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 get_driver(&drv->driver);
76 retval = driver_attach(&drv->driver);
77 put_driver(&drv->driver);
82 static void pci_free_dynids(struct pci_driver *drv)
84 struct pci_dynid *dynid, *n;
86 spin_lock(&drv->dynids.lock);
87 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
88 list_del(&dynid->node);
91 spin_unlock(&drv->dynids.lock);
95 * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG
99 * store_new_id - sysfs frontend to pci_add_dynid()
100 * @driver: target device driver
101 * @buf: buffer for scanning device ID data
104 * Allow PCI IDs to be added to an existing driver via sysfs.
107 store_new_id(struct device_driver *driver, const char *buf, size_t count)
109 struct pci_driver *pdrv = to_pci_driver(driver);
110 const struct pci_device_id *ids = pdrv->id_table;
111 __u32 vendor, device, subvendor=PCI_ANY_ID,
112 subdevice=PCI_ANY_ID, class=0, class_mask=0;
113 unsigned long driver_data=0;
117 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
118 &vendor, &device, &subvendor, &subdevice,
119 &class, &class_mask, &driver_data);
123 /* Only accept driver_data values that match an existing id_table
127 while (ids->vendor || ids->subvendor || ids->class_mask) {
128 if (driver_data == ids->driver_data) {
134 if (retval) /* No match */
138 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
139 class, class_mask, driver_data);
144 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
147 * store_remove_id - remove a PCI device ID from this driver
148 * @driver: target device driver
149 * @buf: buffer for scanning device ID data
152 * Removes a dynamic pci device ID to this driver.
155 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
157 struct pci_dynid *dynid, *n;
158 struct pci_driver *pdrv = to_pci_driver(driver);
159 __u32 vendor, device, subvendor = PCI_ANY_ID,
160 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
162 int retval = -ENODEV;
164 fields = sscanf(buf, "%x %x %x %x %x %x",
165 &vendor, &device, &subvendor, &subdevice,
166 &class, &class_mask);
170 spin_lock(&pdrv->dynids.lock);
171 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
172 struct pci_device_id *id = &dynid->id;
173 if ((id->vendor == vendor) &&
174 (id->device == device) &&
175 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
176 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
177 !((id->class ^ class) & class_mask)) {
178 list_del(&dynid->node);
184 spin_unlock(&pdrv->dynids.lock);
190 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
193 pci_create_newid_file(struct pci_driver *drv)
196 if (drv->probe != NULL)
197 error = driver_create_file(&drv->driver, &driver_attr_new_id);
201 static void pci_remove_newid_file(struct pci_driver *drv)
203 driver_remove_file(&drv->driver, &driver_attr_new_id);
207 pci_create_removeid_file(struct pci_driver *drv)
210 if (drv->probe != NULL)
211 error = driver_create_file(&drv->driver,&driver_attr_remove_id);
215 static void pci_remove_removeid_file(struct pci_driver *drv)
217 driver_remove_file(&drv->driver, &driver_attr_remove_id);
219 #else /* !CONFIG_HOTPLUG */
220 static inline int pci_create_newid_file(struct pci_driver *drv)
224 static inline void pci_remove_newid_file(struct pci_driver *drv) {}
225 static inline int pci_create_removeid_file(struct pci_driver *drv)
229 static inline void pci_remove_removeid_file(struct pci_driver *drv) {}
233 * pci_match_id - See if a pci device matches a given pci_id table
234 * @ids: array of PCI device id structures to search in
235 * @dev: the PCI device structure to match against.
237 * Used by a driver to check whether a PCI device present in the
238 * system is in its list of supported devices. Returns the matching
239 * pci_device_id structure or %NULL if there is no match.
241 * Deprecated, don't use this as it will not catch any dynamic ids
242 * that a driver might want to check for.
244 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
248 while (ids->vendor || ids->subvendor || ids->class_mask) {
249 if (pci_match_one_device(ids, dev))
258 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
259 * @drv: the PCI driver to match against
260 * @dev: the PCI device structure to match against
262 * Used by a driver to check whether a PCI device present in the
263 * system is in its list of supported devices. Returns the matching
264 * pci_device_id structure or %NULL if there is no match.
