From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Sanka Piyaratna <cesanka@yahoo.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PCIe device driver question
Date: Wed, 30 Jul 2008 17:55:42 +0100 [thread overview]
Message-ID: <20080730175542.04eb9eb3@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <257182.1206.qm@web31708.mail.mud.yahoo.com>
On Wed, 30 Jul 2008 09:09:36 -0700 (PDT)
Sanka Piyaratna <cesanka@yahoo.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
next prev parent reply other threads:[~2008-07-30 17:13 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-30 16:09 Sanka Piyaratna
2008-07-30 16:51 ` V.Radhakrishnan
2008-07-30 16:55 ` Alan Cox [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-07-31 9:58 Sanka Piyaratna
2008-07-30 22:55 Sanka Piyaratna
2008-07-31 8:44 ` Robert Hancock
[not found] <fa.+kKL98uFtvbcX3ymh2HlJuUDVwY@ifi.uio.no>
2008-07-30 19:24 ` Robert Hancock
[not found] <fa.PmBLCqOb4Xo53y3W9hAdnsU50Og@ifi.uio.no>
[not found] ` <fa.42mxuHHJP7XQmYeyxNoEC/NFUHA@ifi.uio.no>
2008-07-30 19:21 ` Robert Hancock
2008-07-31 13:11 ` V.Radhakrishnan
2008-07-31 17:37 ` Robert Hancock
2008-07-31 18:47 ` V.Radhakrishnan
2008-07-31 18:52 ` Robert Hancock
2008-07-31 20:47 ` V.Radhakrishnan
2008-07-30 16:00 Sanka Piyaratna
2008-07-30 15:47 ` Alan Cox
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