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Mon, 7 Apr 2025 11:46:21 -0700 Date: Mon, 7 Apr 2025 11:46:19 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , Subject: Re: [PATCH rc 1/2] iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent() Message-ID: References: <20250407174408.GB1722458@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250407174408.GB1722458@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9D9:EE_|SN7PR12MB7912:EE_ X-MS-Office365-Filtering-Correlation-Id: c38ba07d-312d-4266-6bcb-08dd76048cce X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?7IwwXTqb6OBOuLvRZy95uNTcLuyl6kuVmd95u1nT/h6n67W3PwRH+bNyZNGL?= =?us-ascii?Q?Rd7R97Q19T/yE8IV+ksb+MEb5P6fcKqI3C5F61yl4iKFWt+VUvh626Rx5g+b?= =?us-ascii?Q?WJYLKU8SoM1/dlbEzjije6cB2mJAufFzP1QM3eP0KUh2XhXbQ3xDcZlnMmMh?= =?us-ascii?Q?1KxOXMIruzzTPo6Ggtg39VGbyx75z0q05ciU0sh26A1b8FVYjCkAWXcOmiY7?= =?us-ascii?Q?4u4CAM8yFNq1XAfRmk/MMxh8ZFWK0NUT+hDt7E0M9RjpQToK1ZmTjT9rxnJo?= =?us-ascii?Q?Hqz6Jo7t2uDCjPBE0Z7MjMlOXJJ9wjuKkPQfc5/8Xc4UTx0X8fW6LfAZXk0x?= =?us-ascii?Q?rDvhogYBBoYeX+KJCUfz6vLAw//IXcVsWo2Jv92kAKffCduTeD7gdCXlZvRi?= =?us-ascii?Q?i7vqnKr5j09Ncv8Mn+dktddohQ8MSjckQN7KuE2VjM9bb79JSdYn8wcuEHrZ?= =?us-ascii?Q?bMWw7SYjPGd2hWapA0JFoD2FvN6ggkEbpX8HyI/FjLfK6tUJDX4RxbQI+g23?= =?us-ascii?Q?EjGUqMjsjFd27qKxDW6Cw0jQdseAStqCZr+OpL+5JmTXKujocZSi8XrHfmje?= =?us-ascii?Q?B6eLfeDLrkGxS6StwtLOf+uKfweY6RpG3rt2ROI8cCyQA5s8eVdgufnsVcsJ?= =?us-ascii?Q?YRbl2S+wfoZSKNM6+zHSZU+Y5lszoHSMCPHTXQeJPbm4tRCRvU7rJ4U3tttG?= =?us-ascii?Q?DEyleVs2SOESj2jYyBKzNacnXIFXWWUX8GC9T++qdP/xDew16f0LTLbNnzf+?= =?us-ascii?Q?3sPRkL2VBMA7rqKfX1712NQbgsm+Psnpg0pMoRfY8rnJO9gw8ls0J1rZBee8?= =?us-ascii?Q?MsyuYlT1O/VSzEsrSjNuRAkA/SG/X6reJWwmBwkY2zeuemXiqBGwhAsYutCU?= =?us-ascii?Q?h0L8XNckCJkwlmcv0vo78rYKYwY+ZFPhQpruBU7+weR6hn+7l0bA9ek+zuGc?= =?us-ascii?Q?H4OLI29ttObQf3u4hTu5w5JApdGD73ymihlg7XGOQKgQ4Kq4qkXhWBoyqA2R?= =?us-ascii?Q?SqohFc8cxu5301GhVJbOjjKgToeJEBDXfd9eTbdKV4svPSvsd97RWPG7aQp3?= =?us-ascii?Q?hK2YX/XO3a7oDJ2ZsejVhrhoe7j2IAZyWJsquU+lrBQdT/HwCKvbH7LD/TqH?= =?us-ascii?Q?2eYlgDGdL0vvBxCNo88DoYpXVs7o2D29UXRYDKWqfES35dWb1kNlnLOUrILk?= =?us-ascii?Q?Y25vC3VLtd+LLAz8dD3OUb5aKgipbTdzCQkVB52kSSTn90J65VBUQn4rwsI/?= =?us-ascii?Q?kq+1edlBwZ9tGpeodT1e7w15+G4QpDmMnDGaxkcL4ll6UrjPhll8JuPxDFXS?= =?us-ascii?Q?V7FZLrhL0tazPP9D3aw6h6NphVD6Eu4BSwoLenhaiNQ2xTlG7Q0GR4opryGD?= =?us-ascii?Q?w5V0UimakQS4BtEsEuVHnqs5dLN5JV4hC0ds2NOBJkE6cEFvX+EgNfLtdXFl?= =?us-ascii?Q?1bMilxa1krD6kjk03bOMQCpRiEXb3/z/H/6WEiEUJ8WSRR9J2FORJEfHLZcx?= =?us-ascii?Q?P6JaYRL0Pm5RmZU=3D?