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