1// SPDX-License-Identifier: GPL-2.0
   2/*
 
 
   3 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
   4 * (C) Copyright 2007 Novell Inc.
 
 
 
   5 */
   6
   7#include <linux/pci.h>
   8#include <linux/module.h>
   9#include <linux/init.h>
  10#include <linux/device.h>
  11#include <linux/mempolicy.h>
  12#include <linux/string.h>
  13#include <linux/slab.h>
  14#include <linux/sched.h>
  15#include <linux/sched/isolation.h>
  16#include <linux/cpu.h>
  17#include <linux/pm_runtime.h>
  18#include <linux/suspend.h>
  19#include <linux/kexec.h>
  20#include <linux/of_device.h>
  21#include <linux/acpi.h>
  22#include <linux/dma-map-ops.h>
  23#include <linux/iommu.h>
  24#include "pci.h"
  25#include "pcie/portdrv.h"
  26
  27struct pci_dynid {
  28	struct list_head node;
  29	struct pci_device_id id;
  30};
  31
  32/**
  33 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
  34 * @drv: target pci driver
  35 * @vendor: PCI vendor ID
  36 * @device: PCI device ID
  37 * @subvendor: PCI subvendor ID
  38 * @subdevice: PCI subdevice ID
  39 * @class: PCI class
  40 * @class_mask: PCI class mask
  41 * @driver_data: private driver data
  42 *
  43 * Adds a new dynamic pci device ID to this driver and causes the
  44 * driver to probe for all devices again.  @drv must have been
  45 * registered prior to calling this function.
  46 *
  47 * CONTEXT:
  48 * Does GFP_KERNEL allocation.
  49 *
  50 * RETURNS:
  51 * 0 on success, -errno on failure.
  52 */
  53int pci_add_dynid(struct pci_driver *drv,
  54		  unsigned int vendor, unsigned int device,
  55		  unsigned int subvendor, unsigned int subdevice,
  56		  unsigned int class, unsigned int class_mask,
  57		  unsigned long driver_data)
  58{
  59	struct pci_dynid *dynid;
 
  60
  61	dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
  62	if (!dynid)
  63		return -ENOMEM;
  64
  65	dynid->id.vendor = vendor;
  66	dynid->id.device = device;
  67	dynid->id.subvendor = subvendor;
  68	dynid->id.subdevice = subdevice;
  69	dynid->id.class = class;
  70	dynid->id.class_mask = class_mask;
  71	dynid->id.driver_data = driver_data;
  72
  73	spin_lock(&drv->dynids.lock);
  74	list_add_tail(&dynid->node, &drv->dynids.list);
  75	spin_unlock(&drv->dynids.lock);
  76
  77	return driver_attach(&drv->driver);
 
 
  78}
  79EXPORT_SYMBOL_GPL(pci_add_dynid);
  80
  81static void pci_free_dynids(struct pci_driver *drv)
  82{
  83	struct pci_dynid *dynid, *n;
  84
  85	spin_lock(&drv->dynids.lock);
  86	list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
  87		list_del(&dynid->node);
  88		kfree(dynid);
  89	}
  90	spin_unlock(&drv->dynids.lock);
  91}
  92
  93/**
  94 * pci_match_id - See if a PCI device matches a given pci_id table
  95 * @ids: array of PCI device ID structures to search in
  96 * @dev: the PCI device structure to match against.
  97 *
  98 * Used by a driver to check whether a PCI device is in its list of
  99 * supported devices.  Returns the matching pci_device_id structure or
 100 * %NULL if there is no match.
 101 *
 102 * Deprecated; don't use this as it will not catch any dynamic IDs
 103 * that a driver might want to check for.
 104 */
 105const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
 106					 struct pci_dev *dev)
 107{
 108	if (ids) {
 109		while (ids->vendor || ids->subvendor || ids->class_mask) {
 110			if (pci_match_one_device(ids, dev))
 111				return ids;
 112			ids++;
 113		}
 114	}
 115	return NULL;
 116}
 117EXPORT_SYMBOL(pci_match_id);
 118
 119static const struct pci_device_id pci_device_id_any = {
 120	.vendor = PCI_ANY_ID,
 121	.device = PCI_ANY_ID,
 122	.subvendor = PCI_ANY_ID,
 123	.subdevice = PCI_ANY_ID,
 124};
 125
 126/**
 127 * pci_match_device - See if a device matches a driver's list of IDs
 128 * @drv: the PCI driver to match against
 129 * @dev: the PCI device structure to match against
 130 *
 131 * Used by a driver to check whether a PCI device is in its list of
 132 * supported devices or in the dynids list, which may have been augmented
 133 * via the sysfs "new_id" file.  Returns the matching pci_device_id
 134 * structure or %NULL if there is no match.
 135 */
 136static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
 137						    struct pci_dev *dev)
 138{
 139	struct pci_dynid *dynid;
 140	const struct pci_device_id *found_id = NULL, *ids;
 141
 142	/* When driver_override is set, only bind to the matching driver */
 143	if (dev->driver_override && strcmp(dev->driver_override, drv->name))
 144		return NULL;
 145
 146	/* Look at the dynamic ids first, before the static ones */
 147	spin_lock(&drv->dynids.lock);
 148	list_for_each_entry(dynid, &drv->dynids.list, node) {
 149		if (pci_match_one_device(&dynid->id, dev)) {
 150			found_id = &dynid->id;
 151			break;
 152		}
 153	}
 154	spin_unlock(&drv->dynids.lock);
 155
 156	if (found_id)
 157		return found_id;
 158
 159	for (ids = drv->id_table; (found_id = pci_match_id(ids, dev));
 160	     ids = found_id + 1) {
 161		/*
 162		 * The match table is split based on driver_override.
 163		 * In case override_only was set, enforce driver_override
 164		 * matching.
 165		 */
 166		if (found_id->override_only) {
 167			if (dev->driver_override)
 168				return found_id;
 169		} else {
 170			return found_id;
 171		}
 172	}
 173
 174	/* driver_override will always match, send a dummy id */
 175	if (dev->driver_override)
 176		return &pci_device_id_any;
 177	return NULL;
 178}
 179
 180/**
 181 * new_id_store - sysfs frontend to pci_add_dynid()
 182 * @driver: target device driver
 183 * @buf: buffer for scanning device ID data
 184 * @count: input size
 185 *
 186 * Allow PCI IDs to be added to an existing driver via sysfs.
 187 */
 188static ssize_t new_id_store(struct device_driver *driver, const char *buf,
 189			    size_t count)
 190{
 191	struct pci_driver *pdrv = to_pci_driver(driver);
 192	const struct pci_device_id *ids = pdrv->id_table;
 193	u32 vendor, device, subvendor = PCI_ANY_ID,
 194		subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
 195	unsigned long driver_data = 0;
 196	int fields;
 197	int retval = 0;
 198
 199	fields = sscanf(buf, "%x %x %x %x %x %x %lx",
 200			&vendor, &device, &subvendor, &subdevice,
 201			&class, &class_mask, &driver_data);
 202	if (fields < 2)
 203		return -EINVAL;
 204
 205	if (fields != 7) {
 206		struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
 207		if (!pdev)
 208			return -ENOMEM;
 209
 210		pdev->vendor = vendor;
 211		pdev->device = device;
 212		pdev->subsystem_vendor = subvendor;
 213		pdev->subsystem_device = subdevice;
 214		pdev->class = class;
 215
 216		if (pci_match_device(pdrv, pdev))
 217			retval = -EEXIST;
 218
 219		kfree(pdev);
 220
 221		if (retval)
 222			return retval;
 223	}
 224
 225	/* Only accept driver_data values that match an existing id_table
 226	   entry */
 227	if (ids) {
 228		retval = -EINVAL;
 229		while (ids->vendor || ids->subvendor || ids->class_mask) {
 230			if (driver_data == ids->driver_data) {
 231				retval = 0;
 232				break;
 233			}
 234			ids++;
 235		}
 236		if (retval)	/* No match */
 237			return retval;
 238	}
 239
 240	retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
 241			       class, class_mask, driver_data);
 242	if (retval)
 243		return retval;
 244	return count;
 245}
 246static DRIVER_ATTR_WO(new_id);
 247
 248/**
 249 * remove_id_store - remove a PCI device ID from this driver
 250 * @driver: target device driver
 251 * @buf: buffer for scanning device ID data
 252 * @count: input size
 253 *
 254 * Removes a dynamic pci device ID to this driver.
 255 */
 256static ssize_t remove_id_store(struct device_driver *driver, const char *buf,
 257			       size_t count)
 258{
 259	struct pci_dynid *dynid, *n;
 260	struct pci_driver *pdrv = to_pci_driver(driver);
 261	u32 vendor, device, subvendor = PCI_ANY_ID,
 262		subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
 263	int fields;
 264	size_t retval = -ENODEV;
 265
 266	fields = sscanf(buf, "%x %x %x %x %x %x",
 267			&vendor, &device, &subvendor, &subdevice,
 268			&class, &class_mask);
 269	if (fields < 2)
 270		return -EINVAL;
 271
 272	spin_lock(&pdrv->dynids.lock);
 273	list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
 274		struct pci_device_id *id = &dynid->id;
 275		if ((id->vendor == vendor) &&
 276		    (id->device == device) &&
 277		    (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
 278		    (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
 279		    !((id->class ^ class) & class_mask)) {
 280			list_del(&dynid->node);
 281			kfree(dynid);
 282			retval = count;
 283			break;
 284		}
 285	}
 286	spin_unlock(&pdrv->dynids.lock);
 287
 288	return retval;
 
