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1 | #ifndef _LINUX_TRACEPOINT_H |
2 | #define _LINUX_TRACEPOINT_H | |
3 | ||
4 | /* | |
5 | * Kernel Tracepoint API. | |
6 | * | |
7 | * See Documentation/tracepoint.txt. | |
8 | * | |
9 | * (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
10 | * | |
11 | * Heavily inspired from the Linux Kernel Markers. | |
12 | * | |
13 | * This file is released under the GPLv2. | |
14 | * See the file COPYING for more details. | |
15 | */ | |
16 | ||
474d745f PMF |
17 | //#include <linux/immediate.h> |
18 | //#include <linux/types.h> | |
19 | //#include <linux/rcupdate.h> | |
20 | ||
21 | #include "immediate.h" | |
22 | #include "kernelcompat.h" | |
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23 | |
24 | struct module; | |
25 | struct tracepoint; | |
26 | ||
27 | struct tracepoint { | |
28 | const char *name; /* Tracepoint name */ | |
29 | DEFINE_IMV(char, state); /* State. */ | |
30 | void **funcs; | |
31 | } __attribute__((aligned(32))); /* | |
32 | * Aligned on 32 bytes because it is | |
33 | * globally visible and gcc happily | |
34 | * align these on the structure size. | |
35 | * Keep in sync with vmlinux.lds.h. | |
36 | */ | |
37 | ||
38 | #define TPPROTO(args...) args | |
39 | #define TPARGS(args...) args | |
40 | ||
474d745f | 41 | //ust// #ifdef CONFIG_TRACEPOINTS |
f99be407 PMF |
42 | |
43 | /* | |
44 | * it_func[0] is never NULL because there is at least one element in the array | |
45 | * when the array itself is non NULL. | |
46 | */ | |
47 | #define __DO_TRACE(tp, proto, args) \ | |
48 | do { \ | |
49 | void **it_func; \ | |
50 | \ | |
51 | rcu_read_lock_sched_notrace(); \ | |
52 | it_func = rcu_dereference((tp)->funcs); \ | |
53 | if (it_func) { \ | |
54 | do { \ | |
55 | ((void(*)(proto))(*it_func))(args); \ | |
56 | } while (*(++it_func)); \ | |
57 | } \ | |
58 | rcu_read_unlock_sched_notrace(); \ | |
59 | } while (0) | |
60 | ||
61 | #define __CHECK_TRACE(name, generic, proto, args) \ | |
62 | do { \ | |
63 | if (!generic) { \ | |
64 | if (unlikely(imv_read(__tracepoint_##name.state))) \ | |
65 | __DO_TRACE(&__tracepoint_##name, \ | |
66 | TPPROTO(proto), TPARGS(args)); \ | |
67 | } else { \ | |
68 | if (unlikely(_imv_read(__tracepoint_##name.state))) \ | |
69 | __DO_TRACE(&__tracepoint_##name, \ | |
70 | TPPROTO(proto), TPARGS(args)); \ | |
71 | } \ | |
72 | } while (0) | |
73 | ||
74 | /* | |
75 | * Make sure the alignment of the structure in the __tracepoints section will | |
76 | * not add unwanted padding between the beginning of the section and the | |
77 | * structure. Force alignment to the same alignment as the section start. | |
78 | * | |
79 | * The "generic" argument, passed to the declared __trace_##name inline | |
80 | * function controls which tracepoint enabling mechanism must be used. | |
81 | * If generic is true, a variable read is used. | |
82 | * If generic is false, immediate values are used. | |
83 | */ | |
84 | #define DECLARE_TRACE(name, proto, args) \ | |
85 | extern struct tracepoint __tracepoint_##name; \ | |
86 | static inline void trace_##name(proto) \ | |
87 | { \ | |
88 | __CHECK_TRACE(name, 0, TPPROTO(proto), TPARGS(args)); \ | |
89 | } \ | |
90 | static inline void _trace_##name(proto) \ | |
91 | { \ | |
92 | __CHECK_TRACE(name, 1, TPPROTO(proto), TPARGS(args)); \ | |
93 | } \ | |
94 | static inline int register_trace_##name(void (*probe)(proto)) \ | |
95 | { \ | |
96 | return tracepoint_probe_register(#name, (void *)probe); \ | |
97 | } \ | |
98 | static inline int unregister_trace_##name(void (*probe)(proto)) \ | |
99 | { \ | |
100 | return tracepoint_probe_unregister(#name, (void *)probe);\ | |
101 | } | |
102 | ||
103 | #define DEFINE_TRACE(name) \ | |
104 | static const char __tpstrtab_##name[] \ | |
105 | __attribute__((section("__tracepoints_strings"))) = #name; \ | |
106 | struct tracepoint __tracepoint_##name \ | |
107 | __attribute__((section("__tracepoints"), aligned(32))) = \ | |
