2005-04-17 06:20:36 +08:00
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/*
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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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2006-12-07 12:36:06 +08:00
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#include <linux/module.h>
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2005-04-17 06:20:36 +08:00
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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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2006-06-23 05:47:18 +08:00
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#include <linux/console.h>
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2006-09-26 14:32:48 +08:00
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#include <linux/cpu.h>
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2006-09-26 14:32:58 +08:00
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#include <linux/resume-trace.h>
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2006-12-07 12:34:23 +08:00
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#include <linux/freezer.h>
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2007-02-10 17:43:03 +08:00
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#include <linux/vmstat.h>
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2005-04-17 06:20:36 +08:00
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#include "power.h"
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2007-07-19 16:47:36 +08:00
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BLOCKING_NOTIFIER_HEAD(pm_chain_head);
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2006-12-07 12:34:35 +08:00
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DEFINE_MUTEX(pm_mutex);
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2005-04-17 06:20:36 +08:00
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2007-07-30 05:27:18 +08:00
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#ifdef CONFIG_SUSPEND
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/* This is just an arbitrary number */
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#define FREE_PAGE_NUMBER (100)
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2005-11-30 11:34:37 +08:00
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struct pm_ops *pm_ops;
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2005-04-17 06:20:36 +08:00
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/**
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* pm_set_ops - Set the global power method table.
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* @ops: Pointer to ops structure.
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*/
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void pm_set_ops(struct pm_ops * ops)
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{
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2006-12-07 12:34:35 +08:00
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mutex_lock(&pm_mutex);
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2005-04-17 06:20:36 +08:00
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pm_ops = ops;
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2006-12-07 12:34:35 +08:00
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mutex_unlock(&pm_mutex);
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2005-04-17 06:20:36 +08:00
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}
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2007-05-01 06:09:54 +08:00
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/**
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* pm_valid_only_mem - generic memory-only valid callback
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*
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* pm_ops 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 pm_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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2007-02-10 17:43:31 +08:00
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static inline void pm_finish(suspend_state_t state)
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{
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if (pm_ops->finish)
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pm_ops->finish(state);
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}
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2005-04-17 06:20:36 +08:00
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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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2007-07-19 16:47:38 +08:00
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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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2005-04-17 06:20:36 +08:00
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*/
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2007-07-19 16:47:38 +08:00
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static int suspend_prepare(void)
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2005-04-17 06:20:36 +08:00
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{
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2006-09-26 14:32:48 +08:00
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int error;
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2005-03-19 05:27:13 +08:00
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unsigned int free_pages;
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2005-04-17 06:20:36 +08:00
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if (!pm_ops || !pm_ops->enter)
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return -EPERM;
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2007-07-19 16:47:36 +08:00
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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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2005-04-17 06:20:36 +08:00
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pm_prepare_console();
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if (freeze_processes()) {
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error = -EAGAIN;
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goto Thaw;
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}
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2007-07-19 16:47:38 +08:00
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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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2005-03-19 05:27:13 +08:00
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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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2007-02-10 17:43:31 +08:00
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if (!error)
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return 0;
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2005-04-17 06:20:36 +08:00
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Thaw:
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thaw_processes();
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pm_restore_console();
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2007-07-19 16:47:36 +08:00
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Finish:
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pm_notifier_call_chain(PM_POST_SUSPEND);
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2005-04-17 06:20:36 +08:00
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return error;
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}
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2007-04-26 17:43:58 +08:00
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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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2005-04-17 06:20:36 +08:00
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2007-07-19 16:47:38 +08:00
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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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2007-10-18 18:04:37 +08:00
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static int suspend_enter(suspend_state_t state)
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2005-04-17 06:20:36 +08:00
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{
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int error = 0;
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2007-04-26 17:43:58 +08:00
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arch_suspend_disable_irqs();
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BUG_ON(!irqs_disabled());