 
 289}
 290static DRIVER_ATTR_WO(remove_id);
 291
 292static struct attribute *pci_drv_attrs[] = {
 293	&driver_attr_new_id.attr,
 294	&driver_attr_remove_id.attr,
 295	NULL,
 296};
 297ATTRIBUTE_GROUPS(pci_drv);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 298
 299struct drv_dev_and_id {
 300	struct pci_driver *drv;
 301	struct pci_dev *dev;
 302	const struct pci_device_id *id;
 303};
 304
 305static long local_pci_probe(void *_ddi)
 306{
 307	struct drv_dev_and_id *ddi = _ddi;
 308	struct pci_dev *pci_dev = ddi->dev;
 309	struct pci_driver *pci_drv = ddi->drv;
 310	struct device *dev = &pci_dev->dev;
 311	int rc;
 312
 313	/*
 314	 * Unbound PCI devices are always put in D0, regardless of
 315	 * runtime PM status.  During probe, the device is set to
 316	 * active and the usage count is incremented.  If the driver
 317	 * supports runtime PM, it should call pm_runtime_put_noidle(),
 318	 * or any other runtime PM helper function decrementing the usage
 319	 * count, in its probe routine and pm_runtime_get_noresume() in
 320	 * its remove routine.
 321	 */
 322	pm_runtime_get_sync(dev);
 323	pci_dev->driver = pci_drv;
 324	rc = pci_drv->probe(pci_dev, ddi->id);
 325	if (!rc)
 326		return rc;
 327	if (rc < 0) {
 328		pci_dev->driver = NULL;
 329		pm_runtime_put_sync(dev);
 330		return rc;
 331	}
 332	/*
 333	 * Probe function should return < 0 for failure, 0 for success
 334	 * Treat values > 0 as success, but warn.
 335	 */
 336	pci_warn(pci_dev, "Driver probe function unexpectedly returned %d\n",
 337		 rc);
 338	return 0;
 339}
 340
 341static bool pci_physfn_is_probed(struct pci_dev *dev)
 342{
 343#ifdef CONFIG_PCI_IOV
 344	return dev->is_virtfn && dev->physfn->is_probed;
 345#else
 346	return false;
 347#endif
 348}
 349
 350static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 351			  const struct pci_device_id *id)
 352{
 353	int error, node, cpu;
 354	struct drv_dev_and_id ddi = { drv, dev, id };
 355
 356	/*
 357	 * Execute driver initialization on node where the device is
 358	 * attached.  This way the driver likely allocates its local memory
 359	 * on the right node.
 360	 */
 361	node = dev_to_node(&dev->dev);
 362	dev->is_probed = 1;
 363
 364	cpu_hotplug_disable();
 365
 366	/*
 367	 * Prevent nesting work_on_cpu() for the case where a Virtual Function
 368	 * device is probed from work_on_cpu() of the Physical device.
 369	 */
 370	if (node < 0 || node >= MAX_NUMNODES || !node_online(node) ||
 371	    pci_physfn_is_probed(dev)) {
 372		cpu = nr_cpu_ids;
 373	} else {
 374		cpumask_var_t wq_domain_mask;
 375
 376		if (!zalloc_cpumask_var(&wq_domain_mask, GFP_KERNEL)) {
 377			error = -ENOMEM;
 378			goto out;
 379		}
 380		cpumask_and(wq_domain_mask,
 381			    housekeeping_cpumask(HK_TYPE_WQ),
 382			    housekeeping_cpumask(HK_TYPE_DOMAIN));
 383
 384		cpu = cpumask_any_and(cpumask_of_node(node),
 385				      wq_domain_mask);
 386		free_cpumask_var(wq_domain_mask);
 387	}
 388
 389	if (cpu < nr_cpu_ids)
 390		error = work_on_cpu(cpu, local_pci_probe, &ddi);
 391	else
 
 
 
 
 
 392		error = local_pci_probe(&ddi);
 393out:
 394	dev->is_probed = 0;
 395	cpu_hotplug_enable();
 396	return error;
 397}
 398
 399/**
 400 * __pci_device_probe - check if a driver wants to claim a specific PCI device
 401 * @drv: driver to call to check if it wants the PCI device
 402 * @pci_dev: PCI device being probed
 403 *
 404 * returns 0 on success, else error.
 405 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
 406 */
 407static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
 
 408{
 409	const struct pci_device_id *id;
 410	int error = 0;
 411
 412	if (drv->probe) {
 413		error = -ENODEV;
 414
 415		id = pci_match_device(drv, pci_dev);
 416		if (id)
 417			error = pci_call_probe(drv, pci_dev, id);
 
 
 
