Merge tag 'for-linus-20160523' of git://git.infradead.org/linux-mtd
[linux-2.6-block.git] / include / linux / hw_breakpoint.h
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
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
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
31 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
32 {
33         return bp->attr.bp_addr;
34 }
35
36 static inline int hw_breakpoint_type(struct perf_event *bp)
37 {
38         return bp->attr.bp_type;
39 }
40
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
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
89 static inline int __init init_hw_breakpoint(void) { return 0; }
90
91 static inline struct perf_event *
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
97 modify_user_hw_breakpoint(struct perf_event *bp,
98                           struct perf_event_attr *attr) { return -ENOSYS; }
99 static inline struct perf_event *
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 *
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
109 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
110 static inline int
111 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
112 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
113 static inline void
114 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
115 static inline int
116 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
117 static inline void release_bp_slot(struct perf_event *bp)               { }
118
119 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
120
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 */