mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 00:48:50 +00:00
d9f6e12fb0
Fix ~144 single-word typos in arch/x86/ code comments. Doing this in a single commit should reduce the churn. Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: linux-kernel@vger.kernel.org
167 lines
4 KiB
C
167 lines
4 KiB
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/interrupt.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/export.h>
|
|
#include <linux/mmzone.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/irq.h>
|
|
#include <asm/io_apic.h>
|
|
#include <asm/cpu.h>
|
|
|
|
static DEFINE_PER_CPU(struct x86_cpu, cpu_devices);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
|
|
#ifdef CONFIG_BOOTPARAM_HOTPLUG_CPU0
|
|
static int cpu0_hotpluggable = 1;
|
|
#else
|
|
static int cpu0_hotpluggable;
|
|
static int __init enable_cpu0_hotplug(char *str)
|
|
{
|
|
cpu0_hotpluggable = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("cpu0_hotplug", enable_cpu0_hotplug);
|
|
#endif
|
|
|
|
#ifdef CONFIG_DEBUG_HOTPLUG_CPU0
|
|
/*
|
|
* This function offlines a CPU as early as possible and allows userspace to
|
|
* boot up without the CPU. The CPU can be onlined back by user after boot.
|
|
*
|
|
* This is only called for debugging CPU offline/online feature.
|
|
*/
|
|
int _debug_hotplug_cpu(int cpu, int action)
|
|
{
|
|
int ret;
|
|
|
|
if (!cpu_is_hotpluggable(cpu))
|
|
return -EINVAL;
|
|
|
|
switch (action) {
|
|
case 0:
|
|
ret = remove_cpu(cpu);
|
|
if (!ret)
|
|
pr_info("DEBUG_HOTPLUG_CPU0: CPU %u is now offline\n", cpu);
|
|
else
|
|
pr_debug("Can't offline CPU%d.\n", cpu);
|
|
break;
|
|
case 1:
|
|
ret = add_cpu(cpu);
|
|
if (ret)
|
|
pr_debug("Can't online CPU%d.\n", cpu);
|
|
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __init debug_hotplug_cpu(void)
|
|
{
|
|
_debug_hotplug_cpu(0, 0);
|
|
return 0;
|
|
}
|
|
|
|
late_initcall_sync(debug_hotplug_cpu);
|
|
#endif /* CONFIG_DEBUG_HOTPLUG_CPU0 */
|
|
|
|
int arch_register_cpu(int num)
|
|
{
|
|
struct cpuinfo_x86 *c = &cpu_data(num);
|
|
|
|
/*
|
|
* Currently CPU0 is only hotpluggable on Intel platforms. Other
|
|
* vendors can add hotplug support later.
|
|
* Xen PV guests don't support CPU0 hotplug at all.
|
|
*/
|
|
if (c->x86_vendor != X86_VENDOR_INTEL ||
|
|
boot_cpu_has(X86_FEATURE_XENPV))
|
|
cpu0_hotpluggable = 0;
|
|
|
|
/*
|
|
* Two known BSP/CPU0 dependencies: Resume from suspend/hibernate
|
|
* depends on BSP. PIC interrupts depend on BSP.
|
|
*
|
|
* If the BSP dependencies are under control, one can tell kernel to
|
|
* enable BSP hotplug. This basically adds a control file and
|
|
* one can attempt to offline BSP.
|
|
*/
|
|
if (num == 0 && cpu0_hotpluggable) {
|
|
unsigned int irq;
|
|
/*
|
|
* We won't take down the boot processor on i386 if some
|
|
* interrupts only are able to be serviced by the BSP in PIC.
|
|
*/
|
|
for_each_active_irq(irq) {
|
|
if (!IO_APIC_IRQ(irq) && irq_has_action(irq)) {
|
|
cpu0_hotpluggable = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (num || cpu0_hotpluggable)
|
|
per_cpu(cpu_devices, num).cpu.hotpluggable = 1;
|
|
|
|
return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
|
|
}
|
|
EXPORT_SYMBOL(arch_register_cpu);
|
|
|
|
void arch_unregister_cpu(int num)
|
|
{
|
|
unregister_cpu(&per_cpu(cpu_devices, num).cpu);
|
|
}
|
|
EXPORT_SYMBOL(arch_unregister_cpu);
|
|
#else /* CONFIG_HOTPLUG_CPU */
|
|
|
|
static int __init arch_register_cpu(int num)
|
|
{
|
|
return register_cpu(&per_cpu(cpu_devices, num).cpu, num);
|
|
}
|
|
#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
|
|
|
|
for_each_present_cpu(i)
|
|
arch_register_cpu(i);
|
|
|
|
return 0;
|
|
}
|
|
subsys_initcall(topology_init);
|