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License cleanup, ifdef namespace cleanup
[lttng-modules.git] / probes / lttng-events.h
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1/*
2 * lttng-events.h
3 *
4 * Copyright (C) 2009 Steven Rostedt <rostedt@goodmis.org>
5 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; only
10 * version 2.1 of the License.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include <linux/debugfs.h>
23#include "lttng.h"
24#include "lttng-types.h"
25#include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
26#include "../wrapper/ringbuffer/frontend_types.h"
27#include "../lttng-events.h"
28#include "../lttng-tracer-core.h"
29
30/*
31 * Macro declarations used for all stages.
32 */
33
34/*
35 * DECLARE_EVENT_CLASS can be used to add a generic function
36 * handlers for events. That is, if all events have the same
37 * parameters and just have distinct trace points.
38 * Each tracepoint can be defined with DEFINE_EVENT and that
39 * will map the DECLARE_EVENT_CLASS to the tracepoint.
40 *
41 * TRACE_EVENT is a one to one mapping between tracepoint and template.
42 */
43
44#undef TRACE_EVENT
45#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
46 DECLARE_EVENT_CLASS(name, \
47 PARAMS(proto), \
48 PARAMS(args), \
49 PARAMS(tstruct), \
50 PARAMS(assign), \
51 PARAMS(print)) \
52 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
53
54#undef TRACE_EVENT_NOARGS
55#define TRACE_EVENT_NOARGS(name, tstruct, assign, print) \
56 DECLARE_EVENT_CLASS_NOARGS(name, \
57 PARAMS(tstruct), \
58 PARAMS(assign), \
59 PARAMS(print)) \
60 DEFINE_EVENT_NOARGS(name, name)
61
62
63#undef DEFINE_EVENT_PRINT
64#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
65 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
66
67/* Callbacks are meaningless to LTTng. */
68#undef TRACE_EVENT_FN
69#define TRACE_EVENT_FN(name, proto, args, tstruct, \
70 assign, print, reg, unreg) \
71 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
72 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
73
74/*
75 * Stage 1 of the trace events.
76 *
77 * Create dummy trace calls for each events, verifying that the LTTng module
78 * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
79 * compiler.
80 */
81
82#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
83
84#undef TP_PROTO
85#define TP_PROTO(args...) args
86
87#undef TP_ARGS
88#define TP_ARGS(args...) args
89
90#undef DEFINE_EVENT
91#define DEFINE_EVENT(_template, _name, _proto, _args) \
92void trace_##_name(_proto);
93
94#undef DEFINE_EVENT_NOARGS
95#define DEFINE_EVENT_NOARGS(_template, _name) \
96void trace_##_name(void *__data);
97
98#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
99
100/*
101 * Stage 2 of the trace events.
102 *
103 * Create event field type metadata section.
104 * Each event produce an array of fields.
