| /* 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); |
| extern int |
| modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, |
| bool check); |
| |
| /* |
| * 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 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); |
| int hw_breakpoint_weight(struct perf_event *bp); |
| int arch_reserve_bp_slot(struct perf_event *bp); |
| void arch_release_bp_slot(struct perf_event *bp); |
| void arch_unregister_hw_breakpoint(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 int |
| modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr, |
| bool check) { 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 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 */ |