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core.c
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linux-6.19.14/drivers/pmdomain/core.c
1// SPDX-License-Identifier: GPL-2.0 2/* 3 * drivers/base/power/domain.c - Common code related to device power domains. 4 * 5 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. 6 */ 7#define pr_fmt(fmt) "PM: " fmt 8 9#include <linux/delay.h> 10#include <linux/idr.h> 11#include <linux/kernel.h> 12#include <linux/io.h> 13#include <linux/platform_device.h> 14#include <linux/pm_opp.h> 15#include <linux/pm_runtime.h> 16#include <linux/pm_domain.h> 17#include <linux/pm_qos.h> 18#include <linux/pm_clock.h> 19#include <linux/slab.h> 20#include <linux/err.h> 21#include <linux/sched.h> 22#include <linux/suspend.h> 23#include <linux/export.h> 24#include <linux/cpu.h> 25#include <linux/debugfs.h> 26 27/* Provides a unique ID for each genpd device */ 28static DEFINE_IDA(genpd_ida); 29 30/* The bus for genpd_providers. */ 31static const struct bus_type genpd_provider_bus_type = { 32 .name = "genpd_provider", 33}; 34 35/* The parent for genpd_provider devices. */ 36static struct device genpd_provider_bus = { 37 .init_name = "genpd_provider", 38}; 39 40#define GENPD_RETRY_MAX_MS 250 /* Approximate */ 41 42#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ 43({ \ 44 type (*__routine)(struct device *__d); \ 45 type __ret = (type)0; \ 46 \ 47 __routine = genpd->dev_ops.callback; \ 48 if (__routine) { \ 49 __ret = __routine(dev); \ 50 } \ 51 __ret; \ 52}) 53 54static LIST_HEAD(gpd_list); 55static DEFINE_MUTEX(gpd_list_lock); 56 57struct genpd_lock_ops { 58 void (*lock)(struct generic_pm_domain *genpd); 59 void (*lock_nested)(struct generic_pm_domain *genpd, int depth); 60 int (*lock_interruptible)(struct generic_pm_domain *genpd); 61 void (*unlock)(struct generic_pm_domain *genpd); 62}; 63 64static void genpd_lock_mtx(struct generic_pm_domain *genpd) 65{ 66 mutex_lock(&genpd->mlock); 67} 68 69static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd, 70 int depth) 71{ 72 mutex_lock_nested(&genpd->mlock, depth); 73} 74 75static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd) 76{ 77 return mutex_lock_interruptible(&genpd->mlock); 78} 79 80static void genpd_unlock_mtx(struct generic_pm_domain *genpd) 81{ 82 return mutex_unlock(&genpd->mlock); 83} 84 85static const struct genpd_lock_ops genpd_mtx_ops = { 86 .lock = genpd_lock_mtx, 87 .lock_nested = genpd_lock_nested_mtx, 88 .lock_interruptible = genpd_lock_interruptible_mtx, 89 .unlock = genpd_unlock_mtx, 90}; 91 92static void genpd_lock_spin(struct generic_pm_domain *genpd) 93 __acquires(&genpd->slock) 94{ 95 unsigned long flags; 96 97 spin_lock_irqsave(&genpd->slock, flags); 98 genpd->lock_flags = flags; 99} 100 101static void genpd_lock_nested_spin(struct generic_pm_domain *genpd, 102 int depth) 103 __acquires(&genpd->slock) 104{ 105 unsigned long flags; 106 107 spin_lock_irqsave_nested(&genpd->slock, flags, depth); 108 genpd->lock_flags = flags; 109} 110 111static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd) 112 __acquires(&genpd->slock) 113{ 114 unsigned long flags; 115 116 spin_lock_irqsave(&genpd->slock, flags); 117 genpd->lock_flags = flags; 118 return 0; 119} 120 121static void genpd_unlock_spin(struct generic_pm_domain *genpd) 122 __releases(&genpd->slock) 123{ 124 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags); 125} 126 127static const struct genpd_lock_ops genpd_spin_ops = { 128 .lock = genpd_lock_spin, 129 .lock_nested = genpd_lock_nested_spin, 130 .lock_interruptible = genpd_lock_interruptible_spin, 131 .unlock = genpd_unlock_spin, 132}; 133 134static void genpd_lock_raw_spin(struct generic_pm_domain *genpd) 135 __acquires(&genpd->raw_slock) 136{ 137 unsigned long flags; 138 139 raw_spin_lock_irqsave(&genpd->raw_slock, flags); 140 genpd->raw_lock_flags = flags; 141} 142 143static void genpd_lock_nested_raw_spin(struct generic_pm_domain *genpd, 144 int depth) 145 __acquires(&genpd->raw_slock) 146{ 147 unsigned long flags; 148 149 raw_spin_lock_irqsave_nested(&genpd->raw_slock, flags, depth); 150 genpd->raw_lock_flags = flags; 151} 152 153static int genpd_lock_interruptible_raw_spin(struct generic_pm_domain *genpd) 154 __acquires(&genpd->raw_slock) 155{ 156 unsigned long flags; 157 158 raw_spin_lock_irqsave(&genpd->raw_slock, flags); 159 genpd->raw_lock_flags = flags; 160 return 0; 161} 162 163static void genpd_unlock_raw_spin(struct generic_pm_domain *genpd) 164 __releases(&genpd->raw_slock) 165{ 166 raw_spin_unlock_irqrestore(&genpd->raw_slock, genpd->raw_lock_flags); 167} 168 169static const struct genpd_lock_ops genpd_raw_spin_ops = { 170 .lock = genpd_lock_raw_spin, 171 .lock_nested = genpd_lock_nested_raw_spin, 172 .lock_interruptible = genpd_lock_interruptible_raw_spin, 173 .unlock = genpd_unlock_raw_spin, 174}; 175 176#define genpd_lock(p) p->lock_ops->lock(p) 177#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d) 178#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p) 179#define genpd_unlock(p) p->lock_ops->unlock(p) 180 181#define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON) 182#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE) 183#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON) 184#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP) 185#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN) 186#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON) 187#define genpd_is_opp_table_fw(genpd) (genpd->flags & GENPD_FLAG_OPP_TABLE_FW) 188#define genpd_is_dev_name_fw(genpd) (genpd->flags & GENPD_FLAG_DEV_NAME_FW) 189#define genpd_is_no_sync_state(genpd) (genpd->flags & GENPD_FLAG_NO_SYNC_STATE) 190#define genpd_is_no_stay_on(genpd) (genpd->flags & GENPD_FLAG_NO_STAY_ON) 191 192static inline bool irq_safe_dev_in_sleep_domain(struct device *dev, 193 const struct generic_pm_domain *genpd) 194{ 195 bool ret; 196 197 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd); 198 199 /* 200 * Warn once if an IRQ safe device is attached to a domain, which 201 * callbacks are allowed to sleep. This indicates a suboptimal 202 * configuration for PM, but it doesn't matter for an always on domain. 203 */ 204 if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) 205 return ret; 206 207 if (ret) 208 dev_warn_once(dev, "PM domain %s will not be powered off\n", 209 dev_name(&genpd->dev)); 210 211 return ret; 212} 213 214static int genpd_runtime_suspend(struct device *dev); 215 216/* 217 * Get the generic PM domain for a particular struct device. 218 * This validates the struct device pointer, the PM domain pointer, 219 * and checks that the PM domain pointer is a real generic PM domain. 220 * Any failure results in NULL being returned. 221 */ 222static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev) 223{ 224 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain)) 225 return NULL; 226 227 /* A genpd's always have its ->runtime_suspend() callback assigned. */ 228 if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend) 229 return pd_to_genpd(dev->pm_domain); 230 231 return NULL; 232} 233 234/* 235 * This should only be used where we are certain that the pm_domain 236 * attached to the device is a genpd domain. 237 */ 238static struct generic_pm_domain *dev_to_genpd(struct device *dev) 239{ 240 if (IS_ERR_OR_NULL(dev->pm_domain)) 241 return ERR_PTR(-EINVAL); 242 243 return pd_to_genpd(dev->pm_domain); 244} 245 246struct device *dev_to_genpd_dev(struct device *dev) 247{ 248 struct generic_pm_domain *genpd = dev_to_genpd(dev); 249 250 if (IS_ERR(genpd)) 251 return ERR_CAST(genpd); 252 253 return &genpd->dev; 254} 255 256static int genpd_stop_dev(const struct generic_pm_domain *genpd, 257 struct device *dev) 258{ 259 return GENPD_DEV_CALLBACK(genpd, int, stop, dev); 260} 261 262static int genpd_start_dev(const struct generic_pm_domain *genpd, 263 struct device *dev) 264{ 265 return GENPD_DEV_CALLBACK(genpd, int, start, dev); 266} 267 268static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) 269{ 270 bool ret = false; 271 272 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) 273 ret = !!atomic_dec_and_test(&genpd->sd_count); 274 275 return ret; 276} 277 278static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) 279{ 280 atomic_inc(&genpd->sd_count); 281 smp_mb__after_atomic(); 282} 283 284#ifdef CONFIG_DEBUG_FS 285static struct dentry *genpd_debugfs_dir; 286 287static void genpd_debug_add(struct generic_pm_domain *genpd); 288 289static void genpd_debug_remove(struct generic_pm_domain *genpd) 290{ 291 if (!genpd_debugfs_dir) 292 return; 293 294 debugfs_lookup_and_remove(dev_name(&genpd->dev), genpd_debugfs_dir); 295} 296 297static void genpd_update_accounting(struct generic_pm_domain *genpd) 298{ 299 u64 delta, now; 300 301 now = ktime_get_mono_fast_ns(); 302 if (now <= genpd->accounting_time) 303 return; 304 305 delta = now - genpd->accounting_time; 306 307 /* 308 * If genpd->status is active, it means we are just 309 * out of off and so update the idle time and vice 310 * versa. 311 */ 312 if (genpd->status == GENPD_STATE_ON) 313 genpd->states[genpd->state_idx].idle_time += delta; 314 else 315 genpd->on_time += delta; 316 317 genpd->accounting_time = now; 318} 319 320static void genpd_reflect_residency(struct generic_pm_domain *genpd) 321{ 322 struct genpd_governor_data *gd = genpd->gd; 323 struct genpd_power_state *state, *next_state; 324 unsigned int state_idx; 325 s64 sleep_ns, target_ns; 326 327 if (!gd || !gd->reflect_residency) 328 return; 329 330 sleep_ns = ktime_to_ns(ktime_sub(ktime_get(), gd->last_enter)); 331 state_idx = genpd->state_idx; 332 state = &genpd->states[state_idx]; 333 target_ns = state->power_off_latency_ns + state->residency_ns; 334 335 if (sleep_ns < target_ns) { 336 state->above++; 337 } else if (state_idx < (genpd->state_count -1)) { 338 next_state = &genpd->states[state_idx + 1]; 339 target_ns = next_state->power_off_latency_ns + 340 next_state->residency_ns; 341 342 if (sleep_ns >= target_ns) 343 state->below++; 344 } 345 346 gd->reflect_residency = false; 347} 348#else 349static inline void genpd_debug_add(struct generic_pm_domain *genpd) {} 350static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {} 351static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {} 352static inline void genpd_reflect_residency(struct generic_pm_domain *genpd) {} 353#endif 354 355static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd, 356 unsigned int state) 357{ 358 struct generic_pm_domain_data *pd_data; 359 struct pm_domain_data *pdd; 360 struct gpd_link *link; 361 362 /* New requested state is same as Max requested state */ 363 if (state == genpd->performance_state) 364 return state; 365 366 /* New requested state is higher than Max requested state */ 367 if (state > genpd->performance_state) 368 return state; 369 370 /* Traverse all devices within the domain */ 371 list_for_each_entry(pdd, &genpd->dev_list, list_node) { 372 pd_data = to_gpd_data(pdd); 373 374 if (pd_data->performance_state > state) 375 state = pd_data->performance_state; 376 } 377 378 /* 379 * Traverse all sub-domains within the domain. This can be 380 * done without any additional locking as the link->performance_state 381 * field is protected by the parent genpd->lock, which is already taken. 382 * 383 * Also note that link->performance_state (subdomain's performance state 384 * requirement to parent domain) is different from 385 * link->child->performance_state (current performance state requirement 386 * of the devices/sub-domains of the subdomain) and so can have a 387 * different value. 388 * 389 * Note that we also take vote from powered-off sub-domains into account 390 * as the same is done for devices right now. 391 */ 392 list_for_each_entry(link, &genpd->parent_links, parent_node) { 393 if (link->performance_state > state) 394 state = link->performance_state; 395 } 396 397 return state; 398} 399 400static int genpd_xlate_performance_state(struct generic_pm_domain *genpd, 401 struct generic_pm_domain *parent, 402 unsigned int pstate) 403{ 404 if (!parent->set_performance_state) 405 return pstate; 406 407 return dev_pm_opp_xlate_performance_state(genpd->opp_table, 408 parent->opp_table, 409 pstate); 410} 411 412static int _genpd_set_performance_state(struct generic_pm_domain *genpd, 413 unsigned int state, int depth); 414 415static void _genpd_rollback_parent_state(struct gpd_link *link, int depth) 416{ 417 struct generic_pm_domain *parent = link->parent; 418 int parent_state; 419 420 genpd_lock_nested(parent, depth + 1); 421 422 parent_state = link->prev_performance_state; 423 link->performance_state = parent_state; 424 425 parent_state = _genpd_reeval_performance_state(parent, parent_state); 426 if (_genpd_set_performance_state(parent, parent_state, depth + 1)) { 427 pr_err("%s: Failed to roll back to %d performance state\n", 428 parent->name, parent_state); 429 } 430 431 genpd_unlock(parent); 432} 433 434static int _genpd_set_parent_state(struct generic_pm_domain *genpd, 435 struct gpd_link *link, 436 unsigned int state, int depth) 437{ 438 struct generic_pm_domain *parent = link->parent; 439 int parent_state, ret; 440 441 /* Find parent's performance state */ 442 ret = genpd_xlate_performance_state(genpd, parent, state); 443 if (unlikely(ret < 0)) 444 return ret; 445 446 parent_state = ret; 447 448 genpd_lock_nested(parent, depth + 1); 449 450 link->prev_performance_state = link->performance_state; 451 link->performance_state = parent_state; 452 453 parent_state = _genpd_reeval_performance_state(parent, parent_state); 454 ret = _genpd_set_performance_state(parent, parent_state, depth + 1); 455 if (ret) 456 link->performance_state = link->prev_performance_state; 457 458 genpd_unlock(parent); 459 460 return ret; 461} 462 463static int _genpd_set_performance_state(struct generic_pm_domain *genpd, 464 unsigned int state, int depth) 465{ 466 struct gpd_link *link = NULL; 467 int ret; 468 469 if (state == genpd->performance_state) 470 return 0; 471 472 /* When scaling up, propagate to parents first in normal order */ 473 if (state > genpd->performance_state) { 474 list_for_each_entry(link, &genpd->child_links, child_node) { 475 ret = _genpd_set_parent_state(genpd, link, state, depth); 476 if (ret) 477 goto