projects / deliverable / lttng-modules.git / blob
? search:


0c25b955392b8277c6811538d6ab719992798e0d
[deliverable/lttng-modules.git] / probes / lttng-events.h
1 #include <lttng.h>
2 #include <lttng-types.h>
3 #include <linux/debugfs.h>
4
5 /*
6 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
7 * strcpy().
8 */
9 #undef tp_assign
10 #define tp_assign(dest, src) \
11 lib_ring_buffer_align_ctx(config, &ctx, sizeof(src)); \
12 lib_ring_buffer_write(config, &ctx, &src, sizeof(src));
13
14 #undef tp_memcpy
15 #define tp_memcpy(dest, src, len) \
16 lib_ring_buffer_align_ctx(config, &ctx, sizeof(*(src))); \
17 lib_ring_buffer_write(config, &ctx, &src, len);
18
19 /* TODO */
20 #undef tp_strcpy
21 #define tp_strcpy(dest, src) __assign_str(dest, src);
22
23 struct lttng_event_field {
24 const char *name;
25 const struct lttng_type type;
26 };
27
28 struct lttng_event_desc {
29 const struct lttng_event_field *fields;
30 const char *name;
31 unsigned int nr_fields;
32 };
33
34 /*
35 * Stage 1 of the trace events.
36 *
37 * Create event field type metadata section.
38 * Each event produce an array of fields.
39 */
40
41 /*
42 * DECLARE_EVENT_CLASS can be used to add a generic function
43 * handlers for events. That is, if all events have the same
44 * parameters and just have distinct trace points.
45 * Each tracepoint can be defined with DEFINE_EVENT and that
46 * will map the DECLARE_EVENT_CLASS to the tracepoint.
47 *
48 * TRACE_EVENT is a one to one mapping between tracepoint and template.
49 */
50 #undef TRACE_EVENT
51 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
52 DECLARE_EVENT_CLASS(name, \
53 PARAMS(proto), \
54 PARAMS(args), \
55 PARAMS(tstruct), \
56 PARAMS(assign), \
57 PARAMS(print)) \
58 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
59
60 /* Named field types must be defined in lttng-types.h */
61
62 #undef __field
63 #define __field(_type, _item) \
64 { .name = #_item, .type = { .atype = atype_integer, .name = #_type} },
65
66 #undef __field_ext
67 #define __field_ext(_type, _item, _filter_type) \
68 { .name = #_item, .type = { .atype = atype_integer, .name = #_type} },
69
70 #undef __array
71 #define __array(_type, _item, _length) \
72 { \
73 .name = #_item, \
74 .type = { \
75 .atype = atype_array, \
76 .name = NULL, \
77 .u.array.elem_type = #_type, \
78 .u.array.length = _length, \
79 }, \
80 },
81
82 #undef __dynamic_array
83 #define __dynamic_array(_type, _item, _length) \
84 { \
85 .name = #_item, \
86 .type = { \
87 .atype = atype_sequence, \
88 .name = NULL, \
89 .u.sequence.elem_type = #_type, \
90 .u.sequence.length_type = "u32", \
91 }, \
92 },
93
94 #undef __string
95 #define __string(_item, _src) \
96 { \
97 .name = _item, \
98 .type = { \
99 .atype = atype_string, \
100 .name = NULL, \
101 .u.string.encoding = lttng_encode_UTF8, \
102 }, \
103 },
104
105 #undef TP_PROTO
106 #define TP_PROTO(args...)
107
108 #undef TP_ARGS
109 #define TP_ARGS(args...)
110
111 #undef TP_STRUCT__entry
112 #define TP_STRUCT__entry(args...) args /* Only one used in this phase */
113
114 #undef TP_fast_assign
115 #define TP_fast_assign(args...)
116
117 #undef TP_printk
118 #define TP_printk(args...)
119
120 #undef DECLARE_EVENT_CLASS
121 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
122 static const struct lttng_event_field __event_fields___##name[] = { \
123 tstruct \
124 };
125
126 #undef DEFINE_EVENT
127 #define DEFINE_EVENT(template, name, proto, args)
128
129 #undef DEFINE_EVENT_PRINT
130 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
131 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
132
133 /* Callbacks are meaningless to LTTng. */
134 #undef TRACE_EVENT_FN
135 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
136 assign, print, reg, unreg) \
137 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
138 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
139
140 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
141
142 /*
143 * Stage 2 of the trace events.
