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Wysocki" , Len Brown , Robert Richter Subject: [PATCH 15/15] cxl/acpi: Specify module load order dependency for the cxl_acpi module Date: Wed, 31 Aug 2022 10:16:03 +0200 Message-ID: <20220831081603.3415-16-rrichter@amd.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220831081603.3415-1-rrichter@amd.com> References: <20220831081603.3415-1-rrichter@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 8f78cded-e3fe-4e4e-6b37-08da8b2943d8 X-MS-TrafficTypeDiagnostic: SJ0PR12MB5406:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 3BpeFaP8B3aW8FbY8Wz7Dvggn7654vE4hnJPSTnm/rC1UtF8YLF/q79vnH9m9ICOcKIxM/DA4cvcVrcCOI00HkruG/L/+pKOCw3nyQAo2faAKpHZez39Hdxo6AnHQBG2lU6zmoi+OL8gK4e3pDdRV60784qWKWibKdscYP/gVa5wEn607GOz05e5ShIlmXNCNOv+VNR8eutwqTQ5SIGSV2BESusn+7wQm+2Z5JOMGFhEDz3vljICord1YjK6RwdqWM63xfO4ck3iQIu4UKicWmiPIbFELpxzZejE0YUupAcbFpPftRXWXOCvgz83XlqhBZqeVsfp9ZbXDC2WR8VTWfP0EJaE++tiRmZ3uLVzm3GywIKCzqNZWrHGTETS7YT1x1er7BVtrg/Jq920sFRVy/DB85mGSdkfajKEX00xRRYnh6Q6WAd1ZKHvpLZoCOBpxFohE5OSSEzwwNatb6BiyqdAEuF8PElUE+Z893g/LRvVB/9uvjgodIb0hfgQslg4EU/AA07BO4jZlgMrqkQnggBLXJ8Nj8weMmSjO0Zuh4WL2YSgg602d/c8zEw/Qg7nPiiIQkl7acdwE6iNDNSGkDKRwGtk23UZU6PM99okMbKvnDcWNV3O1FnPbewN5szcoohAP4RGw78rMpStBiagEEO3C6jLz0pz/WaTEMalRiw4r45koeZZNYusiq5ZWDGSvn2vlJfkF2SHPbhq3ZN/pYp6qJjwMVFRq9GLCyVzoGySi5oasUxvywXK56mHC4kI/iSyjBWNMKA8UQyspo5YMmcPYpEIJRn+MDndYOdt7d6Hm5fFVdGteqfEUn+Q/njy 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:(13230016)(4636009)(39860400002)(376002)(346002)(136003)(396003)(46966006)(40470700004)(36840700001)(83380400001)(316002)(426003)(336012)(16526019)(47076005)(186003)(1076003)(54906003)(110136005)(2616005)(8936002)(36756003)(2906002)(26005)(356005)(40460700003)(36860700001)(82310400005)(40480700001)(478600001)(70586007)(70206006)(8676002)(4326008)(41300700001)(5660300002)(7416002)(6666004)(82740400003)(81166007)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 Aug 2022 08:17:37.2648 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8f78cded-e3fe-4e4e-6b37-08da8b2943d8 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: CO1NAM11FT027.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB5406 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In RCD mode the CXL mem dev may be detected on the PCI bus before a CXL host is brought up. This may cause a CXL mem initialization failure as it expects the CXL host already detected. Address this by specifying the module dependencies using MODULE_SOFTDEP(). The following additional dependencies exist: * cxl_mem depends on cxl_acpi: The CXL hosts must be discovered before the CXL device is initialized. * cxl_acpi depends on cxl_port: The acpi driver adds ports to the cxl bus, the port driver should be loaded before. This might also work if modules are loaded in different order, but a) it aligns with the existing cxl_mem/cxl_port softdep and b) it always guarantees a fix module load order. Signed-off-by: Robert Richter --- drivers/cxl/acpi.c | 1 + drivers/cxl/mem.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 56b2d222afcc..63a1cb295c07 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -834,3 +834,4 @@ module_exit(cxl_host_exit); MODULE_LICENSE("GPL v2"); MODULE_IMPORT_NS(CXL); MODULE_IMPORT_NS(ACPI); +MODULE_SOFTDEP("pre: cxl_port"); diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 64ccf053d32c..ae13ec7d9894 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -128,3 +128,4 @@ MODULE_ALIAS_CXL(CXL_DEVICE_MEMORY_EXPANDER); * endpoint registration. */ MODULE_SOFTDEP("pre: cxl_port"); +MODULE_SOFTDEP("pre: cxl_acpi"); -- 2.30.2