On Thu, Aug 23, 2018 at 07:54:21PM -0700, Andrey Smirnov wrote: > Current code for dma_sync_single_for_device(), when called with dir > set to DMA_FROM_DEVICE, will first invalidate given region of memory > as a first step and then clean+invalidate it as a second. While the > second step should be harmless it seems to be an unnecessary no-op > that could probably be avoided. > > Analogous code in Linux kernel (4.18) in arch/arm64/mm/cache.S: > > ENTRY(__dma_map_area) > cmp w2, #DMA_FROM_DEVICE > b.eq __dma_inv_area > b __dma_clean_area > ENDPIPROC(__dma_map_area) > > is written to only perform either invalidate or clean, depending on > the direction, so change dma_sync_single_for_device() to behave in the > same vein and perfom _either_ invlidate or flush of the given region. > > Signed-off-by: Andrey Smirnov <[email protected]> > ---
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