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
19
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
53extern int
54modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
55
56
57
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
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
127#endif
128