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Commit | Line | Data |
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f42c85e7 SR |
1 | /* |
2 | * Stage 1 of the trace events. | |
3 | * | |
4 | * Override the macros in <trace/trace_events.h> to include the following: | |
5 | * | |
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 | ||
21 | #undef TRACE_FORMAT | |
22 | #define TRACE_FORMAT(call, proto, args, fmt) | |
23 | ||
24 | #undef __array | |
25 | #define __array(type, item, len) type item[len]; | |
26 | ||
27 | #undef __field | |
28 | #define __field(type, item) type item; | |
29 | ||
30 | #undef TP_STRUCT__entry | |
31 | #define TP_STRUCT__entry(args...) args | |
32 | ||
33 | #undef TRACE_EVENT | |
34 | #define TRACE_EVENT(name, proto, args, tstruct, assign, print) \ | |
35 | struct ftrace_raw_##name { \ | |
36 | struct trace_entry ent; \ | |
37 | tstruct \ | |
38 | }; \ | |
39 | static struct ftrace_event_call event_##name | |
40 | ||
41 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) | |
42 | ||
43 | /* | |
44 | * Stage 2 of the trace events. | |
45 | * | |
46 | * Override the macros in <trace/trace_events.h> to include the following: | |
47 | * | |
48 | * enum print_line_t | |
49 | * ftrace_raw_output_<call>(struct trace_iterator *iter, int flags) | |
50 | * { | |
51 | * struct trace_seq *s = &iter->seq; | |
52 | * struct ftrace_raw_<call> *field; <-- defined in stage 1 | |
53 | * struct trace_entry *entry; | |
54 | * int ret; | |
55 | * | |
56 | * entry = iter->ent; | |
57 | * | |
58 | * if (entry->type != event_<call>.id) { | |
59 | * WARN_ON_ONCE(1); | |
60 | * return TRACE_TYPE_UNHANDLED; | |
61 | * } | |
62 | * | |
63 | * field = (typeof(field))entry; | |
64 | * | |
65 | * ret = trace_seq_printf(s, <TP_printk> "\n"); | |
66 | * if (!ret) | |
67 | * return TRACE_TYPE_PARTIAL_LINE; | |
68 | * | |
69 | * return TRACE_TYPE_HANDLED; | |
70 | * } | |
71 | * | |
72 | * This is the method used to print the raw event to the trace | |
73 | * output format. Note, this is not needed if the data is read | |
74 | * in binary. | |
75 | */ | |
76 | ||
77 | #undef __entry | |
78 | #define __entry field | |
79 | ||
80 | #undef TP_printk | |
81 | #define TP_printk(fmt, args...) fmt "\n", args | |
82 | ||
83 | #undef TRACE_EVENT | |
84 | #define TRACE_EVENT(call, proto, args, tstruct, assign, print) \ | |
85 | enum print_line_t \ | |
86 | ftrace_raw_output_##call(struct trace_iterator *iter, int flags) \ | |
87 | { \ | |
88 | struct trace_seq *s = &iter->seq; \ | |
89 | struct ftrace_raw_##call *field; \ | |
90 | struct trace_entry *entry; \ | |
91 | int ret; \ | |
92 | \ | |
93 | entry = iter->ent; \ | |
94 | \ | |
95 | if (entry->type != event_##call.id) { \ | |
96 | WARN_ON_ONCE(1); \ | |
97 | return TRACE_TYPE_UNHANDLED; \ | |
98 | } \ | |
99 | \ | |
100 | field = (typeof(field))entry; \ | |
101 | \ | |
102 | ret = trace_seq_printf(s, #call ": " print); \ | |
103 | if (!ret) \ | |
104 | return TRACE_TYPE_PARTIAL_LINE; \ | |
105 | \ | |
106 | return TRACE_TYPE_HANDLED; \ | |
107 | } | |
108 | ||
109 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) | |
110 | ||
111 | /* | |
112 | * Setup the showing format of trace point. | |
113 | * | |
114 | * int | |
115 | * ftrace_format_##call(struct trace_seq *s) | |
116 | * { | |
117 | * struct ftrace_raw_##call field; | |
118 | * int ret; | |
119 | * | |
