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 void (*orig_pm_power_off)(void);
10
11 int efi_reboot_quirk_mode = -1;
12
efi_reboot(enum reboot_mode reboot_mode,const char * __unused)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
efi_poweroff_required(void)49 bool __weak efi_poweroff_required(void)
50 {
51 return false;
52 }
53
efi_power_off(void)54 static void efi_power_off(void)
55 {
56 efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
57 /*
58 * The above call should not return, if it does fall back to
59 * the original power off method (typically ACPI poweroff).
60 */
61 if (orig_pm_power_off)
62 orig_pm_power_off();
63 }
64
efi_shutdown_init(void)65 static int __init efi_shutdown_init(void)
66 {
67 if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
68 return -ENODEV;
69
70 if (efi_poweroff_required()) {
71 orig_pm_power_off = pm_power_off;
72 pm_power_off = efi_power_off;
73 }
74
75 return 0;
76 }
77 late_initcall(efi_shutdown_init);
78