1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * kernel/power/hibernate.c - Hibernation (a.k 2 * kernel/power/hibernate.c - Hibernation (a.k.a suspend-to-disk) support.
4 * 3 *
5 * Copyright (c) 2003 Patrick Mochel 4 * Copyright (c) 2003 Patrick Mochel
6 * Copyright (c) 2003 Open Source Development 5 * Copyright (c) 2003 Open Source Development Lab
7 * Copyright (c) 2004 Pavel Machek <pavel@ucw. 6 * Copyright (c) 2004 Pavel Machek <pavel@ucw.cz>
8 * Copyright (c) 2009 Rafael J. Wysocki, Novel 7 * Copyright (c) 2009 Rafael J. Wysocki, Novell Inc.
9 * Copyright (C) 2012 Bojan Smojver <bojan@rex 8 * Copyright (C) 2012 Bojan Smojver <bojan@rexursive.com>
>> 9 *
>> 10 * This file is released under the GPLv2.
10 */ 11 */
11 12
12 #define pr_fmt(fmt) "PM: hibernation: " fmt <<
13 <<
14 #include <linux/blkdev.h> <<
15 #include <linux/export.h> 13 #include <linux/export.h>
16 #include <linux/suspend.h> 14 #include <linux/suspend.h>
>> 15 #include <linux/syscalls.h>
17 #include <linux/reboot.h> 16 #include <linux/reboot.h>
18 #include <linux/string.h> 17 #include <linux/string.h>
19 #include <linux/device.h> 18 #include <linux/device.h>
20 #include <linux/async.h> 19 #include <linux/async.h>
21 #include <linux/delay.h> 20 #include <linux/delay.h>
22 #include <linux/fs.h> 21 #include <linux/fs.h>
23 #include <linux/mount.h> 22 #include <linux/mount.h>
24 #include <linux/pm.h> 23 #include <linux/pm.h>
25 #include <linux/nmi.h> <<
26 #include <linux/console.h> 24 #include <linux/console.h>
27 #include <linux/cpu.h> 25 #include <linux/cpu.h>
28 #include <linux/freezer.h> 26 #include <linux/freezer.h>
29 #include <linux/gfp.h> 27 #include <linux/gfp.h>
30 #include <linux/syscore_ops.h> 28 #include <linux/syscore_ops.h>
31 #include <linux/ctype.h> 29 #include <linux/ctype.h>
32 #include <linux/ktime.h> !! 30 #include <linux/genhd.h>
33 #include <linux/security.h> <<
34 #include <linux/secretmem.h> <<
35 #include <trace/events/power.h> <<
36 31
37 #include "power.h" 32 #include "power.h"
38 33
39 34
40 static int nocompress; 35 static int nocompress;
41 static int noresume; 36 static int noresume;
42 static int nohibernate; <<
43 static int resume_wait; 37 static int resume_wait;
44 static unsigned int resume_delay; !! 38 static int resume_delay;
45 static char resume_file[256] = CONFIG_PM_STD_P 39 static char resume_file[256] = CONFIG_PM_STD_PARTITION;
46 dev_t swsusp_resume_device; 40 dev_t swsusp_resume_device;
47 sector_t swsusp_resume_block; 41 sector_t swsusp_resume_block;
48 __visible int in_suspend __nosavedata; !! 42 int in_suspend __nosavedata;
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 43
59 enum { 44 enum {
60 HIBERNATION_INVALID, 45 HIBERNATION_INVALID,
61 HIBERNATION_PLATFORM, 46 HIBERNATION_PLATFORM,
62 HIBERNATION_SHUTDOWN, 47 HIBERNATION_SHUTDOWN,
63 HIBERNATION_REBOOT, 48 HIBERNATION_REBOOT,
64 #ifdef CONFIG_SUSPEND 49 #ifdef CONFIG_SUSPEND
65 HIBERNATION_SUSPEND, 50 HIBERNATION_SUSPEND,
66 #endif 51 #endif
67 HIBERNATION_TEST_RESUME, <<
68 /* keep last */ 52 /* keep last */
69 __HIBERNATION_AFTER_LAST 53 __HIBERNATION_AFTER_LAST
70 }; 54 };
71 #define HIBERNATION_MAX (__HIBERNATION_AFTER_L 55 #define HIBERNATION_MAX (__HIBERNATION_AFTER_LAST-1)
72 #define HIBERNATION_FIRST (HIBERNATION_INVALID 56 #define HIBERNATION_FIRST (HIBERNATION_INVALID + 1)
73 57
74 static int hibernation_mode = HIBERNATION_SHUT 58 static int hibernation_mode = HIBERNATION_SHUTDOWN;
75 59
76 bool freezer_test_done; 60 bool freezer_test_done;
77 61
78 static const struct platform_hibernation_ops * 62 static const struct platform_hibernation_ops *hibernation_ops;
79 63
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) <<
93 { <<
94 return nohibernate == 0 && <<
95 !security_locked_down(LOCKDOWN <<
96 !secretmem_active() && !cxl_me <<
97 } <<
98 <<
99 /** 64 /**
100 * hibernation_set_ops - Set the global hibern 65 * hibernation_set_ops - Set the global hibernate operations.
101 * @ops: Hibernation operations to use in subs 66 * @ops: Hibernation operations to use in subsequent hibernation transitions.
102 */ 67 */
103 void hibernation_set_ops(const struct platform 68 void hibernation_set_ops(const struct platform_hibernation_ops *ops)
104 { 69 {
105 unsigned int sleep_flags; <<
106 <<
107 if (ops && !(ops->begin && ops->end && 70 if (ops && !(ops->begin && ops->end && ops->pre_snapshot
108 && ops->prepare && ops->finish && 71 && ops->prepare && ops->finish && ops->enter && ops->pre_restore
109 && ops->restore_cleanup && ops->le 72 && ops->restore_cleanup && ops->leave)) {
110 WARN_ON(1); 73 WARN_ON(1);
111 return; 74 return;
112 } 75 }
113 !! 76 lock_system_sleep();
114 sleep_flags = lock_system_sleep(); <<
115 <<
116 hibernation_ops = ops; 77 hibernation_ops = ops;
117 if (ops) 78 if (ops)
118 hibernation_mode = HIBERNATION 79 hibernation_mode = HIBERNATION_PLATFORM;
119 else if (hibernation_mode == HIBERNATI 80 else if (hibernation_mode == HIBERNATION_PLATFORM)
120 hibernation_mode = HIBERNATION 81 hibernation_mode = HIBERNATION_SHUTDOWN;
121 82
122 unlock_system_sleep(sleep_flags); !! 83 unlock_system_sleep();
123 } 84 }
124 EXPORT_SYMBOL_GPL(hibernation_set_ops); <<
125 85
126 static bool entering_platform_hibernation; 86 static bool entering_platform_hibernation;
127 87
128 bool system_entering_hibernation(void) 88 bool system_entering_hibernation(void)
129 { 89 {
130 return entering_platform_hibernation; 90 return entering_platform_hibernation;
131 } 91 }
132 EXPORT_SYMBOL(system_entering_hibernation); 92 EXPORT_SYMBOL(system_entering_hibernation);
133 93
134 #ifdef CONFIG_PM_DEBUG 94 #ifdef CONFIG_PM_DEBUG
135 static void hibernation_debug_sleep(void) 95 static void hibernation_debug_sleep(void)
136 { 96 {
137 pr_info("debug: Waiting for 5 seconds. !! 97 printk(KERN_INFO "hibernation debug: Waiting for 5 seconds.\n");
138 mdelay(5000); 98 mdelay(5000);
139 } 99 }
140 100
141 static int hibernation_test(int level) 101 static int hibernation_test(int level)
142 { 102 {
143 if (pm_test_level == level) { 103 if (pm_test_level == level) {
144 hibernation_debug_sleep(); 104 hibernation_debug_sleep();
145 return 1; 105 return 1;
146 } 106 }
147 return 0; 107 return 0;
148 } 108 }
149 #else /* !CONFIG_PM_DEBUG */ 109 #else /* !CONFIG_PM_DEBUG */
150 static int hibernation_test(int level) { retur 110 static int hibernation_test(int level) { return 0; }
151 #endif /* !CONFIG_PM_DEBUG */ 111 #endif /* !CONFIG_PM_DEBUG */
152 112
153 /** 113 /**
154 * platform_begin - Call platform to start hib 114 * platform_begin - Call platform to start hibernation.
155 * @platform_mode: Whether or not to use the p 115 * @platform_mode: Whether or not to use the platform driver.
156 */ 116 */
157 static int platform_begin(int platform_mode) 117 static int platform_begin(int platform_mode)
158 { 118 {
159 return (platform_mode && hibernation_o 119 return (platform_mode && hibernation_ops) ?
160 hibernation_ops->begin(PMSG_FR !! 120 hibernation_ops->begin() : 0;
161 } 121 }
162 122
163 /** 123 /**
164 * platform_end - Call platform to finish tran 124 * platform_end - Call platform to finish transition to the working state.
