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