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/*
* P6 specific Machine Check Exception Reporting
* (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/msr.h>
#include "mce.h"
/* Machine Check Handler For PII/PIII */
static void intel_machine_check(struct pt_regs *regs, long error_code)
{
int recover = 1;
u32 alow, ahigh, high, low;
u32 mcgstl, mcgsth;
int i;
rdmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
if (mcgstl & (1<<0)) /* Recoverable ? */
recover = 0;
printk(KERN_EMERG "CPU %d: Machine Check Exception: %08x%08x\n",
smp_processor_id(), mcgsth, mcgstl);
for (i = 0; i < nr_mce_banks; i++) {
rdmsr(MSR_IA32_MC0_STATUS+i*4, low, high);
if (high & (1<<31)) {
char misc[20];
char addr[24];
misc[0] = addr[0] = '\0';
if (high & (1<<29))
recover |= 1;
if (high & (1<<25))
recover |= 2;
high &= ~(1<<31);
if (high & (1<<27)) {
rdmsr(MSR_IA32_MC0_MISC+i*4, alow, ahigh);
snprintf(misc, 20, "[%08x%08x]", ahigh, alow);
}
if (high & (1<<26)) {
rdmsr(MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
snprintf(addr, 24, " at %08x%08x", ahigh, alow);
}
printk(KERN_EMERG "CPU %d: Bank %d: %08x%08x%s%s\n",
smp_processor_id(), i, high, low, misc, addr);
}
}
if (recover & 2)
panic("CPU context corrupt");
if (recover & 1)
panic("Unable to continue");
printk(KERN_EMERG "Attempting to continue.\n");
/*
* Do not clear the MSR_IA32_MCi_STATUS if the error is not
* recoverable/continuable.This will allow BIOS to look at the MSRs
* for errors if the OS could not log the error.
*/
for (i = 0; i < nr_mce_banks; i++) {
unsigned int msr;
msr = MSR_IA32_MC0_STATUS+i*4;
rdmsr(msr, low, high);
if (high & (1<<31)) {
/* Clear it */
wrmsr(msr, 0UL, 0UL);
/* Serialize */
wmb();
add_taint(TAINT_MACHINE_CHECK);
}
}
mcgstl &= ~(1<<2);
wrmsr(MSR_IA32_MCG_STATUS, mcgstl, mcgsth);
}
/* Set up machine check reporting for processors with Intel style MCE */
void intel_p6_mcheck_init(struct cpuinfo_x86 *c)
{
u32 l, h;
int i;
/* Check for MCE support */
if (!cpu_has(c, X86_FEATURE_MCE))
return;
/* Check for PPro style MCA */
if (!cpu_has(c, X86_FEATURE_MCA))
return;
/* Ok machine check is available */
machine_check_vector = intel_machine_check;
wmb();
printk(KERN_INFO "Intel machine check architecture supported.\n");
rdmsr(MSR_IA32_MCG_CAP, l, h);
if (l & (1<<8)) /* Control register present ? */
wrmsr(MSR_IA32_MCG_CTL, 0xffffffff, 0xffffffff);
nr_mce_banks = l & 0xff;
/*
* Following the example in IA-32 SDM Vol 3:
* - MC0_CTL should not be written
* - Status registers on all banks should be cleared on reset
*/
for (i = 1; i < nr_mce_banks; i++)
wrmsr(MSR_IA32_MC0_CTL+4*i, 0xffffffff, 0xffffffff);
for (i = 0; i < nr_mce_banks; i++)
wrmsr(MSR_IA32_MC0_STATUS+4*i, 0x0, 0x0);
set_in_cr4(X86_CR4_MCE);
printk(KERN_INFO "Intel machine check reporting enabled on CPU#%d.\n",
smp_processor_id());
}
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