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f0868d1e SR |
1 | /* |
2 | * trace_output.c | |
3 | * | |
4 | * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/mutex.h> | |
10 | #include <linux/ftrace.h> | |
11 | ||
12 | #include "trace_output.h" | |
13 | ||
14 | /* must be a power of 2 */ | |
15 | #define EVENT_HASHSIZE 128 | |
16 | ||
17 | static DEFINE_MUTEX(trace_event_mutex); | |
18 | static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly; | |
19 | ||
20 | static int next_event_type = __TRACE_LAST_TYPE + 1; | |
21 | ||
22 | /** | |
23 | * trace_seq_printf - sequence printing of trace information | |
24 | * @s: trace sequence descriptor | |
25 | * @fmt: printf format string | |
26 | * | |
27 | * The tracer may use either sequence operations or its own | |
28 | * copy to user routines. To simplify formating of a trace | |
29 | * trace_seq_printf is used to store strings into a special | |
30 | * buffer (@s). Then the output may be either used by | |
31 | * the sequencer or pulled into another buffer. | |
32 | */ | |
33 | int | |
34 | trace_seq_printf(struct trace_seq *s, const char *fmt, ...) | |
35 | { | |
36 | int len = (PAGE_SIZE - 1) - s->len; | |
37 | va_list ap; | |
38 | int ret; | |
39 | ||
40 | if (!len) | |
41 | return 0; | |
42 | ||
43 | va_start(ap, fmt); | |
44 | ret = vsnprintf(s->buffer + s->len, len, fmt, ap); | |
45 | va_end(ap); | |
46 | ||
47 | /* If we can't write it all, don't bother writing anything */ | |
48 | if (ret >= len) | |
49 | return 0; | |
50 | ||
51 | s->len += ret; | |
52 | ||
53 | return len; | |
54 | } | |
55 | ||
56 | /** | |
57 | * trace_seq_puts - trace sequence printing of simple string | |
58 | * @s: trace sequence descriptor | |
59 | * @str: simple string to record | |
60 | * | |
61 | * The tracer may use either the sequence operations or its own | |
62 | * copy to user routines. This function records a simple string | |
63 | * into a special buffer (@s) for later retrieval by a sequencer | |
64 | * or other mechanism. | |
65 | */ | |
66 | int trace_seq_puts(struct trace_seq *s, const char *str) | |
67 | { | |
68 | int len = strlen(str); | |
69 | ||
70 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
71 | return 0; | |
72 | ||
73 | memcpy(s->buffer + s->len, str, len); | |
74 | s->len += len; | |
75 | ||
76 | return len; | |
77 | } | |
78 | ||
79 | int trace_seq_putc(struct trace_seq *s, unsigned char c) | |
80 | { | |
81 | if (s->len >= (PAGE_SIZE - 1)) | |
82 | return 0; | |
83 | ||
84 | s->buffer[s->len++] = c; | |
85 | ||
86 | return 1; | |
87 | } | |
88 | ||
89 | int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len) | |
90 | { | |
91 | if (len > ((PAGE_SIZE - 1) - s->len)) | |
92 | return 0; | |
93 | ||
94 | memcpy(s->buffer + s->len, mem, len); | |
95 | s->len += len; | |
96 | ||
97 | return len; | |
98 | } | |
99 | ||
100 | int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len) | |
101 | { | |
102 | unsigned char hex[HEX_CHARS]; | |
103 | unsigned char *data = mem; | |
104 | int i, j; | |
105 | ||
106 | #ifdef __BIG_ENDIAN | |
107 | for (i = 0, j = 0; i < len; i++) { | |
108 | #else | |
109 | for (i = len-1, j = 0; i >= 0; i--) { | |
110 | #endif | |
111 | hex[j++] = hex_asc_hi(data[i]); | |
112 | hex[j++] = hex_asc_lo(data[i]); | |
113 | } | |
114 | hex[j++] = ' '; | |
115 | ||
116 | return trace_seq_putmem(s, hex, j); | |
117 | } | |
118 | ||
119 | int trace_seq_path(struct trace_seq *s, struct path *path) | |
