hulk inclusion category: feature bugzilla: https://atomgit.com/openeuler/kernel/issues/8489 -------------------------------- Add sysctl interface to control GHES triggered soft-offline page handling: - BIT0: Enable/disable driver notification (for BMC reporting, default 0) - BIT1: Enable/disable soft-offline for base pages (default 1) - BIT2: Enable/disable soft-offline for HugeTLB pages (default 0) Only BIT0 changes trigger notifier chain for driver notification. BIT1-2 control whether to perform soft-offline without notifications. Default policy (0x2) performs soft-offline on base pages only. Signed-off-by: Qi Xi <xiqi2@huawei.com> --- drivers/acpi/apei/Makefile | 1 + drivers/acpi/apei/apei-internal.h | 8 +++ drivers/acpi/apei/ghes-policy.c | 102 ++++++++++++++++++++++++++++++ drivers/acpi/apei/ghes.c | 3 + include/linux/acpi.h | 13 ++++ 5 files changed, 127 insertions(+) create mode 100644 drivers/acpi/apei/ghes-policy.c diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile index 4dfac2128737..a2f54a554abd 100644 --- a/drivers/acpi/apei/Makefile +++ b/drivers/acpi/apei/Makefile @@ -3,5 +3,6 @@ obj-$(CONFIG_ACPI_APEI) += apei.o obj-$(CONFIG_ACPI_APEI_GHES) += ghes.o obj-$(CONFIG_ACPI_APEI_EINJ) += einj.o obj-$(CONFIG_ACPI_APEI_ERST_DEBUG) += erst-dbg.o +obj-$(CONFIG_ACPI_APEI_MEMORY_FAILURE) += ghes-policy.o apei-y := apei-base.o hest.o erst.o bert.o diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h index 67c2c3b959e1..472f023bb227 100644 --- a/drivers/acpi/apei/apei-internal.h +++ b/drivers/acpi/apei/apei-internal.h @@ -130,4 +130,12 @@ static inline u32 cper_estatus_len(struct acpi_hest_generic_status *estatus) } int apei_osc_setup(void); +#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE +bool apei_page_should_offline(unsigned long pfn); +#else +static inline bool apei_page_should_offline(unsigned long pfn) +{ + return true; +} +#endif #endif diff --git a/drivers/acpi/apei/ghes-policy.c b/drivers/acpi/apei/ghes-policy.c new file mode 100644 index 000000000000..87c611f2cbaa --- /dev/null +++ b/drivers/acpi/apei/ghes-policy.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2026 HUAWEI, Inc. + * https://www.huawei.com/ + */ + +#include <linux/mm.h> +#include <linux/sysctl.h> +#include <linux/notifier.h> + +#define APEI_PAGE_OFFLINE_NOTIFY BIT(0) +#define APEI_PAGE_OFFLINE_ALLOW_BASE_PAGE BIT(1) +#define APEI_PAGE_OFFLINE_ALLOW_HUGETLB BIT(2) + +const int apei_page_offline_policy_max = 7; +int sysctl_apei_page_offline_policy __read_mostly = + APEI_PAGE_OFFLINE_ALLOW_BASE_PAGE; +EXPORT_SYMBOL(sysctl_apei_page_offline_policy); + +static ATOMIC_NOTIFIER_HEAD(apei_page_offline_notifier_chain); + +int register_apei_page_offline_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_register( + &apei_page_offline_notifier_chain, nb); +} +EXPORT_SYMBOL(register_apei_page_offline_notifier); + +int unregister_apei_page_offline_notifier(struct notifier_block *nb) +{ + return atomic_notifier_chain_unregister( + &apei_page_offline_notifier_chain, nb); +} +EXPORT_SYMBOL(unregister_apei_page_offline_notifier); + +static int apei_page_offline_policy_handler(struct ctl_table *table, + int write, void __user *buffer, + size_t *lenp, loff_t *ppos) +{ + int old_val, new_val; + int ret; + + old_val = sysctl_apei_page_offline_policy; + ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); + + if (write && ret == 0) { + new_val = sysctl_apei_page_offline_policy; + pr_debug("APEI policy: 0x%x -> 0x%x\n", old_val, new_val); + + if ((old_val ^ new_val) & APEI_PAGE_OFFLINE_NOTIFY) + atomic_notifier_call_chain( + &apei_page_offline_notifier_chain, 0, + &new_val); + } + + return ret; +} + +bool apei_page_should_offline(unsigned long pfn) +{ + struct page *page; + + page = pfn_to_online_page(pfn); + if (!page) + return false; + + if (!(sysctl_apei_page_offline_policy & APEI_PAGE_OFFLINE_ALLOW_BASE_PAGE)) { + if (!PageHuge(page)) { + pr_info_once("disabled for normal pages by /proc/sys/vm/apei_page_offline_policy\n"); + return false; + } + } + + if (!(sysctl_apei_page_offline_policy & APEI_PAGE_OFFLINE_ALLOW_HUGETLB)) { + if (PageHuge(page)) { + pr_info_once("disabled for HugeTLB pages by /proc/sys/vm/apei_page_offline_policy\n"); + return false; + } + } + + return true; +} + +static struct ctl_table apei_table[] = { + { + .procname = "apei_page_offline_policy", + .data = &sysctl_apei_page_offline_policy, + .maxlen = sizeof(sysctl_apei_page_offline_policy), + .mode = 0644, + .proc_handler = apei_page_offline_policy_handler, + .extra1 = SYSCTL_ZERO, + .extra2 = (void *)&apei_page_offline_policy_max, + }, + {} +}; + +static int __init apei_policy_sysctl_init(void) +{ + register_sysctl_init("vm", apei_table); + return 0; +} +late_initcall(apei_policy_sysctl_init); diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index ddcab0eddf4f..8a3fc78ec4ea 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -520,6 +520,9 @@ static bool ghes_do_memory_failure(u64 physical_addr, int flags) return true; } + if (flags == MF_SOFT_OFFLINE && !apei_page_should_offline(pfn)) + return false; + memory_failure_queue(pfn, flags); return true; } diff --git a/include/linux/acpi.h b/include/linux/acpi.h index a116ff262ef5..e59a74273e6e 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1582,5 +1582,18 @@ extern acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src); static inline void acpi_device_notify(struct device *dev) { } static inline void acpi_device_notify_remove(struct device *dev) { } #endif +#ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE +int register_apei_page_offline_notifier(struct notifier_block *nb); +int unregister_apei_page_offline_notifier(struct notifier_block *nb); +#else +static inline int register_apei_page_offline_notifier(struct notifier_block *nb) +{ + return 0; +} +static inline int unregister_apei_page_offline_notifier(struct notifier_block *nb) +{ + return 0; +} +#endif #endif /*_LINUX_ACPI_H*/ -- 2.33.0