You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
3.8 KiB
137 lines
3.8 KiB
#ifndef _LINUX_TRACEPOINT_H
|
|
#define _LINUX_TRACEPOINT_H
|
|
|
|
/*
|
|
* Kernel Tracepoint API.
|
|
*
|
|
* See Documentation/tracepoint.txt.
|
|
*
|
|
* (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
|
|
*
|
|
* Heavily inspired from the Linux Kernel Markers.
|
|
*
|
|
* This file is released under the GPLv2.
|
|
* See the file COPYING for more details.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/rcupdate.h>
|
|
|
|
struct module;
|
|
struct tracepoint;
|
|
|
|
struct tracepoint {
|
|
const char *name; /* Tracepoint name */
|
|
int state; /* State. */
|
|
void **funcs;
|
|
} __attribute__((aligned(8)));
|
|
|
|
|
|
#define TPPROTO(args...) args
|
|
#define TPARGS(args...) args
|
|
|
|
#ifdef CONFIG_TRACEPOINTS
|
|
|
|
/*
|
|
* it_func[0] is never NULL because there is at least one element in the array
|
|
* when the array itself is non NULL.
|
|
*/
|
|
#define __DO_TRACE(tp, proto, args) \
|
|
do { \
|
|
void **it_func; \
|
|
\
|
|
rcu_read_lock_sched(); \
|
|
it_func = rcu_dereference((tp)->funcs); \
|
|
if (it_func) { \
|
|
do { \
|
|
((void(*)(proto))(*it_func))(args); \
|
|
} while (*(++it_func)); \
|
|
} \
|
|
rcu_read_unlock_sched(); \
|
|
} while (0)
|
|
|
|
/*
|
|
* Make sure the alignment of the structure in the __tracepoints section will
|
|
* not add unwanted padding between the beginning of the section and the
|
|
* structure. Force alignment to the same alignment as the section start.
|
|
*/
|
|
#define DEFINE_TRACE(name, proto, args) \
|
|
static inline void trace_##name(proto) \
|
|
{ \
|
|
static const char __tpstrtab_##name[] \
|
|
__attribute__((section("__tracepoints_strings"))) \
|
|
= #name ":" #proto; \
|
|
static struct tracepoint __tracepoint_##name \
|
|
__attribute__((section("__tracepoints"), aligned(8))) = \
|
|
{ __tpstrtab_##name, 0, NULL }; \
|
|
if (unlikely(__tracepoint_##name.state)) \
|
|
__DO_TRACE(&__tracepoint_##name, \
|
|
TPPROTO(proto), TPARGS(args)); \
|
|
} \
|
|
static inline int register_trace_##name(void (*probe)(proto)) \
|
|
{ \
|
|
return tracepoint_probe_register(#name ":" #proto, \
|
|
(void *)probe); \
|
|
} \
|
|
static inline void unregister_trace_##name(void (*probe)(proto))\
|
|
{ \
|
|
tracepoint_probe_unregister(#name ":" #proto, \
|
|
(void *)probe); \
|
|
}
|
|
|
|
extern void tracepoint_update_probe_range(struct tracepoint *begin,
|
|
struct tracepoint *end);
|
|
|
|
#else /* !CONFIG_TRACEPOINTS */
|
|
#define DEFINE_TRACE(name, proto, args) \
|
|
static inline void _do_trace_##name(struct tracepoint *tp, proto) \
|
|
{ } \
|
|
static inline void trace_##name(proto) \
|
|
{ } \
|
|
static inline int register_trace_##name(void (*probe)(proto)) \
|
|
{ \
|
|
return -ENOSYS; \
|
|
} \
|
|
static inline void unregister_trace_##name(void (*probe)(proto))\
|
|
{ }
|
|
|
|
static inline void tracepoint_update_probe_range(struct tracepoint *begin,
|
|
struct tracepoint *end)
|
|
{ }
|
|
#endif /* CONFIG_TRACEPOINTS */
|
|
|
|
/*
|
|
* Connect a probe to a tracepoint.
|
|
* Internal API, should not be used directly.
|
|
*/
|
|
extern int tracepoint_probe_register(const char *name, void *probe);
|
|
|
|
/*
|
|
* Disconnect a probe from a tracepoint.
|
|
* Internal API, should not be used directly.
|
|
*/
|
|
extern int tracepoint_probe_unregister(const char *name, void *probe);
|
|
|
|
struct tracepoint_iter {
|
|
struct module *module;
|
|
struct tracepoint *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);
|
|
|
|
/*
|
|
* tracepoint_synchronize_unregister must be called between the last tracepoint
|
|
* probe unregistration and the end of module exit to make sure there is no
|
|
* caller executing a probe when it is freed.
|
|
*/
|
|
static inline void tracepoint_synchronize_unregister(void)
|
|
{
|
|
synchronize_sched();
|
|
}
|
|
|
|
#endif
|
|
|