?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
isci: Initialize proc_name field in scsi_host_template
[linux-2.6.git] / include / trace / ftrace.h
blob533c49f480477321f3193320321cbf273b092698
1 /*
2 * Stage 1 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * struct ftrace_raw_<call> {
7 * struct trace_entry ent;
8 * <type> <item>;
9 * <type2> <item2>[<len>];
10 * [...]
11 * };
12 *
13 * The <type> <item> is created by the __field(type, item) macro or
14 * the __array(type2, item2, len) macro.
15 * We simply do "type item;", and that will create the fields
16 * in the structure.
17 */
18
19 #include <linux/ftrace_event.h>
20
21 /*
22 * DECLARE_EVENT_CLASS can be used to add a generic function
23 * handlers for events. That is, if all events have the same
24 * parameters and just have distinct trace points.
25 * Each tracepoint can be defined with DEFINE_EVENT and that
26 * will map the DECLARE_EVENT_CLASS to the tracepoint.
27 *
28 * TRACE_EVENT is a one to one mapping between tracepoint and template.
29 */
30 #undef TRACE_EVENT
31 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
32 DECLARE_EVENT_CLASS(name, \
33 PARAMS(proto), \
34 PARAMS(args), \
35 PARAMS(tstruct), \
36 PARAMS(assign), \
37 PARAMS(print)); \
38 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
39
40
41 #undef __field
42 #define __field(type, item) type item;
43
44 #undef __field_ext
45 #define __field_ext(type, item, filter_type) type item;
46
47 #undef __array
48 #define __array(type, item, len) type item[len];
49
50 #undef __dynamic_array
51 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
52
53 #undef __string
54 #define __string(item, src) __dynamic_array(char, item, -1)
55
56 #undef TP_STRUCT__entry
57 #define TP_STRUCT__entry(args...) args
58
59 #undef DECLARE_EVENT_CLASS
60 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
61 struct ftrace_raw_##name { \
62 struct trace_entry ent; \
63 tstruct \
64 char __data[0]; \
65 }; \
66 \
67 static struct ftrace_event_class event_class_##name;
68
69 #undef DEFINE_EVENT
70 #define DEFINE_EVENT(template, name, proto, args) \
71 static struct ftrace_event_call __used \
72 __attribute__((__aligned__(4))) event_##name
73
74 #undef DEFINE_EVENT_PRINT
75 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
76 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
77
78 /* Callbacks are meaningless to ftrace. */
79 #undef TRACE_EVENT_FN
80 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
81 assign, print, reg, unreg) \
82 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
83 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
84
85 #undef TRACE_EVENT_FLAGS
86 #define TRACE_EVENT_FLAGS(name, value) \
87 __TRACE_EVENT_FLAGS(name, value)
88
89 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
90
91
92 /*
93 * Stage 2 of the trace events.
94 *
95 * Include the following:
96 *
97 * struct ftrace_data_offsets_<call> {
98 * u32 <item1>;
99 * u32 <item2>;
100 * [...]
101 * };
102 *
103 * The __dynamic_array() macro will create each u32 <item>, this is
104 * to keep the offset of each array from the beginning of the event.
105 * The size of an array is also encoded, in the higher 16 bits of <item>.
106 */
107
108 #undef __field
109 #define __field(type, item)
110
111 #undef __field_ext
112 #define __field_ext(type, item, filter_type)
113
114 #undef __array
115 #define __array(type, item, len)
116
117 #undef __dynamic_array
118 #define __dynamic_array(type, item, len) u32 item;
119
120 #undef __string
121 #define __string(item, src) __dynamic_array(char, item, -1)
122
123 #undef DECLARE_EVENT_CLASS
124 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
125 struct ftrace_data_offsets_##call { \
126 tstruct; \
127 };
128
129 #undef DEFINE_EVENT
130 #define DEFINE_EVENT(template, name, proto, args)
131
132 #undef DEFINE_EVENT_PRINT
133 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
134 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
135
136 #undef TRACE_EVENT_FLAGS
137 #define TRACE_EVENT_FLAGS(event, flag)
138
139 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
140
141 /*
142 * Stage 3 of the trace events.
