1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * kernel/power/hibernate.c - Hibernation (a.k 2 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
4 * 3 *
5 * Copyright (c) 2003 Patrick Mochel 4 * Copyright (c) 2003 Patrick Mochel
6 * Copyright (c) 2003 Open Source Development 5 * Copyright (c) 2003 Open Source Development Lab
7 * Copyright (c) 2004 Pavel Machek <pavel@ucw. 6 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
8 * Copyright (c) 2009 Rafael J. Wysocki, Novel 7 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
9 * Copyright (C) 2012 Bojan Smojver <bojan@rex 8 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
>> 9 *
>> 10 * This file is released under the GPLv2.
10 */ 11 */
11 12
12 #define pr_fmt(fmt) "PM: hibernation: " fmt <<
13 <<
14 #include <linux/blkdev.h> <<
15 #include <linux/export.h> 13 #include <linux/export.h>
16 #include <linux/suspend.h> 14 #include <linux/suspend.h>
>> 15 #include <linux/syscalls.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> <<
26 #include <linux/console.h> 24 #include <linux/console.h>
27 #include <linux/cpu.h> 25 #include <linux/cpu.h>
28 #include <linux/freezer.h> 26 #include <linux/freezer.h>
29 #include <linux/gfp.h> 27 #include <linux/gfp.h>
30 #include <linux/syscore_ops.h> 28 #include <linux/syscore_ops.h>
31 #include <linux/ctype.h> 29 #include <linux/ctype.h>
>> 30 #include <linux/genhd.h>
32 #include <linux/ktime.h> 31 #include <linux/ktime.h>
33 #include <linux/security.h> <<
34 #include <linux/secretmem.h> <<
35 #include <trace/events/power.h> 32 #include <trace/events/power.h>
36 33
37 #include "power.h" 34 #include "power.h"
38 35
39 36
40 static int nocompress; 37 static int nocompress;
41 static int noresume; 38 static int noresume;
42 static int nohibernate; 39 static int nohibernate;
43 static int resume_wait; 40 static int resume_wait;
44 static unsigned int resume_delay; 41 static unsigned int resume_delay;
45 static char resume_file[256] = CONFIG_PM_STD_P 42 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
46 dev_t swsusp_resume_device; 43 dev_t swsusp_resume_device;
47 sector_t swsusp_resume_block; 44 sector_t swsusp_resume_block;
48 __visible int in_suspend __nosavedata; 45 __visible int in_suspend __nosavedata;
49 46
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 { 47 enum {
60 HIBERNATION_INVALID, 48 HIBERNATION_INVALID,
61 HIBERNATION_PLATFORM, 49 HIBERNATION_PLATFORM,
62 HIBERNATION_SHUTDOWN, 50 HIBERNATION_SHUTDOWN,
63 HIBERNATION_REBOOT, 51 HIBERNATION_REBOOT,
64 #ifdef CONFIG_SUSPEND 52 #ifdef CONFIG_SUSPEND
65 HIBERNATION_SUSPEND, 53 HIBERNATION_SUSPEND,
66 #endif 54 #endif
67 HIBERNATION_TEST_RESUME, <<
68 /* keep last */ 55 /* keep last */
69 __HIBERNATION_AFTER_LAST 56 __HIBERNATION_AFTER_LAST
70 }; 57 };
71 #define HIBERNATION_MAX (__HIBERNATION_AFTER_L 58 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
72 #define HIBERNATION_FIRST (HIBERNATION_INVALID 59 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
73 60
74 static int hibernation_mode = HIBERNATION_SHUT 61 static int hibernation_mode = HIBERNATION_SHUTDOWN;
75 62
76 bool freezer_test_done; 63 bool freezer_test_done;
77 64
78 static const struct platform_hibernation_ops * 65 static const struct platform_hibernation_ops *hibernation_ops;
79 66
80 static atomic_t hibernate_atomic = ATOMIC_INIT <<
81 <<
82 bool hibernate_acquire(void) <<
83 { <<
84 return atomic_add_unless(&hibernate_at <<
85 } <<
86 <<
87 void hibernate_release(void) <<
88 { <<
89 atomic_inc(&hibernate_atomic); <<
90 } <<
91 <<
92 bool hibernation_available(void) 67 bool hibernation_available(void)
93 { 68 {
94 return nohibernate == 0 && !! 69 return (nohibernate == 0);
95 !security_locked_down(LOCKDOWN <<
96 !secretmem_active() && !cxl_me <<
97 } 70 }
98 71
99 /** 72 /**
100 * hibernation_set_ops - Set the global hibern 73 * hibernation_set_ops - Set the global hibernate operations.
101 * @ops: Hibernation operations to use in subs 74 * @ops: Hibernation operations to use in subsequent hibernation transitions.
102 */ 75 */
103 void hibernation_set_ops(const struct platform 76 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
104 { 77 {
105 unsigned int sleep_flags; <<
106 <<
107 if (ops && !(ops->begin && ops->end && 78 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
108 && ops->prepare && ops->finish && 79 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
109 && ops->restore_cleanup && ops->le 80 && ops->restore_cleanup && ops->leave)) {
110 WARN_ON(1); 81 WARN_ON(1);
111 return; 82 return;
112 } 83 }
113 !! 84 lock_system_sleep();
114 sleep_flags = lock_system_sleep(); <<
115 <<
116 hibernation_ops = ops; 85 hibernation_ops = ops;
117 if (ops) 86 if (ops)
118 hibernation_mode = HIBERNATION 87 hibernation_mode = HIBERNATION_PLATFORM;
119 else if (hibernation_mode == HIBERNATI 88 else if (hibernation_mode == HIBERNATION_PLATFORM)
120 hibernation_mode = HIBERNATION 89 hibernation_mode = HIBERNATION_SHUTDOWN;
121 90
122 unlock_system_sleep(sleep_flags); !! 91 unlock_system_sleep();
123 } 92 }
124 EXPORT_SYMBOL_GPL(hibernation_set_ops); 93 EXPORT_SYMBOL_GPL(hibernation_set_ops);
125 94
126 static bool entering_platform_hibernation; 95 static bool entering_platform_hibernation;
127 96
128 bool system_entering_hibernation(void) 97 bool system_entering_hibernation(void)
129 { 98 {
130 return entering_platform_hibernation; 99 return entering_platform_hibernation;
131 } 100 }
132 EXPORT_SYMBOL(system_entering_hibernation); 101 EXPORT_SYMBOL(system_entering_hibernation);
133 102
134 #ifdef CONFIG_PM_DEBUG 103 #ifdef CONFIG_PM_DEBUG
135 static void hibernation_debug_sleep(void) 104 static void hibernation_debug_sleep(void)
136 { 105 {
137 pr_info("debug: Waiting for 5 seconds. !! 106 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
138 mdelay(5000); 107 mdelay(5000);
139 } 108 }
140 109
141 static int hibernation_test(int level) 110 static int hibernation_test(int level)
142 { 111 {
143 if (pm_test_level == level) { 112 if (pm_test_level == level) {
144 hibernation_debug_sleep(); 113 hibernation_debug_sleep();
145 return 1; 114 return 1;
146 } 115 }
147 return 0; 116 return 0;
148 } 117 }
149 #else /* !CONFIG_PM_DEBUG */ 118 #else /* !CONFIG_PM_DEBUG */
150 static int hibernation_test(int level) { retur 119 static int hibernation_test(int level) { return 0; }
151 #endif /* !CONFIG_PM_DEBUG */ 120 #endif /* !CONFIG_PM_DEBUG */
152 121
153 /** 122 /**
154 * platform_begin - Call platform to start hib 123 * platform_begin - Call platform to start hibernation.
155 * @platform_mode: Whether or not to use the p 124 * @platform_mode: Whether or not to use the platform driver.
156 */ 125 */
157 static int platform_begin(int platform_mode) 126 static int platform_begin(int platform_mode)
158 { 127 {
159 return (platform_mode && hibernation_o 128 return (platform_mode && hibernation_ops) ?
160 hibernation_ops->begin(PMSG_FR !! 129 hibernation_ops->begin() : 0;
161 } 130 }
162 131
163 /** 132 /**
164 * platform_end - Call platform to finish tran 133 * platform_end - Call platform to finish transition to the working state.
165 * @platform_mode: Whether or not to use the p 134 * @platform_mode: Whether or not to use the platform driver.
166 */ 135 */
167 static void platform_end(int platform_mode) 136 static void platform_end(int platform_mode)
168 { 137 {
169 if (platform_mode && hibernation_ops) 138 if (platform_mode && hibernation_ops)
170 hibernation_ops->end(); 139 hibernation_ops->end();
171 } 140 }
172 141
173 /** 142 /**
174 * platform_pre_snapshot - Call platform to pr 143 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
175 * @platform_mode: Whether or not to use the p 144 * @platform_mode: Whether or not to use the platform driver.
