1008 строки
23 KiB
C
1008 строки
23 KiB
C
/*
|
|
* kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
|
|
*
|
|
* Copyright (c) 2003 Patrick Mochel
|
|
* Copyright (c) 2003 Open Source Development Lab
|
|
* Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
|
|
* Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
|
|
*
|
|
* This file is released under the GPLv2.
|
|
*/
|
|
|
|
#include <linux/suspend.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/string.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/console.h>
|
|
#include <linux/cpu.h>
|
|
#include <linux/freezer.h>
|
|
#include <linux/gfp.h>
|
|
#include <scsi/scsi_scan.h>
|
|
#include <asm/suspend.h>
|
|
|
|
#include "power.h"
|
|
|
|
|
|
static int noresume = 0;
|
|
static char resume_file[256] = CONFIG_PM_STD_PARTITION;
|
|
dev_t swsusp_resume_device;
|
|
sector_t swsusp_resume_block;
|
|
int in_suspend __nosavedata = 0;
|
|
|
|
enum {
|
|
HIBERNATION_INVALID,
|
|
HIBERNATION_PLATFORM,
|
|
HIBERNATION_TEST,
|
|
HIBERNATION_TESTPROC,
|
|
HIBERNATION_SHUTDOWN,
|
|
HIBERNATION_REBOOT,
|
|
/* keep last */
|
|
__HIBERNATION_AFTER_LAST
|
|
};
|
|
#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
|
|
#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
|
|
|
|
static int hibernation_mode = HIBERNATION_SHUTDOWN;
|
|
|
|
static struct platform_hibernation_ops *hibernation_ops;
|
|
|
|
/**
|
|
* hibernation_set_ops - set the global hibernate operations
|
|
* @ops: the hibernation operations to use in subsequent hibernation transitions
|
|
*/
|
|
|
|
void hibernation_set_ops(struct platform_hibernation_ops *ops)
|
|
{
|
|
if (ops && !(ops->begin && ops->end && ops->pre_snapshot
|
|
&& ops->prepare && ops->finish && ops->enter && ops->pre_restore
|
|
&& ops->restore_cleanup)) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
mutex_lock(&pm_mutex);
|
|
hibernation_ops = ops;
|
|
if (ops)
|
|
hibernation_mode = HIBERNATION_PLATFORM;
|
|
else if (hibernation_mode == HIBERNATION_PLATFORM)
|
|
hibernation_mode = HIBERNATION_SHUTDOWN;
|
|
|
|
mutex_unlock(&pm_mutex);
|
|
}
|
|
|
|
static bool entering_platform_hibernation;
|
|
|
|
bool system_entering_hibernation(void)
|
|
{
|
|
return entering_platform_hibernation;
|
|
}
|
|
EXPORT_SYMBOL(system_entering_hibernation);
|
|
|
|
#ifdef CONFIG_PM_DEBUG
|
|
static void hibernation_debug_sleep(void)
|
|
{
|
|
printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
|
|
mdelay(5000);
|
|
}
|
|
|
|
static int hibernation_testmode(int mode)
|
|
{
|
|
if (hibernation_mode == mode) {
|
|
hibernation_debug_sleep();
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int hibernation_test(int level)
|
|
{
|
|
if (pm_test_level == level) {
|
|
hibernation_debug_sleep();
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
#else /* !CONFIG_PM_DEBUG */
|
|
static int hibernation_testmode(int mode) { return 0; }
|
|
static int hibernation_test(int level) { return 0; }
|
|
#endif /* !CONFIG_PM_DEBUG */
|
|
|
|
/**
|
|
* platform_begin - tell the platform driver that we're starting
|
|
* hibernation
|
|
*/
|
|
|
|
static int platform_begin(int platform_mode)
|
|
{
|
|
return (platform_mode && hibernation_ops) ?
