1 /* 2 * drivers/base/power/domain.c - Common code related to device power domains. 3 * 4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. 5 * 6 * This file is released under the GPLv2. 7 */ 8 9 #include <linux/kernel.h> 10 #include <linux/io.h> 11 #include <linux/pm_runtime.h> 12 #include <linux/pm_domain.h> 13 #include <linux/pm_qos.h> 14 #include <linux/slab.h> 15 #include <linux/err.h> 16 #include <linux/sched.h> 17 #include <linux/suspend.h> 18 #include <linux/export.h> 19 20 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ 21 ({ \ 22 type (*__routine)(struct device *__d); \ 23 type __ret = (type)0; \ 24 \ 25 __routine = genpd->dev_ops.callback; \ 26 if (__routine) { \ 27 __ret = __routine(dev); \ 28 } else { \ 29 __routine = dev_gpd_data(dev)->ops.callback; \ 30 if (__routine) \ 31 __ret = __routine(dev); \ 32 } \ 33 __ret; \ 34 }) 35 36 #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ 37 ({ \ 38 ktime_t __start = ktime_get(); \ 39 type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ 40 s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ 41 struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ 42 if (!__retval && __elapsed > __td->field) { \ 43 __td->field = __elapsed; \ 44 dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \ 45 __elapsed); \ 46 genpd->max_off_time_changed = true; \ 47 __td->constraint_changed = true; \ 48 } \ 49 __retval; \ 50 }) 51 52 static LIST_HEAD(gpd_list); 53 static DEFINE_MUTEX(gpd_list_lock); 54 55 static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) 56 { 57 struct generic_pm_domain *genpd = NULL, *gpd; 58 59 if (IS_ERR_OR_NULL(domain_name)) 60 return NULL; 61 62 mutex_lock(&gpd_list_lock); 63 list_for_each_entry(gpd, &gpd_list, gpd_list_node) { 64 if (!strcmp(gpd->name, domain_name)) { 65 genpd = gpd; 66 break; 67 } 68 } 69 mutex_unlock(&gpd_list_lock); 70 return genpd; 71 } 72 73 #ifdef CONFIG_PM 74 75 struct generic_pm_domain *dev_to_genpd(struct device *dev) 76 { 77 if (IS_ERR_OR_NULL(dev->pm_domain)) 78 return ERR_PTR(-EINVAL); 79 80 return pd_to_genpd(dev->pm_domain); 81 } 82 83 static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) 84 { 85 return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, 86 stop_latency_ns, "stop"); 87 } 88 89 static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) 90 { 91 return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, 92 start_latency_ns, "start"); 93 } 94 95 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) 96 { 97 bool ret = false; 98 99 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) 100 ret = !!atomic_dec_and_test(&genpd->sd_count); 101 102 return ret; 103 } 104 105 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) 106 { 107 atomic_inc(&genpd->sd_count); 108 smp_mb__after_atomic_inc(); 109 } 110 111 static void genpd_acquire_lock(struct generic_pm_domain *genpd) 112 { 113 DEFINE_WAIT(wait); 114 115 mutex_lock(&genpd->lock); 116 /* 117 * Wait for the domain to transition into either the active, 118 * or the power off state. 119 */ 120 for (;;) { 121 prepare_to_wait(&genpd->status_wait_queue, &wait, 122 TASK_UNINTERRUPTIBLE); 123 if (genpd->status == GPD_STATE_ACTIVE 124 || genpd->status == GPD_STATE_POWER_OFF) 125 break; 126 mutex_unlock(&genpd->lock); 127 128 schedule(); 129 130 mutex_lock(&genpd->lock); 131 } 132 finish_wait(&genpd->status_wait_queue, &wait); 133 } 134 135 static void genpd_release_lock(struct generic_pm_domain *genpd) 136 { 137 mutex_unlock(&genpd->lock); 138 } 139 140 static void genpd_set_active(struct generic_pm_domain *genpd) 141 { 142 if (genpd->resume_count == 0) 143 genpd->status = GPD_STATE_ACTIVE; 144 } 145 146 static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) 147 { 148 s64 usecs64; 149 150 if (!genpd->cpu_data) 151 return; 152 153 usecs64 = genpd->power_on_latency_ns; 154 do_div(usecs64, NSEC_PER_USEC); 155 usecs64 += genpd->cpu_data->saved_exit_latency; 156 genpd->cpu_data->idle_state->exit_latency = usecs64; 157 } 158 159 /** 160 * __pm_genpd_poweron - Restore power to a given PM domain and its masters. 161 * @genpd: PM domain to power up. 162 * 163 * Restore power to @genpd and all of its masters so that it is possible to 164 * resume a device belonging to it. 165 */ 166 static int __pm_genpd_poweron(struct generic_pm_domain *genpd) 167 __releases(&genpd->lock) __acquires(&genpd->lock) 168 { 169 struct gpd_link *link; 170 DEFINE_WAIT(wait); 171 int ret = 0; 172 173 /* If the domain's master is being waited for, we have to wait too. */ 174 for (;;) { 175 prepare_to_wait(&genpd->status_wait_queue, &wait, 176 TASK_UNINTERRUPTIBLE); 177 if (genpd->status != GPD_STATE_WAIT_MASTER) 178 break; 179 mutex_unlock(&genpd->lock); 180 181 schedule(); 182 183 mutex_lock(&genpd->lock); 184 } 185 finish_wait(&genpd->status_wait_queue, &wait); 186 187 if (genpd->status == GPD_STATE_ACTIVE 188 || (genpd->prepared_count > 0 && genpd->suspend_power_off)) 189 return 0; 190 191 if (genpd->status != GPD_STATE_POWER_OFF) { 192 genpd_set_active(genpd); 193 return 0; 194 } 195 196 if (genpd->cpu_data) { 197 cpuidle_pause_and_lock(); 198 genpd->cpu_data->idle_state->disabled = true; 199 cpuidle_resume_and_unlock(); 200 goto out; 201 } 202 203 /* 204 * The list is guaranteed not to change while the loop below is being 205 * executed, unless one of the masters' .power_on() callbacks fiddles 206 * with it. 207 */ 208 list_for_each_entry(link, &genpd->slave_links, slave_node) { 209 genpd_sd_counter_inc(link->master); 210 genpd->status = GPD_STATE_WAIT_MASTER; 211 212 mutex_unlock(&genpd->lock); 213 214 ret = pm_genpd_poweron(link->master); 215 216 mutex_lock(&genpd->lock); 217 218 /* 219 * The "wait for parent" status is guaranteed not to change 220 * while the master is powering on. 221 */ 222 genpd->status = GPD_STATE_POWER_OFF; 223 wake_up_all(&genpd->status_wait_queue); 224 if (ret) { 225 genpd_sd_counter_dec(link->master); 226 goto err; 227 } 228 } 229 230 if (genpd->power_on) { 231 ktime_t time_start = ktime_get(); 232 s64 elapsed_ns; 233 234 ret = genpd->power_on(genpd); 235 if (ret) 236 goto err; 237 238 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 239 if (elapsed_ns > genpd->power_on_latency_ns) { 240 genpd->power_on_latency_ns = elapsed_ns; 241 genpd->max_off_time_changed = true; 242 genpd_recalc_cpu_exit_latency(genpd); 243 if (genpd->name) 244 pr_warning("%s: Power-on latency exceeded, " 245 "new value %lld ns\n", genpd->name, 246 elapsed_ns); 247 } 248 } 249 250 out: 251 genpd_set_active(genpd); 252 253 return 0; 254 255 err: 256 list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) 257 genpd_sd_counter_dec(link->master); 258 259 return ret; 260 } 261 262 /** 263 * pm_genpd_poweron - Restore power to a given PM domain and its masters. 264 * @genpd: PM domain to power up. 265 */ 266 int pm_genpd_poweron(struct generic_pm_domain *genpd) 267 { 268 int ret; 269 270 mutex_lock(&genpd->lock); 271 ret = __pm_genpd_poweron(genpd); 272 mutex_unlock(&genpd->lock); 273 return ret; 274 } 275 276 /** 277 * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. 278 * @domain_name: Name of the PM domain to power up. 279 */ 280 int pm_genpd_name_poweron(const char *domain_name) 281 { 282 struct generic_pm_domain *genpd; 283 284 genpd = pm_genpd_lookup_name(domain_name); 285 return genpd ? pm_genpd_poweron(genpd) : -EINVAL; 286 } 287 288 #endif /* CONFIG_PM */ 289 290 #ifdef CONFIG_PM_RUNTIME 291 292 static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, 293 struct device *dev) 294 { 295 return GENPD_DEV_CALLBACK(genpd, int, start, dev); 296 } 297 298 static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) 299 { 300 return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, 301 save_state_latency_ns, "state save"); 302 } 303 304 static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) 305 { 306 return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, 307 restore_state_latency_ns, 308 "state restore"); 309 } 310 311 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, 312 unsigned long val, void *ptr) 313 { 314 struct generic_pm_domain_data *gpd_data; 315 struct device *dev; 316 317 gpd_data = container_of(nb, struct generic_pm_domain_data, nb); 318 319 mutex_lock(&gpd_data->lock); 320 dev = gpd_data->base.dev; 321 if (!dev) { 322 mutex_unlock(&gpd_data->lock); 323 return NOTIFY_DONE; 324 } 325 mutex_unlock(&gpd_data->lock); 326 327 for (;;) { 328 struct generic_pm_domain *genpd; 329 struct pm_domain_data *pdd; 330 331 spin_lock_irq(&dev->power.lock); 332 333 pdd = dev->power.subsys_data ? 