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Add sequence and string support
[lttng-modules.git] / probes / lttng-events.h
CommitLineData
40652b65
MD		 1#include <lttng.h>
2
3/*
4 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
5 * strcpy().
6 */
1d12cebd 7#undef tp_assign
40652b65
MD		 8#define tp_assign(dest, src) \
9 lib_ring_buffer_align_ctx(config, &ctx, sizeof(src)); \
10 lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
11
1d12cebd 12#undef tp_memcpy
40652b65
MD		 13#define tp_memcpy(dest, src, len) \
14 lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src))); \
15 lib_ring_buffer_write(config, &ctx, &src, len);
16
17/* TODO */
1d12cebd 18#undef tp_strcpy
40652b65
MD		 19#define tp_strcpy(dest, src) __assign_str(dest, src)
20
21/*
22 * Stage 1 of the trace events.
23 *
24 * Create event field type metadata section.
25 */
26
27/*
28 * DECLARE_EVENT_CLASS can be used to add a generic function
29 * handlers for events. That is, if all events have the same
30 * parameters and just have distinct trace points.
31 * Each tracepoint can be defined with DEFINE_EVENT and that
32 * will map the DECLARE_EVENT_CLASS to the tracepoint.
33 *
34 * TRACE_EVENT is a one to one mapping between tracepoint and template.
35 */
36#undef TRACE_EVENT
37#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
38 DECLARE_EVENT_CLASS(name, \
39 PARAMS(proto), \
40 PARAMS(args), \
41 PARAMS(tstruct), \
42 PARAMS(assign), \
43 PARAMS(print)); \
44 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
45
1d12cebd
MD		 46/* Named field types must be defined in lttng-types.h */
47
48/* TODO turn into a structure definition ? */
40652b65
MD		 49
50#undef __field
1d12cebd 51#define __field(_type, _item) #_type " " #_item ";\n"
40652b65
MD		 52
53#undef __field_ext
1d12cebd 54#define __field_ext(_type, _item, _filter_type) #_type " " #_item ";\n"
40652b65
MD		 55
56#undef __array
1d12cebd
MD		 57#define __array(_type, _item, _len) \
58 "type { parent = array; length = " #_len "; elem_type = " #_type "; } " #_item";\n"
40652b65
MD		 59
60#undef __dynamic_array
1d12cebd
MD		 61#define __dynamic_array(_type, _item, _len) \
62 "type { parent = sequence; length_type = u32; elem_type = " #_type "; } " #_item ";\n"
40652b65
MD		 63
64#undef __string
1d12cebd
MD		 65#define __string(_item, _src) \
66 "type { parent = string; encoding = UTF8; } " #_item ";\n"
67
68#undef TP_PROTO
69#define TP_PROTO(args...)
70
71#undef TP_ARGS
72#define TP_ARGS(args...)
40652b65
MD		 73
74#undef TP_STRUCT__entry
1d12cebd
MD		 75#define TP_STRUCT__entry(args...) args /* Only one used in this phase */
76
77#undef TP_fast_assign
78#define TP_fast_assign(args...)
79
80#undef TP_printk
81#define TP_printk(args...)
40652b65
MD		 82
83#undef DECLARE_EVENT_CLASS
84#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
1d12cebd 85 tstruct
40652b65
MD		 86
87#undef DEFINE_EVENT
1d12cebd 88#define DEFINE_EVENT(template, name, proto, args)
40652b65
MD		 89
90#undef DEFINE_EVENT_PRINT
91#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
92 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
93
1d12cebd 94/* Callbacks are meaningless to LTTng. */
40652b65
MD		 95#undef TRACE_EVENT_FN
96#define TRACE_EVENT_FN(name, proto, args, tstruct, \
97 assign, print, reg, unreg) \
98 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
99 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
100
1d12cebd
MD		 101#undef DEFINE_TRACE_EVENT_METADATA
102#define DEFINE_TRACE_EVENT_METADATA \
103 const char trace_event_metadata_##TRACE_SYSTEM[]
40652b65 104
1d12cebd
MD		 105//static DEFINE_TRACE_EVENT_METADATA =
106static const char blah[] =
40652b65 107#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1d12cebd
MD		 108;
109
110#if 0
40652b65
MD		 111
112/*
113 * Stage 2 of the trace events.
