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Thu, 27 Aug 2026 14:18:08 -0700 Date: Thu, 27 Aug 2026 14:18:08 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Will Deacon , Robin Murphy , "Joerg Roedel" , Bjorn Helgaas , "Rafael J . Wysocki" , Len Brown , "Pranjal Shrivastava" , Mostafa Saleh , Lu Baolu , Kevin Tian , , , , , , , Shuai Xue Subject: Re: [PATCH v5 03/18] PCI: Propagate FLR return values to callers Message-ID: References: <178786269177.3808739.6763094519382046767.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <178786269177.3808739.6763094519382046767.b4-review@b4> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN7PEPF0000009F:EE_|IA1PR12MB6412:EE_ X-MS-Office365-Filtering-Correlation-Id: 1f248a6e-dbd5-470a-5c7a-08df0480bfcf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|7416014|376014|82310400026|1800799024|23010399003|6133799003|10067099003|11063799006|56012099006|4143699003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: rKwPuLNcjaITRMMjGbIjDz5KN4Pc+ODlkeby4T+QLxy1mh0oNKgz+cojqyxBeNKHfN/fb9YYrsYVGfnHawK+l1yG39m9BJrNjZ6ZZG8MBaxWejSYFB0HvnTQGj4P+kaWnccYn/jsaZbtC2SfcXDp4ZW6Vpi1J/x25V243NifhzQKjXxJWZhsOfQC2wFEv2zlNLqzTWh3Plot/kfGwU6oOWmRItNihVU5tYzpZkiJP3OwHjtewc6e9nLM7VJqET/fS4VXb158nZiP3unTAlxdOauxSSEHB0sYeRujm0QwZ84Ke/4WXDWSISd+BNl4dK2rcoVauFe0tbLPsRzKWbE6PWNlZpEd5EjOrjyKWDtmz5iJR0LgheETenI8OsPjMuWlg3bDx4i5DalV1CTykV+XDSwZydAphO+mX5fNnO0+zkEAVCfQV+/kyYMl0KDyX72ockkk4RT03xIVxKjmGThrCsLHUpAhyS+dQXPAfdJ3QlwINfusffqGN71ItC9+l9JXjbDzXFUbbaajaOPhnmbWVE2gFVlEHVTEqwIVPE6Qe6IjeqcKpJLO1ux6/K1hXCMeHbYZNh3iOOPHAl+fRdk33YIp+9tXiPQCr4U+MAUAvNhPIMXwv5R+Zy7H62Ykjg9W3ovACkANoakCqQwF2nZI4Y8XBOhkB/rNO78Fr3cYfWZuXWxhjdJ8y6cNj5TjZ0C0wNnvd3MnuAb8SJHO1Y4XDA== X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700016)(7416014)(376014)(82310400026)(1800799024)(23010399003)(6133799003)(10067099003)(11063799006)(56012099006)(4143699003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jdibQtJz9ZzzVAZeD/qLLVJhxmY3dRdS5zuQi1FCTdNfK6MEAHxNVujhfvKPX8zxQLUPt+sPtxzKivuVw2x/zwRjCrVCIIfVLKbuAuVW7/vw4m+YRZcsmNfbf07H8g+coRye1kC0Sd2bezk8til6p/UAo5wSX8JMzdqCA73osH6EWOnRbN93rLAledNQKfzvAuP5RIi7xSLZUMFrdyeaF6ATpvb3APw0/Kdydz7lOiZkmH3gGKbFdkPOSViszmJUoeL50hbvhSUgYkQD9y1CpPGU2UHCLkfKu/N/5rIb19La2K5PMA9Qa7ixNt3Zn9mcHMHkYsDnHUIsS4N8g3ov6Fl5QxsGdfdxlx1F73Bv0rxNVaj6Mr59pO5v5rAcLXZ3WkIN1DioAd5xP68SluTjX60gNn07G1JYaaZQB6C32G+PpXHQ7mKoP9pO/hJ/BGiD X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2026 21:18:32.8425 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1f248a6e-dbd5-470a-5c7a-08df0480bfcf X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN7PEPF0000009F.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6412 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260827_141844_492832_E7A52802 X-CRM114-Status: GOOD ( 23.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Aug 27, 2026 at 05:31:31PM -0300, Jason Gunthorpe wrote: > > [ ... 24 lines skipped ... ] > > Since these quirks have always returned success, escalating > > would be a new and harmful behavior: the next method is typically the plain > > "flr" method, which would re-run the same FLR without the extra steps the > > quirk wraps around its pcie_flr() call. Add quirk_flr_err() converting that > > -ENOTTY to -ETIMEDOUT, so the cascade still stops at the quirk as before. > > The early "not applicable" -ENOTTY returns are left intact, and they still > > ask the caller to try the next method. > > This seems like a very suspect AI conclusion to me. > > I think I'd drop this patch > > > Convert it at the quirk level rather than in pcie_flr() or pci_dev_wait(), > > because those also serve the native "flr"/"af_flr"/"pm" methods, where the > > -ENOTTY on timeout is deliberate per commit 91295d79d658 ("PCI: Handle FLR > > failure and allow other reset types"): a timed-out native FLR escalates to > > a stronger reset (e.g. bus reset), which skips no workaround there and may > > recover the device. Converting in the core would also change the value seen > > by every direct pcie_flr() caller. > > > > This is not a bug fix, since these functions have always returned success > > and the propagated values are only consumed by incoming work. > > In what way? The quirks flows always succeed and it can keep always > succeeding. If anyone finds this problematic they can properly > propogate the error. > > Squashing the error just for quirks makes little sense. PATCH-5 forwards the return values to pci_dev_reset_iommu_done(), so IOMMU can keep a device blocked on a nonzero result. Dropping this patch would leave the three VF quirks here always reporting success, reopening the stale-ATC issue this series is fixing for them. Or do you think it's okay? Thanks Nicolin