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1/*
2 * Stage 1 of the trace events.
3 *
4 * Override the macros in <trace/trace_events.h> to include the following:
5 *
6 * struct ftrace_raw_<call> {
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
19#include <linux/ftrace_event.h>
20
ff038f5c 21/*
091ad365 22 * DECLARE_EVENT_CLASS can be used to add a generic function
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23 * handlers for events. That is, if all events have the same
24 * parameters and just have distinct trace points.
25 * Each tracepoint can be defined with DEFINE_EVENT and that
091ad365 26 * will map the DECLARE_EVENT_CLASS to the tracepoint.
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27 *
28 * TRACE_EVENT is a one to one mapping between tracepoint and template.
29 */
30#undef TRACE_EVENT
31#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
091ad365 32 DECLARE_EVENT_CLASS(name, \
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33 PARAMS(proto), \
34 PARAMS(args), \
35 PARAMS(tstruct), \
36 PARAMS(assign), \
37 PARAMS(print)); \
38 DEFINE_EVENT(name, name, PARAMS(proto), PARAMS(args));
39
40
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41#undef __field
42#define __field(type, item) type item;
43
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44#undef __field_ext
45#define __field_ext(type, item, filter_type) type item;
46
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47#undef __array
48#define __array(type, item, len) type item[len];
49
7fcb7c47 50#undef __dynamic_array
7d536cb3 51#define __dynamic_array(type, item, len) u32 __data_loc_##item;
f42c85e7 52
9cbf1176 53#undef __string
7fcb7c47 54#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 55
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56#undef TP_STRUCT__entry
57#define TP_STRUCT__entry(args...) args
58
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59#undef DECLARE_EVENT_CLASS
60#define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) \
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61 struct ftrace_raw_##name { \
62 struct trace_entry ent; \
63 tstruct \
64 char __data[0]; \
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65 }; \
66 \
67 static struct ftrace_event_class event_class_##name;
68
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69#undef DEFINE_EVENT
70#define DEFINE_EVENT(template, name, proto, args) \
49c17746 71 static struct ftrace_event_call __used \
86c38a31 72 __attribute__((__aligned__(4))) event_##name
f42c85e7 73
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74#undef DEFINE_EVENT_PRINT
75#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
76 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
77
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78/* Callbacks are meaningless to ftrace. */
79#undef TRACE_EVENT_FN
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80#define TRACE_EVENT_FN(name, proto, args, tstruct, \
81 assign, print, reg, unreg) \
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82 TRACE_EVENT(name, PARAMS(proto), PARAMS(args), \
83 PARAMS(tstruct), PARAMS(assign), PARAMS(print)) \
97419875 84
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85#undef TRACE_EVENT_FLAGS
86#define TRACE_EVENT_FLAGS(name, value) \
53cf810b 87 __TRACE_EVENT_FLAGS(name, value)
1ed0c597 88
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89#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
90
9cbf1176 91
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92/*
93 * Stage 2 of the trace events.
94 *
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95 * Include the following:
96 *
7fcb7c47 97 * struct ftrace_data_offsets_<call> {
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98 * u32 <item1>;
99 * u32 <item2>;
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100 * [...]
101 * };
102 *
7d536cb3 103 * The __dynamic_array() macro will create each u32 <item>, this is
7fcb7c47 104 * to keep the offset of each array from the beginning of the event.
7d536cb3 105 * The size of an array is also encoded, in the higher 16 bits of <item>.
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106 */
107
7fcb7c47 108#undef __field
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109#define __field(type, item)
110
111#undef __field_ext
112#define __field_ext(type, item, filter_type)
7fcb7c47 113
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114#undef __array
115#define __array(type, item, len)
116
7fcb7c47 117#undef __dynamic_array
7d536cb3 118#define __dynamic_array(type, item, len) u32 item;
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119
120#undef __string
7fcb7c47 121#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 122
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123#undef DECLARE_EVENT_CLASS
124#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
7fcb7c47 125 struct ftrace_data_offsets_##call { \
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126 tstruct; \
127 };
128
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129#undef DEFINE_EVENT
130#define DEFINE_EVENT(template, name, proto, args)
131
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132#undef DEFINE_EVENT_PRINT
133#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
134 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
135
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136#undef TRACE_EVENT_FLAGS
137#define TRACE_EVENT_FLAGS(event, flag)
138
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139#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
140
141/*
142 * Stage 3 of the trace events.
