linux-kernel - Re: [PATCH v6 00/24] nova-core: run FWSEC-FRTS to perform first stage of GSP initialization

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Message-ID: <e8b9f61a-5816-4447-855e-9998ded12389@nvidia.com>
Date: Mon, 23 Jun 2025 22:17:56 -0700
From: John Hubbard <jhubbard@...dia.com>
To: Alexandre Courbot <acourbot@...dia.com>,
 Danilo Krummrich <dakr@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Benno Lossin <lossin@...nel.org>, Ben Skeggs <bskeggs@...dia.com>,
 Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>,
 Alistair Popple <apopple@...dia.com>, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, Lyude Paul <lyude@...hat.com>,
 Shirish Baskaran <sbaskaran@...dia.com>
Subject: Re: [PATCH v6 00/24] nova-core: run FWSEC-FRTS to perform first stage
 of GSP initialization

On 6/23/25 7:56 PM, Alexandre Courbot wrote:
> On Tue Jun 24, 2025 at 6:01 AM JST, Danilo Krummrich wrote:
>> There's one thing that would be nice to fix subsequently, which is properly
>> resetting the GPU. Currently, it needs a power cycle to be able to probe
>> successfully after unbinding the driver.
> 
> Yes, what I usually do is the following after unloading Nova:
> 
>     echo 1 | sudo tee /sys/bus/pci/devices/0000:01:00.0/reset
> 
> and this allows it to probe again. Maybe we want to add some equivalent
> programmatically in the driver probe function?

At this point, we are only getting things up to a certain very early
stage. And so we have to reset like this in order to try again.

But I'm not sure that will be the case, once we have more code in
place to go further.

So maybe hold off on this for a few weeks or so?

thanks,
-- 
John Hubbard