176 * 145 *
177 * Use the platform driver to prepare the syst 146 * Use the platform driver to prepare the system for creating a hibernate image,
178 * if so configured, and return an error code 147 * if so configured, and return an error code if that fails.
179 */ 148 */
180 149
181 static int platform_pre_snapshot(int platform_ 150 static int platform_pre_snapshot(int platform_mode)
182 { 151 {
183 return (platform_mode && hibernation_o 152 return (platform_mode && hibernation_ops) ?
184 hibernation_ops->pre_snapshot( 153 hibernation_ops->pre_snapshot() : 0;
185 } 154 }
186 155
187 /** 156 /**
188 * platform_leave - Call platform to prepare a 157 * platform_leave - Call platform to prepare a transition to the working state.
189 * @platform_mode: Whether or not to use the p 158 * @platform_mode: Whether or not to use the platform driver.
190 * 159 *
191 * Use the platform driver prepare to prepare 160 * Use the platform driver prepare to prepare the machine for switching to the
192 * normal mode of operation. 161 * normal mode of operation.
193 * 162 *
194 * This routine is called on one CPU with inte 163 * This routine is called on one CPU with interrupts disabled.
195 */ 164 */
196 static void platform_leave(int platform_mode) 165 static void platform_leave(int platform_mode)
197 { 166 {
198 if (platform_mode && hibernation_ops) 167 if (platform_mode && hibernation_ops)
199 hibernation_ops->leave(); 168 hibernation_ops->leave();
200 } 169 }
201 170
202 /** 171 /**
203 * platform_finish - Call platform to switch t 172 * platform_finish - Call platform to switch the system to the working state.
204 * @platform_mode: Whether or not to use the p 173 * @platform_mode: Whether or not to use the platform driver.
205 * 174 *
206 * Use the platform driver to switch the machi 175 * Use the platform driver to switch the machine to the normal mode of
207 * operation. 176 * operation.
208 * 177 *
209 * This routine must be called after platform_ 178 * This routine must be called after platform_prepare().
210 */ 179 */
211 static void platform_finish(int platform_mode) 180 static void platform_finish(int platform_mode)
212 { 181 {
213 if (platform_mode && hibernation_ops) 182 if (platform_mode && hibernation_ops)
214 hibernation_ops->finish(); 183 hibernation_ops->finish();
215 } 184 }
216 185
217 /** 186 /**
218 * platform_pre_restore - Prepare for hibernat 187 * platform_pre_restore - Prepare for hibernate image restoration.
219 * @platform_mode: Whether or not to use the p 188 * @platform_mode: Whether or not to use the platform driver.
220 * 189 *
221 * Use the platform driver to prepare the syst 190 * Use the platform driver to prepare the system for resume from a hibernation
222 * image. 191 * image.
223 * 192 *
224 * If the restore fails after this function ha 193 * If the restore fails after this function has been called,
225 * platform_restore_cleanup() must be called. 194 * platform_restore_cleanup() must be called.
226 */ 195 */
227 static int platform_pre_restore(int platform_m 196 static int platform_pre_restore(int platform_mode)
228 { 197 {
229 return (platform_mode && hibernation_o 198 return (platform_mode && hibernation_ops) ?
230 hibernation_ops->pre_restore() 199 hibernation_ops->pre_restore() : 0;
231 } 200 }
232 201
233 /** 202 /**
234 * platform_restore_cleanup - Switch to the wo 203 * platform_restore_cleanup - Switch to the working state after failing restore.
235 * @platform_mode: Whether or not to use the p 204 * @platform_mode: Whether or not to use the platform driver.
236 * 205 *
237 * Use the platform driver to switch the syste 206 * Use the platform driver to switch the system to the normal mode of operation
238 * after a failing restore. 207 * after a failing restore.
239 * 208 *
240 * If platform_pre_restore() has been called b 209 * If platform_pre_restore() has been called before the failing restore, this
241 * function must be called too, regardless of 210 * function must be called too, regardless of the result of
242 * platform_pre_restore(). 211 * platform_pre_restore().
243 */ 212 */
244 static void platform_restore_cleanup(int platf 213 static void platform_restore_cleanup(int platform_mode)
245 { 214 {
246 if (platform_mode && hibernation_ops) 215 if (platform_mode && hibernation_ops)
247 hibernation_ops->restore_clean 216 hibernation_ops->restore_cleanup();
248 } 217 }
249 218
250 /** 219 /**
251 * platform_recover - Recover from a failure t 220 * platform_recover - Recover from a failure to suspend devices.
252 * @platform_mode: Whether or not to use the p 221 * @platform_mode: Whether or not to use the platform driver.
253 */ 222 */
254 static void platform_recover(int platform_mode 223 static void platform_recover(int platform_mode)
255 { 224 {
256 if (platform_mode && hibernation_ops & 225 if (platform_mode && hibernation_ops && hibernation_ops->recover)
257 hibernation_ops->recover(); 226 hibernation_ops->recover();
258 } 227 }
259 228
260 /** 229 /**
261 * swsusp_show_speed - Print time elapsed betw 230 * swsusp_show_speed - Print time elapsed between two events during hibernation.
262 * @start: Starting event. 231 * @start: Starting event.
263 * @stop: Final event. 232 * @stop: Final event.
264 * @nr_pages: Number of memory pages processed 233 * @nr_pages: Number of memory pages processed between @start and @stop.
265 * @msg: Additional diagnostic message to prin 234 * @msg: Additional diagnostic message to print.
266 */ 235 */
267 void swsusp_show_speed(ktime_t start, ktime_t 236 void swsusp_show_speed(ktime_t start, ktime_t stop,
268 unsigned nr_pages, char 237 unsigned nr_pages, char *msg)
269 { 238 {
270 ktime_t diff; 239 ktime_t diff;
271 u64 elapsed_centisecs64; 240 u64 elapsed_centisecs64;
272 unsigned int centisecs; 241 unsigned int centisecs;
273 unsigned int k; 242 unsigned int k;
274 unsigned int kps; 243 unsigned int kps;
275 244
276 diff = ktime_sub(stop, start); 245 diff = ktime_sub(stop, start);
277 elapsed_centisecs64 = ktime_divns(diff 246 elapsed_centisecs64 = ktime_divns(diff, 10*NSEC_PER_MSEC);
278 centisecs = elapsed_centisecs64; 247 centisecs = elapsed_centisecs64;
279 if (centisecs == 0) 248 if (centisecs == 0)
280 centisecs = 1; /* avoid div-b 249 centisecs = 1; /* avoid div-by-zero */
281 k = nr_pages * (PAGE_SIZE / 1024); 250 k = nr_pages * (PAGE_SIZE / 1024);
282 kps = (k * 100) / centisecs; 251 kps = (k * 100) / centisecs;
283 pr_info("%s %u kbytes in %u.%02u secon !! 252 printk(KERN_INFO "PM: %s %u kbytes in %u.%02u seconds (%u.%02u MB/s)\n",
284 msg, k, centisecs / 100, centi !! 253 msg, k,
285 (kps % 1000) / 10); !! 254 centisecs / 100, centisecs % 100,
286 } !! 255 kps / 1000, (kps % 1000) / 10);
287 <<
288 __weak int arch_resume_nosmt(void) <<
289 { <<
290 return 0; <<
291 } 256 }
292 257
293 /** 258 /**
294 * create_image - Create a hibernation image. 259 * create_image - Create a hibernation image.
295 * @platform_mode: Whether or not to use the p 260 * @platform_mode: Whether or not to use the platform driver.
296 * 261 *
297 * Execute device drivers' "late" and "noirq" 262 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
298 * hibernation image and run the drivers' "noi 263 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
299 * 264 *
300 * Control reappears in this routine after the 265 * Control reappears in this routine after the subsequent restore.
