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Fri, 5 Dec 2025 03:53:14 -0800 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" Subject: [PATCH v22 12/25] cxl: Add function for obtaining region range Date: Fri, 5 Dec 2025 11:52:35 +0000 Message-ID: <20251205115248.772945-13-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251205115248.772945-1-alejandro.lucero-palau@amd.com> References: <20251205115248.772945-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015CD:EE_|SA1PR12MB7294:EE_ X-MS-Office365-Filtering-Correlation-Id: da5460ce-3c1f-4994-d250-08de33f4e053 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?CCzkwSAFe+/bgR9ENONl9WmgWNBQPCaXNwxJ464/TARsfohAbiPLZNezrpaY?= =?us-ascii?Q?ZhdMpvibxSBl6CeaFTMwadmbWgS4Cpfh6wt4+3yWQ8thkrutnvX+O0zdxzka?= =?us-ascii?Q?9I0vanY+024H+fU6DVc9c93bEzbR8hZTrni/J8LJJU00G2rcxAODzPEPw8v1?= =?us-ascii?Q?7InfqJL96o5O8N/7DsAML2Q7j/l0vx2HOSdQO6L4ku0MLJQDM0proZDlco1u?= =?us-ascii?Q?JG5jzXzPa1EkPmgkQKLMUgSQI1v3+VKIZuhvOIHdUe8PpAzgpnJLe2Q8/B0R?= =?us-ascii?Q?J03tZpE+cXySJyRYCH1w1bPFiL3AiItQSG9q2MPm/tr1G2DUPZMfRMYMI7uR?= =?us-ascii?Q?0W41Lj424Apy1jfpxiS/7aK2RQNT82fFlBvR3gkN47xeVCFA6ceiAWOCi+Zf?= =?us-ascii?Q?DgEQadQ6bZp5nHtHk+n/9jTvFWsAvZ9t/gvYWvpPd3Qr+NLFH7yAuXbVyud6?= =?us-ascii?Q?BngXeuQHA7O0JYdoe6xJQBCoP0Zxdbks6E7Bm5+4lTcOmaleBzzq27pcanTY?= =?us-ascii?Q?bVn323ywXmgC/GdCRPY1SAZ5IBBPkhEO4jzcoiLClsBG+PBs2NFcxvP+bu/v?= =?us-ascii?Q?wuLtFqTiJTJyXNgQcm1oMEfuhq0zSQ7smT6crJH5CbGPEIxQrz402tVKqBPd?= =?us-ascii?Q?fqRQ4Zd/g8dD2wH8Pr10DNupDdFRDLRML9S751DM1FcIGX2RAU8cDwbNqRa9?= =?us-ascii?Q?p+DJaXz8uLcYJAUl/LWFK4kjBSgAa+CJ73jJQ/jKbupzp23iLOdgZxqumpqH?= =?us-ascii?Q?lp67YKc9W/VGmioWA7esC9QH0IKZMst3hEfbD+UVDbNNWySezhUw+Wi2r78v?= =?us-ascii?Q?K2XmtCCJTpagibf1b9h9Onp99SttuPT2GlPEkmLxYGyElhllf/fFgNyTOp9w?= =?us-ascii?Q?m51mTMPY+4E8hv4uIxfy4qq8h55GfsVUeecMAnxOk0fnmG3gJWJm1G6X/h2N?= =?us-ascii?Q?kFLXtLkaYS3WP15kxGZDZDX9Esl8xGld94FDkZaNx06ArjMpXKdsDzwtNCWb?= =?us-ascii?Q?TsxMeny6oMsushbNg4oJolM7MXepwGkBvZCniSU6IS0GCQsOYS3Pe+5qG3Pz?= =?us-ascii?Q?OgGrJcMN7H59CY6hc0aMDtKxkpHu0pe7jvALJxrewZg3dqP6dVYlQrIglfNA?= =?us-ascii?Q?qNKsF2Y9z9LazuYgOGUl/3ZepYgSODBg1R1P0XgzcWNWbYQx9ZCsFhkdjRi3?= =?us-ascii?Q?vDxZy6QeBJWWNSc0JlYIInTO0EOINyOPLVPLkS00SXZ5GqDjSoGtuFYnT+F3?= =?us-ascii?Q?w8QHCjhlfAZQDTFw4Fj6n0cZpsg2iql446SuS+yUyp7+khEUTjoROYxSnlgq?= =?us-ascii?Q?V+dJWaMOsVFJhm1i22Ry/Om3lAtjEEqvAjuvUDEMHFQ2N2IxEDVDFdQeQFAB?= =?us-ascii?Q?jvlJkedpnR0ik5l/5K9in965pyV3KObCM/MB7sjsPCtWP/x96jGswXGfdaF4?= =?us-ascii?Q?FLpzPMFuLL0tv6X/HImgkbILc4nHPGNWqZFh/2xp4su1bpP1biLcMw3+bz7Q?= =?us-ascii?Q?0+VtWbqt4EICsE7kIXsO/AJQeyTKKuUTiz1ip8g5JIjMJaXiF4F4g9jeAXMq?= =?us-ascii?Q?45oVFtTOiJW6sUWu/6w=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb08.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2025 11:53:16.1158 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da5460ce-3c1f-4994-d250-08de33f4e053 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb08.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CD.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7294 From: Alejandro Lucero A CXL region struct contains the physical address to work with. Type2 drivers can create a CXL region but have not access to the related struct as it is defined as private by the kernel CXL core. Add a function for getting the cxl region range to be used for mapping such memory range by a Type2 driver. Signed-off-by: Alejandro Lucero Reviewed-by: Zhi Wang Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang --- drivers/cxl/core/region.c | 23 +++++++++++++++++++++++ include/cxl/cxl.h | 2 ++ 2 files changed, 25 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index b06fee1978ba..8166a402373e 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2575,6 +2575,29 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(rc); } +/** + * cxl_get_region_range - obtain range linked to a CXL region + * + * @region: a pointer to struct cxl_region + * @range: a pointer to a struct range to be set + * + * Returns 0 or error. + */ +int cxl_get_region_range(struct cxl_region *region, struct range *range) +{ + if (WARN_ON_ONCE(!region)) + return -ENODEV; + + if (!region->params.res) + return -ENOSPC; + + range->start = region->params.res->start; + range->end = region->params.res->end; + + return 0; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_region_range, "CXL"); + static ssize_t __create_region_show(struct cxl_root_decoder *cxlrd, char *buf) { return sysfs_emit(buf, "region%u\n", atomic_read(&cxlrd->region_id)); diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 2ff3c19c684c..f02dd817b40f 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -253,4 +253,6 @@ struct cxl_memdev *devm_cxl_add_memdev(struct device *host, struct cxl_region; struct cxl_endpoint_decoder *cxl_get_committed_decoder(struct cxl_memdev *cxlmd, struct cxl_region **cxlr); +struct range; +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif /* __CXL_CXL_H__ */ -- 2.34.1