tgid);
607         }
608 
609         if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
610                 trace_print_lat_fmt(s, entry);
611 
612         if (iter->iter_flags & TRACE_FILE_TIME_IN_NS) {
613                 t = ns2usecs(iter->ts);
614                 usec_rem = do_div(t, USEC_PER_SEC);
615                 secs = (unsigned long)t;
616                 trace_seq_printf(s, " %5lu.%06lu: ", secs, usec_rem);
617         } else
618                 trace_seq_printf(s, " %12llu: ", iter->ts);
619 
620         return !trace_seq_has_overflowed(s);
621 }
622 
623 int trace_print_lat_context(struct trace_iterator *iter)
624 {
625         struct trace_array *tr = iter->tr;
626         /* trace_find_next_entry will reset ent_size */
627         int ent_size = iter->ent_size;
628         struct trace_seq *s = &iter->seq;
629         u64 next_ts;
630         struct trace_entry *entry = iter->ent,
631                            *next_entry = trace_find_next_entry(iter, NULL,
632                                                                &next_ts);
633         unsigned long verbose = (tr->trace_flags & TRACE_ITER_VERBOSE);
634 
635         /* Restore the original ent_size */
636         iter->ent_size = ent_size;
637 
638         if (!next_entry)
639                 next_ts = iter->ts;
640 
641         if (verbose) {
642                 char comm[TASK_COMM_LEN];
643 
644                 trace_find_cmdline(entry->pid, comm);
645 
646                 trace_seq_printf(
647                         s, "%16s %5d %3d %d %08x %08lx ",
648                         comm, entry->pid, iter->cpu, entry->flags,
649                         entry->preempt_count, iter->idx);
650         } else {
651                 lat_print_generic(s, entry, iter->cpu);
652         }
653 
654         lat_print_timestamp(iter, next_ts);
655 
656         return !trace_seq_has_overflowed(s);
657 }
658 
659 /**
660  * ftrace_find_event - find a registered event
661  * @type: the type of event to look for
662  *
663  * Returns an event of type @type otherwise NULL
664  * Called with trace_event_read_lock() held.
665  */
666 struct trace_event *ftrace_find_event(int type)
667 {
668         struct trace_event *event;
669         unsigned key;
670 
671         key = type & (EVENT_HASHSIZE - 1);
672 
673         hlist_for_each_entry(event, &event_hash[key], node) {
674                 if (event->type == type)
675                         return event;
676         }
677 
678         return NULL;
679 }
680 
681 static LIST_HEAD(ftrace_event_list);
682 
683 static int trace_search_list(struct list_head **list)
684 {
685         struct trace_event *e;
686         int last = __TRACE_LAST_TYPE;
687 
688         if (list_empty(&ftrace_event_list)) {
689                 *list = &ftrace_event_list;
690                 return last + 1;
691         }
692 
693         /*
694          * We used up all possible max events,
695          * lets see if somebody freed one.
696          */
697         list_for_each_entry(e, &ftrace_event_list, list) {
698                 if (e->type != last + 1)
699                         break;
700                 last++;
701         }
702 
703         /* Did we used up all 65 thousand events??? */
704         if ((last + 1) > TRACE_EVENT_TYPE_MAX)
705                 return 0;
706 
707         *list = &e->list;
708         return last + 1;
709 }
710 
711 void trace_event_read_lock(void)
712 {
713         down_read(&trace_event_sem);
714 }
715 
716 void trace_event_read_unlock(void)
717 {
718         up_read(&trace_event_sem);
719 }
720 
721 /**
722  * register_trace_event - register output for an event type
723  * @event: the event type to register
724  *
725  * Event types are stored in a hash and this hash is used to
726  * find a way to print an event. If the @event->type is set
727  * then it will use that type, otherwise it will assign a
728  * type to use.
729  *
730  * If you assign your own type, please make sure it is added
731  * to the trace_type enum in trace.h, to avoid collisions
732  * with the dynamic types.
733  *
734  * Returns the event type number or zero on error.
