arch/sh/kernel/topology.c

   1 /*
   2  * arch/sh/kernel/topology.c
   3  *
   4  *  Copyright (C) 2007  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/cpu.h>
  11 #include <linux/cpumask.h>
  12 #include <linux/init.h>
  13 #include <linux/percpu.h>
  14 #include <linux/topology.h>
  15 #include <linux/node.h>
  16 #include <linux/nodemask.h>
  17 #include <linux/export.h>
  18
  19 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  20
  21 cpumask_t cpu_core_map[NR_CPUS];
  22 EXPORT_SYMBOL(cpu_core_map);
  23
  24 static cpumask_t cpu_coregroup_map(int cpu)
  25 {
  26         /*
  27          * Presently all SH-X3 SMP cores are multi-cores, so just keep it
  28          * simple until we have a method for determining topology..
  29          */
  30         return *cpu_possible_mask;
  31 }
  32
  33 const struct cpumask *cpu_coregroup_mask(int cpu)
  34 {
  35         return &cpu_core_map[cpu];
  36 }
  37
  38 int arch_update_cpu_topology(void)
  39 {
  40         unsigned int cpu;
  41
  42         for_each_possible_cpu(cpu)
  43                 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
  44
  45         return 0;
  46 }
  47
  48 static int __init topology_init(void)
  49 {
  50         int i, ret;
  51
  52 #ifdef CONFIG_NEED_MULTIPLE_NODES
  53         for_each_online_node(i)
  54                 register_one_node(i);
  55 #endif
  56
  57         for_each_present_cpu(i) {
  58                 struct cpu *c = &per_cpu(cpu_devices, i);
  59
  60                 c->hotpluggable = 1;
  61
  62                 ret = register_cpu(c, i);
  63                 if (unlikely(ret))
  64                         printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
  65                                __func__, i, ret);
  66         }
  67
  68 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
  69         /*
  70          * In the UP case, make sure the CPU association is still
  71          * registered under each node. Without this, sysfs fails
  72          * to make the connection between nodes other than node0
  73          * and cpu0.
  74          */
  75         for_each_online_node(i)
  76                 if (i != numa_node_id())
  77                         register_cpu_under_node(raw_smp_processor_id(), i);
  78 #endif
  79
  80         return 0;
  81 }
  82 subsys_initcall(topology_init);