topology.c

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/*
 * arch/sh/kernel/topology.c
 *
 *  Copyright (C) 2007  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/cpu.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <linux/topology.h>
#include <linux/node.h>
#include <linux/nodemask.h>
#include <linux/export.h>

static DEFINE_PER_CPU(struct cpu, cpu_devices);

cpumask_t cpu_core_map[NR_CPUS];
EXPORT_SYMBOL(cpu_core_map);

static cpumask_t cpu_coregroup_map(unsigned int cpu)
{
    /*
     * Presently all SH-X3 SMP cores are multi-cores, so just keep it
     * simple until we have a method for determining topology..
     */
    return *cpu_possible_mask;
}

const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
{
    return &cpu_core_map[cpu];
}

int arch_update_cpu_topology(void)
{
    unsigned int cpu;

    for_each_possible_cpu(cpu)
        cpu_core_map[cpu] = cpu_coregroup_map(cpu);

    return 0;
}

static int __init topology_init(void)
{
    int i, ret;

#ifdef CONFIG_NEED_MULTIPLE_NODES
    for_each_online_node(i)
        register_one_node(i);
#endif

    for_each_present_cpu(i) {
        struct cpu *c = &per_cpu(cpu_devices, i);

        c->hotpluggable = 1;

        ret = register_cpu(c, i);
        if (unlikely(ret))
            printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
                   __func__, i, ret);
    }

#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
    /*
     * In the UP case, make sure the CPU association is still
     * registered under each node. Without this, sysfs fails
     * to make the connection between nodes other than node0
     * and cpu0.
     */
    for_each_online_node(i)
        if (i != numa_node_id())
            register_cpu_under_node(raw_smp_processor_id(), i);
#endif

    return 0;
}
subsys_initcall(topology_init);