1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2014 Intel Corporation; author Matt Fleming 4 * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com> 5 */ 6 #include <linux/efi.h> 7 #include <linux/reboot.h> 8 9 static struct sys_off_handler *efi_sys_off_handler; 10 11 int efi_reboot_quirk_mode = -1; 12 13 void 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 49 bool __weak efi_poweroff_required(void) 50 { 51 return false; 52 } 53 54 static 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 61 static 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 } 78 late_initcall(efi_shutdown_init); 79