int pm_suspend_disk(void)
{
int error;
error = prepare_processes();
if (error)
return error;
if (pm_disk_mode == PM_DISK_TESTPROC)
return 0;
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error) {
resume_console();
printk("Some devices failed to suspend\n");
goto Thaw;
}
if (pm_disk_mode == PM_DISK_TEST) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
goto Done;
}
pr_debug("PM: snapshotting memory.\n");
in_suspend = 1;
if ((error = swsusp_suspend()))
goto Done;
if (in_suspend) {
device_resume();
resume_console();
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
power_down(pm_disk_mode);
else {
swsusp_free();
goto Thaw;
}
} else {
pr_debug("PM: Image restored successfully.\n");
}
swsusp_free();
Done:
device_resume();
resume_console();
Thaw:
unprepare_processes();
return error;
}
/**
* suspend_devices_and_enter - suspend devices and enter the desired system sleep
* state.
* @state: state to enter
*/
int suspend_devices_and_enter(suspend_state_t state)
{
int error;
if (!pm_ops)
return -ENOSYS;
if (pm_ops->set_target) {
error = pm_ops->set_target(state);
if (error)
return error;
}
suspend_console();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "Some devices failed to suspend\n");
goto Resume_console;
}
if (pm_ops->prepare) {
error = pm_ops->prepare(state);
if (error)
goto Resume_devices;
}
error = disable_nonboot_cpus();
if (!error)
suspend_enter(state);
enable_nonboot_cpus();
pm_finish(state);
Resume_devices:
device_resume();
Resume_console:
resume_console();
return error;
}
static inline int snapshot_restore(int platform_suspend)
{
int error;
mutex_lock(&pm_mutex);
pm_prepare_console();
if (platform_suspend) {
error = platform_prepare();
if (error)
goto Finish;
}
suspend_console();
error = device_suspend(PMSG_PRETHAW);
if (error)
goto Resume_devices;
error = disable_nonboot_cpus();
if (!error)
error = swsusp_resume();
enable_nonboot_cpus();
Resume_devices:
if (platform_suspend)
platform_finish();
device_resume();
resume_console();
Finish:
pm_restore_console();
mutex_unlock(&pm_mutex);
return error;
}
static void finish(void)
{
device_resume();
platform_finish();
thaw_processes();
pm_restore_console();
}
static void suspend_finish(u32 state)
{
device_resume();
if (pm_ops && pm_ops->finish)
pm_ops->finish(state);
thaw_processes();
pm_restore_console();
}
/**
* suspend_devices_and_enter - suspend devices and enter the desired system
* sleep state.
* @state: state to enter
*/
int suspend_devices_and_enter(suspend_state_t state)
{
int error, ftrace_save;
if (!suspend_ops)
return -ENOSYS;
if (suspend_ops->begin) {
error = suspend_ops->begin(state);
if (error)
goto Close;
}
suspend_console();
ftrace_save = __ftrace_enabled_save();
suspend_test_start();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Recover_platform;
}
suspend_test_finish("suspend devices");
if (suspend_test(TEST_DEVICES))
goto Recover_platform;
if (suspend_ops->prepare) {
error = suspend_ops->prepare();
if (error)
goto Resume_devices;
}
if (suspend_test(TEST_PLATFORM))
goto Finish;
error = disable_nonboot_cpus();
if (!error && !suspend_test(TEST_CPUS))
suspend_enter(state);
enable_nonboot_cpus();
Finish:
if (suspend_ops->finish)
suspend_ops->finish();
Resume_devices:
suspend_test_start();
device_resume(PMSG_RESUME);
suspend_test_finish("resume devices");
__ftrace_enabled_restore(ftrace_save);
resume_console();
Close:
if (suspend_ops->end)
suspend_ops->end();
return error;
Recover_platform:
if (suspend_ops->recover)
suspend_ops->recover();
goto Resume_devices;
}
static int suspend_save_image(void)
{
int error;
device_resume();
lock_swapdevices();
error = write_suspend_image();
lock_swapdevices();
return error;
}
static void suspend_finish(suspend_state_t state)
{
enable_nonboot_cpus();
pm_finish(state);
device_resume();
resume_console();
thaw_processes();
pm_restore_console();
}
static void suspend_finish(suspend_state_t state)
{
device_resume();
thaw_processes();
enable_nonboot_cpus();
if (pm_ops && pm_ops->finish)
pm_ops->finish(state);
pm_restore_console();
}
int hibernation_platform_enter(void)
{
int error;
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;
suspend_console();
error = device_suspend(PMSG_HIBERNATE);
if (error) {
if (hibernation_ops->recover)
hibernation_ops->recover();
goto Resume_devices;
}
error = hibernation_ops->prepare();
if (error)
goto Resume_devices;
error = disable_nonboot_cpus();
if (error)
goto Finish;
device_pm_lock();
local_irq_disable();
error = device_power_down(PMSG_HIBERNATE);
if (!error) {
hibernation_ops->enter();
/* We should never get here */
while (1);
}
local_irq_enable();
device_pm_unlock();
/*
* We don't need to reenable the nonboot CPUs or resume consoles, since
* the system is going to be halted anyway.
*/
Finish:
hibernation_ops->finish();
Resume_devices:
device_resume(PMSG_RESTORE);
resume_console();
Close:
hibernation_ops->end();
return error;
}
static void drivers_resume(int flags)
{
if (flags & RESUME_PHASE1) {
device_resume();
}
if (flags & RESUME_PHASE2) {
#ifdef SUSPEND_CONSOLE
update_screen(fg_console); /* Hmm, is this the problem? */
#endif
}
}
/* It is important _NOT_ to umount filesystems at this point. We want
* them synced (in case something goes wrong) but we DO not want to mark
* filesystem clean: it is not. (And it does not matter, if we resume
* correctly, we'll mark system clean, anyway.)
*/
int swsusp_write(void)
{
int error;
device_resume();
lock_swapdevices();
error = write_suspend_image();
/* This will unlock ignored swap devices since writing is finished */
lock_swapdevices();
return error;
}
int
device_resume_all(void)
{
int i;
int res = 0;
for (i=0; i<dev_ptr; i++) {
Serial1.print("Resuming "); Serial1.println(devices[i]->name);
res |= device_resume(devices[i]);
}
return res;
}
static INTERRUPT_GEN( blockade_interrupt )
{
blockade_state *state = device->machine().driver_data<blockade_state>();
device_resume(device, SUSPEND_ANY_REASON);
if ((state->ioport("IN0")->read() & 0x80) == 0)
{
state->m_just_been_reset = 1;
device_set_input_line(device, INPUT_LINE_RESET, PULSE_LINE);
}
}
static void resume_devices(int pm_policy)
{
int i;
for (i = device_count - 1; i >= 0; i--) {
if (!device_retval[i]) {
int idx = device_policy_list[i];
device_resume(&device_list[idx], pm_policy);
}
}
}
int hibernation_snapshot(int platform_mode)
{
int error;
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
return error;
error = platform_begin(platform_mode);
if (error)
goto Close;
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Recover_platform;
if (hibernation_test(TEST_DEVICES))
goto Recover_platform;
error = platform_pre_snapshot(platform_mode);
if (error || hibernation_test(TEST_PLATFORM))
goto Finish;
error = disable_nonboot_cpus();
if (!error) {
if (hibernation_test(TEST_CPUS))
goto Enable_cpus;
if (hibernation_testmode(HIBERNATION_TEST))
goto Enable_cpus;
error = create_image(platform_mode);
/* Control returns here after successful restore */
}
Enable_cpus:
enable_nonboot_cpus();
Finish:
platform_finish(platform_mode);
Resume_devices:
device_resume(in_suspend ?
