*
* 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.
*
*/
-#define DEBUG
-
-
#include <linux/suspend.h>
#include <linux/syscalls.h>
#include <linux/reboot.h>
#include <linux/string.h>
+#include <linux/device.h>
#include <linux/delay.h>
#include <linux/fs.h>
+#include <linux/mount.h>
+#include <linux/pm.h>
+#include <linux/console.h>
+#include <linux/cpu.h>
+#include <linux/freezer.h>
+
#include "power.h"
-extern u32 pm_disk_mode;
-extern struct pm_ops * pm_ops;
+static int noresume = 0;
+char resume_file[256] = CONFIG_PM_STD_PARTITION;
+dev_t swsusp_resume_device;
+sector_t swsusp_resume_block;
-extern int pmdisk_save(void);
-extern int pmdisk_write(void);
-extern int pmdisk_read(void);
-extern int pmdisk_restore(void);
-extern int pmdisk_free(void);
+/**
+ * platform_prepare - prepare the machine for hibernation using the
+ * platform driver if so configured and return an error code if it fails
+ */
+static inline int platform_prepare(void)
+{
+ int error = 0;
+
+ if (pm_disk_mode == PM_DISK_PLATFORM) {
+ if (pm_ops && pm_ops->prepare)
+ error = pm_ops->prepare(PM_SUSPEND_DISK);
+ }
+ return error;
+}
/**
* 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);
- device_power_down(PM_SUSPEND_DISK);
switch(mode) {
case PM_DISK_PLATFORM:
- error = pm_ops->enter(PM_SUSPEND_DISK);
- break;
+ if (pm_ops && pm_ops->enter) {
+ kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+ pm_ops->enter(PM_SUSPEND_DISK);
+ break;
+ }
case PM_DISK_SHUTDOWN:
- printk("Powering off system\n");
- machine_power_off();
+ kernel_power_off();
break;
case PM_DISK_REBOOT:
- machine_restart(NULL);
+ kernel_restart(NULL);
break;
}
- machine_halt();
- device_power_up();
- local_irq_restore(flags);
- return 0;
+ 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);
}
-
-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)
+static int prepare_processes(void)
{
- device_resume();
- platform_finish();
- thaw_processes();
- pm_restore_console();
-}
-
-
-static int prepare(void)
-{
- int error;
+ int error = 0;
pm_prepare_console();
- sys_sync();
+ error = disable_nonboot_cpus();
+ if (error)
+ goto enable_cpus;
+
if (freeze_processes()) {
error = -EBUSY;
- goto Thaw;
+ 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;
- }
+ if (pm_disk_mode == PM_DISK_TESTPROC) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto thaw;
}
- /* Free memory before shutting down devices. */
- free_some_memory();
+ error = platform_prepare();
+ if (error)
+ goto thaw;
- if ((error = device_suspend(PM_SUSPEND_DISK)))
- goto Finish;
+ /* Free memory before shutting down devices. */
+ if (!(error = swsusp_shrink_memory()))
+ return 0;
- return 0;
- Finish:
platform_finish();
- Thaw:
+ thaw:
thaw_processes();
+ enable_cpus:
+ 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.
+ * pm_suspend_disk - The granpappy of hibernation 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);
+ 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 = pmdisk_save()))
+ if ((error = swsusp_suspend()))
goto Done;
if (in_suspend) {
+ device_resume();
+ resume_console();
pr_debug("PM: writing image.\n");
-
- /*
- * FIXME: Leftover from swsusp. Are they necessary?
- */
- mb();
- barrier();
-
- error = pmdisk_write();
- if (!error) {
- error = power_down(pm_disk_mode);
- pr_debug("PM: Power down failed.\n");
+ error = swsusp_write();
+ if (!error)
+ power_down(pm_disk_mode);
+ else {
+ swsusp_free();
+ goto Thaw;
}
- } else
+ } else {
pr_debug("PM: Image restored successfully.\n");
- pmdisk_free();
+ }
+
+ swsusp_free();
Done:
- finish();
+ device_resume();
+ resume_console();
+ Thaw:
+ unprepare_processes();
return error;
}
/**
- * pm_resume - Resume from a saved image.