144 *
145 * Create an array of events.
146 */
147
148 /*
149 * DECLARE_EVENT_CLASS can be used to add a generic function
150 * handlers for events. That is, if all events have the same
151 * parameters and just have distinct trace points.
152 * Each tracepoint can be defined with DEFINE_EVENT and that
153 * will map the DECLARE_EVENT_CLASS to the tracepoint.
154 *
155 * TRACE_EVENT is a one to one mapping between tracepoint and template.
156 */
157 #undef TRACE_EVENT
158 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
159 DECLARE_EVENT_CLASS(name, \
160 PARAMS(proto), \
161 PARAMS(args), \
162 PARAMS(tstruct), \
163 PARAMS(assign), \
164 PARAMS(print)) \
165 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
166
167 /* Named field types must be defined in lttng-types.h */
168
169 #undef __field
170 #define __field(_type, _item)
171
172 #undef __field_ext
173 #define __field_ext(_type, _item, _filter_type)
174
175 #undef __array
176 #define __array(_type, _item, _length)
177
178 #undef __dynamic_array
179 #define __dynamic_array(_type, _item, _length)
180
181 #undef __string
182 #define __string(_item, _src)
183
184 #undef TP_PROTO
185 #define TP_PROTO(args...)
186
187 #undef TP_ARGS
188 #define TP_ARGS(args...)
189
190 #undef TP_STRUCT__entry
191 #define TP_STRUCT__entry(args...)
192
193 #undef TP_fast_assign
194 #define TP_fast_assign(args...)
195
196 #undef TP_printk
197 #define TP_printk(args...)
198
199 #undef DECLARE_EVENT_CLASS
200 #define DECLARE_EVENT_CLASS(_name, proto, args, tstruct, assign, print) \
201 { \
202 .fields = __event_fields___##_name, \
203 .name = #_name, \
204 .nr_fields = ARRAY_SIZE(__event_fields___##_name), \
205 },
206
207 #undef DEFINE_EVENT
208 #define DEFINE_EVENT(template, name, proto, args)
209
210 #undef DEFINE_EVENT_PRINT
211 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
212 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
213
214 /* Callbacks are meaningless to LTTng. */
215 #undef TRACE_EVENT_FN
216 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
217 assign, print, reg, unreg) \
218 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
219 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
220
221 #define TP_ID1(_token, _system) _token##_system
222 #define TP_ID(_token, _system) TP_ID1(_token, _system)
223
224 static const struct lttng_event_desc TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
225 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
226 };
227
228 #undef TP_ID1
229 #undef TP_ID
230
231 /*
232 * Stage 3 of the trace events.
233 *
234 * Create seq file metadata output.
235 */
236
237 /*
238 * DECLARE_EVENT_CLASS can be used to add a generic function
239 * handlers for events. That is, if all events have the same
240 * parameters and just have distinct trace points.
241 * Each tracepoint can be defined with DEFINE_EVENT and that
242 * will map the DECLARE_EVENT_CLASS to the tracepoint.
243 *
244 * TRACE_EVENT is a one to one mapping between tracepoint and template.
245 */
246 #undef TRACE_EVENT
247 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
248 DECLARE_EVENT_CLASS(name, \
249 PARAMS(proto), \
250 PARAMS(args), \
251 PARAMS(tstruct), \
252 PARAMS(assign), \
253 PARAMS(print)) \
254 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
255
256 /* Named field types must be defined in lttng-types.h */
257
258 #undef __field
259 #define __field(_type, _item)
260
261 #undef __field_ext
262 #define __field_ext(_type, _item, _filter_type)
263
264 #undef __array
265 #define __array(_type, _item, _length)
266
267 #undef __dynamic_array
268 #define __dynamic_array(_type, _item, _length)
269
270 #undef __string
271 #define __string(_item, _src)
272
273 #undef TP_PROTO
274 #define TP_PROTO(args...)
275
276 #undef TP_ARGS
277 #define TP_ARGS(args...)
278
279 #undef TP_STRUCT__entry
280 #define TP_STRUCT__entry(args...)
281
282 #undef TP_fast_assign
283 #define TP_fast_assign(args...)
284
285 #undef TP_printk
286 #define TP_printk(args...)
