Hello,
This is yet another update on my works DMA-mapping framework redesign for ARM architecture. It includes a few minor cleanup and fixes reported by Konrad Rzeszutek Wilk and Krishna Reddy.
This version uses vmalloc for allocating page pointers array if it is larger than PAGE_SIZE. The chained allocation which fits inside a set of PAGE_SIZE units will be added later, once the base patches are merged.
Like the previous version, this patchset is also based on the generic, cross-arch dma-mapping redesign patches posted in the "[PATCH 00/14] DMA-mapping framework redesign preparation" thread: http://www.spinics.net/lists/linux-sh/msg09777.html
All patches have been now rebased onto v3.3-rc5 kernel.
All the code has been tested on Samsung Exynos4 'UniversalC210' board with IOMMU driver posted by KyongHo Cho.
History of the development:
v1: (initial version of the DMA-mapping redesign patches): http://www.spinics.net/lists/linux-mm/msg21241.html
v2: http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000571.html http://lists.linaro.org/pipermail/linaro-mm-sig/2011-September/000577.html
v3: http://www.spinics.net/lists/linux-mm/msg25490.html
v4 and v5: http://www.spinics.net/lists/arm-kernel/msg151147.html http://www.spinics.net/lists/arm-kernel/msg154889.html
v6: http://www.spinics.net/lists/linux-mm/msg29903.html
Best regards -- Marek Szyprowski Samsung Poland R&D Center
Patch summary:
Marek Szyprowski (9): ARM: dma-mapping: introduce ARM_DMA_ERROR constant ARM: dma-mapping: use pr_* instread of printk 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 ARM: dma-mapping: use alloc, mmap, free from dma_ops ARM: dma-mapping: add support for IOMMU mapper
arch/arm/Kconfig | 9 + arch/arm/common/dmabounce.c | 84 +++- arch/arm/include/asm/device.h | 4 + arch/arm/include/asm/dma-iommu.h | 34 ++ arch/arm/include/asm/dma-mapping.h | 407 ++++----------- arch/arm/mm/dma-mapping.c | 1013 ++++++++++++++++++++++++++++++------ arch/arm/mm/vmregion.h | 2 +- 7 files changed, 1088 insertions(+), 465 deletions(-) create mode 100644 arch/arm/include/asm/dma-iommu.h