linux-kernel - Re: [PATCH] PCI: Mark Nvidia GB10 to avoid bus reset

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Message-ID: <8d91c98a99a0a1b368691a93141f4f14e5ece44c.camel@mediatek.com>
Date: Wed, 14 Jan 2026 06:39:24 +0000
From: Johnny-CC Chang (張晋嘉)
	<Johnny-CC.Chang@...iatek.com>
To: "lukas@...ner.de" <lukas@...ner.de>
CC: Project_Global_Digits_Upstream_Group
	<Project_Global_Digits_Upstream_Group@...iatek.com>, "AngeloGioacchino Del
 Regno" <angelogioacchino.delregno@...labora.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "bhelgaas@...gle.com"
	<bhelgaas@...gle.com>, "matthias.bgg@...il.com" <matthias.bgg@...il.com>
Subject: Re: [PATCH] PCI: Mark Nvidia GB10 to avoid bus reset

On Tue, 2025-11-18 at 17:39 +0800, Johnny-CC Chang wrote:
> On Thu, 2025-11-13 at 10:39 +0100, Lukas Wunner wrote:
> > On Thu, Nov 13, 2025 at 04:44:06PM +0800, Johnny Chang wrote:
> > > Nvidia GB10 PCIe hosts will encounter problem occasionally
> > > after SBR(secondary bus reset) is applied.
> > 
> > Could you elaborate what kinds of problems occur, how often they
> > occur, etc?
> 
> There is about 1/1000 chance that after SBR is applied, any further
> access via this root port will be blocked and make system crash. 
> 
> Thanks,
> 
> Johnny

I would like to update below description to replace original comment in
v1 patch, is this information sufficient? 
--------
/*
 * After SBR(secondary bus reset) is applied on an Nvidia GB10
 * PCIe root port, there is 1/1000 chance that further requests
 * via this root port will be blocked and cause system unstable.
 */
--------