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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SJ1PEPF000026C5.mail.protection.outlook.com (10.167.244.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.9052.8 via Frontend Transport; Fri, 22 Aug 2025 03:42:18 +0000 Received: from ethanolx50f7host.amd.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; Thu, 21 Aug 2025 22:42:16 -0500 From: Smita Koralahalli To: , , , , CC: Davidlohr Bueso , Jonathan Cameron , Dave Jiang , "Alison Schofield" , Vishal Verma , Ira Weiny , Dan Williams , Matthew Wilcox , Jan Kara , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , "Ying Huang" , Yao Xingtao , Peter Zijlstra , Greg KH , Nathan Fontenot , Smita Koralahalli , Terry Bowman , Robert Richter , Benjamin Cheatham , PradeepVineshReddy Kodamati , Zhijian Li Subject: [PATCH 3/6] dax/hmem, cxl: Tighten dependencies on DEV_DAX_CXL and dax_hmem Date: Fri, 22 Aug 2025 03:41:59 +0000 Message-ID: <20250822034202.26896-4-Smita.KoralahalliChannabasappa@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250822034202.26896-1-Smita.KoralahalliChannabasappa@amd.com> References: <20250822034202.26896-1-Smita.KoralahalliChannabasappa@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000026C5:EE_|DS0PR12MB7874:EE_ X-MS-Office365-Filtering-Correlation-Id: cd952e4c-7c80-40af-2fa1-08dde12de4cd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|30052699003|36860700013|1800799024|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?j+BxH58AIV0IzVnSzWde204ZhMtXDWdzKsG3LNoLr3G2GHogNohk0WiRuR6u?= =?us-ascii?Q?bK1qQznmjpOwbxvnmkEhaAtxIZkS91ilv5SoI7ARdt7yK7QTfLgr90e9vGWf?= =?us-ascii?Q?aCj1To5SUwRs+v4QD6pbkv/yZsW0mwQO13boga+iIsNVUx9rFxuObbdKhP6b?= =?us-ascii?Q?apdmad3C5Y7b/EkN3j9U7+hQeDe6rEl3dJ8+3CiMeeOxyJJ6Xjk+oils5QgR?= =?us-ascii?Q?/AzuUDK3QLTsRSR0rTR+4A9Q4y9lPhngmJvjGpHCkfkPPjxOlqo1otiLiDvr?= =?us-ascii?Q?X3ZnQwKonRuOrCp+IefaE8MHaHuI7Dz+QrqNL2AxflEuqrTta/8JoHhSBldf?= =?us-ascii?Q?8Jt6kGLSgTmOBbtj8gwXxhzTPLCCIwxem36BbBrNwwSdBk8QzM2qO60R0YhW?= =?us-ascii?Q?DtoiGrRC1jbnCGRHly4TdlWYFFbu+79brbFlfQjQ04CqoUitke5d9eZg0b/3?= =?us-ascii?Q?2zRs6Nw2zKX2xgPAgota0sw2BkDSC9FWoJO5vFXXB509VarX3WrUpez8U9rb?= =?us-ascii?Q?QcsXojGUSYUP8A62VxeCWIBydqHAbyk8oFiUfzd7hL5vj9+FxNZF+/qLG2L3?= =?us-ascii?Q?btao5V8Cgr/4hXH3VujBBhSnmXVn2ua9tW3ASX6RiRvAHdIg8PR2H/nrVnhD?= =?us-ascii?Q?6utJh+gppEFluVYC5fr0IxRrV6o6eTGa6dWzFhjBzBxFVHO/d2R4fLlwAfwx?= =?us-ascii?Q?403SzOc1Y/l7sMvea1lr5ipR4eWgZz9rzoxCcBQF9oXqzqt6mauY3X+91HHh?= =?us-ascii?Q?HnITAPlN0EbcCS9tC4Kz+NDGT2CtsecbdT791TyzWGwg3ZuUEgokVwBKYBJN?= =?us-ascii?Q?YlIIk9JTx/9/j8zlF4w3zP+wlwJaYxIAy2Um+2xEX0Z3tpS6xGqshGMb4GyX?= =?us-ascii?Q?HMrg8zAxxTnTxiuqVvHNZr33N60twRdxQCtkKZq+D3UhJ+h0dBR0cidQW7BR?= =?us-ascii?Q?VL/hXgNMSQJzH7siQuVtmLkoH1lJCQyP++zaoF6s2fi/rWX1s1iuN5icvhbT?