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1#include <linux/suspend.h>
2#include <linux/suspend_ioctls.h>
3#include <linux/utsname.h>
4#include <linux/freezer.h>
5
6struct swsusp_info {
7 struct new_utsname uts;
8 u32 version_code;
9 unsigned long num_physpages;
10 int cpus;
11 unsigned long image_pages;
12 unsigned long pages;
13 unsigned long size;
14} __attribute__((aligned(PAGE_SIZE)));
15
16#ifdef CONFIG_HIBERNATION
17/* kernel/power/snapshot.c */
18extern void __init hibernate_reserved_size_init(void);
19extern void __init hibernate_image_size_init(void);
20
21#ifdef CONFIG_ARCH_HIBERNATION_HEADER
22/* Maximum size of architecture specific data in a hibernation header */
23#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
24
25extern int arch_hibernation_header_save(void *addr, unsigned int max_size);
26extern int arch_hibernation_header_restore(void *addr);
27
28static inline int init_header_complete(struct swsusp_info *info)
29{
30 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
31}
32
33static inline char *check_image_kernel(struct swsusp_info *info)
34{
35 return arch_hibernation_header_restore(info) ?
36 "architecture specific data" : NULL;
37}
38#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
39
40/*
41 * Keep some memory free so that I/O operations can succeed without paging
42 * [Might this be more than 4 MB?]
43 */
44#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
45
46/*
47 * Keep 1 MB of memory free so that device drivers can allocate some pages in
48 * their .suspend() routines without breaking the suspend to disk.
49 */
50#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
51
52/* kernel/power/hibernate.c */
53extern int hibernation_snapshot(int platform_mode);
54extern int hibernation_restore(int platform_mode);
55extern int hibernation_platform_enter(void);
56
57#else /* !CONFIG_HIBERNATION */
58
59static inline void hibernate_reserved_size_init(void) {}
60static inline void hibernate_image_size_init(void) {}
61#endif /* !CONFIG_HIBERNATION */
62
63extern int pfn_is_nosave(unsigned long);
64
65#define power_attr(_name) \
66static struct kobj_attribute _name##_attr = { \
67 .attr = { \
68 .name = __stringify(_name), \
69 .mode = 0644, \
70 }, \
71 .show = _name##_show, \
72 .store = _name##_store, \
73}
74
75/* Preferred image size in bytes (default 500 MB) */
76extern unsigned long image_size;
77/* Size of memory reserved for drivers (default SPARE_PAGES x PAGE_SIZE) */
78extern unsigned long reserved_size;
79extern int in_suspend;
80extern dev_t swsusp_resume_device;
81extern sector_t swsusp_resume_block;
82
83extern asmlinkage int swsusp_arch_suspend(void);
84extern asmlinkage int swsusp_arch_resume(void);
85
86extern int create_basic_memory_bitmaps(void);
87extern void free_basic_memory_bitmaps(void);
88extern int hibernate_preallocate_memory(void);
89
90/**
91 * Auxiliary structure used for reading the snapshot image data and
92 * metadata from and writing them to the list of page backup entries
93 * (PBEs) which is the main data structure of swsusp.
94 *
95 * Using struct snapshot_handle we can transfer the image, including its
96 * metadata, as a continuous sequence of bytes with the help of
97 * snapshot_read_next() and snapshot_write_next().
98 *
99 * The code that writes the image to a storage or transfers it to
100 * the user land is required to use snapshot_read_next() for this
101 * purpose and it should not make any assumptions regarding the internal
102 * structure of the image. Similarly, the code that reads the image from
103 * a storage or transfers it from the user land is required to use
104 * snapshot_write_next().
105 *
106 * This may allow us to change the internal structure of the image
107 * in the future with considerably less effort.
