/* SPDX-License-Identifier: GPL-2.0 */ /* * Ftrace header. For implementation details beyond the random comments * scattered below, see: Documentation/trace/ftrace-design.rst */ #ifndef _LINUX_FTRACE_H #define _LINUX_FTRACE_H #include <linux/trace_recursion.h> #include <linux/trace_clock.h> #include <linux/jump_label.h> #include <linux/kallsyms.h> #include <linux/linkage.h> #include <linux/bitops.h> #include <linux/ptrace.h> #include <linux/ktime.h> #include <linux/sched.h> #include <linux/types.h> #include <linux/init.h> #include <linux/fs.h> #include <asm/ftrace.h> /* * If the arch supports passing the variable contents of * function_trace_op as the third parameter back from the * mcount call, then the arch should define this as 1. */ #ifndef ARCH_SUPPORTS_FTRACE_OPS #define ARCH_SUPPORTS_FTRACE_OPS … #endif #ifdef CONFIG_TRACING extern void ftrace_boot_snapshot(void); #else static inline void ftrace_boot_snapshot(void) { } #endif struct ftrace_ops; struct ftrace_regs; struct dyn_ftrace; char *arch_ftrace_match_adjust(char *str, const char *search); #ifdef CONFIG_HAVE_FUNCTION_GRAPH_RETVAL struct fgraph_ret_regs; unsigned long ftrace_return_to_handler(struct fgraph_ret_regs *ret_regs); #else unsigned long ftrace_return_to_handler(unsigned long frame_pointer); #endif #ifdef CONFIG_FUNCTION_TRACER /* * If the arch's mcount caller does not support all of ftrace's * features, then it must call an indirect function that * does. Or at least does enough to prevent any unwelcome side effects. * * Also define the function prototype that these architectures use * to call the ftrace_ops_list_func(). */ #if !ARCH_SUPPORTS_FTRACE_OPS #define FTRACE_FORCE_LIST_FUNC … void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip); #else #define FTRACE_FORCE_LIST_FUNC … void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct ftrace_regs *fregs); #endif extern const struct ftrace_ops ftrace_nop_ops; extern const struct ftrace_ops ftrace_list_ops; struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec); #endif /* CONFIG_FUNCTION_TRACER */ /* Main tracing buffer and events set up */ #ifdef CONFIG_TRACING void trace_init(void); void early_trace_init(void); #else static inline void trace_init(void) { } static inline void early_trace_init(void) { } #endif struct module; struct ftrace_hash; #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \ defined(CONFIG_DYNAMIC_FTRACE) int ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, char *sym); #else static inline int ftrace_mod_address_lookup(unsigned long addr, unsigned long *size, unsigned long *off, char **modname, char *sym) { return 0; } #endif #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE) int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported); #else static inline int ftrace_mod_get_kallsym(unsigned int symnum, unsigned long *value, char *type, char *name, char *module_name, int *exported) { return -1; } #endif #ifdef CONFIG_FUNCTION_TRACER extern int ftrace_enabled; #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS struct ftrace_regs { struct pt_regs regs; }; #define arch_ftrace_get_regs … /* * ftrace_regs_set_instruction_pointer() is to be defined by the architecture * if to allow setting of the instruction pointer from the ftrace_regs when * HAVE_DYNAMIC_FTRACE_WITH_ARGS is set and it supports live kernel patching. */ #define ftrace_regs_set_instruction_pointer … #endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs) { … } /* * When true, the ftrace_regs_{get,set}_*() functions may be used on fregs. * Note: this can be true even when ftrace_get_regs() cannot provide a pt_regs. */ static __always_inline bool ftrace_regs_has_args(struct ftrace_regs *fregs) { … } #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS #define ftrace_regs_get_instruction_pointer … #define ftrace_regs_get_argument … #define ftrace_regs_get_stack_pointer … #define ftrace_regs_return_value … #define ftrace_regs_set_return_value … #define ftrace_override_function_with_return … #define ftrace_regs_query_register_offset … #endif ftrace_func_t; ftrace_func_t ftrace_ops_get_func(struct ftrace_ops *ops); /* * FTRACE_OPS_FL_* bits denote the state of ftrace_ops struct and are * set in the flags