120 | { | |
121 | unsigned char *p; | |
122 | ||
123 | if (s->len >= (PAGE_SIZE - 1)) | |
124 | return 0; | |
125 | p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len); | |
126 | if (!IS_ERR(p)) { | |
127 | p = mangle_path(s->buffer + s->len, p, "\n"); | |
128 | if (p) { | |
129 | s->len = p - s->buffer; | |
130 | return 1; | |
131 | } | |
132 | } else { | |
133 | s->buffer[s->len++] = '?'; | |
134 | return 1; | |
135 | } | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | #ifdef CONFIG_KRETPROBES | |
141 | static inline const char *kretprobed(const char *name) | |
142 | { | |
143 | static const char tramp_name[] = "kretprobe_trampoline"; | |
144 | int size = sizeof(tramp_name); | |
145 | ||
146 | if (strncmp(tramp_name, name, size) == 0) | |
147 | return "[unknown/kretprobe'd]"; | |
148 | return name; | |
149 | } | |
150 | #else | |
151 | static inline const char *kretprobed(const char *name) | |
152 | { | |
153 | return name; | |
154 | } | |
155 | #endif /* CONFIG_KRETPROBES */ | |
156 | ||
157 | static int | |
158 | seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) | |
159 | { | |
160 | #ifdef CONFIG_KALLSYMS | |
161 | char str[KSYM_SYMBOL_LEN]; | |
162 | const char *name; | |
163 | ||
164 | kallsyms_lookup(address, NULL, NULL, NULL, str); | |
165 | ||
166 | name = kretprobed(str); | |
167 | ||
168 | return trace_seq_printf(s, fmt, name); | |
169 | #endif | |
170 | return 1; | |
171 | } | |
172 | ||
173 | static int | |
174 | seq_print_sym_offset(struct trace_seq *s, const char *fmt, | |
175 | unsigned long address) | |
176 | { | |
177 | #ifdef CONFIG_KALLSYMS | |
178 | char str[KSYM_SYMBOL_LEN]; | |
179 | const char *name; | |
180 | ||
181 | sprint_symbol(str, address); | |
182 | name = kretprobed(str); | |
183 | ||
184 | return trace_seq_printf(s, fmt, name); | |
185 | #endif | |
186 | return 1; | |
187 | } | |
188 | ||
189 | #ifndef CONFIG_64BIT | |
190 | # define IP_FMT "%08lx" | |
191 | #else | |
192 | # define IP_FMT "%016lx" | |
193 | #endif | |
194 | ||
195 | int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm, | |
196 | unsigned long ip, unsigned long sym_flags) | |
197 | { | |
198 | struct file *file = NULL; | |
199 | unsigned long vmstart = 0; | |
200 | int ret = 1; | |
201 | ||
202 | if (mm) { | |
203 | const struct vm_area_struct *vma; | |
204 | ||
205 | down_read(&mm->mmap_sem); | |
206 | vma = find_vma(mm, ip); | |
207 | if (vma) { | |
208 | file = vma->vm_file; | |
209 | vmstart = vma->vm_start; | |
210 | } | |
211 | if (file) { | |
212 | ret = trace_seq_path(s, &file->f_path); | |
213 | if (ret) | |
214 | ret = trace_seq_printf(s, "[+0x%lx]", | |
215 | ip - vmstart); | |
216 | } | |
217 | up_read(&mm->mmap_sem); | |
218 | } | |
219 | if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file)) | |
220 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); | |
221 | return ret; | |
222 | } | |
223 | ||
224 | int | |
225 | seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s, | |
226 | unsigned long sym_flags) | |
227 | { | |
228 | struct mm_struct *mm = NULL; | |
229 | int ret = 1; | |
230 | unsigned int i; | |
231 | ||
232 | if (trace_flags & TRACE_ITER_SYM_USEROBJ) { | |
233 | struct task_struct *task; | |
234 | /* | |
235 | * we do the lookup on the thread group leader, | |
236 | * since individual threads might have already quit! | |
237 | */ | |
238 | rcu_read_lock(); | |
239 | task = find_task_by_vpid(entry->ent.tgid); | |
