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f177a579d2
[ Upstream commit59a7a29856] Add nr_maxactive to specify rethook_node pool size. This means the maximum number of actively running target functions concurrently for probing by exit_handler. Note that if the running function is preempted or sleep, it is still counted as 'active'. Link: https://lkml.kernel.org/r/167526697917.433354.17779774988245113106.stgit@mhiramat.roam.corp.google.com Cc: Florent Revest <revest@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Stable-dep-of:700b2b4397("fprobe: Fix to ensure the number of active retprobes is not zero") Signed-off-by: Sasha Levin <sashal@kernel.org>
111 lines
3 KiB
C
111 lines
3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Simple ftrace probe wrapper */
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#ifndef _LINUX_FPROBE_H
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#define _LINUX_FPROBE_H
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#include <linux/compiler.h>
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#include <linux/ftrace.h>
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#include <linux/rethook.h>
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/**
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* struct fprobe - ftrace based probe.
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* @ops: The ftrace_ops.
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* @nmissed: The counter for missing events.
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* @flags: The status flag.
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* @rethook: The rethook data structure. (internal data)
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* @entry_data_size: The private data storage size.
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* @nr_maxactive: The max number of active functions.
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* @entry_handler: The callback function for function entry.
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* @exit_handler: The callback function for function exit.
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*/
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struct fprobe {
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#ifdef CONFIG_FUNCTION_TRACER
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/*
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* If CONFIG_FUNCTION_TRACER is not set, CONFIG_FPROBE is disabled too.
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* But user of fprobe may keep embedding the struct fprobe on their own
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* code. To avoid build error, this will keep the fprobe data structure
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* defined here, but remove ftrace_ops data structure.
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*/
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struct ftrace_ops ops;
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#endif
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unsigned long nmissed;
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unsigned int flags;
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struct rethook *rethook;
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size_t entry_data_size;
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int nr_maxactive;
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void (*entry_handler)(struct fprobe *fp, unsigned long entry_ip,
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struct pt_regs *regs, void *entry_data);
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void (*exit_handler)(struct fprobe *fp, unsigned long entry_ip,
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struct pt_regs *regs, void *entry_data);
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};
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/* This fprobe is soft-disabled. */
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#define FPROBE_FL_DISABLED 1
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/*
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* This fprobe handler will be shared with kprobes.
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* This flag must be set before registering.
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*/
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#define FPROBE_FL_KPROBE_SHARED 2
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static inline bool fprobe_disabled(struct fprobe *fp)
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{
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return (fp) ? fp->flags & FPROBE_FL_DISABLED : false;
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}
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static inline bool fprobe_shared_with_kprobes(struct fprobe *fp)
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{
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return (fp) ? fp->flags & FPROBE_FL_KPROBE_SHARED : false;
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}
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#ifdef CONFIG_FPROBE
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int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter);
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int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num);
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int register_fprobe_syms(struct fprobe *fp, const char **syms, int num);
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int unregister_fprobe(struct fprobe *fp);
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#else
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static inline int register_fprobe(struct fprobe *fp, const char *filter, const char *notfilter)
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{
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return -EOPNOTSUPP;
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}
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static inline int register_fprobe_ips(struct fprobe *fp, unsigned long *addrs, int num)
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{
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return -EOPNOTSUPP;
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}
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static inline int register_fprobe_syms(struct fprobe *fp, const char **syms, int num)
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{
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return -EOPNOTSUPP;
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}
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static inline int unregister_fprobe(struct fprobe *fp)
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{
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return -EOPNOTSUPP;
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}
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#endif
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/**
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* disable_fprobe() - Disable fprobe
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* @fp: The fprobe to be disabled.
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*
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* This will soft-disable @fp. Note that this doesn't remove the ftrace
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* hooks from the function entry.
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*/
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static inline void disable_fprobe(struct fprobe *fp)
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{
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if (fp)
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fp->flags |= FPROBE_FL_DISABLED;
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}
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/**
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* enable_fprobe() - Enable fprobe
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* @fp: The fprobe to be enabled.
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*
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* This will soft-enable @fp.
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*/
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static inline void enable_fprobe(struct fprobe *fp)
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{
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if (fp)
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fp->flags &= ~FPROBE_FL_DISABLED;
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}
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#endif
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