165 * @platform_mode: Whether or not to use the p 125 * @platform_mode: Whether or not to use the platform driver.
166 */ 126 */
167 static void platform_end(int platform_mode) 127 static void platform_end(int platform_mode)
168 { 128 {
169 if (platform_mode && hibernation_ops) 129 if (platform_mode && hibernation_ops)
170 hibernation_ops->end(); 130 hibernation_ops->end();
171 } 131 }
172 132
173 /** 133 /**
174 * platform_pre_snapshot - Call platform to pr 134 * platform_pre_snapshot - Call platform to prepare the machine for hibernation.
175 * @platform_mode: Whether or not to use the p 135 * @platform_mode: Whether or not to use the platform driver.
176 * 136 *
177 * Use the platform driver to prepare the syst 137 * Use the platform driver to prepare the system for creating a hibernate image,
178 * if so configured, and return an error code 138 * if so configured, and return an error code if that fails.
179 */ 139 */
180 140
181 static int platform_pre_snapshot(int platform_ 141 static int platform_pre_snapshot(int platform_mode)
182 { 142 {
183 return (platform_mode && hibernation_o 143 return (platform_mode && hibernation_ops) ?
184 hibernation_ops->pre_snapshot( 144 hibernation_ops->pre_snapshot() : 0;
185 } 145 }
186 146
187 /** 147 /**
188 * platform_leave - Call platform to prepare a 148 * platform_leave - Call platform to prepare a transition to the working state.
189 * @platform_mode: Whether or not to use the p 149 * @platform_mode: Whether or not to use the platform driver.
190 * 150 *
191 * Use the platform driver prepare to prepare 151 * Use the platform driver prepare to prepare the machine for switching to the
192 * normal mode of operation. 152 * normal mode of operation.
193 * 153 *
194 * This routine is called on one CPU with inte 154 * This routine is called on one CPU with interrupts disabled.
195 */ 155 */
196 static void platform_leave(int platform_mode) 156 static void platform_leave(int platform_mode)
197 { 157 {
198 if (platform_mode && hibernation_ops) 158 if (platform_mode && hibernation_ops)
199 hibernation_ops->leave(); 159 hibernation_ops->leave();
200 } 160 }
201 161
202 /** 162 /**
203 * platform_finish - Call platform to switch t 163 * platform_finish - Call platform to switch the system to the working state.
204 * @platform_mode: Whether or not to use the p 164 * @platform_mode: Whether or not to use the platform driver.
205 * 165 *
206 * Use the platform driver to switch the machi 166 * Use the platform driver to switch the machine to the normal mode of
207 * operation. 167 * operation.
208 * 168 *
209 * This routine must be called after platform_ 169 * This routine must be called after platform_prepare().
210 */ 170 */
211 static void platform_finish(int platform_mode) 171 static void platform_finish(int platform_mode)
212 { 172 {
213 if (platform_mode && hibernation_ops) 173 if (platform_mode && hibernation_ops)
214 hibernation_ops->finish(); 174 hibernation_ops->finish();
215 } 175 }
216 176
217 /** 177 /**
218 * platform_pre_restore - Prepare for hibernat 178 * platform_pre_restore - Prepare for hibernate image restoration.
219 * @platform_mode: Whether or not to use the p 179 * @platform_mode: Whether or not to use the platform driver.
220 * 180 *
221 * Use the platform driver to prepare the syst 181 * Use the platform driver to prepare the system for resume from a hibernation
222 * image. 182 * image.
223 * 183 *
224 * If the restore fails after this function ha 184 * If the restore fails after this function has been called,
225 * platform_restore_cleanup() must be called. 185 * platform_restore_cleanup() must be called.
226 */ 186 */
227 static int platform_pre_restore(int platform_m 187 static int platform_pre_restore(int platform_mode)
228 { 188 {
229 return (platform_mode && hibernation_o 189 return (platform_mode && hibernation_ops) ?
230 hibernation_ops->pre_restore() 190 hibernation_ops->pre_restore() : 0;
231 } 191 }
232 192
233 /** 193 /**
234 * platform_restore_cleanup - Switch to the wo 194 * platform_restore_cleanup - Switch to the working state after failing restore.
235 * @platform_mode: Whether or not to use the p 195 * @platform_mode: Whether or not to use the platform driver.
236 * 196 *
237 * Use the platform driver to switch the syste 197 * Use the platform driver to switch the system to the normal mode of operation
238 * after a failing restore. 198 * after a failing restore.
239 * 199 *
240 * If platform_pre_restore() has been called b 200 * If platform_pre_restore() has been called before the failing restore, this
241 * function must be called too, regardless of 201 * function must be called too, regardless of the result of
242 * platform_pre_restore(). 202 * platform_pre_restore().
243 */ 203 */
244 static void platform_restore_cleanup(int platf 204 static void platform_restore_cleanup(int platform_mode)
245 { 205 {
246 if (platform_mode && hibernation_ops) 206 if (platform_mode && hibernation_ops)
247 hibernation_ops->restore_clean 207 hibernation_ops->restore_cleanup();
248 } 208 }
249 209
250 /** 210 /**
251 * platform_recover - Recover from a failure t 211 * platform_recover - Recover from a failure to suspend devices.
252 * @platform_mode: Whether or not to use the p 212 * @platform_mode: Whether or not to use the platform driver.
253 */ 213 */
254 static void platform_recover(int platform_mode 214 static void platform_recover(int platform_mode)
255 { 215 {
256 if (platform_mode && hibernation_ops & 216 if (platform_mode && hibernation_ops && hibernation_ops->recover)
257 hibernation_ops->recover(); 217 hibernation_ops->recover();
258 } 218 }
259 219
260 /** 220 /**
261 * swsusp_show_speed - Print time elapsed betw 221 * swsusp_show_speed - Print time elapsed between two events during hibernation.
262 * @start: Starting event. 222 * @start: Starting event.
263 * @stop: Final event. 223 * @stop: Final event.
264 * @nr_pages: Number of memory pages processed 224 * @nr_pages: Number of memory pages processed between @start and @stop.
265 * @msg: Additional diagnostic message to prin 225 * @msg: Additional diagnostic message to print.
266 */ 226 */
267 void swsusp_show_speed(ktime_t start, ktime_t !! 227 void swsusp_show_speed(struct timeval *start, struct timeval *stop,
268 unsigned nr_pages, char !! 228 unsigned nr_pages, char *msg)
269 { 229 {
270 ktime_t diff; !! 230 s64 elapsed_centisecs64;
271 u64 elapsed_centisecs64; !! 231 int centisecs;
272 unsigned int centisecs; !! 232 int k;
273 unsigned int k; !! 233 int kps;
274 unsigned int kps; <<
275 234
276 diff = ktime_sub(stop, start); !! 235 elapsed_centisecs64 = timeval_to_ns(stop) - timeval_to_ns(start);
277 elapsed_centisecs64 = ktime_divns(diff !! 236 do_div(elapsed_centisecs64, NSEC_PER_SEC / 100);
278 centisecs = elapsed_centisecs64; 237 centisecs = elapsed_centisecs64;
279 if (centisecs == 0) 238 if (centisecs == 0)
280 centisecs = 1; /* avoid div-b 239 centisecs = 1; /* avoid div-by-zero */
281 k = nr_pages * (PAGE_SIZE / 1024); 240 k = nr_pages * (PAGE_SIZE / 1024);
282 kps = (k * 100) / centisecs; 241 kps = (k * 100) / centisecs;
283 pr_info("%s %u kbytes in %u.%02u secon !! 242 printk(KERN_INFO "PM: %s %d kbytes in %d.%02d seconds (%d.%02d MB/s)\n",
284 msg, k, centisecs / 100, centi !! 243 msg, k,
285 (kps % 1000) / 10); !! 244 centisecs / 100, centisecs % 100,
286 } !! 245 kps / 1000, (kps % 1000) / 10);
287 <<
288 __weak int arch_resume_nosmt(void) <<
289 { <<
290 return 0; <<
291 } 246 }
292 247
293 /** 248 /**
294 * create_image - Create a hibernation image. 249 * create_image - Create a hibernation image.
295 * @platform_mode: Whether or not to use the p 250 * @platform_mode: Whether or not to use the platform driver.
296 * 251 *
297 * Execute device drivers' "late" and "noirq" 252 * Execute device drivers' "late" and "noirq" freeze callbacks, create a
298 * hibernation image and run the drivers' "noi 253 * hibernation image and run the drivers' "noirq" and "early" thaw callbacks.
299 * 254 *
300 * Control reappears in this routine after the 255 * Control reappears in this routine after the subsequent restore.
