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Fix: ring buffer: get_subbuf() checks should be performed on "consumed" parameter
[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#include <linux/uaccess.h>
22#include <linux/debugfs.h>
23#include "lttng.h"
24#include "lttng-types.h"
25#include "lttng-probe-user.h"
26#include "../wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */
27#include "../wrapper/ringbuffer/frontend_types.h"
28#include "../lttng-events.h"
29#include "../lttng-tracer-core.h"
30
31/*
32 * Macro declarations used for all stages.
33 */
34
35/*
36 * LTTng name mapping macros. LTTng remaps some of the kernel events to
37 * enforce name-spacing.
38 */
39#undef TRACE_EVENT_MAP
40#define TRACE_EVENT_MAP(name, map, proto, args, tstruct, assign, print) \
41 DECLARE_EVENT_CLASS(map, \
42 PARAMS(proto), \
43 PARAMS(args), \
44 PARAMS(tstruct), \
45 PARAMS(assign), \
46 PARAMS(print)) \
47 DEFINE_EVENT_MAP(map, name, map, PARAMS(proto), PARAMS(args))
48
49#undef TRACE_EVENT_MAP_NOARGS
50#define TRACE_EVENT_MAP_NOARGS(name, map, tstruct, assign, print) \
51 DECLARE_EVENT_CLASS_NOARGS(map, \
52 PARAMS(tstruct), \
53 PARAMS(assign), \
54 PARAMS(print)) \
55 DEFINE_EVENT_MAP_NOARGS(map, name, map)
56
57#undef DEFINE_EVENT_PRINT_MAP
58#define DEFINE_EVENT_PRINT_MAP(template, name, map, proto, args, print) \
59 DEFINE_EVENT_MAP(template, name, map, PARAMS(proto), PARAMS(args))
60
61/* Callbacks are meaningless to LTTng. */
62#undef TRACE_EVENT_FN_MAP
63#define TRACE_EVENT_FN_MAP(name, map, proto, args, tstruct, \
64 assign, print, reg, unreg) \
65 TRACE_EVENT_MAP(name, map, PARAMS(proto), PARAMS(args), \
66 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
67
68#undef TRACE_EVENT_CONDITION_MAP
69#define TRACE_EVENT_CONDITION_MAP(name, map, proto, args, cond, tstruct, assign, print) \
70 TRACE_EVENT_MAP(name, map, \
71 PARAMS(proto), \
72 PARAMS(args), \
73 PARAMS(tstruct), \
74 PARAMS(assign), \
75 PARAMS(print))
76
77/*
78 * DECLARE_EVENT_CLASS can be used to add a generic function
79 * handlers for events. That is, if all events have the same
80 * parameters and just have distinct trace points.
81 * Each tracepoint can be defined with DEFINE_EVENT and that
82 * will map the DECLARE_EVENT_CLASS to the tracepoint.
83 *
84 * TRACE_EVENT is a one to one mapping between tracepoint and template.
85 */
86
87#undef TRACE_EVENT
88#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
89 TRACE_EVENT_MAP(name, name, \
90 PARAMS(proto), \
91 PARAMS(args), \
92 PARAMS(tstruct), \
93 PARAMS(assign), \
94 PARAMS(print))
95
96#undef TRACE_EVENT_NOARGS
97#define TRACE_EVENT_NOARGS(name, tstruct, assign, print) \
98 TRACE_EVENT_MAP_NOARGS(name, name, \
99 PARAMS(tstruct), \
100 PARAMS(assign), \
101 PARAMS(print))
102
103#undef DEFINE_EVENT_PRINT
104#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
105 DEFINE_EVENT_PRINT_MAP(template, name, name, \
106 PARAMS(proto), PARAMS(args), PARAMS(print_))
107
108#undef TRACE_EVENT_FN
109#define TRACE_EVENT_FN(name, proto, args, tstruct, \
110 assign, print, reg, unreg) \
111 TRACE_EVENT_FN_MAP(name, name, PARAMS(proto), PARAMS(args), \
112 PARAMS(tstruct), PARAMS(assign), PARAMS(print), \
113 PARAMS(reg), PARAMS(unreg)) \
114
115#undef DEFINE_EVENT
116#define DEFINE_EVENT(template, name, proto, args) \
117 DEFINE_EVENT_MAP(template, name, name, PARAMS(proto), PARAMS(args))
118
119#undef DEFINE_EVENT_NOARGS
120#define DEFINE_EVENT_NOARGS(template, name) \
121 DEFINE_EVENT_MAP_NOARGS(template, name, name)
122
123#undef TRACE_EVENT_CONDITION
124#define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \
125 TRACE_EVENT_CONDITION_MAP(name, name, \
126 PARAMS(proto), \
127 PARAMS(args), \
128 PARAMS(cond), \
129 PARAMS(tstruct), \
130 PARAMS(assign), \
131 PARAMS(print))
132
133/*
134 * Stage 1 of the trace events.