114 *
115 * Create static inline function that calculates event size.
116 */
117
118
119
120#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
121
122/*
123 * Stage 3 of the trace events.
124 *
125 * Create the probe function : call even size calculation and write event data
126 * into the buffer.
127 */
128
129
130
131#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
132
133
134
135
136#include <linux/ftrace_event.h>
137
138/*
139 * DECLARE_EVENT_CLASS can be used to add a generic function
140 * handlers for events. That is, if all events have the same
141 * parameters and just have distinct trace points.
142 * Each tracepoint can be defined with DEFINE_EVENT and that
143 * will map the DECLARE_EVENT_CLASS to the tracepoint.
144 *
145 * TRACE_EVENT is a one to one mapping between tracepoint and template.
146 */
147#undef TRACE_EVENT
148#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
149 DECLARE_EVENT_CLASS(name, \
150 PARAMS(proto), \
151 PARAMS(args), \
152 PARAMS(tstruct), \
153 PARAMS(assign), \
154 PARAMS(print)); \
155 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
156
157
158#undef __field
159#define __field(type, item) type item;
160
161#undef __field_ext
162#define __field_ext(type, item, filter_type) type item;
163
164#undef __array
165#define __array(type, item, len) type item[len];
166
167#undef __dynamic_array
168#define __dynamic_array(type, item, len) u32 __data_loc_##item;
169
170#undef __string
171#define __string(item, src) __dynamic_array(char, item, -1)
172
173#undef TP_STRUCT__entry
174#define TP_STRUCT__entry(args...) args
175
176#undef DECLARE_EVENT_CLASS
177#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
178 struct ftrace_raw_##name { \
179 struct trace_entry ent; \
180 tstruct \
181 char __data[0]; \
182 }; \
183 \
184 static struct ftrace_event_class event_class_##name;
185
186#undef DEFINE_EVENT
187#define DEFINE_EVENT(template, name, proto, args) \
188 static struct ftrace_event_call __used \
189 __attribute__((__aligned__(4))) event_##name
190
191#undef DEFINE_EVENT_PRINT
192#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
193 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
194
195/* Callbacks are meaningless to ftrace. */
196#undef TRACE_EVENT_FN
197#define TRACE_EVENT_FN(name, proto, args, tstruct, \
198 assign, print, reg, unreg) \
199 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
200 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
201
202#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
203
204
205/*
206 * Stage 2 of the trace events.
207 *
208 * Create static inline function that calculates event size.
209 */
210
211#undef __field
212#define __field(type, item)
213
214#undef __field_ext
215#define __field_ext(type, item, filter_type)
216
217#undef __array
218#define __array(type, item, len)
219
220#undef __dynamic_array
221#define __dynamic_array(type, item, len) u32 item;
222
223#undef __string
224#define __string(item, src) __dynamic_array(char, item, -1)
225
226#undef DECLARE_EVENT_CLASS
227#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
228 struct ftrace_data_offsets_##call { \
229 tstruct; \
230 };
231
232#undef DEFINE_EVENT
233#define DEFINE_EVENT(template, name, proto, args)
234
235#undef DEFINE_EVENT_PRINT
236#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
237 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
238
239#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
240
241/*
242 * Stage 3 of the trace events.
243 *
244 * Create the probe function : call even size calculation and write event data
245 * into the buffer.
