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Tue, 21 Mar 2023 07:08:28 -0400 (EDT) From: Jiaxun Yang To: linux-mips@vger.kernel.org Subject: [PATCH v3 3/4] dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT Date: Tue, 21 Mar 2023 11:08:12 +0000 Message-Id: <20230321110813.26808-4-jiaxun.yang@flygoat.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) In-Reply-To: <20230321110813.26808-1-jiaxun.yang@flygoat.com> References: <20230321110813.26808-1-jiaxun.yang@flygoat.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tsbogend@alpha.franken.de, linux-kernel@vger.kernel.org, Jiaxun Yang , 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 Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Provide a kconfig option to allow arches to manipulate default value of dma_default_coherent in Kconfig. Signed-off-by: Jiaxun Yang --- 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 /*