member. * CONTROL, SAVE_REGS, SAVE_REGS_IF_SUPPORTED, RECURSION, STUB and * IPMODIFY are a kind of attribute flags which can be set only before * registering the ftrace_ops, and can not be modified while registered. * Changing those attribute flags after registering ftrace_ops will * cause unexpected results. * * ENABLED - set/unset when ftrace_ops is registered/unregistered * DYNAMIC - set when ftrace_ops is registered to denote dynamically * allocated ftrace_ops which need special care * SAVE_REGS - The ftrace_ops wants regs saved at each function called * and passed to the callback. If this flag is set, but the * architecture does not support passing regs * (CONFIG_DYNAMIC_FTRACE_WITH_REGS is not defined), then the * ftrace_ops will fail to register, unless the next flag * is set. * SAVE_REGS_IF_SUPPORTED - This is the same as SAVE_REGS, but if the * handler can handle an arch that does not save regs * (the handler tests if regs == NULL), then it can set * this flag instead. It will not fail registering the ftrace_ops * but, the regs field will be NULL if the arch does not support * passing regs to the handler. * Note, if this flag is set, the SAVE_REGS flag will automatically * get set upon registering the ftrace_ops, if the arch supports it. * RECURSION - The ftrace_ops can set this to tell the ftrace infrastructure * that the call back needs recursion protection. If it does * not set this, then the ftrace infrastructure will assume * that the callback can handle recursion on its own. * STUB - The ftrace_ops is just a place holder. * INITIALIZED - The ftrace_ops has already been initialized (first use time * register_ftrace_function() is called, it will initialized the ops) * DELETED - The ops are being deleted, do not let them be registered again. * ADDING - The ops is in the process of being added. * REMOVING - The ops is in the process of being removed. * MODIFYING - The ops is in the process of changing its filter functions. * ALLOC_TRAMP - A dynamic trampoline was allocated by the core code. * The arch specific code sets this flag when it allocated a * trampoline. This lets the arch know that it can update the * trampoline in case the callback function changes. * The ftrace_ops trampoline can be set by the ftrace users, and * in such cases the arch must not modify it. Only the arch ftrace * core code should set this flag. * IPMODIFY - The ops can modify the IP register. This can only be set with * SAVE_REGS. If another ops with this flag set is already registered * for any of the functions that this ops will be registered for, then * this ops will fail to register or set_filter_ip. * PID - Is affected by set_ftrace_pid (allows filtering on those pids) * RCU - Set when the ops can only be called when RCU is watching. * TRACE_ARRAY - The ops->private points to a trace_array descriptor. * PERMANENT - Set when the ops is permanent and should not be affected by * ftrace_enabled. * DIRECT - Used by the direct ftrace_ops helper for direct functions * (internal ftrace only, should not be used by others) * SUBOP - Is controlled by another op in field managed. */ enum { … }; #ifndef CONFIG_DYNAMIC_FTRACE_WITH_ARGS #define FTRACE_OPS_FL_SAVE_ARGS … #else #define FTRACE_OPS_FL_SAVE_ARGS … #endif /* * FTRACE_OPS_CMD_* commands allow the ftrace core logic to request changes * to a ftrace_ops. Note, the requests may fail. * * ENABLE_SHARE_IPMODIFY_SELF - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the DIRECT ops is being registered. * This is called with both direct_mutex and * ftrace_lock are locked. * * ENABLE_SHARE_IPMODIFY_PEER - enable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being registered. * This is called with direct_mutex locked. * * DISABLE_SHARE_IPMODIFY_PEER - disable a DIRECT ops to work on the same * function as an ops with IPMODIFY. Called * when the other ops (the one with IPMODIFY) * is being unregistered. * This is called with direct_mutex locked. */ enum ftrace_ops_cmd { … }; /* * For most ftrace_ops_cmd, * Returns: * 0 - Success. * Negative on failure. The return value is dependent on the * callback. */ ftrace_ops_func_t; #ifdef CONFIG_DYNAMIC_FTRACE /* The hash used to know what functions callbacks trace */ struct ftrace_ops_hash { … }; void ftrace_free_init_mem(void); void