From: Jiri Slaby <jirislaby@gmail.com>
To: Ke <kecore@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: PCI DMA address
Date: Mon, 18 Feb 2008 17:49:36 +0100 [thread overview]
Message-ID: <47B9B720.9020000@gmail.com> (raw)
In-Reply-To: <63aa4aaa0802180705i76229711v8ed9fb2b1ea242df@mail.gmail.com>
On 02/18/2008 04:05 PM, Ke wrote:
> Hello all,
> How can kernel get the PCI DMA address above 16MB or 64MB?
Documentation/DMA*
> I hope that the all PCI devices can use a dma address above
> 0x1000000 at a higher memory.
Depends on how much is the device broken or what it can do.
IIRC you'll always get memory from DMA-zone for < ~0U dma_masks on kernels older
than 2.6.(around 10). If you set dma_masks to < ~0U, you will probably (in the
meaning, kernel will try to allocate from higher space and fall back to the
dma-zone) get higher pages nowadays. However I don't know how far this applies
also to systems with iommu in retrospective.
next prev parent reply other threads:[~2008-02-18 16:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-18 15:05 PCI DMA address Ke
2008-02-18 16:49 ` Jiri Slaby [this message]
[not found] <a826e204.0404282237.6a6b28b0@posting.google.com>
2004-05-01 5:19 ` PCI DMA Address Robert Hancock
2004-05-01 13:47 ` Richard B. Johnson
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