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