static bool suspend_again(bool *drivers_resumed)
{
	const struct list_head *irqs;
	struct list_head unfinished;

	*drivers_resumed = false;

	/* If a platform suspend_again handler is defined, when it decides to
	 * not suspend again, this takes precedence over drivers.  If a
	 * platform's suspend_again callback returns true, then we proceed to
	 * check the drivers as well.
	 */
	if (suspend_ops->suspend_again && !suspend_ops->suspend_again())
		return false;

	/* TODO: resume only the drivers associated with the wakeup interrupts!
	 */
	dpm_resume_end(PMSG_RESUME);
	*drivers_resumed = true;

	/* Thaw kernel threads opportunistically, to allow get_wakeup_reasons
	 * to block while the wakeup interrupt list is being assembled.  Calls
	 * schedule() internally.
	 */
	thaw_kernel_threads();

	/* Look for a match between the wakeup reasons and the registered
	 * callbacks.  Don't bother thawing the kernel threads if a match is
	 * not found.
         */
	irqs = get_wakeup_reasons(msecs_to_jiffies(100), &unfinished);
	if (!suspend_again_match(irqs, &unfinished))
		return false;

	if (suspend_again_consensus() &&
		       !freeze_kernel_threads()) {
		clear_wakeup_reasons();
		dpm_suspend_start(PMSG_SUSPEND);
		*drivers_resumed = false;
		return true;
	}

	return false;
}
Example #2
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;
	int error;

	pm_suspend_clear_flags();
	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();
	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();

	resume_console();
	dpm_complete(msg);

 Close:
	platform_end(platform_mode);
	return error;

 Thaw:
	thaw_kernel_threads();
 Cleanup:
	swsusp_free();
	goto Close;
}
Example #3
0
File: manage.c Project: mdamt/linux
static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

	err = freeze_processes();
	if (err) {
		pr_err("%s: freeze processes failed %d\n", __func__, err);
		goto out;
	}

	err = freeze_kernel_threads();
	if (err) {
		pr_err("%s: freeze kernel threads failed %d\n", __func__, err);
		goto out_thaw;
	}

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		pr_err("%s: dpm_suspend_start %d\n", __func__, err);
		goto out_thaw;
	}

	printk(KERN_DEBUG "suspending xenstore...\n");
	xs_suspend();

	err = dpm_suspend_end(PMSG_FREEZE);
	if (err) {
		pr_err("dpm_suspend_end failed: %d\n", err);
		si.cancelled = 0;
		goto out_resume;
	}

	xen_arch_suspend();

	si.cancelled = 1;

	err = stop_machine(xen_suspend, &si, cpumask_of(0));

	/* Resume console as early as possible. */
	if (!si.cancelled)
		xen_console_resume();

	raw_notifier_call_chain(&xen_resume_notifier, 0, NULL);

	dpm_resume_start(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	if (err) {
		pr_err("failed to start xen_suspend: %d\n", err);
		si.cancelled = 1;
	}

	xen_arch_resume();

out_resume:
	if (!si.cancelled)
		xs_resume();
	else
		xs_suspend_cancel();

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

out_thaw:
	thaw_processes();
out:
	shutting_down = SHUTDOWN_INVALID;
}
Example #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 Close;

	error = dpm_prepare(PMSG_FREEZE);
	if (error)
		goto Complete_devices;

	suspend_console();
	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();

	resume_console();

 Complete_devices:
	dpm_complete(msg);

 Close:
	platform_end(platform_mode);
	return error;

 Recover_platform:
	platform_recover(platform_mode);
	goto Resume_devices;
}