netdev - Re: [PATCH] PA Semi PWRficient Ethernet driver

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Date:	Tue, 30 Jan 2007 10:06:49 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Olof Johansson <olof@...om.net>
Cc:	Francois Romieu <romieu@...zoreil.com>, jgarzik@...ox.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH] PA Semi PWRficient Ethernet driver

On Mon, Jan 29, 2007 at 07:41:16PM -0600, Olof Johansson wrote:
> Maybe a bit of introduction could be useful (also regarding the
> pci_map/alloc comments below).
> 
> Our devices are on-chip, and while they're not on a PCI(e) bus internally,
> they do have config headers and will show up as devices on a pseudo-bus
> (the root one, in fact).
> 
> Also, while the driver could go through the IOMMU layers, there's no
> real use in doing so at this time.

sorry, but bypassing this is not what what we want in drivers at all.
In case you have an iommu and don't want it on the root bus chose
the noop dma implementation for this bus, which is easily possible on
powerpc.

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