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Re: cacheflush system call-MIPS

To: Ralf Baechle <ralf@linux-mips.org>
Subject: Re: cacheflush system call-MIPS
From: peter fuerst <post@pfrst.de>
Date: Sun, 15 Feb 2009 03:20:04 +0100 (CET)
Cc: linux-mips@linux-mips.org
In-reply-to: <20090213235603.GA32274@linux-mips.org>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <f5a7b3810902100716t2658ce95t2dcc7f85634522@mail.gmail.com> <20090211131649.GA1365@linux-mips.org> <Pine.LNX.4.58.0902140002180.408@Indigo2.Peter> <20090213235603.GA32274@linux-mips.org>
Reply-to: post@pfrst.de
Sender: linux-mips-bounce@linux-mips.org
> Why does it need that flush?

To prepare the update-area (in the Shadow-FB) for DMA to RE.


kind regards



On Fri, 13 Feb 2009, Ralf Baechle wrote:

> Date: Fri, 13 Feb 2009 23:56:03 +0000
> From: Ralf Baechle <ralf@linux-mips.org>
> To: peter fuerst <post@pfrst.de>
> Cc: naresh kamboju <naresh.kernel@gmail.com>, linux-mips@linux-mips.org
> Subject: Re: cacheflush system call-MIPS
>
> On Sat, Feb 14, 2009 at 12:50:46AM +0100, peter fuerst wrote:
>
> > there is one more good reason to ... : the Impact Xserver needs to do
> > a cacheflush(a,w,DCACHE) as part of the refresh-sequence.
> > And hence requires a sys_cacheflush, let's say, more conforming to the
> > man-page (or some disgusting new ioctl in the Impact kernel-driver to
> > do an equivalent operation ;-)
>
> Why does it need that flush?
>
>   Ralf
>
>

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