/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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* Based on arch/arm64/include/asm/cpu_ops.h
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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/sched.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 boot protocol.
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* @cpu_prepare: Early one-time preparation step for a cpu. If there
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* is a mechanism for doing so, tests whether it is
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* possible to boot the given HART.
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* @cpu_start: Boots a cpu into the kernel.
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* @cpu_disable: Prepares a cpu to die. May fail for some
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* mechanism-specific reason, which will cause the hot
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* unplug to be aborted. Called from the cpu to be killed.
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* @cpu_stop: Makes a cpu leave the kernel. Must not fail. Called from
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* the cpu being stopped.
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* @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another
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* cpu.
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*/
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struct cpu_operations {
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const char *name;
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int (*cpu_prepare)(unsigned int cpu);
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int (*cpu_start)(unsigned int cpu,
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struct task_struct *tidle);
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#ifdef CONFIG_HOTPLUG_CPU
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int (*cpu_disable)(unsigned int cpu);
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void (*cpu_stop)(void);
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int (*cpu_is_stopped)(unsigned int cpu);
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#endif
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};
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extern const struct cpu_operations *cpu_ops[NR_CPUS];
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void __init cpu_set_ops(int cpu);
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void cpu_update_secondary_bootdata(unsigned int cpuid,
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struct task_struct *tidle);
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#endif /* ifndef __ASM_CPU_OPS_H */
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