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

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Date:	Tue, 12 Aug 2008 19:06:58 +0300
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	andi@...stfloor.org
Subject: Re: [PATCH 0/7] x86 dma_*_coherent rework patchset

[added Andi to CC]

On Tue, Aug 12, 2008 at 05:24:10PM +0200, Joerg Roedel 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.

Now it is---appears to work fine on a Calgary system.

In general the patchset looks good and is definitely a step in the
right direction. I am a bit concerned about the contortions that the
generic dma_alloc_coherent went through before calling the ops
version---have you verified they are no longer needed?

Cheers,
Muli
-- 
Workshop on I/O Virtualization (WIOV '08)
Co-located with OSDI '08, Dec 2008, San Diego, CA
http://www.usenix.org/wiov08
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