On Tue, May 1, 2018 at 9:50 PM, Wu Hao <[email protected]> wrote: Hi Hao,
> DMA memory regions are required for Accelerated Function Unit (AFU) usage. > These two ioctls allow user space applications to map user memory regions > for dma, and unmap them after use. Iova is returned from driver to user > space application via DFL_FPGA_PORT_DMA_MAP ioctl. Application needs to unmap > it after use, otherwise, driver will unmap them in device file release > operation. > > Each AFU has its own rb tree to keep track of its mapped DMA regions. > > Ioctl interfaces: > * DFL_FPGA_PORT_DMA_MAP > Do the dma mapping per user_addr and length which provided by user. > Return iova in provided struct dfl_fpga_port_dma_map. > > * DFL_FPGA_PORT_DMA_UNMAP > Unmap the dma region per iova provided by user. > > Signed-off-by: Tim Whisonant <[email protected]> > Signed-off-by: Enno Luebbers <[email protected]> > Signed-off-by: Shiva Rao <[email protected]> > Signed-off-by: Christopher Rauer <[email protected]> > Signed-off-by: Xiao Guangrong <[email protected]> > Signed-off-by: Wu Hao <[email protected]> Acked-by: Alan Tull <[email protected]>
