Commit 817f32d0 authored by Andi Kleen's avatar Andi Kleen Committed by H. Peter Anvin

x86, mce: add table driven machine check grading

The machine check grading (as in deciding what should be done for a given
register value) has to be done multiple times soon and it's also getting
more complicated.
So it makes sense to consolidate it into a single function. To get smaller
and more straight forward and possibly more extensible code I opted towards
a new table driven method. The various rules are put into a table
when is then executed by a very simple interpreter.

The grading engine is in a new file mce-severity.c. I also added a private
include file mce-internal.h, because mce.h is already a bit too cluttered.

This is dead code right now, but will be used in followon patches.
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
Signed-off-by: default avatarHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent a0189c70
obj-y = mce.o therm_throt.o
obj-$(CONFIG_X86_NEW_MCE) += mce-severity.o
obj-$(CONFIG_X86_OLD_MCE) += k7.o p4.o p6.o
obj-$(CONFIG_X86_ANCIENT_MCE) += winchip.o p5.o
obj-$(CONFIG_X86_MCE_P4THERMAL) += mce_intel.o
......
#include <asm/mce.h>
enum severity_level {
MCE_NO_SEVERITY,
MCE_SOME_SEVERITY,
MCE_UC_SEVERITY,
MCE_PANIC_SEVERITY,
};
int mce_severity(struct mce *a, int tolerant, char **msg);
/*
* MCE grading rules.
* Copyright 2008, 2009 Intel Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2
* of the License.
*
* Author: Andi Kleen
*/
#include <linux/kernel.h>
#include <asm/mce.h>
#include "mce-internal.h"
/*
* Grade an mce by severity. In general the most severe ones are processed
* first. Since there are quite a lot of combinations test the bits in a
* table-driven way. The rules are simply processed in order, first
* match wins.
*/
static struct severity {
u64 mask;
u64 result;
unsigned char sev;
unsigned char mcgmask;
unsigned char mcgres;
char *msg;
} severities[] = {
#define SEV(s) .sev = MCE_ ## s ## _SEVERITY
#define BITCLR(x, s, m, r...) { .mask = x, .result = 0, SEV(s), .msg = m, ## r }
#define BITSET(x, s, m, r...) { .mask = x, .result = x, SEV(s), .msg = m, ## r }
#define MCGMASK(x, res, s, m, r...) \
{ .mcgmask = x, .mcgres = res, SEV(s), .msg = m, ## r }
BITCLR(MCI_STATUS_VAL, NO, "Invalid"),
BITCLR(MCI_STATUS_EN, NO, "Not enabled"),
BITSET(MCI_STATUS_PCC, PANIC, "Processor context corrupt"),
MCGMASK(MCG_STATUS_RIPV, 0, PANIC, "No restart IP"),
BITSET(MCI_STATUS_UC|MCI_STATUS_OVER, PANIC, "Overflowed uncorrected"),
BITSET(MCI_STATUS_UC, UC, "Uncorrected"),
BITSET(0, SOME, "No match") /* always matches. keep at end */
};
int mce_severity(struct mce *a, int tolerant, char **msg)
{
struct severity *s;
for (s = severities;; s++) {
if ((a->status & s->mask) != s->result)
continue;
if ((a->mcgstatus & s->mcgmask) != s->mcgres)
continue;
if (s->sev > MCE_NO_SEVERITY && (a->status & MCI_STATUS_UC) &&
tolerant < 1)
return MCE_PANIC_SEVERITY;
if (msg)
*msg = s->msg;
return s->sev;
}
}
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