[PATCH v4 0/7] reserved-memory regions/CMA in devicetree, again

[Marek Szyprowski]

Hi all!

This is another quick update of the patches which add basic support for
dynamic allocation of memory reserved regions defined in device tree.

This time I hope I've really managed to address all the issues reported
by Grant Likely, see the change log for more details. As a bonus, I've
added support for ARM64 and PowerPC, as those architectures had quite
well defined place where early memory reservation can be done.

The initial code for this feature were posted here [1], merged as commit
9d8eab7af79cb4ce2de5de39f82c455b1f796963 ("drivers: of: add
initialization code for dma reserved memory") and later reverted by
commit 1931ee143b0ab72924944bc06e363d837ba05063. For more information,
see [2]. Finally a new bindings has been proposed [3] and Josh
Cartwright a few days ago prepared some code which implements those
bindings [4]. This finally pushed me again to find some time to finish
this task and review the code. Josh agreed to give me the ownership of
this series to continue preparing them for mainline inclusion.

For more information please refer to the changlelog below.

[1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@samsung.com
[2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@samsung.com
[3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca
[4]: http://thread.gmane.org/gmane.linux.documentation/19579

Changelog:

v4:
- dynamic allocations are processed after all static reservations has been
  done
- moved code for handling static reservations to drivers/of/fdt.c
- removed node matching by string comparison, now phandle values are used
  directly
- moved code for DMA and CMA handling directly to
  drivers/base/dma-{coherent,contiguous}.c
- added checks for proper #size-cells, #address-cells, ranges properties
  in /reserved-memory node
- even more code cleanup
- added init code for ARM64 and PowerPC

v3: http://article.gmane.org/gmane.linux.documentation/20169/
- refactored memory reservation code, created common code to parse reg, size,
  align, alloc-ranges properties
- added support for multiple tuples in 'reg' property
- memory is reserved regardless of presence of the driver for its compatible
- prepared arch specific hooks for memory reservation (defaults use memblock
  calls)
- removed node matching by string during device initialization
- CMA init code: added checks for required region alignment
- more code cleanup here and there

v2: http://thread.gmane.org/gmane.linux.documentation/19870/
- removed copying of the node name
- split shared-dma-pool handling into separate files (one for CMA and one
  for dma_declare_coherent based implementations) for making the code easier
  to understand
- added support for AMBA devices, changed prototypes to use struct decice
  instead of struct platform_device
- renamed some functions to better match other names used in drivers/of/
- restructured the rest of the code a bit for better readability
- added 'reusable' property to exmaple linux,cma node in documentation
- exclusive dma (dma_coherent) is used for only handling 'shared-dma-pool'
  regions without 'reusable' property and CMA is used only for handling
  'shared-dma-pool' regions with 'reusable' property.

v1: http://thread.gmane.org/gmane.linux.documentation/19579
- initial version prepared by Josh Cartwright

Summary:

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

Marek Szyprowski (6):
  drivers: of: add initialization code for reserved memory
  drivers: dma-coherent: add initialization from device tree
  drivers: dma-contiguous: add initialization from device tree
  arm: add support for reserved memory defined by device tree
  arm64: add support for reserved memory defined by device tree
  powerpc: add support for reserved memory defined by device tree

 .../bindings/reserved-memory/reserved-memory.txt   |  138 +++++++++
 arch/arm/Kconfig                                   |    1 +
 arch/arm/mm/init.c                                 |    3 +
 arch/arm64/Kconfig                                 |    1 +
 arch/arm64/mm/init.c                               |    2 +
 arch/powerpc/Kconfig                               |    1 +
 arch/powerpc/kernel/prom.c                         |    3 +
 drivers/base/dma-coherent.c                        |   41 +++
 drivers/base/dma-contiguous.c                      |  130 +++++++--
 drivers/of/Kconfig                                 |    6 +
 drivers/of/Makefile                                |    1 +
 drivers/of/fdt.c                                   |  145 ++++++++++
 drivers/of/of_reserved_mem.c                       |  296 ++++++++++++++++++++
 drivers/of/platform.c                              |    7 +
 include/asm-generic/vmlinux.lds.h                  |   11 +
 include/linux/of_reserved_mem.h                    |   65 +++++
 16 files changed, 829 insertions(+), 22 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt
 create mode 100644 drivers/of/of_reserved_mem.c
 create mode 100644 include/linux/of_reserved_mem.h

-- 
1.7.9.5