287
288 #undef DECLARE_EVENT_CLASS
289 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
290 static void ()
291
292 #undef DEFINE_EVENT
293 #define DEFINE_EVENT(template, name, proto, args)
294
295 #undef DEFINE_EVENT_PRINT
296 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
297 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
298
299 /* Callbacks are meaningless to LTTng. */
300 #undef TRACE_EVENT_FN
301 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
302 assign, print, reg, unreg) \
303 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
304 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
305
306 #define TP_ID1(_token, _system) _token##_system
307 #define TP_ID(_token, _system) TP_ID1(_token, _system)
308 #define module_init_eval1(_token, _system) module_init(_token##_system)
309 #define module_init_eval(_token, _system) module_init_eval1(_token, _system)
310 #define module_exit_eval1(_token, _system) module_exit(_token##_system)
311 #define module_exit_eval(_token, _system) module_exit_eval1(_token, _system)
312
313 static void *TP_ID(__lttng_seq_start__, TRACE_SYSTEM)(struct seq_file *m,
314 loff_t *pos)
315 {
316 const struct lttng_event_desc *desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[*pos];
317
318 if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM)[ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1])
319 return NULL;
320 return (void *) desc;
321 }
322
323 static void *TP_ID(__lttng_seq_next__, TRACE_SYSTEM)(struct seq_file *m,
324 void *p, loff_t *ppos)
325 {
326 const struct lttng_event_desc *desc = &TP_ID(__event_desc___, TRACE_SYSTEM)[++(*ppos)];
327
328 if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM)[ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1])
329 return NULL;
330 return (void *) desc;
331 }
332
333 static void TP_ID(__lttng_seq_stop__, TRACE_SYSTEM)(struct seq_file *m,
334 void *p)
335 {
336 }
337
338 static int TP_ID(__lttng_seq_show__, TRACE_SYSTEM)(struct seq_file *m,
339 void *p)
340 {
341 const struct lttng_event_desc *desc = p;
342 int i;
343
344 seq_printf(m, "event {\n"
345 "\tname = %s;\n"
346 "\tid = UNKNOWN;\n"
347 "\tstream = UNKNOWN;\n"
348 "\tfields = {\n",
349 desc->name);
350 for (i = 0; i < desc->nr_fields; i++) {
351 if (desc->fields[i].type.name) /* Named type */
352 seq_printf(m, "\t\t%s",
353 desc->fields[i].type.name);
354 else /* Nameless type */
355 lttng_print_event_type(m, 2, &desc->fields[i].type);
356 seq_printf(m, " %s;\n", desc->fields[i].name);
357 }
358 seq_printf(m, "\t};\n");
359 seq_printf(m, "};\n");
360 return 0;
361 }
362
363 static const
364 struct seq_operations TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM) = {
365 .start = TP_ID(__lttng_seq_start__, TRACE_SYSTEM),
366 .next = TP_ID(__lttng_seq_next__, TRACE_SYSTEM),
367 .stop = TP_ID(__lttng_seq_stop__, TRACE_SYSTEM),
368 .show = TP_ID(__lttng_seq_show__, TRACE_SYSTEM),
369 };
370
371 static int
372 TP_ID(__lttng_types_open__, TRACE_SYSTEM)(struct inode *inode, struct file *file)
373 {
374 return seq_open(file, &TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM));
375 }
376
377 static const struct file_operations TP_ID(__lttng_types_fops__, TRACE_SYSTEM) = {
378 .open = TP_ID(__lttng_types_open__, TRACE_SYSTEM),
379 .read = seq_read,
380 .llseek = seq_lseek,
381 .release = seq_release_private,
382 };
383
384 static struct dentry *TP_ID(__lttng_types_dentry__, TRACE_SYSTEM);
385
386 static int TP_ID(__lttng_types_init__, TRACE_SYSTEM)(void)
387 {
388 int ret = 0;
389
390 TP_ID(__lttng_types_dentry__, TRACE_SYSTEM) =
391 debugfs_create_file("lttng-events-" __stringify(TRACE_SYSTEM), S_IWUSR,
392 NULL, NULL, &TP_ID(__lttng_types_fops__, TRACE_SYSTEM));
393 if (IS_ERR(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM))
394 || !TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) {
395 printk(KERN_ERR "Error creating LTTng type export file\n");
396 ret = -ENOMEM;
397 goto error;
398 }
399 error:
400 return ret;
401 }
402
403 module_init_eval(__lttng_types_init__, TRACE_SYSTEM);
404
405 static void TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(void)
406 {
407 debugfs_remove(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM));
408 }
409
410 module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM);
411
412 #undef module_init_eval
413 #undef module_exit_eval
414 #undef TP_ID1
415 #undef TP_ID
416
417
418 #if 0
419
420 /*
421 * Stage 3 of the trace events.