|
|
hibernation_ops->begin() : 0;
|
|
}
|
|
|
|
/**
|
|
* platform_end - tell the platform driver that we've entered the
|
|
* working state
|
|
*/
|
|
|
|
static void platform_end(int platform_mode)
|
|
{
|
|
if (platform_mode && hibernation_ops)
|
|
hibernation_ops->end();
|
|
}
|
|
|
|
/**
|
|
* platform_pre_snapshot - prepare the machine for hibernation using the
|
|
* platform driver if so configured and return an error code if it fails
|
|
*/
|
|
|
|
static int platform_pre_snapshot(int platform_mode)
|
|
{
|
|
return (platform_mode && hibernation_ops) ?
|
|
hibernation_ops->pre_snapshot() : 0;
|
|
}
|
|
|
|
/**
|
|
* platform_leave - prepare the machine for switching to the normal mode
|
|
* of operation using the platform driver (called with interrupts disabled)
|
|
*/
|
|
|
|
static void platform_leave(int platform_mode)
|
|
{
|
|
if (platform_mode && hibernation_ops)
|
|
hibernation_ops->leave();
|
|
}
|
|
|
|
/**
|
|
* platform_finish - switch the machine to the normal mode of operation
|
|
* using the platform driver (must be called after platform_prepare())
|
|
*/
|
|
|
|
static void platform_finish(int platform_mode)
|
|
{
|
|
if (platform_mode && hibernation_ops)
|
|
hibernation_ops->finish();
|
|
}
|
|
|
|
/**
|
|
* platform_pre_restore - prepare the platform for the restoration from a
|
|
* hibernation image. If the restore fails after this function has been
|
|
* called, platform_restore_cleanup() must be called.
|
|
*/
|
|
|
|
static int platform_pre_restore(int platform_mode)
|
|
{
|
|
return (platform_mode && hibernation_ops) ?
|
|
hibernation_ops->pre_restore() : 0;
|
|
}
|
|
|
|
/**
|
|
* platform_restore_cleanup - switch the platform to the normal mode of
|
|
* operation after a failing restore. If platform_pre_restore() has been
|
|
* called before the failing restore, this function must be called too,
|
|
* regardless of the result of platform_pre_restore().
|
|
*/
|
|
|
|
static void platform_restore_cleanup(int platform_mode)
|
|
{
|
|
if (platform_mode && hibernation_ops)
|
|
hibernation_ops->restore_cleanup();
|
|
}
|
|
|
|
/**
|
|
* platform_recover - recover the platform from a failure to suspend
|
|
* devices.
|
|
*/
|
|
|
|
static void platform_recover(int platform_mode)
|
|
{
|
|
if (platform_mode && hibernation_ops && hibernation_ops->recover)
|
|
hibernation_ops->recover();
|
|
}
|
|
|
|
/**
|
|
* swsusp_show_speed - print the time elapsed between two events.
|
|
* @start: Starting event.
|
|
* @stop: Final event.
|
|
* @nr_pages - number of pages processed between @start and @stop
|
|
* @msg - introductory message to print
|
|
*/
|
|
|
|
void swsusp_show_speed(struct timeval *start, struct timeval *stop,
|
|
unsigned nr_pages, char *msg)
|
|
{
|
|
s64 elapsed_centisecs64;
|
|
int centisecs;
|
|
int k;
|
|
int kps;
|
|
|
|
elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
|
|
do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
|
|
centisecs = elapsed_centisecs64;
|
|
if (centisecs == 0)
|
|
centisecs = 1; /* avoid div-by-zero */
|
|
k = nr_pages * (PAGE_SIZE / 1024);
|
|
kps = (k * 100) / centisecs;
|
|
printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
|
|
msg, k,
|
|
centisecs / 100, centisecs % 100,
|
|
kps / 1000, (kps % 1000) / 10);
|
|
}
|
|
|
|
/**
|
|
* create_image - freeze devices that need to be frozen with interrupts
|
|
* off, create the hibernation image and thaw those devices. Control
|
|
* reappears in this routine after a restore.
