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Use dest field type instead of src for serialization output
[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, __alignof__(_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, __alignof__(_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, __alignof__(u32)); \
295 __event_len += sizeof(u32); \
296 __event_len += lib_ring_buffer_align(__event_len, __alignof__(_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, __alignof__(_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, __alignof__(_type));
346
347 #undef __dynamic_array
348 #define __dynamic_array(_type, _item, _length) \
349 __event_align = max_t(size_t, __event_align, __alignof__(u32)); \
350 __event_align = max_t(size_t, __event_align, __alignof__(_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 * Stage 6 of the trace events.
375 *
376 * Create structure declaration that allows the "assign" macros to access the
377 * field types.
378 */
379
380 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
381
382 /* Named field types must be defined in lttng-types.h */
383
384 #undef __field
385 #define __field(_type, _item) _type _item;
386
387 #undef __field_ext
388 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
389
390 #undef __array
391 #define __array(_type, _item, _length) _type _item;
392
393 #undef __dynamic_array
394 #define __dynamic_array(_type, _item, _length) _type _item;
395
396 #undef __string
397 #define __string(_item, _src) char _item;
398
399 #undef TP_STRUCT__entry
400 #define TP_STRUCT__entry(args...) args
401
402 #undef DECLARE_EVENT_CLASS
403 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
404 struct __event_typemap__##_name { \
405 _tstruct \
406 };
407
408 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
409
410
411 /*
412 * Stage 7 of the trace events.
413 *
414 * Create the probe function : call even size calculation and write event data
415 * into the buffer.
416 *
417 * We use both the field and assignment macros to write the fields in the order
418 * defined in the field declaration. The field declarations control the
419 * execution order, jumping to the appropriate assignment block.
420 */
421
422 #include "lttng-events-reset.h" /* Reset all macros within TRACE_EVENT */
423
424 #undef __field
425 #define __field(_type, _item) \
426 goto __assign_##_item; \
427 __end_field_##_item:
428
429 #undef __field_ext
430 #define __field_ext(_type, _item, _filter_type) __field(_type, _item)
431
432 #undef __array
433 #define __array(_type, _item, _length) \
434 goto __assign_##_item; \
435 __end_field_##_item:
436
437 #undef __dynamic_array
438 #define __dynamic_array(_type, _item, _length) \
439 goto __assign_##_item##_1; \
440 __end_field_##_item##_1: \
441 goto __assign_##_item##_2; \
442 __end_field_##_item##_2:
443
444 #undef __string
445 #define __string(_item, _src) \
446 goto __assign_##_item; \
447 __end_field_##_item:
448
449 /*
450 * Macros mapping tp_assign() to "=", tp_memcpy() to memcpy() and tp_strcpy() to
451 * strcpy().
452 */
453 #undef tp_assign
454 #define tp_assign(dest, src) \
455 __assign_##dest: \
456 { \
457 __typeof__(__typemap.dest) __tmp = (src); \
458 lib_ring_buffer_align_ctx(&ctx, __alignof__(__tmp)); \
459 __chan->ops->event_write(&ctx, &__tmp, sizeof(__tmp)); \
460 } \
461 goto __end_field_##dest;
462
463 #undef tp_memcpy
464 #define tp_memcpy(dest, src, len) \
465 __assign_##dest: \
466 lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest)); \
467 __chan->ops->event_write(&ctx, src, len); \
468 goto __end_field_##dest;
469
470 #undef tp_memcpy_dyn
471 #define tp_memcpy_dyn(dest, src, len) \
472 __assign_##dest##_1: \
473 { \
474 u32 __tmpl = (len); \
475 lib_ring_buffer_align_ctx(&ctx, __alignof__(u32)); \
476 __chan->ops->event_write(&ctx, &__tmpl, sizeof(u32)); \
477 } \
478 goto __end_field_##dest##_1; \
479 __assign_##dest##_2: \
480 lib_ring_buffer_align_ctx(&ctx, __alignof__(__typemap.dest)); \
481 __chan->ops->event_write(&ctx, src, len); \
482 goto __end_field_##dest##_2;
483
484 #undef tp_strcpy
