[deliverable/linux.git] / arch / arm / kernel / pmu.c

/*
 *  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);
Commit	Line	Data
	1	/*
	2	* linux/arch/arm/kernel/pmu.c
	3	*
	4	* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
	5	* Copyright (C) 2010 ARM Ltd, Will Deacon
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	*/
	12
	13	#include <linux/err.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16
	17	#include <asm/pmu.h>
	18
	19	/*
	20	* PMU locking to ensure mutual exclusion between different subsystems.
	21	*/
	22	static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
	23
	24	int
	25	reserve_pmu(enum arm_pmu_type type)
	26	{
	27	return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
	28	}
	29	EXPORT_SYMBOL_GPL(reserve_pmu);
	30
	31	void
	32	release_pmu(enum arm_pmu_type type)
	33	{
	34	clear_bit_unlock(type, pmu_lock);
	35	}
	36	EXPORT_SYMBOL_GPL(release_pmu);