trace: Reorder struct ring_buffer_per_cpu to remove padding on 64bit
[deliverable/linux.git] / include / trace / ftrace.h
CommitLineData
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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#undef __cpparg
79#define __cpparg(arg...) arg
80
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81/* Callbacks are meaningless to ftrace. */
82#undef TRACE_EVENT_FN
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83#define TRACE_EVENT_FN(name, proto, args, tstruct, \
84 assign, print, reg, unreg) \
85 TRACE_EVENT(name, __cpparg(proto), __cpparg(args), \
86 __cpparg(tstruct), __cpparg(assign), __cpparg(print)) \
97419875 87
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88#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
89
9cbf1176 90
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91/*
92 * Stage 2 of the trace events.
93 *
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94 * Include the following:
95 *
7fcb7c47 96 * struct ftrace_data_offsets_<call> {
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97 * u32 <item1>;
98 * u32 <item2>;
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99 * [...]
100 * };
101 *
7d536cb3 102 * The __dynamic_array() macro will create each u32 <item>, this is
7fcb7c47 103 * to keep the offset of each array from the beginning of the event.
7d536cb3 104 * The size of an array is also encoded, in the higher 16 bits of <item>.
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105 */
106
7fcb7c47 107#undef __field
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108#define __field(type, item)
109
110#undef __field_ext
111#define __field_ext(type, item, filter_type)
7fcb7c47 112
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113#undef __array
114#define __array(type, item, len)
115
7fcb7c47 116#undef __dynamic_array
7d536cb3 117#define __dynamic_array(type, item, len) u32 item;
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118
119#undef __string
7fcb7c47 120#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 121
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122#undef DECLARE_EVENT_CLASS
123#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
7fcb7c47 124 struct ftrace_data_offsets_##call { \
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125 tstruct; \
126 };
127
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128#undef DEFINE_EVENT
129#define DEFINE_EVENT(template, name, proto, args)
130
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131#undef DEFINE_EVENT_PRINT
132#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
133 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
134
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135#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
136
137/*
138 * Stage 3 of the trace events.
139 *
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140 * Override the macros in <trace/trace_events.h> to include the following:
141 *
142 * enum print_line_t
143 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
144 * {
145 * struct trace_seq *s = &iter->seq;
146 * struct ftrace_raw_<call> *field; <-- defined in stage 1
147 * struct trace_entry *entry;
be74b73a 148 * struct trace_seq *p;
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149 * int ret;
150 *
151 * entry = iter->ent;
152 *
32c0edae 153 * if (entry->type != event_<call>->event.type) {
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154 * WARN_ON_ONCE(1);
155 * return TRACE_TYPE_UNHANDLED;
156 * }
157 *
158 * field = (typeof(field))entry;
159 *
50354a8a 160 * p = &get_cpu_var(ftrace_event_seq);
56d8bd3f 161 * trace_seq_init(p);
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162 * ret = trace_seq_printf(s, "%s: ", <call>);
163 * if (ret)
164 * ret = trace_seq_printf(s, <TP_printk> "\n");
be74b73a 165 * put_cpu();
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166 * if (!ret)
167 * return TRACE_TYPE_PARTIAL_LINE;
168 *
169 * return TRACE_TYPE_HANDLED;
170 * }
171 *
172 * This is the method used to print the raw event to the trace
173 * output format. Note, this is not needed if the data is read
174 * in binary.