485 #define tp_strcpy(dest, src) \
486 tp_memcpy(dest, src, __get_dynamic_array_len(dest))
487
488 /* Named field types must be defined in lttng-types.h */
489
490 #undef __get_str
491 #define __get_str(field) field
492
493 #undef __get_dynamic_array
494 #define __get_dynamic_array(field) field
495
496 /* Beware: this get len actually consumes the len value */
497 #undef __get_dynamic_array_len
498 #define __get_dynamic_array_len(field) __dynamic_len[__dynamic_len_idx++]
499
500 #undef TP_PROTO
501 #define TP_PROTO(args...) args
502
503 #undef TP_ARGS
504 #define TP_ARGS(args...) args
505
506 #undef TP_STRUCT__entry
507 #define TP_STRUCT__entry(args...) args
508
509 #undef TP_fast_assign
510 #define TP_fast_assign(args...) args
511
512 #undef DECLARE_EVENT_CLASS
513 #define DECLARE_EVENT_CLASS(_name, _proto, _args, _tstruct, _assign, _print) \
514 static void __event_probe__##_name(void *__data, _proto) \
515 { \
516 struct ltt_event *__event = __data; \
517 struct ltt_channel *__chan = __event->chan; \
518 struct lib_ring_buffer_ctx ctx; \
519 size_t __event_len, __event_align; \
520 size_t __dynamic_len_idx = 0; \
521 size_t __dynamic_len[ARRAY_SIZE(__event_fields___##_name)]; \
522 struct __event_typemap__##_name __typemap; \
523 int __ret; \
524 \
525 if (0) \
526 (void) __dynamic_len_idx; /* don't warn if unused */ \
527 __event_len = __event_get_size__##_name(__dynamic_len, _args); \
528 __event_align = __event_get_align__##_name(_args); \
529 lib_ring_buffer_ctx_init(&ctx, __chan->chan, NULL, __event_len, \
530 __event_align, -1); \
531 __ret = __chan->ops->event_reserve(&ctx); \
532 if (__ret < 0) \
533 return; \
534 /* Control code (field ordering) */ \
535 _tstruct \
536 __chan->ops->event_commit(&ctx); \
537 return; \
538 /* Copy code, steered by control code */ \
539 _assign \
540 }
541
542 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
543
544
545 #if 0
546
547 #include <linux/ftrace_event.h>
548
549 /*
550 * DECLARE_EVENT_CLASS can be used to add a generic function
551 * handlers for events. That is, if all events have the same
552 * parameters and just have distinct trace points.
553 * Each tracepoint can be defined with DEFINE_EVENT and that
554 * will map the DECLARE_EVENT_CLASS to the tracepoint.
555 *
556 * TRACE_EVENT is a one to one mapping between tracepoint and template.
557 */
558 #undef TRACE_EVENT
559 #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
560 DECLARE_EVENT_CLASS(name, \
561 PARAMS(proto), \
562 PARAMS(args), \
563 PARAMS(tstruct), \
564 PARAMS(assign), \
565 PARAMS(print)); \
566 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
567
568
569 #undef __field
570 #define __field(type, item) type item;
571
572 #undef __field_ext
573 #define __field_ext(type, item, filter_type) type item;
574
575 #undef __array
576 #define __array(type, item, len) type item[len];
577
578 #undef __dynamic_array
579 #define __dynamic_array(type, item, len) u32 __data_loc_##item;
580
581 #undef __string
582 #define __string(item, src) __dynamic_array(char, item, -1)
583
584 #undef TP_STRUCT__entry
585 #define TP_STRUCT__entry(args...) args
586
587 #undef DECLARE_EVENT_CLASS
588 #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
589 struct ftrace_raw_##name { \
590 struct trace_entry ent; \
591 tstruct \
592 char __data[0]; \
593 }; \
594 \
595 static struct ftrace_event_class event_class_##name;
596
597 #undef DEFINE_EVENT
598 #define DEFINE_EVENT(template, name, proto, args) \
599 static struct ftrace_event_call __used \
600 __attribute__((__aligned__(4))) event_##name
601
602 #undef DEFINE_EVENT_PRINT
603 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
604 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
605
606 /* Callbacks are meaningless to ftrace. */
607 #undef TRACE_EVENT_FN
608 #define TRACE_EVENT_FN(name, proto, args, tstruct, \
609 assign, print, reg, unreg) \
610 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
611 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
612
613 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
614
615
616 /*
617 * Stage 2 of the trace events.