266 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
269 struct pci_dynid *dynid;
271 /* Look at the dynamic ids first, before the static ones */
272 spin_lock(&drv->dynids.lock);
273 list_for_each_entry(dynid, &drv->dynids.list, node) {
274 if (pci_match_one_device(&dynid->id, dev)) {
275 spin_unlock(&drv->dynids.lock);
279 spin_unlock(&drv->dynids.lock);
281 return pci_match_id(drv->id_table, dev);
284 struct drv_dev_and_id {
285 struct pci_driver *drv;
287 const struct pci_device_id *id;
290 static long local_pci_probe(void *_ddi)
292 struct drv_dev_and_id *ddi = _ddi;
293 struct device *dev = &ddi->dev->dev;
296 /* Unbound PCI devices are always set to disabled and suspended.
297 * During probe, the device is set to enabled and active and the
298 * usage count is incremented. If the driver supports runtime PM,
299 * it should call pm_runtime_put_noidle() in its probe routine and
300 * pm_runtime_get_noresume() in its remove routine.
302 pm_runtime_get_noresume(dev);
303 pm_runtime_set_active(dev);
304 pm_runtime_enable(dev);
306 rc = ddi->drv->probe(ddi->dev, ddi->id);
308 pm_runtime_disable(dev);
309 pm_runtime_set_suspended(dev);
310 pm_runtime_put_noidle(dev);
315 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
316 const struct pci_device_id *id)
319 struct drv_dev_and_id ddi = { drv, dev, id };
321 /* Execute driver initialization on node where the device's
322 bus is attached to. This way the driver likely allocates
323 its local memory on the right node without any need to
325 node = dev_to_node(&dev->dev);
330 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
331 if (cpu < nr_cpu_ids)
332 error = work_on_cpu(cpu, local_pci_probe, &ddi);
334 error = local_pci_probe(&ddi);
337 error = local_pci_probe(&ddi);
342 * __pci_device_probe - check if a driver wants to claim a specific PCI device
343 * @drv: driver to call to check if it wants the PCI device
344 * @pci_dev: PCI device being probed
346 * returns 0 on success, else error.
347 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
350 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
352 const struct pci_device_id *id;
355 if (!pci_dev->driver && drv->probe) {
358 id = pci_match_device(drv, pci_dev);
360 error = pci_call_probe(drv, pci_dev, id);
362 pci_dev->driver = drv;
369 static int pci_device_probe(struct device * dev)
372 struct pci_driver *drv;
373 struct pci_dev *pci_dev;
375 drv = to_pci_driver(dev->driver);
376 pci_dev = to_pci_dev(dev);
377 pci_dev_get(pci_dev);
378 error = __pci_device_probe(drv, pci_dev);
380 pci_dev_put(pci_dev);
385 static int pci_device_remove(struct device * dev)
387 struct pci_dev * pci_dev = to_pci_dev(dev);
388 struct pci_driver * drv = pci_dev->driver;
392 pm_runtime_get_sync(dev);
393 drv->remove(pci_dev);
394 pm_runtime_put_noidle(dev);
396 pci_dev->driver = NULL;
399 /* Undo the runtime PM settings in local_pci_probe() */
400 pm_runtime_disable(dev);
401 pm_runtime_set_suspended(dev);
402 pm_runtime_put_noidle(dev);
405 * If the device is still on, set the power state as "unknown",
406 * since it might change by the next time we load the driver.
408 if (pci_dev->current_state == PCI_D0)
409 pci_dev->current_state = PCI_UNKNOWN;
412 * We would love to complain here if pci_dev->is_enabled is set, that
413 * the driver should have called pci_disable_device(), but the
414 * unfortunate fact is there are too many odd BIOS and bridge setups
415 * that don't like drivers doing that all of the time.
416 * Oh well, we can dream of sane hardware when we sleep, no matter how
417 * horrible the crap we have to deal with is when we are awake...
