1#ifndef _LINUX_HW_BREAKPOINT_H
2#define _LINUX_HW_BREAKPOINT_H
3
4#include <linux/perf_event.h>
5#include <uapi/linux/hw_breakpoint.h>
6
7#ifdef CONFIG_HAVE_HW_BREAKPOINT
8
9extern int __init init_hw_breakpoint(void);
10
11static inline void hw_breakpoint_init(struct perf_event_attr *attr)
12{
13	memset(attr, 0, sizeof(*attr));
14
15	attr->type = PERF_TYPE_BREAKPOINT;
16	attr->size = sizeof(*attr);
17	/*
18	 * As it's for in-kernel or ptrace use, we want it to be pinned
19	 * and to call its callback every hits.
20	 */
21	attr->pinned = 1;
22	attr->sample_period = 1;
23}
24
25static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
26{
27	hw_breakpoint_init(attr);
28	attr->exclude_kernel = 1;
29}
30
31static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
32{
33	return bp->attr.bp_addr;
34}
35
36static inline int hw_breakpoint_type(struct perf_event *bp)
37{
38	return bp->attr.bp_type;
39}
40
41static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
42{
43	return bp->attr.bp_len;
44}
45
46extern struct perf_event *
47register_user_hw_breakpoint(struct perf_event_attr *attr,
48			    perf_overflow_handler_t triggered,
49			    void *context,
50			    struct task_struct *tsk);
51
52/* FIXME: only change from the attr, and don't unregister */
53extern int
54modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
55
56/*
57 * Kernel breakpoints are not associated with any particular thread.
58 */
59extern struct perf_event *
60register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
61				perf_overflow_handler_t	triggered,
62				void *context,
63				int cpu);
64
65extern struct perf_event * __percpu *
66register_wide_hw_breakpoint(struct perf_event_attr *attr,
67			    perf_overflow_handler_t triggered,
68			    void *context);
69
70extern int register_perf_hw_breakpoint(struct perf_event *bp);
71extern int __register_perf_hw_breakpoint(struct perf_event *bp);
72extern void unregister_hw_breakpoint(struct perf_event *bp);
73extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
74
75extern int dbg_reserve_bp_slot(struct perf_event *bp);
76extern int dbg_release_bp_slot(struct perf_event *bp);
77extern int reserve_bp_slot(struct perf_event *bp);
78extern void release_bp_slot(struct perf_event *bp);
79
80extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
81
82static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
83{
84	return &bp->hw.info;
85}
86
87#else /* !CONFIG_HAVE_HW_BREAKPOINT */
88
89static inline int __init init_hw_breakpoint(void) { return 0; }
90
91static inline struct perf_event *
92register_user_hw_breakpoint(struct perf_event_attr *attr,
93			    perf_overflow_handler_t triggered,
94			    void *context,
95			    struct task_struct *tsk)	{ return NULL; }
96static inline int
97modify_user_hw_breakpoint(struct perf_event *bp,
98			  struct perf_event_attr *attr)	{ return -ENOSYS; }
99static inline struct perf_event *
100register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
101				perf_overflow_handler_t	 triggered,
102				void *context,
103				int cpu)		{ return NULL; }
104static inline struct perf_event * __percpu *
105register_wide_hw_breakpoint(struct perf_event_attr *attr,
106			    perf_overflow_handler_t triggered,
107			    void *context)		{ return NULL; }
108static inline int
109register_perf_hw_breakpoint(struct perf_event *bp)	{ return -ENOSYS; }
110static inline int
111__register_perf_hw_breakpoint(struct perf_event *bp) 	{ return -ENOSYS; }
112static inline void unregister_hw_breakpoint(struct perf_event *bp)	{ }
113static inline void
114unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)	{ }
115static inline int
116reserve_bp_slot(struct perf_event *bp)			{return -ENOSYS; }
117static inline void release_bp_slot(struct perf_event *bp) 		{ }
118
119static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)	{ }
120
121static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
122{
123	return NULL;
124}
125
126#endif /* CONFIG_HAVE_HW_BREAKPOINT */
127#endif /* _LINUX_HW_BREAKPOINT_H */
128