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 */
36
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.