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tracing: Use seq_buf_used() in seq_buf_to_user() instead of len
[deliverable/linux.git] / include / trace / trace_events.h
CommitLineData
f42c85e7
SR		 1/*
2 * Stage 1 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
a7237765 6 * struct trace_event_raw_<call> {
f42c85e7
SR		 7 * struct trace_entry ent;
8 * <type> <item>;
9 * <type2> <item2>[<len>];
10 * [...]
11 * };
12 *
13 * The <type> <item> is created by the __field(type, item) macro or
14 * the __array(type2, item2, len) macro.
15 * We simply do "type item;", and that will create the fields
16 * in the structure.
17 */
18
af658dca 19#include <linux/trace_events.h>
f42c85e7 20
acd388fd
SRRH		 21#ifndef TRACE_SYSTEM_VAR
22#define TRACE_SYSTEM_VAR TRACE_SYSTEM
23#endif
24
25#define __app__(x, y) str__##x##y
26#define __app(x, y) __app__(x, y)
27
28#define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name)
29
30#define TRACE_MAKE_SYSTEM_STR() \
31 static const char TRACE_SYSTEM_STRING[] = \
32 __stringify(TRACE_SYSTEM)
33
34TRACE_MAKE_SYSTEM_STR();
35
0c564a53
SRRH		 36#undef TRACE_DEFINE_ENUM
37#define TRACE_DEFINE_ENUM(a) \
38 static struct trace_enum_map __used __initdata \
39 __##TRACE_SYSTEM##_##a = \
40 { \
41 .system = TRACE_SYSTEM_STRING, \
42 .enum_string = #a, \
43 .enum_value = a \
44 }; \
45 static struct trace_enum_map __used \
46 __attribute__((section("_ftrace_enum_map"))) \
47 *TRACE_SYSTEM##_##a = &__##TRACE_SYSTEM##_##a
48
ff038f5c 49/*
091ad365 50 * DECLARE_EVENT_CLASS can be used to add a generic function
ff038f5c
SR		 51 * handlers for events. That is, if all events have the same
52 * parameters and just have distinct trace points.
53 * Each tracepoint can be defined with DEFINE_EVENT and that
091ad365 54 * will map the DECLARE_EVENT_CLASS to the tracepoint.
ff038f5c
SR		 55 *
56 * TRACE_EVENT is a one to one mapping between tracepoint and template.
57 */
58#undef TRACE_EVENT
59#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
091ad365 60 DECLARE_EVENT_CLASS(name, \
ff038f5c
SR		 61 PARAMS(proto), \
62 PARAMS(args), \
63 PARAMS(tstruct), \
64 PARAMS(assign), \
65 PARAMS(print)); \
66 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
67
68
7fcb7c47
LZ		 69#undef __field
70#define __field(type, item) type item;
71
43b51ead
LZ		 72#undef __field_ext
73#define __field_ext(type, item, filter_type) type item;
74
4d4c9cc8
SR		 75#undef __field_struct
76#define __field_struct(type, item) type item;
77
78#undef __field_struct_ext
79#define __field_struct_ext(type, item, filter_type) type item;
80
f42c85e7
SR		 81#undef __array
82#define __array(type, item, len) type item[len];
83
7fcb7c47 84#undef __dynamic_array
7d536cb3 85#define __dynamic_array(type, item, len) u32 __data_loc_##item;
f42c85e7 86
9cbf1176 87#undef __string
7fcb7c47 88#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 89
4449bf92
SRRH		 90#undef __bitmask
91#define __bitmask(item, nr_bits) __dynamic_array(char, item, -1)
92
f42c85e7
SR		 93#undef TP_STRUCT__entry
94#define TP_STRUCT__entry(args...) args
95
091ad365
IM		 96#undef DECLARE_EVENT_CLASS
97#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
a7237765 98 struct trace_event_raw_##name { \
ff038f5c
SR		 99 struct trace_entry ent; \
100 tstruct \
101 char __data[0]; \
8f082018
SR		 102 }; \
103 \