rollback_parents_up; 478 } 479 } 480 481 if (genpd->set_performance_state) { 482 ret = genpd->set_performance_state(genpd, state); 483 if (ret) { 484 if (link) 485 goto rollback_parents_up; 486 return ret; 487 } 488 } 489 490 /* When scaling down, propagate to parents last in reverse order */ 491 if (state < genpd->performance_state) { 492 list_for_each_entry_reverse(link, &genpd->child_links, child_node) { 493 ret = _genpd_set_parent_state(genpd, link, state, depth); 494 if (ret) 495 goto rollback_parents_down; 496 } 497 } 498 499 genpd->performance_state = state; 500 return 0; 501 502rollback_parents_up: 503 list_for_each_entry_continue_reverse(link, &genpd->child_links, child_node) 504 _genpd_rollback_parent_state(link, depth); 505 return ret; 506rollback_parents_down: 507 list_for_each_entry_continue(link, &genpd->child_links, child_node) 508 _genpd_rollback_parent_state(link, depth); 509 return ret; 510} 511 512static int genpd_set_performance_state(struct device *dev, unsigned int state) 513{ 514 struct generic_pm_domain *genpd = dev_to_genpd(dev); 515 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); 516 unsigned int prev_state; 517 int ret; 518 519 prev_state = gpd_data->performance_state; 520 if (prev_state == state) 521 return 0; 522 523 gpd_data->performance_state = state; 524 state = _genpd_reeval_performance_state(genpd, state); 525 526 ret = _genpd_set_performance_state(genpd, state, 0); 527 if (ret) 528 gpd_data->performance_state = prev_state; 529 530 return ret; 531} 532 533static int genpd_drop_performance_state(struct device *dev) 534{ 535 unsigned int prev_state = dev_gpd_data(dev)->performance_state; 536 537 if (!genpd_set_performance_state(dev, 0)) 538 return prev_state; 539 540 return 0; 541} 542 543static void genpd_restore_performance_state(struct device *dev, 544 unsigned int state) 545{ 546 if (state) 547 genpd_set_performance_state(dev, state); 548} 549 550static int genpd_dev_pm_set_performance_state(struct device *dev, 551 unsigned int state) 552{ 553 struct generic_pm_domain *genpd = dev_to_genpd(dev); 554 int ret = 0; 555 556 genpd_lock(genpd); 557 if (pm_runtime_suspended(dev)) { 558 dev_gpd_data(dev)->rpm_pstate = state; 559 } else { 560 ret = genpd_set_performance_state(dev, state); 561 if (!ret) 562 dev_gpd_data(dev)->rpm_pstate = 0; 563 } 564 genpd_unlock(genpd); 565 566 return ret; 567} 568 569/** 570 * dev_pm_genpd_set_performance_state- Set performance state of device's power 571 * domain. 572 * 573 * @dev: Device for which the performance-state needs to be set. 574 * @state: Target performance state of the device. This can be set as 0 when the 575 * device doesn't have any performance state constraints left (And so 576 * the device wouldn't participate anymore to find the target 577 * performance state of the genpd). 578 * 579 * It is assumed that the users guarantee that the genpd wouldn't be detached 580 * while this routine is getting called. 581 * 582 * Returns 0 on success and negative error values on failures. 583 */ 584int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state) 585{ 586 struct generic_pm_domain *genpd; 587 588 genpd = dev_to_genpd_safe(dev); 589 if (!genpd) 590 return -ENODEV; 591 592 if (WARN_ON(!dev->power.subsys_data || 593 !dev->power.subsys_data->domain_data)) 594 return -EINVAL; 595 596 return genpd_dev_pm_set_performance_state(dev, state); 597} 598EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state); 599 600/** 601 * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup. 602 * 603 * @dev: Device to handle 604 * @next: impending interrupt/wakeup for the device 605 * 606 * 607 * Allow devices to inform of the next wakeup. It's assumed that the users 608 * guarantee that the genpd wouldn't be detached while this routine is getting 609 * called. Additionally, it's also assumed that @dev isn't runtime suspended 610 * (RPM_SUSPENDED)." 611 * Although devices are expected to update the next_wakeup after the end of 612 * their usecase as well, it is possible the devices themselves may not know 613 * about that, so stale @next will be ignored when powering off the domain. 614 */ 615void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next) 616{ 617 struct generic_pm_domain *genpd; 618 struct gpd_timing_data *td; 619 620 genpd = dev_to_genpd_safe(dev); 621 if (!genpd) 622 return; 623 624 td = to_gpd_data(dev->power.subsys_data->domain_data)->td; 625 if (td) 626 td->next_wakeup = next; 627} 628EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup); 629 630/** 631 * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd 632 * @dev: A device that is attached to the genpd. 633 * 634 * This routine should typically be called for a device, at the point of when a 635 * GENPD_NOTIFY_PRE_OFF notification has been sent for it. 636 * 637 * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no 638 * valid value have been set. 639 */ 640ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev) 641{ 642 struct generic_pm_domain *genpd; 643 644 genpd = dev_to_genpd_safe(dev); 645 if (!genpd) 646 return KTIME_MAX; 647 648 if (genpd->gd) 649 return genpd->gd->next_hrtimer; 650 651 return KTIME_MAX; 652} 653EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer); 654 655/* 656 * dev_pm_genpd_synced_poweroff - Next power off should be synchronous 657 * 658 * @dev: A device that is attached to the genpd. 659 * 660 * Allows a consumer of the genpd to notify the provider that the next power off 661 * should be synchronous. 662 * 663 * It is assumed that the users guarantee that the genpd wouldn't be detached 664 * while this routine is getting called. 665 */ 666void dev_pm_genpd_synced_poweroff(struct device *dev) 667{ 668 struct generic_pm_domain *genpd; 669 670 genpd = dev_to_genpd_safe(dev); 671 if (!genpd) 672 return; 673 674 genpd_lock(genpd); 675 genpd->synced_poweroff = true; 676 genpd_unlock(genpd); 677} 678EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff); 679 680/** 681 * dev_pm_genpd_set_hwmode() - Set the HW mode for the device and its PM domain. 682 * 683 * @dev: Device for which the HW-mode should be changed. 684 * @enable: Value to set or unset the HW-mode. 685 * 686 * Some PM domains can rely on HW signals to control the power for a device. To 687 * allow a consumer driver to switch the behaviour for its device in runtime, 688 * which may be beneficial from a latency or energy point of view, this function 689 * may be called. 690 * 691 * It is assumed that the users guarantee that the genpd wouldn't be detached 692 * while this routine is getting called. 693 * 694 * Return: Returns 0 on success and negative error values on failures. 695 */ 696int dev_pm_genpd_set_hwmode(struct device *dev, bool enable) 697{ 698 struct generic_pm_domain *genpd; 699 int ret = 0; 700 701 genpd = dev_to_genpd_safe(dev); 702 if (!genpd) 703 return -ENODEV; 704 705 if (!genpd->set_hwmode_dev) 706 return -EOPNOTSUPP; 707 708 genpd_lock(genpd); 709 710 if (dev_gpd_data(dev)->hw_mode == enable) 711 goto out; 712 713 ret = genpd->set_hwmode_dev(genpd, dev, enable); 714 if (!ret) 715 dev_gpd_data(dev)->hw_mode = enable; 716 717out: 718 genpd_unlock(genpd); 719 return ret; 720} 721EXPORT_SYMBOL_GPL(dev_pm_genpd_set_hwmode); 722 723/** 724 * dev_pm_genpd_get_hwmode() - Get the HW mode setting for the device. 725 * 726 * @dev: Device for which the current HW-mode setting should be fetched. 727 * 728 * This helper function allows consumer drivers to fetch the current HW mode 729 * setting of its the device. 730 * 731 * It is assumed that the users guarantee that the genpd wouldn't be detached 732 * while this routine is getting called. 733 * 734 * Return: Returns the HW mode setting of device from SW cached hw_mode. 735 */ 736bool dev_pm_genpd_get_hwmode(struct device *dev) 737{ 738 return dev_gpd_data(dev)->hw_mode; 739} 740EXPORT_SYMBOL_GPL(dev_pm_genpd_get_hwmode); 741 742/** 743 * dev_pm_genpd_rpm_always_on() - Control if the PM domain can be powered off. 744 * 745 * @dev: Device for which the PM domain may need to stay on for. 746 * @on: Value to set or unset for the condition. 747 * 748 * For some usecases a consumer driver requires its device to remain power-on 749 * from the PM domain perspective during runtime. This function allows the 750 * behaviour to be dynamically controlled for a device attached to a genpd. 751 * 752 * It is assumed that the users guarantee that the genpd wouldn't be detached 753 * while this routine is getting called. 754 * 755 * Return: Returns 0 on success and negative error values on failures. 756 */ 757int dev_pm_genpd_rpm_always_on(struct device *dev, bool on) 758{ 759 struct generic_pm_domain *genpd; 760 761 genpd = dev_to_genpd_safe(dev); 762 if (!genpd) 763 return -ENODEV; 764 765 genpd_lock(genpd); 766 dev_gpd_data(dev)->rpm_always_on = on; 767 genpd_unlock(genpd); 768 769 return 0; 770} 771EXPORT_SYMBOL_GPL(dev_pm_genpd_rpm_always_on); 772 773/** 774 * dev_pm_genpd_is_on() - Get device's current power domain status 775 * 776 * @dev: Device to get the current power status 777 * 778 * This function checks whether the generic power domain associated with the 779 * given device is on or not by verifying if genpd_status_on equals 780 * GENPD_STATE_ON. 781 * 782 * Note: this function returns the power status of the genpd at the time of the 783 * call. The power status may change after due to activity from other devices 784 * sharing the same genpd. Therefore, this information should not be relied for 785 * long-term decisions about the device power state. 786 * 787 * Return: 'true' if the device's power domain is on, 'false' otherwise. 788 */ 789bool dev_pm_genpd_is_on(struct device *dev) 790{ 791 struct generic_pm_domain *genpd; 792 bool is_on; 793 794 genpd = dev_to_genpd_safe(dev); 795 if (!genpd) 796 return false; 797 798 genpd_lock(genpd); 799 is_on = genpd_status_on(genpd); 800 genpd_unlock(genpd); 801 802 return is_on; 803} 804EXPORT_SYMBOL_GPL(dev_pm_genpd_is_on); 805 806/** 807 * pm_genpd_inc_rejected() - Adjust the rejected/usage counts for an idle-state. 808 * 809 * @genpd: The PM domain the idle-state belongs to. 810 * @state_idx: The index of the idle-state that failed. 811 * 812 * In some special cases the ->power_off() callback is asynchronously powering 813 * off the PM domain, leading to that it may return zero to indicate success, 814 * even though the actual power-off could fail. To account for this correctly in 815 * the rejected/usage counts for the idle-state statistics, users can call this 816 * function to adjust the values. 817 * 818 * It is assumed that the users guarantee that the genpd doesn't get removed 819 * while this routine is getting called. 820 */ 821void pm_genpd_inc_rejected(struct generic_pm_domain *genpd, 822 unsigned int state_idx) 823{ 824 genpd_lock(genpd); 825 genpd->states[genpd->state_idx].rejected++; 826 genpd->states[genpd->state_idx].usage--; 827 genpd_unlock(genpd); 828} 829EXPORT_SYMBOL_GPL(pm_genpd_inc_rejected); 830 831static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed) 832{ 833 unsigned int state_idx = genpd->state_idx; 834 ktime_t time_start; 835 s64 elapsed_ns; 836 int ret; 837 838 /* Notify consumers that we are about to power on. */ 839 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, 840 GENPD_NOTIFY_PRE_ON, 841 GENPD_NOTIFY_OFF, NULL); 842 ret = notifier_to_errno(ret); 843 if (ret) 844 return ret; 845 846 if (!genpd->power_on) 847 goto out; 848 849 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; 850 if (!timed) { 851 ret = genpd->power_on(genpd); 852 if (ret) 853 goto err; 854 855 goto out; 856 } 857 858 time_start = ktime_get(); 859 ret = genpd->power_on(genpd); 860 if (ret) 861 goto err; 862 863 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 864 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns) 865 goto out; 866 867 genpd->states[state_idx].power_on_latency_ns = elapsed_ns; 868 genpd->gd->max_off_time_changed = true; 869 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", 870 dev_name(&genpd->dev), "on", elapsed_ns); 871 872out: 873 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); 874 genpd->synced_poweroff = false; 875 return 0; 876err: 877 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, 878 NULL); 879 return ret; 880} 881 882static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed) 883{ 884 unsigned int state_idx = genpd->state_idx; 885 ktime_t time_start; 886 s64 elapsed_ns; 887 int ret; 888 889 /* Notify consumers that we are about to power off. */ 890 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers, 891 GENPD_NOTIFY_PRE_OFF, 892 GENPD_NOTIFY_ON, NULL); 893 ret = notifier_to_errno(ret); 894 if (ret) 895 return ret; 896 897 if (!genpd->power_off) 898 goto out; 899 900 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode; 901 if (!timed) { 902 ret = genpd->power_off(genpd); 903 if (ret) 904 goto busy; 905 906 goto out; 907 } 908 909 time_start = ktime_get(); 910 ret = genpd->power_off(genpd); 911 if (ret) 912 goto busy; 913 914 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 915 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns) 916 goto out; 917 918 genpd->states[state_idx].power_off_latency_ns = elapsed_ns; 919 genpd->gd->max_off_time_changed = true; 920 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n", 921 dev_name(&genpd->dev), "off", elapsed_ns); 922 923out: 924 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF, 925 NULL); 926 return 0; 927busy: 928 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL); 929 return ret; 930} 931 932/** 933 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off(). 934 * @genpd: PM domain to power off. 935 * 936 * Queue up the execution of genpd_power_off() unless it's already been done 937 * before. 938 */ 939static void genpd_queue_power_off_work(struct generic_pm_domain *genpd) 940{ 941 queue_work(pm_wq, &genpd->power_off_work); 942} 943 944/** 945 * genpd_power_off - Remove power from a given PM domain. 946 * @genpd: PM domain to power down. 947 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the 948 * RPM status of the releated device is in an intermediate state, not yet turned 949 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not 950 * be RPM_SUSPENDED, while it tries to power off the PM domain. 