301 */ 256 */
302 static int create_image(int platform_mode) 257 static int create_image(int platform_mode)
303 { 258 {
304 int error; 259 int error;
305 260
306 error = dpm_suspend_end(PMSG_FREEZE); 261 error = dpm_suspend_end(PMSG_FREEZE);
307 if (error) { 262 if (error) {
308 pr_err("Some devices failed to !! 263 printk(KERN_ERR "PM: Some devices failed to power down, "
>> 264 "aborting hibernation\n");
309 return error; 265 return error;
310 } 266 }
311 267
312 error = platform_pre_snapshot(platform 268 error = platform_pre_snapshot(platform_mode);
313 if (error || hibernation_test(TEST_PLA 269 if (error || hibernation_test(TEST_PLATFORM))
314 goto Platform_finish; 270 goto Platform_finish;
315 271
316 error = pm_sleep_disable_secondary_cpu !! 272 error = disable_nonboot_cpus();
317 if (error || hibernation_test(TEST_CPU 273 if (error || hibernation_test(TEST_CPUS))
318 goto Enable_cpus; 274 goto Enable_cpus;
319 275
320 local_irq_disable(); 276 local_irq_disable();
321 277
322 system_state = SYSTEM_SUSPEND; <<
323 <<
324 error = syscore_suspend(); 278 error = syscore_suspend();
325 if (error) { 279 if (error) {
326 pr_err("Some system devices fa !! 280 printk(KERN_ERR "PM: Some system devices failed to power down, "
>> 281 "aborting hibernation\n");
327 goto Enable_irqs; 282 goto Enable_irqs;
328 } 283 }
329 284
330 if (hibernation_test(TEST_CORE) || pm_ 285 if (hibernation_test(TEST_CORE) || pm_wakeup_pending())
331 goto Power_up; 286 goto Power_up;
332 287
333 in_suspend = 1; 288 in_suspend = 1;
334 save_processor_state(); 289 save_processor_state();
335 trace_suspend_resume(TPS("machine_susp <<
336 error = swsusp_arch_suspend(); 290 error = swsusp_arch_suspend();
>> 291 if (error)
>> 292 printk(KERN_ERR "PM: Error %d creating hibernation image\n",
>> 293 error);
337 /* Restore control flow magically appe 294 /* Restore control flow magically appears here */
338 restore_processor_state(); 295 restore_processor_state();
339 trace_suspend_resume(TPS("machine_susp <<
340 if (error) <<
341 pr_err("Error %d creating imag <<
342 <<
343 if (!in_suspend) { 296 if (!in_suspend) {
344 events_check_enabled = false; 297 events_check_enabled = false;
345 clear_or_poison_free_pages(); !! 298 platform_leave(platform_mode);
346 } 299 }
347 300
348 platform_leave(platform_mode); <<
349 <<
350 Power_up: 301 Power_up:
351 syscore_resume(); 302 syscore_resume();
352 303
353 Enable_irqs: 304 Enable_irqs:
354 system_state = SYSTEM_RUNNING; <<
355 local_irq_enable(); 305 local_irq_enable();
356 306
357 Enable_cpus: 307 Enable_cpus:
358 pm_sleep_enable_secondary_cpus(); !! 308 enable_nonboot_cpus();
359 <<
360 /* Allow architectures to do nosmt-spe <<
361 if (!in_suspend) <<
362 error = arch_resume_nosmt(); <<
363 309
364 Platform_finish: 310 Platform_finish:
365 platform_finish(platform_mode); 311 platform_finish(platform_mode);
366 312
367 dpm_resume_start(in_suspend ? 313 dpm_resume_start(in_suspend ?
368 (error ? PMSG_RECOVER : PMSG_T 314 (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
369 315
370 return error; 316 return error;
371 } 317 }
372 318
373 /** 319 /**
374 * hibernation_snapshot - Quiesce devices and 320 * hibernation_snapshot - Quiesce devices and create a hibernation image.
375 * @platform_mode: If set, use platform driver 321 * @platform_mode: If set, use platform driver to prepare for the transition.
376 * 322 *
377 * This routine must be called with system_tra !! 323 * This routine must be called with pm_mutex held.
378 */ 324 */
379 int hibernation_snapshot(int platform_mode) 325 int hibernation_snapshot(int platform_mode)
380 { 326 {
381 pm_message_t msg; 327 pm_message_t msg;
382 int error; 328 int error;
383 329
384 pm_suspend_clear_flags(); <<
385 error = platform_begin(platform_mode); 330 error = platform_begin(platform_mode);
386 if (error) 331 if (error)
387 goto Close; 332 goto Close;
388 333
389 /* Preallocate image memory before shu 334 /* Preallocate image memory before shutting down devices. */
390 error = hibernate_preallocate_memory() 335 error = hibernate_preallocate_memory();
391 if (error) 336 if (error)
392 goto Close; 337 goto Close;
393 338
394 error = freeze_kernel_threads(); 339 error = freeze_kernel_threads();
395 if (error) 340 if (error)
396 goto Cleanup; 341 goto Cleanup;
397 342
398 if (hibernation_test(TEST_FREEZER)) { 343 if (hibernation_test(TEST_FREEZER)) {
399 344
400 /* 345 /*
401 * Indicate to the caller that 346 * Indicate to the caller that we are returning due to a
402 * successful freezer test. 347 * successful freezer test.
403 */ 348 */
404 freezer_test_done = true; 349 freezer_test_done = true;
405 goto Thaw; 350 goto Thaw;
406 } 351 }
407 352
408 error = dpm_prepare(PMSG_FREEZE); 353 error = dpm_prepare(PMSG_FREEZE);
409 if (error) { 354 if (error) {
410 dpm_complete(PMSG_RECOVER); 355 dpm_complete(PMSG_RECOVER);
411 goto Thaw; 356 goto Thaw;
412 } 357 }
413 358
414 suspend_console(); 359 suspend_console();
>> 360 ftrace_stop();
415 pm_restrict_gfp_mask(); 361 pm_restrict_gfp_mask();
416 362
417 error = dpm_suspend(PMSG_FREEZE); 363 error = dpm_suspend(PMSG_FREEZE);
418 364
419 if (error || hibernation_test(TEST_DEV 365 if (error || hibernation_test(TEST_DEVICES))
420 platform_recover(platform_mode 366 platform_recover(platform_mode);
421 else 367 else
422 error = create_image(platform_ 368 error = create_image(platform_mode);
423 369
424 /* 370 /*
425 * In the case that we call create_ima 371 * In the case that we call create_image() above, the control
426 * returns here (1) after the image ha 372 * returns here (1) after the image has been created or the
427 * image creation has failed and (2) a 373 * image creation has failed and (2) after a successful restore.
428 */ 374 */
429 375
430 /* We may need to release the prealloc 376 /* We may need to release the preallocated image pages here. */
431 if (error || !in_suspend) 377 if (error || !in_suspend)
432 swsusp_free(); 378 swsusp_free();
433 379
434 msg = in_suspend ? (error ? PMSG_RECOV 380 msg = in_suspend ? (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE;
435 dpm_resume(msg); 381 dpm_resume(msg);
436 382
437 if (error || !in_suspend) 383 if (error || !in_suspend)
438 pm_restore_gfp_mask(); 384 pm_restore_gfp_mask();
439 385
>> 386 ftrace_start();
440 resume_console(); 387 resume_console();
441 dpm_complete(msg); 388 dpm_complete(msg);
442 389
443 Close: 390 Close:
444 platform_end(platform_mode); 391 platform_end(platform_mode);
445 return error; 392 return error;
446 393
447 Thaw: 394 Thaw:
448 thaw_kernel_threads(); 395 thaw_kernel_threads();
449 Cleanup: 396 Cleanup:
450 swsusp_free(); 397 swsusp_free();
451 goto Close; 398 goto Close;
452 } 399 }
453 400
454 int __weak hibernate_resume_nonboot_cpu_disabl <<
455 { <<
456 return suspend_disable_secondary_cpus( <<
457 } <<
458 <<
459 /** 401 /**
460 * resume_target_kernel - Restore system state 402 * resume_target_kernel - Restore system state from a hibernation image.
461 * @platform_mode: Whether or not to use the p 403 * @platform_mode: Whether or not to use the platform driver.
462 * 404 *
463 * Execute device drivers' "noirq" and "late" 405 * Execute device drivers' "noirq" and "late" freeze callbacks, restore the
464 * contents of highmem that have not been rest 406 * contents of highmem that have not been restored yet from the image and run
465 * the low-level code that will restore the re 407 * the low-level code that will restore the remaining contents of memory and
466 * switch to the just restored target kernel. 408 * switch to the just restored target kernel.
