linux-kernel - Re: [PATCH v8 4/6] gpu: nova-core: use ENOTSUPP for unsupported GPUs, in all cases

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Message-Id: <DE8ICG1D8UN0.33C679TUWJDOR@nvidia.com>
Date: Sat, 15 Nov 2025 00:03:23 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "John Hubbard" <jhubbard@...dia.com>, "Danilo Krummrich"
 <dakr@...nel.org>
Cc: "Alexandre Courbot" <acourbot@...dia.com>, "Joel Fernandes"
 <joelagnelf@...dia.com>, "Timur Tabi" <ttabi@...dia.com>, "Alistair Popple"
 <apopple@...dia.com>, "Edwin Peer" <epeer@...dia.com>, "Zhi Wang"
 <zhiw@...dia.com>, "David Airlie" <airlied@...il.com>, "Simona Vetter"
 <simona@...ll.ch>, "Bjorn Helgaas" <bhelgaas@...gle.com>, "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>, "Benno Lossin"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 <nouveau@...ts.freedesktop.org>, <rust-for-linux@...r.kernel.org>, "LKML"
 <linux-kernel@...r.kernel.org>, "Nouveau"
 <nouveau-bounces@...ts.freedesktop.org>
Subject: Re: [PATCH v8 4/6] gpu: nova-core: use ENOTSUPP for unsupported
 GPUs, in all cases

On Fri Nov 14, 2025 at 11:41 AM JST, John Hubbard wrote:
> Some places in the driver use ENODEV for unsupported GPUs, while others
> use ENOTSUPP. ENOTSUPP is more accurate, so change the ENODEV instances
> to ENOTSUPP.

Mmm actually I suspect we do want to return `ENODEV` in those cases, for
the driver core to interpret the error as "I reject this particular
device":

https://elixir.bootlin.com/linux/v6.13/source/drivers/base/dd.c#L588