suspend: Move NVS save/restore code to generic suspend functionality

Saving platform non-volatile state may be required for suspend to RAM as
well as hibernation. Move it to more generic code.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Tested-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

arch/x86/kernel/e820.c

@@ -729,7 +729,7 @@ static int __init e820_mark_nvs_memory(void)
 		struct e820entry *ei = &e820.map[i];
 
 		if (ei->type == E820_NVS)
-			hibernate_nvs_register(ei->addr, ei->size);
+			suspend_nvs_register(ei->addr, ei->size);
 	}
 
 	return 0;

drivers/acpi/sleep.c

@@ -393,7 +393,7 @@ static int acpi_hibernation_begin(void)
 {
 	int error;
 
-	error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
+	error = s4_no_nvs ? 0 : suspend_nvs_alloc();
 	if (!error) {
 		acpi_target_sleep_state = ACPI_STATE_S4;
 		acpi_sleep_tts_switch(acpi_target_sleep_state);
@@ -407,7 +407,7 @@ static int acpi_hibernation_pre_snapshot(void)
 	int error = acpi_pm_prepare();
 
 	if (!error)
-		hibernate_nvs_save();
+		suspend_nvs_save();
 
 	return error;
 }
@@ -432,7 +432,7 @@ static int acpi_hibernation_enter(void)
 
 static void acpi_hibernation_finish(void)
 {
-	hibernate_nvs_free();
+	suspend_nvs_free();
 	acpi_pm_finish();
 }
 
@@ -452,7 +452,7 @@ static void acpi_hibernation_leave(void)
 		panic("ACPI S4 hardware signature mismatch");
 	}
 	/* Restore the NVS memory area */
-	hibernate_nvs_restore();
+	suspend_nvs_restore();
 }
 
 static int acpi_pm_pre_restore(void)
@@ -501,7 +501,7 @@ static int acpi_hibernation_begin_old(void)
 
 	if (!error) {
 		if (!s4_no_nvs)
-			error = hibernate_nvs_alloc();
+			error = suspend_nvs_alloc();
 		if (!error)
 			acpi_target_sleep_state = ACPI_STATE_S4;
 	}
@@ -513,7 +513,7 @@ static int acpi_hibernation_pre_snapshot_old(void)
 	int error = acpi_pm_disable_gpes();
 
 	if (!error)
-		hibernate_nvs_save();
+		suspend_nvs_save();
 
 	return error;
 }

include/linux/suspend.h

@@ -256,22 +256,22 @@ static inline int hibernate(void) { return -ENOSYS; }
 static inline bool system_entering_hibernation(void) { return false; }
 #endif /* CONFIG_HIBERNATION */
 
-#ifdef CONFIG_HIBERNATION_NVS
-extern int hibernate_nvs_register(unsigned long start, unsigned long size);
-extern int hibernate_nvs_alloc(void);
-extern void hibernate_nvs_free(void);
-extern void hibernate_nvs_save(void);
-extern void hibernate_nvs_restore(void);
-#else /* CONFIG_HIBERNATION_NVS */
-static inline int hibernate_nvs_register(unsigned long a, unsigned long b)
+#ifdef CONFIG_SUSPEND_NVS
+extern int suspend_nvs_register(unsigned long start, unsigned long size);
+extern int suspend_nvs_alloc(void);
+extern void suspend_nvs_free(void);
+extern void suspend_nvs_save(void);
+extern void suspend_nvs_restore(void);
+#else /* CONFIG_SUSPEND_NVS */
+static inline int suspend_nvs_register(unsigned long a, unsigned long b)
 {
 	return 0;
 }
-static inline int hibernate_nvs_alloc(void) { return 0; }
-static inline void hibernate_nvs_free(void) {}
-static inline void hibernate_nvs_save(void) {}
-static inline void hibernate_nvs_restore(void) {}
-#endif /* CONFIG_HIBERNATION_NVS */
+static inline int suspend_nvs_alloc(void) { return 0; }
+static inline void suspend_nvs_free(void) {}
+static inline void suspend_nvs_save(void) {}
+static inline void suspend_nvs_restore(void) {}
+#endif /* CONFIG_SUSPEND_NVS */
 
 #ifdef CONFIG_PM_SLEEP
 void save_processor_state(void);

kernel/power/Kconfig

@@ -99,9 +99,13 @@ config PM_SLEEP_ADVANCED_DEBUG
 	depends on PM_ADVANCED_DEBUG
 	default n
 
+config SUSPEND_NVS
+       bool
+
 config SUSPEND
 	bool "Suspend to RAM and standby"
 	depends on PM && ARCH_SUSPEND_POSSIBLE
+	select SUSPEND_NVS if HAS_IOMEM
 	default y
 	---help---
 	  Allow the system to enter sleep states in which main memory is
@@ -130,13 +134,10 @@ config SUSPEND_FREEZER
 
 	  Turning OFF this setting is NOT recommended! If in doubt, say Y.
 