735  */
736 int register_trace_event(struct trace_event *event)
737 {
738         unsigned key;
739         int ret = 0;
740 
741         down_write(&trace_event_sem);
742 
743         if (WARN_ON(!event))
744                 goto out;
745 
746         if (WARN_ON(!event->funcs))
747                 goto out;
748 
749         INIT_LIST_HEAD(&event->list);
750 
751         if (!event->type) {
752                 struct list_head *list = NULL;
753 
754                 if (next_event_type > TRACE_EVENT_TYPE_MAX) {
755 
756                         event->type = trace_search_list(&list);
757                         if (!event->type)
758                                 goto out;
759 
760                 } else {
761 
762                         event->type = next_event_type++;
763                         list = &ftrace_event_list;
764                 }
765 
766                 if (WARN_ON(ftrace_find_event(event->type)))
767                         goto out;
768 
769                 list_add_tail(&event->list, list);
770 
771         } else if (event->type > __TRACE_LAST_TYPE) {
772                 printk(KERN_WARNING "Need to add type to trace.h\n");
773                 WARN_ON(1);
774                 goto out;
775         } else {
776                 /* Is this event already used */
777                 if (ftrace_find_event(event->type))
778                         goto out;
779         }
780 
781         if (event->funcs->trace == NULL)
782                 event->funcs->trace = trace_nop_print;
783         if (event->funcs->raw == NULL)
784                 event->funcs->raw = trace_nop_print;
785         if (event->funcs->hex == NULL)
786                 event->funcs->hex = trace_nop_print;
787         if (event->funcs->binary == NULL)
788                 event->funcs->binary = trace_nop_print;
789 
790         key = event->type & (EVENT_HASHSIZE - 1);
791 
792         hlist_add_head(&event->node, &event_hash[key]);
793 
794         ret = event->type;
795  out:
796         up_write(&trace_event_sem);
797 
798         return ret;
799 }
800 EXPORT_SYMBOL_GPL(register_trace_event);
801 
802 /*
803  * Used by module code with the trace_event_sem held for write.
804  */
805 int __unregister_trace_event(struct trace_event *event)
806 {
807         hlist_del(&event->node);
808         list_del(&event->list);
809         return 0;
810 }
811 
812 /**
813  * unregister_trace_event - remove a no longer used event
814  * @event: the event to remove
815  */
816 int unregister_trace_event(struct trace_event *event)
817 {
818         down_write(&trace_event_sem);
819         __unregister_trace_event(event);
820         up_write(&trace_event_sem);
821 
822         return 0;
823 }
824 EXPORT_SYMBOL_GPL(unregister_trace_event);
825 
826 /*
827  * Standard events
828  */
829 
830 enum print_line_t trace_nop_print(struct trace_iterator *iter, int flags,
831                                   struct trace_event *event)
832 {
833         trace_seq_printf(&iter->seq, "type: %d\n", iter->ent->type);
834 
835         return trace_handle_return(&iter->seq);
836 }
837 
838 /* TRACE_FN */
839 static enum print_line_t trace_fn_trace(struct trace_iterator *iter, int flags,
840                                         struct trace_event *event)
841 {
842         struct ftrace_entry *field;
843         struct trace_seq *s = &iter->seq;
844 
845         trace_assign_type(field, iter->ent);
846 
847         seq_print_ip_sym(s, field->ip, flags);
848 
849         if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
850                 trace_seq_puts(s, " <-");
851                 seq_print_ip_sym(s, field->parent_ip, flags);
852         }
853 
854         trace_seq_putc(s, '\n');
855 
856         return trace_handle_return(s);
857 }
858 
859 static enum print_line_t trace_fn_raw(struct trace_iterator *iter, int flags,
860                                       struct trace_event *event)
861 {
862         struct ftrace_entry *field;
863 
864         trace_assign_type(field, iter->ent);
865 
866         trace_seq_printf(&iter->seq, "%lx %lx\n",
867                          field->ip,
868                          field->parent_ip);
869 
870         return trace_handle_return(&iter->seq);
871 }
872 
873 static enum print_line_t trace_fn_hex(struct trace_iterator *iter, int flags,
874                                       struct trace_event *event)
875 {
876         struct ftrace_entry *field;
877         struct trace_seq *s = &iter->seq;
878 
879         trace_assign_type(field, iter->ent);
880 
881         SEQ_PUT_HEX_FIELD(s, field->ip);
882         SEQ_PUT_HEX_FIELD(s, field->parent_ip);
883 
884         return trace_handle_return(s);
885 }
886 
887 static enum print_line_t trace_fn_bin(struct trace_iterator *iter, int flags,
888                                       struct trace_event *event)
889 {
890         struct ftrace_entry *field;
891         struct trace_seq *s = &iter->seq;
892 
893         trace_assign_type(field, iter->ent);
894 
895         SEQ_PUT_FIELD(s, field->ip);
896         SEQ_PUT_FIELD(s, field->parent_ip);
897 