246 */
247
248#undef __entry
249#define __entry field
250
251#undef TP_printk
252#define TP_printk(fmt, args...) fmt "\n", args
253
254#undef __get_dynamic_array
255#define __get_dynamic_array(field) \
256 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
257
258#undef __get_str
259#define __get_str(field) (char *)__get_dynamic_array(field)
260
261#undef __print_flags
262#define __print_flags(flag, delim, flag_array...) \
263 ({ \
264 static const struct trace_print_flags __flags[] = \
265 { flag_array, { -1, NULL }}; \
266 ftrace_print_flags_seq(p, delim, flag, __flags); \
267 })
268
269#undef __print_symbolic
270#define __print_symbolic(value, symbol_array...) \
271 ({ \
272 static const struct trace_print_flags symbols[] = \
273 { symbol_array, { -1, NULL }}; \
274 ftrace_print_symbols_seq(p, value, symbols); \
275 })
276
277#undef __print_hex
278#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
279
280#undef DECLARE_EVENT_CLASS
281#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
282static notrace enum print_line_t \
283ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
284 struct trace_event *trace_event) \
285{ \
286 struct ftrace_event_call *event; \
287 struct trace_seq *s = &iter->seq; \
288 struct ftrace_raw_##call *field; \
289 struct trace_entry *entry; \
290 struct trace_seq *p = &iter->tmp_seq; \
291 int ret; \
292 \
293 event = container_of(trace_event, struct ftrace_event_call, \
294 event); \
295 \
296 entry = iter->ent; \
297 \
298 if (entry->type != event->event.type) { \
299 WARN_ON_ONCE(1); \
300 return TRACE_TYPE_UNHANDLED; \
301 } \
302 \
303 field = (typeof(field))entry; \
304 \
305 trace_seq_init(p); \
306 ret = trace_seq_printf(s, "%s: ", event->name); \
307 if (ret) \
308 ret = trace_seq_printf(s, print); \
309 if (!ret) \
310 return TRACE_TYPE_PARTIAL_LINE; \
311 \
312 return TRACE_TYPE_HANDLED; \
313} \
314static struct trace_event_functions ftrace_event_type_funcs_##call = { \
315 .trace = ftrace_raw_output_##call, \
316};
317
318#undef DEFINE_EVENT_PRINT
319#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
320static notrace enum print_line_t \
321ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
322 struct trace_event *event) \
323{ \
324 struct trace_seq *s = &iter->seq; \
325 struct ftrace_raw_##template *field; \
326 struct trace_entry *entry; \
327 struct trace_seq *p = &iter->tmp_seq; \
328 int ret; \
329 \
330 entry = iter->ent; \
331 \
332 if (entry->type != event_##call.event.type) { \
333 WARN_ON_ONCE(1); \
334 return TRACE_TYPE_UNHANDLED; \
335 } \
336 \
337 field = (typeof(field))entry; \
338 \
339 trace_seq_init(p); \
340 ret = trace_seq_printf(s, "%s: ", #call); \
341 if (ret) \
342 ret = trace_seq_printf(s, print); \
343 if (!ret) \
344 return TRACE_TYPE_PARTIAL_LINE; \
345 \
346 return TRACE_TYPE_HANDLED; \
347} \
348static struct trace_event_functions ftrace_event_type_funcs_##call = { \
349 .trace = ftrace_raw_output_##call, \
350};
351
352#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
353
354#undef __field_ext
355#define __field_ext(type, item, filter_type) \
356 ret = trace_define_field(event_call, #type, #item, \
357 offsetof(typeof(field), item), \
358 sizeof(field.item), \
359 is_signed_type(type), filter_type); \
360 if (ret) \
361 return ret;
362
363#undef __field
364#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
365
366#undef __array
367#define __array(type, item, len) \
368 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
369 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
370 offsetof(typeof(field), item), \
371 sizeof(field.item), \
372 is_signed_type(type), FILTER_OTHER); \
373 if (ret) \
374 return ret;
375
376#undef __dynamic_array
377#define __dynamic_array(type, item, len) \
378 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
379 offsetof(typeof(field), __data_loc_##item), \
380 sizeof(field.__data_loc_##item), \
381 is_signed_type(type), FILTER_OTHER);
382
383#undef __string
384#define __string(item, src) __dynamic_array(char, item, -1)
385
386#undef DECLARE_EVENT_CLASS
387#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
388static int notrace \
389ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
390{ \
391 struct ftrace_raw_##call field; \
392 int ret; \
393 \
394 tstruct; \
395 \
396 return ret; \
397}
398
399#undef DEFINE_EVENT
400#define DEFINE_EVENT(template, name, proto, args)
401
402#undef DEFINE_EVENT_PRINT
403#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
404 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
405
406#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
407
408/*
409 * remember the offset of each array from the beginning of the event.
