linux-kernel - Re: [PATCH v2 1/5] drivers: of: add initialization code for reserved memory

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Date:	Tue, 11 Feb 2014 14:19:33 -0600
From:	Josh Cartwright <joshc@...eaurora.org>
To:	Tomasz Figa <tomasz.figa@...il.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Likely <grant.likely@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-mm-sig@...ts.linaro.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Michal Nazarewicz <mina86@...a86.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Rob Herring <robh+dt@...il.com>,
	Olof Johansson <olof@...om.net>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ian.campbell@...rix.com>,
	Kumar Gala <galak@...eaurora.org>,
	Nishanth Peethambaran <nishanth.p@...il.com>,
	Marc <marc.ceeeee@...il.com>
Subject: Re: [PATCH v2 1/5] drivers: of: add initialization code for reserved
 memory

On Tue, Feb 11, 2014 at 09:04:21PM +0100, Tomasz Figa wrote:
> 
> 
> On 11.02.2014 21:02, Benjamin Herrenschmidt wrote:
> >On Tue, 2014-02-11 at 19:01 +0000, Grant Likely wrote:
> >
> >>>except that the former IMHO better suits the definition of memory
> >>>region, which I see as a single contiguous range of memory and can be
> >>>simplified to have a single reg entry per region.
> >>
> >>My point is rather if multiple reg tuples are found in a reserved memory
> >>node, the kernel must respect them and reserve the memory. I'm not
> >>arguing about whether or not that makes for a good binding.
> >
> >agreed.
> 
> My point is why, if the binding defines that just a single tuple should be
> provided.

FWIW, the usecase I had mentioned in reply to Grant in the patch 5/5
thread [1] could make use of this.  The shared memory region is split
into a main chunk and several "auxiliary" chunk, but collectively these
regions all share the same heap state.

  Josh

1: http://lkml.kernel.org/r/20140205192502.GO20228@joshc.qualcomm.com

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