(error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
resume_console();
Close:
platform_end(platform_mode);
return error;
Recover_platform:
platform_recover(platform_mode);
goto Resume_devices;
}
/*
* test_dev_suspend
* make test call to device_suspend and
* if that call is successful then make
* a call to device_resume
*/
static int test_dev_suspend() {
int error = 0;
error = device_suspend(SUSPEND_SAVE_STATE);
if (error)
printk("tbase: Failed on device suspend call\n");
else {
printk("tbase: Successful on device suspend call\n");
device_resume();
}
error = device_suspend(SUSPEND_DISABLE);
if (error)
printk("tbase: Failed on device suspend call\n");
else {
printk("tbase: Successful on device suspend call\n");
device_resume();
}
return error;
}
static int suspend_prepare(suspend_state_t state)
{
int error;
unsigned int free_pages;
if (!pm_ops || !pm_ops->enter)
return -EPERM;
pm_prepare_console();
if (freeze_processes()) {
error = -EAGAIN;
goto Thaw;
}
if ((free_pages = global_page_state(NR_FREE_PAGES))
< FREE_PAGE_NUMBER) {
pr_debug("PM: free some memory\n");
shrink_all_memory(FREE_PAGE_NUMBER - free_pages);
if (nr_free_pages() < FREE_PAGE_NUMBER) {
error = -ENOMEM;
printk(KERN_ERR "PM: No enough memory\n");
goto Thaw;
}
}
if (pm_ops->prepare) {
if ((error = pm_ops->prepare(state)))
goto Thaw;
}
suspend_console();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "Some devices failed to suspend\n");
goto Resume_devices;
}
error = disable_nonboot_cpus();
if (!error)
return 0;
enable_nonboot_cpus();
Resume_devices:
pm_finish(state);
device_resume();
resume_console();
Thaw:
thaw_processes();
pm_restore_console();
return error;
}
static void do_suspend(void)
{
int err;
int cancelled = 1;
shutting_down = SHUTDOWN_SUSPEND;
#ifdef CONFIG_PREEMPT
/* If the kernel is preemptible, we need to freeze all the processes
to prevent them from being in the middle of a pagetable update
during suspend. */
err = freeze_processes();
if (err) {
printk(KERN_ERR "xen suspend: freeze failed %d\n", err);
return;
}
#endif
err = device_suspend(PMSG_SUSPEND);
if (err) {
printk(KERN_ERR "xen suspend: device_suspend %d\n", err);
goto out;
}
printk("suspending xenbus...\n");
/* XXX use normal device tree? */
xenbus_suspend();
err = stop_machine(xen_suspend, &cancelled, &cpumask_of_cpu(0));
if (err) {
printk(KERN_ERR "failed to start xen_suspend: %d\n", err);
goto out;
}
if (!cancelled) {
xen_arch_resume();
xenbus_resume();
} else
xenbus_suspend_cancel();
device_resume(PMSG_RESUME);
/* Make sure timer events get retriggered on all CPUs */
clock_was_set();
out:
#ifdef CONFIG_PREEMPT
thaw_processes();
#endif
shutting_down = SHUTDOWN_INVALID;
}
static void IntReq( running_machine &machine, int num )
{
crystal_state *state = machine.driver_data<crystal_state>();
address_space *space = state->m_maincpu->memory().space(AS_PROGRAM);
UINT32 IntEn = space->read_dword(0x01800c08);
UINT32 IntPend = space->read_dword(0x01800c0c);
if (IntEn & (1 << num))
{
IntPend |= (1 << num);
space->write_dword(0x01800c0c, IntPend);
device_set_input_line(state->m_maincpu, SE3208_INT, ASSERT_LINE);
}
#ifdef IDLE_LOOP_SPEEDUP
state->m_FlipCntRead = 0;
device_resume(state->m_maincpu, SUSPEND_REASON_SPIN);
#endif
}
int hibernation_snapshot(int platform_mode)
{
int error;
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
return error;
error = platform_start(platform_mode);
if (error)
return error;
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Resume_console;
error = platform_pre_snapshot(platform_mode);
if (error)
goto Resume_devices;
error = disable_nonboot_cpus();
if (!error) {
if (hibernation_mode != HIBERNATION_TEST) {
in_suspend = 1;
error = create_image(platform_mode);
/* Control returns here after successful restore */
} else {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
}
}
enable_nonboot_cpus();
Resume_devices:
platform_finish(platform_mode);
device_resume();
Resume_console:
resume_console();
return error;
}
int pm_suspend_disk(void)
{
int error;
error = prepare_processes();
if (error)
return error;
error = device_suspend(PMSG_FREEZE);
if (error) {
printk("Some devices failed to suspend\n");
unprepare_processes();
return error;
}
pr_debug("PM: snapshotting memory.\n");
in_suspend = 1;
if ((error = swsusp_suspend()))
goto Done;
if (in_suspend) {
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
power_down(pm_disk_mode);
else {
/* swsusp_write can not fail in device_resume,
no need to do second device_resume */
swsusp_free();
unprepare_processes();
return error;
}
} else
pr_debug("PM: Image restored successfully.\n");
swsusp_free();
Done:
device_resume();
unprepare_processes();
return error;
}
/**
* suspend_devices_and_enter - suspend devices and enter the desired system
* sleep state.