467 */ 409 */
468 static int resume_target_kernel(bool platform_ 410 static int resume_target_kernel(bool platform_mode)
469 { 411 {
470 int error; 412 int error;
471 413
472 error = dpm_suspend_end(PMSG_QUIESCE); 414 error = dpm_suspend_end(PMSG_QUIESCE);
473 if (error) { 415 if (error) {
474 pr_err("Some devices failed to !! 416 printk(KERN_ERR "PM: Some devices failed to power down, "
>> 417 "aborting resume\n");
475 return error; 418 return error;
476 } 419 }
477 420
478 error = platform_pre_restore(platform_ 421 error = platform_pre_restore(platform_mode);
479 if (error) 422 if (error)
480 goto Cleanup; 423 goto Cleanup;
481 424
482 cpuidle_pause(); !! 425 error = disable_nonboot_cpus();
483 <<
484 error = hibernate_resume_nonboot_cpu_d <<
485 if (error) 426 if (error)
486 goto Enable_cpus; 427 goto Enable_cpus;
487 428
488 local_irq_disable(); 429 local_irq_disable();
489 system_state = SYSTEM_SUSPEND; <<
490 430
491 error = syscore_suspend(); 431 error = syscore_suspend();
492 if (error) 432 if (error)
493 goto Enable_irqs; 433 goto Enable_irqs;
494 434
495 save_processor_state(); 435 save_processor_state();
496 error = restore_highmem(); 436 error = restore_highmem();
497 if (!error) { 437 if (!error) {
498 error = swsusp_arch_resume(); 438 error = swsusp_arch_resume();
499 /* 439 /*
500 * The code below is only ever 440 * The code below is only ever reached in case of a failure.
501 * Otherwise, execution contin 441 * Otherwise, execution continues at the place where
502 * swsusp_arch_suspend() was c 442 * swsusp_arch_suspend() was called.
503 */ 443 */
504 BUG_ON(!error); 444 BUG_ON(!error);
505 /* 445 /*
506 * This call to restore_highme 446 * This call to restore_highmem() reverts the changes made by
507 * the previous one. 447 * the previous one.
508 */ 448 */
509 restore_highmem(); 449 restore_highmem();
510 } 450 }
511 /* 451 /*
512 * The only reason why swsusp_arch_res 452 * The only reason why swsusp_arch_resume() can fail is memory being
513 * very tight, so we have to free it a 453 * very tight, so we have to free it as soon as we can to avoid
514 * subsequent failures. 454 * subsequent failures.
515 */ 455 */
516 swsusp_free(); 456 swsusp_free();
517 restore_processor_state(); 457 restore_processor_state();
518 touch_softlockup_watchdog(); 458 touch_softlockup_watchdog();
519 459
520 syscore_resume(); 460 syscore_resume();
521 461
522 Enable_irqs: 462 Enable_irqs:
523 system_state = SYSTEM_RUNNING; <<
524 local_irq_enable(); 463 local_irq_enable();
525 464
526 Enable_cpus: 465 Enable_cpus:
527 pm_sleep_enable_secondary_cpus(); !! 466 enable_nonboot_cpus();
528 467
529 Cleanup: 468 Cleanup:
530 platform_restore_cleanup(platform_mode 469 platform_restore_cleanup(platform_mode);
531 470
532 dpm_resume_start(PMSG_RECOVER); 471 dpm_resume_start(PMSG_RECOVER);
533 472
534 return error; 473 return error;
535 } 474 }
536 475
537 /** 476 /**
538 * hibernation_restore - Quiesce devices and r 477 * hibernation_restore - Quiesce devices and restore from a hibernation image.
539 * @platform_mode: If set, use platform driver 478 * @platform_mode: If set, use platform driver to prepare for the transition.
540 * 479 *
541 * This routine must be called with system_tra !! 480 * This routine must be called with pm_mutex held. If it is successful, control
542 * successful, control reappears in the restor !! 481 * reappears in the restored target kernel in hibernation_snapshot().
543 * hibernation_snapshot(). <<
544 */ 482 */
545 int hibernation_restore(int platform_mode) 483 int hibernation_restore(int platform_mode)
546 { 484 {
547 int error; 485 int error;
548 486
549 pm_prepare_console(); 487 pm_prepare_console();
550 suspend_console(); 488 suspend_console();
>> 489 ftrace_stop();
551 pm_restrict_gfp_mask(); 490 pm_restrict_gfp_mask();
552 error = dpm_suspend_start(PMSG_QUIESCE 491 error = dpm_suspend_start(PMSG_QUIESCE);
553 if (!error) { 492 if (!error) {
554 error = resume_target_kernel(p 493 error = resume_target_kernel(platform_mode);
555 /* 494 /*
556 * The above should either suc 495 * The above should either succeed and jump to the new kernel,
557 * or return with an error. Ot 496 * or return with an error. Otherwise things are just
558 * undefined, so let's be para 497 * undefined, so let's be paranoid.
559 */ 498 */
560 BUG_ON(!error); 499 BUG_ON(!error);
561 } 500 }
562 dpm_resume_end(PMSG_RECOVER); 501 dpm_resume_end(PMSG_RECOVER);
563 pm_restore_gfp_mask(); 502 pm_restore_gfp_mask();
>> 503 ftrace_start();
564 resume_console(); 504 resume_console();
565 pm_restore_console(); 505 pm_restore_console();
566 return error; 506 return error;
567 } 507 }
568 508
569 /** 509 /**
570 * hibernation_platform_enter - Power off the 510 * hibernation_platform_enter - Power off the system using the platform driver.
571 */ 511 */
572 int hibernation_platform_enter(void) 512 int hibernation_platform_enter(void)
573 { 513 {
574 int error; 514 int error;
575 515
576 if (!hibernation_ops) 516 if (!hibernation_ops)
577 return -ENOSYS; 517 return -ENOSYS;
578 518
579 /* 519 /*
580 * We have cancelled the power transit 520 * We have cancelled the power transition by running
581 * hibernation_ops->finish() before sa 521 * hibernation_ops->finish() before saving the image, so we should let
582 * the firmware know that we're going 522 * the firmware know that we're going to enter the sleep state after all
583 */ 523 */
584 error = hibernation_ops->begin(PMSG_HI !! 524 error = hibernation_ops->begin();
585 if (error) 525 if (error)
586 goto Close; 526 goto Close;
587 527
588 entering_platform_hibernation = true; 528 entering_platform_hibernation = true;
589 suspend_console(); 529 suspend_console();
>> 530 ftrace_stop();
590 error = dpm_suspend_start(PMSG_HIBERNA 531 error = dpm_suspend_start(PMSG_HIBERNATE);
591 if (error) { 532 if (error) {
592 if (hibernation_ops->recover) 533 if (hibernation_ops->recover)
593 hibernation_ops->recov 534 hibernation_ops->recover();
594 goto Resume_devices; 535 goto Resume_devices;
595 } 536 }
596 537
597 error = dpm_suspend_end(PMSG_HIBERNATE 538 error = dpm_suspend_end(PMSG_HIBERNATE);
598 if (error) 539 if (error)
599 goto Resume_devices; 540 goto Resume_devices;
600 541
601 error = hibernation_ops->prepare(); 542 error = hibernation_ops->prepare();
602 if (error) 543 if (error)
603 goto Platform_finish; 544 goto Platform_finish;
604 545
605 error = pm_sleep_disable_secondary_cpu !! 546 error = disable_nonboot_cpus();
606 if (error) 547 if (error)
607 goto Enable_cpus; !! 548 goto Platform_finish;
608 549
609 local_irq_disable(); 550 local_irq_disable();
610 system_state = SYSTEM_SUSPEND; <<
611 syscore_suspend(); 551 syscore_suspend();
612 if (pm_wakeup_pending()) { 552 if (pm_wakeup_pending()) {
613 error = -EAGAIN; 553 error = -EAGAIN;
614 goto Power_up; 554 goto Power_up;
615 } 555 }
616 556
617 hibernation_ops->enter(); 557 hibernation_ops->enter();
618 /* We should never get here */ 558 /* We should never get here */
619 while (1); 559 while (1);
620 560
621 Power_up: 561 Power_up:
622 syscore_resume(); 562 syscore_resume();
623 system_state = SYSTEM_RUNNING; <<
624 local_irq_enable(); 563 local_irq_enable();
625 !! 564 enable_nonboot_cpus();
626 Enable_cpus: <<
627 pm_sleep_enable_secondary_cpus(); <<
628 565
629 Platform_finish: 566 Platform_finish:
630 hibernation_ops->finish(); 567 hibernation_ops->finish();
631 568
632 dpm_resume_start(PMSG_RESTORE); 569 dpm_resume_start(PMSG_RESTORE);
633 570
634 Resume_devices: 571 Resume_devices:
635 entering_platform_hibernation = false; 572 entering_platform_hibernation = false;
636 dpm_resume_end(PMSG_RESTORE); 573 dpm_resume_end(PMSG_RESTORE);
>> 574 ftrace_start();
637 resume_console(); 575 resume_console();
638 576
639 Close: 577 Close:
640 hibernation_ops->end(); 578 hibernation_ops->end();
641 579
642 return error; 580 return error;
643 } 581 }
644 582
645 /** 583 /**
646 * power_down - Shut the machine down for hibe 584 * power_down - Shut the machine down for hibernation.
