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())
hibernation_ops->restore_cleanup();
}
+/**
+ * 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.
+ */
+
+int create_image(int platform_mode)
+{
+ int error;
+
+ error = arch_prepare_suspend();
+ if (error)
+ return error;
+
+ local_irq_disable();
+ /* At this point, device_suspend() has been called, but *not*
+ * device_power_down(). We *must* call device_power_down() 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 = device_power_down(PMSG_FREEZE);
+ if (error) {
+ printk(KERN_ERR "Some devices failed to power down, "
+ KERN_ERR "aborting suspend\n");
+ goto Enable_irqs;
+ }
+
+ save_processor_state();
+ error = swsusp_arch_suspend();
+ if (error)
+ printk(KERN_ERR "Error %d while creating the image\n", error);
+ /* Restore control flow magically appears here */
+ restore_processor_state();
+ if (!in_suspend)
+ platform_leave(platform_mode);
+ /* NOTE: device_power_up() is just a resume() for devices
+ * that suspended with irqs off ... no overall powerup.
+ */
+ device_power_up();
+ Enable_irqs:
+ local_irq_enable();
+ return error;
+}
+
/**
* hibernation_snapshot - quiesce devices and create the hibernation
* snapshot image.
if (!error) {
if (hibernation_mode != HIBERNATION_TEST) {
in_suspend = 1;
- error = swsusp_suspend();
+ error = create_image(platform_mode);
/* Control returns here after successful restore */
} else {
printk("swsusp debug: Waiting for 5 seconds.\n");
{
int error;
- if (hibernation_ops) {
- kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
- /*
- * 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->prepare();
- sysdev_shutdown();
- if (!error)
- error = hibernation_ops->enter();
- } else {
- error = -ENOSYS;
+ 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->start();
+ if (error)
+ return error;
+
+ suspend_console();
+ error = device_suspend(PMSG_SUSPEND);
+ if (error)
+ goto Resume_console;
+
+ error = hibernation_ops->prepare();
+ if (error)
+ goto Resume_devices;
+
+ error = disable_nonboot_cpus();
+ if (error)
+ goto Finish;
+
+ local_irq_disable();
+ error = device_power_down(PMSG_SUSPEND);
+ if (!error) {
+ hibernation_ops->enter();
+ /* We should never get here */
+ while (1);
}
+ local_irq_enable();
+
+ /*
+ * 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();
+ Resume_console:
+ resume_console();
return error;
}
case HIBERNATION_TEST:
case HIBERNATION_TESTPROC:
break;
- case HIBERNATION_SHUTDOWN:
- kernel_power_off();
- break;
case HIBERNATION_REBOOT:
kernel_restart(NULL);
break;
case HIBERNATION_PLATFORM:
hibernation_platform_enter();
+ case HIBERNATION_SHUTDOWN:
+ kernel_power_off();
+ break;
}
kernel_halt();
/*
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);
* 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;
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;
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_kset->kobj, &attr_group);
}
core_initcall(pm_disk_init);
projects / linux-2.6-omap-h63xx.git / blobdiff