Ejemplo n.º 1
0
int hibernation_snapshot(int platform_mode)
{
	int error;

	/* Free memory before shutting down devices. */
	error = swsusp_shrink_memory();
	if (error)
		return error;

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

	suspend_console();
	error = device_suspend(PMSG_FREEZE);
	if (error)
		goto Recover_platform;

	if (hibernation_test(TEST_DEVICES))
		goto Recover_platform;

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

	error = disable_nonboot_cpus();
	if (!error) {
		if (hibernation_test(TEST_CPUS))
			goto Enable_cpus;

		if (hibernation_testmode(HIBERNATION_TEST))
			goto Enable_cpus;

		error = create_image(platform_mode);
		/* Control returns here after successful restore */
	}
 Enable_cpus:
	enable_nonboot_cpus();
 Finish:
	platform_finish(platform_mode);
 Resume_devices:
	device_resume(in_suspend ?
		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
	resume_console();
 Close:
	platform_end(platform_mode);
	return error;

 Recover_platform:
	platform_recover(platform_mode);
	goto Resume_devices;
}
Ejemplo n.º 2
0
int hibernate(void)
{
	int error;

	mutex_lock(&pm_mutex);
	/* 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;

	error = usermodehelper_disable();
	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 = prepare_processes();
	if (error)
		goto Finish;

	if (hibernation_test(TEST_FREEZER))
		goto Thaw;

	if (hibernation_testmode(HIBERNATION_TESTPROC))
		goto Thaw;

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

	if (in_suspend) {
		unsigned int flags = 0;

		if (hibernation_mode == HIBERNATION_PLATFORM)
			flags |= SF_PLATFORM_MODE;
		pr_debug("PM: writing image.\n");
		error = swsusp_write(flags);
		swsusp_free();
		if (!error)
			power_down();
	} else {
		pr_debug("PM: Image restored successfully.\n");
	}

 Thaw:
	thaw_processes();
 Finish:
	free_basic_memory_bitmaps();
	usermodehelper_enable();
 Exit:
	pm_notifier_call_chain(PM_POST_HIBERNATION);
	pm_restore_console();
	atomic_inc(&snapshot_device_available);
 Unlock:
	mutex_unlock(&pm_mutex);
	return error;
}
Ejemplo n.º 3
0
static int create_image(int platform_mode)
{
	int error;

	error = arch_prepare_suspend();
	if (error)
		return error;

	/* At this point, dpm_suspend_start() has been called, but *not*
	 * dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
	 * Otherwise, drivers for some devices (e.g. interrupt controllers)
	 * become desynchronized with the actual state of the hardware
	 * at resume time, and evil weirdness ensues.
	 */
	error = dpm_suspend_noirq(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)
	    || hibernation_testmode(HIBERNATION_TEST))
		goto Enable_cpus;

	local_irq_disable();

	error = sysdev_suspend(PMSG_FREEZE);
	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_check_wakeup_events())
		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:
	sysdev_resume();
	/* NOTE:  dpm_resume_noirq() is just a resume() for devices
	 * that suspended with irqs off ... no overall powerup.
	 */

 Enable_irqs:
	local_irq_enable();

 Enable_cpus:
	enable_nonboot_cpus();

 Platform_finish:
	platform_finish(platform_mode);

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

	return error;
}
Ejemplo n.º 4
0
/**
 * hibernation_snapshot - Quiesce devices and create a hibernation image.
 * @platform_mode: If set, use platform driver to prepare for the transition.
 *
 * This routine must be called with pm_mutex held.
 */
int hibernation_snapshot(int platform_mode)
{
	pm_message_t msg = PMSG_RECOVER;
	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) ||
		hibernation_testmode(HIBERNATION_TESTPROC)) {

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

	error = dpm_prepare(PMSG_FREEZE);
	if (error) {
		dpm_complete(msg);
		goto Cleanup;
	}

	suspend_console();
	ftrace_stop();
	pm_restrict_gfp_mask();
	error = dpm_suspend(PMSG_FREEZE);
	if (error)
		goto Recover_platform;

	if (hibernation_test(TEST_DEVICES))
		goto Recover_platform;

	error = create_image(platform_mode);
	/*
	 * Control returns here (1) after the image has been created or the
	 * image creation has failed and (2) after a successful restore.
	 */

 Resume_devices:
	/* 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;

 Recover_platform:
	platform_recover(platform_mode);
	goto Resume_devices;

 Cleanup:
	swsusp_free();
	goto Close;
}
Ejemplo n.º 5
0
/**
 * create_image - Create a hibernation image.
 * @platform_mode: Whether or not to use the platform driver.
 *
 * Execute device drivers' .freeze_noirq() callbacks, create a hibernation image
 * and execute the drivers' .thaw_noirq() callbacks.
 *
 * Control reappears in this routine after the subsequent restore.
 */
static int create_image(int platform_mode)
{
	int error;

	error = dpm_suspend_noirq(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)
	    || hibernation_testmode(HIBERNATION_TEST))
		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_noirq(in_suspend ?
		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);

	return error;
}