Hi all!
This is yet another update of the second attempt to add basic support for dynamic allocation of memory reserved regions defined in device tree.
This time I've tried to address all the issues reported by Grant Likely. The side-effect of it is a complete rewrite of memory reservation code, which results in added support for for multiple tuples in 'reg' property and complete support for 'size', 'align' and 'alloc-ranges' properties.
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@samsu... [2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@sams... [3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca [4]: http://thread.gmane.org/gmane.linux.documentation/19579
Changelog:
v3: - 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
Josh Cartwright (2): drivers: of: implement reserved-memory handling for dma drivers: of: implement reserved-memory handling for cma
Marek Szyprowski (3): base: dma-contiguous: add dma_contiguous_init_reserved_mem() function 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 | 138 +++++++ arch/arm/Kconfig | 1 + arch/arm/mm/init.c | 3 + drivers/base/dma-contiguous.c | 70 ++-- drivers/of/Kconfig | 19 + drivers/of/Makefile | 3 + drivers/of/fdt.c | 2 + drivers/of/of_reserved_mem.c | 390 ++++++++++++++++++++ drivers/of/of_reserved_mem_cma.c | 68 ++++ drivers/of/of_reserved_mem_dma.c | 65 ++++ drivers/of/platform.c | 7 + include/asm-generic/vmlinux.lds.h | 11 + include/linux/dma-contiguous.h | 7 + include/linux/of_reserved_mem.h | 65 ++++ 14 files changed, 827 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 drivers/of/of_reserved_mem_cma.c create mode 100644 drivers/of/of_reserved_mem_dma.c create mode 100644 include/linux/of_reserved_mem.h