From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: iommu@lists.linux.dev
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, tsbogend@alpha.franken.de,
mpe@ellerman.id.au, paul.walmsley@sifive.com, palmer@dabbelt.com,
robh+dt@kernel.org, hch@lst.de, m.szyprowski@samsung.com,
robin.murphy@arm.com, linux-riscv@lists.infradead.org,
devicetree@vger.kernel.org, Jiaxun Yang <jiaxun.yang@flygoat.com>
Subject: [PATCH v4 2/3] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
Date: Sat, 1 Apr 2023 10:15:30 +0100 [thread overview]
Message-ID: <20230401091531.47412-3-jiaxun.yang@flygoat.com> (raw)
In-Reply-To: <20230401091531.47412-1-jiaxun.yang@flygoat.com>
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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next prev parent reply other threads:[~2023-04-01 9:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-01 9:15 [PATCH v4 0/3] Use dma_default_coherent for devicetree default coherency Jiaxun Yang
2023-04-01 9:15 ` [PATCH v4 1/3] dma-mapping: Provide a fallback dma_default_coherent Jiaxun Yang
2023-04-01 9:15 ` Jiaxun Yang [this message]
2023-04-01 9:15 ` [PATCH v4 3/3] of: address: Always use dma_default_coherent for default coherency Jiaxun Yang
2023-04-06 7:12 ` [PATCH v4 0/3] Use dma_default_coherent for devicetree " Jiaxun Yang
2023-04-07 5:39 ` Christoph Hellwig
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