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swiotlb: move the SWIOTLB config symbol to lib/Kconfig

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This way we have one central definition of it, and user can select it as
needed.  The new option is not user visible, which is the behavior
it had in most architectures, with a few notable exceptions:

 - On x86_64 and mips/loongson3 it used to be user selectable, but
   defaulted to y.  It now is unconditional, which seems like the right
   thing for 64-bit architectures without guaranteed availablity of
   IOMMUs.
 - on powerpc the symbol is user selectable and defaults to n, but
   many boards select it.  This change assumes no working setup
   required a manual selection, but if that turned out to be wrong
   we'll have to add another select statement or two for the respective
   boards.

Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Christoph Hellwig 2018-04-24 09:00:54 +02:00
commit 09230cbc1b
11 changed files with 10 additions and 49 deletions
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5
lib/Kconfig
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@ -451,6 +451,11 @@ config DMA_VIRT_OPS
depends on HAS_DMA && (!64BIT || ARCH_DMA_ADDR_T_64BIT)
default n
config SWIOTLB
bool
select DMA_DIRECT_OPS
select NEED_DMA_MAP_STATE
config CHECK_SIGNATURE
bool