108 */
109
110struct snapshot_handle {
111 unsigned int cur; /* number of the block of PAGE_SIZE bytes the
112 * next operation will refer to (ie. current)
113 */
114 void *buffer; /* address of the block to read from
115 * or write to
116 */
117 int sync_read; /* Set to one to notify the caller of
118 * snapshot_write_next() that it may
119 * need to call wait_on_bio_chain()
120 */
121};
122
123/* This macro returns the address from/to which the caller of
124 * snapshot_read_next()/snapshot_write_next() is allowed to
125 * read/write data after the function returns
126 */
127#define data_of(handle) ((handle).buffer)
128
129extern unsigned int snapshot_additional_pages(struct zone *zone);
130extern unsigned long snapshot_get_image_size(void);
131extern int snapshot_read_next(struct snapshot_handle *handle);
132extern int snapshot_write_next(struct snapshot_handle *handle);
133extern void snapshot_write_finalize(struct snapshot_handle *handle);
134extern int snapshot_image_loaded(struct snapshot_handle *handle);
135
136/* If unset, the snapshot device cannot be open. */
137extern atomic_t snapshot_device_available;
138
139extern sector_t alloc_swapdev_block(int swap);
140extern void free_all_swap_pages(int swap);
141extern int swsusp_swap_in_use(void);
142
143/*
144 * Flags that can be passed from the hibernatig hernel to the "boot" kernel in
145 * the image header.
146 */
147#define SF_PLATFORM_MODE 1
148#define SF_NOCOMPRESS_MODE 2
149
150/* kernel/power/hibernate.c */
151extern int swsusp_check(void);
152extern void swsusp_free(void);
153extern int swsusp_read(unsigned int *flags_p);
154extern int swsusp_write(unsigned int flags);
155extern void swsusp_close(fmode_t);
156
157/* kernel/power/block_io.c */
158extern struct block_device *hib_resume_bdev;
159
160extern int hib_bio_read_page(pgoff_t page_off, void *addr,
161 struct bio **bio_chain);
162extern int hib_bio_write_page(pgoff_t page_off, void *addr,
163 struct bio **bio_chain);
164extern int hib_wait_on_bio_chain(struct bio **bio_chain);
165
166struct timeval;
167/* kernel/power/swsusp.c */
168extern void swsusp_show_speed(struct timeval *, struct timeval *,
169 unsigned int, char *);
170
171#ifdef CONFIG_SUSPEND
172/* kernel/power/suspend.c */
173extern const char *const pm_states[];
174
175extern bool valid_state(suspend_state_t state);
176extern int suspend_devices_and_enter(suspend_state_t state);
177extern int enter_state(suspend_state_t state);
178#else /* !CONFIG_SUSPEND */
179static inline int suspend_devices_and_enter(suspend_state_t state)
180{
181 return -ENOSYS;
182}
183static inline int enter_state(suspend_state_t state) { return -ENOSYS; }
184static inline bool valid_state(suspend_state_t state) { return false; }
185#endif /* !CONFIG_SUSPEND */
186
187#ifdef CONFIG_PM_TEST_SUSPEND
188/* kernel/power/suspend_test.c */
189extern void suspend_test_start(void);
190extern void suspend_test_finish(const char *label);
191#else /* !CONFIG_PM_TEST_SUSPEND */
192static inline void suspend_test_start(void) {}
193static inline void suspend_test_finish(const char *label) {}
194#endif /* !CONFIG_PM_TEST_SUSPEND */
195
196#ifdef CONFIG_PM_SLEEP
197/* kernel/power/main.c */
198extern int pm_notifier_call_chain(unsigned long val);
199#endif
200
201#ifdef CONFIG_HIGHMEM
202int restore_highmem(void);
203#else
204static inline unsigned int count_highmem_pages(void) { return 0; }
205static inline int restore_highmem(void) { return 0; }
206#endif
207
208/*
209 * Suspend test levels
210 */
211enum {
212 /* keep first */
213 TEST_NONE,
214 TEST_CORE,
215 TEST_CPUS,
216 TEST_PLATFORM,
217 TEST_DEVICES,
218 TEST_FREEZER,
219 /* keep last */
