1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (C) 2017 Arm Ltd.
3 #define pr_fmt(fmt) "sdei: " fmt
6 #include <linux/acpi.h>
7 #include <linux/arm_sdei.h>
8 #include <linux/arm-smccc.h>
9 #include <linux/atomic.h>
10 #include <linux/bitops.h>
11 #include <linux/compiler.h>
12 #include <linux/cpuhotplug.h>
13 #include <linux/cpu.h>
14 #include <linux/cpu_pm.h>
15 #include <linux/errno.h>
16 #include <linux/hardirq.h>
17 #include <linux/kernel.h>
18 #include <linux/kprobes.h>
19 #include <linux/kvm_host.h>
20 #include <linux/list.h>
21 #include <linux/mutex.h>
22 #include <linux/notifier.h>
24 #include <linux/of_platform.h>
25 #include <linux/percpu.h>
26 #include <linux/platform_device.h>
28 #include <linux/ptrace.h>
29 #include <linux/preempt.h>
30 #include <linux/reboot.h>
31 #include <linux/slab.h>
32 #include <linux/smp.h>
33 #include <linux/spinlock.h>
34 #include <linux/uaccess.h>
37 * The call to use to reach the firmware.
39 static asmlinkage void (*sdei_firmware_call)(unsigned long function_id,
40 unsigned long arg0, unsigned long arg1,
41 unsigned long arg2, unsigned long arg3,
42 unsigned long arg4, struct arm_smccc_res *res);
44 /* entry point from firmware to arch asm code */
45 static unsigned long sdei_entry_point;
48 /* These three are protected by the sdei_list_lock */
49 struct list_head list;
57 /* This pointer is handed to firmware as the event argument. */
60 struct sdei_registered_event *registered;
62 /* CPU private events */
63 struct sdei_registered_event __percpu *private_registered;
67 /* Take the mutex for any API call or modification. Take the mutex first. */
68 static DEFINE_MUTEX(sdei_events_lock);
70 /* and then hold this when modifying the list */
71 static DEFINE_SPINLOCK(sdei_list_lock);
72 static LIST_HEAD(sdei_list);
74 /* Private events are registered/enabled via IPI passing one of these */
75 struct sdei_crosscall_args {
76 struct sdei_event *event;
81 #define CROSSCALL_INIT(arg, event) (arg.event = event, \
82 arg.first_error = 0, \
83 atomic_set(&arg.errors, 0))
85 static inline int sdei_do_cross_call(void *fn, struct sdei_event * event)
87 struct sdei_crosscall_args arg;
89 CROSSCALL_INIT(arg, event);
90 on_each_cpu(fn, &arg, true);
92 return arg.first_error;
96 sdei_cross_call_return(struct sdei_crosscall_args *arg, int err)
98 if (err && (atomic_inc_return(&arg->errors) == 1))
99 arg->first_error = err;
102 static int sdei_to_linux_errno(unsigned long sdei_err)
105 case SDEI_NOT_SUPPORTED:
107 case SDEI_INVALID_PARAMETERS:
113 case SDEI_OUT_OF_RESOURCE:
117 /* Not an error value ... */
122 * If x0 is any of these values, then the call failed, use sdei_to_linux_errno()
125 static int sdei_is_err(struct arm_smccc_res *res)
128 case SDEI_NOT_SUPPORTED:
129 case SDEI_INVALID_PARAMETERS:
132 case SDEI_OUT_OF_RESOURCE:
139 static int invoke_sdei_fn(unsigned long function_id, unsigned long arg0,
140 unsigned long arg1, unsigned long arg2,
141 unsigned long arg3, unsigned long arg4,
145 struct arm_smccc_res res;
147 if (sdei_firmware_call) {
148 sdei_firmware_call(function_id, arg0, arg1, arg2, arg3, arg4,
150 if (sdei_is_err(&res))
151 err = sdei_to_linux_errno(res.a0);
154 * !sdei_firmware_call means we failed to probe or called
155 * sdei_mark_interface_broken(). -EIO is not an error returned
156 * by sdei_to_linux_errno() and is used to suppress messages
160 res.a0 = SDEI_NOT_SUPPORTED;
168 NOKPROBE_SYMBOL(invoke_sdei_fn);