420 pci_dev_put(pci_dev);
424 static void pci_device_shutdown(struct device *dev)
426 struct pci_dev *pci_dev = to_pci_dev(dev);
427 struct pci_driver *drv = pci_dev->driver;
429 if (drv && drv->shutdown)
430 drv->shutdown(pci_dev);
431 pci_msi_shutdown(pci_dev);
432 pci_msix_shutdown(pci_dev);
437 /* Auxiliary functions used for system resume and run-time resume. */
440 * pci_restore_standard_config - restore standard config registers of PCI device
441 * @pci_dev: PCI device to handle
443 static int pci_restore_standard_config(struct pci_dev *pci_dev)
445 pci_update_current_state(pci_dev, PCI_UNKNOWN);
447 if (pci_dev->current_state != PCI_D0) {
448 int error = pci_set_power_state(pci_dev, PCI_D0);
453 pci_restore_state(pci_dev);
457 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
459 pci_restore_standard_config(pci_dev);
460 pci_fixup_device(pci_fixup_resume_early, pci_dev);
465 #ifdef CONFIG_PM_SLEEP
468 * Default "suspend" method for devices that have no driver provided suspend,
469 * or not even a driver at all (second part).
471 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
474 * mark its power state as "unknown", since we don't know if
475 * e.g. the BIOS will change its device state when we suspend.
477 if (pci_dev->current_state == PCI_D0)
478 pci_dev->current_state = PCI_UNKNOWN;
482 * Default "resume" method for devices that have no driver provided resume,
483 * or not even a driver at all (second part).
485 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
489 /* if the device was enabled before suspend, reenable */
490 retval = pci_reenable_device(pci_dev);
492 * if the device was busmaster before the suspend, make it busmaster
495 if (pci_dev->is_busmaster)
496 pci_set_master(pci_dev);
501 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
503 struct pci_dev * pci_dev = to_pci_dev(dev);
504 struct pci_driver * drv = pci_dev->driver;
506 if (drv && drv->suspend) {
507 pci_power_t prev = pci_dev->current_state;
510 error = drv->suspend(pci_dev, state);
511 suspend_report_result(drv->suspend, error);
515 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
516 && pci_dev->current_state != PCI_UNKNOWN) {
517 WARN_ONCE(pci_dev->current_state != prev,
518 "PCI PM: Device state not saved by %pF\n",
523 pci_fixup_device(pci_fixup_suspend, pci_dev);
528 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
530 struct pci_dev * pci_dev = to_pci_dev(dev);
531 struct pci_driver * drv = pci_dev->driver;
533 if (drv && drv->suspend_late) {
534 pci_power_t prev = pci_dev->current_state;
537 error = drv->suspend_late(pci_dev, state);
538 suspend_report_result(drv->suspend_late, error);
542 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
543 && pci_dev->current_state != PCI_UNKNOWN) {
544 WARN_ONCE(pci_dev->current_state != prev,
545 "PCI PM: Device state not saved by %pF\n",
551 if (!pci_dev->state_saved)
552 pci_save_state(pci_dev);
554 pci_pm_set_unknown_state(pci_dev);
559 static int pci_legacy_resume_early(struct device *dev)
561 struct pci_dev * pci_dev = to_pci_dev(dev);
562 struct pci_driver * drv = pci_dev->driver;
564 return drv && drv->resume_early ?
565 drv->resume_early(pci_dev) : 0;
568 static int pci_legacy_resume(struct device *dev)
570 struct pci_dev * pci_dev = to_pci_dev(dev);
571 struct pci_driver * drv = pci_dev->driver;
573 pci_fixup_device(pci_fixup_resume, pci_dev);
575 return drv && drv->resume ?
576 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
579 /* Auxiliary functions used by the new power management framework */
581 static void pci_pm_default_resume(struct pci_dev *pci_dev)
583 pci_fixup_device(pci_fixup_resume, pci_dev);
585 if (!pci_is_bridge(pci_dev))
586 pci_enable_wake(pci_dev, PCI_D0, false);
589 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
591 /* Disable non-bridge devices without PM support */
592 if (!pci_is_bridge(pci_dev))
593 pci_disable_enabled_device(pci_dev);
596 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
598 struct pci_driver *drv = pci_dev->driver;
599 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
600 || drv->resume_early);
603 * Legacy PM support is used by default, so warn if the new framework is
604 * supported as well. Drivers are supposed to support either the
605 * former, or the latter, but not both at the same time.
