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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #include <linux/suspend.h>
3 #include <linux/suspend_ioctls.h>
4 #include <linux/utsname.h>
5 #include <linux/freezer.h>
6 #include <linux/compiler.h>
7 #include <linux/cpu.h>
8 #include <linux/cpuidle.h>
9
10 struct swsusp_info {
11         struct new_utsname      uts;
12         u32                     version_code;
13         unsigned long           num_physpages;
14         int                     cpus;
15         unsigned long           image_pages;
16         unsigned long           pages;
17         unsigned long           size;
18 } __aligned(PAGE_SIZE);
19
20 #ifdef CONFIG_HIBERNATION
21 /* kernel/power/snapshot.c */
22 extern void __init hibernate_reserved_size_init(void);
23 extern void __init hibernate_image_size_init(void);
24
25 #ifdef CONFIG_ARCH_HIBERNATION_HEADER
26 /* Maximum size of architecture specific data in a hibernation header */
27 #define MAX_ARCH_HEADER_SIZE    (sizeof(struct new_utsname) + 4)
28
29 extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
30 extern int arch_hibernation_header_restore(void *addr);
31
32 static inline int init_header_complete(struct swsusp_info *info)
33 {
34         return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
35 }
36
37 static inline const char *check_image_kernel(struct swsusp_info *info)
38 {
39         return arch_hibernation_header_restore(info) ?
40                         "architecture specific data" : NULL;
41 }
42 #endif /* CONFIG_ARCH_HIBERNATION_HEADER */
43
44 extern int hibernate_resume_nonboot_cpu_disable(void);
45
46 /*
47  * Keep some memory free so that I/O operations can succeed without paging
48  * [Might this be more than 4 MB?]
49  */
50 #define PAGES_FOR_IO    ((4096 * 1024) >> PAGE_SHIFT)
51
52 /*
53  * Keep 1 MB of memory free so that device drivers can allocate some pages in
54  * their .suspend() routines without breaking the suspend to disk.
55  */
56 #define SPARE_PAGES     ((1024 * 1024) >> PAGE_SHIFT)
57
58 asmlinkage int swsusp_save(void);
59
60 /* kernel/power/hibernate.c */
61 extern bool freezer_test_done;
62 extern bool snapshot_test;
63
64 extern int hibernation_snapshot(int platform_mode);
65 extern int hibernation_restore(int platform_mode);
66 extern int hibernation_platform_enter(void);
67
68 #ifdef CONFIG_STRICT_KERNEL_RWX
69 /* kernel/power/snapshot.c */
70 extern void enable_restore_image_protection(void);
71 #else
72 static inline void enable_restore_image_protection(void) {}
73 #endif /* CONFIG_STRICT_KERNEL_RWX */
74
75 #else /* !CONFIG_HIBERNATION */
76
77 static inline void hibernate_reserved_size_init(void) {}
78 static inline void hibernate_image_size_init(void) {}
79 #endif /* !CONFIG_HIBERNATION */
80
81 #define power_attr(_name) \
82 static struct kobj_attribute _name##_attr = {   \
83         .attr   = {                             \
84                 .name = __stringify(_name),     \
85                 .mode = 0644,                   \
86         },                                      \
87         .show   = _name##_show,                 \
88         .store  = _name##_store,                \
89 }
90
91 #define power_attr_ro(_name) \
92 static struct kobj_attribute _name##_attr = {   \
93         .attr   = {                             \
94                 .name = __stringify(_name),     \
95                 .mode = S_IRUGO,                \
96         },                                      \
97         .show   = _name##_show,                 \
98 }
99
100 /* Preferred image size in bytes (default 500 MB) */
101 extern unsigned long image_size;
102 /* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
103 extern unsigned long reserved_size;
104 extern int in_suspend;
105 extern dev_t swsusp_resume_device;
106 extern sector_t swsusp_resume_block;
107
108 extern int create_basic_memory_bitmaps(void);
109 extern void free_basic_memory_bitmaps(void);
110 extern int hibernate_preallocate_memory(void);
111
112 extern void clear_or_poison_free_pages(void);
113
114 /**
115  *      Auxiliary structure used for reading the snapshot image data and
116  *      metadata from and writing them to the list of page backup entries
117  *      (PBEs) which is the main data structure of swsusp.