 
 418	}
 419	return error;
 420}
 421
 422int __weak pcibios_alloc_irq(struct pci_dev *dev)
 423{
 424	return 0;
 425}
 426
 427void __weak pcibios_free_irq(struct pci_dev *dev)
 428{
 429}
 430
 431#ifdef CONFIG_PCI_IOV
 432static inline bool pci_device_can_probe(struct pci_dev *pdev)
 433{
 434	return (!pdev->is_virtfn || pdev->physfn->sriov->drivers_autoprobe ||
 435		pdev->driver_override);
 436}
 437#else
 438static inline bool pci_device_can_probe(struct pci_dev *pdev)
 439{
 440	return true;
 441}
 442#endif
 443
 444static int pci_device_probe(struct device *dev)
 445{
 446	int error;
 447	struct pci_dev *pci_dev = to_pci_dev(dev);
 448	struct pci_driver *drv = to_pci_driver(dev->driver);
 449
 450	if (!pci_device_can_probe(pci_dev))
 451		return -ENODEV;
 452
 453	pci_assign_irq(pci_dev);
 454
 455	error = pcibios_alloc_irq(pci_dev);
 456	if (error < 0)
 457		return error;
 458
 
 
 459	pci_dev_get(pci_dev);
 460	error = __pci_device_probe(drv, pci_dev);
 461	if (error) {
 462		pcibios_free_irq(pci_dev);
 463		pci_dev_put(pci_dev);
 464	}
 465
 466	return error;
 467}
 468
 469static void pci_device_remove(struct device *dev)
 470{
 471	struct pci_dev *pci_dev = to_pci_dev(dev);
 472	struct pci_driver *drv = pci_dev->driver;
 473
 474	if (drv->remove) {
 475		pm_runtime_get_sync(dev);
 476		drv->remove(pci_dev);
 477		pm_runtime_put_noidle(dev);
 
 
 
 478	}
 479	pcibios_free_irq(pci_dev);
 480	pci_dev->driver = NULL;
 481	pci_iov_remove(pci_dev);
 482
 483	/* Undo the runtime PM settings in local_pci_probe() */
 484	pm_runtime_put_sync(dev);
 
 
 485
 486	/*
 487	 * If the device is still on, set the power state as "unknown",
 488	 * since it might change by the next time we load the driver.
 489	 */
 490	if (pci_dev->current_state == PCI_D0)
 491		pci_dev->current_state = PCI_UNKNOWN;
 492
 493	/*
 494	 * We would love to complain here if pci_dev->is_enabled is set, that
 495	 * the driver should have called pci_disable_device(), but the
 496	 * unfortunate fact is there are too many odd BIOS and bridge setups
 497	 * that don't like drivers doing that all of the time.
 498	 * Oh well, we can dream of sane hardware when we sleep, no matter how
 499	 * horrible the crap we have to deal with is when we are awake...
 500	 */
 501
 502	pci_dev_put(pci_dev);
 
 503}
 504
 505static void pci_device_shutdown(struct device *dev)
 506{
 507	struct pci_dev *pci_dev = to_pci_dev(dev);
 508	struct pci_driver *drv = pci_dev->driver;
 509
 510	pm_runtime_resume(dev);
 511
 512	if (drv && drv->shutdown)
 513		drv->shutdown(pci_dev);
 
 
 514
 515	/*
 516	 * If this is a kexec reboot, turn off Bus Master bit on the
 517	 * device to tell it to not continue to do DMA. Don't touch
 518	 * devices in D3cold or unknown states.
 519	 * If it is not a kexec reboot, firmware will hit the PCI
 520	 * devices with big hammer and stop their DMA any way.
 521	 */
 522	if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
 523		pci_clear_master(pci_dev);
 
 
 
 
 
 
 
 
 
 524}
 525
 526#ifdef CONFIG_PM_SLEEP
 527
 528/* Auxiliary functions used for system resume */
 529
 530/**
 531 * pci_restore_standard_config - restore standard config registers of PCI device
 532 * @pci_dev: PCI device to handle
 533 */
 534static int pci_restore_standard_config(struct pci_dev *pci_dev)
 535{
 536	pci_update_current_state(pci_dev, PCI_UNKNOWN);
 537
 538	if (pci_dev->current_state != PCI_D0) {
 539		int error = pci_set_power_state(pci_dev, PCI_D0);
 540		if (error)
 541			return error;
 542	}
 543
 544	pci_restore_state(pci_dev);
 545	pci_pme_restore(pci_dev);
 546	return 0;
 547}
 548#endif /* CONFIG_PM_SLEEP */
 549
 550#ifdef CONFIG_PM
 551
 552/* Auxiliary functions used for system resume and run-time resume */
 553
 554static void pci_pm_default_resume(struct pci_dev *pci_dev)
 555{
 556	pci_fixup_device(pci_fixup_resume, pci_dev);
 557	pci_enable_wake(pci_dev, PCI_D0, false);
 558}
 559
 560static void pci_pm_power_up_and_verify_state(struct pci_dev *pci_dev)
 561{
 562	pci_power_up(pci_dev);
 563	pci_update_current_state(pci_dev, PCI_D0);
 564}
 565
 566static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
 567{
 568	pci_pm_power_up_and_verify_state(pci_dev);
 569	pci_restore_state(pci_dev);
 570	pci_pme_restore(pci_dev);
 571}
 572
 573static void pci_pm_bridge_power_up_actions(struct pci_dev *pci_dev)
 574{
 575	int ret;
 576
 577	ret = pci_bridge_wait_for_secondary_bus(pci_dev, "resume");
 578	if (ret) {
 579		/*
 580		 * The downstream link failed to come up, so mark the
 581		 * devices below as disconnected to make sure we don't
 582		 * attempt to resume them.
 583		 */
 584		pci_walk_bus(pci_dev->subordinate, pci_dev_set_disconnected,
 585			     NULL);
 586		return;
 587	}
 588
 589	/*
 590	 * When powering on a bridge from D3cold, the whole hierarchy may be
 591	 * powered on into D0uninitialized state, resume them to give them a
 592	 * chance to suspend again
 593	 */
 594	pci_resume_bus(pci_dev->subordinate);
 595}
 596
 597#endif /* CONFIG_PM */
 598
 599#ifdef CONFIG_PM_SLEEP
 600
 601/*
 602 * Default "suspend" method for devices that have no driver provided suspend,
 603 * or not even a driver at all (second part).
 604 */
 605static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
 606{
 607	/*
 608	 * mark its power state as "unknown", since we don't know if
 609	 * e.g. the BIOS will change its device state when we suspend.
 610	 */
 611	if (pci_dev->current_state == PCI_D0)
 612		pci_dev->current_state = PCI_UNKNOWN;
 613}
 614
 615/*
 616 * Default "resume" method for devices that have no driver provided resume,
 617 * or not even a driver at all (second part).
 618 */
 619static int pci_pm_reenable_device(struct pci_dev *pci_dev)
 620{
 621	int retval;
 622
 623	/* if the device was enabled before suspend, re-enable */
 624	retval = pci_reenable_device(pci_dev);
 625	/*
 626	 * if the device was busmaster before the suspend, make it busmaster
 627	 * again
 628	 */
 629	if (pci_dev->is_busmaster)
 630		pci_set_master(pci_dev);
 631
 632	return retval;
 633}
 634
 635static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 636{
 637	struct pci_dev *pci_dev = to_pci_dev(dev);
 638	struct pci_driver *drv = pci_dev->driver;
 639
 640	if (drv && drv->suspend) {
 641		pci_power_t prev = pci_dev->current_state;
 642		int error;
 643
 644		error = drv->suspend(pci_dev, state);
 645		suspend_report_result(dev, drv->suspend, error);
 646		if (error)
 647			return error;
 648
 649		if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
 650		    && pci_dev->current_state != PCI_UNKNOWN) {
 651			pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
 652				      "PCI PM: Device state not saved by %pS\n",
 653				      drv->suspend);
 654		}
 655	}
 656
 657	pci_fixup_device(pci_fixup_suspend, pci_dev);
 658
 659	return 0;
 660}
 661
 662static int pci_legacy_suspend_late(struct device *dev)
 663{
 664	struct pci_dev *pci_dev = to_pci_dev(dev);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 665
 666	if (!pci_dev->state_saved)
 667		pci_save_state(pci_dev);
 668
 669	pci_pm_set_unknown_state(pci_dev);
 670
 671	pci_fixup_device(pci_fixup_suspend_late, pci_dev);
 672
 673	return 0;
 674}
 675
 