951 * @depth: nesting count for lockdep. 952 * 953 * If all of the @genpd's devices have been suspended and all of its subdomains 954 * have been powered down, remove power from @genpd. 955 */ 956static void genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on, 957 unsigned int depth) 958{ 959 struct pm_domain_data *pdd; 960 struct gpd_link *link; 961 unsigned int not_suspended = 0; 962 963 /* 964 * Do not try to power off the domain in the following situations: 965 * The domain is already in the "power off" state. 966 * System suspend is in progress. 967 * The domain is configured as always on. 968 * The domain was on at boot and still need to stay on. 969 * The domain has a subdomain being powered on. 970 */ 971 if (!genpd_status_on(genpd) || genpd->prepared_count > 0 || 972 genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd) || 973 genpd->stay_on || atomic_read(&genpd->sd_count) > 0) 974 return; 975 976 /* 977 * The children must be in their deepest (powered-off) states to allow 978 * the parent to be powered off. Note that, there's no need for 979 * additional locking, as powering on a child, requires the parent's 980 * lock to be acquired first. 981 */ 982 list_for_each_entry(link, &genpd->parent_links, parent_node) { 983 struct generic_pm_domain *child = link->child; 984 if (child->state_idx < child->state_count - 1) 985 return; 986 } 987 988 list_for_each_entry(pdd, &genpd->dev_list, list_node) { 989 /* 990 * Do not allow PM domain to be powered off, when an IRQ safe 991 * device is part of a non-IRQ safe domain. 992 */ 993 if (!pm_runtime_suspended(pdd->dev) || 994 irq_safe_dev_in_sleep_domain(pdd->dev, genpd)) 995 not_suspended++; 996 997 /* The device may need its PM domain to stay powered on. */ 998 if (to_gpd_data(pdd)->rpm_always_on) 999 return; 1000 } 1001 1002 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on)) 1003 return; 1004 1005 if (genpd->gov && genpd->gov->power_down_ok) { 1006 if (!genpd->gov->power_down_ok(&genpd->domain)) 1007 return; 1008 } 1009 1010 /* Default to shallowest state. */ 1011 if (!genpd->gov) 1012 genpd->state_idx = 0; 1013 1014 /* Don't power off, if a child domain is waiting to power on. */ 1015 if (atomic_read(&genpd->sd_count) > 0) 1016 return; 1017 1018 if (_genpd_power_off(genpd, true)) { 1019 genpd->states[genpd->state_idx].rejected++; 1020 return; 1021 } 1022 1023 genpd->status = GENPD_STATE_OFF; 1024 genpd_update_accounting(genpd); 1025 genpd->states[genpd->state_idx].usage++; 1026 1027 list_for_each_entry(link, &genpd->child_links, child_node) { 1028 genpd_sd_counter_dec(link->parent); 1029 genpd_lock_nested(link->parent, depth + 1); 1030 genpd_power_off(link->parent, false, depth + 1); 1031 genpd_unlock(link->parent); 1032 } 1033} 1034 1035/** 1036 * genpd_power_on - Restore power to a given PM domain and its parents. 1037 * @genpd: PM domain to power up. 1038 * @depth: nesting count for lockdep. 1039 * 1040 * Restore power to @genpd and all of its parents so that it is possible to 1041 * resume a device belonging to it. 1042 */ 1043static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth) 1044{ 1045 struct gpd_link *link; 1046 int ret = 0; 1047 1048 if (genpd_status_on(genpd)) 1049 return 0; 1050 1051 /* Reflect over the entered idle-states residency for debugfs. */ 1052 genpd_reflect_residency(genpd); 1053 1054 /* 1055 * The list is guaranteed not to change while the loop below is being 1056 * executed, unless one of the parents' .power_on() callbacks fiddles 1057 * with it. 1058 */ 1059 list_for_each_entry(link, &genpd->child_links, child_node) { 1060 struct generic_pm_domain *parent = link->parent; 1061 1062 genpd_sd_counter_inc(parent); 1063 1064 genpd_lock_nested(parent, depth + 1); 1065 ret = genpd_power_on(parent, depth + 1); 1066 genpd_unlock(parent); 1067 1068 if (ret) { 1069 genpd_sd_counter_dec(parent); 1070 goto err; 1071 } 1072 } 1073 1074 ret = _genpd_power_on(genpd, true); 1075 if (ret) 1076 goto err; 1077 1078 genpd->status = GENPD_STATE_ON; 1079 genpd_update_accounting(genpd); 1080 1081 return 0; 1082 1083 err: 1084 list_for_each_entry_continue_reverse(link, 1085 &genpd->child_links, 1086 child_node) { 1087 genpd_sd_counter_dec(link->parent); 1088 genpd_lock_nested(link->parent, depth + 1); 1089 genpd_power_off(link->parent, false, depth + 1); 1090 genpd_unlock(link->parent); 1091 } 1092 1093 return ret; 1094} 1095 1096static int genpd_dev_pm_start(struct device *dev) 1097{ 1098 struct generic_pm_domain *genpd = dev_to_genpd(dev); 1099 1100 return genpd_start_dev(genpd, dev); 1101} 1102 1103static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, 1104 unsigned long val, void *ptr) 1105{ 1106 struct generic_pm_domain_data *gpd_data; 1107 struct device *dev; 1108 1109 gpd_data = container_of(nb, struct generic_pm_domain_data, nb); 1110 dev = gpd_data->base.dev; 1111 1112 for (;;) { 1113 struct generic_pm_domain *genpd = ERR_PTR(-ENODATA); 1114 struct pm_domain_data *pdd; 1115 struct gpd_timing_data *td; 1116 1117 spin_lock_irq(&dev->power.lock); 1118 1119 pdd = dev->power.subsys_data ? 1120 dev->power.subsys_data->domain_data : NULL; 1121 if (pdd) { 1122 td = to_gpd_data(pdd)->td; 1123 if (td) { 1124 td->constraint_changed = true; 1125 genpd = dev_to_genpd(dev); 1126 } 1127 } 1128 1129 spin_unlock_irq(&dev->power.lock); 1130 1131 if (!IS_ERR(genpd)) { 1132 genpd_lock(genpd); 1133 genpd->gd->max_off_time_changed = true; 1134 genpd_unlock(genpd); 1135 } 1136 1137 dev = dev->parent; 1138 if (!dev || dev->power.ignore_children) 1139 break; 1140 } 1141 1142 return NOTIFY_DONE; 1143} 1144 1145/** 1146 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. 1147 * @work: Work structure used for scheduling the execution of this function. 1148 */ 1149static void genpd_power_off_work_fn(struct work_struct *work) 1150{ 1151 struct generic_pm_domain *genpd; 1152 1153 genpd = container_of(work, struct generic_pm_domain, power_off_work); 1154 1155 genpd_lock(genpd); 1156 genpd_power_off(genpd, false, 0); 1157 genpd_unlock(genpd); 1158} 1159 1160/** 1161 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks 1162 * @dev: Device to handle. 1163 */ 1164static int __genpd_runtime_suspend(struct device *dev) 1165{ 1166 int (*cb)(struct device *__dev); 1167 1168 if (dev->type && dev->type->pm) 1169 cb = dev->type->pm->runtime_suspend; 1170 else if (dev->class && dev->class->pm) 1171 cb = dev->class->pm->runtime_suspend; 1172 else if (dev->bus && dev->bus->pm) 1173 cb = dev->bus->pm->runtime_suspend; 1174 else 1175 cb = NULL; 1176 1177 if (!cb && dev->driver && dev->driver->pm) 1178 cb = dev->driver->pm->runtime_suspend; 1179 1180 return cb ? cb(dev) : 0; 1181} 1182 1183/** 1184 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks 1185 * @dev: Device to handle. 1186 */ 1187static int __genpd_runtime_resume(struct device *dev) 1188{ 1189 int (*cb)(struct device *__dev); 1190 1191 if (dev->type && dev->type->pm) 1192 cb = dev->type->pm->runtime_resume; 1193 else if (dev->class && dev->class->pm) 1194 cb = dev->class->pm->runtime_resume; 1195 else if (dev->bus && dev->bus->pm) 1196 cb = dev->bus->pm->runtime_resume; 1197 else 1198 cb = NULL; 1199 1200 if (!cb && dev->driver && dev->driver->pm) 1201 cb = dev->driver->pm->runtime_resume; 1202 1203 return cb ? cb(dev) : 0; 1204} 1205 1206/** 1207 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. 1208 * @dev: Device to suspend. 1209 * 1210 * Carry out a runtime suspend of a device under the assumption that its 1211 * pm_domain field points to the domain member of an object of type 1212 * struct generic_pm_domain representing a PM domain consisting of I/O devices. 1213 */ 1214static int genpd_runtime_suspend(struct device *dev) 1215{ 1216 struct generic_pm_domain *genpd; 1217 bool (*suspend_ok)(struct device *__dev); 1218 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); 1219 struct gpd_timing_data *td = gpd_data->td; 1220 bool runtime_pm = pm_runtime_enabled(dev); 1221 ktime_t time_start = 0; 1222 s64 elapsed_ns; 1223 int ret; 1224 1225 dev_dbg(dev, "%s()\n", __func__); 1226 1227 genpd = dev_to_genpd(dev); 1228 if (IS_ERR(genpd)) 1229 return -EINVAL; 1230 1231 /* 1232 * A runtime PM centric subsystem/driver may re-use the runtime PM 1233 * callbacks for other purposes than runtime PM. In those scenarios 1234 * runtime PM is disabled. Under these circumstances, we shall skip 1235 * validating/measuring the PM QoS latency. 1236 */ 1237 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL; 1238 if (runtime_pm && suspend_ok && !suspend_ok(dev)) 1239 return -EBUSY; 1240 1241 /* Measure suspend latency. */ 1242 if (td && runtime_pm) 1243 time_start = ktime_get(); 1244 1245 ret = __genpd_runtime_suspend(dev); 1246 if (ret) 1247 return ret; 1248 1249 ret = genpd_stop_dev(genpd, dev); 1250 if (ret) { 1251 __genpd_runtime_resume(dev); 1252 return ret; 1253 } 1254 1255 /* Update suspend latency value if the measured time exceeds it. */ 1256 if (td && runtime_pm) { 1257 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 1258 if (elapsed_ns > td->suspend_latency_ns) { 1259 td->suspend_latency_ns = elapsed_ns; 1260 dev_dbg(dev, "suspend latency exceeded, %lld ns\n", 1261 elapsed_ns); 1262 genpd->gd->max_off_time_changed = true; 1263 td->constraint_changed = true; 1264 } 1265 } 1266 1267 /* 1268 * If power.irq_safe is set, this routine may be run with 1269 * IRQs disabled, so suspend only if the PM domain also is irq_safe. 1270 */ 1271 if (irq_safe_dev_in_sleep_domain(dev, genpd)) 1272 return 0; 1273 1274 genpd_lock(genpd); 1275 genpd_power_off(genpd, true, 0); 1276 gpd_data->rpm_pstate = genpd_drop_performance_state(dev); 1277 genpd_unlock(genpd); 1278 1279 return 0; 1280} 1281 1282/** 1283 * genpd_runtime_resume - Resume a device belonging to I/O PM domain. 1284 * @dev: Device to resume. 1285 * 1286 * Carry out a runtime resume of a device under the assumption that its 1287 * pm_domain field points to the domain member of an object of type 1288 * struct generic_pm_domain representing a PM domain consisting of I/O devices. 1289 */ 1290static int genpd_runtime_resume(struct device *dev) 1291{ 1292 struct generic_pm_domain *genpd; 1293 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev); 1294 struct gpd_timing_data *td = gpd_data->td; 1295 bool timed = td && pm_runtime_enabled(dev); 1296 ktime_t time_start = 0; 1297 s64 elapsed_ns; 1298 int ret; 1299 1300 dev_dbg(dev, "%s()\n", __func__); 1301 1302 genpd = dev_to_genpd(dev); 1303 if (IS_ERR(genpd)) 1304 return -EINVAL; 1305 1306 /* 1307 * As we don't power off a non IRQ safe domain, which holds 1308 * an IRQ safe device, we don't need to restore power to it. 1309 */ 1310 if (irq_safe_dev_in_sleep_domain(dev, genpd)) 1311 goto out; 1312 1313 genpd_lock(genpd); 1314 genpd_restore_performance_state(dev, gpd_data->rpm_pstate); 1315 ret = genpd_power_on(genpd, 0); 1316 genpd_unlock(genpd); 1317 1318 if (ret) 1319 return ret; 1320 1321 out: 1322 /* Measure resume latency. */ 1323 if (timed) 1324 time_start = ktime_get(); 1325 1326 ret = genpd_start_dev(genpd, dev); 1327 if (ret) 1328 goto err_poweroff; 1329 1330 ret = __genpd_runtime_resume(dev); 1331 if (ret) 1332 goto err_stop; 1333 1334 /* Update resume latency value if the measured time exceeds it. */ 1335 if (timed) { 1336 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); 1337 if (elapsed_ns > td->resume_latency_ns) { 1338 td->resume_latency_ns = elapsed_ns; 1339 dev_dbg(dev, "resume latency exceeded, %lld ns\n", 1340 elapsed_ns); 1341 genpd->gd->max_off_time_changed = true; 1342 td->constraint_changed = true; 1343 } 1344 } 1345 1346 return 0; 1347 1348err_stop: 1349 genpd_stop_dev(genpd, dev); 1350err_poweroff: 1351 if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) { 1352 genpd_lock(genpd); 1353 genpd_power_off(genpd, true, 0); 1354 gpd_data->rpm_pstate = genpd_drop_performance_state(dev); 1355 genpd_unlock(genpd); 1356 } 1357 1358 return ret; 1359} 1360 1361static bool pd_ignore_unused; 1362static int __init pd_ignore_unused_setup(char *__unused) 1363{ 1364 pd_ignore_unused = true; 1365 return 1; 1366} 1367__setup("pd_ignore_unused", pd_ignore_unused_setup); 1368 1369/** 1370 * genpd_power_off_unused - Power off all PM domains with no devices in use. 1371 */ 1372static int __init genpd_power_off_unused(void) 1373{ 1374 struct generic_pm_domain *genpd; 1375 1376 if (pd_ignore_unused) { 1377 pr_warn("genpd: Not disabling unused power domains\n"); 1378 return 0; 1379 } 1380 1381 pr_info("genpd: Disabling unused power domains\n"); 1382 mutex_lock(&gpd_list_lock); 1383 1384 list_for_each_entry(genpd, &gpd_list, gpd_list_node) { 1385 genpd_queue_power_off_work(genpd); 1386 } 1387 1388 mutex_unlock(&gpd_list_lock); 1389 1390 return 0; 1391} 1392late_initcall_sync(genpd_power_off_unused); 1393 1394#ifdef CONFIG_PM_SLEEP 1395 1396/** 1397 * genpd_sync_power_off - Synchronously power off a PM domain and its parents. 1398 * @genpd: PM domain to power off, if possible. 1399 * @use_lock: use the lock. 1400 * @depth: nesting count for lockdep. 1401 * 1402 * Check if the given PM domain can be powered off (during system suspend or 1403 * hibernation) and do that if so. Also, in that case propagate to its parents. 1404 * 1405 * This function is only called in "noirq" and "syscore" stages of system power 1406 * transitions. The "noirq" callbacks may be executed asynchronously, thus in 1407 * these cases the lock must be held. 1408 */ 1409static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock, 1410 unsigned int depth) 1411{ 1412 struct gpd_link *link; 1413 1414 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd)) 1415 return; 1416 1417 if (genpd->suspended_count != genpd->device_count 1418 || atomic_read(&genpd->sd_count) > 0) 1419 return; 1420 1421 /* Check that the children are in their deepest (powered-off) state. */ 1422 list_for_each_entry(link, &genpd->parent_links, parent_node) { 1423 struct generic_pm_domain *child = link->child; 1424 if (child->state_idx < child->state_count - 1) 1425 return; 1426 } 1427 1428 if (genpd->gov && genpd->gov->system_power_down_ok) { 1429 if (!genpd->gov->system_power_down_ok(&genpd->domain)) 1430 return; 1431 } else { 1432 /* Default to the deepest state. */ 1433 genpd->state_idx = genpd->state_count - 1; 1434 } 1435 1436 if (_genpd_power_off(genpd, false)) { 1437 genpd->states[genpd->state_idx].rejected++; 1438 return; 1439 } else { 1440 genpd->states[genpd->state_idx].usage++; 1441 } 1442 1443 genpd->status = GENPD_STATE_OFF; 1444 1445 list_for_each_entry(link, &genpd->child_links, child_node) { 1446 genpd_sd_counter_dec(link->parent); 1447 1448 if (use_lock) 1449 genpd_lock_nested(link->parent, depth + 1); 1450 1451 genpd_sync_power_off(link->parent, use_lock, depth + 1); 1452 1453 if (use_lock) 1454 genpd_unlock(link->parent); 1455 } 1456} 1457 1458/** 1459 * genpd_sync_power_on - Synchronously power on a PM domain and its parents. 