linux-kernel - Re: UIO DMA to userspace question

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Date:	Sun, 15 Aug 2010 14:33:08 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Leon Woestenberg <leon.woestenberg@...il.com>
CC:	Tom Lyon <pugs@...co.com>, mst@...hat.com, hjk@...utronix.de,
	gregkh@...e.de, chrisw@...s-sol.org, joro@...tes.org,
	linux-kernel@...r.kernel.org
Subject: Re: UIO DMA to userspace question

  On 08/07/2010 09:38 PM, Leon Woestenberg wrote:
> Hello all,
>
> can I use the UIO framework for the following?
>
> The userspace portion of the driver allocates memory in user-space
> using malloc() - usually resulting in a scatter pages in physical
> memory.
> The UIO kernel portion of the driver maps those using pci_map_sg().
>
> Is this possible, or does the UIO framework assume memory for DMA is
> allocated in kernel space?

Look at the new VFIO driver, which can do DMA if you have an IOMMU.

-- 
error compiling committee.c: too many arguments to function

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