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