1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * kernel/power/main.c - PM subsystem core functionality. 4 * 5 * Copyright (c) 2003 Patrick Mochel 6 * Copyright (c) 2003 Open Source Development Lab 7 */ 8 9 #include <linux/export.h> 10 #include <linux/kobject.h> 11 #include <linux/string.h> 12 #include <linux/pm-trace.h> 13 #include <linux/workqueue.h> 14 #include <linux/debugfs.h> 15 #include <linux/seq_file.h> 16 #include <linux/suspend.h> 17 #include <linux/syscalls.h> 18 #include <linux/pm_runtime.h> 19 20 #include "power.h" 21 22 #ifdef CONFIG_PM_SLEEP 23 24 void lock_system_sleep(void) 25 { 26 current->flags |= PF_FREEZER_SKIP; 27 mutex_lock(&system_transition_mutex); 28 } 29 EXPORT_SYMBOL_GPL(lock_system_sleep); 30 31 void unlock_system_sleep(void) 32 { 33 /* 34 * Don't use freezer_count() because we don't want the call to 35 * try_to_freeze() here. 36 * 37 * Reason: 38 * Fundamentally, we just don't need it, because freezing condition 39 * doesn't come into effect until we release the 40 * system_transition_mutex lock, since the freezer always works with 41 * system_transition_mutex held. 42 * 43 * More importantly, in the case of hibernation, 44 * unlock_system_sleep() gets called in snapshot_read() and 45 * snapshot_write() when the freezing condition is still in effect. 46 * Which means, if we use try_to_freeze() here, it would make them 47 * enter the refrigerator, thus causing hibernation to lockup. 48 */ 49 current->flags &= ~PF_FREEZER_SKIP; 50 mutex_unlock(&system_transition_mutex); 51 } 52 EXPORT_SYMBOL_GPL(unlock_system_sleep); 53 54 void ksys_sync_helper(void) 55 { 56 ktime_t start; 57 long elapsed_msecs; 58 59 start = ktime_get(); 60 ksys_sync(); 61 elapsed_msecs = ktime_to_ms(ktime_sub(ktime_get(), start)); 62 pr_info("Filesystems sync: %ld.%03ld seconds\n", 63 elapsed_msecs / MSEC_PER_SEC, elapsed_msecs % MSEC_PER_SEC); 64 } 65 EXPORT_SYMBOL_GPL(ksys_sync_helper); 66 67 /* Routines for PM-transition notifications */ 68 69 static BLOCKING_NOTIFIER_HEAD(pm_chain_head); 70 71 int register_pm_notifier(struct notifier_block *nb) 72 { 73 return blocking_notifier_chain_register(&pm_chain_head, nb); 74 } 75 EXPORT_SYMBOL_GPL(register_pm_notifier); 76 77 int unregister_pm_notifier(struct notifier_block *nb) 78 { 79 return blocking_notifier_chain_unregister(&pm_chain_head, nb); 80 } 81 EXPORT_SYMBOL_GPL(unregister_pm_notifier); 82 83 int pm_notifier_call_chain_robust(unsigned long val_up, unsigned long val_down) 84 { 85 int ret; 86 87 ret = blocking_notifier_call_chain_robust(&pm_chain_head, val_up, val_down, NULL); 88 89 return notifier_to_errno(ret); 90 } 91 92 int pm_notifier_call_chain(unsigned long val) 93 { 94 return blocking_notifier_call_chain(&pm_chain_head, val, NULL); 95 } 96 97 /* If set, devices may be suspended and resumed asynchronously. */ 98 int pm_async_enabled = 1; 99 100 static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, 101 char *buf) 102 { 103 return sprintf(buf, "%d\n", pm_async_enabled); 104 } 105 106 static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, 107 const char *buf, size_t n) 108 { 109 unsigned long val; 110 111 if (kstrtoul(buf, 10, &val)) 112 return -EINVAL; 113 114 if (val > 1) 115 return -EINVAL; 116 117 pm_async_enabled = val; 118 return n; 119 } 120 121 power_attr(pm_async); 122 123 #ifdef CONFIG_SUSPEND 124 static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, 125 char *buf) 126 { 127 char *s = buf; 128 suspend_state_t i; 129 130 for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) { 131 if (i >= PM_SUSPEND_MEM && cxl_mem_active()) 132 continue; 133 if (mem_sleep_states[i]) { 134 const char *label = mem_sleep_states[i]; 135 136 if (mem_sleep_current == i) 137 s += sprintf(s, "[%s] ", label); 138 else 139 s += sprintf(s, "%s ", label); 140 } 141 } 142 143 /* Convert the last space to a newline if needed. */ 144 if (s != buf) 145 *(s-1) = '\n'; 146 147 return (s - buf); 148 } 149 150 static suspend_state_t decode_suspend_state(const char *buf, size_t n) 151 { 152 suspend_state_t state; 153 char *p; 154 int len; 155 156 p = memchr(buf, '\n', n); 157 len = p ? p - buf : n; 158 159 for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { 160 const char *label = mem_sleep_states[state]; 161 162 if (label && len == strlen(label) && !strncmp(buf, label, len)) 163 return state; 164 } 165 166 return PM_SUSPEND_ON; 167 } 168 169 static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, 170 const char *buf, size_t n) 171 { 172 suspend_state_t state; 173 int error; 174 175 error = pm_autosleep_lock(); 176 if (error) 177 return error; 178 179 if (pm_autosleep_state() > PM_SUSPEND_ON) { 180 error = -EBUSY; 181 goto out; 182 } 183 184 state = decode_suspend_state(buf, n); 185 if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) 186 mem_sleep_current = state; 187 else 188 error = -EINVAL; 189 190 out: 191 pm_autosleep_unlock(); 192 return error ? error : n; 193 } 194 195 power_attr(mem_sleep); 196 197 /* 198 * sync_on_suspend: invoke ksys_sync_helper() before suspend. 199 * 200 * show() returns whether ksys_sync_helper() is invoked before suspend. 201 * store() accepts 0 or 1. 0 disables ksys_sync_helper() and 1 enables it. 202 */ 203 bool sync_on_suspend_enabled = !IS_ENABLED(CONFIG_SUSPEND_SKIP_SYNC); 204 205 static ssize_t sync_on_suspend_show(struct kobject *kobj, 206 struct kobj_attribute *attr, char *buf) 207 { 208 return sprintf(buf, "%d\n", sync_on_suspend_enabled); 209 } 210 211 static ssize_t sync_on_suspend_store(struct kobject *kobj, 212 struct kobj_attribute *attr, 213 const char *buf, size_t n) 214 { 215 unsigned long val; 216 217 if (kstrtoul(buf, 10, &val)) 218 return -EINVAL; 219 220 if (val > 1) 221 return -EINVAL; 222 223 sync_on_suspend_enabled = !!val; 224 return n; 225 } 226 227 power_attr(sync_on_suspend); 228 #endif /* CONFIG_SUSPEND */ 229 230 #ifdef CONFIG_PM_SLEEP_DEBUG 231 int pm_test_level = TEST_NONE; 232 233 static const char * const pm_tests[__TEST_AFTER_LAST] = { 234 [TEST_NONE] = "none", 235 [TEST_CORE] = "core", 236 [TEST_CPUS] = "processors", 237 [TEST_PLATFORM] = "platform", 238 [TEST_DEVICES] = "devices", 239 [TEST_FREEZER] = "freezer", 240 }; 241 242 static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, 243 char *buf) 244 { 245 char *s = buf; 246 int level; 247 248 for (level = TEST_FIRST; level <= TEST_MAX; level++) 249 if (pm_tests[level]) { 250 if (level == pm_test_level) 251 s += sprintf(s, "[%s] ", pm_tests[level]); 252 else 253 s += sprintf(s, "%s ", pm_tests[level]); 254 } 255 256 if (s != buf) 257 /* convert the last space to a newline */ 258 *(s-1) = '\n'; 259 260 return (s - buf); 261 } 262 263 static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, 264 const char *buf, size_t n) 265 { 266 const char * const *s; 267 int level; 268 char *p; 269 int len; 270 int error = -EINVAL; 271 272 p = memchr(buf, '\n', n); 273 len = p ? p - buf : n; 274 275 lock_system_sleep(); 276 277 level = TEST_FIRST; 278 for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) 279 if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { 280 pm_test_level = level; 281 error = 0; 282 break; 283 } 284 285 unlock_system_sleep(); 286 287 return error ? error : n; 288 } 289 290 power_attr(pm_test); 291 #endif /* CONFIG_PM_SLEEP_DEBUG */ 292 293 static char *suspend_step_name(enum suspend_stat_step step) 294 { 295 switch (step) { 296 case SUSPEND_FREEZE: 297 return "freeze"; 298 case SUSPEND_PREPARE: 299 return "prepare"; 300 case SUSPEND_SUSPEND: 301 return "suspend"; 302 case SUSPEND_SUSPEND_NOIRQ: 303 return "suspend_noirq"; 304 case SUSPEND_RESUME_NOIRQ: 305 return "resume_noirq"; 306 case SUSPEND_RESUME: 307 return "resume"; 308 default: 309 return ""; 310 } 311 } 312 313 #define suspend_attr(_name) \ 314 static ssize_t _name##_show(struct kobject *kobj, \ 315 struct kobj_attribute *attr, char *buf) \ 316 { \ 317 return sprintf(buf, "%d\n", suspend_stats._name); \ 318 } \ 319 static struct kobj_attribute _name = __ATTR_RO(_name) 320 321 suspend_attr(success); 322 suspend_attr(fail); 323 suspend_attr(failed_freeze); 324 suspend_attr(failed_prepare); 325 suspend_attr(failed_suspend); 326 suspend_attr(failed_suspend_late); 327 suspend_attr(failed_suspend_noirq); 328 suspend_attr(failed_resume); 329 suspend_attr(failed_resume_early); 330 suspend_attr(failed_resume_noirq); 331 332 static ssize_t last_failed_dev_show(struct kobject *kobj, 333 struct kobj_attribute *attr, char *buf) 334 { 335 int index; 336 char *last_failed_dev = NULL; 337 338 index = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; 339 index %= REC_FAILED_NUM; 340 last_failed_dev = suspend_stats.failed_devs[index]; 341 342 return sprintf(buf, "%s\n", last_failed_dev); 343 } 344 static struct kobj_attribute last_failed_dev = __ATTR_RO(last_failed_dev); 345 346 static ssize_t last_failed_errno_show(struct kobject *kobj, 347 struct kobj_attribute *attr, char *buf) 348 { 349 int index; 350 int last_failed_errno; 351 352 index = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; 353 index %= REC_FAILED_NUM; 354 last_failed_errno = suspend_stats.errno[index]; 355 356 return sprintf(buf, "%d\n", last_failed_errno); 357 } 358 static struct kobj_attribute last_failed_errno = __ATTR_RO(last_failed_errno); 359 360 static ssize_t last_failed_step_show(struct kobject *kobj, 361 struct kobj_attribute *attr, char *buf) 362 { 363 int index; 364 enum suspend_stat_step step; 365 char *last_failed_step = NULL; 366 367 index = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; 368 index %= REC_FAILED_NUM; 369 step = suspend_stats.failed_steps[index]; 370 last_failed_step = suspend_step_name(step); 371 372 return sprintf(buf, "%s\n", last_failed_step); 373 } 374 static struct kobj_attribute last_failed_step = __ATTR_RO(last_failed_step); 375 376 static struct attribute *suspend_attrs[] = { 377 &success.attr, 378 &fail.attr, 379 &failed_freeze.attr, 380 &failed_prepare.attr, 381 &failed_suspend.attr, 382 &failed_suspend_late.attr, 383 &failed_suspend_noirq.attr, 384 &failed_resume.attr, 385 &failed_resume_early.attr, 386 &failed_resume_noirq.attr, 387 &last_failed_dev.attr, 388 &last_failed_errno.attr, 389 &last_failed_step.attr, 390 NULL, 391 }; 392 393 static const struct attribute_group suspend_attr_group = { 394 .name = "suspend_stats", 395 .attrs = suspend_attrs, 396 }; 397 398 #ifdef CONFIG_DEBUG_FS 399 static int suspend_stats_show(struct seq_file *s, void *unused) 400 { 401 int i, index, last_dev, last_errno, last_step; 402 403 last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; 404 last_dev %= REC_FAILED_NUM; 405 last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; 