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