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

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Date:	Sun, 13 Sep 2009 23:36:10 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Mark Hounschell <markh@...pro.net>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-pci@...r.kernel.org,
	Mark Hounschell <dmarkh@....rr.com>,
	linux-kernel@...r.kernel.org
Subject: Re: problems doing direct dma from a pci device to pci-e device

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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