647 * 585 *
648 * Use the platform driver, if configured, to 586 * Use the platform driver, if configured, to put the system into the sleep
649 * state corresponding to hibernation, or try 587 * state corresponding to hibernation, or try to power it off or reboot,
650 * depending on the value of hibernation_mode. 588 * depending on the value of hibernation_mode.
651 */ 589 */
652 static void power_down(void) 590 static void power_down(void)
653 { 591 {
654 int error; <<
655 <<
656 #ifdef CONFIG_SUSPEND 592 #ifdef CONFIG_SUSPEND
657 if (hibernation_mode == HIBERNATION_SU !! 593 int error;
658 error = suspend_devices_and_en <<
659 if (error) { <<
660 hibernation_mode = hib <<
661 <<
662 <<
663 } else { <<
664 /* Restore swap signat <<
665 error = swsusp_unmark( <<
666 if (error) <<
667 pr_err("Swap w <<
668 <<
669 return; <<
670 } <<
671 } <<
672 #endif 594 #endif
673 595
674 switch (hibernation_mode) { 596 switch (hibernation_mode) {
675 case HIBERNATION_REBOOT: 597 case HIBERNATION_REBOOT:
676 kernel_restart(NULL); 598 kernel_restart(NULL);
677 break; 599 break;
678 case HIBERNATION_PLATFORM: 600 case HIBERNATION_PLATFORM:
679 error = hibernation_platform_e !! 601 hibernation_platform_enter();
680 if (error == -EAGAIN || error <<
681 swsusp_unmark(); <<
682 events_check_enabled = <<
683 pr_info("Wakeup event <<
684 return; <<
685 } <<
686 fallthrough; <<
687 case HIBERNATION_SHUTDOWN: 602 case HIBERNATION_SHUTDOWN:
688 if (kernel_can_power_off()) !! 603 kernel_power_off();
689 kernel_power_off(); <<
690 break; 604 break;
>> 605 #ifdef CONFIG_SUSPEND
>> 606 case HIBERNATION_SUSPEND:
>> 607 error = suspend_devices_and_enter(PM_SUSPEND_MEM);
>> 608 if (error) {
>> 609 if (hibernation_ops)
>> 610 hibernation_mode = HIBERNATION_PLATFORM;
>> 611 else
>> 612 hibernation_mode = HIBERNATION_SHUTDOWN;
>> 613 power_down();
>> 614 }
>> 615 /*
>> 616 * Restore swap signature.
>> 617 */
>> 618 error = swsusp_unmark();
>> 619 if (error)
>> 620 printk(KERN_ERR "PM: Swap will be unusable! "
>> 621 "Try swapon -a.\n");
>> 622 return;
>> 623 #endif
691 } 624 }
692 kernel_halt(); 625 kernel_halt();
693 /* 626 /*
694 * Valid image is on the disk, if we c 627 * Valid image is on the disk, if we continue we risk serious data
695 * corruption after resume. 628 * corruption after resume.
696 */ 629 */
697 pr_crit("Power down manually\n"); !! 630 printk(KERN_CRIT "PM: Please power down manually\n");
698 while (1) !! 631 while(1);
699 cpu_relax(); <<
700 } <<
701 <<
702 static int load_image_and_restore(void) <<
703 { <<
704 int error; <<
705 unsigned int flags; <<
706 <<
707 pm_pr_dbg("Loading hibernation image.\ <<
708 <<
709 lock_device_hotplug(); <<
710 error = create_basic_memory_bitmaps(); <<
711 if (error) { <<
712 swsusp_close(); <<
713 goto Unlock; <<
714 } <<
715 <<
716 error = swsusp_read(&flags); <<
717 swsusp_close(); <<
718 if (!error) <<
719 error = hibernation_restore(fl <<
720 <<
721 pr_err("Failed to load image, recoveri <<
722 swsusp_free(); <<
723 free_basic_memory_bitmaps(); <<
724 Unlock: <<
725 unlock_device_hotplug(); <<
726 <<
727 return error; <<
728 } 632 }
729 633
730 #define COMPRESSION_ALGO_LZO "lzo" <<
731 #define COMPRESSION_ALGO_LZ4 "lz4" <<
732 <<
733 /** 634 /**
734 * hibernate - Carry out system hibernation, i 635 * hibernate - Carry out system hibernation, including saving the image.
735 */ 636 */
736 int hibernate(void) 637 int hibernate(void)
737 { 638 {
738 bool snapshot_test = false; <<
739 unsigned int sleep_flags; <<
740 int error; 639 int error;
741 640
742 if (!hibernation_available()) { !! 641 lock_system_sleep();
743 pm_pr_dbg("Hibernation not ava <<
744 return -EPERM; <<
745 } <<
746 <<
747 /* <<
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 642 /* The snapshot device should not be opened while we're running */
760 if (!hibernate_acquire()) { !! 643 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
761 error = -EBUSY; 644 error = -EBUSY;
762 goto Unlock; 645 goto Unlock;
763 } 646 }
764 647
765 pr_info("hibernation entry\n"); <<
766 pm_prepare_console(); 648 pm_prepare_console();
767 error = pm_notifier_call_chain_robust( !! 649 error = pm_notifier_call_chain(PM_HIBERNATION_PREPARE);
768 if (error) <<
769 goto Restore; <<
770 <<
771 ksys_sync_helper(); <<
772 <<
773 error = freeze_processes(); <<
774 if (error) 650 if (error)
775 goto Exit; 651 goto Exit;
776 652
777 lock_device_hotplug(); <<
778 /* Allocate memory management structur 653 /* Allocate memory management structures */
779 error = create_basic_memory_bitmaps(); 654 error = create_basic_memory_bitmaps();
780 if (error) 655 if (error)
781 goto Thaw; !! 656 goto Exit;
>> 657
>> 658 printk(KERN_INFO "PM: Syncing filesystems ... ");
>> 659 sys_sync();
>> 660 printk("done.\n");
>> 661
>> 662 error = freeze_processes();
>> 663 if (error)
>> 664 goto Free_bitmaps;
782 665
783 error = hibernation_snapshot(hibernati 666 error = hibernation_snapshot(hibernation_mode == HIBERNATION_PLATFORM);
784 if (error || freezer_test_done) 667 if (error || freezer_test_done)
785 goto Free_bitmaps; !! 668 goto Thaw;
786 669
787 if (in_suspend) { 670 if (in_suspend) {
788 unsigned int flags = 0; 671 unsigned int flags = 0;
789 672
790 if (hibernation_mode == HIBERN 673 if (hibernation_mode == HIBERNATION_PLATFORM)
791 flags |= SF_PLATFORM_M 674 flags |= SF_PLATFORM_MODE;
792 if (nocompress) { !! 675 if (nocompress)
793 flags |= SF_NOCOMPRESS 676 flags |= SF_NOCOMPRESS_MODE;
794 } else { !! 677 else
795 flags |= SF_CRC32_MODE 678 flags |= SF_CRC32_MODE;
796 679
797 /* !! 680 pr_debug("PM: writing image.\n");
798 * By default, LZO com <<
799 * to override this be <<
800 * <<
801 * Refer kernel/power/ <<
802 */ <<
803 <<
804 if (!strcmp(hib_comp_a <<
805 flags |= SF_CO <<
806 else <<
807 flags |= SF_CO <<
808 } <<
809 <<
810 pm_pr_dbg("Writing hibernation <<
811 error = swsusp_write(flags); 681 error = swsusp_write(flags);
812 swsusp_free(); 682 swsusp_free();
813 if (!error) { !! 683 if (!error)
814 if (hibernation_mode = !! 684 power_down();
815 snapshot_test <<
816 else <<
817 power_down(); <<
818 } <<
819 in_suspend = 0; 685 in_suspend = 0;
820 pm_restore_gfp_mask(); 686 pm_restore_gfp_mask();
821 } else { 687 } else {
822 pm_pr_dbg("Hibernation image r !! 688 pr_debug("PM: Image restored successfully.\n");
823 } 689 }
824 690
825 Free_bitmaps: <<
826 free_basic_memory_bitmaps(); <<
827 Thaw: 691 Thaw:
828 unlock_device_hotplug(); <<
829 if (snapshot_test) { <<
830 pm_pr_dbg("Checking hibernatio <<
831 error = swsusp_check(false); <<
832 if (!error) <<
833 error = load_image_and <<
834 } <<
835 thaw_processes(); 692 thaw_processes();
836 693
837 /* Don't bother checking whether freez 694 /* Don't bother checking whether freezer_test_done is true */
838 freezer_test_done = false; 695 freezer_test_done = false;
>> 696
>> 697 Free_bitmaps:
>> 698 free_basic_memory_bitmaps();
839 Exit: 699 Exit:
840 pm_notifier_call_chain(PM_POST_HIBERNA 700 pm_notifier_call_chain(PM_POST_HIBERNATION);
841 Restore: <<
842 pm_restore_console(); 701 pm_restore_console();
843 hibernate_release(); !! 702 atomic_inc(&snapshot_device_available);
844 Unlock: 703 Unlock:
845 unlock_system_sleep(sleep_flags); !! 704 unlock_system_sleep();
846 pr_info("hibernation exit\n"); <<
847 <<
848 return error; 705 return error;
849 } 706 }
850 707
>> 708
851 /** 709 /**
852 * hibernate_quiet_exec - Execute a function w !! 710 * software_resume - Resume from a saved hibernation image.