334 dev->power.subsys_data->domain_data : NULL; 335 if (pdd && pdd->dev) { 336 to_gpd_data(pdd)->td.constraint_changed = true; 337 genpd = dev_to_genpd(dev); 338 } else { 339 genpd = ERR_PTR(-ENODATA); 340 } 341 342 spin_unlock_irq(&dev->power.lock); 343 344 if (!IS_ERR(genpd)) { 345 mutex_lock(&genpd->lock); 346 genpd->max_off_time_changed = true; 347 mutex_unlock(&genpd->lock); 348 } 349 350 dev = dev->parent; 351 if (!dev || dev->power.ignore_children) 352 break; 353 } 354 355 return NOTIFY_DONE; 356 } 357 358 /** 359 * __pm_genpd_save_device - Save the pre-suspend state of a device. 360 * @pdd: Domain data of the device to save the state of. 361 * @genpd: PM domain the device belongs to. 362 */ 363 static int __pm_genpd_save_device(struct pm_domain_data *pdd, 364 struct generic_pm_domain *genpd) 365 __releases(&genpd->lock) __acquires(&genpd->lock) 366 { 367 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); 368 struct device *dev = pdd->dev; 369 int ret = 0; 370 371 if (gpd_data->need_restore) 372 return 0; 373 374 mutex_unlock(&genpd->lock); 375 376 genpd_start_dev(genpd, dev); 377 ret = genpd_save_dev(genpd, dev); 378 genpd_stop_dev(genpd, dev); 379 380 mutex_lock(&genpd->lock); 381 382 if (!ret) 383 gpd_data->need_restore = true; 384 385 return ret; 386 } 387 388 /** 389 * __pm_genpd_restore_device - Restore the pre-suspend state of a device. 390 * @pdd: Domain data of the device to restore the state of. 391 * @genpd: PM domain the device belongs to. 392 */ 393 static void __pm_genpd_restore_device(struct pm_domain_data *pdd, 394 struct generic_pm_domain *genpd) 395 __releases(&genpd->lock) __acquires(&genpd->lock) 396 { 397 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); 398 struct device *dev = pdd->dev; 399 bool need_restore = gpd_data->need_restore; 400 401 gpd_data->need_restore = false; 402 mutex_unlock(&genpd->lock); 403 404 genpd_start_dev(genpd, dev); 405 if (need_restore) 406 genpd_restore_dev(genpd, dev); 407 408 mutex_lock(&genpd->lock); 409 } 410 411 /** 412 * genpd_abort_poweroff - Check if a PM domain power off should be aborted. 413 * @genpd: PM domain to check. 414 * 415 * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during 416 * a "power off" operation, which means that a "power on" has occured in the 417 * meantime, or if its resume_count field is different from zero, which means 418 * that one of its devices has been resumed in the meantime. 419 */ 420 static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) 421 { 422 return genpd->status == GPD_STATE_WAIT_MASTER 423 || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; 424 } 425 426 /** 427 * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). 428 * @genpd: PM domait to power off. 429 * 430 * Queue up the execution of pm_genpd_poweroff() unless it's already been done 431 * before. 432 */ 433 void genpd_queue_power_off_work(struct generic_pm_domain *genpd) 434 { 435 queue_work(pm_wq, &genpd->power_off_work); 436 } 437 438 /** 439 * pm_genpd_poweroff - Remove power from a given PM domain. 440 * @genpd: PM domain to power down. 441 * 442 * If all of the @genpd's devices have been suspended and all of its subdomains 443 * have been powered down, run the runtime suspend callbacks provided by all of 444 * the @genpd's devices' drivers and remove power from @genpd. 445 */ 446 static int pm_genpd_poweroff(struct generic_pm_domain *genpd) 447 __releases(&genpd->lock) __acquires(&genpd->lock) 448 { 449 struct pm_domain_data *pdd; 450 struct gpd_link *link; 451 unsigned int not_suspended; 452 int ret = 0; 453 454 start: 455 /* 456 * Do not try to power off the domain in the following situations: 457 * (1) The domain is already in the "power off" state. 458 * (2) The domain is waiting for its master to power up. 459 * (3) One of the domain's devices is being resumed right now. 460 * (4) System suspend is in progress. 461 */ 462 if (genpd->status == GPD_STATE_POWER_OFF 463 || genpd->status == GPD_STATE_WAIT_MASTER 464 || genpd->resume_count > 0 || genpd->prepared_count > 0) 465 return 0; 466 467 if (atomic_read(&genpd->sd_count) > 0) 468 return -EBUSY; 469 470 not_suspended = 0; 471 list_for_each_entry(pdd, &genpd->dev_list, list_node) { 472 enum pm_qos_flags_status stat; 473 474 stat = dev_pm_qos_flags(pdd->dev, 475 PM_QOS_FLAG_NO_POWER_OFF 476 | PM_QOS_FLAG_REMOTE_WAKEUP); 477 if (stat > PM_QOS_FLAGS_NONE) 478 return -EBUSY; 479 480 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) 481 || pdd->dev->power.irq_safe)) 482 not_suspended++; 483 } 484 485 if (not_suspended > genpd->in_progress) 486 return -EBUSY; 487 488 if (genpd->poweroff_task) { 489 /* 490 * Another instance of pm_genpd_poweroff() is executing 491 * callbacks, so tell it to start over and return. 492 */ 493 genpd->status = GPD_STATE_REPEAT; 494 return 0; 495 } 496 497 if (genpd->gov && genpd->gov->power_down_ok) { 498 if (!genpd->gov->power_down_ok(&genpd->domain)) 499 return -EAGAIN; 500 } 501 502 genpd->status = GPD_STATE_BUSY; 503 genpd->poweroff_task = current; 504 505 list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { 506 ret = atomic_read(&genpd->sd_count) == 0 ? 507 __pm_genpd_save_device(pdd, genpd) : -EBUSY; 508 509 if (genpd_abort_poweroff(genpd)) 510 goto out; 511 512 if (ret) { 513 genpd_set_active(genpd); 514 goto out; 515 } 516 517 if (genpd->status == GPD_STATE_REPEAT) { 518 genpd->poweroff_task = NULL; 519 goto start; 520 } 521 } 522 523 if (genpd->cpu_data) { 524 /* 525 * If cpu_data is set, cpuidle should turn the domain off when 526 * the CPU in it is idle. In that case we don't decrement the 527 * subdomain counts of the master domains, so that power is not 528 * removed from the current domain prematurely as a result of 529 * cutting off the masters' power. 530 */ 531 genpd->status = GPD_STATE_POWER_OFF; 532 cpuidle_pause_and_lock(); 533 genpd->cpu_data->idle_state->disabled = false; 534 cpuidle_resume_and_unlock(); 535 goto out; 536 } 537 538 if (genpd->power_off) { 539 ktime_t time_start; 540 s64 elapsed_ns; 541 542 if (atomic_read(&genpd->sd_count) > 0) { 543 ret = -EBUSY; 544 goto out; 545 } 546 547 time_start = ktime_get(); 548 549 /* 550 * If sd_count > 0 at this point, one of the subdomains hasn't 551 * managed to call pm_genpd_poweron() for the master yet after 552 * incrementing it. In that case pm_genpd_poweron() will wait 553 * for us to drop the lock, so we can call .power_off() and let 554 * the pm_genpd_poweron() restore power for us (this shouldn't 555 * happen very often). 556 */ 557 ret = genpd->power_off(genpd); 558 if (ret == -EBUSY) { 559 genpd_set_active(genpd); 560 goto out; 561 } 562 563 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 564 if (elapsed_ns > genpd->power_off_latency_ns) { 565 genpd->power_off_latency_ns = elapsed_ns; 566 genpd->max_off_time_changed = true; 567 if (genpd->name) 568 pr_warning("%s: Power-off latency exceeded, " 569 "new value %lld ns\n", genpd->name, 570 elapsed_ns); 571 } 572 } 573 574 genpd->status = GPD_STATE_POWER_OFF; 575 576 list_for_each_entry(link, &genpd->slave_links, slave_node) { 577 genpd_sd_counter_dec(link->master); 578 genpd_queue_power_off_work(link->master); 579 } 580 581 out: 582 genpd->poweroff_task = NULL; 583 wake_up_all(&genpd->status_wait_queue); 584 return ret; 585 } 586 587 /** 588 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. 