aboutsummaryrefslogtreecommitdiffstats
path: root/include/trace/ftrace.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/trace/ftrace.h')
-rw-r--r--include/trace/ftrace.h276
1 files changed, 220 insertions, 56 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 1867553c61e5..308bafd93325 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -21,11 +21,14 @@
21#undef __field 21#undef __field
22#define __field(type, item) type item; 22#define __field(type, item) type item;
23 23
24#undef __field_ext
25#define __field_ext(type, item, filter_type) type item;
26
24#undef __array 27#undef __array
25#define __array(type, item, len) type item[len]; 28#define __array(type, item, len) type item[len];
26 29
27#undef __dynamic_array 30#undef __dynamic_array
28#define __dynamic_array(type, item, len) unsigned short __data_loc_##item; 31#define __dynamic_array(type, item, len) u32 __data_loc_##item;
29 32
30#undef __string 33#undef __string
31#define __string(item, src) __dynamic_array(char, item, -1) 34#define __string(item, src) __dynamic_array(char, item, -1)
@@ -42,6 +45,16 @@
42 }; \ 45 }; \
43 static struct ftrace_event_call event_##name 46 static struct ftrace_event_call event_##name
44 47
48#undef __cpparg
49#define __cpparg(arg...) arg
50
51/* Callbacks are meaningless to ftrace. */
52#undef TRACE_EVENT_FN
53#define TRACE_EVENT_FN(name, proto, args, tstruct, \
54 assign, print, reg, unreg) \
55 TRACE_EVENT(name, __cpparg(proto), __cpparg(args), \
56 __cpparg(tstruct), __cpparg(assign), __cpparg(print)) \
57
45#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 58#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
46 59
47 60
@@ -51,23 +64,27 @@
51 * Include the following: 64 * Include the following:
52 * 65 *
53 * struct ftrace_data_offsets_<call> { 66 * struct ftrace_data_offsets_<call> {
54 * int <item1>; 67 * u32 <item1>;
55 * int <item2>; 68 * u32 <item2>;
56 * [...] 69 * [...]
57 * }; 70 * };
58 * 71 *
59 * The __dynamic_array() macro will create each int <item>, this is 72 * The __dynamic_array() macro will create each u32 <item>, this is
60 * to keep the offset of each array from the beginning of the event. 73 * to keep the offset of each array from the beginning of the event.
74 * The size of an array is also encoded, in the higher 16 bits of <item>.
61 */ 75 */
62 76
63#undef __field 77#undef __field
64#define __field(type, item); 78#define __field(type, item)
79
80#undef __field_ext
81#define __field_ext(type, item, filter_type)
65 82
66#undef __array 83#undef __array
67#define __array(type, item, len) 84#define __array(type, item, len)
68 85
69#undef __dynamic_array 86#undef __dynamic_array
70#define __dynamic_array(type, item, len) int item; 87#define __dynamic_array(type, item, len) u32 item;
71 88
72#undef __string 89#undef __string
73#define __string(item, src) __dynamic_array(char, item, -1) 90#define __string(item, src) __dynamic_array(char, item, -1)
@@ -109,6 +126,9 @@
109 if (!ret) \ 126 if (!ret) \
110 return 0; 127 return 0;
111 128
129#undef __field_ext
130#define __field_ext(type, item, filter_type) __field(type, item)
131
112#undef __array 132#undef __array
113#define __array(type, item, len) \ 133#define __array(type, item, len) \
114 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ 134 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
@@ -120,7 +140,7 @@
120 140
121#undef __dynamic_array 141#undef __dynamic_array
122#define __dynamic_array(type, item, len) \ 142#define __dynamic_array(type, item, len) \
123 ret = trace_seq_printf(s, "\tfield:__data_loc " #item ";\t" \ 143 ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
124 "offset:%u;\tsize:%u;\n", \ 144 "offset:%u;\tsize:%u;\n", \
125 (unsigned int)offsetof(typeof(field), \ 145 (unsigned int)offsetof(typeof(field), \
126 __data_loc_##item), \ 146 __data_loc_##item), \
@@ -144,10 +164,14 @@
144#undef TP_fast_assign 164#undef TP_fast_assign
145#define TP_fast_assign(args...) args 165#define TP_fast_assign(args...) args
146 166
167#undef TP_perf_assign
168#define TP_perf_assign(args...)