422 *
423 * Create static inline function that calculates event size.
424 */
425
426
427
428 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
429
430 /*
431 * Stage 4 of the trace events.
432 *
433 * Create the probe function : call even size calculation and write event data
434 * into the buffer.
435 */
436
437
438
439 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
440
441
442
443
444 #include <linux/ftrace_event.h>
445
446 /*
447 * DECLARE_EVENT_CLASS can be used to add a generic function
448 * handlers for events. That is, if all events have the same
449 * parameters and just have distinct trace points.
450 * Each tracepoint can be defined with DEFINE_EVENT and that
451 * will map the DECLARE_EVENT_CLASS to the tracepoint.
452 *
453 * TRACE_EVENT is a one to one mapping between tracepoint and template.
454 */
455 #undef TRACE_EVENT
456 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
457 DECLARE_EVENT_CLASS(name, \
458 PARAMS(proto), \
459 PARAMS(args), \
460 PARAMS(tstruct), \
461 PARAMS(assign), \
462 PARAMS(print)); \
463 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
464
465
466 #undef __field
467 #define __field(type, item) type item;
468
469 #undef __field_ext
470 #define __field_ext(type, item, filter_type) type item;
471
472 #undef __array
473 #define __array(type, item, len) type item[len];
474
475 #undef __dynamic_array
476 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
477
478 #undef __string
479 #define __string(item, src) __dynamic_array(char, item, -1)
480
481 #undef TP_STRUCT__entry
482 #define TP_STRUCT__entry(args...) args
483
484 #undef DECLARE_EVENT_CLASS
485 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
486 struct ftrace_raw_##name { \
487 struct trace_entry ent; \
488 tstruct \
489 char __data[0]; \
490 }; \
491 \
492 static struct ftrace_event_class event_class_##name;
493
494 #undef DEFINE_EVENT
495 #define DEFINE_EVENT(template, name, proto, args) \
496 static struct ftrace_event_call __used \
497 __attribute__((__aligned__(4))) event_##name
498
499 #undef DEFINE_EVENT_PRINT
500 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
501 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
502
503 /* Callbacks are meaningless to ftrace. */
504 #undef TRACE_EVENT_FN
505 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
506 assign, print, reg, unreg) \
507 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
508 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
509
510 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
511
512
513 /*
514 * Stage 2 of the trace events.
515 *
516 * Create static inline function that calculates event size.
517 */
518
519 #undef __field
520 #define __field(type, item)
521
522 #undef __field_ext
523 #define __field_ext(type, item, filter_type)
524
525 #undef __array
526 #define __array(type, item, len)
527
528 #undef __dynamic_array
529 #define __dynamic_array(type, item, len) u32 item;
530
531 #undef __string
532 #define __string(item, src) __dynamic_array(char, item, -1)
533
534 #undef DECLARE_EVENT_CLASS
535 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
536 struct ftrace_data_offsets_##call { \
537 tstruct; \
538 };
539
540 #undef DEFINE_EVENT
541 #define DEFINE_EVENT(template, name, proto, args)
542
543 #undef DEFINE_EVENT_PRINT
544 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
545 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
546
547 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
548
549 /*
550 * Stage 3 of the trace events.
551 *
552 * Create the probe function : call even size calculation and write event data
553 * into the buffer.
554 */
555
556 #undef __entry
557 #define __entry field
558
559 #undef TP_printk
560 #define TP_printk(fmt, args...) fmt "\n", args
561
562 #undef __get_dynamic_array
563 #define __get_dynamic_array(field) \
564 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
565
566 #undef __get_str
567 #define __get_str(field) (char *)__get_dynamic_array(field)
568
569 #undef __print_flags
570 #define __print_flags(flag, delim, flag_array...) \
571 ({ \
572 static const struct trace_print_flags __flags[] = \
573 { flag_array, { -1, NULL }}; \
574 ftrace_print_flags_seq(p, delim, flag, __flags); \
575 })
576
577 #undef __print_symbolic
578 #define __print_symbolic(value, symbol_array...) \
579 ({ \
580 static const struct trace_print_flags symbols[] = \
581 { symbol_array, { -1, NULL }}; \
582 ftrace_print_symbols_seq(p, value, symbols); \
583 })
584
585 #undef __print_hex
586 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
587
588 #undef DECLARE_EVENT_CLASS
589 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
590 static notrace enum print_line_t \
591 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
592 struct trace_event *trace_event) \
593 { \
594 struct ftrace_event_call *event; \
595 struct trace_seq *s = &iter->seq; \
596 struct ftrace_raw_##call *field; \
597 struct trace_entry *entry; \
598 struct trace_seq *p = &iter->tmp_seq; \
599 int ret; \
600 \
601 event = container_of(trace_event, struct ftrace_event_call, \
602 event); \
603 \
604 entry = iter->ent; \
605 \
606 if (entry->type != event->event.type) { \
607 WARN_ON_ONCE(1); \
608 return TRACE_TYPE_UNHANDLED; \
609 } \
610 \
611 field = (typeof(field))entry; \
612 \
613 trace_seq_init(p); \
614 ret = trace_seq_printf(s, "%s: ", event->name); \
615 if (ret) \
616 ret = trace_seq_printf(s, print); \
617 if (!ret) \
618 return TRACE_TYPE_PARTIAL_LINE; \
619 \
620 return TRACE_TYPE_HANDLED; \
621 } \
622 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
623 .trace = ftrace_raw_output_##call, \
624 };
625
626 #undef DEFINE_EVENT_PRINT
627 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
628 static notrace enum print_line_t \
629 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
630 struct trace_event *event) \
631 { \
632 struct trace_seq *s = &iter->seq; \
633 struct ftrace_raw_##template *field; \
634 struct trace_entry *entry; \
635 struct trace_seq *p = &iter->tmp_seq; \
636 int ret; \
637 \
638 entry = iter->ent; \
639 \
640 if (entry->type != event_##call.event.type) { \
641 WARN_ON_ONCE(1); \
642 return TRACE_TYPE_UNHANDLED; \
643 } \
644 \
645 field = (typeof(field))entry; \
646 \
647 trace_seq_init(p); \
648 ret = trace_seq_printf(s, "%s: ", #call); \
649 if (ret) \
650 ret = trace_seq_printf(s, print); \
651 if (!ret) \
652 return TRACE_TYPE_PARTIAL_LINE; \
653 \
654 return TRACE_TYPE_HANDLED; \
655 } \
656 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
657 .trace = ftrace_raw_output_##call, \
658 };
659
660 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
661
662 #undef __field_ext
663 #define __field_ext(type, item, filter_type) \
664 ret = trace_define_field(event_call, #type, #item, \
665 offsetof(typeof(field), item), \
666 sizeof(field.item), \
667 is_signed_type(type), filter_type); \
668 if (ret) \
669 return ret;
670
671 #undef __field
672 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
673
674 #undef __array
675 #define __array(type, item, len) \
676 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
677 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
678 offsetof(typeof(field), item), \
679 sizeof(field.item), \
680 is_signed_type(type), FILTER_OTHER); \
681 if (ret) \
682 return ret;
683
684 #undef __dynamic_array
685 #define __dynamic_array(type, item, len) \
686 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
687 offsetof(typeof(field), __data_loc_##item), \
688 sizeof(field.__data_loc_##item), \
689 is_signed_type(type), FILTER_OTHER);
690
691 #undef __string
692 #define __string(item, src) __dynamic_array(char, item, -1)
693
694 #undef DECLARE_EVENT_CLASS
695 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
696 static int notrace \
697 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
698 { \
699 struct ftrace_raw_##call field; \
700 int ret; \
701 \
702 tstruct; \
703 \
704 return ret; \
705 }
706
707 #undef DEFINE_EVENT
708 #define DEFINE_EVENT(template, name, proto, args)
709
710 #undef DEFINE_EVENT_PRINT
711 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
712 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
713
714 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
715
716 /*
717 * remember the offset of each array from the beginning of the event.
