1 /*
2 * Copyright (C) 2013 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16 #ifndef __ASM_CPU_OPS_H
17 #define __ASM_CPU_OPS_H
18
19 #include <linux/init.h>
20 #include <linux/threads.h>
21
22 /**
23 * struct cpu_operations - Callback operations for hotplugging CPUs.
24 *
25 * @name: Name of the property as appears in a devicetree cpu node's
26 * enable-method property. On systems booting with ACPI, @name
27 * identifies the struct cpu_operations entry corresponding to
28 * the boot protocol specified in the ACPI MADT table.
29 * @cpu_init: Reads any data necessary for a specific enable-method for a
30 * proposed logical id.
31 * @cpu_prepare: Early one-time preparation step for a cpu. If there is a
32 * mechanism for doing so, tests whether it is possible to boot
33 * the given CPU.
34 * @cpu_boot: Boots a cpu into the kernel.
35 * @cpu_postboot: Optionally, perform any post-boot cleanup or necesary
36 * synchronisation. Called from the cpu being booted.
37 * @cpu_disable: Prepares a cpu to die. May fail for some mechanism-specific
38 * reason, which will cause the hot unplug to be aborted. Called
39 * from the cpu to be killed.
40 * @cpu_die: Makes a cpu leave the kernel. Must not fail. Called from the
41 * cpu being killed.
42 * @cpu_kill: Ensures a cpu has left the kernel. Called from another cpu.
43 * @cpu_init_idle: Reads any data necessary to initialize CPU idle states for
44 * a proposed logical id.
45 * @cpu_suspend: Suspends a cpu and saves the required context. May fail owing
46 * to wrong parameters or error conditions. Called from the
47 * CPU being suspended. Must be called with IRQs disabled.
48 */
49 struct cpu_operations {
50 const char *name;
51 int (*cpu_init)(unsigned int);
52 int (*cpu_prepare)(unsigned int);
53 int (*cpu_boot)(unsigned int);
54 void (*cpu_postboot)(void);
55 #ifdef CONFIG_HOTPLUG_CPU
56 int (*cpu_disable)(unsigned int cpu);
57 void (*cpu_die)(unsigned int cpu);
58 int (*cpu_kill)(unsigned int cpu);
59 #endif
60 #ifdef CONFIG_CPU_IDLE
61 int (*cpu_init_idle)(unsigned int);
62 int (*cpu_suspend)(unsigned long);
63 #endif
64 };
65
66 extern const struct cpu_operations *cpu_ops[NR_CPUS];
67 int __init cpu_read_ops(int cpu);
68
cpu_read_bootcpu_ops(void)69 static inline void __init cpu_read_bootcpu_ops(void)
70 {
71 cpu_read_ops(0);
72 }
73
74 #endif /* ifndef __ASM_CPU_OPS_H */
75
