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1da177e4 LT |
1 | #include <linux/suspend.h> |
2 | #include <linux/utsname.h> | |
3 | ||
1da177e4 LT |
4 | struct swsusp_info { |
5 | struct new_utsname uts; | |
6 | u32 version_code; | |
7 | unsigned long num_physpages; | |
8 | int cpus; | |
9 | unsigned long image_pages; | |
7088a5c0 | 10 | unsigned long pages; |
6e1819d6 | 11 | unsigned long size; |
1da177e4 LT |
12 | } __attribute__((aligned(PAGE_SIZE))); |
13 | ||
14 | ||
15 | ||
b0cb1a19 | 16 | #ifdef CONFIG_HIBERNATION |
56f99bcb RW |
17 | /* |
18 | * Keep some memory free so that I/O operations can succeed without paging | |
19 | * [Might this be more than 4 MB?] | |
20 | */ | |
21 | #define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT) | |
22 | /* | |
23 | * Keep 1 MB of memory free so that device drivers can allocate some pages in | |
24 | * their .suspend() routines without breaking the suspend to disk. | |
25 | */ | |
26 | #define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT) | |
1da177e4 | 27 | |
7777fab9 RW |
28 | /* kernel/power/disk.c */ |
29 | extern int hibernation_snapshot(int platform_mode); | |
a634cc10 | 30 | extern int hibernation_restore(int platform_mode); |
7777fab9 | 31 | extern int hibernation_platform_enter(void); |
1da177e4 | 32 | #endif |
a6d70980 | 33 | |
49c3df6a VG |
34 | extern int pfn_is_nosave(unsigned long); |
35 | ||
a6d70980 SH |
36 | extern struct mutex pm_mutex; |
37 | ||
1da177e4 LT |
38 | #define power_attr(_name) \ |
39 | static struct subsys_attribute _name##_attr = { \ | |
40 | .attr = { \ | |
41 | .name = __stringify(_name), \ | |
42 | .mode = 0644, \ | |
43 | }, \ | |
44 | .show = _name##_show, \ | |
45 | .store = _name##_store, \ | |
46 | } | |
47 | ||
823bccfc | 48 | extern struct kset power_subsys; |
1da177e4 | 49 | |
853609b6 RW |
50 | /* Preferred image size in bytes (default 500 MB) */ |
51 | extern unsigned long image_size; | |
f577eb30 | 52 | extern int in_suspend; |
61159a31 | 53 | extern dev_t swsusp_resume_device; |
9a154d9d | 54 | extern sector_t swsusp_resume_block; |
f577eb30 | 55 | |
25761b6e RW |
56 | extern asmlinkage int swsusp_arch_suspend(void); |
57 | extern asmlinkage int swsusp_arch_resume(void); | |
58 | ||
74dfd666 RW |
59 | extern int create_basic_memory_bitmaps(void); |
60 | extern void free_basic_memory_bitmaps(void); | |
72a97e08 | 61 | extern unsigned int count_data_pages(void); |
f577eb30 | 62 | |
fb13a28b RW |
63 | /** |
64 | * Auxiliary structure used for reading the snapshot image data and | |
65 | * metadata from and writing them to the list of page backup entries | |
66 | * (PBEs) which is the main data structure of swsusp. | |
67 | * | |
68 | * Using struct snapshot_handle we can transfer the image, including its | |
69 | * metadata, as a continuous sequence of bytes with the help of | |
70 | * snapshot_read_next() and snapshot_write_next(). | |
71 | * | |
72 | * The code that writes the image to a storage or transfers it to | |
73 | * the user land is required to use snapshot_read_next() for this | |
74 | * purpose and it should not make any assumptions regarding the internal | |
75 | * structure of the image. Similarly, the code that reads the image from | |
76 | * a storage or transfers it from the user land is required to use | |
77 | * snapshot_write_next(). | |
78 | * | |
79 | * This may allow us to change the internal structure of the image | |
80 | * in the future with considerably less effort. | |
81 | */ | |
82 | ||
f577eb30 | 83 | struct snapshot_handle { |
fb13a28b RW |
84 | loff_t offset; /* number of the last byte ready for reading |
85 | * or writing in the sequence | |
86 | */ | |
87 | unsigned int cur; /* number of the block of PAGE_SIZE bytes the | |
88 | * next operation will refer to (ie. current) | |
89 | */ | |
90 | unsigned int cur_offset; /* offset with respect to the current | |
91 | * block (for the next operation) | |
92 | */ | |
93 | unsigned int prev; /* number of the block of PAGE_SIZE bytes that | |
94 | * was the current one previously | |
95 | */ | |
fb13a28b RW |
96 | void *buffer; /* address of the block to read from |
97 | * or write to | |
98 | */ | |
99 | unsigned int buf_offset; /* location to read from or write to, | |
100 | * given as a displacement from 'buffer' | |
