blob: 4945d1c998645548a818a939bf1ad30b0a497734 [file] [log] [blame]
Steven Rostedtf42c85e2009-04-13 12:25:37 -04001/*
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
Steven Rostedtf42c85e2009-04-13 12:25:37 -040021#undef __field
22#define __field(type, item) type item;
23
Li Zefan43b51ea2009-08-07 10:33:22 +080024#undef __field_ext
25#define __field_ext(type, item, filter_type) type item;
26
Li Zefan7fcb7c42009-06-01 15:35:46 +080027#undef __array
28#define __array(type, item, len) type item[len];
29
30#undef __dynamic_array
Li Zefan7d536cb2009-07-16 10:54:02 +080031#define __dynamic_array(type, item, len) u32 __data_loc_##item;
Li Zefan7fcb7c42009-06-01 15:35:46 +080032
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020033#undef __string
Li Zefan7fcb7c42009-06-01 15:35:46 +080034#define __string(item, src) __dynamic_array(char, item, -1)
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020035
Steven Rostedtf42c85e2009-04-13 12:25:37 -040036#undef TP_STRUCT__entry
37#define TP_STRUCT__entry(args...) args
38
39#undef TRACE_EVENT
40#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
41 struct ftrace_raw_##name { \
42 struct trace_entry ent; \
43 tstruct \
Li Zefan7fcb7c42009-06-01 15:35:46 +080044 char __data[0]; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -040045 }; \
46 static struct ftrace_event_call event_##name
47
Frederic Weisbecker0dd7b742009-08-28 00:50:06 +020048#undef __cpparg
49#define __cpparg(arg...) arg
50
Josh Stone97419872009-08-24 14:43:13 -070051/* Callbacks are meaningless to ftrace. */
52#undef TRACE_EVENT_FN
Frederic Weisbecker0dd7b742009-08-28 00:50:06 +020053#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)) \
Josh Stone97419872009-08-24 14:43:13 -070057
Steven Rostedtf42c85e2009-04-13 12:25:37 -040058#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
59
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020060
Steven Rostedtf42c85e2009-04-13 12:25:37 -040061/*
62 * Stage 2 of the trace events.
63 *
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020064 * Include the following:
65 *
Li Zefan7fcb7c42009-06-01 15:35:46 +080066 * struct ftrace_data_offsets_<call> {
Li Zefan7d536cb2009-07-16 10:54:02 +080067 * u32 <item1>;
68 * u32 <item2>;
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020069 * [...]
70 * };
71 *
Li Zefan7d536cb2009-07-16 10:54:02 +080072 * The __dynamic_array() macro will create each u32 <item>, this is
Li Zefan7fcb7c42009-06-01 15:35:46 +080073 * to keep the offset of each array from the beginning of the event.
Li Zefan7d536cb2009-07-16 10:54:02 +080074 * The size of an array is also encoded, in the higher 16 bits of <item>.
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020075 */
76
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020077#undef __field
Li Zefan43b51ea2009-08-07 10:33:22 +080078#define __field(type, item)
79
80#undef __field_ext
81#define __field_ext(type, item, filter_type)
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020082
Li Zefan7fcb7c42009-06-01 15:35:46 +080083#undef __array
84#define __array(type, item, len)
85
86#undef __dynamic_array
Li Zefan7d536cb2009-07-16 10:54:02 +080087#define __dynamic_array(type, item, len) u32 item;
Li Zefan7fcb7c42009-06-01 15:35:46 +080088
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020089#undef __string
Li Zefan7fcb7c42009-06-01 15:35:46 +080090#define __string(item, src) __dynamic_array(char, item, -1)
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020091
92#undef TRACE_EVENT
93#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
Li Zefan7fcb7c42009-06-01 15:35:46 +080094 struct ftrace_data_offsets_##call { \
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +020095 tstruct; \
96 };
97
98#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
99
100/*
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400101 * Setup the showing format of trace point.
