linux-kernel - Re: [PATCH 0/7] x86 dma_*

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Message-Id: <20080813095223R.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 13 Aug 2008 09:51:59 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	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 0/7] x86 dma_*_coherent rework patchset

On Tue, 12 Aug 2008 17:24:10 +0200
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 and GART as well as on my old 486
> box. It is not yet tested on a Calgary IOMMU system.
> 
> Joerg
> 
> 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        |  116 +++----------------------------------
>  arch/x86/kernel/pci-gart_64.c    |   31 ++++++++++
>  arch/x86/kernel/pci-nommu.c      |   45 +++++++++++++++
>  5 files changed, 100 insertions(+), 108 deletions(-)

Really nice. I think that this is how other architectures that support
multiple IOMMUs handle dma operations, and this is the right thing for
x86 too.
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