1/*
   2 * drivers/base/power/domain.c - Common code related to device power domains.
   3 *
   4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
   5 *
   6 * This file is released under the GPLv2.
   7 */
   8
   9#include <linux/delay.h>
  10#include <linux/kernel.h>
  11#include <linux/io.h>
  12#include <linux/platform_device.h>
  13#include <linux/pm_runtime.h>
  14#include <linux/pm_domain.h>
  15#include <linux/pm_qos.h>
  16#include <linux/pm_clock.h>
  17#include <linux/slab.h>
  18#include <linux/err.h>
  19#include <linux/sched.h>
  20#include <linux/suspend.h>
  21#include <linux/export.h>
  22
  23#include "power.h"
  24
  25#define GENPD_RETRY_MAX_MS	250		/* Approximate */
  26
  27#define GENPD_DEV_CALLBACK(genpd, type, callback, dev)		\
  28({								\
  29	type (*__routine)(struct device *__d); 			\
  30	type __ret = (type)0;					\
  31								\
  32	__routine = genpd->dev_ops.callback; 			\
  33	if (__routine) {					\
  34		__ret = __routine(dev); 			\
  35	}							\
  36	__ret;							\
  37})
  38
  39static LIST_HEAD(gpd_list);
  40static DEFINE_MUTEX(gpd_list_lock);
  41
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  42/*
  43 * Get the generic PM domain for a particular struct device.
  44 * This validates the struct device pointer, the PM domain pointer,
  45 * and checks that the PM domain pointer is a real generic PM domain.
  46 * Any failure results in NULL being returned.
  47 */
  48struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
  49{
  50	struct generic_pm_domain *genpd = NULL, *gpd;
  51
  52	if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
  53		return NULL;
  54
  55	mutex_lock(&gpd_list_lock);
  56	list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
  57		if (&gpd->domain == dev->pm_domain) {
  58			genpd = gpd;
  59			break;
  60		}
  61	}
  62	mutex_unlock(&gpd_list_lock);
  63
  64	return genpd;
  65}
  66
  67/*
  68 * This should only be used where we are certain that the pm_domain
  69 * attached to the device is a genpd domain.
  70 */
  71static struct generic_pm_domain *dev_to_genpd(struct device *dev)
  72{
  73	if (IS_ERR_OR_NULL(dev->pm_domain))
  74		return ERR_PTR(-EINVAL);
  75
  76	return pd_to_genpd(dev->pm_domain);
  77}
  78
  79static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
 
  80{
  81	return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
  82}
  83
  84static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
 
  85{
  86	return GENPD_DEV_CALLBACK(genpd, int, start, dev);
  87}
  88
  89static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
  90{
  91	bool ret = false;
  92
  93	if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
  94		ret = !!atomic_dec_and_test(&genpd->sd_count);
  95
  96	return ret;
  97}
  98
  99static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
 100{
 101	atomic_inc(&genpd->sd_count);
 102	smp_mb__after_atomic();
 103}
 104
 105static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 106{
 107	unsigned int state_idx = genpd->state_idx;
 108	ktime_t time_start;
 109	s64 elapsed_ns;
 110	int ret;
 111
 112	if (!genpd->power_on)
 113		return 0;
 114
 115	if (!timed)
 116		return genpd->power_on(genpd);
 117
 118	time_start = ktime_get();
 119	ret = genpd->power_on(genpd);
 120	if (ret)
 121		return ret;
 122
 123	elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 
 
 
 
 
 
 
 
 
 124	if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
 125		return ret;
 126
 127	genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
 128	genpd->max_off_time_changed = true;
 129	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
 130		 genpd->name, "on", elapsed_ns);
 131
 132	return ret;
 133}
 134
 135static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
 136{
 137	unsigned int state_idx = genpd->state_idx;
 138	ktime_t time_start;
 139	s64 elapsed_ns;
 140	int ret;
 141
 142	if (!genpd->power_off)
 143		return 0;
 144
 145	if (!timed)
 146		return genpd->power_off(genpd);
 147
 148	time_start = ktime_get();
 149	ret = genpd->power_off(genpd);
 150	if (ret == -EBUSY)
 151		return ret;
 152
 153	elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 154	if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
 155		return ret;
 156
 157	genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
 158	genpd->max_off_time_changed = true;
 159	pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
 160		 genpd->name, "off", elapsed_ns);
 161
 162	return ret;
 163}
 164
 165/**
 166 * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff().
 167 * @genpd: PM domain to power off.
 168 *
 169 * Queue up the execution of genpd_poweroff() unless it's already been done
 170 * before.
 171 */
 172static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
 173{
 174	queue_work(pm_wq, &genpd->power_off_work);
 175}
 176
 177/**
 178 * genpd_poweron - Restore power to a given PM domain and its masters.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 179 * @genpd: PM domain to power up.
 180 * @depth: nesting count for lockdep.
 181 *
 182 * Restore power to @genpd and all of its masters so that it is possible to
 183 * resume a device belonging to it.
 184 */
 185static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
 186{
 187	struct gpd_link *link;
 188	int ret = 0;
 189
 190	if (genpd->status == GPD_STATE_ACTIVE
 191	    || (genpd->prepared_count > 0 && genpd->suspend_power_off))
 192		return 0;
 193
 194	/*
 195	 * The list is guaranteed not to change while the loop below is being
 196	 * executed, unless one of the masters' .power_on() callbacks fiddles
 197	 * with it.
 198	 */
 199	list_for_each_entry(link, &genpd->slave_links, slave_node) {
 200		struct generic_pm_domain *master = link->master;
 201
 202		genpd_sd_counter_inc(master);
 203
 204		mutex_lock_nested(&master->lock, depth + 1);
 205		ret = genpd_poweron(master, depth + 1);
 206		mutex_unlock(&master->lock);
 207
 208		if (ret) {
 209			genpd_sd_counter_dec(master);
 210			goto err;
 211		}
 212	}
 213
 214	ret = genpd_power_on(genpd, true);
 215	if (ret)
 216		goto err;
 217
 218	genpd->status = GPD_STATE_ACTIVE;
 
 
 219	return 0;
 220
 221 err:
 222	list_for_each_entry_continue_reverse(link,
 223					&genpd->slave_links,
 224					slave_node) {
 225		genpd_sd_counter_dec(link->master);
 226		genpd_queue_power_off_work(link->master);
 
