mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
40247e55ba
Not all the reboot settings from both the kernel command line or sysfs interface are available to all platforms. Filter out reboot_type and reboot_force which are x86 only, and also remove reboot_cpu on kernels without SMP support. This saves some space, and avoid confusing the user with settings which will have no effect. Link: https://lkml.kernel.org/r/20201130173717.198952-3-mcroce@linux.microsoft.com Signed-off-by: Matteo Croce <mcroce@microsoft.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
817 lines
19 KiB
C
817 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/kernel/reboot.c
|
|
*
|
|
* Copyright (C) 2013 Linus Torvalds
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "reboot: " fmt
|
|
|
|
#include <linux/ctype.h>
|
|
#include <linux/export.h>
|
|
#include <linux/kexec.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/kmsg_dump.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/syscore_ops.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
/*
|
|
* this indicates whether you can reboot with ctrl-alt-del: the default is yes
|
|
*/
|
|
|
|
int C_A_D = 1;
|
|
struct pid *cad_pid;
|
|
EXPORT_SYMBOL(cad_pid);
|
|
|
|
#if defined(CONFIG_ARM)
|
|
#define DEFAULT_REBOOT_MODE = REBOOT_HARD
|
|
#else
|
|
#define DEFAULT_REBOOT_MODE
|
|
#endif
|
|
enum reboot_mode reboot_mode DEFAULT_REBOOT_MODE;
|
|
enum reboot_mode panic_reboot_mode = REBOOT_UNDEFINED;
|
|
|
|
/*
|
|
* This variable is used privately to keep track of whether or not
|
|
* reboot_type is still set to its default value (i.e., reboot= hasn't
|
|
* been set on the command line). This is needed so that we can
|
|
* suppress DMI scanning for reboot quirks. Without it, it's
|
|
* impossible to override a faulty reboot quirk without recompiling.
|
|
*/
|
|
int reboot_default = 1;
|
|
int reboot_cpu;
|
|
enum reboot_type reboot_type = BOOT_ACPI;
|
|
int reboot_force;
|
|
|
|
/*
|
|
* If set, this is used for preparing the system to power off.
|
|
*/
|
|
|
|
void (*pm_power_off_prepare)(void);
|
|
EXPORT_SYMBOL_GPL(pm_power_off_prepare);
|
|
|
|
/**
|
|
* emergency_restart - reboot the system
|
|
*
|
|
* Without shutting down any hardware or taking any locks
|
|
* reboot the system. This is called when we know we are in
|
|
* trouble so this is our best effort to reboot. This is
|
|
* safe to call in interrupt context.
|
|
*/
|
|
void emergency_restart(void)
|
|
{
|
|
kmsg_dump(KMSG_DUMP_EMERG);
|
|
machine_emergency_restart();
|
|
}
|
|
EXPORT_SYMBOL_GPL(emergency_restart);
|
|
|
|
void kernel_restart_prepare(char *cmd)
|
|
{
|
|
blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
|
|
system_state = SYSTEM_RESTART;
|
|
usermodehelper_disable();
|
|
device_shutdown();
|
|
}
|
|
|
|
/**
|
|
* register_reboot_notifier - Register function to be called at reboot time
|
|
* @nb: Info about notifier function to be called
|
|
*
|
|
* Registers a function with the list of functions
|
|
* to be called at reboot time.
|
|
*
|
|
* Currently always returns zero, as blocking_notifier_chain_register()
|
|
* always returns zero.
|
|
*/
|
|
int register_reboot_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&reboot_notifier_list, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_reboot_notifier);
|
|
|
|
/**
|
|
* unregister_reboot_notifier - Unregister previously registered reboot notifier
|
|
* @nb: Hook to be unregistered
|
|
*
|
|
* Unregisters a previously registered reboot
|
|
* notifier function.
|
|
*
|
|
* Returns zero on success, or %-ENOENT on failure.