2425bcb9 104 static struct trace_event_class event_class_##name;
8f082018 105
ff038f5c
SR		 106#undef DEFINE_EVENT
107#define DEFINE_EVENT(template, name, proto, args) \
2425bcb9 108 static struct trace_event_call __used \
86c38a31 109 __attribute__((__aligned__(4))) event_##name
f42c85e7 110
f5abaa1b
SR		 111#undef DEFINE_EVENT_FN
112#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
113 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
114
e5bc9721
SR		 115#undef DEFINE_EVENT_PRINT
116#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
117 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
118
97419875
JS		 119/* Callbacks are meaningless to ftrace. */
120#undef TRACE_EVENT_FN
0dd7b747
FW		 121#define TRACE_EVENT_FN(name, proto, args, tstruct, \
122 assign, print, reg, unreg) \
819ce45a
FW		 123 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
124 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
97419875 125
1ed0c597
FW		 126#undef TRACE_EVENT_FLAGS
127#define TRACE_EVENT_FLAGS(name, value) \
53cf810b 128 __TRACE_EVENT_FLAGS(name, value)
1ed0c597 129
d5b5f391
PZ		 130#undef TRACE_EVENT_PERF_PERM
131#define TRACE_EVENT_PERF_PERM(name, expr...) \
132 __TRACE_EVENT_PERF_PERM(name, expr)
133
f42c85e7
SR		 134#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
135
136/*
137 * Stage 2 of the trace events.
138 *
9cbf1176
FW		 139 * Include the following:
140 *
62323a14 141 * struct trace_event_data_offsets_<call> {
7d536cb3
LZ		 142 * u32 <item1>;
143 * u32 <item2>;
9cbf1176
FW		 144 * [...]
145 * };
146 *
7d536cb3 147 * The __dynamic_array() macro will create each u32 <item>, this is
7fcb7c47 148 * to keep the offset of each array from the beginning of the event.
7d536cb3 149 * The size of an array is also encoded, in the higher 16 bits of <item>.
9cbf1176
FW		 150 */
151
0c564a53
SRRH		 152#undef TRACE_DEFINE_ENUM
153#define TRACE_DEFINE_ENUM(a)
154
7fcb7c47 155#undef __field
43b51ead
LZ		 156#define __field(type, item)
157
158#undef __field_ext
159#define __field_ext(type, item, filter_type)
7fcb7c47 160
4d4c9cc8
SR		 161#undef __field_struct
162#define __field_struct(type, item)
163
164#undef __field_struct_ext
165#define __field_struct_ext(type, item, filter_type)
166
9cbf1176
FW		 167#undef __array
168#define __array(type, item, len)
169
7fcb7c47 170#undef __dynamic_array
7d536cb3 171#define __dynamic_array(type, item, len) u32 item;
9cbf1176
FW		 172
173#undef __string
7fcb7c47 174#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 175
4449bf92
SRRH		 176#undef __bitmask
177#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
178
091ad365
IM		 179#undef DECLARE_EVENT_CLASS
180#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
62323a14 181 struct trace_event_data_offsets_##call { \
9cbf1176
FW		 182 tstruct; \
183 };
184
ff038f5c
SR		 185#undef DEFINE_EVENT
186#define DEFINE_EVENT(template, name, proto, args)
187
e5bc9721
SR		 188#undef DEFINE_EVENT_PRINT
189#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
190 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
191
1ed0c597
FW		 192#undef TRACE_EVENT_FLAGS
193#define TRACE_EVENT_FLAGS(event, flag)
194
d5b5f391
PZ		 195#undef TRACE_EVENT_PERF_PERM
196#define TRACE_EVENT_PERF_PERM(event, expr...)
197
9cbf1176
FW		 198#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
199
200/*
201 * Stage 3 of the trace events.
