Commit fce2b111 authored by Cornelia Huck's avatar Cornelia Huck Committed by Rafael J. Wysocki
Browse files

PM/Hibernate: Move NVS routines into a seperate file (v2). 



The *_nvs_* routines in swsusp.c make use of the io*map()
functions, which are only provided for HAS_IOMEM, thus
breaking compilation if HAS_IOMEM is not set. Fix this
by moving the *_nvs_* routines into hibernate_nvs.c, which
is only compiled if HAS_IOMEM is set.

[rjw: Change the name of the new file to hibernate_nvs.c, add the
 license line to the header comment.]

Signed-off-by: default avatarCornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: default avatarPavel Machek <pavel@ucw.cz>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
parent 8b759b84

include/linux/suspend.h

+11 −7
Original line number Diff line number Diff line
@@ -245,11 +245,6 @@ extern unsigned long get_safe_page(gfp_t gfp_mask); 


extern void hibernation_set_ops(struct platform_hibernation_ops *ops);

extern int hibernate(void);

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);

extern bool system_entering_hibernation(void);

#else /* CONFIG_HIBERNATION */

static inline int swsusp_page_is_forbidden(struct page *p) { return 0; }
@@ -258,6 +253,16 @@ static inline void swsusp_unset_page_free(struct page *p) {} 


static inline void hibernation_set_ops(struct platform_hibernation_ops *ops) {}

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)

{

	return 0;
@@ -266,8 +271,7 @@ 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) {}

static inline bool system_entering_hibernation(void) { return false; }

#endif /* CONFIG_HIBERNATION */

#endif /* CONFIG_HIBERNATION_NVS */



#ifdef CONFIG_PM_SLEEP

void save_processor_state(void);

kernel/power/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -116,9 +116,13 @@ 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

	---help---

	  Enable the suspend to disk (STD) functionality, which is usually

	  called "hibernation" in user interfaces.  STD checkpoints the

kernel/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -9,5 +9,6 @@ obj-$(CONFIG_FREEZER) += process.o 
obj-$(CONFIG_SUSPEND)		+= suspend.o

obj-$(CONFIG_PM_TEST_SUSPEND)	+= suspend_test.o

obj-$(CONFIG_HIBERNATION)	+= swsusp.o hibernate.o snapshot.o swap.o user.o

obj-$(CONFIG_HIBERNATION_NVS)	+= hibernate_nvs.o



obj-$(CONFIG_MAGIC_SYSRQ)	+= poweroff.o

kernel/power/hibernate_nvs.c

0 → 100644
+135 −0
Original line number Diff line number Diff line 
/*

 * linux/kernel/power/hibernate_nvs.c - Routines for handling NVS memory

 *

 * Copyright (C) 2008,2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.

 *

 * This file is released under the GPLv2.

 */



#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/list.h>

#include <linux/mm.h>

#include <linux/suspend.h>



/*

 * 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

 * resume.  The code below implements a mechanism allowing us to do that.

 */



struct nvs_page {

	unsigned long phys_start;

	unsigned int size;

	void *kaddr;

	void *data;

	struct list_head node;

};



static LIST_HEAD(nvs_list);



/**

 *	hibernate_nvs_register - register platform NVS memory region to save

 *	@start - physical address of the region

 *	@size - size of the region

 *

 *	The NVS region need not be page-aligned (both ends) and we arrange

 *	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)

{

	struct nvs_page *entry, *next;



	while (size > 0) {

		unsigned int nr_bytes;



		entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);

		if (!entry)

			goto Error;



		list_add_tail(&entry->node, &nvs_list);

		entry->phys_start = start;

		nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);

		entry->size = (size < nr_bytes) ? size : nr_bytes;



		start += entry->size;

		size -= entry->size;

	}

	return 0;



 Error:

	list_for_each_entry_safe(entry, next, &nvs_list, node) {

		list_del(&entry->node);

		kfree(entry);

	}

	return -ENOMEM;

