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>
24 struct list_head node;
25 struct pci_device_id id;
29 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
30 * @drv: target pci driver
31 * @vendor: PCI vendor ID
32 * @device: PCI device ID
33 * @subvendor: PCI subvendor ID
34 * @subdevice: PCI subdevice ID
36 * @class_mask: PCI class mask
37 * @driver_data: private driver data
39 * Adds a new dynamic pci device ID to this driver and causes the
40 * driver to probe for all devices again. @drv must have been
41 * registered prior to calling this function.
44 * Does GFP_KERNEL allocation.
47 * 0 on success, -errno on failure.
49 int pci_add_dynid(struct pci_driver *drv,
50 unsigned int vendor, unsigned int device,
51 unsigned int subvendor, unsigned int subdevice,
52 unsigned int class, unsigned int class_mask,
53 unsigned long driver_data)
55 struct pci_dynid *dynid;
58 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
62 dynid->id.vendor = vendor;
63 dynid->id.device = device;
64 dynid->id.subvendor = subvendor;
65 dynid->id.subdevice = subdevice;
66 dynid->id.class = class;
67 dynid->id.class_mask = class_mask;
68 dynid->id.driver_data = driver_data;
70 spin_lock(&drv->dynids.lock);
71 list_add_tail(&dynid->node, &drv->dynids.list);
72 spin_unlock(&drv->dynids.lock);
74 get_driver(&drv->driver);
75 retval = driver_attach(&drv->driver);
76 put_driver(&drv->driver);
81 static void pci_free_dynids(struct pci_driver *drv)
83 struct pci_dynid *dynid, *n;
85 spin_lock(&drv->dynids.lock);
86 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
87 list_del(&dynid->node);
90 spin_unlock(&drv->dynids.lock);
94 * Dynamic device ID manipulation via sysfs is disabled for !CONFIG_HOTPLUG
98 * store_new_id - sysfs frontend to pci_add_dynid()
99 * @driver: target device driver
100 * @buf: buffer for scanning device ID data
103 * Allow PCI IDs to be added to an existing driver via sysfs.
106 store_new_id(struct device_driver *driver, const char *buf, size_t count)
108 struct pci_driver *pdrv = to_pci_driver(driver);
109 const struct pci_device_id *ids = pdrv->id_table;
110 __u32 vendor, device, subvendor=PCI_ANY_ID,
111 subdevice=PCI_ANY_ID, class=0, class_mask=0;
112 unsigned long driver_data=0;
116 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
117 &vendor, &device, &subvendor, &subdevice,
118 &class, &class_mask, &driver_data);
122 /* Only accept driver_data values that match an existing id_table
126 while (ids->vendor || ids->subvendor || ids->class_mask) {
127 if (driver_data == ids->driver_data) {
133 if (retval) /* No match */
137 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
138 class, class_mask, driver_data);
143 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
146 * store_remove_id - remove a PCI device ID from this driver
147 * @driver: target device driver
148 * @buf: buffer for scanning device ID data
151 * Removes a dynamic pci device ID to this driver.
154 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
156 struct pci_dynid *dynid, *n;
157 struct pci_driver *pdrv = to_pci_driver(driver);
158 __u32 vendor, device, subvendor = PCI_ANY_ID,
159 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
161 int retval = -ENODEV;
163 fields = sscanf(buf, "%x %x %x %x %x %x",
164 &vendor, &device, &subvendor, &subdevice,
165 &class, &class_mask);
169 spin_lock(&pdrv->dynids.lock);
170 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
171 struct pci_device_id *id = &dynid->id;
172 if ((id->vendor == vendor) &&
173 (id->device == device) &&
174 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
175 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
176 !((id->class ^ class) & class_mask)) {
177 list_del(&dynid->node);
183 spin_unlock(&pdrv->dynids.lock);
189 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
192 pci_create_newid_file(struct pci_driver *drv)
195 if (drv->probe != NULL)
196 error = driver_create_file(&drv->driver, &driver_attr_new_id);
200 static void pci_remove_newid_file(struct pci_driver *drv)
202 driver_remove_file(&drv->driver, &driver_attr_new_id);
206 pci_create_removeid_file(struct pci_driver *drv)
209 if (drv->probe != NULL)
210 error = driver_create_file(&drv->driver,&driver_attr_remove_id);
214 static void pci_remove_removeid_file(struct pci_driver *drv)
216 driver_remove_file(&drv->driver, &driver_attr_remove_id);
218 #else /* !CONFIG_HOTPLUG */
219 static inline int pci_create_newid_file(struct pci_driver *drv)
223 static inline void pci_remove_newid_file(struct pci_driver *drv) {}
224 static inline int pci_create_removeid_file(struct pci_driver *drv)
228 static inline void pci_remove_removeid_file(struct pci_driver *drv) {}
232 * pci_match_id - See if a pci device matches a given pci_id table
233 * @ids: array of PCI device id structures to search in
234 * @dev: the PCI device structure to match against.