898         return trace_handle_return(s);
899 }
900 
901 static struct trace_event_functions trace_fn_funcs = {
902         .trace          = trace_fn_trace,
903         .raw            = trace_fn_raw,
904         .hex            = trace_fn_hex,
905         .binary         = trace_fn_bin,
906 };
907 
908 static struct trace_event trace_fn_event = {
909         .type           = TRACE_FN,
910         .funcs          = &trace_fn_funcs,
911 };
912 
913 /* TRACE_CTX an TRACE_WAKE */
914 static enum print_line_t trace_ctxwake_print(struct trace_iterator *iter,
915                                              char *delim)
916 {
917         struct ctx_switch_entry *field;
918         char comm[TASK_COMM_LEN];
919         int S, T;
920 
921 
922         trace_assign_type(field, iter->ent);
923 
924         T = task_index_to_char(field->next_state);
925         S = task_index_to_char(field->prev_state);
926         trace_find_cmdline(field->next_pid, comm);
927         trace_seq_printf(&iter->seq,
928                          " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
929                          field->prev_pid,
930                          field->prev_prio,
931                          S, delim,
932                          field->next_cpu,
933                          field->next_pid,
934                          field->next_prio,
935                          T, comm);
936 
937         return trace_handle_return(&iter->seq);
938 }
939 
940 static enum print_line_t trace_ctx_print(struct trace_iterator *iter, int flags,
941                                          struct trace_event *event)
942 {
943         return trace_ctxwake_print(iter, "==>");
944 }
945 
946 static enum print_line_t trace_wake_print(struct trace_iterator *iter,
947                                           int flags, struct trace_event *event)
948 {
949         return trace_ctxwake_print(iter, "  +");
950 }
951 
952 static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
953 {
954         struct ctx_switch_entry *field;
955         int T;
956 
957         trace_assign_type(field, iter->ent);
958 
959         if (!S)
960                 S = task_index_to_char(field->prev_state);
961         T = task_index_to_char(field->next_state);
962         trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
963                          field->prev_pid,
964                          field->prev_prio,
965                          S,
966                          field->next_cpu,
967                          field->next_pid,
968                          field->next_prio,
969                          T);
970 
971         return trace_handle_return(&iter->seq);
972 }
973 
974 static enum print_line_t trace_ctx_raw(struct trace_iterator *iter, int flags,
975                                        struct trace_event *event)
976 {
977         return trace_ctxwake_raw(iter, 0);
978 }
979 
980 static enum print_line_t trace_wake_raw(struct trace_iterator *iter, int flags,
981                                         struct trace_event *event)
982 {
983         return trace_ctxwake_raw(iter, '+');
984 }
985 
986 
987 static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
988 {
989         struct ctx_switch_entry *field;
990         struct trace_seq *s = &iter->seq;
991         int T;
992 
993         trace_assign_type(field, iter->ent);
994 
995         if (!S)
996                 S = task_index_to_char(field->prev_state);
997         T = task_index_to_char(field->next_state);
998 
999         SEQ_PUT_HEX_FIELD(s, field->prev_pid);
1000         SEQ_PUT_HEX_FIELD(s, field->prev_prio);
1001         SEQ_PUT_HEX_FIELD(s, S);
1002         SEQ_PUT_HEX_FIELD(s, field->next_cpu);
1003         SEQ_PUT_HEX_FIELD(s, field->next_pid);
1004         SEQ_PUT_HEX_FIELD(s, field->next_prio);
1005         SEQ_PUT_HEX_FIELD(s, T);
1006 
1007         return trace_handle_return(s);
1008 }
1009 
1010 static enum print_line_t trace_ctx_hex(struct trace_iterator *iter, int flags,
1011                                        struct trace_event *event)
1012 {
1013         return trace_ctxwake_hex(iter, 0);
1014 }
1015 
1016 static enum print_line_t trace_wake_hex(struct trace_iterator *iter, int flags,
1017                                         struct trace_event *event)
1018 {
1019         return trace_ctxwake_hex(iter, '+');
1020 }
1021 
1022 static enum print_line_t trace_ctxwake_bin(struct trace_iterator *iter,
1023                                            int flags, struct trace_event *event)
1024 {
1025         struct ctx_switch_entry *field;
1026         struct trace_seq *s = &iter->seq;
1027 
1028         trace_assign_type(field, iter->ent);
1029 
1030         SEQ_PUT_FIELD(s, field->prev_pid);
1031         SEQ_PUT_FIELD(s, field->prev_prio);
1032         SEQ_PUT_FIELD(s, field->prev_state);
1033         SEQ_PUT_FIELD(s, field->next_cpu);
1034         SEQ_PUT_FIELD(s, field->next_pid);
1035         SEQ_PUT_FIELD(s, field->next_prio);
1036         SEQ_PUT_FIELD(s, field->next_state);
1037 
1038         return trace_handle_return(s);
1039 }
1040 