ftrace_free_mem(struct module *mod, void *start, void *end); #else static inline void ftrace_free_init_mem(void) { ftrace_boot_snapshot(); } static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } #endif /* * Note, ftrace_ops can be referenced outside of RCU protection, unless * the RCU flag is set. If ftrace_ops is allocated and not part of kernel * core data, the unregistering of it will perform a scheduling on all CPUs * to make sure that there are no more users. Depending on the load of the * system that may take a bit of time. * * Any private data added must also take care not to be freed and if private * data is added to a ftrace_ops that is in core code, the user of the * ftrace_ops must perform a schedule_on_each_cpu() before freeing it. */ struct ftrace_ops { … }; extern struct ftrace_ops __rcu *ftrace_ops_list; extern struct ftrace_ops ftrace_list_end; /* * Traverse the ftrace_ops_list, invoking all entries. The reason that we * can use rcu_dereference_raw_check() is that elements removed from this list * are simply leaked, so there is no need to interact with a grace-period * mechanism. The rcu_dereference_raw_check() calls are needed to handle * concurrent insertions into the ftrace_ops_list. * * Silly Alpha and silly pointer-speculation compiler optimizations! */ #define do_for_each_ftrace_op(op, list) … /* * Optimized for just a single item in the list (as that is the normal case). */ #define while_for_each_ftrace_op(op) … /* * Type of the current tracing. */ enum ftrace_tracing_type_t { … }; /* Current tracing type, default is FTRACE_TYPE_ENTER */ extern enum ftrace_tracing_type_t ftrace_tracing_type; /* * The ftrace_ops must be a static and should also * be read_mostly. These functions do modify read_mostly variables * so use them sparely. Never free an ftrace_op or modify the * next pointer after it has been registered. Even after unregistering * it, the next pointer may still be used internally. */ int register_ftrace_function(struct ftrace_ops *ops); int unregister_ftrace_function(struct ftrace_ops *ops); extern void ftrace_stub(unsigned long a0, unsigned long a1, struct ftrace_ops *op, struct ftrace_regs *fregs); int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs); #else /* !CONFIG_FUNCTION_TRACER */ /* * (un)register_ftrace_function must be a macro since the ops parameter * must not be evaluated. */ #define register_ftrace_function … #define unregister_ftrace_function … static inline void ftrace_kill(void) { } static inline void ftrace_free_init_mem(void) { } static inline void ftrace_free_mem(struct module *mod, void *start, void *end) { } static inline int ftrace_lookup_symbols(const char **sorted_syms, size_t cnt, unsigned long *addrs) { return -EOPNOTSUPP; } #endif /* CONFIG_FUNCTION_TRACER */ struct ftrace_func_entry { … }; #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS unsigned long ftrace_find_rec_direct(unsigned long ip); int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, bool free_filters); int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr); int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr); void ftrace_stub_direct_tramp(void); #else struct ftrace_ops; static inline unsigned long ftrace_find_rec_direct(unsigned long ip) { return 0; } static inline int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) { return -ENODEV; } static inline int unregister_ftrace_direct(struct ftrace_ops *ops, unsigned long addr, bool free_filters) { return -ENODEV; } static inline int modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) { return -ENODEV; } static inline int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr) { return -ENODEV; } /* * This must be implemented by the architecture. * It is the way the ftrace direct_ops helper, when called * via ftrace (because there's other callbacks besides the * direct call), can inform the architecture's trampoline that this * routine has a direct caller, and what the caller is. * * For example, in x86, it returns the direct caller * callback function via the regs->orig_ax parameter. * Then in the ftrace trampoline, if this is set, it makes * the return from the trampoline jump to the direct caller * instead of going back to the function it just