1 // SPDX-License-Identifier: GPL-2.0-only
3 * APEI Generic Hardware Error Source support
5 * Generic Hardware Error Source provides a way to report platform
6 * hardware errors (such as that from chipset). It works in so called
7 * "Firmware First" mode, that is, hardware errors are reported to
8 * firmware firstly, then reported to Linux by firmware. This way,
9 * some non-standard hardware error registers or non-standard hardware
10 * link can be checked by firmware to produce more hardware error
11 * information for Linux.
13 * For more information about Generic Hardware Error Source, please
14 * refer to ACPI Specification version 4.0, section 17.3.2.6
16 * Copyright 2010,2011 Intel Corp.
17 * Author: Huang Ying <ying.huang@intel.com>
20 #include <linux/arm_sdei.h>
21 #include <linux/kernel.h>
22 #include <linux/moduleparam.h>
23 #include <linux/init.h>
24 #include <linux/acpi.h>
26 #include <linux/interrupt.h>
27 #include <linux/timer.h>
28 #include <linux/cper.h>
29 #include <linux/platform_device.h>
30 #include <linux/mutex.h>
31 #include <linux/ratelimit.h>
32 #include <linux/vmalloc.h>
33 #include <linux/irq_work.h>
34 #include <linux/llist.h>
35 #include <linux/genalloc.h>
36 #include <linux/pci.h>
37 #include <linux/pfn.h>
38 #include <linux/aer.h>
39 #include <linux/nmi.h>
40 #include <linux/sched/clock.h>
41 #include <linux/uuid.h>
42 #include <linux/ras.h>
43 #include <linux/task_work.h>
45 #include <acpi/actbl1.h>
46 #include <acpi/ghes.h>
47 #include <acpi/apei.h>
48 #include <asm/fixmap.h>
49 #include <asm/tlbflush.h>
50 #include <ras/ras_event.h>
52 #include "apei-internal.h"
54 #define GHES_PFX "GHES: "
56 #define GHES_ESTATUS_MAX_SIZE 65536
57 #define GHES_ESOURCE_PREALLOC_MAX_SIZE 65536
59 #define GHES_ESTATUS_POOL_MIN_ALLOC_ORDER 3
61 /* This is just an estimation for memory pool allocation */
62 #define GHES_ESTATUS_CACHE_AVG_SIZE 512
64 #define GHES_ESTATUS_CACHES_SIZE 4
66 #define GHES_ESTATUS_IN_CACHE_MAX_NSEC 10000000000ULL
67 /* Prevent too many caches are allocated because of RCU */
68 #define GHES_ESTATUS_CACHE_ALLOCED_MAX (GHES_ESTATUS_CACHES_SIZE * 3 / 2)
70 #define GHES_ESTATUS_CACHE_LEN(estatus_len) \
71 (sizeof(struct ghes_estatus_cache) + (estatus_len))
72 #define GHES_ESTATUS_FROM_CACHE(estatus_cache) \
73 ((struct acpi_hest_generic_status *) \
74 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
76 #define GHES_ESTATUS_NODE_LEN(estatus_len) \
77 (sizeof(struct ghes_estatus_node) + (estatus_len))
78 #define GHES_ESTATUS_FROM_NODE(estatus_node) \
79 ((struct acpi_hest_generic_status *) \
80 ((struct ghes_estatus_node *)(estatus_node) + 1))
82 #define GHES_VENDOR_ENTRY_LEN(gdata_len) \
83 (sizeof(struct ghes_vendor_record_entry) + (gdata_len))
84 #define GHES_GDATA_FROM_VENDOR_ENTRY(vendor_entry) \
85 ((struct acpi_hest_generic_data *) \
86 ((struct ghes_vendor_record_entry *)(vendor_entry) + 1))
89 * NMI-like notifications vary by architecture, before the compiler can prune
90 * unused static functions it needs a value for these enums.
92 #ifndef CONFIG_ARM_SDE_INTERFACE
93 #define FIX_APEI_GHES_SDEI_NORMAL __end_of_fixed_addresses
94 #define FIX_APEI_GHES_SDEI_CRITICAL __end_of_fixed_addresses
97 static ATOMIC_NOTIFIER_HEAD(ghes_report_chain);
99 static inline bool is_hest_type_generic_v2(struct ghes *ghes)
101 return ghes->generic->header.type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
105 * A platform may describe one error source for the handling of synchronous
106 * errors (e.g. MCE or SEA), or for handling asynchronous errors (e.g. SCI
107 * or External Interrupt). On x86, the HEST notifications are always
108 * asynchronous, so only SEA on ARM is delivered as a synchronous
111 static inline bool is_hest_sync_notify(struct ghes *ghes)
113 u8 notify_type = ghes->generic->notify.type;
115 return notify_type == ACPI_HEST_NOTIFY_SEA;
119 * This driver isn't really modular, however for the time being,
120 * continuing to use module_param is the easiest way to remain
121 * compatible with existing boot arg use cases.
124 module_param_named(disable, ghes_disable, bool, 0);
127 * "ghes.edac_force_enable" forcibly enables ghes_edac and skips the platform
130 static bool ghes_edac_force_enable;
131 module_param_named(edac_force_enable, ghes_edac_force_enable, bool, 0);
134 * All error sources notified with HED (Hardware Error Device) share a
135 * single notifier callback, so they need to be linked and checked one
136 * by one. This holds true for NMI too.
138 * RCU is used for these lists, so ghes_list_mutex is only used for
139 * list changing, not for traversing.
141 static LIST_HEAD(ghes_hed);
142 static DEFINE_MUTEX(ghes_list_mutex);
145 * A list of GHES devices which are given to the corresponding EDAC driver
146 * ghes_edac for further use.
