PM: Separate suspend to RAM functionality from core

Move the suspend to RAM and standby code from kernel/power/main.c
to two separate files, kernel/power/suspend.c containing the basic
functions and kernel/power/suspend_test.c containing the automatic
suspend test facility based on the RTC clock alarm.

There are no changes in functionality related to these modifications.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>

1 files changed, 0 insertions, 503 deletions

diff --git a/kernel/power/main.c b/kernel/power/main.c
index 2a19f34..f710e36 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -8,20 +8,9 @@
  *
  */
 
-#include <linux/module.h>
-#include <linux/suspend.h>
 #include <linux/kobject.h>
 #include <linux/string.h>
-#include <linux/delay.h>
-#include <linux/errno.h>
-#include <linux/kmod.h>
-#include <linux/init.h>
-#include <linux/console.h>
-#include <linux/cpu.h>
 #include <linux/resume-trace.h>
-#include <linux/freezer.h>
-#include <linux/vmstat.h>
-#include <linux/syscalls.h>
 
 #include "power.h"
 
@@ -119,355 +108,6 @@ power_attr(pm_test);
 
 #endif /* CONFIG_PM_SLEEP */
 
-#ifdef CONFIG_SUSPEND
-
-static int suspend_test(int level)
-{
-#ifdef CONFIG_PM_DEBUG
-	if (pm_test_level == level) {
-		printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
-		mdelay(5000);
-		return 1;
-	}
-#endif /* !CONFIG_PM_DEBUG */
-	return 0;
-}
-
-#ifdef CONFIG_PM_TEST_SUSPEND
-
-/*
- * We test the system suspend code by setting an RTC wakealarm a short
- * time in the future, then suspending.  Suspending the devices won't
- * normally take long ... some systems only need a few milliseconds.
- *
- * The time it takes is system-specific though, so when we test this
- * during system bootup we allow a LOT of time.
- */
-#define TEST_SUSPEND_SECONDS	5
-
-static unsigned long suspend_test_start_time;
-
-static void suspend_test_start(void)
-{
-	/* FIXME Use better timebase than "jiffies", ideally a clocksource.
-	 * What we want is a hardware counter that will work correctly even
-	 * during the irqs-are-off stages of the suspend/resume cycle...
-	 */
-	suspend_test_start_time = jiffies;
-}
-
-static void suspend_test_finish(const char *label)
-{
-	long nj = jiffies - suspend_test_start_time;
-	unsigned msec;
-
-	msec = jiffies_to_msecs(abs(nj));
-	pr_info("PM: %s took %d.%03d seconds\n", label,
-			msec / 1000, msec % 1000);
-
-	/* Warning on suspend means the RTC alarm period needs to be
-	 * larger -- the system was sooo slooowwww to suspend that the
-	 * alarm (should have) fired before the system went to sleep!
-	 *
-	 * Warning on either suspend or resume also means the system
-	 * has some performance issues.  The stack dump of a WARN_ON
-	 * is more likely to get the right attention than a printk...
-	 */
-	WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label);
-}
-
-#else
-
-static void suspend_test_start(void)
-{
-}
-
-static void suspend_test_finish(const char *label)
-{
-}
-
-#endif
-
-static struct platform_suspend_ops *suspend_ops;
-
-/**
- *	suspend_set_ops - Set the global suspend method table.
- *	@ops:	Pointer to ops structure.
- */
-
-void suspend_set_ops(struct platform_suspend_ops *ops)
-{
-	mutex_lock(&pm_mutex);
-	suspend_ops = ops;
-	mutex_unlock(&pm_mutex);
-}
-
-/**
- * suspend_valid_only_mem - generic memory-only valid callback
- *
- * Platform drivers that implement mem suspend only and only need
- * to check for that in their .valid callback can use this instead
- * of rolling their own .valid callback.
- */
-int suspend_valid_only_mem(suspend_state_t state)
-{
-	return state == PM_SUSPEND_MEM;
-}
-
-/**
- *	suspend_prepare - Do prep work before entering low-power state.
- *
- *	This is common code that is called for each state that we're entering.
- *	Run suspend notifiers, allocate a console and stop all processes.
- */
-static int suspend_prepare(void)
-{
-	int error;
-
-	if (!suspend_ops || !suspend_ops->enter)
-		return -EPERM;
-
-	pm_prepare_console();
-
-	error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
-	if (error)
-		goto Finish;
-
-	error = usermodehelper_disable();
-	if (error)
-		goto Finish;
-
-	error = suspend_freeze_processes();
-	if (!error)
-		return 0;
-
-	suspend_thaw_processes();
-	usermodehelper_enable();
- Finish:
-	pm_notifier_call_chain(PM_POST_SUSPEND);
-	pm_restore_console();
-	return error;
-}
-
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
-{
-	local_irq_disable();
-}
-
-/* default implementation */
-void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
-{
-	local_irq_enable();
-}
-
-/**
- *	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))
-			error = suspend_ops->enter(state);
-		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;
-}
-
-/**
- *	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);
-	suspend_test_finish("resume devices");
-	resume_console();
- Close:
-	if (suspend_ops->end)
-		suspend_ops->end();
-	return error;
-
- Recover_platform:
-	if (suspend_ops->recover)
-		suspend_ops->recover();
-	goto Resume_devices;
-}
-
-/**
- *	suspend_finish - Do final work before exiting suspend sequence.
- *
- *	Call platform code to clean up, restart processes, and free the 
- *	console that we've allocated. This is not called for suspend-to-disk.
- */
-static void suspend_finish(void)
-{
-	suspend_thaw_processes();
-	usermodehelper_enable();
-	pm_notifier_call_chain(PM_POST_SUSPEND);
-	pm_restore_console();
-}
-
-
-
-
-static const char * const pm_states[PM_SUSPEND_MAX] = {
-	[PM_SUSPEND_STANDBY]	= "standby",
-	[PM_SUSPEND_MEM]	= "mem",
-};
-
-static inline int valid_state(suspend_state_t state)
-{
-	/* All states need lowlevel support and need to be valid
-	 * to the lowlevel implementation, no valid callback
-	 * implies that none are valid. */
-	if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
-		return 0;
-	return 1;
-}
-
-
-/**
- *	enter_state - Do common work of entering low-power state.
- *	@state:		pm_state structure for state we're entering.
- *
- *	Make sure we're the only ones trying to enter a sleep state. Fail
- *	if someone has beat us to it, since we don't want anything weird to
- *	happen when we wake up.
- *	Then, do the setup for suspend, enter the state, and cleaup (after
- *	we've woken up).
- */
-static int enter_state(suspend_state_t state)
-{
-	int error;
-
-	if (!valid_state(state))
-		return -ENODEV;
-
-	if (!mutex_trylock(&pm_mutex))
-		return -EBUSY;
-
-	printk(KERN_INFO "PM: Syncing filesystems ... ");
-	sys_sync();
-	printk("done.\n");
-
-	pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
-	error = suspend_prepare();
-	if (error)
-		goto Unlock;
-
-	if (suspend_test(TEST_FREEZER))
-		goto Finish;
-
-	pr_debug("PM: Entering %s sleep\n", pm_states[state]);
-	error = suspend_devices_and_enter(state);
-
- Finish:
-	pr_debug("PM: Finishing wakeup.\n");
-	suspend_finish();
- Unlock:
-	mutex_unlock(&pm_mutex);
-	return error;
-}
-
-
-/**
- *	pm_suspend - Externally visible function for suspending system.
- *	@state:		Enumerated value of state to enter.
- *
- *	Determine whether or not value is within range, get state 
- *	structure, and enter (above).
- */
-
-int pm_suspend(suspend_state_t state)
-{
-	if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
-		return enter_state(state);
-	return -EINVAL;
-}
-
-EXPORT_SYMBOL(pm_suspend);
-
-#endif /* CONFIG_SUSPEND */
-
 struct kobject *power_kobj;
 
 /**
@@ -480,7 +120,6 @@ struct kobject *power_kobj;
  *	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)
 {
@@ -578,7 +217,6 @@ static struct attribute_group attr_group = {
 	.attrs = g,
 };
 
