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 * store_new_id - sysfs frontend to pci_add_dynid()
94 * @driver: target device driver
95 * @buf: buffer for scanning device ID data
98 * Allow PCI IDs to be added to an existing driver via sysfs.
101 store_new_id(struct device_driver *driver, const char *buf, size_t count)
103 struct pci_driver *pdrv = to_pci_driver(driver);
104 const struct pci_device_id *ids = pdrv->id_table;
105 __u32 vendor, device, subvendor=PCI_ANY_ID,
106 subdevice=PCI_ANY_ID, class=0, class_mask=0;
107 unsigned long driver_data=0;
111 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
112 &vendor, &device, &subvendor, &subdevice,
113 &class, &class_mask, &driver_data);
117 /* Only accept driver_data values that match an existing id_table
121 while (ids->vendor || ids->subvendor || ids->class_mask) {
122 if (driver_data == ids->driver_data) {
128 if (retval) /* No match */
132 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
133 class, class_mask, driver_data);
138 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
141 * store_remove_id - remove a PCI device ID from this driver
142 * @driver: target device driver
143 * @buf: buffer for scanning device ID data
146 * Removes a dynamic pci device ID to this driver.
149 store_remove_id(struct device_driver *driver, const char *buf, size_t count)
151 struct pci_dynid *dynid, *n;
152 struct pci_driver *pdrv = to_pci_driver(driver);
153 __u32 vendor, device, subvendor = PCI_ANY_ID,
154 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
156 int retval = -ENODEV;
158 fields = sscanf(buf, "%x %x %x %x %x %x",
159 &vendor, &device, &subvendor, &subdevice,
160 &class, &class_mask);
164 spin_lock(&pdrv->dynids.lock);
165 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
166 struct pci_device_id *id = &dynid->id;
167 if ((id->vendor == vendor) &&
168 (id->device == device) &&
169 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
170 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
171 !((id->class ^ class) & class_mask)) {
172 list_del(&dynid->node);
178 spin_unlock(&pdrv->dynids.lock);
184 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
186 static struct attribute *pci_drv_attrs[] = {
187 &driver_attr_new_id.attr,
188 &driver_attr_remove_id.attr,
191 ATTRIBUTE_GROUPS(pci_drv);
194 * pci_match_id - See if a pci device matches a given pci_id table
195 * @ids: array of PCI device id structures to search in
196 * @dev: the PCI device structure to match against.
198 * Used by a driver to check whether a PCI device present in the
199 * system is in its list of supported devices. Returns the matching
200 * pci_device_id structure or %NULL if there is no match.
202 * Deprecated, don't use this as it will not catch any dynamic ids
203 * that a driver might want to check for.
205 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
209 while (ids->vendor || ids->subvendor || ids->class_mask) {
210 if (pci_match_one_device(ids, dev))
219 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
220 * @drv: the PCI driver to match against
221 * @dev: the PCI device structure to match against
223 * Used by a driver to check whether a PCI device present in the
224 * system is in its list of supported devices. Returns the matching
225 * pci_device_id structure or %NULL if there is no match.
227 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
230 struct pci_dynid *dynid;
232 /* Look at the dynamic ids first, before the static ones */
233 spin_lock(&drv->dynids.lock);
234 list_for_each_entry(dynid, &drv->dynids.list, node) {
235 if (pci_match_one_device(&dynid->id, dev)) {
236 spin_unlock(&drv->dynids.lock);
240 spin_unlock(&drv->dynids.lock);
242 return pci_match_id(drv->id_table, dev);
245 struct drv_dev_and_id {
246 struct pci_driver *drv;
248 const struct pci_device_id *id;
251 static long local_pci_probe(void *_ddi)
253 struct drv_dev_and_id *ddi = _ddi;
254 struct pci_dev *pci_dev = ddi->dev;
255 struct pci_driver *pci_drv = ddi->drv;
256 struct device *dev = &pci_dev->dev;
260 * Unbound PCI devices are always put in D0, regardless of
261 * runtime PM status. During probe, the device is set to
262 * active and the usage count is incremented. If the driver
263 * supports runtime PM, it should call pm_runtime_put_noidle()
264 * in its probe routine and pm_runtime_get_noresume() in its
267 pm_runtime_get_sync(dev);
268 pci_dev->driver = pci_drv;
269 rc = pci_drv->probe(pci_dev, ddi->id);
271 pci_dev->driver = NULL;
272 pm_runtime_put_sync(dev);
277 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
278 const struct pci_device_id *id)
281 struct drv_dev_and_id ddi = { drv, dev, id };
283 /* Execute driver initialization on node where the device's
284 bus is attached to. This way the driver likely allocates
285 its local memory on the right node without any need to
287 node = dev_to_node(&dev->dev);
292 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
293 if (cpu < nr_cpu_ids)
294 error = work_on_cpu(cpu, local_pci_probe, &ddi);
296 error = local_pci_probe(&ddi);
299 error = local_pci_probe(&ddi);
304 * __pci_device_probe - check if a driver wants to claim a specific PCI device
305 * @drv: driver to call to check if it wants the PCI device
306 * @pci_dev: PCI device being probed
308 * returns 0 on success, else error.