236 * Used by a driver to check whether a PCI device present in the
237 * system is in its list of supported devices. Returns the matching
238 * pci_device_id structure or %NULL if there is no match.
240 * Deprecated, don't use this as it will not catch any dynamic ids
241 * that a driver might want to check for.
243 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
247 while (ids->vendor || ids->subvendor || ids->class_mask) {
248 if (pci_match_one_device(ids, dev))
257 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
258 * @drv: the PCI driver to match against
259 * @dev: the PCI device structure to match against
261 * Used by a driver to check whether a PCI device present in the
262 * system is in its list of supported devices. Returns the matching
263 * pci_device_id structure or %NULL if there is no match.
265 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
268 struct pci_dynid *dynid;
270 /* Look at the dynamic ids first, before the static ones */
271 spin_lock(&drv->dynids.lock);
272 list_for_each_entry(dynid, &drv->dynids.list, node) {
273 if (pci_match_one_device(&dynid->id, dev)) {
274 spin_unlock(&drv->dynids.lock);
278 spin_unlock(&drv->dynids.lock);
280 return pci_match_id(drv->id_table, dev);
283 struct drv_dev_and_id {
284 struct pci_driver *drv;
286 const struct pci_device_id *id;
289 static long local_pci_probe(void *_ddi)
291 struct drv_dev_and_id *ddi = _ddi;
292 struct device *dev = &ddi->dev->dev;
295 /* Unbound PCI devices are always set to disabled and suspended.
296 * During probe, the device is set to enabled and active and the
297 * usage count is incremented. If the driver supports runtime PM,
298 * it should call pm_runtime_put_noidle() in its probe routine and
299 * pm_runtime_get_noresume() in its remove routine.
301 pm_runtime_get_noresume(dev);
302 pm_runtime_set_active(dev);
303 pm_runtime_enable(dev);
305 rc = ddi->drv->probe(ddi->dev, ddi->id);
307 pm_runtime_disable(dev);
308 pm_runtime_set_suspended(dev);
309 pm_runtime_put_noidle(dev);
314 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
315 const struct pci_device_id *id)
318 struct drv_dev_and_id ddi = { drv, dev, id };
320 /* Execute driver initialization on node where the device's
321 bus is attached to. This way the driver likely allocates
322 its local memory on the right node without any need to
324 node = dev_to_node(&dev->dev);
329 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
330 if (cpu < nr_cpu_ids)
331 error = work_on_cpu(cpu, local_pci_probe, &ddi);
333 error = local_pci_probe(&ddi);
336 error = local_pci_probe(&ddi);
341 * __pci_device_probe - check if a driver wants to claim a specific PCI device
342 * @drv: driver to call to check if it wants the PCI device
343 * @pci_dev: PCI device being probed
345 * returns 0 on success, else error.
346 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
349 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
351 const struct pci_device_id *id;
354 if (!pci_dev->driver && drv->probe) {
357 id = pci_match_device(drv, pci_dev);
359 error = pci_call_probe(drv, pci_dev, id);
361 pci_dev->driver = drv;
368 static int pci_device_probe(struct device * dev)
371 struct pci_driver *drv;
372 struct pci_dev *pci_dev;
374 drv = to_pci_driver(dev->driver);
375 pci_dev = to_pci_dev(dev);
376 pci_dev_get(pci_dev);
377 error = __pci_device_probe(drv, pci_dev);
379 pci_dev_put(pci_dev);
384 static int pci_device_remove(struct device * dev)
386 struct pci_dev * pci_dev = to_pci_dev(dev);
387 struct pci_driver * drv = pci_dev->driver;
391 pm_runtime_get_sync(dev);
392 drv->remove(pci_dev);
393 pm_runtime_put_noidle(dev);
395 pci_dev->driver = NULL;
398 /* Undo the runtime PM settings in local_pci_probe() */
399 pm_runtime_disable(dev);
400 pm_runtime_set_suspended(dev);
401 pm_runtime_put_noidle(dev);
404 * If the device is still on, set the power state as "unknown",
405 * since it might change by the next time we load the driver.
