Release 4.14 arch/x86/kernel/cpu/mcheck/p5.c
// SPDX-License-Identifier: GPL-2.0
/*
* P5 specific Machine Check Exception Reporting
* (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
*/
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/smp.h>
#include <asm/processor.h>
#include <asm/traps.h>
#include <asm/tlbflush.h>
#include <asm/mce.h>
#include <asm/msr.h>
/* By default disabled */
int mce_p5_enabled __read_mostly;
/* Machine check handler for Pentium class Intel CPUs: */
static void pentium_machine_check(struct pt_regs *regs, long error_code)
{
u32 loaddr, hi, lotype;
ist_enter(regs);
rdmsr(MSR_IA32_P5_MC_ADDR, loaddr, hi);
rdmsr(MSR_IA32_P5_MC_TYPE, lotype, hi);
pr_emerg("CPU#%d: Machine Check Exception: 0x%8X (type 0x%8X).\n",
smp_processor_id(), loaddr, lotype);
if (lotype & (1<<5)) {
pr_emerg("CPU#%d: Possible thermal failure (CPU on fire ?).\n",
smp_processor_id());
}
add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
ist_exit(regs);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Jones | 67 | 76.14% | 1 | 16.67% |
| Andrew Lutomirski | 10 | 11.36% | 1 | 16.67% |
| Andi Kleen | 5 | 5.68% | 1 | 16.67% |
| Rusty Russell | 2 | 2.27% | 1 | 16.67% |
| Ingo Molnar | 2 | 2.27% | 1 | 16.67% |
| Chen Yucong | 2 | 2.27% | 1 | 16.67% |
| Total | 88 | 100.00% | 6 | 100.00% |
/* Set up machine check reporting for processors with Intel style MCE: */
void intel_p5_mcheck_init(struct cpuinfo_x86 *c)
{
u32 l, h;
/* Default P5 to off as its often misconnected: */
if (!mce_p5_enabled)
return;
/* Check for MCE support: */
if (!cpu_has(c, X86_FEATURE_MCE))
return;
machine_check_vector = pentium_machine_check;
/* Make sure the vector pointer is visible before we enable MCEs: */
wmb();
/* Read registers before enabling: */
rdmsr(MSR_IA32_P5_MC_ADDR, l, h);
rdmsr(MSR_IA32_P5_MC_TYPE, l, h);
pr_info("Intel old style machine check architecture supported.\n");
/* Enable MCE: */
cr4_set_bits(X86_CR4_MCE);
pr_info("Intel old style machine check reporting enabled on CPU#%d.\n",
smp_processor_id());
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Jones | 66 | 82.50% | 1 | 20.00% |
| Hidetoshi Seto | 7 | 8.75% | 1 | 20.00% |
| Ingo Molnar | 4 | 5.00% | 1 | 20.00% |
| Chen Yucong | 2 | 2.50% | 1 | 20.00% |
| Andrew Lutomirski | 1 | 1.25% | 1 | 20.00% |
| Total | 80 | 100.00% | 5 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Dave Jones | 149 | 73.04% | 1 | 8.33% |
| Andrew Lutomirski | 17 | 8.33% | 2 | 16.67% |
| Hidetoshi Seto | 11 | 5.39% | 2 | 16.67% |
| Ingo Molnar | 11 | 5.39% | 1 | 8.33% |
| Andi Kleen | 8 | 3.92% | 2 | 16.67% |
| Chen Yucong | 4 | 1.96% | 1 | 8.33% |
| Rusty Russell | 2 | 0.98% | 1 | 8.33% |
| Alan Cox | 1 | 0.49% | 1 | 8.33% |
| Greg Kroah-Hartman | 1 | 0.49% | 1 | 8.33% |
| Total | 204 | 100.00% | 12 | 100.00% |
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