1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
6 #include <linux/kernel.h>
8 #include <linux/sched.h>
10 #include <linux/irq.h>
11 #include <linux/cpu.h>
12 #include <linux/sched/hotplug.h>
14 #include <asm/cpu_ops.h>
18 void arch_cpu_idle_dead(void)
23 bool cpu_has_hotplug(unsigned int cpu)
25 if (cpu_ops[cpu]->cpu_stop)
32 * __cpu_disable runs on the processor to be shutdown.
34 int __cpu_disable(void)
37 unsigned int cpu = smp_processor_id();
39 if (!cpu_ops[cpu] || !cpu_ops[cpu]->cpu_stop)
42 if (cpu_ops[cpu]->cpu_disable)
43 ret = cpu_ops[cpu]->cpu_disable(cpu);
48 remove_cpu_topology(cpu);
49 set_cpu_online(cpu, false);
50 irq_migrate_all_off_this_cpu();
56 * Called on the thread which is asking for a CPU to be shutdown.
58 void __cpu_die(unsigned int cpu)
62 if (!cpu_wait_death(cpu, 5)) {
63 pr_err("CPU %u: didn't die\n", cpu);
66 pr_notice("CPU%u: off\n", cpu);
68 /* Verify from the firmware if the cpu is really stopped*/
69 if (cpu_ops[cpu]->cpu_is_stopped)
70 ret = cpu_ops[cpu]->cpu_is_stopped(cpu);
72 pr_warn("CPU%d may not have stopped: %d\n", cpu, ret);
76 * Called from the idle thread for the CPU which has been shutdown.
82 (void)cpu_report_death();
84 cpu_ops[smp_processor_id()]->cpu_stop();
85 /* It should never reach here */