linux-kernel - Re: PCIe device driver question

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Message-ID: <20080730175542.04eb9eb3@lxorguk.ukuu.org.uk>
Date:	Wed, 30 Jul 2008 17:55:42 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Sanka Piyaratna <cesanka@...oo.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: PCIe device driver question

On Wed, 30 Jul 2008 09:09:36 -0700 (PDT)
Sanka Piyaratna <cesanka@...oo.com> wrote:

> Hi Alan,
> 
> Actually the failures occur at addresses lot higher than this range, I am noticing the failure at dma address 0x0000000037845000. This would be at around 900MB ?

For x86 we don't do anything special and if your hardware is flagging the
memory as absent perhaps you should consult the hardware/bridge
documentation firt ?

In some cases (over 4GB and 32bit DMA masks set) we will use the GART on
x86-64 but that will still see addresses below 4GB being sent to the
device.

Alan
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