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kernel/power/main.c
22.5 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * kernel/power/main.c - PM subsystem core functionality. * * Copyright (c) 2003 Patrick Mochel * Copyright (c) 2003 Open Source Development Lab |
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*/ |
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#include <linux/export.h> |
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#include <linux/kobject.h> #include <linux/string.h> |
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#include <linux/pm-trace.h> |
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#include <linux/workqueue.h> |
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#include <linux/debugfs.h> #include <linux/seq_file.h> |
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#include <linux/suspend.h> |
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#include <linux/syscalls.h> |
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#include <linux/pm_runtime.h> |
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#include "power.h" |
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#ifdef CONFIG_PM_SLEEP |
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void lock_system_sleep(void) { current->flags |= PF_FREEZER_SKIP; |
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mutex_lock(&system_transition_mutex); |
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} EXPORT_SYMBOL_GPL(lock_system_sleep); void unlock_system_sleep(void) { /* * Don't use freezer_count() because we don't want the call to * try_to_freeze() here. * * Reason: * Fundamentally, we just don't need it, because freezing condition |
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* doesn't come into effect until we release the * system_transition_mutex lock, since the freezer always works with * system_transition_mutex held. |
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* * More importantly, in the case of hibernation, * unlock_system_sleep() gets called in snapshot_read() and * snapshot_write() when the freezing condition is still in effect. * Which means, if we use try_to_freeze() here, it would make them * enter the refrigerator, thus causing hibernation to lockup. */ current->flags &= ~PF_FREEZER_SKIP; |
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mutex_unlock(&system_transition_mutex); |
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} EXPORT_SYMBOL_GPL(unlock_system_sleep); |
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void ksys_sync_helper(void) { |
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ktime_t start; long elapsed_msecs; start = ktime_get(); |
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ksys_sync(); |
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elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start)); pr_info("Filesystems sync: %ld.%03ld seconds ", elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC); |
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} EXPORT_SYMBOL_GPL(ksys_sync_helper); |
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/* Routines for PM-transition notifications */ static BLOCKING_NOTIFIER_HEAD(pm_chain_head); int register_pm_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&pm_chain_head, nb); } EXPORT_SYMBOL_GPL(register_pm_notifier); int unregister_pm_notifier(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&pm_chain_head, nb); } EXPORT_SYMBOL_GPL(unregister_pm_notifier); |
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int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down) |
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{ |
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int ret; |
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ret = blocking_notifier_call_chain_robust(&pm_chain_head, val_up, val_down, NULL); |
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return notifier_to_errno(ret); |
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} |
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int pm_notifier_call_chain(unsigned long val) { |
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return blocking_notifier_call_chain(&pm_chain_head, val, NULL); |
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} |
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/* If set, devices may be suspended and resumed asynchronously. */ int pm_async_enabled = 1; static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", 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; |
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if (kstrtoul(buf, 10, &val)) |
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return -EINVAL; if (val > 1) return -EINVAL; pm_async_enabled = val; return n; } power_attr(pm_async); |
