diff options
Diffstat (limited to 'include/linux/tracepoint.h')
| -rw-r--r-- | include/linux/tracepoint.h | 565 |
1 files changed, 415 insertions, 150 deletions
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index ebeab360d851..8a56f3278b1b 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -1,90 +1,168 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef _LINUX_TRACEPOINT_H #define _LINUX_TRACEPOINT_H /* * Kernel Tracepoint API. * - * See Documentation/trace/tracepoints.txt. + * See Documentation/trace/tracepoints.rst. * - * (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> + * Copyright (C) 2008-2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> * * Heavily inspired from the Linux Kernel Markers. - * - * This file is released under the GPLv2. - * See the file COPYING for more details. */ +#include <linux/smp.h> +#include <linux/srcu.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/rcupdate.h> -#include <linux/static_key.h> +#include <linux/rcupdate_trace.h> +#include <linux/tracepoint-defs.h> +#include <linux/static_call.h> struct module; struct tracepoint; +struct notifier_block; -struct tracepoint_func { - void *func; - void *data; -}; - -struct tracepoint { - const char *name; /* Tracepoint name */ - struct static_key key; - void (*regfunc)(void); - void (*unregfunc)(void); - struct tracepoint_func __rcu *funcs; +struct trace_eval_map { + const char *system; + const char *eval_string; + unsigned long eval_value; }; -/* - * Connect a probe to a tracepoint. - * Internal API, should not be used directly. - */ -extern int tracepoint_probe_register(const char *name, void *probe, void *data); +#define TRACEPOINT_DEFAULT_PRIO 10 -/* - * Disconnect a probe from a tracepoint. - * Internal API, should not be used directly. - */ extern int -tracepoint_probe_unregister(const char *name, void *probe, void *data); - -extern int tracepoint_probe_register_noupdate(const char *name, void *probe, - void *data); -extern int tracepoint_probe_unregister_noupdate(const char *name, void *probe, - void *data); -extern void tracepoint_probe_update_all(void); +tracepoint_probe_register(struct tracepoint *tp, void *probe, void *data); +extern int +tracepoint_probe_register_prio(struct tracepoint *tp, void *probe, void *data, + int prio); +extern int +tracepoint_probe_register_prio_may_exist(struct tracepoint *tp, void *probe, void *data, + int prio); +extern int +tracepoint_probe_unregister(struct tracepoint *tp, void *probe, void *data); +static inline int +tracepoint_probe_register_may_exist(struct tracepoint *tp, void *probe, + void *data) +{ + return tracepoint_probe_register_prio_may_exist(tp, probe, data, + TRACEPOINT_DEFAULT_PRIO); +} +extern void +for_each_kernel_tracepoint(void (*fct)(struct tracepoint *tp, void *priv), + void *priv); #ifdef CONFIG_MODULES struct tp_module { struct list_head list; - unsigned int num_tracepoints; - struct tracepoint * const *tracepoints_ptrs; + struct module *mod; }; -#endif /* CONFIG_MODULES */ -struct tracepoint_iter { -#ifdef CONFIG_MODULES - struct tp_module *module; +bool trace_module_has_bad_taint(struct module *mod); +extern int register_tracepoint_module_notifier(struct notifier_block *nb); +extern int unregister_tracepoint_module_notifier(struct notifier_block *nb); +void for_each_module_tracepoint(void (*fct)(struct tracepoint *, + struct module *, void *), + void *priv); +void for_each_tracepoint_in_module(struct module *, + void (*fct)(struct tracepoint *, + struct module *, void *), + void *priv); +#else +static inline bool trace_module_has_bad_taint(struct module *mod) +{ + return false; +} +static inline +int register_tracepoint_module_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline +int unregister_tracepoint_module_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline +void for_each_module_tracepoint(void (*fct)(struct tracepoint *, + struct module *, void *), + void *priv) +{ +} +static inline +void for_each_tracepoint_in_module(struct module *mod, + void (*fct)(struct tracepoint *, + struct module *, void *), + void *priv) +{ +} #endif /* CONFIG_MODULES */ - 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); /* * 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. + * + * An alternative is to use the following for batch reclaim associated + * with a given tracepoint: + * + * - tracepoint_is_faultable() == false: call_rcu() + * - tracepoint_is_faultable() == true: call_rcu_tasks_trace() */ +#ifdef CONFIG_TRACEPOINTS +static inline void tracepoint_synchronize_unregister(void) +{ + synchronize_rcu_tasks_trace(); + synchronize_rcu(); +} +static inline bool tracepoint_is_faultable(struct tracepoint *tp) +{ + return tp->ext && tp->ext->faultable; +} +#else static inline void tracepoint_synchronize_unregister(void) +{ } +static inline bool tracepoint_is_faultable(struct tracepoint *tp) { - synchronize_sched(); + return false; } +#endif + +#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS +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) + +#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS +static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) +{ + return offset_to_ptr(p); +} + +#define __TRACEPOINT_ENTRY(name) \ + asm(" .section \"__tracepoints_ptrs\", \"a\" \n" \ + " .balign 4 \n" \ + " .long __tracepoint_" #name " - . \n" \ + " .previous \n") +#else +static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) +{ + return *p; +} + +#define __TRACEPOINT_ENTRY(name) \ + static tracepoint_ptr_t __tracepoint_ptr_##name __used \ + __section("__tracepoints_ptrs") = &__tracepoint_##name +#endif #endif /* _LINUX_TRACEPOINT_H */ @@ -102,119 +180,223 @@ static inline void tracepoint_synchronize_unregister(void) #define TP_ARGS(args...) args #define TP_CONDITION(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. - * - * Note, the proto and args passed in includes "__data" as the first parameter. - * The reason for this is to handle the "void" prototype. If a tracepoint - * has a "void" prototype, then it is invalid to declare a function - * as "(void *, void)". The DECLARE_TRACE_NOARGS() will pass in just - * "void *data", where as the DECLARE_TRACE() will pass in "void *data, proto". + * Individual subsystem my have a separate configuration to + * enable their tracepoints. By default, this file will create + * the tracepoints if CONFIG_TRACEPOINTS is defined. If a subsystem + * wants to be able to disable its tracepoints from being created + * it can define NOTRACE before including the tracepoint headers. */ -#define __DO_TRACE(tp, proto, args, cond, prercu, postrcu) \ +#if defined(CONFIG_TRACEPOINTS) && !defined(NOTRACE) +#define TRACEPOINTS_ENABLED +#endif + +#ifdef TRACEPOINTS_ENABLED + +#ifdef CONFIG_HAVE_STATIC_CALL +#define __DO_TRACE_CALL(name, args) \ do { \ struct tracepoint_func *it_func_ptr; \ - void *it_func; \ void *__data; \ - \ - if (!(cond)) \ - return; \ - prercu; \ - rcu_read_lock_sched_notrace(); \ - it_func_ptr = rcu_dereference_sched((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; \ + static_call(tp_func_##name)(__data, args); \ } \ - rcu_read_unlock_sched_notrace(); \ - postrcu; \ } while (0) +#else +#define __DO_TRACE_CALL(name, args) __traceiter_##name(NULL, args) +#endif /* CONFIG_HAVE_STATIC_CALL */ -#ifndef MODULE -#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) \ - static inline void trace_##name##_rcuidle(proto) \ +/* + * Declare an exported function that Rust code can call to trigger this + * tracepoint. This function does not include the static branch; that is done + * in Rust to avoid a function call when the tracepoint is disabled. + */ +#define DEFINE_RUST_DO_TRACE(name, proto, args) +#define __DEFINE_RUST_DO_TRACE(name, proto, args) \ + notrace void rust_do_trace_##name(proto) \ { \ - if (static_key_false(&__tracepoint_##name.key)) \ - __DO_TRACE(&__tracepoint_##name, \ - TP_PROTO(data_proto), \ - TP_ARGS(data_args), \ - TP_CONDITION(cond), \ - rcu_irq_enter(), \ - rcu_irq_exit()); \ + __do_trace_##name(args); \ } -#else -#define __DECLARE_TRACE_RCU(name, proto, args, cond, data_proto, data_args) -#endif + +/* + * When a tracepoint is used, it's name is added to the __tracepoint_check + * section. This section is only used at build time to make sure all + * defined tracepoints are used. It is discarded after the build. + */ +# define TRACEPOINT_CHECK(name) \ + static const char __used __section("__tracepoint_check") \ + __trace_check_##name[] = #name; /* * 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. + * + * When lockdep is enabled, we make sure to always test if RCU is + * "watching" regardless if the tracepoint is enabled or not. Tracepoints + * require RCU to be active, and it should always warn at the tracepoint + * site if it is not watching, as it will need to be active when the + * tracepoint is enabled. */ -#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \ +#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto) \ + extern int __traceiter_##name(data_proto); \ + DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name); \ extern struct tracepoint __tracepoint_##name; \ - static inline void trace_##name(proto) \ + extern void rust_do_trace_##name(proto); \ + static inline int \ + register_trace_##name(void (*probe)(data_proto), void *data) \ { \ - if (static_key_false(&__tracepoint_##name.key)) \ - __DO_TRACE(&__tracepoint_##name, \ - TP_PROTO(data_proto), \ - TP_ARGS(data_args), \ - TP_CONDITION(cond),,); \ + return tracepoint_probe_register(&__tracepoint_##name, \ + (void *)probe, data); \ } \ - __DECLARE_TRACE_RCU(name, PARAMS(proto), PARAMS(args), \ - PARAMS(cond), PARAMS(data_proto), PARAMS(data_args)) \ static inline int \ - register_trace_##name(void (*probe)(data_proto), void *data) \ + register_trace_prio_##name(void (*probe)(data_proto), void *data,\ + int prio) \ { \ - return tracepoint_probe_register(#name, (void *)probe, \ - data); \ + return tracepoint_probe_register_prio(&__tracepoint_##name, \ + (void *)probe, data, prio); \ } \ static inline int \ unregister_trace_##name(void (*probe)(data_proto), void *data) \ { \ - return tracepoint_probe_unregister(#name, (void *)probe, \ - data); \ + return tracepoint_probe_unregister(&__tracepoint_##name,\ + (void *)probe, data); \ } \ static inline void \ check_trace_callback_type_##name(void (*cb)(data_proto)) \ { \ + } \ + static inline bool \ + trace_##name##_enabled(void) \ + { \ + return static_branch_unlikely(&__tracepoint_##name.key);\ + } + +#define __DECLARE_TRACE(name, proto, args, cond, data_proto) \ + __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \ + static inline void __do_trace_##name(proto) \ + { \ + TRACEPOINT_CHECK(name) \ + if (cond) { \ + guard(preempt_notrace)(); \ + __DO_TRACE_CALL(name, TP_ARGS(args)); \ + } \ + } \ + static inline void trace_##name(proto) \ + { \ + if (static_branch_unlikely(&__tracepoint_##name.key)) \ + __do_trace_##name(args); \ + if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) { \ + WARN_ONCE(!rcu_is_watching(), \ + "RCU not watching for tracepoint"); \ + } \ + } + +#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \ + __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \ + static inline void __do_trace_##name(proto) \ + { \ + TRACEPOINT_CHECK(name) \ + guard(rcu_tasks_trace)(); \ + __DO_TRACE_CALL(name, TP_ARGS(args)); \ + } \ + static inline void trace_##name(proto) \ + { \ + might_fault(); \ + if (static_branch_unlikely(&__tracepoint_##name.key)) \ + __do_trace_##name(args); \ + if (IS_ENABLED(CONFIG_LOCKDEP)) { \ + WARN_ONCE(!rcu_is_watching(), \ + "RCU not watching for tracepoint"); \ + } \ } /* * We have no guarantee that gcc and the linker won't up-align the tracepoint * structures, so we create an array of pointers that will be used for iteration * on the 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 DEFINE_TRACE_FN(name, reg, unreg) \ - static const char __tpstrtab_##name[] \ - __attribute__((section("__tracepoints_strings"))) = #name; \ - struct tracepoint __tracepoint_##name \ - __attribute__((section("__tracepoints"))) = \ - { __tpstrtab_##name, STATIC_KEY_INIT_FALSE, reg, unreg, NULL };\ - static struct tracepoint * const __tracepoint_ptr_##name __used \ - __attribute__((section("__tracepoints_ptrs"))) = \ - &__tracepoint_##name; - -#define DEFINE_TRACE(name) \ - DEFINE_TRACE_FN(name, NULL, NULL); +#define __DEFINE_TRACE_EXT(_name, _ext, proto, args) \ + static const char __tpstrtab_##_name[] \ + __section("__tracepoints_strings") = #_name; \ + extern struct static_call_key STATIC_CALL_KEY(tp_func_##_name); \ + int __traceiter_##_name(void *__data, proto); \ + void __probestub_##_name(void *__data, proto); \ + struct tracepoint __tracepoint_##_name __used \ + __section("__tracepoints") = { \ + .name = __tpstrtab_##_name, \ + .key = STATIC_KEY_FALSE_INIT, \ + .static_call_key = &STATIC_CALL_KEY(tp_func_##_name), \ + .static_call_tramp = STATIC_CALL_TRAMP_ADDR(tp_func_##_name), \ + .iterator = &__traceiter_##_name, \ + .probestub = &__probestub_##_name, \ + .funcs = NULL, \ + .ext = _ext, \ + }; \ + __TRACEPOINT_ENTRY(_name); \ + int __traceiter_##_name(void *__data, proto) \ + { \ + struct tracepoint_func *it_func_ptr; \ + void *it_func; \ + \ + it_func_ptr = \ + rcu_dereference_raw((&__tracepoint_##_name)->funcs); \ + if (it_func_ptr) { \ + do { \ + it_func = READ_ONCE((it_func_ptr)->func); \ + __data = (it_func_ptr)->data; \ + ((void(*)(void *, proto))(it_func))(__data, args); \ + } while ((++it_func_ptr)->func); \ + } \ + return 0; \ + } \ + void __probestub_##_name(void *__data, proto) \ + { \ + } \ + DEFINE_STATIC_CALL(tp_func_##_name, __traceiter_##_name); \ + DEFINE_RUST_DO_TRACE(_name, TP_PROTO(proto), TP_ARGS(args)) + +#define DEFINE_TRACE_FN(_name, _reg, _unreg, _proto, _args) \ + static struct tracepoint_ext __tracepoint_ext_##_name = { \ + .regfunc = _reg, \ + .unregfunc = _unreg, \ + .faultable = false, \ + }; \ + __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args)); + +#define DEFINE_TRACE_SYSCALL(_name, _reg, _unreg, _proto, _args) \ + static struct tracepoint_ext __tracepoint_ext_##_name = { \ + .regfunc = _reg, \ + .unregfunc = _unreg, \ + .faultable = true, \ + }; \ + __DEFINE_TRACE_EXT(_name, &__tracepoint_ext_##_name, PARAMS(_proto), PARAMS(_args)); + +#define DEFINE_TRACE(_name, _proto, _args) \ + __DEFINE_TRACE_EXT(_name, NULL, PARAMS(_proto), PARAMS(_args)); #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) \ - EXPORT_SYMBOL_GPL(__tracepoint_##name) + TRACEPOINT_CHECK(name) \ + EXPORT_SYMBOL_GPL(__tracepoint_##name); \ + EXPORT_SYMBOL_GPL(__traceiter_##name); \ + EXPORT_STATIC_CALL_GPL(tp_func_##name) #define EXPORT_TRACEPOINT_SYMBOL(name) \ - EXPORT_SYMBOL(__tracepoint_##name) + TRACEPOINT_CHECK(name) \ + EXPORT_SYMBOL(__tracepoint_##name); \ + EXPORT_SYMBOL(__traceiter_##name); \ + EXPORT_STATIC_CALL(tp_func_##name) + -#else /* !CONFIG_TRACEPOINTS */ -#define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \ +#else /* !TRACEPOINTS_ENABLED */ +#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto) \ static inline void trace_##name(proto) \ { } \ - static inline void trace_##name##_rcuidle(proto) \ - { } \ static inline int \ register_trace_##name(void (*probe)(data_proto), \ void *data) \ @@ -229,44 +411,103 @@ static inline void tracepoint_synchronize_unregister(void) } \ static inline void check_trace_callback_type_##name(void (*cb)(data_proto)) \ { \ + } \ + static inline bool \ + trace_##name##_enabled(void) \ + { \ + return false; \ } -#define DEFINE_TRACE_FN(name, reg, unreg) -#define DEFINE_TRACE(name) +#define __DECLARE_TRACE(name, proto, args, cond, data_proto) \ + __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) + +#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto) \ + __DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) + +#define DEFINE_TRACE_FN(name, reg, unreg, proto, args) +#define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args) +#define DEFINE_TRACE(name, proto, args) #define EXPORT_TRACEPOINT_SYMBOL_GPL(name) #define EXPORT_TRACEPOINT_SYMBOL(name) -#endif /* CONFIG_TRACEPOINTS */ +#endif /* TRACEPOINTS_ENABLED */ -/* - * 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. +#ifdef CONFIG_TRACING +/** + * tracepoint_string - register constant persistent string to trace system + * @str - a constant persistent string that will be referenced in tracepoints * - * DECLARE_TRACE_NOARGS() passes "void" as the tracepoint prototype - * and "void *__data" as the callback prototype. + * If constant strings are being used in tracepoints, it is faster and + * more efficient to just save the pointer to the string and reference + * that with a printf "%s" instead of saving the string in the ring buffer + * and wasting space and time. * - * DECLARE_TRACE() passes "proto" as the tracepoint protoype and - * "void *__data, proto" as the callback prototype. + * The problem with the above approach is that userspace tools that read + * the binary output of the trace buffers do not have access to the string. + * Instead they just show the address of the string which is not very + * useful to users. + * + * With tracepoint_string(), the string will be registered to the tracing + * system and exported to userspace via the debugfs/tracing/printk_formats + * file that maps the string address to the string text. This way userspace + * tools that read the binary buffers have a way to map the pointers to + * the ASCII strings they represent. + * + * The @str used must be a constant string and persistent as it would not + * make sense to show a string that no longer exists. But it is still fine + * to be used with modules, because when modules are unloaded, if they + * had tracepoints, the ring buffers are cleared too. As long as the string + * does not change during the life of the module, it is fine to use + * tracepoint_string() within a module. */ -#define DECLARE_TRACE_NOARGS(name) \ - __DECLARE_TRACE(name, void, , 1, void *__data, __data) +#define tracepoint_string(str) \ + ({ \ + static const char *___tp_str __tracepoint_string = str; \ + ___tp_str; \ + }) +#define __tracepoint_string __used __section("__tracepoint_str") +#else +/* + * tracepoint_string() is used to save the string address for userspace + * tracing tools. When tracing isn't configured, there's no need to save + * anything. + */ +# define tracepoint_string(str) str +# define __tracepoint_string +#endif #define DECLARE_TRACE(name, proto, args) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), 1, \ - PARAMS(void *__data, proto), \ - PARAMS(__data, args)) + __DECLARE_TRACE(name##_tp, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()), \ + PARAMS(void *__data, proto)) #define DECLARE_TRACE_CONDITION(name, proto, args, cond) \ - __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), PARAMS(cond), \ - PARAMS(void *__data, proto), \ - PARAMS(__data, args)) + __DECLARE_TRACE(name##_tp, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \ + PARAMS(void *__data, proto)) + +#define DECLARE_TRACE_SYSCALL(name, proto, args) \ + __DECLARE_TRACE_SYSCALL(name##_tp, PARAMS(proto), PARAMS(args), \ + PARAMS(void *__data, proto)) + +#define DECLARE_TRACE_EVENT(name, proto, args) \ + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()), \ + PARAMS(void *__data, proto)) + +#define DECLARE_TRACE_EVENT_CONDITION(name, proto, args, cond) \ + __DECLARE_TRACE(name, PARAMS(proto), PARAMS(args), \ + cpu_online(raw_smp_processor_id()) && (PARAMS(cond)), \ + PARAMS(void *__data, proto)) + +#define DECLARE_TRACE_EVENT_SYSCALL(name, proto, args) \ + __DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args), \ + PARAMS(void *__data, proto)) #define TRACE_EVENT_FLAGS(event, flag) +#define TRACE_EVENT_PERF_PERM(event, expr...) + #endif /* DECLARE_TRACE */ #ifndef TRACE_EVENT @@ -274,7 +515,7 @@ static inline void tracepoint_synchronize_unregister(void) * For use with the TRACE_EVENT macro: * * We define a tracepoint, its arguments, its printk format - * and its 'fast binay record' layout. + * and its 'fast binary record' layout. * * Firstly, name your tracepoint via TRACE_EVENT(name : the * 'subsystem_event' notation is fine. @@ -309,11 +550,11 @@ static inline void tracepoint_synchronize_unregister(void) * * This is how the trace record is structured and will * * be saved into the ring buffer. These are the fields * * that will be exposed to user-space in - * * /sys/kernel/debug/tracing/events/<*>/format. + * * /sys/kernel/tracing/events/<*>/format. * * * * The declared 'local variable' is called '__entry' * * - * * __field(pid_t, prev_prid) is equivalent to a standard declariton: + * * __field(pid_t, prev_pid) is equivalent to a standard declaration: * * * * pid_t prev_pid; * * @@ -369,7 +610,7 @@ static inline void tracepoint_synchronize_unregister(void) * tracepoint callback (this is used by programmatic plugins and * can also by used by generic instrumentation like SystemTap), and * it is also used to expose a structured trace record in - * /sys/kernel/debug/tracing/events/. + * /sys/kernel/tracing/events/. * * A set of (un)registration functions can be passed to the variant * TRACE_EVENT_FN to perform any (un)registration work. @@ -377,26 +618,50 @@ static inline void tracepoint_synchronize_unregister(void) #define DECLARE_EVENT_CLASS(name, proto, args, tstruct, assign, print) #define DEFINE_EVENT(template, name, proto, args) \ - DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) + DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args)) #define DEFINE_EVENT_FN(template, name, proto, args, reg, unreg)\ - DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) + DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args)) #define DEFINE_EVENT_PRINT(template, name, proto, args, print) \ - DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) + DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args)) #define DEFINE_EVENT_CONDITION(template, name, proto, \ args, cond) \ - DECLARE_TRACE_CONDITION(name, PARAMS(proto), \ + DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \ PARAMS(args), PARAMS(cond)) #define TRACE_EVENT(name, proto, args, struct, assign, print) \ - DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) + DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args)) #define TRACE_EVENT_FN(name, proto, args, struct, \ assign, print, reg, unreg) \ - DECLARE_TRACE(name, PARAMS(proto), PARAMS(args)) + DECLARE_TRACE_EVENT(name, PARAMS(proto), PARAMS(args)) +#define TRACE_EVENT_FN_COND(name, proto, args, cond, struct, \ + assign, print, reg, unreg) \ + DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \ + PARAMS(args), PARAMS(cond)) #define TRACE_EVENT_CONDITION(name, proto, args, cond, \ struct, assign, print) \ - DECLARE_TRACE_CONDITION(name, PARAMS(proto), \ + DECLARE_TRACE_EVENT_CONDITION(name, PARAMS(proto), \ PARAMS(args), PARAMS(cond)) +#define TRACE_EVENT_SYSCALL(name, proto, args, struct, assign, \ + print, reg, unreg) \ + DECLARE_TRACE_EVENT_SYSCALL(name, PARAMS(proto), PARAMS(args)) #define TRACE_EVENT_FLAGS(event, flag) +#define TRACE_EVENT_PERF_PERM(event, expr...) + +#define DECLARE_EVENT_NOP(name, proto, args) \ + static inline void trace_##name(proto) \ + { } \ + static inline bool trace_##name##_enabled(void) \ + { \ + return false; \ + } + +#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + +#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print) +#define DEFINE_EVENT_NOP(template, name, proto, args) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + #endif /* ifdef TRACE_EVENT (see note above) */ |