linux-kernel - [PATCH v4 2/3] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT

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Message-Id: <20230401091531.47412-3-jiaxun.yang@flygoat.com>
Date:   Sat,  1 Apr 2023 10:15:30 +0100
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     iommu@...ts.linux.dev
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, tsbogend@...ha.franken.de,
        mpe@...erman.id.au, paul.walmsley@...ive.com, palmer@...belt.com,
        robh+dt@...nel.org, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, linux-riscv@...ts.infradead.org,
        devicetree@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v4 2/3] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT

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

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.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)