* @state: state to enter
*/
int suspend_devices_and_enter(suspend_state_t state)
{
int error;
if (!suspend_ops)
return -ENOSYS;
if (suspend_ops->begin) {
error = suspend_ops->begin(state);
if (error)
goto Close;
}
suspend_console();
suspend_test_start();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Recover_platform;
}
suspend_test_finish("suspend devices");
if (suspend_test(TEST_DEVICES))
goto Recover_platform;
suspend_enter(state);
Resume_devices:
suspend_test_start();
device_resume(PMSG_RESUME);
suspend_test_finish("resume devices");
resume_console();
Close:
if (suspend_ops->end)
suspend_ops->end();
return error;
Recover_platform:
if (suspend_ops->recover)
suspend_ops->recover();
goto Resume_devices;
}
int hibernation_restore(int platform_mode)
{
int error;
pm_prepare_console();
suspend_console();
error = device_suspend(PMSG_PRETHAW);
if (error)
goto Finish;
error = platform_pre_restore(platform_mode);
if (!error) {
error = disable_nonboot_cpus();
if (!error)
error = swsusp_resume();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
device_resume();
Finish:
resume_console();
pm_restore_console();
return error;
}
int hibernation_restore(int platform_mode)
{
int error;
pm_prepare_console();
suspend_console();
error = device_suspend(PMSG_QUIESCE);
if (error)
goto Finish;
error = platform_pre_restore(platform_mode);
if (!error) {
error = disable_nonboot_cpus();
if (!error)
error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
device_resume(PMSG_RECOVER);
Finish:
resume_console();
pm_restore_console();
return error;
}
static inline int snapshot_suspend(int platform_suspend)
{
int error;
mutex_lock(&pm_mutex);
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
goto Finish;
if (platform_suspend) {
error = platform_prepare();
if (error)
goto Finish;
}
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error)
goto Resume_devices;
error = disable_nonboot_cpus();
if (!error) {
in_suspend = 1;
error = swsusp_suspend();
}
enable_nonboot_cpus();
Resume_devices:
if (platform_suspend)
platform_finish();
device_resume();
resume_console();
Finish:
mutex_unlock(&pm_mutex);
return error;
}
int pm_suspend_disk(void)
{
int error;
error = prepare_processes();
if (error)
return error;
if (pm_disk_mode == PM_DISK_TESTPROC) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
goto Thaw;
}
/* Allocate memory management structures */
error = create_basic_memory_bitmaps();
if (error)
goto Thaw;
/* Free memory before shutting down devices. */
error = swsusp_shrink_memory();
if (error)
goto Finish;
error = platform_prepare();
if (error)
goto Finish;
suspend_console();
error = device_suspend(PMSG_FREEZE);
if (error) {
printk(KERN_ERR "PM: Some devices failed to suspend\n");
goto Resume_devices;
}
error = disable_nonboot_cpus();
if (error)
goto Enable_cpus;
if (pm_disk_mode == PM_DISK_TEST) {
printk("swsusp debug: Waiting for 5 seconds.\n");
mdelay(5000);
goto Enable_cpus;
}
pr_debug("PM: snapshotting memory.\n");
in_suspend = 1;
error = swsusp_suspend();
if (error)
goto Enable_cpus;
if (in_suspend) {
enable_nonboot_cpus();
platform_finish();
device_resume();
resume_console();
pr_debug("PM: writing image.\n");
error = swsusp_write();
if (!error)
power_down(pm_disk_mode);
else {
swsusp_free();
goto Finish;
}
} else {
pr_debug("PM: Image restored successfully.\n");
}
swsusp_free();
Enable_cpus:
enable_nonboot_cpus();
Resume_devices:
platform_finish();
device_resume();
resume_console();
Finish:
free_basic_memory_bitmaps();
Thaw:
unprepare_processes();
return error;
}
static int software_resume(void)
{
int error;
down(&pm_sem);
if (!swsusp_resume_device) {
if (!strlen(resume_file)) {
up(&pm_sem);
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
pr_debug("swsusp: Resume From Partition %s\n", resume_file);
} else {
pr_debug("swsusp: Resume From Partition %d:%d\n",
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
}
if (noresume) {
/**
* FIXME: If noresume is specified, we need to find the partition
* and reset it back to normal swap space.