589 * @work: Work structure used for scheduling the execution of this function. 590 */ 591 static void genpd_power_off_work_fn(struct work_struct *work) 592 { 593 struct generic_pm_domain *genpd; 594 595 genpd = container_of(work, struct generic_pm_domain, power_off_work); 596 597 genpd_acquire_lock(genpd); 598 pm_genpd_poweroff(genpd); 599 genpd_release_lock(genpd); 600 } 601 602 /** 603 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. 604 * @dev: Device to suspend. 605 * 606 * Carry out a runtime suspend of a device under the assumption that its 607 * pm_domain field points to the domain member of an object of type 608 * struct generic_pm_domain representing a PM domain consisting of I/O devices. 609 */ 610 static int pm_genpd_runtime_suspend(struct device *dev) 611 { 612 struct generic_pm_domain *genpd; 613 bool (*stop_ok)(struct device *__dev); 614 int ret; 615 616 dev_dbg(dev, "%s()\n", __func__); 617 618 genpd = dev_to_genpd(dev); 619 if (IS_ERR(genpd)) 620 return -EINVAL; 621 622 might_sleep_if(!genpd->dev_irq_safe); 623 624 stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; 625 if (stop_ok && !stop_ok(dev)) 626 return -EBUSY; 627 628 ret = genpd_stop_dev(genpd, dev); 629 if (ret) 630 return ret; 631 632 /* 633 * If power.irq_safe is set, this routine will be run with interrupts 634 * off, so it can't use mutexes. 635 */ 636 if (dev->power.irq_safe) 637 return 0; 638 639 mutex_lock(&genpd->lock); 640 genpd->in_progress++; 641 pm_genpd_poweroff(genpd); 642 genpd->in_progress--; 643 mutex_unlock(&genpd->lock); 644 645 return 0; 646 } 647 648 /** 649 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. 650 * @dev: Device to resume. 651 * 652 * Carry out a runtime resume of a device under the assumption that its 653 * pm_domain field points to the domain member of an object of type 654 * struct generic_pm_domain representing a PM domain consisting of I/O devices. 655 */ 656 static int pm_genpd_runtime_resume(struct device *dev) 657 { 658 struct generic_pm_domain *genpd; 659 DEFINE_WAIT(wait); 660 int ret; 661 662 dev_dbg(dev, "%s()\n", __func__); 663 664 genpd = dev_to_genpd(dev); 665 if (IS_ERR(genpd)) 666 return -EINVAL; 667 668 might_sleep_if(!genpd->dev_irq_safe); 669 670 /* If power.irq_safe, the PM domain is never powered off. */ 671 if (dev->power.irq_safe) 672 return genpd_start_dev_no_timing(genpd, dev); 673 674 mutex_lock(&genpd->lock); 675 ret = __pm_genpd_poweron(genpd); 676 if (ret) { 677 mutex_unlock(&genpd->lock); 678 return ret; 679 } 680 genpd->status = GPD_STATE_BUSY; 681 genpd->resume_count++; 682 for (;;) { 683 prepare_to_wait(&genpd->status_wait_queue, &wait, 684 TASK_UNINTERRUPTIBLE); 685 /* 686 * If current is the powering off task, we have been called 687 * reentrantly from one of the device callbacks, so we should 688 * not wait. 689 */ 690 if (!genpd->poweroff_task || genpd->poweroff_task == current) 691 break; 692 mutex_unlock(&genpd->lock); 693 694 schedule(); 695 696 mutex_lock(&genpd->lock); 697 } 698 finish_wait(&genpd->status_wait_queue, &wait); 699 __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); 700 genpd->resume_count--; 701 genpd_set_active(genpd); 702 wake_up_all(&genpd->status_wait_queue); 703 mutex_unlock(&genpd->lock); 704 705 return 0; 706 } 707 708 static bool pd_ignore_unused; 709 static int __init pd_ignore_unused_setup(char *__unused) 710 { 711 pd_ignore_unused = true; 712 return 1; 713 } 714 __setup("pd_ignore_unused", pd_ignore_unused_setup); 715 716 /** 717 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. 718 */ 719 void pm_genpd_poweroff_unused(void) 720 { 721 struct generic_pm_domain *genpd; 722 723 if (pd_ignore_unused) { 724 pr_warn("genpd: Not disabling unused power domains\n"); 725 return; 726 } 727 728 mutex_lock(&gpd_list_lock); 729 730 list_for_each_entry(genpd, &gpd_list, gpd_list_node) 731 genpd_queue_power_off_work(genpd); 732 733 mutex_unlock(&gpd_list_lock); 734 } 735 736 #else 737 738 static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, 739 unsigned long val, void *ptr) 740 { 741 return NOTIFY_DONE; 742 } 743 744 static inline void genpd_power_off_work_fn(struct work_struct *work) {} 745 746 #define pm_genpd_runtime_suspend NULL 747 #define pm_genpd_runtime_resume NULL 748 749 #endif /* CONFIG_PM_RUNTIME */ 750 751 #ifdef CONFIG_PM_SLEEP 752 753 /** 754 * pm_genpd_present - Check if the given PM domain has been initialized. 755 * @genpd: PM domain to check. 756 */ 757 static bool pm_genpd_present(struct generic_pm_domain *genpd) 758 { 759 struct generic_pm_domain *gpd; 760 761 if (IS_ERR_OR_NULL(genpd)) 762 return false; 763 764 list_for_each_entry(gpd, &gpd_list, gpd_list_node) 765 if (gpd == genpd) 766 return true; 767 768 return false; 769 } 770 771 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, 772 struct device *dev) 773 { 774 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); 775 } 776 777 static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) 778 { 779 return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); 780 } 781 782 static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) 783 { 784 return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); 785 } 786 787 static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) 788 { 789 return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); 790 } 791 792 static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) 793 { 794 return GENPD_DEV_CALLBACK(genpd, int, resume, dev); 795 } 796 797 static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) 798 { 799 return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); 800 } 801 802 static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) 803 { 804 return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); 805 } 806 807 static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) 808 { 809 return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); 810 } 811 812 static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) 813 { 814 return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); 815 } 816 817 /** 818 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. 819 * @genpd: PM domain to power off, if possible. 820 * 821 * Check if the given PM domain can be powered off (during system suspend or 822 * hibernation) and do that if so. Also, in that case propagate to its masters. 823 * 824 * This function is only called in "noirq" and "syscore" stages of system power 825 * transitions, so it need not acquire locks (all of the "noirq" callbacks are 826 * executed sequentially, so it is guaranteed that it will never run twice in 827 * parallel). 828 */ 829 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) 830 { 831 struct gpd_link *link; 832 833 if (genpd->status == GPD_STATE_POWER_OFF) 834 return; 835 836 if (genpd->suspended_count != genpd->device_count 837 || atomic_read(&genpd->sd_count) > 0) 838 return; 839 840 if (genpd->power_off) 841 genpd->power_off(genpd); 842 843 genpd->status = GPD_STATE_POWER_OFF; 844 845 list_for_each_entry(link, &genpd->slave_links, slave_node) { 846 genpd_sd_counter_dec(link->master); 847 pm_genpd_sync_poweroff(link->master); 848 } 849 } 850 851 /** 852 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. 853 * @genpd: PM domain to power on. 854 * 855 * This function is only called in "noirq" and "syscore" stages of system power 856 * transitions, so it need not acquire locks (all of the "noirq" callbacks are 857 * executed sequentially, so it is guaranteed that it will never run twice in 858 * parallel). 