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
prev parent reply other threads:[~2011-10-12 16:21 UTC|newest]
Thread overview: 4+ 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 15:35 ` Hans J. Koch
2011-10-12 16:08 ` Kumar Gala
2011-10-12 16:20 ` Hans J. Koch [this message]
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