2 * drivers/pci/pci-driver.c
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>
22 #include <linux/kexec.h>
26 struct list_head node;
27 struct pci_device_id id;
31 * pci_add_dynid - add a new PCI device ID to this driver and re-probe devices
32 * @drv: target pci driver
33 * @vendor: PCI vendor ID
34 * @device: PCI device ID
35 * @subvendor: PCI subvendor ID
36 * @subdevice: PCI subdevice ID
38 * @class_mask: PCI class mask
39 * @driver_data: private driver data
41 * Adds a new dynamic pci device ID to this driver and causes the
42 * driver to probe for all devices again. @drv must have been
43 * registered prior to calling this function.
46 * Does GFP_KERNEL allocation.
49 * 0 on success, -errno on failure.
51 int pci_add_dynid(struct pci_driver *drv,
52 unsigned int vendor, unsigned int device,
53 unsigned int subvendor, unsigned int subdevice,
54 unsigned int class, unsigned int class_mask,
55 unsigned long driver_data)
57 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 return driver_attach(&drv->driver);
77 EXPORT_SYMBOL_GPL(pci_add_dynid);
79 static void pci_free_dynids(struct pci_driver *drv)
81 struct pci_dynid *dynid, *n;
83 spin_lock(&drv->dynids.lock);
84 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
85 list_del(&dynid->node);
88 spin_unlock(&drv->dynids.lock);
92 * store_new_id - sysfs frontend to pci_add_dynid()
93 * @driver: target device driver
94 * @buf: buffer for scanning device ID data
97 * Allow PCI IDs to be added to an existing driver via sysfs.
99 static ssize_t store_new_id(struct device_driver *driver, const char *buf,
102 struct pci_driver *pdrv = to_pci_driver(driver);
103 const struct pci_device_id *ids = pdrv->id_table;
104 __u32 vendor, device, subvendor = PCI_ANY_ID,
105 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
106 unsigned long driver_data = 0;
110 fields = sscanf(buf, "%x %x %x %x %x %x %lx",
111 &vendor, &device, &subvendor, &subdevice,
112 &class, &class_mask, &driver_data);
117 struct pci_dev *pdev = kzalloc(sizeof(*pdev), GFP_KERNEL);
121 pdev->vendor = vendor;
122 pdev->device = device;
123 pdev->subsystem_vendor = subvendor;
124 pdev->subsystem_device = subdevice;
127 if (pci_match_id(pdrv->id_table, pdev))
136 /* Only accept driver_data values that match an existing id_table
140 while (ids->vendor || ids->subvendor || ids->class_mask) {
141 if (driver_data == ids->driver_data) {
147 if (retval) /* No match */
151 retval = pci_add_dynid(pdrv, vendor, device, subvendor, subdevice,
152 class, class_mask, driver_data);
157 static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
160 * store_remove_id - remove a PCI device ID from this driver
161 * @driver: target device driver
162 * @buf: buffer for scanning device ID data
165 * Removes a dynamic pci device ID to this driver.
167 static ssize_t store_remove_id(struct device_driver *driver, const char *buf,
170 struct pci_dynid *dynid, *n;
171 struct pci_driver *pdrv = to_pci_driver(driver);
172 __u32 vendor, device, subvendor = PCI_ANY_ID,
173 subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
175 int retval = -ENODEV;
177 fields = sscanf(buf, "%x %x %x %x %x %x",
178 &vendor, &device, &subvendor, &subdevice,
179 &class, &class_mask);
183 spin_lock(&pdrv->dynids.lock);
184 list_for_each_entry_safe(dynid, n, &pdrv->dynids.list, node) {
185 struct pci_device_id *id = &dynid->id;
186 if ((id->vendor == vendor) &&
187 (id->device == device) &&
188 (subvendor == PCI_ANY_ID || id->subvendor == subvendor) &&
189 (subdevice == PCI_ANY_ID || id->subdevice == subdevice) &&
190 !((id->class ^ class) & class_mask)) {
191 list_del(&dynid->node);
197 spin_unlock(&pdrv->dynids.lock);
203 static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
205 static struct attribute *pci_drv_attrs[] = {
206 &driver_attr_new_id.attr,
207 &driver_attr_remove_id.attr,
210 ATTRIBUTE_GROUPS(pci_drv);
213 * pci_match_id - See if a pci device matches a given pci_id table
214 * @ids: array of PCI device id structures to search in
215 * @dev: the PCI device structure to match against.
217 * Used by a driver to check whether a PCI device present in the
218 * system is in its list of supported devices. Returns the matching
219 * pci_device_id structure or %NULL if there is no match.
