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77 lines
1.8 KiB
77 lines
1.8 KiB
// 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 <[email protected]> |
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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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