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);
424 * Turn off Bus Master bit on the device to tell it to not
427 pci_disable_device(pci_dev);
430 * Devices may be enabled to wake up by runtime PM, but they need not
431 * be supposed to wake up the system from its "power off" state (e.g.
432 * ACPI S5). Therefore disable wakeup for all devices that aren't
433 * supposed to wake up the system at this point. The state argument
434 * will be ignored by pci_enable_wake().
436 if (!device_may_wakeup(dev))
437 pci_enable_wake(pci_dev, PCI_UNKNOWN, false);
442 /* Auxiliary functions used for system resume and run-time resume. */
445 * pci_restore_standard_config - restore standard config registers of PCI device
446 * @pci_dev: PCI device to handle
448 static int pci_restore_standard_config(struct pci_dev *pci_dev)
450 pci_update_current_state(pci_dev, PCI_UNKNOWN);
452 if (pci_dev->current_state != PCI_D0) {
453 int error = pci_set_power_state(pci_dev, PCI_D0);
458 pci_restore_state(pci_dev);
462 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
464 pci_restore_standard_config(pci_dev);
465 pci_fixup_device(pci_fixup_resume_early, pci_dev);
470 #ifdef CONFIG_PM_SLEEP
473 * Default "suspend" method for devices that have no driver provided suspend,
474 * or not even a driver at all (second part).
476 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
479 * mark its power state as "unknown", since we don't know if
480 * e.g. the BIOS will change its device state when we suspend.
482 if (pci_dev->current_state == PCI_D0)
483 pci_dev->current_state = PCI_UNKNOWN;
487 * Default "resume" method for devices that have no driver provided resume,
488 * or not even a driver at all (second part).
490 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
494 /* if the device was enabled before suspend, reenable */
495 retval = pci_reenable_device(pci_dev);
497 * if the device was busmaster before the suspend, make it busmaster
500 if (pci_dev->is_busmaster)
501 pci_set_master(pci_dev);
506 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
508 struct pci_dev * pci_dev = to_pci_dev(dev);
509 struct pci_driver * drv = pci_dev->driver;
511 if (drv && drv->suspend) {
512 pci_power_t prev = pci_dev->current_state;
515 error = drv->suspend(pci_dev, state);
516 suspend_report_result(drv->suspend, error);
520 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
521 && pci_dev->current_state != PCI_UNKNOWN) {
522 WARN_ONCE(pci_dev->current_state != prev,
523 "PCI PM: Device state not saved by %pF\n",
528 pci_fixup_device(pci_fixup_suspend, pci_dev);
533 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
535 struct pci_dev * pci_dev = to_pci_dev(dev);
536 struct pci_driver * drv = pci_dev->driver;
538 if (drv && drv->suspend_late) {
539 pci_power_t prev = pci_dev->current_state;
542 error = drv->suspend_late(pci_dev, state);
543 suspend_report_result(drv->suspend_late, error);
547 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
548 && pci_dev->current_state != PCI_UNKNOWN) {
549 WARN_ONCE(pci_dev->current_state != prev,
550 "PCI PM: Device state not saved by %pF\n",
556 if (!pci_dev->state_saved)
557 pci_save_state(pci_dev);
559 pci_pm_set_unknown_state(pci_dev);
564 static int pci_legacy_resume_early(struct device *dev)
566 struct pci_dev * pci_dev = to_pci_dev(dev);
567 struct pci_driver * drv = pci_dev->driver;
569 return drv && drv->resume_early ?
570 drv->resume_early(pci_dev) : 0;
573 static int pci_legacy_resume(struct device *dev)
575 struct pci_dev * pci_dev = to_pci_dev(dev);
576 struct pci_driver * drv = pci_dev->driver;
578 pci_fixup_device(pci_fixup_resume, pci_dev);
580 return drv && drv->resume ?