607 WARN_ON(ret && drv->driver.pm);
612 /* New power management framework */
614 static int pci_pm_prepare(struct device *dev)
616 struct device_driver *drv = dev->driver;
620 * If a PCI device configured to wake up the system from sleep states
621 * has been suspended at run time and there's a resume request pending
622 * for it, this is equivalent to the device signaling wakeup, so the
623 * system suspend operation should be aborted.
625 pm_runtime_get_noresume(dev);
626 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
627 pm_wakeup_event(dev, 0);
629 if (pm_wakeup_pending()) {
630 pm_runtime_put_sync(dev);
635 * PCI devices suspended at run time need to be resumed at this
636 * point, because in general it is necessary to reconfigure them for
637 * system suspend. Namely, if the device is supposed to wake up the
638 * system from the sleep state, we may need to reconfigure it for this
639 * purpose. In turn, if the device is not supposed to wake up the
640 * system from the sleep state, we'll have to prevent it from signaling
643 pm_runtime_resume(dev);
645 if (drv && drv->pm && drv->pm->prepare)
646 error = drv->pm->prepare(dev);
651 static void pci_pm_complete(struct device *dev)
653 struct device_driver *drv = dev->driver;
655 if (drv && drv->pm && drv->pm->complete)
656 drv->pm->complete(dev);
658 pm_runtime_put_sync(dev);
661 #else /* !CONFIG_PM_SLEEP */
663 #define pci_pm_prepare NULL
664 #define pci_pm_complete NULL
666 #endif /* !CONFIG_PM_SLEEP */
668 #ifdef CONFIG_SUSPEND
670 static int pci_pm_suspend(struct device *dev)
672 struct pci_dev *pci_dev = to_pci_dev(dev);
673 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
675 if (pci_has_legacy_pm_support(pci_dev))
676 return pci_legacy_suspend(dev, PMSG_SUSPEND);
679 pci_pm_default_suspend(pci_dev);
684 pci_power_t prev = pci_dev->current_state;
687 error = pm->suspend(dev);
688 suspend_report_result(pm->suspend, error);
692 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
693 && pci_dev->current_state != PCI_UNKNOWN) {
694 WARN_ONCE(pci_dev->current_state != prev,
695 "PCI PM: State of device not saved by %pF\n",
701 pci_fixup_device(pci_fixup_suspend, pci_dev);
706 static int pci_pm_suspend_noirq(struct device *dev)
708 struct pci_dev *pci_dev = to_pci_dev(dev);
709 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
711 if (pci_has_legacy_pm_support(pci_dev))
712 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
715 pci_save_state(pci_dev);
719 if (pm->suspend_noirq) {
720 pci_power_t prev = pci_dev->current_state;
723 error = pm->suspend_noirq(dev);
724 suspend_report_result(pm->suspend_noirq, error);
728 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
729 && pci_dev->current_state != PCI_UNKNOWN) {
730 WARN_ONCE(pci_dev->current_state != prev,
731 "PCI PM: State of device not saved by %pF\n",
737 if (!pci_dev->state_saved) {
738 pci_save_state(pci_dev);
739 if (!pci_is_bridge(pci_dev))
740 pci_prepare_to_sleep(pci_dev);
743 pci_pm_set_unknown_state(pci_dev);
746 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
747 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
748 * hasn't been quiesced and tries to turn it off. If the controller
749 * is already in D3, this can hang or cause memory corruption.
751 * Since the value of the COMMAND register doesn't matter once the
752 * device has been suspended, we can safely set it to 0 here.
754 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
755 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
760 static int pci_pm_resume_noirq(struct device *dev)
762 struct pci_dev *pci_dev = to_pci_dev(dev);
763 struct device_driver *drv = dev->driver;
766 pci_pm_default_resume_early(pci_dev);
768 if (pci_has_legacy_pm_support(pci_dev))
769 return pci_legacy_resume_early(dev);
771 if (drv && drv->pm && drv->pm->resume_noirq)
772 error = drv->pm->resume_noirq(dev);
777 static int pci_pm_resume(struct device *dev)
779 struct pci_dev *pci_dev = to_pci_dev(dev);
780 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
784 * This is necessary for the suspend error path in which resume is
785 * called without restoring the standard config registers of the device.