175 */
176
177#undef __entry
178#define __entry field
179
180#undef TP_printk
181#define TP_printk(fmt, args...) fmt "\n", args
182
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183#undef __get_dynamic_array
184#define __get_dynamic_array(field) \
7d536cb3 185 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
7fcb7c47 186
9cbf1176 187#undef __get_str
7fcb7c47 188#define __get_str(field) (char *)__get_dynamic_array(field)
9cbf1176 189
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190#undef __print_flags
191#define __print_flags(flag, delim, flag_array...) \
192 ({ \
a48f494e 193 static const struct trace_print_flags __flags[] = \
be74b73a 194 { flag_array, { -1, NULL }}; \
a48f494e 195 ftrace_print_flags_seq(p, delim, flag, __flags); \
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196 })
197
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198#undef __print_symbolic
199#define __print_symbolic(value, symbol_array...) \
200 ({ \
201 static const struct trace_print_flags symbols[] = \
202 { symbol_array, { -1, NULL }}; \
203 ftrace_print_symbols_seq(p, value, symbols); \
204 })
205
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206#undef __print_hex
207#define __print_hex(buf, buf_len) ftrace_print_hex_seq(p, buf, buf_len)
208
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209#undef DECLARE_EVENT_CLASS
210#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 211static notrace enum print_line_t \
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212ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
213 struct trace_event *trace_event) \
f42c85e7 214{ \
80decc70 215 struct ftrace_event_call *event; \
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216 struct trace_seq *s = &iter->seq; \
217 struct ftrace_raw_##call *field; \
218 struct trace_entry *entry; \
be74b73a 219 struct trace_seq *p; \
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220 int ret; \
221 \
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222 event = container_of(trace_event, struct ftrace_event_call, \
223 event); \
224 \
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225 entry = iter->ent; \
226 \
32c0edae 227 if (entry->type != event->event.type) { \
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228 WARN_ON_ONCE(1); \
229 return TRACE_TYPE_UNHANDLED; \
230 } \
231 \
232 field = (typeof(field))entry; \
233 \
be74b73a 234 p = &get_cpu_var(ftrace_event_seq); \
56d8bd3f 235 trace_seq_init(p); \
80decc70 236 ret = trace_seq_printf(s, "%s: ", event->name); \
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237 if (ret) \
238 ret = trace_seq_printf(s, print); \
be74b73a 239 put_cpu(); \
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240 if (!ret) \
241 return TRACE_TYPE_PARTIAL_LINE; \
242 \
243 return TRACE_TYPE_HANDLED; \
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244} \
245static struct trace_event_functions ftrace_event_type_funcs_##call = { \
246 .trace = ftrace_raw_output_##call, \
247};
ff038f5c 248
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249#undef DEFINE_EVENT_PRINT
250#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
83f0d539 251static notrace enum print_line_t \
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252ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
253 struct trace_event *event) \
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254{ \
255 struct trace_seq *s = &iter->seq; \
256 struct ftrace_raw_##template *field; \
257 struct trace_entry *entry; \
258 struct trace_seq *p; \
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259 int ret; \
260 \
261 entry = iter->ent; \
262 \
32c0edae 263 if (entry->type != event_##call.event.type) { \
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264 WARN_ON_ONCE(1); \
265 return TRACE_TYPE_UNHANDLED; \
266 } \
267 \
268 field = (typeof(field))entry; \
269 \
be74b73a 270 p = &get_cpu_var(ftrace_event_seq); \
56d8bd3f 271 trace_seq_init(p); \
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272 ret = trace_seq_printf(s, "%s: ", #call); \
273 if (ret) \
274 ret = trace_seq_printf(s, print); \
be74b73a 275 put_cpu(); \
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276 if (!ret) \
277 return TRACE_TYPE_PARTIAL_LINE; \
278 \
279 return TRACE_TYPE_HANDLED; \
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280} \
281static struct trace_event_functions ftrace_event_type_funcs_##call = { \
282 .trace = ftrace_raw_output_##call, \
283};
e5bc9721 284
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285#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
286
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287#undef __field_ext
288#define __field_ext(type, item, filter_type) \
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289 ret = trace_define_field(event_call, #type, #item, \
290 offsetof(typeof(field), item), \
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291 sizeof(field.item), \
292 is_signed_type(type), filter_type); \
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293 if (ret) \
294 return ret;
295
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296#undef __field
297#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
298
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299#undef __array
300#define __array(type, item, len) \
301 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
302 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
303 offsetof(typeof(field), item), \
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304 sizeof(field.item), \
305 is_signed_type(type), FILTER_OTHER); \
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306 if (ret) \
307 return ret;
308
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309#undef __dynamic_array
310#define __dynamic_array(type, item, len) \
68fd60a8 311 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
43b51ead 312 offsetof(typeof(field), __data_loc_##item), \
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313 sizeof(field.__data_loc_##item), \
314 is_signed_type(type), FILTER_OTHER);
7fcb7c47 315
9cbf1176 316#undef __string
7fcb7c47 317#define __string(item, src) __dynamic_array(char, item, -1)
9cbf1176 318
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319#undef DECLARE_EVENT_CLASS
320#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, func, print) \
83f0d539 321static int notrace \
14be96c9 322ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
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323{ \
324 struct ftrace_raw_##call field; \
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325 int ret; \
326 \
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327 tstruct; \
328 \
329 return ret; \
330}
331
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332#undef DEFINE_EVENT
333#define DEFINE_EVENT(template, name, proto, args)
334
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335#undef DEFINE_EVENT_PRINT
336#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
337 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
338
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339#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
340
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341/*
342 * remember the offset of each array from the beginning of the event.
