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client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF000001F4.mail.protection.outlook.com (10.167.242.72) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9587.10 via Frontend Transport; Sun, 1 Feb 2026 15:55:25 +0000 Received: from satlexmb08.amd.com (10.181.42.217) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Sun, 1 Feb 2026 09:55:18 -0600 Received: from xcbalucerop40x.xilinx.com (10.180.168.240) by satlexmb08.amd.com (10.181.42.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17 via Frontend Transport; Sun, 1 Feb 2026 09:55:17 -0600 From: To: , , , , , , , , CC: Alejandro Lucero , Jonathan Cameron , Davidlohr Bueso , "Ben Cheatham" Subject: [PATCH v23 20/22] cxl: Avoid dax creation for accelerators Date: Sun, 1 Feb 2026 15:54:36 +0000 Message-ID: <20260201155438.2664640-21-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260201155438.2664640-1-alejandro.lucero-palau@amd.com> References: <20260201155438.2664640-1-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: SJ5PEPF000001F4:EE_|SJ5PPFE4FC9FAB3:EE_ X-MS-Office365-Filtering-Correlation-Id: 33ee7ae0-fd94-4e6e-3ef0-08de61aa503d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|1800799024|36860700013|82310400026; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 3x+cX/u8skX+EUto+l0odZVXYAvNAGehVJgmSj9ifwawqZCGQO8+VnauZi8PvYR16dEe98z9KVRxJdKHRihdCs+UGfJ+qcetdMEPx2uElmjys9roDq5QUow+3El0Evg9jnqOkZZZgA5VfGH+aHCVYFC9RM95hntexqhWBeMgi1UqN1ue6xz5iI8f0W8uZnxNdA7b9TbcBqy0d0TU9iGMn7ZQ07bh/QN1COPOB6JATF1jdVkCBx+JMc5fbSnunDkixXe/Tj0ZdcveK+bTgmYx/+ezzYZ/yJiaQHMJORCO56hvbbYcBydlJEuF7C0bKsdvUNFI/VMxlCUvMnsuOqCpLVManqgTIO6XiduZjKkWPIe+XQnA20JJbPyyLI5aQVmFybvUysrAGe/kMYqlnZFv3IHiz25yo6WD1MYQdd+z32aMunxiV1DZ+0+tFM+GHnU9 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Feb 2026 15:55:25.0628 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 33ee7ae0-fd94-4e6e-3ef0-08de61aa503d 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001F4.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPFE4FC9FAB3 From: Alejandro Lucero By definition a type2 cxl device will use the host managed memory for specific functionality, therefore it should not be available to other uses. Signed-off-by: Alejandro Lucero Reviewed-by: Jonathan Cameron Reviewed-by: Davidlohr Bueso Reviewed-by: Dave Jiang Reviewed-by: Ben Cheatham --- drivers/cxl/core/region.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 293e63dfef22..12df717cc881 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -4441,6 +4441,13 @@ static int cxl_region_probe(struct device *dev) if (rc) return rc; + /* + * HDM-D[B] (device-memory) regions have accelerator specific usage. + * Skip device-dax registration. + */ + if (cxlr->type == CXL_DECODER_DEVMEM) + return 0; + /* * From this point on any path that changes the region's state away from * CXL_CONFIG_COMMIT is also responsible for releasing the driver. -- 2.34.1