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Linux/arch/sh/kernel/topology.c

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  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);
 83 

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