linux-kernel - Re: [PATCH v5] io: add io

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Message-ID: <aWa-KVC8CVvn8GGs@um790>
Date: Tue, 13 Jan 2026 13:50:33 -0800
From: Deborah Brouwer <deborah.brouwer@...labora.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Will Deacon <will@...nel.org>,
	Daniel Almeida <daniel.almeida@...labora.com>,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>, Joerg Roedel <joro@...tes.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Asahi Lina <lina+kernel@...hilina.net>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	iommu@...ts.linux.dev, linux-mm@...ck.org
Subject: Re: [PATCH v5] io: add io_pgtable abstraction

On Tue, Jan 13, 2026 at 08:49:27AM +0000, Alice Ryhl wrote:
> From: Asahi Lina <lina+kernel@...hilina.net>
> 
> This will be used by the Tyr driver to create and modify the page table
> of each address space on the GPU. Each time a mapping gets created or
> removed by userspace, Tyr will call into GPUVM, which will figure out
> which calls to map_pages and unmap_pages are required to map the data in
> question in the page table so that the GPU may access those pages when
> using that address space.
> 
> The Rust type wraps the struct using a raw pointer rather than the usual
> Opaque+ARef approach because Opaque+ARef requires the target type to be
> refcounted.
> 
> Signed-off-by: Asahi Lina <lina+kernel@...hilina.net>
> Acked-by: Boris Brezillon <boris.brezillon@...labora.com>
> Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>
> Co-developed-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>

As part of the wip for booting Tyr firmware, I have been using this
io_pgtable abstraction including v5.

Built and tested on arm64 with rustc 1.91.0 and bindgen 0.72.1.

Tested-by: Deborah Brouwer <deborah.brouwer@...labora.com>