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linux/arch/riscv/include/asm/cpu_ops_sbi.h

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RISC-V: Avoid using per cpu array for ordered booting Currently both order booting and spinwait approach uses a per cpu array to update stack & task pointer. This approach will not work for the following cases. 1. If NR_CPUs are configured to be less than highest hart id. 2. A platform has sparse hartid. This issue can be fixed for ordered booting as the booting cpu brings up one cpu at a time using SBI HSM extension which has opaque parameter that is unused until now. Introduce a common secondary boot data structure that can store the stack and task pointer. Secondary harts will use this data while booting up to setup the sp & tp. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-01-20 02:09:13 -07:00
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2021 by Rivos Inc.
*/
#ifndef __ASM_CPU_OPS_SBI_H
#define __ASM_CPU_OPS_SBI_H
#ifndef __ASSEMBLY__
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/threads.h>
riscv: ensure cpu_ops_sbi is declared Sparse complains that cpu_ops_sbi is used undeclared: arch/riscv/kernel/cpu_ops_sbi.c:17:29: warning: symbol 'cpu_ops_sbi' was not declared. Should it be static? Fix the warning by adding cpu_ops_sbi to cpu_ops_sbi.h & including that where used. Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20220714080235.3853374-1-conor.dooley@microchip.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-07-14 01:02:36 -07:00
extern const struct cpu_operations cpu_ops_sbi;
RISC-V: Avoid using per cpu array for ordered booting Currently both order booting and spinwait approach uses a per cpu array to update stack & task pointer. This approach will not work for the following cases. 1. If NR_CPUs are configured to be less than highest hart id. 2. A platform has sparse hartid. This issue can be fixed for ordered booting as the booting cpu brings up one cpu at a time using SBI HSM extension which has opaque parameter that is unused until now. Introduce a common secondary boot data structure that can store the stack and task pointer. Secondary harts will use this data while booting up to setup the sp & tp. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2022-01-20 02:09:13 -07:00
/**
* struct sbi_hart_boot_data - Hart specific boot used during booting and
* cpu hotplug.
* @task_ptr: A pointer to the hart specific tp
* @stack_ptr: A pointer to the hart specific sp
*/
struct sbi_hart_boot_data {
void *task_ptr;
void *stack_ptr;
};
#endif
#endif /* ifndef __ASM_CPU_OPS_SBI_H */
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