-
 static int __init pm_init(void)
 {
 	power_kobj = kobject_create_and_add("power", NULL);
@@ -588,144 +226,3 @@ static int __init pm_init(void)
 }
 
 core_initcall(pm_init);
-
-
-#ifdef CONFIG_PM_TEST_SUSPEND
-
-#include <linux/rtc.h>
-
-/*
- * To test system suspend, we need a hands-off mechanism to resume the
- * system.  RTCs wake alarms are a common self-contained mechanism.
- */
-
-static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
-{
-	static char err_readtime[] __initdata =
-		KERN_ERR "PM: can't read %s time, err %d\n";
-	static char err_wakealarm [] __initdata =
-		KERN_ERR "PM: can't set %s wakealarm, err %d\n";
-	static char err_suspend[] __initdata =
-		KERN_ERR "PM: suspend test failed, error %d\n";
-	static char info_test[] __initdata =
-		KERN_INFO "PM: test RTC wakeup from '%s' suspend\n";
-
-	unsigned long		now;
-	struct rtc_wkalrm	alm;
-	int			status;
-
-	/* this may fail if the RTC hasn't been initialized */
-	status = rtc_read_time(rtc, &alm.time);
-	if (status < 0) {
-		printk(err_readtime, dev_name(&rtc->dev), status);
-		return;
-	}
-	rtc_tm_to_time(&alm.time, &now);
-
-	memset(&alm, 0, sizeof alm);
-	rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
-	alm.enabled = true;
-
-	status = rtc_set_alarm(rtc, &alm);
-	if (status < 0) {
-		printk(err_wakealarm, dev_name(&rtc->dev), status);
-		return;
-	}
-
-	if (state == PM_SUSPEND_MEM) {
-		printk(info_test, pm_states[state]);
-		status = pm_suspend(state);
-		if (status == -ENODEV)
-			state = PM_SUSPEND_STANDBY;
-	}
-	if (state == PM_SUSPEND_STANDBY) {
-		printk(info_test, pm_states[state]);
-		status = pm_suspend(state);
-	}
-	if (status < 0)
-		printk(err_suspend, status);
-
-	/* Some platforms can't detect that the alarm triggered the
-	 * wakeup, or (accordingly) disable it after it afterwards.
-	 * It's supposed to give oneshot behavior; cope.
-	 */
-	alm.enabled = false;
-	rtc_set_alarm(rtc, &alm);
-}
-
-static int __init has_wakealarm(struct device *dev, void *name_ptr)
-{
-	struct rtc_device *candidate = to_rtc_device(dev);
-
-	if (!candidate->ops->set_alarm)
-		return 0;
-	if (!device_may_wakeup(candidate->dev.parent))
-		return 0;
-
-	*(const char **)name_ptr = dev_name(dev);
-	return 1;
-}
-
-/*
- * Kernel options like "test_suspend=mem" force suspend/resume sanity tests
- * at startup time.  They're normally disabled, for faster boot and because
- * we can't know which states really work on this particular system.
- */
-static suspend_state_t test_state __initdata = PM_SUSPEND_ON;
-
-static char warn_bad_state[] __initdata =
-	KERN_WARNING "PM: can't test '%s' suspend state\n";
-
-static int __init setup_test_suspend(char *value)
-{
-	unsigned i;
-
-	/* "=mem" ==> "mem" */
-	value++;
-	for (i = 0; i < PM_SUSPEND_MAX; i++) {
-		if (!pm_states[i])
-			continue;
-		if (strcmp(pm_states[i], value) != 0)
-			continue;
-		test_state = (__force suspend_state_t) i;
-		return 0;
-	}
-	printk(warn_bad_state, value);
-	return 0;
-}
-__setup("test_suspend", setup_test_suspend);
-
-static int __init test_suspend(void)
-{
-	static char		warn_no_rtc[] __initdata =
-		KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n";
-
-	char			*pony = NULL;
-	struct rtc_device	*rtc = NULL;
-
-	/* PM is initialized by now; is that state testable? */
-	if (test_state == PM_SUSPEND_ON)
-		goto done;
-	if (!valid_state(test_state)) {
-		printk(warn_bad_state, pm_states[test_state]);
-		goto done;
-	}
-
-	/* RTCs have initialized by now too ... can we use one? */
-	class_find_device(rtc_class, NULL, &pony, has_wakealarm);
-	if (pony)
-		rtc = rtc_class_open(pony);
-	if (!rtc) {
-		printk(warn_no_rtc);
-		goto done;
-	}
-
-	/* go for it */
-	test_wakealarm(rtc, test_state);
-	rtc_class_close(rtc);
-done:
-	return 0;
-}
-late_initcall(test_suspend);
-
-#endif /* CONFIG_PM_TEST_SUSPEND */