309 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
312 __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
314 const struct pci_device_id *id;
317 if (!pci_dev->driver && drv->probe) {
320 id = pci_match_device(drv, pci_dev);
322 error = pci_call_probe(drv, pci_dev, id);
329 static int pci_device_probe(struct device * dev)
332 struct pci_driver *drv;
333 struct pci_dev *pci_dev;
335 drv = to_pci_driver(dev->driver);
336 pci_dev = to_pci_dev(dev);
337 pci_dev_get(pci_dev);
338 error = __pci_device_probe(drv, pci_dev);
340 pci_dev_put(pci_dev);
345 static int pci_device_remove(struct device * dev)
347 struct pci_dev * pci_dev = to_pci_dev(dev);
348 struct pci_driver * drv = pci_dev->driver;
352 pm_runtime_get_sync(dev);
353 drv->remove(pci_dev);
354 pm_runtime_put_noidle(dev);
356 pci_dev->driver = NULL;
359 /* Undo the runtime PM settings in local_pci_probe() */
360 pm_runtime_put_sync(dev);
363 * If the device is still on, set the power state as "unknown",
364 * since it might change by the next time we load the driver.
366 if (pci_dev->current_state == PCI_D0)
367 pci_dev->current_state = PCI_UNKNOWN;
370 * We would love to complain here if pci_dev->is_enabled is set, that
371 * the driver should have called pci_disable_device(), but the
372 * unfortunate fact is there are too many odd BIOS and bridge setups
373 * that don't like drivers doing that all of the time.
374 * Oh well, we can dream of sane hardware when we sleep, no matter how
375 * horrible the crap we have to deal with is when we are awake...
378 pci_dev_put(pci_dev);
382 static void pci_device_shutdown(struct device *dev)
384 struct pci_dev *pci_dev = to_pci_dev(dev);
385 struct pci_driver *drv = pci_dev->driver;
387 pm_runtime_resume(dev);
389 if (drv && drv->shutdown)
390 drv->shutdown(pci_dev);
391 pci_msi_shutdown(pci_dev);
392 pci_msix_shutdown(pci_dev);
395 * Turn off Bus Master bit on the device to tell it to not
396 * continue to do DMA. Don't touch devices in D3cold or unknown states.
398 if (pci_dev->current_state <= PCI_D3hot)
399 pci_clear_master(pci_dev);
404 /* Auxiliary functions used for system resume and run-time resume. */
407 * pci_restore_standard_config - restore standard config registers of PCI device
408 * @pci_dev: PCI device to handle
410 static int pci_restore_standard_config(struct pci_dev *pci_dev)
412 pci_update_current_state(pci_dev, PCI_UNKNOWN);
414 if (pci_dev->current_state != PCI_D0) {
415 int error = pci_set_power_state(pci_dev, PCI_D0);
420 pci_restore_state(pci_dev);
426 #ifdef CONFIG_PM_SLEEP
428 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
430 pci_power_up(pci_dev);
431 pci_restore_state(pci_dev);
432 pci_fixup_device(pci_fixup_resume_early, pci_dev);
436 * Default "suspend" method for devices that have no driver provided suspend,
437 * or not even a driver at all (second part).