1041 static struct trace_event_functions trace_ctx_funcs = {
1042         .trace          = trace_ctx_print,
1043         .raw            = trace_ctx_raw,
1044         .hex            = trace_ctx_hex,
1045         .binary         = trace_ctxwake_bin,
1046 };
1047 
1048 static struct trace_event trace_ctx_event = {
1049         .type           = TRACE_CTX,
1050         .funcs          = &trace_ctx_funcs,
1051 };
1052 
1053 static struct trace_event_functions trace_wake_funcs = {
1054         .trace          = trace_wake_print,
1055         .raw            = trace_wake_raw,
1056         .hex            = trace_wake_hex,
1057         .binary         = trace_ctxwake_bin,
1058 };
1059 
1060 static struct trace_event trace_wake_event = {
1061         .type           = TRACE_WAKE,
1062         .funcs          = &trace_wake_funcs,
1063 };
1064 
1065 /* TRACE_STACK */
1066 
1067 static enum print_line_t trace_stack_print(struct trace_iterator *iter,
1068                                            int flags, struct trace_event *event)
1069 {
1070         struct stack_entry *field;
1071         struct trace_seq *s = &iter->seq;
1072         unsigned long *p;
1073         unsigned long *end;
1074 
1075         trace_assign_type(field, iter->ent);
1076         end = (unsigned long *)((long)iter->ent + iter->ent_size);
1077 
1078         trace_seq_puts(s, "<stack trace>\n");
1079 
1080         for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {
1081 
1082                 if (trace_seq_has_overflowed(s))
1083                         break;
1084 
1085                 trace_seq_puts(s, " => ");
1086                 seq_print_ip_sym(s, *p, flags);
1087                 trace_seq_putc(s, '\n');
1088         }
1089 
1090         return trace_handle_return(s);
1091 }
1092 
1093 static struct trace_event_functions trace_stack_funcs = {
1094         .trace          = trace_stack_print,
1095 };
1096 
1097 static struct trace_event trace_stack_event = {
1098         .type           = TRACE_STACK,
1099         .funcs          = &trace_stack_funcs,
1100 };
1101 
1102 /* TRACE_USER_STACK */
1103 static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
1104                                                 int flags, struct trace_event *event)
1105 {
1106         struct trace_array *tr = iter->tr;
1107         struct userstack_entry *field;
1108         struct trace_seq *s = &iter->seq;
1109         struct mm_struct *mm = NULL;
1110         unsigned int i;
1111 
1112         trace_assign_type(field, iter->ent);
1113 
1114         trace_seq_puts(s, "<user stack trace>\n");
1115 
1116         if (tr->trace_flags & TRACE_ITER_SYM_USEROBJ) {
1117                 struct task_struct *task;
1118                 /*
1119                  * we do the lookup on the thread group leader,
1120                  * since individual threads might have already quit!
1121                  */
1122                 rcu_read_lock();
1123                 task = find_task_by_vpid(field->tgid);
1124                 if (task)
1125                         mm = get_task_mm(task);
1126                 rcu_read_unlock();
1127         }
1128 
1129         for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
1130                 unsigned long ip = field->caller[i];
1131 
1132                 if (ip == ULONG_MAX || trace_seq_has_overflowed(s))
1133                         break;
1134 
1135                 trace_seq_puts(s, " => ");
1136 
1137                 if (!ip) {
1138                         trace_seq_puts(s, "??");
1139                         trace_seq_putc(s, '\n');
1140                         continue;
1141                 }
1142 
1143                 seq_print_user_ip(s, mm, ip, flags);
1144                 trace_seq_putc(s, '\n');
1145         }
1146 
1147         if (mm)
1148                 mmput(mm);
1149 
1150         return trace_handle_return(s);
1151 }
1152 
1153 static struct trace_event_functions trace_user_stack_funcs = {
1154         .trace          = trace_user_stack_print,
1155 };
1156 
1157 static struct trace_event trace_user_stack_event = {
1158         .type           = TRACE_USER_STACK,
1159         .funcs          = &trace_user_stack_funcs,
1160 };
1161 
1162 /* TRACE_HWLAT */
1163 static enum print_line_t
1164 trace_hwlat_print(struct trace_iterator *iter, int flags,
1165                   struct trace_event *event)
1166 {
1167         struct trace_entry *entry = iter->ent;
1168         struct trace_seq *s = &iter->seq;
1169         struct hwlat_entry *field;
1170 
1171         trace_assign_type(field, entry);
1172 
1173         trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
1174                          field->seqnum,
1175                          field->duration,
1176                          field->outer_duration,
1177                          (long long)field->timestamp.tv_sec,
1178                          field->timestamp.tv_nsec);
1179 
1180         if (field->nmi_count) {
1181                 /*
1182                  * The generic sched_clock() is not NMI safe, thus
1183                  * we only record the count and not the time.
