linux/arch/metag/kernel/topology.c
<<
>>
Prefs
   1/*
   2 *  Copyright (C) 2007  Paul Mundt
   3 *  Copyright (C) 2010  Imagination Technolohies Ltd.
   4 *
   5 * This file is subject to the terms and conditions of the GNU General Public
   6 * License.  See the file "COPYING" in the main directory of this archive
   7 * for more details.
   8 */
   9#include <linux/cpu.h>
  10#include <linux/cpumask.h>
  11#include <linux/init.h>
  12#include <linux/percpu.h>
  13#include <linux/node.h>
  14#include <linux/nodemask.h>
  15#include <linux/topology.h>
  16
  17#include <asm/cpu.h>
  18
  19DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);
  20
  21cpumask_t cpu_core_map[NR_CPUS];
  22
  23static cpumask_t cpu_coregroup_map(unsigned int cpu)
  24{
  25        return *cpu_possible_mask;
  26}
  27
  28const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
  29{
  30        return &cpu_core_map[cpu];
  31}
  32
  33int arch_update_cpu_topology(void)
  34{
  35        unsigned int cpu;
  36
  37        for_each_possible_cpu(cpu)
  38                cpu_core_map[cpu] = cpu_coregroup_map(cpu);
  39
  40        return 0;
  41}
  42
  43static int __init topology_init(void)
  44{
  45        int i, ret;
  46
  47#ifdef CONFIG_NEED_MULTIPLE_NODES
  48        for_each_online_node(i)
  49                register_one_node(i);
  50#endif
  51
  52        for_each_present_cpu(i) {
  53                struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
  54#ifdef CONFIG_HOTPLUG_CPU
  55                cpuinfo->cpu.hotpluggable = 1;
  56#endif
  57                ret = register_cpu(&cpuinfo->cpu, i);
  58                if (unlikely(ret))
  59                        pr_warn("%s: register_cpu %d failed (%d)\n",
  60                                __func__, i, ret);
  61        }
  62
  63#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
  64        /*
  65         * In the UP case, make sure the CPU association is still
  66         * registered under each node. Without this, sysfs fails
  67         * to make the connection between nodes other than node0
  68         * and cpu0.
  69         */
  70        for_each_online_node(i)
  71                if (i != numa_node_id())
  72                        register_cpu_under_node(raw_smp_processor_id(), i);
  73#endif
  74
  75        return 0;
  76}
  77subsys_initcall(topology_init);
  78