 
 227	}
 228
 229	return ret;
 230}
 231
 232static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
 233{
 234	return GENPD_DEV_CALLBACK(genpd, int, save_state, dev);
 235}
 236
 237static int genpd_restore_dev(struct generic_pm_domain *genpd,
 238			struct device *dev)
 239{
 240	return GENPD_DEV_CALLBACK(genpd, int, restore_state, dev);
 241}
 242
 243static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
 244				     unsigned long val, void *ptr)
 245{
 246	struct generic_pm_domain_data *gpd_data;
 247	struct device *dev;
 248
 249	gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
 250	dev = gpd_data->base.dev;
 251
 252	for (;;) {
 253		struct generic_pm_domain *genpd;
 254		struct pm_domain_data *pdd;
 255
 256		spin_lock_irq(&dev->power.lock);
 257
 258		pdd = dev->power.subsys_data ?
 259				dev->power.subsys_data->domain_data : NULL;
 260		if (pdd && pdd->dev) {
 261			to_gpd_data(pdd)->td.constraint_changed = true;
 262			genpd = dev_to_genpd(dev);
 263		} else {
 264			genpd = ERR_PTR(-ENODATA);
 265		}
 266
 267		spin_unlock_irq(&dev->power.lock);
 268
 269		if (!IS_ERR(genpd)) {
 270			mutex_lock(&genpd->lock);
 271			genpd->max_off_time_changed = true;
 272			mutex_unlock(&genpd->lock);
 273		}
 274
 275		dev = dev->parent;
 276		if (!dev || dev->power.ignore_children)
 277			break;
 278	}
 279
 280	return NOTIFY_DONE;
 281}
 282
 283/**
 284 * genpd_poweroff - Remove power from a given PM domain.
 285 * @genpd: PM domain to power down.
 286 * @is_async: PM domain is powered down from a scheduled work
 287 *
 288 * If all of the @genpd's devices have been suspended and all of its subdomains
 289 * have been powered down, remove power from @genpd.
 290 */
 291static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
 292{
 293	struct pm_domain_data *pdd;
 294	struct gpd_link *link;
 295	unsigned int not_suspended = 0;
 296
 297	/*
 298	 * Do not try to power off the domain in the following situations:
 299	 * (1) The domain is already in the "power off" state.
 300	 * (2) System suspend is in progress.
 301	 */
 302	if (genpd->status == GPD_STATE_POWER_OFF
 303	    || genpd->prepared_count > 0)
 304		return 0;
 305
 306	if (atomic_read(&genpd->sd_count) > 0)
 307		return -EBUSY;
 308
 309	list_for_each_entry(pdd, &genpd->dev_list, list_node) {
 310		enum pm_qos_flags_status stat;
 311
 312		stat = dev_pm_qos_flags(pdd->dev,
 313					PM_QOS_FLAG_NO_POWER_OFF
 314						| PM_QOS_FLAG_REMOTE_WAKEUP);
 315		if (stat > PM_QOS_FLAGS_NONE)
 316			return -EBUSY;
 317
 318		if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
 319			not_suspended++;
 320	}
 321
 322	if (not_suspended > 1 || (not_suspended == 1 && is_async))
 323		return -EBUSY;
 324
 325	if (genpd->gov && genpd->gov->power_down_ok) {
 326		if (!genpd->gov->power_down_ok(&genpd->domain))
 327			return -EAGAIN;
 328	}
 329
 330	if (genpd->power_off) {
 331		int ret;
 332
 333		if (atomic_read(&genpd->sd_count) > 0)
 334			return -EBUSY;
 
 
 335
 336		/*
 337		 * If sd_count > 0 at this point, one of the subdomains hasn't
 338		 * managed to call genpd_poweron() for the master yet after
 339		 * incrementing it.  In that case genpd_poweron() will wait
 340		 * for us to drop the lock, so we can call .power_off() and let
 341		 * the genpd_poweron() restore power for us (this shouldn't
 342		 * happen very often).
 343		 */
 344		ret = genpd_power_off(genpd, true);
 345		if (ret)
 346			return ret;
 347	}
 348
 349	genpd->status = GPD_STATE_POWER_OFF;
 
 
 
 
 
 
 
 350
 351	list_for_each_entry(link, &genpd->slave_links, slave_node) {
 352		genpd_sd_counter_dec(link->master);
 353		genpd_queue_power_off_work(link->master);
 354	}
 355
 356	return 0;
 357}
 358
 359/**
 360 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
 361 * @work: Work structure used for scheduling the execution of this function.
 362 */
 363static void genpd_power_off_work_fn(struct work_struct *work)
 364{
 365	struct generic_pm_domain *genpd;
 366
 367	genpd = container_of(work, struct generic_pm_domain, power_off_work);
 
 
 
 
 
 
 
 
 
 
 368
 369	mutex_lock(&genpd->lock);
 370	genpd_poweroff(genpd, true);
 371	mutex_unlock(&genpd->lock);
 372}
 373
 374/**
 375 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
 376 * @dev: Device to suspend.
 377 *
 378 * Carry out a runtime suspend of a device under the assumption that its
 379 * pm_domain field points to the domain member of an object of type
 380 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
 381 */
 382static int pm_genpd_runtime_suspend(struct device *dev)
 383{
 384	struct generic_pm_domain *genpd;
 385	bool (*stop_ok)(struct device *__dev);
 386	struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
 387	bool runtime_pm = pm_runtime_enabled(dev);
 388	ktime_t time_start;
 389	s64 elapsed_ns;
 390	int ret;
 391
 392	dev_dbg(dev, "%s()\n", __func__);
 393
 394	genpd = dev_to_genpd(dev);
 395	if (IS_ERR(genpd))
 396		return -EINVAL;
 397
 398	/*
 399	 * A runtime PM centric subsystem/driver may re-use the runtime PM
 400	 * callbacks for other purposes than runtime PM. In those scenarios
 401	 * runtime PM is disabled. Under these circumstances, we shall skip
 402	 * validating/measuring the PM QoS latency.
 403	 */
 404	stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
 405	if (runtime_pm && stop_ok && !stop_ok(dev))
 406		return -EBUSY;
 407
 408	/* Measure suspend latency. */
 
 409	if (runtime_pm)
 410		time_start = ktime_get();
 411
 412	ret = genpd_save_dev(genpd, dev);
 413	if (ret)
 414		return ret;
 415
 416	ret = genpd_stop_dev(genpd, dev);
 417	if (ret) {
 418		genpd_restore_dev(genpd, dev);
 419		return ret;
 420	}
 421
 422	/* Update suspend latency value if the measured time exceeds it. */
 423	if (runtime_pm) {
 424		elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 425		if (elapsed_ns > td->suspend_latency_ns) {
 426			td->suspend_latency_ns = elapsed_ns;
 427			dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
 428				elapsed_ns);
 429			genpd->max_off_time_changed = true;
 430			td->constraint_changed = true;
 431		}
 432	}
 433
 434	/*
 435	 * If power.irq_safe is set, this routine will be run with interrupts
 436	 * off, so it can't use mutexes.
 437	 */
 438	if (dev->power.irq_safe)
 439		return 0;
 440
 441	mutex_lock(&genpd->lock);
 442	genpd_poweroff(genpd, false);
 443	mutex_unlock(&genpd->lock);
 444
 445	return 0;
 446}
 447
 448/**
 449 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
 450 * @dev: Device to resume.
 451 *
 452 * Carry out a runtime resume of a device under the assumption that its
 453 * pm_domain field points to the domain member of an object of type
 454 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
 455 */
 456static int pm_genpd_runtime_resume(struct device *dev)
 457{
 458	struct generic_pm_domain *genpd;
 459	struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
 460	bool runtime_pm = pm_runtime_enabled(dev);
 461	ktime_t time_start;
 462	s64 elapsed_ns;
 463	int ret;
 464	bool timed = true;
 465
 466	dev_dbg(dev, "%s()\n", __func__);
 467
 468	genpd = dev_to_genpd(dev);
 469	if (IS_ERR(genpd))
 470		return -EINVAL;
 471
 472	/* If power.irq_safe, the PM domain is never powered off. */
 473	if (dev->power.irq_safe) {
 
 
 
 474		timed = false;
 475		goto out;
 476	}
 477
 478	mutex_lock(&genpd->lock);
 479	ret = genpd_poweron(genpd, 0);
 480	mutex_unlock(&genpd->lock);
 481
 482	if (ret)
 483		return ret;
 484
 485 out:
 486	/* Measure resume latency. */
 
 487	if (timed && runtime_pm)
 488		time_start = ktime_get();
 489
 490	ret = genpd_start_dev(genpd, dev);
 491	if (ret)
 492		goto err_poweroff;
 493
 494	ret = genpd_restore_dev(genpd, dev);
 495	if (ret)
 496		goto err_stop;
 497
 498	/* Update resume latency value if the measured time exceeds it. */
 499	if (timed && runtime_pm) {
 500		elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
 501		if (elapsed_ns > td->resume_latency_ns) {
 502			td->resume_latency_ns = elapsed_ns;
 503			dev_dbg(dev, "resume latency exceeded, %lld ns\n",
 504				elapsed_ns);
 505			genpd->max_off_time_changed = true;
 506			td->constraint_changed = true;
 507		}
 508	}
 509
 510	return 0;
 511
 512err_stop:
 513	genpd_stop_dev(genpd, dev);
 514err_poweroff:
 515	if (!dev->power.irq_safe) {
 516		mutex_lock(&genpd->lock);
 517		genpd_poweroff(genpd, 0);
 518		mutex_unlock(&genpd->lock);
 
