OSDN Git Service

Merge tag 'v4.4.196' of https://shanghai.source.codeaurora.org/quic/la/kernel/msm...
[sagit-ice-cold/kernel_xiaomi_msm8998.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 #include <linux/compiler.h>
6
7 struct swsusp_info {
8         struct new_utsname      uts;
9         u32                     version_code;
10         unsigned long           num_physpages;
11         int                     cpus;
12         unsigned long           image_pages;
13         unsigned long           pages;
14         unsigned long           size;
15 } __aligned(PAGE_SIZE);
16
17 #ifdef CONFIG_HIBERNATION
18 /* kernel/power/snapshot.c */
19 extern void __init hibernate_reserved_size_init(void);
20 extern void __init hibernate_image_size_init(void);
21
22 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
23 /* Maximum size of architecture specific data in a hibernation header */
24 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
25
26 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
27 extern int arch_hibernation_header_restore(void *addr);
28
29 static inline int init_header_complete(struct swsusp_info *info)
30 {
31         return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
32 }
33
34 static inline char *check_image_kernel(struct swsusp_info *info)
35 {
36         return arch_hibernation_header_restore(info) ?
37                         "architecture specific data" : NULL;
38 }
39 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
40
41 /*
42  * Keep some memory free so that I/O operations can succeed without paging
43  * [Might this be more than 4 MB?]
44  */
45 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
46
47 /*
48  * Keep 1 MB of memory free so that device drivers can allocate some pages in
49  * their .suspend() routines without breaking the suspend to disk.
50  */
51 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
52
53 asmlinkage int swsusp_save(void);
54
55 /* kernel/power/hibernate.c */
56 extern bool freezer_test_done;
57
58 extern int hibernation_snapshot(int platform_mode);
59 extern int hibernation_restore(int platform_mode);
60 extern int hibernation_platform_enter(void);
61
62 #else /* !CONFIG_HIBERNATION */
63
64 static inline void hibernate_reserved_size_init(void) {}
65 static inline void hibernate_image_size_init(void) {}
66 #endif /* !CONFIG_HIBERNATION */
67
68 extern int pfn_is_nosave(unsigned long);
69
70 #define power_attr(_name) \
71 static struct kobj_attribute _name##_attr = {   \
72         .attr   = {                             \
73                 .name = __stringify(_name),     \
74                 .mode = 0644,                   \
75         },                                      \
76         .show   = _name##_show,                 \
77         .store  = _name##_store,                \
78 }
79
80 #define power_attr_ro(_name) \
81 static struct kobj_attribute _name##_attr = {   \
82         .attr   = {                             \
83                 .name = __stringify(_name),     \
84                 .mode = S_IRUGO,                \
85         },                                      \
86         .show   = _name##_show,                 \
87 }
88
89 /* Preferred image size in bytes (default 500 MB) */
90 extern unsigned long image_size;
91 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
92 extern unsigned long reserved_size;
93 extern int in_suspend;
94 extern dev_t swsusp_resume_device;
95 extern sector_t swsusp_resume_block;
96
97 extern int create_basic_memory_bitmaps(void);
98 extern void free_basic_memory_bitmaps(void);
99 extern int hibernate_preallocate_memory(void);
100
101 /**
102  *      Auxiliary structure used for reading the snapshot image data and
103  *      metadata from and writing them to the list of page backup entries
104  *      (PBEs) which is the main data structure of swsusp.
105  *
106  *      Using struct snapshot_handle we can transfer the image, including its
107  *      metadata, as a continuous sequence of bytes with the help of
108  *      snapshot_read_next() and snapshot_write_next().
109  *
110  *      The code that writes the image to a storage or transfers it to
111  *      the user land is required to use snapshot_read_next() for this
112  *      purpose and it should not make any assumptions regarding the internal
113  *      structure of the image.  Similarly, the code that reads the image from
114  *      a storage or transfers it from the user land is required to use
115  *      snapshot_write_next().
116  *
117  *      This may allow us to change the internal structure of the image
118  *      in the future with considerably less effort.
119  */
120
121 struct snapshot_handle {
122         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
123                                  * next operation will refer to (ie. current)
124                                  */
125         void            *buffer;        /* address of the block to read from
126                                          * or write to
127                                          */
128         int             sync_read;      /* Set to one to notify the caller of
129                                          * snapshot_write_next() that it may
130                                          * need to call wait_on_bio_chain()
131                                          */
132 };
133
134 /* This macro returns the address from/to which the caller of
135  * snapshot_read_next()/snapshot_write_next() is allowed to
136  * read/write data after the function returns
137  */
138 #define data_of(handle) ((handle).buffer)
139
140 extern unsigned int snapshot_additional_pages(struct zone *zone);
141 extern unsigned long snapshot_get_image_size(void);
142 extern int snapshot_read_next(struct snapshot_handle *handle);
143 extern int snapshot_write_next(struct snapshot_handle *handle);
144 extern void snapshot_write_finalize(struct snapshot_handle *handle);
145 extern int snapshot_image_loaded(struct snapshot_handle *handle);
146
147 /* If unset, the snapshot device cannot be open. */
148 extern atomic_t snapshot_device_available;
149
150 extern sector_t alloc_swapdev_block(int swap);
151 extern void free_all_swap_pages(int swap);
152 extern int swsusp_swap_in_use(void);
153
154 /*
155  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
156  * the image header.