170 static struct sdei_event *sdei_event_find(u32 event_num)
172 struct sdei_event *e, *found = NULL;
174 lockdep_assert_held(&sdei_events_lock);
176 spin_lock(&sdei_list_lock);
177 list_for_each_entry(e, &sdei_list, list) {
178 if (e->event_num == event_num) {
183 spin_unlock(&sdei_list_lock);
188 int sdei_api_event_context(u32 query, u64 *result)
190 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_CONTEXT, query, 0, 0, 0, 0,
193 NOKPROBE_SYMBOL(sdei_api_event_context);
195 static int sdei_api_event_get_info(u32 event, u32 info, u64 *result)
197 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_GET_INFO, event, info, 0,
201 static struct sdei_event *sdei_event_create(u32 event_num,
202 sdei_event_callback *cb,
207 struct sdei_event *event;
208 struct sdei_registered_event *reg;
210 lockdep_assert_held(&sdei_events_lock);
212 event = kzalloc(sizeof(*event), GFP_KERNEL);
214 return ERR_PTR(-ENOMEM);
216 INIT_LIST_HEAD(&event->list);
217 event->event_num = event_num;
219 err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY,
225 event->priority = result;
227 err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_TYPE,
233 event->type = result;
235 if (event->type == SDEI_EVENT_TYPE_SHARED) {
236 reg = kzalloc(sizeof(*reg), GFP_KERNEL);
239 return ERR_PTR(-ENOMEM);
242 reg->event_num = event_num;
243 reg->priority = event->priority;
246 reg->callback_arg = cb_arg;
247 event->registered = reg;
250 struct sdei_registered_event __percpu *regs;
252 regs = alloc_percpu(struct sdei_registered_event);
255 return ERR_PTR(-ENOMEM);
258 for_each_possible_cpu(cpu) {
259 reg = per_cpu_ptr(regs, cpu);
261 reg->event_num = event->event_num;
262 reg->priority = event->priority;
264 reg->callback_arg = cb_arg;
267 event->private_registered = regs;
270 if (sdei_event_find(event_num)) {
271 kfree(event->registered);
273 event = ERR_PTR(-EBUSY);
275 spin_lock(&sdei_list_lock);
276 list_add(&event->list, &sdei_list);
277 spin_unlock(&sdei_list_lock);
283 static void sdei_event_destroy(struct sdei_event *event)
285 lockdep_assert_held(&sdei_events_lock);
287 spin_lock(&sdei_list_lock);
288 list_del(&event->list);
289 spin_unlock(&sdei_list_lock);
291 if (event->type == SDEI_EVENT_TYPE_SHARED)
292 kfree(event->registered);
294 free_percpu(event->private_registered);
299 static int sdei_api_get_version(u64 *version)
301 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_VERSION, 0, 0, 0, 0, 0, version);
304 int sdei_mask_local_cpu(void)
308 WARN_ON_ONCE(preemptible());
310 err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_MASK, 0, 0, 0, 0, 0, NULL);
311 if (err && err != -EIO) {
312 pr_warn_once("failed to mask CPU[%u]: %d\n",
313 smp_processor_id(), err);
320 static void _ipi_mask_cpu(void *ignored)
322 sdei_mask_local_cpu();
325 int sdei_unmask_local_cpu(void)
329 WARN_ON_ONCE(preemptible());
331 err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_UNMASK, 0, 0, 0, 0, 0, NULL);
332 if (err && err != -EIO) {
333 pr_warn_once("failed to unmask CPU[%u]: %d\n",
334 smp_processor_id(), err);
341 static void _ipi_unmask_cpu(void *ignored)
343 sdei_unmask_local_cpu();
346 static void _ipi_private_reset(void *ignored)
350 err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PRIVATE_RESET, 0, 0, 0, 0, 0,
352 if (err && err != -EIO)
353 pr_warn_once("failed to reset CPU[%u]: %d\n",
354 smp_processor_id(), err);
357 static int sdei_api_shared_reset(void)
359 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_SHARED_RESET, 0, 0, 0, 0, 0,
