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);
142 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
145 * store_remove_id - remove a PCI device ID from this driver
146 * @driver: target device driver
147 * @buf: buffer for scanning device ID data
150 * Removes a dynamic pci device ID to this driver.
153 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
155 struct pci_dynid *dynid, *n;
156 struct pci_driver *pdrv = to_pci_driver(driver);
157 __u32 vendor, device, subvendor = PCI_ANY_ID,
158 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
160 int retval = -ENODEV;
162 fields = sscanf(buf, "%x %x %x %x %x %x",
163 &vendor, &device, &subvendor, &subdevice,
164 &class, &class_mask);
168 spin_lock(&pdrv->dynids.lock);
169 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
170 struct pci_device_id *id = &dynid->id;
171 if ((id->vendor == vendor) &&
172 (id->device == device) &&
173 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
174 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
175 !((id->class ^ class) & class_mask)) {
176 list_del(&dynid->node);
182 spin_unlock(&pdrv->dynids.lock);
188 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
191 pci_create_newid_files(struct pci_driver *drv)
195 if (drv->probe != NULL) {
196 error = driver_create_file(&drv->driver, &driver_attr_new_id);
198 error = driver_create_file(&drv->driver,
199 &driver_attr_remove_id);
201 driver_remove_file(&drv->driver,
202 &driver_attr_new_id);
208 static void pci_remove_newid_files(struct pci_driver *drv)
210 driver_remove_file(&drv->driver, &driver_attr_remove_id);
211 driver_remove_file(&drv->driver, &driver_attr_new_id);
213 #else /* !CONFIG_HOTPLUG */
214 static inline int pci_create_newid_files(struct pci_driver *drv)
218 static inline void pci_remove_newid_files(struct pci_driver *drv) {}
222 * pci_match_id - See if a pci device matches a given pci_id table
223 * @ids: array of PCI device id structures to search in
224 * @dev: the PCI device structure to match against.
226 * Used by a driver to check whether a PCI device present in the
227 * system is in its list of supported devices. Returns the matching
228 * pci_device_id structure or %NULL if there is no match.
230 * Deprecated, don't use this as it will not catch any dynamic ids
231 * that a driver might want to check for.
233 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
237 while (ids->vendor || ids->subvendor || ids->class_mask) {
238 if (pci_match_one_device(ids, dev))
247 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
248 * @drv: the PCI driver to match against
249 * @dev: the PCI device structure to match against
251 * Used by a driver to check whether a PCI device present in the
252 * system is in its list of supported devices. Returns the matching
253 * pci_device_id structure or %NULL if there is no match.
255 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
258 struct pci_dynid *dynid;
260 /* Look at the dynamic ids first, before the static ones */
261 spin_lock(&drv->dynids.lock);
262 list_for_each_entry(dynid, &drv->dynids.list, node) {
263 if (pci_match_one_device(&dynid->id, dev)) {
264 spin_unlock(&drv->dynids.lock);
268 spin_unlock(&drv->dynids.lock);
270 return pci_match_id(drv->id_table, dev);
273 struct drv_dev_and_id {
274 struct pci_driver *drv;
276 const struct pci_device_id *id;
279 static long local_pci_probe(void *_ddi)
281 struct drv_dev_and_id *ddi = _ddi;
282 struct device *dev = &ddi->dev->dev;
285 /* Unbound PCI devices are always set to disabled and suspended.
286 * During probe, the device is set to enabled and active and the
287 * usage count is incremented. If the driver supports runtime PM,
288 * it should call pm_runtime_put_noidle() in its probe routine and
289 * pm_runtime_get_noresume() in its remove routine.
