039a5dcd2f
Dynamically create the kset instead of declaring it statically. We also rename power_subsys to power_kset to catch all users of the variable and we properly export it so that people don't have to guess that it really is present in the system. The pseries code is wierd, why is it createing /sys/power if CONFIG_PM is disabled? Oh well, stupid big boxes ignoring config options... Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
212 lines
6.9 KiB
C
212 lines
6.9 KiB
C
#include <linux/suspend.h>
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#include <linux/utsname.h>
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struct swsusp_info {
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struct new_utsname uts;
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u32 version_code;
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unsigned long num_physpages;
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int cpus;
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unsigned long image_pages;
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unsigned long pages;
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unsigned long size;
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} __attribute__((aligned(PAGE_SIZE)));
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#ifdef CONFIG_HIBERNATION
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#ifdef CONFIG_ARCH_HIBERNATION_HEADER
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/* Maximum size of architecture specific data in a hibernation header */
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#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
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extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
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extern int arch_hibernation_header_restore(void *addr);
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static inline int init_header_complete(struct swsusp_info *info)
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{
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return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
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}
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static inline char *check_image_kernel(struct swsusp_info *info)
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{
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return arch_hibernation_header_restore(info) ?
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"architecture specific data" : NULL;
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}
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#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
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/*
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* Keep some memory free so that I/O operations can succeed without paging
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* [Might this be more than 4 MB?]
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*/
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#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
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/*
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* Keep 1 MB of memory free so that device drivers can allocate some pages in
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* their .suspend() routines without breaking the suspend to disk.
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*/
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#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
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/* kernel/power/disk.c */
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extern int hibernation_snapshot(int platform_mode);
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extern int hibernation_restore(int platform_mode);
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extern int hibernation_platform_enter(void);
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#endif
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extern int pfn_is_nosave(unsigned long);
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extern struct mutex pm_mutex;
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#define power_attr(_name) \
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static struct subsys_attribute _name##_attr = { \
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.attr = { \
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.name = __stringify(_name), \
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.mode = 0644, \
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}, \
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.show = _name##_show, \
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.store = _name##_store, \
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}
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/* Preferred image size in bytes (default 500 MB) */
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extern unsigned long image_size;
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extern int in_suspend;
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extern dev_t swsusp_resume_device;
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extern sector_t swsusp_resume_block;
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extern asmlinkage int swsusp_arch_suspend(void);
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extern asmlinkage int swsusp_arch_resume(void);
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extern int create_basic_memory_bitmaps(void);
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extern void free_basic_memory_bitmaps(void);
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extern unsigned int count_data_pages(void);
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/**
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* Auxiliary structure used for reading the snapshot image data and
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* metadata from and writing them to the list of page backup entries
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* (PBEs) which is the main data structure of swsusp.
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*
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* Using struct snapshot_handle we can transfer the image, including its
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* metadata, as a continuous sequence of bytes with the help of
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* snapshot_read_next() and snapshot_write_next().
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*
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* The code that writes the image to a storage or transfers it to
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* the user land is required to use snapshot_read_next() for this
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* purpose and it should not make any assumptions regarding the internal
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* structure of the image. Similarly, the code that reads the image from
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* a storage or transfers it from the user land is required to use
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* snapshot_write_next().
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*
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* This may allow us to change the internal structure of the image
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* in the future with considerably less effort.
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*/
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struct snapshot_handle {
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loff_t offset; /* number of the last byte ready for reading
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* or writing in the sequence
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*/
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unsigned int cur; /* number of the block of PAGE_SIZE bytes the
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* next operation will refer to (ie. current)
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*/
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unsigned int cur_offset; /* offset with respect to the current
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* block (for the next operation)
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*/
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unsigned int prev; /* number of the block of PAGE_SIZE bytes that
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* was the current one previously
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*/
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void *buffer; /* address of the block to read from
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* or write to
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*/
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unsigned int buf_offset; /* location to read from or write to,
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* given as a displacement from 'buffer'
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*/
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int sync_read; /* Set to one to notify the caller of
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* snapshot_write_next() that it may
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* need to call wait_on_bio_chain()
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*/
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};
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/* This macro returns the address from/to which the caller of
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* snapshot_read_next()/snapshot_write_next() is allowed to
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* read/write data after the function returns
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*/
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#define data_of(handle) ((handle).buffer + (handle).buf_offset)
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extern unsigned int snapshot_additional_pages(struct zone *zone);
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extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
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extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
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extern void snapshot_write_finalize(struct snapshot_handle *handle);
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extern int snapshot_image_loaded(struct snapshot_handle *handle);
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/*
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* This structure is used to pass the values needed for the identification
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* of the resume swap area from a user space to the kernel via the
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* SNAPSHOT_SET_SWAP_AREA ioctl
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*/
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struct resume_swap_area {
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loff_t offset;
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u_int32_t dev;
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} __attribute__((packed));
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#define SNAPSHOT_IOC_MAGIC '3'
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#define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1)
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#define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2)
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#define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *)
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#define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4)
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#define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5)
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#define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long)
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#define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *)
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#define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *)
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#define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9)
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#define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int)
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#define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11)
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#define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int)
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#define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \
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struct resume_swap_area)
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#define SNAPSHOT_IOC_MAXNR 13
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#define PMOPS_PREPARE 1
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#define PMOPS_ENTER 2
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#define PMOPS_FINISH 3
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/* If unset, the snapshot device cannot be open. */
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extern atomic_t snapshot_device_available;
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extern sector_t alloc_swapdev_block(int swap);
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extern void free_all_swap_pages(int swap);
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extern int swsusp_swap_in_use(void);
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/*
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* Flags that can be passed from the hibernatig hernel to the "boot" kernel in
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* the image header.
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*/
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#define SF_PLATFORM_MODE 1
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/* kernel/power/disk.c */
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extern int swsusp_check(void);
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extern int swsusp_shrink_memory(void);
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extern void swsusp_free(void);
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extern int swsusp_resume(void);
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extern int swsusp_read(unsigned int *flags_p);
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extern int swsusp_write(unsigned int flags);
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extern void swsusp_close(void);
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struct timeval;
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/* kernel/power/swsusp.c */
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extern void swsusp_show_speed(struct timeval *, struct timeval *,
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unsigned int, char *);
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#ifdef CONFIG_SUSPEND
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/* kernel/power/main.c */
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extern int suspend_devices_and_enter(suspend_state_t state);
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#else /* !CONFIG_SUSPEND */
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static inline int suspend_devices_and_enter(suspend_state_t state)
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{
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return -ENOSYS;
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}
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#endif /* !CONFIG_SUSPEND */
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/* kernel/power/common.c */
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extern struct blocking_notifier_head pm_chain_head;
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static inline int pm_notifier_call_chain(unsigned long val)
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{
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return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
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== NOTIFY_BAD) ? -EINVAL : 0;
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}
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