439 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
442 * mark its power state as "unknown", since we don't know if
443 * e.g. the BIOS will change its device state when we suspend.
445 if (pci_dev->current_state == PCI_D0)
446 pci_dev->current_state = PCI_UNKNOWN;
450 * Default "resume" method for devices that have no driver provided resume,
451 * or not even a driver at all (second part).
453 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
457 /* if the device was enabled before suspend, reenable */
458 retval = pci_reenable_device(pci_dev);
460 * if the device was busmaster before the suspend, make it busmaster
463 if (pci_dev->is_busmaster)
464 pci_set_master(pci_dev);
469 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
471 struct pci_dev * pci_dev = to_pci_dev(dev);
472 struct pci_driver * drv = pci_dev->driver;
474 if (drv && drv->suspend) {
475 pci_power_t prev = pci_dev->current_state;
478 error = drv->suspend(pci_dev, state);
479 suspend_report_result(drv->suspend, error);
483 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
484 && pci_dev->current_state != PCI_UNKNOWN) {
485 WARN_ONCE(pci_dev->current_state != prev,
486 "PCI PM: Device state not saved by %pF\n",
491 pci_fixup_device(pci_fixup_suspend, pci_dev);
496 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
498 struct pci_dev * pci_dev = to_pci_dev(dev);
499 struct pci_driver * drv = pci_dev->driver;
501 if (drv && drv->suspend_late) {
502 pci_power_t prev = pci_dev->current_state;
505 error = drv->suspend_late(pci_dev, state);
506 suspend_report_result(drv->suspend_late, error);
510 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
511 && pci_dev->current_state != PCI_UNKNOWN) {
512 WARN_ONCE(pci_dev->current_state != prev,
513 "PCI PM: Device state not saved by %pF\n",
519 if (!pci_dev->state_saved)
520 pci_save_state(pci_dev);
522 pci_pm_set_unknown_state(pci_dev);
527 static int pci_legacy_resume_early(struct device *dev)
529 struct pci_dev * pci_dev = to_pci_dev(dev);
530 struct pci_driver * drv = pci_dev->driver;
532 return drv && drv->resume_early ?
533 drv->resume_early(pci_dev) : 0;
536 static int pci_legacy_resume(struct device *dev)
538 struct pci_dev * pci_dev = to_pci_dev(dev);
539 struct pci_driver * drv = pci_dev->driver;
541 pci_fixup_device(pci_fixup_resume, pci_dev);
543 return drv && drv->resume ?
544 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
547 /* Auxiliary functions used by the new power management framework */
549 static void pci_pm_default_resume(struct pci_dev *pci_dev)
551 pci_fixup_device(pci_fixup_resume, pci_dev);
553 if (!pci_is_bridge(pci_dev))
554 pci_enable_wake(pci_dev, PCI_D0, false);
557 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
559 /* Disable non-bridge devices without PM support */
560 if (!pci_is_bridge(pci_dev))
561 pci_disable_enabled_device(pci_dev);
564 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
566 struct pci_driver *drv = pci_dev->driver;
567 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
568 || drv->resume_early);
571 * Legacy PM support is used by default, so warn if the new framework is
572 * supported as well. Drivers are supposed to support either the
573 * former, or the latter, but not both at the same time.
