linux-kernel - Re: problems doing direct dma from a pci device to pci-e device

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Message-ID: <4AADF8C5.2000205@cfl.rr.com>
Date:	Mon, 14 Sep 2009 04:03:17 -0400
From:	Mark Hounschell <dmarkh@....rr.com>
To:	Grant Grundler <grundler@...isc-linux.org>
CC:	Mark Hounschell <markh@...pro.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: problems doing direct dma from a pci device to pci-e device

Grant Grundler wrote:
> On Fri, Sep 11, 2009 at 04:04:00PM -0400, Mark Hounschell wrote:
>> A quick readup on the IOMMU makes me think that if it does use one, that
>> could certainly cause my problem. I'm using bus addresses plugged into
>> page tables that live in the gpiohsd card obtained from virt2bus.
> 
> If you haven't yet, take a look at Documentation/DMA-API.txt and
> DMA-mapping.txt . virt2bus has been deprecated for DMA since 2.4 releases.
> 
> grant
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It still gives me a bus address just fine. Actually when the gpiohsd is dmaing
into another card I don't use it. I misspoke. The VMIC cards library API gives
me its memory's bus address.

Mark
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