Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
hw_breakpoint.h
Go to the documentation of this file.
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 */
Generated on Thu Jan 10 2013 12:55:09 for Linux Kernel by   doxygen 1.8.2