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>
This commit is contained in:
Rafael J. Wysocki
parent
783ea7d4ee
commit
a9d7052363
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@ -6,6 +6,8 @@ endif
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obj-$(CONFIG_PM) += main.o
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obj-$(CONFIG_PM_SLEEP) += console.o
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obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_SUSPEND) += suspend.o
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obj-$(CONFIG_PM_TEST_SUSPEND) += suspend_test.o
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obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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@ -8,20 +8,9 @@
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*
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*/
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#include <linux/module.h>
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#include <linux/suspend.h>
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#include <linux/kobject.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/kmod.h>
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#include <linux/init.h>
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#include <linux/console.h>
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#include <linux/cpu.h>
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#include <linux/resume-trace.h>
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#include <linux/freezer.h>
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#include <linux/vmstat.h>
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#include <linux/syscalls.h>
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#include "power.h"
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@ -119,355 +108,6 @@ power_attr(pm_test);
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_SUSPEND
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static int suspend_test(int level)
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{
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#ifdef CONFIG_PM_DEBUG
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if (pm_test_level == level) {
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printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n");
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mdelay(5000);
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return 1;
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}
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#endif /* !CONFIG_PM_DEBUG */
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return 0;
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}
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#ifdef CONFIG_PM_TEST_SUSPEND
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/*
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* We test the system suspend code by setting an RTC wakealarm a short
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* time in the future, then suspending. Suspending the devices won't
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* normally take long ... some systems only need a few milliseconds.
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*
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* The time it takes is system-specific though, so when we test this
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* during system bootup we allow a LOT of time.
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*/
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#define TEST_SUSPEND_SECONDS 5
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static unsigned long suspend_test_start_time;
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static void suspend_test_start(void)
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{
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/* FIXME Use better timebase than "jiffies", ideally a clocksource.
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* What we want is a hardware counter that will work correctly even
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* during the irqs-are-off stages of the suspend/resume cycle...
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*/
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suspend_test_start_time = jiffies;
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}
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static void suspend_test_finish(const char *label)
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{
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long nj = jiffies - suspend_test_start_time;
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unsigned msec;
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msec = jiffies_to_msecs(abs(nj));
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pr_info("PM: %s took %d.%03d seconds\n", label,
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msec / 1000, msec % 1000);
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/* Warning on suspend means the RTC alarm period needs to be
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* larger -- the system was sooo slooowwww to suspend that the
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* alarm (should have) fired before the system went to sleep!
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*
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* Warning on either suspend or resume also means the system
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* has some performance issues. The stack dump of a WARN_ON
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* is more likely to get the right attention than a printk...
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*/
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WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label);
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}
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#else
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static void suspend_test_start(void)
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{
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}
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static void suspend_test_finish(const char *label)
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{
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}
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#endif
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static struct platform_suspend_ops *suspend_ops;
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/**
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* suspend_set_ops - Set the global suspend method table.
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* @ops: Pointer to ops structure.
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*/
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void suspend_set_ops(struct platform_suspend_ops *ops)
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{
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mutex_lock(&pm_mutex);
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suspend_ops = ops;
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mutex_unlock(&pm_mutex);
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}
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/**
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* suspend_valid_only_mem - generic memory-only valid callback
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*
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* Platform drivers that implement mem suspend only and only need
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* to check for that in their .valid callback can use this instead
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* of rolling their own .valid callback.
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*/
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int suspend_valid_only_mem(suspend_state_t state)
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{
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return state == PM_SUSPEND_MEM;
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}
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/**
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* suspend_prepare - Do prep work before entering low-power state.
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*
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* This is common code that is called for each state that we're entering.
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* Run suspend notifiers, allocate a console and stop all processes.
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*/
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static int suspend_prepare(void)
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{
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int error;
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if (!suspend_ops || !suspend_ops->enter)
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return -EPERM;
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pm_prepare_console();
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error = pm_notifier_call_chain(PM_SUSPEND_PREPARE);
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if (error)
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goto Finish;
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error = usermodehelper_disable();
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if (error)
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goto Finish;
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error = suspend_freeze_processes();
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if (!error)
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return 0;
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suspend_thaw_processes();
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usermodehelper_enable();
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Finish:
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pm_notifier_call_chain(PM_POST_SUSPEND);
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pm_restore_console();
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return error;
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}
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/* default implementation */
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void __attribute__ ((weak)) arch_suspend_disable_irqs(void)
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{
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local_irq_disable();
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}
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/* default implementation */
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void __attribute__ ((weak)) arch_suspend_enable_irqs(void)
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{
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local_irq_enable();
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}
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/**
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* suspend_enter - enter the desired system sleep state.
