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Sat, 17 Oct 2026 11:16:49 -0700 Received: from nvidia.com (10.127.8.13) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49 via Frontend Transport; Sat, 17 Oct 2026 11:16:48 -0700 Date: Sat, 17 Oct 2026 11:16:45 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Pranjal Shrivastava , , "Will Deacon" , Joerg Roedel , Robin Murphy , Mostafa Saleh , Daniel Mentz , Ashish Mhetre , , Thomas Gleixner , Radu Rendec , Bjorn Helgaas , , , "Greg Kroah-Hartman" , , "Danilo Krummrich" , Subject: Re: [PATCH v11 11/16] iommu/arm-smmu-v3: Add CMDQ_PROD_STOP_FLAG to gate CMDQ submissions Message-ID: References: <20260929034510.2023173-1-praan@google.com> <20260929034510.2023173-12-praan@google.com> <20261002164748.GD3481470@ziepe.ca> <20261017174912.GK14213@ziepe.ca> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20261017174912.GK14213@ziepe.ca> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY6PEPF0000004E:EE_|CH0PR12MB8505:EE_ X-MS-Office365-Filtering-Correlation-Id: c3805e99-f6b8-4eaf-5b36-08df2c7ad7ac X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|7416014|376014|1800799024|23010399003|82310400026|56012099006|260925021311599003|260925021911599003|260925022911599003|4143699003|11063799006|261009223027099003|261009221227099003|10067099003|22082099003|18002099003|13003099007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: tKmPJ94/yib+oDkYUZ4q/qRqc8UHRoOrSzrpoWonyqiDU3FGiJKQISya5TapoLmtIOT2AxkY4PKkN3Z7ikUsI6SYXtyRCcztHiUMlrU+feYrzNCFWeUYHxjQnF9P9Z1USxfW8aAnYj8wCSUPtoj5RQYWSXdn22Cm1vC/KYxdPJSEX1B4zDxMRXL2NDw8d1cSFr4FTR3Bc6UwKk46gEHTDsqaFZ5+vAahTA6smTnN0vdLs5uIuYc5lnLuZlQC9akBmVJidn5LqdgePY+Qr/yu8xzoGN822OIdhWbyvD7Jhr3+rH+cdzcPhZIY4kZ8NkOGPw5Xks42pPOqGmF767ykZbVbyElATlSXefy4aCD5UYA9lqwcP8cDP9sFJeB9CqdcKQuYUFamcmtZmSXuhyNdiCJNvMLQuARpFiUFqYvffUBeMYR8Yu1oUWWM96/5nfDz X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2026 18:17:02.4686 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c3805e99-f6b8-4eaf-5b36-08df2c7ad7ac 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: CY6PEPF0000004E.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH0PR12MB8505 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261017_111738_534231_5D800A10 X-CRM114-Status: GOOD ( 13.02 ) 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 Sat, Oct 17, 2026 at 02:49:12PM -0300, Jason Gunthorpe wrote: > On Tue, Oct 06, 2026 at 10:26:41AM -0700, Nicolin Chen wrote: > > > pci_dev_reset_iommu_prepare/done() pair (with slight refactoring) in EP's > > > suspend/resume? > > > > That sounds right to me, though a different API for suspend/resume > > will be required. And call them in pci_pm_runtime_suspend/resume() > > maybe. > > > > Jason, how do you think about this? > > Maybe lets just start by refusing power management when ATS is on? For > PCIe devices too? > > It isn't just ARM that has this issue, every iommu is busted if you > suspend the PCI device while an ATS domain is still active.. So, should we put that refuse guard in pci_pm_runtime_suspend()? I am thinking about splitting the iommu and pci patches out of my smmmuv3_atc_timeout series. They could be get merged alone. Then, we add a new API for pci_pm_runtime_suspend/resume() with a new BLOCKED_SUSPEND reason in the list: https://lore.kernel.org/linux-iommu/bf5ccc916593357c640cd7fcdffabfb46fdf4c64.1790188510.git.nicolinc@nvidia.com/ Nicolin