102 *
103 * int
104 * ftrace_format_##call(struct trace_seq *s)
105 * {
106 * struct ftrace_raw_##call field;
107 * int ret;
108 *
109 * ret = trace_seq_printf(s, #type " " #item ";"
110 * " offset:%u; size:%u;\n",
111 * offsetof(struct ftrace_raw_##call, item),
112 * sizeof(field.type));
113 *
114 * }
115 */
116
117#undef TP_STRUCT__entry
118#define TP_STRUCT__entry(args...) args
119
120#undef __field
121#define __field(type, item) \
122 ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \
Tom Zanussi26a50742009-10-06 01:09:50 -0500123 "offset:%u;\tsize:%u;\tsigned:%u;\n", \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400124 (unsigned int)offsetof(typeof(field), item), \
Tom Zanussi26a50742009-10-06 01:09:50 -0500125 (unsigned int)sizeof(field.item), \
126 (unsigned int)is_signed_type(type)); \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400127 if (!ret) \
128 return 0;
129
Li Zefan43b51ea2009-08-07 10:33:22 +0800130#undef __field_ext
131#define __field_ext(type, item, filter_type) __field(type, item)
132
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400133#undef __array
134#define __array(type, item, len) \
135 ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \
Tom Zanussi26a50742009-10-06 01:09:50 -0500136 "offset:%u;\tsize:%u;\tsigned:%u;\n", \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400137 (unsigned int)offsetof(typeof(field), item), \
Tom Zanussi26a50742009-10-06 01:09:50 -0500138 (unsigned int)sizeof(field.item), \
139 (unsigned int)is_signed_type(type)); \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400140 if (!ret) \
141 return 0;
142
143#undef __dynamic_array
144#define __dynamic_array(type, item, len) \
Lai Jiangshan68fd60a2009-07-16 10:53:34 +0800145 ret = trace_seq_printf(s, "\tfield:__data_loc " #type "[] " #item ";\t"\
Tom Zanussi26a50742009-10-06 01:09:50 -0500146 "offset:%u;\tsize:%u;\tsigned:%u;\n", \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400147 (unsigned int)offsetof(typeof(field), \
148 __data_loc_##item), \
Tom Zanussi26a50742009-10-06 01:09:50 -0500149 (unsigned int)sizeof(field.__data_loc_##item), \
150 (unsigned int)is_signed_type(type)); \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400151 if (!ret) \
152 return 0;
153
154#undef __string
155#define __string(item, src) __dynamic_array(char, item, -1)
156
157#undef __entry
158#define __entry REC
159
160#undef __print_symbolic
161#undef __get_dynamic_array
162#undef __get_str
163
164#undef TP_printk
165#define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args)
166
167#undef TP_fast_assign
168#define TP_fast_assign(args...) args
169
Peter Zijlstra3a659302009-07-21 17:34:57 +0200170#undef TP_perf_assign
171#define TP_perf_assign(args...)
172
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400173#undef TRACE_EVENT
174#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
175static int \
Frederic Weisbeckere8f9f4d2009-08-11 17:42:52 +0200176ftrace_format_##call(struct ftrace_event_call *unused, \
177 struct trace_seq *s) \
Steven Rostedt6ff9a642009-06-10 14:28:34 -0400178{ \
179 struct ftrace_raw_##call field __attribute__((unused)); \
180 int ret = 0; \
181 \
182 tstruct; \
183 \
184 trace_seq_printf(s, "\nprint fmt: " print); \
185 \
186 return ret; \
187}
188
189#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
190
191/*
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200192 * Stage 3 of the trace events.
