diff options
Diffstat (limited to 'kernel/power/main.c')
| -rw-r--r-- | kernel/power/main.c | 906 |
1 files changed, 415 insertions, 491 deletions
diff --git a/kernel/power/main.c b/kernel/power/main.c index 540b16b6856..8e90f330f13 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -3,33 +3,23 @@ * * Copyright (c) 2003 Patrick Mochel * Copyright (c) 2003 Open Source Development Lab - * + * * This file is released under the GPLv2 * */ -#include <linux/module.h> -#include <linux/suspend.h> +#include <linux/export.h> #include <linux/kobject.h> #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/resume-trace.h> -#include <linux/freezer.h> -#include <linux/vmstat.h> -#include <linux/syscalls.h> -#include <linux/ftrace.h> +#include <linux/workqueue.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> #include "power.h" DEFINE_MUTEX(pm_mutex); -unsigned int pm_flags; -EXPORT_SYMBOL(pm_flags); - #ifdef CONFIG_PM_SLEEP /* Routines for PM-transition notifications */ @@ -50,23 +40,40 @@ EXPORT_SYMBOL_GPL(unregister_pm_notifier); int pm_notifier_call_chain(unsigned long val) { - return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) - == NOTIFY_BAD) ? -EINVAL : 0; + int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL); + + return notifier_to_errno(ret); } -#ifdef CONFIG_PM_DEBUG -int pm_test_level = TEST_NONE; +/* If set, devices may be suspended and resumed asynchronously. */ +int pm_async_enabled = 1; -static int suspend_test(int level) +static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) { - if (pm_test_level == level) { - printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n"); - mdelay(5000); - return 1; - } - return 0; + return sprintf(buf, "%d\n", pm_async_enabled); } +static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + if (val > 1) + return -EINVAL; + + pm_async_enabled = val; + return n; +} + +power_attr(pm_async); + +#ifdef CONFIG_PM_DEBUG +int pm_test_level = TEST_NONE; + static const char * const pm_tests[__TEST_AFTER_LAST] = { [TEST_NONE] = "none", [TEST_CORE] = "core", @@ -109,7 +116,7 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, p = memchr(buf, '\n', n); len = p ? p - buf : n; - mutex_lock(&pm_mutex); + lock_system_sleep(); level = TEST_FIRST; for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) @@ -119,418 +126,391 @@ static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, break; } - mutex_unlock(&pm_mutex); + unlock_system_sleep(); return error ? error : n; } power_attr(pm_test); -#else /* !CONFIG_PM_DEBUG */ -static inline int suspend_test(int level) { return 0; } -#endif /* !CONFIG_PM_DEBUG */ - -#endif /* CONFIG_PM_SLEEP */ - -#ifdef CONFIG_SUSPEND - -#ifdef CONFIG_PM_TEST_SUSPEND - -/* - * We test the system suspend code by setting an RTC wakealarm a short - * time in the future, then suspending. Suspending the devices won't - * normally take long ... some systems only need a few milliseconds. - * - * The time it takes is system-specific though, so when we test this - * during system bootup we allow a LOT of time. - */ -#define TEST_SUSPEND_SECONDS 5 +#endif /* CONFIG_PM_DEBUG */ -static unsigned long suspend_test_start_time; - -static void suspend_test_start(void) +#ifdef CONFIG_DEBUG_FS +static char *suspend_step_name(enum suspend_stat_step step) { - /* 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; + switch (step) { + case SUSPEND_FREEZE: + return "freeze"; + case SUSPEND_PREPARE: + return "prepare"; + case SUSPEND_SUSPEND: + return "suspend"; + case SUSPEND_SUSPEND_NOIRQ: + return "suspend_noirq"; + case SUSPEND_RESUME_NOIRQ: + return "resume_noirq"; + case SUSPEND_RESUME: + return "resume"; + default: + return ""; + } } -static void suspend_test_finish(const char *label) +static int suspend_stats_show(struct seq_file *s, void *unused) { - 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); + int i, index, last_dev, last_errno, last_step; + + last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; + last_dev %= REC_FAILED_NUM; + last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; + last_errno %= REC_FAILED_NUM; + last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; + last_step %= REC_FAILED_NUM; + seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" + "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", + "success", suspend_stats.success, + "fail", suspend_stats.fail, + "failed_freeze", suspend_stats.failed_freeze, + "failed_prepare", suspend_stats.failed_prepare, + "failed_suspend", suspend_stats.failed_suspend, + "failed_suspend_late", + suspend_stats.failed_suspend_late, + "failed_suspend_noirq", + suspend_stats.failed_suspend_noirq, + "failed_resume", suspend_stats.failed_resume, + "failed_resume_early", + suspend_stats.failed_resume_early, + "failed_resume_noirq", + suspend_stats.failed_resume_noirq); + seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", + suspend_stats.failed_devs[last_dev]); + for (i = 1; i < REC_FAILED_NUM; i++) { + index = last_dev + REC_FAILED_NUM - i; + index %= REC_FAILED_NUM; + seq_printf(s, "\t\t\t%-s\n", + suspend_stats.failed_devs[index]); + } + seq_printf(s, " last_failed_errno:\t%-d\n", + suspend_stats.errno[last_errno]); + for (i = 1; i < REC_FAILED_NUM; i++) { + index = last_errno + REC_FAILED_NUM - i; + index %= REC_FAILED_NUM; + seq_printf(s, "\t\t\t%-d\n", + suspend_stats.errno[index]); + } + seq_printf(s, " last_failed_step:\t%-s\n", + suspend_step_name( + suspend_stats.failed_steps[last_step])); + for (i = 1; i < REC_FAILED_NUM; i++) { + index = last_step + REC_FAILED_NUM - i; + index %= REC_FAILED_NUM; + seq_printf(s, "\t\t\t%-s\n", + suspend_step_name( + suspend_stats.failed_steps[index])); + } - /* 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_ON(msec > (TEST_SUSPEND_SECONDS * 1000)); + return 0; } -#else - -static void suspend_test_start(void) +static int suspend_stats_open(struct inode *inode, struct file *file) { + return single_open(file, suspend_stats_show, NULL); } -static void suspend_test_finish(const char *label) +static const struct file_operations suspend_stats_operations = { + .open = suspend_stats_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init pm_debugfs_init(void) { + debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, + NULL, NULL, &suspend_stats_operations); + return 0; } -#endif - -/* This is just an arbitrary number */ -#define FREE_PAGE_NUMBER (100) +late_initcall(pm_debugfs_init); +#endif /* CONFIG_DEBUG_FS */ -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); -} +#endif /* CONFIG_PM_SLEEP */ -/** - * suspend_valid_only_mem - generic memory-only valid callback +#ifdef CONFIG_PM_SLEEP_DEBUG +/* + * pm_print_times: print time taken by devices to suspend and resume. * - * 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. + * show() returns whether printing of suspend and resume times is enabled. + * store() accepts 0 or 1. 0 disables printing and 1 enables it. */ -int suspend_valid_only_mem(suspend_state_t state) +bool pm_print_times_enabled; + +static ssize_t pm_print_times_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) { - return state == PM_SUSPEND_MEM; + return sprintf(buf, "%d\n", pm_print_times_enabled); } -/** - * 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) +static ssize_t pm_print_times_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) { - int error; - unsigned int free_pages; - - if (!suspend_ops || !suspend_ops->enter) - return -EPERM; - - pm_prepare_console(); + unsigned long val; - error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); - if (error) - goto Finish; + if (kstrtoul(buf, 10, &val)) + return -EINVAL; - if (suspend_freeze_processes()) { - error = -EAGAIN; - goto Thaw; - } + if (val > 1) + return -EINVAL; - 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: - suspend_thaw_processes(); - Finish: - pm_notifier_call_chain(PM_POST_SUSPEND); - pm_restore_console(); - return error; + pm_print_times_enabled = !!val; + return n; } -/* default implementation */ -void __attribute__ ((weak)) arch_suspend_disable_irqs(void) -{ - local_irq_disable(); -} +power_attr(pm_print_times); -/* default implementation */ -void __attribute__ ((weak)) arch_suspend_enable_irqs(void) +static inline void pm_print_times_init(void) { - local_irq_enable(); + pm_print_times_enabled = !!initcall_debug; } +#else /* !CONFIG_PP_SLEEP_DEBUG */ +static inline void pm_print_times_init(void) {} +#endif /* CONFIG_PM_SLEEP_DEBUG */ + +struct kobject *power_kobj; /** - * suspend_enter - enter the desired