include/linux/perf_counter.h - kernel/msm-4.9 - Gitiles

 /*
  *  Performance counters:
  *
  *   Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
  *   Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
  *
  *  Data type definitions, declarations, prototypes.
  *
  *  Started by: Thomas Gleixner and Ingo Molnar
  *
  *  For licencing details see kernel-base/COPYING
  */
 #ifndef _LINUX_PERF_COUNTER_H
 #define _LINUX_PERF_COUNTER_H

 #include <linux/types.h>
 #include <linux/ioctl.h>
 #include <asm/byteorder.h>

 /*
  * User-space ABI bits:
  */

 /*
  * hw_event.type
  */
 enum perf_event_types {
 	PERF_TYPE_HARDWARE		= 0,
 	PERF_TYPE_SOFTWARE		= 1,
 	PERF_TYPE_TRACEPOINT		= 2,

 	/*
 	 * available TYPE space, raw is the max value.
 	 */

 	PERF_TYPE_RAW			= 128,
 };

 /*
  * Generalized performance counter event types, used by the hw_event.event_id
  * parameter of the sys_perf_counter_open() syscall:
  */
 enum hw_event_ids {
 	/*
 	 * Common hardware events, generalized by the kernel:
 	 */
 	PERF_COUNT_CPU_CYCLES		= 0,
 	PERF_COUNT_INSTRUCTIONS		= 1,
 	PERF_COUNT_CACHE_REFERENCES	= 2,
 	PERF_COUNT_CACHE_MISSES		= 3,
 	PERF_COUNT_BRANCH_INSTRUCTIONS	= 4,
 	PERF_COUNT_BRANCH_MISSES	= 5,
 	PERF_COUNT_BUS_CYCLES		= 6,

 	PERF_HW_EVENTS_MAX		= 7,
 };

 /*
  * Special "software" counters provided by the kernel, even if the hardware
  * does not support performance counters. These counters measure various
  * physical and sw events of the kernel (and allow the profiling of them as
  * well):
  */
 enum sw_event_ids {
 	PERF_COUNT_CPU_CLOCK		= 0,
 	PERF_COUNT_TASK_CLOCK		= 1,
 	PERF_COUNT_PAGE_FAULTS		= 2,
 	PERF_COUNT_CONTEXT_SWITCHES	= 3,
 	PERF_COUNT_CPU_MIGRATIONS	= 4,
 	PERF_COUNT_PAGE_FAULTS_MIN	= 5,
 	PERF_COUNT_PAGE_FAULTS_MAJ	= 6,

 	PERF_SW_EVENTS_MAX		= 7,
 };

 /*
  * IRQ-notification data record type:
  */
 enum perf_counter_record_type {
 	PERF_RECORD_SIMPLE		= 0,
 	PERF_RECORD_IRQ			= 1,
 	PERF_RECORD_GROUP		= 2,
 };

 #define __PERF_COUNTER_MASK(name) 			\
 	(((1ULL << PERF_COUNTER_##name##_BITS) - 1) <<	\
 	 PERF_COUNTER_##name##_SHIFT)

 #define PERF_COUNTER_RAW_BITS		1
 #define PERF_COUNTER_RAW_SHIFT		63
 #define PERF_COUNTER_RAW_MASK		__PERF_COUNTER_MASK(RAW)

 #define PERF_COUNTER_CONFIG_BITS	63
 #define PERF_COUNTER_CONFIG_SHIFT	0
 #define PERF_COUNTER_CONFIG_MASK	__PERF_COUNTER_MASK(CONFIG)

 #define PERF_COUNTER_TYPE_BITS		7
 #define PERF_COUNTER_TYPE_SHIFT		56
 #define PERF_COUNTER_TYPE_MASK		__PERF_COUNTER_MASK(TYPE)

 #define PERF_COUNTER_EVENT_BITS		56
 #define PERF_COUNTER_EVENT_SHIFT	0
 #define PERF_COUNTER_EVENT_MASK		__PERF_COUNTER_MASK(EVENT)

 /*
  * Hardware event to monitor via a performance monitoring counter:
  */
 struct perf_counter_hw_event {
 	/*
 	 * The MSB of the config word signifies if the rest contains cpu
 	 * specific (raw) counter configuration data, if unset, the next
 	 * 7 bits are an event type and the rest of the bits are the event
 	 * identifier.
 	 */
 	__u64			config;

