1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * kernel/power/hibernate.c - Hibernation (a.k 3 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
4 * 4 *
5 * Copyright (c) 2003 Patrick Mochel 5 * Copyright (c) 2003 Patrick Mochel
6 * Copyright (c) 2003 Open Source Development 6 * Copyright (c) 2003 Open Source Development Lab
7 * Copyright (c) 2004 Pavel Machek <pavel@ucw. 7 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
8 * Copyright (c) 2009 Rafael J. Wysocki, Novel 8 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
9 * Copyright (C) 2012 Bojan Smojver <bojan@rex 9 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
10 */ 10 */
11 11
12 #define pr_fmt(fmt) "PM: hibernation: " fmt 12 #define pr_fmt(fmt) "PM: hibernation: " fmt
13 13
14 #include <linux/blkdev.h> 14 #include <linux/blkdev.h>
15 #include <linux/export.h> 15 #include <linux/export.h>
16 #include <linux/suspend.h> 16 #include <linux/suspend.h>
17 #include <linux/reboot.h> 17 #include <linux/reboot.h>
18 #include <linux/string.h> 18 #include <linux/string.h>
19 #include <linux/device.h> 19 #include <linux/device.h>
20 #include <linux/async.h> 20 #include <linux/async.h>
21 #include <linux/delay.h> 21 #include <linux/delay.h>
22 #include <linux/fs.h> 22 #include <linux/fs.h>
23 #include <linux/mount.h> 23 #include <linux/mount.h>
24 #include <linux/pm.h> 24 #include <linux/pm.h>
25 #include <linux/nmi.h> 25 #include <linux/nmi.h>
26 #include <linux/console.h> 26 #include <linux/console.h>
27 #include <linux/cpu.h> 27 #include <linux/cpu.h>
28 #include <linux/freezer.h> 28 #include <linux/freezer.h>
29 #include <linux/gfp.h> 29 #include <linux/gfp.h>
30 #include <linux/syscore_ops.h> 30 #include <linux/syscore_ops.h>
31 #include <linux/ctype.h> 31 #include <linux/ctype.h>
32 #include <linux/ktime.h> 32 #include <linux/ktime.h>
33 #include <linux/security.h> 33 #include <linux/security.h>
34 #include <linux/secretmem.h> 34 #include <linux/secretmem.h>
35 #include <trace/events/power.h> 35 #include <trace/events/power.h>
36 36
37 #include "power.h" 37 #include "power.h"
38 38
39 39
40 static int nocompress; 40 static int nocompress;
41 static int noresume; 41 static int noresume;
42 static int nohibernate; 42 static int nohibernate;
43 static int resume_wait; 43 static int resume_wait;
44 static unsigned int resume_delay; 44 static unsigned int resume_delay;
45 static char resume_file[256] = CONFIG_PM_STD_P 45 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
46 dev_t swsusp_resume_device; 46 dev_t swsusp_resume_device;
47 sector_t swsusp_resume_block; 47 sector_t swsusp_resume_block;
48 __visible int in_suspend __nosavedata; 48 __visible int in_suspend __nosavedata;
49 49
50 static char hibernate_compressor[CRYPTO_MAX_AL 50 static char hibernate_compressor[CRYPTO_MAX_ALG_NAME] = CONFIG_HIBERNATION_DEF_COMP;
51 51
52 /* 52 /*
53 * Compression/decompression algorithm to be u 53 * Compression/decompression algorithm to be used while saving/loading
54 * image to/from disk. This would later be use 54 * image to/from disk. This would later be used in 'kernel/power/swap.c'
55 * to allocate comp streams. 55 * to allocate comp streams.
56 */ 56 */
57 char hib_comp_algo[CRYPTO_MAX_ALG_NAME]; 57 char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
58 58
59 enum { 59 enum {
60 HIBERNATION_INVALID, 60 HIBERNATION_INVALID,
61 HIBERNATION_PLATFORM, 61 HIBERNATION_PLATFORM,
62 HIBERNATION_SHUTDOWN, 62 HIBERNATION_SHUTDOWN,
63 HIBERNATION_REBOOT, 63 HIBERNATION_REBOOT,
64 #ifdef CONFIG_SUSPEND 64 #ifdef CONFIG_SUSPEND
65 HIBERNATION_SUSPEND, 65 HIBERNATION_SUSPEND,
66 #endif 66 #endif
67 HIBERNATION_TEST_RESUME, 67 HIBERNATION_TEST_RESUME,
68 /* keep last */ 68 /* keep last */
69 __HIBERNATION_AFTER_LAST 69 __HIBERNATION_AFTER_LAST
70 }; 70 };
71 #define HIBERNATION_MAX (__HIBERNATION_AFTER_L 71 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
72 #define HIBERNATION_FIRST (HIBERNATION_INVALID 72 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
73 73
74 static int hibernation_mode = HIBERNATION_SHUT 74 static int hibernation_mode = HIBERNATION_SHUTDOWN;
75 75
76 bool freezer_test_done; 76 bool freezer_test_done;
77 77
78 static const struct platform_hibernation_ops * 78 static const struct platform_hibernation_ops *hibernation_ops;
79 79
80 static atomic_t hibernate_atomic = ATOMIC_INIT 80 static atomic_t hibernate_atomic = ATOMIC_INIT(1);
81 81
82 bool hibernate_acquire(void) 82 bool hibernate_acquire(void)
83 { 83 {
84 return atomic_add_unless(&hibernate_at 84 return atomic_add_unless(&hibernate_atomic, -1, 0);
85 } 85 }
86 86
87 void hibernate_release(void) 87 void hibernate_release(void)
88 { 88 {
89 atomic_inc(&hibernate_atomic); 89 atomic_inc(&hibernate_atomic);
90 } 90 }
91 91
92 bool hibernation_available(void) 92 bool hibernation_available(void)
93 { 93 {
94 return nohibernate == 0 && 94 return nohibernate == 0 &&
95 !security_locked_down(LOCKDOWN 95 !security_locked_down(LOCKDOWN_HIBERNATION) &&
96 !secretmem_active() && !cxl_me 96 !secretmem_active() && !cxl_mem_active();
97 } 97 }
98 98
99 /** 99 /**
100 * hibernation_set_ops - Set the global hibern 100 * hibernation_set_ops - Set the global hibernate operations.
101 * @ops: Hibernation operations to use in subs 101 * @ops: Hibernation operations to use in subsequent hibernation transitions.
102 */ 102 */
103 void hibernation_set_ops(const struct platform 103 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
104 { 104 {
105 unsigned int sleep_flags; 105 unsigned int sleep_flags;
106 106
107 if (ops && !(ops->begin && ops->end && 107 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
108 && ops->prepare && ops->finish && 108 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
109 && ops->restore_cleanup && ops->le 109 && ops->restore_cleanup && ops->leave)) {
110 WARN_ON(1); 110 WARN_ON(1);
111 return; 111 return;
112 } 112 }
113 113
114 sleep_flags = lock_system_sleep(); 114 sleep_flags = lock_system_sleep();
115 115
116 hibernation_ops = ops; 116 hibernation_ops = ops;
117 if (ops) 117 if (ops)
118 hibernation_mode = HIBERNATION 118 hibernation_mode = HIBERNATION_PLATFORM;
119 else if (hibernation_mode == HIBERNATI 119 else if (hibernation_mode == HIBERNATION_PLATFORM)
120 hibernation_mode = HIBERNATION 120 hibernation_mode = HIBERNATION_SHUTDOWN;
121 121
122 unlock_system_sleep(sleep_flags); 122 unlock_system_sleep(sleep_flags);
123 } 123 }
124 EXPORT_SYMBOL_GPL(hibernation_set_ops); 124 EXPORT_SYMBOL_GPL(hibernation_set_ops);
125 125
126 static bool entering_platform_hibernation; 126 static bool entering_platform_hibernation;
127 127
128 bool system_entering_hibernation(void) 128 bool system_entering_hibernation(void)
129 { 129 {
130 return entering_platform_hibernation; 130 return entering_platform_hibernation;
131 } 131 }
132 EXPORT_SYMBOL(system_entering_hibernation); 132 EXPORT_SYMBOL(system_entering_hibernation);
133 133
134 #ifdef CONFIG_PM_DEBUG 134 #ifdef CONFIG_PM_DEBUG
135 static void hibernation_debug_sleep(void) 135 static void hibernation_debug_sleep(void)
136 { 136 {
137 pr_info("debug: Waiting for 5 seconds. 137 pr_info("debug: Waiting for 5 seconds.\n");
138 mdelay(5000); 138 mdelay(5000);
139 } 139 }
140 140
141 static int hibernation_test(int level) 141 static int hibernation_test(int level)
142 { 142 {
143 if (pm_test_level == level) { 143 if (pm_test_level == level) {
144 hibernation_debug_sleep(); 144 hibernation_debug_sleep();
145 return 1; 145 return 1;
146 } 146 }
147 return 0; 147 return 0;
148 } 148 }
149 #else /* !CONFIG_PM_DEBUG */ 149 #else /* !CONFIG_PM_DEBUG */
150 static int hibernation_test(int level) { retur 150 static int hibernation_test(int level) { return 0; }
151 #endif /* !CONFIG_PM_DEBUG */ 151 #endif /* !CONFIG_PM_DEBUG */
152 152
153 /** 153 /**
154 * platform_begin - Call platform to start hib 154 * platform_begin - Call platform to start hibernation.
155 * @platform_mode: Whether or not to use the p 155 * @platform_mode: Whether or not to use the platform driver.
156 */ 156 */
157 static int platform_begin(int platform_mode) 157 static int platform_begin(int platform_mode)
158 { 158 {
159 return (platform_mode && hibernation_o 159 return (platform_mode && hibernation_ops) ?
160 hibernation_ops->begin(PMSG_FR 160 hibernation_ops->begin(PMSG_FREEZE) : 0;
161 } 161 }
162 162
163 /** 163 /**
164 * platform_end - Call platform to finish tran 164 * platform_end - Call platform to finish transition to the working state.
165 * @platform_mode: Whether or not to use the p 165 * @platform_mode: Whether or not to use the platform driver.
166 */ 166 */
167 static void platform_end(int platform_mode) 167 static void platform_end(int platform_mode)
168 { 168 {
169 if (platform_mode && hibernation_ops) 169 if (platform_mode && hibernation_ops)
170 hibernation_ops->end(); 170 hibernation_ops->end();
171 } 171 }
172 172
173 /** 173 /**
174 * platform_pre_snapshot - Call platform to pr 174 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
175 * @platform_mode: Whether or not to use the p 175 * @platform_mode: Whether or not to use the platform driver.
