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  * @cpu_start:          Boots a cpu into the kernel.
  17  * @cpu_stop:           Makes a cpu leave the kernel. Must not fail. Called from
  18  *                      the cpu being stopped.
  19  * @cpu_is_stopped:     Ensures a cpu has left the kernel. Called from another
  20  *                      cpu.
  21  */
  22 struct cpu_operations {
  23         int             (*cpu_start)(unsigned int cpu,
  24                                      struct task_struct *tidle);
  25 #ifdef CONFIG_HOTPLUG_CPU
  26         void            (*cpu_stop)(void);
  27         int             (*cpu_is_stopped)(unsigned int cpu);
  28 #endif
  29 };
  30
  31 extern const struct cpu_operations cpu_ops_spinwait;
  32 extern const struct cpu_operations *cpu_ops;
  33 void __init cpu_set_ops(void);
  34
  35 #endif /* ifndef __ASM_CPU_OPS_H */