291 pm_runtime_get_noresume(dev);
292 pm_runtime_set_active(dev);
293 pm_runtime_enable(dev);
295 rc = ddi->drv->probe(ddi->dev, ddi->id);
297 pm_runtime_disable(dev);
298 pm_runtime_set_suspended(dev);
299 pm_runtime_put_noidle(dev);
304 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
305 const struct pci_device_id *id)
308 struct drv_dev_and_id ddi = { drv, dev, id };
310 /* Execute driver initialization on node where the device's
311 bus is attached to. This way the driver likely allocates
312 its local memory on the right node without any need to
314 node = dev_to_node(&dev->dev);
319 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
320 if (cpu < nr_cpu_ids)
321 error = work_on_cpu(cpu, local_pci_probe, &ddi);
323 error = local_pci_probe(&ddi);
326 error = local_pci_probe(&ddi);
331 * __pci_device_probe - check if a driver wants to claim a specific PCI device
332 * @drv: driver to call to check if it wants the PCI device
333 * @pci_dev: PCI device being probed
335 * returns 0 on success, else error.
336 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
339 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
341 const struct pci_device_id *id;
344 if (!pci_dev->driver && drv->probe) {
347 id = pci_match_device(drv, pci_dev);
349 error = pci_call_probe(drv, pci_dev, id);
351 pci_dev->driver = drv;
358 static int pci_device_probe(struct device * dev)
361 struct pci_driver *drv;
362 struct pci_dev *pci_dev;
364 drv = to_pci_driver(dev->driver);
365 pci_dev = to_pci_dev(dev);
366 pci_dev_get(pci_dev);
367 error = __pci_device_probe(drv, pci_dev);
369 pci_dev_put(pci_dev);
374 static int pci_device_remove(struct device * dev)
376 struct pci_dev * pci_dev = to_pci_dev(dev);
377 struct pci_driver * drv = pci_dev->driver;
381 pm_runtime_get_sync(dev);
382 drv->remove(pci_dev);
383 pm_runtime_put_noidle(dev);
385 pci_dev->driver = NULL;
388 /* Undo the runtime PM settings in local_pci_probe() */
389 pm_runtime_disable(dev);
390 pm_runtime_set_suspended(dev);
391 pm_runtime_put_noidle(dev);
394 * If the device is still on, set the power state as "unknown",
395 * since it might change by the next time we load the driver.
397 if (pci_dev->current_state == PCI_D0)
398 pci_dev->current_state = PCI_UNKNOWN;
401 * We would love to complain here if pci_dev->is_enabled is set, that
402 * the driver should have called pci_disable_device(), but the
403 * unfortunate fact is there are too many odd BIOS and bridge setups
404 * that don't like drivers doing that all of the time.
405 * Oh well, we can dream of sane hardware when we sleep, no matter how
406 * horrible the crap we have to deal with is when we are awake...
409 pci_dev_put(pci_dev);
413 static void pci_device_shutdown(struct device *dev)
415 struct pci_dev *pci_dev = to_pci_dev(dev);
416 struct pci_driver *drv = pci_dev->driver;
418 if (drv && drv->shutdown)
419 drv->shutdown(pci_dev);
420 pci_msi_shutdown(pci_dev);
421 pci_msix_shutdown(pci_dev);
426 /* Auxiliary functions used for system resume and run-time resume. */
429 * pci_restore_standard_config - restore standard config registers of PCI device
430 * @pci_dev: PCI device to handle
432 static int pci_restore_standard_config(struct pci_dev *pci_dev)
434 pci_update_current_state(pci_dev, PCI_UNKNOWN);
436 if (pci_dev->current_state != PCI_D0) {
437 int error = pci_set_power_state(pci_dev, PCI_D0);
442 pci_restore_state(pci_dev);
446 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
448 pci_restore_standard_config(pci_dev);
449 pci_fixup_device(pci_fixup_resume_early, pci_dev);
454 #ifdef CONFIG_PM_SLEEP
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);
738 static int pci_pm_resume_noirq(struct device *dev)
740 struct pci_dev *pci_dev = to_pci_dev(dev);
741 struct device_driver *drv = dev->driver;
744 pci_pm_default_resume_early(pci_dev);
746 if (pci_has_legacy_pm_support(pci_dev))
747 return pci_legacy_resume_early(dev);
749 if (drv && drv->pm && drv->pm->resume_noirq)
750 error = drv->pm->resume_noirq(dev);
755 static int pci_pm_resume(struct device *dev)
757 struct pci_dev *pci_dev = to_pci_dev(dev);
758 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
762 * This is necessary for the suspend error path in which resume is
763 * called without restoring the standard config registers of the device.