|
|
*/
|
|
int unregister_reboot_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_reboot_notifier);
|
|
|
|
static void devm_unregister_reboot_notifier(struct device *dev, void *res)
|
|
{
|
|
WARN_ON(unregister_reboot_notifier(*(struct notifier_block **)res));
|
|
}
|
|
|
|
int devm_register_reboot_notifier(struct device *dev, struct notifier_block *nb)
|
|
{
|
|
struct notifier_block **rcnb;
|
|
int ret;
|
|
|
|
rcnb = devres_alloc(devm_unregister_reboot_notifier,
|
|
sizeof(*rcnb), GFP_KERNEL);
|
|
if (!rcnb)
|
|
return -ENOMEM;
|
|
|
|
ret = register_reboot_notifier(nb);
|
|
if (!ret) {
|
|
*rcnb = nb;
|
|
devres_add(dev, rcnb);
|
|
} else {
|
|
devres_free(rcnb);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(devm_register_reboot_notifier);
|
|
|
|
/*
|
|
* Notifier list for kernel code which wants to be called
|
|
* to restart the system.
|
|
*/
|
|
static ATOMIC_NOTIFIER_HEAD(restart_handler_list);
|
|
|
|
/**
|
|
* register_restart_handler - Register function to be called to reset
|
|
* the system
|
|
* @nb: Info about handler function to be called
|
|
* @nb->priority: Handler priority. Handlers should follow the
|
|
* following guidelines for setting priorities.
|
|
* 0: Restart handler of last resort,
|
|
* with limited restart capabilities
|
|
* 128: Default restart handler; use if no other
|
|
* restart handler is expected to be available,
|
|
* and/or if restart functionality is
|
|
* sufficient to restart the entire system
|
|
* 255: Highest priority restart handler, will
|
|
* preempt all other restart handlers
|
|
*
|
|
* Registers a function with code to be called to restart the
|
|
* system.
|
|
*
|
|
* Registered functions will be called from machine_restart as last
|
|
* step of the restart sequence (if the architecture specific
|
|
* machine_restart function calls do_kernel_restart - see below
|
|
* for details).
|
|
* Registered functions are expected to restart the system immediately.
|
|
* If more than one function is registered, the restart handler priority
|
|
* selects which function will be called first.
|
|
*
|
|
* Restart handlers are expected to be registered from non-architecture
|
|
* code, typically from drivers. A typical use case would be a system
|
|
* where restart functionality is provided through a watchdog. Multiple
|
|
* restart handlers may exist; for example, one restart handler might
|
|
* restart the entire system, while another only restarts the CPU.
|
|
* In such cases, the restart handler which only restarts part of the
|
|
* hardware is expected to register with low priority to ensure that
|
|
* it only runs if no other means to restart the system is available.
|
|
*
|
|
* Currently always returns zero, as atomic_notifier_chain_register()
|
|
* always returns zero.
|
|
*/
|
|
int register_restart_handler(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_register(&restart_handler_list, nb);
|
|
}
|
|
EXPORT_SYMBOL(register_restart_handler);
|
|
|
|
/**
|
|
* unregister_restart_handler - Unregister previously registered
|
|
* restart handler
|
|
* @nb: Hook to be unregistered
|
|
*
|
|
* Unregisters a previously registered restart handler function.
|
|
*
|
|
* Returns zero on success, or %-ENOENT on failure.
|
|
*/
|
|
int unregister_restart_handler(struct notifier_block *nb)
|
|
{
|
|
return atomic_notifier_chain_unregister(&restart_handler_list, nb);
|
|
}
|
|
EXPORT_SYMBOL(unregister_restart_handler);
|
|
|
|
/**
|
|
* do_kernel_restart - Execute kernel restart handler call chain
|
|
*
|
|
* Calls functions registered with register_restart_handler.
|
|
*
|
|
* Expected to be called from machine_restart as last step of the restart
|
|
* sequence.
|
|
*
|
|
* Restarts the system immediately if a restart handler function has been
|
|
* registered. Otherwise does nothing.