1460 * @genpd: PM domain to power on. 1461 * @use_lock: use the lock. 1462 * @depth: nesting count for lockdep. 1463 * 1464 * This function is only called in "noirq" and "syscore" stages of system power 1465 * transitions. The "noirq" callbacks may be executed asynchronously, thus in 1466 * these cases the lock must be held. 1467 */ 1468static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock, 1469 unsigned int depth) 1470{ 1471 struct gpd_link *link; 1472 1473 if (genpd_status_on(genpd)) 1474 return; 1475 1476 list_for_each_entry(link, &genpd->child_links, child_node) { 1477 genpd_sd_counter_inc(link->parent); 1478 1479 if (use_lock) 1480 genpd_lock_nested(link->parent, depth + 1); 1481 1482 genpd_sync_power_on(link->parent, use_lock, depth + 1); 1483 1484 if (use_lock) 1485 genpd_unlock(link->parent); 1486 } 1487 1488 _genpd_power_on(genpd, false); 1489 genpd->status = GENPD_STATE_ON; 1490} 1491 1492/** 1493 * genpd_prepare - Start power transition of a device in a PM domain. 1494 * @dev: Device to start the transition of. 1495 * 1496 * Start a power transition of a device (during a system-wide power transition) 1497 * under the assumption that its pm_domain field points to the domain member of 1498 * an object of type struct generic_pm_domain representing a PM domain 1499 * consisting of I/O devices. 1500 */ 1501static int genpd_prepare(struct device *dev) 1502{ 1503 struct generic_pm_domain *genpd; 1504 int ret; 1505 1506 dev_dbg(dev, "%s()\n", __func__); 1507 1508 genpd = dev_to_genpd(dev); 1509 if (IS_ERR(genpd)) 1510 return -EINVAL; 1511 1512 genpd_lock(genpd); 1513 genpd->prepared_count++; 1514 genpd_unlock(genpd); 1515 1516 ret = pm_generic_prepare(dev); 1517 if (ret < 0) { 1518 genpd_lock(genpd); 1519 1520 genpd->prepared_count--; 1521 1522 genpd_unlock(genpd); 1523 } 1524 1525 /* Never return 1, as genpd don't cope with the direct_complete path. */ 1526 return ret >= 0 ? 0 : ret; 1527} 1528 1529/** 1530 * genpd_finish_suspend - Completion of suspend or hibernation of device in an 1531 * I/O pm domain. 1532 * @dev: Device to suspend. 1533 * @suspend_noirq: Generic suspend_noirq callback. 1534 * @resume_noirq: Generic resume_noirq callback. 1535 * 1536 * Stop the device and remove power from the domain if all devices in it have 1537 * been stopped. 1538 */ 1539static int genpd_finish_suspend(struct device *dev, 1540 int (*suspend_noirq)(struct device *dev), 1541 int (*resume_noirq)(struct device *dev)) 1542{ 1543 struct generic_pm_domain *genpd; 1544 int ret = 0; 1545 1546 genpd = dev_to_genpd(dev); 1547 if (IS_ERR(genpd)) 1548 return -EINVAL; 1549 1550 ret = suspend_noirq(dev); 1551 if (ret) 1552 return ret; 1553 1554 if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) && 1555 !device_out_band_wakeup(dev)) 1556 return 0; 1557 1558 if (genpd->dev_ops.stop && genpd->dev_ops.start && 1559 !pm_runtime_status_suspended(dev)) { 1560 ret = genpd_stop_dev(genpd, dev); 1561 if (ret) { 1562 resume_noirq(dev); 1563 return ret; 1564 } 1565 } 1566 1567 genpd_lock(genpd); 1568 genpd->suspended_count++; 1569 genpd_sync_power_off(genpd, true, 0); 1570 genpd_unlock(genpd); 1571 1572 return 0; 1573} 1574 1575/** 1576 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. 1577 * @dev: Device to suspend. 1578 * 1579 * Stop the device and remove power from the domain if all devices in it have 1580 * been stopped. 1581 */ 1582static int genpd_suspend_noirq(struct device *dev) 1583{ 1584 dev_dbg(dev, "%s()\n", __func__); 1585 1586 return genpd_finish_suspend(dev, 1587 pm_generic_suspend_noirq, 1588 pm_generic_resume_noirq); 1589} 1590 1591/** 1592 * genpd_finish_resume - Completion of resume of device in an I/O PM domain. 1593 * @dev: Device to resume. 1594 * @resume_noirq: Generic resume_noirq callback. 1595 * 1596 * Restore power to the device's PM domain, if necessary, and start the device. 1597 */ 1598static int genpd_finish_resume(struct device *dev, 1599 int (*resume_noirq)(struct device *dev)) 1600{ 1601 struct generic_pm_domain *genpd; 1602 int ret; 1603 1604 dev_dbg(dev, "%s()\n", __func__); 1605 1606 genpd = dev_to_genpd(dev); 1607 if (IS_ERR(genpd)) 1608 return -EINVAL; 1609 1610 if (device_awake_path(dev) && genpd_is_active_wakeup(genpd) && 1611 !device_out_band_wakeup(dev)) 1612 return resume_noirq(dev); 1613 1614 genpd_lock(genpd); 1615 genpd_sync_power_on(genpd, true, 0); 1616 genpd->suspended_count--; 1617 genpd_unlock(genpd); 1618 1619 if (genpd->dev_ops.stop && genpd->dev_ops.start && 1620 !pm_runtime_status_suspended(dev)) { 1621 ret = genpd_start_dev(genpd, dev); 1622 if (ret) 1623 return ret; 1624 } 1625 1626 return pm_generic_resume_noirq(dev); 1627} 1628 1629/** 1630 * genpd_resume_noirq - Start of resume of device in an I/O PM domain. 1631 * @dev: Device to resume. 1632 * 1633 * Restore power to the device's PM domain, if necessary, and start the device. 1634 */ 1635static int genpd_resume_noirq(struct device *dev) 1636{ 1637 dev_dbg(dev, "%s()\n", __func__); 1638 1639 return genpd_finish_resume(dev, pm_generic_resume_noirq); 1640} 1641 1642/** 1643 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. 1644 * @dev: Device to freeze. 1645 * 1646 * Carry out a late freeze of a device under the assumption that its 1647 * pm_domain field points to the domain member of an object of type 1648 * struct generic_pm_domain representing a power domain consisting of I/O 1649 * devices. 1650 */ 1651static int genpd_freeze_noirq(struct device *dev) 1652{ 1653 dev_dbg(dev, "%s()\n", __func__); 1654 1655 return genpd_finish_suspend(dev, 1656 pm_generic_freeze_noirq, 1657 pm_generic_thaw_noirq); 1658} 1659 1660/** 1661 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain. 1662 * @dev: Device to thaw. 1663 * 1664 * Start the device, unless power has been removed from the domain already 1665 * before the system transition. 1666 */ 1667static int genpd_thaw_noirq(struct device *dev) 1668{ 1669 dev_dbg(dev, "%s()\n", __func__); 1670 1671 return genpd_finish_resume(dev, pm_generic_thaw_noirq); 1672} 1673 1674/** 1675 * genpd_poweroff_noirq - Completion of hibernation of device in an 1676 * I/O PM domain. 1677 * @dev: Device to poweroff. 1678 * 1679 * Stop the device and remove power from the domain if all devices in it have 1680 * been stopped. 1681 */ 1682static int genpd_poweroff_noirq(struct device *dev) 1683{ 1684 dev_dbg(dev, "%s()\n", __func__); 1685 1686 return genpd_finish_suspend(dev, 1687 pm_generic_poweroff_noirq, 1688 pm_generic_restore_noirq); 1689} 1690 1691/** 1692 * genpd_restore_noirq - Start of restore of device in an I/O PM domain. 1693 * @dev: Device to resume. 1694 * 1695 * Make sure the domain will be in the same power state as before the 1696 * hibernation the system is resuming from and start the device if necessary. 1697 */ 1698static int genpd_restore_noirq(struct device *dev) 1699{ 1700 dev_dbg(dev, "%s()\n", __func__); 1701 1702 return genpd_finish_resume(dev, pm_generic_restore_noirq); 1703} 1704 1705/** 1706 * genpd_complete - Complete power transition of a device in a power domain. 1707 * @dev: Device to complete the transition of. 1708 * 1709 * Complete a power transition of a device (during a system-wide power 1710 * transition) under the assumption that its pm_domain field points to the 1711 * domain member of an object of type struct generic_pm_domain representing 1712 * a power domain consisting of I/O devices. 1713 */ 1714static void genpd_complete(struct device *dev) 1715{ 1716 struct generic_pm_domain *genpd; 1717 1718 dev_dbg(dev, "%s()\n", __func__); 1719 1720 genpd = dev_to_genpd(dev); 1721 if (IS_ERR(genpd)) 1722 return; 1723 1724 pm_generic_complete(dev); 1725 1726 genpd_lock(genpd); 1727 1728 genpd->prepared_count--; 1729 if (!genpd->prepared_count) 1730 genpd_queue_power_off_work(genpd); 1731 1732 genpd_unlock(genpd); 1733} 1734 1735static void genpd_switch_state(struct device *dev, bool suspend) 1736{ 1737 struct generic_pm_domain *genpd; 1738 bool use_lock; 1739 1740 genpd = dev_to_genpd_safe(dev); 1741 if (!genpd) 1742 return; 1743 1744 use_lock = genpd_is_irq_safe(genpd); 1745 1746 if (use_lock) 1747 genpd_lock(genpd); 1748 1749 if (suspend) { 1750 genpd->suspended_count++; 1751 genpd_sync_power_off(genpd, use_lock, 0); 1752 } else { 1753 genpd_sync_power_on(genpd, use_lock, 0); 1754 genpd->suspended_count--; 1755 } 1756 1757 if (use_lock) 1758 genpd_unlock(genpd); 1759} 1760 1761/** 1762 * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev 1763 * @dev: The device that is attached to the genpd, that can be suspended. 1764 * 1765 * This routine should typically be called for a device that needs to be 1766 * suspended during the syscore suspend phase. It may also be called during 1767 * suspend-to-idle to suspend a corresponding CPU device that is attached to a 1768 * genpd. 1769 */ 1770void dev_pm_genpd_suspend(struct device *dev) 1771{ 1772 genpd_switch_state(dev, true); 1773} 1774EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend); 1775 1776/** 1777 * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev 1778 * @dev: The device that is attached to the genpd, which needs to be resumed. 1779 * 1780 * This routine should typically be called for a device that needs to be resumed 1781 * during the syscore resume phase. It may also be called during suspend-to-idle 1782 * to resume a corresponding CPU device that is attached to a genpd. 1783 */ 1784void dev_pm_genpd_resume(struct device *dev) 1785{ 1786 genpd_switch_state(dev, false); 1787} 1788EXPORT_SYMBOL_GPL(dev_pm_genpd_resume); 1789 1790#else /* !CONFIG_PM_SLEEP */ 1791 1792#define genpd_prepare NULL 1793#define genpd_suspend_noirq NULL 1794#define genpd_resume_noirq NULL 1795#define genpd_freeze_noirq NULL 1796#define genpd_thaw_noirq NULL 1797#define genpd_poweroff_noirq NULL 1798#define genpd_restore_noirq NULL 1799#define genpd_complete NULL 1800 1801#endif /* CONFIG_PM_SLEEP */ 1802 1803static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev, 1804 bool has_governor) 1805{ 1806 struct generic_pm_domain_data *gpd_data; 1807 struct gpd_timing_data *td; 1808 int ret; 1809 1810 ret = dev_pm_get_subsys_data(dev); 1811 if (ret) 1812 return ERR_PTR(ret); 1813 1814 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); 1815 if (!gpd_data) { 1816 ret = -ENOMEM; 1817 goto err_put; 1818 } 1819 1820 gpd_data->base.dev = dev; 1821 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; 1822 1823 /* Allocate data used by a governor. */ 1824 if (has_governor) { 1825 td = kzalloc(sizeof(*td), GFP_KERNEL); 1826 if (!td) { 1827 ret = -ENOMEM; 1828 goto err_free; 1829 } 1830 1831 td->constraint_changed = true; 1832 td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS; 1833 td->next_wakeup = KTIME_MAX; 1834 gpd_data->td = td; 1835 } 1836 1837 spin_lock_irq(&dev->power.lock); 1838 1839 if (dev->power.subsys_data->domain_data) 1840 ret = -EINVAL; 1841 else 1842 dev->power.subsys_data->domain_data = &gpd_data->base; 1843 1844 spin_unlock_irq(&dev->power.lock); 1845 1846 if (ret) 1847 goto err_free; 1848 1849 return gpd_data; 1850 1851 err_free: 1852 kfree(gpd_data->td); 1853 kfree(gpd_data); 1854 err_put: 1855 dev_pm_put_subsys_data(dev); 1856 return ERR_PTR(ret); 1857} 1858 1859static void genpd_free_dev_data(struct device *dev, 1860 struct generic_pm_domain_data *gpd_data) 1861{ 1862 spin_lock_irq(&dev->power.lock); 1863 1864 dev->power.subsys_data->domain_data = NULL; 1865 1866 spin_unlock_irq(&dev->power.lock); 1867 1868 dev_pm_opp_clear_config(gpd_data->opp_token); 1869 kfree(gpd_data->td); 1870 kfree(gpd_data); 1871 dev_pm_put_subsys_data(dev); 1872} 1873 1874static void genpd_update_cpumask(struct generic_pm_domain *genpd, 1875 int cpu, bool set, unsigned int depth) 1876{ 1877 struct gpd_link *link; 1878 1879 if (!genpd_is_cpu_domain(genpd)) 1880 return; 1881 1882 list_for_each_entry(link, &genpd->child_links, child_node) { 1883 struct generic_pm_domain *parent = link->parent; 1884 1885 genpd_lock_nested(parent, depth + 1); 1886 genpd_update_cpumask(parent, cpu, set, depth + 1); 1887 genpd_unlock(parent); 1888 } 1889 1890 if (set) 1891 cpumask_set_cpu(cpu, genpd->cpus); 1892 else 1893 cpumask_clear_cpu(cpu, genpd->cpus); 1894} 1895 1896static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu) 1897{ 1898 if (cpu >= 0) 1899 genpd_update_cpumask(genpd, cpu, true, 0); 1900} 1901 1902static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu) 1903{ 1904 if (cpu >= 0) 1905 genpd_update_cpumask(genpd, cpu, false, 0); 1906} 1907 1908static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev) 1909{ 1910 int cpu; 1911 1912 if (!genpd_is_cpu_domain(genpd)) 1913 return -1; 1914 1915 for_each_possible_cpu(cpu) { 1916 if (get_cpu_device(cpu) == dev) 1917 return cpu; 1918 } 1919 1920 return -1; 1921} 1922 1923static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, 1924 struct device *base_dev) 1925{ 1926 struct genpd_governor_data *gd = genpd->gd; 1927 struct generic_pm_domain_data *gpd_data; 1928 int ret; 1929 1930 dev_dbg(dev, "%s()\n", __func__); 1931 1932 gpd_data = genpd_alloc_dev_data(dev, gd); 1933 if (IS_ERR(gpd_data)) 1934 return PTR_ERR(gpd_data); 1935 1936 gpd_data->cpu = genpd_get_cpu(genpd, base_dev); 1937 1938 gpd_data->hw_mode = genpd->get_hwmode_dev ? genpd->get_hwmode_dev(genpd, dev) : false; 1939 1940 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0; 1941 if (ret) 1942 goto out; 1943 1944 genpd_lock(genpd); 1945 1946 genpd_set_cpumask(genpd, gpd_data->cpu); 1947 1948 genpd->device_count++; 1949 if (gd) 1950 gd->max_off_time_changed = true; 1951 1952 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); 1953 1954 genpd_unlock(genpd); 1955 dev_pm_domain_set(dev, &genpd->domain); 1956 out: 1957 if (ret) 1958 genpd_free_dev_data(dev, gpd_data); 1959 else 1960 dev_pm_qos_add_notifier(dev, &gpd_data->nb, 1961 DEV_PM_QOS_RESUME_LATENCY); 1962 1963 return ret; 1964} 1965 1966/** 1967 * pm_genpd_add_device - Add a device to an I/O PM domain. 