169
147#undef TRACE_EVENT 170#undef TRACE_EVENT
148#define TRACE_EVENT(call, proto, args, tstruct, func, print) \ 171#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
149static int \ 172static int \
150ftrace_format_##call(struct trace_seq *s) \ 173ftrace_format_##call(struct ftrace_event_call *unused, \
174 struct trace_seq *s) \
151{ \ 175{ \
152 struct ftrace_raw_##call field __attribute__((unused)); \ 176 struct ftrace_raw_##call field __attribute__((unused)); \
153 int ret = 0; \ 177 int ret = 0; \
@@ -207,7 +231,7 @@ ftrace_format_##call(struct trace_seq *s) \
207 231
208#undef __get_dynamic_array 232#undef __get_dynamic_array
209#define __get_dynamic_array(field) \ 233#define __get_dynamic_array(field) \
210 ((void *)__entry + __entry->__data_loc_##field) 234 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
211 235
212#undef __get_str 236#undef __get_str
213#define __get_str(field) (char *)__get_dynamic_array(field) 237#define __get_str(field) (char *)__get_dynamic_array(field)
@@ -260,28 +284,33 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
260 284
261#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 285#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
262 286
263#undef __field 287#undef __field_ext
264#define __field(type, item) \ 288#define __field_ext(type, item, filter_type) \
265 ret = trace_define_field(event_call, #type, #item, \ 289 ret = trace_define_field(event_call, #type, #item, \
266 offsetof(typeof(field), item), \ 290 offsetof(typeof(field), item), \
267 sizeof(field.item), is_signed_type(type)); \ 291 sizeof(field.item), \
292 is_signed_type(type), filter_type); \
268 if (ret) \ 293 if (ret) \
269 return ret; 294 return ret;
270 295
296#undef __field
297#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
298
271#undef __array 299#undef __array
272#define __array(type, item, len) \ 300#define __array(type, item, len) \
273 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ 301 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
274 ret = trace_define_field(event_call, #type "[" #len "]", #item, \ 302 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
275 offsetof(typeof(field), item), \ 303 offsetof(typeof(field), item), \
276 sizeof(field.item), 0); \ 304 sizeof(field.item), 0, FILTER_OTHER); \
277 if (ret) \ 305 if (ret) \
278 return ret; 306 return ret;
279 307
280#undef __dynamic_array 308#undef __dynamic_array
281#define __dynamic_array(type, item, len) \ 309#define __dynamic_array(type, item, len) \
282 ret = trace_define_field(event_call, "__data_loc" "[" #type "]", #item,\ 310 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
283 offsetof(typeof(field), __data_loc_##item), \ 311 offsetof(typeof(field), __data_loc_##item), \
284 sizeof(field.__data_loc_##item), 0); 312 sizeof(field.__data_loc_##item), 0, \
313 FILTER_OTHER);
285 314
286#undef __string 315#undef __string
287#define __string(item, src) __dynamic_array(char, item, -1) 316#define __string(item, src) __dynamic_array(char, item, -1)
@@ -289,17 +318,14 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
289#undef TRACE_EVENT 318#undef TRACE_EVENT
290#define TRACE_EVENT(call, proto, args, tstruct, func, print) \ 319#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
291int \ 320int \
292ftrace_define_fields_##call(void) \ 321ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
293{ \ 322{ \
294 struct ftrace_raw_##call field; \ 323 struct ftrace_raw_##call field; \
295 struct ftrace_event_call *event_call = &event_##call; \
296 int ret; \ 324 int ret; \
297 \ 325 \
298 __common_field(int, type, 1); \ 326 ret = trace_define_common_fields(event_call); \
299 __common_field(unsigned char, flags, 0); \ 327 if (ret) \
300 __common_field(unsigned char, preempt_count, 0); \ 328 return ret; \
301 __common_field(int, pid, 1); \
302 __common_field(int, tgid, 1); \
303 \ 329 \
304 tstruct; \ 330 tstruct; \
305 \ 331 \
@@ -318,6 +344,9 @@ ftrace_define_fields_##call(void) \
318#undef __field 344#undef __field
319#define __field(type, item) 345#define __field(type, item)
320 346
347#undef __field_ext
348#define __field_ext(type, item, filter_type)
349
321#undef __array 350#undef __array
322#define __array(type, item, len) 351#define __array(type, item, len)
323 352
@@ -325,6 +354,7 @@ ftrace_define_fields_##call(void) \
325#define __dynamic_array(type, item, len) \ 354#define __dynamic_array(type, item, len) \
326 __data_offsets->item = __data_size + \ 355 __data_offsets->item = __data_size + \
327 offsetof(typeof(*entry), __data); \ 356 offsetof(typeof(*entry), __data); \
357 __data_offsets->item |= (len * sizeof(type)) << 16; \
328 __data_size += (len) * sizeof(type); 358 __data_size += (len) * sizeof(type);
329 359
330#undef __string 360#undef __string
@@ -345,6 +375,56 @@ static inline int ftrace_get_offsets_##call( \
345 375
346#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 376#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
347 377
378#ifdef CONFIG_EVENT_PROFILE
379
380/*
381 * Generate the functions needed for tracepoint perf_counter support.
