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

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Date:	Fri, 14 Sep 2007 15:38:09 -0400
From:	"Alex Deucher" <alexdeucher@...il.com>
To:	"Markus Rechberger" <mrechberger@...il.com>
Cc:	"Manu Abraham" <abraham.manu@...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

On 9/14/07, Markus Rechberger <mrechberger@...il.com> wrote:
> On 9/14/07, Alex Deucher <alexdeucher@...il.com> wrote:
> > On 9/14/07, Markus Rechberger <mrechberger@...il.com> wrote:
> > > On 9/14/07, Manu Abraham <abraham.manu@...il.com> wrote:
> > > > 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 ?
> > > >
> > >
> > > upcoming x86-64 processors from the AMD side. I'm not into what Intel
> > > is doing in that area at the moment.
> >
> > All AMD64 chips have an IOMMU.  Only Intel's most recent chips do.
> >
>
> It's not available yet, you can read more about it in the following article:
>
> http://developer.amd.com/articlex.jsp?id=101
>
> If you're interested in it I can put together some more information about
> it.

It (the IOMMU) is available on all AMD64 chips.  The newer
virtualization stuff is only on the newer chips.

Alex
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