[net-next-2.6.git] / include / 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 <asm/atomic.h>

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

struct task_struct;

/*
 * Generalized hardware event types, used by the hw_event_type parameter
 * of the sys_perf_counter_open() syscall:
 */
enum hw_event_types {
	PERF_COUNT_CYCLES,
	PERF_COUNT_INSTRUCTIONS,
	PERF_COUNT_CACHE_REFERENCES,
	PERF_COUNT_CACHE_MISSES,
	PERF_COUNT_BRANCH_INSTRUCTIONS,
	PERF_COUNT_BRANCH_MISSES,
	/*
	 * If this bit is set in the type, then trigger NMI sampling:
	 */
	PERF_COUNT_NMI			= (1 << 30),
	PERF_COUNT_RAW			= (1 << 31),
};

/*
 * IRQ-notification data record type:
 */
enum perf_record_type {
	PERF_RECORD_SIMPLE,
	PERF_RECORD_IRQ,
	PERF_RECORD_GROUP,
};

struct perf_counter_event {
	u32			hw_event_type;
	u32			hw_event_period;
	u64			hw_raw_ctrl;
};

/**
 * struct hw_perf_counter - performance counter hardware details
 */
struct hw_perf_counter {
	u64			config;
	unsigned long		config_base;
	unsigned long		counter_base;
	int			nmi;
	unsigned int		idx;
	u64			prev_count;
	s32			next_count;
	u64			irq_period;
};

/*
 * Hardcoded buffer length limit for now, for IRQ-fed events:
 */
#define PERF_DATA_BUFLEN	2048

/**
 * struct perf_data - performance counter IRQ data sampling ...
 */
struct perf_data {
	int			len;
	int			rd_idx;
	int			overrun;
	u8			data[PERF_DATA_BUFLEN];
};

/**
 * struct perf_counter - performance counter kernel representation:
 */
struct perf_counter {
	struct list_head		list;
	int				active;
#if BITS_PER_LONG == 64
	atomic64_t			count;
#else
	atomic_t			count32[2];
#endif
	struct perf_counter_event	event;
	struct hw_perf_counter		hw;

	struct perf_counter_context	*ctx;
	struct task_struct		*task;

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

	int				oncpu;
	int				cpu;

	enum perf_record_type		record_type;

	/* read() / irq related data */
	wait_queue_head_t		waitq;
	/* optional: for NMIs */
	int				wakeup_pending;
	struct perf_data		*irqdata;
	struct perf_data		*usrdata;
	struct perf_data		data[2];
};

/**
 * 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 list of counters:
	 */
	spinlock_t		lock;
	struct list_head	counters;
	int			nr_counters;
	int			nr_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;
};

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

#ifdef CONFIG_PERF_COUNTERS
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 *task);
extern void perf_counter_notify(struct pt_regs *regs);
extern void perf_counter_print_debug(void);
extern void hw_perf_restore_ctrl(u64 ctrl);
extern u64 hw_perf_disable_all(void);
#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 *task)	{ }
static inline void perf_counter_notify(struct pt_regs *regs)		{ }
static inline void perf_counter_print_debug(void)			{ }
static inline void hw_perf_restore_ctrl(u64 ctrl)			{ }
static inline u64 hw_perf_disable_all(void)		{ return 0; }
#endif