120 | * ret = trace_seq_printf(s, #type " " #item ";" | |
121 | * " offset:%u; size:%u;\n", | |
122 | * offsetof(struct ftrace_raw_##call, item), | |
123 | * sizeof(field.type)); | |
124 | * | |
125 | * } | |
126 | */ | |
127 | ||
128 | #undef TP_STRUCT__entry | |
129 | #define TP_STRUCT__entry(args...) args | |
130 | ||
131 | #undef __field | |
132 | #define __field(type, item) \ | |
133 | ret = trace_seq_printf(s, "\tfield:" #type " " #item ";\t" \ | |
134 | "offset:%u;\tsize:%u;\n", \ | |
135 | (unsigned int)offsetof(typeof(field), item), \ | |
136 | (unsigned int)sizeof(field.item)); \ | |
137 | if (!ret) \ | |
138 | return 0; | |
139 | ||
140 | #undef __array | |
141 | #define __array(type, item, len) \ | |
142 | ret = trace_seq_printf(s, "\tfield:" #type " " #item "[" #len "];\t" \ | |
143 | "offset:%u;\tsize:%u;\n", \ | |
144 | (unsigned int)offsetof(typeof(field), item), \ | |
145 | (unsigned int)sizeof(field.item)); \ | |
146 | if (!ret) \ | |
147 | return 0; | |
148 | ||
149 | #undef __entry | |
150 | #define __entry REC | |
151 | ||
152 | #undef TP_printk | |
153 | #define TP_printk(fmt, args...) "%s, %s\n", #fmt, __stringify(args) | |
154 | ||
155 | #undef TP_fast_assign | |
156 | #define TP_fast_assign(args...) args | |
157 | ||
158 | #undef TRACE_EVENT | |
159 | #define TRACE_EVENT(call, proto, args, tstruct, func, print) \ | |
160 | static int \ | |
161 | ftrace_format_##call(struct trace_seq *s) \ | |
162 | { \ | |
76aa8111 JF |
163 | struct ftrace_raw_##call field __attribute__((unused)); \ |
164 | int ret = 0; \ | |
f42c85e7 SR |
165 | \ |
166 | tstruct; \ | |
167 | \ | |
168 | trace_seq_printf(s, "\nprint fmt: " print); \ | |
169 | \ | |
170 | return ret; \ | |
171 | } | |
172 | ||
173 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) | |
174 | ||
175 | #undef __field | |
176 | #define __field(type, item) \ | |
177 | ret = trace_define_field(event_call, #type, #item, \ | |
178 | offsetof(typeof(field), item), \ | |
179 | sizeof(field.item)); \ | |
180 | if (ret) \ | |
181 | return ret; | |
182 | ||
183 | #undef __array | |
184 | #define __array(type, item, len) \ | |
185 | BUILD_BUG_ON(len > MAX_FILTER_STR_VAL); \ | |
186 | ret = trace_define_field(event_call, #type "[" #len "]", #item, \ | |
187 | offsetof(typeof(field), item), \ | |
188 | sizeof(field.item)); \ | |
189 | if (ret) \ | |
190 | return ret; | |
191 | ||
192 | #undef TRACE_EVENT | |
193 | #define TRACE_EVENT(call, proto, args, tstruct, func, print) \ | |
194 | int \ | |
195 | ftrace_define_fields_##call(void) \ | |
196 | { \ | |
197 | struct ftrace_raw_##call field; \ | |
198 | struct ftrace_event_call *event_call = &event_##call; \ | |
199 | int ret; \ | |
200 | \ | |
7a4f453b | 201 | __common_field(int, type); \ |
f42c85e7 SR |
202 | __common_field(unsigned char, flags); \ |
203 | __common_field(unsigned char, preempt_count); \ | |
204 | __common_field(int, pid); \ | |
205 | __common_field(int, tgid); \ | |
206 | \ | |
207 | tstruct; \ | |
208 | \ | |
209 | return ret; \ | |
210 | } | |
211 | ||
212 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) | |
213 | ||
c32e827b SR |
214 | /* |
215 | * Stage 3 of the trace events. | |
216 | * | |
ea20d929 | 217 | * Override the macros in <trace/trace_events.h> to include the following: |
c32e827b SR |
218 | * |
219 | * static void ftrace_event_<call>(proto) | |
220 | * { | |
