void hibernation_set_ops(struct platform_hibernation_ops *ops)
{
- if (ops && !(ops->start && ops->pre_snapshot && ops->finish
- && ops->prepare && ops->enter && ops->pre_restore
+ 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;
#endif /* !CONFIG_PM_DEBUG */
/**
- * platform_start - tell the platform driver that we're starting
+ * platform_begin - tell the platform driver that we're starting
* hibernation
*/
-static int platform_start(int platform_mode)
+static int platform_begin(int platform_mode)
{
return (platform_mode && hibernation_ops) ?
- hibernation_ops->start() : 0;
+ 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();
}
/**
*/
error = device_power_down(PMSG_FREEZE);
if (error) {
- printk(KERN_ERR "Some devices failed to power down, "
- KERN_ERR "aborting suspend\n");
+ printk(KERN_ERR "PM: Some devices failed to power down, "
+ "aborting hibernation\n");
goto Enable_irqs;
}
save_processor_state();
error = swsusp_arch_suspend();
if (error)
- printk(KERN_ERR "Error %d while creating the image\n", error);
+ printk(KERN_ERR "PM: Error %d creating hibernation image\n",
+ error);
/* Restore control flow magically appears here */
restore_processor_state();
if (!in_suspend)
if (error)
return error;
- error = platform_start(platform_mode);
+ error = platform_begin(platform_mode);
if (error)
- return error;
+ goto Close;
suspend_console();
error = device_suspend(PMSG_FREEZE);
device_resume();
Resume_console:
resume_console();
+ Close:
+ platform_end(platform_mode);
+ return error;
+}
+
+/**
+ * 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(void)
+{
+ int error;
+
+ local_irq_disable();
+ error = device_power_down(PMSG_PRETHAW);
+ if (error) {
+ printk(KERN_ERR "PM: Some devices failed to power down, "
+ "aborting resume\n");
+ 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();
+ device_power_up();
+ Enable_irqs:
+ local_irq_enable();
return error;
}
if (!error) {
error = disable_nonboot_cpus();
if (!error)
- error = swsusp_resume();
+ error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
* 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->start();
+ error = hibernation_ops->begin();
if (error)
- return error;
+ goto Close;
suspend_console();
error = device_suspend(PMSG_SUSPEND);
device_resume();
Resume_console:
resume_console();
+ Close:
+ hibernation_ops->end();
return error;
}
* Valid image is on the disk, if we continue we risk serious data
* corruption after resume.
*/
- printk(KERN_CRIT "Please power me down manually\n");
+ printk(KERN_CRIT "PM: Please power down manually\n");
while(1);
}
-static void unprepare_processes(void)
-{
- thaw_processes();
- pm_restore_console();
-}
-
static int prepare_processes(void)
{
int error = 0;
- pm_prepare_console();
if (freeze_processes()) {
error = -EBUSY;
- unprepare_processes();
+ thaw_processes();
}
return error;
}
goto Unlock;
}
+ pm_prepare_console();
error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
if (error)
goto Exit;
if (error)
goto Exit;
- printk("Syncing filesystems ... ");
+ printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
swsusp_free();
}
Thaw:
- unprepare_processes();
+ thaw_processes();
Finish:
free_basic_memory_bitmaps();
Exit:
pm_notifier_call_chain(PM_POST_HIBERNATION);
+ pm_restore_console();
atomic_inc(&snapshot_device_available);
Unlock:
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);
+ pr_debug("PM: 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));
+ pr_debug("PM: 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.
+ * 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");
+ pr_debug("PM: Checking hibernation image.\n");
error = swsusp_check();
if (error)
goto Unlock;
goto Unlock;
}
+ pm_prepare_console();
error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
if (error)
goto Finish;
goto Done;
}
- pr_debug("PM: Reading swsusp image.\n");
+ pr_debug("PM: Reading hibernation image.\n");
error = swsusp_read(&flags);
if (!error)
printk(KERN_ERR "PM: Restore failed, recovering.\n");
swsusp_free();
- unprepare_processes();
+ thaw_processes();
Done:
free_basic_memory_bitmaps();
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:
error = -EINVAL;
if (!error)
- pr_debug("PM: suspend-to-disk mode set to '%s'\n",
+ pr_debug("PM: Hibernation mode set to '%s'\n",
hibernation_modes[mode]);
mutex_unlock(&pm_mutex);
return error ? error : n;
mutex_lock(&pm_mutex);
swsusp_resume_device = res;
mutex_unlock(&pm_mutex);
- printk("Attempting manual resume\n");
+ printk(KERN_INFO "PM: Starting manual resume from disk\n");
noresume = 0;
software_resume();
ret = n;
projects / linux-2.6 / blobdiff