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
9 extern int __init init_hw_breakpoint(void);
10
hw_breakpoint_init(struct perf_event_attr * attr)11 static 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
ptrace_breakpoint_init(struct perf_event_attr * attr)25 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
26 {
27 hw_breakpoint_init(attr);
28 attr->exclude_kernel = 1;
29 }
30
hw_breakpoint_addr(struct perf_event * bp)31 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
32 {
33 return bp->attr.bp_addr;
34 }
35
hw_breakpoint_type(struct perf_event * bp)36 static inline int hw_breakpoint_type(struct perf_event *bp)
37 {
38 return bp->attr.bp_type;
39 }
40
hw_breakpoint_len(struct perf_event * bp)41 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
42 {
43 return bp->attr.bp_len;
44 }
45
46 extern struct perf_event *
47 register_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 */
53 extern int
54 modify_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 */
59 extern struct perf_event *
60 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
61 perf_overflow_handler_t triggered,
62 void *context,
63 int cpu);
64
65 extern struct perf_event * __percpu *
66 register_wide_hw_breakpoint(struct perf_event_attr *attr,
67 perf_overflow_handler_t triggered,
68 void *context);
69
70 extern int register_perf_hw_breakpoint(struct perf_event *bp);
71 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
72 extern void unregister_hw_breakpoint(struct perf_event *bp);
73 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
74
75 extern int dbg_reserve_bp_slot(struct perf_event *bp);
76 extern int dbg_release_bp_slot(struct perf_event *bp);
77 extern int reserve_bp_slot(struct perf_event *bp);
78 extern void release_bp_slot(struct perf_event *bp);
79
80 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
81
counter_arch_bp(struct perf_event * bp)82 static 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
init_hw_breakpoint(void)89 static inline int __init init_hw_breakpoint(void) { return 0; }
90
91 static inline struct perf_event *
register_user_hw_breakpoint(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context,struct task_struct * tsk)92 register_user_hw_breakpoint(struct perf_event_attr *attr,
93 perf_overflow_handler_t triggered,
94 void *context,
95 struct task_struct *tsk) { return NULL; }
96 static inline int
modify_user_hw_breakpoint(struct perf_event * bp,struct perf_event_attr * attr)97 modify_user_hw_breakpoint(struct perf_event *bp,
98 struct perf_event_attr *attr) { return -ENOSYS; }
99 static inline struct perf_event *
register_wide_hw_breakpoint_cpu(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context,int cpu)100 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
101 perf_overflow_handler_t triggered,
102 void *context,
103 int cpu) { return NULL; }
104 static inline struct perf_event * __percpu *
register_wide_hw_breakpoint(struct perf_event_attr * attr,perf_overflow_handler_t triggered,void * context)105 register_wide_hw_breakpoint(struct perf_event_attr *attr,
106 perf_overflow_handler_t triggered,
107 void *context) { return NULL; }
108 static inline int
register_perf_hw_breakpoint(struct perf_event * bp)109 register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
110 static inline int
__register_perf_hw_breakpoint(struct perf_event * bp)111 __register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
unregister_hw_breakpoint(struct perf_event * bp)112 static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
113 static inline void
unregister_wide_hw_breakpoint(struct perf_event * __percpu * cpu_events)114 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
115 static inline int
reserve_bp_slot(struct perf_event * bp)116 reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
release_bp_slot(struct perf_event * bp)117 static inline void release_bp_slot(struct perf_event *bp) { }
118
flush_ptrace_hw_breakpoint(struct task_struct * tsk)119 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
120
counter_arch_bp(struct perf_event * bp)121 static 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