-config HIBERNATION_NVS
-	bool
-
 config HIBERNATION
 	bool "Hibernation (aka 'suspend to disk')"
 	depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
-	select HIBERNATION_NVS if HAS_IOMEM
+	select SUSPEND_NVS if HAS_IOMEM
 	---help---
 	  Enable the suspend to disk (STD) functionality, which is usually
 	  called "hibernation" in user interfaces.  STD checkpoints the

kernel/power/Makefile

@@ -10,6 +10,6 @@ obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PM_TEST_SUSPEND)	+= suspend_test.o
 obj-$(CONFIG_HIBERNATION)	+= hibernate.o snapshot.o swap.o user.o \
 				   block_io.o
-obj-$(CONFIG_HIBERNATION_NVS)	+= hibernate_nvs.o
+obj-$(CONFIG_SUSPEND_NVS)	+= nvs.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o

kernel/power/nvs.c

@@ -15,7 +15,7 @@
 
 /*
  * Platforms, like ACPI, may want us to save some memory used by them during
- * hibernation and to restore the contents of this memory during the subsequent
+ * suspend and to restore the contents of this memory during the subsequent
  * resume.  The code below implements a mechanism allowing us to do that.
  */
 
@@ -30,7 +30,7 @@ struct nvs_page {
 static LIST_HEAD(nvs_list);
 
 /**
- *	hibernate_nvs_register - register platform NVS memory region to save
+ *	suspend_nvs_register - register platform NVS memory region to save
  *	@start - physical address of the region
  *	@size - size of the region
  *
@@ -38,7 +38,7 @@ static LIST_HEAD(nvs_list);
  *	things so that the data from page-aligned addresses in this region will
  *	be copied into separate RAM pages.
  */
-int hibernate_nvs_register(unsigned long start, unsigned long size)
+int suspend_nvs_register(unsigned long start, unsigned long size)
 {
 	struct nvs_page *entry, *next;
 
@@ -68,9 +68,9 @@ int hibernate_nvs_register(unsigned long start, unsigned long size)
 }
 
 /**
- *	hibernate_nvs_free - free data pages allocated for saving NVS regions
+ *	suspend_nvs_free - free data pages allocated for saving NVS regions
  */
-void hibernate_nvs_free(void)
+void suspend_nvs_free(void)
 {
 	struct nvs_page *entry;
 
@@ -86,16 +86,16 @@ void hibernate_nvs_free(void)
 }
 
 /**
- *	hibernate_nvs_alloc - allocate memory necessary for saving NVS regions
+ *	suspend_nvs_alloc - allocate memory necessary for saving NVS regions
  */
-int hibernate_nvs_alloc(void)
+int suspend_nvs_alloc(void)
 {
 	struct nvs_page *entry;
 
 	list_for_each_entry(entry, &nvs_list, node) {
 		entry->data = (void *)__get_free_page(GFP_KERNEL);
 		if (!entry->data) {
-			hibernate_nvs_free();
+			suspend_nvs_free();
 			return -ENOMEM;
 		}
 	}
@@ -103,9 +103,9 @@ int hibernate_nvs_alloc(void)
 }
 
 /**
- *	hibernate_nvs_save - save NVS memory regions
+ *	suspend_nvs_save - save NVS memory regions
  */
-void hibernate_nvs_save(void)
+void suspend_nvs_save(void)
 {
 	struct nvs_page *entry;
 
@@ -119,12 +119,12 @@ void hibernate_nvs_save(void)
 }
 
 /**
- *	hibernate_nvs_restore - restore NVS memory regions
+ *	suspend_nvs_restore - restore NVS memory regions
  *
  *	This function is going to be called with interrupts disabled, so it
  *	cannot iounmap the virtual addresses used to access the NVS region.
  */
-void hibernate_nvs_restore(void)
+void suspend_nvs_restore(void)
 {
 	struct nvs_page *entry;
 

kernel/power/suspend.c

@@ -16,6 +16,12 @@
 #include <linux/cpu.h>
 #include <linux/syscalls.h>
 #include <linux/gfp.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/suspend.h>
 
 #include "power.h"