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
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