diff options
Diffstat (limited to 'arch/x86/kernel/topology.c')
| -rw-r--r-- | arch/x86/kernel/topology.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/arch/x86/kernel/topology.c b/arch/x86/kernel/topology.c new file mode 100644 index 000000000000..45782356a618 --- /dev/null +++ b/arch/x86/kernel/topology.c @@ -0,0 +1,77 @@ +/* + * arch/i386/kernel/topology.c - Populate sysfs with topology information + * + * Written by: Matthew Dobson, IBM Corporation + * Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL + * + * Copyright (C) 2002, IBM Corp. + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <colpatch@us.ibm.com> + */ +#include <linux/init.h> +#include <linux/smp.h> +#include <linux/nodemask.h> +#include <linux/mmzone.h> +#include <asm/cpu.h> + +static struct i386_cpu cpu_devices[NR_CPUS]; + +int arch_register_cpu(int num) +{ + /* + * CPU0 cannot be offlined due to several + * restrictions and assumptions in kernel. This basically + * doesnt add a control file, one cannot attempt to offline + * BSP. + * + * Also certain PCI quirks require not to enable hotplug control + * for all CPU's. + */ + if (num && enable_cpu_hotplug) + cpu_devices[num].cpu.hotpluggable = 1; + + return register_cpu(&cpu_devices[num].cpu, num); +} + +#ifdef CONFIG_HOTPLUG_CPU +int enable_cpu_hotplug = 1; + +void arch_unregister_cpu(int num) { + return unregister_cpu(&cpu_devices[num].cpu); +} +EXPORT_SYMBOL(arch_register_cpu); +EXPORT_SYMBOL(arch_unregister_cpu); +#endif /*CONFIG_HOTPLUG_CPU*/ + +static int __init topology_init(void) +{ + int i; + +#ifdef CONFIG_NUMA + for_each_online_node(i) + register_one_node(i); +#endif /* CONFIG_NUMA */ + + for_each_present_cpu(i) + arch_register_cpu(i); + return 0; +} + +subsys_initcall(topology_init); |