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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 <asm/ioctl.h>
#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>
struct task_struct;
/*
* User-space ABI bits:
*/
/*
* Generalized performance counter event types, used by the hw_event.type
* parameter of the sys_perf_counter_open() syscall:
*/
enum hw_event_types {
/*
* 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):
*/
PERF_COUNT_CPU_CLOCK = -1,
PERF_COUNT_TASK_CLOCK = -2,
PERF_COUNT_PAGE_FAULTS = -3,
PERF_COUNT_CONTEXT_SWITCHES = -4,
PERF_COUNT_CPU_MIGRATIONS = -5,
PERF_SW_EVENTS_MIN = -6,
};
/*
* IRQ-notification data record type:
*/
enum perf_counter_record_type {
PERF_RECORD_SIMPLE = 0,
PERF_RECORD_IRQ = 1,
PERF_RECORD_GROUP = 2,
};
/*
* Hardware event to monitor via a performance monitoring counter:
*/
struct perf_counter_hw_event {
s64 type;
u64 irq_period;
u32 record_type;
u32 disabled : 1, /* off by default */
nmi : 1, /* NMI sampling */
raw : 1, /* raw event type */
inherit : 1, /* children inherit it */
pinned : 1, /* must always be on PMU */
exclusive : 1, /* only counter on PMU */
__reserved_1 : 26;
u64 __reserved_2;
};
/*
* Ioctls that can be done on a perf counter fd:
*/
#define PERF_COUNTER_IOC_ENABLE _IO('$', 0)
#define PERF_COUNTER_IOC_DISABLE _IO('$', 1)
/*
* Kernel-internal data types:
*/
/**
* struct hw_perf_counter - performance counter hardware details:
*/
struct hw_perf_counter {
#ifdef CONFIG_PERF_COUNTERS
u64 config;
unsigned long config_base;
unsigned long counter_base;
int nmi;
unsigned int idx;
atomic64_t prev_count;
u64 irq_period;
atomic64_t period_left;
#endif
};
/*
* 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;
/**
* 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_counter - performance counter kernel representation:
*/
struct perf_counter {
#ifdef CONFIG_PERF_COUNTERS
struct list_head list_entry;
struct list_head sibling_list;
struct perf_counter *group_leader;
const struct hw_perf_counter_ops *hw_ops;
enum perf_counter_active_state 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;
/* 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];
#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;
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;
};
/*
* 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 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);
/*
* Return 1 for a software counter, 0 for a hardware counter
*/
static inline int is_software_counter(struct perf_counter *counter)
{
return !counter->hw_event.raw && counter->hw_event.type < 0;
}
#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 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; }
#endif
#endif /* _LINUX_PERF_COUNTER_H */
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