cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hw_breakpoint.h (4248B)

      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
     10extern int __init init_hw_breakpoint(void);
     11
     12static 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
     26static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
     27{
     28	hw_breakpoint_init(attr);
     29	attr->exclude_kernel = 1;
     30}
     31
     32static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
     33{
     34	return bp->attr.bp_addr;
     35}
     36
     37static inline int hw_breakpoint_type(struct perf_event *bp)
     38{
     39	return bp->attr.bp_type;
     40}
     41
     42static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
     43{
     44	return bp->attr.bp_len;
     45}
     46
     47extern struct perf_event *
     48register_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 */
     54extern int
     55modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *attr);
     56extern int
     57modify_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 */
     63extern struct perf_event *
     64register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
     65				perf_overflow_handler_t	triggered,
     66				void *context,
     67				int cpu);
     68
     69extern struct perf_event * __percpu *
     70register_wide_hw_breakpoint(struct perf_event_attr *attr,
     71			    perf_overflow_handler_t triggered,
     72			    void *context);
     73
     74extern int register_perf_hw_breakpoint(struct perf_event *bp);
     75extern void unregister_hw_breakpoint(struct perf_event *bp);
     76extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
     77
     78extern int dbg_reserve_bp_slot(struct perf_event *bp);
     79extern int dbg_release_bp_slot(struct perf_event *bp);
     80extern int reserve_bp_slot(struct perf_event *bp);
     81extern void release_bp_slot(struct perf_event *bp);
     82int hw_breakpoint_weight(struct perf_event *bp);
     83int arch_reserve_bp_slot(struct perf_event *bp);
     84void arch_release_bp_slot(struct perf_event *bp);
     85void arch_unregister_hw_breakpoint(struct perf_event *bp);
     86
     87extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
     88
     89static 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
     96static inline int __init init_hw_breakpoint(void) { return 0; }
     97
     98static inline struct perf_event *
     99register_user_hw_breakpoint(struct perf_event_attr *attr,
    100			    perf_overflow_handler_t triggered,
    101			    void *context,
    102			    struct task_struct *tsk)	{ return NULL; }
    103static inline int
    104modify_user_hw_breakpoint(struct perf_event *bp,
    105			  struct perf_event_attr *attr)	{ return -ENOSYS; }
    106static inline int
    107modify_user_hw_breakpoint_check(struct perf_event *bp, struct perf_event_attr *attr,
    108				bool check)	{ return -ENOSYS; }
    109
    110static inline struct perf_event *
    111register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
    112				perf_overflow_handler_t	 triggered,
    113				void *context,
    114				int cpu)		{ return NULL; }
    115static inline struct perf_event * __percpu *
    116register_wide_hw_breakpoint(struct perf_event_attr *attr,
    117			    perf_overflow_handler_t triggered,
    118			    void *context)		{ return NULL; }
    119static inline int
    120register_perf_hw_breakpoint(struct perf_event *bp)	{ return -ENOSYS; }
    121static inline void unregister_hw_breakpoint(struct perf_event *bp)	{ }
    122static inline void
    123unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events)	{ }
    124static inline int
    125reserve_bp_slot(struct perf_event *bp)			{return -ENOSYS; }
    126static inline void release_bp_slot(struct perf_event *bp) 		{ }
    127
    128static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)	{ }
    129
    130static 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 */