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#ifdef CONFIG_SUSPEND static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { char *s = buf; suspend_state_t i; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) if (mem_sleep_states[i]) { const char *label = mem_sleep_states[i]; if (mem_sleep_current == i) s += sprintf(s, "[%s] ", label); else s += sprintf(s, "%s ", label); } /* Convert the last space to a newline if needed. */ if (s != buf) *(s-1) = ' '; return (s - buf); } static suspend_state_t decode_suspend_state(const char *buf, size_t n) { suspend_state_t state; char *p; int len; p = memchr(buf, ' ', n); len = p ? p - buf : n; for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { const char *label = mem_sleep_states[state]; if (label && len == strlen(label) && !strncmp(buf, label, len)) return state; } return PM_SUSPEND_ON; } static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { 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; } state = decode_suspend_state(buf, n); if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) mem_sleep_current = state; else error = -EINVAL; out: pm_autosleep_unlock(); return error ? error : n; } power_attr(mem_sleep); |
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/* * sync_on_suspend: invoke ksys_sync_helper() before suspend. * * show() returns whether ksys_sync_helper() is invoked before suspend. * store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. */ bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); static ssize_t sync_on_suspend_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", sync_on_suspend_enabled); } static ssize_t sync_on_suspend_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; sync_on_suspend_enabled = !!val; return n; } power_attr(sync_on_suspend); |
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#endif /* CONFIG_SUSPEND */ |
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#ifdef CONFIG_PM_SLEEP_DEBUG |
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int pm_test_level = TEST_NONE; |
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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", }; |
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static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
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{ 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]); } if (s != buf) /* convert the last space to a newline */ *(s-1) = ' '; return (s - buf); } |
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static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) |
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{ const char * const *s; int level; char *p; int len; int error = -EINVAL; p = memchr(buf, ' ', n); len = p ? p - buf : n; |
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lock_system_sleep(); |
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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; } |
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unlock_system_sleep(); |
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return error ? error : n; } power_attr(pm_test); |
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#endif /* CONFIG_PM_SLEEP_DEBUG */ |
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static char *suspend_step_name(enum suspend_stat_step step) { 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 ""; } } |
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#define suspend_attr(_name) \ static ssize_t _name##_show(struct kobject *kobj, \ struct kobj_attribute *attr, char *buf) \ { \ return sprintf(buf, "%d ", suspend_stats._name); \ } \ static struct kobj_attribute _name = __ATTR_RO(_name) suspend_attr(success); suspend_attr(fail); suspend_attr(failed_freeze); suspend_attr(failed_prepare); suspend_attr(failed_suspend); suspend_attr(failed_suspend_late); suspend_attr(failed_suspend_noirq); suspend_attr(failed_resume); suspend_attr(failed_resume_early); suspend_attr(failed_resume_noirq); static ssize_t last_failed_dev_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { int index; char *last_failed_dev = NULL; index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; index %= REC_FAILED_NUM; last_failed_dev = suspend_stats.failed_devs[index]; return sprintf(buf, "%s ", last_failed_dev); } static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); static ssize_t last_failed_errno_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { int index; int last_failed_errno; index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; index %= REC_FAILED_NUM; last_failed_errno = suspend_stats.errno[index]; return sprintf(buf, "%d ", last_failed_errno); } static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); static ssize_t last_failed_step_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { int index; enum suspend_stat_step step; char *last_failed_step = NULL; index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; index %= REC_FAILED_NUM; step = suspend_stats.failed_steps[index]; last_failed_step = suspend_step_name(step); return sprintf(buf, "%s ", last_failed_step); } static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); static struct attribute *suspend_attrs[] = { &success.attr, &fail.attr, &failed_freeze.attr, &failed_prepare.attr, &failed_suspend.attr, &failed_suspend_late.attr, &failed_suspend_noirq.attr, &failed_resume.attr, &failed_resume_early.attr, &failed_resume_noirq.attr, &last_failed_dev.attr, &last_failed_errno.attr, &last_failed_step.attr, NULL, }; static struct attribute_group suspend_attr_group = { .name = "suspend_stats", .attrs = suspend_attrs, }; #ifdef CONFIG_DEBUG_FS |
