Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758696AbXINTiT (ORCPT ); Fri, 14 Sep 2007 15:38:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752558AbXINTiM (ORCPT ); Fri, 14 Sep 2007 15:38:12 -0400 Received: from an-out-0708.google.com ([209.85.132.242]:5944 "EHLO an-out-0708.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751398AbXINTiK (ORCPT ); Fri, 14 Sep 2007 15:38:10 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=ua/TDLak94BF2ZWjYhu/kdJ1Hpjd6TgWpve7P7KW9HayfdgB/sW3PSxO+rX2gWWNNo4bU7yCUFgZMxaim8mhd+8eQYVv46keYV5uAUnTg5r+SVasVN1cvZghg6gIB3qpTTdCTrrOfYmw7f8sFCYLC+dU744BJ1XzI6cSE3j4nCk= Message-ID: Date: Fri, 14 Sep 2007 15:38:09 -0400 From: "Alex Deucher" To: "Markus Rechberger" Subject: Re: [linux-dvb] [PATCH] Userspace tuner Cc: "Manu Abraham" , "linux-dvb@linuxtv.org" , "video4linux-list@redhat.com" , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <46E9DDC7.4000403@hauppauge.com> <46EA3F07.9050806@gmail.com> <20070914091535.GA8998@8bytes.org> <46EA77DE.8060109@gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2782 Lines: 70 On 9/14/07, Markus Rechberger wrote: > On 9/14/07, Alex Deucher wrote: > > On 9/14/07, Markus Rechberger wrote: > > > On 9/14/07, Manu Abraham 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/