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MIPS: DEC: Rate-limit memory errors for non-KN01 parity systems 

Similarly to memory errors in ECC systems also rate-limit memory parity
errors for KN02-BA, KN02-CA, KN04-BA, KN04-CA DECstation and DECsystem
models.  Unlike with ECC these events are always fatal and are less
likely to cause a message flood, but handle them the same way for
consistency.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
master
Maciej W. Rozycki 2026-03-28 15:50:05 +00:00 committed by Thomas Bogendoerfer
parent 798715fa06
commit c523378ce6
1 changed files with 16 additions and 10 deletions
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26
arch/mips/dec/kn02xa-berr.c
View File

@ -6,12 +6,13 @@
* DECstation/DECsystem 5000/20, /25, /33 (KN02-CA), 5000/50
* (KN04-CA) systems.
*
* Copyright (c) 2005 Maciej W. Rozycki
* Copyright (c) 2005, 2026 Maciej W. Rozycki
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/ratelimit.h>
#include <linux/types.h>
#include <asm/addrspace.h>
@ -50,6 +51,10 @@ static int dec_kn02xa_be_backend(struct pt_regs *regs, int is_fixup,
static const char paritystr[] = "parity error";
static const char lanestat[][4] = { " OK", "BAD" };
static DEFINE_RATELIMIT_STATE(rs,
DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
const char *kind, *agent, *cycle, *event;
unsigned long address;
@ -79,18 +84,19 @@ static int dec_kn02xa_be_backend(struct pt_regs *regs, int is_fixup,
if (is_fixup)
action = MIPS_BE_FIXUP;
if (action != MIPS_BE_FIXUP)
if (action != MIPS_BE_FIXUP && __ratelimit(&rs)) {
printk(KERN_ALERT "Bus error %s: %s %s %s at %#010lx\n",
kind, agent, cycle, event, address);
if (action != MIPS_BE_FIXUP && address < 0x10000000)
printk(KERN_ALERT " Byte lane status %#3x -- "
"#3: %s, #2: %s, #1: %s, #0: %s\n",
(mer & KN02XA_MER_BYTERR) >> 8,
lanestat[(mer & KN02XA_MER_BYTERR_3) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_2) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_1) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_0) != 0]);
if (address < 0x10000000)
printk(KERN_ALERT " Byte lane status %#3x -- "
"#3: %s, #2: %s, #1: %s, #0: %s\n",
(mer & KN02XA_MER_BYTERR) >> 8,
lanestat[(mer & KN02XA_MER_BYTERR_3) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_2) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_1) != 0],
lanestat[(mer & KN02XA_MER_BYTERR_0) != 0]);
}
return action;
}