105 */
106
107#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
108
109/* Named field types must be defined in lttng-types.h */
110
111#undef __field_full
112#define __field_full(_type, _item, _order, _base) \
113 { \
114 .name = #_item, \
115 .type = __type_integer(_type, _order, _base, none), \
116 },
117
118#undef __field
119#define __field(_type, _item) \
120 __field_full(_type, _item, __BYTE_ORDER, 10)
121
122#undef __field_ext
123#define __field_ext(_type, _item, _filter_type) \
124 __field(_type, _item)
125
126#undef __field_hex
127#define __field_hex(_type, _item) \
128 __field_full(_type, _item, __BYTE_ORDER, 16)
129
130#undef __field_network
131#define __field_network(_type, _item) \
132 __field_full(_type, _item, __BIG_ENDIAN, 10)
133
134#undef __field_network_hex
135#define __field_network_hex(_type, _item) \
136 __field_full(_type, _item, __BIG_ENDIAN, 16)
137
138#undef __array_enc_ext
139#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
140 { \
141 .name = #_item, \
142 .type = \
143 { \
144 .atype = atype_array, \
145 .u.array = \
146 { \
147 .length = _length, \
148 .elem_type = __type_integer(_type, _order, _base, _encoding), \
149 }, \
150 }, \
151 },
152
153#undef __array
154#define __array(_type, _item, _length) \
155 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
156
157#undef __array_text
158#define __array_text(_type, _item, _length) \
159 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
160
161#undef __array_hex
162#define __array_hex(_type, _item, _length) \
163 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
164
165#undef __dynamic_array_enc_ext
166#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
167 { \
168 .name = #_item, \
169 .type = \
170 { \
171 .atype = atype_sequence, \
172 .u.sequence = \
173 { \
174 .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \
175 .elem_type = __type_integer(_type, _order, _base, _encoding), \
176 }, \
177 }, \
178 },
179
180#undef __dynamic_array
181#define __dynamic_array(_type, _item, _length) \
182 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
183
184#undef __dynamic_array_text
185#define __dynamic_array_text(_type, _item, _length) \
186 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
187
188#undef __dynamic_array_hex
189#define __dynamic_array_hex(_type, _item, _length) \
190 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
191
192#undef __string
193#define __string(_item, _src) \
194 { \
195 .name = #_item, \
196 .type = \
197 { \
198 .atype = atype_string, \
199 .u.basic.string.encoding = lttng_encode_UTF8, \
200 }, \
201 },
202
203#undef __string_from_user
204#define __string_from_user(_item, _src) \
205 __string(_item, _src)
206
207#undef TP_STRUCT__entry
208#define TP_STRUCT__entry(args...) args /* Only one used in this phase */
209
210#undef DECLARE_EVENT_CLASS_NOARGS
211#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
212 static const struct lttng_event_field __event_fields___##_name[] = { \
213 _tstruct \
214 };
215
216#undef DECLARE_EVENT_CLASS
217#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
218 DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
219 PARAMS(_print))
220
221#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
222
223/*
224 * Stage 3 of the trace events.
225 *
226 * Create probe callback prototypes.
227 */
228
229#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
230
231#undef TP_PROTO
232#define TP_PROTO(args...) args
233
234#undef DECLARE_EVENT_CLASS
235#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
236static void __event_probe__##_name(void *__data, _proto);
237
238#undef DECLARE_EVENT_CLASS_NOARGS
239#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
240static void __event_probe__##_name(void *__data);
241
242#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
243
244/*
245 * Stage 3.9 of the trace events.
246 *
247 * Create event descriptions.
248 */
249
250/* Named field types must be defined in lttng-types.h */
251
252#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
253
254#ifndef TP_PROBE_CB
255#define TP_PROBE_CB(_template) &__event_probe__##_template
256#endif
257
258#undef DEFINE_EVENT_NOARGS
259#define DEFINE_EVENT_NOARGS(_template, _name) \
260static const struct lttng_event_desc __event_desc___##_name = { \
261 .fields = __event_fields___##_template, \
262 .name = #_name, \
263 .probe_callback = (void *) TP_PROBE_CB(_template), \
264 .nr_fields = ARRAY_SIZE(__event_fields___##_template), \
265 .owner = THIS_MODULE, \
266};
267
268#undef DEFINE_EVENT
269#define DEFINE_EVENT(_template, _name, _proto, _args) \
270 DEFINE_EVENT_NOARGS(_template, _name)
271
272#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
273
274
275/*
276 * Stage 4 of the trace events.
277 *
278 * Create an array of event description pointers.
279 */
280
281/* Named field types must be defined in lttng-types.h */
282
283#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
284
285#undef DEFINE_EVENT_NOARGS
286#define DEFINE_EVENT_NOARGS(_template, _name) \
287 &__event_desc___##_name,
288
289#undef DEFINE_EVENT
290#define DEFINE_EVENT(_template, _name, _proto, _args) \
291 DEFINE_EVENT_NOARGS(_template, _name)
292
293#define TP_ID1(_token, _system) _token##_system
294#define TP_ID(_token, _system) TP_ID1(_token, _system)
295
296static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
297#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
298};
299
300#undef TP_ID1
301#undef TP_ID
302
303
304/*
305 * Stage 5 of the trace events.