|
|
*/
|
|
|
|
static int create_image(int platform_mode)
|
|
{
|
|
int error;
|
|
|
|
error = arch_prepare_suspend();
|
|
if (error)
|
|
return error;
|
|
|
|
/* At this point, dpm_suspend_start() has been called, but *not*
|
|
* dpm_suspend_noirq(). We *must* call dpm_suspend_noirq() now.
|
|
* Otherwise, drivers for some devices (e.g. interrupt controllers)
|
|
* become desynchronized with the actual state of the hardware
|
|
* at resume time, and evil weirdness ensues.
|
|
*/
|
|
error = dpm_suspend_noirq(PMSG_FREEZE);
|
|
if (error) {
|
|
printk(KERN_ERR "PM: Some devices failed to power down, "
|
|
"aborting hibernation\n");
|
|
return error;
|
|
}
|
|
|
|
error = platform_pre_snapshot(platform_mode);
|
|
if (error || hibernation_test(TEST_PLATFORM))
|
|
goto Platform_finish;
|
|
|
|
error = disable_nonboot_cpus();
|
|
if (error || hibernation_test(TEST_CPUS)
|
|
|| hibernation_testmode(HIBERNATION_TEST))
|
|
goto Enable_cpus;
|
|
|
|
local_irq_disable();
|
|
|
|
error = sysdev_suspend(PMSG_FREEZE);
|
|
if (error) {
|
|
printk(KERN_ERR "PM: Some system devices failed to power down, "
|
|
"aborting hibernation\n");
|
|
goto Enable_irqs;
|
|
}
|
|
|
|
if (hibernation_test(TEST_CORE))
|
|
goto Power_up;
|
|
|
|
in_suspend = 1;
|
|
save_processor_state();
|
|
error = swsusp_arch_suspend();
|
|
if (error)
|
|
printk(KERN_ERR "PM: Error %d creating hibernation image\n",
|
|
error);
|
|
/* Restore control flow magically appears here */
|
|
restore_processor_state();
|
|
if (!in_suspend)
|
|
platform_leave(platform_mode);
|
|
|
|
Power_up:
|
|
sysdev_resume();
|
|
/* NOTE: dpm_resume_noirq() is just a resume() for devices
|
|
* that suspended with irqs off ... no overall powerup.
|
|
*/
|
|
|
|
Enable_irqs:
|
|
local_irq_enable();
|
|
|
|
Enable_cpus:
|
|
enable_nonboot_cpus();
|
|
|
|
Platform_finish:
|
|
platform_finish(platform_mode);
|
|
|
|
dpm_resume_noirq(in_suspend ?
|
|
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernation_snapshot - quiesce devices and create the hibernation
|
|
* snapshot image.
|
|
* @platform_mode - if set, use the platform driver, if available, to
|
|
* prepare the platform firmware for the power transition.
|
|
*
|
|
* Must be called with pm_mutex held
|
|
*/
|
|
|
|
int hibernation_snapshot(int platform_mode)
|
|
{
|
|
int error;
|
|
gfp_t saved_mask;
|
|
|
|
error = platform_begin(platform_mode);
|
|
if (error)
|
|
return error;
|
|
|
|
/* Preallocate image memory before shutting down devices. */
|
|
error = hibernate_preallocate_memory();
|
|
if (error)
|
|
goto Close;
|
|
|
|
suspend_console();
|
|
saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
|
|
error = dpm_suspend_start(PMSG_FREEZE);
|
|
if (error)
|
|
goto Recover_platform;
|
|
|
|
if (hibernation_test(TEST_DEVICES))
|
|
goto Recover_platform;
|
|
|
|
error = create_image(platform_mode);
|
|
/* Control returns here after successful restore */
|
|
|
|
Resume_devices:
|
|
/* We may need to release the preallocated image pages here. */
|
|
if (error || !in_suspend)
|
|
swsusp_free();
|
|
|
|
dpm_resume_end(in_suspend ?