343 */
344
345#undef __entry
346#define __entry entry
347
348#undef __field
349#define __field(type, item)
350
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351#undef __field_ext
352#define __field_ext(type, item, filter_type)
353
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354#undef __array
355#define __array(type, item, len)
356
357#undef __dynamic_array
358#define __dynamic_array(type, item, len) \
359 __data_offsets->item = __data_size + \
360 offsetof(typeof(*entry), __data); \
7d536cb3 361 __data_offsets->item |= (len * sizeof(type)) << 16; \
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362 __data_size += (len) * sizeof(type);
363
364#undef __string
ff038f5c 365#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1)
7fcb7c47 366
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367#undef DECLARE_EVENT_CLASS
368#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 369static inline notrace int ftrace_get_offsets_##call( \
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370 struct ftrace_data_offsets_##call *__data_offsets, proto) \
371{ \
372 int __data_size = 0; \
373 struct ftrace_raw_##call __maybe_unused *entry; \
374 \
375 tstruct; \
376 \
377 return __data_size; \
378}
379
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380#undef DEFINE_EVENT
381#define DEFINE_EVENT(template, name, proto, args)
382
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383#undef DEFINE_EVENT_PRINT
384#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
385 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
386
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387#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
388
c32e827b 389/*
9cbf1176 390 * Stage 4 of the trace events.
c32e827b 391 *
ea20d929 392 * Override the macros in <trace/trace_events.h> to include the following:
c32e827b 393 *
157587d7 394 * For those macros defined with TRACE_EVENT:
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395 *
396 * static struct ftrace_event_call event_<call>;
397 *
2239291a 398 * static void ftrace_raw_event_<call>(void *__data, proto)
c32e827b 399 * {
2239291a 400 * struct ftrace_event_call *event_call = __data;
50354a8a 401 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
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402 * struct ring_buffer_event *event;
403 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
e77405ad 404 * struct ring_buffer *buffer;
ef18012b 405 * unsigned long irq_flags;
50354a8a 406 * int __data_size;
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407 * int pc;
408 *
409 * local_save_flags(irq_flags);
410 * pc = preempt_count();
411 *
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412 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
413 *
e77405ad 414 * event = trace_current_buffer_lock_reserve(&buffer,
32c0edae 415 * event_<call>->event.type,
50354a8a 416 * sizeof(*entry) + __data_size,
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417 * irq_flags, pc);
418 * if (!event)
419 * return;
420 * entry = ring_buffer_event_data(event);
421 *
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422 * { <assign>; } <-- Here we assign the entries by the __field and
423 * __array macros.
