From 1f3b6045f783ee394076ad6dba2d72ecaaecd243 Mon Sep 17 00:00:00 2001
From: Russ Anderson <rja@sgi.com>
Date: Wed, 31 Oct 2007 11:10:38 -0500
Subject: [PATCH] [IA64] Disable/re-enable CPE interrupts on Altix
When the CPE handler encounters too many CPEs (such as a solid single
bit memory error), it sets up a polling timer and disables the CPE
interrupt (to avoid excessive overhead logging the stream of single
bit errors). disable_irq_nosync() calls chip->disable() to provide
a chipset specifiec interface for disabling the interrupt. This patch
adds the Altix specific support to disable and re-enable the CPE interrupt.
Signed-off-by: Russ Anderson (rja@sgi.com)
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
arch/ia64/kernel/mca.c | 2 +-
arch/ia64/sn/kernel/irq.c | 8 +++++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index cc87025e8f54..10b48cd15a87 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -571,7 +571,7 @@ ia64_mca_cpe_int_handler (int cpe_irq, void *arg)
* Outputs
* None
*/
-static void __init
+void
ia64_mca_register_cpev (int cpev)
{
/* Register the CPE interrupt vector with SAL */
diff --git a/arch/ia64/sn/kernel/irq.c b/arch/ia64/sn/kernel/irq.c
index 0f9b12683bf3..53351c3cd7b1 100644
--- a/arch/ia64/sn/kernel/irq.c
+++ b/arch/ia64/sn/kernel/irq.c
@@ -5,7 +5,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (c) 2000-2006 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <linux/irq.h>
@@ -85,12 +85,18 @@ static void sn_shutdown_irq(unsigned int irq)
{
}
+extern void ia64_mca_register_cpev(int);
+
static void sn_disable_irq(unsigned int irq)
{
+ if (irq == local_vector_to_irq(IA64_CPE_VECTOR))
+ ia64_mca_register_cpev(0);
}
static void sn_enable_irq(unsigned int irq)
{
+ if (irq == local_vector_to_irq(IA64_CPE_VECTOR))
+ ia64_mca_register_cpev(irq);
}
static void sn_ack_irq(unsigned int irq)
--
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