arch/riscv/include/asm/cpu_ops.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2020 Western Digital Corporation or its affiliates.
   4  * Based on arch/arm64/include/asm/cpu_ops.h
   5  */
   6 #ifndef __ASM_CPU_OPS_H
   7 #define __ASM_CPU_OPS_H
   8
   9 #include <linux/init.h>
  10 #include <linux/sched.h>
  11 #include <linux/threads.h>
  12
  13 /**
  14  * struct cpu_operations - Callback operations for hotplugging CPUs.
  15  *
  16  * @name:               Name of the boot protocol.
  17  * @cpu_prepare:        Early one-time preparation step for a cpu. If there
  18  *                      is a mechanism for doing so, tests whether it is
  19  *                      possible to boot the given HART.
  20  * @cpu_start:          Boots a cpu into the kernel.
  21  * @cpu_disable:        Prepares a cpu to die. May fail for some
  22  *                      mechanism-specific reason, which will cause the hot
  23  *                      unplug to be aborted. Called from the cpu to be killed.
  24  * @cpu_stop:           Makes a cpu leave the kernel. Must not fail. Called from
  25  *                      the cpu being stopped.
  26  * @cpu_is_stopped:     Ensures a cpu has left the kernel. Called from another
  27  *                      cpu.
  28  */
  29 struct cpu_operations {
  30         const char      *name;
  31         int             (*cpu_prepare)(unsigned int cpu);
  32         int             (*cpu_start)(unsigned int cpu,
  33                                      struct task_struct *tidle);
  34 #ifdef CONFIG_HOTPLUG_CPU
  35         int             (*cpu_disable)(unsigned int cpu);
  36         void            (*cpu_stop)(void);
  37         int             (*cpu_is_stopped)(unsigned int cpu);
  38 #endif
  39 };
  40
  41 extern const struct cpu_operations *cpu_ops[NR_CPUS];
  42 void __init cpu_set_ops(int cpu);
  43 void cpu_update_secondary_bootdata(unsigned int cpuid,
  44                                    struct task_struct *tidle);
  45
  46 #endif /* ifndef __ASM_CPU_OPS_H */