363 static void sdei_mark_interface_broken(void)
365 pr_err("disabling SDEI firmware interface\n");
366 on_each_cpu(&_ipi_mask_cpu, NULL, true);
367 sdei_firmware_call = NULL;
370 static int sdei_platform_reset(void)
374 on_each_cpu(&_ipi_private_reset, NULL, true);
375 err = sdei_api_shared_reset();
377 pr_err("Failed to reset platform: %d\n", err);
378 sdei_mark_interface_broken();
384 static int sdei_api_event_enable(u32 event_num)
386 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_ENABLE, event_num, 0, 0, 0,
390 /* Called directly by the hotplug callbacks */
391 static void _local_event_enable(void *data)
394 struct sdei_crosscall_args *arg = data;
396 WARN_ON_ONCE(preemptible());
398 err = sdei_api_event_enable(arg->event->event_num);
400 sdei_cross_call_return(arg, err);
403 int sdei_event_enable(u32 event_num)
406 struct sdei_event *event;
408 mutex_lock(&sdei_events_lock);
409 event = sdei_event_find(event_num);
411 mutex_unlock(&sdei_events_lock);
415 spin_lock(&sdei_list_lock);
416 event->reenable = true;
417 spin_unlock(&sdei_list_lock);
419 if (event->type == SDEI_EVENT_TYPE_SHARED)
420 err = sdei_api_event_enable(event->event_num);
422 err = sdei_do_cross_call(_local_event_enable, event);
423 mutex_unlock(&sdei_events_lock);
427 EXPORT_SYMBOL(sdei_event_enable);
429 static int sdei_api_event_disable(u32 event_num)
431 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_DISABLE, event_num, 0, 0,
435 static void _ipi_event_disable(void *data)
438 struct sdei_crosscall_args *arg = data;
440 err = sdei_api_event_disable(arg->event->event_num);
442 sdei_cross_call_return(arg, err);
445 int sdei_event_disable(u32 event_num)
448 struct sdei_event *event;
450 mutex_lock(&sdei_events_lock);
451 event = sdei_event_find(event_num);
453 mutex_unlock(&sdei_events_lock);
457 spin_lock(&sdei_list_lock);
458 event->reenable = false;
459 spin_unlock(&sdei_list_lock);
461 if (event->type == SDEI_EVENT_TYPE_SHARED)
462 err = sdei_api_event_disable(event->event_num);
464 err = sdei_do_cross_call(_ipi_event_disable, event);
465 mutex_unlock(&sdei_events_lock);
469 EXPORT_SYMBOL(sdei_event_disable);
471 static int sdei_api_event_unregister(u32 event_num)
473 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_UNREGISTER, event_num, 0,
477 /* Called directly by the hotplug callbacks */
478 static void _local_event_unregister(void *data)
481 struct sdei_crosscall_args *arg = data;
483 WARN_ON_ONCE(preemptible());
485 err = sdei_api_event_unregister(arg->event->event_num);
487 sdei_cross_call_return(arg, err);
490 static int _sdei_event_unregister(struct sdei_event *event)
492 lockdep_assert_held(&sdei_events_lock);
494 spin_lock(&sdei_list_lock);
495 event->reregister = false;
496 event->reenable = false;
497 spin_unlock(&sdei_list_lock);
499 if (event->type == SDEI_EVENT_TYPE_SHARED)
500 return sdei_api_event_unregister(event->event_num);
502 return sdei_do_cross_call(_local_event_unregister, event);
505 int sdei_event_unregister(u32 event_num)
508 struct sdei_event *event;
512 mutex_lock(&sdei_events_lock);
513 event = sdei_event_find(event_num);
516 pr_warn("Event %u not registered\n", event_num);
521 err = _sdei_event_unregister(event);
525 sdei_event_destroy(event);
527 mutex_unlock(&sdei_events_lock);
531 EXPORT_SYMBOL(sdei_event_unregister);
534 * unregister events, but don't destroy them as they are re-registered by
535 * sdei_reregister_shared().
