Example #1
0
static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
			 char *buf)
{
	int i;
	char *start = buf;

	if (!hibernation_available())
		return sprintf(buf, "[disabled]\n");

	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
		case HIBERNATION_TEST_RESUME:
			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;
}
Example #2
0
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;

	if (!hibernation_available())
		return -EPERM;

	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
		case HIBERNATION_TEST_RESUME:
			hibernation_mode = mode;
			break;
		case HIBERNATION_PLATFORM:
			if (hibernation_ops)
				hibernation_mode = mode;
			else
				error = -EINVAL;
		}
	} else
		error = -EINVAL;

	if (!error)
		pr_debug("Hibernation mode set to '%s'\n",
			 hibernation_modes[mode]);
	unlock_system_sleep();
	return error ? error : n;
}
Example #3
0
/**
 * state - control system sleep states.
 *
 * show() returns available sleep state labels, which may be "mem", "standby",
 * "freeze" and "disk" (hibernation).  See Documentation/power/states.txt for a
 * description of what they mean.
 *
 * store() accepts one of those strings, translates it into the proper
 * enumerated value, and initiates a suspend transition.
 */
static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
			  char *buf)
{
	char *s = buf;
#ifdef CONFIG_SUSPEND
	suspend_state_t i;

	for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++)
		if (pm_states[i])
			s += sprintf(s,"%s ", pm_states[i]);

#endif
	if (hibernation_available())
		s += sprintf(s, "disk ");
	if (s != buf)
		/* convert the last space to a newline */
		*(s-1) = '\n';
	return (s - buf);
}
Example #4
0
/**
 * software_resume - Resume from a saved hibernation image.
 *
 * This routine is called as a late initcall, when all devices have been
 * discovered and initialized already.
 *
 * The image reading code is called to see if there is a hibernation image
 * available for reading.  If that is the case, devices are quiesced and the
 * contents of memory is restored from the saved image.
 *
 * If this is successful, control reappears in the restored target kernel in
 * hibernation_snapshot() which returns to hibernate().  Otherwise, the routine
 * attempts to recover gracefully and make the kernel return to the normal mode
 * of operation.
 */
static int software_resume(void)
{
	int error, nr_calls = 0;

	/*
	 * If the user said "noresume".. bail out early.
	 */
	if (noresume || !hibernation_available())
		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("Checking hibernation image partition %s\n", resume_file);

	if (resume_delay) {
		pr_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("Hibernation image partition %d:%d present\n",
		MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));

	pr_debug("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, -1, &nr_calls);
	if (error) {
		nr_calls--;
		goto Close_Finish;
	}

	pr_debug("Preparing processes for restore.\n");
	error = freeze_processes();
	if (error)
		goto Close_Finish;
	error = load_image_and_restore();
	thaw_processes();
 Finish:
	__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
	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("Hibernation image not present or could not be loaded.\n");
	return error;
 Close_Finish:
	swsusp_close(FMODE_READ);
	goto Finish;
}
Example #5
0
/**
 * hibernate - Carry out system hibernation, including saving the image.
 */
int hibernate(void)
{
	int error, nr_calls = 0;
	bool snapshot_test = false;

	if (!hibernation_available()) {
		pr_debug("Hibernation not available.\n");
		return -EPERM;
	}

	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, -1, &nr_calls);
	if (error) {
		nr_calls--;
		goto Exit;
	}

	pr_info("Syncing filesystems ... \n");
	sys_sync();
	pr_info("done.\n");

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

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

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

	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("Writing image.\n");
		error = swsusp_write(flags);
		swsusp_free();
		if (!error) {
			if (hibernation_mode == HIBERNATION_TEST_RESUME)
				snapshot_test = true;
			else
				power_down();
		}
		in_suspend = 0;
		pm_restore_gfp_mask();
	} else {
		pr_debug("Image restored successfully.\n");
	}

 Free_bitmaps:
	free_basic_memory_bitmaps();
 Thaw:
	unlock_device_hotplug();
	if (snapshot_test) {
		pr_debug("Checking hibernation image\n");
		error = swsusp_check();
		if (!error)
			error = load_image_and_restore();
	}
	thaw_processes();

	/* Don't bother checking whether freezer_test_done is true */
	freezer_test_done = false;
 Exit:
	__pm_notifier_call_chain(PM_POST_HIBERNATION, nr_calls, NULL);
	pm_restore_console();
	atomic_inc(&snapshot_device_available);
 Unlock:
	unlock_system_sleep();
	return error;
}
Example #6
0
static int snapshot_open(struct inode *inode, struct file *filp)
{
	struct snapshot_data *data;
	int error, nr_calls = 0;

	if (!hibernation_available())
		return -EPERM;

	lock_system_sleep();

	if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
		error = -EBUSY;
		goto Unlock;
	}

	if ((filp->f_flags & O_ACCMODE) == O_RDWR) {
		atomic_inc(&snapshot_device_available);
		error = -ENOSYS;
		goto Unlock;
	}
	nonseekable_open(inode, filp);
	data = &snapshot_state;
	filp->private_data = data;
	memset(&data->handle, 0, sizeof(struct snapshot_handle));
	if ((filp->f_flags & O_ACCMODE) == O_RDONLY) {
		/* Hibernating.  The image device should be accessible. */
		data->swap = swsusp_resume_device ?
			swap_type_of(swsusp_resume_device, 0, NULL) : -1;
		data->mode = O_RDONLY;
		data->free_bitmaps = false;
		error = __pm_notifier_call_chain(PM_HIBERNATION_PREPARE, -1, &nr_calls);
		if (error)
			__pm_notifier_call_chain(PM_POST_HIBERNATION, --nr_calls, NULL);
	} else {
		/*
		 * Resuming.  We may need to wait for the image device to
		 * appear.
		 */
		wait_for_device_probe();

		data->swap = -1;
		data->mode = O_WRONLY;
		error = __pm_notifier_call_chain(PM_RESTORE_PREPARE, -1, &nr_calls);
		if (!error) {
			error = create_basic_memory_bitmaps();
			data->free_bitmaps = !error;
		} else
			nr_calls--;

		if (error)
			__pm_notifier_call_chain(PM_POST_RESTORE, nr_calls, NULL);
	}
	if (error)
		atomic_inc(&snapshot_device_available);

	data->frozen = false;
	data->ready = false;
	data->platform_support = false;

 Unlock:
	unlock_system_sleep();

	return error;
}