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Fri, 4 Sep 2026 20:25:04 -0700 Date: Fri, 4 Sep 2026 20:24:54 -0700 From: Nicolin Chen To: Jonathan Cameron CC: , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v3 07/13] iommu/arm-smmu-v3: Disable the queue IRQs before disabling the SMMU Message-ID: References: <178846311318.1308030.6301643510859406126.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <178846311318.1308030.6301643510859406126.b4-review@b4> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN7PEPF0000009E:EE_|PH7PR12MB6738:EE_ X-MS-Office365-Filtering-Correlation-Id: 81a19117-4dd0-4314-a0d6-08df0afd5bd6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|82310400026|1800799024|36860700016|10067099003|3023799007|22082099003|18002099003|11063799006|4143699003|5023799004|56012099006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(376014)(7416014)(23010399003)(82310400026)(1800799024)(36860700016)(10067099003)(3023799007)(22082099003)(18002099003)(11063799006)(4143699003)(5023799004)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ZdgvWQOQW7PyQD9IgXbDcjFR3oOZBbpje6jVmKo1wXLiAvFkh7LuRASbZgcKmgZPT9SQq+/fnCGN7LsJkF9YTtYhFnj3ujJ5HLff38MY3izJ0wiq0skjWARzv3ERvTMyRLjqa0Y+fze21IeQiIlcy3fpTA7FOcfGLjGfZpQC/U/ppEq37505dMeStmnZu0kwb8YKbTzCzeu6uZJxIB9pOq9H3UsBx4phF7I6bNZTpooP+uGx9WpVwe0gJDrFQQaBnrvBeZC6AszoER8qP/j8AySdpEHvZV9wnekTlFUWeg+wD4LygnqjaCtYdyOPIBKGwSvQjma9i4Hc5ix1pPstYbtuaq/Lgaveu4KLMDNpYZ8f3x6iHAC3w7PtyKm0eaNkj14T85AJUYLVeImQne2OTYKd5dS/NS+FklyN0B1HIbIPGe7L5A7I+IQlhSmYkmKp X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Sep 2026 03:25:39.1774 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81a19117-4dd0-4314-a0d6-08df0afd5bd6 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN7PEPF0000009E.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6738 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260904_202555_121474_B20488BB X-CRM114-Status: GOOD ( 16.23 ) 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, Sep 03, 2026 at 12:18:33PM -0700, Jonathan Cameron wrote: > > The EVTQ, PRIQ and combined IRQ handlers are threaded and issue commands of > > their own, e.g. a CMDQ_OP_PRI_RESP for a page request. Disabling the SMMU > > while one is in flight hands that command to a queue consuming nothing, so > > its poll waits out a full timeout. > > > > Two paths disable the SMMU while those IRQs are still requested: a failing > > arm_smmu_device_reset() returns to a probe that disables the device itself, > > and arm_smmu_disable_action() covers an unbind or any later probe failure. > > Both can run after arm_smmu_setup_irqs() requested the IRQs. > > > > Disable those IRQs first in both paths, so that no handler is left running > > once the SMMU goes down. > > Why this soluton rather than a flag to stop them queuing new work + a > synchronize_irq() to deal with threads in flight. > > irq disables always worry me a little as they tend to be patching over > something nastier. I think this works though so I'm not going to > strongly object. Well, I don't see a reason to add extra flags: each irq here only has one single source, so disable_irq() is fundamentally similar to a flag + synchronize_irq(), but also masks the irq line, which makes sense in the probe-revert and shutdown paths. Above all, it is cleaner. If there is a solid reason for not using disable_irq() here, I'd not mind changing that though. Thanks Nicolin