221 * Deprecated, don't use this as it will not catch any dynamic ids
222 * that a driver might want to check for.
224 const struct pci_device_id *pci_match_id(const struct pci_device_id *ids,
228 while (ids->vendor || ids->subvendor || ids->class_mask) {
229 if (pci_match_one_device(ids, dev))
236 EXPORT_SYMBOL(pci_match_id);
238 static const struct pci_device_id pci_device_id_any = {
239 .vendor = PCI_ANY_ID,
240 .device = PCI_ANY_ID,
241 .subvendor = PCI_ANY_ID,
242 .subdevice = PCI_ANY_ID,
246 * pci_match_device - Tell if a PCI device structure has a matching PCI device id structure
247 * @drv: the PCI driver to match against
248 * @dev: the PCI device structure to match against
250 * Used by a driver to check whether a PCI device present in the
251 * system is in its list of supported devices. Returns the matching
252 * pci_device_id structure or %NULL if there is no match.
254 static const struct pci_device_id *pci_match_device(struct pci_driver *drv,
257 struct pci_dynid *dynid;
258 const struct pci_device_id *found_id = NULL;
260 /* When driver_override is set, only bind to the matching driver */
261 if (dev->driver_override && strcmp(dev->driver_override, drv->name))
264 /* Look at the dynamic ids first, before the static ones */
265 spin_lock(&drv->dynids.lock);
266 list_for_each_entry(dynid, &drv->dynids.list, node) {
267 if (pci_match_one_device(&dynid->id, dev)) {
268 found_id = &dynid->id;
272 spin_unlock(&drv->dynids.lock);
275 found_id = pci_match_id(drv->id_table, dev);
277 /* driver_override will always match, send a dummy id */
278 if (!found_id && dev->driver_override)
279 found_id = &pci_device_id_any;
284 struct drv_dev_and_id {
285 struct pci_driver *drv;
287 const struct pci_device_id *id;
290 static long local_pci_probe(void *_ddi)
292 struct drv_dev_and_id *ddi = _ddi;
293 struct pci_dev *pci_dev = ddi->dev;
294 struct pci_driver *pci_drv = ddi->drv;
295 struct device *dev = &pci_dev->dev;
299 * Unbound PCI devices are always put in D0, regardless of
300 * runtime PM status. During probe, the device is set to
301 * active and the usage count is incremented. If the driver
302 * supports runtime PM, it should call pm_runtime_put_noidle()
303 * in its probe routine and pm_runtime_get_noresume() in its
306 pm_runtime_get_sync(dev);
307 pci_dev->driver = pci_drv;
308 rc = pci_drv->probe(pci_dev, ddi->id);
312 pci_dev->driver = NULL;
313 pm_runtime_put_sync(dev);
317 * Probe function should return < 0 for failure, 0 for success
318 * Treat values > 0 as success, but warn.
320 dev_warn(dev, "Driver probe function unexpectedly returned %d\n", rc);
324 static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
325 const struct pci_device_id *id)
328 struct drv_dev_and_id ddi = { drv, dev, id };
331 * Execute driver initialization on node where the device is
332 * attached. This way the driver likely allocates its local memory
335 node = dev_to_node(&dev->dev);
338 * On NUMA systems, we are likely to call a PF probe function using
339 * work_on_cpu(). If that probe calls pci_enable_sriov() (which
340 * adds the VF devices via pci_bus_add_device()), we may re-enter
341 * this function to call the VF probe function. Calling
342 * work_on_cpu() again will cause a lockdep warning. Since VFs are
343 * always on the same node as the PF, we can work around this by
344 * avoiding work_on_cpu() when we're already on the correct node.
346 * Preemption is enabled, so it's theoretically unsafe to use
347 * numa_node_id(), but even if we run the probe function on the
348 * wrong node, it should be functionally correct.
350 if (node >= 0 && node != numa_node_id()) {
354 cpu = cpumask_any_and(cpumask_of_node(node), cpu_online_mask);
355 if (cpu < nr_cpu_ids)
356 error = work_on_cpu(cpu, local_pci_probe, &ddi);
358 error = local_pci_probe(&ddi);
361 error = local_pci_probe(&ddi);
367 * __pci_device_probe - check if a driver wants to claim a specific PCI device
368 * @drv: driver to call to check if it wants the PCI device
369 * @pci_dev: PCI device being probed
371 * returns 0 on success, else error.
372 * side-effect: pci_dev->driver is set to drv when drv claims pci_dev.