|
|
*/
|
|
void do_kernel_restart(char *cmd)
|
|
{
|
|
atomic_notifier_call_chain(&restart_handler_list, reboot_mode, cmd);
|
|
}
|
|
|
|
void migrate_to_reboot_cpu(void)
|
|
{
|
|
/* The boot cpu is always logical cpu 0 */
|
|
int cpu = reboot_cpu;
|
|
|
|
cpu_hotplug_disable();
|
|
|
|
/* Make certain the cpu I'm about to reboot on is online */
|
|
if (!cpu_online(cpu))
|
|
cpu = cpumask_first(cpu_online_mask);
|
|
|
|
/* Prevent races with other tasks migrating this task */
|
|
current->flags |= PF_NO_SETAFFINITY;
|
|
|
|
/* Make certain I only run on the appropriate processor */
|
|
set_cpus_allowed_ptr(current, cpumask_of(cpu));
|
|
}
|
|
|
|
/**
|
|
* kernel_restart - reboot the system
|
|
* @cmd: pointer to buffer containing command to execute for restart
|
|
* or %NULL
|
|
*
|
|
* Shutdown everything and perform a clean reboot.
|
|
* This is not safe to call in interrupt context.
|
|
*/
|
|
void kernel_restart(char *cmd)
|
|
{
|
|
kernel_restart_prepare(cmd);
|
|
if (pm_power_off_prepare)
|
|
pm_power_off_prepare();
|
|
migrate_to_reboot_cpu();
|
|
syscore_shutdown();
|
|
if (!cmd)
|
|
pr_emerg("Restarting system\n");
|
|
else
|
|
pr_emerg("Restarting system with command '%s'\n", cmd);
|
|
kmsg_dump(KMSG_DUMP_SHUTDOWN);
|
|
machine_restart(cmd);
|
|
}
|
|
EXPORT_SYMBOL_GPL(kernel_restart);
|
|
|
|
static void kernel_shutdown_prepare(enum system_states state)
|
|
{
|
|
blocking_notifier_call_chain(&reboot_notifier_list,
|
|
(state == SYSTEM_HALT) ? SYS_HALT : SYS_POWER_OFF, NULL);
|
|
system_state = state;
|
|
usermodehelper_disable();
|
|
device_shutdown();
|
|
}
|
|
/**
|
|
* kernel_halt - halt the system
|
|
*
|
|
* Shutdown everything and perform a clean system halt.
|
|
*/
|
|
void kernel_halt(void)
|
|
{
|
|
kernel_shutdown_prepare(SYSTEM_HALT);
|
|
migrate_to_reboot_cpu();
|
|
syscore_shutdown();
|
|
pr_emerg("System halted\n");
|
|
kmsg_dump(KMSG_DUMP_SHUTDOWN);
|
|
machine_halt();
|
|
}
|
|
EXPORT_SYMBOL_GPL(kernel_halt);
|
|
|
|
/**
|
|
* kernel_power_off - power_off the system
|
|
*
|
|
* Shutdown everything and perform a clean system power_off.
|
|
*/
|
|
void kernel_power_off(void)
|
|
{
|
|
kernel_shutdown_prepare(SYSTEM_POWER_OFF);
|
|
if (pm_power_off_prepare)
|
|
pm_power_off_prepare();
|
|
migrate_to_reboot_cpu();
|
|
syscore_shutdown();
|
|
pr_emerg("Power down\n");
|
|
kmsg_dump(KMSG_DUMP_SHUTDOWN);
|
|
machine_power_off();
|
|
}
|
|
EXPORT_SYMBOL_GPL(kernel_power_off);
|
|
|
|
DEFINE_MUTEX(system_transition_mutex);
|
|
|
|
/*
|
|
* Reboot system call: for obvious reasons only root may call it,
|
|
* and even root needs to set up some magic numbers in the registers
|
|
* so that some mistake won't make this reboot the whole machine.
|
|
* You can also set the meaning of the ctrl-alt-del-key here.
|
|
*
|
|
* reboot doesn't sync: do that yourself before calling this.
