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Add serialization function
[lttng-modules.git] / probes / lttng-events.h
1 #include <lttng.h>
2 #include <lttng-types.h>
3 #include <linux/debugfs.h>
4 #include <linux/ringbuffer/frontend_types.h>
5 #include "../ltt-events.h"
6 #include "../ltt-tracer-core.h"
7
8 struct lttng_event_field {
9 const char *name;
10 const struct lttng_type type;
11 };
12
13 struct lttng_event_desc {
14 const struct lttng_event_field *fields;
15 const char *name;
16 unsigned int nr_fields;
17 };
18
19 /*
20 * Macro declarations used for all stages.
21 */
22
23 /*
24 * DECLARE_EVENT_CLASS can be used to add a generic function
25 * handlers for events. That is, if all events have the same
26 * parameters and just have distinct trace points.
27 * Each tracepoint can be defined with DEFINE_EVENT and that
28 * will map the DECLARE_EVENT_CLASS to the tracepoint.
29 *
30 * TRACE_EVENT is a one to one mapping between tracepoint and template.
31 */
32
33 #undef TRACE_EVENT
34 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
35 DECLARE_EVENT_CLASS(name, \
36 PARAMS(proto), \
37 PARAMS(args), \
38 PARAMS(tstruct), \
39 PARAMS(assign), \
40 PARAMS(print)) \
41 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args))
42
43 #undef DEFINE_EVENT_PRINT
44 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
45 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
46
47 /* Callbacks are meaningless to LTTng. */
48 #undef TRACE_EVENT_FN
49 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
50 assign, print, reg, unreg) \
51 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
52 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
53
54 /*
55 * Stage 1 of the trace events.
56 *
57 * Create event field type metadata section.
58 * Each event produce an array of fields.
59 */
60
61 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
62
63 /* Named field types must be defined in lttng-types.h */
64
65 #undef __field
66 #define __field(_type, _item) \
67 { .name = #_item, .type = { .atype = atype_integer, .name = #_type} },
68
69 #undef __field_ext
70 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
71
72 #undef __array
73 #define __array(_type, _item, _length) \
74 { \
75 .name = #_item, \
76 .type = { \
77 .atype = atype_array, \
78 .name = NULL, \
79 .u.array.elem_type = #_type, \
80 .u.array.length = _length, \
81 }, \
82 },
83
84 #undef __dynamic_array
85 #define __dynamic_array(_type, _item, _length) \
86 { \
87 .name = #_item, \
88 .type = { \
89 .atype = atype_sequence, \
90 .name = NULL, \
91 .u.sequence.elem_type = #_type, \
92 .u.sequence.length_type = "u32", \
93 }, \
94 },
95
96 #undef __string
97 #define __string(_item, _src) \
98 { \
99 .name = #_item, \
100 .type = { \
101 .atype = atype_string, \
102 .name = NULL, \
103 .u.string.encoding = lttng_encode_UTF8, \
104 }, \
105 },
106
107 #undef TP_STRUCT__entry
108 #define TP_STRUCT__entry(args...) args /* Only one used in this phase */
109
110 #undef DECLARE_EVENT_CLASS
111 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
112 static const struct lttng_event_field __event_fields___##_name[] = { \
113 _tstruct \
114 };
115
116 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
117
118 /*
119 * Stage 2 of the trace events.
120 *
121 * Create an array of events.
122 */
123
124 /* Named field types must be defined in lttng-types.h */
125
126 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
127
128 #undef DEFINE_EVENT
129 #define DEFINE_EVENT(_template, _name, _proto, _args) \
130 { \
131 .fields = __event_fields___##_template, \
132 .name = #_name, \
133 .nr_fields = ARRAY_SIZE(__event_fields___##_template), \
134 },
135
136 #define TP_ID1(_token, _system) _token##_system
137 #define TP_ID(_token, _system) TP_ID1(_token, _system)
138
139 static const struct lttng_event_desc TP_ID(__event_desc___, TRACE_SYSTEM)[] = {
140 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
141 };
142
143 #undef TP_ID1
144 #undef TP_ID
145
146 /*
147 * Stage 3 of the trace events.
148 *
149 * Create seq file metadata output.
