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