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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v9 09/13] cxl/acpi: Prepare use of EFI runtime services Date: Sat, 10 Jan 2026 12:46:54 +0100 Message-ID: <20260110114705.681676-10-rrichter@amd.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260110114705.681676-1-rrichter@amd.com> References: <20260110114705.681676-1-rrichter@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000055DA:EE_|DM6PR12MB4042:EE_ X-MS-Office365-Filtering-Correlation-Id: 26abe3d7-b941-4001-4886-08de503e1dbf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?fScBP70H+BFm5+rAWTe++Ohgu6aGLvsgHCqUqn5tfsC431DEOW+Tycx4nQ2K?= =?us-ascii?Q?8asxRUgEckY7FoKH/6wb+LlKL8h/CM1BPh3WUIQkJE+BFPtgrqNUHOm79I+e?= =?us-ascii?Q?L6cfrq6Q+Qvgghg+R+51enr5ah+J4XfVpiZvme0rp2QoiUXq85NJhHwvr43k?= =?us-ascii?Q?6ZGFsq1JcE0GvrkRwdln6avNaMcAFxuS95t9lrBqoIvrWlOPmIxShqk1eG+B?= =?us-ascii?Q?JpODZqrsg9f7YD9GOrEM4BX4NcInMjwqIwP6Xo/3ImxgRh4DEQFcQRJBgwX3?= =?us-ascii?Q?0Gms+3aYUDSnYS3DUM1pCP5E6Q2wKh5OiiykzQHhPVkJwBzuvzgGPVDOgULP?= =?us-ascii?Q?nmErM/Aa13M8VyQAY4aLWB9W5tkcxRBUnoh6MATnWMDzZ6lMYFHQSJ9GX1J/?= =?us-ascii?Q?pA9JIAclTQ7ImI29TX1dsjG1ItoRwEX5avKrzlnzy0OCRFLWV7rUZQKfNQWH?= =?us-ascii?Q?xlby2pxGmWOisfN4Pb+37ipQwEqICNDS+iRBh0pQSKnTYSS7TpcdzSEK+/Pd?= =?us-ascii?Q?UXZpiUVX1QAlBhkmf/e4jz19s99M+OR2kKs9N0X7DtUwzhacro0uGlXr4kj7?= =?us-ascii?Q?dZxygwgdeiVrACqpdoZtKNa2Br8OAkHCERly/umjmxX5sFhj7dnn+9+xlmsp?= =?us-ascii?Q?ujc23XbpSbjt+Id2kZe66wre/YeNqKX5wW8XEJqVhWplhd7t3ppBFH5nDvqI?= =?us-ascii?Q?Lhif0mNLc/hM8MxkjqE8946AQQfQnvkqrVTo7zmKO4FV0xQxSPKO5qh3tZZ9?= =?us-ascii?Q?WMJqcRoHemgEeq5ojYpYbdP+vtyRkCgRnhtIflq56NiSNLPpaI2nmsEaljdE?= =?us-ascii?Q?yotJjPfK8eUA94NyCFjUMUWSyMzCCtmawNNHNmOryPXelLnFRu5l11QGCLMC?= =?us-ascii?Q?5mJP95kdPMm5rcv9EgHPNsnTiZhibHvAbOxzD7RWVDJJrSORhMD0qU1RFXbE?= =?us-ascii?Q?osBxjPzqfPa4Ibkg7dxUCkzwuLSEa1oAzAKJLa7qEBDOBjCiVwRsRRFxEdwk?= =?us-ascii?Q?0pp35QlebIE+6tZneyfhkcXAxw05KGqOMr+4WcEq0RneSzmusUQ0AO6er3ys?= =?us-ascii?Q?3LX0rWeQnTBBkRXTms0tYbcq2lrC68rC1gnx1qEw9R/NVUxPIJUi8sgsqlPg?= =?us-ascii?Q?PZ2nJaJdrDqA+H4Xwn8qeVWti72C9oFcYRe6aXn/2CMBMf3uq9KXwzQfxSBE?= =?us-ascii?Q?1k4ZfeW41MLQPP3xD6+jskhDhRoDGaJXK8OsQ1xq+JIgHa2bDvq2F/5n5i7k?= =?us-ascii?Q?7HuSSZHVcTkgD7eKNQd0q2XRpTpeopgpzENl9KD+LKGJyASG71xTjPlBFudG?= =?us-ascii?Q?++qtn0ZIhFdOjsue/aBCbeJazoF/bC3LE08GX1LcdLcKVeEUgKFys+hTyMYr?= =?us-ascii?Q?/1O9THN12T23K+aaqKaoh9t4VdnIFRdt2Ti3axMiyUWIOeh23agNdgJp85Q9?= =?us-ascii?Q?734mdxM6vKggH5mkeNDnKSqY2FDFhQKno6+0yDMacivbJBmoCBVrUW3qJhPU?= =?us-ascii?Q?KDg1jIj3FuC/3oh7t08J8u0Nu/sn+sgnPHGI3nt854Xh5YXNUis30/c/fjDJ?= =?us-ascii?Q?RGxCNxaEHeHgFIGEBmo=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2026 11:48:05.0051 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 26abe3d7-b941-4001-4886-08de503e1dbf 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000055DA.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4042 Content-Type: text/plain; charset="utf-8" In order to use EFI runtime services, esp. ACPI PRM which uses the efi_rts_wq workqueue, initialize EFI before CXL ACPI. There is a subsys_initcall order dependency if driver is builtin: subsys_initcall(cxl_acpi_init); subsys_initcall(efisubsys_init); Prevent the efi_rts_wq workqueue being used by cxl_acpi_init() before its allocation. Use subsys_initcall_sync(cxl_acpi_init) to always run efisubsys_init() first. Reported-by: Gregory Price Tested-by: Joshua Hahn Reviewed-by: Joshua Hahn Reviewed-by: Gregory Price Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Tested-by: Gregory Price Signed-off-by: Robert Richter --- drivers/cxl/acpi.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index b4bed40ef7c0..a31d0f97f916 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -1005,8 +1005,12 @@ static void __exit cxl_acpi_exit(void) cxl_bus_drain(); } =20 -/* load before dax_hmem sees 'Soft Reserved' CXL ranges */ -subsys_initcall(cxl_acpi_init); +/* + * Load before dax_hmem sees 'Soft Reserved' CXL ranges. Use + * subsys_initcall_sync() since there is an order dependency with + * subsys_initcall(efisubsys_init), which must run first. + */ +subsys_initcall_sync(cxl_acpi_init); =20 /* * Arrange for host-bridge ports to be active synchronous with --=20 2.47.3