787 if (pci_dev->state_saved)
788 pci_restore_standard_config(pci_dev);
790 if (pci_has_legacy_pm_support(pci_dev))
791 return pci_legacy_resume(dev);
793 pci_pm_default_resume(pci_dev);
797 error = pm->resume(dev);
799 pci_pm_reenable_device(pci_dev);
805 #else /* !CONFIG_SUSPEND */
807 #define pci_pm_suspend NULL
808 #define pci_pm_suspend_noirq NULL
809 #define pci_pm_resume NULL
810 #define pci_pm_resume_noirq NULL
812 #endif /* !CONFIG_SUSPEND */
814 #ifdef CONFIG_HIBERNATE_CALLBACKS
816 static int pci_pm_freeze(struct device *dev)
818 struct pci_dev *pci_dev = to_pci_dev(dev);
819 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
821 if (pci_has_legacy_pm_support(pci_dev))
822 return pci_legacy_suspend(dev, PMSG_FREEZE);
825 pci_pm_default_suspend(pci_dev);
832 error = pm->freeze(dev);
833 suspend_report_result(pm->freeze, error);
841 static int pci_pm_freeze_noirq(struct device *dev)
843 struct pci_dev *pci_dev = to_pci_dev(dev);
844 struct device_driver *drv = dev->driver;
846 if (pci_has_legacy_pm_support(pci_dev))
847 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
849 if (drv && drv->pm && drv->pm->freeze_noirq) {
852 error = drv->pm->freeze_noirq(dev);
853 suspend_report_result(drv->pm->freeze_noirq, error);
858 if (!pci_dev->state_saved)
859 pci_save_state(pci_dev);
861 pci_pm_set_unknown_state(pci_dev);
866 static int pci_pm_thaw_noirq(struct device *dev)
868 struct pci_dev *pci_dev = to_pci_dev(dev);
869 struct device_driver *drv = dev->driver;
872 if (pci_has_legacy_pm_support(pci_dev))
873 return pci_legacy_resume_early(dev);
875 pci_update_current_state(pci_dev, PCI_D0);
876 pci_restore_state(pci_dev);
878 if (drv && drv->pm && drv->pm->thaw_noirq)
879 error = drv->pm->thaw_noirq(dev);
884 static int pci_pm_thaw(struct device *dev)
886 struct pci_dev *pci_dev = to_pci_dev(dev);
887 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
890 if (pci_has_legacy_pm_support(pci_dev))
891 return pci_legacy_resume(dev);
895 error = pm->thaw(dev);
897 pci_pm_reenable_device(pci_dev);
900 pci_dev->state_saved = false;
905 static int pci_pm_poweroff(struct device *dev)
907 struct pci_dev *pci_dev = to_pci_dev(dev);
908 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
910 if (pci_has_legacy_pm_support(pci_dev))
911 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
914 pci_pm_default_suspend(pci_dev);
921 error = pm->poweroff(dev);
922 suspend_report_result(pm->poweroff, error);
928 pci_fixup_device(pci_fixup_suspend, pci_dev);
933 static int pci_pm_poweroff_noirq(struct device *dev)
935 struct pci_dev *pci_dev = to_pci_dev(dev);
936 struct device_driver *drv = dev->driver;
938 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
939 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
941 if (!drv || !drv->pm)
944 if (drv->pm->poweroff_noirq) {
947 error = drv->pm->poweroff_noirq(dev);
948 suspend_report_result(drv->pm->poweroff_noirq, error);
953 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
954 pci_prepare_to_sleep(pci_dev);
957 * The reason for doing this here is the same as for the analogous code
958 * in pci_pm_suspend_noirq().
960 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
961 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
966 static int pci_pm_restore_noirq(struct device *dev)
968 struct pci_dev *pci_dev = to_pci_dev(dev);
969 struct device_driver *drv = dev->driver;
972 pci_pm_default_resume_early(pci_dev);
974 if (pci_has_legacy_pm_support(pci_dev))
975 return pci_legacy_resume_early(dev);
977 if (drv && drv->pm && drv->pm->restore_noirq)
978 error = drv->pm->restore_noirq(dev);
983 static int pci_pm_restore(struct device *dev)
985 struct pci_dev *pci_dev = to_pci_dev(dev);
986 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
990 * This is necessary for the hibernation error path in which restore is
991 * called without restoring the standard config registers of the device.
