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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162/* SPDX-License-Identifier: GPL-2.0 *//* Simple ftrace probe wrapper */#ifndef _LINUX_FPROBE_H#define _LINUX_FPROBE_H
#include <linux/compiler.h>#include <linux/ftrace.h>#include <linux/rcupdate.h>#include <linux/refcount.h>#include <linux/rhashtable.h>#include <linux/slab.h>
struct fprobe;typedef int (*fprobe_entry_cb)(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct ftrace_regs *regs, void *entry_data);
typedef void (*fprobe_exit_cb)(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct ftrace_regs *regs, void *entry_data);
/** * struct fprobe_hlist_node - address based hash list node for fprobe. * * @hlist: The hlist node for address search hash table. * @addr: One of the probing address of @fp. * @fp: The fprobe which owns this. */struct fprobe_hlist_node { struct rhlist_head hlist; unsigned long addr; struct fprobe *fp;};
/** * struct fprobe_hlist - hash list nodes for fprobe. * * @hlist: The hlist node for existence checking hash table. * @rcu: rcu_head for RCU deferred release. * @fp: The fprobe which owns this fprobe_hlist. * @size: The size of @array. * @array: The fprobe_hlist_node for each address to probe. */struct fprobe_hlist { struct hlist_node hlist; struct rcu_head rcu; struct fprobe *fp; int size; struct fprobe_hlist_node array[] __counted_by(size);};
/** * struct fprobe - ftrace based probe. * * @nmissed: The counter for missing events. * @flags: The status flag. * @entry_data_size: The private data storage size. * @entry_handler: The callback function for function entry. * @exit_handler: The callback function for function exit. * @hlist_array: The fprobe_hlist for fprobe search from IP hash table. */struct fprobe { unsigned long nmissed; unsigned int flags; size_t entry_data_size;
fprobe_entry_cb entry_handler; fprobe_exit_cb exit_handler;
struct fprobe_hlist *hlist_array;};
/* This fprobe is soft-disabled. */#define FPROBE_FL_DISABLED 1
/* * This fprobe handler will be shared with kprobes. * This flag must be set before registering. */#define FPROBE_FL_KPROBE_SHARED 2
static inline bool fprobe_disabled(struct fprobe *fp){ return (fp) ? fp->flags & FPROBE_FL_DISABLED : false;}
static inline bool fprobe_shared_with_kprobes(struct fprobe *fp){ return (fp) ? fp->flags & FPROBE_FL_KPROBE_SHARED : false;}
#ifdef CONFIG_FPROBEint register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter);int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num);int register_fprobe_syms(struct fprobe *fp, const char **syms, int num);int unregister_fprobe(struct fprobe *fp);int unregister_fprobe_async(struct fprobe *fp);bool fprobe_is_registered(struct fprobe *fp);int fprobe_count_ips_from_filter(const char *filter, const char *notfilter);#elsestatic inline int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter){ return -EOPNOTSUPP;}static inline int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num){ return -EOPNOTSUPP;}static inline int register_fprobe_syms(struct fprobe *fp, const char **syms, int num){ return -EOPNOTSUPP;}static inline int unregister_fprobe(struct fprobe *fp){ return -EOPNOTSUPP;}static inline int unregister_fprobe_async(struct fprobe *fp){ return -EOPNOTSUPP;}static inline bool fprobe_is_registered(struct fprobe *fp){ return false;}static inline int fprobe_count_ips_from_filter(const char *filter, const char *notfilter){ return -EOPNOTSUPP;}#endif
/** * disable_fprobe() - Disable fprobe * @fp: The fprobe to be disabled. * * This will soft-disable @fp. Note that this doesn't remove the ftrace * hooks from the function entry. */static inline void disable_fprobe(struct fprobe *fp){ if (fp) fp->flags |= FPROBE_FL_DISABLED;}
/** * enable_fprobe() - Enable fprobe * @fp: The fprobe to be enabled. * * This will soft-enable @fp. */static inline void enable_fprobe(struct fprobe *fp){ if (fp) fp->flags &= ~FPROBE_FL_DISABLED;}
/* The entry data size is 4 bits (=16) * sizeof(long) in maximum */#define FPROBE_DATA_SIZE_BITS 4#define MAX_FPROBE_DATA_SIZE_WORD ((1L << FPROBE_DATA_SIZE_BITS) - 1)#define MAX_FPROBE_DATA_SIZE (MAX_FPROBE_DATA_SIZE_WORD * sizeof(long))
#endif