c18db0d7e2
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
|
|
* P6 specific Machine Check Exception Reporting
|
|
* (C) Copyright 2002 Alan Cox <alan@redhat.com>
|
|
*/
|
|
|
|
#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 fastcall 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)) {
|
|
if (high & (1<<29))
|
|
recover |= 1;
|
|
if (high & (1<<25))
|
|
recover |= 2;
|
|
printk (KERN_EMERG "Bank %d: %08x%08x", i, high, low);
|
|
high &= ~(1<<31);
|
|
if (high & (1<<27)) {
|
|
rdmsr (MSR_IA32_MC0_MISC+i*4, alow, ahigh);
|
|
printk ("[%08x%08x]", ahigh, alow);
|
|
}
|
|
if (high & (1<<26)) {
|
|
rdmsr (MSR_IA32_MC0_ADDR+i*4, alow, ahigh);
|
|
printk (" at %08x%08x", ahigh, alow);
|
|
}
|
|
printk ("\n");
|
|
}
|
|
}
|
|
|
|
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());
|
|
}
|