 	__u64			irq_period;
 	__u64			record_type;
 	__u64			read_format;

 	__u64			disabled       :  1, /* off by default        */
 				nmi	       :  1, /* NMI sampling          */
 				inherit	       :  1, /* children inherit it   */
 				pinned	       :  1, /* must always be on PMU */
 				exclusive      :  1, /* only group on PMU     */
 				exclude_user   :  1, /* don't count user      */
 				exclude_kernel :  1, /* ditto kernel          */
 				exclude_hv     :  1, /* ditto hypervisor      */
 				exclude_idle   :  1, /* don't count when idle */
 				include_tid    :  1, /* include the tid */

 				__reserved_1   : 54;

 	__u32			extra_config_len;
 	__u32			__reserved_4;

 	__u64			__reserved_2;
 	__u64			__reserved_3;
 };

 /*
  * Ioctls that can be done on a perf counter fd:
  */
 #define PERF_COUNTER_IOC_ENABLE		_IO('$', 0)
 #define PERF_COUNTER_IOC_DISABLE	_IO('$', 1)

 /*
  * Structure of the page that can be mapped via mmap
  */
 struct perf_counter_mmap_page {
 	__u32	version;		/* version number of this structure */
 	__u32	compat_version;		/* lowest version this is compat with */
 	__u32	lock;			/* seqlock for synchronization */
 	__u32	index;			/* hardware counter identifier */
 	__s64	offset;			/* add to hardware counter value */

 	__u32   data_head;		/* head in the data section */
 };

 struct perf_event_header {
 	__u32	type;
 	__u32	size;
 };

 enum perf_event_type {
 	PERF_EVENT_IP		= 0,
 	PERF_EVENT_GROUP	= 1,

 	__PERF_EVENT_TID	= 0x100,
 };

 #ifdef __KERNEL__
 /*
  * Kernel-internal data types and definitions:
  */

 #ifdef CONFIG_PERF_COUNTERS
 # include <asm/perf_counter.h>
 #endif

 #include <linux/list.h>
 #include <linux/mutex.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/spinlock.h>
 #include <linux/hrtimer.h>
 #include <asm/atomic.h>

 struct task_struct;

 static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
 {
 	return hw_event->config & PERF_COUNTER_RAW_MASK;
 }

 static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
 {
 	return hw_event->config & PERF_COUNTER_CONFIG_MASK;
 }

 static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
 {
 	return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
 		PERF_COUNTER_TYPE_SHIFT;
 }

 static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
 {
 	return hw_event->config & PERF_COUNTER_EVENT_MASK;
 }

 /**
  * struct hw_perf_counter - performance counter hardware details:
  */
 struct hw_perf_counter {
 #ifdef CONFIG_PERF_COUNTERS
 	union {
 		struct { /* hardware */
 			u64				config;
 			unsigned long			config_base;
 			unsigned long			counter_base;
 			int				nmi;
 			unsigned int			idx;
 		};
 		union { /* software */
 			atomic64_t			count;
 			struct hrtimer			hrtimer;
 		};
 	};
 	atomic64_t			prev_count;
 	u64				irq_period;
 	atomic64_t			period_left;
 #endif
 };

 struct perf_counter;

 /**
  * struct hw_perf_counter_ops - performance counter hw ops
  */
 struct hw_perf_counter_ops {
 	int (*enable)			(struct perf_counter *counter);
 	void (*disable)			(struct perf_counter *counter);
 	void (*read)			(struct perf_counter *counter);
 };

 /**
  * enum perf_counter_active_state - the states of a counter
  */
 enum perf_counter_active_state {
 	PERF_COUNTER_STATE_ERROR	= -2,
 	PERF_COUNTER_STATE_OFF		= -1,
 	PERF_COUNTER_STATE_INACTIVE	=  0,
 	PERF_COUNTER_STATE_ACTIVE	=  1,
 };

 struct file;

 struct perf_mmap_data {
 	struct rcu_head			rcu_head;
 	int				nr_pages;
 	atomic_t			wakeup;
 	atomic_t			head;
 	struct perf_counter_mmap_page   *user_page;
 	void 				*data_pages[0];
 };

