intel-iommu: Remove Host Bridge devices from identity mapping
When using the 1:1 (identity) PCI DMA remapping, PCI Host Bridge devices that do not use the IOMMU causes a kernel panic. Fix that by not inserting those devices into the si_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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@ -46,6 +46,8 @@
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#define ROOT_SIZE VTD_PAGE_SIZE
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#define CONTEXT_SIZE VTD_PAGE_SIZE
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#define IS_BRIDGE_HOST_DEVICE(pdev) \
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((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
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#define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
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#define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
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#define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
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@ -2343,6 +2345,9 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
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return -EFAULT;
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for_each_pci_dev(pdev) {
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/* Skip Host/PCI Bridge devices */
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if (IS_BRIDGE_HOST_DEVICE(pdev))
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continue;
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if (iommu_should_identity_map(pdev, 1)) {
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printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n",
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hw ? "hardware" : "software", pci_name(pdev));
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