On Wed, Aug 10, 2016 at 11:07:10PM +0530, Vinod Koul wrote: > On Wed, Aug 10, 2016 at 01:22:13PM +0200, Niklas Söderlund wrote: > > Hi, > > > > 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 v4.8-rc1. And I'm hoping to be able to collect a > > Ack from Russell King on patch 4/6 that adds the ARM specific part and then be > > able to take the whole series through the dmaengine tree. If this is not the > > best route I'm more then happy to do it another way. > > > > It's tested on a Koelsch with CONFIG_IPMMU_VMSA and by enabling the > > ipmmu_ds node in r8a7791.dtsi. I verified operation by interacting with > > /dev/mmcblk1, i2c and the serial console which are devices behind the > > iommu. > > As I said in last one, the dmaengine parts look fine to me. But to go thru > dmaengine tree I would need ACK on non dmaengine patches. I havent heard back from this one and I am inclined to merge this one now. If anyone has any objects, please speak up now... Also ACKs welcome... -- ~Vinod
