From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Alan Tull <atull@kernel.org>, Moritz Fischer <mdf@kernel.org>,
linux-fpga@vger.kernel.org, Marek Vasut <marek.vasut@gmail.com>
Subject: Re: [PATCH] fpga: add simple userspace interface to trigger FPGA programming
Date: Sun, 10 Dec 2017 23:42:11 +0100 [thread overview]
Message-ID: <20171210234211.6c704dfa@windsurf.lan> (raw)
In-Reply-To: <e730ef80-df19-3caa-68b2-02d6ef56f04e@gmail.com>
Hello,
On Sat, 9 Dec 2017 10:05:55 -0800, Florian Fainelli wrote:
> > The problem I see with this is that it's allowing userspace to switch
> > out what's on the FPGA without controlling bridges and without
> > unloading drivers first.
>
> We can actually use the Linux device driver model to do that though.
> Assuming all peripherals behind the FPGA do have the FPGA manager's
> struct device as a parent (which they should),
Well in my setup, that isn't the case. The device implemented in the
FPGA is a PCIe endpoint, so its parent device from a device model point
of view if the PCIe root complex, which is a platform_device in the SoC.
So there is currently no connection between the PCIe endpoint
implemented in the FPGA, and the FPGA device itself.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
next prev parent reply other threads:[~2017-12-10 22:42 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-04 15:43 [PATCH] fpga: add simple userspace interface to trigger FPGA programming Thomas Petazzoni
2017-12-04 15:50 ` Alan Tull
2017-12-04 15:58 ` Thomas Petazzoni
2017-12-04 16:25 ` Alan Tull
2017-12-04 16:49 ` Moritz Fischer
2017-12-04 17:30 ` Alan Tull
2017-12-09 18:05 ` Florian Fainelli
2017-12-10 4:03 ` Alan Tull
2017-12-10 22:44 ` Thomas Petazzoni
2017-12-10 22:59 ` Florian Fainelli
2017-12-11 22:05 ` Moritz Fischer
2017-12-11 23:32 ` Alan Tull
2017-12-13 6:30 ` yves.vandervennet
2017-12-13 5:23 ` Thomas Petazzoni
2017-12-13 15:59 ` Alan Tull
2017-12-14 5:27 ` Thomas Petazzoni
2017-12-14 20:10 ` Alan Tull
2017-12-10 22:42 ` Thomas Petazzoni [this message]
2018-08-11 15:01 ` Philippe De Muyter
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