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dma-remap: separate DMA atomic pools from direct remap code

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DMA atomic pools will be needed beyond only CONFIG_DMA_DIRECT_REMAP so
separate them out into their own file.

This also adds a new Kconfig option that can be subsequently used for
options, such as CONFIG_AMD_MEM_ENCRYPT, that will utilize the coherent
pools but do not have a dependency on direct remapping.

For this patch alone, there is no functional change introduced.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Rientjes <rientjes@google.com>
[hch: fixup copyrights and remove unused includes]
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
David Rientjes
2020-04-14 17:04:52 -07:00
committed by Christoph Hellwig
parent 05f099a7d0
commit e860c299ac
4 changed files with 130 additions and 121 deletions
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6
kernel/dma/Kconfig
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@@ -79,10 +79,14 @@ config DMA_REMAP
select DMA_NONCOHERENT_MMAP
bool
config DMA_DIRECT_REMAP
config DMA_COHERENT_POOL
bool
select DMA_REMAP
config DMA_DIRECT_REMAP
bool
select DMA_COHERENT_POOL
config DMA_CMA
bool "DMA Contiguous Memory Allocator"
depends on HAVE_DMA_CONTIGUOUS && CMA