|
|
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
|
|
set_gfp_allowed_mask(saved_mask);
|
|
resume_console();
|
|
Close:
|
|
platform_end(platform_mode);
|
|
return error;
|
|
|
|
Recover_platform:
|
|
platform_recover(platform_mode);
|
|
goto Resume_devices;
|
|
}
|
|
|
|
/**
|
|
* resume_target_kernel - prepare devices that need to be suspended with
|
|
* interrupts off, restore the contents of highmem that have not been
|
|
* restored yet from the image and run the low level code that will restore
|
|
* the remaining contents of memory and switch to the just restored target
|
|
* kernel.
|
|
*/
|
|
|
|
static int resume_target_kernel(bool platform_mode)
|
|
{
|
|
int error;
|
|
|
|
error = dpm_suspend_noirq(PMSG_QUIESCE);
|
|
if (error) {
|
|
printk(KERN_ERR "PM: Some devices failed to power down, "
|
|
"aborting resume\n");
|
|
return error;
|
|
}
|
|
|
|
error = platform_pre_restore(platform_mode);
|
|
if (error)
|
|
goto Cleanup;
|
|
|
|
error = disable_nonboot_cpus();
|
|
if (error)
|
|
goto Enable_cpus;
|
|
|
|
local_irq_disable();
|
|
|
|
error = sysdev_suspend(PMSG_QUIESCE);
|
|
if (error)
|
|
goto Enable_irqs;
|
|
|
|
/* We'll ignore saved state, but this gets preempt count (etc) right */
|
|
save_processor_state();
|
|
error = restore_highmem();
|
|
if (!error) {
|
|
error = swsusp_arch_resume();
|
|
/*
|
|
* The code below is only ever reached in case of a failure.
|
|
* Otherwise execution continues at place where
|
|
* swsusp_arch_suspend() was called
|
|
*/
|
|
BUG_ON(!error);
|
|
/* This call to restore_highmem() undos the previous one */
|
|
restore_highmem();
|
|
}
|
|
/*
|
|
* The only reason why swsusp_arch_resume() can fail is memory being
|
|
* very tight, so we have to free it as soon as we can to avoid
|
|
* subsequent failures
|
|
*/
|
|
swsusp_free();
|
|
restore_processor_state();
|
|
touch_softlockup_watchdog();
|
|
|
|
sysdev_resume();
|
|
|
|
Enable_irqs:
|
|
local_irq_enable();
|
|
|
|
Enable_cpus:
|
|
enable_nonboot_cpus();
|
|
|
|
Cleanup:
|
|
platform_restore_cleanup(platform_mode);
|
|
|
|
dpm_resume_noirq(PMSG_RECOVER);
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernation_restore - quiesce devices and restore the hibernation
|
|
* snapshot image. If successful, control returns in hibernation_snaphot()
|
|
* @platform_mode - if set, use the platform driver, if available, to
|
|
* prepare the platform firmware for the transition.