150 */
151
152 #define TP_ID1(_token, _system) _token##_system
153 #define TP_ID(_token, _system) TP_ID1(_token, _system)
154 #define module_init_eval1(_token, _system) module_init(_token##_system)
155 #define module_init_eval(_token, _system) module_init_eval1(_token, _system)
156 #define module_exit_eval1(_token, _system) module_exit(_token##_system)
157 #define module_exit_eval(_token, _system) module_exit_eval1(_token, _system)
158
159 static void *TP_ID(__lttng_seq_start__, TRACE_SYSTEM)(struct seq_file *m,
160 loff_t *pos)
161 {
162 const struct lttng_event_desc *desc =
163 &TP_ID(__event_desc___, TRACE_SYSTEM)[*pos];
164
165 if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM)
166 [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1])
167 return NULL;
168 return (void *) desc;
169 }
170
171 static void *TP_ID(__lttng_seq_next__, TRACE_SYSTEM)(struct seq_file *m,
172 void *p, loff_t *ppos)
173 {
174 const struct lttng_event_desc *desc =
175 &TP_ID(__event_desc___, TRACE_SYSTEM)[++(*ppos)];
176
177 if (desc > &TP_ID(__event_desc___, TRACE_SYSTEM)
178 [ARRAY_SIZE(TP_ID(__event_desc___, TRACE_SYSTEM)) - 1])
179 return NULL;
180 return (void *) desc;
181 }
182
183 static void TP_ID(__lttng_seq_stop__, TRACE_SYSTEM)(struct seq_file *m,
184 void *p)
185 {
186 }
187
188 static int TP_ID(__lttng_seq_show__, TRACE_SYSTEM)(struct seq_file *m,
189 void *p)
190 {
191 const struct lttng_event_desc *desc = p;
192 int i;
193
194 seq_printf(m, "event {\n"
195 "\tname = %s;\n"
196 "\tid = UNKNOWN;\n"
197 "\tstream = UNKNOWN;\n"
198 "\tfields = {\n",
199 desc->name);
200 for (i = 0; i < desc->nr_fields; i++) {
201 if (desc->fields[i].type.name) /* Named type */
202 seq_printf(m, "\t\t%s",
203 desc->fields[i].type.name);
204 else /* Nameless type */
205 lttng_print_event_type(m, 2, &desc->fields[i].type);
206 seq_printf(m, " %s;\n", desc->fields[i].name);
207 }
208 seq_printf(m, "\t};\n");
209 seq_printf(m, "};\n");
210 return 0;
211 }
212
213 static const
214 struct seq_operations TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM) = {
215 .start = TP_ID(__lttng_seq_start__, TRACE_SYSTEM),
216 .next = TP_ID(__lttng_seq_next__, TRACE_SYSTEM),
217 .stop = TP_ID(__lttng_seq_stop__, TRACE_SYSTEM),
218 .show = TP_ID(__lttng_seq_show__, TRACE_SYSTEM),
219 };
220
221 static int
222 TP_ID(__lttng_types_open__, TRACE_SYSTEM)(struct inode *inode, struct file *file)
223 {
224 return seq_open(file, &TP_ID(__lttng_types_seq_ops__, TRACE_SYSTEM));
225 }
226
227 static const
228 struct file_operations TP_ID(__lttng_types_fops__, TRACE_SYSTEM) = {
229 .open = TP_ID(__lttng_types_open__, TRACE_SYSTEM),
230 .read = seq_read,
231 .llseek = seq_lseek,
232 .release = seq_release_private,
233 };
234
235 static struct dentry *TP_ID(__lttng_types_dentry__, TRACE_SYSTEM);
236
237 static int TP_ID(__lttng_types_init__, TRACE_SYSTEM)(void)
238 {
239 int ret = 0;
240
241 TP_ID(__lttng_types_dentry__, TRACE_SYSTEM) =
242 debugfs_create_file("lttng-events-" __stringify(TRACE_SYSTEM),
243 S_IWUSR, NULL, NULL,
244 &TP_ID(__lttng_types_fops__, TRACE_SYSTEM));
245 if (IS_ERR(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM))
246 || !TP_ID(__lttng_types_dentry__, TRACE_SYSTEM)) {
247 printk(KERN_ERR "Error creating LTTng type export file\n");
248 ret = -ENOMEM;
249 goto error;
250 }
251 error:
252 return ret;
253 }
254
255 module_init_eval(__lttng_types_init__, TRACE_SYSTEM);
256
257 static void TP_ID(__lttng_types_exit__, TRACE_SYSTEM)(void)
258 {
259 debugfs_remove(TP_ID(__lttng_types_dentry__, TRACE_SYSTEM));
260 }
261
262 module_exit_eval(__lttng_types_exit__, TRACE_SYSTEM);
263
264 #undef module_init_eval
265 #undef module_exit_eval
266 #undef TP_ID1
267 #undef TP_ID
268
269 /*
270 * Stage 4 of the trace events.
271 *
272 * Create static inline function that calculates event size.