*/
up(&pm_sem);
return 0;
}
pr_debug("PM: Checking swsusp image.\n");
if ((error = swsusp_check()))
goto Done;
pr_debug("PM: Preparing processes for restore.\n");
if ((error = prepare_processes())) {
swsusp_close();
goto Done;
}
pr_debug("PM: Reading swsusp image.\n");
if ((error = swsusp_read()))
goto Cleanup;
pr_debug("PM: Preparing devices for restore.\n");
if ((error = device_suspend(PMSG_FREEZE))) {
printk("Some devices failed to suspend\n");
goto Free;
}
mb();
pr_debug("PM: Restoring saved image.\n");
swsusp_resume();
pr_debug("PM: Restore failed, recovering.n");
device_resume();
Free:
swsusp_free();
Cleanup:
unprepare_processes();
Done:
/* For success case, the suspend path will release the lock */
up(&pm_sem);
pr_debug("PM: Resume from disk failed.\n");
return 0;
}
static int snapshot_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
int error = 0;
struct snapshot_data *data;
loff_t avail;
sector_t offset;
if (_IOC_TYPE(cmd) != SNAPSHOT_IOC_MAGIC)
return -ENOTTY;
if (_IOC_NR(cmd) > SNAPSHOT_IOC_MAXNR)
return -ENOTTY;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
data = filp->private_data;
switch (cmd) {
case SNAPSHOT_FREEZE:
if (data->frozen)
break;
mutex_lock(&pm_mutex);
if (freeze_processes()) {
thaw_processes();
error = -EBUSY;
}
mutex_unlock(&pm_mutex);
if (!error)
data->frozen = 1;
break;
case SNAPSHOT_UNFREEZE:
if (!data->frozen || data->ready)
break;
mutex_lock(&pm_mutex);
thaw_processes();
mutex_unlock(&pm_mutex);
data->frozen = 0;
break;
case SNAPSHOT_ATOMIC_SNAPSHOT:
if (data->mode != O_RDONLY || !data->frozen || data->ready) {
error = -EPERM;
break;
}
error = snapshot_suspend(data->platform_suspend);
if (!error)
error = put_user(in_suspend, (unsigned int __user *)arg);
if (!error)
data->ready = 1;
break;
case SNAPSHOT_ATOMIC_RESTORE:
snapshot_write_finalize(&data->handle);
if (data->mode != O_WRONLY || !data->frozen ||
!snapshot_image_loaded(&data->handle)) {
error = -EPERM;
break;
}
error = snapshot_restore(data->platform_suspend);
break;
case SNAPSHOT_FREE:
swsusp_free();
memset(&data->handle, 0, sizeof(struct snapshot_handle));
data->ready = 0;
break;
case SNAPSHOT_SET_IMAGE_SIZE:
image_size = arg;
break;
case SNAPSHOT_AVAIL_SWAP:
avail = count_swap_pages(data->swap, 1);
avail <<= PAGE_SHIFT;
error = put_user(avail, (loff_t __user *)arg);
break;
case SNAPSHOT_GET_SWAP_PAGE:
if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
error = -ENODEV;
break;
}
offset = alloc_swapdev_block(data->swap);
if (offset) {
offset <<= PAGE_SHIFT;
error = put_user(offset, (sector_t __user *)arg);
} else {
error = -ENOSPC;
}
break;
case SNAPSHOT_FREE_SWAP_PAGES:
if (data->swap < 0 || data->swap >= MAX_SWAPFILES) {
error = -ENODEV;
break;
}
free_all_swap_pages(data->swap);
break;
case SNAPSHOT_SET_SWAP_FILE:
if (!swsusp_swap_in_use()) {
/*
* User space encodes device types as two-byte values,
* so we need to recode them
*/
if (old_decode_dev(arg)) {
data->swap = swap_type_of(old_decode_dev(arg),
0, NULL);
if (data->swap < 0)
error = -ENODEV;
} else {
data->swap = -1;
error = -EINVAL;
}
} else {
error = -EPERM;
}
break;
case SNAPSHOT_S2RAM:
if (!pm_ops) {
error = -ENOSYS;
break;
}