|
|
*
|
|
* Must be called with pm_mutex held
|
|
*/
|
|
|
|
int hibernation_restore(int platform_mode)
|
|
{
|
|
int error;
|
|
gfp_t saved_mask;
|
|
|
|
pm_prepare_console();
|
|
suspend_console();
|
|
saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
|
|
error = dpm_suspend_start(PMSG_QUIESCE);
|
|
if (!error) {
|
|
error = resume_target_kernel(platform_mode);
|
|
dpm_resume_end(PMSG_RECOVER);
|
|
}
|
|
set_gfp_allowed_mask(saved_mask);
|
|
resume_console();
|
|
pm_restore_console();
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernation_platform_enter - enter the hibernation state using the
|
|
* platform driver (if available)
|
|
*/
|
|
|
|
int hibernation_platform_enter(void)
|
|
{
|
|
int error;
|
|
gfp_t saved_mask;
|
|
|
|
if (!hibernation_ops)
|
|
return -ENOSYS;
|
|
|
|
/*
|
|
* We have cancelled the power transition by running
|
|
* hibernation_ops->finish() before saving the image, so we should let
|
|
* the firmware know that we're going to enter the sleep state after all
|
|
*/
|
|
error = hibernation_ops->begin();
|
|
if (error)
|
|
goto Close;
|
|
|
|
entering_platform_hibernation = true;
|
|
suspend_console();
|
|
saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
|
|
error = dpm_suspend_start(PMSG_HIBERNATE);
|
|
if (error) {
|
|
if (hibernation_ops->recover)
|
|
hibernation_ops->recover();
|
|
goto Resume_devices;
|
|
}
|
|
|
|
error = dpm_suspend_noirq(PMSG_HIBERNATE);
|
|
if (error)
|
|
goto Resume_devices;
|
|
|
|
error = hibernation_ops->prepare();
|
|
if (error)
|
|
goto Platform_finish;
|
|
|
|
error = disable_nonboot_cpus();
|
|
if (error)
|
|
goto Platform_finish;
|
|
|
|
local_irq_disable();
|
|
sysdev_suspend(PMSG_HIBERNATE);
|
|
hibernation_ops->enter();
|
|
/* We should never get here */
|
|
while (1);
|
|
|
|
/*
|
|
* We don't need to reenable the nonboot CPUs or resume consoles, since
|
|
* the system is going to be halted anyway.
|
|
*/
|
|
Platform_finish:
|
|
hibernation_ops->finish();
|
|
|
|
dpm_suspend_noirq(PMSG_RESTORE);
|
|
|
|
Resume_devices:
|
|
entering_platform_hibernation = false;
|
|
dpm_resume_end(PMSG_RESTORE);
|
|
set_gfp_allowed_mask(saved_mask);
|
|
resume_console();
|
|
|
|
Close:
|
|
hibernation_ops->end();
|
|
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* power_down - Shut the machine down for hibernation.
|
|
*
|
|
* Use the platform driver, if configured so; otherwise try
|
|
* to power off or reboot.
|
|
*/
|
|
|
|
static void power_down(void)
|
|
{
|
|
switch (hibernation_mode) {
|
|
case HIBERNATION_TEST:
|
|
case HIBERNATION_TESTPROC:
|
|
break;
|
|
case HIBERNATION_REBOOT:
|
|
kernel_restart(NULL);
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
hibernation_platform_enter();
|
|
case HIBERNATION_SHUTDOWN:
|
|
kernel_power_off();
|
|
break;
|
|
}
|
|
kernel_halt();
|
|
/*
|
|
* Valid image is on the disk, if we continue we risk serious data
|
|
* corruption after resume.
