[PATCH v3 3/4] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
From: Jiaxun Yang <jiaxun.yang@flygoat.com>
Date: 2023-03-21 11:09:35
Also in:
linux-mips, linux-riscv, lkml
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
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 /*
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