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Commit 958cef19 authored by Tharun Kumar Merugu's avatar Tharun Kumar Merugu Committed by Gerrit - the friendly Code Review server
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msm: adsprpc: skip CPU cache synchronization for non-coherent buffers 



Skip synchronization of CPU cache for fastrpc buffers registered
as non-coherent, by DMA mapping them with the appropriate attribute
as the fastrpc driver will take care of cache maintenance.

Change-Id: I1e067270345eaa320ede76fc12ec450c341ca87a
Acked-by: default avatarThyagarajan Venkatanarayanan <venkatan@qti.qualcomm.com>
Signed-off-by: default avatarTharun Kumar Merugu <mtharu@codeaurora.org>
parent 8f2d81a9

drivers/char/adsprpc.c

+2 −1
Original line number Diff line number Diff line
@@ -859,7 +859,8 @@ static int fastrpc_mmap_create(struct fastrpc_file *fl, int fd, 
		if (map->attr & FASTRPC_ATTR_NON_COHERENT ||

			(sess->smmu.coherent && map->uncached))

			map->attach->dma_map_attrs |=

				DMA_ATTR_FORCE_NON_COHERENT;

				DMA_ATTR_FORCE_NON_COHERENT |

				DMA_ATTR_SKIP_CPU_SYNC;

		else if (map->attr & FASTRPC_ATTR_COHERENT)

			map->attach->dma_map_attrs |= DMA_ATTR_FORCE_COHERENT;