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2024-02-19 1c055e55a242a33e574e48be530e06770a210dcd

 kernel/include/linux/tracepoint.h
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@@ -1,3 +1,4 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 #ifndef _LINUX_TRACEPOINT_H
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 #define _LINUX_TRACEPOINT_H
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@@ -9,9 +10,6 @@
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  * Copyright (C) 2008-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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  *
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  * Heavily inspired from the Linux Kernel Markers.
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- *
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- * This file is released under the GPLv2.
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- * See the file COPYING for more details.
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  */
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14
 
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 #include <linux/smp.h>
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@@ -21,6 +19,7 @@
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 #include <linux/cpumask.h>
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 #include <linux/rcupdate.h>
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 #include <linux/tracepoint-defs.h>
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+#include <linux/static_call.h>
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23
 
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 struct module;
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 struct tracepoint;
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@@ -92,7 +91,7 @@
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 static inline void tracepoint_synchronize_unregister(void)
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 {
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 	synchronize_srcu(&tracepoint_srcu);
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-	synchronize_sched();
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+	synchronize_rcu();
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 }
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 #else
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 static inline void tracepoint_synchronize_unregister(void)
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@@ -104,7 +103,9 @@
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 extern void syscall_unregfunc(void);
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 #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */
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+#ifndef PARAMS
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 #define PARAMS(args...) args
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+#endif
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 #define TRACE_DEFINE_ENUM(x)
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 #define TRACE_DEFINE_SIZEOF(x)
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@@ -128,8 +129,7 @@
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 #define __TRACEPOINT_ENTRY(name)					 \
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 	static tracepoint_ptr_t __tracepoint_ptr_##name __used		 \
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-	__attribute__((section("__tracepoints_ptrs"))) =		 \
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-		&__tracepoint_##name
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+	__section("__tracepoints_ptrs") = &__tracepoint_##name
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 #endif
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 #endif /* _LINUX_TRACEPOINT_H */
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@@ -161,6 +161,12 @@
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161
 
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 #ifdef TRACEPOINTS_ENABLED
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+#ifdef CONFIG_HAVE_STATIC_CALL
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+#define __DO_TRACE_CALL(name)	static_call(tp_func_##name)
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+#else
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+#define __DO_TRACE_CALL(name)	__traceiter_##name
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+#endif /* CONFIG_HAVE_STATIC_CALL */
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+
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 /*
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  * it_func[0] is never NULL because there is at least one element in the array
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  * when the array itself is non NULL.
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@@ -168,15 +174,13 @@
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  * Note, the proto and args passed in includes "__data" as the first parameter.
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  * The reason for this is to handle the "void" prototype. If a tracepoint
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  * has a "void" prototype, then it is invalid to declare a function
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- * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just
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- * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto".
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+ * as "(void *, void)".
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  */
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-#define __DO_TRACE(tp, proto, args, cond, rcuidle)			\
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+#define __DO_TRACE(name, proto, args, cond, rcuidle)			\
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 	do {								\
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 		struct tracepoint_func *it_func_ptr;			\
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-		void *it_func;						\
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-		void *__data;						\
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 		int __maybe_unused __idx = 0;				\
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+		void *__data;						\
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 									\
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 		if (!(cond))						\
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 			return;						\
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@@ -196,14 +200,11 @@
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 			rcu_irq_enter_irqson();				\
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 		}							\
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 									\
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-		it_func_ptr = rcu_dereference_raw((tp)->funcs);		\
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-									\
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+		it_func_ptr =						\
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+			rcu_dereference_raw((&__tracepoint_##name)->funcs); \
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 		if (it_func_ptr) {					\
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-			do {						\
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-				it_func = (it_func_ptr)->func;		\
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-				__data = (it_func_ptr)->data;		\
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-				((void(*)(proto))(it_func))(args);	\
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-			} while ((++it_func_ptr)->func);		\
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+			__data = (it_func_ptr)->data;			\
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+			__DO_TRACE_CALL(name)(args);			\
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 		}							\
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 									\
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 		if (rcuidle) {						\
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@@ -219,7 +220,7 @@
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 	static inline void trace_##name##_rcuidle(proto)		\
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 	{								\
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 		if (static_key_false(&__tracepoint_##name.key))		\
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-			__DO_TRACE(&__tracepoint_##name,		\
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+			__DO_TRACE(name,				\
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 				TP_PROTO(data_proto),			\
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 				TP_ARGS(data_args),			\
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 				TP_CONDITION(cond), 1);			\
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@@ -233,26 +234,25 @@
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  * not add unwanted padding between the beginning of the section and the
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  * structure. Force alignment to the same alignment as the section start.