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static int suspend_stats_show(struct seq_file *s, void *unused) { 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; |
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seq_printf(s, "%s: %d %s: %d %s: %d %s: %d %s: %d " "%s: %d %s: %d %s: %d %s: %d %s: %d ", |
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"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, |
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"failed_suspend_late", suspend_stats.failed_suspend_late, |
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"failed_suspend_noirq", suspend_stats.failed_suspend_noirq, "failed_resume", suspend_stats.failed_resume, |
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"failed_resume_early", suspend_stats.failed_resume_early, |
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"failed_resume_noirq", suspend_stats.failed_resume_noirq); seq_printf(s, "failures: last_failed_dev:\t%-s ", 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 ", suspend_stats.failed_devs[index]); } seq_printf(s, " last_failed_errno:\t%-d ", 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 ", suspend_stats.errno[index]); } seq_printf(s, " last_failed_step:\t%-s ", 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 ", suspend_step_name( suspend_stats.failed_steps[index])); } return 0; } |
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DEFINE_SHOW_ATTRIBUTE(suspend_stats); |
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static int __init pm_debugfs_init(void) { debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, |
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NULL, NULL, &suspend_stats_fops); |
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return 0; } late_initcall(pm_debugfs_init); #endif /* CONFIG_DEBUG_FS */ |
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#endif /* CONFIG_PM_SLEEP */ |
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#ifdef CONFIG_PM_SLEEP_DEBUG /* * pm_print_times: print time taken by devices to suspend and resume. * * show() returns whether printing of suspend and resume times is enabled. * store() accepts 0 or 1. 0 disables printing and 1 enables it. */ bool pm_print_times_enabled; static ssize_t pm_print_times_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", pm_print_times_enabled); } static ssize_t pm_print_times_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_print_times_enabled = !!val; return n; } power_attr(pm_print_times); static inline void pm_print_times_init(void) { pm_print_times_enabled = !!initcall_debug; } |
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static ssize_t pm_wakeup_irq_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return pm_wakeup_irq ? sprintf(buf, "%u ", pm_wakeup_irq) : -ENODATA; } |
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power_attr_ro(pm_wakeup_irq); |
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bool pm_debug_messages_on __read_mostly; |
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static ssize_t pm_debug_messages_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%d ", pm_debug_messages_on); } static ssize_t pm_debug_messages_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_debug_messages_on = !!val; return n; } power_attr(pm_debug_messages); |
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static int __init pm_debug_messages_setup(char *str) { pm_debug_messages_on = true; return 1; } __setup("pm_debug_messages", pm_debug_messages_setup); |
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/** |
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* __pm_pr_dbg - Print a suspend debug message to the kernel log. * @defer: Whether or not to use printk_deferred() to print the message. |
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* @fmt: Message format. * * The message will be emitted if enabled through the pm_debug_messages * sysfs attribute. */ |
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void __pm_pr_dbg(bool defer, const char *fmt, ...) |
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{ struct va_format vaf; va_list args; if (!pm_debug_messages_on) return; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; |
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if (defer) printk_deferred(KERN_DEBUG "PM: %pV", &vaf); else printk(KERN_DEBUG "PM: %pV", &vaf); |
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va_end(args); } |
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#else /* !CONFIG_PM_SLEEP_DEBUG */ |
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static inline void pm_print_times_init(void) {} #endif /* CONFIG_PM_SLEEP_DEBUG */ |