273 */
274
275 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
276
277 /* Named field types must be defined in lttng-types.h */
278
279 #undef __field
280 #define __field(_type, _item) \
281 __event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
282 __event_len += sizeof(_type);
283
284 #undef __field_ext
285 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
286
287 #undef __array
288 #define __array(_type, _item, _length) \
289 __event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
290 __event_len += sizeof(_type) * (_length);
291
292 #undef __dynamic_array
293 #define __dynamic_array(_type, _item, _length) \
294 __event_len += lib_ring_buffer_align(__event_len, sizeof(u32)); \
295 __event_len += sizeof(u32); \
296 __event_len += lib_ring_buffer_align(__event_len, sizeof(_type)); \
297 __event_len += sizeof(_type) * (_length);
298
299 #undef __string
300 #define __string(_item, _src) \
301 __event_len += __dynamic_len[__dynamic_len_idx++] = strlen(_src) + 1;
302
303 #undef TP_PROTO
304 #define TP_PROTO(args...) args
305
306 #undef TP_STRUCT__entry
307 #define TP_STRUCT__entry(args...) args
308
309 #undef DECLARE_EVENT_CLASS
310 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
311 static inline size_t __event_get_size__##_name(size_t *__dynamic_len, _proto) \
312 { \
313 size_t __event_len = 0; \
314 unsigned int __dynamic_len_idx = 0; \
315 \
316 if (0) \
317 (void) __dynamic_len_idx; /* don't warn if unused */ \
318 _tstruct \
319 return __event_len; \
320 }
321
322 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
323
324
325
326 /*
327 * Stage 5 of the trace events.
328 *
329 * Create static inline function that calculates event payload alignment.
330 */
331
332 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
333
334 /* Named field types must be defined in lttng-types.h */
335
336 #undef __field
337 #define __field(_type, _item) \
338 __event_align = max_t(size_t, __event_align, sizeof(_type));
339
340 #undef __field_ext
341 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
342
343 #undef __array
344 #define __array(_type, _item, _length) \
345 __event_align = max_t(size_t, __event_align, sizeof(_type));
346
347 #undef __dynamic_array
348 #define __dynamic_array(_type, _item, _length) \
349 __event_align = max_t(size_t, __event_align, sizeof(u32)); \
350 __event_align = max_t(size_t, __event_align, sizeof(_type));
351
352 #undef __string
353 #define __string(_item, _src)
354
355 #undef TP_PROTO
356 #define TP_PROTO(args...) args
357
358 #undef TP_STRUCT__entry
359 #define TP_STRUCT__entry(args...) args
360
361 #undef DECLARE_EVENT_CLASS
362 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
363 static inline size_t __event_get_align__##_name(_proto) \
364 { \
365 size_t __event_align = 1; \
366 _tstruct \
367 return __event_align; \
368 }
369
370 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
371
372
373
374 /*
375 * Stage 6 of the trace events.
376 *
377 * Create the probe function : call even size calculation and write event data
378 * into the buffer.
379 *
380 * Note: the order of fields in TP_fast_assign and TP_STRUCT__entry must be the
381 * same.
382 */
383
384 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
385
386 #undef __field
387 #define __field(_type, _item) \
388 lib_ring_buffer_align_ctx(&ctx, sizeof(_type)); \
389 goto __assign_##_item; \
390 __end_field_##_item:
391
392 #undef __field_ext
393 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
394
395 #undef __array
396 #define __array(_type, _item, _length) \
397 lib_ring_buffer_align_ctx(&ctx, sizeof(_type)); \
398 goto __assign_##_item; \
399 __end_field_##_item:
400
401 #undef __dynamic_array
402 #define __dynamic_array(_type, _item, _length) \
403 lib_ring_buffer_align_ctx(&ctx, sizeof(u32)); \
404 goto __assign_##_item##_1; \
405 __end_field_##_item##_1: \
406 lib_ring_buffer_align_ctx(&ctx, sizeof(_type)); \
407 goto __assign_##_item##_2; \
408 __end_field_##_item##_2:
409
410 #undef __string
411 #define __string(_item, _src) \
412 goto __assign_##_item; \
413 __end_field_##_item:
414
415 /*
416 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
417 * strcpy().
