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
  23 static cpumask_t cpu_coregroup_map(unsigned int cpu)
  24 {
  25         return *cpu_possible_mask;
  26 }
  27
  28 const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
  29 {
  30         return &cpu_core_map[cpu];
  31 }
  32
  33 int arch_update_cpu_topology(void)
  34 {
  35         unsigned int cpu;
  36
  37         for_each_possible_cpu(cpu)
  38                 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
  39
  40         return 0;
  41 }
  42
  43 static int __init topology_init(void)
  44 {
  45         int i, ret;
  46
  47 #ifdef CONFIG_NEED_MULTIPLE_NODES
  48         for_each_online_node(i)
  49                 register_one_node(i);
  50 #endif
  51
  52         for_each_present_cpu(i) {
  53                 struct cpuinfo_metag *cpuinfo = &per_cpu(cpu_data, i);
  54 #ifdef CONFIG_HOTPLUG_CPU
  55                 cpuinfo->cpu.hotpluggable = 1;
  56 #endif
  57                 ret = register_cpu(&cpuinfo->cpu, i);
  58                 if (unlikely(ret))
  59                         pr_warn("%s: register_cpu %d failed (%d)\n",
  60                                 __func__, i, ret);
  61         }
  62
  63 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
  64         /*
  65          * In the UP case, make sure the CPU association is still
  66          * registered under each node. Without this, sysfs fails
  67          * to make the connection between nodes other than node0
  68          * and cpu0.
  69          */
  70         for_each_online_node(i)
  71                 if (i != numa_node_id())
  72                         register_cpu_under_node(raw_smp_processor_id(), i);
  73 #endif
  74
  75         return 0;
  76 }
  77 subsys_initcall(topology_init);