765 if (pci_dev->state_saved)
766 pci_restore_standard_config(pci_dev);
768 if (pci_has_legacy_pm_support(pci_dev))
769 return pci_legacy_resume(dev);
771 pci_pm_default_resume(pci_dev);
775 error = pm->resume(dev);
777 pci_pm_reenable_device(pci_dev);
783 #else /* !CONFIG_SUSPEND */
785 #define pci_pm_suspend NULL
786 #define pci_pm_suspend_noirq NULL
787 #define pci_pm_resume NULL
788 #define pci_pm_resume_noirq NULL
790 #endif /* !CONFIG_SUSPEND */
792 #ifdef CONFIG_HIBERNATE_CALLBACKS
794 static int pci_pm_freeze(struct device *dev)
796 struct pci_dev *pci_dev = to_pci_dev(dev);
797 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
799 if (pci_has_legacy_pm_support(pci_dev))
800 return pci_legacy_suspend(dev, PMSG_FREEZE);
803 pci_pm_default_suspend(pci_dev);
810 error = pm->freeze(dev);
811 suspend_report_result(pm->freeze, error);
819 static int pci_pm_freeze_noirq(struct device *dev)
821 struct pci_dev *pci_dev = to_pci_dev(dev);
822 struct device_driver *drv = dev->driver;
824 if (pci_has_legacy_pm_support(pci_dev))
825 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
827 if (drv && drv->pm && drv->pm->freeze_noirq) {
830 error = drv->pm->freeze_noirq(dev);
831 suspend_report_result(drv->pm->freeze_noirq, error);
836 if (!pci_dev->state_saved)
837 pci_save_state(pci_dev);
839 pci_pm_set_unknown_state(pci_dev);
844 static int pci_pm_thaw_noirq(struct device *dev)
846 struct pci_dev *pci_dev = to_pci_dev(dev);
847 struct device_driver *drv = dev->driver;
850 if (pci_has_legacy_pm_support(pci_dev))
851 return pci_legacy_resume_early(dev);
853 pci_update_current_state(pci_dev, PCI_D0);
855 if (drv && drv->pm && drv->pm->thaw_noirq)
856 error = drv->pm->thaw_noirq(dev);
861 static int pci_pm_thaw(struct device *dev)
863 struct pci_dev *pci_dev = to_pci_dev(dev);
864 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
867 if (pci_has_legacy_pm_support(pci_dev))
868 return pci_legacy_resume(dev);
872 error = pm->thaw(dev);
874 pci_pm_reenable_device(pci_dev);
877 pci_dev->state_saved = false;
882 static int pci_pm_poweroff(struct device *dev)
884 struct pci_dev *pci_dev = to_pci_dev(dev);
885 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
887 if (pci_has_legacy_pm_support(pci_dev))
888 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
891 pci_pm_default_suspend(pci_dev);
898 error = pm->poweroff(dev);
899 suspend_report_result(pm->poweroff, error);
905 pci_fixup_device(pci_fixup_suspend, pci_dev);
910 static int pci_pm_poweroff_noirq(struct device *dev)
912 struct pci_dev *pci_dev = to_pci_dev(dev);
913 struct device_driver *drv = dev->driver;
915 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
916 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
918 if (!drv || !drv->pm)
921 if (drv->pm->poweroff_noirq) {
924 error = drv->pm->poweroff_noirq(dev);
925 suspend_report_result(drv->pm->poweroff_noirq, error);
930 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
931 pci_prepare_to_sleep(pci_dev);
936 static int pci_pm_restore_noirq(struct device *dev)
938 struct pci_dev *pci_dev = to_pci_dev(dev);
939 struct device_driver *drv = dev->driver;
942 pci_pm_default_resume_early(pci_dev);
944 if (pci_has_legacy_pm_support(pci_dev))
945 return pci_legacy_resume_early(dev);
947 if (drv && drv->pm && drv->pm->restore_noirq)
948 error = drv->pm->restore_noirq(dev);
953 static int pci_pm_restore(struct device *dev)
955 struct pci_dev *pci_dev = to_pci_dev(dev);
956 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
960 * This is necessary for the hibernation error path in which restore is
961 * called without restoring the standard config registers of the device.
