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Mon, 25 May 2026 13:40:11 -0700 Date: Mon, 25 May 2026 13:40:09 -0700 From: Nicolin Chen To: Pranjal Shrivastava CC: , , , , "Joerg Roedel" , Will Deacon , Bjorn Helgaas , David Woodhouse , Lu Baolu , Robin Murphy , "Suravee Suthikulpanit" , Jason Gunthorpe , David Matlack , Samiullah Khawaja , Daniel Mentz , Pasha Tatashin , Mostafa Saleh Subject: Re: [PATCH v4 3/5] iommu/arm-smmu-v3: Fix ATS state tracking Message-ID: References: <20260525184347.4059549-1-praan@google.com> <20260525184347.4059549-4-praan@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF0000014A:EE_|DS7PR12MB8250:EE_ X-MS-Office365-Filtering-Correlation-Id: 32a96079-01a9-416d-e422-08deba9ddc8a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|36860700016|82310400026|22082099003|56012099003|11063799006|4143699003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 6P3rMGuZAfD7qfEJ/5taIsfNb5TJFFYC6PVwetkSQQydyolPJGINcK0P3mcIkVbrIZETTmpIa2P6lew6Z0C13qlx/2VW+aCQ7YQvo06USkXQp6bH5d8itz57mzDYWMIjfqJ3fl8FUsE87SUyhIErRzVX2FIn73vE0aCUZPB9E+ulN0vzaJKiPiD4KuZbpF7T20SbJ4xOxGFFgMYwqIuXK9o5bpiblBic/Z4J5kTATbULqkZ1nWIZPoXz786DimKiqDddPxsJS54TYJPhYtdYi90cjZA/MwbrkT/T19CunFbNy7lHbNVwy4S3N3m/94yCSLtogE/7O7xTs2hvp1MI45mOIhFmsRQG70txP2uONWdRcoChFetvYwWWOcLX8UnyZ71lCZbn2Nv+bu+wIgziL05PnjZqE5ZwCjss/hJWTxotvAMOWi8SmR2u8vtbx3HY X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2026 20:40:30.4302 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 32a96079-01a9-416d-e422-08deba9ddc8a 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: CH2PEPF0000014A.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8250 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260525_134057_708338_56902277 X-CRM114-Status: GOOD ( 10.27 ) 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 Mon, May 25, 2026 at 08:30:18PM +0000, Pranjal Shrivastava wrote: > On Mon, May 25, 2026 at 01:05:36PM -0700, Nicolin Chen wrote: > > On Mon, May 25, 2026 at 06:43:45PM +0000, Pranjal Shrivastava wrote: > > - pci_prepare_ats() covers pci_ats_supported(). > > the idea was to call prepare only if ATS was > supported [1] i.e. not penalise non-ATS callers of pci_prepare_ats. But Yea. I realized that it is slightly different after I replied. Nicolin