arch/loongarch/kernel/topology.c

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