2 * drivers/pci/pci-driver.c
4 * (C) Copyright 2002-2004, 2007 Greg Kroah-Hartman <greg@kroah.com>
5 * (C) Copyright 2007 Novell Inc.
7 * Released under the GPL v2 only.
11 #include <linux/pci.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/mempolicy.h>
16 #include <linux/string.h>
17 #include <linux/slab.h>
18 #include <linux/sched.h>
19 #include <linux/cpu.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/suspend.h>
25 struct list_head node;
26 struct pci_device_id id;
30 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
31 * @drv: target pci driver
32 * @vendor: PCI vendor ID
33 * @device: PCI device ID
34 * @subvendor: PCI subvendor ID
35 * @subdevice: PCI subdevice ID
37 * @class_mask: PCI class mask
38 * @driver_data: private driver data
40 * Adds a new dynamic pci device ID to this driver and causes the
41 * driver to probe for all devices again. @drv must have been
42 * registered prior to calling this function.
45 * Does GFP_KERNEL allocation.
48 * 0 on success, -errno on failure.
50 int pci_add_dynid(struct pci_driver *drv,
51 unsigned int vendor, unsigned int device,
52 unsigned int subvendor, unsigned int subdevice,
53 unsigned int class, unsigned int class_mask,
54 unsigned long driver_data)
56 struct pci_dynid *dynid;
59 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
63 dynid->id.vendor = vendor;
64 dynid->id.device = device;
65 dynid->id.subvendor = subvendor;
66 dynid->id.subdevice = subdevice;
67 dynid->id.class = class;
68 dynid->id.class_mask = class_mask;
69 dynid->id.driver_data = driver_data;
71 spin_lock(&drv->dynids.lock);
72 list_add_tail(&dynid->node, &drv->dynids.list);
73 spin_unlock(&drv->dynids.lock);
75 retval = driver_attach(&drv->driver);
80 static void pci_free_dynids(struct pci_driver *drv)
82 struct pci_dynid *dynid, *n;
84 spin_lock(&drv->dynids.lock);
85 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
86 list_del(&dynid->node);
89 spin_unlock(&drv->dynids.lock);
93 * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG
97 * store_new_id - sysfs frontend to pci_add_dynid()
98 * @driver: target device driver
99 * @buf: buffer for scanning device ID data
102 * Allow PCI IDs to be added to an existing driver via sysfs.
105 store_new_id(struct device_driver *driver, const char *buf, size_t count)
107 struct pci_driver *pdrv = to_pci_driver(driver);
108 const struct pci_device_id *ids = pdrv->id_table;
109 __u32 vendor, device, subvendor=PCI_ANY_ID,
110 subdevice=PCI_ANY_ID, class=0, class_mask=0;
111 unsigned long driver_data=0;
115 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
116 &vendor, &device, &subvendor, &subdevice,
117 &class, &class_mask, &driver_data);
121 /* Only accept driver_data values that match an existing id_table
125 while (ids->vendor || ids->subvendor || ids->class_mask) {
126 if (driver_data == ids->driver_data) {
132 if (retval) /* No match */
136 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
137 class, class_mask, driver_data);
144 * store_remove_id - remove a PCI device ID from this driver
145 * @driver: target device driver
146 * @buf: buffer for scanning device ID data
149 * Removes a dynamic pci device ID to this driver.
