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Diffstat (limited to 'drivers/firmware/efi/reboot.c')
-rw-r--r--drivers/firmware/efi/reboot.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/firmware/efi/reboot.c b/drivers/firmware/efi/reboot.c
new file mode 100644
index 0000000000..ceae84c19d
--- /dev/null
+++ b/drivers/firmware/efi/reboot.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2014 Intel Corporation; author Matt Fleming
+ * Copyright (c) 2014 Red Hat, Inc., Mark Salter <msalter@redhat.com>
+ */
+#include <linux/efi.h>
+#include <linux/reboot.h>
+
+static struct sys_off_handler *efi_sys_off_handler;
+
+int efi_reboot_quirk_mode = -1;
+
+void efi_reboot(enum reboot_mode reboot_mode, const char *__unused)
+{
+ const char *str[] = { "cold", "warm", "shutdown", "platform" };
+ int efi_mode, cap_reset_mode;
+
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
+ return;
+
+ switch (reboot_mode) {
+ case REBOOT_WARM:
+ case REBOOT_SOFT:
+ efi_mode = EFI_RESET_WARM;
+ break;
+ default:
+ efi_mode = EFI_RESET_COLD;
+ break;
+ }
+
+ /*
+ * If a quirk forced an EFI reset mode, always use that.
+ */
+ if (efi_reboot_quirk_mode != -1)
+ efi_mode = efi_reboot_quirk_mode;
+
+ if (efi_capsule_pending(&cap_reset_mode)) {
+ if (efi_mode != cap_reset_mode)
+ printk(KERN_CRIT "efi: %s reset requested but pending "
+ "capsule update requires %s reset... Performing "
+ "%s reset.\n", str[efi_mode], str[cap_reset_mode],
+ str[cap_reset_mode]);
+ efi_mode = cap_reset_mode;
+ }
+
+ efi.reset_system(efi_mode, EFI_SUCCESS, 0, NULL);
+}
+
+bool __weak efi_poweroff_required(void)
+{
+ return false;
+}
+
+static int efi_power_off(struct sys_off_data *data)
+{
+ efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, NULL);
+
+ return NOTIFY_DONE;
+}
+
+static int __init efi_shutdown_init(void)
+{
+ if (!efi_rt_services_supported(EFI_RT_SUPPORTED_RESET_SYSTEM))
+ return -ENODEV;
+
+ if (efi_poweroff_required()) {
+ /* SYS_OFF_PRIO_FIRMWARE + 1 so that it runs before acpi_power_off */
+ efi_sys_off_handler =
+ register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
+ SYS_OFF_PRIO_FIRMWARE + 1,
+ efi_power_off, NULL);
+ if (IS_ERR(efi_sys_off_handler))
+ return PTR_ERR(efi_sys_off_handler);
+ }
+
+ return 0;
+}
+late_initcall(efi_shutdown_init);