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Mon, 28 Apr 2025 15:12:30 -0700 Date: Mon, 28 Apr 2025 15:12:29 -0700 From: Nicolin Chen To: Pranjal Shrivastava CC: , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v2 08/22] iommufd: Abstract iopt_pin_pages and iopt_unpin_pages helpers Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D1:EE_|SN7PR12MB7979:EE_ X-MS-Office365-Filtering-Correlation-Id: bef927fe-e002-4840-107b-08dd86a1ce6c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|376014|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?7Pri3Y6tUQF1pKdLr8WDSB2EaBja4FRMGBvOnrjvtygxdq0gc7Ivi2HWhS/x?= =?us-ascii?Q?qn9k7S6ddLJDkZJRx0SeLJQ8qT62g3V5wrdIb7bfTBJcTMH3crDmtlUyXOWi?= =?us-ascii?Q?ZE7xhWtpHxJVnl0xWVWWIqXR2q/LYSP2bubgvwvu2FPAEdJCuEaRhZ9UcEBP?= =?us-ascii?Q?ryzA4FziR+6T6fPaRVGTodRNLVk/8eEUDkFks+0rhaSwVdS1peM7aD7DnzAB?= =?us-ascii?Q?DjaQiU3oW0MPMmJGMsbo7WVR3GpMn9IzuE5wihIv/ESE3162ju6wTbYwsNRe?= =?us-ascii?Q?CmIBcL8AMXHWswVq+iMgcf2KCFw4ehmSeVRfaGb1Teo7QY6PvKN/R5JTYja0?= =?us-ascii?Q?y6jr/nNyfzwQU8KqWzxlGP6BLDDCi2dwc3wA/zY5jsKCcvdAe9IYxnFl3ATk?= =?us-ascii?Q?wRrAUZOKjbhyXh7JsMJXn3dckTDbX6I3QzMiTHfV8AXaodMIYvvey+jFVYDN?= =?us-ascii?Q?cK2PNW4Rz0Pigdj3/lIp6zcX+1H1AneVlcWeSu4fi6sMVNdQkRZae18FtyYJ?= =?us-ascii?Q?+d0whIQkdT/OhRgRpVuQg1JFbSyFt6cXaq9l8qq4O/bCN7kqb2XbBPMVWMYh?= =?us-ascii?Q?ChMEGiiZtyA40C6uFvFHft37WooOvKGVn9Ih8jk+THrmTWUGHrKjpNZxxbEQ?= =?us-ascii?Q?M1CH42rSner+ufmija88ujYJaFfwLEdyjJFDcLwdBuw6Thl8ddKRWC9v61Bw?= =?us-ascii?Q?V9Oi1Y01B1HgL2BiZtBgxf7pn9FV6i4Fg8lxWnGXp8MG3B2lp16ULyw1zWzT?= =?us-ascii?Q?K2zWP91A/IWYB9Z6YSflSLGJ2/oT16RQM9GbFGz0Ot70Nw40aLUUp9OTUx51?= =?us-ascii?Q?t/Ic4+rTRT56JdPRxMW2mz1NqI5ld8iuPSz84CPq84dps5GQnj5VbQymttMl?= =?us-ascii?Q?uS4bnNBCRaL0bN6fXhoTxNx/jtD+lqc0KXB9/HBDf/zAMO60/C+FgCSzEnvW?= =?us-ascii?Q?Zb1h+s8Mqdz7ys/O1pqi71yvJimD9butx/pArTZMcWKcem1Ugz09Fy8X8Zks?= =?us-ascii?Q?izFPHW+5tY4r//fZmAuhJ5arqTsJ9HMiNrKKyAePGL46ijezybTSFARjdD3p?= =?us-ascii?Q?pMP4h4QqbCEHWWgUCAeTYPr5++Yxzrne8BNbG0+gVIVtrKqYVWgVU+CH0PRO?= =?us-ascii?Q?2IGUId2JrUQTjgvpyW1rQsuTN/py7Ly6YB2mg2QpVY5E93qhF0LlzQKB+nTx?= =?us-ascii?Q?zvHNhl9hKUk/9bZyydBs7AD1k67kT3Q/Sp4q/De7p+cHKvdOimBvMjmhV2u8?= =?us-ascii?Q?A18KBEMcTJhAAmF6IBN53h5Hx8nS5nCsfGhmt9pmw+ZaJPxrUb1yBH2D3pH8?= =?us-ascii?Q?2H9PSlKBEx8RF5vNQgBzgjHwfiOLsLcT0UWLjBkbndYwnb9EhlIwupxFzpbn?= =?us-ascii?Q?hBt8ZtTcVjMR62RWMnLk50PiqGMwimZnVc8If73TzgTLoXeS6CpoTvL5j1Wc?= =?us-ascii?Q?YhYmRLIvF7mH1Ir1f3jt0mdGED21po4JDPI41hS6A/ypQBdnumXeITYppVmV?= =?us-ascii?Q?/1vMn0saU6NQOmZW+uSTRCyQ5B6cNM7Mt6uC?= 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)(1800799024)(82310400026)(36860700013)(376014)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Apr 2025 22:12:46.6937 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bef927fe-e002-4840-107b-08dd86a1ce6c 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: SJ5PEPF000001D1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7979 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250428_151253_196004_5A8EDAE7 X-CRM114-Status: GOOD ( 11.02 ) 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, Apr 28, 2025 at 08:14:19PM +0000, Pranjal Shrivastava wrote: > On Fri, Apr 25, 2025 at 10:58:03PM -0700, Nicolin Chen wrote: > > + iopt_for_each_contig_area(&iter, area, iopt, iova, last_iova) { > > + unsigned long last = min(last_iova, iopt_area_last_iova(area)); > > + unsigned long last_index = iopt_area_iova_to_index(area, last); > > + unsigned long index = > > + iopt_area_iova_to_index(area, iter.cur_iova); > > + > > + if (area->prevent_access || > > Nit: > Shouldn't we return -EBUSY or something if (area->prevent_access == 1) ? > IIUC, this just means that an unmap attempt is in progress, hence avoid > accessing the area. Maybe. But this is what it was. So we need a different patch to change that. Thanks Nicolin