#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 suspend_disk_method_t pm_disk_mode;
-
-extern int swsusp_shrink_memory(void);
-extern int swsusp_suspend(void);
-extern int swsusp_write(struct pbe *pblist, unsigned int nr_pages);
-extern int swsusp_check(void);
-extern int swsusp_read(struct pbe **pblist_ptr);
-extern void swsusp_close(void);
-extern int swsusp_resume(void);
-
-
static int noresume = 0;
char resume_file[256] = CONFIG_PM_STD_PARTITION;
dev_t swsusp_resume_device;
+sector_t swsusp_resume_block;
+
+enum {
+ HIBERNATION_INVALID,
+ HIBERNATION_PLATFORM,
+ HIBERNATION_TEST,
+ HIBERNATION_TESTPROC,
+ HIBERNATION_SHUTDOWN,
+ HIBERNATION_REBOOT,
+ /* keep last */
+ __HIBERNATION_AFTER_LAST
+};
+#define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
+#define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
+
+static int hibernation_mode = HIBERNATION_SHUTDOWN;
+
+static struct hibernation_ops *hibernation_ops;
/**
- * power_down - Shut machine down for hibernate.
- * @mode: Suspend-to-disk mode
- *
- * Use the platform driver, if configured so, and return gracefully if it
- * fails.
- * Otherwise, try to power off and reboot. If they fail, halt the machine,
- * there ain't no turning back.
+ * hibernation_set_ops - set the global hibernate operations
+ * @ops: the hibernation operations to use in subsequent hibernation transitions
*/
-static void power_down(suspend_disk_method_t mode)
+void hibernation_set_ops(struct hibernation_ops *ops)
{
- int error = 0;
-
- switch(mode) {
- case PM_DISK_PLATFORM:
- kernel_power_off_prepare();
- error = pm_ops->enter(PM_SUSPEND_DISK);
- break;
- case PM_DISK_SHUTDOWN:
- kernel_power_off();
- break;
- case PM_DISK_REBOOT:
- kernel_restart(NULL);
- break;
+ if (ops && !(ops->prepare && ops->enter && ops->finish
+ && ops->pre_restore && ops->restore_cleanup)) {
+ WARN_ON(1);
+ return;
}
- 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);
+ mutex_lock(&pm_mutex);
+ hibernation_ops = ops;
+ if (ops)
+ hibernation_mode = HIBERNATION_PLATFORM;
+ else if (hibernation_mode == HIBERNATION_PLATFORM)
+ hibernation_mode = HIBERNATION_SHUTDOWN;
+
+ mutex_unlock(&pm_mutex);
+}
+
+
+/**
+ * platform_prepare - prepare the machine for hibernation using the
+ * platform driver if so configured and return an error code if it fails
+ */
+
+static int platform_prepare(int platform_mode)
+{
+ return (platform_mode && hibernation_ops) ?
+ hibernation_ops->prepare() : 0;
}
+/**
+ * platform_finish - switch the machine to the normal mode of operation
+ * using the platform driver (must be called after platform_prepare())
+ */
-static int in_suspend __nosavedata = 0;
+static void platform_finish(int platform_mode)
+{
+ if (platform_mode && hibernation_ops)
+ hibernation_ops->finish();
+}
+/**
+ * platform_pre_restore - prepare the platform for the restoration from a
+ * hibernation image. If the restore fails after this function has been
+ * called, platform_restore_cleanup() must be called.
+ */
-static inline void platform_finish(void)
+static int platform_pre_restore(int platform_mode)
{
- if (pm_disk_mode == PM_DISK_PLATFORM) {
- if (pm_ops && pm_ops->finish)
- pm_ops->finish(PM_SUSPEND_DISK);
- }
+ return (platform_mode && hibernation_ops) ?
+ hibernation_ops->pre_restore() : 0;
}
-static int prepare_processes(void)
+/**
+ * platform_restore_cleanup - switch the platform to the normal mode of
+ * operation after a failing restore. If platform_pre_restore() has been
+ * called before the failing restore, this function must be called too,
+ * regardless of the result of platform_pre_restore().
+ */
+
+static void platform_restore_cleanup(int platform_mode)
+{
+ if (platform_mode && hibernation_ops)
+ hibernation_ops->restore_cleanup();
+}
+
+/**
+ * hibernation_snapshot - quiesce devices and create the hibernation
+ * snapshot image.
+ * @platform_mode - if set, use the platform driver, if available, to
+ * prepare the platform frimware for the power transition.