537 static int sdei_unregister_shared(void)
540 struct sdei_event *event;
542 mutex_lock(&sdei_events_lock);
543 spin_lock(&sdei_list_lock);
544 list_for_each_entry(event, &sdei_list, list) {
545 if (event->type != SDEI_EVENT_TYPE_SHARED)
548 err = _sdei_event_unregister(event);
552 spin_unlock(&sdei_list_lock);
553 mutex_unlock(&sdei_events_lock);
558 static int sdei_api_event_register(u32 event_num, unsigned long entry_point,
559 void *arg, u64 flags, u64 affinity)
561 return invoke_sdei_fn(SDEI_1_0_FN_SDEI_EVENT_REGISTER, event_num,
562 (unsigned long)entry_point, (unsigned long)arg,
563 flags, affinity, NULL);
566 /* Called directly by the hotplug callbacks */
567 static void _local_event_register(void *data)
570 struct sdei_registered_event *reg;
571 struct sdei_crosscall_args *arg = data;
573 WARN_ON(preemptible());
575 reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());
576 err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,
579 sdei_cross_call_return(arg, err);
582 static int _sdei_event_register(struct sdei_event *event)
586 lockdep_assert_held(&sdei_events_lock);
588 spin_lock(&sdei_list_lock);
589 event->reregister = true;
590 spin_unlock(&sdei_list_lock);
592 if (event->type == SDEI_EVENT_TYPE_SHARED)
593 return sdei_api_event_register(event->event_num,
596 SDEI_EVENT_REGISTER_RM_ANY, 0);
599 err = sdei_do_cross_call(_local_event_register, event);
601 spin_lock(&sdei_list_lock);
602 event->reregister = false;
603 event->reenable = false;
604 spin_unlock(&sdei_list_lock);
606 sdei_do_cross_call(_local_event_unregister, event);
612 int sdei_event_register(u32 event_num, sdei_event_callback *cb, void *arg)
615 struct sdei_event *event;
619 mutex_lock(&sdei_events_lock);
621 if (sdei_event_find(event_num)) {
622 pr_warn("Event %u already registered\n", event_num);
627 event = sdei_event_create(event_num, cb, arg);
629 err = PTR_ERR(event);
630 pr_warn("Failed to create event %u: %d\n", event_num,
635 err = _sdei_event_register(event);
637 sdei_event_destroy(event);
638 pr_warn("Failed to register event %u: %d\n", event_num,
642 mutex_unlock(&sdei_events_lock);
646 EXPORT_SYMBOL(sdei_event_register);
648 static int sdei_reregister_event(struct sdei_event *event)
652 lockdep_assert_held(&sdei_events_lock);
654 err = _sdei_event_register(event);
656 pr_err("Failed to re-register event %u\n", event->event_num);
657 sdei_event_destroy(event);
661 if (event->reenable) {
662 if (event->type == SDEI_EVENT_TYPE_SHARED)
663 err = sdei_api_event_enable(event->event_num);
665 err = sdei_do_cross_call(_local_event_enable, event);
669 pr_err("Failed to re-enable event %u\n", event->event_num);
674 static int sdei_reregister_shared(void)
677 struct sdei_event *event;
679 mutex_lock(&sdei_events_lock);
680 spin_lock(&sdei_list_lock);
681 list_for_each_entry(event, &sdei_list, list) {
682 if (event->type != SDEI_EVENT_TYPE_SHARED)
685 if (event->reregister) {
686 err = sdei_reregister_event(event);
691 spin_unlock(&sdei_list_lock);
692 mutex_unlock(&sdei_events_lock);
697 static int sdei_cpuhp_down(unsigned int cpu)
699 struct sdei_event *event;
700 struct sdei_crosscall_args arg;
702 /* un-register private events */
703 spin_lock(&sdei_list_lock);
704 list_for_each_entry(event, &sdei_list, list) {
705 if (event->type == SDEI_EVENT_TYPE_SHARED)
708 CROSSCALL_INIT(arg, event);
709 /* call the cross-call function locally... */
710 _local_event_unregister(&arg);
712 pr_err("Failed to unregister event %u: %d\n",
713 event->event_num, arg.first_error);
715 spin_unlock(&sdei_list_lock);
717 return sdei_mask_local_cpu();
720 static int sdei_cpuhp_up(unsigned int cpu)
722 struct sdei_event *event;
723 struct sdei_crosscall_args arg;
725 /* re-register/enable private events */
726 spin_lock(&sdei_list_lock);
727 list_for_each_entry(event, &sdei_list, list) {
728 if (event->type == SDEI_EVENT_TYPE_SHARED)
731 if (event->reregister) {
732 CROSSCALL_INIT(arg, event);
733 /* call the cross-call function locally... */
734 _local_event_register(&arg);
736 pr_err("Failed to re-register event %u: %d\n",
737 event->event_num, arg.first_error);
740 if (event->reenable) {
741 CROSSCALL_INIT(arg, event);
742 _local_event_enable(&arg);
744 pr_err("Failed to re-enable event %u: %d\n",
745 event->event_num, arg.first_error);
748 spin_unlock(&sdei_list_lock);
750 return sdei_unmask_local_cpu();
753 /* When entering idle, mask/unmask events for this cpu */
754 static int sdei_pm_notifier(struct notifier_block *nb, unsigned long action,
761 rv = sdei_mask_local_cpu();
764 case CPU_PM_ENTER_FAILED:
765 rv = sdei_unmask_local_cpu();
772 return notifier_from_errno(rv);
777 static struct notifier_block sdei_pm_nb = {
778 .notifier_call = sdei_pm_notifier,
781 static int sdei_device_suspend(struct device *dev)
783 on_each_cpu(_ipi_mask_cpu, NULL, true);
788 static int sdei_device_resume(struct device *dev)
790 on_each_cpu(_ipi_unmask_cpu, NULL, true);
796 * We need all events to be reregistered when we resume from hibernate.
