[IA64] hotplug/ia64: SN Hotplug Driver: SN IRQ Fixes
This patch fixes the SN IRQ code such that cpu affinity and
Hotplug can modify IRQ values. The sn_irq_info structures are now locked
using a RCU lock mechanism to avoid lock contention in the lost interrupt
WAR code.
Signed-off-by: Prarit Bhargava <prarit@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/include/asm-ia64/sn/intr.h b/include/asm-ia64/sn/intr.h
index e51471f..e190dd4 100644
--- a/include/asm-ia64/sn/intr.h
+++ b/include/asm-ia64/sn/intr.h
@@ -9,6 +9,8 @@
#ifndef _ASM_IA64_SN_INTR_H
#define _ASM_IA64_SN_INTR_H
+#include <linux/rcupdate.h>
+
#define SGI_UART_VECTOR (0xe9)
#define SGI_PCIBR_ERROR (0x33)
@@ -33,7 +35,7 @@
// The SN PROM irq struct
struct sn_irq_info {
- struct sn_irq_info *irq_next; /* sharing irq list */
+ struct sn_irq_info *irq_next; /* deprecated DO NOT USE */
short irq_nasid; /* Nasid IRQ is assigned to */
int irq_slice; /* slice IRQ is assigned to */
int irq_cpuid; /* kernel logical cpuid */
@@ -47,6 +49,8 @@
int irq_cookie; /* unique cookie */
int irq_flags; /* flags */
int irq_share_cnt; /* num devices sharing IRQ */
+ struct list_head list; /* list of sn_irq_info structs */
+ struct rcu_head rcu; /* rcu callback list */
};
extern void sn_send_IPI_phys(int, long, int, int);