On Wed, Jun 01, 2016 at 05:22:23PM +0200, Niklas Söderlund wrote: > Hi, > > [In this v7 series I have tried to address the questions raised by Christoph > Hellwig and I hope it can awnser your concernes regarding dma-debug.] > > This series tries to solve the problem with DMA with device registers > (MMIO registers) that are behind an IOMMU for the rcar-dmac driver. A > recent patch '9575632 (dmaengine: make slave address physical)' > clarifies that DMA slave address provided by clients is the physical > address. This puts the task of mapping the DMA slave address from a > phys_addr_t to a dma_addr_t on the DMA engine. > > Without an IOMMU this is easy since the phys_addr_t and dma_addr_t are > the same and no special care is needed. However if you have a IOMMU you > need to map the DMA slave phys_addr_t to a dma_addr_t using something > like this. > > This series is based on top of v4.7-rc1. The dmanegine bits looks okay to me. Btw how is the merge planned for this? Do you wnat this to be merged thru dmaengine tree or something else? -- ~Vinod
