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[PATCH] x86_64: Create per CPU machine check sysfs directories 

This patch will create machinecheck sysdev directories per CPU.  All of the
cpus still share the same ctl banks.  When compiled with CONFIG_HOTPLUG_CPU,
it will also bring up/down sysdev directories as cpus go up/down.  I have
tested the patch along with CONFIG_HOTPLUG_CPU option on in 2.6.13-rc1 kernel.

Minor changes by AK: remove useless unload function

Signed-off-by: Jacob Shin <jacob.shin@amd.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Andi Kleen 2005-07-28 21:15:39 -07:00 committed by Linus Torvalds
parent 69cb62eb6d
commit 91c6d40094
1 changed files with 74 additions and 19 deletions
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93
arch/x86_64/kernel/mce.c
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@ -15,6 +15,8 @@
#include <linux/sysdev.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/cpu.h>
#include <linux/percpu.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/mce.h>
@ -514,10 +516,7 @@ static struct sysdev_class mce_sysclass = {
set_kset_name("machinecheck"),
};
static struct sys_device device_mce = {
.id = 0,
.cls = &mce_sysclass,
};
static DEFINE_PER_CPU(struct sys_device, device_mce);
/* Why are there no generic functions for this? */
#define ACCESSOR(name, var, start) \
@ -542,27 +541,83 @@ ACCESSOR(bank4ctl,bank[4],mce_restart())
ACCESSOR(tolerant,tolerant,)
ACCESSOR(check_interval,check_interval,mce_restart())
static __cpuinit int mce_init_device(void)
/* Per cpu sysdev init. All of the cpus still share the same ctl bank */
static __cpuinit int mce_create_device(unsigned int cpu)
{
int err;
if (!mce_available(&cpu_data[cpu]))
return -EIO;
per_cpu(device_mce,cpu).id = cpu;
per_cpu(device_mce,cpu).cls = &mce_sysclass;
err = sysdev_register(&per_cpu(device_mce,cpu));
if (!err) {
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank0ctl);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank1ctl);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank2ctl);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank3ctl);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_bank4ctl);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_tolerant);
sysdev_create_file(&per_cpu(device_mce,cpu), &attr_check_interval);
}
return err;
}
#ifdef CONFIG_HOTPLUG_CPU
static __cpuinit void mce_remove_device(unsigned int cpu)
{
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank0ctl);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank1ctl);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank2ctl);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank3ctl);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_bank4ctl);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_tolerant);
sysdev_remove_file(&per_cpu(device_mce,cpu), &attr_check_interval);
sysdev_unregister(&per_cpu(device_mce,cpu));
}
#endif
/* Get notified when a cpu comes on/off. Be hotplug friendly. */
static __cpuinit int
mce_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
switch (action) {
case CPU_ONLINE:
mce_create_device(cpu);
break;
#ifdef CONFIG_HOTPLUG_CPU
case CPU_DEAD:
mce_remove_device(cpu);
break;
#endif
}
return NOTIFY_OK;
}
static struct notifier_block mce_cpu_notifier = {
.notifier_call = mce_cpu_callback,
};
static __init int mce_init_device(void)
{
int err;
int i = 0;
if (!mce_available(&boot_cpu_data))
return -EIO;
err = sysdev_class_register(&mce_sysclass);
if (!err)
err = sysdev_register(&device_mce);
if (!err) {
/* could create per CPU objects, but it is not worth it. */
sysdev_create_file(&device_mce, &attr_bank0ctl);
sysdev_create_file(&device_mce, &attr_bank1ctl);
sysdev_create_file(&device_mce, &attr_bank2ctl);
sysdev_create_file(&device_mce, &attr_bank3ctl);
sysdev_create_file(&device_mce, &attr_bank4ctl);
sysdev_create_file(&device_mce, &attr_tolerant);
sysdev_create_file(&device_mce, &attr_check_interval);
}
for_each_online_cpu(i) {
mce_create_device(i);
}
register_cpu_notifier(&mce_cpu_notifier);
misc_register(&mce_log_device);
return err;
}
device_initcall(mce_init_device);