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Tue, 26 May 2026 18:28:13 -0700 Date: Tue, 26 May 2026 18:28:12 -0700 From: Nicolin Chen To: Qinxin Xia CC: , , , , , , , , , , , Subject: Re: [PATCH 2/5] iommu/arm-smmu-v3: Add register display to debugfs Message-ID: References: <20260328101706.3448655-1-xiaqinxin@huawei.com> <20260520063714.2440584-2-xiaqinxin@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260520063714.2440584-2-xiaqinxin@huawei.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AE7:EE_|PH7PR12MB6564:EE_ X-MS-Office365-Filtering-Correlation-Id: 8a8ada84-a0b5-4230-ccf5-08debb8f45f7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|36860700016|376014|1800799024|56012099006|6133799003|22082099003|18002099003|4143699003|11063799006; X-Microsoft-Antispam-Message-Info: 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 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)(82310400026)(7416014)(36860700016)(376014)(1800799024)(56012099006)(6133799003)(22082099003)(18002099003)(4143699003)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vhS57KBxp10iJVc5swgk0C0Vkdrt+OSkbiJjuMdPXxjBvXRCMr2f1P+1XzzNcZ2rUuIUk6FQkH54HFJ+gSnZbUhZxDPfjBYGvFedba4FCVHeXDZrvthkvDfgkq8ZfuIDTx7cBOhSj+6tKn4sXLIZutaIJ+QSVWLTeE7mv6mIVpc23beEsVC7OzF8flOY+oHv85mJFHDMx4CPsVksH4wr+PJKlHmYTaFK4ztXC7xcDQb3eUWK7/WH5sWYbBncdrh4exQzxfH7j40lq9/zmfQLMZ71w0T8pGMXMQ4DKKW4yzayLED11co929tynhnhfJzksA4KVtt9OMQk1e+Rb/XTeWUHGz6/CPVjxNOePlh7bSnVTpXeYkg8U5OKwyqO3fGOM42tRWN8s8/TTRhMZSpj3ROu5YUdjsv6oNo9s2jb1W6gHwV5Zjfw8CLjojHhKS4C X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 May 2026 01:28:36.0330 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8a8ada84-a0b5-4230-ccf5-08debb8f45f7 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: SA2PEPF00003AE7.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6564 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260526_182845_988835_5DDC8987 X-CRM114-Status: GOOD ( 12.56 ) 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 Wed, May 20, 2026 at 02:37:08PM +0800, Qinxin Xia wrote: > +static int smmu_debugfs_registers_open(struct inode *inode, struct file *file) > +{ > + struct arm_smmu_device *smmu = inode->i_private; > + int ret; > + > + if (!smmu || !get_device(smmu->dev)) > + return -ENODEV; > + > + ret = single_open(file, smmu_debugfs_registers_show, smmu); > + if (ret) > + put_device(smmu->dev); > + > + return ret; > +} > + > +static int smmu_debugfs_registers_release(struct inode *inode, struct file *file) > +{ > + struct seq_file *seq = file->private_data; > + struct arm_smmu_device *smmu = seq->private; > + > + single_release(inode, file); > + if (smmu) > + put_device(smmu->dev); > + > + return 0; > +} > + > +static const struct file_operations smmu_debugfs_registers_fops = { > + .owner = THIS_MODULE, > + .open = smmu_debugfs_registers_open, > + .read = seq_read, > + .llseek = seq_lseek, > + .release = smmu_debugfs_registers_release, > +}; These seem a bit redundant; only names and show functions are different from the cap's fops/open/release? If so, maybe we can mimic how drivers/usb/host/xhci-debugfs.c unify things (refer to w_context_files). Nicolin