From: Arnd Bergmann <arnd@arndb.de>
To: David Sin <davidsin@ti.com>
Cc: linux-arm-kernel@lists.infradead.org,
dri-devel@lists.freedesktop.org, Greg KH <greg@kroah.com>,
Russell King <rmk@arm.linux.org.uk>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org
Subject: Re: [PATCH 0/9] TI DMM-TILER driver
Date: Thu, 16 Dec 2010 18:43:48 +0100 [thread overview]
Message-ID: <201012161843.48262.arnd@arndb.de> (raw)
In-Reply-To: <20101216173737.GA6767@lba0869738>
On Thursday 16 December 2010 18:37:38 David Sin wrote:
> I'm not sure exactly how DRM/GEM works.. What functionality do you think is
> overlapping? The main feature, aside from reduced page accesses, of the DMM
> hw block is to provide physically contiguous 2 dimensional memory blocks for
> image and video processing. This hw sits between the interconnect and the
> ext memory interface in the OMAP, and contains an MMU-like address traslator
> for "virtually" physically contiguous memory and sdram pages.
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
next prev parent reply other threads:[~2010-12-16 17:44 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-06 22:27 [PATCH 0/9] TI DMM-TILER driver David Sin
2010-12-06 22:27 ` [PATCH 1/9] TILER-DMM: DMM-PAT driver for TI TILER David Sin
2010-12-06 22:27 ` [PATCH 2/9] TILER-DMM: Container manager interface and utility definitons David Sin
2010-12-06 22:27 ` [PATCH 3/9] TILER-DMM: Sample TCM implementation: Simple TILER Allocator (SiTA) David Sin
2010-12-06 22:27 ` [PATCH 4/9] TILER-DMM: TILER Memory Manager interface and implementation David Sin
2010-12-06 22:27 ` [PATCH 5/9] TILER-DMM: TILER interface file and documentation David Sin
2010-12-06 22:27 ` [PATCH 6/9] TILER-DMM: Geometry and view manipulation functions David Sin
2010-12-06 22:27 ` [PATCH 7/9] TILER-DMM: Main TILER driver implementation David Sin
2010-12-06 23:21 ` Tony Lindgren
2010-12-13 17:32 ` David Sin
2010-12-06 22:27 ` [PATCH 8/9] TILER-DMM: Linking TILER driver into the Linux kernel build David Sin
2010-12-06 22:27 ` [PATCH 9/9] TILER-DMM: Device support for OMAP David Sin
2010-12-16 13:34 ` [PATCH 0/9] TI DMM-TILER driver Arnd Bergmann
2010-12-16 17:25 ` David Sin
2010-12-16 17:37 ` David Sin
2010-12-16 17:43 ` Arnd Bergmann [this message]
2010-12-16 19:02 ` David Sin
2010-12-16 23:28 ` Dave Airlie
2010-12-22 14:33 ` David Sin
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