traced. */ static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr) { } #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ #ifdef CONFIG_STACK_TRACER extern int stack_tracer_enabled; int stack_trace_sysctl(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos); /* DO NOT MODIFY THIS VARIABLE DIRECTLY! */ DECLARE_PER_CPU(int, disable_stack_tracer); /** * stack_tracer_disable - temporarily disable the stack tracer * * There's a few locations (namely in RCU) where stack tracing * cannot be executed. This function is used to disable stack * tracing during those critical sections. * * This function must be called with preemption or interrupts * disabled and stack_tracer_enable() must be called shortly after * while preemption or interrupts are still disabled. */ static inline void stack_tracer_disable(void) { … } /** * stack_tracer_enable - re-enable the stack tracer * * After stack_tracer_disable() is called, stack_tracer_enable() * must be called shortly afterward. */ static inline void stack_tracer_enable(void) { … } #else static inline void stack_tracer_disable(void) { } static inline void stack_tracer_enable(void) { } #endif enum { … }; #ifdef CONFIG_DYNAMIC_FTRACE void ftrace_arch_code_modify_prepare(void); void ftrace_arch_code_modify_post_process(void); enum ftrace_bug_type { … }; extern enum ftrace_bug_type ftrace_bug_type; /* * Archs can set this to point to a variable that holds the value that was * expected at the call site before calling ftrace_bug(). */ extern const void *ftrace_expected; void ftrace_bug(int err, struct dyn_ftrace *rec); struct seq_file; extern int ftrace_text_reserved(const void *start, const void *end); struct ftrace_ops *ftrace_ops_trampoline(unsigned long addr); bool is_ftrace_trampoline(unsigned long addr); /* * The dyn_ftrace record's flags field is split into two parts. * the first part which is '0-FTRACE_REF_MAX' is a counter of * the number of callbacks that have registered the function that * the dyn_ftrace descriptor represents. * * The second part is a mask: * ENABLED - the function is being traced * REGS - the record wants the function to save regs * REGS_EN - the function is set up to save regs. * IPMODIFY - the record allows for the IP address to be changed. * DISABLED - the record is not ready to be touched yet * DIRECT - there is a direct function to call * CALL_OPS - the record can use callsite-specific ops * CALL_OPS_EN - the function is set up to use callsite-specific ops * TOUCHED - A callback was added since boot up * MODIFIED - The function had IPMODIFY or DIRECT attached to it * * When a new ftrace_ops is registered and wants a function to save * pt_regs, the rec->flags REGS is set. When the function has been * set up to save regs, the REG_EN flag is set. Once a function * starts saving regs it will do so until all ftrace_ops are removed * from tracing that function. */ enum { … }; #define FTRACE_REF_MAX_SHIFT … #define FTRACE_REF_MAX … #define ftrace_rec_count(rec) … struct dyn_ftrace { … }; int ftrace_set_filter_ip(struct ftrace_ops *ops, unsigned long ip, int remove, int reset); int ftrace_set_filter_ips(struct ftrace_ops *ops, unsigned long *ips, unsigned int cnt, int remove, int reset); int ftrace_set_filter(struct ftrace_ops *ops, unsigned char *buf, int len, int reset); int ftrace_set_notrace(struct ftrace_ops *ops, unsigned char *buf, int len, int reset); void ftrace_set_global_filter(unsigned char *buf, int len, int reset); void ftrace_set_global_notrace(unsigned char *buf, int len, int reset); void ftrace_free_filter(struct ftrace_ops *ops); void ftrace_ops_set_global_filter(struct ftrace_ops *ops); /* * The FTRACE_UPDATE_* enum is used to pass information back * from the ftrace_update_record() and ftrace_test_record() * functions. These are called by the code update routines * to find out what is to be done for a given function. * * IGNORE - The function is already what we want it to be * MAKE_CALL - Start tracing the function * MODIFY_CALL - Stop saving regs for the function * MAKE_NOP - Stop tracing the function */ enum { … }; enum { … }; void arch_ftrace_update_code(int command); void arch_ftrace_update_trampoline(struct ftrace_ops *ops); void *arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec); void