 /**
  * struct perf_counter - performance counter kernel representation:
  */
 struct perf_counter {
 #ifdef CONFIG_PERF_COUNTERS
 	struct list_head		list_entry;
 	struct list_head		event_entry;
 	struct list_head		sibling_list;
 	int 				nr_siblings;
 	struct perf_counter		*group_leader;
 	const struct hw_perf_counter_ops *hw_ops;

 	enum perf_counter_active_state	state;
 	enum perf_counter_active_state	prev_state;
 	atomic64_t			count;

 	struct perf_counter_hw_event	hw_event;
 	struct hw_perf_counter		hw;

 	struct perf_counter_context	*ctx;
 	struct task_struct		*task;
 	struct file			*filp;

 	struct perf_counter		*parent;
 	struct list_head		child_list;

 	/*
 	 * Protect attach/detach and child_list:
 	 */
 	struct mutex			mutex;

 	int				oncpu;
 	int				cpu;

 	/* mmap bits */
 	struct mutex			mmap_mutex;
 	atomic_t			mmap_count;
 	struct perf_mmap_data		*data;

 	/* poll related */
 	wait_queue_head_t		waitq;
 	/* optional: for NMIs */
 	int				wakeup_pending;

 	void (*destroy)(struct perf_counter *);
 	struct rcu_head			rcu_head;
 #endif
 };

 /**
  * struct perf_counter_context - counter context structure
  *
  * Used as a container for task counters and CPU counters as well:
  */
 struct perf_counter_context {
 #ifdef CONFIG_PERF_COUNTERS
 	/*
 	 * Protect the states of the counters in the list,
 	 * nr_active, and the list:
 	 */
 	spinlock_t		lock;
 	/*
 	 * Protect the list of counters.  Locking either mutex or lock
 	 * is sufficient to ensure the list doesn't change; to change
 	 * the list you need to lock both the mutex and the spinlock.
 	 */
 	struct mutex		mutex;

 	struct list_head	counter_list;
 	struct list_head	event_list;
 	int			nr_counters;
 	int			nr_active;
 	int			is_active;
 	struct task_struct	*task;
 #endif
 };

 /**
  * struct perf_counter_cpu_context - per cpu counter context structure
  */
 struct perf_cpu_context {
 	struct perf_counter_context	ctx;
 	struct perf_counter_context	*task_ctx;
 	int				active_oncpu;
 	int				max_pertask;
 	int				exclusive;

 	/*
 	 * Recursion avoidance:
 	 *
 	 * task, softirq, irq, nmi context
 	 */
 	int			recursion[4];
 };

 /*
  * Set by architecture code:
  */
 extern int perf_max_counters;

 #ifdef CONFIG_PERF_COUNTERS
 extern const struct hw_perf_counter_ops *
 hw_perf_counter_init(struct perf_counter *counter);

 extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
 extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
 extern void perf_counter_task_tick(struct task_struct *task, int cpu);
 extern void perf_counter_init_task(struct task_struct *child);
 extern void perf_counter_exit_task(struct task_struct *child);
 extern void perf_counter_notify(struct pt_regs *regs);
 extern void perf_counter_print_debug(void);
 extern void perf_counter_unthrottle(void);
 extern u64 hw_perf_save_disable(void);
 extern void hw_perf_restore(u64 ctrl);
 extern int perf_counter_task_disable(void);
 extern int perf_counter_task_enable(void);
 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
 	       struct perf_cpu_context *cpuctx,
 	       struct perf_counter_context *ctx, int cpu);
 extern void perf_counter_update_userpage(struct perf_counter *counter);

 extern void perf_counter_output(struct perf_counter *counter,
 				int nmi, struct pt_regs *regs);
 /*
  * Return 1 for a software counter, 0 for a hardware counter
  */
 static inline int is_software_counter(struct perf_counter *counter)
 {
 	return !perf_event_raw(&counter->hw_event) &&
 		perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
 }

 extern void perf_swcounter_event(u32, u64, int, struct pt_regs *);

 #else
 static inline void
 perf_counter_task_sched_in(struct task_struct *task, int cpu)		{ }
 static inline void
 perf_counter_task_sched_out(struct task_struct *task, int cpu)		{ }
 static inline void
 perf_counter_task_tick(struct task_struct *task, int cpu)		{ }
 static inline void perf_counter_init_task(struct task_struct *child)	{ }
 static inline void perf_counter_exit_task(struct task_struct *child)	{ }
 static inline void perf_counter_notify(struct pt_regs *regs)		{ }
 static inline void perf_counter_print_debug(void)			{ }
 static inline void perf_counter_unthrottle(void)			{ }
 static inline void hw_perf_restore(u64 ctrl)				{ }
 static inline u64 hw_perf_save_disable(void)		      { return 0; }
 static inline int perf_counter_task_disable(void)	{ return -EINVAL; }
 static inline int perf_counter_task_enable(void)	{ return -EINVAL; }

 static inline void perf_swcounter_event(u32 event, u64 nr,
 					int nmi, struct pt_regs *regs)	{ }
 #endif