1184                  */
1185                 if (!IS_ENABLED(CONFIG_GENERIC_SCHED_CLOCK))
1186                         trace_seq_printf(s, " nmi-total:%llu",
1187                                          field->nmi_total_ts);
1188                 trace_seq_printf(s, " nmi-count:%u",
1189                                  field->nmi_count);
1190         }
1191 
1192         trace_seq_putc(s, '\n');
1193 
1194         return trace_handle_return(s);
1195 }
1196 
1197 
1198 static enum print_line_t
1199 trace_hwlat_raw(struct trace_iterator *iter, int flags,
1200                 struct trace_event *event)
1201 {
1202         struct hwlat_entry *field;
1203         struct trace_seq *s = &iter->seq;
1204 
1205         trace_assign_type(field, iter->ent);
1206 
1207         trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
1208                          field->duration,
1209                          field->outer_duration,
1210                          (long long)field->timestamp.tv_sec,
1211                          field->timestamp.tv_nsec,
1212                          field->seqnum);
1213 
1214         return trace_handle_return(s);
1215 }
1216 
1217 static struct trace_event_functions trace_hwlat_funcs = {
1218         .trace          = trace_hwlat_print,
1219         .raw            = trace_hwlat_raw,
1220 };
1221 
1222 static struct trace_event trace_hwlat_event = {
1223         .type           = TRACE_HWLAT,
1224         .funcs          = &trace_hwlat_funcs,
1225 };
1226 
1227 /* TRACE_BPUTS */
1228 static enum print_line_t
1229 trace_bputs_print(struct trace_iterator *iter, int flags,
1230                    struct trace_event *event)
1231 {
1232         struct trace_entry *entry = iter->ent;
1233         struct trace_seq *s = &iter->seq;
1234         struct bputs_entry *field;
1235 
1236         trace_assign_type(field, entry);
1237 
1238         seq_print_ip_sym(s, field->ip, flags);
1239         trace_seq_puts(s, ": ");
1240         trace_seq_puts(s, field->str);
1241 
1242         return trace_handle_return(s);
1243 }
1244 
1245 
1246 static enum print_line_t
1247 trace_bputs_raw(struct trace_iterator *iter, int flags,
1248                 struct trace_event *event)
1249 {
1250         struct bputs_entry *field;
1251         struct trace_seq *s = &iter->seq;
1252 
1253         trace_assign_type(field, iter->ent);
1254 
1255         trace_seq_printf(s, ": %lx : ", field->ip);
1256         trace_seq_puts(s, field->str);
1257 
1258         return trace_handle_return(s);
1259 }
1260 
1261 static struct trace_event_functions trace_bputs_funcs = {
1262         .trace          = trace_bputs_print,
1263         .raw            = trace_bputs_raw,
1264 };
1265 
1266 static struct trace_event trace_bputs_event = {
1267         .type           = TRACE_BPUTS,
1268         .funcs          = &trace_bputs_funcs,
1269 };
1270 
1271 /* TRACE_BPRINT */
1272 static enum print_line_t
1273 trace_bprint_print(struct trace_iterator *iter, int flags,
1274                    struct trace_event *event)
1275 {
1276         struct trace_entry *entry = iter->ent;
1277         struct trace_seq *s = &iter->seq;
1278         struct bprint_entry *field;
1279 
1280         trace_assign_type(field, entry);
1281 
1282         seq_print_ip_sym(s, field->ip, flags);
1283         trace_seq_puts(s, ": ");
1284         trace_seq_bprintf(s, field->fmt, field->buf);
1285 
1286         return trace_handle_return(s);
1287 }
1288 
1289 
1290 static enum print_line_t
1291 trace_bprint_raw(struct trace_iterator *iter, int flags,
1292                  struct trace_event *event)
1293 {
1294         struct bprint_entry *field;
1295         struct trace_seq *s = &iter->seq;
1296 
1297         trace_assign_type(field, iter->ent);
1298 
1299         trace_seq_printf(s, ": %lx : ", field->ip);