 519	}
 520
 521	return ret;
 522}
 523
 524static bool pd_ignore_unused;
 525static int __init pd_ignore_unused_setup(char *__unused)
 526{
 527	pd_ignore_unused = true;
 528	return 1;
 529}
 530__setup("pd_ignore_unused", pd_ignore_unused_setup);
 531
 532/**
 533 * genpd_poweroff_unused - Power off all PM domains with no devices in use.
 534 */
 535static int __init genpd_poweroff_unused(void)
 536{
 537	struct generic_pm_domain *genpd;
 538
 539	if (pd_ignore_unused) {
 540		pr_warn("genpd: Not disabling unused power domains\n");
 541		return 0;
 542	}
 543
 544	mutex_lock(&gpd_list_lock);
 545
 546	list_for_each_entry(genpd, &gpd_list, gpd_list_node)
 547		genpd_queue_power_off_work(genpd);
 548
 549	mutex_unlock(&gpd_list_lock);
 550
 551	return 0;
 552}
 553late_initcall(genpd_poweroff_unused);
 554
 555#ifdef CONFIG_PM_SLEEP
 556
 557/**
 558 * pm_genpd_present - Check if the given PM domain has been initialized.
 559 * @genpd: PM domain to check.
 560 */
 561static bool pm_genpd_present(const struct generic_pm_domain *genpd)
 562{
 563	const struct generic_pm_domain *gpd;
 564
 565	if (IS_ERR_OR_NULL(genpd))
 566		return false;
 567
 568	list_for_each_entry(gpd, &gpd_list, gpd_list_node)
 569		if (gpd == genpd)
 570			return true;
 571
 572	return false;
 573}
 574
 575static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
 576				    struct device *dev)
 577{
 578	return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
 579}
 580
 581/**
 582 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
 583 * @genpd: PM domain to power off, if possible.
 584 * @timed: True if latency measurements are allowed.
 
 585 *
 586 * Check if the given PM domain can be powered off (during system suspend or
 587 * hibernation) and do that if so.  Also, in that case propagate to its masters.
 588 *
 589 * This function is only called in "noirq" and "syscore" stages of system power
 590 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
 591 * executed sequentially, so it is guaranteed that it will never run twice in
 592 * parallel).
 593 */
 594static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd,
 595				   bool timed)
 596{
 597	struct gpd_link *link;
 598
 599	if (genpd->status == GPD_STATE_POWER_OFF)
 600		return;
 601
 602	if (genpd->suspended_count != genpd->device_count
 603	    || atomic_read(&genpd->sd_count) > 0)
 604		return;
 605
 606	/* Choose the deepest state when suspending */
 607	genpd->state_idx = genpd->state_count - 1;
 608	genpd_power_off(genpd, timed);
 
 609
 610	genpd->status = GPD_STATE_POWER_OFF;
 611
 612	list_for_each_entry(link, &genpd->slave_links, slave_node) {
 613		genpd_sd_counter_dec(link->master);
 614		pm_genpd_sync_poweroff(link->master, timed);
 
 
 
 
 
 
 
 615	}
 616}
 617
 618/**
 619 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
 620 * @genpd: PM domain to power on.
 621 * @timed: True if latency measurements are allowed.
 
 622 *
 623 * This function is only called in "noirq" and "syscore" stages of system power
 624 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
 625 * executed sequentially, so it is guaranteed that it will never run twice in
 626 * parallel).
 627 */
 628static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd,
 629				  bool timed)
 630{
 631	struct gpd_link *link;
 632
 633	if (genpd->status == GPD_STATE_ACTIVE)
 634		return;
 635
 636	list_for_each_entry(link, &genpd->slave_links, slave_node) {
 637		pm_genpd_sync_poweron(link->master, timed);
 638		genpd_sd_counter_inc(link->master);
 
 
 
 
 
 
 
 
 639	}
 640
 641	genpd_power_on(genpd, timed);
 642
 643	genpd->status = GPD_STATE_ACTIVE;
 644}
 645
 646/**
 647 * resume_needed - Check whether to resume a device before system suspend.
 648 * @dev: Device to check.
 649 * @genpd: PM domain the device belongs to.
 650 *
 651 * There are two cases in which a device that can wake up the system from sleep
 652 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
 653 * to wake up the system and it has to remain active for this purpose while the
 654 * system is in the sleep state and (2) if the device is not enabled to wake up
 655 * the system from sleep states and it generally doesn't generate wakeup signals
 656 * by itself (those signals are generated on its behalf by other parts of the
 657 * system).  In the latter case it may be necessary to reconfigure the device's
 658 * wakeup settings during system suspend, because it may have been set up to
 659 * signal remote wakeup from the system's working state as needed by runtime PM.
 660 * Return 'true' in either of the above cases.
 661 */
 662static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
 
 663{
 664	bool active_wakeup;
 665
 666	if (!device_can_wakeup(dev))
 667		return false;
 668
 669	active_wakeup = genpd_dev_active_wakeup(genpd, dev);
 670	return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
 671}
 672
 673/**
 674 * pm_genpd_prepare - Start power transition of a device in a PM domain.
 675 * @dev: Device to start the transition of.
 676 *
 677 * Start a power transition of a device (during a system-wide power transition)
 678 * under the assumption that its pm_domain field points to the domain member of
 679 * an object of type struct generic_pm_domain representing a PM domain
 680 * consisting of I/O devices.
 681 */
 682static int pm_genpd_prepare(struct device *dev)
 683{
 684	struct generic_pm_domain *genpd;
 685	int ret;
 686
 687	dev_dbg(dev, "%s()\n", __func__);
 688
 689	genpd = dev_to_genpd(dev);
 690	if (IS_ERR(genpd))
 691		return -EINVAL;
 692
 693	/*
 694	 * If a wakeup request is pending for the device, it should be woken up
 695	 * at this point and a system wakeup event should be reported if it's
 696	 * set up to wake up the system from sleep states.
 697	 */
 698	pm_runtime_get_noresume(dev);
 699	if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
 700		pm_wakeup_event(dev, 0);
 701
 702	if (pm_wakeup_pending()) {
 703		pm_runtime_put(dev);
 704		return -EBUSY;
 705	}
 706
 707	if (resume_needed(dev, genpd))
 708		pm_runtime_resume(dev);
 709
 710	mutex_lock(&genpd->lock);
 711
 712	if (genpd->prepared_count++ == 0) {
 713		genpd->suspended_count = 0;
 714		genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
 715	}
 716
 717	mutex_unlock(&genpd->lock);
 718
 719	if (genpd->suspend_power_off) {
 720		pm_runtime_put_noidle(dev);
 721		return 0;
 722	}
 723
 724	/*
 725	 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
 726	 * so genpd_poweron() will return immediately, but if the device
 727	 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
 728	 * to make it operational.
 729	 */
 730	pm_runtime_resume(dev);
 731	__pm_runtime_disable(dev, false);
 732
 733	ret = pm_generic_prepare(dev);
 734	if (ret) {
 735		mutex_lock(&genpd->lock);
 736
 737		if (--genpd->prepared_count == 0)
 738			genpd->suspend_power_off = false;
 739
 740		mutex_unlock(&genpd->lock);
 741		pm_runtime_enable(dev);
 742	}
 743
 744	pm_runtime_put(dev);
 745	return ret;
 746}
 747
 748/**
 749 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
 
 750 * @dev: Device to suspend.
 