+ *
+ * Must be called with pm_mutex held
+ */
+
+int hibernation_snapshot(int platform_mode)
{
int error;
- pm_prepare_console();
- sys_sync();
- disable_nonboot_cpus();
+ /* Free memory before shutting down devices. */
+ error = swsusp_shrink_memory();
+ if (error)
+ goto Finish;
- if (freeze_processes()) {
- error = -EBUSY;
- goto thaw;
- }
+ error = platform_prepare(platform_mode);
+ if (error)
+ goto Finish;
- if (pm_disk_mode == PM_DISK_PLATFORM) {
- if (pm_ops && pm_ops->prepare) {
- if ((error = pm_ops->prepare(PM_SUSPEND_DISK)))
- goto thaw;
+ suspend_console();
+ error = device_suspend(PMSG_FREEZE);
+ if (error)
+ goto Resume_devices;
+
+ error = disable_nonboot_cpus();
+ if (!error) {
+ if (hibernation_mode != HIBERNATION_TEST) {
+ in_suspend = 1;
+ error = swsusp_suspend();
+ /* Control returns here after successful restore */
+ } else {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
}
}
-
- /* Free memory before shutting down devices. */
- if (!(error = swsusp_shrink_memory()))
- return 0;
-thaw:
- thaw_processes();
enable_nonboot_cpus();
+ Resume_devices:
+ platform_finish(platform_mode);
+ device_resume();
+ resume_console();
+ Finish:
+ return error;
+}
+
+/**
+ * hibernation_restore - quiesce devices and restore the hibernation
+ * snapshot image. If successful, control returns in hibernation_snaphot()
+ * @platform_mode - if set, use the platform driver, if available, to
+ * prepare the platform frimware for the transition.
+ *
+ * Must be called with pm_mutex held
+ */
+
+int hibernation_restore(int platform_mode)
+{
+ int error;
+
+ pm_prepare_console();
+ suspend_console();
+ error = device_suspend(PMSG_PRETHAW);
+ if (error)
+ goto Finish;
+
+ error = platform_pre_restore(platform_mode);
+ if (!error) {
+ error = disable_nonboot_cpus();
+ if (!error)
+ error = swsusp_resume();
+ enable_nonboot_cpus();
+ }
+ platform_restore_cleanup(platform_mode);
+ Finish:
+ device_resume();
+ resume_console();
pm_restore_console();
return error;
}
+/**
+ * hibernation_platform_enter - enter the hibernation state using the
+ * platform driver (if available)
+ */
+
+int hibernation_platform_enter(void)
+{
+ if (hibernation_ops) {
+ kernel_shutdown_prepare(SYSTEM_SUSPEND_DISK);
+ return hibernation_ops->enter();
+ } else {
+ return -ENOSYS;
+ }
+}
+
+/**
+ * power_down - Shut the machine down for hibernation.
+ *
+ * Use the platform driver, if configured so; otherwise try
+ * to power off or reboot.
+ */
+
+static void power_down(void)
+{
+ switch (hibernation_mode) {
+ 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();
+ }
+ 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 void unprepare_processes(void)
{
- platform_finish();
thaw_processes();
- enable_nonboot_cpus();
pm_restore_console();
}
+static int prepare_processes(void)
+{
+ int error = 0;
+
+ pm_prepare_console();
+ if (freeze_processes()) {
+ error = -EBUSY;
+ unprepare_processes();
+ }
+ return error;
+}
+
/**
- * 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 swsusp to do its thing, then figure out how
- * to power down the system.
+ * hibernate - The granpappy of the built-in hibernation management
*/
-int pm_suspend_disk(void)
+int hibernate(void)
{
int error;
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0))
+ return -EBUSY;
+
+ /* Allocate memory management structures */
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Exit;
+
error = prepare_processes();
if (error)
- return error;
+ goto Finish;
- error = device_suspend(PMSG_FREEZE);
- if (error) {
- printk("Some devices failed to suspend\n");
- unprepare_processes();
- return error;
+ mutex_lock(&pm_mutex);
+ if (hibernation_mode == HIBERNATION_TESTPROC) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto Thaw;
}
+ error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
+ if (in_suspend && !error) {
+ unsigned int flags = 0;
- pr_debug("PM: snapshotting memory.\n");
- in_suspend = 1;
- if ((error = swsusp_suspend()))
- goto Done;
-
- if (in_suspend) {
- device_resume();
+ if (hibernation_mode == HIBERNATION_PLATFORM)
+ flags |= SF_PLATFORM_MODE;
pr_debug("PM: writing image.\n");
- error = swsusp_write(pagedir_nosave, nr_copy_pages);
+ error = swsusp_write(flags);
+ swsusp_free();
if (!error)
- power_down(pm_disk_mode);
- else {
- swsusp_free();
- unprepare_processes();
- return error;
- }
- } else
+ power_down();
+ } else {
pr_debug("PM: Image restored successfully.\n");
-
- swsusp_free();
- Done:
- device_resume();
+ swsusp_free();
+ }
+ Thaw:
+ mutex_unlock(&pm_mutex);
unprepare_processes();
+ Finish:
+ free_basic_memory_bitmaps();
+ Exit:
+ atomic_inc(&snapshot_device_available);
return error;
}
* Called as a late_initcall (so all devices are discovered and
* 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.
