^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/kernel/reboot.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2013 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #define pr_fmt(fmt) "reboot: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/ctype.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kexec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/kmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/kmsg_dump.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/syscore_ops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * this indicates whether you can reboot with ctrl-alt-del: the default is yes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int C_A_D = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct pid *cad_pid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) EXPORT_SYMBOL(cad_pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #if defined(CONFIG_ARM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define DEFAULT_REBOOT_MODE = REBOOT_HARD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DEFAULT_REBOOT_MODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) EXPORT_SYMBOL_GPL(reboot_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) enum reboot_mode panic_reboot_mode = REBOOT_UNDEFINED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) EXPORT_SYMBOL_GPL(panic_reboot_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * This variable is used privately to keep track of whether or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * reboot_type is still set to its default value (i.e., reboot= hasn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * been set on the command line). This is needed so that we can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * suppress DMI scanning for reboot quirks. Without it, it's
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * impossible to override a faulty reboot quirk without recompiling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int reboot_default = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) int reboot_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) enum reboot_type reboot_type = BOOT_ACPI;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int reboot_force;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * If set, this is used for preparing the system to power off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void (*pm_power_off_prepare)(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) EXPORT_SYMBOL_GPL(pm_power_off_prepare);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * emergency_restart - reboot the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) * Without shutting down any hardware or taking any locks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) * reboot the system. This is called when we know we are in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * trouble so this is our best effort to reboot. This is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * safe to call in interrupt context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void emergency_restart(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) kmsg_dump(KMSG_DUMP_EMERG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) machine_emergency_restart();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) EXPORT_SYMBOL_GPL(emergency_restart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) void kernel_restart_prepare(char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) system_state = SYSTEM_RESTART;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) usermodehelper_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) device_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * register_reboot_notifier - Register function to be called at reboot time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * @nb: Info about notifier function to be called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * Registers a function with the list of functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * to be called at reboot time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Currently always returns zero, as blocking_notifier_chain_register()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * always returns zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) int register_reboot_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return blocking_notifier_chain_register(&reboot_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) EXPORT_SYMBOL(register_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) * unregister_reboot_notifier - Unregister previously registered reboot notifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * @nb: Hook to be unregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * Unregisters a previously registered reboot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * notifier function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * Returns zero on success, or %-ENOENT on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) int unregister_reboot_notifier(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) EXPORT_SYMBOL(unregister_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static void devm_unregister_reboot_notifier(struct device *dev, void *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) WARN_ON(unregister_reboot_notifier(*(struct notifier_block **)res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) int devm_register_reboot_notifier(struct device *dev, struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct notifier_block **rcnb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) rcnb = devres_alloc(devm_unregister_reboot_notifier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) sizeof(*rcnb), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!rcnb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) ret = register_reboot_notifier(nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) *rcnb = nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) devres_add(dev, rcnb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) devres_free(rcnb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) EXPORT_SYMBOL(devm_register_reboot_notifier);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * Notifier list for kernel code which wants to be called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) * to restart the system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static ATOMIC_NOTIFIER_HEAD(restart_handler_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * register_restart_handler - Register function to be called to reset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) * @nb: Info about handler function to be called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * @nb->priority: Handler priority. Handlers should follow the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * following guidelines for setting priorities.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * 0: Restart handler of last resort,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * with limited restart capabilities
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) * 128: Default restart handler; use if no other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * restart handler is expected to be available,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * and/or if restart functionality is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * sufficient to restart the entire system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) * 255: Highest priority restart handler, will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) * preempt all other restart handlers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * Registers a function with code to be called to restart the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * system.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * Registered functions will be called from machine_restart as last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * step of the restart sequence (if the architecture specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * machine_restart function calls do_kernel_restart - see below
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * for details).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * Registered functions are expected to restart the system immediately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * If more than one function is registered, the restart handler priority
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) * selects which function will be called first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) * Restart handlers are expected to be registered from non-architecture
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) * code, typically from drivers. A typical use case would be a system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) * where restart functionality is provided through a watchdog. Multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) * restart handlers may exist; for example, one restart handler might
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) * restart the entire system, while another only restarts the CPU.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * In such cases, the restart handler which only restarts part of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * hardware is expected to register with low priority to ensure that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * it only runs if no other means to restart the system is available.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * Currently always returns zero, as atomic_notifier_chain_register()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * always returns zero.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) int register_restart_handler(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return atomic_notifier_chain_register(&restart_handler_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) EXPORT_SYMBOL(register_restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * unregister_restart_handler - Unregister previously registered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * restart handler
