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d08e2e0904
When the switcher is active, there is no straightforward way to figure out which logical CPU a given physical CPU maps to. This patch provides a function bL_switcher_get_logical_index(mpidr), which is analogous to get_logical_index(). This function returns the logical CPU on which the specified physical CPU is grouped (or -EINVAL if unknown). If the switcher is inactive or not present, -EUNATCH is returned instead. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Nicolas Pitre <nico@linaro.org>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/*
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* arch/arm/include/asm/bL_switcher.h
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*
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* Created by: Nicolas Pitre, April 2012
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* Copyright: (C) 2012-2013 Linaro Limited
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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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#ifndef ASM_BL_SWITCHER_H
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#define ASM_BL_SWITCHER_H
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#include <linux/compiler.h>
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#include <linux/types.h>
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typedef void (*bL_switch_completion_handler)(void *cookie);
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int bL_switch_request_cb(unsigned int cpu, unsigned int new_cluster_id,
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bL_switch_completion_handler completer,
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void *completer_cookie);
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static inline int bL_switch_request(unsigned int cpu, unsigned int new_cluster_id)
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{
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return bL_switch_request_cb(cpu, new_cluster_id, NULL, NULL);
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}
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/*
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* Register here to be notified about runtime enabling/disabling of
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* the switcher.
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*
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* The notifier chain is called with the switcher activation lock held:
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* the switcher will not be enabled or disabled during callbacks.
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* Callbacks must not call bL_switcher_{get,put}_enabled().
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*/
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#define BL_NOTIFY_PRE_ENABLE 0
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#define BL_NOTIFY_POST_ENABLE 1
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#define BL_NOTIFY_PRE_DISABLE 2
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#define BL_NOTIFY_POST_DISABLE 3
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#ifdef CONFIG_BL_SWITCHER
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int bL_switcher_register_notifier(struct notifier_block *nb);
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int bL_switcher_unregister_notifier(struct notifier_block *nb);
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/*
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* Use these functions to temporarily prevent enabling/disabling of
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* the switcher.
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* bL_switcher_get_enabled() returns true if the switcher is currently
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* enabled. Each call to bL_switcher_get_enabled() must be followed
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* by a call to bL_switcher_put_enabled(). These functions are not
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* recursive.
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*/
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bool bL_switcher_get_enabled(void);
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void bL_switcher_put_enabled(void);
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int bL_switcher_trace_trigger(void);
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int bL_switcher_get_logical_index(u32 mpidr);
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#else
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static inline int bL_switcher_register_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int bL_switcher_unregister_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline bool bL_switcher_get_enabled(void) { return false; }
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static inline void bL_switcher_put_enabled(void) { }
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static inline int bL_switcher_trace_trigger(void) { return 0; }
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static inline int bL_switcher_get_logical_index(u32 mpidr) { return -EUNATCH; }
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#endif /* CONFIG_BL_SWITCHER */
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#endif
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