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