Hi all, Here's the latest, and hopefully last, revision of the initial arm64 IOMMU dma_ops support.
There are a couple of dependencies still currently in -next and the intel-iommu tree[0]: "iommu: iova: Move iova cache management to the iova library" is necessary for the rename of iova_cache_get(), and "iommu/iova: Avoid over-allocating when size-aligned" will be needed with some IOMMU drivers to prevent unmapping errors. Changes from v5[1]: - Change __iommu_dma_unmap() from BUG to WARN when things go wrong, and prevent a NULL dereference on double-free. - Fix iommu_dma_map_sg() to ensure segments can never inadvertently end mapped across a segment boundary. As a result, we have to lose the segment-merging optimisation from before (I might revisit that if there's some evidence it's really worthwhile, though). - Cleaned up the platform device workarounds for config order and default domains, and removed the other hacks. Demanding that the IOMMU drivers assign groups, and support IOMMU_DOMAIN_DMA via the methods provided, keeps things bearable, and the behaviour should now be consistent across all cases. As a bonus, whilst the underlying of_iommu_configure() code only supports platform devices at the moment, I can also say that this has now been tested to work for PCI devices too, via some horrible hacks on a Juno r1. Thanks, Robin. [0]:http://thread.gmane.org/gmane.linux.kernel.iommu/11033 [1]:http://thread.gmane.org/gmane.linux.kernel.iommu/10439 Robin Murphy (3): iommu: Implement common IOMMU ops for DMA mapping arm64: Add IOMMU dma_ops arm64: Hook up IOMMU dma_ops arch/arm64/Kconfig | 1 + arch/arm64/include/asm/dma-mapping.h | 15 +- arch/arm64/mm/dma-mapping.c | 457 ++++++++++++++++++++++++++++++ drivers/iommu/Kconfig | 7 + drivers/iommu/Makefile | 1 + drivers/iommu/dma-iommu.c | 524 +++++++++++++++++++++++++++++++++++ include/linux/dma-iommu.h | 85 ++++++ include/linux/iommu.h | 1 + 8 files changed, 1083 insertions(+), 8 deletions(-) create mode 100644 drivers/iommu/dma-iommu.c create mode 100644 include/linux/dma-iommu.h -- 1.9.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