418 */
419 #undef tp_assign
420 #define tp_assign(dest, src) \
421 __assign_##dest: \
422 { \
423 __typeof__(src) __tmp = (src); \
424 __chan->ops->event_write(&ctx, &__tmp, sizeof(src)); \
425 } \
426 goto __end_field_##dest;
427
428 #undef tp_memcpy
429 #define tp_memcpy(dest, src, len) \
430 __assign_##dest: \
431 __chan->ops->event_write(&ctx, src, len); \
432 goto __end_field_##dest;
433
434 #undef tp_memcpy_dyn
435 #define tp_memcpy_dyn(dest, src, len) \
436 __assign_##dest##_1: \
437 { \
438 __typeof__(len) __tmpl = (len); \
439 __chan->ops->event_write(&ctx, &__tmpl, sizeof(u32)); \
440 } \
441 goto __end_field_##dest##_1; \
442 __assign_##dest##_2: \
443 __chan->ops->event_write(&ctx, src, len); \
444 goto __end_field_##dest##_2;
445
446 #undef tp_strcpy
447 #define tp_strcpy(dest, src) \
448 tp_memcpy(dest, src, __get_dynamic_array_len(dest)); \
449
450 /* Named field types must be defined in lttng-types.h */
451
452 #undef __get_str
453 #define __get_str(field) field
454
455 #undef __get_dynamic_array
456 #define __get_dynamic_array(field) field
457
458 /* Beware: this get len actually consumes the len value */
459 #undef __get_dynamic_array_len
460 #define __get_dynamic_array_len(field) __dynamic_len[__dynamic_len_idx++]
461
462 #undef TP_PROTO
463 #define TP_PROTO(args...) args
464
465 #undef TP_ARGS
466 #define TP_ARGS(args...) args
467
468 #undef TP_STRUCT__entry
469 #define TP_STRUCT__entry(args...) args
470
471 #undef TP_fast_assign
472 #define TP_fast_assign(args...) args
473
474 #undef DECLARE_EVENT_CLASS
475 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
476 static void __event_probe__##_name(void *__data, _proto) \
477 { \
478 struct ltt_event *__event = __data; \
479 struct ltt_channel *__chan = __event->chan; \
480 struct lib_ring_buffer_ctx ctx; \
481 size_t __event_len, __event_align; \
482 size_t __dynamic_len_idx = 0; \
483 size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \
484 int __ret; \
485 \
486 if (0) \
487 (void) __dynamic_len_idx; /* don't warn if unused */ \
488 __event_len = __event_get_size__##_name(__dynamic_len, _args); \
489 __event_align = __event_get_align__##_name(_args); \
490 lib_ring_buffer_ctx_init(&ctx, __chan->chan, NULL, __event_len, \
491 __event_align, -1); \
492 __ret = __chan->ops->event_reserve(&ctx); \
493 if (__ret < 0) \
494 return; \
495 /* Control code (field ordering) */ \
496 _tstruct \
497 __chan->ops->event_commit(&ctx); \
498 return; \
499 /* Copy code, steered by control code */ \
500 _assign \
501 }
502
503 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
504
505
506 #if 0
507
508 #include <linux/ftrace_event.h>
509
510 /*
511 * DECLARE_EVENT_CLASS can be used to add a generic function
512 * handlers for events. That is, if all events have the same
513 * parameters and just have distinct trace points.
514 * Each tracepoint can be defined with DEFINE_EVENT and that
515 * will map the DECLARE_EVENT_CLASS to the tracepoint.
516 *
517 * TRACE_EVENT is a one to one mapping between tracepoint and template.
518 */
519 #undef TRACE_EVENT
520 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
521 DECLARE_EVENT_CLASS(name, \
522 PARAMS(proto), \
523 PARAMS(args), \
524 PARAMS(tstruct), \
525 PARAMS(assign), \
526 PARAMS(print)); \
527 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
528
529
530 #undef __field
531 #define __field(type, item) type item;
532
533 #undef __field_ext
534 #define __field_ext(type, item, filter_type) type item;
535
536 #undef __array
537 #define __array(type, item, len) type item[len];
538
539 #undef __dynamic_array
540 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
541
542 #undef __string
543 #define __string(item, src) __dynamic_array(char, item, -1)
544
545 #undef TP_STRUCT__entry
546 #define TP_STRUCT__entry(args...) args
547
548 #undef DECLARE_EVENT_CLASS
549 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
550 struct ftrace_raw_##name { \
551 struct trace_entry ent; \
552 tstruct \
553 char __data[0]; \
554 }; \
555 \
556 static struct ftrace_event_class event_class_##name;
557
558 #undef DEFINE_EVENT
559 #define DEFINE_EVENT(template, name, proto, args) \
560 static struct ftrace_event_call __used \
561 __attribute__((__aligned__(4))) event_##name
562
563 #undef DEFINE_EVENT_PRINT
564 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
565 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
566
567 /* Callbacks are meaningless to ftrace. */
568 #undef TRACE_EVENT_FN
569 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
570 assign, print, reg, unreg) \
571 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
572 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
573
574 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
575
576
577 /*
578 * Stage 2 of the trace events.
579 *
580 * Create static inline function that calculates event size.