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struct kobject *power_kobj; |
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/** |
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* state - control system sleep states. |
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* |
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* show() returns available sleep state labels, which may be "mem", "standby", |
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* "freeze" and "disk" (hibernation). * See Documentation/admin-guide/pm/sleep-states.rst for a description of * what they mean. |
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* |
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* store() accepts one of those strings, translates it into the 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, char *buf) |
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{ |
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char *s = buf; #ifdef CONFIG_SUSPEND |
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suspend_state_t i; for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) |
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if (pm_states[i]) s += sprintf(s,"%s ", pm_states[i]); |
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#endif |
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if (hibernation_available()) s += sprintf(s, "disk "); |
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if (s != buf) /* convert the last space to a newline */ *(s-1) = ' '; |
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return (s - buf); } |
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static suspend_state_t decode_state(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; |
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#endif |
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char *p; |
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int len; p = memchr(buf, ' ', n); len = p ? p - buf : n; |
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/* Check hibernation first. */ |
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if (len == 4 && str_has_prefix(buf, "disk")) |
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return PM_SUSPEND_MAX; |
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#ifdef CONFIG_SUSPEND |
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for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { const char *label = pm_states[state]; if (label && len == strlen(label) && !strncmp(buf, label, len)) return state; } |
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#endif |
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return PM_SUSPEND_ON; } static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { 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; } state = decode_state(buf, n); |
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if (state < PM_SUSPEND_MAX) { if (state == PM_SUSPEND_MEM) state = mem_sleep_current; |
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error = pm_suspend(state); |
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} else if (state == PM_SUSPEND_MAX) { |
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error = hibernate(); |
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} else { |
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error = -EINVAL; |
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} |
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out: pm_autosleep_unlock(); |
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return error ? error : n; } power_attr(state); |
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#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. * * 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 |
25985edce
|
699 |
* 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f0
|
700 701 702 703 704 705 706 707 708 |
* '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 ssize_t wakeup_count_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { |
074037ec7
|
709 |
unsigned int val; |
c125e96f0
|
710 |
|
7483b4a4d
|
711 712 713 |
return pm_get_wakeup_count(&val, true) ? sprintf(buf, "%u ", val) : -EINTR; |
c125e96f0
|
714 715 716 717 718 719 |
} static ssize_t wakeup_count_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { |
074037ec7
|
720 |
unsigned int val; |
7483b4a4d
|
721 722 723 724 725 |
int error; error = pm_autosleep_lock(); if (error) return error; |
c125e96f0
|
726 |
|
7483b4a4d
|
727 728 729 730 731 732 |
if (pm_autosleep_state() > PM_SUSPEND_ON) { error = -EBUSY; goto out; } error = -EINVAL; |
074037ec7
|
733 |
if (sscanf(buf, "%u", &val) == 1) { |
c125e96f0
|
734 |
if (pm_save_wakeup_count(val)) |
7483b4a4d
|
735 |
error = n; |
bb177fedd
|
736 737 |
else pm_print_active_wakeup_sources(); |
c125e96f0
|
738 |
} |
7483b4a4d
|
739 740 741 742 |
out: pm_autosleep_unlock(); return error; |
c125e96f0
|
743 744 745 |
} power_attr(wakeup_count); |
7483b4a4d
|
746 747 748 749 750 751 752 753 754 755 756 757 758 759 |
