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dma-direct: provide generic support for uncached kernel segments

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A few architectures support uncached kernel segments.  In that case we get
an uncached mapping for a given physica address by using an offset in the
uncached segement.  Implement support for this scheme in the generic
dma-direct code instead of duplicating it in arch hooks.

Signed-off-by: Christoph Hellwig <[email protected]>
This commit is contained in:
Christoph Hellwig 2019-06-03 08:43:51 +02:00
commit c30700db9e
3 changed files with 26 additions and 2 deletions
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8
arch/Kconfig
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@ -260,6 +260,14 @@ config ARCH_HAS_SET_MEMORY
config ARCH_HAS_SET_DIRECT_MAP
bool
#
# Select if arch has an uncached kernel segment and provides the
# uncached_kernel_address / cached_kernel_address symbols to use it
#
config ARCH_HAS_UNCACHED_SEGMENT
select ARCH_HAS_DMA_PREP_COHERENT
bool
# Select if arch init_task must go in the __init_task_data section
config ARCH_TASK_STRUCT_ON_STACK
bool