148 static LIST_HEAD(ghes_devs);
149 static DEFINE_MUTEX(ghes_devs_mutex);
152 * Because the memory area used to transfer hardware error information
153 * from BIOS to Linux can be determined only in NMI, IRQ or timer
154 * handler, but general ioremap can not be used in atomic context, so
155 * the fixmap is used instead.
157 * This spinlock is used to prevent the fixmap entry from being used
160 static DEFINE_SPINLOCK(ghes_notify_lock_irq);
162 struct ghes_vendor_record_entry {
163 struct work_struct work;
165 char vendor_record[];
168 static struct gen_pool *ghes_estatus_pool;
170 static struct ghes_estatus_cache __rcu *ghes_estatus_caches[GHES_ESTATUS_CACHES_SIZE];
171 static atomic_t ghes_estatus_cache_alloced;
173 static int ghes_panic_timeout __read_mostly = 30;
175 static void __iomem *ghes_map(u64 pfn, enum fixed_addresses fixmap_idx)
180 paddr = PFN_PHYS(pfn);
181 prot = arch_apei_get_mem_attribute(paddr);
182 __set_fixmap(fixmap_idx, paddr, prot);
184 return (void __iomem *) __fix_to_virt(fixmap_idx);
187 static void ghes_unmap(void __iomem *vaddr, enum fixed_addresses fixmap_idx)
189 int _idx = virt_to_fix((unsigned long)vaddr);
191 WARN_ON_ONCE(fixmap_idx != _idx);
192 clear_fixmap(fixmap_idx);
195 int ghes_estatus_pool_init(unsigned int num_ghes)
197 unsigned long addr, len;
200 ghes_estatus_pool = gen_pool_create(GHES_ESTATUS_POOL_MIN_ALLOC_ORDER, -1);
201 if (!ghes_estatus_pool)
204 len = GHES_ESTATUS_CACHE_AVG_SIZE * GHES_ESTATUS_CACHE_ALLOCED_MAX;
205 len += (num_ghes * GHES_ESOURCE_PREALLOC_MAX_SIZE);
207 addr = (unsigned long)vmalloc(PAGE_ALIGN(len));
211 rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
221 gen_pool_destroy(ghes_estatus_pool);
227 * ghes_estatus_pool_region_free - free previously allocated memory
228 * from the ghes_estatus_pool.
229 * @addr: address of memory to free.
230 * @size: size of memory to free.
234 void ghes_estatus_pool_region_free(unsigned long addr, u32 size)
236 gen_pool_free(ghes_estatus_pool, addr, size);
238 EXPORT_SYMBOL_GPL(ghes_estatus_pool_region_free);
240 static int map_gen_v2(struct ghes *ghes)
242 return apei_map_generic_address(&ghes->generic_v2->read_ack_register);
245 static void unmap_gen_v2(struct ghes *ghes)
247 apei_unmap_generic_address(&ghes->generic_v2->read_ack_register);
250 static void ghes_ack_error(struct acpi_hest_generic_v2 *gv2)
255 rc = apei_read(&val, &gv2->read_ack_register);
259 val &= gv2->read_ack_preserve << gv2->read_ack_register.bit_offset;
260 val |= gv2->read_ack_write << gv2->read_ack_register.bit_offset;
262 apei_write(val, &gv2->read_ack_register);
265 static struct ghes *ghes_new(struct acpi_hest_generic *generic)
268 unsigned int error_block_length;
271 ghes = kzalloc(sizeof(*ghes), GFP_KERNEL);
273 return ERR_PTR(-ENOMEM);
275 ghes->generic = generic;
276 if (is_hest_type_generic_v2(ghes)) {
277 rc = map_gen_v2(ghes);
282 rc = apei_map_generic_address(&generic->error_status_address);
284 goto err_unmap_read_ack_addr;
285 error_block_length = generic->error_block_length;
286 if (error_block_length > GHES_ESTATUS_MAX_SIZE) {
287 pr_warn(FW_WARN GHES_PFX
288 "Error status block length is too long: %u for "
289 "generic hardware error source: %d.\n",
290 error_block_length, generic->header.source_id);
291 error_block_length = GHES_ESTATUS_MAX_SIZE;
293 ghes->estatus = kmalloc(error_block_length, GFP_KERNEL);
294 if (!ghes->estatus) {
296 goto err_unmap_status_addr;
301 err_unmap_status_addr:
302 apei_unmap_generic_address(&generic->error_status_address);
303 err_unmap_read_ack_addr:
304 if (is_hest_type_generic_v2(ghes))
311 static void ghes_fini(struct ghes *ghes)
313 kfree(ghes->estatus);
314 apei_unmap_generic_address(&ghes->generic->error_status_address);
315 if (is_hest_type_generic_v2(ghes))
319 static inline int ghes_severity(int severity)
322 case CPER_SEV_INFORMATIONAL:
324 case CPER_SEV_CORRECTED:
325 return GHES_SEV_CORRECTED;
326 case CPER_SEV_RECOVERABLE:
327 return GHES_SEV_RECOVERABLE;
329 return GHES_SEV_PANIC;
331 /* Unknown, go panic */
332 return GHES_SEV_PANIC;
336 static void ghes_copy_tofrom_phys(void *buffer, u64 paddr, u32 len,
338 enum fixed_addresses fixmap_idx)
345 offset = paddr - (paddr & PAGE_MASK);
346 vaddr = ghes_map(PHYS_PFN(paddr), fixmap_idx);
347 trunk = PAGE_SIZE - offset;
348 trunk = min(trunk, len);
350 memcpy_fromio(buffer, vaddr + offset, trunk);
352 memcpy_toio(vaddr + offset, buffer, trunk);
356 ghes_unmap(vaddr, fixmap_idx);
360 /* Check the top-level record header has an appropriate size. */
361 static int __ghes_check_estatus(struct ghes *ghes,
362 struct acpi_hest_generic_status *estatus)
364 u32 len = cper_estatus_len(estatus);
366 if (len < sizeof(*estatus)) {
