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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Dave Jones835c34a2007-10-12 21:10:53 -04002 * Populate sysfs with topology information
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
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 *
Zachary Amsden9c869ed2006-02-24 13:04:27 -08009 * All rights reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/nodemask.h>
Magnus Dammaada06c2006-09-26 10:52:35 +020029#include <linux/mmzone.h>
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053030#include <linux/init.h>
31#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/cpu.h>
33
travis@sgi.com30964d52008-01-30 13:33:11 +010034static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborg3eaf5ef2008-01-30 13:33:37 +010036#ifdef CONFIG_HOTPLUG_CPU
Sam Ravnborg177c7712008-02-17 13:22:49 +010037int __ref arch_register_cpu(int num)
KAMEZAWA Hiroyuki76b67ed2006-06-27 02:53:41 -070038{
Ashok Rajbdaff4a2006-03-23 02:59:57 -080039 /*
40 * CPU0 cannot be offlined due to several
41 * restrictions and assumptions in kernel. This basically
42 * doesnt add a control file, one cannot attempt to offline
43 * BSP.
Siddha, Suresh Bfd6d7d22006-12-07 02:14:10 +010044 *
45 * Also certain PCI quirks require not to enable hotplug control
46 * for all CPU's.
Ashok Rajbdaff4a2006-03-23 02:59:57 -080047 */
Adrian Bunka850cef2007-10-17 18:04:38 +020048 if (num)
travis@sgi.com30964d52008-01-30 13:33:11 +010049 per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053050
travis@sgi.com30964d52008-01-30 13:33:11 +010051 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
Sam Ravnborg3eaf5ef2008-01-30 13:33:37 +010053EXPORT_SYMBOL(arch_register_cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Andrew Mortonda54bec2007-12-04 17:19:07 +010055void arch_unregister_cpu(int num)
56{
Harvey Harrison9583d052008-02-09 23:24:08 +010057 unregister_cpu(&per_cpu(cpu_devices, num).cpu);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
Linus Torvalds1da177e2005-04-16 15:20:36 -070059EXPORT_SYMBOL(arch_unregister_cpu);
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053060#else /* CONFIG_HOTPLUG_CPU */
61
Alexander van Heukelumd9874022008-02-01 17:49:43 +010062static int __init arch_register_cpu(int num)
Sam Ravnborg3eaf5ef2008-01-30 13:33:37 +010063{
64 return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
65}
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053066#endif /* CONFIG_HOTPLUG_CPU */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Magnus Dammaada06c2006-09-26 10:52:35 +020068static int __init topology_init(void)
69{
70 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72#ifdef CONFIG_NUMA
Ashok Raj76e4f662005-06-25 14:55:00 -070073 for_each_online_node(i)
Yasunori Goto0fc44152006-06-27 02:53:38 -070074 register_one_node(i);
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053075#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Magnus Dammaada06c2006-09-26 10:52:35 +020077 for_each_present_cpu(i)
78 arch_register_cpu(i);
Jaswinder Singh Rajput271eb5c2009-03-21 16:55:24 +053079
Magnus Dammaada06c2006-09-26 10:52:35 +020080 return 0;
81}
Linus Torvalds1da177e2005-04-16 15:20:36 -070082subsys_initcall(topology_init);