1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
4 * Based on arch/arm64/include/asm/cpu_ops.h
6 #ifndef __ASM_CPU_OPS_H
7 #define __ASM_CPU_OPS_H
9 #include <linux/init.h>
10 #include <linux/sched.h>
11 #include <linux/threads.h>
14 * struct cpu_operations - Callback operations for hotplugging CPUs.
16 * @name: Name of the boot protocol.
17 * @cpu_prepare: Early one-time preparation step for a cpu. If there
18 * is a mechanism for doing so, tests whether it is
19 * possible to boot the given HART.
20 * @cpu_start: Boots a cpu into the kernel.
21 * @cpu_disable: Prepares a cpu to die. May fail for some
22 * mechanism-specific reason, which will cause the hot
23 * unplug to be aborted. Called from the cpu to be killed.
24 * @cpu_stop: Makes a cpu leave the kernel. Must not fail. Called from
25 * the cpu being stopped.
26 * @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another
29 struct cpu_operations {
31 int (*cpu_prepare)(unsigned int cpu);
32 int (*cpu_start)(unsigned int cpu,
33 struct task_struct *tidle);
34 #ifdef CONFIG_HOTPLUG_CPU
35 int (*cpu_disable)(unsigned int cpu);
36 void (*cpu_stop)(void);
37 int (*cpu_is_stopped)(unsigned int cpu);
41 extern const struct cpu_operations *cpu_ops[NR_CPUS];
42 void __init cpu_set_ops(int cpu);
44 #endif /* ifndef __ASM_CPU_OPS_H */