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/*
* linux/arch/arm/kernel/pmu.c
*
* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
* Copyright (C) 2010 ARM Ltd, Will Deacon
*
* 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.
*
*/
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <asm/pmu.h>
/*
* PMU locking to ensure mutual exclusion between different subsystems.
*/
static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
int
reserve_pmu(enum arm_pmu_type type)
{
return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
}
EXPORT_SYMBOL_GPL(reserve_pmu);
void
release_pmu(enum arm_pmu_type type)
{
clear_bit_unlock(type, pmu_lock);
}
EXPORT_SYMBOL_GPL(release_pmu);
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