581 */
582
583 #undef __field
584 #define __field(type, item)
585
586 #undef __field_ext
587 #define __field_ext(type, item, filter_type)
588
589 #undef __array
590 #define __array(type, item, len)
591
592 #undef __dynamic_array
593 #define __dynamic_array(type, item, len) u32 item;
594
595 #undef __string
596 #define __string(item, src) __dynamic_array(char, item, -1)
597
598 #undef DECLARE_EVENT_CLASS
599 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
600 struct ftrace_data_offsets_##call { \
601 tstruct; \
602 };
603
604 #undef DEFINE_EVENT
605 #define DEFINE_EVENT(template, name, proto, args)
606
607 #undef DEFINE_EVENT_PRINT
608 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
609 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
610
611 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
612
613 /*
614 * Stage 3 of the trace events.
615 *
616 * Create the probe function : call even size calculation and write event data
617 * into the buffer.
618 */
619
620 #undef __entry
621 #define __entry field
622
623 #undef TP_printk
624 #define TP_printk(fmt, args...) fmt "\n", args
625
626 #undef __get_dynamic_array
627 #define __get_dynamic_array(field) \
628 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
629
630 #undef __get_str
631 #define __get_str(field) (char *)__get_dynamic_array(field)
632
633 #undef __print_flags
634 #define __print_flags(flag, delim, flag_array...) \
635 ({ \
636 static const struct trace_print_flags __flags[] = \
637 { flag_array, { -1, NULL }}; \
638 ftrace_print_flags_seq(p, delim, flag, __flags); \
639 })
640
641 #undef __print_symbolic
642 #define __print_symbolic(value, symbol_array...) \
643 ({ \
644 static const struct trace_print_flags symbols[] = \
645 { symbol_array, { -1, NULL }}; \
646 ftrace_print_symbols_seq(p, value, symbols); \
647 })
648
649 #undef __print_hex
650 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
651
652 #undef DECLARE_EVENT_CLASS
653 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
654 static notrace enum print_line_t \
655 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
656 struct trace_event *trace_event) \
657 { \
658 struct ftrace_event_call *event; \
659 struct trace_seq *s = &iter->seq; \
660 struct ftrace_raw_##call *field; \
661 struct trace_entry *entry; \
662 struct trace_seq *p = &iter->tmp_seq; \
663 int ret; \
664 \
665 event = container_of(trace_event, struct ftrace_event_call, \
666 event); \
667 \
668 entry = iter->ent; \
669 \
670 if (entry->type != event->event.type) { \
671 WARN_ON_ONCE(1); \
672 return TRACE_TYPE_UNHANDLED; \
673 } \
674 \
675 field = (typeof(field))entry; \
676 \
677 trace_seq_init(p); \
678 ret = trace_seq_printf(s, "%s: ", event->name); \
679 if (ret) \
680 ret = trace_seq_printf(s, print); \
681 if (!ret) \
682 return TRACE_TYPE_PARTIAL_LINE; \
683 \
684 return TRACE_TYPE_HANDLED; \
685 } \
686 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
687 .trace = ftrace_raw_output_##call, \
688 };
689
690 #undef DEFINE_EVENT_PRINT
691 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
692 static notrace enum print_line_t \
693 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
694 struct trace_event *event) \
695 { \
696 struct trace_seq *s = &iter->seq; \
697 struct ftrace_raw_##template *field; \
698 struct trace_entry *entry; \
699 struct trace_seq *p = &iter->tmp_seq; \
700 int ret; \
701 \
702 entry = iter->ent; \
703 \
704 if (entry->type != event_##call.event.type) { \
705 WARN_ON_ONCE(1); \
706 return TRACE_TYPE_UNHANDLED; \
707 } \
708 \
709 field = (typeof(field))entry; \
710 \
711 trace_seq_init(p); \
712 ret = trace_seq_printf(s, "%s: ", #call); \
713 if (ret) \
714 ret = trace_seq_printf(s, print); \
715 if (!ret) \
716 return TRACE_TYPE_PARTIAL_LINE; \
717 \
718 return TRACE_TYPE_HANDLED; \
719 } \
720 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
721 .trace = ftrace_raw_output_##call, \
722 };
723
724 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
725
726 #undef __field_ext
727 #define __field_ext(type, item, filter_type) \
728 ret = trace_define_field(event_call, #type, #item, \
729 offsetof(typeof(field), item), \
730 sizeof(field.item), \
731 is_signed_type(type), filter_type); \
732 if (ret) \
733 return ret;
734
735 #undef __field
736 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
737
738 #undef __array
739 #define __array(type, item, len) \
740 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
741 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
742 offsetof(typeof(field), item), \
743 sizeof(field.item), \
744 is_signed_type(type), FILTER_OTHER); \
745 if (ret) \
746 return ret;
747
748 #undef __dynamic_array
749 #define __dynamic_array(type, item, len) \
750 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
751 offsetof(typeof(field), __data_loc_##item), \
752 sizeof(field.__data_loc_##item), \
753 is_signed_type(type), FILTER_OTHER);
754
755 #undef __string
756 #define __string(item, src) __dynamic_array(char, item, -1)
757
758 #undef DECLARE_EVENT_CLASS
759 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
760 static int notrace \
761 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
762 { \
763 struct ftrace_raw_##call field; \
764 int ret; \
765 \
766 tstruct; \
767 \
768 return ret; \
769 }
770
771 #undef DEFINE_EVENT
772 #define DEFINE_EVENT(template, name, proto, args)
773
774 #undef DEFINE_EVENT_PRINT
775 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
776 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
777
778 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
779
780 /*
781 * remember the offset of each array from the beginning of the event.