176 * 176 *
177 * Use the platform driver to prepare the syst 177 * Use the platform driver to prepare the system for creating a hibernate image,
178 * if so configured, and return an error code 178 * if so configured, and return an error code if that fails.
179 */ 179 */
180 180
181 static int platform_pre_snapshot(int platform_ 181 static int platform_pre_snapshot(int platform_mode)
182 { 182 {
183 return (platform_mode && hibernation_o 183 return (platform_mode && hibernation_ops) ?
184 hibernation_ops->pre_snapshot( 184 hibernation_ops->pre_snapshot() : 0;
185 } 185 }
186 186
187 /** 187 /**
188 * platform_leave - Call platform to prepare a 188 * platform_leave - Call platform to prepare a transition to the working state.
189 * @platform_mode: Whether or not to use the p 189 * @platform_mode: Whether or not to use the platform driver.
190 * 190 *
191 * Use the platform driver prepare to prepare 191 * Use the platform driver prepare to prepare the machine for switching to the
192 * normal mode of operation. 192 * normal mode of operation.
193 * 193 *
194 * This routine is called on one CPU with inte 194 * This routine is called on one CPU with interrupts disabled.
195 */ 195 */
196 static void platform_leave(int platform_mode) 196 static void platform_leave(int platform_mode)
197 { 197 {
198 if (platform_mode && hibernation_ops) 198 if (platform_mode && hibernation_ops)
199 hibernation_ops->leave(); 199 hibernation_ops->leave();
200 } 200 }
201 201
202 /** 202 /**
203 * platform_finish - Call platform to switch t 203 * platform_finish - Call platform to switch the system to the working state.
204 * @platform_mode: Whether or not to use the p 204 * @platform_mode: Whether or not to use the platform driver.
205 * 205 *
206 * Use the platform driver to switch the machi 206 * Use the platform driver to switch the machine to the normal mode of
207 * operation. 207 * operation.
208 * 208 *
209 * This routine must be called after platform_ 209 * This routine must be called after platform_prepare().
210 */ 210 */
211 static void platform_finish(int platform_mode) 211 static void platform_finish(int platform_mode)
212 { 212 {
213 if (platform_mode && hibernation_ops) 213 if (platform_mode && hibernation_ops)
214 hibernation_ops->finish(); 214 hibernation_ops->finish();
215 } 215 }
216 216
217 /** 217 /**
218 * platform_pre_restore - Prepare for hibernat 218 * platform_pre_restore - Prepare for hibernate image restoration.
219 * @platform_mode: Whether or not to use the p 219 * @platform_mode: Whether or not to use the platform driver.
220 * 220 *
221 * Use the platform driver to prepare the syst 221 * Use the platform driver to prepare the system for resume from a hibernation
222 * image. 222 * image.
223 * 223 *
224 * If the restore fails after this function ha 224 * If the restore fails after this function has been called,
225 * platform_restore_cleanup() must be called. 225 * platform_restore_cleanup() must be called.
226 */ 226 */
227 static int platform_pre_restore(int platform_m 227 static int platform_pre_restore(int platform_mode)
228 { 228 {
229 return (platform_mode && hibernation_o 229 return (platform_mode && hibernation_ops) ?
230 hibernation_ops->pre_restore() 230 hibernation_ops->pre_restore() : 0;
231 } 231 }
232 232
233 /** 233 /**
234 * platform_restore_cleanup - Switch to the wo 234 * platform_restore_cleanup - Switch to the working state after failing restore.
235 * @platform_mode: Whether or not to use the p 235 * @platform_mode: Whether or not to use the platform driver.
236 * 236 *
237 * Use the platform driver to switch the syste 237 * Use the platform driver to switch the system to the normal mode of operation
238 * after a failing restore. 238 * after a failing restore.
239 * 239 *
240 * If platform_pre_restore() has been called b 240 * If platform_pre_restore() has been called before the failing restore, this
241 * function must be called too, regardless of 241 * function must be called too, regardless of the result of
242 * platform_pre_restore(). 242 * platform_pre_restore().
243 */ 243 */
244 static void platform_restore_cleanup(int platf 244 static void platform_restore_cleanup(int platform_mode)
245 { 245 {
246 if (platform_mode && hibernation_ops) 246 if (platform_mode && hibernation_ops)
247 hibernation_ops->restore_clean 247 hibernation_ops->restore_cleanup();
248 } 248 }
249 249
250 /** 250 /**
251 * platform_recover - Recover from a failure t 251 * platform_recover - Recover from a failure to suspend devices.
252 * @platform_mode: Whether or not to use the p 252 * @platform_mode: Whether or not to use the platform driver.
253 */ 253 */
254 static void platform_recover(int platform_mode 254 static void platform_recover(int platform_mode)
255 { 255 {
256 if (platform_mode && hibernation_ops & 256 if (platform_mode && hibernation_ops && hibernation_ops->recover)
257 hibernation_ops->recover(); 257 hibernation_ops->recover();
258 } 258 }
259 259
260 /** 260 /**
261 * swsusp_show_speed - Print time elapsed betw 261 * swsusp_show_speed - Print time elapsed between two events during hibernation.
262 * @start: Starting event. 262 * @start: Starting event.
263 * @stop: Final event. 263 * @stop: Final event.
264 * @nr_pages: Number of memory pages processed 264 * @nr_pages: Number of memory pages processed between @start and @stop.
265 * @msg: Additional diagnostic message to prin 265 * @msg: Additional diagnostic message to print.
266 */ 266 */
267 void swsusp_show_speed(ktime_t start, ktime_t 267 void swsusp_show_speed(ktime_t start, ktime_t stop,
268 unsigned nr_pages, char 268 unsigned nr_pages, char *msg)
269 { 269 {
270 ktime_t diff; 270 ktime_t diff;
271 u64 elapsed_centisecs64; 271 u64 elapsed_centisecs64;
272 unsigned int centisecs; 272 unsigned int centisecs;
273 unsigned int k; 273 unsigned int k;
274 unsigned int kps; 274 unsigned int kps;
275 275
276 diff = ktime_sub(stop, start); 276 diff = ktime_sub(stop, start);
277 elapsed_centisecs64 = ktime_divns(diff 277 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
278 centisecs = elapsed_centisecs64; 278 centisecs = elapsed_centisecs64;
279 if (centisecs == 0) 279 if (centisecs == 0)
280 centisecs = 1; /* avoid div-b 280 centisecs = 1; /* avoid div-by-zero */
281 k = nr_pages * (PAGE_SIZE / 1024); 281 k = nr_pages * (PAGE_SIZE / 1024);
282 kps = (k * 100) / centisecs; 282 kps = (k * 100) / centisecs;
283 pr_info("%s %u kbytes in %u.%02u secon 283 pr_info("%s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
284 msg, k, centisecs / 100, centi 284 msg, k, centisecs / 100, centisecs % 100, kps / 1000,
285 (kps % 1000) / 10); 285 (kps % 1000) / 10);
286 } 286 }
287 287
288 __weak int arch_resume_nosmt(void) 288 __weak int arch_resume_nosmt(void)
289 { 289 {
290 return 0; 290 return 0;
291 } 291 }
292 292
293 /** 293 /**
294 * create_image - Create a hibernation image. 294 * create_image - Create a hibernation image.
295 * @platform_mode: Whether or not to use the p 295 * @platform_mode: Whether or not to use the platform driver.
296 * 296 *
297 * Execute device drivers' "late" and "noirq" 297 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
298 * hibernation image and run the drivers' "noi 298 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
299 * 299 *
300 * Control reappears in this routine after the 300 * Control reappears in this routine after the subsequent restore.
301 */ 301 */
302 static int create_image(int platform_mode) 302 static int create_image(int platform_mode)
303 { 303 {
304 int error; 304 int error;
305 305
306 error = dpm_suspend_end(PMSG_FREEZE); 306 error = dpm_suspend_end(PMSG_FREEZE);
307 if (error) { 307 if (error) {
308 pr_err("Some devices failed to 308 pr_err("Some devices failed to power down, aborting\n");
309 return error; 309 return error;
310 } 310 }
311 311
312 error = platform_pre_snapshot(platform 312 error = platform_pre_snapshot(platform_mode);
313 if (error || hibernation_test(TEST_PLA 313 if (error || hibernation_test(TEST_PLATFORM))
314 goto Platform_finish; 314 goto Platform_finish;
315 315
316 error = pm_sleep_disable_secondary_cpu 316 error = pm_sleep_disable_secondary_cpus();
317 if (error || hibernation_test(TEST_CPU 317 if (error || hibernation_test(TEST_CPUS))
318 goto Enable_cpus; 318 goto Enable_cpus;
319 319
320 local_irq_disable(); 320 local_irq_disable();
321 321
322 system_state = SYSTEM_SUSPEND; 322 system_state = SYSTEM_SUSPEND;
323 323
324 error = syscore_suspend(); 324 error = syscore_suspend();
325 if (error) { 325 if (error) {
326 pr_err("Some system devices fa 326 pr_err("Some system devices failed to power down, aborting\n");
327 goto Enable_irqs; 327 goto Enable_irqs;
328 } 328 }
329 329
330 if (hibernation_test(TEST_CORE) || pm_ 330 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
331 goto Power_up; 331 goto Power_up;
332 332
333 in_suspend = 1; 333 in_suspend = 1;
334 save_processor_state(); 334 save_processor_state();
335 trace_suspend_resume(TPS("machine_susp 335 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
336 error = swsusp_arch_suspend(); 336 error = swsusp_arch_suspend();
337 /* Restore control flow magically appe 337 /* Restore control flow magically appears here */
338 restore_processor_state(); 338 restore_processor_state();
339 trace_suspend_resume(TPS("machine_susp 339 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
340 if (error) 340 if (error)
341 pr_err("Error %d creating imag 341 pr_err("Error %d creating image\n", error);
342 342
343 if (!in_suspend) { 343 if (!in_suspend) {
344 events_check_enabled = false; 344 events_check_enabled = false;
345 clear_or_poison_free_pages(); 345 clear_or_poison_free_pages();
346 } 346 }
347 347
348 platform_leave(platform_mode); 348 platform_leave(platform_mode);
349 349
350 Power_up: 350 Power_up:
351 syscore_resume(); 351 syscore_resume();
352 352
353 Enable_irqs: 353 Enable_irqs:
354 system_state = SYSTEM_RUNNING; 354 system_state = SYSTEM_RUNNING;
355 local_irq_enable(); 355 local_irq_enable();
356 356
357 Enable_cpus: 357 Enable_cpus:
358 pm_sleep_enable_secondary_cpus(); 358 pm_sleep_enable_secondary_cpus();
359 359
360 /* Allow architectures to do nosmt-spe 360 /* Allow architectures to do nosmt-specific post-resume dances */
361 if (!in_suspend) 361 if (!in_suspend)
362 error = arch_resume_nosmt(); 362 error = arch_resume_nosmt();
363 363
364 Platform_finish: 364 Platform_finish:
365 platform_finish(platform_mode); 365 platform_finish(platform_mode);
366 366
367 dpm_resume_start(in_suspend ? 367 dpm_resume_start(in_suspend ?
