Le Tue, Jul 05, 2022 at 07:58:34PM +0200, Christoph Hellwig a écrit : > On Tue, Jul 05, 2022 at 07:56:11PM +0200, LABBE Corentin wrote: > > My problem is that a dma_sync on the data buffer corrupt the poison buffer as collateral dommage. > > Probably because the sync operate on a larger region than the requested dma_sync length. > > So I try to flush poison data in the cryptoAPI. > > Data structures that are DMAed to must be aligned to > the value returned by dma_get_cache_alignment(), as non-coherent DMA > by definition can disturb the data inside that boundary. That is not > a bug but fundamentally part of how DMA works when the device attachment > is not cache coherent. I am sorry but I dont see how this can help my problem.