581 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
584 /* Auxiliary functions used by the new power management framework */
586 static void pci_pm_default_resume(struct pci_dev *pci_dev)
588 pci_fixup_device(pci_fixup_resume, pci_dev);
590 if (!pci_is_bridge(pci_dev))
591 pci_enable_wake(pci_dev, PCI_D0, false);
594 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
596 /* Disable non-bridge devices without PM support */
597 if (!pci_is_bridge(pci_dev))
598 pci_disable_enabled_device(pci_dev);
601 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
603 struct pci_driver *drv = pci_dev->driver;
604 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
605 || drv->resume_early);
608 * Legacy PM support is used by default, so warn if the new framework is
609 * supported as well. Drivers are supposed to support either the
610 * former, or the latter, but not both at the same time.
612 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
613 drv->name, pci_dev->vendor, pci_dev->device);
618 /* New power management framework */
620 static int pci_pm_prepare(struct device *dev)
622 struct device_driver *drv = dev->driver;
626 * If a PCI device configured to wake up the system from sleep states
627 * has been suspended at run time and there's a resume request pending
628 * for it, this is equivalent to the device signaling wakeup, so the
629 * system suspend operation should be aborted.
631 pm_runtime_get_noresume(dev);
632 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
633 pm_wakeup_event(dev, 0);
635 if (pm_wakeup_pending()) {
636 pm_runtime_put_sync(dev);
641 * PCI devices suspended at run time need to be resumed at this
642 * point, because in general it is necessary to reconfigure them for
643 * system suspend. Namely, if the device is supposed to wake up the
644 * system from the sleep state, we may need to reconfigure it for this
645 * purpose. In turn, if the device is not supposed to wake up the
646 * system from the sleep state, we'll have to prevent it from signaling
649 pm_runtime_resume(dev);
651 if (drv && drv->pm && drv->pm->prepare)
652 error = drv->pm->prepare(dev);
657 static void pci_pm_complete(struct device *dev)
659 struct device_driver *drv = dev->driver;
661 if (drv && drv->pm && drv->pm->complete)
662 drv->pm->complete(dev);
664 pm_runtime_put_sync(dev);
667 #else /* !CONFIG_PM_SLEEP */
669 #define pci_pm_prepare NULL
670 #define pci_pm_complete NULL
672 #endif /* !CONFIG_PM_SLEEP */
674 #ifdef CONFIG_SUSPEND
676 static int pci_pm_suspend(struct device *dev)
678 struct pci_dev *pci_dev = to_pci_dev(dev);
679 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
681 if (pci_has_legacy_pm_support(pci_dev))
682 return pci_legacy_suspend(dev, PMSG_SUSPEND);
685 pci_pm_default_suspend(pci_dev);
690 pci_power_t prev = pci_dev->current_state;
693 error = pm->suspend(dev);
694 suspend_report_result(pm->suspend, error);
698 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
699 && pci_dev->current_state != PCI_UNKNOWN) {
700 WARN_ONCE(pci_dev->current_state != prev,
701 "PCI PM: State of device not saved by %pF\n",
707 pci_fixup_device(pci_fixup_suspend, pci_dev);
712 static int pci_pm_suspend_noirq(struct device *dev)
714 struct pci_dev *pci_dev = to_pci_dev(dev);
715 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
717 if (pci_has_legacy_pm_support(pci_dev))
718 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
721 pci_save_state(pci_dev);
725 if (pm->suspend_noirq) {
726 pci_power_t prev = pci_dev->current_state;
729 error = pm->suspend_noirq(dev);
730 suspend_report_result(pm->suspend_noirq, error);
734 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
735 && pci_dev->current_state != PCI_UNKNOWN) {
736 WARN_ONCE(pci_dev->current_state != prev,
737 "PCI PM: State of device not saved by %pF\n",
743 if (!pci_dev->state_saved) {
744 pci_save_state(pci_dev);
745 if (!pci_is_bridge(pci_dev))
746 pci_prepare_to_sleep(pci_dev);
749 pci_pm_set_unknown_state(pci_dev);
754 static int pci_pm_resume_noirq(struct device *dev)
756 struct pci_dev *pci_dev = to_pci_dev(dev);
757 struct device_driver *drv = dev->driver;
760 pci_pm_default_resume_early(pci_dev);
762 if (pci_has_legacy_pm_support(pci_dev))
763 return pci_legacy_resume_early(dev);
765 if (drv && drv->pm && drv->pm->resume_noirq)
766 error = drv->pm->resume_noirq(dev);
771 static int pci_pm_resume(struct device *dev)
773 struct pci_dev *pci_dev = to_pci_dev(dev);
774 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
778 * This is necessary for the suspend error path in which resume is
779 * called without restoring the standard config registers of the device.
