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