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/*
* 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);
#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) { }
#endif
#endif /* _LINUX_PERF_COUNTER_H */
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