= 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)(82310400026)(376014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Apr 2025 18:46:46.9200 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c38ba07d-312d-4266-6bcb-08dd76048cce 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: CY4PEPF0000E9D9.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7912 On Mon, Apr 07, 2025 at 02:44:08PM -0300, Jason Gunthorpe wrote: > On Mon, Apr 07, 2025 at 01:34:59AM -0700, Nicolin Chen wrote: > > Two WARNINGs are observed when SMMU driver rolls back upon failure: > > arm-smmu-v3.9.auto: Failed to register iommu > > arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22 > > ------------[ cut here ]------------ > > WARNING: CPU: 5 PID: 1 at kernel/dma/mapping.c:74 dmam_free_coherent+0xc0/0xd8 > > Call trace: > > dmam_free_coherent+0xc0/0xd8 (P) > > tegra241_vintf_free_lvcmdq+0x74/0x188 > > tegra241_cmdqv_remove_vintf+0x60/0x148 > > tegra241_cmdqv_remove+0x48/0xc8 > > arm_smmu_impl_remove+0x28/0x60 > > devm_action_release+0x1c/0x40 > > ------------[ cut here ]------------ > > 128 pages are still in use! > > WARNING: CPU: 16 PID: 1 at mm/page_alloc.c:6902 free_contig_range+0x18c/0x1c8 > > Call trace: > > free_contig_range+0x18c/0x1c8 (P) > > cma_release+0x154/0x2f0 > > dma_free_contiguous+0x38/0xa0 > > dma_direct_free+0x10c/0x248 > > dma_free_attrs+0x100/0x290 > > dmam_free_coherent+0x78/0xd8 > > tegra241_vintf_free_lvcmdq+0x74/0x160 > > tegra241_cmdqv_remove+0x98/0x198 > > arm_smmu_impl_remove+0x28/0x60 > > devm_action_release+0x1c/0x40 > > > > For the first warning: when the main SMMU driver cleans up its resources, > > any routine in arm_smmu_impl_remove() should not use any devres function. > > Bleck. This is situations where you should not be using devres at all. > > It is not that arm_smmu_impl_remove() should not use devres, the > problem is that arm_smmu_impl_probe() has mis-ordered the devres > callbacks if ops->device_remove() is going to be manually freeing > things that probe allocated. > > IMHO you should just put the goto unwind back into arm_smmu_device() > probe and not use devm for ops->device_remove(). That will put things > in their proper order and no problem. I did that in my first attempt but it didn't keep the "fallback to standard SMMU" part as the driver was.. But giving it a second thought, I think this fallback might not be necessary at all since a structure allocation failure so the standard SMMU driver will unlikely be able to continue normally. I think the correct way is to fail init_structures and that will ask SMMU driver to unwind with smmu->impl_ops->device_remove, as you suggested here. Thanks Nicolin