382 *
383 * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
384 *
385 * static int ftrace_profile_enable_<call>(struct ftrace_event_call *event_call)
386 * {
387 * int ret = 0;
388 *
389 * if (!atomic_inc_return(&event_call->profile_count))
390 * ret = register_trace_<call>(ftrace_profile_<call>);
391 *
392 * return ret;
393 * }
394 *
395 * static void ftrace_profile_disable_<call>(struct ftrace_event_call *event_call)
396 * {
397 * if (atomic_add_negative(-1, &event->call->profile_count))
398 * unregister_trace_<call>(ftrace_profile_<call>);
399 * }
400 *
401 */
402
403#undef TRACE_EVENT
404#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
405 \
406static void ftrace_profile_##call(proto); \
407 \
408static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
409{ \
410 int ret = 0; \
411 \
412 if (!atomic_inc_return(&event_call->profile_count)) \
413 ret = register_trace_##call(ftrace_profile_##call); \
414 \
415 return ret; \
416} \
417 \
418static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
419{ \
420 if (atomic_add_negative(-1, &event_call->profile_count)) \
421 unregister_trace_##call(ftrace_profile_##call); \
422}
423
424#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
425
426#endif
427
348/* 428/*
349 * Stage 4 of the trace events. 429 * Stage 4 of the trace events.
350 * 430 *
@@ -380,13 +460,15 @@ static inline int ftrace_get_offsets_##call( \
380 * { 460 * {
381 * struct ring_buffer_event *event; 461 * struct ring_buffer_event *event;
382 * struct ftrace_raw_<call> *entry; <-- defined in stage 1 462 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
463 * struct ring_buffer *buffer;
383 * unsigned long irq_flags; 464 * unsigned long irq_flags;
384 * int pc; 465 * int pc;
385 * 466 *
386 * local_save_flags(irq_flags); 467 * local_save_flags(irq_flags);
387 * pc = preempt_count(); 468 * pc = preempt_count();
388 * 469 *
389 * event = trace_current_buffer_lock_reserve(event_<call>.id, 470 * event = trace_current_buffer_lock_reserve(&buffer,
471 * event_<call>.id,
390 * sizeof(struct ftrace_raw_<call>), 472 * sizeof(struct ftrace_raw_<call>),
391 * irq_flags, pc); 473 * irq_flags, pc);
392 * if (!event) 474 * if (!event)
@@ -396,7 +478,7 @@ static inline int ftrace_get_offsets_##call( \
396 * <assign>; <-- Here we assign the entries by the __field and 478 * <assign>; <-- Here we assign the entries by the __field and
397 * __array macros. 479 * __array macros.
