linux-kernel - Re: [PATCH] configfs: Implement binary attributes (v3)

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Date:	Wed, 29 Oct 2014 08:58:59 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Joel Becker <jlbec@...lplan.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <robherring2@...il.com>,
	Matt Porter <matt.porter@...aro.org>,
	Koen Kooi <koen@...inion.thruhere.net>,
	Alison Chaiken <Alison_Chaiken@...tor.com>,
	Dinh Nguyen <dinh.linux@...il.com>,
	Jan Lubbe <jluebbe@...net.de>,
	Alexander Sverdlin <alexander.sverdlin@....com>,
	Michael Stickel <ms@...able.de>,
	Guenter Roeck <linux@...ck-us.net>,
	Dirk Behme <dirk.behme@...il.com>,
	Alan Tull <delicious.quinoa@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Michael Bohan <mbohan@...eaurora.org>,
	Ionut Nicu <ioan.nicu.ext@....com>,
	Michal Simek <monstr@...str.eu>,
	Matt Ranostay <mranostay@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Pete Popov <pete.popov@...sulko.com>,
	Dan Malek <dan.malek@...sulko.com>,
	Georgi Vlaev <georgi.vlaev@...sulko.com>
Subject: Re: [PATCH] configfs: Implement binary attributes (v3)

Hi Greg,

> On Oct 29, 2014, at 04:54 , Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> On Tue, Oct 28, 2014 at 10:30:32PM +0200, Pantelis Antoniou wrote:
>> ConfigFS lacked binary attributes up until now. This patch
>> introduces support for binary attributes in a somewhat similar
>> manner of sysfs binary attributes albeit with changes that
>> fit the configfs usage model.
>> 
>> Problems that configfs binary attributes fix are everything that
>> requires a binary blob as part of the configuration of a resource,
>> such as bitstream loading for FPGAs, DTBs for dynamically created
>> devices etc.
> 
> What's wrong with using the firmware interface for this instead?
> 

It is problem when the bitstream is provided by user-space due to namespace
issues. What happens if you have a container, from where do you get that firmware
file so that you can use it.

IIRC Joel didn’t object too much last time I posted it.

> What driver/subsystem wants to use configfs binary files?  Having a user
> for this api is essential if you want it to be merged.
> 

Device tree overlays for starters and the FPGA manager.

For the first please look at "OF: DT-Overlay configfs interface (v2)” posted
yesterday; you are in the CC list.

> thanks,
> 
> greg k-h

Regards

— Pantelis

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