367 pr_warn_ratelimited(FW_WARN GHES_PFX "Truncated error status block!\n");
371 if (len > ghes->generic->error_block_length) {
372 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid error status block length!\n");
376 if (cper_estatus_check_header(estatus)) {
377 pr_warn_ratelimited(FW_WARN GHES_PFX "Invalid CPER header!\n");
384 /* Read the CPER block, returning its address, and header in estatus. */
385 static int __ghes_peek_estatus(struct ghes *ghes,
386 struct acpi_hest_generic_status *estatus,
387 u64 *buf_paddr, enum fixed_addresses fixmap_idx)
389 struct acpi_hest_generic *g = ghes->generic;
392 rc = apei_read(buf_paddr, &g->error_status_address);
395 pr_warn_ratelimited(FW_WARN GHES_PFX
396 "Failed to read error status block address for hardware error source: %d.\n",
397 g->header.source_id);
403 ghes_copy_tofrom_phys(estatus, *buf_paddr, sizeof(*estatus), 1,
405 if (!estatus->block_status) {
413 static int __ghes_read_estatus(struct acpi_hest_generic_status *estatus,
414 u64 buf_paddr, enum fixed_addresses fixmap_idx,
417 ghes_copy_tofrom_phys(estatus, buf_paddr, buf_len, 1, fixmap_idx);
418 if (cper_estatus_check(estatus)) {
419 pr_warn_ratelimited(FW_WARN GHES_PFX
420 "Failed to read error status block!\n");
427 static int ghes_read_estatus(struct ghes *ghes,
428 struct acpi_hest_generic_status *estatus,
429 u64 *buf_paddr, enum fixed_addresses fixmap_idx)
433 rc = __ghes_peek_estatus(ghes, estatus, buf_paddr, fixmap_idx);
437 rc = __ghes_check_estatus(ghes, estatus);
441 return __ghes_read_estatus(estatus, *buf_paddr, fixmap_idx,
442 cper_estatus_len(estatus));
445 static void ghes_clear_estatus(struct ghes *ghes,
446 struct acpi_hest_generic_status *estatus,
447 u64 buf_paddr, enum fixed_addresses fixmap_idx)
449 estatus->block_status = 0;
454 ghes_copy_tofrom_phys(estatus, buf_paddr,
455 sizeof(estatus->block_status), 0,
459 * GHESv2 type HEST entries introduce support for error acknowledgment,
460 * so only acknowledge the error if this support is present.
462 if (is_hest_type_generic_v2(ghes))
463 ghes_ack_error(ghes->generic_v2);
467 * Called as task_work before returning to user-space.
468 * Ensure any queued work has been done before we return to the context that
469 * triggered the notification.
471 static void ghes_kick_task_work(struct callback_head *head)
473 struct acpi_hest_generic_status *estatus;
474 struct ghes_estatus_node *estatus_node;
477 estatus_node = container_of(head, struct ghes_estatus_node, task_work);
478 if (IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
479 memory_failure_queue_kick(estatus_node->task_work_cpu);
481 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
482 node_len = GHES_ESTATUS_NODE_LEN(cper_estatus_len(estatus));
483 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node, node_len);
486 static bool ghes_do_memory_failure(u64 physical_addr, int flags)
490 if (!IS_ENABLED(CONFIG_ACPI_APEI_MEMORY_FAILURE))
493 pfn = PHYS_PFN(physical_addr);
494 if (!pfn_valid(pfn) && !arch_is_platform_page(physical_addr)) {
495 pr_warn_ratelimited(FW_WARN GHES_PFX
496 "Invalid address in generic error data: %#llx\n",
501 memory_failure_queue(pfn, flags);
505 static bool ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata,
509 int sec_sev = ghes_severity(gdata->error_severity);
510 struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
512 if (!(mem_err->validation_bits & CPER_MEM_VALID_PA))
515 /* iff following two events can be handled properly by now */
516 if (sec_sev == GHES_SEV_CORRECTED &&
517 (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED))
518 flags = MF_SOFT_OFFLINE;
519 if (sev == GHES_SEV_RECOVERABLE && sec_sev == GHES_SEV_RECOVERABLE)
520 flags = sync ? MF_ACTION_REQUIRED : 0;
523 return ghes_do_memory_failure(mem_err->physical_addr, flags);
528 static bool ghes_handle_arm_hw_error(struct acpi_hest_generic_data *gdata,
531 struct cper_sec_proc_arm *err = acpi_hest_get_payload(gdata);
532 int flags = sync ? MF_ACTION_REQUIRED : 0;
537 log_arm_hw_error(err);
539 sec_sev = ghes_severity(gdata->error_severity);
540 if (sev != GHES_SEV_RECOVERABLE || sec_sev != GHES_SEV_RECOVERABLE)
543 p = (char *)(err + 1);
544 for (i = 0; i < err->err_info_num; i++) {
545 struct cper_arm_err_info *err_info = (struct cper_arm_err_info *)p;
546 bool is_cache = (err_info->type == CPER_ARM_CACHE_ERROR);
547 bool has_pa = (err_info->validation_bits & CPER_ARM_INFO_VALID_PHYSICAL_ADDR);
548 const char *error_type = "unknown error";
551 * The field (err_info->error_info & BIT(26)) is fixed to set to
552 * 1 in some old firmware of HiSilicon Kunpeng920. We assume that
553 * firmware won't mix corrected errors in an uncorrected section,
554 * and don't filter out 'corrected' error here.
