mutex_unlock(&pm_mutex);
}
+#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_start - tell the platform driver that we're starting
* hibernation
*/
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;
}
+ if (hibernation_test(TEST_CORE))
+ goto Power_up;
+
+ in_suspend = 1;
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)
platform_leave(platform_mode);
+ Power_up:
/* NOTE: device_power_up() is just a resume() for devices
* that suspended with irqs off ... no overall powerup.
*/
if (error)
goto Resume_console;
- error = platform_pre_snapshot(platform_mode);
- if (error)
+ if (hibernation_test(TEST_DEVICES))
goto Resume_devices;
+ error = platform_pre_snapshot(platform_mode);
+ if (error || hibernation_test(TEST_PLATFORM))
+ goto Finish;
+
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);
- }
+ 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();
- Resume_devices:
+ Finish:
platform_finish(platform_mode);
+ Resume_devices:
device_resume();
Resume_console:
resume_console();
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;
+}
+
/**
* hibernation_restore - quiesce devices and restore the hibernation
* snapshot image. If successful, control returns in hibernation_snaphot()
if (!error) {
error = disable_nonboot_cpus();
if (!error)
- error = swsusp_resume();
+ error = resume_target_kernel();
enable_nonboot_cpus();
}
platform_restore_cleanup(platform_mode);
* 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);
}
if (error)
goto Exit;
- printk("Syncing filesystems ... ");
+ printk(KERN_INFO "PM: Syncing filesystems ... ");
sys_sync();
printk("done.\n");
if (error)
goto Finish;
- if (hibernation_mode == HIBERNATION_TESTPROC) {
- printk("swsusp debug: Waiting for 5 seconds.\n");
- mdelay(5000);
+ if (hibernation_test(TEST_FREEZER))
goto Thaw;
- }
+
+ if (hibernation_testmode(HIBERNATION_TESTPROC))
+ goto Thaw;
+
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (in_suspend && !error) {
unsigned int flags = 0;
int error;
unsigned int flags;
- mutex_lock(&pm_mutex);
+ /*
+ * 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) {
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);
+ 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;
}
+ error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
+ if (error)
+ goto Finish;
+
error = create_basic_memory_bitmaps();
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)
Done:
free_basic_memory_bitmaps();
Finish:
+ pm_notifier_call_chain(PM_POST_RESTORE);
atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
Unlock:
* supports it (as determined by having hibernation_ops).
*/
-static ssize_t disk_show(struct kset *kset, char *buf)
+static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
+ char *buf)
{
int i;
char *start = buf;
}
-static ssize_t disk_store(struct kset *kset, const char *buf, size_t n)
+static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
{
int error = 0;
int i;
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;
power_attr(disk);
-static ssize_t resume_show(struct kset *kset, char *buf)
+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 kset *kset, const char *buf, size_t n)
+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;
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;
power_attr(resume);
-static ssize_t image_size_show(struct kset *kset, char *buf)
+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 kset *kset, const char *buf, size_t n)
+static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
+ const char *buf, size_t n)
{
unsigned long size;
static int __init pm_disk_init(void)
{
- return sysfs_create_group(&power_subsys.kobj, &attr_group);
+ return sysfs_create_group(power_kobj, &attr_group);
}
core_initcall(pm_disk_init);
projects / linux-2.6-omap-h63xx.git / blobdiff