781 if (pci_dev->state_saved)
782 pci_restore_standard_config(pci_dev);
784 if (pci_has_legacy_pm_support(pci_dev))
785 return pci_legacy_resume(dev);
787 pci_pm_default_resume(pci_dev);
791 error = pm->resume(dev);
793 pci_pm_reenable_device(pci_dev);
799 #else /* !CONFIG_SUSPEND */
801 #define pci_pm_suspend NULL
802 #define pci_pm_suspend_noirq NULL
803 #define pci_pm_resume NULL
804 #define pci_pm_resume_noirq NULL
806 #endif /* !CONFIG_SUSPEND */
808 #ifdef CONFIG_HIBERNATE_CALLBACKS
810 static int pci_pm_freeze(struct device *dev)
812 struct pci_dev *pci_dev = to_pci_dev(dev);
813 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
815 if (pci_has_legacy_pm_support(pci_dev))
816 return pci_legacy_suspend(dev, PMSG_FREEZE);
819 pci_pm_default_suspend(pci_dev);
826 error = pm->freeze(dev);
827 suspend_report_result(pm->freeze, error);
835 static int pci_pm_freeze_noirq(struct device *dev)
837 struct pci_dev *pci_dev = to_pci_dev(dev);
838 struct device_driver *drv = dev->driver;
840 if (pci_has_legacy_pm_support(pci_dev))
841 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
843 if (drv && drv->pm && drv->pm->freeze_noirq) {
846 error = drv->pm->freeze_noirq(dev);
847 suspend_report_result(drv->pm->freeze_noirq, error);
852 if (!pci_dev->state_saved)
853 pci_save_state(pci_dev);
855 pci_pm_set_unknown_state(pci_dev);
860 static int pci_pm_thaw_noirq(struct device *dev)
862 struct pci_dev *pci_dev = to_pci_dev(dev);
863 struct device_driver *drv = dev->driver;
866 if (pci_has_legacy_pm_support(pci_dev))
867 return pci_legacy_resume_early(dev);
869 pci_update_current_state(pci_dev, PCI_D0);
871 if (drv && drv->pm && drv->pm->thaw_noirq)
872 error = drv->pm->thaw_noirq(dev);
877 static int pci_pm_thaw(struct device *dev)
879 struct pci_dev *pci_dev = to_pci_dev(dev);
880 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
883 if (pci_has_legacy_pm_support(pci_dev))
884 return pci_legacy_resume(dev);
888 error = pm->thaw(dev);
890 pci_pm_reenable_device(pci_dev);
893 pci_dev->state_saved = false;
898 static int pci_pm_poweroff(struct device *dev)
900 struct pci_dev *pci_dev = to_pci_dev(dev);
901 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
903 if (pci_has_legacy_pm_support(pci_dev))
904 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
907 pci_pm_default_suspend(pci_dev);
914 error = pm->poweroff(dev);
915 suspend_report_result(pm->poweroff, error);
921 pci_fixup_device(pci_fixup_suspend, pci_dev);
926 static int pci_pm_poweroff_noirq(struct device *dev)
928 struct pci_dev *pci_dev = to_pci_dev(dev);
929 struct device_driver *drv = dev->driver;
931 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
932 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
934 if (!drv || !drv->pm)
937 if (drv->pm->poweroff_noirq) {
940 error = drv->pm->poweroff_noirq(dev);
941 suspend_report_result(drv->pm->poweroff_noirq, error);
946 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
947 pci_prepare_to_sleep(pci_dev);
952 static int pci_pm_restore_noirq(struct device *dev)
954 struct pci_dev *pci_dev = to_pci_dev(dev);
955 struct device_driver *drv = dev->driver;
958 pci_pm_default_resume_early(pci_dev);
960 if (pci_has_legacy_pm_support(pci_dev))
961 return pci_legacy_resume_early(dev);
963 if (drv && drv->pm && drv->pm->restore_noirq)
964 error = drv->pm->restore_noirq(dev);
969 static int pci_pm_restore(struct device *dev)
971 struct pci_dev *pci_dev = to_pci_dev(dev);
972 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
976 * This is necessary for the hibernation error path in which restore is
977 * called without restoring the standard config registers of the device.
