xref: /linux/include/trace/perf.h (revision fba2689ee77e63b05e203b3f26079ef915e55660)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 
3 #undef TRACE_SYSTEM_VAR
4 
5 #ifdef CONFIG_PERF_EVENTS
6 
7 #undef __entry
8 #define __entry entry
9 
10 #undef __get_dynamic_array
11 #define __get_dynamic_array(field)	\
12 		((void *)__entry + (__entry->__data_loc_##field & 0xffff))
13 
14 #undef __get_dynamic_array_len
15 #define __get_dynamic_array_len(field)	\
16 		((__entry->__data_loc_##field >> 16) & 0xffff)
17 
18 #undef __get_str
19 #define __get_str(field) ((char *)__get_dynamic_array(field))
20 
21 #undef __get_bitmask
22 #define __get_bitmask(field) (char *)__get_dynamic_array(field)
23 
24 #undef __get_sockaddr
25 #define __get_sockaddr(field) ((struct sockaddr *)__get_dynamic_array(field))
26 
27 #undef __get_rel_dynamic_array
28 #define __get_rel_dynamic_array(field)	\
29 		((void *)__entry +					\
30 		 offsetof(typeof(*__entry), __rel_loc_##field) +	\
31 		 sizeof(__entry->__rel_loc_##field) +			\
32 		 (__entry->__rel_loc_##field & 0xffff))
33 
34 #undef __get_rel_dynamic_array_len
35 #define __get_rel_dynamic_array_len(field)	\
36 		((__entry->__rel_loc_##field >> 16) & 0xffff)
37 
38 #undef __get_rel_str
39 #define __get_rel_str(field) ((char *)__get_rel_dynamic_array(field))
40 
41 #undef __get_rel_bitmask
42 #define __get_rel_bitmask(field) (char *)__get_rel_dynamic_array(field)
43 
44 #undef __get_rel_sockaddr
45 #define __get_rel_sockaddr(field) ((struct sockaddr *)__get_rel_dynamic_array(field))
46 
47 #undef __perf_count
48 #define __perf_count(c)	(__count = (c))
49 
50 #undef __perf_task
51 #define __perf_task(t)	(__task = (t))
52 
53 #undef DECLARE_EVENT_CLASS
54 #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
55 static notrace void							\
56 perf_trace_##call(void *__data, proto)					\
57 {									\
58 	struct trace_event_call *event_call = __data;			\
59 	struct trace_event_data_offsets_##call __maybe_unused __data_offsets;\
60 	struct trace_event_raw_##call *entry;				\
61 	struct pt_regs *__regs;						\
62 	u64 __count = 1;						\
63 	struct task_struct *__task = NULL;				\
64 	struct hlist_head *head;					\
65 	int __entry_size;						\
66 	int __data_size;						\
67 	int rctx;							\
68 									\
69 	__data_size = trace_event_get_offsets_##call(&__data_offsets, args); \
70 									\
71 	head = this_cpu_ptr(event_call->perf_events);			\
72 	if (!bpf_prog_array_valid(event_call) &&			\
73 	    __builtin_constant_p(!__task) && !__task &&			\
74 	    hlist_empty(head))						\
75 		return;							\
76 									\
77 	__entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),\
78 			     sizeof(u64));				\
79 	__entry_size -= sizeof(u32);					\
80 									\
81 	entry = perf_trace_buf_alloc(__entry_size, &__regs, &rctx);	\
82 	if (!entry)							\
83 		return;							\
84 									\
85 	perf_fetch_caller_regs(__regs);					\
86 									\
87 	tstruct								\
88 									\
89 	{ assign; }							\
90 									\
91 	perf_trace_run_bpf_submit(entry, __entry_size, rctx,		\
92 				  event_call, __count, __regs,		\
93 				  head, __task);			\
94 }
95 
96 /*
97  * This part is compiled out, it is only here as a build time check
98  * to make sure that if the tracepoint handling changes, the
99  * perf probe will fail to compile unless it too is updated.
100  */
101 #undef DEFINE_EVENT
102 #define DEFINE_EVENT(template, call, proto, args)			\
103 static inline void perf_test_probe_##call(void)				\
104 {									\
105 	check_trace_callback_type_##call(perf_trace_##template);	\
106 }
107 
108 
109 #undef DEFINE_EVENT_PRINT
110 #define DEFINE_EVENT_PRINT(template, name, proto, args, print)	\
111 	DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
112 
113 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
114 #endif /* CONFIG_PERF_EVENTS */
115