618 *
619 * Create static inline function that calculates event size.
620 */
621
622 #undef __field
623 #define __field(type, item)
624
625 #undef __field_ext
626 #define __field_ext(type, item, filter_type)
627
628 #undef __array
629 #define __array(type, item, len)
630
631 #undef __dynamic_array
632 #define __dynamic_array(type, item, len) u32 item;
633
634 #undef __string
635 #define __string(item, src) __dynamic_array(char, item, -1)
636
637 #undef DECLARE_EVENT_CLASS
638 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
639 struct ftrace_data_offsets_##call { \
640 tstruct; \
641 };
642
643 #undef DEFINE_EVENT
644 #define DEFINE_EVENT(template, name, proto, args)
645
646 #undef DEFINE_EVENT_PRINT
647 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
648 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
649
650 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
651
652 /*
653 * Stage 3 of the trace events.
654 *
655 * Create the probe function : call even size calculation and write event data
656 * into the buffer.
657 */
658
659 #undef __entry
660 #define __entry field
661
662 #undef TP_printk
663 #define TP_printk(fmt, args...) fmt "\n", args
664
665 #undef __get_dynamic_array
666 #define __get_dynamic_array(field) \
667 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
668
669 #undef __get_str
670 #define __get_str(field) (char *)__get_dynamic_array(field)
671
672 #undef __print_flags
673 #define __print_flags(flag, delim, flag_array...) \
674 ({ \
675 static const struct trace_print_flags __flags[] = \
676 { flag_array, { -1, NULL }}; \
677 ftrace_print_flags_seq(p, delim, flag, __flags); \
678 })
679
680 #undef __print_symbolic
681 #define __print_symbolic(value, symbol_array...) \
682 ({ \
683 static const struct trace_print_flags symbols[] = \
684 { symbol_array, { -1, NULL }}; \
685 ftrace_print_symbols_seq(p, value, symbols); \
686 })
687
688 #undef __print_hex
689 #define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
690
691 #undef DECLARE_EVENT_CLASS
692 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
693 static notrace enum print_line_t \
694 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
695 struct trace_event *trace_event) \
696 { \
697 struct ftrace_event_call *event; \
698 struct trace_seq *s = &iter->seq; \
699 struct ftrace_raw_##call *field; \
700 struct trace_entry *entry; \
701 struct trace_seq *p = &iter->tmp_seq; \
702 int ret; \
703 \
704 event = container_of(trace_event, struct ftrace_event_call, \
705 event); \
706 \
707 entry = iter->ent; \
708 \
709 if (entry->type != event->event.type) { \
710 WARN_ON_ONCE(1); \
711 return TRACE_TYPE_UNHANDLED; \
712 } \
713 \
714 field = (typeof(field))entry; \
715 \
716 trace_seq_init(p); \
717 ret = trace_seq_printf(s, "%s: ", event->name); \
718 if (ret) \
719 ret = trace_seq_printf(s, print); \
720 if (!ret) \
721 return TRACE_TYPE_PARTIAL_LINE; \
722 \
723 return TRACE_TYPE_HANDLED; \
724 } \
725 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
726 .trace = ftrace_raw_output_##call, \
727 };
728
729 #undef DEFINE_EVENT_PRINT
730 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
731 static notrace enum print_line_t \
732 ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
733 struct trace_event *event) \
734 { \
735 struct trace_seq *s = &iter->seq; \
736 struct ftrace_raw_##template *field; \
737 struct trace_entry *entry; \
738 struct trace_seq *p = &iter->tmp_seq; \
739 int ret; \
740 \
741 entry = iter->ent; \
742 \
743 if (entry->type != event_##call.event.type) { \