220 __TEST_AFTER_LAST
221};
222
223#define TEST_FIRST TEST_NONE
224#define TEST_MAX (__TEST_AFTER_LAST - 1)
225
226extern int pm_test_level;
227
228#ifdef CONFIG_SUSPEND_FREEZER
229static inline int suspend_freeze_processes(void)
230{
231 return freeze_processes();
232}
233
234static inline void suspend_thaw_processes(void)
235{
236 thaw_processes();
237}
238#else
239static inline int suspend_freeze_processes(void)
240{
241 return 0;
242}
243
244static inline void suspend_thaw_processes(void)
245{
246}
247#endif
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#include <linux/crypto.h>
10
11struct swsusp_info {
12 struct new_utsname uts;
13 u32 version_code;
14 unsigned long num_physpages;
15 int cpus;
16 unsigned long image_pages;
17 unsigned long pages;
18 unsigned long size;
19} __aligned(PAGE_SIZE);
20
21#ifdef CONFIG_HIBERNATION
22/* kernel/power/snapshot.c */
23extern void __init hibernate_reserved_size_init(void);
24extern void __init hibernate_image_size_init(void);
25
26#ifdef CONFIG_ARCH_HIBERNATION_HEADER
27/* Maximum size of architecture specific data in a hibernation header */
28#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
29
30static inline int init_header_complete(struct swsusp_info *info)
31{
32 return arch_hibernation_header_save(info, MAX_ARCH_HEADER_SIZE);
33}
34
35static inline const char *check_image_kernel(struct swsusp_info *info)
36{
37 return arch_hibernation_header_restore(info) ?
38 "architecture specific data" : NULL;
39}
40#endif /* CONFIG_ARCH_HIBERNATION_HEADER */
41
42/*
43 * Keep some memory free so that I/O operations can succeed without paging
44 * [Might this be more than 4 MB?]
45 */
46#define PAGES_FOR_IO ((4096 * 1024) >> PAGE_SHIFT)
47
48/*
49 * Keep 1 MB of memory free so that device drivers can allocate some pages in
50 * their .suspend() routines without breaking the suspend to disk.
51 */
52#define SPARE_PAGES ((1024 * 1024) >> PAGE_SHIFT)
53
54asmlinkage int swsusp_save(void);
55
56/* kernel/power/hibernate.c */
57extern bool freezer_test_done;
58extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
59
60/* kernel/power/swap.c */
61extern unsigned int swsusp_header_flags;
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);
156int 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_COMPRESSION_ALG_LZO 0 /* dummy, details given below */
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/*
177 * Bit to indicate the compression algorithm to be used(for LZ4). The same
178 * could be checked while saving/loading image to/from disk to use the
179 * corresponding algorithms.
180 *
181 * By default, LZO compression is enabled if SF_CRC32_MODE is set. Use
182 * SF_COMPRESSION_ALG_LZ4 to override this behaviour and use LZ4.
183 *
184 * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZO(dummy) -> Compression, LZO
185 * SF_CRC32_MODE, SF_COMPRESSION_ALG_LZ4 -> Compression, LZ4
186 */
187#define SF_COMPRESSION_ALG_LZ4 16
188
189/* kernel/power/hibernate.c */
190int swsusp_check(bool exclusive);
191extern void swsusp_free(void);
192extern int swsusp_read(unsigned int *flags_p);
193extern int swsusp_write(unsigned int flags);
194void swsusp_close(void);
195#ifdef CONFIG_SUSPEND
196extern int swsusp_unmark(void);
197#else
198static inline int swsusp_unmark(void) { return 0; }
199#endif
200
201struct __kernel_old_timeval;
202/* kernel/power/swsusp.c */
203extern void swsusp_show_speed(ktime_t, ktime_t, unsigned int, char *);
204
205#ifdef CONFIG_SUSPEND
206/* kernel/power/suspend.c */
207extern const char * const pm_labels[];
208extern const char *pm_states[];
209extern const char *mem_sleep_states[];
210
