/* * 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");