[PATCH/RFC 0/8] ARM: DMA-mapping framework redesign

Marek Szyprowski m.szyprowski at samsung.com
Fri Jun 24 10:26:12 EDT 2011


On Friday, June 24, 2011 11:18 AM Joerg Roedel wrote:

> On Mon, Jun 20, 2011 at 09:50:05AM +0200, Marek Szyprowski wrote:
> > This patch series is a continuation of my works on implementing generic
> > IOMMU support in DMA mapping framework for ARM architecture. Now I
> > focused on the DMA mapping framework itself. It turned out that adding
> > support for common dma_map_ops structure was not that hard as I initally
> > thought. After some modification most of the code fits really well to
> > the generic dma_map_ops methods.
> I appreciate your progress on this generic dma_ops implementation. But
> for now it looks very ARM specific. Do you have plans to extend it to
> non-ARM iommu-api implementations too?

These works are just a first step to create an environment for real iommu 
& dma-mapping integration. It is much easier to work on IOMMU integration
once the dma-mapping operations can be easily changed for particular devices.
dma_map_ops gives such flexibility. It is also a de-facto standard interface
for other architectures so it was really desired to work on iommu
implementation on top of dma_map_ops.

Of course my patches will be ARM-centric, but I hope to isolate ARM-specific
from generic parts, which can be easily reused on other platforms. 

Best regards
Marek Szyprowski
Samsung Poland R&D Center

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