PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKS

Xen save/restore is going to use hibernate device callbacks for
quiescing devices and putting them back to normal operations and it
would need to select CONFIG_HIBERNATION for this purpose.  However,
that also would cause the hibernate interfaces for user space to be
enabled, which might confuse user space, because the Xen kernels
don't support hibernation.  Moreover, it would be wasteful, as it
would make the Xen kernels include a substantial amount of code that
they would never use.

To address this issue introduce new power management Kconfig option
CONFIG_HIBERNATE_CALLBACKS, such that it will only select the code
that is necessary for the hibernate device callbacks to work and make
CONFIG_HIBERNATION select it.  Then, Xen save/restore will be able to
select CONFIG_HIBERNATE_CALLBACKS without dragging the entire
hibernate code along with it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>

diff --git a/arch/powerpc/kernel/ibmebus.c b/arch/powerpc/kernel/ibmebus.c
index c00d4ca..28581f1 100644 (file)
--- a/arch/powerpc/kernel/ibmebus.c
+++ b/arch/powerpc/kernel/ibmebus.c
@@ -527,7 +527,7 @@ static int ibmebus_bus_pm_resume_noirq(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int ibmebus_bus_pm_freeze(struct device *dev)
 {
@@ -665,7 +665,7 @@ static int ibmebus_bus_pm_restore_noirq(struct device *dev)
        return ret;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define ibmebus_bus_pm_freeze          NULL
 #define ibmebus_bus_pm_thaw            NULL
@@ -676,7 +676,7 @@ static int ibmebus_bus_pm_restore_noirq(struct device *dev)
 #define ibmebus_bus_pm_poweroff_noirq  NULL
 #define ibmebus_bus_pm_restore_noirq   NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 static struct dev_pm_ops ibmebus_bus_dev_pm_ops = {
        .prepare = ibmebus_bus_pm_prepare,

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 8210405..7025593 100644 (file)
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -214,7 +214,7 @@ static int amba_pm_resume_noirq(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int amba_pm_freeze(struct device *dev)
 {
@@ -352,7 +352,7 @@ static int amba_pm_restore_noirq(struct device *dev)
        return ret;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define amba_pm_freeze         NULL
 #define amba_pm_thaw           NULL
@@ -363,7 +363,7 @@ static int amba_pm_restore_noirq(struct device *dev)
 #define amba_pm_poweroff_noirq NULL
 #define amba_pm_restore_noirq  NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM
 

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f051cff..9279231 100644 (file)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -771,7 +771,7 @@ int __weak platform_pm_resume_noirq(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int platform_pm_freeze(struct device *dev)
 {
@@ -909,7 +909,7 @@ static int platform_pm_restore_noirq(struct device *dev)
        return ret;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define platform_pm_freeze             NULL
 #define platform_pm_thaw               NULL
@@ -920,7 +920,7 @@ static int platform_pm_restore_noirq(struct device *dev)
 #define platform_pm_poweroff_noirq     NULL
 #define platform_pm_restore_noirq      NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM_RUNTIME
 

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 052dc53..fbc5b6e 100644 (file)
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -233,7 +233,7 @@ static int pm_op(struct device *dev,
                }
                break;
 #endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
        case PM_EVENT_FREEZE:
        case PM_EVENT_QUIESCE:
                if (ops->freeze) {
@@ -260,7 +260,7 @@ static int pm_op(struct device *dev,
                        suspend_report_result(ops->restore, error);
                }
                break;
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATE_CALLBACKS */
        default:
                error = -EINVAL;
        }
@@ -308,7 +308,7 @@ static int pm_noirq_op(struct device *dev,
                }
                break;
 #endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
        case PM_EVENT_FREEZE:
        case PM_EVENT_QUIESCE:
                if (ops->freeze_noirq) {
@@ -335,7 +335,7 @@ static int pm_noirq_op(struct device *dev,
                        suspend_report_result(ops->restore_noirq, error);
                }
                break;
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATE_CALLBACKS */
        default:
                error = -EINVAL;
        }

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index d86ea8b..135df16 100644 (file)
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -781,7 +781,7 @@ static int pci_pm_resume(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int pci_pm_freeze(struct device *dev)
 {
@@ -970,7 +970,7 @@ static int pci_pm_restore(struct device *dev)
        return error;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define pci_pm_freeze          NULL
 #define pci_pm_freeze_noirq    NULL
@@ -981,7 +981,7 @@ static int pci_pm_restore(struct device *dev)
 #define pci_pm_restore         NULL
 #define pci_pm_restore_noirq   NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM_RUNTIME
 

diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 95143dd..1ac9412 100644 (file)
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -61,7 +61,7 @@ static void xen_post_suspend(int cancelled)
        xen_mm_unpin_all();
 }
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 static int xen_suspend(void *data)
 {
        struct suspend_info *si = data;
@@ -173,7 +173,7 @@ out:
 #endif
        shutting_down = SHUTDOWN_INVALID;
 }
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATE_CALLBACKS */
 
 struct shutdown_handler {
        const char *command;
@@ -202,7 +202,7 @@ static void shutdown_handler(struct xenbus_watch *watch,
                { "poweroff",   do_poweroff },
                { "halt",       do_poweroff },
                { "reboot",     do_reboot   },
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
                { "suspend",    do_suspend  },
 #endif
                {NULL, NULL},

diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 5a89e36..083ffea 100644 (file)
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -249,6 +249,8 @@ extern void hibernation_set_ops(const struct platform_hibernation_ops *ops);
 extern int hibernate(void);
 extern bool system_entering_hibernation(void);
 #else /* CONFIG_HIBERNATION */
+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) {}
 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) {}
@@ -297,14 +299,7 @@ static inline bool pm_wakeup_pending(void) { return false; }
 
 extern struct mutex pm_mutex;
 
-#ifndef CONFIG_HIBERNATION
-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)
-{
-}
-
+#ifndef CONFIG_HIBERNATE_CALLBACKS
 static inline void lock_system_sleep(void) {}
 static inline void unlock_system_sleep(void) {}
 

diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 4603f08..0497914 100644 (file)
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -18,9 +18,13 @@ config SUSPEND_FREEZER
 
          Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
+config HIBERNATE_CALLBACKS
+       bool
+
 config HIBERNATION
        bool "Hibernation (aka 'suspend to disk')"
        depends on SWAP && ARCH_HIBERNATION_POSSIBLE
+       select HIBERNATE_CALLBACKS
        select LZO_COMPRESS
        select LZO_DECOMPRESS
        ---help---
@@ -85,7 +89,7 @@ config PM_STD_PARTITION
 
 config PM_SLEEP
        def_bool y
-       depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
+       depends on SUSPEND || HIBERNATE_CALLBACKS || XEN_SAVE_RESTORE
 
 config PM_SLEEP_SMP
        def_bool y