240 | if (task) | |
241 | mm = get_task_mm(task); | |
242 | rcu_read_unlock(); | |
243 | } | |
244 | ||
245 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
246 | unsigned long ip = entry->caller[i]; | |
247 | ||
248 | if (ip == ULONG_MAX || !ret) | |
249 | break; | |
250 | if (i && ret) | |
251 | ret = trace_seq_puts(s, " <- "); | |
252 | if (!ip) { | |
253 | if (ret) | |
254 | ret = trace_seq_puts(s, "??"); | |
255 | continue; | |
256 | } | |
257 | if (!ret) | |
258 | break; | |
259 | if (ret) | |
260 | ret = seq_print_user_ip(s, mm, ip, sym_flags); | |
261 | } | |
262 | ||
263 | if (mm) | |
264 | mmput(mm); | |
265 | return ret; | |
266 | } | |
267 | ||
268 | int | |
269 | seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags) | |
270 | { | |
271 | int ret; | |
272 | ||
273 | if (!ip) | |
274 | return trace_seq_printf(s, "0"); | |
275 | ||
276 | if (sym_flags & TRACE_ITER_SYM_OFFSET) | |
277 | ret = seq_print_sym_offset(s, "%s", ip); | |
278 | else | |
279 | ret = seq_print_sym_short(s, "%s", ip); | |
280 | ||
281 | if (!ret) | |
282 | return 0; | |
283 | ||
284 | if (sym_flags & TRACE_ITER_SYM_ADDR) | |
285 | ret = trace_seq_printf(s, " <" IP_FMT ">", ip); | |
286 | return ret; | |
287 | } | |
288 | ||
f633cef0 SR |
289 | static const char state_to_char[] = TASK_STATE_TO_CHAR_STR; |
290 | ||
291 | static int task_state_char(unsigned long state) | |
292 | { | |
293 | int bit = state ? __ffs(state) + 1 : 0; | |
294 | ||
295 | return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?'; | |
296 | } | |
297 | ||
f0868d1e SR |
298 | /** |
299 | * ftrace_find_event - find a registered event | |
300 | * @type: the type of event to look for | |
301 | * | |
302 | * Returns an event of type @type otherwise NULL | |
303 | */ | |
304 | struct trace_event *ftrace_find_event(int type) | |
305 | { | |
306 | struct trace_event *event; | |
307 | struct hlist_node *n; | |
308 | unsigned key; | |
309 | ||
310 | key = type & (EVENT_HASHSIZE - 1); | |
311 | ||
312 | hlist_for_each_entry_rcu(event, n, &event_hash[key], node) { | |
313 | if (event->type == type) | |
314 | return event; | |
315 | } | |
316 | ||
317 | return NULL; | |
318 | } | |
319 | ||
320 | /** | |
321 | * register_ftrace_event - register output for an event type | |
322 | * @event: the event type to register | |
323 | * | |
324 | * Event types are stored in a hash and this hash is used to | |
325 | * find a way to print an event. If the @event->type is set | |
326 | * then it will use that type, otherwise it will assign a | |
327 | * type to use. | |
328 | * | |
329 | * If you assign your own type, please make sure it is added | |
330 | * to the trace_type enum in trace.h, to avoid collisions | |
331 | * with the dynamic types. | |
332 | * | |
333 | * Returns the event type number or zero on error. | |
334 | */ | |
335 | int register_ftrace_event(struct trace_event *event) | |
336 | { | |
337 | unsigned key; | |
338 | int ret = 0; | |
339 | ||
340 | mutex_lock(&trace_event_mutex); | |
341 | ||
342 | if (!event->type) | |
343 | event->type = next_event_type++; | |
344 | else if (event->type > __TRACE_LAST_TYPE) { | |
345 | printk(KERN_WARNING "Need to add type to trace.h\n"); | |
346 | WARN_ON(1); | |
347 | } | |
348 | ||
349 | if (ftrace_find_event(event->type)) | |
350 | goto out; | |
351 | ||
352 | key = event->type & (EVENT_HASHSIZE - 1); | |
353 | ||
354 | hlist_add_head_rcu(&event->node, &event_hash[key]); | |
