![David Brownell](/assets/img/avatar_default.png)
Cope with a quirk of some RTCs (notably ACPI ones) which aren't guaranteed to implement oneshot behavior when they woke the system from sleeep: forcibly disable the alarm, just in case. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
723 lines
16 KiB
C
723 lines
16 KiB
C
/*
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* kernel/power/main.c - PM subsystem core functionality.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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*
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* This file is released under the GPLv2
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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/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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DEFINE_MUTEX(pm_mutex);
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unsigned int pm_flags;
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EXPORT_SYMBOL(pm_flags);
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#ifdef CONFIG_PM_SLEEP
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/* Routines for PM-transition notifications */
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static BLOCKING_NOTIFIER_HEAD(pm_chain_head);
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int register_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(register_pm_notifier);
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int unregister_pm_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&pm_chain_head, nb);
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}
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EXPORT_SYMBOL_GPL(unregister_pm_notifier);
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int pm_notifier_call_chain(unsigned long val)
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{
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return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
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== NOTIFY_BAD) ? -EINVAL : 0;
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}
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#ifdef CONFIG_PM_DEBUG
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int pm_test_level = TEST_NONE;
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static int suspend_test(int level)
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{
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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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return 0;
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}
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static const char * const pm_tests[__TEST_AFTER_LAST] = {
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[TEST_NONE] = "none",
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[TEST_CORE] = "core",
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[TEST_CPUS] = "processors",
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[TEST_PLATFORM] = "platform",
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[TEST_DEVICES] = "devices",
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[TEST_FREEZER] = "freezer",
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};
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static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr,
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char *buf)
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{
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char *s = buf;
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int level;
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for (level = TEST_FIRST; level <= TEST_MAX; level++)
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if (pm_tests[level]) {
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if (level == pm_test_level)
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s += sprintf(s, "[%s] ", pm_tests[level]);
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else
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s += sprintf(s, "%s ", pm_tests[level]);
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}
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if (s != buf)
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/* convert the last space to a newline */
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*(s-1) = '\n';
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return (s - buf);
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}
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static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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const char * const *s;
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int level;
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char *p;
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int len;
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int error = -EINVAL;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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mutex_lock(&pm_mutex);
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level = TEST_FIRST;
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for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++)
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if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) {
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pm_test_level = level;
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error = 0;
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break;
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}
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mutex_unlock(&pm_mutex);
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return error ? error : n;
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}
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power_attr(pm_test);
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#else /* !CONFIG_PM_DEBUG */
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static inline int suspend_test(int level) { return 0; }
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#endif /* !CONFIG_PM_DEBUG */
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_SUSPEND
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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_ON(msec > (TEST_SUSPEND_SECONDS * 1000));
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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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/* This is just an arbitrary number */
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#define FREE_PAGE_NUMBER (100)
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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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unsigned int free_pages;
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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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if (suspend_freeze_processes()) {
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error = -EAGAIN;
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goto Thaw;
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}
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free_pages = global_page_state(NR_FREE_PAGES);
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if (free_pages < FREE_PAGE_NUMBER) {
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pr_debug("PM: free some memory\n");
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shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
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if (nr_free_pages() < FREE_PAGE_NUMBER) {
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error = -ENOMEM;
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printk(KERN_ERR "PM: No enough memory\n");
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}
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}
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if (!error)
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return 0;
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Thaw:
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suspend_thaw_processes();
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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 = 0;
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device_pm_lock();
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arch_suspend_disable_irqs();
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BUG_ON(!irqs_disabled());
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if ((error = device_power_down(PMSG_SUSPEND))) {
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printk(KERN_ERR "PM: Some devices failed to power down\n");
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goto Done;
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}
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if (!suspend_test(TEST_CORE))
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error = suspend_ops->enter(state);
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device_power_up(PMSG_RESUME);
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Done:
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arch_suspend_enable_irqs();
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BUG_ON(irqs_disabled());
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device_pm_unlock();
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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 = device_suspend(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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if (suspend_ops->prepare) {
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error = suspend_ops->prepare();
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if (error)
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goto Resume_devices;
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}
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if (suspend_test(TEST_PLATFORM))
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goto Finish;
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error = disable_nonboot_cpus();
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if (!error && !suspend_test(TEST_CPUS))
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suspend_enter(state);
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enable_nonboot_cpus();
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Finish:
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if (suspend_ops->finish)
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suspend_ops->finish();
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Resume_devices:
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suspend_test_start();
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device_resume(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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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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/**
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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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|
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struct kobject *power_kobj;
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|
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/**
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* state - control system power state.
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*
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* show() returns what states are supported, which is hard-coded to
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* 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and
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* 'disk' (Suspend-to-Disk).
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*
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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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|
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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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char *s = buf;
|
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#ifdef CONFIG_SUSPEND
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int i;
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for (i = 0; i < PM_SUSPEND_MAX; i++) {
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if (pm_states[i] && valid_state(i))
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s += sprintf(s,"%s ", pm_states[i]);
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}
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#endif
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#ifdef CONFIG_HIBERNATION
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s += sprintf(s, "%s\n", "disk");
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#else
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if (s != buf)
|
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/* convert the last space to a newline */
|
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*(s-1) = '\n';
|
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#endif
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return (s - buf);
|
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}
|
|
|
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static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr,
|
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const char *buf, size_t n)
|
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{
|
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#ifdef CONFIG_SUSPEND
|
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suspend_state_t state = PM_SUSPEND_STANDBY;
|
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const char * const *s;
|
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#endif
|
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char *p;
|
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int len;
|
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int error = -EINVAL;
|
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|
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p = memchr(buf, '\n', n);
|
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len = p ? p - buf : n;
|
|
|
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/* First, check if we are requested to hibernate */
|
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if (len == 4 && !strncmp(buf, "disk", len)) {
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error = hibernate();
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goto Exit;
|
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}
|
|
|
|
#ifdef CONFIG_SUSPEND
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for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
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if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
|
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break;
|
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}
|
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if (state < PM_SUSPEND_MAX && *s)
|
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error = enter_state(state);
|
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#endif
|
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|
|
Exit:
|
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return error ? error : n;
|
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}
|
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|
|
power_attr(state);
|
|
|
|
#ifdef CONFIG_PM_TRACE
|
|
int pm_trace_enabled;
|
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|
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static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
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return sprintf(buf, "%d\n", pm_trace_enabled);
|
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}
|
|
|
|
static ssize_t
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pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr,
|
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const char *buf, size_t n)
|
|
{
|
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int val;
|
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|
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if (sscanf(buf, "%d", &val) == 1) {
|
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pm_trace_enabled = !!val;
|
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return n;
|
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}
|
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return -EINVAL;
|
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}
|
|
|
|
power_attr(pm_trace);
|
|
#endif /* CONFIG_PM_TRACE */
|
|
|
|
static struct attribute * g[] = {
|
|
&state_attr.attr,
|
|
#ifdef CONFIG_PM_TRACE
|
|
&pm_trace_attr.attr,
|
|
#endif
|
|
#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG)
|
|
&pm_test_attr.attr,
|
|
#endif
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group attr_group = {
|
|
.attrs = g,
|
|
};
|
|
|
|
|
|
static int __init pm_init(void)
|
|
{
|
|
power_kobj = kobject_create_and_add("power", NULL);
|
|
if (!power_kobj)
|
|
return -ENOMEM;
|
|
return sysfs_create_group(power_kobj, &attr_group);
|
|
}
|
|
|
|
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, rtc->dev.bus_id, 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, rtc->dev.bus_id, 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;
|
|
|
|
*(char **)name_ptr = dev->bus_id;
|
|
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 */
|