575 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
576 drv->name, pci_dev->vendor, pci_dev->device);
581 /* New power management framework */
583 static int pci_pm_prepare(struct device *dev)
585 struct device_driver *drv = dev->driver;
589 * PCI devices suspended at run time need to be resumed at this
590 * point, because in general it is necessary to reconfigure them for
591 * system suspend. Namely, if the device is supposed to wake up the
592 * system from the sleep state, we may need to reconfigure it for this
593 * purpose. In turn, if the device is not supposed to wake up the
594 * system from the sleep state, we'll have to prevent it from signaling
597 pm_runtime_resume(dev);
599 if (drv && drv->pm && drv->pm->prepare)
600 error = drv->pm->prepare(dev);
606 #else /* !CONFIG_PM_SLEEP */
608 #define pci_pm_prepare NULL
610 #endif /* !CONFIG_PM_SLEEP */
612 #ifdef CONFIG_SUSPEND
614 static int pci_pm_suspend(struct device *dev)
616 struct pci_dev *pci_dev = to_pci_dev(dev);
617 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
619 if (pci_has_legacy_pm_support(pci_dev))
620 return pci_legacy_suspend(dev, PMSG_SUSPEND);
623 pci_pm_default_suspend(pci_dev);
627 pci_dev->state_saved = false;
629 pci_power_t prev = pci_dev->current_state;
632 error = pm->suspend(dev);
633 suspend_report_result(pm->suspend, error);
637 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
638 && pci_dev->current_state != PCI_UNKNOWN) {
639 WARN_ONCE(pci_dev->current_state != prev,
640 "PCI PM: State of device not saved by %pF\n",
646 pci_fixup_device(pci_fixup_suspend, pci_dev);
651 static int pci_pm_suspend_noirq(struct device *dev)
653 struct pci_dev *pci_dev = to_pci_dev(dev);
654 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
656 if (pci_has_legacy_pm_support(pci_dev))
657 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
660 pci_save_state(pci_dev);
664 if (pm->suspend_noirq) {
665 pci_power_t prev = pci_dev->current_state;
668 error = pm->suspend_noirq(dev);
669 suspend_report_result(pm->suspend_noirq, error);
673 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
674 && pci_dev->current_state != PCI_UNKNOWN) {
675 WARN_ONCE(pci_dev->current_state != prev,
676 "PCI PM: State of device not saved by %pF\n",
682 if (!pci_dev->state_saved) {
683 pci_save_state(pci_dev);
684 if (!pci_is_bridge(pci_dev))
685 pci_prepare_to_sleep(pci_dev);
688 pci_pm_set_unknown_state(pci_dev);
691 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
692 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
693 * hasn't been quiesced and tries to turn it off. If the controller
694 * is already in D3, this can hang or cause memory corruption.
696 * Since the value of the COMMAND register doesn't matter once the
697 * device has been suspended, we can safely set it to 0 here.
699 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
700 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
705 static int pci_pm_resume_noirq(struct device *dev)
707 struct pci_dev *pci_dev = to_pci_dev(dev);
708 struct device_driver *drv = dev->driver;
711 pci_pm_default_resume_early(pci_dev);
713 if (pci_has_legacy_pm_support(pci_dev))
714 return pci_legacy_resume_early(dev);
716 if (drv && drv->pm && drv->pm->resume_noirq)
717 error = drv->pm->resume_noirq(dev);
722 static int pci_pm_resume(struct device *dev)
724 struct pci_dev *pci_dev = to_pci_dev(dev);
725 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
729 * This is necessary for the suspend error path in which resume is
730 * called without restoring the standard config registers of the device.
732 if (pci_dev->state_saved)
733 pci_restore_standard_config(pci_dev);
735 if (pci_has_legacy_pm_support(pci_dev))
736 return pci_legacy_resume(dev);
738 pci_pm_default_resume(pci_dev);
742 error = pm->resume(dev);
744 pci_pm_reenable_device(pci_dev);
750 #else /* !CONFIG_SUSPEND */
752 #define pci_pm_suspend NULL
753 #define pci_pm_suspend_noirq NULL
754 #define pci_pm_resume NULL