135 *
136 * Create dummy trace calls for each events, verifying that the LTTng module
137 * TRACE_EVENT headers match the kernel arguments. Will be optimized out by the
138 * compiler.
139 */
140
141#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
142
143#undef TP_PROTO
144#define TP_PROTO(args...) args
145
146#undef TP_ARGS
147#define TP_ARGS(args...) args
148
149#undef DEFINE_EVENT_MAP
150#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \
151void trace_##_name(_proto);
152
153#undef DEFINE_EVENT_MAP_NOARGS
154#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \
155void trace_##_name(void *__data);
156
157#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
158
159/*
160 * Stage 2 of the trace events.
161 *
162 * Create event field type metadata section.
163 * Each event produce an array of fields.
164 */
165
166#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
167
168/* Named field types must be defined in lttng-types.h */
169
170#undef __field_full
171#define __field_full(_type, _item, _order, _base) \
172 { \
173 .name = #_item, \
174 .type = __type_integer(_type, _order, _base, none), \
175 },
176
177#undef __field
178#define __field(_type, _item) \
179 __field_full(_type, _item, __BYTE_ORDER, 10)
180
181#undef __field_ext
182#define __field_ext(_type, _item, _filter_type) \
183 __field(_type, _item)
184
185#undef __field_hex
186#define __field_hex(_type, _item) \
187 __field_full(_type, _item, __BYTE_ORDER, 16)
188
189#undef __field_network
190#define __field_network(_type, _item) \
191 __field_full(_type, _item, __BIG_ENDIAN, 10)
192
193#undef __field_network_hex
194#define __field_network_hex(_type, _item) \
195 __field_full(_type, _item, __BIG_ENDIAN, 16)
196
197#undef __array_enc_ext
198#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
199 { \
200 .name = #_item, \
201 .type = \
202 { \
203 .atype = atype_array, \
204 .u.array = \
205 { \
206 .length = _length, \
207 .elem_type = __type_integer(_type, _order, _base, _encoding), \
208 }, \
209 }, \
210 },
211
212#undef __array
213#define __array(_type, _item, _length) \
214 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
215
216#undef __array_text
217#define __array_text(_type, _item, _length) \
218 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
219
220#undef __array_hex
221#define __array_hex(_type, _item, _length) \
222 __array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
223
224#undef __dynamic_array_enc_ext
225#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
226 { \
227 .name = #_item, \
228 .type = \
229 { \
230 .atype = atype_sequence, \
231 .u.sequence = \
232 { \
233 .length_type = __type_integer(u32, __BYTE_ORDER, 10, none), \
234 .elem_type = __type_integer(_type, _order, _base, _encoding), \
235 }, \
236 }, \
237 },
238
239#undef __dynamic_array
240#define __dynamic_array(_type, _item, _length) \
241 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, none)
242
243#undef __dynamic_array_text
244#define __dynamic_array_text(_type, _item, _length) \
245 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 10, UTF8)
246
247#undef __dynamic_array_hex
248#define __dynamic_array_hex(_type, _item, _length) \
249 __dynamic_array_enc_ext(_type, _item, _length, __BYTE_ORDER, 16, none)
250
251#undef __string
252#define __string(_item, _src) \
253 { \
254 .name = #_item, \
255 .type = \
256 { \
257 .atype = atype_string, \
258 .u.basic.string.encoding = lttng_encode_UTF8, \
259 }, \
260 },
261
262#undef __string_from_user
263#define __string_from_user(_item, _src) \
264 __string(_item, _src)
265
266#undef TP_STRUCT__entry
267#define TP_STRUCT__entry(args...) args /* Only one used in this phase */
268
269#undef DECLARE_EVENT_CLASS_NOARGS
270#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
271 static const struct lttng_event_field __event_fields___##_name[] = { \
272 _tstruct \
273 };
274
275#undef DECLARE_EVENT_CLASS
276#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
277 DECLARE_EVENT_CLASS_NOARGS(_name, PARAMS(_tstruct), PARAMS(_assign), \
278 PARAMS(_print))
279
280#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
281
282/*
283 * Stage 3 of the trace events.
