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b=AOOf6Y0mFh8eaLlqUYaStweSkz4DuWDmM5g52GCOkAPYc1JLbqg3lvf3YSZedB5hq I7YPao5jZ7PVdb5yLDFgUlyfFUAdsvYrD2O+N1GQL1ugH3GyJMizhP+2zRdTDutTtm 6Arc5CR8SWcEOS618cLmUutubaOWsAUZ5S4w8pnYyGc8EOww19gd9qY57pmnTY3446 rDQDtBCTbwMHdkeWYFbIL0Q2+lz4lvUQC5JkKCvPRuSzjFCPq/I4yB/O49lx3fBh5+ nC3MNGBucQEWuM+Rb3Ho6G75E6IdHFTfEgvjbUMPUx4zAeeNoTPV8AE+YhZUqvYG++ 2+GCFe1W9EuRw== 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?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 , Jason Gunthorpe Subject: [PATCH v10 04/24] iommu: add kernel-doc for iommu_unmap_fast Date: Mon, 28 Apr 2025 12:22:10 +0300 Message-ID: <6c4bbb539bec7b827b9e9cc24779c9e9c43fc3ed.1745831017.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: rspam11 X-Rspamd-Queue-Id: 4F8F6C000B X-Stat-Signature: a4aqqnuin3k7xsk4raxjqw1f6ieoitdy X-Rspam-User: X-HE-Tag: 1745832179-236976 X-HE-Meta: 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 +60m5FRD 0nR6TxA4xFKWyyNH9Vl8i9MaLCkb52iHyhRdjAQdXnXPJ4bUtIT0XFLFqzqADzaezUu3l5Pd4RempVn2cFDgeyggh9QTHzH9o+juI88vq4zFjRTk4ypWW80oXBZsOKg+E39Lya1hLzrQMe3oR7b0aRbLPpYfWtj2pfKFoXkyse1vB/7yq6JJ+8vcT+WxLUDxV49Shq+pviC5YM3voL9T2enhHSPon1cTw5EDfwRwYznCwKMGt0RYP7evdgzllsZ8nmeDITO95xofYIzbbj27vlr5WfO438DsBdgOrQ1BTtNKc/7A= 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_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 Tested-by: Jens Axboe Reviewed-by: Jason Gunthorpe Reviewed-by: Luis Chamberlain 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 02960585b8d4..8619c355ef9c 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2621,6 +2621,25 @@ 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) -- 2.49.0