296699de6b
Introduce CONFIG_SUSPEND representing the ability to enter system sleep states, such as the ACPI S3 state, and allow the user to choose SUSPEND and HIBERNATION independently of each other. Make HOTPLUG_CPU be selected automatically if SUSPEND or HIBERNATION has been chosen and the kernel is intended for SMP systems. Also, introduce CONFIG_PM_SLEEP which is automatically selected if CONFIG_SUSPEND or CONFIG_HIBERNATION is set and use it to select the code needed for both suspend and hibernation. The top-level power management headers and the ACPI code related to suspend and hibernation are modified to use the new definitions (the changes in drivers/acpi/sleep/main.c are, mostly, moving code to reduce the number of ifdefs). There are many other files in which CONFIG_PM can be replaced with CONFIG_PM_SLEEP or even with CONFIG_SUSPEND, but they can be updated in the future. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
196 lines
6.3 KiB
C
196 lines
6.3 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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/*
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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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extern struct kset power_subsys;
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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_suspend(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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