853 * @func: Function to execute. !! 711 *
854 * @data: Data pointer to pass to @func. !! 712 * This routine is called as a late initcall, when all devices have been
>> 713 * discovered and initialized already.
>> 714 *
>> 715 * The image reading code is called to see if there is a hibernation image
>> 716 * available for reading. If that is the case, devices are quiesced and the
>> 717 * contents of memory is restored from the saved image.
855 * 718 *
856 * Return the @func return value or an error c !! 719 * If this is successful, control reappears in the restored target kernel in
>> 720 * hibernation_snaphot() which returns to hibernate(). Otherwise, the routine
>> 721 * attempts to recover gracefully and make the kernel return to the normal mode
>> 722 * of operation.
857 */ 723 */
858 int hibernate_quiet_exec(int (*func)(void *dat !! 724 static int software_resume(void)
859 { 725 {
860 unsigned int sleep_flags; <<
861 int error; 726 int error;
>> 727 unsigned int flags;
862 728
863 sleep_flags = lock_system_sleep(); !! 729 /*
864 !! 730 * If the user said "noresume".. bail out early.
865 if (!hibernate_acquire()) { !! 731 */
866 error = -EBUSY; !! 732 if (noresume)
867 goto unlock; !! 733 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(); <<
941 734
942 unlock: !! 735 /*
943 unlock_system_sleep(sleep_flags); !! 736 * name_to_dev_t() below takes a sysfs buffer mutex when sysfs
>> 737 * is configured into the kernel. Since the regular hibernate
>> 738 * trigger path is via sysfs which takes a buffer mutex before
>> 739 * calling hibernate functions (which take pm_mutex) this can
>> 740 * cause lockdep to complain about a possible ABBA deadlock
>> 741 * which cannot happen since we're in the boot code here and
>> 742 * sysfs can't be invoked yet. Therefore, we use a subclass
>> 743 * here to avoid lockdep complaining.
>> 744 */
>> 745 mutex_lock_nested(&pm_mutex, SINGLE_DEPTH_NESTING);
944 746
945 return error; !! 747 if (swsusp_resume_device)
946 } !! 748 goto Check_image;
947 EXPORT_SYMBOL_GPL(hibernate_quiet_exec); <<
948 749
949 static int __init find_resume_device(void) !! 750 if (!strlen(resume_file)) {
950 { !! 751 error = -ENOENT;
951 if (!strlen(resume_file)) !! 752 goto Unlock;
952 return -ENOENT; !! 753 }
953 754
954 pm_pr_dbg("Checking hibernation image !! 755 pr_debug("PM: Checking hibernation image partition %s\n", resume_file);
955 756
956 if (resume_delay) { 757 if (resume_delay) {
957 pr_info("Waiting %dsec before !! 758 printk(KERN_INFO "Waiting %dsec before reading resume device...\n",
958 resume_delay); 759 resume_delay);
959 ssleep(resume_delay); 760 ssleep(resume_delay);
960 } 761 }
961 762
962 /* Check if the device is there */ 763 /* Check if the device is there */
963 if (!early_lookup_bdev(resume_file, &s !! 764 swsusp_resume_device = name_to_dev_t(resume_file);
964 return 0; <<
965 765
966 /* 766 /*
967 * Some device discovery might still b !! 767 * name_to_dev_t is ineffective to verify parition if resume_file is in
968 * this to finish. !! 768 * integer format. (e.g. major:minor)
969 */ 769 */
970 wait_for_device_probe(); !! 770 if (isdigit(resume_file[0]) && resume_wait) {
971 if (resume_wait) { !! 771 int partno;
972 while (early_lookup_bdev(resum !! 772 while (!get_gendisk(swsusp_resume_device, &partno))
973 msleep(10); 773 msleep(10);
974 async_synchronize_full(); <<
975 } 774 }
976 775
977 return early_lookup_bdev(resume_file, !! 776 if (!swsusp_resume_device) {
978 } !! 777 /*
>> 778 * Some device discovery might still be in progress; we need
>> 779 * to wait for this to finish.
>> 780 */
>> 781 wait_for_device_probe();
979 782
980 static int software_resume(void) !! 783 if (resume_wait) {
981 { !! 784 while ((swsusp_resume_device = name_to_dev_t(resume_file)) == 0)
982 int error; !! 785 msleep(10);
>> 786 async_synchronize_full();
>> 787 }
983 788
984 pm_pr_dbg("Hibernation image partition !! 789 swsusp_resume_device = name_to_dev_t(resume_file);
985 MAJOR(swsusp_resume_device), M !! 790 if (!swsusp_resume_device) {
>> 791 error = -ENODEV;
>> 792 goto Unlock;
>> 793 }
>> 794 }
986 795
987 pm_pr_dbg("Looking for hibernation ima !! 796 Check_image:
>> 797 pr_debug("PM: Hibernation image partition %d:%d present\n",
>> 798 MAJOR(swsusp_resume_device), MINOR(swsusp_resume_device));
988 799
989 mutex_lock(&system_transition_mutex); !! 800 pr_debug("PM: Looking for hibernation image.\n");
990 error = swsusp_check(true); !! 801 error = swsusp_check();
991 if (error) 802 if (error)
992 goto Unlock; 803 goto Unlock;
993 804
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 805 /* The snapshot device should not be opened while we're running */
1011 if (!hibernate_acquire()) { !! 806 if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
1012 error = -EBUSY; 807 error = -EBUSY;
1013 swsusp_close(); !! 808 swsusp_close(FMODE_READ);
1014 goto Unlock; 809 goto Unlock;
1015 } 810 }
1016 811
1017 pr_info("resume from hibernation\n"); <<
1018 pm_prepare_console(); 812 pm_prepare_console();
1019 error = pm_notifier_call_chain_robust !! 813 error = pm_notifier_call_chain(PM_RESTORE_PREPARE);
1020 if (error) 814 if (error)
1021 goto Restore; !! 815 goto close_finish;
1022 816
1023 pm_pr_dbg("Preparing processes for hi !! 817 error = create_basic_memory_bitmaps();
1024 error = freeze_processes(); <<
1025 if (error) 818 if (error)
1026 goto Close_Finish; !! 819 goto close_finish;
1027 820
1028 error = freeze_kernel_threads(); !! 821 pr_debug("PM: Preparing processes for restore.\n");
>> 822 error = freeze_processes();
1029 if (error) { 823 if (error) {
1030 thaw_processes(); !! 824 swsusp_close(FMODE_READ);
1031 goto Close_Finish; !! 825 goto Done;
1032 } 826 }
1033 827
1034 error = load_image_and_restore(); !! 828 pr_debug("PM: Loading hibernation image.\n");
>> 829
>> 830 error = swsusp_read(&flags);
>> 831 swsusp_close(FMODE_READ);
>> 832 if (!error)
>> 833 hibernation_restore(flags & SF_PLATFORM_MODE);
>> 834
>> 835 printk(KERN_ERR "PM: Failed to load hibernation image, recovering.\n");
>> 836 swsusp_free();
1035 thaw_processes(); 837 thaw_processes();
>> 838 Done:
>> 839 free_basic_memory_bitmaps();
1036 Finish: 840 Finish:
1037 pm_notifier_call_chain(PM_POST_RESTOR 841 pm_notifier_call_chain(PM_POST_RESTORE);
1038 Restore: <<
1039 pm_restore_console(); 842 pm_restore_console();
1040 pr_info("resume failed (%d)\n", error !! 843 atomic_inc(&snapshot_device_available);
1041 hibernate_release(); <<
1042 /* For success case, the suspend path 844 /* For success case, the suspend path will release the lock */
1043 Unlock: 845 Unlock:
1044 mutex_unlock(&system_transition_mutex !! 846 mutex_unlock(&pm_mutex);
1045 pm_pr_dbg("Hibernation image not pres !! 847 pr_debug("PM: Hibernation image not present or could not be loaded.\n");
1046 return error; 848 return error;
1047 Close_Finish: !! 849 close_finish:
1048 swsusp_close(); !! 850 swsusp_close(FMODE_READ);
1049 goto Finish; 851 goto Finish;
1050 } 852 }
1051 853
1052 /** !! 854 late_initcall(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 855
1086 856
1087 static const char * const hibernation_modes[] 857 static const char * const hibernation_modes[] = {
1088 [HIBERNATION_PLATFORM] = "platform", 858 [HIBERNATION_PLATFORM] = "platform",
1089 [HIBERNATION_SHUTDOWN] = "shutdown", 859 [HIBERNATION_SHUTDOWN] = "shutdown",
1090 [HIBERNATION_REBOOT] = "reboot", 860 [HIBERNATION_REBOOT] = "reboot",
1091 #ifdef CONFIG_SUSPEND 861 #ifdef CONFIG_SUSPEND
1092 [HIBERNATION_SUSPEND] = "suspend", 862 [HIBERNATION_SUSPEND] = "suspend",
1093 #endif 863 #endif
1094 [HIBERNATION_TEST_RESUME] = "te <<
1095 }; 864 };
1096 865
1097 /* 866 /*
1098 * /sys/power/disk - Control hibernation mode 867 * /sys/power/disk - Control hibernation mode.
