LXR linux/arch/arm64/include/asm/cpu

   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 */
  49struct 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
  66extern const struct cpu_operations *cpu_ops[NR_CPUS];
  67int __init cpu_read_ops(int cpu);
  68
  69static inline void __init cpu_read_bootcpu_ops(void)
  70{
  71        cpu_read_ops(0);
  72}
  73
  74#endif /* ifndef __ASM_CPU_OPS_H */
  75