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Mon, 14 Apr 2025 10:14:13 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Zhi Wang , "Jonathan Cameron" , Ben Cheatham Subject: [PATCH v13 19/22] cxl: add region flag for precluding a device memory to be used for dax Date: Mon, 14 Apr 2025 16:13:33 +0100 Message-ID: <20250414151336.3852990-20-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250414151336.3852990-1-alejandro.lucero-palau@amd.com> References: <20250414151336.3852990-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EDD1:EE_|IA0PR12MB8981:EE_ X-MS-Office365-Filtering-Correlation-Id: f9a0564c-37e0-4097-e275-08dd7b670671 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|36860700013|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(7416014)(1800799024)(376014)(36860700013)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Apr 2025 15:14:17.4890 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f9a0564c-37e0-4097-e275-08dd7b670671 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: CY4PEPF0000EDD1.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8981 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. However, a dax interface could be just good enough in some cases. Add a flag to a cxl region for specifically state to not create a dax device. Allow a Type2 driver to set that flag at region creation time. Signed-off-by: Alejandro Lucero Reviewed-by: Zhi Wang Reviewed-by: Jonathan Cameron Reviewed-by: Ben Cheatham Reviewed-by: Dave Jiang --- drivers/cxl/core/region.c | 10 +++++++++- drivers/cxl/cxl.h | 3 +++ include/cxl/cxl.h | 3 ++- 3 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index f55fb253ecde..cec168a26efb 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3649,12 +3649,14 @@ __construct_new_region(struct cxl_root_decoder *cxlrd, * @cxlrd: root decoder to allocate HPA * @cxled: endpoint decoder with reserved DPA capacity * @ways: interleave ways required + * @no_dax: if true no DAX device should be created * * Returns a fully formed region in the commit state and attached to the * cxl_region driver. */ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled, int ways) + struct cxl_endpoint_decoder *cxled, int ways, + bool no_dax) { struct cxl_region *cxlr; @@ -3670,6 +3672,9 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, return ERR_PTR(-ENODEV); } + if (no_dax) + set_bit(CXL_REGION_F_NO_DAX, &cxlr->flags); + return cxlr; } EXPORT_SYMBOL_NS_GPL(cxl_create_region, "CXL"); @@ -3833,6 +3838,9 @@ static int cxl_region_probe(struct device *dev) if (rc) return rc; + if (test_bit(CXL_REGION_F_NO_DAX, &cxlr->flags)) + return 0; + switch (cxlr->mode) { case CXL_PARTMODE_PMEM: return devm_cxl_add_pmem_region(cxlr); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index c35620c24c8f..2eb927c9229c 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -405,6 +405,9 @@ struct cxl_region_params { */ #define CXL_REGION_F_NEEDS_RESET 1 +/* Allow Type2 drivers to specify if a dax region should not be created. */ +#define CXL_REGION_F_NO_DAX 2 + /** * struct cxl_region - CXL region * @dev: This region's device diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 21cb39dcee9e..0a5d97d5a6bb 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -267,7 +267,8 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd, resource_size_t alloc); int cxl_dpa_free(struct cxl_endpoint_decoder *cxled); struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled, int ways); + struct cxl_endpoint_decoder *cxled, int ways, + bool no_dax); int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); #endif /* __CXL_CXL_H__ */