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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v6 09/11] cxl/acpi: Prepare use of EFI runtime services Date: Fri, 14 Nov 2025 01:40:14 +0100 Message-ID: <20251114004021.1310661-10-rrichter@amd.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251114004021.1310661-1-rrichter@amd.com> References: <20251114004021.1310661-1-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: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023D2:EE_|BL3PR12MB6522:EE_ X-MS-Office365-Filtering-Correlation-Id: b10718e4-5649-4343-59c7-08de23168ff2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|7416014|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?oo2SQYQLnaSvGxJjCqn8YRe6y+2hv1Y4zge1QUDJWzbnh4ySXNLKzd6pebFv?= =?us-ascii?Q?cM7RI0+c3qEMrfIEovs7NzsSKb/dEVF7HHLdjARpixzX+Tto5Uy3j5/zTu6u?= =?us-ascii?Q?F8VgoglPWHDNV8VowrdU6A+cjtW5vGhzduV49K11ZQ/DFiBjHlMDkeH9WrRx?= =?us-ascii?Q?oCDOuj5nhHaKrscOxkG5/M8fLRhDXg0LrQ25+z4IhM9TVFnFgG0T/dIyIo8E?= =?us-ascii?Q?lTFYnooGZESwVNeexlxRq737YYl72Oo/gpuCa/OTMrgXys1wExR7pjcOrE/r?= =?us-ascii?Q?RlVpyTiltKhTdB9FyE7bxpYlZ55VtEw2ye0wUUAqVBwXSJGUrXu1uX1d7QKu?= =?us-ascii?Q?vSu6EDEDy9AXTZnl0QFFt8C2TMDyiF9APIPgNGFRUZVm8aNL4ycN6yIcB8jZ?= =?us-ascii?Q?IBDUslcmssqa0iOZnWhE0QT6UUgGsXB6Ys9BxXZiNISqTclQRHBUCX2AYI7q?= =?us-ascii?Q?ColKtw72jvpdc9Cu/ORIfFeJW+BEqHO2H9X2K9kUh5mHFEec2XXl6AVmt1A+?= =?us-ascii?Q?270Rer+y0kzE7bfvHcdGMjUebiAMkkUB0Au8Uq6Bi0qeIqNlCK1NAQjVqf/b?= =?us-ascii?Q?P2LefJ7eB+k0GSKSDa8JaHIpG3ytDBEyHMyYaCCEgLmhKbFHBf2Ph+mYdfaU?= =?us-ascii?Q?j5nh8NhQk8bKqWyTnqtHWv6e8XpGZs4oh+Ph+Asya/v+7+v35teikiUzt0ql?= =?us-ascii?Q?4h+nV8B9z7BJomMHrZ4ShP+kFeS7WOL1U6RiRsNUrbi/XZh1KbIy+Pv8Lu/z?= =?us-ascii?Q?o9rxgZYtOUtgoCCqMHF3JAVm8aT/Z4vHN1q/owYuG+IM8ZKdc3vTaUuldwA4?= =?us-ascii?Q?XS6I75nDRKXBb4DyExXLf/Vj8JfLOpA24KMpsUeyqLJChTzNLTpTPADvO86B?= =?us-ascii?Q?9oQKg8iX3cy9dzIr0hLuBukq7Y5Aw2FIxG9gh6s6CuKfEVyA9KEGji2LRbVp?= =?us-ascii?Q?OMuZUeG856bHwkmILFzko+euycZTJiO747BXZrnBUvqRD9iTJPAZf98EAxis?= =?us-ascii?Q?HpgRsTVXszrbsTynahgcwhSehxsJZTbU0mcAVMMCVkLcxbgoLgMwyrRE6MvC?= =?us-ascii?Q?x2BxvZJY7LBoEb8+WYrqUasxKZHVWlj/XsgnYIKtWLjw6ubaR/r2hENQiOtM?= =?us-ascii?Q?xBS4XADVs1RP0ayOF6Fqo4hGtCP5VnaDqjq5L+B1l6hhzKCU8GaKWWu4/jqO?= =?us-ascii?Q?urA0Oc2Jgbe1U+/HBpdpyFOPZdG8+JWGKhw43kjH7dTzjKRZR+MIANp+FQV9?= =?us-ascii?Q?V5sip4wCYqMf4R+y38x72A2MrDjBMI0707QD8SdWVhTkzd44KWwvviGqBDjv?= =?us-ascii?Q?m79jO21IbhqvRSwsGX7kRpVmfXy8C7Dgl7Pv3nPI0B4mwPlo6STHpdyPdnkj?= =?us-ascii?Q?ms9d4NOpphOtMiFcWnl+Adqr5MMSZgauhdllalgzWKFUjl7jcy/yxr4y4twI?= =?us-ascii?Q?wf3RSOb6V7CgcVbJj4SNX26AwRiyGxGUVoCsOzzwrchr7dlmCRnKJH+c0y7P?= =?us-ascii?Q?uv9+bqczJSQzyU5CuLgBiwRsfO8mFXfa+5oDZr0WonBBGI3v8IecIMQ6TnB0?= =?us-ascii?Q?oZ7UgaZcvqPG6bykj/0=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(376014)(7416014)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Nov 2025 00:41:34.3121 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b10718e4-5649-4343-59c7-08de23168ff2 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: SJ1PEPF000023D2.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6522 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 866813e1b729..604cf995d0e4 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -989,8 +989,12 @@ 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