355 | ||
356 | ret = event->type; | |
357 | out: | |
358 | mutex_unlock(&trace_event_mutex); | |
359 | ||
360 | return ret; | |
361 | } | |
362 | ||
363 | /** | |
364 | * unregister_ftrace_event - remove a no longer used event | |
365 | * @event: the event to remove | |
366 | */ | |
367 | int unregister_ftrace_event(struct trace_event *event) | |
368 | { | |
369 | mutex_lock(&trace_event_mutex); | |
370 | hlist_del(&event->node); | |
371 | mutex_unlock(&trace_event_mutex); | |
372 | ||
373 | return 0; | |
374 | } | |
f633cef0 SR |
375 | |
376 | /* | |
377 | * Standard events | |
378 | */ | |
379 | ||
380 | int | |
381 | trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
382 | { | |
383 | return 0; | |
384 | } | |
385 | ||
386 | /* TRACE_FN */ | |
387 | static int | |
388 | trace_fn_latency(struct trace_seq *s, struct trace_entry *entry, int flags) | |
389 | { | |
390 | struct ftrace_entry *field; | |
391 | ||
392 | trace_assign_type(field, entry); | |
393 | ||
394 | if (!seq_print_ip_sym(s, field->ip, flags)) | |
395 | goto partial; | |
396 | if (!trace_seq_puts(s, " (")) | |
397 | goto partial; | |
398 | if (!seq_print_ip_sym(s, field->parent_ip, flags)) | |
399 | goto partial; | |
400 | if (!trace_seq_puts(s, ")\n")) | |
401 | goto partial; | |
402 | ||
403 | return 0; | |
404 | ||
405 | partial: | |
406 | return TRACE_TYPE_PARTIAL_LINE; | |
407 | } | |
408 | ||
409 | static int | |
410 | trace_fn_trace(struct trace_seq *s, struct trace_entry *entry, int flags) | |
411 | { | |
412 | struct ftrace_entry *field; | |
413 | ||
414 | trace_assign_type(field, entry); | |
415 | ||
416 | if (!seq_print_ip_sym(s, field->ip, flags)) | |
417 | goto partial; | |
418 | ||
419 | if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) { | |
420 | if (!trace_seq_printf(s, " <-")) | |
421 | goto partial; | |
422 | if (!seq_print_ip_sym(s, | |
423 | field->parent_ip, | |
424 | flags)) | |
425 | goto partial; | |
426 | } | |
427 | if (!trace_seq_printf(s, "\n")) | |
428 | goto partial; | |
429 | ||
430 | return 0; | |
431 | ||
432 | partial: | |
433 | return TRACE_TYPE_PARTIAL_LINE; | |
434 | } | |
435 | ||
436 | static int | |
437 | trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags) | |
438 | { | |
439 | struct ftrace_entry *field; | |
440 | ||
441 | trace_assign_type(field, entry); | |
442 | ||
443 | if (trace_seq_printf(s, "%x %x\n", | |
444 | field->ip, | |
445 | field->parent_ip)) | |
446 | return TRACE_TYPE_PARTIAL_LINE; | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | static int | |
452 | trace_fn_hex(struct trace_seq *s, struct trace_entry *entry, int flags) | |
453 | { | |
454 | struct ftrace_entry *field; | |
455 | ||
456 | trace_assign_type(field, entry); | |
457 | ||
458 | SEQ_PUT_HEX_FIELD_RET(s, field->ip); | |
459 | SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip); | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | static int | |
465 | trace_fn_bin(struct trace_seq *s, struct trace_entry *entry, int flags) | |
466 | { | |
467 | struct ftrace_entry *field; | |
468 | ||
469 | trace_assign_type(field, entry); | |
470 | ||
471 | SEQ_PUT_FIELD_RET(s, field->ip); | |
472 | SEQ_PUT_FIELD_RET(s, field->parent_ip); | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static struct trace_event trace_fn_event = { | |
478 | .type = TRACE_FN, | |
479 | .trace = trace_fn_trace, | |
480 | .latency_trace = trace_fn_latency, | |