143 *
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144 * Override the macros in <trace/trace_events.h> to include the following:
145 *
146 * enum print_line_t
147 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
148 * {
149 * struct trace_seq *s = &iter->seq;
150 * struct ftrace_raw_<call> *field; <-- defined in stage 1
151 * struct trace_entry *entry;
bc289ae9 152 * struct trace_seq *p = &iter->tmp_seq;
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153 * int ret;
154 *
155 * entry = iter->ent;
156 *
32c0edae 157 * if (entry->type != event_<call>->event.type) {
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158 * WARN_ON_ONCE(1);
159 * return TRACE_TYPE_UNHANDLED;
160 * }
161 *
162 * field = (typeof(field))entry;
163 *
56d8bd3f 164 * trace_seq_init(p);
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165 * ret = trace_seq_printf(s, "%s: ", <call>);
166 * if (ret)
167 * ret = trace_seq_printf(s, <TP_printk> "\n");
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168 * if (!ret)
169 * return TRACE_TYPE_PARTIAL_LINE;
170 *
171 * return TRACE_TYPE_HANDLED;
172 * }
173 *
174 * This is the method used to print the raw event to the trace
175 * output format. Note, this is not needed if the data is read
176 * in binary.
177 */
178
179#undef __entry
180#define __entry field
181
182#undef TP_printk
183#define TP_printk(fmt, args...) fmt "\n", args
184
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185#undef __get_dynamic_array
186#define __get_dynamic_array(field) \
7d536cb3 187 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
7fcb7c47 188
9cbf1176 189#undef __get_str
7fcb7c47 190#define __get_str(field) (char *)__get_dynamic_array(field)
9cbf1176 191
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192#undef __print_flags
193#define __print_flags(flag, delim, flag_array...) \
194 ({ \
a48f494e 195 static const struct trace_print_flags __flags[] = \
be74b73a 196 { flag_array, { -1, NULL }}; \
a48f494e 197 ftrace_print_flags_seq(p, delim, flag, __flags); \
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198 })
199
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200#undef __print_symbolic
201#define __print_symbolic(value, symbol_array...) \
202 ({ \
203 static const struct trace_print_flags symbols[] = \
204 { symbol_array, { -1, NULL }}; \
205 ftrace_print_symbols_seq(p, value, symbols); \
206 })
207
2fc1b6f0 208#undef __print_symbolic_u64
209#if BITS_PER_LONG == 32
210#define __print_symbolic_u64(value, symbol_array...) \
211 ({ \
212 static const struct trace_print_flags_u64 symbols[] = \
213 { symbol_array, { -1, NULL } }; \
214 ftrace_print_symbols_seq_u64(p, value, symbols); \
215 })
216#else
217#define __print_symbolic_u64(value, symbol_array...) \
218 __print_symbolic(value, symbol_array)
219#endif
220
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221#undef __print_hex
222#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
223
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224#undef DECLARE_EVENT_CLASS
225#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 226static notrace enum print_line_t \
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227ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
228 struct trace_event *trace_event) \
f42c85e7 229{ \
80decc70 230 struct ftrace_event_call *event; \
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231 struct trace_seq *s = &iter->seq; \
232 struct ftrace_raw_##call *field; \
233 struct trace_entry *entry; \
bc289ae9 234 struct trace_seq *p = &iter->tmp_seq; \
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235 int ret; \
236 \
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237 event = container_of(trace_event, struct ftrace_event_call, \
238 event); \
239 \
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240 entry = iter->ent; \
241 \
32c0edae 242 if (entry->type != event->event.type) { \
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243 WARN_ON_ONCE(1); \
244 return TRACE_TYPE_UNHANDLED; \
245 } \
246 \
247 field = (typeof(field))entry; \
248 \
56d8bd3f 249 trace_seq_init(p); \
80decc70 250 ret = trace_seq_printf(s, "%s: ", event->name); \
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251 if (ret) \
252 ret = trace_seq_printf(s, print); \
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253 if (!ret) \
254 return TRACE_TYPE_PARTIAL_LINE; \
255 \
256 return TRACE_TYPE_HANDLED; \
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257} \
258static struct trace_event_functions ftrace_event_type_funcs_##call = { \
259 .trace = ftrace_raw_output_##call, \
260};
ff038f5c 261
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262#undef DEFINE_EVENT_PRINT
263#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
83f0d539 264static notrace enum print_line_t \
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265ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
266 struct trace_event *event) \
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267{ \
268 struct trace_seq *s = &iter->seq; \
269 struct ftrace_raw_##template *field; \
270 struct trace_entry *entry; \
bc289ae9 271 struct trace_seq *p = &iter->tmp_seq; \
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272 int ret; \
273 \
274 entry = iter->ent; \
275 \
32c0edae 276 if (entry->type != event_##call.event.type) { \
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277 WARN_ON_ONCE(1); \
