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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  */
22 struct 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
31 extern const struct cpu_operations cpu_ops_spinwait;
32 extern const struct cpu_operations *cpu_ops;
33 void __init cpu_set_ops(void);
34
35 #endif /* ifndef __ASM_CPU_OPS_H */
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