From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: linux-mips@vger.kernel.org
Cc: tsbogend@alpha.franken.de, linux-kernel@vger.kernel.org,
Jiaxun Yang <jiaxun.yang@flygoat.com>,
robh+dt@kernel.org, palmer@dabbelt.com, paul.walmsley@sifive.com,
robin.murphy@arm.com, linux-riscv@lists.infradead.org,
linuxppc-dev@lists.ozlabs.org, hch@lst.de,
m.szyprowski@samsung.com
Subject: [PATCH v3 3/4] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
Date: Tue, 21 Mar 2023 11:08:12 +0000 [thread overview]
Message-ID: <20230321110813.26808-4-jiaxun.yang@flygoat.com> (raw)
In-Reply-To: <20230321110813.26808-1-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
/*
--
2.37.1 (Apple Git-137.1)
next prev parent reply other threads:[~2023-03-21 11:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-21 11:08 [PATCH v3 0/4] Use dma_default_coherent for devicetree default coherency Jiaxun Yang
2023-03-21 11:08 ` [PATCH v3 1/4] of: address: Fix default coherency for MIPS Jiaxun Yang
2023-03-28 14:15 ` Rob Herring
2023-03-21 11:08 ` [PATCH v3 2/4] dma-mapping: Provide a fallback dma_default_coherent Jiaxun Yang
2023-03-21 11:08 ` Jiaxun Yang [this message]
2023-03-21 11:08 ` [PATCH v3 4/4] of: address: Always use dma_default_coherent for default coherency Jiaxun Yang
2023-03-28 14:17 ` Rob Herring
2023-03-29 3:27 ` Michael Ellerman
2023-03-23 7:29 ` [PATCH v3 0/4] Use dma_default_coherent for devicetree " Christoph Hellwig
2023-03-23 21:07 ` Jiaxun Yang
2023-03-23 21:39 ` Christoph Hellwig
2023-03-24 9:17 ` Jiaxun Yang
2023-03-28 1:18 ` Christoph Hellwig
2023-03-28 7:45 ` Thomas Bogendoerfer
2023-03-28 13:02 ` Jiaxun Yang
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