143 *
144 * Override the macros in <trace/trace_events.h> to include the following:
145 *
146 * enum print_line_t
147 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
148 * {
149 * struct trace_seq *s = &iter->seq;
150 * struct ftrace_raw_<call> *field; <-- defined in stage 1
151 * struct trace_entry *entry;
152 * struct trace_seq *p = &iter->tmp_seq;
153 * int ret;
154 *
155 * entry = iter->ent;
156 *
157 * if (entry->type != event_<call>->event.type) {
158 * WARN_ON_ONCE(1);
159 * return TRACE_TYPE_UNHANDLED;
160 * }
161 *
162 * field = (typeof(field))entry;
163 *
164 * trace_seq_init(p);
165 * ret = trace_seq_printf(s, "%s: ", <call>);
166 * if (ret)
167 * ret = trace_seq_printf(s, <TP_printk> "\n");
168 * if (!ret)
169 * return TRACE_TYPE_PARTIAL_LINE;
170 *
171 * return TRACE_TYPE_HANDLED;
172 * }
173 *
174 * This is the method used to print the raw event to the trace
175 * output format. Note, this is not needed if the data is read
176 * in binary.
177 */
178
179 #undef __entry
180 #define __entry field
181
182 #undef TP_printk
183 #define TP_printk(fmt, args...) fmt "\n", args
184
185 #undef __get_dynamic_array
186 #define __get_dynamic_array(field) \
187 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
188
189 #undef __get_str
190 #define __get_str(field) (char *)__get_dynamic_array(field)
191
192 #undef __print_flags
193 #define __print_flags(flag, delim, flag_array...) \
194 ({ \
195 static const struct trace_print_flags __flags[] = \
196 { flag_array, { -1, NULL }}; \
197 ftrace_print_flags_seq(p, delim, flag, __flags); \
198 })
199
200 #undef __print_symbolic
201 #define __print_symbolic(value, symbol_array...) \
202 ({ \
203 static const struct trace_print_flags symbols[] = \
204 { symbol_array, { -1, NULL }}; \
205 ftrace_print_symbols_seq(p, value, symbols); \
206 })
207
208 #undef __print_symbolic_u64
209 #if BITS_PER_LONG == 32
210 #define __print_symbolic_u64(value, symbol_array...) \
211 ({ \
212 static const struct trace_print_flags_u64 symbols[] = \
213 { symbol_array, { -1, NULL } }; \
214 ftrace_print_symbols_seq_u64(p, value, symbols); \
215 })
216 #else
217 #define __print_symbolic_u64(value, symbol_array...) \
218 __print_symbolic(value, symbol_array)
219 #endif
220
221 #undef __print_hex
222 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
223
224 #undef DECLARE_EVENT_CLASS
225 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
226 static notrace enum print_line_t \
227 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
228 struct trace_event *trace_event) \
229 { \
230 struct ftrace_event_call *event; \
231 struct trace_seq *s = &iter->seq; \
232 struct ftrace_raw_##call *field; \
233 struct trace_entry *entry; \
234 struct trace_seq *p = &iter->tmp_seq; \
235 int ret; \
236 \
237 event = container_of(trace_event, struct ftrace_event_call, \
238 event); \
239 \
240 entry = iter->ent; \
241 \
242 if (entry->type != event->event.type) { \
243 WARN_ON_ONCE(1); \
244 return TRACE_TYPE_UNHANDLED; \
245 } \
246 \
247 field = (typeof(field))entry; \
248 \
249 trace_seq_init(p); \
250 ret = trace_seq_printf(s, "%s: ", event->name); \
251 if (ret) \
252 ret = trace_seq_printf(s, print); \
253 if (!ret) \
254 return TRACE_TYPE_PARTIAL_LINE; \
255 \
256 return TRACE_TYPE_HANDLED; \
257 } \
258 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
259 .trace = ftrace_raw_output_##call, \
260 };
261
262 #undef DEFINE_EVENT_PRINT
263 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
264 static notrace enum print_line_t \
265 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
266 struct trace_event *event) \
267 { \
268 struct trace_seq *s = &iter->seq; \
269 struct ftrace_raw_##template *field; \
270 struct trace_entry *entry; \
271 struct trace_seq *p = &iter->tmp_seq; \