 
 
 
 
 
 
 
 
 676static int pci_legacy_resume(struct device *dev)
 677{
 678	struct pci_dev *pci_dev = to_pci_dev(dev);
 679	struct pci_driver *drv = pci_dev->driver;
 680
 681	pci_fixup_device(pci_fixup_resume, pci_dev);
 682
 683	return drv && drv->resume ?
 684			drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
 685}
 686
 687/* Auxiliary functions used by the new power management framework */
 688
 
 
 
 
 
 
 
 
 689static void pci_pm_default_suspend(struct pci_dev *pci_dev)
 690{
 691	/* Disable non-bridge devices without PM support */
 692	if (!pci_has_subordinate(pci_dev))
 693		pci_disable_enabled_device(pci_dev);
 694}
 695
 696static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
 697{
 698	struct pci_driver *drv = pci_dev->driver;
 699	bool ret = drv && (drv->suspend || drv->resume);
 
 700
 701	/*
 702	 * Legacy PM support is used by default, so warn if the new framework is
 703	 * supported as well.  Drivers are supposed to support either the
 704	 * former, or the latter, but not both at the same time.
 705	 */
 706	pci_WARN(pci_dev, ret && drv->driver.pm, "device %04x:%04x\n",
 707		 pci_dev->vendor, pci_dev->device);
 708
 709	return ret;
 710}
 711
 712/* New power management framework */
 713
 714static int pci_pm_prepare(struct device *dev)
 715{
 716	struct pci_dev *pci_dev = to_pci_dev(dev);
 717	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 718
 719	if (pm && pm->prepare) {
 720		int error = pm->prepare(dev);
 721		if (error < 0)
 722			return error;
 
 
 
 
 
 723
 724		if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
 725			return 0;
 
 726	}
 727	if (pci_dev_need_resume(pci_dev))
 728		return 0;
 729
 730	/*
 731	 * The PME setting needs to be adjusted here in case the direct-complete
 732	 * optimization is used with respect to this device.
 
 
 
 
 
 733	 */
 734	pci_dev_adjust_pme(pci_dev);
 735	return 1;
 
 
 
