linux-kernel - Re: Using Bootmem for large DMA buffers in the presence of the slab allocator

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Message-Id: <20100805091523U.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 5 Aug 2010 09:16:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	peter.crosthwaite@...alogix.com
Cc:	linux-kernel@...r.kernel.org, cl@...ux-foundation.org,
	penberg@...helsinki.fi, mpm@...enic.com,
	michal.simek@...alogix.com, edgar.iglesias@...alogix.com,
	john.williams@...alogix.com
Subject: Re: Using Bootmem for large DMA buffers in the presence of the
 slab 	allocator

On Wed, 4 Aug 2010 16:07:52 +1000
Peter Crosthwaite <peter.crosthwaite@...alogix.com> wrote:

> I am currently developing Kernel code to allocate and reserve a large
> (64MB) contiguous buffer for DMA.

A buffer needs to be physically continuous (your hardware can't do
scatter gather)? If so, as already pointed out, there is no pretty
solution for it.

There are some drivers that need to do such so the issue has been
under discussion:

http://marc.info/?l=linux-mm&m=128015343705933&w=2
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