 751 *
 752 * Suspend a device under the assumption that its pm_domain field points to the
 753 * domain member of an object of type struct generic_pm_domain representing
 754 * a PM domain consisting of I/O devices.
 755 */
 756static int pm_genpd_suspend(struct device *dev)
 757{
 758	struct generic_pm_domain *genpd;
 759
 760	dev_dbg(dev, "%s()\n", __func__);
 761
 762	genpd = dev_to_genpd(dev);
 763	if (IS_ERR(genpd))
 764		return -EINVAL;
 765
 766	return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
 767}
 
 
 
 
 768
 769/**
 770 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
 771 * @dev: Device to suspend.
 772 *
 773 * Carry out a late suspend of a device under the assumption that its
 774 * pm_domain field points to the domain member of an object of type
 775 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
 776 */
 777static int pm_genpd_suspend_late(struct device *dev)
 778{
 779	struct generic_pm_domain *genpd;
 780
 781	dev_dbg(dev, "%s()\n", __func__);
 
 
 
 
 
 
 
 
 
 
 782
 783	genpd = dev_to_genpd(dev);
 784	if (IS_ERR(genpd))
 785		return -EINVAL;
 
 786
 787	return genpd->suspend_power_off ? 0 : pm_generic_suspend_late(dev);
 788}
 789
 790/**
 791 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
 792 * @dev: Device to suspend.
 793 *
 794 * Stop the device and remove power from the domain if all devices in it have
 795 * been stopped.
 796 */
 797static int pm_genpd_suspend_noirq(struct device *dev)
 798{
 799	struct generic_pm_domain *genpd;
 800
 801	dev_dbg(dev, "%s()\n", __func__);
 802
 803	genpd = dev_to_genpd(dev);
 804	if (IS_ERR(genpd))
 805		return -EINVAL;
 806
 807	if (genpd->suspend_power_off
 808	    || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
 809		return 0;
 810
 811	genpd_stop_dev(genpd, dev);
 812
 813	/*
 814	 * Since all of the "noirq" callbacks are executed sequentially, it is
 815	 * guaranteed that this function will never run twice in parallel for
 816	 * the same PM domain, so it is not necessary to use locking here.
 817	 */
 818	genpd->suspended_count++;
 819	pm_genpd_sync_poweroff(genpd, true);
 820
 821	return 0;
 822}
 823
 824/**
 825 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
 826 * @dev: Device to resume.
 827 *
 828 * Restore power to the device's PM domain, if necessary, and start the device.
 829 */
 830static int pm_genpd_resume_noirq(struct device *dev)
 831{
 832	struct generic_pm_domain *genpd;
 
 833
 834	dev_dbg(dev, "%s()\n", __func__);
 835
 836	genpd = dev_to_genpd(dev);
 837	if (IS_ERR(genpd))
 838		return -EINVAL;
 839
 840	if (genpd->suspend_power_off
 841	    || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
 842		return 0;
 843
 844	/*
 845	 * Since all of the "noirq" callbacks are executed sequentially, it is
 846	 * guaranteed that this function will never run twice in parallel for
 847	 * the same PM domain, so it is not necessary to use locking here.
 848	 */
 849	pm_genpd_sync_poweron(genpd, true);
 850	genpd->suspended_count--;
 
 851
 852	return genpd_start_dev(genpd, dev);
 853}
 854
 855/**
 856 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
 857 * @dev: Device to resume.
 858 *
 859 * Carry out an early resume of a device under the assumption that its
 860 * pm_domain field points to the domain member of an object of type
 861 * struct generic_pm_domain representing a power domain consisting of I/O
 862 * devices.
 863 */
 864static int pm_genpd_resume_early(struct device *dev)
 865{
 866	struct generic_pm_domain *genpd;
 867
 868	dev_dbg(dev, "%s()\n", __func__);
 869
 870	genpd = dev_to_genpd(dev);
 871	if (IS_ERR(genpd))
 872		return -EINVAL;
 873
 874	return genpd->suspend_power_off ? 0 : pm_generic_resume_early(dev);
 875}
 876
 877/**
 878 * pm_genpd_resume - Resume of device in an I/O PM domain.
 879 * @dev: Device to resume.
 880 *
 881 * Resume a device under the assumption that its pm_domain field points to the
 882 * domain member of an object of type struct generic_pm_domain representing
 883 * a power domain consisting of I/O devices.
 884 */
 885static int pm_genpd_resume(struct device *dev)
 886{
 887	struct generic_pm_domain *genpd;
 888
 889	dev_dbg(dev, "%s()\n", __func__);
 890
 891	genpd = dev_to_genpd(dev);
 892	if (IS_ERR(genpd))
 893		return -EINVAL;
 894
 895	return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
 896}
 897
 898/**
 899 * pm_genpd_freeze - Freezing a device in an I/O PM domain.
 900 * @dev: Device to freeze.
 901 *
 902 * Freeze a device under the assumption that its pm_domain field points to the
 903 * domain member of an object of type struct generic_pm_domain representing
 904 * a power domain consisting of I/O devices.
 905 */
 906static int pm_genpd_freeze(struct device *dev)
 907{
 908	struct generic_pm_domain *genpd;
 909
 910	dev_dbg(dev, "%s()\n", __func__);
 911
 912	genpd = dev_to_genpd(dev);
 913	if (IS_ERR(genpd))
 914		return -EINVAL;
 915
 916	return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
 917}
 918
 919/**
 920 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
 921 * @dev: Device to freeze.
 922 *
 923 * Carry out a late freeze of a device under the assumption that its
 924 * pm_domain field points to the domain member of an object of type
 925 * struct generic_pm_domain representing a power domain consisting of I/O
 926 * devices.
 927 */
 928static int pm_genpd_freeze_late(struct device *dev)
 929{
 930	struct generic_pm_domain *genpd;
 
 931
 932	dev_dbg(dev, "%s()\n", __func__);
 933
 934	genpd = dev_to_genpd(dev);
 935	if (IS_ERR(genpd))
 936		return -EINVAL;
 937
 938	return genpd->suspend_power_off ? 0 : pm_generic_freeze_late(dev);
 939}
 940
 941/**
 942 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
 943 * @dev: Device to freeze.
 944 *
 945 * Carry out a late freeze of a device under the assumption that its
 946 * pm_domain field points to the domain member of an object of type
 947 * struct generic_pm_domain representing a power domain consisting of I/O
 948 * devices.
 949 */
 950static int pm_genpd_freeze_noirq(struct device *dev)
 951{
 952	struct generic_pm_domain *genpd;
 953
 954	dev_dbg(dev, "%s()\n", __func__);
 955
 956	genpd = dev_to_genpd(dev);
 957	if (IS_ERR(genpd))
 958		return -EINVAL;
 959
 960	return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev);
 961}
 962
 963/**
 964 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
 965 * @dev: Device to thaw.
 966 *
 967 * Start the device, unless power has been removed from the domain already
 968 * before the system transition.
 969 */
 970static int pm_genpd_thaw_noirq(struct device *dev)
 971{
 972	struct generic_pm_domain *genpd;
 
 973
 974	dev_dbg(dev, "%s()\n", __func__);
 975
 976	genpd = dev_to_genpd(dev);
 977	if (IS_ERR(genpd))
 978		return -EINVAL;
 979
 980	return genpd->suspend_power_off ?
 981		0 : genpd_start_dev(genpd, dev);
 982}
 983
 984/**
 985 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
 986 * @dev: Device to thaw.
 987 *
 988 * Carry out an early thaw of a device under the assumption that its
 989 * pm_domain field points to the domain member of an object of type
 990 * struct generic_pm_domain representing a power domain consisting of I/O
 991 * devices.
 992 */
 993static int pm_genpd_thaw_early(struct device *dev)
 994{
 995	struct generic_pm_domain *genpd;
 996
 997	dev_dbg(dev, "%s()\n", __func__);
 998
 999	genpd = dev_to_genpd(dev);
1000	if (IS_ERR(genpd))
1001		return -EINVAL;
1002
1003	return genpd->suspend_power_off ? 0 : pm_generic_thaw_early(dev);
1004}
1005
1006/**
1007 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
1008 * @dev: Device to thaw.
 
