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/*
* linux/arch/arm/include/asm/pmu.h
*
* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef __ARM_PMU_H__
#define __ARM_PMU_H__
enum arm_pmu_type {
ARM_PMU_DEVICE_CPU = 0,
ARM_NUM_PMU_DEVICES,
};
#ifdef CONFIG_CPU_HAS_PMU
struct pmu_irqs {
const int *irqs;
int num_irqs;
};
/**
* reserve_pmu() - reserve the hardware performance counters
*
* Reserve the hardware performance counters in the system for exclusive use.
* The 'struct pmu_irqs' for the system is returned on success, ERR_PTR()
* encoded error on failure.
*/
extern const struct pmu_irqs *
reserve_pmu(void);
/**
* release_pmu() - Relinquish control of the performance counters
*
* Release the performance counters and allow someone else to use them.
* Callers must have disabled the counters and released IRQs before calling
* this. The 'struct pmu_irqs' returned from reserve_pmu() must be passed as
* a cookie.
*/
extern int
release_pmu(const struct pmu_irqs *irqs);
/**
* init_pmu() - Initialise the PMU.
*
* Initialise the system ready for PMU enabling. This should typically set the
* IRQ affinity and nothing else. The users (oprofile/perf events etc) will do
* the actual hardware initialisation.
*/
extern int
init_pmu(void);
#else /* CONFIG_CPU_HAS_PMU */
static inline const struct pmu_irqs *
reserve_pmu(void)
{
return ERR_PTR(-ENODEV);
}
static inline int
release_pmu(const struct pmu_irqs *irqs)
{
return -ENODEV;
}
static inline int
init_pmu(void)
{
return -ENODEV;
}
#endif /* CONFIG_CPU_HAS_PMU */
#endif /* __ARM_PMU_H__ */
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