system sleep state. - * @state: state to enter + * state - control system sleep states. + * + * show() returns available sleep state labels, which may be "mem", "standby", + * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a + * description of what they mean. * - * This function should be called after devices have been suspended. + * store() accepts one of those strings, translates it into the proper + * enumerated value, and initiates a suspend transition. */ -static int suspend_enter(suspend_state_t state) +static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) { - int error = 0; - - device_pm_lock(); - arch_suspend_disable_irqs(); - BUG_ON(!irqs_disabled()); - - if ((error = device_power_down(PMSG_SUSPEND))) { - printk(KERN_ERR "PM: Some devices failed to power down\n"); - goto Done; - } + char *s = buf; +#ifdef CONFIG_SUSPEND + suspend_state_t i; - if (!suspend_test(TEST_CORE)) - error = suspend_ops->enter(state); + for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) + if (pm_states[i].state) + s += sprintf(s,"%s ", pm_states[i].label); - device_power_up(PMSG_RESUME); - Done: - arch_suspend_enable_irqs(); - BUG_ON(irqs_disabled()); - device_pm_unlock(); - return error; +#endif + if (hibernation_available()) + s += sprintf(s, "disk "); + if (s != buf) + /* convert the last space to a newline */ + *(s-1) = '\n'; + return (s - buf); } -/** - * 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) +static suspend_state_t decode_state(const char *buf, size_t n) { - int error, ftrace_save; +#ifdef CONFIG_SUSPEND + suspend_state_t state = PM_SUSPEND_MIN; + struct pm_sleep_state *s; +#endif + char *p; + int len; - if (!suspend_ops) - return -ENOSYS; + p = memchr(buf, '\n', n); + len = p ? p - buf : n; - if (suspend_ops->begin) { - error = suspend_ops->begin(state); - if (error) - goto Close; - } - suspend_console(); - ftrace_save = __ftrace_enabled_save(); - suspend_test_start(); - error = device_suspend(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; - - if (suspend_ops->prepare) { - error = suspend_ops->prepare(); - if (error) - goto Resume_devices; - } + /* Check hibernation first. */ + if (len == 4 && !strncmp(buf, "disk", len)) + return PM_SUSPEND_MAX; - if (suspend_test(TEST_PLATFORM)) - goto Finish; - - error = disable_nonboot_cpus(); - if (!error && !suspend_test(TEST_CPUS)) - suspend_enter(state); - - enable_nonboot_cpus(); - Finish: - if (suspend_ops->finish) - suspend_ops->finish(); - Resume_devices: - suspend_test_start(); - device_resume(PMSG_RESUME); - suspend_test_finish("resume devices"); - __ftrace_enabled_restore(ftrace_save); - resume_console(); - Close: - if (suspend_ops->end) - suspend_ops->end(); - return error; +#ifdef CONFIG_SUSPEND + for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) + if (s->state && len == strlen(s->label) + && !strncmp(buf, s->label, len)) + return s->state; +#endif - Recover_platform: - if (suspend_ops->recover) - suspend_ops->recover(); - goto Resume_devices; + return PM_SUSPEND_ON; } -/** - * 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 state_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t n) { - suspend_thaw_processes(); - pm_notifier_call_chain(PM_POST_SUSPEND); - pm_restore_console(); -} - + suspend_state_t state; + int error; + error = pm_autosleep_lock(); + if (error) + return error; + if (pm_autosleep_state() > PM_SUSPEND_ON) { + error = -EBUSY; + goto out; + } -static const char * const pm_states[PM_SUSPEND_MAX] = { - [PM_SUSPEND_STANDBY] = "standby", - [PM_SUSPEND_MEM] = "mem", -}; + state = decode_state(buf, n); + if (state < PM_SUSPEND_MAX) + error = pm_suspend(state); + else if (state == PM_SUSPEND_MAX) + error = hibernate(); + else + error = -EINVAL; -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; + out: + pm_autosleep_unlock(); + return error ? error : n; } +power_attr(state); -/** - * enter_state - Do common work of entering low-power state. - * @state: pm_state structure for state we're entering. +#ifdef CONFIG_PM_SLEEP +/* + * The 'wakeup_count' attribute, along with the functions defined in + * drivers/base/power/wakeup.c, provides a means by which wakeup events can be + * handled in a non-racy way. * - * 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). + * If