Hello, This short patch series is a snapshot of my proof-of-concept integration of the generic IOMMU interface with DMA-mapping framework for ARM architecture and Samsung IOMMU driver. In this version I rebased the code onto the updated DMA-mapping framework posted a few minutes ago. Management of io address space have been moved from genalloc to pure bitmap-based allocator. I've also added support for mapping a scatterlist with dma_map_sg/dma_unmap_sg. DMA scatterlist interface turned out to be a bit tricky task. Scatterlist may describe a set of disjoint buffers that cannot be easily merged together if they don't start and end on page boundary. In such case we need to allocate more than one buffer in io address space and map respective pages. This results in a code that might be bit hard to understand in the first try. Right now the code support only 4KiB pages. The patches have been tested on Samsung Exynos4 platform and FIMC device. Samsung IOMMU driver has been provided for the reference. It is still a work-in-progress code, but because of my holidays I wanted to avoid delaying it further. Here is the link to the intial version of my ARM & DMA-mapping integration patches: http://www.spinics.net/lists/linux-mm/msg19856.html All the patches will be available on the following GIT tree: git://git.infradead.org/users/kmpark/linux-2.6-samsung dma-mapping-v3 Git web interface: http://git.infradead.org/users/kmpark/linux-2.6-samsung/shortlog/refs/heads/dma-mapping-v3 Future: 1. Add all missing operations for IOMMU mappings (map_single/page/sync_*) 2. Move sync_* operations into separate function for better code sharing between iommu and non-iommu dma-mapping code 3. Rebase onto CMA patches and solve the issue with double mapping and page attributes 4. Add support for pages larger than 4KiB. Please note that this is very early version of patches, definitely NOT intended for merging. I just wanted to make sure that the direction is right and share the code with others that might want to cooperate on dma-mapping improvements. Best regards -- Marek Szyprowski Samsung Poland R&D Center Patch summary: Andrzej Pietrasiewicz (1): ARM: Samsung: update/rewrite Samsung SYSMMU (IOMMU) driver Marek Szyprowski (1): ARM: initial proof-of-concept IOMMU mapper for DMA-mapping arch/arm/Kconfig | 7 + arch/arm/include/asm/device.h | 4 + arch/arm/include/asm/dma-iommu.h | 29 + arch/arm/mach-exynos4/Kconfig | 5 - arch/arm/mach-exynos4/Makefile | 2 +- arch/arm/mach-exynos4/clock.c | 47 +- arch/arm/mach-exynos4/dev-sysmmu.c | 609 +++++++++++------ arch/arm/mach-exynos4/include/mach/irqs.h | 34 +- arch/arm/mach-exynos4/include/mach/sysmmu.h | 46 -- arch/arm/mm/dma-mapping.c | 504 ++++++++++++++- arch/arm/mm/vmregion.h | 2 +- arch/arm/plat-s5p/Kconfig | 21 +- arch/arm/plat-s5p/include/plat/sysmmu.h | 119 ++-- arch/arm/plat-s5p/sysmmu.c | 855 ++++++++++++++++++------ arch/arm/plat-samsung/include/plat/devs.h | 1 - arch/arm/plat-samsung/include/plat/fimc-core.h | 25 + 16 files changed, 1724 insertions(+), 586 deletions(-) create mode 100644 arch/arm/include/asm/dma-iommu.h delete mode 100644 arch/arm/mach-exynos4/include/mach/sysmmu.h -- 1.7.1.569.g6f426 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>