202 *
f42c85e7
SR		 203 * Override the macros in <trace/trace_events.h> to include the following:
204 *
205 * enum print_line_t
892c505a 206 * trace_raw_output_<call>(struct trace_iterator *iter, int flags)
f42c85e7
SR		 207 * {
208 * struct trace_seq *s = &iter->seq;
a7237765 209 * struct trace_event_raw_<call> *field; <-- defined in stage 1
f42c85e7 210 * struct trace_entry *entry;
bc289ae9 211 * struct trace_seq *p = &iter->tmp_seq;
f42c85e7
SR		 212 * int ret;
213 *
214 * entry = iter->ent;
215 *
32c0edae 216 * if (entry->type != event_<call>->event.type) {
f42c85e7
SR		 217 * WARN_ON_ONCE(1);
218 * return TRACE_TYPE_UNHANDLED;
219 * }
220 *
221 * field = (typeof(field))entry;
222 *
56d8bd3f 223 * trace_seq_init(p);
50354a8a
LZ		 224 * ret = trace_seq_printf(s, "%s: ", <call>);
225 * if (ret)
226 * ret = trace_seq_printf(s, <TP_printk> "\n");
f42c85e7
SR		 227 * if (!ret)
228 * return TRACE_TYPE_PARTIAL_LINE;
229 *
230 * return TRACE_TYPE_HANDLED;
231 * }
232 *
233 * This is the method used to print the raw event to the trace
234 * output format. Note, this is not needed if the data is read
235 * in binary.
236 */
237
238#undef __entry
239#define __entry field
240
241#undef TP_printk
242#define TP_printk(fmt, args...) fmt "\n", args
243
7fcb7c47
LZ		 244#undef __get_dynamic_array
245#define __get_dynamic_array(field) \
7d536cb3 246 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
7fcb7c47 247
beba4bb0
SRRH		 248#undef __get_dynamic_array_len
249#define __get_dynamic_array_len(field) \
250 ((__entry->__data_loc_##field >> 16) & 0xffff)
251
9cbf1176 252#undef __get_str
7fcb7c47 253#define __get_str(field) (char *)__get_dynamic_array(field)
9cbf1176 254
4449bf92
SRRH		 255#undef __get_bitmask
256#define __get_bitmask(field) \
257 ({ \
258 void *__bitmask = __get_dynamic_array(field); \
259 unsigned int __bitmask_size; \
beba4bb0 260 __bitmask_size = __get_dynamic_array_len(field); \
645df987 261 trace_print_bitmask_seq(p, __bitmask, __bitmask_size); \
4449bf92
SRRH		 262 })
263
be74b73a
SR		 264#undef __print_flags
265#define __print_flags(flag, delim, flag_array...) \
266 ({ \
a48f494e 267 static const struct trace_print_flags __flags[] = \
be74b73a 268 { flag_array, { -1, NULL }}; \
645df987 269 trace_print_flags_seq(p, delim, flag, __flags); \
be74b73a
SR		 270 })
271
0f4fc29d
SR		 272#undef __print_symbolic
273#define __print_symbolic(value, symbol_array...) \
274 ({ \
275 static const struct trace_print_flags symbols[] = \
276 { symbol_array, { -1, NULL }}; \
645df987 277 trace_print_symbols_seq(p, value, symbols); \
0f4fc29d
SR		 278 })
279
2fc1b6f0 280#undef __print_symbolic_u64
281#if BITS_PER_LONG == 32
282#define __print_symbolic_u64(value, symbol_array...) \
283 ({ \
284 static const struct trace_print_flags_u64 symbols[] = \
285 { symbol_array, { -1, NULL } }; \
645df987 286 trace_print_symbols_seq_u64(p, value, symbols); \
2fc1b6f0 287 })
288#else
289#define __print_symbolic_u64(value, symbol_array...) \
290 __print_symbolic(value, symbol_array)
291#endif
292
5a2e3995 293#undef __print_hex
645df987 294#define __print_hex(buf, buf_len) trace_print_hex_seq(p, buf, buf_len)
5a2e3995 295
6ea22486
DM		 296#undef __print_array
297#define __print_array(array, count, el_size) \
298 ({ \
299 BUILD_BUG_ON(el_size != 1 && el_size != 2 && \
300 el_size != 4 && el_size != 8); \
645df987 301 trace_print_array_seq(p, array, count, el_size); \
6ea22486
DM		 302 })
303
091ad365
IM		 304#undef DECLARE_EVENT_CLASS
305#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 306static notrace enum print_line_t \
892c505a
SRRH		 307trace_raw_output_##call(struct trace_iterator *iter, int flags, \
308 struct trace_event *trace_event) \
f42c85e7
SR		 309{ \
310 struct trace_seq *s = &iter->seq; \
f71130de 311 struct trace_seq __maybe_unused *p = &iter->tmp_seq; \
a7237765 312 struct trace_event_raw_##call *field; \
f42c85e7
SR		 313 int ret; \
314 \
f71130de 315 field = (typeof(field))iter->ent; \
80decc70 316 \
892c505a 317 ret = trace_raw_output_prep(iter, trace_event); \