1968 * @genpd: PM domain to add the device to. 1969 * @dev: Device to be added. 1970 */ 1971int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev) 1972{ 1973 int ret; 1974 1975 if (!genpd || !dev) 1976 return -EINVAL; 1977 1978 mutex_lock(&gpd_list_lock); 1979 ret = genpd_add_device(genpd, dev, dev); 1980 mutex_unlock(&gpd_list_lock); 1981 1982 return ret; 1983} 1984EXPORT_SYMBOL_GPL(pm_genpd_add_device); 1985 1986static int genpd_remove_device(struct generic_pm_domain *genpd, 1987 struct device *dev) 1988{ 1989 struct generic_pm_domain_data *gpd_data; 1990 struct pm_domain_data *pdd; 1991 int ret = 0; 1992 1993 dev_dbg(dev, "%s()\n", __func__); 1994 1995 pdd = dev->power.subsys_data->domain_data; 1996 gpd_data = to_gpd_data(pdd); 1997 dev_pm_qos_remove_notifier(dev, &gpd_data->nb, 1998 DEV_PM_QOS_RESUME_LATENCY); 1999 2000 genpd_lock(genpd); 2001 2002 if (genpd->prepared_count > 0) { 2003 ret = -EAGAIN; 2004 goto out; 2005 } 2006 2007 genpd->device_count--; 2008 if (genpd->gd) 2009 genpd->gd->max_off_time_changed = true; 2010 2011 genpd_clear_cpumask(genpd, gpd_data->cpu); 2012 2013 list_del_init(&pdd->list_node); 2014 2015 genpd_unlock(genpd); 2016 2017 dev_pm_domain_set(dev, NULL); 2018 2019 if (genpd->detach_dev) 2020 genpd->detach_dev(genpd, dev); 2021 2022 genpd_free_dev_data(dev, gpd_data); 2023 2024 return 0; 2025 2026 out: 2027 genpd_unlock(genpd); 2028 dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY); 2029 2030 return ret; 2031} 2032 2033/** 2034 * pm_genpd_remove_device - Remove a device from an I/O PM domain. 2035 * @dev: Device to be removed. 2036 */ 2037int pm_genpd_remove_device(struct device *dev) 2038{ 2039 struct generic_pm_domain *genpd = dev_to_genpd_safe(dev); 2040 2041 if (!genpd) 2042 return -EINVAL; 2043 2044 return genpd_remove_device(genpd, dev); 2045} 2046EXPORT_SYMBOL_GPL(pm_genpd_remove_device); 2047 2048/** 2049 * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev 2050 * 2051 * @dev: Device that should be associated with the notifier 2052 * @nb: The notifier block to register 2053 * 2054 * Users may call this function to add a genpd power on/off notifier for an 2055 * attached @dev. Only one notifier per device is allowed. The notifier is 2056 * sent when genpd is powering on/off the PM domain. 2057 * 2058 * It is assumed that the user guarantee that the genpd wouldn't be detached 2059 * while this routine is getting called. 2060 * 2061 * Returns 0 on success and negative error values on failures. 2062 */ 2063int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb) 2064{ 2065 struct generic_pm_domain *genpd; 2066 struct generic_pm_domain_data *gpd_data; 2067 int ret; 2068 2069 genpd = dev_to_genpd_safe(dev); 2070 if (!genpd) 2071 return -ENODEV; 2072 2073 if (WARN_ON(!dev->power.subsys_data || 2074 !dev->power.subsys_data->domain_data)) 2075 return -EINVAL; 2076 2077 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 2078 if (gpd_data->power_nb) 2079 return -EEXIST; 2080 2081 genpd_lock(genpd); 2082 ret = raw_notifier_chain_register(&genpd->power_notifiers, nb); 2083 genpd_unlock(genpd); 2084 2085 if (ret) { 2086 dev_warn(dev, "failed to add notifier for PM domain %s\n", 2087 dev_name(&genpd->dev)); 2088 return ret; 2089 } 2090 2091 gpd_data->power_nb = nb; 2092 return 0; 2093} 2094EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier); 2095 2096/** 2097 * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev 2098 * 2099 * @dev: Device that is associated with the notifier 2100 * 2101 * Users may call this function to remove a genpd power on/off notifier for an 2102 * attached @dev. 2103 * 2104 * It is assumed that the user guarantee that the genpd wouldn't be detached 2105 * while this routine is getting called. 2106 * 2107 * Returns 0 on success and negative error values on failures. 2108 */ 2109int dev_pm_genpd_remove_notifier(struct device *dev) 2110{ 2111 struct generic_pm_domain *genpd; 2112 struct generic_pm_domain_data *gpd_data; 2113 int ret; 2114 2115 genpd = dev_to_genpd_safe(dev); 2116 if (!genpd) 2117 return -ENODEV; 2118 2119 if (WARN_ON(!dev->power.subsys_data || 2120 !dev->power.subsys_data->domain_data)) 2121 return -EINVAL; 2122 2123 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 2124 if (!gpd_data->power_nb) 2125 return -ENODEV; 2126 2127 genpd_lock(genpd); 2128 ret = raw_notifier_chain_unregister(&genpd->power_notifiers, 2129 gpd_data->power_nb); 2130 genpd_unlock(genpd); 2131 2132 if (ret) { 2133 dev_warn(dev, "failed to remove notifier for PM domain %s\n", 2134 dev_name(&genpd->dev)); 2135 return ret; 2136 } 2137 2138 gpd_data->power_nb = NULL; 2139 return 0; 2140} 2141EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier); 2142 2143static int genpd_add_subdomain(struct generic_pm_domain *genpd, 2144 struct generic_pm_domain *subdomain) 2145{ 2146 struct gpd_link *link, *itr; 2147 int ret = 0; 2148 2149 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) 2150 || genpd == subdomain) 2151 return -EINVAL; 2152 2153 /* 2154 * If the domain can be powered on/off in an IRQ safe 2155 * context, ensure that the subdomain can also be 2156 * powered on/off in that context. 2157 */ 2158 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) { 2159 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n", 2160 dev_name(&genpd->dev), subdomain->name); 2161 return -EINVAL; 2162 } 2163 2164 link = kzalloc(sizeof(*link), GFP_KERNEL); 2165 if (!link) 2166 return -ENOMEM; 2167 2168 genpd_lock(subdomain); 2169 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); 2170 2171 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) { 2172 ret = -EINVAL; 2173 goto out; 2174 } 2175 2176 list_for_each_entry(itr, &genpd->parent_links, parent_node) { 2177 if (itr->child == subdomain && itr->parent == genpd) { 2178 ret = -EINVAL; 2179 goto out; 2180 } 2181 } 2182 2183 link->parent = genpd; 2184 list_add_tail(&link->parent_node, &genpd->parent_links); 2185 link->child = subdomain; 2186 list_add_tail(&link->child_node, &subdomain->child_links); 2187 if (genpd_status_on(subdomain)) 2188 genpd_sd_counter_inc(genpd); 2189 2190 out: 2191 genpd_unlock(genpd); 2192 genpd_unlock(subdomain); 2193 if (ret) 2194 kfree(link); 2195 return ret; 2196} 2197 2198/** 2199 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. 2200 * @genpd: Leader PM domain to add the subdomain to. 2201 * @subdomain: Subdomain to be added. 2202 */ 2203int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, 2204 struct generic_pm_domain *subdomain) 2205{ 2206 int ret; 2207 2208 mutex_lock(&gpd_list_lock); 2209 ret = genpd_add_subdomain(genpd, subdomain); 2210 mutex_unlock(&gpd_list_lock); 2211 2212 return ret; 2213} 2214EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain); 2215 2216/** 2217 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. 2218 * @genpd: Leader PM domain to remove the subdomain from. 2219 * @subdomain: Subdomain to be removed. 2220 */ 2221int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, 2222 struct generic_pm_domain *subdomain) 2223{ 2224 struct gpd_link *l, *link; 2225 int ret = -EINVAL; 2226 2227 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) 2228 return -EINVAL; 2229 2230 genpd_lock(subdomain); 2231 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING); 2232 2233 if (!list_empty(&subdomain->parent_links) || subdomain->device_count) { 2234 pr_warn("%s: unable to remove subdomain %s\n", 2235 dev_name(&genpd->dev), subdomain->name); 2236 ret = -EBUSY; 2237 goto out; 2238 } 2239 2240 list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) { 2241 if (link->child != subdomain) 2242 continue; 2243 2244 list_del(&link->parent_node); 2245 list_del(&link->child_node); 2246 kfree(link); 2247 if (genpd_status_on(subdomain)) 2248 genpd_sd_counter_dec(genpd); 2249 2250 ret = 0; 2251 break; 2252 } 2253 2254out: 2255 genpd_unlock(genpd); 2256 genpd_unlock(subdomain); 2257 2258 return ret; 2259} 2260EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain); 2261 2262static void genpd_free_default_power_state(struct genpd_power_state *states, 2263 unsigned int state_count) 2264{ 2265 kfree(states); 2266} 2267 2268static int genpd_set_default_power_state(struct generic_pm_domain *genpd) 2269{ 2270 struct genpd_power_state *state; 2271 2272 state = kzalloc(sizeof(*state), GFP_KERNEL); 2273 if (!state) 2274 return -ENOMEM; 2275 2276 genpd->states = state; 2277 genpd->state_count = 1; 2278 genpd->free_states = genpd_free_default_power_state; 2279 2280 return 0; 2281} 2282 2283static void genpd_provider_release(struct device *dev) 2284{ 2285 /* nothing to be done here */ 2286} 2287 2288static int genpd_alloc_data(struct generic_pm_domain *genpd) 2289{ 2290 struct genpd_governor_data *gd = NULL; 2291 int ret; 2292 2293 if (genpd_is_cpu_domain(genpd) && 2294 !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL)) 2295 return -ENOMEM; 2296 2297 if (genpd->gov) { 2298 gd = kzalloc(sizeof(*gd), GFP_KERNEL); 2299 if (!gd) { 2300 ret = -ENOMEM; 2301 goto free; 2302 } 2303 2304 gd->max_off_time_ns = -1; 2305 gd->max_off_time_changed = true; 2306 gd->next_wakeup = KTIME_MAX; 2307 gd->next_hrtimer = KTIME_MAX; 2308 } 2309 2310 /* Use only one "off" state if there were no states declared */ 2311 if (genpd->state_count == 0) { 2312 ret = genpd_set_default_power_state(genpd); 2313 if (ret) 2314 goto free; 2315 } 2316 2317 genpd->gd = gd; 2318 device_initialize(&genpd->dev); 2319 genpd->dev.release = genpd_provider_release; 2320 genpd->dev.bus = &genpd_provider_bus_type; 2321 genpd->dev.parent = &genpd_provider_bus; 2322 2323 if (!genpd_is_dev_name_fw(genpd)) { 2324 dev_set_name(&genpd->dev, "%s", genpd->name); 2325 } else { 2326 ret = ida_alloc(&genpd_ida, GFP_KERNEL); 2327 if (ret < 0) 2328 goto put; 2329 2330 genpd->device_id = ret; 2331 dev_set_name(&genpd->dev, "%s_%u", genpd->name, genpd->device_id); 2332 } 2333 2334 return 0; 2335put: 2336 put_device(&genpd->dev); 2337 if (genpd->free_states == genpd_free_default_power_state) { 2338 kfree(genpd->states); 2339 genpd->states = NULL; 2340 } 2341free: 2342 if (genpd_is_cpu_domain(genpd)) 2343 free_cpumask_var(genpd->cpus); 2344 kfree(gd); 2345 return ret; 2346} 2347 2348static void genpd_free_data(struct generic_pm_domain *genpd) 2349{ 2350 put_device(&genpd->dev); 2351 if (genpd->device_id != -ENXIO) 2352 ida_free(&genpd_ida, genpd->device_id); 2353 if (genpd_is_cpu_domain(genpd)) 2354 free_cpumask_var(genpd->cpus); 2355 if (genpd->free_states) 2356 genpd->free_states(genpd->states, genpd->state_count); 2357 kfree(genpd->gd); 2358} 2359 2360static void genpd_lock_init(struct generic_pm_domain *genpd) 2361{ 2362 if (genpd_is_cpu_domain(genpd)) { 2363 raw_spin_lock_init(&genpd->raw_slock); 2364 genpd->lock_ops = &genpd_raw_spin_ops; 2365 } else if (genpd_is_irq_safe(genpd)) { 2366 spin_lock_init(&genpd->slock); 2367 genpd->lock_ops = &genpd_spin_ops; 2368 } else { 2369 mutex_init(&genpd->mlock); 2370 genpd->lock_ops = &genpd_mtx_ops; 2371 } 2372} 2373 2374#ifdef CONFIG_PM_GENERIC_DOMAINS_OF 2375static void genpd_set_stay_on(struct generic_pm_domain *genpd, bool is_off) 2376{ 2377 genpd->stay_on = !genpd_is_no_stay_on(genpd) && !is_off; 2378} 2379#else 2380static void genpd_set_stay_on(struct generic_pm_domain *genpd, bool is_off) 2381{ 2382 genpd->stay_on = false; 2383} 2384#endif 2385 2386/** 2387 * pm_genpd_init - Initialize a generic I/O PM domain object. 2388 * @genpd: PM domain object to initialize. 2389 * @gov: PM domain governor to associate with the domain (may be NULL). 2390 * @is_off: Initial value of the domain's power_is_off field. 2391 * 2392 * Returns 0 on successful initialization, else a negative error code. 2393 */ 2394int pm_genpd_init(struct generic_pm_domain *genpd, 2395 struct dev_power_governor *gov, bool is_off) 2396{ 2397 int ret; 2398 2399 if (IS_ERR_OR_NULL(genpd)) 2400 return -EINVAL; 2401 2402 INIT_LIST_HEAD(&genpd->parent_links); 2403 INIT_LIST_HEAD(&genpd->child_links); 2404 INIT_LIST_HEAD(&genpd->dev_list); 2405 RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers); 2406 genpd_lock_init(genpd); 2407 genpd->gov = gov; 2408 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); 2409 atomic_set(&genpd->sd_count, 0); 2410 genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON; 2411 genpd_set_stay_on(genpd, is_off); 2412 genpd->sync_state = GENPD_SYNC_STATE_OFF; 2413 genpd->device_count = 0; 2414 genpd->provider = NULL; 2415 genpd->device_id = -ENXIO; 2416 genpd->has_provider = false; 2417 genpd->opp_table = NULL; 2418 genpd->accounting_time = ktime_get_mono_fast_ns(); 2419 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend; 2420 genpd->domain.ops.runtime_resume = genpd_runtime_resume; 2421 genpd->domain.ops.prepare = genpd_prepare; 2422 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq; 2423 genpd->domain.ops.resume_noirq = genpd_resume_noirq; 2424 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq; 2425 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq; 2426 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq; 2427 genpd->domain.ops.restore_noirq = genpd_restore_noirq; 2428 genpd->domain.ops.complete = genpd_complete; 2429 genpd->domain.start = genpd_dev_pm_start; 2430 genpd->domain.set_performance_state = genpd_dev_pm_set_performance_state; 2431 2432 if (genpd->flags & GENPD_FLAG_PM_CLK) { 2433 genpd->dev_ops.stop = pm_clk_suspend; 2434 genpd->dev_ops.start = pm_clk_resume; 2435 } 2436 2437 /* The always-on governor works better with the corresponding flag. */ 2438 if (gov == &pm_domain_always_on_gov) 2439 genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON; 2440 2441 /* Always-on domains must be powered on at initialization. */ 2442 if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) && 2443 !genpd_status_on(genpd)) { 2444 pr_err("always-on PM domain %s is not on\n", genpd->name); 2445 return -EINVAL; 2446 } 2447 2448 /* Multiple states but no governor doesn't make sense. */ 2449 if (!gov && genpd->state_count > 1) 2450 pr_warn("%s: no governor for states\n", genpd->name); 2451 2452 ret = genpd_alloc_data(genpd); 2453 if (ret) 2454 return ret; 2455 2456 mutex_lock(&gpd_list_lock); 2457 list_add(&genpd->gpd_list_node, &gpd_list); 2458 mutex_unlock(&gpd_list_lock); 2459 genpd_debug_add(genpd); 2460 2461 return 0; 2462} 2463EXPORT_SYMBOL_GPL(pm_genpd_init); 2464 2465static int genpd_remove(struct generic_pm_domain *genpd) 2466{ 2467 struct gpd_link *l, *link; 2468 2469 if (IS_ERR_OR_NULL(genpd)) 2470 return -EINVAL; 2471 2472 genpd_lock(genpd); 2473 2474 if (genpd->has_provider) { 2475 genpd_unlock(genpd); 2476 pr_err("Provider present, unable to remove %s\n", dev_name(&genpd->dev)); 2477 return -EBUSY; 2478 } 2479 2480 if (!list_empty(&genpd->parent_links) || genpd->device_count) { 2481 genpd_unlock(genpd); 2482 pr_err("%s: unable to remove %s\n", __func__, dev_name(&genpd->dev)); 2483 return -EBUSY; 2484 } 2485 2486 list_for_each_entry_safe(link, l, &genpd->child_links, child_node) { 2487 list_del(&link->parent_node); 2488 list_del(&link->child_node); 2489 kfree(link); 2490 } 2491 2492 list_del(&genpd->gpd_list_node); 2493 genpd_unlock(genpd); 2494 genpd_debug_remove(genpd); 2495 cancel_work_sync(&genpd->power_off_work); 2496 genpd_free_data(genpd); 2497 2498 pr_debug("%s: removed %s\n", __func__, dev_name(&genpd->dev)); 2499 2500 return 0; 2501} 2502 2503/** 2504 * pm_genpd_remove - Remove a generic I/O PM domain 2505 * @genpd: Pointer to PM domain that is to be removed. 