152 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
154 struct pci_dynid *dynid, *n;
155 struct pci_driver *pdrv = to_pci_driver(driver);
156 __u32 vendor, device, subvendor = PCI_ANY_ID,
157 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
159 int retval = -ENODEV;
161 fields = sscanf(buf, "%x %x %x %x %x %x",
162 &vendor, &device, &subvendor, &subdevice,
163 &class, &class_mask);
167 spin_lock(&pdrv->dynids.lock);
168 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
169 struct pci_device_id *id = &dynid->id;
170 if ((id->vendor == vendor) &&
171 (id->device == device) &&
172 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
173 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
174 !((id->class ^ class) & class_mask)) {
175 list_del(&dynid->node);
181 spin_unlock(&pdrv->dynids.lock);
188 static struct driver_attribute pci_drv_attrs[] = {
189 __ATTR(new_id, S_IWUSR, NULL, store_new_id),
190 __ATTR(remove_id, S_IWUSR, NULL, store_remove_id),
195 #define pci_drv_attrs NULL
196 #endif /* CONFIG_HOTPLUG */
199 * pci_match_id - See if a pci device matches a given pci_id table
200 * @ids: array of PCI device id structures to search in
201 * @dev: the PCI device structure to match against.
203 * Used by a driver to check whether a PCI device present in the
204 * system is in its list of supported devices. Returns the matching
205 * pci_device_id structure or %NULL if there is no match.
207 * Deprecated, don't use this as it will not catch any dynamic ids
208 * that a driver might want to check for.
210 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
214 while (ids->vendor || ids->subvendor || ids->class_mask) {
215 if (pci_match_one_device(ids, dev))
224 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
225 * @drv: the PCI driver to match against
226 * @dev: the PCI device structure to match against
228 * Used by a driver to check whether a PCI device present in the
229 * system is in its list of supported devices. Returns the matching
230 * pci_device_id structure or %NULL if there is no match.
232 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
235 struct pci_dynid *dynid;
237 /* Look at the dynamic ids first, before the static ones */
238 spin_lock(&drv->dynids.lock);
239 list_for_each_entry(dynid, &drv->dynids.list, node) {
240 if (pci_match_one_device(&dynid->id, dev)) {
241 spin_unlock(&drv->dynids.lock);
245 spin_unlock(&drv->dynids.lock);
247 return pci_match_id(drv->id_table, dev);
250 struct drv_dev_and_id {
251 struct pci_driver *drv;
253 const struct pci_device_id *id;
256 static long local_pci_probe(void *_ddi)
258 struct drv_dev_and_id *ddi = _ddi;
259 struct device *dev = &ddi->dev->dev;
260 struct device *parent = dev->parent;
263 /* The parent bridge must be in active state when probing */
265 pm_runtime_get_sync(parent);
266 /* Unbound PCI devices are always set to disabled and suspended.
267 * During probe, the device is set to enabled and active and the
268 * usage count is incremented. If the driver supports runtime PM,
269 * it should call pm_runtime_put_noidle() in its probe routine and
270 * pm_runtime_get_noresume() in its remove routine.
272 pm_runtime_get_noresume(dev);
273 pm_runtime_set_active(dev);
274 pm_runtime_enable(dev);
276 rc = ddi->drv->probe(ddi->dev, ddi->id);
278 pm_runtime_disable(dev);
279 pm_runtime_set_suspended(dev);
280 pm_runtime_put_noidle(dev);
283 pm_runtime_put(parent);
287 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
288 const struct pci_device_id *id)
291 struct drv_dev_and_id ddi = { drv, dev, id };
293 /* Execute driver initialization on node where the device's
294 bus is attached to. This way the driver likely allocates
295 its local memory on the right node without any need to
297 node = dev_to_node(&dev->dev);
302 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
303 if (cpu < nr_cpu_ids)
304 error = work_on_cpu(cpu, local_pci_probe, &ddi);
306 error = local_pci_probe(&ddi);
309 error = local_pci_probe(&ddi);
314 * __pci_device_probe - check if a driver wants to claim a specific PCI device
315 * @drv: driver to call to check if it wants the PCI device
316 * @pci_dev: PCI device being probed
318 * returns 0 on success, else error.