193 *
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400194 * Override the macros in <trace/trace_events.h> to include the following:
195 *
196 * enum print_line_t
197 * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags)
198 * {
199 * struct trace_seq *s = &iter->seq;
200 * struct ftrace_raw_<call> *field; <-- defined in stage 1
201 * struct trace_entry *entry;
Steven Rostedtbe74b732009-05-26 20:25:22 +0200202 * struct trace_seq *p;
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400203 * int ret;
204 *
205 * entry = iter->ent;
206 *
207 * if (entry->type != event_<call>.id) {
208 * WARN_ON_ONCE(1);
209 * return TRACE_TYPE_UNHANDLED;
210 * }
211 *
212 * field = (typeof(field))entry;
213 *
Steven Rostedtbe74b732009-05-26 20:25:22 +0200214 * p = get_cpu_var(ftrace_event_seq);
Steven Whitehouse56d8bd32009-06-03 14:52:03 +0100215 * trace_seq_init(p);
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400216 * ret = trace_seq_printf(s, <TP_printk> "\n");
Steven Rostedtbe74b732009-05-26 20:25:22 +0200217 * put_cpu();
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400218 * if (!ret)
219 * return TRACE_TYPE_PARTIAL_LINE;
220 *
221 * return TRACE_TYPE_HANDLED;
222 * }
223 *
224 * This is the method used to print the raw event to the trace
225 * output format. Note, this is not needed if the data is read
226 * in binary.
227 */
228
229#undef __entry
230#define __entry field
231
232#undef TP_printk
233#define TP_printk(fmt, args...) fmt "\n", args
234
Li Zefan7fcb7c42009-06-01 15:35:46 +0800235#undef __get_dynamic_array
236#define __get_dynamic_array(field) \
Li Zefan7d536cb2009-07-16 10:54:02 +0800237 ((void *)__entry + (__entry->__data_loc_##field & 0xffff))
Li Zefan7fcb7c42009-06-01 15:35:46 +0800238
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200239#undef __get_str
Li Zefan7fcb7c42009-06-01 15:35:46 +0800240#define __get_str(field) (char *)__get_dynamic_array(field)
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200241
Steven Rostedtbe74b732009-05-26 20:25:22 +0200242#undef __print_flags
243#define __print_flags(flag, delim, flag_array...) \
244 ({ \
Steven Rostedta48f4942009-09-14 11:18:02 -0400245 static const struct trace_print_flags __flags[] = \
Steven Rostedtbe74b732009-05-26 20:25:22 +0200246 { flag_array, { -1, NULL }}; \
Steven Rostedta48f4942009-09-14 11:18:02 -0400247 ftrace_print_flags_seq(p, delim, flag, __flags); \
Steven Rostedtbe74b732009-05-26 20:25:22 +0200248 })
249
Steven Rostedt0f4fc292009-05-20 19:21:47 -0400250#undef __print_symbolic
251#define __print_symbolic(value, symbol_array...) \
252 ({ \
253 static const struct trace_print_flags symbols[] = \
254 { symbol_array, { -1, NULL }}; \
255 ftrace_print_symbols_seq(p, value, symbols); \
256 })
257
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400258#undef TRACE_EVENT
259#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
Steven Rostedtec827c72009-09-14 10:50:23 -0400260static enum print_line_t \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400261ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \
262{ \
263 struct trace_seq *s = &iter->seq; \
264 struct ftrace_raw_##call *field; \
265 struct trace_entry *entry; \
Steven Rostedtbe74b732009-05-26 20:25:22 +0200266 struct trace_seq *p; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400267 int ret; \
268 \
269 entry = iter->ent; \
270 \
271 if (entry->type != event_##call.id) { \
272 WARN_ON_ONCE(1); \
273 return TRACE_TYPE_UNHANDLED; \
274 } \
275 \
276 field = (typeof(field))entry; \
277 \
Steven Rostedtbe74b732009-05-26 20:25:22 +0200278 p = &get_cpu_var(ftrace_event_seq); \
Steven Whitehouse56d8bd32009-06-03 14:52:03 +0100279 trace_seq_init(p); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400280 ret = trace_seq_printf(s, #call ": " print); \
Steven Rostedtbe74b732009-05-26 20:25:22 +0200281 put_cpu(); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400282 if (!ret) \
283 return TRACE_TYPE_PARTIAL_LINE; \
284 \
285 return TRACE_TYPE_HANDLED; \
286}
287
