ftrace.h 21 KB

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