 
 736}
 737
 738static void pci_pm_complete(struct device *dev)
 739{
 740	struct pci_dev *pci_dev = to_pci_dev(dev);
 741
 742	pci_dev_complete_resume(pci_dev);
 743	pm_generic_complete(dev);
 744
 745	/* Resume device if platform firmware has put it in reset-power-on */
 746	if (pm_runtime_suspended(dev) && pm_resume_via_firmware()) {
 747		pci_power_t pre_sleep_state = pci_dev->current_state;
 748
 749		pci_refresh_power_state(pci_dev);
 750		/*
 751		 * On platforms with ACPI this check may also trigger for
 752		 * devices sharing power resources if one of those power
 753		 * resources has been activated as a result of a change of the
 754		 * power state of another device sharing it.  However, in that
 755		 * case it is also better to resume the device, in general.
 756		 */
 757		if (pci_dev->current_state < pre_sleep_state)
 758			pm_request_resume(dev);
 759	}
 760}
 761
 762#else /* !CONFIG_PM_SLEEP */
 763
 764#define pci_pm_prepare	NULL
 765#define pci_pm_complete	NULL
 766
 767#endif /* !CONFIG_PM_SLEEP */
 768
 769#ifdef CONFIG_SUSPEND
 770static void pcie_pme_root_status_cleanup(struct pci_dev *pci_dev)
 771{
 772	/*
 773	 * Some BIOSes forget to clear Root PME Status bits after system
 774	 * wakeup, which breaks ACPI-based runtime wakeup on PCI Express.
 775	 * Clear those bits now just in case (shouldn't hurt).
 776	 */
 777	if (pci_is_pcie(pci_dev) &&
 778	    (pci_pcie_type(pci_dev) == PCI_EXP_TYPE_ROOT_PORT ||
 779	     pci_pcie_type(pci_dev) == PCI_EXP_TYPE_RC_EC))
 780		pcie_clear_root_pme_status(pci_dev);
 781}
 782
 783static int pci_pm_suspend(struct device *dev)
 784{
 785	struct pci_dev *pci_dev = to_pci_dev(dev);
 786	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 787
 788	pci_dev->skip_bus_pm = false;
 789
 790	/*
 791	 * Disabling PTM allows some systems, e.g., Intel mobile chips
 792	 * since Coffee Lake, to enter a lower-power PM state.
 793	 */
 794	pci_suspend_ptm(pci_dev);
 795
 796	if (pci_has_legacy_pm_support(pci_dev))
 797		return pci_legacy_suspend(dev, PMSG_SUSPEND);
 798
 799	if (!pm) {
 800		pci_pm_default_suspend(pci_dev);
 801		return 0;
 802	}
 803
 804	/*
 805	 * PCI devices suspended at run time may need to be resumed at this
 806	 * point, because in general it may be necessary to reconfigure them for
 807	 * system suspend.  Namely, if the device is expected to wake up the
 808	 * system from the sleep state, it may have to be reconfigured for this
 809	 * purpose, or if the device is not expected to wake up the system from
 810	 * the sleep state, it should be prevented from signaling wakeup events
 811	 * going forward.
 812	 *
 813	 * Also if the driver of the device does not indicate that its system
 814	 * suspend callbacks can cope with runtime-suspended devices, it is
 815	 * better to resume the device from runtime suspend here.
 816	 */
 817	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
 818	    pci_dev_need_resume(pci_dev)) {
 819		pm_runtime_resume(dev);
 820		pci_dev->state_saved = false;
 821	} else {
 822		pci_dev_adjust_pme(pci_dev);
 823	}
 824
 825	if (pm->suspend) {
 826		pci_power_t prev = pci_dev->current_state;
 827		int error;
 828
 829		error = pm->suspend(dev);
 830		suspend_report_result(dev, pm->suspend, error);
 831		if (error)
 832			return error;
 833
 834		if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
 835		    && pci_dev->current_state != PCI_UNKNOWN) {
 836			pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
 837				      "PCI PM: State of device not saved by %pS\n",
 838				      pm->suspend);
 839		}
 840	}
 841
 842	return 0;
 843}
 844
 845static int pci_pm_suspend_late(struct device *dev)
 846{
 847	if (dev_pm_skip_suspend(dev))
 848		return 0;
 849
 850	pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
 851
 852	return pm_generic_suspend_late(dev);
 853}
 854
 855static int pci_pm_suspend_noirq(struct device *dev)
 856{
 857	struct pci_dev *pci_dev = to_pci_dev(dev);
 858	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 859
 860	if (dev_pm_skip_suspend(dev))
 861		return 0;
 862
 863	if (pci_has_legacy_pm_support(pci_dev))
 864		return pci_legacy_suspend_late(dev);
 865
 866	if (!pm) {
 867		pci_save_state(pci_dev);
 868		goto Fixup;
 869	}
 870
 871	if (pm->suspend_noirq) {
 872		pci_power_t prev = pci_dev->current_state;
 873		int error;
 874
 875		error = pm->suspend_noirq(dev);
 876		suspend_report_result(dev, pm->suspend_noirq, error);
 877		if (error)
 878			return error;
 879
 880		if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
 881		    && pci_dev->current_state != PCI_UNKNOWN) {
 882			pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
 883				      "PCI PM: State of device not saved by %pS\n",
 884				      pm->suspend_noirq);
 885			goto Fixup;
 886		}
 887	}
 888
 889	if (!pci_dev->state_saved) {
 890		pci_save_state(pci_dev);
 891
 892		/*
 893		 * If the device is a bridge with a child in D0 below it,
 894		 * it needs to stay in D0, so check skip_bus_pm to avoid
 895		 * putting it into a low-power state in that case.
 896		 */
 897		if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
 898			pci_prepare_to_sleep(pci_dev);
 899	}
 900
 901	pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
 902		pci_power_name(pci_dev->current_state));
 903
 904	if (pci_dev->current_state == PCI_D0) {
 905		pci_dev->skip_bus_pm = true;
 906		/*
 907		 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
 908		 * downstream device is in D0, so avoid changing the power state
 909		 * of the parent bridge by setting the skip_bus_pm flag for it.
 910		 */
 911		if (pci_dev->bus->self)
 912			pci_dev->bus->self->skip_bus_pm = true;
 913	}
 914
 915	if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
 916		pci_dbg(pci_dev, "PCI PM: Skipped\n");
 917		goto Fixup;
 918	}
 919
 920	pci_pm_set_unknown_state(pci_dev);
 921
 922	/*
 923	 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
 924	 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
 925	 * hasn't been quiesced and tries to turn it off.  If the controller
 926	 * is already in D3, this can hang or cause memory corruption.
 927	 *
 928	 * Since the value of the COMMAND register doesn't matter once the
 929	 * device has been suspended, we can safely set it to 0 here.
 930	 */
 931	if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
 932		pci_write_config_word(pci_dev, PCI_COMMAND, 0);
 933
 934Fixup:
 935	pci_fixup_device(pci_fixup_suspend_late, pci_dev);
 936
 937	/*
 938	 * If the target system sleep state is suspend-to-idle, it is sufficient
 939	 * to check whether or not the device's wakeup settings are good for
 940	 * runtime PM.  Otherwise, the pm_resume_via_firmware() check will cause
 941	 * pci_pm_complete() to take care of fixing up the device's state
 942	 * anyway, if need be.
 943	 */
 944	if (device_can_wakeup(dev) && !device_may_wakeup(dev))
 945		dev->power.may_skip_resume = false;
 946
 947	return 0;
 948}
 949
 950static int pci_pm_resume_noirq(struct device *dev)
 951{
 952	struct pci_dev *pci_dev = to_pci_dev(dev);
 953	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 954	pci_power_t prev_state = pci_dev->current_state;
 955	bool skip_bus_pm = pci_dev->skip_bus_pm;
 956
 957	if (dev_pm_skip_resume(dev))
 958		return 0;
 959
 960	/*
 961	 * In the suspend-to-idle case, devices left in D0 during suspend will
 962	 * stay in D0, so it is not necessary to restore or update their
 963	 * configuration here and attempting to put them into D0 again is
 964	 * pointless, so avoid doing that.
 965	 */
 966	if (!(skip_bus_pm && pm_suspend_no_platform()))
 967		pci_pm_default_resume_early(pci_dev);
 968
 969	pci_fixup_device(pci_fixup_resume_early, pci_dev);
 970	pcie_pme_root_status_cleanup(pci_dev);
 971
 972	if (!skip_bus_pm && prev_state == PCI_D3cold)
 973		pci_pm_bridge_power_up_actions(pci_dev);
 974
 975	if (pci_has_legacy_pm_support(pci_dev))
 976		return 0;
 977
 978	if (pm && pm->resume_noirq)
 979		return pm->resume_noirq(dev);
 980
 981	return 0;
 982}
 983
 984static int pci_pm_resume_early(struct device *dev)
 985{
 986	if (dev_pm_skip_resume(dev))
 987		return 0;
 988
 989	return pm_generic_resume_early(dev);
 990}
 991
 992static int pci_pm_resume(struct device *dev)
 993{
 994	struct pci_dev *pci_dev = to_pci_dev(dev);
 995	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
 996
 997	/*
 998	 * This is necessary for the suspend error path in which resume is
 999	 * called without restoring the standard config registers of the device.
1000	 */
1001	if (pci_dev->state_saved)
1002		pci_restore_standard_config(pci_dev);
1003
1004	pci_resume_ptm(pci_dev);
1005
1006	if (pci_has_legacy_pm_support(pci_dev))
1007		return pci_legacy_resume(dev);
1008
1009	pci_pm_default_resume(pci_dev);
1010
1011	if (pm) {
1012		if (pm->resume)
1013			return pm->resume(dev);
1014	} else {
1015		pci_pm_reenable_device(pci_dev);
1016	}
1017
1018	return 0;
1019}
1020
1021#else /* !CONFIG_SUSPEND */
1022
1023#define pci_pm_suspend		NULL
1024#define pci_pm_suspend_late	NULL
1025#define pci_pm_suspend_noirq	NULL
1026#define pci_pm_resume		NULL
1027#define pci_pm_resume_early	NULL
1028#define pci_pm_resume_noirq	NULL
1029
1030#endif /* !CONFIG_SUSPEND */
1031
1032#ifdef CONFIG_HIBERNATE_CALLBACKS
1033
1034static int pci_pm_freeze(struct device *dev)
1035{
1036	struct pci_dev *pci_dev = to_pci_dev(dev);
1037	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1038
1039	if (pci_has_legacy_pm_support(pci_dev))
1040		return pci_legacy_suspend(dev, PMSG_FREEZE);
1041
1042	if (!pm) {
1043		pci_pm_default_suspend(pci_dev);
1044		return 0;
1045	}
1046
1047	/*
1048	 * Resume all runtime-suspended devices before creating a snapshot
1049	 * image of system memory, because the restore kernel generally cannot
1050	 * be expected to always handle them consistently and they need to be
1051	 * put into the runtime-active metastate during system resume anyway,
1052	 * so it is better to ensure that the state saved in the image will be
1053	 * always consistent with that.
1054	 */
1055	pm_runtime_resume(dev);
1056	pci_dev->state_saved = false;
1057
1058	if (pm->freeze) {
1059		int error;
1060
1061		error = pm->freeze(dev);
1062		suspend_report_result(dev, pm->freeze, error);
1063		if (error)
1064			return error;
1065	}
1066
1067	return 0;
1068}
1069
1070static int pci_pm_freeze_noirq(struct device *dev)
1071{
1072	struct pci_dev *pci_dev = to_pci_dev(dev);
1073	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1074
1075	if (pci_has_legacy_pm_support(pci_dev))
1076		return pci_legacy_suspend_late(dev);
1077
1078	if (pm && pm->freeze_noirq) {
1079		int error;
1080
1081		error = pm->freeze_noirq(dev);
1082		suspend_report_result(dev, pm->freeze_noirq, error);
1083		if (error)
1084			return error;
1085	}
1086
1087	if (!pci_dev->state_saved)
1088		pci_save_state(pci_dev);
1089
1090	pci_pm_set_unknown_state(pci_dev);
1091
1092	return 0;
1093}
1094
1095static int pci_pm_thaw_noirq(struct device *dev)
1096{
1097	struct pci_dev *pci_dev = to_pci_dev(dev);
1098	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1099
1100	/*
1101	 * The pm->thaw_noirq() callback assumes the device has been
1102	 * returned to D0 and its config state has been restored.
1103	 *
1104	 * In addition, pci_restore_state() restores MSI-X state in MMIO
1105	 * space, which requires the device to be in D0, so return it to D0
1106	 * in case the driver's "freeze" callbacks put it into a low-power
1107	 * state.
1108	 */
1109	pci_pm_power_up_and_verify_state(pci_dev);
1110	pci_restore_state(pci_dev);
1111
1112	if (pci_has_legacy_pm_support(pci_dev))
1113		return 0;
1114
1115	if (pm && pm->thaw_noirq)
1116		return pm->thaw_noirq(dev);
1117
1118	return 0;
 