1300         trace_seq_bprintf(s, field->fmt, field->buf);
1301 
1302         return trace_handle_return(s);
1303 }
1304 
1305 static struct trace_event_functions trace_bprint_funcs = {
1306         .trace          = trace_bprint_print,
1307         .raw            = trace_bprint_raw,
1308 };
1309 
1310 static struct trace_event trace_bprint_event = {
1311         .type           = TRACE_BPRINT,
1312         .funcs          = &trace_bprint_funcs,
1313 };
1314 
1315 /* TRACE_PRINT */
1316 static enum print_line_t trace_print_print(struct trace_iterator *iter,
1317                                            int flags, struct trace_event *event)
1318 {
1319         struct print_entry *field;
1320         struct trace_seq *s = &iter->seq;
1321 
1322         trace_assign_type(field, iter->ent);
1323 
1324         seq_print_ip_sym(s, field->ip, flags);
1325         trace_seq_printf(s, ": %s", field->buf);
1326 
1327         return trace_handle_return(s);
1328 }
1329 
1330 static enum print_line_t trace_print_raw(struct trace_iterator *iter, int flags,
1331                                          struct trace_event *event)
1332 {
1333         struct print_entry *field;
1334 
1335         trace_assign_type(field, iter->ent);
1336 
1337         trace_seq_printf(&iter->seq, "# %lx %s", field->ip, field->buf);
1338 
1339         return trace_handle_return(&iter->seq);
1340 }
1341 
1342 static struct trace_event_functions trace_print_funcs = {
1343         .trace          = trace_print_print,
1344         .raw            = trace_print_raw,
1345 };
1346 
1347 static struct trace_event trace_print_event = {
1348         .type           = TRACE_PRINT,
1349         .funcs          = &trace_print_funcs,
1350 };
1351 
1352 static enum print_line_t trace_raw_data(struct trace_iterator *iter, int flags,
1353                                          struct trace_event *event)
1354 {
1355         struct raw_data_entry *field;
1356         int i;
1357 
1358         trace_assign_type(field, iter->ent);
1359 
1360         trace_seq_printf(&iter->seq, "# %x buf:", field->id);
1361 
1362         for (i = 0; i < iter->ent_size - offsetof(struct raw_data_entry, buf); i++)
1363                 trace_seq_printf(&iter->seq, " %02x",
1364                                  (unsigned char)field->buf[i]);
1365 
1366         trace_seq_putc(&iter->seq, '\n');
1367 
1368         return trace_handle_return(&iter->seq);
1369 }
1370 
1371 static struct trace_event_functions trace_raw_data_funcs = {
1372         .trace          = trace_raw_data,
1373         .raw            = trace_raw_data,
1374 };
1375 
1376 static struct trace_event trace_raw_data_event = {
1377         .type           = TRACE_RAW_DATA,
1378         .funcs          = &trace_raw_data_funcs,
1379 };
1380 
1381 
1382 static struct trace_event *events[] __initdata = {
1383         &trace_fn_event,
1384         &trace_ctx_event,
1385         &trace_wake_event,
1386         &trace_stack_event,
1387         &trace_user_stack_event,
1388         &trace_bputs_event,
1389         &trace_bprint_event,
1390         &trace_print_event,
1391         &trace_hwlat_event,
1392         &trace_raw_data_event,
1393         NULL
1394 };
1395 
1396 __init static int init_events(void)
1397 {
1398         struct trace_event *event;
1399         int i, ret;
1400 
1401         for (i = 0; events[i]; i++) {
1402                 event = events[i];
1403 
1404                 ret = register_trace_event(event);
1405                 if (!ret) {
1406                         printk(KERN_WARNING "event %d failed to register\n",
1407                                event->type);
1408                         WARN_ON_ONCE(1);
1409                 }
1410         }
1411 
1412         return 0;
1413 }
1414 early_initcall(init_events);
1415 

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