linux-kernel - Re: [PATCH v11 0/9] Provide a new two step DMA mapping API

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Message-ID: <2e89d7e2-9146-46c7-86b0-8023483e5e07@samsung.com>
Date: Tue, 6 May 2025 10:55:23 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Leon Romanovsky <leon@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>, Keith
	Busch <kbusch@...nel.org>, Jake Edge <jake@....net>, Jonathan Corbet
	<corbet@....net>, Jason Gunthorpe <jgg@...pe.ca>, Zhu Yanjun
	<zyjzyj2000@...il.com>, Robin Murphy <robin.murphy@....com>, Joerg Roedel
	<joro@...tes.org>, Will Deacon <will@...nel.org>, Sagi Grimberg
	<sagi@...mberg.me>, 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>,
	Jérôme Glisse <jglisse@...hat.com>, Andrew Morton
	<akpm@...ux-foundation.org>, 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, Niklas Schnelle
	<schnelle@...ux.ibm.com>, Chuck Lever <chuck.lever@...cle.com>, Luis
	Chamberlain <mcgrof@...nel.org>, Matthew Wilcox <willy@...radead.org>, Dan
	Williams <dan.j.williams@...el.com>, Kanchan Joshi <joshi.k@...sung.com>,
	Chaitanya Kulkarni <kch@...dia.com>
Subject: Re: [PATCH v11 0/9] Provide a new two step DMA mapping API

On 05.05.2025 09:01, Leon Romanovsky wrote:
> Hi Marek,
>
> These are the DMA/IOMMU patches only, which have not seen functional
> changes for a while.  They are tested and reviewed and ready to merge.
>
> We will work with relevant subsystems to merge rest of the conversion
> patches. At least some of them will be done in next cycle to reduce
> merge conflicts.
>
> Thanks
>
> =========================================================================
> Following recent on site LSF/MM 2025 [1] discussion, the overall
> response was extremely positive with many people expressed their
> desire to see this series merged, so they can base their work on it.
>
> It includes, but not limited:
>   * Luis's "nvme-pci: breaking the 512 KiB max IO boundary":
>     https://lore.kernel.org/all/20250320111328.2841690-1-mcgrof@kernel.org/
>   * Chuck's NFS conversion to use one structure (bio_vec) for all types
>     of RPC transports:
>     https://lore.kernel.org/all/913df4b4-fc4a-409d-9007-088a3e2c8291@oracle.com
>   * Matthew's vision for the world without struct page:
>     https://lore.kernel.org/all/Z-WRQOYEvOWlI34w@casper.infradead.org/
>   * Confidential computing roadmap from Dan:
>     https://lore.kernel.org/all/6801a8e3968da_71fe29411@dwillia2-xfh.jf.intel.com.notmuch
>
> This series is combination of effort of many people who contributed ideas,
> code and testing and I'm gratefully thankful for them.


Thanks everyone involved in this contribution. I appreciate the effort 
of showing that such new API is really needed and will be used by other 
subsystems. I see benefits from this approach and I hope that any 
pending issues can be resolved incrementally.

I've applied this patchset to dma-mapping-next branch and it will be 
also available as dma-mapping-for-6.16-two-step-api [1] stable branch 
for those who wants to base their pending work on it.

[1] 
https://web.git.kernel.org/pub/scm/linux/kernel/git/mszyprowski/linux.git/log/?h=dma-mapping-for-6.16-two-step-api

> ...

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland