hibernate.c

Go to the documentation of this file.

/*
 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
 *
 * Copyright (c) 2003 Patrick Mochel
 * Copyright (c) 2003 Open Source Development Lab
 * Copyright (c) 2004 Pavel Machek <[email protected]>
 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
 * Copyright (C) 2012 Bojan Smojver <[email protected]>
 *
 * This file is released under the GPLv2.
 */

#include <linux/export.h>
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
#include <linux/device.h>
#include <linux/async.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/pm.h>
#include <linux/console.h>
#include <linux/cpu.h>
#include <linux/freezer.h>
#include <linux/gfp.h>
#include <linux/syscore_ops.h>
#include <linux/ctype.h>
#include <linux/genhd.h>

#include "power.h"


static int nocompress;
static int noresume;
static int resume_wait;
static int resume_delay;
static char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
sector_t swsusp_resume_block;
int in_suspend __nosavedata;

enum {
    HIBERNATION_INVALID,
    HIBERNATION_PLATFORM,
    HIBERNATION_SHUTDOWN,
    HIBERNATION_REBOOT,
#ifdef CONFIG_SUSPEND
    HIBERNATION_SUSPEND,
#endif
    /* keep last */
    __HIBERNATION_AFTER_LAST
};
#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)

static int hibernation_mode = HIBERNATION_SHUTDOWN;

bool freezer_test_done;

static const struct platform_hibernation_ops *hibernation_ops;

void hibernation_set_ops(const struct platform_hibernation_ops *ops)
{
    if (ops && !(ops->begin && ops->end &&  ops->pre_snapshot
        && ops->prepare && ops->finish && ops->enter && ops->pre_restore
        && ops->restore_cleanup && ops->leave)) {
        WARN_ON(1);
        return;
    }
    lock_system_sleep();
    hibernation_ops = ops;
    if (ops)
        hibernation_mode = HIBERNATION_PLATFORM;
    else if (hibernation_mode == HIBERNATION_PLATFORM)
        hibernation_mode = HIBERNATION_SHUTDOWN;

    unlock_system_sleep();
}

static bool entering_platform_hibernation;

bool system_entering_hibernation(void)
{
    return entering_platform_hibernation;
}
EXPORT_SYMBOL(system_entering_hibernation);

#ifdef CONFIG_PM_DEBUG
static void hibernation_debug_sleep(void)
{
    printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
    mdelay(5000);
}

static int hibernation_test(int level)
{
    if (pm_test_level == level) {
        hibernation_debug_sleep();
        return 1;
    }
    return 0;
}
#else /* !CONFIG_PM_DEBUG */
static int hibernation_test(int level) { return 0; }
#endif /* !CONFIG_PM_DEBUG */

static int platform_begin(int platform_mode)
{
    return (platform_mode && hibernation_ops) ?
        hibernation_ops->begin() : 0;
}

static void platform_end(int platform_mode)
{
    if (platform_mode && hibernation_ops)
        hibernation_ops->end();
}

static int platform_pre_snapshot(int platform_mode)
{
    return (platform_mode && hibernation_ops) ?
        hibernation_ops->pre_snapshot() : 0;
}

static void platform_leave(int platform_mode)
{
    if (platform_mode && hibernation_ops)
        hibernation_ops->leave();
}

static void platform_finish(int platform_mode)
{
    if (platform_mode && hibernation_ops)
        hibernation_ops->finish();
}

static int platform_pre_restore(int platform_mode)
{
    return (platform_mode && hibernation_ops) ?
        hibernation_ops->pre_restore() : 0;
}

static void platform_restore_cleanup(int platform_mode)
{
    if (platform_mode && hibernation_ops)
        hibernation_ops->restore_cleanup();
}

static void platform_recover(int platform_mode)
{
    if (platform_mode && hibernation_ops && hibernation_ops->recover)
        hibernation_ops->recover();
}

