tracepoints: Implement it with dynamic functions
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 041f7e5..46677f3 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -21,6 +21,7 @@
#include <linux/cpumask.h>
#include <linux/rcupdate.h>
#include <linux/tracepoint-defs.h>
+#include <linux/jump_function.h>
struct module;
struct tracepoint;
@@ -94,7 +95,9 @@ extern int syscall_regfunc(void);
extern void syscall_unregfunc(void);
#endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
+#ifndef PARAMS
#define PARAMS(args...) args
+#endif
#define TRACE_DEFINE_ENUM(x)
#define TRACE_DEFINE_SIZEOF(x)
@@ -138,12 +141,11 @@ extern void syscall_unregfunc(void);
* as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
* "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
*/
-#define __DO_TRACE(tp, proto, args, cond, rcuidle) \
+#define __DO_TRACE(name, proto, args, cond, rcuidle) \
do { \
struct tracepoint_func *it_func_ptr; \
- void *it_func; \
- void *__data; \
int __maybe_unused idx = 0; \
+ void *__data; \
\
if (!(cond)) \
return; \
@@ -163,14 +165,11 @@ extern void syscall_unregfunc(void);
rcu_irq_enter_irqson(); \
} \
\
- it_func_ptr = rcu_dereference_raw((tp)->funcs); \
- \
+ it_func_ptr = \
+ rcu_dereference_raw((&__tracepoint_##name)->funcs); \
if (it_func_ptr) { \
- do { \
- it_func = (it_func_ptr)->func; \
- __data = (it_func_ptr)->data; \
- ((void(*)(proto))(it_func))(args); \
- } while ((++it_func_ptr)->func); \
+ __data = (it_func_ptr)->data; \
+ dynfunc_tp_func_##name(args); \
} \
\
if (rcuidle) { \
@@ -186,7 +185,7 @@ extern void syscall_unregfunc(void);
static inline void trace_##name##_rcuidle(proto) \
{ \
if (static_key_false(&__tracepoint_##name.key)) \
- __DO_TRACE(&__tracepoint_##name, \
+ __DO_TRACE(name, \
TP_PROTO(data_proto), \
TP_ARGS(data_args), \
TP_CONDITION(cond), 1); \
@@ -208,11 +207,13 @@ extern void syscall_unregfunc(void);
* poking RCU a bit.
*/
#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
+ DECLARE_DYNAMIC_FUNCTION(tp_func_##name, PARAMS(data_proto), \
+ PARAMS(data_args)); \
extern struct tracepoint __tracepoint_##name; \
static inline void trace_##name(proto) \
{ \
if (static_key_false(&__tracepoint_##name.key)) \
- __DO_TRACE(&__tracepoint_##name, \
+ __DO_TRACE(name, \
TP_PROTO(data_proto), \
TP_ARGS(data_args), \
TP_CONDITION(cond), 0); \
@@ -271,21 +272,42 @@ extern void syscall_unregfunc(void);
* structures, so we create an array of pointers that will be used for iteration
* on the tracepoints.
