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

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Message-ID: <c384c5ea0812031400s58bcec3du7fc86802ad413e30@mail.gmail.com>
Date:	Wed, 3 Dec 2008 23:00:30 +0100
From:	"Leon Woestenberg" <leon.woestenberg@...il.com>
To:	edward_estabrook@...lent.com
Cc:	linux-kernel@...r.kernel.org, hjk@...utronix.de, gregkh@...e.de,
	edward.estabrook@...il.com, edward.estabrook.lkml@...il.com
Subject: Re: [PATCH 1/1] Userspace I/O (UIO): Add support for userspace DMA

Hello Edward,

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