406 last_errno %= REC_FAILED_NUM; 407 last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; 408 last_step %= REC_FAILED_NUM; 409 seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" 410 "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", 411 "success", suspend_stats.success, 412 "fail", suspend_stats.fail, 413 "failed_freeze", suspend_stats.failed_freeze, 414 "failed_prepare", suspend_stats.failed_prepare, 415 "failed_suspend", suspend_stats.failed_suspend, 416 "failed_suspend_late", 417 suspend_stats.failed_suspend_late, 418 "failed_suspend_noirq", 419 suspend_stats.failed_suspend_noirq, 420 "failed_resume", suspend_stats.failed_resume, 421 "failed_resume_early", 422 suspend_stats.failed_resume_early, 423 "failed_resume_noirq", 424 suspend_stats.failed_resume_noirq); 425 seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", 426 suspend_stats.failed_devs[last_dev]); 427 for (i = 1; i < REC_FAILED_NUM; i++) { 428 index = last_dev + REC_FAILED_NUM - i; 429 index %= REC_FAILED_NUM; 430 seq_printf(s, "\t\t\t%-s\n", 431 suspend_stats.failed_devs[index]); 432 } 433 seq_printf(s, " last_failed_errno:\t%-d\n", 434 suspend_stats.errno[last_errno]); 435 for (i = 1; i < REC_FAILED_NUM; i++) { 436 index = last_errno + REC_FAILED_NUM - i; 437 index %= REC_FAILED_NUM; 438 seq_printf(s, "\t\t\t%-d\n", 439 suspend_stats.errno[index]); 440 } 441 seq_printf(s, " last_failed_step:\t%-s\n", 442 suspend_step_name( 443 suspend_stats.failed_steps[last_step])); 444 for (i = 1; i < REC_FAILED_NUM; i++) { 445 index = last_step + REC_FAILED_NUM - i; 446 index %= REC_FAILED_NUM; 447 seq_printf(s, "\t\t\t%-s\n", 448 suspend_step_name( 449 suspend_stats.failed_steps[index])); 450 } 451 452 return 0; 453 } 454 DEFINE_SHOW_ATTRIBUTE(suspend_stats); 455 456 static int __init pm_debugfs_init(void) 457 { 458 debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, 459 NULL, NULL, &suspend_stats_fops); 460 return 0; 461 } 462 463 late_initcall(pm_debugfs_init); 464 #endif /* CONFIG_DEBUG_FS */ 465 466 #endif /* CONFIG_PM_SLEEP */ 467 468 #ifdef CONFIG_PM_SLEEP_DEBUG 469 /* 470 * pm_print_times: print time taken by devices to suspend and resume. 471 * 472 * show() returns whether printing of suspend and resume times is enabled. 473 * store() accepts 0 or 1. 0 disables printing and 1 enables it. 474 */ 475 bool pm_print_times_enabled; 476 477 static ssize_t pm_print_times_show(struct kobject *kobj, 478 struct kobj_attribute *attr, char *buf) 479 { 480 return sprintf(buf, "%d\n", pm_print_times_enabled); 481 } 482 483 static ssize_t pm_print_times_store(struct kobject *kobj, 484 struct kobj_attribute *attr, 485 const char *buf, size_t n) 486 { 487 unsigned long val; 488 489 if (kstrtoul(buf, 10, &val)) 490 return -EINVAL; 491 492 if (val > 1) 493 return -EINVAL; 494 495 pm_print_times_enabled = !!val; 496 return n; 497 } 498 499 power_attr(pm_print_times); 500 501 static inline void pm_print_times_init(void) 502 { 503 pm_print_times_enabled = !!initcall_debug; 504 } 505 506 static ssize_t pm_wakeup_irq_show(struct kobject *kobj, 507 struct kobj_attribute *attr, 508 char *buf) 509 { 510 if (!pm_wakeup_irq()) 511 return -ENODATA; 512 513 return sprintf(buf, "%u\n", pm_wakeup_irq()); 514 } 515 516 power_attr_ro(pm_wakeup_irq); 517 518 bool pm_debug_messages_on __read_mostly; 519 520 static ssize_t pm_debug_messages_show(struct kobject *kobj, 521 struct kobj_attribute *attr, char *buf) 522 { 523 return sprintf(buf, "%d\n", pm_debug_messages_on); 524 } 525 526 static ssize_t pm_debug_messages_store(struct