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

Leon Woestenberg
2008-12-03T22:00:40Z

Hello Edward,

On Wed, Dec 3, 2008 at 10:39 PM, <edward_estabrook@agilent.com> wrote:
> From: Edward Estabrook <Edward_Estabrook@agilent.com>
>
> 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?

Regards,
---
Leon