755 #define pci_pm_resume_noirq NULL
757 #endif /* !CONFIG_SUSPEND */
759 #ifdef CONFIG_HIBERNATE_CALLBACKS
763 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
764 * a hibernate transition
766 struct dev_pm_ops __weak pcibios_pm_ops;
768 static int pci_pm_freeze(struct device *dev)
770 struct pci_dev *pci_dev = to_pci_dev(dev);
771 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
773 if (pci_has_legacy_pm_support(pci_dev))
774 return pci_legacy_suspend(dev, PMSG_FREEZE);
777 pci_pm_default_suspend(pci_dev);
781 pci_dev->state_saved = false;
785 error = pm->freeze(dev);
786 suspend_report_result(pm->freeze, error);
791 if (pcibios_pm_ops.freeze)
792 return pcibios_pm_ops.freeze(dev);
797 static int pci_pm_freeze_noirq(struct device *dev)
799 struct pci_dev *pci_dev = to_pci_dev(dev);
800 struct device_driver *drv = dev->driver;
802 if (pci_has_legacy_pm_support(pci_dev))
803 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
805 if (drv && drv->pm && drv->pm->freeze_noirq) {
808 error = drv->pm->freeze_noirq(dev);
809 suspend_report_result(drv->pm->freeze_noirq, error);
814 if (!pci_dev->state_saved)
815 pci_save_state(pci_dev);
817 pci_pm_set_unknown_state(pci_dev);
819 if (pcibios_pm_ops.freeze_noirq)
820 return pcibios_pm_ops.freeze_noirq(dev);
825 static int pci_pm_thaw_noirq(struct device *dev)
827 struct pci_dev *pci_dev = to_pci_dev(dev);
828 struct device_driver *drv = dev->driver;
831 if (pcibios_pm_ops.thaw_noirq) {
832 error = pcibios_pm_ops.thaw_noirq(dev);
837 if (pci_has_legacy_pm_support(pci_dev))
838 return pci_legacy_resume_early(dev);
840 pci_update_current_state(pci_dev, PCI_D0);
842 if (drv && drv->pm && drv->pm->thaw_noirq)
843 error = drv->pm->thaw_noirq(dev);
848 static int pci_pm_thaw(struct device *dev)
850 struct pci_dev *pci_dev = to_pci_dev(dev);
851 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
854 if (pcibios_pm_ops.thaw) {
855 error = pcibios_pm_ops.thaw(dev);
860 if (pci_has_legacy_pm_support(pci_dev))
861 return pci_legacy_resume(dev);
865 error = pm->thaw(dev);
867 pci_pm_reenable_device(pci_dev);
870 pci_dev->state_saved = false;
875 static int pci_pm_poweroff(struct device *dev)
877 struct pci_dev *pci_dev = to_pci_dev(dev);
878 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
880 if (pci_has_legacy_pm_support(pci_dev))
881 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
884 pci_pm_default_suspend(pci_dev);
888 pci_dev->state_saved = false;
892 error = pm->poweroff(dev);
893 suspend_report_result(pm->poweroff, error);
899 pci_fixup_device(pci_fixup_suspend, pci_dev);
901 if (pcibios_pm_ops.poweroff)
902 return pcibios_pm_ops.poweroff(dev);
907 static int pci_pm_poweroff_noirq(struct device *dev)
909 struct pci_dev *pci_dev = to_pci_dev(dev);
910 struct device_driver *drv = dev->driver;
912 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
913 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
915 if (!drv || !drv->pm)
918 if (drv->pm->poweroff_noirq) {
921 error = drv->pm->poweroff_noirq(dev);
922 suspend_report_result(drv->pm->poweroff_noirq, error);
927 if (!pci_dev->state_saved && !pci_is_bridge(pci_dev))
928 pci_prepare_to_sleep(pci_dev);
931 * The reason for doing this here is the same as for the analogous code
932 * in pci_pm_suspend_noirq().
934 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
935 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
937 if (pcibios_pm_ops.poweroff_noirq)
938 return pcibios_pm_ops.poweroff_noirq(dev);
943 static int pci_pm_restore_noirq(struct device *dev)
945 struct pci_dev *pci_dev = to_pci_dev(dev);
946 struct device_driver *drv = dev->driver;
949 if (pcibios_pm_ops.restore_noirq) {
950 error = pcibios_pm_ops.restore_noirq(dev);
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;
972 if (pcibios_pm_ops.restore) {
973 error = pcibios_pm_ops.restore(dev);
979 * This is necessary for the hibernation error path in which restore is
980 * called without restoring the standard config registers of the device.