*/
-#define DEFINE_TRACE_FN(name, reg, unreg) \
+#define DEFINE_TRACE_FN(name, reg, unreg, proto, args) \
static const char __tpstrtab_##name[] \
__attribute__((section("__tracepoints_strings"))) = #name; \
struct tracepoint __tracepoint_##name \
__attribute__((section("__tracepoints"), used)) = \
{ __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
- __TRACEPOINT_ENTRY(name);
+ __TRACEPOINT_ENTRY(name); \
+ int __tracepoint_iter_##name(void *__data, proto) \
+ { \
+ struct tracepoint_func *it_func_ptr; \
+ void *it_func; \
+ \
+ it_func_ptr = \
+ rcu_dereference_raw((&__tracepoint_##name)->funcs); \
+ do { \
+ it_func = (it_func_ptr)->func; \
+ __data = (it_func_ptr)->data; \
+ ((void(*)(void *, proto))(it_func))(__data, args); \
+ } while ((++it_func_ptr)->func); \
+ return 0; \
+ } \
+ DEFINE_DYNAMIC_FUNCTION(tp_func_##name, __tracepoint_iter_##name, \
+ PARAMS(void *__data, proto))
-#define DEFINE_TRACE(name) \
- DEFINE_TRACE_FN(name, NULL, NULL);
+#define DEFINE_TRACE(name, proto, args) \
+ DEFINE_TRACE_FN(name, NULL, NULL, PARAMS(proto), PARAMS(args));
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \
- EXPORT_SYMBOL_GPL(__tracepoint_##name)
+ EXPORT_SYMBOL_GPL(__tracepoint_##name); \
+ EXPORT_SYMBOL_GPL(___dyn_func__tp_func_##name); \
+ EXPORT_SYMBOL_GPL(___dyn_func__tp_func_##name##__func)
#define EXPORT_TRACEPOINT_SYMBOL(name) \
- EXPORT_SYMBOL(__tracepoint_##name)
+ EXPORT_SYMBOL(__tracepoint_##name); \
+ EXPORT_SYMBOL(___dyn_func__tp_func_##name); \
+ EXPORT_SYMBOL(___dyn_func__tp_func_##name##__func)
+
#else /* !TRACEPOINTS_ENABLED */
#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
@@ -314,8 +336,8 @@ extern void syscall_unregfunc(void);
return false; \
}
-#define DEFINE_TRACE_FN(name, reg, unreg)
-#define DEFINE_TRACE(name)
+#define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
+#define DEFINE_TRACE(name, proto, args)
#define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
#define EXPORT_TRACEPOINT_SYMBOL(name)
diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h
index cb30c55..c19aea4 100644
--- a/include/trace/define_trace.h
+++ b/include/trace/define_trace.h
@@ -25,7 +25,7 @@
#undef TRACE_EVENT
#define TRACE_EVENT(name, proto, args, tstruct, assign, print) \
- DEFINE_TRACE(name)
+ DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
#undef TRACE_EVENT_CONDITION
#define TRACE_EVENT_CONDITION(name, proto, args, cond, tstruct, assign, print) \
@@ -39,24 +39,24 @@
#undef TRACE_EVENT_FN
#define TRACE_EVENT_FN(name, proto, args, tstruct, \
assign, print, reg, unreg) \
- DEFINE_TRACE_FN(name, reg, unreg)
+ DEFINE_TRACE_FN(name, reg, unreg, PARAMS(proto), PARAMS(args))
#undef TRACE_EVENT_FN_COND
#define TRACE_EVENT_FN_COND(name, proto, args, cond, tstruct, \
assign, print, reg, unreg) \
- DEFINE_TRACE_FN(name, reg, unreg)
+ DEFINE_TRACE_FN(name, reg, unreg, PARAMS(proto), PARAMS(args))
#undef DEFINE_EVENT
#define DEFINE_EVENT(template, name, proto, args) \
- DEFINE_TRACE(name)
+ DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
#undef DEFINE_EVENT_FN
#define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg) \
- DEFINE_TRACE_FN(name, reg, unreg)
+ DEFINE_TRACE_FN(name, reg, unreg, PARAMS(proto), PARAMS(args))
#undef DEFINE_EVENT_PRINT
#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
- DEFINE_TRACE(name)
+ DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
#undef DEFINE_EVENT_CONDITION
#define DEFINE_EVENT_CONDITION(template, name, proto, args, cond) \
@@ -64,7 +64,7 @@
#undef DECLARE_TRACE
#define DECLARE_TRACE(name, proto, args) \
- DEFINE_TRACE(name)
+ DEFINE_TRACE(name, PARAMS(proto), PARAMS(args))
#undef TRACE_INCLUDE
#undef __TRACE_INCLUDE
