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Fri, 13 Jun 2025 16:17:27 -0700 Date: Fri, 13 Jun 2025 16:17:24 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , Subject: Re: [PATCH v1 11/12] iommufd: Introduce iommufd_object_alloc_ucmd helper Message-ID: References: <52edfd3e74c264f0f7b1f706d29e9edcb705e2db.1749488870.git.nicolinc@nvidia.com> <20250613135817.GG1174925@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250613135817.GG1174925@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017091:EE_|BY5PR12MB4193:EE_ X-MS-Office365-Filtering-Correlation-Id: a9cd74da-e088-463d-1cb1-08ddaad082b8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|7416014|82310400026|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?LjtQXZdXU3dBBL95fb43pwhm1r96DWkoBGPG9gLJxvsUqsTHY3a3qTWsG5tY?= =?us-ascii?Q?dQMfrdOnQ8OZN+4JItdIbgYComeqnXimHw6pxRa27xgf2T4Z3PjYo1TgAwOt?= =?us-ascii?Q?9258zWOxx80sBflmZWsun4twHJpwdm1RmAm67MnJMusU8aS1GSGAlR5s+obP?= =?us-ascii?Q?Wr+ic6cgBst4jf1UVQuK2FLLzmdpJatichQVSDHNZFN5X3Nn7JbxgblF0G+H?= =?us-ascii?Q?+YWn64a8nI8PlepT7VjS2+iXma/hIkok/AkPvvTz2p+HOngyHplOXFt/wd+y?= =?us-ascii?Q?WpEpA/M6r2QvsAH0FATpnEizKDW7AuhpDvt2U/yMQEtAMiGLT/c3Y/PD5Z8h?= =?us-ascii?Q?saxh0C89Bo3a9KVx5wsZNliXuG+W6EVXTyAqFUSpmDYkyWXcKoPdfyQTmZIo?= =?us-ascii?Q?dXR3O+lOVq1zyE6xfYuvvZXXma1dI8Uij0YTgXjDiv7E6QUywBwC1viR3z7F?= =?us-ascii?Q?ePsxzeyOKVtjl0rl7gQJPpdeia0wjhn4fpgVpdJIIXK7a3tJkyT5fQcecARL?= =?us-ascii?Q?sIhBB53L31NNgqf7Z+fJoYaaSnqk5ZUAV0EiQAr94Kcho2o2i0lnhZffQgIS?= =?us-ascii?Q?mj9J6L+RM6y/pZSgyXme3Egr8AtyYMVJNjySh+D74xApq+rFwNRy9uYII6Sh?= =?us-ascii?Q?dsL7IpjjfnKxIl51w7rx7CNSlKGK8txyK4nEWCl6W1cjxjSwCtSzWGztVH8/?= =?us-ascii?Q?6w4MdpIsyB3c5BBSGjQS6U0wZOfryKQRCAJYnEp6vPI8uvOLNr8q4FAF+Vt6?= =?us-ascii?Q?0dmGA+wBA8tZJZx9C9wDBmuVzDzd5Imr6wIb3Wp8MdudvzHtLGM3xJgggxg6?= =?us-ascii?Q?LVnQJI6o8SEAAkFB3LVIUHjdLGyBYnWN2g9G8mIjdBOhoR9ncpJUpcjpcFrm?= =?us-ascii?Q?23JfDSZg2vr5VyZoO5+3PkopfeEPq2cIKGctYe6qCIRcQMXiaOVzrYGCTZ0m?= =?us-ascii?Q?18V4c22aAmFeVf7Zs0x2Sm45NmC4p1yaIJ4eg7u0JQlbQgfIK62JSP/L94/C?= =?us-ascii?Q?u8cpYlpDwxkckwRaBQufSvOLwf9S9TxtaJOv151XM0Tor4w18Q6tdFM8RRpN?= =?us-ascii?Q?lNXY2JKoOr4adwGHIkm5Pex8noa4eoieqw46uUMdJ9Z6mj8bj+k9p7AilOy6?= =?us-ascii?Q?kLGs6+T4Ha/2BfTVSW/g8tlWX8I2sDWAv0uavyXpsEegnbFWuMEtvBOQGy8w?= =?us-ascii?Q?Ob9TamjHze5CtD4pvyfQY/UeiFH12De+QzyjixiI4WPbckTK+AeFJoaHmFjd?= =?us-ascii?Q?xHeqtN0ofpFbPpzKFNI/YU4OSzY9WiKRC6xQZ2iQbwRxYD4tV1vs6DJ6R1rC?= =?us-ascii?Q?FoOWc6noiucuV3GKZuand1FcTBSOJJvPW2OPYJsvlvoMMUBjj8Of+nbaTJbT?= =?us-ascii?Q?MYTEbVwm5ZaPs8y/kxhRZYW4x/K/O8B75i/1qzcRF9oqnakeBYRElT1IPBk2?