1009 *
1010 * Thaw a device under the assumption that its pm_domain field points to the
1011 * domain member of an object of type struct generic_pm_domain representing
1012 * a power domain consisting of I/O devices.
1013 */
1014static int pm_genpd_thaw(struct device *dev)
1015{
1016	struct generic_pm_domain *genpd;
1017
1018	dev_dbg(dev, "%s()\n", __func__);
1019
1020	genpd = dev_to_genpd(dev);
1021	if (IS_ERR(genpd))
1022		return -EINVAL;
1023
1024	return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
1025}
1026
1027/**
1028 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1029 * @dev: Device to resume.
1030 *
1031 * Make sure the domain will be in the same power state as before the
1032 * hibernation the system is resuming from and start the device if necessary.
1033 */
1034static int pm_genpd_restore_noirq(struct device *dev)
1035{
1036	struct generic_pm_domain *genpd;
 
1037
1038	dev_dbg(dev, "%s()\n", __func__);
1039
1040	genpd = dev_to_genpd(dev);
1041	if (IS_ERR(genpd))
1042		return -EINVAL;
1043
1044	/*
1045	 * Since all of the "noirq" callbacks are executed sequentially, it is
1046	 * guaranteed that this function will never run twice in parallel for
1047	 * the same PM domain, so it is not necessary to use locking here.
1048	 *
1049	 * At this point suspended_count == 0 means we are being run for the
1050	 * first time for the given domain in the present cycle.
1051	 */
1052	if (genpd->suspended_count++ == 0) {
 
1053		/*
1054		 * The boot kernel might put the domain into arbitrary state,
1055		 * so make it appear as powered off to pm_genpd_sync_poweron(),
1056		 * so that it tries to power it on in case it was really off.
1057		 */
1058		genpd->status = GPD_STATE_POWER_OFF;
1059		if (genpd->suspend_power_off) {
1060			/*
1061			 * If the domain was off before the hibernation, make
1062			 * sure it will be off going forward.
1063			 */
1064			genpd_power_off(genpd, true);
1065
1066			return 0;
1067		}
1068	}
1069
1070	if (genpd->suspend_power_off)
1071		return 0;
1072
1073	pm_genpd_sync_poweron(genpd, true);
 
 
 
 
 
1074
1075	return genpd_start_dev(genpd, dev);
1076}
1077
1078/**
1079 * pm_genpd_complete - Complete power transition of a device in a power domain.
1080 * @dev: Device to complete the transition of.
1081 *
1082 * Complete a power transition of a device (during a system-wide power
1083 * transition) under the assumption that its pm_domain field points to the
1084 * domain member of an object of type struct generic_pm_domain representing
1085 * a power domain consisting of I/O devices.
1086 */
1087static void pm_genpd_complete(struct device *dev)
1088{
1089	struct generic_pm_domain *genpd;
1090	bool run_complete;
1091
1092	dev_dbg(dev, "%s()\n", __func__);
1093
1094	genpd = dev_to_genpd(dev);
1095	if (IS_ERR(genpd))
1096		return;
1097
1098	mutex_lock(&genpd->lock);
1099
1100	run_complete = !genpd->suspend_power_off;
1101	if (--genpd->prepared_count == 0)
1102		genpd->suspend_power_off = false;
1103
1104	mutex_unlock(&genpd->lock);
1105
1106	if (run_complete) {
1107		pm_generic_complete(dev);
1108		pm_runtime_set_active(dev);
1109		pm_runtime_enable(dev);
1110		pm_request_idle(dev);
1111	}
1112}
1113
1114/**
1115 * genpd_syscore_switch - Switch power during system core suspend or resume.
1116 * @dev: Device that normally is marked as "always on" to switch power for.
1117 *
1118 * This routine may only be called during the system core (syscore) suspend or
1119 * resume phase for devices whose "always on" flags are set.
1120 */
1121static void genpd_syscore_switch(struct device *dev, bool suspend)
1122{
1123	struct generic_pm_domain *genpd;
1124
1125	genpd = dev_to_genpd(dev);
1126	if (!pm_genpd_present(genpd))
1127		return;
1128
1129	if (suspend) {
1130		genpd->suspended_count++;
1131		pm_genpd_sync_poweroff(genpd, false);
1132	} else {
1133		pm_genpd_sync_poweron(genpd, false);
1134		genpd->suspended_count--;
1135	}
1136}
1137
1138void pm_genpd_syscore_poweroff(struct device *dev)
1139{
1140	genpd_syscore_switch(dev, true);
1141}
1142EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1143
1144void pm_genpd_syscore_poweron(struct device *dev)
1145{
1146	genpd_syscore_switch(dev, false);
1147}
1148EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1149
1150#else /* !CONFIG_PM_SLEEP */
1151
1152#define pm_genpd_prepare		NULL
1153#define pm_genpd_suspend		NULL
1154#define pm_genpd_suspend_late		NULL
1155#define pm_genpd_suspend_noirq		NULL
1156#define pm_genpd_resume_early		NULL
1157#define pm_genpd_resume_noirq		NULL
1158#define pm_genpd_resume			NULL
1159#define pm_genpd_freeze			NULL
1160#define pm_genpd_freeze_late		NULL
1161#define pm_genpd_freeze_noirq		NULL
1162#define pm_genpd_thaw_early		NULL
1163#define pm_genpd_thaw_noirq		NULL
1164#define pm_genpd_thaw			NULL
1165#define pm_genpd_restore_noirq		NULL
1166#define pm_genpd_complete		NULL
1167
1168#endif /* CONFIG_PM_SLEEP */
1169
1170static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1171					struct generic_pm_domain *genpd,
1172					struct gpd_timing_data *td)
1173{
1174	struct generic_pm_domain_data *gpd_data;
1175	int ret;
1176
1177	ret = dev_pm_get_subsys_data(dev);
1178	if (ret)
1179		return ERR_PTR(ret);
1180
1181	gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1182	if (!gpd_data) {
1183		ret = -ENOMEM;
1184		goto err_put;
1185	}
1186
1187	if (td)
1188		gpd_data->td = *td;
1189
1190	gpd_data->base.dev = dev;
1191	gpd_data->td.constraint_changed = true;
1192	gpd_data->td.effective_constraint_ns = -1;
1193	gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1194
1195	spin_lock_irq(&dev->power.lock);
1196
1197	if (dev->power.subsys_data->domain_data) {
1198		ret = -EINVAL;
1199		goto err_free;
1200	}
1201
1202	dev->power.subsys_data->domain_data = &gpd_data->base;
1203
1204	spin_unlock_irq(&dev->power.lock);
1205
1206	dev_pm_domain_set(dev, &genpd->domain);
1207
1208	return gpd_data;
1209
1210 err_free:
1211	spin_unlock_irq(&dev->power.lock);
1212	kfree(gpd_data);
1213 err_put:
1214	dev_pm_put_subsys_data(dev);
1215	return ERR_PTR(ret);
1216}
1217
1218static void genpd_free_dev_data(struct device *dev,
1219				struct generic_pm_domain_data *gpd_data)
1220{
1221	dev_pm_domain_set(dev, NULL);
1222
1223	spin_lock_irq(&dev->power.lock);
1224
1225	dev->power.subsys_data->domain_data = NULL;
1226
1227	spin_unlock_irq(&dev->power.lock);
1228
1229	kfree(gpd_data);
1230	dev_pm_put_subsys_data(dev);
1231}
1232
1233/**
1234 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1235 * @genpd: PM domain to add the device to.
1236 * @dev: Device to be added.
1237 * @td: Set of PM QoS timing parameters to attach to the device.
1238 */
1239int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1240			  struct gpd_timing_data *td)
1241{
1242	struct generic_pm_domain_data *gpd_data;
1243	int ret = 0;
1244
1245	dev_dbg(dev, "%s()\n", __func__);
1246
1247	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1248		return -EINVAL;
1249
1250	gpd_data = genpd_alloc_dev_data(dev, genpd, td);
1251	if (IS_ERR(gpd_data))
1252		return PTR_ERR(gpd_data);
1253
1254	mutex_lock(&genpd->lock);
1255
1256	if (genpd->prepared_count > 0) {
1257		ret = -EAGAIN;
1258		goto out;
1259	}
1260
1261	ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1262	if (ret)
1263		goto out;
1264
 
 
1265	genpd->device_count++;
1266	genpd->max_off_time_changed = true;
1267
1268	list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1269
1270 out:
1271	mutex_unlock(&genpd->lock);
1272
1273	if (ret)
1274		genpd_free_dev_data(dev, gpd_data);
1275	else
1276		dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1277
1278	return ret;
1279}
1280EXPORT_SYMBOL_GPL(__pm_genpd_add_device);
1281
1282/**
1283 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1284 * @genpd: PM domain to remove the device from.
1285 * @dev: Device to be removed.
 
