linux-kernel - Re: [PATCHv3 08/16] staging: vme_user: provide DMA functionality

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Date:	Mon, 6 Jul 2015 14:22:31 +0100
From:	Martyn Welch <martyn.welch@...com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dmitry Kalinkin <dmitry.kalinkin@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <devel@...verdev.osuosl.org>,
	"Manohar Vanga" <manohar.vanga@...il.com>,
	Igor Alekseev <igor.alekseev@...p.ru>
Subject: Re: [PATCHv3 08/16] staging: vme_user: provide DMA functionality

On 13/06/15 01:28, Greg Kroah-Hartman wrote:
> On Thu, May 28, 2015 at 03:07:05PM +0300, Dmitry Kalinkin wrote:
>> This introduces a new dma device that provides a single ioctl call that
>> provides DMA read and write functionality to the user space.
>>
>> Signed-off-by: Dmitry Kalinkin <dmitry.kalinkin@...il.com>
>> Cc: Igor Alekseev <igor.alekseev@...p.ru>
>> ---
>>   drivers/staging/vme/devices/vme_user.c | 201 ++++++++++++++++++++++++++++++++-
>>   drivers/staging/vme/devices/vme_user.h |  11 ++
>>   2 files changed, 209 insertions(+), 3 deletions(-)
>
> I want to get Martyn's feedback on this, as it's adding a new feature to
> the subsystem that he's going to have to maintain.
>

Sorry about the *really* late reply, loads of emails some how missed my 
periodic search of the mailing list.

I'm happy with the addition of DMA, just not sure whether it's worth 
adding an extra device file just to handle DMA. Could the user space 
application not just use the control device?

-- 
Martyn Welch (Lead Software Engineer)  | Registered in England and Wales
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