/* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2013 ARM Ltd. */ #ifndef __ASM_CPU_OPS_H #define __ASM_CPU_OPS_H #include <linux/init.h> #include <linux/threads.h> /** * struct cpu_operations - Callback operations for hotplugging CPUs. * * @name: Name of the property as appears in a devicetree cpu node's * enable-method property. On systems booting with ACPI, @name * identifies the struct cpu_operations entry corresponding to * the boot protocol specified in the ACPI MADT table. * @cpu_init: Reads any data necessary for a specific enable-method for a * proposed logical id. * @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 CPU. * @cpu_boot: Boots a cpu into the kernel. * @cpu_postboot: Optionally, perform any post-boot cleanup or necesary * synchronisation. Called from the cpu being booted. * @cpu_can_disable: Determines whether a CPU can be disabled based on * mechanism-specific information. * @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_die: Makes a cpu leave the kernel. Must not fail. Called from the * cpu being killed. * @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu. * @cpu_init_idle: Reads any data necessary to initialize CPU idle states for * a proposed logical id. * @cpu_suspend: Suspends a cpu and saves the required context. May fail owing * to wrong parameters or error conditions. Called from the * CPU being suspended. Must be called with IRQs disabled. */ struct cpu_operations { const char *name; int (*cpu_init)(unsigned int); int (*cpu_prepare)(unsigned int); int (*cpu_boot)(unsigned int); void (*cpu_postboot)(void); #ifdef [31mCONFIG_HOTPLUG_CPU[0m bool (*cpu_can_disable)(unsigned int cpu); int (*cpu_disable)(unsigned int cpu); void (*cpu_die)(unsigned int cpu); int (*cpu_kill)(unsigned int cpu); #endif #ifdef [31mCONFIG_CPU_IDLE[0m int (*cpu_init_idle)(unsigned int); int (*cpu_suspend)(unsigned long); #endif }; extern const struct cpu_operations *cpu_ops[NR_CPUS]; int __init cpu_read_ops(int cpu); static inline void __init cpu_read_bootcpu_ops(void) { cpu_read_ops(0); } #endif /* ifndef __ASM_CPU_OPS_H */ |