From: "Alexandre Courbot" <acourbot@nvidia.com>
To: "Joel Fernandes" <joelagnelf@nvidia.com>
Cc: <linux-kernel@vger.kernel.org>, "Miguel Ojeda" <ojeda@kernel.org>,
"Boqun Feng" <boqun@kernel.org>, "Gary Guo" <gary@garyguo.net>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Dave Airlie" <airlied@redhat.com>,
<dri-devel@lists.freedesktop.org>,
<nouveau@lists.freedesktop.org>, <rust-for-linux@vger.kernel.org>,
"Nikola Djukic" <ndjukic@nvidia.com>, <joel@joelfernandes.org>
Subject: Re: [PATCH v8 25/25] gpu: nova-core: mm: Add PRAMIN aperture self-tests
Date: Thu, 05 Mar 2026 16:26:52 +0900 [thread overview]
Message-ID: <DGUO5DR4WL2W.21OSXWPYKC239@nvidia.com> (raw)
In-Reply-To: <855853e7-f9cc-4661-bb62-c8d4fff86a76@nvidia.com>
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 != 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 `Chipset`, not the
version of the page table format? I understand the two are linked
transitively, but they are in practice different engines.
next prev parent reply other threads:[~2026-03-05 7:27 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-24 22:52 [PATCH v8 00/25] gpu: nova-core: Add memory management support Joel Fernandes
2026-02-24 22:52 ` [PATCH v8 01/25] gpu: nova-core: Select GPU_BUDDY for VRAM allocation Joel Fernandes
2026-03-01 12:41 ` Alexandre Courbot
2026-02-24 22:53 ` [PATCH v8 02/25] gpu: nova-core: Kconfig: Sort select statements alphabetically Joel Fernandes
2026-03-01 12:40 ` Alexandre Courbot
2026-02-24 22:53 ` [PATCH v8 03/25] gpu: nova-core: gsp: Return GspStaticInfo and FbLayout from boot() Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 04/25] gpu: nova-core: gsp: Extract usable FB region from GSP Joel Fernandes
2026-03-01 12:43 ` Alexandre Courbot
2026-02-24 22:53 ` [PATCH v8 05/25] gpu: nova-core: fb: Add usable_vram field to FbLayout Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 06/25] gpu: nova-core: mm: Add support to use PRAMIN windows to write to VRAM Joel Fernandes
2026-03-02 11:58 ` Alexandre Courbot
2026-03-03 19:44 ` Joel Fernandes
2026-03-02 12:23 ` Alexandre Courbot
2026-03-03 21:01 ` Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 07/25] docs: gpu: nova-core: Document the PRAMIN aperture mechanism Joel Fernandes
2026-03-02 12:02 ` Alexandre Courbot
2026-02-24 22:53 ` [PATCH v8 08/25] gpu: nova-core: mm: Add common memory management types Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 09/25] gpu: nova-core: mm: Add TLB flush support Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 10/25] gpu: nova-core: mm: Add GpuMm centralized memory manager Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 11/25] gpu: nova-core: mm: Use usable VRAM region for buddy allocator Joel Fernandes
2026-03-01 12:56 ` Alexandre Courbot
2026-03-02 3:08 ` Alexandre Courbot
2026-03-03 23:54 ` Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 12/25] gpu: nova-core: mm: Add common types for all page table formats Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 13/25] gpu: nova-core: mm: Add MMU v2 page table types Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 14/25] gpu: nova-core: mm: Add MMU v3 " Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 15/25] gpu: nova-core: mm: Add unified page table entry wrapper enums Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 16/25] gpu: nova-core: mm: Add page table walker for MMU v2/v3 Joel Fernandes
2026-02-25 5:39 ` Gary Guo
2026-02-25 14:26 ` Joel Fernandes
2026-03-01 13:15 ` Gary Guo
2026-03-02 20:10 ` Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 17/25] gpu: nova-core: mm: Add Virtual Memory Manager Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 18/25] gpu: nova-core: mm: Add virtual address range tracking to VMM Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 19/25] gpu: nova-core: mm: Add multi-page mapping API " Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 20/25] gpu: nova-core: Add BAR1 aperture type and size constant Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 21/25] gpu: nova-core: gsp: Add BAR1 PDE base accessors Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 22/25] gpu: nova-core: mm: Add BAR1 user interface Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 23/25] gpu: nova-core: mm: Add BarUser to struct Gpu and create at boot Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 24/25] gpu: nova-core: mm: Add BAR1 memory management self-tests Joel Fernandes
2026-02-24 22:53 ` [PATCH v8 25/25] gpu: nova-core: mm: Add PRAMIN aperture self-tests Joel Fernandes
2026-03-02 12:04 ` Alexandre Courbot
2026-03-02 20:11 ` Joel Fernandes
2026-03-05 7:26 ` Alexandre Courbot [this message]
2026-03-06 1:49 ` Joel Fernandes
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