linux-kernel - Re: [PATCH v6 05/11] drivers: of: add automated assignment of reserved regions to client devices

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Message-Id: <20140514111647.BA6F6C4153D@trevor.secretlab.ca>
Date:	Wed, 14 May 2014 12:16:47 +0100
From:	Grant Likely <grant.likely@...aro.org>
To:	"Jon Medhurst (Tixy)" <tixy@...aro.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	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, Mark Rutland <mark.rutland@....com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Pawel Moll <pawel.moll@....com>, Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Will Deacon <will.deacon@....com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Marc <marc.ceeeee@...il.com>,
	Nishanth Peethambaran <nishanth.p@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Olof Johansson <olof@...om.net>,
	Ian Campbell <ian.campbell@...rix.com>,
	Josh Cartwright <joshc@...eaurora.org>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: Re: [PATCH v6 05/11] drivers: of: add automated assignment of
 reserved regions to client devices

On Wed, 14 May 2014 10:15:38 +0100, "Jon Medhurst (Tixy)" <tixy@...aro.org> wrote:
> On Sun, 2014-03-02 at 13:40 +0800, Grant Likely wrote:
> > On Fri, 28 Feb 2014 14:42:50 +0100, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
> > > This patch adds code for automated assignment of reserved memory regions
> > > to struct device. reserved_mem->ops->device_init()/device_cleanup()
> > > callbacks are called to perform reserved memory driver specific
> > > initialization and cleanup
> > > 
> > > Based on previous code provided by Josh Cartwright <joshc@...eaurora.org>
> > > 
> > > Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> > 
> > Hi Marek,
> > 
> > I've not applied this one yet, only because there is still the open
> > issue of whether or not these functions should be called from drivers or
> > from core code. I don't actually have any problems with the content of
> > this patch. Once the user is sorted out I'll merge it.
> 
> Has anything more come of these patches? I see some of the series is now
> in Linux 3.15, but the actual patches to let people use the feature
> aren't there yet, namely patches 5 though 8.
> 
> My personal immediate interest in these is as a mechanism on arm64 to
> limit CMA to a region of memory that is actually DMA-able devices (e.g.
> below 4GB for 32-bit devices without an iommu).
> 
> For reference, the mail archives for this series is at
> http://lkml.org/lkml/2014/2/28/237

IIRC, the issue I have with patch 5-8 is that I don't like the driver core
going off and doing automagical things to attach regions to devices.
I've not seen any more discussion on this topic since I merged the
patches I was okay with, but I may have missed something.

g.

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