288#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
289
Li Zefan43b51ea2009-08-07 10:33:22 +0800290#undef __field_ext
291#define __field_ext(type, item, filter_type) \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400292 ret = trace_define_field(event_call, #type, #item, \
293 offsetof(typeof(field), item), \
Li Zefan43b51ea2009-08-07 10:33:22 +0800294 sizeof(field.item), \
295 is_signed_type(type), filter_type); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400296 if (ret) \
297 return ret;
298
Li Zefan43b51ea2009-08-07 10:33:22 +0800299#undef __field
300#define __field(type, item) __field_ext(type, item, FILTER_OTHER)
301
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400302#undef __array
303#define __array(type, item, len) \
304 BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \
305 ret = trace_define_field(event_call, #type "[" #len "]", #item, \
306 offsetof(typeof(field), item), \
Li Zefan43b51ea2009-08-07 10:33:22 +0800307 sizeof(field.item), 0, FILTER_OTHER); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400308 if (ret) \
309 return ret;
310
Li Zefan7fcb7c42009-06-01 15:35:46 +0800311#undef __dynamic_array
312#define __dynamic_array(type, item, len) \
Lai Jiangshan68fd60a2009-07-16 10:53:34 +0800313 ret = trace_define_field(event_call, "__data_loc " #type "[]", #item, \
Li Zefan43b51ea2009-08-07 10:33:22 +0800314 offsetof(typeof(field), __data_loc_##item), \
315 sizeof(field.__data_loc_##item), 0, \
316 FILTER_OTHER);
Li Zefan7fcb7c42009-06-01 15:35:46 +0800317
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200318#undef __string
Li Zefan7fcb7c42009-06-01 15:35:46 +0800319#define __string(item, src) __dynamic_array(char, item, -1)
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200320
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400321#undef TRACE_EVENT
322#define TRACE_EVENT(call, proto, args, tstruct, func, print) \
Steven Rostedtec827c72009-09-14 10:50:23 -0400323static int \
Li Zefan14be96c2009-08-19 15:53:52 +0800324ftrace_define_fields_##call(struct ftrace_event_call *event_call) \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400325{ \
326 struct ftrace_raw_##call field; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400327 int ret; \
328 \
Li Zefane647d6b2009-08-19 15:54:32 +0800329 ret = trace_define_common_fields(event_call); \
330 if (ret) \
331 return ret; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400332 \
333 tstruct; \
334 \
335 return ret; \
336}
337
338#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
339
340/*
Li Zefan7fcb7c42009-06-01 15:35:46 +0800341 * remember the offset of each array from the beginning of the event.
342 */
343
344#undef __entry
345#define __entry entry
346
347#undef __field
348#define __field(type, item)
349
Li Zefan43b51ea2009-08-07 10:33:22 +0800350#undef __field_ext
351#define __field_ext(type, item, filter_type)
352
Li Zefan7fcb7c42009-06-01 15:35:46 +0800353#undef __array
354#define __array(type, item, len)
355
356#undef __dynamic_array
357#define __dynamic_array(type, item, len) \
358 __data_offsets->item = __data_size + \
359 offsetof(typeof(*entry), __data); \
Li Zefan7d536cb2009-07-16 10:54:02 +0800360 __data_offsets->item |= (len * sizeof(type)) << 16; \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800361 __data_size += (len) * sizeof(type);
362
363#undef __string
364#define __string(item, src) __dynamic_array(char, item, strlen(src) + 1) \
365
366#undef TRACE_EVENT
367#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
368static inline int ftrace_get_offsets_##call( \
369 struct ftrace_data_offsets_##call *__data_offsets, proto) \
370{ \
371 int __data_size = 0; \
372 struct ftrace_raw_##call __maybe_unused *entry; \
373 \
374 tstruct; \
375 \
376 return __data_size; \
377}
378
379#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
380
Peter Zijlstra3a659302009-07-21 17:34:57 +0200381#ifdef CONFIG_EVENT_PROFILE
382
383/*
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200384 * Generate the functions needed for tracepoint perf_event support.
