1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-only */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (c) 2020 Western Digital Corporation or its affiliates. 4*4882a593Smuzhiyun * Based on arch/arm64/include/asm/cpu_ops.h 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun #ifndef __ASM_CPU_OPS_H 7*4882a593Smuzhiyun #define __ASM_CPU_OPS_H 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/init.h> 10*4882a593Smuzhiyun #include <linux/sched.h> 11*4882a593Smuzhiyun #include <linux/threads.h> 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun /** 14*4882a593Smuzhiyun * struct cpu_operations - Callback operations for hotplugging CPUs. 15*4882a593Smuzhiyun * 16*4882a593Smuzhiyun * @name: Name of the boot protocol. 17*4882a593Smuzhiyun * @cpu_prepare: Early one-time preparation step for a cpu. If there 18*4882a593Smuzhiyun * is a mechanism for doing so, tests whether it is 19*4882a593Smuzhiyun * possible to boot the given HART. 20*4882a593Smuzhiyun * @cpu_start: Boots a cpu into the kernel. 21*4882a593Smuzhiyun * @cpu_disable: Prepares a cpu to die. May fail for some 22*4882a593Smuzhiyun * mechanism-specific reason, which will cause the hot 23*4882a593Smuzhiyun * unplug to be aborted. Called from the cpu to be killed. 24*4882a593Smuzhiyun * @cpu_stop: Makes a cpu leave the kernel. Must not fail. Called from 25*4882a593Smuzhiyun * the cpu being stopped. 26*4882a593Smuzhiyun * @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another 27*4882a593Smuzhiyun * cpu. 28*4882a593Smuzhiyun */ 29*4882a593Smuzhiyun struct cpu_operations { 30*4882a593Smuzhiyun const char *name; 31*4882a593Smuzhiyun int (*cpu_prepare)(unsigned int cpu); 32*4882a593Smuzhiyun int (*cpu_start)(unsigned int cpu, 33*4882a593Smuzhiyun struct task_struct *tidle); 34*4882a593Smuzhiyun #ifdef CONFIG_HOTPLUG_CPU 35*4882a593Smuzhiyun int (*cpu_disable)(unsigned int cpu); 36*4882a593Smuzhiyun void (*cpu_stop)(void); 37*4882a593Smuzhiyun int (*cpu_is_stopped)(unsigned int cpu); 38*4882a593Smuzhiyun #endif 39*4882a593Smuzhiyun }; 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun extern const struct cpu_operations *cpu_ops[NR_CPUS]; 42*4882a593Smuzhiyun void __init cpu_set_ops(int cpu); 43*4882a593Smuzhiyun void cpu_update_secondary_bootdata(unsigned int cpuid, 44*4882a593Smuzhiyun struct task_struct *tidle); 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #endif /* ifndef __ASM_CPU_OPS_H */ 47