For MTK platforms, mtk_iommu is using iotlb_sync(), tlb_add_range() and tlb_flush_walk/leaf() to do tlb sync when iommu driver runs iova mapping/unmapping. But if buffer size is large, it maybe consist of many pages(4K/8K/64K/1MB......). So iommu driver maybe run many times tlb sync in mapping for this case and it will degrade performance seriously. In order to resolve the issue, we hope to add iotlb_sync_range() callback in iommu_ops, it can appiont iova and size to do tlb sync. MTK_IOMMU will use iotlb_sync_range() callback when the whole mapping/unmapping is completed and remove iotlb_sync(), tlb_add_range() and tlb_flush_walk/leaf(). So this patchset will replace iotlb_sync(), tlb_add_range() and tlb_flush_walk/leaf() with iotlb_sync_range() callback.
Chao Hao (4): iommu: Introduce iotlb_sync_range callback iommu/mediatek: Add iotlb_sync_range() support iommu/mediatek: Remove unnecessary tlb sync iommu/mediatek: Adjust iotlb_sync_range drivers/iommu/dma-iommu.c | 9 +++++++++ drivers/iommu/iommu.c | 7 +++++++ drivers/iommu/mtk_iommu.c | 36 ++++++++---------------------------- include/linux/iommu.h | 2 ++ 4 files changed, 26 insertions(+), 28 deletions(-) -- 2.18.0 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu