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>

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 5cbab7f..7f757ce 100644 (file)
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -46,6 +46,8 @@
 #define ROOT_SIZE              VTD_PAGE_SIZE
 #define CONTEXT_SIZE           VTD_PAGE_SIZE
 
+#define IS_BRIDGE_HOST_DEVICE(pdev) \
+                           ((pdev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
 #define IS_GFX_DEVICE(pdev) ((pdev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
 #define IS_ISA_DEVICE(pdev) ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA)
 #define IS_AZALIA(pdev) ((pdev)->vendor == 0x8086 && (pdev)->device == 0x3a3e)
@@ -2343,6 +2345,9 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
                return -EFAULT;
 
        for_each_pci_dev(pdev) {
+               /* Skip Host/PCI Bridge devices */
+               if (IS_BRIDGE_HOST_DEVICE(pdev))
+                       continue;
                if (iommu_should_identity_map(pdev, 1)) {
                        printk(KERN_INFO "IOMMU: %s identity mapping for device %s\n",
                               hw ? "hardware" : "software", pci_name(pdev));