|
|
*/
|
|
SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
|
|
void __user *, arg)
|
|
{
|
|
struct pid_namespace *pid_ns = task_active_pid_ns(current);
|
|
char buffer[256];
|
|
int ret = 0;
|
|
|
|
/* We only trust the superuser with rebooting the system. */
|
|
if (!ns_capable(pid_ns->user_ns, CAP_SYS_BOOT))
|
|
return -EPERM;
|
|
|
|
/* For safety, we require "magic" arguments. */
|
|
if (magic1 != LINUX_REBOOT_MAGIC1 ||
|
|
(magic2 != LINUX_REBOOT_MAGIC2 &&
|
|
magic2 != LINUX_REBOOT_MAGIC2A &&
|
|
magic2 != LINUX_REBOOT_MAGIC2B &&
|
|
magic2 != LINUX_REBOOT_MAGIC2C))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* If pid namespaces are enabled and the current task is in a child
|
|
* pid_namespace, the command is handled by reboot_pid_ns() which will
|
|
* call do_exit().
|
|
*/
|
|
ret = reboot_pid_ns(pid_ns, cmd);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Instead of trying to make the power_off code look like
|
|
* halt when pm_power_off is not set do it the easy way.
|
|
*/
|
|
if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
|
|
cmd = LINUX_REBOOT_CMD_HALT;
|
|
|
|
mutex_lock(&system_transition_mutex);
|
|
switch (cmd) {
|
|
case LINUX_REBOOT_CMD_RESTART:
|
|
kernel_restart(NULL);
|
|
break;
|
|
|
|
case LINUX_REBOOT_CMD_CAD_ON:
|
|
C_A_D = 1;
|
|
break;
|
|
|
|
case LINUX_REBOOT_CMD_CAD_OFF:
|
|
C_A_D = 0;
|
|
break;
|
|
|
|
case LINUX_REBOOT_CMD_HALT:
|
|
kernel_halt();
|
|
do_exit(0);
|
|
panic("cannot halt");
|
|
|
|
case LINUX_REBOOT_CMD_POWER_OFF:
|
|
kernel_power_off();
|
|
do_exit(0);
|
|
break;
|
|
|
|
case LINUX_REBOOT_CMD_RESTART2:
|
|
ret = strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1);
|
|
if (ret < 0) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
buffer[sizeof(buffer) - 1] = '\0';
|
|
|
|
kernel_restart(buffer);
|
|
break;
|
|
|
|
#ifdef CONFIG_KEXEC_CORE
|
|
case LINUX_REBOOT_CMD_KEXEC:
|
|
ret = kernel_kexec();
|
|
break;
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
case LINUX_REBOOT_CMD_SW_SUSPEND:
|
|
ret = hibernate();
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
mutex_unlock(&system_transition_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void deferred_cad(struct work_struct *dummy)
|
|
{
|
|
kernel_restart(NULL);
|
|
}
|
|
|
|
/*
|
|
* This function gets called by ctrl-alt-del - ie the keyboard interrupt.
|
|
* As it's called within an interrupt, it may NOT sync: the only choice
|
|
* is whether to reboot at once, or just ignore the ctrl-alt-del.
|
|
*/
|
|
void ctrl_alt_del(void)
|
|
{
|
|
static DECLARE_WORK(cad_work, deferred_cad);
|
|
|
|
if (C_A_D)
|
|
schedule_work(&cad_work);
|
|
else
|
|
kill_cad_pid(SIGINT, 1);
|
|
}
|
|
|
|
char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
|
|
static const char reboot_cmd[] = "/sbin/reboot";
|
|
|
|
static int run_cmd(const char *cmd)
|
|
{
|
|
char **argv;
|
|
static char *envp[] = {
|
|
"HOME=/",
|
|
"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
|
|
NULL
|
|
};
|
|
int ret;
|
|
argv = argv_split(GFP_KERNEL, cmd, NULL);
|
|
if (argv) {
|
|
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
|
|
argv_free(argv);
|
|
} else {
|
|
ret = -ENOMEM;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __orderly_reboot(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = run_cmd(reboot_cmd);
|
|
|
|
if (ret) {
|
|
pr_warn("Failed to start orderly reboot: forcing the issue\n");
|
|
emergency_sync();
|
|
kernel_restart(NULL);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __orderly_poweroff(bool force)
|
|
{
|
|
int ret;
|
|
|
|
ret = run_cmd(poweroff_cmd);
|
|
|
|
if (ret && force) {
|
|
pr_warn("Failed to start orderly shutdown: forcing the issue\n");
|
|
|
|
/*
|
|
* I guess this should try to kick off some daemon to sync and
|
|
* poweroff asap. Or not even bother syncing if we're doing an
|
|
* emergency shutdown?
