1 /* 2 * Populate sysfs with topology information 3 * 4 * Written by: Matthew Dobson, IBM Corporation 5 * Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL 6 * 7 * Copyright (C) 2002, IBM Corp. 8 * 9 * All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 19 * NON INFRINGEMENT. See the GNU General Public License for more 20 * details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * Send feedback to <colpatch@us.ibm.com> 27 */ 28 #include <linux/nodemask.h> 29 #include <linux/export.h> 30 #include <linux/mmzone.h> 31 #include <linux/init.h> 32 #include <linux/smp.h> 33 #include <asm/cpu.h> 34 35 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices); 36 37 #ifdef CONFIG_HOTPLUG_CPU 38 int __ref arch_register_cpu(int num) 39 { 40 /* 41 * CPU0 cannot be offlined due to several 42 * restrictions and assumptions in kernel. This basically 43 * doesn't add a control file, one cannot attempt to offline 44 * BSP. 45 * 46 * Also certain PCI quirks require not to enable hotplug control 47 * for all CPU's. 48 */ 49 if (num) 50 per_cpu(cpu_devices, num).cpu.hotpluggable = 1; 51 52 return register_cpu(&per_cpu(cpu_devices, num).cpu, num); 53 } 54 EXPORT_SYMBOL(arch_register_cpu); 55 56 void arch_unregister_cpu(int num) 57 { 58 unregister_cpu(&per_cpu(cpu_devices, num).cpu); 59 } 60 EXPORT_SYMBOL(arch_unregister_cpu); 61 #else /* CONFIG_HOTPLUG_CPU */ 62 63 static int __init arch_register_cpu(int num) 64 { 65 return register_cpu(&per_cpu(cpu_devices, num).cpu, num); 66 } 67 #endif /* CONFIG_HOTPLUG_CPU */ 68 69 static int __init topology_init(void) 70 { 71 int i; 72 73 #ifdef CONFIG_NUMA 74 for_each_online_node(i) 75 register_one_node(i); 76 #endif 77 78 for_each_present_cpu(i) 79 arch_register_cpu(i); 80 81 return 0; 82 } 83 subsys_initcall(topology_init); 84