#endif /* _LINUX_PERF_COUNTER_H */
Commit	Line	Data
0793a61d TG	1	/*
	2	* Performance counters:
	3	*
	4	* Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
	5	* Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
	6	*
	7	* Data type definitions, declarations, prototypes.
	8	*
	9	* Started by: Thomas Gleixner and Ingo Molnar
	10	*
	11	* For licencing details see kernel-base/COPYING
	12	*/
	13	#ifndef _LINUX_PERF_COUNTER_H
	14	#define _LINUX_PERF_COUNTER_H
	15
	16	#include <asm/atomic.h>
	17
	18	#include <linux/list.h>
	19	#include <linux/mutex.h>
	20	#include <linux/rculist.h>
	21	#include <linux/rcupdate.h>
	22	#include <linux/spinlock.h>
	23
	24	struct task_struct;
	25
	26	/*
	27	* Generalized hardware event types, used by the hw_event_type parameter
	28	* of the sys_perf_counter_open() syscall:
	29	*/
	30	enum hw_event_types {
	31	PERF_COUNT_CYCLES,
	32	PERF_COUNT_INSTRUCTIONS,
	33	PERF_COUNT_CACHE_REFERENCES,
	34	PERF_COUNT_CACHE_MISSES,
	35	PERF_COUNT_BRANCH_INSTRUCTIONS,
	36	PERF_COUNT_BRANCH_MISSES,
	37	/*
	38	* If this bit is set in the type, then trigger NMI sampling:
	39	*/
	40	PERF_COUNT_NMI = (1 << 30),
eab656ae	41	PERF_COUNT_RAW = (1 << 31),
0793a61d TG	42	};
	43
	44	/*
	45	* IRQ-notification data record type:
	46	*/
	47	enum perf_record_type {
	48	PERF_RECORD_SIMPLE,
	49	PERF_RECORD_IRQ,
	50	PERF_RECORD_GROUP,
	51	};
	52
eab656ae TG	53	struct perf_counter_event {
	54	u32 hw_event_type;
	55	u32 hw_event_period;
	56	u64 hw_raw_ctrl;
	57	};
	58
0793a61d TG	59	/**
	60	* struct hw_perf_counter - performance counter hardware details
	61	*/
	62	struct hw_perf_counter {
	63	u64 config;
	64	unsigned long config_base;
	65	unsigned long counter_base;
	66	int nmi;
	67	unsigned int idx;
	68	u64 prev_count;
	69	s32 next_count;
	70	u64 irq_period;
	71	};
	72
	73	/*
	74	* Hardcoded buffer length limit for now, for IRQ-fed events:
	75	*/
	76	#define PERF_DATA_BUFLEN 2048
	77
	78	/**
	79	* struct perf_data - performance counter IRQ data sampling ...
	80	*/
	81	struct perf_data {
	82	int len;
	83	int rd_idx;
	84	int overrun;
	85	u8 data[PERF_DATA_BUFLEN];
	86	};
	87
	88	/**
	89	* struct perf_counter - performance counter kernel representation:
	90	*/
	91	struct perf_counter {
	92	struct list_head list;
	93	int active;
	94	#if BITS_PER_LONG == 64
	95	atomic64_t count;
	96	#else
	97	atomic_t count32[2];
	98	#endif
dfa7c899	99	struct perf_counter_event event;
0793a61d TG	100	struct hw_perf_counter hw;
	101
	102	struct perf_counter_context *ctx;
	103	struct task_struct *task;
	104
	105	/*
	106	* Protect attach/detach:
	107	*/
	108	struct mutex mutex;
	109
	110	int oncpu;
	111	int cpu;
	112
0793a61d TG	113	enum perf_record_type record_type;
	114
	115	/* read() / irq related data */
	116	wait_queue_head_t waitq;
	117	/* optional: for NMIs */
	118	int wakeup_pending;
	119	struct perf_data *irqdata;
	120	struct perf_data *usrdata;
	121	struct perf_data data[2];
	122	};
	123
	124	/**
	125	* struct perf_counter_context - counter context structure
	126	*
	127	* Used as a container for task counters and CPU counters as well:
	128	*/
	129	struct perf_counter_context {
	130	#ifdef CONFIG_PERF_COUNTERS
	131	/*
	132	* Protect the list of counters:
	133	*/
	134	spinlock_t lock;
	135	struct list_head counters;
	136	int nr_counters;
	137	int nr_active;
	138	struct task_struct *task;
	139	#endif
	140	};
	141
	142	/**
	143	* struct perf_counter_cpu_context - per cpu counter context structure
	144	*/
	145	struct perf_cpu_context {
	146	struct perf_counter_context ctx;
	147	struct perf_counter_context *task_ctx;
	148	int active_oncpu;
	149	int max_pertask;
	150	};
	151
	152	/*
	153	* Set by architecture code:
	154	*/
	155	extern int perf_max_counters;
	156
	157	#ifdef CONFIG_PERF_COUNTERS
	158	extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
	159	extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
	160	extern void perf_counter_task_tick(struct task_struct *task, int cpu);
	161	extern void perf_counter_init_task(struct task_struct *task);
	162	extern void perf_counter_notify(struct pt_regs *regs);
	163	extern void perf_counter_print_debug(void);
4ac13294 TG	164	extern void hw_perf_restore_ctrl(u64 ctrl);
4ac13294 TG	165	extern u64 hw_perf_disable_all(void);
0793a61d TG	166	#else
	167	static inline void
	168	perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
	169	static inline void
	170	perf_counter_task_sched_out(struct task_struct *task, int cpu) { }
	171	static inline void
	172	perf_counter_task_tick(struct task_struct *task, int cpu) { }
	173	static inline void perf_counter_init_task(struct task_struct *task) { }
	174	static inline void perf_counter_notify(struct pt_regs *regs) { }
	175	static inline void perf_counter_print_debug(void) { }
4ac13294 TG	176	static inline void hw_perf_restore_ctrl(u64 ctrl) { }
4ac13294 TG	177	static inline u64 hw_perf_disable_all(void) { return 0; }
0793a61d TG	178	#endif
	179
	180	#endif /* _LINUX_PERF_COUNTER_H */