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