intel-iommu: Speed up processing of the identity_mapping function
When there are a large count of PCI devices, and the pass through option for iommu is set, much time is spent in the identity_mapping function hunting though the iommu domains to check if a specific device is "identity mapped". Speed up the function by checking the cached info to see if it's mapped to the static identity domain. Signed-off-by: Mike Travis <travis@sgi.com> Reviewed-by: Mike Habeck <habeck@sgi.com> Cc: stable@kernel.org Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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@ -2235,10 +2235,10 @@ static int identity_mapping(struct pci_dev *pdev)
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if (likely(!iommu_identity_mapping))
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if (likely(!iommu_identity_mapping))
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return 0;
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return 0;
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info = pdev->dev.archdata.iommu;
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if (info && info != DUMMY_DEVICE_DOMAIN_INFO)
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return (info->domain == si_domain);
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list_for_each_entry(info, &si_domain->devices, link)
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if (info->dev == pdev)
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return 1;
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return 0;
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return 0;
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}
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}
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