linux-kernel - Re: [PATCH 2/5] dma_map_sg

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Message-Id: <20071221112256X.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 21 Dec 2007 11:22:56 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	davem@...emloft.net
Cc:	rusty@...tcorp.com.au, fujita.tomonori@....ntt.co.jp,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com
Subject: Re: [PATCH 2/5] dma_map_sg_ring() helper

On Thu, 20 Dec 2007 16:40:00 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Rusty Russell <rusty@...tcorp.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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