linux-kernel - Re: [linux-dvb] [PATCH] Userspace tuner

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Message-ID: <46EA77DE.8060109@gmail.com>
Date:	Fri, 14 Sep 2007 16:00:30 +0400
From:	Manu Abraham <abraham.manu@...il.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	Markus Rechberger <mrechberger@...il.com>,
	"linux-dvb@...uxtv.org" <linux-dvb@...uxtv.org>,
	"video4linux-list@...hat.com" <video4linux-list@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [linux-dvb] [PATCH] Userspace tuner

Joerg Roedel wrote:
> On Fri, Sep 14, 2007 at 11:57:59AM +0400, Manu Abraham wrote:
>>>>> What do you think about IOMMU?
>>>>>
>>>>>
>>>> Just because AMD or INTEL want to invent some whizzy new technology it
>>>> doesn't say anything about the TV card development and retail business.
>>>> Intel and AMD have teams of Linux engineers helping operating system
>>>> developers bring their ideas and technologies to new platforms. That's a
>>>> million miles away from any of the TV board vendors I know of, who have
>>>> little or NO fulltime linux developers and consider the < 5% market
>>>> fringe at best.
>>>>
>>> it helps to virtualize devices and introduces newer features for that.
>>> Some interesting projects could be derrived out of that, there are
>>> quite a few interesting papers floating around how drivers could be
>>> handled in future.
>>>
>> IOMMU can be considered similar to the AGP GART, which is similar,
>> remapping the Addresses, as far as i understand.
> 
> Common new IOMMUs have only very few in common with the AGP GART. In
> fact, with current modern IOMMU hardware it will be possible to
> implement secure userspace device drivers that are even able to do DMA.
> This is not possible with the GART.
> 
>> Though you get a physical to virtual translation, what about interrupts,
> 
> Modern IOMMUs are able to remap interrupts. This will solve the problem
> with PCI interrupt sharing.

What CPU's are we talking about ?

Thanks for the explanation.

Manu

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