Peter Zijlstra3a659302009-07-21 17:34:57 +0200385 *
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200386 * NOTE: The insertion profile callback (ftrace_profile_<call>) is defined later
Peter Zijlstra3a659302009-07-21 17:34:57 +0200387 *
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200388 * static int ftrace_profile_enable_<call>(void)
Peter Zijlstra3a659302009-07-21 17:34:57 +0200389 * {
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200390 * return register_trace_<call>(ftrace_profile_<call>);
Peter Zijlstra3a659302009-07-21 17:34:57 +0200391 * }
392 *
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200393 * static void ftrace_profile_disable_<call>(void)
Peter Zijlstra3a659302009-07-21 17:34:57 +0200394 * {
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200395 * unregister_trace_<call>(ftrace_profile_<call>);
Peter Zijlstra3a659302009-07-21 17:34:57 +0200396 * }
397 *
398 */
399
Peter Zijlstra3a659302009-07-21 17:34:57 +0200400#undef TRACE_EVENT
401#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
402 \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200403static void ftrace_profile_##call(proto); \
Peter Zijlstra3a659302009-07-21 17:34:57 +0200404 \
Frederic Weisbeckerd7a4b412009-09-23 23:08:43 +0200405static int ftrace_profile_enable_##call(struct ftrace_event_call *unused)\
Peter Zijlstra3a659302009-07-21 17:34:57 +0200406{ \
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200407 return register_trace_##call(ftrace_profile_##call); \
Peter Zijlstra3a659302009-07-21 17:34:57 +0200408} \
409 \
Frederic Weisbeckerd7a4b412009-09-23 23:08:43 +0200410static void ftrace_profile_disable_##call(struct ftrace_event_call *unused)\
Peter Zijlstra3a659302009-07-21 17:34:57 +0200411{ \
Frederic Weisbeckere5e25cf2009-09-18 00:54:43 +0200412 unregister_trace_##call(ftrace_profile_##call); \
Peter Zijlstra3a659302009-07-21 17:34:57 +0200413}
414
415#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
416
Peter Zijlstra3a659302009-07-21 17:34:57 +0200417#endif
418
Li Zefan7fcb7c42009-06-01 15:35:46 +0800419/*
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200420 * Stage 4 of the trace events.
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400421 *
422 * Override the macros in <trace/trace_events.h> to include the following:
423 *
424 * static void ftrace_event_<call>(proto)
425 * {
426 * event_trace_printk(_RET_IP_, "<call>: " <fmt>);
427 * }
428 *
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400429 * static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400430 * {
431 * int ret;
432 *
433 * ret = register_trace_<call>(ftrace_event_<call>);
434 * if (!ret)
435 * pr_info("event trace: Could not activate trace point "
436 * "probe to <call>");
437 * return ret;
438 * }
439 *
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400440 * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400441 * {
442 * unregister_trace_<call>(ftrace_event_<call>);
443 * }
444 *
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400445 *
446 * For those macros defined with TRACE_EVENT:
447 *
448 * static struct ftrace_event_call event_<call>;
449 *
450 * static void ftrace_raw_event_<call>(proto)
451 * {
452 * struct ring_buffer_event *event;
453 * struct ftrace_raw_<call> *entry; <-- defined in stage 1
Steven Rostedte77405a2009-09-02 14:17:06 -0400454 * struct ring_buffer *buffer;
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400455 * unsigned long irq_flags;
456 * int pc;
457 *
458 * local_save_flags(irq_flags);
459 * pc = preempt_count();
460 *
Steven Rostedte77405a2009-09-02 14:17:06 -0400461 * event = trace_current_buffer_lock_reserve(&buffer,
462 * event_<call>.id,
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400463 * sizeof(struct ftrace_raw_<call>),
464 * irq_flags, pc);
465 * if (!event)
466 * return;
467 * entry = ring_buffer_event_data(event);
468 *
469 * <assign>; <-- Here we assign the entries by the __field and
470 * __array macros.