410 */
411
412#undef __entry
413#define __entry entry
414
415#undef __field
416#define __field(type, item)
417
418#undef __field_ext
419#define __field_ext(type, item, filter_type)
420
421#undef __array
422#define __array(type, item, len)
423
424#undef __dynamic_array
425#define __dynamic_array(type, item, len) \
426 __data_offsets->item = __data_size + \
427 offsetof(typeof(*entry), __data); \
428 __data_offsets->item |= (len * sizeof(type)) << 16; \
429 __data_size += (len) * sizeof(type);
430
431#undef __string
432#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
433
434#undef DECLARE_EVENT_CLASS
435#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
436static inline notrace int ftrace_get_offsets_##call( \
437 struct ftrace_data_offsets_##call *__data_offsets, proto) \
438{ \
439 int __data_size = 0; \
440 struct ftrace_raw_##call __maybe_unused *entry; \
441 \
442 tstruct; \
443 \
444 return __data_size; \
445}
446
447#undef DEFINE_EVENT
448#define DEFINE_EVENT(template, name, proto, args)
449
450#undef DEFINE_EVENT_PRINT
451#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
452 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
453
454#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
455
456/*
457 * Stage 4 of the trace events.
458 *
459 * Override the macros in <trace/trace_events.h> to include the following:
460 *
461 * For those macros defined with TRACE_EVENT:
462 *
463 * static struct ftrace_event_call event_<call>;
464 *
465 * static void ftrace_raw_event_<call>(void *__data, proto)
466 * {
467 * struct ftrace_event_call *event_call = __data;
468 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
469 * struct ring_buffer_event *event;
470 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
471 * struct ring_buffer *buffer;
472 * unsigned long irq_flags;
473 * int __data_size;
474 * int pc;
475 *
476 * local_save_flags(irq_flags);
477 * pc = preempt_count();
478 *
479 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
480 *
481 * event = trace_current_buffer_lock_reserve(&buffer,
482 * event_<call>->event.type,
483 * sizeof(*entry) + __data_size,
484 * irq_flags, pc);
485 * if (!event)
486 * return;
487 * entry = ring_buffer_event_data(event);
488 *
489 * { <assign>; } <-- Here we assign the entries by the __field and
490 * __array macros.
491 *
492 * if (!filter_current_check_discard(buffer, event_call, entry, event))
493 * trace_current_buffer_unlock_commit(buffer,
494 * event, irq_flags, pc);
495 * }
496 *
497 * static struct trace_event ftrace_event_type_<call> = {
498 * .trace = ftrace_raw_output_<call>, <-- stage 2
499 * };
500 *
501 * static const char print_fmt_<call>[] = <TP_printk>;
502 *
503 * static struct ftrace_event_class __used event_class_<template> = {
504 * .system = "<system>",
505 * .define_fields = ftrace_define_fields_<call>,
506 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
507 * .raw_init = trace_event_raw_init,
508 * .probe = ftrace_raw_event_##call,
509 * .reg = ftrace_event_reg,
510 * };
511 *
512 * static struct ftrace_event_call __used
513 * __attribute__((__aligned__(4)))
514 * __attribute__((section("_ftrace_events"))) event_<call> = {
515 * .name = "<call>",
516 * .class = event_class_<template>,
517 * .event = &ftrace_event_type_<call>,
518 * .print_fmt = print_fmt_<call>,
519 * };
520 *
521 */
522
523#ifdef CONFIG_PERF_EVENTS
524
525#define _TRACE_PERF_PROTO(call, proto) \
526 static notrace void \
527 perf_trace_##call(void *__data, proto);
528
529#define _TRACE_PERF_INIT(call) \
530 .perf_probe = perf_trace_##call,
531
532#else
533#define _TRACE_PERF_PROTO(call, proto)
534#define _TRACE_PERF_INIT(call)
535#endif /* CONFIG_PERF_EVENTS */
536
537#undef __entry
538#define __entry entry
539
540#undef __field
541#define __field(type, item)
542
543#undef __array
544#define __array(type, item, len)
545
546#undef __dynamic_array
547#define __dynamic_array(type, item, len) \
548 __entry->__data_loc_##item = __data_offsets.item;
549
550#undef __string
551#define __string(item, src) __dynamic_array(char, item, -1) \
552
553#undef __assign_str
554#define __assign_str(dst, src) \
555 strcpy(__get_str(dst), src);
556
557#undef TP_fast_assign
558#define TP_fast_assign(args...) args
559
560#undef TP_perf_assign
561#define TP_perf_assign(args...)
