1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
/* 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 */
|