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2005-04-17 06:20:36 +08:00
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if ((error = device_power_down(PMSG_SUSPEND))) {
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printk(KERN_ERR "Some devices failed to power down\n");
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goto Done;
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}
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error = pm_ops->enter(state);
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device_power_up();
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Done:
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2007-04-26 17:43:58 +08:00
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arch_suspend_enable_irqs();
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BUG_ON(irqs_disabled());
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2005-04-17 06:20:36 +08:00
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return error;
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}
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2007-07-19 16:47:38 +08:00
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/**
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* suspend_devices_and_enter - suspend devices and enter the desired system sleep
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* 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 (!pm_ops)
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return -ENOSYS;
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if (pm_ops->set_target) {
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error = pm_ops->set_target(state);
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if (error)
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return error;
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}
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suspend_console();
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error = device_suspend(PMSG_SUSPEND);
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if (error) {
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printk(KERN_ERR "Some devices failed to suspend\n");
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goto Resume_console;
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}
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if (pm_ops->prepare) {
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error = pm_ops->prepare(state);
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if (error)
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goto Resume_devices;
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}
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error = disable_nonboot_cpus();
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if (!error)
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suspend_enter(state);
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enable_nonboot_cpus();
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pm_finish(state);
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Resume_devices:
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device_resume();
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Resume_console:
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resume_console();
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return error;
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}
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2005-04-17 06:20:36 +08:00
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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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2007-07-19 16:47:38 +08:00
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static void suspend_finish(void)
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2005-04-17 06:20:36 +08:00
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{
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thaw_processes();
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pm_restore_console();
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2007-07-19 16:47:36 +08:00
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pm_notifier_call_chain(PM_POST_SUSPEND);
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2005-04-17 06:20:36 +08:00
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}
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2006-06-25 20:47:56 +08:00
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static const char * const pm_states[PM_SUSPEND_MAX] = {
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2005-04-17 06:20:36 +08:00
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[PM_SUSPEND_STANDBY] = "standby",
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[PM_SUSPEND_MEM] = "mem",
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};
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2005-11-30 11:34:37 +08:00
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static inline int valid_state(suspend_state_t state)
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{
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2007-05-09 17:33:18 +08:00
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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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2007-05-01 06:09:55 +08:00
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* implies that none are valid. */
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if (!pm_ops || !pm_ops->valid || !pm_ops->valid(state))
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2005-11-30 11:34:37 +08:00
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return 0;
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return 1;
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}
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2005-04-17 06:20:36 +08:00
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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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2005-11-30 11:34:37 +08:00
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if (!valid_state(state))
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2005-10-31 07:00:01 +08:00
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return -ENODEV;
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2006-12-07 12:34:35 +08:00
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if (!mutex_trylock(&pm_mutex))
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2005-04-17 06:20:36 +08:00
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return -EBUSY;
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2005-05-09 23:07:00 +08:00
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pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
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2007-07-19 16:47:38 +08:00
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if ((error = suspend_prepare()))
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2005-04-17 06:20:36 +08:00
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goto Unlock;
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2005-05-09 23:07:00 +08:00
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pr_debug("PM: Entering %s sleep\n", pm_states[state]);
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2007-07-19 16:47:38 +08:00
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error = suspend_devices_and_enter(state);
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2005-04-17 06:20:36 +08:00
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2005-05-09 23:07:00 +08:00
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pr_debug("PM: Finishing wakeup.\n");
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2007-07-19 16:47:38 +08:00
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suspend_finish();
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2005-04-17 06:20:36 +08:00
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Unlock:
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2006-12-07 12:34:35 +08:00
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mutex_unlock(&pm_mutex);
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2005-04-17 06:20:36 +08:00
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return error;
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}
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/**
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* pm_suspend - Externally visible function for suspending system.
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2007-05-09 17:33:18 +08:00
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* @state: Enumerated value of state to enter.
