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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2014 Intel Corporation; author Matt Fleming4 * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com>5 */6#include <linux/efi.h>7#include <linux/reboot.h>8 9static struct sys_off_handler *efi_sys_off_handler;10 11int efi_reboot_quirk_mode = -1;12 13void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)14{15	const char *str[] = { "cold", "warm", "shutdown", "platform" };16	int efi_mode, cap_reset_mode;17 18	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))19		return;20 21	switch (reboot_mode) {22	case REBOOT_WARM:23	case REBOOT_SOFT:24		efi_mode = EFI_RESET_WARM;25		break;26	default:27		efi_mode = EFI_RESET_COLD;28		break;29	}30 31	/*32	 * If a quirk forced an EFI reset mode, always use that.33	 */34	if (efi_reboot_quirk_mode != -1)35		efi_mode = efi_reboot_quirk_mode;36 37	if (efi_capsule_pending(&cap_reset_mode)) {38		if (efi_mode != cap_reset_mode)39			printk(KERN_CRIT "efi: %s reset requested but pending "40			       "capsule update requires %s reset... Performing "41			       "%s reset.\n", str[efi_mode], str[cap_reset_mode],42			       str[cap_reset_mode]);43		efi_mode = cap_reset_mode;44	}45 46	efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);47}48 49bool __weak efi_poweroff_required(void)50{51	return false;52}53 54static int efi_power_off(struct sys_off_data *data)55{56	efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);57 58	return NOTIFY_DONE;59}60 61static int __init efi_shutdown_init(void)62{63	if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))64		return -ENODEV;65 66	if (efi_poweroff_required()) {67		/* SYS_OFF_PRIO_FIRMWARE + 1 so that it runs before acpi_power_off */68		efi_sys_off_handler =69			register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,70						 SYS_OFF_PRIO_FIRMWARE + 1,71						 efi_power_off, NULL);72		if (IS_ERR(efi_sys_off_handler))73			return PTR_ERR(efi_sys_off_handler);74	}75 76	return 0;77}78late_initcall(efi_shutdown_init);79