284 *
285 * Create probe callback prototypes.
286 */
287
288#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
289
290#undef TP_PROTO
291#define TP_PROTO(args...) args
292
293#undef DECLARE_EVENT_CLASS
294#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
295static void __event_probe__##_name(void *__data, _proto);
296
297#undef DECLARE_EVENT_CLASS_NOARGS
298#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
299static void __event_probe__##_name(void *__data);
300
301#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
302
303/*
304 * Stage 3.9 of the trace events.
305 *
306 * Create event descriptions.
307 */
308
309/* Named field types must be defined in lttng-types.h */
310
311#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
312
313#ifndef TP_PROBE_CB
314#define TP_PROBE_CB(_template) &__event_probe__##_template
315#endif
316
317#undef DEFINE_EVENT_MAP_NOARGS
318#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \
319static const struct lttng_event_desc __event_desc___##_map = { \
320 .fields = __event_fields___##_template, \
321 .name = #_map, \
322 .probe_callback = (void *) TP_PROBE_CB(_template), \
323 .nr_fields = ARRAY_SIZE(__event_fields___##_template), \
324 .owner = THIS_MODULE, \
325};
326
327#undef DEFINE_EVENT_MAP
328#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \
329 DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)
330
331#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
332
333
334/*
335 * Stage 4 of the trace events.
336 *
337 * Create an array of event description pointers.
338 */
339
340/* Named field types must be defined in lttng-types.h */
341
342#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
343
344#undef DEFINE_EVENT_MAP_NOARGS
345#define DEFINE_EVENT_MAP_NOARGS(_template, _name, _map) \
346 &__event_desc___##_map,
347
348#undef DEFINE_EVENT_MAP
349#define DEFINE_EVENT_MAP(_template, _name, _map, _proto, _args) \
350 DEFINE_EVENT_MAP_NOARGS(_template, _name, _map)
351
352#define TP_ID1(_token, _system) _token##_system
353#define TP_ID(_token, _system) TP_ID1(_token, _system)
354
355static const struct lttng_event_desc *TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
356#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
357};
358
359#undef TP_ID1
360#undef TP_ID
361
362
363/*
364 * Stage 5 of the trace events.
365 *
366 * Create a toplevel descriptor for the whole probe.
367 */
368
369#define TP_ID1(_token, _system) _token##_system
370#define TP_ID(_token, _system) TP_ID1(_token, _system)
371
372/* non-const because list head will be modified when registered. */
373static __used struct lttng_probe_desc TP_ID(__probe_desc___, TRACE_SYSTEM) = {
374 .event_desc = TP_ID(__event_desc___, TRACE_SYSTEM),
375 .nr_events = ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)),
376};
377
378#undef TP_ID1
379#undef TP_ID
380
381/*
382 * Stage 6 of the trace events.
383 *
384 * Create static inline function that calculates event size.
385 */
386
387#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
388
389/* Named field types must be defined in lttng-types.h */
390
391#undef __field_full
392#define __field_full(_type, _item, _order, _base) \
393 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
394 __event_len += sizeof(_type);
395
396#undef __array_enc_ext
397#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
398 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
399 __event_len += sizeof(_type) * (_length);
400
401#undef __dynamic_array_enc_ext
402#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
403 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(u32)); \
404 __event_len += sizeof(u32); \
405 __event_len += lib_ring_buffer_align(__event_len, lttng_alignof(_type)); \
406 __dynamic_len[__dynamic_len_idx] = (_length); \
407 __event_len += sizeof(_type) * __dynamic_len[__dynamic_len_idx]; \
408 __dynamic_len_idx++;
409
410#undef __string
411#define __string(_item, _src) \
412 __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
413
414/*
415 * strlen_user includes \0. If returns 0, it faulted, so we set size to
416 * 1 (\0 only).
