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/node.h> 15 #include <linux/nodemask.h> 16 17 static DEFINE_PER_CPU(struct cpu, cpu_devices); 18 19 cpumask_t cpu_core_map[NR_CPUS]; 20 EXPORT_SYMBOL(cpu_core_map); 21 22 static cpumask_t cpu_coregroup_map(unsigned int cpu) 23 { 24 /* 25 * Presently all SH-X3 SMP cores are multi-cores, so just keep it 26 * simple until we have a method for determining topology.. 27 */ 28 return cpu_possible_map; 29 } 30 31 const struct cpumask *cpu_coregroup_mask(unsigned int cpu) 32 { 33 return &cpu_core_map[cpu]; 34 } 35 36 int arch_update_cpu_topology(void) 37 { 38 unsigned int cpu; 39 40 for_each_possible_cpu(cpu) 41 cpu_core_map[cpu] = cpu_coregroup_map(cpu); 42 43 return 0; 44 } 45 46 static int __init topology_init(void) 47 { 48 int i, ret; 49 50 #ifdef CONFIG_NEED_MULTIPLE_NODES 51 for_each_online_node(i) 52 register_one_node(i); 53 #endif 54 55 for_each_present_cpu(i) { 56 struct cpu *c = &per_cpu(cpu_devices, i); 57 58 c->hotpluggable = 1; 59 60 ret = register_cpu(c, i); 61 if (unlikely(ret)) 62 printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n", 63 __func__, i, ret); 64 } 65 66 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) 67 /* 68 * In the UP case, make sure the CPU association is still 69 * registered under each node. Without this, sysfs fails 70 * to make the connection between nodes other than node0 71 * and cpu0. 72 */ 73 for_each_online_node(i) 74 if (i != numa_node_id()) 75 register_cpu_under_node(raw_smp_processor_id(), i); 76 #endif 77 78 return 0; 79 } 80 subsys_initcall(topology_init); 81