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From: Bagas Sanjaya <bagasdotme@gmail.com>
To: Huacai Chen <chenhuacai@loongson.cn>,
	Bjorn Helgaas <bhelgaas@google.com>,
	jiaxun.yang@flygoat.com, Aurelien Jarno <aurel32@debian.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Regressions <regressions@lists.linux.dev>,
	Linux PCI <linux-pci@vger.kernel.org>,
	Linux Loongarch <loongarch@lists.linux.dev>
Subject: Fwd: PCI: Loongson: 8b3517f88ff2 breaks PCIe on some system
Date: Sun, 23 Jul 2023 09:03:03 +0700	[thread overview]
Message-ID: <871f22f4-c456-db15-3466-085971bd1221@gmail.com> (raw)

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> After 8b3517f88ff2 ("PCI: loongson: Prevent LS7A MRRS increases") backported to stable, we have received multiple regression reports including one from Debian build farm[1] that some systems failed to initialize some PCIe devices.
> 
> I was able to reproduce on one of my Loongson-3A4000+7A system. It seems like the root cause is firmware on those systems didn't set MRRS properly but 8b3517f88ff2 ("PCI: loongson: Prevent LS7A MRRS increases") assumed firmware's maximum MRRS is always valid.
> 
> [1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035587

See Bugzilla for the full thread.

The linked Debian BTS entry have debugging details on this regression
(boot log, cpuinfo, and lspci).

Anyway, I'm adding this regression to regzbot:

#regzbot introduced: 8b3517f88ff298 https://bugzilla.kernel.org/show_bug.cgi?id=217680
#regzbot title: LS7A MRRS quirk fails to initialize PCIe devices
#regzbot link: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1035587

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217680

-- 
An old man doll... just what I always wanted! - Clara

             reply	other threads:[~2023-07-23  2:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-23  2:03 Bagas Sanjaya [this message]
2023-07-23 11:13 ` Fwd: PCI: Loongson: 8b3517f88ff2 breaks PCIe on some system Thorsten Leemhuis

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