993 if (pci_dev->state_saved)
994 pci_restore_standard_config(pci_dev);
996 if (pci_has_legacy_pm_support(pci_dev))
997 return pci_legacy_resume(dev);
999 pci_pm_default_resume(pci_dev);
1003 error = pm->restore(dev);
1005 pci_pm_reenable_device(pci_dev);
1011 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1013 #define pci_pm_freeze NULL
1014 #define pci_pm_freeze_noirq NULL
1015 #define pci_pm_thaw NULL
1016 #define pci_pm_thaw_noirq NULL
1017 #define pci_pm_poweroff NULL
1018 #define pci_pm_poweroff_noirq NULL
1019 #define pci_pm_restore NULL
1020 #define pci_pm_restore_noirq NULL
1022 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1024 #ifdef CONFIG_PM_RUNTIME
1026 static int pci_pm_runtime_suspend(struct device *dev)
1028 struct pci_dev *pci_dev = to_pci_dev(dev);
1029 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1030 pci_power_t prev = pci_dev->current_state;
1033 if (!pm || !pm->runtime_suspend)
1036 error = pm->runtime_suspend(dev);
1037 suspend_report_result(pm->runtime_suspend, error);
1041 pci_fixup_device(pci_fixup_suspend, pci_dev);
1043 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1044 && pci_dev->current_state != PCI_UNKNOWN) {
1045 WARN_ONCE(pci_dev->current_state != prev,
1046 "PCI PM: State of device not saved by %pF\n",
1047 pm->runtime_suspend);
1051 if (!pci_dev->state_saved)
1052 pci_save_state(pci_dev);
1054 pci_finish_runtime_suspend(pci_dev);
1059 static int pci_pm_runtime_resume(struct device *dev)
1061 struct pci_dev *pci_dev = to_pci_dev(dev);
1062 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1064 if (!pm || !pm->runtime_resume)
1067 pci_pm_default_resume_early(pci_dev);
1068 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1069 pci_fixup_device(pci_fixup_resume, pci_dev);
1071 return pm->runtime_resume(dev);
1074 static int pci_pm_runtime_idle(struct device *dev)
1076 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1081 if (pm->runtime_idle) {
1082 int ret = pm->runtime_idle(dev);
1087 pm_runtime_suspend(dev);
1092 #else /* !CONFIG_PM_RUNTIME */
1094 #define pci_pm_runtime_suspend NULL
1095 #define pci_pm_runtime_resume NULL
1096 #define pci_pm_runtime_idle NULL
1098 #endif /* !CONFIG_PM_RUNTIME */
1102 const struct dev_pm_ops pci_dev_pm_ops = {
1103 .prepare = pci_pm_prepare,
1104 .complete = pci_pm_complete,
1105 .suspend = pci_pm_suspend,
1106 .resume = pci_pm_resume,
1107 .freeze = pci_pm_freeze,
1108 .thaw = pci_pm_thaw,
1109 .poweroff = pci_pm_poweroff,
1110 .restore = pci_pm_restore,
1111 .suspend_noirq = pci_pm_suspend_noirq,
1112 .resume_noirq = pci_pm_resume_noirq,
1113 .freeze_noirq = pci_pm_freeze_noirq,
1114 .thaw_noirq = pci_pm_thaw_noirq,
1115 .poweroff_noirq = pci_pm_poweroff_noirq,
1116 .restore_noirq = pci_pm_restore_noirq,
1117 .runtime_suspend = pci_pm_runtime_suspend,
1118 .runtime_resume = pci_pm_runtime_resume,
1119 .runtime_idle = pci_pm_runtime_idle,
1122 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1124 #else /* !COMFIG_PM_OPS */
1126 #define PCI_PM_OPS_PTR NULL
1128 #endif /* !COMFIG_PM_OPS */
1131 * __pci_register_driver - register a new pci driver
1132 * @drv: the driver structure to register
1133 * @owner: owner module of drv
1134 * @mod_name: module name string
1136 * Adds the driver structure to the list of registered drivers.
1137 * Returns a negative value on error, otherwise 0.