398 * 480 *
399 * trace_current_buffer_unlock_commit(event, irq_flags, pc); 481 * trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
400 * } 482 * }
401 * 483 *
402 * static int ftrace_raw_reg_event_<call>(void) 484 * static int ftrace_raw_reg_event_<call>(void)
@@ -447,28 +529,6 @@ static inline int ftrace_get_offsets_##call( \
447#define TP_FMT(fmt, args...) fmt "\n", ##args 529#define TP_FMT(fmt, args...) fmt "\n", ##args
448 530
449#ifdef CONFIG_EVENT_PROFILE 531#ifdef CONFIG_EVENT_PROFILE
450#define _TRACE_PROFILE(call, proto, args) \
451static void ftrace_profile_##call(proto) \
452{ \
453 extern void perf_tpcounter_event(int); \
454 perf_tpcounter_event(event_##call.id); \
455} \
456 \
457static int ftrace_profile_enable_##call(struct ftrace_event_call *event_call) \
458{ \
459 int ret = 0; \
460 \
461 if (!atomic_inc_return(&event_call->profile_count)) \
462 ret = register_trace_##call(ftrace_profile_##call); \
463 \
464 return ret; \
465} \
466 \
467static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
468{ \
469 if (atomic_add_negative(-1, &event_call->profile_count)) \
470 unregister_trace_##call(ftrace_profile_##call); \
471}
472 532
473#define _TRACE_PROFILE_INIT(call) \ 533#define _TRACE_PROFILE_INIT(call) \
474 .profile_count = ATOMIC_INIT(-1), \ 534 .profile_count = ATOMIC_INIT(-1), \
@@ -476,7 +536,6 @@ static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
476 .profile_disable = ftrace_profile_disable_##call, 536 .profile_disable = ftrace_profile_disable_##call,
477 537
478#else 538#else
479#define _TRACE_PROFILE(call, proto, args)
480#define _TRACE_PROFILE_INIT(call) 539#define _TRACE_PROFILE_INIT(call)
481#endif 540#endif
482 541
@@ -502,7 +561,6 @@ static void ftrace_profile_disable_##call(struct ftrace_event_call *event_call)\
502 561
503#undef TRACE_EVENT 562#undef TRACE_EVENT
504#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \ 563#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
505_TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \
506 \ 564 \
507static struct ftrace_event_call event_##call; \ 565static struct ftrace_event_call event_##call; \
508 \ 566 \
@@ -512,6 +570,7 @@ static void ftrace_raw_event_##call(proto) \
512 struct ftrace_event_call *event_call = &event_##call; \ 570 struct ftrace_event_call *event_call = &event_##call; \
513 struct ring_buffer_event *event; \ 571 struct ring_buffer_event *event; \
514 struct ftrace_raw_##call *entry; \ 572 struct ftrace_raw_##call *entry; \
573 struct ring_buffer *buffer; \
515 unsigned long irq_flags; \ 574 unsigned long irq_flags; \
516 int __data_size; \ 575 int __data_size; \
517 int pc; \ 576 int pc; \
@@ -521,7 +580,8 @@ static void ftrace_raw_event_##call(proto) \
521 \ 580 \
522 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ 581 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
523 \ 582 \
524 event = trace_current_buffer_lock_reserve(event_##call.id, \ 583 event = trace_current_buffer_lock_reserve(&buffer, \
584 event_##call.id, \
525 sizeof(*entry) + __data_size, \ 585 sizeof(*entry) + __data_size, \
526 irq_flags, pc); \ 586 irq_flags, pc); \
527 if (!event) \ 587 if (!event) \
@@ -533,11 +593,12 @@ static void ftrace_raw_event_##call(proto) \
533 \ 593 \
534 { assign; } \ 594 { assign; } \
535 \ 595 \
536 if (!filter_current_check_discard(event_call, entry, event)) \ 596 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
537 trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \ 597 trace_nowake_buffer_unlock_commit(buffer, \
598 event, irq_flags, pc); \
538} \ 599} \
539 \ 600 \
540static int ftrace_raw_reg_event_##call(void) \ 601static int ftrace_raw_reg_event_##call(void *ptr) \
541{ \ 602{ \
542 int ret; \ 603 int ret; \
543 \ 604 \
@@ -548,7 +609,7 @@ static int ftrace_raw_reg_event_##call(void) \
548 return ret; \ 609 return ret; \
549} \ 610} \
550 \ 611 \
551static void ftrace_raw_unreg_event_##call(void) \ 612static void ftrace_raw_unreg_event_##call(void *ptr) \
552{ \ 613{ \
553 unregister_trace_##call(ftrace_raw_event_##call); \ 614 unregister_trace_##call(ftrace_raw_event_##call); \
554} \ 615} \
@@ -566,7 +627,6 @@ static int ftrace_raw_init_event_##call(void) \
566 return -ENODEV; \ 627 return -ENODEV; \
567 event_##call.id = id; \ 628 event_##call.id = id; \
568 INIT_LIST_HEAD(&event_##call.fields); \ 629 INIT_LIST_HEAD(&event_##call.fields); \
569 init_preds(&event_##call); \
570 return 0; \ 630 return 0; \
571} \ 631} \
572 \ 632 \
@@ -586,6 +646,110 @@ __attribute__((section("_ftrace_events"))) event_##call = { \
586 646
587#include TRACE_INCLUDE(TRACE_INCLUDE_FILE) 647#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
588 648
589#undef _TRACE_PROFILE 649/*
650 * Define the insertion callback to profile events
651 *
652 * The job is very similar to ftrace_raw_event_<call> except that we don't
653 * insert in the ring buffer but in a perf counter.