471 *
Steven Rostedte77405a2009-09-02 14:17:06 -0400472 * trace_current_buffer_unlock_commit(buffer, event, irq_flags, pc);
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400473 * }
474 *
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400475 * static int ftrace_raw_reg_event_<call>(struct ftrace_event_call *unused)
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400476 * {
477 * int ret;
478 *
479 * ret = register_trace_<call>(ftrace_raw_event_<call>);
480 * if (!ret)
481 * pr_info("event trace: Could not activate trace point "
482 * "probe to <call>");
483 * return ret;
484 * }
485 *
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400486 * static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400487 * {
488 * unregister_trace_<call>(ftrace_raw_event_<call>);
489 * }
490 *
491 * static struct trace_event ftrace_event_type_<call> = {
492 * .trace = ftrace_raw_output_<call>, <-- stage 2
493 * };
494 *
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400495 * static int ftrace_raw_init_event_<call>(struct ftrace_event_call *unused)
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400496 * {
497 * int id;
498 *
499 * id = register_ftrace_event(&ftrace_event_type_<call>);
500 * if (!id)
501 * return -ENODEV;
502 * event_<call>.id = id;
503 * return 0;
504 * }
505 *
506 * static struct ftrace_event_call __used
507 * __attribute__((__aligned__(4)))
508 * __attribute__((section("_ftrace_events"))) event_<call> = {
509 * .name = "<call>",
510 * .system = "<system>",
511 * .raw_init = ftrace_raw_init_event_<call>,
512 * .regfunc = ftrace_reg_event_<call>,
513 * .unregfunc = ftrace_unreg_event_<call>,
514 * .show_format = ftrace_format_<call>,
515 * }
516 *
517 */
518
519#undef TP_FMT
520#define TP_FMT(fmt, args...) fmt "\n", ##args
521
522#ifdef CONFIG_EVENT_PROFILE
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400523
524#define _TRACE_PROFILE_INIT(call) \
525 .profile_count = ATOMIC_INIT(-1), \
526 .profile_enable = ftrace_profile_enable_##call, \
527 .profile_disable = ftrace_profile_disable_##call,
528
529#else
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400530#define _TRACE_PROFILE_INIT(call)
531#endif
532
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400533#undef __entry
534#define __entry entry
535
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200536#undef __field
537#define __field(type, item)
538
539#undef __array
540#define __array(type, item, len)
541
Li Zefan7fcb7c42009-06-01 15:35:46 +0800542#undef __dynamic_array
543#define __dynamic_array(type, item, len) \
544 __entry->__data_loc_##item = __data_offsets.item;
545
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200546#undef __string
Li Zefan7fcb7c42009-06-01 15:35:46 +0800547#define __string(item, src) __dynamic_array(char, item, -1) \
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200548
549#undef __assign_str
550#define __assign_str(dst, src) \
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200551 strcpy(__get_str(dst), src);
552
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400553#undef TRACE_EVENT
554#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400555 \
556static struct ftrace_event_call event_##call; \
557 \
558static void ftrace_raw_event_##call(proto) \
559{ \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800560 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
Zhaoleif2aebae2009-05-27 21:36:02 +0800561 struct ftrace_event_call *event_call = &event_##call; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400562 struct ring_buffer_event *event; \
563 struct ftrace_raw_##call *entry; \
Steven Rostedte77405a2009-09-02 14:17:06 -0400564 struct ring_buffer *buffer; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400565 unsigned long irq_flags; \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800566 int __data_size; \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400567 int pc; \
568 \
569 local_save_flags(irq_flags); \
570 pc = preempt_count(); \
571 \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800572 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200573 \
Steven Rostedte77405a2009-09-02 14:17:06 -0400574 event = trace_current_buffer_lock_reserve(&buffer, \
575 event_##call.id, \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800576 sizeof(*entry) + __data_size, \
Frederic Weisbecker9cbf1172009-04-19 04:51:29 +0200577 irq_flags, pc); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400578 if (!event) \
579 return; \
580 entry = ring_buffer_event_data(event); \
581 \
Li Zefan7fcb7c42009-06-01 15:35:46 +0800582 \
583 tstruct \
584 \
Li Zefana9c1c3a2009-06-01 15:35:13 +0800585 { assign; } \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400586 \
Steven Rostedte77405a2009-09-02 14:17:06 -0400587 if (!filter_current_check_discard(buffer, event_call, entry, event)) \
588 trace_nowake_buffer_unlock_commit(buffer, \
