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 | enum bp_type_idx { |
11 | TYPE_INST = 0, |
12 | #if defined(CONFIG_HAVE_MIXED_BREAKPOINTS_REGS) |
13 | TYPE_DATA = 0, |
14 | #else |
15 | TYPE_DATA = 1, |
16 | #endif |
17 | TYPE_MAX |
18 | }; |
19 | |
20 | extern int __init init_hw_breakpoint(void); |
21 | |
22 | static inline void hw_breakpoint_init(struct perf_event_attr *attr) |
23 | { |
24 | memset(attr, 0, sizeof(*attr)); |
25 | |
26 | attr->type = PERF_TYPE_BREAKPOINT; |
27 | attr->size = sizeof(*attr); |
28 | /* |
29 | * As it's for in-kernel or ptrace use, we want it to be pinned |
30 | * and to call its callback every hits. |
31 | */ |
32 | attr->pinned = 1; |
33 | attr->sample_period = 1; |
34 | } |
35 | |
36 | static inline void ptrace_breakpoint_init(struct perf_event_attr *attr) |
37 | { |
38 | hw_breakpoint_init(attr); |
39 | attr->exclude_kernel = 1; |
40 | } |
41 | |
42 | static inline unsigned long hw_breakpoint_addr(struct perf_event *bp) |
43 | { |
44 | return bp->attr.bp_addr; |
45 | } |
46 | |
47 | static inline int hw_breakpoint_type(struct perf_event *bp) |
48 | { |
49 | return bp->attr.bp_type; |
50 | } |
51 | |
52 | static inline unsigned long hw_breakpoint_len(struct perf_event *bp) |
53 | { |
54 | return bp->attr.bp_len; |
55 | } |
56 | |
57 | extern struct perf_event * |
58 | register_user_hw_breakpoint(struct perf_event_attr *attr, |
59 | perf_overflow_handler_t triggered, |
60 | void *context, |
61 | struct task_struct *tsk); |
62 | |
63 | /* FIXME: only change from the attr, and don't unregister */ |
64 | extern int |
65 | modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr); |
66 | extern int |
67 | modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, |
68 | bool check); |
69 | |
70 | /* |
71 | * Kernel breakpoints are not associated with any particular thread. |
72 | */ |
73 | extern struct perf_event * |
74 | register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, |
75 | perf_overflow_handler_t triggered, |
76 | void *context, |
77 | int cpu); |
78 | |
79 | extern struct perf_event * __percpu * |
80 | register_wide_hw_breakpoint(struct perf_event_attr *attr, |
81 | perf_overflow_handler_t triggered, |
82 | void *context); |
83 | |
84 | extern int register_perf_hw_breakpoint(struct perf_event *bp); |
85 | extern void unregister_hw_breakpoint(struct perf_event *bp); |
86 | extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events); |
87 | extern bool hw_breakpoint_is_used(void); |
88 | |
89 | extern int dbg_reserve_bp_slot(struct perf_event *bp); |
90 | extern int dbg_release_bp_slot(struct perf_event *bp); |
91 | extern int reserve_bp_slot(struct perf_event *bp); |
92 | extern void release_bp_slot(struct perf_event *bp); |
93 | |
94 | extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk); |
95 | |
96 | static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) |
97 | { |
98 | return &bp->hw.info; |
99 | } |
100 | |
101 | #else /* !CONFIG_HAVE_HW_BREAKPOINT */ |
102 | |
103 | static inline int __init init_hw_breakpoint(void) { return 0; } |
104 | |
105 | static inline struct perf_event * |
106 | register_user_hw_breakpoint(struct perf_event_attr *attr, |
107 | perf_overflow_handler_t triggered, |
108 | void *context, |
109 | struct task_struct *tsk) { return NULL; } |
110 | static inline int |
111 | modify_user_hw_breakpoint(struct perf_event *bp, |
112 | struct perf_event_attr *attr) { return -ENOSYS; } |
113 | static inline int |
114 | modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, |
115 | bool check) { return -ENOSYS; } |
116 | |
117 | static inline struct perf_event * |
118 | register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr, |
119 | perf_overflow_handler_t triggered, |
120 | void *context, |
121 | int cpu) { return NULL; } |
122 | static inline struct perf_event * __percpu * |
123 | register_wide_hw_breakpoint(struct perf_event_attr *attr, |
124 | perf_overflow_handler_t triggered, |
125 | void *context) { return NULL; } |
126 | static inline int |
127 | register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; } |
128 | static inline void unregister_hw_breakpoint(struct perf_event *bp) { } |
129 | static inline void |
130 | unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { } |
131 | static inline bool hw_breakpoint_is_used(void) { return false; } |
132 | |
133 | static inline int |
134 | reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; } |
135 | static inline void release_bp_slot(struct perf_event *bp) { } |
136 | |
137 | static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { } |
138 | |
139 | static inline struct arch_hw_breakpoint *counter_arch_bp(struct perf_event *bp) |
140 | { |
141 | return NULL; |
142 | } |
143 | |
144 | #endif /* CONFIG_HAVE_HW_BREAKPOINT */ |
145 | #endif /* _LINUX_HW_BREAKPOINT_H */ |
146 | |