368 (error ? PMSG_RECOVER : PMSG_T 368 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
369 369
370 return error; 370 return error;
371 } 371 }
372 372
373 /** 373 /**
374 * hibernation_snapshot - Quiesce devices and 374 * hibernation_snapshot - Quiesce devices and create a hibernation image.
375 * @platform_mode: If set, use platform driver 375 * @platform_mode: If set, use platform driver to prepare for the transition.
376 * 376 *
377 * This routine must be called with system_tra 377 * This routine must be called with system_transition_mutex held.
378 */ 378 */
379 int hibernation_snapshot(int platform_mode) 379 int hibernation_snapshot(int platform_mode)
380 { 380 {
381 pm_message_t msg; 381 pm_message_t msg;
382 int error; 382 int error;
383 383
384 pm_suspend_clear_flags(); 384 pm_suspend_clear_flags();
385 error = platform_begin(platform_mode); 385 error = platform_begin(platform_mode);
386 if (error) 386 if (error)
387 goto Close; 387 goto Close;
388 388
389 /* Preallocate image memory before shu 389 /* Preallocate image memory before shutting down devices. */
390 error = hibernate_preallocate_memory() 390 error = hibernate_preallocate_memory();
391 if (error) 391 if (error)
392 goto Close; 392 goto Close;
393 393
394 error = freeze_kernel_threads(); 394 error = freeze_kernel_threads();
395 if (error) 395 if (error)
396 goto Cleanup; 396 goto Cleanup;
397 397
398 if (hibernation_test(TEST_FREEZER)) { 398 if (hibernation_test(TEST_FREEZER)) {
399 399
400 /* 400 /*
401 * Indicate to the caller that 401 * Indicate to the caller that we are returning due to a
402 * successful freezer test. 402 * successful freezer test.
403 */ 403 */
404 freezer_test_done = true; 404 freezer_test_done = true;
405 goto Thaw; 405 goto Thaw;
406 } 406 }
407 407
408 error = dpm_prepare(PMSG_FREEZE); 408 error = dpm_prepare(PMSG_FREEZE);
409 if (error) { 409 if (error) {
410 dpm_complete(PMSG_RECOVER); 410 dpm_complete(PMSG_RECOVER);
411 goto Thaw; 411 goto Thaw;
412 } 412 }
413 413
414 suspend_console(); 414 suspend_console();
415 pm_restrict_gfp_mask(); 415 pm_restrict_gfp_mask();
416 416
417 error = dpm_suspend(PMSG_FREEZE); 417 error = dpm_suspend(PMSG_FREEZE);
418 418
419 if (error || hibernation_test(TEST_DEV 419 if (error || hibernation_test(TEST_DEVICES))
420 platform_recover(platform_mode 420 platform_recover(platform_mode);
421 else 421 else
422 error = create_image(platform_ 422 error = create_image(platform_mode);
423 423
424 /* 424 /*
425 * In the case that we call create_ima 425 * In the case that we call create_image() above, the control
426 * returns here (1) after the image ha 426 * returns here (1) after the image has been created or the
427 * image creation has failed and (2) a 427 * image creation has failed and (2) after a successful restore.
428 */ 428 */
429 429
430 /* We may need to release the prealloc 430 /* We may need to release the preallocated image pages here. */
431 if (error || !in_suspend) 431 if (error || !in_suspend)
432 swsusp_free(); 432 swsusp_free();
433 433
434 msg = in_suspend ? (error ? PMSG_RECOV 434 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
435 dpm_resume(msg); 435 dpm_resume(msg);
436 436
437 if (error || !in_suspend) 437 if (error || !in_suspend)
438 pm_restore_gfp_mask(); 438 pm_restore_gfp_mask();
439 439
440 resume_console(); 440 resume_console();
441 dpm_complete(msg); 441 dpm_complete(msg);
442 442
443 Close: 443 Close:
444 platform_end(platform_mode); 444 platform_end(platform_mode);
445 return error; 445 return error;
446 446
447 Thaw: 447 Thaw:
448 thaw_kernel_threads(); 448 thaw_kernel_threads();
449 Cleanup: 449 Cleanup:
450 swsusp_free(); 450 swsusp_free();
451 goto Close; 451 goto Close;
452 } 452 }
453 453
454 int __weak hibernate_resume_nonboot_cpu_disabl 454 int __weak hibernate_resume_nonboot_cpu_disable(void)
455 { 455 {
456 return suspend_disable_secondary_cpus( 456 return suspend_disable_secondary_cpus();
457 } 457 }
458 458
459 /** 459 /**
460 * resume_target_kernel - Restore system state 460 * resume_target_kernel - Restore system state from a hibernation image.
461 * @platform_mode: Whether or not to use the p 461 * @platform_mode: Whether or not to use the platform driver.
462 * 462 *
463 * Execute device drivers' "noirq" and "late" 463 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
464 * contents of highmem that have not been rest 464 * contents of highmem that have not been restored yet from the image and run
465 * the low-level code that will restore the re 465 * the low-level code that will restore the remaining contents of memory and
466 * switch to the just restored target kernel. 466 * switch to the just restored target kernel.
467 */ 467 */
468 static int resume_target_kernel(bool platform_ 468 static int resume_target_kernel(bool platform_mode)
469 { 469 {
470 int error; 470 int error;
471 471
472 error = dpm_suspend_end(PMSG_QUIESCE); 472 error = dpm_suspend_end(PMSG_QUIESCE);
473 if (error) { 473 if (error) {
474 pr_err("Some devices failed to 474 pr_err("Some devices failed to power down, aborting resume\n");
475 return error; 475 return error;
476 } 476 }
477 477
478 error = platform_pre_restore(platform_ 478 error = platform_pre_restore(platform_mode);
479 if (error) 479 if (error)
480 goto Cleanup; 480 goto Cleanup;
481 481
482 cpuidle_pause(); 482 cpuidle_pause();
483 483
484 error = hibernate_resume_nonboot_cpu_d 484 error = hibernate_resume_nonboot_cpu_disable();
485 if (error) 485 if (error)
486 goto Enable_cpus; 486 goto Enable_cpus;
487 487
488 local_irq_disable(); 488 local_irq_disable();
489 system_state = SYSTEM_SUSPEND; 489 system_state = SYSTEM_SUSPEND;
490 490
491 error = syscore_suspend(); 491 error = syscore_suspend();
492 if (error) 492 if (error)
493 goto Enable_irqs; 493 goto Enable_irqs;
494 494
495 save_processor_state(); 495 save_processor_state();
496 error = restore_highmem(); 496 error = restore_highmem();
497 if (!error) { 497 if (!error) {
498 error = swsusp_arch_resume(); 498 error = swsusp_arch_resume();
499 /* 499 /*
500 * The code below is only ever 500 * The code below is only ever reached in case of a failure.
501 * Otherwise, execution contin 501 * Otherwise, execution continues at the place where
502 * swsusp_arch_suspend() was c 502 * swsusp_arch_suspend() was called.
503 */ 503 */
504 BUG_ON(!error); 504 BUG_ON(!error);
505 /* 505 /*
506 * This call to restore_highme 506 * This call to restore_highmem() reverts the changes made by
507 * the previous one. 507 * the previous one.
508 */ 508 */
509 restore_highmem(); 509 restore_highmem();
510 } 510 }
511 /* 511 /*
512 * The only reason why swsusp_arch_res 512 * The only reason why swsusp_arch_resume() can fail is memory being
513 * very tight, so we have to free it a 513 * very tight, so we have to free it as soon as we can to avoid
514 * subsequent failures. 514 * subsequent failures.
515 */ 515 */
516 swsusp_free(); 516 swsusp_free();
517 restore_processor_state(); 517 restore_processor_state();
518 touch_softlockup_watchdog(); 518 touch_softlockup_watchdog();
519 519
520 syscore_resume(); 520 syscore_resume();
521 521
522 Enable_irqs: 522 Enable_irqs:
523 system_state = SYSTEM_RUNNING; 523 system_state = SYSTEM_RUNNING;
524 local_irq_enable(); 524 local_irq_enable();
525 525
526 Enable_cpus: 526 Enable_cpus:
527 pm_sleep_enable_secondary_cpus(); 527 pm_sleep_enable_secondary_cpus();
528 528
529 Cleanup: 529 Cleanup:
530 platform_restore_cleanup(platform_mode 530 platform_restore_cleanup(platform_mode);
531 531
532 dpm_resume_start(PMSG_RECOVER); 532 dpm_resume_start(PMSG_RECOVER);
533 533
534 return error; 534 return error;
535 } 535 }
536 536
537 /** 537 /**
538 * hibernation_restore - Quiesce devices and r 538 * hibernation_restore - Quiesce devices and restore from a hibernation image.
539 * @platform_mode: If set, use platform driver 539 * @platform_mode: If set, use platform driver to prepare for the transition.
540 * 540 *
541 * This routine must be called with system_tra 541 * This routine must be called with system_transition_mutex held. If it is
542 * successful, control reappears in the restor 542 * successful, control reappears in the restored target kernel in
543 * hibernation_snapshot(). 543 * hibernation_snapshot().
544 */ 544 */
545 int hibernation_restore(int platform_mode) 545 int hibernation_restore(int platform_mode)
546 { 546 {
547 int error; 547 int error;
548 548
549 pm_prepare_console(); 549 pm_prepare_console();
550 suspend_console(); 550 suspend_console();
551 pm_restrict_gfp_mask(); 551 pm_restrict_gfp_mask();
552 error = dpm_suspend_start(PMSG_QUIESCE 552 error = dpm_suspend_start(PMSG_QUIESCE);
553 if (!error) { 553 if (!error) {
554 error = resume_target_kernel(p 554 error = resume_target_kernel(platform_mode);
555 /* 555 /*
556 * The above should either suc 556 * The above should either succeed and jump to the new kernel,
557 * or return with an error. Ot 557 * or return with an error. Otherwise things are just
558 * undefined, so let's be para 558 * undefined, so let's be paranoid.
