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