 
 
1119}
1120
1121static int pci_pm_thaw(struct device *dev)
1122{
1123	struct pci_dev *pci_dev = to_pci_dev(dev);
1124	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1125	int error = 0;
1126
1127	if (pci_has_legacy_pm_support(pci_dev))
1128		return pci_legacy_resume(dev);
1129
1130	if (pm) {
1131		if (pm->thaw)
1132			error = pm->thaw(dev);
1133	} else {
1134		pci_pm_reenable_device(pci_dev);
1135	}
1136
1137	pci_dev->state_saved = false;
1138
1139	return error;
1140}
1141
1142static int pci_pm_poweroff(struct device *dev)
1143{
1144	struct pci_dev *pci_dev = to_pci_dev(dev);
1145	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1146
1147	if (pci_has_legacy_pm_support(pci_dev))
1148		return pci_legacy_suspend(dev, PMSG_HIBERNATE);
1149
1150	if (!pm) {
1151		pci_pm_default_suspend(pci_dev);
1152		return 0;
1153	}
1154
1155	/* The reason to do that is the same as in pci_pm_suspend(). */
1156	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1157	    pci_dev_need_resume(pci_dev)) {
1158		pm_runtime_resume(dev);
1159		pci_dev->state_saved = false;
1160	} else {
1161		pci_dev_adjust_pme(pci_dev);
1162	}
1163
1164	if (pm->poweroff) {
1165		int error;
1166
1167		error = pm->poweroff(dev);
1168		suspend_report_result(dev, pm->poweroff, error);
1169		if (error)
1170			return error;
1171	}
1172
1173	return 0;
1174}
1175
1176static int pci_pm_poweroff_late(struct device *dev)
1177{
1178	if (dev_pm_skip_suspend(dev))
1179		return 0;
1180
1181	pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
1182
1183	return pm_generic_poweroff_late(dev);
1184}
1185
1186static int pci_pm_poweroff_noirq(struct device *dev)
1187{
1188	struct pci_dev *pci_dev = to_pci_dev(dev);
1189	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1190
1191	if (dev_pm_skip_suspend(dev))
1192		return 0;
1193
1194	if (pci_has_legacy_pm_support(pci_dev))
1195		return pci_legacy_suspend_late(dev);
1196
1197	if (!pm) {
1198		pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1199		return 0;
1200	}
1201
1202	if (pm->poweroff_noirq) {
1203		int error;
1204
1205		error = pm->poweroff_noirq(dev);
1206		suspend_report_result(dev, pm->poweroff_noirq, error);
1207		if (error)
1208			return error;
1209	}
1210
1211	if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1212		pci_prepare_to_sleep(pci_dev);
1213
1214	/*
1215	 * The reason for doing this here is the same as for the analogous code
1216	 * in pci_pm_suspend_noirq().
1217	 */
1218	if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1219		pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1220
1221	pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1222
1223	return 0;
1224}
1225
1226static int pci_pm_restore_noirq(struct device *dev)
1227{
1228	struct pci_dev *pci_dev = to_pci_dev(dev);
1229	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
1230
1231	pci_pm_default_resume_early(pci_dev);
1232	pci_fixup_device(pci_fixup_resume_early, pci_dev);
1233
1234	if (pci_has_legacy_pm_support(pci_dev))
1235		return 0;
1236
1237	if (pm && pm->restore_noirq)
1238		return pm->restore_noirq(dev);
1239
1240	return 0;
1241}
1242
1243static int pci_pm_restore(struct device *dev)
1244{
1245	struct pci_dev *pci_dev = to_pci_dev(dev);
1246	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
1247
1248	/*
1249	 * This is necessary for the hibernation error path in which restore is
1250	 * called without restoring the standard config registers of the device.
1251	 */
1252	if (pci_dev->state_saved)
1253		pci_restore_standard_config(pci_dev);
1254
1255	if (pci_has_legacy_pm_support(pci_dev))
1256		return pci_legacy_resume(dev);
1257
1258	pci_pm_default_resume(pci_dev);
1259
1260	if (pm) {
1261		if (pm->restore)
1262			return pm->restore(dev);
1263	} else {
1264		pci_pm_reenable_device(pci_dev);
1265	}
1266
1267	return 0;
1268}
1269
1270#else /* !CONFIG_HIBERNATE_CALLBACKS */
1271
1272#define pci_pm_freeze		NULL
1273#define pci_pm_freeze_noirq	NULL
1274#define pci_pm_thaw		NULL
1275#define pci_pm_thaw_noirq	NULL
1276#define pci_pm_poweroff		NULL
1277#define pci_pm_poweroff_late	NULL
1278#define pci_pm_poweroff_noirq	NULL
1279#define pci_pm_restore		NULL
1280#define pci_pm_restore_noirq	NULL
1281
1282#endif /* !CONFIG_HIBERNATE_CALLBACKS */
1283
1284#ifdef CONFIG_PM
1285
1286static int pci_pm_runtime_suspend(struct device *dev)
1287{
1288	struct pci_dev *pci_dev = to_pci_dev(dev);
1289	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1290	pci_power_t prev = pci_dev->current_state;
1291	int error;
1292
1293	pci_suspend_ptm(pci_dev);
1294
1295	/*
1296	 * If pci_dev->driver is not set (unbound), we leave the device in D0,
1297	 * but it may go to D3cold when the bridge above it runtime suspends.
1298	 * Save its config space in case that happens.
1299	 */
1300	if (!pci_dev->driver) {
1301		pci_save_state(pci_dev);
1302		return 0;
1303	}
1304
1305	pci_dev->state_saved = false;
1306	if (pm && pm->runtime_suspend) {
1307		error = pm->runtime_suspend(dev);
1308		/*
1309		 * -EBUSY and -EAGAIN is used to request the runtime PM core
1310		 * to schedule a new suspend, so log the event only with debug
1311		 * log level.
1312		 */
1313		if (error == -EBUSY || error == -EAGAIN) {
1314			pci_dbg(pci_dev, "can't suspend now (%ps returned %d)\n",
1315				pm->runtime_suspend, error);
1316			return error;
1317		} else if (error) {
1318			pci_err(pci_dev, "can't suspend (%ps returned %d)\n",
1319				pm->runtime_suspend, error);
1320			return error;
1321		}
1322	}
1323
1324	pci_fixup_device(pci_fixup_suspend, pci_dev);
1325
1326	if (pm && pm->runtime_suspend
1327	    && !pci_dev->state_saved && pci_dev->current_state != PCI_D0
1328	    && pci_dev->current_state != PCI_UNKNOWN) {
1329		pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
1330			      "PCI PM: State of device not saved by %pS\n",
1331			      pm->runtime_suspend);
1332		return 0;
1333	}
1334
1335	if (!pci_dev->state_saved) {
1336		pci_save_state(pci_dev);
1337		pci_finish_runtime_suspend(pci_dev);
1338	}
1339
1340	return 0;
1341}
1342
1343static int pci_pm_runtime_resume(struct device *dev)
1344{
1345	struct pci_dev *pci_dev = to_pci_dev(dev);
1346	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1347	pci_power_t prev_state = pci_dev->current_state;
1348	int error = 0;
1349
1350	/*
1351	 * Restoring config space is necessary even if the device is not bound
1352	 * to a driver because although we left it in D0, it may have gone to
1353	 * D3cold when the bridge above it runtime suspended.
1354	 */
1355	pci_pm_default_resume_early(pci_dev);
1356	pci_resume_ptm(pci_dev);
1357
1358	if (!pci_dev->driver)
1359		return 0;
1360
1361	pci_fixup_device(pci_fixup_resume_early, pci_dev);
1362	pci_pm_default_resume(pci_dev);
1363
1364	if (prev_state == PCI_D3cold)
1365		pci_pm_bridge_power_up_actions(pci_dev);
1366
1367	if (pm && pm->runtime_resume)
1368		error = pm->runtime_resume(dev);
 
