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ARM: integrate CMA with DMA-mapping subsystem

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This patch adds support for CMA to dma-mapping subsystem for ARM
architecture. By default a global CMA area is used, but specific devices
are allowed to have their private memory areas if required (they can be
created with dma_declare_contiguous() function during board
initialisation).

Contiguous memory areas reserved for DMA are remapped with 2-level page
tables on boot. Once a buffer is requested, a low memory kernel mapping
is updated to to match requested memory access type.

GFP_ATOMIC allocations are performed from special pool which is created
early during boot. This way remapping page attributes is not needed on
allocation time.

CMA has been enabled unconditionally for ARMv6+ systems.

Signed-off-by: Marek Szyprowski <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
CC: Michal Nazarewicz <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Tested-by: Rob Clark <[email protected]>
Tested-by: Ohad Ben-Cohen <[email protected]>
Tested-by: Benjamin Gaignard <[email protected]>
Tested-by: Robert Nelson <[email protected]>
Tested-by: Barry Song <[email protected]>
This commit is contained in:
Marek Szyprowski 2011-12-29 13:09:51 +01:00
commit c790950928
9 changed files with 370 additions and 88 deletions
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4
Documentation/kernel-parameters.txt
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@ -520,6 +520,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
a hypervisor.
Default: yes
coherent_pool=nn[KMG] [ARM,KNL]
Sets the size of memory pool for coherent, atomic dma
allocations if Contiguous Memory Allocator (CMA) is used.
code_bytes [X86] How many bytes of object code to print
in an oops report.
Range: 0 - 8192