linux-kernel - Re: [PATCH 4/7] swiotlb: Allow arch override of address_needs

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Date:	Fri, 10 Apr 2009 03:50:13 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	galak@...nel.crashing.org
Cc:	fujita.tomonori@....ntt.co.jp, jeremy@...p.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, mingo@...e.hu,
	ian.campbell@...rix.com, beckyb@...nel.crashing.org
Subject: Re: [PATCH 4/7] swiotlb: Allow arch override of
 address_needs_mapping

On Wed, 8 Apr 2009 23:59:18 -0500
Kumar Gala <galak@...nel.crashing.org> wrote:

> 
> On Apr 8, 2009, at 6:01 PM, FUJITA Tomonori wrote:
> 
> >> Becky's patches of last week also added __weak annotations to
> >> swiotlb_bus_to_virt, virt_to_bus and bus_to_phys; added the hwdev
> >> parameter to swiotlb_bus_to_phys; and added a weak
> >> swiotlb_arch_address_needs_mapping.  I assume that was needed because
> >> powerpc needs non-trivial implementations for those functions.
> >
> > Hmm, what she added are wrappers of virt_to_bus and bus_to_virt. We
> > can remove these and directly use virt_to_bus and bus_to_virt.
> >
> > About __weak address_needs_mapping function, as I said, removing it
> > and using dma_map_ops is a proper solution.
> 
> Is this something you are looking at doing in the .31 timeframe?
> 
> I'm looking at the fact that we need to switch over to using struct  
> dma_map_ops on ppc.  (I'm guessing this might be the patches you  
> mentioned the other day).  If so did you add set_dma_mask() to the  
> generic dma_map_ops?

Yeah, I'll send patches to convert ppc to use dma_map_ops. In .31
timeframe, I plan to:

- add a generic dma-mapping.h and convert ia64, x86, and ppc to use it

- clean up swiotlb.

- try to convert archs supporting multiple dma ops to use dma_map_ops

- rewrite ia64 and x86 dma ops initialization


BTW, the ppc specific swiotlb patchset is available?
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