319 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
322 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
324 const struct pci_device_id *id;
327 if (!pci_dev->driver && drv->probe) {
330 id = pci_match_device(drv, pci_dev);
332 error = pci_call_probe(drv, pci_dev, id);
334 pci_dev->driver = drv;
341 static int pci_device_probe(struct device * dev)
344 struct pci_driver *drv;
345 struct pci_dev *pci_dev;
347 drv = to_pci_driver(dev->driver);
348 pci_dev = to_pci_dev(dev);
349 pci_dev_get(pci_dev);
350 error = __pci_device_probe(drv, pci_dev);
352 pci_dev_put(pci_dev);
357 static int pci_device_remove(struct device * dev)
359 struct pci_dev * pci_dev = to_pci_dev(dev);
360 struct pci_driver * drv = pci_dev->driver;
364 pm_runtime_get_sync(dev);
365 drv->remove(pci_dev);
366 pm_runtime_put_noidle(dev);
368 pci_dev->driver = NULL;
371 /* Undo the runtime PM settings in local_pci_probe() */
372 pm_runtime_disable(dev);
373 pm_runtime_set_suspended(dev);
374 pm_runtime_put_noidle(dev);
377 * If the device is still on, set the power state as "unknown",
378 * since it might change by the next time we load the driver.
380 if (pci_dev->current_state == PCI_D0)
381 pci_dev->current_state = PCI_UNKNOWN;
384 * We would love to complain here if pci_dev->is_enabled is set, that
385 * the driver should have called pci_disable_device(), but the
386 * unfortunate fact is there are too many odd BIOS and bridge setups
387 * that don't like drivers doing that all of the time.
388 * Oh well, we can dream of sane hardware when we sleep, no matter how
389 * horrible the crap we have to deal with is when we are awake...
392 pci_dev_put(pci_dev);
396 static void pci_device_shutdown(struct device *dev)
398 struct pci_dev *pci_dev = to_pci_dev(dev);
399 struct pci_driver *drv = pci_dev->driver;
401 if (drv && drv->shutdown)
402 drv->shutdown(pci_dev);
403 pci_msi_shutdown(pci_dev);
404 pci_msix_shutdown(pci_dev);
407 * Turn off Bus Master bit on the device to tell it to not
410 pci_disable_device(pci_dev);
413 * Devices may be enabled to wake up by runtime PM, but they need not
414 * be supposed to wake up the system from its "power off" state (e.g.
415 * ACPI S5). Therefore disable wakeup for all devices that aren't
416 * supposed to wake up the system at this point. The state argument
417 * will be ignored by pci_enable_wake().
419 if (!device_may_wakeup(dev))
420 pci_enable_wake(pci_dev, PCI_UNKNOWN, false);
425 /* Auxiliary functions used for system resume and run-time resume. */
428 * pci_restore_standard_config - restore standard config registers of PCI device
429 * @pci_dev: PCI device to handle
431 static int pci_restore_standard_config(struct pci_dev *pci_dev)
433 pci_update_current_state(pci_dev, PCI_UNKNOWN);
435 if (pci_dev->current_state != PCI_D0) {
436 int error = pci_set_power_state(pci_dev, PCI_D0);
441 pci_restore_state(pci_dev);
447 #ifdef CONFIG_PM_SLEEP
449 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
451 pci_power_up(pci_dev);
452 pci_restore_state(pci_dev);
453 pci_fixup_device(pci_fixup_resume_early, pci_dev);
457 * Default "suspend" method for devices that have no driver provided suspend,
458 * or not even a driver at all (second part).
460 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
463 * mark its power state as "unknown", since we don't know if
464 * e.g. the BIOS will change its device state when we suspend.
466 if (pci_dev->current_state == PCI_D0)
467 pci_dev->current_state = PCI_UNKNOWN;
471 * Default "resume" method for devices that have no driver provided resume,
472 * or not even a driver at all (second part).