481 | .raw = trace_fn_raw, | |
482 | .hex = trace_fn_hex, | |
483 | .binary = trace_fn_bin, | |
484 | }; | |
485 | ||
486 | /* TRACE_CTX an TRACE_WAKE */ | |
487 | static int | |
488 | trace_ctxwake_print(struct trace_seq *s, struct trace_entry *entry, int flags, | |
489 | char *delim) | |
490 | { | |
491 | struct ctx_switch_entry *field; | |
492 | char *comm; | |
493 | int S, T; | |
494 | ||
495 | trace_assign_type(field, entry); | |
496 | ||
497 | T = task_state_char(field->next_state); | |
498 | S = task_state_char(field->prev_state); | |
499 | comm = trace_find_cmdline(field->next_pid); | |
500 | if (trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n", | |
501 | field->prev_pid, | |
502 | field->prev_prio, | |
503 | S, delim, | |
504 | field->next_cpu, | |
505 | field->next_pid, | |
506 | field->next_prio, | |
507 | T, comm)) | |
508 | return TRACE_TYPE_PARTIAL_LINE; | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int | |
514 | trace_ctx_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
515 | { | |
516 | return trace_ctxwake_print(s, entry, flags, "==>"); | |
517 | } | |
518 | ||
519 | static int | |
520 | trace_wake_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
521 | { | |
522 | return trace_ctxwake_print(s, entry, flags, " +"); | |
523 | } | |
524 | ||
525 | static int | |
526 | trace_ctxwake_raw(struct trace_seq *s, struct trace_entry *entry, int flags, | |
527 | char S) | |
528 | { | |
529 | struct ctx_switch_entry *field; | |
530 | int T; | |
531 | ||
532 | trace_assign_type(field, entry); | |
533 | ||
534 | if (!S) | |
535 | task_state_char(field->prev_state); | |
536 | T = task_state_char(field->next_state); | |
537 | if (trace_seq_printf(s, "%d %d %c %d %d %d %c\n", | |
538 | field->prev_pid, | |
539 | field->prev_prio, | |
540 | S, | |
541 | field->next_cpu, | |
542 | field->next_pid, | |
543 | field->next_prio, | |
544 | T)) | |
545 | return TRACE_TYPE_PARTIAL_LINE; | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static int | |
551 | trace_ctx_raw(struct trace_seq *s, struct trace_entry *entry, int flags) | |
552 | { | |
553 | return trace_ctxwake_raw(s, entry, flags, 0); | |
554 | } | |
555 | ||
556 | static int | |
557 | trace_wake_raw(struct trace_seq *s, struct trace_entry *entry, int flags) | |
558 | { | |
559 | return trace_ctxwake_raw(s, entry, flags, '+'); | |
560 | } | |
561 | ||
562 | ||
563 | static int | |
564 | trace_ctxwake_hex(struct trace_seq *s, struct trace_entry *entry, int flags, | |
565 | char S) | |
566 | { | |
567 | struct ctx_switch_entry *field; | |
568 | int T; | |
569 | ||
570 | trace_assign_type(field, entry); | |
571 | ||
572 | if (!S) | |
573 | task_state_char(field->prev_state); | |
574 | T = task_state_char(field->next_state); | |
575 | ||
576 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid); | |
577 | SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio); | |
578 | SEQ_PUT_HEX_FIELD_RET(s, S); | |
579 | SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu); | |
580 | SEQ_PUT_HEX_FIELD_RET(s, field->next_pid); | |
581 | SEQ_PUT_HEX_FIELD_RET(s, field->next_prio); | |
582 | SEQ_PUT_HEX_FIELD_RET(s, T); | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
587 | static int | |
588 | trace_ctx_hex(struct trace_seq *s, struct trace_entry *entry, int flags) | |
589 | { | |
590 | return trace_ctxwake_hex(s, entry, flags, 0); | |
591 | } | |
592 | ||
593 | static int | |