278 return TRACE_TYPE_UNHANDLED; \
279 } \
280 \
281 field = (typeof(field))entry; \
282 \
56d8bd3f 283 trace_seq_init(p); \
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284 ret = trace_seq_printf(s, "%s: ", #call); \
285 if (ret) \
286 ret = trace_seq_printf(s, print); \
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287 if (!ret) \
288 return TRACE_TYPE_PARTIAL_LINE; \
289 \
290 return TRACE_TYPE_HANDLED; \
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291} \
292static struct trace_event_functions ftrace_event_type_funcs_##call = { \
293 .trace = ftrace_raw_output_##call, \
294};
e5bc9721 295
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296#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
297
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298#undef __field_ext
299#define __field_ext(type, item, filter_type) \
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300 ret = trace_define_field(event_call, #type, #item, \
301 offsetof(typeof(field), item), \
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302 sizeof(field.item), \
303 is_signed_type(type), filter_type); \
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304 if (ret) \
305 return ret;
306
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307#undef __field
308#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
309
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310#undef __array
311#define __array(type, item, len) \
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312 do { \
313 mutex_lock(&event_storage_mutex); \
314 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
315 snprintf(event_storage, sizeof(event_storage), \
316 "%s[%d]", #type, len); \
317 ret = trace_define_field(event_call, event_storage, #item, \
f42c85e7 318 offsetof(typeof(field), item), \
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319 sizeof(field.item), \
320 is_signed_type(type), FILTER_OTHER); \
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321 mutex_unlock(&event_storage_mutex); \
322 if (ret) \
323 return ret; \
324 } while (0);
f42c85e7 325
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326#undef __dynamic_array
327#define __dynamic_array(type, item, len) \
68fd60a8 328 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
43b51ead 329 offsetof(typeof(field), __data_loc_##item), \
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330 sizeof(field.__data_loc_##item), \
331 is_signed_type(type), FILTER_OTHER);
7fcb7c47 332
9cbf1176 333#undef __string
7fcb7c47 334#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 335
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336#undef DECLARE_EVENT_CLASS
337#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
83f0d539 338static int notrace \
14be96c9 339ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
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340{ \
341 struct ftrace_raw_##call field; \
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342 int ret; \
343 \
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344 tstruct; \
345 \
346 return ret; \
347}
348
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349#undef DEFINE_EVENT
350#define DEFINE_EVENT(template, name, proto, args)
351
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352#undef DEFINE_EVENT_PRINT
353#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
354 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
355
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356#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
357
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358/*
359 * remember the offset of each array from the beginning of the event.
360 */
361
362#undef __entry
363#define __entry entry
364
365#undef __field
366#define __field(type, item)
367
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368#undef __field_ext
369#define __field_ext(type, item, filter_type)
370
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371#undef __array
372#define __array(type, item, len)
373
374#undef __dynamic_array
375#define __dynamic_array(type, item, len) \
376 __data_offsets->item = __data_size + \
377 offsetof(typeof(*entry), __data); \
7d536cb3 378 __data_offsets->item |= (len * sizeof(type)) << 16; \
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379 __data_size += (len) * sizeof(type);
380
381#undef __string
ff038f5c 382#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
7fcb7c47 383
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384#undef DECLARE_EVENT_CLASS
385#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 386static inline notrace int ftrace_get_offsets_##call( \
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387 struct ftrace_data_offsets_##call *__data_offsets, proto) \
388{ \
389 int __data_size = 0; \
390 struct ftrace_raw_##call __maybe_unused *entry; \
391 \
392 tstruct; \
393 \
394 return __data_size; \
395}
396
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397#undef DEFINE_EVENT
398#define DEFINE_EVENT(template, name, proto, args)
399
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400#undef DEFINE_EVENT_PRINT
401#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
402 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
403
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404#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
405
c32e827b 406/*
9cbf1176 407 * Stage 4 of the trace events.
