1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/arm-smccc.h>
37  * The call to use to reach the firmware.
44 /* entry point from firmware to arch asm code */
59 	/* This pointer is handed to firmware as the event argument. */
115 	if (err && (atomic_inc_return(&arg->errors) == 1))  in sdei_cross_call_return()
116 		arg->first_error = err;  in sdei_cross_call_return()
123 		return -EOPNOTSUPP;  in sdei_to_linux_errno()
125 		return -EINVAL;  in sdei_to_linux_errno()
127 		return -EPERM;  in sdei_to_linux_errno()
129 		return -EINPROGRESS;  in sdei_to_linux_errno()
131 		return -ENOMEM;  in sdei_to_linux_errno()
152 		 * sdei_mark_interface_broken(). -EIO is not an error returned  in invoke_sdei_fn()
156 		err = -EIO;  in invoke_sdei_fn()
175 		if (e->event_num == event_num) {  in sdei_event_find()
211 		err = -ENOMEM;  in sdei_event_create()
215 	INIT_LIST_HEAD(&event->list);  in sdei_event_create()
216 	event->event_num = event_num;  in sdei_event_create()
222 	event->priority = result;  in sdei_event_create()
228 	event->type = result;  in sdei_event_create()
230 	if (event->type == SDEI_EVENT_TYPE_SHARED) {  in sdei_event_create()
233 			err = -ENOMEM;  in sdei_event_create()
237 		reg->event_num = event->event_num;  in sdei_event_create()
238 		reg->priority = event->priority;  in sdei_event_create()
240 		reg->callback = cb;  in sdei_event_create()
241 		reg->callback_arg = cb_arg;  in sdei_event_create()
242 		event->registered = reg;  in sdei_event_create()
249 			err = -ENOMEM;  in sdei_event_create()
256 			reg->event_num = event->event_num;  in sdei_event_create()
257 			reg->priority = event->priority;  in sdei_event_create()
258 			reg->callback = cb;  in sdei_event_create()
259 			reg->callback_arg = cb_arg;  in sdei_event_create()
262 		event->private_registered = regs;  in sdei_event_create()
266 	list_add(&event->list, &sdei_list);  in sdei_event_create()
281 	list_del(&event->list);  in sdei_event_destroy_llocked()
283 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_destroy_llocked()
284 		kfree(event->registered);  in sdei_event_destroy_llocked()
286 		free_percpu(event->private_registered);  in sdei_event_destroy_llocked()
308 	if (err && err != -EIO) {  in sdei_mask_local_cpu()
328 	if (err && err != -EIO) {  in sdei_unmask_local_cpu()
351 	if (err && err != -EIO)  in _ipi_private_reset()
364 	pr_err("disabling SDEI firmware interface\n");  in sdei_mark_interface_broken()
395 	err = sdei_api_event_enable(arg->event->event_num);  in _local_event_enable()
402 	int err = -EINVAL;  in sdei_event_enable()
409 		return -ENOENT;  in sdei_event_enable()
414 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_enable()
415 		err = sdei_api_event_enable(event->event_num);  in sdei_event_enable()
421 		event->reenable = true;  in sdei_event_enable()
441 	err = sdei_api_event_disable(arg->event->event_num);  in _ipi_event_disable()
448 	int err = -EINVAL;  in sdei_event_disable()
455 		return -ENOENT;  in sdei_event_disable()
459 	event->reenable = false;  in sdei_event_disable()
462 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_disable()
463 		err = sdei_api_event_disable(event->event_num);  in sdei_event_disable()
483 	err = sdei_api_event_unregister(arg->event->event_num);  in _local_event_unregister()
499 		err = -ENOENT;  in sdei_event_unregister()
504 	event->reregister = false;  in sdei_event_unregister()
505 	event->reenable = false;  in sdei_event_unregister()
508 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_unregister()
509 		err = sdei_api_event_unregister(event->event_num);  in sdei_event_unregister()
524  * unregister events, but don't destroy them as they are re-registered by
535 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_unregister_shared()
538 		err = sdei_api_event_unregister(event->event_num);  in sdei_unregister_shared()
563 	reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());  in _local_event_register()
564 	err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,  in _local_event_register()
580 		err = -EBUSY;  in sdei_event_register()
592 	if (event->type == SDEI_EVENT_TYPE_SHARED) {  in sdei_event_register()
593 		err = sdei_api_event_register(event->event_num,  in sdei_event_register()
595 					      event->registered,  in sdei_event_register()
610 	event->reregister = true;  in sdei_event_register()
627 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_reregister_shared()
630 		if (event->reregister) {  in sdei_reregister_shared()
631 			err = sdei_api_event_register(event->event_num,  in sdei_reregister_shared()
632 					sdei_entry_point, event->registered,  in sdei_reregister_shared()
635 				pr_err("Failed to re-register event %u\n",  in sdei_reregister_shared()
636 				       event->event_num);  in sdei_reregister_shared()
642 		if (event->reenable) {  in sdei_reregister_shared()
643 			err = sdei_api_event_enable(event->event_num);  in sdei_reregister_shared()
645 				pr_err("Failed to re-enable event %u\n",  in sdei_reregister_shared()
646 				       event->event_num);  in sdei_reregister_shared()
662 	/* un-register private events */  in sdei_cpuhp_down()
665 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_down()
671 			       event->event_num, err);  in sdei_cpuhp_down()
684 	/* re-register/enable private events */  in sdei_cpuhp_up()
687 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_up()
690 		if (event->reregister) {  in sdei_cpuhp_up()
693 				pr_err("Failed to re-register event %u: %d\n",  in sdei_cpuhp_up()
694 				       event->event_num, err);  in sdei_cpuhp_up()
698 		if (event->reenable) {  in sdei_cpuhp_up()
701 				pr_err("Failed to re-enable event %u: %d\n",  in sdei_cpuhp_up()
702 				       event->event_num, err);  in sdei_cpuhp_up()
758  * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister
759  * events during freeze, then re-register and re-enable them during thaw
780 	/* re-register shared events */  in sdei_device_thaw()
783 		pr_warn("Failed to re-register shared events...\n");  in sdei_device_thaw()
791 		pr_warn("Failed to re-register CPU hotplug notifier...\n");  in sdei_device_thaw()
866 		return -EOPNOTSUPP;  in sdei_register_ghes()
868 	event_num = ghes->generic->notify.vector;  in sdei_register_ghes()
874 		return -EINVAL;  in sdei_register_ghes()
898 	u32 event_num = ghes->generic->notify.vector;  in sdei_unregister_ghes()
903 		return -EOPNOTSUPP;  in sdei_unregister_ghes()
915 		if (err != -EINPROGRESS)  in sdei_unregister_ghes()
927 	struct device_node *np = pdev->dev.of_node;  in sdei_get_conduit()
975 	pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n",  in sdei_probe()
982 		return -EINVAL;  in sdei_probe()
1031 	{ .compatible = "arm,sdei-1.0" },
1089  * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised
1099 	u32 event_num = arg->event_num;  in sdei_event_handler()
1111 	err = arg->callback(event_num, regs, arg->callback_arg);  in sdei_event_handler()