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[IA64] hotplug/ia64: SN Hotplug Driver: SN IRQ Fixes

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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>
This commit is contained in:
Prarit Bhargava 2005-07-06 14:59:44 -07:00 • committed by Tony Luck
commit cb4cb2cb9b
4 changed files with 162 additions and 137 deletions
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6
include/asm-ia64/sn/intr.h
View file

@ -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 @@ struct sn_irq_info {
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);

4
include/asm-ia64/sn/pcidev.h
View file

@ -10,8 +10,6 @@
#include <linux/pci.h>
extern struct sn_irq_info **sn_irq;
#define SN_PCIDEV_INFO(pci_dev) \
((struct pcidev_info *)(pci_dev)->sysdata)
@ -50,9 +48,11 @@ struct pcidev_info {
struct sn_irq_info *pdi_sn_irq_info;
struct sn_pcibus_provider *pdi_provider; /* sn pci ops */
struct pci_dev *host_pci_dev; /* host bus link */
};
extern void sn_irq_fixup(struct pci_dev *pci_dev,
struct sn_irq_info *sn_irq_info);
extern void sn_irq_lh_init(void);
#endif /* _ASM_IA64_SN_PCI_PCIDEV_H */