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  *
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- * When lockdep is enabled, we make sure to always do the RCU portions of
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- * the tracepoint code, regardless of whether tracing is on. However,
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- * don't check if the condition is false, due to interaction with idle
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- * instrumentation. This lets us find RCU issues triggered with tracepoints
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- * even when this tracepoint is off. This code has no purpose other than
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- * poking RCU a bit.
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+ * When lockdep is enabled, we make sure to always test if RCU is
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+ * "watching" regardless if the tracepoint is enabled or not. Tracepoints
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+ * require RCU to be active, and it should always warn at the tracepoint
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+ * site if it is not watching, as it will need to be active when the
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+ * tracepoint is enabled.
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  */
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 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
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+	extern int __traceiter_##name(data_proto);			\
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+	DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name);	\
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 	extern struct tracepoint __tracepoint_##name;			\
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-	static inline void trace_##name(proto)				\
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+	static inline void __nocfi trace_##name(proto)				\
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 	{								\
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 		if (static_key_false(&__tracepoint_##name.key))		\
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-			__DO_TRACE(&__tracepoint_##name,		\
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+			__DO_TRACE(name,				\
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 				TP_PROTO(data_proto),			\
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 				TP_ARGS(data_args),			\
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 				TP_CONDITION(cond), 0);			\
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 		if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {		\
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-			rcu_read_lock_sched_notrace();			\
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-			rcu_dereference_sched(__tracepoint_##name.funcs);\
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-			rcu_read_unlock_sched_notrace();		\
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+			WARN_ON_ONCE(!rcu_is_watching());		\
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 		}							\
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 	}								\
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 	__DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args),		\
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@@ -291,21 +291,52 @@
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  * structures, so we create an array of pointers that will be used for iteration
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  * on the tracepoints.
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  */
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-#define DEFINE_TRACE_FN(name, reg, unreg)				 \
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-	static const char __tpstrtab_##name[]				 \
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-	__attribute__((section("__tracepoints_strings"))) = #name;	 \
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-	struct tracepoint __tracepoint_##name				 \
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-	__attribute__((section("__tracepoints"), used)) =		 \
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-		{ __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\
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-	__TRACEPOINT_ENTRY(name);
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+#define DEFINE_TRACE_FN(_name, _reg, _unreg, proto, args)		\
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+	static const char __tpstrtab_##_name[]				\
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+	__section("__tracepoints_strings") = #_name;			\
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+	extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name);	\
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+	int __traceiter_##_name(void *__data, proto);			\
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+	struct tracepoint __tracepoint_##_name	__used			\
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+	__section("__tracepoints") = {					\
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+		.name = __tpstrtab_##_name,				\
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+		.key = STATIC_KEY_INIT_FALSE,				\
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+		.static_call_key = &STATIC_CALL_KEY(tp_func_##_name),	\
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+		.static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \
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+		.iterator = &__traceiter_##_name,			\
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+		.regfunc = _reg,					\
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+		.unregfunc = _unreg,					\
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+		.funcs = NULL };					\
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+	__TRACEPOINT_ENTRY(_name);					\
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+	int __nocfi __traceiter_##_name(void *__data, proto)			\
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+	{								\
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+		struct tracepoint_func *it_func_ptr;			\
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+		void *it_func;						\
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+									\
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+		it_func_ptr =						\
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+			rcu_dereference_raw((&__tracepoint_##_name)->funcs); \
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+		if (it_func_ptr) {					\
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+			do {						\
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+				it_func = (it_func_ptr)->func;		\
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+				__data = (it_func_ptr)->data;		\
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+				((void(*)(void *, proto))(it_func))(__data, args); \
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+			} while ((++it_func_ptr)->func);		\
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+		}							\
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+		return 0;						\
