Release 4.15 kernel/power/power.h

Directory: kernel/power
/* SPDX-License-Identifier: GPL-2.0 */
#include <linux/suspend.h>
#include <linux/suspend_ioctls.h>
#include <linux/utsname.h>
#include <linux/freezer.h>
#include <linux/compiler.h>


struct swsusp_info {
	
struct new_utsname	uts;
	
u32			version_code;
	
unsigned long		num_physpages;
	
int			cpus;
	
unsigned long		image_pages;
	
unsigned long		pages;
	
unsigned long		size;
} __aligned(PAGE_SIZE);

#ifdef CONFIG_HIBERNATION
/* kernel/power/snapshot.c */
extern void __init hibernate_reserved_size_init(void);
extern void __init hibernate_image_size_init(void);

#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);
}

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static inline char *check_image_kernel(struct swsusp_info *info)
{
	return arch_hibernation_header_restore(info) ?
			"architecture specific data" : NULL;
}
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#endif /* CONFIG_ARCH_HIBERNATION_HEADER */

extern int hibernate_resume_nonboot_cpu_disable(void);

/*
 * 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.
 */

#define SPARE_PAGES	((1024 * 1024) >> PAGE_SHIFT)

asmlinkage int swsusp_save(void);

/* kernel/power/hibernate.c */
extern bool freezer_test_done;

extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);

#ifdef CONFIG_STRICT_KERNEL_RWX
/* kernel/power/snapshot.c */
extern void enable_restore_image_protection(void);
#else


static inline void enable_restore_image_protection(void) {}
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#endif /* CONFIG_STRICT_KERNEL_RWX */

#else /* !CONFIG_HIBERNATION */



static inline void hibernate_reserved_size_init(void) {}
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static inline void hibernate_image_size_init(void) {}
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#endif /* !CONFIG_HIBERNATION */

extern int pfn_is_nosave(unsigned long);


#define power_attr(_name) \
static struct kobj_attribute _name##_attr = {   \
        .attr   = {                             \
                .name = __stringify(_name),     \
                .mode = 0644,                   \
        },                                      \
        .show   = _name##_show,                 \
        .store  = _name##_store,                \
}


#define power_attr_ro(_name) \
static struct kobj_attribute _name##_attr = {   \
        .attr   = {                             \
                .name = __stringify(_name),     \
                .mode = S_IRUGO,                \
        },                                      \
        .show   = _name##_show,                 \
}

/* Preferred image size in bytes (default 500 MB) */
extern unsigned long image_size;
/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
extern unsigned long reserved_size;
extern int in_suspend;
extern dev_t swsusp_resume_device;
extern sector_t swsusp_resume_block;

extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);

extern int create_basic_memory_bitmaps(void);
extern void free_basic_memory_bitmaps(void);
extern int hibernate_preallocate_memory(void);

extern void clear_free_pages(void);

/**
 *      Auxiliary structure used for reading the snapshot image data and
 *      metadata from and writing them to the list of page backup entries
 *      (PBEs) which is the main data structure of swsusp.
 *
 *      Using struct snapshot_handle we can transfer the image, including its
 *      metadata, as a continuous sequence of bytes with the help of
 *      snapshot_read_next() and snapshot_write_next().
 *
 *      The code that writes the image to a storage or transfers it to
 *      the user land is required to use snapshot_read_next() for this
 *      purpose and it should not make any assumptions regarding the internal
 *      structure of the image.  Similarly, the code that reads the image from
 *      a storage or transfers it from the user land is required to use
 *      snapshot_write_next().
 *
 *      This may allow us to change the internal structure of the image
 *      in the future with considerably less effort.
 */


struct snapshot_handle {
	
unsigned int	cur;	/* number of the block of PAGE_SIZE bytes the
                                 * next operation will refer to (ie. current)
                                 */
	
void		*buffer;	/* address of the block to read from
                                         * or write to
                                         */
	
int		sync_read;	/* Set to one to notify the caller of
                                         * snapshot_write_next() that it may
                                         * need to call wait_on_bio_chain()
                                         */
};

/* This macro returns the address from/to which the caller of
 * snapshot_read_next()/snapshot_write_next() is allowed to
 * read/write data after the function returns
 */

#define data_of(handle)	((handle).buffer)

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);
extern int snapshot_write_next(struct snapshot_handle *handle);
extern void snapshot_write_finalize(struct snapshot_handle *handle);
extern int snapshot_image_loaded(struct snapshot_handle *handle);

/* If unset, the snapshot device cannot be open. */
extern atomic_t snapshot_device_available;

extern sector_t alloc_swapdev_block(int swap);
extern void free_all_swap_pages(int swap);
extern int swsusp_swap_in_use(void);

/*
 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
 * the image header.
 */

#define SF_PLATFORM_MODE	1

#define SF_NOCOMPRESS_MODE	2

#define SF_CRC32_MODE	        4

/* kernel/power/hibernate.c */
extern int swsusp_check(void);
extern void swsusp_free(void);
extern int swsusp_read(unsigned int *flags_p);
extern int swsusp_write(unsigned int flags);
extern void swsusp_close(fmode_t);
#ifdef CONFIG_SUSPEND
extern int swsusp_unmark(void);
#endif

struct timeval;
/* kernel/power/swsusp.c */
extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);