556 if (is_cache && has_pa) {
557 queued = ghes_do_memory_failure(err_info->physical_fault_addr, flags);
558 p += err_info->length;
562 if (err_info->type < ARRAY_SIZE(cper_proc_error_type_strs))
563 error_type = cper_proc_error_type_strs[err_info->type];
565 pr_warn_ratelimited(FW_WARN GHES_PFX
566 "Unhandled processor error type: %s\n",
568 p += err_info->length;
575 * PCIe AER errors need to be sent to the AER driver for reporting and
576 * recovery. The GHES severities map to the following AER severities and
577 * require the following handling:
579 * GHES_SEV_CORRECTABLE -> AER_CORRECTABLE
580 * These need to be reported by the AER driver but no recovery is
582 * GHES_SEV_RECOVERABLE -> AER_NONFATAL
583 * GHES_SEV_RECOVERABLE && CPER_SEC_RESET -> AER_FATAL
584 * These both need to be reported and recovered from by the AER driver.
585 * GHES_SEV_PANIC does not make it to this handling since the kernel must
588 static void ghes_handle_aer(struct acpi_hest_generic_data *gdata)
590 #ifdef CONFIG_ACPI_APEI_PCIEAER
591 struct cper_sec_pcie *pcie_err = acpi_hest_get_payload(gdata);
593 if (pcie_err->validation_bits & CPER_PCIE_VALID_DEVICE_ID &&
594 pcie_err->validation_bits & CPER_PCIE_VALID_AER_INFO) {
599 devfn = PCI_DEVFN(pcie_err->device_id.device,
600 pcie_err->device_id.function);
601 aer_severity = cper_severity_to_aer(gdata->error_severity);
604 * If firmware reset the component to contain
605 * the error, we must reinitialize it before
606 * use, so treat it as a fatal AER error.
608 if (gdata->flags & CPER_SEC_RESET)
609 aer_severity = AER_FATAL;
611 aer_info = (void *)gen_pool_alloc(ghes_estatus_pool,
612 sizeof(struct aer_capability_regs));
615 memcpy(aer_info, pcie_err->aer_info, sizeof(struct aer_capability_regs));
617 aer_recover_queue(pcie_err->device_id.segment,
618 pcie_err->device_id.bus,
620 (struct aer_capability_regs *)
626 static BLOCKING_NOTIFIER_HEAD(vendor_record_notify_list);
628 int ghes_register_vendor_record_notifier(struct notifier_block *nb)
630 return blocking_notifier_chain_register(&vendor_record_notify_list, nb);
632 EXPORT_SYMBOL_GPL(ghes_register_vendor_record_notifier);
634 void ghes_unregister_vendor_record_notifier(struct notifier_block *nb)
636 blocking_notifier_chain_unregister(&vendor_record_notify_list, nb);
638 EXPORT_SYMBOL_GPL(ghes_unregister_vendor_record_notifier);
640 static void ghes_vendor_record_work_func(struct work_struct *work)
642 struct ghes_vendor_record_entry *entry;
643 struct acpi_hest_generic_data *gdata;
646 entry = container_of(work, struct ghes_vendor_record_entry, work);
647 gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
649 blocking_notifier_call_chain(&vendor_record_notify_list,
650 entry->error_severity, gdata);
652 len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
653 gen_pool_free(ghes_estatus_pool, (unsigned long)entry, len);
656 static void ghes_defer_non_standard_event(struct acpi_hest_generic_data *gdata,
659 struct acpi_hest_generic_data *copied_gdata;
660 struct ghes_vendor_record_entry *entry;
663 len = GHES_VENDOR_ENTRY_LEN(acpi_hest_get_record_size(gdata));
664 entry = (void *)gen_pool_alloc(ghes_estatus_pool, len);
668 copied_gdata = GHES_GDATA_FROM_VENDOR_ENTRY(entry);
669 memcpy(copied_gdata, gdata, acpi_hest_get_record_size(gdata));
670 entry->error_severity = sev;
672 INIT_WORK(&entry->work, ghes_vendor_record_work_func);
673 schedule_work(&entry->work);
676 static bool ghes_do_proc(struct ghes *ghes,
677 const struct acpi_hest_generic_status *estatus)
680 struct acpi_hest_generic_data *gdata;
682 const guid_t *fru_id = &guid_null;
685 bool sync = is_hest_sync_notify(ghes);
687 sev = ghes_severity(estatus->error_severity);
688 apei_estatus_for_each_section(estatus, gdata) {
689 sec_type = (guid_t *)gdata->section_type;
690 sec_sev = ghes_severity(gdata->error_severity);
691 if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
692 fru_id = (guid_t *)gdata->fru_id;
694 if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
695 fru_text = gdata->fru_text;
697 if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
698 struct cper_sec_mem_err *mem_err = acpi_hest_get_payload(gdata);
700 atomic_notifier_call_chain(&ghes_report_chain, sev, mem_err);
702 arch_apei_report_mem_error(sev, mem_err);
703 queued = ghes_handle_memory_failure(gdata, sev, sync);
705 else if (guid_equal(sec_type, &CPER_SEC_PCIE)) {
706 ghes_handle_aer(gdata);
708 else if (guid_equal(sec_type, &CPER_SEC_PROC_ARM)) {
709 queued = ghes_handle_arm_hw_error(gdata, sev, sync);
711 void *err = acpi_hest_get_payload(gdata);
713 ghes_defer_non_standard_event(gdata, sev);
714 log_non_standard_event(sec_type, fru_id, fru_text,
716 gdata->error_data_length);
723 static void __ghes_print_estatus(const char *pfx,
724 const struct acpi_hest_generic *generic,
725 const struct acpi_hest_generic_status *estatus)
727 static atomic_t seqno;
728 unsigned int curr_seqno;
732 if (ghes_severity(estatus->error_severity) <=
738 curr_seqno = atomic_inc_return(&seqno);
739 snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
740 printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
741 pfx_seq, generic->header.source_id);
742 cper_estatus_print(pfx_seq, estatus);
745 static int ghes_print_estatus(const char *pfx,
746 const struct acpi_hest_generic *generic,
747 const struct acpi_hest_generic_status *estatus)
749 /* Not more than 2 messages every 5 seconds */
750 static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
751 static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
752 struct ratelimit_state *ratelimit;
754 if (ghes_severity(estatus->error_severity) <= GHES_SEV_CORRECTED)
755 ratelimit = &ratelimit_corrected;
757 ratelimit = &ratelimit_uncorrected;
758 if (__ratelimit(ratelimit)) {
759 __ghes_print_estatus(pfx, generic, estatus);
766 * GHES error status reporting throttle, to report more kinds of
767 * errors, instead of just most frequently occurred errors.