 #endif /* __KERNEL__ */
 #endif /* _LINUX_PERF_COUNTER_H */
	/*
	* Performance counters:
	*
	* Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
	* Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
	*
	* Data type definitions, declarations, prototypes.
	*
	* Started by: Thomas Gleixner and Ingo Molnar
	*
	* For licencing details see kernel-base/COPYING
	*/
	#ifndef _LINUX_PERF_COUNTER_H
	#define _LINUX_PERF_COUNTER_H

	#include <linux/types.h>
	#include <linux/ioctl.h>
	#include <asm/byteorder.h>

	/*
	* User-space ABI bits:
	*/

	/*
	* hw_event.type
	*/
	enum perf_event_types {
	PERF_TYPE_HARDWARE = 0,
	PERF_TYPE_SOFTWARE = 1,
	PERF_TYPE_TRACEPOINT = 2,

	/*
	* available TYPE space, raw is the max value.
	*/

	PERF_TYPE_RAW = 128,
	};

	/*
	* Generalized performance counter event types, used by the hw_event.event_id
	* parameter of the sys_perf_counter_open() syscall:
	*/
	enum hw_event_ids {
	/*
	* Common hardware events, generalized by the kernel:
	*/
	PERF_COUNT_CPU_CYCLES = 0,
	PERF_COUNT_INSTRUCTIONS = 1,
	PERF_COUNT_CACHE_REFERENCES = 2,
	PERF_COUNT_CACHE_MISSES = 3,
	PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
	PERF_COUNT_BRANCH_MISSES = 5,
	PERF_COUNT_BUS_CYCLES = 6,

	PERF_HW_EVENTS_MAX = 7,
	};

	/*
	* Special "software" counters provided by the kernel, even if the hardware
	* does not support performance counters. These counters measure various
	* physical and sw events of the kernel (and allow the profiling of them as
	* well):
	*/
	enum sw_event_ids {
	PERF_COUNT_CPU_CLOCK = 0,
	PERF_COUNT_TASK_CLOCK = 1,
	PERF_COUNT_PAGE_FAULTS = 2,
	PERF_COUNT_CONTEXT_SWITCHES = 3,
	PERF_COUNT_CPU_MIGRATIONS = 4,
	PERF_COUNT_PAGE_FAULTS_MIN = 5,
	PERF_COUNT_PAGE_FAULTS_MAJ = 6,

	PERF_SW_EVENTS_MAX = 7,
	};

	/*
	* IRQ-notification data record type:
	*/
	enum perf_counter_record_type {
	PERF_RECORD_SIMPLE = 0,
	PERF_RECORD_IRQ = 1,
	PERF_RECORD_GROUP = 2,
	};

	#define __PERF_COUNTER_MASK(name) \
	(((1ULL << PERF_COUNTER_##name##_BITS) - 1) << \
	PERF_COUNTER_##name##_SHIFT)

	#define PERF_COUNTER_RAW_BITS 1
	#define PERF_COUNTER_RAW_SHIFT 63
	#define PERF_COUNTER_RAW_MASK __PERF_COUNTER_MASK(RAW)

	#define PERF_COUNTER_CONFIG_BITS 63
	#define PERF_COUNTER_CONFIG_SHIFT 0
	#define PERF_COUNTER_CONFIG_MASK __PERF_COUNTER_MASK(CONFIG)

	#define PERF_COUNTER_TYPE_BITS 7
	#define PERF_COUNTER_TYPE_SHIFT 56
	#define PERF_COUNTER_TYPE_MASK __PERF_COUNTER_MASK(TYPE)

	#define PERF_COUNTER_EVENT_BITS 56
	#define PERF_COUNTER_EVENT_SHIFT 0
	#define PERF_COUNTER_EVENT_MASK __PERF_COUNTER_MASK(EVENT)

	/*
	* Hardware event to monitor via a performance monitoring counter:
	*/
	struct perf_counter_hw_event {
	/*
	* The MSB of the config word signifies if the rest contains cpu
	* specific (raw) counter configuration data, if unset, the next
	* 7 bits are an event type and the rest of the bits are the event
	* identifier.
	*/
	__u64 config;