306 *
307 * Create a toplevel descriptor for the whole probe.
308 */
309
310#define TP_ID1(_token, _system) _token##_system
311#define TP_ID(_token, _system) TP_ID1(_token, _system)
312
313/* non-const because list head will be modified when registered. */
314static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
315 .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
316 .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
317};
318
319#undef TP_ID1
320#undef TP_ID
321
322/*
323 * Stage 6 of the trace events.
324 *
325 * Create static inline function that calculates event size.
326 */
327
328#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
329
330/* Named field types must be defined in lttng-types.h */
331
332#undef __field_full
333#define __field_full(_type, _item, _order, _base) \
334 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
335 __event_len += sizeof(_type);
336
337#undef __array_enc_ext
338#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
339 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
340 __event_len += sizeof(_type) * (_length);
341
342#undef __dynamic_array_enc_ext
343#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
344 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32)); \
345 __event_len += sizeof(u32); \
346 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
347 __dynamic_len[__dynamic_len_idx] = (_length); \
348 __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \
349 __dynamic_len_idx++;
350
351#undef __string
352#define __string(_item, _src) \
353 __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
354
355/*
356 * strlen_user includes \0. If returns 0, it faulted, so we set size to
357 * 1 (\0 only).
358 */
359#undef __string_from_user
360#define __string_from_user(_item, _src) \
361 __event_len += __dynamic_len[__dynamic_len_idx++] = \
362 max_t(size_t, strlen_user(_src), 1);
363
364#undef TP_PROTO
365#define TP_PROTO(args...) args
366
367#undef TP_STRUCT__entry
368#define TP_STRUCT__entry(args...) args
369
370#undef DECLARE_EVENT_CLASS
371#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
372static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
373{ \
374 size_t __event_len = 0; \
375 unsigned int __dynamic_len_idx = 0; \
376 \
377 if (0) \
378 (void) __dynamic_len_idx; /* don't warn if unused */ \
379 _tstruct \
380 return __event_len; \
381}
382
383#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
384
385/*
386 * Stage 7 of the trace events.
387 *
388 * Create static inline function that calculates event payload alignment.
389 */
390
391#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
392
393/* Named field types must be defined in lttng-types.h */
394
395#undef __field_full
396#define __field_full(_type, _item, _order, _base) \
397 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
398
399#undef __array_enc_ext
400#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
401 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
402
403#undef __dynamic_array_enc_ext
404#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
405 __event_align = max_t(size_t, __event_align, lttng_alignof(u32)); \
406 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
407
408#undef __string
409#define __string(_item, _src)
410
411#undef __string_from_user
412#define __string_from_user(_item, _src)
413
414#undef TP_PROTO
415#define TP_PROTO(args...) args
416
417#undef TP_STRUCT__entry
418#define TP_STRUCT__entry(args...) args
419
420#undef DECLARE_EVENT_CLASS
421#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
422static inline size_t __event_get_align__##_name(_proto) \
423{ \
424 size_t __event_align = 1; \
425 _tstruct \
426 return __event_align; \
427}
428
429#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
430
431
432/*
433 * Stage 8 of the trace events.
434 *
435 * Create structure declaration that allows the "assign" macros to access the
436 * field types.
437 */
438
439#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
440
441/* Named field types must be defined in lttng-types.h */
442
443#undef __field_full
444#define __field_full(_type, _item, _order, _base) _type _item;
445
446#undef __array_enc_ext
447#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
448 _type _item;
449
450#undef __dynamic_array_enc_ext
451#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
452 _type _item;
453
454#undef __string
455#define __string(_item, _src) char _item;
456
457#undef __string_from_user
458#define __string_from_user(_item, _src) \
459 __string(_item, _src)
460
461#undef TP_STRUCT__entry
462#define TP_STRUCT__entry(args...) args
463
464#undef DECLARE_EVENT_CLASS
465#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
466struct __event_typemap__##_name { \
467 _tstruct \
468};
469
470#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
471
472
473/*
474 * Stage 9 of the trace events.