|
|
*/
|
|
emergency_sync();
|
|
kernel_power_off();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool poweroff_force;
|
|
|
|
static void poweroff_work_func(struct work_struct *work)
|
|
{
|
|
__orderly_poweroff(poweroff_force);
|
|
}
|
|
|
|
static DECLARE_WORK(poweroff_work, poweroff_work_func);
|
|
|
|
/**
|
|
* orderly_poweroff - Trigger an orderly system poweroff
|
|
* @force: force poweroff if command execution fails
|
|
*
|
|
* This may be called from any context to trigger a system shutdown.
|
|
* If the orderly shutdown fails, it will force an immediate shutdown.
|
|
*/
|
|
void orderly_poweroff(bool force)
|
|
{
|
|
if (force) /* do not override the pending "true" */
|
|
poweroff_force = true;
|
|
schedule_work(&poweroff_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(orderly_poweroff);
|
|
|
|
static void reboot_work_func(struct work_struct *work)
|
|
{
|
|
__orderly_reboot();
|
|
}
|
|
|
|
static DECLARE_WORK(reboot_work, reboot_work_func);
|
|
|
|
/**
|
|
* orderly_reboot - Trigger an orderly system reboot
|
|
*
|
|
* This may be called from any context to trigger a system reboot.
|
|
* If the orderly reboot fails, it will force an immediate reboot.
|
|
*/
|
|
void orderly_reboot(void)
|
|
{
|
|
schedule_work(&reboot_work);
|
|
}
|
|
EXPORT_SYMBOL_GPL(orderly_reboot);
|
|
|
|
static int __init reboot_setup(char *str)
|
|
{
|
|
for (;;) {
|
|
enum reboot_mode *mode;
|
|
|
|
/*
|
|
* Having anything passed on the command line via
|
|
* reboot= will cause us to disable DMI checking
|
|
* below.
|
|
*/
|
|
reboot_default = 0;
|
|
|
|
if (!strncmp(str, "panic_", 6)) {
|
|
mode = &panic_reboot_mode;
|
|
str += 6;
|
|
} else {
|
|
mode = &reboot_mode;
|
|
}
|
|
|
|
switch (*str) {
|
|
case 'w':
|
|
*mode = REBOOT_WARM;
|
|
break;
|
|
|
|
case 'c':
|
|
*mode = REBOOT_COLD;
|
|
break;
|
|
|
|
case 'h':
|
|
*mode = REBOOT_HARD;
|
|
break;
|
|
|
|
case 's':
|
|
/*
|
|
* reboot_cpu is s[mp]#### with #### being the processor
|
|
* to be used for rebooting. Skip 's' or 'smp' prefix.
