Christoph,
On Mon, 2019-04-08 at 12:55 +0200, Christoph Hellwig wrote: > Hi Linus, > > unfortunately it took less than a merge window for the: > > /* > * All the dma_direct_* declarations are here just for the indirect > call bypass, > * and must not be used directly drivers! > */ > > warning in dma-mapping.h to be ignored. This series reverts the > offender > to keep our API clean. > > Thomas: please talk me first about your needs and I'll be happy to > figure out > a proper API for what you want to do. We HAVE discussed our needs, although admittedly some of my emails ended up unanswered. We've as you're well aware of had a discussion with the other subsystems doing user-space DMA-buffers wanting this functionality from the dma api (AMD graphics and RDMA people IIRC). that is a bool that tells us whether streaming dma mappings are coherent, and I described in detail why we couldn't use the dma_sync_* API and dma_alloc_coherent(). The other option we have is to just fail miserably without messages if streaming DMA is not coherent, which I think the other drivers might do... That's all I'm trying to avoid here. I'd much prefer to have the dma API export this bool. /Thomas _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