+ * return above (in hibernate() ) if everything goes well.
* Otherwise, we fail gracefully and return to the normally
* scheduled program.
*
static int software_resume(void)
{
int error;
+ unsigned int flags;
- down(&pm_sem);
+ mutex_lock(&pm_mutex);
if (!swsusp_resume_device) {
if (!strlen(resume_file)) {
- up(&pm_sem);
+ mutex_unlock(&pm_mutex);
return -ENOENT;
}
swsusp_resume_device = name_to_dev_t(resume_file);
* FIXME: If noresume is specified, we need to find the partition
* and reset it back to normal swap space.
*/
- up(&pm_sem);
+ mutex_unlock(&pm_mutex);
return 0;
}
pr_debug("PM: Checking swsusp image.\n");
+ error = swsusp_check();
+ if (error)
+ goto Unlock;
- if ((error = swsusp_check()))
- goto Done;
+ /* The snapshot device should not be opened while we're running */
+ if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
+ error = -EBUSY;
+ goto Unlock;
+ }
- pr_debug("PM: Preparing processes for restore.\n");
+ error = create_basic_memory_bitmaps();
+ if (error)
+ goto Finish;
- if ((error = prepare_processes())) {
+ pr_debug("PM: Preparing processes for restore.\n");
+ error = prepare_processes();
+ if (error) {
swsusp_close();
goto Done;
}
pr_debug("PM: Reading swsusp image.\n");
- if ((error = swsusp_read(&pagedir_nosave))) {
- swsusp_free();
- goto Thaw;
- }
-
- pr_debug("PM: Preparing devices for restore.\n");
+ error = swsusp_read(&flags);
+ if (!error)
+ hibernation_restore(flags & SF_PLATFORM_MODE);
- if ((error = device_suspend(PMSG_FREEZE))) {
- printk("Some devices failed to suspend\n");
- swsusp_free();
- goto Thaw;
- }
-
- mb();
-
- pr_debug("PM: Restoring saved image.\n");
- swsusp_resume();
- pr_debug("PM: Restore failed, recovering.n");
- device_resume();
- Thaw:
+ printk(KERN_ERR "PM: Restore failed, recovering.\n");
+ swsusp_free();
unprepare_processes();
Done:
+ free_basic_memory_bitmaps();
+ Finish:
+ atomic_inc(&snapshot_device_available);
/* For success case, the suspend path will release the lock */
- up(&pm_sem);
+ Unlock:
+ mutex_unlock(&pm_mutex);
pr_debug("PM: Resume from disk failed.\n");
- return 0;
+ return error;
}
late_initcall(software_resume);
-static char * pm_disk_modes[] = {
- [PM_DISK_FIRMWARE] = "firmware",
- [PM_DISK_PLATFORM] = "platform",
- [PM_DISK_SHUTDOWN] = "shutdown",
- [PM_DISK_REBOOT] = "reboot",
+static const char * const hibernation_modes[] = {
+ [HIBERNATION_PLATFORM] = "platform",
+ [HIBERNATION_SHUTDOWN] = "shutdown",
+ [HIBERNATION_REBOOT] = "reboot",
+ [HIBERNATION_TEST] = "test",
+ [HIBERNATION_TESTPROC] = "testproc",
};
/**
- * disk - Control suspend-to-disk mode
+ * disk - Control hibernation mode
*
- * Suspend-to-disk can be handled in several ways. The greatest
- * distinction is who writes memory to disk - the firmware or the OS.
- * If the firmware does it, we assume that it also handles suspending
- * the system.
- * If the OS does it, then we have three options for putting the system
- * to sleep - using the platform driver (e.g. ACPI or other PM registers),
- * powering off the system or rebooting the system (for testing).
+ * Suspend-to-disk can be handled in several ways. We have a few options
+ * for putting the system to sleep - using the platform driver (e.g. ACPI
+ * or other hibernation_ops), powering off the system or rebooting the
+ * system (for testing) as well as the two test modes.
*
- * The system will support either 'firmware' or 'platform', and that is
- * known a priori (and encoded in pm_ops). But, the user may choose
- * 'shutdown' or 'reboot' as alternatives.
