2005-04-17 00:20:36 +02:00
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/*
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* kernel/power/disk.c - Suspend-to-disk support.
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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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* Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
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*
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* This file is released under the GPLv2.
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*
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*/
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#include <linux/suspend.h>
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#include <linux/syscalls.h>
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#include <linux/reboot.h>
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#include <linux/string.h>
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#include <linux/device.h>
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#include <linux/delay.h>
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#include <linux/fs.h>
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2005-07-12 22:58:07 +02:00
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#include <linux/mount.h>
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2005-04-17 00:20:36 +02:00
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#include "power.h"
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extern suspend_disk_method_t pm_disk_mode;
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extern struct pm_ops * pm_ops;
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extern int swsusp_suspend(void);
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extern int swsusp_write(void);
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extern int swsusp_check(void);
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extern int swsusp_read(void);
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extern void swsusp_close(void);
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extern int swsusp_resume(void);
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extern int swsusp_free(void);
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static int noresume = 0;
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char resume_file[256] = CONFIG_PM_STD_PARTITION;
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dev_t swsusp_resume_device;
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/**
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* power_down - Shut machine down for hibernate.
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* @mode: Suspend-to-disk mode
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*
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* Use the platform driver, if configured so, and return gracefully if it
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* fails.
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* Otherwise, try to power off and reboot. If they fail, halt the machine,
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* there ain't no turning back.
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*/
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static void power_down(suspend_disk_method_t mode)
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{
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unsigned long flags;
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int error = 0;
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local_irq_save(flags);
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switch(mode) {
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case PM_DISK_PLATFORM:
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device_shutdown();
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error = pm_ops->enter(PM_SUSPEND_DISK);
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break;
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case PM_DISK_SHUTDOWN:
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printk("Powering off system\n");
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device_shutdown();
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machine_power_off();
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break;
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case PM_DISK_REBOOT:
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device_shutdown();
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machine_restart(NULL);
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break;
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}
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machine_halt();
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/* Valid image is on the disk, if we continue we risk serious data corruption
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after resume. */
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printk(KERN_CRIT "Please power me down manually\n");
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while(1);
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}
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static int in_suspend __nosavedata = 0;
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/**
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* free_some_memory - Try to free as much memory as possible
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*
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* ... but do not OOM-kill anyone
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*
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* Notice: all userland should be stopped at this point, or
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* livelock is possible.
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*/
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static void free_some_memory(void)
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{
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unsigned int i = 0;
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unsigned int tmp;
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unsigned long pages = 0;
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char *p = "-\\|/";
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printk("Freeing memory... ");
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while ((tmp = shrink_all_memory(10000))) {
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pages += tmp;
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printk("\b%c", p[i]);
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i++;
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if (i > 3)
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i = 0;
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}
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printk("\bdone (%li pages freed)\n", pages);
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}
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static inline void platform_finish(void)
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{
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if (pm_disk_mode == PM_DISK_PLATFORM) {
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if (pm_ops && pm_ops->finish)
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pm_ops->finish(PM_SUSPEND_DISK);
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}
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}
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static void finish(void)
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{
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device_resume();
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platform_finish();
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thaw_processes();
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2005-06-25 23:55:06 +02:00
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enable_nonboot_cpus();
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2005-04-17 00:20:36 +02:00
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pm_restore_console();
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}
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static int prepare_processes(void)
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{
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int error;
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pm_prepare_console();
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sys_sync();
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2005-06-25 23:55:06 +02:00
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disable_nonboot_cpus();
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2005-04-17 00:20:36 +02:00
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if (freeze_processes()) {
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error = -EBUSY;
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2005-06-25 23:55:06 +02:00
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goto thaw;
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2005-04-17 00:20:36 +02:00
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}
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if (pm_disk_mode == PM_DISK_PLATFORM) {
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if (pm_ops && pm_ops->prepare) {
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if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
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2005-06-25 23:55:06 +02:00
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goto thaw;
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2005-04-17 00:20:36 +02:00
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}
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}
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/* Free memory before shutting down devices. */
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free_some_memory();
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return 0;
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2005-06-25 23:55:06 +02:00
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thaw:
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thaw_processes();
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enable_nonboot_cpus();
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pm_restore_console();
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return error;
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2005-04-17 00:20:36 +02:00
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}
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static void unprepare_processes(void)
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{
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2005-06-25 23:55:06 +02:00
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platform_finish();
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2005-04-17 00:20:36 +02:00
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thaw_processes();
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2005-06-25 23:55:06 +02:00
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enable_nonboot_cpus();
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2005-04-17 00:20:36 +02:00
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pm_restore_console();
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}
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static int prepare_devices(void)
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{
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int error;
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2005-06-25 23:55:06 +02:00
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if ((error = device_suspend(PMSG_FREEZE)))
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2005-04-17 00:20:36 +02:00
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printk("Some devices failed to suspend\n");
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2005-06-25 23:55:06 +02:00
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return error;
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2005-04-17 00:20:36 +02:00
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}
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/**
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* pm_suspend_disk - The granpappy of power management.
