[linux-2.6-block.git] / include / linux / hw_breakpoint.h

#ifndef _LINUX_HW_BREAKPOINT_H
#define _LINUX_HW_BREAKPOINT_H

enum {
	HW_BREAKPOINT_LEN_1 = 1,
	HW_BREAKPOINT_LEN_2 = 2,
	HW_BREAKPOINT_LEN_4 = 4,
	HW_BREAKPOINT_LEN_8 = 8,
};

enum {
	HW_BREAKPOINT_R = 1,
	HW_BREAKPOINT_W = 2,
	HW_BREAKPOINT_X = 4,
};

#ifdef __KERNEL__

#include <linux/perf_event.h>

#ifdef CONFIG_HAVE_HW_BREAKPOINT

/* As it's for in-kernel or ptrace use, we want it to be pinned */
#define DEFINE_BREAKPOINT_ATTR(name)	\
struct perf_event_attr name = {		\
	.type = PERF_TYPE_BREAKPOINT,	\
	.size = sizeof(name),		\
	.pinned = 1,			\
};

static inline void hw_breakpoint_init(struct perf_event_attr *attr)
{
	attr->type = PERF_TYPE_BREAKPOINT;
	attr->size = sizeof(*attr);
	attr->pinned = 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 int 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_callback_t triggered,
			    struct task_struct *tsk);

/* FIXME: only change from the attr, and don't unregister */
extern struct perf_event *
modify_user_hw_breakpoint(struct perf_event *bp,
			  struct perf_event_attr *attr,
			  perf_callback_t triggered,
			  struct task_struct *tsk);

/*
 * Kernel breakpoints are not associated with any particular thread.
 */
extern struct perf_event *
register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
				perf_callback_t triggered,
				int cpu);

extern struct perf_event **
register_wide_hw_breakpoint(struct perf_event_attr *attr,
			    perf_callback_t triggered);

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 **cpu_events);

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 struct perf_event *
register_user_hw_breakpoint(struct perf_event_attr *attr,
			    perf_callback_t triggered,
			    struct task_struct *tsk)	{ return NULL; }
static inline struct perf_event *
modify_user_hw_breakpoint(struct perf_event *bp,
			  struct perf_event_attr *attr,
			  perf_callback_t triggered,
			  struct task_struct *tsk)	{ return NULL; }
static inline struct perf_event *
register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
				perf_callback_t triggered,
				int cpu)		{ return NULL; }
static inline struct perf_event **
register_wide_hw_breakpoint(struct perf_event_attr *attr,
			    perf_callback_t triggered)	{ 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 **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 /* __KERNEL__ */