594 | trace_wake_hex(struct trace_seq *s, struct trace_entry *entry, int flags) | |
595 | { | |
596 | return trace_ctxwake_hex(s, entry, flags, '+'); | |
597 | } | |
598 | ||
599 | static int | |
600 | trace_ctxwake_bin(struct trace_seq *s, struct trace_entry *entry, int flags) | |
601 | { | |
602 | struct ctx_switch_entry *field; | |
603 | ||
604 | trace_assign_type(field, entry); | |
605 | ||
606 | SEQ_PUT_FIELD_RET(s, field->prev_pid); | |
607 | SEQ_PUT_FIELD_RET(s, field->prev_prio); | |
608 | SEQ_PUT_FIELD_RET(s, field->prev_state); | |
609 | SEQ_PUT_FIELD_RET(s, field->next_pid); | |
610 | SEQ_PUT_FIELD_RET(s, field->next_prio); | |
611 | SEQ_PUT_FIELD_RET(s, field->next_state); | |
612 | ||
613 | return 0; | |
614 | } | |
615 | ||
616 | static struct trace_event trace_ctx_event = { | |
617 | .type = TRACE_CTX, | |
618 | .trace = trace_ctx_print, | |
619 | .latency_trace = trace_ctx_print, | |
620 | .raw = trace_ctx_raw, | |
621 | .hex = trace_ctx_hex, | |
622 | .binary = trace_ctxwake_bin, | |
623 | }; | |
624 | ||
625 | static struct trace_event trace_wake_event = { | |
626 | .type = TRACE_WAKE, | |
627 | .trace = trace_wake_print, | |
628 | .latency_trace = trace_wake_print, | |
629 | .raw = trace_wake_raw, | |
630 | .hex = trace_wake_hex, | |
631 | .binary = trace_ctxwake_bin, | |
632 | }; | |
633 | ||
634 | /* TRACE_SPECIAL */ | |
635 | static int | |
636 | trace_special_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
637 | { | |
638 | struct special_entry *field; | |
639 | ||
640 | trace_assign_type(field, entry); | |
641 | ||
642 | if (trace_seq_printf(s, "# %ld %ld %ld\n", | |
643 | field->arg1, | |
644 | field->arg2, | |
645 | field->arg3)) | |
646 | return TRACE_TYPE_PARTIAL_LINE; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | static int | |
652 | trace_special_hex(struct trace_seq *s, struct trace_entry *entry, int flags) | |
653 | { | |
654 | struct special_entry *field; | |
655 | ||
656 | trace_assign_type(field, entry); | |
657 | ||
658 | SEQ_PUT_HEX_FIELD_RET(s, field->arg1); | |
659 | SEQ_PUT_HEX_FIELD_RET(s, field->arg2); | |
660 | SEQ_PUT_HEX_FIELD_RET(s, field->arg3); | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
665 | static int | |
666 | trace_special_bin(struct trace_seq *s, struct trace_entry *entry, int flags) | |
667 | { | |
668 | struct special_entry *field; | |
669 | ||
670 | trace_assign_type(field, entry); | |
671 | ||
672 | SEQ_PUT_FIELD_RET(s, field->arg1); | |
673 | SEQ_PUT_FIELD_RET(s, field->arg2); | |
674 | SEQ_PUT_FIELD_RET(s, field->arg3); | |
675 | ||
676 | return 0; | |
677 | } | |
678 | ||
679 | static struct trace_event trace_special_event = { | |
680 | .type = TRACE_SPECIAL, | |
681 | .trace = trace_special_print, | |
682 | .latency_trace = trace_special_print, | |
683 | .raw = trace_special_print, | |
684 | .hex = trace_special_hex, | |
685 | .binary = trace_special_bin, | |
686 | }; | |
687 | ||
688 | /* TRACE_STACK */ | |
689 | ||
690 | static int | |
691 | trace_stack_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
692 | { | |
693 | struct stack_entry *field; | |
694 | int i; | |
695 | ||
696 | trace_assign_type(field, entry); | |
697 | ||
698 | for (i = 0; i < FTRACE_STACK_ENTRIES; i++) { | |
699 | if (i) { | |
700 | if (trace_seq_puts(s, " <= ")) | |
701 | goto partial; | |
702 | ||
703 | if (seq_print_ip_sym(s, field->caller[i], flags)) | |
704 | goto partial; | |
705 | } | |
706 | if (trace_seq_puts(s, "\n")) | |
707 | goto partial; | |