1099 * 868 *
1100 * Hibernation can be handled in several ways 869 * Hibernation can be handled in several ways. There are a few different ways
1101 * to put the system into the sleep state: us 870 * to put the system into the sleep state: using the platform driver (e.g. ACPI
1102 * or other hibernation_ops), powering it off 871 * or other hibernation_ops), powering it off or rebooting it (for testing
1103 * mostly). 872 * mostly).
1104 * 873 *
1105 * The sysfs file /sys/power/disk provides an 874 * The sysfs file /sys/power/disk provides an interface for selecting the
1106 * hibernation mode to use. Reading from thi 875 * hibernation mode to use. Reading from this file causes the available modes
1107 * to be printed. There are 3 modes that can 876 * to be printed. There are 3 modes that can be supported:
1108 * 877 *
1109 * 'platform' 878 * 'platform'
1110 * 'shutdown' 879 * 'shutdown'
1111 * 'reboot' 880 * 'reboot'
1112 * 881 *
1113 * If a platform hibernation driver is in use 882 * If a platform hibernation driver is in use, 'platform' will be supported
1114 * and will be used by default. Otherwise, ' 883 * and will be used by default. Otherwise, 'shutdown' will be used by default.
1115 * The selected option (i.e. the one correspo 884 * The selected option (i.e. the one corresponding to the current value of
1116 * hibernation_mode) is enclosed by a square 885 * hibernation_mode) is enclosed by a square bracket.
1117 * 886 *
1118 * To select a given hibernation mode it is n 887 * To select a given hibernation mode it is necessary to write the mode's
1119 * string representation (as returned by read 888 * string representation (as returned by reading from /sys/power/disk) back
1120 * into /sys/power/disk. 889 * into /sys/power/disk.
1121 */ 890 */
1122 891
1123 static ssize_t disk_show(struct kobject *kobj 892 static ssize_t disk_show(struct kobject *kobj, struct kobj_attribute *attr,
1124 char *buf) 893 char *buf)
1125 { 894 {
1126 ssize_t count = 0; <<
1127 int i; 895 int i;
1128 !! 896 char *start = buf;
1129 if (!hibernation_available()) <<
1130 return sysfs_emit(buf, "[disa <<
1131 897
1132 for (i = HIBERNATION_FIRST; i <= HIBE 898 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1133 if (!hibernation_modes[i]) 899 if (!hibernation_modes[i])
1134 continue; 900 continue;
1135 switch (i) { 901 switch (i) {
1136 case HIBERNATION_SHUTDOWN: 902 case HIBERNATION_SHUTDOWN:
1137 case HIBERNATION_REBOOT: 903 case HIBERNATION_REBOOT:
1138 #ifdef CONFIG_SUSPEND 904 #ifdef CONFIG_SUSPEND
1139 case HIBERNATION_SUSPEND: 905 case HIBERNATION_SUSPEND:
1140 #endif 906 #endif
1141 case HIBERNATION_TEST_RESUME: <<
1142 break; 907 break;
1143 case HIBERNATION_PLATFORM: 908 case HIBERNATION_PLATFORM:
1144 if (hibernation_ops) 909 if (hibernation_ops)
1145 break; 910 break;
1146 /* not a valid mode, 911 /* not a valid mode, continue with loop */
1147 continue; 912 continue;
1148 } 913 }
1149 if (i == hibernation_mode) 914 if (i == hibernation_mode)
1150 count += sysfs_emit_a !! 915 buf += sprintf(buf, "[%s] ", hibernation_modes[i]);
1151 else 916 else
1152 count += sysfs_emit_a !! 917 buf += sprintf(buf, "%s ", hibernation_modes[i]);
1153 } 918 }
1154 !! 919 buf += sprintf(buf, "\n");
1155 /* Convert the last space to a newlin !! 920 return buf-start;
1156 if (count > 0) <<
1157 buf[count - 1] = '\n'; <<
1158 <<
1159 return count; <<
1160 } 921 }
1161 922
1162 static ssize_t disk_store(struct kobject *kob 923 static ssize_t disk_store(struct kobject *kobj, struct kobj_attribute *attr,
1163 const char *buf, si 924 const char *buf, size_t n)
1164 { 925 {
1165 int mode = HIBERNATION_INVALID; <<
1166 unsigned int sleep_flags; <<
1167 int error = 0; 926 int error = 0;
>> 927 int i;
1168 int len; 928 int len;
1169 char *p; 929 char *p;
1170 int i; !! 930 int mode = HIBERNATION_INVALID;
1171 <<
1172 if (!hibernation_available()) <<
1173 return -EPERM; <<
1174 931
1175 p = memchr(buf, '\n', n); 932 p = memchr(buf, '\n', n);
1176 len = p ? p - buf : n; 933 len = p ? p - buf : n;
1177 934
1178 sleep_flags = lock_system_sleep(); !! 935 lock_system_sleep();
1179 for (i = HIBERNATION_FIRST; i <= HIBE 936 for (i = HIBERNATION_FIRST; i <= HIBERNATION_MAX; i++) {
1180 if (len == strlen(hibernation 937 if (len == strlen(hibernation_modes[i])
1181 && !strncmp(buf, hibernat 938 && !strncmp(buf, hibernation_modes[i], len)) {
1182 mode = i; 939 mode = i;
1183 break; 940 break;
1184 } 941 }
1185 } 942 }
1186 if (mode != HIBERNATION_INVALID) { 943 if (mode != HIBERNATION_INVALID) {
1187 switch (mode) { 944 switch (mode) {
1188 case HIBERNATION_SHUTDOWN: 945 case HIBERNATION_SHUTDOWN:
1189 case HIBERNATION_REBOOT: 946 case HIBERNATION_REBOOT:
1190 #ifdef CONFIG_SUSPEND 947 #ifdef CONFIG_SUSPEND
1191 case HIBERNATION_SUSPEND: 948 case HIBERNATION_SUSPEND:
1192 #endif 949 #endif
1193 case HIBERNATION_TEST_RESUME: <<
1194 hibernation_mode = mo 950 hibernation_mode = mode;
1195 break; 951 break;
1196 case HIBERNATION_PLATFORM: 952 case HIBERNATION_PLATFORM:
1197 if (hibernation_ops) 953 if (hibernation_ops)
1198 hibernation_m 954 hibernation_mode = mode;
1199 else 955 else
1200 error = -EINV 956 error = -EINVAL;
1201 } 957 }
1202 } else 958 } else
1203 error = -EINVAL; 959 error = -EINVAL;
1204 960
1205 if (!error) 961 if (!error)
1206 pm_pr_dbg("Hibernation mode s !! 962 pr_debug("PM: Hibernation mode set to '%s'\n",
1207 hibernation_mo !! 963 hibernation_modes[mode]);
1208 unlock_system_sleep(sleep_flags); !! 964 unlock_system_sleep();
1209 return error ? error : n; 965 return error ? error : n;
1210 } 966 }
1211 967
1212 power_attr(disk); 968 power_attr(disk);
1213 969
1214 static ssize_t resume_show(struct kobject *ko 970 static ssize_t resume_show(struct kobject *kobj, struct kobj_attribute *attr,
1215 char *buf) 971 char *buf)
1216 { 972 {
1217 return sysfs_emit(buf, "%d:%d\n", MAJ !! 973 return sprintf(buf,"%d:%d\n", MAJOR(swsusp_resume_device),
1218 MINOR(swsusp_resume !! 974 MINOR(swsusp_resume_device));
1219 } 975 }
1220 976
1221 static ssize_t resume_store(struct kobject *k 977 static ssize_t resume_store(struct kobject *kobj, struct kobj_attribute *attr,
1222 const char *buf, 978 const char *buf, size_t n)
1223 { 979 {
1224 unsigned int sleep_flags; !! 980 unsigned int maj, min;
1225 int len = n; !! 981 dev_t res;
1226 char *name; !! 982 int ret = -EINVAL;
1227 dev_t dev; !! 983
1228 int error; !! 984 if (sscanf(buf, "%u:%u", &maj, &min) != 2)
1229 !! 985 goto out;
1230 if (!hibernation_available()) !! 986
1231 return n; !! 987 res = MKDEV(maj,min);
1232 !! 988 if (maj != MAJOR(res) || min != MINOR(res))
1233 if (len && buf[len-1] == '\n') !! 989 goto out;
1234 len--; !! 990
1235 name = kstrndup(buf, len, GFP_KERNEL) !! 991 lock_system_sleep();
1236 if (!name) !! 992 swsusp_resume_device = res;
1237 return -ENOMEM; !! 993 unlock_system_sleep();
