Re: PCI DMA into USER space

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hpa@zytor.com said:
> > Does anyone have an example (that works) of how to DMA from a PCI card
> > into user space on a PC running Linux? We do this on Unix systems
> > and need to be able to do this under Linux.

> You can't do it. Reserve kernel memory instead and provide an mmap()
> interface for your device.

I do it quite happily for PCI framegrabber cards which don't have onboard
framestore - they can only BM-DMA from a FIFO of incoming data from the
camera.

See sct's raw-io patches if you're on 2.2, or include/linux/iobuf.h if
you're on 2.[34].

ftp://ftp.uk.linux.org/pub/linux/sct/fs/raw-io/

--
dwmw2
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• Next message: Alexander S A Kjeldaas: "Re: Cryptography in the kernel (was: Re: Linux 2.5 / 2.6 TODO (preliminary))"
• Previous message: Rik van Riel: "Re: patching 2.4.0test1"
• In reply to: H. Peter Anvin: "Re: PCI DMA into USER space"
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