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