859 */ 860 static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) 861 { 862 struct gpd_link *link; 863 864 if (genpd->status != GPD_STATE_POWER_OFF) 865 return; 866 867 list_for_each_entry(link, &genpd->slave_links, slave_node) { 868 pm_genpd_sync_poweron(link->master); 869 genpd_sd_counter_inc(link->master); 870 } 871 872 if (genpd->power_on) 873 genpd->power_on(genpd); 874 875 genpd->status = GPD_STATE_ACTIVE; 876 } 877 878 /** 879 * resume_needed - Check whether to resume a device before system suspend. 880 * @dev: Device to check. 881 * @genpd: PM domain the device belongs to. 882 * 883 * There are two cases in which a device that can wake up the system from sleep 884 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled 885 * to wake up the system and it has to remain active for this purpose while the 886 * system is in the sleep state and (2) if the device is not enabled to wake up 887 * the system from sleep states and it generally doesn't generate wakeup signals 888 * by itself (those signals are generated on its behalf by other parts of the 889 * system). In the latter case it may be necessary to reconfigure the device's 890 * wakeup settings during system suspend, because it may have been set up to 891 * signal remote wakeup from the system's working state as needed by runtime PM. 892 * Return 'true' in either of the above cases. 893 */ 894 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) 895 { 896 bool active_wakeup; 897 898 if (!device_can_wakeup(dev)) 899 return false; 900 901 active_wakeup = genpd_dev_active_wakeup(genpd, dev); 902 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; 903 } 904 905 /** 906 * pm_genpd_prepare - Start power transition of a device in a PM domain. 907 * @dev: Device to start the transition of. 908 * 909 * Start a power transition of a device (during a system-wide power transition) 910 * under the assumption that its pm_domain field points to the domain member of 911 * an object of type struct generic_pm_domain representing a PM domain 912 * consisting of I/O devices. 913 */ 914 static int pm_genpd_prepare(struct device *dev) 915 { 916 struct generic_pm_domain *genpd; 917 int ret; 918 919 dev_dbg(dev, "%s()\n", __func__); 920 921 genpd = dev_to_genpd(dev); 922 if (IS_ERR(genpd)) 923 return -EINVAL; 924 925 /* 926 * If a wakeup request is pending for the device, it should be woken up 927 * at this point and a system wakeup event should be reported if it's 928 * set up to wake up the system from sleep states. 929 */ 930 pm_runtime_get_noresume(dev); 931 if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) 932 pm_wakeup_event(dev, 0); 933 934 if (pm_wakeup_pending()) { 935 pm_runtime_put(dev); 936 return -EBUSY; 937 } 938 939 if (resume_needed(dev, genpd)) 940 pm_runtime_resume(dev); 941 942 genpd_acquire_lock(genpd); 943 944 if (genpd->prepared_count++ == 0) { 945 genpd->suspended_count = 0; 946 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; 947 } 948 949 genpd_release_lock(genpd); 950 951 if (genpd->suspend_power_off) { 952 pm_runtime_put_noidle(dev); 953 return 0; 954 } 955 956 /* 957 * The PM domain must be in the GPD_STATE_ACTIVE state at this point, 958 * so pm_genpd_poweron() will return immediately, but if the device 959 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need 960 * to make it operational. 961 */ 962 pm_runtime_resume(dev); 963 __pm_runtime_disable(dev, false); 964 965 ret = pm_generic_prepare(dev); 966 if (ret) { 967 mutex_lock(&genpd->lock); 968 969 if (--genpd->prepared_count == 0) 970 genpd->suspend_power_off = false; 971 972 mutex_unlock(&genpd->lock); 973 pm_runtime_enable(dev); 974 } 975 976 pm_runtime_put(dev); 977 return ret; 978 } 979 980 /** 981 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. 982 * @dev: Device to suspend. 983 * 984 * Suspend a device under the assumption that its pm_domain field points to the 985 * domain member of an object of type struct generic_pm_domain representing 986 * a PM domain consisting of I/O devices. 987 */ 988 static int pm_genpd_suspend(struct device *dev) 989 { 990 struct generic_pm_domain *genpd; 991 992 dev_dbg(dev, "%s()\n", __func__); 993 994 genpd = dev_to_genpd(dev); 995 if (IS_ERR(genpd)) 996 return -EINVAL; 997 998 return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); 999 } 1000 1001 /** 1002 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. 1003 * @dev: Device to suspend. 1004 * 1005 * Carry out a late suspend of a device under the assumption that its 1006 * pm_domain field points to the domain member of an object of type 1007 * struct generic_pm_domain representing a PM domain consisting of I/O devices. 1008 */ 1009 static int pm_genpd_suspend_late(struct device *dev) 1010 { 1011 struct generic_pm_domain *genpd; 1012 1013 dev_dbg(dev, "%s()\n", __func__); 1014 1015 genpd = dev_to_genpd(dev); 1016 if (IS_ERR(genpd)) 1017 return -EINVAL; 1018 1019 return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); 1020 } 1021 1022 /** 1023 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. 1024 * @dev: Device to suspend. 1025 * 1026 * Stop the device and remove power from the domain if all devices in it have 1027 * been stopped. 1028 */ 1029 static int pm_genpd_suspend_noirq(struct device *dev) 1030 { 1031 struct generic_pm_domain *genpd; 1032 1033 dev_dbg(dev, "%s()\n", __func__); 1034 1035 genpd = dev_to_genpd(dev); 1036 if (IS_ERR(genpd)) 1037 return -EINVAL; 1038 1039 if (genpd->suspend_power_off 1040 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) 1041 return 0; 1042 1043 genpd_stop_dev(genpd, dev); 1044 1045 /* 1046 * Since all of the "noirq" callbacks are executed sequentially, it is 1047 * guaranteed that this function will never run twice in parallel for 1048 * the same PM domain, so it is not necessary to use locking here. 1049 */ 1050 genpd->suspended_count++; 1051 pm_genpd_sync_poweroff(genpd); 1052 1053 return 0; 1054 } 1055 1056 /** 1057 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. 1058 * @dev: Device to resume. 1059 * 1060 * Restore power to the device's PM domain, if necessary, and start the device. 1061 */ 1062 static int pm_genpd_resume_noirq(struct device *dev) 1063 { 1064 struct generic_pm_domain *genpd; 1065 1066 dev_dbg(dev, "%s()\n", __func__); 1067 1068 genpd = dev_to_genpd(dev); 1069 if (IS_ERR(genpd)) 1070 return -EINVAL; 1071 1072 if (genpd->suspend_power_off 1073 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) 1074 return 0; 1075 1076 /* 1077 * Since all of the "noirq" callbacks are executed sequentially, it is 1078 * guaranteed that this function will never run twice in parallel for 1079 * the same PM domain, so it is not necessary to use locking here. 1080 */ 1081 pm_genpd_sync_poweron(genpd); 1082 genpd->suspended_count--; 1083 1084 return genpd_start_dev(genpd, dev); 1085 } 1086 1087 /** 1088 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. 1089 * @dev: Device to resume. 1090 * 1091 * Carry out an early resume of a device under the assumption that its 1092 * pm_domain field points to the domain member of an object of type 1093 * struct generic_pm_domain representing a power domain consisting of I/O 1094 * devices. 1095 */ 1096 static int pm_genpd_resume_early(struct device *dev) 1097 { 1098 struct generic_pm_domain *genpd; 1099 1100 dev_dbg(dev, "%s()\n", __func__); 1101 1102 genpd = dev_to_genpd(dev); 1103 if (IS_ERR(genpd)) 1104 return -EINVAL; 1105 1106 return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); 1107 } 1108 1109 /** 1110 * pm_genpd_resume - Resume of device in an I/O PM domain. 1111 * @dev: Device to resume. 1112 * 1113 * Resume a device under the assumption that its pm_domain field points to the 1114 * domain member of an object of type struct generic_pm_domain representing 1115 * a power domain consisting of I/O devices. 