963 if (pci_dev->state_saved)
964 pci_restore_standard_config(pci_dev);
966 if (pci_has_legacy_pm_support(pci_dev))
967 return pci_legacy_resume(dev);
969 pci_pm_default_resume(pci_dev);
973 error = pm->restore(dev);
975 pci_pm_reenable_device(pci_dev);
981 #else /* !CONFIG_HIBERNATE_CALLBACKS */
983 #define pci_pm_freeze NULL
984 #define pci_pm_freeze_noirq NULL
985 #define pci_pm_thaw NULL
986 #define pci_pm_thaw_noirq NULL
987 #define pci_pm_poweroff NULL
988 #define pci_pm_poweroff_noirq NULL
989 #define pci_pm_restore NULL
990 #define pci_pm_restore_noirq NULL
992 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
994 #ifdef CONFIG_PM_RUNTIME
996 static int pci_pm_runtime_suspend(struct device *dev)
998 struct pci_dev *pci_dev = to_pci_dev(dev);
999 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1000 pci_power_t prev = pci_dev->current_state;
1003 if (!pm || !pm->runtime_suspend)
1006 error = pm->runtime_suspend(dev);
1007 suspend_report_result(pm->runtime_suspend, error);
1011 pci_fixup_device(pci_fixup_suspend, pci_dev);
1013 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1014 && pci_dev->current_state != PCI_UNKNOWN) {
1015 WARN_ONCE(pci_dev->current_state != prev,
1016 "PCI PM: State of device not saved by %pF\n",
1017 pm->runtime_suspend);
1021 if (!pci_dev->state_saved)
1022 pci_save_state(pci_dev);
1024 pci_finish_runtime_suspend(pci_dev);
1029 static int pci_pm_runtime_resume(struct device *dev)
1031 struct pci_dev *pci_dev = to_pci_dev(dev);
1032 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1034 if (!pm || !pm->runtime_resume)
1037 pci_pm_default_resume_early(pci_dev);
1038 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1039 pci_fixup_device(pci_fixup_resume, pci_dev);
1041 return pm->runtime_resume(dev);
1044 static int pci_pm_runtime_idle(struct device *dev)
1046 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1051 if (pm->runtime_idle) {
1052 int ret = pm->runtime_idle(dev);
1057 pm_runtime_suspend(dev);
1062 #else /* !CONFIG_PM_RUNTIME */
1064 #define pci_pm_runtime_suspend NULL
1065 #define pci_pm_runtime_resume NULL
1066 #define pci_pm_runtime_idle NULL
1068 #endif /* !CONFIG_PM_RUNTIME */
1072 const struct dev_pm_ops pci_dev_pm_ops = {
1073 .prepare = pci_pm_prepare,
1074 .complete = pci_pm_complete,
1075 .suspend = pci_pm_suspend,
1076 .resume = pci_pm_resume,
1077 .freeze = pci_pm_freeze,
1078 .thaw = pci_pm_thaw,
1079 .poweroff = pci_pm_poweroff,
1080 .restore = pci_pm_restore,
1081 .suspend_noirq = pci_pm_suspend_noirq,
1082 .resume_noirq = pci_pm_resume_noirq,
1083 .freeze_noirq = pci_pm_freeze_noirq,
1084 .thaw_noirq = pci_pm_thaw_noirq,
1085 .poweroff_noirq = pci_pm_poweroff_noirq,
1086 .restore_noirq = pci_pm_restore_noirq,
1087 .runtime_suspend = pci_pm_runtime_suspend,
1088 .runtime_resume = pci_pm_runtime_resume,
1089 .runtime_idle = pci_pm_runtime_idle,
1092 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1094 #else /* !COMFIG_PM_OPS */
1096 #define PCI_PM_OPS_PTR NULL
1098 #endif /* !COMFIG_PM_OPS */
1101 * __pci_register_driver - register a new pci driver
1102 * @drv: the driver structure to register
1103 * @owner: owner module of drv
1104 * @mod_name: module name string
1106 * Adds the driver structure to the list of registered drivers.