void swsusp_show_speed(struct timeval *start, struct timeval *stop,
            unsigned nr_pages, char *msg)
{
    s64 elapsed_centisecs64;
    int centisecs;
    int k;
    int kps;

    elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
    do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
    centisecs = elapsed_centisecs64;
    if (centisecs == 0)
        centisecs = 1;  /* avoid div-by-zero */
    k = nr_pages * (PAGE_SIZE / 1024);
    kps = (k * 100) / centisecs;
    printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
            msg, k,
            centisecs / 100, centisecs % 100,
            kps / 1000, (kps % 1000) / 10);
}

static int create_image(int platform_mode)
{
    int error;

    error = dpm_suspend_end(PMSG_FREEZE);
    if (error) {
        printk(KERN_ERR "PM: Some devices failed to power down, "
            "aborting hibernation\n");
        return error;
    }

    error = platform_pre_snapshot(platform_mode);
    if (error || hibernation_test(TEST_PLATFORM))
        goto Platform_finish;

    error = disable_nonboot_cpus();
    if (error || hibernation_test(TEST_CPUS))
        goto Enable_cpus;

    local_irq_disable();

    error = syscore_suspend();
    if (error) {
        printk(KERN_ERR "PM: Some system devices failed to power down, "
            "aborting hibernation\n");
        goto Enable_irqs;
    }

    if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
        goto Power_up;

    in_suspend = 1;
    save_processor_state();
    error = swsusp_arch_suspend();
    if (error)
        printk(KERN_ERR "PM: Error %d creating hibernation image\n",
            error);
    /* Restore control flow magically appears here */
    restore_processor_state();
    if (!in_suspend) {
        events_check_enabled = false;
        platform_leave(platform_mode);
    }

 Power_up:
    syscore_resume();

 Enable_irqs:
    local_irq_enable();

 Enable_cpus:
    enable_nonboot_cpus();

 Platform_finish:
    platform_finish(platform_mode);

    dpm_resume_start(in_suspend ?
        (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);

    return error;
}

int hibernation_snapshot(int platform_mode)
{
    pm_message_t msg;
    int error;

    error = platform_begin(platform_mode);
    if (error)
        goto Close;

    /* Preallocate image memory before shutting down devices. */
    error = hibernate_preallocate_memory();
    if (error)
        goto Close;

    error = freeze_kernel_threads();
    if (error)
        goto Cleanup;

    if (hibernation_test(TEST_FREEZER)) {

        /*
         * Indicate to the caller that we are returning due to a
         * successful freezer test.
         */
        freezer_test_done = true;
        goto Thaw;
    }

    error = dpm_prepare(PMSG_FREEZE);
    if (error) {
        dpm_complete(PMSG_RECOVER);
        goto Thaw;
    }

    suspend_console();
    ftrace_stop();
    pm_restrict_gfp_mask();

    error = dpm_suspend(PMSG_FREEZE);

    if (error || hibernation_test(TEST_DEVICES))
        platform_recover(platform_mode);
    else
        error = create_image(platform_mode);

    /*
     * In the case that we call create_image() above, the control
     * returns here (1) after the image has been created or the
     * image creation has failed and (2) after a successful restore.
     */

    /* We may need to release the preallocated image pages here. */
    if (error || !in_suspend)
        swsusp_free();

    msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
    dpm_resume(msg);

    if (error || !in_suspend)
        pm_restore_gfp_mask();

    ftrace_start();
    resume_console();
    dpm_complete(msg);

 Close:
    platform_end(platform_mode);
    return error;

