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eab443ef39
On Krait processors we have a many-to-one relationship between raw CPU events and the event programmed into the PMNx counter. Two raw CPU events could map to the same value programmed in the PMNx counter. To avoid this problem, we check for collisions during the get_event_idx() callback by setting a bit in a bitmap whenever a certain event is used in a PMNx counter (see the next patch). Unfortunately, we don't have a hook to clear this bit in the bitmap when the event is deleted so let's add an optional clear_event_idx() callback for this purpose. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*
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* linux/arch/arm/include/asm/pmu.h
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*
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* Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __ARM_PMU_H__
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#define __ARM_PMU_H__
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#include <linux/interrupt.h>
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#include <linux/perf_event.h>
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/*
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* struct arm_pmu_platdata - ARM PMU platform data
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*
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* @handle_irq: an optional handler which will be called from the
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* interrupt and passed the address of the low level handler,
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* and can be used to implement any platform specific handling
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* before or after calling it.
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* @runtime_resume: an optional handler which will be called by the
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* runtime PM framework following a call to pm_runtime_get().
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* Note that if pm_runtime_get() is called more than once in
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* succession this handler will only be called once.
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* @runtime_suspend: an optional handler which will be called by the
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* runtime PM framework following a call to pm_runtime_put().
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* Note that if pm_runtime_get() is called more than once in
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* succession this handler will only be called following the
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* final call to pm_runtime_put() that actually disables the
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* hardware.
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*/
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struct arm_pmu_platdata {
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irqreturn_t (*handle_irq)(int irq, void *dev,
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irq_handler_t pmu_handler);
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int (*runtime_resume)(struct device *dev);
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int (*runtime_suspend)(struct device *dev);
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};
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#ifdef CONFIG_HW_PERF_EVENTS
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/* The events for a given PMU register set. */
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struct pmu_hw_events {
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/*
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* The events that are active on the PMU for the given index.
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*/
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struct perf_event **events;
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/*
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* A 1 bit for an index indicates that the counter is being used for
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* an event. A 0 means that the counter can be used.
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*/
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unsigned long *used_mask;
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/*
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* Hardware lock to serialize accesses to PMU registers. Needed for the
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* read/modify/write sequences.
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*/
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raw_spinlock_t pmu_lock;
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};
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struct arm_pmu {
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struct pmu pmu;
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cpumask_t active_irqs;
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char *name;
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irqreturn_t (*handle_irq)(int irq_num, void *dev);
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void (*enable)(struct perf_event *event);
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void (*disable)(struct perf_event *event);
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int (*get_event_idx)(struct pmu_hw_events *hw_events,
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struct perf_event *event);
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void (*clear_event_idx)(struct pmu_hw_events *hw_events,
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struct perf_event *event);
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int (*set_event_filter)(struct hw_perf_event *evt,
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struct perf_event_attr *attr);
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u32 (*read_counter)(struct perf_event *event);
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void (*write_counter)(struct perf_event *event, u32 val);
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void (*start)(struct arm_pmu *);
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void (*stop)(struct arm_pmu *);
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void (*reset)(void *);
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int (*request_irq)(struct arm_pmu *, irq_handler_t handler);
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void (*free_irq)(struct arm_pmu *);
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int (*map_event)(struct perf_event *event);
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int num_events;
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atomic_t active_events;
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struct mutex reserve_mutex;
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u64 max_period;
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struct platform_device *plat_device;
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struct pmu_hw_events *(*get_hw_events)(void);
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};
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#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
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extern const struct dev_pm_ops armpmu_dev_pm_ops;
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int armpmu_register(struct arm_pmu *armpmu, int type);
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u64 armpmu_event_update(struct perf_event *event);
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int armpmu_event_set_period(struct perf_event *event);
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int armpmu_map_event(struct perf_event *event,
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const unsigned (*event_map)[PERF_COUNT_HW_MAX],
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const unsigned (*cache_map)[PERF_COUNT_HW_CACHE_MAX]
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[PERF_COUNT_HW_CACHE_OP_MAX]
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[PERF_COUNT_HW_CACHE_RESULT_MAX],
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u32 raw_event_mask);
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#endif /* CONFIG_HW_PERF_EVENTS */
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#endif /* __ARM_PMU_H__ */
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