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Linux/arch/metag/kernel/topology.c

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  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);
 78 

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