301 */ 266 */
302 static int create_image(int platform_mode) 267 static int create_image(int platform_mode)
303 { 268 {
304 int error; 269 int error;
305 270
306 error = dpm_suspend_end(PMSG_FREEZE); 271 error = dpm_suspend_end(PMSG_FREEZE);
307 if (error) { 272 if (error) {
308 pr_err("Some devices failed to !! 273 printk(KERN_ERR "PM: Some devices failed to power down, "
>> 274 "aborting hibernation\n");
309 return error; 275 return error;
310 } 276 }
311 277
312 error = platform_pre_snapshot(platform 278 error = platform_pre_snapshot(platform_mode);
313 if (error || hibernation_test(TEST_PLA 279 if (error || hibernation_test(TEST_PLATFORM))
314 goto Platform_finish; 280 goto Platform_finish;
315 281
316 error = pm_sleep_disable_secondary_cpu !! 282 error = disable_nonboot_cpus();
317 if (error || hibernation_test(TEST_CPU 283 if (error || hibernation_test(TEST_CPUS))
318 goto Enable_cpus; 284 goto Enable_cpus;
319 285
320 local_irq_disable(); 286 local_irq_disable();
321 287
322 system_state = SYSTEM_SUSPEND; <<
323 <<
324 error = syscore_suspend(); 288 error = syscore_suspend();
325 if (error) { 289 if (error) {
326 pr_err("Some system devices fa !! 290 printk(KERN_ERR "PM: Some system devices failed to power down, "
>> 291 "aborting hibernation\n");
327 goto Enable_irqs; 292 goto Enable_irqs;
328 } 293 }
329 294
330 if (hibernation_test(TEST_CORE) || pm_ 295 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
331 goto Power_up; 296 goto Power_up;
332 297
333 in_suspend = 1; 298 in_suspend = 1;
334 save_processor_state(); 299 save_processor_state();
335 trace_suspend_resume(TPS("machine_susp 300 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, true);
336 error = swsusp_arch_suspend(); 301 error = swsusp_arch_suspend();
337 /* Restore control flow magically appe 302 /* Restore control flow magically appears here */
338 restore_processor_state(); 303 restore_processor_state();
339 trace_suspend_resume(TPS("machine_susp 304 trace_suspend_resume(TPS("machine_suspend"), PM_EVENT_HIBERNATE, false);
340 if (error) 305 if (error)
341 pr_err("Error %d creating imag !! 306 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
342 !! 307 error);
343 if (!in_suspend) { !! 308 if (!in_suspend)
344 events_check_enabled = false; 309 events_check_enabled = false;
345 clear_or_poison_free_pages(); <<
346 } <<
347 310
348 platform_leave(platform_mode); 311 platform_leave(platform_mode);
349 312
350 Power_up: 313 Power_up:
351 syscore_resume(); 314 syscore_resume();
352 315
353 Enable_irqs: 316 Enable_irqs:
354 system_state = SYSTEM_RUNNING; <<
355 local_irq_enable(); 317 local_irq_enable();
356 318
357 Enable_cpus: 319 Enable_cpus:
358 pm_sleep_enable_secondary_cpus(); !! 320 enable_nonboot_cpus();
359 <<
360 /* Allow architectures to do nosmt-spe <<
361 if (!in_suspend) <<
362 error = arch_resume_nosmt(); <<
363 321
364 Platform_finish: 322 Platform_finish:
365 platform_finish(platform_mode); 323 platform_finish(platform_mode);
366 324
367 dpm_resume_start(in_suspend ? 325 dpm_resume_start(in_suspend ?
368 (error ? PMSG_RECOVER : PMSG_T 326 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
369 327
370 return error; 328 return error;
371 } 329 }
372 330
373 /** 331 /**
374 * hibernation_snapshot - Quiesce devices and 332 * hibernation_snapshot - Quiesce devices and create a hibernation image.
375 * @platform_mode: If set, use platform driver 333 * @platform_mode: If set, use platform driver to prepare for the transition.
376 * 334 *
377 * This routine must be called with system_tra !! 335 * This routine must be called with pm_mutex held.
378 */ 336 */
379 int hibernation_snapshot(int platform_mode) 337 int hibernation_snapshot(int platform_mode)
380 { 338 {
381 pm_message_t msg; 339 pm_message_t msg;
382 int error; 340 int error;
383 341
384 pm_suspend_clear_flags(); 342 pm_suspend_clear_flags();
385 error = platform_begin(platform_mode); 343 error = platform_begin(platform_mode);
386 if (error) 344 if (error)
387 goto Close; 345 goto Close;
388 346
389 /* Preallocate image memory before shu 347 /* Preallocate image memory before shutting down devices. */
390 error = hibernate_preallocate_memory() 348 error = hibernate_preallocate_memory();
391 if (error) 349 if (error)
392 goto Close; 350 goto Close;
393 351
394 error = freeze_kernel_threads(); 352 error = freeze_kernel_threads();
395 if (error) 353 if (error)
396 goto Cleanup; 354 goto Cleanup;
397 355
398 if (hibernation_test(TEST_FREEZER)) { 356 if (hibernation_test(TEST_FREEZER)) {
399 357
400 /* 358 /*
401 * Indicate to the caller that 359 * Indicate to the caller that we are returning due to a
402 * successful freezer test. 360 * successful freezer test.
403 */ 361 */
404 freezer_test_done = true; 362 freezer_test_done = true;
405 goto Thaw; 363 goto Thaw;
406 } 364 }
407 365
408 error = dpm_prepare(PMSG_FREEZE); 366 error = dpm_prepare(PMSG_FREEZE);
409 if (error) { 367 if (error) {
410 dpm_complete(PMSG_RECOVER); 368 dpm_complete(PMSG_RECOVER);
411 goto Thaw; 369 goto Thaw;
412 } 370 }
413 371
414 suspend_console(); 372 suspend_console();
415 pm_restrict_gfp_mask(); 373 pm_restrict_gfp_mask();
416 374
417 error = dpm_suspend(PMSG_FREEZE); 375 error = dpm_suspend(PMSG_FREEZE);
418 376
419 if (error || hibernation_test(TEST_DEV 377 if (error || hibernation_test(TEST_DEVICES))
420 platform_recover(platform_mode 378 platform_recover(platform_mode);
421 else 379 else
422 error = create_image(platform_ 380 error = create_image(platform_mode);
423 381
424 /* 382 /*
425 * In the case that we call create_ima 383 * In the case that we call create_image() above, the control
426 * returns here (1) after the image ha 384 * returns here (1) after the image has been created or the
427 * image creation has failed and (2) a 385 * image creation has failed and (2) after a successful restore.
428 */ 386 */
429 387
430 /* We may need to release the prealloc 388 /* We may need to release the preallocated image pages here. */
431 if (error || !in_suspend) 389 if (error || !in_suspend)
432 swsusp_free(); 390 swsusp_free();
433 391
434 msg = in_suspend ? (error ? PMSG_RECOV 392 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
435 dpm_resume(msg); 393 dpm_resume(msg);
436 394
437 if (error || !in_suspend) 395 if (error || !in_suspend)
438 pm_restore_gfp_mask(); 396 pm_restore_gfp_mask();
439 397
440 resume_console(); 398 resume_console();
441 dpm_complete(msg); 399 dpm_complete(msg);
442 400
443 Close: 401 Close:
444 platform_end(platform_mode); 402 platform_end(platform_mode);
445 return error; 403 return error;
446 404
447 Thaw: 405 Thaw:
448 thaw_kernel_threads(); 406 thaw_kernel_threads();
449 Cleanup: 407 Cleanup:
450 swsusp_free(); 408 swsusp_free();
451 goto Close; 409 goto Close;
452 } 410 }
453 411
454 int __weak hibernate_resume_nonboot_cpu_disabl <<
455 { <<
456 return suspend_disable_secondary_cpus( <<
457 } <<
458 <<
459 /** 412 /**
460 * resume_target_kernel - Restore system state 413 * resume_target_kernel - Restore system state from a hibernation image.
461 * @platform_mode: Whether or not to use the p 414 * @platform_mode: Whether or not to use the platform driver.
462 * 415 *
463 * Execute device drivers' "noirq" and "late" 416 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
464 * contents of highmem that have not been rest 417 * contents of highmem that have not been restored yet from the image and run
465 * the low-level code that will restore the re 418 * the low-level code that will restore the remaining contents of memory and
466 * switch to the just restored target kernel. 419 * switch to the just restored target kernel.
467 */ 420 */
468 static int resume_target_kernel(bool platform_ 421 static int resume_target_kernel(bool platform_mode)
469 { 422 {
470 int error; 423 int error;
471 424
472 error = dpm_suspend_end(PMSG_QUIESCE); 425 error = dpm_suspend_end(PMSG_QUIESCE);
473 if (error) { 426 if (error) {
474 pr_err("Some devices failed to !! 427 printk(KERN_ERR "PM: Some devices failed to power down, "
>> 428 "aborting resume\n");
475 return error; 429 return error;
476 } 430 }
477 431
478 error = platform_pre_restore(platform_ 432 error = platform_pre_restore(platform_mode);
479 if (error) 433 if (error)
480 goto Cleanup; 434 goto Cleanup;
481 435
482 cpuidle_pause(); !! 436 error = disable_nonboot_cpus();
483 <<
484 error = hibernate_resume_nonboot_cpu_d <<
485 if (error) 437 if (error)
486 goto Enable_cpus; 438 goto Enable_cpus;
487 439
488 local_irq_disable(); 440 local_irq_disable();
489 system_state = SYSTEM_SUSPEND; <<
490 441
491 error = syscore_suspend(); 442 error = syscore_suspend();
492 if (error) 443 if (error)
493 goto Enable_irqs; 444 goto Enable_irqs;
494 445
495 save_processor_state(); 446 save_processor_state();
496 error = restore_highmem(); 447 error = restore_highmem();
497 if (!error) { 448 if (!error) {
498 error = swsusp_arch_resume(); 449 error = swsusp_arch_resume();
499 /* 450 /*
500 * The code below is only ever 451 * The code below is only ever reached in case of a failure.
