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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 CH3PEPF0000000F.mail.protection.outlook.com (10.167.244.40) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9745.21 via Frontend Transport; Mon, 30 Mar 2026 14:38:51 +0000 Received: from satlexmb07.amd.com (10.181.42.216) 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; Mon, 30 Mar 2026 09:38:50 -0500 Received: from xcbalucerop40x.xilinx.com (10.180.168.240) 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 via Frontend Transport; Mon, 30 Mar 2026 09:38:49 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Jonathan Cameron , Davidlohr Bueso , "Ben Cheatham" Subject: [PATCH v25 10/11] cxl: Avoid dax creation for accelerators Date: Mon, 30 Mar 2026 15:38:26 +0100 Message-ID: <20260330143827.1278677-11-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 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF0000000F:EE_|DM4PR12MB7647:EE_ X-MS-Office365-Filtering-Correlation-Id: 71df897c-43a2-407d-89cc-08de8e6a0f9e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|7416014|22082099003|18002099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 9JdQfpncuLxMWZzJ6BrKVLZNwRjX+lox19YNpAbRPHpd3i8rk7uCLgSrvTq+N1WCyLkBG2HrWhthy6YoH4wy2cmXcq4hLncpHD1YcyS0iqwrY8Ed+aFKpHLk1X+tXK4LTLH39VG77wFeLRvILfmIHiA92vCG0DYHdKfVZH+Y8/G9ou+zDyE2XnH081J9n3Pgl4dpN5ARB5Y2Rl2JitNlS1FdWcRYRO2wJNtNsZOuCtRYV+0epf7kK1PFNFn11V0PMG22Kc/bKF9XGL0FkaNTDX2fmnH9KUzW2pqyqqeTZCkAdNJnUHp4WdZdFstmLmiscAhQa9IgmGyByLnCG/XSoFU7spbGAfJmck1IlWAEBZwthb5Iqg7AwN8WxI4Sb0plgZaYOL9Iw3hFU0y3KYjI+RQBcrn1t360ULB48IhSHtKT+dAcHM0BbT/AxPw4RwIF X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2026 14:38:51.2343 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 71df897c-43a2-407d-89cc-08de8e6a0f9e 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: CH3PEPF0000000F.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7647 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 like DAX. 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 b3a6d08be461..6a89a1817199 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -4264,6 +4264,13 @@ 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