/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2013 ARM Ltd.
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*/
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#ifndef __ASM_CPU_OPS_H
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#define __ASM_CPU_OPS_H
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#include <linux/init.h>
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#include <linux/threads.h>
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/**
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* struct cpu_operations - Callback operations for hotplugging CPUs.
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*
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* @name: Name of the property as appears in a devicetree cpu node's
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* enable-method property. On systems booting with ACPI, @name
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* identifies the struct cpu_operations entry corresponding to
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* the boot protocol specified in the ACPI MADT table.
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* @cpu_init: Reads any data necessary for a specific enable-method for a
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* proposed logical id.
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* @cpu_prepare: Early one-time preparation step for a cpu. If there is a
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* mechanism for doing so, tests whether it is possible to boot
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* the given CPU.
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* @cpu_boot: Boots a cpu into the kernel.
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* @cpu_postboot: Optionally, perform any post-boot cleanup or necessary
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* synchronisation. Called from the cpu being booted.
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* @cpu_can_disable: Determines whether a CPU can be disabled based on
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* mechanism-specific information.
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* @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
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* reason, which will cause the hot unplug to be aborted. Called
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* from the cpu to be killed.
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* @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the
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* cpu being killed.
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* @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu.
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* @cpu_init_idle: Reads any data necessary to initialize CPU idle states for
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* a proposed logical id.
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* @cpu_suspend: Suspends a cpu and saves the required context. May fail owing
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* to wrong parameters or error conditions. Called from the
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* CPU being suspended. Must be called with IRQs disabled.
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*/
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struct cpu_operations {
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const char *name;
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int (*cpu_init)(unsigned int);
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int (*cpu_prepare)(unsigned int);
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int (*cpu_boot)(unsigned int);
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void (*cpu_postboot)(void);
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#ifdef CONFIG_HOTPLUG_CPU
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bool (*cpu_can_disable)(unsigned int cpu);
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int (*cpu_disable)(unsigned int cpu);
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void (*cpu_die)(unsigned int cpu);
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int (*cpu_kill)(unsigned int cpu);
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#endif
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#ifdef CONFIG_CPU_IDLE
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int (*cpu_init_idle)(unsigned int);
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int (*cpu_suspend)(unsigned long);
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#endif
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};
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int __init init_cpu_ops(int cpu);
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extern const struct cpu_operations *get_cpu_ops(int cpu);
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static inline void __init init_bootcpu_ops(void)
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{
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init_cpu_ops(0);
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}
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#endif /* ifndef __ASM_CPU_OPS_H */
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