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c78f94f35c
The __cpu_up_stack/task_pointer array is only used for spinwait method now. The per cpu array based lookup is also fragile for platforms with discontiguous/sparse hartids. The spinwait method is only used for M-mode Linux or older firmwares without SBI HSM extension. For general Linux systems, ordered booting method is preferred anyways to support cpu hotplug and kexec. Make sure that __cpu_up_stack/task_pointer is only used for spinwait method. Take this opportunity to rename it to __cpu_spinwait_stack/task_pointer to emphasize the purpose as well. Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Atish Patra <atishp@rivosinc.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
30 lines
733 B
C
30 lines
733 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/errno.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <asm/cpu_ops.h>
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#include <asm/sbi.h>
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#include <asm/smp.h>
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const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
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extern const struct cpu_operations cpu_ops_sbi;
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extern const struct cpu_operations cpu_ops_spinwait;
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void __init cpu_set_ops(int cpuid)
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{
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#if IS_ENABLED(CONFIG_RISCV_SBI)
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if (sbi_probe_extension(SBI_EXT_HSM) > 0) {
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if (!cpuid)
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pr_info("SBI HSM extension detected\n");
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cpu_ops[cpuid] = &cpu_ops_sbi;
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} else
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#endif
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cpu_ops[cpuid] = &cpu_ops_spinwait;
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}
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