272 int ret; \
273 \
274 entry = iter->ent; \
275 \
276 if (entry->type != event_##call.event.type) { \
277 WARN_ON_ONCE(1); \
278 return TRACE_TYPE_UNHANDLED; \
279 } \
280 \
281 field = (typeof(field))entry; \
282 \
283 trace_seq_init(p); \
284 ret = trace_seq_printf(s, "%s: ", #call); \
285 if (ret) \
286 ret = trace_seq_printf(s, print); \
287 if (!ret) \
288 return TRACE_TYPE_PARTIAL_LINE; \
289 \
290 return TRACE_TYPE_HANDLED; \
291 } \
292 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
293 .trace = ftrace_raw_output_##call, \
294 };
295
296 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
297
298 #undef __field_ext
299 #define __field_ext(type, item, filter_type) \
300 ret = trace_define_field(event_call, #type, #item, \
301 offsetof(typeof(field), item), \
302 sizeof(field.item), \
303 is_signed_type(type), filter_type); \
304 if (ret) \
305 return ret;
306
307 #undef __field
308 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
309
310 #undef __array
311 #define __array(type, item, len) \
312 do { \
313 mutex_lock(&event_storage_mutex); \
314 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
315 snprintf(event_storage, sizeof(event_storage), \
316 "%s[%d]", #type, len); \
317 ret = trace_define_field(event_call, event_storage, #item, \
318 offsetof(typeof(field), item), \
319 sizeof(field.item), \
320 is_signed_type(type), FILTER_OTHER); \
321 mutex_unlock(&event_storage_mutex); \
322 if (ret) \
323 return ret; \
324 } while (0);
325
326 #undef __dynamic_array
327 #define __dynamic_array(type, item, len) \
328 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
329 offsetof(typeof(field), __data_loc_##item), \
330 sizeof(field.__data_loc_##item), \
331 is_signed_type(type), FILTER_OTHER);
332
333 #undef __string
334 #define __string(item, src) __dynamic_array(char, item, -1)
335
336 #undef DECLARE_EVENT_CLASS
337 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
338 static int notrace \
339 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
340 { \
341 struct ftrace_raw_##call field; \
342 int ret; \
343 \
344 tstruct; \
345 \
346 return ret; \
347 }
348
349 #undef DEFINE_EVENT
350 #define DEFINE_EVENT(template, name, proto, args)
351
352 #undef DEFINE_EVENT_PRINT
353 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
354 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
355
356 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
357
358 /*
359 * remember the offset of each array from the beginning of the event.
360 */
361
362 #undef __entry
363 #define __entry entry
364
365 #undef __field
366 #define __field(type, item)
367
368 #undef __field_ext
369 #define __field_ext(type, item, filter_type)
370
371 #undef __array
372 #define __array(type, item, len)
373
374 #undef __dynamic_array
375 #define __dynamic_array(type, item, len) \
376 __data_offsets->item = __data_size + \
377 offsetof(typeof(*entry), __data); \
378 __data_offsets->item |= (len * sizeof(type)) << 16; \
379 __data_size += (len) * sizeof(type);
380
381 #undef __string
382 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
383
384 #undef DECLARE_EVENT_CLASS
385 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
386 static inline notrace int ftrace_get_offsets_##call( \
387 struct ftrace_data_offsets_##call *__data_offsets, proto) \
388 { \
389 int __data_size = 0; \
390 struct ftrace_raw_##call __maybe_unused *entry; \
391 \
392 tstruct; \
393 \
394 return __data_size; \
395 }
396
397 #undef DEFINE_EVENT
398 #define DEFINE_EVENT(template, name, proto, args)
399
400 #undef DEFINE_EVENT_PRINT
401 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
402 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
403
404 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
405
406 /*
407 * Stage 4 of the trace events.