2506 * 2507 * To remove the PM domain, this function: 2508 * - Removes the PM domain as a subdomain to any parent domains, 2509 * if it was added. 2510 * - Removes the PM domain from the list of registered PM domains. 2511 * 2512 * The PM domain will only be removed, if the associated provider has 2513 * been removed, it is not a parent to any other PM domain and has no 2514 * devices associated with it. 2515 */ 2516int pm_genpd_remove(struct generic_pm_domain *genpd) 2517{ 2518 int ret; 2519 2520 mutex_lock(&gpd_list_lock); 2521 ret = genpd_remove(genpd); 2522 mutex_unlock(&gpd_list_lock); 2523 2524 return ret; 2525} 2526EXPORT_SYMBOL_GPL(pm_genpd_remove); 2527 2528#ifdef CONFIG_PM_GENERIC_DOMAINS_OF 2529 2530/* 2531 * Device Tree based PM domain providers. 2532 * 2533 * The code below implements generic device tree based PM domain providers that 2534 * bind device tree nodes with generic PM domains registered in the system. 2535 * 2536 * Any driver that registers generic PM domains and needs to support binding of 2537 * devices to these domains is supposed to register a PM domain provider, which 2538 * maps a PM domain specifier retrieved from the device tree to a PM domain. 2539 * 2540 * Two simple mapping functions have been provided for convenience: 2541 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping. 2542 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by 2543 * index. 2544 */ 2545 2546/** 2547 * struct of_genpd_provider - PM domain provider registration structure 2548 * @link: Entry in global list of PM domain providers 2549 * @node: Pointer to device tree node of PM domain provider 2550 * @xlate: Provider-specific xlate callback mapping a set of specifier cells 2551 * into a PM domain. 2552 * @data: context pointer to be passed into @xlate callback 2553 */ 2554struct of_genpd_provider { 2555 struct list_head link; 2556 struct device_node *node; 2557 genpd_xlate_t xlate; 2558 void *data; 2559}; 2560 2561/* List of registered PM domain providers. */ 2562static LIST_HEAD(of_genpd_providers); 2563/* Mutex to protect the list above. */ 2564static DEFINE_MUTEX(of_genpd_mutex); 2565/* Used to prevent registering devices before the bus. */ 2566static bool genpd_bus_registered; 2567 2568/** 2569 * genpd_xlate_simple() - Xlate function for direct node-domain mapping 2570 * @genpdspec: OF phandle args to map into a PM domain 2571 * @data: xlate function private data - pointer to struct generic_pm_domain 2572 * 2573 * This is a generic xlate function that can be used to model PM domains that 2574 * have their own device tree nodes. The private data of xlate function needs 2575 * to be a valid pointer to struct generic_pm_domain. 2576 */ 2577static struct generic_pm_domain *genpd_xlate_simple( 2578 const struct of_phandle_args *genpdspec, 2579 void *data) 2580{ 2581 return data; 2582} 2583 2584/** 2585 * genpd_xlate_onecell() - Xlate function using a single index. 2586 * @genpdspec: OF phandle args to map into a PM domain 2587 * @data: xlate function private data - pointer to struct genpd_onecell_data 2588 * 2589 * This is a generic xlate function that can be used to model simple PM domain 2590 * controllers that have one device tree node and provide multiple PM domains. 2591 * A single cell is used as an index into an array of PM domains specified in 2592 * the genpd_onecell_data struct when registering the provider. 2593 */ 2594static struct generic_pm_domain *genpd_xlate_onecell( 2595 const struct of_phandle_args *genpdspec, 2596 void *data) 2597{ 2598 struct genpd_onecell_data *genpd_data = data; 2599 unsigned int idx = genpdspec->args[0]; 2600 2601 if (genpdspec->args_count != 1) 2602 return ERR_PTR(-EINVAL); 2603 2604 if (idx >= genpd_data->num_domains) { 2605 pr_err("%s: invalid domain index %u\n", __func__, idx); 2606 return ERR_PTR(-EINVAL); 2607 } 2608 2609 if (!genpd_data->domains[idx]) 2610 return ERR_PTR(-ENOENT); 2611 2612 return genpd_data->domains[idx]; 2613} 2614 2615/** 2616 * genpd_add_provider() - Register a PM domain provider for a node 2617 * @np: Device node pointer associated with the PM domain provider. 2618 * @xlate: Callback for decoding PM domain from phandle arguments. 2619 * @data: Context pointer for @xlate callback. 2620 */ 2621static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate, 2622 void *data) 2623{ 2624 struct of_genpd_provider *cp; 2625 2626 cp = kzalloc(sizeof(*cp), GFP_KERNEL); 2627 if (!cp) 2628 return -ENOMEM; 2629 2630 cp->node = of_node_get(np); 2631 cp->data = data; 2632 cp->xlate = xlate; 2633 fwnode_dev_initialized(of_fwnode_handle(np), true); 2634 2635 mutex_lock(&of_genpd_mutex); 2636 list_add(&cp->link, &of_genpd_providers); 2637 mutex_unlock(&of_genpd_mutex); 2638 pr_debug("Added domain provider from %pOF\n", np); 2639 2640 return 0; 2641} 2642 2643static bool genpd_present(const struct generic_pm_domain *genpd) 2644{ 2645 bool ret = false; 2646 const struct generic_pm_domain *gpd; 2647 2648 mutex_lock(&gpd_list_lock); 2649 list_for_each_entry(gpd, &gpd_list, gpd_list_node) { 2650 if (gpd == genpd) { 2651 ret = true; 2652 break; 2653 } 2654 } 2655 mutex_unlock(&gpd_list_lock); 2656 2657 return ret; 2658} 2659 2660static void genpd_sync_state(struct device *dev) 2661{ 2662 return of_genpd_sync_state(dev->of_node); 2663} 2664 2665/** 2666 * of_genpd_add_provider_simple() - Register a simple PM domain provider 2667 * @np: Device node pointer associated with the PM domain provider. 2668 * @genpd: Pointer to PM domain associated with the PM domain provider. 2669 */ 2670int of_genpd_add_provider_simple(struct device_node *np, 2671 struct generic_pm_domain *genpd) 2672{ 2673 struct fwnode_handle *fwnode; 2674 struct device *dev; 2675 int ret; 2676 2677 if (!np || !genpd) 2678 return -EINVAL; 2679 2680 if (!genpd_bus_registered) 2681 return -ENODEV; 2682 2683 if (!genpd_present(genpd)) 2684 return -EINVAL; 2685 2686 genpd->dev.of_node = np; 2687 2688 fwnode = of_fwnode_handle(np); 2689 dev = get_dev_from_fwnode(fwnode); 2690 if (!dev && !genpd_is_no_sync_state(genpd)) { 2691 genpd->sync_state = GENPD_SYNC_STATE_SIMPLE; 2692 device_set_node(&genpd->dev, fwnode); 2693 } else { 2694 dev_set_drv_sync_state(dev, genpd_sync_state); 2695 } 2696 2697 put_device(dev); 2698 2699 ret = device_add(&genpd->dev); 2700 if (ret) 2701 return ret; 2702 2703 /* Parse genpd OPP table */ 2704 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { 2705 ret = dev_pm_opp_of_add_table(&genpd->dev); 2706 if (ret) { 2707 dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n"); 2708 goto err_del; 2709 } 2710 2711 /* 2712 * Save table for faster processing while setting performance 2713 * state. 2714 */ 2715 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); 2716 WARN_ON(IS_ERR(genpd->opp_table)); 2717 } 2718 2719 ret = genpd_add_provider(np, genpd_xlate_simple, genpd); 2720 if (ret) 2721 goto err_opp; 2722 2723 genpd->provider = fwnode; 2724 genpd->has_provider = true; 2725 2726 return 0; 2727 2728err_opp: 2729 if (genpd->opp_table) { 2730 dev_pm_opp_put_opp_table(genpd->opp_table); 2731 dev_pm_opp_of_remove_table(&genpd->dev); 2732 } 2733err_del: 2734 device_del(&genpd->dev); 2735 return ret; 2736} 2737EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple); 2738 2739/** 2740 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider 2741 * @np: Device node pointer associated with the PM domain provider. 2742 * @data: Pointer to the data associated with the PM domain provider. 2743 */ 2744int of_genpd_add_provider_onecell(struct device_node *np, 2745 struct genpd_onecell_data *data) 2746{ 2747 struct generic_pm_domain *genpd; 2748 struct fwnode_handle *fwnode; 2749 struct device *dev; 2750 unsigned int i; 2751 int ret = -EINVAL; 2752 bool sync_state = false; 2753 2754 if (!np || !data) 2755 return -EINVAL; 2756 2757 if (!genpd_bus_registered) 2758 return -ENODEV; 2759 2760 if (!data->xlate) 2761 data->xlate = genpd_xlate_onecell; 2762 2763 fwnode = of_fwnode_handle(np); 2764 dev = get_dev_from_fwnode(fwnode); 2765 if (!dev) 2766 sync_state = true; 2767 else 2768 dev_set_drv_sync_state(dev, genpd_sync_state); 2769 2770 put_device(dev); 2771 2772 for (i = 0; i < data->num_domains; i++) { 2773 genpd = data->domains[i]; 2774 2775 if (!genpd) 2776 continue; 2777 if (!genpd_present(genpd)) 2778 goto error; 2779 2780 genpd->dev.of_node = np; 2781 2782 if (sync_state && !genpd_is_no_sync_state(genpd)) { 2783 genpd->sync_state = GENPD_SYNC_STATE_ONECELL; 2784 device_set_node(&genpd->dev, fwnode); 2785 sync_state = false; 2786 } 2787 2788 ret = device_add(&genpd->dev); 2789 if (ret) 2790 goto error; 2791 2792 /* Parse genpd OPP table */ 2793 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) { 2794 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i); 2795 if (ret) { 2796 dev_err_probe(&genpd->dev, ret, 2797 "Failed to add OPP table for index %d\n", i); 2798 device_del(&genpd->dev); 2799 goto error; 2800 } 2801 2802 /* 2803 * Save table for faster processing while setting 2804 * performance state. 2805 */ 2806 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev); 2807 WARN_ON(IS_ERR(genpd->opp_table)); 2808 } 2809 2810 genpd->provider = fwnode; 2811 genpd->has_provider = true; 2812 } 2813 2814 ret = genpd_add_provider(np, data->xlate, data); 2815 if (ret < 0) 2816 goto error; 2817 2818 return 0; 2819 2820error: 2821 while (i--) { 2822 genpd = data->domains[i]; 2823 2824 if (!genpd) 2825 continue; 2826 2827 genpd->provider = NULL; 2828 genpd->has_provider = false; 2829 2830 if (genpd->opp_table) { 2831 dev_pm_opp_put_opp_table(genpd->opp_table); 2832 dev_pm_opp_of_remove_table(&genpd->dev); 2833 } 2834 2835 device_del(&genpd->dev); 2836 } 2837 2838 return ret; 2839} 2840EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell); 2841 2842/** 2843 * of_genpd_del_provider() - Remove a previously registered PM domain provider 2844 * @np: Device node pointer associated with the PM domain provider 2845 */ 2846void of_genpd_del_provider(struct device_node *np) 2847{ 2848 struct of_genpd_provider *cp, *tmp; 2849 struct generic_pm_domain *gpd; 2850 2851 mutex_lock(&gpd_list_lock); 2852 mutex_lock(&of_genpd_mutex); 2853 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) { 2854 if (cp->node == np) { 2855 /* 2856 * For each PM domain associated with the 2857 * provider, set the 'has_provider' to false 2858 * so that the PM domain can be safely removed. 2859 */ 2860 list_for_each_entry(gpd, &gpd_list, gpd_list_node) { 2861 if (gpd->provider == of_fwnode_handle(np)) { 2862 gpd->has_provider = false; 2863 2864 if (gpd->opp_table) { 2865 dev_pm_opp_put_opp_table(gpd->opp_table); 2866 dev_pm_opp_of_remove_table(&gpd->dev); 2867 } 2868 2869 device_del(&gpd->dev); 2870 } 2871 } 2872 2873 fwnode_dev_initialized(of_fwnode_handle(cp->node), false); 2874 list_del(&cp->link); 2875 of_node_put(cp->node); 2876 kfree(cp); 2877 break; 2878 } 2879 } 2880 mutex_unlock(&of_genpd_mutex); 2881 mutex_unlock(&gpd_list_lock); 2882} 2883EXPORT_SYMBOL_GPL(of_genpd_del_provider); 2884 2885/** 2886 * genpd_get_from_provider() - Look-up PM domain 2887 * @genpdspec: OF phandle args to use for look-up 2888 * 2889 * Looks for a PM domain provider under the node specified by @genpdspec and if 2890 * found, uses xlate function of the provider to map phandle args to a PM 2891 * domain. 2892 * 2893 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR() 2894 * on failure. 2895 */ 2896static struct generic_pm_domain *genpd_get_from_provider( 2897 const struct of_phandle_args *genpdspec) 2898{ 2899 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT); 2900 struct of_genpd_provider *provider; 2901 2902 if (!genpdspec) 2903 return ERR_PTR(-EINVAL); 2904 2905 mutex_lock(&of_genpd_mutex); 2906 2907 /* Check if we have such a provider in our array */ 2908 list_for_each_entry(provider, &of_genpd_providers, link) { 2909 if (provider->node == genpdspec->np) 2910 genpd = provider->xlate(genpdspec, provider->data); 2911 if (!IS_ERR(genpd)) 2912 break; 2913 } 2914 2915 mutex_unlock(&of_genpd_mutex); 2916 2917 return genpd; 2918} 2919 2920/** 2921 * of_genpd_add_device() - Add a device to an I/O PM domain 2922 * @genpdspec: OF phandle args to use for look-up PM domain 2923 * @dev: Device to be added. 2924 * 2925 * Looks-up an I/O PM domain based upon phandle args provided and adds 2926 * the device to the PM domain. Returns a negative error code on failure. 