= =?us-ascii?Q?Qb69DQp/JP35wr3Xh/c7kv9dbKA+j+alyb6NNyNCe2oyqOM+edavqzX/lUSn?= =?us-ascii?Q?3p1d0L7W1V9SKAFEf7e4Zjy4q1pdo3nncKO8ooMN1RvAXldfUUnHlzPfNb+7?= =?us-ascii?Q?4QeZSZm3rmnUil2uHB86rZsmIHzVjZVbUx1pKCZRgV6YOruToeFGbBHiQV9B?= =?us-ascii?Q?X+WMjovVXdHtWcU9fL2p7IcYtsz6Ce8yIL5HKB6Sb4uDG3XiNgQ6pzyi6bKH?= =?us-ascii?Q?CTGjh9jJN72ky+8s4tSyDKpFzm//ZLSnpxqOhjRLn+e2tdxrJmUDb5W+sbnk?= =?us-ascii?Q?Vo5CM6UrU3b3DHj7oF1a92V0ogyRkBCL3FHcVr5QUreINNfuSbbB+F/u9rau?= =?us-ascii?Q?V1AVryc5QmmmYBzlFNBAoZkpenlvppE1k6xvuXk8NVA0e6i0iXx5DZJpmQqk?= =?us-ascii?Q?ykdtiFrm4EnmKb5+NkC34eGUqRTT9mvaoONoR4XW75n//afqMz5xgKmvosUV?= =?us-ascii?Q?W+NHH3tE7pOfx0iBC/pGountslIZXvBC9Vvs?= 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)(30052699003)(36860700013)(1800799024)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2025 03:42:18.3552 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cd952e4c-7c80-40af-2fa1-08dde12de4cd 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: SJ1PEPF000026C5.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7874 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update Kconfig and runtime checks to better coordinate dax_cxl and dax_hmem registration. Add explicit Kconfig ordering so that CXL_ACPI and CXL_PCI must be initialized before DEV_DAX_HMEM. This prevents dax_hmem from consuming Soft Reserved ranges before CXL drivers have had a chance to claim them. Replace IS_ENABLED(CONFIG_CXL_REGION) with IS_ENABLED(CONFIG_DEV_DAX_CXL) so the code more precisely reflects when CXL-specific DAX coordination is expected. This ensures that ownership of Soft Reserved ranges is consistently handed off to the CXL stack when DEV_DAX_CXL is configured. Signed-off-by: Smita Koralahalli Signed-off-by: Dan Williams --- drivers/dax/Kconfig | 2 ++ drivers/dax/hmem/hmem.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig index d656e4c0eb84..3683bb3f2311 100644 --- a/drivers/dax/Kconfig +++ b/drivers/dax/Kconfig @@ -48,6 +48,8 @@ config DEV_DAX_CXL tristate "CXL DAX: direct access to CXL RAM regions" depends on CXL_BUS && CXL_REGION && DEV_DAX default CXL_REGION && DEV_DAX + depends on CXL_ACPI >=3D DEV_DAX_HMEM + depends on CXL_PCI >=3D DEV_DAX_HMEM help CXL RAM regions are either mapped by platform-firmware and published in the initial system-memory map as "System RAM", mapped diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 9277e5ea0019..7ada820cb177 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -66,7 +66,7 @@ static int hmem_register_device(struct device *host, int = target_nid, long id; int rc; =20 - if (IS_ENABLED(CONFIG_CXL_REGION) && + if (IS_ENABLED(CONFIG_DEV_DAX_CXL) && region_intersects(res->start, resource_size(res), IORESOURCE_MEM, IORES_DESC_CXL) !=3D REGION_DISJOINT) { dev_dbg(host, "deferring range to CXL: %pr\n", res); --=20 2.17.1