#endif /* _LINUX_HW_BREAKPOINT_H */
Commit	Line	Data
2da3e160 FW	1	#ifndef _LINUX_HW_BREAKPOINT_H
2da3e160 FW	2	#define _LINUX_HW_BREAKPOINT_H
b332828c	3
24f1e32c FW	4	enum {
	5	HW_BREAKPOINT_LEN_1 = 1,
	6	HW_BREAKPOINT_LEN_2 = 2,
	7	HW_BREAKPOINT_LEN_4 = 4,
	8	HW_BREAKPOINT_LEN_8 = 8,
b332828c P	9	};
b332828c P	10
24f1e32c FW	11	enum {
	12	HW_BREAKPOINT_R = 1,
	13	HW_BREAKPOINT_W = 2,
	14	HW_BREAKPOINT_X = 4,
	15	};
	16
5093ebad	17	#ifdef __KERNEL__
688bcaff	18
e6db4876 FW	19	#include <linux/perf_event.h>
e6db4876 FW	20
fa7c27ee FW	21	#ifdef CONFIG_HAVE_HW_BREAKPOINT
fa7c27ee FW	22
5fa10b28 FW	23	/* As it's for in-kernel or ptrace use, we want it to be pinned */
	24	#define DEFINE_BREAKPOINT_ATTR(name) \
	25	struct perf_event_attr name = { \
	26	.type = PERF_TYPE_BREAKPOINT, \
	27	.size = sizeof(name), \
	28	.pinned = 1, \
	29	};
	30
dd1853c3 FW	31	static inline void hw_breakpoint_init(struct perf_event_attr *attr)
	32	{
	33	attr->type = PERF_TYPE_BREAKPOINT;
	34	attr->size = sizeof(*attr);
	35	attr->pinned = 1;
	36	}
	37
24f1e32c FW	38	static inline unsigned long hw_breakpoint_addr(struct perf_event *bp)
	39	{
	40	return bp->attr.bp_addr;
	41	}
	42
	43	static inline int hw_breakpoint_type(struct perf_event *bp)
	44	{
	45	return bp->attr.bp_type;
	46	}
	47
	48	static inline int hw_breakpoint_len(struct perf_event *bp)
	49	{
	50	return bp->attr.bp_len;
	51	}
	52
24f1e32c	53	extern struct perf_event *
5fa10b28	54	register_user_hw_breakpoint(struct perf_event_attr *attr,
24f1e32c	55	perf_callback_t triggered,
5fa10b28	56	struct task_struct *tsk);
24f1e32c FW	57
	58	/* FIXME: only change from the attr, and don't unregister */
	59	extern struct perf_event *
	60	modify_user_hw_breakpoint(struct perf_event *bp,
5fa10b28	61	struct perf_event_attr *attr,
24f1e32c	62	perf_callback_t triggered,
5fa10b28	63	struct task_struct *tsk);
b332828c	64
b332828c P	65	/*
	66	* Kernel breakpoints are not associated with any particular thread.
	67	*/
24f1e32c	68	extern struct perf_event *
dd1853c3	69	register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
24f1e32c	70	perf_callback_t triggered,
dd1853c3	71	int cpu);
24f1e32c FW	72
24f1e32c FW	73	extern struct perf_event **
dd1853c3 FW	74	register_wide_hw_breakpoint(struct perf_event_attr *attr,
dd1853c3 FW	75	perf_callback_t triggered);
24f1e32c FW	76
	77	extern int register_perf_hw_breakpoint(struct perf_event *bp);
	78	extern int __register_perf_hw_breakpoint(struct perf_event *bp);
	79	extern void unregister_hw_breakpoint(struct perf_event *bp);
	80	extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
	81
	82	extern int reserve_bp_slot(struct perf_event *bp);
	83	extern void release_bp_slot(struct perf_event *bp);
	84
	85	extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
	86
687b16fb FW	87	static inline struct arch_hw_breakpoint counter_arch_bp(struct perf_event bp)
	88	{
	89	return &bp->hw.info;
	90	}
	91
24f1e32c FW	92	#else /* !CONFIG_HAVE_HW_BREAKPOINT */
	93
	94	static inline struct perf_event *
5fa10b28	95	register_user_hw_breakpoint(struct perf_event_attr *attr,
24f1e32c	96	perf_callback_t triggered,
5fa10b28	97	struct task_struct *tsk) { return NULL; }
24f1e32c FW	98	static inline struct perf_event *
24f1e32c FW	99	modify_user_hw_breakpoint(struct perf_event *bp,
5fa10b28	100	struct perf_event_attr *attr,
24f1e32c	101	perf_callback_t triggered,
5fa10b28	102	struct task_struct *tsk) { return NULL; }
24f1e32c	103	static inline struct perf_event *
dd1853c3	104	register_wide_hw_breakpoint_cpu(struct perf_event_attr *attr,
24f1e32c	105	perf_callback_t triggered,
dd1853c3	106	int cpu) { return NULL; }
24f1e32c	107	static inline struct perf_event **
dd1853c3 FW	108	register_wide_hw_breakpoint(struct perf_event_attr *attr,
dd1853c3 FW	109	perf_callback_t triggered) { return NULL; }
24f1e32c FW	110	static inline int
	111	register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
	112	static inline int
	113	__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
	114	static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
	115	static inline void
	116	unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
	117	static inline int
	118	reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
	119	static inline void release_bp_slot(struct perf_event *bp) { }
	120
	121	static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
b332828c	122
687b16fb FW	123	static inline struct arch_hw_breakpoint counter_arch_bp(struct perf_event bp)
	124	{
	125	return NULL;
	126	}
	127
24f1e32c	128	#endif /* CONFIG_HAVE_HW_BREAKPOINT */
5093ebad	129	#endif /* __KERNEL__ */
b332828c	130
24f1e32c	131	#endif /* _LINUX_HW_BREAKPOINT_H */