linux-kernel - Re: [PATCH] drm/nouveau: check ioctl command codes better

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Message-Id: <c32114e7-a61a-4c2b-ab4b-b103d028d05f@app.fastmail.com>
Date: Mon, 21 Jul 2025 14:37:36 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Satadru Pramanik" <satadru@...il.com>, "Arnd Bergmann" <arnd@...nel.org>
Cc: "Dave Airlie" <airlied@...il.com>, "Dave Airlie" <airlied@...hat.com>,
 "Ben Skeggs" <bskeggs@...dia.com>, "bskeggs@...hat.com" <bskeggs@...hat.com>,
 "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
 "open list" <linux-kernel@...r.kernel.org>, "Lyude Paul" <lyude@...hat.com>,
 "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
 "Simona Vetter" <simona@...ll.ch>, "Timur Tabi" <ttabi@...dia.com>,
 "Thomas Zimmermann" <tzimmermann@...e.de>
Subject: Re: [PATCH] drm/nouveau: check ioctl command codes better

On Mon, Jul 21, 2025, at 14:22, Satadru Pramanik wrote:
> Hello all,
>
> I suspect this commit in 6.16-rc7 has broken acceleration with Mesa's
> nouveau drivers on my machine.
>
> glxinfo -B reports that I'm using llvmpipe.

Thanks for the report!  Can you run the failing command with
'strace -f -o logfile.txt -e trace=ioctl ...' to see which command
it tries?

Either I made a stupid mistake in my patch and don't catch the
intended command any more, or the command that gets sent is actually
different from the one that the kernel expects.

      Arnd