407 if (pci_dev->current_state == PCI_D0)
408 pci_dev->current_state = PCI_UNKNOWN;
411 * We would love to complain here if pci_dev->is_enabled is set, that
412 * the driver should have called pci_disable_device(), but the
413 * unfortunate fact is there are too many odd BIOS and bridge setups
414 * that don't like drivers doing that all of the time.
415 * Oh well, we can dream of sane hardware when we sleep, no matter how
416 * horrible the crap we have to deal with is when we are awake...
419 pci_dev_put(pci_dev);
423 static void pci_device_shutdown(struct device *dev)
425 struct pci_dev *pci_dev = to_pci_dev(dev);
426 struct pci_driver *drv = pci_dev->driver;
428 if (drv && drv->shutdown)
429 drv->shutdown(pci_dev);
430 pci_msi_shutdown(pci_dev);
431 pci_msix_shutdown(pci_dev);
436 /* Auxiliary functions used for system resume and run-time resume. */
439 * pci_restore_standard_config - restore standard config registers of PCI device
440 * @pci_dev: PCI device to handle
442 static int pci_restore_standard_config(struct pci_dev *pci_dev)
444 pci_update_current_state(pci_dev, PCI_UNKNOWN);
446 if (pci_dev->current_state != PCI_D0) {
447 int error = pci_set_power_state(pci_dev, PCI_D0);
452 pci_restore_state(pci_dev);
456 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
458 pci_restore_standard_config(pci_dev);
459 pci_fixup_device(pci_fixup_resume_early, pci_dev);
464 #ifdef CONFIG_PM_SLEEP
467 * Default "suspend" method for devices that have no driver provided suspend,
468 * or not even a driver at all (second part).
470 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
473 * mark its power state as "unknown", since we don't know if
474 * e.g. the BIOS will change its device state when we suspend.
476 if (pci_dev->current_state == PCI_D0)
477 pci_dev->current_state = PCI_UNKNOWN;
481 * Default "resume" method for devices that have no driver provided resume,
482 * or not even a driver at all (second part).
484 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
488 /* if the device was enabled before suspend, reenable */
489 retval = pci_reenable_device(pci_dev);
491 * if the device was busmaster before the suspend, make it busmaster
494 if (pci_dev->is_busmaster)
495 pci_set_master(pci_dev);
500 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
502 struct pci_dev * pci_dev = to_pci_dev(dev);
503 struct pci_driver * drv = pci_dev->driver;
505 if (drv && drv->suspend) {
506 pci_power_t prev = pci_dev->current_state;
509 error = drv->suspend(pci_dev, state);
510 suspend_report_result(drv->suspend, error);
514 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
515 && pci_dev->current_state != PCI_UNKNOWN) {
516 WARN_ONCE(pci_dev->current_state != prev,
517 "PCI PM: Device state not saved by %pF\n",
522 pci_fixup_device(pci_fixup_suspend, pci_dev);
527 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
529 struct pci_dev * pci_dev = to_pci_dev(dev);
530 struct pci_driver * drv = pci_dev->driver;
532 if (drv && drv->suspend_late) {
533 pci_power_t prev = pci_dev->current_state;
536 error = drv->suspend_late(pci_dev, state);
537 suspend_report_result(drv->suspend_late, error);
541 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
542 && pci_dev->current_state != PCI_UNKNOWN) {
543 WARN_ONCE(pci_dev->current_state != prev,
544 "PCI PM: Device state not saved by %pF\n",
550 if (!pci_dev->state_saved)
551 pci_save_state(pci_dev);
553 pci_pm_set_unknown_state(pci_dev);
558 static int pci_legacy_resume_early(struct device *dev)
560 struct pci_dev * pci_dev = to_pci_dev(dev);
561 struct pci_driver * drv = pci_dev->driver;
563 return drv && drv->resume_early ?
564 drv->resume_early(pci_dev) : 0;
567 static int pci_legacy_resume(struct device *dev)
569 struct pci_dev * pci_dev = to_pci_dev(dev);
570 struct pci_driver * drv = pci_dev->driver;
572 pci_fixup_device(pci_fixup_resume, pci_dev);
574 return drv && drv->resume ?