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) * @nb: Hook to be unregistered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) * Unregisters a previously registered restart handler function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) * Returns zero on success, or %-ENOENT on failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int unregister_restart_handler(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return atomic_notifier_chain_unregister(&restart_handler_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) EXPORT_SYMBOL(unregister_restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * do_kernel_restart - Execute kernel restart handler call chain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * Calls functions registered with register_restart_handler.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * Expected to be called from machine_restart as last step of the restart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * sequence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) * Restarts the system immediately if a restart handler function has been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) * registered. Otherwise does nothing.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) void do_kernel_restart(char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) atomic_notifier_call_chain(&restart_handler_list, reboot_mode, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) #ifdef CONFIG_NO_GKI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static ATOMIC_NOTIFIER_HEAD(pre_restart_handler_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) int register_pre_restart_handler(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return atomic_notifier_chain_register(&pre_restart_handler_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) EXPORT_SYMBOL(register_pre_restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) int unregister_pre_restart_handler(struct notifier_block *nb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return atomic_notifier_chain_unregister(&pre_restart_handler_list, nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) EXPORT_SYMBOL(unregister_pre_restart_handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) void do_kernel_pre_restart(char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) atomic_notifier_call_chain(&pre_restart_handler_list, reboot_mode, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) void migrate_to_reboot_cpu(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) /* The boot cpu is always logical cpu 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) int cpu = reboot_cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) cpu_hotplug_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) /* Make certain the cpu I'm about to reboot on is online */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) if (!cpu_online(cpu))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) cpu = cpumask_first(cpu_online_mask);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) /* Prevent races with other tasks migrating this task */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) current->flags |= PF_NO_SETAFFINITY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /* Make certain I only run on the appropriate processor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) set_cpus_allowed_ptr(current, cpumask_of(cpu));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) * kernel_restart - reboot the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * @cmd: pointer to buffer containing command to execute for restart
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * or %NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) * Shutdown everything and perform a clean reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) * This is not safe to call in interrupt context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) void kernel_restart(char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) kernel_restart_prepare(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) migrate_to_reboot_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) syscore_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (!cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) pr_emerg("Restarting system\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) pr_emerg("Restarting system with command '%s'\n", cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) kmsg_dump(KMSG_DUMP_SHUTDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) machine_restart(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) EXPORT_SYMBOL_GPL(kernel_restart);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) static void kernel_shutdown_prepare(enum system_states state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) blocking_notifier_call_chain(&reboot_notifier_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) (state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) system_state = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) usermodehelper_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) device_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * kernel_halt - halt the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) * Shutdown everything and perform a clean system halt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) void kernel_halt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) kernel_shutdown_prepare(SYSTEM_HALT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) migrate_to_reboot_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) syscore_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) pr_emerg("System halted\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) kmsg_dump(KMSG_DUMP_SHUTDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) machine_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) EXPORT_SYMBOL_GPL(kernel_halt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * kernel_power_off - power_off the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) * Shutdown everything and perform a clean system power_off.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) void kernel_power_off(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) kernel_shutdown_prepare(SYSTEM_POWER_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) if (pm_power_off_prepare)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) pm_power_off_prepare();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) migrate_to_reboot_cpu();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) syscore_shutdown();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) pr_emerg("Power down\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) kmsg_dump(KMSG_DUMP_SHUTDOWN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) machine_power_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) EXPORT_SYMBOL_GPL(kernel_power_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) DEFINE_MUTEX(system_transition_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Reboot system call: for obvious reasons only root may call it,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) * and even root needs to set up some magic numbers in the registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * so that some mistake won't make this reboot the whole machine.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * You can also set the meaning of the ctrl-alt-del-key here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * reboot doesn't sync: do that yourself before calling this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) void __user *, arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) struct pid_namespace *pid_ns = task_active_pid_ns(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) char buffer[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) /* We only trust the superuser with rebooting the system. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) /* For safety, we require "magic" arguments. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (magic1 != LINUX_REBOOT_MAGIC1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) (magic2 != LINUX_REBOOT_MAGIC2 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) magic2 != LINUX_REBOOT_MAGIC2A &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) magic2 != LINUX_REBOOT_MAGIC2B &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) magic2 != LINUX_REBOOT_MAGIC2C))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * If pid namespaces are enabled and the current task is in a child
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) * pid_namespace, the command is handled by reboot_pid_ns() which will
