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From: "Hans J. Koch" <hjk@hansjkoch.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, "Hans J. Koch" <hjk@hansjkoch.de>,
	gregkh@suse.de, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] UIO: Allow a UIO driver to override the default pgprot when we mmap
Date: Wed, 12 Oct 2011 18:20:54 +0200	[thread overview]
Message-ID: <20111012162053.GF21852@local> (raw)
In-Reply-To: <AEAF26D0-640A-4DD2-82FE-B3BD02662EEC@kernel.crashing.org>

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

WARNING: multiple messages have this Message-ID (diff)
From: "Hans J. Koch" <hjk@hansjkoch.de>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: "Hans J. Koch" <hjk@hansjkoch.de>,
	gregkh@suse.de, linuxppc-dev@ozlabs.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] UIO: Allow a UIO driver to override the default pgprot when we mmap
Date: Wed, 12 Oct 2011 18:20:54 +0200	[thread overview]
Message-ID: <20111012162053.GF21852@local> (raw)
In-Reply-To: <AEAF26D0-640A-4DD2-82FE-B3BD02662EEC@kernel.crashing.org>

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

  reply	other threads:[~2011-10-12 16:21 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-12 14:43 [PATCH] UIO: Allow a UIO driver to override the default pgprot when we mmap Kumar Gala
2011-10-12 14:43 ` Kumar Gala
2011-10-12 15:35 ` Hans J. Koch
2011-10-12 15:35   ` Hans J. Koch
2011-10-12 16:08   ` Kumar Gala
2011-10-12 16:08     ` Kumar Gala
2011-10-12 16:20     ` Hans J. Koch [this message]
2011-10-12 16:20       ` Hans J. Koch

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