1 /* 2 * Copyright (C) 2014 Intel Corporation; author Matt Fleming 3 * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com> 4 */ 5 #include <linux/efi.h> 6 #include <linux/reboot.h> 7 8 static void (*orig_pm_power_off)(void); 9 10 int efi_reboot_quirk_mode = -1; 11 12 void efi_reboot(enum reboot_mode reboot_mode, const char *__unused) 13 { 14 const char *str[] = { "cold", "warm", "shutdown", "platform" }; 15 int efi_mode, cap_reset_mode; 16 17 if (!efi_enabled(EFI_RUNTIME_SERVICES)) 18 return; 19 20 switch (reboot_mode) { 21 case REBOOT_WARM: 22 case REBOOT_SOFT: 23 efi_mode = EFI_RESET_WARM; 24 break; 25 default: 26 efi_mode = EFI_RESET_COLD; 27 break; 28 } 29 30 /* 31 * If a quirk forced an EFI reset mode, always use that. 32 */ 33 if (efi_reboot_quirk_mode != -1) 34 efi_mode = efi_reboot_quirk_mode; 35 36 if (efi_capsule_pending(&cap_reset_mode)) { 37 if (efi_mode != cap_reset_mode) 38 printk(KERN_CRIT "efi: %s reset requested but pending " 39 "capsule update requires %s reset... Performing " 40 "%s reset.\n", str[efi_mode], str[cap_reset_mode], 41 str[cap_reset_mode]); 42 efi_mode = cap_reset_mode; 43 } 44 45 efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL); 46 } 47 48 bool __weak efi_poweroff_required(void) 49 { 50 return false; 51 } 52 53 static void efi_power_off(void) 54 { 55 efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL); 56 /* 57 * The above call should not return, if it does fall back to 58 * the original power off method (typically ACPI poweroff). 59 */ 60 if (orig_pm_power_off) 61 orig_pm_power_off(); 62 } 63 64 static int __init efi_shutdown_init(void) 65 { 66 if (!efi_enabled(EFI_RUNTIME_SERVICES)) 67 return -ENODEV; 68 69 if (efi_poweroff_required()) { 70 orig_pm_power_off = pm_power_off; 71 pm_power_off = efi_power_off; 72 } 73 74 return 0; 75 } 76 late_initcall(efi_shutdown_init); 77