From patchwork Tue Dec 17 13:00:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13911720 X-Patchwork-Delegate: bhelgaas@google.com Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 833321F03F1; Tue, 17 Dec 2024 13:01:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734440498; cv=none; b=JgtyeapUYdc7jIcZR7kAr+bj06lkFHjitMI9I73VGnPhTxqeC5OPb32+Ba7QHgL6v8rJzxo0uqP2ZApNvxMPNBpnzH+Q7s8+Ety3vtpnLXq1wBR+EF3D9OpimJADniB3fO0/TE2y7JNmRODxq223RvqD0J6/JAMoUcwikhy3dgA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734440498; c=relaxed/simple; bh=txr0vDjl8mznkO+cXTCQ+EHv0Saw9V/4thNLzvjUkyQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NiHNihAI9/RdHXmWpJzmgBvMl4XjDQg1n74bhKOLwbnX0wNTUcLC/3t+ssV/oeFzJe1mOIoDbmZlpKk41b9ic/D2BcKxuvnuGFflEBgbttcRQ+De1tEEXJJhUf/UY2E/MCIDOauaTZ12wyYDlg6LfyimU84Fl7eWQJS4qMeczbo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LdACD9MK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LdACD9MK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5DE30C4CED4; Tue, 17 Dec 2024 13:01:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1734440498; bh=txr0vDjl8mznkO+cXTCQ+EHv0Saw9V/4thNLzvjUkyQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LdACD9MKWm1D6X4kRWaGTcthlF/q9vCUHezCoZOdL0kT2cXJttd2ePXuz/zIlQNyl p1T9uZdqg7os8bvNjLWvtY/Lr5cR2Z6JNP5SfO4oN3KqvQr2euWy6ueUFvzxsHQDwC R45dGMGpmp5NuG7inw7meA1EvPtQkjchsEYMbFYmmszNsEWpE+01zji7p4Mx25xe6B mrP6eP1QXEnn8RWQ6/61RZRHfZJSAS8otC1BZrVeMEHTBEdyH9ULX4tUYI+DZpbVrA FT6u2VbZ7DoMdvqfBKNbj2KHcChAxZFAfQfGV2qhyQFOB5pBToEvmDShClNsfty4Qt I2BRfo/20eJ5Q== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg Cc: Leon Romanovsky , 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 v5 04/17] iommu: add kernel-doc for iommu_unmap and iommu_unmap_fast Date: Tue, 17 Dec 2024 15:00:22 +0200 Message-ID: <0ae577f8b99f7e03c679729434c87ea7daf78955.1734436840.git.leon@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 ec75d14497bf..c86a57abe292 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)