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
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(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
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(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}
78late_initcall(efi_shutdown_init);
79