417 */
418#undef __string_from_user
419#define __string_from_user(_item, _src) \
420 __event_len += __dynamic_len[__dynamic_len_idx++] = \
421 max_t(size_t, lttng_strlen_user_inatomic(_src), 1);
422
423#undef TP_PROTO
424#define TP_PROTO(args...) args
425
426#undef TP_STRUCT__entry
427#define TP_STRUCT__entry(args...) args
428
429#undef DECLARE_EVENT_CLASS
430#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
431static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
432{ \
433 size_t __event_len = 0; \
434 unsigned int __dynamic_len_idx = 0; \
435 \
436 if (0) \
437 (void) __dynamic_len_idx; /* don't warn if unused */ \
438 _tstruct \
439 return __event_len; \
440}
441
442#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
443
444/*
445 * Stage 7 of the trace events.
446 *
447 * Create static inline function that calculates event payload alignment.
448 */
449
450#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
451
452/* Named field types must be defined in lttng-types.h */
453
454#undef __field_full
455#define __field_full(_type, _item, _order, _base) \
456 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
457
458#undef __array_enc_ext
459#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
460 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
461
462#undef __dynamic_array_enc_ext
463#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
464 __event_align = max_t(size_t, __event_align, lttng_alignof(u32)); \
465 __event_align = max_t(size_t, __event_align, lttng_alignof(_type));
466
467#undef __string
468#define __string(_item, _src)
469
470#undef __string_from_user
471#define __string_from_user(_item, _src)
472
473#undef TP_PROTO
474#define TP_PROTO(args...) args
475
476#undef TP_STRUCT__entry
477#define TP_STRUCT__entry(args...) args
478
479#undef DECLARE_EVENT_CLASS
480#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
481static inline size_t __event_get_align__##_name(_proto) \
482{ \
483 size_t __event_align = 1; \
484 _tstruct \
485 return __event_align; \
486}
487
488#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
489
490
491/*
492 * Stage 8 of the trace events.
493 *
494 * Create structure declaration that allows the "assign" macros to access the
495 * field types.
496 */
497
498#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
499
500/* Named field types must be defined in lttng-types.h */
501
502#undef __field_full
503#define __field_full(_type, _item, _order, _base) _type _item;
504
505#undef __array_enc_ext
506#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding) \
507 _type _item;
508
509#undef __dynamic_array_enc_ext
510#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
511 _type _item;
512
513#undef __string
514#define __string(_item, _src) char _item;
515
516#undef __string_from_user
517#define __string_from_user(_item, _src) \
518 __string(_item, _src)
519
520#undef TP_STRUCT__entry
521#define TP_STRUCT__entry(args...) args
522
523#undef DECLARE_EVENT_CLASS
524#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
525struct __event_typemap__##_name { \
526 _tstruct \
527};
528
529#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
530
531
532/*
533 * Stage 9 of the trace events.
534 *
535 * Create the probe function : call even size calculation and write event data
536 * into the buffer.
537 *
538 * We use both the field and assignment macros to write the fields in the order
539 * defined in the field declaration. The field declarations control the
540 * execution order, jumping to the appropriate assignment block.
541 */
542
543#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
544
545#undef __field_full
546#define __field_full(_type, _item, _order, _base) \
547 goto __assign_##_item; \
548__end_field_##_item:
549
550#undef __array_enc_ext
551#define __array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
552 goto __assign_##_item; \
553__end_field_##_item:
554
555#undef __dynamic_array_enc_ext
556#define __dynamic_array_enc_ext(_type, _item, _length, _order, _base, _encoding)\
557 goto __assign_##_item##_1; \
558__end_field_##_item##_1: \
559 goto __assign_##_item##_2; \
560__end_field_##_item##_2:
561
562#undef __string
563#define __string(_item, _src) \
564 goto __assign_##_item; \
565__end_field_##_item:
566
567#undef __string_from_user
568#define __string_from_user(_item, _src) \
569 __string(_item, _src)
570
571/*
572 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
573 * strcpy().
