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Diffstat (limited to 'arch/arm/include/asm/pmu.h')
-rw-r--r-- | arch/arm/include/asm/pmu.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/arm/include/asm/pmu.h b/arch/arm/include/asm/pmu.h new file mode 100644 index 0000000..8ccea01 --- /dev/null +++ b/arch/arm/include/asm/pmu.h @@ -0,0 +1,77 @@ +/* + * 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__ + +enum arm_pmu_type { + ARM_PMU_DEVICE_CPU = 0, + ARM_NUM_PMU_DEVICES, +}; + +#ifdef CONFIG_CPU_HAS_PMU + +/** + * reserve_pmu() - reserve the hardware performance counters + * + * Reserve the hardware performance counters in the system for exclusive use. + * The platform_device for the system is returned on success, ERR_PTR() + * encoded error on failure. + */ +extern struct platform_device * +reserve_pmu(enum arm_pmu_type device); + +/** + * release_pmu() - Relinquish control of the performance counters + * + * Release the performance counters and allow someone else to use them. + * Callers must have disabled the counters and released IRQs before calling + * this. The platform_device returned from reserve_pmu() must be passed as + * a cookie. + */ +extern int +release_pmu(struct platform_device *pdev); + +/** + * init_pmu() - Initialise the PMU. + * + * Initialise the system ready for PMU enabling. This should typically set the + * IRQ affinity and nothing else. The users (oprofile/perf events etc) will do + * the actual hardware initialisation. + */ +extern int +init_pmu(enum arm_pmu_type device); + +#else /* CONFIG_CPU_HAS_PMU */ + +#include <linux/err.h> + +static inline struct platform_device * +reserve_pmu(enum arm_pmu_type device) +{ + return ERR_PTR(-ENODEV); +} + +static inline int +release_pmu(struct platform_device *pdev) +{ + return -ENODEV; +} + +static inline int +init_pmu(enum arm_pmu_type device) +{ + return -ENODEV; +} + +#endif /* CONFIG_CPU_HAS_PMU */ + +#endif /* __ARM_PMU_H__ */ |