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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2011-12-29 13:09:51 +0100 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-05-21 15:09:38 +0200 |
| commit | c79095092834a18ae74cfc08def1a5a101dc106c (patch) | |
| tree | c6cd81c38b92dcdb269288ab9a125bc13f4bb339 /arch/arm/Kconfig | |
| parent | X86: integrate CMA with DMA-mapping subsystem (diff) | |
| download | linux-c79095092834a18ae74cfc08def1a5a101dc106c.tar.xz linux-c79095092834a18ae74cfc08def1a5a101dc106c.zip | |
ARM: integrate CMA with DMA-mapping subsystem
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 <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
CC: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Tested-by: Rob Clark <rob.clark@linaro.org>
Tested-by: Ohad Ben-Cohen <ohad@wizery.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
Tested-by: Barry Song <Baohua.Song@csr.com>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 36586dba6fa6..cbbbc45f6b67 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -4,6 +4,8 @@ config ARM select HAVE_AOUT select HAVE_DMA_API_DEBUG select HAVE_IDE if PCI || ISA || PCMCIA + select HAVE_DMA_CONTIGUOUS if (CPU_V6 || CPU_V6K || CPU_V7) + select CMA if (CPU_V6 || CPU_V6K || CPU_V7) select HAVE_MEMBLOCK select RTC_LIB select SYS_SUPPORTS_APM_EMULATION |