This patchset is a rebase of original patches from Marek Szyprowski: https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg2321261.html
The patches have been rebased on Joro's IOMMU tree "next" branch: https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git This patchset is needed to address the IOVA address dependency issue between firmware buffers and other buffers in Samsung s5p-mfc driver. There have been few discussions in the past on how to find a generic soultion for this issue, ranging from adding an entirely new API to choose IOVA window[1], to adding a DMA attribute DMA_ATTR_LOW_ADDRESS which handles buffer allocation from lower address[2]. This is a continuation of initial work from Marek for approach [2]. Patches have been tested with latest version of Samsung s5p-mfc driver. Changes since V1: [PATCH V2 1/6] - Rebase on latest tree. [PATCH V2 2/6] - Rebase on latest tree. Added a missing check for iova_pfn in __iova_rcache_get() Discard changes from drivers/iommu/intel/iommu.c which are not necessary [PATCH V2 3/6] - Rebase on latest tree. [PATCH V2 4/6] - Rebase on latest tree [PATCH V2 5/6] - Rebase on latest tree [PATCH V2 6/6] - Rebase on latest tree. Marek Szyprowski (6): dma-mapping: add DMA_ATTR_LOW_ADDRESS attribute iommu: iova: properly handle 0 as a valid IOVA address iommu: iova: add support for 'first-fit' algorithm iommu: dma-iommu: refactor iommu_dma_alloc_iova() iommu: dma-iommu: add support for DMA_ATTR_LOW_ADDRESS media: platform: s5p-mfc: use DMA_ATTR_LOW_ADDRESS References: [1] https://lore.kernel.org/linux-iommu/20200811054912.ga...@infradead.org/ [2] https://lore.kernel.org/linux-mm/bff57cbe-2247-05e1-9059-d9c66d64c...@arm.com drivers/iommu/dma-iommu.c | 77 +++++++++++----- drivers/iommu/iova.c | 91 ++++++++++++++++++- .../media/platform/samsung/s5p-mfc/s5p_mfc.c | 8 +- include/linux/dma-mapping.h | 6 ++ include/linux/iova.h | 3 + 5 files changed, 156 insertions(+), 29 deletions(-) base-commit: faf93cfaadfaaff2a5c35d6301b45aa2f6e4ddb2 -- 2.17.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
