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b=u8eFXGu728dAUaOFNWtwpiL4lZwWejKG5GpYb7f6egsU/lD1+S9vZnRorXV+2IYDuizJSMgcTU86TrcXKuaiuJMLp4uwdKn5G5cWAEnxHo4lUvf/K3jorcZ1sbQX4suScNDrmbldOnLGgMabIA6oE9GhtoPyD0lCqE6p+eR5F1k= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from PH7PR12MB5805.namprd12.prod.outlook.com (2603:10b6:510:1d1::13) by MW4PR12MB7381.namprd12.prod.outlook.com (2603:10b6:303:223::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8230.11; Thu, 12 Dec 2024 01:02:46 +0000 Received: from PH7PR12MB5805.namprd12.prod.outlook.com ([fe80::11c7:4914:62f4:f4a3]) by PH7PR12MB5805.namprd12.prod.outlook.com ([fe80::11c7:4914:62f4:f4a3%4]) with mapi id 15.20.8251.008; Thu, 12 Dec 2024 01:02:46 +0000 Message-ID: <5b45ac9a-255c-4c74-8231-bc91c87cc0aa@amd.com> Date: Thu, 12 Dec 2024 06:32:34 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] resource: Fix CXL node not populated issue To: Bharata B Rao , Dan Williams , linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org Cc: Andrew Morton , David Hildenbrand , Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Ira Weiny , Alistair Popple , Andy Shevchenko , Bjorn Helgaas , Baoquan He , ilpo.jarvinen@linux.intel.com, Mika Westerberg , Fontenot Nathan , Wei Huang , regressions@lists.linux.dev, "Huang, Ying" References: <20241202111941.2636613-1-raghavendra.kt@amd.com> <674fd2b4942f1_3e0f629420@dwillia2-mobl3.amr.corp.intel.com.notmuch> <33b4b93b-5ab6-4a3b-b3b2-c9b3cbc9d929@amd.com> <6752acd92baf0_10a08329424@dwillia2-xfh.jf.intel.com.notmuch> <2b5bb8d8-6a7d-4a58-bde7-ce42d0a23f61@amd.com> <675918b414c17_10a0832943b@dwillia2-xfh.jf.intel.com.notmuch> <67594f90a7b87_25073294f0@dwillia2-xfh.jf.intel.com.notmuch> Content-Language: en-US From: Raghavendra K T In-Reply-To: Content-Type: text/plain; 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It is traversing >> past the top-level entry of the the iomem_resource topology to >> discover that a >> Soft Reserved range is described by CXL. Then the expectation is that >> the CXL subsystem parses the topology and registers a dax device. >> >> I missed that detail in my repro because I was not testing the HMEM >> handoff. >> >> Now, the dmesg shows that the CXL subsystem gives up early on the >> CXL devices as they do not appear to be meeting the expecations of a "CXL >> Memory Device" as described by the "PCI Header - Class Code Register >> (Offset 09h)" of the CXL spec. >> >> Specifically these messages: >> >>      [    4.449072] cxl_pci 0000:9f:00.0: registers not found: status >> mbox memdev >> >> I think this situation is increasingly showing that the pace of >> non-standard quirks being deployed is higher than CXL subsystem is able >> to keep pace. >> >> The immediate workaround to this problem that Linux discovered is to >> disable the cxl_acpi driver. Can you confirm that preventing the >> cxl_acpi driver from loading restores that missing node? > > Yes, disabling CONFIG_CXL_ACPI gets the CXL node up with the memory. > Thanks for this workaround. > Thank you Bharata for filling in. Thank you Dan, Andy, Gregory, Ying for your input. (sorry for the delay because machine was not available as pointed by Bharata). This helps to proceed with CONFIG_CXL_ACPI=n for now in my case. - Raghu