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* @state: state to enter
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*
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* This function should be called after devices have been suspended.
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*/
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static int suspend_enter(suspend_state_t state)
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{
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int error;
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if (suspend_ops->prepare) {
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error = suspend_ops->prepare();
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if (error)
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return error;
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}
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error = dpm_suspend_noirq(PMSG_SUSPEND);
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if (error) {
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printk(KERN_ERR "PM: Some devices failed to power down\n");
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goto Platfrom_finish;
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}
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if (suspend_ops->prepare_late) {
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error = suspend_ops->prepare_late();
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if (error)
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goto Power_up_devices;
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}
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if (suspend_test(TEST_PLATFORM))
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goto Platform_wake;
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error = disable_nonboot_cpus();
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if (error || suspend_test(TEST_CPUS))
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goto Enable_cpus;
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arch_suspend_disable_irqs();
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BUG_ON(!irqs_disabled());
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error = sysdev_suspend(PMSG_SUSPEND);
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if (!error) {
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if (!suspend_test(TEST_CORE))
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error = suspend_ops->enter(state);
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sysdev_resume();
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}
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arch_suspend_enable_irqs();
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BUG_ON(irqs_disabled());
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Enable_cpus:
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enable_nonboot_cpus();
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Platform_wake:
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if (suspend_ops->wake)
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suspend_ops->wake();
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Power_up_devices:
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dpm_resume_noirq(PMSG_RESUME);
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Platfrom_finish:
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if (suspend_ops->finish)
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suspend_ops->finish();
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return error;
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}
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/**
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* suspend_devices_and_enter - suspend devices and enter the desired system
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* sleep state.
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* @state: state to enter
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*/
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int suspend_devices_and_enter(suspend_state_t state)
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{
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int error;
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if (!suspend_ops)
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return -ENOSYS;
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if (suspend_ops->begin) {
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error = suspend_ops->begin(state);
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if (error)
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goto Close;
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}
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suspend_console();
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suspend_test_start();
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error = dpm_suspend_start(PMSG_SUSPEND);
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if (error) {
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printk(KERN_ERR "PM: Some devices failed to suspend\n");
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goto Recover_platform;
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}
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suspend_test_finish("suspend devices");
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if (suspend_test(TEST_DEVICES))
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goto Recover_platform;
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suspend_enter(state);
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Resume_devices:
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suspend_test_start();
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dpm_resume_end(PMSG_RESUME);
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suspend_test_finish("resume devices");
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resume_console();
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Close:
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if (suspend_ops->end)
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suspend_ops->end();
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return error;
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Recover_platform:
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if (suspend_ops->recover)
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suspend_ops->recover();
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goto Resume_devices;
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}
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/**
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* suspend_finish - Do final work before exiting suspend sequence.
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*
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* Call platform code to clean up, restart processes, and free the
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* console that we've allocated. This is not called for suspend-to-disk.
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*/
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static void suspend_finish(void)
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{
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suspend_thaw_processes();
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usermodehelper_enable();
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pm_notifier_call_chain(PM_POST_SUSPEND);
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pm_restore_console();
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}
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static const char * const pm_states[PM_SUSPEND_MAX] = {
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[PM_SUSPEND_STANDBY] = "standby",
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[PM_SUSPEND_MEM] = "mem",
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};
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static inline int valid_state(suspend_state_t state)
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{
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/* All states need lowlevel support and need to be valid
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* to the lowlevel implementation, no valid callback
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* implies that none are valid. */
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if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state))
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return 0;
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return 1;
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}
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/**
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* enter_state - Do common work of entering low-power state.
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* @state: pm_state structure for state we're entering.
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*
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* Make sure we're the only ones trying to enter a sleep state. Fail
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* if someone has beat us to it, since we don't want anything weird to
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* happen when we wake up.
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* Then, do the setup for suspend, enter the state, and cleaup (after
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* we've woken up).
