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

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Date:	Fri, 6 Aug 2010 10:02:36 +1000
From:	Peter Crosthwaite <peter.crosthwaite@...alogix.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
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

Hi Everyone,

Thanks for your replies. I am going to stick with my start_kernel()
edit until this CMA engine comes along.

Regards,
Peter

On Thu, Aug 5, 2010 at 10:16 AM, FUJITA Tomonori
<fujita.tomonori@....ntt.co.jp> wrote:
> 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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