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no-senders; approved; emergency; loop; banned-address; member-moderation CC: linux-kernel@vger.kernel.org, Miguel Ojeda , Boqun Feng , Gary Guo , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Dave Airlie , dri-devel@lists.freedesktop.org, nouveau@lists.freedesktop.org, rust-for-linux@vger.kernel.org, Nikola Djukic , joel@joelfernandes.org X-Mailman-Version: 3.3.8 Precedence: list List-Id: Nouveau development list Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Tue Mar 3, 2026 at 5:11 AM JST, Joel Fernandes wrote: > On Mon, Mar 02, 2026 at 09:04:07PM +0900, Alexandre Courbot wrote: >> > + // PRAMIN support is only for MMU v2 for now (Turing/Ampere/Ada). >> > + if mmu_version !=3D MmuVersion::V2 { >> >> Why is that? I thought PRAMIN was also working on Hopper+. Isn't it >> orthogonal to the kind of MMU used? > > The PRAMIN aperture window register changed on Hopper+: pre-Hopper uses > NV_PBUS_BAR0_WINDOW while Hopper+ uses NV_XAL_EP_BAR0_WINDOW. Our > current code only programs the former, so we'd need a HAL to support > both. For now, V2-only is the safe choice. I've updated the comment to > explain this. I see, but then it seems that the correct check would be against the `Chips= et`, not the version of the page table format? I understand the two are linked transitively, but they are in practice different engines.