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authorSebastian Ott <sebott@linux.vnet.ibm.com>2016-09-05 17:49:17 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-09-22 13:42:33 +0200
commit1f166e9e5c7cd5d1fe2a5da7c97c1688d4c93fbb (patch)
tree0a5adec49f7b5b798c197cb3cc1dc92cb401b6fe /mm/rmap.c
parentee877b81c6b92c190e7186c1ffd054804b426c02 (diff)
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s390/pci_dma: split dma_update_trans
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>
Diffstat (limited to 'mm/rmap.c')
0 files changed, 0 insertions, 0 deletions