798 * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister
799 * events during freeze, then re-register and re-enable them during thaw
802 static int sdei_device_freeze(struct device *dev)
806 /* unregister private events */
807 cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
809 err = sdei_unregister_shared();
816 static int sdei_device_thaw(struct device *dev)
820 /* re-register shared events */
821 err = sdei_reregister_shared();
823 pr_warn("Failed to re-register shared events...\n");
824 sdei_mark_interface_broken();
828 err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
829 &sdei_cpuhp_up, &sdei_cpuhp_down);
831 pr_warn("Failed to re-register CPU hotplug notifier...\n");
836 static int sdei_device_restore(struct device *dev)
840 err = sdei_platform_reset();
844 return sdei_device_thaw(dev);
847 static const struct dev_pm_ops sdei_pm_ops = {
848 .suspend = sdei_device_suspend,
849 .resume = sdei_device_resume,
850 .freeze = sdei_device_freeze,
851 .thaw = sdei_device_thaw,
852 .restore = sdei_device_restore,
856 * Mask all CPUs and unregister all events on panic, reboot or kexec.
858 static int sdei_reboot_notifier(struct notifier_block *nb, unsigned long action,
862 * We are going to reset the interface, after this there is no point
863 * doing work when we take CPUs offline.
865 cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
867 sdei_platform_reset();
872 static struct notifier_block sdei_reboot_nb = {
873 .notifier_call = sdei_reboot_notifier,
876 static void sdei_smccc_smc(unsigned long function_id,
877 unsigned long arg0, unsigned long arg1,
878 unsigned long arg2, unsigned long arg3,
879 unsigned long arg4, struct arm_smccc_res *res)
881 arm_smccc_smc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res);
883 NOKPROBE_SYMBOL(sdei_smccc_smc);
885 static void sdei_smccc_hvc(unsigned long function_id,
886 unsigned long arg0, unsigned long arg1,
887 unsigned long arg2, unsigned long arg3,
888 unsigned long arg4, struct arm_smccc_res *res)
890 arm_smccc_hvc(function_id, arg0, arg1, arg2, arg3, arg4, 0, 0, res);
892 NOKPROBE_SYMBOL(sdei_smccc_hvc);
894 int sdei_register_ghes(struct ghes *ghes, sdei_event_callback *normal_cb,
895 sdei_event_callback *critical_cb)
900 sdei_event_callback *cb;
902 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
905 event_num = ghes->generic->notify.vector;
906 if (event_num == 0) {
908 * Event 0 is reserved by the specification for
914 err = sdei_api_event_get_info(event_num, SDEI_EVENT_INFO_EV_PRIORITY,
919 if (result == SDEI_EVENT_PRIORITY_CRITICAL)
924 err = sdei_event_register(event_num, cb, ghes);
926 err = sdei_event_enable(event_num);
931 int sdei_unregister_ghes(struct ghes *ghes)
935 u32 event_num = ghes->generic->notify.vector;
939 if (!IS_ENABLED(CONFIG_ACPI_APEI_GHES))
943 * The event may be running on another CPU. Disable it
944 * to stop new events, then try to unregister a few times.