211extern int suspend_devices_and_enter(suspend_state_t state);
212#else /* !CONFIG_SUSPEND */
213#define mem_sleep_current PM_SUSPEND_ON
214
215static inline int suspend_devices_and_enter(suspend_state_t state)
216{
217 return -ENOSYS;
218}
219#endif /* !CONFIG_SUSPEND */
220
221#ifdef CONFIG_PM_TEST_SUSPEND
222/* kernel/power/suspend_test.c */
223extern void suspend_test_start(void);
224extern void suspend_test_finish(const char *label);
225#else /* !CONFIG_PM_TEST_SUSPEND */
226static inline void suspend_test_start(void) {}
227static inline void suspend_test_finish(const char *label) {}
228#endif /* !CONFIG_PM_TEST_SUSPEND */
229
230#ifdef CONFIG_PM_SLEEP
231/* kernel/power/main.c */
232extern int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down);
233extern int pm_notifier_call_chain(unsigned long val);
234void pm_restrict_gfp_mask(void);
235void pm_restore_gfp_mask(void);
236#else
237static inline void pm_restrict_gfp_mask(void) {}
238static inline void pm_restore_gfp_mask(void) {}
239#endif
240
241#ifdef CONFIG_HIGHMEM
242int restore_highmem(void);
243#else
244static inline unsigned int count_highmem_pages(void) { return 0; }
245static inline int restore_highmem(void) { return 0; }
246#endif
247
248/*
249 * Suspend test levels
250 */
251enum {
252 /* keep first */
253 TEST_NONE,
254 TEST_CORE,
255 TEST_CPUS,
256 TEST_PLATFORM,
257 TEST_DEVICES,
258 TEST_FREEZER,
259 /* keep last */
260 __TEST_AFTER_LAST
261};
262
263#define TEST_FIRST TEST_NONE
264#define TEST_MAX (__TEST_AFTER_LAST - 1)
265
266#ifdef CONFIG_PM_SLEEP_DEBUG
267extern int pm_test_level;
268#else
269#define pm_test_level (TEST_NONE)
270#endif
271
272#ifdef CONFIG_SUSPEND_FREEZER
273static inline int suspend_freeze_processes(void)
274{
275 int error;
276
277 error = freeze_processes();
278 /*
279 * freeze_processes() automatically thaws every task if freezing
280 * fails. So we need not do anything extra upon error.
281 */
282 if (error)
283 return error;
284
285 error = freeze_kernel_threads();
286 /*
287 * freeze_kernel_threads() thaws only kernel threads upon freezing
288 * failure. So we have to thaw the userspace tasks ourselves.
289 */
290 if (error)
291 thaw_processes();
292
293 return error;
294}
295
296static inline void suspend_thaw_processes(void)
297{
298 thaw_processes();
299}
300#else
301static inline int suspend_freeze_processes(void)
302{
303 return 0;
304}
305
306static inline void suspend_thaw_processes(void)
307{
308}
309#endif
310
311#ifdef CONFIG_PM_AUTOSLEEP
312
313/* kernel/power/autosleep.c */
314extern int pm_autosleep_init(void);
315extern int pm_autosleep_lock(void);
316extern void pm_autosleep_unlock(void);
317extern suspend_state_t pm_autosleep_state(void);
318extern int pm_autosleep_set_state(suspend_state_t state);
319
320#else /* !CONFIG_PM_AUTOSLEEP */
321
322static inline int pm_autosleep_init(void) { return 0; }
323static inline int pm_autosleep_lock(void) { return 0; }
324static inline void pm_autosleep_unlock(void) {}
325static inline suspend_state_t pm_autosleep_state(void) { return PM_SUSPEND_ON; }
326
327#endif /* !CONFIG_PM_AUTOSLEEP */
328
329#ifdef CONFIG_PM_WAKELOCKS
330
331/* kernel/power/wakelock.c */
332extern ssize_t pm_show_wakelocks(char *buf, bool show_active);
333extern int pm_wake_lock(const char *buf);
334extern int pm_wake_unlock(const char *buf);
335
336#endif /* !CONFIG_PM_WAKELOCKS */
337
338static inline int pm_sleep_disable_secondary_cpus(void)
339{
340 cpuidle_pause();
341 return suspend_disable_secondary_cpus();
342}
343
344static inline void pm_sleep_enable_secondary_cpus(void)
345{
346 suspend_enable_secondary_cpus();
347 cpuidle_resume();
348}
349
350void dpm_save_errno(int err);