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authorRafael J. Wysocki <rjw@sisk.pl>2007-07-19 01:47:36 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:42 -0700
commitb10d911749d37dccfa5873d2088aea3f074b9e45 (patch)
tree56bd0ccb2861d7ae562d4e48a737727628358b42 /include
parentc2cf7d87d804c66e063829d5ca739053e901dc15 (diff)
PM: introduce hibernation and suspend notifiers
Make it possible to register hibernation and suspend notifiers, so that subsystems can perform hibernation-related or suspend-related operations that should not be carried out by device drivers' .suspend() and .resume() routines. [akpm@linux-foundation.org: build fixes] [akpm@linux-foundation.org: cleanups] Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Cc: Nigel Cunningham <nigel@nigel.suspend2.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/notifier.h6
-rw-r--r--include/linux/suspend.h48
2 files changed, 49 insertions, 5 deletions
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 576f2bb34cc..be3f2bb6fcf 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -212,5 +212,11 @@ extern int __srcu_notifier_call_chain(struct srcu_notifier_head *nh,
#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
+/* Hibernation and suspend events */
+#define PM_HIBERNATION_PREPARE 0x0001 /* Going to hibernate */
+#define PM_POST_HIBERNATION 0x0002 /* Hibernation finished */
+#define PM_SUSPEND_PREPARE 0x0003 /* Going to suspend the system */
+#define PM_POST_SUSPEND 0x0004 /* Suspend finished */
+
#endif /* __KERNEL__ */
#endif /* _LINUX_NOTIFIER_H */
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index d235c146da2..e8e6da394c9 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -54,7 +54,8 @@ struct hibernation_ops {
void (*restore_cleanup)(void);
};
-#if defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND)
+#ifdef CONFIG_PM
+#ifdef CONFIG_SOFTWARE_SUSPEND
/* kernel/power/snapshot.c */
extern void __register_nosave_region(unsigned long b, unsigned long e, int km);
static inline void register_nosave_region(unsigned long b, unsigned long e)
@@ -72,16 +73,14 @@ extern unsigned long get_safe_page(gfp_t gfp_mask);
extern void hibernation_set_ops(struct hibernation_ops *ops);
extern int hibernate(void);
-#else
-static inline void register_nosave_region(unsigned long b, unsigned long e) {}
-static inline void register_nosave_region_late(unsigned long b, unsigned long e) {}
+#else /* CONFIG_SOFTWARE_SUSPEND */
static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
static inline void swsusp_set_page_free(struct page *p) {}
static inline void swsusp_unset_page_free(struct page *p) {}
static inline void hibernation_set_ops(struct hibernation_ops *ops) {}
static inline int hibernate(void) { return -ENOSYS; }
-#endif /* defined(CONFIG_PM) && defined(CONFIG_SOFTWARE_SUSPEND) */
+#endif /* CONFIG_SOFTWARE_SUSPEND */
void save_processor_state(void);
void restore_processor_state(void);
@@ -89,4 +88,43 @@ struct saved_context;
void __save_processor_state(struct saved_context *ctxt);
void __restore_processor_state(struct saved_context *ctxt);
+/* kernel/power/main.c */
+extern struct blocking_notifier_head pm_chain_head;
+
+static inline int register_pm_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&pm_chain_head, nb);
+}
+
+static inline int unregister_pm_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&pm_chain_head, nb);
+}
+
+#define pm_notifier(fn, pri) { \
+ static struct notifier_block fn##_nb = \
+ { .notifier_call = fn, .priority = pri }; \
+ register_pm_notifier(&fn##_nb); \
+}
+#else /* CONFIG_PM */
+
+static inline int register_pm_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+static inline int unregister_pm_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+
+#define pm_notifier(fn, pri) do { (void)(fn); } while (0)
+#endif /* CONFIG_PM */
+
+#if !defined CONFIG_SOFTWARE_SUSPEND || !defined(CONFIG_PM)
+static inline void register_nosave_region(unsigned long b, unsigned long e)
+{
+}
+#endif
+
#endif /* _LINUX_SWSUSP_H */