linux-kernel - Re: [PATCH v5 00/17] Provide a new two step DMA mapping API

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Message-ID: <20250114083847.GE3146852@unreal>
Date: Tue, 14 Jan 2025 10:38:47 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Robin Murphy <robin.murphy@....com>
Cc: Jens Axboe <axboe@...nel.dk>, Jason Gunthorpe <jgg@...pe.ca>,
	Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
	Keith Busch <kbusch@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Logan Gunthorpe <logang@...tatee.com>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
	linux-rdma@...r.kernel.org, iommu@...ts.linux.dev,
	linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, linux-mm@...ck.org,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v5 00/17] Provide a new two step DMA mapping API

On Tue, Dec 17, 2024 at 03:00:18PM +0200, Leon Romanovsky wrote:
> Changelog:

<...>

> Christoph Hellwig (6):
>   PCI/P2PDMA: Refactor the p2pdma mapping helpers
>   dma-mapping: move the PCI P2PDMA mapping helpers to pci-p2pdma.h
>   iommu: generalize the batched sync after map interface
>   iommu/dma: Factor out a iommu_dma_map_swiotlb helper
>   dma-mapping: add a dma_need_unmap helper
>   docs: core-api: document the IOVA-based API
> 
> Leon Romanovsky (11):
>   iommu: add kernel-doc for iommu_unmap and iommu_unmap_fast
>   dma-mapping: Provide an interface to allow allocate IOVA
>   dma-mapping: Implement link/unlink ranges API
>   mm/hmm: let users to tag specific PFN with DMA mapped bit
>   mm/hmm: provide generic DMA managing logic
>   RDMA/umem: Store ODP access mask information in PFN
>   RDMA/core: Convert UMEM ODP DMA mapping to caching IOVA and page
>     linkage
>   RDMA/umem: Separate implicit ODP initialization from explicit ODP
>   vfio/mlx5: Explicitly use number of pages instead of allocated length
>   vfio/mlx5: Rewrite create mkey flow to allow better code reuse
>   vfio/mlx5: Enable the DMA link API
> 
>  Documentation/core-api/dma-api.rst   |  70 +++++
>  drivers/infiniband/core/umem_odp.c   | 250 +++++----------
>  drivers/infiniband/hw/mlx5/mlx5_ib.h |  12 +-
>  drivers/infiniband/hw/mlx5/odp.c     |  65 ++--
>  drivers/infiniband/hw/mlx5/umr.c     |  12 +-
>  drivers/iommu/dma-iommu.c            | 454 +++++++++++++++++++++++----
>  drivers/iommu/iommu.c                |  84 ++---
>  drivers/pci/p2pdma.c                 |  38 +--
>  drivers/vfio/pci/mlx5/cmd.c          | 376 +++++++++++-----------
>  drivers/vfio/pci/mlx5/cmd.h          |  35 ++-
>  drivers/vfio/pci/mlx5/main.c         |  87 +++--
>  include/linux/dma-map-ops.h          |  54 ----
>  include/linux/dma-mapping.h          |  86 +++++
>  include/linux/hmm-dma.h              |  33 ++
>  include/linux/hmm.h                  |  21 ++
>  include/linux/iommu.h                |   4 +
>  include/linux/pci-p2pdma.h           |  84 +++++
>  include/rdma/ib_umem_odp.h           |  25 +-
>  kernel/dma/direct.c                  |  44 +--
>  kernel/dma/mapping.c                 |  18 ++
>  mm/hmm.c                             | 264 ++++++++++++++--
>  21 files changed, 1423 insertions(+), 693 deletions(-)
>  create mode 100644 include/linux/hmm-dma.h

Hi Robin,

Can you please Ack the dma-iommu changes?

Thanks

> 
> -- 
> 2.47.0
> 
>