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linux/arch/riscv/include/asm/cpu_ops.h
Samuel Holland 62ff262227
riscv: Use the same CPU operations for all CPUs
RISC-V provides no binding (ACPI or DT) to describe per-cpu start/stop
operations, so cpu_set_ops() will always detect the same operations for
every CPU. Replace the cpu_ops array with a single pointer to save space
and reduce boot time.

Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231121234736.3489608-4-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2024-01-04 15:03:07 -08:00

36 lines
971 B
C

/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
* Based on arch/arm64/include/asm/cpu_ops.h
*/
#ifndef __ASM_CPU_OPS_H
#define __ASM_CPU_OPS_H
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/threads.h>
/**
* struct cpu_operations - Callback operations for hotplugging CPUs.
*
* @cpu_start: Boots a cpu into the kernel.
* @cpu_stop: Makes a cpu leave the kernel. Must not fail. Called from
* the cpu being stopped.
* @cpu_is_stopped: Ensures a cpu has left the kernel. Called from another
* cpu.
*/
struct cpu_operations {
int (*cpu_start)(unsigned int cpu,
struct task_struct *tidle);
#ifdef CONFIG_HOTPLUG_CPU
void (*cpu_stop)(void);
int (*cpu_is_stopped)(unsigned int cpu);
#endif
};
extern const struct cpu_operations cpu_ops_spinwait;
extern const struct cpu_operations *cpu_ops;
void __init cpu_set_ops(void);
#endif /* ifndef __ASM_CPU_OPS_H */