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Fri, 18 Apr 2025 06:48:12 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 603A4C4CEE2; Fri, 18 Apr 2025 06:48:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744958911; bh=yOniWqL++YZaDfzZaCSY7YnTRY/fJoU6UIBB3ZlAGj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LvCJYaeRT0QT6JHX0IAof9Jay3VLFlYiNVXchwWQlDG3b9bpLSac4tbtBXc0Zk88H qp0FtM1F1yBnANGawmZrgkzKr/bYmbidWLdJQtkpUAteaG5zDXBPtg/CxN6ULVp1eH qs7JCn8d25pjuqWWp91BPyfLyM9k57DE0MxBWwlcvCrt7AIhjoFgB6DHYhfEbp0oj8 2UWG1Dc0sN4ZCcrQVfjCuUlEgSHyMLg3UjMw+FxCEVGsf1wIo/Tv626CydZ4SYbbKf P549WLYT8Q6Mn20f9YqwNR02jCCbrj2uepZSXRloxB1s6NUfBV19UaRpkfh2s5qQ7/ Q3EjrOrFMKz7w== From: Leon Romanovsky To: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch Cc: 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?b?SsOpcsO0bWUgR2xp?= =?utf-8?b?c3Nl?= , 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 v8 08/24] dma-mapping: add a dma_need_unmap helper Date: Fri, 18 Apr 2025 09:47:38 +0300 Message-ID: X-Mailer: git-send-email 2.49.0 In-Reply-To: References: MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 013FDC000A X-Stat-Signature: do89wpqm4okg9o145aoem3t77krak53q X-Rspam-User: X-HE-Tag: 1744958911-968547 X-HE-Meta: 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 aPCZ0pCA bcf4x1qehKnVyFU/hmPAa4/zRB+U3M/7tH+xzCn5Xys0htJ3Lb/aT8dAdN/4qTVWzn+v3AzAmWGBEktVLH89Efkoh07Vb85E8nI0dwBhODxcGHFtCKfBhqsO8DIKVQOjZGpD4npeyrkUp+D1TkIT1eq2Ox4Y2+VshSa4iAs+mT+2S/CvLA3jKTahP9y0WMFoFKc/urh0Y0Vm2e2q309iMXROQnfz/zwmVk/0HUmiAQTA6/lxNmIhroPM7zbLVOhX1HQ5lSfi04IejiQ65wNjD4YF3mA== 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 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);