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(reset_type: &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(mode: SYS_OFF_MODE_POWER_OFF, |
70 | SYS_OFF_PRIO_FIRMWARE + 1, |
71 | callback: efi_power_off, NULL); |
72 | if (IS_ERR(ptr: efi_sys_off_handler)) |
73 | return PTR_ERR(ptr: efi_sys_off_handler); |
74 | } |
75 | |
76 | return 0; |
77 | } |
78 | late_initcall(efi_shutdown_init); |
79 | |