589 event, irq_flags, pc); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400590} \
591 \
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400592static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400593{ \
594 int ret; \
595 \
596 ret = register_trace_##call(ftrace_raw_event_##call); \
597 if (ret) \
598 pr_info("event trace: Could not activate trace point " \
599 "probe to " #call "\n"); \
600 return ret; \
601} \
602 \
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400603static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400604{ \
605 unregister_trace_##call(ftrace_raw_event_##call); \
606} \
607 \
608static struct trace_event ftrace_event_type_##call = { \
609 .trace = ftrace_raw_output_##call, \
610}; \
611 \
Masami Hiramatsubd1a5c82009-08-13 16:34:53 -0400612static int ftrace_raw_init_event_##call(struct ftrace_event_call *unused)\
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400613{ \
614 int id; \
615 \
616 id = register_ftrace_event(&ftrace_event_type_##call); \
617 if (!id) \
618 return -ENODEV; \
619 event_##call.id = id; \
620 INIT_LIST_HEAD(&event_##call.fields); \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400621 return 0; \
622} \
623 \
624static struct ftrace_event_call __used \
625__attribute__((__aligned__(4))) \
626__attribute__((section("_ftrace_events"))) event_##call = { \
627 .name = #call, \
628 .system = __stringify(TRACE_SYSTEM), \
Steven Rostedt6d723732009-04-10 14:53:50 -0400629 .event = &ftrace_event_type_##call, \
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400630 .raw_init = ftrace_raw_init_event_##call, \
631 .regfunc = ftrace_raw_reg_event_##call, \
632 .unregfunc = ftrace_raw_unreg_event_##call, \
633 .show_format = ftrace_format_##call, \
634 .define_fields = ftrace_define_fields_##call, \
635 _TRACE_PROFILE_INIT(call) \
636}
637
638#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
639
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200640/*
641 * Define the insertion callback to profile events
642 *
643 * The job is very similar to ftrace_raw_event_<call> except that we don't
644 * insert in the ring buffer but in a perf counter.
645 *
646 * static void ftrace_profile_<call>(proto)
647 * {
648 * struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
649 * struct ftrace_event_call *event_call = &event_<call>;
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200650 * extern void perf_tp_event(int, u64, u64, void *, int);
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200651 * struct ftrace_raw_##call *entry;
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100652 * struct perf_trace_buf *trace_buf;
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200653 * u64 __addr = 0, __count = 1;
654 * unsigned long irq_flags;
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200655 * struct trace_entry *ent;
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200656 * int __entry_size;
657 * int __data_size;
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200658 * int __cpu
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200659 * int pc;
660 *
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200661 * pc = preempt_count();
662 *
663 * __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
Frederic Weisbecker304703a2009-08-10 16:11:32 +0200664 *
665 * // Below we want to get the aligned size by taking into account
666 * // the u32 field that will later store the buffer size
667 * __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
668 * sizeof(u64));
669 * __entry_size -= sizeof(u32);
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200670 *
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200671 * // Protect the non nmi buffer
672 * // This also protects the rcu read side
673 * local_irq_save(irq_flags);
674 * __cpu = smp_processor_id();
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200675 *
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200676 * if (in_nmi())
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100677 * trace_buf = rcu_dereference(perf_trace_buf_nmi);
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200678 * else
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100679 * trace_buf = rcu_dereference(perf_trace_buf);
Frederic Weisbecker1853db02009-08-10 16:38:36 +0200680 *
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100681 * if (!trace_buf)
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200682 * goto end;
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200683 *
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100684 * trace_buf = per_cpu_ptr(trace_buf, __cpu);
685 *
686 * // Avoid recursion from perf that could mess up the buffer
687 * if (trace_buf->recursion++)
688 * goto end_recursion;
689 *
690 * raw_data = trace_buf->buf;
691 *
692 * // Make recursion update visible before entering perf_tp_event
693 * // so that we protect from perf recursions.