574 */
575#undef tp_assign
576#define tp_assign(dest, src) \
577__assign_##dest: \
578 { \
579 __typeof__(__typemap.dest) __tmp = (src); \
580 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__tmp)); \
581 __chan->ops->event_write(&__ctx, &__tmp, sizeof(__tmp));\
582 } \
583 goto __end_field_##dest;
584
585/* fixed length array memcpy */
586#undef tp_memcpy_gen
587#define tp_memcpy_gen(write_ops, dest, src, len) \
588__assign_##dest: \
589 if (0) \
590 (void) __typemap.dest; \
591 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
592 __chan->ops->write_ops(&__ctx, src, len); \
593 goto __end_field_##dest;
594
595#undef tp_memcpy
596#define tp_memcpy(dest, src, len) \
597 tp_memcpy_gen(event_write, dest, src, len)
598
599#undef tp_memcpy_from_user
600#define tp_memcpy_from_user(dest, src, len) \
601 tp_memcpy_gen(event_write_from_user, dest, src, len)
602
603/* variable length sequence memcpy */
604#undef tp_memcpy_dyn_gen
605#define tp_memcpy_dyn_gen(write_ops, dest, src) \
606__assign_##dest##_1: \
607 { \
608 u32 __tmpl = __dynamic_len[__dynamic_len_idx]; \
609 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(u32)); \
610 __chan->ops->event_write(&__ctx, &__tmpl, sizeof(u32)); \
611 } \
612 goto __end_field_##dest##_1; \
613__assign_##dest##_2: \
614 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest)); \
615 __chan->ops->write_ops(&__ctx, src, \
616 sizeof(__typemap.dest) * __get_dynamic_array_len(dest));\
617 goto __end_field_##dest##_2;
618
619#undef tp_memcpy_dyn
620#define tp_memcpy_dyn(dest, src) \
621 tp_memcpy_dyn_gen(event_write, dest, src)
622
623#undef tp_memcpy_dyn_from_user
624#define tp_memcpy_dyn_from_user(dest, src) \
625 tp_memcpy_dyn_gen(event_write_from_user, dest, src)
626
627/*
628 * The string length including the final \0.
629 */
630#undef tp_copy_string_from_user
631#define tp_copy_string_from_user(dest, src) \
632 __assign_##dest: \
633 { \
634 size_t __ustrlen; \
635 \
636 if (0) \
637 (void) __typemap.dest; \
638 lib_ring_buffer_align_ctx(&__ctx, lttng_alignof(__typemap.dest));\
639 __ustrlen = __get_dynamic_array_len(dest); \
640 if (likely(__ustrlen > 1)) { \
641 __chan->ops->event_write_from_user(&__ctx, src, \
642 __ustrlen - 1); \
643 } \
644 __chan->ops->event_memset(&__ctx, 0, 1); \
645 } \
646 goto __end_field_##dest;
647#undef tp_strcpy
648#define tp_strcpy(dest, src) \
649 tp_memcpy(dest, src, __get_dynamic_array_len(dest))
650
651/* Named field types must be defined in lttng-types.h */
652
653#undef __get_str
654#define __get_str(field) field
655
656#undef __get_dynamic_array
657#define __get_dynamic_array(field) field
658
659/* Beware: this get len actually consumes the len value */
660#undef __get_dynamic_array_len
661#define __get_dynamic_array_len(field) __dynamic_len[__dynamic_len_idx++]
662
663#undef TP_PROTO
664#define TP_PROTO(args...) args
665
666#undef TP_ARGS
667#define TP_ARGS(args...) args
668
669#undef TP_STRUCT__entry
670#define TP_STRUCT__entry(args...) args
671
672#undef TP_fast_assign
673#define TP_fast_assign(args...) args
674
675/*
676 * For state dump, check that "session" argument (mandatory) matches the
677 * session this event belongs to. Ensures that we write state dump data only
678 * into the started session, not into all sessions.