c32e827b 424 *
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425 * if (!filter_current_check_discard(buffer, event_call, entry, event))
426 * trace_current_buffer_unlock_commit(buffer,
427 * event, irq_flags, pc);
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428 * }
429 *
c32e827b 430 * static struct trace_event ftrace_event_type_<call> = {
ef18012b 431 * .trace = ftrace_raw_output_<call>, <-- stage 2
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432 * };
433 *
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434 * static const char print_fmt_<call>[] = <TP_printk>;
435 *
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436 * static struct ftrace_event_class __used event_class_<template> = {
437 * .system = "<system>",
2e33af02 438 * .define_fields = ftrace_define_fields_<call>,
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439 * .fields = LIST_HEAD_INIT(event_class_##call.fields),
440 * .raw_init = trace_event_raw_init,
441 * .probe = ftrace_raw_event_##call,
a1d0ce82 442 * .reg = ftrace_event_reg,
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443 * };
444 *
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445 * static struct ftrace_event_call __used
446 * __attribute__((__aligned__(4)))
447 * __attribute__((section("_ftrace_events"))) event_<call> = {
ef18012b 448 * .name = "<call>",
8f082018 449 * .class = event_class_<template>,
2e33af02 450 * .event = &ftrace_event_type_<call>,
50354a8a 451 * .print_fmt = print_fmt_<call>,
8f082018 452 * };
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453 *
454 */
455
07b139c8 456#ifdef CONFIG_PERF_EVENTS
ac199db0 457
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458#define _TRACE_PERF_PROTO(call, proto) \
459 static notrace void \
460 perf_trace_##call(void *__data, proto);
461
97d5a220 462#define _TRACE_PERF_INIT(call) \
2239291a 463 .perf_probe = perf_trace_##call,
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464
465#else
2239291a 466#define _TRACE_PERF_PROTO(call, proto)
97d5a220 467#define _TRACE_PERF_INIT(call)
07b139c8 468#endif /* CONFIG_PERF_EVENTS */
ac199db0 469
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470#undef __entry
471#define __entry entry
d20e3b03 472
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473#undef __field
474#define __field(type, item)
475
476#undef __array
477#define __array(type, item, len)
478
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479#undef __dynamic_array
480#define __dynamic_array(type, item, len) \
481 __entry->__data_loc_##item = __data_offsets.item;
482
9cbf1176 483#undef __string
7fcb7c47 484#define __string(item, src) __dynamic_array(char, item, -1) \
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485
486#undef __assign_str
487#define __assign_str(dst, src) \
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488 strcpy(__get_str(dst), src);
489
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490#undef TP_fast_assign
491#define TP_fast_assign(args...) args
492
493#undef TP_perf_assign
494#define TP_perf_assign(args...)
495
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496#undef DECLARE_EVENT_CLASS
497#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
c32e827b 498 \
83f0d539 499static notrace void \
2239291a 500ftrace_raw_event_##call(void *__data, proto) \
c32e827b 501{ \
2239291a 502 struct ftrace_event_call *event_call = __data; \
7fcb7c47 503 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
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504 struct ring_buffer_event *event; \
505 struct ftrace_raw_##call *entry; \
e77405ad 506 struct ring_buffer *buffer; \
c32e827b 507 unsigned long irq_flags; \
7fcb7c47 508 int __data_size; \
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SR
509 int pc; \
510 \
511 local_save_flags(irq_flags); \
512 pc = preempt_count(); \
513 \
7fcb7c47 514 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
9cbf1176 515 \
e77405ad 516 event = trace_current_buffer_lock_reserve(&buffer, \
32c0edae 517 event_call->event.type, \
7fcb7c47 518 sizeof(*entry) + __data_size, \
9cbf1176 519 irq_flags, pc); \
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520 if (!event) \
521 return; \
522 entry = ring_buffer_event_data(event); \
523 \
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524 tstruct \
525 \
a9c1c3ab 526 { assign; } \
c32e827b 527 \
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528 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
529 trace_nowake_buffer_unlock_commit(buffer, \
530 event, irq_flags, pc); \
ff038f5c 531}
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532/*
533 * The ftrace_test_probe is compiled out, it is only here as a build time check
534 * to make sure that if the tracepoint handling changes, the ftrace probe will
535 * fail to compile unless it too is updated.
