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non-fatal.c

/*
 * 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/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(struct work_struct *work);
static DECLARE_DELAYED_WORK(mce_work, mce_work_fn);

static void mce_work_fn(struct work_struct *work)
{ 
      on_each_cpu(mce_checkregs, NULL, 1, 1);
      schedule_delayed_work(&mce_work, round_jiffies_relative(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, round_jiffies_relative(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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