Merge branches 'pm-cpufreq' and 'pm-cpuidle'
[linux-2.6-microblaze.git] / include / linux / hw_breakpoint.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_HW_BREAKPOINT_H
3 #define _LINUX_HW_BREAKPOINT_H
4
5 #include <linux/perf_event.h>
6 #include <uapi/linux/hw_breakpoint.h>
7
8 #ifdef CONFIG_HAVE_HW_BREAKPOINT
9
10 extern int __init init_hw_breakpoint(void);
11
12 static inline void hw_breakpoint_init(struct perf_event_attr *attr)
13 {
14         memset(attr, 0, sizeof(*attr));
15
16         attr->type = PERF_TYPE_BREAKPOINT;
17         attr->size = sizeof(*attr);
18         /*
19          * As it's for in-kernel or ptrace use, we want it to be pinned
20          * and to call its callback every hits.
21          */
22         attr->pinned = 1;
23         attr->sample_period = 1;
24 }
25
26 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
27 {
28         hw_breakpoint_init(attr);
29         attr->exclude_kernel = 1;
30 }
31
32 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
33 {
34         return bp->attr.bp_addr;
35 }
36
37 static inline int hw_breakpoint_type(struct perf_event *bp)
38 {
39         return bp->attr.bp_type;
40 }
41
42 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
43 {
44         return bp->attr.bp_len;
45 }
46
47 extern struct perf_event *
48 register_user_hw_breakpoint(struct perf_event_attr *attr,
49                             perf_overflow_handler_t triggered,
50                             void *context,
51                             struct task_struct *tsk);
52
53 /* FIXME: only change from the attr, and don't unregister */
54 extern int
55 modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
56 extern int
57 modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr,
58                                 bool check);
59
60 /*
61  * Kernel breakpoints are not associated with any particular thread.
62  */
63 extern struct perf_event *
64 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
65                                 perf_overflow_handler_t triggered,
66                                 void *context,
67                                 int cpu);
68
69 extern struct perf_event * __percpu *
70 register_wide_hw_breakpoint(struct perf_event_attr *attr,
71                             perf_overflow_handler_t triggered,
72                             void *context);
73
74 extern int register_perf_hw_breakpoint(struct perf_event *bp);
75 extern void unregister_hw_breakpoint(struct perf_event *bp);
76 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
77
78 extern int dbg_reserve_bp_slot(struct perf_event *bp);
79 extern int dbg_release_bp_slot(struct perf_event *bp);
80 extern int reserve_bp_slot(struct perf_event *bp);
81 extern void release_bp_slot(struct perf_event *bp);
82 int hw_breakpoint_weight(struct perf_event *bp);
83 int arch_reserve_bp_slot(struct perf_event *bp);
84 void arch_release_bp_slot(struct perf_event *bp);
85 void arch_unregister_hw_breakpoint(struct perf_event *bp);
86
87 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
88
89 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
90 {
91         return &bp->hw.info;
92 }
93
94 #else /* !CONFIG_HAVE_HW_BREAKPOINT */
95
96 static inline int __init init_hw_breakpoint(void) { return 0; }
97
98 static inline struct perf_event *
99 register_user_hw_breakpoint(struct perf_event_attr *attr,
100                             perf_overflow_handler_t triggered,
101                             void *context,
102                             struct task_struct *tsk)    { return NULL; }
103 static inline int
104 modify_user_hw_breakpoint(struct perf_event *bp,
105                           struct perf_event_attr *attr) { return -ENOSYS; }
106 static inline int
107 modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr,
108                                 bool check)     { return -ENOSYS; }
109
110 static inline struct perf_event *
111 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
112                                 perf_overflow_handler_t  triggered,
113                                 void *context,
114                                 int cpu)                { return NULL; }
115 static inline struct perf_event * __percpu *
116 register_wide_hw_breakpoint(struct perf_event_attr *attr,
117                             perf_overflow_handler_t triggered,
118                             void *context)              { return NULL; }
119 static inline int
120 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
121 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
122 static inline void
123 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
124 static inline int
125 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
126 static inline void release_bp_slot(struct perf_event *bp)               { }
127
128 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
129
130 static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp)
131 {
132         return NULL;
133 }
134
135 #endif /* CONFIG_HAVE_HW_BREAKPOINT */
136 #endif /* _LINUX_HW_BREAKPOINT_H */