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Diffstat (limited to 'arch/arm64/include/asm/cpu_ops.h')
| -rw-r--r-- | arch/arm64/include/asm/cpu_ops.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h new file mode 100644 index 000000000..e95c4df83 --- /dev/null +++ b/arch/arm64/include/asm/cpu_ops.h @@ -0,0 +1,66 @@ +/* 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 necessary + * 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 CONFIG_HOTPLUG_CPU + 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 CONFIG_CPU_IDLE + int (*cpu_init_idle)(unsigned int); + int (*cpu_suspend)(unsigned long); +#endif +}; + +int __init init_cpu_ops(int cpu); +extern const struct cpu_operations *get_cpu_ops(int cpu); + +static inline void __init init_bootcpu_ops(void) +{ + init_cpu_ops(0); +} + +#endif /* ifndef __ASM_CPU_OPS_H */ |