Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 * @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
27 * cpu.
28 */
29struct cpu_operations {
30 const char *name;
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);
38#endif
39};
40
41extern const struct cpu_operations cpu_ops_spinwait;
42extern const struct cpu_operations *cpu_ops[NR_CPUS];
43void __init cpu_set_ops(int cpu);
44
45#endif /* ifndef __ASM_CPU_OPS_H */