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x86, dmar: start with sane state while enabling dma and interrupt-remapping

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Impact: cleanup/sanitization

Start from a sane state while enabling dma and interrupt-remapping, by
clearing the previous recorded faults and disabling previously
enabled queued invalidation and interrupt-remapping.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Suresh Siddha
2009-03-16 17:04:57 -07:00
committed by H. Peter Anvin
parent eba67e5da6
commit 1531a6a6b8
4 changed files with 49 additions and 4 deletions
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5
drivers/pci/dmar.c
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@@ -982,7 +982,7 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type,
}
#define PRIMARY_FAULT_REG_LEN (16)
static irqreturn_t dmar_fault(int irq, void *dev_id)
irqreturn_t dmar_fault(int irq, void *dev_id)
{
struct intel_iommu *iommu = dev_id;
int reg, fault_index;
@@ -1074,9 +1074,6 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
return 0;
}
/* Force fault register is cleared */
dmar_fault(irq, iommu);
ret = request_irq(irq, dmar_fault, 0, iommu->name, iommu);
if (ret)
printk(KERN_ERR "IOMMU: can't request irq\n");