1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
4 * Based on arch/arm64/include/asm/cpu_ops.h
5 */
6#ifndef __ASM_CPU_OPS_H
7#define __ASM_CPU_OPS_H
8
9#include <linux/init.h>
10#include <linux/sched.h>
11#include <linux/threads.h>
12
13/**
14 * struct cpu_operations - Callback operations for hotplugging CPUs.
15 *
16 * @cpu_start:		Boots a cpu into the kernel.
17 * @cpu_stop:		Makes a cpu leave the kernel. Must not fail. Called from
18 *			the cpu being stopped.
19 * @cpu_is_stopped:	Ensures a cpu has left the kernel. Called from another
20 *			cpu.
21 */
22struct cpu_operations {
23	int		(*cpu_start)(unsigned int cpu,
24				     struct task_struct *tidle);
25#ifdef CONFIG_HOTPLUG_CPU
26	void		(*cpu_stop)(void);
27	int		(*cpu_is_stopped)(unsigned int cpu);
28#endif
29};
30
31extern const struct cpu_operations cpu_ops_spinwait;
32extern const struct cpu_operations *cpu_ops;
33void __init cpu_set_ops(void);
34
35#endif /* ifndef __ASM_CPU_OPS_H */
36