linux-kernel - Re: DMA using data buffer vmapped in kernel space

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Message-Id: <20100309.012935.98310472.davem@davemloft.net>
Date:	Tue, 09 Mar 2010 01:29:35 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	linux@....linux.org.uk
Cc:	mkl0301@...il.com, thomas@...ller.dyndns.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: DMA using data buffer vmapped in kernel space

From: Russell King - ARM Linux <linux@....linux.org.uk>
Date: Tue, 9 Mar 2010 09:14:03 +0000

> What you could do is prepare a patch to allow the firmware support to
> export a scatterlist via the struct firmware, and then use that with
> dma_map_sg().  Let's hope that the SPI interfaces support scatterlists.

It's so common to want a scatterlist from a vmalloc/vmap area
that a generic common helper is probably the best.

Just iterate over the vmalloc/vmap area using vmalloc_to_page()
to fill in the SG entries.
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