769 static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
773 unsigned long long now;
774 struct ghes_estatus_cache *cache;
775 struct acpi_hest_generic_status *cache_estatus;
777 len = cper_estatus_len(estatus);
779 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
780 cache = rcu_dereference(ghes_estatus_caches[i]);
783 if (len != cache->estatus_len)
785 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
786 if (memcmp(estatus, cache_estatus, len))
788 atomic_inc(&cache->count);
790 if (now - cache->time_in < GHES_ESTATUS_IN_CACHE_MAX_NSEC)
798 static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
799 struct acpi_hest_generic *generic,
800 struct acpi_hest_generic_status *estatus)
804 struct ghes_estatus_cache *cache;
805 struct acpi_hest_generic_status *cache_estatus;
807 alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
808 if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
809 atomic_dec(&ghes_estatus_cache_alloced);
812 len = cper_estatus_len(estatus);
813 cache_len = GHES_ESTATUS_CACHE_LEN(len);
814 cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
816 atomic_dec(&ghes_estatus_cache_alloced);
819 cache_estatus = GHES_ESTATUS_FROM_CACHE(cache);
820 memcpy(cache_estatus, estatus, len);
821 cache->estatus_len = len;
822 atomic_set(&cache->count, 0);
823 cache->generic = generic;
824 cache->time_in = sched_clock();
828 static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
830 struct ghes_estatus_cache *cache;
833 cache = container_of(head, struct ghes_estatus_cache, rcu);
834 len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
835 len = GHES_ESTATUS_CACHE_LEN(len);
836 gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
837 atomic_dec(&ghes_estatus_cache_alloced);
841 ghes_estatus_cache_add(struct acpi_hest_generic *generic,
842 struct acpi_hest_generic_status *estatus)
844 unsigned long long now, duration, period, max_period = 0;
845 struct ghes_estatus_cache *cache, *new_cache;
846 struct ghes_estatus_cache __rcu *victim;
847 int i, slot = -1, count;
849 new_cache = ghes_estatus_cache_alloc(generic, estatus);
855 for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
856 cache = rcu_dereference(ghes_estatus_caches[i]);
861 duration = now - cache->time_in;
862 if (duration >= GHES_ESTATUS_IN_CACHE_MAX_NSEC) {
866 count = atomic_read(&cache->count);
868 do_div(period, (count + 1));
869 if (period > max_period) {
878 * Use release semantics to ensure that ghes_estatus_cached()
879 * running on another CPU will see the updated cache fields if
880 * it can see the new value of the pointer.
882 victim = xchg_release(&ghes_estatus_caches[slot],
883 RCU_INITIALIZER(new_cache));
886 * At this point, victim may point to a cached item different
887 * from the one based on which we selected the slot. Instead of
888 * going to the loop again to pick another slot, let's just
889 * drop the other item anyway: this may cause a false cache
890 * miss later on, but that won't cause any problems.
893 call_rcu(&unrcu_pointer(victim)->rcu,
894 ghes_estatus_cache_rcu_free);
898 static void __ghes_panic(struct ghes *ghes,
899 struct acpi_hest_generic_status *estatus,
900 u64 buf_paddr, enum fixed_addresses fixmap_idx)
902 __ghes_print_estatus(KERN_EMERG, ghes->generic, estatus);
904 ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
906 /* reboot to log the error! */
908 panic_timeout = ghes_panic_timeout;
909 panic("Fatal hardware error!");
912 static int ghes_proc(struct ghes *ghes)
914 struct acpi_hest_generic_status *estatus = ghes->estatus;
918 rc = ghes_read_estatus(ghes, estatus, &buf_paddr, FIX_APEI_GHES_IRQ);
922 if (ghes_severity(estatus->error_severity) >= GHES_SEV_PANIC)
923 __ghes_panic(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
925 if (!ghes_estatus_cached(estatus)) {
926 if (ghes_print_estatus(NULL, ghes->generic, estatus))
927 ghes_estatus_cache_add(ghes->generic, estatus);
929 ghes_do_proc(ghes, estatus);
932 ghes_clear_estatus(ghes, estatus, buf_paddr, FIX_APEI_GHES_IRQ);
937 static void ghes_add_timer(struct ghes *ghes)
939 struct acpi_hest_generic *g = ghes->generic;
940 unsigned long expire;
942 if (!g->notify.poll_interval) {
943 pr_warn(FW_WARN GHES_PFX "Poll interval is 0 for generic hardware error source: %d, disabled.\n",
944 g->header.source_id);
947 expire = jiffies + msecs_to_jiffies(g->notify.poll_interval);
948 ghes->timer.expires = round_jiffies_relative(expire);
949 add_timer(&ghes->timer);
952 static void ghes_poll_func(struct timer_list *t)
954 struct ghes *ghes = from_timer(ghes, t, timer);
957 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
959 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
960 if (!(ghes->flags & GHES_EXITING))
961 ghes_add_timer(ghes);
964 static irqreturn_t ghes_irq_func(int irq, void *data)
966 struct ghes *ghes = data;
970 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
971 rc = ghes_proc(ghes);
972 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
979 static int ghes_notify_hed(struct notifier_block *this, unsigned long event,
984 int ret = NOTIFY_DONE;
986 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
988 list_for_each_entry_rcu(ghes, &ghes_hed, list) {
989 if (!ghes_proc(ghes))
993 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
998 static struct notifier_block ghes_notifier_hed = {
999 .notifier_call = ghes_notify_hed,
1003 * Handlers for CPER records may not be NMI safe. For example,
1004 * memory_failure_queue() takes spinlocks and calls schedule_work_on().
