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Tue, 26 May 2026 19:40:34 -0700 Date: Tue, 26 May 2026 19:40:33 -0700 From: Nicolin Chen To: Qinxin Xia CC: , , , , , , , , , , , Subject: Re: [PATCH 5/5] iommu/arm-smmu-v3: Add Context Descriptor display to debugfs Message-ID: References: <20260328101706.3448655-1-xiaqinxin@huawei.com> <20260520063714.2440584-5-xiaqinxin@huawei.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260520063714.2440584-5-xiaqinxin@huawei.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF0000000C:EE_|PH7PR12MB6540:EE_ X-MS-Office365-Filtering-Correlation-Id: 0fcd523d-030f-4976-ac29-08debb996066 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|1800799024|82310400026|376014|7416014|4143699003|22082099003|18002099003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: v+q93Z/l+kxqR/JXIBFul5idU4f8id2hANXDIvWJCOnyu0dC+vBs5JigrybMLzlH1lnr/MwLlQknpsQrSz4wkU/EMY4N02tprI73i+88IbeBALQm+4LQCpKAxK7/NihtbPdKBppYYFU6hulB4v9aqIepHkBMe+DcJGy16EGyTEGqqNc6iIdPVjQ5tx0pF0DdRnK4tZ431CHRjQjQ1UICdavjnIM6uSWZQY1CEQ6vM7ggJHhNw8fOeNwuWlLaiaEUjsYX8tXo4LEu7ZaEaRULzG7bEcGnamj13/CLZeZOvDutwCAfZM8LaHg/4wpshPQYhKE4NQ3q3etbExmLxWAw2hoTTYrDOSiaFp+Bz8zcqL0+zap4MhYYZbQcjGTn2XgJ7qDprf7Wait0NrVXeeD+q0Nwl40wMw93dJYv79bLw3k2iKFT7ckhby6nWGiMrqT+ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2026 02:40:55.3297 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0fcd523d-030f-4976-ac29-08debb996066 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: CH3PEPF0000000C.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6540 On Wed, May 20, 2026 at 02:37:11PM +0800, Qinxin Xia wrote: > +static int smmu_debugfs_cd_show(struct seq_file *seq, void *unused) > +{ > + struct device *dev = seq->private; > + struct arm_smmu_master *master; > + u32 max_ssids, ssid; > + > + guard(mutex)(&arm_smmu_asid_lock); > + > + master = dev_iommu_priv_get(dev); > + if (!master) { > + seq_puts(seq, "No master data\n"); > + return 0; > + } arm_smmu_asid_lock fences against domain attachments, required by CD (yes). But, it doesn't fence against a device unplug. So this might need both streams_mutex and asid_lock. Nicolin