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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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29
drivers/pci/intel-iommu.c
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@@ -1855,11 +1855,40 @@ static int __init init_dmars(void)
}
}
/*
* Start from the sane iommu hardware state.
*/
for_each_drhd_unit(drhd) {
if (drhd->ignored)
continue;
iommu = drhd->iommu;
/*
* If the queued invalidation is already initialized by us
* (for example, while enabling interrupt-remapping) then
* we got the things already rolling from a sane state.
*/
if (iommu->qi)
continue;
/*
* Clear any previous faults.
*/
dmar_fault(-1, iommu);
/*
* Disable queued invalidation if supported and already enabled
* before OS handover.
*/
dmar_disable_qi(iommu);
}
for_each_drhd_unit(drhd) {
if (drhd->ignored)
continue;
iommu = drhd->iommu;
if (dmar_enable_qi(iommu)) {
/*
* Queued Invalidate not enabled, use Register Based