arch/metag/kernel/topology.c

   1 /*
   2  *  Copyright (C) 2007  Paul Mundt
   3  *  Copyright (C) 2010  Imagination Technolohies Ltd.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License.  See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  */
   9 #include <linux/cpu.h>
  10 #include <linux/cpumask.h>
  11 #include <linux/init.h>
  12 #include <linux/percpu.h>
  13 #include <linux/node.h>
  14 #include <linux/nodemask.h>
  15 #include <linux/topology.h>
  16
  17 #include <asm/cpu.h>
  18
  19 DEFINE_PER_CPU(struct cpuinfo_metag, cpu_data);
  20
  21 cpumask_t cpu_core_map[NR_CPUS];
  22 EXPORT_SYMBOL(cpu_core_map);
  23
  24 static cpumask_t cpu_coregroup_map(unsigned int cpu)
  25 {
  26         return *cpu_possible_mask;
  27 }
  28
  29 const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
  30 {
  31         return &cpu_core_map[cpu];
  32 }
  33
  34 int arch_update_cpu_topology(void)
  35 {
  36         unsigned int cpu;
  37
  38         for_each_possible_cpu(cpu)
  39                 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
  40
  41         return 0;
  42 }
  43
  44 static int __init topology_init(void)
  45 {
  46         int i, ret;
  47
  48 #ifdef CONFIG_NEED_MULTIPLE_NODES
  49         for_each_online_node(i)
  50                 register_one_node(i);
  51 #endif
  52
  53         for_each_present_cpu(i) {
  54                 struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
  55 #ifdef CONFIG_HOTPLUG_CPU
  56                 cpuinfo->cpu.hotpluggable = 1;
  57 #endif
  58                 ret = register_cpu(&cpuinfo->cpu, i);
  59                 if (unlikely(ret))
  60                         pr_warn("%s: register_cpu %d failed (%d)\n",
  61                                 __func__, i, ret);
  62         }
  63
  64 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
  65         /*
  66          * In the UP case, make sure the CPU association is still
  67          * registered under each node. Without this, sysfs fails
  68          * to make the connection between nodes other than node0
  69          * and cpu0.
  70          */
  71         for_each_online_node(i)
  72                 if (i != numa_node_id())
  73                         register_cpu_under_node(raw_smp_processor_id(), i);
  74 #endif
  75
  76         return 0;
  77 }
  78 subsys_initcall(topology_init);