const char *name; /* Tracepoint name */
DEFINE_IMV(char, state); /* State. */
struct probe *probes;
-} __attribute__((aligned(32))); /*
- * Aligned on 32 bytes because it is
- * globally visible and gcc happily
- * align these on the structure size.
- * Keep in sync with vmlinux.lds.h.
- */
+};
#define PARAMS(args...) args
#define TP_PROTO(args...) args
#define TP_ARGS(args...) args
+/*
+ * Tracepoints should be added to the instrumented code using the
+ * "tracepoint()" macro.
+ */
+#define tracepoint(name, args...) __trace_##name(args)
+
+#define register_tracepoint(name, probe, data) \
+ __register_trace_##name(probe, data)
+
+#define unregister_tracepoint(name, probe, data) \
+ __unregister_trace_##name(probe, data)
+
#define CONFIG_TRACEPOINTS
#ifdef CONFIG_TRACEPOINTS
*/
#define __DECLARE_TRACE(name, proto, args, data_proto, data_args) \
extern struct tracepoint __tracepoint_##name; \
- static inline void trace_##name(proto) \
+ static inline void __trace_##name(proto) \
{ \
__CHECK_TRACE(name, 0, TP_PROTO(data_proto), \
TP_ARGS(data_args)); \
TP_ARGS(data_args)); \
} \
static inline int \
- register_trace_##name(void (*probe)(data_proto), void *data) \
+ __register_trace_##name(void (*probe)(data_proto), void *data) \
{ \
return tracepoint_probe_register(#name, (void *)probe, \
data); \
\
} \
static inline int \
- unregister_trace_##name(void (*probe)(data_proto), void *data) \
+ __unregister_trace_##name(void (*probe)(data_proto), void *data)\
{ \
return tracepoint_probe_unregister(#name, (void *)probe, \
data); \
}
-#define DEFINE_TRACE_FN(name, reg, unreg) \
+#define DEFINE_TRACE_FN(name, reg, unreg) \
static const char __tpstrtab_##name[] \
__attribute__((section("__tracepoints_strings"))) = #name; \
struct tracepoint __tracepoint_##name \
- __attribute__((section("__tracepoints"), aligned(32))) = \
- { __tpstrtab_##name, 0, NULL }
+ __attribute__((section("__tracepoints"))) = \
+ { __tpstrtab_##name, 0, NULL }; \
+ static struct tracepoint * const __tracepoint_ptr_##name \
+ __attribute__((used, section("__tracepoints_ptrs"))) = \
+ &__tracepoint_##name;
#define DEFINE_TRACE(name) \
- DEFINE_TRACE_FN(name, NULL, NULL);
+ DEFINE_TRACE_FN(name, NULL, NULL)
-extern void tracepoint_update_probe_range(struct tracepoint *begin,
- struct tracepoint *end);
+extern void tracepoint_update_probe_range(struct tracepoint * const *begin,
+ struct tracepoint * const *end);
#else /* !CONFIG_TRACEPOINTS */
#define __DECLARE_TRACE(name, proto, args) \
{ } \
static inline void _trace_##name(proto) \
{ } \
- static inline int register_trace_##name(void (*probe)(proto)) \
+ static inline int __register_trace_##name(void (*probe)(proto), void *data) \
{ \
return -ENOSYS; \
} \
- static inline int unregister_trace_##name(void (*probe)(proto)) \
+ static inline int __unregister_trace_##name(void (*probe)(proto), void *data) \
{ \
return -ENOSYS; \
}
{ }
#endif /* CONFIG_TRACEPOINTS */
-#define DECLARE_TRACE(name, proto, args) \
- __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
- PARAMS(void *__data, proto), \
- PARAMS(__data, args))
+/*
+ * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
+ * (void). "void" is a special value in a function prototype and can
+ * not be combined with other arguments. Since the DECLARE_TRACE()
+ * macro adds a data element at the beginning of the prototype,
+ * we need a way to differentiate "(void *data, proto)" from
+ * "(void *data, void)". The second prototype is invalid.
+ *
+ * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
+ * and "void *__data" as the callback prototype.
+ *
+ * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
+ * "void *__data, proto" as the callback prototype.
