1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2014 Intel Corporation; author Matt Fleming
4*4882a593Smuzhiyun * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun #include <linux/efi.h>
7*4882a593Smuzhiyun #include <linux/reboot.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun static void (*orig_pm_power_off)(void);
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun int efi_reboot_quirk_mode = -1;
12*4882a593Smuzhiyun
efi_reboot(enum reboot_mode reboot_mode,const char * __unused)13*4882a593Smuzhiyun void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun const char *str[] = { "cold", "warm", "shutdown", "platform" };
16*4882a593Smuzhiyun int efi_mode, cap_reset_mode;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
19*4882a593Smuzhiyun return;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun switch (reboot_mode) {
22*4882a593Smuzhiyun case REBOOT_WARM:
23*4882a593Smuzhiyun case REBOOT_SOFT:
24*4882a593Smuzhiyun efi_mode = EFI_RESET_WARM;
25*4882a593Smuzhiyun break;
26*4882a593Smuzhiyun default:
27*4882a593Smuzhiyun efi_mode = EFI_RESET_COLD;
28*4882a593Smuzhiyun break;
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun /*
32*4882a593Smuzhiyun * If a quirk forced an EFI reset mode, always use that.
33*4882a593Smuzhiyun */
34*4882a593Smuzhiyun if (efi_reboot_quirk_mode != -1)
35*4882a593Smuzhiyun efi_mode = efi_reboot_quirk_mode;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (efi_capsule_pending(&cap_reset_mode)) {
38*4882a593Smuzhiyun if (efi_mode != cap_reset_mode)
39*4882a593Smuzhiyun printk(KERN_CRIT "efi: %s reset requested but pending "
40*4882a593Smuzhiyun "capsule update requires %s reset... Performing "
41*4882a593Smuzhiyun "%s reset.\n", str[efi_mode], str[cap_reset_mode],
42*4882a593Smuzhiyun str[cap_reset_mode]);
43*4882a593Smuzhiyun efi_mode = cap_reset_mode;
44*4882a593Smuzhiyun }
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
efi_poweroff_required(void)49*4882a593Smuzhiyun bool __weak efi_poweroff_required(void)
50*4882a593Smuzhiyun {
51*4882a593Smuzhiyun return false;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
efi_power_off(void)54*4882a593Smuzhiyun static void efi_power_off(void)
55*4882a593Smuzhiyun {
56*4882a593Smuzhiyun efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
57*4882a593Smuzhiyun /*
58*4882a593Smuzhiyun * The above call should not return, if it does fall back to
59*4882a593Smuzhiyun * the original power off method (typically ACPI poweroff).
60*4882a593Smuzhiyun */
61*4882a593Smuzhiyun if (orig_pm_power_off)
62*4882a593Smuzhiyun orig_pm_power_off();
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
efi_shutdown_init(void)65*4882a593Smuzhiyun static int __init efi_shutdown_init(void)
66*4882a593Smuzhiyun {
67*4882a593Smuzhiyun if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
68*4882a593Smuzhiyun return -ENODEV;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (efi_poweroff_required()) {
71*4882a593Smuzhiyun orig_pm_power_off = pm_power_off;
72*4882a593Smuzhiyun pm_power_off = efi_power_off;
73*4882a593Smuzhiyun }
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun return 0;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun late_initcall(efi_shutdown_init);
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