[Ksummit-2012-discuss] [ATTEND] DMA-mapping subsystem discussion

Konrad Rzeszutek Wilk konrad at darnok.org
Tue Jun 26 22:32:10 UTC 2012

On Tue, Jun 26, 2012 at 09:44:45AM +0200, Marek Szyprowski wrote:
> For over 3 years I'm developing device drivers and parts of the platform 
> core support for Samsung SoCs series. I'm co-author of VideoBuf2 framework
> [1] (merged in v2.6.39) and Contiguous Memory Allocator [2-4] (merged in 
> v3.5-rc1). For last year I'm also working on extending DMA-mapping subsystem
> (mainly on ARM architecture) with better support for nowadays hardware. I've
> developed integration layer for IOMMU for DMA-mapping subsystem on ARM 
> architecture and proposed some extensions for improving zero-copy data 
> processing between devices [5].
> I would like to propose a discussion on the current state of the 
> DMA-mapping subsystem, its limitations and possible as well as the existing
> extensions. I'm also interested in discussing a major redesign approach
> for solving some of the issues identified in the current implementation.

Could you summarize some of issues identified? Thanks.

> [1] 'The videobuf2 API': http://lwn.net/Articles/447435/
> [2] 'A reworked contiguous memory allocator': http://lwn.net/Articles/447405/
> [3] 'CMA and ARM': http://lwn.net/Articles/450286/
> [4] 'A deep dive into CMA': http://lwn.net/Articles/486301/
> [5] 'ARM: DMA-mapping: new extensions for buffer sharing': http://lwn.net/Articles/501744/
> Best regards
> -- 
> Marek Szyprowski
> Samsung Poland R&D Center
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