}



/**

 *	hibernate_nvs_free - free data pages allocated for saving NVS regions

 */

void hibernate_nvs_free(void)

{

	struct nvs_page *entry;



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data) {

			free_page((unsigned long)entry->data);

			entry->data = NULL;

			if (entry->kaddr) {

				iounmap(entry->kaddr);

				entry->kaddr = NULL;

			}

		}

}



/**

 *	hibernate_nvs_alloc - allocate memory necessary for saving NVS regions

 */

int hibernate_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();

			return -ENOMEM;

		}

	}

	return 0;

}



/**

 *	hibernate_nvs_save - save NVS memory regions

 */

void hibernate_nvs_save(void)

{

	struct nvs_page *entry;



	printk(KERN_INFO "PM: Saving platform NVS memory\n");



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data) {

			entry->kaddr = ioremap(entry->phys_start, entry->size);

			memcpy(entry->data, entry->kaddr, entry->size);

		}

}



/**

 *	hibernate_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)

{

	struct nvs_page *entry;



	printk(KERN_INFO "PM: Restoring platform NVS memory\n");



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data)

			memcpy(entry->kaddr, entry->data, entry->size);

}

kernel/power/swsusp.c

+0 −122
Original line number Diff line number Diff line
@@ -186,125 +186,3 @@ void swsusp_show_speed(struct timeval *start, struct timeval *stop, 
			centisecs / 100, centisecs % 100,

			kps / 1000, (kps % 1000) / 10);

}
 


/*

 * 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

 * resume.  The code below implements a mechanism allowing us to do that.

 */



struct nvs_page {

	unsigned long phys_start;

	unsigned int size;

	void *kaddr;

	void *data;

	struct list_head node;

};



static LIST_HEAD(nvs_list);



/**

 *	hibernate_nvs_register - register platform NVS memory region to save

 *	@start - physical address of the region

 *	@size - size of the region

 *

 *	The NVS region need not be page-aligned (both ends) and we arrange

 *	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)

{

	struct nvs_page *entry, *next;



	while (size > 0) {

		unsigned int nr_bytes;



		entry = kzalloc(sizeof(struct nvs_page), GFP_KERNEL);

		if (!entry)

			goto Error;



		list_add_tail(&entry->node, &nvs_list);

		entry->phys_start = start;

		nr_bytes = PAGE_SIZE - (start & ~PAGE_MASK);

		entry->size = (size < nr_bytes) ? size : nr_bytes;



		start += entry->size;

		size -= entry->size;

	}

	return 0;



 Error:

	list_for_each_entry_safe(entry, next, &nvs_list, node) {

		list_del(&entry->node);

		kfree(entry);

	}

	return -ENOMEM;

}



/**

 *	hibernate_nvs_free - free data pages allocated for saving NVS regions

 */

void hibernate_nvs_free(void)

{

	struct nvs_page *entry;



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data) {

			free_page((unsigned long)entry->data);

			entry->data = NULL;

			if (entry->kaddr) {

				iounmap(entry->kaddr);

				entry->kaddr = NULL;

			}

		}

}



/**

 *	hibernate_nvs_alloc - allocate memory necessary for saving NVS regions

 */

int hibernate_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();

			return -ENOMEM;

		}

	}

	return 0;

}



/**

 *	hibernate_nvs_save - save NVS memory regions

 */

void hibernate_nvs_save(void)

{

	struct nvs_page *entry;



	printk(KERN_INFO "PM: Saving platform NVS memory\n");



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data) {

			entry->kaddr = ioremap(entry->phys_start, entry->size);

			memcpy(entry->data, entry->kaddr, entry->size);

		}

}



/**

 *	hibernate_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)

{

	struct nvs_page *entry;



	printk(KERN_INFO "PM: Restoring platform NVS memory\n");



	list_for_each_entry(entry, &nvs_list, node)

		if (entry->data)

			memcpy(entry->kaddr, entry->data, entry->size);

}

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