2927 */ 2928int of_genpd_add_device(const struct of_phandle_args *genpdspec, struct device *dev) 2929{ 2930 struct generic_pm_domain *genpd; 2931 int ret; 2932 2933 if (!dev) 2934 return -EINVAL; 2935 2936 mutex_lock(&gpd_list_lock); 2937 2938 genpd = genpd_get_from_provider(genpdspec); 2939 if (IS_ERR(genpd)) { 2940 ret = PTR_ERR(genpd); 2941 goto out; 2942 } 2943 2944 ret = genpd_add_device(genpd, dev, dev); 2945 2946out: 2947 mutex_unlock(&gpd_list_lock); 2948 2949 return ret; 2950} 2951EXPORT_SYMBOL_GPL(of_genpd_add_device); 2952 2953/** 2954 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain. 2955 * @parent_spec: OF phandle args to use for parent PM domain look-up 2956 * @subdomain_spec: OF phandle args to use for subdomain look-up 2957 * 2958 * Looks-up a parent PM domain and subdomain based upon phandle args 2959 * provided and adds the subdomain to the parent PM domain. Returns a 2960 * negative error code on failure. 2961 */ 2962int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec, 2963 const struct of_phandle_args *subdomain_spec) 2964{ 2965 struct generic_pm_domain *parent, *subdomain; 2966 int ret; 2967 2968 mutex_lock(&gpd_list_lock); 2969 2970 parent = genpd_get_from_provider(parent_spec); 2971 if (IS_ERR(parent)) { 2972 ret = PTR_ERR(parent); 2973 goto out; 2974 } 2975 2976 subdomain = genpd_get_from_provider(subdomain_spec); 2977 if (IS_ERR(subdomain)) { 2978 ret = PTR_ERR(subdomain); 2979 goto out; 2980 } 2981 2982 ret = genpd_add_subdomain(parent, subdomain); 2983 2984out: 2985 mutex_unlock(&gpd_list_lock); 2986 2987 return ret == -ENOENT ? -EPROBE_DEFER : ret; 2988} 2989EXPORT_SYMBOL_GPL(of_genpd_add_subdomain); 2990 2991/** 2992 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. 2993 * @parent_spec: OF phandle args to use for parent PM domain look-up 2994 * @subdomain_spec: OF phandle args to use for subdomain look-up 2995 * 2996 * Looks-up a parent PM domain and subdomain based upon phandle args 2997 * provided and removes the subdomain from the parent PM domain. Returns a 2998 * negative error code on failure. 2999 */ 3000int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec, 3001 const struct of_phandle_args *subdomain_spec) 3002{ 3003 struct generic_pm_domain *parent, *subdomain; 3004 int ret; 3005 3006 mutex_lock(&gpd_list_lock); 3007 3008 parent = genpd_get_from_provider(parent_spec); 3009 if (IS_ERR(parent)) { 3010 ret = PTR_ERR(parent); 3011 goto out; 3012 } 3013 3014 subdomain = genpd_get_from_provider(subdomain_spec); 3015 if (IS_ERR(subdomain)) { 3016 ret = PTR_ERR(subdomain); 3017 goto out; 3018 } 3019 3020 ret = pm_genpd_remove_subdomain(parent, subdomain); 3021 3022out: 3023 mutex_unlock(&gpd_list_lock); 3024 3025 return ret; 3026} 3027EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain); 3028 3029/** 3030 * of_genpd_remove_last - Remove the last PM domain registered for a provider 3031 * @np: Pointer to device node associated with provider 3032 * 3033 * Find the last PM domain that was added by a particular provider and 3034 * remove this PM domain from the list of PM domains. The provider is 3035 * identified by the 'provider' device structure that is passed. The PM 3036 * domain will only be removed, if the provider associated with domain 3037 * has been removed. 3038 * 3039 * Returns a valid pointer to struct generic_pm_domain on success or 3040 * ERR_PTR() on failure. 3041 */ 3042struct generic_pm_domain *of_genpd_remove_last(struct device_node *np) 3043{ 3044 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT); 3045 int ret; 3046 3047 if (IS_ERR_OR_NULL(np)) 3048 return ERR_PTR(-EINVAL); 3049 3050 mutex_lock(&gpd_list_lock); 3051 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) { 3052 if (gpd->provider == of_fwnode_handle(np)) { 3053 ret = genpd_remove(gpd); 3054 genpd = ret ? ERR_PTR(ret) : gpd; 3055 break; 3056 } 3057 } 3058 mutex_unlock(&gpd_list_lock); 3059 3060 return genpd; 3061} 3062EXPORT_SYMBOL_GPL(of_genpd_remove_last); 3063 3064static void genpd_release_dev(struct device *dev) 3065{ 3066 of_node_put(dev->of_node); 3067 kfree(dev); 3068} 3069 3070static const struct bus_type genpd_bus_type = { 3071 .name = "genpd", 3072}; 3073 3074/** 3075 * genpd_dev_pm_detach - Detach a device from its PM domain. 3076 * @dev: Device to detach. 3077 * @power_off: Currently not used 3078 * 3079 * Try to locate a corresponding generic PM domain, which the device was 3080 * attached to previously. If such is found, the device is detached from it. 3081 */ 3082static void genpd_dev_pm_detach(struct device *dev, bool power_off) 3083{ 3084 struct generic_pm_domain *pd; 3085 unsigned int i; 3086 int ret = 0; 3087 3088 pd = dev_to_genpd(dev); 3089 if (IS_ERR(pd)) 3090 return; 3091 3092 dev_dbg(dev, "removing from PM domain %s\n", pd->name); 3093 3094 /* Drop the default performance state */ 3095 if (dev_gpd_data(dev)->default_pstate) { 3096 dev_pm_genpd_set_performance_state(dev, 0); 3097 dev_gpd_data(dev)->default_pstate = 0; 3098 } 3099 3100 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) { 3101 ret = genpd_remove_device(pd, dev); 3102 if (ret != -EAGAIN) 3103 break; 3104 3105 mdelay(i); 3106 cond_resched(); 3107 } 3108 3109 if (ret < 0) { 3110 dev_err(dev, "failed to remove from PM domain %s: %d", 3111 pd->name, ret); 3112 return; 3113 } 3114 3115 /* Check if PM domain can be powered off after removing this device. */ 3116 genpd_queue_power_off_work(pd); 3117 3118 /* Unregister the device if it was created by genpd. */ 3119 if (dev->bus == &genpd_bus_type) 3120 device_unregister(dev); 3121} 3122 3123static void genpd_dev_pm_sync(struct device *dev) 3124{ 3125 struct generic_pm_domain *pd; 3126 3127 pd = dev_to_genpd(dev); 3128 if (IS_ERR(pd)) 3129 return; 3130 3131 genpd_queue_power_off_work(pd); 3132} 3133 3134static int genpd_set_required_opp_dev(struct device *dev, 3135 struct device *base_dev) 3136{ 3137 struct dev_pm_opp_config config = { 3138 .required_dev = dev, 3139 }; 3140 int ret; 3141 3142 /* Limit support to non-providers for now. */ 3143 if (of_property_present(base_dev->of_node, "#power-domain-cells")) 3144 return 0; 3145 3146 if (!dev_pm_opp_of_has_required_opp(base_dev)) 3147 return 0; 3148 3149 ret = dev_pm_opp_set_config(base_dev, &config); 3150 if (ret < 0) 3151 return ret; 3152 3153 dev_gpd_data(dev)->opp_token = ret; 3154 return 0; 3155} 3156 3157static int genpd_set_required_opp(struct device *dev, unsigned int index) 3158{ 3159 int ret, pstate; 3160 3161 /* Set the default performance state */ 3162 pstate = of_get_required_opp_performance_state(dev->of_node, index); 3163 if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) { 3164 ret = pstate; 3165 goto err; 3166 } else if (pstate > 0) { 3167 ret = dev_pm_genpd_set_performance_state(dev, pstate); 3168 if (ret) 3169 goto err; 3170 dev_gpd_data(dev)->default_pstate = pstate; 3171 } 3172 3173 return 0; 3174err: 3175 dev_err(dev, "failed to set required performance state for power-domain %s: %d\n", 3176 dev_to_genpd(dev)->name, ret); 3177 return ret; 3178} 3179 3180static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev, 3181 unsigned int index, unsigned int num_domains, 3182 bool power_on) 3183{ 3184 struct of_phandle_args pd_args; 3185 struct generic_pm_domain *pd; 3186 int ret; 3187 3188 ret = of_parse_phandle_with_args(dev->of_node, "power-domains", 3189 "#power-domain-cells", index, &pd_args); 3190 if (ret < 0) 3191 return ret; 3192 3193 mutex_lock(&gpd_list_lock); 3194 pd = genpd_get_from_provider(&pd_args); 3195 of_node_put(pd_args.np); 3196 if (IS_ERR(pd)) { 3197 mutex_unlock(&gpd_list_lock); 3198 dev_dbg(dev, "%s() failed to find PM domain: %ld\n", 3199 __func__, PTR_ERR(pd)); 3200 return driver_deferred_probe_check_state(base_dev); 3201 } 3202 3203 dev_dbg(dev, "adding to PM domain %s\n", pd->name); 3204 3205 ret = genpd_add_device(pd, dev, base_dev); 3206 mutex_unlock(&gpd_list_lock); 3207 3208 if (ret < 0) 3209 return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name); 3210 3211 dev->pm_domain->detach = genpd_dev_pm_detach; 3212 dev->pm_domain->sync = genpd_dev_pm_sync; 3213 3214 /* 3215 * For a single PM domain the index of the required OPP must be zero, so 3216 * let's try to assign a required dev in that case. In the multiple PM 3217 * domains case, we need platform code to specify the index. 3218 */ 3219 if (num_domains == 1) { 3220 ret = genpd_set_required_opp_dev(dev, base_dev); 3221 if (ret) 3222 goto err; 3223 } 3224 3225 ret = genpd_set_required_opp(dev, index); 3226 if (ret) 3227 goto err; 3228 3229 if (power_on) { 3230 genpd_lock(pd); 3231 ret = genpd_power_on(pd, 0); 3232 genpd_unlock(pd); 3233 } 3234 3235 if (ret) { 3236 /* Drop the default performance state */ 3237 if (dev_gpd_data(dev)->default_pstate) { 3238 dev_pm_genpd_set_performance_state(dev, 0); 3239 dev_gpd_data(dev)->default_pstate = 0; 3240 } 3241 3242 genpd_remove_device(pd, dev); 3243 return -EPROBE_DEFER; 3244 } 3245 3246 return 1; 3247 3248err: 3249 genpd_remove_device(pd, dev); 3250 return ret; 3251} 3252 3253/** 3254 * genpd_dev_pm_attach - Attach a device to its PM domain using DT. 3255 * @dev: Device to attach. 3256 * 3257 * Parse device's OF node to find a PM domain specifier. If such is found, 3258 * attaches the device to retrieved pm_domain ops. 3259 * 3260 * Returns 1 on successfully attached PM domain, 0 when the device don't need a 3261 * PM domain or when multiple power-domains exists for it, else a negative error 3262 * code. Note that if a power-domain exists for the device, but it cannot be 3263 * found or turned on, then return -EPROBE_DEFER to ensure that the device is 3264 * not probed and to re-try again later. 3265 */ 3266int genpd_dev_pm_attach(struct device *dev) 3267{ 3268 if (!dev->of_node) 3269 return 0; 3270 3271 /* 3272 * Devices with multiple PM domains must be attached separately, as we 3273 * can only attach one PM domain per device. 3274 */ 3275 if (of_count_phandle_with_args(dev->of_node, "power-domains", 3276 "#power-domain-cells") != 1) 3277 return 0; 3278 3279 return __genpd_dev_pm_attach(dev, dev, 0, 1, true); 3280} 3281EXPORT_SYMBOL_GPL(genpd_dev_pm_attach); 3282 3283/** 3284 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains. 3285 * @dev: The device used to lookup the PM domain. 3286 * @index: The index of the PM domain. 3287 * 3288 * Parse device's OF node to find a PM domain specifier at the provided @index. 3289 * If such is found, creates a virtual device and attaches it to the retrieved 3290 * pm_domain ops. To deal with detaching of the virtual device, the ->detach() 3291 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach(). 3292 * 3293 * Returns the created virtual device if successfully attached PM domain, NULL 3294 * when the device don't need a PM domain, else an ERR_PTR() in case of 3295 * failures. If a power-domain exists for the device, but cannot be found or 3296 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device 3297 * is not probed and to re-try again later. 3298 */ 3299struct device *genpd_dev_pm_attach_by_id(struct device *dev, 3300 unsigned int index) 3301{ 3302 struct device *virt_dev; 3303 int num_domains; 3304 int ret; 3305 3306 if (!dev->of_node) 3307 return NULL; 3308 3309 /* Verify that the index is within a valid range. */ 3310 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains", 3311 "#power-domain-cells"); 3312 if (num_domains < 0 || index >= num_domains) 3313 return NULL; 3314 3315 if (!genpd_bus_registered) 3316 return ERR_PTR(-ENODEV); 3317 3318 /* Allocate and register device on the genpd bus. */ 3319 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL); 3320 if (!virt_dev) 3321 return ERR_PTR(-ENOMEM); 3322 3323 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev)); 3324 virt_dev->bus = &genpd_bus_type; 3325 virt_dev->release = genpd_release_dev; 3326 virt_dev->of_node = of_node_get(dev->of_node); 3327 3328 ret = device_register(virt_dev); 3329 if (ret) { 3330 put_device(virt_dev); 3331 return ERR_PTR(ret); 3332 } 3333 3334 /* Try to attach the device to the PM domain at the specified index. */ 3335 ret = __genpd_dev_pm_attach(virt_dev, dev, index, num_domains, false); 3336 if (ret < 1) { 3337 device_unregister(virt_dev); 3338 return ret ? ERR_PTR(ret) : NULL; 3339 } 3340 3341 pm_runtime_enable(virt_dev); 3342 genpd_queue_power_off_work(dev_to_genpd(virt_dev)); 3343 3344 return virt_dev; 3345} 3346EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id); 3347 3348/** 3349 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains. 3350 * @dev: The device used to lookup the PM domain. 3351 * @name: The name of the PM domain. 3352 * 3353 * Parse device's OF node to find a PM domain specifier using the 3354 * power-domain-names DT property. For further description see 3355 * genpd_dev_pm_attach_by_id(). 3356 */ 3357struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name) 3358{ 3359 int index; 3360 3361 if (!dev->of_node) 3362 return NULL; 3363 3364 index = of_property_match_string(dev->of_node, "power-domain-names", 3365 name); 3366 if (index < 0) 3367 return NULL; 3368 3369 return genpd_dev_pm_attach_by_id(dev, index); 3370} 3371 3372static const struct of_device_id idle_state_match[] = { 3373 { .compatible = "domain-idle-state", }, 3374 { } 3375}; 3376 3377static int genpd_parse_state(struct genpd_power_state *genpd_state, 3378 struct device_node *state_node) 3379{ 3380 int err; 3381 u32 residency; 3382 u32 entry_latency, exit_latency; 3383 3384 err = of_property_read_u32(state_node, "entry-latency-us", 3385 &entry_latency); 3386 if (err) { 3387 pr_debug(" * %pOF missing entry-latency-us property\n", 3388 state_node); 3389 return -EINVAL; 3390 } 3391 3392 err = of_property_read_u32(state_node, "exit-latency-us", 3393 &exit_latency); 3394 if (err) { 3395 pr_debug(" * %pOF missing exit-latency-us property\n", 3396 state_node); 3397 return -EINVAL; 3398 } 3399 3400 err = of_property_read_u32(state_node, "min-residency-us", &residency); 3401 if (!err) 3402 genpd_state->residency_ns = 1000LL * residency; 3403 3404 of_property_read_string(state_node, "idle-state-name", &genpd_state->name); 3405 3406 genpd_state->power_on_latency_ns = 1000LL * exit_latency; 3407 genpd_state->power_off_latency_ns = 1000LL * entry_latency; 3408 genpd_state->fwnode = of_fwnode_handle(state_node); 3409 3410 return 0; 3411} 3412 3413static int genpd_iterate_idle_states(struct device_node *dn, 3414 struct genpd_power_state *states) 3415{ 3416 int ret; 3417 struct of_phandle_iterator it; 3418 struct device_node *np; 3419 int i = 0; 3420 3421 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL); 3422 if (ret <= 0) 3423 return ret == -ENOENT ? 