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