linux-kernel - Re: drm/fbdev-dma: regression

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Message-ID: <da4288a6-96cc-4095-bd73-d66b68e9ed01@suse.de>
Date: Thu, 28 Nov 2024 16:47:08 +0100
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Nuno Gonçalves <nunojpg@...il.com>
Cc: Thorsten Leemhuis <regressions@...mhuis.info>,
 Linux kernel regressions list <regressions@...ts.linux.dev>,
 dri-devel@...ts.freedesktop.org, LKML <linux-kernel@...r.kernel.org>,
 Linux Framebuffer <linux-fbdev@...r.kernel.org>
Subject: Re: drm/fbdev-dma: regression

Hi

Am 11.11.24 um 14:42 schrieb Nuno Gonçalves:
> On Mon, Nov 11, 2024 at 1:22 PM Thomas Zimmermann <tzimmermann@...e.de> wrote:
>> The patch in question changes the whole memory management of the
>> affected code. It's also noteworthy that most of it has been reworked
>> for the upcoming v6.12. Maybe this already fixed the problem. Kernel
>> v6.11-rc7 added commit 5a498d4d06d6 ("drm/fbdev-dma: Only install
>> deferred I/O if necessary"), which possibly fixes the problem as well.
>>
>> But there's no explicit fix for this problem and I have not seen any
>> other related reports. Any further information is welcome.
> Issue was present since 5ab91447aa13b8b98bc11f5326f33500b0ee2c48 and
> tested until 6.12-rc3.
> Is there any suggestion on how to dig down?

Here's a first attempt to address this bug. Could you please apply the 
attached patch and report on the results? It should work against the 
upcoming v6.13-rc1 or against a recent drm-misc-next.

Best regards
Thomas

>
> Thanks

-- 
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

View attachment "0001-fbdev-dma-Support-deferred-I-O-without-smem_start.patch" of type "text/x-patch" (1886 bytes)