linux-kernel - Re: [PATCH v5 28/28] fpga: dfl: afu: add DFL_FPGA_PORT_DMA

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Date:   Wed, 6 Jun 2018 11:09:23 -0500
From:   Alan Tull <atull@...nel.org>
To:     Wu Hao <hao.wu@...el.com>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>,
        Tim Whisonant <tim.whisonant@...el.com>,
        Enno Luebbers <enno.luebbers@...el.com>,
        Shiva Rao <shiva.rao@...el.com>,
        Christopher Rauer <christopher.rauer@...el.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: Re: [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@...el.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@...el.com>
> Signed-off-by: Enno Luebbers <enno.luebbers@...el.com>
> Signed-off-by: Shiva Rao <shiva.rao@...el.com>
> Signed-off-by: Christopher Rauer <christopher.rauer@...el.com>
> Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>

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