c32e827b 408 *
ea20d929 409 * Override the macros in <trace/trace_events.h> to include the following:
c32e827b 410 *
157587d7 411 * For those macros defined with TRACE_EVENT:
c32e827b
SR
412 *
413 * static struct ftrace_event_call event_<call>;
414 *
2239291a 415 * static void ftrace_raw_event_<call>(void *__data, proto)
c32e827b 416 * {
2239291a 417 * struct ftrace_event_call *event_call = __data;
50354a8a 418 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
ef18012b
SR
419 * struct ring_buffer_event *event;
420 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
e77405ad 421 * struct ring_buffer *buffer;
ef18012b 422 * unsigned long irq_flags;
50354a8a 423 * int __data_size;
ef18012b
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424 * int pc;
425 *
426 * local_save_flags(irq_flags);
427 * pc = preempt_count();
428 *
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429 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
430 *
e77405ad 431 * event = trace_current_buffer_lock_reserve(&buffer,
32c0edae 432 * event_<call>->event.type,
50354a8a 433 * sizeof(*entry) + __data_size,
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434 * irq_flags, pc);
435 * if (!event)
436 * return;
437 * entry = ring_buffer_event_data(event);
438 *
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439 * { <assign>; } <-- Here we assign the entries by the __field and
440 * __array macros.
c32e827b 441 *
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442 * if (!filter_current_check_discard(buffer, event_call, entry, event))
443 * trace_current_buffer_unlock_commit(buffer,
444 * event, irq_flags, pc);
c32e827b
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445 * }
446 *
c32e827b 447 * static struct trace_event ftrace_event_type_<call> = {
ef18012b 448 * .trace = ftrace_raw_output_<call>, <-- stage 2
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449 * };
450 *
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451 * static const char print_fmt_<call>[] = <TP_printk>;
452 *
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453 * static struct ftrace_event_class __used event_class_<template> = {
454 * .system = "<system>",
2e33af02 455 * .define_fields = ftrace_define_fields_<call>,
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456 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
457 * .raw_init = trace_event_raw_init,
458 * .probe = ftrace_raw_event_##call,
a1d0ce82 459 * .reg = ftrace_event_reg,
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460 * };
461 *
e4a9ea5e 462 * static struct ftrace_event_call event_<call> = {
ef18012b 463 * .name = "<call>",
8f082018 464 * .class = event_class_<template>,
2e33af02 465 * .event = &ftrace_event_type_<call>,
50354a8a 466 * .print_fmt = print_fmt_<call>,
8f082018 467 * };
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468 * // its only safe to use pointers when doing linker tricks to
469 * // create an array.
470 * static struct ftrace_event_call __used
471 * __attribute__((section("_ftrace_events"))) *__event_<call> = &event_<call>;
c32e827b
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472 *
473 */
474
07b139c8 475#ifdef CONFIG_PERF_EVENTS
ac199db0 476
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477#define _TRACE_PERF_PROTO(call, proto) \
478 static notrace void \
479 perf_trace_##call(void *__data, proto);
480
97d5a220 481#define _TRACE_PERF_INIT(call) \
2239291a 482 .perf_probe = perf_trace_##call,
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483
484#else
2239291a 485#define _TRACE_PERF_PROTO(call, proto)
97d5a220 486#define _TRACE_PERF_INIT(call)
07b139c8 487#endif /* CONFIG_PERF_EVENTS */
ac199db0 488
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489#undef __entry
490#define __entry entry
d20e3b03 491
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492#undef __field
493#define __field(type, item)
494
495#undef __array
496#define __array(type, item, len)
497
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498#undef __dynamic_array
499#define __dynamic_array(type, item, len) \
500 __entry->__data_loc_##item = __data_offsets.item;
501
9cbf1176 502#undef __string
7fcb7c47 503#define __string(item, src) __dynamic_array(char, item, -1) \
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504
505#undef __assign_str
506#define __assign_str(dst, src) \
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507 strcpy(__get_str(dst), src);
508
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509#undef TP_fast_assign
510#define TP_fast_assign(args...) args
511
512#undef TP_perf_assign
513#define TP_perf_assign(args...)