ef18012b | 221 | * event_trace_printk(_RET_IP_, "<call>: " <fmt>); |
c32e827b SR |
222 | * } |
223 | * | |
224 | * static int ftrace_reg_event_<call>(void) | |
225 | * { | |
ef18012b | 226 | * int ret; |
c32e827b | 227 | * |
ef18012b SR |
228 | * ret = register_trace_<call>(ftrace_event_<call>); |
229 | * if (!ret) | |
230 | * pr_info("event trace: Could not activate trace point " | |
231 | * "probe to <call>"); | |
232 | * return ret; | |
c32e827b SR |
233 | * } |
234 | * | |
235 | * static void ftrace_unreg_event_<call>(void) | |
236 | * { | |
ef18012b | 237 | * unregister_trace_<call>(ftrace_event_<call>); |
c32e827b SR |
238 | * } |
239 | * | |
240 | * For those macros defined with TRACE_FORMAT: | |
241 | * | |
242 | * static struct ftrace_event_call __used | |
243 | * __attribute__((__aligned__(4))) | |
244 | * __attribute__((section("_ftrace_events"))) event_<call> = { | |
ef18012b SR |
245 | * .name = "<call>", |
246 | * .regfunc = ftrace_reg_event_<call>, | |
247 | * .unregfunc = ftrace_unreg_event_<call>, | |
c32e827b SR |
248 | * } |
249 | * | |
250 | * | |
157587d7 | 251 | * For those macros defined with TRACE_EVENT: |
c32e827b SR |
252 | * |
253 | * static struct ftrace_event_call event_<call>; | |
254 | * | |
255 | * static void ftrace_raw_event_<call>(proto) | |
256 | * { | |
ef18012b SR |
257 | * struct ring_buffer_event *event; |
258 | * struct ftrace_raw_<call> *entry; <-- defined in stage 1 | |
259 | * unsigned long irq_flags; | |
260 | * int pc; | |
261 | * | |
262 | * local_save_flags(irq_flags); | |
263 | * pc = preempt_count(); | |
264 | * | |
265 | * event = trace_current_buffer_lock_reserve(event_<call>.id, | |
266 | * sizeof(struct ftrace_raw_<call>), | |
267 | * irq_flags, pc); | |
268 | * if (!event) | |
269 | * return; | |
270 | * entry = ring_buffer_event_data(event); | |
271 | * | |
272 | * <assign>; <-- Here we assign the entries by the __field and | |
0e3d0f05 | 273 | * __array macros. |
c32e827b | 274 | * |
ef18012b | 275 | * trace_current_buffer_unlock_commit(event, irq_flags, pc); |
c32e827b SR |
276 | * } |
277 | * | |
278 | * static int ftrace_raw_reg_event_<call>(void) | |
279 | * { | |
ef18012b | 280 | * int ret; |
c32e827b | 281 | * |
ef18012b SR |
282 | * ret = register_trace_<call>(ftrace_raw_event_<call>); |
283 | * if (!ret) | |
284 | * pr_info("event trace: Could not activate trace point " | |
285 | * "probe to <call>"); | |
286 | * return ret; | |
c32e827b SR |
287 | * } |
288 | * | |
289 | * static void ftrace_unreg_event_<call>(void) | |
290 | * { | |
ef18012b | 291 | * unregister_trace_<call>(ftrace_raw_event_<call>); |
c32e827b SR |
292 | * } |
293 | * | |
294 | * static struct trace_event ftrace_event_type_<call> = { | |
ef18012b | 295 | * .trace = ftrace_raw_output_<call>, <-- stage 2 |
c32e827b SR |
296 | * }; |
297 | * | |
298 | * static int ftrace_raw_init_event_<call>(void) | |
299 | * { | |
ef18012b | 300 | * int id; |
c32e827b | 301 | * |
ef18012b SR |
302 | * id = register_ftrace_event(&ftrace_event_type_<call>); |
303 | * if (!id) | |
304 | * return -ENODEV; | |
305 | * event_<call>.id = id; | |
306 | * return 0; | |
c32e827b SR |
307 | * } |
308 | * | |
309 | * static struct ftrace_event_call __used | |
310 | * __attribute__((__aligned__(4))) | |
311 | * __attribute__((section("_ftrace_events"))) event_<call> = { | |
ef18012b | 312 | * .name = "<call>", |
0e3d0f05 | 313 | * .system = "<system>", |