575 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
578 /* Auxiliary functions used by the new power management framework */
580 static void pci_pm_default_resume(struct pci_dev *pci_dev)
582 pci_fixup_device(pci_fixup_resume, pci_dev);
584 if (!pci_is_bridge(pci_dev))
585 pci_enable_wake(pci_dev, PCI_D0, false);
588 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
590 /* Disable non-bridge devices without PM support */
591 if (!pci_is_bridge(pci_dev))
592 pci_disable_enabled_device(pci_dev);
595 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
597 struct pci_driver *drv = pci_dev->driver;
598 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
599 || drv->resume_early);
602 * Legacy PM support is used by default, so warn if the new framework is
603 * supported as well. Drivers are supposed to support either the
604 * former, or the latter, but not both at the same time.
606 WARN_ON(ret && drv->driver.pm);
611 /* New power management framework */
613 static int pci_pm_prepare(struct device *dev)
615 struct device_driver *drv = dev->driver;
619 * PCI devices suspended at run time need to be resumed at this
620 * point, because in general it is necessary to reconfigure them for
621 * system suspend. Namely, if the device is supposed to wake up the
622 * system from the sleep state, we may need to reconfigure it for this
623 * purpose. In turn, if the device is not supposed to wake up the
624 * system from the sleep state, we'll have to prevent it from signaling
627 pm_runtime_get_sync(dev);
629 if (drv && drv->pm && drv->pm->prepare)
630 error = drv->pm->prepare(dev);
635 static void pci_pm_complete(struct device *dev)
637 struct device_driver *drv = dev->driver;
639 if (drv && drv->pm && drv->pm->complete)
640 drv->pm->complete(dev);
642 pm_runtime_put_sync(dev);
645 #else /* !CONFIG_PM_SLEEP */
647 #define pci_pm_prepare NULL
648 #define pci_pm_complete NULL
650 #endif /* !CONFIG_PM_SLEEP */
652 #ifdef CONFIG_SUSPEND
654 static int pci_pm_suspend(struct device *dev)
656 struct pci_dev *pci_dev = to_pci_dev(dev);
657 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
659 if (pci_has_legacy_pm_support(pci_dev))
660 return pci_legacy_suspend(dev, PMSG_SUSPEND);
663 pci_pm_default_suspend(pci_dev);
668 pci_power_t prev = pci_dev->current_state;
671 error = pm->suspend(dev);
672 suspend_report_result(pm->suspend, error);
676 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
677 && pci_dev->current_state != PCI_UNKNOWN) {
678 WARN_ONCE(pci_dev->current_state != prev,
679 "PCI PM: State of device not saved by %pF\n",
685 pci_fixup_device(pci_fixup_suspend, pci_dev);
690 static int pci_pm_suspend_noirq(struct device *dev)
692 struct pci_dev *pci_dev = to_pci_dev(dev);
693 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
695 if (pci_has_legacy_pm_support(pci_dev))
696 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
699 pci_save_state(pci_dev);
703 if (pm->suspend_noirq) {
704 pci_power_t prev = pci_dev->current_state;
707 error = pm->suspend_noirq(dev);
708 suspend_report_result(pm->suspend_noirq, error);
712 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
713 && pci_dev->current_state != PCI_UNKNOWN) {
714 WARN_ONCE(pci_dev->current_state != prev,
715 "PCI PM: State of device not saved by %pF\n",
721 if (!pci_dev->state_saved) {
722 pci_save_state(pci_dev);
723 if (!pci_is_bridge(pci_dev))
724 pci_prepare_to_sleep(pci_dev);
727 pci_pm_set_unknown_state(pci_dev);
730 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
731 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
732 * hasn't been quiesced and tries to turn it off. If the controller
733 * is already in D3, this can hang or cause memory corruption.
735 * Since the value of the COMMAND register doesn't matter once the
736 * device has been suspended, we can safely set it to 0 here.