+ * 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
*
*/
-static int pm_resume(void)
+static int software_resume(void)
{
int error;
- pr_debug("PM: Reading pmdisk image.\n");
+ 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");
+
+ if ((error = swsusp_check()))
+ goto Done;
+
+ pr_debug("PM: Preparing processes for restore.\n");
- if ((error = pmdisk_read()))
+ if ((error = prepare_processes())) {
+ swsusp_close();
goto Done;
+ }
- pr_debug("PM: Preparing system for restore.\n");
+ pr_debug("PM: Reading swsusp image.\n");
- if ((error = prepare()))
- goto Free;
+ if ((error = swsusp_read())) {
+ swsusp_free();
+ goto Thaw;
+ }
- barrier();
- mb();
+ pr_debug("PM: Preparing devices for restore.\n");
- /* FIXME: The following (comment and mdelay()) are from swsusp.
- * Are they really necessary?
- *
- * We do not want some readahead with DMA to corrupt our memory, right?
- * Do it with disabled interrupts for best effect. That way, if some
- * driver scheduled DMA, we have good chance for DMA to finish ;-).
- */
- pr_debug("PM: Waiting for DMAs to settle down.\n");
- mdelay(1000);
+ suspend_console();
+ if ((error = device_suspend(PMSG_PRETHAW))) {
+ resume_console();
+ printk("Some devices failed to suspend\n");
+ swsusp_free();
+ goto Thaw;
+ }
+
+ mb();
pr_debug("PM: Restoring saved image.\n");
- pmdisk_restore();
+ swsusp_resume();
pr_debug("PM: Restore failed, recovering.n");
- finish();
- Free:
- pmdisk_free();
+ device_resume();
+ resume_console();
+ Thaw:
+ unprepare_processes();
Done:
+ /* For success case, the suspend path will release the lock */
+ mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
return 0;
}
-late_initcall(pm_resume);
+late_initcall(software_resume);
-static char * pm_disk_modes[] = {
+static const char * const pm_disk_modes[] = {
[PM_DISK_FIRMWARE] = "firmware",
[PM_DISK_PLATFORM] = "platform",
[PM_DISK_SHUTDOWN] = "shutdown",
[PM_DISK_REBOOT] = "reboot",
+ [PM_DISK_TEST] = "test",
+ [PM_DISK_TESTPROC] = "testproc",
};
/**
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;
- down(&pm_sem);
+ mutex_lock(&pm_mutex);
for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
if (!strncmp(buf, pm_disk_modes[i], len)) {
mode = i;
}
}
if (mode) {
- if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
+ if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
+ mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
pm_disk_mode = mode;
- else {
+ } else {
if (pm_ops && pm_ops->enter &&
(mode == pm_ops->pm_disk_mode))
pm_disk_mode = mode;
else
error = -EINVAL;
}
- } else
+ } else {
error = -EINVAL;
+ }
pr_debug("PM: suspend-to-disk mode set to '%s'\n",
pm_disk_modes[mode]);
- up(&pm_sem);
+ mutex_unlock(&pm_mutex);
return error ? error : 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;
+
+ mutex_lock(&pm_mutex);
+ swsusp_resume_device = res;
+ mutex_unlock(&pm_mutex);
+ 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,
};
}
core_initcall(pm_disk_init);
+
+
+static int __init resume_setup(char *str)
+{
+ if (noresume)
+ return 1;
+
+ strncpy( resume_file, str, 255 );
+ return 1;
+}
+
+static int __init resume_offset_setup(char *str)
+{
+ unsigned long long offset;
+
+ if (noresume)
+ return 1;
+
+ if (sscanf(str, "%llu", &offset) == 1)
+ swsusp_resume_block = offset;
+
+ return 1;
+}
+
+static int __init noresume_setup(char *str)
+{
+ noresume = 1;
+ return 1;
+}
+
+__setup("noresume", noresume_setup);
+__setup("resume_offset=", resume_offset_setup);
+__setup("resume=", resume_setup);
git://git.onelab.eu / linux-2.6.git / blobdiff