1116 */ 1117 static int pm_genpd_resume(struct device *dev) 1118 { 1119 struct generic_pm_domain *genpd; 1120 1121 dev_dbg(dev, "%s()\n", __func__); 1122 1123 genpd = dev_to_genpd(dev); 1124 if (IS_ERR(genpd)) 1125 return -EINVAL; 1126 1127 return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); 1128 } 1129 1130 /** 1131 * pm_genpd_freeze - Freezing a device in an I/O PM domain. 1132 * @dev: Device to freeze. 1133 * 1134 * Freeze a device under the assumption that its pm_domain field points to the 1135 * domain member of an object of type struct generic_pm_domain representing 1136 * a power domain consisting of I/O devices. 1137 */ 1138 static int pm_genpd_freeze(struct device *dev) 1139 { 1140 struct generic_pm_domain *genpd; 1141 1142 dev_dbg(dev, "%s()\n", __func__); 1143 1144 genpd = dev_to_genpd(dev); 1145 if (IS_ERR(genpd)) 1146 return -EINVAL; 1147 1148 return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); 1149 } 1150 1151 /** 1152 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. 1153 * @dev: Device to freeze. 1154 * 1155 * Carry out a late freeze of a device under the assumption that its 1156 * pm_domain field points to the domain member of an object of type 1157 * struct generic_pm_domain representing a power domain consisting of I/O 1158 * devices. 1159 */ 1160 static int pm_genpd_freeze_late(struct device *dev) 1161 { 1162 struct generic_pm_domain *genpd; 1163 1164 dev_dbg(dev, "%s()\n", __func__); 1165 1166 genpd = dev_to_genpd(dev); 1167 if (IS_ERR(genpd)) 1168 return -EINVAL; 1169 1170 return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); 1171 } 1172 1173 /** 1174 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. 1175 * @dev: Device to freeze. 1176 * 1177 * Carry out a late freeze of a device under the assumption that its 1178 * pm_domain field points to the domain member of an object of type 1179 * struct generic_pm_domain representing a power domain consisting of I/O 1180 * devices. 1181 */ 1182 static int pm_genpd_freeze_noirq(struct device *dev) 1183 { 1184 struct generic_pm_domain *genpd; 1185 1186 dev_dbg(dev, "%s()\n", __func__); 1187 1188 genpd = dev_to_genpd(dev); 1189 if (IS_ERR(genpd)) 1190 return -EINVAL; 1191 1192 return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); 1193 } 1194 1195 /** 1196 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. 1197 * @dev: Device to thaw. 1198 * 1199 * Start the device, unless power has been removed from the domain already 1200 * before the system transition. 1201 */ 1202 static int pm_genpd_thaw_noirq(struct device *dev) 1203 { 1204 struct generic_pm_domain *genpd; 1205 1206 dev_dbg(dev, "%s()\n", __func__); 1207 1208 genpd = dev_to_genpd(dev); 1209 if (IS_ERR(genpd)) 1210 return -EINVAL; 1211 1212 return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); 1213 } 1214 1215 /** 1216 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. 1217 * @dev: Device to thaw. 1218 * 1219 * Carry out an early thaw of a device under the assumption that its 1220 * pm_domain field points to the domain member of an object of type 1221 * struct generic_pm_domain representing a power domain consisting of I/O 1222 * devices. 1223 */ 1224 static int pm_genpd_thaw_early(struct device *dev) 1225 { 1226 struct generic_pm_domain *genpd; 1227 1228 dev_dbg(dev, "%s()\n", __func__); 1229 1230 genpd = dev_to_genpd(dev); 1231 if (IS_ERR(genpd)) 1232 return -EINVAL; 1233 1234 return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); 1235 } 1236 1237 /** 1238 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. 1239 * @dev: Device to thaw. 1240 * 1241 * Thaw a device under the assumption that its pm_domain field points to the 1242 * domain member of an object of type struct generic_pm_domain representing 1243 * a power domain consisting of I/O devices. 1244 */ 1245 static int pm_genpd_thaw(struct device *dev) 1246 { 1247 struct generic_pm_domain *genpd; 1248 1249 dev_dbg(dev, "%s()\n", __func__); 1250 1251 genpd = dev_to_genpd(dev); 1252 if (IS_ERR(genpd)) 1253 return -EINVAL; 1254 1255 return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); 1256 } 1257 1258 /** 1259 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. 1260 * @dev: Device to resume. 1261 * 1262 * Make sure the domain will be in the same power state as before the 1263 * hibernation the system is resuming from and start the device if necessary. 1264 */ 1265 static int pm_genpd_restore_noirq(struct device *dev) 1266 { 1267 struct generic_pm_domain *genpd; 1268 1269 dev_dbg(dev, "%s()\n", __func__); 1270 1271 genpd = dev_to_genpd(dev); 1272 if (IS_ERR(genpd)) 1273 return -EINVAL; 1274 1275 /* 1276 * Since all of the "noirq" callbacks are executed sequentially, it is 1277 * guaranteed that this function will never run twice in parallel for 1278 * the same PM domain, so it is not necessary to use locking here. 1279 * 1280 * At this point suspended_count == 0 means we are being run for the 1281 * first time for the given domain in the present cycle. 1282 */ 1283 if (genpd->suspended_count++ == 0) { 1284 /* 1285 * The boot kernel might put the domain into arbitrary state, 1286 * so make it appear as powered off to pm_genpd_sync_poweron(), 1287 * so that it tries to power it on in case it was really off. 1288 */ 1289 genpd->status = GPD_STATE_POWER_OFF; 1290 if (genpd->suspend_power_off) { 1291 /* 1292 * If the domain was off before the hibernation, make 1293 * sure it will be off going forward. 1294 */ 1295 if (genpd->power_off) 1296 genpd->power_off(genpd); 1297 1298 return 0; 1299 } 1300 } 1301 1302 if (genpd->suspend_power_off) 1303 return 0; 1304 1305 pm_genpd_sync_poweron(genpd); 1306 1307 return genpd_start_dev(genpd, dev); 1308 } 1309 1310 /** 1311 * pm_genpd_complete - Complete power transition of a device in a power domain. 1312 * @dev: Device to complete the transition of. 1313 * 1314 * Complete a power transition of a device (during a system-wide power 1315 * transition) under the assumption that its pm_domain field points to the 1316 * domain member of an object of type struct generic_pm_domain representing 1317 * a power domain consisting of I/O devices. 1318 */ 1319 static void pm_genpd_complete(struct device *dev) 1320 { 1321 struct generic_pm_domain *genpd; 1322 bool run_complete; 1323 1324 dev_dbg(dev, "%s()\n", __func__); 1325 1326 genpd = dev_to_genpd(dev); 1327 if (IS_ERR(genpd)) 1328 return; 1329 1330 mutex_lock(&genpd->lock); 1331 1332 run_complete = !genpd->suspend_power_off; 1333 if (--genpd->prepared_count == 0) 1334 genpd->suspend_power_off = false; 1335 1336 mutex_unlock(&genpd->lock); 1337 1338 if (run_complete) { 1339 pm_generic_complete(dev); 1340 pm_runtime_set_active(dev); 1341 pm_runtime_enable(dev); 1342 pm_request_idle(dev); 1343 } 1344 } 1345 1346 /** 1347 * pm_genpd_syscore_switch - Switch power during system core suspend or resume. 1348 * @dev: Device that normally is marked as "always on" to switch power for. 1349 * 1350 * This routine may only be called during the system core (syscore) suspend or 1351 * resume phase for devices whose "always on" flags are set. 1352 */ 1353 void pm_genpd_syscore_switch(struct device *dev, bool suspend) 1354 { 1355 struct generic_pm_domain *genpd; 1356 1357 genpd = dev_to_genpd(dev); 1358 if (!pm_genpd_present(genpd)) 1359 return; 1360 1361 if (suspend) { 1362 genpd->suspended_count++; 1363 pm_genpd_sync_poweroff(genpd); 1364 } else { 1365 pm_genpd_sync_poweron(genpd); 1366 genpd->suspended_count--; 1367 } 1368 } 1369 EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch); 1370 1371 #else 1372 1373 #define pm_genpd_prepare NULL 1374 #define pm_genpd_suspend NULL 1375 #define pm_genpd_suspend_late NULL 1376 #define pm_genpd_suspend_noirq NULL 1377 #define pm_genpd_resume_early NULL 1378 #define pm_genpd_resume_noirq NULL 1379 #define pm_genpd_resume NULL 1380 #define pm_genpd_freeze NULL 1381 #define pm_genpd_freeze_late NULL 1382 #define pm_genpd_freeze_noirq NULL 1383 #define pm_genpd_thaw_early NULL 1384 #define pm_genpd_thaw_noirq NULL 1385 #define pm_genpd_thaw NULL 1386 #define pm_genpd_restore_noirq NULL 1387 #define pm_genpd_complete NULL 1388 1389 #endif /* CONFIG_PM_SLEEP */ 1390 1391 static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) 1392 { 1393 struct generic_pm_domain_data *gpd_data; 1394 1395 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); 1396 if (!gpd_data) 1397 return NULL; 1398 1399 mutex_init(&gpd_data->lock); 1400 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; 1401 dev_pm_qos_add_notifier(dev, &gpd_data->nb); 1402 return gpd_data; 1403 } 1404 1405 static void __pm_genpd_free_dev_data(struct device *dev, 1406 struct generic_pm_domain_data *gpd_data) 1407 { 1408 dev_pm_qos_remove_notifier(dev, &gpd_data->nb); 1409 kfree(gpd_data); 1410 } 1411 1412 /** 1413 * __pm_genpd_add_device - Add a device to an I/O PM domain. 