diff options
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 25 |
1 files changed, 0 insertions, 25 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 16ba7add0f72..af309e8fa6f5 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2857,31 +2857,6 @@ static int device_def_domain_type(struct device *dev) if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev)) return IOMMU_DOMAIN_IDENTITY; - - /* - * We want to start off with all devices in the 1:1 domain, and - * take them out later if we find they can't access all of memory. - * - * However, we can't do this for PCI devices behind bridges, - * because all PCI devices behind the same bridge will end up - * with the same source-id on their transactions. - * - * Practically speaking, we can't change things around for these - * devices at run-time, because we can't be sure there'll be no - * DMA transactions in flight for any of their siblings. - * - * So PCI devices (unless they're on the root bus) as well as - * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of - * the 1:1 domain, just in _case_ one of their siblings turns out - * not to be able to map all of memory. - */ - if (!pci_is_pcie(pdev)) { - if (!pci_is_root_bus(pdev->bus)) - return IOMMU_DOMAIN_DMA; - if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI) - return IOMMU_DOMAIN_DMA; - } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE) - return IOMMU_DOMAIN_DMA; } return 0; |