 Thaw:
    thaw_kernel_threads();
 Cleanup:
    swsusp_free();
    goto Close;
}

static int resume_target_kernel(bool platform_mode)
{
    int error;

    error = dpm_suspend_end(PMSG_QUIESCE);
    if (error) {
        printk(KERN_ERR "PM: Some devices failed to power down, "
            "aborting resume\n");
        return error;
    }

    error = platform_pre_restore(platform_mode);
    if (error)
        goto Cleanup;

    error = disable_nonboot_cpus();
    if (error)
        goto Enable_cpus;

    local_irq_disable();

    error = syscore_suspend();
    if (error)
        goto Enable_irqs;

    save_processor_state();
    error = restore_highmem();
    if (!error) {
        error = swsusp_arch_resume();
        /*
         * The code below is only ever reached in case of a failure.
         * Otherwise, execution continues at the place where
         * swsusp_arch_suspend() was called.
         */
        BUG_ON(!error);
        /*
         * This call to restore_highmem() reverts the changes made by
         * the previous one.
         */
        restore_highmem();
    }
    /*
     * The only reason why swsusp_arch_resume() can fail is memory being
     * very tight, so we have to free it as soon as we can to avoid
     * subsequent failures.
     */
    swsusp_free();
    restore_processor_state();
    touch_softlockup_watchdog();

    syscore_resume();

 Enable_irqs:
    local_irq_enable();

 Enable_cpus:
    enable_nonboot_cpus();

 Cleanup:
    platform_restore_cleanup(platform_mode);

    dpm_resume_start(PMSG_RECOVER);

    return error;
}

int hibernation_restore(int platform_mode)
{
    int error;

    pm_prepare_console();
    suspend_console();
    ftrace_stop();
    pm_restrict_gfp_mask();
    error = dpm_suspend_start(PMSG_QUIESCE);
    if (!error) {
        error = resume_target_kernel(platform_mode);
        dpm_resume_end(PMSG_RECOVER);
    }
    pm_restore_gfp_mask();
    ftrace_start();
    resume_console();
    pm_restore_console();
    return error;
}

int hibernation_platform_enter(void)
{
    int error;

    if (!hibernation_ops)
        return -ENOSYS;

    /*
     * We have cancelled the power transition by running
     * hibernation_ops->finish() before saving the image, so we should let
     * the firmware know that we're going to enter the sleep state after all
     */
    error = hibernation_ops->begin();
    if (error)
        goto Close;

    entering_platform_hibernation = true;
    suspend_console();
    ftrace_stop();
    error = dpm_suspend_start(PMSG_HIBERNATE);
    if (error) {
        if (hibernation_ops->recover)
            hibernation_ops->recover();
        goto Resume_devices;
    }

    error = dpm_suspend_end(PMSG_HIBERNATE);
    if (error)
        goto Resume_devices;

    error = hibernation_ops->prepare();
    if (error)
        goto Platform_finish;

    error = disable_nonboot_cpus();
    if (error)
        goto Platform_finish;

    local_irq_disable();
    syscore_suspend();
    if (pm_wakeup_pending()) {
        error = -EAGAIN;
        goto Power_up;
    }

    hibernation_ops->enter();
    /* We should never get here */
    while (1);

 Power_up:
    syscore_resume();
    local_irq_enable();
    enable_nonboot_cpus();

 Platform_finish:
    hibernation_ops->finish();

    dpm_resume_start(PMSG_RESTORE);

 Resume_devices:
    entering_platform_hibernation = false;
    dpm_resume_end(PMSG_RESTORE);
    ftrace_start();
    resume_console();

 Close:
    hibernation_ops->end();

    return error;
}

static void power_down(void)
{
#ifdef CONFIG_SUSPEND
    int error;
#endif

    switch (hibernation_mode) {
    case HIBERNATION_REBOOT:
        kernel_restart(NULL);
        break;
    case HIBERNATION_PLATFORM:
        hibernation_platform_enter();
    case HIBERNATION_SHUTDOWN:
        kernel_power_off();
        break;
#ifdef CONFIG_SUSPEND
    case HIBERNATION_SUSPEND:
        error = suspend_devices_and_enter(PM_SUSPEND_MEM);
        if (error) {
            if (hibernation_ops)
                hibernation_mode = HIBERNATION_PLATFORM;
            else
                hibernation_mode = HIBERNATION_SHUTDOWN;
            power_down();
        }
        /*
         * Restore swap signature.
         */
        error = swsusp_unmark();
        if (error)
            printk(KERN_ERR "PM: Swap will be unusable! "
                            "Try swapon -a.\n");
        return;
#endif
    }
    kernel_halt();
    /*
     * Valid image is on the disk, if we continue we risk serious data
     * corruption after resume.
     */
    printk(KERN_CRIT "PM: Please power down manually\n");
    while(1);
}