738 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
739 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
744 static int pci_pm_resume_noirq(struct device *dev)
746 struct pci_dev *pci_dev = to_pci_dev(dev);
747 struct device_driver *drv = dev->driver;
750 pci_pm_default_resume_early(pci_dev);
752 if (pci_has_legacy_pm_support(pci_dev))
753 return pci_legacy_resume_early(dev);
755 if (drv && drv->pm && drv->pm->resume_noirq)
756 error = drv->pm->resume_noirq(dev);
761 static int pci_pm_resume(struct device *dev)
763 struct pci_dev *pci_dev = to_pci_dev(dev);
764 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
768 * This is necessary for the suspend error path in which resume is
769 * called without restoring the standard config registers of the device.
771 if (pci_dev->state_saved)
772 pci_restore_standard_config(pci_dev);
774 if (pci_has_legacy_pm_support(pci_dev))
775 return pci_legacy_resume(dev);
777 pci_pm_default_resume(pci_dev);
781 error = pm->resume(dev);
783 pci_pm_reenable_device(pci_dev);
789 #else /* !CONFIG_SUSPEND */
791 #define pci_pm_suspend NULL
792 #define pci_pm_suspend_noirq NULL
793 #define pci_pm_resume NULL
794 #define pci_pm_resume_noirq NULL
796 #endif /* !CONFIG_SUSPEND */
798 #ifdef CONFIG_HIBERNATE_CALLBACKS
800 static int pci_pm_freeze(struct device *dev)
802 struct pci_dev *pci_dev = to_pci_dev(dev);
803 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
805 if (pci_has_legacy_pm_support(pci_dev))
806 return pci_legacy_suspend(dev, PMSG_FREEZE);
809 pci_pm_default_suspend(pci_dev);
816 error = pm->freeze(dev);
817 suspend_report_result(pm->freeze, error);
825 static int pci_pm_freeze_noirq(struct device *dev)
827 struct pci_dev *pci_dev = to_pci_dev(dev);
828 struct device_driver *drv = dev->driver;
830 if (pci_has_legacy_pm_support(pci_dev))
831 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
833 if (drv && drv->pm && drv->pm->freeze_noirq) {
836 error = drv->pm->freeze_noirq(dev);
837 suspend_report_result(drv->pm->freeze_noirq, error);
842 if (!pci_dev->state_saved)
843 pci_save_state(pci_dev);
845 pci_pm_set_unknown_state(pci_dev);
850 static int pci_pm_thaw_noirq(struct device *dev)
852 struct pci_dev *pci_dev = to_pci_dev(dev);
853 struct device_driver *drv = dev->driver;
856 if (pci_has_legacy_pm_support(pci_dev))
857 return pci_legacy_resume_early(dev);
859 pci_update_current_state(pci_dev, PCI_D0);
861 if (drv && drv->pm && drv->pm->thaw_noirq)
862 error = drv->pm->thaw_noirq(dev);
867 static int pci_pm_thaw(struct device *dev)
869 struct pci_dev *pci_dev = to_pci_dev(dev);
870 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
873 if (pci_has_legacy_pm_support(pci_dev))
874 return pci_legacy_resume(dev);
878 error = pm->thaw(dev);
880 pci_pm_reenable_device(pci_dev);
883 pci_dev->state_saved = false;
888 static int pci_pm_poweroff(struct device *dev)
890 struct pci_dev *pci_dev = to_pci_dev(dev);
891 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
893 if (pci_has_legacy_pm_support(pci_dev))
894 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
897 pci_pm_default_suspend(pci_dev);
904 error = pm->poweroff(dev);
905 suspend_report_result(pm->poweroff, error);
911 pci_fixup_device(pci_fixup_suspend, pci_dev);
916 static int pci_pm_poweroff_noirq(struct device *dev)
918 struct pci_dev *pci_dev = to_pci_dev(dev);
919 struct device_driver *drv = dev->driver;
921 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
922 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
924 if (!drv || !drv->pm)
927 if (drv->pm->poweroff_noirq) {
930 error = drv->pm->poweroff_noirq(dev);
931 suspend_report_result(drv->pm->poweroff_noirq, error);
936 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
937 pci_prepare_to_sleep(pci_dev);
940 * The reason for doing this here is the same as for the analogous code
941 * in pci_pm_suspend_noirq().