1005 * In any NMI-like handler, memory from ghes_estatus_pool is used to save
1006 * estatus, and added to the ghes_estatus_llist. irq_work_queue() causes
1007 * ghes_proc_in_irq() to run in IRQ context where each estatus in
1008 * ghes_estatus_llist is processed.
1010 * Memory from the ghes_estatus_pool is also used with the ghes_estatus_cache
1011 * to suppress frequent messages.
1013 static struct llist_head ghes_estatus_llist;
1014 static struct irq_work ghes_proc_irq_work;
1016 static void ghes_proc_in_irq(struct irq_work *irq_work)
1018 struct llist_node *llnode, *next;
1019 struct ghes_estatus_node *estatus_node;
1020 struct acpi_hest_generic *generic;
1021 struct acpi_hest_generic_status *estatus;
1022 bool task_work_pending;
1026 llnode = llist_del_all(&ghes_estatus_llist);
1028 * Because the time order of estatus in list is reversed,
1029 * revert it back to proper order.
1031 llnode = llist_reverse_order(llnode);
1033 next = llnode->next;
1034 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
1036 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1037 len = cper_estatus_len(estatus);
1038 node_len = GHES_ESTATUS_NODE_LEN(len);
1039 task_work_pending = ghes_do_proc(estatus_node->ghes, estatus);
1040 if (!ghes_estatus_cached(estatus)) {
1041 generic = estatus_node->generic;
1042 if (ghes_print_estatus(NULL, generic, estatus))
1043 ghes_estatus_cache_add(generic, estatus);
1046 if (task_work_pending && current->mm) {
1047 estatus_node->task_work.func = ghes_kick_task_work;
1048 estatus_node->task_work_cpu = smp_processor_id();
1049 ret = task_work_add(current, &estatus_node->task_work,
1052 estatus_node->task_work.func = NULL;
1055 if (!estatus_node->task_work.func)
1056 gen_pool_free(ghes_estatus_pool,
1057 (unsigned long)estatus_node, node_len);
1063 static void ghes_print_queued_estatus(void)
1065 struct llist_node *llnode;
1066 struct ghes_estatus_node *estatus_node;
1067 struct acpi_hest_generic *generic;
1068 struct acpi_hest_generic_status *estatus;
1070 llnode = llist_del_all(&ghes_estatus_llist);
1072 * Because the time order of estatus in list is reversed,
1073 * revert it back to proper order.
1075 llnode = llist_reverse_order(llnode);
1077 estatus_node = llist_entry(llnode, struct ghes_estatus_node,
1079 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1080 generic = estatus_node->generic;
1081 ghes_print_estatus(NULL, generic, estatus);
1082 llnode = llnode->next;
1086 static int ghes_in_nmi_queue_one_entry(struct ghes *ghes,
1087 enum fixed_addresses fixmap_idx)
1089 struct acpi_hest_generic_status *estatus, tmp_header;
1090 struct ghes_estatus_node *estatus_node;
1095 if (!IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG))
1098 rc = __ghes_peek_estatus(ghes, &tmp_header, &buf_paddr, fixmap_idx);
1100 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1104 rc = __ghes_check_estatus(ghes, &tmp_header);
1106 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1110 len = cper_estatus_len(&tmp_header);
1111 node_len = GHES_ESTATUS_NODE_LEN(len);
1112 estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool, node_len);
1116 estatus_node->ghes = ghes;
1117 estatus_node->generic = ghes->generic;
1118 estatus_node->task_work.func = NULL;
1119 estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
1121 if (__ghes_read_estatus(estatus, buf_paddr, fixmap_idx, len)) {
1122 ghes_clear_estatus(ghes, estatus, buf_paddr, fixmap_idx);
1127 sev = ghes_severity(estatus->error_severity);
1128 if (sev >= GHES_SEV_PANIC) {
1129 ghes_print_queued_estatus();
1130 __ghes_panic(ghes, estatus, buf_paddr, fixmap_idx);
1133 ghes_clear_estatus(ghes, &tmp_header, buf_paddr, fixmap_idx);
1135 /* This error has been reported before, don't process it again. */
1136 if (ghes_estatus_cached(estatus))
1139 llist_add(&estatus_node->llnode, &ghes_estatus_llist);
1144 gen_pool_free(ghes_estatus_pool, (unsigned long)estatus_node,
1150 static int ghes_in_nmi_spool_from_list(struct list_head *rcu_list,
1151 enum fixed_addresses fixmap_idx)
1157 list_for_each_entry_rcu(ghes, rcu_list, list) {
1158 if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx))
1163 if (IS_ENABLED(CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG) && !ret)
1164 irq_work_queue(&ghes_proc_irq_work);
1169 #ifdef CONFIG_ACPI_APEI_SEA
1170 static LIST_HEAD(ghes_sea);
1173 * Return 0 only if one of the SEA error sources successfully reported an error
1174 * record sent from the firmware.
1176 int ghes_notify_sea(void)
1178 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sea);
1181 raw_spin_lock(&ghes_notify_lock_sea);
1182 rv = ghes_in_nmi_spool_from_list(&ghes_sea, FIX_APEI_GHES_SEA);
1183 raw_spin_unlock(&ghes_notify_lock_sea);
1188 static void ghes_sea_add(struct ghes *ghes)
1190 mutex_lock(&ghes_list_mutex);
1191 list_add_rcu(&ghes->list, &ghes_sea);
1192 mutex_unlock(&ghes_list_mutex);
1195 static void ghes_sea_remove(struct ghes *ghes)
1197 mutex_lock(&ghes_list_mutex);
1198 list_del_rcu(&ghes->list);
1199 mutex_unlock(&ghes_list_mutex);
1202 #else /* CONFIG_ACPI_APEI_SEA */
1203 static inline void ghes_sea_add(struct ghes *ghes) { }
1204 static inline void ghes_sea_remove(struct ghes *ghes) { }
1205 #endif /* CONFIG_ACPI_APEI_SEA */
1207 #ifdef CONFIG_HAVE_ACPI_APEI_NMI
1209 * NMI may be triggered on any CPU, so ghes_in_nmi is used for
1210 * having only one concurrent reader.
