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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright (c) 2020 Western Digital Corporation or its affiliates.
- * Based on arch/arm64/include/asm/cpu_ops.h
- */
- #ifndef __ASM_CPU_OPS_H
- #define __ASM_CPU_OPS_H
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/threads.h>
- /**
- * struct cpu_operations - Callback operations for hotplugging CPUs.
- *
- * @name: Name of the boot protocol.
- * @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 HART.
- * @cpu_start: Boots a cpu into the kernel.
- * @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_stop: Makes a cpu leave the kernel. Must not fail. Called from
- * the cpu being stopped.
- * @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another
- * cpu.
- */
- struct cpu_operations {
- const char *name;
- int (*cpu_prepare)(unsigned int cpu);
- int (*cpu_start)(unsigned int cpu,
- struct task_struct *tidle);
- #ifdef CONFIG_HOTPLUG_CPU
- int (*cpu_disable)(unsigned int cpu);
- void (*cpu_stop)(void);
- int (*cpu_is_stopped)(unsigned int cpu);
- #endif
- };
- extern const struct cpu_operations cpu_ops_spinwait;
- extern const struct cpu_operations *cpu_ops[NR_CPUS];
- void __init cpu_set_ops(int cpu);
- #endif /* ifndef __ASM_CPU_OPS_H */
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