[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),
};

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

/**
 * 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
	u64				__irq_period;

	struct hw_perf_counter		hw;

	struct perf_counter_context	*ctx;
	struct task_struct		*task;

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

	int				oncpu;
	int				cpu;

	s32				hw_event_type;
	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),
	41	};
	42
	43	/*
	44	* IRQ-notification data record type:
	45	*/
	46	enum perf_record_type {
	47	PERF_RECORD_SIMPLE,
	48	PERF_RECORD_IRQ,
	49	PERF_RECORD_GROUP,
	50	};
	51
	52	/**
	53	* struct hw_perf_counter - performance counter hardware details
	54	*/
	55	struct hw_perf_counter {
	56	u64 config;
	57	unsigned long config_base;
	58	unsigned long counter_base;
	59	int nmi;
	60	unsigned int idx;
	61	u64 prev_count;
	62	s32 next_count;
	63	u64 irq_period;
	64	};
65
66	/*
67	* Hardcoded buffer length limit for now, for IRQ-fed events:
68	*/
69	#define PERF_DATA_BUFLEN 2048
70
71	/**
72	* struct perf_data - performance counter IRQ data sampling ...
73	*/
74	struct perf_data {
75	int len;
76	int rd_idx;
77	int overrun;
78	u8 data[PERF_DATA_BUFLEN];
79	};
80
81	/**
82	* struct perf_counter - performance counter kernel representation:
83	*/
84	struct perf_counter {
85	struct list_head list;
86	int active;
87	#if BITS_PER_LONG == 64
88	atomic64_t count;
89	#else
90	atomic_t count32[2];
91	#endif
92	u64 __irq_period;
93
94	struct hw_perf_counter hw;
95
96	struct perf_counter_context *ctx;
97	struct task_struct *task;
98
99	/*
100	* Protect attach/detach:
101	*/
102	struct mutex mutex;
103
104	int oncpu;
105	int cpu;
106
107	s32 hw_event_type;
108	enum perf_record_type record_type;
109
110	/* read() / irq related data */
111	wait_queue_head_t waitq;
112	/* optional: for NMIs */
113	int wakeup_pending;
114	struct perf_data *irqdata;
115	struct perf_data *usrdata;
116	struct perf_data data[2];
117	};
118
119	/**
120	* struct perf_counter_context - counter context structure
121	*
122	* Used as a container for task counters and CPU counters as well:
123	*/
124	struct perf_counter_context {
125	#ifdef CONFIG_PERF_COUNTERS
126	/*
127	* Protect the list of counters:
128	*/
129	spinlock_t lock;
130	struct list_head counters;
131	int nr_counters;
132	int nr_active;
133	struct task_struct *task;
134	#endif
135	};
136
137	/**
138	* struct perf_counter_cpu_context - per cpu counter context structure
139	*/
140	struct perf_cpu_context {
141	struct perf_counter_context ctx;
142	struct perf_counter_context *task_ctx;
143	int active_oncpu;
144	int max_pertask;
145	};
146
147	/*
148	* Set by architecture code:
149	*/
150	extern int perf_max_counters;
151
152	#ifdef CONFIG_PERF_COUNTERS
153	extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
154	extern void perf_counter_task_sched_out(struct task_struct *task, int cpu);
155	extern void perf_counter_task_tick(struct task_struct *task, int cpu);
156	extern void perf_counter_init_task(struct task_struct *task);
157	extern void perf_counter_notify(struct pt_regs *regs);
158	extern void perf_counter_print_debug(void);
4ac13294 TG	159	extern void hw_perf_restore_ctrl(u64 ctrl);
4ac13294 TG	160	extern u64 hw_perf_disable_all(void);
0793a61d TG	161	#else
	162	static inline void
	163	perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
	164	static inline void
	165	perf_counter_task_sched_out(struct task_struct *task, int cpu) { }
	166	static inline void
	167	perf_counter_task_tick(struct task_struct *task, int cpu) { }
	168	static inline void perf_counter_init_task(struct task_struct *task) { }
	169	static inline void perf_counter_notify(struct pt_regs *regs) { }
	170	static inline void perf_counter_print_debug(void) { }
4ac13294 TG	171	static inline void hw_perf_restore_ctrl(u64 ctrl) { }
4ac13294 TG	172	static inline u64 hw_perf_disable_all(void) { return 0; }
0793a61d TG	173	#endif
	174
	175	#endif /* _LINUX_PERF_COUNTER_H */