474 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
478 /* if the device was enabled before suspend, reenable */
479 retval = pci_reenable_device(pci_dev);
481 * if the device was busmaster before the suspend, make it busmaster
484 if (pci_dev->is_busmaster)
485 pci_set_master(pci_dev);
490 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
492 struct pci_dev * pci_dev = to_pci_dev(dev);
493 struct pci_driver * drv = pci_dev->driver;
495 if (drv && drv->suspend) {
496 pci_power_t prev = pci_dev->current_state;
499 error = drv->suspend(pci_dev, state);
500 suspend_report_result(drv->suspend, error);
504 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
505 && pci_dev->current_state != PCI_UNKNOWN) {
506 WARN_ONCE(pci_dev->current_state != prev,
507 "PCI PM: Device state not saved by %pF\n",
512 pci_fixup_device(pci_fixup_suspend, pci_dev);
517 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
519 struct pci_dev * pci_dev = to_pci_dev(dev);
520 struct pci_driver * drv = pci_dev->driver;
522 if (drv && drv->suspend_late) {
523 pci_power_t prev = pci_dev->current_state;
526 error = drv->suspend_late(pci_dev, state);
527 suspend_report_result(drv->suspend_late, error);
531 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
532 && pci_dev->current_state != PCI_UNKNOWN) {
533 WARN_ONCE(pci_dev->current_state != prev,
534 "PCI PM: Device state not saved by %pF\n",
540 if (!pci_dev->state_saved)
541 pci_save_state(pci_dev);
543 pci_pm_set_unknown_state(pci_dev);
548 static int pci_legacy_resume_early(struct device *dev)
550 struct pci_dev * pci_dev = to_pci_dev(dev);
551 struct pci_driver * drv = pci_dev->driver;
553 return drv && drv->resume_early ?
554 drv->resume_early(pci_dev) : 0;
557 static int pci_legacy_resume(struct device *dev)
559 struct pci_dev * pci_dev = to_pci_dev(dev);
560 struct pci_driver * drv = pci_dev->driver;
562 pci_fixup_device(pci_fixup_resume, pci_dev);
564 return drv && drv->resume ?
565 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
568 /* Auxiliary functions used by the new power management framework */
570 static void pci_pm_default_resume(struct pci_dev *pci_dev)
572 pci_fixup_device(pci_fixup_resume, pci_dev);
574 if (!pci_is_bridge(pci_dev))
575 pci_enable_wake(pci_dev, PCI_D0, false);
578 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
580 /* Disable non-bridge devices without PM support */
581 if (!pci_is_bridge(pci_dev))
582 pci_disable_enabled_device(pci_dev);
585 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
587 struct pci_driver *drv = pci_dev->driver;
588 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
589 || drv->resume_early);
592 * Legacy PM support is used by default, so warn if the new framework is
593 * supported as well. Drivers are supposed to support either the
594 * former, or the latter, but not both at the same time.
596 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
597 drv->name, pci_dev->vendor, pci_dev->device);
602 /* New power management framework */
604 static int pci_pm_prepare(struct device *dev)
606 struct device_driver *drv = dev->driver;
610 * If a PCI device configured to wake up the system from sleep states
611 * has been suspended at run time and there's a resume request pending
612 * for it, this is equivalent to the device signaling wakeup, so the
613 * system suspend operation should be aborted.