1286 */
1287int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1288			   struct device *dev)
 
 
 
 
 
 
 
 
 
 
 
 
 
1289{
1290	struct generic_pm_domain_data *gpd_data;
1291	struct pm_domain_data *pdd;
1292	int ret = 0;
1293
1294	dev_dbg(dev, "%s()\n", __func__);
1295
1296	if (!genpd || genpd != pm_genpd_lookup_dev(dev))
1297		return -EINVAL;
1298
1299	/* The above validation also means we have existing domain_data. */
1300	pdd = dev->power.subsys_data->domain_data;
1301	gpd_data = to_gpd_data(pdd);
1302	dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1303
1304	mutex_lock(&genpd->lock);
1305
1306	if (genpd->prepared_count > 0) {
1307		ret = -EAGAIN;
1308		goto out;
1309	}
1310
1311	genpd->device_count--;
1312	genpd->max_off_time_changed = true;
1313
1314	if (genpd->detach_dev)
1315		genpd->detach_dev(genpd, dev);
1316
 
 
1317	list_del_init(&pdd->list_node);
1318
1319	mutex_unlock(&genpd->lock);
1320
1321	genpd_free_dev_data(dev, gpd_data);
1322
1323	return 0;
1324
1325 out:
1326	mutex_unlock(&genpd->lock);
1327	dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1328
1329	return ret;
1330}
1331EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1332
1333/**
1334 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1335 * @genpd: Master PM domain to add the subdomain to.
1336 * @subdomain: Subdomain to be added.
1337 */
1338int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1339			   struct generic_pm_domain *subdomain)
 
 
 
 
 
 
 
 
 
 
1340{
1341	struct gpd_link *link, *itr;
1342	int ret = 0;
1343
1344	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1345	    || genpd == subdomain)
1346		return -EINVAL;
1347
 
 
 
 
 
 
 
 
 
 
 
1348	link = kzalloc(sizeof(*link), GFP_KERNEL);
1349	if (!link)
1350		return -ENOMEM;
1351
1352	mutex_lock(&subdomain->lock);
1353	mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
1354
1355	if (genpd->status == GPD_STATE_POWER_OFF
1356	    &&  subdomain->status != GPD_STATE_POWER_OFF) {
1357		ret = -EINVAL;
1358		goto out;
1359	}
1360
1361	list_for_each_entry(itr, &genpd->master_links, master_node) {
1362		if (itr->slave == subdomain && itr->master == genpd) {
1363			ret = -EINVAL;
1364			goto out;
1365		}
1366	}
1367
1368	link->master = genpd;
1369	list_add_tail(&link->master_node, &genpd->master_links);
1370	link->slave = subdomain;
1371	list_add_tail(&link->slave_node, &subdomain->slave_links);
1372	if (subdomain->status != GPD_STATE_POWER_OFF)
1373		genpd_sd_counter_inc(genpd);
1374
1375 out:
1376	mutex_unlock(&genpd->lock);
1377	mutex_unlock(&subdomain->lock);
1378	if (ret)
1379		kfree(link);
1380	return ret;
1381}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1382EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1383
1384/**
1385 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1386 * @genpd: Master PM domain to remove the subdomain from.
1387 * @subdomain: Subdomain to be removed.
1388 */
1389int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1390			      struct generic_pm_domain *subdomain)
1391{
1392	struct gpd_link *link;
1393	int ret = -EINVAL;
1394
1395	if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1396		return -EINVAL;
1397
1398	mutex_lock(&subdomain->lock);
1399	mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
1400
1401	if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
1402		pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1403			subdomain->name);
1404		ret = -EBUSY;
1405		goto out;
1406	}
1407
1408	list_for_each_entry(link, &genpd->master_links, master_node) {
1409		if (link->slave != subdomain)
1410			continue;
1411
1412		list_del(&link->master_node);
1413		list_del(&link->slave_node);
1414		kfree(link);
1415		if (subdomain->status != GPD_STATE_POWER_OFF)
1416			genpd_sd_counter_dec(genpd);
1417
1418		ret = 0;
1419		break;
1420	}
1421
1422out:
1423	mutex_unlock(&genpd->lock);
1424	mutex_unlock(&subdomain->lock);
1425
1426	return ret;
1427}
1428EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1429
1430/* Default device callbacks for generic PM domains. */
1431
1432/**
1433 * pm_genpd_default_save_state - Default "save device state" for PM domains.
1434 * @dev: Device to handle.
1435 */
1436static int pm_genpd_default_save_state(struct device *dev)
1437{
1438	int (*cb)(struct device *__dev);
1439
1440	if (dev->type && dev->type->pm)
1441		cb = dev->type->pm->runtime_suspend;
1442	else if (dev->class && dev->class->pm)
1443		cb = dev->class->pm->runtime_suspend;
1444	else if (dev->bus && dev->bus->pm)
1445		cb = dev->bus->pm->runtime_suspend;
1446	else
1447		cb = NULL;
1448
1449	if (!cb && dev->driver && dev->driver->pm)
1450		cb = dev->driver->pm->runtime_suspend;
 
1451
1452	return cb ? cb(dev) : 0;
1453}
1454
1455/**
1456 * pm_genpd_default_restore_state - Default PM domains "restore device state".
1457 * @dev: Device to handle.
1458 */
1459static int pm_genpd_default_restore_state(struct device *dev)
1460{
1461	int (*cb)(struct device *__dev);
1462
1463	if (dev->type && dev->type->pm)
1464		cb = dev->type->pm->runtime_resume;
1465	else if (dev->class && dev->class->pm)
1466		cb = dev->class->pm->runtime_resume;
1467	else if (dev->bus && dev->bus->pm)
1468		cb = dev->bus->pm->runtime_resume;
1469	else
1470		cb = NULL;
1471
1472	if (!cb && dev->driver && dev->driver->pm)
1473		cb = dev->driver->pm->runtime_resume;
1474
1475	return cb ? cb(dev) : 0;
1476}
1477
1478/**
1479 * pm_genpd_init - Initialize a generic I/O PM domain object.
1480 * @genpd: PM domain object to initialize.
1481 * @gov: PM domain governor to associate with the domain (may be NULL).
1482 * @is_off: Initial value of the domain's power_is_off field.
 
 
1483 */
1484void pm_genpd_init(struct generic_pm_domain *genpd,
1485		   struct dev_power_governor *gov, bool is_off)
1486{
 
 
1487	if (IS_ERR_OR_NULL(genpd))
1488		return;
1489
1490	INIT_LIST_HEAD(&genpd->master_links);
1491	INIT_LIST_HEAD(&genpd->slave_links);
1492	INIT_LIST_HEAD(&genpd->dev_list);
1493	mutex_init(&genpd->lock);
1494	genpd->gov = gov;
1495	INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1496	atomic_set(&genpd->sd_count, 0);
1497	genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1498	genpd->device_count = 0;
1499	genpd->max_off_time_ns = -1;
1500	genpd->max_off_time_changed = true;
1501	genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
1502	genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
1503	genpd->domain.ops.prepare = pm_genpd_prepare;
1504	genpd->domain.ops.suspend = pm_genpd_suspend;
1505	genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
1506	genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1507	genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1508	genpd->domain.ops.resume_early = pm_genpd_resume_early;
1509	genpd->domain.ops.resume = pm_genpd_resume;
1510	genpd->domain.ops.freeze = pm_genpd_freeze;
1511	genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
1512	genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1513	genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1514	genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
1515	genpd->domain.ops.thaw = pm_genpd_thaw;
1516	genpd->domain.ops.poweroff = pm_genpd_suspend;
1517	genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
1518	genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
1519	genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1520	genpd->domain.ops.restore_early = pm_genpd_resume_early;
1521	genpd->domain.ops.restore = pm_genpd_resume;
1522	genpd->domain.ops.complete = pm_genpd_complete;
1523	genpd->dev_ops.save_state = pm_genpd_default_save_state;
1524	genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
1525
1526	if (genpd->flags & GENPD_FLAG_PM_CLK) {
1527		genpd->dev_ops.stop = pm_clk_suspend;
1528		genpd->dev_ops.start = pm_clk_resume;
1529	}
1530
1531	if (genpd->state_idx >= GENPD_MAX_NUM_STATES) {
1532		pr_warn("Initial state index out of bounds.\n");
1533		genpd->state_idx = GENPD_MAX_NUM_STATES - 1;
1534	}
1535
1536	if (genpd->state_count > GENPD_MAX_NUM_STATES) {
1537		pr_warn("Limiting states to  %d\n", GENPD_MAX_NUM_STATES);
1538		genpd->state_count = GENPD_MAX_NUM_STATES;
1539	}
1540
1541	/* Use only one "off" state if there were no states declared */
1542	if (genpd->state_count == 0)
1543		genpd->state_count = 1;
 
