1 // SPDX-License-Identifier: GPL-2.0
7 #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. */
97 	if (err && (atomic_inc_return(&arg->errors) == 1))  in sdei_cross_call_return()
98 		arg->first_error = err;  in sdei_cross_call_return()
105 		return -EOPNOTSUPP;  in sdei_to_linux_errno()
107 		return -EINVAL;  in sdei_to_linux_errno()
109 		return -EPERM;  in sdei_to_linux_errno()
111 		return -EINPROGRESS;  in sdei_to_linux_errno()
113 		return -ENOMEM;  in sdei_to_linux_errno()
126 	switch (res->a0) {  in sdei_is_err()
154 		 * sdei_mark_interface_broken(). -EIO is not an error returned  in invoke_sdei_fn()
158 		err = -EIO;  in invoke_sdei_fn()
176 		if (e->event_num == event_num) {  in sdei_event_find()
212 		return ERR_PTR(-ENOMEM);  in sdei_event_create()
214 	INIT_LIST_HEAD(&event->list);  in sdei_event_create()
215 	event->event_num = event_num;  in sdei_event_create()
223 	event->priority = result;  in sdei_event_create()
231 	event->type = result;  in sdei_event_create()
233 	if (event->type == SDEI_EVENT_TYPE_SHARED) {  in sdei_event_create()
237 			return ERR_PTR(-ENOMEM);  in sdei_event_create()
240 		reg->event_num = event_num;  in sdei_event_create()
241 		reg->priority = event->priority;  in sdei_event_create()
243 		reg->callback = cb;  in sdei_event_create()
244 		reg->callback_arg = cb_arg;  in sdei_event_create()
245 		event->registered = reg;  in sdei_event_create()
253 			return ERR_PTR(-ENOMEM);  in sdei_event_create()
259 			reg->event_num = event->event_num;  in sdei_event_create()
260 			reg->priority = event->priority;  in sdei_event_create()
261 			reg->callback = cb;  in sdei_event_create()
262 			reg->callback_arg = cb_arg;  in sdei_event_create()
265 		event->private_registered = regs;  in sdei_event_create()
269 		kfree(event->registered);  in sdei_event_create()
271 		event = ERR_PTR(-EBUSY);  in sdei_event_create()
274 		list_add(&event->list, &sdei_list);  in sdei_event_create()
286 	list_del(&event->list);  in sdei_event_destroy()
289 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_destroy()
290 		kfree(event->registered);  in sdei_event_destroy()
292 		free_percpu(event->private_registered);  in sdei_event_destroy()
309 	if (err && err != -EIO) {  in sdei_mask_local_cpu()
330 	if (err && err != -EIO) {  in sdei_unmask_local_cpu()
350 	if (err && err != -EIO)  in _ipi_private_reset()
363 	pr_err("disabling SDEI firmware interface\n");  in sdei_mark_interface_broken()
396 	err = sdei_api_event_enable(arg->event->event_num);  in _local_event_enable()
403 	int err = -EINVAL;  in sdei_event_enable()
410 		return -ENOENT;  in sdei_event_enable()
415 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_enable()
416 		err = sdei_api_event_enable(event->event_num);  in sdei_event_enable()
422 		event->reenable = true;  in sdei_event_enable()
443 	err = sdei_api_event_disable(arg->event->event_num);  in _ipi_event_disable()
450 	int err = -EINVAL;  in sdei_event_disable()
457 		return -ENOENT;  in sdei_event_disable()
461 	event->reenable = false;  in sdei_event_disable()
464 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_event_disable()
465 		err = sdei_api_event_disable(event->event_num);  in sdei_event_disable()
488 	err = sdei_api_event_unregister(arg->event->event_num);  in _local_event_unregister()
497 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in _sdei_event_unregister()
498 		return sdei_api_event_unregister(event->event_num);  in _sdei_event_unregister()
515 			err = -ENOENT;  in sdei_event_unregister()
520 		event->reregister = false;  in sdei_event_unregister()
521 		event->reenable = false;  in sdei_event_unregister()
537  * unregister events, but don't destroy them as they are re-registered by
548 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_unregister_shared()
578 	reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());  in _local_event_register()
579 	err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,  in _local_event_register()
591 	if (event->type == SDEI_EVENT_TYPE_SHARED)  in _sdei_event_register()
592 		return sdei_api_event_register(event->event_num,  in _sdei_event_register()
594 					       event->registered,  in _sdei_event_register()
615 			err = -EBUSY;  in sdei_event_register()
635 			event->reregister = true;  in sdei_event_register()
654 		pr_err("Failed to re-register event %u\n", event->event_num);  in sdei_reregister_event()
659 	if (event->reenable) {  in sdei_reregister_event()
660 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_reregister_event()
661 			err = sdei_api_event_enable(event->event_num);  in sdei_reregister_event()
667 		pr_err("Failed to re-enable event %u\n", event->event_num);  in sdei_reregister_event()
680 		if (event->type != SDEI_EVENT_TYPE_SHARED)  in sdei_reregister_shared()
683 		if (event->reregister) {  in sdei_reregister_shared()
700 	/* un-register private events */  in sdei_cpuhp_down()
703 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_down()
707 		/* call the cross-call function locally... */  in sdei_cpuhp_down()
711 			       event->event_num, arg.first_error);  in sdei_cpuhp_down()
723 	/* re-register/enable private events */  in sdei_cpuhp_up()
726 		if (event->type == SDEI_EVENT_TYPE_SHARED)  in sdei_cpuhp_up()
729 		if (event->reregister) {  in sdei_cpuhp_up()
731 			/* call the cross-call function locally... */  in sdei_cpuhp_up()
734 				pr_err("Failed to re-register event %u: %d\n",  in sdei_cpuhp_up()
735 				       event->event_num, arg.first_error);  in sdei_cpuhp_up()
738 		if (event->reenable) {  in sdei_cpuhp_up()
742 				pr_err("Failed to re-enable event %u: %d\n",  in sdei_cpuhp_up()
743 				       event->event_num, arg.first_error);  in sdei_cpuhp_up()
796  * The sequence is freeze->thaw. Reboot. freeze->restore. We unregister
797  * events during freeze, then re-register and re-enable them during thaw
818 	/* re-register shared events */  in sdei_device_thaw()
821 		pr_warn("Failed to re-register shared events...\n");  in sdei_device_thaw()
829 		pr_warn("Failed to re-register CPU hotplug notifier...\n");  in sdei_device_thaw()
893 	struct device_node *np = pdev->dev.of_node;  in sdei_get_conduit()
935 	if (err == -EOPNOTSUPP)  in sdei_probe()
936 		pr_err("advertised but not implemented in platform firmware\n");  in sdei_probe()
943 	pr_info("SDEIv%d.%d (0x%x) detected in firmware.\n",  in sdei_probe()
950 		return -EINVAL;  in sdei_probe()
997 	{ .compatible = "arm,sdei-1.0" },
1014 	fw_np = of_find_node_by_name(NULL, "firmware");  in sdei_present_dt()
1062  * its events. ACPI is initialised from a subsys_initcall(), GHES is initialised
1072 	u32 event_num = arg->event_num;  in sdei_event_handler()
1077 	err = arg->callback(event_num, regs, arg->callback_arg);  in sdei_event_handler()