From: Robert Hancock <hancockrwd@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Coherent DMA mapping for existing struct page
Date: Mon, 24 Jan 2011 19:28:07 -0600 [thread overview]
Message-ID: <4D3E2727.8060208@gmail.com> (raw)
In-Reply-To: <87ipxevyiq.fsf@inspiron.ap.columbia.edu>
On 01/24/2011 02:26 PM, Nikolaus Rath wrote:
> Hello,
>
> How do I set up a coherent DMA mapping for an existing struct page?
> dma_alloc_coherent() wants to allocate its own buffer, and
> dma_map_page() sets up streaming mappings. Which function am I missing?
I don't think you can do this. On some platforms, only certain memory
can be used for coherent DMA, so you can't just use any arbitrary page.
prev parent reply other threads:[~2011-01-25 1:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-24 20:26 Coherent DMA mapping for existing struct page Nikolaus Rath
2011-01-25 1:28 ` Robert Hancock [this message]
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