|
|
*/
|
|
printk(KERN_CRIT "PM: Please power down manually\n");
|
|
while(1);
|
|
}
|
|
|
|
static int prepare_processes(void)
|
|
{
|
|
int error = 0;
|
|
|
|
if (freeze_processes()) {
|
|
error = -EBUSY;
|
|
thaw_processes();
|
|
}
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* hibernate - The granpappy of the built-in hibernation management
|
|
*/
|
|
|
|
int hibernate(void)
|
|
{
|
|
int error;
|
|
|
|
mutex_lock(&pm_mutex);
|
|
/* The snapshot device should not be opened while we're running */
|
|
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
|
|
error = -EBUSY;
|
|
goto Unlock;
|
|
}
|
|
|
|
pm_prepare_console();
|
|
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
|
|
if (error)
|
|
goto Exit;
|
|
|
|
error = usermodehelper_disable();
|
|
if (error)
|
|
goto Exit;
|
|
|
|
/* Allocate memory management structures */
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto Exit;
|
|
|
|
printk(KERN_INFO "PM: Syncing filesystems ... ");
|
|
sys_sync();
|
|
printk("done.\n");
|
|
|
|
error = prepare_processes();
|
|
if (error)
|
|
goto Finish;
|
|
|
|
if (hibernation_test(TEST_FREEZER))
|
|
goto Thaw;
|
|
|
|
if (hibernation_testmode(HIBERNATION_TESTPROC))
|
|
goto Thaw;
|
|
|
|
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
|
|
if (error)
|
|
goto Thaw;
|
|
|
|
if (in_suspend) {
|
|
unsigned int flags = 0;
|
|
|
|
if (hibernation_mode == HIBERNATION_PLATFORM)
|
|
flags |= SF_PLATFORM_MODE;
|
|
pr_debug("PM: writing image.\n");
|
|
error = swsusp_write(flags);
|
|
swsusp_free();
|
|
if (!error)
|
|
power_down();
|
|
} else {
|
|
pr_debug("PM: Image restored successfully.\n");
|
|
}
|
|
|
|
Thaw:
|
|
thaw_processes();
|
|
Finish:
|
|
free_basic_memory_bitmaps();
|
|
usermodehelper_enable();
|
|
Exit:
|
|
pm_notifier_call_chain(PM_POST_HIBERNATION);
|
|
pm_restore_console();
|
|
atomic_inc(&snapshot_device_available);
|
|
Unlock:
|
|
mutex_unlock(&pm_mutex);
|
|
return error;
|
|
}
|
|
|
|
|
|
/**
|
|
* software_resume - Resume from a saved image.
|
|
*
|
|
* Called as a late_initcall (so all devices are discovered and
|
|
* initialized), we call swsusp to see if we have a saved image or not.
|
|
* If so, we quiesce devices, the restore the saved image. We will
|
|
* return above (in hibernate() ) if everything goes well.
|
|
* Otherwise, we fail gracefully and return to the normally
|
|
* scheduled program.
|
|
*
|
|
*/
|
|
|
|
static int software_resume(void)
|
|
{
|
|
int error;
|
|
unsigned int flags;
|
|
|
|
/*
|
|
* If the user said "noresume".. bail out early.
|
|
*/
|
|
if (noresume)
|
|
return 0;
|
|
|
|
/*
|
|
* name_to_dev_t() below takes a sysfs buffer mutex when sysfs
|
|
* is configured into the kernel. Since the regular hibernate
|
|
* trigger path is via sysfs which takes a buffer mutex before
|
|
* calling hibernate functions (which take pm_mutex) this can
|
|
* cause lockdep to complain about a possible ABBA deadlock
|
|
* which cannot happen since we're in the boot code here and
|
|
* sysfs can't be invoked yet. Therefore, we use a subclass
|
|
* here to avoid lockdep complaining.
|
|
*/
|
|
mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
|
|
|
|
if (swsusp_resume_device)
|
|
goto Check_image;
|
|
|
|
if (!strlen(resume_file)) {
|
|
error = -ENOENT;
|
|
goto Unlock;
|
|
}
|
|
|
|
pr_debug("PM: Checking image partition %s\n", resume_file);
|
|
|
|
/* Check if the device is there */
|
|
swsusp_resume_device = name_to_dev_t(resume_file);
|
|
if (!swsusp_resume_device) {
|
|
/*
|
|
* Some device discovery might still be in progress; we need
|
|
* to wait for this to finish.
|
|
*/
|
|
wait_for_device_probe();
|
|
/*
|
|
* We can't depend on SCSI devices being available after loading
|
|
* one of their modules until scsi_complete_async_scans() is
|
|
* called and the resume device usually is a SCSI one.