475 *
476 * Create the probe function : call even size calculation and write event data
477 * into the buffer.
478 *
479 * We use both the field and assignment macros to write the fields in the order
480 * defined in the field declaration. The field declarations control the
481 * execution order, jumping to the appropriate assignment block.
482 */
483
484#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
485
486#undef __field_full
487#define __field_full(_type, _item, _order, _base) \
488 goto __assign_##_item; \
489__end_field_##_item:
490
491#undef __array_enc_ext
492#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
493 goto __assign_##_item; \
494__end_field_##_item:
495
496#undef __dynamic_array_enc_ext
497#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
498 goto __assign_##_item##_1; \
499__end_field_##_item##_1: \
500 goto __assign_##_item##_2; \
501__end_field_##_item##_2:
502
503#undef __string
504#define __string(_item, _src) \
505 goto __assign_##_item; \
506__end_field_##_item:
507
508#undef __string_from_user
509#define __string_from_user(_item, _src) \
510 __string(_item, _src)
511
512/*
513 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
514 * strcpy().
515 */
516#undef tp_assign
517#define tp_assign(dest, src) \
518__assign_##dest: \
519 { \
520 __typeof__(__typemap.dest) __tmp = (src); \
521 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp)); \
522 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
523 } \
524 goto __end_field_##dest;
525
526#undef tp_memcpy
527#define tp_memcpy(dest, src, len) \
528__assign_##dest: \
529 if (0) \
530 (void) __typemap.dest; \
531 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
532 __chan->ops->event_write(&__ctx, src, len); \
533 goto __end_field_##dest;
534
535#undef tp_memcpy_dyn
536#define tp_memcpy_dyn(dest, src) \
537__assign_##dest##_1: \
538 { \
539 u32 __tmpl = __dynamic_len[__dynamic_len_idx]; \
540 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32)); \
541 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
542 } \
543 goto __end_field_##dest##_1; \
544__assign_##dest##_2: \
545 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
546 __chan->ops->event_write(&__ctx, src, \
547 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
548 goto __end_field_##dest##_2;
549
550#undef tp_memcpy_from_user
551#define tp_memcpy_from_user(dest, src, len) \
552 __assign_##dest: \
553 if (0) \
554 (void) __typemap.dest; \
555 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
556 __chan->ops->event_write_from_user(&__ctx, src, len); \
557 goto __end_field_##dest;
558
559/*
560 * The string length including the final \0.
561 */
562#undef tp_copy_string_from_user
563#define tp_copy_string_from_user(dest, src) \
564 __assign_##dest: \
565 { \
566 size_t __ustrlen; \
567 \
568 if (0) \
569 (void) __typemap.dest; \
570 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\
571 __ustrlen = __get_dynamic_array_len(dest); \
572 if (likely(__ustrlen > 1)) { \
573 __chan->ops->event_write_from_user(&__ctx, src, \
574 __ustrlen - 1); \
575 } \
576 __chan->ops->event_memset(&__ctx, 0, 1); \
577 } \
578 goto __end_field_##dest;
579#undef tp_strcpy
580#define tp_strcpy(dest, src) \
581 tp_memcpy(dest, src, __get_dynamic_array_len(dest))
582
583/* Named field types must be defined in lttng-types.h */
584
585#undef __get_str
586#define __get_str(field) field
587
588#undef __get_dynamic_array
589#define __get_dynamic_array(field) field
590
591/* Beware: this get len actually consumes the len value */
592#undef __get_dynamic_array_len
593#define __get_dynamic_array_len(field) __dynamic_len[__dynamic_len_idx++]
594
595#undef TP_PROTO
596#define TP_PROTO(args...) args
597
598#undef TP_ARGS
599#define TP_ARGS(args...) args
600
601#undef TP_STRUCT__entry
602#define TP_STRUCT__entry(args...) args
603
604#undef TP_fast_assign
605#define TP_fast_assign(args...) args
606
607/*
608 * For state dump, check that "session" argument (mandatory) matches the
609 * session this event belongs to. Ensures that we write state dump data only
610 * into the started session, not into all sessions.
