linux-kernel - Re: [bug] ata subsystem related crash with latest -git

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Message-Id: <20071019175903N.fujita.tomonori@lab.ntt.co.jp>
Date:	Fri, 19 Oct 2007 17:59:03 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	jens.axboe@...cle.com
Cc:	arjan@...radead.org, torvalds@...ux-foundation.org,
	davem@...emloft.net, fujita.tomonori@....ntt.co.jp, mingo@...e.hu,
	linux-kernel@...r.kernel.org, jgarzik@...ox.com,
	alan@...rguk.ukuu.org.uk, tomof@....org
Subject: Re: [bug] ata subsystem related crash with latest -git

On Thu, 18 Oct 2007 19:14:29 +0200
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Thu, Oct 18 2007, Arjan van de Ven wrote:
> > On Thu, 18 Oct 2007 09:55:04 -0700 (PDT)
> > Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > 
> > > 
> > > 
> > > On Thu, 18 Oct 2007, Jens Axboe wrote:
> > > > -		unsigned long addr = page_to_phys(s->page) +
> > > > s->offset; 
> > > > +		unsigned long addr = page_to_phys(sg_page(s)) +
> > > > s->offset; 
> > > 
> > > Umm. May I suggest (I haven't read the whole thread yet, maybe
> > > somebody else already did) that
> > > 
> > > 	static inline unsigned long sg_phys(struct scatterlist *sg)
> > > 	{
> > > 		return 	page_to_phys(sg_page(sg)) + sg->offset;
> > > 	}
> > > 
> > > would be a good thing to have?
> > > 
> > > Very few drivers should care so much about the *page* itself (or the 
> > > offset). That's something that the generic allocation code etc cares 
> > > about, but the driver is almost bound to care mostly about the actual
> > > DMA address
> > 
> > .... but will that work for systems with IOMMU ? or is it fundamentally
> > the wrong interface
> 
> They use foo_to_bus() on the address. sg_phys() should of course only be
> used where the user previously did page_to_phys() on the sg page.

I can take care of IOMMU stuff when I'll send IOMMU merging fix
patchset:

http://marc.info/?l=linux-scsi&m=119079718126157&w=2
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