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/*
* Non Fatal Machine Check Exception Reporting
*
* (C) Copyright 2002 Dave Jones. <davej@codemonkey.org.uk>
*
* This file contains routines to check for non-fatal MCEs every 15s
*
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/config.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/module.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/msr.h>
#include "mce.h"
static int firstbank;
#define MCE_RATE 15*HZ /* timer rate is 15s */
static void mce_checkregs (void *info)
{
u32 low, high;
int i;
for (i=firstbank; i<nr_mce_banks; i++) {
rdmsr (MSR_IA32_MC0_STATUS+i*4, low, high);
if (high & (1<<31)) {
printk(KERN_INFO "MCE: The hardware reports a non "
"fatal, correctable incident occurred on "
"CPU %d.\n",
smp_processor_id());
printk (KERN_INFO "Bank %d: %08x%08x\n", i, high, low);
/* Scrub the error so we don't pick it up in MCE_RATE seconds time. */
wrmsr (MSR_IA32_MC0_STATUS+i*4, 0UL, 0UL);
/* Serialize */
wmb();
add_taint(TAINT_MACHINE_CHECK);
}
}
}
static void mce_work_fn(void *data);
static DECLARE_WORK(mce_work, mce_work_fn, NULL);
static void mce_work_fn(void *data)
{
on_each_cpu(mce_checkregs, NULL, 1, 1);
schedule_delayed_work(&mce_work, MCE_RATE);
}
static int __init init_nonfatal_mce_checker(void)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
/* Check for MCE support */
if (!cpu_has(c, X86_FEATURE_MCE))
return -ENODEV;
/* Check for PPro style MCA */
if (!cpu_has(c, X86_FEATURE_MCA))
return -ENODEV;
/* Some Athlons misbehave when we frob bank 0 */
if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 == 6)
firstbank = 1;
else
firstbank = 0;
/*
* Check for non-fatal errors every MCE_RATE s
*/
schedule_delayed_work(&mce_work, MCE_RATE);
printk(KERN_INFO "Machine check exception polling timer started.\n");
return 0;
}
module_init(init_nonfatal_mce_checker);
MODULE_LICENSE("GPL");
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