744 WARN_ON_ONCE(1); \
745 return TRACE_TYPE_UNHANDLED; \
746 } \
747 \
748 field = (typeof(field))entry; \
749 \
750 trace_seq_init(p); \
751 ret = trace_seq_printf(s, "%s: ", #call); \
752 if (ret) \
753 ret = trace_seq_printf(s, print); \
754 if (!ret) \
755 return TRACE_TYPE_PARTIAL_LINE; \
756 \
757 return TRACE_TYPE_HANDLED; \
758 } \
759 static struct trace_event_functions ftrace_event_type_funcs_##call = { \
760 .trace = ftrace_raw_output_##call, \
761 };
762
763 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
764
765 #undef __field_ext
766 #define __field_ext(type, item, filter_type) \
767 ret = trace_define_field(event_call, #type, #item, \
768 offsetof(typeof(field), item), \
769 sizeof(field.item), \
770 is_signed_type(type), filter_type); \
771 if (ret) \
772 return ret;
773
774 #undef __field
775 #define __field(type, item) __field_ext(type, item, FILTER_OTHER)
776
777 #undef __array
778 #define __array(type, item, len) \
779 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
780 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
781 offsetof(typeof(field), item), \
782 sizeof(field.item), \
783 is_signed_type(type), FILTER_OTHER); \
784 if (ret) \
785 return ret;
786
787 #undef __dynamic_array
788 #define __dynamic_array(type, item, len) \
789 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
790 offsetof(typeof(field), __data_loc_##item), \
791 sizeof(field.__data_loc_##item), \
792 is_signed_type(type), FILTER_OTHER);
793
794 #undef __string
795 #define __string(item, src) __dynamic_array(char, item, -1)
796
797 #undef DECLARE_EVENT_CLASS
798 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
799 static int notrace \
800 ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
801 { \
802 struct ftrace_raw_##call field; \
803 int ret; \
804 \
805 tstruct; \
806 \
807 return ret; \
808 }
809
810 #undef DEFINE_EVENT
811 #define DEFINE_EVENT(template, name, proto, args)
812
813 #undef DEFINE_EVENT_PRINT
814 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
815 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
816
817 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
818
819 /*
820 * remember the offset of each array from the beginning of the event.
821 */
822
823 #undef __entry
824 #define __entry entry
825
826 #undef __field
827 #define __field(type, item)
828
829 #undef __field_ext
830 #define __field_ext(type, item, filter_type)
831
832 #undef __array
833 #define __array(type, item, len)
834
835 #undef __dynamic_array
836 #define __dynamic_array(type, item, len) \
837 __data_offsets->item = __data_size + \
838 offsetof(typeof(*entry), __data); \
839 __data_offsets->item |= (len * sizeof(type)) << 16; \
840 __data_size += (len) * sizeof(type);
841
842 #undef __string
843 #define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
844
845 #undef DECLARE_EVENT_CLASS
846 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
847 static inline notrace int ftrace_get_offsets_##call( \
848 struct ftrace_data_offsets_##call *__data_offsets, proto) \
849 { \
850 int __data_size = 0; \
851 struct ftrace_raw_##call __maybe_unused *entry; \
852 \
853 tstruct; \
854 \
855 return __data_size; \
856 }
857
858 #undef DEFINE_EVENT
859 #define DEFINE_EVENT(template, name, proto, args)
860
861 #undef DEFINE_EVENT_PRINT
862 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
863 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
864
865 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
866
867 /*
868 * Stage 4 of the trace events.