1369
1370	return error;
1371}
1372
1373static int pci_pm_runtime_idle(struct device *dev)
1374{
1375	struct pci_dev *pci_dev = to_pci_dev(dev);
1376	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1377
1378	/*
1379	 * If pci_dev->driver is not set (unbound), the device should
1380	 * always remain in D0 regardless of the runtime PM status
1381	 */
1382	if (!pci_dev->driver)
1383		return 0;
1384
1385	if (!pm)
1386		return -ENOSYS;
1387
1388	if (pm->runtime_idle)
1389		return pm->runtime_idle(dev);
 
 
 
 
 
1390
1391	return 0;
1392}
1393
1394static const struct dev_pm_ops pci_dev_pm_ops = {
 
 
 
 
 
 
 
 
 
 
1395	.prepare = pci_pm_prepare,
1396	.complete = pci_pm_complete,
1397	.suspend = pci_pm_suspend,
1398	.suspend_late = pci_pm_suspend_late,
1399	.resume = pci_pm_resume,
1400	.resume_early = pci_pm_resume_early,
1401	.freeze = pci_pm_freeze,
1402	.thaw = pci_pm_thaw,
1403	.poweroff = pci_pm_poweroff,
1404	.poweroff_late = pci_pm_poweroff_late,
1405	.restore = pci_pm_restore,
1406	.suspend_noirq = pci_pm_suspend_noirq,
1407	.resume_noirq = pci_pm_resume_noirq,
1408	.freeze_noirq = pci_pm_freeze_noirq,
1409	.thaw_noirq = pci_pm_thaw_noirq,
1410	.poweroff_noirq = pci_pm_poweroff_noirq,
1411	.restore_noirq = pci_pm_restore_noirq,
1412	.runtime_suspend = pci_pm_runtime_suspend,
1413	.runtime_resume = pci_pm_runtime_resume,
1414	.runtime_idle = pci_pm_runtime_idle,
1415};
1416
1417#define PCI_PM_OPS_PTR	(&pci_dev_pm_ops)
1418
1419#else /* !CONFIG_PM */
1420
1421#define pci_pm_runtime_suspend	NULL
1422#define pci_pm_runtime_resume	NULL
1423#define pci_pm_runtime_idle	NULL
1424
1425#define PCI_PM_OPS_PTR	NULL
1426
1427#endif /* !CONFIG_PM */
1428
1429/**
1430 * __pci_register_driver - register a new pci driver
1431 * @drv: the driver structure to register
1432 * @owner: owner module of drv
1433 * @mod_name: module name string
1434 *
1435 * Adds the driver structure to the list of registered drivers.
1436 * Returns a negative value on error, otherwise 0.
1437 * If no error occurred, the driver remains registered even if
1438 * no device was claimed during registration.
1439 */
1440int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1441			  const char *mod_name)
1442{
 
 
1443	/* initialize common driver fields */
1444	drv->driver.name = drv->name;
1445	drv->driver.bus = &pci_bus_type;
1446	drv->driver.owner = owner;
1447	drv->driver.mod_name = mod_name;
1448	drv->driver.groups = drv->groups;
1449	drv->driver.dev_groups = drv->dev_groups;
1450
1451	spin_lock_init(&drv->dynids.lock);
1452	INIT_LIST_HEAD(&drv->dynids.list);
1453
1454	/* register with core */
1455	return driver_register(&drv->driver);
 
 
 
 
 
 
 
 
 
 
 
 
1456}
1457EXPORT_SYMBOL(__pci_register_driver);
1458
1459/**
1460 * pci_unregister_driver - unregister a pci driver
1461 * @drv: the driver structure to unregister
1462 *
1463 * Deletes the driver structure from the list of registered PCI drivers,
1464 * gives it a chance to clean up by calling its remove() function for
1465 * each device it was responsible for, and marks those devices as
1466 * driverless.
1467 */
1468
1469void pci_unregister_driver(struct pci_driver *drv)
 
1470{
 
1471	driver_unregister(&drv->driver);
1472	pci_free_dynids(drv);
1473}
1474EXPORT_SYMBOL(pci_unregister_driver);
1475
1476static struct pci_driver pci_compat_driver = {
1477	.name = "compat"
1478};
1479
1480/**
1481 * pci_dev_driver - get the pci_driver of a device
1482 * @dev: the device to query
1483 *
1484 * Returns the appropriate pci_driver structure or %NULL if there is no
1485 * registered driver for the device.
1486 */
1487struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
 
1488{
1489	int i;
1490
1491	if (dev->driver)
1492		return dev->driver;
1493
1494	for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1495		if (dev->resource[i].flags & IORESOURCE_BUSY)
1496			return &pci_compat_driver;
1497
 