ef18012b SR |
314 | * .raw_init = ftrace_raw_init_event_<call>, |
315 | * .regfunc = ftrace_reg_event_<call>, | |
316 | * .unregfunc = ftrace_unreg_event_<call>, | |
981d081e | 317 | * .show_format = ftrace_format_<call>, |
c32e827b SR |
318 | * } |
319 | * | |
320 | */ | |
321 | ||
2939b046 SR |
322 | #undef TP_FMT |
323 | #define TP_FMT(fmt, args...) fmt "\n", ##args | |
c32e827b | 324 | |
ac199db0 PZ |
325 | #ifdef CONFIG_EVENT_PROFILE |
326 | #define _TRACE_PROFILE(call, proto, args) \ | |
327 | static void ftrace_profile_##call(proto) \ | |
328 | { \ | |
329 | extern void perf_tpcounter_event(int); \ | |
330 | perf_tpcounter_event(event_##call.id); \ | |
331 | } \ | |
332 | \ | |
333 | static int ftrace_profile_enable_##call(struct ftrace_event_call *call) \ | |
334 | { \ | |
335 | int ret = 0; \ | |
336 | \ | |
337 | if (!atomic_inc_return(&call->profile_count)) \ | |
338 | ret = register_trace_##call(ftrace_profile_##call); \ | |
339 | \ | |
340 | return ret; \ | |
341 | } \ | |
342 | \ | |
343 | static void ftrace_profile_disable_##call(struct ftrace_event_call *call) \ | |
344 | { \ | |
345 | if (atomic_add_negative(-1, &call->profile_count)) \ | |
346 | unregister_trace_##call(ftrace_profile_##call); \ | |
347 | } | |
348 | ||
349 | #define _TRACE_PROFILE_INIT(call) \ | |
350 | .profile_count = ATOMIC_INIT(-1), \ | |
351 | .profile_enable = ftrace_profile_enable_##call, \ | |
352 | .profile_disable = ftrace_profile_disable_##call, | |
353 | ||
354 | #else | |
355 | #define _TRACE_PROFILE(call, proto, args) | |
356 | #define _TRACE_PROFILE_INIT(call) | |
357 | #endif | |
358 | ||
c32e827b SR |
359 | #define _TRACE_FORMAT(call, proto, args, fmt) \ |
360 | static void ftrace_event_##call(proto) \ | |
361 | { \ | |
efed792d | 362 | event_trace_printk(_RET_IP_, #call ": " fmt); \ |
c32e827b SR |
363 | } \ |
364 | \ | |
365 | static int ftrace_reg_event_##call(void) \ | |
366 | { \ | |
367 | int ret; \ | |
368 | \ | |
369 | ret = register_trace_##call(ftrace_event_##call); \ | |
633ddaa7 | 370 | if (ret) \ |
c32e827b | 371 | pr_info("event trace: Could not activate trace point " \ |
633ddaa7 | 372 | "probe to " #call "\n"); \ |
c32e827b SR |
373 | return ret; \ |
374 | } \ | |
375 | \ | |
376 | static void ftrace_unreg_event_##call(void) \ | |
377 | { \ | |
378 | unregister_trace_##call(ftrace_event_##call); \ | |
379 | } \ | |
28bea271 PZ |
380 | \ |
381 | static struct ftrace_event_call event_##call; \ | |
382 | \ | |
383 | static int ftrace_init_event_##call(void) \ | |
384 | { \ | |
385 | int id; \ | |
386 | \ | |
387 | id = register_ftrace_event(NULL); \ | |
388 | if (!id) \ | |
389 | return -ENODEV; \ | |
390 | event_##call.id = id; \ | |
391 | return 0; \ | |
392 | } | |
c32e827b SR |
393 | |
394 | #undef TRACE_FORMAT | |
395 | #define TRACE_FORMAT(call, proto, args, fmt) \ | |
396 | _TRACE_FORMAT(call, PARAMS(proto), PARAMS(args), PARAMS(fmt)) \ | |
ac199db0 | 397 | _TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \ |
c32e827b SR |
398 | static struct ftrace_event_call __used \ |
399 | __attribute__((__aligned__(4))) \ | |
400 | __attribute__((section("_ftrace_events"))) event_##call = { \ | |
ef18012b | 401 | .name = #call, \ |
9cc26a26 | 402 | .system = __stringify(TRACE_SYSTEM), \ |
28bea271 | 403 | .raw_init = ftrace_init_event_##call, \ |
c32e827b SR |
404 | .regfunc = ftrace_reg_event_##call, \ |
