Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Dave Jones |
149 |
71.98% |
1 |
7.69% |
| Andrew Lutomirski |
17 |
8.21% |
2 |
15.38% |
| Ingo Molnar |
11 |
5.31% |
1 |
7.69% |
| Hidetoshi Seto |
11 |
5.31% |
2 |
15.38% |
| Andi Kleen |
8 |
3.86% |
2 |
15.38% |
| Chen Yucong |
4 |
1.93% |
1 |
7.69% |
| Borislav Petkov |
3 |
1.45% |
1 |
7.69% |
| Rusty Russell |
2 |
0.97% |
1 |
7.69% |
| Alan Cox |
1 |
0.48% |
1 |
7.69% |
| Greg Kroah-Hartman |
1 |
0.48% |
1 |
7.69% |
| Total |
207 |
|
13 |
|
// 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>
#include "internal.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);
}
/* 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());
}