1212 static atomic_t ghes_in_nmi = ATOMIC_INIT(0);
1214 static LIST_HEAD(ghes_nmi);
1216 static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
1218 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_nmi);
1221 if (!atomic_add_unless(&ghes_in_nmi, 1, 1))
1224 raw_spin_lock(&ghes_notify_lock_nmi);
1225 if (!ghes_in_nmi_spool_from_list(&ghes_nmi, FIX_APEI_GHES_NMI))
1227 raw_spin_unlock(&ghes_notify_lock_nmi);
1229 atomic_dec(&ghes_in_nmi);
1233 static void ghes_nmi_add(struct ghes *ghes)
1235 mutex_lock(&ghes_list_mutex);
1236 if (list_empty(&ghes_nmi))
1237 register_nmi_handler(NMI_LOCAL, ghes_notify_nmi, 0, "ghes");
1238 list_add_rcu(&ghes->list, &ghes_nmi);
1239 mutex_unlock(&ghes_list_mutex);
1242 static void ghes_nmi_remove(struct ghes *ghes)
1244 mutex_lock(&ghes_list_mutex);
1245 list_del_rcu(&ghes->list);
1246 if (list_empty(&ghes_nmi))
1247 unregister_nmi_handler(NMI_LOCAL, "ghes");
1248 mutex_unlock(&ghes_list_mutex);
1250 * To synchronize with NMI handler, ghes can only be
1251 * freed after NMI handler finishes.
1255 #else /* CONFIG_HAVE_ACPI_APEI_NMI */
1256 static inline void ghes_nmi_add(struct ghes *ghes) { }
1257 static inline void ghes_nmi_remove(struct ghes *ghes) { }
1258 #endif /* CONFIG_HAVE_ACPI_APEI_NMI */
1260 static void ghes_nmi_init_cxt(void)
1262 init_irq_work(&ghes_proc_irq_work, ghes_proc_in_irq);
1265 static int __ghes_sdei_callback(struct ghes *ghes,
1266 enum fixed_addresses fixmap_idx)
1268 if (!ghes_in_nmi_queue_one_entry(ghes, fixmap_idx)) {
1269 irq_work_queue(&ghes_proc_irq_work);
1277 static int ghes_sdei_normal_callback(u32 event_num, struct pt_regs *regs,
1280 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_normal);
1281 struct ghes *ghes = arg;
1284 raw_spin_lock(&ghes_notify_lock_sdei_normal);
1285 err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_NORMAL);
1286 raw_spin_unlock(&ghes_notify_lock_sdei_normal);
1291 static int ghes_sdei_critical_callback(u32 event_num, struct pt_regs *regs,
1294 static DEFINE_RAW_SPINLOCK(ghes_notify_lock_sdei_critical);
1295 struct ghes *ghes = arg;
1298 raw_spin_lock(&ghes_notify_lock_sdei_critical);
1299 err = __ghes_sdei_callback(ghes, FIX_APEI_GHES_SDEI_CRITICAL);
1300 raw_spin_unlock(&ghes_notify_lock_sdei_critical);
1305 static int apei_sdei_register_ghes(struct ghes *ghes)
1307 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1310 return sdei_register_ghes(ghes, ghes_sdei_normal_callback,
1311 ghes_sdei_critical_callback);
1314 static int apei_sdei_unregister_ghes(struct ghes *ghes)
1316 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE))
1319 return sdei_unregister_ghes(ghes);
1322 static int ghes_probe(struct platform_device *ghes_dev)
1324 struct acpi_hest_generic *generic;
1325 struct ghes *ghes = NULL;
1326 unsigned long flags;
1330 generic = *(struct acpi_hest_generic **)ghes_dev->dev.platform_data;
1331 if (!generic->enabled)
1334 switch (generic->notify.type) {
1335 case ACPI_HEST_NOTIFY_POLLED:
1336 case ACPI_HEST_NOTIFY_EXTERNAL:
1337 case ACPI_HEST_NOTIFY_SCI:
1338 case ACPI_HEST_NOTIFY_GSIV:
1339 case ACPI_HEST_NOTIFY_GPIO:
1342 case ACPI_HEST_NOTIFY_SEA:
1343 if (!IS_ENABLED(CONFIG_ACPI_APEI_SEA)) {
1344 pr_warn(GHES_PFX "Generic hardware error source: %d notified via SEA is not supported\n",
1345 generic->header.source_id);
1350 case ACPI_HEST_NOTIFY_NMI:
1351 if (!IS_ENABLED(CONFIG_HAVE_ACPI_APEI_NMI)) {
1352 pr_warn(GHES_PFX "Generic hardware error source: %d notified via NMI interrupt is not supported!\n",
1353 generic->header.source_id);
1357 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1358 if (!IS_ENABLED(CONFIG_ARM_SDE_INTERFACE)) {
1359 pr_warn(GHES_PFX "Generic hardware error source: %d notified via SDE Interface is not supported!\n",
1360 generic->header.source_id);
1364 case ACPI_HEST_NOTIFY_LOCAL:
1365 pr_warn(GHES_PFX "Generic hardware error source: %d notified via local interrupt is not supported!\n",
1366 generic->header.source_id);
1369 pr_warn(FW_WARN GHES_PFX "Unknown notification type: %u for generic hardware error source: %d\n",
1370 generic->notify.type, generic->header.source_id);
1375 if (generic->error_block_length <
1376 sizeof(struct acpi_hest_generic_status)) {
1377 pr_warn(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