1414 * @genpd: PM domain to add the device to. 1415 * @dev: Device to be added. 1416 * @td: Set of PM QoS timing parameters to attach to the device. 1417 */ 1418 int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, 1419 struct gpd_timing_data *td) 1420 { 1421 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; 1422 struct pm_domain_data *pdd; 1423 int ret = 0; 1424 1425 dev_dbg(dev, "%s()\n", __func__); 1426 1427 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) 1428 return -EINVAL; 1429 1430 gpd_data_new = __pm_genpd_alloc_dev_data(dev); 1431 if (!gpd_data_new) 1432 return -ENOMEM; 1433 1434 genpd_acquire_lock(genpd); 1435 1436 if (genpd->prepared_count > 0) { 1437 ret = -EAGAIN; 1438 goto out; 1439 } 1440 1441 list_for_each_entry(pdd, &genpd->dev_list, list_node) 1442 if (pdd->dev == dev) { 1443 ret = -EINVAL; 1444 goto out; 1445 } 1446 1447 ret = dev_pm_get_subsys_data(dev); 1448 if (ret) 1449 goto out; 1450 1451 genpd->device_count++; 1452 genpd->max_off_time_changed = true; 1453 1454 spin_lock_irq(&dev->power.lock); 1455 1456 dev->pm_domain = &genpd->domain; 1457 if (dev->power.subsys_data->domain_data) { 1458 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 1459 } else { 1460 gpd_data = gpd_data_new; 1461 dev->power.subsys_data->domain_data = &gpd_data->base; 1462 } 1463 gpd_data->refcount++; 1464 if (td) 1465 gpd_data->td = *td; 1466 1467 spin_unlock_irq(&dev->power.lock); 1468 1469 mutex_lock(&gpd_data->lock); 1470 gpd_data->base.dev = dev; 1471 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); 1472 gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; 1473 gpd_data->td.constraint_changed = true; 1474 gpd_data->td.effective_constraint_ns = -1; 1475 mutex_unlock(&gpd_data->lock); 1476 1477 out: 1478 genpd_release_lock(genpd); 1479 1480 if (gpd_data != gpd_data_new) 1481 __pm_genpd_free_dev_data(dev, gpd_data_new); 1482 1483 return ret; 1484 } 1485 1486 /** 1487 * __pm_genpd_of_add_device - Add a device to an I/O PM domain. 1488 * @genpd_node: Device tree node pointer representing a PM domain to which the 1489 * the device is added to. 1490 * @dev: Device to be added. 1491 * @td: Set of PM QoS timing parameters to attach to the device. 1492 */ 1493 int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, 1494 struct gpd_timing_data *td) 1495 { 1496 struct generic_pm_domain *genpd = NULL, *gpd; 1497 1498 dev_dbg(dev, "%s()\n", __func__); 1499 1500 if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) 1501 return -EINVAL; 1502 1503 mutex_lock(&gpd_list_lock); 1504 list_for_each_entry(gpd, &gpd_list, gpd_list_node) { 1505 if (gpd->of_node == genpd_node) { 1506 genpd = gpd; 1507 break; 1508 } 1509 } 1510 mutex_unlock(&gpd_list_lock); 1511 1512 if (!genpd) 1513 return -EINVAL; 1514 1515 return __pm_genpd_add_device(genpd, dev, td); 1516 } 1517 1518 1519 /** 1520 * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. 1521 * @domain_name: Name of the PM domain to add the device to. 1522 * @dev: Device to be added. 1523 * @td: Set of PM QoS timing parameters to attach to the device. 1524 */ 1525 int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, 1526 struct gpd_timing_data *td) 1527 { 1528 return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); 1529 } 1530 1531 /** 1532 * pm_genpd_remove_device - Remove a device from an I/O PM domain. 1533 * @genpd: PM domain to remove the device from. 1534 * @dev: Device to be removed. 1535 */ 1536 int pm_genpd_remove_device(struct generic_pm_domain *genpd, 1537 struct device *dev) 1538 { 1539 struct generic_pm_domain_data *gpd_data; 1540 struct pm_domain_data *pdd; 1541 bool remove = false; 1542 int ret = 0; 1543 1544 dev_dbg(dev, "%s()\n", __func__); 1545 1546 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) 1547 || IS_ERR_OR_NULL(dev->pm_domain) 1548 || pd_to_genpd(dev->pm_domain) != genpd) 1549 return -EINVAL; 1550 1551 genpd_acquire_lock(genpd); 1552 1553 if (genpd->prepared_count > 0) { 1554 ret = -EAGAIN; 1555 goto out; 1556 } 1557 1558 genpd->device_count--; 1559 genpd->max_off_time_changed = true; 1560 1561 spin_lock_irq(&dev->power.lock); 1562 1563 dev->pm_domain = NULL; 1564 pdd = dev->power.subsys_data->domain_data; 1565 list_del_init(&pdd->list_node); 1566 gpd_data = to_gpd_data(pdd); 1567 if (--gpd_data->refcount == 0) { 1568 dev->power.subsys_data->domain_data = NULL; 1569 remove = true; 1570 } 1571 1572 spin_unlock_irq(&dev->power.lock); 1573 1574 mutex_lock(&gpd_data->lock); 1575 pdd->dev = NULL; 1576 mutex_unlock(&gpd_data->lock); 1577 1578 genpd_release_lock(genpd); 1579 1580 dev_pm_put_subsys_data(dev); 1581 if (remove) 1582 __pm_genpd_free_dev_data(dev, gpd_data); 1583 1584 return 0; 1585 1586 out: 1587 genpd_release_lock(genpd); 1588 1589 return ret; 1590 } 1591 1592 /** 1593 * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. 1594 * @dev: Device to set/unset the flag for. 1595 * @val: The new value of the device's "need restore" flag. 1596 */ 1597 void pm_genpd_dev_need_restore(struct device *dev, bool val) 1598 { 1599 struct pm_subsys_data *psd; 1600 unsigned long flags; 1601 1602 spin_lock_irqsave(&dev->power.lock, flags); 1603 1604 psd = dev_to_psd(dev); 1605 if (psd && psd->domain_data) 1606 to_gpd_data(psd->domain_data)->need_restore = val; 1607 1608 spin_unlock_irqrestore(&dev->power.lock, flags); 1609 } 1610 EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); 1611 1612 /** 1613 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. 1614 * @genpd: Master PM domain to add the subdomain to. 1615 * @subdomain: Subdomain to be added. 1616 */ 1617 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 1618 struct generic_pm_domain *subdomain) 1619 { 1620 struct gpd_link *link; 1621 int ret = 0; 1622 1623 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) 1624 || genpd == subdomain) 1625 return -EINVAL; 1626 1627 start: 1628 genpd_acquire_lock(genpd); 1629 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); 1630 1631 if (subdomain->status != GPD_STATE_POWER_OFF 1632 && subdomain->status != GPD_STATE_ACTIVE) { 1633 mutex_unlock(&subdomain->lock); 1634 genpd_release_lock(genpd); 1635 goto start; 1636 } 1637 1638 if (genpd->status == GPD_STATE_POWER_OFF 1639 && subdomain->status != GPD_STATE_POWER_OFF) { 1640 ret = -EINVAL; 1641 goto out; 1642 } 1643 1644 list_for_each_entry(link, &genpd->master_links, master_node) { 1645 if (link->slave == subdomain && link->master == genpd) { 1646 ret = -EINVAL; 1647 goto out; 1648 } 1649 } 1650 1651 link = kzalloc(sizeof(*link), GFP_KERNEL); 1652 if (!link) { 1653 ret = -ENOMEM; 1654 goto out; 1655 } 1656 link->master = genpd; 1657 list_add_tail(&link->master_node, &genpd->master_links); 1658 link->slave = subdomain; 1659 list_add_tail(&link->slave_node, &subdomain->slave_links); 1660 if (subdomain->status != GPD_STATE_POWER_OFF) 1661 genpd_sd_counter_inc(genpd); 1662 1663 out: 1664 mutex_unlock(&subdomain->lock); 1665 genpd_release_lock(genpd); 1666 1667 return ret; 1668 } 1669 1670 /** 1671 * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. 