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1da177e4 | 1 | #include <linux/suspend.h> |
3010f8ca | 2 | #include <linux/suspend_ioctls.h> |
1da177e4 LT |
3 | #include <linux/utsname.h> |
4 | ||
1da177e4 LT |
5 | struct swsusp_info { |
6 | struct new_utsname uts; | |
7 | u32 version_code; | |
8 | unsigned long num_physpages; | |
9 | int cpus; | |
10 | unsigned long image_pages; | |
7088a5c0 | 11 | unsigned long pages; |
6e1819d6 | 12 | unsigned long size; |
1da177e4 LT |
13 | } __attribute__((aligned(PAGE_SIZE))); |
14 | ||
d307c4a8 RW |
15 | #ifdef CONFIG_HIBERNATION |
16 | #ifdef CONFIG_ARCH_HIBERNATION_HEADER | |
17 | /* Maximum size of architecture specific data in a hibernation header */ | |
18 | #define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4) | |
1da177e4 | 19 | |
d307c4a8 RW |
20 | extern int arch_hibernation_header_save(void *addr, unsigned int max_size); |
21 | extern int arch_hibernation_header_restore(void *addr); | |
22 | ||
23 | static inline int init_header_complete(struct swsusp_info *info) | |
24 | { | |
25 | return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE); | |
26 | } | |
27 | ||
28 | static inline char *check_image_kernel(struct swsusp_info *info) | |
29 | { | |
30 | return arch_hibernation_header_restore(info) ? | |
31 | "architecture specific data" : NULL; | |
32 | } | |
33 | #endif /* CONFIG_ARCH_HIBERNATION_HEADER */ | |
1da177e4 | 34 | |
56f99bcb RW |
35 | /* |
36 | * Keep some memory free so that I/O operations can succeed without paging | |
37 | * [Might this be more than 4 MB?] | |
38 | */ | |
39 | #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) | |
d307c4a8 | 40 | |
56f99bcb RW |
41 | /* |
42 | * Keep 1 MB of memory free so that device drivers can allocate some pages in | |
43 | * their .suspend() routines without breaking the suspend to disk. | |
44 | */ | |
45 | #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) | |
1da177e4 | 46 | |
7777fab9 RW |
47 | /* kernel/power/disk.c */ |
48 | extern int hibernation_snapshot(int platform_mode); | |
a634cc10 | 49 | extern int hibernation_restore(int platform_mode); |
7777fab9 | 50 | extern int hibernation_platform_enter(void); |
1da177e4 | 51 | #endif |
a6d70980 | 52 | |
49c3df6a VG |
53 | extern int pfn_is_nosave(unsigned long); |
54 | ||
a6d70980 SH |
55 | extern struct mutex pm_mutex; |
56 | ||
1da177e4 | 57 | #define power_attr(_name) \ |
386f275f | 58 | static struct kobj_attribute _name##_attr = { \ |
1da177e4 LT |
59 | .attr = { \ |
60 | .name = __stringify(_name), \ | |
61 | .mode = 0644, \ | |
62 | }, \ | |
63 | .show = _name##_show, \ | |
64 | .store = _name##_store, \ | |
65 | } | |
66 | ||
853609b6 RW |
67 | /* Preferred image size in bytes (default 500 MB) */ |
68 | extern unsigned long image_size; | |
f577eb30 | 69 | extern int in_suspend; |
61159a31 | 70 | extern dev_t swsusp_resume_device; |
9a154d9d | 71 | extern sector_t swsusp_resume_block; |
f577eb30 | 72 | |
25761b6e RW |
73 | extern asmlinkage int swsusp_arch_suspend(void); |
74 | extern asmlinkage int swsusp_arch_resume(void); | |
75 | ||
74dfd666 RW |
76 | extern int create_basic_memory_bitmaps(void); |
77 | extern void free_basic_memory_bitmaps(void); | |
72a97e08 | 78 | extern unsigned int count_data_pages(void); |
f577eb30 | 79 | |
fb13a28b RW |
80 | /** |
81 | * Auxiliary structure used for reading the snapshot image data and | |
82 | * metadata from and writing them to the list of page backup entries | |
83 | * (PBEs) which is the main data structure of swsusp. | |
84 | * | |
85 | * Using struct snapshot_handle we can transfer the image, including its | |
86 | * metadata, as a continuous sequence of bytes with the help of | |
87 | * snapshot_read_next() and snapshot_write_next(). | |
88 | * | |
89 | * The code that writes the image to a storage or transfers it to | |
90 | * the user land is required to use snapshot_read_next() for this | |
91 | * purpose and it should not make any assumptions regarding the internal | |
92 | * structure of the image. Similarly, the code that reads the image from | |
93 | * a storage or transfers it from the user land is required to use | |
94 | * snapshot_write_next(). | |
95 | * | |
96 | * This may allow us to change the internal structure of the image | |
97 | * in the future with considerably less effort. | |
98 | */ | |
99 | ||
f577eb30 | 100 | struct snapshot_handle { |
fb13a28b RW |