= =?us-ascii?Q?3jzd4OS7R3r3SGi8LKmCbGTBFJcDJ2Kt74/T5KtmHF3ClMVGEf97inIBtNID?= =?us-ascii?Q?WdjS9ueMVQDlTEvkLpsOkRFR8RjDKqDyJf5K?= 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)(36860700013)(1800799024)(7416014)(82310400026)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Jun 2025 23:17:47.8063 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a9cd74da-e088-463d-1cb1-08ddaad082b8 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: DS1PEPF00017091.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4193 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250613_161758_949438_8DE9DB0A X-CRM114-Status: GOOD ( 14.61 ) 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 Fri, Jun 13, 2025 at 10:58:17AM -0300, Jason Gunthorpe wrote: > On Mon, Jun 09, 2025 at 10:13:34AM -0700, Nicolin Chen wrote: > > > +#define iommufd_object_alloc_ucmd(ucmd, ptr, type) \ > > + __iommufd_object_alloc_ucmd(ucmd, ptr, type, obj) > > Lets add a comment here and on the normal iommufd_object_alloc > explaining that this function automatically calls finalize and abort, > the non ucmd version requires the caller to do so. Yes. @@ -231,6 +231,11 @@ iommufd_object_put_and_try_destroy(struct iommufd_ctx *ictx, iommufd_object_remove(ictx, obj, obj->id, 0); } +/* + * Callers of these normal object allocators must call iommufd_object_finalize() + * to finalize the object, or call iommufd_object_abort_and_destroy() to revert + * the allocation. + */ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, enum iommufd_object_type type); @@ -247,6 +252,10 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, #define iommufd_object_alloc(ictx, ptr, type) \ __iommufd_object_alloc(ictx, ptr, type, obj) +/* + * Callers of these _ucmd allocators should not call iommufd_object_finalize() + * or iommufd_object_abort_and_destroy(), as the core automatically does that. + */ struct iommufd_object * _iommufd_object_alloc_ucmd(struct iommufd_ucmd *ucmd, size_t size, enum iommufd_object_type type); > > +struct iommufd_object *_iommufd_object_alloc_ucmd(struct iommufd_ucmd *ucmd, > > + size_t size, > > + enum iommufd_object_type type) > > +{ > > + struct iommufd_object *new_obj; > > + > > + if (ucmd->new_obj) > > WARN_ON? Something is coded wrong if we hit this right? Yes. @@ -67,7 +67,8 @@ struct iommufd_object *_iommufd_object_alloc_ucmd(struct iommufd_ucmd *ucmd, { struct iommufd_object *new_obj; - if (ucmd->new_obj) + /* Something is coded wrong if this is hit */ + if (WARN_ON(ucmd->new_obj)) return ERR_PTR(-EBUSY); new_obj = _iommufd_object_alloc(ucmd->ictx, size, type); Thanks Nicolin