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Wed, 5 Feb 2025 14:41:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738766467; bh=0zY9wH2OP9d22rL1O7KXuZTa/ogQAL5HzMoIiMUubaE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=paVneeAJqn/ltBJv6BGhRXTQ/1o7gRgteq2iCdVfu0se6SR44/XZ19uVDs57AYcx5 G6SYFwf9oPkm9cSNiuGfKntNAWNpRrba6qFPBtdsBpcbKc4/ygjDK7v9rRTgtNgXJY wMEOH+TPUG4apPSNsLSopbZGBVV/xLPSIuqZV6NOJslRLA1vKskQA0UyhxlHcTpCDu DL1YnlM5CiKBwg4+D+3xSdmQ51egLGcf890c1UIfYj2+bGGKlIShSQq08wTw6gpzyw F/J3DHrDVo1YPqcaiE1BNjK2tJyO9YQnTqr6eKZ8NQTx3Y+qbGNoPheStWyzcZwbPr fZsxDVy3Q2DYg== From: Leon Romanovsky To: Christoph Hellwig , Jason Gunthorpe , Robin Murphy Cc: Leon Romanovsky , 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 , Jason Gunthorpe Subject: [PATCH v7 04/17] iommu: add kernel-doc for iommu_unmap and iommu_unmap_fast Date: Wed, 5 Feb 2025 16:40:24 +0200 Message-ID: <49d9ef3273ab03821931114329c49ae02b1cd902.1738765879.git.leonro@nvidia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: References: MIME-Version: 1.0 X-Stat-Signature: mocreep51qbywqjxjspiieen79ew1ist X-Rspam-User: X-Rspamd-Queue-Id: C293316000E X-Rspamd-Server: rspam03 X-HE-Tag: 1738766468-551742 X-HE-Meta: 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 ZQa8rBdA O33DxU+3zlve6rtbpJaT4mUQ3Lb2IFa3YOWYRR1InZdsJ77SdA44pjWuPoZlQePcpO6myVI1Ud+ShHU+f/dcY0q7xyXUuFEARieqCNgDa6RnknGsYrXmuzur7+f8GzdfwQ9GPIbE2TcvLeL1e8RYAi5BuunpYgbLa3H9ymI9Ls/RlOg2e0H7t208dPOp35r514jN2EwMCNxqqApqzXrR8XMwDsbMN0f8V4yA2qB7x+eGpKQ9iOtnWqdtuJzX0nvLp/w4ro/bl6u/tShY= 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 32b161988c4b..89b538eec5cb 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2590,6 +2590,25 @@ 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)