943 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
944 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
949 static int pci_pm_restore_noirq(struct device *dev)
951 struct pci_dev *pci_dev = to_pci_dev(dev);
952 struct device_driver *drv = dev->driver;
955 pci_pm_default_resume_early(pci_dev);
957 if (pci_has_legacy_pm_support(pci_dev))
958 return pci_legacy_resume_early(dev);
960 if (drv && drv->pm && drv->pm->restore_noirq)
961 error = drv->pm->restore_noirq(dev);
966 static int pci_pm_restore(struct device *dev)
968 struct pci_dev *pci_dev = to_pci_dev(dev);
969 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
973 * This is necessary for the hibernation error path in which restore is
974 * called without restoring the standard config registers of the device.
976 if (pci_dev->state_saved)
977 pci_restore_standard_config(pci_dev);
979 if (pci_has_legacy_pm_support(pci_dev))
980 return pci_legacy_resume(dev);
982 pci_pm_default_resume(pci_dev);
986 error = pm->restore(dev);
988 pci_pm_reenable_device(pci_dev);
994 #else /* !CONFIG_HIBERNATE_CALLBACKS */
996 #define pci_pm_freeze NULL
997 #define pci_pm_freeze_noirq NULL
998 #define pci_pm_thaw NULL
999 #define pci_pm_thaw_noirq NULL
1000 #define pci_pm_poweroff NULL
1001 #define pci_pm_poweroff_noirq NULL
1002 #define pci_pm_restore NULL
1003 #define pci_pm_restore_noirq NULL
1005 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1007 #ifdef CONFIG_PM_RUNTIME
1009 static int pci_pm_runtime_suspend(struct device *dev)
1011 struct pci_dev *pci_dev = to_pci_dev(dev);
1012 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1013 pci_power_t prev = pci_dev->current_state;
1016 if (!pm || !pm->runtime_suspend)
1019 error = pm->runtime_suspend(dev);
1020 suspend_report_result(pm->runtime_suspend, error);
1024 pci_fixup_device(pci_fixup_suspend, pci_dev);
1026 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1027 && pci_dev->current_state != PCI_UNKNOWN) {
1028 WARN_ONCE(pci_dev->current_state != prev,
1029 "PCI PM: State of device not saved by %pF\n",
1030 pm->runtime_suspend);
1034 if (!pci_dev->state_saved)
1035 pci_save_state(pci_dev);
1037 pci_finish_runtime_suspend(pci_dev);
1042 static int pci_pm_runtime_resume(struct device *dev)
1044 struct pci_dev *pci_dev = to_pci_dev(dev);
1045 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1047 if (!pm || !pm->runtime_resume)
1050 pci_pm_default_resume_early(pci_dev);
1051 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1052 pci_fixup_device(pci_fixup_resume, pci_dev);
1054 return pm->runtime_resume(dev);
1057 static int pci_pm_runtime_idle(struct device *dev)
1059 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1064 if (pm->runtime_idle) {
1065 int ret = pm->runtime_idle(dev);
1070 pm_runtime_suspend(dev);
1075 #else /* !CONFIG_PM_RUNTIME */
1077 #define pci_pm_runtime_suspend NULL
1078 #define pci_pm_runtime_resume NULL
1079 #define pci_pm_runtime_idle NULL
1081 #endif /* !CONFIG_PM_RUNTIME */
1085 const struct dev_pm_ops pci_dev_pm_ops = {
1086 .prepare = pci_pm_prepare,
1087 .complete = pci_pm_complete,
1088 .suspend = pci_pm_suspend,
1089 .resume = pci_pm_resume,
1090 .freeze = pci_pm_freeze,
1091 .thaw = pci_pm_thaw,
1092 .poweroff = pci_pm_poweroff,
1093 .restore = pci_pm_restore,
1094 .suspend_noirq = pci_pm_suspend_noirq,
1095 .resume_noirq = pci_pm_resume_noirq,
1096 .freeze_noirq = pci_pm_freeze_noirq,
1097 .thaw_noirq = pci_pm_thaw_noirq,
1098 .poweroff_noirq = pci_pm_poweroff_noirq,
1099 .restore_noirq = pci_pm_restore_noirq,
1100 .runtime_suspend = pci_pm_runtime_suspend,
1101 .runtime_resume = pci_pm_runtime_resume,
1102 .runtime_idle = pci_pm_runtime_idle,
1105 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1107 #else /* !COMFIG_PM_OPS */
1109 #define PCI_PM_OPS_PTR NULL
1111 #endif /* !COMFIG_PM_OPS */
1114 * __pci_register_driver - register a new pci driver
1115 * @drv: the driver structure to register
1116 * @owner: owner module of drv
1117 * @mod_name: module name string
1119 * Adds the driver structure to the list of registered drivers.
