[PATCHv3 0/7] dma mapping optimisations

[Keith Busch]

On Tue, Aug 09, 2022 at 08:46:13AM +0200, Christoph Hellwig wrote:
>  - the design seems to ignore DMA ownership.  Every time data in
>    transfered data needs to be transferred to and from the device,
>    take a look at Documentation/core-api/dma-api.rst and
>    Documentation/core-api/dma-api-howto.rst.

I have this doing appropriate dma_sync_single_for_{device,cpu} if we aren't
using coherent memory. Is there more to ownership beyond that?