536 */
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537
538#undef DEFINE_EVENT
539#define DEFINE_EVENT(template, call, proto, args) \
2239291a 540static inline void ftrace_test_probe_##call(void) \
c32e827b 541{ \
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542 check_trace_callback_type_##call(ftrace_raw_event_##template); \
543}
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544
545#undef DEFINE_EVENT_PRINT
80decc70 546#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
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547
548#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
549
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550#undef __entry
551#define __entry REC
552
553#undef __print_flags
554#undef __print_symbolic
555#undef __get_dynamic_array
556#undef __get_str
557
558#undef TP_printk
559#define TP_printk(fmt, args...) "\"" fmt "\", " __stringify(args)
560
091ad365 561#undef DECLARE_EVENT_CLASS
509e760c 562#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
2239291a 563_TRACE_PERF_PROTO(call, PARAMS(proto)); \
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SR
564static const char print_fmt_##call[] = print; \
565static struct ftrace_event_class __used event_class_##call = { \
2239291a 566 .system = __stringify(TRACE_SYSTEM), \
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SR
567 .define_fields = ftrace_define_fields_##call, \
568 .fields = LIST_HEAD_INIT(event_class_##call.fields),\
0405ab80 569 .raw_init = trace_event_raw_init, \
2239291a 570 .probe = ftrace_raw_event_##call, \
a1d0ce82 571 .reg = ftrace_event_reg, \
2239291a 572 _TRACE_PERF_INIT(call) \
8f082018 573};
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SR
574
575#undef DEFINE_EVENT
576#define DEFINE_EVENT(template, call, proto, args) \
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SR
577 \
578static struct ftrace_event_call __used \
579__attribute__((__aligned__(4))) \
580__attribute__((section("_ftrace_events"))) event_##call = { \
ef18012b 581 .name = #call, \
8f082018 582 .class = &event_class_##template, \
80decc70 583 .event.funcs = &ftrace_event_type_funcs_##template, \
509e760c 584 .print_fmt = print_fmt_##template, \
8f082018 585};
ac199db0 586
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587#undef DEFINE_EVENT_PRINT
588#define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
c32e827b 589 \
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590static const char print_fmt_##call[] = print; \
591 \
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SR
592static struct ftrace_event_call __used \
593__attribute__((__aligned__(4))) \
594__attribute__((section("_ftrace_events"))) event_##call = { \
ef18012b 595 .name = #call, \
8f082018 596 .class = &event_class_##template, \
80decc70 597 .event.funcs = &ftrace_event_type_funcs_##call, \
509e760c 598 .print_fmt = print_fmt_##call, \
c32e827b 599}
ac199db0 600
f42c85e7 601#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
ac199db0 602
f413cdb8 603/*
97d5a220 604 * Define the insertion callback to perf events
f413cdb8
FW
605 *
606 * The job is very similar to ftrace_raw_event_<call> except that we don't
607 * insert in the ring buffer but in a perf counter.
608 *
97d5a220 609 * static void ftrace_perf_<call>(proto)
f413cdb8
FW
610 * {
611 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
612 * struct ftrace_event_call *event_call = &event_<call>;
cdd6c482 613 * extern void perf_tp_event(int, u64, u64, void *, int);
f413cdb8 614 * struct ftrace_raw_##call *entry;
444a2a3b 615 * struct perf_trace_buf *trace_buf;
f413cdb8
FW
616 * u64 __addr = 0, __count = 1;
617 * unsigned long irq_flags;
20ab4425 618 * struct trace_entry *ent;
f413cdb8
FW
619 * int __entry_size;
620 * int __data_size;
20ab4425 621 * int __cpu
f413cdb8
FW
622 * int pc;
623 *
f413cdb8
FW
624 * pc = preempt_count();
625 *
626 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
304703ab
FW
627 *
628 * // Below we want to get the aligned size by taking into account
629 * // the u32 field that will later store the buffer size
630 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
631 * sizeof(u64));
632 * __entry_size -= sizeof(u32);
f413cdb8 633 *
20ab4425
FW
634 * // Protect the non nmi buffer
635 * // This also protects the rcu read side
636 * local_irq_save(irq_flags);
637 * __cpu = smp_processor_id();
638 *
639 * if (in_nmi())
8d53dd54 640 * trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
20ab4425 641 * else
8d53dd54 642 * trace_buf = rcu_dereference_sched(perf_trace_buf);
20ab4425 643 *
444a2a3b 644 * if (!trace_buf)
20ab4425 645 * goto end;
f413cdb8 646 *
444a2a3b
FW
647 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
648 *
649 * // Avoid recursion from perf that could mess up the buffer
650 * if (trace_buf->recursion++)
651 * goto end_recursion;
652 *
653 * raw_data = trace_buf->buf;
654 *
655 * // Make recursion update visible before entering perf_tp_event
656 * // so that we protect from perf recursions.
