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Mon, 30 Mar 2026 09:38:45 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" , Ben Cheatham Subject: [PATCH v25 07/11] cxl: Add function for obtaining region range Date: Mon, 30 Mar 2026 15:38:23 +0100 Message-ID: <20260330143827.1278677-8-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260330143827.1278677-1-alejandro.lucero-palau@amd.com> References: <20260330143827.1278677-1-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 Received-SPF: None (SATLEXMB04.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000A672F:EE_|CY3PR12MB9607:EE_ X-MS-Office365-Filtering-Correlation-Id: 7b25b061-e127-443a-b07e-08de8e6a0ec0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|36860700016|376014|82310400026|1800799024|22082099003|18002099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 8Jw4c8fESCtrZYfLfLOLFtoYc4ad7nPCd88ufcM8K+MBCsg4yUsRlL/X/t9QehQaHWmev8OYmVhy13wu/P0kbI1weBazkbwiBDR26ylBZA/R2NYHPSsJth0xQfkuvRgyhbgvAPdoyVxTvJ6idI5HvYWjrxXhbiglvngdxAfulIrFSbLEssHBOTo2KQE+Xl7BobAeFQYnEim3wmH7vUuBXaAWA/yX6iPrA2XltHGTO2nbMH17EkWxakiWJ/JuRBRCawBFJ2gAzyPlqXc0ZqJP3AjCjtBChIAYr2lR5fgM9ekW3vb0u5uMqaSwfoGB+AezDpa9DH/jnOs1PIon5t/ORiNYGjIAMMbV27VCmrssowXtBqeu4spw+E7x6XQClD9Py+5LXF+/2c84n6J3mw9EjcOTMsoIX4DpjXuSPwJqSDfFUmmqyRVr8Hpxv2KzTpKe X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2026 14:38:49.6940 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7b25b061-e127-443a-b07e-08de8e6a0ec0 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: MWH0EPF000A672F.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY3PR12MB9607 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 Reviewed-by: Ben Cheatham --- 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 3edb5703d6de..9c3ba911d865 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2655,6 +2655,29 @@ 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 05c6ff2404b0..aa3cf8509b41 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -233,4 +233,6 @@ struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds, const struct cxl_memdev_attach *attach); struct cxl_region; struct cxl_region *cxl_get_region_from_committed_decoder(struct cxl_memdev *cxlmd); +struct range; +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif /* __CXL_CXL_H__ */ -- 2.34.1