Subject: Re: Physically contiguous (DMA) memory allocation
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Anthony Truong <Anthony.Truong@mascorp.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
In-Reply-To: <1060328695.9074.95.camel@huykhoi>
References: <1060328695.9074.95.camel@huykhoi>
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Date: 09 Aug 2003 11:59:01 +0100
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On Gwe, 2003-08-08 at 08:44, Anthony Truong wrote:
> Is there a quick solution to this problem, like increasing the size of
> the physically contiguous page pool (like in Windows NT and some other
> OS'es :-( )? (Is it a good idea to make this one of the future
> enhancements to Linux?)  Or should I write a driver loaded at boot time
> grabbing the required memory pages and allocating them to my loadable
> driver when requested?
> Your suggestion is very much appreciated.

Without source code its hard to tell what you are doing but all
allocations made with the pci_* API in Linux are contiguous. If your
hardware requires a single contiguous 30Mb chunk then you have a problem
and will need to allocate at boot time.

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