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    Subject[PATCH v4 2/3] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
    Date
    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>
    ---
    v3: Add comments
    ---
    kernel/dma/Kconfig | 7 +++++++
    kernel/dma/mapping.c | 2 +-
    2 files changed, 8 insertions(+), 1 deletion(-)

    diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
    index 56866aaa2ae1..6677d0e64d27 100644
    --- a/kernel/dma/Kconfig
    +++ b/kernel/dma/Kconfig
    @@ -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
    diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
    index 80f9663ffe26..9a4db5cce600 100644
    --- a/kernel/dma/mapping.c
    +++ b/kernel/dma/mapping.c
    @@ -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

    /*
    --
    2.39.2 (Apple Git-143)
    \
     
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