8e2e095c 318 if (ret != TRACE_TYPE_HANDLED) \
f71130de
LZ		 319 return ret; \
320 \
19a7fe20 321 trace_seq_printf(s, print); \
f42c85e7 322 \
19a7fe20 323 return trace_handle_return(s); \
80decc70 324} \
3ad017ba 325static struct trace_event_functions trace_event_type_funcs_##call = { \
892c505a 326 .trace = trace_raw_output_##call, \
80decc70 327};
ff038f5c 328
e5bc9721
SR		 329#undef DEFINE_EVENT_PRINT
330#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
83f0d539 331static notrace enum print_line_t \
892c505a 332trace_raw_output_##call(struct trace_iterator *iter, int flags, \
a9a57763 333 struct trace_event *event) \
e5bc9721 334{ \
a7237765 335 struct trace_event_raw_##template *field; \
e5bc9721 336 struct trace_entry *entry; \
bc289ae9 337 struct trace_seq *p = &iter->tmp_seq; \
f42c85e7
SR		 338 \
339 entry = iter->ent; \
340 \
32c0edae 341 if (entry->type != event_##call.event.type) { \
f42c85e7
SR		 342 WARN_ON_ONCE(1); \
343 return TRACE_TYPE_UNHANDLED; \
344 } \
345 \
346 field = (typeof(field))entry; \
347 \
56d8bd3f 348 trace_seq_init(p); \
892c505a 349 return trace_output_call(iter, #call, print); \
80decc70 350} \
3ad017ba 351static struct trace_event_functions trace_event_type_funcs_##call = { \
892c505a 352 .trace = trace_raw_output_##call, \
80decc70 353};
e5bc9721 354
f42c85e7
SR		 355#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
356
43b51ead
LZ		 357#undef __field_ext
358#define __field_ext(type, item, filter_type) \
f42c85e7
SR		 359 ret = trace_define_field(event_call, #type, #item, \
360 offsetof(typeof(field), item), \
43b51ead
LZ		 361 sizeof(field.item), \
362 is_signed_type(type), filter_type); \
f42c85e7
SR		 363 if (ret) \
364 return ret;
365
4d4c9cc8
SR		 366#undef __field_struct_ext
367#define __field_struct_ext(type, item, filter_type) \
368 ret = trace_define_field(event_call, #type, #item, \
369 offsetof(typeof(field), item), \
370 sizeof(field.item), \
371 0, filter_type); \
372 if (ret) \
373 return ret;
374
43b51ead
LZ		 375#undef __field
376#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
377
4d4c9cc8
SR		 378#undef __field_struct
379#define __field_struct(type, item) __field_struct_ext(type, item, FILTER_OTHER)
380
f42c85e7
SR		 381#undef __array
382#define __array(type, item, len) \
04295780 383 do { \
87291347 384 char *type_str = #type"["__stringify(len)"]"; \
04295780 385 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
87291347 386 ret = trace_define_field(event_call, type_str, #item, \
f42c85e7 387 offsetof(typeof(field), item), \
fb7ae981
LJ		 388 sizeof(field.item), \
389 is_signed_type(type), FILTER_OTHER); \
04295780
SR		 390 if (ret) \
391 return ret; \
392 } while (0);
f42c85e7 393
7fcb7c47
LZ		 394#undef __dynamic_array
395#define __dynamic_array(type, item, len) \
68fd60a8 396 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
43b51ead 397 offsetof(typeof(field), __data_loc_##item), \
fb7ae981
LJ		 398 sizeof(field.__data_loc_##item), \
399 is_signed_type(type), FILTER_OTHER);
7fcb7c47 400
9cbf1176 401#undef __string
7fcb7c47 402#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 403
4449bf92
SRRH		 404#undef __bitmask
405#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
406
091ad365
IM		 407#undef DECLARE_EVENT_CLASS
408#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
7e4f44b1 409static int notrace __init \
33d0f35e 410trace_event_define_fields_##call(struct trace_event_call *event_call) \
f42c85e7 411{ \
a7237765 412 struct trace_event_raw_##call field; \
f42c85e7
SR		 413 int ret; \
414 \
f42c85e7
SR		 415 tstruct; \
416 \
417 return ret; \
418}
419
ff038f5c
SR		 420#undef DEFINE_EVENT
421#define DEFINE_EVENT(template, name, proto, args)
422
e5bc9721
SR		 423#undef DEFINE_EVENT_PRINT
424#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
425 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
426
f42c85e7
SR		 427#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
428
7fcb7c47
LZ		 429/*
430 * remember the offset of each array from the beginning of the event.