615 pm_runtime_get_noresume(dev);
616 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
617 pm_wakeup_event(dev, 0);
619 if (pm_wakeup_pending()) {
620 pm_runtime_put_sync(dev);
625 * PCI devices suspended at run time need to be resumed at this
626 * point, because in general it is necessary to reconfigure them for
627 * system suspend. Namely, if the device is supposed to wake up the
628 * system from the sleep state, we may need to reconfigure it for this
629 * purpose. In turn, if the device is not supposed to wake up the
630 * system from the sleep state, we'll have to prevent it from signaling
633 pm_runtime_resume(dev);
635 if (drv && drv->pm && drv->pm->prepare)
636 error = drv->pm->prepare(dev);
641 static void pci_pm_complete(struct device *dev)
643 struct device_driver *drv = dev->driver;
645 if (drv && drv->pm && drv->pm->complete)
646 drv->pm->complete(dev);
648 pm_runtime_put_sync(dev);
651 #else /* !CONFIG_PM_SLEEP */
653 #define pci_pm_prepare NULL
654 #define pci_pm_complete NULL
656 #endif /* !CONFIG_PM_SLEEP */
658 #ifdef CONFIG_SUSPEND
660 static int pci_pm_suspend(struct device *dev)
662 struct pci_dev *pci_dev = to_pci_dev(dev);
663 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
665 if (pci_has_legacy_pm_support(pci_dev))
666 return pci_legacy_suspend(dev, PMSG_SUSPEND);
669 pci_pm_default_suspend(pci_dev);
674 pci_power_t prev = pci_dev->current_state;
677 error = pm->suspend(dev);
678 suspend_report_result(pm->suspend, error);
682 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
683 && pci_dev->current_state != PCI_UNKNOWN) {
684 WARN_ONCE(pci_dev->current_state != prev,
685 "PCI PM: State of device not saved by %pF\n",
691 pci_fixup_device(pci_fixup_suspend, pci_dev);
696 static int pci_pm_suspend_noirq(struct device *dev)
698 struct pci_dev *pci_dev = to_pci_dev(dev);
699 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
701 if (pci_has_legacy_pm_support(pci_dev))
702 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
705 pci_save_state(pci_dev);
709 if (pm->suspend_noirq) {
710 pci_power_t prev = pci_dev->current_state;
713 error = pm->suspend_noirq(dev);
714 suspend_report_result(pm->suspend_noirq, error);
718 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
719 && pci_dev->current_state != PCI_UNKNOWN) {
720 WARN_ONCE(pci_dev->current_state != prev,
721 "PCI PM: State of device not saved by %pF\n",
727 if (!pci_dev->state_saved) {
728 pci_save_state(pci_dev);
729 if (!pci_is_bridge(pci_dev))
730 pci_prepare_to_sleep(pci_dev);
733 pci_pm_set_unknown_state(pci_dev);
736 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
737 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
738 * hasn't been quiesced and tries to turn it off. If the controller
739 * is already in D3, this can hang or cause memory corruption.
741 * Since the value of the COMMAND register doesn't matter once the
742 * device has been suspended, we can safely set it to 0 here.
744 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
745 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
750 static int pci_pm_resume_noirq(struct device *dev)
752 struct pci_dev *pci_dev = to_pci_dev(dev);
753 struct device_driver *drv = dev->driver;
756 pci_pm_default_resume_early(pci_dev);
758 if (pci_has_legacy_pm_support(pci_dev))
759 return pci_legacy_resume_early(dev);
761 if (drv && drv->pm && drv->pm->resume_noirq)
762 error = drv->pm->resume_noirq(dev);
767 static int pci_pm_resume(struct device *dev)
769 struct pci_dev *pci_dev = to_pci_dev(dev);
770 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
774 * This is necessary for the suspend error path in which resume is
775 * called without restoring the standard config registers of the device.