405 | .unregfunc = ftrace_unreg_event_##call, \ | |
ac199db0 | 406 | _TRACE_PROFILE_INIT(call) \ |
c32e827b SR |
407 | } |
408 | ||
da4d0302 SR |
409 | #undef __entry |
410 | #define __entry entry | |
d20e3b03 | 411 | |
da4d0302 | 412 | #undef TRACE_EVENT |
30a8fecc | 413 | #define TRACE_EVENT(call, proto, args, tstruct, assign, print) \ |
ac199db0 | 414 | _TRACE_PROFILE(call, PARAMS(proto), PARAMS(args)) \ |
c32e827b SR |
415 | \ |
416 | static struct ftrace_event_call event_##call; \ | |
417 | \ | |
418 | static void ftrace_raw_event_##call(proto) \ | |
419 | { \ | |
7ce7e424 | 420 | struct ftrace_event_call *call = &event_##call; \ |
c32e827b SR |
421 | struct ring_buffer_event *event; \ |
422 | struct ftrace_raw_##call *entry; \ | |
423 | unsigned long irq_flags; \ | |
424 | int pc; \ | |
425 | \ | |
426 | local_save_flags(irq_flags); \ | |
427 | pc = preempt_count(); \ | |
428 | \ | |
429 | event = trace_current_buffer_lock_reserve(event_##call.id, \ | |
ef18012b | 430 | sizeof(struct ftrace_raw_##call), \ |
c32e827b SR |
431 | irq_flags, pc); \ |
432 | if (!event) \ | |
433 | return; \ | |
434 | entry = ring_buffer_event_data(event); \ | |
435 | \ | |
da4d0302 | 436 | assign; \ |
c32e827b | 437 | \ |
eb02ce01 | 438 | if (!filter_current_check_discard(call, entry, event)) \ |
77d9f465 | 439 | trace_nowake_buffer_unlock_commit(event, irq_flags, pc); \ |
c32e827b SR |
440 | } \ |
441 | \ | |
442 | static int ftrace_raw_reg_event_##call(void) \ | |
443 | { \ | |
444 | int ret; \ | |
445 | \ | |
446 | ret = register_trace_##call(ftrace_raw_event_##call); \ | |
633ddaa7 | 447 | if (ret) \ |
c32e827b | 448 | pr_info("event trace: Could not activate trace point " \ |
633ddaa7 | 449 | "probe to " #call "\n"); \ |
c32e827b SR |
450 | return ret; \ |
451 | } \ | |
452 | \ | |
453 | static void ftrace_raw_unreg_event_##call(void) \ | |
454 | { \ | |
455 | unregister_trace_##call(ftrace_raw_event_##call); \ | |
456 | } \ | |
457 | \ | |
458 | static struct trace_event ftrace_event_type_##call = { \ | |
459 | .trace = ftrace_raw_output_##call, \ | |
460 | }; \ | |
461 | \ | |
462 | static int ftrace_raw_init_event_##call(void) \ | |
463 | { \ | |
464 | int id; \ | |
465 | \ | |
466 | id = register_ftrace_event(&ftrace_event_type_##call); \ | |
467 | if (!id) \ | |
468 | return -ENODEV; \ | |
469 | event_##call.id = id; \ | |
cf027f64 | 470 | INIT_LIST_HEAD(&event_##call.fields); \ |
0a19e53c | 471 | init_preds(&event_##call); \ |
c32e827b SR |
472 | return 0; \ |
473 | } \ | |
474 | \ | |
475 | static struct ftrace_event_call __used \ | |
476 | __attribute__((__aligned__(4))) \ | |
477 | __attribute__((section("_ftrace_events"))) event_##call = { \ | |
ef18012b | 478 | .name = #call, \ |
9cc26a26 | 479 | .system = __stringify(TRACE_SYSTEM), \ |
6d723736 | 480 | .event = &ftrace_event_type_##call, \ |
c32e827b | 481 | .raw_init = ftrace_raw_init_event_##call, \ |
da4d0302 SR |
482 | .regfunc = ftrace_raw_reg_event_##call, \ |
483 | .unregfunc = ftrace_raw_unreg_event_##call, \ | |
981d081e | 484 | .show_format = ftrace_format_##call, \ |
cf027f64 | 485 | .define_fields = ftrace_define_fields_##call, \ |
ac199db0 | 486 | _TRACE_PROFILE_INIT(call) \ |
c32e827b | 487 | } |
ac199db0 | 488 | |
f42c85e7 | 489 | #include TRACE_INCLUDE(TRACE_INCLUDE_FILE) |
ac199db0 PZ |
490 | |
491 | #undef _TRACE_PROFILE | |
492 | #undef _TRACE_PROFILE_INIT | |
493 |