|
|
*/
|
|
str += str[1] == 'm' && str[2] == 'p' ? 3 : 1;
|
|
|
|
if (isdigit(str[0])) {
|
|
int cpu = simple_strtoul(str, NULL, 0);
|
|
|
|
if (cpu >= num_possible_cpus()) {
|
|
pr_err("Ignoring the CPU number in reboot= option. "
|
|
"CPU %d exceeds possible cpu number %d\n",
|
|
cpu, num_possible_cpus());
|
|
break;
|
|
}
|
|
reboot_cpu = cpu;
|
|
} else
|
|
*mode = REBOOT_SOFT;
|
|
break;
|
|
|
|
case 'g':
|
|
*mode = REBOOT_GPIO;
|
|
break;
|
|
|
|
case 'b':
|
|
case 'a':
|
|
case 'k':
|
|
case 't':
|
|
case 'e':
|
|
case 'p':
|
|
reboot_type = *str;
|
|
break;
|
|
|
|
case 'f':
|
|
reboot_force = 1;
|
|
break;
|
|
}
|
|
|
|
str = strchr(str, ',');
|
|
if (str)
|
|
str++;
|
|
else
|
|
break;
|
|
}
|
|
return 1;
|
|
}
|
|
__setup("reboot=", reboot_setup);
|
|
|
|
#ifdef CONFIG_SYSFS
|
|
|
|
#define REBOOT_COLD_STR "cold"
|
|
#define REBOOT_WARM_STR "warm"
|
|
#define REBOOT_HARD_STR "hard"
|
|
#define REBOOT_SOFT_STR "soft"
|
|
#define REBOOT_GPIO_STR "gpio"
|
|
#define REBOOT_UNDEFINED_STR "undefined"
|
|
|
|
#define BOOT_TRIPLE_STR "triple"
|
|
#define BOOT_KBD_STR "kbd"
|
|
#define BOOT_BIOS_STR "bios"
|
|
#define BOOT_ACPI_STR "acpi"
|
|
#define BOOT_EFI_STR "efi"
|
|
#define BOOT_PCI_STR "pci"
|
|
|
|
static ssize_t mode_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
|
|
{
|
|
const char *val;
|
|
|
|
switch (reboot_mode) {
|
|
case REBOOT_COLD:
|
|
val = REBOOT_COLD_STR;
|
|
break;
|
|
case REBOOT_WARM:
|
|
val = REBOOT_WARM_STR;
|
|
break;
|
|
case REBOOT_HARD:
|
|
val = REBOOT_HARD_STR;
|
|
break;
|
|
case REBOOT_SOFT:
|
|
val = REBOOT_SOFT_STR;
|
|
break;
|
|
case REBOOT_GPIO:
|
|
val = REBOOT_GPIO_STR;
|
|
break;
|
|
default:
|
|
val = REBOOT_UNDEFINED_STR;
|
|
}
|
|
|
|
return sprintf(buf, "%s\n", val);
|
|
}
|
|
static ssize_t mode_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
if (!capable(CAP_SYS_BOOT))
|
|
return -EPERM;
|
|
|
|
if (!strncmp(buf, REBOOT_COLD_STR, strlen(REBOOT_COLD_STR)))
|
|
reboot_mode = REBOOT_COLD;
|
|
else if (!strncmp(buf, REBOOT_WARM_STR, strlen(REBOOT_WARM_STR)))
|
|
reboot_mode = REBOOT_WARM;
|
|
else if (!strncmp(buf, REBOOT_HARD_STR, strlen(REBOOT_HARD_STR)))
|
|
reboot_mode = REBOOT_HARD;
|
|
else if (!strncmp(buf, REBOOT_SOFT_STR, strlen(REBOOT_SOFT_STR)))
|
|
reboot_mode = REBOOT_SOFT;
|
|
else if (!strncmp(buf, REBOOT_GPIO_STR, strlen(REBOOT_GPIO_STR)))
|
|
reboot_mode = REBOOT_GPIO;
|
|
else
|
|
return -EINVAL;
|
|
|
|
reboot_default = 0;
|
|
|
|
return count;
|
|
}
|
|
static struct kobj_attribute reboot_mode_attr = __ATTR_RW(mode);
|
|
|
|
#ifdef CONFIG_X86
|
|
static ssize_t force_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", reboot_force);
|
|
}
|
|
static ssize_t force_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
bool res;
|
|
|
|
if (!capable(CAP_SYS_BOOT))
|
|
return -EPERM;
|
|
|
|
if (kstrtobool(buf, &res))
|
|
return -EINVAL;
|
|
|
|
reboot_default = 0;
|
|
reboot_force = res;