559 */ 559 */
560 BUG_ON(!error); 560 BUG_ON(!error);
561 } 561 }
562 dpm_resume_end(PMSG_RECOVER); 562 dpm_resume_end(PMSG_RECOVER);
563 pm_restore_gfp_mask(); 563 pm_restore_gfp_mask();
564 resume_console(); 564 resume_console();
565 pm_restore_console(); 565 pm_restore_console();
566 return error; 566 return error;
567 } 567 }
568 568
569 /** 569 /**
570 * hibernation_platform_enter - Power off the 570 * hibernation_platform_enter - Power off the system using the platform driver.
571 */ 571 */
572 int hibernation_platform_enter(void) 572 int hibernation_platform_enter(void)
573 { 573 {
574 int error; 574 int error;
575 575
576 if (!hibernation_ops) 576 if (!hibernation_ops)
577 return -ENOSYS; 577 return -ENOSYS;
578 578
579 /* 579 /*
580 * We have cancelled the power transit 580 * We have cancelled the power transition by running
581 * hibernation_ops->finish() before sa 581 * hibernation_ops->finish() before saving the image, so we should let
582 * the firmware know that we're going 582 * the firmware know that we're going to enter the sleep state after all
583 */ 583 */
584 error = hibernation_ops->begin(PMSG_HI 584 error = hibernation_ops->begin(PMSG_HIBERNATE);
585 if (error) 585 if (error)
586 goto Close; 586 goto Close;
587 587
588 entering_platform_hibernation = true; 588 entering_platform_hibernation = true;
589 suspend_console(); 589 suspend_console();
590 error = dpm_suspend_start(PMSG_HIBERNA 590 error = dpm_suspend_start(PMSG_HIBERNATE);
591 if (error) { 591 if (error) {
592 if (hibernation_ops->recover) 592 if (hibernation_ops->recover)
593 hibernation_ops->recov 593 hibernation_ops->recover();
594 goto Resume_devices; 594 goto Resume_devices;
595 } 595 }
596 596
597 error = dpm_suspend_end(PMSG_HIBERNATE 597 error = dpm_suspend_end(PMSG_HIBERNATE);
598 if (error) 598 if (error)
599 goto Resume_devices; 599 goto Resume_devices;
600 600
601 error = hibernation_ops->prepare(); 601 error = hibernation_ops->prepare();
602 if (error) 602 if (error)
603 goto Platform_finish; 603 goto Platform_finish;
604 604
605 error = pm_sleep_disable_secondary_cpu 605 error = pm_sleep_disable_secondary_cpus();
606 if (error) 606 if (error)
607 goto Enable_cpus; 607 goto Enable_cpus;
608 608
609 local_irq_disable(); 609 local_irq_disable();
610 system_state = SYSTEM_SUSPEND; 610 system_state = SYSTEM_SUSPEND;
611 syscore_suspend(); 611 syscore_suspend();
612 if (pm_wakeup_pending()) { 612 if (pm_wakeup_pending()) {
613 error = -EAGAIN; 613 error = -EAGAIN;
614 goto Power_up; 614 goto Power_up;
615 } 615 }
616 616
617 hibernation_ops->enter(); 617 hibernation_ops->enter();
618 /* We should never get here */ 618 /* We should never get here */
619 while (1); 619 while (1);
620 620
621 Power_up: 621 Power_up:
622 syscore_resume(); 622 syscore_resume();
623 system_state = SYSTEM_RUNNING; 623 system_state = SYSTEM_RUNNING;
624 local_irq_enable(); 624 local_irq_enable();
625 625
626 Enable_cpus: 626 Enable_cpus:
627 pm_sleep_enable_secondary_cpus(); 627 pm_sleep_enable_secondary_cpus();
628 628
629 Platform_finish: 629 Platform_finish:
630 hibernation_ops->finish(); 630 hibernation_ops->finish();
631 631
632 dpm_resume_start(PMSG_RESTORE); 632 dpm_resume_start(PMSG_RESTORE);
633 633
634 Resume_devices: 634 Resume_devices:
635 entering_platform_hibernation = false; 635 entering_platform_hibernation = false;
636 dpm_resume_end(PMSG_RESTORE); 636 dpm_resume_end(PMSG_RESTORE);
637 resume_console(); 637 resume_console();
638 638
639 Close: 639 Close:
640 hibernation_ops->end(); 640 hibernation_ops->end();
641 641
642 return error; 642 return error;
643 } 643 }
644 644
645 /** 645 /**
646 * power_down - Shut the machine down for hibe 646 * power_down - Shut the machine down for hibernation.
647 * 647 *
648 * Use the platform driver, if configured, to 648 * Use the platform driver, if configured, to put the system into the sleep
649 * state corresponding to hibernation, or try 649 * state corresponding to hibernation, or try to power it off or reboot,
650 * depending on the value of hibernation_mode. 650 * depending on the value of hibernation_mode.
651 */ 651 */
652 static void power_down(void) 652 static void power_down(void)
653 { 653 {
654 int error; 654 int error;
655 655
656 #ifdef CONFIG_SUSPEND 656 #ifdef CONFIG_SUSPEND
657 if (hibernation_mode == HIBERNATION_SU 657 if (hibernation_mode == HIBERNATION_SUSPEND) {
658 error = suspend_devices_and_en 658 error = suspend_devices_and_enter(mem_sleep_current);
659 if (error) { 659 if (error) {
660 hibernation_mode = hib 660 hibernation_mode = hibernation_ops ?
661 661 HIBERNATION_PLATFORM :
662 662 HIBERNATION_SHUTDOWN;
663 } else { 663 } else {
664 /* Restore swap signat 664 /* Restore swap signature. */
665 error = swsusp_unmark( 665 error = swsusp_unmark();
666 if (error) 666 if (error)
667 pr_err("Swap w 667 pr_err("Swap will be unusable! Try swapon -a.\n");
668 668
669 return; 669 return;
670 } 670 }
671 } 671 }
672 #endif 672 #endif
673 673
674 switch (hibernation_mode) { 674 switch (hibernation_mode) {
675 case HIBERNATION_REBOOT: 675 case HIBERNATION_REBOOT:
676 kernel_restart(NULL); 676 kernel_restart(NULL);
677 break; 677 break;
678 case HIBERNATION_PLATFORM: 678 case HIBERNATION_PLATFORM:
679 error = hibernation_platform_e 679 error = hibernation_platform_enter();
680 if (error == -EAGAIN || error 680 if (error == -EAGAIN || error == -EBUSY) {
681 swsusp_unmark(); 681 swsusp_unmark();
682 events_check_enabled = 682 events_check_enabled = false;
683 pr_info("Wakeup event 683 pr_info("Wakeup event detected during hibernation, rolling back.\n");
684 return; 684 return;
685 } 685 }
686 fallthrough; 686 fallthrough;
687 case HIBERNATION_SHUTDOWN: 687 case HIBERNATION_SHUTDOWN:
688 if (kernel_can_power_off()) 688 if (kernel_can_power_off())
689 kernel_power_off(); 689 kernel_power_off();
690 break; 690 break;
691 } 691 }
692 kernel_halt(); 692 kernel_halt();
693 /* 693 /*
694 * Valid image is on the disk, if we c 694 * Valid image is on the disk, if we continue we risk serious data
695 * corruption after resume. 695 * corruption after resume.
696 */ 696 */
697 pr_crit("Power down manually\n"); 697 pr_crit("Power down manually\n");
698 while (1) 698 while (1)
699 cpu_relax(); 699 cpu_relax();
700 } 700 }
701 701
702 static int load_image_and_restore(void) 702 static int load_image_and_restore(void)
703 { 703 {
704 int error; 704 int error;
705 unsigned int flags; 705 unsigned int flags;
706 706
707 pm_pr_dbg("Loading hibernation image.\ 707 pm_pr_dbg("Loading hibernation image.\n");
708 708
709 lock_device_hotplug(); 709 lock_device_hotplug();
710 error = create_basic_memory_bitmaps(); 710 error = create_basic_memory_bitmaps();
711 if (error) { 711 if (error) {
712 swsusp_close(); 712 swsusp_close();
713 goto Unlock; 713 goto Unlock;
714 } 714 }
715 715
716 error = swsusp_read(&flags); 716 error = swsusp_read(&flags);
717 swsusp_close(); 717 swsusp_close();
718 if (!error) 718 if (!error)
719 error = hibernation_restore(fl 719 error = hibernation_restore(flags & SF_PLATFORM_MODE);
720 720
721 pr_err("Failed to load image, recoveri 721 pr_err("Failed to load image, recovering.\n");
722 swsusp_free(); 722 swsusp_free();
723 free_basic_memory_bitmaps(); 723 free_basic_memory_bitmaps();
724 Unlock: 724 Unlock:
725 unlock_device_hotplug(); 725 unlock_device_hotplug();
726 726
727 return error; 727 return error;
728 } 728 }
729 729
730 #define COMPRESSION_ALGO_LZO "lzo" 730 #define COMPRESSION_ALGO_LZO "lzo"
731 #define COMPRESSION_ALGO_LZ4 "lz4" 731 #define COMPRESSION_ALGO_LZ4 "lz4"
732 732
733 /** 733 /**
734 * hibernate - Carry out system hibernation, i 734 * hibernate - Carry out system hibernation, including saving the image.
735 */ 735 */
736 int hibernate(void) 736 int hibernate(void)
737 { 737 {
738 bool snapshot_test = false; 738 bool snapshot_test = false;
739 unsigned int sleep_flags; 739 unsigned int sleep_flags;
740 int error; 740 int error;
741 741
742 if (!hibernation_available()) { 742 if (!hibernation_available()) {
743 pm_pr_dbg("Hibernation not ava 743 pm_pr_dbg("Hibernation not available.\n");
744 return -EPERM; 744 return -EPERM;
745 } 745 }
746 746
747 /* 747 /*
748 * Query for the compression algorithm 748 * Query for the compression algorithm support if compression is enabled.