694 *
695 * barrier();
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200696 *
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200697 * //zero dead bytes from alignment to avoid stack leak to userspace:
698 * *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
699 * entry = (struct ftrace_raw_<call> *)raw_data;
700 * ent = &entry->ent;
701 * tracing_generic_entry_update(ent, irq_flags, pc);
702 * ent->type = event_call->id;
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200703 *
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200704 * <tstruct> <- do some jobs with dynamic arrays
705 *
706 * <assign> <- affect our values
707 *
Linus Torvalds43c12662009-09-21 09:15:07 -0700708 * perf_tp_event(event_call->id, __addr, __count, entry,
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200709 * __entry_size); <- submit them to perf counter
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200710 *
711 * }
712 */
713
714#ifdef CONFIG_EVENT_PROFILE
715
716#undef __perf_addr
717#define __perf_addr(a) __addr = (a)
718
719#undef __perf_count
720#define __perf_count(c) __count = (c)
721
722#undef TRACE_EVENT
723#define TRACE_EVENT(call, proto, args, tstruct, assign, print) \
724static void ftrace_profile_##call(proto) \
725{ \
726 struct ftrace_data_offsets_##call __maybe_unused __data_offsets;\
727 struct ftrace_event_call *event_call = &event_##call; \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100728 extern void perf_tp_event(int, u64, u64, void *, int); \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200729 struct ftrace_raw_##call *entry; \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100730 struct perf_trace_buf *trace_buf; \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200731 u64 __addr = 0, __count = 1; \
732 unsigned long irq_flags; \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200733 struct trace_entry *ent; \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200734 int __entry_size; \
735 int __data_size; \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200736 char *raw_data; \
737 int __cpu; \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200738 int pc; \
739 \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200740 pc = preempt_count(); \
741 \
742 __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
Peter Zijlstraa0445602009-08-10 11:16:52 +0200743 __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
744 sizeof(u64)); \
Frederic Weisbecker304703a2009-08-10 16:11:32 +0200745 __entry_size -= sizeof(u32); \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200746 \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200747 if (WARN_ONCE(__entry_size > FTRACE_MAX_PROFILE_SIZE, \
748 "profile buffer not large enough")) \
749 return; \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200750 \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200751 local_irq_save(irq_flags); \
752 __cpu = smp_processor_id(); \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200753 \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200754 if (in_nmi()) \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100755 trace_buf = rcu_dereference(perf_trace_buf_nmi); \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200756 else \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100757 trace_buf = rcu_dereference(perf_trace_buf); \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200758 \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100759 if (!trace_buf) \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200760 goto end; \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200761 \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100762 trace_buf = per_cpu_ptr(trace_buf, __cpu); \
763 if (trace_buf->recursion++) \
764 goto end_recursion; \
765 \
766 barrier(); \
767 \
768 raw_data = trace_buf->buf; \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200769 \
770 *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL; \
771 entry = (struct ftrace_raw_##call *)raw_data; \
772 ent = &entry->ent; \
773 tracing_generic_entry_update(ent, irq_flags, pc); \
774 ent->type = event_call->id; \
775 \
776 tstruct \
777 \
778 { assign; } \
779 \
Linus Torvalds43c12662009-09-21 09:15:07 -0700780 perf_tp_event(event_call->id, __addr, __count, entry, \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200781 __entry_size); \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200782 \
Frederic Weisbecker444a2a32009-11-06 04:13:05 +0100783end_recursion: \
784 trace_buf->recursion--; \
Frederic Weisbecker20ab44252009-09-18 06:10:28 +0200785end: \
786 local_irq_restore(irq_flags); \
Frederic Weisbeckerf413cdb2009-08-07 01:25:54 +0200787 \
788}
789
790#include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
791#endif /* CONFIG_EVENT_PROFILE */
792
Steven Rostedtf42c85e2009-04-13 12:25:37 -0400793#undef _TRACE_PROFILE_INIT
794