+ */
+#define DECLARE_TRACE_NOARGS(name) \
+ __DECLARE_TRACE(name, void, , void *__data, __data)
+
+#define DECLARE_TRACE(name, proto, args) \
+ __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \
+ PARAMS(void *__data, proto), \
+ PARAMS(__data, args))
/*
* Connect a probe to a tracepoint.
struct tracepoint_iter {
//ust// struct module *module;
struct tracepoint_lib *lib;
- struct tracepoint *tracepoint;
+ struct tracepoint * const *tracepoint;
};
extern void tracepoint_iter_start(struct tracepoint_iter *iter);
extern void tracepoint_iter_next(struct tracepoint_iter *iter);
extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
-extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
- struct tracepoint *begin, struct tracepoint *end);
+extern int tracepoint_get_iter_range(struct tracepoint * const **tracepoint,
+ struct tracepoint * const *begin, struct tracepoint * const *end);
/*
* tracepoint_synchronize_unregister must be called between the last tracepoint
}
struct tracepoint_lib {
- struct tracepoint *tracepoints_start;
+ struct tracepoint * const *tracepoints_start;
int tracepoints_count;
- struct list_head list;
+ struct cds_list_head list;
};
-extern int tracepoint_register_lib(struct tracepoint *tracepoints_start,
+extern int tracepoint_register_lib(struct tracepoint * const *tracepoints_start,
int tracepoints_count);
-extern int tracepoint_unregister_lib(struct tracepoint *tracepoints_start);
+extern int tracepoint_unregister_lib(struct tracepoint * const *tracepoints_start);
#define TRACEPOINT_LIB \
- extern struct tracepoint __start___tracepoints[] __attribute__((weak, visibility("hidden"))); \
- extern struct tracepoint __stop___tracepoints[] __attribute__((weak, visibility("hidden"))); \
- static void __attribute__((constructor)) __tracepoints__init(void) \
- { \
- tracepoint_register_lib(__start___tracepoints, \
- (((long)__stop___tracepoints)-((long)__start___tracepoints))/sizeof(struct tracepoint)); \
- } \
- \
- static void __attribute__((destructor)) __tracepoints__destroy(void) \
- { \
- tracepoint_unregister_lib(__start___tracepoints); \
+ extern struct tracepoint * const __start___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
+ extern struct tracepoint * const __stop___tracepoints_ptrs[] __attribute__((weak, visibility("hidden"))); \
+ static struct tracepoint * const __tracepoint_ptr_dummy \
+ __attribute__((used, section("__tracepoints_ptrs"))) = NULL; \
+ static void __attribute__((constructor)) __tracepoints__init(void) \
+ { \
+ tracepoint_register_lib(__start___tracepoints_ptrs, \
+ __stop___tracepoints_ptrs - \
+ __start___tracepoints_ptrs); \
+ } \
+ \
+ static void __attribute__((destructor)) __tracepoints__destroy(void) \
+ { \
+ tracepoint_unregister_lib(__start___tracepoints_ptrs); \
}
* TRACE_EVENT_FN to perform any (un)registration work.
*/
+struct trace_event {
+ const char *name;
+ int (*regfunc)(void *data);
+ int (*unregfunc)(void *data);
+};
+
+struct trace_event_lib {
+ struct trace_event * const *trace_events_start;
+ int trace_events_count;
+ struct cds_list_head list;
+};
+
+struct trace_event_iter {
+ struct trace_event_lib *lib;
+ struct trace_event * const *trace_event;
+};
+
+extern void lock_trace_events(void);
+extern void unlock_trace_events(void);
+
+extern void trace_event_iter_start(struct trace_event_iter *iter);
+extern void trace_event_iter_next(struct trace_event_iter *iter);
+extern void trace_event_iter_reset(struct trace_event_iter *iter);
+
+extern int trace_event_get_iter_range(struct trace_event * const **trace_event,
+ struct trace_event * const *begin,
+ struct trace_event * const *end);
+
+extern void trace_event_update_process(void);
+extern int is_trace_event_enabled(const char *channel, const char *name);
+
+extern int trace_event_register_lib(struct trace_event * const *start_trace_events,
+ int trace_event_count);
+
+extern int trace_event_unregister_lib(struct trace_event * const *start_trace_events);
+
+#define TRACE_EVENT_LIB \
+ extern struct trace_event * const __start___trace_events_ptrs[] \
+ __attribute__((weak, visibility("hidden"))); \
+ extern struct trace_event * const __stop___trace_events_ptrs[] \
+ __attribute__((weak, visibility("hidden"))); \
+ static struct trace_event * const __event_ptrs_dummy \
+ __attribute__((used, section("__trace_events_ptrs"))) = NULL; \
+ static void __attribute__((constructor)) \
+ __trace_events__init(void) \
+ { \
+ trace_event_register_lib(__start___trace_events_ptrs, \
+ __stop___trace_events_ptrs - \
+ __start___trace_events_ptrs); \
+ } \
+ \
+ static void __attribute__((destructor)) \
+ __trace_event__destroy(void) \
+ { \
+ trace_event_unregister_lib(__start___trace_events_ptrs);\
+ }
+
#define DECLARE_TRACE_EVENT_CLASS(name, proto, args, tstruct, assign, print)
#define DEFINE_TRACE_EVENT(template, name, proto, args) \
DECLARE_TRACE(name, PARAMS(proto), PARAMS(args))
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