1672 * @master_name: Name of the master PM domain to add the subdomain to. 1673 * @subdomain_name: Name of the subdomain to be added. 1674 */ 1675 int pm_genpd_add_subdomain_names(const char *master_name, 1676 const char *subdomain_name) 1677 { 1678 struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; 1679 1680 if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) 1681 return -EINVAL; 1682 1683 mutex_lock(&gpd_list_lock); 1684 list_for_each_entry(gpd, &gpd_list, gpd_list_node) { 1685 if (!master && !strcmp(gpd->name, master_name)) 1686 master = gpd; 1687 1688 if (!subdomain && !strcmp(gpd->name, subdomain_name)) 1689 subdomain = gpd; 1690 1691 if (master && subdomain) 1692 break; 1693 } 1694 mutex_unlock(&gpd_list_lock); 1695 1696 return pm_genpd_add_subdomain(master, subdomain); 1697 } 1698 1699 /** 1700 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. 1701 * @genpd: Master PM domain to remove the subdomain from. 1702 * @subdomain: Subdomain to be removed. 1703 */ 1704 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 1705 struct generic_pm_domain *subdomain) 1706 { 1707 struct gpd_link *link; 1708 int ret = -EINVAL; 1709 1710 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) 1711 return -EINVAL; 1712 1713 start: 1714 genpd_acquire_lock(genpd); 1715 1716 list_for_each_entry(link, &genpd->master_links, master_node) { 1717 if (link->slave != subdomain) 1718 continue; 1719 1720 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); 1721 1722 if (subdomain->status != GPD_STATE_POWER_OFF 1723 && subdomain->status != GPD_STATE_ACTIVE) { 1724 mutex_unlock(&subdomain->lock); 1725 genpd_release_lock(genpd); 1726 goto start; 1727 } 1728 1729 list_del(&link->master_node); 1730 list_del(&link->slave_node); 1731 kfree(link); 1732 if (subdomain->status != GPD_STATE_POWER_OFF) 1733 genpd_sd_counter_dec(genpd); 1734 1735 mutex_unlock(&subdomain->lock); 1736 1737 ret = 0; 1738 break; 1739 } 1740 1741 genpd_release_lock(genpd); 1742 1743 return ret; 1744 } 1745 1746 /** 1747 * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. 1748 * @dev: Device to add the callbacks to. 1749 * @ops: Set of callbacks to add. 1750 * @td: Timing data to add to the device along with the callbacks (optional). 1751 * 1752 * Every call to this routine should be balanced with a call to 1753 * __pm_genpd_remove_callbacks() and they must not be nested. 1754 */ 1755 int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, 1756 struct gpd_timing_data *td) 1757 { 1758 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; 1759 int ret = 0; 1760 1761 if (!(dev && ops)) 1762 return -EINVAL; 1763 1764 gpd_data_new = __pm_genpd_alloc_dev_data(dev); 1765 if (!gpd_data_new) 1766 return -ENOMEM; 1767 1768 pm_runtime_disable(dev); 1769 device_pm_lock(); 1770 1771 ret = dev_pm_get_subsys_data(dev); 1772 if (ret) 1773 goto out; 1774 1775 spin_lock_irq(&dev->power.lock); 1776 1777 if (dev->power.subsys_data->domain_data) { 1778 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 1779 } else { 1780 gpd_data = gpd_data_new; 1781 dev->power.subsys_data->domain_data = &gpd_data->base; 1782 } 1783 gpd_data->refcount++; 1784 gpd_data->ops = *ops; 1785 if (td) 1786 gpd_data->td = *td; 1787 1788 spin_unlock_irq(&dev->power.lock); 1789 1790 out: 1791 device_pm_unlock(); 1792 pm_runtime_enable(dev); 1793 1794 if (gpd_data != gpd_data_new) 1795 __pm_genpd_free_dev_data(dev, gpd_data_new); 1796 1797 return ret; 1798 } 1799 EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); 1800 1801 /** 1802 * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. 1803 * @dev: Device to remove the callbacks from. 1804 * @clear_td: If set, clear the device's timing data too. 1805 * 1806 * This routine can only be called after pm_genpd_add_callbacks(). 1807 */ 1808 int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) 1809 { 1810 struct generic_pm_domain_data *gpd_data = NULL; 1811 bool remove = false; 1812 int ret = 0; 1813 1814 if (!(dev && dev->power.subsys_data)) 1815 return -EINVAL; 1816 1817 pm_runtime_disable(dev); 1818 device_pm_lock(); 1819 1820 spin_lock_irq(&dev->power.lock); 1821 1822 if (dev->power.subsys_data->domain_data) { 1823 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 1824 gpd_data->ops = (struct gpd_dev_ops){ NULL }; 1825 if (clear_td) 1826 gpd_data->td = (struct gpd_timing_data){ 0 }; 1827 1828 if (--gpd_data->refcount == 0) { 1829 dev->power.subsys_data->domain_data = NULL; 1830 remove = true; 1831 } 1832 } else { 1833 ret = -EINVAL; 1834 } 1835 1836 spin_unlock_irq(&dev->power.lock); 1837 1838 device_pm_unlock(); 1839 pm_runtime_enable(dev); 1840 1841 if (ret) 1842 return ret; 1843 1844 dev_pm_put_subsys_data(dev); 1845 if (remove) 1846 __pm_genpd_free_dev_data(dev, gpd_data); 1847 1848 return 0; 1849 } 1850 EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); 1851 1852 /** 1853 * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. 1854 * @genpd: PM domain to be connected with cpuidle. 1855 * @state: cpuidle state this domain can disable/enable. 1856 * 1857 * Make a PM domain behave as though it contained a CPU core, that is, instead 1858 * of calling its power down routine it will enable the given cpuidle state so 1859 * that the cpuidle subsystem can power it down (if possible and desirable). 1860 */ 1861 int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) 1862 { 1863 struct cpuidle_driver *cpuidle_drv; 1864 struct gpd_cpu_data *cpu_data; 1865 struct cpuidle_state *idle_state; 1866 int ret = 0; 1867 1868 if (IS_ERR_OR_NULL(genpd) || state < 0) 1869 return -EINVAL; 1870 1871 genpd_acquire_lock(genpd); 1872 1873 if (genpd->cpu_data) { 1874 ret = -EEXIST; 1875 goto out; 1876 } 1877 cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); 1878 if (!cpu_data) { 1879 ret = -ENOMEM; 1880 goto out; 1881 } 1882 cpuidle_drv = cpuidle_driver_ref(); 1883 if (!cpuidle_drv) { 1884 ret = -ENODEV; 1885 goto err_drv; 1886 } 1887 if (cpuidle_drv->state_count <= state) { 1888 ret = -EINVAL; 1889 goto err; 1890 } 1891 idle_state = &cpuidle_drv->states[state]; 1892 if (!idle_state->disabled) { 1893 ret = -EAGAIN; 1894 goto err; 1895 } 1896 cpu_data->idle_state = idle_state; 1897 cpu_data->saved_exit_latency = idle_state->exit_latency; 1898 genpd->cpu_data = cpu_data; 1899 genpd_recalc_cpu_exit_latency(genpd); 1900 1901 out: 1902 genpd_release_lock(genpd); 1903 return ret; 1904 1905 err: 1906 cpuidle_driver_unref(); 1907 1908 err_drv: 1909 kfree(cpu_data); 1910 goto out; 1911 } 1912 1913 /** 1914 * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. 1915 * @name: Name of the domain to connect to cpuidle. 1916 * @state: cpuidle state this domain can manipulate. 1917 */ 1918 int pm_genpd_name_attach_cpuidle(const char *name, int state) 1919 { 1920 return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); 1921 } 1922 1923 /** 1924 * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. 1925 * @genpd: PM domain to remove the cpuidle connection from. 1926 * 1927 * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the 1928 * given PM domain. 1929 */ 1930 int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) 1931 { 1932 struct gpd_cpu_data *cpu_data; 1933 struct cpuidle_state *idle_state; 1934 int ret = 0; 1935 1936 if (IS_ERR_OR_NULL(genpd)) 1937 return -EINVAL; 1938 1939 genpd_acquire_lock(genpd); 1940 1941 cpu_data = genpd->cpu_data; 1942 if (!cpu_data) { 1943 ret = -ENODEV; 1944 goto out; 1945 } 1946 idle_state = cpu_data->idle_state; 1947 if (!idle_state->disabled) { 1948 ret = -EAGAIN; 1949 goto out; 1950 } 1951 idle_state->exit_latency = cpu_data->saved_exit_latency; 1952 cpuidle_driver_unref(); 1953 genpd->cpu_data = NULL; 1954 kfree(cpu_data); 1955 1956 out: 1957 genpd_release_lock(genpd); 1958 return ret; 1959 } 1960 1961 /** 1962 * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. 