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1f166e9e5c
Split dma_update_trans into __dma_update_trans which handles updating the dma translation tables and __dma_purge_tlb which takes care of purging associated entries in the dma translation lookaside buffer. The map_sg API makes use of this split approach by calling __dma_update_trans once per physically contiguous address range but __dma_purge_tlb only once per dma contiguous address range. This results in less invocations of the expensive RPCIT instruction when using map_sg. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
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