708 | } | |
709 | ||
710 | return 0; | |
711 | ||
712 | partial: | |
713 | return TRACE_TYPE_PARTIAL_LINE; | |
714 | } | |
715 | ||
716 | static struct trace_event trace_stack_event = { | |
717 | .type = TRACE_STACK, | |
718 | .trace = trace_stack_print, | |
719 | .latency_trace = trace_stack_print, | |
720 | .raw = trace_special_print, | |
721 | .hex = trace_special_hex, | |
722 | .binary = trace_special_bin, | |
723 | }; | |
724 | ||
725 | /* TRACE_USER_STACK */ | |
726 | static int | |
727 | trace_user_stack_print(struct trace_seq *s, struct trace_entry *entry, | |
728 | int flags) | |
729 | { | |
730 | struct userstack_entry *field; | |
731 | ||
732 | trace_assign_type(field, entry); | |
733 | ||
734 | if (seq_print_userip_objs(field, s, flags)) | |
735 | goto partial; | |
736 | ||
737 | if (trace_seq_putc(s, '\n')) | |
738 | goto partial; | |
739 | ||
740 | return 0; | |
741 | ||
742 | partial: | |
743 | return TRACE_TYPE_PARTIAL_LINE; | |
744 | } | |
745 | ||
746 | static struct trace_event trace_user_stack_event = { | |
747 | .type = TRACE_USER_STACK, | |
748 | .trace = trace_user_stack_print, | |
749 | .latency_trace = trace_user_stack_print, | |
750 | .raw = trace_special_print, | |
751 | .hex = trace_special_hex, | |
752 | .binary = trace_special_bin, | |
753 | }; | |
754 | ||
755 | /* TRACE_PRINT */ | |
756 | static int | |
757 | trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags) | |
758 | { | |
759 | struct print_entry *field; | |
760 | ||
761 | trace_assign_type(field, entry); | |
762 | ||
763 | if (seq_print_ip_sym(s, field->ip, flags)) | |
764 | goto partial; | |
765 | ||
766 | if (trace_seq_printf(s, ": %s", field->buf)) | |
767 | goto partial; | |
768 | ||
769 | return 0; | |
770 | ||
771 | partial: | |
772 | return TRACE_TYPE_PARTIAL_LINE; | |
773 | } | |
774 | ||
775 | static int | |
776 | trace_print_raw(struct trace_seq *s, struct trace_entry *entry, int flags) | |
777 | { | |
778 | struct print_entry *field; | |
779 | ||
780 | trace_assign_type(field, entry); | |
781 | ||
782 | if (seq_print_ip_sym(s, field->ip, flags)) | |
783 | goto partial; | |
784 | ||
785 | if (trace_seq_printf(s, "# %lx %s", field->ip, field->buf)) | |
786 | goto partial; | |
787 | ||
788 | return 0; | |
789 | ||
790 | partial: | |
791 | return TRACE_TYPE_PARTIAL_LINE; | |
792 | } | |
793 | ||
794 | static struct trace_event trace_print_event = { | |
795 | .type = TRACE_PRINT, | |
796 | .trace = trace_print_print, | |
797 | .latency_trace = trace_print_print, | |
798 | .raw = trace_print_raw, | |
799 | .hex = trace_nop_print, | |
800 | .binary = trace_nop_print, | |
801 | }; | |
802 | ||
803 | static struct trace_event *events[] __initdata = { | |
804 | &trace_fn_event, | |
805 | &trace_ctx_event, | |
806 | &trace_wake_event, | |
807 | &trace_special_event, | |
808 | &trace_stack_event, | |
809 | &trace_user_stack_event, | |
810 | &trace_print_event, | |
811 | NULL | |
812 | }; | |
813 | ||
814 | __init static int init_events(void) | |
815 | { | |
816 | struct trace_event *event; | |
817 | int i, ret; | |
818 | ||
819 | for (i = 0; events[i]; i++) { | |
820 | event = events[i]; | |
821 | ||
822 | ret = register_ftrace_event(event); | |
823 | if (!ret) { | |
824 | printk(KERN_WARNING "event %d failed to register\n", | |
825 | event->type); | |
826 | WARN_ON_ONCE(1); | |
827 | } | |
828 | } | |
829 | ||
830 | return 0; | |
831 | } | |
832 | device_initcall(init_events); |