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-rw-r--r--kernel/power/disk.c56
-rw-r--r--kernel/power/power.h13
-rw-r--r--kernel/power/swap.c20
-rw-r--r--kernel/power/user.c2
4 files changed, 72 insertions, 19 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 47882bf..fa3b43b 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -54,7 +54,8 @@ static struct hibernation_ops *hibernation_ops;
void hibernation_set_ops(struct hibernation_ops *ops)
{
- if (ops && !(ops->prepare && ops->enter && ops->finish)) {
+ if (ops && !(ops->prepare && ops->enter && ops->finish
+ && ops->pre_restore && ops->restore_cleanup)) {
WARN_ON(1);
return;
}
@@ -92,6 +93,31 @@ static void platform_finish(int platform_mode)
}
/**
+ * 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 int platform_pre_restore(int platform_mode)
+{
+ return (platform_mode && hibernation_ops) ?
+ hibernation_ops->pre_restore() : 0;
+}
+
+/**
+ * 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
@@ -141,11 +167,13 @@ int hibernation_snapshot(int platform_mode)
/**
* 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(void)
+int hibernation_restore(int platform_mode)
{
int error;
@@ -155,11 +183,14 @@ int hibernation_restore(void)
if (error)
goto Finish;
- error = disable_nonboot_cpus();
- if (!error)
- error = swsusp_resume();
-
- enable_nonboot_cpus();
+ 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();
@@ -260,8 +291,12 @@ int hibernate(void)
}
error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
if (in_suspend && !error) {
+ unsigned int flags = 0;
+
+ if (hibernation_mode == HIBERNATION_PLATFORM)
+ flags |= SF_PLATFORM_MODE;
pr_debug("PM: writing image.\n");
- error = swsusp_write();
+ error = swsusp_write(flags);
swsusp_free();
if (!error)
power_down();
@@ -295,6 +330,7 @@ int hibernate(void)
static int software_resume(void)
{
int error;
+ unsigned int flags;
mutex_lock(&pm_mutex);
if (!swsusp_resume_device) {
@@ -342,9 +378,9 @@ static int software_resume(void)
pr_debug("PM: Reading swsusp image.\n");
- error = swsusp_read();
+ error = swsusp_read(&flags);
if (!error)
- hibernation_restore();
+ hibernation_restore(flags & SF_PLATFORM_MODE);
printk(KERN_ERR "PM: Restore failed, recovering.\n");
swsusp_free();
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 70c378b..eab3603 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -27,7 +27,7 @@ struct swsusp_info {
/* kernel/power/disk.c */
extern int hibernation_snapshot(int platform_mode);
-extern int hibernation_restore(void);
+extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);
#endif
@@ -155,13 +155,20 @@ extern sector_t alloc_swapdev_block(int swap);
extern void free_all_swap_pages(int swap);
extern int swsusp_swap_in_use(void);
+/*
+ * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
+ * the image header.
+ */
+#define SF_PLATFORM_MODE 1
+
+/* kernel/power/disk.c */
extern int swsusp_check(void);
extern int swsusp_shrink_memory(void);
extern void swsusp_free(void);
extern int swsusp_suspend(void);
extern int swsusp_resume(void);
-extern int swsusp_read(void);
-extern int swsusp_write(void);
+extern int swsusp_read(unsigned int *flags_p);
+extern int swsusp_write(unsigned int flags);
extern void swsusp_close(void);
extern int suspend_enter(suspend_state_t state);
diff --git a/kernel/power/swap.c b/kernel/power/swap.c
index 8b1a1b8..917aba1 100644
--- a/kernel/power/swap.c
+++ b/kernel/power/swap.c
@@ -33,8 +33,9 @@ extern char resume_file[];
#define SWSUSP_SIG "S1SUSPEND"
struct swsusp_header {
- char reserved[PAGE_SIZE - 20 - sizeof(sector_t)];
+ char reserved[PAGE_SIZE - 20 - sizeof(sector_t) - sizeof(int)];
sector_t image;
+ unsigned int flags; /* Flags to pass to the "boot" kernel */
char orig_sig[10];
char sig[10];
} __attribute__((packed));
@@ -138,7 +139,7 @@ static int wait_on_bio_chain(struct bio **bio_chain)
* Saving part
*/
-static int mark_swapfiles(sector_t start)
+static int mark_swapfiles(sector_t start, unsigned int flags)
{
int error;
@@ -148,6 +149,7 @@ static int mark_swapfiles(sector_t start)
memcpy(swsusp_header->orig_sig,swsusp_header->sig, 10);
memcpy(swsusp_header->sig,SWSUSP_SIG, 10);
swsusp_header->image = start;
+ swsusp_header->flags = flags;
error = bio_write_page(swsusp_resume_block,
swsusp_header, NULL);
} else {
@@ -369,6 +371,7 @@ static int enough_swap(unsigned int nr_pages)
/**
* swsusp_write - Write entire image and metadata.
+ * @flags: flags to pass to the "boot" kernel in the image header
*
* It is important _NOT_ to umount filesystems at this point. We want
* them synced (in case something goes wrong) but we DO not want to mark
@@ -376,7 +379,7 @@ static int enough_swap(unsigned int nr_pages)
* correctly, we'll mark system clean, anyway.)
*/
-int swsusp_write(void)
+int swsusp_write(unsigned int flags)
{
struct swap_map_handle handle;
struct snapshot_handle snapshot;
@@ -415,7 +418,7 @@ int swsusp_write(void)
if (!error) {
flush_swap_writer(&handle);
printk("S");
- error = mark_swapfiles(start);
+ error = mark_swapfiles(start, flags);
printk("|\n");
}
}
@@ -540,13 +543,20 @@ static int load_image(struct swap_map_handle *handle,
return error;
}
-int swsusp_read(void)
+/**
+ * swsusp_read - read the hibernation image.
+ * @flags_p: flags passed by the "frozen" kernel in the image header should
+ * be written into this memeory location
+ */
+
+int swsusp_read(unsigned int *flags_p)
{
int error;
struct swap_map_handle handle;
struct snapshot_handle snapshot;
struct swsusp_info *header;
+ *flags_p = swsusp_header->flags;
if (IS_ERR(resume_bdev)) {
pr_debug("swsusp: block device not initialised\n");
return PTR_ERR(resume_bdev);
diff --git a/kernel/power/user.c b/kernel/power/user.c
index bfed3b9..1f24f30 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -188,7 +188,7 @@ static int snapshot_ioctl(struct inode *inode, struct file *filp,
error = -EPERM;
break;
}
- error = hibernation_restore();
+ error = hibernation_restore(data->platform_suspend);
break;
case SNAPSHOT_FREE:
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