118  *
119  *      Using struct snapshot_handle we can transfer the image, including its
120  *      metadata, as a continuous sequence of bytes with the help of
121  *      snapshot_read_next() and snapshot_write_next().
122  *
123  *      The code that writes the image to a storage or transfers it to
124  *      the user land is required to use snapshot_read_next() for this
125  *      purpose and it should not make any assumptions regarding the internal
126  *      structure of the image.  Similarly, the code that reads the image from
127  *      a storage or transfers it from the user land is required to use
128  *      snapshot_write_next().
129  *
130  *      This may allow us to change the internal structure of the image
131  *      in the future with considerably less effort.
132  */
133
134 struct snapshot_handle {
135         unsigned int    cur;    /* number of the block of PAGE_SIZE bytes the
136                                  * next operation will refer to (ie. current)
137                                  */
138         void            *buffer;        /* address of the block to read from
139                                          * or write to
140                                          */
141         int             sync_read;      /* Set to one to notify the caller of
142                                          * snapshot_write_next() that it may
143                                          * need to call wait_on_bio_chain()
144                                          */
145 };
146
147 /* This macro returns the address from/to which the caller of
148  * snapshot_read_next()/snapshot_write_next() is allowed to
149  * read/write data after the function returns
150  */
151 #define data_of(handle) ((handle).buffer)
152
153 extern unsigned int snapshot_additional_pages(struct zone *zone);
154 extern unsigned long snapshot_get_image_size(void);
155 extern int snapshot_read_next(struct snapshot_handle *handle);
156 extern int snapshot_write_next(struct snapshot_handle *handle);
157 extern void snapshot_write_finalize(struct snapshot_handle *handle);
158 extern int snapshot_image_loaded(struct snapshot_handle *handle);
159
160 extern bool hibernate_acquire(void);
161 extern void hibernate_release(void);
162
163 extern sector_t alloc_swapdev_block(int swap);
164 extern void free_all_swap_pages(int swap);
165 extern int swsusp_swap_in_use(void);
166
167 /*
168  * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
169  * the image header.
170  */
171 #define SF_PLATFORM_MODE        1
172 #define SF_NOCOMPRESS_MODE      2
173 #define SF_CRC32_MODE           4
174 #define SF_HW_SIG               8
175
176 /* kernel/power/hibernate.c */
177 extern int swsusp_check(void);
178 extern void swsusp_free(void);
179 extern int swsusp_read(unsigned int *flags_p);
180 extern int swsusp_write(unsigned int flags);
181 extern void swsusp_close(fmode_t);
182 #ifdef CONFIG_SUSPEND
183 extern int swsusp_unmark(void);
184 #endif
185
186 struct __kernel_old_timeval;
187 /* kernel/power/swsusp.c */
188 extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
189
190 #ifdef CONFIG_SUSPEND
191 /* kernel/power/suspend.c */
192 extern const char * const pm_labels[];
193 extern const char *pm_states[];
194 extern const char *mem_sleep_states[];
195
196 extern int suspend_devices_and_enter(suspend_state_t state);
197 #else /* !CONFIG_SUSPEND */
198 #define mem_sleep_current       PM_SUSPEND_ON
199
200 static inline int suspend_devices_and_enter(suspend_state_t state)
201 {
202         return -ENOSYS;
203 }
204 #endif /* !CONFIG_SUSPEND */
205
206 #ifdef CONFIG_PM_TEST_SUSPEND
207 /* kernel/power/suspend_test.c */
