linux-kernel - Re: [PATCH v2 0/3] CMA & device tree, another approach

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Date:	Tue, 23 Sep 2014 10:05:36 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-mm-sig@...ts.linaro.org, Arnd Bergmann <arnd@...db.de>,
	Michal Nazarewicz <mina86@...a86.com>,
	Grant Likely <grant.likely@...aro.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Josh Cartwright <joshc@...eaurora.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Kyungmin Park <kyungmin.park@...sung.com>
Subject: Re: [PATCH v2 0/3] CMA & device tree, another approach

Hi Andrew,

On 2014-09-11 13:22, Marek Szyprowski wrote:
> Hello,
>
> This is another approach to finish support for reserved memory regions
> defined in device tree. Previous attempts
> (http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html
> and https://lkml.org/lkml/2014/7/14/108) ended in merging parts of the
> code and documentation. Merged patches allow to reserve memory, but
> there is still no reserved memory drivers nor any code that actually
> uses reserved memory regions.
>
> The final conclusion from the above mentioned threads is that there is
> no automated reserved memory initialization. All drivers that want to
> use reserved memory, should initialize it on their own.
>
> This patch series provides two driver for reserved memory regions (one
> based on CMA and one based on dma_coherent allocator). The main
> improvement comparing to the previous version is removal of automated
> reserved memory for every device and support for named memory regions.
>
> Those patches are for merging, rebased on top of recent linux-next tree.

Andrew: could you take those patches to your "next" branch together with
other CMA-related changes that are already there?

> Best regards
> Marek Szyprowski
> Samsung R&D Institute Poland
>
> Changes since v1 (https://lkml.org/lkml/2014/8/26/339):
> - removed patches for named reserved regions - they will be discussed
>    separately
> - added a check for 'no-map' property to dma coherent allocator
>    (suggested by Laura Abbott)
> - removed example code for s5p-mfc driver
>
> Changes since '[PATCH v2 RESEND 0/4] CMA & device tree, once again' version:
> (https://lkml.org/lkml/2014/7/14/108)
> - added return error value to of_reserved_mem_device_init()
> - added support for named memory regions (so more than one region can be
>    defined per device)
> - added usage example - converted custom reserved memory code used by
>    s5p-mfc driver to the generic reserved memory handling code
>
> Patch summary:
>
> Marek Szyprowski (3):
>    drivers: of: add return value to of_reserved_mem_device_init
>    drivers: dma-coherent: add initialization from device tree
>    drivers: dma-contiguous: add initialization from device tree
>
>   drivers/base/dma-coherent.c     | 145 ++++++++++++++++++++++++++++++++++------
>   drivers/base/dma-contiguous.c   |  71 ++++++++++++++++++++
>   drivers/of/of_reserved_mem.c    |   3 +-
>   include/linux/cma.h             |   3 +
>   include/linux/of_reserved_mem.h |   9 ++-
>   mm/cma.c                        |  62 ++++++++++++++---
>   6 files changed, 259 insertions(+), 34 deletions(-)
>

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland

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