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62ff262227
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>
78 lines
1.5 KiB
C
78 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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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/kernel.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/err.h>
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#include <linux/irq.h>
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#include <linux/cpuhotplug.h>
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#include <linux/cpu.h>
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#include <linux/sched/hotplug.h>
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#include <asm/irq.h>
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#include <asm/cpu_ops.h>
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#include <asm/numa.h>
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#include <asm/smp.h>
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bool cpu_has_hotplug(unsigned int cpu)
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{
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if (cpu_ops->cpu_stop)
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return true;
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return false;
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}
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/*
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* __cpu_disable runs on the processor to be shutdown.
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*/
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int __cpu_disable(void)
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{
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unsigned int cpu = smp_processor_id();
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if (!cpu_ops->cpu_stop)
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return -EOPNOTSUPP;
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remove_cpu_topology(cpu);
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numa_remove_cpu(cpu);
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set_cpu_online(cpu, false);
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riscv_ipi_disable();
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irq_migrate_all_off_this_cpu();
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return 0;
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}
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#ifdef CONFIG_HOTPLUG_CPU
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/*
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* Called on the thread which is asking for a CPU to be shutdown, if the
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* CPU reported dead to the hotplug core.
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*/
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void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
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{
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int ret = 0;
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pr_notice("CPU%u: off\n", cpu);
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/* Verify from the firmware if the cpu is really stopped*/
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if (cpu_ops->cpu_is_stopped)
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ret = cpu_ops->cpu_is_stopped(cpu);
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if (ret)
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pr_warn("CPU%d may not have stopped: %d\n", cpu, ret);
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}
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/*
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* Called from the idle thread for the CPU which has been shutdown.
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*/
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void __noreturn arch_cpu_idle_dead(void)
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{
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idle_task_exit();
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cpuhp_ap_report_dead();
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cpu_ops->cpu_stop();
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/* It should never reach here */
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BUG();
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}
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#endif
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