C++ dpm_suspend_start函数代码示例

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (need_suspend_ops(state) && !suspend_ops)
		return -ENOSYS;

	if (need_suspend_ops(state) && suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	} else if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) {
		error = freeze_ops->begin();
		if (error)
			goto Close;
	}
	suspend_console();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		pr_err("PM: Some devices failed to suspend, or early wake event detected\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup && need_suspend_ops(state)
		&& suspend_ops->suspend_again && suspend_ops->suspend_again());

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_test_finish("resume devices");
	resume_console();
 Close:
	if (need_suspend_ops(state) && suspend_ops->end)
		suspend_ops->end();
	else if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end)
		freeze_ops->end();

	return error;

 Recover_platform:
	if (need_suspend_ops(state) && suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (!suspend_ops)
		return -ENOSYS;

	trace_machine_suspend(state);
	if (suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	suspend_console();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup
		&& suspend_ops->suspend_again && suspend_ops->suspend_again());

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
#ifdef CONFIG_ZTE_PLATFORM_RECORD_APP_AWAKE_SUSPEND_TIME
	pr_info("Resume DONE \n");	//LHX_PM_20110113 add log to indicate resume finish
	record_sleep_awake_time(false);		//LHX_PM_20110324_01 add code to record how long the APP sleeps or keeps awake 
#endif
	suspend_test_finish("resume devices");
	resume_console();
 Close:
	if (suspend_ops->end)
		suspend_ops->end();
	trace_machine_suspend(PWR_EVENT_EXIT);
	return error;

 Recover_platform:
	if (suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (need_suspend_ops(state) && !suspend_ops)
		return -ENOSYS;

	trace_machine_suspend(state);
	if (need_suspend_ops(state) && suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	if (!suspend_console_deferred)
		suspend_console();
	ftrace_stop();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup && need_suspend_ops(state)
		&& suspend_ops->suspend_again && suspend_ops->suspend_again());

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_test_finish("resume devices");
	ftrace_start();
	if (!suspend_console_deferred)
		resume_console();
 Close:
	if (need_suspend_ops(state) && suspend_ops->end)
		suspend_ops->end();
	trace_machine_suspend(PWR_EVENT_EXIT);
	return error;

 Recover_platform:
	if (need_suspend_ops(state) && suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

int hibernation_restore(int platform_mode)
{
	int error;

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

/**
 *	suspend_devices_and_enter - suspend devices and enter the desired system
 *				    sleep state.
 *	@state:		  state to enter
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;

	if (!suspend_ops)
		return -ENOSYS;

	if (suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	/*
	suspend_console();
	*/
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	suspend_enter(state);

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
#ifdef CONFIG_WMT_SPITS2_SUPPORT	
	/*Disable TS interrupt*/
	wmt_ts_pre_suspend(PMSG_SUSPEND);
#endif
	suspend_test_finish("resume devices");
	resume_console();
	printk("WMT wake up event %x\n",WMT_WAKE_UP_EVENT);
	WMT_WAKE_UP_EVENT = 0;
 Close:
	if (suspend_ops->end)
		suspend_ops->end();
	return error;

 Recover_platform:
	if (suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

int hibernation_snapshot(int platform_mode)
{
	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;

	suspend_console();
	pm_restrict_gfp_mask();
	error = dpm_suspend_start(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();

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

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

	resume_console();
 Close:
	platform_end(platform_mode);
	return error;

 Recover_platform:
	platform_recover(platform_mode);
	goto Resume_devices;
}

/**
 *	suspend_devices_and_enter - suspend devices and enter the desired system
 *				    sleep state.
 *	@state:		  state to enter
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;

	if (!suspend_ops)
		return -ENOSYS;

	trace_machine_suspend(state);
	if (suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	suspend_console();
	suspend_test_start();
	suspend_expire_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_expire_finish("suspend devices");
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	suspend_enter(state);

 Resume_devices:
	suspend_test_start();
	suspend_expire_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_expire_finish("resume devices");
	suspend_test_finish("resume devices");
	resume_console();
 Close:
	if (suspend_ops->end)
		suspend_ops->end();
	trace_machine_suspend(PWR_EVENT_EXIT);
	return error;

 Recover_platform:
	if (suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

/**
 * suspend_devices_and_enter - Suspend devices and enter system sleep state.
 * @state: System sleep state to enter.
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;
	bool wakeup = false;

	if (!sleep_state_supported(state))
		return -ENOSYS;

	pm_suspend_target_state = state;

	error = platform_suspend_begin(state);
	if (error)
		goto Close;

	suspend_console();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		pr_err("Some devices failed to suspend, or early wake event detected\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	do {
		error = suspend_enter(state, &wakeup);
	} while (!error && !wakeup && platform_suspend_again(state));

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	suspend_test_finish("resume devices");
	trace_suspend_resume(TPS("resume_console"), state, true);
	resume_console();
	trace_suspend_resume(TPS("resume_console"), state, false);

 Close:
	platform_resume_end(state);
	pm_suspend_target_state = PM_SUSPEND_ON;
	return error;