kobject *kobj, 527 struct kobj_attribute *attr, 528 const char *buf, size_t n) 529 { 530 unsigned long val; 531 532 if (kstrtoul(buf, 10, &val)) 533 return -EINVAL; 534 535 if (val > 1) 536 return -EINVAL; 537 538 pm_debug_messages_on = !!val; 539 return n; 540 } 541 542 power_attr(pm_debug_messages); 543 544 static int __init pm_debug_messages_setup(char *str) 545 { 546 pm_debug_messages_on = true; 547 return 1; 548 } 549 __setup("pm_debug_messages", pm_debug_messages_setup); 550 551 #else /* !CONFIG_PM_SLEEP_DEBUG */ 552 static inline void pm_print_times_init(void) {} 553 #endif /* CONFIG_PM_SLEEP_DEBUG */ 554 555 struct kobject *power_kobj; 556 557 /* 558 * state - control system sleep states. 559 * 560 * show() returns available sleep state labels, which may be "mem", "standby", 561 * "freeze" and "disk" (hibernation). 562 * See Documentation/admin-guide/pm/sleep-states.rst for a description of 563 * what they mean. 564 * 565 * store() accepts one of those strings, translates it into the proper 566 * enumerated value, and initiates a suspend transition. 567 */ 568 static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, 569 char *buf) 570 { 571 char *s = buf; 572 #ifdef CONFIG_SUSPEND 573 suspend_state_t i; 574 575 for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) 576 if (pm_states[i]) 577 s += sprintf(s,"%s ", pm_states[i]); 578 579 #endif 580 if (hibernation_available()) 581 s += sprintf(s, "disk "); 582 if (s != buf) 583 /* convert the last space to a newline */ 584 *(s-1) = '\n'; 585 return (s - buf); 586 } 587 588 static suspend_state_t decode_state(const char *buf, size_t n) 589 { 590 #ifdef CONFIG_SUSPEND 591 suspend_state_t state; 592 #endif 593 char *p; 594 int len; 595 596 p = memchr(buf, '\n', n); 597 len = p ? p - buf : n; 598 599 /* Check hibernation first. */ 600 if (len == 4 && str_has_prefix(buf, "disk")) 601 return PM_SUSPEND_MAX; 602 603 #ifdef CONFIG_SUSPEND 604 for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { 605 const char *label = pm_states[state]; 606 607 if (label && len == strlen(label) && !strncmp(buf, label, len)) 608 return state; 609 } 610 #endif 611 612 return PM_SUSPEND_ON; 613 } 614 615 static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, 616 const char *buf, size_t n) 617 { 618 suspend_state_t state; 619 int error; 620 621 error = pm_autosleep_lock(); 622 if (error) 623 return error; 624 625 if (pm_autosleep_state() > PM_SUSPEND_ON) { 626 error = -EBUSY; 627 goto out; 628 } 629 630 state = decode_state(buf, n); 631 if (state < PM_SUSPEND_MAX) { 632 if (state == PM_SUSPEND_MEM) 633 state = mem_sleep_current; 634 635 error = pm_suspend(state); 636 } else if (state == PM_SUSPEND_MAX) { 637 error = hibernate(); 638 } else { 639 error = -EINVAL; 640 } 641 642 out: 643 pm_autosleep_unlock(); 644 return error ? error : n; 645 } 646 647 power_attr(state); 648 649 #ifdef CONFIG_PM_SLEEP 650 /* 651 * The 'wakeup_count' attribute, along with the functions defined in 652 * drivers/base/power/wakeup.c, provides a means by which wakeup events can be 653 * handled in a non-racy way. 654 * 655 * If a wakeup event occurs when the system is in a sleep state, it simply is 656 * woken up. In turn, if an event that would wake the system up from a sleep 657 * state occurs when it is undergoing a transition to that sleep state, the 658 * transition should be aborted. Moreover, if such an event occurs when the 659 * system is in the working state, an attempt to start a transition to the 660 * given sleep state should fail during certain period after the detection of 661 * the event. Using the 'state' attribute alone is not sufficient to satisfy 662 * these requirements, because a wakeup event may occur exactly when 'state' 663 * is being written to and may be delivered to user space right before it is 664 * frozen, so the event will remain only partially processed until the system is 665 * woken up by another event. In particular, it won't cause the transition to 666 * a sleep state to be aborted. 