Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752969Ab0LPX2L (ORCPT ); Thu, 16 Dec 2010 18:28:11 -0500 Received: from mail-qy0-f174.google.com ([209.85.216.174]:57789 "EHLO mail-qy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751738Ab0LPX2J convert rfc822-to-8bit (ORCPT ); Thu, 16 Dec 2010 18:28:09 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=rSYDAIfjacUhRFqkrx7pdki3KSC3ovjn6Umg4NJF7PnRdiyu3rQ4gd6P/vsNbt7LRh PE/RtVzshHxAMGoxGJzg0MU2cSLADKqXPswBKKwKubh/th0y7jjl0yjhesOZkzjdZgKZ GhT4nyByJszgvP1uREICYQ34INDMjD66uQXwM= MIME-Version: 1.0 In-Reply-To: <20101216190207.GC6767@lba0869738> References: <1291674446-10766-1-git-send-email-davidsin@ti.com> <20101216172531.GG29435@lba0869738> <20101216173737.GA6767@lba0869738> <201012161843.48262.arnd@arndb.de> <20101216190207.GC6767@lba0869738> Date: Fri, 17 Dec 2010 09:28:07 +1000 Message-ID: Subject: Re: [PATCH 0/9] TI DMM-TILER driver From: Dave Airlie To: David Sin Cc: Arnd Bergmann , linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, Greg KH , Russell King , Andrew Morton , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1623 Lines: 37 On Fri, Dec 17, 2010 at 5:02 AM, David Sin wrote: > On Thu, Dec 16, 2010 at 06:43:48PM +0100, Arnd Bergmann wrote: >> As far as I can tell, both DMM and GEM at a high level manage objects >> in video memory. The IOMMU that you have on the Omap hardware seems >> to resemble the GART that sits between PC-style video cards and main >> memory. >> >> I don't know any details, but google quickly finds >> http://lwn.net/Articles/283798/ with a description of the >> initial GEM design. My main thought when looking over the >> DMM code was that this should not be tied too closely to a >> specific hardware, and GEM seems to be an existing abstraction >> that may fit what you need. >> >> ? ? ? Arnd > Thanks for the pointer, Arnd. ?I also found a nice readme file in > the gpu/drm directory, which points to a wiki and source code. > I'll read into this and get back to you. I get the impression with the ARM graphics, that you just have a lot of separate drivers for separate IP blocks all providing some misc random interfaces to userspace where some binary driver binds all the functionality together into a useful whole, which seems like a really bad design. Generally on x86, the tiling hw is part of the GPU and is exposed as part of a coherent GPU driver. I'm just wonder what the use-cases for this tiler are and what open apps can use it for? Dave. -- 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/