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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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bdaff4a331
Don't create "online" control file for BSP (i386/x86_64) since its not removable. We originally added this to support ppc64 if the kernel has support but BIOS indicated no offline support, we just didnt create online files for them. We used the same method in ia64 as well, if we have a cpu taking platform interrupts but cannot be removed if those interrupts cannot be re-targeted to another cpu. Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
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* arch/i386/kernel/topology.c - Populate driverfs 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/init.h>
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#include <linux/smp.h>
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#include <linux/nodemask.h>
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#include <asm/cpu.h>
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static struct i386_cpu cpu_devices[NR_CPUS];
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int arch_register_cpu(int num){
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struct node *parent = NULL;
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#ifdef CONFIG_NUMA
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int node = cpu_to_node(num);
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if (node_online(node))
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parent = &node_devices[node].node;
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#endif /* CONFIG_NUMA */
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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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if (!num)
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cpu_devices[num].cpu.no_control = 1;
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return register_cpu(&cpu_devices[num].cpu, num, parent);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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void arch_unregister_cpu(int num) {
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struct node *parent = NULL;
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#ifdef CONFIG_NUMA
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int node = cpu_to_node(num);
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if (node_online(node))
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parent = &node_devices[node].node;
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#endif /* CONFIG_NUMA */
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return unregister_cpu(&cpu_devices[num].cpu, parent);
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}
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EXPORT_SYMBOL(arch_register_cpu);
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EXPORT_SYMBOL(arch_unregister_cpu);
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#endif /*CONFIG_HOTPLUG_CPU*/
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#ifdef CONFIG_NUMA
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#include <linux/mmzone.h>
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#include <asm/node.h>
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struct i386_node node_devices[MAX_NUMNODES];
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static int __init topology_init(void)
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{
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int i;
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for_each_online_node(i)
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arch_register_node(i);
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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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#else /* !CONFIG_NUMA */
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static int __init topology_init(void)
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{
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int i;
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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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#endif /* CONFIG_NUMA */
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subsys_initcall(topology_init);
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