374 static int __pci_device_probe(struct pci_driver *drv, struct pci_dev *pci_dev)
376 const struct pci_device_id *id;
379 if (!pci_dev->driver && drv->probe) {
382 id = pci_match_device(drv, pci_dev);
384 error = pci_call_probe(drv, pci_dev, id);
391 static int pci_device_probe(struct device *dev)
394 struct pci_driver *drv;
395 struct pci_dev *pci_dev;
397 drv = to_pci_driver(dev->driver);
398 pci_dev = to_pci_dev(dev);
399 pci_dev_get(pci_dev);
400 error = __pci_device_probe(drv, pci_dev);
402 pci_dev_put(pci_dev);
407 static int pci_device_remove(struct device *dev)
409 struct pci_dev *pci_dev = to_pci_dev(dev);
410 struct pci_driver *drv = pci_dev->driver;
414 pm_runtime_get_sync(dev);
415 drv->remove(pci_dev);
416 pm_runtime_put_noidle(dev);
418 pci_dev->driver = NULL;
421 /* Undo the runtime PM settings in local_pci_probe() */
422 pm_runtime_put_sync(dev);
425 * If the device is still on, set the power state as "unknown",
426 * since it might change by the next time we load the driver.
428 if (pci_dev->current_state == PCI_D0)
429 pci_dev->current_state = PCI_UNKNOWN;
432 * We would love to complain here if pci_dev->is_enabled is set, that
433 * the driver should have called pci_disable_device(), but the
434 * unfortunate fact is there are too many odd BIOS and bridge setups
435 * that don't like drivers doing that all of the time.
436 * Oh well, we can dream of sane hardware when we sleep, no matter how
437 * horrible the crap we have to deal with is when we are awake...
440 pci_dev_put(pci_dev);
444 static void pci_device_shutdown(struct device *dev)
446 struct pci_dev *pci_dev = to_pci_dev(dev);
447 struct pci_driver *drv = pci_dev->driver;
449 pm_runtime_resume(dev);
451 if (drv && drv->shutdown)
452 drv->shutdown(pci_dev);
453 pci_msi_shutdown(pci_dev);
454 pci_msix_shutdown(pci_dev);
458 * If this is a kexec reboot, turn off Bus Master bit on the
459 * device to tell it to not continue to do DMA. Don't touch
460 * devices in D3cold or unknown states.
461 * If it is not a kexec reboot, firmware will hit the PCI
462 * devices with big hammer and stop their DMA any way.
464 if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot))
465 pci_clear_master(pci_dev);
471 /* Auxiliary functions used for system resume and run-time resume. */
474 * pci_restore_standard_config - restore standard config registers of PCI device
475 * @pci_dev: PCI device to handle
477 static int pci_restore_standard_config(struct pci_dev *pci_dev)
479 pci_update_current_state(pci_dev, PCI_UNKNOWN);
481 if (pci_dev->current_state != PCI_D0) {
482 int error = pci_set_power_state(pci_dev, PCI_D0);
487 pci_restore_state(pci_dev);
493 #ifdef CONFIG_PM_SLEEP
495 static void pci_pm_default_resume_early(struct pci_dev *pci_dev)
497 pci_power_up(pci_dev);
498 pci_restore_state(pci_dev);
499 pci_fixup_device(pci_fixup_resume_early, pci_dev);
503 * Default "suspend" method for devices that have no driver provided suspend,
504 * or not even a driver at all (second part).
506 static void pci_pm_set_unknown_state(struct pci_dev *pci_dev)
509 * mark its power state as "unknown", since we don't know if
510 * e.g. the BIOS will change its device state when we suspend.
512 if (pci_dev->current_state == PCI_D0)
513 pci_dev->current_state = PCI_UNKNOWN;
517 * Default "resume" method for devices that have no driver provided resume,
518 * or not even a driver at all (second part).
