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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.12 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.12; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.12) by SJ1PEPF00002327.mail.protection.outlook.com (10.167.242.90) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8158.14 via Frontend Transport; Mon, 18 Nov 2024 16:45:20 +0000 Received: from SATLEXMB04.amd.com (10.181.40.145) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Mon, 18 Nov 2024 10:45:17 -0600 Received: from xcbalucerop41x.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39 via Frontend Transport; Mon, 18 Nov 2024 10:45:16 -0600 From: To: , , , , , , , , CC: Alejandro Lucero Subject: [PATCH v5 24/27] cxl: add region flag for precluding a device memory to be used for dax Date: Mon, 18 Nov 2024 16:44:31 +0000 Message-ID: <20241118164434.7551-25-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20241118164434.7551-1-alejandro.lucero-palau@amd.com> References: <20241118164434.7551-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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: SJ1PEPF00002327:EE_|BL1PR12MB5900:EE_ X-MS-Office365-Filtering-Correlation-Id: c8ec073c-84ac-44f9-0b56-08dd07f06401 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700013|82310400026; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Nov 2024 16:45:20.5938 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c8ec073c-84ac-44f9-0b56-08dd07f06401 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.12];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00002327.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5900 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 --- drivers/cxl/core/region.c | 10 +++++++++- drivers/cxl/cxl.h | 3 +++ drivers/cxl/cxlmem.h | 3 ++- include/cxl/cxl.h | 3 ++- 4 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 70549d42c2e3..eff3ad788077 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3558,7 +3558,8 @@ __construct_new_region(struct cxl_root_decoder *cxlrd, * cxl_region driver. */ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled) + struct cxl_endpoint_decoder *cxled, + bool avoid_dax) { struct cxl_region *cxlr; @@ -3574,6 +3575,10 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, drop_region(cxlr); return ERR_PTR(-ENODEV); } + + if (avoid_dax) + set_bit(CXL_REGION_F_AVOID_DAX, &cxlr->flags); + return cxlr; } EXPORT_SYMBOL_NS_GPL(cxl_create_region, CXL); @@ -3713,6 +3718,9 @@ static int cxl_region_probe(struct device *dev) case CXL_DECODER_PMEM: return devm_cxl_add_pmem_region(cxlr); case CXL_DECODER_RAM: + if (test_bit(CXL_REGION_F_AVOID_DAX, &cxlr->flags)) + return 0; + /* * The region can not be manged by CXL if any portion of * it is already online as 'System RAM' diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 1e0e797b9303..ee3385db5663 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -512,6 +512,9 @@ 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_AVOID_DAX 2 + /** * struct cxl_region - CXL region * @dev: This region's device diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 9d874f1cb3bf..cc2e2a295f3d 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -875,5 +875,6 @@ struct seq_file; struct dentry *cxl_debugfs_create_dir(const char *dir); void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds); struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled); + struct cxl_endpoint_decoder *cxled, + bool avoid_dax); #endif /* __CXL_MEM_H__ */ diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index d295af4f5f9e..2a8ebabfc1dd 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -73,7 +73,8 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd, resource_size_t max); 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); + struct cxl_endpoint_decoder *cxled, + bool avoid_dax); int cxl_accel_region_detach(struct cxl_endpoint_decoder *cxled); #endif