kexec jump: save/restore device state
[linux-2.6.git] / kernel / power / power.h
1 #include <linux/suspend.h>
2 #include <linux/suspend_ioctls.h>
3 #include <linux/utsname.h>
4 #include <linux/freezer.h>
5
6 struct swsusp_info {
7         struct new_utsname      uts;
8         u32                     version_code;
9         unsigned long           num_physpages;
10         int                     cpus;
11         unsigned long           image_pages;
12         unsigned long           pages;
13         unsigned long           size;
14 } __attribute__((aligned(PAGE_SIZE)));
15
16 #ifdef CONFIG_HIBERNATION
17 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
18 /* Maximum size of architecture specific data in a hibernation header */
19 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
20
21 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
22 extern int arch_hibernation_header_restore(void *addr);
23
24 static inline int init_header_complete(struct swsusp_info *info)
25 {
26         return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
27 }
28
29 static inline char *check_image_kernel(struct swsusp_info *info)
30 {
31         return arch_hibernation_header_restore(info) ?
32                         "architecture specific data" : NULL;
33 }
34 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
35
36 /*
37  * Keep some memory free so that I/O operations can succeed without paging
38  * [Might this be more than 4 MB?]
39  */
40 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
41
42 /*
43  * Keep 1 MB of memory free so that device drivers can allocate some pages in
44  * their .suspend() routines without breaking the suspend to disk.
45  */
46 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
47
48 /* kernel/power/disk.c */
49 extern int hibernation_snapshot(int platform_mode);
50 extern int hibernation_restore(int platform_mode);
51 extern int hibernation_platform_enter(void);
52 #endif
53
54 extern int pfn_is_nosave(unsigned long);
55
56 #define power_attr(_name) \
57 static struct kobj_attribute _name##_attr = {   \
58         .attr   = {                             \
59                 .name = __stringify(_name),     \
60                 .mode = 0644,                   \
61         },                                      \
62         .show   = _name##_show,                 \
63         .store  = _name##_store,                \
64 }
65
66 /* Preferred image size in bytes (default 500 MB) */
67 extern unsigned long image_size;
68 extern int in_suspend;
69 extern dev_t swsusp_resume_device;
70 extern sector_t swsusp_resume_block;
71
72 extern asmlinkage int swsusp_arch_suspend(void);
73 extern asmlinkage int swsusp_arch_resume(void);
74
75 extern int create_basic_memory_bitmaps(void);
76 extern void free_basic_memory_bitmaps(void);
77 extern unsigned int count_data_pages(void);
78
79 /**
80  *      Auxiliary structure used for reading the snapshot image data and
81  *      metadata from and writing them to the list of page backup entries
82  *      (PBEs) which is the main data structure of swsusp.
83  *
84  *      Using struct snapshot_handle we can transfer the image, including its
85  *      metadata, as a continuous sequence of bytes with the help of
86  *      snapshot_read_next() and snapshot_write_next().
87  *
88  *      The code that writes the image to a storage or transfers it to
89  *      the user land is required to use snapshot_read_next() for this
90  *      purpose and it should not make any assumptions regarding the internal
91  *      structure of the image.  Similarly, the code that reads the image from
92  *      a storage or transfers it from the user land is required to use
93  *      snapshot_write_next().
94  *
95  *      This may allow us to change the internal structure of the image
96  *      in the future with considerably less effort.
97  */
98
99 struct snapshot_handle {
100         loff_t          offset; /* number of the last byte ready for reading
101                                  * or writing in the sequence
102                                  */
103         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
104                                  * next operation will refer to (ie. current)
105                                  */
106         unsigned int    cur_offset;     /* offset with respect to the current
107                                          * block (for the next operation)
108                                          */
109         unsigned int    prev;   /* number of the block of PAGE_SIZE bytes that
110                                  * was the current one previously
111                                  */
112         void            *buffer;        /* address of the block to read from
113                                          * or write to
114                                          */
115         unsigned int    buf_offset;     /* location to read from or write to,
116                                          * given as a displacement from 'buffer'
117                                          */
118         int             sync_read;      /* Set to one to notify the caller of
119                                          * snapshot_write_next() that it may
120                                          * need to call wait_on_bio_chain()
121                                          */
122 };
123
124 /* This macro returns the address from/to which the caller of
125  * snapshot_read_next()/snapshot_write_next() is allowed to
126  * read/write data after the function returns
127  */
128 #define data_of(handle) ((handle).buffer + (handle).buf_offset)
129
130 extern unsigned int snapshot_additional_pages(struct zone *zone);
131 extern unsigned long snapshot_get_image_size(void);
132 extern int snapshot_read_next(struct snapshot_handle *handle, size_t count);
133 extern int snapshot_write_next(struct snapshot_handle *handle, size_t count);
134 extern void snapshot_write_finalize(struct snapshot_handle *handle);
135 extern int snapshot_image_loaded(struct snapshot_handle *handle);
136
137 /* If unset, the snapshot device cannot be open. */
138 extern atomic_t snapshot_device_available;
139
140 extern sector_t alloc_swapdev_block(int swap);
141 extern void free_all_swap_pages(int swap);
142 extern int swsusp_swap_in_use(void);
143
144 /*
145  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
146  * the image header.
147  */
148 #define SF_PLATFORM_MODE        1
149
150 /* kernel/power/disk.c */
151 extern int swsusp_check(void);
152 extern int swsusp_shrink_memory(void);
153 extern void swsusp_free(void);
154 extern int swsusp_read(unsigned int *flags_p);
155 extern int swsusp_write(unsigned int flags);
156 extern void swsusp_close(void);
157
158 struct timeval;
159 /* kernel/power/swsusp.c */
160 extern void swsusp_show_speed(struct timeval *, struct timeval *,
161                                 unsigned int, char *);
162
163 #ifdef CONFIG_SUSPEND
164 /* kernel/power/main.c */
165 extern int suspend_devices_and_enter(suspend_state_t state);
166 #else /* !CONFIG_SUSPEND */
167 static inline int suspend_devices_and_enter(suspend_state_t state)
168 {
169         return -ENOSYS;
170 }
171 #endif /* !CONFIG_SUSPEND */
172
173 #ifdef CONFIG_PM_SLEEP
174 /* kernel/power/main.c */
175 extern int pm_notifier_call_chain(unsigned long val);
176 #endif
177
178 #ifdef CONFIG_HIGHMEM
179 unsigned int count_highmem_pages(void);
180 int restore_highmem(void);
181 #else
182 static inline unsigned int count_highmem_pages(void) { return 0; }
183 static inline int restore_highmem(void) { return 0; }
184 #endif
185
186 /*
187  * Suspend test levels
188  */
189 enum {
190         /* keep first */
191         TEST_NONE,
192         TEST_CORE,
193         TEST_CPUS,
194         TEST_PLATFORM,
195         TEST_DEVICES,
196         TEST_FREEZER,
197         /* keep last */
198         __TEST_AFTER_LAST
199 };
200
201 #define TEST_FIRST      TEST_NONE
202 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
203
204 extern int pm_test_level;
205
206 #ifdef CONFIG_SUSPEND_FREEZER
207 static inline int suspend_freeze_processes(void)
208 {
209         return freeze_processes();
210 }
211
212 static inline void suspend_thaw_processes(void)
213 {
214         thaw_processes();
215 }
216 #else
217 static inline int suspend_freeze_processes(void)
218 {
219         return 0;
220 }
221
222 static inline void suspend_thaw_processes(void)
223 {
224 }
225 #endif