Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760010AbXINMAx (ORCPT ); Fri, 14 Sep 2007 08:00:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752509AbXINMAm (ORCPT ); Fri, 14 Sep 2007 08:00:42 -0400 Received: from wx-out-0506.google.com ([66.249.82.232]:44775 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751826AbXINMAk (ORCPT ); Fri, 14 Sep 2007 08:00:40 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:content-type:content-transfer-encoding; b=L8aPr4IPBoxSM1lWB+EDmdUFbIDy8JlpYkM3K7Vy5xZI8Ka40R7hqEY8WnX9CYI6Peo/NPndzPcaugsuOQsrCtJcvOCOtv60hTTjgZz3F3C+8PEJ3xI0z6lKpsLzqU6mnPDCXr7Z+YeUa0YCbsMBuykBqjtNh9cmapbwSr8Rvb8= Message-ID: <46EA77DE.8060109@gmail.com> Date: Fri, 14 Sep 2007 16:00:30 +0400 From: Manu Abraham User-Agent: Thunderbird 1.5.0.13 (X11/20070824) MIME-Version: 1.0 To: Joerg Roedel CC: Markus Rechberger , "linux-dvb@linuxtv.org" , "video4linux-list@redhat.com" , "akpm@linux-foundation.org" , "linux-kernel@vger.kernel.org" Subject: Re: [linux-dvb] [PATCH] Userspace tuner References: <20070913131353.GB26972@linuxtv.org> <46E95C54.4060502@gmail.com> <46E99F36.8090809@hauppauge.com> <46E9DDC7.4000403@hauppauge.com> <46EA3F07.9050806@gmail.com> <20070914091535.GA8998@8bytes.org> In-Reply-To: <20070914091535.GA8998@8bytes.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1734 Lines: 42 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 - 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/