Hi all, Here's the cleaned-up and nominally ready-to-go IOMMU DMA mapping series, with (I think) all the outstanding comments[1] addressed. I appreciate I've probably missed the boat for 4.2, but I'm ever the optimist...
Major changes since RFC: - Renamed things, shuffled things around, and removed some of the less useful abstraction for simplicity and clarity. - Fixed iommu_dma_alloc to handle compound pages and map buffers as scatterlists. - Filled the API holes like size-aligned allocations and get_sgtable. - Solved the problem of attching devices to domains before the devices are created, which confuses IOMMU drivers like the ARM SMMU. A branch is available at: git://linux-arm.org/linux-rm iommu/dma In terms of where we go from here, this is more or less what I envisage: - Get the current functionality merged to unblock arm64 IOMMU work - Implement proper managed IOMMU domains around this, integrating the iova_domain into the iommu_domain itself, and getting rid of the iommu_dma_domain wrapper. - Find all of the ad-hoc "managed domain" implementations in drivers currently using the arm_iommu_* functions and convert them to "proper" managed domains. - Finally, with the external users taken care of, bring arch/arm over to the common DMA mapping code. In the meantime, Laurent's proposal for probe deferral[2] offers hope that the bus notifier dance may only need to be short-lived, and I'm hoping to spend some more time on DT-based IOMMU group handling for platform devices, which should hopefully tie in with default domains to make the add_device callback mostly redundant. [1]:http://thread.gmane.org/gmane.linux.kernel.iommu/8773 [2]:http://thread.gmane.org/gmane.linux.kernel.iommu/9552 Robin Murphy (4): iommu/iova: Avoid over-allocating when size-aligned 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/device.h | 3 + arch/arm64/include/asm/dma-mapping.h | 25 +- arch/arm64/mm/dma-mapping.c | 357 ++++++++++++++++++++++ drivers/iommu/Kconfig | 7 + drivers/iommu/Makefile | 1 + drivers/iommu/dma-iommu.c | 560 +++++++++++++++++++++++++++++++++++ drivers/iommu/intel-iommu.c | 2 + drivers/iommu/iova.c | 23 +- include/linux/dma-iommu.h | 94 ++++++ 10 files changed, 1051 insertions(+), 22 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