#ifdef CONFIG_SUSPEND
/* kernel/power/suspend.c */
extern const char * const pm_labels[];
extern const char *pm_states[];
extern const char *mem_sleep_states[];

extern int suspend_devices_and_enter(suspend_state_t state);
#else /* !CONFIG_SUSPEND */

#define mem_sleep_current	PM_SUSPEND_ON



static inline int suspend_devices_and_enter(suspend_state_t state)
{
	return -ENOSYS;
}
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#endif /* !CONFIG_SUSPEND */

#ifdef CONFIG_PM_TEST_SUSPEND
/* kernel/power/suspend_test.c */
extern void suspend_test_start(void);
extern void suspend_test_finish(const char *label);
#else /* !CONFIG_PM_TEST_SUSPEND */


static inline void suspend_test_start(void) {}
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static inline void suspend_test_finish(const char *label) {}
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#endif /* !CONFIG_PM_TEST_SUSPEND */

#ifdef CONFIG_PM_SLEEP
/* kernel/power/main.c */
extern int __pm_notifier_call_chain(unsigned long val, int nr_to_call,
				    int *nr_calls);
extern int pm_notifier_call_chain(unsigned long val);
#endif

#ifdef CONFIG_HIGHMEM
int restore_highmem(void);
#else


static inline unsigned int count_highmem_pages(void) { return 0; }
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static inline int restore_highmem(void) { return 0; }
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#endif

/*
 * Suspend test levels
 */
enum {
	/* keep first */
	
TEST_NONE,
	
TEST_CORE,
	
TEST_CPUS,
	
TEST_PLATFORM,
	
TEST_DEVICES,
	
TEST_FREEZER,
	/* keep last */
	
__TEST_AFTER_LAST
};


#define TEST_FIRST	TEST_NONE

#define TEST_MAX	(__TEST_AFTER_LAST - 1)

#ifdef CONFIG_PM_SLEEP_DEBUG
extern int pm_test_level;
#else

#define pm_test_level	(TEST_NONE)
#endif

#ifdef CONFIG_SUSPEND_FREEZER


static inline int suspend_freeze_processes(void)
{
	int error;

	error = freeze_processes();
	/*
         * freeze_processes() automatically thaws every task if freezing
         * fails. So we need not do anything extra upon error.
         */
	if (error)
		return error;

	error = freeze_kernel_threads();
	/*
         * freeze_kernel_threads() thaws only kernel threads upon freezing
         * failure. So we have to thaw the userspace tasks ourselves.
         */
	if (error)
		thaw_processes();

	return error;
}

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Johannes Berg 12 29.27% 1 25.00%
Rafael J. Wysocki 8 19.51% 2 50.00%
Total 41 100.00% 4 100.00%



static inline void suspend_thaw_processes(void)
{
	thaw_processes();
}
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#else


static inline int suspend_freeze_processes(void)
{
	return 0;
}

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static inline void suspend_thaw_processes(void)
{
}
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Total 8 100.00% 1 100.00%

#endif

#ifdef CONFIG_PM_AUTOSLEEP

/* kernel/power/autosleep.c */
extern int pm_autosleep_init(void);
extern int pm_autosleep_lock(void);
extern void pm_autosleep_unlock(void);
extern suspend_state_t pm_autosleep_state(void);
extern int pm_autosleep_set_state(suspend_state_t state);

#else /* !CONFIG_PM_AUTOSLEEP */



static inline int pm_autosleep_init(void) { return 0; }
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static inline int pm_autosleep_lock(void) { return 0; }
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static inline void pm_autosleep_unlock(void) {}
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static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }

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#endif /* !CONFIG_PM_AUTOSLEEP */

#ifdef CONFIG_PM_WAKELOCKS

/* kernel/power/wakelock.c */
extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
extern int pm_wake_lock(const char *buf);
extern int pm_wake_unlock(const char *buf);

#endif /* !CONFIG_PM_WAKELOCKS */
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Rafael J. Wysocki 689 71.62% 48 66.67%
Johannes Berg 54 5.61% 1 1.39%
Patrick Mochel 47 4.89% 3 4.17%
Adrian Bunk 38 3.95% 1 1.39%
Randy Dunlap 29 3.01% 1 1.39%
Srivatsa S. Bhat 25 2.60% 2 2.78%
Bojan Smojver 20 2.08% 3 4.17%
Lianwei Wang 16 1.66% 1 1.39%
Vivek Goyal 8 0.83% 1 1.39%
Rashika Kheria 7 0.73% 1 1.39%
Anisse Astier 7 0.73% 1 1.39%
Alan Stern 7 0.73% 1 1.39%
Gideon Israel Dsouza 4 0.42% 1 1.39%
Andrew Morton 3 0.31% 1 1.39%
Laura Abbott 2 0.21% 1 1.39%
Tina Ruchandani 2 0.21% 1 1.39%
Kay Sievers 1 0.10% 1 1.39%
Al Viro 1 0.10% 1 1.39%
Greg Kroah-Hartman 1 0.10% 1 1.39%
Jiri Slaby 1 0.10% 1 1.39%
Total 962 100.00% 72 100.00%
Directory: kernel/power

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Total	20	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.15 kernel/power/power.h

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