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authorHan, Weidong <weidong.han@intel.com>2009-04-03 17:15:47 +0800
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-04-03 21:46:01 +0100
commit161fde083f3403e7aa178dc944bf43c339e18491 (patch)
tree79473edadf7aad496c9158400ea7bb4f8336516e /drivers/pci
parentb24696bc55f66fecc30715e003f10fc2555a9271 (diff)
downloadblackbird-op-linux-161fde083f3403e7aa178dc944bf43c339e18491.tar.gz
blackbird-op-linux-161fde083f3403e7aa178dc944bf43c339e18491.zip
intel-iommu: set compatibility format interrupt
When extended interrupt mode (x2apic mode) is not supported in a system, it must set compatibility format interrupt to bypass interrupt remapping, otherwise compatibility format interrupts will be blocked. This will be used when interrupt remapping is enabled while x2apic is not supported. Signed-off-by: Weidong Han <weidong.han@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/intr_remapping.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index c26633d7e7da..ef25caade54b 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -415,12 +415,27 @@ static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
/* Set interrupt-remapping table pointer */
cmd = iommu->gcmd | DMA_GCMD_SIRTP;
+ iommu->gcmd |= DMA_GCMD_SIRTP;
writel(cmd, iommu->reg + DMAR_GCMD_REG);
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
readl, (sts & DMA_GSTS_IRTPS), sts);
spin_unlock_irqrestore(&iommu->register_lock, flags);
+ if (mode == 0) {
+ spin_lock_irqsave(&iommu->register_lock, flags);
+
+ /* enable comaptiblity format interrupt pass through */
+ cmd = iommu->gcmd | DMA_GCMD_CFI;
+ iommu->gcmd |= DMA_GCMD_CFI;
+ writel(cmd, iommu->reg + DMAR_GCMD_REG);
+
+ IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+ readl, (sts & DMA_GSTS_CFIS), sts);
+
+ spin_unlock_irqrestore(&iommu->register_lock, flags);
+ }
+
/*
* global invalidation of interrupt entry cache before enabling
* interrupt-remapping.
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