1498	return NULL;
1499}
1500EXPORT_SYMBOL(pci_dev_driver);
1501
1502/**
1503 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1504 * @dev: the PCI device structure to match against
1505 * @drv: the device driver to search for matching PCI device id structures
1506 *
1507 * Used by a driver to check whether a PCI device present in the
1508 * system is in its list of supported devices. Returns the matching
1509 * pci_device_id structure or %NULL if there is no match.
1510 */
1511static int pci_bus_match(struct device *dev, struct device_driver *drv)
1512{
1513	struct pci_dev *pci_dev = to_pci_dev(dev);
1514	struct pci_driver *pci_drv;
1515	const struct pci_device_id *found_id;
1516
1517	if (!pci_dev->match_driver)
1518		return 0;
1519
1520	pci_drv = to_pci_driver(drv);
1521	found_id = pci_match_device(pci_drv, pci_dev);
1522	if (found_id)
1523		return 1;
1524
1525	return 0;
1526}
1527
1528/**
1529 * pci_dev_get - increments the reference count of the pci device structure
1530 * @dev: the device being referenced
1531 *
1532 * Each live reference to a device should be refcounted.
1533 *
1534 * Drivers for PCI devices should normally record such references in
1535 * their probe() methods, when they bind to a device, and release
1536 * them by calling pci_dev_put(), in their disconnect() methods.
1537 *
1538 * A pointer to the device with the incremented reference counter is returned.
1539 */
1540struct pci_dev *pci_dev_get(struct pci_dev *dev)
1541{
1542	if (dev)
1543		get_device(&dev->dev);
1544	return dev;
1545}
1546EXPORT_SYMBOL(pci_dev_get);
1547
1548/**
1549 * pci_dev_put - release a use of the pci device structure
1550 * @dev: device that's been disconnected
1551 *
1552 * Must be called when a user of a device is finished with it.  When the last
1553 * user of the device calls this function, the memory of the device is freed.
1554 */
1555void pci_dev_put(struct pci_dev *dev)
1556{
1557	if (dev)
1558		put_device(&dev->dev);
1559}
1560EXPORT_SYMBOL(pci_dev_put);
1561
1562static int pci_uevent(const struct device *dev, struct kobj_uevent_env *env)
1563{
1564	const struct pci_dev *pdev;
1565
1566	if (!dev)
1567		return -ENODEV;
1568
1569	pdev = to_pci_dev(dev);
1570
1571	if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1572		return -ENOMEM;
1573
1574	if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1575		return -ENOMEM;
1576
1577	if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1578			   pdev->subsystem_device))
1579		return -ENOMEM;
1580
1581	if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1582		return -ENOMEM;
1583
1584	if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02X",
1585			   pdev->vendor, pdev->device,
1586			   pdev->subsystem_vendor, pdev->subsystem_device,
1587			   (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1588			   (u8)(pdev->class)))
1589		return -ENOMEM;
1590
1591	return 0;
1592}
1593
1594#if defined(CONFIG_PCIEAER) || defined(CONFIG_EEH)
1595/**
1596 * pci_uevent_ers - emit a uevent during recovery path of PCI device
1597 * @pdev: PCI device undergoing error recovery
1598 * @err_type: type of error event
1599 */
1600void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type)
1601{
1602	int idx = 0;
1603	char *envp[3];
1604
1605	switch (err_type) {
1606	case PCI_ERS_RESULT_NONE:
1607	case PCI_ERS_RESULT_CAN_RECOVER:
1608		envp[idx++] = "ERROR_EVENT=BEGIN_RECOVERY";
1609		envp[idx++] = "DEVICE_ONLINE=0";
1610		break;
1611	case PCI_ERS_RESULT_RECOVERED:
1612		envp[idx++] = "ERROR_EVENT=SUCCESSFUL_RECOVERY";
1613		envp[idx++] = "DEVICE_ONLINE=1";
1614		break;
1615	case PCI_ERS_RESULT_DISCONNECT:
1616		envp[idx++] = "ERROR_EVENT=FAILED_RECOVERY";
1617		envp[idx++] = "DEVICE_ONLINE=0";
1618		break;
1619	default:
1620		break;
1621	}
1622
1623	if (idx > 0) {
1624		envp[idx++] = NULL;
1625		kobject_uevent_env(&pdev->dev.kobj, KOBJ_CHANGE, envp);
1626	}
1627}
1628#endif
1629
1630static int pci_bus_num_vf(struct device *dev)
1631{
1632	return pci_num_vf(to_pci_dev(dev));
1633}
1634
1635/**
1636 * pci_dma_configure - Setup DMA configuration
1637 * @dev: ptr to dev structure
1638 *
1639 * Function to update PCI devices's DMA configuration using the same
1640 * info from the OF node or ACPI node of host bridge's parent (if any).
1641 */
1642static int pci_dma_configure(struct device *dev)
1643{
1644	struct pci_driver *driver = to_pci_driver(dev->driver);
1645	struct device *bridge;
1646	int ret = 0;
1647
1648	bridge = pci_get_host_bridge_device(to_pci_dev(dev));
1649
1650	if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
1651	    bridge->parent->of_node) {
1652		ret = of_dma_configure(dev, bridge->parent->of_node, true);
1653	} else if (has_acpi_companion(bridge)) {
1654		struct acpi_device *adev = to_acpi_device_node(bridge->fwnode);
1655
1656		ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev));
1657	}
1658
1659	pci_put_host_bridge_device(bridge);
1660
1661	if (!ret && !driver->driver_managed_dma) {
1662		ret = iommu_device_use_default_domain(dev);
1663		if (ret)
1664			arch_teardown_dma_ops(dev);
1665	}
1666
1667	return ret;
1668}
1669
1670static void pci_dma_cleanup(struct device *dev)
1671{
1672	struct pci_driver *driver = to_pci_driver(dev->driver);
1673
1674	if (!driver->driver_managed_dma)
1675		iommu_device_unuse_default_domain(dev);
1676}
1677
1678struct bus_type pci_bus_type = {
1679	.name		= "pci",
1680	.match		= pci_bus_match,
1681	.uevent		= pci_uevent,
1682	.probe		= pci_device_probe,
1683	.remove		= pci_device_remove,
1684	.shutdown	= pci_device_shutdown,
1685	.dev_groups	= pci_dev_groups,
1686	.bus_groups	= pci_bus_groups,
1687	.drv_groups	= pci_drv_groups,
1688	.pm		= PCI_PM_OPS_PTR,
1689	.num_vf		= pci_bus_num_vf,
1690	.dma_configure	= pci_dma_configure,
1691	.dma_cleanup	= pci_dma_cleanup,
1692};
1693EXPORT_SYMBOL(pci_bus_type);
1694
1695#ifdef CONFIG_PCIEPORTBUS
1696static int pcie_port_bus_match(struct device *dev, struct device_driver *drv)
1697{
1698	struct pcie_device *pciedev;
1699	struct pcie_port_service_driver *driver;
1700
1701	if (drv->bus != &pcie_port_bus_type || dev->bus != &pcie_port_bus_type)
1702		return 0;
1703
1704	pciedev = to_pcie_device(dev);
1705	driver = to_service_driver(drv);
1706
1707	if (driver->service != pciedev->service)
1708		return 0;
1709
1710	if (driver->port_type != PCIE_ANY_PORT &&
1711	    driver->port_type != pci_pcie_type(pciedev->port))
1712		return 0;
1713
1714	return 1;
1715}
1716
1717struct bus_type pcie_port_bus_type = {
1718	.name		= "pci_express",
1719	.match		= pcie_port_bus_match,
1720};
1721#endif
1722
1723static int __init pci_driver_init(void)
1724{
1725	int ret;
1726
1727	ret = bus_register(&pci_bus_type);
1728	if (ret)
1729		return ret;
1730
1731#ifdef CONFIG_PCIEPORTBUS
1732	ret = bus_register(&pcie_port_bus_type);
1733	if (ret)
1734		return ret;
1735#endif
1736	dma_debug_add_bus(&pci_bus_type);
1737	return 0;
1738}
 
1739postcore_initcall(pci_driver_init);