linux-kernel - UIO DMA to userspace question

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Message-ID: <AANLkTimWdaBrJz-dQ3MHWwG7iZ5m1opSmLFKva880csi@mail.gmail.com>
Date:	Sat, 7 Aug 2010 20:38:30 +0200
From:	Leon Woestenberg <leon.woestenberg@...il.com>
To:	Tom Lyon <pugs@...co.com>, mst@...hat.com, hjk@...utronix.de,
	gregkh@...e.de, chrisw@...s-sol.org, joro@...tes.org,
	avi@...hat.com, linux-kernel@...r.kernel.org
Subject: UIO DMA to userspace question

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?

Thanks,
-- 
Leon
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