667 * 668 * This difficulty may be overcome if user space uses 'wakeup_count' before 669 * writing to 'state'. It first should read from 'wakeup_count' and store 670 * the read value. Then, after carrying out its own preparations for the system 671 * transition to a sleep state, it should write the stored value to 672 * 'wakeup_count'. If that fails, at least one wakeup event has occurred since 673 * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it 674 * is allowed to write to 'state', but the transition will be aborted if there 675 * are any wakeup events detected after 'wakeup_count' was written to. 676 */ 677 678 static ssize_t wakeup_count_show(struct kobject *kobj, 679 struct kobj_attribute *attr, 680 char *buf) 681 { 682 unsigned int val; 683 684 return pm_get_wakeup_count(&val, true) ? 685 sprintf(buf, "%u\n", val) : -EINTR; 686 } 687 688 static ssize_t wakeup_count_store(struct kobject *kobj, 689 struct kobj_attribute *attr, 690 const char *buf, size_t n) 691 { 692 unsigned int val; 693 int error; 694 695 error = pm_autosleep_lock(); 696 if (error) 697 return error; 698 699 if (pm_autosleep_state() > PM_SUSPEND_ON) { 700 error = -EBUSY; 701 goto out; 702 } 703 704 error = -EINVAL; 705 if (sscanf(buf, "%u", &val) == 1) { 706 if (pm_save_wakeup_count(val)) 707 error = n; 708 else 709 pm_print_active_wakeup_sources(); 710 } 711 712 out: 713 pm_autosleep_unlock(); 714 return error; 715 } 716 717 power_attr(wakeup_count); 718 719 #ifdef CONFIG_PM_AUTOSLEEP 720 static ssize_t autosleep_show(struct kobject *kobj, 721 struct kobj_attribute *attr, 722 char *buf) 723 { 724 suspend_state_t state = pm_autosleep_state(); 725 726 if (state == PM_SUSPEND_ON) 727 return sprintf(buf, "off\n"); 728 729 #ifdef CONFIG_SUSPEND 730 if (state < PM_SUSPEND_MAX) 731 return sprintf(buf, "%s\n", pm_states[state] ? 732 pm_states[state] : "error"); 733 #endif 734 #ifdef CONFIG_HIBERNATION 735 return sprintf(buf, "disk\n"); 736 #else 737 return sprintf(buf, "error"); 738 #endif 739 } 740 741 static ssize_t autosleep_store(struct kobject *kobj, 742 struct kobj_attribute *attr, 743 const char *buf, size_t n) 744 { 745 suspend_state_t state = decode_state(buf, n); 746 int error; 747 748 if (state == PM_SUSPEND_ON 749 && strcmp(buf, "off") && strcmp(buf, "off\n")) 750 return -EINVAL; 751 752 if (state == PM_SUSPEND_MEM) 753 state = mem_sleep_current; 754 755 error = pm_autosleep_set_state(state); 756 return error ? error : n; 757 } 758 759 power_attr(autosleep); 760 #endif /* CONFIG_PM_AUTOSLEEP */ 761 762 #ifdef CONFIG_PM_WAKELOCKS 763 static ssize_t wake_lock_show(struct kobject *kobj, 764 struct kobj_attribute *attr, 765 char *buf) 766 { 767 return pm_show_wakelocks(buf, true); 768 } 769 770 static ssize_t wake_lock_store(struct kobject *kobj, 771 struct kobj_attribute *attr, 772 const char *buf, size_t n) 773 { 774 int error = pm_wake_lock(buf); 775 return error ? error : n; 776 } 777 778 power_attr(wake_lock); 779 780 static ssize_t wake_unlock_show(struct kobject *kobj, 781 struct kobj_attribute *attr, 782 char *buf) 783 { 784 return