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Fri, 30 May 2025 10:19:12 -0700 Date: Fri, 30 May 2025 10:19:10 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v5 28/29] iommu/tegra241-cmdqv: Add user-space use support Message-ID: References: <4a84673ef6fe040f1b551d059be466c2c7bdf2af.1747537752.git.nicolinc@nvidia.com> <20250530171052.GM233377@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250530171052.GM233377@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003443:EE_|CH3PR12MB7666:EE_ X-MS-Office365-Filtering-Correlation-Id: 562d4402-4e14-4e98-a84c-08dd9f9e2203 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|7416014|376014|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?4Z/gAUq682cGLKxfGzCPEzQYC3LhOU3OO6/3Xb9Mrpo8FyBruySfJ1vFpF0n?= =?us-ascii?Q?uUcsOiQ3CqQH1JGk0iGs5D6Nnb7o2OjoaoZjEUK84eXBsv29EjW5+ecX8l19?= =?us-ascii?Q?M8yJbzP2XgWvHNux+XVaxcpL2lf0/NAUY87sfg5I3RtSusjkrk7A5Q//q94u?= =?us-ascii?Q?Ra/k9xKfZT0c2HatFkIxnE8pvAOUGtIy9rJ7Yj3LhU4lKAYHs2FcbADUfq/l?= =?us-ascii?Q?gX+w4FIc/OxLA+0EBFHswZcXs2tDmaJlNomP42Q+R+U6cMfYBCb+bFr4PHV/?= =?us-ascii?Q?RiBRbkoGOat7ew8+RqyoaSga3TwC7/9I1QHyb7ggVcn4DNLLFarAzPb35tCO?= =?us-ascii?Q?2v09Y/xV6AcT/3ceKK0HvW1fAQIGWo01CaT59Q+awwYWMoN1J1KOYOPRl172?= =?us-ascii?Q?h5qsqYt/SULWkssKfwa4MdskR4VGmtVmOTAZ2/PpYU8Zv5IEtun/9Pcuj6Vj?= =?us-ascii?Q?faQ6odmlGHqBCtx6uYeuyuJzrf8JQwmNJZCgOyOLSPP5FzueVVs7FJcvX+jV?= =?us-ascii?Q?Uc9nTZtavp/rzBkl0X9/d3wmGiJCi/Bwra4vltnUWjOitMOUXgVu1JXL6YVz?= =?us-ascii?Q?LHU53s+XnRS60zV3Gl+EhmTkOEyNNH0T4tL75Mgpj/kzBwhXrxVDiLr8Bkhm?= =?us-ascii?Q?9kYS3UJldev1ldbOZqEQ9lTy2eojYpoX6tX1Txe1P+lIZa+MErrYdwwk8ETg?= =?us-ascii?Q?fG98lKf0XH8Cr32lyHUsOUuOvo4FCmy/6LhY+UFFxy1oLqyyequgmH++FOzk?= =?us-ascii?Q?zkdB1M2NRd5NmlemBC24Gc2Zg9nIUhh97lpUQ34C6rreqKGAWgD+iXSn4zCN?= =?us-ascii?Q?FrBok8X/qT6Z3Y6m7d3rHU8hTtuc5llJco4p/tsTOC3WuiA+unEelSxxvtID?= =?us-ascii?Q?I0/zgSw/IYDBpdlsnRLfPevi2dsIYSJcxNORzJ4ZzqLudfJmFbJTDu5yJgUl?= =?us-ascii?Q?k+14wO4FBgCbrvPzobYTA9OWpvc/OnQQ72Rg1tQ3vimkK0eXMUW2Fch0LZAQ?= =?us-ascii?Q?R0DDRj35L51JHiMyOKRpbMLQu6M7RBHxYXjC+HlMAy1qyVebAc0VOarScYrV?= =?us-ascii?Q?C/Ah+WY8kYCAZVGGXjrMLm5OW7TasCoxgp8UPMj3eBpFmbDNHd/iCK6vKEL/?= =?us-ascii?Q?8f81sBo0GetoeW1vuCv41EtXMoP/bsy7y44hki395j9O4qWtpqgUFOIcZ+oZ?= =?us-ascii?Q?995+9FqENYFTKctqFRbjj5eMc0ruD3iQgEs9C9/KsLaa1a/8QGfeJUNin2mv?= =?us-ascii?Q?FcG8On2M50SptjA1fA87Fyjqqi3zfEcfYmaXr+y3Zmc08O7ZSqphRPggUc0N?= =?us-ascii?Q?vs5ZHbV4g+lCapvcgDt82YcRKrQloQHFTG4onykQeBnX7oTl+sAl1OaVSG02?= =?us-ascii?Q?ybuQmjNufp2bhOifzrEqYJ+B22Xxlv7ZRFpdEgFTjqSMWw/dASeA1R//pGBt?= =?us-ascii?Q?ojPzSrMW6JZBaSM5q9tJgprKTHLyZkzAoXF1jSjJ58EZ/lbszlCxDR4VtP83?= =?us-ascii?Q?PGXBentj9bqJq1bKPasq726V6G9Acrg8JR9L?= 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)(376014)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 May 2025 17:19:27.9548 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 562d4402-4e14-4e98-a84c-08dd9f9e2203 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: DS2PEPF00003443.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB7666 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250530_101933_814393_B86864FC X-CRM114-Status: GOOD ( 13.72 ) 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, May 30, 2025 at 02:10:52PM -0300, Jason Gunthorpe wrote: > On Sat, May 17, 2025 at 08:21:45PM -0700, Nicolin Chen wrote: > > +static inline phys_addr_t > > +arm_smmu_domain_ipa_to_pa(struct arm_smmu_domain *smmu_domain, u64 ipa) > > +{ > > + if (WARN_ON_ONCE(smmu_domain->stage != ARM_SMMU_DOMAIN_S2)) > > + return 0; > > + return iommu_iova_to_phys(&smmu_domain->domain, ipa); > > +} > > It is not allowed to call this function unless you are holding a range > lock on the IOAS that covers ipa, and this path does not. > > This is why it has to go through an access to get the physical as that > has the right locking. OK. It would not be needed either once the core passes in type phys_addr_t as you suggested in the other patch. Thanks Nicolin