718 */
719
720 #undef __entry
721 #define __entry entry
722
723 #undef __field
724 #define __field(type, item)
725
726 #undef __field_ext
727 #define __field_ext(type, item, filter_type)
728
729 #undef __array
730 #define __array(type, item, len)
731
732 #undef __dynamic_array
733 #define __dynamic_array(type, item, len) \
734 __data_offsets->item = __data_size + \
735 offsetof(typeof(*entry), __data); \
736 __data_offsets->item |= (len * sizeof(type)) << 16; \
737 __data_size += (len) * sizeof(type);
738
739 #undef __string
740 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
741
742 #undef DECLARE_EVENT_CLASS
743 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
744 static inline notrace int ftrace_get_offsets_##call( \
745 struct ftrace_data_offsets_##call *__data_offsets, proto) \
746 { \
747 int __data_size = 0; \
748 struct ftrace_raw_##call __maybe_unused *entry; \
749 \
750 tstruct; \
751 \
752 return __data_size; \
753 }
754
755 #undef DEFINE_EVENT
756 #define DEFINE_EVENT(template, name, proto, args)
757
758 #undef DEFINE_EVENT_PRINT
759 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
760 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
761
762 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
763
764 /*
765 * Stage 4 of the trace events.
766 *
767 * Override the macros in <trace/trace_events.h> to include the following:
768 *
769 * For those macros defined with TRACE_EVENT:
770 *
771 * static struct ftrace_event_call event_<call>;
772 *
773 * static void ftrace_raw_event_<call>(void *__data, proto)
774 * {
775 * struct ftrace_event_call *event_call = __data;
776 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
777 * struct ring_buffer_event *event;
778 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
779 * struct ring_buffer *buffer;
780 * unsigned long irq_flags;
781 * int __data_size;
782 * int pc;
783 *
784 * local_save_flags(irq_flags);
785 * pc = preempt_count();
786 *
787 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
788 *
789 * event = trace_current_buffer_lock_reserve(&buffer,
790 * event_<call>->event.type,
791 * sizeof(*entry) + __data_size,
792 * irq_flags, pc);
793 * if (!event)
794 * return;
795 * entry = ring_buffer_event_data(event);
796 *
797 * { <assign>; } <-- Here we assign the entries by the __field and
798 * __array macros.
799 *
800 * if (!filter_current_check_discard(buffer, event_call, entry, event))
801 * trace_current_buffer_unlock_commit(buffer,
802 * event, irq_flags, pc);
803 * }
804 *
805 * static struct trace_event ftrace_event_type_<call> = {
806 * .trace = ftrace_raw_output_<call>, <-- stage 2
807 * };
808 *
809 * static const char print_fmt_<call>[] = <TP_printk>;
810 *
811 * static struct ftrace_event_class __used event_class_<template> = {
812 * .system = "<system>",
813 * .define_fields = ftrace_define_fields_<call>,
814 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
815 * .raw_init = trace_event_raw_init,
816 * .probe = ftrace_raw_event_##call,
817 * .reg = ftrace_event_reg,
818 * };
819 *
820 * static struct ftrace_event_call __used
821 * __attribute__((__aligned__(4)))
822 * __attribute__((section("_ftrace_events"))) event_<call> = {
823 * .name = "<call>",
824 * .class = event_class_<template>,
825 * .event = &ftrace_event_type_<call>,
826 * .print_fmt = print_fmt_<call>,
827 * };
828 *
829 */
830
831 #ifdef CONFIG_PERF_EVENTS
832
833 #define _TRACE_PERF_PROTO(call, proto) \
834 static notrace void \
835 perf_trace_##call(void *__data, proto);
836
837 #define _TRACE_PERF_INIT(call) \
838 .perf_probe = perf_trace_##call,
839
840 #else
841 #define _TRACE_PERF_PROTO(call, proto)
842 #define _TRACE_PERF_INIT(call)
843 #endif /* CONFIG_PERF_EVENTS */
844
845 #undef __entry
846 #define __entry entry
847
848 #undef __field
849 #define __field(type, item)
850
851 #undef __array
852 #define __array(type, item, len)
853
854 #undef __dynamic_array
855 #define __dynamic_array(type, item, len) \
856 __entry->__data_loc_##item = __data_offsets.item;
857
858 #undef __string
859 #define __string(item, src) __dynamic_array(char, item, -1) \
860
861 #undef __assign_str
862 #define __assign_str(dst, src) \
863 strcpy(__get_str(dst), src);
864
865 #undef TP_fast_assign
866 #define TP_fast_assign(args...) args
867
868 #undef TP_perf_assign
869 #define TP_perf_assign(args...)
