LXR linux/arch/sh/kernel/topology.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * arch/sh/kernel/topology.c
   4 *
   5 *  Copyright (C) 2007  Paul Mundt
   6 */
   7#include <linux/cpu.h>
   8#include <linux/cpumask.h>
   9#include <linux/init.h>
  10#include <linux/percpu.h>
  11#include <linux/topology.h>
  12#include <linux/node.h>
  13#include <linux/nodemask.h>
  14#include <linux/export.h>
  15
  16static DEFINE_PER_CPU(struct cpu, cpu_devices);
  17
  18cpumask_t cpu_core_map[NR_CPUS];
  19EXPORT_SYMBOL(cpu_core_map);
  20
  21static cpumask_t cpu_coregroup_map(int cpu)
  22{
  23        /*
  24         * Presently all SH-X3 SMP cores are multi-cores, so just keep it
  25         * simple until we have a method for determining topology..
  26         */
  27        return *cpu_possible_mask;
  28}
  29
  30const struct cpumask *cpu_coregroup_mask(int cpu)
  31{
  32        return &cpu_core_map[cpu];
  33}
  34
  35int arch_update_cpu_topology(void)
  36{
  37        unsigned int cpu;
  38
  39        for_each_possible_cpu(cpu)
  40                cpu_core_map[cpu] = cpu_coregroup_map(cpu);
  41
  42        return 0;
  43}
  44
  45static int __init topology_init(void)
  46{
  47        int i, ret;
  48
  49#ifdef CONFIG_NEED_MULTIPLE_NODES
  50        for_each_online_node(i)
  51                register_one_node(i);
  52#endif
  53
  54        for_each_present_cpu(i) {
  55                struct cpu *c = &per_cpu(cpu_devices, i);
  56
  57                c->hotpluggable = 1;
  58
  59                ret = register_cpu(c, i);
  60                if (unlikely(ret))
  61                        printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
  62                               __func__, i, ret);
  63        }
  64
  65#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
  66        /*
  67         * In the UP case, make sure the CPU association is still
  68         * registered under each node. Without this, sysfs fails
  69         * to make the connection between nodes other than node0
  70         * and cpu0.
  71         */
  72        for_each_online_node(i)
  73                if (i != numa_node_id())
  74                        register_cpu_under_node(raw_smp_processor_id(), i);
  75#endif
  76
  77        return 0;
  78}
  79subsys_initcall(topology_init);
  80