arch/loongarch/kernel/topology.c

   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
  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
  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
  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);