int hibernate(void)
{
    int error;

    lock_system_sleep();
    /* The snapshot device should not be opened while we're running */
    if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
        error = -EBUSY;
        goto Unlock;
    }

    pm_prepare_console();
    error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
    if (error)
        goto Exit;

    /* Allocate memory management structures */
    error = create_basic_memory_bitmaps();
    if (error)
        goto Exit;

    printk(KERN_INFO "PM: Syncing filesystems ... ");
    sys_sync();
    printk("done.\n");

    error = freeze_processes();
    if (error)
        goto Free_bitmaps;

    error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
    if (error || freezer_test_done)
        goto Thaw;

    if (in_suspend) {
        unsigned int flags = 0;

        if (hibernation_mode == HIBERNATION_PLATFORM)
            flags |= SF_PLATFORM_MODE;
        if (nocompress)
            flags |= SF_NOCOMPRESS_MODE;
        else
                flags |= SF_CRC32_MODE;

        pr_debug("PM: writing image.\n");
        error = swsusp_write(flags);
        swsusp_free();
        if (!error)
            power_down();
        in_suspend = 0;
        pm_restore_gfp_mask();
    } else {
        pr_debug("PM: Image restored successfully.\n");
    }

 Thaw:
    thaw_processes();

    /* Don't bother checking whether freezer_test_done is true */
    freezer_test_done = false;

 Free_bitmaps:
    free_basic_memory_bitmaps();
 Exit:
    pm_notifier_call_chain(PM_POST_HIBERNATION);
    pm_restore_console();
    atomic_inc(&snapshot_device_available);
 Unlock:
    unlock_system_sleep();
    return error;
}


static int software_resume(void)
{
    int error;
    unsigned int flags;

    /*
     * If the user said "noresume".. bail out early.
     */
    if (noresume)
        return 0;

    /*
     * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
     * is configured into the kernel. Since the regular hibernate
     * trigger path is via sysfs which takes a buffer mutex before
     * calling hibernate functions (which take pm_mutex) this can
     * cause lockdep to complain about a possible ABBA deadlock
     * which cannot happen since we're in the boot code here and
     * sysfs can't be invoked yet. Therefore, we use a subclass
     * here to avoid lockdep complaining.
     */
    mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);

    if (swsusp_resume_device)
        goto Check_image;

    if (!strlen(resume_file)) {
        error = -ENOENT;
        goto Unlock;
    }

    pr_debug("PM: Checking hibernation image partition %s\n", resume_file);

    if (resume_delay) {
        printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
            resume_delay);
        ssleep(resume_delay);
    }

    /* Check if the device is there */
    swsusp_resume_device = name_to_dev_t(resume_file);

    /*
     * name_to_dev_t is ineffective to verify parition if resume_file is in
     * integer format. (e.g. major:minor)
     */
    if (isdigit(resume_file[0]) && resume_wait) {
        int partno;
        while (!get_gendisk(swsusp_resume_device, &partno))
            msleep(10);
    }

    if (!swsusp_resume_device) {
        /*
         * Some device discovery might still be in progress; we need
         * to wait for this to finish.
         */
        wait_for_device_probe();

        if (resume_wait) {
            while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
                msleep(10);
            async_synchronize_full();
        }

        swsusp_resume_device = name_to_dev_t(resume_file);
        if (!swsusp_resume_device) {
            error = -ENODEV;
            goto Unlock;
        }
    }

