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Fri, 5 Dec 2025 03:53:31 -0800 From: To: , , , , , , , , CC: Alejandro Lucero , Jonathan Cameron , Davidlohr Bueso , "Ben Cheatham" Subject: [PATCH v22 23/25] cxl: Avoid dax creation for accelerators Date: Fri, 5 Dec 2025 11:52:46 +0000 Message-ID: <20251205115248.772945-24-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20251205115248.772945-1-alejandro.lucero-palau@amd.com> References: <20251205115248.772945-1-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: SA2PEPF000015CC:EE_|BN7PPF28614436A:EE_ X-MS-Office365-Filtering-Correlation-Id: 1af6515d-dac0-4afd-49ad-08de33f4eac7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014|7416014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Dec 2025 11:53:33.6513 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1af6515d-dac0-4afd-49ad-08de33f4eac7 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: SA2PEPF000015CC.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PPF28614436A 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 694bb1e543cc..4d37561c07b2 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -4116,6 +4116,13 @@ 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