870
871 #undef DECLARE_EVENT_CLASS
872 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
873 \
874 static notrace void \
875 ftrace_raw_event_##call(void *__data, proto) \
876 { \
877 struct ftrace_event_call *event_call = __data; \
878 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
879 struct ring_buffer_event *event; \
880 struct ftrace_raw_##call *entry; \
881 struct ring_buffer *buffer; \
882 unsigned long irq_flags; \
883 int __data_size; \
884 int pc; \
885 \
886 local_save_flags(irq_flags); \
887 pc = preempt_count(); \
888 \
889 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
890 \
891 event = trace_current_buffer_lock_reserve(&buffer, \
892 event_call->event.type, \
893 sizeof(*entry) + __data_size, \
894 irq_flags, pc); \
895 if (!event) \
896 return; \
897 entry = ring_buffer_event_data(event); \
898 \
899 tstruct \
900 \
901 { assign; } \
902 \
903 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
904 trace_nowake_buffer_unlock_commit(buffer, \
905 event, irq_flags, pc); \
906 }
907 /*
908 * The ftrace_test_probe is compiled out, it is only here as a build time check
909 * to make sure that if the tracepoint handling changes, the ftrace probe will
910 * fail to compile unless it too is updated.
911 */
912
913 #undef DEFINE_EVENT
914 #define DEFINE_EVENT(template, call, proto, args) \
915 static inline void ftrace_test_probe_##call(void) \
916 { \
917 check_trace_callback_type_##call(ftrace_raw_event_##template); \
918 }
919
920 #undef DEFINE_EVENT_PRINT
921 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
922
923 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
924
925 #undef __entry
926 #define __entry REC
927
928 #undef __print_flags
929 #undef __print_symbolic
930 #undef __get_dynamic_array
931 #undef __get_str
932
933 #undef TP_printk
934 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
935
936 #undef DECLARE_EVENT_CLASS
937 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
938 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
939 static const char print_fmt_##call[] = print; \
940 static struct ftrace_event_class __used event_class_##call = { \
941 .system = __stringify(TRACE_SYSTEM), \
942 .define_fields = ftrace_define_fields_##call, \
943 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
944 .raw_init = trace_event_raw_init, \
945 .probe = ftrace_raw_event_##call, \
946 .reg = ftrace_event_reg, \
947 _TRACE_PERF_INIT(call) \
948 };
949
950 #undef DEFINE_EVENT
951 #define DEFINE_EVENT(template, call, proto, args) \
952 \
953 static struct ftrace_event_call __used \
954 __attribute__((__aligned__(4))) \
955 __attribute__((section("_ftrace_events"))) event_##call = { \
956 .name = #call, \
957 .class = &event_class_##template, \
958 .event.funcs = &ftrace_event_type_funcs_##template, \
959 .print_fmt = print_fmt_##template, \
960 };
961
962 #undef DEFINE_EVENT_PRINT
963 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
964 \
965 static const char print_fmt_##call[] = print; \
966 \
967 static struct ftrace_event_call __used \
968 __attribute__((__aligned__(4))) \
969 __attribute__((section("_ftrace_events"))) event_##call = { \
970 .name = #call, \
971 .class = &event_class_##template, \
972 .event.funcs = &ftrace_event_type_funcs_##call, \
973 .print_fmt = print_fmt_##call, \
974 }
975
976 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
977
978 /*
979 * Define the insertion callback to perf events
980 *
981 * The job is very similar to ftrace_raw_event_<call> except that we don't
982 * insert in the ring buffer but in a perf counter.
