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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__

#include <linux/interrupt.h>
#include <linux/perf_event.h>

#include <asm/cputype.h>

/*
 * struct arm_pmu_platdata - ARM PMU platform data
 *
 * @handle_irq: an optional handler which will be called from the
 *	interrupt and passed the address of the low level handler,
 *	and can be used to implement any platform specific handling
 *	before or after calling it.
 * @runtime_resume: an optional handler which will be called by the
 *	runtime PM framework following a call to pm_runtime_get().
 *	Note that if pm_runtime_get() is called more than once in
 *	succession this handler will only be called once.
 * @runtime_suspend: an optional handler which will be called by the
 *	runtime PM framework following a call to pm_runtime_put().
 *	Note that if pm_runtime_get() is called more than once in
 *	succession this handler will only be called following the
 *	final call to pm_runtime_put() that actually disables the
 *	hardware.
 */
struct arm_pmu_platdata {
	irqreturn_t (*handle_irq)(int irq, void *dev,
				  irq_handler_t pmu_handler);
	int (*runtime_resume)(struct device *dev);
	int (*runtime_suspend)(struct device *dev);
};

#ifdef CONFIG_HW_PERF_EVENTS

/*
 * The ARMv7 CPU PMU supports up to 32 event counters.
 */
#define ARMPMU_MAX_HWEVENTS		32

#define HW_OP_UNSUPPORTED		0xFFFF
#define C(_x)				PERF_COUNT_HW_CACHE_##_x
#define CACHE_OP_UNSUPPORTED		0xFFFF

#define PERF_MAP_ALL_UNSUPPORTED					\
	[0 ... PERF_COUNT_HW_MAX - 1] = HW_OP_UNSUPPORTED

#define PERF_CACHE_MAP_ALL_UNSUPPORTED					\
[0 ... C(MAX) - 1] = {							\
	[0 ... C(OP_MAX) - 1] = {					\
		[0 ... C(RESULT_MAX) - 1] = CACHE_OP_UNSUPPORTED,	\
	},								\
}

/* The events for a given PMU register set. */
struct pmu_hw_events {
	/*
	 * The events that are active on the PMU for the given index.
	 */
	struct perf_event	*events[ARMPMU_MAX_HWEVENTS];

	/*
	 * A 1 bit for an index indicates that the counter is being used for
	 * an event. A 0 means that the counter can be used.
	 */
	DECLARE_BITMAP(used_mask, ARMPMU_MAX_HWEVENTS);

	/*
	 * Hardware lock to serialize accesses to PMU registers. Needed for the
	 * read/modify/write sequences.
	 */
	raw_spinlock_t		pmu_lock;

	/*
	 * When using percpu IRQs, we need a percpu dev_id. Place it here as we
	 * already have to allocate this struct per cpu.
	 */
	struct arm_pmu		*percpu_pmu;

#ifdef CONFIG_SMP
	/*
	 * This is used to schedule workaround logic on platforms where all
	 * the PMUs are attached to a single SPI.
	 */
	struct irq_work work;
#endif
};

struct arm_pmu {
	struct pmu	pmu;
	cpumask_t	active_irqs;
	char		*name;
	irqreturn_t	(*handle_irq)(int irq_num, void *dev);
	void		(*enable)(struct perf_event *event);
	void		(*disable)(struct perf_event *event);
	int		(*get_event_idx)(struct pmu_hw_events *hw_events,
					 struct perf_event *event);
	void		(*clear_event_idx)(struct pmu_hw_events *hw_events,
					 struct perf_event *event);
	int		(*set_event_filter)(struct hw_perf_event *evt,
					    struct perf_event_attr *attr);
	u32		(*read_counter)(struct perf_event *event);
	void		(*write_counter)(struct perf_event *event, u32 val);
	void		(*start)(struct arm_pmu *);
	void		(*stop)(struct arm_pmu *);
	void		(*reset)(void *);
	int		(*request_irq)(struct arm_pmu *, irq_handler_t handler);
	void		(*free_irq)(struct arm_pmu *);
	int		(*map_event)(struct perf_event *event);
	int		num_events;
	atomic_t	active_events;
	struct mutex	reserve_mutex;
	u64		max_period;
	struct platform_device	*plat_device;
	struct pmu_hw_events	__percpu *hw_events;
	struct notifier_block	hotplug_nb;
#ifdef CONFIG_SMP
	int			muxed_spi_workaround_irq;
	struct work_struct	muxed_spi_workaround_work;
	atomic_t		remaining_irq_work;
#endif
};

#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))

extern const struct dev_pm_ops armpmu_dev_pm_ops;

int armpmu_register(struct arm_pmu *armpmu, int type);

u64 armpmu_event_update(struct perf_event *event);

int armpmu_event_set_period(struct perf_event *event);

int armpmu_map_event(struct perf_event *event,
		     const unsigned (*event_map)[PERF_COUNT_HW_MAX],
		     const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
						[PERF_COUNT_HW_CACHE_OP_MAX]
						[PERF_COUNT_HW_CACHE_RESULT_MAX],
		     u32 raw_event_mask);

struct pmu_probe_info {
	unsigned int cpuid;
	unsigned int mask;
	int (*init)(struct arm_pmu *);
};

#define PMU_PROBE(_cpuid, _mask, _fn)	\
{					\
	.cpuid = (_cpuid),		\
	.mask = (_mask),		\
	.init = (_fn),			\
}

#define ARM_PMU_PROBE(_cpuid, _fn) \
	PMU_PROBE(_cpuid, ARM_CPU_PART_MASK, _fn)

#define ARM_PMU_XSCALE_MASK	((0xff << 24) | ARM_CPU_XSCALE_ARCH_MASK)

#define XSCALE_PMU_PROBE(_version, _fn) \
	PMU_PROBE(ARM_CPU_IMP_INTEL << 24 | _version, ARM_PMU_XSCALE_MASK, _fn)

#endif /* CONFIG_HW_PERF_EVENTS */

#endif /* __ARM_PMU_H__ */