520 static int pci_pm_reenable_device(struct pci_dev *pci_dev)
524 /* if the device was enabled before suspend, reenable */
525 retval = pci_reenable_device(pci_dev);
527 * if the device was busmaster before the suspend, make it busmaster
530 if (pci_dev->is_busmaster)
531 pci_set_master(pci_dev);
536 static int pci_legacy_suspend(struct device *dev, pm_message_t state)
538 struct pci_dev *pci_dev = to_pci_dev(dev);
539 struct pci_driver *drv = pci_dev->driver;
541 if (drv && drv->suspend) {
542 pci_power_t prev = pci_dev->current_state;
545 error = drv->suspend(pci_dev, state);
546 suspend_report_result(drv->suspend, error);
550 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
551 && pci_dev->current_state != PCI_UNKNOWN) {
552 WARN_ONCE(pci_dev->current_state != prev,
553 "PCI PM: Device state not saved by %pF\n",
558 pci_fixup_device(pci_fixup_suspend, pci_dev);
563 static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
565 struct pci_dev *pci_dev = to_pci_dev(dev);
566 struct pci_driver *drv = pci_dev->driver;
568 if (drv && drv->suspend_late) {
569 pci_power_t prev = pci_dev->current_state;
572 error = drv->suspend_late(pci_dev, state);
573 suspend_report_result(drv->suspend_late, error);
577 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
578 && pci_dev->current_state != PCI_UNKNOWN) {
579 WARN_ONCE(pci_dev->current_state != prev,
580 "PCI PM: Device state not saved by %pF\n",
586 if (!pci_dev->state_saved)
587 pci_save_state(pci_dev);
589 pci_pm_set_unknown_state(pci_dev);
592 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
597 static int pci_legacy_resume_early(struct device *dev)
599 struct pci_dev *pci_dev = to_pci_dev(dev);
600 struct pci_driver *drv = pci_dev->driver;
602 return drv && drv->resume_early ?
603 drv->resume_early(pci_dev) : 0;
606 static int pci_legacy_resume(struct device *dev)
608 struct pci_dev *pci_dev = to_pci_dev(dev);
609 struct pci_driver *drv = pci_dev->driver;
611 pci_fixup_device(pci_fixup_resume, pci_dev);
613 return drv && drv->resume ?
614 drv->resume(pci_dev) : pci_pm_reenable_device(pci_dev);
617 /* Auxiliary functions used by the new power management framework */
619 static void pci_pm_default_resume(struct pci_dev *pci_dev)
621 pci_fixup_device(pci_fixup_resume, pci_dev);
623 if (!pci_has_subordinate(pci_dev))
624 pci_enable_wake(pci_dev, PCI_D0, false);
627 static void pci_pm_default_suspend(struct pci_dev *pci_dev)
629 /* Disable non-bridge devices without PM support */
630 if (!pci_has_subordinate(pci_dev))
631 pci_disable_enabled_device(pci_dev);
634 static bool pci_has_legacy_pm_support(struct pci_dev *pci_dev)
636 struct pci_driver *drv = pci_dev->driver;
637 bool ret = drv && (drv->suspend || drv->suspend_late || drv->resume
638 || drv->resume_early);
641 * Legacy PM support is used by default, so warn if the new framework is
642 * supported as well. Drivers are supposed to support either the
643 * former, or the latter, but not both at the same time.
645 WARN(ret && drv->driver.pm, "driver %s device %04x:%04x\n",
646 drv->name, pci_dev->vendor, pci_dev->device);
651 /* New power management framework */
653 static int pci_pm_prepare(struct device *dev)
655 struct device_driver *drv = dev->driver;
659 * Devices having power.ignore_children set may still be necessary for
660 * suspending their children in the next phase of device suspend.
662 if (dev->power.ignore_children)
663 pm_runtime_resume(dev);
665 if (drv && drv->pm && drv->pm->prepare)
666 error = drv->pm->prepare(dev);
672 #else /* !CONFIG_PM_SLEEP */
674 #define pci_pm_prepare NULL
676 #endif /* !CONFIG_PM_SLEEP */
678 #ifdef CONFIG_SUSPEND
680 static int pci_pm_suspend(struct device *dev)
682 struct pci_dev *pci_dev = to_pci_dev(dev);
683 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
685 if (pci_has_legacy_pm_support(pci_dev))
686 return pci_legacy_suspend(dev, PMSG_SUSPEND);
689 pci_pm_default_suspend(pci_dev);
694 * PCI devices suspended at run time need to be resumed at this point,
695 * because in general it is necessary to reconfigure them for system
696 * suspend. Namely, if the device is supposed to wake up the system
697 * from the sleep state, we may need to reconfigure it for this purpose.
698 * In turn, if the device is not supposed to wake up the system from the
699 * sleep state, we'll have to prevent it from signaling wake-up.
