linux-kernel - Re: [RFC 7/7] gpu: nova-core: load the scrubber ucode when vGPU support is enabled

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Message-Id: <DEYILYUO4JUG.3BGBWBQSN2CCX@nvidia.com>
Date: Mon, 15 Dec 2025 13:45:08 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Zhi Wang" <zhiw@...dia.com>, <rust-for-linux@...r.kernel.org>,
 <linux-pci@...r.kernel.org>, <nouveau@...ts.freedesktop.org>,
 <linux-kernel@...r.kernel.org>
Cc: <airlied@...il.com>, <dakr@...nel.org>, <aliceryhl@...gle.com>,
 <bhelgaas@...gle.com>, <kwilczynski@...nel.org>, <ojeda@...nel.org>,
 <alex.gaynor@...il.com>, <boqun.feng@...il.com>, <gary@...yguo.net>,
 <bjorn3_gh@...tonmail.com>, <lossin@...nel.org>, <a.hindborg@...nel.org>,
 <tmgross@...ch.edu>, <markus.probst@...teo.de>, <helgaas@...nel.org>,
 <cjia@...dia.com>, <alex@...zbot.org>, <smitra@...dia.com>,
 <ankita@...dia.com>, <aniketa@...dia.com>, <kwankhede@...dia.com>,
 <targupta@...dia.com>, <acourbot@...dia.com>, <joelagnelf@...dia.com>,
 <jhubbard@...dia.com>, <zhiwang@...nel.org>, "Nouveau"
 <nouveau-bounces@...ts.freedesktop.org>
Subject: Re: [RFC 7/7] gpu: nova-core: load the scrubber ucode when vGPU
 support is enabled

On Sat Dec 6, 2025 at 9:42 PM JST, Zhi Wang wrote:
> To support the maximum vGPUs on the device that support vGPU, a larger
> WPR2 heap size is required. By setting the WPR2 heap size larger than 256MB
> the scrubber ucode image is required to scrub the FB memory before any
> other ucode image is executed.

So the trigger for running the scrubber ucode is not as much "vGPU is in
use" as it is "the WPR2 heap size is larger than 256MB".

Can we change the code to reflect that? We have the `fb_layout`
structure available at this time, so it should be easy IIUC.