[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 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(unsigned long addr,
				int len,
				int type,
				perf_callback_t triggered,
				int cpu,
				bool active);

extern struct perf_event **
register_wide_hw_breakpoint(unsigned long addr,
			    int len,
			    int type,
			    perf_callback_t triggered,
			    bool active);

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(unsigned long addr,
				int len,
				int type,
				perf_callback_t triggered,
				int cpu,
				bool active)		{ return NULL; }
static inline struct perf_event **
register_wide_hw_breakpoint(unsigned long addr,
			    int len,
			    int type,
			    perf_callback_t triggered,
			    bool active)		{ 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
24f1e32c FW	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 int hw_breakpoint_len(struct perf_event *bp)
	42	{
	43	return bp->attr.bp_len;
	44	}
	45
24f1e32c	46	extern struct perf_event *
5fa10b28	47	register_user_hw_breakpoint(struct perf_event_attr *attr,
24f1e32c	48	perf_callback_t triggered,
5fa10b28	49	struct task_struct *tsk);
24f1e32c FW	50
	51	/* FIXME: only change from the attr, and don't unregister */
	52	extern struct perf_event *
	53	modify_user_hw_breakpoint(struct perf_event *bp,
5fa10b28	54	struct perf_event_attr *attr,
24f1e32c	55	perf_callback_t triggered,
5fa10b28	56	struct task_struct *tsk);
b332828c	57
b332828c P	58	/*
	59	* Kernel breakpoints are not associated with any particular thread.
	60	*/
24f1e32c FW	61	extern struct perf_event *
	62	register_wide_hw_breakpoint_cpu(unsigned long addr,
	63	int len,
	64	int type,
	65	perf_callback_t triggered,
	66	int cpu,
	67	bool active);
	68
	69	extern struct perf_event **
	70	register_wide_hw_breakpoint(unsigned long addr,
	71	int len,
	72	int type,
	73	perf_callback_t triggered,
	74	bool active);
	75
	76	extern int register_perf_hw_breakpoint(struct perf_event *bp);
	77	extern int __register_perf_hw_breakpoint(struct perf_event *bp);
	78	extern void unregister_hw_breakpoint(struct perf_event *bp);
	79	extern void unregister_wide_hw_breakpoint(struct perf_event **cpu_events);
	80
	81	extern int reserve_bp_slot(struct perf_event *bp);
	82	extern void release_bp_slot(struct perf_event *bp);
	83
	84	extern void flush_ptrace_hw_breakpoint(struct task_struct *tsk);
	85
687b16fb FW	86	static inline struct arch_hw_breakpoint counter_arch_bp(struct perf_event bp)
	87	{
	88	return &bp->hw.info;
	89	}
	90
24f1e32c FW	91	#else /* !CONFIG_HAVE_HW_BREAKPOINT */
	92
	93	static inline struct perf_event *
5fa10b28	94	register_user_hw_breakpoint(struct perf_event_attr *attr,
24f1e32c	95	perf_callback_t triggered,
5fa10b28	96	struct task_struct *tsk) { return NULL; }
24f1e32c FW	97	static inline struct perf_event *
24f1e32c FW	98	modify_user_hw_breakpoint(struct perf_event *bp,
5fa10b28	99	struct perf_event_attr *attr,
24f1e32c	100	perf_callback_t triggered,
5fa10b28	101	struct task_struct *tsk) { return NULL; }
24f1e32c FW	102	static inline struct perf_event *
	103	register_wide_hw_breakpoint_cpu(unsigned long addr,
	104	int len,
	105	int type,
	106	perf_callback_t triggered,
	107	int cpu,
	108	bool active) { return NULL; }
	109	static inline struct perf_event **
	110	register_wide_hw_breakpoint(unsigned long addr,
	111	int len,
	112	int type,
	113	perf_callback_t triggered,
	114	bool active) { return NULL; }
	115	static inline int
	116	register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
	117	static inline int
	118	__register_perf_hw_breakpoint(struct perf_event *bp) { return -ENOSYS; }
	119	static inline void unregister_hw_breakpoint(struct perf_event *bp) { }
	120	static inline void
	121	unregister_wide_hw_breakpoint(struct perf_event **cpu_events) { }
	122	static inline int
	123	reserve_bp_slot(struct perf_event *bp) {return -ENOSYS; }
	124	static inline void release_bp_slot(struct perf_event *bp) { }
	125
	126	static inline void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { }
b332828c	127
687b16fb FW	128	static inline struct arch_hw_breakpoint counter_arch_bp(struct perf_event bp)
	129	{
	130	return NULL;
	131	}
	132
24f1e32c	133	#endif /* CONFIG_HAVE_HW_BREAKPOINT */
5093ebad	134	#endif /* __KERNEL__ */
b332828c	135
24f1e32c	136	#endif /* _LINUX_HW_BREAKPOINT_H */