1120 * Returns a negative value on error, otherwise 0.
1121 * If no error occurred, the driver remains registered even if
1122 * no device was claimed during registration.
1124 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1125 const char *mod_name)
1129 /* initialize common driver fields */
1130 drv->driver.name = drv->name;
1131 drv->driver.bus = &pci_bus_type;
1132 drv->driver.owner = owner;
1133 drv->driver.mod_name = mod_name;
1135 spin_lock_init(&drv->dynids.lock);
1136 INIT_LIST_HEAD(&drv->dynids.list);
1138 /* register with core */
1139 error = driver_register(&drv->driver);
1143 error = pci_create_newid_file(drv);
1147 error = pci_create_removeid_file(drv);
1154 pci_remove_newid_file(drv);
1156 driver_unregister(&drv->driver);
1161 * pci_unregister_driver - unregister a pci driver
1162 * @drv: the driver structure to unregister
1164 * Deletes the driver structure from the list of registered PCI drivers,
1165 * gives it a chance to clean up by calling its remove() function for
1166 * each device it was responsible for, and marks those devices as
1171 pci_unregister_driver(struct pci_driver *drv)
1173 pci_remove_removeid_file(drv);
1174 pci_remove_newid_file(drv);
1175 driver_unregister(&drv->driver);
1176 pci_free_dynids(drv);
1179 static struct pci_driver pci_compat_driver = {
1184 * pci_dev_driver - get the pci_driver of a device
1185 * @dev: the device to query
1187 * Returns the appropriate pci_driver structure or %NULL if there is no
1188 * registered driver for the device.
1191 pci_dev_driver(const struct pci_dev *dev)
1197 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1198 if (dev->resource[i].flags & IORESOURCE_BUSY)
1199 return &pci_compat_driver;
1205 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1206 * @dev: the PCI device structure to match against
1207 * @drv: the device driver to search for matching PCI device id structures
1209 * Used by a driver to check whether a PCI device present in the
1210 * system is in its list of supported devices. Returns the matching
1211 * pci_device_id structure or %NULL if there is no match.
1213 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1215 struct pci_dev *pci_dev = to_pci_dev(dev);
1216 struct pci_driver *pci_drv = to_pci_driver(drv);
1217 const struct pci_device_id *found_id;
1219 found_id = pci_match_device(pci_drv, pci_dev);
1227 * pci_dev_get - increments the reference count of the pci device structure
1228 * @dev: the device being referenced
1230 * Each live reference to a device should be refcounted.
1232 * Drivers for PCI devices should normally record such references in
1233 * their probe() methods, when they bind to a device, and release
1234 * them by calling pci_dev_put(), in their disconnect() methods.
1236 * A pointer to the device with the incremented reference counter is returned.
1238 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1241 get_device(&dev->dev);
1246 * pci_dev_put - release a use of the pci device structure
1247 * @dev: device that's been disconnected
1249 * Must be called when a user of a device is finished with it. When the last
1250 * user of the device calls this function, the memory of the device is freed.
1252 void pci_dev_put(struct pci_dev *dev)
1255 put_device(&dev->dev);
1258 #ifndef CONFIG_HOTPLUG
1259 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1265 struct bus_type pci_bus_type = {
1267 .match = pci_bus_match,
1268 .uevent = pci_uevent,
1269 .probe = pci_device_probe,
1270 .remove = pci_device_remove,
1271 .shutdown = pci_device_shutdown,
1272 .dev_attrs = pci_dev_attrs,
1273 .bus_attrs = pci_bus_attrs,
1274 .pm = PCI_PM_OPS_PTR,
1277 static int __init pci_driver_init(void)
1279 return bus_register(&pci_bus_type);
1282 postcore_initcall(pci_driver_init);
1284 EXPORT_SYMBOL_GPL(pci_add_dynid);
1285 EXPORT_SYMBOL(pci_match_id);
1286 EXPORT_SYMBOL(__pci_register_driver);
1287 EXPORT_SYMBOL(pci_unregister_driver);
1288 EXPORT_SYMBOL(pci_dev_driver);
1289 EXPORT_SYMBOL(pci_bus_type);
1290 EXPORT_SYMBOL(pci_dev_get);
1291 EXPORT_SYMBOL(pci_dev_put);