|
|
*/
|
|
scsi_complete_async_scans();
|
|
|
|
swsusp_resume_device = name_to_dev_t(resume_file);
|
|
if (!swsusp_resume_device) {
|
|
error = -ENODEV;
|
|
goto Unlock;
|
|
}
|
|
}
|
|
|
|
Check_image:
|
|
pr_debug("PM: Resume from partition %d:%d\n",
|
|
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
|
|
|
|
pr_debug("PM: Checking hibernation image.\n");
|
|
error = swsusp_check();
|
|
if (error)
|
|
goto Unlock;
|
|
|
|
/* The snapshot device should not be opened while we're running */
|
|
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
|
|
error = -EBUSY;
|
|
swsusp_close(FMODE_READ);
|
|
goto Unlock;
|
|
}
|
|
|
|
pm_prepare_console();
|
|
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
|
|
if (error)
|
|
goto close_finish;
|
|
|
|
error = usermodehelper_disable();
|
|
if (error)
|
|
goto close_finish;
|
|
|
|
error = create_basic_memory_bitmaps();
|
|
if (error)
|
|
goto close_finish;
|
|
|
|
pr_debug("PM: Preparing processes for restore.\n");
|
|
error = prepare_processes();
|
|
if (error) {
|
|
swsusp_close(FMODE_READ);
|
|
goto Done;
|
|
}
|
|
|
|
pr_debug("PM: Reading hibernation image.\n");
|
|
|
|
error = swsusp_read(&flags);
|
|
swsusp_close(FMODE_READ);
|
|
if (!error)
|
|
hibernation_restore(flags & SF_PLATFORM_MODE);
|
|
|
|
printk(KERN_ERR "PM: Restore failed, recovering.\n");
|
|
swsusp_free();
|
|
thaw_processes();
|
|
Done:
|
|
free_basic_memory_bitmaps();
|
|
usermodehelper_enable();
|
|
Finish:
|
|
pm_notifier_call_chain(PM_POST_RESTORE);
|
|
pm_restore_console();
|
|
atomic_inc(&snapshot_device_available);
|
|
/* For success case, the suspend path will release the lock */
|
|
Unlock:
|
|
mutex_unlock(&pm_mutex);
|
|
pr_debug("PM: Resume from disk failed.\n");
|
|
return error;
|
|
close_finish:
|
|
swsusp_close(FMODE_READ);
|
|
goto Finish;
|
|
}
|
|
|
|
late_initcall(software_resume);
|
|
|
|
|
|
static const char * const hibernation_modes[] = {
|
|
[HIBERNATION_PLATFORM] = "platform",
|
|
[HIBERNATION_SHUTDOWN] = "shutdown",
|
|
[HIBERNATION_REBOOT] = "reboot",
|
|
[HIBERNATION_TEST] = "test",
|
|
[HIBERNATION_TESTPROC] = "testproc",
|
|
};
|
|
|
|
/**
|
|
* disk - Control hibernation mode
|
|
*
|
|
* Suspend-to-disk can be handled in several ways. We have a few options
|
|
* for putting the system to sleep - using the platform driver (e.g. ACPI
|
|
* or other hibernation_ops), powering off the system or rebooting the
|
|
* system (for testing) as well as the two test modes.
|
|
*
|
|
* The system can support 'platform', and that is known a priori (and
|
|
* encoded by the presence of hibernation_ops). However, the user may
|
|
* choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
|
|
* test modes, 'test' or 'testproc'.
|
|
*
|
|
* show() will display what the mode is currently set to.
|
|
* store() will accept one of
|
|
*
|
|
* 'platform'
|
|
* 'shutdown'
|
|
* 'reboot'
|
|
* 'test'
|
|
* 'testproc'
|
|
*
|
|
* It will only change to 'platform' if the system
|
|
* supports it (as determined by having hibernation_ops).