749 */ 749 */
750 if (!nocompress) { 750 if (!nocompress) {
751 strscpy(hib_comp_algo, hiberna 751 strscpy(hib_comp_algo, hibernate_compressor, sizeof(hib_comp_algo));
752 if (crypto_has_comp(hib_comp_a 752 if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) {
753 pr_err("%s compression 753 pr_err("%s compression is not available\n", hib_comp_algo);
754 return -EOPNOTSUPP; 754 return -EOPNOTSUPP;
755 } 755 }
756 } 756 }
757 757
758 sleep_flags = lock_system_sleep(); 758 sleep_flags = lock_system_sleep();
759 /* The snapshot device should not be o 759 /* The snapshot device should not be opened while we're running */
760 if (!hibernate_acquire()) { 760 if (!hibernate_acquire()) {
761 error = -EBUSY; 761 error = -EBUSY;
762 goto Unlock; 762 goto Unlock;
763 } 763 }
764 764
765 pr_info("hibernation entry\n"); 765 pr_info("hibernation entry\n");
766 pm_prepare_console(); 766 pm_prepare_console();
767 error = pm_notifier_call_chain_robust( 767 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
768 if (error) 768 if (error)
769 goto Restore; 769 goto Restore;
770 770
771 ksys_sync_helper(); 771 ksys_sync_helper();
772 772
773 error = freeze_processes(); 773 error = freeze_processes();
774 if (error) 774 if (error)
775 goto Exit; 775 goto Exit;
776 776
777 lock_device_hotplug(); 777 lock_device_hotplug();
778 /* Allocate memory management structur 778 /* Allocate memory management structures */
779 error = create_basic_memory_bitmaps(); 779 error = create_basic_memory_bitmaps();
780 if (error) 780 if (error)
781 goto Thaw; 781 goto Thaw;
782 782
783 error = hibernation_snapshot(hibernati 783 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
784 if (error || freezer_test_done) 784 if (error || freezer_test_done)
785 goto Free_bitmaps; 785 goto Free_bitmaps;
786 786
787 if (in_suspend) { 787 if (in_suspend) {
788 unsigned int flags = 0; 788 unsigned int flags = 0;
789 789
790 if (hibernation_mode == HIBERN 790 if (hibernation_mode == HIBERNATION_PLATFORM)
791 flags |= SF_PLATFORM_M 791 flags |= SF_PLATFORM_MODE;
792 if (nocompress) { 792 if (nocompress) {
793 flags |= SF_NOCOMPRESS 793 flags |= SF_NOCOMPRESS_MODE;
794 } else { 794 } else {
795 flags |= SF_CRC32_MODE 795 flags |= SF_CRC32_MODE;
796 796
797 /* 797 /*
798 * By default, LZO com 798 * By default, LZO compression is enabled. Use SF_COMPRESSION_ALG_LZ4
799 * to override this be 799 * to override this behaviour and use LZ4.
800 * 800 *
801 * Refer kernel/power/ 801 * Refer kernel/power/power.h for more details
802 */ 802 */
803 803
804 if (!strcmp(hib_comp_a 804 if (!strcmp(hib_comp_algo, COMPRESSION_ALGO_LZ4))
805 flags |= SF_CO 805 flags |= SF_COMPRESSION_ALG_LZ4;
806 else 806 else
807 flags |= SF_CO 807 flags |= SF_COMPRESSION_ALG_LZO;
808 } 808 }
809 809
810 pm_pr_dbg("Writing hibernation 810 pm_pr_dbg("Writing hibernation image.\n");
811 error = swsusp_write(flags); 811 error = swsusp_write(flags);
812 swsusp_free(); 812 swsusp_free();
813 if (!error) { 813 if (!error) {
814 if (hibernation_mode = 814 if (hibernation_mode == HIBERNATION_TEST_RESUME)
815 snapshot_test 815 snapshot_test = true;
816 else 816 else
817 power_down(); 817 power_down();
818 } 818 }
819 in_suspend = 0; 819 in_suspend = 0;
820 pm_restore_gfp_mask(); 820 pm_restore_gfp_mask();
821 } else { 821 } else {
822 pm_pr_dbg("Hibernation image r 822 pm_pr_dbg("Hibernation image restored successfully.\n");
823 } 823 }
824 824
825 Free_bitmaps: 825 Free_bitmaps:
826 free_basic_memory_bitmaps(); 826 free_basic_memory_bitmaps();
827 Thaw: 827 Thaw:
828 unlock_device_hotplug(); 828 unlock_device_hotplug();
829 if (snapshot_test) { 829 if (snapshot_test) {
830 pm_pr_dbg("Checking hibernatio 830 pm_pr_dbg("Checking hibernation image\n");
831 error = swsusp_check(false); 831 error = swsusp_check(false);
832 if (!error) 832 if (!error)
833 error = load_image_and 833 error = load_image_and_restore();
834 } 834 }
835 thaw_processes(); 835 thaw_processes();
836 836
837 /* Don't bother checking whether freez 837 /* Don't bother checking whether freezer_test_done is true */
838 freezer_test_done = false; 838 freezer_test_done = false;
839 Exit: 839 Exit:
840 pm_notifier_call_chain(PM_POST_HIBERNA 840 pm_notifier_call_chain(PM_POST_HIBERNATION);
841 Restore: 841 Restore:
842 pm_restore_console(); 842 pm_restore_console();
843 hibernate_release(); 843 hibernate_release();
844 Unlock: 844 Unlock:
845 unlock_system_sleep(sleep_flags); 845 unlock_system_sleep(sleep_flags);
846 pr_info("hibernation exit\n"); 846 pr_info("hibernation exit\n");
847 847
848 return error; 848 return error;
849 } 849 }
850 850
851 /** 851 /**
852 * hibernate_quiet_exec - Execute a function w 852 * hibernate_quiet_exec - Execute a function with all devices frozen.
853 * @func: Function to execute. 853 * @func: Function to execute.
854 * @data: Data pointer to pass to @func. 854 * @data: Data pointer to pass to @func.
855 * 855 *
856 * Return the @func return value or an error c 856 * Return the @func return value or an error code if it cannot be executed.
857 */ 857 */
858 int hibernate_quiet_exec(int (*func)(void *dat 858 int hibernate_quiet_exec(int (*func)(void *data), void *data)
859 { 859 {
860 unsigned int sleep_flags; 860 unsigned int sleep_flags;
861 int error; 861 int error;
862 862
863 sleep_flags = lock_system_sleep(); 863 sleep_flags = lock_system_sleep();
864 864
865 if (!hibernate_acquire()) { 865 if (!hibernate_acquire()) {
866 error = -EBUSY; 866 error = -EBUSY;
867 goto unlock; 867 goto unlock;
868 } 868 }
869 869
870 pm_prepare_console(); 870 pm_prepare_console();
871 871
872 error = pm_notifier_call_chain_robust( 872 error = pm_notifier_call_chain_robust(PM_HIBERNATION_PREPARE, PM_POST_HIBERNATION);
873 if (error) 873 if (error)
874 goto restore; 874 goto restore;
875 875
876 error = freeze_processes(); 876 error = freeze_processes();
877 if (error) 877 if (error)
878 goto exit; 878 goto exit;
879 879
880 lock_device_hotplug(); 880 lock_device_hotplug();
881 881
882 pm_suspend_clear_flags(); 882 pm_suspend_clear_flags();
883 883
884 error = platform_begin(true); 884 error = platform_begin(true);
885 if (error) 885 if (error)
886 goto thaw; 886 goto thaw;
887 887
888 error = freeze_kernel_threads(); 888 error = freeze_kernel_threads();
889 if (error) 889 if (error)
890 goto thaw; 890 goto thaw;
891 891
892 error = dpm_prepare(PMSG_FREEZE); 892 error = dpm_prepare(PMSG_FREEZE);
893 if (error) 893 if (error)
894 goto dpm_complete; 894 goto dpm_complete;
895 895
896 suspend_console(); 896 suspend_console();
897 897
898 error = dpm_suspend(PMSG_FREEZE); 898 error = dpm_suspend(PMSG_FREEZE);
899 if (error) 899 if (error)
900 goto dpm_resume; 900 goto dpm_resume;
901 901
902 error = dpm_suspend_end(PMSG_FREEZE); 902 error = dpm_suspend_end(PMSG_FREEZE);
903 if (error) 903 if (error)
904 goto dpm_resume; 904 goto dpm_resume;
905 905
906 error = platform_pre_snapshot(true); 906 error = platform_pre_snapshot(true);
907 if (error) 907 if (error)
908 goto skip; 908 goto skip;
909 909
910 error = func(data); 910 error = func(data);
911 911
912 skip: 912 skip:
913 platform_finish(true); 913 platform_finish(true);
914 914
915 dpm_resume_start(PMSG_THAW); 915 dpm_resume_start(PMSG_THAW);
916 916
917 dpm_resume: 917 dpm_resume:
918 dpm_resume(PMSG_THAW); 918 dpm_resume(PMSG_THAW);
919 919
920 resume_console(); 920 resume_console();
921 921
922 dpm_complete: 922 dpm_complete:
923 dpm_complete(PMSG_THAW); 923 dpm_complete(PMSG_THAW);
924 924
925 thaw_kernel_threads(); 925 thaw_kernel_threads();
926 926
927 thaw: 927 thaw:
928 platform_end(true); 928 platform_end(true);
929 929
930 unlock_device_hotplug(); 930 unlock_device_hotplug();
931 931
932 thaw_processes(); 932 thaw_processes();
933 933
934 exit: 934 exit:
935 pm_notifier_call_chain(PM_POST_HIBERNA 935 pm_notifier_call_chain(PM_POST_HIBERNATION);
936 936
937 restore: 937 restore:
938 pm_restore_console(); 938 pm_restore_console();
939 939
940 hibernate_release(); 940 hibernate_release();
941 941
942 unlock: 942 unlock:
943 unlock_system_sleep(sleep_flags); 943 unlock_system_sleep(sleep_flags);
944 944
945 return error; 945 return error;
946 } 946 }
947 EXPORT_SYMBOL_GPL(hibernate_quiet_exec); 947 EXPORT_SYMBOL_GPL(hibernate_quiet_exec);
948 948
949 static int __init find_resume_device(void) 949 static int __init find_resume_device(void)
950 { 950 {
951 if (!strlen(resume_file)) 951 if (!strlen(resume_file))
952 return -ENOENT; 952 return -ENOENT;
953 953
954 pm_pr_dbg("Checking hibernation image 954 pm_pr_dbg("Checking hibernation image partition %s\n", resume_file);
955 955
956 if (resume_delay) { 956 if (resume_delay) {
957 pr_info("Waiting %dsec before 957 pr_info("Waiting %dsec before reading resume device ...\n",
958 resume_delay); 958 resume_delay);
959 ssleep(resume_delay); 959 ssleep(resume_delay);
960 } 960 }
961 961
962 /* Check if the device is there */ 962 /* Check if the device is there */
963 if (!early_lookup_bdev(resume_file, &s 963 if (!early_lookup_bdev(resume_file, &swsusp_resume_device))
964 return 0; 964 return 0;
965 965
966 /* 966 /*
967 * Some device discovery might still b 967 * Some device discovery might still be in progress; we need to wait for
968 * this to finish. 968 * this to finish.