431 */
432
433#undef __entry
434#define __entry entry
435
436#undef __field
437#define __field(type, item)
438
43b51ead
LZ		 439#undef __field_ext
440#define __field_ext(type, item, filter_type)
441
4d4c9cc8
SR		 442#undef __field_struct
443#define __field_struct(type, item)
444
445#undef __field_struct_ext
446#define __field_struct_ext(type, item, filter_type)
447
7fcb7c47
LZ		 448#undef __array
449#define __array(type, item, len)
450
451#undef __dynamic_array
452#define __dynamic_array(type, item, len) \
114e7b52 453 __item_length = (len) * sizeof(type); \
7fcb7c47
LZ		 454 __data_offsets->item = __data_size + \
455 offsetof(typeof(*entry), __data); \
114e7b52
FB		 456 __data_offsets->item |= __item_length << 16; \
457 __data_size += __item_length;
7fcb7c47
LZ		 458
459#undef __string
4e58e547
SRRH		 460#define __string(item, src) __dynamic_array(char, item, \
461 strlen((src) ? (const char *)(src) : "(null)") + 1)
7fcb7c47 462
4449bf92
SRRH		 463/*
464 * __bitmask_size_in_bytes_raw is the number of bytes needed to hold
465 * num_possible_cpus().
466 */
467#define __bitmask_size_in_bytes_raw(nr_bits) \
468 (((nr_bits) + 7) / 8)
469
470#define __bitmask_size_in_longs(nr_bits) \
471 ((__bitmask_size_in_bytes_raw(nr_bits) + \
472 ((BITS_PER_LONG / 8) - 1)) / (BITS_PER_LONG / 8))
473
474/*
475 * __bitmask_size_in_bytes is the number of bytes needed to hold
476 * num_possible_cpus() padded out to the nearest long. This is what
477 * is saved in the buffer, just to be consistent.
478 */
479#define __bitmask_size_in_bytes(nr_bits) \
480 (__bitmask_size_in_longs(nr_bits) * (BITS_PER_LONG / 8))
481
482#undef __bitmask
483#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, \
484 __bitmask_size_in_longs(nr_bits))
485
091ad365
IM		 486#undef DECLARE_EVENT_CLASS
487#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
d0ee8f4a 488static inline notrace int trace_event_get_offsets_##call( \
62323a14 489 struct trace_event_data_offsets_##call *__data_offsets, proto) \
7fcb7c47
LZ		 490{ \
491 int __data_size = 0; \
114e7b52 492 int __maybe_unused __item_length; \
a7237765 493 struct trace_event_raw_##call __maybe_unused *entry; \
7fcb7c47
LZ		 494 \
495 tstruct; \
496 \
497 return __data_size; \
498}
499
ff038f5c
SR		 500#undef DEFINE_EVENT
501#define DEFINE_EVENT(template, name, proto, args)
502
e5bc9721
SR		 503#undef DEFINE_EVENT_PRINT
504#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
505 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
506
7fcb7c47
LZ		 507#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
508
46ac5182
SRRH		 509/*
510 * Stage 4 of the trace events.
511 *
512 * Override the macros in <trace/trace_events.h> to include the following:
513 *
514 * For those macros defined with TRACE_EVENT:
515 *
516 * static struct trace_event_call event_<call>;
517 *
518 * static void trace_event_raw_event_<call>(void *__data, proto)
519 * {
520 * struct trace_event_file *trace_file = __data;
521 * struct trace_event_call *event_call = trace_file->event_call;
522 * struct trace_event_data_offsets_<call> __maybe_unused __data_offsets;
523 * unsigned long eflags = trace_file->flags;
524 * enum event_trigger_type __tt = ETT_NONE;
525 * struct ring_buffer_event *event;
526 * struct trace_event_raw_<call> *entry; <-- defined in stage 1
527 * struct ring_buffer *buffer;
528 * unsigned long irq_flags;
529 * int __data_size;
530 * int pc;
531 *
532 * if (!(eflags & EVENT_FILE_FL_TRIGGER_COND)) {
533 * if (eflags & EVENT_FILE_FL_TRIGGER_MODE)
534 * event_triggers_call(trace_file, NULL);
535 * if (eflags & EVENT_FILE_FL_SOFT_DISABLED)
536 * return;
537 * }
538 *
539 * local_save_flags(irq_flags);
540 * pc = preempt_count();
541 *
542 * __data_size = trace_event_get_offsets_<call>(&__data_offsets, args);
543 *
544 * event = trace_event_buffer_lock_reserve(&buffer, trace_file,
545 * event_<call>->event.type,
546 * sizeof(*entry) + __data_size,
547 * irq_flags, pc);
548 * if (!event)
549 * return;
550 * entry = ring_buffer_event_data(event);
551 *
552 * { <assign>; } <-- Here we assign the entries by the __field and
553 * __array macros.
554 *
555 * if (eflags & EVENT_FILE_FL_TRIGGER_COND)
556 * __tt = event_triggers_call(trace_file, entry);
557 *
558 * if (test_bit(EVENT_FILE_FL_SOFT_DISABLED_BIT,
559 * &trace_file->flags))
560 * ring_buffer_discard_commit(buffer, event);
561 * else if (!filter_check_discard(trace_file, entry, buffer, event))
562 * trace_buffer_unlock_commit(buffer, event, irq_flags, pc);
563 *
564 * if (__tt)
565 * event_triggers_post_call(trace_file, __tt);
566 * }
567 *
568 * static struct trace_event ftrace_event_type_<call> = {
569 * .trace = trace_raw_output_<call>, <-- stage 2
570 * };
571 *
572 * static char print_fmt_<call>[] = <TP_printk>;
573 *
574 * static struct trace_event_class __used event_class_<template> = {
575 * .system = "<system>",
576 * .define_fields = trace_event_define_fields_<call>,
577 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
578 * .raw_init = trace_event_raw_init,
579 * .probe = trace_event_raw_event_##call,
580 * .reg = trace_event_reg,
581 * };
582 *
583 * static struct trace_event_call event_<call> = {
584 * .class = event_class_<template>,
585 * {
586 * .tp = &__tracepoint_<call>,
587 * },
588 * .event = &ftrace_event_type_<call>,
589 * .print_fmt = print_fmt_<call>,
590 * .flags = TRACE_EVENT_FL_TRACEPOINT,
591 * };
592 * // its only safe to use pointers when doing linker tricks to
593 * // create an array.