157  */
158 #define SF_PLATFORM_MODE        1
159 #define SF_NOCOMPRESS_MODE      2
160 #define SF_CRC32_MODE           4
161
162 /* kernel/power/hibernate.c */
163 extern int swsusp_check(void);
164 extern void swsusp_free(void);
165 extern int swsusp_read(unsigned int *flags_p);
166 extern int swsusp_write(unsigned int flags);
167 extern void swsusp_close(fmode_t);
168 #ifdef CONFIG_SUSPEND
169 extern int swsusp_unmark(void);
170 #endif
171
172 struct timeval;
173 /* kernel/power/swsusp.c */
174 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
175
176 #ifdef CONFIG_SUSPEND
177 /* kernel/power/suspend.c */
178 extern const char *pm_labels[];
179 extern const char *pm_states[];
180
181 extern int suspend_devices_and_enter(suspend_state_t state);
182 #else /* !CONFIG_SUSPEND */
183 static inline int suspend_devices_and_enter(suspend_state_t state)
184 {
185         return -ENOSYS;
186 }
187 #endif /* !CONFIG_SUSPEND */
188
189 #ifdef CONFIG_PM_TEST_SUSPEND
190 /* kernel/power/suspend_test.c */
191 extern void suspend_test_start(void);
192 extern void suspend_test_finish(const char *label);
193 #else /* !CONFIG_PM_TEST_SUSPEND */
194 static inline void suspend_test_start(void) {}
195 static inline void suspend_test_finish(const char *label) {}
196 #endif /* !CONFIG_PM_TEST_SUSPEND */
197
198 #ifdef CONFIG_PM_SLEEP
199 /* kernel/power/main.c */
200 extern int __pm_notifier_call_chain(unsigned long val, int nr_to_call,
201                                     int *nr_calls);
202 extern int pm_notifier_call_chain(unsigned long val);
203 #endif
204
205 #ifdef CONFIG_HIGHMEM
206 int restore_highmem(void);
207 #else
208 static inline unsigned int count_highmem_pages(void) { return 0; }
209 static inline int restore_highmem(void) { return 0; }
210 #endif
211
212 /*
213  * Suspend test levels
214  */
215 enum {
216         /* keep first */
217         TEST_NONE,
218         TEST_CORE,
219         TEST_CPUS,
220         TEST_PLATFORM,
221         TEST_DEVICES,
222         TEST_FREEZER,
223         /* keep last */
224         __TEST_AFTER_LAST
225 };
226
227 #define TEST_FIRST      TEST_NONE
228 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
229
230 extern int pm_test_level;
231
232 #ifdef CONFIG_SUSPEND_FREEZER
233 static inline int suspend_freeze_processes(void)
234 {
235         int error;
236
237         error = freeze_processes();
238         /*
239          * freeze_processes() automatically thaws every task if freezing
240          * fails. So we need not do anything extra upon error.
241          */
242         if (error)
243                 return error;
244
245         error = freeze_kernel_threads();
246         /*
247          * freeze_kernel_threads() thaws only kernel threads upon freezing
248          * failure. So we have to thaw the userspace tasks ourselves.
249          */
250         if (error)
251                 thaw_processes();
252
253         return error;
254 }
255
256 static inline void suspend_thaw_processes(void)
257 {
258         thaw_processes();
259 }
260 #else
261 static inline int suspend_freeze_processes(void)
262 {
263         return 0;
264 }
265
266 static inline void suspend_thaw_processes(void)
267 {
268 }
269 #endif
270
271 #ifdef CONFIG_PM_AUTOSLEEP
272
273 /* kernel/power/autosleep.c */
274 extern int pm_autosleep_init(void);
275 extern int pm_autosleep_lock(void);
276 extern void pm_autosleep_unlock(void);
277 extern suspend_state_t pm_autosleep_state(void);
278 extern int pm_autosleep_set_state(suspend_state_t state);
279
280 #else /* !CONFIG_PM_AUTOSLEEP */
281
282 static inline int pm_autosleep_init(void) { return 0; }
283 static inline int pm_autosleep_lock(void) { return 0; }
284 static inline void pm_autosleep_unlock(void) {}
285 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
286
287 #endif /* !CONFIG_PM_AUTOSLEEP */
288
289 #ifdef CONFIG_PM_WAKELOCKS
290
291 /* kernel/power/wakelock.c */
292 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
293 extern int pm_wake_lock(const char *buf);
294 extern int pm_wake_unlock(const char *buf);
295
296 #endif /* !CONFIG_PM_WAKELOCKS */