From c79095092834a18ae74cfc08def1a5a101dc106c Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Thu, 29 Dec 2011 13:09:51 +0100 Subject: 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 Signed-off-by: Kyungmin Park CC: Michal Nazarewicz Acked-by: Arnd Bergmann Tested-by: Rob Clark Tested-by: Ohad Ben-Cohen Tested-by: Benjamin Gaignard Tested-by: Robert Nelson Tested-by: Barry Song --- arch/arm/include/asm/dma-contiguous.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 arch/arm/include/asm/dma-contiguous.h (limited to 'arch/arm/include/asm/dma-contiguous.h') diff --git a/arch/arm/include/asm/dma-contiguous.h b/arch/arm/include/asm/dma-contiguous.h new file mode 100644 index 000000000000..3ed37b4d93da --- /dev/null +++ b/arch/arm/include/asm/dma-contiguous.h @@ -0,0 +1,15 @@ +#ifndef ASMARM_DMA_CONTIGUOUS_H +#define ASMARM_DMA_CONTIGUOUS_H + +#ifdef __KERNEL__ +#ifdef CONFIG_CMA + +#include +#include + +void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size); + +#endif +#endif + +#endif -- cgit v1.2.3