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Commit ddb26d8e authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

dma-mapping: move CONFIG_DMA_CMA to kernel/dma/Kconfig 



This is where all the related code already lives.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ff4c25f2

drivers/base/Kconfig

+0 −77
Original line number Diff line number Diff line
@@ -191,83 +191,6 @@ config DMA_FENCE_TRACE 
	  lockup related problems for dma-buffers shared across multiple

	  devices.



config DMA_CMA

	bool "DMA Contiguous Memory Allocator"

	depends on HAVE_DMA_CONTIGUOUS && CMA

	help

	  This enables the Contiguous Memory Allocator which allows drivers

	  to allocate big physically-contiguous blocks of memory for use with

	  hardware components that do not support I/O map nor scatter-gather.



	  You can disable CMA by specifying "cma=0" on the kernel's command

	  line.



	  For more information see <include/linux/dma-contiguous.h>.

	  If unsure, say "n".



if  DMA_CMA

comment "Default contiguous memory area size:"



config CMA_SIZE_MBYTES

	int "Size in Mega Bytes"

	depends on !CMA_SIZE_SEL_PERCENTAGE

	default 0 if X86

	default 16

	help

	  Defines the size (in MiB) of the default memory area for Contiguous

	  Memory Allocator.  If the size of 0 is selected, CMA is disabled by

	  default, but it can be enabled by passing cma=size[MG] to the kernel.





config CMA_SIZE_PERCENTAGE

	int "Percentage of total memory"

	depends on !CMA_SIZE_SEL_MBYTES

	default 0 if X86

	default 10

	help

	  Defines the size of the default memory area for Contiguous Memory

	  Allocator as a percentage of the total memory in the system.

	  If 0 percent is selected, CMA is disabled by default, but it can be

	  enabled by passing cma=size[MG] to the kernel.



choice

	prompt "Selected region size"

	default CMA_SIZE_SEL_MBYTES



config CMA_SIZE_SEL_MBYTES

	bool "Use mega bytes value only"



config CMA_SIZE_SEL_PERCENTAGE

	bool "Use percentage value only"



config CMA_SIZE_SEL_MIN

	bool "Use lower value (minimum)"



config CMA_SIZE_SEL_MAX

	bool "Use higher value (maximum)"



endchoice



config CMA_ALIGNMENT

	int "Maximum PAGE_SIZE order of alignment for contiguous buffers"

	range 4 12

	default 8

	help

	  DMA mapping framework by default aligns all buffers to the smallest

	  PAGE_SIZE order which is greater than or equal to the requested buffer

	  size. This works well for buffers up to a few hundreds kilobytes, but

	  for larger buffers it just a memory waste. With this parameter you can

	  specify the maximum PAGE_SIZE order for contiguous buffers. Larger

	  buffers will be aligned only to this specified order. The order is

	  expressed as a power of two multiplied by the PAGE_SIZE.



	  For example, if your system defaults to 4KiB pages, the order value

	  of 8 means that the buffers will be aligned up to 1MiB only.



	  If unsure, leave the default value "8".



endif



config GENERIC_ARCH_TOPOLOGY

	bool

	help

kernel/dma/Kconfig

+77 −0
Original line number Diff line number Diff line
@@ -60,6 +60,83 @@ config DMA_DIRECT_REMAP 
	bool

	select DMA_REMAP



config DMA_CMA

	bool "DMA Contiguous Memory Allocator"

	depends on HAVE_DMA_CONTIGUOUS && CMA

	help

	  This enables the Contiguous Memory Allocator which allows drivers

	  to allocate big physically-contiguous blocks of memory for use with

	  hardware components that do not support I/O map nor scatter-gather.



	  You can disable CMA by specifying "cma=0" on the kernel's command

	  line.



	  For more information see <include/linux/dma-contiguous.h>.

	  If unsure, say "n".



if  DMA_CMA

comment "Default contiguous memory area size:"



config CMA_SIZE_MBYTES

	int "Size in Mega Bytes"

	depends on !CMA_SIZE_SEL_PERCENTAGE

	default 0 if X86

	default 16

	help

	  Defines the size (in MiB) of the default memory area for Contiguous

	  Memory Allocator.  If the size of 0 is selected, CMA is disabled by

	  default, but it can be enabled by passing cma=size[MG] to the kernel.





config CMA_SIZE_PERCENTAGE

	int "Percentage of total memory"

	depends on !CMA_SIZE_SEL_MBYTES

	default 0 if X86

	default 10

	help

	  Defines the size of the default memory area for Contiguous Memory

	  Allocator as a percentage of the total memory in the system.

	  If 0 percent is selected, CMA is disabled by default, but it can be

	  enabled by passing cma=size[MG] to the kernel.



choice

	prompt "Selected region size"

	default CMA_SIZE_SEL_MBYTES



config CMA_SIZE_SEL_MBYTES

	bool "Use mega bytes value only"



config CMA_SIZE_SEL_PERCENTAGE

	bool "Use percentage value only"



config CMA_SIZE_SEL_MIN

	bool "Use lower value (minimum)"



config CMA_SIZE_SEL_MAX

	bool "Use higher value (maximum)"



endchoice



config CMA_ALIGNMENT

	int "Maximum PAGE_SIZE order of alignment for contiguous buffers"

	range 4 12

	default 8

	help

	  DMA mapping framework by default aligns all buffers to the smallest

	  PAGE_SIZE order which is greater than or equal to the requested buffer

	  size. This works well for buffers up to a few hundreds kilobytes, but

	  for larger buffers it just a memory waste. With this parameter you can

	  specify the maximum PAGE_SIZE order for contiguous buffers. Larger

	  buffers will be aligned only to this specified order. The order is

	  expressed as a power of two multiplied by the PAGE_SIZE.



	  For example, if your system defaults to 4KiB pages, the order value

	  of 8 means that the buffers will be aligned up to 1MiB only.



	  If unsure, leave the default value "8".



endif



config DMA_API_DEBUG

	bool "Enable debugging of DMA-API usage"

	select NEED_DMA_MAP_STATE