1138 * If no error occurred, the driver remains registered even if
1139 * no device was claimed during registration.
1141 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1142 const char *mod_name)
1146 /* initialize common driver fields */
1147 drv->driver.name = drv->name;
1148 drv->driver.bus = &pci_bus_type;
1149 drv->driver.owner = owner;
1150 drv->driver.mod_name = mod_name;
1152 spin_lock_init(&drv->dynids.lock);
1153 INIT_LIST_HEAD(&drv->dynids.list);
1155 /* register with core */
1156 error = driver_register(&drv->driver);
1160 error = pci_create_newid_file(drv);
1164 error = pci_create_removeid_file(drv);
1171 pci_remove_newid_file(drv);
1173 driver_unregister(&drv->driver);
1178 * pci_unregister_driver - unregister a pci driver
1179 * @drv: the driver structure to unregister
1181 * Deletes the driver structure from the list of registered PCI drivers,
1182 * gives it a chance to clean up by calling its remove() function for
1183 * each device it was responsible for, and marks those devices as
1188 pci_unregister_driver(struct pci_driver *drv)
1190 pci_remove_removeid_file(drv);
1191 pci_remove_newid_file(drv);
1192 driver_unregister(&drv->driver);
1193 pci_free_dynids(drv);
1196 static struct pci_driver pci_compat_driver = {
1201 * pci_dev_driver - get the pci_driver of a device
1202 * @dev: the device to query
1204 * Returns the appropriate pci_driver structure or %NULL if there is no
1205 * registered driver for the device.
1208 pci_dev_driver(const struct pci_dev *dev)
1214 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1215 if (dev->resource[i].flags & IORESOURCE_BUSY)
1216 return &pci_compat_driver;
1222 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1223 * @dev: the PCI device structure to match against
1224 * @drv: the device driver to search for matching PCI device id structures
1226 * Used by a driver to check whether a PCI device present in the
1227 * system is in its list of supported devices. Returns the matching
1228 * pci_device_id structure or %NULL if there is no match.
1230 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1232 struct pci_dev *pci_dev = to_pci_dev(dev);
1233 struct pci_driver *pci_drv = to_pci_driver(drv);
1234 const struct pci_device_id *found_id;
1236 found_id = pci_match_device(pci_drv, pci_dev);
1244 * pci_dev_get - increments the reference count of the pci device structure
1245 * @dev: the device being referenced
1247 * Each live reference to a device should be refcounted.
1249 * Drivers for PCI devices should normally record such references in
1250 * their probe() methods, when they bind to a device, and release
1251 * them by calling pci_dev_put(), in their disconnect() methods.
1253 * A pointer to the device with the incremented reference counter is returned.
1255 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1258 get_device(&dev->dev);
1263 * pci_dev_put - release a use of the pci device structure
1264 * @dev: device that's been disconnected
1266 * Must be called when a user of a device is finished with it. When the last
1267 * user of the device calls this function, the memory of the device is freed.
1269 void pci_dev_put(struct pci_dev *dev)
1272 put_device(&dev->dev);
1275 #ifndef CONFIG_HOTPLUG
1276 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1282 struct bus_type pci_bus_type = {
1284 .match = pci_bus_match,
1285 .uevent = pci_uevent,
1286 .probe = pci_device_probe,
1287 .remove = pci_device_remove,
1288 .shutdown = pci_device_shutdown,
1289 .dev_attrs = pci_dev_attrs,
1290 .bus_attrs = pci_bus_attrs,
1291 .pm = PCI_PM_OPS_PTR,
1294 static int __init pci_driver_init(void)
1296 return bus_register(&pci_bus_type);
1299 postcore_initcall(pci_driver_init);
1301 EXPORT_SYMBOL_GPL(pci_add_dynid);
1302 EXPORT_SYMBOL(pci_match_id);
1303 EXPORT_SYMBOL(__pci_register_driver);
1304 EXPORT_SYMBOL(pci_unregister_driver);
1305 EXPORT_SYMBOL(pci_dev_driver);
1306 EXPORT_SYMBOL(pci_bus_type);
1307 EXPORT_SYMBOL(pci_dev_get);
1308 EXPORT_SYMBOL(pci_dev_put);