611 */
612#ifdef TP_SESSION_CHECK
613#define _TP_SESSION_CHECK(session, csession) (session == csession)
614#else /* TP_SESSION_CHECK */
615#define _TP_SESSION_CHECK(session, csession) 1
616#endif /* TP_SESSION_CHECK */
617
618#undef DECLARE_EVENT_CLASS
619#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
620static void __event_probe__##_name(void *__data, _proto) \
621{ \
622 struct lttng_event *__event = __data; \
623 struct lttng_channel *__chan = __event->chan; \
624 struct lib_ring_buffer_ctx __ctx; \
625 size_t __event_len, __event_align; \
626 size_t __dynamic_len_idx = 0; \
627 size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \
628 struct __event_typemap__##_name __typemap; \
629 int __ret; \
630 \
631 if (0) { \
632 (void) __dynamic_len_idx; /* don't warn if unused */ \
633 (void) __typemap; /* don't warn if unused */ \
634 } \
635 if (!_TP_SESSION_CHECK(session, __chan->session)) \
636 return; \
637 if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
638 return; \
639 if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
640 return; \
641 if (unlikely(!ACCESS_ONCE(__event->enabled))) \
642 return; \
643 __event_len = __event_get_size__##_name(__dynamic_len, _args); \
644 __event_align = __event_get_align__##_name(_args); \
645 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
646 __event_align, -1); \
647 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
648 if (__ret < 0) \
649 return; \
650 /* Control code (field ordering) */ \
651 _tstruct \
652 __chan->ops->event_commit(&__ctx); \
653 return; \
654 /* Copy code, steered by control code */ \
655 _assign \
656}
657
658#undef DECLARE_EVENT_CLASS_NOARGS
659#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
660static void __event_probe__##_name(void *__data) \
661{ \
662 struct lttng_event *__event = __data; \
663 struct lttng_channel *__chan = __event->chan; \
664 struct lib_ring_buffer_ctx __ctx; \
665 size_t __event_len, __event_align; \
666 int __ret; \
667 \
668 if (!_TP_SESSION_CHECK(session, __chan->session)) \
669 return; \
670 if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
671 return; \
672 if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
673 return; \
674 if (unlikely(!ACCESS_ONCE(__event->enabled))) \
675 return; \
676 __event_len = 0; \
677 __event_align = 1; \
678 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
679 __event_align, -1); \
680 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
681 if (__ret < 0) \
682 return; \
683 /* Control code (field ordering) */ \
684 _tstruct \
685 __chan->ops->event_commit(&__ctx); \
686 return; \
687 /* Copy code, steered by control code */ \
688 _assign \
689}
690
691#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
692
693/*
694 * Stage 10 of the trace events.
695 *
696 * Register/unregister probes at module load/unload.
697 */
698
699#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
700
701#define TP_ID1(_token, _system) _token##_system
702#define TP_ID(_token, _system) TP_ID1(_token, _system)
703#define module_init_eval1(_token, _system) module_init(_token##_system)
704#define module_init_eval(_token, _system) module_init_eval1(_token, _system)
705#define module_exit_eval1(_token, _system) module_exit(_token##_system)
706#define module_exit_eval(_token, _system) module_exit_eval1(_token, _system)
707
708#ifndef TP_MODULE_OVERRIDE
709static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
710{
711 wrapper_vmalloc_sync_all();
712 return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
713}
714
715module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
716
717static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
718{
719 lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
720}
721
722module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
723#endif
724
725#undef module_init_eval
726#undef module_exit_eval
727#undef TP_ID1
728#undef TP_ID
729
730#undef TP_PROTO
731#undef TP_ARGS
732#undef TRACE_EVENT_FLAGS
LTTng 2.0/0.x modules
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