 Check_image:
    pr_debug("PM: Hibernation image partition %d:%d present\n",
        MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));

    pr_debug("PM: Looking for hibernation image.\n");
    error = swsusp_check();
    if (error)
        goto Unlock;

    /* The snapshot device should not be opened while we're running */
    if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
        error = -EBUSY;
        swsusp_close(FMODE_READ);
        goto Unlock;
    }

    pm_prepare_console();
    error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
    if (error)
        goto close_finish;

    error = create_basic_memory_bitmaps();
    if (error)
        goto close_finish;

    pr_debug("PM: Preparing processes for restore.\n");
    error = freeze_processes();
    if (error) {
        swsusp_close(FMODE_READ);
        goto Done;
    }

    pr_debug("PM: Loading hibernation image.\n");

    error = swsusp_read(&flags);
    swsusp_close(FMODE_READ);
    if (!error)
        hibernation_restore(flags & SF_PLATFORM_MODE);

    printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
    swsusp_free();
    thaw_processes();
 Done:
    free_basic_memory_bitmaps();
 Finish:
    pm_notifier_call_chain(PM_POST_RESTORE);
    pm_restore_console();
    atomic_inc(&snapshot_device_available);
    /* For success case, the suspend path will release the lock */
 Unlock:
    mutex_unlock(&pm_mutex);
    pr_debug("PM: Hibernation image not present or could not be loaded.\n");
    return error;
close_finish:
    swsusp_close(FMODE_READ);
    goto Finish;
}

late_initcall(software_resume);


static const char * const hibernation_modes[] = {
    [HIBERNATION_PLATFORM]  = "platform",
    [HIBERNATION_SHUTDOWN]  = "shutdown",
    [HIBERNATION_REBOOT]    = "reboot",
#ifdef CONFIG_SUSPEND
    [HIBERNATION_SUSPEND]   = "suspend",
#endif
};

/*
 * /sys/power/disk - Control hibernation mode.
 *
 * Hibernation can be handled in several ways.  There are a few different ways
 * to put the system into the sleep state: using the platform driver (e.g. ACPI
 * or other hibernation_ops), powering it off or rebooting it (for testing
 * mostly).
 *
 * The sysfs file /sys/power/disk provides an interface for selecting the
 * hibernation mode to use.  Reading from this file causes the available modes
 * to be printed.  There are 3 modes that can be supported:
 *
 *  'platform'
 *  'shutdown'
 *  'reboot'
 *
 * If a platform hibernation driver is in use, 'platform' will be supported
 * and will be used by default.  Otherwise, 'shutdown' will be used by default.
 * The selected option (i.e. the one corresponding to the current value of
 * hibernation_mode) is enclosed by a square bracket.
 *
 * To select a given hibernation mode it is necessary to write the mode's
 * string representation (as returned by reading from /sys/power/disk) back
 * into /sys/power/disk.
 */

static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
             char *buf)
{
    int i;
    char *start = buf;

    for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
        if (!hibernation_modes[i])
            continue;
        switch (i) {
        case HIBERNATION_SHUTDOWN:
        case HIBERNATION_REBOOT:
#ifdef CONFIG_SUSPEND
        case HIBERNATION_SUSPEND:
#endif
            break;
        case HIBERNATION_PLATFORM:
            if (hibernation_ops)
                break;
            /* not a valid mode, continue with loop */
            continue;
        }
        if (i == hibernation_mode)
            buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
        else
            buf += sprintf(buf, "%s ", hibernation_modes[i]);
    }
    buf += sprintf(buf, "\n");
    return buf-start;
}

static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
              const char *buf, size_t n)
{
    int error = 0;
    int i;
    int len;
    char *p;
    int mode = HIBERNATION_INVALID;

    p = memchr(buf, '\n', n);
    len = p ? p - buf : n;