408 *
409 * Override the macros in <trace/trace_events.h> to include the following:
410 *
411 * For those macros defined with TRACE_EVENT:
412 *
413 * static struct ftrace_event_call event_<call>;
414 *
415 * static void ftrace_raw_event_<call>(void *__data, proto)
416 * {
417 * struct ftrace_event_call *event_call = __data;
418 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
419 * struct ring_buffer_event *event;
420 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
421 * struct ring_buffer *buffer;
422 * unsigned long irq_flags;
423 * int __data_size;
424 * int pc;
425 *
426 * local_save_flags(irq_flags);
427 * pc = preempt_count();
428 *
429 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
430 *
431 * event = trace_current_buffer_lock_reserve(&buffer,
432 * event_<call>->event.type,
433 * sizeof(*entry) + __data_size,
434 * irq_flags, pc);
435 * if (!event)
436 * return;
437 * entry = ring_buffer_event_data(event);
438 *
439 * { <assign>; } <-- Here we assign the entries by the __field and
440 * __array macros.
441 *
442 * if (!filter_current_check_discard(buffer, event_call, entry, event))
443 * trace_current_buffer_unlock_commit(buffer,
444 * event, irq_flags, pc);
445 * }
446 *
447 * static struct trace_event ftrace_event_type_<call> = {
448 * .trace = ftrace_raw_output_<call>, <-- stage 2
449 * };
450 *
451 * static const char print_fmt_<call>[] = <TP_printk>;
452 *
453 * static struct ftrace_event_class __used event_class_<template> = {
454 * .system = "<system>",
455 * .define_fields = ftrace_define_fields_<call>,
456 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
457 * .raw_init = trace_event_raw_init,
458 * .probe = ftrace_raw_event_##call,
459 * .reg = ftrace_event_reg,
460 * };
461 *
462 * static struct ftrace_event_call event_<call> = {
463 * .name = "<call>",
464 * .class = event_class_<template>,
465 * .event = &ftrace_event_type_<call>,
466 * .print_fmt = print_fmt_<call>,
467 * };
468 * // its only safe to use pointers when doing linker tricks to
469 * // create an array.
470 * static struct ftrace_event_call __used
471 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
472 *
473 */
474
475 #ifdef CONFIG_PERF_EVENTS
476
477 #define _TRACE_PERF_PROTO(call, proto) \
478 static notrace void \
479 perf_trace_##call(void *__data, proto);
480
481 #define _TRACE_PERF_INIT(call) \
482 .perf_probe = perf_trace_##call,
483
484 #else
485 #define _TRACE_PERF_PROTO(call, proto)
486 #define _TRACE_PERF_INIT(call)
487 #endif /* CONFIG_PERF_EVENTS */
488
489 #undef __entry
490 #define __entry entry
491
492 #undef __field
493 #define __field(type, item)
494
495 #undef __array
496 #define __array(type, item, len)
497
498 #undef __dynamic_array
499 #define __dynamic_array(type, item, len) \
500 __entry->__data_loc_##item = __data_offsets.item;
501
502 #undef __string
503 #define __string(item, src) __dynamic_array(char, item, -1) \
504
505 #undef __assign_str
506 #define __assign_str(dst, src) \
507 strcpy(__get_str(dst), src);
508
509 #undef TP_fast_assign
510 #define TP_fast_assign(args...) args
511
512 #undef TP_perf_assign
513 #define TP_perf_assign(args...)