a wakeup event occurs when the system is in a sleep state, it simply is + * woken up. In turn, if an event that would wake the system up from a sleep + * state occurs when it is undergoing a transition to that sleep state, the + * transition should be aborted. Moreover, if such an event occurs when the + * system is in the working state, an attempt to start a transition to the + * given sleep state should fail during certain period after the detection of + * the event. Using the 'state' attribute alone is not sufficient to satisfy + * these requirements, because a wakeup event may occur exactly when 'state' + * is being written to and may be delivered to user space right before it is + * frozen, so the event will remain only partially processed until the system is + * woken up by another event. In particular, it won't cause the transition to + * a sleep state to be aborted. + * + * This difficulty may be overcome if user space uses 'wakeup_count' before + * writing to 'state'. It first should read from 'wakeup_count' and store + * the read value. Then, after carrying out its own preparations for the system + * transition to a sleep state, it should write the stored value to + * 'wakeup_count'. If that fails, at least one wakeup event has occurred since + * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it + * is allowed to write to 'state', but the transition will be aborted if there + * are any wakeup events detected after 'wakeup_count' was written to. */ -static int enter_state(suspend_state_t state) -{ - int error; - if (!valid_state(state)) - return -ENODEV; +static ssize_t wakeup_count_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + unsigned int val; - if (!mutex_trylock(&pm_mutex)) - return -EBUSY; + return pm_get_wakeup_count(&val, true) ? + sprintf(buf, "%u\n", val) : -EINTR; +} - printk(KERN_INFO "PM: Syncing filesystems ... "); - sys_sync(); - printk("done.\n"); +static ssize_t wakeup_count_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned int val; + int error; - pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); - error = suspend_prepare(); + error = pm_autosleep_lock(); if (error) - goto Unlock; + return error; - if (suspend_test(TEST_FREEZER)) - goto Finish; + if (pm_autosleep_state() > PM_SUSPEND_ON) { + error = -EBUSY; + goto out; + } - pr_debug("PM: Entering %s sleep\n", pm_states[state]); - error = suspend_devices_and_enter(state); + error = -EINVAL; + if (sscanf(buf, "%u", &val) == 1) { + if (pm_save_wakeup_count(val)) + error = n; + else + pm_print_active_wakeup_sources(); + } - Finish: - pr_debug("PM: Finishing wakeup.\n"); - suspend_finish(); - Unlock: - mutex_unlock(&pm_mutex); + out: + pm_autosleep_unlock(); return error; } +power_attr(wakeup_count); -/** - * 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) +#ifdef CONFIG_PM_AUTOSLEEP +static ssize_t autosleep_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) { - if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) - return enter_state(state); - return -EINVAL; -} - -EXPORT_SYMBOL(pm_suspend); + suspend_state_t state = pm_autosleep_state(); -#endif /* CONFIG_SUSPEND */ + if (state == PM_SUSPEND_ON) + return sprintf(buf, "off\n"); -struct kobject *power_kobj; - -/** - * state - control system power state. - * - * show() returns what states are supported, which is hard-coded to - * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and - * 'disk' (Suspend-to-Disk). - * - * 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) -{ - char *s = buf; #ifdef CONFIG_SUSPEND - int i; - - for (i = 0; i < PM_SUSPEND_MAX; i++) { - if (pm_states[i] && valid_state(i)) - s += sprintf(s,"%s ", pm_states[i]); - } + if (state < PM_SUSPEND_MAX) + return sprintf(buf, "%s\n", pm_states[state].state ? + pm_states[state].label : "error"); #endif #ifdef CONFIG_HIBERNATION - s += sprintf(s, "%s\n", "disk"); + return sprintf(buf, "disk\n"); #else - if (s != buf) - /* convert the last space to a newline */ - *(s-1) = '\n'; + return sprintf(buf, "error"); #endif - return (s - buf); } -static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, - const char *buf, size_t n) +static ssize_t autosleep_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) { -#ifdef