#ifdef CONFIG_PM_AUTOSLEEP static ssize_t autosleep_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { suspend_state_t state = pm_autosleep_state(); if (state == PM_SUSPEND_ON) return sprintf(buf, "off "); #ifdef CONFIG_SUSPEND if (state < PM_SUSPEND_MAX) |
d431cbc53
|
760 761 762 |
return sprintf(buf, "%s ", pm_states[state] ? pm_states[state] : "error"); |
7483b4a4d
|
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 |
#endif #ifdef CONFIG_HIBERNATION return sprintf(buf, "disk "); #else return sprintf(buf, "error"); #endif } static ssize_t autosleep_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) { suspend_state_t state = decode_state(buf, n); int error; if (state == PM_SUSPEND_ON |
040e5bf65
|
780 781 |
&& strcmp(buf, "off") && strcmp(buf, "off ")) |
7483b4a4d
|
782 |
return -EINVAL; |
406e79385
|
783 784 |
if (state == PM_SUSPEND_MEM) state = mem_sleep_current; |
7483b4a4d
|
785 786 787 788 789 790 |
error = pm_autosleep_set_state(state); return error ? error : n; } power_attr(autosleep); #endif /* CONFIG_PM_AUTOSLEEP */ |
b86ff9820
|
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 |
#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); } 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(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 */ |
c125e96f0
|
828 |
#endif /* CONFIG_PM_SLEEP */ |
c5c6ba4e0
|
829 830 |
#ifdef CONFIG_PM_TRACE int pm_trace_enabled; |
386f275f5
|
831 832 |
static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) |
c5c6ba4e0
|
833 834 835 836 837 838 |
{ return sprintf(buf, "%d ", pm_trace_enabled); } static ssize_t |
386f275f5
|
839 840 |
pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n) |
c5c6ba4e0
|
841 842 843 844 845 |
{ int val; if (sscanf(buf, "%d", &val) == 1) { pm_trace_enabled = !!val; |
9dceefe48
|
846 847 848 849 850 851 |
if (pm_trace_enabled) { pr_warn("PM: Enabling pm_trace changes system date and time during resume. " "PM: Correct system time has to be restored manually after resume. "); } |
c5c6ba4e0
|
852 853 854 855 856 857 |
return n; } return -EINVAL; } power_attr(pm_trace); |
d33ac60be
|
858 859 860 861 862 863 864 |
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); } |
a1e9ca696
|
865 |
power_attr_ro(pm_trace_dev_match); |
d33ac60be
|
866 |
|
0e7d56e3d
|
867 |
#endif /* CONFIG_PM_TRACE */ |
c5c6ba4e0
|
868 |
|
957d1282b
|
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 |
#ifdef CONFIG_FREEZER static ssize_t pm_freeze_timeout_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { return sprintf(buf, "%u ", 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*/ |
c5c6ba4e0
|
893 894 |
static struct attribute * g[] = { &state_attr.attr, |
0e7d56e3d
|
895 |
#ifdef CONFIG_PM_TRACE |
c5c6ba4e0
|
896 |
&pm_trace_attr.attr, |
d33ac60be
|
897 |
&pm_trace_dev_match_attr.attr, |
0e7d56e3d
|
898 |
#endif |
0e06b4a89
|
899 900 |
#ifdef CONFIG_PM_SLEEP &pm_async_attr.attr, |
c125e96f0
|
901 |
&wakeup_count_attr.attr, |
406e79385
|
902 903 |
#ifdef CONFIG_SUSPEND &mem_sleep_attr.attr, |
c052bf82c
|
904 |
&sync_on_suspend_attr.attr, |
406e79385
|
905 |
#endif |
7483b4a4d
|
906 907 908 |
#ifdef CONFIG_PM_AUTOSLEEP &autosleep_attr.attr, #endif |
b86ff9820
|
909 910 911 912 |
#ifdef CONFIG_PM_WAKELOCKS &wake_lock_attr.attr, &wake_unlock_attr.attr, #endif |
b2df1d4f8
|
913 |
#ifdef CONFIG_PM_SLEEP_DEBUG |
e516a1db4
|
914 |
&pm_test_attr.attr, |
4b7760ba0
|
915 |
&pm_print_times_attr.attr, |
a6f5f0dd4
|
916 |
&pm_wakeup_irq_attr.attr, |
8d8b2441d
|
917 |
&pm_debug_messages_attr.attr, |
0e7d56e3d
|
918 |
#endif |
0e06b4a89
|
919 |
#endif |
957d1282b
|
920 921 922 |
#ifdef CONFIG_FREEZER &pm_freeze_timeout_attr.attr, #endif |
c5c6ba4e0
|
923 924 |
NULL, }; |
1da177e4c
|
925 |
|
1d0c6e593
|
926 |
static const struct attribute_group attr_group = { |
1da177e4c
|
927 928 |
.attrs = g, }; |
2c8db5bef
|
929 930 931 932 933 934 935 |
static const struct attribute_group *attr_groups[] = { &attr_group, #ifdef CONFIG_PM_SLEEP &suspend_attr_group, #endif NULL, }; |
5e928f77a
|
936 |
struct workqueue_struct *pm_wq; |
7b199ca20
|
937 |
EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77a
|
938 939 940 |
static int __init pm_start_workqueue(void) { |
58a69cb47
|
941 |
pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77a
|
942 943 944 |
return pm_wq ? 0 : -ENOMEM; } |
5e928f77a
|
945 |
|
1da177e4c
|
946 947 |
static int __init pm_init(void) { |
5e928f77a
|
948 949 950 |
int error = pm_start_workqueue(); if (error) return error; |
ac5c24ec1
|
951 |
hibernate_image_size_init(); |
ddeb64870
|
952 |
hibernate_reserved_size_init(); |
fa7fd6fa3
|
953 |
pm_states_init(); |
d76e15fb2
|
954 955 |
power_kobj = kobject_create_and_add("power", NULL); if (!power_kobj) |
039a5dcd2
|
956 |
return -ENOMEM; |
2c8db5bef
|
957 |
error = sysfs_create_groups(power_kobj, attr_groups); |
7483b4a4d
|
958 959 |
if (error) return error; |
b2df1d4f8
|
960 |
pm_print_times_init(); |
7483b4a4d
|
961 |
return pm_autosleep_init(); |
1da177e4c
|
962 963 964 |
} core_initcall(pm_init); |