Re: [PATCH 1/1] Userspace I/O (UIO): Add support for userspace DMA

From: Leon Woestenberg
Date: Wed Dec 03 2008 - 17:00:42 EST

Hello Edward,

On Wed, Dec 3, 2008 at 10:39 PM, <edward_estabrook@xxxxxxxxxxx> wrote:
> From: Edward Estabrook <Edward_Estabrook@xxxxxxxxxxx>
> Here is a patch that adds the ability to dynamically allocate (and use) coherent DMA from userspace by extending the userspace IO driver. This patch applies against 2.6.28-rc6.
You are using a magic value to mmap(), just to keep options open:

Would this in the future allow us to also add support for streaming
non-coherent DMA directly into user space buffers?

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