arch_ftrace_trampoline_free(struct ftrace_ops *ops); struct ftrace_rec_iter; struct ftrace_rec_iter *ftrace_rec_iter_start(void); struct ftrace_rec_iter *ftrace_rec_iter_next(struct ftrace_rec_iter *iter); struct dyn_ftrace *ftrace_rec_iter_record(struct ftrace_rec_iter *iter); #define for_ftrace_rec_iter(iter) … int ftrace_update_record(struct dyn_ftrace *rec, bool enable); int ftrace_test_record(struct dyn_ftrace *rec, bool enable); void ftrace_run_stop_machine(int command); unsigned long ftrace_location(unsigned long ip); unsigned long ftrace_location_range(unsigned long start, unsigned long end); unsigned long ftrace_get_addr_new(struct dyn_ftrace *rec); unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec); extern ftrace_func_t ftrace_trace_function; int ftrace_regex_open(struct ftrace_ops *ops, int flag, struct inode *inode, struct file *file); ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos); ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos); int ftrace_regex_release(struct inode *inode, struct file *file); void __init ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable); /* defined in arch */ extern int ftrace_dyn_arch_init(void); extern void ftrace_replace_code(int enable); extern int ftrace_update_ftrace_func(ftrace_func_t func); extern void ftrace_caller(void); extern void ftrace_regs_caller(void); extern void ftrace_call(void); extern void ftrace_regs_call(void); extern void mcount_call(void); void ftrace_modify_all_code(int command); #ifndef FTRACE_ADDR #define FTRACE_ADDR … #endif #ifndef FTRACE_GRAPH_ADDR #define FTRACE_GRAPH_ADDR … #endif #ifndef FTRACE_REGS_ADDR #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS #define FTRACE_REGS_ADDR … #else #define FTRACE_REGS_ADDR … #endif #endif /* * If an arch would like functions that are only traced * by the function graph tracer to jump directly to its own * trampoline, then they can define FTRACE_GRAPH_TRAMP_ADDR * to be that address to jump to. */ #ifndef FTRACE_GRAPH_TRAMP_ADDR #define FTRACE_GRAPH_TRAMP_ADDR … #endif #ifdef CONFIG_FUNCTION_GRAPH_TRACER extern void ftrace_graph_caller(void); extern int ftrace_enable_ftrace_graph_caller(void); extern int ftrace_disable_ftrace_graph_caller(void); #else static inline int ftrace_enable_ftrace_graph_caller(void) { return 0; } static inline int ftrace_disable_ftrace_graph_caller(void) { return 0; } #endif /** * ftrace_make_nop - convert code into nop * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should be calling * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a caller to @addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */ extern int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec, unsigned long addr); /** * ftrace_need_init_nop - return whether nop call sites should be initialized * * Normally the compiler's -mnop-mcount generates suitable nops, so we don't * need to call ftrace_init_nop() if the code is built with that flag. * Architectures where this is not always the case may define their own * condition. * * Return must be: * 0 if ftrace_init_nop() should be called * Nonzero if ftrace_init_nop() should not be called */ #ifndef ftrace_need_init_nop #define ftrace_need_init_nop() … #endif /** * ftrace_init_nop - initialize a nop call site * @mod: module structure if called by module load initialization * @rec: the call site record (e.g. mcount/fentry) * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should contain the contents created by * the compiler * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */ #ifndef ftrace_init_nop static inline int ftrace_init_nop(struct module *mod, struct dyn_ftrace *rec) { … } #endif /** * ftrace_make_call - convert a nop call site into a call to addr * @rec: the call site record (e.g. mcount/fentry) * @addr: the address that the call site should call * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * The code segment at @rec->ip should be a nop * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */ extern int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr); #if defined(CONFIG_DYNAMIC_FTRACE_WITH_REGS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_CALL_OPS) || \ defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) /** * ftrace_modify_call - convert from one addr to another (no nop) * @rec: the call site record (e.g. mcount/fentry) * @old_addr: the address expected to be currently called to * @addr: the address to change to * * This is a very sensitive operation and great care needs * to be taken by the arch. The operation should carefully * read the location, check to see if what is read is indeed * what we expect it to be, and then on success of the compare, * it should write to the location. * * When using call ops, this is called when the associated ops change, even * when (addr == old_addr). * * The code segment at @rec->ip should be a caller to @old_addr * * Return must be: * 0 on success * -EFAULT on error reading the location * -EINVAL on a failed compare of the contents * -EPERM on error writing to the location * Any other value will be considered a failure. */ extern int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr); #else /* Should never be called */ static inline int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr) { return -EINVAL; } #endif extern int skip_trace(unsigned long ip); extern void ftrace_module_init(struct module *mod); extern void ftrace_module_enable(struct module *mod); extern void ftrace_release_mod(struct module *mod); #else /* CONFIG_DYNAMIC_FTRACE */ static inline int skip_trace(unsigned long ip) { return 0; } static inline void ftrace_module_init(struct module *mod) { } static inline void ftrace_module_enable(struct module *mod) { } static inline void ftrace_release_mod(struct module *mod) { } static inline int ftrace_text_reserved(const void *start, const void *end) { return 0; } static inline unsigned long ftrace_location(unsigned long ip) { return 0; } /* * Again users of functions that have ftrace_ops may not * have them defined when ftrace is not enabled, but these * functions may still be called. Use a macro instead of inline. */ #define ftrace_regex_open … #define ftrace_set_early_filter … #define ftrace_set_filter_ip … #define ftrace_set_filter_ips … #define ftrace_set_filter … #define ftrace_set_notrace … #define ftrace_free_filter … #define ftrace_ops_set_global_filter … static inline ssize_t ftrace_filter_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { return -ENODEV; } static inline ssize_t ftrace_notrace_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { return -ENODEV; } static inline int ftrace_regex_release(struct inode *inode, struct file *file) { return -ENODEV; } static inline bool is_ftrace_trampoline(unsigned long addr) { return false; } #endif /* CONFIG_DYNAMIC_FTRACE */ #ifdef CONFIG_FUNCTION_GRAPH_TRACER #ifndef ftrace_graph_func #define ftrace_graph_func … #define FTRACE_OPS_GRAPH_STUB … #else #define FTRACE_OPS_GRAPH_STUB … #endif #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ /* totally disable ftrace - can not re-enable after this */ void ftrace_kill(void); static inline void tracer_disable(void) { … } /* * Ftrace disable/restore without lock. Some synchronization mechanism * must be used to prevent ftrace_enabled to be changed between * disable/restore. */ static inline int __ftrace_enabled_save(void) { … } static inline void __ftrace_enabled_restore(int enabled) { … } /* All archs should have this, but we define it for consistency */ #ifndef ftrace_return_address0 #define ftrace_return_address0 … #endif /* Archs may use other ways for ADDR1 and beyond */ #ifndef ftrace_return_address # ifdef CONFIG_FRAME_POINTER #define ftrace_return_address … # else #define ftrace_return_address(n) … # endif #endif #define CALLER_ADDR0 … #define CALLER_ADDR1 … #define CALLER_ADDR2 … #define CALLER_ADDR3 … #define CALLER_ADDR4 … #define CALLER_ADDR5 … #define CALLER_ADDR6 … static __always_inline unsigned long get_lock_parent_ip(void) { … } #ifdef CONFIG_TRACE_PREEMPT_TOGGLE extern void trace_preempt_on(unsigned long a0, unsigned long a1); extern void trace_preempt_off(unsigned long a0, unsigned long a1); #else /* * Use defines instead of static inlines because some arches will make code out * of the CALLER_ADDR, when we really want these to be a real nop. */ #define trace_preempt_on … #define trace_preempt_off … #endif #ifdef CONFIG_FTRACE_MCOUNT_RECORD extern void ftrace_init(void); #ifdef CC_USING_PATCHABLE_FUNCTION_ENTRY #define FTRACE_CALLSITE_SECTION … #else #define FTRACE_CALLSITE_SECTION … #endif #else static inline void ftrace_init(void) { } #endif /* * Structure that defines an entry function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end. */ struct ftrace_graph_ent { … } __packed; /* * Structure that defines a return function trace. * It's already packed but the attribute "packed" is needed * to remove extra padding at the end. */ struct ftrace_graph_ret { … } __packed; struct fgraph_ops; /* Type of the callback handlers for tracing function graph*/ trace_func_graph_ret_t; /* return */ trace_func_graph_ent_t; /* entry */ extern int ftrace_graph_entry_stub(struct ftrace_graph_ent *trace, struct fgraph_ops *gops); bool ftrace_pids_enabled(struct ftrace_ops *ops); #ifdef CONFIG_FUNCTION_GRAPH_TRACER struct fgraph_ops { … }; void *fgraph_reserve_data(int idx, int size_bytes); void *fgraph_retrieve_data(int idx, int *size_bytes); /* * Stack of return addresses for functions * of a thread. * Used in struct thread_info */ struct ftrace_ret_stack { … }; /* * Primary handler of a function return. * It relays on ftrace_return_to_handler. * Defined in entry_32/64.S */ extern void return_to_handler(void); extern int function_graph_enter(unsigned long ret, unsigned long func, unsigned long frame_pointer, unsigned long *retp); struct ftrace_ret_stack * ftrace_graph_get_ret_stack(struct task_struct *task, int skip); unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, unsigned long *retp); unsigned long *fgraph_get_task_var(struct fgraph_ops *gops); /* * Sometimes we don't want to trace a function with the function * graph tracer but we want them to keep traced by the usual function * tracer if the function graph tracer is not configured. */ #define __notrace_funcgraph … #define FTRACE_RETFUNC_DEPTH … #define FTRACE_RETSTACK_ALLOC_SIZE … extern int register_ftrace_graph(struct fgraph_ops *ops); extern void unregister_ftrace_graph(struct fgraph_ops *ops); /** * ftrace_graph_is_dead - returns true if ftrace_graph_stop() was called * * ftrace_graph_stop() is called when a severe error is detected in * the function graph tracing. This function is called by the critical * paths of function graph to keep those paths from doing any more harm. */ DECLARE_STATIC_KEY_FALSE(kill_ftrace_graph); static inline bool ftrace_graph_is_dead(void) { … } extern void ftrace_graph_stop(void); /* The current handlers in use */ extern trace_func_graph_ret_t ftrace_graph_return; extern trace_func_graph_ent_t ftrace_graph_entry; extern void ftrace_graph_init_task(struct task_struct *t); extern void ftrace_graph_exit_task(struct task_struct *t); extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu); /* Used by assembly, but to quiet sparse warnings */ extern struct ftrace_ops *function_trace_op; static inline void pause_graph_tracing(void) { … } static inline void unpause_graph_tracing(void) { … } #else /* !CONFIG_FUNCTION_GRAPH_TRACER */ #define __notrace_funcgraph static inline void ftrace_graph_init_task(struct task_struct *t) { } static inline void ftrace_graph_exit_task(struct task_struct *t) { } static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { } /* Define as macros as fgraph_ops may not be defined */ #define register_ftrace_graph … #define unregister_ftrace_graph … static inline unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx, unsigned long ret, unsigned long *retp) { return ret; } static inline void pause_graph_tracing(void) { } static inline void unpause_graph_tracing(void) { } #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ #ifdef CONFIG_TRACING enum ftrace_dump_mode; #define MAX_TRACER_SIZE … extern char ftrace_dump_on_oops[]; extern int ftrace_dump_on_oops_enabled(void); extern int tracepoint_printk; extern void disable_trace_on_warning(void); extern int __disable_trace_on_warning; int tracepoint_printk_sysctl(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos); #else /* CONFIG_TRACING */ static inline void disable_trace_on_warning(void) { } #endif /* CONFIG_TRACING */ #ifdef CONFIG_FTRACE_SYSCALLS unsigned long arch_syscall_addr(int nr); #endif /* CONFIG_FTRACE_SYSCALLS */ #endif /* _LINUX_FTRACE_H */
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