777 if (pci_dev->state_saved)
778 pci_restore_standard_config(pci_dev);
780 if (pci_has_legacy_pm_support(pci_dev))
781 return pci_legacy_resume(dev);
783 pci_pm_default_resume(pci_dev);
787 error = pm->resume(dev);
789 pci_pm_reenable_device(pci_dev);
795 #else /* !CONFIG_SUSPEND */
797 #define pci_pm_suspend NULL
798 #define pci_pm_suspend_noirq NULL
799 #define pci_pm_resume NULL
800 #define pci_pm_resume_noirq NULL
802 #endif /* !CONFIG_SUSPEND */
804 #ifdef CONFIG_HIBERNATE_CALLBACKS
806 static int pci_pm_freeze(struct device *dev)
808 struct pci_dev *pci_dev = to_pci_dev(dev);
809 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
811 if (pci_has_legacy_pm_support(pci_dev))
812 return pci_legacy_suspend(dev, PMSG_FREEZE);
815 pci_pm_default_suspend(pci_dev);
822 error = pm->freeze(dev);
823 suspend_report_result(pm->freeze, error);
831 static int pci_pm_freeze_noirq(struct device *dev)
833 struct pci_dev *pci_dev = to_pci_dev(dev);
834 struct device_driver *drv = dev->driver;
836 if (pci_has_legacy_pm_support(pci_dev))
837 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
839 if (drv && drv->pm && drv->pm->freeze_noirq) {
842 error = drv->pm->freeze_noirq(dev);
843 suspend_report_result(drv->pm->freeze_noirq, error);
848 if (!pci_dev->state_saved)
849 pci_save_state(pci_dev);
851 pci_pm_set_unknown_state(pci_dev);
856 static int pci_pm_thaw_noirq(struct device *dev)
858 struct pci_dev *pci_dev = to_pci_dev(dev);
859 struct device_driver *drv = dev->driver;
862 if (pci_has_legacy_pm_support(pci_dev))
863 return pci_legacy_resume_early(dev);
865 pci_update_current_state(pci_dev, PCI_D0);
867 if (drv && drv->pm && drv->pm->thaw_noirq)
868 error = drv->pm->thaw_noirq(dev);
873 static int pci_pm_thaw(struct device *dev)
875 struct pci_dev *pci_dev = to_pci_dev(dev);
876 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
879 if (pci_has_legacy_pm_support(pci_dev))
880 return pci_legacy_resume(dev);
884 error = pm->thaw(dev);
886 pci_pm_reenable_device(pci_dev);
889 pci_dev->state_saved = false;
894 static int pci_pm_poweroff(struct device *dev)
896 struct pci_dev *pci_dev = to_pci_dev(dev);
897 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
899 if (pci_has_legacy_pm_support(pci_dev))
900 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
903 pci_pm_default_suspend(pci_dev);
910 error = pm->poweroff(dev);
911 suspend_report_result(pm->poweroff, error);
917 pci_fixup_device(pci_fixup_suspend, pci_dev);
922 static int pci_pm_poweroff_noirq(struct device *dev)
924 struct pci_dev *pci_dev = to_pci_dev(dev);
925 struct device_driver *drv = dev->driver;
927 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
928 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
930 if (!drv || !drv->pm)
933 if (drv->pm->poweroff_noirq) {
936 error = drv->pm->poweroff_noirq(dev);
937 suspend_report_result(drv->pm->poweroff_noirq, error);
942 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
943 pci_prepare_to_sleep(pci_dev);
946 * The reason for doing this here is the same as for the analogous code
947 * in pci_pm_suspend_noirq().
949 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
950 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
955 static int pci_pm_restore_noirq(struct device *dev)
957 struct pci_dev *pci_dev = to_pci_dev(dev);
958 struct device_driver *drv = dev->driver;
961 pci_pm_default_resume_early(pci_dev);
963 if (pci_has_legacy_pm_support(pci_dev))
964 return pci_legacy_resume_early(dev);
966 if (drv && drv->pm && drv->pm->restore_noirq)
967 error = drv->pm->restore_noirq(dev);
972 static int pci_pm_restore(struct device *dev)
974 struct pci_dev *pci_dev = to_pci_dev(dev);
975 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
979 * This is necessary for the hibernation error path in which restore is
980 * called without restoring the standard config registers of the device.