1107 * Returns a negative value on error, otherwise 0.
1108 * If no error occurred, the driver remains registered even if
1109 * no device was claimed during registration.
1111 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1112 const char *mod_name)
1116 /* initialize common driver fields */
1117 drv->driver.name = drv->name;
1118 drv->driver.bus = &pci_bus_type;
1119 drv->driver.owner = owner;
1120 drv->driver.mod_name = mod_name;
1122 spin_lock_init(&drv->dynids.lock);
1123 INIT_LIST_HEAD(&drv->dynids.list);
1125 /* register with core */
1126 error = driver_register(&drv->driver);
1130 error = pci_create_newid_files(drv);
1137 driver_unregister(&drv->driver);
1142 * pci_unregister_driver - unregister a pci driver
1143 * @drv: the driver structure to unregister
1145 * Deletes the driver structure from the list of registered PCI drivers,
1146 * gives it a chance to clean up by calling its remove() function for
1147 * each device it was responsible for, and marks those devices as
1152 pci_unregister_driver(struct pci_driver *drv)
1154 pci_remove_newid_files(drv);
1155 driver_unregister(&drv->driver);
1156 pci_free_dynids(drv);
1159 static struct pci_driver pci_compat_driver = {
1164 * pci_dev_driver - get the pci_driver of a device
1165 * @dev: the device to query
1167 * Returns the appropriate pci_driver structure or %NULL if there is no
1168 * registered driver for the device.
1171 pci_dev_driver(const struct pci_dev *dev)
1177 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1178 if (dev->resource[i].flags & IORESOURCE_BUSY)
1179 return &pci_compat_driver;
1185 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1186 * @dev: the PCI device structure to match against
1187 * @drv: the device driver to search for matching PCI device id structures
1189 * Used by a driver to check whether a PCI device present in the
1190 * system is in its list of supported devices. Returns the matching
1191 * pci_device_id structure or %NULL if there is no match.
1193 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1195 struct pci_dev *pci_dev = to_pci_dev(dev);
1196 struct pci_driver *pci_drv = to_pci_driver(drv);
1197 const struct pci_device_id *found_id;
1199 found_id = pci_match_device(pci_drv, pci_dev);
1207 * pci_dev_get - increments the reference count of the pci device structure
1208 * @dev: the device being referenced
1210 * Each live reference to a device should be refcounted.
1212 * Drivers for PCI devices should normally record such references in
1213 * their probe() methods, when they bind to a device, and release
1214 * them by calling pci_dev_put(), in their disconnect() methods.
1216 * A pointer to the device with the incremented reference counter is returned.
1218 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1221 get_device(&dev->dev);
1226 * pci_dev_put - release a use of the pci device structure
1227 * @dev: device that's been disconnected
1229 * Must be called when a user of a device is finished with it. When the last
1230 * user of the device calls this function, the memory of the device is freed.
1232 void pci_dev_put(struct pci_dev *dev)
1235 put_device(&dev->dev);
1238 #ifndef CONFIG_HOTPLUG
1239 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1245 struct bus_type pci_bus_type = {
1247 .match = pci_bus_match,
1248 .uevent = pci_uevent,
1249 .probe = pci_device_probe,
1250 .remove = pci_device_remove,
1251 .shutdown = pci_device_shutdown,
1252 .dev_attrs = pci_dev_attrs,
1253 .bus_attrs = pci_bus_attrs,
1254 .pm = PCI_PM_OPS_PTR,
1257 static int __init pci_driver_init(void)
1259 return bus_register(&pci_bus_type);
1262 postcore_initcall(pci_driver_init);
1264 EXPORT_SYMBOL_GPL(pci_add_dynid);
1265 EXPORT_SYMBOL(pci_match_id);
1266 EXPORT_SYMBOL(__pci_register_driver);
1267 EXPORT_SYMBOL(pci_unregister_driver);
1268 EXPORT_SYMBOL(pci_dev_driver);
1269 EXPORT_SYMBOL(pci_bus_type);
1270 EXPORT_SYMBOL(pci_dev_get);
1271 EXPORT_SYMBOL(pci_dev_put);