869 *
870 * Override the macros in <trace/trace_events.h> to include the following:
871 *
872 * For those macros defined with TRACE_EVENT:
873 *
874 * static struct ftrace_event_call event_<call>;
875 *
876 * static void ftrace_raw_event_<call>(void *__data, proto)
877 * {
878 * struct ftrace_event_call *event_call = __data;
879 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
880 * struct ring_buffer_event *event;
881 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
882 * struct ring_buffer *buffer;
883 * unsigned long irq_flags;
884 * int __data_size;
885 * int pc;
886 *
887 * local_save_flags(irq_flags);
888 * pc = preempt_count();
889 *
890 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
891 *
892 * event = trace_current_buffer_lock_reserve(&buffer,
893 * event_<call>->event.type,
894 * sizeof(*entry) + __data_size,
895 * irq_flags, pc);
896 * if (!event)
897 * return;
898 * entry = ring_buffer_event_data(event);
899 *
900 * { <assign>; } <-- Here we assign the entries by the __field and
901 * __array macros.
902 *
903 * if (!filter_current_check_discard(buffer, event_call, entry, event))
904 * trace_current_buffer_unlock_commit(buffer,
905 * event, irq_flags, pc);
906 * }
907 *
908 * static struct trace_event ftrace_event_type_<call> = {
909 * .trace = ftrace_raw_output_<call>, <-- stage 2
910 * };
911 *
912 * static const char print_fmt_<call>[] = <TP_printk>;
913 *
914 * static struct ftrace_event_class __used event_class_<template> = {
915 * .system = "<system>",
916 * .define_fields = ftrace_define_fields_<call>,
917 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
918 * .raw_init = trace_event_raw_init,
919 * .probe = ftrace_raw_event_##call,
920 * .reg = ftrace_event_reg,
921 * };
922 *
923 * static struct ftrace_event_call __used
924 * __attribute__((__aligned__(4)))
925 * __attribute__((section("_ftrace_events"))) event_<call> = {
926 * .name = "<call>",
927 * .class = event_class_<template>,
928 * .event = &ftrace_event_type_<call>,
929 * .print_fmt = print_fmt_<call>,
930 * };
931 *
932 */
933
934 #ifdef CONFIG_PERF_EVENTS
935
936 #define _TRACE_PERF_PROTO(call, proto) \
937 static notrace void \
938 perf_trace_##call(void *__data, proto);
939
940 #define _TRACE_PERF_INIT(call) \
941 .perf_probe = perf_trace_##call,
942
943 #else
944 #define _TRACE_PERF_PROTO(call, proto)
945 #define _TRACE_PERF_INIT(call)
946 #endif /* CONFIG_PERF_EVENTS */
947
948 #undef __entry
949 #define __entry entry
950
951 #undef __field
952 #define __field(type, item)
953
954 #undef __array
955 #define __array(type, item, len)
956
957 #undef __dynamic_array
958 #define __dynamic_array(type, item, len) \
959 __entry->__data_loc_##item = __data_offsets.item;
960
961 #undef __string
962 #define __string(item, src) __dynamic_array(char, item, -1) \
963
964 #undef __assign_str
965 #define __assign_str(dst, src) \
966 strcpy(__get_str(dst), src);
967
968 #undef TP_fast_assign
969 #define TP_fast_assign(args...) args
970
971 #undef TP_perf_assign
972 #define TP_perf_assign(args...)
973
974 #undef DECLARE_EVENT_CLASS
975 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
976 \
977 static notrace void \
978 ftrace_raw_event_##call(void *__data, proto) \
979 { \
980 struct ftrace_event_call *event_call = __data; \
981 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
982 struct ring_buffer_event *event; \
983 struct ftrace_raw_##call *entry; \
984 struct ring_buffer *buffer; \
985 unsigned long irq_flags; \
986 int __data_size; \
987 int pc; \
988 \
989 local_save_flags(irq_flags); \
990 pc = preempt_count(); \
991 \
992 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
993 \
994 event = trace_current_buffer_lock_reserve(&buffer, \
995 event_call->event.type, \
996 sizeof(*entry) + __data_size, \
997 irq_flags, pc); \
998 if (!event) \
999 return; \
1000 entry = ring_buffer_event_data(event); \
1001 \
1002 tstruct \
1003 \
1004 { assign; } \
1005 \
1006 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
1007 trace_nowake_buffer_unlock_commit(buffer, \
1008 event, irq_flags, pc); \
1009 }
1010 /*
1011 * The ftrace_test_probe is compiled out, it is only here as a build time check
1012 * to make sure that if the tracepoint handling changes, the ftrace probe will
1013 * fail to compile unless it too is updated.
