Hello,
This is another update on my attempt on DMA-mapping framework redesign for ARM architecture. It includes a few minor changes since last version. We have focused mainly on IOMMU mapper, keeping the DMA-mapping redesign patches almost unchanged.
All patches have been now rebased onto v3.2-rc4 kernel + IOMMU/next branch to include latest changes from IOMMU kernel tree.
This series also contains support for mapping with pages larger than 4KiB using new, extended IOMMU API. This code has been provided by Andrzej Pietrasiewicz.
All the code has been tested on Samsung Exynos4 'UniversalC210' board with IOMMU driver posted by KyongHo Cho.
GIT tree will all the patches (including some Samsung Exynos4 stuff): http://git.infradead.org/users/kmpark/linux-samsung/shortlog/refs/heads/3.2-... git://git.infradead.org/users/kmpark/linux-samsung 3.2-rc4-dma-v5-samsung
History:
Initial version of the DMA-mapping redesign patches: http://www.spinics.net/lists/linux-mm/msg21241.html
Second version of the patches: http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000571.html http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000577.html
Third version of the patches: http://www.spinics.net/lists/linux-mm/msg25490.html
TODO: - start the discussion about chaning alloc_coherent into alloc_attrs in dma_map_ops structure. - start the discussion about dma_mmap function - provide documentation for the new dma attributes
Best regards -- Marek Szyprowski Samsung Poland R&D Center
Patch summary:
Marek Szyprowski (8): ARM: dma-mapping: remove offset parameter to prepare for generic dma_ops ARM: dma-mapping: use asm-generic/dma-mapping-common.h ARM: dma-mapping: implement dma sg methods on top of any generic dma ops ARM: dma-mapping: move all dma bounce code to separate dma ops structure ARM: dma-mapping: remove redundant code and cleanup common: dma-mapping: change alloc/free_coherent method to more generic alloc/free_attrs ARM: dma-mapping: use alloc, mmap, free from dma_ops ARM: initial proof-of-concept IOMMU mapper for DMA-mapping
arch/arm/Kconfig | 9 + arch/arm/common/dmabounce.c | 78 +++- arch/arm/include/asm/device.h | 4 + arch/arm/include/asm/dma-iommu.h | 36 ++ arch/arm/include/asm/dma-mapping.h | 404 +++++------------ arch/arm/mm/dma-mapping.c | 899 ++++++++++++++++++++++++++++++------ arch/arm/mm/vmregion.h | 2 +- include/linux/dma-attrs.h | 1 + include/linux/dma-mapping.h | 13 +- 9 files changed, 994 insertions(+), 452 deletions(-) create mode 100644 arch/arm/include/asm/dma-iommu.h