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2005-04-17 06:20:36 +08:00
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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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2005-03-19 05:20:46 +08:00
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if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX)
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2005-04-17 06:20:36 +08:00
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return enter_state(state);
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return -EINVAL;
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}
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2006-12-07 12:36:06 +08:00
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EXPORT_SYMBOL(pm_suspend);
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2005-04-17 06:20:36 +08:00
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2007-07-30 05:27:18 +08:00
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#endif /* CONFIG_SUSPEND */
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2005-04-17 06:20:36 +08:00
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decl_subsys(power,NULL,NULL);
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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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2007-04-14 04:15:19 +08:00
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static ssize_t state_show(struct kset *kset, char *buf)
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2005-04-17 06:20:36 +08:00
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{
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2007-07-30 05:27:18 +08:00
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char *s = buf;
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#ifdef CONFIG_SUSPEND
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2005-04-17 06:20:36 +08:00
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int i;
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for (i = 0; i < PM_SUSPEND_MAX; i++) {
|
2005-11-30 11:34:37 +08:00
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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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2005-04-17 06:20:36 +08:00
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}
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2007-07-30 05:27:18 +08:00
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#endif
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2007-07-30 05:24:36 +08:00
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#ifdef CONFIG_HIBERNATION
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2007-05-09 17:33:18 +08:00
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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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2005-04-17 06:20:36 +08:00
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return (s - buf);
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}
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2007-04-14 04:15:19 +08:00
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static ssize_t state_store(struct kset *kset, const char *buf, size_t n)
|
2005-04-17 06:20:36 +08:00
|
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{
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2007-07-30 05:27:18 +08:00
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#ifdef CONFIG_SUSPEND
|
2005-04-17 06:20:36 +08:00
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suspend_state_t state = PM_SUSPEND_STANDBY;
|
2006-06-25 20:47:56 +08:00
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const char * const *s;
|
2007-07-30 05:27:18 +08:00
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#endif
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2005-04-17 06:20:36 +08:00
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char *p;
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int len;
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2007-07-30 05:27:18 +08:00
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int error = -EINVAL;
|
2005-04-17 06:20:36 +08:00
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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|
2007-05-09 17:33:18 +08:00
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/* First, check if we are requested to hibernate */
|
2007-05-17 13:11:19 +08:00
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if (len == 4 && !strncmp(buf, "disk", len)) {
|
2007-05-09 17:33:18 +08:00
|
|
|
error = hibernate();
|
2007-07-30 05:27:18 +08:00
|
|
|
goto Exit;
|
2007-05-09 17:33:18 +08:00
|
|
|
}
|
|
|
|
|
2007-07-30 05:27:18 +08:00
|
|
|
#ifdef CONFIG_SUSPEND
|
2005-04-17 06:20:36 +08:00
|
|
|
for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) {
|
2007-05-17 13:11:19 +08:00
|
|
|
if (*s && len == strlen(*s) && !strncmp(buf, *s, len))
|
2005-04-17 06:20:36 +08:00
|
|
|
break;
|
|
|
|
}
|
2006-04-28 09:39:17 +08:00
|
|
|
if (state < PM_SUSPEND_MAX && *s)
|
2005-04-17 06:20:36 +08:00
|
|
|
error = enter_state(state);
|
2007-07-30 05:27:18 +08:00
|
|
|
#endif
|
|
|
|
|
|
|
|
Exit:
|
2005-04-17 06:20:36 +08:00
|
|
|
return error ? error : n;
|
|
|
|
}
|
|
|
|
|
|
|
|
power_attr(state);
|
|
|
|
|
2006-09-26 14:32:58 +08:00
|
|
|
#ifdef CONFIG_PM_TRACE
|
|
|
|
int pm_trace_enabled;
|
|
|
|
|
2007-04-14 04:15:19 +08:00
|
|
|
static ssize_t pm_trace_show(struct kset *kset, char *buf)
|
2006-09-26 14:32:58 +08:00
|
|
|
{
|
|
|
|
return sprintf(buf, "%d\n", pm_trace_enabled);
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t
|
2007-04-14 04:15:19 +08:00
|
|
|
pm_trace_store(struct kset *kset, const char *buf, size_t n)
|
2006-09-26 14:32:58 +08:00
|
|
|
{
|
|
|
|
int val;
|
|
|
|
|
|
|
|
if (sscanf(buf, "%d", &val) == 1) {
|
|
|
|
pm_trace_enabled = !!val;
|
|
|
|
return n;
|
|
|
|
}
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
power_attr(pm_trace);
|
|
|
|
|
|
|
|
static struct attribute * g[] = {
|
|
|
|
&state_attr.attr,
|
|
|
|
&pm_trace_attr.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
#else
|
2005-04-17 06:20:36 +08:00
|
|
|
static struct attribute * g[] = {
|
|
|
|
&state_attr.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
2006-09-26 14:32:58 +08:00
|
|
|
#endif /* CONFIG_PM_TRACE */
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
static struct attribute_group attr_group = {
|
|
|
|
.attrs = g,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static int __init pm_init(void)
|
|
|
|
{
|
|
|
|
int error = subsystem_register(&power_subsys);
|
|
|
|
if (!error)
|
2007-04-14 04:15:19 +08:00
|
|
|
error = sysfs_create_group(&power_subsys.kobj,&attr_group);
|
2005-04-17 06:20:36 +08:00
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
core_initcall(pm_init);
|