CONFIG_SUSPEND - suspend_state_t state = PM_SUSPEND_STANDBY; - const char * const *s; -#endif - char *p; - int len; - int error = -EINVAL; + suspend_state_t state = decode_state(buf, n); + int error; - p = memchr(buf, '\n', n); - len = p ? p - buf : n; + if (state == PM_SUSPEND_ON + && strcmp(buf, "off") && strcmp(buf, "off\n")) + return -EINVAL; - /* First, check if we are requested to hibernate */ - if (len == 4 && !strncmp(buf, "disk", len)) { - error = hibernate(); - goto Exit; - } + error = pm_autosleep_set_state(state); + return error ? error : n; +} -#ifdef CONFIG_SUSPEND - for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { - if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) - break; - } - if (state < PM_SUSPEND_MAX && *s) - error = enter_state(state); -#endif +power_attr(autosleep); +#endif /* CONFIG_PM_AUTOSLEEP */ + +#ifdef CONFIG_PM_WAKELOCKS +static ssize_t wake_lock_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return pm_show_wakelocks(buf, true); +} - Exit: +static ssize_t wake_lock_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + int error = pm_wake_lock(buf); return error ? error : n; } -power_attr(state); +power_attr(wake_lock); + +static ssize_t wake_unlock_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return pm_show_wakelocks(buf, false); +} + +static ssize_t wake_unlock_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + int error = pm_wake_unlock(buf); + return error ? error : n; +} + +power_attr(wake_unlock); + +#endif /* CONFIG_PM_WAKELOCKS */ +#endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM_TRACE int pm_trace_enabled; @@ -549,22 +529,85 @@ pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, if (sscanf(buf, "%d", &val) == 1) { pm_trace_enabled = !!val; + if (pm_trace_enabled) { + pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" + "PM: Correct system time has to be restored manually after resume.\n"); + } return n; } return -EINVAL; } power_attr(pm_trace); + +static ssize_t pm_trace_dev_match_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return show_trace_dev_match(buf, PAGE_SIZE); +} + +static ssize_t +pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr, + const char *buf, size_t n) +{ + return -EINVAL; +} + +power_attr(pm_trace_dev_match); + #endif /* CONFIG_PM_TRACE */ +#ifdef CONFIG_FREEZER +static ssize_t pm_freeze_timeout_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sprintf(buf, "%u\n", freeze_timeout_msecs); +} + +static ssize_t pm_freeze_timeout_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t n) +{ + unsigned long val; + + if (kstrtoul(buf, 10, &val)) + return -EINVAL; + + freeze_timeout_msecs = val; + return n; +} + +power_attr(pm_freeze_timeout); + +#endif /* CONFIG_FREEZER*/ + static struct attribute * g[] = { &state_attr.attr, #ifdef CONFIG_PM_TRACE &pm_trace_attr.attr, + &pm_trace_dev_match_attr.attr, #endif -#if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) +#ifdef CONFIG_PM_SLEEP + &pm_async_attr.attr, + &wakeup_count_attr.attr, +#ifdef CONFIG_PM_AUTOSLEEP + &autosleep_attr.attr, +#endif +#ifdef CONFIG_PM_WAKELOCKS + &wake_lock_attr.attr, + &wake_unlock_attr.attr, +#endif +#ifdef CONFIG_PM_DEBUG &pm_test_attr.attr, #endif +#ifdef CONFIG_PM_SLEEP_DEBUG + &pm_print_times_attr.attr, +#endif +#endif +#ifdef CONFIG_FREEZER + &pm_freeze_timeout_attr.attr, +#endif NULL, }; @@ -572,154 +615,35 @@ static struct attribute_group attr_group = { .attrs = g, }; +#ifdef CONFIG_PM_RUNTIME +struct workqueue_struct *pm_wq; +EXPORT_SYMBOL_GPL(pm_wq); + +static int __init pm_start_workqueue(void) +{ + pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); + + return pm_wq ? 0 : -ENOMEM; +} +#else +static inline int pm_start_workqueue(void) { return 0; } +#endif static int __init pm_init(void) { + int error = pm_start_workqueue(); + if (error) + return error; + hibernate_image_size_init(); + hibernate_reserved_size_init(); power_kobj = kobject_create_and_add("power", NULL); if (!power_kobj) return -ENOMEM; - return sysfs_create_group(power_kobj, &attr_group); + error = sysfs_create_group(power_kobj, &attr_group); + if (error) + return error; + pm_print_times_init(); + return pm_autosleep_init(); } 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 */ |