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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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929f519944
For OProfile to initialise oprofilefs correctly, it needs to know the number of counters it can represent. This patch adds a function to the ARM perf-events backend to return the number of hardware counters available for the current PMU. Cc: Jamie Iles <jamie.iles@picochip.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/*
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* linux/arch/arm/include/asm/perf_event.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_PERF_EVENT_H__
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#define __ARM_PERF_EVENT_H__
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/*
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* NOP: on *most* (read: all supported) ARM platforms, the performance
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* counter interrupts are regular interrupts and not an NMI. This
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* means that when we receive the interrupt we can call
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* perf_event_do_pending() that handles all of the work with
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* interrupts enabled.
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*/
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static inline void
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set_perf_event_pending(void)
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{
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}
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/* ARM performance counters start from 1 (in the cp15 accesses) so use the
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* same indexes here for consistency. */
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#define PERF_EVENT_INDEX_OFFSET 1
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/* ARM perf PMU IDs for use by internal perf clients. */
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enum arm_perf_pmu_ids {
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ARM_PERF_PMU_ID_XSCALE1 = 0,
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ARM_PERF_PMU_ID_XSCALE2,
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ARM_PERF_PMU_ID_V6,
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ARM_PERF_PMU_ID_V6MP,
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ARM_PERF_PMU_ID_CA8,
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ARM_PERF_PMU_ID_CA9,
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ARM_NUM_PMU_IDS,
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};
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extern enum arm_perf_pmu_ids
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armpmu_get_pmu_id(void);
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extern int
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armpmu_get_max_events(void);
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#endif /* __ARM_PERF_EVENT_H__ */
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