514
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515#undef DECLARE_EVENT_CLASS
516#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
c32e827b 517 \
83f0d539 518static notrace void \
2239291a 519ftrace_raw_event_##call(void *__data, proto) \
c32e827b 520{ \
2239291a 521 struct ftrace_event_call *event_call = __data; \
7fcb7c47 522 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
c32e827b
SR
523 struct ring_buffer_event *event; \
524 struct ftrace_raw_##call *entry; \
e77405ad 525 struct ring_buffer *buffer; \
c32e827b 526 unsigned long irq_flags; \
7fcb7c47 527 int __data_size; \
c32e827b
SR
528 int pc; \
529 \
530 local_save_flags(irq_flags); \
531 pc = preempt_count(); \
532 \
7fcb7c47 533 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
9cbf1176 534 \
e77405ad 535 event = trace_current_buffer_lock_reserve(&buffer, \
32c0edae 536 event_call->event.type, \
7fcb7c47 537 sizeof(*entry) + __data_size, \
9cbf1176 538 irq_flags, pc); \
c32e827b
SR
539 if (!event) \
540 return; \
541 entry = ring_buffer_event_data(event); \
542 \
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543 tstruct \
544 \
a9c1c3ab 545 { assign; } \
c32e827b 546 \
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547 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
548 trace_nowake_buffer_unlock_commit(buffer, \
549 event, irq_flags, pc); \
ff038f5c 550}
2239291a
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551/*
552 * The ftrace_test_probe is compiled out, it is only here as a build time check
553 * to make sure that if the tracepoint handling changes, the ftrace probe will
554 * fail to compile unless it too is updated.
555 */
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556
557#undef DEFINE_EVENT
558#define DEFINE_EVENT(template, call, proto, args) \
2239291a 559static inline void ftrace_test_probe_##call(void) \
c32e827b 560{ \
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561 check_trace_callback_type_##call(ftrace_raw_event_##template); \
562}
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563
564#undef DEFINE_EVENT_PRINT
80decc70 565#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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566
567#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
568
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569#undef __entry
570#define __entry REC
571
572#undef __print_flags
573#undef __print_symbolic
b102f1d0 574#undef __print_hex
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575#undef __get_dynamic_array
576#undef __get_str
577
578#undef TP_printk
579#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
580
091ad365 581#undef DECLARE_EVENT_CLASS
509e760c 582#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
2239291a 583_TRACE_PERF_PROTO(call, PARAMS(proto)); \
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584static const char print_fmt_##call[] = print; \
585static struct ftrace_event_class __used event_class_##call = { \
2239291a 586 .system = __stringify(TRACE_SYSTEM), \
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587 .define_fields = ftrace_define_fields_##call, \
588 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
0405ab80 589 .raw_init = trace_event_raw_init, \
2239291a 590 .probe = ftrace_raw_event_##call, \
a1d0ce82 591 .reg = ftrace_event_reg, \
2239291a 592 _TRACE_PERF_INIT(call) \
8f082018 593};
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594
595#undef DEFINE_EVENT
596#define DEFINE_EVENT(template, call, proto, args) \
c32e827b 597 \
e4a9ea5e 598static struct ftrace_event_call __used event_##call = { \
ef18012b 599 .name = #call, \
8f082018 600 .class = &event_class_##template, \
80decc70 601 .event.funcs = &ftrace_event_type_funcs_##template, \
509e760c 602 .print_fmt = print_fmt_##template, \
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603}; \
604static struct ftrace_event_call __used \
605__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
ac199db0 606
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607#undef DEFINE_EVENT_PRINT
608#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
c32e827b 609 \
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610static const char print_fmt_##call[] = print; \
611 \
e4a9ea5e 612static struct ftrace_event_call __used event_##call = { \
ef18012b 613 .name = #call, \
8f082018 614 .class = &event_class_##template, \
80decc70 615 .event.funcs = &ftrace_event_type_funcs_##call, \
509e760c 616 .print_fmt = print_fmt_##call, \
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617}; \
618static struct ftrace_event_call __used \
619__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
ac199db0 620
f42c85e7 621#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
ac199db0 622
f413cdb8 623/*
97d5a220 624 * Define the insertion callback to perf events
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625 *
626 * The job is very similar to ftrace_raw_event_<call> except that we don't
627 * insert in the ring buffer but in a perf counter.
628 *
97d5a220 629 * static void ftrace_perf_<call>(proto)
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630 * {
631 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
632 * struct ftrace_event_call *event_call = &event_<call>;
cdd6c482 633 * extern void perf_tp_event(int, u64, u64, void *, int);
f413cdb8 634 * struct ftrace_raw_##call *entry;
444a2a3b 635 * struct perf_trace_buf *trace_buf;
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636 * u64 __addr = 0, __count = 1;
637 * unsigned long irq_flags;
20ab4425 638 * struct trace_entry *ent;
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639 * int __entry_size;
640 * int __data_size;
20ab4425 641 * int __cpu
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642 * int pc;
643 *
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644 * pc = preempt_count();
645 *
646 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
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FW
647 *
648 * // Below we want to get the aligned size by taking into account
649 * // the u32 field that will later store the buffer size
650 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
651 * sizeof(u64));
652 * __entry_size -= sizeof(u32);
f413cdb8 653 *
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FW
654 * // Protect the non nmi buffer
655 * // This also protects the rcu read side
656 * local_irq_save(irq_flags);
657 * __cpu = smp_processor_id();
658 *
659 * if (in_nmi())
8d53dd54 660 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
20ab4425 661 * else
8d53dd54 662 * trace_buf = rcu_dereference_sched(perf_trace_buf);
20ab4425 663 *
444a2a3b 664 * if (!trace_buf)
20ab4425 665 * goto end;
f413cdb8 666 *
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FW
667 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
668 *
669 * // Avoid recursion from perf that could mess up the buffer
670 * if (trace_buf->recursion++)
671 * goto end_recursion;
672 *
673 * raw_data = trace_buf->buf;
674 *
675 * // Make recursion update visible before entering perf_tp_event
676 * // so that we protect from perf recursions.