1014 */
1015
1016 #undef DEFINE_EVENT
1017 #define DEFINE_EVENT(template, call, proto, args) \
1018 static inline void ftrace_test_probe_##call(void) \
1019 { \
1020 check_trace_callback_type_##call(ftrace_raw_event_##template); \
1021 }
1022
1023 #undef DEFINE_EVENT_PRINT
1024 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)
1025
1026 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1027
1028 #undef __entry
1029 #define __entry REC
1030
1031 #undef __print_flags
1032 #undef __print_symbolic
1033 #undef __get_dynamic_array
1034 #undef __get_str
1035
1036 #undef TP_printk
1037 #define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
1038
1039 #undef DECLARE_EVENT_CLASS
1040 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
1041 _TRACE_PERF_PROTO(call, PARAMS(proto)); \
1042 static const char print_fmt_##call[] = print; \
1043 static struct ftrace_event_class __used event_class_##call = { \
1044 .system = __stringify(TRACE_SYSTEM), \
1045 .define_fields = ftrace_define_fields_##call, \
1046 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
1047 .raw_init = trace_event_raw_init, \
1048 .probe = ftrace_raw_event_##call, \
1049 .reg = ftrace_event_reg, \
1050 _TRACE_PERF_INIT(call) \
1051 };
1052
1053 #undef DEFINE_EVENT
1054 #define DEFINE_EVENT(template, call, proto, args) \
1055 \
1056 static struct ftrace_event_call __used \
1057 __attribute__((__aligned__(4))) \
1058 __attribute__((section("_ftrace_events"))) event_##call = { \
1059 .name = #call, \
1060 .class = &event_class_##template, \
1061 .event.funcs = &ftrace_event_type_funcs_##template, \
1062 .print_fmt = print_fmt_##template, \
1063 };
1064
1065 #undef DEFINE_EVENT_PRINT
1066 #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
1067 \
1068 static const char print_fmt_##call[] = print; \
1069 \
1070 static struct ftrace_event_call __used \
1071 __attribute__((__aligned__(4))) \
1072 __attribute__((section("_ftrace_events"))) event_##call = { \
1073 .name = #call, \
1074 .class = &event_class_##template, \
1075 .event.funcs = &ftrace_event_type_funcs_##call, \
1076 .print_fmt = print_fmt_##call, \
1077 }
1078
1079 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1080
1081 /*
1082 * Define the insertion callback to perf events
1083 *
1084 * The job is very similar to ftrace_raw_event_<call> except that we don't
1085 * insert in the ring buffer but in a perf counter.