969 */ 969 */
970 wait_for_device_probe(); 970 wait_for_device_probe();
971 if (resume_wait) { 971 if (resume_wait) {
972 while (early_lookup_bdev(resum 972 while (early_lookup_bdev(resume_file, &swsusp_resume_device))
973 msleep(10); 973 msleep(10);
974 async_synchronize_full(); 974 async_synchronize_full();
975 } 975 }
976 976
977 return early_lookup_bdev(resume_file, 977 return early_lookup_bdev(resume_file, &swsusp_resume_device);
978 } 978 }
979 979
980 static int software_resume(void) 980 static int software_resume(void)
981 { 981 {
982 int error; 982 int error;
983 983
984 pm_pr_dbg("Hibernation image partition 984 pm_pr_dbg("Hibernation image partition %d:%d present\n",
985 MAJOR(swsusp_resume_device), M 985 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
986 986
987 pm_pr_dbg("Looking for hibernation ima 987 pm_pr_dbg("Looking for hibernation image.\n");
988 988
989 mutex_lock(&system_transition_mutex); 989 mutex_lock(&system_transition_mutex);
990 error = swsusp_check(true); 990 error = swsusp_check(true);
991 if (error) 991 if (error)
992 goto Unlock; 992 goto Unlock;
993 993
994 /* 994 /*
995 * Check if the hibernation image is c 995 * Check if the hibernation image is compressed. If so, query for
996 * the algorithm support. 996 * the algorithm support.
997 */ 997 */
998 if (!(swsusp_header_flags & SF_NOCOMPR 998 if (!(swsusp_header_flags & SF_NOCOMPRESS_MODE)) {
999 if (swsusp_header_flags & SF_C 999 if (swsusp_header_flags & SF_COMPRESSION_ALG_LZ4)
1000 strscpy(hib_comp_algo 1000 strscpy(hib_comp_algo, COMPRESSION_ALGO_LZ4, sizeof(hib_comp_algo));
1001 else 1001 else
1002 strscpy(hib_comp_algo 1002 strscpy(hib_comp_algo, COMPRESSION_ALGO_LZO, sizeof(hib_comp_algo));
1003 if (crypto_has_comp(hib_comp_ 1003 if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) {
1004 pr_err("%s compressio 1004 pr_err("%s compression is not available\n", hib_comp_algo);
1005 error = -EOPNOTSUPP; 1005 error = -EOPNOTSUPP;
1006 goto Unlock; 1006 goto Unlock;
1007 } 1007 }
1008 } 1008 }
1009 1009
1010 /* The snapshot device should not be 1010 /* The snapshot device should not be opened while we're running */
1011 if (!hibernate_acquire()) { 1011 if (!hibernate_acquire()) {
1012 error = -EBUSY; 1012 error = -EBUSY;
1013 swsusp_close(); 1013 swsusp_close();
1014 goto Unlock; 1014 goto Unlock;
1015 } 1015 }
1016 1016
1017 pr_info("resume from hibernation\n"); 1017 pr_info("resume from hibernation\n");
1018 pm_prepare_console(); 1018 pm_prepare_console();
1019 error = pm_notifier_call_chain_robust 1019 error = pm_notifier_call_chain_robust(PM_RESTORE_PREPARE, PM_POST_RESTORE);
1020 if (error) 1020 if (error)
1021 goto Restore; 1021 goto Restore;
1022 1022
1023 pm_pr_dbg("Preparing processes for hi 1023 pm_pr_dbg("Preparing processes for hibernation restore.\n");
1024 error = freeze_processes(); 1024 error = freeze_processes();
1025 if (error) 1025 if (error)
1026 goto Close_Finish; 1026 goto Close_Finish;
1027 1027
1028 error = freeze_kernel_threads(); 1028 error = freeze_kernel_threads();
1029 if (error) { 1029 if (error) {
1030 thaw_processes(); 1030 thaw_processes();
1031 goto Close_Finish; 1031 goto Close_Finish;
1032 } 1032 }
1033 1033
1034 error = load_image_and_restore(); 1034 error = load_image_and_restore();
1035 thaw_processes(); 1035 thaw_processes();
1036 Finish: 1036 Finish:
1037 pm_notifier_call_chain(PM_POST_RESTOR 1037 pm_notifier_call_chain(PM_POST_RESTORE);
1038 Restore: 1038 Restore:
1039 pm_restore_console(); 1039 pm_restore_console();
1040 pr_info("resume failed (%d)\n", error 1040 pr_info("resume failed (%d)\n", error);
1041 hibernate_release(); 1041 hibernate_release();
1042 /* For success case, the suspend path 1042 /* For success case, the suspend path will release the lock */
1043 Unlock: 1043 Unlock:
1044 mutex_unlock(&system_transition_mutex 1044 mutex_unlock(&system_transition_mutex);
1045 pm_pr_dbg("Hibernation image not pres 1045 pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
1046 return error; 1046 return error;
1047 Close_Finish: 1047 Close_Finish:
1048 swsusp_close(); 1048 swsusp_close();
1049 goto Finish; 1049 goto Finish;
1050 } 1050 }
1051 1051
1052 /** 1052 /**
1053 * software_resume_initcall - Resume from a s 1053 * software_resume_initcall - Resume from a saved hibernation image.
1054 * 1054 *
1055 * This routine is called as a late initcall, 1055 * This routine is called as a late initcall, when all devices have been
1056 * discovered and initialized already. 1056 * discovered and initialized already.
1057 * 1057 *
1058 * The image reading code is called to see if 1058 * The image reading code is called to see if there is a hibernation image
1059 * available for reading. If that is the cas 1059 * available for reading. If that is the case, devices are quiesced and the
1060 * contents of memory is restored from the sa 1060 * contents of memory is restored from the saved image.
1061 * 1061 *
1062 * If this is successful, control reappears i 1062 * If this is successful, control reappears in the restored target kernel in
1063 * hibernation_snapshot() which returns to hi 1063 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
1064 * attempts to recover gracefully and make th 1064 * attempts to recover gracefully and make the kernel return to the normal mode
1065 * of operation. 1065 * of operation.
1066 */ 1066 */
1067 static int __init software_resume_initcall(vo 1067 static int __init software_resume_initcall(void)
1068 { 1068 {
1069 /* 1069 /*
1070 * If the user said "noresume".. bail 1070 * If the user said "noresume".. bail out early.
1071 */ 1071 */
1072 if (noresume || !hibernation_availabl 1072 if (noresume || !hibernation_available())
1073 return 0; 1073 return 0;
1074 1074
1075 if (!swsusp_resume_device) { 1075 if (!swsusp_resume_device) {
1076 int error = find_resume_devic 1076 int error = find_resume_device();
1077 1077
1078 if (error) 1078 if (error)
1079 return error; 1079 return error;
1080 } 1080 }
1081 1081
1082 return software_resume(); 1082 return software_resume();
1083 } 1083 }
1084 late_initcall_sync(software_resume_initcall); 1084 late_initcall_sync(software_resume_initcall);
1085 1085
1086 1086
1087 static const char * const hibernation_modes[] 1087 static const char * const hibernation_modes[] = {
1088 [HIBERNATION_PLATFORM] = "platform", 1088 [HIBERNATION_PLATFORM] = "platform",
1089 [HIBERNATION_SHUTDOWN] = "shutdown", 1089 [HIBERNATION_SHUTDOWN] = "shutdown",
1090 [HIBERNATION_REBOOT] = "reboot", 1090 [HIBERNATION_REBOOT] = "reboot",
1091 #ifdef CONFIG_SUSPEND 1091 #ifdef CONFIG_SUSPEND
1092 [HIBERNATION_SUSPEND] = "suspend", 1092 [HIBERNATION_SUSPEND] = "suspend",
1093 #endif 1093 #endif
1094 [HIBERNATION_TEST_RESUME] = "te 1094 [HIBERNATION_TEST_RESUME] = "test_resume",
1095 }; 1095 };
1096 1096
1097 /* 1097 /*
1098 * /sys/power/disk - Control hibernation mode 1098 * /sys/power/disk - Control hibernation mode.
1099 * 1099 *
1100 * Hibernation can be handled in several ways 1100 * Hibernation can be handled in several ways. There are a few different ways
1101 * to put the system into the sleep state: us 1101 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1102 * or other hibernation_ops), powering it off 1102 * or other hibernation_ops), powering it off or rebooting it (for testing
1103 * mostly). 1103 * mostly).
1104 * 1104 *
1105 * The sysfs file /sys/power/disk provides an 1105 * The sysfs file /sys/power/disk provides an interface for selecting the
1106 * hibernation mode to use. Reading from thi 1106 * hibernation mode to use. Reading from this file causes the available modes
1107 * to be printed. There are 3 modes that can 1107 * to be printed. There are 3 modes that can be supported:
1108 * 1108 *
1109 * 'platform' 1109 * 'platform'
1110 * 'shutdown' 1110 * 'shutdown'
1111 * 'reboot' 1111 * 'reboot'
1112 * 1112 *
1113 * If a platform hibernation driver is in use 1113 * If a platform hibernation driver is in use, 'platform' will be supported
1114 * and will be used by default. Otherwise, ' 1114 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1115 * The selected option (i.e. the one correspo 1115 * The selected option (i.e. the one corresponding to the current value of
1116 * hibernation_mode) is enclosed by a square 1116 * hibernation_mode) is enclosed by a square bracket.
1117 * 1117 *
1118 * To select a given hibernation mode it is n 1118 * To select a given hibernation mode it is necessary to write the mode's
1119 * string representation (as returned by read 1119 * string representation (as returned by reading from /sys/power/disk) back
1120 * into /sys/power/disk. 1120 * into /sys/power/disk.