979 if (pci_dev->state_saved)
980 pci_restore_standard_config(pci_dev);
982 if (pci_has_legacy_pm_support(pci_dev))
983 return pci_legacy_resume(dev);
985 pci_pm_default_resume(pci_dev);
989 error = pm->restore(dev);
991 pci_pm_reenable_device(pci_dev);
997 #else /* !CONFIG_HIBERNATE_CALLBACKS */
999 #define pci_pm_freeze NULL
1000 #define pci_pm_freeze_noirq NULL
1001 #define pci_pm_thaw NULL
1002 #define pci_pm_thaw_noirq NULL
1003 #define pci_pm_poweroff NULL
1004 #define pci_pm_poweroff_noirq NULL
1005 #define pci_pm_restore NULL
1006 #define pci_pm_restore_noirq NULL
1008 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1010 #ifdef CONFIG_PM_RUNTIME
1012 static int pci_pm_runtime_suspend(struct device *dev)
1014 struct pci_dev *pci_dev = to_pci_dev(dev);
1015 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1016 pci_power_t prev = pci_dev->current_state;
1019 if (!pm || !pm->runtime_suspend)
1022 error = pm->runtime_suspend(dev);
1023 suspend_report_result(pm->runtime_suspend, error);
1027 pci_fixup_device(pci_fixup_suspend, pci_dev);
1029 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1030 && pci_dev->current_state != PCI_UNKNOWN) {
1031 WARN_ONCE(pci_dev->current_state != prev,
1032 "PCI PM: State of device not saved by %pF\n",
1033 pm->runtime_suspend);
1037 if (!pci_dev->state_saved)
1038 pci_save_state(pci_dev);
1040 pci_finish_runtime_suspend(pci_dev);
1045 static int pci_pm_runtime_resume(struct device *dev)
1047 struct pci_dev *pci_dev = to_pci_dev(dev);
1048 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1050 if (!pm || !pm->runtime_resume)
1053 pci_pm_default_resume_early(pci_dev);
1054 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1055 pci_fixup_device(pci_fixup_resume, pci_dev);
1057 return pm->runtime_resume(dev);
1060 static int pci_pm_runtime_idle(struct device *dev)
1062 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1067 if (pm->runtime_idle) {
1068 int ret = pm->runtime_idle(dev);
1073 pm_runtime_suspend(dev);
1078 #else /* !CONFIG_PM_RUNTIME */
1080 #define pci_pm_runtime_suspend NULL
1081 #define pci_pm_runtime_resume NULL
1082 #define pci_pm_runtime_idle NULL
1084 #endif /* !CONFIG_PM_RUNTIME */
1088 const struct dev_pm_ops pci_dev_pm_ops = {
1089 .prepare = pci_pm_prepare,
1090 .complete = pci_pm_complete,
1091 .suspend = pci_pm_suspend,
1092 .resume = pci_pm_resume,
1093 .freeze = pci_pm_freeze,
1094 .thaw = pci_pm_thaw,
1095 .poweroff = pci_pm_poweroff,
1096 .restore = pci_pm_restore,
1097 .suspend_noirq = pci_pm_suspend_noirq,
1098 .resume_noirq = pci_pm_resume_noirq,
1099 .freeze_noirq = pci_pm_freeze_noirq,
1100 .thaw_noirq = pci_pm_thaw_noirq,
1101 .poweroff_noirq = pci_pm_poweroff_noirq,
1102 .restore_noirq = pci_pm_restore_noirq,
1103 .runtime_suspend = pci_pm_runtime_suspend,
1104 .runtime_resume = pci_pm_runtime_resume,
1105 .runtime_idle = pci_pm_runtime_idle,
1108 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1110 #else /* !COMFIG_PM_OPS */
1112 #define PCI_PM_OPS_PTR NULL
1114 #endif /* !COMFIG_PM_OPS */
1117 * __pci_register_driver - register a new pci driver
1118 * @drv: the driver structure to register
1119 * @owner: owner module of drv
1120 * @mod_name: module name string
1122 * Adds the driver structure to the list of registered drivers.
