Some devices are reqired to use a specific type (identity or dma) of default domain when they are used with a vendor iommu. When the system level default domain type is different from it, the vendor iommu driver has to request a new default domain with either iommu_request_dma_domain_for_dev() or iommu_request_dm_for_dev() in the add_dev() callback. Unfortunately, these two helpers only work when the group hasn't been assigned to any other devices, hence, some vendor iommu driver has to use a private domain if it fails to request a new default one.
This patch series aims to remove the private domain requirement in vendor iommu driver with enabling the iommu generic code to support configuring per-group default domain. It introduces a new callback in iommu_ops, named dev_def_domain_type(), so that the iommu generic code could check whether a device is required to use any specific type of default domain during the process of device probing. If unlikely a device requires a special default domain type other than that in use, iommu probe procedure will either allocate a new domain according to the specified domain type, or (if the group has other devices sitting in it) change the default domain. The vendor iommu driver which exposes the dev_def_domain_type callback should guarantee that there're no multiple devices belonging to a same group require differnt types of default domain. Please help to review. Best regards, baolu Lu Baolu (5): iommu: Configure default domain with dev_def_domain_type iommu/vt-d: Don't force 32bit devices to uses DMA domain iommu/vt-d: Don't force PCI sub-hierarchy to use DMA domain iommu/vt-d: Add dev_def_domain_type callback iommu/vt-d: Apply per-device dma_ops Sai Praneeth Prakhya (1): iommu: Add dev_def_domain_type() callback in iommu_ops drivers/iommu/intel-iommu.c | 453 +++--------------------------------- drivers/iommu/iommu.c | 93 +++++++- include/linux/iommu.h | 6 + 3 files changed, 126 insertions(+), 426 deletions(-) -- 2.17.1 _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
