*
* Copyright (c) 2003 Patrick Mochel
* Copyright (c) 2003 Open Source Development Lab
+ * Copyright (c) 2004 Pavel Machek <pavel@suse.cz>
*
* This file is released under the GPLv2.
*
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
-#include "power.h"
-
-
-extern u32 pm_disk_mode;
-extern struct pm_ops * pm_ops;
+#include <linux/mount.h>
+#include <linux/pm.h>
-extern int swsusp_suspend(void);
-extern int swsusp_write(void);
-extern int swsusp_read(void);
-extern int swsusp_resume(void);
-extern int swsusp_free(void);
+#include "power.h"
static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
+dev_t swsusp_resume_device;
/**
* power_down - Shut machine down for hibernate.
* there ain't no turning back.
*/
-static int power_down(u32 mode)
+static void power_down(suspend_disk_method_t mode)
{
- unsigned long flags;
int error = 0;
- local_irq_save(flags);
switch(mode) {
case PM_DISK_PLATFORM:
- device_power_down(PM_SUSPEND_DISK);
+ kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
error = pm_ops->enter(PM_SUSPEND_DISK);
break;
case PM_DISK_SHUTDOWN:
- printk("Powering off system\n");
- device_shutdown();
- machine_power_off();
+ kernel_power_off();
break;
case PM_DISK_REBOOT:
- device_shutdown();
- machine_restart(NULL);
+ kernel_restart(NULL);
break;
}
- machine_halt();
+ kernel_halt();
/* 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");
while(1);
- return 0;
-}
-
-
-static int in_suspend __nosavedata = 0;
-
-
-/**
- * free_some_memory - Try to free as much memory as possible
- *
- * ... but do not OOM-kill anyone
- *
- * Notice: all userland should be stopped at this point, or
- * livelock is possible.
- */
-
-static void free_some_memory(void)
-{
- printk("Freeing memory: ");
- while (shrink_all_memory(10000))
- printk(".");
- printk("|\n");
}
-
static inline void platform_finish(void)
{
if (pm_disk_mode == PM_DISK_PLATFORM) {
}
}
-static void finish(void)
-{
- device_resume();
- platform_finish();
- enable_nonboot_cpus();
- thaw_processes();
- pm_restore_console();
-}
-
-
-static int prepare(void)
+static int prepare_processes(void)
{
int error;
pm_prepare_console();
+ disable_nonboot_cpus();
- sys_sync();
if (freeze_processes()) {
error = -EBUSY;
- goto Thaw;
- }
-
- if (pm_disk_mode == PM_DISK_PLATFORM) {
- if (pm_ops && pm_ops->prepare) {
- if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
- goto Thaw;
- }
+ goto thaw;
}
/* Free memory before shutting down devices. */
- free_some_memory();
-
- disable_nonboot_cpus();
- if ((error = device_suspend(PM_SUSPEND_DISK)))
- goto Finish;
-
- return 0;
- Finish:
- platform_finish();
- Thaw:
- enable_nonboot_cpus();
+ if (!(error = swsusp_shrink_memory()))
+ return 0;
+thaw:
thaw_processes();
+ enable_nonboot_cpus();
pm_restore_console();
return error;
}
+static void unprepare_processes(void)
+{
+ platform_finish();
+ thaw_processes();
+ enable_nonboot_cpus();
+ pm_restore_console();
+}
/**
* pm_suspend_disk - The granpappy of power management.
*
* If we're going through the firmware, then get it over with quickly.
*
- * If not, then call pmdis to do it's thing, then figure out how
+ * If not, then call swsusp to do its thing, then figure out how
* to power down the system.
*/
{
int error;
- if ((error = prepare()))
+ error = prepare_processes();
+ if (error)
return error;
- pr_debug("PM: Attempting to suspend to disk.\n");
- if (pm_disk_mode == PM_DISK_FIRMWARE)
- return pm_ops->enter(PM_SUSPEND_DISK);
+ 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;
goto Done;
if (in_suspend) {
+ device_resume();
pr_debug("PM: writing image.\n");
-
- /*
- * FIXME: Leftover from swsusp. Are they necessary?
- */
- mb();
- barrier();
-
error = swsusp_write();
- if (!error) {
- error = power_down(pm_disk_mode);
- pr_debug("PM: Power down failed.\n");
+ if (!error)
+ power_down(pm_disk_mode);
+ else {
+ swsusp_free();
+ unprepare_processes();
+ return error;
}
} else
pr_debug("PM: Image restored successfully.\n");
+
swsusp_free();
Done:
- finish();
+ device_resume();
+ unprepare_processes();
return error;
}
* software_resume - Resume from a saved image.
*
* Called as a late_initcall (so all devices are discovered and
- * initialized), we call pmdisk to see if we have a saved image or not.
+ * 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 pm_suspend_disk() ) if everything goes well.
* Otherwise, we fail gracefully and return to the normally
{
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: Reading pmdisk image.\n");
+ pr_debug("PM: Checking swsusp image.\n");
+
+ if ((error = swsusp_check()))
+ goto Done;
+
+ pr_debug("PM: Preparing processes for restore.\n");
- if ((error = swsusp_read()))
+ if ((error = prepare_processes())) {
+ swsusp_close();
goto Done;
+ }
+
+ pr_debug("PM: Reading swsusp image.\n");
+
+ if ((error = swsusp_read())) {
+ swsusp_free();
+ goto Thaw;
+ }
- pr_debug("PM: Preparing system for restore.\n");
+ pr_debug("PM: Preparing devices for restore.\n");
- if ((error = prepare()))
- goto Free;
+ if ((error = device_suspend(PMSG_FREEZE))) {
+ printk("Some devices failed to suspend\n");
+ swsusp_free();
+ goto Thaw;
+ }
- barrier();
mb();
pr_debug("PM: Restoring saved image.\n");
swsusp_resume();
pr_debug("PM: Restore failed, recovering.n");
- finish();
- Free:
- swsusp_free();
+ device_resume();
+ Thaw:
+ 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 ssize_t disk_show(struct subsystem * subsys, char * buf)
{
- return sprintf(buf,"%s\n",pm_disk_modes[pm_disk_mode]);
+ return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
}
int i;
int len;
char *p;
- u32 mode = 0;
+ suspend_disk_method_t mode = 0;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
power_attr(disk);
+static ssize_t resume_show(struct subsystem * subsys, char *buf)
+{
+ return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
+ MINOR(swsusp_resume_device));
+}
+
+static ssize_t resume_store(struct subsystem *subsys, 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;
+
+ down(&pm_sem);
+ swsusp_resume_device = res;
+ up(&pm_sem);
+ printk("Attempting manual resume\n");
+ noresume = 0;
+ software_resume();
+ ret = n;
+out:
+ return ret;
+}
+
+power_attr(resume);
+
+static ssize_t image_size_show(struct subsystem * subsys, char *buf)
+{
+ return sprintf(buf, "%lu\n", image_size);
+}
+
+static ssize_t image_size_store(struct subsystem * subsys, 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,
};
git://git.onelab.eu / linux-2.6.git / blobdiff