Hibernation: Introduce exportable suspend ioctls header (rev. 2)

[linux-2.6-omap-h63xx.git] / kernel / power / power.h

diff --git a/kernel/power/power.h b/kernel/power/power.h
index 01c2275b15b2556353fc00f091c2962e88f0a1a4..ef9060576a40a65df08e038f41244b018e4698aa 100644 (file)
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -1,4 +1,5 @@
 #include <linux/suspend.h>
+#include <linux/suspend_ioctls.h>
 #include <linux/utsname.h>
 
 struct swsusp_info {
@@ -11,14 +12,32 @@ struct swsusp_info {
        unsigned long           size;
 } __attribute__((aligned(PAGE_SIZE)));
 
+#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_ARCH_HIBERNATION_HEADER
+/* Maximum size of architecture specific data in a hibernation header */
+#define MAX_ARCH_HEADER_SIZE   (sizeof(struct new_utsname) + 4)
 
+extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
+extern int arch_hibernation_header_restore(void *addr);
+
+static inline int init_header_complete(struct swsusp_info *info)
+{
+       return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
+}
+
+static inline char *check_image_kernel(struct swsusp_info *info)
+{
+       return arch_hibernation_header_restore(info) ?
+                       "architecture specific data" : NULL;
+}
+#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
 
-#ifdef CONFIG_SOFTWARE_SUSPEND
 /*
  * Keep some memory free so that I/O operations can succeed without paging
  * [Might this be more than 4 MB?]
  */
 #define PAGES_FOR_IO   ((4096 * 1024) >> PAGE_SHIFT)
+
 /*
  * Keep 1 MB of memory free so that device drivers can allocate some pages in
  * their .suspend() routines without breaking the suspend to disk.
@@ -36,7 +55,7 @@ extern int pfn_is_nosave(unsigned long);
 extern struct mutex pm_mutex;
 
 #define power_attr(_name) \
-static struct subsys_attribute _name##_attr = {        \
+static struct kobj_attribute _name##_attr = {  \
        .attr   = {                             \
                .name = __stringify(_name),     \
                .mode = 0644,                   \
@@ -45,8 +64,6 @@ static struct subsys_attribute _name##_attr = {       \
        .store  = _name##_store,                \
 }
 
-extern struct kset power_subsys;
-
 /* Preferred image size in bytes (default 500 MB) */
 extern unsigned long image_size;
 extern int in_suspend;
@@ -112,42 +129,12 @@ struct snapshot_handle {
 #define data_of(handle)        ((handle).buffer + (handle).buf_offset)
 
 extern unsigned int snapshot_additional_pages(struct zone *zone);
+extern unsigned long snapshot_get_image_size(void);
 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
 extern void snapshot_write_finalize(struct snapshot_handle *handle);
 extern int snapshot_image_loaded(struct snapshot_handle *handle);
 
-/*
- * This structure is used to pass the values needed for the identification
- * of the resume swap area from a user space to the kernel via the
- * SNAPSHOT_SET_SWAP_AREA ioctl
- */
-struct resume_swap_area {
-       loff_t offset;
-       u_int32_t dev;
-} __attribute__((packed));
-
-#define SNAPSHOT_IOC_MAGIC     '3'
-#define SNAPSHOT_FREEZE                        _IO(SNAPSHOT_IOC_MAGIC, 1)
-#define SNAPSHOT_UNFREEZE              _IO(SNAPSHOT_IOC_MAGIC, 2)
-#define SNAPSHOT_ATOMIC_SNAPSHOT       _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
-#define SNAPSHOT_ATOMIC_RESTORE                _IO(SNAPSHOT_IOC_MAGIC, 4)
-#define SNAPSHOT_FREE                  _IO(SNAPSHOT_IOC_MAGIC, 5)
-#define SNAPSHOT_SET_IMAGE_SIZE                _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
-#define SNAPSHOT_AVAIL_SWAP            _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
-#define SNAPSHOT_GET_SWAP_PAGE         _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
-#define SNAPSHOT_FREE_SWAP_PAGES       _IO(SNAPSHOT_IOC_MAGIC, 9)
-#define SNAPSHOT_SET_SWAP_FILE         _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
-#define SNAPSHOT_S2RAM                 _IO(SNAPSHOT_IOC_MAGIC, 11)
-#define SNAPSHOT_PMOPS                 _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
-#define SNAPSHOT_SET_SWAP_AREA         _IOW(SNAPSHOT_IOC_MAGIC, 13, \
-                                                       struct resume_swap_area)
-#define SNAPSHOT_IOC_MAXNR     13
-
-#define PMOPS_PREPARE  1
-#define PMOPS_ENTER    2
-#define PMOPS_FINISH   3
-
 /* If unset, the snapshot device cannot be open. */
 extern atomic_t snapshot_device_available;
 
@@ -165,19 +152,27 @@ extern int swsusp_swap_in_use(void);
 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(unsigned int *flags_p);
 extern int swsusp_write(unsigned int flags);
 extern void swsusp_close(void);
-extern int suspend_enter(suspend_state_t state);
 
 struct timeval;
 /* kernel/power/swsusp.c */
 extern void swsusp_show_speed(struct timeval *, struct timeval *,
                                unsigned int, char *);
 
+#ifdef CONFIG_SUSPEND
 /* kernel/power/main.c */
+extern int suspend_devices_and_enter(suspend_state_t state);
+#else /* !CONFIG_SUSPEND */
+static inline int suspend_devices_and_enter(suspend_state_t state)
+{
+       return -ENOSYS;
+}
+#endif /* !CONFIG_SUSPEND */
+
+/* kernel/power/common.c */
 extern struct blocking_notifier_head pm_chain_head;
 
 static inline int pm_notifier_call_chain(unsigned long val)