594 * static struct trace_event_call __used
595 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
596 *
597 */
598
599#ifdef CONFIG_PERF_EVENTS
600
601#define _TRACE_PERF_PROTO(call, proto) \
602 static notrace void \
603 perf_trace_##call(void *__data, proto);
604
605#define _TRACE_PERF_INIT(call) \
606 .perf_probe = perf_trace_##call,
607
608#else
609#define _TRACE_PERF_PROTO(call, proto)
610#define _TRACE_PERF_INIT(call)
611#endif /* CONFIG_PERF_EVENTS */
612
613#undef __entry
614#define __entry entry
615
616#undef __field
617#define __field(type, item)
618
619#undef __field_struct
620#define __field_struct(type, item)
621
622#undef __array
623#define __array(type, item, len)
624
625#undef __dynamic_array
626#define __dynamic_array(type, item, len) \
627 __entry->__data_loc_##item = __data_offsets.item;
628
629#undef __string
630#define __string(item, src) __dynamic_array(char, item, -1)
631
632#undef __assign_str
633#define __assign_str(dst, src) \
634 strcpy(__get_str(dst), (src) ? (const char *)(src) : "(null)");
635
636#undef __bitmask
637#define __bitmask(item, nr_bits) __dynamic_array(unsigned long, item, -1)
638
639#undef __get_bitmask
640#define __get_bitmask(field) (char *)__get_dynamic_array(field)
641
642#undef __assign_bitmask
643#define __assign_bitmask(dst, src, nr_bits) \
644 memcpy(__get_bitmask(dst), (src), __bitmask_size_in_bytes(nr_bits))
645
646#undef TP_fast_assign
647#define TP_fast_assign(args...) args
648
649#undef __perf_addr
650#define __perf_addr(a) (a)
651
652#undef __perf_count
653#define __perf_count(c) (c)
654
655#undef __perf_task
656#define __perf_task(t) (t)
657
658#undef DECLARE_EVENT_CLASS
659#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
660 \
661static notrace void \
662trace_event_raw_event_##call(void *__data, proto) \
663{ \
664 struct trace_event_file *trace_file = __data; \
665 struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
666 struct trace_event_buffer fbuffer; \
667 struct trace_event_raw_##call *entry; \
668 int __data_size; \
669 \
670 if (trace_trigger_soft_disabled(trace_file)) \
671 return; \
672 \
673 __data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
674 \
675 entry = trace_event_buffer_reserve(&fbuffer, trace_file, \
676 sizeof(*entry) + __data_size); \
677 \
678 if (!entry) \
679 return; \
680 \
681 tstruct \
682 \
683 { assign; } \
684 \
685 trace_event_buffer_commit(&fbuffer); \
686}
687/*
688 * The ftrace_test_probe is compiled out, it is only here as a build time check
689 * to make sure that if the tracepoint handling changes, the ftrace probe will
690 * fail to compile unless it too is updated.
691 */
692
693#undef DEFINE_EVENT
694#define DEFINE_EVENT(template, call, proto, args) \
695static inline void ftrace_test_probe_##call(void) \
696{ \
697 check_trace_callback_type_##call(trace_event_raw_event_##template); \
698}
699
700#undef DEFINE_EVENT_PRINT
701#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
702
703#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
704
705#undef __entry
706#define __entry REC
707
708#undef __print_flags
709#undef __print_symbolic
710#undef __print_hex
711#undef __get_dynamic_array
712#undef __get_dynamic_array_len
713#undef __get_str
714#undef __get_bitmask
715#undef __print_array
716
717#undef TP_printk
718#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
719
720#undef DECLARE_EVENT_CLASS
721#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
722_TRACE_PERF_PROTO(call, PARAMS(proto)); \
723static char print_fmt_##call[] = print; \
724static struct trace_event_class __used __refdata event_class_##call = { \
725 .system = TRACE_SYSTEM_STRING, \
726 .define_fields = trace_event_define_fields_##call, \
727 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
728 .raw_init = trace_event_raw_init, \
729 .probe = trace_event_raw_event_##call, \
730 .reg = trace_event_reg, \
731 _TRACE_PERF_INIT(call) \
732};
733
734#undef DEFINE_EVENT
735#define DEFINE_EVENT(template, call, proto, args) \
736 \
737static struct trace_event_call __used event_##call = { \
738 .class = &event_class_##template, \
739 { \
740 .tp = &__tracepoint_##call, \
741 }, \
742 .event.funcs = &trace_event_type_funcs_##template, \
743 .print_fmt = print_fmt_##template, \
744 .flags = TRACE_EVENT_FL_TRACEPOINT, \
745}; \
746static struct trace_event_call __used \
747__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
748
749#undef DEFINE_EVENT_PRINT
750#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
751 \
752static char print_fmt_##call[] = print; \
753 \
754static struct trace_event_call __used event_##call = { \
755 .class = &event_class_##template, \
756 { \
757 .tp = &__tracepoint_##call, \
758 }, \
759 .event.funcs = &trace_event_type_funcs_##call, \
760 .print_fmt = print_fmt_##call, \
761 .flags = TRACE_EVENT_FL_TRACEPOINT, \
762}; \
763static struct trace_event_call __used \
764__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
765
766#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
Linux kernel - Deliverables
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