782 */
783
784 #undef __entry
785 #define __entry entry
786
787 #undef __field
788 #define __field(type, item)
789
790 #undef __field_ext
791 #define __field_ext(type, item, filter_type)
792
793 #undef __array
794 #define __array(type, item, len)
795
796 #undef __dynamic_array
797 #define __dynamic_array(type, item, len) \
798 __data_offsets->item = __data_size + \
799 offsetof(typeof(*entry), __data); \
800 __data_offsets->item |= (len * sizeof(type)) << 16; \
801 __data_size += (len) * sizeof(type);
802
803 #undef __string
804 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
805
806 #undef DECLARE_EVENT_CLASS
807 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
808 static inline notrace int ftrace_get_offsets_##call( \
809 struct ftrace_data_offsets_##call *__data_offsets, proto) \
810 { \
811 int __data_size = 0; \
812 struct ftrace_raw_##call __maybe_unused *entry; \
813 \
814 tstruct; \
815 \
816 return __data_size; \
817 }
818
819 #undef DEFINE_EVENT
820 #define DEFINE_EVENT(template, name, proto, args)
821
822 #undef DEFINE_EVENT_PRINT
823 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
824 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
825
826 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
827
828 /*
829 * Stage 4 of the trace events.
830 *
831 * Override the macros in <trace/trace_events.h> to include the following:
832 *
833 * For those macros defined with TRACE_EVENT:
834 *
835 * static struct ftrace_event_call event_<call>;
836 *
837 * static void ftrace_raw_event_<call>(void *__data, proto)
838 * {
839 * struct ftrace_event_call *event_call = __data;
840 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
841 * struct ring_buffer_event *event;
842 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
843 * struct ring_buffer *buffer;
844 * unsigned long irq_flags;
845 * int __data_size;
846 * int pc;
847 *
848 * local_save_flags(irq_flags);
849 * pc = preempt_count();
850 *
851 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
852 *
853 * event = trace_current_buffer_lock_reserve(&buffer,
854 * event_<call>->event.type,
855 * sizeof(*entry) + __data_size,
856 * irq_flags, pc);
857 * if (!event)
858 * return;
859 * entry = ring_buffer_event_data(event);
860 *
861 * { <assign>; } <-- Here we assign the entries by the __field and
862 * __array macros.
863 *
864 * if (!filter_current_check_discard(buffer, event_call, entry, event))
865 * trace_current_buffer_unlock_commit(buffer,
866 * event, irq_flags, pc);
867 * }
868 *
869 * static struct trace_event ftrace_event_type_<call> = {
870 * .trace = ftrace_raw_output_<call>, <-- stage 2
871 * };
872 *
873 * static const char print_fmt_<call>[] = <TP_printk>;
874 *
875 * static struct ftrace_event_class __used event_class_<template> = {
876 * .system = "<system>",
877 * .define_fields = ftrace_define_fields_<call>,
878 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
879 * .raw_init = trace_event_raw_init,
880 * .probe = ftrace_raw_event_##call,
881 * .reg = ftrace_event_reg,
882 * };
883 *
884 * static struct ftrace_event_call __used
885 * __attribute__((__aligned__(4)))
886 * __attribute__((section("_ftrace_events"))) event_<call> = {
887 * .name = "<call>",
888 * .class = event_class_<template>,
889 * .event = &ftrace_event_type_<call>,
890 * .print_fmt = print_fmt_<call>,
891 * };
892 *
893 */
894
895 #ifdef CONFIG_PERF_EVENTS
896
897 #define _TRACE_PERF_PROTO(call, proto) \
898 static notrace void \
899 perf_trace_##call(void *__data, proto);
900
901 #define _TRACE_PERF_INIT(call) \
902 .perf_probe = perf_trace_##call,
903
904 #else
905 #define _TRACE_PERF_PROTO(call, proto)
906 #define _TRACE_PERF_INIT(call)
907 #endif /* CONFIG_PERF_EVENTS */
908
909 #undef __entry
910 #define __entry entry
911
912 #undef __field
913 #define __field(type, item)
914
915 #undef __array
916 #define __array(type, item, len)
917
918 #undef __dynamic_array
919 #define __dynamic_array(type, item, len) \
920 __entry->__data_loc_##item = __data_offsets.item;
921
922 #undef __string
923 #define __string(item, src) __dynamic_array(char, item, -1) \
924
925 #undef __assign_str
926 #define __assign_str(dst, src) \
927 strcpy(__get_str(dst), src);
928
929 #undef TP_fast_assign
930 #define TP_fast_assign(args...) args
931
932 #undef TP_perf_assign
933 #define TP_perf_assign(args...)