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*
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* If we're going through the firmware, then get it over with quickly.
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*
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* If not, then call swsusp to do its thing, then figure out how
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* to power down the system.
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*/
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int pm_suspend_disk(void)
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{
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int error;
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error = prepare_processes();
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2005-06-25 23:55:06 +02:00
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if (error)
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return error;
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error = prepare_devices();
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2005-04-17 00:20:36 +02:00
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if (error) {
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unprepare_processes();
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return error;
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}
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pr_debug("PM: Attempting to suspend to disk.\n");
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if (pm_disk_mode == PM_DISK_FIRMWARE)
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return pm_ops->enter(PM_SUSPEND_DISK);
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pr_debug("PM: snapshotting memory.\n");
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in_suspend = 1;
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if ((error = swsusp_suspend()))
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goto Done;
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if (in_suspend) {
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pr_debug("PM: writing image.\n");
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error = swsusp_write();
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if (!error)
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power_down(pm_disk_mode);
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} else
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pr_debug("PM: Image restored successfully.\n");
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swsusp_free();
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Done:
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finish();
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return error;
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}
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/**
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* software_resume - Resume from a saved image.
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*
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* Called as a late_initcall (so all devices are discovered and
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* initialized), we call swsusp to see if we have a saved image or not.
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* If so, we quiesce devices, the restore the saved image. We will
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* return above (in pm_suspend_disk() ) if everything goes well.
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* Otherwise, we fail gracefully and return to the normally
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* scheduled program.
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*
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*/
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static int software_resume(void)
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{
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int error;
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2005-07-08 02:56:43 +02:00
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if (!swsusp_resume_device) {
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if (!strlen(resume_file))
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return -ENOENT;
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swsusp_resume_device = name_to_dev_t(resume_file);
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pr_debug("swsusp: Resume From Partition %s\n", resume_file);
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} else {
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pr_debug("swsusp: Resume From Partition %d:%d\n",
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MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
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}
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2005-04-17 00:20:36 +02:00
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if (noresume) {
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/**
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* FIXME: If noresume is specified, we need to find the partition
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* and reset it back to normal swap space.
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*/
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return 0;
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}
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pr_debug("PM: Checking swsusp image.\n");
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if ((error = swsusp_check()))
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goto Done;
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pr_debug("PM: Preparing processes for restore.\n");
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if ((error = prepare_processes())) {
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swsusp_close();
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2005-06-25 23:55:06 +02:00
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goto Done;
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2005-04-17 00:20:36 +02:00
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}
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pr_debug("PM: Reading swsusp image.\n");
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if ((error = swsusp_read()))
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goto Cleanup;
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pr_debug("PM: Preparing devices for restore.\n");
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if ((error = prepare_devices()))
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goto Free;
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mb();
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pr_debug("PM: Restoring saved image.\n");
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swsusp_resume();
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pr_debug("PM: Restore failed, recovering.n");
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finish();
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Free:
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swsusp_free();
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Cleanup:
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unprepare_processes();
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Done:
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pr_debug("PM: Resume from disk failed.\n");
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return 0;
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}
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late_initcall(software_resume);
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static char * pm_disk_modes[] = {
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[PM_DISK_FIRMWARE] = "firmware",
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[PM_DISK_PLATFORM] = "platform",
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[PM_DISK_SHUTDOWN] = "shutdown",
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[PM_DISK_REBOOT] = "reboot",
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};
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/**
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* disk - Control suspend-to-disk mode
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*
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* Suspend-to-disk can be handled in several ways. The greatest
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* distinction is who writes memory to disk - the firmware or the OS.