946 err = sdei_event_disable(event_num);
950 for (i = 0; i < 3; i++) {
951 err = sdei_event_unregister(event_num);
952 if (err != -EINPROGRESS)
961 static int sdei_get_conduit(struct platform_device *pdev)
964 struct device_node *np = pdev->dev.of_node;
966 sdei_firmware_call = NULL;
968 if (of_property_read_string(np, "method", &method)) {
969 pr_warn("missing \"method\" property\n");
970 return CONDUIT_INVALID;
973 if (!strcmp("hvc", method)) {
974 sdei_firmware_call = &sdei_smccc_hvc;
976 } else if (!strcmp("smc", method)) {
977 sdei_firmware_call = &sdei_smccc_smc;
981 pr_warn("invalid \"method\" property: %s\n", method);
982 } else if (IS_ENABLED(CONFIG_ACPI) && !acpi_disabled) {
983 if (acpi_psci_use_hvc()) {
984 sdei_firmware_call = &sdei_smccc_hvc;
987 sdei_firmware_call = &sdei_smccc_smc;
992 return CONDUIT_INVALID;
995 static int sdei_probe(struct platform_device *pdev)
1001 conduit = sdei_get_conduit(pdev);
1002 if (!sdei_firmware_call)
1005 err = sdei_api_get_version(&ver);
1006 if (err == -EOPNOTSUPP)
1007 pr_err("advertised but not implemented in platform firmware\n");
1009 pr_err("Failed to get SDEI version: %d\n", err);
1010 sdei_mark_interface_broken();
1014 pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n",
1015 (int)SDEI_VERSION_MAJOR(ver), (int)SDEI_VERSION_MINOR(ver),
1016 (int)SDEI_VERSION_VENDOR(ver));
1018 if (SDEI_VERSION_MAJOR(ver) != 1) {
1019 pr_warn("Conflicting SDEI version detected.\n");
1020 sdei_mark_interface_broken();
1024 err = sdei_platform_reset();
1028 sdei_entry_point = sdei_arch_get_entry_point(conduit);
1029 if (!sdei_entry_point) {
1030 /* Not supported due to hardware or boot configuration */
1031 sdei_mark_interface_broken();
1035 err = cpu_pm_register_notifier(&sdei_pm_nb);
1037 pr_warn("Failed to register CPU PM notifier...\n");
1041 err = register_reboot_notifier(&sdei_reboot_nb);
1043 pr_warn("Failed to register reboot notifier...\n");
1047 err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
1048 &sdei_cpuhp_up, &sdei_cpuhp_down);
1050 pr_warn("Failed to register CPU hotplug notifier...\n");
1057 unregister_reboot_notifier(&sdei_reboot_nb);
1060 cpu_pm_unregister_notifier(&sdei_pm_nb);
1063 sdei_mark_interface_broken();
1067 static const struct of_device_id sdei_of_match[] = {
1068 { .compatible = "arm,sdei-1.0" },
1072 static struct platform_driver sdei_driver = {
1076 .of_match_table = sdei_of_match,
1078 .probe = sdei_probe,
1081 static bool __init sdei_present_dt(void)
1083 struct device_node *np, *fw_np;
1085 fw_np = of_find_node_by_name(NULL, "firmware");
1089 np = of_find_matching_node(fw_np, sdei_of_match);
1097 static bool __init sdei_present_acpi(void)
1100 struct platform_device *pdev;
1101 struct acpi_table_header *sdei_table_header;
1106 status = acpi_get_table(ACPI_SIG_SDEI, 0, &sdei_table_header);
1107 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
1108 const char *msg = acpi_format_exception(status);
1110 pr_info("Failed to get ACPI:SDEI table, %s\n", msg);
1112 if (ACPI_FAILURE(status))
1115 pdev = platform_device_register_simple(sdei_driver.driver.name, 0, NULL,
1123 static int __init sdei_init(void)
1125 if (sdei_present_dt() || sdei_present_acpi())
1126 platform_driver_register(&sdei_driver);
1132 * On an ACPI system SDEI needs to be ready before HEST:GHES tries to register
1133 * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised
1134 * by device_initcall(). We want to be called in the middle.
1136 subsys_initcall_sync(sdei_init);
1138 int sdei_event_handler(struct pt_regs *regs,
1139 struct sdei_registered_event *arg)
1142 mm_segment_t orig_addr_limit;
1143 u32 event_num = arg->event_num;
1145 orig_addr_limit = get_fs();
1148 err = arg->callback(event_num, regs, arg->callback_arg);
1150 pr_err_ratelimited("event %u on CPU %u failed with error: %d\n",
1151 event_num, smp_processor_id(), err);
1153 set_fs(orig_addr_limit);
1157 NOKPROBE_SYMBOL(sdei_event_handler);