701 pm_runtime_resume(dev);
703 pci_dev->state_saved = false;
705 pci_power_t prev = pci_dev->current_state;
708 error = pm->suspend(dev);
709 suspend_report_result(pm->suspend, error);
713 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
714 && pci_dev->current_state != PCI_UNKNOWN) {
715 WARN_ONCE(pci_dev->current_state != prev,
716 "PCI PM: State of device not saved by %pF\n",
722 pci_fixup_device(pci_fixup_suspend, pci_dev);
727 static int pci_pm_suspend_noirq(struct device *dev)
729 struct pci_dev *pci_dev = to_pci_dev(dev);
730 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
732 if (pci_has_legacy_pm_support(pci_dev))
733 return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
736 pci_save_state(pci_dev);
740 if (pm->suspend_noirq) {
741 pci_power_t prev = pci_dev->current_state;
744 error = pm->suspend_noirq(dev);
745 suspend_report_result(pm->suspend_noirq, error);
749 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
750 && pci_dev->current_state != PCI_UNKNOWN) {
751 WARN_ONCE(pci_dev->current_state != prev,
752 "PCI PM: State of device not saved by %pF\n",
758 if (!pci_dev->state_saved) {
759 pci_save_state(pci_dev);
760 if (!pci_has_subordinate(pci_dev))
761 pci_prepare_to_sleep(pci_dev);
764 pci_pm_set_unknown_state(pci_dev);
767 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
768 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
769 * hasn't been quiesced and tries to turn it off. If the controller
770 * is already in D3, this can hang or cause memory corruption.
772 * Since the value of the COMMAND register doesn't matter once the
773 * device has been suspended, we can safely set it to 0 here.
775 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
776 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
779 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
784 static int pci_pm_resume_noirq(struct device *dev)
786 struct pci_dev *pci_dev = to_pci_dev(dev);
787 struct device_driver *drv = dev->driver;
790 pci_pm_default_resume_early(pci_dev);
792 if (pci_has_legacy_pm_support(pci_dev))
793 return pci_legacy_resume_early(dev);
795 if (drv && drv->pm && drv->pm->resume_noirq)
796 error = drv->pm->resume_noirq(dev);
801 static int pci_pm_resume(struct device *dev)
803 struct pci_dev *pci_dev = to_pci_dev(dev);
804 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
808 * This is necessary for the suspend error path in which resume is
809 * called without restoring the standard config registers of the device.
811 if (pci_dev->state_saved)
812 pci_restore_standard_config(pci_dev);
814 if (pci_has_legacy_pm_support(pci_dev))
815 return pci_legacy_resume(dev);
817 pci_pm_default_resume(pci_dev);
821 error = pm->resume(dev);
823 pci_pm_reenable_device(pci_dev);
829 #else /* !CONFIG_SUSPEND */
831 #define pci_pm_suspend NULL
832 #define pci_pm_suspend_noirq NULL
833 #define pci_pm_resume NULL
834 #define pci_pm_resume_noirq NULL
836 #endif /* !CONFIG_SUSPEND */
838 #ifdef CONFIG_HIBERNATE_CALLBACKS
842 * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
843 * a hibernate transition
845 struct dev_pm_ops __weak pcibios_pm_ops;
847 static int pci_pm_freeze(struct device *dev)
849 struct pci_dev *pci_dev = to_pci_dev(dev);
850 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
852 if (pci_has_legacy_pm_support(pci_dev))
853 return pci_legacy_suspend(dev, PMSG_FREEZE);
856 pci_pm_default_suspend(pci_dev);
861 * This used to be done in pci_pm_prepare() for all devices and some
862 * drivers may depend on it, so do it here. Ideally, runtime-suspended
863 * devices should not be touched during freeze/thaw transitions,
866 pm_runtime_resume(dev);
868 pci_dev->state_saved = false;
872 error = pm->freeze(dev);
873 suspend_report_result(pm->freeze, error);
878 if (pcibios_pm_ops.freeze)
