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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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17
drivers/pci/intr_remapping.c
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@@ -499,6 +499,23 @@ int __init enable_intr_remapping(int eim)
struct dmar_drhd_unit *drhd;
int setup = 0;
for_each_drhd_unit(drhd) {
struct intel_iommu *iommu = drhd->iommu;
/*
* Clear previous faults.
*/
dmar_fault(-1, iommu);
/*
* Disable intr remapping and queued invalidation, if already
* enabled prior to OS handover.
*/
disable_intr_remapping(iommu);
dmar_disable_qi(iommu);
}
/*
* check for the Interrupt-remapping support
*/