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9b42f76ad5
Do not attempt to call EFI ResetSystem if the runtime supported mask tells us it is no longer functional at OS runtime. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2014 Intel Corporation; author Matt Fleming
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* Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com>
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*/
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#include <linux/efi.h>
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#include <linux/reboot.h>
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static void (*orig_pm_power_off)(void);
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int efi_reboot_quirk_mode = -1;
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void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
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{
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const char *str[] = { "cold", "warm", "shutdown", "platform" };
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int efi_mode, cap_reset_mode;
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if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
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return;
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switch (reboot_mode) {
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case REBOOT_WARM:
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case REBOOT_SOFT:
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efi_mode = EFI_RESET_WARM;
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break;
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default:
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efi_mode = EFI_RESET_COLD;
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break;
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}
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/*
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* If a quirk forced an EFI reset mode, always use that.
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*/
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if (efi_reboot_quirk_mode != -1)
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efi_mode = efi_reboot_quirk_mode;
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if (efi_capsule_pending(&cap_reset_mode)) {
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if (efi_mode != cap_reset_mode)
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printk(KERN_CRIT "efi: %s reset requested but pending "
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"capsule update requires %s reset... Performing "
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"%s reset.\n", str[efi_mode], str[cap_reset_mode],
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str[cap_reset_mode]);
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efi_mode = cap_reset_mode;
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}
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efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
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}
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bool __weak efi_poweroff_required(void)
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{
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return false;
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}
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static void efi_power_off(void)
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{
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efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
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/*
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* The above call should not return, if it does fall back to
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* the original power off method (typically ACPI poweroff).
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*/
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if (orig_pm_power_off)
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orig_pm_power_off();
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}
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static int __init efi_shutdown_init(void)
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{
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if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
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return -ENODEV;
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if (efi_poweroff_required()) {
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orig_pm_power_off = pm_power_off;
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pm_power_off = efi_power_off;
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}
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return 0;
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}
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late_initcall(efi_shutdown_init);
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