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87 lines
1.6 KiB
87 lines
1.6 KiB
// 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/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/sbi.h> |
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void cpu_stop(void); |
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void arch_cpu_idle_dead(void) |
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{ |
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cpu_stop(); |
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} |
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bool cpu_has_hotplug(unsigned int cpu) |
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{ |
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if (cpu_ops[cpu]->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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int ret = 0; |
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unsigned int cpu = smp_processor_id(); |
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if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_stop) |
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return -EOPNOTSUPP; |
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if (cpu_ops[cpu]->cpu_disable) |
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ret = cpu_ops[cpu]->cpu_disable(cpu); |
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if (ret) |
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return ret; |
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remove_cpu_topology(cpu); |
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set_cpu_online(cpu, false); |
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irq_migrate_all_off_this_cpu(); |
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return ret; |
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} |
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/* |
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* Called on the thread which is asking for a CPU to be shutdown. |
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*/ |
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void __cpu_die(unsigned int cpu) |
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{ |
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int ret = 0; |
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if (!cpu_wait_death(cpu, 5)) { |
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pr_err("CPU %u: didn't die\n", cpu); |
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return; |
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} |
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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]->cpu_is_stopped) |
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ret = cpu_ops[cpu]->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 cpu_stop(void) |
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{ |
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idle_task_exit(); |
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(void)cpu_report_death(); |
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cpu_ops[smp_processor_id()]->cpu_stop(); |
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/* It should never reach here */ |
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BUG(); |
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}
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