982 if (pci_dev->state_saved)
983 pci_restore_standard_config(pci_dev);
985 if (pci_has_legacy_pm_support(pci_dev))
986 return pci_legacy_resume(dev);
988 pci_pm_default_resume(pci_dev);
992 error = pm->restore(dev);
994 pci_pm_reenable_device(pci_dev);
1000 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1002 #define pci_pm_freeze NULL
1003 #define pci_pm_freeze_noirq NULL
1004 #define pci_pm_thaw NULL
1005 #define pci_pm_thaw_noirq NULL
1006 #define pci_pm_poweroff NULL
1007 #define pci_pm_poweroff_noirq NULL
1008 #define pci_pm_restore NULL
1009 #define pci_pm_restore_noirq NULL
1011 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1013 #ifdef CONFIG_PM_RUNTIME
1015 static int pci_pm_runtime_suspend(struct device *dev)
1017 struct pci_dev *pci_dev = to_pci_dev(dev);
1018 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1019 pci_power_t prev = pci_dev->current_state;
1023 * If pci_dev->driver is not set (unbound), the device should
1024 * always remain in D0 regardless of the runtime PM status
1026 if (!pci_dev->driver)
1029 if (!pm || !pm->runtime_suspend)
1032 pci_dev->state_saved = false;
1033 pci_dev->no_d3cold = false;
1034 error = pm->runtime_suspend(dev);
1035 suspend_report_result(pm->runtime_suspend, error);
1038 if (!pci_dev->d3cold_allowed)
1039 pci_dev->no_d3cold = true;
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);
1053 pci_finish_runtime_suspend(pci_dev);
1059 static int pci_pm_runtime_resume(struct device *dev)
1062 struct pci_dev *pci_dev = to_pci_dev(dev);
1063 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1066 * If pci_dev->driver is not set (unbound), the device should
1067 * always remain in D0 regardless of the runtime PM status
1069 if (!pci_dev->driver)
1072 if (!pm || !pm->runtime_resume)
1075 pci_restore_standard_config(pci_dev);
1076 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1077 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1078 pci_fixup_device(pci_fixup_resume, pci_dev);
1080 rc = pm->runtime_resume(dev);
1082 pci_dev->runtime_d3cold = false;
1087 static int pci_pm_runtime_idle(struct device *dev)
1089 struct pci_dev *pci_dev = to_pci_dev(dev);
1090 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1094 * If pci_dev->driver is not set (unbound), the device should
1095 * always remain in D0 regardless of the runtime PM status
1097 if (!pci_dev->driver)
1103 if (pm->runtime_idle)
1104 ret = pm->runtime_idle(dev);
1109 #else /* !CONFIG_PM_RUNTIME */
1111 #define pci_pm_runtime_suspend NULL
1112 #define pci_pm_runtime_resume NULL
1113 #define pci_pm_runtime_idle NULL
1115 #endif /* !CONFIG_PM_RUNTIME */
1119 static const struct dev_pm_ops pci_dev_pm_ops = {
1120 .prepare = pci_pm_prepare,
1121 .suspend = pci_pm_suspend,
1122 .resume = pci_pm_resume,
1123 .freeze = pci_pm_freeze,
1124 .thaw = pci_pm_thaw,
1125 .poweroff = pci_pm_poweroff,
1126 .restore = pci_pm_restore,
1127 .suspend_noirq = pci_pm_suspend_noirq,
1128 .resume_noirq = pci_pm_resume_noirq,
1129 .freeze_noirq = pci_pm_freeze_noirq,
1130 .thaw_noirq = pci_pm_thaw_noirq,
1131 .poweroff_noirq = pci_pm_poweroff_noirq,
1132 .restore_noirq = pci_pm_restore_noirq,
1133 .runtime_suspend = pci_pm_runtime_suspend,
1134 .runtime_resume = pci_pm_runtime_resume,
1135 .runtime_idle = pci_pm_runtime_idle,
1138 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1140 #else /* !COMFIG_PM_OPS */
1142 #define PCI_PM_OPS_PTR NULL
1144 #endif /* !COMFIG_PM_OPS */
1147 * __pci_register_driver - register a new pci driver
1148 * @drv: the driver structure to register
1149 * @owner: owner module of drv
1150 * @mod_name: module name string
1152 * Adds the driver structure to the list of registered drivers.
1153 * Returns a negative value on error, otherwise 0.
1154 * If no error occurred, the driver remains registered even if
1155 * no device was claimed during registration.