0 : ret; 3424 3425 /* Loop over the phandles until all the requested entry is found */ 3426 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) { 3427 np = it.node; 3428 if (!of_match_node(idle_state_match, np)) 3429 continue; 3430 3431 if (!of_device_is_available(np)) 3432 continue; 3433 3434 if (states) { 3435 ret = genpd_parse_state(&states[i], np); 3436 if (ret) { 3437 pr_err("Parsing idle state node %pOF failed with err %d\n", 3438 np, ret); 3439 of_node_put(np); 3440 return ret; 3441 } 3442 } 3443 i++; 3444 } 3445 3446 return i; 3447} 3448 3449/** 3450 * of_genpd_parse_idle_states: Return array of idle states for the genpd. 3451 * 3452 * @dn: The genpd device node 3453 * @states: The pointer to which the state array will be saved. 3454 * @n: The count of elements in the array returned from this function. 3455 * 3456 * Returns the device states parsed from the OF node. The memory for the states 3457 * is allocated by this function and is the responsibility of the caller to 3458 * free the memory after use. If any or zero compatible domain idle states is 3459 * found it returns 0 and in case of errors, a negative error code is returned. 3460 */ 3461int of_genpd_parse_idle_states(struct device_node *dn, 3462 struct genpd_power_state **states, int *n) 3463{ 3464 struct genpd_power_state *st; 3465 int ret; 3466 3467 ret = genpd_iterate_idle_states(dn, NULL); 3468 if (ret < 0) 3469 return ret; 3470 3471 if (!ret) { 3472 *states = NULL; 3473 *n = 0; 3474 return 0; 3475 } 3476 3477 st = kcalloc(ret, sizeof(*st), GFP_KERNEL); 3478 if (!st) 3479 return -ENOMEM; 3480 3481 ret = genpd_iterate_idle_states(dn, st); 3482 if (ret <= 0) { 3483 kfree(st); 3484 return ret < 0 ? ret : -EINVAL; 3485 } 3486 3487 *states = st; 3488 *n = ret; 3489 3490 return 0; 3491} 3492EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states); 3493 3494/** 3495 * of_genpd_sync_state() - A common sync_state function for genpd providers 3496 * @np: The device node the genpd provider is associated with. 3497 * 3498 * The @np that corresponds to a genpd provider may provide one or multiple 3499 * genpds. This function makes use @np to find the genpds that belongs to the 3500 * provider. For each genpd we try a power-off. 3501 */ 3502void of_genpd_sync_state(struct device_node *np) 3503{ 3504 struct generic_pm_domain *genpd; 3505 3506 if (!np) 3507 return; 3508 3509 mutex_lock(&gpd_list_lock); 3510 list_for_each_entry(genpd, &gpd_list, gpd_list_node) { 3511 if (genpd->provider == of_fwnode_handle(np)) { 3512 genpd_lock(genpd); 3513 genpd->stay_on = false; 3514 genpd_power_off(genpd, false, 0); 3515 genpd_unlock(genpd); 3516 } 3517 } 3518 mutex_unlock(&gpd_list_lock); 3519} 3520EXPORT_SYMBOL_GPL(of_genpd_sync_state); 3521 3522static int genpd_provider_probe(struct device *dev) 3523{ 3524 return 0; 3525} 3526 3527static void genpd_provider_sync_state(struct device *dev) 3528{ 3529 struct generic_pm_domain *genpd = container_of(dev, struct generic_pm_domain, dev); 3530 3531 switch (genpd->sync_state) { 3532 case GENPD_SYNC_STATE_OFF: 3533 break; 3534 3535 case GENPD_SYNC_STATE_ONECELL: 3536 of_genpd_sync_state(dev->of_node); 3537 break; 3538 3539 case GENPD_SYNC_STATE_SIMPLE: 3540 genpd_lock(genpd); 3541 genpd->stay_on = false; 3542 genpd_power_off(genpd, false, 0); 3543 genpd_unlock(genpd); 3544 break; 3545 3546 default: 3547 break; 3548 } 3549} 3550 3551static struct device_driver genpd_provider_drv = { 3552 .name = "genpd_provider", 3553 .bus = &genpd_provider_bus_type, 3554 .probe = genpd_provider_probe, 3555 .sync_state = genpd_provider_sync_state, 3556 .suppress_bind_attrs = true, 3557}; 3558 3559static int __init genpd_bus_init(void) 3560{ 3561 int ret; 3562 3563 ret = device_register(&genpd_provider_bus); 3564 if (ret) { 3565 put_device(&genpd_provider_bus); 3566 return ret; 3567 } 3568 3569 ret = bus_register(&genpd_provider_bus_type); 3570 if (ret) 3571 goto err_dev; 3572 3573 ret = bus_register(&genpd_bus_type); 3574 if (ret) 3575 goto err_prov_bus; 3576 3577 ret = driver_register(&genpd_provider_drv); 3578 if (ret) 3579 goto err_bus; 3580 3581 genpd_bus_registered = true; 3582 return 0; 3583 3584err_bus: 3585 bus_unregister(&genpd_bus_type); 3586err_prov_bus: 3587 bus_unregister(&genpd_provider_bus_type); 3588err_dev: 3589 device_unregister(&genpd_provider_bus); 3590 return ret; 3591} 3592core_initcall(genpd_bus_init); 3593 3594#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */ 3595 3596 3597/*** debugfs support ***/ 3598 3599#ifdef CONFIG_DEBUG_FS 3600/* 3601 * TODO: This function is a slightly modified version of rtpm_status_show 3602 * from sysfs.c, so generalize it. 3603 */ 3604static void rtpm_status_str(struct seq_file *s, struct device *dev) 3605{ 3606 static const char * const status_lookup[] = { 3607 [RPM_ACTIVE] = "active", 3608 [RPM_RESUMING] = "resuming", 3609 [RPM_SUSPENDED] = "suspended", 3610 [RPM_SUSPENDING] = "suspending" 3611 }; 3612 const char *p = ""; 3613 3614 if (dev->power.runtime_error) 3615 p = "error"; 3616 else if (dev->power.disable_depth) 3617 p = "unsupported"; 3618 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup)) 3619 p = status_lookup[dev->power.runtime_status]; 3620 else 3621 WARN_ON(1); 3622 3623 seq_printf(s, "%-26s ", p); 3624} 3625 3626static void perf_status_str(struct seq_file *s, struct device *dev) 3627{ 3628 struct generic_pm_domain_data *gpd_data; 3629 3630 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 3631 3632 seq_printf(s, "%-10u ", gpd_data->performance_state); 3633} 3634 3635static void mode_status_str(struct seq_file *s, struct device *dev) 3636{ 3637 struct generic_pm_domain_data *gpd_data; 3638 3639 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); 3640 3641 seq_printf(s, "%2s", gpd_data->hw_mode ? "HW" : "SW"); 3642} 3643 3644static int genpd_summary_one(struct seq_file *s, 3645 struct generic_pm_domain *genpd) 3646{ 3647 static const char * const status_lookup[] = { 3648 [GENPD_STATE_ON] = "on", 3649 [GENPD_STATE_OFF] = "off" 3650 }; 3651 struct pm_domain_data *pm_data; 3652 struct gpd_link *link; 3653 char state[16]; 3654 int ret; 3655 3656 ret = genpd_lock_interruptible(genpd); 3657 if (ret) 3658 return -ERESTARTSYS; 3659 3660 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup))) 3661 goto exit; 3662 if (!genpd_status_on(genpd)) 3663 snprintf(state, sizeof(state), "%s-%u", 3664 status_lookup[genpd->status], genpd->state_idx); 3665 else 3666 snprintf(state, sizeof(state), "%s", 3667 status_lookup[genpd->status]); 3668 seq_printf(s, "%-30s %-30s %u", dev_name(&genpd->dev), state, genpd->performance_state); 3669 3670 /* 3671 * Modifications on the list require holding locks on both 3672 * parent and child, so we are safe. 3673 * Also the device name is immutable. 3674 */ 3675 list_for_each_entry(link, &genpd->parent_links, parent_node) { 3676 if (list_is_first(&link->parent_node, &genpd->parent_links)) 3677 seq_printf(s, "\n%48s", " "); 3678 seq_printf(s, "%s", link->child->name); 3679 if (!list_is_last(&link->parent_node, &genpd->parent_links)) 3680 seq_puts(s, ", "); 3681 } 3682 3683 list_for_each_entry(pm_data, &genpd->dev_list, list_node) { 3684 seq_printf(s, "\n %-30s ", dev_name(pm_data->dev)); 3685 rtpm_status_str(s, pm_data->dev); 3686 perf_status_str(s, pm_data->dev); 3687 mode_status_str(s, pm_data->dev); 3688 } 3689 3690 seq_puts(s, "\n"); 3691exit: 3692 genpd_unlock(genpd); 3693 3694 return 0; 3695} 3696 3697static int summary_show(struct seq_file *s, void *data) 3698{ 3699 struct generic_pm_domain *genpd; 3700 int ret = 0; 3701 3702 seq_puts(s, "domain status children performance\n"); 3703 seq_puts(s, " /device runtime status managed by\n"); 3704 seq_puts(s, "------------------------------------------------------------------------------\n"); 3705 3706 ret = mutex_lock_interruptible(&gpd_list_lock); 3707 if (ret) 3708 return -ERESTARTSYS; 3709 3710 list_for_each_entry(genpd, &gpd_list, gpd_list_node) { 3711 ret = genpd_summary_one(s, genpd); 3712 if (ret) 3713 break; 3714 } 3715 mutex_unlock(&gpd_list_lock); 3716 3717 return ret; 3718} 3719 3720static int status_show(struct seq_file *s, void *data) 3721{ 3722 static const char * const status_lookup[] = { 3723 [GENPD_STATE_ON] = "on", 3724 [GENPD_STATE_OFF] = "off" 3725 }; 3726 3727 struct generic_pm_domain *genpd = s->private; 3728 int ret = 0; 3729 3730 ret = genpd_lock_interruptible(genpd); 3731 if (ret) 3732 return -ERESTARTSYS; 3733 3734 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup))) 3735 goto exit; 3736 3737 if (genpd->status == GENPD_STATE_OFF) 3738 seq_printf(s, "%s-%u\n", status_lookup[genpd->status], 3739 genpd->state_idx); 3740 else 3741 seq_printf(s, "%s\n", status_lookup[genpd->status]); 3742exit: 3743 genpd_unlock(genpd); 3744 return ret; 3745} 3746 3747static int sub_domains_show(struct seq_file *s, void *data) 3748{ 3749 struct generic_pm_domain *genpd = s->private; 3750 struct gpd_link *link; 3751 int ret = 0; 3752 3753 ret = genpd_lock_interruptible(genpd); 3754 if (ret) 3755 return -ERESTARTSYS; 3756 3757 list_for_each_entry(link, &genpd->parent_links, parent_node) 3758 seq_printf(s, "%s\n", link->child->name); 3759 3760 genpd_unlock(genpd); 3761 return ret; 3762} 3763 3764static int idle_states_show(struct seq_file *s, void *data) 3765{ 3766 struct generic_pm_domain *genpd = s->private; 3767 u64 now, delta, idle_time = 0; 3768 unsigned int i; 3769 int ret = 0; 3770 3771 ret = genpd_lock_interruptible(genpd); 3772 if (ret) 3773 return -ERESTARTSYS; 3774 3775 seq_puts(s, "State Time Spent(ms) Usage Rejected Above Below\n"); 3776 3777 for (i = 0; i < genpd->state_count; i++) { 3778 struct genpd_power_state *state = &genpd->states[i]; 3779 char state_name[15]; 3780 3781 idle_time += state->idle_time; 3782 3783 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { 3784 now = ktime_get_mono_fast_ns(); 3785 if (now > genpd->accounting_time) { 3786 delta = now - genpd->accounting_time; 3787 idle_time += delta; 3788 } 3789 } 3790 3791 if (!state->name) 3792 snprintf(state_name, ARRAY_SIZE(state_name), "S%-13d", i); 3793 3794 do_div(idle_time, NSEC_PER_MSEC); 3795 seq_printf(s, "%-14s %-14llu %-10llu %-10llu %-10llu %llu\n", 3796 state->name ?: state_name, idle_time, 3797 state->usage, state->rejected, state->above, 3798 state->below); 3799 } 3800 3801 genpd_unlock(genpd); 3802 return ret; 3803} 3804 3805static int active_time_show(struct seq_file *s, void *data) 3806{ 3807 struct generic_pm_domain *genpd = s->private; 3808 u64 now, on_time, delta = 0; 3809 int ret = 0; 3810 3811 ret = genpd_lock_interruptible(genpd); 3812 if (ret) 3813 return -ERESTARTSYS; 3814 3815 if (genpd->status == GENPD_STATE_ON) { 3816 now = ktime_get_mono_fast_ns(); 3817 if (now > genpd->accounting_time) 3818 delta = now - genpd->accounting_time; 3819 } 3820 3821 on_time = genpd->on_time + delta; 3822 do_div(on_time, NSEC_PER_MSEC); 3823 seq_printf(s, "%llu ms\n", on_time); 3824 3825 genpd_unlock(genpd); 3826 return ret; 3827} 3828 3829static int total_idle_time_show(struct seq_file *s, void *data) 3830{ 3831 struct generic_pm_domain *genpd = s->private; 3832 u64 now, delta, total = 0; 3833 unsigned int i; 3834 int ret = 0; 3835 3836 ret = genpd_lock_interruptible(genpd); 3837 if (ret) 3838 return -ERESTARTSYS; 3839 3840 for (i = 0; i < genpd->state_count; i++) { 3841 total += genpd->states[i].idle_time; 3842 3843 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) { 3844 now = ktime_get_mono_fast_ns(); 3845 if (now > genpd->accounting_time) { 3846 delta = now - genpd->accounting_time; 3847 total += delta; 3848 } 3849 } 3850 } 3851 3852 do_div(total, NSEC_PER_MSEC); 3853 seq_printf(s, "%llu ms\n", total); 3854 3855 genpd_unlock(genpd); 3856 return ret; 3857} 3858 3859 3860static int devices_show(struct seq_file *s, void *data) 3861{ 3862 struct generic_pm_domain *genpd = s->private; 3863 struct pm_domain_data *pm_data; 3864 int ret = 0; 3865 3866 ret = genpd_lock_interruptible(genpd); 3867 if (ret) 3868 return -ERESTARTSYS; 3869 3870 list_for_each_entry(pm_data, &genpd->dev_list, list_node) 3871 seq_printf(s, "%s\n", dev_name(pm_data->dev)); 3872 3873 genpd_unlock(genpd); 3874 return ret; 3875} 3876 3877static int perf_state_show(struct seq_file *s, void *data) 3878{ 3879 struct generic_pm_domain *genpd = s->private; 3880 3881 if (genpd_lock_interruptible(genpd)) 3882 return -ERESTARTSYS; 3883 3884 seq_printf(s, "%u\n", genpd->performance_state); 3885 3886 genpd_unlock(genpd); 3887 return 0; 3888} 3889 3890DEFINE_SHOW_ATTRIBUTE(summary); 3891DEFINE_SHOW_ATTRIBUTE(status); 3892DEFINE_SHOW_ATTRIBUTE(sub_domains); 3893DEFINE_SHOW_ATTRIBUTE(idle_states); 3894DEFINE_SHOW_ATTRIBUTE(active_time); 3895DEFINE_SHOW_ATTRIBUTE(total_idle_time); 3896DEFINE_SHOW_ATTRIBUTE(devices); 3897DEFINE_SHOW_ATTRIBUTE(perf_state); 3898 3899static void genpd_debug_add(struct generic_pm_domain *genpd) 3900{ 3901 struct dentry *d; 3902 3903 if (!genpd_debugfs_dir) 3904 return; 3905 3906 d = debugfs_create_dir(dev_name(&genpd->dev), genpd_debugfs_dir); 3907 3908 debugfs_create_file("current_state", 0444, 3909 d, genpd, &status_fops); 3910 debugfs_create_file("sub_domains", 0444, 3911 d, genpd, &sub_domains_fops); 3912 debugfs_create_file("idle_states", 0444, 3913 d, genpd, &idle_states_fops); 3914 debugfs_create_file("active_time", 0444, 3915 d, genpd, &active_time_fops); 3916 debugfs_create_file("total_idle_time", 0444, 3917 d, genpd, &total_idle_time_fops); 3918 debugfs_create_file("devices", 0444, 3919 d, genpd, &devices_fops); 3920 if (genpd->set_performance_state) 3921 debugfs_create_file("perf_state", 0444, 3922 d, genpd, &perf_state_fops); 3923} 3924 3925static int __init genpd_debug_init(void) 3926{ 3927 struct generic_pm_domain *genpd; 3928 3929 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL); 3930 3931 debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir, 3932 NULL, &summary_fops); 3933 3934 list_for_each_entry(genpd, &gpd_list, gpd_list_node) 3935 genpd_debug_add(genpd); 3936 3937 return 0; 3938} 3939late_initcall(genpd_debug_init); 3940 3941static void __exit genpd_debug_exit(void) 3942{ 3943 debugfs_remove_recursive(genpd_debugfs_dir); 3944} 3945__exitcall(genpd_debug_exit); 3946#endif /* CONFIG_DEBUG_FS */
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