To: davem@davemloft.net
Cc: rusty@rustcorp.com.au, fujita.tomonori@lab.ntt.co.jp,
       linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org,
       jens.axboe@oracle.com
Subject: Re: [PATCH 2/5] dma_map_sg_ring() helper
From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
In-Reply-To: <20071220.164000.210277365.davem@davemloft.net>
References: <20071221090027K.fujita.tomonori@lab.ntt.co.jp>
	<200712211135.13150.rusty@rustcorp.com.au>
	<20071220.164000.210277365.davem@davemloft.net>
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Message-Id: <20071221112256X.fujita.tomonori@lab.ntt.co.jp>
Date: Fri, 21 Dec 2007 11:22:56 +0900
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On Thu, 20 Dec 2007 16:40:00 -0800 (PST)
David Miller <davem@davemloft.net> wrote:

> From: Rusty Russell <rusty@rustcorp.com.au>
> Date: Fri, 21 Dec 2007 11:35:12 +1100
> 
> > On Friday 21 December 2007 11:00:27 FUJITA Tomonori wrote:
> > > We need to pass the whole sg entries to the IOMMUs at a time.
> > 
> > Hi Fujita,
> > 
> >     OK, it's certainly possible to have an arch override.  For which 
> > architecture is this BTW?
> 
> SPARC64, POWERPC, maybe IA-64 etc.

And x86_64, Alpha, and PARISC.


> Basically any platform that potentially does virtual
> remamping and thus linearization.
> 
> I think it should always be provided, the new APIs give
> less information to the implementation and that's a step
> backwards.

Agreed.
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