101 | */ | |
102 | int sync_read; /* Set to one to notify the caller of | |
103 | * snapshot_write_next() that it may | |
104 | * need to call wait_on_bio_chain() | |
105 | */ | |
f577eb30 RW |
106 | }; |
107 | ||
fb13a28b RW |
108 | /* This macro returns the address from/to which the caller of |
109 | * snapshot_read_next()/snapshot_write_next() is allowed to | |
110 | * read/write data after the function returns | |
111 | */ | |
f577eb30 RW |
112 | #define data_of(handle) ((handle).buffer + (handle).buf_offset) |
113 | ||
b788db79 | 114 | extern unsigned int snapshot_additional_pages(struct zone *zone); |
f577eb30 RW |
115 | extern int snapshot_read_next(struct snapshot_handle *handle, size_t count); |
116 | extern int snapshot_write_next(struct snapshot_handle *handle, size_t count); | |
8357376d | 117 | extern void snapshot_write_finalize(struct snapshot_handle *handle); |
b788db79 | 118 | extern int snapshot_image_loaded(struct snapshot_handle *handle); |
61159a31 | 119 | |
37b2ba12 RW |
120 | /* |
121 | * This structure is used to pass the values needed for the identification | |
122 | * of the resume swap area from a user space to the kernel via the | |
123 | * SNAPSHOT_SET_SWAP_AREA ioctl | |
124 | */ | |
125 | struct resume_swap_area { | |
126 | loff_t offset; | |
127 | u_int32_t dev; | |
128 | } __attribute__((packed)); | |
129 | ||
6e1819d6 RW |
130 | #define SNAPSHOT_IOC_MAGIC '3' |
131 | #define SNAPSHOT_FREEZE _IO(SNAPSHOT_IOC_MAGIC, 1) | |
132 | #define SNAPSHOT_UNFREEZE _IO(SNAPSHOT_IOC_MAGIC, 2) | |
133 | #define SNAPSHOT_ATOMIC_SNAPSHOT _IOW(SNAPSHOT_IOC_MAGIC, 3, void *) | |
134 | #define SNAPSHOT_ATOMIC_RESTORE _IO(SNAPSHOT_IOC_MAGIC, 4) | |
135 | #define SNAPSHOT_FREE _IO(SNAPSHOT_IOC_MAGIC, 5) | |
136 | #define SNAPSHOT_SET_IMAGE_SIZE _IOW(SNAPSHOT_IOC_MAGIC, 6, unsigned long) | |
137 | #define SNAPSHOT_AVAIL_SWAP _IOR(SNAPSHOT_IOC_MAGIC, 7, void *) | |
138 | #define SNAPSHOT_GET_SWAP_PAGE _IOR(SNAPSHOT_IOC_MAGIC, 8, void *) | |
139 | #define SNAPSHOT_FREE_SWAP_PAGES _IO(SNAPSHOT_IOC_MAGIC, 9) | |
140 | #define SNAPSHOT_SET_SWAP_FILE _IOW(SNAPSHOT_IOC_MAGIC, 10, unsigned int) | |
9b238205 | 141 | #define SNAPSHOT_S2RAM _IO(SNAPSHOT_IOC_MAGIC, 11) |
3592695c | 142 | #define SNAPSHOT_PMOPS _IOW(SNAPSHOT_IOC_MAGIC, 12, unsigned int) |
37b2ba12 RW |
143 | #define SNAPSHOT_SET_SWAP_AREA _IOW(SNAPSHOT_IOC_MAGIC, 13, \ |
144 | struct resume_swap_area) | |
145 | #define SNAPSHOT_IOC_MAXNR 13 | |
3592695c SS |
146 | |
147 | #define PMOPS_PREPARE 1 | |
148 | #define PMOPS_ENTER 2 | |
149 | #define PMOPS_FINISH 3 | |
6e1819d6 | 150 | |
0709db60 RW |
151 | /* If unset, the snapshot device cannot be open. */ |
152 | extern atomic_t snapshot_device_available; | |
153 | ||
d1d241cc RW |
154 | extern sector_t alloc_swapdev_block(int swap); |
155 | extern void free_all_swap_pages(int swap); | |
156 | extern int swsusp_swap_in_use(void); | |
61159a31 | 157 | |
a634cc10 RW |
158 | /* |
159 | * Flags that can be passed from the hibernatig hernel to the "boot" kernel in | |
160 | * the image header. | |
161 | */ | |
162 | #define SF_PLATFORM_MODE 1 | |
163 | ||
164 | /* kernel/power/disk.c */ | |
74c7e2ef | 165 | extern int swsusp_check(void); |
61159a31 | 166 | extern int swsusp_shrink_memory(void); |
74c7e2ef | 167 | extern void swsusp_free(void); |
61159a31 RW |
168 | extern int swsusp_suspend(void); |
169 | extern int swsusp_resume(void); | |
a634cc10 RW |
170 | extern int swsusp_read(unsigned int *flags_p); |
171 | extern int swsusp_write(unsigned int flags); | |
74c7e2ef | 172 | extern void swsusp_close(void); |
0d3a9abe RW |
173 | |
174 | struct timeval; | |
b10d9117 | 175 | /* kernel/power/swsusp.c */ |
0d3a9abe RW |
176 | extern void swsusp_show_speed(struct timeval *, struct timeval *, |
177 | unsigned int, char *); | |
b10d9117 RW |
178 | |
179 | /* kernel/power/main.c */ | |
6c961dfb RW |
180 | extern int suspend_enter(suspend_state_t state); |
181 | extern int suspend_devices_and_enter(suspend_state_t state); | |
b10d9117 RW |
182 | extern struct blocking_notifier_head pm_chain_head; |
183 | ||
184 | static inline int pm_notifier_call_chain(unsigned long val) | |
185 | { | |
186 | return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) | |
187 | == NOTIFY_BAD) ? -EINVAL : 0; | |
188 | } |