1121 */ 1121 */
1122 1122
1123 static ssize_t disk_show(struct kobject *kobj 1123 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1124 char *buf) 1124 char *buf)
1125 { 1125 {
1126 ssize_t count = 0; <<
1127 int i; 1126 int i;
>> 1127 char *start = buf;
1128 1128
1129 if (!hibernation_available()) 1129 if (!hibernation_available())
1130 return sysfs_emit(buf, "[disa !! 1130 return sprintf(buf, "[disabled]\n");
1131 1131
1132 for (i = HIBERNATION_FIRST; i <= HIBE 1132 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1133 if (!hibernation_modes[i]) 1133 if (!hibernation_modes[i])
1134 continue; 1134 continue;
1135 switch (i) { 1135 switch (i) {
1136 case HIBERNATION_SHUTDOWN: 1136 case HIBERNATION_SHUTDOWN:
1137 case HIBERNATION_REBOOT: 1137 case HIBERNATION_REBOOT:
1138 #ifdef CONFIG_SUSPEND 1138 #ifdef CONFIG_SUSPEND
1139 case HIBERNATION_SUSPEND: 1139 case HIBERNATION_SUSPEND:
1140 #endif 1140 #endif
1141 case HIBERNATION_TEST_RESUME: 1141 case HIBERNATION_TEST_RESUME:
1142 break; 1142 break;
1143 case HIBERNATION_PLATFORM: 1143 case HIBERNATION_PLATFORM:
1144 if (hibernation_ops) 1144 if (hibernation_ops)
1145 break; 1145 break;
1146 /* not a valid mode, 1146 /* not a valid mode, continue with loop */
1147 continue; 1147 continue;
1148 } 1148 }
1149 if (i == hibernation_mode) 1149 if (i == hibernation_mode)
1150 count += sysfs_emit_a !! 1150 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1151 else 1151 else
1152 count += sysfs_emit_a !! 1152 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1153 } 1153 }
1154 !! 1154 buf += sprintf(buf, "\n");
1155 /* Convert the last space to a newlin !! 1155 return buf-start;
1156 if (count > 0) <<
1157 buf[count - 1] = '\n'; <<
1158 <<
1159 return count; <<
1160 } 1156 }
1161 1157
1162 static ssize_t disk_store(struct kobject *kob 1158 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1163 const char *buf, si 1159 const char *buf, size_t n)
1164 { 1160 {
1165 int mode = HIBERNATION_INVALID; 1161 int mode = HIBERNATION_INVALID;
1166 unsigned int sleep_flags; 1162 unsigned int sleep_flags;
1167 int error = 0; 1163 int error = 0;
1168 int len; 1164 int len;
1169 char *p; 1165 char *p;
1170 int i; 1166 int i;
1171 1167
1172 if (!hibernation_available()) 1168 if (!hibernation_available())
1173 return -EPERM; 1169 return -EPERM;
1174 1170
1175 p = memchr(buf, '\n', n); 1171 p = memchr(buf, '\n', n);
1176 len = p ? p - buf : n; 1172 len = p ? p - buf : n;
1177 1173
1178 sleep_flags = lock_system_sleep(); 1174 sleep_flags = lock_system_sleep();
1179 for (i = HIBERNATION_FIRST; i <= HIBE 1175 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1180 if (len == strlen(hibernation 1176 if (len == strlen(hibernation_modes[i])
1181 && !strncmp(buf, hibernat 1177 && !strncmp(buf, hibernation_modes[i], len)) {
1182 mode = i; 1178 mode = i;
1183 break; 1179 break;
1184 } 1180 }
1185 } 1181 }
1186 if (mode != HIBERNATION_INVALID) { 1182 if (mode != HIBERNATION_INVALID) {
1187 switch (mode) { 1183 switch (mode) {
1188 case HIBERNATION_SHUTDOWN: 1184 case HIBERNATION_SHUTDOWN:
1189 case HIBERNATION_REBOOT: 1185 case HIBERNATION_REBOOT:
1190 #ifdef CONFIG_SUSPEND 1186 #ifdef CONFIG_SUSPEND
1191 case HIBERNATION_SUSPEND: 1187 case HIBERNATION_SUSPEND:
1192 #endif 1188 #endif
1193 case HIBERNATION_TEST_RESUME: 1189 case HIBERNATION_TEST_RESUME:
1194 hibernation_mode = mo 1190 hibernation_mode = mode;
1195 break; 1191 break;
1196 case HIBERNATION_PLATFORM: 1192 case HIBERNATION_PLATFORM:
1197 if (hibernation_ops) 1193 if (hibernation_ops)
1198 hibernation_m 1194 hibernation_mode = mode;
1199 else 1195 else
1200 error = -EINV 1196 error = -EINVAL;
1201 } 1197 }
1202 } else 1198 } else
1203 error = -EINVAL; 1199 error = -EINVAL;
1204 1200
1205 if (!error) 1201 if (!error)
1206 pm_pr_dbg("Hibernation mode s 1202 pm_pr_dbg("Hibernation mode set to '%s'\n",
1207 hibernation_mo 1203 hibernation_modes[mode]);
1208 unlock_system_sleep(sleep_flags); 1204 unlock_system_sleep(sleep_flags);
1209 return error ? error : n; 1205 return error ? error : n;
1210 } 1206 }
1211 1207
1212 power_attr(disk); 1208 power_attr(disk);
1213 1209
1214 static ssize_t resume_show(struct kobject *ko 1210 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1215 char *buf) 1211 char *buf)
1216 { 1212 {
1217 return sysfs_emit(buf, "%d:%d\n", MAJ !! 1213 return sprintf(buf, "%d:%d\n", MAJOR(swsusp_resume_device),
1218 MINOR(swsusp_resume !! 1214 MINOR(swsusp_resume_device));
1219 } 1215 }
1220 1216
1221 static ssize_t resume_store(struct kobject *k 1217 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1222 const char *buf, 1218 const char *buf, size_t n)
1223 { 1219 {
1224 unsigned int sleep_flags; 1220 unsigned int sleep_flags;
1225 int len = n; 1221 int len = n;
1226 char *name; 1222 char *name;
1227 dev_t dev; 1223 dev_t dev;
1228 int error; 1224 int error;
1229 1225
1230 if (!hibernation_available()) 1226 if (!hibernation_available())
1231 return n; 1227 return n;
1232 1228
1233 if (len && buf[len-1] == '\n') 1229 if (len && buf[len-1] == '\n')
1234 len--; 1230 len--;
1235 name = kstrndup(buf, len, GFP_KERNEL) 1231 name = kstrndup(buf, len, GFP_KERNEL);
1236 if (!name) 1232 if (!name)
1237 return -ENOMEM; 1233 return -ENOMEM;
1238 1234
1239 error = lookup_bdev(name, &dev); 1235 error = lookup_bdev(name, &dev);
1240 if (error) { 1236 if (error) {
1241 unsigned maj, min, offset; 1237 unsigned maj, min, offset;
1242 char *p, dummy; 1238 char *p, dummy;
1243 1239
1244 error = 0; 1240 error = 0;
1245 if (sscanf(name, "%u:%u%c", & 1241 if (sscanf(name, "%u:%u%c", &maj, &min, &dummy) == 2 ||
1246 sscanf(name, "%u:%u:%u:%c 1242 sscanf(name, "%u:%u:%u:%c", &maj, &min, &offset,
1247 &dummy) == 3) 1243 &dummy) == 3) {
1248 dev = MKDEV(maj, min) 1244 dev = MKDEV(maj, min);
1249 if (maj != MAJOR(dev) 1245 if (maj != MAJOR(dev) || min != MINOR(dev))
1250 error = -EINV 1246 error = -EINVAL;
1251 } else { 1247 } else {
1252 dev = new_decode_dev( 1248 dev = new_decode_dev(simple_strtoul(name, &p, 16));
1253 if (*p) 1249 if (*p)
1254 error = -EINV 1250 error = -EINVAL;
1255 } 1251 }
1256 } 1252 }
1257 kfree(name); 1253 kfree(name);
1258 if (error) 1254 if (error)
1259 return error; 1255 return error;
1260 1256
1261 sleep_flags = lock_system_sleep(); 1257 sleep_flags = lock_system_sleep();
1262 swsusp_resume_device = dev; 1258 swsusp_resume_device = dev;
1263 unlock_system_sleep(sleep_flags); 1259 unlock_system_sleep(sleep_flags);
1264 1260
1265 pm_pr_dbg("Configured hibernation res 1261 pm_pr_dbg("Configured hibernation resume from disk to %u\n",
1266 swsusp_resume_device); 1262 swsusp_resume_device);
1267 noresume = 0; 1263 noresume = 0;
1268 software_resume(); 1264 software_resume();
1269 return n; 1265 return n;
1270 } 1266 }
1271 1267
1272 power_attr(resume); 1268 power_attr(resume);
1273 1269
1274 static ssize_t resume_offset_show(struct kobj 1270 static ssize_t resume_offset_show(struct kobject *kobj,
1275 struct kobj 1271 struct kobj_attribute *attr, char *buf)
1276 { 1272 {
1277 return sysfs_emit(buf, "%llu\n", (uns !! 1273 return sprintf(buf, "%llu\n", (unsigned long long)swsusp_resume_block);
1278 } 1274 }
1279 1275
1280 static ssize_t resume_offset_store(struct kob 1276 static ssize_t resume_offset_store(struct kobject *kobj,
1281 struct kob 1277 struct kobj_attribute *attr, const char *buf,
1282 size_t n) 1278 size_t n)
1283 { 1279 {
1284 unsigned long long offset; 1280 unsigned long long offset;
1285 int rc; 1281 int rc;
1286 1282
1287 rc = kstrtoull(buf, 0, &offset); 1283 rc = kstrtoull(buf, 0, &offset);
1288 if (rc) 1284 if (rc)
1289 return rc; 1285 return rc;
1290 swsusp_resume_block = offset; 1286 swsusp_resume_block = offset;
1291 1287
1292 return n; 1288 return n;
1293 } 1289 }
1294 1290
1295 power_attr(resume_offset); 1291 power_attr(resume_offset);
1296 1292
1297 static ssize_t image_size_show(struct kobject 1293 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1298 char *buf) 1294 char *buf)
1299 { 1295 {
1300 return sysfs_emit(buf, "%lu\n", image !! 1296 return sprintf(buf, "%lu\n", image_size);
1301 } 1297 }
1302 1298
1303 static ssize_t image_size_store(struct kobjec 1299 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1304 const char *b 1300 const char *buf, size_t n)
1305 { 1301 {