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*/
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static int enter_state(suspend_state_t state)
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{
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int error;
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if (!valid_state(state))
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return -ENODEV;
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if (!mutex_trylock(&pm_mutex))
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return -EBUSY;
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printk(KERN_INFO "PM: Syncing filesystems ... ");
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sys_sync();
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printk("done.\n");
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pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
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error = suspend_prepare();
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if (error)
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goto Unlock;
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if (suspend_test(TEST_FREEZER))
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goto Finish;
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pr_debug("PM: Entering %s sleep\n", pm_states[state]);
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error = suspend_devices_and_enter(state);
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Finish:
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pr_debug("PM: Finishing wakeup.\n");
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suspend_finish();
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Unlock:
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mutex_unlock(&pm_mutex);
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return error;
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}
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/**
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* pm_suspend - Externally visible function for suspending system.
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* @state: Enumerated value of state to enter.
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*
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* Determine whether or not value is within range, get state
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* structure, and enter (above).
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*/
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int pm_suspend(suspend_state_t state)
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{
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if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
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return enter_state(state);
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return -EINVAL;
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}
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EXPORT_SYMBOL(pm_suspend);
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#endif /* CONFIG_SUSPEND */
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struct kobject *power_kobj;
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/**
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@ -480,7 +120,6 @@ struct kobject *power_kobj;
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* store() accepts one of those strings, translates it into the
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* proper enumerated value, and initiates a suspend transition.
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*/
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static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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@ -578,7 +217,6 @@ static struct attribute_group attr_group = {
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.attrs = g,
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};
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static int __init pm_init(void)
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{
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power_kobj = kobject_create_and_add("power", NULL);
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@ -588,144 +226,3 @@ static int __init pm_init(void)
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}
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core_initcall(pm_init);
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#ifdef CONFIG_PM_TEST_SUSPEND
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#include <linux/rtc.h>
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/*
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* To test system suspend, we need a hands-off mechanism to resume the
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* system. RTCs wake alarms are a common self-contained mechanism.
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*/
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static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state)
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{
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static char err_readtime[] __initdata =
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KERN_ERR "PM: can't read %s time, err %d\n";
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static char err_wakealarm [] __initdata =
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KERN_ERR "PM: can't set %s wakealarm, err %d\n";
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static char err_suspend[] __initdata =
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KERN_ERR "PM: suspend test failed, error %d\n";
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static char info_test[] __initdata =
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KERN_INFO "PM: test RTC wakeup from '%s' suspend\n";
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unsigned long now;
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struct rtc_wkalrm alm;
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int status;
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/* this may fail if the RTC hasn't been initialized */
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status = rtc_read_time(rtc, &alm.time);
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if (status < 0) {
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printk(err_readtime, dev_name(&rtc->dev), status);
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return;
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}
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rtc_tm_to_time(&alm.time, &now);
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memset(&alm, 0, sizeof alm);
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rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
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alm.enabled = true;
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status = rtc_set_alarm(rtc, &alm);
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if (status < 0) {
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printk(err_wakealarm, dev_name(&rtc->dev), status);
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return;
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}
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if (state == PM_SUSPEND_MEM) {
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printk(info_test, pm_states[state]);
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status = pm_suspend(state);
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if (status == -ENODEV)
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state = PM_SUSPEND_STANDBY;
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}
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if (state == PM_SUSPEND_STANDBY) {
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printk(info_test, pm_states[state]);
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status = pm_suspend(state);
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}
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if (status < 0)
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printk(err_suspend, status);
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|
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/* Some platforms can't detect that the alarm triggered the
|
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* wakeup, or (accordingly) disable it after it afterwards.
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* It's supposed to give oneshot behavior; cope.
|
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*/
|
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alm.enabled = false;
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rtc_set_alarm(rtc, &alm);
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}
|
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static int __init has_wakealarm(struct device *dev, void *name_ptr)
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{
|
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struct rtc_device *candidate = to_rtc_device(dev);
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|
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if (!candidate->ops->set_alarm)
|
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return 0;
|
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if (!device_may_wakeup(candidate->dev.parent))
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return 0;
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|
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*(const char **)name_ptr = dev_name(dev);
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return 1;
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}
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|
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/*
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* Kernel options like "test_suspend=mem" force suspend/resume sanity tests
|
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* at startup time. They're normally disabled, for faster boot and because
|
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* we can't know which states really work on this particular system.