|
|
*/
|
|
|
|
static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
int i;
|
|
char *start = buf;
|
|
|
|
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
|
|
if (!hibernation_modes[i])
|
|
continue;
|
|
switch (i) {
|
|
case HIBERNATION_SHUTDOWN:
|
|
case HIBERNATION_REBOOT:
|
|
case HIBERNATION_TEST:
|
|
case HIBERNATION_TESTPROC:
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
break;
|
|
/* not a valid mode, continue with loop */
|
|
continue;
|
|
}
|
|
if (i == hibernation_mode)
|
|
buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
|
|
else
|
|
buf += sprintf(buf, "%s ", hibernation_modes[i]);
|
|
}
|
|
buf += sprintf(buf, "\n");
|
|
return buf-start;
|
|
}
|
|
|
|
|
|
static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
int error = 0;
|
|
int i;
|
|
int len;
|
|
char *p;
|
|
int mode = HIBERNATION_INVALID;
|
|
|
|
p = memchr(buf, '\n', n);
|
|
len = p ? p - buf : n;
|
|
|
|
mutex_lock(&pm_mutex);
|
|
for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
|
|
if (len == strlen(hibernation_modes[i])
|
|
&& !strncmp(buf, hibernation_modes[i], len)) {
|
|
mode = i;
|
|
break;
|
|
}
|
|
}
|
|
if (mode != HIBERNATION_INVALID) {
|
|
switch (mode) {
|
|
case HIBERNATION_SHUTDOWN:
|
|
case HIBERNATION_REBOOT:
|
|
case HIBERNATION_TEST:
|
|
case HIBERNATION_TESTPROC:
|
|
hibernation_mode = mode;
|
|
break;
|
|
case HIBERNATION_PLATFORM:
|
|
if (hibernation_ops)
|
|
hibernation_mode = mode;
|
|
else
|
|
error = -EINVAL;
|
|
}
|
|
} else
|
|
error = -EINVAL;
|
|
|
|
if (!error)
|
|
pr_debug("PM: Hibernation mode set to '%s'\n",
|
|
hibernation_modes[mode]);
|
|
mutex_unlock(&pm_mutex);
|
|
return error ? error : n;
|
|
}
|
|
|
|
power_attr(disk);
|
|
|
|
static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
|
|
MINOR(swsusp_resume_device));
|
|
}
|
|
|
|
static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned int maj, min;
|
|
dev_t res;
|
|
int ret = -EINVAL;
|
|
|
|
if (sscanf(buf, "%u:%u", &maj, &min) != 2)
|
|
goto out;
|
|
|
|
res = MKDEV(maj,min);
|
|
if (maj != MAJOR(res) || min != MINOR(res))
|
|
goto out;
|
|
|
|
mutex_lock(&pm_mutex);
|
|
swsusp_resume_device = res;
|
|
mutex_unlock(&pm_mutex);
|
|
printk(KERN_INFO "PM: Starting manual resume from disk\n");
|
|
noresume = 0;
|
|
software_resume();
|
|
ret = n;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
power_attr(resume);
|
|
|
|
static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%lu\n", image_size);
|
|
}
|
|
|
|
static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
|
|
const char *buf, size_t n)
|
|
{
|
|
unsigned long size;
|
|
|
|
if (sscanf(buf, "%lu", &size) == 1) {
|
|
image_size = size;
|
|
return n;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
power_attr(image_size);
|
|
|
|
static struct attribute * g[] = {
|
|
&disk_attr.attr,
|
|
&resume_attr.attr,
|
|
&image_size_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
|
|
static struct attribute_group attr_group = {
|
|
.attrs = g,
|
|
};
|
|
|
|
|
|
static int __init pm_disk_init(void)
|
|
{
|
|
return sysfs_create_group(power_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 resume_offset_setup(char *str)
|
|
{
|
|
unsigned long long offset;
|
|
|
|
if (noresume)
|
|
return 1;
|
|
|
|
if (sscanf(str, "%llu", &offset) == 1)
|
|
swsusp_resume_block = offset;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __init noresume_setup(char *str)
|
|
{
|
|
noresume = 1;
|
|
return 1;
|
|
}
|
|
|
|
__setup("noresume", noresume_setup);
|
|
__setup("resume_offset=", resume_offset_setup);
|
|
__setup("resume=", resume_setup);
|