879 return pcibios_pm_ops.freeze(dev);
884 static int pci_pm_freeze_noirq(struct device *dev)
886 struct pci_dev *pci_dev = to_pci_dev(dev);
887 struct device_driver *drv = dev->driver;
889 if (pci_has_legacy_pm_support(pci_dev))
890 return pci_legacy_suspend_late(dev, PMSG_FREEZE);
892 if (drv && drv->pm && drv->pm->freeze_noirq) {
895 error = drv->pm->freeze_noirq(dev);
896 suspend_report_result(drv->pm->freeze_noirq, error);
901 if (!pci_dev->state_saved)
902 pci_save_state(pci_dev);
904 pci_pm_set_unknown_state(pci_dev);
906 if (pcibios_pm_ops.freeze_noirq)
907 return pcibios_pm_ops.freeze_noirq(dev);
912 static int pci_pm_thaw_noirq(struct device *dev)
914 struct pci_dev *pci_dev = to_pci_dev(dev);
915 struct device_driver *drv = dev->driver;
918 if (pcibios_pm_ops.thaw_noirq) {
919 error = pcibios_pm_ops.thaw_noirq(dev);
924 if (pci_has_legacy_pm_support(pci_dev))
925 return pci_legacy_resume_early(dev);
927 pci_update_current_state(pci_dev, PCI_D0);
929 if (drv && drv->pm && drv->pm->thaw_noirq)
930 error = drv->pm->thaw_noirq(dev);
935 static int pci_pm_thaw(struct device *dev)
937 struct pci_dev *pci_dev = to_pci_dev(dev);
938 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
941 if (pcibios_pm_ops.thaw) {
942 error = pcibios_pm_ops.thaw(dev);
947 if (pci_has_legacy_pm_support(pci_dev))
948 return pci_legacy_resume(dev);
952 error = pm->thaw(dev);
954 pci_pm_reenable_device(pci_dev);
957 pci_dev->state_saved = false;
962 static int pci_pm_poweroff(struct device *dev)
964 struct pci_dev *pci_dev = to_pci_dev(dev);
965 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
967 if (pci_has_legacy_pm_support(pci_dev))
968 return pci_legacy_suspend(dev, PMSG_HIBERNATE);
971 pci_pm_default_suspend(pci_dev);
975 /* The reason to do that is the same as in pci_pm_suspend(). */
976 pm_runtime_resume(dev);
978 pci_dev->state_saved = false;
982 error = pm->poweroff(dev);
983 suspend_report_result(pm->poweroff, error);
989 pci_fixup_device(pci_fixup_suspend, pci_dev);
991 if (pcibios_pm_ops.poweroff)
992 return pcibios_pm_ops.poweroff(dev);
997 static int pci_pm_poweroff_noirq(struct device *dev)
999 struct pci_dev *pci_dev = to_pci_dev(dev);
1000 struct device_driver *drv = dev->driver;
1002 if (pci_has_legacy_pm_support(to_pci_dev(dev)))
1003 return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
1005 if (!drv || !drv->pm) {
1006 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1010 if (drv->pm->poweroff_noirq) {
1013 error = drv->pm->poweroff_noirq(dev);
1014 suspend_report_result(drv->pm->poweroff_noirq, error);
1019 if (!pci_dev->state_saved && !pci_has_subordinate(pci_dev))
1020 pci_prepare_to_sleep(pci_dev);
1023 * The reason for doing this here is the same as for the analogous code
1024 * in pci_pm_suspend_noirq().
1026 if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
1027 pci_write_config_word(pci_dev, PCI_COMMAND, 0);
1029 pci_fixup_device(pci_fixup_suspend_late, pci_dev);
1031 if (pcibios_pm_ops.poweroff_noirq)
1032 return pcibios_pm_ops.poweroff_noirq(dev);
1037 static int pci_pm_restore_noirq(struct device *dev)
1039 struct pci_dev *pci_dev = to_pci_dev(dev);
1040 struct device_driver *drv = dev->driver;
1043 if (pcibios_pm_ops.restore_noirq) {
1044 error = pcibios_pm_ops.restore_noirq(dev);
1049 pci_pm_default_resume_early(pci_dev);
1051 if (pci_has_legacy_pm_support(pci_dev))
1052 return pci_legacy_resume_early(dev);
1054 if (drv && drv->pm && drv->pm->restore_noirq)
1055 error = drv->pm->restore_noirq(dev);
1060 static int pci_pm_restore(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 (pcibios_pm_ops.restore) {
1067 error = pcibios_pm_ops.restore(dev);
1073 * This is necessary for the hibernation error path in which restore is
1074 * called without restoring the standard config registers of the device.
