Date: Thu, 20 Dec 2007 16:40:00 -0800 (PST)
Message-Id: <20071220.164000.210277365.davem@davemloft.net>
To: rusty@rustcorp.com.au
Cc: 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: David Miller <davem@davemloft.net>
In-Reply-To: <200712211135.13150.rusty@rustcorp.com.au>
References: <200712210958.56994.rusty@rustcorp.com.au>
	<20071221090027K.fujita.tomonori@lab.ntt.co.jp>
	<200712211135.13150.rusty@rustcorp.com.au>
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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.

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.
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