+ * The system can support 'platform', and that is known a priori (and
+ * encoded by the presence of hibernation_ops). However, the user may
+ * choose 'shutdown' or 'reboot' as alternatives, as well as one fo the
+ * test modes, 'test' or 'testproc'.
*
* show() will display what the mode is currently set to.
* store() will accept one of
*
- * 'firmware'
* 'platform'
* 'shutdown'
* 'reboot'
+ * 'test'
+ * 'testproc'
*
- * It will only change to 'firmware' or 'platform' if the system
- * supports it (as determined from pm_ops->pm_disk_mode).
+ * It will only change to 'platform' if the system
+ * supports it (as determined by having hibernation_ops).
*/
-static ssize_t disk_show(struct subsystem * subsys, char * buf)
+static ssize_t disk_show(struct kset *kset, char *buf)
{
- return sprintf(buf, "%s\n", pm_disk_modes[pm_disk_mode]);
+ int i;
+ char *start = buf;
+
+ for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
+ if (!hibernation_modes[i])
+ continue;
+ switch (i) {
+ case HIBERNATION_SHUTDOWN:
+ case HIBERNATION_REBOOT:
+ case HIBERNATION_TEST:
+ case HIBERNATION_TESTPROC:
+ break;
+ case HIBERNATION_PLATFORM:
+ if (hibernation_ops)
+ break;
+ /* not a valid mode, continue with loop */
+ continue;
+ }
+ if (i == hibernation_mode)
+ buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
+ else
+ buf += sprintf(buf, "%s ", hibernation_modes[i]);
+ }
+ buf += sprintf(buf, "\n");
+ return buf-start;
}
-static ssize_t disk_store(struct subsystem * s, const char * buf, size_t n)
+static ssize_t disk_store(struct kset *kset, const char *buf, size_t n)
{
int error = 0;
int i;
int len;
char *p;
- suspend_disk_method_t mode = 0;
+ int mode = HIBERNATION_INVALID;
p = memchr(buf, '\n', n);
len = p ? p - buf : n;
- down(&pm_sem);
- for (i = PM_DISK_FIRMWARE; i < PM_DISK_MAX; i++) {
- if (!strncmp(buf, pm_disk_modes[i], len)) {
+ mutex_lock(&pm_mutex);
+ for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
+ if (len == strlen(hibernation_modes[i])
+ && !strncmp(buf, hibernation_modes[i], len)) {
mode = i;
break;
}
}
- if (mode) {
- if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
- pm_disk_mode = mode;
- else {
- if (pm_ops && pm_ops->enter &&
- (mode == pm_ops->pm_disk_mode))
- pm_disk_mode = mode;
+ if (mode != HIBERNATION_INVALID) {
+ switch (mode) {
+ case HIBERNATION_SHUTDOWN:
+ case HIBERNATION_REBOOT:
+ case HIBERNATION_TEST:
+ case HIBERNATION_TESTPROC:
+ hibernation_mode = mode;
+ break;
+ case HIBERNATION_PLATFORM:
+ if (hibernation_ops)
+ hibernation_mode = mode;
else
error = -EINVAL;
}
} else
error = -EINVAL;
- pr_debug("PM: suspend-to-disk mode set to '%s'\n",
- pm_disk_modes[mode]);
- up(&pm_sem);
+ if (!error)
+ pr_debug("PM: suspend-to-disk 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 subsystem * subsys, char *buf)
+static ssize_t resume_show(struct kset *kset, 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)
+static ssize_t resume_store(struct kset *kset, const char *buf, size_t n)
{
unsigned int maj, min;
dev_t res;
if (maj != MAJOR(res) || min != MINOR(res))
goto out;
- down(&pm_sem);
+ mutex_lock(&pm_mutex);
swsusp_resume_device = res;
- up(&pm_sem);
+ mutex_unlock(&pm_mutex);
printk("Attempting manual resume\n");
noresume = 0;
software_resume();
ret = n;
-out:
+ out:
return ret;
}
power_attr(resume);
-static ssize_t image_size_show(struct subsystem * subsys, char *buf)
+static ssize_t image_size_show(struct kset *kset, char *buf)
{
return sprintf(buf, "%lu\n", image_size);
}
-static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
+static ssize_t image_size_store(struct kset *kset, const char *buf, size_t n)
{
unsigned long size;
static int __init pm_disk_init(void)
{
- return sysfs_create_group(&power_subsys.kset.kobj,&attr_group);
+ return sysfs_create_group(&power_subsys.kobj, &attr_group);
}
core_initcall(pm_disk_init);
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;
}
__setup("noresume", noresume_setup);
+__setup("resume_offset=", resume_offset_setup);
__setup("resume=", resume_setup);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff