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 17static DEFINE_PER_CPU(struct cpu, cpu_devices); 18 19cpumask_t cpu_core_map[NR_CPUS]; 20 21static 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 30const struct cpumask *cpu_coregroup_mask(unsigned int cpu) 31{ 32 return &cpu_core_map[cpu]; 33} 34 35int 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 45static 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 struct cpu *c = &per_cpu(cpu_devices, i); 56 57 c->hotpluggable = 1; 58 59 ret = register_cpu(c, i); 60 if (unlikely(ret)) 61 printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n", 62 __func__, i, ret); 63 } 64 65#if defined(CONFIG_NUMA) && !defined(CONFIG_SMP) 66 /* 67 * In the UP case, make sure the CPU association is still 68 * registered under each node. Without this, sysfs fails 69 * to make the connection between nodes other than node0 70 * and cpu0. 71 */ 72 for_each_online_node(i) 73 if (i != numa_node_id()) 74 register_cpu_under_node(raw_smp_processor_id(), i); 75#endif 76 77 return 0; 78} 79subsys_initcall(topology_init); 80