1378 generic->error_block_length, generic->header.source_id);
1381 ghes = ghes_new(generic);
1388 switch (generic->notify.type) {
1389 case ACPI_HEST_NOTIFY_POLLED:
1390 timer_setup(&ghes->timer, ghes_poll_func, 0);
1391 ghes_add_timer(ghes);
1393 case ACPI_HEST_NOTIFY_EXTERNAL:
1394 /* External interrupt vector is GSI */
1395 rc = acpi_gsi_to_irq(generic->notify.vector, &ghes->irq);
1397 pr_err(GHES_PFX "Failed to map GSI to IRQ for generic hardware error source: %d\n",
1398 generic->header.source_id);
1401 rc = request_irq(ghes->irq, ghes_irq_func, IRQF_SHARED,
1404 pr_err(GHES_PFX "Failed to register IRQ for generic hardware error source: %d\n",
1405 generic->header.source_id);
1410 case ACPI_HEST_NOTIFY_SCI:
1411 case ACPI_HEST_NOTIFY_GSIV:
1412 case ACPI_HEST_NOTIFY_GPIO:
1413 mutex_lock(&ghes_list_mutex);
1414 if (list_empty(&ghes_hed))
1415 register_acpi_hed_notifier(&ghes_notifier_hed);
1416 list_add_rcu(&ghes->list, &ghes_hed);
1417 mutex_unlock(&ghes_list_mutex);
1420 case ACPI_HEST_NOTIFY_SEA:
1423 case ACPI_HEST_NOTIFY_NMI:
1426 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1427 rc = apei_sdei_register_ghes(ghes);
1435 platform_set_drvdata(ghes_dev, ghes);
1437 ghes->dev = &ghes_dev->dev;
1439 mutex_lock(&ghes_devs_mutex);
1440 list_add_tail(&ghes->elist, &ghes_devs);
1441 mutex_unlock(&ghes_devs_mutex);
1443 /* Handle any pending errors right away */
1444 spin_lock_irqsave(&ghes_notify_lock_irq, flags);
1446 spin_unlock_irqrestore(&ghes_notify_lock_irq, flags);
1458 static int ghes_remove(struct platform_device *ghes_dev)
1462 struct acpi_hest_generic *generic;
1464 ghes = platform_get_drvdata(ghes_dev);
1465 generic = ghes->generic;
1467 ghes->flags |= GHES_EXITING;
1468 switch (generic->notify.type) {
1469 case ACPI_HEST_NOTIFY_POLLED:
1470 timer_shutdown_sync(&ghes->timer);
1472 case ACPI_HEST_NOTIFY_EXTERNAL:
1473 free_irq(ghes->irq, ghes);
1476 case ACPI_HEST_NOTIFY_SCI:
1477 case ACPI_HEST_NOTIFY_GSIV:
1478 case ACPI_HEST_NOTIFY_GPIO:
1479 mutex_lock(&ghes_list_mutex);
1480 list_del_rcu(&ghes->list);
1481 if (list_empty(&ghes_hed))
1482 unregister_acpi_hed_notifier(&ghes_notifier_hed);
1483 mutex_unlock(&ghes_list_mutex);
1487 case ACPI_HEST_NOTIFY_SEA:
1488 ghes_sea_remove(ghes);
1490 case ACPI_HEST_NOTIFY_NMI:
1491 ghes_nmi_remove(ghes);
1493 case ACPI_HEST_NOTIFY_SOFTWARE_DELEGATED:
1494 rc = apei_sdei_unregister_ghes(ghes);
1505 mutex_lock(&ghes_devs_mutex);
1506 list_del(&ghes->elist);
1507 mutex_unlock(&ghes_devs_mutex);
1514 static struct platform_driver ghes_platform_driver = {
1518 .probe = ghes_probe,
1519 .remove = ghes_remove,
1522 void __init acpi_ghes_init(void)
1531 switch (hest_disable) {
1532 case HEST_NOT_FOUND:
1535 pr_info(GHES_PFX "HEST is not enabled!\n");
1542 pr_info(GHES_PFX "GHES is not enabled!\n");
1546 ghes_nmi_init_cxt();
1548 rc = platform_driver_register(&ghes_platform_driver);
1552 rc = apei_osc_setup();
1553 if (rc == 0 && osc_sb_apei_support_acked)
1554 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit and WHEA _OSC.\n");
1555 else if (rc == 0 && !osc_sb_apei_support_acked)
1556 pr_info(GHES_PFX "APEI firmware first mode is enabled by WHEA _OSC.\n");
1557 else if (rc && osc_sb_apei_support_acked)
1558 pr_info(GHES_PFX "APEI firmware first mode is enabled by APEI bit.\n");
1560 pr_info(GHES_PFX "Failed to enable APEI firmware first mode.\n");
1564 * Known x86 systems that prefer GHES error reporting:
1566 static struct acpi_platform_list plat_list[] = {
1567 {"HPE ", "Server ", 0, ACPI_SIG_FADT, all_versions},
1571 struct list_head *ghes_get_devices(void)
1575 if (IS_ENABLED(CONFIG_X86)) {
1576 idx = acpi_match_platform_list(plat_list);
1578 if (!ghes_edac_force_enable)
1581 pr_warn_once("Force-loading ghes_edac on an unsupported platform. You're on your own!\n");
1583 } else if (list_empty(&ghes_devs)) {
1589 EXPORT_SYMBOL_GPL(ghes_get_devices);
1591 void ghes_register_report_chain(struct notifier_block *nb)
1593 atomic_notifier_chain_register(&ghes_report_chain, nb);
1595 EXPORT_SYMBOL_GPL(ghes_register_report_chain);
1597 void ghes_unregister_report_chain(struct notifier_block *nb)
1599 atomic_notifier_chain_unregister(&ghes_report_chain, nb);
1601 EXPORT_SYMBOL_GPL(ghes_unregister_report_chain);