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