	__u64 irq_period;
	__u64 record_type;
	__u64 read_format;

	__u64 disabled : 1, /* off by default */
	nmi : 1, /* NMI sampling */
	inherit : 1, /* children inherit it */
	pinned : 1, /* must always be on PMU */
	exclusive : 1, /* only group on PMU */
	exclude_user : 1, /* don't count user */
	exclude_kernel : 1, /* ditto kernel */
	exclude_hv : 1, /* ditto hypervisor */
	exclude_idle : 1, /* don't count when idle */
	include_tid : 1, /* include the tid */

	__reserved_1 : 54;

	__u32 extra_config_len;
	__u32 __reserved_4;

	__u64 __reserved_2;
	__u64 __reserved_3;
	};

	/*
	* Ioctls that can be done on a perf counter fd:
	*/
	#define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
	#define PERF_COUNTER_IOC_DISABLE _IO('$', 1)

	/*
	* Structure of the page that can be mapped via mmap
	*/
	struct perf_counter_mmap_page {
	__u32 version; /* version number of this structure */
	__u32 compat_version; /* lowest version this is compat with */
	__u32 lock; /* seqlock for synchronization */
	__u32 index; /* hardware counter identifier */
	__s64 offset; /* add to hardware counter value */

	__u32 data_head; /* head in the data section */
	};

	struct perf_event_header {
	__u32 type;
	__u32 size;
	};

	enum perf_event_type {
	PERF_EVENT_IP = 0,
	PERF_EVENT_GROUP = 1,

	__PERF_EVENT_TID = 0x100,
	};

	#ifdef __KERNEL__
	/*
	* Kernel-internal data types and definitions:
	*/

	#ifdef CONFIG_PERF_COUNTERS
	# include <asm/perf_counter.h>
	#endif

	#include <linux/list.h>
	#include <linux/mutex.h>
	#include <linux/rculist.h>
	#include <linux/rcupdate.h>
	#include <linux/spinlock.h>
	#include <linux/hrtimer.h>
	#include <asm/atomic.h>

	struct task_struct;

	static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
	{
	return hw_event->config & PERF_COUNTER_RAW_MASK;
	}

	static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
	{
	return hw_event->config & PERF_COUNTER_CONFIG_MASK;
	}

	static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
	{
	return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
	PERF_COUNTER_TYPE_SHIFT;
	}

	static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
	{
	return hw_event->config & PERF_COUNTER_EVENT_MASK;
	}

	/**
	* struct hw_perf_counter - performance counter hardware details:
	*/
	struct hw_perf_counter {
	#ifdef CONFIG_PERF_COUNTERS
	union {
	struct { /* hardware */
	u64 config;
	unsigned long config_base;
	unsigned long counter_base;
	int nmi;
	unsigned int idx;
	};
	union { /* software */
	atomic64_t count;
	struct hrtimer hrtimer;
	};
	};
	atomic64_t prev_count;
	u64 irq_period;
	atomic64_t period_left;
	#endif
	};

	struct perf_counter;

	/**
	* struct hw_perf_counter_ops - performance counter hw ops
	*/
	struct hw_perf_counter_ops {
	int (enable) (struct perf_counter counter);
	void (disable) (struct perf_counter counter);
	void (read) (struct perf_counter counter);
	};

	/**
	* enum perf_counter_active_state - the states of a counter
	*/
	enum perf_counter_active_state {
	PERF_COUNTER_STATE_ERROR = -2,
	PERF_COUNTER_STATE_OFF = -1,
	PERF_COUNTER_STATE_INACTIVE = 0,
	PERF_COUNTER_STATE_ACTIVE = 1,
	};

	struct file;

	struct perf_mmap_data {
	struct rcu_head rcu_head;
	int nr_pages;
	atomic_t wakeup;
	atomic_t head;
	struct perf_counter_mmap_page *user_page;
	void *data_pages[0];
	};

	/**
	* struct perf_counter - performance counter kernel representation:
	*/
	struct perf_counter {
	#ifdef CONFIG_PERF_COUNTERS
	struct list_head list_entry;
	struct list_head event_entry;
	struct list_head sibling_list;
	int nr_siblings;
	struct perf_counter *group_leader;
	const struct hw_perf_counter_ops *hw_ops;

	enum perf_counter_active_state state;
	enum perf_counter_active_state prev_state;
	atomic64_t count;

	struct perf_counter_hw_event hw_event;
	struct hw_perf_counter hw;

	struct perf_counter_context *ctx;
	struct task_struct *task;
	struct file *filp;

	struct perf_counter *parent;
	struct list_head child_list;