1086 *
1087 * static void ftrace_perf_<call>(proto)
1088 * {
1089 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
1090 * struct ftrace_event_call *event_call = &event_<call>;
1091 * extern void perf_tp_event(int, u64, u64, void *, int);
1092 * struct ftrace_raw_##call *entry;
1093 * struct perf_trace_buf *trace_buf;
1094 * u64 __addr = 0, __count = 1;
1095 * unsigned long irq_flags;
1096 * struct trace_entry *ent;
1097 * int __entry_size;
1098 * int __data_size;
1099 * int __cpu
1100 * int pc;
1101 *
1102 * pc = preempt_count();
1103 *
1104 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
1105 *
1106 * // Below we want to get the aligned size by taking into account
1107 * // the u32 field that will later store the buffer size
1108 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
1109 * sizeof(u64));
1110 * __entry_size -= sizeof(u32);
1111 *
1112 * // Protect the non nmi buffer
1113 * // This also protects the rcu read side
1114 * local_irq_save(irq_flags);
1115 * __cpu = smp_processor_id();
1116 *
1117 * if (in_nmi())
1118 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
1119 * else
1120 * trace_buf = rcu_dereference_sched(perf_trace_buf);
1121 *
1122 * if (!trace_buf)
1123 * goto end;
1124 *
1125 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
1126 *
1127 * // Avoid recursion from perf that could mess up the buffer
1128 * if (trace_buf->recursion++)
1129 * goto end_recursion;
1130 *
1131 * raw_data = trace_buf->buf;
1132 *
1133 * // Make recursion update visible before entering perf_tp_event
1134 * // so that we protect from perf recursions.
1135 *
1136 * barrier();
1137 *
1138 * //zero dead bytes from alignment to avoid stack leak to userspace:
1139 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
1140 * entry = (struct ftrace_raw_<call> *)raw_data;
1141 * ent = &entry->ent;
1142 * tracing_generic_entry_update(ent, irq_flags, pc);
1143 * ent->type = event_call->id;
1144 *
1145 * <tstruct> <- do some jobs with dynamic arrays
1146 *
1147 * <assign> <- affect our values
1148 *
1149 * perf_tp_event(event_call->id, __addr, __count, entry,
1150 * __entry_size); <- submit them to perf counter
1151 *
1152 * }
1153 */
1154
1155 #ifdef CONFIG_PERF_EVENTS
1156
1157 #undef __entry
1158 #define __entry entry
1159
1160 #undef __get_dynamic_array
1161 #define __get_dynamic_array(field) \
1162 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
1163
1164 #undef __get_str
1165 #define __get_str(field) (char *)__get_dynamic_array(field)
1166
1167 #undef __perf_addr
1168 #define __perf_addr(a) __addr = (a)
1169
1170 #undef __perf_count
1171 #define __perf_count(c) __count = (c)
1172
1173 #undef DECLARE_EVENT_CLASS
1174 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
1175 static notrace void \
1176 perf_trace_##call(void *__data, proto) \
1177 { \
1178 struct ftrace_event_call *event_call = __data; \
1179 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
1180 struct ftrace_raw_##call *entry; \
1181 struct pt_regs __regs; \
1182 u64 __addr = 0, __count = 1; \
1183 struct hlist_head *head; \
1184 int __entry_size; \
1185 int __data_size; \
1186 int rctx; \
1187 \
1188 perf_fetch_caller_regs(&__regs); \
1189 \
1190 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
1191 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
1192 sizeof(u64)); \
1193 __entry_size -= sizeof(u32); \
1194 \
1195 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
1196 "profile buffer not large enough")) \
1197 return; \
1198 \
1199 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
1200 __entry_size, event_call->event.type, &__regs, &rctx); \
1201 if (!entry) \
1202 return; \
1203 \
1204 tstruct \
1205 \
1206 { assign; } \
1207 \
1208 head = this_cpu_ptr(event_call->perf_events); \
1209 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
1210 __count, &__regs, head); \
1211 }
1212
1213 /*
1214 * This part is compiled out, it is only here as a build time check
1215 * to make sure that if the tracepoint handling changes, the
1216 * perf probe will fail to compile unless it too is updated.
1217 */
1218 #undef DEFINE_EVENT
1219 #define DEFINE_EVENT(template, call, proto, args) \
1220 static inline void perf_test_probe_##call(void) \
1221 { \
1222 check_trace_callback_type_##call(perf_trace_##template); \
1223 }
1224
1225
1226 #undef DEFINE_EVENT_PRINT
1227 #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
1228 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
1229
1230 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
1231 #endif /* CONFIG_PERF_EVENTS */
1232
1233 #undef _TRACE_PROFILE_INIT
1234 #endif //0
LTTng 2.0/0.x modules
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