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Fri, 18 Apr 2025 06:47:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80C09C4CEED; Fri, 18 Apr 2025 06:48:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744958896; bh=nlY3wEh3C1IEo+kSRhyetcCIxn/sZk9XJjHYh0zo1y8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uenu4mojsxkgpDo5apIoPvdB5TZ7+KyME7dRrsezlKFIzSNrqK0G6xnaj1lMmhtJg wJTNctFgkZizdGl1TqzRmL09k1+xz0tnpmPMjexc9xpeJvfDeuLQ4LYsQzlawKBCxB 1FZSP+CYslGLH9ayoD3ssQITRF4htPUkTw5R53V9MCsdAvWQAR+/usSZ7pXgH6Lk5d W6xt4cIXK16YUHoDSnZz+oSOqofM0WxvxEn9hm90qSpgE11qKEQVdipq46JN12PNH3 nvjN6kF40fxtXoDpCYfD1q6bh0Tb77gPByXyKgBr6e7PdcO1PZbRnLgjigChGvLqWP QFyBahGLt7GdQ== From: Leon Romanovsky To: Marek Szyprowski , Jens Axboe , Christoph Hellwig , Keith Busch Cc: Leon Romanovsky , 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 , Jason Gunthorpe Subject: [PATCH v8 04/24] iommu: add kernel-doc for iommu_unmap and iommu_unmap_fast Date: Fri, 18 Apr 2025 09:47:34 +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: 02D2DC0007 X-Stat-Signature: bhf14zwu6duq4w4tatnhbsarzooyiko6 X-Rspam-User: X-HE-Tag: 1744958896-959141 X-HE-Meta: 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 aHOqBJlM yQhyKv/jJgT5jw5cQncMxp5PAIpVch7Q5QiNa3saWPNxBJ6cJN5JItuAIZiYK5nRLJcxhjABMKha/JCAGjl6BzsOkkAl7assGz1lOtLKOx4rjdUinm3BiPoHikxgBo7W2Q+iej32jfxtS8icXvFWAqt6ouH+JF4CwNiieOXZprpCA+glOls1zkPaZ62+dqRO7U2XIB7wugGXoZEv3hmZ1BXDZARTtyjoGTtAcEzcitGpLsdc4p/OJEjnpaJZgha/fdcBhsNDJaIcwG2+HBl7sOojPL1Sa6KOdMD5U/sRZHPtJ0oA= 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: Leon Romanovsky Add kernel-doc section for iommu_unmap and iommu_unmap_fast to document existing limitation of underlying functions which can't split individual ranges. Suggested-by: Jason Gunthorpe Acked-by: Will Deacon Reviewed-by: Christoph Hellwig Signed-off-by: Leon Romanovsky --- drivers/iommu/iommu.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 3dc47f62d9ff..66b0bf6418ef 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2618,6 +2618,25 @@ size_t iommu_unmap(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_unmap); +/** + * iommu_unmap_fast() - Remove mappings from a range of IOVA without IOTLB sync + * @domain: Domain to manipulate + * @iova: IO virtual address to start + * @size: Length of the range starting from @iova + * @iotlb_gather: range information for a pending IOTLB flush + * + * iommu_unmap_fast() will remove a translation created by iommu_map(). + * It can't subdivide a mapping created by iommu_map(), so it should be + * called with IOVA ranges that match what was passed to iommu_map(). The + * range can aggregate contiguous iommu_map() calls so long as no individual + * range is split. + * + * Basically iommu_unmap_fast() is the same as iommu_unmap() but for callers + * which manage the IOTLB flushing externally to perform a batched sync. + * + * Returns: Number of bytes of IOVA unmapped. iova + res will be the point + * unmapping stopped. + */ size_t iommu_unmap_fast(struct iommu_domain *domain, unsigned long iova, size_t size, struct iommu_iotlb_gather *iotlb_gather)