208 extern void suspend_test_start(void);
209 extern void suspend_test_finish(const char *label);
210 #else /* !CONFIG_PM_TEST_SUSPEND */
211 static inline void suspend_test_start(void) {}
212 static inline void suspend_test_finish(const char *label) {}
213 #endif /* !CONFIG_PM_TEST_SUSPEND */
214
215 #ifdef CONFIG_PM_SLEEP
216 /* kernel/power/main.c */
217 extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
218 extern int pm_notifier_call_chain(unsigned long val);
219 void pm_restrict_gfp_mask(void);
220 void pm_restore_gfp_mask(void);
221 #else
222 static inline void pm_restrict_gfp_mask(void) {}
223 static inline void pm_restore_gfp_mask(void) {}
224 #endif
225
226 #ifdef CONFIG_HIGHMEM
227 int restore_highmem(void);
228 #else
229 static inline unsigned int count_highmem_pages(void) { return 0; }
230 static inline int restore_highmem(void) { return 0; }
231 #endif
232
233 /*
234  * Suspend test levels
235  */
236 enum {
237         /* keep first */
238         TEST_NONE,
239         TEST_CORE,
240         TEST_CPUS,
241         TEST_PLATFORM,
242         TEST_DEVICES,
243         TEST_FREEZER,
244         /* keep last */
245         __TEST_AFTER_LAST
246 };
247
248 #define TEST_FIRST      TEST_NONE
249 #define TEST_MAX        (__TEST_AFTER_LAST - 1)
250
251 #ifdef CONFIG_PM_SLEEP_DEBUG
252 extern int pm_test_level;
253 #else
254 #define pm_test_level   (TEST_NONE)
255 #endif
256
257 #ifdef CONFIG_SUSPEND_FREEZER
258 static inline int suspend_freeze_processes(void)
259 {
260         int error;
261
262         error = freeze_processes();
263         /*
264          * freeze_processes() automatically thaws every task if freezing
265          * fails. So we need not do anything extra upon error.
266          */
267         if (error)
268                 return error;
269
270         error = freeze_kernel_threads();
271         /*
272          * freeze_kernel_threads() thaws only kernel threads upon freezing
273          * failure. So we have to thaw the userspace tasks ourselves.
274          */
275         if (error)
276                 thaw_processes();
277
278         return error;
279 }
280
281 static inline void suspend_thaw_processes(void)
282 {
283         thaw_processes();
284 }
285 #else
286 static inline int suspend_freeze_processes(void)
287 {
288         return 0;
289 }
290
291 static inline void suspend_thaw_processes(void)
292 {
293 }
294 #endif
295
296 #ifdef CONFIG_PM_AUTOSLEEP
297
298 /* kernel/power/autosleep.c */
299 extern int pm_autosleep_init(void);
300 extern int pm_autosleep_lock(void);
301 extern void pm_autosleep_unlock(void);
302 extern suspend_state_t pm_autosleep_state(void);
303 extern int pm_autosleep_set_state(suspend_state_t state);
304
305 #else /* !CONFIG_PM_AUTOSLEEP */
306
307 static inline int pm_autosleep_init(void) { return 0; }
308 static inline int pm_autosleep_lock(void) { return 0; }
309 static inline void pm_autosleep_unlock(void) {}
310 static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
311
312 #endif /* !CONFIG_PM_AUTOSLEEP */
313
314 #ifdef CONFIG_PM_WAKELOCKS
315
316 /* kernel/power/wakelock.c */
317 extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
318 extern int pm_wake_lock(const char *buf);
319 extern int pm_wake_unlock(const char *buf);
320
321 #endif /* !CONFIG_PM_WAKELOCKS */
322
323 static inline int pm_sleep_disable_secondary_cpus(void)
324 {
325         cpuidle_pause();
326         return suspend_disable_secondary_cpus();
327 }
328
329 static inline void pm_sleep_enable_secondary_cpus(void)
330 {
331         suspend_enable_secondary_cpus();
332         cpuidle_resume();
333 }
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