linux-kernel - Re: [PATCH v3 08/21] fpga: add Intel FPGA DFL PCIe device

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Date:   Tue, 5 Dec 2017 11:33:30 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     Alan Tull <atull@...nel.org>
Cc:     David Laight <David.Laight@...lab.com>,
        "mdf@...nel.org" <mdf@...nel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "luwei.kang@...el.com" <luwei.kang@...el.com>,
        "yi.z.zhang@...el.com" <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 v3 08/21] fpga: add Intel FPGA DFL PCIe device

On Mon, Dec 04, 2017 at 01:46:59PM -0600, Alan Tull wrote:
> On Mon, Nov 27, 2017 at 9:15 PM, Wu Hao <hao.wu@...el.com> wrote:
> > On Mon, Nov 27, 2017 at 10:28:04AM +0000, David Laight wrote:
> >> From: Wu Hao
> >> > Sent: 27 November 2017 06:42
> >> > From: Zhang Yi <yi.z.zhang@...el.com>
> >> >
> >> > The Intel FPGA device appears as a PCIe device on the system. This patch
> >> > implements the basic framework of the driver for Intel PCIe device which
> >> > is located between CPU and Accelerated Function Units (AFUs), and has
> >> > the Device Feature List (DFL) implemented in its MMIO space.
> >>
> >> This ought to have a better name than 'Intel FPGA'.
> >> An fpga can be used for all sorts of things, this looks like
> >> a very specific architecture using a common VHDL environment to
> >> allow certain types of user VHDL be accessed over PCIe.
> >
> > Hi David
> >
> > This patch adds a pcie device driver for Intel FPGA devices which implements
> > the DFL, e.g Intel Server Platform with In-package FPGA and Intel FPGA PCIe
> > Acceleration Cards. They are pcie devices, and all have DFL implemented in
> > the MMIO space, so we would like to use one kernel driver to handle them.
> >
> > With this full patchset, it just provides user the interfaces to configure
> > and access the FPGA accelerators on Intel DFL based FPGA devices. For sure,
> > users can develop and build their own logics via tools provided by Intel,
> > program them to accelerators on these Intel FPGA devices, and access them
> > for their workloads.
> 
> I don't see anything Intel specific here.  This could all be named dfl-*

The maybe some device specific things, e.g Intel FPGA devices supported by this
driver always have FME DFL at the beginning on the BAR0 for PF device.

But I think this should be the right direction for better code reuse, it could
save efforts for other vendors who want to use DFL and follow the same way.

Thanks for the comments. I will rename this driver in the next version.

Hao