1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/acpi.h>
3 #include <linux/cpu.h>
4 #include <linux/cpumask.h>
5 #include <linux/init.h>
6 #include <linux/node.h>
7 #include <linux/nodemask.h>
8 #include <linux/percpu.h>
9 #include <asm/bootinfo.h>
10
11 #include <acpi/processor.h>
12
13 static DEFINE_PER_CPU(struct cpu, cpu_devices);
14
15 #ifdef CONFIG_HOTPLUG_CPU
arch_register_cpu(int cpu)16 int arch_register_cpu(int cpu)
17 {
18 int ret;
19 struct cpu *c = &per_cpu(cpu_devices, cpu);
20
21 c->hotpluggable = 1;
22 ret = register_cpu(c, cpu);
23 if (ret < 0)
24 pr_warn("register_cpu %d failed (%d)\n", cpu, ret);
25
26 return ret;
27 }
28 EXPORT_SYMBOL(arch_register_cpu);
29
arch_unregister_cpu(int cpu)30 void arch_unregister_cpu(int cpu)
31 {
32 struct cpu *c = &per_cpu(cpu_devices, cpu);
33
34 c->hotpluggable = 0;
35 unregister_cpu(c);
36 }
37 EXPORT_SYMBOL(arch_unregister_cpu);
38 #endif
39
topology_init(void)40 static int __init topology_init(void)
41 {
42 int i, ret;
43
44 for_each_present_cpu(i) {
45 struct cpu *c = &per_cpu(cpu_devices, i);
46
47 c->hotpluggable = !io_master(i);
48 ret = register_cpu(c, i);
49 if (ret < 0)
50 pr_warn("topology_init: register_cpu %d failed (%d)\n", i, ret);
51 }
52
53 return 0;
54 }
55
56 subsys_initcall(topology_init);
57