1123 * Returns a negative value on error, otherwise 0.
1124 * If no error occurred, the driver remains registered even if
1125 * no device was claimed during registration.
1127 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1128 const char *mod_name)
1132 /* initialize common driver fields */
1133 drv->driver.name = drv->name;
1134 drv->driver.bus = &pci_bus_type;
1135 drv->driver.owner = owner;
1136 drv->driver.mod_name = mod_name;
1138 spin_lock_init(&drv->dynids.lock);
1139 INIT_LIST_HEAD(&drv->dynids.list);
1141 /* register with core */
1142 error = driver_register(&drv->driver);
1146 error = pci_create_newid_files(drv);
1153 driver_unregister(&drv->driver);
1158 * pci_unregister_driver - unregister a pci driver
1159 * @drv: the driver structure to unregister
1161 * Deletes the driver structure from the list of registered PCI drivers,
1162 * gives it a chance to clean up by calling its remove() function for
1163 * each device it was responsible for, and marks those devices as
1168 pci_unregister_driver(struct pci_driver *drv)
1170 pci_remove_newid_files(drv);
1171 driver_unregister(&drv->driver);
1172 pci_free_dynids(drv);
1175 static struct pci_driver pci_compat_driver = {
1180 * pci_dev_driver - get the pci_driver of a device
1181 * @dev: the device to query
1183 * Returns the appropriate pci_driver structure or %NULL if there is no
1184 * registered driver for the device.
1187 pci_dev_driver(const struct pci_dev *dev)
1193 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1194 if (dev->resource[i].flags & IORESOURCE_BUSY)
1195 return &pci_compat_driver;
1201 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1202 * @dev: the PCI device structure to match against
1203 * @drv: the device driver to search for matching PCI device id structures
1205 * Used by a driver to check whether a PCI device present in the
1206 * system is in its list of supported devices. Returns the matching
1207 * pci_device_id structure or %NULL if there is no match.
1209 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1211 struct pci_dev *pci_dev = to_pci_dev(dev);
1212 struct pci_driver *pci_drv = to_pci_driver(drv);
1213 const struct pci_device_id *found_id;
1215 found_id = pci_match_device(pci_drv, pci_dev);
1223 * pci_dev_get - increments the reference count of the pci device structure
1224 * @dev: the device being referenced
1226 * Each live reference to a device should be refcounted.
1228 * Drivers for PCI devices should normally record such references in
1229 * their probe() methods, when they bind to a device, and release
1230 * them by calling pci_dev_put(), in their disconnect() methods.
1232 * A pointer to the device with the incremented reference counter is returned.
1234 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1237 get_device(&dev->dev);
1242 * pci_dev_put - release a use of the pci device structure
1243 * @dev: device that's been disconnected
1245 * Must be called when a user of a device is finished with it. When the last
1246 * user of the device calls this function, the memory of the device is freed.
1248 void pci_dev_put(struct pci_dev *dev)
1251 put_device(&dev->dev);
1254 #ifndef CONFIG_HOTPLUG
1255 int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1261 struct bus_type pci_bus_type = {
1263 .match = pci_bus_match,
1264 .uevent = pci_uevent,
1265 .probe = pci_device_probe,
1266 .remove = pci_device_remove,
1267 .shutdown = pci_device_shutdown,
1268 .dev_attrs = pci_dev_attrs,
1269 .bus_attrs = pci_bus_attrs,
1270 .pm = PCI_PM_OPS_PTR,
1273 static int __init pci_driver_init(void)
1275 return bus_register(&pci_bus_type);
1278 postcore_initcall(pci_driver_init);
1280 EXPORT_SYMBOL_GPL(pci_add_dynid);
1281 EXPORT_SYMBOL(pci_match_id);
1282 EXPORT_SYMBOL(__pci_register_driver);
1283 EXPORT_SYMBOL(pci_unregister_driver);
1284 EXPORT_SYMBOL(pci_dev_driver);
1285 EXPORT_SYMBOL(pci_bus_type);
1286 EXPORT_SYMBOL(pci_dev_get);
1287 EXPORT_SYMBOL(pci_dev_put);