654 *
655 * static void ftrace_profile_<call>(proto)
656 * {
657 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
658 * struct ftrace_event_call *event_call = &event_<call>;
659 * extern void perf_tpcounter_event(int, u64, u64, void *, int);
660 * struct ftrace_raw_##call *entry;
661 * u64 __addr = 0, __count = 1;
662 * unsigned long irq_flags;
663 * int __entry_size;
664 * int __data_size;
665 * int pc;
666 *
667 * local_save_flags(irq_flags);
668 * pc = preempt_count();
669 *
670 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
671 *
672 * // Below we want to get the aligned size by taking into account
673 * // the u32 field that will later store the buffer size
674 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
675 * sizeof(u64));
676 * __entry_size -= sizeof(u32);
677 *
678 * do {
679 * char raw_data[__entry_size]; <- allocate our sample in the stack
680 * struct trace_entry *ent;
681 *
682 * zero dead bytes from alignment to avoid stack leak to userspace:
683 *
684 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
685 * entry = (struct ftrace_raw_<call> *)raw_data;
686 * ent = &entry->ent;
687 * tracing_generic_entry_update(ent, irq_flags, pc);
688 * ent->type = event_call->id;
689 *
690 * <tstruct> <- do some jobs with dynamic arrays
691 *
692 * <assign> <- affect our values
693 *
694 * perf_tpcounter_event(event_call->id, __addr, __count, entry,
695 * __entry_size); <- submit them to perf counter
696 * } while (0);
697 *
698 * }
699 */
700
701#ifdef CONFIG_EVENT_PROFILE
702
703#undef __perf_addr
704#define __perf_addr(a) __addr = (a)
705
706#undef __perf_count
707#define __perf_count(c) __count = (c)
708
709#undef TRACE_EVENT
710#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
711static void ftrace_profile_##call(proto) \
712{ \
713 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
714 struct ftrace_event_call *event_call = &event_##call; \
715 extern void perf_tpcounter_event(int, u64, u64, void *, int); \
716 struct ftrace_raw_##call *entry; \
717 u64 __addr = 0, __count = 1; \
718 unsigned long irq_flags; \
719 int __entry_size; \
720 int __data_size; \
721 int pc; \
722 \
723 local_save_flags(irq_flags); \
724 pc = preempt_count(); \
725 \
726 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
727 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
728 sizeof(u64)); \
729 __entry_size -= sizeof(u32); \
730 \
731 do { \
732 char raw_data[__entry_size]; \
733 struct trace_entry *ent; \
734 \
735 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
736 entry = (struct ftrace_raw_##call *)raw_data; \
737 ent = &entry->ent; \
738 tracing_generic_entry_update(ent, irq_flags, pc); \
739 ent->type = event_call->id; \
740 \
741 tstruct \
742 \
743 { assign; } \
744 \
745 perf_tpcounter_event(event_call->id, __addr, __count, entry,\
746 __entry_size); \
747 } while (0); \
748 \
749}
750
751#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
752#endif /* CONFIG_EVENT_PROFILE */
753
590#undef _TRACE_PROFILE_INIT 754#undef _TRACE_PROFILE_INIT
591 755
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-03 03:03:58 -0500