Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Dave Jones | 835c34a | 2007-10-12 21:10:53 -0400 | [diff] [blame] | 2 | * Populate sysfs with topology information |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Zachary Amsden | 9c869ed | 2006-02-24 13:04:27 -0800 | [diff] [blame] | 9 | * All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/nodemask.h> |
Magnus Damm | aada06c | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 29 | #include <linux/mmzone.h> |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 30 | #include <linux/init.h> |
| 31 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <asm/cpu.h> |
| 33 | |
travis@sgi.com | 30964d5 | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 34 | static DEFINE_PER_CPU(struct x86_cpu, cpu_devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Sam Ravnborg | 3eaf5ef | 2008-01-30 13:33:37 +0100 | [diff] [blame] | 36 | #ifdef CONFIG_HOTPLUG_CPU |
Sam Ravnborg | 177c771 | 2008-02-17 13:22:49 +0100 | [diff] [blame] | 37 | int __ref arch_register_cpu(int num) |
KAMEZAWA Hiroyuki | 76b67ed | 2006-06-27 02:53:41 -0700 | [diff] [blame] | 38 | { |
Ashok Raj | bdaff4a | 2006-03-23 02:59:57 -0800 | [diff] [blame] | 39 | /* |
| 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 B | fd6d7d2 | 2006-12-07 02:14:10 +0100 | [diff] [blame] | 44 | * |
| 45 | * Also certain PCI quirks require not to enable hotplug control |
| 46 | * for all CPU's. |
Ashok Raj | bdaff4a | 2006-03-23 02:59:57 -0800 | [diff] [blame] | 47 | */ |
Adrian Bunk | a850cef | 2007-10-17 18:04:38 +0200 | [diff] [blame] | 48 | if (num) |
travis@sgi.com | 30964d5 | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 49 | per_cpu(cpu_devices, num).cpu.hotpluggable = 1; |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 50 | |
travis@sgi.com | 30964d5 | 2008-01-30 13:33:11 +0100 | [diff] [blame] | 51 | return register_cpu(&per_cpu(cpu_devices, num).cpu, num); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | } |
Sam Ravnborg | 3eaf5ef | 2008-01-30 13:33:37 +0100 | [diff] [blame] | 53 | EXPORT_SYMBOL(arch_register_cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Andrew Morton | da54bec | 2007-12-04 17:19:07 +0100 | [diff] [blame] | 55 | void arch_unregister_cpu(int num) |
| 56 | { |
Harvey Harrison | 9583d05 | 2008-02-09 23:24:08 +0100 | [diff] [blame] | 57 | unregister_cpu(&per_cpu(cpu_devices, num).cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | EXPORT_SYMBOL(arch_unregister_cpu); |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 60 | #else /* CONFIG_HOTPLUG_CPU */ |
| 61 | |
Alexander van Heukelum | d987402 | 2008-02-01 17:49:43 +0100 | [diff] [blame] | 62 | static int __init arch_register_cpu(int num) |
Sam Ravnborg | 3eaf5ef | 2008-01-30 13:33:37 +0100 | [diff] [blame] | 63 | { |
| 64 | return register_cpu(&per_cpu(cpu_devices, num).cpu, num); |
| 65 | } |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 66 | #endif /* CONFIG_HOTPLUG_CPU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
Magnus Damm | aada06c | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 68 | static int __init topology_init(void) |
| 69 | { |
| 70 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
| 72 | #ifdef CONFIG_NUMA |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 73 | for_each_online_node(i) |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 74 | register_one_node(i); |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 75 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Magnus Damm | aada06c | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 77 | for_each_present_cpu(i) |
| 78 | arch_register_cpu(i); |
Jaswinder Singh Rajput | 271eb5c | 2009-03-21 16:55:24 +0530 | [diff] [blame] | 79 | |
Magnus Damm | aada06c | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 80 | return 0; |
| 81 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | subsys_initcall(topology_init); |