|
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*/
|
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static suspend_state_t test_state __initdata = PM_SUSPEND_ON;
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|
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static char warn_bad_state[] __initdata =
|
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KERN_WARNING "PM: can't test '%s' suspend state\n";
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|
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static int __init setup_test_suspend(char *value)
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{
|
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unsigned i;
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|
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/* "=mem" ==> "mem" */
|
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value++;
|
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for (i = 0; i < PM_SUSPEND_MAX; i++) {
|
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if (!pm_states[i])
|
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continue;
|
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if (strcmp(pm_states[i], value) != 0)
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continue;
|
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test_state = (__force suspend_state_t) i;
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return 0;
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}
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printk(warn_bad_state, value);
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return 0;
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}
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__setup("test_suspend", setup_test_suspend);
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|
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static int __init test_suspend(void)
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||||
{
|
||||
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 */
|
||||
|
|
|
|||
|
|
@ -160,15 +160,30 @@ extern void swsusp_show_speed(struct timeval *, struct timeval *,
|
|||
unsigned int, char *);
|
||||
|
||||
#ifdef CONFIG_SUSPEND
|
||||
/* kernel/power/main.c */
|
||||
/* kernel/power/suspend.c */
|
||||
extern const char *const pm_states[];
|
||||
|
||||
extern bool valid_state(suspend_state_t state);
|
||||
extern int suspend_devices_and_enter(suspend_state_t state);
|
||||
extern int enter_state(suspend_state_t state);
|
||||
#else /* !CONFIG_SUSPEND */
|
||||
static inline int suspend_devices_and_enter(suspend_state_t state)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
|
||||
static inline bool valid_state(suspend_state_t state) { return false; }
|
||||
#endif /* !CONFIG_SUSPEND */
|
||||
|
||||
#ifdef CONFIG_PM_TEST_SUSPEND
|
||||
/* kernel/power/suspend_test.c */
|
||||
extern void suspend_test_start(void);
|
||||
extern void suspend_test_finish(const char *label);
|
||||
#else /* !CONFIG_PM_TEST_SUSPEND */
|
||||
static inline void suspend_test_start(void) {}
|
||||
static inline void suspend_test_finish(const char *label) {}
|
||||
#endif /* !CONFIG_PM_TEST_SUSPEND */
|
||||
|
||||
#ifdef CONFIG_PM_SLEEP
|
||||
/* kernel/power/main.c */
|
||||
extern int pm_notifier_call_chain(unsigned long val);
|
||||
|
|
|
|||
|
|
@ -0,0 +1,300 @@
|
|||
/*
|
||||
* kernel/power/suspend.c - Suspend to RAM and standby functionality.
|
||||
*
|
||||
* Copyright (c) 2003 Patrick Mochel
|
||||
* Copyright (c) 2003 Open Source Development Lab
|
||||
* Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
|
||||
*
|
||||
* This file is released under the GPLv2.
|
||||
*/
|
||||
|
||||
#include <linux/string.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/console.h>
|
||||
#include <linux/cpu.h>
|
||||
#include <linux/syscalls.h>
|
||||
|
||||
#include "power.h"
|
||||
|
||||
const char *const pm_states[PM_SUSPEND_MAX] = {
|
||||
[PM_SUSPEND_STANDBY] = "standby",
|
||||
[PM_SUSPEND_MEM] = "mem",
|
||||
};
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
bool 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.
|
||||
*/
|
||||
return suspend_ops && suspend_ops->valid && suspend_ops->valid(state);
|
||||
}
|
||||
|
||||
/**
|
||||
* 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;
|
||||
}
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/**
|
||||
* 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();
|
||||
}
|
||||
|
||||
/**
|
||||
* 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).
|
||||
*/
|
||||
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);
|
||||
|
|
@ -0,0 +1,187 @@
|
|||
/*
|
||||
* kernel/power/suspend_test.c - Suspend to RAM and standby test facility.
|
||||
*
|
||||
* Copyright (c) 2009 Pavel Machek <pavel@ucw.cz>
|
||||
*
|
||||
* This file is released under the GPLv2.
|
||||
*/
|
||||
|
||||
#include <linux/init.h>
|
||||
#include <linux/rtc.h>
|
||||
|
||||
#include "power.h"
|
||||
|
||||
/*
|
||||
* 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;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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);
|
||||
Reference in New Issue