501 * Otherwise, execution contin 452 * Otherwise, execution continues at the place where
502 * swsusp_arch_suspend() was c 453 * swsusp_arch_suspend() was called.
503 */ 454 */
504 BUG_ON(!error); 455 BUG_ON(!error);
505 /* 456 /*
506 * This call to restore_highme 457 * This call to restore_highmem() reverts the changes made by
507 * the previous one. 458 * the previous one.
508 */ 459 */
509 restore_highmem(); 460 restore_highmem();
510 } 461 }
511 /* 462 /*
512 * The only reason why swsusp_arch_res 463 * The only reason why swsusp_arch_resume() can fail is memory being
513 * very tight, so we have to free it a 464 * very tight, so we have to free it as soon as we can to avoid
514 * subsequent failures. 465 * subsequent failures.
515 */ 466 */
516 swsusp_free(); 467 swsusp_free();
517 restore_processor_state(); 468 restore_processor_state();
518 touch_softlockup_watchdog(); 469 touch_softlockup_watchdog();
519 470
520 syscore_resume(); 471 syscore_resume();
521 472
522 Enable_irqs: 473 Enable_irqs:
523 system_state = SYSTEM_RUNNING; <<
524 local_irq_enable(); 474 local_irq_enable();
525 475
526 Enable_cpus: 476 Enable_cpus:
527 pm_sleep_enable_secondary_cpus(); !! 477 enable_nonboot_cpus();
528 478
529 Cleanup: 479 Cleanup:
530 platform_restore_cleanup(platform_mode 480 platform_restore_cleanup(platform_mode);
531 481
532 dpm_resume_start(PMSG_RECOVER); 482 dpm_resume_start(PMSG_RECOVER);
533 483
534 return error; 484 return error;
535 } 485 }
536 486
537 /** 487 /**
538 * hibernation_restore - Quiesce devices and r 488 * hibernation_restore - Quiesce devices and restore from a hibernation image.
539 * @platform_mode: If set, use platform driver 489 * @platform_mode: If set, use platform driver to prepare for the transition.
540 * 490 *
541 * This routine must be called with system_tra !! 491 * This routine must be called with pm_mutex held. If it is successful, control
542 * successful, control reappears in the restor !! 492 * reappears in the restored target kernel in hibernation_snapshot().
543 * hibernation_snapshot(). <<
544 */ 493 */
545 int hibernation_restore(int platform_mode) 494 int hibernation_restore(int platform_mode)
546 { 495 {
547 int error; 496 int error;
548 497
549 pm_prepare_console(); 498 pm_prepare_console();
550 suspend_console(); 499 suspend_console();
551 pm_restrict_gfp_mask(); 500 pm_restrict_gfp_mask();
552 error = dpm_suspend_start(PMSG_QUIESCE 501 error = dpm_suspend_start(PMSG_QUIESCE);
553 if (!error) { 502 if (!error) {
554 error = resume_target_kernel(p 503 error = resume_target_kernel(platform_mode);
555 /* 504 /*
556 * The above should either suc 505 * The above should either succeed and jump to the new kernel,
557 * or return with an error. Ot 506 * or return with an error. Otherwise things are just
558 * undefined, so let's be para 507 * undefined, so let's be paranoid.
559 */ 508 */
560 BUG_ON(!error); 509 BUG_ON(!error);
561 } 510 }
562 dpm_resume_end(PMSG_RECOVER); 511 dpm_resume_end(PMSG_RECOVER);
563 pm_restore_gfp_mask(); 512 pm_restore_gfp_mask();
564 resume_console(); 513 resume_console();
565 pm_restore_console(); 514 pm_restore_console();
566 return error; 515 return error;
567 } 516 }
568 517
569 /** 518 /**
570 * hibernation_platform_enter - Power off the 519 * hibernation_platform_enter - Power off the system using the platform driver.
571 */ 520 */
572 int hibernation_platform_enter(void) 521 int hibernation_platform_enter(void)
573 { 522 {
574 int error; 523 int error;
575 524
576 if (!hibernation_ops) 525 if (!hibernation_ops)
577 return -ENOSYS; 526 return -ENOSYS;
578 527
579 /* 528 /*
580 * We have cancelled the power transit 529 * We have cancelled the power transition by running
581 * hibernation_ops->finish() before sa 530 * hibernation_ops->finish() before saving the image, so we should let
582 * the firmware know that we're going 531 * the firmware know that we're going to enter the sleep state after all
583 */ 532 */
584 error = hibernation_ops->begin(PMSG_HI !! 533 error = hibernation_ops->begin();
585 if (error) 534 if (error)
586 goto Close; 535 goto Close;
587 536
588 entering_platform_hibernation = true; 537 entering_platform_hibernation = true;
589 suspend_console(); 538 suspend_console();
590 error = dpm_suspend_start(PMSG_HIBERNA 539 error = dpm_suspend_start(PMSG_HIBERNATE);
591 if (error) { 540 if (error) {
592 if (hibernation_ops->recover) 541 if (hibernation_ops->recover)
593 hibernation_ops->recov 542 hibernation_ops->recover();
594 goto Resume_devices; 543 goto Resume_devices;
595 } 544 }
596 545
597 error = dpm_suspend_end(PMSG_HIBERNATE 546 error = dpm_suspend_end(PMSG_HIBERNATE);
598 if (error) 547 if (error)
599 goto Resume_devices; 548 goto Resume_devices;
600 549
601 error = hibernation_ops->prepare(); 550 error = hibernation_ops->prepare();
602 if (error) 551 if (error)
603 goto Platform_finish; 552 goto Platform_finish;
604 553
605 error = pm_sleep_disable_secondary_cpu !! 554 error = disable_nonboot_cpus();
606 if (error) 555 if (error)
607 goto Enable_cpus; 556 goto Enable_cpus;
608 557
609 local_irq_disable(); 558 local_irq_disable();
610 system_state = SYSTEM_SUSPEND; <<
611 syscore_suspend(); 559 syscore_suspend();
612 if (pm_wakeup_pending()) { 560 if (pm_wakeup_pending()) {
613 error = -EAGAIN; 561 error = -EAGAIN;
614 goto Power_up; 562 goto Power_up;
615 } 563 }
616 564
617 hibernation_ops->enter(); 565 hibernation_ops->enter();
618 /* We should never get here */ 566 /* We should never get here */
619 while (1); 567 while (1);
620 568
621 Power_up: 569 Power_up:
622 syscore_resume(); 570 syscore_resume();
623 system_state = SYSTEM_RUNNING; <<
624 local_irq_enable(); 571 local_irq_enable();
625 572
626 Enable_cpus: 573 Enable_cpus:
627 pm_sleep_enable_secondary_cpus(); !! 574 enable_nonboot_cpus();
628 575
629 Platform_finish: 576 Platform_finish:
630 hibernation_ops->finish(); 577 hibernation_ops->finish();
631 578
632 dpm_resume_start(PMSG_RESTORE); 579 dpm_resume_start(PMSG_RESTORE);
633 580
634 Resume_devices: 581 Resume_devices:
635 entering_platform_hibernation = false; 582 entering_platform_hibernation = false;
636 dpm_resume_end(PMSG_RESTORE); 583 dpm_resume_end(PMSG_RESTORE);
637 resume_console(); 584 resume_console();
638 585
639 Close: 586 Close:
640 hibernation_ops->end(); 587 hibernation_ops->end();
641 588
642 return error; 589 return error;
643 } 590 }
644 591
645 /** 592 /**
646 * power_down - Shut the machine down for hibe 593 * power_down - Shut the machine down for hibernation.
647 * 594 *
648 * Use the platform driver, if configured, to 595 * Use the platform driver, if configured, to put the system into the sleep
649 * state corresponding to hibernation, or try 596 * state corresponding to hibernation, or try to power it off or reboot,
650 * depending on the value of hibernation_mode. 597 * depending on the value of hibernation_mode.