934
935 #undef DECLARE_EVENT_CLASS
936 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
937 \
938 static notrace void \
939 ftrace_raw_event_##call(void *__data, proto) \
940 { \
941 struct ftrace_event_call *event_call = __data; \
942 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
943 struct ring_buffer_event *event; \
944 struct ftrace_raw_##call *entry; \
945 struct ring_buffer *buffer; \
946 unsigned long irq_flags; \
947 int __data_size; \
948 int pc; \
949 \
950 local_save_flags(irq_flags); \
951 pc = preempt_count(); \
952 \
953 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
954 \
955 event = trace_current_buffer_lock_reserve(&buffer, \
956 event_call->event.type, \
957 sizeof(*entry) + __data_size, \
958 irq_flags, pc); \
959 if (!event) \
960 return; \
961 entry = ring_buffer_event_data(event); \
962 \
963 tstruct \
964 \
965 { assign; } \
966 \
967 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
968 trace_nowake_buffer_unlock_commit(buffer, \
969 event, irq_flags, pc); \
970 }
971 /*
972 * The ftrace_test_probe is compiled out, it is only here as a build time check
973 * to make sure that if the tracepoint handling changes, the ftrace probe will
974 * fail to compile unless it too is updated.
975 */
976
977 #undef DEFINE_EVENT
978 #define DEFINE_EVENT(template, call, proto, args) \
979 static inline void ftrace_test_probe_##call(void) \
980 { \
981 check_trace_callback_type_##call(ftrace_raw_event_##template); \
982 }
983
984 #undef DEFINE_EVENT_PRINT
985 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
986
987 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
988
989 #undef __entry
990 #define __entry REC
991
992 #undef __print_flags
993 #undef __print_symbolic
994 #undef __get_dynamic_array
995 #undef __get_str
996
997 #undef TP_printk
998 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
999
1000 #undef DECLARE_EVENT_CLASS
1001 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
1002 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
1003 static const char print_fmt_##call[] = print; \
1004 static struct ftrace_event_class __used event_class_##call = { \
1005 .system = __stringify(TRACE_SYSTEM), \
1006 .define_fields = ftrace_define_fields_##call, \
1007 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
1008 .raw_init = trace_event_raw_init, \
1009 .probe = ftrace_raw_event_##call, \
1010 .reg = ftrace_event_reg, \
1011 _TRACE_PERF_INIT(call) \
1012 };
1013
1014 #undef DEFINE_EVENT
1015 #define DEFINE_EVENT(template, call, proto, args) \
1016 \
1017 static struct ftrace_event_call __used \
1018 __attribute__((__aligned__(4))) \
1019 __attribute__((section("_ftrace_events"))) event_##call = { \
1020 .name = #call, \
1021 .class = &event_class_##template, \
1022 .event.funcs = &ftrace_event_type_funcs_##template, \
1023 .print_fmt = print_fmt_##template, \
1024 };
1025
1026 #undef DEFINE_EVENT_PRINT
1027 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
1028 \
1029 static const char print_fmt_##call[] = print; \
1030 \
1031 static struct ftrace_event_call __used \
1032 __attribute__((__aligned__(4))) \
1033 __attribute__((section("_ftrace_events"))) event_##call = { \
1034 .name = #call, \
1035 .class = &event_class_##template, \
1036 .event.funcs = &ftrace_event_type_funcs_##call, \
1037 .print_fmt = print_fmt_##call, \
1038 }
1039
1040 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1041
1042 /*
1043 * Define the insertion callback to perf events
1044 *
1045 * The job is very similar to ftrace_raw_event_<call> except that we don't
1046 * insert in the ring buffer but in a perf counter.