101 | loff_t offset; /* number of the last byte ready for reading |
102 | * or writing in the sequence | |
103 | */ | |
104 | unsigned int cur; /* number of the block of PAGE_SIZE bytes the | |
105 | * next operation will refer to (ie. current) | |
106 | */ | |
107 | unsigned int cur_offset; /* offset with respect to the current | |
108 | * block (for the next operation) | |
109 | */ | |
110 | unsigned int prev; /* number of the block of PAGE_SIZE bytes that | |
111 | * was the current one previously | |
112 | */ | |
fb13a28b RW |
113 | void *buffer; /* address of the block to read from |
114 | * or write to | |
115 | */ | |
116 | unsigned int buf_offset; /* location to read from or write to, | |
117 | * given as a displacement from 'buffer' | |
118 | */ | |
119 | int sync_read; /* Set to one to notify the caller of | |
120 | * snapshot_write_next() that it may | |
121 | * need to call wait_on_bio_chain() | |
122 | */ | |
f577eb30 RW |
123 | }; |
124 | ||
fb13a28b RW |
125 | /* This macro returns the address from/to which the caller of |
126 | * snapshot_read_next()/snapshot_write_next() is allowed to | |
127 | * read/write data after the function returns | |
128 | */ | |
f577eb30 RW |
129 | #define data_of(handle) ((handle).buffer + (handle).buf_offset) |
130 | ||
b788db79 | 131 | extern unsigned int snapshot_additional_pages(struct zone *zone); |
af508b34 | 132 | extern unsigned long snapshot_get_image_size(void); |
f577eb30 RW |
133 | extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); |
134 | extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); | |
8357376d | 135 | extern void snapshot_write_finalize(struct snapshot_handle *handle); |
b788db79 | 136 | extern int snapshot_image_loaded(struct snapshot_handle *handle); |
61159a31 | 137 | |
0709db60 RW |
138 | /* If unset, the snapshot device cannot be open. */ |
139 | extern atomic_t snapshot_device_available; | |
140 | ||
d1d241cc RW |
141 | extern sector_t alloc_swapdev_block(int swap); |
142 | extern void free_all_swap_pages(int swap); | |
143 | extern int swsusp_swap_in_use(void); | |
61159a31 | 144 | |
a634cc10 RW |
145 | /* |
146 | * Flags that can be passed from the hibernatig hernel to the "boot" kernel in | |
147 | * the image header. | |
148 | */ | |
149 | #define SF_PLATFORM_MODE 1 | |
150 | ||
151 | /* kernel/power/disk.c */ | |
74c7e2ef | 152 | extern int swsusp_check(void); |
61159a31 | 153 | extern int swsusp_shrink_memory(void); |
74c7e2ef | 154 | extern void swsusp_free(void); |
61159a31 | 155 | extern int swsusp_resume(void); |
a634cc10 RW |
156 | extern int swsusp_read(unsigned int *flags_p); |
157 | extern int swsusp_write(unsigned int flags); | |
74c7e2ef | 158 | extern void swsusp_close(void); |
0d3a9abe RW |
159 | |
160 | struct timeval; | |
b10d9117 | 161 | /* kernel/power/swsusp.c */ |
0d3a9abe RW |
162 | extern void swsusp_show_speed(struct timeval *, struct timeval *, |
163 | unsigned int, char *); | |
b10d9117 | 164 | |
296699de | 165 | #ifdef CONFIG_SUSPEND |
b10d9117 | 166 | /* kernel/power/main.c */ |
6c961dfb | 167 | extern int suspend_devices_and_enter(suspend_state_t state); |
296699de RW |
168 | #else /* !CONFIG_SUSPEND */ |
169 | static inline int suspend_devices_and_enter(suspend_state_t state) | |
170 | { | |
171 | return -ENOSYS; | |
172 | } | |
173 | #endif /* !CONFIG_SUSPEND */ | |
174 | ||
175 | /* kernel/power/common.c */ | |
b10d9117 RW |
176 | extern struct blocking_notifier_head pm_chain_head; |
177 | ||
178 | static inline int pm_notifier_call_chain(unsigned long val) | |
179 | { | |
180 | return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) | |
181 | == NOTIFY_BAD) ? -EINVAL : 0; | |
182 | } | |
2f8ed1c6 AB |
183 | |
184 | #ifdef CONFIG_HIGHMEM | |
185 | unsigned int count_highmem_pages(void); | |
186 | int restore_highmem(void); | |
187 | #else | |
188 | static inline unsigned int count_highmem_pages(void) { return 0; } | |
189 | static inline int restore_highmem(void) { return 0; } | |
190 | #endif | |
0e7d56e3 RW |
191 | |
192 | /* | |
193 | * Suspend test levels | |
194 | */ | |
195 | enum { | |
196 | /* keep first */ | |
197 | TEST_NONE, | |
198 | TEST_CORE, | |
199 | TEST_CPUS, | |
200 | TEST_PLATFORM, | |
201 | TEST_DEVICES, | |
202 | TEST_FREEZER, | |
203 | /* keep last */ | |
204 | __TEST_AFTER_LAST | |
205 | }; | |
206 | ||
207 | #define TEST_FIRST TEST_NONE | |
208 | #define TEST_MAX (__TEST_AFTER_LAST - 1) |