From: Shiju Jose shiju.jose@huawei.com

mainline inclusion from mainline-v5.10-rc1 commit 9aa9cf3ee9451d08adafc03cef8e44c7ea3898e7 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4CMAR CVE: NA

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CPER records describing a firmware-first error are identified by GUID. The ghes driver currently logs, but ignores any unknown CPER records. This prevents describing errors that can't be represented by a standard entry, that would otherwise allow a driver to recover from an error. The UEFI spec calls these 'Non-standard Section Body' (N.2.3 of version 2.8).

Add a notifier chain for these non-standard/vendor-records. Callers must identify their type of records by GUID.

Record data is copied to memory from the ghes_estatus_pool to allow us to keep it until after the notifier has run.

Co-developed-by: James Morse james.morse@arm.com Link: https://lore.kernel.org/r/20200903123456.1823-2-shiju.jose@huawei.com Signed-off-by: James Morse james.morse@arm.com Signed-off-by: Shiju Jose shiju.jose@huawei.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Acked-by: "Rafael J. Wysocki" rjw@rjwysocki.net Signed-off-by: Weilong Chen chenweilong@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/acpi/apei/ghes.c | 64 ++++++++++++++++++++++++++++++++++++++++ include/acpi/ghes.h | 18 +++++++++++ 2 files changed, 82 insertions(+)

diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c index e807e8f74d1e0..08658c433b1fc 100644 --- a/drivers/acpi/apei/ghes.c +++ b/drivers/acpi/apei/ghes.c @@ -84,6 +84,12 @@ ((struct acpi_hest_generic_status *) \ ((struct ghes_estatus_node *)(estatus_node) + 1))

+#define GHES_VENDOR_ENTRY_LEN(gdata_len) \ + (sizeof(struct ghes_vendor_record_entry) + (gdata_len)) +#define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry) \ + ((struct acpi_hest_generic_data *) \ + ((struct ghes_vendor_record_entry *)(vendor_entry) + 1)) + static inline bool is_hest_type_generic_v2(struct ghes *ghes) { return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2; @@ -126,6 +132,12 @@ EXPORT_SYMBOL(ghes_ts_err_chain); static DEFINE_RAW_SPINLOCK(ghes_ioremap_lock_nmi); static DEFINE_SPINLOCK(ghes_ioremap_lock_irq);

+struct ghes_vendor_record_entry { + struct work_struct work; + int error_severity; + char vendor_record[]; +}; + static struct gen_pool *ghes_estatus_pool; static unsigned long ghes_estatus_pool_size_request;

@@ -464,6 +476,57 @@ static void ghes_handle_aer(struct acpi_hest_generic_data *gdata) #endif }

+static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list); + +int ghes_register_vendor_record_notifier(struct notifier_block *nb) +{ + return blocking_notifier_chain_register(&vendor_record_notify_list, nb); +} +EXPORT_SYMBOL_GPL(ghes_register_vendor_record_notifier); + +void ghes_unregister_vendor_record_notifier(struct notifier_block *nb) +{ + blocking_notifier_chain_unregister(&vendor_record_notify_list, nb); +} +EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier); + +static void ghes_vendor_record_work_func(struct work_struct *work) +{ + struct ghes_vendor_record_entry *entry; + struct acpi_hest_generic_data *gdata; + u32 len; + + entry = container_of(work, struct ghes_vendor_record_entry, work); + gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry); + + blocking_notifier_call_chain(&vendor_record_notify_list, + entry->error_severity, gdata); + + len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata)); + gen_pool_free(ghes_estatus_pool, (unsigned long)entry, len); +} + +static void ghes_defer_non_standard_event(struct acpi_hest_generic_data *gdata, + int sev) +{ + struct acpi_hest_generic_data *copied_gdata; + struct ghes_vendor_record_entry *entry; + u32 len; + + len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata)); + entry = (void *)gen_pool_alloc(ghes_estatus_pool, len); + if (!entry) + return; + + copied_gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry); + memcpy(copied_gdata, gdata, acpi_hest_get_record_size(gdata)); + entry->error_severity = sev; + + INIT_WORK(&entry->work, ghes_vendor_record_work_func); + schedule_work(&entry->work); +} + + void __weak ghes_arm_process_error(struct ghes *ghes, struct cper_sec_proc_arm *err, int sec_sev) { @@ -517,6 +580,7 @@ static void ghes_do_proc(struct ghes *ghes, } else { void *err = acpi_hest_get_payload(gdata);

+ ghes_defer_non_standard_event(gdata, sev); log_non_standard_event(sec_type, fru_id, fru_text, sec_sev, err, gdata->error_data_length); diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h index 9aaeaaa3d1a7f..0e96c78f9f180 100644 --- a/include/acpi/ghes.h +++ b/include/acpi/ghes.h @@ -52,6 +52,24 @@ enum { GHES_SEV_PANIC = 0x3, };

+#ifdef CONFIG_ACPI_APEI_GHES +/** + * ghes_register_vendor_record_notifier - register a notifier for vendor + * records that the kernel would otherwise ignore. + * @nb: pointer to the notifier_block structure of the event handler. + * + * return 0 : SUCCESS, non-zero : FAIL + */ +int ghes_register_vendor_record_notifier(struct notifier_block *nb); + +/** + * ghes_unregister_vendor_record_notifier - unregister the previously + * registered vendor record notifier. + * @nb: pointer to the notifier_block structure of the vendor record handler. + */ +void ghes_unregister_vendor_record_notifier(struct notifier_block *nb); +#endif + /* From drivers/edac/ghes_edac.c */

#ifdef CONFIG_EDAC_GHES