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authorAshish Mhetre <amhetre@nvidia.com>2024-08-06 10:51:35 +0000
committerJoerg Roedel <jroedel@suse.de>2024-08-30 14:29:32 +0200
commit84b2baf427968c1b2e3ae3b7afcb0118cdee0915 (patch)
treee85ebaec3fbbd28f607faa07aaffbb2ab69c12f7 /fs
parent6c17c7d5936e6af6a5bda9f9de98a5e2ee6e8a6f (diff)
iommu/io-pgtable-arm: Optimise non-coherent unmap
The current __arm_lpae_unmap() function calls dma_sync() on individual PTEs after clearing them. Overall unmap performance can be improved by around 25% for large buffer sizes by combining the syncs for adjacent leaf entries. Optimize the unmap time by clearing all the leaf entries and issuing a single dma_sync() for them. Below is detailed analysis of average unmap latency(in us) with and without this optimization obtained by running dma_map_benchmark for different buffer sizes. UnMap Latency(us) Size Without With % gain with optimiztion optimization optimization 4KB 3 3 0 8KB 4 3.8 5 16KB 6.1 5.4 11.48 32KB 10.2 8.5 16.67 64KB 18.5 14.9 19.46 128KB 35 27.5 21.43 256KB 67.5 52.2 22.67 512KB 127.9 97.2 24.00 1MB 248.6 187.4 24.62 2MB 65.5 65.5 0 4MB 119.2 119 0.17 Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Ashish Mhetre <amhetre@nvidia.com> Acked-by: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20240806105135.218089-1-amhetre@nvidia.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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