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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Populate sysfs with topology information
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*
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* Written by: Matthew Dobson, IBM Corporation
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* Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*/
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#include <linux/nodemask.h>
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#include <linux/mmzone.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <asm/cpu.h>
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static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
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#ifdef CONFIG_HOTPLUG_CPU
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int __ref arch_register_cpu(int num)
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{
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/*
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* CPU0 cannot be offlined due to several
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* restrictions and assumptions in kernel. This basically
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* doesnt add a control file, one cannot attempt to offline
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* BSP.
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*
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* Also certain PCI quirks require not to enable hotplug control
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* for all CPU's.
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*/
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if (num)
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per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
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return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
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}
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EXPORT_SYMBOL(arch_register_cpu);
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void arch_unregister_cpu(int num)
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{
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unregister_cpu(&per_cpu(cpu_devices, num).cpu);
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}
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EXPORT_SYMBOL(arch_unregister_cpu);
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#else /* CONFIG_HOTPLUG_CPU */
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static int __init arch_register_cpu(int num)
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{
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return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
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}
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#endif /* CONFIG_HOTPLUG_CPU */
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static int __init topology_init(void)
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{
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int i;
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#ifdef CONFIG_NUMA
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for_each_online_node(i)
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register_one_node(i);
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#endif
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for_each_present_cpu(i)
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arch_register_cpu(i);
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return 0;
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}
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subsys_initcall(topology_init);
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