linux-kernel - Re: [RFC PATCH] fpga: Introduce new fpga subsystem

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Date:	Tue, 24 Sep 2013 11:22:54 -0500
From:	Alan Tull <atull@...era.com>
To:	Michal Simek <monstr@...str.eu>
CC:	Pavel Machek <pavel@...x.de>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jason Cooper <jason@...edaemon.net>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dinh Nguyen <dinguyen@...era.com>,
	Philip Balister <philip@...ister.org>,
	Alessandro Rubini <rubini@...dd.com>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cesar Eduardo Barros <cesarb@...arb.net>,
	Joe Perches <joe@...ches.com>,
	"David S. Miller" <davem@...emloft.net>,
	Stephen Warren <swarren@...dia.com>,
	Arnd Bergmann <arnd@...db.de>,
	David Brown <davidb@...eaurora.org>,
	Dom Cobley <popcornmix@...il.com>
Subject: Re: [RFC PATCH] fpga: Introduce new fpga subsystem

On Tue, 2013-09-24 at 17:58 +0200, Michal Simek wrote:
> Hi,
> 
> On 09/24/2013 05:55 PM, Alan Tull wrote:
> > 
> >> I have ported the altera fpga manager driver to work with your version
> >> of the fpga manager framework.  It works fine if I use the
> >> firmware_class.c's built-in support to load the firmware, but not with a
> >> userspace helper.
> >>
> > 
> > 
> > Hi Michal,
> > 
> > I cleaned up my udev rules and now I see the userspace helper working.
> > Just adding one udev rule that points to the standard hotplug-script was
> > sufficient to see the userspace script working nicely.  
> > 
> > All in all, the firmware interface seems pretty easy to use and it gives
> > us the flexibility to either use the kernel to load the firmware or to
> > use scripts, so it should work with a variety of use cases.
> > 
> > Since we are arriving at a solution that is suitable for the both of us,
> > I expect you will be able to add Dinh and myself as maintainers here,
> > right?  I have no problem with there only being one repo to store
> > patches for this subsystem.
> 
> Does it mean that you are able to see "loading" file there?
> 
> Can you share your script?
> 
> Thanks,
> Michal
> 

Hi Michal,

Yes, I could see /sys/class/fpga/fpga0/image.rbf/loading and 'data' and
a few others (If I was requesting to load 'image.rbf').  It's a nice
interface.

I just used the linux/Documentation/firmware_class/hotplug-script
without modifications.

To enable it:

 * cp linux/Documentation/firmware_class/hotplug-script /lib/udev/

 * chmod 755 /lib/udev/hotplug-script

 * Add this udev rule:
   SUBSYSTEM=="firmware", ACTION=="add", RUN+="/lib/udev/hotplug-script"

 * Check that there aren't other 'firmware' udev rules to get in the
way.

 * Add your firmware files to /usr/lib/hotplug/firmware/ or change that
   path in hotplug-script to point to where your firmware files.

The default hotplug-script doesn't do anything special (that the kernel
couldn't do by itself).  What's great is that it could call another
script that adds headers or does whatever other special un-gzipping or
other massaging that the firmware image needs before it gets loaded.

Regards,
Alan


> 
> 


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