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intel-iommu: Only avoid flushing device IOTLB for domain ID 0 in caching mode

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In caching mode, domain ID 0 is reserved for non-present to present
mapping flush. Device IOTLB doesn't need to be flushed in this case.

Previously we were avoiding the flush for domain zero, even if the IOMMU 
wasn't in caching mode and domain zero wasn't special.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Yu Zhao 2009-06-29 11:31:45 +08:00 committed by David Woodhouse
parent a679128d30
commit bf92df30df
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/intel-iommu.c
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@ -1054,7 +1054,12 @@ static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did,
else
iommu->flush.flush_iotlb(iommu, did, addr, mask,
DMA_TLB_PSI_FLUSH);
if (did)
/*
* In caching mode, domain ID 0 is reserved for non-present to present
* mapping flush. Device IOTLB doesn't need to be flushed in this case.
*/
if (!cap_caching_mode(iommu->cap) || did)
iommu_flush_dev_iotlb(iommu->domains[did], addr, mask);
}