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client-ip=165.204.84.17; helo=satlexmb08.amd.com; pr=C Received: from satlexmb08.amd.com (165.204.84.17) by CY4PEPF0000EDD3.mail.protection.outlook.com (10.167.241.199) 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 15:55:00 +0000 Received: from satlexmb08.amd.com (10.181.42.217) 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; Sun, 1 Feb 2026 09:54:59 -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 09:54:58 -0600 From: To: , , , , , , , , CC: Alejandro Lucero Subject: [PATCH v23 08/22] cxl/hdm: Add support for getting region from committed decoder Date: Sun, 1 Feb 2026 15:54:24 +0000 Message-ID: <20260201155438.2664640-9-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: CY4PEPF0000EDD3:EE_|MN2PR12MB4046:EE_ X-MS-Office365-Filtering-Correlation-Id: babf7e4f-1b06-4746-c16c-08de61aa4188 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|82310400026|36860700013; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 1c0Ri+HOXS0thtAZlS0q12IHJd4cIAC9Q1dlIkcDxIVqh1brtYm6exHgqn4hhqUZtdxl4s75auMULDMJ82JLla68cGn3cYN/1h9ebNxVDuFivWYFnCNzmnUKA5L1jVgvG5H+nXNzmqDVsvH6FClK7SmYW+MB1YJj2QwixsuTdNA9z5JBgPcHP8b3UZSrmecEHm98UHRSUJWcuwCkN1qGqAhrF/hoWEm4k7JADTPL63oOPahF94yWkX4A3jwbOxe0e+cCdQgGLy0TUZHTyusfRL+kSIP4p593G+5AN/zJT2Tusyj7pe5uupT7JXz3yiZ1e2yNaoX6b/RAH5eJaFMjdnXeiYhRs8m17pKTivgt7SJgd9Pri8xLKELJSnDeNJYxq81IIzCzljfnpdL3wI4Z21Nu2Wcal2CgiUvO9IEiaRNiR4Fpm7nLT3nuRyPIOseW X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Feb 2026 15:55:00.4132 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: babf7e4f-1b06-4746-c16c-08de61aa4188 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: CY4PEPF0000EDD3.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4046 From: Alejandro Lucero A Type2 device configured by the BIOS can already have its HDM committed. Add a cxl_get_committed_decoder() function for cheking so after memdev creation. A CXL region should have been created during memdev initialization, therefore a Type2 driver can ask for such a region for working with the HPA. If the HDM is not committed, a Type2 driver will create the region after obtaining proper HPA and DPA space. Signed-off-by: Alejandro Lucero --- drivers/cxl/core/hdm.c | 39 +++++++++++++++++++++++++++++++++++++++ include/cxl/cxl.h | 3 +++ 2 files changed, 42 insertions(+) diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 6e516c69b2d2..a172ce4e9b19 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -686,6 +686,45 @@ int cxl_dpa_alloc(struct cxl_endpoint_decoder *cxled, u64 size) return devm_add_action_or_reset(&port->dev, cxl_dpa_release, cxled); } +static int find_committed_endpoint_decoder(struct device *dev, const void *data) +{ + struct cxl_endpoint_decoder *cxled; + struct cxl_port *port; + + if (!is_endpoint_decoder(dev)) + return 0; + + cxled = to_cxl_endpoint_decoder(dev); + port = cxled_to_port(cxled); + + return cxled->cxld.id == port->hdm_end; +} + +struct cxl_endpoint_decoder *cxl_get_committed_decoder(struct cxl_memdev *cxlmd, + struct cxl_region **cxlr) +{ + struct cxl_port *endpoint = cxlmd->endpoint; + struct cxl_endpoint_decoder *cxled; + struct device *cxled_dev; + + if (!endpoint) + return NULL; + + guard(rwsem_read)(&cxl_rwsem.dpa); + cxled_dev = device_find_child(&endpoint->dev, NULL, + find_committed_endpoint_decoder); + + if (!cxled_dev) + return NULL; + + cxled = to_cxl_endpoint_decoder(cxled_dev); + *cxlr = cxled->cxld.region; + + put_device(cxled_dev); + return cxled; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_committed_decoder, "CXL"); + static void cxld_set_interleave(struct cxl_decoder *cxld, u32 *ctrl) { u16 eig; diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 6f8d365067af..928276dba952 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -249,4 +249,7 @@ int cxl_map_component_regs(const struct cxl_register_map *map, int cxl_set_capacity(struct cxl_dev_state *cxlds, u64 capacity); struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds, const struct cxl_memdev_attach *attach); +struct cxl_region; +struct cxl_endpoint_decoder *cxl_get_committed_decoder(struct cxl_memdev *cxlmd, + struct cxl_region **cxlr); #endif /* __CXL_CXL_H__ */ -- 2.34.1