X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=kernel%2Fpower%2Fmain.c;h=f710e36930cc33ecceac7f5455de6d86fedbd718;hb=1e0deabd35f210f22c03cc734a0335c07ae71ff3;hp=efc08360e627199374837ed95ea31ebcd0f94a80;hpb=d76e15fb20eeb7632ef38876a884fe3508b2c01d;p=safe%2Fjmp%2Flinux-2.6 diff --git a/kernel/power/main.c b/kernel/power/main.c index efc0836..f710e36 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -8,273 +8,105 @@ * */ -#include -#include #include #include -#include -#include -#include -#include -#include #include -#include -#include -#include #include "power.h" -BLOCKING_NOTIFIER_HEAD(pm_chain_head); - DEFINE_MUTEX(pm_mutex); unsigned int pm_flags; EXPORT_SYMBOL(pm_flags); -#ifdef CONFIG_SUSPEND - -/* This is just an arbitrary number */ -#define FREE_PAGE_NUMBER (100) - -static struct platform_suspend_ops *suspend_ops; - -/** - * suspend_set_ops - Set the global suspend method table. - * @ops: Pointer to ops structure. - */ - -void suspend_set_ops(struct platform_suspend_ops *ops) -{ - mutex_lock(&pm_mutex); - suspend_ops = ops; - mutex_unlock(&pm_mutex); -} - -/** - * suspend_valid_only_mem - generic memory-only valid callback - * - * Platform drivers that implement mem suspend only and only need - * to check for that in their .valid callback can use this instead - * of rolling their own .valid callback. - */ -int suspend_valid_only_mem(suspend_state_t state) -{ - return state == PM_SUSPEND_MEM; -} - -/** - * suspend_prepare - Do prep work before entering low-power state. - * - * This is common code that is called for each state that we're entering. - * Run suspend notifiers, allocate a console and stop all processes. - */ -static int suspend_prepare(void) -{ - int error; - unsigned int free_pages; - - if (!suspend_ops || !suspend_ops->enter) - return -EPERM; +#ifdef CONFIG_PM_SLEEP - error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); - if (error) - goto Finish; +/* Routines for PM-transition notifications */ - pm_prepare_console(); +static BLOCKING_NOTIFIER_HEAD(pm_chain_head); - if (freeze_processes()) { - error = -EAGAIN; - goto Thaw; - } - - free_pages = global_page_state(NR_FREE_PAGES); - if (free_pages < FREE_PAGE_NUMBER) { - pr_debug("PM: free some memory\n"); - shrink_all_memory(FREE_PAGE_NUMBER - free_pages); - if (nr_free_pages() < FREE_PAGE_NUMBER) { - error = -ENOMEM; - printk(KERN_ERR "PM: No enough memory\n"); - } - } - if (!error) - return 0; - - Thaw: - thaw_processes(); - pm_restore_console(); - Finish: - pm_notifier_call_chain(PM_POST_SUSPEND); - return error; -} - -/* default implementation */ -void __attribute__ ((weak)) arch_suspend_disable_irqs(void) +int register_pm_notifier(struct notifier_block *nb) { - local_irq_disable(); + return blocking_notifier_chain_register(&pm_chain_head, nb); } +EXPORT_SYMBOL_GPL(register_pm_notifier); -/* default implementation */ -void __attribute__ ((weak)) arch_suspend_enable_irqs(void) +int unregister_pm_notifier(struct notifier_block *nb) { - local_irq_enable(); + return blocking_notifier_chain_unregister(&pm_chain_head, nb); } +EXPORT_SYMBOL_GPL(unregister_pm_notifier); -/** - * 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 pm_notifier_call_chain(unsigned long val) { - int error = 0; - - arch_suspend_disable_irqs(); - BUG_ON(!irqs_disabled()); - - if ((error = device_power_down(PMSG_SUSPEND))) { - printk(KERN_ERR "Some devices failed to power down\n"); - goto Done; - } - error = suspend_ops->enter(state); - device_power_up(); - Done: - arch_suspend_enable_irqs(); - BUG_ON(irqs_disabled()); - return error; + return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) + == NOTIFY_BAD) ? -EINVAL : 0; } -/** - * 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; +#ifdef CONFIG_PM_DEBUG +int pm_test_level = TEST_NONE; - if (!suspend_ops) - return -ENOSYS; - - if (suspend_ops->set_target) { - error = suspend_ops->set_target(state); - if (error) - return error; - } - suspend_console(); - error = device_suspend(PMSG_SUSPEND); - if (error) { - printk(KERN_ERR "Some devices failed to suspend\n"); - goto Resume_console; - } - if (suspend_ops->prepare) { - error = suspend_ops->prepare(); - if (error) - goto Resume_devices; - } - error = disable_nonboot_cpus(); - if (!error) - suspend_enter(state); - - enable_nonboot_cpus(); - if (suspend_ops->finish) - suspend_ops->finish(); - Resume_devices: - device_resume(); - Resume_console: - resume_console(); - return error; -} +static const char * const pm_tests[__TEST_AFTER_LAST] = { + [TEST_NONE] = "none", + [TEST_CORE] = "core", + [TEST_CPUS] = "processors", + [TEST_PLATFORM] = "platform", + [TEST_DEVICES] = "devices", + [TEST_FREEZER] = "freezer", +}; -/** - * 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) +static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) { - thaw_processes(); - pm_restore_console(); - pm_notifier_call_chain(PM_POST_SUSPEND); -} - - - + char *s = buf; + int level; + + for (level = TEST_FIRST; level <= TEST_MAX; level++) + if (pm_tests[level]) { + if (level == pm_test_level) + s += sprintf(s, "[%s] ", pm_tests[level]); + else + s += sprintf(s, "%s ", pm_tests[level]); + } -static const char * const pm_states[PM_SUSPEND_MAX] = { - [PM_SUSPEND_STANDBY] = "standby", - [PM_SUSPEND_MEM] = "mem", -}; + if (s != buf) + /* convert the last space to a newline */ + *(s-1) = '\n'; -static inline int valid_state(suspend_state_t state) -{ - /* All states need lowlevel support and need to be valid - * to the lowlevel implementation, no valid callback - * implies that none are valid. */ - if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state)) - return 0; - return 1; + return (s - buf); } - -/** - * enter_state - Do common work of entering low-power state. - * @state: pm_state structure for state we're entering. - * - * Make sure we're the only ones trying to enter a sleep state. Fail - * if someone has beat us to it, since we don't want anything weird to - * happen when we wake up. - * Then, do the setup for suspend, enter the state, and cleaup (after - * we've woken up). - */ -static int enter_state(suspend_state_t state) +static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t n) { - int error; - - if (!valid_state(state)) - return -ENODEV; - - if (!mutex_trylock(&pm_mutex)) - return -EBUSY; + const char * const *s; + int level; + char *p; + int len; + int error = -EINVAL; - printk("Syncing filesystems ... "); - sys_sync(); - printk("done.\n"); + p = memchr(buf, '\n', n); + len = p ? p - buf : n; - pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); - if ((error = suspend_prepare())) - goto Unlock; + mutex_lock(&pm_mutex); - pr_debug("PM: Entering %s sleep\n", pm_states[state]); - error = suspend_devices_and_enter(state); + level = TEST_FIRST; + for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) + if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { + pm_test_level = level; + error = 0; + break; + } - 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; + return error ? error : n; } -EXPORT_SYMBOL(pm_suspend); +power_attr(pm_test); +#endif /* CONFIG_PM_DEBUG */ -#endif /* CONFIG_SUSPEND */ +#endif /* CONFIG_PM_SLEEP */ struct kobject *power_kobj; @@ -288,7 +120,6 @@ struct kobject *power_kobj; * store() accepts one of those strings, translates it into the * proper enumerated value, and initiates a suspend transition. */ - static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -369,24 +200,23 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, } 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, }; -#else -static struct attribute * g[] = { - &state_attr.attr, - NULL, -}; -#endif /* CONFIG_PM_TRACE */ static struct attribute_group attr_group = { .attrs = g, }; - static int __init pm_init(void) { power_kobj = kobject_create_and_add("power", NULL);