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    SubjectRe: [PATCH v5 28/28] fpga: dfl: afu: add DFL_FPGA_PORT_DMA_MAP/UNMAP ioctls support
    On Tue, May 1, 2018 at 9:50 PM, Wu Hao <hao.wu@intel.com> 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 <tim.whisonant@intel.com>
    > Signed-off-by: Enno Luebbers <enno.luebbers@intel.com>
    > Signed-off-by: Shiva Rao <shiva.rao@intel.com>
    > Signed-off-by: Christopher Rauer <christopher.rauer@intel.com>
    > Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
    > Signed-off-by: Wu Hao <hao.wu@intel.com>

    Acked-by: Alan Tull <atull@kernel.org>

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