108 | { __tpstrtab_##name, 0, NULL } | |
109 | ||
110 | #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \ | |
111 | EXPORT_SYMBOL_GPL(__tracepoint_##name) | |
112 | #define EXPORT_TRACEPOINT_SYMBOL(name) \ | |
113 | EXPORT_SYMBOL(__tracepoint_##name) | |
114 | ||
115 | extern void tracepoint_update_probe_range(struct tracepoint *begin, | |
116 | struct tracepoint *end); | |
117 | ||
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118 | //ust// #else /* !CONFIG_TRACEPOINTS */ |
119 | //ust// #define DECLARE_TRACE(name, proto, args) \ | |
120 | //ust// static inline void trace_##name(proto) \ | |
121 | //ust// { } \ | |
122 | //ust// static inline void _trace_##name(proto) \ | |
123 | //ust// { } \ | |
124 | //ust// static inline int register_trace_##name(void (*probe)(proto)) \ | |
125 | //ust// { \ | |
126 | //ust// return -ENOSYS; \ | |
127 | //ust// } \ | |
128 | //ust// static inline int unregister_trace_##name(void (*probe)(proto)) \ | |
129 | //ust// { \ | |
130 | //ust// return -ENOSYS; \ | |
131 | //ust// } | |
132 | //ust// | |
133 | //ust// #define DEFINE_TRACE(name) | |
134 | //ust// #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) | |
135 | //ust// #define EXPORT_TRACEPOINT_SYMBOL(name) | |
136 | //ust// | |
137 | //ust// static inline void tracepoint_update_probe_range(struct tracepoint *begin, | |
138 | //ust// struct tracepoint *end) | |
139 | //ust// { } | |
140 | //ust// #endif /* CONFIG_TRACEPOINTS */ | |
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141 | |
142 | /* | |
143 | * Connect a probe to a tracepoint. | |
144 | * Internal API, should not be used directly. | |
145 | */ | |
146 | extern int tracepoint_probe_register(const char *name, void *probe); | |
147 | ||
148 | /* | |
149 | * Disconnect a probe from a tracepoint. | |
150 | * Internal API, should not be used directly. | |
151 | */ | |
152 | extern int tracepoint_probe_unregister(const char *name, void *probe); | |
153 | ||
154 | extern int tracepoint_probe_register_noupdate(const char *name, void *probe); | |
155 | extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe); | |
156 | extern void tracepoint_probe_update_all(void); | |
157 | ||
158 | struct tracepoint_iter { | |
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159 | //ust// struct module *module; |
160 | struct tracepoint_lib *lib; | |
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161 | struct tracepoint *tracepoint; |
162 | }; | |
163 | ||
164 | extern void tracepoint_iter_start(struct tracepoint_iter *iter); | |
165 | extern void tracepoint_iter_next(struct tracepoint_iter *iter); | |
166 | extern void tracepoint_iter_stop(struct tracepoint_iter *iter); | |
167 | extern void tracepoint_iter_reset(struct tracepoint_iter *iter); | |
168 | extern int tracepoint_get_iter_range(struct tracepoint **tracepoint, | |
169 | struct tracepoint *begin, struct tracepoint *end); | |
170 | ||
171 | /* | |
172 | * tracepoint_synchronize_unregister must be called between the last tracepoint | |
173 | * probe unregistration and the end of module exit to make sure there is no | |
174 | * caller executing a probe when it is freed. | |
175 | */ | |
176 | static inline void tracepoint_synchronize_unregister(void) | |
177 | { | |
178 | synchronize_sched(); | |
179 | } | |
180 | ||
474d745f PMF |
181 | struct tracepoint_lib { |
182 | struct tracepoint *tracepoints_start; | |
183 | int tracepoints_count; | |
184 | struct list_head list; | |
185 | }; | |
186 | ||
187 | #define TRACEPOINT_LIB \ | |
188 | extern struct tracepoint __start___tracepoints[] __attribute__((visibility("hidden"))); \ | |
189 | extern struct tracepoint __stop___tracepoints[] __attribute__((visibility("hidden"))); \ | |
190 | \ | |
191 | static void __attribute__((constructor)) __tracepoints__init(void) \ | |
192 | { \ | |
193 | tracepoint_register_lib(__start___tracepoints, (((long)__stop___tracepoints)-((long)__start___tracepoints))/sizeof(struct tracepoint));\ | |
194 | } | |
f99be407 | 195 | #endif |