projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 9c869eda | 2 | * arch/i386/kernel/topology.c - Populate driverfs with topology information |
| 1da177e4 LT |
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 | * | |
| 9c869eda | 9 | * All rights reserved. |
| 1da177e4 LT |
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/init.h> | |
| 29 | #include <linux/smp.h> | |
| 30 | #include <linux/nodemask.h> | |
| 31 | #include <asm/cpu.h> | |
| 32 | ||
| 33 | static struct i386_cpu cpu_devices[NR_CPUS]; | |
| 34 | ||
| 35 | int arch_register_cpu(int num){ | |
| 36 | struct node *parent = NULL; | |
| 9c869eda | 37 | |
| 1da177e4 LT |
38 | #ifdef CONFIG_NUMA |
| 39 | int node = cpu_to_node(num); | |
| 40 | if (node_online(node)) | |
| 41 | parent = &node_devices[node].node; | |
| 42 | #endif /* CONFIG_NUMA */ | |
| 43 | ||
| bdaff4a3 AR |
44 | /* |
| 45 | * CPU0 cannot be offlined due to several | |
| 46 | * restrictions and assumptions in kernel. This basically | |
| 47 | * doesnt add a control file, one cannot attempt to offline | |
| 48 | * BSP. | |
| 49 | */ | |
| 50 | if (!num) | |
| 51 | cpu_devices[num].cpu.no_control = 1; | |
| 52 | ||
| 1da177e4 LT |
53 | return register_cpu(&cpu_devices[num].cpu, num, parent); |
| 54 | } | |
| 55 | ||
| 56 | #ifdef CONFIG_HOTPLUG_CPU | |
| 57 | ||
| 58 | void arch_unregister_cpu(int num) { | |
| 59 | struct node *parent = NULL; | |
| 60 | ||
| 61 | #ifdef CONFIG_NUMA | |
| 62 | int node = cpu_to_node(num); | |
| 63 | if (node_online(node)) | |
| 64 | parent = &node_devices[node].node; | |
| 65 | #endif /* CONFIG_NUMA */ | |
| 66 | ||
| 67 | return unregister_cpu(&cpu_devices[num].cpu, parent); | |
| 68 | } | |
| 69 | EXPORT_SYMBOL(arch_register_cpu); | |
| 70 | EXPORT_SYMBOL(arch_unregister_cpu); | |
| 71 | #endif /*CONFIG_HOTPLUG_CPU*/ | |
| 72 | ||
| 73 | ||
| 74 | ||
| 75 | #ifdef CONFIG_NUMA | |
| 76 | #include <linux/mmzone.h> | |
| 77 | #include <asm/node.h> | |
| 78 | ||
| 79 | struct i386_node node_devices[MAX_NUMNODES]; | |
| 80 | ||
| 81 | static int __init topology_init(void) | |
| 82 | { | |
| 83 | int i; | |
| 84 | ||
| 76e4f660 AR |
85 | for_each_online_node(i) |
| 86 | arch_register_node(i); | |
| 87 | ||
| a888cebe | 88 | for_each_present_cpu(i) |
| 76e4f660 | 89 | arch_register_cpu(i); |
| 1da177e4 LT |
90 | return 0; |
| 91 | } | |
| 92 | ||
| 93 | #else /* !CONFIG_NUMA */ | |
| 94 | ||
| 95 | static int __init topology_init(void) | |
| 96 | { | |
| 97 | int i; | |
| 98 | ||
| a888cebe | 99 | for_each_present_cpu(i) |
| 76e4f660 | 100 | arch_register_cpu(i); |
| 1da177e4 LT |
101 | return 0; |
| 102 | } | |
| 103 | ||
| 104 | #endif /* CONFIG_NUMA */ | |
| 105 | ||
| 106 | subsys_initcall(topology_init); |