if (!data->frozen) {
error = -EPERM;
break;
}
if (!mutex_trylock(&pm_mutex)) {
error = -EBUSY;
break;
}
if (pm_ops->prepare) {
error = pm_ops->prepare(PM_SUSPEND_MEM);
if (error)
goto OutS3;
}
/* Put devices to sleep */
suspend_console();
error = device_suspend(PMSG_SUSPEND);
if (error) {
printk(KERN_ERR "Failed to suspend some devices.\n");
} else {
error = disable_nonboot_cpus();
if (!error) {
/* Enter S3, system is already frozen */
suspend_enter(PM_SUSPEND_MEM);
enable_nonboot_cpus();
}
/* Wake up devices */
device_resume();
}
resume_console();
if (pm_ops->finish)
pm_ops->finish(PM_SUSPEND_MEM);
OutS3:
mutex_unlock(&pm_mutex);
break;
case SNAPSHOT_PMOPS:
error = -EINVAL;
switch (arg) {
case PMOPS_PREPARE:
if (hibernation_ops) {
data->platform_suspend = 1;
error = 0;
} else {
error = -ENOSYS;
}
break;
case PMOPS_ENTER:
if (data->platform_suspend) {
kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
error = hibernation_ops->enter();
}
break;
case PMOPS_FINISH:
if (data->platform_suspend)
error = 0;
break;
default:
printk(KERN_ERR "SNAPSHOT_PMOPS: invalid argument %ld\n", arg);
}
break;
case SNAPSHOT_SET_SWAP_AREA:
if (swsusp_swap_in_use()) {
error = -EPERM;
} else {
struct resume_swap_area swap_area;
dev_t swdev;
error = copy_from_user(&swap_area, (void __user *)arg,
sizeof(struct resume_swap_area));
if (error) {
error = -EFAULT;
break;
}
/*
* User space encodes device types as two-byte values,
* so we need to recode them
*/
swdev = old_decode_dev(swap_area.dev);
if (swdev) {
offset = swap_area.offset;
data->swap = swap_type_of(swdev, offset, NULL);
if (data->swap < 0)
error = -ENODEV;
} else {
data->swap = -1;
error = -EINVAL;
}
}
break;
default:
error = -ENOTTY;
}
return error;
}
static int software_resume(void)
{
int error;
mutex_lock(&pm_mutex);
if (!swsusp_resume_device) {
if (!strlen(resume_file)) {
mutex_unlock(&pm_mutex);
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
pr_debug("swsusp: Resume From Partition %s\n", resume_file);
} else {
pr_debug("swsusp: Resume From Partition %d:%d\n",
MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
}
if (noresume) {
/**
* FIXME: If noresume is specified, we need to find the partition
* and reset it back to normal swap space.
*/
mutex_unlock(&pm_mutex);
return 0;
}
pr_debug("PM: Checking swsusp image.\n");
error = swsusp_check();
if (error)
goto Unlock;
error = create_basic_memory_bitmaps();
if (error)
goto Unlock;
pr_debug("PM: Preparing processes for restore.\n");
error = prepare_processes();
if (error) {
swsusp_close();
goto Done;
}
pr_debug("PM: Reading swsusp image.\n");
error = swsusp_read();
if (error) {
swsusp_free();
goto Thaw;
}
pr_debug("PM: Preparing devices for restore.\n");
suspend_console();
error = device_suspend(PMSG_PRETHAW);
if (error)
goto Free;
error = disable_nonboot_cpus();
if (!error)
swsusp_resume();
enable_nonboot_cpus();
Free:
swsusp_free();
device_resume();
resume_console();
Thaw:
printk(KERN_ERR "PM: Restore failed, recovering.\n");
unprepare_processes();
Done:
free_basic_memory_bitmaps();
/* For success case, the suspend path will release the lock */
Unlock:
mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
return 0;
}