linux-kernel - Re: [PATCH 0 of 9] swiotlb: use phys_addr

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Message-Id: <20081228020312K.fujita.tomonori@lab.ntt.co.jp>
Date:	Sun, 28 Dec 2008 02:03:37 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	fujita.tomonori@....ntt.co.jp, jeremy@...p.org,
	tony.luck@...el.com, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com, x86@...nel.org,
	ian.campbell@...rix.com, beckyb@...nel.crashing.org
Subject: Re: [PATCH 0 of 9] swiotlb: use phys_addr_t for pages

On Sat, 27 Dec 2008 17:56:22 +0100
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:
> 
> > On Sat, 27 Dec 2008 11:48:23 +0100
> > Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > Also, this patch will interact with ia64 materially:
> > > 
> > >   Subject: [PATCH 9 of 9] ia64/x86/swiotlb: use enum dma_data_direciton in dma_ops
> > > 
> > > So we'll need a bit more confidence in the testing status of this queue, 
> > > and we probably want to wait until Tony merged the pending .29 ia64 
> > > changes, and also get an Ack from Tony for these bits:
> > > 
> > >  arch/ia64/dig/dig_vtd_iommu.c       |    9 +++--
> > >  arch/ia64/hp/common/hwsw_iommu.c    |   22 ++++++++------
> > >  arch/ia64/hp/common/sba_iommu.c     |   12 ++++---
> > >  arch/ia64/include/asm/dma-mapping.h |   29 +++++++++---------
> > >  arch/ia64/include/asm/swiotlb.h     |   26 ++++++++++------
> > >  arch/ia64/kernel/machvec.c          |    6 ++-
> > >  arch/ia64/sn/kernel/io_common.c     |    3 +-
> > >  arch/ia64/sn/pci/pci_dma.c          |   21 ++++++++-----
> > >  arch/ia64/sn/pci/pcibr/pcibr_dma.c  |    3 +-
> > >  arch/ia64/sn/pci/tioca_provider.c   |    3 +-
> > > 
> > > (Tony Cc:-ed)
> > 
> > BTW, the above patch breaks IA64 build.
> > 
> > It's fixable but I think that it would be better to just drop this huge 
> > patch and add some cast in powerpc code. the types of SWIOTBL function 
> > arguments don't need to mach to DAM_API.txt though it might be nice if 
> > so. There are other type mismatches. If we really want to do this 
> > cleanups, we should fix up all the mismatches.
> 
> hm, we shouldnt do ugly typecasts - lets fix all the places. As Jeremy 
> indicated, this is work in progress.

It's not about this patchset, swiotlb. I'm talking about all the
mismatches of dma mapping operations. But it need huge patches
(touching lots of the architectures). I'm not sure it is worth doing
it. Even if we want, it's not the job that this swiotlb patches does.
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