1047 *
1048 * static void ftrace_perf_<call>(proto)
1049 * {
1050 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
1051 * struct ftrace_event_call *event_call = &event_<call>;
1052 * extern void perf_tp_event(int, u64, u64, void *, int);
1053 * struct ftrace_raw_##call *entry;
1054 * struct perf_trace_buf *trace_buf;
1055 * u64 __addr = 0, __count = 1;
1056 * unsigned long irq_flags;
1057 * struct trace_entry *ent;
1058 * int __entry_size;
1059 * int __data_size;
1060 * int __cpu
1061 * int pc;
1062 *
1063 * pc = preempt_count();
1064 *
1065 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
1066 *
1067 * // Below we want to get the aligned size by taking into account
1068 * // the u32 field that will later store the buffer size
1069 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
1070 * sizeof(u64));
1071 * __entry_size -= sizeof(u32);
1072 *
1073 * // Protect the non nmi buffer
1074 * // This also protects the rcu read side
1075 * local_irq_save(irq_flags);
1076 * __cpu = smp_processor_id();
1077 *
1078 * if (in_nmi())
1079 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
1080 * else
1081 * trace_buf = rcu_dereference_sched(perf_trace_buf);
1082 *
1083 * if (!trace_buf)
1084 * goto end;
1085 *
1086 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
1087 *
1088 * // Avoid recursion from perf that could mess up the buffer
1089 * if (trace_buf->recursion++)
1090 * goto end_recursion;
1091 *
1092 * raw_data = trace_buf->buf;
1093 *
1094 * // Make recursion update visible before entering perf_tp_event
1095 * // so that we protect from perf recursions.
1096 *
1097 * barrier();
1098 *
1099 * //zero dead bytes from alignment to avoid stack leak to userspace:
1100 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
1101 * entry = (struct ftrace_raw_<call> *)raw_data;
1102 * ent = &entry->ent;
1103 * tracing_generic_entry_update(ent, irq_flags, pc);
1104 * ent->type = event_call->id;
1105 *
1106 * <tstruct> <- do some jobs with dynamic arrays
1107 *
1108 * <assign> <- affect our values
1109 *
1110 * perf_tp_event(event_call->id, __addr, __count, entry,
1111 * __entry_size); <- submit them to perf counter
1112 *
1113 * }
1114 */
1115
1116 #ifdef CONFIG_PERF_EVENTS
1117
1118 #undef __entry
1119 #define __entry entry
1120
1121 #undef __get_dynamic_array
1122 #define __get_dynamic_array(field) \
1123 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
1124
1125 #undef __get_str
1126 #define __get_str(field) (char *)__get_dynamic_array(field)
1127
1128 #undef __perf_addr
1129 #define __perf_addr(a) __addr = (a)
1130
1131 #undef __perf_count
1132 #define __perf_count(c) __count = (c)
1133
1134 #undef DECLARE_EVENT_CLASS
1135 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
1136 static notrace void \
1137 perf_trace_##call(void *__data, proto) \
1138 { \
1139 struct ftrace_event_call *event_call = __data; \
1140 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
1141 struct ftrace_raw_##call *entry; \
1142 struct pt_regs __regs; \
1143 u64 __addr = 0, __count = 1; \
1144 struct hlist_head *head; \
1145 int __entry_size; \
1146 int __data_size; \
1147 int rctx; \
1148 \
1149 perf_fetch_caller_regs(&__regs); \
1150 \
1151 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
1152 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
1153 sizeof(u64)); \
1154 __entry_size -= sizeof(u32); \
1155 \
1156 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
1157 "profile buffer not large enough")) \
1158 return; \
1159 \
1160 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
1161 __entry_size, event_call->event.type, &__regs, &rctx); \
1162 if (!entry) \
1163 return; \
1164 \
1165 tstruct \
1166 \
1167 { assign; } \
1168 \
1169 head = this_cpu_ptr(event_call->perf_events); \
1170 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
1171 __count, &__regs, head); \
1172 }
1173
1174 /*
1175 * This part is compiled out, it is only here as a build time check
1176 * to make sure that if the tracepoint handling changes, the
1177 * perf probe will fail to compile unless it too is updated.
1178 */
1179 #undef DEFINE_EVENT
1180 #define DEFINE_EVENT(template, call, proto, args) \
1181 static inline void perf_test_probe_##call(void) \
1182 { \
1183 check_trace_callback_type_##call(perf_trace_##template); \
1184 }
1185
1186
1187 #undef DEFINE_EVENT_PRINT
1188 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
1189 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
1190
1191 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1192 #endif /* CONFIG_PERF_EVENTS */
1193
1194 #undef _TRACE_PROFILE_INIT
1195 #endif //0
LTTng 2.0/0.x modules
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