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Thu, 17 Apr 2025 16:30:06 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" Subject: [PATCH v14 21/22] cxl: add function for obtaining region range Date: Thu, 17 Apr 2025 22:29:24 +0100 Message-ID: <20250417212926.1343268-22-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250417212926.1343268-1-alejandro.lucero-palau@amd.com> References: <20250417212926.1343268-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Received-SPF: None (SATLEXMB05.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EE33:EE_|DM4PR12MB6568:EE_ X-MS-Office365-Filtering-Correlation-Id: 81a8e602-c0a9-4dc8-cf9a-08dd7df7084e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|1800799024|7416014|36860700013; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Apr 2025 21:30:10.5006 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81a8e602-c0a9-4dc8-cf9a-08dd7df7084e 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: CY4PEPF0000EE33.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6568 From: Alejandro Lucero A CXL region struct contains the physical address to work with. Add a function for getting the cxl region range to be used for mapping such memory range. Signed-off-by: Alejandro Lucero Reviewed-by: Zhi Wang Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang --- drivers/cxl/core/region.c | 15 +++++++++++++++ include/cxl/cxl.h | 2 ++ 2 files changed, 17 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index cec168a26efb..253ec4e384a6 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2717,6 +2717,21 @@ static struct cxl_region *devm_cxl_add_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(rc); } +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 5d30d775966b..2adc21e8ad44 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -271,4 +271,6 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, bool no_dax); int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); +struct range; +int cxl_get_region_range(struct cxl_region *region, struct range *range); #endif /* __CXL_CXL_H__ */