1076 if (pci_dev->state_saved)
1077 pci_restore_standard_config(pci_dev);
1079 if (pci_has_legacy_pm_support(pci_dev))
1080 return pci_legacy_resume(dev);
1082 pci_pm_default_resume(pci_dev);
1086 error = pm->restore(dev);
1088 pci_pm_reenable_device(pci_dev);
1094 #else /* !CONFIG_HIBERNATE_CALLBACKS */
1096 #define pci_pm_freeze NULL
1097 #define pci_pm_freeze_noirq NULL
1098 #define pci_pm_thaw NULL
1099 #define pci_pm_thaw_noirq NULL
1100 #define pci_pm_poweroff NULL
1101 #define pci_pm_poweroff_noirq NULL
1102 #define pci_pm_restore NULL
1103 #define pci_pm_restore_noirq NULL
1105 #endif /* !CONFIG_HIBERNATE_CALLBACKS */
1109 static int pci_pm_runtime_suspend(struct device *dev)
1111 struct pci_dev *pci_dev = to_pci_dev(dev);
1112 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1113 pci_power_t prev = pci_dev->current_state;
1117 * If pci_dev->driver is not set (unbound), the device should
1118 * always remain in D0 regardless of the runtime PM status
1120 if (!pci_dev->driver)
1123 if (!pm || !pm->runtime_suspend)
1126 pci_dev->state_saved = false;
1127 pci_dev->no_d3cold = false;
1128 error = pm->runtime_suspend(dev);
1129 suspend_report_result(pm->runtime_suspend, error);
1132 if (!pci_dev->d3cold_allowed)
1133 pci_dev->no_d3cold = true;
1135 pci_fixup_device(pci_fixup_suspend, pci_dev);
1137 if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
1138 && pci_dev->current_state != PCI_UNKNOWN) {
1139 WARN_ONCE(pci_dev->current_state != prev,
1140 "PCI PM: State of device not saved by %pF\n",
1141 pm->runtime_suspend);
1145 if (!pci_dev->state_saved) {
1146 pci_save_state(pci_dev);
1147 pci_finish_runtime_suspend(pci_dev);
1153 static int pci_pm_runtime_resume(struct device *dev)
1156 struct pci_dev *pci_dev = to_pci_dev(dev);
1157 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1160 * If pci_dev->driver is not set (unbound), the device should
1161 * always remain in D0 regardless of the runtime PM status
1163 if (!pci_dev->driver)
1166 if (!pm || !pm->runtime_resume)
1169 pci_restore_standard_config(pci_dev);
1170 pci_fixup_device(pci_fixup_resume_early, pci_dev);
1171 __pci_enable_wake(pci_dev, PCI_D0, true, false);
1172 pci_fixup_device(pci_fixup_resume, pci_dev);
1174 rc = pm->runtime_resume(dev);
1176 pci_dev->runtime_d3cold = false;
1181 static int pci_pm_runtime_idle(struct device *dev)
1183 struct pci_dev *pci_dev = to_pci_dev(dev);
1184 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1188 * If pci_dev->driver is not set (unbound), the device should
1189 * always remain in D0 regardless of the runtime PM status
1191 if (!pci_dev->driver)
1197 if (pm->runtime_idle)
1198 ret = pm->runtime_idle(dev);
1203 static const struct dev_pm_ops pci_dev_pm_ops = {
1204 .prepare = pci_pm_prepare,
1205 .suspend = pci_pm_suspend,
1206 .resume = pci_pm_resume,
1207 .freeze = pci_pm_freeze,
1208 .thaw = pci_pm_thaw,
1209 .poweroff = pci_pm_poweroff,
1210 .restore = pci_pm_restore,
1211 .suspend_noirq = pci_pm_suspend_noirq,
1212 .resume_noirq = pci_pm_resume_noirq,
1213 .freeze_noirq = pci_pm_freeze_noirq,
1214 .thaw_noirq = pci_pm_thaw_noirq,
1215 .poweroff_noirq = pci_pm_poweroff_noirq,
1216 .restore_noirq = pci_pm_restore_noirq,
1217 .runtime_suspend = pci_pm_runtime_suspend,
1218 .runtime_resume = pci_pm_runtime_resume,
1219 .runtime_idle = pci_pm_runtime_idle,
1222 #define PCI_PM_OPS_PTR (&pci_dev_pm_ops)
1224 #else /* !CONFIG_PM */
1226 #define pci_pm_runtime_suspend NULL
1227 #define pci_pm_runtime_resume NULL
1228 #define pci_pm_runtime_idle NULL
1230 #define PCI_PM_OPS_PTR NULL
1232 #endif /* !CONFIG_PM */
1235 * __pci_register_driver - register a new pci driver
1236 * @drv: the driver structure to register
1237 * @owner: owner module of drv
1238 * @mod_name: module name string
1240 * Adds the driver structure to the list of registered drivers.
1241 * Returns a negative value on error, otherwise 0.
1242 * If no error occurred, the driver remains registered even if
1243 * no device was claimed during registration.