pm_show_wakelocks(buf, false); 785 } 786 787 static ssize_t wake_unlock_store(struct kobject *kobj, 788 struct kobj_attribute *attr, 789 const char *buf, size_t n) 790 { 791 int error = pm_wake_unlock(buf); 792 return error ? error : n; 793 } 794 795 power_attr(wake_unlock); 796 797 #endif /* CONFIG_PM_WAKELOCKS */ 798 #endif /* CONFIG_PM_SLEEP */ 799 800 #ifdef CONFIG_PM_TRACE 801 int pm_trace_enabled; 802 803 static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, 804 char *buf) 805 { 806 return sprintf(buf, "%d\n", pm_trace_enabled); 807 } 808 809 static ssize_t 810 pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, 811 const char *buf, size_t n) 812 { 813 int val; 814 815 if (sscanf(buf, "%d", &val) == 1) { 816 pm_trace_enabled = !!val; 817 if (pm_trace_enabled) { 818 pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" 819 "PM: Correct system time has to be restored manually after resume.\n"); 820 } 821 return n; 822 } 823 return -EINVAL; 824 } 825 826 power_attr(pm_trace); 827 828 static ssize_t pm_trace_dev_match_show(struct kobject *kobj, 829 struct kobj_attribute *attr, 830 char *buf) 831 { 832 return show_trace_dev_match(buf, PAGE_SIZE); 833 } 834 835 power_attr_ro(pm_trace_dev_match); 836 837 #endif /* CONFIG_PM_TRACE */ 838 839 #ifdef CONFIG_FREEZER 840 static ssize_t pm_freeze_timeout_show(struct kobject *kobj, 841 struct kobj_attribute *attr, char *buf) 842 { 843 return sprintf(buf, "%u\n", freeze_timeout_msecs); 844 } 845 846 static ssize_t pm_freeze_timeout_store(struct kobject *kobj, 847 struct kobj_attribute *attr, 848 const char *buf, size_t n) 849 { 850 unsigned long val; 851 852 if (kstrtoul(buf, 10, &val)) 853 return -EINVAL; 854 855 freeze_timeout_msecs = val; 856 return n; 857 } 858 859 power_attr(pm_freeze_timeout); 860 861 #endif /* CONFIG_FREEZER*/ 862 863 static struct attribute * g[] = { 864 &state_attr.attr, 865 #ifdef CONFIG_PM_TRACE 866 &pm_trace_attr.attr, 867 &pm_trace_dev_match_attr.attr, 868 #endif 869 #ifdef CONFIG_PM_SLEEP 870 &pm_async_attr.attr, 871 &wakeup_count_attr.attr, 872 #ifdef CONFIG_SUSPEND 873 &mem_sleep_attr.attr, 874 &sync_on_suspend_attr.attr, 875 #endif 876 #ifdef CONFIG_PM_AUTOSLEEP 877 &autosleep_attr.attr, 878 #endif 879 #ifdef CONFIG_PM_WAKELOCKS 880 &wake_lock_attr.attr, 881 &wake_unlock_attr.attr, 882 #endif 883 #ifdef CONFIG_PM_SLEEP_DEBUG 884 &pm_test_attr.attr, 885 &pm_print_times_attr.attr, 886 &pm_wakeup_irq_attr.attr, 887 &pm_debug_messages_attr.attr, 888 #endif 889 #endif 890 #ifdef CONFIG_FREEZER 891 &pm_freeze_timeout_attr.attr, 892 #endif 893 NULL, 894 }; 895 896 static const struct attribute_group attr_group = { 897 .attrs = g, 898 }; 899 900 static const struct attribute_group *attr_groups[] = { 901 &attr_group, 902 #ifdef CONFIG_PM_SLEEP 903 &suspend_attr_group, 904 #endif 905 NULL, 906 }; 907 908 struct workqueue_struct *pm_wq; 909 EXPORT_SYMBOL_GPL(pm_wq); 910 911 static int __init pm_start_workqueue(void) 912 { 913 pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); 914 915 return pm_wq ? 0 : -ENOMEM; 916 } 917 918 static int __init pm_init(void) 919 { 920 int error = pm_start_workqueue(); 921 if (error) 922 return error; 923 hibernate_image_size_init(); 924 hibernate_reserved_size_init(); 925 pm_states_init(); 926 power_kobj = kobject_create_and_add("power", NULL); 927 if (!power_kobj) 928 return -ENOMEM; 929 error = sysfs_create_groups(power_kobj, attr_groups); 930 if (error) 931 return error; 932 pm_print_times_init(); 933 return pm_autosleep_init(); 934 } 935 936 core_initcall(pm_init); 937