include/linux/hw_breakpoint.h

   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
   9 extern int __init init_hw_breakpoint(void);
  10
  11 static 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
  25 static inline void ptrace_breakpoint_init(struct perf_event_attr *attr)
  26 {
  27         hw_breakpoint_init(attr);
  28         attr->exclude_kernel = 1;
  29 }
  30
  31 static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
  32 {
  33         return bp->attr.bp_addr;
  34 }
  35
  36 static inline int hw_breakpoint_type(struct perf_event *bp)
  37 {
  38         return bp->attr.bp_type;
  39 }
  40
  41 static inline unsigned long hw_breakpoint_len(struct perf_event *bp)
  42 {
  43         return bp->attr.bp_len;
  44 }
  45
  46 extern struct perf_event *
  47 register_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 */
  53 extern int
  54 modify_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  */
  59 extern struct perf_event *
  60 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
  61                                 perf_overflow_handler_t triggered,
  62                                 void *context,
  63                                 int cpu);
  64
  65 extern struct perf_event * __percpu *
  66 register_wide_hw_breakpoint(struct perf_event_attr *attr,
  67                             perf_overflow_handler_t triggered,
  68                             void *context);
  69
  70 extern int register_perf_hw_breakpoint(struct perf_event *bp);
  71 extern int __register_perf_hw_breakpoint(struct perf_event *bp);
  72 extern void unregister_hw_breakpoint(struct perf_event *bp);
  73 extern void unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events);
  74
  75 extern int dbg_reserve_bp_slot(struct perf_event *bp);
  76 extern int dbg_release_bp_slot(struct perf_event *bp);
  77 extern int reserve_bp_slot(struct perf_event *bp);
  78 extern void release_bp_slot(struct perf_event *bp);
  79
  80 extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
  81
  82 static 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
  89 static inline int __init init_hw_breakpoint(void) { return 0; }
  90
  91 static inline struct perf_event *
  92 register_user_hw_breakpoint(struct perf_event_attr *attr,
  93                             perf_overflow_handler_t triggered,
  94                             void *context,
  95                             struct task_struct *tsk)    { return NULL; }
  96 static inline int
  97 modify_user_hw_breakpoint(struct perf_event *bp,
  98                           struct perf_event_attr *attr) { return -ENOSYS; }
  99 static inline struct perf_event *
 100 register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
 101                                 perf_overflow_handler_t  triggered,
 102                                 void *context,
 103                                 int cpu)                { return NULL; }
 104 static inline struct perf_event * __percpu *
 105 register_wide_hw_breakpoint(struct perf_event_attr *attr,
 106                             perf_overflow_handler_t triggered,
 107                             void *context)              { return NULL; }
 108 static inline int
 109 register_perf_hw_breakpoint(struct perf_event *bp)      { return -ENOSYS; }
 110 static inline int
 111 __register_perf_hw_breakpoint(struct perf_event *bp)    { return -ENOSYS; }
 112 static inline void unregister_hw_breakpoint(struct perf_event *bp)      { }
 113 static inline void
 114 unregister_wide_hw_breakpoint(struct perf_event * __percpu *cpu_events) { }
 115 static inline int
 116 reserve_bp_slot(struct perf_event *bp)                  {return -ENOSYS; }
 117 static inline void release_bp_slot(struct perf_event *bp)               { }
 118
 119 static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk)  { }
 120
 121 static 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 */