1238 !! 994 printk(KERN_INFO "PM: Starting manual resume from disk\n");
1239 error = lookup_bdev(name, &dev); <<
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); <<
1258 if (error) <<
1259 return error; <<
1260 <<
1261 sleep_flags = lock_system_sleep(); <<
1262 swsusp_resume_device = dev; <<
1263 unlock_system_sleep(sleep_flags); <<
1264 <<
1265 pm_pr_dbg("Configured hibernation res <<
1266 swsusp_resume_device); <<
1267 noresume = 0; 995 noresume = 0;
1268 software_resume(); 996 software_resume();
1269 return n; !! 997 ret = n;
>> 998 out:
>> 999 return ret;
1270 } 1000 }
1271 1001
1272 power_attr(resume); 1002 power_attr(resume);
1273 1003
1274 static ssize_t resume_offset_show(struct kobj <<
1275 struct kobj <<
1276 { <<
1277 return sysfs_emit(buf, "%llu\n", (uns <<
1278 } <<
1279 <<
1280 static ssize_t resume_offset_store(struct kob <<
1281 struct kob <<
1282 size_t n) <<
1283 { <<
1284 unsigned long long offset; <<
1285 int rc; <<
1286 <<
1287 rc = kstrtoull(buf, 0, &offset); <<
1288 if (rc) <<
1289 return rc; <<
1290 swsusp_resume_block = offset; <<
1291 <<
1292 return n; <<
1293 } <<
1294 <<
1295 power_attr(resume_offset); <<
1296 <<
1297 static ssize_t image_size_show(struct kobject 1004 static ssize_t image_size_show(struct kobject *kobj, struct kobj_attribute *attr,
1298 char *buf) 1005 char *buf)
1299 { 1006 {
1300 return sysfs_emit(buf, "%lu\n", image !! 1007 return sprintf(buf, "%lu\n", image_size);
1301 } 1008 }
1302 1009
1303 static ssize_t image_size_store(struct kobjec 1010 static ssize_t image_size_store(struct kobject *kobj, struct kobj_attribute *attr,
1304 const char *b 1011 const char *buf, size_t n)
1305 { 1012 {
1306 unsigned long size; 1013 unsigned long size;
1307 1014
1308 if (sscanf(buf, "%lu", &size) == 1) { 1015 if (sscanf(buf, "%lu", &size) == 1) {
1309 image_size = size; 1016 image_size = size;
1310 return n; 1017 return n;
1311 } 1018 }
1312 1019
1313 return -EINVAL; 1020 return -EINVAL;
1314 } 1021 }
1315 1022
1316 power_attr(image_size); 1023 power_attr(image_size);
1317 1024
1318 static ssize_t reserved_size_show(struct kobj 1025 static ssize_t reserved_size_show(struct kobject *kobj,
1319 struct kobj 1026 struct kobj_attribute *attr, char *buf)
1320 { 1027 {
1321 return sysfs_emit(buf, "%lu\n", reser !! 1028 return sprintf(buf, "%lu\n", reserved_size);
1322 } 1029 }
1323 1030
1324 static ssize_t reserved_size_store(struct kob 1031 static ssize_t reserved_size_store(struct kobject *kobj,
1325 struct kob 1032 struct kobj_attribute *attr,
1326 const char 1033 const char *buf, size_t n)
1327 { 1034 {
1328 unsigned long size; 1035 unsigned long size;
1329 1036
1330 if (sscanf(buf, "%lu", &size) == 1) { 1037 if (sscanf(buf, "%lu", &size) == 1) {
1331 reserved_size = size; 1038 reserved_size = size;
1332 return n; 1039 return n;
1333 } 1040 }
1334 1041
1335 return -EINVAL; 1042 return -EINVAL;
1336 } 1043 }
1337 1044
1338 power_attr(reserved_size); 1045 power_attr(reserved_size);
1339 1046
1340 static struct attribute *g[] = { !! 1047 static struct attribute * g[] = {
1341 &disk_attr.attr, 1048 &disk_attr.attr,
1342 &resume_offset_attr.attr, <<
1343 &resume_attr.attr, 1049 &resume_attr.attr,
1344 &image_size_attr.attr, 1050 &image_size_attr.attr,
1345 &reserved_size_attr.attr, 1051 &reserved_size_attr.attr,
1346 NULL, 1052 NULL,
1347 }; 1053 };
1348 1054
1349 1055
1350 static const struct attribute_group attr_grou !! 1056 static struct attribute_group attr_group = {
1351 .attrs = g, 1057 .attrs = g,
1352 }; 1058 };
1353 1059
1354 1060
1355 static int __init pm_disk_init(void) 1061 static int __init pm_disk_init(void)
1356 { 1062 {
1357 return sysfs_create_group(power_kobj, 1063 return sysfs_create_group(power_kobj, &attr_group);
1358 } 1064 }
1359 1065
1360 core_initcall(pm_disk_init); 1066 core_initcall(pm_disk_init);
1361 1067
1362 1068
1363 static int __init resume_setup(char *str) 1069 static int __init resume_setup(char *str)
1364 { 1070 {
1365 if (noresume) 1071 if (noresume)
1366 return 1; 1072 return 1;
1367 1073
1368 strscpy(resume_file, str); !! 1074 strncpy( resume_file, str, 255 );
1369 return 1; 1075 return 1;
1370 } 1076 }
1371 1077
1372 static int __init resume_offset_setup(char *s 1078 static int __init resume_offset_setup(char *str)
1373 { 1079 {
1374 unsigned long long offset; 1080 unsigned long long offset;
1375 1081
1376 if (noresume) 1082 if (noresume)
1377 return 1; 1083 return 1;
1378 1084
1379 if (sscanf(str, "%llu", &offset) == 1 1085 if (sscanf(str, "%llu", &offset) == 1)
1380 swsusp_resume_block = offset; 1086 swsusp_resume_block = offset;
1381 1087
1382 return 1; 1088 return 1;
1383 } 1089 }
1384 1090
1385 static int __init hibernate_setup(char *str) 1091 static int __init hibernate_setup(char *str)
1386 { 1092 {
1387 if (!strncmp(str, "noresume", 8)) { !! 1093 if (!strncmp(str, "noresume", 8))
1388 noresume = 1; 1094 noresume = 1;
1389 } else if (!strncmp(str, "nocompress" !! 1095 else if (!strncmp(str, "nocompress", 10))
1390 nocompress = 1; 1096 nocompress = 1;
1391 } else if (!strncmp(str, "no", 2)) { <<
1392 noresume = 1; <<
1393 nohibernate = 1; <<
1394 } else if (IS_ENABLED(CONFIG_STRICT_K <<
1395 && !strncmp(str, "protect_ <<
1396 enable_restore_image_protecti <<
1397 } <<
1398 return 1; 1097 return 1;
1399 } 1098 }
1400 1099
1401 static int __init noresume_setup(char *str) 1100 static int __init noresume_setup(char *str)
1402 { 1101 {
1403 noresume = 1; 1102 noresume = 1;
1404 return 1; 1103 return 1;
1405 } 1104 }
1406 1105
1407 static int __init resumewait_setup(char *str) 1106 static int __init resumewait_setup(char *str)
1408 { 1107 {
1409 resume_wait = 1; 1108 resume_wait = 1;
1410 return 1; 1109 return 1;
1411 } 1110 }
1412 1111
1413 static int __init resumedelay_setup(char *str 1112 static int __init resumedelay_setup(char *str)
1414 { 1113 {
1415 int rc = kstrtouint(str, 0, &resume_d !! 1114 resume_delay = simple_strtoul(str, NULL, 0);
1416 <<
1417 if (rc) <<
1418 pr_warn("resumedelay: bad opt <<
1419 return 1; 1115 return 1;
1420 } 1116 }
1421 1117
1422 static int __init nohibernate_setup(char *str <<
1423 { <<
1424 noresume = 1; <<
1425 nohibernate = 1; <<
1426 return 1; <<
1427 } <<
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 <<
1480 __setup("noresume", noresume_setup); 1118 __setup("noresume", noresume_setup);
1481 __setup("resume_offset=", resume_offset_setup 1119 __setup("resume_offset=", resume_offset_setup);
1482 __setup("resume=", resume_setup); 1120 __setup("resume=", resume_setup);
1483 __setup("hibernate=", hibernate_setup); 1121 __setup("hibernate=", hibernate_setup);
1484 __setup("resumewait", resumewait_setup); 1122 __setup("resumewait", resumewait_setup);
1485 __setup("resumedelay=", resumedelay_setup); 1123 __setup("resumedelay=", resumedelay_setup);
1486 __setup("nohibernate", nohibernate_setup); <<
1487 1124
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