677 *
678 * barrier();
1853db0e 679 *
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680 * //zero dead bytes from alignment to avoid stack leak to userspace:
681 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
682 * entry = (struct ftrace_raw_<call> *)raw_data;
683 * ent = &entry->ent;
684 * tracing_generic_entry_update(ent, irq_flags, pc);
685 * ent->type = event_call->id;
f413cdb8 686 *
20ab4425 687 * <tstruct> <- do some jobs with dynamic arrays
f413cdb8 688 *
20ab4425 689 * <assign> <- affect our values
f413cdb8 690 *
43c1266c 691 * perf_tp_event(event_call->id, __addr, __count, entry,
20ab4425 692 * __entry_size); <- submit them to perf counter
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693 *
694 * }
695 */
696
07b139c8 697#ifdef CONFIG_PERF_EVENTS
f413cdb8 698
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699#undef __entry
700#define __entry entry
701
702#undef __get_dynamic_array
703#define __get_dynamic_array(field) \
704 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
705
706#undef __get_str
707#define __get_str(field) (char *)__get_dynamic_array(field)
708
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709#undef __perf_addr
710#define __perf_addr(a) __addr = (a)
711
712#undef __perf_count
713#define __perf_count(c) __count = (c)
714
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715#undef TP_perf_assign
716#define TP_perf_assign(args...) args
717
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718#undef DECLARE_EVENT_CLASS
719#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 720static notrace void \
2239291a 721perf_trace_##call(void *__data, proto) \
f413cdb8 722{ \
2239291a 723 struct ftrace_event_call *event_call = __data; \
f413cdb8 724 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
f413cdb8 725 struct ftrace_raw_##call *entry; \
ff5f149b 726 struct pt_regs __regs; \
f413cdb8 727 u64 __addr = 0, __count = 1; \
1c024eca 728 struct hlist_head *head; \
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FW
729 int __entry_size; \
730 int __data_size; \
4ed7c92d 731 int rctx; \
f413cdb8 732 \
b0f82b81 733 perf_fetch_caller_regs(&__regs); \
f0218b3e 734 \
f413cdb8 735 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
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736 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
737 sizeof(u64)); \
304703ab 738 __entry_size -= sizeof(u32); \
f413cdb8 739 \
97d5a220 740 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
20ab4425
FW
741 "profile buffer not large enough")) \
742 return; \
b7e2ecef 743 \
97d5a220 744 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
ff5f149b 745 __entry_size, event_call->event.type, &__regs, &rctx); \
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746 if (!entry) \
747 return; \
b7e2ecef 748 \
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FW
749 tstruct \
750 \
751 { assign; } \
752 \
3771f077 753 head = this_cpu_ptr(event_call->perf_events); \
97d5a220 754 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
ff5f149b 755 __count, &__regs, head); \
f413cdb8
FW
756}
757
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758/*
759 * This part is compiled out, it is only here as a build time check
760 * to make sure that if the tracepoint handling changes, the
761 * perf probe will fail to compile unless it too is updated.
762 */
ff038f5c 763#undef DEFINE_EVENT
6cc8a7c1 764#define DEFINE_EVENT(template, call, proto, args) \
2239291a 765static inline void perf_test_probe_##call(void) \
6cc8a7c1 766{ \
2239291a 767 check_trace_callback_type_##call(perf_trace_##template); \
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768}
769
2239291a 770
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771#undef DEFINE_EVENT_PRINT
772#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
773 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
774
f413cdb8 775#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
07b139c8 776#endif /* CONFIG_PERF_EVENTS */
f413cdb8 777
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778#undef _TRACE_PROFILE_INIT
779