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Howlett" , Asahi Lina , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, iommu@lists.linux.dev, linux-mm@kvack.org Subject: Re: [PATCH v5] io: add io_pgtable abstraction Message-ID: References: <20260113-io-pgtable-v5-1-7ed771bc3d8d@google.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260113-io-pgtable-v5-1-7ed771bc3d8d@google.com> On Tue, Jan 13, 2026 at 08:49:27AM +0000, Alice Ryhl wrote: > From: Asahi Lina > > 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 > Acked-by: Boris Brezillon > Reviewed-by: Daniel Almeida > Co-developed-by: Alice Ryhl > Signed-off-by: Alice Ryhl > --- > 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