    lock_system_sleep();
    for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
        if (len == strlen(hibernation_modes[i])
            && !strncmp(buf, hibernation_modes[i], len)) {
            mode = i;
            break;
        }
    }
    if (mode != HIBERNATION_INVALID) {
        switch (mode) {
        case HIBERNATION_SHUTDOWN:
        case HIBERNATION_REBOOT:
#ifdef CONFIG_SUSPEND
        case HIBERNATION_SUSPEND:
#endif
            hibernation_mode = mode;
            break;
        case HIBERNATION_PLATFORM:
            if (hibernation_ops)
                hibernation_mode = mode;
            else
                error = -EINVAL;
        }
    } else
        error = -EINVAL;

    if (!error)
        pr_debug("PM: Hibernation mode set to '%s'\n",
             hibernation_modes[mode]);
    unlock_system_sleep();
    return error ? error : n;
}

power_attr(disk);

static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
               char *buf)
{
    return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
               MINOR(swsusp_resume_device));
}

static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
                const char *buf, size_t n)
{
    unsigned int maj, min;
    dev_t res;
    int ret = -EINVAL;

    if (sscanf(buf, "%u:%u", &maj, &min) != 2)
        goto out;

    res = MKDEV(maj,min);
    if (maj != MAJOR(res) || min != MINOR(res))
        goto out;

    lock_system_sleep();
    swsusp_resume_device = res;
    unlock_system_sleep();
    printk(KERN_INFO "PM: Starting manual resume from disk\n");
    noresume = 0;
    software_resume();
    ret = n;
 out:
    return ret;
}

power_attr(resume);

static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
                   char *buf)
{
    return sprintf(buf, "%lu\n", image_size);
}

static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
                const char *buf, size_t n)
{
    unsigned long size;

    if (sscanf(buf, "%lu", &size) == 1) {
        image_size = size;
        return n;
    }

    return -EINVAL;
}

power_attr(image_size);

static ssize_t reserved_size_show(struct kobject *kobj,
                  struct kobj_attribute *attr, char *buf)
{
    return sprintf(buf, "%lu\n", reserved_size);
}

static ssize_t reserved_size_store(struct kobject *kobj,
                   struct kobj_attribute *attr,
                   const char *buf, size_t n)
{
    unsigned long size;

    if (sscanf(buf, "%lu", &size) == 1) {
        reserved_size = size;
        return n;
    }

    return -EINVAL;
}

power_attr(reserved_size);

static struct attribute * g[] = {
    &disk_attr.attr,
    &resume_attr.attr,
    &image_size_attr.attr,
    &reserved_size_attr.attr,
    NULL,
};


static struct attribute_group attr_group = {
    .attrs = g,
};


static int __init pm_disk_init(void)
{
    return sysfs_create_group(power_kobj, &attr_group);
}

core_initcall(pm_disk_init);


static int __init resume_setup(char *str)
{
    if (noresume)
        return 1;

    strncpy( resume_file, str, 255 );
    return 1;
}

static int __init resume_offset_setup(char *str)
{
    unsigned long long offset;

    if (noresume)
        return 1;

    if (sscanf(str, "%llu", &offset) == 1)
        swsusp_resume_block = offset;

    return 1;
}

static int __init hibernate_setup(char *str)
{
    if (!strncmp(str, "noresume", 8))
        noresume = 1;
    else if (!strncmp(str, "nocompress", 10))
        nocompress = 1;
    return 1;
}

static int __init noresume_setup(char *str)
{
    noresume = 1;
    return 1;
}

static int __init resumewait_setup(char *str)
{
    resume_wait = 1;
    return 1;
}

static int __init resumedelay_setup(char *str)
{
    resume_delay = simple_strtoul(str, NULL, 0);
    return 1;
}

__setup("noresume", noresume_setup);
__setup("resume_offset=", resume_offset_setup);
__setup("resume=", resume_setup);
__setup("hibernate=", hibernate_setup);
__setup("resumewait", resumewait_setup);
__setup("resumedelay=", resumedelay_setup);