562
563#undef DECLARE_EVENT_CLASS
564#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
565 \
566static notrace void \
567ftrace_raw_event_##call(void *__data, proto) \
568{ \
569 struct ftrace_event_call *event_call = __data; \
570 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
571 struct ring_buffer_event *event; \
572 struct ftrace_raw_##call *entry; \
573 struct ring_buffer *buffer; \
574 unsigned long irq_flags; \
575 int __data_size; \
576 int pc; \
577 \
578 local_save_flags(irq_flags); \
579 pc = preempt_count(); \
580 \
581 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
582 \
583 event = trace_current_buffer_lock_reserve(&buffer, \
584 event_call->event.type, \
585 sizeof(*entry) + __data_size, \
586 irq_flags, pc); \
587 if (!event) \
588 return; \
589 entry = ring_buffer_event_data(event); \
590 \
591 tstruct \
592 \
593 { assign; } \
594 \
595 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
596 trace_nowake_buffer_unlock_commit(buffer, \
597 event, irq_flags, pc); \
598}
599/*
600 * The ftrace_test_probe is compiled out, it is only here as a build time check
601 * to make sure that if the tracepoint handling changes, the ftrace probe will
602 * fail to compile unless it too is updated.
603 */
604
605#undef DEFINE_EVENT
606#define DEFINE_EVENT(template, call, proto, args) \
607static inline void ftrace_test_probe_##call(void) \
608{ \
609 check_trace_callback_type_##call(ftrace_raw_event_##template); \
610}
611
612#undef DEFINE_EVENT_PRINT
613#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
614
615#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
616
617#undef __entry
618#define __entry REC
619
620#undef __print_flags
621#undef __print_symbolic
622#undef __get_dynamic_array
623#undef __get_str
624
625#undef TP_printk
626#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
627
628#undef DECLARE_EVENT_CLASS
629#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
630_TRACE_PERF_PROTO(call, PARAMS(proto)); \
631static const char print_fmt_##call[] = print; \
632static struct ftrace_event_class __used event_class_##call = { \
633 .system = __stringify(TRACE_SYSTEM), \
634 .define_fields = ftrace_define_fields_##call, \
635 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
636 .raw_init = trace_event_raw_init, \
637 .probe = ftrace_raw_event_##call, \
638 .reg = ftrace_event_reg, \
639 _TRACE_PERF_INIT(call) \
640};
641
642#undef DEFINE_EVENT
643#define DEFINE_EVENT(template, call, proto, args) \
644 \
645static struct ftrace_event_call __used \
646__attribute__((__aligned__(4))) \
647__attribute__((section("_ftrace_events"))) event_##call = { \
648 .name = #call, \
649 .class = &event_class_##template, \
650 .event.funcs = &ftrace_event_type_funcs_##template, \
651 .print_fmt = print_fmt_##template, \
652};
653
654#undef DEFINE_EVENT_PRINT
655#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
656 \
657static const char print_fmt_##call[] = print; \
658 \
659static struct ftrace_event_call __used \
660__attribute__((__aligned__(4))) \
661__attribute__((section("_ftrace_events"))) event_##call = { \
662 .name = #call, \
663 .class = &event_class_##template, \
664 .event.funcs = &ftrace_event_type_funcs_##call, \
665 .print_fmt = print_fmt_##call, \
666}
667
668#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
669
670/*
671 * Define the insertion callback to perf events
672 *
673 * The job is very similar to ftrace_raw_event_<call> except that we don't
674 * insert in the ring buffer but in a perf counter.
