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cccf6ee090
When the HED driver is built-in, it initializes after evged because they both are at the same initcall level, so the initialization ordering depends on the Makefile order. However, this prevents RAS records coming in between the evged driver initialization and the HED driver initialization from being handled. If the number of such RAS records is above the APEI HEST error source number, the HEST resources may be exhausted, and that may affect subsequent RAS error reporting. To fix this issue, change the initcall level of HED to subsys_initcall and prevent the driver from being built as a module by changing ACPI_HED in Kconfig from "tristate" to "bool". Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Link: https://patch.msgid.link/20250212063408.927666-1-tanxiaofei@huawei.com [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ACPI Hardware Error Device (PNP0C33) Driver
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*
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* Copyright (C) 2010, Intel Corp.
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* Author: Huang Ying <ying.huang@intel.com>
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*
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* ACPI Hardware Error Device is used to report some hardware errors
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* notified via SCI, mainly the corrected errors.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <acpi/hed.h>
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static const struct acpi_device_id acpi_hed_ids[] = {
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{"PNP0C33", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, acpi_hed_ids);
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static acpi_handle hed_handle;
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static BLOCKING_NOTIFIER_HEAD(acpi_hed_notify_list);
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int register_acpi_hed_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(register_acpi_hed_notifier);
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void unregister_acpi_hed_notifier(struct notifier_block *nb)
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{
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blocking_notifier_chain_unregister(&acpi_hed_notify_list, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_hed_notifier);
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/*
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* SCI to report hardware error is forwarded to the listeners of HED,
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* it is used by HEST Generic Hardware Error Source with notify type
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* SCI.
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*/
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static void acpi_hed_notify(acpi_handle handle, u32 event, void *data)
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{
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blocking_notifier_call_chain(&acpi_hed_notify_list, 0, NULL);
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}
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static int acpi_hed_add(struct acpi_device *device)
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{
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int err;
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/* Only one hardware error device */
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if (hed_handle)
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return -EINVAL;
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hed_handle = device->handle;
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err = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify, device);
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if (err)
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hed_handle = NULL;
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return err;
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}
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static void acpi_hed_remove(struct acpi_device *device)
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{
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acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
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acpi_hed_notify);
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hed_handle = NULL;
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}
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static struct acpi_driver acpi_hed_driver = {
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.name = "hardware_error_device",
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.class = "hardware_error",
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.ids = acpi_hed_ids,
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.ops = {
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.add = acpi_hed_add,
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.remove = acpi_hed_remove,
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},
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};
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static int __init acpi_hed_driver_init(void)
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{
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return acpi_bus_register_driver(&acpi_hed_driver);
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}
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subsys_initcall(acpi_hed_driver_init);
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MODULE_AUTHOR("Huang Ying");
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MODULE_DESCRIPTION("ACPI Hardware Error Device Driver");
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MODULE_LICENSE("GPL");
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