983 *
984 * static void ftrace_perf_<call>(proto)
985 * {
986 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
987 * struct ftrace_event_call *event_call = &event_<call>;
988 * extern void perf_tp_event(int, u64, u64, void *, int);
989 * struct ftrace_raw_##call *entry;
990 * struct perf_trace_buf *trace_buf;
991 * u64 __addr = 0, __count = 1;
992 * unsigned long irq_flags;
993 * struct trace_entry *ent;
994 * int __entry_size;
995 * int __data_size;
996 * int __cpu
997 * int pc;
998 *
999 * pc = preempt_count();
1000 *
1001 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
1002 *
1003 * // Below we want to get the aligned size by taking into account
1004 * // the u32 field that will later store the buffer size
1005 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
1006 * sizeof(u64));
1007 * __entry_size -= sizeof(u32);
1008 *
1009 * // Protect the non nmi buffer
1010 * // This also protects the rcu read side
1011 * local_irq_save(irq_flags);
1012 * __cpu = smp_processor_id();
1013 *
1014 * if (in_nmi())
1015 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
1016 * else
1017 * trace_buf = rcu_dereference_sched(perf_trace_buf);
1018 *
1019 * if (!trace_buf)
1020 * goto end;
1021 *
1022 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
1023 *
1024 * // Avoid recursion from perf that could mess up the buffer
1025 * if (trace_buf->recursion++)
1026 * goto end_recursion;
1027 *
1028 * raw_data = trace_buf->buf;
1029 *
1030 * // Make recursion update visible before entering perf_tp_event
1031 * // so that we protect from perf recursions.
1032 *
1033 * barrier();
1034 *
1035 * //zero dead bytes from alignment to avoid stack leak to userspace:
1036 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
1037 * entry = (struct ftrace_raw_<call> *)raw_data;
1038 * ent = &entry->ent;
1039 * tracing_generic_entry_update(ent, irq_flags, pc);
1040 * ent->type = event_call->id;
1041 *
1042 * <tstruct> <- do some jobs with dynamic arrays
1043 *
1044 * <assign> <- affect our values
1045 *
1046 * perf_tp_event(event_call->id, __addr, __count, entry,
1047 * __entry_size); <- submit them to perf counter
1048 *
1049 * }
1050 */
1051
1052 #ifdef CONFIG_PERF_EVENTS
1053
1054 #undef __entry
1055 #define __entry entry
1056
1057 #undef __get_dynamic_array
1058 #define __get_dynamic_array(field) \
1059 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
1060
1061 #undef __get_str
1062 #define __get_str(field) (char *)__get_dynamic_array(field)
1063
1064 #undef __perf_addr
1065 #define __perf_addr(a) __addr = (a)
1066
1067 #undef __perf_count
1068 #define __perf_count(c) __count = (c)
1069
1070 #undef DECLARE_EVENT_CLASS
1071 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
1072 static notrace void \
1073 perf_trace_##call(void *__data, proto) \
1074 { \
1075 struct ftrace_event_call *event_call = __data; \
1076 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
1077 struct ftrace_raw_##call *entry; \
1078 struct pt_regs __regs; \
1079 u64 __addr = 0, __count = 1; \
1080 struct hlist_head *head; \
1081 int __entry_size; \
1082 int __data_size; \
1083 int rctx; \
1084 \
1085 perf_fetch_caller_regs(&__regs); \
1086 \
1087 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
1088 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
1089 sizeof(u64)); \
1090 __entry_size -= sizeof(u32); \
1091 \
1092 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
1093 "profile buffer not large enough")) \
1094 return; \
1095 \
1096 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
1097 __entry_size, event_call->event.type, &__regs, &rctx); \
1098 if (!entry) \
1099 return; \
1100 \
1101 tstruct \
1102 \
1103 { assign; } \
1104 \
1105 head = this_cpu_ptr(event_call->perf_events); \
1106 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
1107 __count, &__regs, head); \
1108 }
1109
1110 /*
1111 * This part is compiled out, it is only here as a build time check
1112 * to make sure that if the tracepoint handling changes, the
1113 * perf probe will fail to compile unless it too is updated.
1114 */
1115 #undef DEFINE_EVENT
1116 #define DEFINE_EVENT(template, call, proto, args) \
1117 static inline void perf_test_probe_##call(void) \
1118 { \
1119 check_trace_callback_type_##call(perf_trace_##template); \
1120 }
1121
1122
1123 #undef DEFINE_EVENT_PRINT
1124 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
1125 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
1126
1127 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1128 #endif /* CONFIG_PERF_EVENTS */
1129
1130 #undef _TRACE_PROFILE_INIT
1131 #endif //0
LTTng modules - Deliverables
This page took 0.053059 seconds and 4 git commands to generate.