675 *
676 * static void ftrace_perf_<call>(proto)
677 * {
678 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
679 * struct ftrace_event_call *event_call = &event_<call>;
680 * extern void perf_tp_event(int, u64, u64, void *, int);
681 * struct ftrace_raw_##call *entry;
682 * struct perf_trace_buf *trace_buf;
683 * u64 __addr = 0, __count = 1;
684 * unsigned long irq_flags;
685 * struct trace_entry *ent;
686 * int __entry_size;
687 * int __data_size;
688 * int __cpu
689 * int pc;
690 *
691 * pc = preempt_count();
692 *
693 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
694 *
695 * // Below we want to get the aligned size by taking into account
696 * // the u32 field that will later store the buffer size
697 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
698 * sizeof(u64));
699 * __entry_size -= sizeof(u32);
700 *
701 * // Protect the non nmi buffer
702 * // This also protects the rcu read side
703 * local_irq_save(irq_flags);
704 * __cpu = smp_processor_id();
705 *
706 * if (in_nmi())
707 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
708 * else
709 * trace_buf = rcu_dereference_sched(perf_trace_buf);
710 *
711 * if (!trace_buf)
712 * goto end;
713 *
714 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
715 *
716 * // Avoid recursion from perf that could mess up the buffer
717 * if (trace_buf->recursion++)
718 * goto end_recursion;
719 *
720 * raw_data = trace_buf->buf;
721 *
722 * // Make recursion update visible before entering perf_tp_event
723 * // so that we protect from perf recursions.
724 *
725 * barrier();
726 *
727 * //zero dead bytes from alignment to avoid stack leak to userspace:
728 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
729 * entry = (struct ftrace_raw_<call> *)raw_data;
730 * ent = &entry->ent;
731 * tracing_generic_entry_update(ent, irq_flags, pc);
732 * ent->type = event_call->id;
733 *
734 * <tstruct> <- do some jobs with dynamic arrays
735 *
736 * <assign> <- affect our values
737 *
738 * perf_tp_event(event_call->id, __addr, __count, entry,
739 * __entry_size); <- submit them to perf counter
740 *
741 * }
742 */
743
744#ifdef CONFIG_PERF_EVENTS
745
746#undef __entry
747#define __entry entry
748
749#undef __get_dynamic_array
750#define __get_dynamic_array(field) \
751 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
752
753#undef __get_str
754#define __get_str(field) (char *)__get_dynamic_array(field)
755
756#undef __perf_addr
757#define __perf_addr(a) __addr = (a)
758
759#undef __perf_count
760#define __perf_count(c) __count = (c)
761
762#undef DECLARE_EVENT_CLASS
763#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
764static notrace void \
765perf_trace_##call(void *__data, proto) \
766{ \
767 struct ftrace_event_call *event_call = __data; \
768 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
769 struct ftrace_raw_##call *entry; \
770 struct pt_regs __regs; \
771 u64 __addr = 0, __count = 1; \
772 struct hlist_head *head; \
773 int __entry_size; \
774 int __data_size; \
775 int rctx; \
776 \
777 perf_fetch_caller_regs(&__regs); \
778 \
779 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
780 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
781 sizeof(u64)); \
782 __entry_size -= sizeof(u32); \
783 \
784 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
785 "profile buffer not large enough")) \
786 return; \
787 \
788 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
789 __entry_size, event_call->event.type, &__regs, &rctx); \
790 if (!entry) \
791 return; \
792 \
793 tstruct \
794 \
795 { assign; } \
796 \
797 head = this_cpu_ptr(event_call->perf_events); \
798 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
799 __count, &__regs, head); \
800}
801
802/*
803 * This part is compiled out, it is only here as a build time check
804 * to make sure that if the tracepoint handling changes, the
805 * perf probe will fail to compile unless it too is updated.
806 */
807#undef DEFINE_EVENT
808#define DEFINE_EVENT(template, call, proto, args) \
809static inline void perf_test_probe_##call(void) \
810{ \
811 check_trace_callback_type_##call(perf_trace_##template); \
812}
813
814
815#undef DEFINE_EVENT_PRINT
816#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
817 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
818
819#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
820#endif /* CONFIG_PERF_EVENTS */
821
822#undef _TRACE_PROFILE_INIT
1d12cebd 823#endif //0
LTTng 2.0/0.x modules
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