1157 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1158 const char *mod_name)
1160 /* initialize common driver fields */
1161 drv->driver.name = drv->name;
1162 drv->driver.bus = &pci_bus_type;
1163 drv->driver.owner = owner;
1164 drv->driver.mod_name = mod_name;
1166 spin_lock_init(&drv->dynids.lock);
1167 INIT_LIST_HEAD(&drv->dynids.list);
1169 /* register with core */
1170 return driver_register(&drv->driver);
1174 * pci_unregister_driver - unregister a pci driver
1175 * @drv: the driver structure to unregister
1177 * Deletes the driver structure from the list of registered PCI drivers,
1178 * gives it a chance to clean up by calling its remove() function for
1179 * each device it was responsible for, and marks those devices as
1184 pci_unregister_driver(struct pci_driver *drv)
1186 driver_unregister(&drv->driver);
1187 pci_free_dynids(drv);
1190 static struct pci_driver pci_compat_driver = {
1195 * pci_dev_driver - get the pci_driver of a device
1196 * @dev: the device to query
1198 * Returns the appropriate pci_driver structure or %NULL if there is no
1199 * registered driver for the device.
1202 pci_dev_driver(const struct pci_dev *dev)
1208 for(i=0; i<=PCI_ROM_RESOURCE; i++)
1209 if (dev->resource[i].flags & IORESOURCE_BUSY)
1210 return &pci_compat_driver;
1216 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1217 * @dev: the PCI device structure to match against
1218 * @drv: the device driver to search for matching PCI device id structures
1220 * Used by a driver to check whether a PCI device present in the
1221 * system is in its list of supported devices. Returns the matching
1222 * pci_device_id structure or %NULL if there is no match.
1224 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1226 struct pci_dev *pci_dev = to_pci_dev(dev);
1227 struct pci_driver *pci_drv;
1228 const struct pci_device_id *found_id;
1230 if (!pci_dev->match_driver)
1233 pci_drv = to_pci_driver(drv);
1234 found_id = pci_match_device(pci_drv, pci_dev);
1242 * pci_dev_get - increments the reference count of the pci device structure
1243 * @dev: the device being referenced
1245 * Each live reference to a device should be refcounted.
1247 * Drivers for PCI devices should normally record such references in
1248 * their probe() methods, when they bind to a device, and release
1249 * them by calling pci_dev_put(), in their disconnect() methods.
1251 * A pointer to the device with the incremented reference counter is returned.
1253 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1256 get_device(&dev->dev);
1261 * pci_dev_put - release a use of the pci device structure
1262 * @dev: device that's been disconnected
1264 * Must be called when a user of a device is finished with it. When the last
1265 * user of the device calls this function, the memory of the device is freed.
1267 void pci_dev_put(struct pci_dev *dev)
1270 put_device(&dev->dev);
1273 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1275 struct pci_dev *pdev;
1280 pdev = to_pci_dev(dev);
1284 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1287 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1290 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1291 pdev->subsystem_device))
1294 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1297 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1298 pdev->vendor, pdev->device,
1299 pdev->subsystem_vendor, pdev->subsystem_device,
1300 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1306 struct bus_type pci_bus_type = {
1308 .match = pci_bus_match,
1309 .uevent = pci_uevent,
1310 .probe = pci_device_probe,
1311 .remove = pci_device_remove,
1312 .shutdown = pci_device_shutdown,
1313 .dev_groups = pci_dev_groups,
1314 .bus_groups = pci_bus_groups,
1315 .drv_groups = pci_drv_groups,
1316 .pm = PCI_PM_OPS_PTR,
1319 static int __init pci_driver_init(void)
1321 return bus_register(&pci_bus_type);
1324 postcore_initcall(pci_driver_init);
1326 EXPORT_SYMBOL_GPL(pci_add_dynid);
1327 EXPORT_SYMBOL(pci_match_id);
1328 EXPORT_SYMBOL(__pci_register_driver);
1329 EXPORT_SYMBOL(pci_unregister_driver);
1330 EXPORT_SYMBOL(pci_dev_driver);
1331 EXPORT_SYMBOL(pci_bus_type);
1332 EXPORT_SYMBOL(pci_dev_get);
1333 EXPORT_SYMBOL(pci_dev_put);