651 */ 598 */
652 static void power_down(void) 599 static void power_down(void)
653 { 600 {
654 int error; <<
655 <<
656 #ifdef CONFIG_SUSPEND 601 #ifdef CONFIG_SUSPEND
657 if (hibernation_mode == HIBERNATION_SU !! 602 int error;
658 error = suspend_devices_and_en <<
659 if (error) { <<
660 hibernation_mode = hib <<
661 <<
662 <<
663 } else { <<
664 /* Restore swap signat <<
665 error = swsusp_unmark( <<
666 if (error) <<
667 pr_err("Swap w <<
668 <<
669 return; <<
670 } <<
671 } <<
672 #endif 603 #endif
673 604
674 switch (hibernation_mode) { 605 switch (hibernation_mode) {
675 case HIBERNATION_REBOOT: 606 case HIBERNATION_REBOOT:
676 kernel_restart(NULL); 607 kernel_restart(NULL);
677 break; 608 break;
678 case HIBERNATION_PLATFORM: 609 case HIBERNATION_PLATFORM:
679 error = hibernation_platform_e !! 610 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; <<
687 case HIBERNATION_SHUTDOWN: 611 case HIBERNATION_SHUTDOWN:
688 if (kernel_can_power_off()) !! 612 if (pm_power_off)
689 kernel_power_off(); 613 kernel_power_off();
690 break; 614 break;
>> 615 #ifdef CONFIG_SUSPEND
>> 616 case HIBERNATION_SUSPEND:
>> 617 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
>> 618 if (error) {
>> 619 if (hibernation_ops)
>> 620 hibernation_mode = HIBERNATION_PLATFORM;
>> 621 else
>> 622 hibernation_mode = HIBERNATION_SHUTDOWN;
>> 623 power_down();
>> 624 }
>> 625 /*
>> 626 * Restore swap signature.
>> 627 */
>> 628 error = swsusp_unmark();
>> 629 if (error)
>> 630 printk(KERN_ERR "PM: Swap will be unusable! "
>> 631 "Try swapon -a.\n");
>> 632 return;
>> 633 #endif
691 } 634 }
692 kernel_halt(); 635 kernel_halt();
693 /* 636 /*
694 * Valid image is on the disk, if we c 637 * Valid image is on the disk, if we continue we risk serious data
695 * corruption after resume. 638 * corruption after resume.
696 */ 639 */
697 pr_crit("Power down manually\n"); !! 640 printk(KERN_CRIT "PM: Please power down manually\n");
698 while (1) 641 while (1)
699 cpu_relax(); 642 cpu_relax();
700 } 643 }
701 644
702 static int load_image_and_restore(void) <<
703 { <<
704 int error; <<
705 unsigned int flags; <<
706 <<
707 pm_pr_dbg("Loading hibernation image.\ <<
708 <<
709 lock_device_hotplug(); <<
710 error = create_basic_memory_bitmaps(); <<
711 if (error) { <<
712 swsusp_close(); <<
713 goto Unlock; <<
714 } <<
715 <<
716 error = swsusp_read(&flags); <<
717 swsusp_close(); <<
718 if (!error) <<
719 error = hibernation_restore(fl <<
720 <<
721 pr_err("Failed to load image, recoveri <<
722 swsusp_free(); <<
723 free_basic_memory_bitmaps(); <<
724 Unlock: <<
725 unlock_device_hotplug(); <<
726 <<
727 return error; <<
728 } <<
729 <<
730 #define COMPRESSION_ALGO_LZO "lzo" <<
731 #define COMPRESSION_ALGO_LZ4 "lz4" <<
732 <<
733 /** 645 /**
734 * hibernate - Carry out system hibernation, i 646 * hibernate - Carry out system hibernation, including saving the image.
735 */ 647 */
736 int hibernate(void) 648 int hibernate(void)
737 { 649 {
738 bool snapshot_test = false; <<
739 unsigned int sleep_flags; <<
740 int error; 650 int error;
741 651
742 if (!hibernation_available()) { 652 if (!hibernation_available()) {
743 pm_pr_dbg("Hibernation not ava !! 653 pr_debug("PM: Hibernation not available.\n");
744 return -EPERM; 654 return -EPERM;
745 } 655 }
746 656
747 /* !! 657 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 658 /* The snapshot device should not be opened while we're running */
760 if (!hibernate_acquire()) { !! 659 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
761 error = -EBUSY; 660 error = -EBUSY;
762 goto Unlock; 661 goto Unlock;
763 } 662 }
764 663
765 pr_info("hibernation entry\n"); <<
766 pm_prepare_console(); 664 pm_prepare_console();
767 error = pm_notifier_call_chain_robust( !! 665 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
768 if (error) 666 if (error)
769 goto Restore; !! 667 goto Exit;
770 668
771 ksys_sync_helper(); !! 669 printk(KERN_INFO "PM: Syncing filesystems ... ");
>> 670 sys_sync();
>> 671 printk("done.\n");
772 672
773 error = freeze_processes(); 673 error = freeze_processes();
774 if (error) 674 if (error)
775 goto Exit; 675 goto Exit;
776 676
777 lock_device_hotplug(); 677 lock_device_hotplug();
778 /* Allocate memory management structur 678 /* Allocate memory management structures */
779 error = create_basic_memory_bitmaps(); 679 error = create_basic_memory_bitmaps();
780 if (error) 680 if (error)
781 goto Thaw; 681 goto Thaw;
782 682
783 error = hibernation_snapshot(hibernati 683 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
784 if (error || freezer_test_done) 684 if (error || freezer_test_done)
785 goto Free_bitmaps; 685 goto Free_bitmaps;
786 686
787 if (in_suspend) { 687 if (in_suspend) {
788 unsigned int flags = 0; 688 unsigned int flags = 0;
789 689
790 if (hibernation_mode == HIBERN 690 if (hibernation_mode == HIBERNATION_PLATFORM)
791 flags |= SF_PLATFORM_M 691 flags |= SF_PLATFORM_MODE;
792 if (nocompress) { !! 692 if (nocompress)
793 flags |= SF_NOCOMPRESS 693 flags |= SF_NOCOMPRESS_MODE;
794 } else { !! 694 else
795 flags |= SF_CRC32_MODE 695 flags |= SF_CRC32_MODE;
796 696
797 /* !! 697 pr_debug("PM: writing image.\n");
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 <<
811 error = swsusp_write(flags); 698 error = swsusp_write(flags);
812 swsusp_free(); 699 swsusp_free();
813 if (!error) { !! 700 if (!error)
814 if (hibernation_mode = !! 701 power_down();
815 snapshot_test <<
816 else <<
817 power_down(); <<
818 } <<
819 in_suspend = 0; 702 in_suspend = 0;
820 pm_restore_gfp_mask(); 703 pm_restore_gfp_mask();
821 } else { 704 } else {
822 pm_pr_dbg("Hibernation image r !! 705 pr_debug("PM: Image restored successfully.\n");
823 } 706 }
824 707
825 Free_bitmaps: 708 Free_bitmaps:
826 free_basic_memory_bitmaps(); 709 free_basic_memory_bitmaps();
827 Thaw: 710 Thaw:
828 unlock_device_hotplug(); 711 unlock_device_hotplug();
829 if (snapshot_test) { <<
830 pm_pr_dbg("Checking hibernatio <<
831 error = swsusp_check(false); <<
832 if (!error) <<
833 error = load_image_and <<
834 } <<
835 thaw_processes(); 712 thaw_processes();
836 713
837 /* Don't bother checking whether freez 714 /* Don't bother checking whether freezer_test_done is true */
838 freezer_test_done = false; 715 freezer_test_done = false;
839 Exit: 716 Exit:
840 pm_notifier_call_chain(PM_POST_HIBERNA 717 pm_notifier_call_chain(PM_POST_HIBERNATION);
841 Restore: <<
842 pm_restore_console(); 718 pm_restore_console();
843 hibernate_release(); !! 719 atomic_inc(&snapshot_device_available);
844 Unlock: 720 Unlock:
845 unlock_system_sleep(sleep_flags); !! 721 unlock_system_sleep();
846 pr_info("hibernation exit\n"); <<
847 <<
848 return error; 722 return error;
849 } 723 }
850 724
>> 725
851 /** 726 /**
852 * hibernate_quiet_exec - Execute a function w !! 727 * software_resume - Resume from a saved hibernation image.
853 * @func: Function to execute. <<
854 * @data: Data pointer to pass to @func. <<
855 * 728 *
856 * Return the @func return value or an error c !! 729 * This routine is called as a late initcall, when all devices have been
>> 730 * discovered and initialized already.
>> 731 *
>> 732 * The image reading code is called to see if there is a hibernation image
>> 733 * available for reading. If that is the case, devices are quiesced and the
>> 734 * contents of memory is restored from the saved image.
>> 735 *
>> 736 * If this is successful, control reappears in the restored target kernel in
>> 737 * hibernation_snapshot() which returns to hibernate(). Otherwise, the routine
>> 738 * attempts to recover gracefully and make the kernel return to the normal mode
>> 739 * of operation.
