linux-kernel - Re: [PATCH 05/17] fpga: dfl: fme: add DFL_FPGA_FME_PORT

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Date:   Thu, 28 Mar 2019 17:03:39 -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, Zhang Yi Z <yi.z.zhang@...el.com>,
        Xu Yilun <yilun.xu@...el.com>
Subject: Re: [PATCH 05/17] fpga: dfl: fme: add DFL_FPGA_FME_PORT_RELEASE/ASSIGN
 ioctl support.

On Sun, Mar 24, 2019 at 10:23 PM Wu Hao <hao.wu@...el.com> wrote:
>
> In order to support virtualization usage via PCIe SRIOV, this patch
> adds two ioctls under FPGA Management Engine (FME) to release and
> assign back the port device. In order to safely turn Port from PF
> into VF and enable PCIe SRIOV, it requires user to invoke this
> PORT_RELEASE ioctl to release port firstly to remove userspace
> interfaces, and then configure the PF/VF access register in FME.
> After disable SRIOV, it requires user to invoke this PORT_ASSIGN
> ioctl to attach the port back to PF.
>
>  Ioctl interfaces:
>  * DFL_FPGA_FME_PORT_RELEASE
>    Release platform device of given port, it deletes port platform
>    device to remove related userspace interfaces on PF, then
>    configures PF/VF access mode to VF.
>
>  * DFL_FPGA_FME_PORT_ASSIGN
>    Assign platform device of given port back to PF, it configures
>    PF/VF access mode to PF, then adds port platform device back to
>    re-enable related userspace interfaces on PF.
>
> Signed-off-by: Zhang Yi Z <yi.z.zhang@...el.com>
> Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> Signed-off-by: Wu Hao <hao.wu@...el.com>

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