514
515 #undef DECLARE_EVENT_CLASS
516 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
517 \
518 static notrace void \
519 ftrace_raw_event_##call(void *__data, proto) \
520 { \
521 struct ftrace_event_call *event_call = __data; \
522 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
523 struct ring_buffer_event *event; \
524 struct ftrace_raw_##call *entry; \
525 struct ring_buffer *buffer; \
526 unsigned long irq_flags; \
527 int __data_size; \
528 int pc; \
529 \
530 local_save_flags(irq_flags); \
531 pc = preempt_count(); \
532 \
533 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
534 \
535 event = trace_current_buffer_lock_reserve(&buffer, \
536 event_call->event.type, \
537 sizeof(*entry) + __data_size, \
538 irq_flags, pc); \
539 if (!event) \
540 return; \
541 entry = ring_buffer_event_data(event); \
542 \
543 tstruct \
544 \
545 { assign; } \
546 \
547 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
548 trace_nowake_buffer_unlock_commit(buffer, \
549 event, irq_flags, pc); \
550 }
551 /*
552 * The ftrace_test_probe is compiled out, it is only here as a build time check
553 * to make sure that if the tracepoint handling changes, the ftrace probe will
554 * fail to compile unless it too is updated.
555 */
556
557 #undef DEFINE_EVENT
558 #define DEFINE_EVENT(template, call, proto, args) \
559 static inline void ftrace_test_probe_##call(void) \
560 { \
561 check_trace_callback_type_##call(ftrace_raw_event_##template); \
562 }
563
564 #undef DEFINE_EVENT_PRINT
565 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
566
567 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
568
569 #undef __entry
570 #define __entry REC
571
572 #undef __print_flags
573 #undef __print_symbolic
574 #undef __get_dynamic_array
575 #undef __get_str
576
577 #undef TP_printk
578 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
579
580 #undef DECLARE_EVENT_CLASS
581 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
582 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
583 static const char print_fmt_##call[] = print; \
584 static struct ftrace_event_class __used event_class_##call = { \
585 .system = __stringify(TRACE_SYSTEM), \
586 .define_fields = ftrace_define_fields_##call, \
587 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
588 .raw_init = trace_event_raw_init, \
589 .probe = ftrace_raw_event_##call, \
590 .reg = ftrace_event_reg, \
591 _TRACE_PERF_INIT(call) \
592 };
593
594 #undef DEFINE_EVENT
595 #define DEFINE_EVENT(template, call, proto, args) \
596 \
597 static struct ftrace_event_call __used event_##call = { \
598 .name = #call, \
599 .class = &event_class_##template, \
600 .event.funcs = &ftrace_event_type_funcs_##template, \
601 .print_fmt = print_fmt_##template, \
602 }; \
603 static struct ftrace_event_call __used \
604 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
605
606 #undef DEFINE_EVENT_PRINT
607 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
608 \
609 static const char print_fmt_##call[] = print; \
610 \
611 static struct ftrace_event_call __used event_##call = { \
612 .name = #call, \
613 .class = &event_class_##template, \
614 .event.funcs = &ftrace_event_type_funcs_##call, \
615 .print_fmt = print_fmt_##call, \
616 }; \
617 static struct ftrace_event_call __used \
618 __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
619
620 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
621
622 /*
623 * Define the insertion callback to perf events
624 *
625 * The job is very similar to ftrace_raw_event_<call> except that we don't
626 * insert in the ring buffer but in a perf counter.
