Re: DMA to user space
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From: Andreas B. <and...@mu...> - 2000-04-14 01:40:55
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On Thu, Apr 13, 2000 at 01:05:57PM +0300, And...@no... wrote: > Hi Andreas and Sebastien, > > I was wondering if you could give me some estimate of when to expect DMA > transfer or mapping of iso data to user space? I would really want to have > this for our DV decoder. Second on my ToDo list (after getting that subsystem initiated transactions and GUID collecting to work). The first step to zero copy would be to make the hardware drivers use subsystem provided buffers for iso receiving instead of their own (and write code to manage locking and automatic freeing of those buffers in the subsystem). After that exists it would be a small step to actually mapping those buffers to user space. I don't think implementing mapping in the current raw1394 would a good idea since it would have to be rewritten then. -- Andreas E. Bombe <and...@mu...> DSA key 0x04880A44 http://home.pages.de/~andreas.bombe/ http://linux1394.sourceforge.net/ |