linux-kernel - Re: [RFC 7/8] fpga-region: add sysfs interface

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Date:   Wed, 22 Feb 2017 09:50:54 -0800
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     "Nadathur, Sundar" <sundar.nadathur@...el.com>,
        Alan Tull <delicious.quinoa@...il.com>,
        Yves Vandervennet <yves.vandervennet@...ux.intel.com>,
        "matthew.gerlach@...ux.intel.com" <matthew.gerlach@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "Marek Va??ut" <marex@...x.de>
Subject: Re: [RFC 7/8] fpga-region: add sysfs interface

Jason,

On Wed, Feb 22, 2017 at 8:44 AM, Jason Gunthorpe
<jgunthorpe@...idianresearch.com> wrote:
> On Tue, Feb 21, 2017 at 10:05:42PM -0800, Moritz Fischer wrote:
>
>> That being said older drivers / fpga-mgr  will not deal with newer features.
>> TLV / KV or whatever doesn't change this fact, or am I missing something?
>
> Often a scheme will have an OPTIONAL and REQUIRED flag for each
> value. If a REQUIRED value is present but the parser does not
> support it then the parse fails.

Oh, of course. I'm a dorque :) Obvioiusly better customer experience like that.

> For instance, we could mark Encrypted as required, and a zynq driver
> that does not support the Encrypted tag would not load the bitfile
> rather than try to load it wrongly.

Funny you'd mention that. Thanks to your patch the zynq driver won't ;-)
I ran into that while testing, hehe.

> This can be forced into any of the approaches with various levels of
> hackery.

Yeah doesn't seem to hard,

Cheers

Moritz