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* If the firmware does it, we assume that it also handles suspending
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* the system.
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* If the OS does it, then we have three options for putting the system
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* to sleep - using the platform driver (e.g. ACPI or other PM registers),
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* powering off the system or rebooting the system (for testing).
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*
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* The system will support either 'firmware' or 'platform', and that is
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* known a priori (and encoded in pm_ops). But, the user may choose
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* 'shutdown' or 'reboot' as alternatives.
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*
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* show() will display what the mode is currently set to.
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* store() will accept one of
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*
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* 'firmware'
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* 'platform'
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* 'shutdown'
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* 'reboot'
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*
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* It will only change to 'firmware' or 'platform' if the system
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* supports it (as determined from pm_ops->pm_disk_mode).
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*/
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static ssize_t disk_show(struct subsystem * subsys, char * buf)
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{
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return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
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}
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static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
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{
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int error = 0;
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int i;
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int len;
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char *p;
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suspend_disk_method_t mode = 0;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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down(&pm_sem);
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for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
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if (!strncmp(buf, pm_disk_modes[i], len)) {
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mode = i;
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break;
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}
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}
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if (mode) {
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if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
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pm_disk_mode = mode;
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else {
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if (pm_ops && pm_ops->enter &&
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(mode == pm_ops->pm_disk_mode))
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pm_disk_mode = mode;
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else
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error = -EINVAL;
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}
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} else
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error = -EINVAL;
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pr_debug("PM: suspend-to-disk mode set to '%s'\n",
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pm_disk_modes[mode]);
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up(&pm_sem);
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return error ? error : n;
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}
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power_attr(disk);
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static ssize_t resume_show(struct subsystem * subsys, char *buf)
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{
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return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
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MINOR(swsusp_resume_device));
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}
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static ssize_t resume_store(struct subsystem * subsys, const char * buf, size_t n)
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{
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int len;
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char *p;
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unsigned int maj, min;
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int error = -EINVAL;
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dev_t res;
|
|
|
|
|
|
|
|
p = memchr(buf, '\n', n);
|
|
|
|
len = p ? p - buf : n;
|
|
|
|
|
|
|
|
if (sscanf(buf, "%u:%u", &maj, &min) == 2) {
|
|
|
|
res = MKDEV(maj,min);
|
|
|
|
if (maj == MAJOR(res) && min == MINOR(res)) {
|
|
|
|
swsusp_resume_device = res;
|
|
|
|
printk("Attempting manual resume\n");
|
|
|
|
noresume = 0;
|
|
|
|
software_resume();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return error >= 0 ? n : error;
|
|
|
|
}
|
|
|
|
|
|
|
|
power_attr(resume);
|
|
|
|
|
|
|
|
static struct attribute * g[] = {
|
|
|
|
&disk_attr.attr,
|
|
|
|
&resume_attr.attr,
|
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static struct attribute_group attr_group = {
|
|
|
|
.attrs = g,
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static int __init pm_disk_init(void)
|
|
|
|
{
|
|
|
|
return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
|
|
|
|
}
|
|
|
|
|
|
|
|
core_initcall(pm_disk_init);
|
|
|
|
|
|
|
|
|
|
|
|
static int __init resume_setup(char *str)
|
|
|
|
{
|
|
|
|
if (noresume)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
strncpy( resume_file, str, 255 );
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __init noresume_setup(char *str)
|
|
|
|
{
|
|
|
|
noresume = 1;
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
__setup("noresume", noresume_setup);
|
|
|
|
__setup("resume=", resume_setup);
|