1963 * @name: Name of the domain to disconnect cpuidle from. 1964 */ 1965 int pm_genpd_name_detach_cpuidle(const char *name) 1966 { 1967 return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); 1968 } 1969 1970 /* Default device callbacks for generic PM domains. */ 1971 1972 /** 1973 * pm_genpd_default_save_state - Default "save device state" for PM domians. 1974 * @dev: Device to handle. 1975 */ 1976 static int pm_genpd_default_save_state(struct device *dev) 1977 { 1978 int (*cb)(struct device *__dev); 1979 1980 cb = dev_gpd_data(dev)->ops.save_state; 1981 if (cb) 1982 return cb(dev); 1983 1984 if (dev->type && dev->type->pm) 1985 cb = dev->type->pm->runtime_suspend; 1986 else if (dev->class && dev->class->pm) 1987 cb = dev->class->pm->runtime_suspend; 1988 else if (dev->bus && dev->bus->pm) 1989 cb = dev->bus->pm->runtime_suspend; 1990 else 1991 cb = NULL; 1992 1993 if (!cb && dev->driver && dev->driver->pm) 1994 cb = dev->driver->pm->runtime_suspend; 1995 1996 return cb ? cb(dev) : 0; 1997 } 1998 1999 /** 2000 * pm_genpd_default_restore_state - Default PM domians "restore device state". 2001 * @dev: Device to handle. 2002 */ 2003 static int pm_genpd_default_restore_state(struct device *dev) 2004 { 2005 int (*cb)(struct device *__dev); 2006 2007 cb = dev_gpd_data(dev)->ops.restore_state; 2008 if (cb) 2009 return cb(dev); 2010 2011 if (dev->type && dev->type->pm) 2012 cb = dev->type->pm->runtime_resume; 2013 else if (dev->class && dev->class->pm) 2014 cb = dev->class->pm->runtime_resume; 2015 else if (dev->bus && dev->bus->pm) 2016 cb = dev->bus->pm->runtime_resume; 2017 else 2018 cb = NULL; 2019 2020 if (!cb && dev->driver && dev->driver->pm) 2021 cb = dev->driver->pm->runtime_resume; 2022 2023 return cb ? cb(dev) : 0; 2024 } 2025 2026 #ifdef CONFIG_PM_SLEEP 2027 2028 /** 2029 * pm_genpd_default_suspend - Default "device suspend" for PM domians. 2030 * @dev: Device to handle. 2031 */ 2032 static int pm_genpd_default_suspend(struct device *dev) 2033 { 2034 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; 2035 2036 return cb ? cb(dev) : pm_generic_suspend(dev); 2037 } 2038 2039 /** 2040 * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. 2041 * @dev: Device to handle. 2042 */ 2043 static int pm_genpd_default_suspend_late(struct device *dev) 2044 { 2045 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; 2046 2047 return cb ? cb(dev) : pm_generic_suspend_late(dev); 2048 } 2049 2050 /** 2051 * pm_genpd_default_resume_early - Default "early device resume" for PM domians. 2052 * @dev: Device to handle. 2053 */ 2054 static int pm_genpd_default_resume_early(struct device *dev) 2055 { 2056 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; 2057 2058 return cb ? cb(dev) : pm_generic_resume_early(dev); 2059 } 2060 2061 /** 2062 * pm_genpd_default_resume - Default "device resume" for PM domians. 2063 * @dev: Device to handle. 2064 */ 2065 static int pm_genpd_default_resume(struct device *dev) 2066 { 2067 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; 2068 2069 return cb ? cb(dev) : pm_generic_resume(dev); 2070 } 2071 2072 /** 2073 * pm_genpd_default_freeze - Default "device freeze" for PM domians. 2074 * @dev: Device to handle. 2075 */ 2076 static int pm_genpd_default_freeze(struct device *dev) 2077 { 2078 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; 2079 2080 return cb ? cb(dev) : pm_generic_freeze(dev); 2081 } 2082 2083 /** 2084 * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. 2085 * @dev: Device to handle. 2086 */ 2087 static int pm_genpd_default_freeze_late(struct device *dev) 2088 { 2089 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; 2090 2091 return cb ? cb(dev) : pm_generic_freeze_late(dev); 2092 } 2093 2094 /** 2095 * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. 2096 * @dev: Device to handle. 2097 */ 2098 static int pm_genpd_default_thaw_early(struct device *dev) 2099 { 2100 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; 2101 2102 return cb ? cb(dev) : pm_generic_thaw_early(dev); 2103 } 2104 2105 /** 2106 * pm_genpd_default_thaw - Default "device thaw" for PM domians. 2107 * @dev: Device to handle. 2108 */ 2109 static int pm_genpd_default_thaw(struct device *dev) 2110 { 2111 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; 2112 2113 return cb ? cb(dev) : pm_generic_thaw(dev); 2114 } 2115 2116 #else /* !CONFIG_PM_SLEEP */ 2117 2118 #define pm_genpd_default_suspend NULL 2119 #define pm_genpd_default_suspend_late NULL 2120 #define pm_genpd_default_resume_early NULL 2121 #define pm_genpd_default_resume NULL 2122 #define pm_genpd_default_freeze NULL 2123 #define pm_genpd_default_freeze_late NULL 2124 #define pm_genpd_default_thaw_early NULL 2125 #define pm_genpd_default_thaw NULL 2126 2127 #endif /* !CONFIG_PM_SLEEP */ 2128 2129 /** 2130 * pm_genpd_init - Initialize a generic I/O PM domain object. 2131 * @genpd: PM domain object to initialize. 2132 * @gov: PM domain governor to associate with the domain (may be NULL). 2133 * @is_off: Initial value of the domain's power_is_off field. 2134 */ 2135 void pm_genpd_init(struct generic_pm_domain *genpd, 2136 struct dev_power_governor *gov, bool is_off) 2137 { 2138 if (IS_ERR_OR_NULL(genpd)) 2139 return; 2140 2141 INIT_LIST_HEAD(&genpd->master_links); 2142 INIT_LIST_HEAD(&genpd->slave_links); 2143 INIT_LIST_HEAD(&genpd->dev_list); 2144 mutex_init(&genpd->lock); 2145 genpd->gov = gov; 2146 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); 2147 genpd->in_progress = 0; 2148 atomic_set(&genpd->sd_count, 0); 2149 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; 2150 init_waitqueue_head(&genpd->status_wait_queue); 2151 genpd->poweroff_task = NULL; 2152 genpd->resume_count = 0; 2153 genpd->device_count = 0; 2154 genpd->max_off_time_ns = -1; 2155 genpd->max_off_time_changed = true; 2156 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; 2157 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; 2158 genpd->domain.ops.prepare = pm_genpd_prepare; 2159 genpd->domain.ops.suspend = pm_genpd_suspend; 2160 genpd->domain.ops.suspend_late = pm_genpd_suspend_late; 2161 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; 2162 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; 2163 genpd->domain.ops.resume_early = pm_genpd_resume_early; 2164 genpd->domain.ops.resume = pm_genpd_resume; 2165 genpd->domain.ops.freeze = pm_genpd_freeze; 2166 genpd->domain.ops.freeze_late = pm_genpd_freeze_late; 2167 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; 2168 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; 2169 genpd->domain.ops.thaw_early = pm_genpd_thaw_early; 2170 genpd->domain.ops.thaw = pm_genpd_thaw; 2171 genpd->domain.ops.poweroff = pm_genpd_suspend; 2172 genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; 2173 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; 2174 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; 2175 genpd->domain.ops.restore_early = pm_genpd_resume_early; 2176 genpd->domain.ops.restore = pm_genpd_resume; 2177 genpd->domain.ops.complete = pm_genpd_complete; 2178 genpd->dev_ops.save_state = pm_genpd_default_save_state; 2179 genpd->dev_ops.restore_state = pm_genpd_default_restore_state; 2180 genpd->dev_ops.suspend = pm_genpd_default_suspend; 2181 genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; 2182 genpd->dev_ops.resume_early = pm_genpd_default_resume_early; 2183 genpd->dev_ops.resume = pm_genpd_default_resume; 2184 genpd->dev_ops.freeze = pm_genpd_default_freeze; 2185 genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; 2186 genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; 2187 genpd->dev_ops.thaw = pm_genpd_default_thaw; 2188 mutex_lock(&gpd_list_lock); 2189 list_add(&genpd->gpd_list_node, &gpd_list); 2190 mutex_unlock(&gpd_list_lock); 2191 } 2192