679 */
680#ifdef TP_SESSION_CHECK
681#define _TP_SESSION_CHECK(session, csession) (session == csession)
682#else /* TP_SESSION_CHECK */
683#define _TP_SESSION_CHECK(session, csession) 1
684#endif /* TP_SESSION_CHECK */
685
686#undef DECLARE_EVENT_CLASS
687#define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
688static void __event_probe__##_name(void *__data, _proto) \
689{ \
690 struct lttng_event *__event = __data; \
691 struct lttng_channel *__chan = __event->chan; \
692 struct lib_ring_buffer_ctx __ctx; \
693 size_t __event_len, __event_align; \
694 size_t __dynamic_len_idx = 0; \
695 size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \
696 struct __event_typemap__##_name __typemap; \
697 int __ret; \
698 \
699 if (0) { \
700 (void) __dynamic_len_idx; /* don't warn if unused */ \
701 (void) __typemap; /* don't warn if unused */ \
702 } \
703 if (!_TP_SESSION_CHECK(session, __chan->session)) \
704 return; \
705 if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
706 return; \
707 if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
708 return; \
709 if (unlikely(!ACCESS_ONCE(__event->enabled))) \
710 return; \
711 __event_len = __event_get_size__##_name(__dynamic_len, _args); \
712 __event_align = __event_get_align__##_name(_args); \
713 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
714 __event_align, -1); \
715 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
716 if (__ret < 0) \
717 return; \
718 /* Control code (field ordering) */ \
719 _tstruct \
720 __chan->ops->event_commit(&__ctx); \
721 return; \
722 /* Copy code, steered by control code */ \
723 _assign \
724}
725
726#undef DECLARE_EVENT_CLASS_NOARGS
727#define DECLARE_EVENT_CLASS_NOARGS(_name, _tstruct, _assign, _print) \
728static void __event_probe__##_name(void *__data) \
729{ \
730 struct lttng_event *__event = __data; \
731 struct lttng_channel *__chan = __event->chan; \
732 struct lib_ring_buffer_ctx __ctx; \
733 size_t __event_len, __event_align; \
734 int __ret; \
735 \
736 if (!_TP_SESSION_CHECK(session, __chan->session)) \
737 return; \
738 if (unlikely(!ACCESS_ONCE(__chan->session->active))) \
739 return; \
740 if (unlikely(!ACCESS_ONCE(__chan->enabled))) \
741 return; \
742 if (unlikely(!ACCESS_ONCE(__event->enabled))) \
743 return; \
744 __event_len = 0; \
745 __event_align = 1; \
746 lib_ring_buffer_ctx_init(&__ctx, __chan->chan, __event, __event_len, \
747 __event_align, -1); \
748 __ret = __chan->ops->event_reserve(&__ctx, __event->id); \
749 if (__ret < 0) \
750 return; \
751 /* Control code (field ordering) */ \
752 _tstruct \
753 __chan->ops->event_commit(&__ctx); \
754 return; \
755 /* Copy code, steered by control code */ \
756 _assign \
757}
758
759#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
760
761/*
762 * Stage 10 of the trace events.
763 *
764 * Register/unregister probes at module load/unload.
765 */
766
767#include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
768
769#define TP_ID1(_token, _system) _token##_system
770#define TP_ID(_token, _system) TP_ID1(_token, _system)
771#define module_init_eval1(_token, _system) module_init(_token##_system)
772#define module_init_eval(_token, _system) module_init_eval1(_token, _system)
773#define module_exit_eval1(_token, _system) module_exit(_token##_system)
774#define module_exit_eval(_token, _system) module_exit_eval1(_token, _system)
775
776#ifndef TP_MODULE_NOINIT
777static int TP_ID(__lttng_events_init__, TRACE_SYSTEM)(void)
778{
779 wrapper_vmalloc_sync_all();
780 return lttng_probe_register(&TP_ID(__probe_desc___, TRACE_SYSTEM));
781}
782
783static void TP_ID(__lttng_events_exit__, TRACE_SYSTEM)(void)
784{
785 lttng_probe_unregister(&TP_ID(__probe_desc___, TRACE_SYSTEM));
786}
787
788#ifndef TP_MODULE_NOAUTOLOAD
789module_init_eval(__lttng_events_init__, TRACE_SYSTEM);
790module_exit_eval(__lttng_events_exit__, TRACE_SYSTEM);
791#endif
792
793#endif
794
795#undef module_init_eval
796#undef module_exit_eval
797#undef TP_ID1
798#undef TP_ID
799
800#undef TP_PROTO
801#undef TP_ARGS
802#undef TRACE_EVENT_FLAGS
LTTng 2.0/0.x modules
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