linux-kernel - Re: [PATCH v6 00/16] dma-mapping: migrate to physical address-based API

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Message-ID: <aM9LH6WSeOPGeleY@kbusch-mbp>
Date: Sat, 20 Sep 2025 18:47:27 -0600
From: Keith Busch <kbusch@...nel.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Abdiel Janulgue <abdiel.janulgue@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>, Danilo Krummrich <dakr@...nel.org>,
	David Hildenbrand <david@...hat.com>, iommu@...ts.linux.dev,
	Jason Wang <jasowang@...hat.com>, Jens Axboe <axboe@...nel.dk>,
	Joerg Roedel <joro@...tes.org>, Jonathan Corbet <corbet@....net>,
	Juergen Gross <jgross@...e.com>, kasan-dev@...glegroups.com,
	linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-nvme@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org,
	linux-trace-kernel@...r.kernel.org,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Robin Murphy <robin.murphy@....com>, rust-for-linux@...r.kernel.org,
	Sagi Grimberg <sagi@...mberg.me>,
	Stefano Stabellini <sstabellini@...nel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	virtualization@...ts.linux.dev, Will Deacon <will@...nel.org>,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v6 00/16] dma-mapping: migrate to physical address-based
 API

On Sat, Sep 20, 2025 at 06:53:52PM +0300, Leon Romanovsky wrote:
> On Fri, Sep 19, 2025 at 10:08:21AM -0600, Keith Busch wrote:
> > On Fri, Sep 12, 2025 at 12:03:27PM +0300, Leon Romanovsky wrote:
> > > On Fri, Sep 12, 2025 at 12:25:38AM +0200, Marek Szyprowski wrote:
> > > > >
> > > > > This series does the core code and modern flows. A followup series
> > > > > will give the same treatment to the legacy dma_ops implementation.
> > > > 
> > > > Applied patches 1-13 into dma-mapping-for-next branch. Let's check if it 
> > > > works fine in linux-next.
> > > 
> > > Thanks a lot.
> > 
> > Just fyi, when dma debug is enabled, we're seeing this new warning
> > below. I have not had a chance to look into it yet, so I'm just
> > reporting the observation.
> 
> Did you apply all patches or only Marek's branch?
> I don't get this warning when I run my NVMe tests on current dmabuf-vfio branch.

This was the snapshot of linux-next from the 20250918 tag. It doesn't
have the full patchset applied.

One other thing to note, this was runing on arm64 platform using smmu
configured with 64k pages. If your iommu granule is 4k instead, we
wouldn't use the blk_dma_map_direct path.