|
|
|
|
return count;
|
|
}
|
|
static struct kobj_attribute reboot_force_attr = __ATTR_RW(force);
|
|
|
|
static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
|
|
{
|
|
const char *val;
|
|
|
|
switch (reboot_type) {
|
|
case BOOT_TRIPLE:
|
|
val = BOOT_TRIPLE_STR;
|
|
break;
|
|
case BOOT_KBD:
|
|
val = BOOT_KBD_STR;
|
|
break;
|
|
case BOOT_BIOS:
|
|
val = BOOT_BIOS_STR;
|
|
break;
|
|
case BOOT_ACPI:
|
|
val = BOOT_ACPI_STR;
|
|
break;
|
|
case BOOT_EFI:
|
|
val = BOOT_EFI_STR;
|
|
break;
|
|
case BOOT_CF9_FORCE:
|
|
val = BOOT_PCI_STR;
|
|
break;
|
|
default:
|
|
val = REBOOT_UNDEFINED_STR;
|
|
}
|
|
|
|
return sprintf(buf, "%s\n", val);
|
|
}
|
|
static ssize_t type_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
if (!capable(CAP_SYS_BOOT))
|
|
return -EPERM;
|
|
|
|
if (!strncmp(buf, BOOT_TRIPLE_STR, strlen(BOOT_TRIPLE_STR)))
|
|
reboot_type = BOOT_TRIPLE;
|
|
else if (!strncmp(buf, BOOT_KBD_STR, strlen(BOOT_KBD_STR)))
|
|
reboot_type = BOOT_KBD;
|
|
else if (!strncmp(buf, BOOT_BIOS_STR, strlen(BOOT_BIOS_STR)))
|
|
reboot_type = BOOT_BIOS;
|
|
else if (!strncmp(buf, BOOT_ACPI_STR, strlen(BOOT_ACPI_STR)))
|
|
reboot_type = BOOT_ACPI;
|
|
else if (!strncmp(buf, BOOT_EFI_STR, strlen(BOOT_EFI_STR)))
|
|
reboot_type = BOOT_EFI;
|
|
else if (!strncmp(buf, BOOT_PCI_STR, strlen(BOOT_PCI_STR)))
|
|
reboot_type = BOOT_CF9_FORCE;
|
|
else
|
|
return -EINVAL;
|
|
|
|
reboot_default = 0;
|
|
|
|
return count;
|
|
}
|
|
static struct kobj_attribute reboot_type_attr = __ATTR_RW(type);
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
static ssize_t cpu_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", reboot_cpu);
|
|
}
|
|
static ssize_t cpu_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
unsigned int cpunum;
|
|
int rc;
|
|
|
|
if (!capable(CAP_SYS_BOOT))
|
|
return -EPERM;
|
|
|
|
rc = kstrtouint(buf, 0, &cpunum);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (cpunum >= num_possible_cpus())
|
|
return -ERANGE;
|
|
|
|
reboot_default = 0;
|
|
reboot_cpu = cpunum;
|
|
|
|
return count;
|
|
}
|
|
static struct kobj_attribute reboot_cpu_attr = __ATTR_RW(cpu);
|
|
#endif
|
|
|
|
static struct attribute *reboot_attrs[] = {
|
|
&reboot_mode_attr.attr,
|
|
#ifdef CONFIG_X86
|
|
&reboot_force_attr.attr,
|
|
&reboot_type_attr.attr,
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
&reboot_cpu_attr.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group reboot_attr_group = {
|
|
.attrs = reboot_attrs,
|
|
};
|
|
|
|
static int __init reboot_ksysfs_init(void)
|
|
{
|
|
struct kobject *reboot_kobj;
|
|
int ret;
|
|
|
|
reboot_kobj = kobject_create_and_add("reboot", kernel_kobj);
|
|
if (!reboot_kobj)
|
|
return -ENOMEM;
|
|
|
|
ret = sysfs_create_group(reboot_kobj, &reboot_attr_group);
|
|
if (ret) {
|
|
kobject_put(reboot_kobj);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
late_initcall(reboot_ksysfs_init);
|
|
|
|
#endif
|