Пример #1
0
/**
 *	suspend_enter - enter the desired system sleep state.
 *	@state:		state to enter
 *
 *	This function should be called after devices have been suspended.
 */
static int suspend_enter(suspend_state_t state)
{
	int error;

	if (suspend_ops->prepare) {
		error = suspend_ops->prepare();
		if (error)
			return error;
	}

	error = dpm_suspend_noirq(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to power down\n");
		goto Platfrom_finish;
	}

	if (suspend_ops->prepare_late) {
		error = suspend_ops->prepare_late();
		if (error)
			goto Power_up_devices;
	}

	if (suspend_test(TEST_PLATFORM))
		goto Platform_wake;

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

	arch_suspend_disable_irqs();
	BUG_ON(!irqs_disabled());

	error = sysdev_suspend(PMSG_SUSPEND);
	if (!error) {
		if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
			error = suspend_ops->enter(state);
			events_check_enabled = false;
		}
		sysdev_resume();
	}

	arch_suspend_enable_irqs();
	BUG_ON(irqs_disabled());

 Enable_cpus:
	enable_nonboot_cpus();

 Platform_wake:
	if (suspend_ops->wake)
		suspend_ops->wake();

 Power_up_devices:
	dpm_resume_noirq(PMSG_RESUME);

 Platfrom_finish:
	if (suspend_ops->finish)
		suspend_ops->finish();

	return error;
}
Пример #2
0
int hibernation_platform_enter(void)
{
	int error;
	gfp_t saved_mask;

	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();
	saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
	error = dpm_suspend_start(PMSG_HIBERNATE);
	if (error) {
		if (hibernation_ops->recover)
			hibernation_ops->recover();
		goto Resume_devices;
	}

	error = dpm_suspend_noirq(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();
	sysdev_suspend(PMSG_HIBERNATE);
	if (!pm_check_wakeup_events()) {
		error = -EAGAIN;
		goto Power_up;
	}

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

 Power_up:
	sysdev_resume();
	local_irq_enable();
	enable_nonboot_cpus();

 Platform_finish:
	hibernation_ops->finish();

	dpm_suspend_noirq(PMSG_RESTORE);

 Resume_devices:
	entering_platform_hibernation = false;
	dpm_resume_end(PMSG_RESTORE);
	set_gfp_allowed_mask(saved_mask);
	resume_console();

 Close:
	hibernation_ops->end();

	return error;
}
Пример #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;
}
Пример #4
0
static int try_to_freeze_tasks(bool sig_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;
	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (frozen(p) || !freezeable(p))
				continue;

			if (!freeze_task(p, sig_only))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's
			 * scheduler lock after setting TIF_FREEZE, it's
			 * guaranteed that either we see TASK_RUNNING or
			 * try_to_stop() after schedule() in ptrace/signal
			 * stop sees TIF_FREEZE.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (!todo || time_after(jiffies, end_time))
			break;

		if (!pm_check_wakeup_events()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		msleep(10);
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					sig_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
			printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
					"(%d tasks refusing to freeze):\n",
					wakeup ? "aborted" : "failed",
					elapsed_csecs / 100, elapsed_csecs % 100, todo);
		}
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			task_lock(p);
			if (!wakeup && freezing(p) && !freezer_should_skip(p))
				sched_show_task(p);
			cancel_freezing(p);
			task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
Пример #5
0
/**
 *	suspend_enter - enter the desired system sleep state.
 *	@state:		state to enter
 *
 *	This function should be called after devices have been suspended.
 */
static int suspend_enter(suspend_state_t state)
{
	int error;

	if (suspend_ops->prepare) {
		error = suspend_ops->prepare();
		if (error)
			goto Platform_finish;
	}

	error = dpm_suspend_noirq(PMSG_SUSPEND);
	if (error) {
		printk(KERN_ERR "PM: Some devices failed to power down\n");
		goto Platform_finish;
	}

	if (suspend_ops->prepare_late) {
		error = suspend_ops->prepare_late();
		if (error)
			goto Platform_wake;
	}

	if (suspend_test(TEST_PLATFORM))
		goto Platform_wake;

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

	arch_suspend_disable_irqs();
	BUG_ON(!irqs_disabled());

	error = sysdev_suspend(PMSG_SUSPEND);
	
	if (!error) {
		if (!suspend_test(TEST_CORE) && pm_check_wakeup_events()) {
			error = suspend_ops->enter(state);
			rtc_resume_fromtime=tegra_rtc_read_ms();
			events_check_enabled = false;
		}
		sysdev_resume();
	}

	arch_suspend_enable_irqs();
	BUG_ON(irqs_disabled());

 Enable_cpus:
	enable_nonboot_cpus();

	rtc_resume_endtime=tegra_rtc_read_ms();		
	printk(KERN_ERR "<POWER>resume2[Enable CPU]take %llu ms\n",rtc_resume_endtime-rtc_resume_fromtime);
	rtc_resume_fromtime=rtc_resume_endtime;
	
 Platform_wake:
	if (suspend_ops->wake)
		suspend_ops->wake();
	rtc_resume_endtime=tegra_rtc_read_ms();		
	printk(KERN_ERR "<POWER>resume3[CPU suspend_ops->wake]take %llu ms\n",rtc_resume_endtime-rtc_resume_fromtime);

	ktime_resume_fromtime=ktime_get();
	dpm_resume_noirq(PMSG_RESUME);
	ktime_resume_endtime=ktime_get();
	printk(KERN_ERR "<POWER>resume4[CPU resume_noirq]take %llu ns\n",ktime_to_ns(ktime_sub(ktime_resume_endtime, ktime_resume_fromtime)));
	ktime_resume_fromtime=ktime_resume_endtime;

 Platform_finish:
	if (suspend_ops->finish)
		suspend_ops->finish();
	ktime_resume_endtime=ktime_get();
	printk(KERN_ERR "<POWER>resume5[CPU suspend_ops->finish]take %llu ns\n",ktime_to_ns(ktime_sub(ktime_resume_endtime, ktime_resume_fromtime)));
	ktime_resume_fromtime=ktime_resume_endtime;

	return error;
}