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) * call do_exit().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) ret = reboot_pid_ns(pid_ns, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) /* Instead of trying to make the power_off code look like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) * halt when pm_power_off is not set do it the easy way.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) cmd = LINUX_REBOOT_CMD_HALT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) mutex_lock(&system_transition_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) switch (cmd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) case LINUX_REBOOT_CMD_RESTART:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) kernel_restart(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) case LINUX_REBOOT_CMD_CAD_ON:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) C_A_D = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) case LINUX_REBOOT_CMD_CAD_OFF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) C_A_D = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) case LINUX_REBOOT_CMD_HALT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) kernel_halt();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) do_exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) panic("cannot halt");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) case LINUX_REBOOT_CMD_POWER_OFF:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) kernel_power_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) do_exit(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) case LINUX_REBOOT_CMD_RESTART2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) ret = strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) ret = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) buffer[sizeof(buffer) - 1] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) kernel_restart(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) #ifdef CONFIG_KEXEC_CORE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) case LINUX_REBOOT_CMD_KEXEC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) ret = kernel_kexec();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) #ifdef CONFIG_HIBERNATION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) case LINUX_REBOOT_CMD_SW_SUSPEND:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) ret = hibernate();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) mutex_unlock(&system_transition_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) static void deferred_cad(struct work_struct *dummy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) kernel_restart(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) * As it's called within an interrupt, it may NOT sync: the only choice
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) * is whether to reboot at once, or just ignore the ctrl-alt-del.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) void ctrl_alt_del(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) static DECLARE_WORK(cad_work, deferred_cad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) if (C_A_D)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) schedule_work(&cad_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) kill_cad_pid(SIGINT, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) static const char reboot_cmd[] = "/sbin/reboot";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) static int run_cmd(const char *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) char **argv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) static char *envp[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) "HOME=/",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) argv = argv_split(GFP_KERNEL, cmd, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) if (argv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) argv_free(argv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) static int __orderly_reboot(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) ret = run_cmd(reboot_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) pr_warn("Failed to start orderly reboot: forcing the issue\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) emergency_sync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) kernel_restart(NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) static int __orderly_poweroff(bool force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) ret = run_cmd(poweroff_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (ret && force) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) pr_warn("Failed to start orderly shutdown: forcing the issue\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * I guess this should try to kick off some daemon to sync and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * poweroff asap. Or not even bother syncing if we're doing an
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) * emergency shutdown?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) emergency_sync();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) kernel_power_off();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) static bool poweroff_force;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static void poweroff_work_func(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) __orderly_poweroff(poweroff_force);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) static DECLARE_WORK(poweroff_work, poweroff_work_func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * orderly_poweroff - Trigger an orderly system poweroff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * @force: force poweroff if command execution fails
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * This may be called from any context to trigger a system shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * If the orderly shutdown fails, it will force an immediate shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) void orderly_poweroff(bool force)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (force) /* do not override the pending "true" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) poweroff_force = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) schedule_work(&poweroff_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) EXPORT_SYMBOL_GPL(orderly_poweroff);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) static void reboot_work_func(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) __orderly_reboot();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) static DECLARE_WORK(reboot_work, reboot_work_func);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) * orderly_reboot - Trigger an orderly system reboot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) * This may be called from any context to trigger a system reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) * If the orderly reboot fails, it will force an immediate reboot.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) void orderly_reboot(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) schedule_work(&reboot_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) EXPORT_SYMBOL_GPL(orderly_reboot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) static int __init reboot_setup(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) enum reboot_mode *mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) * Having anything passed on the command line via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * reboot= will cause us to disable DMI checking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * below.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) reboot_default = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) if (!strncmp(str, "panic_", 6)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) mode = &panic_reboot_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) str += 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) mode = &reboot_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) switch (*str) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) case 'w':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) *mode = REBOOT_WARM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) case 'c':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) *mode = REBOOT_COLD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) case 'h':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) *mode = REBOOT_HARD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) case 's':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) if (isdigit(*(str+1)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) reboot_cpu = simple_strtoul(str+1, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) else if (str[1] == 'm' && str[2] == 'p' &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) isdigit(*(str+3)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) reboot_cpu = simple_strtoul(str+3, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) *mode = REBOOT_SOFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) if (reboot_cpu >= num_possible_cpus()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) pr_err("Ignoring the CPU number in reboot= option. "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) "CPU %d exceeds possible cpu number %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) reboot_cpu, num_possible_cpus());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) reboot_cpu = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) case 'g':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) *mode = REBOOT_GPIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) case 'b':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) case 'a':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) case 'k':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) case 't':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) case 'e':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) case 'p':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) reboot_type = *str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) case 'f':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) reboot_force = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) str = strchr(str, ',');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) if (str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) str++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) __setup("reboot=", reboot_setup);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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