1245 int __pci_register_driver(struct pci_driver *drv, struct module *owner,
1246 const char *mod_name)
1248 /* initialize common driver fields */
1249 drv->driver.name = drv->name;
1250 drv->driver.bus = &pci_bus_type;
1251 drv->driver.owner = owner;
1252 drv->driver.mod_name = mod_name;
1254 spin_lock_init(&drv->dynids.lock);
1255 INIT_LIST_HEAD(&drv->dynids.list);
1257 /* register with core */
1258 return driver_register(&drv->driver);
1260 EXPORT_SYMBOL(__pci_register_driver);
1263 * pci_unregister_driver - unregister a pci driver
1264 * @drv: the driver structure to unregister
1266 * Deletes the driver structure from the list of registered PCI drivers,
1267 * gives it a chance to clean up by calling its remove() function for
1268 * each device it was responsible for, and marks those devices as
1272 void pci_unregister_driver(struct pci_driver *drv)
1274 driver_unregister(&drv->driver);
1275 pci_free_dynids(drv);
1277 EXPORT_SYMBOL(pci_unregister_driver);
1279 static struct pci_driver pci_compat_driver = {
1284 * pci_dev_driver - get the pci_driver of a device
1285 * @dev: the device to query
1287 * Returns the appropriate pci_driver structure or %NULL if there is no
1288 * registered driver for the device.
1290 struct pci_driver *pci_dev_driver(const struct pci_dev *dev)
1296 for (i = 0; i <= PCI_ROM_RESOURCE; i++)
1297 if (dev->resource[i].flags & IORESOURCE_BUSY)
1298 return &pci_compat_driver;
1302 EXPORT_SYMBOL(pci_dev_driver);
1305 * pci_bus_match - Tell if a PCI device structure has a matching PCI device id structure
1306 * @dev: the PCI device structure to match against
1307 * @drv: the device driver to search for matching PCI device id structures
1309 * Used by a driver to check whether a PCI device present in the
1310 * system is in its list of supported devices. Returns the matching
1311 * pci_device_id structure or %NULL if there is no match.
1313 static int pci_bus_match(struct device *dev, struct device_driver *drv)
1315 struct pci_dev *pci_dev = to_pci_dev(dev);
1316 struct pci_driver *pci_drv;
1317 const struct pci_device_id *found_id;
1319 if (!pci_dev->match_driver)
1322 pci_drv = to_pci_driver(drv);
1323 found_id = pci_match_device(pci_drv, pci_dev);
1331 * pci_dev_get - increments the reference count of the pci device structure
1332 * @dev: the device being referenced
1334 * Each live reference to a device should be refcounted.
1336 * Drivers for PCI devices should normally record such references in
1337 * their probe() methods, when they bind to a device, and release
1338 * them by calling pci_dev_put(), in their disconnect() methods.
1340 * A pointer to the device with the incremented reference counter is returned.
1342 struct pci_dev *pci_dev_get(struct pci_dev *dev)
1345 get_device(&dev->dev);
1348 EXPORT_SYMBOL(pci_dev_get);
1351 * pci_dev_put - release a use of the pci device structure
1352 * @dev: device that's been disconnected
1354 * Must be called when a user of a device is finished with it. When the last
1355 * user of the device calls this function, the memory of the device is freed.
1357 void pci_dev_put(struct pci_dev *dev)
1360 put_device(&dev->dev);
1362 EXPORT_SYMBOL(pci_dev_put);
1364 static int pci_uevent(struct device *dev, struct kobj_uevent_env *env)
1366 struct pci_dev *pdev;
1371 pdev = to_pci_dev(dev);
1373 if (add_uevent_var(env, "PCI_CLASS=%04X", pdev->class))
1376 if (add_uevent_var(env, "PCI_ID=%04X:%04X", pdev->vendor, pdev->device))
1379 if (add_uevent_var(env, "PCI_SUBSYS_ID=%04X:%04X", pdev->subsystem_vendor,
1380 pdev->subsystem_device))
1383 if (add_uevent_var(env, "PCI_SLOT_NAME=%s", pci_name(pdev)))
1386 if (add_uevent_var(env, "MODALIAS=pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",
1387 pdev->vendor, pdev->device,
1388 pdev->subsystem_vendor, pdev->subsystem_device,
1389 (u8)(pdev->class >> 16), (u8)(pdev->class >> 8),
1396 struct bus_type pci_bus_type = {
1398 .match = pci_bus_match,
1399 .uevent = pci_uevent,
1400 .probe = pci_device_probe,
1401 .remove = pci_device_remove,
1402 .shutdown = pci_device_shutdown,
1403 .dev_groups = pci_dev_groups,
1404 .bus_groups = pci_bus_groups,
1405 .drv_groups = pci_drv_groups,
1406 .pm = PCI_PM_OPS_PTR,
1408 EXPORT_SYMBOL(pci_bus_type);
1410 static int __init pci_driver_init(void)
1412 return bus_register(&pci_bus_type);
1414 postcore_initcall(pci_driver_init);