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Tue, 16 Apr 2024 15:19:46 -0700 Date: Tue, 16 Apr 2024 15:19:44 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , Joerg Roedel , , Robin Murphy , Will Deacon , Eric Auger , "Moritz Fischer" , Moritz Fischer , Michael Shavit , , Shameerali Kolothum Thodi , Mostafa Saleh Subject: Re: [PATCH v7 5/9] iommu/arm-smmu-v3: Make arm_smmu_alloc_cd_ptr() Message-ID: References: <0-v7-cb149db3a320+3b5-smmuv3_newapi_p2_jgg@nvidia.com> <5-v7-cb149db3a320+3b5-smmuv3_newapi_p2_jgg@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <5-v7-cb149db3a320+3b5-smmuv3_newapi_p2_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000F0E0:EE_|PH7PR12MB7844:EE_ X-MS-Office365-Filtering-Correlation-Id: 6ef38b71-e188-4751-3d20-08dc5e635bd8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: QUDgYr8GC+RVYrk9ZhKpPr/fynM5AROd7yuQjQt3FSo4M/C2qS4DbYZFDhzdYoghqyLyKdrVRNlzNFisBH+H4Ehhzs+Vhzc2XgC9E+AuhTwfmS+S3dRuvQ3nldoQJSUnxvfKMDg3B+gA75TioC47YNmbAKJSZBoVND1ByaUVlivZpqo7VWR8fCAV1Fk3O1Nd7AblPqBL/e+qZ60pCMa05yzXt4l0SZlWah/QyG8Eji77q1/kKkiNxREASNbcfAhFlyFYLm4iZoqZLDjP2AaByaJkxwTUwz/xiA97Afgj7XDeW7Fmvwf2aKPiv7njJFXecdUn2YkHnfod0burLpGWgDqRJOw8As06B94Kxt8nKkxxLIkmFe544V88x53h+uAnYy8gVGIooV9kfNftp889sf/HlOqFwN4nM7v3K9ZsvsQvswJsswnPT80bF6gZkye1eLILPqIDI6y6qRBZJ0S4lxVE91RZpJBgGtednmIeUMAUBJUqkRCV0ZalM+n9qY/WgExPPpvc5hZE8PfBzQJBD3VTSp5NLAT25v3MZ3hWYxM7Gq8Cy2APfCKkptRpFaSIM5W3JLwDGZEkAqegU5SQuGvimhuwvEXrX5D/wAlHetf8bklUsA57Gtd4X6L3b/WuFmEhUUNlqUcY/TnCGOkU90h9zsJ+wbESRveUSTeiPS/ErUni25P8MqJSeOd3Hu3GBVXLPAfSk5N1XQFhqGyNVl4NldTwdSc2T1bU3wQELHD4JzggUqWjn4n67oeNi3/e 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:(13230031)(7416005)(1800799015)(376005)(82310400014)(36860700004);DIR:OUT;SFP:1101; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 16, 2024 at 04:28:16PM -0300, Jason Gunthorpe wrote: > Only the attach callers can perform an allocation for the CD table entry, > the other callers must not do so, they do not have the correct locking and > they cannot sleep. Split up the functions so this is clear. > > arm_smmu_get_cd_ptr() will return pointer to a CD table entry without > doing any kind of allocation. > > arm_smmu_alloc_cd_ptr() will allocate the table and any required > leaf. > > A following patch will add lockdep assertions to arm_smmu_alloc_cd_ptr() > once the restructuring is completed and arm_smmu_alloc_cd_ptr() is never > called in the wrong context. > > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel