[PATCH RFC 0/4] reserved-memory regions/CMA in devicetree, again

From: Josh Cartwright
Date: Wed Jan 22 2014 - 14:02:06 EST

Hey Marek-

What is the current status of the reserved-memory/CMA device tree support
series? It looks like it's stalled out a bit since the revert[2]. Hopefully
this series is a push in the right direction?

This set is an adaptation of Marek's original patchset posted here[1],
and then subsequently reverted here[2]. In [3], Grant proposed a new
set of bindings after discussion in Edinburgh.

This is a partially complete implementation of these proposed bindings.

It's functionality is now split into two pieces, the first of which
implements a default/fallback behavior for reserved-memory nodes; that
is, reserved memory nodes describing fixed-address static regions will
be unconditionally reserved, regardless of their intended use. In
addition, it provides an interface for adding additional reserved-memory
types, using a method similar to CLOCKSOURCE_OF_DECLARE().

The second piece uses the above method to provide support for
reserved-memory nodes whose compatible = "shared-dma-pool". It makes
use of CMA when available, and when a describing node has the 'reusable'

There is basic support for dynamic allocation of memory reserved
regions, however, noticeably missing is support for additional
restrictions (use of alignment and alloc-ranges properties).

[1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@xxxxxxxxxxx
[2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@xxxxxxxxxxx
[3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@xxxxxxxxxxxxxxxxxxx

Grant Likely (1):
of: document bindings for reserved-memory nodes

Josh Cartwright (1):
drivers: of: implement reserved-memory handling for dma

Marek Szyprowski (2):
drivers: of: add initialization code for reserved memory
ARM: init: add support for reserved memory defined by device tree

.../bindings/reserved-memory/reserved-memory.txt | 137 +++++++++++++++
arch/arm/mm/init.c | 3 +
drivers/of/Kconfig | 13 ++
drivers/of/Makefile | 2 +
drivers/of/of_reserved_mem.c | 188 +++++++++++++++++++++
drivers/of/of_reserved_mem_dma.c | 178 +++++++++++++++++++
drivers/of/platform.c | 4 +
include/asm-generic/vmlinux.lds.h | 11 ++
include/linux/of_reserved_mem.h | 61 +++++++
9 files changed, 597 insertions(+)
create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
create mode 100644 drivers/of/of_reserved_mem.c
create mode 100644 drivers/of/of_reserved_mem_dma.c
create mode 100644 include/linux/of_reserved_mem.h

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