	/*
	* Protect attach/detach and child_list:
	*/
	struct mutex mutex;

	int oncpu;
	int cpu;

	/* mmap bits */
	struct mutex mmap_mutex;
	atomic_t mmap_count;
	struct perf_mmap_data *data;

	/* poll related */
	wait_queue_head_t waitq;
	/* optional: for NMIs */
	int wakeup_pending;

	void (destroy)(struct perf_counter );
	struct rcu_head rcu_head;
	#endif
	};

	/**
	* struct perf_counter_context - counter context structure
	*
	* Used as a container for task counters and CPU counters as well:
	*/
	struct perf_counter_context {
	#ifdef CONFIG_PERF_COUNTERS
	/*
	* Protect the states of the counters in the list,
	* nr_active, and the list:
	*/
	spinlock_t lock;
	/*
	* Protect the list of counters. Locking either mutex or lock
	* is sufficient to ensure the list doesn't change; to change
	* the list you need to lock both the mutex and the spinlock.
	*/
	struct mutex mutex;

	struct list_head counter_list;
	struct list_head event_list;
	int nr_counters;
	int nr_active;
	int is_active;
	struct task_struct *task;
	#endif
	};

	/**
	* struct perf_counter_cpu_context - per cpu counter context structure
	*/
	struct perf_cpu_context {
	struct perf_counter_context ctx;
	struct perf_counter_context *task_ctx;
	int active_oncpu;
	int max_pertask;
	int exclusive;

	/*
	* Recursion avoidance:
	*
	* task, softirq, irq, nmi context
	*/
	int recursion[4];
	};

	/*
	* Set by architecture code:
	*/
	extern int perf_max_counters;

	#ifdef CONFIG_PERF_COUNTERS
	extern const struct hw_perf_counter_ops *
	hw_perf_counter_init(struct perf_counter *counter);

	extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
	extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
	extern void perf_counter_task_tick(struct task_struct *task, int cpu);
	extern void perf_counter_init_task(struct task_struct *child);
	extern void perf_counter_exit_task(struct task_struct *child);
	extern void perf_counter_notify(struct pt_regs *regs);
	extern void perf_counter_print_debug(void);
	extern void perf_counter_unthrottle(void);
	extern u64 hw_perf_save_disable(void);
	extern void hw_perf_restore(u64 ctrl);
	extern int perf_counter_task_disable(void);
	extern int perf_counter_task_enable(void);
	extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
	struct perf_cpu_context *cpuctx,
	struct perf_counter_context *ctx, int cpu);
	extern void perf_counter_update_userpage(struct perf_counter *counter);

	extern void perf_counter_output(struct perf_counter *counter,
	int nmi, struct pt_regs *regs);
	/*
	* Return 1 for a software counter, 0 for a hardware counter
	*/
	static inline int is_software_counter(struct perf_counter *counter)
	{
	return !perf_event_raw(&counter->hw_event) &&
	perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
	}

	extern void perf_swcounter_event(u32, u64, int, struct pt_regs *);

	#else
	static inline void
	perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
	static inline void
	perf_counter_task_sched_out(struct task_struct *task, int cpu) { }
	static inline void
	perf_counter_task_tick(struct task_struct *task, int cpu) { }
	static inline void perf_counter_init_task(struct task_struct *child) { }
	static inline void perf_counter_exit_task(struct task_struct *child) { }
	static inline void perf_counter_notify(struct pt_regs *regs) { }
	static inline void perf_counter_print_debug(void) { }
	static inline void perf_counter_unthrottle(void) { }
	static inline void hw_perf_restore(u64 ctrl) { }
	static inline u64 hw_perf_save_disable(void) { return 0; }
	static inline int perf_counter_task_disable(void) { return -EINVAL; }
	static inline int perf_counter_task_enable(void) { return -EINVAL; }

	static inline void perf_swcounter_event(u32 event, u64 nr,
	int nmi, struct pt_regs *regs) { }
	#endif

	#endif /* __KERNEL__ */
	#endif /* _LINUX_PERF_COUNTER_H */