From: Christoph Hellwig <hch@lst.de>
To: Leon Romanovsky <leon@kernel.org>
Cc: "Baolu Lu" <baolu.lu@linux.intel.com>,
"Jens Axboe" <axboe@kernel.dk>, "Jason Gunthorpe" <jgg@ziepe.ca>,
"Robin Murphy" <robin.murphy@arm.com>,
"Joerg Roedel" <joro@8bytes.org>, "Will Deacon" <will@kernel.org>,
"Christoph Hellwig" <hch@lst.de>,
"Sagi Grimberg" <sagi@grimberg.me>,
"Keith Busch" <kbusch@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Logan Gunthorpe" <logang@deltatee.com>,
"Yishai Hadas" <yishaih@nvidia.com>,
"Shameer Kolothum" <shameerali.kolothum.thodi@huawei.com>,
"Kevin Tian" <kevin.tian@intel.com>,
"Alex Williamson" <alex.williamson@redhat.com>,
"Marek Szyprowski" <m.szyprowski@samsung.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Jonathan Corbet" <corbet@lwn.net>,
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
Subject: Re: [PATCH 05/18] dma: Provide an interface to allow allocate IOVA
Date: Tue, 29 Oct 2024 08:46:31 +0100 [thread overview]
Message-ID: <20241029074631.GD22316@lst.de> (raw)
In-Reply-To: <20241028063740.GD1615717@unreal>
On Mon, Oct 28, 2024 at 08:37:40AM +0200, Leon Romanovsky wrote:
> In this specific case, the physical address is used to calculate
> IOVA offset, see "size_t iova_off = iova_offset(iovad, phys);" line,
> which is needed for NVMe PCI/block layer, as they can have first
> address to be unaligned and IOVA allocation will need an offset to
> properly calculate size.
And that is also very explicitly spelled out in the kerneldoc comments,
including the note that the physical address is optional if the
transfer is granule aligned (actually it says PAGE_SIZE which should
be fixed).
Any suggestions to further improve it are welcome of course.
next prev parent reply other threads:[~2024-10-29 7:46 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-27 14:21 [PATCH 00/18] Provide a new two step DMA mapping API Leon Romanovsky
2024-10-27 14:21 ` [PATCH 01/18] PCI/P2PDMA: refactor the p2pdma mapping helpers Leon Romanovsky
2024-10-28 18:10 ` Logan Gunthorpe
2024-10-28 20:59 ` Bjorn Helgaas
2024-10-29 16:48 ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 02/18] dma-mapping: move the PCI P2PDMA mapping helpers to pci-p2pdma.h Leon Romanovsky
2024-10-28 18:11 ` Logan Gunthorpe
2024-10-29 15:11 ` Bjorn Helgaas
2024-10-27 14:21 ` [PATCH 03/18] iommu: generalize the batched sync after map interface Leon Romanovsky
2024-10-27 14:21 ` [PATCH 04/18] dma-mapping: Add check if IOVA can be used Leon Romanovsky
2024-10-27 14:21 ` [PATCH 05/18] dma: Provide an interface to allow allocate IOVA Leon Romanovsky
2024-10-28 1:24 ` Baolu Lu
2024-10-28 6:37 ` Leon Romanovsky
2024-10-29 7:46 ` Christoph Hellwig [this message]
2024-10-28 4:24 ` Srinivasulu Thanneeru
2024-10-28 6:46 ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 06/18] iommu/dma: Factor out a iommu_dma_map_swiotlb helper Leon Romanovsky
2024-10-27 14:21 ` [PATCH 07/18] dma-mapping: Implement link/unlink ranges API Leon Romanovsky
2024-10-28 2:00 ` Baolu Lu
2024-10-28 6:22 ` Leon Romanovsky
2024-10-28 18:31 ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 08/18] dma-mapping: add a dma_need_unmap helper Leon Romanovsky
2024-10-27 14:21 ` [PATCH 09/18] docs: core-api: document the IOVA-based API Leon Romanovsky
2024-10-28 18:12 ` Logan Gunthorpe
2024-10-28 18:28 ` Leon Romanovsky
2024-10-27 14:21 ` [PATCH 10/18] mm/hmm: let users to tag specific PFN with DMA mapped bit Leon Romanovsky
2024-10-27 14:21 ` [PATCH 11/18] mm/hmm: provide generic DMA managing logic Leon Romanovsky
2024-10-27 14:21 ` [PATCH 12/18] RDMA/umem: Store ODP access mask information in PFN Leon Romanovsky
2024-10-27 14:21 ` [PATCH 13/18] RDMA/core: Convert UMEM ODP DMA mapping to caching IOVA and page linkage Leon Romanovsky
2024-10-27 14:21 ` [PATCH 14/18] RDMA/umem: Separate implicit ODP initialization from explicit ODP Leon Romanovsky
2024-10-27 14:21 ` [PATCH 15/18] vfio/mlx5: Explicitly use number of pages instead of allocated length Leon Romanovsky
2024-10-27 14:21 ` [PATCH 16/18] vfio/mlx5: Rewrite create mkey flow to allow better code reuse Leon Romanovsky
2024-10-27 14:21 ` [PATCH 17/18] vfio/mlx5: Explicitly store page list Leon Romanovsky
2024-10-27 14:21 ` [PATCH 18/18] vfio/mlx5: Convert vfio to use DMA link API Leon Romanovsky
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