627 *
628 * static void ftrace_perf_<call>(proto)
629 * {
630 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
631 * struct ftrace_event_call *event_call = &event_<call>;
632 * extern void perf_tp_event(int, u64, u64, void *, int);
633 * struct ftrace_raw_##call *entry;
634 * struct perf_trace_buf *trace_buf;
635 * u64 __addr = 0, __count = 1;
636 * unsigned long irq_flags;
637 * struct trace_entry *ent;
638 * int __entry_size;
639 * int __data_size;
640 * int __cpu
641 * int pc;
642 *
643 * pc = preempt_count();
644 *
645 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
646 *
647 * // Below we want to get the aligned size by taking into account
648 * // the u32 field that will later store the buffer size
649 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
650 * sizeof(u64));
651 * __entry_size -= sizeof(u32);
652 *
653 * // Protect the non nmi buffer
654 * // This also protects the rcu read side
655 * local_irq_save(irq_flags);
656 * __cpu = smp_processor_id();
657 *
658 * if (in_nmi())
659 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
660 * else
661 * trace_buf = rcu_dereference_sched(perf_trace_buf);
662 *
663 * if (!trace_buf)
664 * goto end;
665 *
666 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
667 *
668 * // Avoid recursion from perf that could mess up the buffer
669 * if (trace_buf->recursion++)
670 * goto end_recursion;
671 *
672 * raw_data = trace_buf->buf;
673 *
674 * // Make recursion update visible before entering perf_tp_event
675 * // so that we protect from perf recursions.
676 *
677 * barrier();
678 *
679 * //zero dead bytes from alignment to avoid stack leak to userspace:
680 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
681 * entry = (struct ftrace_raw_<call> *)raw_data;
682 * ent = &entry->ent;
683 * tracing_generic_entry_update(ent, irq_flags, pc);
684 * ent->type = event_call->id;
685 *
686 * <tstruct> <- do some jobs with dynamic arrays
687 *
688 * <assign> <- affect our values
689 *
690 * perf_tp_event(event_call->id, __addr, __count, entry,
691 * __entry_size); <- submit them to perf counter
692 *
693 * }
694 */
695
696 #ifdef CONFIG_PERF_EVENTS
697
698 #undef __entry
699 #define __entry entry
700
701 #undef __get_dynamic_array
702 #define __get_dynamic_array(field) \
703 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
704
705 #undef __get_str
706 #define __get_str(field) (char *)__get_dynamic_array(field)
707
708 #undef __perf_addr
709 #define __perf_addr(a) __addr = (a)
710
711 #undef __perf_count
712 #define __perf_count(c) __count = (c)
713
714 #undef DECLARE_EVENT_CLASS
715 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
716 static notrace void \
717 perf_trace_##call(void *__data, proto) \
718 { \
719 struct ftrace_event_call *event_call = __data; \
720 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
721 struct ftrace_raw_##call *entry; \
722 struct pt_regs __regs; \
723 u64 __addr = 0, __count = 1; \
724 struct hlist_head *head; \
725 int __entry_size; \
726 int __data_size; \
727 int rctx; \
728 \
729 perf_fetch_caller_regs(&__regs); \
730 \
731 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
732 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
733 sizeof(u64)); \
734 __entry_size -= sizeof(u32); \
735 \
736 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
737 "profile buffer not large enough")) \
738 return; \
739 \
740 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
741 __entry_size, event_call->event.type, &__regs, &rctx); \
742 if (!entry) \
743 return; \
744 \
745 tstruct \
746 \
747 { assign; } \
748 \
749 head = this_cpu_ptr(event_call->perf_events); \
750 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
751 __count, &__regs, head); \
752 }
753
754 /*
755 * This part is compiled out, it is only here as a build time check
756 * to make sure that if the tracepoint handling changes, the
757 * perf probe will fail to compile unless it too is updated.
758 */
759 #undef DEFINE_EVENT
760 #define DEFINE_EVENT(template, call, proto, args) \
761 static inline void perf_test_probe_##call(void) \
762 { \
763 check_trace_callback_type_##call(perf_trace_##template); \
764 }
765
766
767 #undef DEFINE_EVENT_PRINT
768 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
769 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
770
771 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
772 #endif /* CONFIG_PERF_EVENTS */
773
774 #undef _TRACE_PROFILE_INIT
775
Linus' kernel tree