 
 
1544
1545	mutex_lock(&gpd_list_lock);
1546	list_add(&genpd->gpd_list_node, &gpd_list);
1547	mutex_unlock(&gpd_list_lock);
 
 
1548}
1549EXPORT_SYMBOL_GPL(pm_genpd_init);
1550
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1551#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
 
1552/*
1553 * Device Tree based PM domain providers.
1554 *
1555 * The code below implements generic device tree based PM domain providers that
1556 * bind device tree nodes with generic PM domains registered in the system.
1557 *
1558 * Any driver that registers generic PM domains and needs to support binding of
1559 * devices to these domains is supposed to register a PM domain provider, which
1560 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1561 *
1562 * Two simple mapping functions have been provided for convenience:
1563 *  - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1564 *  - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
1565 *    index.
1566 */
1567
1568/**
1569 * struct of_genpd_provider - PM domain provider registration structure
1570 * @link: Entry in global list of PM domain providers
1571 * @node: Pointer to device tree node of PM domain provider
1572 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1573 *         into a PM domain.
1574 * @data: context pointer to be passed into @xlate callback
1575 */
1576struct of_genpd_provider {
1577	struct list_head link;
1578	struct device_node *node;
1579	genpd_xlate_t xlate;
1580	void *data;
1581};
1582
1583/* List of registered PM domain providers. */
1584static LIST_HEAD(of_genpd_providers);
1585/* Mutex to protect the list above. */
1586static DEFINE_MUTEX(of_genpd_mutex);
1587
1588/**
1589 * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
1590 * @genpdspec: OF phandle args to map into a PM domain
1591 * @data: xlate function private data - pointer to struct generic_pm_domain
1592 *
1593 * This is a generic xlate function that can be used to model PM domains that
1594 * have their own device tree nodes. The private data of xlate function needs
1595 * to be a valid pointer to struct generic_pm_domain.
1596 */
1597struct generic_pm_domain *__of_genpd_xlate_simple(
1598					struct of_phandle_args *genpdspec,
1599					void *data)
1600{
1601	if (genpdspec->args_count != 0)
1602		return ERR_PTR(-EINVAL);
1603	return data;
1604}
1605EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple);
1606
1607/**
1608 * __of_genpd_xlate_onecell() - Xlate function using a single index.
1609 * @genpdspec: OF phandle args to map into a PM domain
1610 * @data: xlate function private data - pointer to struct genpd_onecell_data
1611 *
1612 * This is a generic xlate function that can be used to model simple PM domain
1613 * controllers that have one device tree node and provide multiple PM domains.
1614 * A single cell is used as an index into an array of PM domains specified in
1615 * the genpd_onecell_data struct when registering the provider.
1616 */
1617struct generic_pm_domain *__of_genpd_xlate_onecell(
1618					struct of_phandle_args *genpdspec,
1619					void *data)
1620{
1621	struct genpd_onecell_data *genpd_data = data;
1622	unsigned int idx = genpdspec->args[0];
1623
1624	if (genpdspec->args_count != 1)
1625		return ERR_PTR(-EINVAL);
1626
1627	if (idx >= genpd_data->num_domains) {
1628		pr_err("%s: invalid domain index %u\n", __func__, idx);
1629		return ERR_PTR(-EINVAL);
1630	}
1631
1632	if (!genpd_data->domains[idx])
1633		return ERR_PTR(-ENOENT);
1634
1635	return genpd_data->domains[idx];
1636}
1637EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell);
1638
1639/**
1640 * __of_genpd_add_provider() - Register a PM domain provider for a node
1641 * @np: Device node pointer associated with the PM domain provider.
1642 * @xlate: Callback for decoding PM domain from phandle arguments.
1643 * @data: Context pointer for @xlate callback.
1644 */
1645int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1646			void *data)
1647{
1648	struct of_genpd_provider *cp;
1649
1650	cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1651	if (!cp)
1652		return -ENOMEM;
1653
1654	cp->node = of_node_get(np);
1655	cp->data = data;
1656	cp->xlate = xlate;
1657
1658	mutex_lock(&of_genpd_mutex);
1659	list_add(&cp->link, &of_genpd_providers);
1660	mutex_unlock(&of_genpd_mutex);
1661	pr_debug("Added domain provider from %s\n", np->full_name);
1662
1663	return 0;
1664}
1665EXPORT_SYMBOL_GPL(__of_genpd_add_provider);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1666
1667/**
1668 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1669 * @np: Device node pointer associated with the PM domain provider
1670 */
1671void of_genpd_del_provider(struct device_node *np)
1672{
1673	struct of_genpd_provider *cp;
 
1674
 
1675	mutex_lock(&of_genpd_mutex);
1676	list_for_each_entry(cp, &of_genpd_providers, link) {
1677		if (cp->node == np) {
 
 
 
 
 
 
 
 
 
1678			list_del(&cp->link);
1679			of_node_put(cp->node);
1680			kfree(cp);
1681			break;
1682		}
1683	}
1684	mutex_unlock(&of_genpd_mutex);
 
1685}
1686EXPORT_SYMBOL_GPL(of_genpd_del_provider);
1687
1688/**
1689 * of_genpd_get_from_provider() - Look-up PM domain
1690 * @genpdspec: OF phandle args to use for look-up
1691 *
1692 * Looks for a PM domain provider under the node specified by @genpdspec and if
1693 * found, uses xlate function of the provider to map phandle args to a PM
1694 * domain.
1695 *
1696 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
1697 * on failure.
1698 */
1699struct generic_pm_domain *of_genpd_get_from_provider(
1700					struct of_phandle_args *genpdspec)
1701{
1702	struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
1703	struct of_genpd_provider *provider;
1704
1705	if (!genpdspec)
1706		return ERR_PTR(-EINVAL);
1707
1708	mutex_lock(&of_genpd_mutex);
1709
1710	/* Check if we have such a provider in our array */
1711	list_for_each_entry(provider, &of_genpd_providers, link) {
1712		if (provider->node == genpdspec->np)
1713			genpd = provider->xlate(genpdspec, provider->data);
1714		if (!IS_ERR(genpd))
1715			break;
1716	}
1717
1718	mutex_unlock(&of_genpd_mutex);
1719
1720	return genpd;
1721}
1722EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1723
1724/**
1725 * genpd_dev_pm_detach - Detach a device from its PM domain.
1726 * @dev: Device to detach.
1727 * @power_off: Currently not used
1728 *
1729 * Try to locate a corresponding generic PM domain, which the device was
1730 * attached to previously. If such is found, the device is detached from it.
1731 */
1732static void genpd_dev_pm_detach(struct device *dev, bool power_off)
1733{
1734	struct generic_pm_domain *pd;
1735	unsigned int i;
1736	int ret = 0;
1737
1738	pd = pm_genpd_lookup_dev(dev);
1739	if (!pd)
1740		return;
1741
1742	dev_dbg(dev, "removing from PM domain %s\n", pd->name);
1743
1744	for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1745		ret = pm_genpd_remove_device(pd, dev);
1746		if (ret != -EAGAIN)
1747			break;
1748
1749		mdelay(i);
1750		cond_resched();
1751	}
1752
1753	if (ret < 0) {
1754		dev_err(dev, "failed to remove from PM domain %s: %d",
1755			pd->name, ret);
1756		return;
1757	}
1758
1759	/* Check if PM domain can be powered off after removing this device. */
1760	genpd_queue_power_off_work(pd);
1761}
1762
1763static void genpd_dev_pm_sync(struct device *dev)
1764{
1765	struct generic_pm_domain *pd;
1766
1767	pd = dev_to_genpd(dev);
1768	if (IS_ERR(pd))
1769		return;
1770
1771	genpd_queue_power_off_work(pd);
1772}
1773
1774/**
1775 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
1776 * @dev: Device to attach.
1777 *
1778 * Parse device's OF node to find a PM domain specifier. If such is found,
1779 * attaches the device to retrieved pm_domain ops.
1780 *
1781 * Both generic and legacy Samsung-specific DT bindings are supported to keep
1782 * backwards compatibility with existing DTBs.
1783 *
1784 * Returns 0 on successfully attached PM domain or negative error code. Note
1785 * that if a power-domain exists for the device, but it cannot be found or
1786 * turned on, then return -EPROBE_DEFER to ensure that the device is not
1787 * probed and to re-try again later.
1788 */
1789int genpd_dev_pm_attach(struct device *dev)
1790{
1791	struct of_phandle_args pd_args;
1792	struct generic_pm_domain *pd;
1793	unsigned int i;
1794	int ret;
1795
1796	if (!dev->of_node)
1797		return -ENODEV;
1798
1799	if (dev->pm_domain)
1800		return -EEXIST;
1801
1802	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
1803					"#power-domain-cells", 0, &pd_args);
1804	if (ret < 0) {
1805		if (ret != -ENOENT)
1806			return ret;
1807
1808		/*
1809		 * Try legacy Samsung-specific bindings
1810		 * (for backwards compatibility of DT ABI)
1811		 */
1812		pd_args.args_count = 0;
1813		pd_args.np = of_parse_phandle(dev->of_node,
1814						"samsung,power-domain", 0);
1815		if (!pd_args.np)
1816			return -ENOENT;
1817	}
1818
1819	pd = of_genpd_get_from_provider(&pd_args);
 
