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Tue, 24 Jun 2025 09:14:44 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" Subject: [PATCH v17 21/22] cxl: Add function for obtaining region range Date: Tue, 24 Jun 2025 15:13:54 +0100 Message-ID: <20250624141355.269056-22-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250624141355.269056-1-alejandro.lucero-palau@amd.com> References: <20250624141355.269056-1-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: SJ1PEPF00001CE7:EE_|CY5PR12MB6346:EE_ X-MS-Office365-Filtering-Correlation-Id: ddad2ab4-203b-4db2-4f0d-08ddb32979f6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?zTgaroIrX6vLes9bbWizLQPa4E0ZTyTuylIfgt4/ny2ZBTLsjpV0CEbzCBhw?= =?us-ascii?Q?8mhNVgp8vAu2lXh3b9N+SZSU1Hl377PWjT8zk6sj8OoqCxO27ohVL1ZPuPWK?= =?us-ascii?Q?vTu9OnPerkps1pYaY47IB7W0NZ+6K6A5J1yjfc57o0SwJhaqPRsNvBOxEu4Q?= =?us-ascii?Q?Fxp+KUsJV//y6LI3nrrBJGJXTDMSS/3ImLnOHvpPL84+BZNVVBsG73jCElyI?= =?us-ascii?Q?kegftSzV9gn73WSsX/0pDsrl4ERdFCtW7XcBxNlz7XIrVx+mcM3SGM2Zy3XH?= =?us-ascii?Q?6ukIJJBmiQi7Pqli5QBhl7sddEFFYuU2++1IMFRkIsSvbr3OZ7JgdNLCxMju?= =?us-ascii?Q?ss8iUv4610YBXI1sCADfMwtTB/jXx1WVsR8/EbCL+IMx/CNrGE/6f46itXf4?= =?us-ascii?Q?s7vborovvLu7BgAh5h+76I27qYVP9qPH4nZ5KTc5UcaB9P+CxMY9un6AyF8c?= =?us-ascii?Q?zHDqZMMn9fMkMel/ryrNZlAyzXIb6l8WIxe9UzhDJAr2j85YaaDVWG9xbVDR?= =?us-ascii?Q?EH4b0+qg1FXbE6s2JiUddMxWYi15RYITXqtFYfAF+78ZE95/vAOVBryGbB/q?= =?us-ascii?Q?qeMGrX7HuWjvSyCvnR3dpQPWWVR8Tz4oiSskk7ooLzuIlsmXZYfEaOKrBJg2?= =?us-ascii?Q?CCsO2i3SInsyLgOvFBZgwY8EoBX2ZM9YnM1YXqS5fjldZLN25fC0cdkZ76UE?= =?us-ascii?Q?vJUI6kNOvqfOa7S3JcU/xrebxTQNoeQVgGZ7kswJg5HMlarh7I8w1fyGM3rs?= =?us-ascii?Q?yZ2gb3GL4fhxT6+9UhmJwYNIRkdSTppnQ8k8vF5Vezz//dbqy23677MGDwnv?= =?us-ascii?Q?KOlg4uF4sT+Qp6Zw5XhBVPl9wMb3MBbYwiJW07yDVltPqS09I0jXmAP9aIX/?= =?us-ascii?Q?Yb9Q8p5YT3iF9KcmgWfDrGRUUbgwgLLWE5bCkZeRoEgRce9DcU4WnHRI0thE?= =?us-ascii?Q?OVIPfp73EJD+0bSIMWCsLKDjtNdtBq4e1FRp7EPfc5ijFErxqDGBpmVQViz+?= =?us-ascii?Q?XB5lWypDCmEGmgZNcOYEhAyQbUCdQMl1NLg1IhHw5AYRGpyxn9+WqOjwEauI?= =?us-ascii?Q?yFT2qkS18DBAuiOiDzE55MdtR2xYI4KWadANvayQyTXUImzE6edS4838q4NS?= =?us-ascii?Q?5Q8WRJvOckZxxKEiyTyTIAyUgwDPQq6W31QXGrOjiekUA1JNjhk4tHq/cJ9j?= =?us-ascii?Q?a+WDNymy4f0HbsEKqm9UamelK1Ymv4kg0anNliB1LZnk6qtRwWfj41qyHxKv?= =?us-ascii?Q?goXD627fEW7iLCiTrEPGIAokZgku0S005ZuE/0D3sgYkYCUtGnWfHUeZ5Z9J?= =?us-ascii?Q?DXKxyU5gyc2c56ezPN6siBiXZ3QTocX8+UYDGgI5vhv20ZDS/z9io8rqO1pj?= =?us-ascii?Q?etoRx9X44Wjn110azZLoALUofObfmSAR2u7nEtJEyFTM9o50lNvWc6rda2Sr?= =?us-ascii?Q?cJgAbhuOVFn3NJIiRXPw0fJ9TW65H+o0P/a9VUoGvxwHqicbKNLXURNDU6h4?= =?us-ascii?Q?fHgaPWi0LEmm78fpZ608ilDOBDq5fZpS51Un?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2025 14:14:47.6428 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ddad2ab4-203b-4db2-4f0d-08ddb32979f6 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE7.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR12MB6346 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 e933e4ebed1c..8c624019bf9b 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2721,6 +2721,29 @@ 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 5067f71143ef..5b4786a412b1 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -257,4 +257,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, int ways, void (*action)(void *), void *data); void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled); +struct range; +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif /* __CXL_CXL_H__ */ -- 2.34.1