linux-kernel - Re: [PATCH] UIO: Allow a UIO driver to override the default pgprot when we mmap

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Date:	Wed, 12 Oct 2011 18:20:54 +0200
From:	"Hans J. Koch" <hjk@...sjkoch.de>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	"Hans J. Koch" <hjk@...sjkoch.de>, gregkh@...e.de,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UIO: Allow a UIO driver to override the default pgprot
 when we mmap

On Wed, Oct 12, 2011 at 11:08:20AM -0500, Kumar Gala wrote:
> 
> On Oct 12, 2011, at 10:35 AM, Hans J. Koch wrote:
> 
> > On Wed, Oct 12, 2011 at 09:43:36AM -0500, Kumar Gala wrote:
> >> For some devices the default behavior of pgprot_noncached is not
> >> the correct flags for the address space.
> > 
> > For what devices? Can you give a real world usecase where this is needed?
> > 
> > Thanks,
> > Hans
> 
> In the Freescale Networking devices we have a coherent memory interface to our HW queuing system.  In that case we want to change the pgprot() to be cache-able instead of non-cached.

Could you please post the kernel part of that driver?

Thanks,
Hans
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