1820	of_node_put(pd_args.np);
1821	if (IS_ERR(pd)) {
 
1822		dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
1823			__func__, PTR_ERR(pd));
1824		return -EPROBE_DEFER;
1825	}
1826
1827	dev_dbg(dev, "adding to PM domain %s\n", pd->name);
1828
1829	for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1830		ret = pm_genpd_add_device(pd, dev);
1831		if (ret != -EAGAIN)
1832			break;
1833
1834		mdelay(i);
1835		cond_resched();
1836	}
 
1837
1838	if (ret < 0) {
1839		dev_err(dev, "failed to add to PM domain %s: %d",
1840			pd->name, ret);
 
1841		goto out;
1842	}
1843
1844	dev->pm_domain->detach = genpd_dev_pm_detach;
1845	dev->pm_domain->sync = genpd_dev_pm_sync;
1846
1847	mutex_lock(&pd->lock);
1848	ret = genpd_poweron(pd, 0);
1849	mutex_unlock(&pd->lock);
1850out:
1851	return ret ? -EPROBE_DEFER : 0;
1852}
1853EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1854#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
1855
1856
1857/***        debugfs support        ***/
1858
1859#ifdef CONFIG_PM_ADVANCED_DEBUG
1860#include <linux/pm.h>
1861#include <linux/device.h>
1862#include <linux/debugfs.h>
1863#include <linux/seq_file.h>
1864#include <linux/init.h>
1865#include <linux/kobject.h>
1866static struct dentry *pm_genpd_debugfs_dir;
1867
1868/*
1869 * TODO: This function is a slightly modified version of rtpm_status_show
1870 * from sysfs.c, so generalize it.
1871 */
1872static void rtpm_status_str(struct seq_file *s, struct device *dev)
1873{
1874	static const char * const status_lookup[] = {
1875		[RPM_ACTIVE] = "active",
1876		[RPM_RESUMING] = "resuming",
1877		[RPM_SUSPENDED] = "suspended",
1878		[RPM_SUSPENDING] = "suspending"
1879	};
1880	const char *p = "";
1881
1882	if (dev->power.runtime_error)
1883		p = "error";
1884	else if (dev->power.disable_depth)
1885		p = "unsupported";
1886	else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
1887		p = status_lookup[dev->power.runtime_status];
1888	else
1889		WARN_ON(1);
1890
1891	seq_puts(s, p);
1892}
1893
1894static int pm_genpd_summary_one(struct seq_file *s,
1895				struct generic_pm_domain *genpd)
1896{
1897	static const char * const status_lookup[] = {
1898		[GPD_STATE_ACTIVE] = "on",
1899		[GPD_STATE_POWER_OFF] = "off"
1900	};
1901	struct pm_domain_data *pm_data;
1902	const char *kobj_path;
1903	struct gpd_link *link;
1904	char state[16];
1905	int ret;
1906
1907	ret = mutex_lock_interruptible(&genpd->lock);
1908	if (ret)
1909		return -ERESTARTSYS;
1910
1911	if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
1912		goto exit;
1913	if (genpd->status == GPD_STATE_POWER_OFF)
1914		snprintf(state, sizeof(state), "%s-%u",
1915			 status_lookup[genpd->status], genpd->state_idx);
1916	else
1917		snprintf(state, sizeof(state), "%s",
1918			 status_lookup[genpd->status]);
1919	seq_printf(s, "%-30s  %-15s ", genpd->name, state);
1920
1921	/*
1922	 * Modifications on the list require holding locks on both
1923	 * master and slave, so we are safe.
1924	 * Also genpd->name is immutable.
1925	 */
1926	list_for_each_entry(link, &genpd->master_links, master_node) {
1927		seq_printf(s, "%s", link->slave->name);
1928		if (!list_is_last(&link->master_node, &genpd->master_links))
1929			seq_puts(s, ", ");
1930	}
1931
1932	list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
1933		kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
 
 
1934		if (kobj_path == NULL)
1935			continue;
1936
1937		seq_printf(s, "\n    %-50s  ", kobj_path);
1938		rtpm_status_str(s, pm_data->dev);
1939		kfree(kobj_path);
1940	}
1941
1942	seq_puts(s, "\n");
1943exit:
1944	mutex_unlock(&genpd->lock);
1945
1946	return 0;
1947}
1948
1949static int pm_genpd_summary_show(struct seq_file *s, void *data)
1950{
1951	struct generic_pm_domain *genpd;
1952	int ret = 0;
1953
1954	seq_puts(s, "domain                          status          slaves\n");
1955	seq_puts(s, "    /device                                             runtime status\n");
1956	seq_puts(s, "----------------------------------------------------------------------\n");
1957
1958	ret = mutex_lock_interruptible(&gpd_list_lock);
1959	if (ret)
1960		return -ERESTARTSYS;
1961
1962	list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
1963		ret = pm_genpd_summary_one(s, genpd);
1964		if (ret)
1965			break;
1966	}
1967	mutex_unlock(&gpd_list_lock);
1968
1969	return ret;
1970}
1971
1972static int pm_genpd_summary_open(struct inode *inode, struct file *file)
1973{
1974	return single_open(file, pm_genpd_summary_show, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1975}
1976
1977static const struct file_operations pm_genpd_summary_fops = {
1978	.open = pm_genpd_summary_open,
1979	.read = seq_read,
1980	.llseek = seq_lseek,
1981	.release = single_release,
1982};
 
 
 
 
 
 
1983
1984static int __init pm_genpd_debug_init(void)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1985{
1986	struct dentry *d;
 
1987
1988	pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
1989
1990	if (!pm_genpd_debugfs_dir)
1991		return -ENOMEM;
1992
1993	d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
1994			pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
1995	if (!d)
1996		return -ENOMEM;
1997
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1998	return 0;
1999}
2000late_initcall(pm_genpd_debug_init);
2001
2002static void __exit pm_genpd_debug_exit(void)
2003{
2004	debugfs_remove_recursive(pm_genpd_debugfs_dir);
2005}
2006__exitcall(pm_genpd_debug_exit);
2007#endif /* CONFIG_PM_ADVANCED_DEBUG */