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Wed, 5 Feb 2025 14:41:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738766482; bh=h/yBzjhoClTiKMl8LmMlOxeyuG0iINYdLuYFXO+3beM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EQyxrQTbpGC5ELIJR6leSqpKifyAyAeb8I25BfLUz1ZlNtPRHHXvoAx88ZmrkyhEj oiWitEtgqYTOWTpFkQbSoNIgY697J6MH3fgUibpLubW6kyqypRIhWVHQGweM5VjovX Y1kC2pXK7i3BJenUde3znE6Y9+xI1LxPrSgIzVCpeRFAFE2Mk+Y2KOQSzJRqpjmsik lZLP6NauWc5PCH6knOGMgYGQ2xZ4Jq10wd5UPj6rUnemzBirIatwxYpFvbihAfjv4l iAoBLOEQbRc5Y/oScO3iFxYYMiLToSeN6xqr8mVzjSijcHqG6FQdSWfyW/ezi5a2FL 0IJKIrd4mwf4A== From: Leon Romanovsky To: Christoph Hellwig , Jason Gunthorpe , Robin Murphy Cc: Jens Axboe , Joerg Roedel , Will Deacon , Sagi Grimberg , Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , Jonathan Corbet , 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, Randy Dunlap Subject: [PATCH v7 08/17] dma-mapping: add a dma_need_unmap helper Date: Wed, 5 Feb 2025 16:40:28 +0200 Message-ID: <6c134d9e273433c52ca406de30112ecbc13f3b88.1738765879.git.leonro@nvidia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: MIME-Version: 1.0 X-Rspamd-Queue-Id: 873752000B X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: agya5dnmyew3c4fq3kx963t3mbrnxgd7 X-HE-Tag: 1738766483-672833 X-HE-Meta: U2FsdGVkX1+ORowxVaeYs2e0QW16iDzmbOCjEp/AjSWqUxSZWVMfQFYWKme64woGe9oMTZPEvB0962V8V9X5RDY1bJVR9rsm0Av26b5qLYOn0F8lsw37rpH/4gR1rvq9G2gNO6XaS0+d73oM08w9mHG/eb9uwFWIDZtSIax/N57WbnUUvK9Eu0YMlh/jh1NCrzBvwuFL11DZOYrrW1rhicdYS9LopkiO2lfgjEK+CFYg+Fg2rCeG7YJqpQntblhhBZfe+YC0+4QKNsiRKtjV217+XIjxKZZ6NiPMmsNN5aXmM12Kuh5CoaYQj+PkzZCxJLqW+pcWwyOlV7uKh/uaAhBDU/kuel5+mEFWZ5WJJZK1y1y5emeVUjT/9XifrkrZe2Ek/lDOEZMuRXBSxreAy0cj9QmWRHKEHvzQLr9BbjH0uNMwkMmu6Jwnu1yheyvDuThjmTMqMzI+3fVU2R2pifT4399OcpfrG9vOeiMpNF5ilZwZVXVvodi5GawC2flYDp0jm9eyBa5kgr8WfjqeQ26l7GpIIZqd6NzvS/aamggxJH2BW5WNxPKb+DRDnW9H5DgZet2ZBMNCF3hwrEjQA7cqEvKEeVNjHe5cMjBYf8opo26HNK2AFQKZqT65SMfli3oX70O2Y50/6DuF9jyXTb+a1SPZvHvH2i5/0tQi4cOPA9YyV08WiP4bbiQCfLscQrcHPPzui61dT7GfFNz6b8Rz+kGsd+w2dc+MnhAXfV7T/dILyoMRbx2vNySF/8eHym57q5Dq4HP50AVisuMqtP64xUe+Tg6kvJ+4SQp+qEVf8C84Wy5+AGNPztFGk4eLFvHDTqqGGenJo0zaPvI+dxQ6JrISNWeEo0YV/KHWbifxwm4ThaESy/bfYmEGadoG59r/FWMwE7xTaGlieZsYtCZ3l4OsrhloxClEHpMKrJN/XThX8hwpicHJHWBRwAmwPDlWcABa0Vca90brRhN ZR2Cow0G tgS2bJFLmJyoeG6CjfOGkOZ5P6WHAghjoMs4zGDS4lYJJK+zjVogNOmdCckX4/Cy9xx0KDihL9lpojtzaLa6BM8NKGyoPjEO668vVO2/UwDxXCXEKXj4pxI8ctZ405ysodETvWEu/WKZN+SAVKW6gIWA7O6tyh5Eig4tXv+kFuoQrRvJRrXr73g/O0oVKF7JTU8g4zE+dY1Q5/5WJAEbj3dnMvsuzlfqFg6v8OzN5mWgvYmm9LKJv8xTwpA== 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);