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b=qqtM0p4gWP9l89f4xe03WY9yh8S81jdJOy9cNmMjR+Mi9fNCGSmR3SKl9rQnAZ6HK ifaZF9J3ukpYGHCWk8qbzAYHobwBSK6ZPE9c8zYYX98JeidbQ7xvgllEiqhKw0HOpM dzM7fO8tAGhd7WaF/P3BocqEX/LTe/YP3sRfSN9JLTsTIeDn2vlwVi/rBP3xpLyLA0 Hfk7nonUdMRXWPDCOVNaRXYIZ29to9Zuf/kf5xo6D/n5im+HZTPVbVJ8h8oioMZnvc WaFLtd5J2lafRtA3roO1fRn3KaNxX7b0rzVH9A9CgLTev2i9azW/8Bo4QESW8C3baq DP06qo478a2iw== From: Leon Romanovsky To: Cc: Christoph Hellwig , Jens Axboe , Keith Busch , Jake Edge , Jonathan Corbet , Jason Gunthorpe , Zhu Yanjun , Robin Murphy , Joerg Roedel , Will Deacon , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Andrew Morton , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, Niklas Schnelle , Chuck Lever , Luis Chamberlain , Matthew Wilcox , Dan Williams , Kanchan Joshi , Chaitanya Kulkarni , Leon Romanovsky Subject: [PATCH v11 8/9] dma-mapping: add a dma_need_unmap helper Date: Mon, 5 May 2025 10:01:45 +0300 Message-ID: <11ca5400460fa195692bd413387b06ac484e03b4.1746424934.git.leon@kernel.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 08947120002 X-Rspam-User: X-Stat-Signature: 7jcd9jorxmhgadskny4dqkccw1uq6csh X-HE-Tag: 1746428550-342819 X-HE-Meta: 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 74X21XrX M3XS7MjhOAQtIIZLJtsP0fyosb3prq99gOlYelmRhZAaAqyCyNukyiqxoYEdOKCMjfxZBhr0yhC8W8JdWpSrZkbzMBCXDjH0eJFFtPj+5LiRGvSFT0mnmbhhn9uh9Sp3jppJV/W7xhAIHsnPdhZzbmeylL6T4QT2zfeKvRVoqEmDK3fmodfUaEHk+A9SiLzpBoUXSy6aFiDLSM/EBue+EFDMiYzhZv9DOY+2iojG/6nJntFYLkJTXbPeA5sgeDWc3NjgHELcEuG5YkR6lT9fGtuYAr2YWuBfU60BHpqu2HuG0MWNdgT6LGXXR9Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Christoph Hellwig Add helper that allows a driver to skip calling dma_unmap_* if the DMA layer can guarantee that they are no-nops. Signed-off-by: Christoph Hellwig Tested-by: Jens Axboe Reviewed-by: Luis Chamberlain Signed-off-by: Leon Romanovsky --- include/linux/dma-mapping.h | 5 +++++ kernel/dma/mapping.c | 18 ++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index a71e110f1e9d..d2f358c5a25d 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -406,6 +406,7 @@ static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { return dma_dev_need_sync(dev) ? __dma_need_sync(dev, dma_addr) : false; } +bool dma_need_unmap(struct device *dev); #else /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ static inline bool dma_dev_need_sync(const struct device *dev) { @@ -431,6 +432,10 @@ static inline bool dma_need_sync(struct device *dev, dma_addr_t dma_addr) { return false; } +static inline bool dma_need_unmap(struct device *dev) +{ + return false; +} #endif /* !CONFIG_HAS_DMA || !CONFIG_DMA_NEED_SYNC */ struct page *dma_alloc_pages(struct device *dev, size_t size, diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index cda127027e48..3c3204ad2839 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -443,6 +443,24 @@ bool __dma_need_sync(struct device *dev, dma_addr_t dma_addr) } EXPORT_SYMBOL_GPL(__dma_need_sync); +/** + * dma_need_unmap - does this device need dma_unmap_* operations + * @dev: device to check + * + * If this function returns %false, drivers can skip calling dma_unmap_* after + * finishing an I/O. This function must be called after all mappings that might + * need to be unmapped have been performed. + */ +bool dma_need_unmap(struct device *dev) +{ + if (!dma_map_direct(dev, get_dma_ops(dev))) + return true; + if (!dev->dma_skip_sync) + return true; + return IS_ENABLED(CONFIG_DMA_API_DEBUG); +} +EXPORT_SYMBOL_GPL(dma_need_unmap); + static void dma_setup_need_sync(struct device *dev) { const struct dma_map_ops *ops = get_dma_ops(dev); -- 2.49.0