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 void (*orig_pm_power_off)(void);
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(&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 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
65static 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}
77late_initcall(efi_shutdown_init);

 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 void (*orig_pm_power_off)(void);
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(&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 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
65static 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}
77late_initcall(efi_shutdown_init);