1306 unsigned long size; 1302 unsigned long size;
1307 1303
1308 if (sscanf(buf, "%lu", &size) == 1) { 1304 if (sscanf(buf, "%lu", &size) == 1) {
1309 image_size = size; 1305 image_size = size;
1310 return n; 1306 return n;
1311 } 1307 }
1312 1308
1313 return -EINVAL; 1309 return -EINVAL;
1314 } 1310 }
1315 1311
1316 power_attr(image_size); 1312 power_attr(image_size);
1317 1313
1318 static ssize_t reserved_size_show(struct kobj 1314 static ssize_t reserved_size_show(struct kobject *kobj,
1319 struct kobj 1315 struct kobj_attribute *attr, char *buf)
1320 { 1316 {
1321 return sysfs_emit(buf, "%lu\n", reser !! 1317 return sprintf(buf, "%lu\n", reserved_size);
1322 } 1318 }
1323 1319
1324 static ssize_t reserved_size_store(struct kob 1320 static ssize_t reserved_size_store(struct kobject *kobj,
1325 struct kob 1321 struct kobj_attribute *attr,
1326 const char 1322 const char *buf, size_t n)
1327 { 1323 {
1328 unsigned long size; 1324 unsigned long size;
1329 1325
1330 if (sscanf(buf, "%lu", &size) == 1) { 1326 if (sscanf(buf, "%lu", &size) == 1) {
1331 reserved_size = size; 1327 reserved_size = size;
1332 return n; 1328 return n;
1333 } 1329 }
1334 1330
1335 return -EINVAL; 1331 return -EINVAL;
1336 } 1332 }
1337 1333
1338 power_attr(reserved_size); 1334 power_attr(reserved_size);
1339 1335
1340 static struct attribute *g[] = { 1336 static struct attribute *g[] = {
1341 &disk_attr.attr, 1337 &disk_attr.attr,
1342 &resume_offset_attr.attr, 1338 &resume_offset_attr.attr,
1343 &resume_attr.attr, 1339 &resume_attr.attr,
1344 &image_size_attr.attr, 1340 &image_size_attr.attr,
1345 &reserved_size_attr.attr, 1341 &reserved_size_attr.attr,
1346 NULL, 1342 NULL,
1347 }; 1343 };
1348 1344
1349 1345
1350 static const struct attribute_group attr_grou 1346 static const struct attribute_group attr_group = {
1351 .attrs = g, 1347 .attrs = g,
1352 }; 1348 };
1353 1349
1354 1350
1355 static int __init pm_disk_init(void) 1351 static int __init pm_disk_init(void)
1356 { 1352 {
1357 return sysfs_create_group(power_kobj, 1353 return sysfs_create_group(power_kobj, &attr_group);
1358 } 1354 }
1359 1355
1360 core_initcall(pm_disk_init); 1356 core_initcall(pm_disk_init);
1361 1357
1362 1358
1363 static int __init resume_setup(char *str) 1359 static int __init resume_setup(char *str)
1364 { 1360 {
1365 if (noresume) 1361 if (noresume)
1366 return 1; 1362 return 1;
1367 1363
1368 strscpy(resume_file, str); !! 1364 strncpy(resume_file, str, 255);
1369 return 1; 1365 return 1;
1370 } 1366 }
1371 1367
1372 static int __init resume_offset_setup(char *s 1368 static int __init resume_offset_setup(char *str)
1373 { 1369 {
1374 unsigned long long offset; 1370 unsigned long long offset;
1375 1371
1376 if (noresume) 1372 if (noresume)
1377 return 1; 1373 return 1;
1378 1374
1379 if (sscanf(str, "%llu", &offset) == 1 1375 if (sscanf(str, "%llu", &offset) == 1)
1380 swsusp_resume_block = offset; 1376 swsusp_resume_block = offset;
1381 1377
1382 return 1; 1378 return 1;
1383 } 1379 }
1384 1380
1385 static int __init hibernate_setup(char *str) 1381 static int __init hibernate_setup(char *str)
1386 { 1382 {
1387 if (!strncmp(str, "noresume", 8)) { 1383 if (!strncmp(str, "noresume", 8)) {
1388 noresume = 1; 1384 noresume = 1;
1389 } else if (!strncmp(str, "nocompress" 1385 } else if (!strncmp(str, "nocompress", 10)) {
1390 nocompress = 1; 1386 nocompress = 1;
1391 } else if (!strncmp(str, "no", 2)) { 1387 } else if (!strncmp(str, "no", 2)) {
1392 noresume = 1; 1388 noresume = 1;
1393 nohibernate = 1; 1389 nohibernate = 1;
1394 } else if (IS_ENABLED(CONFIG_STRICT_K 1390 } else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)
1395 && !strncmp(str, "protect_ 1391 && !strncmp(str, "protect_image", 13)) {
1396 enable_restore_image_protecti 1392 enable_restore_image_protection();
1397 } 1393 }
1398 return 1; 1394 return 1;
1399 } 1395 }
1400 1396
1401 static int __init noresume_setup(char *str) 1397 static int __init noresume_setup(char *str)
1402 { 1398 {
1403 noresume = 1; 1399 noresume = 1;
1404 return 1; 1400 return 1;
1405 } 1401 }
1406 1402
1407 static int __init resumewait_setup(char *str) 1403 static int __init resumewait_setup(char *str)
1408 { 1404 {
1409 resume_wait = 1; 1405 resume_wait = 1;
1410 return 1; 1406 return 1;
1411 } 1407 }
1412 1408
1413 static int __init resumedelay_setup(char *str 1409 static int __init resumedelay_setup(char *str)
1414 { 1410 {
1415 int rc = kstrtouint(str, 0, &resume_d 1411 int rc = kstrtouint(str, 0, &resume_delay);
1416 1412
1417 if (rc) 1413 if (rc)
1418 pr_warn("resumedelay: bad opt 1414 pr_warn("resumedelay: bad option string '%s'\n", str);
1419 return 1; 1415 return 1;
1420 } 1416 }
1421 1417
1422 static int __init nohibernate_setup(char *str 1418 static int __init nohibernate_setup(char *str)
1423 { 1419 {
1424 noresume = 1; 1420 noresume = 1;
1425 nohibernate = 1; 1421 nohibernate = 1;
1426 return 1; 1422 return 1;
1427 } 1423 }
1428 1424
1429 static const char * const comp_alg_enabled[] 1425 static const char * const comp_alg_enabled[] = {
1430 #if IS_ENABLED(CONFIG_CRYPTO_LZO) 1426 #if IS_ENABLED(CONFIG_CRYPTO_LZO)
1431 COMPRESSION_ALGO_LZO, 1427 COMPRESSION_ALGO_LZO,
1432 #endif 1428 #endif
1433 #if IS_ENABLED(CONFIG_CRYPTO_LZ4) 1429 #if IS_ENABLED(CONFIG_CRYPTO_LZ4)
1434 COMPRESSION_ALGO_LZ4, 1430 COMPRESSION_ALGO_LZ4,
1435 #endif 1431 #endif
1436 }; 1432 };
1437 1433
1438 static int hibernate_compressor_param_set(con 1434 static int hibernate_compressor_param_set(const char *compressor,
1439 const struct kernel_param *kp 1435 const struct kernel_param *kp)
1440 { 1436 {
1441 unsigned int sleep_flags; 1437 unsigned int sleep_flags;
1442 int index, ret; 1438 int index, ret;
1443 1439
1444 sleep_flags = lock_system_sleep(); 1440 sleep_flags = lock_system_sleep();
1445 1441
1446 index = sysfs_match_string(comp_alg_e 1442 index = sysfs_match_string(comp_alg_enabled, compressor);
1447 if (index >= 0) { 1443 if (index >= 0) {
1448 ret = param_set_copystring(co 1444 ret = param_set_copystring(comp_alg_enabled[index], kp);
1449 if (!ret) 1445 if (!ret)
1450 strscpy(hib_comp_algo 1446 strscpy(hib_comp_algo, comp_alg_enabled[index],
1451 sizeof(hib_co 1447 sizeof(hib_comp_algo));
1452 } else { 1448 } else {
1453 ret = index; 1449 ret = index;
1454 } 1450 }
1455 1451
1456 unlock_system_sleep(sleep_flags); 1452 unlock_system_sleep(sleep_flags);
1457 1453
1458 if (ret) 1454 if (ret)
1459 pr_debug("Cannot set specifie 1455 pr_debug("Cannot set specified compressor %s\n",
1460 compressor); 1456 compressor);
1461 1457
1462 return ret; 1458 return ret;
1463 } 1459 }
1464 1460
1465 static const struct kernel_param_ops hibernat 1461 static const struct kernel_param_ops hibernate_compressor_param_ops = {
1466 .set = hibernate_compressor_param_ 1462 .set = hibernate_compressor_param_set,
1467 .get = param_get_string, 1463 .get = param_get_string,
1468 }; 1464 };
1469 1465
1470 static struct kparam_string hibernate_compres 1466 static struct kparam_string hibernate_compressor_param_string = {
1471 .maxlen = sizeof(hibernate_compressor 1467 .maxlen = sizeof(hibernate_compressor),
1472 .string = hibernate_compressor, 1468 .string = hibernate_compressor,
1473 }; 1469 };
1474 1470
1475 module_param_cb(compressor, &hibernate_compre 1471 module_param_cb(compressor, &hibernate_compressor_param_ops,
1476 &hibernate_compressor_param_s 1472 &hibernate_compressor_param_string, 0644);
1477 MODULE_PARM_DESC(compressor, 1473 MODULE_PARM_DESC(compressor,
1478 "Compression algorithm to be 1474 "Compression algorithm to be used with hibernation");
1479 1475
1480 __setup("noresume", noresume_setup); 1476 __setup("noresume", noresume_setup);
1481 __setup("resume_offset=", resume_offset_setup 1477 __setup("resume_offset=", resume_offset_setup);
1482 __setup("resume=", resume_setup); 1478 __setup("resume=", resume_setup);
1483 __setup("hibernate=", hibernate_setup); 1479 __setup("hibernate=", hibernate_setup);
1484 __setup("resumewait", resumewait_setup); 1480 __setup("resumewait", resumewait_setup);
1485 __setup("resumedelay=", resumedelay_setup); 1481 __setup("resumedelay=", resumedelay_setup);
1486 __setup("nohibernate", nohibernate_setup); 1482 __setup("nohibernate", nohibernate_setup);
1487 1483
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