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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> 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> X-Rspam-User: X-Stat-Signature: gf11yisnh7nntqo6mjknrpramftz9yro X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 5FFD3C0006 X-HE-Tag: 1768341042-127009 X-HE-Meta: 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 V8UHZGeq 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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