LXR linux/include/linux/hw

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