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+	}								\
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+	DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name);
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-#define DEFINE_TRACE(name)						\
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-	DEFINE_TRACE_FN(name, NULL, NULL);
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+#define DEFINE_TRACE(name, proto, args)		\
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+	DEFINE_TRACE_FN(name, NULL, NULL, PARAMS(proto), PARAMS(args));
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 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)				\
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-	EXPORT_SYMBOL_GPL(__tracepoint_##name)
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+	EXPORT_SYMBOL_GPL(__tracepoint_##name);				\
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+	EXPORT_SYMBOL_GPL(__traceiter_##name);				\
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+	EXPORT_STATIC_CALL_GPL(tp_func_##name)
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 #define EXPORT_TRACEPOINT_SYMBOL(name)					\
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-	EXPORT_SYMBOL(__tracepoint_##name)
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+	EXPORT_SYMBOL(__tracepoint_##name);				\
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+	EXPORT_SYMBOL(__traceiter_##name);				\
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+	EXPORT_STATIC_CALL(tp_func_##name)
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+
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 #else /* !TRACEPOINTS_ENABLED */
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 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
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@@ -334,8 +365,8 @@
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 		return false;						\
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 	}
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-#define DEFINE_TRACE_FN(name, reg, unreg)
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-#define DEFINE_TRACE(name)
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+#define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
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+#define DEFINE_TRACE(name, proto, args)
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 #define EXPORT_TRACEPOINT_SYMBOL_GPL(name)
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 #define EXPORT_TRACEPOINT_SYMBOL(name)
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@@ -374,7 +405,7 @@
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 		static const char *___tp_str __tracepoint_string = str; \
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 		___tp_str;						\
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 	})
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-#define __tracepoint_string	__attribute__((section("__tracepoint_str"), used))
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+#define __tracepoint_string	__used __section("__tracepoint_str")
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 #else
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 /*
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  * tracepoint_string() is used to save the string address for userspace
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@@ -384,25 +415,6 @@
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 # define tracepoint_string(str) str
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 # define __tracepoint_string
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 #endif
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-
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-/*
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- * The need for the DECLARE_TRACE_NOARGS() is to handle the prototype
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- * (void). "void" is a special value in a function prototype and can
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- * not be combined with other arguments. Since the DECLARE_TRACE()
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- * macro adds a data element at the beginning of the prototype,
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- * we need a way to differentiate "(void *data, proto)" from
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- * "(void *data, void)". The second prototype is invalid.
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- *
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- * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype
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- * and "void *__data" as the callback prototype.
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- *
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- * DECLARE_TRACE() passes "proto" as the tracepoint protoype and
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- * "void *__data, proto" as the callback prototype.
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- */
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-#define DECLARE_TRACE_NOARGS(name)					\
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-	__DECLARE_TRACE(name, void, ,					\
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-			cpu_online(raw_smp_processor_id()),		\
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-			void *__data, __data)
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 #define DECLARE_TRACE(name, proto, args)				\
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 	__DECLARE_TRACE(name, PARAMS(proto), PARAMS(args),		\
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@@ -558,4 +570,19 @@
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 #define TRACE_EVENT_PERF_PERM(event, expr...)
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+#define DECLARE_EVENT_NOP(name, proto, args)				\
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+	static inline void trace_##name(proto)				\
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+	{ }								\
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+	static inline bool trace_##name##_enabled(void)			\
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+	{								\
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+		return false;						\
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+	}
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+
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+#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print)	\
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+	DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
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+
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+#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print)
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+#define DEFINE_EVENT_NOP(template, name, proto, args)			\
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+	DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args))
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+
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 #endif /* ifdef TRACE_EVENT (see note above) */