linux-kernel - Re: [PATCH 0/8] x86 dma_*_coherent rework patchset v2

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Message-Id: <20080821231230V.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 21 Aug 2008 23:16:50 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	joerg.roedel@....com, fujita.tomonori@....ntt.co.jp,
	jbarnes@...tuousgeek.org, mingo@...hat.com, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, muli@...ibm.com
Subject: Re: [PATCH 0/8] x86 dma_*_coherent rework patchset v2

On Wed, 20 Aug 2008 11:46:12 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Joerg Roedel <joerg.roedel@....com> wrote:
> 
> > Hi,
> > 
> > this patchset reworks the dma_*_coherent functions in the DMA layer 
> > for the x86 architecture. The patch series extends the existing DMA 
> > backends with missing *coherent callbacks and simplifies the generic 
> > function to basically only call the registered backend. This allows 
> > future optimizations in hardware specific IOMMU implementations. The 
> > code ist tested on AMD64 with AMD IOMMU, GART, SWIOTLB and NOMMU as 
> > well as on my old 486 box. Muli tested the Calgary specific patch.
> > 
> > Joerg
> > 
> > Changes since v1:
> > 
> > - fixed wrong logic in the pci-nommu alloc_coherent code
> > - moved dma_*_coherent to include/asm-x86/dma-mapping.h
> > 
> > git diff --stat tip/master.. :
> > 
> >  arch/x86/kernel/amd_iommu.c      |    2 -
> >  arch/x86/kernel/pci-calgary_64.c |   14 ++++
> >  arch/x86/kernel/pci-dma.c        |  146 +-------------------------------------
> >  arch/x86/kernel/pci-gart_64.c    |   35 +++++++++-
> >  arch/x86/kernel/pci-nommu.c      |   62 ++++++++++++++++
> >  include/asm-x86/dma-mapping.h    |   47 ++++++++++---
> >  6 files changed, 149 insertions(+), 157 deletions(-)
> 
> applied to tip/x86/iommu - thanks Joerg!
> 
> Jesse, Fujita-san, do these changes look fine to you?

As I wrote in another mail, GART should return zeroed memory (keeping
the current behavior is better). Except for it, the patchset looks
fine.
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