857 */ 740 */
858 int hibernate_quiet_exec(int (*func)(void *dat !! 741 static int software_resume(void)
859 { 742 {
860 unsigned int sleep_flags; <<
861 int error; 743 int error;
>> 744 unsigned int flags;
862 745
863 sleep_flags = lock_system_sleep(); !! 746 /*
864 !! 747 * If the user said "noresume".. bail out early.
865 if (!hibernate_acquire()) { !! 748 */
866 error = -EBUSY; !! 749 if (noresume || !hibernation_available())
867 goto unlock; !! 750 return 0;
868 } <<
869 <<
870 pm_prepare_console(); <<
871 <<
872 error = pm_notifier_call_chain_robust( <<
873 if (error) <<
874 goto restore; <<
875 <<
876 error = freeze_processes(); <<
877 if (error) <<
878 goto exit; <<
879 <<
880 lock_device_hotplug(); <<
881 <<
882 pm_suspend_clear_flags(); <<
883 <<
884 error = platform_begin(true); <<
885 if (error) <<
886 goto thaw; <<
887 <<
888 error = freeze_kernel_threads(); <<
889 if (error) <<
890 goto thaw; <<
891 <<
892 error = dpm_prepare(PMSG_FREEZE); <<
893 if (error) <<
894 goto dpm_complete; <<
895 <<
896 suspend_console(); <<
897 <<
898 error = dpm_suspend(PMSG_FREEZE); <<
899 if (error) <<
900 goto dpm_resume; <<
901 <<
902 error = dpm_suspend_end(PMSG_FREEZE); <<
903 if (error) <<
904 goto dpm_resume; <<
905 <<
906 error = platform_pre_snapshot(true); <<
907 if (error) <<
908 goto skip; <<
909 <<
910 error = func(data); <<
911 <<
912 skip: <<
913 platform_finish(true); <<
914 <<
915 dpm_resume_start(PMSG_THAW); <<
916 <<
917 dpm_resume: <<
918 dpm_resume(PMSG_THAW); <<
919 <<
920 resume_console(); <<
921 <<
922 dpm_complete: <<
923 dpm_complete(PMSG_THAW); <<
924 <<
925 thaw_kernel_threads(); <<
926 <<
927 thaw: <<
928 platform_end(true); <<
929 <<
930 unlock_device_hotplug(); <<
931 <<
932 thaw_processes(); <<
933 <<
934 exit: <<
935 pm_notifier_call_chain(PM_POST_HIBERNA <<
936 <<
937 restore: <<
938 pm_restore_console(); <<
939 <<
940 hibernate_release(); <<
941 751
942 unlock: !! 752 /*
943 unlock_system_sleep(sleep_flags); !! 753 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
>> 754 * is configured into the kernel. Since the regular hibernate
>> 755 * trigger path is via sysfs which takes a buffer mutex before
>> 756 * calling hibernate functions (which take pm_mutex) this can
>> 757 * cause lockdep to complain about a possible ABBA deadlock
>> 758 * which cannot happen since we're in the boot code here and
>> 759 * sysfs can't be invoked yet. Therefore, we use a subclass
>> 760 * here to avoid lockdep complaining.
>> 761 */
>> 762 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
944 763
945 return error; !! 764 if (swsusp_resume_device)
946 } !! 765 goto Check_image;
947 EXPORT_SYMBOL_GPL(hibernate_quiet_exec); <<
948 766
949 static int __init find_resume_device(void) !! 767 if (!strlen(resume_file)) {
950 { !! 768 error = -ENOENT;
951 if (!strlen(resume_file)) !! 769 goto Unlock;
952 return -ENOENT; !! 770 }
953 771
954 pm_pr_dbg("Checking hibernation image !! 772 pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
955 773
956 if (resume_delay) { 774 if (resume_delay) {
957 pr_info("Waiting %dsec before !! 775 printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
958 resume_delay); 776 resume_delay);
959 ssleep(resume_delay); 777 ssleep(resume_delay);
960 } 778 }
961 779
962 /* Check if the device is there */ 780 /* Check if the device is there */
963 if (!early_lookup_bdev(resume_file, &s !! 781 swsusp_resume_device = name_to_dev_t(resume_file);
964 return 0; !! 782 if (!swsusp_resume_device) {
965 !! 783 /*
966 /* !! 784 * Some device discovery might still be in progress; we need
967 * Some device discovery might still b !! 785 * to wait for this to finish.
968 * this to finish. !! 786 */
969 */ !! 787 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 } <<
976 788
977 return early_lookup_bdev(resume_file, !! 789 if (resume_wait) {
978 } !! 790 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
>> 791 msleep(10);
>> 792 async_synchronize_full();
>> 793 }
979 794
980 static int software_resume(void) !! 795 swsusp_resume_device = name_to_dev_t(resume_file);
981 { !! 796 if (!swsusp_resume_device) {
982 int error; !! 797 error = -ENODEV;
>> 798 goto Unlock;
>> 799 }
>> 800 }
983 801
984 pm_pr_dbg("Hibernation image partition !! 802 Check_image:
>> 803 pr_debug("PM: Hibernation image partition %d:%d present\n",
985 MAJOR(swsusp_resume_device), M 804 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
986 805
987 pm_pr_dbg("Looking for hibernation ima !! 806 pr_debug("PM: Looking for hibernation image.\n");
988 !! 807 error = swsusp_check();
989 mutex_lock(&system_transition_mutex); <<
990 error = swsusp_check(true); <<
991 if (error) 808 if (error)
992 goto Unlock; 809 goto Unlock;
993 810
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 811 /* The snapshot device should not be opened while we're running */
1011 if (!hibernate_acquire()) { !! 812 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
1012 error = -EBUSY; 813 error = -EBUSY;
1013 swsusp_close(); !! 814 swsusp_close(FMODE_READ);
1014 goto Unlock; 815 goto Unlock;
1015 } 816 }
1016 817
1017 pr_info("resume from hibernation\n"); <<
1018 pm_prepare_console(); 818 pm_prepare_console();
1019 error = pm_notifier_call_chain_robust !! 819 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
1020 if (error) 820 if (error)
1021 goto Restore; !! 821 goto Close_Finish;
1022 822
1023 pm_pr_dbg("Preparing processes for hi !! 823 pr_debug("PM: Preparing processes for restore.\n");
1024 error = freeze_processes(); 824 error = freeze_processes();
1025 if (error) 825 if (error)
1026 goto Close_Finish; 826 goto Close_Finish;
1027 827
1028 error = freeze_kernel_threads(); !! 828 pr_debug("PM: Loading hibernation image.\n");
1029 if (error) { <<
1030 thaw_processes(); <<
1031 goto Close_Finish; <<
1032 } <<
1033 829
1034 error = load_image_and_restore(); !! 830 lock_device_hotplug();
>> 831 error = create_basic_memory_bitmaps();
>> 832 if (error)
>> 833 goto Thaw;
>> 834
>> 835 error = swsusp_read(&flags);
>> 836 swsusp_close(FMODE_READ);
>> 837 if (!error)
>> 838 hibernation_restore(flags & SF_PLATFORM_MODE);
>> 839
>> 840 printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
>> 841 swsusp_free();
>> 842 free_basic_memory_bitmaps();
>> 843 Thaw:
>> 844 unlock_device_hotplug();
1035 thaw_processes(); 845 thaw_processes();
1036 Finish: 846 Finish:
1037 pm_notifier_call_chain(PM_POST_RESTOR 847 pm_notifier_call_chain(PM_POST_RESTORE);
1038 Restore: <<
1039 pm_restore_console(); 848 pm_restore_console();
1040 pr_info("resume failed (%d)\n", error !! 849 atomic_inc(&snapshot_device_available);
1041 hibernate_release(); <<
1042 /* For success case, the suspend path 850 /* For success case, the suspend path will release the lock */
1043 Unlock: 851 Unlock:
1044 mutex_unlock(&system_transition_mutex !! 852 mutex_unlock(&pm_mutex);
1045 pm_pr_dbg("Hibernation image not pres !! 853 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
1046 return error; 854 return error;
1047 Close_Finish: 855 Close_Finish:
1048 swsusp_close(); !! 856 swsusp_close(FMODE_READ);
1049 goto Finish; 857 goto Finish;
1050 } 858 }
1051 859
1052 /** !! 860 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 861
1086 862
1087 static const char * const hibernation_modes[] 863 static const char * const hibernation_modes[] = {
1088 [HIBERNATION_PLATFORM] = "platform", 864 [HIBERNATION_PLATFORM] = "platform",
1089 [HIBERNATION_SHUTDOWN] = "shutdown", 865 [HIBERNATION_SHUTDOWN] = "shutdown",
1090 [HIBERNATION_REBOOT] = "reboot", 866 [HIBERNATION_REBOOT] = "reboot",
1091 #ifdef CONFIG_SUSPEND 867 #ifdef CONFIG_SUSPEND
1092 [HIBERNATION_SUSPEND] = "suspend", 868 [HIBERNATION_SUSPEND] = "suspend",
1093 #endif 869 #endif
1094 [HIBERNATION_TEST_RESUME] = "te <<
1095 }; 870 };
1096 871
1097 /* 872 /*
1098 * /sys/power/disk - Control hibernation mode 873 * /sys/power/disk - Control hibernation mode.
