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dma-mapping: provide CONFIG_ARCH_DMA_DEFAULT_COHERENT

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Provide a kconfig option to allow arches to manipulate default
value of dma_default_coherent in Kconfig.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Jiaxun Yang 2023-04-01 10:15:30 +01:00 committed by Christoph Hellwig
parent fe4e5efa40
commit 1d3f56b295
2 changed files with 8 additions and 1 deletions
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7
kernel/dma/Kconfig
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@ -76,6 +76,13 @@ config ARCH_HAS_DMA_PREP_COHERENT
config ARCH_HAS_FORCE_DMA_UNENCRYPTED
bool
#
# Select this option if the architecture assumes DMA devices are coherent
# by default.
#
config ARCH_DMA_DEFAULT_COHERENT
bool
config SWIOTLB
bool
select NEED_DMA_MAP_STATE

2
kernel/dma/mapping.c
View file

@ -20,7 +20,7 @@
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
bool dma_default_coherent;
bool dma_default_coherent = IS_ENABLED(CONFIG_ARCH_DMA_DEFAULT_COHERENT);
#endif
/*