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