1099 * 874 *
1100 * Hibernation can be handled in several ways 875 * Hibernation can be handled in several ways. There are a few different ways
1101 * to put the system into the sleep state: us 876 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1102 * or other hibernation_ops), powering it off 877 * or other hibernation_ops), powering it off or rebooting it (for testing
1103 * mostly). 878 * mostly).
1104 * 879 *
1105 * The sysfs file /sys/power/disk provides an 880 * The sysfs file /sys/power/disk provides an interface for selecting the
1106 * hibernation mode to use. Reading from thi 881 * hibernation mode to use. Reading from this file causes the available modes
1107 * to be printed. There are 3 modes that can 882 * to be printed. There are 3 modes that can be supported:
1108 * 883 *
1109 * 'platform' 884 * 'platform'
1110 * 'shutdown' 885 * 'shutdown'
1111 * 'reboot' 886 * 'reboot'
1112 * 887 *
1113 * If a platform hibernation driver is in use 888 * If a platform hibernation driver is in use, 'platform' will be supported
1114 * and will be used by default. Otherwise, ' 889 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1115 * The selected option (i.e. the one correspo 890 * The selected option (i.e. the one corresponding to the current value of
1116 * hibernation_mode) is enclosed by a square 891 * hibernation_mode) is enclosed by a square bracket.
1117 * 892 *
1118 * To select a given hibernation mode it is n 893 * To select a given hibernation mode it is necessary to write the mode's
1119 * string representation (as returned by read 894 * string representation (as returned by reading from /sys/power/disk) back
1120 * into /sys/power/disk. 895 * into /sys/power/disk.
1121 */ 896 */
1122 897
1123 static ssize_t disk_show(struct kobject *kobj 898 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1124 char *buf) 899 char *buf)
1125 { 900 {
1126 ssize_t count = 0; <<
1127 int i; 901 int i;
>> 902 char *start = buf;
1128 903
1129 if (!hibernation_available()) 904 if (!hibernation_available())
1130 return sysfs_emit(buf, "[disa !! 905 return sprintf(buf, "[disabled]\n");
1131 906
1132 for (i = HIBERNATION_FIRST; i <= HIBE 907 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1133 if (!hibernation_modes[i]) 908 if (!hibernation_modes[i])
1134 continue; 909 continue;
1135 switch (i) { 910 switch (i) {
1136 case HIBERNATION_SHUTDOWN: 911 case HIBERNATION_SHUTDOWN:
1137 case HIBERNATION_REBOOT: 912 case HIBERNATION_REBOOT:
1138 #ifdef CONFIG_SUSPEND 913 #ifdef CONFIG_SUSPEND
1139 case HIBERNATION_SUSPEND: 914 case HIBERNATION_SUSPEND:
1140 #endif 915 #endif
1141 case HIBERNATION_TEST_RESUME: <<
1142 break; 916 break;
1143 case HIBERNATION_PLATFORM: 917 case HIBERNATION_PLATFORM:
1144 if (hibernation_ops) 918 if (hibernation_ops)
1145 break; 919 break;
1146 /* not a valid mode, 920 /* not a valid mode, continue with loop */
1147 continue; 921 continue;
1148 } 922 }
1149 if (i == hibernation_mode) 923 if (i == hibernation_mode)
1150 count += sysfs_emit_a !! 924 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1151 else 925 else
1152 count += sysfs_emit_a !! 926 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1153 } 927 }
1154 !! 928 buf += sprintf(buf, "\n");
1155 /* Convert the last space to a newlin !! 929 return buf-start;
1156 if (count > 0) <<
1157 buf[count - 1] = '\n'; <<
1158 <<
1159 return count; <<
1160 } 930 }
1161 931
1162 static ssize_t disk_store(struct kobject *kob 932 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1163 const char *buf, si 933 const char *buf, size_t n)
1164 { 934 {
1165 int mode = HIBERNATION_INVALID; <<
1166 unsigned int sleep_flags; <<
1167 int error = 0; 935 int error = 0;
>> 936 int i;
1168 int len; 937 int len;
1169 char *p; 938 char *p;
1170 int i; !! 939 int mode = HIBERNATION_INVALID;
1171 940
1172 if (!hibernation_available()) 941 if (!hibernation_available())
1173 return -EPERM; 942 return -EPERM;
1174 943
1175 p = memchr(buf, '\n', n); 944 p = memchr(buf, '\n', n);
1176 len = p ? p - buf : n; 945 len = p ? p - buf : n;
1177 946
1178 sleep_flags = lock_system_sleep(); !! 947 lock_system_sleep();
1179 for (i = HIBERNATION_FIRST; i <= HIBE 948 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1180 if (len == strlen(hibernation 949 if (len == strlen(hibernation_modes[i])
1181 && !strncmp(buf, hibernat 950 && !strncmp(buf, hibernation_modes[i], len)) {
1182 mode = i; 951 mode = i;
1183 break; 952 break;
1184 } 953 }
1185 } 954 }
1186 if (mode != HIBERNATION_INVALID) { 955 if (mode != HIBERNATION_INVALID) {
1187 switch (mode) { 956 switch (mode) {
1188 case HIBERNATION_SHUTDOWN: 957 case HIBERNATION_SHUTDOWN:
1189 case HIBERNATION_REBOOT: 958 case HIBERNATION_REBOOT:
1190 #ifdef CONFIG_SUSPEND 959 #ifdef CONFIG_SUSPEND
1191 case HIBERNATION_SUSPEND: 960 case HIBERNATION_SUSPEND:
1192 #endif 961 #endif
1193 case HIBERNATION_TEST_RESUME: <<
1194 hibernation_mode = mo 962 hibernation_mode = mode;
1195 break; 963 break;
1196 case HIBERNATION_PLATFORM: 964 case HIBERNATION_PLATFORM:
1197 if (hibernation_ops) 965 if (hibernation_ops)
1198 hibernation_m 966 hibernation_mode = mode;
1199 else 967 else
1200 error = -EINV 968 error = -EINVAL;
1201 } 969 }
1202 } else 970 } else
1203 error = -EINVAL; 971 error = -EINVAL;
1204 972
1205 if (!error) 973 if (!error)
1206 pm_pr_dbg("Hibernation mode s !! 974 pr_debug("PM: Hibernation mode set to '%s'\n",
1207 hibernation_mo !! 975 hibernation_modes[mode]);
1208 unlock_system_sleep(sleep_flags); !! 976 unlock_system_sleep();
1209 return error ? error : n; 977 return error ? error : n;
1210 } 978 }
1211 979
1212 power_attr(disk); 980 power_attr(disk);
1213 981
1214 static ssize_t resume_show(struct kobject *ko 982 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1215 char *buf) 983 char *buf)
1216 { 984 {
1217 return sysfs_emit(buf, "%d:%d\n", MAJ !! 985 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1218 MINOR(swsusp_resume !! 986 MINOR(swsusp_resume_device));
1219 } 987 }
1220 988
1221 static ssize_t resume_store(struct kobject *k 989 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1222 const char *buf, 990 const char *buf, size_t n)
1223 { 991 {
1224 unsigned int sleep_flags; !! 992 dev_t res;
1225 int len = n; 993 int len = n;
1226 char *name; 994 char *name;
1227 dev_t dev; <<
1228 int error; <<
1229 <<
1230 if (!hibernation_available()) <<
1231 return n; <<
1232 995
1233 if (len && buf[len-1] == '\n') 996 if (len && buf[len-1] == '\n')
1234 len--; 997 len--;
1235 name = kstrndup(buf, len, GFP_KERNEL) 998 name = kstrndup(buf, len, GFP_KERNEL);
1236 if (!name) 999 if (!name)
1237 return -ENOMEM; 1000 return -ENOMEM;
1238 1001
1239 error = lookup_bdev(name, &dev); !! 1002 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); 1003 kfree(name);
1258 if (error) !! 1004 if (!res)
1259 return error; !! 1005 return -EINVAL;
1260 1006
1261 sleep_flags = lock_system_sleep(); !! 1007 lock_system_sleep();
1262 swsusp_resume_device = dev; !! 1008 swsusp_resume_device = res;
1263 unlock_system_sleep(sleep_flags); !! 1009 unlock_system_sleep();
1264 !! 1010 printk(KERN_INFO "PM: Starting manual resume from disk\n");
