luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

[IA64] SN: prevent IRQ retargetting in request_irq()

Browse Source 
With the introduction of the generic affinity autoselector,
irq_select_affinity(), IRQs are now being retargetted,
using a default mask, via the request_irq() path.
This results in all IRQs targetted at CPU 0.

SN Altix assigns affinity in the SN PROM, and does not
expect that to be changed as part of request_irq().

Set the IRQ_AFFINITY_SET flag to prevent
request_irq() from resetting affinity.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
John Keller 2008-12-08 11:44:11 -06:00 committed by Tony Luck
parent 3c0db899bf
commit ff740fb021
1 changed files with 8 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
arch/ia64/sn/kernel/irq.c
View File

@ -5,7 +5,7 @@
* License. See the file "COPYING" in the main directory of this archive * License. See the file "COPYING" in the main directory of this archive
* for more details. * for more details.
* *
* Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved. * Copyright (c) 2000-2008 Silicon Graphics, Inc. All Rights Reserved.
*/ */
#include <linux/irq.h> #include <linux/irq.h>
@ -375,6 +375,7 @@ void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
int cpu = nasid_slice_to_cpuid(nasid, slice); int cpu = nasid_slice_to_cpuid(nasid, slice);
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
int cpuphys; int cpuphys;
irq_desc_t *desc;
#endif #endif
pci_dev_get(pci_dev); pci_dev_get(pci_dev);
@ -391,6 +392,12 @@ void sn_irq_fixup(struct pci_dev *pci_dev, struct sn_irq_info *sn_irq_info)
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
cpuphys = cpu_physical_id(cpu); cpuphys = cpu_physical_id(cpu);
set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0); set_irq_affinity_info(sn_irq_info->irq_irq, cpuphys, 0);
desc = irq_to_desc(sn_irq_info->irq_irq);
/*
* Affinity was set by the PROM, prevent it from
* being reset by the request_irq() path.
*/
desc->status |= IRQ_AFFINITY_SET;
#endif #endif
} }