657 *
658 * barrier();
1853db0e 659 *
20ab4425
FW
660 * //zero dead bytes from alignment to avoid stack leak to userspace:
661 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
662 * entry = (struct ftrace_raw_<call> *)raw_data;
663 * ent = &entry->ent;
664 * tracing_generic_entry_update(ent, irq_flags, pc);
665 * ent->type = event_call->id;
f413cdb8 666 *
20ab4425 667 * <tstruct> <- do some jobs with dynamic arrays
f413cdb8 668 *
20ab4425 669 * <assign> <- affect our values
f413cdb8 670 *
43c1266c 671 * perf_tp_event(event_call->id, __addr, __count, entry,
20ab4425 672 * __entry_size); <- submit them to perf counter
f413cdb8
FW
673 *
674 * }
675 */
676
07b139c8 677#ifdef CONFIG_PERF_EVENTS
f413cdb8 678
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679#undef __entry
680#define __entry entry
681
682#undef __get_dynamic_array
683#define __get_dynamic_array(field) \
684 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
685
686#undef __get_str
687#define __get_str(field) (char *)__get_dynamic_array(field)
688
f413cdb8
FW
689#undef __perf_addr
690#define __perf_addr(a) __addr = (a)
691
692#undef __perf_count
693#define __perf_count(c) __count = (c)
694
091ad365
IM
695#undef DECLARE_EVENT_CLASS
696#define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
83f0d539 697static notrace void \
2239291a 698perf_trace_##call(void *__data, proto) \
f413cdb8 699{ \
2239291a 700 struct ftrace_event_call *event_call = __data; \
f413cdb8 701 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
f413cdb8 702 struct ftrace_raw_##call *entry; \
ff5f149b 703 struct pt_regs __regs; \
f413cdb8 704 u64 __addr = 0, __count = 1; \
1c024eca 705 struct hlist_head *head; \
f413cdb8
FW
706 int __entry_size; \
707 int __data_size; \
4ed7c92d 708 int rctx; \
f413cdb8 709 \
b0f82b81 710 perf_fetch_caller_regs(&__regs); \
f0218b3e 711 \
f413cdb8 712 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
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713 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
714 sizeof(u64)); \
304703ab 715 __entry_size -= sizeof(u32); \
f413cdb8 716 \
97d5a220 717 if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
20ab4425
FW
718 "profile buffer not large enough")) \
719 return; \
b7e2ecef 720 \
97d5a220 721 entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
ff5f149b 722 __entry_size, event_call->event.type, &__regs, &rctx); \
430ad5a6
XG
723 if (!entry) \
724 return; \
b7e2ecef 725 \
20ab4425
FW
726 tstruct \
727 \
728 { assign; } \
729 \
3771f077 730 head = this_cpu_ptr(event_call->perf_events); \
97d5a220 731 perf_trace_buf_submit(entry, __entry_size, rctx, __addr, \
ff5f149b 732 __count, &__regs, head); \
f413cdb8
FW
733}
734
2239291a
SR
735/*
736 * This part is compiled out, it is only here as a build time check
737 * to make sure that if the tracepoint handling changes, the
738 * perf probe will fail to compile unless it too is updated.
739 */
ff038f5c 740#undef DEFINE_EVENT
6cc8a7c1 741#define DEFINE_EVENT(template, call, proto, args) \
2239291a 742static inline void perf_test_probe_##call(void) \
6cc8a7c1 743{ \
2239291a 744 check_trace_callback_type_##call(perf_trace_##template); \
ff038f5c
SR
745}
746
2239291a 747
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SR
748#undef DEFINE_EVENT_PRINT
749#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
750 DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
751
f413cdb8 752#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
07b139c8 753#endif /* CONFIG_PERF_EVENTS */
f413cdb8 754
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755#undef _TRACE_PROFILE_INIT
756
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