1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2013 ARM Ltd.
4 */
5 #ifndef __ASM_CPU_OPS_H
6 #define __ASM_CPU_OPS_H
7
8 #include <linux/init.h>
9 #include <linux/threads.h>
10
11 /**
12 * struct cpu_operations - Callback operations for hotplugging CPUs.
13 *
14 * @name: Name of the property as appears in a devicetree cpu node's
15 * enable-method property. On systems booting with ACPI, @name
16 * identifies the struct cpu_operations entry corresponding to
17 * the boot protocol specified in the ACPI MADT table.
18 * @cpu_init: Reads any data necessary for a specific enable-method for a
19 * proposed logical id.
20 * @cpu_prepare: Early one-time preparation step for a cpu. If there is a
21 * mechanism for doing so, tests whether it is possible to boot
22 * the given CPU.
23 * @cpu_boot: Boots a cpu into the kernel.
24 * @cpu_postboot: Optionally, perform any post-boot cleanup or necessary
25 * synchronisation. Called from the cpu being booted.
26 * @cpu_can_disable: Determines whether a CPU can be disabled based on
27 * mechanism-specific information.
28 * @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
29 * reason, which will cause the hot unplug to be aborted. Called
30 * from the cpu to be killed.
31 * @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the
32 * cpu being killed.
33 * @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu.
34 */
35 struct cpu_operations {
36 const char *name;
37 int (*cpu_init)(unsigned int);
38 int (*cpu_prepare)(unsigned int);
39 int (*cpu_boot)(unsigned int);
40 void (*cpu_postboot)(void);
41 #ifdef CONFIG_HOTPLUG_CPU
42 bool (*cpu_can_disable)(unsigned int cpu);
43 int (*cpu_disable)(unsigned int cpu);
44 void (*cpu_die)(unsigned int cpu);
45 int (*cpu_kill)(unsigned int cpu);
46 #endif
47 };
48
49 int __init init_cpu_ops(int cpu);
50 extern const struct cpu_operations *get_cpu_ops(int cpu);
51
52 static inline void __init init_bootcpu_ops(void)
53 {
54 init_cpu_ops(0);
55 }
56
57 #endif /* ifndef __ASM_CPU_OPS_H */
58
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.