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/*
* arch/i386/kernel/topology.c - Populate driverfs 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 <asm/cpu.h>
static struct i386_cpu cpu_devices[NR_CPUS];
int arch_register_cpu(int num){
struct node *parent = NULL;
#ifdef CONFIG_NUMA
int node = cpu_to_node(num);
if (node_online(node))
parent = &node_devices[parent_node(node)];
#endif /* CONFIG_NUMA */
/*
* 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.
*/
if (!num)
cpu_devices[num].cpu.no_control = 1;
return register_cpu(&cpu_devices[num].cpu, num, parent);
}
#ifdef CONFIG_HOTPLUG_CPU
void arch_unregister_cpu(int num) {
struct node *parent = NULL;
#ifdef CONFIG_NUMA
int node = cpu_to_node(num);
if (node_online(node))
parent = &node_devices[parent_node(node)];
#endif /* CONFIG_NUMA */
return unregister_cpu(&cpu_devices[num].cpu, parent);
}
EXPORT_SYMBOL(arch_register_cpu);
EXPORT_SYMBOL(arch_unregister_cpu);
#endif /*CONFIG_HOTPLUG_CPU*/
#ifdef CONFIG_NUMA
#include <linux/mmzone.h>
static int __init topology_init(void)
{
int i;
for_each_online_node(i)
register_one_node(i);
for_each_present_cpu(i)
arch_register_cpu(i);
return 0;
}
#else /* !CONFIG_NUMA */
static int __init topology_init(void)
{
int i;
for_each_present_cpu(i)
arch_register_cpu(i);
return 0;
}
#endif /* CONFIG_NUMA */
subsys_initcall(topology_init);
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