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Received: from DS0PR12MB7630.namprd12.prod.outlook.com (2603:10b6:8:11d::6) by MN2PR12MB4343.namprd12.prod.outlook.com (2603:10b6:208:26f::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9520.5; Thu, 15 Jan 2026 20:11:12 +0000 Received: from DS0PR12MB7630.namprd12.prod.outlook.com ([fe80::c81a:611d:7325:7744]) by DS0PR12MB7630.namprd12.prod.outlook.com ([fe80::c81a:611d:7325:7744%2]) with mapi id 15.20.9520.005; Thu, 15 Jan 2026 20:11:12 +0000 Message-ID: Date: Thu, 15 Jan 2026 12:11:09 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] PCI: Mark Nvidia GB10 to avoid bus reset To: Bjorn Helgaas , =?UTF-8?B?Sm9obm55LUNDIENoYW5nICjlvLXmmYvlmIkp?= Cc: "lukas@wunner.de" , Project_Global_Digits_Upstream_Group , AngeloGioacchino Del Regno , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-pci@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "bhelgaas@google.com" , "matthias.bgg@gmail.com" , Jason Gunthorpe , Alex Williamson References: <20260114172832.GA822909@bhelgaas> Content-Language: en-US From: Terje Bergstrom In-Reply-To: <20260114172832.GA822909@bhelgaas> Content-Type: text/plain; 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It's useful if we can include a bread > crumb that will help people identify the crash and find a fix. We observed retraining to lower PCIe lane count and config read timeout. So yes crash is not the best way to describe it. > I'm confused about what the topology is. I first assumed GB10 was > a PCIe Endpoint, since Secondary Bus Reset only applies to devices > below a bridge, so SBR would be applied to a device by a config > write to that bridge. gb10 is an SoC designed by NVIDIA and Mediatek in collaboration. It's not an endpoint, but has its own PCIe controller for connecting PCIe peripherals like NVMe drives, NIC, etc. > If this is actually a GB10 issue, it sounds like a hardware erratum > that lots of users would see and Nvidia would likely be aware of. We're aware. We've maintained a quirk in a kernel tree for DGX Spark  and other gb10 powered products until this gets upstreamed. Terje