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