 Recover_platform:
	platform_recover(state);
	goto Resume_devices;
}

/**
 *	suspend_devices_and_enter - suspend devices and enter the desired system
 *				    sleep state.
 *	@state:		  state to enter
 */
int suspend_devices_and_enter(suspend_state_t state)
{
	int error;

	if (!suspend_ops)
		return -ENOSYS;

	if (suspend_ops->begin) {
		error = suspend_ops->begin(state);
		if (error)
			goto Close;
	}
	suspend_console();
	pm_restrict_gfp_mask();
	suspend_test_start();
	error = dpm_suspend_start(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to suspend\n");
		goto Recover_platform;
	}
	suspend_test_finish("suspend devices");
	if (suspend_test(TEST_DEVICES))
		goto Recover_platform;

	suspend_enter(state);

 Resume_devices:
	suspend_test_start();
	dpm_resume_end(PMSG_RESUME);
	ktime_resume_endtime=ktime_get();
	printk(KERN_ERR "<POWER>resume6[peripheral resume]take %llu ns\n",ktime_to_ns(ktime_sub(ktime_resume_endtime, ktime_resume_fromtime)));
	ktime_resume_fromtime=ktime_resume_endtime;
	suspend_test_finish("resume devices");
	pm_restore_gfp_mask();
	resume_console();
 Close:
	if (suspend_ops->end)
		suspend_ops->end();
	return error;

 Recover_platform:
	if (suspend_ops->recover)
		suspend_ops->recover();
	goto Resume_devices;
}

int hibernation_restore(int platform_mode)
{
	int error;
	gfp_t saved_mask;

	pm_prepare_console();
	suspend_console();
	saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
	error = dpm_suspend_start(PMSG_QUIESCE);
	if (!error) {
		error = resume_target_kernel(platform_mode);
		dpm_resume_end(PMSG_RECOVER);
	}
	set_gfp_allowed_mask(saved_mask);
	resume_console();
	pm_restore_console();
	return error;
}

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;
}

int hibernation_snapshot(int platform_mode)
{
	int error;
	gfp_t saved_mask;

	error = platform_begin(platform_mode);
	if (error)
		return error;

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

	suspend_console();
	saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
	error = dpm_suspend_start(PMSG_FREEZE);
	if (error)
		goto Recover_platform;

	if (hibernation_test(TEST_DEVICES))
		goto Recover_platform;

	error = create_image(platform_mode);
	/* Control returns here after successful restore */

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

	dpm_resume_end(in_suspend ?
		(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
	set_gfp_allowed_mask(saved_mask);
	resume_console();
 Close:
	platform_end(platform_mode);
	return error;

 Recover_platform:
	platform_recover(platform_mode);
	goto Resume_devices;
}

/**
 * hibernation_restore - Quiesce devices and restore from a hibernation image.
 * @platform_mode: If set, use platform driver to prepare for the transition.
 *
 * This routine must be called with pm_mutex held.  If it is successful, control
 * reappears in the restored target kernel in hibernation_snapshot().
 */
int hibernation_restore(int platform_mode)
{
	int error;

	pm_prepare_console();
	suspend_console();
	pm_restrict_gfp_mask();
	error = dpm_suspend_start(PMSG_QUIESCE);
	if (!error) {
		error = resume_target_kernel(platform_mode);
		/*
		 * The above should either succeed and jump to the new kernel,
		 * or return with an error. Otherwise things are just
		 * undefined, so let's be paranoid.
		 */
		BUG_ON(!error);
	}
	dpm_resume_end(PMSG_RECOVER);
	pm_restore_gfp_mask();
	resume_console();
	pm_restore_console();
	return error;
}

int hibernation_snapshot(int platform_mode)
{
	int error;

	error = platform_begin(platform_mode);
	if (error)
		return error;

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

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

	if (hibernation_test(TEST_DEVICES))
		goto Recover_platform;

	error = create_image(platform_mode);
	/* Control returns here after successful restore */

 Resume_devices:
	dpm_resume_end(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;
}

static void do_suspend(void)
{
	int err;
	struct suspend_info si;

	shutting_down = SHUTDOWN_SUSPEND;

#ifdef CONFIG_PREEMPT
	/* If the kernel is preemptible, we need to freeze all the processes
	   to prevent them from being in the middle of a pagetable update
	   during suspend. */
	err = freeze_processes();
	if (err) {
		printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
		goto out;
	}
#endif

	err = dpm_suspend_start(PMSG_FREEZE);
	if (err) {
		printk(KERN_ERR "xen suspend: dpm_suspend_start %d\n", err);
		goto out_thaw;
	}

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

	err = dpm_suspend_noirq(PMSG_FREEZE);
	if (err) {
		printk(KERN_ERR "dpm_suspend_noirq failed: %d\n", err);
		goto out_resume;
	}

	si.cancelled = 1;

	if (xen_hvm_domain()) {
		si.arg = 0UL;
		si.pre = NULL;
		si.post = &xen_hvm_post_suspend;
	} else {
		si.arg = virt_to_mfn(xen_start_info);
		si.pre = &xen_pre_suspend;
		si.post = &xen_post_suspend;
	}

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

	dpm_resume_noirq(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

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

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

	dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);

	/* Make sure timer events get retriggered on all CPUs */
	clock_was_set();

out_thaw:
#ifdef CONFIG_PREEMPT
	thaw_processes();
out:
#endif
	shutting_down = SHUTDOWN_INVALID;
}