1 // SPDX-License-Identifier: GPL-2.0
8 #include <linux/arm-smccc.h>
36  * The call to use to reach the firmware.
43 /* entry point from firmware to arch asm code */
56 	/* This pointer is handed to firmware as the event argument. */
112 	if (err && (atomic_inc_return(&arg->errors) == 1))  in sdei_cross_call_return()
113 		arg->first_error = err;  in sdei_cross_call_return()
120 		return -EOPNOTSUPP;  in sdei_to_linux_errno()
122 		return -EINVAL;  in sdei_to_linux_errno()
124 		return -EPERM;  in sdei_to_linux_errno()
126 		return -EINPROGRESS;  in sdei_to_linux_errno()
128 		return -ENOMEM;  in sdei_to_linux_errno()
149 		 * sdei_mark_interface_broken(). -EIO is not an error returned  in invoke_sdei_fn()
153 		err = -EIO;  in invoke_sdei_fn()
172 		if (e->event_num == event_num) {  in sdei_event_find()
208 		err = -ENOMEM;  in sdei_event_create()
212 	INIT_LIST_HEAD(&event->list);  in sdei_event_create()
213 	event->event_num = event_num;  in sdei_event_create()
219 	event->priority = result;  in sdei_event_create()
225 	event->type = result;  in sdei_event_create()
227 	if (event->type == SDEI_EVENT_TYPE_SHARED) {  in sdei_event_create()
230 			err = -ENOMEM;  in sdei_event_create()
234 		reg->event_num = event->event_num;  in sdei_event_create()
235 		reg->priority = event->priority;  in sdei_event_create()
237 		reg->callback = cb;  in sdei_event_create()
238 		reg->callback_arg = cb_arg;  in sdei_event_create()
239 		event->registered = reg;  in sdei_event_create()
246 			err = -ENOMEM;  in sdei_event_create()
253 			reg->event_num = event->event_num;  in sdei_event_create()
254 			reg->priority = event->priority;  in sdei_event_create()
255 			reg->callback = cb;  in sdei_event_create()
256 			reg->callback_arg = cb_arg;  in sdei_event_create()
259 		event->private_registered = regs;  in sdei_event_create()
263 	list_add(&event->list, &sdei_list);  in sdei_event_create()
278 	list_del(&event->list);  in sdei_event_destroy_llocked()
280 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_destroy_llocked()
281 		kfree(event->registered);  in sdei_event_destroy_llocked()
283 		free_percpu(event->private_registered);  in sdei_event_destroy_llocked()
307 	if (err && err != -EIO) {  in sdei_mask_local_cpu()
328 	if (err && err != -EIO) {  in sdei_unmask_local_cpu()
348 	if (err && err != -EIO)  in _ipi_private_reset()
361 	pr_err("disabling SDEI firmware interface\n");  in sdei_mark_interface_broken()
394 	err = sdei_api_event_enable(arg->event->event_num);  in _local_event_enable()
401 	int err = -EINVAL;  in sdei_event_enable()
408 		return -ENOENT;  in sdei_event_enable()
413 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_enable()
414 		err = sdei_api_event_enable(event->event_num);  in sdei_event_enable()
420 		event->reenable = true;  in sdei_event_enable()
440 	err = sdei_api_event_disable(arg->event->event_num);  in _ipi_event_disable()
447 	int err = -EINVAL;  in sdei_event_disable()
454 		return -ENOENT;  in sdei_event_disable()
458 	event->reenable = false;  in sdei_event_disable()
461 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_disable()
462 		err = sdei_api_event_disable(event->event_num);  in sdei_event_disable()
484 	err = sdei_api_event_unregister(arg->event->event_num);  in _local_event_unregister()
500 		err = -ENOENT;  in sdei_event_unregister()
505 	event->reregister = false;  in sdei_event_unregister()
506 	event->reenable = false;  in sdei_event_unregister()
509 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_unregister()
510 		err = sdei_api_event_unregister(event->event_num);  in sdei_event_unregister()
525  * unregister events, but don't destroy them as they are re-registered by
536 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_unregister_shared()
539 		err = sdei_api_event_unregister(event->event_num);  in sdei_unregister_shared()
566 	reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());  in _local_event_register()
567 	err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,  in _local_event_register()
583 		err = -EBUSY;  in sdei_event_register()
595 	if (event->type == SDEI_EVENT_TYPE_SHARED) {  in sdei_event_register()
596 		err = sdei_api_event_register(event->event_num,  in sdei_event_register()
598 					      event->registered,  in sdei_event_register()
613 	event->reregister = true;  in sdei_event_register()
630 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_reregister_shared()
633 		if (event->reregister) {  in sdei_reregister_shared()
634 			err = sdei_api_event_register(event->event_num,  in sdei_reregister_shared()
635 					sdei_entry_point, event->registered,  in sdei_reregister_shared()
638 				pr_err("Failed to re-register event %u\n",  in sdei_reregister_shared()
639 				       event->event_num);  in sdei_reregister_shared()
645 		if (event->reenable) {  in sdei_reregister_shared()
646 			err = sdei_api_event_enable(event->event_num);  in sdei_reregister_shared()
648 				pr_err("Failed to re-enable event %u\n",  in sdei_reregister_shared()
649 				       event->event_num);  in sdei_reregister_shared()
665 	/* un-register private events */  in sdei_cpuhp_down()
668 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_down()
674 			       event->event_num, err);  in sdei_cpuhp_down()
687 	/* re-register/enable private events */  in sdei_cpuhp_up()
690 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_up()
693 		if (event->reregister) {  in sdei_cpuhp_up()
696 				pr_err("Failed to re-register event %u: %d\n",  in sdei_cpuhp_up()
697 				       event->event_num, err);  in sdei_cpuhp_up()
701 		if (event->reenable) {  in sdei_cpuhp_up()
704 				pr_err("Failed to re-enable event %u: %d\n",  in sdei_cpuhp_up()
705 				       event->event_num, err);  in sdei_cpuhp_up()
759  * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister
760  * events during freeze, then re-register and re-enable them during thaw
781 	/* re-register shared events */  in sdei_device_thaw()
784 		pr_warn("Failed to re-register shared events...\n");  in sdei_device_thaw()
792 		pr_warn("Failed to re-register CPU hotplug notifier...\n");  in sdei_device_thaw()
864 		return -EOPNOTSUPP;  in sdei_register_ghes()
866 	event_num = ghes->generic->notify.vector;  in sdei_register_ghes()
872 		return -EINVAL;  in sdei_register_ghes()
896 	u32 event_num = ghes->generic->notify.vector;  in sdei_unregister_ghes()
901 		return -EOPNOTSUPP;  in sdei_unregister_ghes()
913 		if (err != -EINPROGRESS)  in sdei_unregister_ghes()
925 	struct device_node *np = pdev->dev.of_node;  in sdei_get_conduit()
973 	pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n",  in sdei_probe()
980 		return -EINVAL;  in sdei_probe()
1027 	{ .compatible = "arm,sdei-1.0" },
1085  * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised
1094 	u32 event_num = arg->event_num;  in sdei_event_handler()
1096 	err = arg->callback(event_num, regs, arg->callback_arg);  in sdei_event_handler()