982 if (pci_dev->state_saved)
983 pci_restore_standard_config(pci_dev);
985 if (pci_has_legacy_pm_support(pci_dev))
986 return pci_legacy_resume(dev);
988 pci_pm_default_resume(pci_dev);
992 error = pm->restore(dev);
994 pci_pm_reenable_device(pci_dev);
1000 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1002 #define pci_pm_freeze NULL
1003 #define pci_pm_freeze_noirq NULL
1004 #define pci_pm_thaw NULL
1005 #define pci_pm_thaw_noirq NULL
1006 #define pci_pm_poweroff NULL
1007 #define pci_pm_poweroff_noirq NULL
1008 #define pci_pm_restore NULL
1009 #define pci_pm_restore_noirq NULL
1011 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1013 #ifdef CONFIG_PM_RUNTIME
1015 static int pci_pm_runtime_suspend(struct device *dev)
1017 struct pci_dev *pci_dev = to_pci_dev(dev);
1018 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1019 pci_power_t prev = pci_dev->current_state;
1022 if (!pm || !pm->runtime_suspend)
1025 pci_dev->no_d3cold = false;
1026 error = pm->runtime_suspend(dev);
1027 suspend_report_result(pm->runtime_suspend, error);
1030 if (!pci_dev->d3cold_allowed)
1031 pci_dev->no_d3cold = true;
1033 pci_fixup_device(pci_fixup_suspend, pci_dev);
1035 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1036 && pci_dev->current_state != PCI_UNKNOWN) {
1037 WARN_ONCE(pci_dev->current_state != prev,
1038 "PCI PM: State of device not saved by %pF\n",
1039 pm->runtime_suspend);
1043 if (!pci_dev->state_saved)
1044 pci_save_state(pci_dev);
1046 pci_finish_runtime_suspend(pci_dev);
1051 static int pci_pm_runtime_resume(struct device *dev)
1054 struct pci_dev *pci_dev = to_pci_dev(dev);
1055 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1057 if (!pm || !pm->runtime_resume)
1060 pci_restore_standard_config(pci_dev);
1061 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1062 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1063 pci_fixup_device(pci_fixup_resume, pci_dev);
1065 rc = pm->runtime_resume(dev);
1067 pci_dev->runtime_d3cold = false;
1072 static int pci_pm_runtime_idle(struct device *dev)
1074 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1079 if (pm->runtime_idle) {
1080 int ret = pm->runtime_idle(dev);
1085 pm_runtime_suspend(dev);
1090 #else /* !CONFIG_PM_RUNTIME */
1092 #define pci_pm_runtime_suspend NULL
1093 #define pci_pm_runtime_resume NULL
1094 #define pci_pm_runtime_idle NULL
1096 #endif /* !CONFIG_PM_RUNTIME */
1100 const struct dev_pm_ops pci_dev_pm_ops = {
1101 .prepare = pci_pm_prepare,
1102 .complete = pci_pm_complete,
1103 .suspend = pci_pm_suspend,
1104 .resume = pci_pm_resume,
1105 .freeze = pci_pm_freeze,
1106 .thaw = pci_pm_thaw,
1107 .poweroff = pci_pm_poweroff,
1108 .restore = pci_pm_restore,
1109 .suspend_noirq = pci_pm_suspend_noirq,
1110 .resume_noirq = pci_pm_resume_noirq,
1111 .freeze_noirq = pci_pm_freeze_noirq,
1112 .thaw_noirq = pci_pm_thaw_noirq,
1113 .poweroff_noirq = pci_pm_poweroff_noirq,
1114 .restore_noirq = pci_pm_restore_noirq,
1115 .runtime_suspend = pci_pm_runtime_suspend,
1116 .runtime_resume = pci_pm_runtime_resume,
1117 .runtime_idle = pci_pm_runtime_idle,
1120 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1122 #else /* !COMFIG_PM_OPS */
1124 #define PCI_PM_OPS_PTR NULL
1126 #endif /* !COMFIG_PM_OPS */
1129 * __pci_register_driver - register a new pci driver
1130 * @drv: the driver structure to register
1131 * @owner: owner module of drv
1132 * @mod_name: module name string
1134 * Adds the driver structure to the list of registered drivers.
1135 * Returns a negative value on error, otherwise 0.
1136 * If no error occurred, the driver remains registered even if
1137 * no device was claimed during registration.