1265 pm_pr_dbg("Configured hibernation res <<
1266 swsusp_resume_device); <<
1267 noresume = 0; 1011 noresume = 0;
1268 software_resume(); 1012 software_resume();
1269 return n; 1013 return n;
1270 } 1014 }
1271 1015
1272 power_attr(resume); 1016 power_attr(resume);
1273 1017
1274 static ssize_t resume_offset_show(struct kobj <<
1275 struct kobj <<
1276 { <<
1277 return sysfs_emit(buf, "%llu\n", (uns <<
1278 } <<
1279 <<
1280 static ssize_t resume_offset_store(struct kob <<
1281 struct kob <<
1282 size_t n) <<
1283 { <<
1284 unsigned long long offset; <<
1285 int rc; <<
1286 <<
1287 rc = kstrtoull(buf, 0, &offset); <<
1288 if (rc) <<
1289 return rc; <<
1290 swsusp_resume_block = offset; <<
1291 <<
1292 return n; <<
1293 } <<
1294 <<
1295 power_attr(resume_offset); <<
1296 <<
1297 static ssize_t image_size_show(struct kobject 1018 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1298 char *buf) 1019 char *buf)
1299 { 1020 {
1300 return sysfs_emit(buf, "%lu\n", image !! 1021 return sprintf(buf, "%lu\n", image_size);
1301 } 1022 }
1302 1023
1303 static ssize_t image_size_store(struct kobjec 1024 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1304 const char *b 1025 const char *buf, size_t n)
1305 { 1026 {
1306 unsigned long size; 1027 unsigned long size;
1307 1028
1308 if (sscanf(buf, "%lu", &size) == 1) { 1029 if (sscanf(buf, "%lu", &size) == 1) {
1309 image_size = size; 1030 image_size = size;
1310 return n; 1031 return n;
1311 } 1032 }
1312 1033
1313 return -EINVAL; 1034 return -EINVAL;
1314 } 1035 }
1315 1036
1316 power_attr(image_size); 1037 power_attr(image_size);
1317 1038
1318 static ssize_t reserved_size_show(struct kobj 1039 static ssize_t reserved_size_show(struct kobject *kobj,
1319 struct kobj 1040 struct kobj_attribute *attr, char *buf)
1320 { 1041 {
1321 return sysfs_emit(buf, "%lu\n", reser !! 1042 return sprintf(buf, "%lu\n", reserved_size);
1322 } 1043 }
1323 1044
1324 static ssize_t reserved_size_store(struct kob 1045 static ssize_t reserved_size_store(struct kobject *kobj,
1325 struct kob 1046 struct kobj_attribute *attr,
1326 const char 1047 const char *buf, size_t n)
1327 { 1048 {
1328 unsigned long size; 1049 unsigned long size;
1329 1050
1330 if (sscanf(buf, "%lu", &size) == 1) { 1051 if (sscanf(buf, "%lu", &size) == 1) {
1331 reserved_size = size; 1052 reserved_size = size;
1332 return n; 1053 return n;
1333 } 1054 }
1334 1055
1335 return -EINVAL; 1056 return -EINVAL;
1336 } 1057 }
1337 1058
1338 power_attr(reserved_size); 1059 power_attr(reserved_size);
1339 1060
1340 static struct attribute *g[] = { !! 1061 static struct attribute * g[] = {
1341 &disk_attr.attr, 1062 &disk_attr.attr,
1342 &resume_offset_attr.attr, <<
1343 &resume_attr.attr, 1063 &resume_attr.attr,
1344 &image_size_attr.attr, 1064 &image_size_attr.attr,
1345 &reserved_size_attr.attr, 1065 &reserved_size_attr.attr,
1346 NULL, 1066 NULL,
1347 }; 1067 };
1348 1068
1349 1069
1350 static const struct attribute_group attr_grou !! 1070 static struct attribute_group attr_group = {
1351 .attrs = g, 1071 .attrs = g,
1352 }; 1072 };
1353 1073
1354 1074
1355 static int __init pm_disk_init(void) 1075 static int __init pm_disk_init(void)
1356 { 1076 {
1357 return sysfs_create_group(power_kobj, 1077 return sysfs_create_group(power_kobj, &attr_group);
1358 } 1078 }
1359 1079
1360 core_initcall(pm_disk_init); 1080 core_initcall(pm_disk_init);
1361 1081
1362 1082
1363 static int __init resume_setup(char *str) 1083 static int __init resume_setup(char *str)
1364 { 1084 {
1365 if (noresume) 1085 if (noresume)
1366 return 1; 1086 return 1;
1367 1087
1368 strscpy(resume_file, str); !! 1088 strncpy( resume_file, str, 255 );
1369 return 1; 1089 return 1;
1370 } 1090 }
1371 1091
1372 static int __init resume_offset_setup(char *s 1092 static int __init resume_offset_setup(char *str)
1373 { 1093 {
1374 unsigned long long offset; 1094 unsigned long long offset;
1375 1095
1376 if (noresume) 1096 if (noresume)
1377 return 1; 1097 return 1;
1378 1098
1379 if (sscanf(str, "%llu", &offset) == 1 1099 if (sscanf(str, "%llu", &offset) == 1)
1380 swsusp_resume_block = offset; 1100 swsusp_resume_block = offset;
1381 1101
1382 return 1; 1102 return 1;
1383 } 1103 }
1384 1104
1385 static int __init hibernate_setup(char *str) 1105 static int __init hibernate_setup(char *str)
1386 { 1106 {
1387 if (!strncmp(str, "noresume", 8)) { !! 1107 if (!strncmp(str, "noresume", 8))
1388 noresume = 1; 1108 noresume = 1;
1389 } else if (!strncmp(str, "nocompress" !! 1109 else if (!strncmp(str, "nocompress", 10))
1390 nocompress = 1; 1110 nocompress = 1;
1391 } else if (!strncmp(str, "no", 2)) { !! 1111 else if (!strncmp(str, "no", 2)) {
1392 noresume = 1; 1112 noresume = 1;
1393 nohibernate = 1; 1113 nohibernate = 1;
1394 } else if (IS_ENABLED(CONFIG_STRICT_K <<
1395 && !strncmp(str, "protect_ <<
1396 enable_restore_image_protecti <<
1397 } 1114 }
1398 return 1; 1115 return 1;
1399 } 1116 }
1400 1117
1401 static int __init noresume_setup(char *str) 1118 static int __init noresume_setup(char *str)
1402 { 1119 {
1403 noresume = 1; 1120 noresume = 1;
1404 return 1; 1121 return 1;
1405 } 1122 }
1406 1123
1407 static int __init resumewait_setup(char *str) 1124 static int __init resumewait_setup(char *str)
1408 { 1125 {
1409 resume_wait = 1; 1126 resume_wait = 1;
1410 return 1; 1127 return 1;
1411 } 1128 }
1412 1129
1413 static int __init resumedelay_setup(char *str 1130 static int __init resumedelay_setup(char *str)
1414 { 1131 {
1415 int rc = kstrtouint(str, 0, &resume_d 1132 int rc = kstrtouint(str, 0, &resume_delay);
1416 1133
1417 if (rc) 1134 if (rc)
1418 pr_warn("resumedelay: bad opt !! 1135 return rc;
1419 return 1; 1136 return 1;
1420 } 1137 }
1421 1138
1422 static int __init nohibernate_setup(char *str 1139 static int __init nohibernate_setup(char *str)
1423 { 1140 {
1424 noresume = 1; 1141 noresume = 1;
1425 nohibernate = 1; 1142 nohibernate = 1;
1426 return 1; 1143 return 1;
1427 } 1144 }
1428 1145
1429 static const char * const comp_alg_enabled[] !! 1146 static int __init kaslr_nohibernate_setup(char *str)
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 { 1147 {
1441 unsigned int sleep_flags; !! 1148 return nohibernate_setup(str);
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 } 1149 }
1464 1150
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 <<
1480 __setup("noresume", noresume_setup); 1151 __setup("noresume", noresume_setup);
1481 __setup("resume_offset=", resume_offset_setup 1152 __setup("resume_offset=", resume_offset_setup);
1482 __setup("resume=", resume_setup); 1153 __setup("resume=", resume_setup);
1483 __setup("hibernate=", hibernate_setup); 1154 __setup("hibernate=", hibernate_setup);
1484 __setup("resumewait", resumewait_setup); 1155 __setup("resumewait", resumewait_setup);
1485 __setup("resumedelay=", resumedelay_setup); 1156 __setup("resumedelay=", resumedelay_setup);
1486 __setup("nohibernate", nohibernate_setup); 1157 __setup("nohibernate", nohibernate_setup);
>> 1158 __setup("kaslr", kaslr_nohibernate_setup);
1487 1159
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