1139 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1140 const char *mod_name)
1142 /* initialize common driver fields */
1143 drv->driver.name = drv->name;
1144 drv->driver.bus = &pci_bus_type;
1145 drv->driver.owner = owner;
1146 drv->driver.mod_name = mod_name;
1148 spin_lock_init(&drv->dynids.lock);
1149 INIT_LIST_HEAD(&drv->dynids.list);
1151 /* register with core */
1152 return driver_register(&drv->driver);
1156 * pci_unregister_driver - unregister a pci driver
1157 * @drv: the driver structure to unregister
1159 * Deletes the driver structure from the list of registered PCI drivers,
1160 * gives it a chance to clean up by calling its remove() function for
1161 * each device it was responsible for, and marks those devices as
1166 pci_unregister_driver(struct pci_driver *drv)
1168 driver_unregister(&drv->driver);
1169 pci_free_dynids(drv);
1172 static struct pci_driver pci_compat_driver = {
1177 * pci_dev_driver - get the pci_driver of a device
1178 * @dev: the device to query
1180 * Returns the appropriate pci_driver structure or %NULL if there is no
1181 * registered driver for the device.
1184 pci_dev_driver(const struct pci_dev *dev)
1190 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1191 if (dev->resource[i].flags & IORESOURCE_BUSY)
1192 return &pci_compat_driver;
1198 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1199 * @dev: the PCI device structure to match against
1200 * @drv: the device driver to search for matching PCI device id structures
1202 * Used by a driver to check whether a PCI device present in the
1203 * system is in its list of supported devices. Returns the matching
1204 * pci_device_id structure or %NULL if there is no match.
1206 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1208 struct pci_dev *pci_dev = to_pci_dev(dev);
1209 struct pci_driver *pci_drv = to_pci_driver(drv);
1210 const struct pci_device_id *found_id;
1212 found_id = pci_match_device(pci_drv, pci_dev);
1220 * pci_dev_get - increments the reference count of the pci device structure
1221 * @dev: the device being referenced
1223 * Each live reference to a device should be refcounted.
1225 * Drivers for PCI devices should normally record such references in
1226 * their probe() methods, when they bind to a device, and release
1227 * them by calling pci_dev_put(), in their disconnect() methods.
1229 * A pointer to the device with the incremented reference counter is returned.
1231 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1234 get_device(&dev->dev);
1239 * pci_dev_put - release a use of the pci device structure
1240 * @dev: device that's been disconnected
1242 * Must be called when a user of a device is finished with it. When the last
1243 * user of the device calls this function, the memory of the device is freed.
1245 void pci_dev_put(struct pci_dev *dev)
1248 put_device(&dev->dev);
1251 #ifndef CONFIG_HOTPLUG
1252 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1258 struct bus_type pci_bus_type = {
1260 .match = pci_bus_match,
1261 .uevent = pci_uevent,
1262 .probe = pci_device_probe,
1263 .remove = pci_device_remove,
1264 .shutdown = pci_device_shutdown,
1265 .dev_attrs = pci_dev_attrs,
1266 .bus_attrs = pci_bus_attrs,
1267 .drv_attrs = pci_drv_attrs,
1268 .pm = PCI_PM_OPS_PTR,
1271 static int __init pci_driver_init(void)
1273 return bus_register(&pci_bus_type);
1276 postcore_initcall(pci_driver_init);
1278 EXPORT_SYMBOL_GPL(pci_add_dynid);
1279 EXPORT_SYMBOL(pci_match_id);
1280 EXPORT_SYMBOL(__pci_register_driver);
1281 EXPORT_SYMBOL(pci_unregister_driver);
1282 EXPORT_SYMBOL(pci_dev_driver);
1283 EXPORT_SYMBOL(pci_bus_type);
1284 EXPORT_SYMBOL(pci_dev_get);
1285 EXPORT_SYMBOL(pci_dev_put);